Thickness measuring device

Abstract

The utility model provides a thickness measuring device, and relates to the technical field of cell thickness measurement. The thickness measuring device comprises a thickness measuring rack, a measuring table, a fixing frame, a driving mechanism, a pressing plate, a connecting piece and a plurality of thickness measuring devices. The measuring table is arranged on the thickness measuring rack, and the measuring table is configured to place a workpiece to be measured; the fixing frame is arranged on the thickness measuring rack; the driving mechanism is arranged on the fixing frame; the pressing plate is arranged above the measuring table, and the driving mechanism drives the pressing plate to extrude or be far away from the workpiece to be measured; the connecting piece is connected with the pressing plate and the driving mechanism, and the connecting piece enables the pressing plate to incline in the vertical direction relative to the driving mechanism; the thickness measuring devices measure the thickness of the workpiece to be measured. The pressing plate can be better attached to the surface of the to-be-measured workpiece, the authenticity and accuracy of measurement of the to-be-measured workpiece are improved, and the measurement precision is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of battery cell thickness measurement technology, specifically to a thickness measurement device. Background Technology

[0002] As an important form of lithium battery, pouch cells are widely used in consumer electronics, new energy vehicles, and other fields due to their high energy density and good safety. In the production process of pouch cells, cell thickness is one of the key parameters affecting their performance and safety. Therefore, accurate thickness measurement of pouch cells is crucial.

[0003] When measuring the thickness of a pouch cell, an upper pressure block is needed to press the cell down before measuring its thickness. However, in existing thickness measuring devices, the upper pressure block cannot fit well against the cell surface, resulting in inaccurate cell measurement data. Utility Model Content

[0004] In view of the problems existing in the prior art, the present invention provides a thickness measuring device to improve the problem that the upper pressure block cannot fit the surface of the battery cell during the existing battery cell measurement, resulting in inaccurate battery cell thickness measurement.

[0005] To achieve the above and other related objectives, this utility model provides a thickness measuring device, including a thickness measuring frame, a measuring table, a fixing frame, a drive mechanism, a pressure plate, a connecting member, and multiple thickness gauges. The measuring table is disposed on the thickness measuring frame and configured to hold the workpiece to be measured; the fixing frame is disposed on the thickness measuring frame; the drive mechanism is disposed on the fixing frame; the pressure plate is disposed above the measuring table, and the drive mechanism drives the pressure plate to press against or move away from the workpiece to be measured; the connecting member connects the pressure plate and the drive mechanism, and the connecting member allows the pressure plate to tilt vertically relative to the drive mechanism; multiple thickness gauges are disposed between the pressure plate and the thickness measuring frame, or between the pressure plate and the measuring table, to measure the thickness of the workpiece to be measured.

[0006] In an exemplary embodiment of this utility model, the thickness gauge is fixed to the thickness measuring frame or the measuring platform.

[0007] In an exemplary embodiment of this utility model, the thickness measuring device includes a pressure sensor, which is disposed between the connector and the pressure plate.

[0008] In an exemplary embodiment of this utility model, the connecting member includes a fisheye bearing and a fixing block. The fisheye bearing is connected to the driving mechanism; the fixing block connects the fisheye bearing and the pressure plate.

[0009] In an exemplary embodiment of this utility model, the thickness measuring device includes an adapter plate, which is fixed to the fixed block. The projection of the adapter plate in the vertical direction exceeds the projection of the fixed block in the vertical direction. A plurality of connecting posts are provided on the side of the adapter plate away from the fixed block. The pressure plate includes a stone slab and a connecting plate. The accuracy class of the side of the stone slab near the measuring table is 0. The connecting plate is fixed to the stone slab, and the side of the connecting plate away from the stone slab is fixed to the connecting posts.

[0010] In an exemplary embodiment of this utility model, the fixing frame includes a plurality of connecting rods, which are fixed to the thickness measuring machine frame; a fixing plate is fixedly disposed on the top of the connecting rods, and the fixing plate is located above the measuring table.

[0011] In an exemplary embodiment of the present invention, the driving mechanism includes a telescopic cylinder, which is fixed to the fixed plate, and the push rod of the telescopic cylinder passes through the fixed plate to the space between the fixed plate and the measuring stage.

[0012] In an exemplary embodiment of this utility model, the thickness measuring device includes a guide shaft, one end of which is fixed to the pressure plate, and the other end of which passes through the fixed plate. The guide shaft and the fixed plate are in a clearance fit, and the minimum clearance is not equal to zero.

[0013] In an exemplary embodiment of this utility model, the thickness measuring device includes a linear bearing and a guide shaft. The linear bearing is disposed on the fixed plate and has radial clearance. One end of the guide shaft is fixed to the pressure plate, and the other end passes through the linear bearing.

[0014] In an exemplary embodiment of the present invention, the thickness measuring device includes an operating frame, which is independently disposed on the outer periphery of the thickness measuring frame.

[0015] In combination with existing technologies, the beneficial effects of this utility model are as follows:

[0016] Existing thickness measuring devices often fail to properly adhere the pressure block to the surface of the battery cell, leading to inaccurate measurement data. The thickness measuring device of this application includes a thickness measuring frame, a measuring stage, a fixing frame, a drive mechanism, a pressure plate, a connecting component, and multiple thickness gauges. The measuring stage is used to place the workpiece to be measured, such as a battery cell. The drive mechanism drives the pressure plate to move towards the measuring stage until it presses against the workpiece, applying pressure. The pressure plate is connected to the drive mechanism via the connecting component. After contact with the workpiece, the pressure plate can tilt vertically according to the varying heights of different areas on the workpiece surface, allowing for better contact and improving the accuracy and reliability of the measured values, thus effectively enhancing measurement precision. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other embodiments can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of an exemplary thickness measuring device of the present invention;

[0019] Figure 2 This is a schematic diagram of the thickness measuring frame and measuring table of an exemplary thickness measuring device of this utility model;

[0020] Figure 3 This is a partial structural schematic diagram of an exemplary thickness measuring device of this utility model.

[0021] Component designation explanation:

[0022] 100. Thickness measuring frame; 110. Measuring table; 200. Fixing frame; 210. Connecting rod; 220. Fixing plate; 230. Guide shaft; 240. Linear bearing; 300. Drive mechanism; 400. Pressure plate; 410. Slab; 420. Connecting plate; 500. Connecting piece; 510. Fisheye bearing; 520. Fixing block; 600. Thickness gauge; 700. Pressure sensor; 800. Adapter plate; 810. Connecting column; 900. Operating frame. Detailed Implementation

[0023] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0024] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0025] It should be noted that the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

[0026] Thickness measurement of pouch cells is one of the final inspection processes for pouch cells. Existing thickness measurement devices have complex structures, large fluctuations in thickness measurement results, and the pressure block cannot fit well against the cell surface, resulting in large measurement errors.

[0027] Please see Figures 1 to 3 In view of this, the present invention provides a thickness measuring device, including a thickness measuring frame 100, a measuring table 110, a fixing frame 200, a driving mechanism 300, a pressure plate 400, a connecting piece 500, and a plurality of thickness gauges 600. A measuring stage 110 is mounted on the thickness measuring frame 100 and configured to hold the workpiece to be measured. A fixing frame 200 is mounted on the thickness measuring frame 100. A driving mechanism 300 is mounted on the fixing frame 200. A pressure plate 400 is mounted above the measuring stage 110, and the driving mechanism 300 drives the pressure plate 400 to press against or move away from the workpiece to be measured. A connecting member 500 connects the pressure plate 400 and the driving mechanism 300, and the connecting member 500 allows the pressure plate 400 to tilt vertically relative to the driving mechanism 300. A plurality of thickness gauges 600 are mounted between the pressure plate 400 and the thickness measuring frame 100, or between the pressure plate 400 and the measuring stage 110, to measure the thickness of the workpiece to be measured.

[0028] The pressure plate 400 is connected to the drive mechanism 300 via the connector 500. When the pressure plate 400 presses against the workpiece to be measured, such as the surface of a battery cell, the pressure plate 400 can tilt according to the actual thickness of the battery cell surface due to slight errors in thickness at different locations. This allows the battery cell to better fit against the surface, improving the accuracy of the battery cell thickness measurement. When the thickness gauge 600 is positioned between the pressure plate 400 and the measuring stage 110, the thickness measurement value of the thickness gauge 600 is the thickness of the workpiece to be measured. When the thickness gauge 600 is positioned between the pressure plate 400 and the thickness measuring frame 100, the direct thickness measurement value of the thickness gauge 600 is the sum of the thickness of the workpiece to be measured and the thickness of the measuring stage 110. By adjusting the reference of the thickness gauge 600, the reading of the thickness gauge 600 can be made to represent the thickness of the workpiece to be measured. Multiple thickness gauges 600 can measure the thickness of the battery cell at different locations. By averaging the measurement data from multiple thickness gauges 600, the accuracy of the thickness measurement can be improved, thus increasing the thickness measurement precision.

[0029] The thickness measuring frame 100 provides support and installation space for some components of the thickness measuring device. The thickness measuring frame 100 includes support legs and support plates. The support legs are in direct contact with the ground or the placement surface. On the one hand, this can increase the height of the measurement work area, making it easier for operators to operate. On the other hand, it can improve the height difference between different areas of the ground or the placement surface, making the support plate more level overall.

[0030] In one embodiment, given that the stability and surface flatness of the thickness measuring frame 100 have a certain impact on the measurement, an adjustment device is provided at the bottom of each support leg. The adjustment device adjusts the height of the support leg, thereby adjusting the stability of the thickness measuring frame 100, adjusting the level of the support plate, reducing the measurement error caused by the thickness measuring frame 100, and improving the measurement accuracy.

[0031] The adjustment device can be an adjustment shim with a screw. The screw engages with a threaded hole at the bottom of the support leg. The height of the support leg can be adjusted by adjusting the depth to which the screw is screwed into the threaded hole. The operation is convenient and simple.

[0032] Of course, as some alternatives, the adjustment device can also be used for other structures that adjust the height of the support legs, allowing the height of each support leg to be adjusted individually to adjust the level of the support plate.

[0033] Please see Figure 2 In one embodiment, the measuring stage 110 is fixedly mounted on the thickness measuring frame 100 to improve its stability and ensure stability during measurement. In other embodiments, the measuring stage 110 may simply be placed on the thickness measuring frame 100. The measuring stage 110 has a significant weight, making it less prone to shifting or tilting during measurement. Placing the measuring stage 110 on the thickness measuring frame 100 facilitates its installation and adjustment.

[0034] The upper surface of the measuring stage 110 is used to place the workpiece to be measured, and the surface of the measuring stage 110 needs to have good flatness.

[0035] In one embodiment, the measuring table 110 is a marble slab with a surface accuracy grade of 0. Grade 0 is the current national standard for the accuracy grade of rock slabs. This improves the situation where the measurement accuracy error is large due to insufficient surface accuracy of the measuring table 110, and effectively improves the measurement accuracy.

[0036] The mounting bracket 200 is set on the thickness measuring machine frame 100 and is used to install the drive mechanism 300, pressure plate 400 and other structures.

[0037] In one embodiment, the fixing bracket 200 is fixedly mounted on the support plate, and the fixing method can be bolt connection, adhesive bonding, welding, etc.

[0038] Please see Figure 1 In one embodiment, the fixing frame 200 includes a plurality of connecting rods 210 and a fixing plate 220 disposed above the connecting rods 210. The plurality of connecting rods 210 are fixed to the thickness measuring frame 100, and the connecting rods 210 provide fixed support for the fixing plate 220. The number of connecting rods 210 can be 2, 3, 4 or more. Preferably, there are 4 connecting rods 210, which are respectively disposed at the four corners of the fixing plate 220 and are all located on the outside of the measuring table 110. The workpiece to be measured can be placed on the measuring table 110 from various directions of the fixing plate 220 to facilitate thickness measurement of the workpiece.

[0039] The fixing plate 220 is fixedly disposed on the top of the connecting rod 210. The fixing methods of the fixing plate 220 and the connecting rod 210 include, but are not limited to, bolt connection, adhesive bonding, and welding. The fixing plate 220 is located above the measuring table 110, thereby facilitating the drive mechanism 300 to drive the pressure plate 400 to move toward the measuring table 110 and press against the workpiece to be measured.

[0040] The drive mechanism 300 is used to drive the pressure plate 400 to reciprocate in the direction of approaching and moving away from the measuring stage 110, so as to press against the workpiece to be measured for thickness measurement, and to reset after the thickness measurement is completed.

[0041] Please see Figure 3 In one embodiment, the drive mechanism 300 includes a telescopic cylinder, which is fixed to the fixing plate 220. The fixing method between the telescopic cylinder and the fixing plate 220 includes, but is not limited to, bolt fixing. Preferably, the telescopic cylinder is fixed above the fixing plate 220 by bolts.

[0042] The push rod of the telescopic cylinder passes through the fixed plate 220 to the space between the fixed plate 220 and the measuring platform 110. The fixed plate 220 has a through hole through which the push rod of the telescopic cylinder passes and can move up and down, thereby extending the push rod of the telescopic cylinder between the fixed plate 220 and the measuring platform 110. The push rod of the telescopic cylinder is directly or indirectly connected to the pressure plate 400, which is located between the measuring platform 110 and the fixed plate 220. The telescopic cylinder drives the pressure plate 400 to perform reciprocating linear motion, thereby measuring the workpiece to be measured and resetting it.

[0043] The telescopic cylinder can be a pneumatic telescopic cylinder, a hydraulic telescopic cylinder, an electric telescopic cylinder, etc., to achieve the reciprocating linear motion of the driving pressure plate at 400 degrees.

[0044] Of course, as some alternatives, the drive mechanism 300 can be other structures, such as a mechanism that combines a motor and a ball screw to drive the pressure plate 400 to reciprocate.

[0045] Please see Figure 3 In one embodiment, the pressure plate 400 includes a stone slab 410 and a connecting plate 420. The stone slab 410 is relatively hard and has a good surface flatness. Using the stone slab 410 can improve the measurement error caused by the deformation of the pressure plate 400 under stress. Preferably, the stone slab 410 is made of marble, and the accuracy class of the side of the stone slab 410 closest to the measuring table 110 is 0, so that the stone slab 410 can better fit the workpiece to be measured, such as a soft-pack battery cell, and improve the measurement accuracy.

[0046] Since it is inconvenient to directly connect and fix the stone slab 410 to other structures, the stone slab 410 can be easily connected and fixed to structures such as the drive mechanism 300 by fixing it relative to the connecting plate 420. The fixing methods between the connecting plate 420 and the stone slab 410 include, but are not limited to, adhesive fixing and inlay fixing, so that the connecting plate 420 and the stone slab 410 are relatively fixed.

[0047] In one embodiment, the thickness measuring device includes a guide shaft 230. One end of the guide shaft 230 is fixed to the pressure plate 400, and the other end passes through the fixing plate 220. The guide shaft 230 and the fixing plate 220 are in a clearance fit, and the minimum clearance is not zero. The guide shaft 230 guides and limits the pressure plate 400, restricting its rotation in the horizontal direction. At the same time, the guide shaft 230 and the fixing plate 220 are in an interference fit with a minimum clearance that is not zero. The guide shaft 230 and the fixing plate 220 can deflect slightly at the fit to ensure that the pressure plate 400 can rotate in the vertical direction, so that the pressure plate 400 can fit against the surface of the battery cell.

[0048] Please see Figure 3In another embodiment, the thickness measuring device includes a linear bearing 240 and a guide shaft 230. The linear bearing 240 is disposed on the fixed plate 220 and has radial clearance. One end of the guide shaft 230 is fixed to the pressure plate 400, and the other end passes through the linear bearing 240. The cooperation between the guide shaft 230 and the linear bearing 240 reduces the vertical movement resistance of the guide shaft 230, facilitating the drive mechanism 300 to drive the pressure plate 400. The radial clearance of the linear bearing 240 allows the guide shaft 230 to deflect at a certain angle, thereby limiting the horizontal deflection of the pressure plate 400 while ensuring that the pressure plate 400 can rotate to a certain extent in the vertical direction, resulting in a closer fit with the workpiece to be measured.

[0049] Please see Figure 3 In one embodiment, the guide shaft 230 is fixed to the connecting plate 420. Compared with the guide shaft 230 being directly fixed to the stone slab 410, the fixation of the guide shaft 230 to the connecting plate 420 is simpler and more reliable. The fixing methods include, but are not limited to, adhesive bonding and welding.

[0050] Please see Figure 3 In one embodiment, the connector 500 includes a fisheye bearing 510 and a fixing block 520. The fisheye bearing 510 is connected to the drive mechanism 300. The fisheye bearing 510 has self-aligning capability and advantages such as low friction, high load capacity, high durability, and maintenance-free operation. The fisheye bearing 510 enables relative rotational connection between the pressure plate 400 and the drive mechanism 300, facilitating the pressure plate 400 to adhere tightly to the workpiece to be tested. Simultaneously, the fisheye bearing 510 can reduce the eccentric force on the drive mechanism 300, thereby increasing its service life.

[0051] The fixing block 520 is used to install the fisheye bearing 510 and connect the pressure plate 400. The fixing block 520 and the pressure plate 400 can be directly connected or indirectly connected to achieve relative fixation of the fixing plate 220 and the pressure plate 400.

[0052] Please see Figure 1 and Figure 3 In one embodiment, the thickness measuring device includes an adapter plate 800, which is fixed to the fixing block 520. The fixing method between the adapter plate 800 and the fixing block 520 can be direct or indirect. The vertical projection of the adapter plate 800 exceeds the vertical projection of the fixing block 520. Multiple connecting posts 810 are provided on the side of the adapter plate 800 away from the fixing block 520. The connecting posts 810 are fixed to the pressure plate 400. Preferably, the connecting posts 810 are fixed relative to the connecting plate 420. By adding the adapter plate 800, the thrust of the driving mechanism 300 can be diffused to the connecting posts 810, thereby increasing the area of ​​action of the thrust and facilitating the pressure plate 400 to press against the workpiece to be measured.

[0053] Please see Figure 3 In one embodiment, the thickness measuring device further includes a pressure sensor 700, which is disposed between the connector 500 and the pressure plate 400. The pressure sensor 700 can provide feedback on the pressure value, thereby accurately controlling the pressure value and improving the stability and accuracy of the measurement data.

[0054] If the drive mechanism 300 is a pneumatic telescopic cylinder, it has a precision pressure regulating valve and air pressure feedback to more accurately control the pressure value and improve the stability and accuracy of the measurement. If the drive mechanism 300 is an electric telescopic cylinder, it operates based on the feedback value from the pressure sensor 700.

[0055] In one embodiment, the thickness gauge 600 is fixed on the measuring platform 110. The measuring platform 110 is a non-moving module. Installing the thickness gauge 600 on the non-moving module can avoid the influence of the movement of the moving module and improve the stability of the measurement data.

[0056] Please see Figure 2 In another embodiment, the thickness gauge 600 is fixed to the thickness gauge frame 100. Specifically, the thickness gauge 600 is located on the support plate of the thickness gauge frame 100. Mounting the thickness gauge 600 on a non-moving module avoids the influence of the moving module's movement and improves the stability of the measurement data. The distance between the measuring stage 110 and the pressure plate 400 represents the thickness of the workpiece to be measured. Since the workpiece thickness is relatively small, the installation requirements for the thickness gauge 600 are relatively high. By fixing the thickness gauge 600 to the thickness gauge frame 100, installation of the thickness gauge 600 is more convenient, and a larger thickness gauge 600 can be used, reducing the cost of the thickness gauge 600.

[0057] The thickness gauge 600 is a displacement sensor. After adjusting the reference of the thickness gauge 600, the displacement of the pressure plate 400 can be measured to obtain the thickness of the workpiece to be measured.

[0058] The thickness gauge 600 can be a contact sensor, such as a GT (Gross Tolerance) measurement sensor; or a non-contact sensor, such as an infrared sensor. Preferably, the thickness gauge 600 is a GT measurement sensor to improve measurement accuracy.

[0059] Please see Figure 1 In one embodiment, the thickness measuring device includes an operating frame 900, which is independently disposed on the outer periphery of the thickness measuring frame 100. The independent arrangement of the operating frame 900 and the thickness measuring frame 100 facilitates operation and placement of items, avoids affecting the thickness measuring frame 100, and improves the thickness measuring accuracy.

[0060] In some embodiments, the operating frame 900 can also be fixed with other devices for cell testing, enabling multi-parameter testing of the cell to be performed at a single station, thus improving the convenience of cell testing. The thickness measuring frame 100 is independent of the operating frame 900, preventing vibrations from other devices on the operating frame 900 from affecting the thickness measuring frame 100, effectively ensuring the stability and accuracy of the thickness measurement.

[0061] When the thickness measuring device of this utility model is used for thickness measurement, the workpiece to be measured is transported to the surface of the measuring table 110 by a robot or other means. After the operator performs routine positioning of the workpiece to be measured, the measurement is started. The drive mechanism 300 drives the pressure plate 400 to press down through the fisheye bearing 510, the fixing block 520, the pressure sensor 700, the adapter plate 800 and other structures. The pressure plate 400 is attached to the surface of the workpiece to be measured. The average thickness of the workpiece to be measured is finally obtained by the measuring instrument. The drive mechanism 300 drives the pressure plate 400 to reset, and the thickness measurement is completed.

[0062] The thickness measuring device of this invention has a simple structure, is easy to debug and maintain. The connecting piece 500 allows the pressure plate 400 to fit more closely to the surface of the workpiece being measured, improving measurement accuracy and reducing the radial force on the drive mechanism 300, thus increasing its service life. The adapter plate 800 increases the pressure application area, making it easier for the pressure plate 400 to fit the surface of the workpiece being measured. The measuring device is mounted on a non-motion module, reducing the influence of motion and improving the stability of the measurement data. Therefore, this invention effectively overcomes some practical problems in the prior art, thus having high utilization value and practical significance.

[0063] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A thickness measuring device, characterized in that, include: Thickness measuring machine frame; A measuring table is mounted on the thickness measuring frame, and the measuring table is configured to place the workpiece to be measured. A fixing frame is installed on the thickness measuring machine frame; The drive mechanism is mounted on the fixed frame; A pressure plate is positioned above the measuring table, and the driving mechanism drives the pressure plate to press against or move away from the workpiece to be measured. A connector connects the pressure plate to the drive mechanism, the connector enabling the pressure plate to tilt relative to the drive mechanism in the vertical direction; Multiple thickness gauges are disposed between the pressure plate and the thickness measuring frame, or between the pressure plate and the measuring table, to measure the thickness of the workpiece to be measured.

2. The thickness measuring device according to claim 1, characterized in that, The thickness gauge is fixed to the thickness measuring frame or the measuring platform.

3. The thickness measuring device according to claim 1, characterized in that, include: A pressure sensor is disposed between the connector and the pressure plate.

4. The thickness measuring device according to claim 1, characterized in that, The connector includes: A fisheye bearing is connected to the drive mechanism; A fixing block connects the fisheye bearing to the pressure plate.

5. The thickness measuring device according to claim 4, characterized in that, include: An adapter plate is fixed to the fixing block. The projection of the adapter plate in the vertical direction exceeds the projection of the fixing block in the vertical direction. Multiple connecting posts are provided on the side of the adapter plate away from the fixing block. The pressure plate includes: The stone slab, the side of the stone slab closest to the measuring platform, has an accuracy class of 0; A connecting plate is fixed to the stone slab, and the side of the connecting plate opposite to the stone slab is fixed to the connecting column.

6. The thickness measuring device according to claim 1, characterized in that, The fixing frame includes: Multiple connecting rods, wherein the multiple connecting rods are fixed on the thickness measuring frame; A fixing plate is fixedly installed on the top of the connecting rod, and the fixing plate is located above the measuring platform.

7. The thickness measuring device according to claim 6, characterized in that, The drive mechanism includes: A telescopic cylinder is fixed to the fixed plate, and the push rod of the telescopic cylinder passes through the fixed plate to the space between the fixed plate and the measuring platform.

8. The thickness measuring device according to claim 6, characterized in that, include: A guide shaft, one end of which is fixed to the pressure plate, and the other end of which passes through the fixed plate. The guide shaft and the fixed plate are in a clearance fit, and the minimum clearance is not equal to zero.

9. The thickness measuring device according to claim 6, characterized in that, include: A linear bearing, wherein the linear bearing is disposed on the fixed plate, and the linear bearing has radial clearance; The guide shaft is fixed at one end to the pressure plate and passes through the linear bearing at the other end.

10. The thickness measuring device according to claim 6, characterized in that, include: An operating frame is independently disposed on the outer periphery of the thickness measuring frame.

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