Winding device for transformer winding machine

Abstract

The utility model relates to the field of transformer winding, in particular to a winding device for a transformer winding machine. The speed reducer is detachably connected in the box body; the main shaft is detachably connected into the speed reducer, the two ends of the main shaft extend to the outer side of the speed reducer, and one end of the main shaft penetrates through one side of the box body; a penetrating through hole is formed in the axial center of the main shaft, and the center shaft is located in the through hole; the pushing part is detachably connected to the other side of the box body, the driving end of the pushing part penetrates through the box body and is detachably connected with one end of the center shaft, and the other end of the center shaft is a pushing end; the rotary connecting part is detachably connected to the box body, and one end of the main shaft penetrates through the rotary connecting part; due to the adoption of the central shaft, the problem that the square shaft of the die is not easy to separate after being connected is effectively solved, and further the central shaft is pushed by the air cylinder to be separated from the inner sleeve.

Description

Technical Field

[0001] The utility model relates to the field of transformer winding, in particular to a winding device used for a transformer winding machine. Background Art

[0002] At present, during the winding process of the transformer coil, a square shaft is used to transmit torque. However, when using the square shaft, it is necessary to insert the square shaft into the square hole of the main spindle box. During the insertion process, due to various reasons, the square shaft will not be properly aligned and will hit the square hole of the main spindle box. After repeated use, the square hole will be deformed and need to be replaced. Utility Model Content

[0003] The present application provides a winding device for a transformer winding machine, which solves the problem of connection failure caused by slight errors when docking with the winding mold or mold eccentricity after operation, and realizes passive adjustment during connection with the mold square shaft and operation, thereby preventing abnormal vibration and inability to align the connection.

[0004] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0005] A winding device for a transformer winding machine, comprising:

[0006] Box;

[0007] A reducer, which is detachably connected in the box;

[0008] A main shaft, which is detachably connected to the reducer, with both ends of the main shaft extending to the outside of the reducer, and one end of the main shaft passing through one side of the box;

[0009] A central shaft, wherein a through hole is formed at the axial center of the main shaft, and the central shaft is located in the through hole;

[0010] A pushing part, which is detachably connected to the other side of the box body, and a driving end of the pushing part passes through the box body and is detachably connected to one end of the central axis, and the other end of the central axis is a pushing end;

[0011] A rotating connection part, which is detachably connected to the box body, and one end of the main shaft passes through the rotating connection part;

[0012] The plug-in part is detachably connected to one end of the main shaft, and the pushing end of the central shaft is located in the plug-in part.

[0013] Furthermore, both ends of the through hole in the main shaft are detachably connected with ball bushings, and the central shaft is located in a pair of ball bushings.

[0014] Furthermore, a limiting step is provided on the main shaft, the limiting step is in contact with the reducer, a removable clamping nut is provided on the main shaft, a spacer sleeve is provided between the clamping nut and the reducer, and the reducer is located between the spacer sleeve and the limiting step.

[0015] Furthermore, the rotating connection part includes: a bearing seat, a bearing, a pair of sealing rings, a left pressure cover and a second clamping nut. A mounting hole is opened on the housing. The bearing seat is detachably connected to the mounting hole. A bearing is embedded in the bearing seat. The main shaft passes through the bearing and is detachably connected to the plug-in part. One side of the bearing seat is detachably connected to the left pressure cover. Sealing rings are respectively arranged on the inner circumferential surfaces of the bearing seat and the left pressure cover and on the outer circumferential surface of the main shaft. A pair of sealing rings are respectively connected to the bearing seat and the left pressure cover for rotational sealing. The bearing is located between the pair of sealing rings. The main shaft is detachably connected to a second clamping nut, and one side of the second clamping nut is in contact with the sealing ring located in the left pressure cover.

[0016] Furthermore, the plug-in portion includes an adjusting portion, a connecting seat, an adjusting seat and a second spacer sleeve, a protrusion is opened at one end of the connecting seat, a pressure groove matching the protrusion is opened at one end of the main shaft, the connecting seat is detachably connected to the end of the main shaft, the protrusion is located in the pressure groove, a connecting seat through hole with the same diameter as the through hole is opened at the center of the connecting seat, the center axis passes through the connecting seat through hole, the adjusting seat is detachably connected to the other end of the connecting seat, square holes of the same size are opened at the centers of the connecting seat and the adjusting seat, the connecting seat through hole is communicated with the square hole, the adjusting portion is detachably connected in the square hole, the second spacer sleeve is sleeved on the outer circumference of the main shaft, and the two side surfaces of the second spacer sleeve are respectively in contact with the sealing rings in the connecting seat and the bearing seat.

[0017] Further, the adjusting part comprises an inner sleeve, an outer ring, a sleeve ring, a connecting plate, a spring and a screw, the outer circumferential surface of the outer ring is axially provided with an outer arc surface, the outer ring is fixed on the outer surface of the inner sleeve, and the outer ring is coaxial with the inner sleeve, a plurality of connecting plates are equidistantly fixed on the outer circumferential surface of the outer ring, the connecting plates are provided with adjusting through holes, the opposite surfaces of the connecting seat and the adjusting seat are respectively equidistantly provided with a plurality of left half-slots and right half-slots, the left half-slots and the right half-slots are communicated with the square hole, the left half-slots and the right half-slots are provided with an inner arc surface with the same curvature as the outer arc surface of the outer ring, the opposite surfaces of the connecting seat and the adjusting seat are respectively equidistantly provided with left spring grooves and right spring grooves, the inner sleeve is arranged in the square holes of the connecting seat and the adjusting seat, The outer ring is located between the left half slot and the right half slot, the connecting plate is located between the left spring slot and the right spring slot, and springs are respectively arranged between the left spring slot and the right spring slot on both sides of the connecting plate, a screw through hole is opened on the adjusting seat, one end of the screw passes through the screw through hole, the spring in the right spring slot, the adjusting through hole of the connecting plate and the spring in the left spring slot in sequence, and then is threadedly connected to the connecting seat, the collar is arranged between the connecting seat and the adjusting seat, and the two side surfaces of the collar are respectively in contact with the opposite surfaces of the connecting seat and the adjusting seat, and the collar is located on the outside of the connecting plate, the inner sleeve is a square tube with a square structure, the width of the collar is greater than the width of the connecting plate, the adjusting through hole is a long hole, and the aperture of the adjusting through hole is greater than the diameter of the screw.

[0018] The beneficial effect of the utility model is that the central shaft is adopted, which effectively solves the problem that the square shaft of the mold is difficult to separate after being connected, and further realizes the separation of the central shaft from the inner sleeve by pushing the central shaft through the cylinder.

[0019] The use of ball bushings effectively solves the problem of severe wear caused by internal friction between the center shaft and the main shaft, which prevents the cylinder from operating normally. The ball bushings can reduce the friction between the main shaft and the center shaft, and also play a guiding role, allowing the cylinder to operate normally.

[0020] By adopting an outer ring with an arc surface and left and right half slots with the same arc, the problem of vibration caused by the inner sleeve and the main shaft being not concentric is effectively solved, thereby realizing the coordinated use of the outer ring, the half slot and the right half slot. When the inner sleeve rotates, the outer ring will follow the square shaft for adaptive adjustment, thereby solving the problem of not concentricity.

[0021] The use of a spring effectively solves the problem of the inner sleeve not returning to its original position after deflection, thereby achieving that when the inner sleeve is deflected by the outer ring, the connecting plate will be driven to compress the spring on the corresponding side. When the inner sleeve is not restricted, the compressed spring will push the connecting plate to enable the outer ring to drive the inner sleeve to return to its original position. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1It is a structural schematic diagram of the utility model.

[0024] Figure 2 It is a schematic diagram of the position structure of the connecting seat, the adjusting seat, the connecting plate and the outer ring of the utility model.

[0025] Figure 3 It is a side view of the utility model.

[0026] Figure 4 It is a structural schematic diagram of the inner sleeve, outer ring and connecting plate of the utility model.

[0027] Figure 5 It is a schematic diagram of the sleeve ring structure of the utility model.

[0028] Figure 6 It is a cross-sectional view of the sleeve ring of the present utility model.

[0029] Figure 7 It is a schematic diagram of the connecting seat structure of the utility model.

[0030] Figure 8 It is a structural schematic diagram of the adjustment seat of the utility model.

[0031] In the figure: 1-housing; 2-reducer; 3-spindle; 4-center shaft; 5-ball bushing; 6-pressure nut 1; 7-spacer 1; 8-bearing seat; 9-bearing; 10-sealing ring; 11-left pressure cover; 12-pressure nut 2; 13-connecting seat; 14-adjusting seat; 15-spacer 2; 16-inner sleeve; 17-outer ring; 18-collar ring; 19-connecting plate; 20-spring; 21-screw; 22-outer arc surface; 23-left half slot; 24-right half slot. DETAILED DESCRIPTION

[0032] Embodiment 1:

[0033] Reference Figure 1-3 , is a schematic diagram of the structure of Embodiment 1 of the present utility model, a winding device for a transformer winding machine, comprising:

[0034] Box 1;

[0035] A reducer 2, which is detachably connected to the housing 1;

[0036] A main shaft 3, which is detachably connected to the reducer 2, and both ends of the main shaft 3 extend to the outside of the reducer 2, and one end of the main shaft 3 passes through one side of the box 1;

[0037] A central shaft 4, wherein a through hole is formed at the axial center of the main shaft 3, and the central shaft 4 is located in the through hole;

[0038] A pushing part, which is detachably connected to the other side of the box body 1, and a driving end of the pushing part passes through the box body 1 and is detachably connected to one end of the central shaft 4, and the other end of the central shaft 4 is a pushing end;

[0039] A rotating connection part, which is detachably connected to the box body 1, and one end of the main shaft 3 passes through the rotating connection part;

[0040] The plug-in part is detachably connected to one end of the main shaft 3, and the pushing end of the central shaft 4 is located in the plug-in part.

[0041] In actual use: connect the driving device with the reducer 2, so that the driving device drives the reducer 2 to move and connect it with the driving square shaft of the winding mold through the plug-in part. Generally, a motor is used for driving, and then the reducer 2 drives the main shaft 3 to rotate, and the main shaft 3 drives the square shaft to rotate through the plug-in part, thereby driving the winding mold to wind. After the winding is completed, the central shaft 4 is pushed toward the plug-in part through the pushing part, and the square shaft is pushed to separate from the plug-in part, completing this winding drive connection.

[0042] Embodiment 2:

[0043] Reference Figure 1 The difference of this embodiment is that: the two ends of the through hole in the main shaft 3 are detachably connected with ball bushings 5, and the central shaft 4 is located in a pair of ball bushings 5.

[0044] In actual use: the ball bushing 5 can be used to set the center shaft 4 in the center, so that the center shaft 4 and the main shaft 3 will not be in direct contact and wear. At the same time, the ball bushing 5 can improve the smoothness of the movement of the center shaft and reduce friction resistance.

[0045] Embodiment 3:

[0046] Reference Figure 1 The difference of this embodiment is that: a limiting step is provided on the main shaft 3, the limiting step is in contact with the reducer 2, a removable clamping nut 6 is provided on the main shaft 3, a spacer sleeve 7 is provided between the clamping nut 6 and the reducer 2, and the reducer 2 is located between the spacer sleeve 7 and the limiting step.

[0047] In actual use: the main shaft 3 is used as a supporting component of the reduction gear in the reducer 2, so that the main shaft 3 can be driven without a separate transmission box, while reducing the overall equipment volume and weight. By performing adaptive processing on the main shaft 3 during processing, the main shaft 3 can pass through the reducer 2, and the main shaft 3 and the reducer are locked by the clamping nut 6 and the spacer sleeve 7 to prevent string movement.

[0048] Embodiment 4:

[0049] Reference Figure 1-2The difference of this embodiment is that: the rotating connection part includes: a bearing seat 8, a bearing 9, a pair of sealing rings 10, a left pressure cover 11 and a second clamping nut 12, a mounting hole is opened on the box body 1, the bearing seat 8 is detachably connected in the mounting hole, the bearing seat 8 is embedded with a bearing 9, the main shaft 3 passes through the bearing 9 and is detachably connected to the plug-in part, one side of the bearing seat 8 is detachably connected to the left pressure cover 11, the inner circumferential surfaces of the bearing seat 8 and the left pressure cover 11 and the outer circumferential surface of the main shaft 3 are respectively provided with sealing rings 10, a pair of the sealing rings 10 are respectively rotatably sealed and connected to the bearing seat 8 and the left pressure cover 11, the bearing 9 is located between the pair of sealing rings 10, and the main shaft 3 is detachably connected to the second clamping nut 12, and one side of the second clamping nut 12 is in contact with the sealing ring 10 located in the left pressure cover 11.

[0050] In actual use: the main shaft 3 rotates in the bearing seat 8 equipped with the bearing 9, and at the same time, a sealing ring 10 is arranged between the outer circumference of the main shaft 3 and the bearing seat 8 and the left pressure cover 11, so that the lubricating fluid of the bearing 9 or the environmental dust enters the housing 1, and the bearing 9 and the space inside the housing 1 are isolated. At the same time, the bearing seat 8 is connected to the housing 1, so that the main shaft 3 at this end will not have the problem of non-concentricity of the main shaft 3 when rotating, thereby playing a stabilizing role. At the same time, the tightening nut 12 can prevent the contacting sealing rings 10 from moving in series, and the main shaft 3 and the bearing seat 8, bearing 9, a pair of sealing rings 10 and the left pressure cover 11 are stably connected, so that when the plug-in part is hit, the impact force will not be completely applied to the reducer 2, and the entire housing 1 shares the collision force through the transmission of the bearing seat 8.

[0051] Embodiment 5:

[0052] Reference Figure 1-3 and Figure 7-8 The difference of this embodiment is that: the plug-in portion includes an adjusting portion, a connecting seat 13, an adjusting seat 14 and a second spacer sleeve 15, a protrusion is opened at one end of the connecting seat 13, and a pressure groove matching the protrusion is opened at one end of the main shaft 3, the connecting seat 13 is detachably connected to the end of the main shaft 3, the protrusion is located in the pressure groove, a connecting seat through hole with the same diameter as the through hole is opened at the center of the connecting seat 13, the central shaft 4 passes through the connecting seat through hole, the adjusting seat 14 is detachably connected to the other end of the connecting seat 13, the connecting seat 13 and the adjusting seat 14 are opened at the center with square holes of the same size, the connecting seat through hole is communicated with the square hole, the adjusting portion is detachably connected in the square hole, the second spacer sleeve 15 is sleeved on the outer circumferential surface of the main shaft 3, and the two side surfaces of the second spacer sleeve 15 are respectively in contact with the connecting seat 13 and the sealing ring 10 in the bearing seat 8.

[0053] In actual use: the adjusting part is plugged into the square shaft, the main shaft 3 rotates, driving the connecting seat 13, the adjusting seat 14 and the second spacer 15 to rotate synchronously, and at the same time driving the adjusting part to rotate with the connecting seat 13 and the adjusting seat 14. When stopping, the central shaft 4 pushes the square shaft to separate from the adjusting part.

[0054] Embodiment 6:

[0055] Reference Figure 1-8 , the difference of this embodiment is that: the adjustment part includes an inner sleeve 16, an outer ring 17, a collar 18, a connecting plate 19, a spring 20 and a screw 21, the outer circumferential surface of the outer ring 17 is axially opened with an outer arc surface 22, the outer ring 17 is fixed on the outer surface of the inner sleeve 16, and the outer ring 17 is coaxial with the inner sleeve 16, a plurality of connecting plates 19 are equidistantly fixed on the outer circumferential surface of the outer ring 17, and an adjustment through hole is opened on the connecting plate 19, the opposite surfaces of the connecting seat 13 and the adjustment seat 14 are respectively equidistantly opened with a plurality of left half-slots 23 and right half-slots 24, the left half-slots 23 and the right half-slots 24 are communicated with the square hole, the left half-slots 23 and the right half-slots 24 are opened with an inner arc surface with the same curvature as the outer arc surface 22 of the outer ring 17, the opposite surfaces of the connecting seat 13 and the adjustment seat 14 are respectively equidistantly opened with left spring grooves and right spring grooves, the inner sleeve 16 is arranged on the connecting seat 13 and In the square hole of the adjustment seat 14, the outer ring 17 is located between the left half slot 23 and the right half slot 24, the connecting plate 19 is located between the left spring slot and the right spring slot, and springs are respectively arranged between the left spring slot and the right spring slot on both sides of the connecting plate 19, and the adjusting seat 14 is provided with a screw through hole, one end of the screw 21 passes through the screw through hole, the spring 20 in the right spring slot, the adjusting through hole of the connecting plate 19 and the spring 20 in the left spring slot in sequence, and then is threadedly connected to the connecting seat 13, the collar 18 is arranged between the connecting seat 13 and the adjustment seat 14, and the two side surfaces of the collar 18 are respectively in contact with the opposite surfaces of the connecting seat 13 and the adjustment seat 14, and the collar 18 is located on the outside of the connecting plate 19, the inner sleeve 16 is a square tube with a square structure, the width of the collar 18 is greater than the width of the connecting plate 19, the adjusting through hole is a long hole, and the aperture of the adjusting through hole is greater than the diameter of the screw 21.

[0056] In actual use: the inner sleeve 16 is plugged into the square shaft. When the rotation is not concentric, the inner sleeve 16 rotates with the offset under the influence of the square shaft. At the same time, the inner sleeve 16 rotates in the inner arc surface of the left half slot 23 and the right half slot 24 through the outer arc surface 22 of the outer ring 17. Since the left half slot 23 and the right half slot 24 are two parts, they are affected by the collar 18, resulting in a space with the width of the collar 18 in the middle, thereby increasing the deflection angle of the outer ring 17 and improving the self-adjustment adaptation. When the outer ring 17 deflects, the connecting plate 19 is driven to deflect, and the spring 20 in the deflection direction is squeezed according to the cheap direction, so that the spring 20 on this side stores energy. After the square shaft is separated from the inner sleeve 16, the connecting plate 19 is reset under the action of the spring 20 on this side. At the same time, by opening a long hole on the connecting plate 19, the connecting plate 19 can increase the offset angle on the screw 21.

[0057] The main shaft 3 rotates, driving the connecting seat 13, the adjusting seat 14 and the screw 21 to rotate, the screw 21 drives the connecting plate 19 to rotate, and the connecting plate 19 drives the outer ring 17 and the inner sleeve 16 to rotate. When separating, the central shaft 4 pushes the square shaft in the inner sleeve 16 to separate the square shaft from the inner sleeve 16.

[0058] In this embodiment, the inner wall surface of the collar 18 is provided with an inner arc surface with the same arc as the outer arc surface 22 of the outer ring 17, and a clearance groove is provided in the collar 18 at the position where the screw 21 passes through. The outer ring 17 contacts the inner arc surface of the collar 18, and a through hole is provided between the clearance grooves. The adjustment seat 14 is located between the screw 21 and is detachably connected with a bolt, and the bolt passes through the adjustment seat 14 and the through hole and is threadedly connected to the connecting seat 13.

[0059] When the collar 18 rotates, the side of the groove contacts the side of the connecting plate 19 , thereby pushing the connecting plate 19 to rotate, and at the same time, the outer arc surface 22 slides within the inner arc surface of the collar 18 .

[0060] The above is a detailed description of the implementation mode of the utility model in conjunction with the accompanying drawings, but the utility model is not limited to the above implementation mode. Within the knowledge scope of ordinary technicians in the field, various changes can be made without departing from the purpose of the utility model, which are all within the protection scope of this technology.

Claims

1. A winding device for a transformer winding machine, characterized in that: include: Box (1); A reducer (2), the reducer (2) being detachably connected to the housing (1); A main shaft (3), the main shaft (3) being detachably connected to the reducer (2), with both ends of the main shaft (3) extending to the outside of the reducer (2), and one end of the main shaft (3) passing through one side of the housing (1); A central shaft (4), wherein a through hole is formed at the axial center of the main shaft (3), and the central shaft (4) is located in the through hole; A pushing part, the pushing part is detachably connected to the other side of the box body (1), and the driving end of the pushing part passes through the box body (1) and is detachably connected to one end of the central shaft (4), and the other end of the central shaft (4) is the pushing end; A rotating connection part, which is detachably connected to the box body (1), and one end of the main shaft (3) passes through the rotating connection part; The plug-in portion is detachably connected to one end of the main shaft (3), and the pushing end of the central shaft (4) is located inside the plug-in portion.

2. A winding device for a transformer winding machine according to claim 1, characterized in that: Ball bushings (5) are detachably connected at both ends of the through hole in the main shaft (3), and the central shaft (4) is located in a pair of ball bushings (5).

3. A winding device for a transformer winding machine according to claim 1, characterized in that: The main shaft (3) is provided with a limiting step, the limiting step is in contact with the reducer (2), the main shaft (3) is provided with a detachable clamping nut (6), a spacer sleeve (7) is provided between the clamping nut (6) and the reducer (2), and the reducer (2) is located between the spacer sleeve (7) and the limiting step.

4. A winding device for a transformer winding machine according to claim 1, characterized in that: The rotary connection part comprises: a bearing seat (8), a bearing (9), a pair of sealing rings (10), a left pressure cover (11) and a second clamping nut (12); a mounting hole is opened on the housing (1); the bearing seat (8) is detachably connected to the mounting hole; the bearing seat (8) is embedded with a bearing (9); the main shaft (3) passes through the bearing (9) and is detachably connected to the plug-in part; one side of the bearing seat (8) is detachably connected to the left pressure cover (11); sealing rings (10) are respectively arranged on the inner circumferential surfaces of the bearing seat (8) and the left pressure cover (11) and on the outer circumferential surface of the main shaft (3); a pair of the sealing rings (10) are respectively rotatably sealed and connected to the bearing seat (8) and the left pressure cover (11); the bearing (9) is located between the pair of sealing rings (10); the main shaft (3) is detachably connected to the second clamping nut (12); one side of the second clamping nut (12) contacts the sealing ring (10) located in the left pressure cover (11).

5. A winding device for a transformer winding machine according to claim 4, characterized in that: The plug-in portion comprises an adjustment portion, a connecting seat (13), an adjustment seat (14) and a second spacer sleeve (15); a protrusion is formed at one end of the connecting seat (13); a pressure groove matching the protrusion is formed at one end of the main shaft (3); the connecting seat (13) is detachably connected to the end of the main shaft (3); the protrusion is located in the pressure groove; a connecting seat through hole having the same diameter as the through hole is formed at the center of the connecting seat (13); the central shaft (4) passes through the connecting seat through hole; the adjustment seat (14) is detachably connected to the other end of the connecting seat (13); square holes of the same size are formed at the centers of the connecting seat (13) and the adjustment seat (14); the connecting seat through hole communicates with the square hole; the adjustment portion is detachably connected in the square hole; the second spacer sleeve (15) is sleeved on the outer circumferential surface of the main shaft (3); and the two side surfaces of the second spacer sleeve (15) are respectively in contact with the connecting seat (13) and the sealing ring (10) in the bearing seat (8).

6. A winding device for a transformer winding machine according to claim 5, characterized in that: The adjusting portion comprises an inner sleeve (16), an outer ring (17), a collar (18), a connecting plate (19), a spring (20) and a screw (21); an outer circumferential surface of the outer ring (17) is axially provided with an outer arc surface (22); the outer ring (17) is fixed to the outer surface of the inner sleeve (16), and the outer ring (17) and the inner sleeve (16) are coaxial; a plurality of connecting plates (19) are equidistantly fixed to the outer circumferential surface of the outer ring (17); the connecting plates (19) are provided with adjusting holes; the connecting seat (13) A plurality of left half-slots (23) and right half-slots (24) are respectively formed at equal distances on the surfaces opposite to the adjusting seat (14); the left half-slots (23) and the right half-slots (24) are communicated with the square hole; the left half-slots (23) and the right half-slots (24) have inner arc surfaces with the same arc as the outer arc surface (22) of the outer ring (17); the left spring slots and the right spring slots are respectively formed at equal distances on the surfaces opposite to the connecting seat (13) and the adjusting seat (14); the inner sleeve (16) is arranged between the connecting seat (13) and the adjusting seat (14); The outer ring (17) is located in the square hole of the whole seat (14), between the left half slot (23) and the right half slot (24), the connecting plate (19) is located between the left spring slot and the right spring slot, and springs are arranged between the left spring slot and the right spring slot on both sides of the connecting plate (19), and the adjusting seat (14) is provided with a screw hole, and one end of the screw (21) passes through the screw hole, the spring (20) in the right spring slot, the adjusting hole of the connecting plate (19) and the spring (21) in the left spring slot in sequence. 0) is then threadedly connected to the connecting seat (13), the collar (18) is arranged between the connecting seat (13) and the adjusting seat (14), and the two side surfaces of the collar (18) are respectively in contact with the opposite surfaces of the connecting seat (13) and the adjusting seat (14), and the collar (18) is located outside the connecting plate (19), the inner sleeve (16) is a square tube with a square structure, the width of the collar (18) is greater than the width of the connecting plate (19), the adjusting through hole is a long hole, and the aperture of the adjusting through hole is greater than the diameter of the screw rod (21).

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