Agricultural fruit tree sapling planting device

By designing a fruit tree seedling planting device including an outer cylinder and a shaped ring, the soil is excavated by the drilling structure and extruded by the shaped ring to form a cofferdam, the time-consuming problem of artificial cofferdam construction in traditional planting is solved, and the efficiency and automation are improved.

CN120380911AActive Publication Date: 2025-07-29SHANDONG WEIMEI AGROFORESTRY TECHNOLOGY CO LTD

Patent Information

Application Number
CN202510888606.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-30
Publication Date
2025-07-29
Estimated Expiration
2045-06-30

AI Technical Summary

Technical Problem

In the planting of traditional fruit tree seedlings, pit excavation and cofferdam construction require a lot of manpower, which affects the planting efficiency.

Method used

Design an agricultural fruit tree seedling planting device, including an outer cylinder, a shaped ring and a drilling structure, dig the soil through the drilling structure and extrude the shaped ring to form a cofferdam to avoid wasting time when the cofferdam was established separately.

Benefits of technology

Improve work efficiency, reduce the labor intensity of artificially breaking up the soil, and improve the degree of automation.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention relates to the technical field of fruit tree planting, in particular to an agricultural fruit tree sapling planting device which comprises an outer cylinder, a ring and a drilling structure, the ring and the drilling structure are located on the inner side of the outer cylinder, an opening of the outer cylinder faces downwards, and the ring slides in the outer cylinder in the axis direction of the outer cylinder. The annular ring is arranged in the outer cylinder, the annular ring and the inner wall of the outer cylinder form a groove-shaped structure with a downward opening, the groove-shaped structure is in a ring shape surrounding the axis of the outer cylinder, the annular ring is rotationally connected with the drilling structure, and the drilling structure is used for drilling into soil; soil excavated by the drilling structure is gathered and extruded and shaped by means of the shaped ring, so that the cofferdam with a water retaining function can be formed in the excavation process, time waste caused by independent establishment of the cofferdam is avoided, the working efficiency is improved, and by means of the mode, manpower loss caused by manually scattering the soil and establishing the cofferdam can be avoided, and the construction cost is reduced. The automation degree is improved.
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Description

Technical Field

[0001] The present invention relates to the technical field of fruit tree planting, and particularly to an agricultural fruit tree sapling planting device. Background Art

[0002] When planting fruit tree saplings, a pit needs to be dug in the planting area. Then, the sapling with a root soil mass is placed into the pit, and backfilling and watering are carried out. When digging the pit, in order to facilitate water storage during subsequent watering, some of the excavated soil around the pit needs to be scattered and piled up in a ring shape, and then the soil is tamped to form a cofferdam around the sapling.

[0003] In the traditional planting method, the pit can be dug manually or mechanically, while the construction of the cofferdam can only be completed manually. This not only consumes a lot of manpower but also seriously affects the planting efficiency. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides an agricultural fruit tree sapling planting device, and the specific technical solution adopted is as follows: An agricultural fruit tree sapling planting device of the present invention includes an outer cylinder, a ring-shaped structure and a drilling structure located inside the outer cylinder. The outer cylinder has an opening facing downwards. The ring-shaped structure slides along the axis direction of the outer cylinder inside the outer cylinder, and the ring-shaped structure and the inner wall of the outer cylinder form a trough-shaped structure with an opening facing downwards. The shape of the trough-shaped structure is a ring surrounding the axis of the outer cylinder. The ring-shaped structure is rotationally connected to the drilling structure, and the drilling structure is used for drilling into the soil.

[0005] Further, the drilling structure includes a cone, a support column and a spiral plate. The support column is installed at the bottom of the cone, and the spiral plate is arranged around the cone and the support column; Wherein, the shape of the spiral plate is an inverted cone.

[0006] Further, the spiral plate includes a first spiral part located on the support column, a second spiral part located on the cone, and a transition part connecting the first spiral part and the second spiral part. The cross-section of the first spiral part slopes upwards, and the cross-section of the second spiral part slopes downwards.

[0007] Further, a connecting part is arranged between the ring-shaped structure and the drilling structure. The connecting part includes a first buckle groove arranged on the inner circle of the ring-shaped structure, a second buckle groove arranged on the top of the cone, and a bearing installed between the first buckle groove and the second buckle groove; A plurality of pushing edges distributed along the circumferential direction of the outer cylinder are arranged between the top of the cone and the bottom of the first buckle groove. The pushing edges are inclined on the horizontal plane and are fixed on the cone.

[0008] Further, the planting device further includes a power unit for providing power to the drilling structure. The power unit includes a threaded rod coaxially fixed inside the outer cylinder and a plurality of power rods circumferentially distributed around the threaded rod. The length direction of the power rods is parallel to the axis of the outer cylinder. A jack is provided at the middle position of the top of the cone. The bottom of the threaded rod and the bottom of the power rods are inserted into the jack. A slider is provided between adjacent two of the power rods. One side of the slider is fixed on the inner wall of the jack, and a threaded tooth is provided on the other side of the slider. The threaded tooth is used in cooperation with the threaded rod. The tops of the plurality of power rods are provided with power wheels, and the power wheels are rotatably installed inside the outer cylinder.

[0009] Further, an auxiliary wheel disc is rotatably provided on the outer wall of the power wheel, and the power wheel and the auxiliary wheel disc are connected by a torsion spring. A motor is fixed on the inner wall of the outer cylinder. The output end of the motor is provided with a transmission wheel, and the transmission wheel is in transmission connection with the auxiliary wheel disc.

[0010] Further, a voltage regulating unit is provided on the auxiliary wheel disc. The voltage regulating unit is used to regulate the voltage of the motor when the torsion spring undergoes elastic deformation.

[0011] Further, the voltage regulating unit includes an arc-shaped resistance plate fixed relative to the power wheel. The arc-shaped resistance plate is coaxial with the auxiliary wheel disc. A plurality of conductive rollers are rollably provided on the outer wall of the arc-shaped resistance plate, and the conductive rollers are rotatably installed on the auxiliary wheel disc. Among them, an external power supply supplies power to the motor through the arc-shaped resistance plate and the plurality of conductive rollers.

[0012] The beneficial effects of the present invention are as follows: By aggregating the soil excavated by the drilling structure and extruding and shaping it with the aid of the shaped ring, a cofferdam with a water-blocking function can be formed during the excavation process, avoiding the time waste of building the cofferdam separately, improving work efficiency, and using this method can avoid the manpower loss of manually dispersing the soil and building the cofferdam, and improve the degree of automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0014] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 Schematic structural view from another perspective; Figure 3 is the schematic structural view of the medium ring and the drilling structure in the embodiment of the present invention; Figure 4 is the schematic sectional view of the medium ring in the embodiment of the present invention; Figure 5 is the schematic structural view of the cone in the embodiment of the present invention; Figure 6 is Figure 4 the partial enlarged structural view at position A in Figure 7 is the schematic structural view of the power unit in the embodiment of the present invention; Figure 8 is the schematic structural view of the power wheel in the embodiment of the present invention.

[0015] Reference numerals: 1. Outer cylinder; 2. Medium ring; 3. Drilling structure; 4. Cone; 5. Support column; 6. Spiral plate; 7. First spiral part;8. Second spiral part; 9. Transition part; 10. First buckle groove; 11. Second buckle groove; 12. Bearing; 13. Pushing edge; 14. Threaded rod; 15. Power rod; 16. Slide block; 17. Power wheel; 18. Auxiliary wheel disc; 19. Torsion spring; 20. Motor; 21. Transmission wheel; 22. Arc-shaped resistor plate; 23. Conductive roller; 24. Contact switch. Detailed implementation manners

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0017] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0019] like Figures 1 to 8 As shown, an agricultural fruit tree seedling planting device of the present invention includes an outer cylinder 1 and a shaped ring 2 and a drilling structure 3 located inside the outer cylinder 1. The outer cylinder 1 opens downward, and the shaped ring 2 slides inside the outer cylinder 1 along the axis of the outer cylinder 1. The shaped ring 2 and the inner wall of the outer cylinder 1 form a groove structure with an opening facing downward. The shape of the groove structure is annular around the axis of the outer cylinder 1. The shaped ring 2 is rotatably connected to the drilling structure 3, and the drilling structure 3 is used to drill into the soil. In the present invention, the outer cylinder 1 can be placed on the ground and used to block the dust generated when the drilling structure 3 digs the soil, thereby effectively reducing environmental pollution. At the same time, the outer cylinder 1 can circle the soil excavated by the drilling structure 3 to prevent the soil from being scattered at will; the shape of the mold ring 2 is annular, and its cross-section is an obtuse angle shape. One side of the obtuse angle is located at the top and is horizontal, and the other side of the obtuse angle is inclined and located on the inner side of the mold ring 2. With the help of the inner wall of the outer cylinder 1, the obtuse angle shape can be transformed into an arch shape, and the opening of the arch faces downward. From the overall perspective, the mold ring 2 and the inner wall of the outer cylinder 1 form an annular groove structure, which is used to squeeze and shape the soil excavated by the drilling structure 3; the outer cylinder 1 can be installed on a vehicle such as agricultural machinery to facilitate movement; When the drill bit 3 is in the ground, the outer cylinder 1 is placed on the ground of the planting area, and the drilling structure 3 is used to break the soil and dig. The drilling structure 3 lifts the crushed soil upward and transports it to the ground around the drilling structure 3, that is, the crushed and lifted soil is located under the mold ring 2. As the drilling structure 3 drills into the ground, the mold ring 2 moves downward synchronously, and the soil near the inner wall of the outer cylinder 1 under the mold ring 2 gradually increases. When the mold ring 2 contacts the soil and squeezes it, the soil is compacted, and the groove structure composed of the outer cylinder 1 and the mold ring 2 can be used to shape the soil to form a ring-shaped cofferdam with a water-retaining function. At this time, the drilling depth of the drilling structure 3 reaches the specified requirement, and then the outer cylinder 1 is lifted, the mold ring 2 and the drilling structure 3 are stationary, and the mold ring 2 maintains a state of suppressing the soil to prevent the outer cylinder 1 from carrying the soil upward. When the mold ring 2 is separated from the outer cylinder 1, the mold ring 2 and the drilling structure 3 are lifted. At this time, a pit is formed in the planting area, and a cofferdam is present around the pit. By gathering the soil excavated by the drilling structure 3 and squeezing and shaping it with the help of the forming ring 2, a cofferdam with a water-retaining function can be formed during the excavation process, avoiding the time waste of building the cofferdam separately and improving work efficiency. In addition, by using this method, the manpower loss of manually breaking up the soil and building the cofferdam can be avoided, and the degree of automation can be improved.

[0020] Furthermore, the drilling structure 3 includes a cone 4, a support column 5 and a spiral plate 6. The support column 5 is installed at the bottom of the cone 4, and the spiral plate 6 is arranged around the cone 4 and the support column 5. Wherein, the shape of the spiral plate 6 is an inverted cone; The cone 4 and the support column 5 can support the spiral plate 6. The conical design of the spiral plate 6 can facilitate its drilling into the ground and crushing the soil to reduce the difficulty of soil excavation; the setting of the cone 4 can push the soil away from the axis of the cone 4 when the spiral plate 6 transports the soil upward, so that the soil is gathered toward the inner wall of the outer cylinder 1, reducing the temporary storage amount of soil on the drilling structure 3, thereby reducing the weight of the drilling structure 3 and facilitating the immediate extraction of the excavated soil.

[0021] Furthermore, the spiral plate 6 includes a spiral portion 1 7 located on the support column 5, a spiral portion 2 8 located on the cone 4, and a transition portion 9 connecting the spiral portion 1 7 and the spiral portion 2 8. The cross section of the spiral portion 1 7 is inclined upward, and the cross section of the spiral portion 2 8 is inclined downward. Since the cross section of the spiral part 7 is inclined upward, the angle between the upper surface of the spiral part 7 and the axis of the drilling structure 3 is an acute angle, which can facilitate the gathering and transportation of soil and prevent the soil from being near the inner wall of the pit and unable to be lifted and discharged from the pit by the drilling structure 3; the cross section of the spiral part 2 8 is inclined downward, so that the angle between the upper surface of the spiral part 2 8 and the axis of the drilling structure 3 is an obtuse angle, which can facilitate the natural scattering of soil on the upper surface of the spiral part 2 8 to the surroundings and prevent the soil from gathering on the spiral part 2 8; the structural mode of the spiral part 1 7 and the spiral part 2 8 can achieve the purpose of gathering, lifting and dispersing soil during excavation; the transition part 9 is mainly used to connect the spiral part 1 7 and the spiral part 2 8, so as to facilitate the transfer of soil from the spiral part 1 7 to the spiral part 2 8.

[0022] Furthermore, a connecting portion is provided between the shaped ring 2 and the drilling structure 3, and the connecting portion includes a buckle groove 10 provided on the inner ring of the shaped ring 2, a buckle groove 2 11 provided on the top of the cone 4, and a bearing 12 installed between the buckle groove 10 and the buckle groove 2 11; A plurality of pushing ribs 13 distributed along the circumference of the outer cylinder 1 are provided between the top of the cone 4 and the bottom of the buckle groove 10. The pushing ribs 13 are inclined on the horizontal plane and are fixed to the cone 4. As shown Figure 6 in the figure, the first clamping groove 10 and the second clamping groove 11 are respectively used to fix the outer ring and the inner ring of the bearing 12, so that the ring 2 and the drilling structure 3 are rotationally connected by using the bearing 12; during excavation, since there is a gap between the first clamping groove 10 and the cone 4, soil can easily enter the bearing 12 through the gap. To avoid this phenomenon, the present invention adopts the structure of a number of pushing edges 13. When the cone 4 rotates, the pushing edges 13 move synchronously. The soil that enters the gap between the first clamping groove 10 and the cone 4 will be pushed outward by the centrifugal force of the pushing edges 13, thereby achieving a dynamic sealing effect on the gap. The inclined setting of the pushing edges 13 can more effectively block the soil and improve the sealing effect.

[0023] Further, the planting device further includes a power unit for providing power to the drilling structure 3. The power unit includes a threaded rod 14 coaxially fixed inside the outer cylinder 1 and a number of power rods 15 circumferentially distributed around the threaded rod 14. The length direction of the power rods 15 is parallel to the axis of the outer cylinder 1; A jack is provided at the middle position of the top of the cone 4. The bottom of the threaded rod 14 and the bottom of the power rods 15 are both inserted into the jack. A slider 16 is provided between two adjacent power rods 15. One side of the slider 16 is fixed on the inner wall of the jack, and a thread tooth is provided on the other side of the slider 16. The thread tooth is used in cooperation with the threaded rod 14. The tops of a number of power rods 15 are provided with power wheels 17, and the power wheels 17 are rotatably installed inside the outer cylinder 1; The power wheels 17 can support one end of a number of power rods 15, and a number of sliders 16 can support the middle parts of a number of power wheels 17. When the power wheels 17 rotate, they will drive a number of power rods 15 and a number of sliders 16 to rotate synchronously. A number of sliders 16 drive the drilling structure 3 to rotate synchronously. Since the sliders 16 are threadedly connected to the threaded rod 14, the sliders 16 move synchronously in the vertical direction, and the sliders 16 drive the drilling structure 3 to move in the vertical direction, thereby realizing the rotary drilling operation of the drilling structure 3, and the sliders 16 slide relative to the power rods 15.

[0024] Further, an auxiliary wheel disc 18 is rotatably provided on the outer wall of the power wheel 17, and the power wheel 17 and the auxiliary wheel disc 18 are connected by a torsion spring 19; A motor 20 is fixed on the inner wall of the outer cylinder 1. The output end of the motor 20 is provided with a transmission wheel 21, and the transmission wheel 21 is in transmission connection with the auxiliary wheel disc 18; As shown Figure 8As shown, the motor 20 can provide rotational power to the power wheel 17 through the transmission wheel 21, the auxiliary wheel disc 18 and the torsion spring 19, thereby providing power to the drilling structure 3 through a number of power rods 15. When the drilling structure 3 excavates an area with greater hardness in the soil, in order to avoid damage to the motor 20 caused by the instantaneous reduction in the rotation speed of the power wheel 17, the present invention adopts a buffer structure of the auxiliary wheel disc 18 and the torsion spring 19, that is, when the rotation speed of the power wheel 17 drops instantaneously, the power wheel 17 and the auxiliary wheel disc 18 produce relative movement, and at this time the torsion spring 19 undergoes elastic deformation, thereby facilitating the buffering protection effect of the motor 20. When the power wheel 17 completes excavation of the area, the elastic force of the torsion spring 19 is released and accelerates the rotation speed of the power wheel 17 until the torsion spring 19 stabilizes in a natural state; using the above-mentioned buffer structure, the impact of the speed fluctuation during excavation of the drilling structure 3 on the motor 20 can be effectively reduced, thereby improving the operating stability of the equipment.

[0025] Furthermore, a voltage regulating unit is provided on the auxiliary wheel 18, and the voltage regulating unit is used to adjust the voltage of the motor 20 when the torsion spring 19 is elastically deformed; When the torsion spring 19 undergoes elastic deformation, the digging difficulty of the drilling structure 3 increases. At this time, the voltage of the motor 20 can be adjusted by the voltage regulating unit to adjust the speed and torque output by the motor 20 to ensure that the drilling structure 3 has sufficient power to dig the soil, thereby avoiding equipment shutdown due to insufficient power.

[0026] Furthermore, the voltage regulating unit includes an arc-shaped resistor plate 22 fixed relative to the power wheel 17, the arc-shaped resistor plate 22 is coaxial with the auxiliary wheel disc 18, and a plurality of conductive rollers 23 are rollingly provided on the outer wall of the arc-shaped resistor plate 22, and the conductive rollers 23 are rotatably mounted on the auxiliary wheel disc 18; The external power supply supplies power to the motor 20 via an arc-shaped resistor plate 22 and a plurality of conductive rollers 23; like Figure 8 As shown, several conductive rollers 23 are arranged in an arc shape and are all in contact with the arc-shaped resistor plate 22. This can achieve a multi-point connection between the arc-shaped resistor plate 22 and the conductive rollers 23, thereby improving the current transmission effect and avoiding the problem that when a single conductive roller 23 is used in conjunction with the arc-shaped resistor plate 22, the contact area is small, which leads to a limited current transmission speed; The arc-shaped resistor plate 22 and the power wheel 17 can be connected by a fixing plate, a connecting frame and other structures to support and fix the arc-shaped resistor plate 22; When the torsion spring 19 undergoes elastic deformation, the driving wheel 17 and the auxiliary wheel disc 18 rotate relative to each other. At this time, a plurality of conductive rollers 23 and the arc-shaped resistor plate 22 move relative to each other, that is, the conductive rollers 23 roll on the arc-shaped resistor plate 22, and the length of the arc-shaped resistor plate 22 connected to the circuit changes, thereby adjusting the voltage proportion of the arc-shaped resistor plate 22 in the circuit, which is convenient for adjusting the voltage of the motor 20; Since the output torque of the motor 20 has a limit value, in order to avoid damage to the motor 20, a contact switch 24 is provided at one end of the arc-shaped resistor plate 22. The connection position between the torsion spring 19 and the auxiliary wheel disc 18 can cooperate with the contact switch 24. When the relative rotation angle of the auxiliary wheel disc 18 with respect to the driving wheel 17 is too large, the connection position between the auxiliary wheel disc 18 and the torsion spring 19 will abut against the contact switch 24. At this time, the contact switch 24 can control the motor 20 to stop rotating.

[0027] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. An agricultural fruit tree sapling planting device, characterized in that, It includes an outer cylinder, a shaped ring and a drilling structure located inside the outer cylinder. The outer cylinder has an opening facing downwards. The shaped ring slides along the axis direction of the outer cylinder inside the outer cylinder, and the shaped ring and the inner wall of the outer cylinder form a trough-shaped structure with an opening facing downwards. The shape of the trough-shaped structure is an annulus around the axis of the outer cylinder. The shaped ring is rotationally connected to the drilling structure, and the drilling structure is used for drilling into the soil.

2. The agricultural fruit tree sapling planting device according to claim 1, characterized in that, The drilling structure includes a cone, a support column and a spiral plate. The support column is installed at the bottom of the cone, and the spiral plate is arranged around the cone and the support column. Among them, the shape of the spiral plate is an inverted cone.

3. The agricultural fruit tree sapling planting device according to claim 2, wherein, The spiral plate includes a first spiral part located on the support column, a second spiral part located on the cone, and a transition part connecting the first spiral part and the second spiral part. The cross-section of the first spiral part is inclined upwards, and the cross-section of the second spiral part is inclined downwards.

4. An agricultural fruit tree sapling planting device according to claim 3, characterized in that, A connecting part is arranged between the shaped ring and the drilling structure. The connecting part includes a first clamping groove arranged on the inner circle of the shaped ring, a second clamping groove arranged at the top of the cone, and a bearing installed between the first clamping groove and the second clamping groove. A number of pushing edges distributed along the circumferential direction of the outer cylinder are arranged between the top of the cone and the bottom of the first clamping groove. The pushing edges are inclined on the horizontal plane and are fixed on the cone.

5. The agricultural fruit tree sapling planting device according to claim 4, wherein, The planting device further includes a power unit for providing power to the drilling structure. The power unit includes a threaded rod coaxially fixed inside the outer cylinder and a number of power rods circumferentially distributed around the threaded rod. The length direction of the power rods is parallel to the axis of the outer cylinder. A jack is opened at the middle position of the top of the cone. The bottom of the threaded rod and the bottom of the power rods are inserted into the jack. A slider is arranged between two adjacent power rods. One side of the slider is fixed on the inner wall of the jack, and the other side of the slider is provided with a thread tooth. The thread tooth is used in cooperation with the threaded rod. The tops of a number of the power rods are provided with power wheels, and the power wheels are rotatably installed inside the outer cylinder.

6. The agricultural fruit tree sapling planting device according to claim 5, wherein, An auxiliary wheel disc is rotatably arranged on the outer wall of the power wheel, and the power wheel and the auxiliary wheel disc are connected by a torsion spring. A motor is fixed on the inner wall of the outer cylinder, and a transmission wheel is arranged at the output end of the motor. The transmission wheel is in transmission connection with the auxiliary wheel disc.

7. The agricultural fruit tree sapling planting device according to claim 6, wherein, A voltage regulating unit is arranged on the auxiliary wheel disc. The voltage regulating unit is used for regulating the voltage of the motor when the torsion spring undergoes elastic deformation.

8. An agricultural fruit tree sapling planting device according to claim 7, characterized in that, The voltage regulating unit includes an arc-shaped resistance plate fixed relative to the power wheel. The arc-shaped resistance plate is coaxial with the auxiliary wheel disc. A number of conductive rollers are rollingly arranged on the outer wall of the arc-shaped resistance plate, and the conductive rollers are rotatably installed on the auxiliary wheel disc. Among them, an external power supply supplies power to the motor through the arc-shaped resistance plate and a number of conductive rollers.

Citation Information

Patent Citations

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