Hydraulic lift cylinder and transport vehicle

Abstract

The embodiment of the present application provides a hydraulic lifting oil cylinder and a transport vehicle, the hydraulic lifting oil cylinder comprising: a cylinder sleeve assembly, the cylinder sleeve assembly comprising a cylinder sleeve base and a magnetic cylinder sleeve telescopically sleeved in the cylinder sleeve base and used for jacking a mine car body; a coil, the coil being arranged on the cylinder sleeve base along an axial direction of the magnetic cylinder sleeve; a power supply assembly, the power supply assembly being electrically connected with the coil; and a power feeding assembly, the power feeding assembly being connected in series in a loop of the coil, and the power feeding assembly being configured to transmit an induced current generated when the magnetic cylinder sleeve and the coil move relative to each other to an energy storage module of the vehicle. In the present application, the hydraulic lifting oil cylinder of the present patent adopts a magnetic-electric integrated design of a magnetic cylinder sleeve+coil+power supply assembly+power feeding assembly, an induced current is generated by relative movement of the magnetic cylinder sleeve and the coil, the gravitational potential energy of the falling magnetic cylinder sleeve can be converted into electric energy and recycled, and energy gain and utilization are improved.

Description

Technical Field

[0001] The embodiments of this application belong to the field of transportation vehicle technology, specifically relating to a hydraulic lifting cylinder and a transportation vehicle. Background Technology

[0002] With the development and progress of assisted driving or autonomous driving technologies, the requirements for the overall energy consumption of pure electric mining chassis vehicles are increasing.

[0003] Current mining trucks generally suffer from insufficient energy efficiency and inadequate functional protection when lifting large containers. When traveling on rough roads, the vibration energy of the lifting cylinder increases, and the lifting cylinder is prone to wear and tear under conditions of high impact acceleration and heavy-load unloading and lifting, resulting in a significant reduction in its lifespan.

[0004] Therefore, how to solve the above problems has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The embodiments of this application are intended to at least solve one of the technical problems existing in the prior art, and to provide a hydraulic lifting cylinder and a transport vehicle.

[0006] A first aspect of the embodiments of this application provides a hydraulic lifting cylinder, comprising: a cylinder liner assembly, the cylinder liner assembly including a cylinder liner base and a magnetic cylinder liner retractably sleeved within the cylinder liner base and used for lifting a mine car body;

[0007] A coil, the coil being wound around the cylinder liner base along the axial direction of the magnetic cylinder liner;

[0008] A power supply assembly, which is electrically connected to the coil;

[0009] A power supply assembly is connected in series in the circuit of the coil, and the power supply assembly is configured to transmit the induced current generated when the magnetic cylinder liner moves relative to the coil to the vehicle's energy storage module.

[0010] Furthermore, it also includes: a vehicle control unit, which is electrically connected to the upper stop switch and the lower stop switch of the mine car body respectively. The vehicle control unit generates a first control signal according to the triggering of the upper stop switch and the lower stop switch, and controls the current in the coil to be switched on and off according to the first control signal.

[0011] Furthermore, it also includes: a switching assembly disposed in the circuit between the coil and the power supply assembly and electrically connected to the vehicle control unit, the switching assembly being configured to control the on / off state of the circuit between the coil and the power supply assembly according to a first control signal from the vehicle control unit.

[0012] Optionally, the switching assembly is further configured to control the closure of the circuit between the coil and the power supply assembly when the vehicle control unit detects that the current remaining power of the energy storage module of the mining truck is less than a preset threshold and receives the first control signal triggered by the upper stop switch; and to control the disconnection of the circuit between the coil and the power supply assembly when the vehicle control unit detects that the current remaining power of the energy storage module of the mining truck is greater than the threshold.

[0013] Optionally, along the telescopic stroke of the magnetic cylinder liner within the cylinder liner base, the coil comprises multiple sub-coils wound at axial intervals along the cylinder liner base.

[0014] The switching assembly includes multiple control switches, each of which is connected in series with one of the sub-coil circuits. Each control switch is electrically connected to the vehicle control unit, and each control switch selectively controls the on / off state of the corresponding sub-coil circuit according to a first control signal from the vehicle control unit.

[0015] Optionally, the coil includes a flat copper coil formed by encapsulating it in epoxy resin on the inner peripheral wall of the cylinder liner base.

[0016] Optionally, along the telescopic stroke of the magnetic cylinder liner within the cylinder liner base, the coil is provided with 5-10 segments spaced upward along the axial direction of the cylinder liner base.

[0017] Optionally, each sub-coil is wound with 5-10 turns of copper wire.

[0018] Furthermore, the magnetic cylinder liner comprises a multi-stage magnetic cylinder liner nested sequentially, wherein one of the multi-stage magnetic cylinder liners is configured to be magnetized axially; or

[0019] The magnetic cylinder liner includes multiple nested magnetic cylinder liners, each of which is configured to be magnetized along the axial direction, and the magnetic poles of two adjacent magnetic cylinder liners are opposite at their opposite ends.

[0020] Furthermore, it also includes:

[0021] DC power supply;

[0022] The switching assembly is also used to electrically connect or disconnect the coil from the DC power supply.

[0023] Optionally, the power supply assembly includes a docking plug disposed on the outer periphery of the cylinder liner base and electrically connected to the lead wire of the coil, and a power supply wire plugged into the docking plug for transmitting the induced current of the coil.

[0024] A second aspect of the embodiments of this application provides a transport vehicle, comprising:

[0025] Vehicle body;

[0026] According to the hydraulic lifting cylinder described above, the hydraulic lifting cylinder is fixed to the vehicle body;

[0027] The box body has one end hinged to the vehicle body and the other end connected to the hydraulic lifting cylinder.

[0028] The beneficial effects of the embodiments of this application include:

[0029] In this application, the hydraulic lifting cylinder of this patent adopts a magneto-electric integrated design of magnetic cylinder liner + coil + power supply component + power feeding component. It utilizes the relative motion between the magnetic cylinder liner and the coil to generate induced current, which can convert the gravitational potential energy of the falling magnetic cylinder liner into electrical energy and recover it, thereby improving energy gain and utilization rate. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a hydraulic lifting cylinder according to an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the structure of a transport vehicle according to an embodiment of this application.

[0032] 100. Hydraulic lifting cylinder; 200. Housing; 300. Vehicle body; 1. Cylinder liner assembly;

[0033] 2. Coil; 3. Switch assembly; 4. Power supply assembly; 11. Cylinder liner base; 12. Magnetic cylinder liner; 21. Sub-coil; 31. Control switch; 41. Connecting plug; 42. Power supply wire. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The detailed descriptions and accompanying drawings of the following embodiments are used to exemplarily illustrate the principles of this application, but should not be used to limit the scope of this application; that is, this application is not limited to the described embodiments. In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range.

[0036] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application depending on the specific circumstances.

[0037] like Figure 1-2 As shown, a hydraulic lifting cylinder 100 includes a cylinder liner assembly 1, a coil 2, a power supply assembly, and a power supply assembly 4. The cylinder liner assembly 1 includes a cylinder liner base 11 and a magnetic cylinder liner 12 that is retractably sleeved within the cylinder liner base 1 and used for lifting the mine car body 200.

[0038] The coil 2 is wound around the cylinder liner base 11 along the axial direction of the magnetic cylinder liner 12, and the power supply assembly is electrically connected to the coil 2. The power supply assembly 4 is connected in series in the circuit of the coil 2, and the power supply assembly 4 is configured to transmit the induced current generated when the magnetic cylinder liner 12 and the coil 12 move relative to each other to the vehicle's energy storage module.

[0039] In this application, the hydraulic lifting cylinder 100 adopts a magneto-electric integrated design of magnetic cylinder liner 12 + coil 2 + power supply component + power supply component 4. The relative motion between the magnetic cylinder liner 12 and the coil 2 generates an induced current, which can convert the gravitational potential energy of the falling magnetic cylinder liner 12 into electrical energy and recover it, thereby improving energy gain and utilization rate.

[0040] In some embodiments, the hydraulic lifting cylinder 100 further includes a switching assembly 3 disposed in the circuit between the coil 2 and the power supply assembly and electrically connected to the vehicle control unit (VCU). The switching assembly 3 is configured to control the on / off state of the circuit between the coil 2 and the power supply assembly according to a first control signal from the vehicle control unit.

[0041] Specifically, the switch assembly 3 is connected in series with the circuit of the coil 2. The switch assembly 3 is configured to control the on / off state of the circuit of the coil 2 according to the first control signal, so that when the magnetic cylinder liner 12 moves relative to the coil 2, it generates induced current and electromagnetic resistance.

[0042] In this application, firstly, by utilizing the relative motion between the magnetic cylinder liner 12 and the coil 2 to generate an induced current, the gravitational potential energy of the falling magnetic cylinder liner 12 can be converted into electrical energy and recovered. Secondly, by controlling the on / off state of the coil 2 circuit through the regulating switch assembly 3, a dual braking guarantee of hydraulic and electromagnetic resistance is achieved, improving the anti-fall capability and significantly enhancing the working reliability under conditions of high impact acceleration, while reducing the wear and tear of the lifting cylinder and extending its service life. Thirdly, based on the self-heating characteristics of the coil 2, the problem of low-temperature viscosity of hydraulic oil in the hydraulic lifting cylinder 100 during winter use can be improved, enhancing environmental adaptability.

[0043] In some embodiments, a vehicle control unit is also included, which is electrically connected to the upper stop switch and the lower stop switch of the mine car body, respectively. The vehicle control unit generates a first control signal based on the triggering of the upper stop switch and the lower stop switch, and controls the current in the coil to be switched on or off based on the first control signal.

[0044] Specifically, the vehicle control unit generates the first control signal based on the triggering of the upper dead center switch, and controls the switch assembly 3 to close the coil 2 circuit based on the first control signal. Also, the vehicle control unit generates the first control signal based on the triggering of the lower dead center switch, and controls the switch assembly 3 to open the coil 2 circuit based on the first control signal.

[0045] In this application, when the mine car body reaches the top dead center, the vehicle control unit controls the coil 2 circuit to close via the switch assembly 3, so that the magnetic cylinder liner 12 magnetically cuts the coil 2 during its descent, generating electromagnetic damping and induced current. When the magnetic cylinder liner 12 reaches the bottom dead center, the vehicle control unit controls the coil 2 circuit to open via the switch assembly 3. That is, based on the above control method, this application achieves zero electromagnetic resistance during the lifting process of the car body 200, and recovers energy and provides electromagnetic damping through regenerated induced current during descent. This design significantly improves the impact resistance and energy utilization rate of the hydraulic cylinder, and is particularly suitable for new energy mining vehicles with frequent lifting operations.

[0046] In some embodiments, the switching component 3 is further configured to control the circuit of the coil 2 to close when the vehicle control unit detects that the current remaining power of the energy storage module of the mining truck is less than a preset threshold and receives the first control signal triggered by the upper stop switch. And, when the vehicle control unit receives that the current remaining power of the energy storage module of the mining truck is greater than the threshold, it controls the circuit of the coil 2 to open.

[0047] This embodiment achieves adaptive control of the energy recovery system by monitoring the energy storage module's power status through the vehicle control unit (VCU). Specifically, when the energy storage module's power level is detected to be below a preset threshold and the upper stop switch is triggered, the control coil 2 circuit closes to simultaneously regenerate induced current and recover energy during the descent, as well as generate electromagnetic damping. When the energy storage module has sufficient power, the vehicle control unit controls the coil 2 circuit to open via a switching assembly to avoid the risk of overcharging. This application employs an intelligent control strategy based on the energy storage module's power level, significantly improving the reliability and energy utilization efficiency of new energy mining trucks under complex operating conditions.

[0048] In some embodiments, along the retractable stroke of the magnetic cylinder liner 12 within the cylinder liner base 11, the coil 2 includes multiple sub-coils 21 wound at axial intervals along the cylinder liner base 11.

[0049] The switching assembly 3 includes multiple control switches 31, each of which is connected in series with a circuit of one of the sub-coil 21. Each control switch 31 is electrically connected to the vehicle control unit (VCU), and each control switch 31 controls the on / off state of its corresponding sub-coil 21 circuit according to a first control signal from the vehicle control unit. This embodiment employs a multi-segment sub-coil 21 design, with each segment of the sub-coil 21 circuit corresponding to a control switch 31 connected in series. This configuration enables precise control of energy recovery and electromagnetic damping of the hydraulic lifting cylinder 100.

[0050] Specifically, by arranging multiple independently controlled sub-coils 21 along the axial stroke of the magnetic cylinder liner 12, and coordinating with the vehicle control unit (VCU) to precisely regulate the circuits of each sub-coil 21, the corresponding sub-coil 21 can be activated according to the extension and retraction position of the magnetic cylinder liner, thereby improving energy recovery efficiency. Furthermore, by controlling the opening and closing of the segmented control coil 2 circuit, the braking force gradient can be controlled, making the descent process smoother and achieving precise adjustment of electromagnetic damping. Moreover, the multi-segment sub-coil 21 circuit design ensures that a failure in one sub-coil 21 does not affect other sub-coils 21; this redundancy design improves reliability. In summary, the design scheme provided in this application is applicable to multi-stage telescopic mining hydraulic cylinders, achieving optimized configuration of electromagnetic damping force and energy recovery efficiency while maintaining structural compactness.

[0051] In some embodiments, the coil 2 includes a flat copper coil, and the control switch 31 includes a solid-state relay.

[0052] In this application, the flat copper coil 2, based on its high fill factor, can achieve higher density packaging on the cylinder liner base 11, thereby increasing power density and effectively improving both energy recovery efficiency and electromagnetic damping efficiency. Furthermore, the flat cross-section of the flat copper coil 2 increases the heat dissipation area, forming an efficient heat conduction path with the cylinder's metal casing, effectively improving heat dissipation performance.

[0053] In some embodiments, the coil 2 includes a flat copper coil formed to be encapsulated in epoxy resin on the inner peripheral wall of the cylinder liner base 11.

[0054] In some embodiments, along the retractable stroke of the magnetic cylinder liner 12 within the cylinder liner base 11, the coil 2 is provided with 5-10 segments of coil 21 spaced upward along the axial direction of the cylinder liner base 11.

[0055] In some embodiments, each sub-coil 21 is wound with 5-10 turns of copper wire.

[0056] In one specific example, coil 2 is a flat copper coil with 50 turns of copper wire compacted and wound.

[0057] In one specific example, the coil is a flat copper coil with 100 turns of copper wire compacted and wound.

[0058] In one specific example, the coil 2 is a flat copper coil, which has 5 segments of coil 21 spaced upward along the axial direction of the cylinder liner base 11, and each segment of coil 21 is wound with 10 turns of copper wire.

[0059] In one specific example, the coil 2 is a flat copper coil, which has 10 segments of coil 21 spaced upward along the axial direction of the cylinder liner base 11, and each segment of coil 21 is wound with 5 turns of copper wire.

[0060] In one specific example, the coil 2 is a flat copper coil, which has 10 segments of coil 21 spaced upward along the axial direction of the cylinder liner base 11, and each segment of coil 21 is wound with 10 turns of copper wire.

[0061] Understandably, the specific settings of the coil are matched according to the power generation capacity and the required magnetic braking damping force.

[0062] In some embodiments, the magnetic cylinder liner 12 comprises a multi-stage magnetic cylinder liner nested sequentially, wherein one of the multi-stage magnetic cylinder liners is configured to be magnetized axially. It is understood that one or more magnetic cylinder liners can be magnetized as needed.

[0063] In some embodiments, the magnetic cylinder liner 12 includes multiple nested magnetic cylinder liners, each of which is configured to be magnetized along the axial direction, and the magnetic poles of two adjacent magnetic cylinder liners are opposite at their opposite ends.

[0064] In some embodiments, the hydraulic lifting cylinder 100 also includes a DC power supply, and the switching assembly is further used to electrically connect or disconnect the coil 2 from the DC power supply.

[0065] Specifically, the DC power supply is selectively electrically connected to the coil 2 via the switching assembly 3. Specifically, the DC power supply is a DC 25V power supply.

[0066] The switch assembly 3 is further configured to electrically connect the coil 2 to the DC power supply according to the second control signal of the vehicle control unit, so that the coil 2 heats and regulates the oil temperature in the cylinder liner base 11.

[0067] In this application, by introducing the heating function of DC power supply, the low-temperature adaptability of hydraulic lifting cylinder 100 can be significantly improved.

[0068] In some embodiments, the power supply assembly 4 includes a docking plug 41 disposed on the outer periphery of the cylinder liner base 11 and electrically connected to the lead wire of the coil 2, and a power supply wire 42 plugged into the docking plug 41 and used to transmit the induced current of the coil 2.

[0069] In some embodiments, the hydraulic lifting cylinder 100 further includes a primary recovery cylinder 124 coaxial with and nested inside the cylinder liner base 11, wherein the coil 2 is circumferentially embedded in the inner peripheral wall of the cylinder liner base 11.

[0070] In some embodiments, the flat copper coil 2 is formed by encapsulating it in the inner peripheral wall of the primary cylinder liner base 11 with epoxy resin insulating varnish.

[0071] In some embodiments, the magnetic cylinder liner 12 includes a primary magnet sleeve 121, a secondary magnet sleeve 122, and a tertiary magnet sleeve 123, which are coaxial with the cylinder liner base 11 and sequentially sleeved on each other. The magnetic cylinder liner 12 also includes a secondary recovery cylinder 125, which is coaxially arranged with the primary magnet sleeve 121 and sleeved on the primary recovery cylinder 124, and a tertiary recovery cylinder 126, which is coaxially arranged with the secondary magnet sleeve 122 and sleeved on the secondary recovery cylinder 125.

[0072] In some embodiments, the hydraulic lifting cylinder 100 of this application is applied to unmanned pure electric mining vehicles.

[0073] In this application, the logic of unmanned pure electric mining truck after heavy-load lifting and unloading is utilized. Normally, the lifting hydraulic cylinder will unload and return oil to fall into the housing 200. Relying on the weight of the housing 200, the hydraulic cylinder unloads and returns oil to recover the multi-stage magnetic cylinder liner. All multi-stage magnetic cylinder liners are made of permanent magnet material. Under the action of gravitational potential energy, the multi-stage magnetic cylinder liner of the hydraulic cylinder falls during its idle stroke. The flat copper coil lining the cylinder liner base 11 (internal embedding) is used to regenerate induced current and generate magnetic damping by cutting magnetic lines of force according to Lenz's law. Furthermore, applying direct current to the coil 2 body can preheat it, thereby improving the problem of low-temperature viscosity and sluggishness of the hydraulic oil in the hydraulic lifting cylinder 100 under winter working conditions.

[0074] Specifically, the inner bushing of the cylinder liner base 11 of the hydraulic lifting cylinder is designed as a high-density, heat-resistant H-class flat copper coil 2 fully encapsulated with epoxy resin insulating varnish. Waterproof connectors 41 are designed at both axial ends of the cylinder liner base 11 for connecting the power supply cable.

[0075] In a specific example, the flat copper coil 2 is set to 50 or 100 turns depending on the compaction density. It is understood that the compaction density of the flat copper coil includes, but is not limited to, 50 or 100 turns, and is set according to actual needs.

[0076] In another specific example, the flat copper coil 2 is divided into 10 sub-coils 21. It can be understood that the specific setting method and number of the flat copper coil 2 are matched according to the power generation and magnetic braking damping force requirements.

[0077] In a specific example, when the lower stop switch is triggered and the hydraulic lifting cylinder 100 lifts the box 200, the hydraulic cylinder extends a multi-stage magnetic cylinder sleeve during the lifting stroke. Each magnetic sleeve does not generate magnetic damping or cut magnetic lines of force to generate electricity and store energy with the flat copper coil 2 inside the cylinder sleeve base 11.

[0078] In another specific example, the vehicle control unit controls a corresponding solid-state relay to open or close the circuit of the flat copper coil 2. In this application, solid-state relays are selected because they have long contact lifespan and are not easily damaged by sticking. Furthermore, through opening and closing control, unnecessary magnetic damping and regenerative current during the lifting of the vehicle body 200mm are eliminated. Specifically, the vehicle control unit controls the opening or closing of coil 2 via the solid-state relay based on the trigger signal at the top dead center or bottom dead center.

[0079] In one example, when the hydraulic cylinder needs to lower the vehicle body 200 after lifting it, the top dead center is triggered, and the vehicle control unit controls the multiple solid-state relays corresponding to the flat copper coil 2 of the cylinder liner base 11 of the hydraulic cylinder to close their internal contacts.

[0080] Furthermore, when the vehicle body 200 falls, each stage of the multi-stage magnetic cylinder liner 12 unloads the oil pressure and simultaneously generates magnetic damping, thus providing a step-by-step safety protection. Furthermore, the flat copper coil 2 inside the cylinder liner base 11 generates induced current by cutting the magnetic lines of force with each stage of the magnetic cylinder liner.

[0081] Specifically, the vehicle control unit controls the closing or opening of coil 2 circuit based on the current remaining charge percentage (SOC) of the power storage module in the vehicle's battery management system (BMS). In one specific example, the vehicle control unit controls coil 2 circuit to open when the current remaining charge percentage (SOC) of the power storage module is greater than 98%, thus disabling the energy storage function; conversely, the vehicle control unit controls coil 2 circuit to close when the current remaining charge percentage (SOC) of the power storage module is less than 98%, thus enabling the energy storage function. Based on the aforementioned charge status, this application selectively determines whether to supply regenerated electrical energy to the on-board energy storage system, thereby achieving the additional energy storage function of the energy storage module and improving energy gain and utilization.

[0082] In this application, an embedded flat copper coil 2 is used within the cylinder liner base 11, and the flat copper coil 2 is electrically connected to a DC power supply. Under the harsh winter conditions in the mining area, a certain proportion of DC current can be applied to cause the flat copper coil 2 to self-heat, thereby regulating the oil temperature in the hydraulic cylinder. In addition, the frequent reciprocating motion of the lifting hydraulic cylinder can quickly circulate the oil tank, making the low-temperature viscous hydraulic oil less viscous.

[0083] In summary, to increase the damping of the hydraulic cylinder retraction during the descent of the lifting box 200, and to improve the overall energy storage efficiency of the vehicle, this application utilizes the inner flat copper coil 2 in the bottom cylinder liner base 11 to perform magnetic line cutting with the magnetic cylinder liner 12 during the descent of the hydraulic lifting cylinder from the lifting box 200, thereby achieving regenerative energy storage and magnetic damping braking. The energy storage of the flat copper coil 2 and the magnetic damping braking apply the principle of Lenz's law, "rejecting incoming forces and retaining outgoing forces" (the magnetic field of the induced current always opposes the change in the magnetic field of the permanent magnet cylinder liner).

[0084] The beneficial effects of this application include: 1. The design of a multi-stage magnetic cylinder liner 12 + cylinder liner base 11 + flat copper coil 2 scheme realizes regenerative induced current energy storage and electromagnetic damping braking, thereby achieving the function of additional energy storage and improving energy gain and utilization rate.

[0085] 2. The flat copper coil 2 set on the cylinder liner base 11 is divided into several segments of coil 21, and a solid-state relay is connected in series accordingly. The vehicle control unit selectively controls the closing and opening of the internal contacts of the solid-state relay according to the triggering of the top dead center or the bottom dead center. This setting method enables the magnetic cylinder liner 12 to selectively cut the magnetic lines of force with the flat copper coil 2 on the cylinder liner base 11 when the magnetic steel sleeves of each stage extend and fall, thus realizing selective control of energy storage and electromagnetic damping.

[0086] 3. By passing a direct current through coil 2, the coil 2 is made to heat up, thereby regulating the oil temperature in the hydraulic cylinder. When the hydraulic oil is viscous at low temperature, it becomes less viscous, ensuring the optimal state of the oil in the lifting hydraulic cylinder and thus ensuring operational reliability.

[0087] refer to Figure 2 A second aspect of the embodiments of this application provides a transport vehicle, including a vehicle body, the aforementioned hydraulic lifting cylinder 100, and a housing 200. The hydraulic lifting cylinder 100 is fixed to the vehicle body 300, and one end of the housing 200 is hinged to the vehicle body 300, while the other end is throttle-connected to the hydraulic lifting cylinder 100.

[0088] In some embodiments, the vehicle control unit is configured to control the on / off state of the coil 2 circuit of the hydraulic lifting cylinder 100, so that induced current and electromagnetic resistance are generated when the magnetic cylinder liner 12 moves relative to the coil 2.

[0089] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this application, and this application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this application, and these modifications and improvements are also considered to be within the scope of protection of this application.

Claims

1. A hydraulic lifting cylinder, characterized in that, include: A cylinder liner assembly, the cylinder liner assembly including a cylinder liner base and a magnetic cylinder liner that is telescopically sleeved in the cylinder liner base and used to lift the mine car body; A coil, the coil being wound around the cylinder liner base along the axial direction of the magnetic cylinder liner; A power supply assembly, which is electrically connected to the coil; A power supply assembly is connected in series in the circuit of the coil, and the power supply assembly is configured to transmit the induced current generated when the magnetic cylinder liner moves relative to the coil to the vehicle's energy storage module.

2. The hydraulic lifting cylinder according to claim 1, characterized in that, Also includes: The vehicle control unit is electrically connected to the upper stop switch and the lower stop switch of the mine car body. The vehicle control unit generates a first control signal according to the triggering of the upper stop switch and the lower stop switch, and controls the current in the coil to switch on and off according to the first control signal.

3. The hydraulic lifting cylinder according to claim 2, characterized in that, Also includes: A switching assembly is disposed in a circuit between the coil and the power supply assembly and is electrically connected to the vehicle control unit. The switching assembly is configured to control the opening and closing of the circuit between the coil and the power supply assembly according to a first control signal from the vehicle control unit.

4. The hydraulic lifting cylinder according to claim 3, characterized in that, The switching assembly is further configured to control the closure of the circuit between the coil and the power supply assembly when the vehicle control unit detects that the current remaining power of the mining truck's energy storage module is less than a preset threshold and receives the first control signal triggered by the upper stop switch. Furthermore, when the vehicle control unit detects that the remaining power of the mining truck's energy storage module is greater than the threshold, it controls the circuit between the coil and the power supply component to be disconnected.

5. The hydraulic lifting cylinder according to claim 3 or 4, characterized in that, Along the telescopic stroke of the magnetic cylinder liner within the cylinder liner base, the coil comprises multiple segments of coil wound at intervals along the axial direction of the cylinder liner base; The switching assembly includes multiple control switches, each of which is connected in series with one of the sub-coil circuits. Each control switch is electrically connected to the vehicle control unit, and each control switch selectively controls the on / off state of the corresponding sub-coil circuit according to a first control signal from the vehicle control unit.

6. The hydraulic lifting cylinder according to any one of claims 1 to 3, characterized in that, The coil includes a flat copper coil, which is formed by encapsulating it in epoxy resin on the inner peripheral wall of the cylinder liner base.

7. The hydraulic lifting cylinder according to any one of claims 1 to 3, characterized in that, The magnetic cylinder liner comprises a multi-stage magnetic cylinder liner nested sequentially, wherein one of the multi-stage magnetic cylinder liners is configured to be magnetized axially; or The magnetic cylinder liner includes multiple nested magnetic cylinder liners, each of which is configured to be magnetized along the axial direction, and the magnetic poles of two adjacent magnetic cylinder liners are opposite at their opposite ends.

8. The hydraulic lifting cylinder according to claim 3 or 4, characterized in that, Also includes: DC power supply; The switching assembly is also used to electrically connect or disconnect the coil from the DC power supply.

9. The hydraulic lifting cylinder according to any one of claims 1 to 3, characterized in that, The power supply assembly includes a docking plug disposed on the outer periphery of the cylinder liner base and electrically connected to the lead wire of the coil, and a power supply wire inserted into the docking plug and used to transmit the induced current of the coil.

10. A transport vehicle, characterized in that, include: Vehicle body; The hydraulic lifting cylinder according to any one of claims 1-9 is fixed to the vehicle body; The box body has one end hinged to the vehicle body and the other end connected to the hydraulic lifting cylinder.

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