A working platform for steel structure bridge welding construction

Abstract

The application provides a kind of working platform for steel structure bridge welding construction, relating to steel structure welding technical field, and the working platform body includes support seat, drive assembly, clamp and heat dissipation assembly, the bottom of support seat is welded with auxiliary fixing assembly, the top of auxiliary fixing assembly is welded with fixed seat, the bottom of fixed seat is installed with extrusion mechanism, the top of extrusion mechanism is installed with extrusion plate, the surface of support seat is welded with fixed motor seat, drive assembly is installed in the middle of fixed motor seat, the surface of support seat is provided with sliding groove.The working platform for steel structure bridge welding construction can be used for close-range blowing and heat dissipation treatment when welding workpieces by controlling the lifting movement of heat dissipation assembly, improving the heat dissipation effect, and the discharging process can be completed by directly pulling the rear end clamping plate during subsequent discharging, considering the stability during two-stage welding and the efficiency during discharging, and the welding is more comprehensive.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure welding, in particular to a working platform for steel structure bridge welding construction. BACKGROUND

[0002] Steel structure is a structure composed of steel materials, and is one of the main building structure types. The existing steel structure bridge structure components are usually produced in a factory and then transported to a construction site for assembly, and thus an operation platform is needed to weld and assemble the steel materials. According to the patent document with the publication number CN218193374U, a working device for steel structure bridge welding construction is disclosed, which includes a workbench, the upper surface of the workbench is provided with two position corresponding through holes, the inner wall of the through hole is rotationally connected with a rotating column through a bearing, the top end of the rotating column is fixedly connected with a movable base plate, the upper surface of the movable base plate is fixedly connected with two position corresponding limiting baffle plates, and the surface of the two limiting baffle plates is provided with position corresponding placing grooves.

[0003] According to the above content, the existing technology uses a driving servo motor to drive two movable base plates to rotate, thereby driving the steel materials on the surface of the limiting baffle plate to adjust the welding angle, so as to facilitate the welding of two steels at different angles. For the above technical solution, although the welding at different angles is realized, the welding point cannot be inwardly extruded for limiting during welding, and in addition, the steel structure is not convenient for whole circle welding, and there is inconvenience in use. At the same time, high temperature and sparks will be generated during the welding process, which has certain risks, and the work platform area of the conventional work platform clamps and fixes the workpiece, which leads to complicated operation steps during unloading. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application aims to provide a working platform for steel structure bridge welding construction to solve the problems raised in the background art. The present application can perform heat dissipation at close range, improve the heat dissipation effect, has higher installation stability, and can quickly discharge materials.

[0005] In order to achieve the above object, the application is realized by the following technical scheme: a working platform for steel structure bridge welding construction, comprising a working platform body, the working platform body comprises a support seat, a driving assembly, a clamp and a heat dissipation assembly, the bottom of the support seat is welded with an auxiliary fixing assembly, the top of the auxiliary fixing assembly is welded with a fixing seat, the bottom of the fixing seat is installed with an extrusion mechanism, the top of the extrusion mechanism is installed with an extrusion plate, the surface of the support seat is welded with a fixed motor seat, the driving assembly is installed in the middle of the fixed motor seat, the surface of the support seat is provided with a sliding groove, the inside of the sliding groove is inserted with a sliding plate, the end of the driving assembly abuts against the surface of the sliding plate, the clamp is installed between the sliding plate and the fixed motor seat, and the clamp comprises a first clamp and a second clamp, the rear end of the support seat is inserted with the heat dissipation assembly, the surface of the heat dissipation assembly is attached to the surface of the support seat, and the central axes of the fixed motor seat and the sliding plate coincide.

[0006] Further, the driving assembly comprises a servo motor, a driving shaft, a first rotating seat and a second rotating seat, the second rotating seat is connected with a second electric telescopic rod between the first rotating seat and the second rotating seat, and the surface of the second rotating seat is embedded with a linkage column.

[0007] Further, the end of the linkage column is embedded into the inside of the sliding plate, the second rotating seat pulls the sliding plate to move in translation through the linkage column, the side edge of the sliding plate is integrally formed with a sliding block, the side edge of the sliding block is integrally formed with a limiting block, a limiting groove is formed in the inner wall of the sliding groove, the sliding block is embedded into the inside of the sliding groove, and the limiting block is embedded into the inside of the limiting groove.

[0008] Further, the number of the second electric telescopic rods is two, the shell part of the servo motor is screwed on the surface of the fixed motor seat, and the driving shaft passes through the middle of the fixed motor seat and is connected with the middle of the first rotating seat through a key.

[0009] Further, the first clamp and the second clamp each comprise a mounting seat, a front end clamping plate and a rear end clamping plate, the surface of the mounting seat is provided with a strip-shaped hole and a groove, one end of the mounting seat is provided with a second butt joint hole, the surface of the rear end clamping plate is provided with a first butt joint hole, and the side edge of the mounting seat of the first clamp is provided with a second air blowing hole.

[0010] Further, the inside of each strip-shaped hole is inserted with a lead screw, the end of the lead screw is integrally formed with a knob, the side edge of the mounting seat of the first clamp is further provided with a positioning hole, the side edge of the mounting seat of the second clamp is welded with a positioning column, the end of the positioning column is embedded into the inside of the positioning hole, the first clamp is welded and fixed on the surface of the first rotating seat, and the second clamp is welded and fixed on the surface of the second rotating seat.

[0011] Further, the inside of the groove is inserted with a spring rod, the bottom of the front end clamping plate is integrally formed with a front end inserting plate, the lead screw passes through the middle of the front end inserting plate, the bottom of the rear end clamping plate is integrally formed with a rear end inserting plate, the rear end inserting plate is embedded into the inside of the groove, and the surface of the rear end inserting plate is provided with a guide hole, the guide hole is sleeved on the surface of the spring rod, and the side edge of the rear end clamping plate is provided with a first air blowing hole.

[0012] Further, the heat dissipation assembly comprises a movable box, a first baffle and an abutting plate, the bottom of the movable box is provided with a mounting groove, the inside of the mounting groove is inserted with a first electric telescopic rod, the surface of the movable box is provided with an air outlet, the surface of the support seat is welded with a first baffle, a second baffle and an abutting plate, and the inside of the second baffle is provided with a first air feeding hole.

[0013] Further, the second baffle is communicated with the inside of the rear end clamping plate through the first air feeding hole, the inside of the abutting plate is provided with a second air feeding hole, and the abutting plate is connected with the second part of the connecting hole through the second air feeding hole.

[0014] Further, the first electric telescopic rod is used for pushing the movable box to move up and down, the inside of the movable box is screwed with a blower, and the inside of the movable box is respectively aligned with the inside of the first baffle or the abutting plate through the air outlet.

[0015] The beneficial effects of the present application are as follows:

[0016] 1. The working platform for steel structure bridge welding construction is used to install the steel structure between the rear end clamping plate and the front end clamping plate, the driving assembly drives the mounting seat to move inward to press and align the two ends of the steel structure, the upper half of the welding is completed first, then the servo motor is started to drive the rotating seat to rotate, the bottom of the workpiece rotating seat is moved out, and the other half of the welding is carried out, so that the overall welding of the steel structure is realized.

[0017] 2. After the steel structure of the working platform for steel structure bridge welding construction is moved to the top of the fixed seat, the extrusion mechanism is started to push the extrusion plate to contact the workpiece, the extrusion plate and the rear end clamping plate are distributed in a staggered manner, the extrusion plate and the rear end clamping plate cooperate to realize multi-point support and fixation of the steel structure, and one end of the extrusion mechanism is in contact with the ground, the extrusion mechanism cooperates with the support seat to provide parallel support force for the whole equipment.

[0018] 3. The working platform for steel structure bridge welding construction can realize close blowing and heat dissipation treatment during welding of the workpiece by controlling the lifting movement of the heat dissipation assembly, thereby improving the heat dissipation effect, and the discharging process can be completed by directly pulling the rear end clamping plate during subsequent discharging, which takes into account the stability during two-stage welding and the efficiency during discharging. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the structure diagram of the shape of the working platform for the steel structure bridge welding construction of the application;

[0020] Figure 2 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0021] Figure 3 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0022] Figure 4 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0023] Figure 5 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0024] Figure 6 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0025] Figure 7 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0026] Figure 8 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp; Figure 2

[0027] Figure 9 It is the structure diagram of the working platform for the steel structure bridge welding construction of the application after the dismantling clamp;

[0028] Figure: 1, support seat; 2, drive assembly; 3, first clamp; 4, second clamp; 5, auxiliary fixing assembly; 6, heat dissipation assembly; 7, fixed motor base; 8, drive shaft; 9, servo motor; 10, sliding groove; 11, limiting groove; 12, sliding plate; 13, linkage column; 14, sliding block; 15, limiting block; 16, screw rod; 17, knob; 18, positioning column; 19, mounting seat; 20, strip-shaped hole; 21, groove; 22, spring rod; 23, front end clamping plate; 24, front end plug-in plate; 25, second butt joint hole; 26, second air blowing hole; 27, positioning hole; 28, rear end clamping plate; 29, rear end plug-in plate; 30, guide hole; 31, first butt joint hole; 32, first air blowing hole; 33, first electric telescopic rod; 34, second electric telescopic rod; 35, mounting groove; 36, movable box; 37, air outlet; 38, first baffle; 39, first air supply hole; 40, second baffle; 41, top abutting plate; 42, second air supply hole; 43, workpiece; 44, second rotating seat; 45, fixed seat; 46, extrusion mechanism; 47, extrusion plate; 48, first rotating seat. DETAILED DESCRIPTION

[0029] ​In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in conjunction with specific embodiments.

[0030] Please refer to Figures 1 to 9 The present application provides the following technical solutions: a working platform for steel structure bridge welding construction, comprising a working platform body, the working platform body comprising a support seat 1, a driving assembly 2, a clamp and a heat dissipation assembly 6, an auxiliary fixing assembly 5 is welded at the bottom of the support seat 1, a fixing seat 45 is welded at the top end of the auxiliary fixing assembly 5, an extrusion mechanism 46 is installed at the bottom of the fixing seat 45, an extrusion plate 47 is installed at the top of the extrusion mechanism 46, a fixed motor seat 7 is welded on the surface of the support seat 1, the driving assembly 2 is installed in the middle of the fixed motor seat 7, a sliding groove 10 is formed on the surface of the support seat 1, a sliding plate 12 is inserted into the sliding groove 10, the end of the driving assembly 2 abuts against the surface of the sliding plate 12, the clamp is installed between the sliding plate 12 and the fixed motor seat 7, and the clamp comprises a first clamp 3 and a second clamp 4, the heat dissipation assembly 6 is inserted into the rear end of the support seat 1, the surface of the heat dissipation assembly 6 is attached to the surface of the support seat 1, and the central axes of the fixed motor seat 7 and the sliding plate 12 coincide. The working platform for steel structure bridge welding construction is used for welding processing of two workpieces 43.

[0031] When the present application is used, first, the knob 17 drives the screw rod 16 to rotate, the screw rod 16 drives the front end plug-in plate 24 to move in the inside of the strip-shaped hole 20 in the rotating state, the front end plug-in plate 24 drives the front end clamping plate 23 to move to one end of the strip-shaped hole 20, the workpiece 43 is placed on one side of the front end clamping plate 23, and then the knob 17 rotates the screw rod 16, the screw rod 16 drives the front end clamping plate 23 to push the workpiece 43 into the inside of the rear end clamping plate 28, the extrusion force of the front end clamping plate 23 realizes clamping and limiting of the workpiece 43, after the workpiece 43 is clamped and fixed, the driving assembly 2 is started to drive the two clamps to approach each other, the second rotating seat 44 moves while extruding and aligning the two ends of the workpiece 43, after alignment, the workpiece 43 is welded by the external welding equipment, while welding, the heat dissipation assembly 6 is started to push the movable box 36 to move upward, air blowing is used to quickly cool the welding position, after cooling, the strength of the welding point is increased, then the servo motor 9 is started to drive the rotating seat to rotate, the front end clamping plate 23 and the rear end clamping plate 28 limit the workpiece 43 during rotation, when the workpiece 43 rotates, the extrusion mechanism 46 is started, the extrusion mechanism 46 pushes the extrusion plate 47 to contact the workpiece 43, the extrusion plate 47 pushes the workpiece 43 to move upward, so that one side of the workpiece 43 contacts the mounting seat 19, then the welding equipment is used to weld the position without welding again from the gap between the mounting seats 19, and the heat dissipation assembly 6 still provides close-range heat dissipation treatment during the welding process.

[0032] The driving assembly 2 comprises a servo motor 9, a driving shaft 8, a first rotating base 48 and a second rotating base 44, the second electric telescopic rod 34 is connected between the first rotating base 48 and the second rotating base 44, and the surface of the second rotating base 44 is embedded with the linkage column 13. The end of the linkage column 13 is embedded into the inside of the sliding plate 12, the second rotating base 44 pulls the sliding plate 12 to move in translation through the linkage column 13, the side edge of the sliding plate 12 is integrally formed with the sliding block 14, the side edge of the sliding block 14 is integrally formed with the limiting block 15, the inner wall of the sliding groove 10 is provided with the limiting groove 11, the sliding block 14 is embedded into the inside of the sliding groove 10, and the limiting block 15 is embedded into the inside of the limiting groove 11. The number of the second electric telescopic rod 34 is two, the shell part of the servo motor 9 is screwed on the surface of the fixed motor base 7, and the driving shaft 8 passes through the middle of the fixed motor base 7 and is connected with the middle of the first rotating base 48 through a key.

[0033] Specifically, after the workpiece 43 is clamped by the first clamp 3 and the second clamp 4, the second electric telescopic rod 34 is started, the second rotating base 44 at the end is pulled to be close to the position of the first rotating base 48 through the contraction effect of the second electric telescopic rod 34, the external sliding plate 12 and the first clamp 3 part are synchronously driven to be close to the position of the second clamp 4 in the process, the two workpieces 43 on the first clamp 3 and the second clamp 4 are top-contacted and a large extrusion force is generated, and finally the upper half circular area of the contact position of the two workpieces 43 is welded from the top under the extrusion effect.

[0034] The first clamp 3 and the second clamp 4 each include a mounting seat 19, a front end clamping plate 23 and a rear end clamping plate 28. The surface of the mounting seat 19 is provided with a strip-shaped hole 20 and a groove 21. One end of the mounting seat 19 is provided with a second butt joint hole 25. The surface of the rear end clamping plate 28 is provided with a first butt joint hole 31. The side of the mounting seat 19 of the first clamp 3 is provided with a second air blowing hole 26. The inside of each strip-shaped hole 20 is inserted with a lead screw 16. The end of the lead screw 16 is integrally formed with a knob 17. The side of the mounting seat 19 of the first clamp 3 is also provided with a positioning hole 27. The side of the mounting seat 19 of the second clamp 4 is welded with a positioning column 18. The end of the positioning column 18 is embedded into the inside of the positioning hole 27. The first clamp 3 is welded and fixed on the surface of a first rotating seat 48. The second clamp 4 is welded and fixed on the surface of a second rotating seat 44. The inside of the groove 21 is inserted with a spring rod 22. The bottom of the front end clamping plate 23 is integrally formed with a front end plug-in plate 24. The lead screw 16 passes through the middle of the front end plug-in plate 24. The bottom of the rear end clamping plate 28 is integrally formed with a rear end plug-in plate 29. The rear end plug-in plate 29 is embedded into the inside of the groove 21. The surface of the rear end plug-in plate 29 is provided with a guide hole 30. The guide hole 30 is sleeved on the surface of the spring rod 22. The side of the rear end clamping plate 28 is provided with a first air blowing hole 32.

[0035] Specifically, when clamping, directly rotating the knob 17 can push the front end clamping plate 23 and the rear end clamping plate 28 to approach, realizing the clamping effect on the workpiece 43. In the first stage of the welding process, the rear end first plate 38 and the rear end second plate 40 will abut against the rear of the two rear end clamping plates 28 respectively. This structure can ensure that the rear end clamping plate 28 can remain stationary after being pushed by the front end clamping plate 23 cooperating with the workpiece 43, thereby ensuring that pressure is applied to the workpiece 43. At the same time, in this state, the rear end clamping plate 28 on the first clamp 3 is connected to the first air blowing hole 39 at the first butt joint hole 31 and the first plate 38 in the rear, so that the heat dissipation assembly 6 can directly blow air from the first air blowing hole 32 to the welding area, realizing the cooling effect.

[0036] The heat dissipation assembly 6 includes the movable box 36, the first baffle 38 and the abutting plate 41, the bottom of the movable box 36 is provided with a mounting groove 35, the first electric telescopic rod 33 is inserted into the mounting groove 35, the surface of the movable box 36 is provided with an air outlet 37, the surface of the support base 1 is welded with the first baffle 38, the second baffle 40 and the abutting plate 41, the inside of the second baffle 40 is provided with a first air supply hole 39, the second baffle 40 is communicated with the inside of the rear end clamping plate 28 through the first air supply hole 39, the inside of the abutting plate 41 is provided with a second air supply hole 42, and the abutting plate 41 is connected with the second butt joint hole 25 through the second air supply hole 42. The first electric telescopic rod 33 is used for driving the movable box 36 to move up and down, the inside of the movable box 36 is screwed with a blower, and the inside of the movable box 36 is aligned with the inside of the first baffle 38 or the abutting plate 41 through the air outlet 37. By controlling the lifting movement of the heat dissipation assembly 6, the above-mentioned close-range air blowing and heat dissipation treatment during welding of the workpiece 43 can be realized, and the heat dissipation effect is improved. When the workpiece 43 is discharged, the rear end clamping plate 28 is directly pulled to complete the discharging process, and the stability during welding and the efficiency during discharging are considered.

[0037] Specifically, when the welding of the upper semicircular part of the workpiece 43 is completed, the workpiece 43 is rotated to the bottom by the driving assembly 2, at this time, the first baffle 38 and the second baffle 40 no longer limit the rear end clamping plate 28, but the workpiece 43 still has a certain clamping force by the spring rod 22, and the workpiece 43 is always blocked by the rear end clamping plate 28 and the bottom of the front end clamping plate 23, so that the workpiece 43 cannot fall off until the whole clamp is turned over. After turning over, the workpiece 43 is fixed again by the auxiliary fixing assembly 5, the mounting seat 19 on the first clamp 3 is connected with the second air supply hole 42 through the second butt joint hole 25, the air outlet 37 on the movable box 36 is aligned with the rear end of the abutting plate 41 by controlling the first electric telescopic rod 33, and the air flow is directly sent to the second air blowing hole 26 from the second air supply hole 42, so that the close-range cooling and blowing effect of the workpiece 43 is realized. After welding, the workpiece 43 is taken out by pulling the rear end clamping plate 28.

[0038] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. It is obvious for those skilled in the art that the present application is not limited to the details of the above-mentioned exemplary embodiments, and the present application can be realized in other specific forms without departing from the spirit or basic characteristics of the present application.

[0039] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A working platform for steel structure bridge welding construction, comprising a working platform body, characterized in that: The working platform body includes a support base (1), a driving assembly (2), a clamp and a heat dissipation assembly (6), the bottom of the support base (1) is welded with an auxiliary fixing assembly (5), the top of the auxiliary fixing assembly (5) is welded with a fixing seat (45), the bottom of the fixing seat (45) is installed with an extrusion mechanism (46), the top of the extrusion mechanism (46) is installed with an extrusion plate (47), the surface of the support base (1) is welded with a fixed motor seat (7), the driving assembly (2) is installed in the middle of the fixed motor seat (7), the surface of the support base (1) is provided with a sliding groove (10), the inside of the sliding groove (10) is inserted with a sliding plate (12), the end of the driving assembly (2) abuts against the surface of the sliding plate (12), the clamp is installed between the sliding plate (12) and the fixed motor seat (7), and the clamp includes a first clamp (3) and a second clamp (4), the rear end of the support base (1) is inserted with the heat dissipation assembly (6), the surface of the heat dissipation assembly (6) is attached to the surface of the support base (1), the central axes of the fixed motor seat (7) and the sliding plate (12) coincide, the first clamp (3) and the second clamp (4) each include a mounting seat (19), a front end clamping plate (23) and a rear end clamping plate (28), the surface of the mounting seat (19) is provided with a strip-shaped hole (20) and a groove (21), one end of the mounting seat (19) is provided with a second butt joint hole (25), the surface of the rear end clamping plate (28) is provided with a first butt joint hole (31), the side of the mounting seat (19) of the first clamp (3) is provided with a second air blowing hole (26), the side of the rear end clamping plate (28) is provided with a first air blowing hole (32), the heat dissipation assembly (6) includes a movable box (36), a first baffle (38) and an abutting plate (41), the bottom of the movable box (36) is provided with a mounting groove (35), the inside of the mounting groove (35) is inserted with a first electric telescopic rod (33), the surface of the movable box (36) is provided with an air outlet (37), the surface of the support base (1) is welded with the first baffle (38), a second baffle (40) and the abutting plate (41), the inside of the second baffle (40) is provided with a first air feeding hole (39), the inside of the second baffle (40) is communicated with the inside of the rear end clamping plate (28) through the first air feeding hole (39), the inside of the abutting plate (41) is provided with a second air feeding hole (42), and the abutting plate (41) is connected with the second butt joint hole (25) through the second air feeding hole (42), the first electric telescopic rod (33) is used for driving the movable box (36) to move up and down, a blower fan is screwed in the inside of the movable box (36), and the inside of the movable box (36) is respectively aligned with the inside of the first baffle (38) or the abutting plate (41) through the air outlet (37).

2. The working platform for the steel structure bridge welding construction according to claim 1, characterized in that: The driving assembly (2) comprises a servo motor (9), a driving shaft (8), a first rotating base (48) and a second rotating base (44), the first rotating base (48) and the second rotating base (44) are connected with a second electric telescopic rod (34), and the surface of the second rotating base (44) is embedded with a linkage column (13).

3. The working platform for the steel structure bridge welding construction according to claim 2, characterized in that: The end of the linkage column (13) is embedded into the inside of a sliding plate (12), the second rotating base (44) pulls the sliding plate (12) to move in translation through the linkage column (13), the side of the sliding plate (12) is integrally formed with a sliding block (14), the side of the sliding block (14) is integrally formed with a limiting block (15), the inner wall of a sliding groove (10) is provided with a limiting groove (11), the sliding block (14) is embedded into the inside of the sliding groove (10), and the limiting block (15) is embedded into the inside of the limiting groove (11).

4. The working platform for the steel structure bridge welding construction according to claim 3, characterized in that: The number of the second electric telescopic rod (34) is two, the shell part of the servo motor (9) is screwed on the surface of a fixed motor base (7), and the driving shaft (8) passes through the middle of the fixed motor base (7) and is connected with the middle of the first rotating base (48) through a key.

5. The working platform for the steel structure bridge welding construction according to claim 4, characterized in that: The inside of each of the strip-shaped holes (20) is inserted with a lead screw (16), the end of the lead screw (16) is integrally formed with a knob (17), the side of the mounting seat (19) of the first clamp (3) is also provided with a positioning hole (27), the side of the mounting seat (19) of the second clamp (4) is welded with a positioning column (18), the end of the positioning column (18) is embedded into the inside of the positioning hole (27), the first clamp (3) is welded and fixed on the surface of the first rotating base (48), and the second clamp (4) is welded and fixed on the surface of the second rotating base (44).

6. The working platform for the steel structure bridge welding construction according to claim 5, characterized in that: The inside of the groove (21) is inserted with a spring rod (22), the bottom of the front clamping plate (23) is integrally formed with a front end inserting plate (24), the lead screw (16) passes through the middle of the front end inserting plate (24), the bottom of the rear clamping plate (28) is integrally formed with a rear end inserting plate (29), the rear end inserting plate (29) is embedded into the inside of the groove (21), and the surface of the rear end inserting plate (29) is provided with a guide hole (30), and the guide hole (30) is sleeved on the surface of the spring rod (22).

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