A kind of photovoltaic support processing is with free stop cutting device

Abstract

The application relates to the technical field of photovoltaic support processing, and discloses a photovoltaic support processing non-stop cutting device, which comprises a guide block and an alarm, a limiting groove is formed in the upper surface of the guide block, and a limiting rod is slidably connected to the inner wall of the limiting groove. The photovoltaic support processing non-stop cutting device is provided with mounting blocks, strain gauges, bolts, springs and other components, the strain gauges are pasted on the upper surface of the cutting knife, the state of the cutting tool can be detected in real time, the cutting force increases when the abrasion is severe, the state of the cutting tool is identified through force signal mutation, the alarm is started at the same time to warn the operator to replace the cutting tool, the severe abrasion of the cutting edge does not cause uneven cross sections when the photovoltaic support is cut off, when the cutting tool is replaced, the bolt is pulled to compress the second spring, the bolt releases the limiting of the mounting block at this time, the operator pulls the mounting block to take out the cutting knife, the effect of quickly replacing the cutting tool is achieved, and the downtime during maintenance is reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic bracket processing technology, specifically a non-stop cutting device for photovoltaic bracket processing. Background Technology

[0002] Photovoltaic brackets are structural devices used to support and fix solar panels in a solar photovoltaic power generation system. They are mainly made of materials such as steel and aluminum alloys and have the characteristics of stable support, wind and earthquake resistance, and corrosion resistance. Their core function is to fix the solar panels at the optimal angle and orientation to maximize the reception of solar radiation, while protecting the solar panels from the influence of the external environment. The photovoltaic bracket production line mainly covers machining, heat treatment, assembly and other parts. It is usually composed of uncoilers, punching devices, forming machines, cutting devices, unloading devices and other components to produce photovoltaic brackets of the required size for solar photovoltaic power generation systems.

[0003] However, in existing photovoltaic bracket processing cutting devices, it has been found that the cutting edge of the cutting blade will wear down due to continuous cutting. When the wear is severe, it is difficult to keep the cut surface of the photovoltaic bracket flat. The existing technology lacks a mechanism to detect the wear condition of the cutting blade. The wear condition of the cutting blade is judged by the operator's naked eye, which affects the production quality. In addition, the cutting blades of the existing technology are not easy to replace, resulting in long downtime during maintenance and affecting production. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this application provides a non-stop cutting device for photovoltaic bracket processing. It has the advantages of being able to detect the status of the cutting tool in real time, activating an alarm to alert the operator to replace the tool when the tool wear is severe, and being able to quickly replace the cutting tool, thus reducing downtime during maintenance. This solves the problems of existing technologies that cannot detect the wear status of the cutting tool and rely solely on visual observation by the operator, which affects the quality of product production, and that the cutting tool is not easy to replace quickly, resulting in long downtime during maintenance and affecting production.

[0006] To achieve the above objectives, this application provides the following technical solution: a non-stop cutting device for photovoltaic bracket processing, comprising a guide block and an alarm. A limit groove is formed on the upper surface of the guide block, and a limit rod is slidably connected to the inner wall of the limit groove. A spring and a damping rod are fixedly connected to the bottom surface of the limit rod, and the bottom ends of both the spring and the damping rod are fixedly connected to the inner bottom wall of the limit groove. An installation block is slidably connected to the inner wall of the limit rod, and a cutting blade is fixedly connected to the right side of the installation block. A strain gauge is provided on the upper surface of the cutting blade. A sliding groove is formed inside the limit rod, and a pin is slidably connected to the inner wall of the sliding groove. Two springs are fixedly connected to the left side of the pin, and the left end of each spring is fixedly connected to the inner side wall of the sliding groove.

[0007] The above solution enables real-time detection of the cutting blade wear, preventing uneven cut surfaces caused by severe blade wear during photovoltaic bracket cutting, and facilitates quick blade replacement. Strain gauges are attached to the upper surface of the cutting blade. These gauges monitor the blade's condition in real time. When wear is severe, the cutting force increases, and the sudden change in force signal identifies the blade's condition. Simultaneously, an alarm is activated to alert the operator to replace the blade. A sliding groove is created inside the limit rod, and a pin is positioned on the inner wall of this groove. The two prongs of the pin slide against both the limit rod and the mounting block. A spring is used to hold the pin in place, limiting the longitudinal movement of the mounting block. When disassembly is needed, pulling the pin compresses the spring, releasing the pin's restraint on the mounting block. The operator can then pull the mounting block to remove the cutting blade and strain gauges, achieving rapid blade replacement, reducing downtime, and preventing disruption to production efficiency.

[0008] Furthermore, a fixing block is fixedly connected to the bottom surface of the guide block, a fixing seat is slidably connected to the outer surface of the fixing block, an adjusting bolt is threadedly connected to the inner wall of the fixing seat, and the left end of the adjusting bolt is rotatably connected to the right side of the guide block.

[0009] The above scheme involves installing a fixing block on the bottom surface of a guide block and fixing them together to achieve the installation of the fixing block. A fixing seat is placed on the surface of the fixing block, and the fixing block and the fixing seat are set to slide. The fixing seat limits the movement of the fixing block and the guide block. The inner wall of the guide block guides the photovoltaic bracket through the photovoltaic bracket. The adjusting bolt is threaded to the fixing seat and rotatably connected to the guide block. Rotating the adjusting bolt allows the fixing block and the guide block to be adjusted, which facilitates the adjustment of the guiding position of the photovoltaic bracket and prevents the photovoltaic bracket from bending and transmitting.

[0010] Furthermore, a base plate is fixedly installed on the bottom surface of the fixed base, and a mounting bracket is fixedly connected to the upper surface of the base plate. The upper surface of the mounting bracket is fixedly installed with the bottom surface of the alarm.

[0011] The above method involves installing the base plate on the bottom surface of the mounting base and fixing it with bolts. The four support columns on the bottom surface of the mounting frame are then fixed to the base plate to install the mounting frame. Finally, the alarm is connected to the upper surface of the mounting frame to install the alarm.

[0012] Furthermore, a telescopic rod is fixedly connected to the upper surface of the mounting bracket, and a pressure block is fixedly connected to the output end of the telescopic rod.

[0013] The above scheme involves installing a telescopic rod on the upper surface of the mounting frame and installing a pressure block at the output end of the telescopic rod. The telescopic rod allows the pressure block to descend, which in turn presses down on the limit rod. This causes the limit rod to drive the cutting blade to cut the photovoltaic bracket. At this time, the first spring and the damping rod are compressed. When the pressure block returns to its original position, the cutting blade can automatically return to its original position under the action of the first spring and the damping rod.

[0014] Furthermore, a mounting plate is provided below the guide block, and a motor and two guide rails are fixedly connected to the upper surface of the mounting plate.

[0015] The above method involves placing the mounting plate below the guide block and mounting the motor and guide rail on the upper surface of the mounting plate to fix the motor and guide rail.

[0016] Furthermore, the output shaft of the motor is fixedly connected to a threaded rod, and a connecting block is threadedly connected to the outer surface of the threaded rod. The upper surface of the connecting block is fixedly connected to the bottom surface of the base plate.

[0017] The above scheme involves installing the threaded rod on the output shaft of the motor as a fixed connection. The motor enables the threaded rod to rotate, connecting the connecting block to the threaded rod. The upper surface of the connecting block is fixed to the base plate, and the rotation of the threaded rod causes the connecting block to move the base plate.

[0018] Furthermore, the outer surface of the threaded rod is rotatably connected to two limiting members, the bottom surface of each limiting member is fixedly connected to the upper surface of the mounting plate, and the outer surface of each guide rail is slidably connected to a slider, the upper surface of each slider is fixedly connected to the bottom surface of the base plate.

[0019] The above scheme involves installing a limiting component on the surface of the threaded rod, setting it as a rotatable connection, and connecting the bottom surface of the limiting component to the upper surface of the mounting plate to limit the threaded rod and ensure its stable rotation. A slider is installed on the surface of the guide rail, setting it as a sliding connection, and the slider is fixed to the base plate. The movement of the base plate causes the slider to slide on the surface of the guide rail, thus limiting the movement of the base plate and ensuring its stable movement.

[0020] Furthermore, a laser Doppler velocimeter is mounted on the upper surface of the mounting plate, and a fixing rod is fixedly mounted on the upper surface of the mounting plate. A laser displacement sensor is fixedly mounted on the right end of the fixing rod.

[0021] The above scheme involves placing a laser Doppler velocimeter on the upper surface of the mounting plate and at its rear end. The bottom surface of the base plate has a square block corresponding to the laser Doppler velocimeter, allowing the laser Doppler velocimeter to calculate the velocity by irradiating the square block on the bottom surface of the base plate with a laser and calculating the velocity through the Doppler frequency shift of the reflected light. A fixing rod is then installed on the upper surface of the mounting plate, and a laser displacement sensor is installed on the right end of the fixing rod. The laser displacement sensor can detect the movement distance of the photovoltaic bracket.

[0022] Beneficial effects

[0023] This photovoltaic bracket processing non-stop cutting device, through the installation of components such as mounting blocks, strain gauges, pins, and springs, uses strain gauges attached to the upper surface of the cutting blade to monitor the blade's condition in real time. When wear is severe, the cutting force increases, and the blade condition is identified by the sudden change in force signal. At the same time, an alarm is activated to alert the operator to replace the blade, preventing uneven cuts caused by severe blade wear. During replacement, pulling the pin compresses the spring, releasing the pin from its limit on the mounting block. The operator can then pull the mounting block to remove the cutting blade, achieving rapid blade replacement and reducing downtime during maintenance. A laser displacement sensor detects the movement distance of the photovoltaic bracket. When a set distance is reached, a motor is activated, causing the threaded rod to move the connecting block and the base plate. A laser Doppler velocimeter, in conjunction with a square block on the bottom of the base plate, detects the movement speed of the base plate. When the speed matches the movement speed of the photovoltaic bracket, a telescopic rod is activated, causing the pressure block to press down the limit rod, thereby cutting the photovoltaic bracket with the cutting blade. This achieves non-stop cutting, improving production efficiency. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the entire application;

[0025] Figure 2 This is the overall main view structure diagram of this application;

[0026] Figure 3 This is a structural diagram showing the connection relationship between the threaded rod and the connecting block in this application;

[0027] Figure 4 This is a structural diagram showing the connection relationship between the fixing block and the fixing seat in this application;

[0028] Figure 5 This is a structural diagram showing the connection relationship between the limiting groove and the limiting rod in this application;

[0029] Figure 6 This is a structural diagram showing the connection relationship between the pin and the second spring in this application.

[0030] In the picture:

[0031] 1. Guide block; 2. Limiting groove; 3. Limiting rod; 4. Spring 1; 5. Damping rod; 6. Mounting block; 7. Cutting knife; 8. Strain gauge; 9. Sliding groove; 10. Pin; 11. Spring 2; 12. Fixing block; 13. Fixing seat; 14. Adjusting bolt; 15. Base plate; 16. Mounting bracket; 17. Alarm; 18. Telescopic rod; 19. Pressure block; 20. Mounting plate; 21. Motor; 22. Threaded rod; 23. Connecting block; 24. Limiting component; 25. Guide rail; 26. Slider; 27. Laser Doppler velocimeter; 28. Fixing rod; 29. ​​Laser displacement sensor. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 4 , Figure 5 and Figure 6 This embodiment of a photovoltaic bracket processing non-stop cutting device includes a guide block 1 and an alarm 17. The upper surface of the guide block 1 is provided with a limit groove 2. The inner wall of the limit groove 2 is slidably connected to a limit rod 3. The bottom surface of the limit rod 3 is fixedly connected to a spring 4 and a damping rod 5. The bottom ends of the spring 4 and the damping rod 5 are both fixedly connected to the inner bottom wall of the limit groove 2. The inner wall of the limit rod 3 is slidably connected to an installation block 6. The right side of the installation block 6 is fixedly connected to a cutting blade 7. The upper surface of the cutting blade 7 is provided with a strain gauge 8. The inside of the limit rod 3 is provided with a sliding groove 9. The inner wall of the sliding groove 9 is slidably connected to a pin 10. The left side of the pin 10 is fixedly connected to two springs 11. The left end of each spring 11 is fixedly connected to the inner side wall of the sliding groove 9.

[0034] Please see Figure 1 , Figure 2 and Figure 4A fixed block 12 is fixedly connected to the bottom surface of the guide block 1. A fixed seat 13 is slidably connected to the outer surface of the fixed block 12. An adjusting bolt 14 is threadedly connected to the inner wall of the fixed seat 13. The left end of the adjusting bolt 14 is rotatably connected to the right side of the guide block 1. The fixed block 12 is installed on the bottom surface of the guide block 1 and fixed between them to achieve the installation of the fixed block 12. The fixed seat 13 is set on the surface of the fixed block 12, and the fixed block 12 and the fixed seat 13 are set to slide. The fixed seat 13 is used to limit the position of the fixed block 12 and the guide block 1. The inner wall of the guide block 1 guides the photovoltaic bracket through the photovoltaic bracket. The adjusting bolt 14 is threadedly connected to the fixed seat 13 and rotatably connected to the guide block 1. By rotating the adjusting bolt 14, the fixed block 12 and the guide block 1 can be adjusted, which facilitates the adjustment of the guiding position of the photovoltaic bracket and prevents the photovoltaic bracket from bending and transmitting.

[0035] Please see Figure 1 , Figure 2 and Figure 4 A base plate 15 is fixedly installed on the bottom surface of the mounting base 13. A mounting bracket 16 is fixedly connected to the upper surface of the base plate 15. The upper surface of the mounting bracket 16 is fixedly installed to the bottom surface of the alarm 17. The base plate 15 is installed on the bottom surface of the mounting base 13 and fixed with bolts. The mounting bracket 16 is fixed to the base plate 15 through four support columns on the bottom surface, thereby realizing the installation of the mounting bracket 16. The alarm 17 is connected to the upper surface of the mounting bracket 16, thereby realizing the installation of the alarm 17.

[0036] Please see Figure 1 , Figure 2 and Figure 5 A telescopic rod 18 is fixedly connected to the upper surface of the mounting frame 16. A pressure block 19 is fixedly connected to the output end of the telescopic rod 18. The telescopic rod 18 is installed on the upper surface of the mounting frame 16, and the pressure block 19 is installed at the output end of the telescopic rod 18. The pressure block 19 can be lowered by the telescopic rod 18, which in turn can press down the limit rod 3, causing the limit rod 3 to drive the cutting blade 7 to cut the photovoltaic bracket. At this time, the spring 4 and the damping rod 5 are compressed. When the pressure block 19 is reset, the cutting blade 7 can automatically reset under the action of the spring 4 and the damping rod 5.

[0037] Please see Figure 1 , Figure 2 and Figure 3 A mounting plate 20 is provided below the guide block 1. A motor 21 and two guide rails 25 are fixedly connected to the upper surface of the mounting plate 20. The mounting plate 20 is set below the guide block 1, and the motor 21 and guide rails 25 are installed on the upper surface of the mounting plate 20 to fix the motor 21 and guide rails 25.

[0038] Please see Figure 1 and Figure 3The output shaft of the motor 21 is fixedly connected to a threaded rod 22. A connecting block 23 is threadedly connected to the outer surface of the threaded rod 22. The upper surface of the connecting block 23 is fixedly connected to the bottom surface of the base plate 15. The threaded rod 22 is installed on the output shaft of the motor 21 and is set as a fixed connection. The motor 21 enables the threaded rod 22 to rotate, connecting the connecting block 23 to the threaded rod 22. The upper surface of the connecting block 23 is fixed to the base plate 15. The rotation of the threaded rod 22 enables the connecting block 23 to drive the base plate 15 to move.

[0039] Please see Figure 1 and Figure 3 Two limiting members 24 are rotatably connected to the outer surface of the threaded rod 22. The bottom surface of each limiting member 24 is fixedly connected to the upper surface of the mounting plate 20. A slider 26 is slidably connected to the outer surface of each guide rail 25. The upper surface of each slider 26 is fixedly connected to the bottom surface of the base plate 15. The limiting members 24 are installed on the surface of the threaded rod 22, which is set as a rotatable connection. The bottom surface of the limiting members 24 is connected to the upper surface of the mounting plate 20 to limit the threaded rod 22 and ensure that the threaded rod 22 rotates stably. The slider 26 is installed on the surface of the guide rail 25, which is set as a slidable connection. The slider 26 is fixed to the base plate 15. The slider 26 slides on the surface of the guide rail 25 by the movement of the base plate 15, which limits the movement of the base plate 15 and ensures that the movement of the base plate 15 is stable.

[0040] Please see Figure 1 , Figure 2 and Figure 3 A laser Doppler velocimeter 27 is mounted on the upper surface of the mounting plate 20. A fixing rod 28 is fixedly mounted on the upper surface of the mounting plate 20. A laser displacement sensor 29 is fixedly mounted on the right end of the fixing rod 28. The laser Doppler velocimeter 27 is set on the upper surface of the mounting plate 20 and is located at the rear end of the mounting plate 20. The bottom surface of the base plate 15 has a square block, which corresponds to the laser Doppler velocimeter 27. This allows the laser Doppler velocimeter 27 to use laser to irradiate the square block on the bottom surface of the base plate 15 and calculate the velocity through the Doppler frequency shift of the reflected light. The fixing rod 28 is mounted on the upper surface of the mounting plate 20, and the laser displacement sensor 29 is mounted on the right end of the fixing rod 28. The laser displacement sensor 29 can detect the movement distance of the photovoltaic bracket.

[0041] This embodiment describes a non-stop cutting device for photovoltaic bracket processing. By incorporating components such as a mounting block 6, strain gauge 8, pin 10, and spring 11, and attaching strain gauge 8 to the upper surface of the cutting blade 7, the device can monitor the blade's condition in real time. When wear becomes severe, the cutting force increases. The device identifies the blade's condition through sudden changes in force signals and simultaneously activates an alarm 17 to alert the operator to replace the blade. This prevents uneven cut surfaces caused by severe blade wear during photovoltaic bracket cutting. During replacement, pulling pin 10 compresses spring 11, releasing pin 10 from its restraint on mounting block 6. The operator then pulls mounting block 6 to allow the cutting blade to... 7 can be removed, enabling quick tool replacement and reducing downtime during maintenance. The laser displacement sensor 29 detects the moving distance of the photovoltaic bracket. When the set distance is reached, the motor 21 is started, causing the threaded rod 22 to drive the connecting block 23 and the base plate 15 to move. The laser Doppler velocimeter 27, in cooperation with the square block on the bottom surface of the base plate 15, detects the moving speed of the base plate 15. When the speed is consistent with the moving speed of the photovoltaic bracket, the telescopic rod 18 is activated, causing the pressure block 19 to drive the limit rod 3 to press down, thereby causing the cutting blade 7 to cut the photovoltaic bracket. This achieves the effect of cutting without stopping the machine, improving production efficiency.

[0042] It should be noted that motor 21 is a servo motor used to realize the forward and reverse rotation of threaded rod 22, and telescopic rod 18 is hydraulically driven to realize the descent of limit rod 3.

[0043] The working principle of the above embodiments is as follows:

[0044] The photovoltaic bracket passes through the groove on the inner wall of the guide block 1. The moving distance of the photovoltaic bracket is detected by the laser displacement sensor 29. After reaching the set distance, the motor 21 is started, which causes the threaded rod 22 to drive the connecting block 23 and the base plate 15 to move. The moving speed of the base plate 15 is detected by the cooperation of the laser Doppler velocimeter 27 and the square block on the bottom surface of the base plate 15. When the speed is consistent with the moving speed of the photovoltaic bracket, the telescopic rod 18 is started, which causes the pressure block 19 to drive the limit rod 3 to press down. The limit rod 3 drives the mounting block 6 and the cutting blade 7 to descend, cutting the photovoltaic bracket. Then the telescopic rod 18 is reset, and the cutting blade 7 is controlled by the spring 4 and the damping rod 5. The resetting mechanism enables cutters to be cut without downtime, improving production efficiency. During cutting, the strain gauge 8 attached to the upper surface of the cutting blade 7 monitors the blade status in real time. When wear is severe, the cutting force increases. The blade status is identified by the sudden change in force signal, and the alarm 17 is activated to warn the operator to replace the blade. This prevents uneven cut surfaces caused by severe blade wear when cutting the photovoltaic bracket. When replacing the blade, pulling the pin 10 compresses the spring 11, releasing the pin 10 from the limit on the mounting block 6. The operator can then pull the mounting block 6 to remove the cutting blade 7, achieving quick blade replacement and reducing downtime during maintenance.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0046] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-stop cutting device for photovoltaic bracket processing, comprising a guide block (1) and an alarm (17), characterized in that: The upper surface of the guide block (1) is provided with a limiting groove (2). The inner wall of the limiting groove (2) is slidably connected to a limiting rod (3). The bottom surface of the limiting rod (3) is fixedly connected to a spring (4) and a damping rod (5). The bottom ends of the spring (4) and the damping rod (5) are fixedly connected to the inner bottom wall of the limiting groove (2). The inner wall of the limiting rod (3) is slidably connected to an installation block (6). The right side of the installation block (6) is fixedly connected to a cutting blade (7). The upper surface of the cutting blade (7) is provided with a strain gauge (8). The inside of the limiting rod (3) is provided with a sliding groove (9). The inner wall of the sliding groove (9) is slidably connected to a pin (10). The left side of the pin (10) is fixedly connected to two springs (11). The left end of each spring (11) is fixedly connected to the inner side wall of the sliding groove (9).

2. The photovoltaic bracket processing non-stop cutting device according to claim 1, characterized in that: The bottom surface of the guide block (1) is fixedly connected to a fixing block (12), and the outer surface of the fixing block (12) is slidably connected to a fixing seat (13). The inner wall of the fixing seat (13) is threadedly connected to an adjusting bolt (14), and the left end of the adjusting bolt (14) is rotatably connected to the right side of the guide block (1).

3. The photovoltaic bracket processing non-stop cutting device according to claim 2, characterized in that: A base plate (15) is fixedly installed on the bottom surface of the fixed base (13), and a mounting bracket (16) is fixedly connected to the upper surface of the base plate (15). The upper surface of the mounting bracket (16) is fixedly installed on the bottom surface of the alarm (17).

4. The photovoltaic bracket processing non-stop cutting device according to claim 3, characterized in that: A telescopic rod (18) is fixedly connected to the upper surface of the mounting bracket (16), and a pressure block (19) is fixedly connected to the output end of the telescopic rod (18).

5. The photovoltaic bracket processing non-stop cutting device according to claim 1, characterized in that: A mounting plate (20) is provided below the guide block (1), and a motor (21) and two guide rails (25) are fixedly connected to the upper surface of the mounting plate (20).

6. The photovoltaic bracket processing non-stop cutting device according to claim 5, characterized in that: The output shaft of the motor (21) is fixedly connected to a threaded rod (22), and a connecting block (23) is threadedly connected to the outer surface of the threaded rod (22). The upper surface of the connecting block (23) is fixedly connected to the bottom surface of the base plate (15).

7. The photovoltaic bracket processing non-stop cutting device according to claim 6, characterized in that: The outer surface of the threaded rod (22) is rotatably connected to two limiting members (24), the bottom surface of each limiting member (24) is fixedly connected to the upper surface of the mounting plate (20), and the outer surface of each guide rail (25) is slidably connected to a slider (26), the upper surface of each slider (26) is fixedly connected to the bottom surface of the base plate (15).

8. The photovoltaic bracket processing non-stop cutting device according to claim 5, characterized in that: A laser Doppler velocimeter (27) is mounted on the upper surface of the mounting plate (20), and a fixing rod (28) is fixedly mounted on the upper surface of the mounting plate (20). A laser displacement sensor (29) is fixedly mounted on the right end of the fixing rod (28).

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