Hydraulic device for mine car

Abstract

A hydraulic device for a mine car comprises an oil tank, the top of the oil tank is connected with an overflow valve and a reversing valve, one side of the oil tank is connected with a filter tank, the top of the filter tank is connected with a first electromagnetic valve, the overflow valve and the reversing valve are connected to the first electromagnetic valve through pipelines, and the bottom of the filter tank is connected with a second electromagnetic valve. The second solenoid valve is connected with the oil tank through a return pipe, and one end of the return pipe arranged in the filter tank is connected with a filter assembly. An independent filter box is arranged, circulating oil liquid is subjected to real-time impurity removal treatment through a built-in filter assembly, on one hand, a certain oil liquid overflowing amount is reserved through an outer filter screen, impurities are isolated outside the outer filter screen, and on the other hand, metal impurities in the oil liquid are adsorbed to an inner cover cylinder through a magnetic bar; the filter assembly can be cleaned regularly, and the scraping ring and the scraping strip are controlled by the electric push rod to rotate and retreat to scrape attached impurities.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic devices, and particularly to a hydraulic device for a mining truck. Background Art

[0002] The hydraulic device on a mining truck is mainly used to achieve functions such as braking, steering, self-unloading or auxiliary operations. Its structure and working principle need to adapt to the harsh environment of the mine (high load, vibration, dust, etc.), including power components, actuating components, control components, auxiliary components and working medium. The engine drives the hydraulic pump to rotate, sucks in the oil fluid from the fuel tank and pressurizes and outputs it. The high-pressure oil fluid is distributed by the control valve, pushing the piston of the hydraulic cylinder to move. The actuating component converts hydraulic energy into mechanical energy to complete actions such as lifting the car body and steering assist. The low-pressure oil fluid returns to the fuel tank after filtration and cooling, forming a closed loop.

[0003] When the hydraulic device is applied under the working conditions of a mining truck, impurities will gradually accumulate in the hydraulic oil. The sources of impurities are, firstly, external. The working environment of the mining truck is usually very harsh, with high dust, heavy load and large vibration. Dust may enter the system through the breather of the fuel tank or the seal of the hydraulic cylinder. The operation site of the mining truck is dusty. If the fuel tank does not have a good air filter, dust will be brought in every time it breathes. Then there are the pollutants generated internally. The hydraulic components will wear during operation. For example, the metal friction of pumps, valves and oil cylinders will generate metal particles, and the oil fluid will oxidize at high temperature to form gums and sludge, which are also pollutants.

[0004] The impurities in the oil fluid have many adverse consequences: particulate matter will scratch the precision mating surfaces; impurities block the filter, causing air suction or the failure of the overflow valve, resulting in out-of-control braking or lifting of the mining truck; gums or metal chips block the clearance of the spool valve, resulting in malfunction.

[0005] Currently, a high-efficiency air filter is installed at the breather of the fuel tank for the hydraulic device, and at the same time, a filter element is added in the fuel tank to adsorb impurities. However, the current method of only filtering the circulating oil fluid in the fuel tank still leaves the filtered impurities in the fuel tank and does not completely remove them. The blockage of the filter will lead to an increase in back pressure. At present, to remove impurities, the filter in the fuel tank needs to be taken out, which is inconvenient to operate, and at the same time, the oil fluid will be replaced, making the overall hydraulic device unable to always be in the best working state. Summary of the Invention

[0006] In view of the problems raised in the background art, the present invention provides a hydraulic device for a mining truck to solve them, and the following further elaborates on the present invention.

[0007] A hydraulic device for a mine car, comprising an oil tank, an overflow valve and a reversing valve are connected to the top of the oil tank, the overflow valve and the reversing valve are communicated, the reversing valve is communicated with the oil tank, a filter tank is connected to one side of the oil tank, a first solenoid valve is connected to the top of the filter tank, the overflow valve and the reversing valve are both connected to the first solenoid valve through pipelines, a second solenoid valve is connected to the bottom of the filter tank, the second solenoid valve is connected to the oil tank through a return pipe, and a filtering component is connected to one end of the return pipe placed inside the filter tank.

[0008] Further, a cooling fan is provided on the oil tank, and the return pipe is in the forced convection formed by the cooling fan. The oil temperature is controlled within the ideal working temperature range through the cooling effect on the return pipe.

[0009] Further, the filtering component includes an outer filter screen connected to the end of the return pipe, the outer filter screen is densely provided with filter holes, an inner cover cylinder connected to the outer filter screen is arranged inside the outer filter screen, and a magnetic rod is arranged inside the inner cover cylinder, and the magnetic rod generates a stable magnetic field. The outer filter screen can isolate impurities outside the outer filter screen, the oil fluid can enter the outer filter screen through the filter holes, and the metal impurities in the oil fluid are adsorbed on the inner cover cylinder.

[0010] Further, a scraping component is further included, including a screw rod movably penetrating through the filter tank, one end of the screw rod inside the filter tank is connected with an end cover, the ends of the outer filter screen and the inner cover cylinder different from the return pipe are open, and the magnetic rod is connected to the end cover; scraping rings are arranged on the inner and outer walls of the outer filter screen and the outer wall of the inner cover cylinder, the scraping rings are connected to the end cover through scraping strips, and the screw rod is controlled to be pulled out of the filter tank. During the process that the screw rod is controlled to be pulled out of the filter tank, the scraping rings attached to the outer walls of the outer filter screen and the inner cover cylinder are linked to scrape the impurities attached to the surfaces of the two.

[0011] Further, a threaded section is provided on the screw rod, and the threaded section is in threaded cooperation with the filter tank when penetrating through the filter tank; one end of the screw rod outside the filter tank is rotatably connected with a connecting ear, the filter tank is connected with a second bracket, an electric push rod is connected to the second bracket, and the output end of the electric push rod is connected to the connecting ear. The electric push rod pulls the screw rod to move outwards, the outward moving screw rod rotates by itself through the threaded cooperation with the filter tank, thereby driving the scraping rings and the scraping strips to rotate, and the scraping strips pre-scrape the inner and outer walls of the outer filter screen and the outer wall of the inner cover cylinder.

[0012] Further, the bottom of the filtration tank is connected to the waste liquid tank through a third solenoid valve. A partition is fixedly connected inside the filtration tank. The partition is rotatably connected to a flap through a rotating shaft, and one end of the rotating shaft extends outside the filtration tank and is connected to a wrench. By rotating the wrench, the flap can be rotated. The flap and the partition divide the inner cavity of the filtration tank into an upper cavity and a lower cavity. When the filtration component needs to be cleaned, the upper cavity and the lower cavity are not connected, and the scraped impurities are deposited in the lower cavity. The oil liquid in the lower cavity will carry the impurities and flow to the waste liquid tank. After the oil liquid in the lower cavity is discharged, the upper cavity and the lower cavity are connected, and the oil liquid in the upper cavity will flush downward to clean the filtration component and the inner wall of the lower cavity, flushing away the remaining impurities.

[0013] Further, the output end of the electric push rod is connected to a second connecting ear, and pin holes are provided on the connecting ear and the second connecting ear; a slide rail is connected between the second bracket and the outer wall of the filtration tank, and a moving frame is slidably provided on the slide rail. A rack is provided on the moving frame. First gears are rotatably provided on both the second bracket and the outer wall of the filtration tank. The two first gears are key-connected to the second rotating shaft, and a second gear is key-connected to the rotating shaft. The second gear meshes with the first gear; a chute is provided at the bottom of the moving frame, a guide rod is provided in the chute, a slider is provided in the chute, the guide rod passes through the slider, a pin shaft is connected to the slider, and a spring is sleeved on the guide rod. When the wrench is pulled to rotate the flap to a state flush with the partition, the screw rod is also linked to the output end of the electric push rod, otherwise the action of the electric push rod cannot be transmitted to the screw rod.

[0014] Further, a housing is connected to the outer wall of the filtration tank. The wrench is located outside the housing, and the electric push rod, the second connecting ear, the second bracket, the slide rail, the moving frame, the rack, the first gear, the second rotating shaft, the second gear, the guide rod, the slider, the pin shaft, and the spring are all disposed inside the housing. It is intended to isolate and protect each meshing moving part in the harsh environment of the mining area where the mine car works.

[0015] Further, a ring groove is provided on the bottom wall of the filtration tank, a scraping member is provided on the ring groove, there is a section of the ring groove that penetrates the bottom wall of the filtration tank, a section of ring teeth is provided at the bottom of the scraping member, and the ring teeth are exposed outside the bottom wall of the hollow filtration tank. The scraping member is attached to the inner bottom wall of the hollow filtration tank; a motor is connected to the outer bottom wall of the hollow filtration tank, and a rotating tooth is connected to the output end of the motor. The rotating tooth meshes with the ring teeth. When the inner bottom wall of the filtration tank needs to be cleaned, the motor drives the rotating tooth to rotate reciprocally, and then drives the scraping member to rotate reciprocally in the ring groove by meshing with the ring teeth. The rotating scraping member performs a scraping operation on the inner bottom wall of the filtration tank.

[0016] Further, a fixed ring is connected to the bottom of the filtration tank. The middle of the fixed ring is a circular groove. The fixed ring is rotatably connected to a rotating blade through a plurality of positioning bolts. The rotating blade is also rotatably connected to the scraping member through a rotatably connected connecting rod. The rotating blade closes completely to seal the circular groove in the middle of the fixed ring, ensuring the sealing of the oil liquid circulation during operation.

[0017] Beneficial effects: Compared with the prior art, the present invention is suitable for mine cars in harsh working conditions, and performs impurity removal treatment on the oil circulation of the mine car. It is provided with an independent filter box, and the circulating oil is subjected to real-time impurity removal treatment through the built-in filter component. On the one hand, a certain oil flow rate is retained through the outer filter screen, and impurities are isolated outside the outer filter screen. On the other hand, metal impurities in the oil are adsorbed on the inner cover cylinder by the magnetic rod; the present invention can regularly clean the filter component, control the scraping ring and scraping strip to rotate and retreat through the electric push rod, and scrape off the attached impurities; the present invention also discharges the oil in the filter box in stages through the setting of the rotating plate. The oil with a high impurity content in the initial stage is treated as waste liquid, and the flushing oil in the second stage can be recycled, and at the same time, the impurities remaining in the first stage can be washed out; the present invention also has an anti-mistake operation. When the wrench is pulled to make the flap rotate to the same level as the partition board, the screw rod is also linked to the output end of the electric push rod, otherwise the action of the electric push rod cannot be transmitted to the screw rod. Description of the Drawings

[0018] Figure 1 : Structural schematic diagram of the hydraulic device used in the mine car of the present invention; Figure 2 : Internal structural schematic diagram of the filter box; Figure 3 : Structural schematic diagram of the filter component; Figure 4 : Figure 2 Enlarged schematic diagram of the structure at A in ; Figure 5 : Structural schematic diagram of the filter component and the scraping component; Figure 6 : Structural schematic diagram of the scraping part; In the figure: first bracket 1, fuel tank 2, overflow valve 3, reversing valve 4, filter box 5, first solenoid valve 6, second solenoid valve 7, return pipe 8, cooling fan 9, outer filter screen 10, inner cover cylinder 11, magnetic rod 12, screw rod 13, end cover 14, scraping ring 15, scraping strip 16, connecting ear 17, second bracket 18, electric push rod 19, third solenoid valve 20, partition board 21, rotating shaft 22, flap 23, wrench 24, second connecting ear 25, slide rail 26, moving frame 27, rack 28, first gear 29, second rotating shaft 30, second gear 31, guide rod 32, slider 33, pin shaft 34, spring 35, housing 36, scraping part 37, ring teeth 38, motor 39, rotating teeth 40, fixed ring 41, positioning bolt 42, rotating blade 43, connecting rod 44, waste liquid tank 45. Detailed Description of the Invention

[0019] Next, a specific embodiment of the present invention will be elaborated in detail with reference to the attached Figures 1-6 drawings.

[0020] Refer to the attached Figure 1, A hydraulic device for a mine car, which is fixedly connected to the mine car through a first bracket 1. An integral hydraulic device is installed on the first bracket 1, including an oil tank 2. The oil tank 2 stores the medium oil for work. Generally, the oil tank is internally provided with a partition plate, an oil suction filter and a liquid level gauge. The partition plate can separate the oil return area and the oil suction area, promote the escape of air bubbles and the precipitation of impurities. The oil suction filter has a lower mesh number and plays a role of coarse filtration to prevent large particle impurities from entering the pump. The oil in the oil tank is pumped to the inlet of the hydraulic pump through the oil suction filter.

[0021] An overflow valve 3 and a directional control valve 4 are connected to the top of the oil tank 2. The overflow valve 3 and the directional control valve 4 are communicated, and the directional control valve 4 is communicated with the oil tank 2. The overflow valve is a pressure control element. By adjusting the opening and closing of the valve port, the excess oil is led back to the oil tank, thereby controlling the system pressure, used to limit the maximum system pressure, protect other components from overload damage, and at the same time have functions such as pressure stabilization or unloading. The directional control valve 4 is used as a direction control valve to switch the oil circuit. In this embodiment, taking the lifting of a dump truck bucket as an example: when lifting, the directional control valve conducts the P-A port, and the high-pressure oil enters the rodless cavity of the hydraulic cylinder, the piston rod extends, and the bucket is lifted; when descending, the directional control valve conducts the B-T port, and the oil in the rod chamber of the hydraulic cylinder returns to the oil tank through the oil return circuit.

[0022] The above are all prior arts. It can be seen that in the prior art, the overflow valve 3 is designed to lead the excess oil back to the oil tank, and the directional control valve 4 is designed to direct the oil to the actuator through commutation and return the oil to the oil tank through the oil return circuit. The oil suction filter is installed in the oil tank 2 to filter impurities and prevent impurities from entering the circulating oil circuit. However, as mentioned in the background art, the pollutants generated inside the system include metal particles generated by the wear of hydraulic components during operation. The particles will scratch the precision mating surface and block the spool clearance, resulting in malfunction. At present, the mesh number of the oil suction filter in the oil tank is relatively low and only plays a role of coarse filtration, and cannot filter metal particle impurities.

[0023] A filter tank 5 is connected to one side of the oil tank 2. A first solenoid valve 6 is connected to the top of the filter tank 5. The overflow valve 3 and the directional control valve 4 are both connected to the first solenoid valve 6 through pipelines. The excess oil at the overflow valve 3 and the oil flowing back to the oil tank at the directional control valve 4 are first diverted to the filter tank 5 for filtration treatment. A second solenoid valve 7 is connected to the bottom of the filter tank 5. The second solenoid valve 7 is connected to the oil tank 2 through a return pipe 8 to return the filtered oil to the oil tank 2.

[0024] A large amount of heat will be generated during the continuous operation of the hydraulic device under high pressure and high load. Excessive oil temperature will cause a series of chain reactions, directly affecting the system performance, component life and operation safety. In this embodiment, a cooling fan 9 is provided on the oil tank 2, and forced convection is formed by the cooling fan 9 to control the oil temperature within the ideal working temperature range of 40~65°C through the cooling effect on the return pipe 8.

[0025] Refer to the appendixFigure 2 、 3 and 5, one end of the return pipe 8 built inside the filter tank 5 is connected with a filtering component. The filtering component includes an outer filter screen 10 clamped at the end of the return pipe 8. The outer filter screen 10 is densely covered with filtering holes, which can isolate impurities outside the outer filter screen. The oil fluid can enter the outer filter screen through the filtering holes and be pumped back to the fuel tank by the return pipe. To prevent excessive back pressure, the aperture of the filtering holes on the filter screen is relatively large, but metal particles will also enter the outer filter screen. An inner cover cylinder 11 connected thereto is arranged inside the outer filter screen 10, and a magnetic rod 12 is arranged inside the inner cover cylinder 11. The magnetic rod generates a stable magnetic field to adsorb metal impurities (generally iron) in the oil fluid on the inner cover cylinder 11. The inner cover cylinder is made of non-magnetic material.

[0026] With the accumulation of service time, an impurity layer will adhere to the surfaces of the outer filter screen 10 and the inner cover cylinder 11, which will block the filtering holes of the outer filter screen and affect the oil fluid flow rate. The metal layer adsorbed on the surface of the inner cover cylinder 11 will also weaken the magnetic field, thereby affecting the adsorption capacity for metal impurities. In this embodiment, a scraping component is used to periodically remove impurities from the filtering component, including a screw rod 13 movably penetrating through the filter tank 5. One end of the screw rod 13 inside the filter tank 5 is connected with an end cover 14. The ends of the outer filter screen and the inner cover cylinder different from the return pipe 8 are open. During filtration, the end cover 14 presses on the open ends to seal the outer filter screen and the inner cover cylinder. The magnetic rod 12 is connected to the end cover 14; scraping rings 15 are arranged on the inner and outer walls of the outer filter screen 10 and the outer wall of the inner cover cylinder 11. The scraping rings 15 are connected to the end cover 14 through scraping strips 16, and the screw rod 13 is controlled to be pulled out of the filter tank 5.

[0027] During the process that the screw rod 13 is controlled to be pulled out of the filter tank 5, the scraping rings 15 that are in contact with the outer wall of the outer filter screen 10 and the inner cover cylinder 11 are linked to scrape the impurities adhering to their surfaces. It should be noted that the impurities adhering to the surface of the outer filter screen 10 are scraped off and gradually deposited at the bottom of the filter tank 5, but the impurities adhering to the surface of the inner cover cylinder 11 are scraped off and gradually deposited on the inner surface of the outer filter screen 10. At this time, the scraping ring in contact with the inner surface of the outer filter screen 10 can push the metal impurities out from the open end and also deposit them at the bottom of the filter tank 5. During the process that the end cover 14 retracts with the screw rod 13, the magnetic rod 12 retracts accordingly, and the impurities adhering to the surface of the inner cover cylinder 11 lose the magnetic attraction force and are more easily scraped off.

[0028] Refer to the appendix Figures 2-5In order to improve the scraping effect, the scraper strip 16 can also scrape the inner and outer walls of the outer filter screen 10 and the outer wall of the inner cover tube 11 in this embodiment. Specifically, the screw rod 13 is provided with a threaded section, which is threadedly matched with the filter box 5 when penetrating the filter box 5; the screw rod 13 is rotatably connected with a connecting ear 17 at one end outside the filter box 5, and the filter box 5 is connected with a second bracket 18, and the second bracket 18 is connected with an electric push rod 19, and the output end of the electric push rod 18 is connected with the connecting ear 17. After the electric push rod 19 is actuated, it pulls the screw rod 13 outward. Based on the rotational connection between the screw rod 13 and the connecting ear 17, the outward-moving screw rod 13 rotates by threading with the filter box 5, thereby driving the scraper ring 15 and the scraper strip 16 to rotate, and the scraper strip pre-scrapes the inner and outer walls of the outer filter screen 10 and the outer wall of the inner cover tube 11.

[0029] The oil level in the filter box 5 is at a high level. When scraping and cleaning the filter assembly, the first solenoid valve 6 and the second solenoid valve 7 need to be closed in advance to isolate the filter box 5 from the hydraulic system. A constant pressure valve is connected to the top of the filter box 5. Under actual working conditions, when cleaning the filter assembly inside the filter box 5, the scraped impurities and all the oil inside need to be discharged. At this time, the amount of oil discharged is large, and the loss is large. At the same time, the impurities in the filter box 5 cannot be guaranteed to be removed at one time.

[0030] In this embodiment, the oil in the filter box 5 is discharged in stages. Specifically: the bottom of the filter box 5 is connected to the waste liquid tank 45 through the third solenoid valve 20, and a partition 21 is fixedly connected to the filter box 5. The partition 21 is rotatably connected to a flap 23 through a rotating shaft 22. One end of the rotating shaft 22 extends to the outside of the filter box 5 and is connected to a wrench 24. By rotating the wrench 24, the flap 23 can be rotated to achieve the separation or connection of the internal space of the filter box 5. The wrench 24 has two locking positions, and the locking and positioning can be achieved by a positioning pin. This is a conventional technical means and will not be elaborated in detail.

[0031] When the filter assembly needs to be cleaned, the flap 22 is first controlled to rotate to the same level as the partition 20, so that the inner cavity of the filter box 5 is divided into an upper cavity and a lower cavity that are not connected; then the electric push rod 19 is linked to scrape the filter assembly, and the scraped impurities are deposited in the lower cavity, and then the third solenoid valve 20 is opened, and the oil in the lower cavity will carry the impurities to the waste liquid tank 45; after the oil in the lower cavity is discharged, the flap 22 is rotated and reset, and the upper cavity and the lower cavity in the filter box 5 are connected, and the oil in the upper cavity will flush downward to clean the filter assembly and the inner wall of the lower cavity, and flush away the residual impurities. At this time, the impurity content of the flushed oil is low and can be recycled and processed separately.

[0032] In this embodiment, the oil in the filter box 5 is discharged in stages. It is necessary to ensure that before cleaning the filter component, the flap 22 has rotated to the same horizontal state as the partition 20. This embodiment achieves an anti-mistake effect through the following technical solutions: the output end of the electric push rod 18 is connected with a second connecting ear 25, and pin holes are provided on the connecting ear 17 and the second connecting ear 25; a slide rail 26 is connected between the second bracket 18 and the outer wall of the filter box 5, a moving frame 27 is slidably arranged on the slide rail 26, a rack 28 is arranged on the moving frame 27, first gears 29 are rotatably arranged on both the second bracket 18 and the outer wall of the filter box 5, the two first gears 29 are key-connected to the second rotating shaft 30, a second gear 31 is key-connected to the rotating shaft 22, and the second gear 31 meshes with the first gear 29; a chute is arranged at the bottom of the moving frame 27, a guide rod 32 is arranged in the chute, a slider 33 is arranged in the chute, the guide rod 32 penetrates through the slider 33, a pin shaft 34 is connected to the slider 33, and a spring 35 is sleeved on the guide rod 32.

[0033] In the initial state, the slider 33 is at one end of the chute close to the connecting ear 17 under the elastic force of the spring 35, and the electric push rod 18 is at the maximum stroke, that is, the second connecting ear 25 abuts against the connecting ear 17, and the pin shaft 34 is not inserted into the pin holes of the connecting ear 17 and the second connecting ear 25; when it is necessary to clean the filter component, first pull the wrench 24 to make the flap 23 rotate to the same horizontal state as the partition 20. At this time, the rotating shaft 22 drives the second gear 31 to rotate, the second gear 31 drives the first gear 29 to rotate, and the first gear 29 drives the rack 28 to move, that is, drives the moving frame 27 to slide laterally on the slide rail 26, so that the pin shaft 34 on the moving frame 27 moves laterally and is inserted into the pin holes of the connecting ear 17 and the second connecting ear 25, so that the screw rod 13 is connected to the output end of the electric push rod 18. That is, when the wrench 24 is pulled to make the flap 23 rotate to the same horizontal state as the partition 20, the screw rod 13 is also linked to be connected to the output end of the electric push rod 18. Otherwise, the action of the electric push rod 18 cannot be transmitted to the screw rod 13.

[0034] The chute provides a moving space for pulling the screw rod 13 outward. At the same time, the cooperation between the slider 33 and the guide rod 32 eliminates the rotational freedom of the second connecting ear 25, while the rotational connection between the connecting ear 17 and the screw rod 13 retains the rotational freedom of the screw rod 13, so that the screw rod 13 can rotate while moving outward.

[0035] A housing 36 is connected to the outer wall of the filter box 5. The wrench 24 is used as a manual operating part and is located outside the housing 36, while the electric push rod 18, the second connecting ear 25, the second bracket 18, the slide rail 26, the moving frame 27, the rack 28, the first gear 29, the second rotating shaft 30, the second gear 31, the guide rod 32, the slider 33, the pin shaft 34, and the spring 35 are all arranged inside the housing 36, aiming to isolate and protect each meshing moving part in the harsh environment of the mining area where the mine car works.

[0036] Reference appendix Figure 2 and 6 Moreover, in this embodiment, a scraping member 37 for cleaning the inner bottom wall of the filter box 5 is provided to scrape the impurities with strong adhesion deposited and attached to the bottom wall of the filter box 5. Specifically, a ring groove is provided on the bottom wall of the filter box 5, and the scraping member 37 is arranged on the ring groove. There is a section on the ring groove where the bottom wall of the filter box 5 is hollowed out. A section of ring teeth 38 is provided at the bottom of the scraping member 37, and the ring teeth 38 are exposed outside the bottom wall of the air filter box 5. The scraping member 37 can rotate on the ring groove and plays a role in closing the ring groove. The scraping member 37 is in contact with the inner bottom wall of the air filter box 5. A motor 39 is connected to the outer bottom wall of the air filter box 5, and a rotating gear 40 is connected to the output end of the motor 39. The rotating gear 40 meshes with the ring teeth 38.

[0037] When it is necessary to clean the inner bottom wall of the filter box 5, generally in the first stage of oil discharge, that is, the stage when the impurities are scraped off and discharged into the waste liquid tank along with the oil, the motor 39 drives the rotating gear 40 to rotate reciprocally, and then drives the scraping member 37 to rotate reciprocally in the ring groove by meshing with the ring teeth 38. The rotating scraping member 37 scrapes the inner bottom wall of the filter box 5.

[0038] Based on the section where the bottom wall of the filter box 5 is hollowed out on the ring groove, although the scraping member 37 is arranged on the ring groove to play a certain role in closing the ring groove, the airtightness cannot be guaranteed, and there is a possibility of oil leakage. To ensure the airtightness of the oil circulation during operation, a sealing mechanism is provided by utilizing the rotation of the scraping member 37. Specifically, a fixed ring 41 is connected to the bottom of the filter box 5. The middle part of the fixed ring 41 is a circular groove. A rotating blade 43 is rotatably connected to the fixed ring 41 through a plurality of positioning bolts 42. The rotating blade 43 is also rotatably connected to the scraping member 37 through a connecting rod 44 connected by rotation. When the scraping member 37 rotates, the rotating blade 43 is driven to rotate around the positioning bolt 42 through the connecting rod 44, so as to realize the control of closing or opening the circular groove in the middle of the fixed ring 41. In the working state of the hydraulic device, the rotating blade 43 closes completely to seal the circular groove in the middle of the fixed ring 41.

[0039] The present invention is applicable to ore trucks in harsh working conditions, and performs impurity removal treatment on the oil circulation of the ore trucks. An independent filter box 5 is provided, and the circulating oil is subjected to real-time impurity removal treatment through the built-in filtering components. On the one hand, a certain oil flow rate is retained through the outer filter screen, and impurities are isolated outside the outer filter screen. On the other hand, metal impurities in the oil are adsorbed on the inner cylinder by the magnetic rod. The present invention can regularly clean the filtering components, control the scraping ring and scraping strip to rotate and retract through the electric push rod, and scrape off the attached impurities. The present invention also discharges the oil in the filter box in stages by setting a rotating plate. The oil with a high impurity content in the initial stage is treated as waste liquid, and the flushing oil in the second stage can be recycled, and at the same time, the impurities remaining in the first stage can be flushed out. The present invention also has an anti-fool operation. When the wrench is pulled to make the flap rotate to the same level as the partition board, the screw rod is also linked to the output end of the electric push rod, otherwise the action of the electric push rod cannot be transmitted to the screw rod.

[0040] The foregoing are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A hydraulic device for a mine car, comprising an oil tank (2), an overflow valve (3) and a reversing valve (4) are connected to the top of the oil tank (2), the overflow valve (3) and the reversing valve (4) are communicated, the reversing valve (4) is communicated with the oil tank (2), and it is characterized in that: One side of the fuel tank (2) is connected to a filter tank (5). A first solenoid valve (6) is connected to the top of the filter tank (5). The overflow valve (3) and the reversing valve (4) are both connected to the first solenoid valve (6) through pipelines. The bottom of the filter tank (5) is connected to a second solenoid valve (7). The second solenoid valve (7) is connected to the fuel tank (2) through a return pipe (8). One end of the return pipe (8) placed inside the filter tank (5) is connected with a filtering component.

2. The hydraulic device for a mine car according to claim 1, wherein: A cooling fan (9) is provided on the fuel tank (2). The return pipe (8) is in the forced convection formed by the cooling fan (9).

3. The hydraulic device for a mine car according to claim 1, characterized in that: The filtering component includes an outer filter screen (10) connected to the end of the return pipe (8). The outer filter screen (10) is densely covered with filtering holes. An inner cover cylinder (11) connected thereto is arranged inside the outer filter screen (10). A magnetic rod (12) is arranged inside the inner cover cylinder (11). The magnetic rod generates a stable magnetic field.

4. The hydraulic device for a mine car according to claim 3, characterized in that: It further includes a scraping component, which includes a screw rod (13) movably penetrating through the filter tank (5). One end of the screw rod (13) inside the filter tank (5) is connected with an end cover (14). The ends of the outer filter screen and the inner cover cylinder different from the return pipe (8) are open. The magnetic rod (12) is connected to the end cover (14). Scraping rings (15) are arranged on the inner and outer walls of the outer filter screen (10) and the outer wall of the inner cover cylinder (11). The scraping rings (15) are connected to the end cover (14) through scraping bars (16). The screw rod (13) is controlled to be pulled out of the filter tank (5).

5. The hydraulic device for a mine car according to claim 4, characterized in that: Threaded segments are arranged on the screw rod (13). When the threaded segments penetrate through the filter tank (5), they are in threaded cooperation with the filter tank (5). One end of the screw rod (13) outside the filter tank (5) is rotatably connected with a connecting ear (17). The filter tank (5) is connected with a second support (18). An electric push rod (19) is connected to the second support (18). The output end of the electric push rod (18) is connected with the connecting ear (17).

6. The hydraulic device for a mine car according to claim 4, characterized in that: The bottom of the filter tank (5) is connected to a waste liquid tank (45) through a third solenoid valve (20). A partition plate (21) is fixedly connected inside the filter tank (5). A flap (23) is rotatably connected to the partition plate (21) through a rotating shaft (22). One end of the rotating shaft (22) extends outside the filter tank (5) and is connected with a wrench (24).

7. The hydraulic device for a mine car according to claim 6, characterized in that: The output end of the electric push rod (18) is connected with a second connecting ear (25). Pin holes are arranged on the connecting ear (17) and the second connecting ear (25). A sliding rail (26) is connected between the second support (18) and the outer wall of the filter tank (5). A moving frame (27) is slidably arranged on the sliding rail (26). A rack (28) is arranged on the moving frame (27). First gears (29) are rotatably arranged on the outer walls of the second support (18) and the filter tank (5). The two first gears (29) are key-connected to a second rotating shaft (30). A second gear (31) is key-connected to the rotating shaft (22). The second gear (31) is meshed with the first gears (29). A chute is arranged at the bottom of the moving frame (27). A guide rod (32) is arranged in the chute. A slider (33) is arranged in the chute. The guide rod (32) penetrates through the slider (33). A pin shaft (34) is connected to the slider (33). A spring (35) is sleeved on the guide rod (32).

8. The feature of the device according to claim 1 is that: a housing (36) is connected to the outer wall of the filter box (5), the wrench (24) is located outside the housing (36), and the electric push rod (18), the second connecting ear (25), the second bracket (18), the slide rail (26), the moving frame (27), the rack (28), the first gear (29), the second rotating shaft (30), the second gear (31), the guide rod (32), the slider (33), the pin shaft (34), and the spring (35) are all disposed inside the housing (36).

9. The hydraulic device for a mine car according to claim 7, characterized in that: A ring groove is provided on the bottom wall of the filter box (5), a scraping member (37) is arranged on the ring groove, a section of the bottom wall of the filter box (5) is hollowed out on the ring groove, a section of ring teeth (38) is provided at the bottom of the scraping member (37), the ring teeth (38) are exposed outside the bottom wall of the air filter box (5), and the scraping member (37) is attached to the inner bottom wall of the air filter box (5); a motor (39) is connected to the outer bottom wall of the air filter box (5), a rotating gear (40) is connected to the output end of the motor (39), and the rotating gear (40) meshes with the ring teeth (38).

10. The hydraulic device for a mine car according to claim 9, characterized in that: A fixed ring (41) is connected to the bottom of the filter box (5), the middle of the fixed ring (41) is a circular groove, a rotating blade (43) is rotatably connected to the fixed ring (41) through a plurality of positioning bolts (42), and the rotating blade (43) is also rotatably connected to the scraping member (37) through a rotatably connected connecting rod (44).

Images