conveying line

Abstract

The application discloses a conveying line, which comprises a transmission assembly, a rotating work assembly and a jacking device; the rotating work assembly comprises a base, a rotating assembly and a locking assembly; the base is arranged on the transmission assembly; the rotating assembly comprises a first rotating shaft, the first rotating shaft is rotatably arranged in the base and protrudes from the base at both ends; the locking assembly is arranged on the base and is used for locking the rotating assembly on the base; the jacking device comprises a rotating driving assembly, an unlocking assembly and a jacking driving assembly; the rotating driving assembly and the unlocking assembly are both arranged on the jacking driving assembly; the rotating driving assembly can be driven by the jacking driving assembly to move upwards to clamp the first rotating shaft; the rotating driving assembly is used for driving the first rotating shaft to rotate; and the unlocking assembly can be driven by the jacking driving assembly to move upwards to drive the locking assembly to release the locking of the rotating assembly. The conveying line can lock workpieces during transmission and drive the workpieces to rotate when the workpieces need to be sprayed.

Description

Technical Field

[0001] This invention relates to a conveyor line, and more particularly to a conveyor line for use in the field of spray coating technology. Background Technology

[0002] Spray coating is a commonly used process in industrial production. First, the surface of the workpiece is cleaned. Then, paint is sprayed onto the workpiece surface, followed by leveling and curing steps, ultimately creating a coating layer that meets the workpiece's surface requirements for wear resistance, gloss, etc. In traditional spray coating processes, to ensure all-around paint application, the workpiece is often mounted on a rotating component. The component rotates during paint application to ensure even coating. Typically, a transfer assembly moves the rotating component carrying the workpiece between different stations for automated workpiece transport. For example, the transfer assembly moves the rotating component and workpiece sequentially through cleaning, spraying, leveling, and curing stations. However, because the rotating component is rotatable, it often cannot stably hold the workpiece during transport, causing it to wobble. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention proposes a conveyor line that can lock the workpiece during transport and drive the workpiece to rotate when a spraying operation is required.

[0004] According to an embodiment of the present invention, a conveyor line includes a transmission component, a rotating working component, and a lifting device. The rotating working component includes a base, a rotating component, and a locking component. The base is disposed on the transmission component. The rotating component includes a first rotating shaft, which is rotatably inserted through the base, with both ends of the first rotating shaft protruding from the base. The upper end of the first rotating shaft is used to fix a workpiece or workpiece carrier. The locking component is disposed on the base and is used to lock the rotating component on the base. The lifting device includes a rotation drive component, an unlocking component, and a lifting drive component. The rotation drive component and the unlocking component are both located below the transmission component and disposed on the lifting drive component. The rotation drive component can move upward under the drive of the lifting drive component to engage the first rotating shaft. The rotation drive component is used to drive the first rotating shaft to rotate. The unlocking component can move upward under the drive of the lifting drive component to drive the locking component to release the lock on the rotating component.

[0005] The conveyor line according to embodiments of the present invention has at least the following beneficial effects:

[0006] Because the rotating working component is mounted on the transmission component, the transmission component can move the rotating working component between different workstations, allowing the workpiece positioned on the rotating working component to complete surface cleaning, spraying, leveling, and curing at different workstations. The locking component prevents the rotating component from rotating, locking it during transmission and locking the workpiece fixed to it, thus preventing the workpiece positioned on the first rotating shaft from swinging and avoiding displacement or detachment during transport. Furthermore, a lifting device located below the transmission component allows the rotating working component to move the workpiece to the spraying station. The lifting drive component drives the rotating drive component and the unlocking component upwards, releasing the lock on the rotating component and causing the rotating drive component to rotate the first rotating shaft, thus automatically rotating the workpiece to improve the uniformity of the spraying process.

[0007] According to some embodiments of the present invention, the transmission assembly includes two parallel and spaced transmission lines and a plurality of support frames transversely disposed between the two transmission lines. The two ends of the support frames in the width direction are respectively disposed on the two transmission lines, and the support frames are movable under the drive of the transmission lines. The base is connected to the support frame, and the lower end of the first rotating shaft is rotatably disposed through the support frame.

[0008] According to some embodiments of the present invention, the locking assembly includes a rotating member, an abutting member, and a counterweight. The rotating assembly has a locking surface on its side. The rotating member is rotatably mounted on a base via a second rotating shaft. The abutting member and the counterweight are mounted on the rotating member and located on both sides of the base. When the rotating assembly is in a locked state, the abutting member abuts against the locking surface, and the torque of the counterweight's gravity on the second rotating shaft is greater than the torque of the abutting member's gravity on the second rotating shaft, so that the abutting member can maintain contact with the locking surface.

[0009] According to some embodiments of the present invention, in the conveyor line, the horizontal distance from the center of gravity of the counterweight to the second rotating shaft is greater than the horizontal distance from the center of gravity of the abutment to the second rotating shaft.

[0010] According to some embodiments of the present invention, in the conveyor line, the weight of the counterweight is greater than the weight of the abutment.

[0011] According to some embodiments of the present invention, the unlocking assembly includes a push rod located below the counterweight, which can be moved upward under the drive of the lifting drive assembly and push the counterweight to rotate upward so as to separate the abutment from the locking surface.

[0012] According to some embodiments of the present invention, the lifting drive assembly includes a lifting plate and a lifting driver, the lifting plate is disposed on the drive end of the lifting driver, and the rotation drive assembly and the unlocking assembly are disposed on the lifting plate.

[0013] According to some embodiments of the present invention, in the conveyor line, the distance between the upper end of the drive end of the rotary drive assembly and the first rotating shaft is greater than the distance between the upper end of the unlocking assembly and the counterweight.

[0014] According to some embodiments of the present invention, the rotating assembly further includes a locking sleeve, which is located above the base and sleeved on the first rotating shaft and can rotate with the first rotating shaft, with a locking surface disposed on the locking sleeve.

[0015] According to some embodiments of the present invention, the base of the conveyor line includes a main body and a connecting part, the central axes of the main body and the connecting part intersect and are perpendicular to each other, the main body is sleeved on a first rotating shaft, the connecting part protrudes from the side wall of the main body, and a rotating member is rotatably connected to the connecting part.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a top view of the conveyor line according to an embodiment of the present invention;

[0019] Figure 2 for Figure 1 Side view of the connection structure between the transmission component and the rotating working component;

[0020] Figure 3 This is a schematic diagram of the rotating working component and lifting device in the conveyor line according to an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Schematic diagram of the rotating working assembly;

[0022] Figure 5 for Figure 4 Top view of the rotating working component;

[0023] Figure 6 for Figure 5 A cross-sectional view of section line AA in the middle.

[0024] Figure label:

[0025] Transmission line 1100; support frame 1200; rotating working assembly 2000; base 2100; main body 2110; adapter 2120; fixing part 2130; rotating assembly 2200; first rotating shaft 2210; protrusion 2211; locking sleeve 2220; bearing 2230; locking assembly 2300; rotating part 2310; rotating plate 2311; bolt 2312; abutment part 2320; counterweight 2330; counterweight block 2331; fixed shaft 2332; lifting device 3000; rotating drive assembly 3100; slot 3110; opening 3120; unlocking assembly 3200; lifting plate 3300; lifting driver 3400. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, left, right, front, back, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0029] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0030] The following is for reference only. Figure 1 To be continued Figure 6 This describes the conveyor line according to an embodiment of the present invention.

[0031] Reference Figures 1 to 3The conveyor line of this embodiment includes a transmission assembly, a rotating working assembly 2000, and a lifting device 3000. The rotating working assembly includes a base 2100, a rotating assembly 2200, and a locking assembly 2300. The base 2100 is disposed on the transmission assembly. The rotating assembly 2200 includes a first rotating shaft 2210, which is rotatably disposed on the base 2100, with both ends of the first rotating shaft 2210 protruding from the base 2100. The upper end of the first rotating shaft 2210 is used to fix a workpiece or workpiece carrier. The locking assembly 2300 is disposed on the base 2100 and is used to lock the rotating assembly 2200. Locked on the base 2100; the lifting device 3000 includes a rotary drive assembly 3100, an unlocking assembly 3200 and a lifting drive assembly. The rotary drive assembly 3100 and the unlocking assembly 3200 are both located below the transmission assembly and are mounted on the lifting drive assembly. The rotary drive assembly 3100 can move upward under the drive of the lifting drive assembly to engage the first rotating shaft 2210. The rotary drive assembly 3100 is used to drive the first rotating shaft 2210 to rotate. The unlocking assembly 3200 can move upward under the drive of the lifting drive assembly to drive the locking assembly 2300 to release the lock on the rotary assembly 2200.

[0032] Combination Figure 1 , Figure 2 and Figure 6 Specifically, the transmission assembly includes two parallel and spaced-apart transmission lines 1100 and several support frames 1200 transversely arranged between the two transmission lines 1100. The two ends of the support frames 1200 in the width direction are respectively disposed on the two transmission lines 1100. The support frames 1200 move under the drive of the transmission lines 1100. The rotating working assembly 2000 is fixed to the support frames 1200. Specifically, screws pass through the fixing part 2130 on the base 2100 and are threaded onto the support frames 1200. It can be understood that the lower end of the first rotating shaft 2210 rotatably passes through the support frames 1200. Specifically, the transmission lines 1100 can be selected as either a base chain conveyor or a double-speed chain conveyor.

[0033] It should be understood that the transmission line 1100 passes through multiple different stations, such as a cleaning station for cleaning the workpiece, a spraying station for spraying the workpiece, a leveling station for leveling the paint on the workpiece, a curing station for curing the paint on the workpiece, etc., and the lifting device 3000 can be optionally installed at the spraying station.

[0034] It should be understood that, since the rotary working component 2000 is mounted on the transmission component, the transmission component can drive the rotary working component 2000 to move between different workstations, so that the workpiece positioned on the rotary working component 2000 can complete surface cleaning, spraying, leveling, curing, and other operations at different workstations. Furthermore, by setting the locking component 2300, the rotation of the rotating component 2200 can be stopped, so that during the transmission process, the rotating component 2200 can be locked by the locking component 2300, and the workpiece fixed on the rotating component 2200 can be locked along with the rotating component 2200, thereby preventing positioning issues. The workpiece swings at the upper end of the first rotating shaft 2210, thereby preventing the workpiece from shifting or detaching from the rotating working assembly 2000 during transportation. Furthermore, by means of the lifting device 3000 located below the transmission assembly, when the rotating working assembly 2000 carries the workpiece to the spraying station, the lifting drive assembly drives the rotating drive assembly 3100 and the unlocking assembly 3200 to move upward. This unlocking assembly 3200 releases the lock on the rotating assembly 2200, and the rotating drive assembly 3100 drives the first rotating shaft 2210 to rotate, so that the workpiece can rotate automatically, thereby improving the uniformity of the workpiece spraying process.

[0035] Combination Figure 3 and Figure 4 Specifically, a protrusion 2211 is provided on the lower sidewall of the first rotating shaft 2210, and a slot 3110 for accommodating the lower end of the first rotating shaft 2210 is provided on the upper part of the drive end of the rotary drive assembly 3100, and an opening 3120 for engaging the protrusion 2211 is provided on the sidewall of the slot 3110. When the rotary drive assembly 3100 moves upward, the lower end of the first rotating shaft 2210 is accommodated in the slot 3110, and the protrusion 2211 is accommodated in the opening 3120, so as to engage the first rotating shaft 2210 on the drive end of the rotary drive assembly 3100. When the rotary drive assembly 3100 rotates, the protrusion 2211 abuts against the sidewall of the opening 3120 to prevent the first rotating shaft 2210 from rotating relative to the drive end of the rotary assembly, so as to realize that the rotary drive assembly 3100 drives the first rotating shaft 2210 to rotate.

[0036] It is understandable that multiple lifting devices 3000 can be provided, and when the same number of rotating working components 2000 are provided on the support frame 1200, the lifting devices 3000 and the rotating working components 2000 correspond one-to-one, so that the workpieces on multiple rotating working components 2000 can be sprayed at the same time to improve efficiency.

[0037] It is understood that the locking assembly 2300 includes a rotating member 2310, an abutment member 2320, and a counterweight member 2330. The rotating assembly 2200 has a locking surface on its side. The rotating member 2310 is rotatably mounted on the base 2100 via a second rotating shaft. The abutment member 2320 and the counterweight member 2330 are mounted on the rotating member 2310 and located on both sides of the base 2100. When the rotating assembly 2200 is in the locked state, the abutment member 2320 abuts against the locking surface, and the torque of the weight of the counterweight member 2330 on the second rotating shaft is greater than the torque of the weight of the abutment member 2320 on the second rotating shaft, so that the abutment member 2320 can maintain contact with the locking surface. By rotating the rotating member 2310 onto the base 2100 and placing the abutment member 2320 and the counterweight member 2330 on both sides of the base 2100, the counterweight member 2330 moves downward under its own weight, causing one end of the rotating member 2310 connected to the counterweight member 2330 to rotate downward. This causes one end of the rotating member 2310 connected to the abutment member 2320 to rotate upward, thereby causing the abutment member 2320 to move upward. As a result, the side wall of the abutment member 2320 abuts against the side wall of the rotating assembly 2200. The friction between the abutment member 2320 and the rotating assembly 2200 hinders the rotation of the rotating assembly 2200, thereby locking the rotating assembly 2200.

[0038] It is understood that the rotating assembly 2200 also includes a locking sleeve 2220, which is located above the base 2100 and sleeved on the first rotating shaft 2210, and can rotate with the first rotating shaft 2210. The locking surface is provided on the locking sleeve 2220. This arrangement allows the locking sleeve 2220 to abut against the abutment 2320 in the form of a surface, making it difficult for the locking sleeve 2220 to rotate relative to the abutment 2320, thereby enhancing the locking effect of the locking structure. Furthermore, by setting the locking sleeve 2220, the distance between the rotating assembly 2200 and the abutment 2320 is shortened, making it easier for the abutment 2320 to abut against the side wall of the rotating assembly 2200. It is understood that the locking sleeve 2220 can be threadedly connected to the first rotating shaft 2210.

[0039] It is understandable that multiple locking surfaces are provided and distributed along the circumference of the locking sleeve 2220 so that the outer contour of the cross-section of the locking sleeve 2220 is a polygon.

[0040] Combination Figure 5Specifically, the rotating component 2310 includes two rotating plates 2311 and a bolt 2312. The bolt 2312 passes through the rotating plates 2311 and is threaded onto the base 2100. The smooth portion of the bolt 2312 passes through the rotating plates 2311, allowing the rotating plates 2311 to rotate relative to the bolt 2312, and consequently, the rotating plates 2311 to rotate relative to the base 2100. In this case, the bolt 2312 serves as the second pivot. It is understood that a first transition portion can also be provided on the base 2100, and a second transition portion can be provided on the rotating plates 2311. The first transition portion is rotatably fitted onto the second transition portion, in which case the second transition portion serves as the second pivot. Alternatively, the second transition portion can be rotatably fitted onto the first transition portion, in which case the first transition portion serves as the second pivot. By setting two rotating plates 2311 and placing the abutment 2320 horizontally between the two rotating plates 2311, when the rotating plate 2310 drives the abutment 2320 to rotate, the force on the abutment 2320 is more balanced, and the locking structure is more stable. Figure 5 Specifically, screws are threaded sequentially onto the rotating plate 2311 and the abutment 2320 to fix the abutment 2320 onto the rotating plate 2311. Figure 4 and Figure 6 Specifically, the rotating plate 2311 is L-shaped. When the abutment member 2320 abuts against the rotating assembly 2200, one side of the L-shaped rotating plate 2311 is perpendicular to the first rotating shaft 2210, and the other side is parallel to the first rotating shaft 2210. With this arrangement, when the abutment member 2320 is a long plate, one plane of the abutment member 2320 can fit against the side wall of the rotating assembly 2200, so that the contact area between the abutment member 2320 and the rotating assembly 2200 is larger, thereby enhancing the locking effect.

[0041] Combination Figure 4 and Figure 5 Specifically, the counterweight 2330 includes a counterweight block 2331 and a fixed shaft 2332, with the fixed shaft 2332 passing through the counterweight block 2331 and the rotating plate 2311 respectively. Specifically, the counterweight block 2331 and the fixed shaft 2332 are clearance-fitted or threadedly connected.

[0042] Combination Figure 6 Specifically, the rotating assembly 2200 also includes a bearing 2230, which is disposed between the base 2100 and the first rotating shaft 2210. By providing the bearing 2230, the first rotating shaft 2210 can rotate more stably.

[0043] It is understood that the horizontal distance from the center of gravity of the counterweight 2330 to the second rotating shaft is greater than the horizontal distance from the center of gravity of the abutment 2320 to the second rotating shaft. Based on the lever principle, it is understood that the above arrangement enables the counterweight 2330 to better drive the rotating component 2310 to rotate. Furthermore, compared to the case where the horizontal distance from the center of gravity of the counterweight 2330 to the second rotating shaft is less than or equal to the horizontal distance from the center of gravity of the abutment 2320 to the second rotating shaft, the counterweight 2330 can still achieve the effect of driving the rotating component 2310 to rotate even when its weight is less than that of the abutment 2320. This reduces the amount of raw materials used in the counterweight 2330, saves manufacturing costs, and makes the locking structure of the rotating working component 2000 of this embodiment of the invention more convenient.

[0044] Understandably, the weight of the counterweight 2330 is greater than the weight of the abutment 2320. This arrangement allows the abutment 2320 to more tightly hold the rotating assembly 2200, thereby enhancing the locking effect.

[0045] Understandably, during transport, the rotating working component 2000 is securely fixed and will not rotate freely. When it is necessary to rotate the rotating working component 2000, the lifting device 3000 moves the unlocking component 3200 upward to the lifting counterweight 2331, thereby moving the abutment part 2320 downward, thus releasing the locked state of the rotating working component 2000. This achieves the effect of locking the rotating component 2200 and the workpiece during transport without affecting the normal rotation of the rotating component 2200 and the workpiece during spraying, and is convenient to operate. Figure 1 Specifically, the unlocking component 3200 includes a push rod located below the counterweight 2330. The push rod can move upward under the drive of the lifting drive component and push the counterweight 2330 to rotate upward so that the abutment 2320 separates from the locking surface.

[0046] It is understood that the base 2100 includes a main body 2110 and a connecting part 2120. The central axes of the main body 2110 and the connecting part 2120 intersect and are perpendicular to each other. The main body 2110 is sleeved on the first rotating shaft 2210, the connecting part 2120 protrudes from the side wall of the main body 2110, and the rotating member 2310 is rotatably connected to the connecting part 2120. Figure 5 Specifically, the bolt 2312 is threaded onto the adapter 2120. This arrangement ensures that there is a certain distance between the rotating plate 2311 and the main body 2110, preventing the rotating plate 2311 from contacting the main body 2110 and affecting its rotation, thereby ensuring the flexibility of the locking assembly 2300.

[0047] Understandably, in combination Figure 3Specifically, the lifting drive assembly includes a lifting plate 3300 and a lifting driver 3400. The lifting plate 3300 is disposed at the drive end of the lifting driver 3400, and the rotation drive assembly 3100 and the unlocking assembly 3200 are disposed on the lifting plate 3300. This arrangement allows the unlocking assembly 3200 and the rotation drive assembly 3100 to move upward synchronously, enabling the unlocked state and the rotating working assembly 2000 to operate simultaneously, thereby improving efficiency. It also makes the structure of this embodiment more compact.

[0048] It is understandable that the distance between the upper end of the drive end of the rotary drive assembly 3100 and the first rotating shaft 2210 is greater than the distance between the upper end of the unlocking assembly 3200 and the counterweight 2330. Combined with... Figure 3 Specifically, when the lifting driver 3400 drives the lifting plate 3300 to move upward, the upper end of the unlocking component 3200 first contacts the counterweight 2331. As the lifting plate 3300 moves upward, the unlocking component 3200 drives the counterweight 2331 to move upward, so that the abutment 2320 moves downward, thereby releasing the locking state of the rotating working component 2000. At the same time, the driving end of the rotating drive component 3100 moves upward to engage with the first rotating shaft 2210, thereby enabling the first rotating shaft 2210 to rotate.

[0049] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A conveyor line, characterized in that, include: Transmission components; A rotating working assembly includes a base, a rotating assembly, and a locking assembly. The base is disposed on the transmission assembly. The rotating assembly includes a first rotating shaft that is rotatably disposed through the base, with both ends of the first rotating shaft protruding from the base. The upper end of the first rotating shaft is used to fix a workpiece or workpiece carrier. The locking assembly is disposed on the base and is used to lock the rotating assembly on the base. A lifting device includes a rotation drive assembly, an unlocking assembly, and a lifting drive assembly. The rotation drive assembly and the unlocking assembly are both located below the transmission assembly and are disposed on the lifting drive assembly. The rotation drive assembly can move upward under the drive of the lifting drive assembly to engage the first rotating shaft. The rotation drive assembly is used to drive the first rotating shaft to rotate. The unlocking assembly can move upward under the drive of the lifting drive assembly to drive the locking assembly to release the locking of the rotation assembly. The locking assembly includes a rotating member, an abutting member, and a counterweight. The rotating assembly has a locking surface on its side. The rotating member is rotatably mounted on the base via a second rotating shaft. The abutting member and the counterweight are mounted on the rotating member and located on both sides of the base. When the rotating assembly is in the locked state, the abutting member abuts against the locking surface, and the torque of the counterweight's weight on the second rotating shaft is greater than the torque of the abutting member's weight on the second rotating shaft, so that the abutting member can maintain contact with the locking surface. The horizontal distance from the center of gravity of the counterweight to the second rotating shaft is greater than the horizontal distance from the center of gravity of the abutment to the second rotating shaft; The unlocking component includes a push rod located below the counterweight, which can be moved upward under the drive of the lifting drive component and push the counterweight to rotate upward so as to separate the abutment from the locking surface.

2. The conveyor line according to claim 1, characterized in that, The transmission component includes two parallel and spaced transmission lines and several support frames horizontally disposed between the two transmission lines. The two ends of the support frames in the width direction are respectively disposed on the two transmission lines, and the support frames can move under the drive of the transmission lines. The base is connected to the support frames, and the lower end of the first rotating shaft is rotatably inserted through the support frames.

3. The conveyor line according to claim 1, characterized in that, The weight of the counterweight is greater than the weight of the abutment.

4. The conveyor line according to claim 1, characterized in that, The lifting drive assembly includes a lifting plate and a lifting driver. The lifting plate is disposed on the driving end of the lifting driver, and the rotation drive assembly and the unlocking assembly are disposed on the lifting plate.

5. The conveyor line according to claim 4, characterized in that, The distance between the upper end of the drive end of the rotary drive assembly and the first rotating shaft is greater than the distance between the upper end of the unlocking assembly and the counterweight.

6. The conveyor line according to claim 1, characterized in that, The rotating assembly also includes a locking sleeve, which is located above the base and sleeved on the first rotating shaft, and can rotate with the first rotating shaft. The locking surface is disposed on the locking sleeve.

7. The conveyor line according to any one of claims 1 to 6, characterized in that, The base includes a main body and a connecting part. The central axes of the main body and the connecting part intersect and are perpendicular to each other. The main body is sleeved on the first rotating shaft. The connecting part protrudes from the side wall of the main body and the rotating member is rotatably connected to the connecting part.

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