A bottle packaging and transportation line

Abstract

The present application relates to a bottle packaging and transportation line, and relates to the technical field of bottle conveying devices, including a plurality of conveying devices and a transfer device located between two adjacent conveying devices; the conveying device includes a frame, rotating rollers rotatably arranged at both ends of the frame, a conveyor belt wound around the rotating rollers, and a driving member for driving at least one of the rotating rollers to rotate, and the surface of the conveyor belt is provided with a plurality of limiting holes for inserting bottles; the transfer device is used to transfer bottles on one conveyor belt to the next conveyor belt. The insertion of the bottle into the limiting hole is conducive to limiting the movement of the bottle relative to the conveyor belt along the length direction of the conveyor belt, so as to reduce the possibility of the bottle slipping during the conveying process, thereby helping to reduce the risk of the bottle breaking due to contact and pushing between the bottles.

Description

Technical Field

[0001] The present application relates to the technical field of bottle conveying devices, and in particular to a bottle packaging and transportation line. Background Art

[0002] Before filling the bottle, the bottle needs to be transported through a conveying device to pass through cleaning, high-temperature drying and other stations in sequence to clean the bottle and prepare for filling the material into the bottle.

[0003] When conveying bottles, they are generally placed on a stainless steel conveyor mesh belt. The friction between the bottles and the stainless steel conveyor mesh belt makes the bottles move along with the stainless steel conveyor mesh belt, so that the stainless steel conveyor mesh belt drives the bottles to move, allowing the bottles to pass through the relevant workstations in sequence.

[0004] Regarding the above-mentioned related technologies, when the bottles move with the stainless steel mesh belt, slippage is likely to occur between the bottles and the stainless steel mesh belt, resulting in contact and push between adjacent bottles, which may lead to the possibility of bottle rupture. Summary of the Invention

[0005] The purpose of the present application is to provide a bottle packaging and transportation line to reduce the possibility of bottle slippage, thereby improving the problem of bottle breakage during transportation.

[0006] The bottle packaging and transportation line provided in this application adopts the following technical solution:

[0007] A bottle packaging and transportation line includes several conveying devices and a transfer device located between two adjacent conveying devices; the conveying devices include a frame, rotating rollers rotatably arranged at both ends of the frame, a conveyor belt wrapped around the rotating rollers, and a driving member for driving at least one of the rotating rollers to rotate, and the surface of the conveyor belt is provided with several limiting holes for inserting bottles; the transfer device is used to transfer bottles on one conveyor belt to the next conveyor belt.

[0008] By adopting the above technical solution, when conveying bottles, the bottles are inserted into the limiting holes; the driving member drives the rotating roller to rotate, so that the rotating roller drives the conveyor belt to move, and the conveyor belt thus drives the bottles to move. The bottles inserted into the limiting holes help limit the movement of the bottles relative to the conveyor belt along the length of the conveyor belt, thereby reducing the possibility of the bottles slipping during conveyance, thereby reducing the risk of bottles breaking due to contact and friction between the bottles.

[0009] Optionally, the conveyor belt is made of a flexible material; the transfer device includes an adapter plate for receiving the bottle body, and the adapter plate is connected to the frame; the upper surface of the adapter plate is flush with the bottom wall of the limiting hole.

[0010] By adopting the above technical solution, the conveyor belt is made of a flexible material. When the bottle moves along the conveyor belt to the position of the rotating roller, the conveyor belt bends downward with the rotating roller to expose the lower surface of the bottle, thereby allowing the lower surface of the bottle to contact the upper surface of the transfer plate, allowing the bottle to move onto the transfer plate. As subsequent bottles continue to move onto the transfer plate, the bottles push against each other, causing them to automatically move to the next conveyor belt. During the process of the bottle moving from the transfer plate to the next conveyor belt, if the bottle is located on the upper surface of the conveyor belt and slips, the bottle can automatically move to the rear of the conveyor belt relative to the conveyor belt, allowing the bottle to automatically move into the corresponding limit hole, thereby reducing the possibility of contact and pushing between bottles, which may cause breakage.

[0011] Compared with the technical solutions in the related art, although the bottles on the adapter plate may contact and push against each other, the number of bottles on the adapter plate is smaller, the force between the bottles is smaller, and the risk of bottle breakage is lower.

[0012] Optionally, the limiting holes are distributed in multiple groups along the width direction of the conveyor belt, and all the limiting holes in each group are arranged in sequence at intervals along the length direction of the conveyor belt; the frame is provided with limiting strips on both sides of each group of limiting holes along the width direction of the conveyor belt, and the limiting strips are used to abut against the outer peripheral wall of the bottle body.

[0013] By adopting the above solution, the limiting strip can limit the movement of the bottle body along the width direction of the conveyor belt, so that the bottle body that slips can automatically move along the length direction of the conveyor belt to the corresponding limiting hole.

[0014] Optionally, the frame is provided with an abutment rod for abutting against the outer peripheral wall of the upper end of the bottle body on the upper surface of the conveyor belt, and the abutment rod is located above the bottle body in the limiting hole.

[0015] By adopting the above technical solution, when the conveyor belt transports the bottle body, when the bottle body is on the upper surface of the conveyor belt, the corresponding outer peripheral wall of the bottle body can abut against the abutment rod, so that the bottle body can slide relative to the conveyor belt, thereby allowing the bottle body to be aligned with the limiting hole, and the bottle body can be automatically and quickly inserted into the limiting hole.

[0016] Optionally, the transfer device includes a transfer plate, several adsorption parts connected to the transfer plate, and a switching component for driving the transfer plate to move from the discharge end of one conveyor belt to the loading end of another adjacent conveyor belt, and the adsorption parts are used to adsorb the bottle bodies.

[0017] By adopting the above technical solution, the adsorption part can adsorb the corresponding bottle body; when the switching component drives the transfer plate to move, the transfer plate can drive the corresponding multiple bottles to move, so as to transfer all the corresponding bottles to another adjacent conveyor belt, and the transfer efficiency is high.

[0018] Optionally, the switching assembly includes a base, a rotating frame rotatably connected to the base, a rotating member for driving the rotating frame to rotate, a sliding seat connected to the rotating frame for sliding along the up and down directions, and a sliding member for driving the sliding seat to slide; the sliding member is connected to the rotating frame, and the transfer plate is connected to the sliding seat.

[0019] By adopting the above technical solution, the rotating member drives the rotating frame to rotate, so that the rotating frame drives the transfer plate to move back and forth between the corresponding two conveyor belts.

[0020] Optionally, the rotating frame includes a rotating bracket, a rotating bracket rotatably connected to the rotating bracket, and a rotating member for driving the rotating bracket to rotate, and the rotating member is connected to the rotating bracket; the sliding seat is slidably connected to the rotating bracket along the up and down directions, and the sliding member is connected to the rotating bracket.

[0021] By adopting the above technical solution, the rotating member can drive the rotating bracket to rotate so that the adsorption member is aligned with the corresponding conveyor belt, which is conducive to adjusting the relative position between two adjacent conveyor belts according to site conditions and facilitating the improvement of the scope of application.

[0022] Optionally, the rotating member includes a fixed gear connected to the base and a connecting gear rotatably connected to the rotating bracket, and the connecting gear is engaged with the fixed gear; the fixed gear is coaxial with the rotating shaft of the rotating bracket, and the rotating shaft of the connecting gear is connected to the rotating shaft of the rotating bracket.

[0023] By adopting the above technical solution, the connecting gear meshes with the fixed gear. When the rotating bracket rotates, the connecting gear automatically rotates, driving the rotating bracket to rotate synchronously. When the rotating bracket reverses, the rotating bracket automatically resets. The meshing of the connecting gear and the fixed gear ensures stable operation and accurate positioning.

[0024] Optionally, a vent hole is provided through the bottom wall of the limiting hole.

[0025] By adopting the above technical solution and providing the vent hole, the possibility of negative pressure being generated between the bottle body and the bottom wall of the limiting hole is reduced, thereby facilitating the separation of the bottle body from the limiting hole.

[0026] Optionally, an inner side wall of the limiting hole is provided with a ventilation groove communicating with the ventilation hole, and the inner side wall of the ventilation groove is connected to the surface of the conveyor belt.

[0027] By adopting this technical solution, the ventilation groove can further reduce the possibility of negative pressure between the bottle body and the inner wall of the limiting hole, further facilitating the separation of the bottle body from the limiting hole. At the same time, water on the surface of the conveyor belt and in the limiting hole can flow out through the ventilation groove and the ventilation hole, keeping the surface of the conveyor belt dry, thereby reducing the risk of negative pressure between the bottle body and the conveyor belt, which may make it difficult to separate the bottle from the conveyor belt.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The bottle body is inserted into the limiting hole, which helps to limit the movement of the bottle body relative to the conveyor belt along the length direction of the conveyor belt, thereby reducing the possibility of the bottle body slipping during transportation, thereby helping to reduce the risk of the bottle body breaking due to contact and pushing between the bottles;

[0030] 2. The transfer plate and the limit strip cooperate with each other to allow the bottle to be transferred from one conveyor belt to another adjacent conveyor belt, with a simple structure and accurate positioning;

[0031] 3. The connecting gear is engaged with the fixed gear. When the rotating bracket rotates, the connecting gear can automatically rotate to drive the rotating bracket to rotate synchronously; when the rotating bracket reverses, the rotating bracket can automatically reset; the operation is stable and the positioning is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the overall structure of Example 1 of a bottle packaging and transportation line of the present application.

[0033] Figure 2 yes Figure 1 Enlarged view of part A in .

[0034] Figure 3 yes Figure 1 Enlarged view of part B in .

[0035] Figure 4 This is a schematic diagram of the overall structure of Example 2 of a bottle packaging and transportation line of the present application.

[0036] Figure 5 yes Figure 4 Enlarged view of part C in .

[0037] Figure 6 This is a schematic diagram for illustrating the structure of the transfer device in Example 2.

[0038] In the figure, 1. conveying device; 11. frame; 12. rotating roller; 13. conveyor belt; 131. limiting hole; 1311. vent hole; 1312. vent groove; 14. driving member; 15. support plate; 151. drain groove; 16. support frame; 161. mounting sleeve; 1611. fixing screw hole; 1612. fixing screw; 17. limiting strip; 18. abutting rod; 181. mounting rod; 2. transfer device; 3. adapter plate; 3 1. Connecting frame; 4. Transfer plate; 5. Adsorption member; 6. Switching assembly; 61. Base; 611. Fixed shaft; 62. Rotating frame; 621. Rotating bracket; 6211. Driving gear; 622. Rotating bracket; 623. Rotating member; 6231. Fixed gear; 6232. Connecting gear; 63. Rotating member; 631. Rotating motor; 632. Driving gear; 633. Driven gear; 64. Sliding seat; 65. Sliding member. DETAILED DESCRIPTION

[0039] The following is combined with Figure 1 -Attached Figure 6 , further details of this application are given.

[0040] Example 1

[0041] A bottle packaging and transportation line, referring to Figure 1 , including a conveying device 1 and a transfer device 2. The conveying device 1 is used to convey bottles, and there are multiple conveying devices 1. The transfer device 2 is arranged between two adjacent conveying devices 1 to transfer the bottles on one of the conveying devices 1 to another adjacent conveying device 1.

[0042] Reference Figure 1 and Figure 2 The conveying device 1 includes a frame 11, rotating rollers 12, a conveyor belt 13, and a drive member 14. There are two rotating rollers 12, one of which is rotatably connected to one end of the frame 11, and the other is rotatably connected to the other end of the frame 11. The conveyor belt 13 is wound around the two rotating rollers 12. The drive member 14 includes a motor. The drive member 14 is fixedly connected to the frame 11, and the output shaft of the drive member 14 is connected to one of the rotating rollers 12 to drive the corresponding rotating roller 12 to rotate, thereby driving the conveyor belt 13 to move (the X direction in the figure is the direction of bottle movement). In this embodiment, a support plate 15 is welded to the frame 11 between the two rotating rollers 12. The upper surface of the support plate 15 is provided with a drain groove 151 extending along the width of the conveyor belt 13. The upper surface of the support plate 15 is in contact with the lower surface of the upper layer of the conveyor belt 13 to support the conveyor belt 13 and thus the bottles.

[0043] Reference Figure 1 and Figure 2The conveyor belt 13 is made of fluororubber; the surface of the conveyor belt 13 is integrally formed with limiting holes 131, and the limiting holes 131 are arranged in a plurality of groups in sequence along the width direction of the conveyor belt 13, and the limiting holes 131 in each group are arranged in sequence along the length direction of the conveyor belt 13; the distance between any two adjacent limiting holes 131 in each group is smaller than the diameter of the limiting hole 131. The bottles are inserted into the limiting holes 131 so that the conveyor belt 13 can drive the bottles to move synchronously, thereby keeping the bottles on the conveyor belt 13 separated from each other, and reducing the possibility of the bottles slipping and contacting each other. In another embodiment, the material of the conveyor belt 13 can also be one of ethylene propylene rubber, silicone rubber, butyl rubber, and nitrile rubber. The material of the conveyor belt 13 can also be other types of flexible materials.

[0044] Reference Figure 1 and Figure 2 The transfer device 2 includes an adapter plate 3, with a connecting bracket 31 welded to its lower surface. The connecting bracket 31 is bolted to the frame 11, ensuring that the upper surface of the adapter plate 3 is flush with the bottom wall of the stop hole 131. When the bottle moves along the conveyor belt 13 to the rotating roller 12 near the adapter plate 3, the conveyor belt 13 bends along the circumferential wall of the rotating roller 12, allowing the bottle to automatically move onto the adapter plate 3. A vent hole 1311 is integrally formed along the bottom wall of the stop hole 131, extending through the depth of the stop hole 131. A vent groove 1312 is integrally formed on the inner sidewall of the stop hole 131. The inner sidewall of the vent groove 1312 is connected to the inner sidewall of the vent hole 1311 and the surface of the conveyor belt 13. This reduces the possibility of negative pressure between the bottom wall of the bottle and the bottom wall of the stop hole 131, thereby facilitating the separation of the bottle from the conveyor belt 13 and facilitating the bottle's transfer to the transfer plate 4.

[0045] Reference Figure 1 and Figure 3 , a support frame 16 is welded and fixed to the frame 11, and the support frame 16 is located above the conveyor belt 13. A limit strip 17 is provided on both sides of each set of limit holes 131 along the width direction of the conveyor belt 13, and the limit strip 17 is welded and fixed to the support frame 16; the limit strip 17 extends from one end close to the adapter plate 3 to a position above the adapter plate 3. The limit strip 17 is used to abut against the outer peripheral wall of the bottle body to limit the movement of the bottle body along the width direction of the conveyor belt 13, thereby facilitating the alignment of the bottle body with the limit hole 131 on the next conveyor belt 13. In this embodiment, the two limit strips 17 located between two adjacent sets of limit holes 131 are integrally formed.

[0046] Reference Figure 1 and Figure 3The frame 11 is provided with an abutment rod 18 at a position near the adapter plate 3 and at the feeding end of the conveyor belt 13. The length direction of the abutment rod 18 is arranged along the width direction of the conveyor belt 13. The support frame 16 is welded with a mounting sleeve 161, and the abutment rod 18 is welded with a mounting rod 181 extending upward and inserted into the mounting sleeve 161. The mounting sleeve 161 is penetrated by a fixing screw hole 1611, and the inner side wall of the fixing screw hole 1611 is threadedly connected with a fixing screw 1612. The end wall of the fixing screw 1612 abuts against the peripheral wall of the mounting rod 181 to fix the mounting rod 181, so that the abutment rod 18 can be located between the upper end wall of the bottle body on the upper surface of the conveyor belt 13 and the upper end wall of the bottle body located in the limiting hole 131. When the bottle moves along the conveyor belt 13 , the abutment rod 18 can abut against the outer peripheral wall of the bottle on the upper surface of the conveyor belt 13 to make the bottle slip relative to the conveyor belt 13 , thereby allowing the bottle to automatically move into the corresponding limiting hole 131 .

[0047] The implementation principle of the embodiment of this application is:

[0048] When conveying the bottle, the bottle is inserted into the limiting hole 131, and the conveyor belt 13 can drive the bottle to move; when the bottle moves to the discharge end of the conveyor belt 13, the bottle can automatically move to the transfer plate 3, and the bottles on the transfer plate 3 push each other so that the bottle can automatically move to another adjacent conveyor belt 13.

[0049] The bottle body cooperates with the limiting hole 131, which helps to reduce the possibility of the bottle body slipping relative to the conveyor belt 13, thereby helping to reduce the possibility of the bottles on the conveyor belt 13 contacting and pushing each other, thereby helping to reduce the risk of the bottle body breaking during the conveying process.

[0050] Example 2

[0051] The difference between this embodiment and embodiment 1 is that:

[0052] Reference Figure 4 and Figure 5The transfer device 2 includes a transfer plate 4, an adsorption member 5 and a switching assembly 6. The adsorption member 5 includes a vacuum suction cup; the adsorption member 5 is fixedly mounted on the lower surface of the transfer plate 4, and the number of the adsorption members 5 is multiple, and the adsorption member 5 is used to correspond one-to-one with the bottle body located at the discharge end of the conveyor belt 13, so that the adsorption member 5 can be adsorbed and fixed to the upper end wall of the corresponding bottle body, thereby allowing the bottle body to be fixed to the transfer plate 4. The switching assembly 6 is used to drive the transfer plate 4 to move from the discharge end of one of the conveyor belts 13 to the loading end of another adjacent conveyor belt 13, so that the corresponding bottle body can be moved to the corresponding other conveyor belt 13. The conveyor belt 13 in this embodiment is the same as the conveyor belt 13 in Example 1; in another embodiment, the conveyor belt 13 can also be a stainless steel chain plate, and the limiting hole 131 is opened on the surface of the stainless steel chain plate, and the corresponding sprocket is connected to the rotating roller 12, so that the rotating roller 12 drives the sprocket to rotate, so that the chain plate drives the bottle body to move.

[0053] Reference Figure 4 and Figure 6 The switching assembly 6 includes a base 61, a rotating frame 62, a rotating member 63, a sliding seat 64, and a sliding member 65. The rotating frame 62 includes a rotating bracket 621, a rotating bracket 622, and a rotating member 623. The base 61 is welded with an upwardly extending fixed shaft 611. The rotating bracket 621 is sleeved on the fixed shaft 611 and is rotatably connected to the fixed shaft 611 via a bearing. The rotating member 63 includes a rotating motor 631, a driving gear 632 connected to the output shaft of the rotating motor 631, and a driven gear 633 fixedly connected to the rotating bracket 621. The rotating motor 631 is fixed to the base 61 by bolts, so that the driving gear 632 drives the driven gear 633 to rotate, thereby rotating the rotating bracket 621.

[0054] Reference Figure 5 and Figure 6 The rotating bracket 622 is rotatably connected to the rotating bracket 621 via a bearing. The sliding member 65 includes a cylinder, the cylinder of the sliding member 65 is fixed to the rotating bracket 622, and the sliding seat 64 is connected to the piston rod of the sliding member 65 via bolts. The transfer plate 4 is also fixedly connected to the sliding seat 64 via bolts, so that the sliding member 65 can drive the transfer plate 4 to move in the vertical direction to remove the bottle from the limiting hole 131 or insert the bottle into the limiting hole 131. The rotating member 623 is used to drive the rotating bracket 622 to rotate, thereby allowing the bottle on the transfer plate 4 to align with the limiting hole 131 on the other conveyor belt 13. In another embodiment, the switching assembly 6 can also be an industrial robot.

[0055] Reference Figure 6The rotating member 623 includes a fixed gear 6231 and a connecting gear 6232. The fixed gear 6231 is fixedly connected to the fixed shaft 611. The connecting gear 6232 is rotatably connected to the rotating bracket 621 and meshes with the fixed gear 6231, allowing the connecting gear 6232 to rotate relative to the rotating bracket 621 as the rotating bracket 621 rotates. The rotating bracket 621 is rotatably connected to a drive gear 6211, which meshes with the connecting gear 6232. The drive gear 6211 is connected to the rotating bracket 622 via a synchronous belt drive (the synchronous belt and the teeth of the synchronous belt pulley are not shown in the figure), allowing the connecting gear 6232 to drive the rotating bracket 622 to rotate. By adjusting the number of teeth on the drive gear 6211 or the connecting gear 6232, the relative position of two adjacent conveyor belts 13 can be adjusted to suit the layout of the installation site. In another embodiment, the rotating member 623 can also be a motor, with the output shaft of the motor connected to the rotating bracket 622.

[0056] The implementation principle of the embodiment of this application is:

[0057] After the rotating bracket 621 drives the transfer plate 4 to move to a position above the discharge end of the conveyor belt 13, the sliding member 65 drives the sliding seat 64 to move downward, so that the transfer plate 4 can move downward to allow the adsorption member 5 to contact the bottle body to adsorb the bottle body; then, the sliding member 65 drives the sliding seat 64 to move upward; when the bottle body is disengaged from the limiting hole 131, the rotating bracket 621 rotates to move the transfer plate 4 to a position directly above the feeding end of another conveyor belt 13, and then the transfer plate 4 moves downward; when the bottle body is inserted into the corresponding limiting hole 131, the transfer plate 4 moves upward to transfer the bottle body again.

[0058] Compared with Example 1, in this embodiment, multiple bottles can be transferred at a time, and the transfer efficiency and accuracy are higher.

[0059] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A bottle packaging and transport line, comprising a plurality of conveying devices (1) and a transfer device (2) located between two adjacent conveying devices (1); characterized in that: The conveying device (1) comprises a frame (11), rotating rollers (12) rotatably arranged at both ends of the frame (11), a conveyor belt (13) wound around the rotating rollers (12), and a driving member (14) for driving at least one of the rotating rollers (12) to rotate, and a surface of the conveyor belt (13) is provided with a plurality of limiting holes (131) for inserting bottles; the transfer device (2) is used to transfer bottles on one conveyor belt (13) to the next conveyor belt (13); The conveyor belt (13) is made of a flexible material; the transfer device (2) includes a transfer plate (3) for receiving the bottle body, and the transfer plate (3) is connected to the frame (11); the upper surface of the transfer plate (3) is flush with the bottom wall of the limiting hole (131); The limiting holes (131) are sequentially distributed in a plurality of groups along the width direction of the conveyor belt (13), and all the limiting holes (131) in each group are sequentially spaced along the length direction of the conveyor belt (13); the frame (11) is provided with limiting strips (17) at positions on both sides of each group of limiting holes (131) along the width direction of the conveyor belt (13), and the limiting strips (17) are used to abut against the outer peripheral wall of the bottle body; The frame (11) is provided with an abutment rod (18) for abutting against the outer peripheral wall of the upper end of the bottle body on the upper surface of the conveyor belt (13), and the abutment rod (18) is located above the bottle body in the limiting hole (131); A vent hole (1311) is provided through the bottom wall of the limiting hole (131); The inner side wall of the limiting hole (131) is provided with a ventilation groove (1312) communicating with the ventilation hole (1311), and the inner side wall of the ventilation groove (1312) is connected to the surface of the conveyor belt (13).

2. The bottle packaging and transportation line according to claim 1, characterized in that: The transfer device (2) comprises a transfer plate (4), a plurality of adsorption members (5) connected to the transfer plate (4), and a switching assembly (6) for driving the transfer plate (4) to move from the discharge end of one conveyor belt (13) to the loading end of another adjacent conveyor belt (13), wherein the adsorption members (5) are used to adsorb the bottle bodies.

3. The bottle packaging and transportation line according to claim 2, characterized in that: The switching assembly (6) comprises a base (61), a rotating frame (62) rotatably connected to the base (61), a rotating member (63) for driving the rotating frame (62) to rotate, a sliding seat (64) slidably connected to the rotating frame (62) in an up-down direction, and a sliding member (65) for driving the sliding seat (64) to slide; the sliding member (65) is connected to the rotating frame (62), and the transfer plate (4) is connected to the sliding seat (64).

4. The bottle packaging and transportation line according to claim 3, characterized in that: The rotating frame (62) comprises a rotating bracket (621), a rotating bracket (622) rotatably connected to the rotating bracket (621), and a rotating member (623) for driving the rotating bracket (622) to rotate, wherein the rotating member (623) is connected to the rotating bracket (621); the sliding seat (64) is slidably connected to the rotating bracket (622) in the up-down direction, and the sliding member (65) is connected to the rotating bracket (622).

5. The bottle packaging and transportation line according to claim 4, characterized in that: The rotating member (623) comprises a fixed gear (6231) connected to the base (61) and a connecting gear (6232) rotatably connected to the rotating bracket (621), wherein the connecting gear (6232) meshes with the fixed gear (6231); the fixed gear (6231) is coaxial with the rotating shaft of the rotating bracket (621), and the rotating shaft of the connecting gear (6232) is connected to the rotating shaft of the rotating bracket (622).

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