Mobile phone nut mechanical picking assembly

Abstract

The invention relates to the technical field of nut picking, and discloses a mobile phone nut mechanical picking assembly which comprises a machine cabinet, a support is installed on the top in the machine cabinet, a collecting camera is installed on the support, a movable picker is arranged in the machine cabinet, a material receiving disc is arranged below the picker, and the mobile phone nut mechanical picking assembly further comprises a funnel used for feeding. The funnel is arranged on the inner wall of the cabinet in a sliding manner; the material receiving disc is movably arranged in the machine cabinet, in the moving process of the picker, the hopper can be driven by the traction assembly to ascend and descend in a reciprocating mode, and in the moving process of the picker, the material receiving disc can be driven by the traction assembly to move in a reciprocating mode in the horizontal direction. According to the device, the traction assembly is arranged, the supporting shaft and the traction rope wound on the supporting shaft are sequentially arranged, the traction rope is used for driving the first eccentric wheel and the second eccentric wheel correspondingly, so that the funnel is driven to vertically ascend and descend in a reciprocating mode, meanwhile, the material receiving disc is driven to shake by a certain amplitude in an inclined state, and the requirement for smooth falling of nuts is met.

Description

Technical Field

[0001] The invention relates to the technical field of nut picking, in particular to a mobile phone nut mechanical picking component. Background Art

[0002] Component designs in the electronics manufacturing industry are becoming increasingly sophisticated and microscopic, with complex and irregular shapes. Ultra-precision machining processes significantly increase the production cost of individual components, while also imposing stringent requirements for component appearance. The tight tolerances of product assembly complicate the handling of nuts. The current nut extraction mechanism's handling stability is insufficient for on-site production conditions. Upon removal from the workpiece after assembly, the nut can easily lift off the workpiece, requiring reassembly and significantly reducing assembly efficiency.

[0003] The publication number is "CN111168360A". A nut picking jig and a nut assembly method, the nut picking jig includes an adsorption sleeve, a push pin and a moving mechanism, the adsorption sleeve has an adsorption through-hole and a first air extraction hole, the first air extraction hole is connected to the adsorption through-hole; the push pin is movably arranged in the adsorption through-hole, and has a connecting end and an adsorption end; the moving mechanism is connected to the connecting end of the push pin, and drives the push pin to move in the adsorption through-hole. The nut picking jig of the present application adsorbs the nut to be assembled by the push pin, and then moves the nut picking jig to the nut assembly station, and the nut adsorbed by the push pin is placed on the nut assembly station, and finally the moving mechanism pushes the push pin, and the push pin pushes the nut into the nut assembly station. The push pin is driven to move in the adsorption through-hole by the moving mechanism, and when the nut is assembled on the workpiece, the push pin pushes the nut into the workpiece in a patting manner, ensuring that the nut is firmly fixed on the workpiece, effectively improving the assembly efficiency.

[0004] However, the existing technology and the above technology still have the following defects:

[0005] Most of the chassis are designed with hoppers and trays for feeding. When the equipment is not shut down, the equipment safety door does not need to be opened to realize manual online replenishment of nut hoppers. However, due to the small size and light weight of some nuts, incomplete blanking may occur during the feeding process, and it may also cause obstruction to the nuts entering later. Summary of the Invention

[0006] The present invention provides a mechanical picking assembly for mobile phone nuts, which solves the problem mentioned in the above background technology that most chassis are designed with hoppers and trays for feeding. When the equipment does not stop, the equipment safety door does not need to be opened to realize manual online replenishment of the nut hopper. However, since some nuts are small in size and light in weight, incomplete blanking may easily occur during the feeding process, and the nuts entering later may also be blocked.

[0007] The present invention provides the following technical solution: a mechanical picking assembly for mobile phone nuts, comprising a cabinet, a bracket installed on the top of the cabinet, a collection camera installed on the bracket, a movable picker provided in the cabinet, a receiving tray provided below the picker, and a funnel for feeding materials, the funnel being slidably arranged on the inner wall of the cabinet, and the receiving tray being arranged below the funnel; the receiving tray being movably arranged in the cabinet, and the funnel can be driven to lift and lower back and forth by the traction assembly during the movement of the picker, and the receiving tray can be driven to lift and lower back and forth in the horizontal direction by the traction assembly during the movement of the picker.

[0008] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, two groups of vertically arranged mobile racks are respectively arranged in the cabinet, one side of one group of the mobile racks is connected to a vertical rack, the picker is installed on one side of the vertical rack, and the other group of the mobile racks is installed on one side of the above-mentioned mobile racks.

[0009] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, wherein: a movable plate is connected to one side of the funnel, two sets of tracks are symmetrically installed on one side of the inner wall of the cabinet, the movable plate is slidably connected between the two sets of tracks, a guide rod is connected to the top of the movable plate, a positioning plate is provided on one side of the inner wall of the cabinet, one end of the guide rod is slidably connected to the positioning plate, a spring is connected between the positioning plate and the movable plate, and the spring is sleeved on the outside of the guide rod.

[0010] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, the traction assembly includes a support shaft rotatably mounted on the inner wall of the cabinet, a traction rope is keyed to the surface of the support shaft, one end of the traction rope is wound around the surface of the shaft sleeve, and the other end of the traction rope is fixedly connected to one side of the stand.

[0011] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, wherein: the surface of the support shaft is located below the movable plate and a first eccentric wheel is fixedly installed, an extension plate is installed at the bottom of the movable plate, the bottom surface of the extension plate is connected to a push rod, the bottom end of the push rod is provided with a ball head, and the first eccentric wheel is provided with a limiting groove matching the ball head.

[0012] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, wherein: bearing seats are provided at both ends of the support shaft, the bearing seats are fixedly installed on the inner wall of the cabinet, and torsion springs are provided at both ends of the bearing seats and the support shaft.

[0013] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, wherein: two groups of supports are arranged in the cabinet below the receiving tray, the supports are pin-connected to the receiving tray, the receiving tray is arranged at an angle, and two groups of connecting blocks are symmetrically arranged on the bottom surface of the receiving tray, the supports are connected to double-ear supports, and the connecting blocks are pin-connected to the double-ear supports.

[0014] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, one group of the supports is provided with two groups of second eccentric wheels on one side, an annular groove is opened in the second eccentric wheel, and one end of the traction rope is fitted and wound in the two groups of annular grooves.

[0015] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, one side of the receiving tray is connected to a plug plate, the receiving tray is located above the plug plate and is connected to a top block, one end of the top block is provided with a slope, and a connecting plate is provided on one side of the receiving tray.

[0016] As an optional solution of the mobile phone nut mechanical picking assembly described in the present invention, the top of the second eccentric wheel is connected to a shift rod, one side of the plug plate is slidably connected to a shift block, a shift slot is provided in the shift block, the top of the shift rod extends into the shift slot, and the shift slot and the shift rod are clearance-matched.

[0017] The present invention has the following beneficial effects:

[0018] 1. This mobile phone nut mechanical picking assembly has two sets of movable frames arranged in sequence within a cabinet, which respectively drive the picker to move in the X and Y directions. It can move over the receiving tray over the widest possible range, confirm whether the nuts are leaking, reversed, or stacked, and ensure that the picker picks up the nuts as completely as possible.

[0019] 2. This mobile phone nut mechanical pickup assembly has two sets of tracks symmetrically arranged on the inner wall of the cabinet. A movable plate is slidably arranged between the two sets of tracks. The movable plate is used to support the funnel. At the same time, a spring and a guide rod are connected to the top of the movable plate. The guide rod is slidably connected to the positioning plate, thereby ensuring that the funnel can follow the movable plate to reciprocate and rise and fall within the two sets of tracks, thereby preventing smaller and lighter nuts from getting stuck in the funnel and hindering the subsequent nut from falling;

[0020] 3. This mobile phone nut mechanical picking assembly is characterized in that a first eccentric wheel is installed at one end of the support shaft, a limiting groove is provided in the first eccentric wheel, a push rod is connected to the bottom of the movable plate, a ball head is connected to the bottom end of the push rod, and the ball head is arranged in the limiting groove by utilizing the gap of the ball head. Since the first eccentric wheel is arranged as an eccentric structure, the movable plate and the funnel on one side of the movable plate can be vertically raised while the first eccentric wheel rotates. When the first eccentric wheel rotates to the low position, the funnel is pushed downward by the spring, so that the funnel falls, finally satisfying the vertical lifting drive of the funnel and meeting the requirement that the above-mentioned nut falls smoothly;

[0021] 4. This kind of mechanical picking component for mobile phone nuts is equipped with a traction component, which is sequentially provided with a support shaft and a traction rope wound on the support shaft. The traction rope is used to drive the first eccentric wheel and the second eccentric wheel respectively, and the first eccentric wheel is used to drive the funnel to vertically reciprocate and rise and fall. The second eccentric wheel is used to push the top block to drive the receiving plate to produce a certain amplitude of shaking in an inclined state, thereby meeting the requirement of smooth falling of the nuts. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure inside the cabinet of the present invention.

[0023] Figure 2 For the present invention Figure 1 A magnified schematic diagram of the structure in the middle.

[0024] Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the structure at point B in the middle.

[0025] Figure 4 It is a schematic diagram of a partially enlarged structure of the rear view direction of the present invention.

[0026] Figure 5 It is a schematic diagram of the arrangement structure of the funnel and the receiving tray of the present invention.

[0027] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point C in the middle.

[0028] Figure 7 It is a schematic diagram of the structure of the receiving tray of the present invention when viewed from above.

[0029] Figure 8 It is a side structural schematic diagram of the funnel and receiving tray of the present invention.

[0030] Figure 9 For the present invention Figure 8 Enlarged schematic diagram of the structure at point D in the middle.

[0031] In the figure: 1. Cabinet; 2. Bracket; 3. Collection camera; 4. Funnel; 5. Material receiving tray; 6. Pickup; 7. Stand; 8. Mobile stand; 9. Track; 10. Mobile plate; 11. Spring; 12. Positioning plate; 13. Guide rod; 14. Extension plate; 15. Push rod; 16. Ball head; 17. First eccentric wheel; 18. Bearing seat; 19. Torsion spring; 20. Support shaft; 21. Bushing; 22. Traction rope; 23. Support; 24. Connecting block; 25. Double-ear support; 26. Second eccentric wheel; 27. Annular groove; 28. Connecting plate; 29. ​​Insert plate; 30. Shift block; 31. Shift groove; 32. Shift rod; 33. Shift block. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0033] For example 1, please refer to Figures 1 to 9 The present invention discloses a mechanical picking assembly for mobile phone nuts, including a cabinet 1, a bracket 2 installed on the top of the cabinet 1, a collection camera 3 installed on the bracket 2, a movable pickup 6 provided in the cabinet 1, and a receiving tray 5 provided below the pickup 6.

[0034] In this embodiment, a cabinet 1 is provided, and a collection camera 3 is connected to the cabinet 1 through a bracket 2. The collection camera 3 is configured as a CCD camera for detection. The collection camera 3 is used to collect nuts located on a receiving tray 5. The receiving tray 5 is configured as a flexible vibration tray structure. The nuts are then placed on a nut carrier through a pickup 6. A collection camera 3 is also provided on one side of the pickup 6. The detection CCD moves to the top of each nut to confirm whether the nut is leaking, reversed, or stacked.

[0035] The cabinet 1 further comprises a funnel 4 for feeding materials. The funnel 4 is slidably arranged on the inner wall of the cabinet 1 , and a receiving tray 5 is arranged below the funnel 4 .

[0036] In this embodiment, the funnel 4 is connected to the cabinet 1, and the funnel 4 is flat and sloped. The operation of manually replenishing the nut hopper online can be achieved without stopping the equipment and without opening the safety door of the equipment.

[0037] Two groups of vertically arranged mobile racks 8 are respectively arranged in the cabinet 1, one side of one group of mobile racks 8 is connected to the vertical rack 7, the picker 6 is installed on one side of the vertical rack 7, and the other group of mobile racks 8 is installed on one side of the above-mentioned mobile racks 8.

[0038] In this embodiment, two groups of mobile frames 8 are provided, one group of mobile frames 8 is provided in the horizontal X direction, and the other group of mobile frames 8 is provided in the horizontal Y direction, so that the mobile frames 8 can drive the vertical frame 7 and the picker 6 to move as far as possible above the receiving tray 5.

[0039] Example 2: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 9 A movable plate 10 is connected to one side of the funnel 4, and two sets of tracks 9 are symmetrically installed on one side of the inner wall of the cabinet 1. The movable plate 10 is slidably connected between the two sets of tracks 9. A guide rod 13 is connected to the top of the movable plate 10. A positioning plate 12 is provided on one side of the inner wall of the cabinet 1. One end of the guide rod 13 is slidably connected to the positioning plate 12. A spring 11 is connected between the positioning plate 12 and the movable plate 10, and the spring 11 is sleeved on the outside of the guide rod 13.

[0040] In this embodiment, two sets of tracks 9 are symmetrically arranged on the inner wall of the cabinet 1, and a movable plate 10 is slidably arranged between the two sets of tracks 9. The funnel 4 is connected to one side of the movable plate 10. The top of the movable plate 10 is connected to a spring 11 and a guide rod 13. The spring 11 is sleeved on the outside of the guide rod 13, and the guide rod 13 is slidably connected to the positioning plate 12, thereby ensuring that the funnel 4 can follow the movable plate 10 to reciprocate and rise and fall in the two sets of tracks 9, thereby preventing smaller and lighter nuts from being blocked in the funnel 4 and hindering the subsequent nuts from falling.

[0041] The receiving tray 5 is movably arranged in the cabinet 1. During the movement of the picker 6, the funnel 4 can be driven to lift and reciprocate by the traction assembly. The traction assembly includes a support shaft 20 rotatably mounted on the inner wall of the cabinet 1. The surface of the support shaft 20 is keyed to a traction rope 22. One end of the traction rope 22 is wound around the surface of the shaft sleeve 21, and the other end of the traction rope 22 is fixedly connected to one side of the stand 7. The surface of the support shaft 20 is located below the movable plate 10 and is fixedly mounted with a first eccentric wheel 17. An extension plate 14 is installed at the bottom of the movable plate 10. The bottom surface of the extension plate 14 is connected to a push rod 15. A ball head 16 is provided at the bottom of the push rod 15. A limiting groove matching the ball head 16 is opened in the first eccentric wheel 17. Bearing seats 18 are provided at both ends of the support shaft 20. The bearing seat 18 is fixedly mounted on the inner wall of the cabinet 1, and torsion springs 19 are provided at both ends of the bearing seat 18 and the support shaft 20.

[0042] In this embodiment, a traction assembly is provided between the pickup 6 and the funnel 4, and the traction assembly includes a support shaft 20. The support shaft 20 is rotatably provided on the inner wall of one side of the cabinet 1, and a shaft sleeve 21 is installed at one end of the surface of the support shaft 20. A traction rope 22 is wrapped around the surface of the shaft sleeve 21. The traction rope 22 is connected to one side of the stand 7 at one end away from the support shaft 20. During the movement of the stand 7, the traction rope 22 can be pulled. When the traction rope 22 is pulled, the support shaft 20 will be pulled to rotate.

[0043] A first eccentric wheel 17 is installed at one end of the support shaft 20, and a limiting groove is provided in the first eccentric wheel 17. A push rod 15 is connected to the bottom of the movable plate 10, and a ball head 16 is connected to the bottom end of the push rod 15. The ball head 16 is set in the limiting groove using the gap. Since the first eccentric wheel 17 is set as an eccentric structure, the movable plate 10 and the funnel 4 on one side of the movable plate 10 can be vertically raised while the first eccentric wheel 17 rotates. When the first eccentric wheel 17 rotates to a low position, the spring 11 is used to push the funnel 4 downward, so that the funnel 4 falls, and finally the vertical lifting and lowering drive of the funnel 4 is satisfied, and the requirement for the above-mentioned nut to fall smoothly is met.

[0044] Example 3: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 9 Inside the cabinet 1, two sets of supports 23 are located below the receiving tray 5. These supports 23 are pin-connected to the receiving tray 5, which is tilted. Two sets of connecting blocks 24 are symmetrically arranged on the bottom surface of the receiving tray 5. Two-ear supports 25 are connected to these supports 23, and these connecting blocks 24 are pin-connected to the two-ear supports 25. Two sets of second eccentric wheels 26 are located on one side of one set of supports 23. These second eccentric wheels 26 have an annular groove 27 formed therein. One end of the traction rope 22 is snugly wrapped around these two sets of annular grooves 27.

[0045] In this embodiment, two groups of supports 23 are arranged under the receiving tray 5, and the supports 23 and the receiving tray 5 are pinned in sequence through the connecting block 24 and the double-ear support 25. In addition to the inclined setting of the receiving tray 5, the pin connection structure can make the receiving tray 5 produce a certain range of movement and shake, which can further prevent the nuts from accumulating on one side of the receiving tray 5 after falling through the funnel 4, affecting the detection of the nuts by the detection CCD and the grasping of the nuts by the picker 6.

[0046] Example 4: This example is an explanation based on Example 1. For details, please refer to Figures 1 to 9 During the movement of the picker 6, the receiving tray 5 can be driven to reciprocate in the horizontal direction by the traction assembly. A plug plate 29 is connected to one side of the receiving tray 5. A top block 33 is connected to the receiving tray 5 above the plug plate 29. One end of the top block 33 has an inclined surface. A connecting plate 28 is provided on one side of the receiving tray 5. A shifting rod 32 is connected to the top of the second eccentric wheel 26. A shifting block 30 is slidably connected to one side of the plug plate 29. A shifting slot 31 is provided in the shifting block 30. The top end of the shifting rod 32 extends into the shifting slot 31, and the shifting slot 31 and the shifting rod 32 have a clearance fit.

[0047] In this embodiment, the traction rope 22 is wound around the surface of the second eccentric wheel 26. During the movement of the traction rope 22, the second eccentric wheel 26 can be driven to rotate. The second eccentric wheel 26 is rotatably connected to one side of the support 23. A shift rod 32 is provided on the upper surface of the second eccentric wheel 26. At the same time, a plug plate 29 is connected to one side of the receiving tray 5 through a connecting plate 28. A shift block 30 is slidably connected to one side of the plug plate 29. A shift groove 31 is provided on one side of the shift block 30. The shift rod 32 extends into the shift groove 31. The shift groove 31 follows the movement of the second eccentric wheel 26. The nut is moved to the desired position on the receiving tray 5, so that the detection CCD can accurately detect the state of the nut, and the pickup 6 can also accurately pick up the nut.

[0048] It should be noted that the traction rope 22 can be wound around the annular groove 27 for at least two turns in the structure where the traction rope 22 and the second eccentric wheel 26 are wound to prevent the traction rope 22 from being separated from the second eccentric wheel 26. The mobile frame 8 will not interfere with other structures under traction in the X and Y directions.

[0049] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "includes," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0050] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A mobile phone nut mechanical picking assembly, comprising a cabinet (1), a bracket (2) mounted on the top of the cabinet (1), a collection camera (3) mounted on the bracket (2), a movable picker (6) disposed in the cabinet (1), a receiving tray (5) disposed below the picker (6), and characterized in that: It also includes a funnel (4) for feeding materials, wherein the funnel (4) is slidably arranged on the inner wall of the cabinet (1), and the receiving tray (5) is arranged below the funnel (4); The receiving tray (5) is movably arranged in the cabinet (1); during the movement of the picker (6), the funnel (4) can be driven to move up and down by the traction component; and during the movement of the picker (6), the receiving tray (5) can be driven to move back and forth in the horizontal direction by the traction component.

2. A mobile phone nut mechanical pickup assembly according to claim 1, characterized in that: Two groups of vertically arranged mobile racks (8) are respectively provided in the cabinet (1), one side of one group of the mobile racks (8) is connected to a vertical rack (7), the picker (6) is installed on one side of the vertical rack (7), and the other group of the mobile racks (8) is installed on one side of the mobile rack (8).

3. The mobile phone nut mechanical pickup assembly according to claim 1, characterized in that: A movable plate (10) is connected to one side of the funnel (4), two sets of tracks (9) are symmetrically installed on one side of the inner wall of the cabinet (1), the movable plate (10) is slidably connected between the two sets of tracks (9), a guide rod (13) is connected to the top of the movable plate (10), a positioning plate (12) is provided on one side of the inner wall of the cabinet (1), one end of the guide rod (13) is slidably connected to the positioning plate (12), a spring (11) is connected between the positioning plate (12) and the movable plate (10), and the spring (11) is sleeved on the outside of the guide rod (13).

4. A mobile phone nut mechanical pickup assembly according to claim 3, characterized in that: The traction assembly comprises a support shaft (20) rotatably mounted on the inner wall of the cabinet (1); a traction rope (22) is keyed to the surface of the support shaft (20); one end of the traction rope (22) is wound around the surface of the shaft sleeve (21); and the other end of the traction rope (22) is fixedly connected to one side of the stand (7).

5. The mobile phone nut mechanical pickup assembly according to claim 4, characterized in that: A first eccentric wheel (17) is fixedly mounted on the surface of the support shaft (20) below the movable plate (10), an extension plate (14) is mounted on the bottom of the movable plate (10), a top rod (15) is connected to the bottom surface of the extension plate (14), a ball head (16) is provided at the bottom end of the top rod (15), and a limiting groove matching the ball head (16) is provided in the first eccentric wheel (17).

6. The mobile phone nut mechanical pickup assembly according to claim 4, characterized in that: Both ends of the support shaft (20) are provided with bearing seats (18), the bearing seats (18) are fixedly mounted on the inner wall of the cabinet (1), and both ends of the bearing seats (18) and the support shaft (20) are provided with torsion springs (19).

7. The mobile phone nut mechanical pickup assembly according to claim 4, characterized in that: Two groups of supports (23) are provided in the cabinet (1) below the receiving tray (5), the supports (23) and the receiving tray (5) are pin-connected, the receiving tray (5) is arranged in an inclined manner, and two groups of connecting blocks (24) are symmetrically provided on the bottom surface of the receiving tray (5), the supports (23) are connected to double-ear supports (25), and the connecting blocks (24) and the double-ear supports (25) are pin-connected.

8. The mobile phone nut mechanical pickup assembly according to claim 7, characterized in that: Two sets of second eccentric wheels (26) are provided on one side of one set of the supports (23), an annular groove (27) is provided in the second eccentric wheels (26), and one end of the traction rope (22) is fitted and wound in the two sets of annular grooves (27).

9. The mobile phone nut mechanical pickup assembly according to claim 8, characterized in that: One side of the receiving tray (5) is connected to an inserting plate (29), and the receiving tray (5) is connected to a top block (33) located above the inserting plate (29). One end of the top block (33) is provided with an inclined surface, and one side of the receiving tray (5) is provided with a connecting plate (28).

10. The mobile phone nut mechanical pickup assembly according to claim 9, characterized in that: The top of the second eccentric wheel (26) is connected to a shifting rod (32), and one side of the inserting plate (29) is slidably connected to a shifting block (30). A shifting slot (31) is provided in the shifting block (30), and the top of the shifting rod (32) extends into the shifting slot (31), and the shifting slot (31) and the shifting rod (32) are clearance-matched.

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