Discharging system, container and underground coal car

Abstract

The utility model relates to the technical field of coal cars, in particular to a discharging system, a container and an underground coal car. The discharging system comprises a pump set, an electric proportional load sensitive multi-way valve set and a discharging oil cylinder assembly. The unloading oil cylinder assembly is connected with a container on the underground coal car and is used for controlling the container on the underground coal car to unload; the pump set is connected with the electric proportional load sensitive multi-way valve set through a pipeline and used for pumping hydraulic oil in the hydraulic oil tank to the electric proportional load sensitive multi-way valve set in a one-way mode. The electric proportional load sensitive multi-way valve group is connected with the unloading oil cylinder assembly through a pipeline; the electric proportional load sensitive multi-way valve set is used for conveying hydraulic oil pumped by the pump set to all oil cylinders in the unloading oil cylinder assembly, so that the unloading oil cylinder assembly controls a container on the underground coal car to unload. According to the utility model, the action sequence of the oil cylinders in the unloading oil cylinder assembly can be adjusted according to actual requirements, the unloading time of a container is adjusted in real time, and the unloading efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal car technology field especially relates to a unloading system, freight container and underground coal car. BACKGROUND

[0002] The unloading system of underground coal car generally adopts plunger pump as power element, and then controls valve group and flow distributor etc.

[0003] However, the unloading system adopts flow distributor to control the action sequence of hopper oil cylinder, pushing oil cylinder and tail oil cylinder, and the flow distributor cannot adjust the action sequence of hopper oil cylinder, pushing oil cylinder and tail oil cylinder in real time, and thus the unloading system cannot adjust the unloading time of the material in the freight container, so that the unloading efficiency of the unloading system is low. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving one of the technical problems in prior art or related art.

[0005] Therefore, the utility model provides a unloading system, which can adjust the action sequence of the oil cylinder in the unloading oil cylinder assembly according to actual needs, and thus adjust the unloading time of the material in the freight container in real time, and improve the unloading efficiency of the unloading system.

[0006] The utility model further provides a freight container comprising the above unloading system.

[0007] The utility model further provides an underground coal car comprising the above unloading system, or an underground coal car comprising the above freight container.

[0008] According to the unloading system of the utility model first aspect embodiment, be applied to underground coal car, including pump group, electric proportional load sensitive multiway valve group and unloading oil cylinder assembly;

[0009] The unloading oil cylinder assembly is connected with the freight container on the underground coal car, and is used for controlling the freight container on the underground coal car to unload;

[0010] The pump group and the electric proportional load sensitive multiway valve group are connected through pipeline, and the pump group is used for pumping the hydraulic oil in the hydraulic oil tank to the electric proportional load sensitive multiway valve group in one way;

[0011] The electric proportional load sensitive multiway valve group and the unloading oil cylinder assembly are connected through pipeline;The electric proportional load sensitive multiway valve group is used for delivering the hydraulic oil pumped by the pump group to each oil cylinder in the unloading oil cylinder assembly respectively, so that the unloading oil cylinder assembly controls the freight container on the underground coal car to unload.

[0012] Optionally, the electric proportional load-sensing multi-way valve group comprises a plurality of valve blocks connected in parallel with the pump group, and each valve block is connected with one oil cylinder in the unloading oil cylinder group in one-to-one correspondence.

[0013] Optionally, the valve block comprises:

[0014] a valve body connected with one oil cylinder in the unloading oil cylinder group through a pipeline;

[0015] a valve core located in the valve body and movable in the valve body, the valve core being used to control the flow of hydraulic oil in the valve body to control the flow of hydraulic oil delivered to the oil cylinder connected with the valve body.

[0016] Optionally, the valve body has a first valve cavity, a second valve cavity and a third valve cavity in communication with each other, and the first valve cavity, the second valve cavity and the third valve cavity are coaxially arranged; the valve core is movable between the first valve cavity, the second valve cavity and the third valve cavity; the valve core is used to control the flow of hydraulic oil in the first valve cavity and / or the second valve cavity and / or the third valve cavity;

[0017] wherein when the first valve cavity moves with the valve core to communicate with the oil cylinder connected with the valve block, the oil cylinder connected with the valve block is in an extended state; when the second valve cavity moves with the valve core to communicate with the oil cylinder connected with the valve block, the oil cylinder connected with the valve block is in a length-fixed state; and when the third valve cavity moves with the valve core to communicate with the oil cylinder connected with the valve block, the oil cylinder connected with the valve block is in a retracted state.

[0018] Optionally, the electric proportional load-sensing multi-way valve group further comprises:

[0019] a position sensor arranged on the valve body and used to monitor the moving position of the valve core to determine whether the oil cylinder connected with the valve block communicates with the first valve cavity, the second valve cavity or the third valve cavity.

[0020] Optionally, the unloading oil cylinder group comprises:

[0021] a first oil cylinder connected with the cargo box and connected with one valve block in the plurality of valve blocks through a pipeline; the first oil cylinder is used to lift the cargo box to control the lifting height of the cargo box;

[0022] a second oil cylinder connected with a pushing mechanism in the cargo box and connected with another valve block in the plurality of valve blocks through a pipeline; the second oil cylinder is used to control the pushing mechanism to move in the cargo box along the length direction of the cargo box to push the material in the cargo box out of the cargo box;

[0023] a third oil cylinder connected with a tail door on the cargo box and connected with another valve block in the plurality of valve blocks through a pipeline; the third oil cylinder is used to control the tail door to flip on the cargo box.

[0024] Optionally, the pump group is a load-sensing plunger pump.

[0025] Optionally, a high-pressure filter is further included, the high-pressure filter is located between the electric proportional load-sensitive multi-way valve group and the pump group, and the high-pressure filter is used for filtering hydraulic oil pumped by the pump group to the electric proportional load-sensitive multi-way valve group.

[0026] According to the second aspect of the utility model, a container is provided, which comprises the unloading system of the first aspect and each embodiment.

[0027] According to the third aspect of the utility model, an underground coal transport vehicle is provided, which comprises the unloading system of the first aspect and each embodiment, or the container of the second aspect.

[0028] The above technical solution has at least the following advantages or beneficial effects:

[0029] For the unloading system of the utility model, the pump group and the electric proportional load-sensitive multi-way valve group are connected through pipelines, so that the pump group pumps the hydraulic oil in the hydraulic oil tank to the electric proportional load-sensitive multi-way valve group in one direction; the electric proportional load-sensitive multi-way valve group is connected with the unloading oil cylinder assembly through pipelines, so that the oil cylinders in the unloading oil cylinder assembly are controlled by the electric proportional load-sensitive multi-way valve group, so that the electric proportional load-sensitive multi-way valve group adjusts the action sequence of the oil cylinders in the unloading oil cylinder assembly according to actual needs, and then adjusts the unloading time of the materials in the container in real time, and improves the unloading efficiency of the unloading system.

[0030] The container provided by the utility model embodiment has the unloading system described above, and since the unloading system has the above technical effects, the container provided with the unloading system should also have corresponding technical effects.

[0031] The underground coal transport vehicle provided by the utility model embodiment has the unloading system or the container described above, and since the unloading system or the container has the above technical effects, the underground coal transport vehicle provided with the unloading system or the container should also have corresponding technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A hydraulic principle diagram of the unloading system of one embodiment of the utility model is shown.

[0033]

LEGEND OF THE DRAWINGS

[0034] 1, pump group;

[0035] 2, electric proportional load-sensitive multi-way valve group, 201, valve block, 202, first valve cavity, 203, second valve cavity, 204, third valve cavity;

[0036] 3, first oil cylinder;

[0037] 4, second oil cylinder;

[0038] 5. third oil cylinder;

[0039] 6. high-pressure filter;

[0040] 7. hydraulic oil tank. DETAILED DESCRIPTION

[0041] In order to better explain the utility model, so as to facilitate understanding, the utility model is described in detail below by specific implementation modes in combination with the drawings.

[0042] The unloading system of the underground coal transport vehicle generally adopts a plunger pump as a power element, controls the hopper oil cylinder, the pushing oil cylinder and the tail oil cylinder through a control valve group and a flow distributor, and thus the unloading of the materials in the container can be completed.

[0043] However, the unloading system adopts the flow distributor to control the action sequence of the hopper oil cylinder, the pushing oil cylinder and the tail oil cylinder, and thus the unloading time cannot be adjusted in real time, and therefore the unloading efficiency of the unloading system is low.

[0044] In order to at least solve one of the technical problems existing in the prior art or related art, the utility model provides an unloading system, which comprises a pump group, an electric proportional load-sensitive multi-way valve group and an unloading oil cylinder assembly; the unloading oil cylinder assembly is connected with a container on an underground coal transport vehicle, and is used for controlling the container on the underground coal transport vehicle to unload; the pump group and the electric proportional load-sensitive multi-way valve group are connected through pipelines, and the pump group is used for pumping hydraulic oil in a hydraulic oil tank to the electric proportional load-sensitive multi-way valve group in one direction; the electric proportional load-sensitive multi-way valve group is connected with the unloading oil cylinder assembly through pipelines; the electric proportional load-sensitive multi-way valve group is used for delivering the hydraulic oil pumped by the pump group to each oil cylinder in the unloading oil cylinder assembly, so that the unloading oil cylinder assembly controls the container on the underground coal transport vehicle to unload. According to the utility model, the pump group and the electric proportional load-sensitive multi-way valve group are connected through pipelines, so that the pump group pumps the hydraulic oil in the hydraulic oil tank to the electric proportional load-sensitive multi-way valve group in one direction; then the electric proportional load-sensitive multi-way valve group is connected with the unloading oil cylinder assembly through pipelines, so that the oil cylinders in the unloading oil cylinder assembly are controlled by the electric proportional load-sensitive multi-way valve group respectively, so that the electric proportional load-sensitive multi-way valve group adjusts the action sequence of the oil cylinders in the unloading oil cylinder assembly according to actual needs, and thus the unloading time of the materials in the container is adjusted in real time, and the unloading efficiency of the unloading system is improved.

[0045] The unloading system, the container and the underground coal transport vehicle according to some embodiments of the utility model are described below with reference to the drawings.

[0046] Referring to Figure 1The utility model provides an unload system of one embodiment, apply to the coal truck in pit, this unload system includes pump group 1, electric proportional load sensitive multiway valve group 2 and unloading cylinder subassembly, unloading cylinder subassembly is connected with the truck on the coal truck in pit, and unloading cylinder subassembly is used for controlling the truck on the coal truck in pit to unload, pump group 1 is connected with electric proportional load sensitive multiway valve group 2 through pipeline, and pump group 1 is used for the hydraulic oil in hydraulic oil tank 7 one way pumping to electric proportional load sensitive multiway valve group 2, electric proportional load sensitive multiway valve group 2 is connected with unloading cylinder subassembly through pipeline, and electric proportional load sensitive multiway valve group 2 is used for the hydraulic oil of pump group 1 pumping respectively to each cylinder in unloading cylinder subassembly, to make unloading cylinder subassembly control the truck on the coal truck in pit unloads.

[0047] Need to explain, the coal truck in pit is equipped with the whole vehicle controller (VCU), and the whole vehicle controller (VCU) can be electrically connected with electric proportional load sensitive multiway valve group 2, to realize through the whole vehicle controller (VCU) control electric proportional load sensitive multiway valve group 2, and then control the flow of the hydraulic oil that electric proportional load sensitive multiway valve group 2 delivers to unloading cylinder subassembly, to realize control the truck on the coal truck in pit unloads.

[0048] Here, the working oil port A / B of electric proportional load sensitive multiway valve group 2 is connected with each cylinder in unloading cylinder subassembly through pipeline, and pump group 1 can deliver the hydraulic oil required for the operation of the unload system as a power element, specifically, after pump group 1 inhales hydraulic oil from hydraulic oil tank 7, the hydraulic oil is supplied to electric proportional load sensitive multiway valve group 2 through the oil outlet of pump group 1, so that the hydraulic oil flows from the working oil port A / B of electric proportional load sensitive multiway valve group 2 into unloading cylinder subassembly.

[0049] In the embodiment, pump group 1 and electric proportional load sensitive multiway valve group 2 are connected by pipeline, so that pump group 1 pumps the hydraulic oil in hydraulic oil tank 7 to electric proportional load sensitive multiway valve group 2, and then electric proportional load sensitive multiway valve group 2 is connected with unloading cylinder subassembly through pipeline, so that the cylinders in unloading cylinder subassembly are controlled by electric proportional load sensitive multiway valve group 2 respectively, so that electric proportional load sensitive multiway valve group 2 adjusts the action sequence of the cylinders in unloading cylinder subassembly according to actual needs, and then adjusts the unloading time of the materials in the truck in real time, and improves the unloading efficiency of the unload system.

[0050] In some possible embodiments, electric proportional load sensitive multiway valve group 2 includes a plurality of valve blocks 201 connected with pump group 1 in parallel, and the plurality of valve blocks 201 are connected with the cylinders in unloading cylinder subassembly one by one respectively.

[0051] The multiple valve blocks 201 connected in parallel with the pump set 1 can be understood as that the multiple valve blocks 201 are connected in parallel with each other, and each valve block 201 is connected with the pump set 1, so that the pump set 1 pumps the hydraulic oil in the hydraulic oil tank 7 into each valve block 201 respectively.

[0052] Here, the number of valve blocks 201 is not less than the number of oil cylinders in the unloading oil cylinder assembly; when a valve block 201 is connected with an oil cylinder, the output end A / B of the valve block 201 is connected with the oil cylinder.

[0053] Taking the electric proportional load-sensitive multi-way valve set 2 including three valve blocks 201 as an example, the three valve blocks 201 are valve block A, valve block B and valve block C respectively, and the unloading oil cylinder assembly includes oil cylinder A, oil cylinder B and oil cylinder C. When the electric proportional load-sensitive multi-way valve set 2 is connected with the unloading oil cylinder assembly, the output end A1 / B1 of the valve block A can be connected with the oil cylinder A through a pipeline, the output end A2 / B2 of the valve block B can be connected with the oil cylinder B through a pipeline, and the output end A3 / B3 of the valve block C can be connected with the oil cylinder C through a pipeline.

[0054] It should be noted that each valve block 201 in the electric proportional load-sensitive multi-way valve set 2 is electrically connected with the vehicle controller (VCU), so as to realize the control of the hydraulic oil flow in each valve block 201 through the vehicle controller (VCU) and complete the extension and retraction control of the oil cylinder connected with the valve block 201.

[0055] In this embodiment, by selecting the electric proportional load-sensitive multi-way valve set 2 as the multiple valve blocks 201 connected in parallel, and connecting the multiple valve blocks 201 with the oil cylinders in the unloading oil cylinder assembly one by one respectively, each valve block 201 can control the oil cylinder connected therewith, thereby realizing the one-to-one control of each valve block 201 in the electric proportional load-sensitive multi-way valve set 2 on the oil cylinder in the unloading oil cylinder assembly, so that the multiple valve blocks 201 can adjust the action sequence of each oil cylinder in the unloading oil cylinder assembly according to actual needs, thereby adjusting the unloading time of the materials in the cargo box in real time and improving the unloading efficiency of the unloading system.

[0056] Further, the valve block 201 includes a valve body and a valve core. The valve body is connected with an oil cylinder in the unloading oil cylinder assembly through a pipeline. The valve core is located in the valve body and can move in the valve body. The valve core is used to control the flow of the hydraulic oil in the valve body, so as to control the flow and pressure of the hydraulic oil delivered by the valve body.

[0057] The proportional valve set is further arranged on the valve block 201. The proportional valve set is used to adjust the opening amount in the valve body, so as to control the pressure of the hydraulic oil at both ends of the valve core, thereby controlling the pressure and flow of the hydraulic oil output by the valve body.

[0058] In the embodiment, the valve block 201 is selected as the structure of the valve body and the valve core, so that the valve body moves in the valve body, that is, the flow of the hydraulic oil in the valve body is controlled, and then the flow of the hydraulic oil delivered to the oil cylinder connected with the valve body is controlled by the movement of the valve core.

[0059] Furthermore, the valve body has a first valve cavity 202, a second valve cavity 203 and a third valve cavity 204 which are communicated with each other and coaxially arranged, the valve core can move between the first valve cavity 202, the second valve cavity 203 and the third valve cavity 204, the valve core is used for controlling the flow of the hydraulic oil in the first valve cavity 202 and / or the second valve cavity 203 and / or the third valve cavity 204, wherein when the first valve cavity 202 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the oil cylinder connected with the valve block 201 is in an extended state, when the second valve cavity 203 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the oil cylinder connected with the valve block 201 is in a length-fixed state, and when the third valve cavity 204 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the oil cylinder connected with the valve block 201 is in a retracted state.

[0060] It should be noted that the first valve cavity 202, the second valve cavity 203 and the third valve cavity 204 can be communicated in sequence, when the first valve cavity 202 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the communication between the second valve cavity 203 and the third valve cavity 204 and the oil cylinder is disconnected, when the second valve cavity 203 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the communication between the first valve cavity 202 and the third valve cavity 204 and the oil cylinder is disconnected, and when the third valve cavity 204 moves with the valve core to be communicated with the oil cylinder connected with the valve block 201, the communication between the first valve cavity 202 and the second valve cavity 203 and the oil cylinder is disconnected.

[0061] In the embodiment, the position of the valve core moving in the valve body, that is, the valve core moves to the first valve cavity 202, the second valve cavity 203 or the third valve cavity 204 communicated with the oil cylinder connected with the valve block 201, controls the flow of the hydraulic oil delivered to the oil cylinder connected with the valve block 201, controls the oil cylinder to be extended, length-fixed or retracted, so as to realize the control of the state of the oil cylinder connected with the valve body by controlling the movement of the valve core in the valve body.

[0062] Further, the valve block 201 further comprises a position sensor arranged on the valve body, the position sensor is used for monitoring the moving position of the valve core, so as to determine that the oil cylinder connected with the valve block 201 is communicated with the first valve cavity 202 or the second valve cavity 203 or the third valve cavity 204.

[0063] Here, by setting a position sensor on the valve body, real-time monitoring of the position of the valve core can be achieved to determine whether the oil cylinder connected with the valve block 201 moves to communicate with the first valve cavity 202 or the second valve cavity 203 or the third valve cavity 204, and then determine whether the oil cylinder connected with the valve block 201 is in an extended state, a fixed length state or a retracted state, facilitating the driver's control of the unloading oil cylinder assembly.

[0064] In some possible implementations, the unloading oil cylinder assembly includes a first oil cylinder 3, a second oil cylinder 4 and a third oil cylinder 5, the first oil cylinder 3 is connected with the cargo box and connected with one of the plurality of valve blocks 201 through a pipeline; the first oil cylinder 3 is used to lift the cargo box to control the lifting height of the cargo box; the second oil cylinder 4 is connected with the pushing mechanism in the cargo box and connected with another valve block 201 of the plurality of valve blocks 201 through a pipeline; the second oil cylinder 4 is used to control the pushing mechanism to move in the cargo box along the length direction of the cargo box to push the material in the cargo box out of the cargo box; the third oil cylinder 5 is connected with the tail door on the cargo box and connected with another valve block 201 of the plurality of valve blocks 201 through a pipeline; the third oil cylinder 5 is used to control the tail door to overturn on the cargo box.

[0065] It should be noted that when the material in the cargo box is unloaded, the first oil cylinder 3 is controlled to elongate, so that the cargo box is lifted to a preset position; then the third oil cylinder 5 is controlled to make the tail door overturn, so that the tail door is opened; finally, the second oil cylinder 4 is controlled to move the pushing mechanism in the length direction of the cargo box, so that the material in the cargo box is pushed out of the cargo box, and the unloading of the material in the cargo box is completed.

[0066] In this embodiment, by connecting the first oil cylinder 3, the second oil cylinder 4 and the third oil cylinder 5 with the three valve blocks 201 in the electric proportional load-sensitive multi-way valve group 2 one by one, the first oil cylinder 3, the second oil cylinder 4 and the third oil cylinder 5 can be controlled to control the lifting height of the cargo box, the movement of the pushing mechanism and the overturning of the tail door on the cargo box respectively, so that the unloading of the material in the cargo box is completed by controlling the corresponding states of the first oil cylinder 3, the second oil cylinder 4 and the third oil cylinder 5 in the unloading oil cylinder assembly.

[0067] In some possible implementations, the pump group 1 is a load-sensitive plunger pump.

[0068] In this embodiment, by using the load-sensitive plunger pump and the electric proportional load-sensitive multi-way valve group 2 together, an electric proportional load-sensitive unloading system can be established on the coal truck in the pit.

[0069] In some possible implementation embodiments, the unloading system further comprises a high-pressure filter 6, which is located between the electric proportional load-sensing multi-way valve group 2 and the pump group 1, and is used for filtering the hydraulic oil pumped by the pump group 1 to the electric proportional load-sensing multi-way valve group 2.

[0070] Here, by arranging the high-pressure filter 6 between the electric proportional load-sensing multi-way valve group 2 and the pump group 1, the high-pressure filter 6 can filter the hydraulic oil before the pump group 1 pumps the hydraulic oil to the electric proportional load-sensing multi-way valve group 2, so as to avoid impurities in the hydraulic oil from entering the electric proportional load-sensing multi-way valve group 2.

[0071] The utility model provides a kind of container of one embodiment of the present application, including the unloading system in any of the above embodiments.

[0072] Since the container of the embodiment includes any unloading system in the above first aspect, it has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0073] The utility model provides a kind of underground coal car of one embodiment of the present application, including the unloading system in any of the above embodiments or the container in any of the above embodiments.

[0074] Since the underground coal car of the embodiment includes any unloading system in the above first aspect or the container of the second aspect, it has the beneficial effects of any of the above embodiments, which will not be repeated here.

[0075] In the description of the utility model, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0076] In the utility model, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through intermediate medium; it can be the communication inside two elements or the interaction relationship between two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0077] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature is "above", "over" and "on" the second feature, which can be directly above or obliquely above the first feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "below", "under" and "under" the second feature, which can be directly below or obliquely below the first feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0078] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "embodiment", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. Furthermore, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0079] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can modify, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A material unloading system for use in underground coal transport vehicles, characterized in that, The pump group, the electric proportional load-sensitive multi-way valve group and the unloading oil cylinder assembly are provided. The unloading oil cylinder assembly is connected with the container on the underground coal transport vehicle and is used for controlling the container on the underground coal transport vehicle to unload. The pump group is connected with the electric proportional load-sensitive multi-way valve group through pipelines and is used for pumping hydraulic oil in a hydraulic oil tank to the electric proportional load-sensitive multi-way valve group in a one-way manner. The electric proportional load-sensitive multi-way valve group is connected with the unloading oil cylinder assembly through pipelines and is used for delivering the hydraulic oil pumped by the pump group to each oil cylinder in the unloading oil cylinder assembly so that the unloading oil cylinder assembly controls the container on the underground coal transport vehicle to unload.

2. The system of claim 1, wherein, The electric proportional load-sensitive multi-way valve group comprises a plurality of valve blocks which are connected with the pump group in a parallel manner and are connected with the oil cylinders in the unloading oil cylinder assembly one by one.

3. The system of claim 2, wherein, The valve block comprises: a valve body which is connected with an oil cylinder in the unloading oil cylinder assembly through pipelines; a valve core which is located in the valve body and is movable in the valve body and is used for controlling the flow of the hydraulic oil in the valve body so as to control the flow of the hydraulic oil delivered to the oil cylinder connected with the valve body.

4. The system of claim 3, wherein, The valve body has a first valve cavity, a second valve cavity and a third valve cavity which are coaxially arranged and are in communication with each other; the valve core is movable between the first valve cavity, the second valve cavity and the third valve cavity; the valve core is used for controlling the flow of the hydraulic oil in the first valve cavity and / or the second valve cavity and / or the third valve cavity; wherein, when the first valve cavity is moved to be in communication with the oil cylinder connected with the valve block along with the valve core, the oil cylinder connected with the valve block is in an extended state; when the second valve cavity is moved to be in communication with the oil cylinder connected with the valve block along with the valve core, the oil cylinder connected with the valve block is in a length-fixed state; when the third valve cavity is moved to be in communication with the oil cylinder connected with the valve block along with the valve core, the oil cylinder connected with the valve block is in a retracted state.

5. The system of claim 4, wherein, The electric proportional load-sensitive multi-way valve group further comprises: a position sensor which is arranged on the valve body and is used for monitoring the moving position of the valve core so as to determine whether the oil cylinder connected with the valve block is in communication with the first valve cavity, the second valve cavity or the third valve cavity.

6. The system of claim 2, wherein, The unloading oil cylinder assembly comprises: a first oil cylinder which is connected with the container and is connected with one valve block among the plurality of valve blocks through pipelines and is used for lifting the container so as to control the lifting height of the container; a second oil cylinder which is connected with a pushing mechanism in the container and is connected with another valve block among the plurality of valve blocks through pipelines and is used for controlling the pushing mechanism to move in the container along the length direction of the container so as to push the material in the container out of the container; a third oil cylinder which is connected with a tail door on the container and is connected with still another valve block among the plurality of valve blocks through pipelines and is used for controlling the tail door to turn over on the container.

7. The system of claim 1, wherein, The pump group is a load-sensitive plunger pump.

8. The system of claim 1, wherein, A high pressure filter is also included between the electric proportional load sensing multi-way valve block and the pump block, which is used to filter the hydraulic oil pumped by the pump block to the electric proportional load sensing multi-way valve block.

9. A cargo box characterized by, A discharge system as claimed in any one of claims 1 to 8.

10. A coal haulage car for use in a mine, characterized by A cargo box as claimed in claim 9, or a discharge system as claimed in any one of claims 1 to 8.

Images