CN207570498U - A kind of active screw thread and profile scan device - Google Patents
A kind of active screw thread and profile scan device Download PDFInfo
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- CN207570498U CN207570498U CN201721672743.9U CN201721672743U CN207570498U CN 207570498 U CN207570498 U CN 207570498U CN 201721672743 U CN201721672743 U CN 201721672743U CN 207570498 U CN207570498 U CN 207570498U
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Abstract
The utility model provides a kind of active screw thread and profile scan device, including stylus, dynamometry feedback mechanism, horizontally disposed measuring staff, horizontal pull testing agency and kinematic system, the stylus is arranged on the dynamometry feedback mechanism, the dynamometry feedback mechanism is connect with the horizontal pull testing agency by the measuring staff, and the horizontal pull testing agency connect with the kinematic system.The beneficial effects of the utility model are：By adjusting dynamometry size in real time, dynamometry substantially constant in measurement process ensure that, and then the data for ensureing to measure more really reflect screw thread and contour surface；Improve in scanning process climbing, the descending problem, as stylus be detached from workpiece surface and stylus be stuck, damage situations such as；Improve sweep speed.
Description
Technical field
The utility model is related to a kind of active screw threads in measuring instrument more particularly to measuring instrument and profile scan to fill
It puts.
Background technology
During screw thread and profile measurement, measured with the method for stylus and measured surface contact scanning, stylus and quilt
The dynamometry surveyed between surface is an important factor for influencing screw thread and contour accuracy.During screw thread and profile scan, stylus effect
Dynamometry needs on measured workpiece surface are kept constant；Adjustment stylus position in time is needed at descending, ensures that stylus is not de-
From measured workpiece surface, locate very much the position for needing to adjust stylus in time suddenly in upward slope and the gradient, ensure that stylus will not be stuck.
In existing stylus and contour surface constant force sweeping scheme, majority is scanned for passive type, i.e., stylus is in vertical workpiece
Surface not active accommodation position, but passively adjusted with the concave-convex surface of scanning workpiece.The application of passive type scanning means
Force value is all theoretically constant：Such as constant force is generated using voice coil motor or other mechanical devices that can generate constant force
Value, is applied to using lever on stylus.The characteristics of passive type scanning means is that no complete feedback mechanism is scanned to adjust
Dynamometry in journey, dynamometry are not to adjust in real time.
Passive type scanning dynamometry in the rough workpiece of scanning of a surface can not keep really constant.It is thick in scanning
At the descending on rough surface, stylus can be temporarily disengaged from workpiece surface under the action of inertia, be connect again until under the action of dynamometry
Touch workpiece surface.At the upward slope of scanning rough surface, stylus is maintained at current location under the action of inertia, until level side
To draw high to stylus lifting force to continue to climb, in this process, be scanned workpiece surface dynamometry be not constant.
Existing passive type screw thread scanning means is primarily present following shortcoming：
(1) stylus is easy to wear.
(2) acme thread is scanned and heavy grade profile when phenomenon that occurs that dynamometry is bigger than normal or even stylus is stuck.
(3) meeting stylus is easily separated from surface when scanning acme thread and heavy grade profile, leads to measured data not
It can really reflect the shape of screw thread and big profile.
Invention content
In order to solve the problems in the prior art, the utility model provides a kind of active screw thread and profile scan dress
It puts.
The utility model provides a kind of active screw thread and profile scan device, including stylus, dynamometry feedback mechanism, water
Measuring staff, horizontal pull testing agency and the kinematic system of flat setting, the stylus is arranged on the dynamometry feedback mechanism, described
Dynamometry feedback mechanism is connect with the horizontal pull testing agency by the measuring staff, the horizontal pull testing agency with it is described
Kinematic system connects.
As further improvement of the utility model, the kinematic system includes measuring staff vertical axis kinematic system and water
Square to kinematic system, the horizontal pull testing agency with the measuring staff vertical axis kinematic system, the measuring staff hangs down
D-axis direction kinematic system is connect with the horizontal motion system.
As further improvement of the utility model, the dynamometry feedback mechanism includes the bullet that measuring staff vertical direction can be swung
Property device and the first displacement sensor for monitoring the elastic device deflection, the elastic device are connected to the survey
Between needle, measuring staff.
As further improvement of the utility model, the horizontal pull testing agency include horizontal direction elastic device,
Can detect tensile deformation second displacement sensor and restriction level direction elastic device deformation is led in only the horizontal direction
Rail, the horizontal direction elastic device are arranged on the guide rail, and the measuring staff is connect with the horizontal direction elastic device.
As further improvement of the utility model, the kinematic system includes measuring staff vertical axis kinematic system and water
Square to kinematic system, the measuring staff is connect with the measuring staff vertical axis kinematic system, the horizontal pull testing agency
It is connect with the horizontal motion system, the measuring staff is equipped with fulcrum, and the horizontal pull testing agency passes through the branch
Point and institute's measuring staff swing connection.
As further improvement of the utility model, one end of the measuring staff is connect with the dynamometry feedback mechanism, another
End is connect with the measuring staff vertical axis kinematic system.
As further improvement of the utility model, the dynamometry feedback mechanism includes elastic pendulum and can detect the bullet
Property pendulum deformation quantity the first displacement sensor, it is described elasticity pendulum be connected between the stylus, measuring staff.
As further improvement of the utility model, the horizontal pull testing agency include horizontal direction elastic device,
Can detect tensile deformation second displacement sensor and restriction level direction elastic device deformation is led in only the horizontal direction
Rail, the horizontal direction elastic device are arranged on the guide rail, and the horizontal direction elastic device passes through the fulcrum and institute
Measuring staff swings connection.
The beneficial effects of the utility model are：By adjusting dynamometry size in real time, it ensure that dynamometry is basic in measurement process
It is constant, and then the data for ensureing to measure more really reflect screw thread and contour surface；Improve climbing in scanning process, descending occurs
The problem of, situations such as being stuck, damage as stylus is detached from workpiece surface and stylus；Improve sweep speed.
Description of the drawings
Fig. 1 is stress diagram of the stylus on measured workpiece surface.
Fig. 2 is the dynamometry value of feedback restriction level axis movement of a kind of active screw thread of the utility model and profile scan device
Speed schematic diagram.
Fig. 3 is the horizontal pull restriction sweep speed signal of a kind of active screw thread of the utility model and profile scan device
Figure.
Fig. 4 is the schematic diagram of the embodiment one of a kind of active screw thread of the utility model and profile scan device.
Fig. 5 is the schematic diagram of the embodiment two of a kind of active screw thread of the utility model and profile scan device.
Specific embodiment
The utility model is described in further detail for explanation and specific embodiment below in conjunction with the accompanying drawings.
A kind of active screw thread and profile scan device with feedback fraction, the device include dynamometry feedback mechanism, water
Horizontal drawing tension detection mechanism, measuring staff vertical axis kinematic system and horizontal motion system.
The dynamometry feedback mechanism, stylus end devise the elastic device that a measuring staff vertical direction can swing and a set of
For monitoring the displacement sensor of elastic device deflection；The characteristics of mechanism, is that deformation quantity reflection stylus and workpiece can be utilized
Between dynamometry into specific relationship.
The horizontal pull testing agency, measuring staff horizontal direction are mounted with a set of slide bar, elastic device and displacement sensor,
The pulling force received in stylus horizontal direction can deform upon on elastic device, and slide bar defines that elastic device is only being parallel to measuring staff
Deformation on direction (horizontal direction), displacement sensor can monitor the deformation quantity in elastic device horizontal direction.The spy of the mechanism
Point is to reflect stylus by the pulling force in horizontal direction into specific relationship using deformation quantity.
It is described to be included perpendicular to measuring staff direction kinematic system：One executing agency with micron order kinematic accuracy, is used for
Perform the movement of measuring staff vertical axis and the displacement sensor of a detection amount of exercise.
The horizontal motion system includes：One movement executing mechanism, high-precision guide rail and can indicate amount of exercise
Displacement sensor.
The utility model provides two kinds of possible specific embodiments, but is not limited to both embodiments.
(1), embodiment one
As shown in figure 4, in dynamometry feedback mechanism 1 by elastic device 11 and the displacement sensing that elastic device deformation quantity can be detected
Device 12 forms.Stylus 4 is contacted with constant dynamometry N with screw thread 7 when normal scan, and miniature deformation can occur for elastic device 11,
Displacement sensor 12 can detect deformation quantity L.For stylus in horizontal plane, deformation quantity L is directly proportional to dynamometry N, coefficient k1,
Middle k1It is obtained by calibration.
There is a horizontal direction elastic device 21 in horizontal pull testing agency, can detect the displacement sensor 23 of tensile deformation,
And limit the guide rail 22 of the deformation in only the horizontal direction of elastic device 21.Frictional force between measuring staff 3 and guide rail 22 is very small, surveys
Needle can be reflected, and generate small tensile deformation, displacement sensor by the pulling force F of horizontal direction in elastic device 21 substantially
23 detect deformation quantity X.Variable X and stylus between by the pulling force F of horizontal direction relationship be：X=kxF, wherein kxPass through calibration
It obtains.
Vertical measuring staff direction kinematic system is made of Motor execution element 51, guide rail 52 and displacement sensor 53.Guide rail
52 be low-frictional force guide rail, displacement sensor 53 can vertical measuring staff direction amount of exercise.The Motion Resolution of Motor execution element 51
Rate is other in the micron-scale, and the movement of Motor execution element 51 can make dynamometry reduce (direction is just) or increase (direction is negative), right
The control in vertical measuring staff direction can realize the constant dynamometry contact workpiece surface of stylus.
Horizontal motion system is made of Motor execution element 61, guide rail 62 and displacement sensor 63, horizontal direction
Control can realize the scanning to screw thread.
(2), embodiment two
Fig. 5 is another specific embodiment of the utility model, dynamometry feedback mechanism and embodiment in the embodiment
One is identical, and dynamometry feedback mechanism 1 is made of elastic device 11 with the displacement sensor 12 that can detect elastic device deformation quantity.It is horizontal
Pull force calculation mechanism is also identical with embodiment one, there is a horizontal direction elastic device 21, can detect the displacement sensing of tensile deformation
Device 23 and the guide rail 22 for limiting the deformation in only the horizontal direction of elastic device 21.Horizontal motion system and one phase of embodiment
Together, it is made of Motor execution element 61, guide rail 62 and displacement sensor 63.
Unlike scheme one, the movement on measuring staff direction is realized by way of swing, on measuring staff 3
One fulcrum 8 is installed, Motor execution element 51 can be such that measuring staff is swung in certain low-angle.And remembered by displacement sensor 52
Record current position.
A kind of active screw thread and profile scan device provided by the utility model, for ensureing in scanning screw thread and profile
When, pulling force suffered by the dynamometry and stylus that monitor in real time and adjust stylus between tested screw thread and contour surface, with truer
Reaction screw thread and profile shape and solve scanning process in encounter the heavy grade such as coarse workpiece, acme thread, buttress thread
The problems such as surface measurement is not allowed, can not measure.
The utility model provides a kind of active screw thread and profile scan device, measures scanning process and includes two mainly
Content.
(1), the constant dynamometry of stylus follows workpiece control：According to the feedback data of dynamometry feedback mechanism, with higher frequency
Control speed and the direction of measuring staff vertical axis movement.
The substance that the constant dynamometry of stylus follows workpiece to control is controlled and is surveyed according to dynamometry feedback mechanism value of feedback
Movement in bar vertical direction.As shown in Figure 1, stylus measured workpiece surface gradient be θ angle sweeps when by vertically profiling table
The dynamometry N in face, the power can be decomposed into：The vertical active force G of pulling force F, stylus, and have following relationship：
G=Ncos θ
F=Nsin θ
The deformation quantity L of dynamometry feedback mechanism feedback is directly proportional to stylus institute stress value G, proportionality coefficient K1, which leads to
Calibration is crossed to obtain.In scanning process, constant scan dynamometry is set as N0, then dynamometry is N0When dynamometry feedback mechanism feedback quantity
For L0For：
L0=K1·N0·cosθ
L is kept for dynamometry feedback mechanism value of feedback0Near, it sets primary vertical every T periods (period is very short) control
In the direction of motion of the motor element in measuring staff direction and speed V.
Dynamometry feedback mechanism value of feedback L is more than L0When, the direction of motion perpendicular to the motor element in measuring staff direction is just
(dynamometry reduction direction), and set the movement velocity size of the executive component as：
V=k2·(L-L0)
K in formula2For proportionality coefficient, obtained by debugging.
Dynamometry feedback mechanism value of feedback L is less than L0When, the direction of motion perpendicular to the motor element in measuring staff direction is negative
(dynamometry augment direction), and set the movement velocity size of executive component as：
V=k3·(L0-L)
K in formula3For proportionality coefficient, obtained by debugging.
(2), horizontal sweep speed limits：When dynamometry value of feedback is not in setting range, attenuation even stops horizontal
The sweep speed in direction；Decay when horizontal pull testing agency is more than certain value and even stop the scanning speed of horizontal direction
Degree, while the vertical axis direction of motion reduces direction for dynamometry.
Horizontal movement is related to sweep speed, stylus protection situation, data validity etc. in screw thread and profile scan.This reality
With it is novel using dynamometry feedback mechanism and horizontal pull feedback mechanism come the motion conditions of restriction level axis.
The value of feedback of workpiece surface will be detached from as L by setting dynamometry feedback mechanism11, the value of feedback when minimum scans dynamometry
For L12, in maximum scan dynamometry, value of feedback is L21, and when dynamometry is excessive, value of feedback is L22；And have：
0<L11<L12<L0<L21<L22
Using the value of feedback of dynamometry feedback mechanism come the movement velocity of restriction level axis, can ensure that measure the constant of dynamometry and
As a result authenticity.As shown in Fig. 2, when dynamometry value of feedback L is in the range L 12 of setting<L<L21When interior, trunnion axis is to calculate
The sweep speed operation of target；When dynamometry feedback force value is less than L11 or more than L22When, horizontal sweep stops；When dynamometry is anti-
Feedback value is in L21<L<L22And L11<L<L12In the range of when, in proportion decay object run speed, to prevent dynamometry too small or survey
Power is excessive.
At sweep test special workpiece (such as 90 degree of workpiece surface part upward slope, cos θ=0), it is susceptible to stylus top
End is not exposed to workpiece, and vertical stylus direction value of feedback is smaller or is 0, and horizontal direction feedback output valve is larger, such as after
Continuous horizontal direction scanning, in fact it could happen that stylus is stuck phenomenon.
Horizontal pull feedback mechanism value is set as X, horizontal pull permissible value is X when normal scan0, judgement stylus is by card
Horizontal pull value of feedback is X when firmly1, have：0<X0<X1。
As shown in figure 3, when horizontal pull value of feedback is more than X0When, the movement of the Motor execution element of measuring staff vertical direction
Just (to be detached from workpiece surface direction), trunnion axis movement velocity is decayed to the very little speed of service in direction；When tension feedback value is big
In X1When, the direction of motion of the Motor execution element of measuring staff vertical direction stops horizontal just (to be detached from workpiece surface direction)
Axis moves, and stylus is avoided to be damaged.
A kind of active screw thread and profile scan device provided by the utility model have the characteristics that：
(1) the dynamometry feedback mechanism, stylus end devise the elastic device and one that a measuring staff vertical direction can be swung
Cover the displacement sensor for monitoring elastic device deflection；The characteristics of mechanism, is that deformation quantity reflection stylus and work can be utilized
Dynamometry is into specific relationship between part.
(2) it is described to be included perpendicular to measuring staff direction kinematic system：One executing agency with micron order kinematic accuracy, uses
In the movement for performing measuring staff vertical axis and the displacement sensor of a detection amount of exercise.
A kind of active screw thread and profile scan device provided by the utility model have the following advantages：
(1) adjustment dynamometry size, the data of measurement more really reflect screw thread and contour surface in real time.
(2) climbing, the descending problem in scanning process are improved, if stylus is detached from workpiece surface,
And stylus situations such as being stuck, damaging.
(3) sweep speed is improved.
The above content is combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, several simple deduction or replace can also be made, should all be regarded
To belong to the scope of protection of the utility model.
Claims (8)
1. a kind of active screw thread and profile scan device, it is characterised in that：Including stylus, dynamometry feedback mechanism, it is horizontally disposed with
Measuring staff, horizontal pull testing agency and kinematic system, the stylus is arranged on the dynamometry feedback mechanism, and the dynamometry is anti-
Feedback mechanism is connect with the horizontal pull testing agency by the measuring staff, the horizontal pull testing agency and the kinetic system
System connection.
2. active screw thread according to claim 1 and profile scan device, it is characterised in that：The kinematic system includes
Measuring staff vertical axis kinematic system and horizontal motion system, the horizontal pull testing agency and the measuring staff vertical axis
Direction kinematic system, the measuring staff vertical axis kinematic system are connect with the horizontal motion system.
3. active screw thread according to claim 2 and profile scan device, it is characterised in that：The dynamometry feedback mechanism
The elastic device that can be swung including measuring staff vertical direction and the first displacement sensor for monitoring the elastic device deflection,
The elastic device is connected between the stylus, measuring staff.
4. active screw thread according to claim 2 and profile scan device, it is characterised in that：The horizontal pull detection
Mechanism includes horizontal direction elastic device, the second displacement sensor that can detect tensile deformation and restriction level direction elasticity
The guide rail of device deformation in only the horizontal direction, the horizontal direction elastic device are arranged on the guide rail, the measuring staff and institute
State the connection of horizontal direction elastic device.
5. active screw thread according to claim 1 and profile scan device, it is characterised in that：The kinematic system includes
Measuring staff vertical axis kinematic system and horizontal motion system, the measuring staff and the measuring staff vertical axis kinematic system
Connection, the horizontal pull testing agency connect with the horizontal motion system, and the measuring staff is equipped with fulcrum, the water
Horizontal drawing tension detection mechanism is swung by the fulcrum and institute's measuring staff and connected.
6. active screw thread according to claim 5 and profile scan device, it is characterised in that：One end of the measuring staff with
The dynamometry feedback mechanism connection, the other end are connect with the measuring staff vertical axis kinematic system.
7. active screw thread according to claim 5 and profile scan device, it is characterised in that：The dynamometry feedback mechanism
Including elastic pendulum and the first displacement sensor that can detect the elastic pendulum deformation quantity, the elasticity pendulum is connected to described
Between stylus, measuring staff.
8. active screw thread according to claim 5 and profile scan device, it is characterised in that：The horizontal pull detection
Mechanism includes horizontal direction elastic device, the second displacement sensor that can detect tensile deformation and restriction level direction elasticity
The guide rail of device deformation in only the horizontal direction, the horizontal direction elastic device are arranged on the guide rail, the horizontal direction
Elastic device is swung by the fulcrum and institute's measuring staff and connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721672743.9U CN207570498U (en) | 2017-12-05 | 2017-12-05 | A kind of active screw thread and profile scan device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721672743.9U CN207570498U (en) | 2017-12-05 | 2017-12-05 | A kind of active screw thread and profile scan device |
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| Publication Number | Publication Date |
|---|---|
| CN207570498U true CN207570498U (en) | 2018-07-03 |
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ID=62690210
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| CN201721672743.9U Active CN207570498U (en) | 2017-12-05 | 2017-12-05 | A kind of active screw thread and profile scan device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976156A (en) * | 2017-12-05 | 2018-05-01 | 深圳市中图仪器股份有限公司 | A kind of active screw thread and profile scan device and method |
| CN117006998A (en) * | 2023-10-07 | 2023-11-07 | 深圳市中图仪器股份有限公司 | Scanning mechanism with protection system |
-
2017
- 2017-12-05 CN CN201721672743.9U patent/CN207570498U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107976156A (en) * | 2017-12-05 | 2018-05-01 | 深圳市中图仪器股份有限公司 | A kind of active screw thread and profile scan device and method |
| CN107976156B (en) * | 2017-12-05 | 2023-11-10 | 深圳市中图仪器股份有限公司 | Active thread and contour scanning device and method |
| CN117006998A (en) * | 2023-10-07 | 2023-11-07 | 深圳市中图仪器股份有限公司 | Scanning mechanism with protection system |
| CN117006998B (en) * | 2023-10-07 | 2024-01-16 | 深圳市中图仪器股份有限公司 | Scanning mechanism with protection system |
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