Self-adaptive feeding mechanism of bent pipe spot welding machine

Abstract

The utility model relates to the technical field of coil pipe processing, in particular to a self-adaptive feeding mechanism of a bent pipe spot welding machine, which comprises a track, an X-axis sliding table, a Y-axis sliding table, a discharging frame and a pipe bending machine, an encoder is arranged at the outlet end of the pipe bending machine, the X-axis sliding table is connected with the track in a sliding manner, and the Y-axis sliding table is connected with the X-axis sliding table in a sliding manner; the discharging frame and the pipe bending machine are both arranged on the Y-axis sliding table. The X-axis sliding table comprises a base, the Y-axis sliding table comprises a sliding block plate, the upper portion of the base is in sliding connection with the lower portion of the sliding block plate, a lead screw is installed in the base, the bottom of the sliding block plate is fixedly connected with a nut block matched with the lead screw, a first motor is installed on the outer side of the base, and an output shaft of the first motor is connected with one end of the lead screw through a torque limiter. The feeding mechanism is provided with the track, the X-axis sliding table and the Y-axis sliding table, the moment limiter can adjust the tightness degree of the material belt in a self-adaptive mode, the material belt is prevented from being pulled or pulled, self-adaptive attachment of the material belt and the barrel is achieved, and the machining quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of coil processing, in particular to an adaptive feeding mechanism of a bent pipe spot welding machine. Background Art

[0002] In order to cool or heat the medium in the pressure vessel, an elbow (or coil) is usually wound and welded on the outer shell of the container. For this purpose, the existing bending process is: cutting the plate into strips, then making the strips into semicircular tubes, and then bending the straight semicircular tubes into disc semicircular tubes with the same diameter as the cylinder. Finally, the semicircular tubes are assembled on the cylinder of the container. After assembly and fixation, the annular butt joints between the tubes need to be welded first, and then the fillet welds between the elbow and the cylinder are welded after grinding.

[0003] This traditional processing method is complex and difficult to ensure uniform circumferential butt joints. Furthermore, the large number of coiled elbows further complicates welding, increasing weld leakage and significantly impacting the overall aesthetics of the elbow. To address this issue, the present application provides an adaptive feeding mechanism for an elbow spot welder to ensure weld conformity and improve work efficiency. Utility Model Content

[0004] The utility model aims to provide an adaptive feeding mechanism for a bent pipe spot welding machine, which is used to solve the problems of inconsistent welds and low working efficiency.

[0005] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: an adaptive feeding mechanism of a pipe bending spot welding machine, comprising a track, an X-axis slide and a Y-axis slide, and also comprising a discharge rack and a pipe bender, the outlet end of the pipe bender is provided with an encoder, the X-axis slide is slidably connected to the track, and the Y-axis slide is slidably connected to the X-axis slide; the discharge rack and the pipe bender are both arranged on the Y-axis slide; the X-axis slide comprises a base, and the Y-axis slide comprises a slider plate, the upper part of the base is slidably connected to the lower part of the slider plate, a screw rod is installed in the base, and the bottom of the slider plate is fixedly connected to a nut block adapted to the screw rod, a first motor is installed on the outside of the base, and the output shaft of the first motor is connected to one end of the screw rod through a torque limiter.

[0006] By adopting the above technical solution: the feeding mechanism has a track, an X-axis slide and a Y-axis slide, and the X-axis slide is coupled with the track and the Y-axis slide is coupled with the X-axis slide, which can drive the material rack and the pipe bending machine on the Y-axis slide to move along the length direction of the cylinder, and can adjust the distance between the cylinder and the cylinder at any time to ensure the fit between the material strip and the outer wall of the cylinder during the placement process. Furthermore, a first motor and a screw rod are provided on the base, and the screw rod can be driven to rotate by the first motor, thereby driving the slider plate to slide along the upper end surface of the base. Since the first motor and one end of the screw rod are provided A torque limiter is provided, and the encoder can be used to detect the tension of the material belt during the process of winding the material belt around the cylinder. When it is detected that the material belt is too loose, it is necessary to pull the slider plate away from the cylinder through the cooperation of the lead screw and the nut block to tighten the material belt. When it is detected that the material belt is too tight, it is necessary to push the slider plate towards the cylinder to release the tension of the material belt. In this process, the torque limiter can adaptively adjust the tightness of the material belt to avoid pulling the material belt or causing the material belt to pull, thereby achieving adaptive fitting between the material belt and the cylinder and ensuring processing quality.

[0007] The track includes a frame, which is provided with two guide rails, one of which is provided with a guide rack on the inner side, and the bottom of the base is provided with a guide assembly adapted to the guide rail. A second motor is also installed in the base, and the bottom end of the second motor is provided with a driving gear connected to the guide rack.

[0008] By adopting the above technical solution: a rack is installed on the frame, a guide assembly is connected to the base for sliding connection with the guide rail, and a second motor is also provided on the base, which is connected to the drive gear to realize the back and forth movement of the base on the guide rail.

[0009] A support plate is provided in the base, one end of the screw rod is provided at the top of the support plate through a bearing seat, and the first motor connected to the other end of the screw rod is installed on the outer wall of the base through a bracket, and a first hinge seat is provided on the side of the support plate, and the support plate is hinged to a mounting seat through the first hinge seat, and the mounting seat rotates in the radial plane of the driving gear through the first hinge seat. A guide plate is also provided at the end of the mounting seat away from the first hinge seat, and an open groove is provided on the guide plate. A guide rod is fixedly connected to the side of the support plate, and an anti-top spring is provided on the guide rod. The guide rod is inserted into the open groove from one side of the guide plate and one end of the anti-top spring is against the guide plate.

[0010] By adopting the above technical solution: the second motor is set on the mounting seat, secondly, one end of the mounting seat is hinged to the support plate through the first hinge seat, and then a guide plate is provided at the other end of the mounting seat, and the anti-top spring on the guide rod is used to press against the guide plate, so that the driving gear is pressed against the guide rack to ensure full engagement between the driving gear and the guide rack, and when the driving gear or the guide rack is worn, the anti-top spring is used to press against the guide plate to eliminate the gap caused by the wear of the driving gear and the guide rack, thereby improving the service life of the X-axis slide.

[0011] The guide assembly includes a first roller, a second roller and a third roller. The guide rail adopts an I-shaped guide rail. The first roller is installed on the inner side of the base through a guide seat and the first roller is against the top surface of the guide rail. The side of the guide seat is provided with a support seat for installing the second roller. The second roller extends into the I-shaped groove of the guide rail and forms a top contact with the first roller. The outer bottom end of the base is also provided with a fixed seat for installing the third roller. The third roller is used to vertically against the two side edges of the top of the guide rail.

[0012] By adopting the above technical solution: the guide assembly is provided with a first roller, a second roller and a third roller. Since the cross-section of the guide rail is I-shaped, the first roller is arranged to abut against the top surface of the guide rail, the second roller is arranged to extend into the I-shaped groove of the guide rail and form a top contact with the first roller, and the third roller is arranged to abut against the two side edges of the guide rail, thereby ensuring the stability of the base during the sliding process.

[0013] A slide rail is provided on the top of the base, a plurality of slider bodies are provided on the slide rail, and the bottom end surface of the slider plate is fixedly connected to the top of the slider body.

[0014] By adopting the above technical solution: the base and the slider plate cooperate with each other through the slider body and the slide rail to facilitate the movement of the Y-axis slide.

[0015] The base is connected to a sensor bracket on which a plurality of proximity switches are provided. The side of the slider plate is connected to an L-shaped plate. When the slider plate slides relative to the base, the horizontal surface of the L-shaped plate passes through the sensing end of each proximity switch.

[0016] By adopting the above technical solution: two proximity switches can be set on the sensor bracket. When the slider plate drives the L-shaped plate to move to the sensing end of the proximity switch, the relative positions of the base and the slider plate are exactly at two extreme positions. The proximity switch is used to sense the two extreme positions to ensure stable and reliable operation between the slider plate and the base.

[0017] One end of the slider plate is provided with a rotating base, a second hinge seat and a third hinge seat, one end of the rotating base is hinged to the slider plate through the second hinge seat, and a movable screw is hinged on the third hinge seat. The end of the rotating base away from the second hinge seat is connected to a limit plate, and a socket for the movable screw to pass through is provided on the limit plate, and the movable screw is located on both sides of the limit plate and is connected with a limiting bolt.

[0018] By adopting the above technical solution: the pipe bender adopts existing equipment, and the pipe bender of this solution is installed through a rotating base, one end of the rotating base is hinged to the upper end surface of the slider plate through a second hinge seat, and the other end is connected with a movable screw and a third hinge seat. The angle of the rotating base can be adjusted by the movable screw, thereby adjusting the inclination angle of the pipe bender, and then the outlet end of the pipe bender can freely adjust the distance and height relationship with the cylinder to ensure the processing effect of the bent pipe.

[0019] Technical effects and advantages of this utility model:

[0020] 1. In this solution, the feeding mechanism comprises a track, an X-axis slide, and a Y-axis slide. By coupling the X-axis slide with the track and the Y-axis slide with the X-axis slide, the unloading rack and the pipe bender on the Y-axis slide can be driven to move along the length direction of the cylinder. The distance between the unloading rack and the cylinder can be adjusted at any time to ensure that the material strip fits the outer wall of the cylinder during placement. Furthermore, a first motor and a screw are provided on the base. The first motor can drive the screw to rotate, thereby driving the slider plate to slide along the upper end surface of the base.

[0021] 2. In this solution, since a torque limiter is provided at one end of the first motor and the lead screw, the encoder can be used to detect the tension of the material belt during the process of winding the material belt around the cylinder. When it is detected that the material belt is too loose, it is necessary to pull the slider plate away from the cylinder through the cooperation of the lead screw and the nut block to tighten the material belt. When it is detected that the material belt is too tight, it is necessary to push the slider plate toward the cylinder to release the tension of the material belt. In this process, the torque limiter can adaptively adjust the tightness of the material belt to avoid pulling the material belt or causing pulling of the material belt, thereby achieving adaptive fitting of the material belt and the cylinder and ensuring processing quality.

[0022] 3. In this solution, a rack is installed on the frame, a guide assembly is connected to the base and is slidably connected to the guide rail, and a second motor is also provided on the base, which is connected to the drive gear to enable the base to move back and forth on the guide rail. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of the adaptive feeding mechanism of the elbow spot welding machine provided by the utility model;

[0024] Figure 2A three-dimensional diagram of the slide in the adaptive feeding mechanism of the bent pipe spot welding machine provided by the present invention;

[0025] Figure 3 for Figure 2 A bottom view of the adaptive feeding mechanism of the provided pipe bending spot welding machine;

[0026] Figure 4 for Figure 1 Schematic diagram of the enlarged structure at A in the middle;

[0027] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0028] Figure markings: 1. frame; 2. guide rail; 3. guide rack; 4. base; 5. slider plate; 6. unloading rack; 7. pipe bending machine; 8. encoder; 9. second hinge seat; 10. movable screw; 11. rotating base; 12. limit plate; 13. third hinge seat; 14. bracket; 15. first motor; 16. torque limiter; 17. screw rod; 18. second motor; 19. mounting seat; 20. driving gear; 21. first hinge seat; 22. guide plate; 23. guide rod; 24. anti-top spring; 25. support plate; 26. first roller; 27. second roller; 28. guide seat; 29. fixed seat; 30. third roller; 31. slide rail; 32. slider body; 33. nut block; 34. support seat. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] Example

[0031] This embodiment provides Figure 1 The adaptive feeding mechanism of the bending spot welding machine shown in the figure includes a track, an X-axis slide and a Y-axis slide, and also includes a feed rack 6 and a pipe bender 7. The outlet end of the pipe bender 7 is provided with an encoder 8. The X-axis slide is slidably connected to the track, and the Y-axis slide is slidably connected to the X-axis slide; the feed rack 6 and the pipe bender 7 are both arranged on the Y-axis slide; the X-axis slide includes a base 4, and the Y-axis slide includes a slider plate 5. Further, as shown Figure 2 and 3As shown, the upper part of the base 4 is slidably connected to the lower part of the slider plate 5, a screw rod 17 is installed in the base 4, and a nut block 33 adapted to the screw rod 17 is fixedly connected to the bottom of the slider plate 5. A first motor 15 is installed on the outside of the base 4, and the output shaft of the first motor 15 is connected to one end of the screw rod 17 through a torque limiter 16. The feeding mechanism has a track, an X-axis slide and a Y-axis slide. By coupling the X-axis slide with the track and the Y-axis slide with the X-axis slide, the material unloading rack 6 and the pipe bending machine 7 on the Y-axis slide can be driven to move along the length direction of the cylinder, and the distance between the material and the cylinder can be adjusted at any time to ensure the fit between the material strip and the outer wall of the cylinder during the placement process. Furthermore, a first motor 15 and a screw rod 17 are provided on the base 4. The screw rod 17 can be driven to rotate by the first motor 15, thereby driving the slider plate 5 to slide along the upper end surface of the base 4. Since the first motor 15 and one end of the screw rod 17 are provided with a torque limiter 16,

[0032] Normally, when the material belt is wound on the cylinder, it may be too loose or too tight. In addition, when the material belt is spirally wound, the cross-sectional size of the cylinder will change, and the material belt may be too loose or too tight. When the material belt is too loose or too tight, it is necessary to use the first motor 15 to drive the slide screw 17 to rotate, and drive the second slide to move back and forth along the slide rail 31, so as to adjust the tightness of the material belt. When the material belt is too tight, the second slide needs to move forward a distance. When it is detected that the material belt is too loose, the second slide needs to move backward. Under the action of the torque limiter 16, when the second slide reaches the appropriate position under the traction of the slide screw 17, the tension generated by the tightening of the material belt is greater than the transmission torque set by the torque limiter 16. At this time, the torque limiter 16 If slipping occurs, the slide screw 17 has a positioning function, which can make the second slide stay in the appropriate position; secondly, when the material belt is too loose, the slide screw 17 directly pulls the second slide backward for a distance until the torque limiter 16 slips; according to the characteristics of the above-mentioned torque limiter 16, when the material belt is too loose or too tight again, the torque limiter 16 can still be made to slip by adjusting the displacement of the second slide, thereby completing the adaptive adjustment of the tightness of the material belt, realizing the adaptive fit between the material belt and the cylinder, and ensuring the processing quality.

[0033] For example Figure 1 and Figure 5 As shown, the track includes a frame 1, two guide rails 2 are provided on the frame 1, a guide rack 3 is provided on the inner side of one of the guide rails 2, a guide assembly adapted to the guide rail 2 is provided at the bottom of the base 4, a second motor 18 is also installed in the base 4, and a driving gear 20 connected to the guide rack 3 is provided at the bottom end of the second motor 18. In this embodiment, a rack is installed on the frame 1, the guide assembly is connected to the base 4 and is slidably connected to the guide rail 2, and a second motor 18 is also provided on the base 4, which is connected to the driving gear 20 through the second motor 18 to realize the back and forth movement of the base 4 on the guide rail 2.

[0034] like Figure 3 As shown, a support plate 25 is provided in the base 4 of the feeding mechanism, one end of the screw rod 17 is provided at the top of the support plate 25 through a bearing seat, and the first motor 15 connected to the other end of the screw rod 17 is installed on the outer wall of the base 4 through a bracket 14, and a first hinge seat 21 is provided on the side of the support plate 25, and the support plate 25 is hinged with a mounting seat 19 through the first hinge seat 21, and the mounting seat 19 rotates in the radial plane of the driving gear 20 through the first hinge seat 21. A guide plate 22 is also provided at the end of the mounting seat 19 away from the first hinge seat 21, and an open groove is provided on the guide plate 22. A guide rod 23 is fixedly connected to the side of the support plate 25, and an anti-top spring 24 is provided on the guide rod 23. The guide rod 23 is inserted into the open groove from one side of the guide plate 22 and one end of the anti-top spring 24 is against the guide plate 22. Specifically, the second motor 18 is arranged on the mounting seat 19, one end of the mounting seat 19 is hinged to the support plate 25 through the first hinge seat 21, and a guide plate 22 is further provided at the other end of the mounting seat 19, and the anti-top spring 24 on the guide rod 23 is used to press against the guide plate 22, so that the driving gear 20 is pressed against the guide rack 3, ensuring that the driving gear 20 is fully engaged with the guide rack 3, and when the driving gear 20 or the guide rack 3 is worn, the anti-top spring 24 is used to press against the guide plate 22 to eliminate the gap caused by the wear of the driving gear 20 and the guide rack 3, thereby improving the service life of the X-axis slide.

[0035] Furthermore, the guide assembly of the feeding mechanism includes a first roller 26, a second roller 27 and a third roller 30. The guide rail 2 adopts an I-shaped guide rail 2. The first roller 26 is installed on the inner side of the base 4 through the guide seat 28 and the first roller 26 is against the top surface of the guide rail 2. The side of the guide seat 28 is provided with a support seat 34 for installing the second roller 27. The second roller 27 extends into the I-shaped groove of the guide rail 2 and forms a top with the first roller 26. The outer bottom end of the base 4 is also provided with a fixed seat 29 for installing the third roller 30. The third roller 30 is used to vertically against the two side edges of the top of the guide rail 2. The guide assembly includes a first roller 26, a second roller 27 and a third roller 30. Since the cross-section of the guide rail 2 is I-shaped, the first roller 26 is set to abut against the top surface of the guide rail 2, the second roller 27 is set to extend into the I-shaped groove of the guide rail 2 and form a top with the first roller 26, and the third roller 30 is set to abut against the two side edges of the guide rail 2, thereby ensuring the stability of the base 4 during the sliding process.

[0036] Specifically, a slide rail 31 is provided at the top of the base 4, and a plurality of slider bodies 32 are provided on the slide rail 31. The bottom end surface of the slider plate 5 is fixedly connected to the top of the slider body 32. The base 4 and the slider plate 5 cooperate with each other through the slider bodies 32 and the slide rail 31 to facilitate the movement of the Y-axis slide.

[0037] Furthermore, in this embodiment, to facilitate operation, a sensor bracket 14 is connected to the primary side of the base 4. Multiple proximity switches are mounted on the sensor bracket 14. An L-shaped plate is attached to the side of the slider plate 5. When the slider plate 5 slides relative to the base 4, the horizontal surface of the L-shaped plate passes over the sensing ends of each proximity switch. Two proximity switches can be mounted on the sensor bracket 14. When the slider plate 5 drives the L-shaped plate to the sensing ends of the proximity switches, the relative positions of the base 4 and slider plate 5 are at their respective extremes. The proximity switches sense these two extreme positions, ensuring stable and reliable operation between the slider plate 5 and the base 4.

[0038] like Figure 4 As shown, one end of the slider plate 5 is provided with a rotating base 114, a second hinge seat 9 and a third hinge seat 13. One end of the rotating base 114 is hinged to the slider plate 5 through the second hinge seat 9. A movable screw 10 is hinged on the third hinge seat 13. The end of the rotating base 114 away from the second hinge seat 9 is connected to a limiting plate 12. A socket for the movable screw 10 to pass through is provided on the limiting plate 12. The movable screw 10 is located on both sides of the limiting plate 12 and is connected to limiting bolts.

[0039] It should be added that the pipe bender 7 of the feeding mechanism adopts existing equipment. The pipe bender 7 of this scheme is installed through a rotating base 114. One end of the rotating base 114 is hinged to the upper end surface of the slider plate 5 through a second hinge seat 9, and the other end is connected with a movable screw 10 and a third hinge seat 13. The angle of the rotating base 114 can be adjusted by the movable screw 10, thereby adjusting the inclination angle of the pipe bender 7, and then the outlet end of the pipe bender 7 can freely adjust the distance and height relationship with the cylinder to ensure the processing effect of the bent pipe.

[0040] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The adaptive feeding mechanism of the pipe bending spot welding machine includes a track, an X-axis slide and a Y-axis slide, characterized in that: The invention also includes a material unloading rack (6) and a pipe bender (7), wherein an encoder (8) is provided at the outlet end of the pipe bender (7), the X-axis slide is slidably connected to the track, and the Y-axis slide is slidably connected to the X-axis slide; the material unloading rack (6) and the pipe bender (7) are both arranged on the Y-axis slide; the X-axis slide includes a base (4), and the Y-axis slide includes a slider plate (5), the upper part of the base (4) is slidably connected to the lower part of the slider plate (5), a screw rod (17) is installed in the base (4), and a nut block (33) adapted to the screw rod (17) is fixedly connected to the bottom of the slider plate (5), and a first motor (15) is installed on the outer side of the base (4), and the output shaft of the first motor (15) is connected to one end of the screw rod (17) through a torque limiter (16).

2. The adaptive feeding mechanism of the elbow spot welding machine according to claim 1, characterized in that: The track comprises a frame (1), two guide rails (2) are provided on the frame (1), a guide rack (3) is provided on the inner side of one of the guide rails (2), a guide assembly adapted to the guide rail (2) is provided at the bottom of the base (4), a second motor (18) is also installed in the base (4), and a driving gear (20) connected to the guide rack (3) is provided at the bottom end of the second motor (18).

3. The adaptive feeding mechanism of the elbow spot welding machine according to claim 2, characterized in that: A support plate (25) is provided in the base (4), one end of the screw rod (17) is provided on the top of the support plate (25) through a bearing seat, the first motor (15) connected to the other end of the screw rod (17) is installed on the outer wall of the base (4) through a bracket (14), a first hinge seat (21) is provided on the side of the support plate (25), the support plate (25) is hinged to a mounting seat (19) through the first hinge seat (21), and the mounting seat (19) is hinged to the first hinge seat (21). ) rotates in the radial plane of the driving gear (20), and a guide plate (22) is further provided at one end of the mounting seat (19) away from the first hinge seat (21), and an open groove is provided on the guide plate (22). A guide rod (23) is fixedly connected to the side of the support plate (25), and a counter-top spring (24) is provided on the guide rod (23). The guide rod (23) is inserted into the open groove from one side of the guide plate (22) and one end of the counter-top spring (24) is against the guide plate (22).

4. The adaptive feeding mechanism of the elbow spot welding machine according to claim 2 or 3, characterized in that: The guide assembly comprises a first roller (26), a second roller (27) and a third roller (30); the guide rail (2) adopts an I-shaped guide rail (2); the first roller (26) is mounted on the inner side of the base (4) through a guide seat (28) and the first roller (26) abuts against the top surface of the guide rail (2); a support seat (34) for mounting the second roller (27) is provided on the side of the guide seat (28); the second roller (27) extends into the I-shaped groove of the guide rail (2) and forms a top contact with the first roller (26); a fixing seat (29) for mounting the third roller (30) is further provided at the outer bottom end of the base (4); the third roller (30) is used to vertically abut against the two side edges of the top of the guide rail (2).

5. The adaptive feeding mechanism of the elbow spot welding machine according to claim 2 or 3, characterized in that: A slide rail (31) is provided at the top end of the base (4), a plurality of slider bodies (32) are provided on the slide rail (31), and the bottom end surface of the slider plate (5) is fixedly connected to the top end of the slider body (32).

6. The adaptive feeding mechanism of the pipe bending spot welding machine according to claim 4, characterized in that: The base (4) is connected to a sensor bracket (14) at one end, and a plurality of proximity switches are provided on the sensor bracket (14). The side of the slider plate (5) is connected to an L-shaped plate. When the slider plate (5) and the base (4) slide relative to each other, the horizontal surface of the L-shaped plate passes through the sensing end of each proximity switch.

7. The adaptive feeding mechanism of the pipe bending spot welding machine according to claim 4, characterized in that: One end of the slider plate (5) is provided with a rotating base (114), a second hinge seat (9) and a third hinge seat (13); one end of the rotating base (114) is hinged to the slider plate (5) through the second hinge seat (9); a movable screw (10) is hinged on the third hinge seat (13); one end of the rotating base (114) away from the second hinge seat (9) is connected to a limiting plate (12); a socket for the movable screw (10) to pass through is provided on the limiting plate (12); and the movable screw (10) is located on both sides of the limiting plate (12) and is connected to limiting bolts.

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