Vegetable seed oscillation cleaning equipment

Abstract

The invention relates to the field of vegetable seed cleaning, and discloses vegetable seed vibration cleaning equipment which comprises a bottom plate. A transmission assembly; an oscillation assembly; a support assembly; a buffer assembly; a lifting assembly; and a cleaning assembly. By installing the transmission assembly and the oscillation assembly which are matched with each other, a first motor is started to rotate anticlockwise to drive a first rotating wheel, a third rotating wheel is driven to rotate anticlockwise through a transmission belt, and when petal-shaped blocks are pushed by a second hydraulic rod to slide along the surface of the third rotating wheel, first springs in grooves are extruded to generate elastic deformation; and when the first hydraulic rod exerts pushing force, the first springs in an annular array form a multi-direction buffering structure in the groove, when the second hydraulic rod exerts pushing force again, the first springs enable the petal-shaped blocks to generate asymmetric deformation, and therefore a composite oscillation waveform is formed, and the problem that vegetable seeds are damaged by water immersion due to the fact that the cleaning speed of a traditional water flow cleaning mode is low is solved.

Description

Technical Field

[0001] This application relates to the technical field of vegetable seed cleaning, and particularly relates to a vegetable seed oscillation cleaning device. Background Art

[0002] During the harvesting process of vegetable seeds, it is inevitable to be mixed with impurities such as fruit peels, pulp, sediment, and weed seeds. These impurities not only affect the purity of the seeds but may also carry pathogens, threatening the safety of subsequent planting. Therefore, seed cleaning has become a key link in ensuring planting quality. Currently, the widely used seed cleaning devices on the market mainly adopt methods such as air separation cleaning or water flow cleaning, but these technologies have obvious limitations in actual applications; the air separation type device separates seeds and impurities through air flow. However, when facing impurities with high adhesion such as pulp fibers, viscous gums, or sediment particles tightly adsorbed on the surface of the seeds, the cleaning effect of the device will be greatly reduced; the water flow type cleaning device uses the buoyancy and scouring force of water to separate seeds and impurities, but this method has a long cleaning cycle. During the cleaning process, the seeds need to be soaked in water for a long time. On the one hand, it will cause the seeds to absorb excessive water, damaging the seed coat structure of the seeds and affecting their activity and germination ability; on the other hand, long-term soaking may activate the enzymes in the seeds, prompting the seeds to germinate prematurely and reducing the storage life of the seeds. Summary of the Invention

[0003] This application proposes a vegetable seed oscillation cleaning device, which has the advantages of rotary oscillation cleaning, to solve the problem that the traditional water flow cleaning method has a slow cleaning speed, resulting in the damage of vegetable seeds by water immersion.

[0004] To achieve the above object, this application adopts the following technical solution: A vegetable seed oscillation cleaning device includes a bottom plate, a transmission component is fixedly installed on the top of the bottom plate, and also includes a linkage support buffer mechanism, which includes an oscillation component. The oscillation component is installed on the left side of the transmission component. A support component is sleeved on the outer edge of the oscillation component. A buffer component is movably hinged inside the support component. A lifting component is fixedly installed on the left side of the buffer component. A cleaning component is fixedly installed in the middle of the lifting component; The oscillation component includes a third runner. A plurality of arc-shaped blocks are annularly arranged on the top of the third runner. A second hydraulic rod is fixedly connected to the inner side of each of the plurality of arc-shaped blocks. A fixed ring is sleeved on the outer edge of the fixed end of each of the plurality of second hydraulic rods. The bottom of the fixed ring is fixedly connected to the top of the third runner. The telescopic ends of the plurality of second hydraulic rods are connected to a petal-shaped block. A plurality of first springs are elastically connected to the inner side of the petal-shaped block. The above structure can oscillate the circular shell during operation.

[0005] Preferably, the third runner is rotatably mounted on the top of the base plate. The petal-shaped block is annularly provided with a plurality of grooves, and the plurality of first springs are elastically connected to the grooves of the petal-shaped block in an annular array. The other ends of the plurality of first springs are connected to the inner side of the fixed ring. The top of the petal-shaped block is fixedly provided with a plurality of connecting pieces, and the petal-shaped block can slide on the top of the third runner under the push of a plurality of second hydraulic rods.

[0006] Preferably, the transmission assembly includes a trapezoidal block. The trapezoidal block is fixedly mounted on the top of the base plate. A first motor is fixedly connected to the left side of the trapezoidal block. The output shaft of the first motor is connected to a first runner. The outer edge of the first runner is sleeved with a transmission belt. The outer edge of the transmission belt is provided with a second runner. The rotating shaft of the second runner is connected to a first hydraulic rod. The above structure can drive the oscillation assembly and the circular shell to rotate during operation.

[0007] Preferably, the first runner is rotatably mounted on the top of the base plate. The fixed end of the first hydraulic rod is fixedly connected to the left side of the trapezoidal block. The second runner abuts against the outer edge of the transmission belt. The left side of the transmission belt is sleeved on the outer edge of the third runner. The diameter of the third runner is larger than that of the first runner, and the diameter of the first runner is larger than that of the second runner.

[0008] Preferably, the support assembly includes a sleeve. The inner side of the sleeve is sleeved with a circular shell, and the inner ring surface of the sleeve is provided with a plurality of trapezoidal holes.

[0009] Preferably, the bottom of the circular shell is fixedly connected to the tops of the plurality of connecting pieces. The inner wall of the sleeve is provided with an annular protrusion, and the outer edge of the circular shell is provided with an annular groove. The sleeve is movably sleeved in the groove of the circular shell through the annular protrusion.

[0010] Preferably, the buffer assembly includes four U-shaped blocks. The four U-shaped blocks are all fixedly mounted on the top of the base plate. U-shaped springs are movably hinged inside the four U-shaped blocks. The other sides of the four U-shaped springs are movably hinged to C-shaped blocks. Metal rods are vertically installed through the four C-shaped blocks. The above structure can buffer and offset the vibration generated during operation.

[0011] Preferably, the four C-shaped blocks are annularly mounted on the outer edge of the third runner, and the four C-shaped blocks are all movably hinged in the trapezoidal holes through the metal rods.

[0012] Preferably, the lifting assembly includes two track grooves. The two track grooves are fixedly mounted on the top of the base plate. Moving plates are installed inside the two track grooves. Electric wheels are installed in the contact areas between the two moving plates and the track grooves, so that the moving plates can move up and down in the track grooves. The inner sides of the two moving plates are fixedly connected to a top cover.

[0013] Preferably, the cleaning component includes a second motor fixedly installed on the top of the top cover. A triangular plate is installed on the output shaft of the second motor. A bent rod is connected to the outside of the triangular plate. A dial block is hinged to the bottom end of the bent rod. A torsion spring is installed at the hinge of the dial block and the bent rod. Three ratchets are movably hinged to the bottom of the triangular plate. The outer edges of the three ratchets are all engaged with the dial block. The bottoms of the three ratchets are fixedly connected with a brush head. The above structure can stir the water flow and clean the seeds during operation.

[0014] The beneficial effects of the present invention are as follows: 1. By installing a mutually cooperating transmission component and an oscillation component, when the first motor is started to rotate counterclockwise to drive the first runner, and then drives the third runner to rotate counterclockwise through the transmission belt. When the petal-shaped block slides along the surface of the third runner under the push of the second hydraulic rod, the first spring in the groove is squeezed to generate elastic deformation. The annularly arrayed first springs in the groove will form a multi-directional buffer structure. When the second hydraulic rod applies a thrust again, the first spring will cause the petal-shaped block to generate an asymmetric deformation, thereby forming a composite oscillation waveform, which solves the problem that the traditional water flow cleaning method has a slow cleaning speed, resulting in the damage of vegetable seeds by water immersion.

[0015] 2. By installing a buffer component, four U-shaped blocks are annularly distributed around the bottom plate. When the equipment runs and generates oscillation impacts, the U-shaped springs absorb the impacts in the vertical and horizontal directions through their own bending deformation, and at the same time, the multi-directional degrees of freedom of the hinge points are used to disperse the energy. When the C-shaped block bears the impact transmitted by the spring, the internal metal rod of it forms a sliding fit with the trapezoidal hole of the support component, converting the linear impact into a rotational motion, effectively reducing the stress concentration of the equipment structure, stabilizing the equipment, and playing a supporting role.

[0016] 3. By installing a newly designed cleaning component, after the second motor is started clockwise, it can drive the triangular plate to rotate. The brush head will generate a reverse force with the clockwise water flow and rotate counterclockwise under the drive of the second motor. The dial block engaged with the edge of the ratchet will prevent the brush head from rotating counterclockwise. The flexible material of the brush head will generate high-frequency micro-amplitude vibrations when contacting the seed surface, peeling off the attached impurities through mechanical friction, and at the same time avoiding rigid impact damage to the seed coat structure and reducing the seed damage rate. Description of the Drawings

[0017] The drawings forming a part of the specification depict the embodiments disclosed in the present application and, together with the specification, are used to explain the principles of the present application in a clear and understandable manner.

[0018] Referring to the drawings, the present disclosure can be more clearly understood according to the following detailed description, wherein: Figure 1Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the transmission component structure of the present invention; Figure 3 Schematic diagram of the oscillation component structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at A in; Figure 5 Schematic diagram of the buffer component structure of the present invention; Figure 6 Bottom view of the lifting component structure of the present invention; Figure 7 Schematic diagram of the cleaning component structure of the present invention.

[0019] Wherein: 1, bottom plate; 2, transmission component; 3, oscillation component; 4, support component; 5, buffer component; 6, lifting component; 7, cleaning component; 21, trapezoidal block; 22, first motor; 23, first runner; 24, transmission belt; 25, second runner; 26, first hydraulic rod; 31, third runner; 32, arc-shaped block; 33, second hydraulic rod; 34, fixed ring; 35, first spring; 36, petal-shaped block; 37, connecting piece; 41, sleeve; 42, round shell; 43, trapezoidal hole; 51, U-shaped block; 52, U-shaped spring; 53, C-shaped block; 54, metal rod; 61, track groove; 62, movable plate; 63, top cover; 71, second motor; 72, triangular plate; 73, ratchet; 74, bent rod; 75, dial block; 76, brush head. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0021] Please refer to Figures 1-7 , the vegetable seed oscillation cleaning device of this embodiment includes a bottom plate 1, a transmission component 2 is fixedly installed on the top of the bottom plate 1, and further includes a linkage support buffer mechanism, which includes an oscillation component 3. The oscillation component 3 is installed on the left side of the transmission component 2, a support component 4 is sleeved on the outer edge of the oscillation component 3, a buffer component 5 is movably hinged inside the support component 4, a lifting component 6 is fixedly installed on the left side of the buffer component 5, and a cleaning component 7 is fixedly installed in the middle of the lifting component 6; The oscillation component 3 includes a third runner 31. A plurality of arc-shaped blocks 32 are annularly arranged on the top of the third runner 31. A second hydraulic rod 33 is fixedly connected to the inner side of each of the plurality of arc-shaped blocks 32. A fixing ring 34 is sleeved on the outer edge of the fixed end of each of the plurality of second hydraulic rods 33. The bottom of the fixing ring 34 is fixedly connected to the top of the third runner 31. The telescopic ends of the plurality of second hydraulic rods 33 are connected to a petal-shaped block 36. A plurality of first springs 35 are elastically connected to the inner side of the petal-shaped block 36; The third runner 31 is rotatably installed on the top of the bottom plate 1. The petal-shaped block 36 is annularly provided with a plurality of grooves. The plurality of first springs 35 are elastically connected to the grooves of the petal-shaped block 36 in an annular array manner. The other ends of the plurality of first springs 35 are connected to the inner side of the fixing ring 34. A plurality of connecting pieces 37 are fixedly installed on the top of the petal-shaped block 36. The petal-shaped block 36 can slide on the top of the third runner 31 under the push of the plurality of second hydraulic rods 33; Start the first motor 22 to rotate counterclockwise to drive the first runner 23, and then drive the third runner 31 to rotate counterclockwise through the transmission belt 24. When the petal-shaped block 36 slides along the surface of the third runner 31 under the push of the second hydraulic rod 33, the first spring 35 in the groove is squeezed to generate elastic deformation. The annular array of first springs 35 will form a multi-directional buffer structure in the groove. When the second hydraulic rod 33 applies a thrust again, the first spring 35 will cause the petal-shaped block 36 to generate asymmetric deformation, thereby forming a composite oscillation waveform. The connecting piece 37 transmits the oscillation force generated by the deformation to the upper support component 4.

[0022] Among them, the transmission component 2 includes a trapezoidal block 21. The trapezoidal block 21 is fixedly installed on the top of the bottom plate 1. A first motor 22 is fixedly connected to the left side of the trapezoidal block 21. The output shaft of the first motor 22 is connected to a first runner 23. A transmission belt 24 is sleeved on the outer edge of the first runner 23. A second runner 25 is installed on the outer edge of the transmission belt 24. The rotating shaft of the second runner 25 is connected to a first hydraulic rod 26; The first runner 23 is rotatably installed on the top of the bottom plate 1. The fixed end of the first hydraulic rod 26 is fixedly connected to the left side of the trapezoidal block 21. The second runner 25 abuts against the outer edge of the transmission belt 24. The left side of the transmission belt 24 is sleeved on the outer edge of the third runner 31. The diameter of the third runner 31 is larger than that of the first runner 23, and the diameter of the first runner 23 is larger than that of the second runner 25; Start the first motor 22 to rotate counterclockwise to drive the first runner 23, and then drive the third runner 31 to rotate counterclockwise through the transmission belt 24. The first hydraulic rod 26 pushes the second runner 25 to move, which can increase the tension of the transmission belt 24.

[0023] Among them, the support component 4 includes a sleeve 41, a circular shell 42 is sleeved inside the sleeve 41, and a plurality of trapezoidal holes 43 are formed in the inner ring surface of the sleeve 41; the bottom of the circular shell 42 is fixedly connected to the tops of a plurality of connecting pieces 37, an annular protrusion is formed on the inner wall of the sleeve 41, an annular groove is formed on the outer edge of the circular shell 42, and the sleeve 41 is movably sleeved in the groove of the circular shell 42 through the annular protrusion; The first spring 35 will cause the petal-shaped block 36 to produce an asymmetric deformation, thereby forming a composite oscillation waveform, and the connecting piece 37 transmits the oscillation force generated by the deformation to the upper support component 4.

[0024] Among them, the buffer component 5 includes four U-shaped blocks 51, the four U-shaped blocks 51 are all fixedly installed on the top of the bottom plate 1, U-shaped springs 52 are movably hinged inside the four U-shaped blocks 51, the other sides of the four U-shaped springs 52 are movably hinged to C-shaped blocks 53, and metal rods 54 are installed vertically through the four C-shaped blocks 53; the four C-shaped blocks 53 are annularly installed on the outer edge of the third runner 31, and the four C-shaped blocks 53 are all movably hinged in the trapezoidal holes 43 through the metal rods 54; The four U-shaped blocks 51 are annularly distributed around the bottom plate 1. When the equipment runs and generates shock impacts, the U-shaped springs 52 absorb the impact forces in the vertical and horizontal directions through their own bending deformations, and at the same time achieve energy dispersion through the multi-directional degrees of freedom of the hinge points. When the C-shaped blocks 53 bear the impact transmitted by the springs, the internal metal rods 54 thereof form a sliding fit with the trapezoidal holes 43 of the support component 4, converting the linear impact into a rotational motion, effectively reducing the stress concentration of the equipment structure.

[0025] Among them, the lifting component 6 includes two track grooves 61, the two track grooves 61 are fixedly installed on the top of the bottom plate 1, movable plates 62 are installed inside the two track grooves 61, electric wheels are installed in the contact areas between the two movable plates 62 and the track grooves 61, so that the movable plates 62 can move up and down in the track grooves 61, and the inner sides of the two movable plates 62 are fixedly connected to a top cover 63; The top cover 63 will slowly approach the circular shell 42 during the downward movement of the movable plate 62, and at this time the cleaning component 7 can enter the circular shell 42.

[0026] Among them, the cleaning component 7 includes a second motor 71, the second motor 71 is fixedly installed on the top of the top cover 63, a triangular plate 72 is installed on the output shaft of the second motor 71, a bent rod 74 is connected to the outside of the triangular plate 72, a dial block 75 is hinged to the bottom end of the bent rod 74, a torsion spring is installed at the hinge of the dial block 75 and the bent rod 74, three ratchets 73 are movably hinged to the bottom of the triangular plate 72, the outer edges of the three ratchets 73 are all engaged with the dial block 75, and a brush head 76 is fixedly connected to the bottom of the three ratchets 73; After the second motor 71 starts clockwise, it can drive the triangular plate 72 to rotate. The brush head 76 will generate a reaction force in the opposite direction to the clockwise water flow and rotate counterclockwise under the drive of the second motor 71. The block 75 engaged with the edge of the ratchet 73 will prevent the brush head 76 from rotating counterclockwise. The flexible material of the brush head 76 will generate high-frequency and small-amplitude vibrations when contacting the seed surface, peeling off the attached impurities through mechanical friction, and at the same time avoiding damage to the seed coat structure caused by rigid impact.

[0027] Working principle: When using the present invention, first pour the seeds to be cleaned and water into the circular shell 42, then start the first motor 22 to rotate counterclockwise to drive the first runner 23, and then drive the third runner 31 to rotate counterclockwise through the transmission belt 24. The first hydraulic rod 26 pushes the second runner 25 to move, which can increase the tension of the transmission belt 24. When the petal-shaped block 36 slides along the surface of the third runner 31 under the push of the second hydraulic rod 33, the first spring 35 in the groove is compressed to generate elastic deformation. The annularly arrayed first springs 35 in the groove will form a multi-directional buffer structure. When the second hydraulic rod 33 applies a thrust again, the first spring 35 will cause the petal-shaped block 36 to generate an asymmetric deformation, thereby forming a composite oscillation waveform. The connecting piece 37 transmits the oscillation force generated by the deformation to the upper support assembly 4; Four U-shaped blocks 51 are annularly distributed around the bottom plate 1. When the equipment runs and generates shock impacts, the U-shaped springs 52 absorb the impact forces in the vertical and horizontal directions through their own bending deformations, and at the same time achieve energy dispersion through the multi-directional degrees of freedom of the hinge points. When the C-shaped block 53 bears the impact transmitted by the spring, the internal metal rod 54 thereof forms a sliding fit with the trapezoidal hole 43 of the support assembly 4, converting the linear impact into a rotational motion, effectively reducing the stress concentration of the equipment structure; The top cover 63 will slowly approach the circular shell 42 as the movable plate 62 moves downward. At this time, the cleaning assembly 7 enters the circular shell 42. After the second motor 71 starts clockwise, it can drive the triangular plate 72 to rotate. The brush head 76 will generate a reaction force in the opposite direction to the clockwise water flow and rotate counterclockwise under the drive of the second motor 71. The block 75 engaged with the edge of the ratchet 73 will prevent the brush head 76 from rotating counterclockwise. The flexible material of the brush head 76 will generate high-frequency and small-amplitude vibrations when contacting the seed surface, peeling off the attached impurities through mechanical friction, and at the same time avoiding damage to the seed coat structure caused by rigid impact. After cleaning, take out the sewage and the cleaned seeds from the circular shell 42 and separate the seeds.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A vegetable seed shock cleaning device, including a bottom plate (1), characterized in that, A transmission component (2) is fixedly installed on the top of the bottom plate (1), and further includes, A linkage support buffer mechanism, which includes an oscillation component (3). The oscillation component (3) is installed on the left side of the transmission component (2). A support component (4) is sleeved on the outer edge of the oscillation component (3). A buffer component (5) is movably hinged inside the support component (4). A lifting component (6) is fixedly installed on the left side of the buffer component (5). A cleaning component (7) is fixedly installed in the middle of the lifting component (6); The oscillation component (3) includes a third runner (31). A plurality of arc-shaped blocks (32) are annularly arranged on the top of the third runner (31). Second hydraulic rods (33) are fixedly connected to the inner sides of the plurality of arc-shaped blocks (32). A fixing ring (34) is sleeved on the outer edge of the fixed ends of the plurality of second hydraulic rods (33). The bottom of the fixing ring (34) is fixedly connected to the top of the third runner (31). The telescopic ends of the plurality of second hydraulic rods (33) are connected to a petal-shaped block (36). A plurality of first springs (35) are elastically connected to the inner side of the petal-shaped block (36).

2. The vegetable seed oscillation cleaning device according to claim 1, characterized in that, The third runner (31) is rotatably installed on the top of the bottom plate (1). A plurality of grooves are annularly formed in the petal-shaped block (36). The plurality of first springs (35) are elastically connected to the grooves of the petal-shaped block (36) in an annular array manner. The other ends of the plurality of first springs (35) are connected to the inner side of the fixing ring (34). A plurality of connecting pieces (37) are fixedly installed on the top of the petal-shaped block (36). The petal-shaped block (36) can slide on the top of the third runner (31) under the push of the plurality of second hydraulic rods (33).

3. The vegetable seed shock cleaning device according to claim 1, wherein The transmission component (2) includes a trapezoidal block (21). The trapezoidal block (21) is fixedly installed on the top of the bottom plate (1). A first motor (22) is fixedly connected to the left side of the trapezoidal block (21). The output shaft of the first motor (22) is connected to a first runner (23). A transmission belt (24) is sleeved on the outer edge of the first runner (23). A second runner (25) is installed on the outer edge of the transmission belt (24). The rotating shaft of the second runner (25) is connected to a first hydraulic rod (26).

4. The vegetable seed shaking and cleaning device according to claim 3, characterized in that, The first runner (23) is rotatably installed on the top of the bottom plate (1). The fixed end of the first hydraulic rod (26) is fixedly connected to the left side of the trapezoidal block (21). The second runner (25) abuts against the outer edge of the transmission belt (24). The left side of the transmission belt (24) is sleeved on the outer edge of the third runner (31). The diameter of the third runner (31) is larger than that of the first runner (23). The diameter of the first runner (23) is larger than that of the second runner (25).

5. The vegetable seed vibration cleaning device according to claim 1, characterized in that, The support component (4) includes a sleeve (41). A circular shell (42) is sleeved inside the sleeve (41). A plurality of trapezoidal holes (43) are formed in the inner ring surface of the sleeve (41).

6. The vegetable seed oscillation cleaning device according to claim 5, characterized in that, The bottom of the circular shell (42) is fixedly connected to the top of a plurality of connecting pieces (37). An annular protrusion is provided on the inner wall of the sleeve (41), and an annular groove is provided on the outer edge of the circular shell (42). The sleeve (41) is movably sleeved in the groove of the circular shell (42) through the annular protrusion.

7. The vegetable seed oscillation cleaning device according to claim 1, characterized in that, The buffer assembly (5) includes four U-shaped blocks (51). The four U-shaped blocks (51) are all fixedly installed on the top of the bottom plate (1). U-shaped springs (52) are movably hinged inside the four U-shaped blocks (51). The other sides of the four U-shaped springs (52) are movably hinged to C-shaped blocks (53). Metal rods (54) are installed vertically through the four C-shaped blocks (53).

8. The vegetable seed vibration cleaning device according to claim 7, characterized in that, The four C-shaped blocks (53) are annularly installed on the outer edge of the third runner (31). The four C-shaped blocks (53) are movably hinged in trapezoidal holes (43) through metal rods (54).

9. The vegetable seed shaking and cleaning device according to claim 1, characterized in that, The lifting assembly (6) includes two track grooves (61). The two track grooves (61) are fixedly installed on the top of the bottom plate (1). Moving plates (62) are installed inside the two track grooves (61). Electric wheels are installed in the contact areas between the two moving plates (62) and the track grooves (61), so that the moving plates (62) can move up and down in the track grooves (61). The inner sides of the two moving plates (62) are fixedly connected to a top cover (63).

10. A vegetable seed shock cleaning device according to claim 9, characterized in that, The cleaning assembly (7) includes a second motor (71). The second motor (71) is fixedly installed on the top of the top cover (63). A triangular plate (72) is installed on the output shaft of the second motor (71). A bent rod (74) is connected to the outside of the triangular plate (72). A dial block (75) is hinged to the bottom end of the bent rod (74). A torsion spring is installed at the hinge of the dial block (75) and the bent rod (74). Three ratchets (73) are movably hinged to the bottom of the triangular plate (72). The outer edges of the three ratchets (73) are all engaged with the dial block (75). The bottoms of the three ratchets (73) are fixedly connected to a brush head (76).

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