CN103674207B - Flexible element and body weigher - Google Patents
Flexible element and body weigher Download PDFInfo
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- CN103674207B CN103674207B CN201310447691.5A CN201310447691A CN103674207B CN 103674207 B CN103674207 B CN 103674207B CN 201310447691 A CN201310447691 A CN 201310447691A CN 103674207 B CN103674207 B CN 103674207B
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- VYZAMTAEIAYCRO-UHFFFAOYSA-N chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 8
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- DIMMBYOINZRKMD-UHFFFAOYSA-N vanadium(5+) Chemical compound [V+5] DIMMBYOINZRKMD-UHFFFAOYSA-N 0.000 claims description 4
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Abstract
A kind of flexible element for load transducer, this flexible element is formed by powder metallurgy.Described flexible element has axisymmetric shape and includes rectangle strain region, two the first arms, the first connecting portion, two the second arms and the second connecting portion, described first connecting portion is connected to described first arm and the one end in described strain region, and described second connecting portion is connected to described second arm and the other end in described strain region.In a pair first arms and a pair second arms a pair is by along being perpendicular to the load on the direction of described flexible element, and another in a pair first arms and a pair second arms is to being fixed on supporter.
Description
Technical field
The present invention relates to a kind of flexible element, this flexible element is in load transducer, to measure body weight, and
And this flexible element deforms, moreover, it relates to one includes institute by being delivered to load thereon
State the body weigher of flexible element.
Background technology
Such as, body weigher (such as scale) includes at least one load transducer, is applied to put down
Load on platform is delivered on load transducer.Load transducer includes the flexible element deformed by load
With the multiple foil gauges (strain gauges) being connected to flexible element.Japan Patent No.2977278 is open
This flexible element.
Flexible element is formed by the material of high intensity, and generally by reaching high production in large-scale production
Power be stamped to form type.But, the width of the part to be punched owing to being stamped needs equal to or more than thickness
Degree, therefore limits the increase of the size of flexible element to be processed.Additionally, it is difficult to formed such as small-gap suture etc.
Complicated shape.In order to reduce the size of flexible element will pass through stamped or to form complicated shape, can
Consider to make flexible element thinning or flexible element is made up of low intensive metal material, but in these cases, scratch
Property part mechanical strength be deteriorated.If additionally, flexible element is made up of the metal material of high intensity, then punching
Pressure can produce on stamping surface and shear sagging, the surface of fracture and burr.Have therefore, it is difficult to formed
The thickness of high-precision flexible element and width.To this end, the weight measurement precision of load transducer is restricted.
Summary of the invention
So, the present invention provides a kind of flexible element, and this flexible element has the size of reduction, it is ensured that machinery
Intensity, and there is in terms of thickness and width high dimensional accuracy, the present invention also provides for one and includes institute
State the body weigher of flexible element.
The present invention provides a kind of flexible element, and this flexible element is used in the load transducer measuring body weight, passes through
It is delivered to the load on described flexible element and deforms, and be made up of powder metallurgy.According to the present invention,
Owing to described flexible element is made up of powder metallurgy, the size of the most described flexible element can reduce and can
To ensure the mechanical strength of described flexible element.Additionally, due to the thickness of described flexible element and the size of width
Precision is high, therefore improves the measured body weight precision of described load transducer.
According to embodiment, described flexible element is used in the load transducer measuring body weight, described flexible element
Deforming by being delivered to load thereon, described flexible element is made up of powder metallurgy, and described in scratch
Property part has the axisymmetric shape about the axis of symmetry and uniform thickness.Described flexible element includes: rectangle
Strain region, this rectangle strain region is arranged on the center of described flexible element, along identical with its axis of symmetry
Direction extend, and described rectangle strain region there is the first end and the second end；Two the first arms,
These two first arms are parallel to the described axis of symmetry and extend；First connecting portion, this first connecting portion is along just
The direction handing over the described axis of symmetry extends, and described first connecting portion is connected to described first arm and institute
State first end in strain region；Two the second arms, these two second arms are set to than described first arm
Portion is closer to described strain region, and said two the second arm is parallel to the described axis of symmetry and extends；
And second connecting portion, described second connecting portion extends along the direction of the orthogonal described axis of symmetry, and institute
State the second connecting portion and be connected to described second arm and second end in described strain region, wherein, a pair
In one arm and a pair second arms a pair is perpendicular to the load on described flexible element direction by edge, and
And another in a pair first arms and a pair second arms is to being fixed on supporter, and, wherein said
Between gap and described second arm and described strain region between first arm and described second arm
Gap equal to or less than the half of thickness of described flexible element.
In said embodiment, the gap between described first arm and described second arm and described the
Gap between two arms and described strain region is equal to or less than the half of the thickness of described flexible element.By
It is set to the least in this gap, therefore can reduce the size of described flexible element.Scratch described in being suitable for
Property part the metal material of high intensity, when using punching press, this gap it may be only configured to and described flexibility
The thickness of part is identical and can not be thinner than the thickness of described flexible element.But, when using powder metallurgy,
This gap can the size of thinning and described flexible element can reduce.In said embodiment, may be used
To obtain described flexible element by compressing and sintering metal powder, or obtained by metal injection molded
Obtain described flexible element.It is, in said embodiment, as by the method for powder metallurgy, golden
Belonging to powder can be compressing and sinter, or can use metal injection molded.
According to another embodiment of the present invention, described flexible element is for measuring the load transducer of body weight
In, described flexible element deforms by being delivered to load thereon, described flexible element by compressing also
And sintering at least includes vanadium (V) and chromium (Cr) and mainly includes that the metal dust of ferrum (Fe) obtains,
And described flexible element has the axisymmetric shape about the axis of symmetry, described flexible element includes: rectangle should
Becoming region, this rectangle strain region is arranged on the central authorities of described flexible element, identical with the described axis of symmetry
Side upwardly extend, and have the first end and second end；Two the first arms, these two first arms
It is parallel to the described axis of symmetry extend；First connecting portion, this first connecting portion is at the orthogonal described axis of symmetry
Side upwardly extend and be connected to described first arm and first end in described strain region；Two second
Arm, these two second arms are set to than described first arm closer to described strain region, and put down
Row extends in the described axis of symmetry；And second connecting portion, this second connecting portion is at orthogonal described axis of symmetry
The side of line upwardly extends and is connected to described second arm and second end in described strain region, wherein,
In a pair first arms and a pair second arms a pair is by along being perpendicular on the direction of described flexible element
Load, and another in a pair first arms and a pair second arms is to being fixed on supporter.
In said embodiment, at least can be wrapped by compressing and sintering due to described flexible element
Include vanadium (V) and chromium (Cr) and mainly include that the metal dust of ferrum (Fe) obtains, there is complex shape
The described flexible element of shape can reduce size and can ensure that its mechanical strength.
Preferably, each first arm length on the direction of the axis of symmetry being perpendicular to described flexible element
For 1.3 times of described strain region length on the direction of the axis of symmetry of orthogonal described flexible element or more
Many.Preferably, each first arm is provided with the first through hole, and can be by using described through hole spiral shell
Tether and be connected to miscellaneous part.When described gap between two side surfaces of each first arm is big, energy
Enough reduce the residual stress caused on described first arm by the screw-down torque produced when tightening described screw.
Owing to the measured body weight precision of described load transducer is adversely affected by described residual stress, it is generally desirable to
Described residual stress is little.When each first arm is in the axis of symmetry direction being perpendicular to described flexible element
On a length of described strain region length on the direction of the axis of symmetry of orthogonal described flexible element
When 1.3 times or more, described residual stress reduces, and therefore can improve the body weight of described body weight sensor
Certainty of measurement.
Preferably, described first connecting portion length on the direction of the axis of symmetry being parallel to described flexible element
Degree for 1.4 times of described strain region length on the direction of the axis of symmetry of orthogonal described flexible element or
More.Preferably, each first arm is provided with the first through hole, and can be by using described through hole
Bolt is connected to miscellaneous part.When described first connecting portion is on the direction being parallel to the described axis of symmetry
When length is big, it is possible to reduce and caused by the screw-down torque produced when tightening described screw on described first arm
Residual stress.Owing to described residual stress has unfavorable shadow to the measured body weight precision of described load transducer
Ring, it is generally desirable to described residual stress is little.When described first connecting portion is being parallel to described flexible element
The axis of symmetry direction on a length of described strain region at the axis of symmetry of orthogonal described flexible element
Direction on 1.4 times or more of length time, described residual stress reduces, and therefore can improve described
The measured body weight precision of body weight sensor.
Each second arm can be provided with the second through hole.
According to the body weigher of other embodiment, this body weigher includes described flexible element
And load transducer, this load transducer includes multiple foil gauge, and this foil gauge is connected to described flexible element
And produce the signal of deformation in response to described flexible element.
Accompanying drawing explanation
From description subsequently, in conjunction with accompanying drawing, the flexible element of the present invention and other spy of body weigher
Advantage of seeking peace will be apparent from.Wherein:
Fig. 1 is to show the body weigher according to the embodiment of the present invention when tilting to see from upside
Axonometric chart；
Fig. 2 is the axonometric chart of the body weigher shown in Fig. 1 when in terms of downside；
Fig. 3 is the top view of the body weigher in Fig. 1；
Fig. 4 is the top view showing the load transducer assembly within the body weigher in Fig. 1；
Fig. 5 is the axonometric chart of the load transducer assembly taken apart；
Fig. 6 is the top view of the load-transmitting element showing described load transducer component internal；
Fig. 7 is to show the axonometric chart of load-transmitting element when in terms of downside；
Fig. 8 is to show the axonometric chart of the flexible element of load transducer component internal when seeing from upside inclination；
Fig. 9 is the upward view showing flexible element；
Figure 10 is the upward view showing load-transmitting element and the flexible element being interconnected with one another；
Figure 11 is the top view showing flexible element and the tie-beam being interconnected with one another；
Figure 12 is the top view showing tie-beam；
Figure 13 is the side view showing flexible element and the tie-beam being interconnected with one another in Figure 11；
Figure 14 is the top view of the elastic supporting member for supporting optical member showing supporting leg and load transducer component internal；
Figure 15 is the axonometric chart showing supporting leg and elastic supporting member for supporting optical member；
Figure 16 is the top view showing elastic supporting member for supporting optical member；
Figure 17 is the top view showing supporting leg；
Figure 18 is the upward view showing supporting leg；
Figure 19 is the front view showing supporting leg；
Figure 20 is the side view showing supporting leg；
Figure 21 is the side view of the load transducer showing load transducer component internal；
Figure 22 is the sectional view of XXII-XXII line cutting along Fig. 3；
Figure 23 be show the ruggedness by the research hardness of elastic supporting member for supporting optical member and load transducer assembly it
Between the form of experimental result that obtains of relation；
Figure 24 is to show that the relation between hardness and measured body weight error by research elastic supporting member for supporting optical member obtains
The curve chart of the experimental result arrived；
Figure 25 produces the schematic diagram of the pressure distribution at flexible element during being shown in measured body weight；
Figure 26 is the axonometric chart of the carpet supporting leg showing and may be connected to supporting leg；
Figure 27 is the sectional view showing the body weigher according to another embodiment；
Figure 28 is to show that the relation between size and measured body weight error by research flexible element obtains
The curve chart of result；
Figure 29 is to show that the relation between size and measured body weight error by research flexible element obtains
The curve chart of result；And
Figure 30 is to show that the relation between size and measured body weight error by research flexible element obtains
The curve chart of result.
Detailed description of the invention
Hereinafter, the detailed description of the invention according to the present invention will be described with reference to the drawings.Fig. 1 and Fig. 2 shows
Go out the body weigher of the detailed description of the invention according to the present invention.Body weigher 1 is for measuring human body
The scale of body weight, body weigher 1 is also to measure health constituent (such as body fat percentage)
Body composition measuring instrument.Body weigher 1 includes that shell 11, shell 11 include that platform 12 is with solid
Base due to platform 12.As it is shown in figure 1, platform 12 includes the upper surface being similar to plane, this is straight
Connect and be easy to when measuring body weight be in level.People stands on the upper surface of platform 12.It is, object
It is placed on platform 12 and the load of object puts on described platform.
As in figure 2 it is shown, base 15 is formed as approximate rectangular shape, and by such as rigid material (as
Rustless steel or resin) make.Supporting leg 16 is configured at each corner in four corners of the bottom surface of base 15.
When measuring body weight, supporting leg 16 contacts with ground.Independent parts may be inserted into supporting leg 16 and ground it
Between.Each supporting leg 16 is used as supports support body weigher 1, and each supporting leg 16 also serves as
The supporting leg of the load transducer being described later on.When measuring body weight, whole including platform 12 and base 15
Individual shell 11 configures about by the supporting leg 16 of ground supports, with the body weight in response platform 12.
The on and off switch 17 activating body weigher 1 is connected to shell 11, and on and off switch 17
Stretch out from the side of platform 12.Owing to body weigher is used as body composition measuring instrument, the most multiple
Electrode slice 18 is arranged on the upper surface of platform 12, as shown in Figure 1.These electrode slices 18 are used for measuring
The bio-impedance (bioelectrical impedance) of human body.The human body bi-pedal stood on platform 12 exists
On electrode slice 18.
Fig. 3 is the top view of display body load measurement device 1, but is shown without electrode slice 18 in Fig. 3.As
Shown in Fig. 3, platform 12 includes the box-like inner cover 13 as being made up of rigid material (such as steel) and is arranged in
Inner cover 13 outside and the outer housing 14 being formed from a resin.Outer housing 14 is the enclosing cover of platform 12 and makes gold
Belong to inner cover 13 to insulate with electrode slice 18.
Body weigher 1 includes handle unit 19.Handle unit 19 is through cable (not shown) even
It is connected to shell 11.Handle unit 19 includes central operation case 20 and to control box 20(Fig. 1) both sides prolong
The lever 21 and 22 stretched.Control box 20 is provided with body weight and the display of body composition of display human body
23 and operation button 24 and 25.Each lever 21 and 22 is provided with for measuring human-body biological impedance
Electrode.Stand in the human body on platform 12 and with the hands hold these electrodes.Body according to present embodiment
Load measurement device 1 can also act as measuring body composition instrument, but owing to present embodiment relates to measured body weight,
The most substantially need not electrode slice 18 and handle unit 19.
As it is shown on figure 3, the inner cover 13 of platform 12 matches with the base 15 being connected to platform 12 with limit
Constant volume receives space 27.Four load transducer assemblies 30 are arranged on inside receiving space 27, in order to measure
Body weight.But, the supporting leg 16 of load transducer assembly 30 extends downwardly from from pedestal 15, such as Fig. 2 institute
Show.
Further, substrate 28 is arranged in receiving space 27, is used for processing load cell assembly 30
The process circuit of signal that provides of foil gauge be arranged on substrate 28.Substrate 28 is by cable 29 even
It is connected to described foil gauge.The circuit that processes on substrate 28 carries according to the foil gauge of load cell assembly 30
The signal of confession calculates the body weight of human body.Additionally, the process circuit on substrate 28 is electrically connected on platform 12
Electrode slice 18 and handle unit 19 on electrode, and according to body weight and human body on diverse location raw
The body composition of the change calculations human body of thing impedance.Body weight calculated as above and body composition show
On display 23.
As shown in Figure 4 and Figure 5, each load transducer assembly 30 includes that (load passes load-transmitting element
Sensor bracket) 32 and load transducer 34.Such as, load-transmitting element 32 is by rigid material (such as resin)
Make.Load-transmitting element 32 covers load transducer 34 and is removably attachable to load transducer 34.
It addition, load-transmitting element 32 is removably attachable to the inner cover 13 of platform 12.Load-transmitting element 32 will
The load passed over from platform 12 is delivered to the flexible element 36 of load transducer 34.
As it is shown in figure 5, load transducer 34 includes: flexible element 36, flexible element 36 is by by platform
12 transmission load and deform；Multiple foil gauges 38, multiple foil gauges 38 are connected to flexible element 36；Even
Connecing beam (bridge) 40, tie-beam 40 supports flexible element 36；And supporting leg 16, supporting leg 16 supports even
Connect beam 40.More specifically, tie-beam 40 is seen Figure 14 and Figure 15 by elastic supporting member for supporting optical member 42() support,
And elastic supporting member for supporting optical member 42 is supported by supporting leg 16.But, elastic supporting member for supporting optical member 42 is not shown in FIG. 5.
Cable 29 for foil gauge 38 is adhered to flexible element 36 by adhesive tape 50.
As from shown in the axonometric chart that tiltedly upside is seen of Fig. 8 and the upward view of Fig. 9, flexible element 36 is for having
Axisymmetric shape and the single part of uniform thickness.Such as, flexible element 36 is formed by plate, this plate
It is made up of the high rigid material such as carbon tool steel.Flexible element 36 includes: strain region 361, this strain
Region 361 is arranged on the central authorities of flexible element 36；Two the first arms 362；Two the second arms 364；
First connecting portion 363, strain region 361 is connected to the first arm 362 by the first connecting portion 363；With
And second connecting portion 365, strain region 361 is connected to the second arm 364 by the second connecting portion 365.
Strain region 361 is rectangular portion, and this rectangular portion includes in same direction (the symmetry of flexible element 36
The direction of axis) one end 361a of extending and other end 361b.Strain region 361 is for by passing through load
Load that transferring member 32 is transmitted from platform 12 and deform the region of maximum.Foil gauge 38 is connected to strain
Region 361(is shown in Fig. 5).The upper surface in strain region 361 is provided with for guiding foil gauge 38 to connect
Labelling 368 on strain region 361.
Two the first arms 362 are parallel to the axis of symmetry extension of flexible element 36.First connecting portion 363
Direction along the axis of symmetry of perpendicular quadrature flexible element 36 extends, and the first connecting portion 363 is connected to
Two the first arms 362 and one end 361a in strain region 361.
Two the second arms 364 are set to than the first arm 362 closer to strain region 361, and two
Individual second arm 364 is parallel to the axis of symmetry of flexible element 36 and extends.Second connecting portion 365 is along vertically
The direction of the axis of symmetry of orthogonal flexible element 36 extends, and the second connecting portion 365 is connected to the second arm
Portion 364 and the other end 361b in strain region 361.
One end of each first arm 362 is formed as semi-circular shape, and this end is provided with the first of circle
Through hole 366.One end of each second arm 364 is formed as semi-circular shape, and this end is provided with circle
The second through hole 367.The central axis of the first through hole 366 and the second through hole 367 is arranged in perpendicular quadrature
On the axis of symmetry of flexible element 36.Flexible element 36 generally includes and is formed at strain both sides, region 361 substantially
The symmetrical groove 369 of J-type, and each groove 369 by strain region the 361, first arm 362,
First connecting portion the 363, second arm 364 and the second connecting portion 365 around.
At the second arm 364 by the supporter (connection being described below being arranged in below flexible element 36
Beam 40) support in the case of, load downward vertically by load-transmitting element 32 from upside concentrate apply
To the first arm 362, so that strain region 361 deforms (when in time laterally seeing, namely with display
The paper of Fig. 9 parallel direction is deformed into S type when seeing).Each foil gauge on strain region 361
The signal of 38 deformation producing the strain region 361 in response to flexible element 36.
In the present embodiment, load downward vertically is applied from upside concentration by load-transmitting element 32
To the first arm 362.Second arm 364 is fixed on and is arranged in the supporter below flexible element 36 (below
The tie-beam 40 that will describe).But, flexible element 36 is not limited to this purposes, it is also possible to use
Flexible element 36 so that load is applied on the second arm 364 in vertical direction, and the first arm
362 are fixed on described supporter.It is, in a pair first arms 362 and a pair second arms 364
A pair on the direction being perpendicular to flexible element 36 by load, and a pair first arms 362 and
To another in the second arm 364 to being fixed on described supporter.No matter which kind of situation, flexible element 36
Large deformation is occurred to use for the mode of S type with strain region 361.
As shown in Figures 4 to 6, load-transmitting element 32 includes octagonal upper wall 321.Upper wall 321
Inner cover 13(Fig. 3 with platform 12) contact.The upper surface of upper wall 321 be provided with multiple protruding 322,
323、324、325.Protruding 322,323,324,325 are contained in the hole being formed on inner cover 13 (not
Illustrate) in.In this way, load-transmitting element 32 is removably attachable to the inner cover 13 of platform 12.
Upper wall 321 is arranged in parallel to the upper surface of platform 12 and arranges.Upper wall 321 covers whole flexible element 36.
As shown in Fig. 5, Fig. 7 and Figure 10, load-transmitting element 32 include two from upper wall 321 to downward
The sidewall 326 stretched.As shown in the upward view of Figure 10, each sidewall 326 includes towards flexible element 36
The lower area 327 of the first arm 362.Each lower area 327 includes smooth lower contact surface
327a and smooth bottom non-planar contact surfaces 327b, smooth lower contact surface 327a and flexible element 36
The first arm 362 part surface contact, smooth bottom non-planar contact surfaces 327b is non-contacting
Towards the first arm 362 of flexible element 36 under state.Lower contact surface 327a and bottom noncontact table
Face 327b is parallel to the axis of symmetry of flexible element 36 and extends.It addition, lower contact surface 327a and under
Portion non-planar contact surfaces 327b is parallel to upper wall 321 and arranges, thus lower contact surface 327a and bottom are non-
Contact surface 327b is parallel to the upper surface of platform 12 and arranges.Therefore, lower contact surface 327a and
Bottom non-planar contact surfaces 327b is directly easy to when measured body weight horizontal-extending.At lower contact surface
Step is formed between 327a and bottom non-planar contact surfaces 327b.
As shown in the top view of Figure 10, each first arm 362 of flexible element 36 includes the first through hole
366, the axis at measured body weight period the first through hole 366 is extends in the vertical direction, and load transmission
The lower area 327 of each sidewall 326 of part 32 is provided with the projection 328 inserting the first through hole 366.
Lower contact surface 327a is positioned at the surrounding of protruding 328.Load-transmitting element 32 also includes that two are arranged on
Outside two sidewalls 326 and be parallel to the exterior side wall 329 that two sidewalls 326 extend, each outside
Sidewall 329 is provided with hook portion 330, to hook the first arm 362 of flexible element 36.
As it is shown in fig. 7, load-transmitting element 32 also includes two interconnective end walls of sidewall 326 331.
End wall 331 is provided with notch 332, and the cable 29 being used for foil gauge 38 passes notch 332(Fig. 5).
As illustrated in figures 11 and 13, flexible element 36 is supported by tie-beam 40 and flexible element 36 is fixed
In tie-beam 40.Such as, tie-beam 40 is the single part being made up of rigid material (such as steel).As
Shown in Figure 12 and Figure 13, tie-beam 40 is to have the octagonal profile of approximation and the thickness of approaches uniformity
The plate of degree, tie-beam 40 includes the upper surface 401 of almost plane and the lower surface 402 of almost plane.On
Surface 401 and lower surface 402 can be directly easy to when measured body weight horizontal-extending.
The boss 403 with circular contour is formed at two positions of tie-beam 40.Such as, boss 403
Can be made by compressing (press-molding).The surface of two boss 403 is essentially flat
Face, and contact with the lower surface (not having the surface of foil gauge 38) of flexible element 36.Through hole 404 shape
Become the central authorities at each boss 403.
Two through holes 404 of tie-beam 40 are overlapping with the two of flexible element 36 the second through holes 367 respectively,
And rivet passes through hole 404 and the second through hole 367.Flexible element 36 and tie-beam 40 are by two rivetings
Nail 410 is fixed.As shown in figure 13, in the present embodiment, one end of rivet 410 is from flexible element 36
Upper surface stretch out, and other header arrangement of rivet 410 are at the rear side of the boss 403 of tie-beam 40
Space in, in order to avoid from connection, the lower surface 402 of 40 stretches out.But, if rivet 410 is from connection
The overhang of beam 40 is sufficiently small, is described below at elastic supporting member for supporting optical member 42() not by rivet 410 folding
Break or in the case of deformation, elastic supporting member for supporting optical member 42 can tight contact between with the lower surface 402 of tie-beam 40.
The boss 403 of tie-beam 40 be used as to ensure flexible element 36 and tie-beam 40 upper surface 401 it
Between the pad in space.Even if it is, when flexible element 36 deforms, it is also possible to avoid flexible element 36
The upper surface 401 of the beam 40 that is connected such as the first connecting portion 363.
Additionally, tie-beam 40 is provided with the through hole 406,407 of ellipse.Through hole 406,407 is used as will
Tie-beam 40 is connected to supporting leg 16, is described below.
Tie-beam 40 is supported by the elastic supporting member for supporting optical member 42 shown in Figure 14 and Figure 15, and flexibly supports
Part 42 is supported by supporting leg 16.Elastic supporting member for supporting optical member 42 is the single part being made up of rubber.Such as Figure 14 extremely
Shown in Figure 16, elastic supporting member for supporting optical member 42 includes top 421 and bottom 422, and top 421 is formed as approximation
Parallelepiped shape and have two arc ends in the longitudinal direction, it is flat that bottom 422 is formed as approximation
Row hexahedral shape and there are two arc ends in the longitudinal direction.Top 421 in the longitudinal direction
Length is more than the length of bottom 422, and the width on top 421 is less than the width of bottom 422.
In the present embodiment, the upper surface of elastic supporting member for supporting optical member 42 is almost plane.But, elastic
The upper surface of support member 42 can be formed as circular shape, and described upper surface can have uneven portion.
The lower surface 402 of tie-beam 40 tight contacts between with the upper surface of elastic supporting member for supporting optical member 42.Tie-beam 40 closes
Configure in elastic supporting member for supporting optical member 42, thus two rivets 410 are parallel to the length direction cloth of elastic supporting member for supporting optical member
Put.The bottom 422 of elastic supporting member for supporting optical member 42 is arranged in supporting leg 16, and is supported by supporting leg 16.
As shown in Figure 14, Figure 15 and Figure 17 to Figure 20, supporting leg 16 includes the leg body of cylinder
161 and around leg body 161 configuration annular rim portion 164.Tie-beam 40 is placed on leg body 161
On.The upper surface of leg body 161 is provided with recess 162, and recess 162 is provided with elastic supporting member for supporting optical member 42
Bottom 422 configure part within it.As shown in figure 17, the lower surface of recess 162 is provided with many
Individual approximate rectangular elongated hole 163, and due to elongated hole 163, the lower surface of recess 162 is formed as
Lattice shape.Configuration leg body 161, so that the lower surface of leg body 161 directly connects with ground
Touch, and by ground supports.But, single parts (carpet supporting leg the most described later) can
To be inserted between leg body 161 and ground.The single part that supporting leg 16 is for example, formed from a resin.
As shown in Figure 14, Figure 15, Figure 17 and Figure 18, leg body 161 and edge part 164 pass through
The elastic joint part 165,166,167,168 of four bendings is connected to each other.Elastic joint part 165,166,
167, the 168 90 ° of layouts in interval, and each elastic joint part 165,166,167,168 include
The outside inside with circular arc plate-like, described outside is elongated S type and the inner circumferential being connected to edge part 164,
The inside of described circular arc plate-like is connected to the periphery of the upper end of leg body 161.Elastic joint part 165,
166,167,168 are formed as thin.Specifically, elastic joint part 165,166,167,
In 168, be formed as outside 165a, 166a, 167a, 168a shape of elongated S type near edge part 164
Become more elongated than inside 165a, 166a, 167a, 168a of the circular arc plate-like of close leg body 161.
Therefore, elastic joint part 165,166,167,168, specifically, outside 165a, 166a, 167a,
168a has high elasticity.In the present embodiment, elastic joint part 165,166,167,168
There is curve shape, but the invention is not limited in this.Such as, described elastic joint part can be formed as
Rectilinear form.
Supporting leg 16 includes two the first protuberances 170,171 protruded inwardly from from edge part 164.Additionally,
Supporting leg 16 includes that the second protuberance 172, the second protuberance 172 are integrally connected to elastic joint part 165
Inside 165b, and along the circumferencial direction of axis about leg body 161 from elastic joint part 165
Stretch out；Second protuberance 173, the second protuberance 173 is integrally connected to the inside of elastic joint part 166
166b, and stretch out along the circumferencial direction of axis about leg body 161 from elastic joint part 166；
Second protuberance 174, the second protuberance 174 is integrally connected to the inside 167b of elastic joint part 167,
And the circumferencial direction along the axis about leg body 161 stretches out from elastic joint part 167；And the
Two protuberances 175, the second protuberance 175 is integrally connected to the inside 168b of elastic joint part 168, and
And stretch out along the circumferencial direction of axis about leg body 161 from elastic joint part 168.First highlights
Portion 170 is arranged between the second protuberance 172 and the second protuberance 173, and the second protuberance 172
Dashing forward adjacent to first along on the circumferencial direction of the axis of leg body 161 with the second protuberance 173
Go out portion 170.First protuberance 171 is arranged between the second protuberance 174 and the second protuberance 175,
And the second protuberance 174 and the second protuberance 175 are along about the axis around leg body 161
Adjacent to the first protuberance 171 on circumferencial direction.First protuberance the 170,171 and second protuberance 172,
173,174,175 prevent with adjusting the rotation that leg body 161 rotates against about edge part 164
Portion.
Tie-beam 40 is connected to the edge part 164 of supporting leg 16.First protuberance 170 of edge part 164,
171 are respectively arranged with and project upwards the protuberance 180,181 into column type.As it is shown in figure 5, protuberance 180,
In 181 through holes 406,407 inserting tie-beam 40.It addition, the edge part 164 of supporting leg 16 is provided with
Hook portion 182,183, and hook portion 182,183 adjusts the moving upward of tie-beam 40.Therefore, connect
Beam 40 is about the vertical movement of the edge part 164 of supporting leg 16 and horizontal movement (linear movement and rotate fortune
Dynamic) it is restricted.It is, edge part 164 is about the vertical movement of tie-beam 40 and horizontal movement
(linear movement and rotary motion) is restricted.
Figure 22 is the sectional view of the periphery of a load transducer assembly 30 of display body load measurement device 1.
In fig. 22, arrow represents load.It is applied to the load of outer housing 14 of platform 12 by inner cover 13 He
Load-transmitting element 32 is delivered to flexible element 36.Then, load is passed by tie-beam 40 from flexible element 36
Being delivered to elastic supporting member for supporting optical member 42, further, load is delivered to the leg body 161 of supporting leg 16, afterwards
By ground receiver.
In the present embodiment, elastic supporting member for supporting optical member 42 supports tie-beam 40.Tie-beam 40 includes that approximation is flat
The lower surface in face, this lower surface is directly in level during measured body weight.When measured body weight, elastic
The upper surface of support member 42 tight contacts between with the lower surface of the almost plane of tie-beam 40.Therefore, even if
When excessive load or repeated load are applied to body weigher 1, it is also possible to reduce load concentration in office
Position, portion and make the worry that section components ruptures, and keep certainty of measurement the most for a long time.Additionally,
Owing to there is no the protuberance of load concentration of local and being not connected to the parts of this protuberance, therefore it is not required to
The material using costliness manufactures these parts or these parts is carried out heat treatment, to increase these parts
Hardness, therefore can reduce the manufacturing cost of body weigher 1.
Additionally, the attitude of flexible element 36 is properly maintained by the elastic deformation of elastic supporting member for supporting optical member 42.Such as,
When two the first arms 363 of flexible element 36 or the height of two the second arms 364 are different from each other,
The deterioration in accuracy of measured body weight.But, the elastic deformation by elastic supporting member for supporting optical member 42 of this deterioration in accuracy
It is reduced or avoided.Additionally, due to elastic supporting member for supporting optical member 42 has the function reducing impact, even if when impact
When being applied on body weigher 1, remain to be reduced or avoided the loosening of parts of body weigher 1,
Thus ensure the long life of body weigher 1.
In supporting leg 16, the leg body 161 receiving load is concentrated to be connected to edge part 164, edge part
164 by having the fortune of elastomeric elastic joint part 165,166,167,168 regulation tie-beam 40
Dynamic.Owing to elastic joint part 165,166,167,168 has high resiliency, it is unnecessary therefore to avoid
Active force is applied to leg body 161 from edge part 164.
In body weigher 1, base 15 is connected to platform 12 and limits together with platform 12
Accommodate space 27.Accommodate space 27 regulate each load transducer assembly 30(supporting leg 16 top,
Load-transmitting element 32, flexible element 36, foil gauge 38, tie-beam 40 and elastic supporting member for supporting optical member 42)
Major part.But, as shown in figure 22, base 15 includes base plate through holes 15a, and each supporting leg 16
Bottom prominent to the downside of base 15 from accommodating space 27 by through hole 15a.Therefore, supporting leg
16 are not secured to base 15, and base 15 be arranged on about supporting leg 16 together with platform 12 vertical
On direction.
In supporting leg is fixed on the structure (being different from the structure of present embodiment) of base or platform, insert
Between supporting leg and platform flexible element deformation, with in response to the load being applied on flexible element from platform and from
Base is applied to the active force on flexible element.When load is applied to platform, base slight deformation, and
The load being applied to flexible element from base afterwards changes, with the attitude in response to base.Additionally, due to
Flexible element is deformed by load so that base and supporting leg are pullled mutually, is therefore applied on flexible element
Load changes.Additionally, when arranging during flexible element is such as present embodiment, due to the elasticity of elastic supporting member for supporting optical member
Compressive deformation, the pulling force between base and supporting leg increases further.Body weigher is passed through in these reductions
Measured body weight precision.
On the contrary, in the present embodiment, supporting leg 16 is being not secured to base 15 and the feelings of platform 12
Independent of base 15 and platform 12 under condition, and rear base 15 and platform 12 arrange about supporting leg 16
Together.Therefore, insert flexible element 36 deformation between supporting leg 16 and platform 12, with in response to from
Platform 12 is applied to the load on flexible element 36 and is applied to flexible element 36 from the bottom surface that supporting leg 16 is placed
On active force.But, the invention is not limited in that supporting leg 16 is independent of base 15 and platform 12
Configuration.Present invention can also apply to supporting leg 16 and be fixed on base 15 or the situation of platform 12.
Elastic supporting member for supporting optical member 42 is made up of rubber, but elastic supporting member for supporting optical member can be by other elastomers (such as spring)
Make.Present embodiment use the reason of rubber-like elasticity support member 42 be because rubber for repetition
Load be generally of high-durability, even and if when measured body weight during supporting leg 16(with after tie-beam
40), when being inclined relative to horizontal, measurement error is the least.Therefore, though when ground slight inclination or
When body weigher is relative to ground slight inclination, by the survey of the body weight that body weigher 1 is measured
Accuracy of measurement is fully guaranteed.
Figure 23 is the load transducer assembly 30 that display uses the elastic supporting member for supporting optical member 42 being made up of different rubber
The form of durability test result.In this test, repeat to execute by the load of 50 kilograms (kgf)
It is added on single load cell assembly 30 20000 times.
Using by having Shore hardness (Shore hardness) A90 and Shore hardness (Shore
The load transducer assembly 30 of the elastic supporting member for supporting optical member 42 that hardness) rubber of A80 is made is not asked
Topic occurs.Prop up by having Shore hardness (Shore hardness) elasticity that the rubber of A70 is made using
In the load transducer assembly 30 of support member 42, there is crackle in the inner side of the base 16 being formed from a resin,
But when considering the access times of conventional weight scale, load transducer assembly can be used in body weigher
In 1.In the resilient support that use is made up of the rubber with Shore hardness (Shore hardness) A60
In the load transducer assembly 30 of part 42, the crackle of the supporting leg 16 being formed from a resin significantly produces, from
And it is clearly visible crackle from the outside.Therefore, it was demonstrated that there is Shore hardness (Shore hardness) A60
Elastic supporting member for supporting optical member 42 be not good enough.This is due to the fact that.If elastic supporting member for supporting optical member 42 is by very
Soft rubber is made, then the compression of elastic supporting member for supporting optical member 42 in the vertical direction is very big, and elastic
Support member 42 the most excessively broadens, and therefore increases and makes to be configured with propping up of elastic supporting member for supporting optical member 42
The active force that lower limb 16 broadens.
Figure 24 is to show the relation between hardness and measured body weight error by research elastic supporting member for supporting optical member 42
The curve chart of the experimental result obtained.In this experiment, by making the shell 11 of body weigher 1
Increase strain and record body weight measurements.The shell 11 making body weigher 1 increases the mode of strain
The flat plank that connection has soft rubber is placed on platform 12, and counterweight is placed into described flat plank
On mode.This mode is similar to people and stands in the state on platform 12.As shown in figure 24, about load
The error of lotus occurs due to the strain that increases on shell 11.Along with the hardest error of rubber has increase
Trend.If additionally, it is contemplated that supporting leg 16(and body weigher afterwards 1) due to
The inclination on the ground according to experimental rules and tilt, then identical experimental result will be obtained.But, root
According to the experimental result shown in Figure 24, it was determined that due to for having Shore hardness (Shore
Hardness) even if the measured body weight error of the rubber of A70 to A90 is 150 kilograms (kgf) in load
In the case of be not the most very big, the most actually by no problem appearance.For having Shore hardness
The error of the rubber of (Shore hardness) A90 when load is 150 kilogram be 80 gram forces and
It is 60 gram forces when load is 125 kilogram.For than Shore hardness (Shore hardness) A90
Harder rubber, it is believed that certainty of measurement reduces further.
Experimental result according to Figure 23 and Figure 24, it is generally desirable to the hardness of elastic supporting member for supporting optical member 42 is Shore
Hardness (Shore hardness) A70 to Shore hardness (Shore hardness) A90.If by rubber
The hardness of the elastic supporting member for supporting optical member 42 made is that Shore hardness (Shore hardness) A70 is to Shore hardness
(Shore hardness) A90, then high relative to the durability of repeated boad, and even when in body weight
Supporting leg 16(and tie-beam afterwards 40 during measurement) when being inclined relative to horizontal, measurement error is also
Little.
Arrive it is desirable that the hardness of elastic supporting member for supporting optical member 42 is Shore hardness (Shore hardness) A75
Shore hardness (Shore hardness) A85.According in the experiment of Figure 23, using by having Xiao
The load transducer group of the elastic supporting member for supporting optical member 42 that the rubber of family name's hardness (Shore hardness) A70 is made
In part 30, there is crackle in the inner side of the supporting leg 16 being formed from a resin, but hard by having Shore using
The load transducer assembly 30 of the elastic supporting member for supporting optical member 42 that the rubber of degree (Shore hardness) A80 is made
In do not go wrong.Therefore, from the point of view of durability, it is believed that there is Shore hardness (Shore
Hardness) rubber of the high rigidity of A75 or bigger more meets the requirements.According in the experiment of Figure 24,
For having the rubber of Shore hardness (Shore hardness) A90, under load is 125 kilograms,
Error is about 60 gram forces；For having the rubber of Shore hardness (Shore hardness) A80, carrying
Lotus is under 125 kilograms, and error is about 30 gram forces.When assuming that load is to allow under 125 kilograms
Error is 50 gram forces, it is believed that have the rubber of Shore hardness (Shore hardness) A85 or less hardness
Glue is preferable.
Above with reference to described in accompanying drawing 10, the lower area 327 of each sidewall 326 includes smooth bottom
Contact surface 327a and smooth bottom non-planar contact surfaces 327b, lower contact surface 327a and flexible element
The part surface contact of first arm 362 of 36, bottom non-planar contact surfaces 327b is in non-contacting state
Under towards the first arm 362 of flexible element 36.Lower contact surface 327a and bottom non-planar contact surfaces 327b
Between formed step.During measured body weight, lower contact surface 327a and the first arm of flexible element 36
The part surface contact in portion 362, and the most horizontal-extending.Lower contact surface 327a is along being parallel to
The direction of the axis of symmetry of flexible element 36 extends, and the direction is the direction that the first arm 362 extends.Cause
This, when load is applied on platform 12, by the two of the flexible element 36 of the load from platform 12
Small being almost negligible of change of the attitude of individual first arm 362.Additionally, two sidewalls 326
The lower area 327 of each be not provided only with lower contact surface 327a, be additionally provided with that bottom is non-to be connect
Touch surface 327b.It is, only section lower region 327(lower contact surface 327a) with flexible
The part surface contact of the first arm 362 of part 36, and another part (bottom non-planar contact surfaces 327b)
Towards the first arm 362 under non-contacting state.So, each sidewall 326 of load-transmitting element 32
The part contacted with the first arm 362 limited by lower contact surface 327a, therefore flexible element
First arm 362 of 36 when being similar to straight contact to have the table of the narrowest width
Face contacts with lower contact surface 327a.The narrowest to have at the first arm 362 of flexible element 36
The surface of width contact with lower contact surface 327a in the case of, the first arm 362 of flexible element 36
Load concentration part according to load capacity change.But, in the present embodiment, due to flexible element 36
The first arm 362 when being similar to straight contact with have the surface of the narrowest width with
Lower contact surface 327a contacts, the therefore load concentration part essence of the first arm 362 of flexible element 36
On not according to load capacity change.Additionally, the bottom non-planar contact surfaces 327b of each sidewall is corresponding not
The part contacted with the first arm 362 ensures that the thickness of sidewall 326 is big, and contributes to suppressing load to pass
Pass the deformation of part 32.Therefore, in the present embodiment, when upper, no matter the size of load capacity, holds
The least by the attitudes vibration of two arms of the flexible element 36 of the load at least from platform 12, because of
This ensure that the certainty of measurement of body weigher 1.
Each first arm 362 is included in the first through hole vertically directly extended during measured body weight
366, the lower area 327 of each sidewall 326 of load-transmitting element 32 is provided with protruding 328, to insert
Enter the first through hole 366, and lower contact surface 327a is positioned at protruding 328 around.Due in body weight
During measurement, protruding 328 are arranged in the first through hole 366 vertically directly extended, and therefore avoid
Flexible element 36 and load-transmitting element 32 relative motion in the horizontal direction.Additionally, due to bottom connects
Tactile surface 327a is positioned at and is arranged on the projection 328 of the first through hole 366 around, even if when load is executed
When being added to from the position that the projection 328 of load-transmitting element 32 offsets, lower contact surface 327a and scratching
First arm 362 of property part 36 contacts with each other in the horizontal plane, thereby ensure that body weigher 1
Certainty of measurement.
Figure 25 is shown in the pressure distribution schematic diagram produced on flexible element 36 during measured body weight.Pressure
Distribution is obtained by computer simulation.In fig. 25, region A1 is minimum pressure region, and region A5 is
Maximum pressure region.Along with the numerical value about region A reduces, the amount of pressure of generation reduces.From Figure 10
With in the comparison of Figure 25 it is evident that the lower area of the sidewall 326 of load-transmitting element 32 327 times
Portion's contact surface 327a has the district of small strain with pressure span A1 and A2 corresponding to flexible element 36
Territory contacts.Therefore, region A1 and A2 of flexible element 36 receives with stable attitude and transmits from load
The load of the lower contact surface 327a in the lower region portion 327 of the sidewall 326 of part 32, thus ensure that
The certainty of measurement of body weigher 1.
As above by with reference to described in accompanying drawing 10, load-transmitting element 32 also includes two exterior side wall 329,
The two exterior side wall 329 is arranged in the outside of two sidewalls 326 and is parallel to two sidewalls 326 and prolongs
Stretch, and each exterior side wall 329 is provided with hook portion 330, to hook the first arm of flexible element 36
362.Owing to flexible element 36 is hooked in the hook portion 330 of load-transmitting element 32, therefore, flexible element 36 He
Load-transmitting element 32 can be integrally connected to platform 12 and separate with platform 12.Therefore, these parts
Can operate easily.
As above by with reference to described in Figure 14, Figure 15, Figure 17 and Figure 18, each supporting leg 16 includes two
First protuberance the 170,171 and second protuberance 172,173,174,175, the first protuberance 170,
171 protrude inwardly from from edge part 164, and the second protuberance 172,173,174,175 is integrally connected to bullet
Property connecting portion 165,166,167,168.First protuberance 170 is arranged on the second protuberance 172 and
Between two protuberances 173, and the second protuberance 172 and the second protuberance 173 are along around supporting leg master
Adjacent to the first protuberance 170 on the circumferencial direction of the axis of body 161.First protuberance 171 is arranged on
Between second protuberance 174 and the second protuberance 175, and the second protuberance 174 and the second protuberance
175 along about on the circumferencial direction of the axis around leg body 161 adjacent to the first protuberance 171.
Therefore, even if when being applied to supporting leg master when edge part 164 is restricted about the rotation of axis
When the moment of torsion of body 161 is bigger, the first protuberance 170 and the second protuberance 172 or the second protuberance 173
Contact, the first protuberance 171 contacts with the second protuberance 174 or the second protuberance 175, and supporting leg
The rotation (with the deformation of elastic joint part 165,166,167,168 afterwards) of main body 161 is subject to
Limit, thus avoid the elastic joint part 165,166,167,168 around leg body 161 configuration
Rupture.
As above by described in reference diagram 5, the protuberance 180,181 of the edge part 164 of supporting leg 16 inserts even
Connecing in the through hole 406,407 of beam 40, therefore edge part 164 is relative to the horizontal movement of tie-beam 40
(linear motion and rotary motion) is suppressed.As it has been described above, flexible element 36 is shown in by rivet 410(
Figure 11 and Figure 22) it is fixed on tie-beam 40.Additionally, flexible element 36 is connected to load-transmitting element 32,
Thus two the first through holes 366 of flexible element 36 it are arranged on two projections 328 of load-transmitting element 32
Interior mode (see Figure 10 and Figure 22) limits the flexible element 36 horizontal movement about load-transmitting element 32.
Fig. 4 to Fig. 6 is seen) by lordosis 322,323,324,325 being locked in the inner cover 13(of platform 12
Mode prevent the load-transmitting element 32 movement relative to platform 12.Therefore, the edge part of supporting leg 16
164 are controlled so that described edge part does not rotates about platform 12.It is, at body weigher
In the configuration of 1, suppress edge by tie-beam 40, flexible element 36, load-transmitting element 32 and platform 12
Portion 164 is around the rotation of axis.Therefore, it is not provided with the first protuberance 170,171 and at supporting leg 16
In the configuration of the second protuberance 172,173,174,175, it is envisaged that when high pulling torque applies
Time on leg body 161, elastic joint part 165,166,167,168 may be broken off.But,
By means of the effect of first protuberance the 170,171 and second protuberance 172,173,174,175, i.e.
Making when high pulling torque is applied on leg body 161, the rotation of leg body 161 is (with elasticity afterwards
The deformation of connecting portion 165,166,167,168) also can be restricted, therefore avoid around supporting leg master
Rupturing of the elastic joint part 165,166,167,168 of body 161 configuration.
When carpet supporting leg is connected to each supporting leg 16, the first protuberance 170,171 and second highlights
The effect in portion 172,173,174,175 is particularly effective.Figure 26 is the solid of diagram carpet supporting leg 60
Figure.Such as, carpet supporting leg 60 is by the substantial disk shaped part of resin formation, and includes smooth
Lower surface 61.Multiple protuberances 62 central authorities on the top of carpet supporting leg 60 protrude upward.These are many
Individual protuberance 62 inserts multiple holes 185 of the lower surface of the leg body 161 being formed at supporting leg 16 respectively
In.In this way, carpet supporting leg 60 is removably attachable to leg body 161.Carpet supporting leg
The diameter of 60 is more much bigger than the diameter of leg body 161.Therefore, it is connected to supporting leg when carpet supporting leg 60
During main body 161, high pulling torque is likely to be applied to leg body 161 from carpet supporting leg 60.Owing to first dashes forward
Go out portion's the 170,171 and second protuberance 172,173,174,175 and close as controlling leg body 161
In the rotation preventing portion of the rotation of edge part 164, even if therefore putting on leg body 161 at high pulling torque
Time, also avoid rupturing of elastic joint part 165,166,167,168.
Being similar to Figure 22, Figure 27 is to show cuing open of the body weigher 1 according to another embodiment
View.Body weigher 1 does not include load-transmitting element 32, and load directly applies from platform 12
To flexible element 36.The lower surface of the inner cover 13 of platform 12 is provided with boss 13a, and each boss 13a
It is provided with screwed hole.First arm 362 of flexible element 36 is against boss 13a, and passes through boss 13a
Screwed hole constraint be passed through the screw 70 of the first through hole 366 of the first arm 362.By this
Mode, flexible element 36 is directly fixed on inner cover 13.
In figure 27, arrow represents load.The load of the outer housing 14 being applied to platform 12 passes through inner cover
13 are delivered to flexible element 36.Then, load is delivered to elastic by tie-beam 40 from flexible element 36
Support member 42, and it is delivered to the leg body 161 of supporting leg 16 further, connect by ground in this load
Receive.
In all of embodiment, it is generally desirable to flexible element is formed by powder metallurgy.With by punching
The flexible element that swaging becomes is compared, and the flexible element formed by powder metallurgy contributes to reducing flexible element 36
Size and help to ensure that the mechanical strength of flexible element 36.Additionally, due to when using powder metallurgy
During art, the thickness of flexible element 36 and the dimensional accuracy of width are high, therefore improve the body of load transducer
Remeasurement precision.As the method for powdery metallurgy, metal dust can be to be pressed molding and be sintered,
Or metal injection molded (MIM) can also be used.
With reference to Fig. 9, the ideal dimensions of flexible element 36 will be described.Preferably, the first arm 362 and second
The clearance G 2 etc. between clearance G 1 and the second arm 364 and strain region 361 between arm 364
In or less than the half of thickness of flexible element 36.Owing to clearance G 1 and clearance G 2 are set to less, because of
This size achieving flexible element 36 reduces (specifically, the length of the side surface direction of Fig. 9).It is being suitable for
In the metal material of the high intensity of described flexible element, the gap in Sheet Metal Forming Technology only can be set to
Equal to the thickness of flexible element 36, and the thickness of flexible element 36 can not be thinner than.But, described gap energy
Enough thinning by powder metallurgy, therefore, it is possible to reduce the size of flexible element 36.
Preferably, each first arm 362 is on the direction of the axis of symmetry being perpendicular to flexible element 36
Length L1 is the strain region 361 length on the direction of the axis of symmetry of perpendicular quadrature flexible element 36
1.3 times or more of L2.Each first arm 362 is provided with the first through hole 366, and can pass through
The first through hole 366 screw is used to be fixed on other parts (for inner cover 13 in embodiment in figure 27).
When gap L 1 between two side surfaces of each arm 362 is bigger, it is possible to reduce the first arm 362
On residual stress, this remnants residual stress by when tightening screw 70 produce screw-down torque cause.By
In residual stress, the measured body weight precision of load transducer is adversely affected, it is generally desirable to residual stress is
Little.When each first arm 362 length on the direction of the axis of symmetry being perpendicular to flexible element 36
L1 is the strain region 361 length L2 on the direction of the axis of symmetry of perpendicular quadrature flexible element 36
When 1.3 times or more, residual stress reduces, and therefore can improve the measured body weight precision of load transducer.
Preferably, first connecting portion 363 length on the direction of the axis of symmetry being parallel to flexible element 36
Degree L3 is the strain region 361 length l2 on the direction of the axis of symmetry of perpendicular quadrature flexible element 36
1.4 times or more.When the first connecting portion 363 is on the direction of the axis of symmetry being parallel to flexible element 36
Length L3 big time, it is possible to reducing the residual stress on the first arm 362, this residual stress is by tightening
The screw-down torque produced during screw 70 causes.Due to the residual stress measured body weight essence to load transducer
Degree adversely affects, it is generally desirable to residual stress is little.When the first arm 363 is being parallel to flexible element
Length L3 on the direction of the axis of symmetry of 36 is that strain region 361 is at perpendicular quadrature flexible element 36
During 1.4 times or more of length L2 on the direction of the axis of symmetry, residual stress reduces, the most permissible
Improve the measured body weight precision of load transducer.
Figure 28 to Figure 30 obtains to study measured body weight error for being shown through change gap L 1 and length L3
The curve chart of the result arrived.Figure 28 illustrates when L1/L2 is equal to 86% equal to 86% and L3/L2,
Between the screw-down torque (1.0Nm, 2.0Nm, and 2.5Nm) of measured body weight error and screw 70
Relation.Figure 29 illustrates when L1/L2 is equal to 100% equal to 93% and L3/L2, measured body weight error
And the relation between the screw-down torque of screw 70.Figure 30 illustrates when L1/L2 is equal to 130% and L3/L2
Relation during equal to 140%, between the screw-down torque of measured body weight error and screw 70.From these figures
It is apparent that measurement error increases along with the increase of screw-down torque.This is because the first arm 362
On negatively affected measurement by the residual stress that causes of screw-down torque produced when tightening screw 70.But,
When L1/L2 is equal to 140%(as shown in figure 30 equal to 130% and L3/L2) time, measured body weight is by mistake
Difference is significantly less than the body weight error in other result shown in Figure 28 and Figure 29.Accordingly, it is to be understood that
Be, when 1.3 times that L1 is L2 or more and L3 is L2 1.4 times or more time, achieve aobvious
The effect write.
As it has been described above, flexible element 36 can be made by compressing and sintering metal powder, or can
To make according to metal injection molded.However, it is found by the inventors that be preferably by compressing and sintering
Particular kind of material manufactures flexible element 36.Described particular kind of material be at least include vanadium (V) and
Chromium (Cr) and mainly include the metal dust of ferrum (Fe).Hereinafter, will be described in this material
Material.
Inventor finds when the metal dust of the material as bender element 36 includes chromium and vanadium, can
To improve the mechanical strength of the flexible element 36 with complicated shape, described complicated shape includes two first
362, two second arm the 364, first connecting portion the 363, second connecting portions 365 of arm etc..Inventor
Also find, as the result of experiment (trial and error) repeatedly, when being obtained by sintering metal powder
Sintering metal when including 10.8% or more chromium, it is ensured that fit closely intensity.On the contrary,
When the amount of chromium is the biggest, flexible element 36 intensity is deteriorated and manufacturing cost increases.Inventor finds, makees
For the result repeatedly tested, it is contemplated that intensity and the balance of expense, it is generally desirable to pass through sintering metal powder
In the sintering metal obtained, the percentage composition of chromium is 18.2% or less.Accordingly, it would be desirable to by sintering
The sintering metal that metal dust obtains includes the chromium of 10.8% to 18.2%.
Inventor also finds, as the result repeatedly tested, when the sintering obtained by sintering metal powder
When metal includes 0.1% or more vanadium, it is ensured that fit closely intensity.On the other hand, when
When the amount of vanadium is the biggest, manufacturing cost increases.Specifically, owing to vanadium is much more expensive, therefore when vanadium amount too
Time big, cost is greatly increased.Inventor finds, as the result repeatedly tested, it is contemplated that intensity and taking
Balance, it is generally desirable to by the percentage composition of vanadium in the sintering metal that sintering metal powder obtains be
0.5% or less.Accordingly, it would be desirable to the sintering metal obtained by sintering metal powder includes 0.1%
To the vanadium of 0.5%.
When the metal dust of the material as flexible element 36 includes carbon, the hardness of flexible element 36 is by burning
Heat treatment after knot technique improves, and the mechanical strength of flexible element 36 can be improved.Invention Crinis Carbonisatus
Existing, as the result repeatedly tested, when the sintering metal obtained by sintering metal powder includes 0.5%
Or during more carbon, it is ensured that fit closely intensity.But, when the amount of carbon is the biggest, at sintering
During technique and heat treatment, the amount of contraction of material is big so that the size of flexible element 36 changes.When material
When amount of contraction is big, the flexible element 36 with complicated shape can not have the high accuracy of manufacture, described multiple
Miscellaneous shape includes 362, two second arm the 364, first connecting portions 363, second of two the first arms even
Meet portion 365 etc..Inventor finds, as the result repeatedly tested, it is contemplated that intensity and expense, when logical
When the percentage ratio of the carbon in the sintering metal that oversintering metal dust obtains is 1.8% or less, size changes
Become and suppressed rightly.Accordingly, it would be desirable to the sintering metal obtained by sintering metal powder wraps
Include the carbon of 0.5% to 1.8%.
Although it have been described that be used as body composition measuring instrument such as the body weigher of scale,
But the present invention relates to weight measurement, thus be accordingly used in other body weight of the weight measuring the object in addition to people
The parts of measurement apparatus and this body weigher also fall into the scope of the present invention.In the above-described embodiments,
Body weigher 1 is configured with four load transducer assemblies, but is arranged at the load of body weigher
The number of sensor cluster is not limited to four.
Open description above is merely to illustrate that and describes flexible element and the measured body weight dress of the present invention
The exemplary embodiment put.It need not be exhaustive or be not used in and limit the invention to any tool disclosed herein
Bodily form formula.It will be appreciated by those skilled in the art that without departing from the scope of the invention,
Various change can be made and equivalent can replace parts therein.Additionally, without departing from elemental range
In the case of, the teachings of the present invention can be made multiple amendment, to adapt to particular condition or material.Cause
This, the invention is not limited in as the specific embodiment party disclosed in preferred embodiment of the present invention
Formula, but the present invention will include all embodiments fallen within the scope of the claims.
List of reference signs
1 body weigher；11 shells；12 platforms；13 inner covers；13a boss；14 outer housings；
15 bases；15a base plate through holes；16 supporting legs；161 leg body；162 recesses；
163 elongated hole；164 edge parts；165,166,167,168 elastic joint part；
Outside 165a, 166a, 167a, 168a；Inside 165b, 166b, 167b, 168b；
170,171 first protuberance；172,173,174,175 second protuberance；
180,181 protuberance；182,183 hook portion；17 on and off switch；18 electrode slices；
19 handle units；20 control boxs；21,22 lever；23 display；24,25 operation button；
27 accommodate space；28 substrates；29 cables；30 load transducer assemblies；32 load-transmitting elements；
321 upper walls；322,323,324,325 is protruding；326 sidewalls；327 lower areas；
327a lower contact surface；327b bottom non-planar contact surfaces；328 is protruding；329 exterior side wall；
330 hook portions；331 end walls；332 notches；34 load transducers；36 flexible elements；
361 strain regions；361a end；361b end；362 first arms；363 first connecting portions；
364 second arms；365 second connecting portions；366 first through holes；367 second through holes；
368 labellings；369 grooves；38 foil gauges；40 tie-beams；401 upper surfaces；402 lower surfaces；
403 boss；404 through holes；406,407 through hole；410 rivets；42 elastic supporting member for supporting optical member；
421 tops；422 bottoms；50 adhesive tapes；60 carpet supporting legs；61 lower surfaces；62 protuberances；
70 screws.
Other inventions
Other inventions of coming from above description are described below.
Background technology
Japanese patent application No. No.2012-145389 discloses a kind of scale, and this scale includes many
Individual load transducer, each load transducer includes flexible element.Such as Japanese patent application No. No.
Disclosed in Fig. 2 and Fig. 5 of 2012-145389, the flexible element of each load transducer by supports support,
This support member is referred to as tie-beam and extends in the horizontal direction, and described tie-beam is by described scale
One supporting leg supports.The lower surface of described tie-beam is provided with downwardly projecting hemispherical protuberance, but
The rigid plate formed by metal embeds the top of described supporting leg.The protuberance of described tie-beam and embedding institute
Stating the plate contact of supporting leg, the most described tie-beam is supported by described supporting leg.
Described disclosure has the function of the attitude keeping described flexible element as far as possible, therefore scratches described in allowing
During property part deformation, load is the most vertically applied on described flexible element.In order to reach this
Purpose, the protuberance of described tie-beam contacts (preferable with the plate embedding described supporting leg at narrow space
For point cantact), even and if therefore when described supporting leg tilts, described tie-beam keeps horizontal attitude.
But, in the structure disclosed in Fig. 2 and Fig. 5 of Japanese patent application No. No.2012-145389
In, owing to the protuberance of described tie-beam contacts in narrow space with the plate embedding described supporting leg,
It is thus desirable to it is considered that described highlighting can be crushed by excessive load or repeated load.When described protuberance quilt
During crushing, described tie-beam can not keep the attitude of level easily, and is applied to described flexible element
On the direction of load no longer vertical, accordingly, it is possible to accurate measured body weight can not be completed.
Additionally, in order to bear concentrfated load, described tie-beam, the most described protuberance and with described
The described plate of protuberance contact needs at a relatively high hardness.In view of this, described tie-beam and described plate
Part is needed by having high rigidity or needing to be improved by heat treatment the expensive material manufacture of hardness.
Therefore, invent according to another, it is provided that one can reduce manufacturing expense and keep for a long time surveying
The body weigher of accuracy of measurement and load transducer.
Embodiments of the present invention are open by following clause:
1. a body weigher (1), this body weigher (1) including:
Platform (12), load is applied on this platform (12)；
At least one flexible element (36), this flexible element (36) by the load transmitted by described platform and
Deformation；
Multiple foil gauges (38), this foil gauge (38) be connected to described flexible element and produce in response to
The signal of the deformation of described flexible element；
At least one tie-beam (40), this tie-beam (40) supports described flexible element；And
At least one elastic supporting member for supporting optical member (42), this elastic supporting member for supporting optical member (42) supports described tie-beam, its
In, described tie-beam includes the lower surface (402) being similar to plane, and wherein, described resilient support
The upper surface of part contacts with the described lower surface of described tie-beam.
In the embodiment of clause 1, described elastic supporting member for supporting optical member supports described tie-beam.Described elasticity is propped up
The described upper surface of support member contacts with the lower surface being similar to plane described in described tie-beam.Therefore,
Even if when excessive load or repeated load are applied on described body weigher, it is possible to reduce about load
Lotus concentrates on local location so that the worry that fractures of the part of parts, and keeps the most for a long time measuring essence
Degree.Additionally, there is not the protuberance of load concentration of local and do not have what protuberance contacted with protuberance
Parts.Therefore, there is no need to use expensive material for these parts, or carry out heat treatment, to increase
The hardness of these parts big, such that it is able to reduce the manufacturing cost of described body weigher.
2. according to the body weigher (1) described in clause 1, wherein, described elastic supporting member for supporting optical member (42)
Described upper surface contact with described lower surface (402) surface of described tie-beam (40).Due to this
A little surfaces are in surface contact closely to each other, and the most described tie-beam is supported on by described elastic supporting member for supporting optical member
Stable attitude.Therefore, described elastic supporting member for supporting optical member can have the upper surface being similar to plane.
3. according to the body weigher (1) described in clause 1 or 2, wherein, described elastic supporting member for supporting optical member
(42) have and be similar to the upper surface of plane.
4. according to the body weigher (1) according to any one of clause 1-3, wherein, described elasticity
Support member (42) is formed by rubber.Usually, when described elastic supporting member for supporting optical member is formed by rubber, about
The ruggedness of repeated load is high.Even if additionally, when the described supporting leg (institute after with during measured body weight
State tie-beam) about horizontal plane time, measurement error is little.
5. according to the body weigher (1) described in clause 4, wherein, described elastic supporting member for supporting optical member (42)
Hardness from Shore hardness (Shore hardness) A70 to Shore hardness (Shore hardness) A90.
When the hardness of the elastic supporting member for supporting optical member formed by rubber at Shore hardness (Shore hardness) A70 to Shore
During scope between hardness (Shore hardness) A90, the ruggedness about repeated load is big.Additionally,
Even during measured body weight when described supporting leg (with described tie-beam afterwards) is about horizontal plane,
Measurement error is little.
6., according to the body weigher (1) according to any one of clause 1-5, described measured body weight fills
Putting (1) also to include: at least one supporting leg (16), this supporting leg (16) supports described elastic supporting member for supporting optical member (42)；
And
Base (15), this base (15) is connected to described platform (12) and and described platform (12)
Limit together and accommodate space (27), wherein, the top of supporting leg (16) described in described receiving space,
Described flexible element (36), described foil gauge (38), described tie-beam (40) and described resilient support
Part (42), wherein, described base includes base plate through holes (15a), and the bottom of described supporting leg is passed through
Described base plate through holes is prominent towards the downside of described base from described receiving space, and wherein, described
Lower limb is not secured to described base, the most described base and described platform and can set about described supporting leg is vertical
Put.
In described supporting leg is fixed on the structure (being different from the structure of described embodiment) of described base,
Insert the described flexible element deformation between described supporting leg and described platform, be applied to from described platform with response
The load of described flexible element and be applied to the active force of described flexible element from described base.When load is applied to
During described platform, described base slight deformation, and therefore it is applied to described flexible element from described base
Active force changes, to respond the attitude of described base.Additionally, due to described flexible element is become by load
Shape so that described base and described supporting leg are pullled each other, are therefore applied to the load on described flexible element
Lotus changes.Additionally, when described elastic supporting member for supporting optical member as described in clause 1 when arranging, due to described bullet
The elastic compression deformation of property support member, the pulling force between described base and described supporting leg increases further.This
Make the certainty of measurement variation of the body weight measured by described body weigher a bit.On the contrary, at clause 6
In described embodiment, described supporting leg when being not secured to described base independent of the described end
Seat, and described base and described platform be set together about described supporting leg.Therefore, described is inserted
Described flexible element deformation between lower limb and described platform, is applied to described flexible element with response from described platform
On load and from place described supporting leg ground be applied to the active force described flexible element.Even work as institute
State ground to be slightly tilted or time described body weigher is slightly tilted about ground, ensure that logical fully
Cross the certainty of measurement of body weight measured by described body weigher.
7. a load transducer (34), this load transducer (34) including:
At least one flexible element (36), this flexible element (36) is deformed by the load transmitted from upside；
Multiple foil gauges (38), this foil gauge (38) be connected to described flexible element and produce in response to
The signal of the deformation of described flexible element；
At least one tie-beam (40), this tie-beam (40) supports described flexible element；And
At least one elastic supporting member for supporting optical member (42), this elastic supporting member for supporting optical member (42) supports described tie-beam, its
In, described tie-beam includes the lower surface (40) being similar to plane, and wherein, described resilient support
The upper surface of part is connected to the described lower surface of described tie-beam.
Background technology
Japanese patent application No. No.2012-145389 discloses a kind of scale, and this scale includes many
Individual load transducer, each load transducer includes flexible element.Such as Japanese patent application No. No.
Disclosed in Fig. 2 and Fig. 5 of 2012-145389, the flexible element of each load transducer by supports support,
This support member is referred to as tie-beam, and this tie-beam extends in the horizontal direction, and described tie-beam is by institute
The supporting leg stating scale supports.Described flexible element has complicated shape, and described flexible element includes
Strain region, this strain region is arranged on the central authorities of described flexible element and in the side identical with the axis of symmetry
Upwardly extend；Two arms, these two arms are connected to the one end in described strain region, are parallel to described
The axis of symmetry extends, and by the load from platform；And two arms, these two arms connect
In the other end in described strain region, it is parallel to the described axis of symmetry and extends, and be fixed on described connection
Beam.Described strain region is to strain big region by what load produced, and foil gauge is connected to described
Strain region.
If load is applied on described platform in vertical direction, then the most described flexibility
The strain region of part is bent into S type.However, it is desirable that, when load is applied on described platform,
No matter load capacity is big or little, affords the said two arm of the load from described platform and is fixed on
Two arms of described tie-beam are held at horizontal attitude.When affording the load from described platform
When said two arm and two arms being fixed on described tie-beam are held at horizontal attitude, load exists
Described flexible element it is applied in vertical direction, and thereby ensure that the measurement essence of described body weigher
Degree.Do not find the device for this purpose so far.
Therefore, invent according to another, it is provided that a kind of body weigher and one are for this measured body weight
The load-transmitting element of device, when load is applied on described platform, no matter load capacity is big or little, is subject to
The attitude of at least said two arm arriving the described flexible element of the load from platform changes minimum.
Embodiments of the present invention are open by following clause:
1. a body weigher (1), this body weigher (1) including:
Platform (12), load is applied on this platform (12)；
At least one flexible element (36), this flexible element (36) by the load transmitted by described platform and
Deformation；
At least one load-transmitting element (32), load is passed by this load-transmitting element (32) from described platform
It is delivered to described flexible element；
Multiple foil gauges (38), this foil gauge (38) be connected to described flexible element and produce in response to
The signal of the deformation of described flexible element；
At least one tie-beam (40), this tie-beam (40) supports described flexible element；And
At least one supporting leg (16), this supporting leg (16) supports described tie-beam, wherein said flexible element
(36) include the axisymmetric shape about the axis of symmetry, and described flexible element (36) includes strain regions
Territory (361), this strain region (361) is arranged on the central authorities of described flexible element, with described axis of symmetry
The side that line is identical upwardly extends, and includes the first end (361a) and the second end (361b)；Two
One arm (362), these two the first arms (362) are connected to first end in described strain region, flat
Row extends in the described axis of symmetry, and by the load from described platform；And two the second arms
(364), these two second arms (364) are set to than described first arm closer to described strain regions
Territory, described second arm (364) is connected to second end in described strain region, is parallel to described symmetry
Axis extends, and is fixed on described tie-beam；And wherein, described load-transmitting element (32) includes
With the upper wall of described contact with platform (321) and two sidewalls (326) downwardly extending from described upper wall,
Each described sidewall includes the lower area (327) of the first arm towards described flexible element, each described
Lower area includes the lower contact surface (327a) of plane and the bottom non-planar contact surfaces (327b) of plane,
Described lower contact surface (327a) contacts with a part of surface of the first arm of described flexible element, institute
State bottom non-planar contact surfaces (327b) in the case of not contacting described first arm towards described flexible element
The first arm, and described lower contact surface and described bottom non-planar contact surfaces be parallel to described flexibility
The axis of symmetry of part extends and is directly easy to horizontal positioned during measured body weight.
In the embodiment of clause 1, the lower region of each of two sidewalls of described load-transmitting element
Territory includes described lower contact surface, and the first arm of described lower contact surface and described flexible element
A part of surface contact, and described lower contact surface be directly easy to measured body weight during level put
Put.Described lower contact surface upwardly extends in the side of the axis of symmetry being parallel to described flexible element, the party
To being the direction that described first arm extends.Therefore, when load is applied to described platform, arrived
Change the least from the attitude of two arms of the described flexible element of the load of platform.Additionally, each described side
The lower area of wall is not provided only with described lower contact surface and is additionally provided with bottom non-planar contact surfaces.The most just
It is, in described lower area partly (described lower contact surface) and the first of described flexible element
A part of surface contact of arm, other parts (described bottom non-planar contact surfaces) of described lower area
With non-contacting state towards described first arm.In this way, contact with described first arm
Each sidewall of described load-transmitting element be partially limited to described lower contact surface so that scratch described
Described first arm of property part when being similar to straight contact to have the narrowest width
Surface contacts with described lower contact surface.If described lower contact surface and the first of described flexible element
Arm contacts on the surface of width with non-constant width, the load of described first arm of described flexible element
Concentrated part changes according to the amount of described load.But, if described lower contact surface and described flexibility
First arm of part is mutual to have the surface of the narrowest width when being similar to straight contact
Contact, the load concentration part in the first arm of described flexible element does not changes according to load capacity.
Additionally, ensure that the bottom noncontact table corresponding to each described sidewall not contacted with described first arm
The part in face, in order to described sidewall has big thickness, and contributes to suppressing described load-transmitting element
Deformation.Therefore, in the embodiment of clause 1, when load is applied to described platform, no matter carry
Lotus amount is big or little, is subject to the appearance of at least two arm of the described flexible element of the load from described platform
State changes minimum, thus ensure that the certainty of measurement of described body weigher.
2. according to the body weigher (1) described in clause 1, wherein, each first arm (362)
The hole (366) directly extended in vertical direction during being included in measured body weight, wherein, described load passes
The lower area (327) of each sidewall (326) passing part (32) is provided with projection (328), to insert
Enter in described hole, and wherein, described lower contact surface (327a) is positioned at described projection all around.By
In described projection is installed on the described hole directly extended in vertical direction during measured body weight, therefore
Avoid described flexible element and described load-transmitting element relative motion in the horizontal direction.Additionally, due to
Described lower contact surface is arranged on the protruding surrounding in described hole around being positioned at, even if therefore load applies
On the protruding position deviateing described load-transmitting element, described lower contact surface and described flexible element
Described first arm contacts with each other the most in the horizontal plane, thereby ensure that the measurement of described body weigher
Precision.
3. according to the body weigher (1) described in clause 1 or 2, wherein, described load-transmitting element
(32) including two exterior side wall (329), these two exterior side wall (329) are arranged on said two
The outside of sidewall (326) and be parallel to said two sidewall and extend, each described exterior side wall is arranged
There is the hook portion (330) of in first arm (362) of flexible element described in hook (36).Due to
Described flexible element is by the hook portion hook of described load-transmitting element, the most described flexible element and the transmission of described load
Part can be integrally connected to described platform and separate with from described platform.Therefore, it can easily to operate described
Parts.
4. according to the scale measurement apparatus (1) according to any one of claim 1-3, described body weight
Scale measurement apparatus (1) also include base (15), this base (15) be connected to described platform and with institute
State platform and limit receiving space (27) together, the top of supporting leg (16) described in described receiving space,
Described load-transmitting element (32), described flexible element (36), described foil gauge (38) and described connection
Beam (40), wherein, described base includes base plate through holes (15a), and the bottom of described supporting leg is by described
Base plate through holes is prominent towards the downside of described base from described receiving space, and wherein, described supporting leg is not
It is fixed on described base, the most described base and described platform to be vertically arranged about described supporting leg.
The structure (a kind of structure being different from described embodiment) of described base it is fixed at described supporting leg
In, insert the described flexible element deformation between described supporting leg and described platform, execute from described platform with response
It is added to the load of described flexible element and is applied to the active force of described flexible element from described base.Due to when carrying
Lotus is described base slight deformation when being applied on described platform, is therefore applied to described flexibility from described base
The active force of part changes, to respond the attitude of described base.Additionally, due to described flexible element passes through load
Deformation so that described base and described supporting leg are pullled each other, are therefore applied to the load on described flexible element
Change.They make the certainty of measurement variation of the body weight measured by described body weigher.On the contrary,
In the embodiment described by clause 4, described supporting leg is independent in the case of being not secured to described base
In described base, and described base and described platform are set together about described supporting leg, therefore insert
Described flexible element deformation between described supporting leg and described platform, is applied to described with response from described platform
The load of flexible element and be applied to the active force of described flexible element from the ground placing described supporting leg.Even if working as
When ground is slightly tilted or described body weigher is slightly tilted about ground, also can ensure fully to lead to
Cross the certainty of measurement of the body weight that described body weigher is measured.Additionally, when described ground level, institute
State the attitude stabilization of tie-beam, thus described flexible element is fixed on the said two arm of described tie-beam
Attitude stabilization.Therefore, the certainty of measurement of described body weigher is further increased.
5. a body weigher (1), this body weigher (1) including:
Platform (12), load is applied on this platform (12)；
At least one flexible element (36), this flexible element (36) by the load transmitted by described platform and
Deformation, and
At least one load-transmitting element (32), load is passed by this load-transmitting element (32) from described platform
Being delivered to described flexible element, wherein, described load-transmitting element includes the upper wall (321) with described contact with platform
With two sidewalls (326) downwardly extended from described upper wall, each sidewall includes towards described flexible element
Lower area (327), each described lower area includes that the bottom of the plane contacted with described flexible element connects
Touch surface (327a), under non-contacting state towards the bottom noncontact table of plane of described flexible element
Face (327b) and the step formed between described lower contact surface and described bottom non-planar contact surfaces.
6. according to the body weigher (1) according to any one of clause 1-5, wherein, said two
The lower contact surface of each (327a) of sidewall (326) is arranged on described bottom non-planar contact surfaces
(327b) outside.
7. the load-transmitting element (32) for body weigher (1), this load-transmitting element (32)
Load is delivered to flexible element (36), flexible element (36) from the platform (12) of described body weigher
Deforming by being delivered to load thereon, described load-transmitting element includes:
Upper wall (321), this upper wall (321) and described contact with platform；With two sidewalls (326), it is somebody's turn to do
Two sidewalls (326) downwardly extend from described upper wall, each described sidewall include formed so that towards
The lower area (327) of described flexible element, each lower area include formed so that with described flexible element
The lower contact surface (327a) of the plane of contact, formed so that towards institute under non-contacting state
State the bottom non-planar contact surfaces (327b) of flexible element and non-at described lower contact surface and described bottom
The step formed between contact surface.
8. according to the load-transmitting element (32) described in clause 7, wherein, said two sidewall (326)
The lower contact surface of each (327a) be arranged on outside described bottom non-planar contact surfaces (327b)
Side.In this case, compared with contrary situation, by from described platform in described flexible element
The attitude of the said two arm of load changes minimum, thus ensure that the measurement of described body weigher
Precision.
Background technology
Japanese patent application No. No.2012-145389 discloses a kind of scale, and this scale includes many
Individual load transducer, each load transducer includes flexible element.Such as Japanese patent application No. No.
Disclosed in Fig. 2 and Fig. 5 of 2012-145389, the flexible element of each load transducer by supports support,
This support member is referred to as tie-beam, and this tie-beam extends in the horizontal direction, and described tie-beam is by institute
The supporting leg stating scale supports.Described supporting leg includes leg body, annular rim portion and multiple connection
Portion, described tie-beam is arranged on described leg body, the plurality of connecting portion elastically deformable and general
Described leg body and described edge part are connected with each other.
The described edge part of described supporting leg is fixed on the base of the base plate as described body weigher.Institute
State base and be connected to described platform, and described base and described platform limit the receiving accommodating multiple parts
Space.Described base includes through hole, and the described bottom of described leg body by described through hole towards
The downside of described base is prominent in order to be able to place on the ground.The company of each elastically deformable is set
Meet portion, in order to unnecessary active force is not applied to described leg body from described base, it is,
Described base and described platform can be arranged relative to described leg body.
But, in such supporting leg, when applying big moment around described supporting leg, described connection
Portion's deformation is big, and the most described connection ruptures.Usually, (referred to as there is big chi when the second supporting leg
Very little carpet supporting leg) when being connected to described leg body, big moment may apply from described carpet supporting leg
To described leg body.Described carpet supporting leg is connected to described leg body, in order to when described body weight is surveyed
When amount device is placed on the soft fabric of thick carpet, it is to avoid described leg body is embedded in soft fabric, makes
The base obtaining described body weigher contacts with described soft fabric, and therefore load is transmitted from described base
Problem to described soft fabric.
In the open No.2012-145389 of Japanese patent application, owing to the edge part of described supporting leg is fixed
In described base, therefore constrain the rotation of described edge part, when big moment is applied to described supporting leg master
Time on body, there is the situation that the deformation of described connecting portion makes described connecting portion be broken off greatly.But, although
Described edge part is not secured to described base, if retraining the rotation of described edge part, when moment is applied to
Time on described leg body, the deformation of described connecting portion is big so that described connecting portion is broken off.
Therefore, invent according to another, it is provided that a kind of load transducer and the body weight including this load transducer
Measurement apparatus, described body weigher includes supporting leg, and this supporting leg includes leg body, annular rim portion
With by described leg body and the connecting portion of described edge part at least one elastically deformable interconnective,
Wherein, when high-torque is applied to described leg body, the institute arranged around described leg body can be avoided
State the fracture of elastic joint part.
Embodiments of the present invention are as disclosed in following clause:
1. a load transducer (34), this load transducer (34) including:
At least one elastic component (36), this elastic component (36) deforms by being delivered to load thereon；
Multiple foil gauges (38), this foil gauge (38) be connected to described flexible element and produce in response to
The signal of the deformation of described flexible element；
At least one tie-beam (40), this tie-beam (40) supports described flexible element；And
At least one supporting leg (16), this supporting leg (16) is used for supporting described tie-beam, described tie-beam
Being connected to described supporting leg (16), wherein, described supporting leg includes cylindrical leg body (161), described
Tie-beam is arranged on described leg body (161)；The edge part (164) of annular, this edge part (164)
Arrange around described leg body；At least one elastic joint part (168), this elastic joint part (168)
Can elastic deformation and described leg body and described edge part are connected with each other；At least one first dash forward
Going out portion (170,171), this first protuberance (170,171) protrudes inwardly from from described edge part；With
And at least one second protuberance (172,173,174,175), this second protuberance (172,173,
174,175) it is integrally connected to described elastic joint part, and around the axis of described leg body in week
Upwards highlight from described elastic joint part, and adjacent with described first protuberance in the circumferential.At clause
In the present embodiment of 1, it is provided with at least one protruded inwardly from from described annular rim portion and first highlights
Portion and around the axis of described leg body in the circumferential from prominent at least one of described elastic joint part
Second protuberance.Described second protuberance is adjacent with described first protuberance in the circumferential.Therefore, even if
When the rotation of the axis around described edge part suffers restraints, high-torque is applied to described leg body simultaneously
Time, described first protuberance contacts each other with described second protuberance, in order to retrain described supporting leg
The rotation of main body, thus retrain the deformation of described elastic joint part, avoid whereby around described leg body
The fracture of the described elastic joint part arranged.
2. a load transducer (34), this load transducer (34) including:
At least one elastic component (36), this elastic component (36) deforms by being delivered to load thereon；
Multiple foil gauges (38), this foil gauge (38) be connected to described flexible element and produce in response to
The signal of the deformation of described flexible element；
At least one tie-beam (40), this tie-beam (40) supports described flexible element；And
At least one supporting leg (16), this supporting leg (16) is used for supporting described tie-beam, described tie-beam
Being connected to described supporting leg (16), wherein said supporting leg includes cylindrical leg body (161), described company
Connect beam to be arranged on described leg body (161)；The edge part (164) of annular, this edge part (164)
Arrange around described leg body；At least one elastic joint part (168), this elastic joint part (168)
Can elastic deformation and described leg body and described edge part are connected with each other；At least one first dash forward
Going out portion (170,171), this first protuberance (170,171) protrudes inwardly from from described edge part；With
And at least one second protuberance (172,173,174,175), this second protuberance (172,173,
174,175) contact with described first protuberance, in order to when active force is applied to institute in a circumferential direction
Suppression circumference active force when stating the leg body of annular.
3., according to the load transducer (34) described in clause 1 or 2, wherein, described elastic joint part is
Shaped form.
4. according to the load transducer (34) according to any one of clause 1-3, wherein, described supporting leg (16)
Including at least one protuberance (180,181), this protuberance (180,181) is convex from described first protuberance
Go out and insert in the through hole (404) of described tie-beam (40).In this case, described connection
Beam is restrained about the horizontal movement (linear motion and rotary motion) of the described edge part of described supporting leg.
It is, described edge part is about horizontal movement (linear motion and the rotary motion) quilt of described tie-beam
Constraint.In this case, if described supporting leg is not provided with described first protuberance and described second and dashes forward
Go out portion, it would be desirable to worry is when big moment is applied on described leg body, described elastic connection
Portion may fracture.But, according to the present embodiment of clause 4, even if be applied to described in big moment
Time on leg body, limit described supporting leg by the effect of described first protuberance and described second protuberance
Rotating and the deformation of described elastic joint part afterwards of main body, thus avoid around described leg body
The fracture of the described elastic joint part arranged.
5. a body weigher, this body weigher includes:
Platform (12), load is applied on this platform (12)；
According to the load transducer (34) according to any one of clause 1-4；And
Load-transmitting element (32), this load-transmitting element (32) be fixed on described platform and by load from
Described platform is delivered to described flexible element, and wherein, described flexible element is connected to described load-transmitting element, with
It is easy to the horizontal movement retraining described flexible element about described load-transmitting element, and described flexible element is fixed
In described tie-beam, described tie-beam is connected to the leg body of described supporting leg, in order to retrain described company
Connect the beam horizontal movement about described supporting leg.In this configuration, by described tie-beam, described flexibility
Part, described load-transmitting element and described platform constraints are around the rotation of the axis of described edge part.Therefore,
If described supporting leg is not provided with the first protuberance and the second protuberance, it would be desirable to worry is when big power
When square is applied on described leg body, described elastic joint part may fracture.But, according to clause 5
Embodiment, even if when big moment is applied on described leg body, by described first highlight
The effect of portion and described second protuberance limits rotating with described elasticity afterwards even of described leg body
Connect the deformation in portion, thus avoid the fracture of the described elastic joint part arranged around described leg body.
6., according to the body weigher described in clause 5, described body weigher also includes being connected to
Described platform and limit together with described platform accommodate space (27) base (15), described receiving
Space can accommodate the top of described supporting leg (16), described load-transmitting element (32), described flexible element,
Described foil gauge (38) and described tie-beam (40), described base includes base plate through holes (15a),
The bottom of the described leg body (161) of described supporting leg (16) by described base plate through holes from described appearance
Receive space towards described base downside highlight, wherein, described supporting leg is not secured to described base, therefore
Described base and described platform can be vertically arranged about described supporting leg.
The structure (a kind of structure being different from described embodiment) of described base it is fixed at described supporting leg
In, insert the described flexible element deformation between described supporting leg and described platform, execute from described platform with response
It is added to the load of described flexible element and is applied to the active force of described flexible element from described base.When load is executed
When being added on described platform, described base slight deformation, therefore it is applied to described flexible element from described base
Active force change, to respond the attitude of described base.Additionally, due to described flexible element is become by load
Shape so that described base and described supporting leg are pullled each other, and the load being therefore applied on described flexible element changes
Become.They make the certainty of measurement variation of the body weight measured by described body weigher.On the contrary,
In embodiment described by clause 6, described supporting leg in the case of being not secured to described base independent of
Described base, and described base and described platform be set together about described supporting leg, therefore inserts institute
State between supporting leg and described platform described flexible element deformation, with response from described platform be applied to described in scratch
Property the load of part and be applied to the active force of described flexible element from the ground placing described supporting leg.Even if it is local
When face is slightly tilted or described body weigher is slightly tilted about ground, also can ensure fully to pass through
The certainty of measurement of the body weight that described body weigher is measured.
7., according to the body weigher described in clause 5 or 6, described supporting leg is not secured to described platform
With any one in described base.
Claims (14)
1. a flexible element (36), this flexible element (36) is used for measuring the load transducer (34) of body weight,
Described flexible element (36) is deformed, described flexibility by the load that is delivered on described flexible element (36)
Part (36) is formed by powder metallurgy, and has the axisymmetric shape about the axis of symmetry with uniform
Thickness, described flexible element includes:
Rectangle strain region (361), this rectangle strain region (361) is arranged in described flexible element
Centre, upwardly extends in the side identical with the described axis of symmetry, and has the first end (361a) and second
End (361b)；
Two the first arms (362), these two first arms (362) are parallel to the described axis of symmetry and prolong
Stretch；
First connecting portion (363), this first connecting portion (363) is in the direction of the orthogonal described axis of symmetry
Upper extension and be connected to described first end in described first arm and described strain region；
Two the second arms (364), these two second arms (364) are set to than described first arm
Closer to described strain region, and it is parallel to the extension of the described axis of symmetry；And
Second connecting portion (365), this second connecting portion (365) is in the direction of the orthogonal described axis of symmetry
Upper extension and be connected to described second end in described second arm and described strain region,
Wherein, a pair in the second arm described in the first arm described in a pair and a pair is by along being perpendicular to institute
State the load on the direction of flexible element, and in the second arm described in the first arm described in a pair and a pair
Another is to being fixed on supporter,
It is characterized in that, the gap (G1) between described first arm and described second arm and described the
Gap (G2) between two arms and described strain region equals to or less than the one of the thickness of described flexible element
Half.
Flexible element the most according to claim 1 (36), wherein, described flexible element is by being pressed into
Type and sintering metal powder obtain.
Flexible element the most according to claim 1 (36), wherein, described flexible element is noted by metal
Penetrate molding to obtain.
Flexible element the most according to claim 1 (36), wherein, described flexible element is by being pressed into
Type and sintering at least include vanadium (V) and chromium (Cr) and mainly include the metal dust of ferrum (Fe)
Obtain.
Flexible element the most according to claim 4 (36), wherein, sintering metal is included by sintering
The metal dust of the chromium of 10.8% to 18.2% obtains.
Flexible element the most according to claim 4 (36), wherein, described sintering metal is by sintering
The metal dust of the vanadium including 0.1% to 0.5% obtains.
Flexible element the most according to claim 4 (36), wherein, described metal dust also includes carbon
(C)。
Flexible element the most according to claim 7 (36), wherein, described sintering metal is by sintering
The metal dust of the carbon including 0.5% to 1.8% obtains.
Flexible element the most according to claim 1 (36), wherein, described first arm is by along hanging down
Directly the load on the direction of described flexible element and described second arm are fixed on described supporter.
Flexible element the most according to claim 1 (36), wherein, each described first arm exists
Length (L1) on the direction of the axis of symmetry being perpendicular to described flexible element is that described strain region is orthogonal
1.3 times or more of length on the direction of the axis of symmetry of described flexible element.
11. flexible elements according to claim 1 (36), wherein, described first connecting portion is flat
Row length (L3) on the direction of the axis of symmetry of described flexible element is that described strain region is in orthogonal institute
1.4 times or more of length on the direction of the axis of symmetry stating flexible element.
12. flexible elements according to claim 1 (36), wherein, each described first arm sets
It is equipped with the first through hole (366).
13. flexible elements according to claim 1 (36), wherein, each described second arm sets
It is equipped with the second through hole (367).
14. 1 kinds of body weighers (1), this body weigher (1) including:
At least one flexible element according to claim 1 (36)；And
At least one load transducer (34), this load transducer (34) includes being connected to described flexibility
Part and produce multiple foil gauges (38) of signal in response to described flexible element deformation.
Applications Claiming Priority (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012211085 | 2012-09-25 | ||
| JP2012-211082 | 2012-09-25 | ||
| JP2012211082A JP5990816B2 (en) | 2012-09-25 | 2012-09-25 | Weight measuring device and load cell |
| JP2012211084A JP6035493B2 (en) | 2012-09-25 | 2012-09-25 | Load cell and weight measuring device |
| JP2012-211084 | 2012-09-25 | ||
| JP2012-211083 | 2012-09-25 | ||
| JP2012211083A JP6035492B2 (en) | 2012-09-25 | 2012-09-25 | Weight measuring device |
| JP2012-211085 | 2012-09-25 | ||
| JP2012277299A JP5275507B1 (en) | 2012-09-25 | 2012-12-19 | Strain body and weight measuring device |
| JP2012-277299 | 2012-12-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103674207A CN103674207A (en) | 2014-03-26 |
| CN103674207B true CN103674207B (en) | 2016-11-30 |
Family
ID=
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