Oil injection device

Abstract

The utility model provides an oil injection device relates to electric motor car manufacturing technical field, through the height position of adjusting clamping rotating mechanism of elevating system, be convenient for user to take the oil injection piece, and the user puts the oil injection piece into clamping rotating mechanism after, adjusts the angle of oil injector, and clamping rotating mechanism drives the oil injection piece to do the rotary motion, and the oil injector is injected to the oil injection piece simultaneously, can realize the automatic oil injection of oil injection piece, and because the oil injector can rotate, adjusts the angle between oil injector and the oil injection piece of being clamped, makes the oil injection device can be applicable to different specifications and models of oil injection piece, and the applicability is stronger, and the quality hidden danger of existing art in the manual oil injection piece oiling exists, and the existing automatic oil injection equipment cannot be applicable to a variety of product model technical problem.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle manufacturing technology, and in particular to an oil injection device. Background Technology

[0002] As an important means of green transportation, the optimization of the manufacturing process of electric two-wheelers has always been a focus of the industry. The front fork assembly, as a key component connecting the frame and wheels, directly affects the handling performance and lifespan of the entire vehicle due to the quality of its bearing lubrication. Currently, the traditional lubrication method commonly used in the industry involves workers manually applying grease with a hand brush during the front fork bearing assembly process. While this method is simple to operate and has low equipment investment costs, it presents significant challenges in quality control.

[0003] During the actual implementation process, operators need to apply lithium-based or calcium-based grease to the raceway surface of the fork cup and the ball or roller contact surfaces of the bearings. Due to the uncontrollable nature of manual operation, the following process defects often occur: uneven grease coverage in the raceway of the cup, with some areas missed; inconsistent grease filling between the bearing balls, resulting in insufficient lubrication on some ball contact surfaces; and excessive grease application in certain areas leading to grease overflow contamination during subsequent assembly. These problems directly cause quality issues such as abnormal noise and increased rotational resistance in the fork assembly during subsequent use.

[0004] While existing first-generation automatic oiling equipment attempts to address the drawbacks of manual oiling, the variety of specifications among fork products, including different diameter cup sizes, different bearing types, and structural differences in fork assemblies across different brands and models, means that current equipment can only be adapted to a limited range of product models. For fork assemblies with special structures, manual oiling is still required, making it impossible to standardize the production process. Utility Model Content

[0005] The purpose of this utility model is to provide an oiling device to alleviate the quality risks of manual oiling of front forks in the prior art, and the technical problem that existing automatic oiling equipment cannot be applied to various product models.

[0006] The oil injection device provided by this utility model includes: a main frame, a lifting mechanism, a clamping and rotating mechanism, and an oil injection mechanism; The lifting mechanism is mounted on the main frame and is connected to the clamping and rotating mechanism. The lifting mechanism is used to drive the clamping and rotating mechanism to move up and down. The clamping and rotating mechanism is used to clamp the oiled part and can drive the oiled part to rotate. The oiling mechanism is mounted on the main frame. The oiling mechanism has an oiler for injecting oil into the oiled part held by the clamping and rotating mechanism. The oiler is configured to rotate to adjust the angle between the oiler and the oiled part held by the clamping and rotating mechanism.

[0007] In an optional implementation, The lifting mechanism includes a lifting drive component, a lifting transmission component, and a lifting support; The lifting drive component is fixed to the top crossbeam of the main frame; The lifting transmission component is fixed to the lifting bracket, and the lifting drive component is connected to the lifting transmission component. The lifting drive component is configured to transmit the lifting drive force to the lifting bracket through the lifting transmission component, so as to make the lifting bracket move up and down. The lifting bracket is connected to the clamping and rotating mechanism.

[0008] In an optional implementation, The lifting transmission component includes a gear section and a rack section; The gear is fixedly mounted on the drive end of the lifting drive component, and the rack is fixedly mounted vertically on the lifting bracket. The gear and the rack are meshed together so that the driving force generated by the lifting drive component can drive the lifting bracket to move up and down.

[0009] In an optional implementation, The lifting mechanism further includes a sliding bracket, a sliding component, and a sliding fixing component; The sliding bracket is connected to the top crossbeam of the main frame; The sliding components are provided on both opposite sides of the lifting bracket; The sliding bracket is provided with a sliding fixing member at the position corresponding to the sliding member, and the sliding fixing member is slidably connected to the sliding member.

[0010] In an optional implementation, The lifting mechanism also includes a protective cover; The protective cover is connected to the sliding bracket, and the protective cover is used to cover the sliding fixing component.

[0011] In an optional implementation, The clamping and rotating mechanism includes a connecting housing, a rotating drive component, a rotating transmission component, and a clamping assembly; The connecting housing is connected to the lifting bracket. The rotary drive component is disposed on the connecting housing, and the rotary transmission component is disposed inside the connecting housing. The rotary drive component is connected to the rotary transmission component in a transmission manner. The rotary drive component is configured to drive the rotary transmission component to perform a rotary motion. The gripper assembly is connected to the rotary transmission member, and the gripper assembly is used to grip the oil-injected part.

[0012] In an optional implementation, The gripper assembly includes a gripping bracket, a gripping drive mounting bracket, a gripping drive component, and a gripping fixture; One end of the clamping bracket is connected to the rotary transmission component, and the other end of the clamping bracket is connected to two oppositely arranged clamping drive mounting brackets. The clamping drive mounting bracket is provided with the clamping drive component, and the clamping tool is provided at the end of the clamping drive component near the other clamping drive component. The clamping drive component is configured to drive the clamping tool to move so as to clamp the oiled part between the two clamping tools.

[0013] In an optional implementation, The oil injection mechanism includes an oil injection drive component and an oil injection bracket; The oil injection drive component is connected to the oil injection bracket, the oil injection bracket is used to install the oil injector, and the oil injection drive component is configured to drive the oil injection bracket and the oil injector to move.

[0014] In an optional implementation, The oil injection mechanism further includes a first rotating shaft, a second rotating shaft, a third rotating shaft, a first connecting seat, and a second connecting seat; The axis of the first rotating shaft is arranged along a first direction, and the first rotating shaft is rotatably connected to the main frame. The first rotating shaft is configured to rotate around the first direction, and the first connecting seat is fixedly provided on the first rotating shaft. The axis of the second rotating shaft is arranged along the second direction, and one end of the second rotating shaft is rotatably connected to the first connecting seat, and the other end of the second rotating shaft is fixedly connected to the second connecting seat. The second rotating shaft is configured to be able to rotate around the second direction. The axis of the third rotating shaft is arranged along a third direction, and one end of the third rotating shaft is rotatably connected to the second connecting seat, and the other end of the third rotating shaft is connected to the oil injection bracket. The third rotating shaft is configured to be able to rotate around the third direction. The first direction, the second direction, and the third direction are set perpendicular to each other.

[0015] In an optional implementation, The oil injection mechanism also includes a rotating fixed seat; The rotating fixed seat is connected to the column of the main frame, and the rotating fixed seat is rotatably connected to the first rotating shaft.

[0016] The oiling device provided by this utility model adjusts the height of the clamping and rotating mechanism through a lifting mechanism, making it easier for the user to pick up the part to be oiled. After the user places the part to be oiled into the clamping and rotating mechanism, they adjust the angle of the oiler. The clamping and rotating mechanism drives the part to be oiled to rotate, and at the same time, the oiler injects oil into the part, thus realizing automatic oiling of the part. Furthermore, because the oiler can rotate, the angle between the oiler and the clamped part can be adjusted, making the oiling device applicable to parts of different specifications and models. This enhances its applicability and alleviates the quality risks associated with manual oiling of parts in the prior art, as well as the technical problem that existing automatic oiling equipment cannot be applied to multiple product models. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the oil injection device provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the lifting mechanism in the oil injection device provided in an embodiment of the present utility model; Figure 3 A structural schematic diagram of the lifting mechanism in the oil injection device provided in this embodiment of the utility model from another perspective; Figure 4 This is a schematic diagram of the clamping and rotating mechanism in the oil injection device provided in this embodiment of the utility model; Figure 5 This is a schematic diagram of the oil injection mechanism in the oil injection device provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of the oil injection mechanism in the oil injection device provided in an embodiment of the present utility model from another perspective.

[0019] Icons: 100 - Main frame; 200 - Lifting mechanism; 210 - Lifting drive component; 220 - Lifting transmission component; 221 - Gear section; 222 - Rack section; 230 - Lifting bracket; 240 - Sliding bracket; 250 - Sliding component; 260 - Sliding fixing component; 270 - Protective cover; 280 - Anti-fall pad; 300 - Clamping and rotating mechanism; 310 - Connecting housing; 320 - Rotation drive component; 330 - Rotation transmission component; 340-Grip assembly; 341-Grip bracket; 342-Grip drive mounting bracket; 343-Grip drive component; 344-Grip fixture; 400-Oil injection mechanism; 410-Oil injection drive component; 420-Oil injection bracket; 430-First rotating shaft; 440-Second rotating shaft; 450-Third rotating shaft; 460-First connecting seat; 470-Second connecting seat; 480-Rotating fixed seat; 490-Oil injector; 500-Control mechanism; Detailed Implementation The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0023] like Figures 1-6 As shown, the oil injection device provided in this embodiment includes a main frame 100, a lifting mechanism 200, a clamping and rotating mechanism 300, and an oil injection mechanism 400. The main frame 100 serves as the supporting foundation for the entire device, bearing and connecting all functional components to ensure overall structural stability and reliability. The lifting mechanism 200 is mounted on the main frame 100 and connected to the clamping and rotating mechanism 300, used to drive the clamping and rotating mechanism 300 to move vertically up and down. This lifting action allows adjustment of the height of the clamping and rotating mechanism 300, facilitating the placement or removal of the part to be oiled by the operator, improving the convenience and safety of human-machine collaboration.

[0024] The clamping and rotating mechanism 300 is located below the lifting mechanism 200 and rises and falls synchronously with it. The clamping and rotating mechanism 300 securely clamps the part to be oiled and can drive it to rotate in the horizontal plane. After clamping the part, the clamping and rotating mechanism 300 drives the part to rotate, thus completing the uniform oiling. The oiling mechanism 400 is fixed to one side column of the main frame 100. The oiling mechanism 400 has an oil injector 490, which is configured to flexibly adjust its spatial orientation, thereby adjusting the position and angle of the oil injection port to adapt to the oiling needs of different models of parts, significantly enhancing the equipment's compatibility with various product specifications.

[0025] Furthermore, the lubricator 490 achieves omnidirectional angle adjustment through a multi-degree-of-freedom rotation structure. Specifically, the lubrication mechanism 400 includes a first rotating shaft 430, a second rotating shaft 440, and a third rotating shaft 450, with their respective axes arranged in three mutually perpendicular directions. The first rotating shaft 430 is arranged vertically, and its two ends are rotatably connected to a rotating fixed seat 480 on the main frame 100. A first connecting seat 460 is fixed on the first rotating shaft 430. One end of the second rotating shaft 440 is rotatably connected to the first connecting seat 460 and is arranged horizontally. The other end of the second rotating shaft 440 is connected to a second connecting seat 470. One end of the third rotating shaft 450 is rotatably connected to the second connecting seat 470, and the other end is connected to the lubrication bracket 420 and is arranged longitudinally. The free directional adjustment of the lubricator 490 is achieved through the first rotating shaft 430, the second rotating shaft 440, and the third rotating shaft 450.

[0026] In addition, the first connecting seat 460 and the second connecting seat 470 have the same structure. The first connecting seat 460 has two through holes. One through hole is used for the first rotating shaft 430 to pass through, and the first rotating shaft 430 is fixed to the connecting seat by the clamping force of the screw. The other through hole is used for the second rotating shaft 440 to pass through, and the second rotating shaft 440 can rotate freely inside it. Similarly, the second connecting seat 470 is fixed to the second rotating shaft 440 and rotatably connected to the third rotating shaft 450.

[0027] The oil injection mechanism 400 also includes an oil injection drive component 410 and an oil injection bracket 420. The oil injection drive component 410 is specifically configured as a linear electric cylinder or a lead screw module, etc. The oil injection drive component 410 is fixed at an appropriate position on the main frame 100. The output end of the oil injection drive component 410 is connected to the oil injection bracket 420, which can drive the oil injection bracket 420 together with the oil injector 490 to perform a feeding movement, realizing the approach or departure action during the oil injection process, and ensuring that the oil injection nozzle is accurately inserted into the oil injection port of the oiled part.

[0028] In addition, the entire oiling process is uniformly coordinated and managed by the control mechanism 500 installed on the main frame 100. The control mechanism 500 integrates a controller, operation panel and sensor module, and can program and set parameters such as lifting height, rotation speed, clamping force, oiling time and oiler 490 movement trajectory, so as to realize the switching between fully automatic or semi-automatic operation mode and improve work efficiency and consistency.

[0029] Regarding the structure of the lifting mechanism 200, specifically: The lifting mechanism 200 includes a lifting drive component 210, a lifting transmission component 220, and a lifting bracket 230. The lifting drive component 210 is mounted on the crossbeam at the top of the main frame 100 and is specifically configured as a drive motor, providing lifting driving force as a power source. The lifting transmission component 220 is mounted on the lifting bracket 230 and is connected to the output end of the lifting drive component 210, transmitting power to the lifting bracket 230, thereby driving the lifting bracket 230 to move up and down.

[0030] In a preferred embodiment, the lifting transmission component 220 adopts a gear and rack structure: the gear part 221 is fixed on the output shaft of the lifting drive component 210, and the rack part 222 is vertically fixed to the side wall of the lifting bracket 230. The two mesh with each other, so that the lifting bracket 230 can be smoothly lifted and lowered by the forward and reverse rotation of the motor.

[0031] To enhance safety, a fall arrestor block 280 is provided below the rack section 222. The fall arrestor block 280 is fixed to the lifting bracket 230. When the fastening screws connecting the rack accidentally loosen and cause the rack to slide down, the fall arrestor block 280 can support the rack in time to prevent it from falling off and causing equipment damage or safety accidents.

[0032] To improve the guiding accuracy and operational stability during the lifting process, the lifting mechanism 200 is also equipped with a sliding bracket 240, a sliding component 250, and a sliding fixing component 260. The sliding bracket 240 is fixedly connected to the top crossbeam of the main frame 100, and sliding fixing components 260 are provided on both sides. The sliding fixing components 260 are specifically sliders. Sliding components 250 are installed at corresponding positions on both sides of the lifting bracket 230. The sliding components 250 are specifically slide rails. The sliding fixing components 260 and the sliding components 250 form a sliding engagement relationship, allowing the lifting bracket 230 to move only in a straight line in the vertical direction, effectively avoiding shaking or jamming caused by uneven loading. In addition, a protective cover 270 is installed outside the sliding area. This protective cover 270 is connected to the sliding bracket 240, covering the sliding fixing components 260 and some transmission components, serving to prevent dust, foreign object intrusion, and provide safety protection.

[0033] Regarding the structure of the clamping and rotating mechanism 300, specifically: The clamping and rotating mechanism 300 mainly includes a connecting housing 310, a rotating drive component 320, a rotating transmission component 330, and a gripper assembly 340. The connecting housing 310 is fixed to the bottom of the lifting bracket 230, serving as the mounting base for the clamping and rotating mechanism 300. The rotating drive component 320 can be configured as a servo motor, mounted on the outside of the connecting housing 310. The output shaft of the rotating drive component 320 extends into the connecting housing 310 and connects to the rotating transmission component 330. The rotating transmission component 330 is configured as a rotating flange. The rotating drive component 320 can achieve transmission through gear meshing, transmitting power to the gripper assembly 340.

[0034] The gripper assembly 340 includes a gripping bracket 341, two gripping drive mounting brackets 342, a gripping drive component 343, and a gripping fixture 344. One end of the gripping bracket 341 is connected to the rotary transmission component 330 for follow-up rotation, and the other end is connected to the two opposing gripping drive mounting brackets 342. Each mounting bracket is equipped with a gripping drive component 343, which can be configured as a cylinder or an electric push rod. The front end of the drive rod of the gripping drive component 343 is equipped with a gripping fixture 344, which is a chuck for contacting the outer wall of the part to be oiled. The two gripping fixtures 344 move towards or away from each other under the push of the gripping drive component 343, thereby clamping and releasing the part to be oiled. After clamping, the rotary drive component 320 is activated, causing the part to be oiled to rotate slowly, so that the oiler 490 can complete circumferential uniform oil injection while it is rotating.

[0035] In summary, the oiling device achieves height adjustment through the lifting mechanism 200, facilitating loading and unloading; the clamping and rotating mechanism 300 clamps and rotates the oiled parts at a uniform speed; and the oiling mechanism 400 flexibly adjusts the angle of the oiler 490° using a multi-axis rotating structure, combined with linear drive to complete the oiling action. The entire system boasts a high degree of automation and strong adaptability, effectively solving problems such as uneven oiling, oil leakage, and contamination from manual application, as well as the poor versatility of traditional automatic equipment. It is widely applicable to the lubrication process of oiled parts production lines in industries such as motorcycles, electric vehicles, and bicycles.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An oil injection device, characterized in that, include: The main frame (100), lifting mechanism (200), clamping and rotating mechanism (300) and oil injection mechanism (400); The lifting mechanism (200) is mounted on the main frame (100). The lifting mechanism (200) is connected to the clamping and rotating mechanism (300) in a transmission manner. The lifting mechanism (200) is used to drive the clamping and rotating mechanism (300) to move up and down. The clamping and rotating mechanism (300) is used to clamp the oiled part and can drive the oiled part to rotate. The oiling mechanism (400) is disposed on the main frame (100). The oiling mechanism (400) has an oiler (490) for injecting oil into the oiled part held by the clamping and rotating mechanism (300). The oiler (490) is configured to rotate to adjust the angle between the oiler (490) and the oiled part held by the clamping and rotating mechanism (300).

2. The oil injection device according to claim 1, characterized in that, The lifting mechanism (200) includes a lifting drive component (210), a lifting transmission component (220), and a lifting bracket (230). The lifting drive component (210) is fixed to the top crossbeam of the main frame (100); The lifting transmission component (220) is fixed on the lifting bracket (230), and the lifting drive component (210) is connected to the lifting transmission component (220). The lifting drive component (210) is configured to transmit the lifting drive force to the lifting bracket (230) through the lifting transmission component (220) so that the lifting bracket (230) can move up and down. The lifting bracket (230) is connected to the clamping and rotating mechanism (300).

3. The oil injection device according to claim 2, characterized in that, The lifting transmission component (220) includes a gear part (221) and a rack part (222). The gear (221) is fixedly mounted on the drive end of the lifting drive member (210), and the rack (222) is fixedly mounted vertically on the lifting bracket (230). The gear (221) and the rack (222) mesh with each other so that the driving force generated by the lifting drive member (210) can drive the lifting bracket (230) to move up and down.

4. The oil injection device according to claim 2, characterized in that, The lifting mechanism (200) further includes a sliding bracket (240), a sliding component (250), and a sliding fixing component (260). The sliding bracket (240) is connected to the top crossbeam of the main frame (100); The sliding components (250) are provided on both opposite sides of the lifting bracket (230). The sliding bracket (240) is provided with a sliding fixing member (260) at the position corresponding to the sliding member (250), and the sliding fixing member (260) is slidably connected to the sliding member (250).

5. The oil injection device according to claim 4, characterized in that, The lifting mechanism (200) also includes a protective cover (270); The protective cover (270) is connected to the sliding bracket (240), and the protective cover (270) is used to cover the sliding fixing member (260).

6. The oil injection device according to claim 2, characterized in that, The clamping and rotating mechanism (300) includes a connecting housing (310), a rotating drive component (320), a rotating transmission component (330), and a clamping assembly (340). The connecting housing (310) is connected to the lifting bracket (230), the rotary drive component (320) is disposed on the connecting housing (310), the rotary transmission component (330) is disposed inside the connecting housing (310), the rotary drive component (320) is connected to the rotary transmission component (330) in a transmission connection, and the rotary drive component (320) is configured to drive the rotary transmission component (330) to perform a rotational motion; The gripper assembly (340) is connected to the rotary transmission member (330), and the gripper assembly (340) is used to grip the oiled part.

7. The oil injection device according to claim 6, characterized in that, The gripper assembly (340) includes a gripping bracket (341), a gripping drive mounting bracket (342), a gripping drive component (343), and a gripping fixture (344). One end of the clamping bracket (341) is connected to the rotary transmission member (330), and the other end of the clamping bracket (341) is connected to two oppositely arranged clamping drive mounting brackets (342). The clamping drive mounting bracket (342) is provided with the clamping drive member (343). The clamping drive member (343) is provided with the clamping fixture (344) at the end near the other clamping drive member (343). The clamping drive member (343) is configured to drive the clamping fixture (344) to move so as to clamp the oiled part between the two clamping fixtures (344).

8. The oil injection device according to claim 1, characterized in that, The oil injection mechanism (400) includes an oil injection drive component (410) and an oil injection bracket (420). The oil injection drive component (410) is connected to the oil injection bracket (420) for transmission. The oil injection bracket (420) is used to install the oil injector (490). The oil injection drive component (410) is configured to drive the oil injection bracket (420) and the oil injector (490) to move.

9. The oil injection device according to claim 8, characterized in that, The oil injection mechanism (400) further includes a first rotating shaft (430), a second rotating shaft (440), a third rotating shaft (450), a first connecting seat (460), and a second connecting seat (470); The axis of the first rotating shaft (430) is arranged along the first direction, and the first rotating shaft (430) is rotatably connected to the main frame (100). The first rotating shaft (430) is configured to rotate around the first direction, and the first connecting seat (460) is fixedly provided on the first rotating shaft (430). The axis of the second rotating shaft (440) is arranged along the second direction, and one end of the second rotating shaft (440) is rotatably connected to the first connecting seat (460), and the other end of the second rotating shaft (440) is fixedly connected to the second connecting seat (470). The second rotating shaft (440) is configured to be able to rotate about the second direction. The axis of the third rotating shaft (450) is arranged along a third direction, and one end of the third rotating shaft (450) is rotatably connected to the second connecting seat (470), and the other end of the third rotating shaft (450) is connected to the oil injection bracket (420). The third rotating shaft (450) is configured to be able to rotate about the third direction. The first direction, the second direction, and the third direction are set perpendicular to each other.

10. The oil injection device according to claim 9, characterized in that, The oil injection mechanism (400) also includes a rotating fixed seat (480); The rotating fixed seat (480) is connected to the column of the main frame (100), and the rotating fixed seat (480) is rotatably connected to the first rotating shaft (430).

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