Mine water spraying vehicle spraying control device and control method thereof

Abstract

The application discloses a mine water spraying vehicle spraying control device, comprising a hydraulic oil tank, a double pump, a control valve group, a driving motor and a controller, wherein the double pump is used for providing pressure oil to the control valve group, the control valve group is used for providing the driving motor with pressure oil of constant pressure, the driving motor is used for forming torque from the pressure oil and outputting, the controller receives a set rotating speed signal and an actual rotating speed signal output by a speed control knob, forms a rotating speed control signal according to the actual rotating speed signal and the set rotating speed signal, sends the rotating speed control signal to a control end of a proportional control valve of the driving motor, and controls the opening degree of the proportional control valve of the driving motor. The application further discloses a mine water spraying vehicle spraying control method. The application makes the rotating speed of the driving motor only controlled by the motor speed control knob and not affected by the change of the engine rotating speed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mine water spraying vehicle, and particularly relates to a mine water spraying vehicle spraying control device and a control method thereof. BACKGROUND

[0002] The mine water spraying vehicle is an engineering vehicle specially used for mine operation, and mainly functions to spray water at a mine operation site to reduce dust and lower the concentration of particulate matters in the air, thereby protecting the health of miners and the surrounding environment. In addition to being equipped with a mine dump truck chassis, the mine water spraying vehicle is usually equipped with a water tank, a water pump, a nozzle and a spraying system, so that spraying operation can be conveniently performed.

[0003] Since the hydraulic motor of the mine water spraying vehicle is directly connected to the engine, the power of the hydraulic motor is taken from the engine. When the mine water spraying vehicle is downhill, the engine works in a low speed range, and the rotation speed of the hydraulic motor driving the water pump is also low, resulting in a relatively narrow spraying width. When the mine water spraying vehicle is uphill, the engine works in a high speed range, and the rotation speed of the hydraulic motor driving the water pump is also high, resulting in a relatively wide spraying width. Therefore, the water pump and the spraying control device of the mine water spraying vehicle cannot make the spraying effect uniform and efficient on the mine road, greatly affecting the coverage area and the spraying effect. SUMMARY

[0004] The purpose of the present application is to provide a mine water spraying vehicle spraying control device and a control method thereof, so that the rotation speed of the driving motor is only controlled by the motor speed control knob and is not affected by the change of the engine rotation speed.

[0005] The technical solution is as follows:

[0006] The mine water spraying vehicle spraying control device comprises a hydraulic oil tank, a duplex pump, a control valve group, a driving motor and a controller.

[0007] The hydraulic oil tank is used to receive hydraulic oil.

[0008] The duplex pump is driven by the engine and is used to provide pressure oil to the control valve group. The suction port of the duplex pump is connected to the hydraulic oil tank through a hydraulic pipeline. The first oil outlet and the second oil outlet of the duplex pump are respectively connected to the first main oil inlet and the second main oil inlet of the control valve group through hydraulic pipelines.

[0009] The control valve group is used to provide constant pressure oil to the driving motor. The oil outlet of the control valve group is connected to the oil inlet of the driving motor through a hydraulic pipeline. The oil return port of the control valve group is connected to the oil outlet of the driving motor through a hydraulic pipeline. The oil return port of the control valve group is connected to the oil discharge port through an oil path in the valve group. The oil discharge port and the oil overflow port of the control valve group are respectively connected to the hydraulic oil tank through hydraulic pipelines.

[0010] The drive motor for forming pressure oil into torque and outputting comprises: a rotating speed sensor, a drive motor proportional control valve and a rotor; the rotating speed sensor is used for feeding back an actual rotating speed signal of the drive motor to a controller; the drive motor proportional control valve is used for adjusting the rotating speed of the drive motor; and the rotor is used for forming pressure oil into torque.

[0011] The controller receives a set rotating speed signal output by a speed control knob and an actual rotating speed signal, forms a rotating speed control signal according to the actual rotating speed signal and the set rotating speed signal, and sends the rotating speed control signal to a control end of the drive motor proportional control valve to control the opening degree of the drive motor proportional control valve.

[0012] Further, the input port and the output port of the rotor are connected to the oil inlet and the oil outlet of the drive motor through a motor internal oil circuit respectively; the drive motor proportional control valve controls the rotating speed of the drive motor by adjusting the swash plate swing angle of the drive motor; and the front and rear two groups of displacement of the double pump are not the same.

[0013] Further, the double pump and the control valve group are connected with a first filter and a second filter; the first oil outlet of the double pump is connected with the inlet of the first filter; the second oil outlet of the double pump is connected with the inlet of the second filter; the outlet of the first filter is connected with the first main oil inlet of the control valve group; and the outlet of the second filter is connected with the second main oil inlet of the control valve group.

[0014] Further, the control valve group is a combined valve block, comprising: a first one-way valve, a second one-way valve, a safety valve group, a cut-off valve group and an unloading valve.

[0015] The first one-way valve and the second one-way valve are used for transmitting pressure oil to the input ports of the safety valve group and the cut-off valve group through an internal oil circuit of the valve group; the first main oil inlet is connected with the one-way valve input port of the first one-way valve through the internal oil circuit of the valve group; the second main oil inlet is connected with the input port of the second one-way valve through the internal oil circuit of the valve group; and the output ports of the first one-way valve and the second one-way valve are connected with the input ports of the safety valve group, the cut-off valve group and the unloading valve through the internal oil circuit of the valve group.

[0016] The safety valve group is used for maintaining the oil pressure of the input port of the cut-off valve group; the output port of the safety valve group is connected with the oil discharge port of the control valve group through the internal oil circuit of the valve group; when the pressure of the internal oil circuit of the valve group is higher than a set value, the output port and the input port are conducted to guide pressure oil into a hydraulic oil tank through the oil discharge port;

[0017] The cut-off valve group is used for providing pressure oil to the oil inlet of the drive motor; and the output port of the unloading valve is connected with the oil outlet of the control valve group through the internal oil circuit of the valve group.

[0018] The unloading valve is used for unloading the second oil outlet of the double pump; the output port of the unloading valve is connected with the unloading port of the control valve group through the oil circuit in the valve group; the input port of the unloading valve is connected with the second main oil inlet through the oil circuit in the valve group; and the control port of the unloading valve is connected with the input port of the safety valve group through the oil circuit in the valve group.

[0019] Further, the safety valve group is a two-way plug-in valve group, comprising: a safety valve group valve seat, a safety valve group valve core, a safety valve group valve core damping hole, a safety valve group valve core return spring, a safety valve group valve core control oil damping hole, a safety valve group overflow valve and a safety valve group electromagnetic valve; the safety valve group valve seat is provided with an input port, an output port and a control oil port; the safety valve group valve core is installed on the safety valve group valve seat and located between the input port and the control oil port; the safety valve group valve core is provided with a valve core through hole; the safety valve group valve core return spring is installed on the top of the safety valve group valve core; the safety valve group valve core damping hole is arranged in the valve core through hole; the control oil port is connected with the input port of the safety valve group overflow valve and the safety valve group electromagnetic valve through the oil circuit in the valve group respectively; the safety valve group valve core control oil damping hole is arranged at the outlet of the control oil port; the output port of the safety valve group overflow valve and the working return oil port of the safety valve group electromagnetic valve are connected with the overflow oil port through the oil circuit in the valve group respectively; the safety valve group overflow valve and the safety valve group electromagnetic valve are stacked and installed on the cover plate of the safety valve group.

[0020] Further, the cut-off valve group is a two-way plug-in valve group, comprising: a cut-off valve group valve seat, a cut-off valve group valve core, a cut-off valve group return spring, a cut-off valve group valve core control damping hole, a cut-off valve group electromagnetic valve and a cut-off valve group control oil damping hole; the cut-off valve group valve seat is provided with an input port, an output port and a control oil port; the output ports of the first and second one-way valves are connected with the input port of the cut-off valve group through the oil circuit in the valve group; the output port of the cut-off valve group is connected with the working oil outlet of the control valve group through the oil circuit in the valve group; the cut-off valve group valve core is installed on the cut-off valve group valve seat and located between the input port and the control oil port; the cut-off valve group return spring is installed on the top of the cut-off valve group valve core; the cut-off valve group electromagnetic valve and the cut-off valve group control oil damping hole are stacked and installed on the cover plate of the cut-off valve group; the control oil port of the cut-off valve group is connected with the first output port of the cut-off valve group electromagnetic valve through the oil circuit in the valve group; the cut-off valve group valve core control damping hole is arranged on the oil circuit in the valve group between the control oil port and the first output port of the cut-off valve group electromagnetic valve; the input port of the cut-off valve group valve seat is connected with the first input port of the cut-off valve group electromagnetic valve through the oil circuit in the valve group; the cut-off valve group control oil damping hole is connected on the oil circuit in the valve group between the input port of the cut-off valve group valve seat and the first input port of the cut-off valve group valve seat; the second output port of the cut-off valve group electromagnetic valve is connected with the overflow oil port through the oil circuit in the valve group; and the second input port is connected with the control oil port through the oil circuit in the valve group.

[0021] The mine sprinkler spraying control method comprises:

[0022] The vehicle is in starting state, the engine drives the double pump to rotate, the pressure oil outputted from the first oil outlet of the double pump reaches the first main oil inlet of the control valve group, the pressure oil outputted from the second oil outlet of the double pump reaches the second main oil inlet, no oil pressure exists in the control valve group, the double pump and the engine are not under load;

[0023] The vehicle is in pressure establishing state, pressure oil exists in the control port of the safety valve group and the cut-off valve group, the safety valve group keeps the oil pressure of the pressure oil constant;

[0024] The vehicle is in working state, the pressure oil is outputted from the oil outlet of the control valve group to the oil inlet of the drive motor, the drive motor drives the water pump to rotate, the back oil of the drive motor flows back to the back oil port of the control valve group and then returns to the hydraulic oil tank through the unloading port;

[0025] When the vehicle is in pressure unloading state, the pressure value of the input port of the safety valve group is greater than the pressure setting value of the unloading valve, the unloading valve is in conduction state between the input port and the output port, and the oil in the second oil outlet of the double pump is unloaded to the hydraulic oil tank; when the vehicle is in speed adjusting state, the speed of the drive motor is adjusted through the speed control knob, and the drive motor proportional control valve makes the speed of the drive motor faster.

[0026] Preferably, in the starting state of the vehicle, the pressure oil enters the input port of the safety valve group through the first main oil inlet and the first check valve, and the pressure oil enters the input port of the safety valve group through the second filter and the second check valve; the pressure oil at the input port of the safety valve group enters the input port of the safety valve group electromagnetic valve through the safety valve group valve core damping hole and the safety valve group valve core control oil damping hole on the safety valve group valve core, the safety valve group electromagnetic valve is in non-electric state, the input port and the output port of the safety valve group electromagnetic valve are in conduction state, and the pressure of the control port of the safety valve group valve core is 0; the pressure oil at the input port of the safety valve group pushes the safety valve group valve core to move upward, the input port and the output port of the safety valve group are in conduction state, and the pressure oil at the input port flows back to the hydraulic oil tank through the output port and the unloading port.

[0027] Preferably, the vehicle is in the pressure establishing state, the safety valve group solenoid valve is in the energized state, the hydraulic oil is prevented from flowing back to the hydraulic oil tank, the control port of the safety valve group exists pressure oil, the safety valve group overflow valve maintains the control port pressure, if the control port pressure exceeds the set value, the input port and the output port of the safety valve group overflow valve are conducted, the excessive hydraulic oil flows back to the hydraulic oil tank through the overflow port, and the oil pressure at the control port of the safety valve group is maintained at the set value, if the input port pressure of the safety valve group spool exceeds the set value, the hydraulic oil pushes the safety valve group spool to go up, the input port and the output port of the safety valve group spool are conducted, the hydraulic oil flows back to the hydraulic oil tank through the unloading port of the control valve group, and the oil pressure at the input port of the safety valve group is maintained at the set value, at this time, the cut-off valve group solenoid valve is in the de-energized state, the pressure oil at the input port of the cut-off valve group enters the input port of the cut-off valve group solenoid valve through the cut-off valve group control oil damping hole, and the cut-off valve group spool is in the closed position, when the pressure at the second main oil inlet is greater than the pressure set value of the unloading valve, the input port and the output port of the unloading valve are conducted, the hydraulic oil flows back to the hydraulic oil tank through the unloading port of the control valve group, the cut-off valve group solenoid valve is in the energized state, the input port and the output port are conducted, and the control oil port maintains 0 oil pressure, there is a pressure difference between the control oil port and the input port of the cut-off valve group, the hydraulic oil at the input port pushes the cut-off valve group spool to move, the input port and the output port of the cut-off valve group are conducted, and the pressure oil at the input port is transmitted to the oil outlet of the control valve group.

[0028] Preferably, the vehicle is in the pressure establishing state, the safety valve group solenoid valve is in the energized state, the cut-off valve group solenoid valve is in the energized state, the safety valve group is in the pressure establishing state, the cut-off valve group is in the open state, the pressure oil at the input port of the cut-off valve group is output to the oil inlet of the drive motor through the oil outlet of the control valve group, the drive motor drives the water pump to rotate, and the oil return of the drive motor flows back to the hydraulic oil tank through the oil return port; the vehicle is in the pressure unloading state, the engine is in the high-speed state, the double pump is in the high-speed state, when the input port pressure of the safety valve group is greater than the pressure set value of the unloading valve, the unloading valve conducts the input port and the output port, and all the oil at the second oil outlet of the double pump is unloaded back to the hydraulic oil tank; the pressure of the first main oil inlet rises, the input port pressure of the safety valve group rises, if the control port pressure of the safety valve group exceeds the set value, the input port and the output port of the safety valve group overflow valve are conducted, the excessive hydraulic oil flows back to the hydraulic oil tank through the overflow port of the control valve group, and the oil pressure at the control port of the safety valve group is maintained at the set value.

[0029] The technical effects of the present application include:

[0030] The present application makes the drive motor speed of the water pump of the watering vehicle only controlled by the motor speed control knob in the cab, and is not affected by the change of the engine speed, thereby effectively improving the stability of the watering operation width of the watering vehicle.

[0031] The application uses a large-capacity duplex pump to provide hydraulic oil for a proportional motor to drive a water pump, realizes constant speed control of the water pump of the watering truck, makes the spraying effect uniform and efficient, greatly improves the coverage area and spraying effect of spraying, and the watering truck can also adjust the water amount and spraying range of spraying according to actual conditions to meet different operation requirements. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the structural principle diagram of the spraying control device of the mine watering truck in the application. DETAILED DESCRIPTION

[0033] The following description fully shows the specific implementation of the application to enable those skilled in the art to practice and reproduce.

[0034] The spraying control device of the mine watering truck comprises a hydraulic oil tank 1, a duplex pump 2, a control valve group 6, a driving motor 7 and a controller 9.

[0035] The duplex pump 2 is driven by an engine 3 and is used for providing pressure oil; the oil suction port of the duplex pump 2 is connected with the hydraulic oil tank 1 through a hydraulic pipeline, the first oil outlet of the duplex pump 2 is connected with the first main oil inlet (P1 port) of the control valve group 6 through a hydraulic pipeline, and the second oil outlet is connected with the second main oil inlet (P2 port) of the control valve group 6 through a hydraulic pipeline; the front and rear duplexes of the duplex pump 2 are not the same, and the front duplex is about 3 times of the rear duplex.

[0036] The first filter 4 and the second filter 5 are connected between the duplex pump 2 and the control valve group 6, the first oil outlet of the duplex pump 2 is connected with the inlet of the first filter 4, and the second oil outlet of the duplex pump 2 is connected with the inlet of the second filter 5; the outlet of the first filter 4 is connected with the first main oil inlet (P1 port) of the control valve group 6, and the outlet of the second filter 5 is connected with the second main oil inlet (P2 port) of the control valve group 6.

[0037] The oil outlet (A port) of the control valve group 6 is connected with the oil inlet (A1 port) of the driving motor 7 through a hydraulic pipeline, the oil return port (B port) of the control valve group 6 is connected with the oil outlet (B1 port) of the driving motor 7 through a hydraulic pipeline, the oil return port (B port) of the control valve group 6 is connected with the oil discharge port (T port) through the oil circuit in the valve group, and the oil discharge port (T port) and the oil overflow port (T1) are respectively connected with the hydraulic oil tank 1 through hydraulic pipelines. The P1 port, the P2 port, the A port and the B port are respectively provided with pressure sensors MP1, MP2, MA and MB, and the input port of the safety valve group 63 and the cut-off valve group 64 is provided with a pressure sensor MP.

[0038] The control valve group 6 is a combined valve block for providing pressure oil to the power supply of the driving motor 7, including: a first check valve 61, a second check valve 62, a safety valve group 63, a cut-off valve group 64, and an unloading valve 65. The first check valve 61 and the second check valve 62 are used to deliver pressure oil to the input port (p port) of the safety valve group 63 and the cut-off valve group 64; the safety valve group 63 is used to maintain the oil pressure of the input port (p port) of the cut-off valve group 64; the cut-off valve group 64 is used to provide pressure oil to the A1 port of the driving motor 7; and the unloading valve 65 is used to unload the second oil outlet of the double pump 2.

[0039] The safety valve group 63 is a two-way plug-in valve group. When the oil pressure in the valve group is higher than the set value, the output port (t port) and the input port (p port) are connected, and the pressure oil is introduced into the hydraulic oil tank 1 through the oil discharge port (T port). The first main oil inlet port (P1 port) is connected to the check valve input port of the first check valve 61 through the oil passage in the valve group, the second main oil inlet port (P2 port) is connected to the input port of the second check valve 62 through the oil passage in the valve group, the output ports of the first check valve 61 and the second check valve 62 are connected to the input port (p port) of the safety valve group 63 and the cut-off valve group 64 through the oil passage in the valve group, and the output port (t port) of the safety valve group 63 is connected to the oil discharge port (T port) of the control valve group 6.

[0040] The safety valve group 63 includes: a safety valve group valve seat 631, a safety valve group valve core 632, a safety valve group valve core damping hole 633, a safety valve group valve core return spring 634, a safety valve group valve core control oil damping hole 635, a safety valve group overflow valve 636, and a safety valve group solenoid valve 637. The input port (p port) is arranged at the lower part of the safety valve group valve seat 631, the output port (t port) is arranged at the side part, and the control oil port (x port) is arranged at the upper part. The safety valve group valve core 632 is installed on the safety valve group valve seat 631 and located between the input port (p port) and the control oil port (x port). The safety valve group valve core 632 is provided with a valve core through hole. The safety valve group valve core return spring 634 is installed at the top of the safety valve group valve core 632, and the safety valve group valve core damping hole 633 is arranged in the valve core through hole. The control oil port (x port) is connected to the input port (p port) of the safety valve group overflow valve 636 and the safety valve group solenoid valve 637 through the oil passage in the valve group, and the safety valve group valve core control oil damping hole 635 is arranged at the outlet of the control oil port (x port). The output port (t port) of the safety valve group overflow valve 636 and the working return oil port (b port) of the safety valve group solenoid valve 637 are connected to the overflow port (T1) through the oil passage in the valve group. The safety valve group overflow valve 636 and the safety valve group solenoid valve 637 are stacked and installed on the cover plate of the safety valve group 63.

[0041] The cut-off valve group 64 is a two-way plug-in valve group, which comprises a cut-off valve group valve seat 641, a cut-off valve group valve core 642, a cut-off valve group return spring 643, a cut-off valve group valve core control damping hole 644, a cut-off valve group solenoid valve 645, and a cut-off valve group control oil damping hole 646. The lower part of the cut-off valve group valve seat 641 is provided with an input port (p port), the side part is provided with an output port (t port), and the upper part is provided with a control oil port (x port). The output ports of the first one-way valve 61 and the second one-way valve 62 are connected with the input port (p port) of the cut-off valve group 64 through the oil path in the valve group, and the output port (t port) of the cut-off valve group 64 is connected with the working oil outlet port (A port) of the control valve group 6 through the oil path in the valve group. The cut-off valve group valve core 642 is installed on the cut-off valve group valve seat 641 and located between the input port (p port) and the control oil port (x port). The cut-off valve group return spring 643 is installed on the top of the cut-off valve group valve core 642. The cut-off valve group solenoid valve 645 and the cut-off valve group control oil damping hole 646 are stacked on the cover plate of the cut-off valve group 13. The control oil port (x port) of the cut-off valve group 64 is connected with the output port (a port) of the cut-off valve group solenoid valve 645 through the oil path in the valve group, and the cut-off valve group valve core control damping hole 644 is arranged on the oil path in the valve group between the x port and the a port. The input port (p port) of the cut-off valve group valve seat 641 is connected with the input port (p port) of the cut-off valve group solenoid valve 645 through the oil path in the valve group, and the cut-off valve group control oil damping hole 646 is connected with the oil path in the valve group between the two p ports. The output port (t port) of the cut-off valve group solenoid valve 645 is connected with the overflow port (T1) through the oil path in the valve group, and the input port (b port) is connected with the control oil port (x port) through the oil path in the valve group.

[0042] The input port of the unloading valve 65 is connected with the second main oil inlet port (P2 port) through the oil path in the valve group, the output port of the unloading valve 65 is connected with the oil discharge port (T port) of the control valve group 6 through the oil path in the valve group, and the control port of the unloading valve 65 is connected with the input port (p port) of the safety valve group 63 through the oil path in the valve group.

[0043] The drive motor 7 comprises a rotational speed sensor 71, a drive motor proportional control valve 72, and a rotor 73. The drive motor 7 is a hydraulic drive motor, which is used to provide power to the water pump 8. The power output end of the drive motor 7 is connected with the rotating shaft of the water pump 8. The rotational speed sensor 71 is installed on the power output end of the drive motor 7, which feeds back the actual rotational speed signal of the drive motor 7 to the controller 9.

[0044] The drive motor proportional control valve 72 controls the rotational speed of the drive motor 7 by adjusting the swash plate swing angle of the drive motor 7. The rotor 73 is used to form torque with working hydraulic oil.

[0045] The driving motor 7 is provided with an oil inlet (A1 port) and an oil outlet (B1 port), the A1 port is connected to the oil outlet (A port) of the control valve group 6 through a hydraulic pipeline, the oil outlet (B1 port) is connected to the oil return port (B port) of the control valve group 6 through a hydraulic pipeline; the input port and the output port of the rotor 73 are connected to the A1 port and the B1 port through the motor internal oil circuit respectively. In addition, the A1 port and the B1 port are connected with the third one-way valve 74 and the driving motor electromagnetic valve 75.

[0046] The controller 9 receives the set rotating speed signal output by the speed control knob arranged in the cab, the rotating speed sensor 71 feeds back the actual rotating speed signal of the driving motor 7, a rotating speed control signal is formed according to the actual rotating speed signal and the set rotating speed signal, the rotating speed control signal is sent to the control end of the driving motor proportional control valve 72, the opening of the driving motor proportional control valve 72 is controlled, and the rotating speed of the driving motor 7 is controlled by the speed control knob.

[0047] The spraying control method of the mine spraying vehicle is as follows:

[0048] (1) The vehicle is in an off state, at this time, the engine 3 stops working, the double pump 2 has no pressure oil output, and the whole vehicle hydraulic system does not work.

[0049] (2) The vehicle is in a starting state, at this time, the engine 3 drives the double pump 2 to rotate, the pressure oil output by the first oil outlet of the double pump 2 reaches the first main oil inlet (P1 port) of the control valve group 6 through the first filter 4, and the pressure oil output by the second oil outlet of the double pump 2 reaches the second main oil inlet (P2 port) through the second filter 5;

[0050] The pressure oil enters the input port (p port) of the safety valve group 63 through the first main oil inlet (P1 port) and the first one-way valve 61, and the pressure oil enters the input port (p port) of the safety valve group 63 through the second filter 5 and the second one-way valve 62;

[0051] The pressure oil at the p port of the safety valve group 63 enters the p port of the safety valve group electromagnetic valve 637 through the safety valve group valve core damping hole 633 and the safety valve group valve core control oil damping hole 635 on the safety valve group valve core 632, the safety valve group electromagnetic valve 637 is in a non-electric state, the p port of the safety valve group electromagnetic valve 637 is in conduction with the b port, and since the b port is connected to the oil tank 1 through the T1 port of the control valve group 6, the pressure of the control oil port (x port) of the safety valve group valve core 632 is 0 at this time; there is a pressure difference between the p port and the x port of the safety valve group 63, the pressure oil at the p port pushes the safety valve group valve core 632 to move upward against the force of the safety valve group valve core return spring 634, the p port and the t port of the safety valve group 63 are in conduction, the pressure oil at the p port returns to the T port of the control valve group 6 through the t port, and the p port of the safety valve group 63 has no pressure oil.

[0052] Because of no oil pressure in the control valve group 6, the duplex pump 2 and the engine 3 are unloaded, which is beneficial to the engine 3 start.

[0053] (3), the vehicle in the establishment of pressure state, at this time the safety valve group electromagnetic valve 637 is in the state of power, the safety valve group electromagnetic valve 637 p and a mouth communication, hydraulic oil is prevented backflow hydraulic oil tank 1; so the safety valve group 63 control oil port (x mouth) exists pressure oil, safety valve group overflow valve 636 keeps x mouth pressure 150 bar, the safety valve group 63 p oil pressure is maintained at about 150 bar (if x mouth pressure exceeds 150 bar, the safety valve group overflow valve 636 p, t mouth conduction, the excess hydraulic oil through the control valve group 6 T1 back to the hydraulic oil tank 1, so that the safety valve group 63 x mouth oil pressure is maintained at about 150 bar; if the safety valve group valve core 63 p pressure increases suddenly, the safety valve group valve core damping hole 633, the safety valve group valve core 63 p, x mouth exists pressure difference, hydraulic oil promotes the safety valve group valve core 632 uplink, the safety valve group valve core 63 p, t mouth conduction, hydraulic oil through the control valve group 6 T back to the hydraulic oil tank 1, keep the safety valve group 63 p oil pressure is maintained at about 150 bar). At this time, the cut-off valve group electromagnetic valve 645 is in the state of power, the cut-off valve group 64 p mouth pressure oil through the cut-off valve group control oil damping hole 646 into the cut-off valve group electromagnetic valve 645 p, p and a mouth conduction, pressure oil through p, a mouth, cut-off valve group valve core control damping hole 644 into the cut-off valve group 64 control port (x mouth), cut-off valve group valve core 642 is in the closed position.

[0054] When the second main oil inlet (P2 mouth) pressure is greater than the pressure setting value of unloading valve 65 145 bar, the input port, output port of unloading valve 65 conduction, hydraulic oil through the control valve group 6 T back to the hydraulic oil tank 1.

[0055] (4), the vehicle in the working state, at this time the safety valve group electromagnetic valve 637 is in the state of power, the cut-off valve group electromagnetic valve 645 is in the state of power, the safety valve group 63 is in the establishment of pressure state, the cut-off valve group 64 is in the open state, the cut-off valve group 64 p mouth pressure oil through the control valve group 6 A mouth output to the A1 mouth of the drive motor 7, the drive motor 7 drives the water pump 8 to rotate, the drive motor 7 back oil through B1 back to the control valve group 6 B mouth, and then through the control valve group 6 T back to the hydraulic oil tank 1.

[0056] The electromagnetic valve 645 of the cut-off valve group is in the powered state, the input port (b port) and the output port (t port) are connected, and the control oil port (x port) maintains 0 oil pressure; there is a pressure difference between the control oil port (x port) and the input port (p port) of the cut-off valve group 64, the hydraulic oil at the p port pushes the spool 642 of the cut-off valve group to move, connects the input port (p port) and the output port (t port) of the cut-off valve group 64, and transmits the pressure oil at the p port to the A port of the control valve group 6.

[0057] (5) When the vehicle is in the pressure unloading state, the engine 3 is in the high speed state when the water sprinkler is working, the double pump 2 is in the high speed state, the p port pressure of the safety valve group 63 also acts on the control port of the unloading valve 65, when the p port pressure of the safety valve group 63 is greater than the pressure setting value 145 bar of the unloading valve 14, the unloading valve 65 connects the input port and the output port, and the oil liquid of the second oil outlet of the double pump 2 is unloaded back to the hydraulic oil tank 1.

[0058] The double pump 2 is in the high speed state, the first oil outlet causes the pressure of the first main oil inlet (P1 port) to rise, and the second oil outlet causes the pressure of the second main oil inlet (P2 port) to rise, and the second oil outlet of the double pump 2 is unloaded through the unloading valve 65, so as to avoid excessive heat generated by the device.

[0059] The P1 port pressure rises, the p port pressure of the safety valve group 63 also rises, if the x port pressure exceeds 150 bar, the p port and the t port of the overflow valve 636 of the safety valve group are connected, the excess hydraulic oil flows back to the hydraulic oil tank 1 through the T1 port of the control valve group 6, so that the oil liquid pressure at the x port of the safety valve group 63 is maintained at about 150 bar. In this way, the p port pressure of the cut-off valve group 64 can be kept stable (145 bar), the A port pressure of the control valve group 6 can be kept stable (145 bar), and then the rotation speed of the drive motor 7 and the drive water pump 8 can be kept stable and is not affected by the change of the rotation speed of the engine 2.

[0060] (6) When the vehicle is in the rotation speed adjusting state, the driver can adjust the rotation speed of the drive motor 7 by adjusting the speed control knob in the cab, when the speed adjusting knob is rotated clockwise, the current output by the speed adjusting knob increases and acts on the drive motor proportional control valve 72, the swash plate angle of the drive motor 7 is reduced, and the rotation speed of the drive motor 7 is increased.

[0061] The terms used in the present application are illustrative and exemplary, but not limiting terms. Since the present application can be embodied in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above examples are not limited to any of the above details, but should be interpreted broadly within the spirit and scope defined by the appended claims, and therefore all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A spraying control device for a mining sprinkler truck, characterized in that: include: Hydraulic oil tank, duplex pump, control valve group, drive motor, controller; Hydraulic oil tank, used to receive hydraulic oil; A double pump, driven by the engine, is used to provide pressurized oil to the control valve group. Its oil suction port is connected to the hydraulic oil tank through a hydraulic pipeline, and its first oil outlet and second oil outlet are connected to the first main oil inlet and second main oil inlet of the control valve group respectively through hydraulic pipelines; The control valve group is used to provide constant pressure oil to the drive motor. Its oil outlet is connected to the oil inlet of the drive motor through a hydraulic pipeline. Its oil return port is connected to the oil outlet of the drive motor through a hydraulic pipeline. Its oil return port is connected to the oil unloading port through the oil circuit in the valve group. Its oil unloading port and oil overflow port are respectively connected to the hydraulic oil tank through hydraulic pipelines; The drive motor is used to convert the pressure oil into torque and output it. It includes: a speed sensor, a drive motor proportional control valve, and a rotor. The speed sensor is used to feed back the actual speed signal of the drive motor to the controller. The drive motor proportional control valve is used to adjust the speed of the drive motor. The rotor is used to convert the pressure oil into torque. The controller receives the set speed signal and the actual speed signal output by the speed control knob, generates a speed control signal according to the actual speed signal and the set speed signal, and sends the speed control signal to the control end of the proportional control valve of the drive motor to control the opening of the proportional control valve of the drive motor; The control valve group is a combined valve block, including: a first one-way valve, a second one-way valve, a safety valve group, a cut-off valve group, and an unloading valve; The first one-way valve and the second one-way valve are used to transfer the pressure oil to the input ports of the safety valve group and the shut-off valve group through the oil circuit in the valve group; the first main oil inlet is connected to the one-way valve input port of the first one-way valve through the oil circuit in the valve group, and the second main oil inlet is connected to the input port of the second one-way valve through the oil circuit in the valve group. The output ports of the first one-way valve and the second one-way valve are both connected to the input ports of the safety valve group, the shut-off valve group, and the unloading valve through the oil circuit in the valve group; The safety valve group is used to maintain the oil pressure at the input port of the cut-off valve group. The safety valve group is a two-way plug-in valve group, including: a safety valve group valve seat, a safety valve group valve core, a safety valve group valve core damping hole, a safety valve group valve core return spring, a safety valve group valve core control oil damping hole, a safety valve group relief valve, and a safety valve group solenoid valve; the safety valve group valve seat is provided with an input port, an output port, and a control oil port; the safety valve group valve core is installed on the safety valve group valve seat and is located between the input port and the control oil port; the safety valve group valve core is provided with a valve core through hole; the safety valve group valve core return spring is installed on the top of the safety valve group valve core, and the safety valve group valve core damping hole is set at The control oil port is connected to the relief valve of the safety valve group and the input port of the solenoid valve of the safety valve group through the oil circuit in the valve group. The control oil damping hole of the valve core of the safety valve group is set at the outlet of the control oil port. The output port of the relief valve of the safety valve group and the working oil return port of the solenoid valve of the safety valve group are connected to the oil overflow port through the oil circuit in the valve group. The relief valve of the safety valve group and the solenoid valve of the safety valve group are superimposed and installed on the cover plate of the safety valve group. The output port of the safety valve group is connected to the oil discharge port of the control valve group through the oil circuit in the valve group. When the oil circuit pressure in the valve group is higher than the set value, the output port and the input port are connected to guide the pressure oil into the hydraulic oil tank through the oil discharge port. The shut-off valve group is used to provide pressure oil to the oil inlet of the driving motor, and the output port of the unloading valve is connected to the oil outlet port of the control valve group through the oil circuit in the valve group; the shut-off valve group is a two-way plug-in valve group, including: a shut-off valve group valve seat, a shut-off valve group valve core, a shut-off valve group reset spring, a shut-off valve group valve core control damping hole, a shut-off valve group solenoid valve, and a shut-off valve group control oil damping hole; the shut-off valve group valve seat is provided with an input port, an output port, and a control oil port; the output ports of the first one-way valve and the second one-way valve are connected to the input port of the shut-off valve group through the oil circuit in the valve group, and the output port of the shut-off valve group is connected to the working oil outlet port of the control valve group through the oil circuit in the valve group; the shut-off valve group valve core is installed on the shut-off valve group valve seat and is located between the input port and the control oil port; the shut-off valve group reset spring Installed on the top of the valve core of the cut-off valve group; the solenoid valve of the cut-off valve group and the control oil damping hole of the cut-off valve group are superimposed and installed on the cover plate of the cut-off valve group; the control oil port of the cut-off valve group is connected to the first output port of the solenoid valve of the cut-off valve group through the oil circuit in the valve group, and the control damping hole of the valve core of the cut-off valve group is arranged on the oil circuit in the valve group between the control oil port and the first output port of the solenoid valve of the cut-off valve group; the input port of the valve seat of the cut-off valve group is connected to the first input port of the solenoid valve of the cut-off valve group through the oil circuit in the valve group, and the control oil damping hole of the cut-off valve group is connected to the oil circuit in the valve group between the input port of the valve seat of the cut-off valve group and the first input port of the valve seat of the cut-off valve group; the second output port of the solenoid valve of the cut-off valve group is connected to the oil overflow port through the oil circuit in the valve group, and the second input port is connected to the control oil port through the oil circuit in the valve group; The unloading valve is used to unload the second oil outlet of the duplex pump; the output port of the unloading valve is connected to the oil unloading port of the control valve group through the oil circuit in the valve group, the input port of the unloading valve is connected to the second main oil inlet through the oil circuit in the valve group, and the control port of the unloading valve is connected to the input port of the safety valve group through the oil circuit in the valve group.

2. The spraying control device for a mining sprinkler truck according to claim 1, characterized in that: The input port and output port of the rotor are connected to the oil inlet and oil outlet of the drive motor respectively through the oil circuit inside the motor. The proportional control valve of the drive motor controls the speed of the drive motor by adjusting the swing angle of the swash plate of the drive motor. The displacement of the front and rear pumps of the duplex pump is different.

3. The spraying control device for a mining sprinkler truck according to claim 1, characterized in that: A first filter and a second filter are connected between the duplex pump and the control valve group. The first oil outlet of the duplex pump is connected to the inlet of the first filter, and the second oil outlet of the duplex pump is connected to the inlet of the second filter; the outlet of the first filter is connected to the first main oil inlet of the control valve group, and the outlet of the second filter is connected to the second main oil inlet of the control valve group.

4. A method for controlling the spraying of a mine sprinkler truck using the spraying control device of any one of claims 1 to 3, characterized in that: include: When the vehicle is in the starting state, the engine drives the double pump to rotate. The pressure oil output from the first oil outlet of the double pump reaches the first main oil inlet of the control valve group, and the pressure oil output from the second oil outlet of the double pump reaches the second main oil inlet. There is no oil pressure in the control valve group, and the double pump and engine are unloaded. When the vehicle is in the pressure-building state, there is pressurized oil at the control ports of the safety valve group and the cut-off valve group, and the safety valve group maintains a constant pressure of the pressurized oil; When the vehicle is in operation, the pressure oil is output to the oil inlet of the drive motor through the oil outlet of the control valve group. The drive motor drives the water pump to rotate. The return oil of the drive motor flows back to the return oil port of the control valve group and then returns to the hydraulic oil tank through the oil unloading port. When the vehicle is in the pressure unloading state and the pressure value of the input port of the safety valve group is greater than the pressure setting value of the unloading valve, the unloading valve connects the input port and the output port to unload the oil from the second oil outlet of the duplex pump back to the hydraulic oil tank; when the vehicle is in the speed adjustment state, the speed of the drive motor is adjusted by the speed control knob, and the drive motor proportional control valve increases the speed of the drive motor.

5. The spraying control method of a mine sprinkler truck according to claim 4, characterized in that: When the vehicle is in the starting state, the pressure oil enters the input port of the safety valve group through the first main oil inlet and the first one-way valve, and the pressure oil enters the input port of the safety valve group through the second filter and the second one-way valve; the pressure oil at the input port of the safety valve group passes through the safety valve group valve core damping hole and the safety valve group valve core control oil damping hole on the safety valve group valve core and enters the input port of the safety valve group solenoid valve, the safety valve group solenoid valve is in a power-off state, the input port and output port of the safety valve group solenoid valve are connected, and the pressure of the control port of the safety valve group valve core is 0; the pressure oil at the input port of the safety valve group pushes the safety valve group valve core to move upward, the input port and output port of the safety valve group are connected, and the pressure oil at the input port returns to the hydraulic oil tank through the output port and the oil unloading port.

6. The method for controlling the spraying of a mine sprinkler truck according to claim 4, wherein: When the vehicle is in the pressure-building state, the solenoid valve of the safety valve group is in the energized state, and the hydraulic oil is prevented from flowing back to the hydraulic oil tank; there is pressurized oil in the control port of the safety valve group, and the relief valve of the safety valve group maintains the pressure of the control port; if the pressure of the control port exceeds the set value, the input and output ports of the relief valve of the safety valve group are connected, and the excess hydraulic oil returns to the hydraulic oil tank through the overflow port, so that the oil pressure at the control port of the safety valve group is maintained at the set value; if the input port pressure of the valve core of the safety valve group exceeds the set value, the hydraulic oil pushes the valve core of the safety valve group upward, connecting the input and output ports of the valve core of the safety valve group, and the hydraulic oil returns to the hydraulic oil tank through the oil unloading port of the control valve group, so that the oil pressure at the input port of the safety valve group is maintained at the set value; at this time, When the solenoid valve of the shut-off valve group is in a de-energized state, the pressure oil at the input port of the shut-off valve group enters the input port of the solenoid valve of the shut-off valve group through the control oil damping hole of the shut-off valve group, and the valve core of the shut-off valve group is in a closed position; when the pressure at the second main oil inlet is greater than the pressure setting value of the unloading valve, the input port and output port of the unloading valve are connected, and the hydraulic oil returns to the hydraulic oil tank through the unloading port of the control valve group; the solenoid valve of the shut-off valve group is in a energized state, the input port and output port are connected, and the control oil port maintains 0 oil pressure; there is a pressure difference between the control oil port and the input port of the shut-off valve group, and the hydraulic oil at the input port pushes the valve core of the shut-off valve group to move, connecting the input port and output port of the shut-off valve group, and transmitting the pressure oil at the input port to the oil outlet of the control valve group.

7. The method for controlling the spraying of a mine sprinkler truck according to claim 4, wherein: When the vehicle is in operation, the solenoid valve of the safety valve group is energized, the solenoid valve of the shut-off valve group is energized, the safety valve group is in a pressure-building state, and the shut-off valve group is in an open state. The pressure oil at the input port of the shut-off valve group is output to the oil inlet of the drive motor through the oil outlet of the control valve group. The drive motor drives the water pump to rotate, and the return oil of the drive motor flows back to the hydraulic oil tank through the return oil port. When the vehicle is in a pressure unloading state, the engine is in a high speed state, and the duplex pump is in a high speed state. When the pressure value of the input port of the safety valve group is greater than the pressure setting value of the unloading valve, the unloading valve opens the input port and output port, unloading all the oil in the second oil outlet of the duplex pump back to the hydraulic oil tank. When the pressure of the first main oil inlet increases, the pressure of the input port of the safety valve group increases accordingly. If the pressure of the control port of the safety valve group exceeds the set value, the input port and output port of the relief valve of the safety valve group are opened, and the excess hydraulic oil flows back to the hydraulic oil tank through the relief port of the control valve group, so that the oil pressure at the control port of the safety valve group is maintained at the set value.

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