Auxiliary device for loading and transporting coal

Abstract

The utility model provides a coal loading and transporting auxiliary device, which comprises a movable seat, a fixed plate, a movable base, a fixed plate, a movable base, a fixed plate, a movable base and a fixed plate, and is characterized in that the movable base is movably arranged; the bottom of the movable base is connected with the fixed plate; one end of the rotating frame is rotationally connected with the moving seat, a telescopic rod is connected to the lower portion of the rotating frame, and the telescopic rod is used for supporting the rotating frame; the sliding seat is connected into the rotating frame in a sliding manner; the guide plate is installed on the sliding seat, the guide plate is an arc-shaped plate, a drainage groove is formed in the guide plate, and the guide plate is used for being arranged above a train carriage and making contact with coal particles output by the dumper so that the coal particles can be diffused to different positions in the train carriage. When coal particles make contact with the guide plate, the coal particles falling at the same position are diffused in different directions under the action of the curvature of the guide plate, and the stacking height of coal in a train carriage at the same position is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of coal loading and transportation, in particular to a coal loading and transportation auxiliary device. Background Art

[0002] During the transportation of coal particles, it is necessary to use dump trucks to transport the coal particles to the vicinity of the train carriage of the coal transport train, and then control the dump truck carriage to open and lift it, and then dump the coal particles in the dump truck bucket into the train carriage. However, in this process, the position of the dump truck relative to the train carriage remains unchanged, and the coal particles in the train carriage will continue to accumulate in one position, eventually resulting in the accumulation height of the coal particles being too high. Human intervention is required to lower the height of the coal pile in the train carriage to ensure the normal start-up and transportation of the train, but human participation poses serious safety hazards. Utility Model Content

[0003] The utility model provides a coal loading and transportation auxiliary device to solve the problem in the prior art that when a dump truck loads coal particles into a train compartment, coal particles are concentratedly accumulated at a certain position in the train compartment.

[0004] In order to solve the above problems, the utility model provides a coal loading and transportation auxiliary device, including: a movable seat, which is movably arranged, and the bottom of the movable seat is connected to a fixed plate, and the fixed plate is used to support the ground; a rotating frame, one end of the rotating frame is rotatably connected to the movable seat, and a telescopic rod is connected under the rotating frame, and the telescopic rod is used to support the rotating frame; a sliding seat, and the sliding seat is slidably connected in the rotating frame; a guide plate, which is installed on the sliding seat, the guide plate is an arc-shaped plate and has a drainage groove on it, and the guide plate is used to be arranged above the train car and contact the coal particles output by the dump truck, so that the coal particles are diffused to different positions in the train car.

[0005] Furthermore, the rotating frame includes two rotating plates and a connecting plate, the two rotating plates are arranged in parallel and symmetrically, the two ends of the connecting plate are respectively connected to the ends of the two rotating plates, the connecting plate and the two rotating plates are combined to form a frame shape, one end of the rotating plate is rotatably connected to the movable seat, and the sliding seat is slidably connected between the two rotating plates.

[0006] Furthermore, the rotating frame also includes a rotating rod, which passes through the two rotating plates on one side close to the movable seat, and both ends of the rotating rod are rotatably connected to the movable seat. The coal loading and transportation auxiliary device also includes a rotating drive, which drives the rotating rod to rotate.

[0007] Furthermore, a rotating seat and a connecting seat are connected to the rotating rod, and a rotating seat and a connecting seat are respectively provided on the inner and outer sides of each rotating plate. The rotating seat and the connecting seat are fixedly connected to the rotating plate through a positioning rod.

[0008] Furthermore, the outer periphery of the rotating seat and the connecting seat are both connected to two connecting ears, each connecting ear is connected to one of the positioning rods, the two connecting ears on the rotating seat are symmetrically arranged, and the two connecting ears on the connecting seat are symmetrically arranged.

[0009] Furthermore, both ends of the inner side of the rotating plate are connected to rotating wheels, and a transmission chain is connected to the rotating wheels. The coal loading and transportation auxiliary device also includes a transmission driver fixed to the rotating plate, and the transmission driver drives the rotating wheel close to the side of the moving seat to rotate. The two sides of the sliding seat are respectively fixedly connected to the transmission chains on both sides thereof.

[0010] Furthermore, two fixing rods are connected to the inner side of the rotating plate, the two fixing rods are parallel and spaced apart, the transmission chain is located between the two fixing rods, and the sliding seat is slidably connected to the fixing rods.

[0011] Furthermore, a plurality of mounting blocks are spaced apart on one side of the sliding seat facing the corresponding rotating plate, and the mounting blocks are slidably connected to the fixing rod.

[0012] Furthermore, a sliding groove is formed on one side of the mounting block facing the rotating plate, and fixed columns are connected to opposite sides of the sliding groove. The fixed rod is slidably connected to the sliding groove, and the fixed rod is located between the two fixed columns.

[0013] Furthermore, two moving wheels are connected to the bottom of the moving base, and there are multiple fixed disks, and the multiple fixed disks are located between the two moving wheels.

[0014] The present embodiment provides a coal loading and transportation auxiliary device, which is provided with a movable seat, a rotating frame, a sliding seat, and a guide plate. The movable seat is provided to realize the position change of the entire device in the working environment; when in use, the lower part of the movable seat and the rotating frame is located outside the train car, the rotating frame is tilted, and the guide plate is extended into the upper part of the train car through the sliding seat, and the guide plate is located below the position where the dump truck outputs the coal particles. The guide plate contacts the falling coal particles. For coal particles falling at the same position, when the coal particles contact the guide plate, the downward force of the coal particles is decomposed into different directions under the action of the guide plate's curvature, thereby realizing the coal particles falling at the same position in different directions. The diffusion effect can minimize the height of the coal pile at the same position in the train car; the rotating frame can be used to adjust the distance between the guide plate and the train car and the dump truck; the sliding seat can be used to adjust the vertical position and the horizontal position at the same time, ensuring that it can be applied to dump trucks and train cars of different sizes. At the same time, since the position and height of each dump truck relative to the train car when unloading coal are uncertain, the rotating frame and sliding seat can be used to adapt to the positional relationship between various dump trucks and train cars, solving the problem of excessive stacking height when the dump truck loads coal particles into the train car in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 This is a schematic diagram of the structure of the coal loading and transportation auxiliary device provided by the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the guide plate in the coal loading and transportation auxiliary device;

[0018] Figure 3 This is another structural schematic diagram of the guide plate in the coal loading and transportation auxiliary device.

[0019] The above drawings include the following reference numerals:

[0020] 1. Mobile seat;

[0021] 2. Fixed plate;

[0022] 3. Rotate the plate;

[0023] 4. Connecting plate;

[0024] 5. Telescopic rod;

[0025] 6. Sliding seat;

[0026] 7. Guide plate;

[0027] 8. Drainage trough;

[0028] 9. Rotating seat;

[0029] 10. Connecting seat;

[0030] 11. Connecting ears;

[0031] 12. Positioning rod;

[0032] 13. Rotating wheel;

[0033] 14. Transmission chain;

[0034] 15. Transmission driver;

[0035] 16. Fixed rod;

[0036] 17. Install the block;

[0037] 18. Sliding groove;

[0038] 19. Fixed column;

[0039] 20. Moving wheel;

[0040] 21. Turn the rod. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] like Figures 1 to 3 As shown, an embodiment of the present invention provides a coal loading and transportation auxiliary device, including: a movable seat 1, which is movably arranged, and the bottom of the movable seat 1 is connected to a fixed plate 2, and the fixed plate 2 is used to be supported on the ground; a rotating frame, one end of the rotating frame is rotatably connected to the movable seat 1, and a telescopic rod 5 is connected under the rotating frame, and the telescopic rod 5 is used to support the rotating frame; a sliding seat 6, and the sliding seat 6 is slidably connected in the rotating frame; a guide plate 7, the guide plate 7 is installed on the sliding seat 6, the guide plate 7 is an arc-shaped plate and a drainage groove 8 is opened on it, and the guide plate 7 is used to be arranged above the train car and contact the coal particles output by the dump truck, so that the coal particles are diffused to different positions in the train car.

[0043] The coal loading and transportation auxiliary device is provided with a moving seat 1, a rotating frame, a sliding seat 6, and a guide plate 7. The moving seat 1 is provided to realize the position change of the entire device in the working environment; when in use, the lower parts of the moving seat 1 and the rotating frame are located outside the train car, the rotating frame is tilted, and the guide plate 7 is extended into the top of the train car through the sliding seat 6, and the guide plate 7 is located below the position where the dump truck outputs the coal particles. The guide plate 7 contacts the falling coal particles. For coal particles falling at the same position, when the coal particles contact the guide plate 7, the curvature of the guide plate 7 causes the downward force of the coal particles to be decomposed into different directions, thereby achieving the effect of diffusing the coal particles falling at the same position in different directions. The height of the coal pile in the train car is reduced as much as possible; the rotating frame is set, the distance between the guide plate 7 and the train car and the dump truck can be adjusted, specifically the vertical position can be adjusted; the sliding seat 6 is set, the horizontal position can be adjusted at the same time as the vertical position adjustment, ensuring that it can be applied to dump trucks and train cars of different sizes. At the same time, since the position and height of each dump truck relative to the train car when unloading coal are uncertain, the rotating frame and sliding seat 6 can adapt to the positional relationship between various dump trucks and train cars, solving the problem of excessive stacking height when the dump truck loads coal particles into the train car in the prior art.

[0044] Specifically, falling coal particles impact the device. Connecting a fixed plate 2 beneath the movable base 1 stabilizes the contact between the entire device and the ground. A telescopic rod 5 provides support between the rotating frame and the ground, further enhancing the stability of the entire device. The telescopic rod 5 can be constructed using a hydraulic cylinder, for example. The upper end of the telescopic rod 5 is hinged to the rotating frame, and the position of the lower end of the telescopic rod 5 on the ground can be adjusted as needed. A drainage trough 8 guides coal particles above the guide plate 7 to the sides, causing them to diffuse and thus reduce the height of the coal accumulation within the train car.

[0045] Specifically, if Figure 2 As shown, by controlling the angle and height of the rotating frame and the sliding seat 6, the drainage trough 8 is aligned with the falling position of the coal particles in the dump truck, so that the coal particles spread to both sides over a greater distance after contacting the drainage trough 8. Figure 3 As shown, in Figure 3 In the viewing angle, both sides thereof are bent downwards, and no matter what angle or height the rotating frame and the sliding seat 6 are at, the coal particles can be diffused to the outside under the action of the guide plate 7 .

[0046] The rotating frame includes two rotating plates 3 and a connecting plate 4. The two rotating plates 3 are arranged parallel and symmetrically. The ends of the connecting plate 4 are respectively connected to the ends of the two rotating plates 3. The connecting plate 4 and the two rotating plates 3 together form a frame. One end of the rotating plate 3 is rotatably connected to the movable base 1, and the sliding base 6 is slidably connected between the two rotating plates 3. The connecting plate 4 and the two rotating plates 3 form a frame, which can reduce the mass of the portion of the rotating frame that extends beyond the movable base 1, thereby ensuring the stability of the entire device.

[0047] Furthermore, the rotating frame also includes a rotating rod 21, which passes through the two rotating plates 3 close to the side of the moving seat 1. Both ends of the rotating rod 21 are rotatably connected to the moving seat 1. The coal loading and transportation auxiliary device also includes a rotating drive, which drives the rotating rod 21 to rotate.

[0048] The two rotating plates 3 are rotatably connected to the moving base 1 through the rotating rod 21. The rotation of the rotating rod 21 is realized by the provided rotating driver, thereby realizing the change of the angle of the rotating plate 3 relative to the ground, thereby driving the rotation of the sliding base 6 and the guide plate 7.

[0049] like Figure 1 As shown, a rotating seat 9 and a connecting seat 10 are connected to the rotating rod 21, and a rotating seat 9 and a connecting seat 10 are respectively provided on the inner and outer sides of each rotating plate 3. The rotating seat 9 and the connecting seat 10 are fixedly connected to the rotating plate 3 through a positioning rod 12.

[0050] Specifically, the center lines of the two positioning rods 12 on the rotating seat 9 are parallel, and the plane where the two center lines are located is the first plane. The center lines of the two positioning rods 12 on the connecting seat 10 are parallel, and the plane where the two center lines are located is the second plane. The first plane is perpendicular to the second plane. Through the cross-positioning method, the connection relationship between the rotating rod 21 and the rotating plate 3 can be strengthened to ensure the stability of the connection, thereby ensuring the normal progress of the rotation work.

[0051] Among them, the outer periphery of the rotating seat 9 and the connecting seat 10 are connected to two connecting ears 11, each connecting ear 11 is connected to a positioning rod 12, the two connecting ears 11 on the rotating seat 9 are symmetrically arranged, and the two connecting ears 11 on the connecting seat 10 are symmetrically arranged.

[0052] Furthermore, rotating wheels 13 are connected to both ends of the inner side of the rotating plate 3, and a transmission chain 14 is connected to the rotating wheels 13. The coal loading and transportation auxiliary device also includes a transmission driver 15 fixed to the rotating plate 3. The transmission driver 15 drives the rotating wheels 13 on the side near the movable seat 1 to rotate. The two sides of the sliding seat 6 are respectively fixedly connected to the transmission chains 14 on both sides. The rotating wheels 13 and transmission chain 14 are used to achieve reciprocating sliding operation of the sliding seat 6 along the length of the rotating plate 3.

[0053] Furthermore, two fixed rods 16 are connected to the inner side of the rotating plate 3. The two fixed rods 16 are arranged parallel and spaced apart. The transmission chain 14 is located between the two fixed rods 16, and the sliding seat 6 is slidably connected to the fixed rods 16. Compared with the method of connecting the sliding seat 6 only to the transmission chain 14, the fixed rods 16 are used to limit the upper and lower positions of the sides of the sliding seat 6, which can increase the stability of the sliding seat 6 during reciprocating motion and prevent it from collapsing or falling.

[0054] Furthermore, a plurality of mounting blocks 17 are spaced apart on one side of the sliding seat 6 facing the corresponding rotating plate 3 , and the mounting blocks 17 are slidably connected to the fixing rod 16 .

[0055] A sliding slot 18 is defined on the side of the mounting block 17 facing the rotating plate 3. Fixed posts 19 are connected to opposite sides of the sliding slot 18. The fixed rod 16 is slidably connected to the sliding slot 18, with the fixed rod 16 positioned between the two fixed posts 19. The fixed rod 16 is connected to the rotating plate 3 via a fixing bar. The sliding slot 18, the two fixed posts 19, and the fixing bar surround the fixed rod 16 360 degrees, and the fixed posts 19 slide in the direction in which the fixed rod 16 extends.

[0056] The bottom of the movable base 1 is connected to two movable wheels 20 to facilitate the movement of the movable base 1. There are multiple fixed plates 2, and the multiple fixed plates 2 are located between the two movable wheels 20 to improve the stability of the support.

[0057] Coal loading operations often involve complex and varied terrain, such as coal piles and railway loading and unloading platforms. The combined design of mobile wheels and fixed plates enables the coal loading and transport auxiliary device to easily cope with various ground conditions. The mobile wheels ensure flexible movement of the equipment, while the multiple fixed plates provide the necessary support, maintaining the equipment's stability even on tilted or uneven surfaces, avoiding operational interruptions or safety accidents caused by poor ground conditions. This device is particularly suitable for coal loading operations at large coal transportation bases, significantly improving the flexibility and safety of coal loading and providing a solid foundation for the efficient operation of the coal transportation industry.

[0058] The technical solution of the present application has at least the following advantages and beneficial effects: by providing a guide plate, the guide plate contacts the falling coal particles. For coal particles falling from the same position, when the coal particles contact the guide plate and are acted upon by its curvature, the downward force acting on the coal particles is decomposed into different directions, thereby achieving the effect of diffusing the coal particles falling from the same position in different directions, thereby minimizing the height of the coal pile in the train car as much as possible; by providing a rotating frame and a sliding seat, the vertical position can be adjusted while the horizontal position can be adjusted, ensuring that it can be applied to dump trucks and train cars of different sizes, thereby solving the problem of excessive stacking height when dump trucks load coal particles into train cars in the prior art.

[0059] This coal loading and transportation assistance device, designed with a movable base, rotating frame, sliding base, and guide plate, achieves uniform distribution of coal particles within train cars, improving loading efficiency and coal transportation safety. The position and angle of the guide plate can be adjusted using a telescopic rod and rotary actuator to accommodate cars of varying heights and sizes, enhancing the device's versatility and flexibility. The sliding base and transmission actuator allow the guide plate to be movable, further improving the uniformity of coal particle distribution, reducing subsequent sorting work and labor costs. Furthermore, the combination of a fixed plate and movable wheels ensures the device's stability and mobility on the ground, making it more adaptable to diverse working environments. Its rational overall design, stable structure, and easy operation make it highly practical and promising for widespread adoption. In practical application, this device can significantly improve the speed and quality of coal loading, reduce safety hazards caused by uneven coal distribution, and is particularly suitable for coal loading operations at large coal transportation bases, mines, and ports, significantly enhancing the efficiency and economic benefits of coal transportation. Furthermore, the device is relatively simple to maintain and operate, reducing the need for specialized technical personnel.

[0060] The above description is merely an optional embodiment of the present invention and is not intended to limit the present invention. Persons skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of this solution. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the techniques, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, rather than limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0063] In the description of this scheme, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of this scheme; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this solution.

Claims

1. A coal loading and transportation auxiliary device, characterized in that: include: A movable seat (1) is movably arranged, wherein the bottom of the movable seat (1) is connected to a fixed plate (2), and the fixed plate (2) is used for supporting on the ground; A rotating frame, one end of the rotating frame being rotatably connected to the movable seat (1), a telescopic rod (5) being connected below the rotating frame, and the telescopic rod (5) being used to support the rotating frame; A sliding seat (6), wherein the sliding seat (6) is slidably connected in the rotating frame; A guide plate (7) is mounted on the sliding seat (6), the guide plate (7) is an arc-shaped plate and is provided with a drainage groove (8), and the guide plate (7) is used to be arranged above a train carriage and contact the coal particles output by the dump truck, so that the coal particles are diffused to different positions in the train carriage.

2. The coal loading and transportation auxiliary device according to claim 1, characterized in that: The rotating frame comprises two rotating plates (3) and a connecting plate (4), the two rotating plates (3) are arranged in parallel and symmetrically, the two ends of the connecting plate (4) are respectively connected to the ends of the two rotating plates (3), the connecting plate (4) and the two rotating plates (3) are enclosed to form a frame shape, one end of the rotating plate (3) is rotatably connected to the movable seat (1), and the sliding seat (6) is slidably connected between the two rotating plates (3).

3. The coal loading and transportation auxiliary device according to claim 2, characterized in that: The rotating frame further comprises a rotating rod (21), the rotating rod (21) passing through one side of the two rotating plates (3) close to the movable seat (1), both ends of the rotating rod (21) being rotatably connected to the movable seat (1), and the coal loading and transportation auxiliary device further comprises a rotating driver, the rotating driver driving the rotating rod (21) to rotate.

4. The coal loading and transportation auxiliary device according to claim 3, characterized in that: The rotating rod (21) is connected to a rotating seat (9) and a connecting seat (10), and each rotating plate (3) is provided with a rotating seat (9) and a connecting seat (10) on both the inner and outer sides, respectively. The rotating seat (9) and the connecting seat (10) are fixedly connected to the rotating plate (3) via a positioning rod (12).

5. The coal loading and transportation auxiliary device according to claim 4, characterized in that: The outer peripheries of the rotating seat (9) and the connecting seat (10) are both connected with two connecting ears (11), each connecting ear (11) is connected to one positioning rod (12), the two connecting ears (11) on the rotating seat (9) are symmetrically arranged, and the two connecting ears (11) on the connecting seat (10) are symmetrically arranged.

6. The coal loading and transportation auxiliary device according to claim 3, characterized in that: Both ends of the inner side of the rotating plate (3) are connected to rotating wheels (13), and a transmission chain (14) is connected to the rotating wheel (13). The coal loading and transportation auxiliary device also includes a transmission driver (15) fixed to the rotating plate (3), and the transmission driver (15) drives the rotating wheel (13) close to the side of the moving seat (1) to rotate. The two sides of the sliding seat (6) are respectively fixedly connected to the transmission chains (14) on both sides thereof.

7. The coal loading and transportation auxiliary device according to claim 6, characterized in that: Two fixed rods (16) are connected to the inner side of the rotating plate (3), the two fixed rods (16) are parallel and spaced apart, the transmission chain (14) is located between the two fixed rods (16), and the sliding seat (6) is slidably connected to the fixed rods (16).

8. The coal loading and transportation auxiliary device according to claim 7, characterized in that: A plurality of mounting blocks (17) are spaced apart and arranged on one side of the sliding seat (6) facing the corresponding rotating plate (3), and the mounting blocks (17) are slidably connected to the fixing rod (16).

9. The coal loading and transportation auxiliary device according to claim 8, characterized in that: The mounting block (17) is provided with a sliding groove (18) on one side facing the rotating plate (3), and fixed columns (19) are connected to opposite sides of the sliding groove (18). The fixed rod (16) and the sliding groove (18) are slidably connected, and the fixed rod (16) is located between the two fixed columns (19).

10. The coal loading and transportation auxiliary device according to claim 1, characterized in that: The bottom of the movable seat (1) is connected to two movable wheels (20), and there are multiple fixed discs (2), and the multiple fixed discs (2) are located between the two movable wheels (20).

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