Gear microcosmic modification equipment of vibration and noise reduction planetary reducer

Abstract

The invention belongs to the technical field of gear machining, and relates to gear microscopic modification equipment of a vibration and noise reduction planetary reducer to solve the problems that in the prior art, the end, away from an output main body, of a mounting connecting ring is fixedly connected with a bearing inner rod, and the end, away from the mounting connecting ring, of the bearing inner rod is movably sleeved with a first lantern ring; a reset spring is fixedly connected between the first lantern ring and the second lantern ring, a first outer supporting plate and a second outer supporting plate are arranged on the outer walls of the two sides of the bearing inner rod correspondingly, and the ends, away from each other, of the first outer supporting plate and the second outer supporting plate are fixedly connected with grinding plates correspondingly. And a first outer supporting plate and a second outer supporting plate are driven to be far away from the bearing inner rod, so that a grinding plate is tightly attached to the inner wall of the gear inner hole, the gear inner hole grinding device can adapt to grinding of gear inner holes with different diameters, and the problems that when gear inner holes with different hole diameters need to be ground, grinding heads with different diameters need to be replaced, operation is tedious, time and labor are wasted, and efficiency is high are solved. The production cost is increased, and the economic benefit is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gear machining, in particular to a gear micro-shaping device for a vibration and noise reduction planetary reducer. BACKGROUND

[0002] The planetary reducer is a common mechanical transmission device, mainly used for reducing the rotational speed and increasing the output torque. It is composed of a central sun gear and a plurality of planetary gears rotating around it. The planetary gears are connected to an integrated outer ring through a planet carrier. The patent number CN215214654U discloses a planetary gear reducer shell with vibration and noise reduction function, which adopts a special-shaped structure super material theory to reduce the vibration and noise of the reducer shell. According to the main noise frequency band, the special-shaped super material can be designed specifically, and combined with traditional vibration and noise isolation technology, the low-frequency vibration and noise of the planetary gear reducer can be greatly reduced, and the vibration and noise reduction effect is good. In the machining process of the central sun gear and the planetary gears rotating around it, a shaping device is needed to polish and shape the inner hole to ensure the stable operation of the planetary reducer.

[0003] The patent number CN209273095U discloses a gear inner hole polishing tool, which includes a base, a positioning assembly and a grinding wheel assembly arranged opposite to the base, and a flushing assembly arranged between the positioning assembly and the grinding wheel assembly. The positioning assembly includes a positioning frame and a positioning component arranged in an embedded manner on one side of the positioning frame facing the grinding wheel assembly. The positioning component includes at least three clamping jaws arranged in a circular manner. The clamping jaws can be translated or rotated towards or away from the center of the circle. At least one clamping jaw is provided with a positioning roller. The grinding wheel assembly includes a grinding wheel frame and a grinding wheel arranged on one side of the grinding wheel frame facing the positioning assembly. The grinding wheel frame can move towards or away from the positioning assembly. The utility model can realize accurate positioning of the gear, prevent radial runout during inner hole polishing, ensure the coaxiality of the gear inner hole and the gear pitch circle, and improve the product qualification rate. However, when polishing the inner holes of gears with different diameters, different diameter polishing heads need to be replaced, which is tedious, time-consuming and labor-intensive, increasing production costs and reducing economic benefits.

[0004] To solve the above problems, a gear micro-shaping device for a vibration and noise reduction planetary reducer is proposed. SUMMARY

[0005] The purpose of this invention is to provide a gear micro-shaping device for a vibration-damping and noise-reducing planetary reducer. The device comprises a receiving inner rod fixedly connected to the end of a mounting ring away from the output body, a first sleeve ring movably sleeved at the end of the receiving inner rod away from the mounting ring, and a second sleeve ring fixedly connected to the end of the receiving inner rod away from the mounting ring. A return spring is fixedly connected between the first and second sleeve rings. A first outer support plate and a second outer support plate are respectively provided on the outer walls of both sides of the receiving inner rod. An inclined push rod is axially connected to both sides of the first and second outer support plates, and the inclined push rods on both sides are axially connected to the mounting ring and the first sleeve ring, respectively. A grinding plate is fixedly connected to the ends of the first and second outer support plates that are far apart from each other, thereby solving the problems in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gear micro-shaping device for a vibration-damping and noise-reducing planetary reducer, comprising a mounting base plate and an output body fixedly mounted on the upper end of the mounting base plate. A movable block is slidably connected to the upper end of the mounting base plate, a positioning component is fixedly connected to one side of the movable block, a receiving plate is fixedly connected to the upper end of the positioning component, and a grinding component is fixedly connected to the output end of the output body. The grinding component includes a mounting ring with one end fixedly connected to the output end of the output body, a receiving inner rod fixedly connected to the end of the mounting ring away from the output body, a first sleeve ring movably sleeved on the end of the receiving inner rod away from the mounting ring, and a second sleeve ring fixedly connected to the end of the receiving inner rod away from the mounting ring. A return spring is fixedly connected between the first sleeve ring and the second sleeve ring. The outer walls on both sides of the receiving inner rod are respectively provided with a first outer support plate and a second outer support plate. Both sides of the first outer support plate and the second outer support plate are axially connected with inclined push rods. The inclined push rods on both sides are respectively axially connected to the mounting ring and the first ring. The ends of the first outer support plate and the second outer support plate that are far apart from each other are fixedly connected with grinding plates.

[0007] Preferably, the outer wall of the receiving plate is provided with a positioning hole, and the positioning hole is at the same horizontal line as the inner rod of the receiving plate.

[0008] Preferably, the diameter of the first collar is greater than the diameter of the second collar, and the diameter of the first collar is greater than the diameter of the positioning hole, while the diameter of the second collar is smaller than the diameter of the positioning hole.

[0009] Preferably, the positioning component includes a positioning base plate fixedly connected to the movable block, a positioning seat fixedly connected to the upper end of the positioning base plate, and a clamping mechanism fixedly connected to the upper end of the positioning seat.

[0010] Preferably, a central rotating rod is movably disposed through the center of the positioning seat, and a first screw and a second screw are fixedly connected to both sides of the central rotating rod, respectively. A first pressure block is threadedly connected to the outer wall of the first screw, and a second pressure block is threadedly connected to the outer wall of the second screw.

[0011] Preferably, the first screw and the second screw are symmetrically distributed about the center of the rotating rod, and the outer wall thread structures of the first screw and the second screw are opposite.

[0012] Preferably, the clamping mechanism includes a central block fixedly connected to the positioning seat, a clamping plate body slidably connected to both inner walls of the central block, an upper plate slidably connected to the upper end of the clamping plate body, a clamping arc plate fixedly connected to the inner wall of the upper plate, and a lower plate fixedly connected to the lower end of the clamping plate body.

[0013] Preferably, the clamping plate body has a movable groove at one end near the middle connecting block, the inner wall of the movable groove is slidably connected to a movable rod, the outer wall of the movable rod is fixedly connected to an external support spring, one end of the external support spring is fixedly connected to the inner wall bottom plate of the middle connecting block, and the other end is fixedly connected to the clamping plate body.

[0014] Preferably, the upper end of the first pressing block is slidably connected to an upper top member, and two sets of side connecting blocks are fixedly connected to one side of the first pressing block. A side connecting rod is rotatably connected between the two sets of side connecting blocks, and a side slider is threadedly connected to the outer wall of the side connecting rod. The side slider is fixedly connected to the upper top member.

[0015] Preferably, the outer walls of the side-connecting rotating rod, the first screw, and the second screw are fixedly connected to a transmission wheel, and the outer wall of the transmission wheel is connected to a transmission belt. The side-connecting rotating rod is rotatably connected to the first screw and the second screw respectively through the transmission belt.

[0016] Compared with the prior art, the beneficial effects of the present invention are: A micro-shaping device for a vibration-damping and noise-reducing planetary reducer gear utilizes the inner hole of the gear to insert a grinding component. Continuous movement of the positioning component, with the first ring having a larger diameter than the second ring and the first ring having a larger diameter than the positioning hole (which is smaller than the second ring), causes the receiving inner rod to pull the second ring into the positioning hole. The first ring moves along the outer wall of the receiving inner rod, tightening the return spring. The first ring presses against the inclined push rod, causing the first and second outer support plates to move away from the receiving inner rod, resulting in the grinding plate tightly adhering to the inner wall of the gear's inner hole. Continuous movement of the positioning component further extends the outer support plates, allowing for grinding of gear inner holes of different diameters. This solves the problem of needing to change grinding heads of different diameters when grinding gear inner holes of different diameters, which is cumbersome, time-consuming, labor-intensive, increases production costs, and reduces economic efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the gear micro-shaping device of the present invention; Figure 2 This is a schematic diagram of the overall planar structure of the gear micro-shaping device of the present invention; Figure 3 This is a schematic diagram of the grinding component structure of the gear micro-shaping device of the present invention; Figure 4 This is a schematic diagram of the positioning component structure of the gear micro-shaping device of the present invention; Figure 5 The gear micro-shaping device of the present invention Figure 4 A magnified structural diagram at point A; Figure 6 This is a schematic diagram of the clamping mechanism structure of the gear micro-shaping device of the present invention; Figure 7 This is a schematic diagram of the side connecting rod and transmission belt structure of the gear micro-shaping device of the present invention.

[0018] In the diagram: 1. Mounting base plate; 2. Output main body; 3. Positioning assembly; 31. Positioning base plate; 32. Positioning seat; 33. Clamping mechanism; 331. Middle connecting block; 332. Clamping plate main body; 333. Upper connecting plate; 334. Clamping arc plate; 335. Lower connecting plate; 336. Movable groove; 337. Movable rod; 338. External support spring; 34. First screw; 35. Second screw; 36. First pressure block 37. Second pressure block; 38. Upper ejector; 39. Side connecting block; 310. Side connecting rod; 311. Side slider; 312. Transmission belt; 4. Receiving plate; 5. Grinding assembly; 51. Mounting ring; 52. Receiving inner rod; 53. First collar; 54. Second collar; 55. Return spring; 56. First outer support plate; 57. Second outer support plate; 58. Inclined ejector rod; 59. Grinding plate; 6. Positioning hole. Detailed Implementation

[0019] 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.

[0020] Please see Figures 1-7 To address the problem of cumbersome, time-consuming, and labor-intensive operation that requires changing grinding heads of different diameters when grinding the inner bores of gears with different diameters, leading to increased production costs and reduced economic efficiency, the following preferred technical solution is provided: A gear micro-shaping device for a vibration-damping and noise-reducing planetary reducer includes a mounting base plate 1 and an output body 2 fixedly mounted on the upper end of the mounting base plate 1. A movable block is slidably connected to the upper end of the mounting base plate 1, and a positioning component 3 is fixedly connected to one side of the movable block. A receiving plate 4 is fixedly connected to the upper end of the positioning component 3. A grinding component 5 is fixedly connected to the output end of the output body 2. The grinding component 5 includes a mounting ring 51 with one end fixedly connected to the output end of the output body 2. A receiving inner rod 52 is fixedly connected to the end of the mounting ring 51 away from the output body 2. A first sleeve ring 53 is movably sleeved on the end of the receiving inner rod 52 away from the mounting ring 51, and a second sleeve ring 54 is fixedly connected to the end of the receiving inner rod 52 away from the mounting ring 51. A return spring 55 is fixedly connected between the first sleeve ring 53 and the second sleeve ring 54.

[0021] The outer walls of the receiving inner rod 52 are respectively provided with a first outer support plate 56 and a second outer support plate 57. Both sides of the first outer support plate 56 and the second outer support plate 57 are axially connected with inclined push rods 58. The inclined push rods 58 on both sides are axially connected to the mounting ring 51 and the first sleeve ring 53, respectively. The ends of the first outer support plate 56 and the second outer support plate 57 that are far apart from each other are fixedly connected with grinding plates 59. The outer wall of the receiving plate 4 is provided with a positioning hole 6, and the positioning hole 6 is on the same horizontal line as the receiving inner rod 52. The diameter of the first sleeve ring 53 is larger than the diameter of the second sleeve ring 54, and the diameter of the first sleeve ring 53 is larger than the diameter of the positioning hole 6. The diameter of the second sleeve ring 54 is smaller than the diameter of the positioning hole 6.

[0022] Specifically, when performing micro-shaping on the inner bore of the planetary reducer gear, the gear needs to be positioned using the positioning component 3. Then, the positioning component 3 is moved by the movable block, causing the gear to approach the grinding component 5. The grinding component 5 is then fitted into the inner bore of the gear. As the positioning component 3 continues to move, because the diameter of the first collar 53 is larger than the diameter of the second collar 54, and the diameter of the first collar 53 is larger than the diameter of the positioning hole 6, while the diameter of the second collar 54 is smaller than the diameter of the positioning hole 6, the receiving inner rod 52 will drive the second collar 54 into the positioning hole 6. The first collar 53 will remain outside the receiving inner rod 52. The wall moves, thereby tightening the return spring 55. The first ring 53 squeezes the inclined push rod 58, causing the first outer support plate 56 and the second outer support plate 57 to move away from the receiving inner rod 52. This makes the grinding plate 59 fit tightly against the inner wall of the gear hole. The continuous movement of the positioning component 3 can drive the first outer support plate 56 and the second outer support plate 57 to continuously support each other, so that it can adapt to grinding gear holes of different diameters. This solves the problem that when grinding gear holes of different diameters are required, it is necessary to change grinding heads of different diameters, which is cumbersome, time-consuming and labor-intensive, leading to increased production costs and reduced economic benefits.

[0023] To ensure stability during gear machining, the following preferred technical solutions are provided: The positioning component 3 includes a positioning base plate 31 fixedly connected to the movable block. A positioning seat 32 is fixedly connected to the upper end of the positioning base plate 31. A clamping mechanism 33 is fixedly connected to the upper end of the positioning seat 32. A central rotating rod is movably connected through the center of the positioning seat 32. A first screw 34 and a second screw 35 are fixedly connected to both sides of the central rotating rod, respectively. A first pressure block 36 is threadedly connected to the outer wall of the first screw 34, and a second pressure block 37 is threadedly connected to the outer wall of the second screw 35.

[0024] The first screw 34 and the second screw 35 are symmetrically distributed about the center of the transfer rod, and the outer wall thread structure between the first screw 34 and the second screw 35 is opposite. The clamping mechanism 33 includes a central block 331 fixedly connected to the positioning seat 32. The inner walls of both sides of the central block 331 are slidably connected to the clamping plate body 332. The upper end of the clamping plate body 332 is slidably connected to the upper plate 333. The inner wall of the upper plate 333 is fixedly connected to the clamping arc plate 334. The lower end of the clamping plate body 332 is fixedly connected to the lower plate 335. The end of the clamping plate body 332 near the central block 331 is provided with a movable groove 336. The inner wall of the movable groove 336 is slidably connected to the movable rod 337. The outer wall of the movable rod 337 is fixedly connected to the outer support spring 338. One end of the outer support spring 338 is fixedly connected to the inner wall bottom plate of the central block 331, and the other end is fixedly connected to the clamping plate body 332.

[0025] Specifically, when positioning and fixing the gear to be processed, it is placed between the clamping arc plates 334. The first screw 34 is connected to an external motor, and the first screw 34 and the second screw 35 rotate simultaneously through the central rotating rod. Since the outer wall thread structure between the first screw 34 and the second screw 35 is opposite, it drives the first pressure block 36 and the second pressure block 37 to move closer together, thereby pushing the lower connecting plate 335. The lower connecting plate 335 drives the clamping plate body 332 to move towards the inner wall of the central connecting block 331. Through the cooperation of the movable groove 336 and the movable rod 337, the outer support spring 338 is pressed, which drives the upper connecting plate 333 to push the clamping arc plate 334 to clamp the gear, thus completing the positioning and fixing, ensuring stability during processing. When releasing the fixation, simply use the first screw 34 and the second screw 35 to drive the first pressure block 36 and the second pressure block 37 away from each other. At this time, the reaction force of the outer support spring 338 drives the clamping arc plate 334 to release the fixation, making the operation convenient.

[0026] The upper end of the first pressure block 36 is slidably connected to the upper top member 38. Two sets of side connecting blocks 39 are fixedly connected to one side of the first pressure block 36. A side connecting rod 310 is rotatably connected between the two sets of side connecting blocks 39. A side slider 311 is threadedly connected to the outer wall of the side connecting rod 310. The side slider 311 is fixedly connected to the upper top member 38. A transmission wheel is fixedly connected to the outer wall of the side connecting rod 310, the first screw 34, and the second screw 35. A transmission belt 312 is driven to the outer wall of the transmission wheel. The side connecting rod 310 is rotatably connected to the first screw 34 and the second screw 35 respectively through the transmission belt 312.

[0027] Specifically, when the first screw 34 and the second screw 35 rotate, the transmission wheel and the transmission belt 312 will drive the side connecting rod 310 to rotate simultaneously, so that the side slider 311 drives the upper pusher 38 to move to the upper connecting plate 333, thereby pushing the clamping arc plate 334 through the upper connecting plate 333, thereby improving the fixing effect and further improving the stability during processing.

[0028] In summary: The grinding assembly 5 is fitted into the gear's inner hole, and the positioning assembly 3 is continuously moved. Because the diameter of the first collar 53 is larger than the diameter of the second collar 54, and the diameter of the first collar 53 is larger than the diameter of the positioning hole 6, while the diameter of the second collar 54 is smaller than the diameter of the positioning hole 6, the receiving inner rod 52 will drive the second collar 54 into the positioning hole 6. The first collar 53 will move on the outer wall of the receiving inner rod 52, thereby tightening the return spring 55. The first collar 53 presses against the inclined push rod 58, causing the first outer support plate 56 and the second outer support plate 57 to move away from the receiving inner rod 52, making the grinding plate 59 tightly adhere to the inner wall of the gear's inner hole. Continuous movement of the positioning assembly 3 can continuously extend the first outer support plate 56 and the second outer support plate 57, allowing it to adapt to grinding gear inner holes of different diameters. The gear to be processed is placed between the clamping arc plates 334, and the first screw 34 is externally connected... The electric motor, via the central rotating rod, causes the first screw 34 and the second screw 35 to rotate simultaneously. Because the outer wall thread structures of the first screw 34 and the second screw 35 are opposite, the first pressure block 36 and the second pressure block 37 are driven to move closer together, thereby pushing the lower connecting plate 335. The lower connecting plate 335 drives the clamping plate body 332 to move towards the inner wall of the central connecting block 331. Through the cooperation of the movable groove 336 and the movable rod 337, the outer support spring 338 is compressed, which drives the upper connecting plate 333 to push the clamping arc plate 334 to clamp the gear, thus completing the positioning and fixing. When the first screw 34 and the second screw 35 rotate, through the cooperation of the transmission wheel and the transmission belt 312, the side connecting rotating rod 310 will rotate simultaneously, causing the side slider 311 to drive the upper pusher 38 to move to the upper connecting plate 333. Thus, the upper connecting plate 333 pushes the clamping arc plate 334, thereby improving the fixing effect.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A gear micro-shaping device for a vibration-damping and noise-reducing planetary reducer, comprising a mounting base plate (1) and an output body (2) fixedly mounted on the upper end of the mounting base plate (1), wherein a movable block is slidably connected to the upper end of the mounting base plate (1), a positioning component (3) is fixedly connected to one side of the movable block, a receiving plate (4) is fixedly connected to the upper end of the positioning component (3), and a grinding component (5) is fixedly connected to the output end of the output body (2), characterized in that: The polishing assembly (5) comprises a mounting connecting ring (51) fixedly connected with the output end of the output body (2), one end of the mounting connecting ring (51) is fixedly connected with a receiving inner rod (52), one end of the receiving inner rod (52) away from the mounting connecting ring (51) is movably sleeved with a first sleeve ring (53), and the other end of the receiving inner rod (52) away from the mounting connecting ring (51) is fixedly connected with a second sleeve ring (54), and the first sleeve ring (53) and the second sleeve ring (54) are fixedly connected with a reset spring (55). The two side outer walls of the receiving inner rod (52) are respectively provided with a first outer support plate (56) and a second outer support plate (57), the two sides of the first outer support plate (56) and the second outer support plate (57) are respectively connected with an inclined jack (58), and the two sides of the inclined jack (58) are respectively connected with the mounting connecting ring (51), the first sleeve ring (53) and the second sleeve ring (54).

2. The apparatus for micro-shaping the gear of a vibration and noise reducing planetary reducer according to claim 1, characterized in that: The outer wall of the receiving plate (4) is provided with a positioning hole (6), and the positioning hole (6) and the receiving inner rod (52) are on the same horizontal line.

3. The apparatus for micro-shaping the gear of a vibration and noise reducing planetary reducer according to claim 2, characterized in that: The diameter of the first sleeve ring (53) is greater than that of the second sleeve ring (54), and the diameter of the first sleeve ring (53) is greater than that of the positioning hole (6), and the diameter of the second sleeve ring (54) is smaller than that of the positioning hole (6).

4. The apparatus for micro-shaping the gear of a vibration and noise reducing planetary reducer according to claim 1, characterized in that: The positioning assembly (3) comprises a positioning base plate (31) fixedly connected with the movable block, the upper end of the positioning base plate (31) is fixedly connected with a positioning seat (32), and the upper end of the positioning seat (32) is fixedly connected with a clamping mechanism (33).

5. The apparatus for micro-shaping the gears of a vibration and noise reducing planetary reducer according to claim 4, characterized in that: The center of the positioning seat (32) is movably penetrated by a transfer rod, the two sides of the transfer rod are respectively fixedly connected with a first screw rod (34) and a second screw rod (35), the outer wall of the first screw rod (34) is threadedly connected with a first pressing block (36), and the outer wall of the second screw rod (35) is threadedly connected with a second pressing block (37).

6. The apparatus for micro-shaping the gears of a vibration and noise reducing planetary reducer according to claim 5, characterized in that: The first screw rod (34) and the second screw rod (35) are symmetrically distributed about the center of the transfer rod, and the outer wall thread structures between the first screw rod (34) and the second screw rod (35) are opposite.

7. The apparatus for micro-shaping the gears of a vibration and noise reducing planetary reducer according to claim 6, characterized in that: The clamping mechanism (33) comprises a middle connecting block (331) fixedly connected with the positioning seat (32), the inner walls of the two sides of the middle connecting block (331) are slidably connected with a clamping plate body (332), the upper end of the clamping plate body (332) is slidably connected with an upper connecting plate (333), the inner wall of the upper connecting plate (333) is fixedly connected with a clamping arc-shaped plate (334), and the lower end of the clamping plate body (332) is fixedly connected with a lower connecting plate (335).

8. The apparatus for micro-shaping the gears of a vibration and noise reducing planetary reducer according to claim 7, characterized in that: The movable slot (336) is slidably connected with an inner wall of the movable slot (336), the outer supporting spring (338) is fixedly connected with an outer wall of the movable rod (337), one end of the outer supporting spring (338) is fixedly connected with an inner wall bottom plate of the middle connecting block (331), and the other end is fixedly connected with the clamping plate body (332).

9. The apparatus for micro-shaping the gears of a vibration and noise reducing planetary reducer according to claim 5, characterized in that: The upper end of the first pressing block (36) is slidably connected with an upper top piece (38), one side of the first pressing block (36) is fixedly connected with two groups of side connecting blocks (39), the two groups of side connecting blocks (39) are rotatably connected with a side connecting rotating rod (310), the outer wall of the side connecting rotating rod (310) is threadedly connected with a side sliding block (311), and the side sliding block (311) is fixedly connected with the upper top piece (38).

10. The apparatus for microshaping the gear of a vibration and noise reducing planetary reducer according to claim 9, characterized in that: The outer wall of the side connecting rotating rod (310), the first screw rod (34) and the second screw rod (35) is fixedly connected with a transmission wheel, the outer wall of the transmission wheel is drivingly connected with a transmission belt (312), and the side connecting rotating rod (310) is rotatably connected with the first screw rod (34) and the second screw rod (35) through the transmission belt (312).

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