Metal medium-thrust intelligent dynamic calibration gauge based on multi-dimensional laser scanning

Abstract

The invention provides a metal medium-thrust intelligent dynamic calibration gauge based on multi-dimensional laser scanning, and relates to the field of calibration gauges. The device comprises a workpiece containing base and a workpiece positioning assembly installed in the workpiece containing base and used for positioning a metal part. The workpiece positioning assembly comprises a plurality of positioning columns which penetrate through the top of the workpiece containing base and are distributed in an array mode, annular grooves are formed in the connecting positions of the positioning columns and the workpiece containing base, and miniature grating rulers are arranged on the side portions of the annular grooves. The positioning columns and the micro grating rulers are combined into the sensor array, three-dimensional point cloud data of the bottom face of the workpiece are directly obtained, the data and upper surface data collected by the laser scanning device are fused in a unified coordinate system, contour information of the surface of the workpiece can be rapidly and actively obtained, and three-dimensional space attitude data of the workpiece are obtained. Compared with the mode that the laser scanning equipment needs to be mechanically adjusted in the three-dimensional direction to achieve inspection of the metal workpiece, the efficiency is higher.

Description

Technical Field

[0001] This invention relates to the field of calibration fixtures, specifically a metal-based intelligent dynamic calibration fixture based on multi-dimensional laser scanning. Background Technology

[0002] In today's highly automated manufacturing industry, metal stampings, castings, and precision machined parts serve as core basic components, widely used in the automotive, aerospace, precision instrument, and high-end equipment industries. The stability and consistency of the processing quality of these workpieces, especially the "intermediate push parts" (i.e., semi-finished products bridging upstream and downstream processes) in intermediate manufacturing steps, directly determine the performance, reliability, and safety of the final product. Therefore, rapid, accurate, and efficient dimensional inspection and dynamic calibration of these metal workpieces during production has become an indispensable key link in modern intelligent manufacturing.

[0003] Currently, the industry generally uses the following two types of inspection tools: 1. Dedicated Inspection Fixtures: Dedicated inspection fixtures are fixed physical tools designed and manufactured based on the ideal three-dimensional digital model (CAD) of a specific workpiece, such as inspection calipers, go / no-go gauges, dedicated clamps, and inspection tools. These fixtures are usually operated manually by experienced technicians. By physically fitting the fixture to the workpiece, they rely on a binary judgment of "pass / fail" or feeler gauge measurement to check whether key dimensions and geometric tolerances are within the allowable range. Their advantages are fast inspection speed, intuitive operation, and relatively low cost. However, their drawbacks are also quite obvious: one fixture can only correspond to one specific workpiece or a series of specific workpieces; once the product design changes, the original dedicated fixture immediately becomes invalid and needs to be redesigned; dedicated fixtures usually only provide qualitative conclusions of "pass" or "fail," and cannot provide quantitative, continuous deviation data; for workpieces with complex structures, dedicated fixtures are often structurally complex and inconvenient to operate. 2. Coordinate Measuring Machine (CMM): A CMM moves a probe in three directions to contact the workpiece surface and collect the spatial coordinates of the points. Software then calculates the workpiece's dimensions and geometric tolerances. Its greatest advantage lies in its extremely high measurement accuracy and strong versatility. However, CMM measurements typically require a constant temperature and humidity precision metrology chamber, making it an "offline inspection." The workpiece needs to be removed from the production line, transported, and awaited measurement. The entire process is time-consuming, cannot reflect the instantaneous state of the production line in real time, and is significantly lagging behind the production cycle. It cannot achieve 100% full inspection. Furthermore, trigger-based measurements are inefficient, and while scanning probes can acquire more data, their speed is still slower than optical measurements, and there is a risk of deformation of thin-walled parts due to probe contact force.

[0004] In summary, the field of online inspection of metal workpieces currently faces severe challenges: specialized inspection tools cannot adapt to flexible production, and coordinate measuring machines cannot meet the pace of online inspection. Summary of the Invention

[0005] The purpose of this invention is to provide a metal-based intelligent dynamic calibration fixture based on multi-dimensional laser scanning to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a metal push intelligent dynamic calibration fixture based on multi-dimensional laser scanning, comprising a workpiece placement base, a workpiece positioning component installed inside the workpiece placement base for positioning the metal part, a laser detection component installed above the workpiece placement base for laser scanning; and a locking component disposed on the side of the workpiece placement base for locking the workpiece positioning component. The workpiece positioning component includes: multiple positioning columns arranged in an array through the top of the workpiece placement base, an annular groove is provided at the connection between the positioning column and the workpiece placement base, and a micro grating ruler is provided on the side of the annular groove. A support column is welded above the workpiece placement base, and a measuring bracket is welded to the top of the support column. The laser detection assembly includes: a laser scanning device that is slidably mounted on the bottom of the measuring bracket; The locking assembly includes: clamping airbags installed around the positioning post, and an air inlet pipe is provided between the three clamping airbags.

[0007] As a further embodiment of the present invention: the workpiece positioning assembly further includes: a positioning plate fixed inside the workpiece placement base, the positioning column passing through the interior of the positioning plate, and a limit plate welded to the bottom of the positioning column.

[0008] As a further embodiment of the present invention: the workpiece positioning assembly further includes: a return spring fixed to the bottom of the limiting plate, wherein a telescopic outer rod is installed inside the return spring, and a telescopic inner rod is movably inserted inside the telescopic outer rod, and the connection between the telescopic inner rod and the telescopic outer rod is filled with hydraulic oil.

[0009] As a further embodiment of the present invention: a guide sleeve is fixed to the bottom of the positioning plate, the positioning post passes through the inside of the guide sleeve, and the clamping airbag is installed inside the guide sleeve.

[0010] As a further aspect of the present invention: the positioning post has a hollow structure, and a negative pressure hole is provided at the top of the positioning post.

[0011] As a further embodiment of the present invention, the locking assembly further includes a filter box disposed on the side of the workpiece placement base, wherein the side of the filter box is connected to a forward and reverse fan via a pipe.

[0012] As a further embodiment of the present invention: a connecting pipe is provided between the filter box, the positioning column, and the clamping airbag; one of the connecting pipes is equipped with a first solenoid valve, which is installed on the connecting pipe between the filter box and the positioning column; the other connecting pipe is equipped with a second solenoid valve, which is installed on the connecting pipe between the filter box and the clamping airbag.

[0013] As a further embodiment of the present invention, the locking assembly further includes: a first filter plate, a second filter plate, and a third filter plate that are detachably installed inside the filter box, wherein the first filter plate, the second filter plate, and the third filter plate are distributed sequentially from left to right, and a sealed door is provided at the front end of the filter box to facilitate the replacement of the first filter plate, the second filter plate, and the third filter plate inside.

[0014] As a further embodiment of the present invention: the laser detection assembly further includes: two guide brackets installed on the bottom end face of the measuring bracket, a crossbar is provided between the two guide brackets, a longitudinal rod is slidably connected to the lower part of the crossbar through a threaded sleeve, and a transmission screw is rotatably connected inside both the longitudinal rod and the crossbar, a transverse motor is fixed to the end of one of the transmission screws, a longitudinal motor is fixed to the end of the other transmission screw, and the laser scanning device is slidably connected to the lower part of the longitudinal rod through a threaded sleeve.

[0015] As a further embodiment of the present invention: the measuring bracket is provided with a control component, which is electrically connected to a horizontal motor, a vertical motor, a forward and reverse fan, a first solenoid valve, a second solenoid valve and a miniature grating ruler, and a reference ball is installed at the four corners of the end of the workpiece placement base.

[0016] Compared with the prior art, the beneficial effects of the present invention include: 1. The present invention uses a workpiece positioning component based on multiple positioning columns arranged in an array. It can automatically adapt to metal workpieces of different shapes and sizes without replacing any parts. Taking a 16×16 positioning column array as an example, it can provide 256 independent support points, realizing "one tool for multiple uses". It reduces the tooling preparation time for multi-variety workpiece inspection from several hours of traditional special inspection tools to less than a few minutes, greatly improving the flexibility and overall efficiency of the production line. 2. The present invention, through the locking component, can lock the positioning column of the naturally pressing positioning column with the clamping force provided by the clamping airbag without causing workpiece deformation. At the same time, the auxiliary adsorption force generated by the negative pressure hole at the top of the positioning column can provide additional overall stability force, ensuring that the workpiece does not shake at all during the scanning process. It is especially suitable for thin-walled metal parts with poor rigidity. 3. This invention combines positioning posts and micro grating rulers into a sensor array to directly acquire three-dimensional point cloud data of the bottom surface of the workpiece. This data is fused with the upper surface data collected by the laser scanning device in a unified coordinate system, which can quickly and actively acquire the contour information of the workpiece surface and obtain the three-dimensional spatial posture data of the workpiece. Compared with the laser scanning device that needs to be mechanically adjusted in three dimensions to achieve the inspection efficiency of metal workpieces, this invention is more efficient. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure in this invention; Figure 2 This is a half-sectional view of the workpiece placement base in this invention; Figure 3 In this invention Figure 2 A magnified structural diagram at point A; Figure 4 This is a schematic diagram of the structure of the reset spring in this invention; Figure 5 This is a schematic diagram of a half-section of the filter box in this invention; Figure 6 This is a schematic diagram of the clamping airbag structure in this invention; Figure 7 This is a schematic diagram of the positioning column in this invention; Figure 8 This is a schematic diagram of the laser detection component in this invention.

[0018] In the diagram: 1. Workpiece placement base; 2. Support column; 3. Workpiece positioning assembly; 301. Positioning column; 302. Positioning plate; 303. Return spring; 304. Guide sleeve; 305. Telescopic inner rod; 306. Telescopic outer rod; 307. Limiting plate; 308. Annular groove; 309. Miniature grating ruler; 310. Negative pressure hole; 4. Locking assembly; 401. Filter box; 402. Forward and reverse fan; 403. Connecting pipe; 404. 405. Solenoid valve; 406. Second solenoid valve; 407. First filter plate; 408. Second filter plate; 409. Third filter plate; 410. Clamping airbag; 411. Air inlet pipe; 5. Measuring bracket; 6. Laser detection assembly; 601. Horizontal motor; 602. Longitudinal motor; 603. Drive screw; 604. Longitudinal rod; 605. Cross rod; 606. Laser scanning equipment; 607. Guide bracket; 7. Reference ball; 8. Control assembly. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] Please see Figure 1-8 As shown, a metal-based intelligent dynamic calibration fixture based on multi-dimensional laser scanning includes a workpiece placement base 1, a workpiece positioning component 3 installed inside the workpiece placement base 1 for positioning the metal part, a laser detection component 6 installed above the workpiece placement base 1 for laser scanning, and a locking component 4 set on the side of the workpiece placement base 1 for locking the workpiece positioning component 3. The workpiece placement base 1 is made of 45# steel, forged as a whole and then heat-treated. The bottom is equipped with 4 sets of M20 leveling bolts and 5mm thick nitrile rubber shock-absorbing pads to effectively reduce the impact of external vibration on the detection accuracy. The workpiece positioning component 3 includes: multiple positioning columns 301 arranged in an array through the top of the workpiece placement base 1; an annular groove 308 is provided at the connection between the positioning column 301 and the workpiece placement base 1; and a micro grating ruler 309 is provided on the side of the annular groove 308. The micro grating ruler 309 is fixed to the side of the annular groove 308 by a special clamp to collect the lifting displacement data of the positioning column 301 in real time. A support column 2 is welded above the workpiece placement base 1, and a measuring bracket 5 is welded to the top of the support column 2. The laser detection assembly 6 includes: a laser scanning device 606 that is slidably mounted on the bottom of the measuring bracket 5; The locking assembly 4 includes: clamping airbags 409 installed around the positioning post 301, with an air inlet pipe 410 between the three clamping airbags 409. The three clamping airbags 409 are arranged in a group around the positioning post 301 at an angle of 120°. They are made of nitrile rubber with a thickness of 2mm. After inflation, the diameter can reach 25mm. The working air pressure is 0.6-0.8MPa. The clamping force of a single clamping airbag 409 is greater than 300N. The positioning post 301 is locked in a ring-like manner through elastic deformation. After locking, the radial runout of the positioning post 301 is small.

[0021] It should be noted that the workpiece positioning component 3, which is composed of multiple positioning columns 301 arranged in an array, can automatically adapt to metal workpieces of different shapes and sizes without replacing any parts. Taking a 16×16 array of positioning columns 301 as an example, it can provide 256 independent support points, realizing "one tool for multiple uses". It reduces the tooling preparation time for multi-variety workpiece inspection from several hours of traditional special inspection tools to less than a few minutes, greatly improving the flexibility and overall efficiency of the production line.

[0022] The workpiece positioning assembly 3 also includes: a positioning plate 302 fixed inside the workpiece placement base 1, a positioning post 301 passing through the inside of the positioning plate 302, and a limit plate 307 welded to the bottom of the positioning post 301.

[0023] The workpiece positioning assembly 3 also includes a return spring 303 fixed to the bottom of the limiting plate 307. A telescopic outer rod 306 is installed inside the return spring 303, and a telescopic inner rod 305 is movably inserted inside the telescopic outer rod 306. The connection between the telescopic inner rod 305 and the telescopic outer rod 306 is filled with hydraulic oil. The return spring 303 is made of spring steel to ensure that the positioning post 301 automatically returns to its initial height when there is no workpiece. The clearance between the telescopic outer rod 306 and the telescopic inner rod 305 is 0.02-0.03mm, and the interior is filled with No. 46 anti-wear hydraulic oil to provide a buffering and damping effect, preventing excessive impact when the positioning post 301 returns to its original position.

[0024] A guide sleeve 304 is fixed to the bottom of the positioning plate 302. The positioning post 301 passes through the inside of the guide sleeve 304, and the clamping airbag 409 is installed inside the guide sleeve 304. The guide sleeve 304 is interference-fitted to the bottom of the positioning plate 302 to provide guidance for the positioning post 301 and reduce the coefficient of friction during lifting.

[0025] The positioning post 301 has a hollow structure, and a negative pressure hole 310 is opened on the top of the positioning post 301. The positioning post 301 is made of 316L stainless steel. The top is chamfered at 30° to avoid scratching the workpiece. The hollow structure has an inner diameter of 8mm, and four negative pressure holes 310 with a diameter of 2mm are evenly opened on the top with a hole spacing of 90°. The workpiece fit is enhanced by negative pressure adsorption.

[0026] It should be noted that by using the workpiece positioning component 3, gravity-driven natural downward pressure and the clamping airbag 409 for lateral locking, the forced clamping force of traditional mechanical fixtures is avoided. Especially for thin-walled and easily deformable metal workpieces, this can effectively prevent additional stress deformation introduced during clamping and ensure that the measurement status truly reflects the workpiece processing status.

[0027] The locking assembly 4 also includes a filter box 401 located on the side of the workpiece placement base 1. The side of the filter box 401 is connected to a forward and reverse fan 402 via a pipe. The forward and reverse fan 402 uses a vortex air pump. When rotating forward, it inflates the clamping airbag 409. When rotating in reverse, it draws air through the negative pressure hole 310 of the positioning column 301. The wind speed is adjusted by a frequency converter.

[0028] A connecting pipe 403 is provided between the filter box 401, the positioning column 301, and the clamping airbag 409. One connecting pipe 403 is equipped with a first solenoid valve 404, which is installed on the connecting pipe 403 between the filter box 401 and the positioning column 301. The other connecting pipe 403 is equipped with a second solenoid valve 405, which is installed on the connecting pipe 403 between the filter box 401 and the clamping airbag 409. Both the air inlet pipe 410 and the connecting pipe 403 are made of PU tubing. The first solenoid valve 404 and the second solenoid valve 405 are installed on the connecting pipe 403 respectively, so as to realize independent control of negative pressure adsorption and airbag clamping.

[0029] The locking assembly 4 also includes: a first filter plate 406, a second filter plate 407, and a third filter plate 408 that are detachably installed inside the filter box 401. The first filter plate 406, the second filter plate 407, and the third filter plate 408 are distributed from left to right. A sealed door is provided at the front end of the filter box 401 to facilitate the replacement of the first filter plate 406, the second filter plate 407, and the third filter plate 408. The first filter plate 406 is a 50μm nylon mesh used for primary dust filtration, the second filter plate 407 is a 10μm polyester fiber used for intermediate impurity filtration, and the third filter plate 408 is a 0.5μm PTFE membrane used for fine oil filtration. This prevents impurities from clogging the negative pressure hole 310 or the clamping airbag 409. A transparent acrylic sealed door is provided at the front end and is fixed by four buckles to facilitate weekly filter plate replacement.

[0030] It should be noted that, through the locking component 4, the clamping force provided by the clamping airbag 409 can lock the positioning post 301 under natural downward pressure without causing workpiece deformation. At the same time, the auxiliary adsorption force generated by the negative pressure hole 310 at the top of the positioning post 301 can provide additional overall stability force, ensuring that the workpiece does not shake at all during the scanning process, which is especially suitable for thin-walled metal parts with poor rigidity.

[0031] The laser detection assembly 6 also includes: two guide brackets 607 installed on the bottom end face of the measuring bracket 5; a crossbar 605 is provided between the two guide brackets 607; a longitudinal rod 604 is slidably connected below the crossbar 605 via a threaded sleeve; both the longitudinal rod 604 and the crossbar 605 are rotatably connected to a transmission screw 603; a transverse motor 601 is fixed to the end of one transmission screw 603, and a longitudinal motor 602 is fixed to the end of the other transmission screw 603; the laser scanning device 606 is slidably connected via the threaded sleeve. Below the vertical rod 604, the guide bracket 607 is a linear slide rail; both the horizontal rod 605 and the vertical rod 604 are made of aluminum profiles. The bottom of the horizontal rod 605 is equipped with a linear slide rail that mates with the vertical rod 604. The internal transmission screw 603 of the horizontal rod 605 is a ball screw driven by the horizontal motor 601. The internal transmission screw 603 of the vertical rod 604 is a ball screw driven by the vertical motor 602. The laser scanning device 606 uses a Keyence LK-G80 laser profile sensor, which is connected to the bottom slide rail of the vertical rod 604 through a special threaded sleeve.

[0032] It should be noted that the control component 8, as the system brain, synchronously controls the horizontal motor 601, the vertical motor 602, the forward and reverse fan 402, the first solenoid valve 404, the second solenoid valve 405, and the miniature grating ruler 309, realizing full automation from positioning, locking, scanning to analysis.

[0033] The measuring bracket 5 houses a control component 8, which is electrically connected to the horizontal motor 601, the vertical motor 602, the forward and reverse fan 402, the first solenoid valve 404, the second solenoid valve 405, and the miniature grating ruler 309. Reference balls 7 are installed at the four corners of the workpiece placement base 1. The control component 8, integrated within the measuring bracket 5, is connected to the horizontal motor 601, the vertical motor 602, the forward and reverse fan 402, the first solenoid valve 404, the second solenoid valve 405, the miniature grating ruler 309, and the laser scanning device 606 via a PROFINET bus. A configurable touchscreen is available for real-time display of scanning data, positioning accuracy, and device status. The four reference balls 7 are made of 99.9% alumina ceramic, with a diameter of 25mm, a roundness ≤0.0005mm, and a surface roughness Ra≤0.02μm, used for coordinate system calibration of the laser scanning device 606.

[0034] It should be noted that by combining the positioning post 301 and the micro grating ruler 309 into a sensor array, the three-dimensional point cloud data of the bottom surface of the workpiece can be directly acquired. This data is fused with the upper surface data collected by the laser scanning device 606 in a unified coordinate system, which can quickly and actively acquire the contour information of the workpiece surface and obtain the three-dimensional spatial posture data of the workpiece. This method is more efficient than the method of mechanically adjusting the laser scanning device 606 in three dimensions to achieve the inspection of metal workpieces.

[0035] Working principle: The metal workpiece to be inspected is placed on a support plane composed of arrayed positioning columns 301. Under its own gravity, the workpiece presses down on the positioning column 301 it contacts. Each positioning column 301 is precisely guided by a guide sleeve 304 to ensure vertical movement. During the pressing process, a micro grating ruler 309 integrated in the annular groove 308 measures the downward displacement of each positioning column 301 in real time. The preset two-dimensional plane coordinates X, Y of all positioning columns 301 are combined with their corresponding downward displacement Z to generate a set of point cloud data describing the three-dimensional contour of the bottom surface of the workpiece in the control component 8. After the positioning post 301 completes its adaptive positioning, the locking assembly 4 starts working. The control assembly 8 starts the forward and reverse fan 402 and opens the second solenoid valve 405. Compressed air is purified by the filter box 401 and then injected into the clamping airbag 409 inside the guide sleeve 304 through the connecting pipe 403. After the clamping airbag 409 expands, it evenly hugs the positioning post 301 from all sides and uses friction to firmly lock it in the current position, effectively preventing displacement caused by vibration during subsequent scanning. After inflation, the second solenoid valve 405 closes and the clamping airbag 409 is in an expanded state. Subsequently, for workpieces with flat bottom surfaces, the first solenoid valve 404 can be opened to generate adsorption force through the negative pressure hole 310 at the top of the positioning post 301 to help fix the workpiece. During this process, the negative pressure adsorption operation and the expansion of the clamping airbag 409 are controlled independently. After the workpiece is stably locked, the laser detection component 6 starts to work. The control component 8 controls the horizontal motor 601 and the vertical motor 602 to drive the two sets of transmission screws 603 to rotate, thereby driving the laser scanning device 606 to perform precise two-dimensional planar motion below the measuring bracket 5. This enables multi-angle, full-coverage laser scanning of the upper surface and side features of the workpiece. Before or during scanning, the laser scanning device 606 will first scan the reference spheres 7 fixed at the four corners of the workpiece placement base 1. Through these reference spheres 7 with known absolute coordinates, the system unifies the bottom point cloud data collected by the micro grating ruler 309 with the upper surface point cloud data collected by the laser scanning device 606 into the same high-precision global coordinate system. Control component 8 compares the fused complete 3D point cloud data with the standard CAD model of the workpiece to calculate quality parameters such as dimensions and geometric tolerances. If out-of-tolerance is detected, the system can feed this deviation data back to the upstream machine tool or robot in real time through the communication interface to guide it to dynamically adjust and calibrate processing parameters such as tool compensation and stamping depth, thereby achieving closed-loop quality control of the production process.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A smart dynamic calibration fixture for metal mid-push based on multi-dimensional laser scanning, characterized in that, It includes a workpiece placement base, a workpiece positioning component installed inside the workpiece placement base for positioning metal parts, and a laser detection component installed above the workpiece placement base for laser scanning. And a locking component located on the side of the workpiece placement base for locking the workpiece positioning component; The workpiece positioning component includes: multiple positioning columns arranged in an array through the top of the workpiece placement base, an annular groove is provided at the connection between the positioning column and the workpiece placement base, and a micro grating ruler is provided on the side of the annular groove. A support column is welded above the workpiece placement base, and a measuring bracket is welded to the top of the support column. The laser detection assembly includes: a laser scanning device that is slidably mounted on the bottom of the measuring bracket; The locking assembly includes: clamping airbags installed around the positioning post, and an air inlet pipe is provided between the three clamping airbags.

2. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 1, characterized in that, The workpiece positioning assembly further includes: a positioning plate fixed inside the workpiece placement base, the positioning column passing through the interior of the positioning plate, and a limit plate welded to the bottom of the positioning column.

3. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 2, characterized in that, The workpiece positioning assembly further includes: a return spring fixed to the bottom of the limiting plate, wherein a telescopic outer rod is installed inside the return spring, and a telescopic inner rod is movably inserted inside the telescopic outer rod, and the connection between the telescopic inner rod and the telescopic outer rod is filled with hydraulic oil.

4. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 3, characterized in that, The bottom of the positioning plate is fixed with a guide sleeve, the positioning post passes through the inside of the guide sleeve, and the clamping airbag is installed inside the guide sleeve.

5. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 4, characterized in that, The positioning post has a hollow structure, and a negative pressure hole is opened at the top of the positioning post.

6. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 5, characterized in that, The locking assembly further includes a filter box disposed on the side of the workpiece placement base, wherein the side of the filter box is connected to a forward and reverse fan via a pipe.

7. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 6, characterized in that, A connecting pipe is provided between the filter box, the positioning column, and the clamping airbag. One of the connecting pipes is equipped with a first solenoid valve, which is installed on the connecting pipe between the filter box and the positioning column. The other connecting pipe is equipped with a second solenoid valve, which is installed on the connecting pipe between the filter box and the clamping airbag.

8. The intelligent dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 7, characterized in that, The locking assembly further includes: a first filter plate, a second filter plate, and a third filter plate that are detachably installed inside the filter box. The first filter plate, the second filter plate, and the third filter plate are arranged sequentially from left to right. A sealed door is provided at the front end of the filter box to facilitate the replacement of the first filter plate, the second filter plate, and the third filter plate inside.

9. A smart dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 8, characterized in that, The laser detection assembly further includes: two guide brackets installed on the bottom end face of the measuring bracket, a crossbar between the two guide brackets, a longitudinal rod slidably connected below the crossbar via a threaded sleeve, and a transmission screw rotatably connected inside both the longitudinal rod and the crossbar. A transverse motor is fixed to the end of one of the transmission screws, and a longitudinal motor is fixed to the end of the other transmission screw. The laser scanning device is slidably connected below the longitudinal rod via a threaded sleeve.

10. A smart dynamic calibration fixture for metal pushing based on multi-dimensional laser scanning according to claim 9, characterized in that, The measuring bracket is equipped with a control component, which is electrically connected to a horizontal motor, a vertical motor, a forward and reverse fan, a first solenoid valve, a second solenoid valve, and a miniature grating ruler. Reference balls are installed at the four corners of the workpiece placement base.

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