Rotary table mechanism of multi-channel automatic polishing machine

Abstract

The utility model relates to the technical field of automatic polishing, and discloses a multi-channel automatic polishing machine turntable mechanism, which is used for rotating to drive each clamping mechanism to pass through a loading and unloading station and a plurality of polishing stations, is compact in structural arrangement, and realizes the switching of workpieces on different stations through the rotation of the turntable mechanism. A worker can place a workpiece needing to be polished on the clamping mechanism which stops at the loading and unloading station, and meanwhile, the clamping mechanisms which stop at other stations can correspondingly carry out relevant polishing treatment without shutdown, so that the working efficiency is improved; the large rotating disc rotates to drive the clamping mechanisms to rotate around the rotating shaft of the large rotating disc, and displacement switching of workpieces on different stations is achieved. Besides, the small rotating disc can rotate around the rotating shaft of the small rotating disc under the driving of the corresponding second driving source, so that the angle position of the workpiece clamped by the clamping mechanism on the small rotating disc relative to the corresponding polishing mechanism can be further adjusted, and more comprehensive polishing processing treatment on the corresponding workpiece is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic polishing, in particular to a turntable mechanism of a multi-channel automatic polishing machine. Background Art

[0002] Automatic polishing machine is an automated equipment used for metal surface polishing. It uses a rotating disc to achieve high-speed grinding and polishing of the workpiece surface.

[0003] The existing multi-channel automatic polishing machine has only one rotating large turntable, which cannot perform comprehensive polishing on some parts and components, and has low polishing efficiency. Utility Model Content

[0004] Based on the above, the purpose of the utility model is to provide a turntable mechanism of a multi-channel automatic polishing machine, which can effectively perform multi-faceted polishing and improve polishing efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a multi-channel automatic polishing machine turntable mechanism, comprising:

[0007] abutment;

[0008] A polishing mechanism is arranged on the base platform;

[0009] A rotating disk mechanism is rotatably disposed on the base;

[0010] A plurality of clamping mechanisms are arranged in a circular array around the rotating axis of the rotating disk mechanism and are disposed on the rotating disk mechanism;

[0011] The rotating disk mechanism is used to rotate and drive each of the clamping mechanisms to pass through the upper unloading station and a plurality of polishing stations;

[0012] The rotating disk mechanism comprises:

[0013] A large turntable rotatably disposed on the base;

[0014] A first driving source is fixed to the base and is drivingly connected to the large turntable;

[0015] A plurality of small turntables are arranged in a circular array around the rotating axis of the rotating disk mechanism and can be rotatably disposed on the large turntable, and each of the small turntables is respectively provided with a clamping mechanism;

[0016] A plurality of second driving sources are fixed to the large turntable, and each of the second driving sources is respectively connected to each of the small turntables in a one-to-one driving manner so as to drive each of the small turntables to rotate around its own rotation axis.

[0017] Preferably, the clamping mechanism includes a support base, a chuck and a pull rod assembly. The support base includes a supporting surface for supporting the main body portion and a reduced-diameter hole penetrating the supporting surface. The chuck is movably arranged in the reduced-diameter hole and is provided with a clamping hole for inserting the convex column portion. The chuck can reciprocate axially along the reduced-diameter hole between a clamping position and a release position. The clamping hole can be reduced in diameter and deformed at the clamping position to clamp the convex column portion and expanded in diameter and deformed at the release position to release the convex column portion. The pull rod assembly is connected to the chuck and is used to elastically pull the chuck to reset to the clamping position.

[0018] Preferably, the pull rod assembly includes:

[0019] An elastic reset member;

[0020] A pull rod, connected to the chuck. The elastic reset member is connected to the pull rod and is used to pull the pull rod by using elastic potential energy to drive the chuck to reset to the clamping position.

[0021] Preferably, the elastic reset member is an elastic compression spring. The elastic compression spring is sleeved on the pull rod. The pull rod penetrates through one end of the support base facing away from the supporting surface.

[0022] Wherein, one end of the elastic compression spring abuts against one end of the support base facing away from the supporting surface, and the other end is connected to the pull rod. Or, a limit nut is sleeved on the pull rod. One end of the elastic compression spring abuts against one end of the support base facing away from the supporting surface, and the other end abuts against the limit nut.

[0023] Preferably, there are multiple polishing mechanisms. The multiple polishing mechanisms are respectively arranged on the base and are respectively located on one side of each polishing station one by one; and / or,

[0024] The multi-channel automatic polishing machine turntable mechanism further includes multiple rotation number detection parts. Each small turntable is provided with one of the rotation number detection parts for detecting the rotation number of the corresponding small turntable one by one; and / or,

[0025] The multi-channel automatic polishing machine turntable mechanism further includes an outer box body and a wire guiding tube fixedly connected to the inner top of the outer box body. The base, the clamping mechanism, the polishing mechanism and the rotating disc mechanism are all located inside the outer box body. The wire guiding tube is coaxially and suspended above the large turntable. The large turntable is provided with a wire passing hole facing the wire guiding tube. The wire guiding tube is used to guide the circuit to pass through the wire passing hole from top to bottom.

[0026] The beneficial effects of the present utility model are:

[0027] (1) The rotary disk mechanism of the present utility model is used to drive each clamping mechanism to rotate through the loading / unloading station and several polishing stations. The structural layout is compact, and the switching of workpieces at different stations is realized by the rotation of the rotary disk mechanism. Workers can place the workpieces to be polished on the clamping mechanism parked at the loading / unloading station, and at the same time, the clamping mechanisms parked at other stations can perform relevant polishing processes without stopping the machine, improving work efficiency;

[0028] (2) The rotation of the large rotary disk drives all the clamping mechanisms to rotate around the rotating shaft of the large rotary disk, realizing the displacement switching of workpieces at different stations. In addition, the small rotary disk itself can also rotate around its own rotating shaft under the drive of the corresponding second driving source, and further adjust the angular position of the workpiece clamped by the clamping mechanism on the small rotary disk relative to the corresponding polishing mechanism, realizing a more comprehensive polishing process for the corresponding workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the content of the embodiments of the present utility model and these drawings.

[0030] Figure 1 Schematic diagram of the structural relationship among the rotary disk mechanism, clamping mechanism and pressing mechanism of the rotary disk mechanism of the multi-channel automatic polishing machine provided for some embodiments of the present utility model;

[0031] Figure 2 Schematic diagram of the transmission and cooperation between the second driving source and the small rotary disk of the rotary disk mechanism of the multi-channel automatic polishing machine provided for some embodiments of the present utility model;

[0032] Figure 3 Stereo schematic of the multi-channel automatic polishing machine provided for some embodiments of the present utility model Figure 1 ;

[0033] Figure 4 Stereo schematic of the multi-channel automatic polishing machine provided for some embodiments of the present utility model Figure 2 ;

[0034] Figure 5 Stereo schematic of the multi-channel automatic polishing machine with the outer box removed provided for some embodiments of the present utility model Figure 1 ;

[0035] Figure 6 Stereo schematic of the multi-channel automatic polishing machine with the outer box removed provided for some embodiments of the present utility modelFigure 2 ;

[0036] Figure 7 Schematic three - dimensional view of the multi - channel automatic polishing machine provided for some embodiments of the present utility model, with the outer box body hidden Figure 3 ;

[0037] Figure 8 Schematic three - dimensional view of multiple clamping mechanisms of the multi - channel automatic polishing machine provided for some embodiments of the present utility model;

[0038] Figure 9 Cross - sectional view of the workpiece to be polished.

[0039] In the figure:

[0040] 100, workpiece; 110, main body part; 120, convex column part; 130, convex handle part;

[0041] 1, base;

[0042] 2, clamping mechanism; 21, support seat; 211, supporting surface; 212, reduced - diameter hole; 22, chuck; 23, pull - rod assembly; 231, elastic resetting member; 232, pull - rod; 233, limit nut;

[0043] 3, polishing mechanism;

[0044] 4, rotating disk mechanism; 41, large turntable; 42, first driving source; 43, small turntable; 44, second driving source; 45, rotation times detection member; 46, first bevel gear; 47, second bevel gear; 48, planetary gear; 49, internal gear ring;

[0045] 5, pushing mechanism; 51, displacement driving source; 52, pusher;

[0046] 6, outer box body;

[0047] 7, wire - running pipe. Detailed implementation manners

[0048] To make the technical problems solved by the present utility model, the technical solutions adopted and the achieved technical effects clearer, the technical solutions of the embodiments of the present utility model will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.

[0049] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0050] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0051] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0052] As Figure 9 shown, it is a cross-sectional view of a workpiece 100 that needs to be polished. Specifically, the workpiece 100 includes an integrally formed main body portion 110 and a convex column portion 120. The convex column portion 120 is coaxial with the main body portion 110 and protrudes from the main body portion 110. In addition, it further includes a convex handle portion 130, and the convex handle portion 130 protrudes from one end of the main body portion 110 opposite to the convex column portion 120. Such workpieces 100 are commonly knob-like fittings. The main polished part of such workpieces 100 mainly includes the surface of the side of the main body portion 110 facing away from the convex column portion 120.

[0053] As Figures 1 to 8As shown, the embodiment of the utility model provides a multi-channel automatic polishing machine turntable mechanism, including: a base 1; a polishing mechanism 3, arranged on the base 1; a rotating disk mechanism 4, rotatably arranged on the base 1; a plurality of clamping mechanisms 2 arranged in a circular array around the rotating axis of the rotating disk mechanism 4 and arranged on the rotating disk mechanism 4; the rotating disk mechanism 4 is used to rotate and drive each clamping mechanism 2 to pass through the upper unloading station and several polishing stations, and the structure is compactly arranged, and the workpiece 100 is switched between different stations by rotating the rotating disk mechanism 4. The staff can put the workpiece 100 that needs to be polished on the clamping mechanism 2 parked at the upper unloading station, and the corresponding clamping mechanisms 2 parked at other stations can perform related polishing processing without stopping the machine, thereby improving work efficiency.

[0054] The rotating disk mechanism 4 includes a large rotating disk 41, a first driving source 42, a plurality of small rotating disks 43 and a plurality of second driving sources 44. The large rotating disk 41 is rotatably arranged on the base 1; the first driving source 42 is fixed to the base 1 and is connected to the large rotating disk 41 in a transmission manner; a plurality of small rotating disks 43 are arranged in a circular array around the rotating axis of the rotating disk mechanism 4 and are rotatably arranged on the large rotating disk 41, and each small rotating disk 43 is respectively provided with a clamping mechanism 2; a plurality of second driving sources 44 are fixed to the large rotating disk 41, and each second driving source 44 is respectively connected to each small rotating disk 43 in a one-to-one driving manner to drive each small rotating disk 43 to rotate around its own rotating axis. Then, the rotation of the large rotating disk 41 drives the used clamping mechanism 2 to rotate around the rotating axis of the large rotating disk 41, so as to realize the displacement switching of the workpiece 100 at different workstations. In addition, the small turntable 43 itself can also rotate around the rotation axis of the small turntable 43 itself under the drive of the corresponding second driving source 44, and then the angular position of the workpiece 100 clamped by the clamping mechanism 2 on the small turntable 43 relative to the corresponding polishing mechanism 3 can be further adjusted to achieve a more comprehensive polishing process for the corresponding workpiece 100. Specifically, the second driving source 44 can be a linear motor, and the small turntable 43 and the second driving source 44 can be connected by transmission through an existing gear group transmission structure. The specific gear group transmission structure may include a first bevel gear 46 fixed to the output shaft of the second driving source 44, a second bevel gear 47 meshing with the first bevel gear 46, a planetary gear 48 coaxially connected with the second bevel gear 47, and an inner gear ring 49 meshing with the planetary gear 48. The inner gear ring 49 is coaxially arranged on the small turntable 43, thereby driving the small turntable 43 to rotate. The gear group transmission structure can also adopt other existing structures, which will not be described in detail.

[0055] As a preferred embodiment of the present invention, Figures 1 to 8As shown, the clamping mechanism 2 includes a support base 21, a chuck 22, and a pull rod 232 assembly 23. The support base 21 includes a supporting surface 211 for supporting the main body portion 110 and a reduced-diameter hole 212 penetrating the supporting surface 211. The chuck 22 is movably arranged in the reduced-diameter hole 212 and is provided with a clamping hole for the insertion of the convex column portion 120. The chuck 22 can reciprocate axially along the reduced-diameter hole 212 between a clamping position and a release position. The clamping hole can be reduced in diameter and deformed at the clamping position to clamp the convex column portion 120 and expanded in diameter and deformed at the release position to release the convex column portion 120. The pull rod 232 assembly 23 is connected to the chuck 22 and is used to elastically pull the chuck 22 back to the clamping position by means of elasticity; the polishing mechanism 3 is arranged on the base 1.

[0056] Reference Figures 1-8 , for the structure of the workpiece 100 of the knob type, the embodiment of the present application creatively designs a new clamping mechanism 2. The clamping mechanism 2 is arranged on the base 1 of the polishing machine. The clamping mechanism 2 includes a support base 21, a chuck 22, and a pull rod 232 assembly 23. The support base 21 includes a supporting surface 211 for supporting the main body portion 110 and a reduced-diameter hole 212 penetrating the supporting surface 211. The chuck 22 is movably arranged in the reduced-diameter hole 212 and is provided with a clamping hole for the insertion of the convex column portion 120. The chuck 22 can reciprocate axially along the reduced-diameter hole 212 between a clamping position and a release position. The clamping hole can be reduced in diameter and deformed at the clamping position to clamp the convex column portion 120 and expanded in diameter and deformed at the release position to release the convex column portion 120. The pull rod 232 assembly 23 is connected to the chuck 22 and is used to elastically pull the chuck 22 back to the clamping position by means of elasticity, so that the flexible loading and unloading and clamping of the workpiece 100 of this type can be realized; the polishing mechanism 3 arranged on the base 1 can complete the polishing treatment of the workpiece 100 clamped by the clamping mechanism 2, realizing the flexible loading and unloading and clamping and polishing treatment of the workpiece 100 of this type.

[0057] In some embodiments, reference Figures 1-8 , the pull rod 232 assembly 23 includes an elastic reset member 231 and a pull rod 232; the pull rod 232 is connected to the chuck 22, and the elastic reset member 231 is connected to the pull rod 232 and is used to pull the pull rod 232 by means of elastic potential energy to drive the chuck 22 back to the clamping position. Specifically, in some embodiments, the elastic reset member 231 is an elastic compression spring, the elastic compression spring is sleeved on the pull rod 232, and the pull rod 232 penetrates through one end of the support base 21 facing away from the supporting surface 211; wherein, a limit nut 233 is sleeved on the pull rod 232, one end of the elastic compression spring abuts against one end of the support base 21 facing away from the supporting surface 211, and the other end abuts against the limit nut 233. Or in some embodiments, one end of the elastic compression spring abuts against one end of the support base 21 facing away from the supporting surface 211, and the other end is connected to the pull rod 232. When the elastic compression spring is compressed, the elastic force makes the chuck 22 stop at the clamping position. The structure is simple and the cost is low.

[0058] In some embodiments, the material of the chuck 22 is elastic rubber, elastic silica gel, elastic composite material or elastic metal material. When the chuck 22 moves towards the clamping position, the chuck 22 is in extrusion fit with the reduced-diameter hole 212, so that the clamping hole is reduced in diameter and deformed to clamp and fix the workpiece 100.

[0059] Preferably, there are multiple polishing mechanisms 3, and the multiple polishing mechanisms 3 are respectively arranged on the base 1 and are respectively located on one side of each polishing station one by one; and / or,

[0060] The multi-channel automatic polishing machine turntable mechanism further includes multiple rotation cycle detection parts 45, and each of the small turntables 43 is provided with the rotation cycle detection part 45 for detecting the rotation cycle of the corresponding small turntable 43 one by one; the rotation cycle detection part 45 can be an existing cycle counting sensor, which can realize the statistics of the rotation cycle of the small turntable 43 to conveniently and flexibly monitor the rotation cycle and improve the polishing efficiency. And / or,

[0061] The multi-channel automatic polishing machine turntable mechanism further includes an outer box body 6 and a wire duct 7 fixedly connected to the inner top of the outer box body 6. The base 1, the clamping mechanism 2, the polishing mechanism 3, and the rotating disk mechanism 4 are all located inside the outer box body 6. The wire duct 7 is coaxially suspended above the large turntable 41. The large turntable 41 is provided with a wire passing hole facing the wire duct 7. The wire duct 7 is used to guide the wire to pass through the wire passing hole from top to bottom. The wire duct 7 can fix the wire path and reduce the interference effect between the wire and other structures.

[0062] In some embodiments, referring to Figures 1-8 , the multi-channel automatic polishing machine further includes a pressing mechanism 5. The pressing mechanism 5 is arranged on the base 1 and is arranged at intervals below the loading and unloading station. The pressing mechanism 5 is used to press the pull rod 232 assembly 23 of the clamping mechanism 2 parked at the loading and unloading station, so that the corresponding pull rod 232 assembly 23 drives the corresponding chuck 22 to move to the release position. By only arranging one pressing mechanism 5, on the one hand, the equipment cost can be reduced, and on the other hand, the automatic release clamping operation of the workpiece 100 clamped by the clamping mechanism 2 parked at the loading and unloading station can be realized, which is convenient for loading and unloading the workpiece of the clamping mechanism 2 parked at the loading and unloading station.

[0063] Referring to Figures 1-8, in some embodiments, the pushing mechanism 5 includes a displacement driving source 51 and a pushing member 52. The displacement driving source 51 is fixed to the base 1; the pushing member 52 is drivingly connected to the displacement driving source 51. The displacement driving source 51 is configured to drive the pushing member 52 to reciprocate coaxially along the extending direction of the pull rod 232 between a pushing position and a separating position. The pushing member 52 pushes the pull rod 232 assembly 23 at the pushing position to drive the chuck 22 to move to the releasing position. The pushing member 52 is separated from the pull rod 232 assembly 23 at the separating position to reset the pull rod 232 assembly 23 and move the clamping mechanism 2 to the clamping position. Specifically, the displacement driving includes a linear motor, a linear cylinder or a linear oil cylinder; the pushing member 52 may be a rod structure extending along a direction coaxial with the pull rod 232 of the clamping mechanism 2 parked at the upper unloading station. This type of pushing mechanism 5 has a simple structure and low cost, can realize automatic pushing of the pull rod 232, and is separated from the pull rod 232 when not pushing the pull rod 232, and will not affect the rotation of the large turntable 41 or the rotating disc mechanism 4.

[0064] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A multi-channel automatic polishing machine turntable mechanism, characterized in that: include: abutment(1); A polishing mechanism, arranged on the base (1); A rotating disk mechanism (4) rotatably disposed on the base (1); A plurality of clamping mechanisms (2) are arranged in a circular array around the rotating axis of the rotating disk mechanism (4) and are disposed on the rotating disk mechanism (4); The rotating disk mechanism (4) is used to rotate and drive each of the clamping mechanisms (2) to pass through an upper unloading station and a plurality of polishing stations; The rotating disk mechanism (4) comprises: A large turntable (41) rotatably disposed on the base (1); A first driving source (42) is fixed to the base (1) and is drivingly connected to the large turntable (41); A plurality of small turntables (43) are arranged in a circular array around the rotation axis of the rotating disk mechanism (4) and are rotatably disposed on the large turntable (41), and each of the small turntables (43) is respectively provided with one of the clamping mechanisms (2); A plurality of second driving sources (44) are fixed to the large turntable (41), and each of the second driving sources (44) is respectively connected to each of the small turntables (43) in a one-to-one driving manner, so as to respectively drive each of the small turntables (43) to rotate around its own rotation axis.

2. A multi-channel automatic polishing machine turntable mechanism according to claim 1, characterized in that: The clamping mechanism (2) comprises a support seat (21), a chuck (22) and a pull rod (232) assembly (23); the support seat (21) comprises a supporting surface (211) for supporting a main body of a workpiece and a reduced diameter hole (212) penetrating the supporting surface (211); the chuck (22) is movably arranged in the reduced diameter hole (212) and is provided with a clamping hole for inserting a boss portion of the workpiece; the chuck (22) can reciprocate along the axial direction of the reduced diameter hole (212) between a clamping position and a loosening position; the clamping hole can shrink and deform in the clamping position to clamp the boss portion of the workpiece and expand and deform in the loosening position to loosen the boss portion of the workpiece; the pull rod (232) assembly (23) is connected to the chuck (22) and is used to elastically pull the chuck (22) to return to the clamping position.

3. A multi-channel automatic polishing machine turntable mechanism according to claim 2, characterized in that: The pull rod (232) assembly (23) comprises: Elastic reset member (231); The pull rod (232) is connected to the clamp (22), and the elastic reset member (231) is connected to the pull rod (232) and is used to use elastic potential energy to pull the pull rod (232) to drive the clamp (22) to reset to the clamping position.

4. A multi-channel automatic polishing machine turntable mechanism according to claim 3, characterized in that: The elastic return member (231) is an elastic compression spring, and the elastic compression spring is sleeved on the pull rod (232). The pull rod (232) passes through the end of the support seat (21) facing away from the supporting surface (211); One end of the elastic compression spring abuts against one end of the support seat (21) facing away from the supporting surface (211), and the other end is connected to the pull rod (232); or, the pull rod (232) is provided with a limiting nut (233), one end of the elastic compression spring abuts against one end of the support seat (21) facing away from the supporting surface (211), and the other end abuts against the limiting nut (233).

5. The multi-channel automatic polishing machine turntable mechanism according to claim 4, characterized in that: There are a plurality of polishing mechanisms, each of which is disposed on the base (1) and is located one-to-one on one side of each polishing station; and / or, The multi-channel automatic polishing machine turntable mechanism further comprises a plurality of rotation number detection members (45), each of the small turntables (43) being provided with a one-to-one rotation number detection member (45) for detecting the rotation number of the corresponding small turntable (43); and / or, The multi-channel automatic polishing machine turntable mechanism also includes an outer box body (6) and a wiring tube (7) fixedly connected to the inner top of the outer box body (6); the base (1), the clamping mechanism (2), the polishing mechanism, and the rotating disk mechanism (4) are all located in the outer box body (6); the wiring tube (7) is coaxially suspended above the large turntable (41); the large turntable (41) is provided with a wiring hole facing the wiring tube (7); the wiring tube (7) is used to guide the line to pass through the wiring hole from top to bottom.

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