Spot welding device for PCBA machining

Abstract

The utility model relates to the technical field of PCBA (printed circuit board assembly) processing, in particular to a spot welding device for PCBA processing. Comprising a base and further comprises a supporting frame fixedly connected to the upper surface of the base, and spot welding equipment is arranged below the supporting frame; and the rotating disc is located above the base, and a plurality of placing frames are fixedly connected to the upper surface of the rotating disc. According to the PCBA board spot welding device, PCBA boards of different specifications can be effectively fixed through the arranged fixing assembly, so that the situation that the PCBA boards are displaced in the machining process, and the machining effect is affected is avoided, other PCBA boards can be conveniently moved to the position under spot welding equipment through the arranged driving assembly, and the spot welding efficiency is improved. According to the PCBA board spot welding device, the PCBA board is arranged, so that spot welding treatment can be conveniently conducted on other PCBA boards through spot welding equipment, the spot welding efficiency of the PCBA boards is effectively improved, poisonous gas can be effectively adsorbed and filtered through the arranged gas suction assembly, and therefore the body health of workers is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of PCBA board processing, in particular to a spot welding device for PCBA processing. Background Art

[0002] PCBA board is the actual circuit board. The main base material is generally classified according to the insulating part of the substrate. Common raw materials are bakelite, fiberglass board, and various plastic boards. The main processing process of PCBA board is generally to integrate parts on the PCB board through SMT and DIP. The main difference is that SMT does not require drilling holes on the PCB, while DIP requires the PIN pins of the parts to be inserted into the already drilled holes. When processing the PCBA board, a spot welding device for PCBA processing is required.

[0003] The spot welding device in the prior art can only fix and place a PCBA board of a fixed specification when spot welding the PCBA board, but cannot effectively fix PCBA boards of different specifications. This will cause the PCBA boards of different specifications to be displaced during the spot welding process, thereby affecting the spot welding effect of the PCBA board and reducing the practicality of the spot welding device. In addition, a large amount of toxic gas will be generated when the PCBA board is spot welded, and the spot welding device in the prior art does not have a structure for adsorbing and filtering the toxic gas. This will cause the staff to inhale a large amount of toxic gas when processing the PCBA board, thereby affecting the health of the staff.

[0004] Compared with the Chinese patent with publication number CN217166914U, the utility model discloses a spot welding device for PCBA processing, which relates to the field of PCBA board processing, including a fixed seat, a rotating disc is rotatably arranged on the top of the fixed seat, and a plurality of material boxes are inserted along the circumferential direction on the side wall of the rotating disc, and the material box includes a fixed block, an insert block and a mounting groove, and an insert block is arranged at the bottom of the fixed block, and the fixed block is inserted into the side wall of the rotating disc through the insert block. The utility model realizes the loading of the PCBA board by rotating the rotating disc, the PCBA board is placed in the mounting groove of the material box, each material box can hold a plurality of PCBA boards, and the material box is inserted into the rotating disc through the insert block, and the rotation of the rotating disc can drive the PCBA board on the material box to enter the spot welding station of the spot welding mechanism for processing, and there is no need to repeatedly load the material manually in sequence, and multiple PCBA boards can be processed at one time, with high processing efficiency and better use effect; the material box with the PCBA board can be stored on a placement plate on one side, inserted into the slot, and can be used as a temporary storage point of the material box, which is convenient for loading and unloading the material box during the spot welding process.

[0005] The above scheme can very conveniently process multiple PCBA boards at one time, but the size of the mounting slots in the above scheme is fixed, and it is still impossible to fix PCBA boards of different specifications. In addition, the above scheme still does not have a structure for adsorbing and filtering toxic gases, and fails to solve the problems raised in the above background technology.

[0006] Therefore, those skilled in the art provide a spot welding device for PCBA processing to solve the problems raised in the above background technology. Utility Model Content

[0007] The purpose of the utility model is to provide a spot welding device for PCBA processing, including a base, and also including:

[0008] A support frame, fixedly connected to the upper surface of the base, and a spot welding device is provided below the support frame;

[0009] A turntable is located above the base, and a plurality of placement frames are fixedly connected to the upper surface of the turntable;

[0010] A fixing component is arranged outside the plurality of placement frames and is used to fix and clamp PCBA boards of different specifications in the placement frames;

[0011] A driving assembly, disposed on the upper surface of the base and used to drive the turntable to rotate synchronously;

[0012] The air suction component is arranged on the upper surface of the support frame and is used for adsorbing and filtering the toxic gas generated during the spot welding of the PCBA board.

[0013] As a further improvement of the present technical solution, the fixing component includes an adjustment plate fixedly connected to the outside of multiple placement frames, the adjustment plate is rotatably connected to a bidirectional threaded rod inside, the bidirectional threaded rod is fixedly connected to a knob outside, the adjustment plate and the placement frame are both provided with movable grooves for the knob to move, the bidirectional threaded rod is symmetrically provided with threaded blocks outside, every two threaded blocks are hinged with an articulated block inside through a connecting rod, the articulated block is fixedly connected to a splint outside, and the adjustment plate and the placement frame are both provided with guide grooves for the connecting rod to move outside.

[0014] As a further improvement of the present technical solution, the driving assembly includes a driving box fixedly connected to the upper surface of the base, a first motor is fixedly connected to one side of the driving box, an output shaft of the first motor is fixedly connected to a driving rod through a coupling, the other end of the driving rod is fixedly connected to a first bevel gear, the inner bottom end of the driving box is rotatably connected to a rotating rod, the outside of the rotating rod is fixedly connected to a second bevel gear meshing with the first bevel gear, and the top of the rotating rod is fixedly connected to the bottom of the turntable.

[0015] As a further improvement of the present technical solution, the air suction assembly includes a filter box and an air suction pump respectively arranged on the upper surface of the support frame; the outside of the spot welding equipment is fixedly connected with a fixing block for fixing the air suction head; the air inlet end of the air suction pump is connected with the interior of the air suction head through a pipe; the air outlet end of the air suction pump is connected with the interior of the filter box through a pipe; the other side of the filter box is connected with an exhaust pipe; and an activated carbon filter is provided inside the filter box.

[0016] As a further improvement of the present technical solution, a transmission plate is fixedly connected to the bottom of the support frame, a second motor is fixedly connected to the outside of the support frame, an output shaft of the second motor is fixedly connected to a screw rod through a coupling, the other end of the screw rod is rotatably connected to the inner wall of the transmission plate, a moving block is threadedly connected to the outside of the screw rod, a guide groove for movement of the moving block is provided at the bottom of the transmission plate, and the bottom of the moving block is fixedly connected to the upper surface of the spot welding equipment.

[0017] As a further improvement of the present technical solution, a clamping plate is fixedly connected to the inner bottom end of the filter box, and the upper surface of the clamping plate is provided with a clamping groove for clamping an activated carbon filter screen, and the upper surface of the activated carbon filter screen is fixedly connected to a connecting plate, and the upper surface of the filter box is provided with a guide groove for the activated carbon filter screen to move, and the bottom of the connecting plate is symmetrically provided with mounting blocks, the front end surface and the rear end surface of the filter box are fixedly connected to a fixing frame, the upper surfaces of the two fixing frames are provided with guide grooves for the movement of the mounting blocks, and the outsides of the two fixing frames are fixedly connected to a fixing sleeve, and a fixing rod is provided inside the fixing sleeve, one end of the fixing rod extends to the outside of the fixing sleeve and is fixedly connected with a pull plate, and the outside of the fixing rod is fixedly connected with a resistance plate, and a reset spring is sleeved on the outside of the fixing rod, and the reset spring is in contact with the resistance plate and the fixing sleeve, and the insides of the two mounting blocks are provided with guide grooves for the movement of the fixing rods.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] In the spot welding device for PCBA processing, by setting a fixing component, a driving component and an air suction component, when the PCBA board needs to be spot welded, it is only necessary to place the PCBA board inside the placement frame first, and then fix and clamp the PCBA boards of different specifications through the fixing component. At this time, displacement of the PCBA board during the spot welding process can be prevented, which affects the processing effect of the PCBA board. When the PCBA board is fixed, the spot welding equipment starts to run. At this time, the PCBA board can be spot welded by the spot welding equipment. When other PCBA boards need to be spot welded, During the spot welding process, the driving component starts to run, driving the turntable to rotate synchronously, and the turntable then drives the PCBA board to move synchronously. When other PCBA boards move to the bottom of the spot welding equipment, the spot welding equipment can be used to spot weld other PCBA boards, thereby effectively improving the spot welding efficiency of the spot welding device. In the process of spot welding the PCBA board, a large amount of toxic gas will be generated. At this time, the suction component starts to run, and the suction component can effectively adsorb and filter the toxic gas, and then discharge the filtered gas, thereby effectively protecting the health of the staff and saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the cutaway three-dimensional structure of the adjustment plate in the utility model;

[0022] Figure 3 It is a cutaway three-dimensional structural schematic diagram of the drive box in the utility model;

[0023] Figure 4 It is a cutaway three-dimensional structural schematic diagram of the fixed sleeve in the utility model;

[0024] Figure 5 It is a cutaway three-dimensional structural schematic diagram of the filter box in the utility model;

[0025] Figure 6 It is a schematic diagram of the cutaway three-dimensional structure of the transmission plate in the utility model.

[0026] The meaning of each number in the figure is:

[0027] 1. Base; 2. Support frame; 3. Turntable; 4. Placement frame; 5. Adjustment plate; 6. Suction pump; 7. Filter box; 8. Spot welding equipment; 9. Fixed block; 10. Suction head; 11. Knob; 12. Bidirectional threaded rod; 13. Threaded block; 14. Connecting rod; 15. Articulated block; 16. Clamp; 17. Drive box; 18. First motor; 19. Drive rod; 20. First bevel gear; 21. Second bevel gear; 22. Rotating rod; 23. Connecting plate; 24. Activated carbon filter; 25. Mounting block; 26. Fixed frame; 27. Fixed sleeve; 28. Fixed rod; 29. ​​Contact plate; 30. Reset spring; 31. Snap-in plate; 32. Exhaust pipe; 33. Transmission plate; 34. Second motor; 35. Screw; 36. Moving block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1 - Figure 6 As shown, this embodiment provides a spot welding device for PCBA processing, including a base 1, and also including:

[0030] The support frame 2 is fixedly connected to the upper surface of the base 1, and a spot welding device 8 is provided below the support frame 2;

[0031] A turntable 3 is located above the base 1, and a plurality of placement frames 4 are fixedly connected to the upper surface of the turntable 3;

[0032] A fixing component is arranged outside the plurality of placement frames 4 and is used to fix and clamp PCBA boards of different specifications in the placement frames 4;

[0033] A driving assembly is disposed on the upper surface of the base 1 and is used to drive the turntable 3 to rotate synchronously;

[0034] The air suction component is arranged on the upper surface of the support frame 2 and is used for adsorbing and filtering the toxic gas generated during the spot welding process of the PCBA board.

[0035] The above working principle: when the PCBA board needs to be spot-welded, it is only necessary to place the PCBA board inside the placement frame 4 first, and then fix and clamp the PCBA boards of different specifications through the fixing components. At this time, the PCBA board can be prevented from displacement during the spot-welding process, which affects the processing effect of the PCBA board. When the PCBA board is fixed, the spot welding device 8 starts to run. At this time, the PCBA board can be spot-welded by the spot welding device 8. When other PCBA boards need to be spot-welded, the driving component starts to run, driving the rotating The disk 3 rotates synchronously, and the turntable 3 drives the PCBA board to move synchronously. When other PCBA boards move to the bottom of the spot welding device 8, the spot welding device 8 can be used to spot weld other PCBA boards, thereby effectively improving the spot welding efficiency of the spot welding device. In the process of spot welding the PCBA board, a large amount of toxic gas will be generated. At this time, the air suction component starts to operate. The air suction component can effectively adsorb and filter the toxic gas, and then discharge the filtered gas, thereby effectively protecting the health of the staff and saving time and effort.

[0036] In order to effectively fix and clamp PCBA boards of different specifications, the fixing component includes an adjustment plate 5 fixedly connected to the outside of multiple placement frames 4, the inside of the adjustment plate 5 is rotatably connected to a bidirectional threaded rod 12, the outside of the bidirectional threaded rod 12 is fixedly connected to a knob 11, the outside of the adjustment plate 5 and the placement frame 4 are both provided with movable grooves for the knob 11 to move, the outside of the bidirectional threaded rod 12 is symmetrically provided with thread blocks 13, the inside of each two thread blocks 13 is hinged with an articulated block 15 through a connecting rod 14, the outside of the articulated block 15 is fixedly connected to a clamping plate 16, the outside of the adjustment plate 5 and the placement frame 4 are both provided with guide grooves for the connecting rod 14 to move, when it is necessary to fix PCBA boards of different specifications When the PCBA board is placed inside the placement frame 4, it is only necessary to first place the PCBA board inside the placement frame 4, and then turn the knob 11. At this time, the knob 11 will drive the bidirectional threaded rod 12 to rotate synchronously, and the threaded block 13 will move synchronously outside the bidirectional threaded rod 12. Since the threaded block 13 and the hinge block 15 are hinged through the connecting rod 14, the threaded block 13 will drive the hinge block 15 to move synchronously through the connecting rod 14, and the hinge block 15 will drive the clamping plate 16 to move synchronously. When the clamping plate 16 conflicts with the outside of the PCBA board, the clamping plate 16 can be used to fix PCBA boards of different specifications, thereby preventing the PCBA board from being displaced during the spot welding process, which affects the spot welding effect.

[0037] Considering that when spot welding other PCBA boards, it is necessary to move other PCBA boards to just below the spot welding device 8, the driving assembly includes a driving box 17 fixedly connected to the upper surface of the base 1, one side of the driving box 17 is fixedly connected to a first motor 18, the output shaft of the first motor 18 is fixedly connected to a driving rod 19 through a coupling, the other end of the driving rod 19 is fixedly connected to a first bevel gear 20, the inner bottom end of the driving box 17 is rotatably connected to a rotating rod 22, the outer side of the rotating rod 22 is fixedly connected to a second bevel gear 21 meshing with the first bevel gear 20, the top end of the rotating rod 22 is fixedly connected to the bottom of the turntable 3 When it is necessary to perform spot welding on other PCBA boards, the first motor 18 starts to run, driving the driving rod 19 to rotate synchronously, the driving rod 19 then drives the first bevel gear 20 to rotate synchronously, the first bevel gear 20 drives the second bevel gear 21 to rotate synchronously, the second bevel gear 21 then drives the rotating rod 22 to rotate synchronously, the rotating rod 22 then drives the turntable 3 to rotate synchronously, the turntable 3 then drives other PCBA boards to move synchronously, at this time, the other PCBA boards can be moved to the bottom of the spot welding device 8, so that the spot welding device 8 can effectively perform spot welding on other PCBA boards.

[0038] In order to effectively adsorb and filter the toxic gas generated when the PCBA board is spot welded, the air suction component includes a filter box 7 and an air pump 6 respectively arranged on the upper surface of the support frame 2. The outside of the spot welding device 8 is fixedly connected with a fixing block 9 for fixing the air suction head 10. The air inlet end of the air pump 6 is connected to the inside of the air suction head 10 through a pipeline, and the air outlet end of the air pump 6 is connected to the inside of the filter box 7 through a pipeline. The other side of the filter box 7 is connected to an exhaust pipe 32. The inside of the filter box 7 is provided with an activated carbon filter 24. During the spot welding process of the PCBA board, a large amount of toxic gas will be generated. At this time, the air pump 6 starts to run. The air pump 6 can effectively draw the toxic gas into the filter box 7 through the air suction head 10. When the toxic gas enters the inside of the filter box 7, the activated carbon filter 24 can effectively filter the toxic gas. The filtered gas will be discharged through the exhaust pipe 32. At this time, the toxic gas can be conveniently filtered, thereby preventing the toxic gas from affecting the health of the staff.

[0039] In order to conveniently adjust the horizontal position of the spot welding device 8 so that the spot welding device 8 can perform spot welding on the PCBA board according to actual needs, a transmission plate 33 is fixedly connected to the bottom of the support frame 2, and a second motor 34 is fixedly connected to the outside of the support frame 2. The output shaft of the second motor 34 is fixedly connected to a screw rod 35 through a coupling, and the other end of the screw rod 35 is rotatably connected to the inner side wall of the transmission plate 33. The external thread of the screw rod 35 is connected to a moving block 36. A guide groove for the movement of the moving block 36 is provided at the bottom of the transmission plate 33. The bottom of the moving block 36 is fixedly connected to the upper surface of the spot welding device 8. When the horizontal position of the spot welding device 8 needs to be adjusted, the second motor 34 starts to run, driving the screw rod 35 to rotate synchronously. At this time, the moving block 36 will move synchronously on the outside of the screw rod 35, driving the spot welding device 8 to move synchronously. At this time, the horizontal position of the spot welding device 8 can be adjusted according to actual needs.

[0040] In addition, in order to facilitate the staff to disassemble, replace or clean the activated carbon filter 24, a clamping plate 31 is fixedly connected to the bottom end of the filter box 7, and a clamping groove for clamping the activated carbon filter 24 is provided on the upper surface of the clamping plate 31. The upper surface of the activated carbon filter 24 is fixedly connected to the connecting plate 23. The upper surface of the filter box 7 is provided with a guide groove for the active carbon filter 24 to move. The bottom of the connecting plate 23 is symmetrically provided with a mounting block 25. The front end surface and the rear end surface of the filter box 7 are fixedly connected to the fixing frame 26. The upper surfaces of the two fixing frames 26 are provided with There is a guide groove for the movement of the mounting block 25, the outside of the two fixing frames 26 are fixedly connected with a fixing sleeve 27, the inside of the fixing sleeve 27 is provided with a fixing rod 28, one end of the fixing rod 28 extends to the outside of the fixing sleeve 27 and is fixedly connected with a pull plate, the outside of the fixing rod 28 is fixedly connected with a contact plate 29, the outside of the fixing rod 28 is sleeved with a reset spring 30, the reset spring 30 is in contact between the contact plate 29 and the fixing sleeve 27, and the inside of the two mounting blocks 25 are provided with a guide groove for the movement of the fixing rod 28. When the activated carbon filter 24 needs to be disassembled, only It is necessary to pull the pull plate first, at this time the pull plate will drive the fixing rod 28 to move synchronously, and the fixing rod 28 will drive the contact plate 29 to move synchronously. During the movement of the contact plate 29, the reset spring 30 will be squeezed. When the fixing rod 28 is out of the guide groove inside the mounting block 25, the connecting plate 23 is pulled. At this time, the connecting plate 23 will drive the activated carbon filter 24 and the mounting block 25 to move synchronously. When the mounting block 25 is out of the interior of the fixing frame 26, the activated carbon filter 24 can be disassembled. When the activated carbon filter 24 needs to be installed, only the active carbon filter 24 needs to be removed first. The activated carbon filter 24 is inserted into the clamping groove on the upper surface of the clamping plate 31. At this time, the connecting plate 23 will also drive the mounting block 25 to be synchronously inserted into the guide groove on the upper surface of the fixed frame 26. When the mounting block 25 is fully inserted into the interior of the fixed frame 26, the pull plate is released. At this time, the reset spring 30 is reset, driving the resistance plate 29 to move synchronously, and the resistance plate 29 drives the fixing rod 28 to move synchronously. When the fixing rod 28 is inserted into the guide groove inside the mounting block 25, the mounting block 25 and the fixing frame 26 can be fixed. At this time, the activated carbon filter 24 can be installed.

[0041] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the utility model and are not used to limit the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A spot welding device for PCBA processing, comprising a base (1), characterized in that: Also includes: A support frame (2) is fixedly connected to the upper surface of the base (1), and a spot welding device (8) is provided below the support frame (2); A turntable (3) is located above the base (1), and a plurality of placement frames (4) are fixedly connected to the upper surface of the turntable (3); A fixing component is arranged outside the plurality of placement frames (4) and is used to fix and clamp PCBA boards of different specifications in the placement frames (4); A driving assembly, arranged on the upper surface of the base (1) and used to drive the turntable (3) to rotate synchronously; The air intake component is arranged on the upper surface of the support frame (2) and is used to absorb and filter the toxic gas generated during the spot welding of the PCBA board.

2. A spot welding device for PCBA processing according to claim 1, characterized in that: The fixing assembly comprises an adjustment plate (5) fixedly connected to the outside of a plurality of placement frames (4); the adjustment plate (5) is rotatably connected to a bidirectional threaded rod (12) inside; the bidirectional threaded rod (12) is fixedly connected to a knob (11) outside; the adjustment plate (5) and the placement frame (4) are both provided with movable grooves for the knob (11) to move outside; the bidirectional threaded rod (12) is symmetrically provided with thread blocks (13) outside; each two thread blocks (13) are hingedly connected to an articulated block (15) inside through a connecting rod (14); the articulated block (15) is fixedly connected to a clamping plate (16) outside; the adjustment plate (5) and the placement frame (4) are both provided with guide grooves for the connecting rod (14) to move outside.

3. A spot welding device for PCBA processing according to claim 1, characterized in that: The driving assembly comprises a driving box (17) fixedly connected to the upper surface of the base (1); a first motor (18) is fixedly connected to one side of the driving box (17); an output shaft of the first motor (18) is fixedly connected to a driving rod (19) via a coupling; the other end of the driving rod (19) is fixedly connected to a first bevel gear (20); an inner bottom end of the driving box (17) is rotatably connected to a rotating rod (22); an outer portion of the rotating rod (22) is fixedly connected to a second bevel gear (21) meshing with the first bevel gear (20); and a top end of the rotating rod (22) is fixedly connected to the bottom of the turntable (3).

4. A spot welding device for PCBA processing according to claim 1, characterized in that: The air suction component comprises a filter box (7) and an air suction pump (6) respectively arranged on the upper surface of the support frame (2); the outside of the spot welding device (8) is fixedly connected to a fixing block (9) for fixing the air suction head (10); the air inlet end of the air suction pump (6) is connected to the inside of the air suction head (10) through a pipeline; the air outlet end of the air suction pump (6) is connected to the inside of the filter box (7) through a pipeline; the other side of the filter box (7) is connected to an exhaust pipe (32); and the inside of the filter box (7) is provided with an activated carbon filter (24).

5. A spot welding device for PCBA processing according to claim 1, characterized in that: The bottom of the support frame (2) is fixedly connected to a transmission plate (33), the outside of the support frame (2) is fixedly connected to a second motor (34), the output shaft of the second motor (34) is fixedly connected to a screw rod (35) via a coupling, the other end of the screw rod (35) is rotatably connected to the inner wall of the transmission plate (33), the outer thread of the screw rod (35) is connected to a moving block (36), the bottom of the transmission plate (33) is provided with a guide groove for the moving block (36) to move, and the bottom of the moving block (36) is fixedly connected to the upper surface of the spot welding device (8).

6. A spot welding device for PCBA processing according to claim 4, characterized in that: The bottom end of the filter box (7) is fixedly connected to a clamping plate (31), the upper surface of the clamping plate (31) is provided with a clamping groove for clamping an activated carbon filter (24), the upper surface of the activated carbon filter (24) is fixedly connected to a connecting plate (23), the upper surface of the filter box (7) is provided with a guide groove for the activated carbon filter (24) to move, the bottom of the connecting plate (23) is symmetrically provided with mounting blocks (25), the front end surface and the rear end surface of the filter box (7) are both fixedly connected to fixing frames (26), the upper surfaces of the two fixing frames (26) are provided with guide grooves for the movable mounting blocks (25), and the upper surfaces of the two fixing frames (26) are provided with guide grooves for the movable mounting blocks (25). The two fixing frames (26) are both fixedly connected with fixing sleeves (27) on the outside, a fixing rod (28) is provided inside the fixing sleeve (27), one end of the fixing rod (28) extends to the outside of the fixing sleeve (27) and is fixedly connected with a pull plate, the fixing rod (28) is fixedly connected with a contact plate (29) on the outside, a reset spring (30) is sleeved on the outside of the fixing rod (28), and the reset spring (30) is in contact with the contact plate (29) and the fixing sleeve (27), and the two mounting blocks (25) are both provided with guide grooves for the fixing rod (28) to move.

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