A U-shaped dynamic bending experimental device for corrugated metal hoses

Abstract

The present invention discloses a U-shaped dynamic bending experimental device for corrugated metal hoses, which relates to the technical field of bending experiments. It includes a support frame, on the surface of which a guide rail is fixedly installed. A moving block is slidably installed on the surface of the guide rail, and an inflation device is fixedly installed on the surface of the moving block. A pushing device is fixedly installed on the surface of the support frame, and the output end of the pushing device is fixed to the moving block. An inflation device is arranged on the surface of the moving block. Among them, a support plate, a pushing plate, a trapezoidal block, an elastic telescopic block and a control rod are arranged on the surface of the pushing device. The support plate is slidably installed on the surface of the output end of the pushing device. The metal hose can be conveniently bent through the pushing plate. The trapezoidal block and the elastic telescopic block can perform one-way limiting on the pushing plate and the metal hose, avoiding the danger caused by the rebound of the metal hose and facilitating the insertion of the metal hose into the interior of the inflation device.

Description

Technical Field

[0001] The present invention relates to the technical field of bending experiments, and particularly to a U-shaped dynamic bending experiment device for corrugated metal hoses. Background Art

[0002] A U-shaped dynamic bending experiment device for metal hoses is a device used to test the performance and durability of metal hoses under dynamic bending conditions.

[0003] The patent with the patent announcement number CN206876510U relates to a U-shaped dynamic bending experiment device for corrugated metal hoses, belonging to the technical field of experimental devices and methods. This experimental device consists of a pumping station system, a DC motor, a motor control cabinet, a transmission lead screw, a movable guide rail, a movable slider, a fixed guide rail, a fixed slider, a pipe joint fixing frame, and an installation frame. The corrugated pipe is a hose. This experimental device adopts the design scheme of a DC motor plus a lead screw to achieve the U-shaped reciprocating motion design of the corrugated metal hose. It can not only easily adjust the reciprocating motion frequency of the corrugated metal hose and record the number of bending times, but also control the DC motor through programming, thereby completing the control of the number of bending times and the motion accuracy. In addition, high-precision wear-resistant ball lead screws and slider guide rails are used to achieve the conversion and transmission of motion, meeting the requirements of the experiment for durability and adjustable dynamic bending radius.

[0004] In the above patent, high-precision wear-resistant ball lead screws and slider guide rails are used to achieve the conversion and transmission of motion, meeting the requirements of the experiment for durability and adjustable dynamic bending radius. However, when detecting the corrugated metal hose, it is necessary to bend the corrugated metal hose. Due to the certain strength of the corrugated metal hose, it is necessary for multiple staff members to bend the corrugated metal hose. At the same time, the corrugated metal hose is prone to deviation during the bending experiment, affecting the bending effect of the corrugated metal hose. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a U-shaped dynamic bending experiment device for corrugated metal hoses, which solves the problems raised in the above background art.

[0006] To achieve the above object, the present invention is realized through the following technical solutions: A U-shaped dynamic bending experiment device for corrugated metal hoses, including a support frame, on the surface of the support frame is fixedly installed a guide rail, on the surface of the guide rail is slidably installed a moving block, on the surface of the moving block is fixedly installed an inflation device, on the surface of the support frame is fixedly installed a pushing device, the output end of the pushing device is fixed to the moving block, and an inflation device is arranged on the surface of the moving block; wherein, on the surface of the pushing device are provided a support plate, a pushing plate, a trapezoidal block, an elastic telescopic block and a control rod, the support plate is slidably installed on the surface of the output end of the pushing device, the pushing plate is slidably installed at the bottom of the support plate, the trapezoidal block is fixedly installed on the surface of the support plate, the elastic telescopic block is fixedly installed at the top of the pushing plate, the control rod is fixedly installed on the free end surface of the elastic telescopic block, an arc-shaped groove is formed on the surface of the pushing plate, when the pushing plate moves, the inclined surface at the bottom of the trapezoidal block will push the free end of the elastic telescopic block to move downward intermittently, and the trapezoidal block will have a one-way limiting effect on the elastic telescopic block, so that the trapezoidal block will limit the elastic telescopic block and the pushing plate from moving away from the inflation device.

[0007] According to the above technical solution, a support block is slidably installed at the output end of the pushing device, the bottom of the support block is fixed to the top of the pushing plate, a sliding rod is slidably penetrated through the inside of the pushing plate, an arc-shaped plate is rotatably installed in the arc-shaped groove, a pressing rod is rotatably installed at the bottom of the support block, when the pressing rod rotates, it will push the sliding rod to move labor-savingly, and when the arc-shaped plate rotates, it will push the top of the metal hose to move towards the bottom of the inflation device, avoiding the nozzle of the metal hose from fitting inside the arc-shaped groove and being unable to move towards the inflation device.

[0008] According to the above technical solution, the sliding rod contacts the arc-shaped plate, a torsion spring is arranged between the arc-shaped plate and the arc-shaped groove, the pressing rod contacts the sliding rod, so that when the sliding rod moves, it will push the arc-shaped plate to rotate.

[0009] According to the above technical solution, a protection device for reducing the moving speed of the pushing plate is arranged on the surface of the support plate, a positioning device is arranged on the surface of the moving block, the protection device includes a cylinder, a piston plate, a connecting rod, a delivery pipe, a moving plate and a fixed block, when the pushing plate moves, it will push the connecting rod and the piston plate to move, when the piston plate moves, it will squeeze the air inside the cylinder into the inside of the delivery pipe, the cylinder is fixedly installed at the bottom of the support plate, the piston plate is slidably installed inside the cylinder, the piston plate is fixed to the pushing plate through the connecting rod, the delivery pipe is fixedly installed at the bottom of the cylinder, the moving plate is slidably installed at the bottom of the delivery pipe, the fixed block is fixedly installed inside the delivery pipe, and through holes are formed on the surface of the moving plate.

[0010] According to the above technical solution, a jet plate is fixedly installed inside the arc-shaped groove, and the conveying pipe is communicated with the inside of the jet plate through a pipeline. When the piston plate moves, it will squeeze the air inside the cylinder and spray it out from the jet plate through the conveying pipe. The air sprayed out by the jet plate will blow away foreign matters at the nozzle of the metal hose, preventing the existence of foreign matters at the nozzle of the metal hose from affecting the sealing performance with the inflation device.

[0011] According to the above technical solution, a first spring is arranged between the moving plate and the conveying pipe, a one-way valve is arranged inside the conveying pipe, and one-way valves are arranged on both the left and right sides of the cylinder. The one-way valve inside the conveying pipe enables the conveying pipe to only exhaust air, and the one-way valves on both sides of the cylinder can only intake air into the cylinder.

[0012] According to the above technical solution, the positioning device includes a guide plate, an elastic telescopic rod, a clamping rod, a sleeve plate, a movable plate, a concave plate, an arc-shaped frame, a roller and an L-shaped block. When the sleeve plate moves upward, it will drive the movable plate and the concave plate to move upward. When the concave plate moves upward, the groove position of the concave plate is parallel to the guide plate, and the guide plate will not be able to limit the concave plate. The guide plate is fixedly installed on the surface of the moving block, the elastic telescopic rod is fixedly installed at the bottom of the guide plate, the sleeve plate is fixedly installed at the bottom of the elastic telescopic rod, the movable plate is slidably installed on the top of the sleeve plate, the concave plate is fixedly installed on the top of the movable plate, the arc-shaped frame is fixedly installed on the surface of the movable plate, the roller is rotatably installed inside the arc-shaped frame, the L-shaped block is fixedly installed on the top of the sleeve plate, and the clamping rod is slidably installed on the surface of the moving block.

[0013] According to the above technical solution, the clamping rod contacts the top of the L-shaped block, so that the clamping rod can limit the L-shaped block. A second spring is arranged between the clamping rod and the moving block, and a return spring is arranged between the movable plate and the sleeve plate.

[0014] The present invention provides a U-shaped dynamic bending experiment device for corrugated metal hoses. It has the following beneficial effects:

[0015] (1) In this invention, the arc-shaped groove on the pushing plate can limit the position of the metal hose, and it is convenient to bend the metal hose through the pushing plate. The trapezoidal block and the elastic telescopic block can perform one-way limit on the pushing plate and the metal hose, avoiding the danger caused by the rebound of the metal hose and facilitating the insertion of the metal hose into the inflation device. At the same time, the sliding rod will push the arc-shaped plate to rotate, and when the arc-shaped plate rotates, it will push the nozzle of the metal hose to bend, and the bending of the nozzle of the metal hose is convenient for aligning the nozzle of the metal hose with the inflation device.

[0016] (2)When the metal hose is detached from the inflation device in this invention, the elastic force of the metal hose will push the push plate to move rapidly away from the inflation device. When the push plate moves, it will push the connecting rod and the piston plate to move. When the piston plate moves, it will push the air inside the cylinder into the inside of the delivery pipe. The moving plate inside the delivery pipe will reduce the exhaust speed of the delivery pipe, thereby reducing the moving speeds of the piston plate and the push plate and avoiding the danger caused by the rapid movement of the metal hose pushing the push plate.

[0017] (3)When the arc-shaped plate rotates in this invention, it will push the positioning rod to move. The movement of the positioning rod will release the limitation on the L-shaped block and the sleeve plate. The elastic telescopic rod will drive the sleeve plate to move upward. The concave-shaped plate will release the limitation on the movable plate and the arc-shaped frame, enabling the arc-shaped frame and the rollers to clamp the metal hose, allowing the arc-shaped frame and the rollers to guide the metal hose, and enabling the metal hose to be inserted more accurately into the inside of the inflation device. Description of the Drawings

[0018] Figure 1 Schematic diagram of the overall structure of the present invention;

[0019] Figure 2 Schematic diagram of the position structure of the moving block and the support plate of the present invention;

[0020] Figure 3 Schematic diagram of the cross-sectional structure of the push plate of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure of part A in;

[0022] Figure 5 Schematic diagram of the position structure of the delivery pipe and the moving plate of the present invention;

[0023] Figure 6 Schematic diagram of the position structure of the positioning rod and the moving block of the present invention;

[0024] Figure 7 Schematic diagram of the position structure of the sleeve plate and the movable plate of the present invention.

[0025] In the figure: 1, support frame; 2, guide rail; 3, moving block; 4, pushing device; 5, inflation device; 6, support plate; 7, push plate; 8, trapezoidal block; 9, elastic telescopic block; 10, control rod; 11, support block; 12, sliding rod; 13, arc-shaped plate; 14, pressing rod; 151, cylinder; 152, piston plate; 153, connecting rod; 154, delivery pipe; 155, jet plate; 156, moving plate; 157, fixed block; 161, guide plate; 162, elastic telescopic rod; 163, positioning rod; 164, sleeve plate; 165, movable plate; 166, concave-shaped plate; 167, arc-shaped frame; 168, roller; 169, L-shaped block. Detailed implementation mode

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1 - 4 , an embodiment of the present invention is: a U-shaped dynamic bending test device for a corrugated metal hose, including a support frame 1, a guide rail 2 is fixedly installed on the surface of the support frame 1, a moving block 3 is slidably installed on the surface of the guide rail 2, an inflation device 5 is fixedly installed on the surface of the moving block 3, a pushing device 4 is fixedly installed on the surface of the support frame 1, the output end of the pushing device 4 is fixed to the moving block 3, and an inflation device 5 is arranged on the surface of the moving block 3; wherein, a support plate 6, a pushing plate 7, a trapezoidal block 8, an elastic telescopic block 9 and a control rod 10 are arranged on the surface of the pushing device 4, the support plate 6 is slidably installed on the surface of the output end of the pushing device 4, the pushing plate 7 is slidably installed at the bottom of the support plate 6, the trapezoidal block 8 is fixedly installed on the surface of the support plate 6, the elastic telescopic block 9 is fixedly installed on the top of the pushing plate 7, the control rod 10 is fixedly installed on the free end surface of the elastic telescopic block 9, and an arc-shaped groove is formed on the surface of the pushing plate 7. The corrugated metal hose can be bent conveniently through the pushing plate 7, and the trapezoidal block 8 and the elastic telescopic block 9 can perform one-way limit on the pushing plate 7 and the corrugated metal hose, avoiding the danger caused by the rebound of the corrugated metal hose and facilitating the insertion of the corrugated metal hose into the inflation device 5.

[0028] A support block 11 is slidably installed at the output end of the pushing device 4, the bottom of the support block 11 is fixed to the top of the pushing plate 7, a sliding rod 12 is slidably penetrated through the inside of the pushing plate 7, an arc-shaped plate 13 is rotatably installed inside the arc-shaped groove, and a pressing rod 14 is rotatably installed at the bottom of the support block 11. When the pressing rod 14 rotates, it will push the sliding rod 12 to move with less effort. When the arc-shaped plate 13 rotates, it will push the top of the corrugated metal hose to move towards the bottom of the inflation device 5, avoiding the pipe orifice of the corrugated metal hose from fitting inside the arc-shaped groove and being unable to move towards the inflation device 5.

[0029] The sliding rod 12 is in contact with the arc-shaped plate 13, a torsion spring is arranged between the arc-shaped plate 13 and the arc-shaped groove, the pressing rod 14 is in contact with the sliding rod 12, and when the sliding rod 12 moves, it will push the arc-shaped plate 13 to rotate.

[0030] During the operation of this embodiment: When the metal hose needs to be inserted into the interior of the inflation device 5, manually bend the metal hose by a small angle and fit it against the push plate 7 inside the arc-shaped groove. Push the push plate 7 in the direction of the inflation device 5. When the push plate 7 moves, it will push the metal hose to bend further. When the push plate 7 moves, the inclined surface at the bottom of the trapezoidal block 8 will intermittently push the free end of the elastic telescopic block 9 downward. The trapezoidal block 8 will have a one-way limiting effect on the elastic telescopic block 9, so that the trapezoidal block 8 will limit the elastic telescopic block 9 and the push plate 7 from moving away from the inflation device 5. When the metal hose reaches the bottom of the inflation device 5, push the bottom of the pressing rod 14 in the direction of the push plate 7. When the push plate 7 rotates, it will push the sliding rod 12 in the direction of the arc-shaped plate 13. The movement of the sliding rod 12 will push the arc-shaped plate 13 to rotate. When the arc-shaped plate 13 rotates, it will push the nozzle of the metal hose towards the bottom of the inflation device 5. After the nozzle of the metal hose is inserted into the interior of the inflation device 5, the inflation device 5 will inject high-pressure air into the metal hose. The pushing device 4 will push the moving block 3 and the inflation device 5 to move to conduct a bending experiment on the metal hose.

[0031] Please refer to Figures 1 - 7 , on the basis of the above embodiment, in another embodiment of the present invention, a protection device for reducing the moving speed of the push plate 7 is provided on the surface of the support plate 6, and a positioning device is provided on the surface of the moving block 3. The protection device includes a cylinder 151, a piston plate 152, a connecting rod 153, a delivery pipe 154, a moving plate 156 and a fixing block 157. The moving plate 156 inside the delivery pipe 154 will reduce the exhaust speed of the delivery pipe 154, thereby reducing the moving speed of the piston plate 152 and the push plate 7, and avoiding the danger caused by the rapid movement of the metal hose pushing the push plate 7. The cylinder 151 is fixedly installed at the bottom of the support plate 6. The piston plate 152 is slidably installed inside the cylinder 151. The piston plate 152 is fixed to the push plate 7 through the connecting rod 153. The delivery pipe 154 is fixedly installed at the bottom of the cylinder 151. The moving plate 156 is slidably installed at the bottom of the delivery pipe 154. The fixing block 157 is fixedly installed inside the delivery pipe 154. Through holes are provided on the surface of the moving plate 156.

[0032] An air jet plate 155 is fixedly installed inside the arc-shaped groove. The delivery pipe 154 is communicated with the inside of the air jet plate 155 through a pipeline. When the piston plate 152 moves, it will squeeze the air inside the cylinder 151 and spray it out from the air jet plate 155 through the delivery pipe 154. The air sprayed out by the air jet plate 155 will blow away foreign matters at the nozzle of the metal hose, preventing the existence of foreign matters at the nozzle of the metal hose from affecting the sealing performance with the inflation device 5.

[0033] A first spring is provided between the moving plate 156 and the conveying pipe 154. A one-way valve is provided inside the conveying pipe 154, and one-way valves are provided on the left and right sides of the air cylinder 151. The one-way valve inside the conveying pipe 154 enables the conveying pipe 154 to only exhaust air, and the one-way valves on both sides of the air cylinder 151 can only intake air into the inside of the air cylinder 151.

[0034] The positioning device includes a guide plate 161, an elastic telescopic rod 162, a clamping rod 163, a sleeve plate 164, a movable plate 165, a concave plate 166, an arc-shaped frame 167, a roller 168, and an L-shaped block 169. The arc-shaped frame 167 and the roller 168 clamp the metal hose, enabling the arc-shaped frame 167 and the roller 168 to guide the metal hose, so that the metal hose can be inserted into the inflation device 5 more accurately. The guide plate 161 is fixedly installed on the surface of the moving block 3, the elastic telescopic rod 162 is fixedly installed at the bottom of the guide plate 161, the sleeve plate 164 is fixedly installed at the bottom of the elastic telescopic rod 162, the movable plate 165 is slidably installed on the top of the sleeve plate 164, the concave plate 166 is fixedly installed on the top of the movable plate 165, a groove is formed on the surface of the concave plate 166, the arc-shaped frame 167 is fixedly installed on the surface of the movable plate 165, the roller 168 is rotatably installed inside the arc-shaped frame 167, the L-shaped block 169 is fixedly installed on the top of the sleeve plate 164, and the clamping rod 163 is slidably installed on the surface of the moving block 3.

[0035] The clamping rod 163 contacts the top of the L-shaped block 169, enabling the clamping rod 163 to limit the L-shaped block 169. A second spring is provided between the clamping rod 163 and the moving block 3, and a return spring is provided between the movable plate 165 and the sleeve plate 164.

[0036] When this embodiment works: When the metal hose detaches from the bottom of the inflation device 5, the self-elastic force of the metal hose will quickly reset. When the metal hose resets, it will abut against the surface of the push plate 7. Manually push the control rod 10 downward. The downward movement of the control rod 10 will drive the free end of the elastic telescopic block 9 to move downward. The downward movement of the free end of the elastic telescopic block 9 will disengage from the trapezoidal block 8, enabling the trapezoidal block 8 to release the limit on the elastic telescopic block 9 and the push plate 7. The metal hose will push the push plate 7 to move away from the inflation device 5. When the push plate 7 moves, it will push the connecting rod 153 and the piston plate 152 to move. When the piston plate 152 moves, it will squeeze the air inside the air cylinder 151 into the inside of the conveying pipe 154. The gas inside the conveying pipe 154 will be discharged through the through holes on the moving plate 156. The through holes will reduce the speed of the air discharge inside the conveying pipe 154, causing the reduction of the gas discharge speed inside the air cylinder 151 to reduce the moving speed of the piston plate 152, the connecting rod 153, and the push plate 7, avoiding the danger caused by the too-fast moving speed of the metal hose pushing the push plate 7.

[0037] When the arc-shaped plate 13 rotates, it will push the clamping rod 163 to move. When the clamping rod 163 moves, it will disengage from the L-shaped block 169. The clamping rod 163 will release the limit on the L-shaped block 169 and the sleeve plate 164. The elastic force of the elastic telescopic rod 162 will drive the sleeve plate 164 to move upward. When the sleeve plate 164 moves upward, it will drive the movable plate 165 and the concave plate 166 to move upward. When the concave plate 166 moves upward, the groove position of the concave plate 166 is parallel to the guide plate 161, and the guide plate 161 will not be able to limit the concave plate 166. The elastic force of the return spring will drive the movable plate 165 and the concave plate 166 to move towards each other. When the movable plate 165 moves, it will drive the arc-shaped frame 167 and the roller 168 to move. When the roller 168 moves, it will clamp the metal hose, so that the metal hose can be inserted into the interior of the inflation device 5 more accurately. At the same time, the arc-shaped frame 167 and the roller 168 will pull the nozzle of the metal hose towards the inflation device 5.

[0038] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A corrugated metal hose U-shaped dynamic bending test device, comprising a support frame, characterized in that: A guide rail is fixedly installed on the surface of the support frame, a moving block is slidably installed on the surface of the guide rail, a pushing device is fixedly installed on the surface of the support frame, the output end of the pushing device is fixed to the moving block, and an inflatable device is provided on the surface of the moving block; The surface of the pushing device is provided with a support plate, a pushing plate, a trapezoidal block, an elastic telescopic block and a control rod, the support plate is slidably mounted on the surface of the output end of the pushing device, the pushing plate is slidably mounted on the bottom of the support plate, the trapezoidal block is fixedly mounted on the surface of the support plate, the elastic telescopic block is fixedly mounted on the top of the pushing plate, the control rod is fixedly mounted on the free end surface of the elastic telescopic block, and the surface of the pushing plate is provided with an arc groove; Wherein, a protective device for reducing the moving speed of the push plate is provided on the surface of the support plate, and a positioning device is provided on the surface of the moving block; The protection device comprises a cylinder, a piston plate, a connecting rod, a delivery pipe, a movable plate and a fixed block, wherein the cylinder is fixedly mounted on the bottom of the support plate, the piston plate is slidably mounted inside the cylinder, the piston plate is fixed to the push plate through the connecting rod, the delivery pipe is fixedly mounted on the bottom of the cylinder, the movable plate is slidably mounted on the bottom of the delivery pipe, the fixed block is fixedly mounted inside the delivery pipe, and a through hole is opened on the surface of the movable plate; When the metal hose detaches from the bottom of the inflator, the metal hose will push the push plate to move away from the inflator. When the push plate moves, it will push the connecting rod and the piston plate to move. When the piston plate moves, it will squeeze the air inside the cylinder into the inside of the delivery pipe. The gas inside the delivery pipe will be discharged through the through holes on the moving plate. The through holes will reduce the speed at which the air inside the delivery pipe is discharged. The reduced speed of gas discharge in the cylinder will reduce the moving speed of the piston plate, connecting rod and push plate, thereby preventing the metal hose from pushing the push plate to move too fast and causing danger.

2. A corrugated metal hose U-shaped dynamic bending test device according to claim 1, characterized in that: A support block is slidably installed at the output end of the pushing device, the bottom of the support block is fixed to the top of the pushing plate, a sliding rod slides through the inside of the pushing plate, an arc plate is rotatably installed inside the arc groove, and a pressing rod is rotatably installed at the bottom of the support block.

3. A U-shaped dynamic bending test device for a corrugated metal hose according to claim 2, characterized in that: The slide bar contacts the arc plate, a torsion spring is arranged between the arc plate and the arc groove, and the pressing bar contacts the slide bar.

4. A U-shaped dynamic bending test device for a corrugated metal hose according to claim 3, characterized in that: An air jet plate is fixedly installed inside the arc-shaped groove, and the delivery pipe is communicated with the inside of the air jet plate through a pipeline.

5. A U-shaped dynamic bending test device for a corrugated metal hose according to claim 4, characterized in that: A No. 1 spring is arranged between the moving plate and the delivery pipe, a one-way valve is arranged inside the delivery pipe, and one-way valves are arranged on the left and right sides of the cylinder.

6. A U-shaped dynamic bending test device for a corrugated metal hose according to claim 5, characterized in that: The positioning device includes a guide plate, an elastic telescopic rod, a locking rod, a sleeve plate, a movable plate, a concave plate, an arc frame, a roller and an L-shaped block. The guide plate is fixedly mounted on the surface of the movable block, the elastic telescopic rod is fixedly mounted on the bottom of the guide plate, the sleeve plate is fixedly mounted on the bottom of the elastic telescopic rod, the movable plate is slidably mounted on the top of the sleeve plate, the concave plate is fixedly mounted on the top of the movable plate, the arc frame is fixedly mounted on the surface of the movable plate, the roller is rotatably mounted inside the arc frame, the L-shaped block is fixedly mounted on the top of the sleeve plate, and the locking rod is slidably mounted on the surface of the movable block.

7. A corrugated metal hose U-shaped dynamic bending test device according to claim 6, characterized in that: The locking rod is in contact with the top of the L-shaped block, a No. 2 spring is arranged between the locking rod and the moving block, and a return spring is arranged between the movable plate and the sleeve plate.

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