Magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material

Abstract

The application discloses a magnetic suspension treadmill with high heat dissipation performance based on graphene heat dissipation material, which comprises a rack, a running belt, a driving mechanism, a handrail assembly, a limiting mechanism and an adaptive adjustment magnetic suspension mechanism, and a deformation detection unit, and initial position positioning devices are arranged on both sides of the running plate; a carbon fiber bundle-graphene heat conduction material is arranged on the bottom of the driving motor, and the carbon fiber bundle-graphene heat conduction material is prepared through a carbon fiber bundle multi-stage directional arrangement method; the adaptive adjustment magnetic suspension mechanism cooperates with the limiting mechanism and the deformation detection unit, on one hand, can realize the effect of the magnetic suspension treadmill, and on the other hand, can realize adjustable suspension force, adaptive matching according to different body types of users, and achieve the best buffering effect; in addition, the multi-stage magnetic attraction arrangement is used to arrange the carbon fiber bundle in a high direction, which greatly improves the heat conduction performance of the treadmill motor and prolongs the service life of the motor.

Description

Technical Field

[0001] This invention belongs to the field of treadmill technology, and specifically relates to a magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material. 。 Background Technology

[0002] Existing treadmills include a base frame and a running board. The running board is positioned above the base frame, and there is generally an elastic buffer or a rigid connection between the base frame and the running board. The elastic buffer, compared to a rigid connection, reduces the impact on the user's knees and other areas when they step on the running board. Currently, most elastic buffers are based on spring designs. Publication number CN213313143U discloses a buffer structure between the treadmill support plate and frame. This buffer structure includes a first magnet located on the underside of the support plate and a second magnet located on the frame. The positions and number of the two magnets correspond to the first magnet, and the opposing surfaces of the first and second magnets repel each other magnetically. The drawback of this structure is that its rebound elasticity is fixed and cannot be adjusted according to the individual user's situation. Secondly, in existing treadmills, the upward support force on the running board is a fixed value. That is to say, if the user's weight is small, running on the running board is basically the same as running on solid ground, with no cushioning effect. If the weight is too large, the running board will be subjected to too much impact, and the elastic cushioning component will deform too much, which will seriously reduce its service life.

[0003] In addition, when a treadmill is in use, the motor driving the running belt generates a lot of heat. Excessive heat directly affects the motor's lifespan and the performance of surrounding components, thus reducing the overall system's stability. Therefore, it's necessary to cool the treadmill motor. Existing motor cooling structures typically involve creating ventilation holes in the treadmill's base and installing a fan at the motor's tail to conduct heat away from the treadmill casing. The drawback of this structure is its low thermal conductivity; the heat generated by the motor remains inside the treadmill casing, resulting in slow heat dissipation. Graphene is a... High heat dissipation materials possess outstanding thermal conductivity (5000 W / (m·K)) and exceptional specific surface area (2630 m² / g), and can be applied to solid surfaces, exhibiting excellent processing properties, making them ideal heat dissipation materials. However, due to graphene's two-dimensional structure, its heat dissipation mechanism can only diffuse the heat emitted from the battery surface horizontally to the surrounding materials, which to some extent weakens the material's heat dissipation effect. Furthermore, because graphene has a very large specific surface area, it is prone to agglomeration. If graphene agglomerates and polymerizes with composite materials during preparation, it will greatly reduce the material's performance. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material, so as to solve the problems mentioned in the background art. 。

[0005] To solve this technical problem, the technical solution of the present invention is as follows:

[0006] A magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material includes a frame, which includes a base frame and a running board disposed above the base frame. It also includes a running belt, a drive mechanism, and a handrail assembly. The drive mechanism includes a drive motor, and a front roller and a rear roller fixed to the frame. The drive motor is driven and connected to the front roller, and the running belt is driven and connected to the front roller and the rear roller and wraps around the running board. Its characteristic is that:

[0007] It also includes a limiting mechanism, which holds the running board at an inclined angle and allows it to move up and down elastically above the base frame. An adaptive magnetic levitation mechanism is provided between the base frame and the running board. The adaptive magnetic levitation mechanism applies an upward supporting and restoring force to the running board. It also includes a deformation detection unit, which detects the degree to which the running board is pressed down when used by different users. The adaptive magnetic levitation mechanism also adjusts the magnitude of the supporting and restoring force based on the data measured by the deformation detection unit.

[0008] The running board is also equipped with initial position positioning devices on both sides to determine the user's initial standing position on the running board.

[0009] A carbon fiber bundle-graphene thermal conductive material is disposed on the bottom of the drive motor. One end of the carbon fiber bundle-graphene thermal conductive material is attached to the bottom of the drive motor, and the other end is exposed on the bottom surface of the treadmill. The carbon fiber bundle-graphene thermal conductive material is prepared by a multi-level directional arrangement method of carbon fiber bundles.

[0010] Preferably, side tubes are fixed on both sides of the running belt, including a left tube and a right tube. The limiting mechanism includes a buffer pad assembly disposed between the front end of the left tube and the right tube and the base frame. A pivot fixing seat is disposed between the rear end of the left tube and the right tube and the base frame.

[0011] Preferably, the adaptive adjustment magnetic levitation mechanism includes a first levitation unit and a second levitation unit. The first levitation unit and the second levitation unit are respectively disposed between the base frame and the two sides of the running board. The first levitation unit and the second levitation unit have the same structure, each including a first electromagnet disposed on the base frame and a second electromagnet located directly above the first electromagnet and fixed on the side tube of the running board; and the first electromagnet and the second electromagnet are magnetically repelled. Both the first electromagnet and the second electromagnet are connected to a transformer power supply unit.

[0012] The first electromagnet and the second electromagnet have the same structure, both including an iron core and a coil wound around the outside of the iron core. The coil is electrically connected to the transformer power supply unit. For easy installation, the base frame is provided with a cavity for placing the first electromagnet, and the corresponding side tube is provided with a cavity for placing the second electromagnet.

[0013] Preferably, the transformer power supply unit includes five sets of transformer circuits connected in parallel.

[0014] The transformer circuit of this invention uses conventional components and may include an external input voltage. The output terminals of the external input voltage are connected in parallel to a first transformer T1, a second transformer T2, a third transformer T3, a third transformer T4, and a third transformer T5.

[0015] The first transformer T1 is connected in series with the first switching transistor Q1 and the first relay K1;

[0016] The second transformer T2 is connected in series with the second switching transistor Q2 and the second relay K2;

[0017] The third transformer T3 is connected in series with the third switching transistor Q3 and the third relay K3;

[0018] The fourth transformer T4 is connected in series with the fourth switching transistor Q4 and the fourth relay K4;

[0019] The fifth transformer T5 is connected in series with the fifth switching transistor Q5 and the fifth relay K5;

[0020] The first switch Q1, the second switch Q2, the third switch Q3, the third switch Q4, and the third switch Q5 are also connected to a control unit. The control unit controls the opening or closing of the first switch Q1, the second switch Q2, the third switch Q3, the third switch Q4, and the third switch Q5, corresponding to the output of five sets of voltages, namely U1, U2, U3, U4, and U5.

[0021] Different voltages are applied to the first and second electromagnets according to the user's weight, thereby adjusting the restoring force between the running board and the base frame.

[0022] Preferably, the system includes five sets of variable voltages, with voltage values ​​U1, U2, U3, U4, and U5, respectively; and U1 < U2 < U3 < U4 < U5; the adaptive adjustment magnetic levitation mechanism also adjusts the magnitude of the support restoring force based on data measured by the deformation detection unit, including the following steps:

[0023] Q1: Set the optimal downward pressure distance of the running board to S;

[0024] Q2: The user determines their initial position on the running board using the initial position positioning device;

[0025] Q3: Start the treadmill and apply a voltage of U3 to the adaptive magnetic levitation mechanism;

[0026] Q4: The distance of N consecutive downward presses on the running board is measured by the deformation detection unit and denoted as: L1, L2...L N ;

[0027] Q5: Calculate the average distance L3' pressed down by the running board = (L1 + L2 ... L... N ) / N;

[0028] Q6: Calculate the difference between the average downward distance L3' of the running board and the optimal downward distance S, and take the absolute value of the difference, denoted as E3=|L3'-S|;

[0029] Q7: If the difference is negative, apply voltages U1 and U2 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average downward distance L1' and the optimal downward distance S of the running board when the voltage is U1, denoted as E1=|L1'-S|; and the absolute value of the difference between the average downward distance L2' and the optimal downward distance S of the running board when the voltage is U2, denoted as E2=|L2'-S|; take the minimum value among E1, E2, and E3, and use the voltage value applied to the adaptive magnetic levitation mechanism corresponding to the minimum value as the working voltage value;

[0030] Q8: If the difference is positive, apply voltages U4 and U5 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average downward distance L4' and the optimal downward distance S of the running board when the voltage is U4, denoted as E4=|L4'-S|; and the absolute value of the difference between the average downward distance L5' and the optimal downward distance S of the running board when the voltage is U5, denoted as E5=|L5'-S|; take the minimum value among E5, E4, and E3, and use the voltage value applied to the adaptive magnetic levitation mechanism corresponding to the minimum value as the working voltage value.

[0031] This invention changes the magnetism of the first and second electromagnets by altering the voltage applied to them. The stronger the magnetism, the greater the supporting and restoring force on the running board, and vice versa.

[0032] Preferably, the deformation detection unit is located on the side of the cushioning pad assembly, including a laser emitter and a laser receiver arranged opposite each other. The laser emitter is fixedly connected to the bottom surface of the running board side tube, and the laser receiver is fixed to the base frame.

[0033] Preferably, the initial position positioning device is an infrared generator and an infrared receiver, which are respectively mounted on the frame and located on both sides of the running belt.

[0034] Preferably, the carbon fiber bundle-graphene thermal conductive material is prepared by a multi-level oriented arrangement method of carbon fiber bundles, comprising the following steps:

[0035] S1: Prepare carbon fiber bundles with magnetic attraction segments;

[0036] S2: Preparation of graphene suspension;

[0037] S3: Thoroughly mix the materials obtained in step S1 and step S2 to obtain a carbon fiber bundle-graphene suspension.

[0038] S4: After the carbon fiber bundles in the mixture are arranged in a multi-level orientation using a magnetic attraction arrangement device, a carbon fiber bundle-graphene thermal conductive material is formed by freeze drying.

[0039] S5: The top surface of the carbon fiber bundle-graphene thermal conductive material is cut and ground to form an arc surface that fits onto the bottom surface of the drive motor.

[0040] Preferably, the magnetic arrangement device includes several electromagnet units that can be telescopically connected, each electromagnet unit forming a working area, and an outer container placed on the working area; its outer contour coincides with the outer edge of the working area, and each electromagnet unit is connected to an independent magnetic switch control system to form a multi-level magnetic arrangement area.

[0041] A method for orienting carbon fiber bundles in a mixture using a magnetic alignment device includes the following sub-steps:

[0042] S41: Activate the peripheral electromagnet unit, which uses magnetic force to attract the carbon fiber bundle to the outer ring of the bottom surface of the container.

[0043] S42: Stir the mixture to cause the carbon fiber bundles that are not magnetically attracted to detach from the outer ring of the bottom surface of the container.

[0044] S43: Raise the central electromagnet unit to the same plane as the outer electromagnet units and open it, so that the detached carbon fiber bundles are re-adsorbed at the center of the bottom surface of the container.

[0045] S44: Continue stirring the mixture so that the carbon fiber bundles that are not magnetically attracted in the mixture detach from the bottom of the container and rearrange for adsorption.

[0046] When a large number of carbon fiber bundles are adsorbed onto a local electromagnet unit, due to limited space, they may be adsorbed onto the root of the carbon fiber bundle, resulting in insufficient adsorption force. After moderate vibration, the carbon fiber bundles can be detached.

[0047] This invention uses a magnetic arrangement device to pre-arrange carbon fiber bundles in a highly oriented array in the mixture, so that the heat conduction path of the thermally conductive material is continuous from bottom to top, which greatly improves the thermal conductivity of the material.

[0048] Preferably, the magnetic attraction arrangement device includes a primary electromagnet unit, a secondary electromagnet unit, and a tertiary electromagnet unit. Each electromagnet unit forms a primary magnetic attraction arrangement area, a secondary magnetic attraction arrangement area, and a tertiary magnetic attraction arrangement area from the inside to the outside on the bottom surface of the container holding the mixture.

[0049] Furthermore, the first-level electromagnet unit is telescopically connected within the second-level electromagnet unit, and the second-level electromagnet unit is telescopically connected within the third-level electromagnet unit;

[0050] The method for directional alignment of carbon fiber bundles includes the following sub-steps:

[0051] S411: Activate the three-stage electromagnet unit for 5 seconds, apply a voltage of 12V, and form a magnetic force in the three-stage magnetic attraction arrangement area to attract the carbon fiber bundle to the three-stage magnetic attraction arrangement area on the bottom surface of the container.

[0052] S412: Stir the mixture to cause the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the three-level magnetic attraction arrangement area on the bottom surface of the container;

[0053] S413: The secondary electromagnet unit is raised to the same plane as the tertiary electromagnet unit and turned on for 4 seconds. A voltage of 14V is applied, and a magnetic force is formed in the secondary magnetic attraction arrangement area to attract the detached carbon fiber bundles to the secondary magnetic attraction arrangement area on the bottom surface of the container.

[0054] S414: Stirring the mixture causes the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the tertiary magnetic attraction arrangement area and the secondary arrangement area on the bottom surface of the container.

[0055] S415: The primary electromagnet unit is raised to the same plane as the secondary electromagnet unit and turned on for 4 seconds. A voltage of 16V is applied. Magnetic force is formed in the primary magnetic attraction arrangement area to attract the detached carbon fiber bundles to the primary magnetic attraction arrangement area on the bottom surface of the container, thereby forming a uniformly arranged array of carbon fiber bundles.

[0056] Preferably, the electromagnet unit includes a central electromagnet group, an inner circle electromagnet group, and an outer circle electromagnet group;

[0057] The outer ring electromagnet assembly includes an outer ring iron core, which is a hollow structure. A first coil winding area is formed on the surface of the outer ring iron core. A first coil is wound inside the first coil winding area. A first shell is provided outside the first coil winding area.

[0058] The inner ring electromagnet assembly includes an inner ring iron core, which is a hollow structure. A second coil winding area is formed on the surface of the inner ring iron core. A second coil is wound in the second coil winding area. A second housing is provided outside the second coil winding area. The second housing is slidably connected to the outer ring iron core through a first sliding component.

[0059] The central electromagnet assembly includes a central iron core, a third coil winding area is formed on the surface of the central iron core, a third coil is wound in the third coil winding area, and a third housing is disposed outside the third coil winding area; the third housing is slidably connected to the second housing through a second sliding component;

[0060] The first, second, and third coils are connected to the magnetic switch control system.

[0061] The magnetic switch control system is an existing technology. Specifically, it can include a power supply, a switch, a diode, and a transformer that are electrically connected to the electromagnet unit. By setting a diode on the circuit of the electromagnet, the induced current can be blocked through the diode after the power supply is turned off, so that the magnetism of the electromagnet disappears immediately, thereby improving the demagnetization efficiency of the electromagnet and avoiding affecting the next working cycle.

[0062] The beneficial effects of the present invention, as described above, are:

[0063] This invention achieves a treadmill suspension effect through an adaptively adjustable magnetic levitation mechanism in conjunction with a limiting mechanism and a deformation detection unit. The levitation force is adjustable to adapt to different user body types for optimal cushioning. Furthermore, the multi-level magnetic arrangement of carbon fiber bundles creates a highly directional arrangement, forming a continuous heat conduction path from bottom to top. This multi-level magnetic arrangement makes the carbon fiber bundles more stable and uniform compared to existing directional arrangement technologies, increasing the product's thermal conductivity by over 30%. This significantly improves the treadmill motor's thermal conductivity and extends its lifespan. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the structure of the present invention;

[0065] Figure 2 This is a partial structural schematic diagram of the present invention;

[0066] Figure 3 yes Figure 2 A magnified structural diagram of A in the middle;

[0067] Figure 4 This is a schematic diagram of the motor mounting structure of the present invention;

[0068] Figure 5 This is a schematic diagram of the structure of the motor mounting base plate of the present invention;

[0069] Figure 6 This is a schematic diagram of the base frame structure in this invention;

[0070] Figure 7 This is a schematic diagram of the magnetic arrangement device in this invention;

[0071] Figure 8 This is a schematic diagram of the multi-level magnetic attraction arrangement area structure in Embodiment 1 of the present invention;

[0072] Figure 9 This is a graph showing the temperature change inside the treadmill in Embodiment 1 of the present invention.

[0073] Figure 10 This is a graph showing the temperature change inside the treadmill in Comparative Example 1 of this invention.

[0074] Figure 11 This is a graph showing the temperature change inside the treadmill in Comparative Example 2 of this invention. Detailed Implementation

[0075] like Figure 1-11 As shown, in order to further explain the technical solution of the present invention, the present invention will be described in detail below through specific embodiments.

[0076] Example 1

[0077] A magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material includes a frame 1, which includes a base frame 2 and a running board 3 disposed above the base frame. It also includes a running belt 4, a drive mechanism, and a handrail assembly 5. The connection method between the handrail assembly and the frame is disclosed in patent 202021017745.6 and will not be repeated here. The drive mechanism includes a drive motor 6, and a front roller 7 and a rear roller 8 fixed to the frame. The drive motor is driven and connected to the front roller, and the running belt is driven and connected to the front roller and the rear roller and wraps around the running board. The running board is described above; this is a conventional technical means and will not be described in detail here. It also includes a limiting mechanism, which sets the running board at an inclined angle and allows it to move up and down elastically above the base frame. In this embodiment, side tubes 9 are fixed on both sides of the running belt. The side tubes and the running belt are fixedly connected by a connecting piece (not shown). The side tubes include a left tube and a right tube. The limiting mechanism includes a buffer pad assembly 10 set between the front end of the left tube and the right tube and the base frame. The buffer pad assembly is made of rubber. A pivot fixing seat 11 is set between the rear end of the left tube and the right tube and the base frame.

[0078] An adaptive magnetic levitation mechanism 12 is provided between the base frame and the running board; the adaptive magnetic levitation mechanism applies an upward supporting and restoring force to the running board;

[0079] The adaptive magnetic levitation mechanism includes a first levitation unit and a second levitation unit. The first levitation unit and the second levitation unit are respectively disposed between the base frame and the two sides of the running board. The first levitation unit and the second levitation unit have the same structure, each including a first electromagnet 21 disposed on the base frame and a second electromagnet 22 located directly above the first electromagnet and fixed on the side tube of the running board; and the first electromagnet and the second electromagnet are magnetically repulsive. Both the first electromagnet and the second electromagnet are connected to a transformer power supply unit.

[0080] The first electromagnet and the second electromagnet have the same structure, both including an iron core and a coil wound around the outside of the iron core. The coil is electrically connected to the transformer power supply unit. For easy installation, the base frame is provided with a cavity for placing the first electromagnet, and the corresponding side tube is provided with a cavity for placing the second electromagnet. The transformer power supply unit includes five sets of transformer circuits arranged in parallel.

[0081] The transformer circuit of this invention uses conventional components and may include an external input voltage. The output terminals of the external input voltage are connected in parallel to a first transformer T1, a second transformer T2, a third transformer T3, a third transformer T4, and a third transformer T5.

[0082] The first transformer T1 is connected in series with the first switching transistor Q1 and the first relay K1;

[0083] The second transformer T2 is connected in series with the second switching transistor Q2 and the second relay K2;

[0084] The third transformer T3 is connected in series with the third switching transistor Q3 and the third relay K3;

[0085] The fourth transformer T4 is connected in series with the fourth switching transistor Q4 and the fourth relay K4;

[0086] The fifth transformer T5 is connected in series with the fifth switching transistor Q5 and the fifth relay K5;

[0087] The first switch Q1, the second switch Q2, the third switch Q3, the third switch Q4, and the third switch Q5 are also connected to a control unit. The control unit controls the opening or closing of the first switch Q1, the second switch Q2, the third switch Q3, the third switch Q4, and the third switch Q5, corresponding to the output of five sets of voltages, namely U1, U2, U3, U4, and U5.

[0088] Different voltages are applied to the first and second electromagnets according to the user's weight, thereby adjusting the restoring force between the running board and the base frame.

[0089] This embodiment includes five sets of variable voltages, with voltage values ​​U1, U2, U3, U4, and U5 respectively; and U1 < U2 < U3 < U4 < U5; the adaptive adjustment magnetic levitation mechanism also adjusts the magnitude of the support restoring force according to the data measured by the deformation detection unit, including the following steps:

[0090] Q1: Set the optimal downward pressure distance of the running board to S;

[0091] Q2: The user determines their initial position on the running board using the initial position positioning device;

[0092] Q3: Start the treadmill and apply a voltage of U3 to the adaptive magnetic levitation mechanism;

[0093] Q4: The distance of N consecutive downward presses on the running board is measured by the deformation detection unit and denoted as: L1, L2...L N ;

[0094] Q5: Calculate the average distance L3' pressed down by the running board = (L1 + L2 ... L... N ) / N;

[0095] Q6: Calculate the difference between the average downward distance L3' of the running board and the optimal downward distance S, and take the absolute value of the difference, denoted as E3=|L3'-S|;

[0096] Q7: If the difference is negative, apply voltages U1 and U2 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average downward distance L1' and the optimal downward distance S of the running board when the voltage is U1, denoted as E1=|L1'-S|; and the absolute value of the difference between the average downward distance L2' and the optimal downward distance S of the running board when the voltage is U2, denoted as E2=|L2'-S|; take the minimum value among E1, E2, and E3, and use the voltage value applied to the adaptive magnetic levitation mechanism corresponding to the minimum value as the working voltage value;

[0097] Q8: If the difference is positive, apply voltages U4 and U5 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average downward distance L4' and the optimal downward distance S of the running board when the voltage is U4, denoted as E4=|L4'-S|; and the absolute value of the difference between the average downward distance L5' and the optimal downward distance S of the running board when the voltage is U5, denoted as E5=|L5'-S|; take the minimum value among E5, E4, and E3, and use the voltage value applied to the adaptive magnetic levitation mechanism corresponding to the minimum value as the working voltage value.

[0098] This invention changes the magnetism of the first and second electromagnets by altering the voltage applied to them. The stronger the magnetism, the greater the supporting and restoring force on the running board, and vice versa.

[0099] It also includes a deformation detection unit for detecting the degree of pressure on the running board when used by different users; the deformation detection unit is located on the side of the cushioning pad assembly, and includes a laser emitter (not shown) and a laser receiver 14 arranged opposite each other. The laser emitter is fixedly connected to the bottom surface of the running board side tube, and the laser receiver is fixed to the base frame. The adaptive adjustment magnetic levitation mechanism also adjusts the magnitude of the support restoring force according to the data measured by the deformation detection unit.

[0100] The running board is also equipped with an initial position positioning device 15 on both sides to determine the user's initial position on the running board. The initial position positioning device is an infrared generator 16 and an infrared receiver (not shown). The infrared generator and the infrared receiver are respectively installed on the frame and located on the protective covers on both sides of the running belt.

[0101] The drive motor is connected to the base frame via a connecting bracket 17. A fan 20 is connected to the end of the drive motor, and a carbon fiber bundle-graphene thermal conductive material is provided on its bottom. One end of the carbon fiber bundle-graphene thermal conductive material is attached to the bottom of the drive motor, and the other end is exposed on the bottom surface of the treadmill. During installation, the bottom of the motor is attached to the top surface of the carbon fiber bundle-graphene thermal conductive material, and the motor is fixed to the base frame. A window 18 is opened on the bottom surface of the base frame, and the bottom end of the carbon fiber bundle-graphene thermal conductive material is placed in the window. The bottom surface of the carbon fiber bundle-graphene thermal conductive material is on the same plane as the bottom surface of the base frame. Several ventilation slots 19 are also opened on the side of the window.

[0102] In this embodiment, the heat generated by the motor is directly discharged to the outside of the base frame, and the heat will not accumulate inside the base frame. In addition, with the action of the fan and the up and down movement of the running board, the airflow inside the treadmill is exchanged, which greatly accelerates the heat dissipation rate of the motor.

[0103] The carbon fiber bundle-graphene thermal conductive material was prepared by a multi-level directional arrangement method of carbon fiber bundles.

[0104] The carbon fiber bundle-graphene thermal conductive material is prepared by a multi-level oriented arrangement method of carbon fiber bundles, including the following steps:

[0105] S1: Prepare a carbon fiber bundle with a magnetic attraction section; take a carbon fiber bundle with a length of 3cm, wrap an aluminum foil around the carbon fiber bundle and expose a bare end with a length of 0.5mm; use a pulsed laser vapor deposition device to deposit a cobalt film on the bare end; in this embodiment, the pulse frequency is 4.5Hz and the background gas pressure is 8Pa; after completion, use a magnifying glass to observe whether the bare end of the carbon fiber bundle is uniformly covered with a cobalt film. The bare end after the cobalt film is deposited will appear silver-gray or can be detected by magnetic attraction.

[0106] S2: Preparation of graphene suspension; Graphene and hydrazine were added to the reaction vessel at a ratio of 1:1.5, ultrasonically dispersed for 2 hours, then heated to 100℃ and reacted for 4 hours to obtain graphene precipitate; The precipitate was washed three times with anhydrous ethanol, and then 3 times the amount of water was added again for ultrasonic dispersion to obtain graphene suspension.

[0107] S3: The materials obtained in step S1 and step S2 are thoroughly mixed in a ratio of 1:5 to obtain a carbon fiber bundle-graphene suspension; wherein the height of the carbon fiber bundle-graphene suspension does not exceed the length of the carbon fiber bundle.

[0108] S4: After the carbon fiber bundles in the mixture are arranged in a multi-level orientation using a magnetic attraction arrangement device, a carbon fiber bundle-graphene thermal conductive material is formed by freeze drying.

[0109] The magnetic attraction arrangement device includes a primary electromagnet unit 100, a secondary electromagnet unit 200, and a tertiary electromagnet unit 300. Each electromagnet unit forms a primary magnetic attraction arrangement area 101, a secondary magnetic attraction arrangement area 102, and a tertiary magnetic attraction arrangement area 103 from the inside to the outside on the bottom surface of the container holding the mixture. The primary electromagnet unit is telescopically connected to the secondary electromagnet unit, and the secondary electromagnet unit is telescopically connected to the tertiary electromagnet unit.

[0110] Specifically: including the frame, the three-stage electromagnet unit 300 includes an outer core 104, which is hollow, with a first coil winding area 105 formed on its surface, a first coil 106 wound within the first coil winding area, and a first housing 107 disposed outside the first coil winding area; the two-stage electromagnet unit includes an inner core 108, which is hollow, with a second coil winding area 109 formed on its surface, a second coil 110 wound within the second coil winding area, and a second housing 111 disposed outside the second coil winding area; the second... The housing is slidably connected to the outer iron core via a first sliding assembly; the first sliding assembly is a first cylinder 112. The three-stage electromagnet unit includes a central iron core 113, a third coil winding area 114 formed on the surface of the central iron core, a third coil 115 wound within the third coil winding area, and a third housing 116 disposed outside the third coil winding area; the third housing is slidably connected to the second housing via a second sliding assembly; the second sliding assembly is a second cylinder 117. The first coil, second coil, and third coil are connected to a magnetic switch control system. The first housing 107 can be fixed to a frame. The magnetic switch control system is existing technology and may specifically include a power supply, a switch, a diode, and a transformer electrically connected to the electromagnet unit. By placing a diode in the electromagnet's circuit, the induced current can be blocked by the diode after the power supply is cut off, causing the electromagnet's magnetism to disappear immediately, thereby improving the electromagnet's demagnetization efficiency and avoiding impact on the next working cycle.

[0111] The method for directional alignment of carbon fiber bundles includes the following sub-steps: S411: Activate the tertiary electromagnet unit for 6 seconds, apply a voltage of 16V, and generate a magnetic force in the tertiary magnetic alignment area to attract the carbon fiber bundles to the tertiary magnetic alignment area on the bottom surface of the container; S412: Stir the mixture to cause the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the tertiary magnetic alignment area on the bottom surface of the container; S413: Raise the secondary electromagnet unit to the same plane as the tertiary electromagnet unit and activate it for 4 seconds, apply a voltage of 18V, and generate a magnetic force in the secondary magnetic alignment area to attract the detached carbon fiber bundles. S414: Stir the mixture to cause the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the tertiary magnetic attraction area and the secondary magnetic attraction area on the bottom surface of the container; S415: Raise the primary electromagnet unit to the same plane as the secondary electromagnet unit and turn it on for 4 seconds, apply a voltage of 24V, and form a magnetic force in the primary magnetic attraction area to attract the detached carbon fiber bundles back to the primary magnetic attraction area on the bottom surface of the container, thereby forming a uniformly arranged array of carbon fiber bundles; The electromagnet unit includes a central electromagnet group, an inner ring electromagnet group, and an outer ring electromagnet group;

[0112] S6: Liquid nitrogen is added to the outer container, and the mixture is freeze-dried to form a carbon fiber bundle-graphene thermal conductive material on the surface of the copper flat tube; specifically: it is frozen at -70℃ for 8 hours, and then freeze-dried under vacuum (vacuum degree is 0.1~2Pa, drying time is 72 hours);

[0113] S5: The top surface of the carbon fiber bundle-graphene thermal conductive material is cut and ground to form an arc surface that fits onto the bottom surface of the drive motor.

[0114] Comparative Example 1

[0115] The difference from Example 1 is that: a window is directly opened on the bottom surface of the base frame, and carbon fiber bundle-graphene thermal conductive material is not used for heat conduction.

[0116] Comparative Example 2

[0117] The difference from Comparative Example 1 is that, in preparing the carbon fiber bundle-graphene thermal conductive material, multi-level directional alignment of the carbon fiber bundles is not performed; the specific method is as follows:

[0118] A graphene suspension was prepared by adding graphene and hydrazine in a ratio of 1:1.5 into a reaction vessel, ultrasonically dispersing for 2 hours, then heating to 100℃ and reacting for 4 hours to obtain a graphene precipitate. The precipitate was washed three times with anhydrous ethanol, and then three times the amount of water was added again for ultrasonic dispersion to obtain a graphene suspension. Carbon fiber bundles and the graphene suspension were thoroughly mixed in a ratio of 1:5 to obtain a carbon fiber bundle-graphene suspension. The height of the carbon fiber bundle-graphene suspension did not exceed the length of the carbon fiber bundles. A carbon fiber bundle-graphene thermal conductive material was formed by freeze-drying.

[0119] Comparative Example 3

[0120] Experimental procedure:

[0121] Under an external environment of 20-25 degrees Celsius, a temperature sensor is installed on the side of the treadmill motor to detect the change in internal temperature of the treadmill within 30 minutes of operation.

[0122] The test results are attached. Figure 4-6 As shown.

[0123] Comparative Example 1 and Comparative Examples 1-2, and in conjunction with the appendix Figure 4-6 It is known that adding carbon fiber bundle-graphene thermal conductive material as a thermal conductive material can significantly improve the heat dissipation effect of the motor, reducing the internal working temperature of the treadmill by more than 20%. In addition, after the carbon fiber bundles in the mixture are arranged in a multi-level orientation by a magnetic arrangement device, the heat dissipation performance of the material is even better, reducing the internal working temperature of the treadmill by more than 50%.

Claims

1. A magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material, comprising a frame, the frame including a base frame and a running board disposed above the base frame, and further including a running belt, a drive mechanism, and a handrail assembly, the drive mechanism including a drive motor, and a front roller and a rear roller fixed on the frame, the drive motor being drivenly connected to the front roller, and the running belt being drivenly connected to the front roller and the rear roller and wrapped around the running board; characterized in that: It also includes a limiting mechanism, which holds the running board at an inclined angle and allows it to move up and down elastically above the base frame. An adaptive magnetic levitation mechanism is provided between the base frame and the running board. The adaptive magnetic levitation mechanism applies an upward supporting and restoring force to the running board. It also includes a deformation detection unit, which detects the degree to which the running board is pressed down when used by different users. The adaptive magnetic levitation mechanism also adjusts the magnitude of the supporting and restoring force based on the data measured by the deformation detection unit. The running board is also equipped with initial position positioning devices on both sides to determine the user's initial standing position on the running board. A carbon fiber bundle-graphene thermal conductive material is disposed on the bottom of the drive motor. One end of the carbon fiber bundle-graphene thermal conductive material is attached to the bottom of the drive motor, and the other end is exposed on the bottom surface of the treadmill. The carbon fiber bundle-graphene thermal conductive material is prepared by a multi-level directional arrangement method of carbon fiber bundles. In the multi-level directional arrangement method of carbon fiber bundles, a magnetic attraction arrangement device is used to perform multi-level directional arrangement of carbon fiber bundles. The magnetic arrangement device includes several electromagnet units that can be telescopically connected. Each electromagnet unit forms a working area, and an outer container is placed on the working area. Its outer contour coincides with the outer edge of the working area, and each electromagnet unit is connected to an independent magnetic switch control system to form a multi-level magnetic arrangement area. Specifically, the magnetic attraction arrangement device includes a primary electromagnet unit, a secondary electromagnet unit, and a tertiary electromagnet unit. Each electromagnet unit forms a primary magnetic attraction arrangement area, a secondary magnetic attraction arrangement area, and a tertiary magnetic attraction arrangement area from the inside to the outside on the bottom surface of the container holding the mixed liquid. The primary electromagnet unit is telescopically connected to the secondary electromagnet unit, and the secondary electromagnet unit is telescopically connected to the tertiary electromagnet unit. The electromagnet unit includes a central electromagnet group, an inner circle electromagnet group, and an outer circle electromagnet group. The outer ring electromagnet assembly includes an outer ring iron core, which is a hollow structure. A first coil winding area is formed on the surface of the outer ring iron core. A first coil is wound inside the first coil winding area. A first shell is provided outside the first coil winding area. The inner ring electromagnet assembly includes an inner ring iron core, which is a hollow structure. A second coil winding area is formed on the surface of the inner ring iron core. A second coil is wound in the second coil winding area. A second housing is provided outside the second coil winding area. The second housing is slidably connected to the outer ring iron core through a first sliding component. The central electromagnet assembly includes a central iron core, a third coil winding area is formed on the surface of the central iron core, a third coil is wound in the third coil winding area, and a third housing is provided outside the third coil winding area; the third housing is slidably connected to the second housing through a second sliding component; the first coil, the second coil and the third coil are connected to the magnetic switch control system.

2. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 1, characterized in that: Side tubes are fixed on both sides of the running belt, including a left tube and a right tube. The limiting mechanism includes a buffer pad assembly between the front end of the left tube and the right tube and the base frame. A pivot fixing seat is provided between the rear end of the left tube and the right tube and the base frame.

3. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 2, characterized in that: The adaptive magnetic levitation mechanism includes a first levitation unit and a second levitation unit. The first levitation unit and the second levitation unit are respectively disposed between the base frame and the two sides of the running board. The first levitation unit and the second levitation unit have the same structure, each including a first electromagnet disposed on the base frame and a second electromagnet located directly above the first electromagnet and fixed on the side tube of the running board; and the first electromagnet and the second electromagnet are magnetically repelled. Both the first electromagnet and the second electromagnet are connected to a transformer power supply unit.

4. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 3, characterized in that: It includes five sets of variable voltages, with voltage values ​​U1, U2, U3, U4, and U5; and U1 < U2 < U3 < U4 < U5; the adaptive adjustment magnetic levitation mechanism also adjusts the magnitude of the support restoring force based on data measured by the deformation detection unit, including the following steps: Q1: Set the optimal downward pressure distance of the running board to S; Q2: The user determines their initial position on the running board using the initial position positioning device; Q3: Start the treadmill and apply a voltage of U3 to the adaptive magnetic levitation mechanism; Q4: The distance of N consecutive downward presses on the running board is measured by the deformation detection unit and denoted as: L1, L2...L N ; Q5: Calculate the average downward distance L3' of the running board = (L1 + L2...L...) N ) / N; Q6: Calculate the difference between the average downward distance L3' of the running board and the optimal downward distance S, and take the absolute value of the difference, denoted as E3=|L3'-S|. Q7: If the difference is negative, apply voltages U1 and U2 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average downward distance L1' and the optimal downward distance S of the running board when the voltage is U1, denoted as E1=|L1'-S|; and the absolute value of the difference between the average downward distance L2' and the optimal downward distance S of the running board when the voltage is U2, denoted as E2=|L2'-S|; take the minimum value among E1, E2, and E3, and use the voltage value applied to the adaptive magnetic levitation mechanism corresponding to the minimum value as the working voltage value; Q8: If the difference is positive, apply voltages U4 and U5 to the adaptive magnetic levitation mechanism in sequence; and according to steps Q4-Q6, obtain the absolute value of the difference between the average distance L4' of the running board pressing down and the optimal distance S of the running board pressing down when the voltage is U4, denoted as E4=|L4'-S|. And when the voltage value is U5, the absolute value of the difference between the average distance L5' of the running board pressing down and the optimal distance S of the running board pressing down is denoted as E5=|L5'-S|; take the minimum value among E5, E4 and E3, and use the adaptive adjustment magnetic levitation mechanism loading voltage value corresponding to the minimum value as the working voltage value.

5. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 2, characterized in that: The deformation detection unit is located on the side of the cushioning pad assembly and includes a laser emitter and a laser receiver positioned opposite each other. The laser emitter is fixedly connected to the bottom surface of the running board side tube, and the laser receiver is fixed to the base frame.

6. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 2, characterized in that: The initial positioning device consists of an infrared generator and an infrared receiver, which are respectively mounted on the frame and located on both sides of the running belt.

7. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 1, characterized in that: The carbon fiber bundle-graphene thermal conductive material is prepared by a multi-level oriented arrangement method of carbon fiber bundles, including the following steps: S1: Prepare carbon fiber bundles with magnetic attraction segments; S2: Preparation of graphene suspension; S3: Thoroughly mix the materials obtained in step S1 and step S2 to obtain a carbon fiber bundle-graphene suspension. S4: After the carbon fiber bundles in the mixture are arranged in a multi-level orientation using a magnetic attraction arrangement device, a carbon fiber bundle-graphene thermal conductive material is formed by freeze drying. S5: The top surface of the carbon fiber bundle-graphene thermal conductive material is cut and ground to form an arc surface that fits onto the bottom surface of the drive motor.

8. The magnetic levitation treadmill with high heat dissipation performance based on graphene heat dissipation material according to claim 7, characterized in that: The method for multi-level directional alignment of carbon fiber bundles includes the following sub-steps: S411: Activate the three-stage electromagnet unit for 5 seconds, apply a voltage of 12V, and form a magnetic force in the three-stage magnetic attraction arrangement area to attract the carbon fiber bundle to the three-stage magnetic attraction arrangement area on the bottom surface of the container. S412: Stir the mixture to cause the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the three-level magnetic attraction arrangement area on the bottom surface of the container; S413: The secondary electromagnet unit is raised to the same plane as the tertiary electromagnet unit and turned on for 4 seconds. A voltage of 14V is applied, and a magnetic force is formed in the secondary magnetic attraction arrangement area to attract the detached carbon fiber bundles to the secondary magnetic attraction arrangement area on the bottom surface of the container. S414: Stirring the mixture causes the carbon fiber bundles with insufficient magnetic attraction in the mixture to detach from the tertiary magnetic attraction arrangement area and the secondary arrangement area on the bottom surface of the container. S415: The primary electromagnet unit is raised to the same plane as the secondary electromagnet unit and turned on for 4 seconds. A voltage of 16V is applied. Magnetic force is formed in the primary magnetic attraction arrangement area to attract the detached carbon fiber bundles to the primary magnetic attraction arrangement area on the bottom surface of the container, thereby forming a uniformly arranged array of carbon fiber bundles.

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