A tensile test tooling for copper alloy used in elevator safety tongs

Abstract

The present invention discloses a tensile test tooling for a copper alloy used in an elevator safety tongs, which relates to the technical field of tensile tests and aims to solve the technical problem that it is difficult to simulate the impact situation that the copper alloy used in the safety tongs may encounter during actual use in a tensile test. The tooling includes a base, a fixing table is arranged inside the base, a top plate is arranged above the base, an impact tensile assembly is arranged between the base and the top plate, and a slow tensile assembly is arranged between the fixing table and the top plate. The slow tensile assembly includes an upper pulling plate, a lower pulling plate and a limiting plate. The impact tensile assembly includes a cyclic impact assembly and a step-by-step impact assembly arranged above the cyclic impact assembly and above the lower pulling plate. The present invention has the advantages of being able to test the response of the copper alloy raw material when subjected to a suddenly applied tensile impact force, and simulating various force-bearing tensile states during the actual braking process when the copper alloy raw material is used for an elevator safety tongs.

Description

Technical Field

[0001] The present invention relates to the technical field of tensile test, and more specifically, to a tensile test tooling for copper alloy used in elevator safety gear. Background Art

[0002] The elevator safety gear is a crucial safety protection device for elevators. The elevator safety gear is a device that, under the control of a speed governor, when the elevator speed exceeds the limit speed set by the elevator speed governor, or in the case of a break or slack of the suspension rope, urgently stops the car and clamps it on the guide rail, ensuring that the elevator will not fall freely, thereby protecting the lives of passengers; copper alloy has high strength and hardness and is commonly used to manufacture key components such as the jaws and wedges of elevator safety gears. It can withstand large impact forces and frictional forces when the elevator safety gear is working, ensuring the effective braking and clamping of the elevator car by the safety gear to prevent the car from falling or sliding at high speed; during the production process, tensile tests on copper alloy raw materials or finished products can test whether the material quality is stable and whether it meets the design and process requirements, helping to promptly discover problems and take measures to improve the production process to ensure product quality.

[0003] When the existing tensile test equipment conducts a tensile test on copper alloy raw materials, it usually applies a tensile force in a straight line direction to the copper alloy raw materials until the copper alloy raw materials break to obtain indicators such as the strength and elongation rate of the copper alloy. However, for the copper alloy used in elevator safety gears, the loading rate of the tensile test is usually relatively slow and stable, while in the actual operation of the elevator safety gear, its braking process is often instantaneous and the loading rate is very fast, resulting in the tensile test being difficult to simulate the impact conditions that the copper alloy used in the safety gear may encounter in actual use and difficult to test the performance of the material under impact conditions. In view of this, we propose a tensile test tooling for copper alloy used in elevator safety gears. Summary of the Invention

[0004] The purpose of the present invention is to provide a tensile test tooling for copper alloy used in elevator safety gears to solve the technical problem that the tensile test is difficult to simulate the impact conditions that the copper alloy used in the safety gear may encounter in actual use.

[0005] To solve the above technical problems, the present invention provides the following technical solution: A copper alloy tensile test tooling for an elevator safety tongs, including a base, a fixed table is arranged inside the base, a top plate is arranged above the base, an impact tensile assembly is arranged between the base and the top plate, and a slow tensile assembly is arranged between the fixed table and the top plate; The slow tensile assembly includes an upper pull plate and a lower pull plate, and a plurality of limit holes and movable holes are opened in the lower pull plate from top to bottom. A limit plate fixedly connected to the top of the fixed table is arranged in the limit hole, and the limit plate is used to limit the upper limit of the rise of the lower pull plate; The impact tensile assembly includes a cyclic impact assembly and a step-by-step impact assembly arranged above the lower pull plate, and the step-by-step impact assembly is arranged above the cyclic impact assembly; The cyclic impact assembly is used to apply an instantaneous impact force to the top of the lower pull plate in a cycle, and perform a cyclic impact tensile test on the copper alloy raw material. The step-by-step impact assembly is used to apply a gradually increasing instantaneous impact force to the top of the lower pull plate, and perform multiple incremental impact tensile tests on the copper alloy raw material.

[0006] Preferably, the slow tensile assembly further includes a plurality of sliding rods and a plurality of driving covers arranged between the fixed table and the top plate; The lower pull plate is movably arranged on the sliding rod, the driving cover is arranged in the movable hole with a gap, a hydraulic cylinder connected to the top of the fixed table is arranged inside the driving cover, and the output end of the hydraulic cylinder is connected to the bottom of the upper pull plate; Two buffer pads are detachably arranged on the top of the fixed table, and the buffer pads are plate-shaped structures made of rubber.

[0007] Preferably, an upper clamp is connected to the bottom of the upper pull plate, a lower clamp is connected to the top of the lower pull plate, the upper clamp and the lower clamp are arranged at intervals along the same vertical axis, and both ends of the copper alloy raw material are clamped and fixed through the upper clamp and the lower clamp respectively; The limit plate is an L-shaped plate structure, the protruding structure at the top of the limit plate is arranged above the lower pull plate, and the lower pull plate is movably matched with the limit plate through the limit hole.

[0008] Preferably, the top of the base and the bottom of the top plate are connected through a plurality of wheel frames and a plurality of rod frames. Every two of the wheel frames form a group, and there are two groups of wheel frames. The rod frames are arranged on the side of the wheel frames. The cyclic impact assembly includes two half gears, and the two half gears are respectively rotatably arranged on the side walls of the two groups of wheel frames. The half gears are coaxially connected with worm gears. A rotating rod is rotatably arranged between the two rod frames. Two worms with opposite thread directions are arranged on the circumferential outer wall of the rotating rod. The worms are meshed and connected with the worm gears. A motor one is also arranged on the top of the base, and the output end of the motor one is connected with a bevel gear one. The bevel gear one is meshed and connected with a bevel gear two, and the side wall of the bevel gear two is connected with one end of the rotating rod.

[0009] Preferably, the cyclic impact assembly further includes an impact plate. A plurality of top columns are connected to the top of the impact plate. The impact plate and the top columns penetrate through the slide rod from top to bottom. The impact plate is slidably matched with the slide rod. A toothed plate is connected to one side wall of the impact plate. The toothed plate is meshed and connected with the semi-gear. A square hole is formed in the top surface of the impact plate. The drive cover is arranged in the square hole. A planar structure is arranged on the circumferential outer wall of the semi-gear. The planar structure is used for the semi-gear and the toothed plate to form a separated state.

[0010] Preferably, the step-by-step impact assembly includes a first gear, a second gear and a drive gear rotatably arranged on the top of the top plate. An equipment rack is further arranged on the top of the top plate. A second motor is arranged on the top of the equipment rack. The output end of the second motor is connected to the drive gear. The drive gear is meshed and connected with the first gear. The first gear is meshed and connected with the second gear. Among them, the first gear is coaxially connected with a third bevel gear through a rotating column movably penetrating through the bottom of the top plate. The second gear and the first gear are provided with the same structural components.

[0011] Preferably, two insertion / separation assemblies are arranged at the bottom of the top plate. The two insertion / separation assemblies are arranged in a symmetrical structure. A plurality of impact blocks in a stacked state are arranged between the two insertion / separation assemblies. One of the insertion / separation assemblies includes a plurality of support plates and a plurality of fixed frames connected to the bottom of the top plate. An upper insertion plate and a lower insertion plate are arranged in the inner cavity of the fixed frame. The side walls of the upper insertion plate and the lower insertion plate are respectively provided with chutes with the same structure. A plurality of convex plate structures matching the chutes are connected to the inner cavity side wall of the fixed frame. The upper insertion plate and the lower insertion plate are slidably matched with the inner cavity of the fixed frame through the chutes.

[0012] Preferably, a plurality of first tooth openings are arranged at the bottom of the upper insertion plate. A plurality of second tooth openings are arranged at the top of the lower insertion plate. A transmission gear is arranged between the upper insertion plate and the lower insertion plate. The transmission gear is respectively meshed and connected with the first tooth opening and the second tooth opening. The transmission gear is rotatably arranged between the two support plates. The transmission gear is coaxially connected with a fourth bevel gear. The fourth bevel gear is meshed and connected with the third bevel gear.

[0013] Preferably, the upper insertion plate includes a plug. A plurality of roller columns are rotatably arranged at the top of the plug. A baffle is connected to the side wall of the plug. A bevel structure is arranged at the bottom of the plug. The lower insertion plate has the same structure as the plug.

[0014] Preferably, sliding holes with the same structure are provided at the four corners of the impact block. The impact block is slidably arranged on the sliding rod through the sliding holes. A hole with the same structure as the square hole is provided in the impact block from top to bottom. A first groove is provided on one side wall of the impact block. A movable plate is rotatably arranged in the first groove. An insertion channel is formed below the movable plate. A limiting block is integrally formed at the top of the first groove. The limiting block is arranged above the movable plate. An arc-shaped column is connected to the inner side wall of the first groove. The arc-shaped column penetrates the side wall of the movable plate and is movably matched with the movable plate. An arc-shaped spring is sleeved on the arc-shaped column. The arc-shaped spring is arranged at the bottom of the movable plate. A second groove is provided on the other side wall of the impact block. The second groove is arranged in a symmetric structure with the first groove. A structural component symmetric to that in the first groove is arranged in the second groove.

[0015] A method for using a tensile test tooling for a copper alloy used in an elevator safety gear includes the following steps:

[0016] S1. Continuously apply a tensile force in a linear direction to the copper alloy raw material. When it is necessary to test various mechanical property indexes of the copper alloy raw material under normal stress conditions, the two ends of the copper alloy raw material are respectively clamped and fixed by an upper clamp and a lower clamp. At this time, the upper pull plate and the lower pull plate are connected through the copper alloy raw material. The hydraulic cylinder inside the driving cover is used to push the upper pull plate upward. The upper pull plate drives the lower pull plate upward through the copper alloy raw material until the upward movement of the top of the lower pull plate is restricted by the limiting plate. By continuously moving the upper pull plate upward, a continuous tensile force is applied to the copper alloy raw material until the copper alloy raw material breaks, and the tensile test is completed.

[0017] S2. Conduct a tensile test operation of applying an instantaneous impact force to the copper alloy raw material. When it is necessary to simulate the stress and tensile state of the copper alloy raw material during the actual braking process of the elevator safety gear, first fix the copper alloy raw material between the upper pull plate and the lower pull plate. By adjusting the upward movement of the upper pull plate, after the upward movement of the top of the lower pull plate is restricted by the limiting plate, adjust the upper pull plate to maintain this height and form a static state. Then, an impact tensile component is used to apply a vertically downward impact force to the top of the lower pull plate, driving the lower pull plate to generate a downward tensile force on the copper alloy raw material, forming an impact-type tensile test.

[0018] S2.1. Tensile test operation of applying instantaneous impact force to the copper alloy raw material in a cycle. When the first motor works, it drives the rotating rod to rotate. The rotating rod drives two worm wheels to rotate in opposite directions through two worms with opposite thread directions, further driving two symmetrically distributed half-gears to rotate in opposite directions until the planar structure of the half-gear is separated from the toothed plate. At this time, the toothed plate loses the support of the half-gear, causing the impact plate to fall vertically under the influence of its own gravity, exerting an impact force on the top of the lower pull plate, so that the lower pull plate applies an instantaneous impact tensile force to the copper alloy raw material. As the half-gear continues to rotate until the half-gear and the toothed plate re-establish a meshing relationship, the rotation of the half-gear drives the toothed plate to rise, and then the impact plate rises and resets. The half-gear continues to rotate until the planar structure of the half-gear is separated from the toothed plate again, causing the impact plate to fall vertically again, exerting an impact force on the top of the lower pull plate again, forming a cycle until the copper alloy raw material breaks, completing the tensile test of applying instantaneous impact force to the copper alloy raw material in a cycle;

[0019] S2.2. Tensile test operation of applying gradually increasing instantaneous impact force to the copper alloy raw material. After the impact plate falls vertically on the top of the lower pull plate through the operation of S2.1, stop the rotation of the half-gear to keep the impact plate in the state on the top of the lower pull plate. Then, drive the driving gear to rotate through the second motor. The driving gear drives the first gear to rotate, and the first gear drives the second gear to rotate synchronously in the opposite direction. The first gear also drives the bevel gear three to rotate synchronously through the rotating column. The bevel gear three drives the transmission gear to rotate through the bevel gear four. The transmission gear drives the upper insertion plate and the lower insertion plate to move synchronously in the horizontal direction in the opposite direction, that is, the lower insertion plate inserts into the insertion channel of the impact block, and the upper insertion plate leaves the insertion channel of another impact block. The second gear is the same as the first gear, driving another set of upper insertion plates and lower insertion plates to move synchronously in the horizontal direction in the opposite direction. Moreover, the two lower insertion plates will simultaneously insert into the two insertion channels of the impact block respectively, and the other two upper insertion plates will respectively leave the insertion channels of another impact block at the same time. When the second motor rotates in the reverse direction, the upper insertion plate will enter the insertion channel, and the lower insertion plate will leave the insertion channel. By alternately rotating the second motor forward and backward, multiple impact blocks will fall downward one by one, exerting an impact force on the top of the lower pull plate. Each impact block will increase the impact force applied to the top of the lower pull plate on the basis of the previous impact block, achieving the tensile test of applying gradually increasing instantaneous impact force to the copper alloy raw material until the copper alloy raw material breaks;

[0020] S3. Reset operation: After completing the tensile test operation on the copper alloy, relative to the inner cavity of the fixed frame, adjust the lower insertion plate to the extended state and the upper insertion plate to the retracted state. Then continue to rotate the semi-gear until the semi-gear and the toothed plate re-form a meshing relationship. The rotation of the semi-gear drives the toothed plate to rise, thereby causing the impact plate to rise. The impact plate pushes the multiple stacked impact blocks above it to rise through multiple ejector posts. When the impact blocks rise below the lower insertion plate in the extended state, as the impact blocks continue to rise, the plug structure of the lower insertion plate will press on the top of the movable plate, driving the movable plate to rotate so that the impact blocks can continue to rise until the impact blocks enter above the lower insertion plate. The movable plate rotates and resets under the elastic force of the arc spring, keeping the movable plate above the lower insertion plate. When all the impact blocks enter above the lower insertion plate, reverse-rotate the semi-gear to separate the ejector posts on the top of the impact plate from the impact blocks. The impact blocks descend, and the bottom of the movable plate lands on the top of the plug structure of the lower insertion plate, forming a supporting effect to complete the reset operation.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. By designing a cyclic impact component and a step-by-step impact component above the lower pull plate, the present invention uses the cyclic impact component to apply an instantaneous impact force to the top of the lower pull plate cyclically, and the step-by-step impact component to apply a gradually increasing instantaneous impact force to the top of the lower pull plate, which can test the response of the copper alloy raw material when suddenly subjected to a tensile impact force, understand the ability of the copper alloy raw material to resist impact damage, and simulate various stress and tensile states during the actual braking process when the copper alloy raw material is used in an elevator safety clamp, thereby improving the effectiveness and comprehensiveness of the tensile test and solving the problem that it is difficult to simulate the impact conditions that the copper alloy used in the safety clamp may encounter in actual use during the tensile test.

[0023] 2. By changing the structure of the existing tensile test tooling, the lower pull plate is movably arranged on the sliding rod, and a limiting plate fixedly connected to the top of the fixed table is arranged in the limiting hole of the lower pull plate. The limiting plate is designed as an L-shaped plate structure, with the protruding structure on the top of the limiting plate arranged above the lower pull plate. The limiting plate can limit the upper limit of the rise of the lower pull plate, enabling the lower pull plate to freely lift within a limited height. When performing the tensile test operation of applying an instantaneous impact force to the copper alloy raw material, by adjusting the upper pull plate to move upward, after the top of the lower pull plate is restricted from rising by the limiting plate, adjust the upper pull plate to maintain at this height to form a static state. Then, apply a vertically downward impact force to the top of the lower pull plate through the impact and tensile component. The lower pull plate can transmit the impact force to the copper alloy raw material, generating a downward tensile force on the copper alloy raw material. If the copper alloy raw material breaks, the lower pull plate can quickly descend and land on the buffer pad to unload the impact force, which is beneficial to providing a better impact environment for the tensile test of the instantaneous impact force.

[0024] 3. The present invention designs two symmetrically arranged semi-gears, and a planar structure is provided on the circumferential outer wall of the semi-gears. During the continuous rotation of the semi-gears, a meshing state and a separated state can be formed with the toothed plate. In the meshing state, the semi-gear drives the impact plate to rise through the toothed plate. In the separated state, the impact plate forms a free fall, exerting an impact force on the top of the lower pull plate below, so that the lower pull plate exerts an instantaneous impact downward tensile force on the copper alloy raw material. Therefore, the device only needs to continuously rotate the semi-gear to enable the impact plate to continuously rise and fall, forming a cycle, achieving a tensile test of applying an instantaneous impact force to the copper alloy raw material in a cycle, and being able to maintain the consistency of the impact force during each fall in the cycle. The operation is simple and reliable, which is beneficial to improving the test accuracy and test efficiency.

[0025] 4. The present invention slidably arranges an upper insertion plate and a lower insertion plate in the inner cavity of the fixed frame. When the second motor rotates forward, the transmission gear can drive the upper insertion plate and the lower insertion plate to move synchronously and reversely in the horizontal direction, that is, the lower insertion plate inserts into the insertion channel of the impact block, and the upper insertion plate leaves the insertion channel of another impact block. When the second motor rotates reversely, the upper insertion plate will enter the insertion channel, and the lower insertion plate will leave the insertion channel. By alternately rotating the second motor forward and backward, multiple impact blocks will fall downward one by one, exerting an impact force on the top of the lower pull plate, achieving a tensile test of applying a gradually increasing instantaneous impact force to the copper alloy raw material. By the synchronous reverse movement of the upper insertion plate and the lower insertion plate, alternately inserting into the insertion channels of the impact blocks, it is beneficial to ensure that only one impact block falls each time, enabling each impact block to increase the impact force exerted on the top of the lower pull plate on the basis of the previous impact block, and avoiding the confusion of the test logic caused by multiple impact blocks falling simultaneously.

[0026] 5. The present invention rotatably arranges a movable plate in the groove on the side wall of the impact block, and uses a limiting block to limit the upper rotation limit of the movable plate, so that when the impact block is on the top of the upper insertion plate or the lower insertion plate, the fixed effect can be maintained through the movable plate, avoiding the active fall of the impact block. When the upper insertion plate and the lower insertion plate alternately insert into the insertion channels of the impact blocks, the movable plate can fall from the top of the upper insertion plate to the top of the lower insertion plate, and then fall from the top of the lower insertion plate below, forming a fall, that is, the impact block forms a fall. When all the impact blocks have completed the fall and need to be reset, as the impact block rises, the plug structure of the lower insertion plate will press on the top of the movable plate, driving the movable plate to rotate, enabling the impact block to continue to rise until the impact block enters above the lower insertion plate. The movable plate is rotated and reset under the elastic force of the arc spring, so that the movable plate is maintained above the lower insertion plate and supported by the lower insertion plate, thus ensuring smooth reset and the impact block will not be blocked by the upper insertion plate and the lower insertion plate during the rising process. Description of the Drawings

[0027] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 It is a schematic diagram of another viewing angle of the overall structure of the present invention.

[0029] Figure 3 It is a schematic diagram of the structure of the slow stretching component of the present invention.

[0030] Figure 4 It is a schematic diagram of the disassembled structure of the slow stretching component of the present invention.

[0031] Figure 5 It is a schematic diagram of the structure of the cyclic impact assembly of the present invention.

[0032] Figure 6 It is a schematic diagram of the impact plate and half gear structure of the present invention.

[0033] Figure 7 It is a schematic diagram of the structure of the step-by-step impact assembly of the present invention.

[0034] Figure 8 It is a schematic diagram of the disassembly structure of the step-by-step impact assembly of the present invention.

[0035] Figure 9 It is a schematic diagram of the structure of the upper plug board, the lower plug board and the fixing frame of the present invention.

[0036] Figure 10 It is a schematic diagram of the split structure of the upper plug board and the lower plug board of the present invention.

[0037] Figure 11 It is a schematic diagram of the structure of the impact block of the present invention.

[0038] Figure 12 It is a schematic diagram of the cutaway structure of the impact block of the present invention.

[0039] Figure 13 It is a schematic diagram of the internal cross-section structure of the step-by-step impact assembly of the present invention.

[0040] Description of the numbers in the figure:

[0041] 1. Base; 2. Fixed table; 3. Slow stretching assembly; 4. Impact stretching assembly; 5. Top plate;

[0042] 301, upper pull plate; 302, lower pull plate; 303, limit hole; 304, movable hole; 305, limit plate; 306, slide bar; 307, drive cover; 308, buffer pad;

[0043] 41. Cyclic impact assembly; 42. Step-by-step impact assembly;

[0044] 4101, wheel frame; 4102, rod frame; 4103, half gear; 4104, rotating rod; 4105, worm gear; 4106, worm; 4107, motor 1; 4108, bevel gear 1; 4109, bevel gear 2; 4110, impact plate; 4111, ejector pin; 4112, toothed plate; 4113, square hole

[0045] 4201, first gear; 4202, second gear; 4203, drive gear; 4204, motor 2; 4205, rotating column; 4206, bevel gear 3; 4207, support plate; 4208, fixed frame; 4209, impact block; 4210, upper insertion plate; 42101, plug; 42102, roller; 42103, baffle; 4211, lower insertion plate; 4212, transmission gear; 4213, bevel gear 4; 4214, movable plate; 4215, limit block; 4216, arc column; 4217, arc spring Detailed implementation method

[0046] Example 1, as Figures 1 to 13 shown, a copper alloy tensile test tooling for an elevator safety tong involved in the present invention includes a base 1, a fixed table 2 is arranged inside the base 1, a top plate 5 is arranged above the base 1, an impact tensile assembly 4 is arranged between the base 1 and the top plate 5, and a slow tensile assembly 3 is arranged between the fixed table 2 and the top plate 5

[0047] In the embodiment of the present invention, the slow tensile assembly 3 includes an upper pulling plate 301 and a lower pulling plate 302. A plurality of limit holes 303 and movable holes 304 are opened in the lower pulling plate 302 from top to bottom. A limit plate 305 fixedly connected to the top of the fixed table 2 is arranged in the limit hole 303. The limit plate 305 is used to limit the rising limit of the lower pulling plate 302

[0048] Further, the slow stretching component 3 further includes a plurality of slide rods 306 and a plurality of driving covers 307 arranged between the fixed platform 2 and the top plate 5; the lower pull plate 302 is movably arranged on the slide rods 306, the driving covers 307 are arranged in the moving holes 304 with a clearance, a hydraulic cylinder connected to the top of the fixed platform 2 is arranged inside the driving covers 307, and the output end of the hydraulic cylinder is connected to the bottom of the upper pull plate 301; two buffer pads 308 are detachably arranged on the top of the fixed platform 2, and the buffer pads 308 are plate-like structures made of rubber; an upper clamp is connected to the bottom of the upper pull plate 301, a lower clamp is connected to the top of the lower pull plate 302, the upper clamp and the lower clamp are arranged with a clearance along the same vertical axis, and both ends of the copper alloy raw material are clamped and fixed by the upper clamp and the lower clamp respectively; the limiting plate 305 is an L-shaped plate-like structure, the protruding structure at the top of the limiting plate 305 is arranged above the lower pull plate 302, and the lower pull plate 302 is movably matched with the limiting plate 305 through the limiting hole 303; by changing the structure of the existing tensile test tooling, the lower pull plate 302 is movably arranged on the slide rods 306, and a limiting plate 305 fixedly connected to the top of the fixed platform 2 is arranged in the limiting hole 303 of the lower pull plate 302. The limiting plate 305 is designed as an L-shaped plate-like structure, so that the protruding structure at the top of the limiting plate 305 is arranged above the lower pull plate 302. The limiting plate 305 can limit the rising limit of the lower pull plate 302, enabling the lower pull plate 302 to freely lift and lower within a limited height. When performing a tensile test operation of applying an instantaneous impact force to the copper alloy raw material, by adjusting the upward movement of the upper pull plate 301, after the top of the lower pull plate 302 is restricted from rising by the limiting plate 305, the upper pull plate 301 is adjusted to maintain at this height to form a static state. Then, the impact stretching component 4 applies a vertically downward impact force to the top of the lower pull plate 302. The lower pull plate 302 can transmit the impact force to the copper alloy raw material, generating a downward tensile force on the copper alloy raw material. If the copper alloy raw material breaks, the lower pull plate 302 can quickly descend and land on the buffer pads 308 to unload the impact force, which is beneficial to providing a better impact environment for the tensile test of the instantaneous impact force.

[0049] In an embodiment of the present invention, the impact stretching component 4 includes a cyclic impact component 41 arranged above the lower pull plate 302 and a step-by-step impact component 42 arranged above the cyclic impact component 41. The cyclic impact component 41 is used to cyclically apply an instantaneous impact force to the top of the lower pull plate 302 to perform a cyclic impact tensile test on the copper alloy raw material, and the step-by-step impact component 42 is used to apply a step-by-step increasing instantaneous impact force to the top of the lower pull plate 302 to perform a multi-step increasing impact tensile test on the copper alloy raw material.

[0050] In the present invention, a cyclic impact assembly 41 and a step-by-step impact assembly 42 are designed above the lower pull plate 302. By using the cyclic impact assembly 41 to apply an instantaneous impact force to the top of the lower pull plate 302 cyclically, and the step-by-step impact assembly 42 to apply a gradually increasing instantaneous impact force to the top of the lower pull plate 302, it is possible to test the response of the copper alloy raw material when suddenly applied with a tensile impact force, understand the ability of the copper alloy raw material to resist impact damage, simulate various stress and tensile states during the actual braking process when the copper alloy raw material is used in an elevator safety clamp, thereby improving the effectiveness and comprehensiveness of the tensile test, and solving the problem that it is difficult to simulate the impact situation that the copper alloy used in the safety clamp may encounter in actual use during the tensile test.

[0051] As another embodiment of the present invention, the top of the base 1 and the bottom of the top plate 5 are connected by a plurality of wheel frames 4101 and a plurality of rod frames 4102. Every two wheel frames 4101 form a group, and there are two groups of wheel frames 4101. The rod frames 4102 are arranged on the side of the wheel frames 4101;

[0052] Furthermore, the cyclic impact assembly 41 includes two half gears 4103, which are symmetrically arranged. The two half gears 4103 are respectively rotatably arranged on the side walls of the two groups of wheel frames 4101. The half gears 4103 are coaxially connected with worm wheels 4105. A rotating rod 4104 is rotatably arranged between the two rod frames 4102. Two worms 4106 with opposite thread directions are arranged on the circumferential outer wall of the rotating rod 4104. The worms 4106 are meshed and connected with the worm wheels 4105. A first motor 4107 is also arranged on the top of the base 1. The output end of the first motor 4107 is connected with a first bevel gear 4108. The first bevel gear 4108 is meshed and connected with a second bevel gear 4109. The side wall of the second bevel gear 4109 is connected with one end of the rotating rod 4104;

[0053] Furthermore, the cyclic impact assembly 41 further includes an impact plate 4110. A plurality of top columns 4111 are connected to the top of the impact plate 4110. A sliding rod 306 penetrates through the impact plate 4110 and the top columns 4111 from top to bottom. The impact plate 4110 is slidably matched with the sliding rod 306. A toothed plate 4112 is connected to one side wall of the impact plate 4110. The toothed plate 4112 is meshed and connected with the half gear 4103. A square hole 4113 is formed on the top surface of the impact plate 4110. A driving cover 307 is arranged in the square hole 4113. A planar structure is arranged on the circumferential outer wall of the half gear 4103, and the planar structure is used for the half gear 4103 and the toothed plate 4112 to form a separated state.

[0054] In the present invention, by designing two symmetrically arranged semi-gears 4103 and providing a planar structure on the circumferential outer wall of the semi-gears 4103, during the continuous rotation of the semi-gears 4103, an engaged state and a separated state can be formed with the toothed plate 4112. In the engaged state, the semi-gears 4103 drive the impact plate 4110 to rise through the toothed plate 4112. In the separated state, the impact plate 4110 forms a free fall, generating an impact force on the top of the lower pull plate 302 below, causing the lower pull plate 302 to apply an instantaneous impact downward tensile force to the copper alloy raw material. Thus, with only the continuous rotation of the semi-gears 4103, the impact plate 4110 can continuously rise and fall, forming a cycle, achieving a tensile test of applying an instantaneous impact force to the copper alloy raw material in a cycle, and being able to maintain the consistency of the impact force during each fall. The operation is simple and reliable, which is beneficial to improving the accuracy and efficiency of the test.

[0055] As another embodiment of the present invention, the step-by-step impact assembly 42 includes a first gear 4201, a second gear 4202, and a driving gear 4203 rotatably arranged on the top of the top plate 5. An equipment rack is further arranged on the top of the top plate 5, and a second motor 4204 is arranged on the top of the equipment rack. The output end of the second motor 4204 is connected to the driving gear 4203. The driving gear 4203 is meshed and connected with the first gear 4201, and the first gear 4201 is meshed and connected with the second gear 4202. Among them, the first gear 4201 forms a coaxial connection relationship with a third bevel gear 4206 through a rotating column 4205 that movably penetrates the bottom of the top plate 5. The second gear 4202 and the first gear 4201 are arranged with the same structural components. Two insertion and separation assemblies are arranged at the bottom of the top plate 5, and the two insertion and separation assemblies are arranged in a symmetric structure.

[0056] As another embodiment of the present invention, a plurality of impact blocks 4209 in a stacked state are arranged between two plugging and unplugging components. Sliding holes with the same structure are formed at the four corners of the impact block 4209. The impact block 4209 is slidably arranged on the slide bar 306 through the sliding holes. A hole with the same structure as the square hole 4113 is formed in the impact block 4209 from top to bottom; a first groove is formed in one side wall of the impact block 4209. A movable plate 4214 is rotatably arranged in the first groove. An insertion channel is formed below the movable plate 4214. A limiting block 4215 is integrally formed at the top of the first groove. The limiting block 4215 is arranged above the movable plate 4214. An arc-shaped column 4216 is connected to the inner side wall of the first groove. The arc-shaped column 4216 penetrates the side wall of the movable plate 4214 and is movably matched with the movable plate 4214. An arc-shaped spring 4217 is sleeved on the arc-shaped column 4216. The arc-shaped spring 4217 is arranged at the bottom of the movable plate 4214; a second groove is formed in the other side wall of the impact block 4209. The second groove is arranged symmetrically with the first groove. A structural component symmetrical to that in the first groove is arranged in the second groove; in the present invention, the movable plate 4214 is rotatably arranged in the groove on the side wall of the impact block 4209, and the limiting block 4215 is used to limit the upper rotation limit of the movable plate 4214, so that when the impact block 4209 is on the top of the upper plug plate 4210 or the lower plug plate 4211, a fixing effect can be maintained through the movable plate 4214, avoiding the situation of the impact block 4209 falling. When the upper plug plate 4210 and the lower plug plate 4211 are alternately inserted into the insertion channel of the impact block 4209, the movable plate 4214 can fall from the top of the upper plug plate 4210 to the top of the lower plug plate 4211, and then fall from the top of the lower plug plate 4211 to below the lower plug plate 4211 again, forming a fall, that is, the impact block 4209 forms a fall. When all the impact blocks 4209 have completed the fall and need to be reset, as the impact block 4209 rises, the plug structure of the lower plug plate 4211 will press on the top of the movable plate 4214, driving the movable plate 4214 to rotate, so that the impact block 4209 can continue to rise until the impact block 4209 enters above the lower plug plate 4211. The movable plate 4214 rotates and resets under the elastic force of the arc-shaped spring 4217, so that the movable plate 4214 is kept above the lower plug plate 4211 and is supported by the lower plug plate 4211, thus ensuring smooth reset, and the impact block 4209 will not be blocked by the upper plug plate 4210 and the lower plug plate 4211 during the rising process.

[0057] As another embodiment of the present invention, one of the insertion and separation components includes a plurality of support plates 4207 and a plurality of fixed frames 4208 connected to the bottom of the top plate 5. An upper insertion plate 4210 and a lower insertion plate 4211 are arranged in the inner cavity of the fixed frame 4208. The side walls of the upper insertion plate 4210 and the lower insertion plate 4211 are respectively provided with chutes of the same structure. A plurality of convex plate structures that fit with the chutes are connected to the side walls of the inner cavity of the fixed frame 4208. The upper insertion plate 4210 and the lower insertion plate 4211 are slidably matched with the inner cavity of the fixed frame 4208 through the chutes; a plurality of first tooth openings are provided at the bottom of the upper insertion plate 4210, and a plurality of second tooth openings are provided at the top of the lower insertion plate 4211. A transmission gear 4212 is arranged between the upper insertion plate 4210 and the lower insertion plate 4211. The transmission gear 4212 is respectively meshed and connected with the first tooth opening and the second tooth opening. The transmission gear 4212 is rotatably arranged between the two support plates 4207. The transmission gear 4212 is coaxially connected with a fourth bevel gear 4213, and the fourth bevel gear 4213 is meshed and connected with the third bevel gear 4206; the upper insertion plate 4210 includes a plug 42101. A plurality of roller columns 42102 are rotatably arranged at the top of the plug 42101. A baffle 42103 is connected to the side wall of the plug 42101. A bevel structure is provided at the bottom of the plug 42101. The lower insertion plate 4211 includes the same structure as the plug 42101.

[0058] In the present invention, the upper insertion plate 4210 and the lower insertion plate 4211 are slidably arranged in the inner cavity of the fixed frame 4208. When the second motor 4204 rotates forward, the transmission gear 4212 can drive the upper insertion plate 4210 and the lower insertion plate 4211 to move synchronously and reversely in the horizontal direction, that is, the lower insertion plate 4211 is inserted into the insertion channel of the impact block 4209, and the upper insertion plate 4210 leaves the insertion channel of another impact block 4209. When the second motor 4204 rotates reversely, the upper insertion plate 4210 will enter the insertion channel, and the lower insertion plate 4211 will leave the insertion channel. By alternately rotating the second motor 4204 forward and backward, a plurality of impact blocks 4209 will fall downward one by one, applying an impact force to the top of the lower pull plate 302, achieving a tensile test of applying a gradually increasing instantaneous impact force to the copper alloy raw material. By synchronously and reversely moving the upper insertion plate 4210 and the lower insertion plate 4211 to alternately insert into the insertion channels of the impact blocks 4209, it is beneficial to ensure that only one impact block 4209 falls each time, so that each impact block 4209 will increase the impact force applied to the top of the lower pull plate 302 on the basis of the previous impact block 4209, avoiding the logic of the test being confused due to multiple impact blocks 4209 falling simultaneously.

[0059] Embodiment 2. This embodiment provides a method for using a copper alloy tensile test tooling for an elevator safety clamp, including the following steps:

[0060] S1. Continuously apply a tensile force in a linear direction to the copper alloy raw material. When testing the mechanical property indexes of the copper alloy raw material under normal stress conditions, clamp and fix both ends of the copper alloy raw material through the upper clamp and the lower clamp respectively. At this time, the upper pull plate 301 and the lower pull plate 302 form a connection relationship through the copper alloy raw material. Push the upper pull plate 301 to move upward through the hydraulic cylinder inside the drive cover 307. The upper pull plate 301 drives the lower pull plate 302 to move upward through the copper alloy raw material until the upward movement of the top of the lower pull plate 302 is restricted by the limit plate 305. Continuously move the upper pull plate 301 upward to apply a continuous tensile force to the copper alloy raw material until the copper alloy raw material breaks, completing the tensile test.

[0061] S2. Conduct a tensile test operation on the copper alloy raw material by applying an instantaneous impact force. When it is necessary to simulate the tensile stress state of the copper alloy raw material during the actual braking process of an elevator safety clamp, first fix the copper alloy raw material between the upper pull plate 301 and the lower pull plate 302. By adjusting the upward movement of the upper pull plate 301, after the upward movement of the top of the lower pull plate 302 is restricted by the limit plate 305, adjust the upper pull plate 301 to maintain at this height to form a static state. Then, apply a vertically downward impact force to the top of the lower pull plate 302 through the impact tensile assembly 4 to drive the lower pull plate 302 to generate a downward tensile force on the copper alloy raw material, forming an impact-type tensile test.

[0062] S2.1. Conduct a tensile test operation on the copper alloy raw material by applying an instantaneous impact force in a cycle. Through the operation of the first motor 4107, drive the rotating rod 4104 to rotate. The rotating rod 4104 drives two worm wheels 4105 to rotate in opposite directions respectively through two worms 4106 with opposite thread directions, further driving two symmetrically distributed half gears 4103 to rotate in opposite directions until the planar structure of the half gear 4103 is separated from the toothed plate 4112. At this time, the toothed plate 4112 loses the supporting effect of the half gear 4103, causing the impact plate 4110 to fall vertically downward under the influence of its own gravity, forming an impact force on the top of the lower pull plate 302, so that the lower pull plate 302 applies an instantaneous impact tensile force to the copper alloy raw material. Through the continuous rotation of the half gear 4103 until the half gear 4103 and the toothed plate 4112 are re-engaged, the rotation of the half gear 4103 drives the toothed plate 4112 to rise, and then the impact plate 4110 rises and resets. The half gear 4103 continues to rotate until the planar structure of the half gear 4103 is separated from the toothed plate 4112 again, causing the impact plate 4110 to fall vertically downward again, forming an impact force on the top of the lower pull plate 302 again, forming a cycle until the copper alloy raw material breaks, completing the tensile test of applying an instantaneous impact force to the copper alloy raw material in a cycle.

[0063] S2.2. Tensile test operation of applying gradually increasing instantaneous impact force to the copper alloy raw material. Through the operation of S2.1, after the impact plate 4110 vertically drops onto the top of the lower pull plate 302, the rotation of the semi-gear 4103 is stopped, and the impact plate 4110 is kept in the state on the top of the lower pull plate 302. Then, the motor two 4204 drives the driving gear 4203 to rotate. The driving gear 4203 drives the first gear 4201 to rotate. The first gear 4201 drives the second gear 4202 to rotate synchronously and reversely. The first gear 4201 also drives the bevel gear three 4206 to rotate synchronously through the rotating column 4205. The bevel gear three 4206 drives the transmission gear 4212 to rotate through the bevel gear four 4213. The transmission gear 4212 drives the upper insertion plate 4210 and the lower insertion plate 4211 to move synchronously and reversely in the horizontal direction, that is, the lower insertion plate 4211 inserts into the insertion channel of the impact block 4209, and the upper insertion plate 4210 leaves the insertion channel of another impact block 4209. Similarly, the second gear 4202 drives another group of upper insertion plate 4210 and lower insertion plate 4211 to move synchronously and reversely in the horizontal direction. Moreover, the two lower insertion plates 4211 will simultaneously insert into the two insertion channels of the impact block 4209 respectively, and the other two upper insertion plates 4210 will respectively leave the insertion channels of another impact block 4209 simultaneously. When the motor two 4204 rotates reversely, the upper insertion plate 4210 will enter the insertion channel, and the lower insertion plate 4211 will leave the insertion channel. By alternately rotating the motor two 4204 forward and backward, multiple impact blocks 4209 will fall downward one by one, applying impact force to the top of the lower pull plate 302. Each impact block 4209 will increase the impact force applied to the top of the lower pull plate 302 on the basis of the previous impact block 4209, achieving a tensile test of applying gradually increasing instantaneous impact force to the copper alloy raw material until the copper alloy raw material breaks;

[0064] S3. Reset operation: After completing the tensile test operation on the copper alloy, relative to the inner cavity of the fixed frame 4208, adjust the lower insertion plate 4211 to the extended state and the upper insertion plate 4210 to the retracted state. Then, continue to rotate the half gear 4103 until the half gear 4103 and the toothed plate 4112 re-form a meshing relationship. The rotation of the half gear 4103 drives the toothed plate 4112 to rise, thereby causing the impact plate 4110 to rise. The impact plate 4110 pushes the multiple stacked impact blocks 4209 above it to rise through multiple ejector pins 4111. When the impact blocks 4209 rise below the lower insertion plate 4211 in the extended state, as the impact blocks 4209 continue to rise, the plug structure of the lower insertion plate 4211 presses on the top of the movable plate 4214, driving the movable plate 4214 to rotate, enabling the impact blocks 4209 to continue to rise until the impact blocks 4209 enter above the lower insertion plate 4211. The movable plate 4214 rotates and resets under the elastic force of the arc spring 4217, keeping the movable plate 4214 above the lower insertion plate 4211. When all the impact blocks 4209 enter above the lower insertion plate 4211, reverse-rotate the half gear 4103 to separate the ejector pins 4111 on the top of the impact plate 4110 from the impact blocks 4209. The impact blocks 4209 descend, and the bottom of the movable plate 4214 lands on the top of the plug structure of the lower insertion plate 4211, forming a supporting effect to complete the reset operation.

[0065] The embodiments disclosed in the present invention are preferred embodiments, but not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A copper alloy tensile test tool for elevator safety clamps, characterized in that: It comprises a base (1), a fixing platform (2) is arranged inside the base (1), a top plate (5) is arranged above the base (1), an impact stretching component (4) is arranged between the base (1) and the top plate (5), and a slow stretching component (3) is arranged between the fixing platform (2) and the top plate (5); The slow stretching assembly (3) comprises an upper pull plate (301) and a lower pull plate (302), the lower pull plate (302) being provided with a plurality of limit holes (303) and movable holes (304) from top to bottom, a limit plate (305) fixedly connected to the top of the fixed platform (2) being arranged in the limit hole (303), the limit plate (305) being used to limit the upward limit of the lower pull plate (302); The impact stretching assembly (4) comprises a cyclic impact assembly (41) and a step-by-step impact assembly (42) arranged above the pull-down plate (302), wherein the step-by-step impact assembly (42) is arranged above the cyclic impact assembly (41); The cyclic impact assembly (41) is used to cyclically apply instantaneous impact force to the top of the pull-down plate (302) to perform a cyclic impact tensile test on the copper alloy raw material, and the step-by-step impact assembly (42) is used to apply a step-by-step increasing instantaneous impact force to the top of the pull-down plate (302) to perform multiple incremental impact tensile tests on the copper alloy raw material; The cyclic impact assembly (41) comprises two half gears (4103) and an impact plate (4110), the two symmetrically distributed half gears (4103) rotate in opposite directions to each other, a plurality of top columns (4111) are connected to the top of the impact plate (4110), a tooth plate (4112) is connected to a side wall of the impact plate (4110), and the tooth plate (4112) is meshingly connected to the half gears (4103); a plane structure is provided on the circumferential outer wall of the half gear (4103), and the plane structure is used to form a separation state between the half gear (4103) and the tooth plate (4112); Two plug-in assemblies are arranged at the bottom of the top plate (5), and the two plug-in assemblies are arranged in a symmetrical structure. A plurality of impact blocks (4209) in a stacked state are arranged between the two plug-in assemblies; one of the plug-in assemblies comprises a plurality of support plates (4207) and a plurality of fixing frames (4208) connected to the bottom of the top plate (5), and an upper plug-in plate (4210) and a lower plug-in plate (4211) are arranged in an inner cavity of the fixing frame (4208); a plurality of tooth openings 1 are arranged at the bottom of the upper plug-in plate (4210), and a plurality of tooth openings 2 are arranged at the top of the lower plug-in plate (4211); a transmission gear (4212) is arranged between the upper plug-in plate (4210) and the lower plug-in plate (4211), and the transmission gear (4212) is meshedly connected with the tooth openings 1 and 2, respectively; a first groove is provided on one side wall of the impact block (4209); A movable plate (4214) is rotatably arranged in the first groove, a plug-in channel is formed below the movable plate (4214), a limiting block (4215) is integrally formed at the top of the first groove, and the limiting block (4215) is arranged above the movable plate (4214), an arc column (4216) is connected to the inner side wall of the first groove, the arc column (4216) passes through the side wall of the movable plate (4214) and movably cooperates with the movable plate (4214), an arc spring (4217) is sleeved on the arc column (4216), and the arc spring (4217) is arranged at the bottom of the movable plate (4214); the transmission gear (4212) drives the upper plug-in plate (4210) and the lower plug-in plate (4211) to move synchronously in opposite directions in the horizontal direction, forming an alternate insertion plug-in channel for the impact block (4209).

2. The copper alloy tensile test fixture for elevator safety clamps according to claim 1, characterized in that: The slow stretching assembly (3) further comprises a plurality of sliding rods (306) and a plurality of driving covers (307) arranged between the fixed platform (2) and the top plate (5); The pull-down plate (302) is movably arranged on the slide bar (306), the drive cover (307) is arranged in the movable hole (304), a hydraulic cylinder connected to the top of the fixed platform (2) is arranged inside the drive cover (307), and the output end of the hydraulic cylinder is connected to the bottom of the pull-up plate (301); Two buffer pads (308) are detachably arranged on the top of the fixing platform (2), and the buffer pads (308) are plate-shaped structures made of rubber material.

3. The copper alloy tensile test fixture for elevator safety clamps according to claim 2, characterized in that: The bottom of the upper pull plate (301) is connected to an upper clamp, and the top of the lower pull plate (302) is connected to a lower clamp, the upper clamp and the lower clamp are arranged with a gap along the same vertical axis, and the two ends of the copper alloy raw material are clamped and fixed by the upper clamp and the lower clamp respectively; The limiting plate (305) is an L-shaped plate structure, the protruding structure on the top of the limiting plate (305) is arranged above the pull-down plate (302), and the pull-down plate (302) is movably matched with the limiting plate (305) through the limiting hole (303).

4. The copper alloy tensile test fixture for elevator safety clamps according to claim 3, characterized in that: The top of the base (1) and the bottom of the top plate (5) are connected via a plurality of wheel frames (4101) and a plurality of rod frames (4102), each two of the wheel frames (4101) form a group, there are two groups of wheel frames (4101), and the rod frames (4102) are arranged on the sides of the wheel frames (4101); The two half gears (4103) are rotatably arranged on the side walls of the two sets of wheel frames (4101), and the half gears (4103) are coaxially connected to the worm gear (4105); A rotating rod (4104) is rotatably arranged between the two rod frames (4102), and two worms (4106) with opposite thread directions are arranged on the circumferential outer wall of the rotating rod (4104), and the worms (4106) are meshingly connected with the worm wheel (4105); A motor 1 (4107) is also arranged on the top of the base (1); the output end of the motor 1 (4107) is connected to a bevel gear 1 (4108); the bevel gear 1 (4108) is meshingly connected to a bevel gear 2 (4109); and the side wall of the bevel gear 2 (4109) is connected to one end of the rotating rod (4104).

5. The copper alloy tensile test fixture for elevator safety clamps according to claim 4, characterized in that: The impact plate (4110) and the top column (4111) are penetrated from top to bottom by the sliding rod (306), and the impact plate (4110) and the sliding rod (306) are slidably matched; A square hole (4113) is provided on the top surface of the impact plate (4110), and the drive cover (307) is arranged in the square hole (4113).

6. The copper alloy tensile test fixture for elevator safety clamps according to claim 5, characterized in that: The step-by-step impact assembly (42) comprises a first gear (4201), a second gear (4202) and a driving gear (4203) which are rotatably arranged on the top of the top plate (5); an equipment rack is also arranged on the top of the top plate (5); a second motor (4204) is arranged on the top of the equipment rack; an output end of the second motor (4204) is connected to the driving gear (4203); the driving gear (4203) is meshedly connected to the first gear (4201); and the first gear (4201) is meshedly connected to the second gear (4202); The first gear (4201) is coaxially connected with the bevel gear three (4206) via a rotating column (4205) that movably passes through the bottom of the top plate (5), and the second gear (4202) and the first gear (4201) are arranged with the same structural components.

7. The copper alloy tensile test fixture for elevator safety clamps according to claim 6, characterized in that: The side walls of the upper plug plate (4210) and the side walls of the lower plug plate (4211) are respectively provided with sliding grooves of the same structure, and the side walls of the inner cavity of the fixed frame (4208) are connected with a plurality of convex plate structures that match the sliding grooves. The upper plug plate (4210) and the lower plug plate (4211) are slidably matched with the inner cavity of the fixed frame (4208) through the sliding grooves.

8. The copper alloy tensile test fixture for elevator safety clamps according to claim 7, characterized in that: The transmission gear (4212) is rotatably arranged between the two support plates (4207), and the transmission gear (4212) is coaxially connected with a bevel gear four (4213), and the bevel gear four (4213) is meshingly connected with the bevel gear three (4206).

9. The copper alloy tensile test fixture for elevator safety clamps according to claim 8, characterized in that: The upper plug plate (4210) comprises a plug (42101), a plurality of rollers (42102) are rotatably arranged on the top of the plug (42101), a baffle (42103) is connected to the side wall of the plug (42101), an inclined surface structure is arranged at the bottom of the plug (42101), and the lower plug plate (4211) comprises the same structure as the plug (42101).

10. The copper alloy tensile test fixture for elevator safety clamps according to claim 9, characterized in that: The impact block (4209) has sliding holes with the same structure at the four corners, and the impact block (4209) is slidably arranged on the sliding rod (306) through the sliding holes. The impact block (4209) has holes with the same structure as the square hole (4113) from top to bottom; A second groove is formed on the other side wall of the impact block (4209), and the second groove is arranged in a symmetrical structure with the first groove. A structural component symmetrical to that in the first groove is arranged in the second groove.

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