CN207019827U - A kind of force cell - Google Patents
A kind of force cell Download PDFInfo
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- CN207019827U CN207019827U CN201720884778.2U CN201720884778U CN207019827U CN 207019827 U CN207019827 U CN 207019827U CN 201720884778 U CN201720884778 U CN 201720884778U CN 207019827 U CN207019827 U CN 207019827U
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- cantilever beam
- otic placode
- load frame
- connection otic
- force cell
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- 239000011888 foil Substances 0.000 claims abstract description 16
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- 230000002153 concerted effect Effects 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 2
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
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- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
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Abstract
A kind of force cell, belong to dynameter technical field.Its one end sets connecting plate, sets four mounting holes on connecting plate, is connected it with equipment crossbeam to be measured with U-bolt；The other end sets connection otic placode, for connecting tractor link, it is load frame between connecting plate and connection otic placode, the load frame is the hollow frame structure in middle part, and carry gap close to the side of connection otic placode in load frame, separate upper and lower two parts, upper cantilever beam is formed at top, and Analysis of A Cantilever Beam Under is formed at bottom；Gap between upper and lower cantilever beam is the fluted body structure with flanging.The dynamometry portion l-shaped structure of force cell described in the utility model, it is the fluted body gap with flanging between the upper and lower cantilever beam of its load frame, prevents load frame to be damaged.In dynamometry, according to the situation for specifically needing test force, foil gauge is pasted in relevant position.Overall structure meets the bearing capacity of load frame, within allowable stress range, ensures measurement accuracy, prevents load frame to be damaged.
Description
Technical field
The invention belongs to dynameter technical field, more particularly to a kind of force cell.
Background technology
At present, by research, measured object caused load in actual use is determined using force cell.Example
Such as, all directions pulling force etc. is measured to agricultural tool.To detect the size of agricultural tool required pulling force when in use, it is suitable to be equipped with
Tractive force.Existing device for measuring force uses octagonal ring or combined beam structure more, and angular surveying is carried out using multiple angular transducers,
Structure is cumbersome, adds cost.
The utility model patent of Patent No. 201520698859.4, disclose a kind of tractor suspension tilling depth that is used for and control
Draft sensing mechanism, including upper connecting rod, lower pull bar, dynamometer spring, spring static housing, spring base, tooth fan, little gear with
And angular displacement sensor, by the installing force sensing mechanism on upper connecting rod, the power on upper connecting rod is transmitted to tooth fan, gear enlarger
Structure, so as to which displacement is converted into angular metric, realize the power sensing control of hitch；Pass through the setting angle on lift arm
Sensor, realize the comprehensive adjustment of tilling depth.But its drive mechanism is complicated, using high with maintenance cost, and can not detect each
Make a concerted effort on direction.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of force cell, and two are used in dynamometric system
Force cell of the present invention, with unification angular transducer, only it need to measure an angle, you can draw agricultural machinery and implement all directions
Pulling force.
The purpose of the present invention is achieved through the following technical solutions：
A kind of force cell of the present invention, connecting plate is set in its one end, for being connected with equipment to be measured, the other end is set
Connection otic placode, is load frame for connecting the pull bar of tractor, between connecting plate and connection otic placode, and the load frame is that middle part is hollow
Frame structure, and carry gap close to the side of connection otic placode in load frame, make two parts separation up and down, top forms outstanding
Analysis of A Cantilever Beam Under is formed at arm beam, bottom；Gap between upper and lower cantilever beam is the fluted body structure with flanging.
A kind of dynamometry mode of the present invention, in dynamometry, two groups are respectively symmetrically set in the connection otic placode upper and lower surface
Foil gauge R1、R2And R3、R4；Upper cantilever top surface of the beam and bottom surface respectively symmetrically set two groups of foil gauge R5、R6And R7、R8, overlap joint helps
Bridge circuit, data wire connect computer respectively by straining amplification and data acquisition device.
The present invention another dynamometry mode, in dynamometry, the connection otic placode correspond to upper cantilever beam side and its
Close upper cantilever beam inside casing respectively symmetrically sets two groups of foil gauge R9、R10And R11、R12, upper cantilever top surface of the beam and bottom surface are distinguished
It is symmetrical arranged two groups of foil gauge R5、R6And R7、R8, full-bridge circuit is overlapped to form, data wire is by straining amplification and data acquisition device
Computer is connected respectively.
Further, the gap x of the upper and lower cantilever beam vertically is horizontally tracting resistance and vertical direction power
With joint efforts to the deflection value sum of cantilever beam end A points.
Further, circular arc through hole, built-in steel are provided with the matrix groove sidewall of the upper cantilever beam end A points
Muscle, and reinforcing bar external diameter protrudes the circular arc through hole border, its projection maximum length is less than the gap x between upper Analysis of A Cantilever Beam Under,
To adjust the maximum overload protection value of load frame.
Further, the vertical Y direction height h of the connection otic placode1For 3-5 times of connection pore radius r be provided with thereon,
I.e.：h1=(3-5) r.
Further, the connection otic placode is along horizontal Z-direction widthObtained by following equation:
Wherein：Fy：Using power of the connecting hole center as origin vertically, σ1：FyRelative to connection otic placode
Root vertical section M1 stress, l1：FyTo section M1 distance, h1：Connection otic placode vertical direction height；
Wherein σ1Less than or equal to σPerhaps, thenTake σ1Close to σPerhaps, you can draw b1。
Further, the upper cantilever top surface of the beam is to the height h between bottom surface2, obtained by following equation:
Wherein σ2Less than or equal to σPerhaps, thenl2For connection centerline hole to section M2 away from
From；Given Fy、l2、b2And σPerhaps, wherein load frame is along horizontal Z-direction width b2=b1+b0, wherein b0Between two connection otic placodes
Distance, you can determine h2。
Beneficial effects of the present invention are：
The dynamometry portion l-shaped structure of force cell of the present invention, it is band flanging between the upper and lower cantilever beam of its load frame
Fluted body gap, the gap x vertically coordinated is that horizontally tracting resistance and vertical direction power are made a concerted effort to cantilever beam end
The deflection value sum of A points is held, prevents load frame to be damaged.In dynamometry, respectively symmetrically set in the connection otic placode upper and lower surface
Two groups of foil gauges, prevent unbalance stress；Two groups of foil gauges are respectively symmetrically set in the upper cantilever top surface of the beam and bottom surface, formed complete
Bridge force measuring structure, when there are lateral forces, do not influence measurement result；Its h2With the determination of l length, in order to meet load frame
Bearing capacity, proof stress ensure measurement accuracy, prevent load frame to be damaged within allowable stress range.
Brief description of the drawings
Fig. 1 is the application structure schematic diagram of the present invention.
Fig. 2 is the dimensional structure diagram of force cell in the present invention.
Fig. 3 is Fig. 2 force cell front view.
Fig. 4 is Fig. 3 I portions enlarged diagram.
Fig. 5 is Fig. 3 top view.
Fig. 6 is the strain gauge adhesion schematic diagram of embodiment 1.
Fig. 7 is the strain gauge adhesion schematic diagram of embodiment 2
Each hardware that Fig. 8 is the present invention connects block diagram.
In figure：1. hanger bracket, 2. pulling force sensors, 3. angular transducers, 4. upper connecting rods, 5. links, connect on 51.
Bar, 52. crossbeams, 6. force cells I, 61. connection otic placodes, 62. connecting holes, 63. inclined-planes, 64. upper cantilever beams, 65. connecting plates,
66. Analysis of A Cantilever Beam Under, 67. through holes, 68. gaps, 7. force cells II, 8. times pull bars.
Embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
Embodiment 1：As shown in figure 1, a kind of force cell of the present invention, for suspension type space dynamometric system, the dynamometry
System uses two force cells of the invention, respectively force cell I 6 and force cell II 7, the dynamometric system bag
Include：
Upper connecting rod 4, is connected in series pulling force sensor 2 and angular transducer 3 thereon, and one end of connection pulling force sensor 2 connects
The upper suspension of tractor hanger bracket 1 is connected to, the other end connects the node of upper connecting rod 51 of equipment link 5 to be measured；
Lower pull bar 8, it is two, the lower suspension of one end connection tractor hanger bracket 1, the other end connects force cell respectively
I 6 and force cell II 7, two force cells the crossbeam 52 of equipment to be measured is all connected with by U-bolt；
Pulling force sensor 2, the force cell I 6, II 7 of angular transducer 3 and two are respectively by straining magnification circuit plate, number
Computer is connected according to collector, is calculated by computer and shows that all directions are made a concerted effort.
As shown in figure 8, the signal wire of the force cell I 6 and force cell II 7 connects foil gauge amplification electricity respectively
Road plate I, the signal wire connection foil gauge magnification circuit plate II of pulling force sensor, two foil gauge magnification circuit plates I and II it is defeated
Go out signal wire and computer is connected by data acquisition unit respectively.Battery is powered to angular transducer, and data acquisition unit is to strain
Piece amplification board provides supply voltage.
As Figure 2-Figure 5, the force cell I 6 is identical with the structure of force cell II 7, is symmetrical arranged, now with survey
Its structure is described in detail exemplified by force snesor I 6：Described one end of force cell I 6 sets connecting plate 65, on connecting plate
Four mounting holes are set, and for being connected by U-bolt with equipment to be measured, the other end sets connection otic placode 61, under connection
Pull bar, it is load frame between connecting plate 65 and connection otic placode 61, the load frame is the hollow frame structure in middle part, and in load frame
Gap 67 is carried close to the side of connection otic placode 61, separates upper and lower two parts, upper cantilever beam 64 is formed at top, and bottom is formed
Analysis of A Cantilever Beam Under 66；Gap 67 between upper and lower cantilever beam 64,66 is the fluted body structure with flanging, makes upper cantilever beam 64 and connection
The dynamometry portion that otic placode 61 forms forms L-type structure.
As shown in fig. 6, during dynamometry, two groups of strain transducers are respectively symmetrically set in the upper and lower surface of connection otic placode 61,
Respectively R1、R2And R3、R4, prevent discontinuity；The top surface of upper cantilever beam 64 and bottom surface respectively symmetrically set two groups of strain sensings
Device, difference R5、R6And R7、R8, full-bridge connection is formed, when there is lateral forces, does not influence measurement result, each strain transducer
Computer is connected by data acquisition unit.
As shown in Figure 3, Figure 4, the gap x that the upper and lower cantilever beam 64,66 vertically coordinates is horizontally tracting resistance
With the deflection value sum made a concerted effort to cantilever beam end A points of vertical direction power, this example gap x is 1mm.Close to the upper cantilever beam
Circular arc through hole 68, built-in reinforcing bar, and reinforcing bar external diameter, which are provided with, in the matrix groove sidewall of 64 end A points protrudes the circular arc through hole 68
Border, its projection maximum length be less than upper and lower cantilever beam 64,66 between gap x, to adjust the maximum overload of load frame
Protection value.
The vertical Y direction height h of connection otic placode 61 described in this example1For the 3-5 for the radius r of connecting hole 62 being provided with thereon
Times, i.e.,：h1=(3-5) r.R is 12mm in this example, takes h1=3r=36mm；
The connection otic placode 61 is along horizontal Z-direction widthObtained by following equation:
Wherein：Fy：Using power of the connecting hole center as origin vertically, this example takes Fy=5000N；σ1：
FyRelative to connection otic placode root vertical section M1 stress, l1：FyTo section M1 distance, this example takes l1=50mm；h1：Connection
Otic placode vertical direction height, is obtained：
Wherein σ1Less than or equal to σPerhaps(σPerhapsTake the allowable stress 120MPa of No. 45 steel), thenTake σ1
Close to σPerhaps, you can draw
This example takes b1=20mm, load frame is along horizontal Z-direction width b2=b1+b0, wherein b0Between two connection otic placodes 61
Distance, determined with the tip width of lower pull bar 8 that is connected, this example 35mm, obtain b2=b1+b0=55mm；
The top surface of upper cantilever beam 64 is to the height h between bottom surface2, obtained by following equation:The FyLoad inframe frame is leaned on
Stress caused by the vertical section M2 of nearly connecting plate 65：
Wherein σ2Less than or equal to σPerhaps, thenl2For the center line of connecting hole 62 to section M2Away from
From；This example gives Fy=5000N, l2=100mm, b2=55mm and σPerhaps=120MPa, you can it is determined thatThis example takes h2=25mm, meet dynamometry requirement.
When in use, the measuring method of the computer is as follows for the dynamometric system：
The first step：The fixed known load of loading, demarcates each pulling force sensor and angular transducer；
Second step：Zeroing, carry out initial calibration during no-load；
3rd step：Start, input basic parameter, including upper and lower pull bar length and its locus, each sensor letter
Breath --- 4 groups of strain transducers, angular transducer and pulling force sensor；
4th step：Tested, while receive the signal that each sensor measures；
5th step：The data measured according to each sensor, determine according to the synthesis of Vector modulation theorem and make a concerted effort on direction；
According to the actual requirements, the different angle of angular transducer input, obtain making a concerted effort on different directions；
6th step：Judge σ1、σ2Whether more than σPerhaps, such as exceed, then alarm, be no more than, continue 1-6 pacings examination.
Embodiment 2：This example is as different from Example 1：As shown in fig. 6, this example is in dynamometry, in the connection otic placode 61
The side of corresponding upper cantilever beam 64 and its close upper cantilever beam inside casing respectively symmetrically set two groups of foil gauge R9、R10And R11、
R12, the top surface of upper cantilever beam 64 and bottom surface respectively symmetrically set two groups of foil gauge R5、R6And R7、R8, each strain transducer passes through data
Collector connects computer respectively.Its method of testing is same as Example 1.
The vertical Y direction height h of connection otic placode 611For 3-5 times of the radius r of connecting hole 62 be provided with thereon, i.e.,：h1
=(3-5) r.R is 12mm in this example, takes h1=4r=48mm；
The connection otic placode 61 is along horizontal Z-direction widthObtained by following equation:
Wherein：Fy：Using power of the connecting hole center as origin vertically, this example takes Fy=10000N；σ1：
FyRelative to connection otic placode root vertical section M1 stress, l1：FyTo section M1 distance, this example takes l1=50mm；h1：Connection
Otic placode vertical direction height, is obtained：
Wherein σ1Less than or equal to σPerhaps, thenTake σ1Close to σPerhaps, you can draw
This example takes b1=20mm, load frame is along horizontal Z-direction width b2=b1+b0, wherein b0Between two connection otic placodes 61
Distance, determined by the tip width of pull bar 8 under the tractor that is connected, this example 35mm, obtain b2=b1+b0=55mm.
The top surface of upper cantilever beam 64 is to the height h between inside casing2, obtained by following equation:The FyLoad inframe frame is leaned on
Stress caused by the vertical section M2 of nearly connecting plate 65：
Wherein σ2Less than or equal to σPerhaps, thenl2For the center line of connecting hole 62 to section M2Away from
From；This example gives Fy=10000N, l2=100mm, b2=55mm and σPerhaps=120MPa, you can it is determined thatThis example takes h2=40mm, meet dynamometry requirement.
Embodiment 3：This example is as different from Example 1：The vertical Y direction height h of connection otic placode 611To open thereon
3-5 times of some radius r of connecting hole 62, i.e.,：h1=(3-5) r.R is 12mm in this example, takes h1=5r=60mm；
The connection otic placode 61 is along horizontal Z-direction widthObtained by following equation:
Wherein：Fy：Using power of the connecting hole center as origin vertically, this example takes Fy=8000N；σ1：
FyRelative to connection otic placode root vertical section M1 stress, l1：FyTo section M1 distance, this example takes l1=60mm；h1：Connection
Otic placode vertical direction height, is obtained：
Wherein σ1Less than or equal to σPerhaps, thenTake σ1Close to σPerhaps, you can draw
This example takes b1=15mm, load frame is along horizontal Z-direction width b2=b1+b0, wherein b0Between two connection otic placodes 61
Distance, determined by the tip width of pull bar 8 under the tractor that is connected, be 35mm, obtain b2=b1+b0=50mm.
The top surface of upper cantilever beam 64 is to the height h between inside casing2, obtained by following equation:The FyLoad inframe frame is leaned on
Stress caused by the vertical section M2 of nearly connecting plate 65：
Wherein σ2Less than or equal to σPerhaps, thenl2For the center line of connecting hole 62 to section M2Away from
From；This example gives Fy=8000N, l2=110mm, b2=50mm and σPerhaps=120MPa, you can it is determined thatThis example takes h2=40mm, meet dynamometry requirement.
Claims (6)
- A kind of 1. force cell, it is characterised in that：Its one end sets connecting plate, and for connecting equipment to be measured, the other end is set Connection otic placode, is load frame for connecting tractor link, between connecting plate and connection otic placode, and the load frame is that middle part is hollow Frame structure, and gap is carried close to the side of connection otic placode in load frame, make two parts separation up and down, upper cantilever is formed at top Analysis of A Cantilever Beam Under is formed at beam, bottom；Gap between upper and lower cantilever beam is the fluted body structure with flanging.
- 2. force cell according to claim 1, it is characterised in that：Respectively symmetrically set in the connection otic placode upper and lower surface Put two groups of foil gauge R1、R2And R3、R4；Upper cantilever top surface of the beam and bottom surface respectively symmetrically set two groups of foil gauge R5、R6And R7、R8, take Full-bridge circuit is connected into, data wire connects computer by straining amplification and data acquisition device, carries out dynamometry respectively.
- 3. force cell according to claim 1, it is characterised in that：The side of upper cantilever beam is corresponded in the connection otic placode And its close upper cantilever beam inside casing respectively symmetrically sets two groups of foil gauge R9、R10And R11、R12, upper cantilever top surface of the beam and bottom surface Two groups of foil gauge R are respectively symmetrically set5、R6And R7、R8, full-bridge circuit is overlapped to form, data wire is by straining amplification and data acquisition Device connects computer respectively, carries out dynamometry.
- 4. force cell according to claim 1, it is characterised in that：The gap x of the upper and lower cantilever beam vertically For horizontally tracting resistance and the deflection value sum made a concerted effort to cantilever beam end A points of vertical direction power.
- 5. force cell according to claim 1, it is characterised in that：Close to the concave groove of the upper cantilever beam end A points Circular arc through hole, built-in reinforcing bar, and reinforcing bar external diameter are provided with side wall and protrudes the circular arc through hole border, its projection most greatly enhances Degree is less than the gap x between upper Analysis of A Cantilever Beam Under, to adjust the maximum overload protection value of load frame.
- 6. force cell according to claim 1, it is characterised in that：It is characterized in that：The vertical Y-axis side of connection otic placode To height h1For 3-5 times of connection pore radius r be provided with thereon, i.e.,：h1=(3-5) r.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720884778.2U CN207019827U (en) | 2017-07-20 | 2017-07-20 | A kind of force cell |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720884778.2U CN207019827U (en) | 2017-07-20 | 2017-07-20 | A kind of force cell |
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| CN207019827U true CN207019827U (en) | 2018-02-16 |
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| CN201720884778.2U Expired - Fee Related CN207019827U (en) | 2017-07-20 | 2017-07-20 | A kind of force cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402100A (en) * | 2017-07-20 | 2017-11-28 | 沈阳农业大学 | A kind of force cell |
| CN116989876A (en) * | 2023-07-27 | 2023-11-03 | 中山精量衡器制造有限公司 | Weighing device with overload protection function |
-
2017
- 2017-07-20 CN CN201720884778.2U patent/CN207019827U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107402100A (en) * | 2017-07-20 | 2017-11-28 | 沈阳农业大学 | A kind of force cell |
| CN107402100B (en) * | 2017-07-20 | 2024-03-12 | 沈阳农业大学 | Force transducer |
| CN116989876A (en) * | 2023-07-27 | 2023-11-03 | 中山精量衡器制造有限公司 | Weighing device with overload protection function |
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Granted publication date: 20180216 |