Reinforcing rib welding device for machining of marine lifting winding drum

Abstract

The invention relates to the technical field of winding drum welding machining, and discloses a reinforcing rib welding device for machining a marine lifting winding drum, which comprises a bottom frame, one side of the bottom frame is provided with a supporting assembly for supporting the winding drum, and the interior of the bottom frame is provided with a rotary driving assembly through a lifting assembly; the rotary driving assembly drives a winding drum arranged at the top of the supporting assembly to rotate, and a welding positioning assembly for positioning a winding drum reinforcing rib is arranged on one side of the bottom frame. Through cooperative use of the supporting assembly, the rotary driving assembly, the welding positioning assembly and the lifting assembly, automatic positioning welding of a winding drum and a reinforcing rib is achieved, the equipment integration degree is high, use is convenient, the accuracy of the welding position and the consistency of the welding quality are guaranteed, the reinforcing rib is conveniently positioned and installed through a positioning caulking groove, and the welding efficiency is improved. And through cooperative use of the second adjusting threaded rod and the first adjusting threaded rod, dynamic adjustment of the position of the positioning formwork along with the position of the winding drum is completed.

Description

Technical Field

[0001] This invention relates to the field of drum welding technology, specifically to a reinforcing rib welding device for processing marine hoisting drums. Background Technology

[0002] In the field of marine engineering, marine hoisting drums are used as key load-bearing components in equipment such as cranes and winches, and their structural strength is directly related to the safety and reliability of ship operations.

[0003] To improve the load-bearing capacity and deformation resistance of the hoisting drum, reinforcing ribs are usually welded around the ends of the drum.

[0004] 1. Currently, the welding of reinforcing ribs for marine hoisting drums mainly relies on manual welding. Manual welding is not only labor-intensive, but also prone to problems such as incomplete welding and missed welding.

[0005] 2. During welding, welders need to rely on experience to position the reinforcing ribs and the side of the drum, and then carry out the welding operation until the side of the drum and multiple reinforcing ribs are welded together. However, it is difficult to guarantee the accuracy of the welding position and the consistency of the welding quality. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a welding device for reinforcing ribs in marine hoisting drums. The main purpose is to solve the problem that currently, the welding of reinforcing ribs on marine hoisting drums mainly relies on manual welding. Manual welding is not only labor-intensive but also prone to problems such as incomplete welds and missed welds. Furthermore, during welding, welders must rely on experience to align and position the reinforcing ribs with the drum side before proceeding with the welding operation, continuing until the drum side and multiple reinforcing ribs are welded together. However, it is difficult to guarantee the accuracy of the welding position and the consistency of the welding quality.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A welding device for reinforcing ribs in marine hoisting drum processing includes a base frame. A support assembly for supporting the drum is provided on one side of the base frame. A rotary drive assembly is installed inside the base frame through a lifting assembly. The rotary drive assembly drives the drum located on top of the support assembly to rotate. A welding positioning assembly for positioning the reinforcing ribs of the drum is provided on one side of the base frame.

[0009] As a further embodiment of the present invention, the support assembly includes two sleeves welded to the bottom of the base frame, a transverse frame slidably connected between the two sleeves, rollers rotatably connected at the four corners of the transverse frame, four symmetrically distributed support frames fixedly connected to the top of the transverse frame, support rollers rotatably connected to the ends of the support frames, a side top frame fixedly connected to one side of two of the support frames, a plurality of equally spaced support slots opened on one side of the side top frame, ball bearings rotatably connected in the support slots to provide side support for the drum, and a transverse drive component for adjusting the position of the transverse frame provided on one side of the base frame.

[0010] As a further embodiment of the present invention, the lateral drive component is a lateral movement cylinder, which is fixedly connected inside the base frame, and one end of the piston rod of the lateral movement cylinder passes through the base frame and is fixed to the lateral movement frame.

[0011] As a further embodiment of the present invention, the rotary drive assembly includes a reducer fixed inside the lifting assembly. A drive motor for driving the reducer drive shaft to rotate is provided on one side of the reducer. A top column is fixedly connected to one end of the reducer output shaft. An installation groove is provided at one end of the top column, and a rubber pad that can contact the end of the drum is adhered in the installation groove.

[0012] As a further embodiment of the present invention, a rotating frame is fixedly connected to the outer circumference of the top column, and a plurality of equally spaced sensing columns are fixedly connected to one side of the rotating frame. The sensing columns correspond to the positions of the drum reinforcing ribs, and a proximity switch that cooperates with the sensing columns is fixedly connected to one side of the outer wall of the reducer.

[0013] As a further embodiment of the present invention, the lifting assembly includes multiple vertical guide rails fixedly connected inside the base frame, and a lifting frame is slidably connected between two adjacent vertical guide rails via a slide table. The two lifting frames are fixedly connected to a rotary drive assembly. Lifting cylinders that drive the lifting frames to move vertically along the vertical guide rails are provided on both sides of the base frame.

[0014] As a further embodiment of the present invention, multiple equally spaced locking holes are provided on both sides of the base frame, and an electromagnetic lock that can cooperate with the locking holes is fixedly connected to one side of each of the two lifting frames.

[0015] As a further embodiment of the present invention, the welding positioning assembly includes a lower bracket fixedly connected to one side of the base frame, an upper bracket inserted into the top of the lower bracket, two sliding rods fixedly connected inside the upper bracket, an adjusting slide slidably connected between the two sliding rods, a top material cylinder fixedly connected to the top of the adjusting slide, a movable frame fixedly connected to one end of the piston rod of the top material cylinder, and a guide rod slidably connected to the adjusting slide fixedly connected to one end of the movable frame, a positioning mold frame fixedly connected to one side of the movable frame, and a positioning groove for positioning the reinforcing ribs opened on the top of the positioning mold frame.

[0016] As a further embodiment of the present invention, the positioning mold frame is provided with clearance grooves on multiple sides to avoid the welding position of the reinforcing rib and the roll.

[0017] As a further embodiment of the present invention, the lower bracket is rotatably connected to an adjusting threaded rod 1 via a bearing, and the adjusting threaded rod 1 is threadedly connected to the upper bracket. The upper bracket is rotatably connected to an adjusting threaded rod 2 via a bearing, and the adjusting threaded rod 2 is threadedly connected to the adjusting slide. The upper bracket and the adjusting slide are respectively provided with nylon inserts that contact the adjusting threaded rod 1 and the adjusting threaded rod 2.

[0018] Compared with the prior art, the present invention provides a reinforcing rib welding device for processing marine hoisting drums, which has the following beneficial effects:

[0019] 1. This invention achieves automatic positioning and welding of the drum and reinforcing ribs through the coordinated use of a support component, a rotation drive component, a welding positioning component, and a lifting component. The equipment has a high degree of integration, is easy to use, and ensures the accuracy of the welding position and the consistency of the welding quality.

[0020] 2. The present invention adjusts the position of the reducer by lifting the hydraulic cylinder and makes the top column coincide with the center line of the drum, so as to stably drive the drum to rotate.

[0021] 3. The present invention uses the extension of the latch of the electromagnetic lock to insert into the locking hole, thereby locking and fixing the position of the reducer and ensuring the stability of the reducer.

[0022] 4. The present invention provides side support for the edge of the drum by means of a side top frame, and since multiple ball bearings are set on one side of the side top frame, the friction between the drum and the side top frame during rotation can be effectively reduced.

[0023] 5. The present invention provides a positioning groove to facilitate the positioning and installation of the reinforcing ribs, and through the coordinated use of adjusting threaded rod two and adjusting threaded rod one, the position of the positioning mold frame can be dynamically adjusted according to the position of the drum. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the front side of a reinforcing rib welding device for processing marine hoisting drums proposed in this invention.

[0025] Figure 2 This is a three-dimensional structural diagram of the rear side of a reinforcing rib welding device for processing marine hoisting drums proposed in this invention.

[0026] Figure 3 This is a schematic diagram of the rotary drive assembly structure of a reinforcing rib welding device for processing marine hoisting drums proposed in this invention.

[0027] Figure 4 This is a partially enlarged structural schematic diagram of a reinforcing rib welding device for processing marine hoisting drums proposed in this invention;

[0028] Figure 5 This is a schematic diagram of the welding positioning assembly structure of a reinforcing rib welding device for processing marine hoisting drums proposed in this invention.

[0029] In the diagram: 1. Support assembly; 2. Base frame; 3. Lifting assembly; 4. Rotation drive assembly; 5. Welding positioning assembly;

[0030] 101. Support roller; 102. Support frame; 103. Roller; 104. Transverse frame; 105. Sleeve; 106. Transverse cylinder; 107. Side top frame; 108. Support groove; 109. Ball bearing;

[0031] 301. Lifting cylinder; 302. Lifting frame; 303. Locking hole; 304. Electromagnetic lock; 305. Vertical guide rail; 401. Reducer; 402. Drive motor; 403. Top column; 404. Rubber pad; 405. Mounting slot; 406. Proximity switch; 407. Sensing column; 408. Rotating frame;

[0032] 501. Lower support; 502. Upper support; 503. Adjusting threaded rod one; 504. Adjusting threaded rod two; 505. Slide rod; 506. Adjusting slide; 508. Ejector cylinder; 509. Guide rod; 510. Moving frame; 511. Positioning mold frame; 512. Positioning groove; 513. Clearance groove; 514. Nylon insert. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0034] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0036] Please see Figures 1-5 As shown, a welding device for reinforcing ribs in marine hoisting drum processing includes a base frame 2. A support assembly 1 for supporting the drum is provided on one side of the base frame 2. A rotary drive assembly 4 is installed inside the base frame 2 through a lifting assembly 3. The rotary drive assembly 4 drives the drum set on top of the support assembly 1 to rotate. A welding positioning assembly 5 for positioning the reinforcing ribs of the drum is provided on one side of the base frame 2.

[0037] In this invention, the support assembly 1 includes two sleeves 105 welded to the bottom of the base frame 2. A transverse frame 104 is slidably connected between the two sleeves 105. Rollers 103 are rotatably connected to the four corners of the transverse frame 104. Four symmetrically distributed support frames 102 are fixed to the top of the transverse frame 104 by bolts. Support rollers 101 are rotatably connected to the ends of the support frames 102. A side top frame 107 is fixed to one side of two support frames 102 by bolts. A plurality of equally spaced support slots 108 are provided on one side of the side top frame 107. Ball bearings 109 for side top support of the drum are rotatably connected in the support slots 108. A transverse drive component for adjusting the position of the transverse frame 104 is provided on one side of the base frame 2. The transverse drive component is a transverse cylinder 106. The transverse cylinder 106 is fixed inside the base frame 2 by bolts. One end of the piston rod of the transverse cylinder 106 passes through the base frame 2 and is fixed to the transverse frame 104.

[0038] Specifically, by placing the roll between multiple support rollers 101, and then activating the transverse cylinder 106, the transverse cylinder 106 shortens and drives the transverse frame 104 to move along the sleeve 105 via the roller 103. At this time, the roll supported by the support rollers 101 moves accordingly and contacts the rotation drive assembly 4, thereby realizing the docking and rotation drive of the roll.

[0039] At this time, the edge of the drum can be supported by the side top frame 107. Since multiple balls 109 are provided on one side of the side top frame 107, the friction between the drum and the side top frame 107 during rotation can be effectively reduced.

[0040] In this invention, the rotary drive assembly 4 includes a reducer 401 fixed inside the lifting assembly 3. A drive motor 402 is provided on one side of the reducer 401 to drive the drive shaft of the reducer 401 to rotate. One end of the output shaft of the reducer 401 is fixed with a top column 403 by bolts. One end of the top column 403 is provided with a mounting groove 405. A rubber pad 404 that can contact the end of the drum is glued in the mounting groove 405.

[0041] Specifically, by starting the drive motor 402, the rotation of the drive motor 402 causes the reducer 401 to rotate through the drive shaft, so the top column 403 can drive the drum to rotate synchronously through the rubber pad 404.

[0042] In this invention, a rotating frame 408 is fixed to the outer circumference of the top column 403 by bolts, and a plurality of equally spaced sensing columns 407 are fixed to one side of the rotating frame 408 by bolts. The sensing columns 407 correspond to the positions of the drum reinforcing ribs. A proximity switch 406 that cooperates with the sensing columns 407 is fixed to one side of the outer wall of the reducer 401 by bolts.

[0043] Specifically, since the sensing post 407 corresponds to the position of the reinforcing rib, the rotation angle of the drum can be located by the proximity switch 406 and the sensing post 407, which helps to locate the position of the reinforcing rib later.

[0044] In this invention, the lifting assembly 3 includes multiple vertical guide rails 305 fixed inside the base frame 2 by bolts. A lifting frame 302 is slidably connected between two adjacent vertical guide rails 305 via a slide table. The two lifting frames 302 are fixedly connected to the rotary drive assembly 4. Lifting cylinders 301 are provided on both sides of the base frame 2 to drive the lifting frames 302 to move vertically along the vertical guide rails 305. Multiple locking holes 303 are provided on both sides of the base frame 2 at equal intervals. An electromagnetic lock 304 that can cooperate with the locking hole 303 is fixed to one side of each of the two lifting frames 302 by bolts.

[0045] Specifically, by activating the lifting cylinder 301, the lifting cylinder 301 extends and drives the reducer 401 to move upward. At this time, the top column 403 coincides with the center line of the drum. Therefore, the rotation of the output shaft of the reducer 401 can drive the drum to rotate synchronously through the rubber pad 404.

[0046] After the position of the reducer 401 is adjusted, the electromagnetic lock 304 is activated. The locking tongue of the electromagnetic lock 304 extends and inserts into the locking hole 303, thereby locking and fixing the position of the reducer 401.

[0047] In this invention, the welding positioning assembly 5 includes a lower support 501 bolted to one side of the base frame 2. An upper support 502 is inserted into the top of the lower support 501. Two sliding rods 505 are bolted inside the upper support 502. An adjusting slide 506 is slidably connected between the two sliding rods 505. A top-loading cylinder 508 is bolted to the top of the adjusting slide 506. A movable frame 510 is bolted to one end of the piston rod of the top-loading cylinder 508. A guide rod 509 slidably connected to the adjusting slide 506 is bolted to one end of the movable frame 510. A positioning mold frame 511 is bolted to one side of the movable frame 510. A positioning insert for positioning the reinforcing rib is provided on the top of the positioning mold frame 511. The groove 512 and the positioning mold frame 511 are provided with clearance grooves 513 on multiple sides to avoid the welding position of the reinforcing rib and the roll. The lower support 501 is rotatably connected to the adjusting threaded rod 503 through the bearing, and the adjusting threaded rod 503 is threadedly connected to the upper support 502. The upper support 502 is rotatably connected to the adjusting threaded rod 504 through the bearing, and the adjusting threaded rod 504 is threadedly connected to the adjusting slide 506. The upper support 502 and the adjusting slide 506 are respectively provided with nylon inserts 514 that contact the adjusting threaded rod 503 and the adjusting threaded rod 504. The nylon inserts 514 can increase the friction, thereby realizing the locking of the adjusting threaded rod 503 and the adjusting threaded rod 504.

[0048] Specifically, the reinforcing rib is placed in the positioning groove 512 and positioned. Then, by rotating the adjusting threaded rod 503, the upper support 502 moves upward along the lower support 501 until the horizontal position of the reinforcing rib coincides with the horizontal position of the center line of the drum. Then, by rotating the adjusting threaded rod 504, the adjusting slide 506 moves along the slide rod 505 until the lateral position of the reinforcing rib corresponds to the welding position of the drum. At this time, the ejector cylinder 508 is activated, and the ejector cylinder 508 extends, causing the positioning mold frame 511 to extend until the reinforcing rib installed on the positioning mold frame 511 is aligned with the side of the drum. Then, the welder holds the welding torch to perform the welding operation. At this time, the clearance groove 513 can avoid the welding point position.

[0049] The present invention is used in the following steps:

[0050] S1: First, the drum is placed between multiple support rollers 101. Then, the lifting cylinder 301 is activated. The lifting cylinder 301 extends and drives the reducer 401 to move upward. At this time, the top column 403 coincides with the center line of the drum. After the position of the reducer 401 is adjusted, the electromagnetic lock 304 is activated. The locking tongue of the electromagnetic lock 304 extends and inserts into the locking hole 303, thereby locking and fixing the position of the reducer 401.

[0051] S2: Then start the transverse cylinder 106. The transverse cylinder 106 shortens and drives the transverse frame 104 to move along the sleeve 105 through the roller 103. At this time, the drum supported by the support roller 101 moves accordingly and makes the drum contact the rotary drive assembly 4, thereby realizing the docking and rotary drive of the drum.

[0052] S3: At this time, the side top frame 107 provides side support for the edge of the drum. Since multiple balls 109 are set on one side of the side top frame 107, the friction between the drum and the side top frame 107 during rotation can be effectively reduced.

[0053] S4: Then, by starting the drive motor 402, the drive motor 402 rotates and drives the reducer 401 to rotate through the drive shaft. Therefore, the top column 403 can drive the drum to rotate synchronously through the rubber pad 404, and the rotation angle position of the drum is located through the proximity switch 406 and the sensing column 407.

[0054] S5: At this time, the reinforcing rib is placed in the positioning groove 512 and its position is positioned. Then, by rotating the adjusting threaded rod 503, the upper support 502 moves upward along the lower support 501 until the horizontal position of the reinforcing rib coincides with the horizontal position of the center line of the drum. Then, by rotating the adjusting threaded rod 504, the adjusting slide 506 moves along the slide rod 505 until the lateral position of the reinforcing rib corresponds to the welding position of the drum. At this time, the ejector cylinder 508 is activated, and the ejector cylinder 508 extends, causing the positioning mold frame 511 to extend until the reinforcing rib installed on the positioning mold frame 511 is connected to the side of the drum. Then, the welder holds the welding gun to perform welding operations. At this time, the clearance groove 513 can avoid the welding point position.

[0055] S6: After one of the reinforcing ribs is welded, the top cylinder 508 shortens and resets, and then the reinforcing rib is repositioned in the positioning groove 512. Then the drum continues to rotate and is positioned to the next welding angle position by the proximity switch 406 and the sensing column 407, and the action of S5 is repeated until the welding operation is completed.

[0056] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A welding device for reinforcing ribs in the processing of marine hoisting drums, comprising a base frame (2), characterized in that, The base frame (2) has a support assembly (1) for supporting the drum on one side. The base frame (2) has a rotary drive assembly (4) installed inside through a lifting assembly (3). The rotary drive assembly (4) drives the drum set on top of the support assembly (1) to rotate. The base frame (2) has a welding positioning assembly (5) for positioning the drum reinforcing ribs on one side.

2. The reinforcing rib welding device for processing marine hoisting drums according to claim 1, characterized in that, The support assembly (1) includes two sleeves (105) welded to the bottom of the base frame (2). A transverse frame (104) is slidably connected between the two sleeves (105). Rollers (103) are rotatably connected to the four corners of the transverse frame (104). Four symmetrically distributed support frames (102) are fixedly connected to the top of the transverse frame (104). Support rollers (101) are rotatably connected to the ends of the support frames (102). A side top frame (107) is fixedly connected to one side of two of the support frames (102). A plurality of equally spaced support slots (108) are opened on one side of the side top frame (107). A ball bearing (109) for side top support of the drum is rotatably connected in the support slot (108). A transverse drive component for driving the transverse frame (104) to adjust its position is provided on one side of the base frame (2).

3. The reinforcing rib welding device for processing marine hoisting drums according to claim 2, characterized in that, The lateral drive component is a lateral movement cylinder (106), which is fixedly connected inside the base frame (2). One end of the piston rod of the lateral movement cylinder (106) passes through the base frame (2) and is fixed to the lateral movement frame (104).

4. The reinforcing rib welding device for processing marine hoisting drums according to claim 1, characterized in that, The rotary drive assembly (4) includes a reducer (401) fixed inside the lifting assembly (3). A drive motor (402) for driving the drive shaft of the reducer (401) to rotate is provided on one side of the reducer (401). A top column (403) is fixedly connected to one end of the output shaft of the reducer (401). A mounting groove (405) is opened at one end of the top column (403). A rubber pad (404) that can contact the end of the drum is glued in the mounting groove (405).

5. The reinforcing rib welding device for processing marine hoisting drums according to claim 4, characterized in that, A rotating frame (408) is fixedly connected to the outer circumference of the top column (403). A plurality of equally spaced sensing columns (407) are fixedly connected to one side of the rotating frame (408). The sensing columns (407) correspond to the positions of the drum reinforcing ribs. A proximity switch (406) that cooperates with the sensing columns (407) is fixedly connected to one side of the outer wall of the reducer (401).

6. The reinforcing rib welding device for processing marine hoisting drums according to claim 1, characterized in that, The lifting assembly (3) includes multiple vertical guide rails (305) fixedly connected inside the base frame (2). Two adjacent vertical guide rails (305) are slidably connected to a lifting frame (302) via a slide table. The two lifting frames (302) are fixedly connected to the rotary drive assembly (4). The base frame (2) is provided with lifting cylinders (301) on both sides to drive the lifting frame (302) to move vertically along the vertical guide rails (305).

7. The reinforcing rib welding device for processing marine hoisting drums according to claim 6, characterized in that, The base frame (2) has multiple equally spaced locking holes (303) on both sides, and each of the two lifting frames (302) is fixedly connected to an electromagnetic lock (304) that can cooperate with the locking holes (303).

8. The reinforcing rib welding device for processing marine hoisting drums according to claim 1, characterized in that, The welding positioning assembly (5) includes a lower bracket (501) fixedly connected to one side of the base frame (2), an upper bracket (502) inserted into the top of the lower bracket (501), two slide rods (505) fixedly connected inside the upper bracket (502), an adjusting slide (506) slidably connected between the two slide rods (505), a top material cylinder (508) fixedly connected to the top of the adjusting slide (506), a movable frame (510) fixedly connected to one end of the piston rod of the top material cylinder (508), and a guide rod (509) slidably connected to the adjusting slide (506) fixedly connected to one end of the movable frame (510), and a positioning mold frame (511) fixedly connected to one side of the movable frame (510), and a positioning groove (512) for positioning the reinforcing rib is opened on the top of the positioning mold frame (511).

9. A reinforcing rib welding device for processing marine hoisting drums according to claim 8, characterized in that, The positioning mold frame (511) has clearance grooves (513) on multiple sides to avoid the welding position of the reinforcing rib and the roll.

10. A reinforcing rib welding device for processing marine hoisting drums according to claim 8, characterized in that, The lower bracket (501) is rotatably connected to an adjusting threaded rod (503) via a bearing, and the adjusting threaded rod (503) is threadedly connected to the upper bracket (502). The upper bracket (502) is rotatably connected to an adjusting threaded rod (504) via a bearing, and the adjusting threaded rod (504) is threadedly connected to the adjusting slide (506). The upper bracket (502) and the adjusting slide (506) are respectively provided with nylon inserts (514) that contact the adjusting threaded rod (503) and the adjusting threaded rod (504).

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