Guide wheel assembling device

Abstract

The utility model relates to the technical field of guide wheel assembly, and discloses a guide wheel assembly device which comprises a workbench, a fixing assembly and a protective assembly are arranged on the surface of the workbench, the fixing assembly comprises a fixing table, a fixing block, a clamping block, a cavity and a gear, and the guide wheel assembly device is characterized in that the protective assembly is arranged, so that the guide wheel assembly device is convenient to assemble and disassemble. When a clamping block clamps a guide wheel, a knob is continuously rotated, a linkage rod overturns to drive an abutting rod to move close to a circular plate, the surface of the abutting rod abuts against the surface of the circular plate, the circular plate drives a fixed column to move close to a gear, the fixed column enters a connecting groove, a movable block enters a limiting groove, and the inner wall of the limiting groove abuts against the side, away from a second inclined face, of the movable block. When the rotary knob is rotated, the gear can be limited, the gear ring and the rack cannot continue to move, the fixing rod and the fixing block cannot continue to move, and the situation that the rotary knob is not stopped in time, the clamping force is too large, and the guide wheel deforms or is damaged is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to guide wheel group pair technical field, concretely is a guide wheel group pair device. BACKGROUND

[0002] Crawler walking mechanism is the walking part of crawler walking mechanical equipment, and the crawler walking mechanism is mainly composed of guide wheels, tensioning devices, crawler frames, carrier wheels, driving devices, chain wheels and crawler plates, wherein the guide wheels are used for guiding the walking mechanism, and the guide wheels are composed of a rim, a web and a hub by welding, so that the guide wheels need to be welded by a welding device.

[0003] According to a guide wheel group pair welding device (publication number: CN217727717U), the clamping plates in the above-mentioned application are respectively installed on different top plates, and the spacing between the top plates can be adjusted through the telescopic adjustment between the first sleeve rod, the second sleeve rod and the adjusting rod, so that the components on the different top plates can be stably butted, the accuracy of subsequent welding of the components is improved, and the misalignment condition is avoided.

[0004] However, although such a welding device performs well in terms of butt joint accuracy, there are still some problems in the process of clamping and fixing the guide wheels. Specifically, when the operator clamps the guide wheels, if the clamping work is not stopped in time, the clamping force may be too large. Such excessive clamping force not only causes the guide wheels to deform, but also even causes the guide wheels to break, thereby seriously affecting the quality and efficiency of subsequent processing. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a guide wheel group pair device to solve the problems in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a guide wheel group pair device, comprising a workbench, the surface of the workbench is provided with a fixing assembly and a protection assembly, the fixing assembly comprises: a fixing table, a fixing block, a clamping block, a cavity and a gear;

[0007] The protection assembly comprises:

[0008] The connecting rod is used to drive the abutting rod to move;

[0009] The abutting rod is used to abut the circular plate to move it;

[0010] The circular plate is used to drive the fixed column to move synchronously.

[0011] Preferably, one end of the linkage rod is hinged to the surface of the clamping block, the end of the linkage rod away from the clamping block is hinged with the abutting rod, the abutting rod is slidingly connected to the surface of the fixed block, the end of the abutting rod away from the linkage rod penetrates through the fixed table, the inner wall of the cavity is rotatably connected with the round plate, the side of the round plate away from the abutting rod is fixedly connected with the spring two, the end of the spring two away from the round plate is fixed on the inner wall of the cavity, the surface of the gear is provided with the connecting groove, the inner wall of the connecting groove is provided with the limiting groove, the side of the round plate away from the abutting rod is fixedly connected with the fixed column, the surface of the fixed column is provided with the movable groove, the inner wall of the movable groove is slidingly connected with the movable block, the surface of the movable block is fixedly connected with the spring three, the end of the spring three away from the movable block is fixed on the inner wall of the movable groove, the linkage rod is flipped to drive the abutting rod to move close to the round plate, the abutting rod abuts against the surface of the round plate, the round plate drives the fixed column to move close to the gear, the fixed column enters the connecting groove, and at the same time, the movable block enters the limiting groove, the inner wall of the limiting groove abuts against the side of the movable block away from the second inclined surface, so as to limit the gear, at this time, the gear ring and the rack cannot continue to move, and the fixed rod and the fixed block cannot continue to move.

[0012] Preferably, the fixing assembly comprises a groove, the groove is arranged on the surface of the workbench, the inner wall of the groove is rotatably connected with a screw rod one, the screw rod one penetrates through a threaded block, the screw rod one is in threaded connection with the threaded block, the threaded block is slidingly connected with the inner wall of the groove, the surface of the workbench is fixedly connected with a motor one, the output shaft of the motor one penetrates through the workbench, and the output shaft of the motor one is fixed on the surface of the screw rod one, the top of the threaded block is fixedly connected with a moving plate, the moving plate is slidingly connected with the top of the workbench, the side, close to the center of the workbench, of the moving plate is rotatably connected with a rotating plate, the side, away from the moving plate, of the rotating plate is fixedly connected with a fixed table, the side, away from the rotating plate, of the moving plate is fixedly connected with a motor two, the output shaft of the motor two penetrates through the moving plate, and the output shaft of the motor two is fixed on the surface of the rotating plate, the fixing assembly further comprises a limiting piece, the motor one is started in forward rotation, the screw rod one drives the threaded block to move close to each other, the moving plate moves synchronously, the guide wheels abut against each other, the motor two is started, so that the rotating plate drives the fixed table and the guide wheels to rotate, different angles can be welded, and the motor one is started in reverse rotation, so that the guide wheels are loosened.

[0013] Preferably, the limiting piece includes a cavity, the cavity is arranged in the fixed table, the inner wall of the cavity is rotationally connected with a gear ring, the inner wall of the cavity is rotationally connected with a gear, the gear is engaged with the gear ring, the cavity is internally provided with a rack, the rack penetrates the fixed table and is slidably connected with the fixed table, the rack is engaged with the gear, the surface of the rotating plate is fixedly connected with a fixed plate, the rack and the gear are provided with three groups, and the three groups of rack and gear are circumferentially arranged with the center of the fixed table as the axis, the surface of the fixed plate is rotationally connected with a knob, the output shaft of the knob penetrates the fixed plate, the side, away from the knob, of the fixed plate is rotationally connected with a screw rod two, the surface of one of the three groups of rack is provided with a threaded groove, the screw rod two is threadedly connected with the threaded groove, the surface of the rack is fixedly connected with a fixed rod, one end, away from the rack, of the fixed rod penetrates the circular plate and the fixed table, one end, away from the rack, of the fixed rod is fixedly connected with a fixed block, the fixed block is slidably connected with the surface of the fixed table, the surface of the fixed block is provided with a sliding groove, the inner wall of the sliding groove is slidably connected with a clamping block, the surface of the clamping block is fixedly connected with a spring one, one end, away from the clamping block, of the spring one is fixedly connected with the inner wall of the sliding groove, rotating the knob, the screw rod two drives the rack to move close to or away from the center of the fixed table, the gear drives the gear ring to rotate, so that the rack moves radially synchronously, and the fixed rod, the fixed block and the clamping block move synchronously, so that the clamping block clamps or loosens the guide wheel.

[0014] Preferably, the screw rod one is provided with threads at two opposite ends, and the motor one rotates forward or reversely, so as to drive the threaded blocks to move close to or away from each other.

[0015] Preferably, the side, away from the spring three, of the movable block is provided with two inclined surfaces one and two, the inclined surface one abuts against the inner wall of the limiting groove and the connecting groove, with the movement of the fixed column, the movable block moves into the movable groove, and the movement of the fixed column is not affected, the inclined surface two abuts against the inner wall of the limiting groove, so that the movable block moves into the movable groove.

[0016] Preferably, the top of the workbench is fixedly connected with a support frame, the top of the support frame is fixedly connected with a gas cylinder, the output end of the gas cylinder penetrates the support frame, and the bottom of the output end of the gas cylinder is fixedly connected with a welding head, the gas cylinder is turned on, the welding head moves downward, and welding work can be performed.

[0017] Compared with the prior art, the guiding wheel group device has the following beneficial effects:

[0018] 1. The guiding wheel group device, when the clamping block clamps the guiding wheel, the rotating knob is continuously rotated, the connecting rod is turned over to drive the abutting rod to move close to the circular plate, the surface of the abutting rod abuts against the surface of the circular plate, the circular plate drives the fixed column to move close to the gear, the fixed column enters the connecting groove, the movable block enters the limiting groove, the inner wall of the limiting groove abuts against the side of the movable block away from the second inclined surface, the gear is limited, the gear ring and the rack cannot continue to move, the fixed rod and the fixed block cannot continue to move, the rotating knob is not stopped in time, the clamping force is too large, the guiding wheel is deformed or damaged.

[0019] 2. The guiding wheel group device, by setting the fixed assembly, the first motor is started in forward rotation, the threaded block is driven by the first screw rod to move close to each other, the moving plate moves synchronously, the guiding wheels abut against each other, the second motor is started, the rotating plate drives the fixed table and the guiding wheels to rotate, different angles can be welded, the first motor is reversed, the guiding wheels can be loosened, when the guiding wheels abut against each other, the rotating knob is rotated, the rack is driven by the second screw rod to move close to or the center of the fixed table, the gear drives the gear ring to rotate, the racks can move synchronously in the radial direction, the fixed rod, the fixed block and the clamping block can move synchronously, and the clamping block can clamp or loosen the guiding wheel. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a front view structural schematic diagram of the utility model;

[0021] Figure 2 It is a side view structural schematic diagram of the utility model;

[0022] Figure 3 It is a front view structural schematic diagram of the fixed assembly and the protection assembly part of the utility model;

[0023] Figure 4 It is an internal structural schematic diagram of the fixed table of the utility model;

[0024] Figure 5 It is a front view structural schematic diagram of the fixed table of the utility model;

[0025] Figure 6 It is an explosion structural schematic diagram of part of the limiting piece of the utility model;

[0026] Figure 7 It is a sectional view structural schematic diagram of part of the limiting piece of the utility model;

[0027] Figure 8 It is an explosion structural schematic diagram of part of the protection assembly of the utility model.

[0028] In the figure: 1, workbench; 2, support frame; 3, air cylinder; 4, welding head; 5, fixed assembly; 50, groove; 51, screw rod one; 52, threaded block; 53, motor one; 54, moving plate; 55, rotating plate; 56, fixed table; 58, motor two; 57, limiting piece; 570, cavity; 571, gear ring; 572, gear; 573, rack; 574, fixed plate; 575, knob; 576, screw rod two; 577, threaded groove; 578, fixed rod; 579, fixed block; 5700, sliding groove; 5701, clamping block; 5702, spring one; 6, protection assembly; 60, connecting rod; 61, abutting rod; 62, round plate; 63, spring two; 64, connecting groove; 65, limiting groove; 66, fixed column; 67, movable groove; 68, movable block; 69, spring three. DETAILED DESCRIPTION

[0029] As Figures 1-8As shown, the utility model provides a technical scheme: a guide wheel group device, including workbench 1, the surface of workbench 1 is provided with fixed assembly 5 and protection assembly 6, fixed assembly 5 includes: fixed platform 56, fixed block 579, clamping block 5701, cavity 570, gear 572, protection assembly 6 includes: linkage 60, abutting lever 61, round plate 62, spring two 63, connecting groove 64, limiting groove 65, fixed column 66, movable slot 67, movable block 68, spring three 69, one end of linkage 60 is hinged in the surface of clamping block 5701, the end of linkage 60 away from clamping block 5701 is hinged with abutting lever 61, and abutting lever 61 is slidably connected in the surface of fixed block 579, the end of abutting lever 61 away from linkage 60 penetrates fixed platform 56, the inner wall of cavity 570 is rotatably connected with round plate 62, round plate 62 is fixed with spring two 63 on the side away from abutting lever 61, the end of spring two 63 away from round plate 62 is fixed on the inner wall of cavity 570, the surface of gear 572 is provided with connecting groove 64, the inner wall of connecting groove 64 is provided with limiting groove 65, round plate 62 is fixed with fixed column 66 on the side away from abutting lever 61, the surface of fixed column 66 is provided with movable slot 67, the inner wall of movable slot 67 is slidably connected with movable block 68, the surface of movable block 68 is fixed with spring three 69, the end of spring three 69 away from movable block 68 is fixed on the inner wall of movable slot 67, and the two ends of movable block 68 away from spring three 69 are provided with inclined plane one on the side, the side of movable block 68 away from spring three 69 is provided with inclined plane two, linkage 60 is reversed and drives abutting lever 61 to move close to round plate 62, the surface of abutting lever 61 is in abutment with the surface of round plate 62, round plate 62 drives fixed column 66 to move close to gear 572, fixed column 66 enters connecting groove 64, and movable block 68 enters limiting groove 65, and the inner wall of limiting groove 65 is in abutment with the side away from inclined plane two of movable block 68, so that gear 572 can be limited, at this moment, gear ring 571 and rack 573 cannot continue to move, so that fixed rod 578 and fixed block 579 cannot continue to move, so that the force of clamping can be avoided without timely stopping rotating knob 575, guide wheel deformation or damage occurs.

[0030] The fixed assembly 5 comprises a groove 50 formed in the surface of the workbench 1, the inner wall of the groove 50 is rotationally connected with a screw rod 51, the screw rod 51 penetrates a threaded block 52, the screw rod 51 is threadedly connected with the threaded block 52, the threaded block 52 is slidingly connected on the inner wall of the groove 50, the surface of the workbench 1 is fixedly connected with a motor 53, the output shaft of the motor 53 penetrates the workbench 1, and the output shaft of the motor 53 is fixed on the surface of the screw rod 51, the top of the threaded block 52 is fixedly connected with a moving plate 54, the moving plate 54 is slidingly connected on the top of the workbench 1, the side of the moving plate 54 close to the center of the workbench 1 is rotationally connected with a rotating plate 55, the side of the rotating plate 55 away from the moving plate 54 is fixedly connected with a fixed table 56, the side of the moving plate 54 away from the rotating plate 55 is fixedly connected with a motor 58, the output shaft of the motor 58 penetrates the moving plate 54, and the output shaft of the motor 58 is fixed on the surface of the rotating plate 55, the fixed assembly 5 further comprises a limiting piece 57, the screw rod 51 is provided with threads on two opposite ends, the motor 53 is started to rotate in the positive direction, the screw rod 51 drives the threaded block 52 to move close to each other, so that the moving plate 54 is synchronously moved, the guide wheels are abutted to each other, the motor 58 is started, the rotating plate 55 drives the fixed table 56 and the guide wheels to rotate, so that the welding work at different angles can be carried out.

[0031] The limiting piece 57 comprises a cavity 570 which is formed in the interior of the fixing table 56, the inner wall of the cavity 570 is rotationally connected with a tooth ring 571, the inner wall of the cavity 570 is rotationally connected with a gear 572, the gear 572 is engaged with the tooth ring 571, the interior of the cavity 570 is provided with a rack 573, the rack 573 penetrates through the fixing table 56 and is slidingly connected with the fixing table 56, the rack 573 is engaged with the gear 572, the surface of the rotating plate 55 is fixedly connected with a fixing plate 574, the rack 573 and the gear 572 are provided in three groups, and the three groups of rack 573 and gear 572 are circumferentially arranged with the center of the fixing table 56 as the axis, the surface of the fixing plate 574 is rotationally connected with a knob 575, the output shaft of the knob 575 penetrates through the fixing plate 574, the side, away from the knob 575, of the fixing plate 574 is rotationally connected with a screw rod two 576, the surface of one of the three groups of rack 573 is formed with a threaded groove 577, the screw rod two 576 is threadedly connected with the threaded groove 577, the surface of the rack 573 is fixedly connected with a fixing rod 578, one end of the fixing rod 578, away from the rack 573, penetrates through the circular plate 62 and the fixing table 56, the end of the fixing rod 578, away from the rack 573, is fixedly connected with a fixing block 579, the fixing block 579 is slidingly connected with the surface of the fixing table 56, the surface of the fixing block 579 is formed with a sliding groove 5700, the inner wall of the sliding groove 5700 is slidingly connected with a clamping block 5701, the surface of the clamping block 5701 is fixedly connected with a spring one 5702, one end of the spring one 5702, away from the clamping block 5701, is fixedly connected with the inner wall of the sliding groove 5700, the knob 575 is rotated in the forward direction, the screw rod two 576 drives the rack 573 to move close to the center of the fixing table 56, at this time, the gear 572 drives the tooth ring 571 to rotate, so that the rack 573 is synchronously radially moved, and the fixing rod 578, the fixing block 579 and the clamping block 5701 are synchronously moved, so that the clamping block 5701 clamps and fixes the guide wheel.

[0032] The top of the workbench 1 is fixedly connected with a support frame 2, the top of the support frame 2 is fixedly connected with a gas cylinder 3, the output end of the gas cylinder 3 penetrates through the support frame 2, the bottom of the output end of the gas cylinder 3 is fixedly connected with a welding head 4, the gas cylinder 3 is opened, the welding head 4 is lowered, and welding work can be performed.

[0033] When the guide wheel needs to be welded in the group, the guide wheel is placed on the surface of the fixed table 56, at this time the rotating knob 575 is turned, the screw rod two 576 drives the rack 573 to move close to the center of the fixed table 56, at this time the gear 572 drives the gear ring 571 to rotate, that is, the synchronous radial movement of each rack 573 can be realized, that is, the synchronous movement of the fixed rod 578, the fixed block 579 and the clamping block 5701 can be realized, so that the clamping block 5701 clamps and fixes the guide wheel, and the rotating knob 575 is continuously rotated, at this time the clamping block 5701 moves into the sliding groove 5700, and the spring one 5702 is compressed, at this time the connecting rod 60 is turned over to drive the abutting rod 61 to move close to the circular plate 62, at this time the surface of the abutting rod 61 abuts against the surface of the circular plate 62, that is, the circular plate 62 drives the fixed column 66 to move close to the gear 572, and the spring two 63 is compressed at the same time, at this time the fixed column 66 enters the connecting groove 64, the inclined surface one of the movable block 68 abuts against the inner wall of the connecting groove 64, that is, the movable block 68 moves into the movable groove 67, and the spring three 69 is compressed, when the position of the movable block 68 is parallel to the limiting groove 65, the spring three 69 is released, that is, the movable block 68 enters the limiting groove 65, at this time the inner wall of the limiting groove 65 abuts against the side of the movable block 68 away from the inclined surface two, that is, the gear 572 is limited, at this time the gear ring 571 and the rack 573 cannot continue to move, that is, the fixed rod 578 and the fixed block 579 cannot continue to move, that is, the guide wheel is prevented from being deformed or damaged due to the excessive clamping force caused by the failure to stop rotating the rotating knob 575 in time, at this time the motor one 53 is started in the forward direction, the screw rod one 51 drives the threaded block 52 to move close to each other, that is, the moving plate 54 moves synchronously, so that the guide wheels are close to each other, at this time the cylinder 3 is started, the welding head 4 moves downward, that is, the welding work is carried out, at the same time, the motor two 58 is started, the rotating plate 55 drives the fixed table 56 and the guide wheels to rotate, that is, the welding work at different angles is carried out, when the welding is completed, the rotating knob 575 is reversed, at this time the racks 573 move away from each other, at this time the gear 572 is reversed, the inner wall of the limiting groove 65 abuts against the inclined surface two, that is, the movable block 68 moves into the movable groove 67, which does not affect the normal reverse rotation of the gear 572, that is, the clamping block 5701 releases the guide wheel, the spring one 5702 and the spring two 63 are released and reset, that is, the clamping block 5701 and the circular plate 62 are reset, at the same time, the motor one 53 is reversed, that is, the moving plate 54 moves away from each other, which is convenient for personnel to take out.

[0034] The above is a detailed description of the general utility model, but some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit of the utility model are within the protection scope of the utility model.

Claims

1. A device for guiding pairs of wheels, comprising a worktable (1), characterized in that: The surface of the workbench (1) is provided with a fixing assembly (5) and a protection assembly (6), the fixing assembly (5) comprises: a fixing table (56), a fixing block (579), a clamping block (5701), a cavity (570), a gear (572); The protection assembly (6) comprises: A connecting rod (60) is used to drive the contact rod (61) to move; The contact rod (61) is used to contact the circular plate (62) to move; The circular plate (62) is used to drive the fixed column (66) to move synchronously.

2. A pair of guide wheel assembly according to claim 1, wherein: One end of the connecting rod (60) is hinged to the surface of the clamping block (5701), one end of the connecting rod (60) away from the clamping block (5701) is hinged with the contact rod (61), the contact rod (61) is slidingly connected to the surface of the fixing block (579), one end of the contact rod (61) away from the connecting rod (60) penetrates the fixing table (56), the inner wall of the cavity (570) is rotatably connected with the circular plate (62), one side of the circular plate (62) away from the contact rod (61) is fixed with a spring two (63), one end of the spring two (63) away from the circular plate (62) is fixed on the inner wall of the cavity (570), the surface of the gear (572) is provided with a connecting groove (64), the inner wall of the connecting groove (64) is provided with a limiting groove (65), one side of the circular plate (62) away from the contact rod (61) is fixed with a fixed column (66), the surface of the fixed column (66) is provided with a movable groove (67), the inner wall of the movable groove (67) is slidingly connected with a movable block (68), the surface of the movable block (68) is fixed with a spring three (69), one end of the spring three (69) away from the movable block (68) is fixed on the inner wall of the movable groove (67).

3. A pair of guide wheel assembly according to claim 2, wherein: The fixing assembly (5) comprises a groove (50) which is arranged on the surface of the workbench (1), the inner wall of the groove (50) is rotatably connected with a screw rod one (51), the screw rod one (51) penetrates a threaded block (52), the screw rod one (51) is threadedly connected with the threaded block (52), the threaded block (52) is slidingly connected with the inner wall of the groove (50), the surface of the workbench (1) is fixed with a motor one (53), the output shaft of the motor one (53) penetrates the workbench (1), and the output shaft of the motor one (53) is fixed on the surface of the screw rod one (51), the top of the threaded block (52) is fixed with a moving plate (54), the moving plate (54) is slidingly connected with the top of the workbench (1), one side of the moving plate (54) close to the center of the workbench (1) is rotatably connected with a rotating plate (55), one side of the rotating plate (55) away from the moving plate (54) is fixed with the fixing table (56), one side of the moving plate (54) away from the rotating plate (55) is fixed with a motor two (58), the output shaft of the motor two (58) penetrates the moving plate (54), and the output shaft of the motor two (58) is fixed on the surface of the rotating plate (55), the fixing assembly (5) further comprises a limiting piece (57).

4. A pair of guide wheel assembly according to claim 3, wherein: The limiting piece (57) includes a cavity (570) which is arranged in the interior of the fixed table (56), the inner wall of the cavity (570) is rotationally connected with a gear ring (571), the inner wall of the cavity (570) is rotationally connected with a gear (572), the gear (572) is engaged with the gear ring (571), the interior of the cavity (570) is provided with a rack (573), the rack (573) penetrates the fixed table (56), and the rack (573) is slidably connected with the fixed table (56), the rack (573) is engaged with the gear (572), the surface of the rotating plate (55) is fixedly connected with a fixed plate (574), the rack (573) and the gear (572) are provided with three groups, and the three groups of rack (573) and gear (572) are circumferentially arranged with the center of the fixed table (56) as the shaft, the surface of the fixed plate (574) is rotationally connected with a knob (575), the output shaft of the knob (575) penetrates the fixed plate (574), the side, away from the knob (575), of the fixed plate (574) is rotationally connected with a screw rod two (576), the surface of one of the three groups of rack (573) is provided with a threaded groove (577), the screw rod two (576) is threadedly connected with the threaded groove (577), the surface of the rack (573) is fixedly connected with a fixed rod (578), one end, away from the rack (573), of the fixed rod (578) penetrates the circular plate (62) and the fixed table (56), one end, away from the rack (573), of the fixed rod (578) is fixedly connected with a fixed block (579), the fixed block (579) is slidably connected with the surface of the fixed table (56), the surface of the fixed block (579) is provided with a sliding groove (5700), the inner wall of the sliding groove (5700) is slidably connected with a clamping block (5701), the surface of the clamping block (5701) is fixedly connected with a spring one (5702), one end, away from the clamping block (5701), of the spring one (5702) is fixedly connected with the inner wall of the sliding groove (5700).

5. A pair of guide wheel assembly according to claim 3, wherein: The screw rod one (51) is provided with threads at two opposite ends.

6. A pair of guide wheel assembly according to claim 2, wherein: The movable block (68) is provided with inclined surfaces one at two ends, away from the spring three (69), and inclined surfaces two on one side, away from the spring three (69).

7. The device of claim 1, wherein: The top of the workbench (1) is fixedly connected with a support frame (2), the top of the support frame (2) is fixedly connected with a gas cylinder (3), the output end of the gas cylinder (3) penetrates the support frame (2), and the bottom of the output end of the gas cylinder (3) is fixedly connected with a welding head (4).

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