A mashing cleaning device

Abstract

The utility model provides a kind of stirring and cleaning device, including rotary crushing mechanism, rotary crushing mechanism includes the bracket of hollow, the hollow baffle ring, outer circle stirring piece and inner circle stirring piece.Baffle ring is located in the top of bracket and is connected with bracket;Outer circle stirring piece includes multiple outer circle stirring knives, outer circle hollow position is equipped between adjacent outer circle stirring knives, outer circle stirring piece is located in baffle ring and is supported by bracket;Inner circle stirring piece includes multiple inner circle stirring knives, inner circle hollow position is equipped between adjacent inner circle stirring knives, inner circle stirring piece is located in baffle ring and is supported by bracket;Outer circle stirring piece is sleeved in the outside of inner circle stirring piece, outer circle stirring piece is rotatably connected with inner circle stirring piece, the rotating direction of outer circle stirring piece and inner circle stirring piece is opposite, outer circle stirring knife and inner circle stirring knife are located in the top, outer circle stirring knife and inner circle stirring knife have gap.The utility model ensures the continuity of raw material grinding production, also improves the grinding efficiency of ball mill.

Description

Technical Field

[0001] This utility model relates to the technical field of cleaning stones and large clumps in mud, and more specifically, to a crushing and cleaning device. Background Technology

[0002] Building ceramic enterprises need clay and sand in the production of ceramic tiles. Both clay and sand are mined from raw ore and contain a large amount of stones and impurities. While stones in sand are easy to separate, stones in clay are difficult to remove. Furthermore, clay is highly viscous and contains a certain amount of moisture, making it prone to clumping into large, hard lumps during transport. This can cause the clay to jam or block the drum feeder, preventing raw materials from entering the feeder and thus affecting production. Moreover, large, hard solid lumps in the clay that jam the drum feeder are extremely difficult to remove, sometimes requiring cutting the drum feeder, removing the stones, and then re-welding it. This severely impacts production continuity, is labor-intensive, costly, and detrimental to production organization. Small stones in the clay entering the ball mill can affect the grinding efficiency and damage the grinding balls, hindering improvements in grinding efficiency and reductions in power consumption. Utility Model Content

[0003] The purpose of this invention is to provide a crushing and cleaning device to solve the technical problems in the prior art of cleaning stones and large clumps of mud that are difficult to clean and easily jam the feeder.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a crushing and cleaning device, including a rotary crushing mechanism, wherein the rotary crushing mechanism includes:

[0006] A hollow bracket;

[0007] A hollow retaining ring is provided above the bracket and connected to the bracket;

[0008] An outer circular stirring component, comprising multiple outer circular stirring blades, with outer circular hollow positions provided between adjacent outer circular stirring blades, the outer circular stirring component being disposed within the retaining ring and supported by the bracket;

[0009] An inner circular stirring component, comprising multiple inner circular stirring blades, with inner circular hollow positions provided between adjacent inner circular stirring blades, the inner circular stirring component being disposed within the retaining ring and supported by the bracket;

[0010] The outer circular stirring element is sleeved outside the inner circular stirring element, and the outer circular stirring element is rotatably connected to the inner circular stirring element. The outer circular stirring element and the inner circular stirring element rotate in opposite directions. The outer circular stirring blade is located above the inner circular stirring blade, and there is a gap between the outer circular stirring blade and the inner circular stirring blade.

[0011] According to the above-described agitation and cleaning device, the outer circular stirring component includes a first annular connecting plate disposed at the bottom end of the outer circular stirring blade, and the inner wall of the first connecting plate is provided with a first tooth.

[0012] The inner circular stirring component includes a second annular connecting plate disposed at the bottom end of the inner circular stirring blade. The outer wall of the second connecting plate is provided with a second tooth, and the first tooth and the second tooth are meshed by at least one first gear.

[0013] According to the above-described crushing and cleaning device, the rotary crushing mechanism further includes a driving mechanism, which includes a first motor, a third gear, and a fourth gear. The output shaft of the first motor is connected to the third gear, and the third gear meshes with the fourth gear.

[0014] The outer wall of the first connecting plate is provided with a fifth tooth, and the fourth gear meshes with the fifth tooth.

[0015] According to the above-described agitation and cleaning device, the outer circular stirring component further includes a ring-shaped third connecting plate disposed at the top of the outer circular stirring blade, and the inner wall of the third connecting plate is provided with a third tooth.

[0016] The inner circular stirring component also includes a fourth annular connecting plate disposed at the top of the inner circular stirring blade. The outer wall of the fourth connecting plate is provided with a fourth tooth, and the third tooth and the fourth tooth are meshed by at least one second gear.

[0017] According to the above-described agitation and cleaning device, the third connecting plate is located above the first connecting plate, the top end of the outer circular agitator is connected to the third connecting plate, the bottom end is connected to the first connecting plate, and the outer circular agitator is inclined.

[0018] The fourth connecting plate is located above the second connecting plate. The top end of the inner circular stirring blade is connected to the fourth connecting plate, and the bottom end is connected to the second connecting plate. The inner circular stirring blade is inclined.

[0019] According to the above-described agitation and cleaning device, the outer circular hollow portion is rectangular or trapezoidal; the inner circular hollow portion is rectangular or trapezoidal.

[0020] According to the above-described agitation and cleaning device, the baffle ring is provided with a collecting baffle and a discharge port. The collecting baffle is located at the discharge port and extends inward from the discharge port. The collecting baffle is located above the outer circular agitator and has a gap with the outer circular agitator.

[0021] According to the above-described agitation and cleaning device, the top of the bracket is provided with a groove, the bottom of the outer circular agitator and the inner circular agitator are located in the groove, and the groove is provided with multiple planar bearings.

[0022] According to the above-described pulverizing and cleaning device, the pulverizing and cleaning device further includes a transfer mechanism, which is located below the bracket.

[0023] According to the above-described shredding and cleaning device, the transfer mechanism includes a transmission belt, a first transmission wheel and a second transmission wheel, and a second motor. The transmission belt is wound around the first transmission wheel and the second transmission wheel, and the second motor is connected to the first transmission wheel or the second transmission wheel.

[0024] The beneficial effects of the agitation and cleaning device provided by this utility model are at least as follows:

[0025] The crushing and cleaning device provided by this utility model can clean stones from mud and sand, and also crush large clumps of mud, solving the problems of stones and mud clogging the drum feeder, thus ensuring the continuity of raw material grinding production. It also improves the grinding efficiency of the ball mill, reduces maintenance costs and labor intensity for employees, and reduces the wear and tear of grinding balls in the ball mill, which is conducive to further reducing the company's production costs. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A three-dimensional structural diagram of the crushing and cleaning device provided by this utility model;

[0028] Figure 2 A three-dimensional structural diagram of the rotary crushing mechanism provided by this utility model;

[0029] Figure 3 Exploded view of the rotary crushing mechanism provided by this utility model Figure 1 ;

[0030] Figure 4 Exploded view of the rotary crushing mechanism provided by this utility model Figure 2 ;

[0031] Figure 5 A schematic diagram of the structure of the outer circular stirring component and the driving mechanism provided by this utility model;

[0032] Figure 6 This is a schematic diagram of the structure of the inner circular stirring component provided by this utility model;

[0033] Figure 7 A schematic diagram of the transfer mechanism provided by this utility model.

[0034] The following are the labeling elements in the figure:

[0035] 1000. Crushing and cleaning device; 100. Rotary crushing mechanism; 10. Bracket; 11. Groove position; 12. Surface bearing; 20. Retaining ring; 21. Collecting baffle; 22. Discharge port; 30. Outer circular stirring component; 31. Outer circular stirring blade; 32. Outer circular hollow position; 33. First connecting plate; 34. First tooth; 35. Third connecting plate; 36. Third tooth; 37. Fifth tooth; 38. Top cover; 39. Second gear; 40. 41. Inner circular stirring component; 42. Inner circular stirring blade; 43. Second connecting plate; 44. Second toothed part; 45. Fourth connecting plate; 46. Fourth toothed part; 47. First gear; 50. Drive mechanism; 51. First motor; 52. Third gear; 53. Fourth gear; 200. Transfer mechanism; 210. Transmission belt; 220. First transmission wheel; 230. Second transmission wheel; 240. Second motor; 300. Frame. Detailed Implementation

[0036] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0037] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly or indirectly located on that other component. When a component is referred to as "connected to" another component, it can be directly or indirectly connected to that other component. The terms "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the accompanying drawings, and are for ease of description only, and should not be construed as limiting the technical solution. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality of" means two or more, unless otherwise explicitly defined.

[0038] Please see Figure 1 This embodiment provides a crushing and cleaning device 1000, including a frame 300, a rotary crushing mechanism 100, and a transfer mechanism 200. The transfer mechanism 200 is mounted on the frame 300, and the rotary crushing mechanism 100 is positioned above the transfer mechanism 200. The rotary crushing mechanism 100 is used to crush large clumps of mud and clean stones from the mud and sand. The transfer mechanism 200 is used to receive and transfer the crushed mud and send it to the next process step.

[0039] Please refer to Figures 2 to 4 The rotary crushing mechanism 100 includes a hollow bracket 10, a hollow retaining ring 20, an outer circular agitator 30, and an inner circular agitator 40. The hollow bracket 10 is connected to an external support frame and is used to support the rotary crushing mechanism 100. The retaining ring 20 is located above the bracket 10 and connected to the bracket 10, and is used to block mud and sand materials poured into the retaining ring 20.

[0040] Please see Figure 5 The outer circular stirring component 30 includes multiple outer circular stirring blades 31, with outer circular hollow positions 32 provided between adjacent outer circular stirring blades 31. The outer circular stirring component 30 is disposed within the retaining ring 20 and supported by the bracket 10. Please refer to... Figure 6 The inner circular stirring component 40 includes multiple inner circular stirring blades 41, with inner circular hollow positions 42 provided between adjacent inner circular stirring blades 41. The inner circular stirring component 40 is disposed within the retaining ring 20 and supported by the bracket 10. Please refer to... Figure 3 and Figure 4 The outer circular stirring element 30 is sleeved outside the inner circular stirring element 40. The outer circular stirring element 30 is rotatably connected to the inner circular stirring element 40, and the rotation directions of the outer circular stirring element 30 and the inner circular stirring element 40 are opposite. The outer circular stirring blade 31 is located above the inner circular stirring blade 41, and there is a gap between the outer circular stirring blade 31 and the inner circular stirring blade 41.

[0041] In one embodiment, the outer circular stirring blades 31 are arranged in a ring matrix, and correspondingly, the outer circular hollow positions 32 are arranged in a ring matrix. The inner circular stirring blades 41 are arranged in a ring matrix, and correspondingly, the inner circular hollow positions 42 are arranged in a ring matrix.

[0042] In one embodiment, the outer circular cutout 32 is rectangular or trapezoidal, and the inner circular cutout 42 is rectangular or trapezoidal. It should be understood that the shapes of the outer circular cutout 32 and the inner circular cutout 42 are not limited to the above-described cases, and may also be other cases, which are not limited here.

[0043] In one embodiment, the outer circular stirring blade 31 is trapezoidal, and the inner circular stirring blade 41 is trapezoidal. It should be understood that the shapes of the outer circular stirring blade 31 and the inner circular stirring blade 41 are not limited to the above-described cases, and may also be other cases, which are not limited here.

[0044] In one embodiment, see Figure 5 The rotary crushing mechanism 100 further includes a drive mechanism 50, which includes a first motor 51, a third gear 52, and a fourth gear 53. The output shaft of the first motor 51 is connected to the third gear 52, and the third gear 52 meshes with the fourth gear 53. The outer circular stirring component 30 includes an annular first connecting plate 33 located at the bottom end of the outer circular stirring blade 31. The outer wall of the first connecting plate 33 is provided with a fifth tooth 37, and the fourth gear 53 meshes with the fifth tooth 37.

[0045] The first motor 51 drives the third gear 52 to rotate, the third gear 52 is linked to the fourth gear 53 to rotate, the fourth gear 53 is linked to the fifth tooth 37, thereby realizing the linkage of the first connecting plate 33 to rotate the entire external stirring component, and the linkage structure is simple.

[0046] In one embodiment, see Figure 5 and Figure 6 The outer circular stirring component 30 includes an annular first connecting plate 33 disposed at the bottom end of the outer circular stirring blade 31, and the inner wall of the first connecting plate 33 is provided with a first tooth 34; the inner circular stirring component 40 includes an annular second connecting plate 43 disposed at the bottom end of the inner circular stirring blade 41, and the outer wall of the second connecting plate 43 is provided with a second tooth 44, and the first tooth 34 and the second tooth 44 are meshed by at least one first gear 47.

[0047] By setting the first gear 47 to mesh with the first tooth 34 and the second tooth 44, the rotation directions of the first connecting plate 33 and the second connecting plate 43 are opposite, that is, the rotation directions of the outer circular stirring member 30 and the inner circular stirring member 40 are opposite, thereby realizing the crushing of large pieces of mud that fall between the outer circular stirring blade and the inner circular stirring blade.

[0048] Optionally, the number of first gears 47 is 2 to 15. Optionally, the number of first gears 47 is 8, and the 8 first gears 47 are evenly arranged between the first tooth portion 34 and the second tooth portion 44. It should be understood that the number of first gears 47 is not limited to the above-mentioned number, and may be other numbers, which are not limited here.

[0049] In one embodiment, see Figure 5 and Figure 6 The outer circular stirring component 30 further includes an annular third connecting plate 35 disposed at the top end of the outer circular stirring blade 31, the inner wall of the third connecting plate 35 being provided with a third tooth 36; the inner circular stirring component 40 further includes an annular fourth connecting plate 45 disposed at the top end of the inner circular stirring blade 41, the outer wall of the fourth connecting plate 45 being provided with a fourth tooth 46, the third tooth 36 and the fourth tooth 46 meshing through at least one second gear 39 (see reference). Figure 4 ).

[0050] By setting the second gear 39 to mesh with the third tooth 36 and the fourth tooth 46, the rotation directions of the third connecting plate 35 and the fourth connecting plate 45 are opposite, that is, the rotation directions of the outer circular stirring member 30 and the inner circular stirring member 40 are opposite. Furthermore, the combination of the second gear 39, the third gear 52, and the combination of the third gear 52 with the first gear 47 and the second gear 39 makes the structure of the relative rotation of the outer circular stirring member 30 and the inner circular stirring member 40 more stable.

[0051] Optionally, the number of second gears 39 is 2 to 10. Optionally, the number of second gears 39 is 6. The second gears 39 are evenly disposed between the third tooth portion 36 and the fourth tooth portion 46. It should be understood that the number of second gears 39 is not limited to the above-mentioned number, and may be other numbers, which are not limited here.

[0052] Optionally, the outer circular stirring component 30 also includes a top cover 38, which is disposed on the third connecting plate 35. Optionally, the second gear 39 is disposed on the top cover 38. The top cover 38 prevents mud and sand from falling directly from the hollow fourth connecting plate 45 onto the transfer mechanism 200.

[0053] In one embodiment, see Figure 5The third connecting plate 35 is located above the first connecting plate 33. The top end of the outer circular stirring blade 31 is connected to the third connecting plate 35, and the bottom end is connected to the first connecting plate 33. The outer circular stirring blade 31 is inclined, and the inclination angle of the outer circular stirring blade 31 is 10° to 45°. Optionally, the inclination angle of the outer circular stirring blade 31 is 30°. The inclined outer circular stirring blade 31 can avoid excessive accumulation of mud and sand.

[0054] Please see Figure 6 The fourth connecting plate 45 is located above the second connecting plate 43. The top end of the inner circular stirring blade 41 is connected to the fourth connecting plate 45, and the bottom end is connected to the second connecting plate 43. The inner circular stirring blade 41 is inclined, with an inclination angle of 10° to 45°. Optionally, the inclination angle of the inner circular stirring blade 41 is 30°. The inclined inner circular stirring blade 41 can avoid excessive accumulation of mud and sand.

[0055] In one embodiment, see Figure 3 The baffle ring 20 is provided with a collecting baffle 21 and a discharge port 22. The collecting baffle 21 is located at the discharge port 22 and extends inward from the discharge port 22. The collecting baffle 21 is located above the outer circular stirring blade 31 and has a gap with the outer circular stirring blade 31 to facilitate the passage of small pieces of mud.

[0056] Large, unmixable mud or stones remain on the outer circular mixer. When they encounter the collecting baffle 21 during rotation, the collecting baffle 21 and the outer circular mixer 30 rotate at a certain opposite angle. Under the action of centrifugal force, they will slide along the collecting baffle 21 to the discharge port 22, be collected, and then transported away.

[0057] In one embodiment, see Figure 3 The bracket 10 has a groove 11 at its top, and the bottoms of the outer circular stirring member 30 and the inner circular stirring member 40 are located in the groove 11. The groove 11 is provided with multiple planar bearings 12. The planar bearings 12 are used to support the outer circular stirring member 30 and the inner circular stirring member 40.

[0058] In one embodiment, see Figure 7The transfer mechanism 200 is located below the bracket 10. The transfer mechanism 200 is used to receive and transfer the crushed mud material and send it to the next process step. The transfer mechanism 200 includes a transmission belt 210, a first transmission wheel 220 and a second transmission wheel 230, and a second motor 240. The transmission belt 210 is wound around the first transmission wheel 220 and the second transmission wheel 230, and the second motor 240 is connected to either the first transmission wheel 220 or the second transmission wheel 230. Since the first transmission wheel 220 and the second transmission wheel 230 are connected by the transmission belt 210, when the first motor 51 rotates in conjunction with the first transmission wheel 220, the transmission belt 210 moves and simultaneously drives the second transmission wheel 230 to rotate, thereby achieving stable operation of the transmission belt 210.

[0059] In summary, the working principle and process of the shredding and cleaning device 1000 provided in this embodiment are as follows:

[0060] The mud or sand to be cleaned is poured into the baffle ring 20 from above. The first motor 51 drives the third tooth 36 to rotate, which in turn drives the fourth tooth 46 meshing with it to rotate. The fourth tooth 46 then drives the fifth tooth 37 meshing with it to rotate. The rotation of the fifth tooth 37 means that the entire outer circular agitator 30 rotates. When the outer circular agitator 30 rotates, the first tooth 34 and the third tooth 36 also rotate simultaneously. The rotation of the first tooth 34 drives the first gear 47 meshing with it to rotate, which in turn drives the second tooth 44 meshing with it to rotate. At the same time, the third tooth 36 drives the second gear 39 meshing with it to rotate, which in turn drives the fourth tooth 46 meshing with it to rotate. The rotation of the second tooth 44 and the fourth tooth 46 means that the entire inner circular agitator rotates, thus achieving the opposite rotation of the outer circular agitator 30 and the inner circular agitator 40.

[0061] Because the outer circular agitator is equipped with outer circular agitator blades, and there are outer circular cutouts 32 between adjacent outer circular agitator blades, and the inner circular agitator is equipped with inner circular agitator blades, and there are inner circular cutouts 42 between adjacent inner circular agitator blades, with the outer circular agitator blades 31 and 41 located above each other and with a gap between them, during the opposite rotation of the outer circular agitator 30 and the inner circular agitator 40, the mud or sand material begins to fall due to its own gravity, falling between the outer and inner circular agitator blades. This allows for the breaking up of large pieces of mud, and the broken mud material falls through the bracket 10 onto the transfer mechanism 200 below the bracket 10 to enter the next process.

[0062] When encountering large pieces of mud or stone that cannot be crushed, these pieces will remain on the outer circular mixing element 30. When they encounter the collecting baffle 21 during rotation, the collecting baffle 21 and the outer circular mixing element 30 rotate at a certain opposite angle. Under the action of centrifugal force, they will slide along the collecting baffle 21 to the discharge port 22, be collected, and then transported away.

[0063] The crushing and cleaning device 1000 provided in this embodiment cleans stones from mud and sand, and also crushes large clumps of mud, solving the problems of stones and mud clogging the drum feeder, thus ensuring the continuity of raw material grinding production. It also improves the grinding efficiency of the ball mill, reduces maintenance costs and labor intensity for employees, and minimizes the loss of grinding balls within the ball mill, further contributing to cost reduction.

[0064] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A grinding and cleaning device, characterized in that, Includes a rotary crushing mechanism, the rotary crushing mechanism comprising: A hollow bracket; A hollow retaining ring is provided above the bracket and connected to the bracket; An outer circular stirring component, comprising multiple outer circular stirring blades, with outer circular hollow positions provided between adjacent outer circular stirring blades, the outer circular stirring component being disposed within the retaining ring and supported by the bracket; An inner circular stirring component, comprising multiple inner circular stirring blades, with inner circular hollow positions provided between adjacent inner circular stirring blades, the inner circular stirring component being disposed within the retaining ring and supported by the bracket; The outer circular stirring element is sleeved outside the inner circular stirring element, and the outer circular stirring element is rotatably connected to the inner circular stirring element. The outer circular stirring element and the inner circular stirring element rotate in opposite directions. The outer circular stirring blade is located above the inner circular stirring blade, and there is a gap between the outer circular stirring blade and the inner circular stirring blade.

2. The agitation and cleaning device according to claim 1, characterized in that, The outer circular stirring component includes a first annular connecting plate disposed at the bottom end of the outer circular stirring blade, and the inner wall of the first connecting plate is provided with a first tooth. The inner circular stirring component includes a second annular connecting plate disposed at the bottom end of the inner circular stirring blade. The outer wall of the second connecting plate is provided with a second tooth, and the first tooth and the second tooth are meshed by at least one first gear.

3. The agitation and cleaning device according to claim 2, characterized in that, The rotary crushing mechanism further includes a drive mechanism, which includes a first motor, a third gear, and a fourth gear. The output shaft of the first motor is connected to the third gear, and the third gear meshes with the fourth gear. The outer wall of the first connecting plate is provided with a fifth tooth, and the fourth gear meshes with the fifth tooth.

4. The agitation and cleaning device according to claim 2, characterized in that, The outer circular stirring component also includes a ring-shaped third connecting plate disposed at the top of the outer circular stirring blade, and the inner wall of the third connecting plate is provided with a third tooth. The inner circular stirring component also includes a fourth annular connecting plate disposed at the top of the inner circular stirring blade. The outer wall of the fourth connecting plate is provided with a fourth tooth, and the third tooth and the fourth tooth are meshed by at least one second gear.

5. The agitation and cleaning device according to claim 4, characterized in that, The third connecting plate is located above the first connecting plate. The top end of the outer circular stirring blade is connected to the third connecting plate, and the bottom end is connected to the first connecting plate. The outer circular stirring blade is inclined. The fourth connecting plate is located above the second connecting plate. The top end of the inner circular agitator is connected to the fourth connecting plate, and the bottom end is connected to the second connecting plate. The inner circular agitator is inclined.

6. The agitation and cleaning device according to claim 1, characterized in that, The outer circular cutout is rectangular or trapezoidal; the inner circular cutout is rectangular or trapezoidal.

7. The agitation and cleaning device according to claim 1, characterized in that, The retaining ring is provided with a collecting baffle and a discharge port. The collecting baffle is located at the discharge port and extends inward from the discharge port. The collecting baffle is located above the outer circular agitator and has a gap with the outer circular agitator.

8. The agitation and cleaning device according to claim 1, characterized in that, The top of the bracket is provided with a groove, and the bottoms of the outer and inner circular stirring components are located within the groove. The groove is provided with multiple planar bearings.

9. The agitation and cleaning device according to claim 1, characterized in that, The shredding and cleaning device also includes a transfer mechanism, which is located below the bracket.

10. The agitation and cleaning device according to claim 9, characterized in that, The transfer mechanism includes a transmission belt, a first transmission wheel and a second transmission wheel, and a second motor. The transmission belt is wound around the first transmission wheel and the second transmission wheel, and the second motor is connected to the first transmission wheel or the second transmission wheel.

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