A semi-finished axle tilting and conveying device

Abstract

This invention belongs to the field of axle processing and conveying technology, specifically a semi-finished axle flipping and conveying device. It includes symmetrically arranged supports on both sides. On the side of each support closest to the other, a rotating rod is mounted via a motor. A central disc is fixedly mounted at the end of each rotating rod closest to the other. Multiple telescopic plates are circumferentially fixed along the outer edge of the central disc. A hollow frame is fixedly mounted between two symmetrical telescopic plates on the two central discs. This invention uses an electric slip ring to drive the rotating ring to adjust the height of the hollow frame, ensuring precise alignment or misalignment between the active block and the blocking block. During the flipping process, the active block contacts the blocking block, driving the rocker plate and shaft linkage to flip the right-angle frame and the axle, ensuring thorough coating of the top and bottom surfaces of the axle. The hollow frame's inner cavity has a return tube connected to an air cylinder. When the hollow frame rotates, it drives the air cylinder slider into a track groove. The track groove guides the slider to press down the piston rod, causing the gas in the air cylinder to be blown onto the axle through the air supply pipe and return tube, achieving automatic drying without additional power.

Description

Technical Field

[0001] This invention belongs to the field of axle processing and conveying technology, specifically a semi-finished axle flipping and conveying device. Background Technology

[0002] The axle (also known as the vehicle axle) is one of the core components of the automobile chassis. It is mainly used to connect the wheels to the frame or body, transmit the vehicle's traction, braking force, load-bearing capacity and steering force, support the weight of the vehicle body and ensure the smooth driving of the wheels. It is divided into drive axles, steering axles, support axles and other types. It is a key load-bearing and force transmission component for vehicle driving. The semi-finished axle needs to be transported and rotated at the same time. The core reason is to solve the problem of uneven coating. The semi-finished axle is mostly an irregular columnar structure with surfaces such as flat surfaces, inclined surfaces, arc surfaces and curved surfaces. When transported in a fixed position, only the exposed surface can be sprayed. Rotation can make all surfaces sprayed, thereby ensuring the uniformity of coating.

[0003] Traditional axle conveyor tipping devices still have some drawbacks in use: 1. Existing axle conveying devices are difficult to adapt to workpieces of various specifications, and the uniformity of coating cannot be guaranteed. In actual production, semi-finished axle products have different specifications in length and diameter. However, the clamping structure of the existing device has a fixed height and spacing, which cannot be flexibly adjusted, resulting in extremely poor adaptability. At the same time, the flipping mechanism lacks precise control, which easily leads to premature flipping before the upper surface is finished or insufficient flipping angle, ultimately resulting in missed or uneven spraying on the axle surface. 2. After the axle is painted, it needs to be air-dried in time to ensure the adhesion of the coating. In the existing technology, independent air-drying equipment is mostly used, which not only requires additional power and increases production energy consumption, but also has problems such as uneven drying range and unstable wind speed, resulting in poor paint leveling effect. Summary of the Invention

[0004] The purpose of this invention is to provide a vehicle axle semi-finished product tilting and conveying device to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions: A semi-finished axle flipping and conveying device includes symmetrically arranged supports on both sides. A rotating rod is mounted on one side of each support, with a central disc fixedly mounted at the other end of each rotating rod. Multiple telescopic plates are circumferentially fixed along the outer edge of the central disc. A hollow frame is fixedly mounted between two symmetrically arranged telescopic plates on the two central discs. A vehicle axle is detachably mounted on both sides of the hollow frame via mounting parts. A symmetrically arranged control group is provided on the mounting parts on both sides. When the control group rotates along the axis of the rotating rod with the hollow frame, the drive unit drives the control group, thereby causing the mounting parts on both sides to release the clamping installation of the vehicle axle. A flipping part is provided on the side of the mounting parts that is furthest from each other. When the flipping part rotates along the axis of the rotating rod with the hollow frame to a certain position, it contacts a stop group, thereby driving the flipping part to flip the vehicle axle.

[0006] Preferably, symmetrically arranged right-angle frames are installed on both sides of the hollow frame. A sliding column is slidably installed in the middle of the horizontal section of the right-angle frame. A stop ring is slidably installed on the outside of the sliding column. A spring is also sleeved on the outside of the sliding column. One end of the spring is connected to the stop ring, and the other end of the spring is fixed to the right-angle frame.

[0007] Preferably, the control group includes two symmetrically arranged guide plates fixed to the hollow frame. A slide rod is slidably installed in the middle of each of the two guide plates, and a symmetrical driven wedge block is provided on the side of the two slide rods that are close to each other. The ends of the two slide rods away from the driven wedge block are respectively fixed to their corresponding sliding columns.

[0008] Preferably, the drive unit includes an active wedge block located on the same plane in the middle of the two driven wedge blocks. An electric push plate is fixedly installed on the top of the active wedge block, and the end of the electric push plate away from the active wedge block is connected to a bracket on one side through a hanging plate.

[0009] Preferably, the flipping part includes two brackets installed outside the hollow frame and a shaft installed in the middle of the vertical section of the right-angle frame. The two brackets support the two shafts respectively. The flipping part also includes two symmetrically arranged support plates installed outside the hollow frame. A guide shaft is fixedly installed on the support plate. A rocker is rotatably installed on the outside of the guide shaft. An outer edge frame is fixedly installed on one side of the right-angle frame. A swing plate is rotatably installed in the middle of the outer edge frame and its corresponding bracket. An active block is also provided on the rocker. A support frame is fixedly installed on the inner side of the bracket. A stop block is provided on the upper part of the support frame, which is on the same plane as the multiple active blocks.

[0010] Preferably, the inner cavity of the hollow frame is provided with a U-shaped tube for blowing and drying multiple air pipes. One side of the U-shaped tube is connected to an air supply pipe, and the end of the air supply pipe away from the U-shaped tube is connected to the drying unit.

[0011] Preferably, the drying unit includes an air cylinder fixed to a hollow frame, a piston rod slidably mounted in the middle of the air cylinder, a slider fixedly mounted at the bottom of the piston rod, a track plate connected to a bracket at the rear of the slider, a spring sleeved on the outside of the piston rod above the slider, a track groove opened on the side of the track plate facing the slider, and the slider slides into the track groove after rotating to a certain position.

[0012] Preferably, a rotating ring is mounted on the outside of the central disk via an electric slip ring, and multiple circumferentially arranged ear plates are fixedly mounted on the outside of the rotating ring. The ear plates and their corresponding telescopic plates are hinged together with a push-pull plate.

[0013] The beneficial effects of this invention are: 1. This invention uses an electric slip ring to drive the rotating ring to rotate. The ear plate drives the telescopic plate to extend and retract via a push-pull plate, adjusting the height of the hollow frame so that the active block and the blocking block are precisely aligned or misaligned. When switching positions, the active block contacts the blocking block, driving the rocker plate and the shaft to rotate together, causing the right-angle frame and the axle to flip over, ensuring that the top and bottom surfaces of the axle are fully coated, avoiding missed spraying and drips. At the same time, it can be adapted to axles of different lengths and diameters, improving the versatility of the device.

[0014] 2. The present invention connects the air cylinder through the hollow frame inner cavity hollow tube. When the hollow frame rotates, it drives the air cylinder slider into the track groove. The track groove guides the slider to press down the piston rod, so that the gas in the air cylinder is blown to the axle through the air supply pipe and the hollow tube from the blower pipe. It can automatically dry without additional power, accelerate the leveling of paint and the evaporation of solvent, and reduce paint accumulation.

[0015] 3. The present invention uses a sliding column, spring, and stop ring to achieve automatic centering and clamping of the axle, avoiding rigid damage. The motor drives the rotating rod and center plate to rotate, allowing multiple hollow frames to switch to each work station. During unloading, the electric push plate drives the active wedge block to squeeze the driven wedge block, and the linkage slide rod and sliding column release the axle, eliminating the need for manual operation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall front structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall side structure of the present invention.

[0019] Figure 3 This is the present invention. Figure 2 A magnified structural diagram of part a.

[0020] Figure 4 This is a partial cross-sectional view of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure between the two supports of the present invention.

[0022] Figure 6 This is a schematic diagram of the relationship between any hollow frame upper structure and the axle in this invention.

[0023] Figure 7 This is a schematic diagram of the structure between any one set of air cylinders and track plates of the present invention.

[0024] Figure 8 This is a schematic diagram of the hollow frame structure in this invention.

[0025] The attached figures are labeled as follows: 1. Bracket, 10. Rotating rod, 11. Center plate, 111. Rotating ring, 112. Ear plate, 113. Push-pull plate, 12. Telescopic plate, 13. Hollow frame, 131. Air blower, 132. U-shaped tube, 14. Right angle frame, 2. Bracket, 21. Shaft, 22. Support plate, 23. Guide shaft, 24. Rocker, 25. Outer edge frame, 26. Swing plate, 27. Active block, 28. Support frame, 29. Stopping block, 3. Guide plate, 31. Sliding rod, 32. Driven wedge block, 321. Active wedge block, 322. Electric push plate, 33. Sliding column, 34. Stopping ring, 4. Air cylinder, 41. Piston rod, 42. Slider, 43. Track plate, 44. Track groove. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figure 1-8As shown, the present invention is a semi-finished axle flipping and conveying device, including symmetrically arranged supports 1 on both sides. A rotating rod 10 is mounted on the side of the two supports 1 that is close to each other via a motor. A central plate 11 is fixedly mounted on the end of the two rotating rods 10 that is close to each other. Multiple telescopic plates 12 are circumferentially fixed along the outer edge of the central plate 11. A hollow frame 13 is fixedly mounted between two symmetrically arranged telescopic plates 12 on the two central plates 11. Axles are detachably mounted on both sides of the hollow frame 13 via mounting parts. Control groups are symmetrically arranged on the mounting parts on both sides. When the control groups rotate along the axis of the rotating rod 10 with the hollow frame 13, the drive unit drives the control groups, thereby causing the mounting parts on both sides to release the clamping installation of the axles. A flipping part is provided on the side of the mounting parts that is far apart from each other. When the flipping part rotates to a certain position along the axis of the rotating rod 10 with the hollow frame 13, it contacts the blocking group, thereby driving the flipping part to cause the mounting part to flip the axles.

[0028] In use, multiple axles are first secured by mounting one side between two mounting sections. The motor is then turned on, causing the rotating rod 10 to rotate. As the rod rotates, it moves multiple telescopic plates 12 arranged circumferentially on the central disc 11, thus shifting the position of the axles that have been installed on the mounting sections. Since the external painting equipment always paints the axles at one station, the rotation and repositioning of axles at multiple stations allows for continuous painting operations. Furthermore, while multiple axles are being rotated, the flipping section on the outer side of any axle, rotating along the axis of the rotating rod 10, is blocked by a stop group, allowing the axle to be flipped. It should be noted that the flipping conveyor is used during the painting of semi-finished axles primarily to ensure even paint coverage on all surfaces. Flipping ensures thorough painting of the top and bottom surfaces, preventing missed areas, drips, and paint accumulation. It also facilitates paint drying and solvent evaporation, improving coating uniformity and adhesion, ensuring appearance and corrosion resistance, and meeting the continuous production requirements of automated painting lines. The hollow frame 13 has symmetrically arranged right-angle frames 14 on both sides. A sliding column 33 is slidably installed in the middle of the horizontal section of the right-angle frame 14. A stop ring 34 is slidably installed on the outside of the sliding column 33. A spring is also sleeved on the outside of the sliding column 33. One end of the spring is connected to the stop ring 34, and the other end of the spring is fixed to the right-angle frame 14.

[0029] The sliding posts 33 on both sides move closer to or further away from each other on the right-angle frames 14, thus enabling the clamping of the axle before painting and its disassembly after painting. The spring mechanism allows the sliding posts 33 to slide along the sliding posts 33 when they are inserted into the round tubes on both sides of the axle, and under the force of the springs, they abut against the stop rings 34 on both sides until they abut against the sides of the round tubes of the axle. The control group includes two symmetrically arranged guide plates 3 fixed to the hollow frame 13. A slide rod 31 is slidably installed in the middle of the two guide plates 3, and a symmetrical driven wedge block 32 is provided on the side of the two slide rods 31 that is close to each other. The ends of the two slide rods 31 away from the driven wedge block 32 are respectively fixed to their corresponding sliding columns 33.

[0030] When the mounting parts on both sides are moved away from each other, the driven wedge blocks 32 on both sides are pushed downwards, causing them to move away from each other. At the same time, the sliding rods 31 on both sides slide within the guide plate 3, following their corresponding driven wedge blocks 32. As the sliding rods 31 move away from each other, they drive the sliding columns 33 on both sides to move within the corresponding right-angle frames 14 until the sliding columns 33 compress the springs and disengage from the axle. At this point, the axle loses the fixation of the sliding columns 33 and falls downwards under gravity. Compared with existing devices, this invention eliminates the need for manual unloading of the axle after painting during the painting process. The drive unit includes an active wedge block 321 located on the same plane in the middle of the two driven wedge blocks 32. An electric push plate 322 is fixedly installed on the top of the active wedge block 321. One end of the electric push plate 322 away from the active wedge block 321 is connected to a bracket 1 on one side through a hanging plate.

[0031] When the painting work is completed on both the upper and lower sides of the axle, and the rotating rod 10 drives the axles on the multiple hollow frames 13 to rotate and reposition along the axis of the rotating rod 10, the electric push plate 322 is activated to drive the active wedge block 321 to move downward. When the active wedge block 321 moves downward, it squeezes the driven wedge blocks 32 on both sides, thereby moving the sliding columns 33 on both sides away from each other, thus completing the unloading of the axle after painting. The flipping section includes two brackets 2 installed on the outside of the hollow frame 13, and a shaft 21 installed in the middle of the vertical section of the right-angle frame 14. The two brackets 2 support the two shafts 21 respectively. The flipping section also includes two symmetrically arranged support plates 22 installed on the outside of the hollow frame 13. A guide shaft 23 is fixedly installed on the support plate 22. A rocker 24 is rotatably installed on the outside of the guide shaft 23. An outer edge frame 25 is fixedly installed on one side of the right-angle frame 14. A swing plate 26 is rotatably installed in the middle of the outer edge frame 25 and its corresponding bracket 2. An active block 27 is also provided on the rocker 24. A support frame 28 is fixedly installed on the inner side of the bracket 1. A stop block 29 is provided on the upper part of the support frame 28, which is in the same plane as the multiple active blocks 27.

[0032] After the upper surfaces of multiple axles have been painted, the motor starts, driving the rotating rod 10 and the center plate 11 to rotate, causing the axles on the multiple hollow frames 13 to rotate and change position. When the driving block 27 on any hollow frame 13 comes into contact with the blocking block 29 during rotation, the driving block 27 will move downwards due to the blocking block 29. As the driving block 27 moves downwards, it drives the rocker plate 24 to rotate at a certain angle on the guide shaft 23. At this time, the shaft 21 on the side of the rocker plate 24 away from the driving block 27 will be lifted upwards as one end of the rocker plate 24 rotates. At this time, the shaft 21 moves out from the top of the bracket 2, and the swing plate 26 swings to the other side as the right angle frame 14 and the outer edge frame 25 move upwards. At this time, the right angle frame 14 drives the hollow frame 13 and the axles to flip over. When the driving block 27 loses the blocking block 29, the shaft 21 sits on the top of the bracket 2 again after the axle flips over. The hollow frame 13 has a hollow tube 132 in its inner cavity for blowing and drying multiple air pipes 131. One side of the hollow tube 132 is connected to an air supply pipe, and the end of the air supply pipe away from the hollow tube 132 is connected to the drying unit.

[0033] When multiple hollow frames 13 rotate and reposition, when the slider 42 on any air cylinder 4 rotates into the track groove 44, guided by the track groove 44, the slider 42 will drive the piston rod 41 to move downward inside the air cylinder 4 as the hollow frame 13 drives the air cylinder 4 to rotate. This causes the gas inside the air cylinder 4 to be transported through the air delivery pipe to the return tube 132 and finally blown onto the axle surface coated with paint through multiple air blowing pipes 131, thereby accelerating the drying of the axle paint. The drying unit includes an air cylinder 4 fixed to the hollow frame 13. A piston rod 41 is slidably mounted in the middle of the air cylinder 4. A slider 42 is fixedly mounted at the bottom of the piston rod 41. A track plate 43 connected to the bracket 1 is provided behind the slider 42. A spring is sleeved on the outside of the piston rod 41 and located above the slider 42. A track groove 44 is opened on the side of the track plate 43 facing the slider 42. After the slider 42 rotates to a certain position, it enters the track groove 44 and slides.

[0034] A rotating ring 111 is mounted on the outside of the central disc 11 via an electric slip ring. Multiple circumferentially arranged ear plates 112 are fixedly mounted on the outside of the rotating ring 111. The ear plates 112 and their corresponding telescopic plates 12 are hinged together with a push-pull plate 113.

[0035] The electric slip ring drives the rotating ring 111 to rotate. When the rotating ring 111 rotates, it can drive multiple ear plates 112 to rotate along the axis of the central plate 11. When the ear plates 112 rotate, they drive the telescopic sections of their corresponding telescopic plates 12 to slide up and down through the push-pull plate 113, thereby making the distance between multiple hollow frames 13 closer or farther away from each other. By adjusting the height of the hollow frame 13, the height of the active block 27 can be adjusted, so that when multiple axles have not completed the continuous painting operation on the upper surface, the active block 27 and the stop block 29 are not on the same plane. That is, multiple axles will not be flipped when the upper surface painting is not completed. The electric slip ring drives the rotating ring 111 to rotate, and the ear plates 112 drive the telescopic plates 12 to extend and retract through the push-pull plate 113, changing the height of the hollow frame 13. This allows the device to be adapted to axle semi-finished products of different lengths and diameters, improving the versatility of the device. When the telescopic plate 12 raises the hollow frame 13, the active block 27 and the blocking block 29 are misaligned and do not contact each other. The axle only changes position and does not flip over. After the upper surface is painted, the hollow frame 13 is lowered so that the active block 27 and the blocking block 29 are aligned to trigger the flipping, thus avoiding premature flipping before the painting is finished and ensuring a stable painting sequence. The gas inside the air cylinder 4 is evenly distributed to multiple air pipes 131 through the loop tube 132. After the axle is flipped, air is blown on the top, bottom and sides at the same time to accelerate the leveling of paint and solvent evaporation, reduce sagging and paint accumulation and improve coating adhesion. The rotation of the hollow frame 13 drives the slider 42 into the track groove 44. The groove forces the slider 42 to move down and compresses the piston rod 41 to supply air into the air cylinder 4. The air drying can be automatically started at a fixed position without additional power, simplifying control and reducing energy consumption. The sliding columns 33 on both sides are inserted into the round tubes at both ends of the axle. The spring pushes the stop ring 34 to press the axle end face, which not only achieves automatic centering, but also avoids damage to the finishing surface by rigid clamping, and improves clamping stability and product qualification rate. When the rotating rod 10 drives the hollow frame 13 to the unloading position, the electric push plate 322 drives the active wedge block 321 to press down the driven wedge block 32, causing the sliding rod 31 and the sliding column 33 to move outward and release the axle, so as to achieve precise positioning and synchronous and reliable automated unloading. The motor drives the rotating rod 10 and the center plate 11 to rotate, and multiple hollow frames 13 are switched to the spraying, flipping, air drying and unloading stations in sequence to form a closed-loop production line, which greatly improves the continuity and production efficiency of axle painting. When the active block 27 is pressed down by the blocking block 29, the rocker 24 rotates around the guide shaft 23, lifting the axle 21 to flip the right-angle frame 14, the hollow frame 13 and the axle as a whole. After flipping, the axle 21 falls back to the support bracket 2.

[0036] The above description is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. A semi-finished axle tilting and conveying device, comprising supports (1) symmetrically arranged on both sides, characterized in that, Two brackets (1) are mounted with rotating rods (10) on their adjacent sides via motors. A central plate (11) is fixedly mounted on the adjacent ends of the two rotating rods (10). Multiple telescopic plates (12) are fixedly mounted around the outer edge of the central plate (11). A hollow frame (13) is fixedly mounted between the two symmetrical telescopic plates (12) on the two central plates (11). A vehicle axle is detachably mounted on both sides of the hollow frame (13) via mounting parts. A symmetrically arranged control group is provided on the mounting parts on both sides. When the control group rotates along the axis of the rotating rod (10) with the hollow frame (13), the drive unit drives the control group to remove the clamping installation of the vehicle axle by the mounting parts on both sides. A flipping part is provided on the side of the mounting parts on both sides that are far apart from each other. When the flipping part rotates along the axis of the rotating rod (10) with the hollow frame (13) to a certain position, it drives the flipping part to flip the vehicle axle by contacting the blocking group.

2. The axle semi-finished product tilting and conveying device according to claim 1, characterized in that, The hollow frame (13) is equipped with symmetrically arranged right-angle frames (14) on both sides. A sliding column (33) is slidably installed in the middle of the horizontal section of the right-angle frame (14). A stop ring (34) is slidably installed on the outside of the sliding column (33). A spring is also sleeved on the outside of the sliding column (33). One end of the spring is connected to the stop ring (34), and the other end of the spring is fixed to the right-angle frame (14).

3. The axle semi-finished product tilting and conveying device according to claim 2, characterized in that, The control group includes two symmetrically arranged guide plates (3) fixed to the hollow frame (13). A slide rod (31) is slidably installed in the middle of the two guide plates (3). A driven wedge block (32) is provided on the side of the two slide rods (31) that is close to each other. The end of the two slide rods (31) away from the driven wedge block (32) is fixed to its corresponding sliding column (33).

4. The axle semi-finished product tilting and conveying device according to claim 3, characterized in that, The drive unit includes an active wedge (321) located on the same plane in the middle of the two driven wedges (32). An electric push plate (322) is fixedly installed on the top of the active wedge (321). The end of the electric push plate (322) away from the active wedge (321) is connected to a bracket (1) on one side through a hanging plate.

5. The axle semi-finished product tilting and conveying device according to claim 4, characterized in that, The flipping part includes two brackets (2) installed outside the hollow frame (13) and a shaft (21) installed in the middle of the vertical section of the right angle frame (14). The two brackets (2) support the two shafts (21) respectively. The flipping part also includes two symmetrically arranged support plates (22) installed outside the hollow frame (13). A guide shaft (23) is fixedly installed on the support plate (22). A rocker (24) is rotatably installed on the outside of the guide shaft (23). An outer edge frame (25) is fixedly installed on one side of the right angle frame (14). A swing plate (26) is rotatably installed between the middle of the outer edge frame (25) and its corresponding bracket (2). An active block (27) is also provided on the rocker (24). A support frame (28) is fixedly installed on the inner side of the bracket (1). A stop block (29) is provided on the upper part of the support frame (28) and is in the same plane as the multiple active blocks (27).

6. The axle semi-finished product tilting and conveying device according to claim 1, characterized in that, The hollow frame (13) has a hollow tube (132) for blowing and drying multiple air pipes (131) inside. One side of the hollow tube (132) is connected to an air supply pipe, and the end of the air supply pipe away from the hollow tube (132) is connected to the drying group.

7. The axle semi-finished product tilting and conveying device according to claim 6, characterized in that, The drying unit includes an air cylinder (4) fixed to a hollow frame (13). A piston rod (41) is slidably installed in the middle of the air cylinder (4). A slider (42) is fixedly installed at the bottom of the piston rod (41). A track plate (43) connected to the bracket (1) is provided behind the slider (42). A spring is sleeved on the outside of the piston rod (41) and located above the slider (42). A track groove (44) is opened on the side of the track plate (43) facing the slider (42). The slider (42) slides in the track groove (44) after rotating to a certain position.

8. The axle semi-finished product tilting and conveying device according to claim 7, characterized in that, The outside of the central disk (11) is mounted with a rotating ring (111) via an electric slip ring. Multiple circumferentially arranged ear plates (112) are fixedly mounted on the outside of the rotating ring (111). The ear plates (112) and their corresponding telescopic plates (12) are hinged together with a push-pull plate (113).

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