Push unloading type unloading control system of underground mine car and control method of push unloading type unloading control system

Abstract

The invention belongs to the technical field of underground mine transportation equipment, and particularly relates to an underground mine car pushing unloading type unloading control system and a control method thereof.The control system comprises a hydraulic oil tank, a hydraulic pump is connected to an oil outlet of the hydraulic oil tank, and a reversing valve set and a sequence valve set are sequentially connected to an oil outlet of the hydraulic pump; the reversing valve set is provided with an opening control oil port and a reset control oil port, the sequence valve set is provided with a first oil inlet and a second oil inlet, the first oil inlet and the second oil inlet are connected with the opening control oil port and the reset control oil port respectively, and a plurality of oil outlets of the sequence valve set are connected with a push plate oil cylinder and a tail door oil cylinder respectively. The hydraulic system structure is optimized, automatic control is achieved with the sequence valve as the core, orderliness and accuracy of actions of the tail door oil cylinder and the push plate oil cylinder are guaranteed, the discharging efficiency and the equipment reliability are improved, and the hydraulic system is suitable for the narrow space environment of underground operation.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of underground mine transportation equipment, and particularly relates to a push-unloading type unloading control system of an underground mine car and a control method thereof. BACKGROUND

[0002] In an underground mine, as a core material transportation equipment, the unloading efficiency and adaptability of the underground mine car affect the production efficiency of the entire mine exploitation. Due to the limitation of geological conditions, exploitation planning and other factors, the space height is often limited when the underground roadway is excavated, at which time the push-unloading type underground mine car needs to be used to replace the traditional rear-flipping unloading type underground mine car.

[0003] The so-called push-unloading type underground mine car is to set a hydraulic tail door at the tail of the cargo compartment and install a hydraulic push plate inside the cargo box, so as to realize unloading by pushing the ore from the tail door through the push plate. In order to ensure the sequential action of the hydraulic tail door and the hydraulic push plate, a sequence valve needs to be added in the hydraulic system for control, so as to prevent the push plate from starting to push before the tail door is completely opened, or the tail door from closing before the push plate is reset, otherwise, not only the unloading efficiency is affected, but also the equipment failure is caused.

[0004] A utility model patent with the application number 202420237430.4 discloses a compartment type garbage truck lifting unloading control system, in which a hydraulic oil tank is connected with two multi-way valves through a hydraulic oil pump, the two multi-way valves are connected in parallel and connected with a tail door opening and closing oil cylinder and a box body lifting oil cylinder respectively, and a tail door opening to position device is further connected between the multi-way valve and the box body lifting oil cylinder. The patent adopts a scheme of "mechanical triggering + double valve parallel control", after the tail door is opened to position, a reversing lever of the tail door opening to position device is physically pushed, and then the valve core is reversed, so as to realize the conduction of the box body lifting oil cylinder oil circuit.

[0005] This control method has low control integration, and lacks precise sequence and time coordination for the action control of the hydraulic push plate and the hydraulic tail door, and cannot adapt to the complex working environment in the underground mine, therefore, it is urgent to develop a push-unloading type unloading control method of the underground mine car with high integration and automatic precise control, so as to meet the efficient and reliable unloading operation demand in the narrow space in the underground. SUMMARY

[0006] The main technical problem to be solved by the present application is to provide a push-unloading type unloading control system of an underground mine car and a control method thereof, which realizes automatic control by optimizing the structure of the hydraulic system with the sequence valve as the core, guarantees the orderliness and precision of the action of the tail door oil cylinder and the push plate oil cylinder, improves the unloading efficiency and equipment reliability, and adapts to the narrow space environment of the underground operation.

[0007] In order to solve the above technical problems, the present application provides the following technical scheme: The underground mine car push-off type unloading control system comprises a hydraulic oil tank, a hydraulic pump connected to the oil outlet of the hydraulic oil tank, a reversing valve group and a sequence valve group connected to the oil outlet of the hydraulic pump in sequence, the reversing valve group being provided with an opening control oil port and a reset control oil port, the sequence valve group being provided with a first oil inlet and a second oil inlet, the first oil inlet and the second oil inlet being connected to the opening control oil port and the reset control oil port respectively, and a plurality of oil outlets of the sequence valve group being connected to a push plate oil cylinder and a tail door oil cylinder respectively.

[0008] The underground mine car push-off type unloading control system comprises a hydraulic oil tank, a hydraulic pump connected to the oil outlet of the hydraulic oil tank, a reversing valve group and a sequence valve group connected to the oil outlet of the hydraulic pump in sequence, the reversing valve group being provided with an opening control oil port and a reset control oil port, the sequence valve group being provided with a first oil inlet and a second oil inlet, the first oil inlet and the second oil inlet being connected to the opening control oil port and the reset control oil port respectively, and a plurality of oil outlets of the sequence valve group being connected to a push plate oil cylinder and a tail door oil cylinder respectively.

[0009] The first oil inlet and the tail door opening oil outlet in the sequence valve group are connected to the first one-way adjustable flow valve and the second one-way adjustable flow valve in sequence, and the installation directions of the two valves are opposite.

[0010] The hydraulic oil tank and the hydraulic pump are connected to an oil suction filter, and the hydraulic oil tank is further provided with an oil return filter.

[0011] The underground mine car push-off type unloading control method is realized based on the underground mine car push-off type unloading control system, and the specific steps are as follows: S1, starting the engine of the underground mine car to drive the hydraulic pump to work and extract hydraulic oil from the hydraulic oil tank to provide oil basis for the system; S2, the driver presses the unloading operation button, the opening control oil port is opened, and the oil is transported from the opening control oil port to the first oil inlet of the sequence valve group; S3, the oil flows out of the tail door opening oil outlet and enters the rodless cavity of the tail door oil cylinder, the piston rod of the tail door oil cylinder is extended, and the tail door is opened; S4, after the piston rod of the tail door oil cylinder is extended to the maximum stroke, the oil continuously enters the rodless cavity of the tail door oil cylinder, the pressure in the cavity is increased to the set opening pressure of the control sequence valve, the spool of the control sequence valve is transposed, and the spool of the main sequence valve is opened; S5, after the main sequence valve is opened, the high-pressure oil in the first oil inlet flows into the rodless cavity of the push plate oil cylinder through the oil outlet of the main sequence valve, the piston rod of the push plate oil cylinder is extended, and the ore is pushed to fall from the tail door; S6, after the ore is completely unloaded, the driver presses the reset operation button, the control system controls the other group of electromagnetic valves of the reversing valve group to be electrified, the spool of the reversing valve group is switched to the reset station, the reset control oil port is opened, and oil is transported from the reset control oil port to the second oil inlet of the sequence valve group; S7, the oil flowing from the second oil inlet part of the oil is discharged through the push plate reset oil outlet into the rod cavity of the push plate oil cylinder, the push plate oil cylinder piston rod is retracted, and the push plate is controlled to reset; the other part of the oil is discharged through the tail gate closing oil outlet into the rod cavity of the tail gate oil cylinder, the tail gate oil cylinder piston is retracted, and the tail gate is controlled to close; S8, after the push plate oil cylinder and the tail gate oil cylinder are reset to the position, the control system sends a signal to stop the operation of the hydraulic pump, and the electromagnetic valve of the reversing valve group is de-energized, the spool is reset to the middle position, and the delivery of high-pressure oil is cut off.

[0012] Further optimization: in step S2, the specific step of opening the control oil port is that the control system controls the electromagnetic valve of the reversing valve group to be electrified, and the spool of the reversing valve group is switched to the unloading station to open the control oil port.

[0013] Further optimization: in step S3, the oil flows out from the tail gate opening oil outlet after flowing through the first and second one-way adjustable flow valves in sequence, and the opening speed of the tail gate is controlled by adjusting the throttling area of the first one-way adjustable flow valve.

[0014] Further optimization: in step S4, the specific step of opening the main sequence valve is that after the spool of the sequence valve is switched, the oil at the control end of the main sequence valve flows back to the hydraulic oil tank through the oil outlet of the control sequence valve, the pressure at the control end of the main sequence valve instantaneously decreases to 0MPa, and the spool of the main sequence valve is opened under the action of the inlet pressure.

[0015] Further optimization: in step S3, the residual oil in the rod cavity of the tail gate oil cylinder is discharged in sequence through the tail gate closing oil outlet and the second oil inlet; in step S5, the residual oil in the rod cavity of the push plate oil cylinder is discharged in sequence through the push plate reset oil outlet and the second oil inlet.

[0016] Further optimization: in step S7, the oil in the rodless cavity of the push plate oil cylinder is discharged in sequence through the push plate unloading oil outlet, the main sequence valve, the control sequence valve and the first oil inlet; the oil in the rodless cavity of the tail gate oil cylinder is discharged in sequence through the tail gate opening oil outlet, the second one-way adjustable flow valve, the first one-way adjustable flow valve and the first oil inlet, and the throttling area of the second one-way adjustable flow valve is controlled to adjust the closing speed of the tail gate.

[0017] The above technical scheme has the following beneficial effects: The hydraulic control system of the application integrates hydraulic oil tank, oil suction filter, hydraulic pump, reversing valve, sequence valve and other components, and has compact structure and high integration degree; meanwhile, taking sequence valve as the core, automatic control of tail door oil cylinder and push plate oil cylinder action is realized through oil pressure change, without manual intervention of action sequence, labor intensity of operators is reduced, and equipment failure risk caused by human operation error is reduced.

[0018] The hydraulic control system of the application strictly guarantees the sequence of "tail door opening first and push plate pushing later" during unloading and "synchronous action of push plate and tail door" during resetting through the synergistic effect of internal control sequence valve and main sequence valve of sequence valve group, and avoids unsmooth unloading or equipment damage caused by chaotic action; The application is provided with two reversely installed one-way adjustable flow valves, which can control the opening and closing speed of the tail door respectively, adapt to different ore characteristics and operation conditions, and improve the flexibility and stability of unloading operation.

[0019] The hydraulic control system of the application is provided with oil suction filter and oil return filter, which double filters the hydraulic oil, effectively removes impurities in the oil, prevents hydraulic components from being stuck and worn, prolongs the service life of the hydraulic system, reduces the equipment maintenance cost, and ensures long-term stable operation of the underground mine car.

[0020] The application will be further described below in combination with the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the hydraulic control system in the embodiment of the application; Figure 2 It is a schematic diagram of the internal structure and oil circuit connection of the sequence valve in the embodiment of the application; Figure 3 It is a schematic diagram of the unloading control method flow in the embodiment of the application.

[0022] In the figure: 1, hydraulic oil tank; 2, oil suction filter; 3, hydraulic pump; 4, reversing valve group; 401, opening control oil port; 402, resetting control oil port; 5, sequence valve group; 501, first one-way adjustable flow valve; 502, second one-way adjustable flow valve; 503, main sequence valve; 504, control sequence valve; 505, first oil inlet; 506, second oil inlet; 507, tail door opening oil outlet; 508, tail door closing oil outlet; 509, push plate unloading oil outlet; 510, push plate resetting oil outlet; 6, push plate oil cylinder; 7, tail door oil cylinder; 8, oil return filter. DETAILED DESCRIPTION

[0023] The application relates to a push-unloading type unloading control system of an underground mine car, which comprises a hydraulic control system and a push plate oil cylinder and a tail door oil cylinder connected to the hydraulic control system. Figure 1As shown, the hydraulic control system comprises a hydraulic oil tank 1 for storing hydraulic oil, an oil outlet of the hydraulic oil tank 1 is connected with a hydraulic pump 3, the hydraulic pump 3 is driven by an engine of the underground mine car, is used for converting mechanical energy of the engine into hydraulic energy, provides high-pressure oil for the whole system, and an oil suction filter 2 is further connected between the hydraulic oil tank 1 and the hydraulic pump 3, is used for intercepting impurities in the oil tank, and guarantees the cleanliness of the oil in the working system.

[0024] An oil outlet of the hydraulic pump 3 is sequentially connected with a reversing valve group 4 and a sequence valve group 5, the reversing valve group 4 is a valve group integrated by a three-position six-way electromagnetic reversing valve and a plurality of overflow valves: the three-position six-way electromagnetic reversing valve switches the direction of oil flow by controlling the valve core of the electromagnetic valve; and the overflow valve is used for controlling the system pressure, when the system pressure rises to the set pressure of the overflow valve, the overflow valve opens, part of the hydraulic oil flows back to the hydraulic oil tank 1 through the overflow valve, thereby reducing the system pressure, and keeping the system pressure below the set pressure value.

[0025] The three-position six-way electromagnetic reversing valve and the overflow valve are mature products in the prior art, and can be purchased from the market according to the actual use demand of the enterprise, and the specific structure will not be described herein.

[0026] As shown in Figure 1 and Figure 2 The reversing valve group 4 is provided with an opening control oil port 401 and a reset control oil port 402, the sequence valve group 5 is provided with a first oil inlet port 505 and a second oil inlet port 506, the first oil inlet port 505 and the second oil inlet port 506 are connected with the opening control oil port 401 and the reset control oil port 402 respectively, and by switching the valve core in the reversing valve group 4, the oil can be controlled to enter the sequence valve group 5 from the first oil inlet port 505 or the second oil inlet port 506.

[0027] A plurality of oil outlets of the sequence valve group 5 are respectively connected with a push plate oil cylinder 6 and a tail door oil cylinder 7, the push plate oil cylinder 6 is used for driving the movement of the unloading push plate, and the tail door oil cylinder 7 is used for driving the opening and closing of the tail door, and the two cooperate to complete the unloading work.

[0028] Specifically, the sequence valve group 5 is provided with a tail door opening oil outlet 507, a tail door closing oil outlet 508, a push plate unloading oil outlet 509 and a push plate reset oil outlet 510, wherein the tail door opening oil outlet 507 and the tail door closing oil outlet 508 are connected with the rodless cavity and the rod cavity of the tail door oil cylinder 7 respectively, when high-pressure oil flows out from the tail door opening oil outlet 507, the tail door oil cylinder 7 piston rod can be driven to extend, realizing the opening of the tail door; when high-pressure oil flows out from the tail door closing oil outlet 508, the tail door oil cylinder 7 piston rod can be driven to retract, realizing the closing of the tail door, and at this time, the oil in the rodless cavity of the tail door oil cylinder 7 will be discharged in turn through the tail door opening oil outlet 507 and the first oil inlet port 505.

[0029] The push plate unloading oil outlet 509 and the push plate reset oil outlet 510 are respectively connected with the rodless cavity and the rod cavity of the push plate oil cylinder 6. When high-pressure oil flows out from the push plate unloading oil outlet 509, the push plate oil cylinder 6 piston rod can be driven to extend, and the push plate can be controlled to push and unload. When high-pressure oil flows out from the push plate reset oil outlet 510, the push plate oil cylinder 6 piston rod can be driven to retract, and the push plate can be controlled to reset. At this time, the oil in the rodless cavity of the push plate oil cylinder 6 is discharged in sequence through the push plate unloading oil outlet 509 and the first oil inlet 505.

[0030] The first one-way adjustable flow valve 501 and the second one-way adjustable flow valve 502 are connected in sequence between the first oil inlet 505 and the tailgate opening oil outlet 507 in the sequence valve group 5, and the installation directions of the two are opposite, and they are respectively used for adjusting the flow rate of the oil inlet and the oil return.

[0031] Specifically, when the oil flows from the first oil inlet 505 to the tailgate opening oil outlet 507, the flow rate of the oil can be controlled by adjusting the throttling area of the first one-way adjustable flow valve 501, so as to control the opening speed of the tailgate. Similarly, when the oil flows from the tailgate opening oil outlet 507 to the first oil inlet 505, the closing speed of the tailgate can be controlled by adjusting the throttling area of the second one-way adjustable flow valve 502.

[0032] The first oil inlet 505 and the push plate unloading oil outlet 509 are connected with the main sequence valve 503. The control end of the main sequence valve 503 is connected with the control sequence valve 504, and the oil outlet of the control sequence valve 504 is connected with the hydraulic oil tank 1. When the oil pressure in the sequence valve group 5 rises to the set opening pressure of the control sequence valve 504, the control sequence valve 504 spool shifts, so that the passage between the control end of the main sequence valve 503 and the hydraulic oil tank 1 is opened. At this time, the oil in the control end of the main sequence valve 503 flows back to the hydraulic oil tank 1 through the oil outlet of the control sequence valve 504, the pressure in the control end of the main sequence valve 503 instantaneously decreases to 0MPa, the spool of the main sequence valve 503 opens under the action of the inlet pressure, and the oil flows into the rodless cavity of the push plate oil cylinder 6 from the first oil inlet 505 through the main sequence valve 503 and the push plate unloading oil outlet 509, so as to control the piston rod of the push plate oil cylinder 6 to extend.

[0033] The return oil filter 8 is further arranged on the return oil pipeline of the hydraulic oil tank 1, which filters the hydraulic oil after completing the work cycle, maintains the cleanliness of the hydraulic oil, and improves the reliability of the system.

[0034] In order to facilitate the operation of the driver, an operation button is arranged in the cab of the underground mine car. The operation button sends instructions through the control system, so that the hydraulic control system completes the unloading and resetting actions.

[0035] An underground mine car push-unloading type unloading control method is realized based on the above control system, and the specific steps are as follows: S1, start the engine of the underground mine car, drive the hydraulic pump 3 to work, extract hydraulic oil from the hydraulic oil tank 1 to provide oil basis for the system; S2, the driver presses the unloading operation button, opens the control oil port 401, and the oil is transported from the control oil port 401 to the first oil inlet 505 of the sequence valve group 5; In step S2, the specific steps of opening the control oil port 401 are: the control system controls the electromagnetic valve of the reversing valve group 4 to be energized, the spool of the reversing valve group 4 is switched to the unloading station, and the control oil port 401 is opened; S3, the oil flows out from the tailgate opening oil outlet 507, enters the rodless cavity of the tailgate oil cylinder 7, pushes the piston rod of the tailgate oil cylinder 7 to extend, and then pushes the tailgate to open; In step S3, the control sequence valve 504 is in a closed state, and the control end of the main sequence valve 503 has pressure, so that the oil cannot pass through the main sequence valve 503. Therefore, the oil flows out from the tailgate opening oil outlet 507 after sequentially passing through the first one-way adjustable flow valve 501 and the second one-way adjustable flow valve 502. The driver can control the opening speed of the tailgate by adjusting the throttling area of the first one-way adjustable flow valve 501 according to the actual working conditions such as the size of the ore particles. For example, when the ore particles are large, the speed of opening the tailgate needs to be increased to avoid the ore being stuck at the tailgate; In step S3, the residual oil in the rod cavity of the tailgate oil cylinder 7 is discharged through the tailgate closing oil outlet 508 and the second oil inlet 506 in sequence, providing space for the extension of the piston rod of the tailgate oil cylinder 7; S4, after the piston rod of the tailgate oil cylinder 7 extends to the maximum stroke, the oil continues to enter the rodless cavity of the tailgate oil cylinder 7, and the pressure in the cavity rises to the set opening pressure of the control sequence valve 504. When the spool of the control sequence valve 504 is transposed, the spool of the main sequence valve 503 is opened; In step S4, the specific steps of opening the main sequence valve 503 are: after the spool of the control sequence valve 504 is transposed, the oil at the control end of the main sequence valve 503 flows back to the hydraulic oil tank 1 through the oil outlet of the control sequence valve 504, the pressure at the control end of the main sequence valve 503 instantaneously decreases to 0MPa, and the spool of the main sequence valve 503 is opened under the action of the inlet pressure, preparing for the push plate action; S5, after the main sequence valve 503 is opened, the high-pressure oil at the first oil inlet 505 flows into the rodless cavity of the push plate oil cylinder 6 through the oil outlet of the main sequence valve 503, pushes the piston rod of the push plate oil cylinder 6 to extend, and then pushes the ore to fall from the tailgate; In step S5, the residual oil in the rod cavity of the push plate oil cylinder 6 is discharged through the push plate reset oil outlet 510 and the second oil inlet 506 in sequence, ensuring the smooth extension of the piston rod of the push plate oil cylinder 6; S6, after the ore is completely unloaded, the driver presses the reset operation button, the control system controls the other group of electromagnetic valves of the reversing valve group 4 to be electrified, so that the spool of the reversing valve group 4 is switched to the reset station, the reset control oil port 402 is opened, and the oil is transported from the reset control oil port 402 to the second oil inlet port 506 of the sequence valve group 5; S7, the oil flowing from the second oil inlet port 506, part of which enters the rod cavity of the push plate oil cylinder 6 through the push plate reset oil outlet port 510, drives the piston rod of the push plate oil cylinder 6 to retract, controls the push plate to reset; another part enters the rod cavity of the tail door oil cylinder 7 through the tail door closing oil outlet port 508, drives the piston of the tail door oil cylinder 7 to retract, controls the tail door to close; In step S7, the oil in the rodless cavity of the push plate oil cylinder 6 flows through the push plate unloading oil outlet port 509, the main sequence valve 503, the control sequence valve 504 and the first oil inlet port 505 in sequence to be discharged; the oil in the rodless cavity of the tail door oil cylinder 7 flows through the tail door opening oil outlet port 507, the second one-way adjustable flow valve 502, the first one-way adjustable flow valve 501 and the first oil inlet port 505 in sequence to be discharged, by adjusting the throttling area of the second one-way adjustable flow valve 502, the closing speed of the tail door is adjusted, so that the closing speed of the tail door is adapted to the resetting speed of the push plate, and the tail door is prevented from closing too fast and interfering with the push plate; S8, after the push plate oil cylinder 6 and the tail door oil cylinder 7 are reset to the position, the control system sends a signal to stop the hydraulic pump 3, and the electromagnetic valve of the reversing valve group 4 is de-energized, the spool is reset to the middle position, the delivery of high-pressure oil is cut off, and the whole unloading control process is completed.

[0036] For those skilled in the art, according to the teachings of the present application, the changes, modifications, replacements and variations made to the embodiments without departing from the principles and spirits of the present application still fall within the protection scope of the present application.

Claims

1. An underground mine car push-off unloading control system, comprising a hydraulic oil tank (1), a hydraulic pump (3) connected to the oil outlet of the hydraulic oil tank (1), a reversing valve group (4) and a sequence valve group (5) connected to the oil outlet of the hydraulic pump (3) in sequence, characterized in that: The reversing valve group (4) is provided with an opening control oil port (401) and a reset control oil port (402), the sequence valve group (5) is provided with a first oil inlet (505) and a second oil inlet (506), the first oil inlet (505) and the second oil inlet (506) are connected with the opening control oil port (401) and the reset control oil port (402) respectively, and a plurality of oil outlets of the sequence valve group (5) are connected with the push plate oil cylinder (6) and the tail door oil cylinder (7) respectively.

2. An underground mine car push-off unloading control system as defined in claim 1 wherein: The sequence valve group (5) is provided with a tail door opening oil outlet (507), a tail door closing oil outlet (508), a push plate unloading oil outlet (509) and a push plate reset oil outlet (510), wherein the tail door opening oil outlet (507) and the tail door closing oil outlet (508) are connected with the rodless cavity and the rod cavity of the tail door oil cylinder (7) respectively, and the push plate unloading oil outlet (509) and the push plate reset oil outlet (510) are connected with the rodless cavity and the rod cavity of the push plate oil cylinder (6) respectively.

3. An underground mine car push-off unloading control system as defined in claim 2 wherein: The first oil inlet (505) and the tail door opening oil outlet (507) in the sequence valve group (5) are connected with the first one-way adjustable flow valve (501) and the second one-way adjustable flow valve (502) in sequence, and the installation directions of the two are opposite.

4. An underground mine car push-off unloading control system as defined in claim 3 wherein: The hydraulic oil tank (1) and the hydraulic pump (3) are connected with the oil suction filter (2), and the hydraulic oil tank (1) is further provided with an oil return filter (8) on the oil return pipeline.

5. A push-off discharge control method for an underground mine car, implemented by the push-off discharge control system for an underground mine car according to claim 4, characterized by, The specific steps are as follows: S1, start the engine of the underground mine car, drive the hydraulic pump (3) to work, and extract hydraulic oil from the hydraulic oil tank (1) to provide oil basis for the system; S2, the driver presses the unloading operation button, the opening control oil port (401) is opened, and the oil is transported from the opening control oil port (401) to the first oil inlet (505) of the sequence valve group (5); S3, the oil flows out from the tail door opening oil outlet (507) and enters the rodless cavity of the tail door oil cylinder (7), the piston rod of the tail door oil cylinder (7) is pushed out, and then the tail door is opened; S4, after the piston rod of the tail door oil cylinder (7) is stretched to the maximum stroke, the oil continues to enter the rodless cavity of the tail door oil cylinder (7), the pressure in the cavity rises to the set opening pressure of the control sequence valve (504), the valve core of the control sequence valve (504) is transposed, and the valve core of the main sequence valve (503) is opened; S5, after the main sequence valve (503) is opened, the high-pressure oil of the first oil inlet (505) flows into the rodless cavity of the push plate oil cylinder (6) through the oil outlet of the main sequence valve (503), the piston rod of the push plate oil cylinder (6) is pushed out, and then the ore is pushed to fall from the tail door; S6, after the ore is completely unloaded, the driver presses the reset operation button, the control system controls the other group of electromagnetic valves of the reversing valve group (4) to be electrified, the valve core of the reversing valve group (4) is switched to the reset station, the reset control oil port (402) is opened, and the oil is transported from the reset control oil port (402) to the second oil inlet (506) of the sequence valve group (5). S7, the oil flowing from the second oil inlet (506) is partially discharged into the rod cavity of the push plate oil cylinder (6) through the push plate reset oil outlet (510) to retract the piston rod of the push plate oil cylinder (6) and control the push plate to reset; the other part is discharged into the rod cavity of the tail gate oil cylinder (7) through the tail gate closing oil outlet (508) to retract the piston of the tail gate oil cylinder (7) and control the tail gate to close; S8, after the push plate oil cylinder (6) and the tail gate oil cylinder (7) are reset to the position, the control system sends a signal to stop the hydraulic pump (3) from running, and at the same time, the electromagnetic valve of the reversing valve group (4) is de-energized, and the valve core is reset to the middle position to cut off the delivery of high-pressure oil.

6. A push-off discharge control method for an underground mine car according to claim 5, characterized in that: In step S2, the specific steps of opening the control oil port (401) are that the control system controls the electromagnetic valve of the reversing valve group (4) to be energized, the valve core of the reversing valve group (4) is switched to the unloading station, and the control oil port (401) is opened.

7. A push-off discharge control method for an underground mine car according to claim 5, characterized in that: In step S3, the oil flows out from the tail gate opening oil outlet (507) after passing through the first one-way adjustable flow valve (501) and the second one-way adjustable flow valve (502) in sequence, and the opening speed of the tail gate is controlled by adjusting the throttling area of the first one-way adjustable flow valve (501).

8. A push-off discharge control method for an underground mine car according to claim 5, characterized by: In step S4, the specific steps of opening the main sequence valve (503) are that after the valve core of the control sequence valve (504) is switched, the oil at the control end of the main sequence valve (503) flows back to the hydraulic oil tank (1) through the oil outlet of the control sequence valve (504), the pressure at the control end of the main sequence valve (503) is instantaneously reduced to 0MPa, and the valve core of the main sequence valve (503) is opened under the action of the inlet pressure.

9. A push-off discharge control method for an underground mine car according to claim 5, wherein: In step S3, the residual oil in the rod cavity of the tail gate oil cylinder (7) is discharged in sequence through the tail gate closing oil outlet (508) and the second oil inlet (506); in step S5, the residual oil in the rod cavity of the push plate oil cylinder (6) is discharged in sequence through the push plate reset oil outlet (510) and the second oil inlet (506).

10. A push-off discharge control method for an underground mine car according to claim 5, wherein: In step S7, the oil in the rodless cavity of the push plate oil cylinder (6) is discharged in sequence through the push plate unloading oil outlet (509), the main sequence valve (503), the control sequence valve (504) and the first oil inlet (505); the oil in the rodless cavity of the tail gate oil cylinder (7) is discharged in sequence through the tail gate opening oil outlet (507), the second one-way adjustable flow valve (502), the first one-way adjustable flow valve (501) and the first oil inlet (505), and the throttling area of the second one-way adjustable flow valve (502) is controlled to adjust the closing speed of the tail gate.

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