Steel plate elasticity detection device

Abstract

The utility model relates to the technical field of steel plate elasticity detection, in particular to a steel plate elasticity detection device which comprises a workbench. A sliding rail is installed on the workbench, sliding plates are installed on the two sliding blocks correspondingly, a C-shaped cover plate is rotatably installed at the upper end of the vertical plate, a supporting plate is installed on the side face of the vertical plate, first sleeves are installed on the outer sides of the two side plates correspondingly, first limiting rods are installed on the outer side faces of first baffles correspondingly, and first springs are arranged in the first sleeves correspondingly. The two ends of a steel plate are placed on two supporting plates, a C-shaped cover plate is rotationally arranged on the upper portion of the steel plate, a first baffle can drive a pin shaft to retract into a first sleeve when moving, the pin shaft can extend out of a side plate again under the action of a first spring, and after steel plate detection is completed, a first limiting plate is pulled again to enable the pin shaft to retract into the first sleeve; and the purpose of rapid clamping and fixing is achieved, the detection efficiency is effectively improved, and the steel plate elasticity detection device is more convenient to use compared with a traditional steel plate elasticity detection device.

Description

Technical Field

[0001] This utility model relates to the field of steel plate elasticity testing technology, specifically a steel plate elasticity testing device. Background Technology

[0002] Steel plates are products of the metallurgical industry, mainly used in the manufacture of ships, machinery and other fields. Steel plates are mainly made by melting and shaping or rolling metal. In order to ensure that the steel plates meet the needs of production and use, the elasticity of the steel plates needs to be tested after the steel plates are produced and processed.

[0003] Existing steel plate elasticity testing mainly consists of a clamping mechanism, a hydraulic mechanism, and a pressure sensor. The clamping mechanism clamps and fixes the steel plate, and the hydraulic mechanism applies a certain tension or pressure to the steel plate to cause plastic deformation. The elasticity of the steel plate is then detected by observing the amount of plastic deformation. The pressure sensor is used to monitor the pressure or tension data of the hydraulic device.

[0004] However, existing steel plate elasticity testing devices are inconvenient for fixing steel plates, resulting in inconvenient clamping and affecting testing efficiency; therefore, a steel plate elasticity testing device is proposed to address the above problems. Utility Model Content

[0005] To overcome the shortcomings of existing technologies and address the problems existing in existing technologies, this utility model proposes a steel plate elasticity testing device.

[0006] The technical solution adopted by this utility model to solve its technical problem is as follows: A steel plate elasticity testing device of this utility model includes a worktable; a slide rail is installed on the worktable, and two sliders are symmetrically arranged on the slide rail. Each slider is equipped with a sliding plate, and each sliding plate is equipped with a vertical plate. A C-shaped cover plate is rotatably installed on the upper end of each vertical plate, and a rotating shaft is rotatably installed inside the opening of the C-shaped cover plate. A support plate is installed on the side of each vertical plate, and the support plate is located between the C-shaped cover plate and the sliding plate. Side plates are installed on each of the two sliding plates. A sleeve is installed on each of the outer sides, and a pin is installed inside each sleeve. A baffle is installed at the outer end of each of the two pins, and a limiting rod is installed on the outer side of each baffle. A spring is installed inside each sleeve, and the baffle is located between the spring and the side plate. The ends of the two pins pass through the two side plates and are set on the upper side of the ends of the two C-shaped cover plates. The working ends of the two pins are symmetrically arranged inward, which achieves the purpose of quick tightening and fixing, effectively improving the detection efficiency. Compared with the traditional steel plate elasticity detection device, it is more convenient to use.

[0007] Preferably, the two sliding plates are parallel to each other and both sliding plates are parallel to each other on the worktable. Both sliding plates are perpendicular to each other on the slide rail. The two upright plates are perpendicular to each other on the sliding plates. The rotating shaft is parallel to each other on the sliding plates. The C-shaped cover plate is set with its opening facing downward. This combination achieves the function of fixing both ends of the steel plate so as to inspect the steel plate.

[0008] Preferably, the side plates are perpendicular to the sliding plate, and the two side plates are perpendicular to the two C-shaped cover plates. The two side plates are located outside the ends of the two C-shaped cover plates, and the rotating shaft is located directly above the support plate. This combination achieves the function of fixing the steel plate, which is more convenient for fixing and clamping the steel plate compared with the traditional steel plate elasticity detection device.

[0009] Preferably, the pin is perpendicular to the side plate, the first limiting rod is perpendicular to the side plate, and the end of the first limiting rod passes through the first sleeve to install a first limiting plate. The two first limiting plates are located at the outer ends of the two first limiting rods, which together achieve the function of fixing the end of the C-shaped cover plate to the lower side of the pin, so as to fix and clamp the steel plate.

[0010] Preferably, each support plate is equipped with a second sleeve, each second sleeve contains a second baffle, each second baffle has a second limiting rod installed through it, each second limiting rod has a second limiting plate installed on it, each second sleeve contains a second spring located below the second baffle, and the second limiting plate is located below the C-shaped cover port. This combination achieves the effect of allowing the C-shaped cover to quickly spring open after it is opened.

[0011] Preferably, a transmission block is installed under each of the two sliding plates, and a threaded hole is opened through the side of each of the two transmission blocks. A bidirectional screw is installed through the threaded hole. Two fixed plates are installed in parallel on the worktable. The bidirectional screw is rotatably disposed between the two fixed plates. A motor is installed on the worktable. The output of the motor is installed at the end of the bidirectional screw through a fixed plate on one side. The two transmission blocks are symmetrically disposed at both ends of the bidirectional screw. The transmission blocks and the slider are symmetrically disposed at the lower part of both ends of the sliding plates. The bidirectional screw and the slide rail are parallel to each other. The cooperation achieves the effect of improving the detection efficiency and is more convenient to use compared with the traditional steel plate elasticity detection device.

[0012] Preferably, a hydraulic cylinder is installed under the workbench, and a hydraulic rod is provided with the working end of the hydraulic cylinder facing upward. A pressure sensor is installed through the upper end of the hydraulic rod through the workbench, and a push rod is installed on the pressure sensor. The push rod is located between two sliding plates and is parallel to the two sliding plates. Two holes are opened through the workbench, and a No. 3 limit rod is installed through each of the two holes. The upper end of the No. 3 limit rod is installed under the push rod, and the lower end is installed with a No. 3 limit plate. This achieves the function of pushing the steel plate to produce plastic deformation, ensuring the normal use of the steel plate elasticity detection device.

[0013] The advantages of this utility model are:

[0014] 1. This utility model places a steel plate on two support plates, with a C-shaped cover plate rotating and positioned on top of the steel plate. Pulling the first limiting plate moves the first limiting rod, causing the first baffle to move outwards. This movement of the first baffle retracts the pin into the first sleeve. Continuing to rotate the C-shaped cover plate so that its end is below the pin, the pin extends outwards from the side plate under the action of the first spring and is positioned above the end of the C-shaped cover plate. After the steel plate is inspected, pulling the first limiting plate again retracts the pin into the first sleeve. At this point, the end of the C-shaped cover plate springs upwards under the action of the second spring. Rotating the C-shaped cover plate allows the steel plate to be removed for the next inspection. This achieves rapid tightening and fixing, effectively improving inspection efficiency and making it more convenient to use compared to traditional steel plate elasticity testing devices.

[0015] 2. This utility model utilizes a bidirectional screw that rotates to drive transmission blocks at both ends to move along the screw. The two transmission blocks move inward or outward simultaneously at both ends of the bidirectional screw. When the hydraulic rod moves upward, it drives the pressure sensor and push rod at its end to move upward. When the push rod moves upward, it pushes the middle section of the steel plate upward. When the middle section of the steel plate is subjected to force, it bends upward and produces plastic deformation. This combination improves the detection efficiency and is more convenient to use compared to traditional steel plate elasticity detection devices. Attached Figure Description

[0016] 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 drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first three-dimensional main structure;

[0018] Figure 2 This is a partially enlarged schematic diagram of the main structure of the sliding component;

[0019] Figure 3 This is an enlarged schematic diagram of the main structure of the sliding plate assembly;

[0020] Figure 4 This is a partially enlarged schematic diagram of the main structure of the clamping component;

[0021] Figure 5 This is a partially enlarged cross-sectional view of the main structure of the pin assembly.

[0022] Figure 6 This is a partially enlarged cross-sectional view of the main structure of the clamping component;

[0023] Figure 7 This is an enlarged schematic diagram of area A in the main structure diagram of the clamping component;

[0024] Figure 8 This is a partially enlarged cross-sectional view of the main structure of the hydraulic assembly.

[0025] In the diagram: 1. Workbench; 2. Slide rail; 3. Slider; 4. Sliding plate; 5. Transmission block; 6. Bidirectional screw; 7. Fixing plate; 701. Motor; 8. Vertical plate; 9. C-shaped cover plate; 10. Rotating shaft; 11. Support plate; 12. Side plate; 13. Sleeve No. 1; 14. Pin; 15. Baffle No. 1; 16. Limiting rod No. 1; 17. Spring No. 1; 18. Limiting plate No. 1; 19. Sleeve No. 2; 20. Baffle No. 2; 21. Limiting rod No. 2; 22. Spring No. 2; 23. Limiting plate No. 2; 24. Hydraulic cylinder; 25. Hydraulic rod; 26. Pressure sensor; 27. Push rod; 28. Limiting rod No. 3; 29. ​​Limiting plate No. 3. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] Please see Figure 1-8As shown, a steel plate elasticity testing device includes a worktable 1; a slide rail 2 is mounted on the worktable 1, and two sliders 3 are symmetrically arranged on the slide rail 2. Each slider 3 is equipped with a sliding plate 4, and each sliding plate 4 is equipped with a vertical plate 8. A C-shaped cover plate 9 is rotatably mounted on the upper end of each vertical plate 8, and a rotating shaft 10 is rotatably mounted inside the opening of the C-shaped cover plate 9. A support plate 11 is mounted on the side of each vertical plate 8, and the support plate 11 is located between the C-shaped cover plate 9 and the sliding plate 4. Side plates 12 are mounted on each of the two sliding plates 4, and a [missing information - likely a device or component] is mounted on the outer side of each of the two side plates 12. Each of the first sleeves 13 has a pin 14 installed inside. A baffle 15 is installed at the outer end of each of the two pins 14. A limiting rod 16 is installed on the outer side of each baffle 15. A spring 17 is installed inside each of the first sleeves 13, and the baffle 15 is located between the spring 17 and the side plate 12. The ends of the two pins 14 pass through the two side plates 12 and are positioned on the upper side of the ends of the two C-shaped cover plates 9. The working ends of the two pins 14 are symmetrically arranged inwards. The two sliding plates 4 are parallel to each other, and both sliding plates 4 are aligned with the worktable. 1. Parallel to each other, both sliding plates 4 are perpendicular to the slide rail 2, both upright plates 8 are perpendicular to the sliding plates 4, the rotating shaft 10 is parallel to the sliding plates 4, the C-shaped cover plate 9 is set with its opening facing downward, the side plates 12 are perpendicular to the sliding plates 4, and the two side plates 12 are perpendicular to the two C-shaped cover plates 9, the two side plates 12 are located outside the ends of the two C-shaped cover plates 9, the rotating shaft 10 is located directly above the support plate 11, the pin 14 is perpendicular to the side plates 12, the first limiting rod 16 is perpendicular to the side plates 12, and the end of the first limiting rod 16 is perpendicular to the side plates 12. A first limiting plate 18 is installed through the first sleeve 13. The two first limiting plates 18 are located at the outer ends of the two first limiting rods 16 respectively. A second sleeve 19 is installed on each of the support plates 11. A second baffle 20 is provided inside each of the second sleeves 19. A second limiting rod 21 is installed through the support plate 11 on each of the second baffles 20. A second limiting plate 23 is installed on each of the second limiting rods 21. A second spring 22 is provided inside each of the second sleeves 19, and the second spring 22 is located below the second baffle 20. The second limiting plate 23 is located on the lower side of the port of the C-shaped cover plate 9.

[0028] During operation, existing steel plate elasticity detection devices are inconvenient for fixing the steel plate, resulting in inconvenient clamping and affecting detection efficiency. In this solution, in the initial state, the two No. 1 springs 17 will always push the No. 1 baffle 15 inward, causing the end of the pin 14 to protrude and be located inside the two side plates 12. In the initial state, the No. 2 spring 22 will always push the No. 2 baffle 20 upward, causing the No. 2 limiting rod 21 to extend upward beyond the upper surface of the support plate 11. By adjusting the two sliding plates 4 to the appropriate position according to the size of the steel plate, the steel plate is placed... On the two support plates 11, rotate the C-shaped cover plate 9 so that it is rotated and positioned on the upper part of the steel plate. When the end of the C-shaped cover plate 9 rotates to the side plate 12, pull the first limiting plate 18. At this time, the first limiting rod 16 will move with the first limiting plate 18. When the first limiting rod 16 moves, it will drive the first baffle 15 to move outward. When the first baffle 15 moves, it will drive the pin 14 to retract into the first sleeve 13. Continue to rotate the C-shaped cover plate 9 so that the end of the C-shaped cover plate 9 is below the pin 14. Then, release the first limiting plate 18. Under the action of the first spring 17, the pin 14 will extend out of the side plate 12 and be located on the upper side of the end of the C-shaped cover plate 9. Together with the support plate 11, it will fix the steel plate between the rotating shaft 10 and the support plate 11. When the C-shaped cover plate 9 rotates to the second limiting plate 23, the end of the C-shaped cover plate 9 needs to be pressed downwards. During this pressing, the end of the C-shaped cover plate 9 will press downwards against the second limiting plate 23. When the second limiting plate 23 moves downwards, it will compress the second spring 22 downwards through the second limiting rod 21 and the second baffle 20, thus fixing the steel plate with the pin 14. Fixed on the support plate 11, under the action of the second spring 22, the second limiting plate 23 will always push the end of the C-shaped cover plate 9 upward. After the steel plate is inspected, the first limiting plate 18 is pulled again to retract the pin 14 into the first sleeve 13. At this time, under the action of the second spring 22, the end of the C-shaped cover plate 9 will spring upward. Then, by rotating the C-shaped cover plate 9, the steel plate can be taken out to be used for the next steel plate to be inspected. This achieves the purpose of quick tightening and fixing, effectively improving the inspection efficiency. Compared with the traditional steel plate elasticity detection device, it is more convenient to use.

[0029] Please see Figure 1As shown, each of the two sliding plates 4 has a transmission block 5 installed below it. Each of the two transmission blocks 5 has a threaded hole through its side, and a bidirectional screw 6 is installed through the threaded hole. Two fixed plates 7 are installed parallel to each other on the worktable 1. The bidirectional screw 6 is rotatably positioned between the two fixed plates 7. A motor 701 is installed on the worktable 1. The output of the motor 701 is installed at the end of the bidirectional screw 6 through one of the fixed plates 7. The two transmission blocks 5 are symmetrically arranged at both ends of the bidirectional screw 6. The transmission blocks 5 and the slider 3 are symmetrically arranged at the lower ends of the sliding plates 4. The bidirectional screw... 6 is parallel to the slide rail 2. A hydraulic cylinder 24 is installed under the worktable 1. A hydraulic rod 25 is set upward at the working end of the hydraulic cylinder 24. A pressure sensor 26 is installed through the upper end of the hydraulic rod 25 through the worktable 1. A push rod 27 is installed on the pressure sensor 26. The push rod 27 is located between the two sliding plates 4 and is parallel to the two sliding plates 4. Two holes are opened through the worktable 1. A third limit rod 28 is installed through the two holes. The upper end of the third limit rod 28 is installed under the push rod 27, and the lower end is installed with a third limit plate 29.

[0030] During operation, to ensure the normal use of the steel plate elasticity testing device in this solution and improve testing efficiency, the motor 701 is started. After starting, the motor 701 drives the bidirectional screw 6 to rotate. When the bidirectional screw 6 rotates, it drives the transmission blocks 5 at both ends to move on the bidirectional screw 6. Under the limit of the sliding plate 4, the two transmission blocks 5 will move inward or outward at both ends of the bidirectional screw 6. After the steel plate is fixed, the hydraulic cylinder 24 extends the hydraulic rod 25 upward. When the hydraulic rod 25 moves upward, it drives the pressure sensor 26 and the push rod 27 at its end to move upward. When the push rod 27 moves upward, it pushes the middle section of the steel plate upward. When the middle section of the steel plate is under force, it will bend upward and produce plastic deformation. This combination achieves the effect of improving testing efficiency and is more convenient to use compared with the traditional steel plate elasticity testing device.

[0031] Working principle: Existing steel plate elasticity testing devices are inconvenient for fixing the steel plate, leading to clamping difficulties and affecting testing efficiency. In this solution, in the initial state, two springs 17 will continuously push the first baffle 15 inwards, causing the pin 14 to protrude and be located inside the two side plates 12. In the initial state, spring 22 will continuously push the second baffle 20 upwards, causing the second limiting rod 21 to extend upwards beyond the upper surface of the support plate 11. By adjusting the two sliding plates 4 to the appropriate positions according to the size of the steel plate, the steel plate is placed... Placed on two support plates 11, the C-shaped cover plate 9 is rotated so that it is rotatably positioned on the upper part of the steel plate. When the end of the C-shaped cover plate 9 rotates to the side plate 12, the first limiting plate 18 is pulled. At this time, the first limiting rod 16 will move with the first limiting plate 18. When the first limiting rod 16 moves, it will drive the first baffle 15 to move outward. When the first baffle 15 moves, it will drive the pin 14 to retract into the first sleeve 13. At this time, continue to rotate the C-shaped cover plate 9 so that the end of the C-shaped cover plate 9 is below the pin 14. Then, the first limiting plate 18 is released. Under the action of the first spring 17, the pin 14 will extend out of the side plate 12 and be located on the upper side of the end of the C-shaped cover plate 9. Together with the support plate 11, it will fix the steel plate between the rotating shaft 10 and the support plate 11. When the C-shaped cover plate 9 rotates to the second limiting plate 23, the end of the C-shaped cover plate 9 needs to be pressed downwards. During this pressing, the end of the C-shaped cover plate 9 will press downwards against the second limiting plate 23. When the second limiting plate 23 moves downwards, it will compress the second spring 22 downwards through the second limiting rod 21 and the second baffle 20, thus fixing the steel plate with the pin 14. Fixed on the support plate 11, under the action of the second spring 22, the second limiting plate 23 will always push the end of the C-shaped cover plate 9 upward. After the steel plate is inspected, the first limiting plate 18 is pulled again to retract the pin 14 into the first sleeve 13. At this time, under the action of the second spring 22, the end of the C-shaped cover plate 9 will spring upward. Then, by rotating the C-shaped cover plate 9, the steel plate can be taken out to be used for the next steel plate to be inspected. This achieves the purpose of quick tightening and fixing, effectively improving the inspection efficiency. Compared with the traditional steel plate elasticity detection device, it is more convenient to use.

[0032] To ensure the normal operation of the steel plate elasticity testing device in this solution and improve testing efficiency, the solution utilizes a starting motor 701. The starting motor 701 drives the bidirectional screw 6 to rotate, which in turn moves the transmission blocks 5 at both ends of the screw 6. Under the constraint of the sliding plate 4, the two transmission blocks 5 move inward or outward simultaneously at both ends of the bidirectional screw 6. After the steel plate is fixed, the hydraulic cylinder 24 extends the hydraulic rod 25 upward. As the hydraulic rod 25 moves upward, it drives the pressure sensor 26 and push rod 27 at its end to move upward. The push rod 27 then pushes upward against the middle section of the steel plate. Under this force, the middle section of the steel plate bends upward, resulting in plastic deformation. This combination improves testing efficiency and makes the solution more convenient to use compared to traditional steel plate elasticity testing devices.

[0033] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A steel plate elasticity testing device, characterized in that: Includes a workbench (1); a slide rail (2) is installed on the workbench (1), two sliders (3) are symmetrically arranged on the slide rail (2), a sliding plate (4) is installed on each of the two sliders (3), a vertical plate (8) is installed on each of the two sliding plates (4), a C-shaped cover plate (9) is rotatably installed on the upper end of the vertical plate (8), a rotating shaft (10) is rotatably installed in the opening of the C-shaped cover plate (9), a support plate (11) is installed on the side of the vertical plate (8), and the support plate (11) is located between the C-shaped cover plate (9) and the sliding plate (4), a side plate (12) is installed on each of the two sliding plates (4), and the two side plates (12) are installed on each of the two sliding plates (4). A sleeve (13) is installed on the outer side of the plate (12). A pin (14) is installed inside the sleeve (13). A baffle (15) is installed at the outer end of each of the two pins (14). A limiting rod (16) is installed on the outer side of the baffle (15). A spring (17) is installed inside the sleeve (13). The baffle (15) is located between the spring (17) and the side plate (12). The ends of the two pins (14) pass through the two side plates (12) and are set on the upper side of the ends of the two C-shaped cover plates (9). The working ends of the two pins (14) are symmetrically arranged inward.

2. The steel plate elasticity testing device according to claim 1, characterized in that: The two sliding plates (4) are parallel to each other, and both sliding plates (4) are parallel to each other on the worktable (1). Both sliding plates (4) are perpendicular to each other on the slide rail (2). The two upright plates (8) are perpendicular to each other on the sliding plates (4). The rotating shaft (10) is parallel to each other on the sliding plates (4). The C-shaped cover plate (9) is set with its opening facing downward.

3. The steel plate elasticity testing device according to claim 1, characterized in that: The side plate (12) is perpendicular to the sliding plate (4), and the two side plates (12) are perpendicular to the two C-shaped cover plates (9). The two side plates (12) are located outside the ends of the two C-shaped cover plates (9), and the rotating shaft (10) is located directly above the support plate (11).

4. The steel plate elasticity testing device according to claim 3, characterized in that: The pin (14) is perpendicular to the side plate (12), the first limiting rod (16) is perpendicular to the side plate (12), the end of the first limiting rod (16) passes through the first sleeve (13) and is fitted with a first limiting plate (18), and the two first limiting plates (18) are located at the outer ends of the two first limiting rods (16) respectively.

5. The steel plate elasticity testing device according to claim 4, characterized in that: Each of the support plates (11) is equipped with a second sleeve (19), and each of the second sleeves (19) is equipped with a second baffle (20). Each of the second baffles (20) is equipped with a second limiting rod (21) that passes through the support plate (11). Each of the second limiting rods (21) is equipped with a second limiting plate (23). Each of the second sleeves (19) is equipped with a second spring (22), and the second spring (22) is located below the second baffle (20). The second limiting plate (23) is located below the port of the C-shaped cover plate (9).

6. The steel plate elasticity testing device according to claim 5, characterized in that: A transmission block (5) is installed under each of the two sliding plates (4). A threaded hole is opened through the side of each of the two transmission blocks (5). A bidirectional screw (6) is installed through the threaded hole. Two fixed plates (7) are installed in parallel on the worktable (1). The bidirectional screw (6) is rotatably arranged between the two fixed plates (7). A motor (701) is installed on the worktable (1). The output of the motor (701) is installed at the end of the bidirectional screw (6) through the fixed plate (7) on one side. The two transmission blocks (5) are symmetrically arranged at both ends of the bidirectional screw (6). The transmission blocks (5) and the slider (3) are symmetrically arranged at the lower part of both ends of the sliding plate (4). The bidirectional screw (6) and the slide rail (2) are parallel to each other.

7. The steel plate elasticity testing device according to claim 6, characterized in that: A hydraulic cylinder (24) is installed under the workbench (1). A hydraulic rod (25) is provided on the working end of the hydraulic cylinder (24) facing upward. A pressure sensor (26) is installed on the upper end of the hydraulic rod (25) through the workbench (1). A push rod (27) is installed on the pressure sensor (26). The push rod (27) is located between two sliding plates (4) and is parallel to the two sliding plates (4). Two holes are opened through the workbench (1). A third limit rod (28) is installed through both holes. The upper end of the third limit rod (28) is installed under the push rod (27), and the lower end is installed with a third limit plate (29).

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