Aluminum casting strength detection equipment

Abstract

The invention relates to the technical field of aluminum casting detection, in particular to aluminum casting strength detection equipment which comprises a bottom plate, stand columns are fixedly mounted on the upper surface of the bottom plate, a detection seat is fixedly arranged between the stand columns, a pressure applying table is fixedly mounted at the top ends of the stand columns, and hydraulic telescopic rods distributed in a rectangular array are fixedly mounted in the pressure applying table; a lifting plate is fixedly installed at the telescopic end of the hydraulic telescopic rod, a penetrating opening is formed in the outer wall of the lifting plate, a vertical plate is movably arranged in the penetrating opening, an abutting plate is fixedly installed at the top end of the vertical plate, and a pressing plate is fixedly installed at the bottom end of the vertical plate. According to the invention, flexible conversion between point pressure application and surface pressure application can be realized, the anti-pressure ability of the aluminum casting surface under different conditions can be detected, further, in the detection process, the aluminum casting can be shielded through the protection unit, the safety performance in the detection process can be effectively improved, and the use effect is better.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum casting detection, and in particular to an aluminum casting strength detection device. Background Art

[0002] Aluminum castings are widely used in many fields such as aerospace, automobile manufacturing, and mechanical processing due to their advantages such as light weight, high strength, and corrosion resistance. The strength of aluminum castings is directly related to the quality and safety of related products, so accurate testing of the strength of aluminum castings is crucial.

[0003] At present, most of the existing testing equipment has a single function and can only perform one type of strength test, which cannot meet the needs of comprehensive testing of multiple strength indicators of aluminum castings. In addition, there is a lack of certain protection during the testing process. When the aluminum casting breaks, the debris generated is easy to splash around, resulting in low safety performance during the testing process. Therefore, it is urgent to design an aluminum casting strength testing equipment to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the defects in the prior art and to provide an aluminum casting strength testing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] An aluminum casting strength testing device comprises a bottom plate, a column is fixedly installed on the upper surface of the bottom plate, and a testing seat is fixedly arranged between the columns, a pressure platform is fixedly installed on the top of the column, and hydraulic telescopic rods distributed in a rectangular array are fixedly installed in the pressure platform, a lifting plate is fixedly installed on the telescopic end of the hydraulic telescopic rod, a through hole is opened on the outer wall of the lifting plate, and a vertical plate is movably arranged in the through hole, a backing plate is fixedly installed on the top of the vertical plate, and a pressure plate is fixedly installed on the bottom end of the vertical plate, and also includes:

[0007] A conversion unit, which is arranged in the pressure plate and is used to realize the conversion between point pressure and surface pressure;

[0008] A pressure measuring unit, which is arranged above the lifting plate and is used to detect the pressure applied by the pressure plate;

[0009] A protection unit is arranged above the bottom plate and is used for protection during the detection process.

[0010] As a further solution of the present invention: the conversion unit includes a pressure block, the outer wall of the pressure plate is provided with a rotating opening, and the pressure block is movably arranged in the rotating opening, a stepper motor is fixedly installed on the outer wall of one side of the pressure plate, and the driving end of the stepper motor is rotatably connected with a rotating shaft, the pressure block is fixedly arranged on the outside of the rotating shaft, and a pressure rod is also fixedly installed on the outer wall of the pressure block, the outer wall of the pressure block on one side away from the pressure rod is flush with the lower surface of the pressure plate, and the outer wall of the pressure plate is also provided with a limiting component for limiting the position of the pressure block.

[0011] As a further solution of the present invention: the limiting assembly includes an electric telescopic rod fixedly arranged in the pressure plate, the telescopic end of the electric telescopic rod is fixedly installed with a displacement plate, the outer wall of the displacement plate close to the pressure plate is fixedly installed with an insertion rod, and the insertion rod is inserted into the pressure plate, and the side wall of the pressure block is also provided with a slot, and the end of the insertion rod is located in the slot.

[0012] As a further solution of the present invention: the pressure measuring unit includes a pressure measuring plate movably arranged above the abutment plate, a positioning rod is fixedly installed on the upper surface of the lifting plate, and the pressure measuring plate is sleeved on the outer side of the positioning rod, a baffle is fixedly installed on the top of the positioning rod, a pressure sensor is fixedly installed on the upper surface of the abutment plate, and the pressure sensor is located between the abutment plate and the pressure measuring plate, the upper surface of the lifting plate and the lower surface of the pressure measuring plate are connected by a first spring, a vertical rod is also fixedly installed on the upper surface of the lifting plate, and a side baffle is sleeved on the outer side of the vertical rod, and the lower surface of the side baffle The surface and the upper surface of the lifting plate are connected by a second spring, and the side baffle is located above the pressure measuring plate. A fixed cylinder is also fixedly installed on the upper surface of the lifting plate, and a movable rod is movably installed in the fixed cylinder, and a limiting plate is fixedly installed on the top of the movable rod. A fixed ring is fixedly installed on the outer wall of the fixed cylinder, and the upper surface of the fixed ring and the lower surface of the limiting plate are connected by a third spring. The limiting plate is located directly above the side baffle, and the stiffness coefficient of the third spring is greater than the stiffness coefficient of the second spring, and the stiffness coefficient of the second spring is greater than the stiffness coefficient of the first spring.

[0013] As a further solution of the present invention: the protection unit includes a protection plate, and the protection plate is fixedly arranged between adjacent columns. The outer side of the column is also rotatably connected to a protection door, and the outer side of the protection door is fixedly installed with a handle.

[0014] As a further solution of the present invention: a support block is fixedly installed on the inner side of the protective door, and the cross-section of the support block is L-shaped, so that the support block moves to the bottom of the pressure plate when the protective door is opened, and moves away from under the pressure plate when the protective door is closed. A touch switch is also fixedly installed on the upper surface of the support block, and a movable opening is opened on the outer wall of the protective plate, and the support block is located in the movable opening.

[0015] As a further solution of the present invention: the lower surface of the base plate is provided with fixing openings distributed in a rectangular array, and a telescopic cylinder is fixedly installed in the fixing opening, the telescopic end of the telescopic cylinder passes through the detection seat, and a rubber block is fixedly installed at the telescopic end of the telescopic cylinder.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides an aluminum casting strength testing device. The aluminum casting to be tested can be placed on a testing table, and then the lifting plate is driven downward by a hydraulic telescopic rod to make a pressure plate contact with the aluminum casting, so that the abutment plate connected to the vertical plate above the pressure plate applies pressure to a pressure measuring unit. With the help of the pressure measuring unit, pressure data can be monitored in real time, so that the pressure plate applies pressure to the aluminum casting according to a set pressure loading speed, thereby achieving the purpose of testing the pressure resistance of the aluminum casting. With the help of a conversion unit, flexible conversion between point pressure and surface pressure can be achieved, and the pressure resistance of the aluminum casting facing different conditions can be tested. Furthermore, during the testing process, the aluminum casting can also be shielded by a protective unit, which can effectively improve the safety performance during the testing process and achieve better use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure from a first perspective of an aluminum casting strength detection device provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure from a second viewing angle of an aluminum casting strength detection device provided by an embodiment of the present invention;

[0020] Figure 3 A schematic structural diagram of a lifting plate from a first perspective in an aluminum casting strength testing device provided by an embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the structure of a lifting plate in an aluminum casting strength testing device provided by an embodiment of the present invention from a second viewing angle;

[0022] Figure 5 A schematic diagram of a half-section structure of a lifting plate in an aluminum casting strength testing device provided by an embodiment of the present invention;

[0023] Figure 6 A schematic diagram of the structure of a pressure plate in an aluminum casting strength testing device provided by an embodiment of the present invention from a first perspective;

[0024] Figure 7 A schematic diagram of the structure of a pressure plate in an aluminum casting strength testing device provided by an embodiment of the present invention from a second viewing angle;

[0025] Figure 8A schematic diagram of the structure of a conversion unit in an aluminum casting strength testing device provided by an embodiment of the present invention;

[0026] Fig. 9 A schematic diagram of the structure from a third perspective of an aluminum casting strength detection device provided by an embodiment of the present invention;

[0027] Fig.10 A schematic diagram of the structure of a protective door in an aluminum casting strength testing device provided by an embodiment of the present invention;

[0028] Fig.11 A schematic structural diagram of a fourth viewing angle of an aluminum casting strength detection device provided in an embodiment of the present invention.

[0029] In the figure: 101-bottom plate, 102-column, 103-pressure platform, 104-hydraulic telescopic rod, 105-lifting plate, 106-retaining plate, 107-vertical plate, 108-pressure plate, 109-detection seat, 201-pressure block, 202-rotating shaft, 203-stepping motor, 204-pressure rod, 301-electric telescopic rod, 302-displacement plate, 303-insertion rod, 401-pressure plate, 402-positioning rod, 403- Baffle, 404-pressure sensor, 405-first spring, 406-side baffle, 407-vertical rod, 408-second spring, 409-fixing cylinder, 410-fixing ring, 411-limiting plate, 412-third spring, 413-movable rod, 501-protective plate, 502-protective door, 503-handle, 504-support block, 505-touch switch, 506-movable port, 601-telescopic cylinder, 602-rubber block. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0031] like Figure 1-Figure 11As shown, an aluminum casting strength testing device provided by an embodiment of the present invention includes a bottom plate 101, a column 102 is fixedly installed on the upper surface of the bottom plate 101, and a testing seat 109 is fixedly arranged between the columns 102, a pressure platform 103 is fixedly installed on the top of the column 102, and hydraulic telescopic rods 104 distributed in a rectangular array are fixedly installed in the pressure platform 103, and a lifting plate 105 is fixedly installed at the telescopic end of the hydraulic telescopic rod 104, and a through hole is opened on the outer wall of the lifting plate 105, and A vertical plate 107 is movably arranged in the through-opening, a counter plate 106 is fixedly installed on the top end of the vertical plate 107, and a pressure plate 108 is fixedly installed on the bottom end of the vertical plate 107, and also includes: a conversion unit, the conversion unit is arranged in the pressure plate 108, and is used to realize the conversion between point pressure and surface pressure; a pressure measuring unit, the pressure measuring unit is arranged above the lifting plate 105, and is used to detect the pressure applied by the pressure plate 108; a protection unit, the protection unit is arranged above the bottom plate 101, and is used for protection during the detection process.

[0032] The aluminum casting that needs to be tested can be placed on the testing table, and then the lifting plate 105 is driven downward by the hydraulic telescopic rod 104, so that the pressure plate 108 contacts the aluminum casting, prompting the abutment plate 106 connected to the vertical plate 107 above the pressure plate 108 to apply pressure to the pressure measuring unit. With the help of the pressure measuring unit, the pressure data can be monitored in real time, prompting the pressure plate 108 to apply pressure to the aluminum casting according to the set pressure loading speed, thereby achieving the purpose of testing the pressure resistance of the aluminum casting. With the help of the conversion unit, flexible conversion between point pressure and surface pressure can be achieved, and the pressure resistance of the aluminum casting facing different conditions can be tested. Furthermore, during the testing process, the aluminum casting can also be shielded by the protection unit, which can effectively improve the safety performance during the testing process and achieve better use effect.

[0033] As an embodiment of the present invention, please refer to Figure 6 , Figure 7 and Figure 8The conversion unit includes a pressure block 201. A rotating opening is provided on the outer wall of the pressure plate 108, and the pressure block 201 is movably arranged in the rotating opening. A stepper motor 203 is fixedly installed on one side of the outer wall of the pressure plate 108, and the driving end of the stepper motor 203 is rotatably connected to the rotating shaft 202. The pressure block 201 is fixedly arranged on the outer side of the rotating shaft 202. A pressure rod 204 is also fixedly installed on the outer wall of the pressure block 201. The outer wall of the pressure block 201 on one side away from the pressure rod 204 is flush with the lower surface of the pressure plate 108. A limiting component is also provided on the outer wall of the pressure plate 108 to limit the position of the pressure block 201. During normal detection, the pressure The outer wall of the pressure block 201 on one side away from the pressure rod 204 is flush with the lower surface of the pressure plate 108. When the pressure plate 108 moves downward, the pressure plate 108 and the pressure block 201 work together to achieve surface pressure on the aluminum casting. The stepper motor 203 can drive the rotating shaft 202 to rotate, and the rotating shaft 202 drives the pressure block 201 to rotate in the rotating mouth, so that the pressure rod 204 on the surface of the pressure block 201 can be aligned with the aluminum casting. When the pressure plate 108 moves downward, the end of the pressure rod 204 contacts the surface of the aluminum casting, so that point pressure on the aluminum casting can be achieved, effectively realizing flexible switching between point pressure and surface pressure, and it is very convenient to use.

[0034] As an embodiment of the present invention, please refer to Figure 7 and Figure 8 The limiting component includes an electric telescopic rod 301 fixedly arranged in the pressure plate 108, and a displacement plate 302 is fixedly installed on the telescopic end of the electric telescopic rod 301. A plug rod 303 is fixedly installed on the outer wall of the displacement plate 302 on one side close to the pressure plate 108, and the plug rod 303 is inserted into the pressure plate 108. A slot is also provided on the side wall of the pressure block 201, and the end of the plug rod 303 is located in the slot. After the pressure block 201 rotates, the electric telescopic rod 301 can drive the displacement plate 302 to move, and the displacement plate 302 drives the plug rod 303 to move, so that the plug rod 303 is inserted into the slot on one side of the pressure block 201, so that the position of the pressure block 201 can be limited to ensure the stability of the pressure block 201 during the detection process, and the use effect is better.

[0035] As an embodiment of the present invention, please refer to Figure 3 , Figure 4 and Figure 5The pressure measuring unit includes a pressure measuring plate 401 movably arranged above the back plate 106, a positioning rod 402 is fixedly installed on the upper surface of the lifting plate 105, and the pressure measuring plate 401 is sleeved on the outer side of the positioning rod 402, and a baffle 403 is fixedly installed on the top of the positioning rod 402, a pressure sensor 404 is fixedly installed on the upper surface of the back plate 106, and the pressure sensor 404 is located between the back plate 106 and the pressure measuring plate 401, the upper surface of the lifting plate 105 and the lower surface of the pressure measuring plate 401 are connected by a first spring 405, and a vertical rod 407 is also fixedly installed on the upper surface of the lifting plate 105, and a side baffle 406 is sleeved on the outer side of the vertical rod 407, and the lower surface of the side baffle 406 The upper surface of the lifting plate 105 is connected to the upper surface of the lifting plate 105 through a second spring 408, and the side baffle 406 is located above the pressure measuring plate 401. A fixed cylinder 409 is also fixedly installed on the upper surface of the lifting plate 105, and a movable rod 413 is movably installed in the fixed cylinder 409, and a limit plate 411 is fixedly installed on the top of the movable rod 413. A fixed ring 410 is fixedly installed on the outer wall of the fixed cylinder 409, and the upper surface of the fixed ring 410 and the lower surface of the limit plate 411 are connected through a third spring 412. The limit plate 411 is located just above the side baffle 406. The stiffness coefficient of the third spring 412 is greater than the stiffness coefficient of the second spring 408. The stiffness of the second spring 408 The coefficient is greater than the stiffness coefficient of the first spring 405. When the pressure plate 108 contacts the aluminum casting, as the lifting plate 105 moves downward further, the pressure sensor 404 between the pressure measuring plate 401 and the back plate 106 will be squeezed, thereby detecting the pressure force. As the lifting plate 105 moves downward, the back plate 106 will lift the pressure measuring plate 401, causing the first spring 405 to be stretched. When the pressure force gradually increases, the pressure measuring plate 401 will continue to move upward and contact the side baffle 406, and lift the side baffle 406, causing the second spring 408 with a larger stiffness coefficient to be stretched. As the pressure force further increases, the side baffle 406 continues to move upward and contact the limit baffle 406. The plate 411 contacts and lifts up the limit plate 411, prompting the movable rod 413 to move in the fixed cylinder 409, so that the third spring 412 with a larger stiffness coefficient is stretched. Through this detection method, it is possible to effectively avoid the hydraulic telescopic rod 104 directly driving the pressure measuring plate 401 to have a hard contact with the aluminum casting, making the pressure value easier to control and the detection more accurate. Furthermore, by setting the first spring 405, the second spring 408 and the third spring 412 with different stiffness coefficients, a wider range of pressure values ​​that can be detected can be achieved. At the same time, the changes in the pressure values ​​detected in different pressure range segments can also be more accurate, further improving the detection accuracy and achieving a better use effect.

[0036] As an embodiment of the present invention, please refer to Figure 1 , Figure 2 , Fig.10 and Fig.11The protection unit includes a protection plate 501, which is fixedly arranged between adjacent columns 102. A protection door 502 is rotatably connected to the outer side of the column 102, and a handle 503 is fixedly installed on the outer side of the protection door 502. The protection plate 501 can be used to shield the two sides and the rear of the testing platform. During the inspection, the protection door 502 is opened, and the aluminum casting is placed on the testing platform through the front of the testing platform. Then the protection door 502 is closed, which can shield the surroundings of the testing platform during the inspection process, and can effectively improve the safety of the inspection process.

[0037] As an embodiment of the present invention, please refer to Fig.10 and Fig.11 A support block 504 is fixedly installed on the inner side of the protective door 502, and the cross-section of the support block 504 is L-shaped. When the protective door 502 is opened, the support block 504 moves to the bottom of the pressure plate 108, and when the protective door 502 is closed, the support block 504 moves away from the bottom of the pressure plate 108. A touch switch 505 is also fixedly installed on the upper surface of the support block 504. The outer wall of the protective plate 501 is provided with a movable opening 506, and the support block 504 is located in the movable opening 506. When the protective door 502 is opened, the support block 504 will move with the protective door 502. When the equipment is accidentally touched and the pressure plate 108 moves downward, the pressure plate 108 will contact the touch switch 505 on the surface of the support block 504, prompting the hydraulic telescopic rod 104 to stop extending and retracting, thereby preventing the pressure plate 108 from moving further downward. Even if the touch switch 505 fails, the support block 504 can still block the pressure plate 108, thereby buying time for the staff to safely release their hands, greatly improving the safety performance during the detection process, and achieving better use effect.

[0038] As an embodiment of the present invention, please refer to Figure 1 and Figure 2 The lower surface of the base plate 101 is provided with fixing openings distributed in a rectangular array, and a telescopic cylinder 601 is fixedly installed in the fixing opening, the telescopic end of the telescopic cylinder 601 passes through the detection seat 109, and a rubber block 602 is fixedly installed at the telescopic end of the telescopic cylinder 601. Different rubber blocks 602 are extended to different heights by different telescopic cylinders 601, which is convenient for lifting irregularly shaped aluminum castings. At the same time, different surfaces of the aluminum castings can be aligned with the pressure plate 108, so as to achieve the purpose of comprehensively evaluating the strength performance of the aluminum castings, and the use effect is better.

[0039] During use, the aluminum casting to be inspected can be placed on the inspection table, and then the lifting plate 105 is driven downward by the hydraulic telescopic rod 104, so that the pressure plate 108 contacts the aluminum casting, prompting the abutment plate 106 connected to the vertical plate 107 above the pressure plate 108 to apply pressure to the pressure measuring unit. With the help of the pressure measuring unit, the pressure data can be monitored in real time, prompting the pressure plate 108 to apply pressure to the aluminum casting according to the set pressure loading speed, thereby achieving the purpose of detecting the pressure resistance of the aluminum casting. With the help of the conversion unit, flexible conversion between point pressure and surface pressure can be achieved, and the pressure resistance of the aluminum casting facing different conditions can be detected. Furthermore, during the detection process, the aluminum casting can also be shielded by the protection unit, which can effectively improve the safety performance during the detection process and achieve better use effect.

[0040] It should be particularly noted that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An aluminum casting strength testing device, comprising a bottom plate, characterized in that: The upper surface of the bottom plate is fixedly installed with a column, and a detection seat is fixedly arranged between the columns, a pressure platform is fixedly installed on the top of the column, and a hydraulic telescopic rod distributed in a rectangular array is fixedly installed in the pressure platform, and a lifting plate is fixedly installed on the telescopic end of the hydraulic telescopic rod, and a through hole is opened on the outer wall of the lifting plate, and a vertical plate is movably arranged in the through hole, a stop plate is fixedly installed on the top of the vertical plate, and a pressure plate is fixedly installed on the bottom end of the vertical plate, and also includes: A conversion unit, which is arranged in the pressure plate and is used to realize the conversion between point pressure and surface pressure; A pressure measuring unit, which is arranged above the lifting plate and is used to detect the pressure applied by the pressure plate; The protection unit is arranged above the bottom plate and is used for protection during the detection process.

2. The aluminum casting strength testing device according to claim 1, characterized in that: The conversion unit includes a pressure block, a rotating opening is opened on the outer wall of the pressure plate, and the pressure block is movably arranged in the rotating opening, a stepper motor is fixedly installed on the outer wall of one side of the pressure plate, and the driving end of the stepper motor is rotatably connected with a rotating shaft, the pressure block is fixedly arranged on the outside of the rotating shaft, and a pressure rod is also fixedly installed on the outer wall of the pressure block, the outer wall of the pressure block on one side away from the pressure rod is flush with the lower surface of the pressure plate, and the outer wall of the pressure plate is also provided with a limiting component for limiting the position of the pressure block.

3. The aluminum casting strength testing device according to claim 2, characterized in that: The limiting assembly includes an electric telescopic rod fixedly arranged in the pressure plate, the telescopic end of the electric telescopic rod is fixedly installed with a displacement plate, an insertion rod is fixedly installed on the outer wall of the displacement plate on one side close to the pressure plate, and the insertion rod is inserted into the pressure plate, and a slot is also opened on the side wall of the pressure block, and the end of the insertion rod is located in the slot.

4. The aluminum casting strength testing device according to claim 1, characterized in that: The pressure measuring unit includes a pressure measuring plate movably arranged above the abutment plate, a positioning rod is fixedly installed on the upper surface of the lifting plate, and the pressure measuring plate is sleeved on the outer side of the positioning rod, a baffle is fixedly installed on the top of the positioning rod, a pressure sensor is fixedly installed on the upper surface of the abutment plate, and the pressure sensor is located between the abutment plate and the pressure measuring plate, the upper surface of the lifting plate and the lower surface of the pressure measuring plate are connected by a first spring, a vertical rod is also fixedly installed on the upper surface of the lifting plate, and a side baffle is sleeved on the outer side of the vertical rod, and the lower surface of the side baffle and the upper surface of the lifting plate are connected. The surfaces are connected by a second spring, and the side baffle is located above the pressure measuring plate. A fixed cylinder is also fixedly installed on the upper surface of the lifting plate, and a movable rod is movably installed in the fixed cylinder. A limiting plate is fixedly installed on the top of the movable rod. A fixed ring is fixedly installed on the outer wall of the fixed cylinder, and the upper surface of the fixed ring and the lower surface of the limiting plate are connected by a third spring. The limiting plate is located directly above the side baffle, and the stiffness coefficient of the third spring is greater than the stiffness coefficient of the second spring, and the stiffness coefficient of the second spring is greater than the stiffness coefficient of the first spring.

5. The aluminum casting strength testing device according to claim 1, characterized in that: The protection unit comprises a protection plate, which is fixedly arranged between adjacent columns. The outer sides of the columns are also rotatably connected with protection doors, and the outer sides of the protection doors are fixedly installed with handles.

6. The aluminum casting strength testing device according to claim 5, characterized in that: A support block is fixedly installed on the inner side of the protective door, and the cross-section of the support block is L-shaped. When the protective door is opened, the support block moves to the bottom of the pressure plate, and when the protective door is closed, the support block moves away from under the pressure plate. A touch switch is also fixedly installed on the upper surface of the support block. A movable opening is opened on the outer wall of the protective plate, and the support block is located in the movable opening.

7. The aluminum casting strength testing device according to claim 1, characterized in that: The lower surface of the bottom plate is provided with fixing openings distributed in a rectangular array, and a telescopic cylinder is fixedly installed in the fixing opening, the telescopic end of the telescopic cylinder passes through the detection seat, and a rubber block is fixedly installed at the telescopic end of the telescopic cylinder.

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