CN109446680B - Method and device for optimally designing position of supporting pin of plate detection device - Google Patents
Method and device for optimally designing position of supporting pin of plate detection device Download PDFInfo
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Abstract
The invention provides a method and a device for optimizing the position of a supporting pin of a plate detection device. The support pin position optimization method is used for calculating the support pin coordinates when the maximum deformation of the plate model is minimum through modeling and finite element analysis and calculation; the supporting pin device can automatically change the position of the supporting pin according to a measurement and control program, and a supporting plane formed by two variable-position supporting pins and one fixed supporting pin is formed after the supporting pin is in place; the variable position locating pin is driven and located by the electromagnetic attraction device and the automatic locating device. The invention has the beneficial effects that the optimal design of the position of the supporting pin can effectively reduce the measurement error caused by the dead weight deformation of the plate, improve the supporting stability of the plate, improve the detection precision of the plate and solve the problems of larger flatness measurement error, easy instability and incapability of measurement caused by the deformation of the plate to be detected.
Description
Technical Field
The invention relates to the field of plate detection, in particular to a support pin position optimization design method and an automatic positioning device of a plate detection device.
Background
In the conventional plate detection standard, national standard GB/T3810.2-2016 is adopted, in the specified plate error parameter detection, the error parameter measurement process leads to systematic errors due to the fact that part of plate non-supporting ends hang down due to the specified supporting point positions, and measurement errors are formed due to the fact that compensation is difficult to solve the problems of materials, batches and the like, so that accuracy evaluation of flatness parameters is difficult, and plate instability is easy to cause.
The existing measuring equipment adopts surface support which does not meet national standard measurement standards, namely, the surface support is not three-point support, or the support position adopting national standard is not improved, for example, chinese patent application numbers 201610674777.5 and 2016106747760) discloses a support pin, the position of the support pin is strictly set according to the national standard regulation, and the movable support pin is manually changed in position, so that automatic change of the support position is not realized.
Disclosure of Invention
In order to solve the above problems, a first object of the present invention is to provide a method for optimizing the design of the position of a supporting pin of a plate detection device, which minimizes the measurement error caused by the self-weight deformation of the plate, and achieves a full-parameter measurement result by one-time sample injection measurement.
The second object of the invention is to provide an automatic positioning device for the supporting pin of the plate detection device based on the optimal design method, so as to realize automatic change of the supporting position and stable support of the plates with multiple specifications after being fed into the detection unit.
In order to achieve the above purpose, the invention adopts the following technical scheme: according to the actual situation, the support pins SA and SB are symmetrically placed along the central axis, the positions of the support pins are represented by parameterized coordinates, a solid mechanics formula in simulation software uses a parameter scanning method to calculate the functional relationship between the maximum self-weight deformation of the three-dimensional model and the support positions when different support pin positions are combined. And the optimal supporting pin position is calculated, and the stability of the plate support is improved by changing the position relation between the supporting pin and the gravity center. As shown in fig. 1, points 1, 2 and 3 are national standard specified plate detection supporting points, the gravity center O is positioned on the connecting line of the points 1 and 2, after the position of the supporting pin is changed, the gravity center is positioned in a triangle formed by three points SA, SB and SC, and the plate is supported more stably.
The invention adopts another technical scheme that: a supporting pin positioning device of a plate detection device comprises a supporting pin structural design, a supporting pin electromagnetic attraction device and a supporting pin automatic positioning device.
The supporting pin structure design comprises a fixed supporting pin I, a movable supporting pin II and a movable supporting pin III structure, and the supporting pin automatic positioning device comprises a supporting pin II automatic positioning device and a supporting pin III automatic positioning device. The support pins I and II adopt a cantilever type structural design, and the support pin III adopts a column type structural design.
As shown in fig. 6, the automatic positioning device of the supporting pin II and the automatic positioning device of the supporting pin III are installed on a horizontally placed platform, wherein the dotted line represents the platform, and the relative position is determined according to the method of optimizing the design of the supporting pin position.
The electromagnetic attraction device is arranged on the automatic positioning device of the supporting pin III, the automatic positioning device of the supporting pin III is separated from and connected with the supporting pin III through attraction and closing of the electromagnetic switch, and further the automatic positioning device of the supporting pin III provides power for positioning of the supporting pin III. After the supporting pin III is in place, the electromagnetic switch is powered to be attracted, the connecting pin is pulled out, the supporting pin III is separated from the electromagnetic attracting device, and the automatic positioning device of the supporting pin III withdraws to the original position so as to avoid blocking a sample from entering the supporting device; the automatic positioning device of the supporting pin II comprises a motor, a driver, a coupler, a screw rod seat and a screw rod platform; the automatic positioning device of the supporting pin III comprises a motor, a driver, a coupler, a screw rod seat, a screw rod platform and a connecting accessory connected with the electromagnetic attraction device.
The beneficial effects of the invention are as follows: the measurement of all parameters can be completed only by one sample injection positioning, so that the problem that the sample needs to be manually rotated for many times in the measurement of the error parameters of the plate according to the national standard is solved; according to the optimized supporting pin positions of different plates, the measuring error introduced by the plate self-weight deformation can be effectively improved, the supporting stability of the plates is improved, the plate detection precision is improved, and the problems that the measured plates are large in flatness measuring error, easy to unstably and even incapable of being measured due to deformation caused by the supporting point positions specified by the traditional national standard are solved; the power guide rail in the existing plate measuring system is utilized to provide power for positioning the supporting pin, so that mechanical interference caused by additional structure is avoided.
Drawings
FIG. 1 is a schematic view of parameterized coordinates and center of gravity of the plate support pins I, II, III of the present invention;
FIG. 2 is a schematic view of parameterized coordinates and center of gravity of another type of plate support pins I, II, III according to the present invention;
FIG. 3 is a graph showing the calculation results of the coordinate parameters a and b of the support pin III;
FIG. 4 is a graph showing the calculation results of the coordinate parameters c and d of the support pin I and the support pin II;
FIG. 5 is a flow chart of simulation of scanning of the position coordinate parameters of the support pins according to the present invention;
FIG. 6 is a schematic view of a pin positioning device of the plate inspection device of the present invention;
FIG. 7 is a schematic view of the supporting pin III, the automatic positioning device of the supporting pin III and the electromagnetic attraction device of the present invention;
wherein:
10. support for automatic positioning device of fixed support pin in automatic comprehensive plate measuring device
11. The support pin I is fixed and the support pin I is fixed,
12. movable supporting pin II
13. Movable supporting pin III
21. Automatic positioning device for supporting pin II
211. Motor 212, coupling 213, screw
214. Screw base 215 and screw platform
22. Automatic positioning device for supporting pin III
221. Motor 222, coupling 223, lead screw
224. Screw seat 225 and screw platform
31. Electromagnetic switch
32. Connecting pin
33. Connecting frame
34. Mounting plate
Detailed description of the preferred embodiments
The invention is described in further detail below with reference to the attached drawings and detailed description:
the design of the support pin position optimization method and the support device for automatically changing the position of the support pin based on the method comprise the steps of carrying out coordinate parameterization on the support pin, and solving the optimal support pin position by scanning the coordinate parameters in finite element simulation; the support pin structure design, the support pin electromagnetic attraction device and the support pin automatic positioning device. According to the method for optimizing the position of the supporting pin, the relative distance between the position of the supporting pin and the side edge of the plate when the maximum deviation of the plate self-weight deformation is minimum is designed and solved according to the flow shown in fig. 5; in fig. 1 and fig. 2, a and b are distances from the supporting pins III to the corresponding sides, c and d are distances from the supporting pins I and II to the corresponding sides, L and L1 are different plate side lengths, the side lengths are changed, and the a, b, c, d value is unchanged; the diagonal lines of the plates shown in fig. 1 and 2 are national standard specified supporting point connecting lines, the gravity center O is positioned on the connecting line of the point 1 and the point 2, and after the position of the supporting pin is changed, the gravity center is positioned in a triangle formed by three points SA, SB and SC, so that the plate support is more stable; fig. 3 and 4 show the calculation results of the support pin position optimization method, namely, the three-point support positions SA, SB and SC, and the maximum plate weight offset is minimum.
As shown in fig. 1, 6 and 7, according to the support pin position optimization method, the support pin I is fixed in position, the support pin II is fixed in position in the x direction, and can move in the y direction, and the support pin III is fixed in the y direction and can move in the x direction; the automatic positioning device for the supporting pin comprises an automatic positioning device 21 for the movable supporting pin II and an automatic positioning device 22 for the movable supporting pin III. The automatic positioning device of the supporting pin II comprises a motor 211, a coupler 212, a screw 213, a screw seat 214 and a screw platform 215; the automatic positioning device of the supporting pin III comprises a motor 221, a coupler 222, a screw 223, a screw seat 224 and a screw platform 225. The automatic positioning device for the supporting pins III can send the supporting pins III to a set position under the action of an automatic control system. The three support pins I, II and III are independent support pins and form a horizontal support plane. The supporting pin structure is designed according to the supporting position optimizing method, the supporting pin structure is supported to the optimized designed supporting position while not interfering other structures, the movable supporting pin ensures boards of different specifications, the supporting point positions of the supporting pin are fixed relative to the board edge, and the gravity center of the supporting pin is in a triangle formed by three supporting points.
As shown in fig. 7, the electromagnetic attraction device includes an electromagnetic switch 31, a connecting pin 32, a connecting frame 33, and a mounting plate 34. And the connecting pin penetrates through the mounting bracket and the reserved through hole of the supporting pin III.
Examples
The supporting device capable of automatically changing the position of the supporting pin comprises the following working steps:
firstly, determining the specification of a plate to be supported, and solving and calculating the optimal supporting pin position according to the size of the plate according to the flow shown in FIG. 5; the supporting pin automatic positioning device sends the supporting pins II and III to a proper position, the electromagnetic device is attracted, and the movable supporting pin III is separated from the automatic positioning device of the supporting pin III. And then the sample to be tested is sent into the supporting device, when the plate is positioned above the three supporting pins, the supporting device is lifted, and the supporting pins support the plate to enable the plate to be separated from the automatic sample feeding device.
The moveable support pin may remain in the existing position for continued support if the type of size of the push plate required is not altered. If the type of the pushing plate needs to be changed, the automatic positioning device of the supporting pin III is controlled to move to the supporting pin III, and the electromagnetic device is released to drive the supporting pin III to return to the initial position, namely the previous steps are repeated for pushing.
Claims (7)
1. The optimal design method for the position of the supporting pin of the plate detection device is characterized by comprising the following steps of:
step S1, respectively carrying out three-dimensional model modeling on boards with different specifications;
s2, performing network subdivision and finite element analysis simulation calculation on the three-dimensional model of the plate in the step S1;
step S3, carrying out parameterization scanning on the support pin coordinate parameters according to finite element analysis simulation calculation in the step S2, and solving an optimal coordinate position, namely, the support pin coordinate when the maximum deformation of the plate model is minimum;
and S4, calculating the coordinates of the support pins when the maximum deformation of the plate models with different specifications is minimum according to the step S1.
2. The method for optimally designing the position of the supporting pin of the plate detecting device according to claim 1, wherein the three-dimensional model is: the plate is square or rectangular aluminum, iron, steel, copper or ceramic.
3. The method for optimally designing the position of the supporting pin of the plate detection device according to claim 2, wherein the side length of the square or rectangular plate is 300mm-1000 mm.
4. The method for optimizing the design of the position of the supporting pin of the board detection device according to claim 1, wherein the finite element analysis simulation calculation method in step S2 comprises the following steps:
s201: selecting a plate model with one specification, selecting boundary conditions to scan four parameters of the position coordinates a, b, c, d of the supporting pins, wherein a and b are distances from the supporting pin III to the corresponding side, and c and d are distances from the supporting pins I and II to the corresponding side;
s202: drawing a three-dimensional curve between the maximum deformation and the support pin position coordinate parameters a, b, c, d according to the calculation result in the step S201;
s203: according to the three-dimensional curve in the step S202, the position coordinate value of the support pin when the maximum deformation is minimum, namely the optimal coordinate position is obtained;
s204: and selecting other specification plate models, and repeating the steps S202 and S203 to obtain the coordinate values of the positions of the supporting pins of the plates with various specifications, namely the optimal coordinate positions.
5. The method for optimizing the position of a support pin for a sheet material inspection apparatus according to claim 1, wherein the center of gravity of the sheet material is within a triangle formed by three support pin support points, based on the coordinates of the support pin at which the maximum deformation amount of the sheet material model is minimum.
6. An automatic positioning device for the method for optimizing the design of the position of the supporting pin of the plate material detecting device according to claim 1, comprising: supporting pin structure, supporting pin electromagnetism actuation device, supporting pin automation line location device, its characterized in that: the support pin structure comprises a fixed support pin I (11), a movable support pin II (12) and a movable support pin III (13); the fixed support pin I (11) and the movable support pin II (12) are cantilever type, and the movable support pin III (13) is a column type; the automatic positioning device of the supporting pin comprises an automatic positioning device (21) of a movable supporting pin II and an automatic positioning device (22) of the movable supporting pin III; the electromagnetic attraction device for the supporting pin comprises an electromagnetic switch (31), a connecting pin (32), a connecting frame (33) and a mounting plate (34), wherein the connecting pin (32) is connected with the electromagnetic switch (31), the connecting pin (32) penetrates through the connecting frame (33) and the movable supporting pin III to reserve through holes when the electromagnetic switch (31) is released, and the electromagnetic attraction device is fixed with an automatic positioning device (22) of the supporting pin III through bolts through the connecting frame (33); after the supporting pin III is in place, the electromagnetic switch (31) is powered to be attracted, the connecting pin (32) is pulled out, the supporting pin III is separated from the electromagnetic attracting device, and the automatic positioning device (23) of the supporting pin III withdraws to the original position to avoid blocking the sample to enter the supporting device.
7. The automatic positioning device for a support pin of a plate inspection device according to claim 6, wherein: the fixed support pins I and the movable support pins II and III are independent support pins and form a horizontal support plane.
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| CN201811305482.6A CN109446680B (en) | 2018-11-05 | 2018-11-05 | Method and device for optimally designing position of supporting pin of plate detection device |
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| CN201811305482.6A CN109446680B (en) | 2018-11-05 | 2018-11-05 | Method and device for optimally designing position of supporting pin of plate detection device |
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| CN109446680B true CN109446680B (en) | 2023-05-09 |
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| CN111889956B (en) * | 2020-06-23 | 2021-12-28 | 广州文冲船舶修造有限公司 | Large-area replacing and repairing process for top plate of cabin cover |
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| CN106202841A (en) * | 2016-08-30 | 2016-12-07 | 天津大学 | A kind of Optimization Design of bed piece supported at three point position |
| CN108287942A (en) * | 2017-12-26 | 2018-07-17 | 华中科技大学 | The optimum design method of the Whiffletree supporting point positions of the sub- mirror model of telescope primary mirror |
| CN108534669A (en) * | 2018-02-09 | 2018-09-14 | 中国科学院长春光学精密机械与物理研究所 | A method of optical element is detected using supported at three point |
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2018
- 2018-11-05 CN CN201811305482.6A patent/CN109446680B/en active Active
Patent Citations (8)
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| US6298572B1 (en) * | 2000-01-10 | 2001-10-09 | Mcauley Brian | Universal holding device for effectuating three dimensional measurement of a part and method of constructing such a holding device |
| CN2831044Y (en) * | 2005-08-23 | 2006-10-25 | 陈就 | Integrated error electronic test board for ceramic tile |
| CN103123253A (en) * | 2013-01-07 | 2013-05-29 | 西北工业大学 | Suspended detection holding device |
| CN103366043A (en) * | 2013-05-31 | 2013-10-23 | 天津大学 | Three-point support optimization design method of machine tool bed based on response surface model |
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