Part conveying device with screening function for machining

Abstract

The part conveying device with the screening function for machining relates to the technical field of logistics and supply chain management and comprises a supporting frame, a groove is formed in the surface of the supporting frame, a rotating motor is arranged on the right side of the supporting frame, and a supporting plate is fixedly mounted at the top of the supporting frame; a sliding groove is formed in the surface of the supporting plate, a conveying belt is fixedly installed on the inner wall of the supporting frame, a rolling shaft is arranged in the conveying belt and rotationally penetrates through the supporting frame, a feeding port is formed in the upper portion of the supporting frame, a sliding groove is formed in the surface of the feeding port, and a discharging port is fixedly installed on the rear side of the supporting frame. Parts slide to the position above the speed brake under the action of the gravity of the inclined face of the feeding port, the parts touch the speed brake to enable the speed brake to descend, and when the speed brake descends, the parts touch arc-shaped rubber arranged on the surface of the speed brake, so that the buffering effect is achieved, and the follow-up part screening efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of logistics and supply chain management, and in particular to a parts transportation device with a screening function for mechanical processing. Background Art

[0002] Conveyor systems, air cushion conveying systems, vacuum conveying systems, robotic and automation systems, conveying pipeline systems, these technologies and equipment are usually selected and applied according to specific production needs and part characteristics to achieve safe, efficient and reliable parts transportation.

[0003] The patent with patent announcement number CN207876883U discloses a mechanical processing parts conveying system, including a conveyor belt and a feeding bin located above the conveyor belt; a parts outlet is provided on the front side of the feeding bin, and a curtain is provided at the parts outlet; the curtain is arranged obliquely, and the lower part of the curtain points into the feeding bin; the curtain includes a fixed strip portion and a curtain portion fixedly arranged at the lower part of the fixed strip portion, and the curtain portion is composed of a plurality of hard rubber strips. The oblique curtain can effectively reduce the overflow of dust from the feeding bin.

[0004] In the above patent, the dust contamination of screws and nuts during pouring onto the conveyor belt is avoided, but the current measuring equipment has the following problems: when a large number of parts are input into the feed port, they will accumulate at the feed port and cause blockage of the feed port, thereby affecting subsequent transportation. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a parts transport device with a screening function for mechanical processing, which solves the problems raised in the above-mentioned background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a parts transportation device with screening function for mechanical processing, comprising a support frame, a groove is provided on the surface of the support frame, a rotating motor is arranged on the right side of the support frame, a support plate is fixedly installed on the top of the support frame, a slide groove is provided on the surface of the support plate, a conveyor belt is fixedly installed on the inner wall of the support frame, a roller is provided inside the conveyor belt, the roller rotates and penetrates the support frame, a feed port is provided above the support frame, a slide groove is provided on the surface of the feed port, a discharge port is fixedly installed on the rear side of the support frame, and a feed device, a screening device and a pushing device are provided on the surface of the support frame; Among them, the feeding device includes a slider A, a separator plate, a rotating shaft, a shift block gear, a slider B, a speed reducer and a support block. The slider A is fixedly installed at the bottom of the feeding port, the separator plate is slidably installed on the right side of the slider A, the separator plate slides through the feeding port, the rotating shaft slides through the support block, the rotating shaft is connected to the roller transmission through a belt, the shift block gear is fixedly installed on the surface of the rotating shaft, and the rotation of the shift block gear will continuously contact the inclined surface opened at the bottom of the separator plate, so that the separator plate moves back and forth up and down, the slider B is fixedly installed in the groove opened in the feeding port, the speed reducer is slidably installed on the rear side of the slider B, and the support block is fixedly installed on the top of the support frame.

[0007] According to the above technical solution, a material dividing plate is arranged at the center of the conveyor belt, a No. 1 torsion spring is arranged between the A slider and the material dividing plate, a No. 2 torsion spring is arranged between the B slider and the speed reducer, and a rubber block is arranged on the surface of the speed reducer. When the speed reducer moves downward, the parts will touch the arc-shaped rubber on its surface, thereby achieving a short-term buffering effect, and the parts will then fall into the subsequent screening device due to the gravity of the inclined plane.

[0008] According to the above technical solution, the bottom of the separator plate is set as an inclined surface, the diameter of the rotating shaft is twice the diameter of the roller, the surface of the shift block gear close to the bottom of the separator plate is set as an arc shape, and the roller drives the rotating shaft to rotate through a belt. The rotating shaft diameter is set to be smaller than the diameter of the conveyor belt rotating shaft, so that the rotating shaft rotation speed is slower than the conveyor belt rotation speed.

[0009] According to the above technical scheme, the screening device includes a rotating knob, a shaking rod, a connecting rod, a sieve plate A, a baffle, a sieve plate B, a fixed block and a connecting block. The rotating knob is fixedly installed on the right side of the rotating shaft, the shaking rod is rotatably installed on the surface of the rotating knob away from the rotating shaft, the connecting rod is fixedly installed on the surface of the shaking rod close to the A sieve plate, the A sieve plate is fixedly installed on the surface of the connecting rod away from the shaking rod, the connecting rod slides through the support plate, the baffle is fixedly installed on the top of the A sieve plate, the B sieve plate is fixedly installed on the bottom of the A sieve plate, the fixed block is fixedly installed on the top of the support frame, the connecting block is fixedly installed on the right side of the A sieve plate, and the connecting block slides through the support plate.

[0010] According to the above technical solution, a leakage groove is opened on the surface of the A sieve plate, and a No. 1 spring piece is arranged between the fixed block and the connecting block. The leakage groove opened in the A sieve plate allows some parts of different sizes to fall into the B sieve plate below.

[0011] According to the above technical solution, a rubber block is provided on the side of the A screen plate close to the conveyor belt, and a rubber block is provided on the side of the B screen plate close to the conveyor belt. The unscreened parts will slide down to the outlet of the A screen plate through shaking and the gravity of the inclined surface, and then fall onto the conveyor belt under the deceleration of the rubber block opened at the outlet of the A screen plate. The screened parts will flow out from the B screen plate, and then fall onto the conveyor belt under the deceleration of the rubber block opened at the outlet of the B screen plate.

[0012] According to the above technical solution, the pushing device includes a push rod, a C slider, a push block, a push plate, a shock-absorbing column, an arc plate and a blocking plate. The push rod is fixedly installed on the surface of the connecting rod, the C slider is fixedly installed in a groove opened in the support frame, the push block is slidably installed on the surface of the C slider, the push plate is fixedly installed on the left side of the push block, the shock-absorbing column is fixedly installed on the left side of the push plate, the arc plate is fixedly installed on the left side of the shock-absorbing column, and the blocking plate is fixedly installed on the surface of the arc plate close to the support frame.

[0013] According to the above technical solution, a slope is formed on one side of the push block away from the push plate, a No. 3 torsion spring is arranged between the C slider and the push block, a No. 1 spring is arranged on the surface of the shock absorber column, and the push rod is driven to move back and forth by the reciprocating movement of the connecting rod. The reciprocating movement of the push rod will continuously contact the slope formed on the push block, causing the push block to move toward the center of the conveyor belt.

[0014] The present invention provides a parts transport device with a screening function for mechanical processing, which has the following beneficial effects: (1) In the present invention, through the setting of the feeding device, the roller drives the rotating shaft to rotate, and the rotation of the rotating shaft cooperates with the shifting block gear to continuously touch the inclined surface opened at the bottom of the partition plate, so that the partition plate continuously slides up and down on the A slider, thereby making the partition plate reciprocate up and down to block the input quantity of incoming materials, thereby improving the quality of subsequent conveying of parts. The parts slide to the top of the deceleration plate under the action of gravity of the inclined surface of the feeding port, and the parts touch the deceleration plate to make the deceleration plate descend. When the deceleration plate descends, the parts will touch the arc-shaped rubber opened on the surface of the deceleration plate, thereby achieving a buffering effect and improving the efficiency of subsequent screening of parts.

[0015] (2) The present invention, through the setting of the screening device, allows parts of different sizes to be screened through the leakage grooves opened on the A screen plate. Parts with too small sizes will fall into the lower B screen plate through the leakage grooves opened on the A screen plate, and then the parts will be diverted and output through the dividing plate opened in the center of the conveyor belt. The A screen plate is continuously shaken by rotating the rotating knob in coordination with the shaking rod, connecting rod, fixed block and connecting block, so that the parts on the A screen plate are screened more effectively, and at the same time, the parts are prevented from being stuck in the leakage grooves opened on the A screen plate, thereby improving the screening efficiency of the parts.

[0016] (3) The present invention, through the setting of the discharge device, drives the push rod to move back and forth through the movement of the shaking rod and the connecting rod, so that the push rod continuously touches the inclined surface provided on the push block, so that the push block moves toward the center of the conveyor belt, and the movement of the push block drives the push plate to move toward the center of the conveyor belt. The movement of the push plate drives the arc plate to move toward the center of the conveyor belt, and the movement of the arc plate drives the blocking plate to move toward the center of the conveyor belt, so as to push the parts on both sides to the middle. The blocking plate is used to block the parts to prevent the parts from entering the leakage groove provided on the support frame, causing the discharge device to be stuck by the parts. The spring provided on the shock-absorbing column can achieve a buffering effect when the arc plate pushes the parts to prevent the parts from being pushed away. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of a partial cross-sectional structure of a feeding device of the present invention; Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure in the middle; Figure 4 For the present invention Figure 2 A magnified schematic diagram of structure B in the middle; Figure 5 It is a partial cross-sectional structural schematic diagram of the screening device of the present invention; Figure 6 For the present invention Figure 5 A magnified schematic diagram of the C structure; Figure 7 It is a schematic diagram of a partial cross-section supplementary structure of the screening device of the present invention; Figure 8 It is a schematic diagram of a partial cross-sectional structure of a discharging device of the present invention; Fig. 9 For the present invention Figure 8 A magnified schematic diagram of the D structure.

[0018] In the figure: 1, support frame; 101, support plate; 2, conveyor belt; 3, feed port; 301, slider A; 302, partition plate; 303, rotating shaft; 304, shift block gear; 305, slider B; 306, speed reducer; 307, support block; 4, discharge port; 401, rotating knob; 4011, shaking rod; 4012, connecting rod; 402, sieve plate A; 4021, baffle; 403, sieve plate B; 404, fixing block; 405, connecting block; 501, push rod; 502, slider C; 503, push block; 504, push plate; 505, shock absorbing column; 506, arc plate; 507, barrier plate. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] See also Figure 1-4 One embodiment of the present invention is: a parts transport device with screening function for mechanical processing, comprising a support frame 1, a groove is provided on the surface of the support frame 1, a support plate 101 is fixedly installed on the top of the support frame 1, a slide groove is provided on the surface of the support plate 101, a conveyor belt 2 is fixedly installed on the inner wall of the support frame 1, a roller is provided inside the conveyor belt 2, the roller rotates and penetrates the support frame 1, a feed port 3 is provided above the support frame 1, a slide groove is provided on the surface of the feed port 3, a discharge port 4 is fixedly installed on the rear side of the support frame 1, and a feed device, a screening device and a push device are provided on the surface of the support frame 1; Among them, the feeding device includes an A slider 301, a separator plate 302, a rotating shaft 303, a shifting block gear 304, a B slider 305, a speed reducer 306 and a support block 307. The A slider 301 is fixedly installed at the bottom of the feed port 3, the separator plate 302 is slidably installed on the right side of the A slider 301, the separator plate 302 slides through the feed port 3, the rotating shaft 303 slides through the support block 307, the rotating shaft 303 is connected to the roller transmission through a belt, the shifting block gear 304 is fixedly installed on the surface of the rotating shaft 303, the B slider 305 is fixedly installed in the groove opened in the feed port 3, the speed reducer 306 is slidably installed on the rear side of the B slider 305, and the support block 307 is fixedly installed on the top of the support frame 1.

[0021] A material dividing plate is arranged at the center of the conveyor belt 2, a No. 1 torsion spring is arranged between the A slider 301 and the material dividing plate 302, a No. 2 torsion spring is arranged between the B slider 305 and the deceleration plate 306, and a rubber block is arranged on the surface of the deceleration plate 306. The material dividing plate 302 is reset by the setting of the No. 1 torsion spring, and the deceleration plate 306 is reset by the setting of the No. 2 torsion spring, and the function of the deceleration part is achieved by the setting of the rubber block.

[0022] The bottom of the separator plate 302 is set as an inclined surface, the diameter of the rotating shaft 303 is twice the diameter of the roller, and the surface of the shifting block gear 304 close to the bottom of the separator plate 302 is set as an arc shape. The set inclined surface allows the separator plate 302 to be better contacted, the set diameter size allows the rotating shaft 303 to rotate slowly, and the set arc shape allows the shifting block gear 304 to be better contacted.

[0023] When this embodiment is working: the conveyor belt 2 will drive the roller to rotate when working, and the rotation of the roller will drive the rotating shaft 303 to rotate through the belt. The diameter of the rotating shaft 303 is set to be larger than the diameter of the roller, so that the rotation speed of the rotating shaft 303 is slower than the rotation speed of the conveyor belt 2, and the rotation of the rotating shaft 303 will drive the shifting block gear 304 to rotate. The rotation of the shifting block gear 304 will continuously contact the inclined surface opened at the bottom of the partition plate 302, so that the partition plate 302 moves back and forth up and down, and the up and down reciprocating movement of the partition plate 302 will extend from the slide groove opened in the feed port 3, thereby indirectly blocking the inflow of parts, and then the parts slide to the top of the deceleration plate 306 through the action of gravity of the inclined surface of the feed port 3, and the force of the parts moving downward hits the deceleration plate 306, causing the deceleration plate 306 to move downward, and when the deceleration plate 306 moves downward, the parts will touch the arc-shaped rubber opened on its surface, thereby achieving a short-term buffering effect, and the parts will fall into the subsequent screening device with the gravity of the inclined surface.

[0024] See also Figure 1-7 On the basis of the above embodiment, in another embodiment of the present invention, the screening device includes a rotating knob 401, a shaking rod 4011, a connecting rod 4012, a screen plate A 402, a baffle 4021, a screen plate B 403, a fixing block 404 and a connecting block 405, the rotating knob 401 is fixedly mounted on the right side of the rotating shaft 303, the shaking rod 4011 is rotatably mounted on the surface of the rotating knob 401 away from the rotating shaft 303, and the connecting rod 4012 is fixedly mounted on the shaking rod 4011 near the A screen plate 402, the baffle 4021, the screen plate B 403, the fixing block 404 and the connecting block 405. The surface of one side of the sieve plate 402, the surface of the connecting rod 4012 on the side of the A sieve plate 402 away from the shaking rod 4011, the connecting rod 4012 slides through the support plate 101, the baffle 4021 is fixedly installed on the top of the A sieve plate 402, the B sieve plate 403 is fixedly installed on the bottom of the A sieve plate 402, the fixed block 404 is fixedly installed on the top of the support frame 1, and the connecting block 405 is fixedly installed on the right side of the A sieve plate 402, and the connecting block 405 slides through the support plate 101.

[0025] A leakage groove is provided on the surface of the A sieve plate 402, and a No. 1 spring piece is provided between the fixed block 404 and the connecting block 405. The leakage groove allows the parts to be better screened by the A sieve plate 402, and the setting of the No. 1 spring piece prevents the connecting block 405 from excessive movement.

[0026] A rubber block is provided on the side of the A sieve plate 402 close to the conveyor belt 2, and a rubber block is provided on the side of the B sieve plate 403 close to the conveyor belt 2. The rubber block allows the parts in the A sieve plate 402 to slowly fall onto the conveyor belt 2, and the rubber block allows the parts in the B sieve plate 403 to slowly fall onto the conveyor belt 2. When the present embodiment is working, the parts fall into the A sieve plate 402 by gravity of the inclined plane, and the leakage groove provided in the A sieve plate 402 allows some parts of different sizes to fall into the B sieve plate 403 below. The rotation of the rotating shaft 303 drives the rotating knob 401 to rotate, and the rotation of the rotating knob 401 drives the shaking rod 4011 to move back and forth, and the back and forth movement of the shaking rod 4011 drives the connecting rod 4012 to move back and forth, and the back and forth movement of the connecting rod 4012 drives the A sieve plate 402 to move back and forth, and the back and forth movement of the A sieve plate 402 drives the connecting block 405 to move, and the movement of the connecting block 405 drives the fixed block 404 and the connecting block 40 5 moves, and at this time, the fixed block 404 reaches a limiting role to prevent the spring piece from excessive bending. The reciprocating movement of the A sieve plate 402 back and forth will shake the parts on the surface of the A sieve plate 402, so that the parts on the surface of the A sieve plate 402 can fall from the leakage groove opened in the A sieve plate 402 more efficiently under the action of shaking, and then the unscreened parts will slide to the outlet of the A sieve plate 402 through the shaking and the gravity of the inclined surface, and then fall onto the conveyor belt 2 through the deceleration of the rubber block opened at the outlet of the A sieve plate 402, and the screened parts will flow out from the B sieve plate 403, and then fall onto the conveyor belt 2 through the deceleration of the rubber block opened at the outlet of the B sieve plate 403.

[0027] See also Figure 1-9 On the basis of the above-mentioned embodiment, in another embodiment of the present invention, the pushing device includes a push rod 501, a C slider 502, a push block 503, a push plate 504, a shock absorbing column 505, an arc plate 506 and a blocking plate 507. The push rod 501 is fixedly installed on the surface of the connecting rod 4012, the C slider 502 is fixedly installed in a groove provided in the support frame 1, the push block 503 is slidably installed on the surface of the C slider 502, the push plate 504 is fixedly installed on the left side of the push block 503, the shock absorbing column 505 is fixedly installed on the left side of the push plate 504, the arc plate 506 is fixedly installed on the left side of the shock absorbing column 505, and the blocking plate 507 is fixedly installed on the surface of the arc plate 506 close to the support frame 1.

[0028] The side of the push block 503 away from the push plate 504 is provided with an inclined surface, a No. 3 torsion spring is arranged between the C slider 502 and the push block 503, and a No. 1 spring is arranged on the surface of the shock absorbing column 505. The push block 503 is better contacted through the opened inclined surface, and the push block 503 is reset by the No. 3 torsion spring, and is buffered when contacting the shock absorbing column 505 by the No. 1 spring.

[0029] When the embodiment is working, the push rod 501 is driven to move back and forth by the reciprocating movement of the connecting rod 4012. The reciprocating movement of the push rod 501 will continuously contact the inclined surface of the push block 503, so that the push block 503 moves toward the center of the conveyor belt 2. When the push block 503 moves toward the center of the conveyor belt 2, it will drive the push plate 504 to move toward the center of the conveyor belt 2. When the push plate 504 moves toward the center of the conveyor belt 2, it will drive the shock-absorbing column 505 to move toward the center of the conveyor belt 2. The shock-absorbing column 505 moves toward the center of the conveyor belt 2. When the center moves, it will drive the arc plate 506 to move toward the center of the conveyor belt 2, thereby pushing the parts on both sides to the center of the conveyor belt 2. At the same time, the spring arranged on the surface of the shock-absorbing column 505 will buffer the force of the arc plate 506 to push the material, preventing the parts from being pushed away by the arc plate 506. When the arc plate 506 moves toward the center of the conveyor belt 2, it will drive the blocking plate 507 to move toward the center of the conveyor belt 2, thereby blocking the parts from entering the discharging device and preventing the parts from entering the discharging device and causing the discharging device to get stuck.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A parts transport device with a screening function for machining, comprising a support frame (1), characterized in that: The surface of the support frame (1) is provided with a groove, a support plate (101) is fixedly mounted on the top of the support frame (1), a slide groove is provided on the surface of the support plate (101), a conveyor belt (2) is slidably mounted on the inner wall of the support frame (1), a roller is provided inside the conveyor belt (2), the roller rotates and penetrates the support frame (1), a feed port (3) is provided above the support frame (1), a slide groove is provided on the surface of the feed port (3), a discharge port (4) is fixedly mounted on the rear side of the support frame (1), and a feed device, a screening device and a push device are provided on the surface of the support frame (1); The feeding device comprises an A slider (301), a material separator plate (302), a rotating shaft (303), a shifting block gear (304), a B slider (305), a deceleration plate (306) and a support block (307); the A slider (301) is fixedly mounted at the bottom of the feeding port (3); the material separator plate (302) is slidably mounted on the right side of the A slider (301); the material separator plate (302) slides through the feeding port (3); the rotating shaft (303) slides through the support block (307); the rotating shaft (303) is connected to a roller transmission via a belt; the shifting block gear (304) is fixedly mounted on the surface of the rotating shaft (303); the B slider (305) is fixedly mounted in a groove provided in the feeding port (3); the deceleration plate (306) is slidably mounted on the rear side of the B slider (305); and the support block (307) is fixedly mounted on the top of the support frame (1).

2. A parts transport device with screening function for machining according to claim 1, characterized in that: A material separator plate is arranged at the center of the conveyor belt (2), a first torsion spring is arranged between the A slider (301) and the material separator plate (302), a second torsion spring is arranged between the B slider (305) and the deceleration plate (306), and a rubber block is arranged on the surface of the deceleration plate (306).

3. A parts transport device with screening function for machining according to claim 2, characterized in that: The bottom of the material separator (302) is configured as an inclined surface, the diameter of the rotating shaft (303) is twice the diameter of the roller, and the surface of the shifting gear (304) close to the bottom of the material separator (302) is configured as an arc shape.

4. The parts transport device with screening function for machining according to claim 3 is characterized in that: The screening device comprises a rotating knob (401), a shaking rod (4011), a connecting rod (4012), a screen plate A (402), a baffle (4021), a screen plate B (403), a fixing block (404) and a connecting block (405); the rotating knob (401) is fixedly mounted on the right side of the rotating shaft (303); the shaking rod (4011) is rotatably mounted on a surface of the rotating knob (401) away from the rotating shaft (303); the connecting rod (4012) is fixedly mounted on a surface of the shaking rod (4011) close to the screen plate A (402); The A sieve plate (402) is fixedly mounted on a surface of a connecting rod (4012) away from a side of the shaking rod (4011), and the connecting rod (4012) slides through the support plate (101); the baffle plate (4021) is fixedly mounted on the top of the A sieve plate (402); the B sieve plate (403) is fixedly mounted on the bottom of the A sieve plate (402); the fixed block (404) is fixedly mounted on the top of the support frame (1); and the connecting block (405) is fixedly mounted on the right side of the A sieve plate (402); and the connecting block (405) slides through the support plate (101).

5. A parts transport device with screening function for machining according to claim 4, characterized in that: A leakage groove is provided on the surface of the A sieve plate (402), and a first spring piece is provided between the fixing block (404) and the connecting block (405).

6. A parts transport device with screening function for machining according to claim 5, characterized in that: A rubber block is provided on the side of the A screen plate (402) close to the conveyor belt (2), and a rubber block is provided on the side of the B screen plate (403) close to the conveyor belt (2).

7. A parts transport device with screening function for machining according to claim 6, characterized in that: The pushing device comprises a pushing rod (501), a C slider (502), a pushing block (503), a pushing plate (504), a shock absorbing column (505), an arc plate (506) and a blocking plate (507), wherein the pushing rod (501) is fixedly mounted on the surface of the connecting rod (4012), the C slider (502) is fixedly mounted in a groove provided in the support frame (1), the pushing block (503) is slidably mounted on the surface of the C slider (502), the pushing plate (504) is fixedly mounted on the left side of the pushing block (503), the shock absorbing column (505) is fixedly mounted on the left side of the pushing plate (504), the arc plate (506) is fixedly mounted on the left side of the shock absorbing column (505), and the blocking plate (507) is fixedly mounted on the surface of the arc plate (506) close to the support frame (1).

8. The parts transport device with screening function for machining according to claim 7, characterized in that: A side of the push block (503) away from the push plate (504) is provided with an inclined surface, a No. 3 torsion spring is provided between the C sliding block (502) and the push block (503), and a No. 1 spring is provided on the surface of the shock absorbing column (505).

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