Load-sensitive double-pump multi-way reversing valve of underground drill rig

Abstract

A load-sensitive double-pump multi-way reversing valve of an underground drill rig comprises an oil inlet valve plate, a rotary valve plate, a control valve plate, an auxiliary oil inlet valve plate and a feeding valve plate, a main oil inlet is formed in the oil inlet valve plate, an auxiliary oil inlet is formed in the auxiliary oil inlet valve plate, a working port is formed in the rotary valve plate, and a rotary reversing valve and a pressure compensation valve are arranged in the rotary valve plate. A working port and a feed reversing valve are arranged on the feed valve plate; a switching valve plate is arranged between the rotary valve plate and the control valve plate, ports P and P'of the switching valve plate are communicated with the main oil inlet and the auxiliary oil inlet respectively, and a port X of the control end of the switching valve plate is communicated with the rotary reversing valve; a first shuttle valve is arranged in the rotary valve block, a second shuttle valve is arranged in the feeding valve block, one end of the first shuttle valve is communicated with the rotary reversing valve, the other end of the first shuttle valve is communicated with the second shuttle valve, and the output end of the first shuttle valve is communicated with a feedback port LS. According to the reversing valve, the pressure of supplied pressure oil can be automatically adjusted according to the load condition, accurate control over working parameters is achieved, the energy efficiency can be improved, and the system stability is improved.

Description

Technical Field

[0001] The utility model relates to a multi-way directional control valve, in particular to a load-sensitive double-pump multi-way directional control valve for a tunnel drilling rig. Background Technique

[0002] A tunnel drilling rig is a drilling rig used for drilling in underground roadways, mainly for engineering construction such as deep geological exploration, gas drainage, water injection and drainage, and ventilation in roadways. Its main structure is: a power head equipped with a hydraulic chuck is connected to a feed cylinder. The gripper consists of two semi-circular jaws, one jaw is fixed and the other jaw can move. Under the action of disc springs, the two jaws are pressed tightly together. Its working mode is: the handle of the multi-way directional control valve is switched, the power head rotates, the hydraulic chuck clamps the drill pipe and rotates, at the same time the two jaws of the gripper open, loosen the drill pipe, push the handle forward to switch, and under the action of the feed cylinder, the power head advances for drilling; after driving in one drill pipe, push the handle back to the middle position, and the power head stops advancing; rotate the handle back to the middle position, the power head stops rotating, and the two jaws of the gripper clamp the driven drill pipe to prevent it from falling. Add another drill pipe to the tail of the drill pipe, pull the push handle back to switch, the hydraulic chuck loosens, and the power head retreats to the tail, and the drilling is cycled by continuously adding drill pipes. The clamping and opening of the chuck and the clamping and opening of the gripper are all controlled by a control valve group.

[0003] At present, the existing multi-way directional control valves for tunnel drilling rigs generally adopt double-pump oil supply, which solves the problem of unstable control of the hydraulic chuck and gripper during single-pump oil supply. However, this kind of multi-way directional control valve for tunnel drilling rigs has no load-sensitive system, and there are often situations of energy waste caused by excessive oil supply during light loads or insufficient oil supply during heavy loads, which affects the working state.

[0004] In addition, the existing multi-way directional control valves for tunnel drilling rigs can be externally connected with a hydraulic pilot handle to realize the switching between manual and hydraulic control. However, this switching method occupies a large area and is difficult to meet the use requirements in a relatively complex environment. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a load-sensitive double-pump multi-way directional control valve for a tunnel drilling rig, which can automatically adjust the pressure of the pressure oil supplied to the hydraulic motor and the feed cylinder according to the load situation, realize the accurate control of working parameters, not only can avoid the waste of pressure, thereby improving energy efficiency, but also can avoid insufficient pressure affecting the work and improve the system stability.

[0006] The technical solution of the utility model is as follows:

[0007] A load-sensitive dual-pump multi-way directional control valve for a tunnel drilling rig, comprising an inlet valve plate 1, a rotary valve plate 2, a control valve plate 4, a secondary inlet valve plate 5, and a feed valve plate 6 connected in sequence. A main inlet port P1 and a return port T are provided on the inlet valve plate 1, which are respectively used to connect the main pump and the fuel tank of the tunnel drilling rig; a secondary inlet port P2 is provided on the secondary inlet valve plate 5, which is used to connect the secondary pump of the tunnel drilling rig; a working port A1 and a working port B1 are provided on the rotary valve plate 2, and a rotary directional control valve and a pressure compensation valve are installed inside the rotary valve plate 2, which are used to connect and control the hydraulic motor; a working port A2 and a working port B2 are provided on the feed valve plate 6, and a feed directional control valve is installed inside the feed valve plate 6, which is used to connect and control the feed cylinder;

[0008] The special feature is that a switching valve plate 3 is provided between the rotary valve plate 2 and the control valve plate 4. The switching valve plate 3 is a two-position two-way hydraulically controlled directional control valve, and its P port and P' port are respectively communicated with the main inlet port P1 and the secondary inlet port P2, and its control port X is communicated with the P' port of the rotary directional control valve, which is used to separate and control the oil inlet directions of the main inlet port P1 and the secondary inlet port P2;

[0009] A first shuttle valve is provided inside the rotary valve plate 2, and a second shuttle valve is provided inside the feed valve plate 6. One end of the first shuttle valve is communicated with the P' port of the rotary directional control valve, the other end of the first shuttle valve is communicated with the output end of the second shuttle valve, and the output end of the first shuttle valve is communicated with the feedback port LS provided on the inlet valve plate; which is used to feedback the oil pressure to the main pump of the tunnel drilling rig;

[0010] The rotary directional control valve, the working condition switching valve of the control valve plate, and the feed directional control valve are all hydraulically controlled manual directional control valves. A pilot valve plate 7 is also provided on one side of the feed valve plate 6. A drain port Y and a pressure reducing overflow valve are provided on the pilot valve plate 7. The input end of the pressure reducing overflow valve is communicated with the secondary inlet port P2, the unloading end is communicated with the drain port Y, and the output end is respectively and correspondingly communicated with the control ports at both ends of the rotary directional control valve, the working condition switching valve, and the feed directional control valve through a pair of solenoid valves provided inside the rotary valve plate, the control valve plate, and the feed valve plate;

[0011] A three-way flow valve is provided inside the secondary inlet valve plate 5. The three-way flow valve is connected between the secondary inlet port P2 and the return port T. One end of the second shuttle valve is communicated with the P' port of the feed directional control valve, the other end is communicated with the output end of the pressure reducing overflow valve, and the output end is communicated with the control end of the three-way flow valve, which is used to realize the load feedback of the feed cylinder during work.

[0012] As a further preference, the rotary directional control valve is a three-position seven-way directional control valve. Its P port is communicated with the main inlet port P1 through a pressure compensation valve, its T port is communicated with the return port T, and its A port and B port are respectively and correspondingly communicated with the working port A1 and the working port B1 provided on the rotary valve plate 2.

[0013] As a further preference, when the rotary reversing valve is in the middle position, the P port is cut off, and the P', A, B, and T ports are interconnected. At this time, no pressure oil enters the P port, and the pressure oil at the P', A, and B ports is unloaded through the oil return port T, and the hydraulic motor floats and stops.

[0014] As a further preference, when the rotary reversing valve is in the upper position, its P, P', and B ports are interconnected, and the T and A ports are interconnected. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows into the hydraulic motor through the P port, B port, and working port B1 to drive the motor to rotate forward; at the same time, the pressure oil flows from the P port to the P' port to the control oil port X of the switching valve plate and the first shuttle valve to realize the commutation of the switching valve plate.

[0015] As a further preference, when the rotary reversing valve is in the lower position, its P, P', and A ports are interconnected, and the T and B ports are interconnected. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows in from the main oil inlet P1, passes through the rotary reversing valve to the working port B1, the control oil port X of the switching valve plate, and the first shuttle valve, and the pressure oil at the B port flows back to the fuel tank through the rotary reversing valve to realize the reverse rotation action of the motor and the commutation of the switching valve plate.

[0016] As a further preference, when the switching valve plate is in the lower position, its P and P' ports are interconnected to realize the oil supply of the main pump and the auxiliary pump to the multi-way reversing valve together; when the switching valve plate is in the upper position, its P and P' ports are respectively cut off to realize the oil supply of the main pump of the tunnel drilling rig to the rotary reversing valve and its subsequent reversing valves, and the auxiliary pump to the feed reversing valve and its subsequent reversing valves.

[0017] As a further preference, the control valve plate 4 includes a chuck clamping oil port A3, a gripper clamping oil port A4, a gripper releasing oil port B4, and an oil drain port Y1 provided on the valve plate, and a gripper reversing valve, a chuck reversing valve, and the working condition switching valve provided inside the valve plate.

[0018] As a further preference, the gripper reversing valve is a two-position four-way hydraulic control reversing valve, its P port is connected to the main oil inlet P1 and the auxiliary oil inlet P2 through the third shuttle valve, the T port is connected to the oil drain port Y1, the A port is connected to the gripper clamping oil port A4, and the B port is connected to the gripper releasing oil port B4; its hydraulic control oil port X is connected to the B port of the rotary reversing valve and the P1' port of the working condition switching valve through the fourth shuttle valve.

[0019] As a further preference, the chuck reversing valve is a two-position three-way hydraulic control reversing valve, its P port is connected to the P port of the gripper reversing valve, the T port is connected to the oil drain port Y1, the A port is connected to the chuck clamping oil port A3, and its hydraulic control oil port X is connected to the P2' port of the working condition switching valve.

[0020] As a further preference, the working condition switching valve is a three-position six-way hydraulically controlled manual reversing valve. Its P1 port is connected to the B port of the feed reversing valve through a control oil circuit. Its P2 port is connected to the A port of the feed reversing valve through a control oil circuit. Its P3 port is connected to the A port of the rotary reversing valve through a one-way valve. Its T port is connected to the oil return port T.

[0021] The beneficial effects of the present utility model are as follows:

[0022] 1. Since a switching valve plate is provided between the rotary valve plate and the control valve plate, the switching valve plate is a two-position two-way hydraulically controlled reversing valve, and its P port and P' port are respectively connected to the main oil inlet P1 and the auxiliary oil inlet P2, and its control end X port is connected to the P' port of the rotary reversing valve provided in the rotary valve plate 2. Therefore, the oil inlet directions of the main oil inlet P1 and the auxiliary oil inlet P2 can be separated and controlled; when working, the main pump supplies oil to the rotary reversing valve and its subsequent reversing valves, and the auxiliary pump supplies oil to the feed reversing valve and its subsequent reversing valves, which can improve the load-bearing capacity of the hydraulic motor;

[0023] 2. Since a first shuttle valve is provided in the rotary valve plate 2, a second shuttle valve is provided in the feed valve plate 6, one end of the first shuttle valve is connected to the P' port of the rotary reversing valve, the other end of the first shuttle valve is connected to the output end of the second shuttle valve, and the output end of the first shuttle valve is connected to the feedback port LS provided on the oil inlet valve plate; therefore, the oil pressure of the hydraulic motor can be fed back to the main pump of the tunnel drilling rig; since a three-way flow valve is provided in the auxiliary oil inlet valve plate 5 and is connected between the auxiliary oil inlet P2 and the oil return port T, one end of the second shuttle valve is connected to the P' port of the feed reversing valve provided in the feed valve plate, the other end is connected to the output end of the pressure reducing overflow valve, and the output end is connected to the control end of the three-way flow valve. During operation, the load feedback of the feed cylinder can be realized, so as to automatically adjust the pressure of the pressure oil supplied to the hydraulic motor and the feed cylinder according to the load situation, and accurately control the working parameters. This can not only avoid waste of pressure and thus improve energy efficiency, but also avoid insufficient pressure affecting the work and improve the system stability.

[0024] 3. Since the rotary reversing valve, the working condition switching valve of the control valve plate, and the feed reversing valve are all hydraulically controlled manual reversing valves, a pressure reducing overflow valve is provided on the pilot valve plate 7 and its input end is connected to the auxiliary oil inlet P2, and the output end is respectively connected to the control ports at both ends of the rotary reversing valve, the working condition switching valve, and the feed reversing valve through a pair of solenoid valves provided in the rotary valve plate, the control valve plate, and the feed valve plate; therefore, this multi-way reversing valve has two control methods: manual and electric control, which is convenient to operate, can be flexibly switched, has a small floor area, and can be used normally in various complex environments. Description of the Drawings

[0025] Figure 1 is a structural schematic diagram of the present utility model.

[0026] Figure 2 is Figure 1 the top view of

[0027] Figure 3 is Figure 1 the bottom view of

[0028] Figure 4 is Figure 1 the left view of

[0029] Figure 5 is Figure 1 the right view of

[0030] Figure 6 is the three - dimensional structure diagram of the present utility model.

[0031] Figure 7 is the hydraulic schematic diagram of the present utility model.

[0032] Figure 8 is Figure 7 the partial enlarged view of the rotary valve plate in

[0033] In the figure: inlet valve plate 1, rotary valve plate 2, switching valve plate 3, control valve plate 4, secondary inlet valve plate 5, feed valve plate 6, pilot valve plate 7, solenoid valve 8, pilot oil circuit 9, hydraulic motor 10, gripper 11, chuck 12, feed cylinder 13, feedback oil circuit 14, fifth shuttle valve 15, sixth shuttle valve 16, seventh shuttle valve 17, pilot operated check valve 18;

[0034] overflow valve 101, rotary direction - changing valve 201, pressure compensation valve 202, first shuttle valve 203, overflow valve 204, gripper direction - changing valve 401, chuck direction - changing valve 402, working condition switching valve 403, fourth shuttle valve 404, check valve 405, third shuttle valve 501, sequence valve 502, check valve 503, three - way flow valve 504, overflow valve 505, feed direction - changing valve 601, pressure compensation valve 602, second shuttle valve 603, overflow valve 604, overflow valve 605, pressure - reducing overflow valve 701. Specific embodiments

[0035] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0036] As Figures 1 to 8As shown in the figure, the present utility model relates to a load-sensitive dual-pump multi-way directional control valve for a tunnel drilling rig, which includes an inlet valve plate 1, a rotary valve plate 2, a switching valve plate 3, a control valve plate 4, a secondary inlet valve plate 5, a feed valve plate 6 and a pilot valve plate 7 that are sequentially connected by bolts. A main inlet port P1 and a return port T are provided on the inlet valve plate 1, which are respectively used to connect the main pump and the fuel tank of the tunnel drilling rig; a secondary inlet port P2 is provided on the secondary inlet valve plate 5, which is used to connect the secondary pump of the tunnel drilling rig; a working port A1 and a working port B1 are provided on the rotary valve plate 2, and a rotary directional control valve 201 and a pre-positioned pressure compensation valve 202 are arranged inside the rotary valve plate 2, which are used to connect and control a hydraulic motor 10; a working port A2 and a working port B2 are provided on the feed valve plate 6, and a feed directional control valve 601 and a pre-positioned pressure compensation valve 602 are arranged on the feed valve plate 6, which are used to connect and control a feed cylinder 13.

[0037] The rotary directional control valve 201 is a three-position seven-way hydraulically controlled manual directional control valve. Its P port is communicated with the main inlet port P1 through the pre-positioned pressure compensation valve 202, its T port is communicated with the return port T, and its A port and B port are respectively and correspondingly communicated with the working port A1 and the working port B1 through the working oil passages arranged inside the rotary valve plate 2.

[0038] When the rotary directional control valve 201 is in the middle position, its P port is cut off, and the P', A, B, and T ports are communicated with each other. At this time, no pressure oil enters the P port, and the pressure oil at the P', A, and B ports is unloaded through the return port T, and the hydraulic motor 10 floats and stops.

[0039] When the rotary directional control valve 201 is in the upper position, its P port is communicated with the P' and B ports, and the T and A ports are communicated with each other. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows into the hydraulic motor 10 through the P port, B port, and working port B1, which is used to drive the hydraulic motor 10 to rotate forward; at the same time, the pressure oil flows from the P port to the P' port and then to the control oil port X of the switching valve plate 3 and the first shuttle valve 203, so as to realize the commutation of the switching valve plate 3.

[0040] When the rotary directional control valve 201 is in the lower position, its P port is communicated with the P' and A ports, and the T and B ports are communicated with each other. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows in from the main inlet port P1, passes through the rotary directional control valve 201 and then flows to the working port A1, the control oil port X of the switching valve plate 3 and the first shuttle valve 203, and the pressure oil at the B port flows back to the fuel tank through the rotary directional control valve 201, which is used to realize the reverse rotation action of the hydraulic motor 10 and the commutation of the switching valve plate 3.

[0041] The switching valve plate 3 is a two-position two-way hydraulic control reversing valve. Its P port and P' port are respectively connected to the main oil inlet P1 and the secondary oil inlet P2 through working oil channels provided in the corresponding valve plates. Its control port X is connected to the P' port of the rotary reversing valve 201 through control oil channels provided in the rotary valve plate 2 and the switching valve plate 3, and is used to separate and control the oil inlet directions of the main oil inlet P1 and the secondary oil inlet P2.

[0042] When the switching valve plate 3 is in the lower position, its P and P' ports are connected. At this time, the main oil inlet P is connected to the secondary oil inlet P2, and the main pump and the secondary pump supply oil to this multi-way reversing valve together; when the switching valve plate 3 is in the upper position, the P and P' ports are cut off. At this time, the main oil inlet P is disconnected from the secondary oil inlet P2, so that the main pump of the tunnel drilling rig supplies oil to the rotary reversing valve 201 and its subsequent reversing valves, and the secondary pump supplies oil to the feed reversing valve 601 and its subsequent reversing valves.

[0043] The first shuttle valve 203 is also provided in the rotary valve plate 2, and the second shuttle valve 603 is provided in the feed valve plate 6. One end of the first shuttle valve 203 is connected to the P' port of the rotary reversing valve 201, and the other end is connected to the output end of the second shuttle valve 603 through a feedback oil channel 14 provided in the corresponding valve plate. The output end of the first shuttle valve 203 is connected to the feedback port LS provided on the inlet valve plate 1 through the feedback oil channel 14 provided in the corresponding valve plate; it is used to feedback the oil pressure to the main pump of the tunnel drilling rig.

[0044] The control valve plate 4 includes a chuck clamping oil port A3, a gripper clamping oil port A4, a gripper release oil port B4 and an oil drain port Y1 provided on the valve plate, and a gripper reversing valve 401, a chuck reversing valve 402, the working condition switching valve 403 and the fourth shuttle valve 404 provided in the valve plate, and is used to control the gripper 11 and the chuck 12.

[0045] The gripper reversing valve 401 is a two-position four-way hydraulic control reversing valve. Its P port is connected to the output end of the third shuttle valve 501 installed on the secondary inlet valve plate 5. The two input ends of the third shuttle valve 501 are respectively connected to the main oil inlet P1 and the secondary oil inlet P2. The T port is connected to the oil drain port Y1. The A port is connected to the gripper clamping oil port A4, and the B port is connected to the gripper release oil port B4; its hydraulic control port X is connected to the output end of the fourth shuttle valve 404 through a control oil channel in the control valve plate 4; the two input ends of the fourth shuttle valve 404 are respectively connected to the B port of the rotary reversing valve 201 and the P1' port of the working condition switching valve 403 through the corresponding valve plates.

[0046] The chuck reversing valve 402 is a two-position three-way hydraulically controlled reversing valve. Its P port is connected to the P port of the gripper reversing valve 401, its T port is connected to the oil drain port Y1, its A port is connected to the chuck clamping oil port A3, and its hydraulically controlled oil port X is connected to the P2' port of the working condition switching valve 403.

[0047] The working condition switching valve 403 is a three-position six-way hydraulically controlled manual reversing valve. Its P1 port is connected to the B port of the feed reversing valve 601 through a control oil passage provided in the corresponding valve plate. Its P2 port is connected to the A port of the feed reversing valve 601 through a control oil passage. Its P3 port is connected to the A port of the rotation reversing valve 201 through a one-way valve 405, and the direction of the one-way valve 405 is from the rotation reversing valve 201 to the P3 port for conduction. Its T port is connected to the oil return port T.

[0048] The feed reversing valves 601 are all three-position seven-way hydraulically controlled manual reversing valves, and their internal structures are the same as those of the rotation reversing valve 201. Their A ports and B ports are respectively connected to the working ports A2 and B2 through working oil passages provided in the feed valve plate 6 in a one-to-one correspondence. Their P ports are connected to the auxiliary oil inlet port P2 through a pre-set pressure compensation valve 602 and a working oil passage in the corresponding valve plate. Their T ports are connected to the oil return port T.

[0049] A sequence valve 502 and a one-way valve 503 are also provided on the auxiliary oil inlet valve plate 5. The auxiliary oil inlet port P2 is respectively connected to the P port of the feed reversing valve 601 and the P' port of the switching valve plate 3 through the sequence valve 502 and the one-way valve 503 in sequence, so as to limit that the auxiliary pump oil pressure entering the feed reversing valve 601 and the switching valve plate 3 from the auxiliary oil inlet port P2 is not lower than the set opening pressure of the sequence valve 502. The opening pressure of the sequence valve 502 is preferably 6 MPa.

[0050] An oil drain port Y and a pressure reducing overflow valve 701 are provided on the pilot valve plate 7. The input end of the pressure reducing overflow valve 701 is connected to the auxiliary oil inlet port P2 through the sequence valve 502 and the one-way valve 503. The unloading end is connected to the oil drain port Y. The output end is respectively connected to the control ports at both ends of the rotation reversing valve 201, the working condition switching valve 403, and the feed reversing valve 601 through a pair of electromagnetic valves 8 provided in the rotation valve plate 2, the control valve plate 4, and the feed valve plate 6.

[0051] The electromagnetic valve 8 is a two-position three-way valve. The P ports of each pair of electromagnetic valves 8 are connected to each other and are respectively connected to the output end of the pressure reducing overflow valve 701 through a pilot oil passage 9 in the corresponding valve plate. The T ports of each pair of electromagnetic valves 8 are connected to each other and are respectively connected to the oil drain port Y. The A ports of each pair of electromagnetic valves 8 are respectively connected to the control ports at both ends of the rotation reversing valve 201, the working condition switching valve 403, and the feed reversing valve 601 through a control oil passage in the corresponding valve plate.

[0052] A three-way flow valve 504 is installed on the secondary oil inlet valve plate 5. The three-way flow valve 504 is connected between the secondary oil inlet P2 and the oil return port T. One end of the second shuttle valve 603 is communicated with the P' port of the feed direction control valve 601, and the other end is communicated with the output end of the pressure reducing and overflow valve 701. The output end is communicated with the control end of the three-way flow valve 504 through a feedback oil circuit inside the corresponding valve plate, which is used to realize the load feedback of the feed cylinder during operation.

[0053] An overflow valve 101 is also provided on the oil inlet valve plate 1. The overflow valve 101 is connected between the main oil inlet P1 and the oil return port T; an overflow valve 505 is also provided on the secondary oil inlet valve plate 5. The overflow valve 505 is connected between the secondary oil inlet P2 and the oil return port T to prevent the system from overloading. An overflow valve 204 is also installed on the rotary valve plate 2. The overflow valve 204 is connected between the working port B1 and the oil return port T to protect the system and the hydraulic motor 10. Overflow valves 604 and 605 are also provided on the feed valve plate 6. The overflow valves 604 and 605 are respectively connected between the working ports A2, B2 and the oil return port T to protect the system and the feed cylinder.

[0054] During use, the working ports A2 and B2 are connected to the two ports of the feed cylinder through an externally connected floating circuit of the cylinder. The floating circuit of the cylinder includes a fifth shuttle valve 15, a sixth shuttle valve 16, a seventh shuttle valve 17 and two pilot-operated check valves 18. One end of the fifth shuttle valve 15, the X port, is communicated with the working port A1, and the other end, the drain port Y, is communicated with the fuel tank. The output end of the fifth shuttle valve 15 is communicated with one end of the sixth shuttle valve 16. The other end of the sixth shuttle valve 16 is communicated with the output end of the seventh shuttle valve 17. The output end of the sixth shuttle valve 16 is communicated with the control ends of the two pilot-operated check valves 18. The two ends of the seventh shuttle valve 17 are respectively communicated with the working ports A2, B2. The two pilot-operated check valves 18 are respectively connected between the working ports A2, B2 and the two ports of the feed cylinder.

[0055] When there is no pressure oil flowing into the working ports A2 and B2, if there is pressure oil on the side of the working port A1, the pressure oil flows through the fifth shuttle valve 15 and the sixth shuttle valve 16 to the control ends of the two pilot-operated check valves 18, causing the two pilot-operated check valves 18 to open. At this time, the cylinder is in a floating static state; if there is no pressure oil on the side of the working port A1, the two pilot-operated check valves 18 are in a closed state, and at this time, the feed cylinder is in a locked state. When there is pressure oil flowing into the working port A2 or B2, the pressure oil flows through the seventh shuttle valve 17 and the sixth shuttle valve 16 to the control ends of the two pilot-operated check valves 18 in sequence, causing the two pilot-operated check valves 18 to open, making the cylinder float. At this time, the cylinder makes a retracting or advancing movement.

[0056] During operation, the main pump pressure oil input from the main oil inlet P1 supplies oil to the rotary direction-changing valve 201. After the pressure oil of the auxiliary pump input from the auxiliary oil inlet P2 reaches 6 Mpa, it supplies oil to the feed direction-changing valve 601 and the working condition switching valve 403 through the sequence valve 502 and the one-way valve. Since the main pump supply pressure is greater than the auxiliary pump supply pressure, the main pump pressure oil supplies oil to the gripper direction-changing valve 401 and the chuck direction-changing valve 402 through the third shuttle valve 501. At the same time, the P' port of the rotary direction-changing valve 201 controls the switching valve plate 3, and the pressure oil at the B port of the rotary direction-changing valve 201 and the pressure oil at the P1' port of the working condition switching valve 403 control the gripper direction-changing valve 401 through the fourth shuttle valve 404, and the pressure oil at the P2' port of the working condition switching valve 403 controls the chuck direction-changing valve 402.

[0057] By controlling the working condition switching valve handle, the rotary direction-changing valve handle, and the feed direction-changing valve handle to be in the middle position, or by controlling the three pairs of solenoid valves 8, the rotary direction-changing valve 201, the working condition switching valve 403, and the feed direction-changing valve 601 are all in the middle position, and the tunnel drilling rig is in the shutdown state. At this time, the switching valve plate 3 is in the lower position, the gripper direction-changing valve 401 is in the upper position, and the chuck direction-changing valve 402 is in the upper position. When the pressure oil input from the auxiliary oil inlet P2 reaches 6 Mpa, it supplies oil to the feed direction-changing valve 601 through the sequence valve 502 and the one-way valve, and the pressure oil input from the main oil inlet P1 supplies oil to the rotary direction-changing valve 201. At this time, the hydraulic motor 10 is stationary, the gripper is clamped, the chuck is clamped, and the feed cylinder is locked.

[0058] Pull the working condition switching valve handle backward to enter the downhole drilling state, and pull the feed direction-changing valve handle backward to perform the drill pipe installation operation. At this time, the rotary direction-changing valve 201 is in the middle position, the working condition switching valve 403 is in the upper position, and the feed direction-changing valve 601 is in the upper position, so that the pressure oil sequentially passes through the P port and the A port of the feed direction-changing valve 601, the P2 port and the P2' port of the working condition switching valve 403, and the X port of the chuck direction-changing valve 402 to push the chuck direction-changing valve 402 to the lower position. At this time, the motor is stationary, the gripper is clamped, the chuck is loosened, and the feed cylinder retracts. When the feed cylinder retracts to the limit position, the drill pipe is inserted into the chuck to complete the installation operation of the first drill pipe.

[0059] Keep the control working condition switching valve handle in the pulled-back state, pull back the rotary direction-changing valve handle, and the forward feed direction-changing valve handle to perform the pre-downhole drilling operation. At this time, the rotary direction-changing valve 201 is in the upper position, the working condition switching valve 403 is in the upper position, and the feed direction-changing valve 601 is in the lower position. The main pump pressure oil sequentially passes through the P port and P' port of the rotary direction-changing valve 201, and the X port of the switching valve plate 3 to push the switching valve plate 3 to the upper position; at the same time, the auxiliary pump pressure oil sequentially passes through the P port and B port of the rotary direction-changing valve 201, and the fourth shuttle valve 404 reaches the X port of the gripper direction-changing valve 401 to push the gripper direction-changing valve 401 to the lower position. The main oil circuit is intercepted by the switching valve plate 3 into two parts. The left side of the switching valve plate 3 is the main pump pressure oil, and the right side of the switching valve plate 3 is the auxiliary pump pressure oil. At this time, the motor rotates forward, the gripper is released, the chuck is clamped, and the feed cylinder feeds, so that the chuck clamps the drill pipe, and the feed cylinder drives the chuck and the drill pipe to perform a horizontal feeding action to the limit position and then stops, completing the pre-downhole drilling operation.

[0060] Keep the control working condition switching valve handle in the pulled-back state, and return the rotary direction-changing valve handle and the feed direction-changing valve handle to the middle position. At this time, the working condition switching valve 403 is in the upper position, the rotary direction-changing valve 201 and the feed direction-changing valve 601 are in the middle position, the switching valve plate 3 is in the lower position, the gripper direction-changing valve 401 is in the upper position, and the chuck direction-changing valve 402 is in the upper position. At this time, the motor is stationary, the gripper is clamped, the chuck is clamped, and the feed cylinder is locked. Install the drill bit at the front end of the drill pipe to complete the drill bit installation operation.

[0061] Keep the control working condition switching valve handle in the pulled-back state, and pull back the feed direction-changing valve handle again to perform the drill pipe installation operation, so that the rotary direction-changing valve 201 is in the middle position, the working condition switching valve 403 is in the upper position, and the feed direction-changing valve 601 is in the upper position. At this time, the pressure oil sequentially passes through the P port and A port of the feed direction-changing valve 601, the P2 port, P2' port of the working condition switching valve 403, and the X port of the chuck direction-changing valve 402 to push the chuck direction-changing valve to the upper position, so that the motor is stationary, the gripper is clamped, the chuck is released, and the feed cylinder retracts. When the feed cylinder retracts to the limit position, the drill pipe is installed in the chuck to complete the installation operation of the second drill pipe.

[0062] Keep the control condition switching valve handle in the pulled-back state, pull back the rotary direction-changing valve handle, and operate the forward feed direction-changing valve handle to perform the downhole drilling operation. At this time, the rotary direction-changing valve 201 is in the upper position, the condition switching valve 403 is in the upper position, and the feed direction-changing valve 601 is in the lower position. The pressure oil sequentially passes through the P port, P' port of the rotary direction-changing valve 201, and the X port of the switching valve plate 3 to push the switching valve plate 3 to the upper position; at the same time, the pressure oil sequentially passes through the P port, B port of the rotary direction-changing valve 201, the fourth shuttle valve 404, and the X port of the gripper direction-changing valve 401 to push the gripper direction-changing valve 401 to the lower position, intercepting the main oil path into two parts by the switching valve plate 3. The left side of the switching valve plate 3 is the main pump pressure oil, and the right side of the switching valve plate 3 is the auxiliary pump pressure oil. At this time, the motor rotates forward, the gripper is released, the chuck is clamped, the feed cylinder feeds, the chuck clamps the drill pipe, and the feed cylinder drives the chuck and the drill pipe to perform horizontal feed for downhole drilling. After the action reaches the limit position, it stops, completing one downhole drilling operation.

[0063] Keep the control condition switching valve handle in the pulled-back state, pull back the feed direction-changing valve handle again to perform the drill pipe installation operation, so that the rotary direction-changing valve 201 is in the middle position, the condition switching valve 403 is in the upper position, and the feed direction-changing valve 601 is in the upper position. At this time, the pressure oil sequentially passes through the P port, A port of the feed direction-changing valve 601, the P2 port, P2' port of the condition switching valve 403, and the X port of the chuck direction-changing valve 402 to push the chuck direction-changing valve to the upper position; at this time, the motor is stationary, the gripper is clamped, the chuck is released, and the feed cylinder retracts. When the feed cylinder retracts to the limit position, the drill pipe is installed in the chuck, completing the installation operation of the third drill pipe. Repeat the downhole drilling operation and the drill pipe installation operation in this way until the work requirements are completed.

[0064] When the working elevation angle of the tunnel drilling rig is relatively large, the second and subsequent drill pipes cannot be installed in the conventional way. This multi-way direction-changing valve relies on the one-way valve and the condition switching valve 403 to install the second and subsequent drill pipes at a large elevation angle. Keep the control condition switching valve handle in the pulled-back state, keep the feed direction-changing valve handle in the middle position, and push forward the rotary direction-changing valve handle. At this time, the condition switching valve 403 is in the upper position, the rotary direction-changing valve 201 is in the lower position, and the feed direction-changing valve 601 is in the middle position. At this time, the pressure oil sequentially passes through the P port, A port of the rotary direction-changing valve 201, the one-way valve, the condition switching valve 403, and the fourth shuttle valve 404 to reach the X port of the gripper direction-changing valve 401, pushing the gripper direction-changing valve 401 to the lower position.

[0065] In order for the drill pipe lowering operation to proceed normally, when the working condition switching valve 403 is in the upper position, it is necessary to conduct between port P1 and port P1'. When the working condition switching valve 403 is supplied with oil at port P3, most of the pressure oil flows to port P1' for operation through the throttle hole provided in the valve stem of the working condition switching valve 403, and a small part flows to port P1 and then is unloaded through the oil drain port Y1 without affecting normal operation. At this time, the motor rotates in reverse, the gripper is released, the chuck is clamped, and the feed cylinder floats. Manually bring the head end of the drill pipe to be added close to the tail end of the added drill pipe, and drive the added drill pipe to rotate in reverse through the hydraulic motor 10 to drive the chuck, so that the connection between the drill pipe to be added and the added drill pipe can be realized.

[0066] After the drill pipe lowering and adding operations are completed, control the handle of the working condition switching valve to maintain the middle position and the handle of the rotation reversing valve to maintain the backward pulling state, so that the rotation reversing valve 201 is in the upper position and the working condition switching valve 403 is in the middle position; the motor keeps rotating forward, the gripper keeps released, and the chuck keeps clamped. At this time, push and pull the handle of the feed reversing valve back and forth to make the feed reversing valve 601 reciprocate between the feed and retraction positions, so that the drill bit and the drill pipe make a horizontal reciprocating motion in the rock formation to realize the reaming operation.

[0067] When pulling out the drill pipe, push the handle of the working condition switching valve forward to enter the drill pipe pulling out state, push the handle of the rotation reversing valve to the middle position, and pull the handle of the feed reversing valve backward to perform the drill pipe pulling out operation. At this time, the rotation reversing valve 201 is in the middle position, the working condition switching valve 403 is in the lower position, and the feed reversing valve 601 is in the upper position. The pressure oil sequentially passes through the feed reversing valve 601, the working condition switching valve 403, and the fourth shuttle valve 404 and enters port X of the gripper reversing valve 401, pushing the gripper reversing valve 401 to the lower position. At this time, the motor is stationary, the gripper is released, the chuck is clamped, and the feed cylinder retracts, so that the chuck clamps the drill pipe, and the feed cylinder drives the chuck and the drill pipe to perform a horizontal retraction action. After moving to a suitable distance where a drill pipe completely passes through the gripper, push the handle of the feed reversing valve forward to the middle position to lock the feed cylinder, and complete the first drill pipe pulling out operation.

[0068] Control the handle of the working condition switching valve to maintain the forward pushing state, the handle of the feed reversing valve to maintain the middle position, and push the handle of the rotation reversing valve forward to the forward pushing state. At this time, the rotation reversing valve 201 is in the lower position, the working condition switching valve 403 is in the lower position, and the feed reversing valve 601 is in the middle position. The pressure oil passes through the rotation reversing valve 201 and port X of the switching valve plate 3 to push the switching valve plate 3 to the upper position, intercepting the main oil path into two parts by the switching valve plate 3. At the same time, the pressure oil sequentially passes through the rotation reversing valve 201, working port A1, the fifth shuttle valve 15, and the sixth shuttle valve 16 and flows into the two pilot-operated check valves 18, keeping the two pilot-operated check valves 18 open and making the feed cylinder in a floating state. At this time, the hydraulic motor 10 drives the chuck to rotate in reverse, the gripper clamps, the chuck clamps, and the feed cylinder retracts driven by the chuck. When the threaded connection between the last drill pipe and the previous drill pipe is completely unscrewed, a drill pipe lowering operation is completed.

[0069] The control working condition switching valve handle is kept in the forward push state, the rotary reversing valve handle is pulled back to the middle position, and the feed reversing valve handle is pushed forward to the forward push state. At this time, the rotary reversing valve 201 is in the middle position, the working condition switching valve 403 is in the lower position, and the feed reversing valve 601 is in the lower position. The auxiliary pump pressure oil pushes the chuck reversing valve 402 to the upper position through the X port of the feed reversing valve 601, the working condition switching valve 403, and the chuck reversing valve 402 in turn. At this time, the motor is stationary, the clamp is clamped, the chuck is released, and the feed cylinder feeds. Remove the drill rod that has completed the rod lowering operation, and wait for the feed cylinder to drive the chuck to move to the limit position and stop, completing a pre-drilling operation.

[0070] The control working condition switching valve handle is kept in the forward push state, the rotary reversing valve handle is pulled back to keep in the middle position, and the feed reversing valve handle is pulled back to perform the drilling operation. At this time, the rotary reversing valve 201 is in the middle position, the working condition switching valve 403 is in the lower position, and the feed reversing valve 601 is in the upper position. The pressure oil reaches the X port of the clamp reversing valve 401 through the feed reversing valve 601, the working condition switching valve 403, and the fourth shuttle valve 404 in turn to push the clamp reversing valve to the lower position, so that the hydraulic motor 10 is stationary, the clamp is loosened, the chuck is clamped, and the feed cylinder retreats, thereby realizing the chuck clamping the drill rod. The feed cylinder drives the chuck and the drill rod to perform a horizontal retreat action. After a drill rod completely passes through the clamp at a suitable distance, the feed reversing valve handle is pushed forward to the middle position to lock the feed cylinder, and the secondary drilling operation is completed. In this way, the pre-drilling operation, the drilling operation and the rod lowering operation are repeated until the work requirements are completed.

[0071] In the shutdown state, the pressure oil outputted by the pressure relief valve 701 at 3.5Mpa flows to the hydraulic control oil port of the three-way flow valve 504 through the second shuttle valve 603, thereby controlling the pressure inputted by the auxiliary pump to the sequence valve 502 to be less than 6.5Mpa; at the same time, the pressure oil outputted by the pressure relief valve 701 flows to the feedback port LS through the second shuttle valve 603 and the first shuttle valve 203, giving a load signal of 3.5Mpa. Therefore, when working, the hydraulic motor 10 and the main pump realize load feedback through the feedback port LS, while the feed oil cylinder and the auxiliary pump realize load feedback through the three-way flow valve 504.

[0072] Although the implementation scheme of the utility model has been disclosed as above, it is not limited to the applications listed in the specification and implementation modes. It can be fully applied to various fields suitable for the utility model. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A load-sensitive dual-pump multi-way directional control valve for a tunnel drilling rig, comprising an inlet valve plate, a rotary valve plate, a control valve plate, a secondary inlet valve plate, and a feed valve plate connected in sequence. A main inlet port P1 and a return port T are provided on the inlet valve plate, which are respectively used to connect the main pump and the fuel tank of the tunnel drilling rig; a secondary inlet port P2 is provided on the secondary inlet valve plate, which is used to connect the secondary pump of the tunnel drilling rig; a working port A1 and a working port B1 are provided on the rotary valve plate, and a rotary directional control valve and a pressure compensation valve are installed inside the rotary valve plate, which are used to connect and control a hydraulic motor; a working port A2 and a working port B2 are provided on the feed valve plate, and a feed directional control valve is installed inside the feed valve plate, which is used to connect and control a feed cylinder; It is characterized in that: in A switching valve plate is provided between the rotary valve plate and the control valve plate. The switching valve plate is a two-position two-way hydraulically controlled directional control valve, and its P port and P' port are respectively communicated with the main inlet port P1 and the secondary inlet port P2, and its control port X is communicated with the P' port of the rotary directional control valve, which is used to separate and control the oil inlet directions of the main inlet port P1 and the secondary inlet port P2; A first shuttle valve is provided inside the rotary valve plate, and a second shuttle valve is provided inside the feed valve plate. One end of the first shuttle valve is communicated with the P' port of the rotary directional control valve, the other end of the first shuttle valve is communicated with the output end of the second shuttle valve, and the output end of the first shuttle valve is communicated with a feedback port LS provided on the inlet valve plate; which is used to feedback the oil pressure to the main pump of the tunnel drilling rig; The rotary directional control valve, the working condition switching valve of the control valve plate, and the feed directional control valve are all hydraulically controlled manual directional control valves. A pilot valve plate is also provided on one side of the feed valve plate. A drain port Y and a pressure reducing overflow valve are provided on the pilot valve plate. The input end of the pressure reducing overflow valve is communicated with the secondary inlet port P2, the unloading end is communicated with the drain port Y, and the output end is respectively communicated with the control ports at both ends of the rotary directional control valve, the working condition switching valve, and the feed directional control valve through a pair of solenoid valves provided inside the rotary valve plate, the control valve plate, and the feed valve plate; A three-way flow valve is provided inside the secondary inlet valve plate. The three-way flow valve is connected between the secondary inlet port P2 and the return port T. One end of the second shuttle valve is communicated with the P' port of the feed directional control valve, the other end is communicated with the output end of the pressure reducing overflow valve, and the output end is communicated with the control end of the three-way flow valve, which is used to realize the load feedback of the feed cylinder during operation.

2. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 1, characterized in that: The rotary directional control valve is a three-position seven-way directional control valve. Its P port is communicated with the main inlet port P1 through a pressure compensation valve, its T port is communicated with the return port T, and its A port and B port are respectively communicated with the working port A1 and the working port B1 provided on the rotary valve plate correspondingly.

3. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 2, characterized in that: When the rotary directional control valve is in the middle position, the P port is blocked, and the P', A, B, and T ports are communicated with each other. At this time, no pressure oil enters the P port, and the pressure oil at the P', A, and B ports is unloaded through the return port T, and the hydraulic motor floats and stops.

4. The load-sensitive double-pump multi-way directional control valve for a tunnel drilling rig according to claim 3, characterized in that: When the rotary directional control valve is in the upper position, its P, P', and B ports are connected, and the T and A ports are connected. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows into the hydraulic motor through the P port, the B port, and the working port B1, which is used to drive the motor to rotate forward; at the same time, the pressure oil flows from the P port and the P' port to the control oil port X of the switching valve plate and the first shuttle valve, realizing the commutation of the switching valve plate.

5. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 4, characterized in that: When the rotary direction-changing valve is in the lower position, its ports P, P', and A are connected, and ports T and B are connected. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows in from the main oil inlet P1, passes through this rotary direction-changing valve, and flows to the working port B1, the control oil port X of the switching valve plate, and the first shuttle valve. The pressure oil at port B returns to the fuel tank through this rotary direction-changing valve, which is used to realize the reverse operation of the motor and the commutation of the switching valve plate.

6. The load-sensitive double-pump multi-way directional control valve for a tunnel drilling rig according to any one of claims 1-5, characterized in that: When the switching valve plate is in the lower position, its ports P and P' are connected, which is used to realize the oil supply to this multi-way direction-changing valve by the main pump and the auxiliary pump together; when the switching valve plate is in the upper position, its ports P and P' are respectively blocked, which is used to realize the oil supply from the main pump of the tunnel drilling rig to the rotary direction-changing valve and its subsequent direction-changing valves, and the oil supply from the auxiliary pump to the feed direction-changing valve and its subsequent direction-changing valves.

7. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 1, characterized in that: The control valve plate includes a chuck clamping oil port A3, a gripper clamping oil port A4, a gripper release oil port B4, and an oil drain port Y1 provided on the valve plate, as well as a gripper reversing valve, a chuck reversing valve, and the working condition switching valve provided inside the valve plate.

8. The load-sensitive double-pump multi-way directional control valve for a tunnel drilling rig according to claim 7, characterized in that: The gripper reversing valve is a two-position four-way hydraulically controlled reversing valve. Its port P is connected to the main oil inlet P1 and the auxiliary oil inlet P2 through the third shuttle valve, its port T is connected to the oil drain port Y1, its port A is connected to the gripper clamping oil port A4, and its port B is connected to the gripper release oil port B4; its hydraulic control oil port X is connected to port B of the rotary direction-changing valve and port P1' of the working condition switching valve through the fourth shuttle valve.

9. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 7 or 8, characterized in that: The chuck reversing valve is a two-position three-way hydraulically controlled reversing valve. Its port P is connected to the port P of the gripper reversing valve, its port T is connected to the oil drain port Y1, its port A is connected to the chuck clamping oil port A3, and its hydraulic control oil port X is connected to port P2' of the working condition switching valve.

10. The load-sensitive double-pump multi-way directional control valve for a drift drill according to claim 9, characterized in that: The working condition switching valve is a three-position six-way hydraulically controlled manual reversing valve. Its port P1 is connected to port B of the feed direction-changing valve through a control oil circuit, its port P2 is connected to port A of the feed direction-changing valve through a control oil circuit, its port P3 is connected to port A of the rotary direction-changing valve through a one-way valve, and its port T is connected to the oil return port T.

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