Polyurethane sealing element trimming device

Abstract

A polyurethane sealing element trimming device relates to the field of polyurethane sealing element production and comprises a supporting disc, a clamping mechanism and a trimming mechanism, and the clamping mechanism and the trimming mechanism are arranged on the supporting disc. The clamping mechanism comprises a pressing disc and a tight supporting assembly, a tray is rotationally arranged on the supporting disc, the pressing disc is arranged above the tray, and the tight supporting assembly is used for evenly supporting the sealing part open from inside to outside and comprises an elastic bag arranged on the upper surface of the tray; the trimming mechanism comprises a trimming position adjusting assembly arranged on one side of the supporting disc. The upper face and the lower face of the sealing piece are clamped through a tray and a pressing disc in the clamping mechanism, the sealing piece is evenly expanded from inside to outside through the tight expanding assembly, the tight expanding assembly adopts an elastic bag capable of being filled with fluid, and the sealing pieces with different diameters can be evenly expanded by being filled with the fluid; and finally, the edge of the outer ring of the rotating sealing element is cut and trimmed through the trimming mechanism, and the uniform trimming effect is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of polyurethane seal production, in particular to a polyurethane seal finishing device. Background Art

[0002] As an important industrial component, polyurethane seals are widely used in many fields. Polyurethane materials have gradually attracted attention due to their unique molecular structure and performance advantages. It has good wear resistance, elasticity and mechanical strength, can maintain stable physical properties in a wide temperature range, and has strong chemical corrosion resistance. These characteristics make polyurethane seals an ideal choice to solve the problems of traditional seals.

[0003] During the molding process of polyurethane seals, burrs are inevitable due to the influence of various factors such as the mold parting surface matching accuracy, injection pressure, and material fluidity. However, the burrs on the outer ring of the seal need to be strictly removed, otherwise the installation and use of the seal will be affected, and the sealing performance and assembly accuracy requirements of the seal cannot be met by high-precision equipment. However, the high hardness and strong toughness of polyurethane materials make it more difficult to repair burrs. The previous simple trimming method with cutting tools is inefficient and difficult to ensure the accuracy and surface quality of the outer ring of the seal after repair. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To achieve the above-mentioned purpose, the present invention proposes a polyurethane seal trimming device, comprising a support plate, and a clamping mechanism and a trimming mechanism arranged on the support plate, the clamping mechanism comprising a pressure plate and a tightening assembly, wherein a tray is rotatably arranged on the support plate, the pressure plate is arranged above the tray, the pressure plate is used to tighten the upper and lower end surfaces of the seal, the tightening assembly is arranged between the tray and the pressure plate, the tightening assembly is used to evenly stretch the seal from the inside to the outside, the tightening assembly comprises an elastic bag arranged on the upper surface of the tray, the elastic bag is a fluid-fillable elastic bag body, the trimming mechanism comprises a trimming position adjustment assembly arranged on one side of the support plate, the trimming position adjustment assembly comprises a cutting blade and an adjusting rod, wherein the adjusting rod is arranged on one side of the support plate, the cutting blade is rotatably arranged on the adjusting rod, and the cutting blade is located on the outside of the tightening assembly.

[0006] Furthermore, a tightening drive assembly is provided on the support plate, and the tightening drive assembly is used to adjust the tightening radius of the elastic bag. The tightening drive assembly includes a hydraulic pump and a buffer tube. A hydraulic oil tank is provided at the bottom of the support plate, and the hydraulic oil tank is connected to the input end of the hydraulic pump. The output end of the hydraulic pump is connected to the buffer tube. The buffer tube is connected to the elastic bag by setting a hydraulic transmission pipe.

[0007] Furthermore, a pressure-limiting reflux valve is provided at the output end of the hydraulic pump, and the pressure-limiting reflux valve is connected to the hydraulic oil tank.

[0008] Furthermore, an annular corrugated sleeve is arranged on the outside of the elastic bag, and the corrugated sleeve is a foldable structure. A pressure plate positioning groove is arranged on the top of the elastic bag, and a pressure plate positioning rod which is adapted to the pressure plate positioning groove is arranged at the middle position of the bottom of the pressure plate.

[0009] Furthermore, a joint swivel is provided at the bottom of the elastic bag, and the joint swivel is rotatably connected to the hydraulic transmission pipe.

[0010] Furthermore, an electric cylinder bracket is provided on one side of the support plate, an electric cylinder is provided on the electric cylinder bracket, a push rod is provided on the output shaft of the electric cylinder, and the push rod is rotatably connected to the pressure plate.

[0011] Furthermore, the adjusting rod is a C-shaped structure, and a positioning component for locating the adjusting rod is arranged inside the supporting plate, and the positioning component includes an adjusting groove, a locking rod and a locking head, wherein the adjusting groove is opened inside the supporting plate, one end of the adjusting rod is slidably arranged inside the adjusting groove, and the locking rod is rotatably arranged inside the adjusting rod, the locking head is arranged at one end of the locking rod located in the adjusting groove, and a handle is arranged at the end of the locking rod away from the locking head.

[0012] Furthermore, a trimming motor is arranged at the other end of the adjusting rod, the cutting disc is connected to the power shaft of the trimming motor, a cutting blade is arranged at the rotating edge portion of the cutting disc, and a grinding disc is arranged at the end face of the cutting disc.

[0013] Furthermore, a rotation driving mechanism is provided on one side of the support disk, and the rotation driving mechanism is used to drive the tray to rotate, including a driving motor and a gear plate, wherein a protective cover is provided on one side of the support disk, the driving motor is arranged inside the protective cover, a driving gear is provided on the power shaft of the driving motor, and the gear plate is arranged on the edge portion of the tray, and the driving gear and the gear plate are meshed with each other.

[0014] Beneficial effects: The present invention clamps the upper and lower surfaces of the seal by the tray and the pressure plate in the clamping mechanism, and evenly expands the seal from the inside to the outside by the tightening component. The tightening component adopts a fluid-fillable elastic bag, which can adapt to the uniform expansion of seals of different diameters by filling with fluid; finally, the outer ring edge of the rotating seal is cut and trimmed by the trimming mechanism to achieve a uniform trimming effect.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 It is a schematic diagram of the overall structure of a polyurethane sealing component trimming device according to one embodiment of the present invention; Figure 2 It is a partial structural schematic diagram of a polyurethane sealing component trimming device according to an embodiment of the present invention; Figure 3 A partial front cross-sectional view of a polyurethane seal trimming device according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified view of middle; Figure 5 for Figure 3 Enlarged view of middle B; Figure 6 A cross-sectional view of a tightening drive assembly in a polyurethane seal trimming device according to an embodiment of the present invention; Figure 7 A front view of a tightening assembly in a polyurethane seal trimming device according to an embodiment of the present invention; Figure 8 A front cross-sectional view of a tightening assembly in a polyurethane seal trimming device according to an embodiment of the present invention; Fig. 9 It is a partial top cross-sectional view of a polyurethane seal trimming device according to one embodiment of the present invention.

[0017] As shown in the figure: 1. Support plate; 11. Base; 2. Clamping mechanism; 21. Electric cylinder; 22. Electric cylinder bracket; 221. Push rod; 222. Pressure plate swivel seat; 23. Pressure plate; 24. Tightening assembly; 241. Pressure plate positioning groove; 242. Elastic bag; 243. Corrugated sleeve; 244. Fixing buckle; 245. Pressure plate positioning rod; 25. Tray; 26. Tightening drive assembly; 261. Drive protection shell; 262. Hydraulic pump; 263. Hydraulic oil tank; 264. Buffer tube; 265. Pressure limit Return valve; 266, hydraulic transmission pipe; 267, transmission joint; 268, joint swivel; 3, dressing mechanism; 31, dressing position adjustment component; 311, cutting disc; 312, grinding disc; 313, dressing motor; 314, adjustment rod; 32, positioning component; 321, adjustment groove; 322, locking rod; 323, locking head; 324, damping slider; 325, handle; 4, rotation drive mechanism; 41, protective cover; 42, driving gear; 43, driving motor; 44, gear disc. DETAILED DESCRIPTION

[0018] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0019] The polyurethane seal trimming device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0020] like Figure 2 and Figure 3 As shown, the polyurethane seal trimming device provided by the embodiment of the present invention comprises a support plate 1, and a clamping mechanism 2 and a trimming mechanism 3 arranged on the support plate 1, and a base 11 is arranged at the bottom of the support plate 1.

[0021] The clamping mechanism 2 includes a pressure plate 23 and a tightening assembly 24, wherein a tray 25 is rotatably arranged on the support plate 1, the pressure plate 23 is arranged above the tray 25, the pressure plate 23 is used to tighten the upper and lower end surfaces of the seal, the tightening assembly 24 is arranged between the tray 25 and the pressure plate 23, the tightening assembly 24 is used to evenly stretch the seal from the inside to the outside, and the tightening assembly 24 includes an elastic bag 242 arranged on the upper surface of the tray 25, and the elastic bag 242 is a fluid-fillable elastic bag.

[0022] The trimming mechanism 3 includes a trimming position adjustment component 31 arranged on one side of the support plate 1, and the trimming position adjustment component 31 includes a cutting blade 311 and an adjustment rod 314, wherein the adjustment rod 314 is arranged on one side of the support plate 1, and the cutting blade 311 is rotatably arranged on the adjustment rod 314, and the cutting blade 311 is located on the outside of the tightening component 24.

[0023] Specifically, in the process of trimming the edge of the polyurethane seal, the seal is first placed on the tray 25 and the seal is sleeved on the outer periphery of the tightening assembly 24, and then the pressure plate 23 is pressed downward, and then the elastic bag 242 is filled with fluid, and the elastic bag 242 expands into a round cake shape, and then the elastic bag 242 completely stretches the seal outward from the inside out, so that the outer surface of the seal is more stable, and then the seal is driven to rotate together by rotating the tray 25, and the position of the adjusting rod 314 is adjusted so that the cutting blade 311 can touch the outer ring edge of the seal. As the seal rotates, the cutting blade 311 cuts and removes the edge burrs of the seal. After the seal is trimmed, the tray 25 stops rotating, the fluid in the elastic bag 242 flows out, the elastic bag 242 shrinks, the pressure plate 23 is taken out upward, and finally the trimmed seal is taken out from the tray 25.

[0024] In one embodiment of the present invention, Figure 3 and Figure 6 As shown, a tightening drive assembly 26 is provided on the support plate 1, and the tightening drive assembly 26 is used to adjust the tightening radius of the elastic bag 242. The tightening drive assembly 26 includes a hydraulic pump 262 and a buffer tube 264. A driving protection shell 261 is provided at the bottom of the support plate 1. A hydraulic oil tank 263 is provided inside the driving protection shell 261. The hydraulic oil tank 263 is connected to the input end of the hydraulic pump 262. The output end of the hydraulic pump 262 is connected to the buffer tube 264. The buffer tube 264 is connected to the elastic bag 242 by providing a hydraulic transmission pipe 266. A pressure-limiting reflux valve 265 is provided at the output end of the hydraulic pump 262, and the pressure-limiting reflux valve 265 is connected to the hydraulic oil tank 263.

[0025] Specifically, in the process of the elastic bag 242 expanding and tightening the seal, the hydraulic oil is transferred to the buffer tube 264 through the hydraulic pump 262, and finally the hydraulic oil fills the elastic bag 242. The buffer tube 264 enables the elastic bag 242 to have a pressure regulating function. When the seal is tightened, the more hydraulic oil there is in the buffer tube 264, the greater the pressure in the buffer tube 264 and the elastic bag 242. Conversely, the less hydraulic oil there is in the buffer tube 264, the smaller the pressure in the elastic bag 242. The pressure can be adjusted according to the tightening pressure of the seal.

[0026] When the hydraulic oil in the elastic bag 242 reaches the set upper pressure limit, the hydraulic oil flows back from the pressure-limiting return valve 265 to the hydraulic oil tank 263 to prevent the pressure in the elastic bag 242 from continuing to rise.

[0027] In one embodiment of the present invention, Figure 3 , Figure 7 , Figure 8As shown, the outside of the elastic bag 242 is provided with an annular corrugated sleeve 243 by setting a fixing buckle 244, and the corrugated sleeve 243 is a foldable structure. The top of the elastic bag 242 is provided with a pressure plate positioning groove 241, and the middle position of the bottom of the pressure plate 23 is provided with a pressure plate positioning rod 245 that is mutually adapted to the pressure plate positioning groove 241. The bottom of the elastic bag 242 is provided with a joint swivel 268, and the joint swivel 268 is rotatably connected to the hydraulic transmission pipe 266. The bottom of the joint swivel 268 is connected to the hydraulic transmission pipe 266 by setting a transmission joint 267.

[0028] Specifically, during the outward expansion of the elastic sac 242, the corrugated sleeve 243 outside the elastic sac 242 protects the elastic sac 242 and prevents burrs on the surface of the seal from piercing the elastic sac 242. The diameter of the corrugated sleeve 243 expands or contracts uniformly due to the expansion of the elastic sac 242, so that the seal expands or contracts uniformly.

[0029] In one embodiment of the present invention, Figure 2 As shown, an electric cylinder bracket 22 is provided on one side of the support plate 1, an electric cylinder 21 is provided on the electric cylinder bracket 22, a push rod 221 is provided on the output shaft of the electric cylinder 21, and the bottom of the push rod 221 is rotatably connected to the pressure plate 23 by providing a pressure plate swivel seat 222.

[0030] Specifically, the pressure plate 23 is driven by the electric cylinder 21 to move up and down. When the pressure plate 23 moves downward, the upper and lower surfaces of the seal are clamped. When the pressure plate 23 moves upward, the trimmed seal can be taken out. The push rod 221 is rotatably connected to the pressure plate 23, and the pressure plate 23 can rotate freely.

[0031] In one embodiment of the present invention, Figure 3-Figure 5 As shown, the adjustment rod 314 is a C-shaped structure, and a positioning assembly 32 for positioning the position of the adjustment rod 314 is arranged inside the support plate 1. The positioning assembly 32 includes an adjustment slot 321, a locking rod 322 and a locking head 323, wherein the adjustment slot 321 is opened inside the support plate 1, one end of the adjustment rod 314 is slidably arranged inside the adjustment slot 321, and the adjustment rod 314 at this end is provided with a damping slider 324, and the locking rod 322 is rotatably arranged inside the adjustment rod 314, the locking head 323 is arranged at one end of the locking rod 322 located in the adjustment slot 321, and a handle 325 is arranged at the end of the locking rod 322 away from the locking head 323.

[0032] Specifically, in order to adapt to the outer ring of seals with different diameters, after the seal is tightened, the locking rod 322 is driven to rotate together by rotating the handle 325. When the locking head 323 is in a non-contact state with the inner wall of the adjustment groove 321, the adjustment rod 314 can be moved left and right to adjust the position. When the cutting blade 311 reaches the edge position of the seal, the adjustment rod 314 is fixed at this time. The locking head 323 is driven by rotating the handle 325 to contact and lock the inner wall of the adjustment groove 321, so that the adjustment rod 314 is fixed, and then the cutting position of the cutting blade 311 is fixed.

[0033] In one embodiment of the present invention, Figure 4 As shown, a trimming motor 313 is disposed at the other end of the adjusting rod 314 , the cutting disc 311 is connected to the power shaft of the trimming motor 313 , a cutting blade is disposed on the rotating edge portion of the cutting disc 311 , and a grinding disc 312 is disposed on the end face of the cutting disc 311 .

[0034] Specifically, during the rotational trimming process of the outer ring edge of the seal, the trimming motor 313 drives the cutting disc 311 to rotate, and the cutting blades on the edge of the cutting disc 311 cut off the burrs of the stamped corners. The side of the cutting disc 311 that contacts the seal is ground by the grinding disc 312 to make the outer ring edge of the seal more regular.

[0035] In one embodiment of the present invention, Figure 3 and Fig. 9 As shown, a rotation driving mechanism 4 is provided on one side of the support disk 1, and the rotation driving mechanism 4 is used to drive the tray 25 to rotate, and includes a driving motor 43 and a gear plate 44, wherein a protective cover 41 is provided on one side of the support disk 1, the driving motor 43 is arranged inside the protective cover 41, a driving gear 42 is provided on the power shaft of the driving motor 43, and the gear plate 44 is arranged on the edge part of the tray 25, and the driving gear 42 and the gear plate 44 are meshed with each other.

[0036] Specifically, during the rotation of the seal, the driving motor 43 drives the driving gear 42 to rotate, and the driving gear 42 engages with the toothed disk 44 on the edge of the tray 25 to drive the tray 25 to rotate, so that the sealing tray 25 is rotated and trimmed. The protective cover 41 on one side of the support plate 1 prevents the abrasive material from entering the driving gear 42 and the toothed disk 44, and cleans and protects the driving gear 42 and the toothed disk 44 to prevent jamming.

[0037] In order to clearly explain the above embodiments, refer to Figure 1-Figure 9 The specific working principle of the polyurethane seal trimming device of the present invention is as follows: in the process of trimming the edge of the polyurethane seal, the seal is first placed on the tray 25, and the seal is sleeved on the outer periphery of the tightening component 24, and then the pressure plate 23 is driven downward by the electric cylinder 21, and the pressure plate 23 moves downward to clamp the upper and lower surfaces of the seal.

[0038] The hydraulic oil is then transferred to the buffer tube 264 through the hydraulic pump 262, and the hydraulic oil fills the elastic bag 242. The buffer tube 264 enables the elastic bag 242 to have a pressure regulating function, which can be adjusted according to the tightening pressure required by the seal. When the seal is tightened, the more hydraulic oil there is in the buffer tube 264, the greater the pressure in the buffer tube 264 and the elastic bag 242, and vice versa.

[0039] By filling the elastic bag 242 with hydraulic oil, the elastic bag 242 expands into a round cake shape, and then the elastic bag 242 completely stretches the seal outward from the inside out, making the outer surface of the seal more stable. When the hydraulic oil in the elastic bag 242 reaches the set upper pressure limit, the hydraulic oil flows back from the pressure limiting return valve 265 to the hydraulic oil tank 263 to prevent the pressure in the elastic bag 242 from continuing to rise.

[0040] After the seal is tightened, the locking rod 322 is driven to rotate together by rotating the handle 325. When the locking head 323 is in a non-contact state with the inner wall of the adjustment groove 321, the adjustment rod 314 can be moved left and right to adjust the position. When the cutting blade 311 reaches the edge position of the seal, the adjustment rod 314 is fixed. The locking head 323 is driven to contact and lock with the inner wall of the adjustment groove 321 by rotating the handle 325, so that the adjustment rod 314 is fixed, and then the cutting position of the cutting blade 311 is fixed.

[0041] Then, the driving motor 43 drives the driving gear 42 to rotate, and the driving gear 42 engages with the toothed disk 44 on the edge of the tray 25 to drive the tray 25 to rotate. The rotation of the tray 25 drives the seal to rotate together. As the seal rotates, the trimming motor 313 drives the cutting disc 311 to rotate, and the cutting blade on the edge of the cutting disc 311 cuts off the burrs of the stamped corners. The side of the cutting disc 311 that contacts the seal is ground by the grinding disc 312 to make the outer edge of the seal more regular.

[0042] After the seal is trimmed, the tray 25 stops rotating, the fluid in the elastic bag 242 flows out, the elastic bag 242 shrinks, the pressure plate 23 is taken out upward, and finally the trimmed seal is taken out from the tray 25.

[0043] In summary, the polyurethane seal trimming device of the embodiment of the present invention clamps the upper and lower surfaces of the seal by the tray and the pressure plate in the clamping mechanism, and evenly stretches the seal from the inside to the outside by the tightening component. The tightening component adopts a fluid-fillable elastic bag, which can adapt to the uniform expansion of seals of different diameters by filling with fluid; finally, the outer ring edge of the rotating seal is cut and trimmed by the trimming mechanism to achieve a uniform trimming effect.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A polyurethane seal finishing device, characterized in that: It comprises a support plate (1), and a clamping mechanism (2) and a trimming mechanism (3) arranged on the support plate (1); The clamping mechanism (2) comprises a pressure plate (23) and a tightening assembly (24), wherein a tray (25) is rotatably arranged on the support plate (1), the pressure plate (23) is arranged above the tray (25), the pressure plate (23) is used to tighten the upper and lower end surfaces of the sealing member, the tightening assembly (24) is arranged between the tray (25) and the pressure plate (23), the tightening assembly (24) comprises an elastic bag (242) arranged on the upper surface of the tray (25), and the elastic bag (242) is a fluid-fillable elastic bag body; The trimming mechanism (3) comprises a trimming position adjustment component (31) arranged on one side of the support plate (1), the trimming position adjustment component (31) comprising a cutting blade (311) and an adjustment rod (314), wherein the adjustment rod (314) is arranged on one side of the support plate (1), the cutting blade (311) is rotatably arranged on the adjustment rod (314), and the cutting blade (311) is located outside the tightening component (24).

2. The polyurethane seal trimming device according to claim 1, characterized in that: The support plate (1) is provided with a tightening drive assembly (26), which is used to adjust the tightening radius of the elastic bag (242), and the tightening drive assembly (26) comprises a hydraulic pump (262) and a buffer tube (264). A hydraulic oil tank (263) is provided at the bottom of the support plate (1), the hydraulic oil tank (263) is connected to the input end of the hydraulic pump (262), the output end of the hydraulic pump (262) is connected to the buffer tube (264), and the buffer tube (264) is connected to the elastic bag (242) by means of a hydraulic transmission tube (266).

3. The polyurethane seal trimming device according to claim 2, characterized in that: A pressure-limiting reflux valve (265) is provided at the output end of the hydraulic pump (262), and the pressure-limiting reflux valve (265) is connected to the hydraulic oil tank (263).

4. The polyurethane seal trimming device according to claim 2, characterized in that: An annular corrugated sleeve (243) is arranged outside the elastic bag (242), and the corrugated sleeve (243) is a foldable structure. A pressure plate positioning groove (241) is arranged at the top of the elastic bag (242), and a pressure plate positioning rod (245) that is compatible with the pressure plate positioning groove (241) is arranged at the middle position of the bottom of the pressure plate (23).

5. The polyurethane seal trimming device according to claim 2, characterized in that: A joint swivel seat (268) is provided at the bottom of the elastic bag (242), and the joint swivel seat (268) is rotatably connected to the hydraulic transmission pipe (266).

6. The polyurethane seal trimming device according to claim 1, characterized in that: An electric cylinder bracket (22) is provided on one side of the support plate (1), an electric cylinder (21) is provided on the electric cylinder bracket (22), a push rod (221) is provided on the output shaft of the electric cylinder (21), and the push rod (221) is rotatably connected to the pressure plate (23).

7. The polyurethane seal trimming device according to claim 1, characterized in that: The adjusting rod (314) is of a C-shaped structure. A positioning assembly (32) for positioning the adjusting rod (314) is arranged inside the supporting plate (1). The positioning assembly (32) comprises an adjusting slot (321), a locking rod (322) and a locking head (323). The adjusting slot (321) is arranged inside the supporting plate (1). One end of the adjusting rod (314) is slidably arranged inside the adjusting slot (321). The locking rod (322) is rotatably arranged inside the adjusting rod (314). The locking head (323) is arranged at one end of the locking rod (322) located inside the adjusting slot (321). A handle (325) is arranged at one end of the locking rod (322) facing away from the locking head (323).

8. The polyurethane seal trimming device according to claim 7, characterized in that: The other end of the adjusting rod (314) is provided with a trimming motor (313), the cutting blade (311) is connected to the power shaft of the trimming motor (313), a cutting blade is provided on the rotating edge portion of the cutting blade (311), and a grinding blade (312) is provided on the end surface of the cutting blade (311).

9. The polyurethane seal trimming device according to claim 1, characterized in that: A rotation drive mechanism (4) is provided on one side of the support disk (1), and the rotation drive mechanism (4) is used to drive the tray (25) to rotate, and comprises a drive motor (43) and a toothed disk (44), wherein a protective cover (41) is provided on one side of the support disk (1), the drive motor (43) is arranged inside the protective cover (41), a drive gear (42) is provided on a power shaft of the drive motor (43), and the toothed disk (44) is arranged at an edge portion of the tray (25), and the drive gear (42) and the toothed disk (44) are meshed with each other.

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