Load-sensitive double pump multi-way reversing valve for drift drill

Abstract

A kind of gallery drilling machine load-sensitive double pump multi-way reversing valve, including oil inlet valve piece, rotary valve piece, control valve piece, auxiliary oil inlet valve piece, feed valve piece, oil inlet valve piece is equipped with main oil inlet, auxiliary oil inlet valve piece is equipped with auxiliary oil inlet, rotary valve piece is equipped with working port, rotary valve piece is equipped with rotary reversing valve and pressure compensation valve, feed valve piece is equipped with working port and feed reversing valve;Switching valve piece is equipped between rotary valve piece and control valve piece, its P, P' port is communicated with main, auxiliary oil inlet respectively, its control end X port is communicated with rotary reversing valve;Rotary valve piece is equipped with first shuttle valve, feed valve piece is equipped with second shuttle valve, one end of first shuttle valve is communicated with rotary reversing valve, other end is communicated with second shuttle valve, output end is communicated with feedback port LS.This reversing valve can automatically adjust the pressure of supply pressure oil according to load condition, realize accurate control to working parameter, not only can improve energy efficiency, but also improve system stability.

Description

Technical Field

[0001] This invention relates to a multi-way directional valve, and more particularly to a load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs. Background Technology

[0002] A tunnel drilling rig is a drilling machine used for drilling in underground tunnels, mainly for deep geological exploration, gas drainage, water injection and drainage, ventilation, and other engineering construction within tunnels. Its main structure consists of a power head equipped with a hydraulic chuck connected to a feed cylinder. The clamping device consists of two semi-circular slips; one slip is fixed, while the other is movable. Under the action of a disc spring, the two slips are pressed together. Its working principle is as follows: When the multi-way directional valve handle is switched, the power head rotates, causing the hydraulic chuck to clamp the drill rod and rotate. Simultaneously, the two slips of the clamping device open, releasing the drill rod. Pushing the handle forward to switch directions allows the power head to advance under the action of the feed cylinder, thus drilling. After drilling a drill rod, pushing the handle back to the neutral position stops the power head from advancing. Rotating the handle back to the neutral position stops the power head from rotating, and the two slips of the clamping device clamp the drill rod to prevent it from falling out. Add another drill rod to the tail of the drill rod, pull the push handle back to reverse the direction, the hydraulic chuck releases, and the power head retracts to the tail. Drilling is carried out in cycles by continuously adding drill rods. The clamping and opening of the chuck and the clamping and opening of the gripper are all controlled by the control valve group.

[0003] Currently, existing tunnel drilling rig directional valves generally use dual-pump oil supply, which solves the problem of unstable control of hydraulic chuck and clamp when using single-pump oil supply. However, this type of tunnel drilling rig directional valve has no load-sensitive system, and often there are situations where excessive oil supply occurs when the load is small, resulting in energy waste, or insufficient oil supply occurs when the load is large, affecting the working condition.

[0004] In addition, existing tunnel drilling rigs can connect to external hydraulic pilot handles to switch between manual and hydraulic control directional valves, but this switching method occupies a large area and is difficult to meet the requirements of use in more complex environments. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a load-sensitive dual-pump multi-way reversing valve for tunnel drilling rigs, which can automatically adjust the pressure of the hydraulic oil supplied to the hydraulic motor and feed cylinder according to the load conditions, so as to achieve accurate control of working parameters. This not only avoids pressure waste and thus improves energy efficiency, but also avoids insufficient pressure from affecting the work and improves system stability.

[0006] The technical solution of the present invention is as follows:

[0007] A load-sensitive dual-pump multi-way directional valve for a tunnel drilling rig includes 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. The inlet valve plate 1 has a main inlet port P1 and a return port T, used to connect to the main pump and oil tank of the tunnel drilling rig, respectively. The secondary inlet valve plate 5 has a secondary inlet port P2, used to connect to the secondary pump of the tunnel drilling rig. The rotary valve plate 2 has working ports A1 and B1, and a rotary directional valve and a pressure compensation valve are installed inside the rotary valve plate 2 for connecting to and controlling the hydraulic motor. The feed valve plate 6 has working ports A2 and B2, and a feed directional valve is installed inside the feed valve plate 6 for connecting to and controlling the feed cylinder.

[0008] Its special feature is that a switching valve 3 is provided between the rotary valve plate 2 and the control valve plate 4. The switching valve 3 is a two-position two-way hydraulic directional valve. Its P port and P' port are respectively connected to the main oil inlet P1 and the auxiliary oil inlet P2. Its control terminal X port is connected to the P' port of the rotary directional valve, which is used to separate and control the oil inlet direction of the main oil inlet P1 and the auxiliary oil inlet P2.

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

[0010] The rotary directional valve, the operating condition switching valve of the control valve plate, and the feed directional valve are all hydraulically controlled manual directional valves. A pilot valve plate 7 is also provided on one side of the feed valve plate 6. The pilot valve plate 7 is provided with an oil drain port Y and a pressure reducing relief valve. The input end of the pressure reducing relief valve is connected to the auxiliary oil inlet P2, the unloading end is connected to the oil drain port Y, and the output end is connected to the control ports at both ends of the rotary directional valve, the operating condition switching valve, and the feed directional valve respectively through a pair of solenoid valves provided in the rotary valve plate, the control valve plate, and the feed valve plate.

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

[0012] The rotary directional valve is a three-position seven-way directional valve. Its P port is connected to the main oil inlet P1 through a pressure compensation valve, its T port is connected to the oil return port T, and its A port and B port are respectively connected to the working port A1 and working port B1 provided on the rotary valve plate 2.

[0013] The control valve plate includes a chuck clamping port A3, a clamp clamping port A4, a clamp releasing port B4, and a drain port Y1 provided on the valve plate, as well as a clamp reversing valve, a chuck reversing valve, and the operating condition switching valve provided in the valve plate.

[0014] As a further preferred embodiment, when the rotary directional valve is in the neutral position, port P is closed, and ports P', A, B, and T are interconnected. At this time, no pressure oil is supplied to port P, and the pressure oil from ports P', A, and B is unloaded through the return port T, causing the hydraulic motor to float and remain stationary.

[0015] As a further preferred embodiment, when the rotary reversing valve is in the upper position, its P, P', and B ports are connected, and its 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, B port, and working port B1 to drive the motor to rotate forward. At the same time, the pressure oil flows through the P port and P' port to the control oil port X of the switching valve plate and the first shuttle valve to realize the reversal of the switching valve plate.

[0016] As a further preferred embodiment, when the rotary reversing valve is in the lower position, its P, P', and A ports are connected, and its T and B ports are connected. At this time, the pressure oil provided by the main pump of the tunnel drilling rig flows in from the main inlet P1, passes through the rotary reversing 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 flows back to the oil tank through the rotary reversing valve to realize the reverse action of the motor and the reversing of the switching valve plate.

[0017] As a further preferred embodiment, when the switching valve plate is in the lower position, its P and P' ports are connected, which is used to enable the main pump and the auxiliary pump to supply oil to the multi-way directional valve together; when the switching valve plate is in the upper position, its P and P' ports are respectively closed, which is used to enable the main pump of the tunnel drilling rig to supply oil to the rotary directional valve and its subsequent directional valves, and the auxiliary pump to supply oil to the feed directional valve and its subsequent directional valves.

[0018] As a further preferred embodiment, the clamp reversing valve is a two-position four-way hydraulic reversing valve. Its P port is connected to the main oil inlet P1 and the auxiliary oil inlet P2 through the third shuttle valve, its T port is connected to the drain port Y1, its A port is connected to the clamping oil port A4, and its B port is connected to the clamping 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 operating condition switching valve through the fourth shuttle valve.

[0019] As a further preferred embodiment, the chuck reversing valve is a two-position three-way hydraulically controlled reversing valve, with its P port connected to the P port of the clamping device reversing valve, its T port connected to the drain port Y1, its A port connected to the chuck clamping port A3, and its hydraulically controlled oil port X connected to the P2' port of the operating condition switching valve.

[0020] As a further preferred embodiment, the operating condition switching valve is a three-position six-way hydraulic manual directional valve, with its P1 port connected to the B port of the feed directional valve through a control oil circuit, its P2 port connected to the A port of the feed directional valve through a control oil circuit, its P3 port connected to the A port of the rotary directional valve through a check valve, and its T port connected to the return oil port T.

[0021] The beneficial effects of this invention are:

[0022] 1. Because a switching valve is provided between the rotary valve plate and the control valve plate, and this switching valve is a two-position two-way hydraulic directional valve with its P port and P' port connected to the main oil inlet P1 and the auxiliary oil inlet P2 respectively, and its control terminal X port connected to the P' port of the rotary directional valve located in the rotary valve plate 2, it can separate and control the oil inlet direction of the main oil inlet P1 and the auxiliary oil inlet P2; so that during operation, the main pump supplies oil to the rotary directional valve and its subsequent directional valves, and the auxiliary pump supplies oil to the feed directional valve and its subsequent directional valves, which can improve the load-bearing capacity of the hydraulic motor;

[0023] 2. Because a first shuttle valve is provided in the rotary valve plate 2 and 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 directional valve, and the other end of the first shuttle valve is connected to the output end of the second shuttle valve. The output end of the first shuttle valve is connected to the feedback port LS provided on the inlet valve plate; therefore, the oil pressure of the hydraulic motor can be fed back to the main pump of the tunnel drilling rig. Because a three-way flow valve is provided in the auxiliary inlet valve plate 5 and connected between the auxiliary inlet port P2 and the return port T, one end of the second shuttle valve is connected to the P' port of the feed directional valve provided in the feed valve plate, and the other end is connected to the output end of the pressure reducing overflow valve. The output end is connected to the control end of the three-way flow valve. During operation, load feedback of the feed cylinder can be realized, thereby realizing automatic adjustment of the pressure of the hydraulic motor and the input pressure oil supplied to the feed cylinder according to the load, realizing accurate control of working parameters, which not only avoids pressure waste and thus improves energy efficiency, but also avoids insufficient pressure affecting the work and improves system stability.

[0024] 3. Since the rotary directional valve, the operating condition switching valve of the control valve plate, and the feed directional valve are all hydraulically controlled manual directional valves, a pressure reducing relief valve is provided on the pilot valve plate 7 and its input end is connected to the auxiliary oil inlet P2. The output end is connected to the control ports at both ends of the rotary directional valve, the operating condition switching valve, and the feed directional valve respectively 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 directional valve has both manual and electric control modes, which are convenient to operate and can be flexibly switched. It has a small footprint and can be used normally in various complex environments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the present invention.

[0026] Figure 2 yes Figure 1 Top view.

[0027] Figure 3 yes Figure 1 A bottom view.

[0028] Figure 4 yes Figure 1 The left view.

[0029] Figure 5 yes Figure 1 The right view.

[0030] Figure 6 This is a three-dimensional structural diagram of the present invention.

[0031] Figure 7 This is a hydraulic schematic diagram of the present invention.

[0032] Figure 8 yes Figure 7 A magnified view of a portion of the rotating valve plate.

[0033] In the diagram: 1. Inlet valve plate; 2. Rotary valve plate; 3. Switching valve plate; 4. Control valve plate; 5. Auxiliary inlet valve plate; 6. Feed valve plate; 7. Pilot valve plate; 8. Solenoid valve; 9. Pilot oil circuit; 10. Hydraulic motor; 11. Clamp; 12. Chuck; 13. Feed cylinder; 14. Feedback oil circuit; 15. Fifth shuttle valve; 16. Sixth shuttle valve; 17. Seventh shuttle valve; 18. Hydraulic control check valve.

[0034] Overflow valve 101, rotary directional valve 201, pressure compensation valve 202, first shuttle valve 203, overflow valve 204, gripper directional valve 401, chuck directional valve 402, operating 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 directional valve 601, pressure compensation valve 602, second shuttle valve 603, overflow valve 604, overflow valve 605, pressure reducing overflow valve 701. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1 to 8As shown, the present invention relates to a load-sensitive dual-pump multi-way directional valve for a tunnel drilling rig, comprising an inlet valve plate 1, a rotary valve plate 2, a switching valve plate 3, a control valve plate 4, an auxiliary inlet valve plate 5, a feed valve plate 6, and a pilot valve plate 7 connected in sequence by bolts. The inlet valve plate 1 has a main inlet port P1 and a return port T, which are respectively used to connect the main pump and the oil tank of the tunnel drilling rig. The auxiliary inlet valve plate 5 has an auxiliary inlet port P2, which is used to connect the auxiliary pump of the tunnel drilling rig. The rotary valve plate 2 has a working port A1 and a working port B1, and a rotary directional valve 201 and a pre-positioned pressure compensation valve 202 are provided inside the rotary valve plate 2 for connecting and controlling the hydraulic motor 10. The feed valve plate 6 has a working port A2 and a working port B2, and a feed directional valve 601 and a pre-positioned pressure compensation valve 602 are provided on the feed valve plate 6 for connecting and controlling the feed cylinder 13.

[0037] The rotary directional valve 201 is a three-position seven-way hydraulic manual directional valve. Its P port is connected to the main oil inlet P1 through the pre-positioned pressure compensation valve 202, its T port is connected to the return oil port T, and its A port and B port are respectively connected to the working port A1 and the working port B1 through the working oil passage provided in the rotary valve plate 2.

[0038] When the rotary directional valve 201 is in the neutral position, its P port is closed, and P', A, B, and T ports are interconnected. At this time, no pressure oil is supplied to the P port, and the pressure oil in the P', A, and B ports is unloaded through the return port T, and the hydraulic motor 10 floats and remains stationary.

[0039] When the rotary reversing valve 201 is in the upper position, its P port is connected to P' and B ports, and its 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 10 through the P port, B port, and working port B1 to drive the hydraulic motor 10 to rotate forward. At the same time, the pressure oil flows through the P port and P' port to the control oil port X of the switching valve plate 3 and the first shuttle valve 203 to realize the reversal of the switching valve plate 3.

[0040] When the rotary directional valve 201 is in the lower position, its P port is connected to P' and A ports, and its T and B ports 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, and flows through the rotary directional valve 201 to the working port A1, the control oil port X of the switching valve plate 3, and the first shuttle valve 203. The pressure oil at port B flows back to the oil tank through the rotary directional valve 201 to realize the reverse action of the hydraulic motor 10 and the switching valve plate 3.

[0041] The switching valve plate 3 is a two-position two-way hydraulic directional valve. Its P port and P' port are respectively connected to the main oil inlet P1 and the auxiliary oil inlet P2 through working oil passages provided in the corresponding valve plates. Its control terminal X port is connected to the P' port of the rotary directional valve 201 through control oil passages provided in the rotary valve plate 2 and the switching valve plate 3, which is used to separate and control the oil inlet direction of the main oil inlet P1 and the auxiliary 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 and the auxiliary oil inlet P2 are connected, and the main pump and the auxiliary pump supply oil to the multi-way directional valve together. When the switching valve plate 3 is in the upper position, its P and P' ports are closed. At this time, the main oil inlet P and the auxiliary oil inlet P2 are disconnected, so that the main pump of the tunnel drilling rig supplies oil to the rotary directional valve 201 and its subsequent directional valves, and the auxiliary pump supplies oil to the feed directional valve 601 and its subsequent directional valves.

[0043] The rotary valve plate 2 is also provided with the first shuttle valve 203, and the feed valve plate 6 is provided with the second shuttle valve 603. 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 the feedback oil passage 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 oil inlet valve plate 1 through the feedback oil passage 14 provided in the corresponding valve plate; used to provide feedback oil pressure to the main pump of the tunnel drilling rig.

[0044] The control valve plate 4 includes a chuck clamping port A3, a clamp clamping port A4, a clamp releasing port B4, and a drain port Y1 provided on the valve plate, as well as a clamp reversing valve 401, a chuck reversing valve 402, a working condition switching valve 403, and a fourth shuttle valve 404 provided in the valve plate, for controlling the clamp 11 and the chuck 12.

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

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

[0047] The operating condition switching valve 403 is a three-position six-way hydraulic manual directional valve. Its P1 port is connected to the B port of the feed directional valve 601 through a control oil circuit located in the corresponding valve plate. Its P2 port is connected to the A port of the feed directional valve 601 through a control oil circuit. Its P3 port is connected to the A port of the rotary directional valve 201 through a check valve 405, and the direction of the check valve 405 is from the rotary directional valve 201 to the P3 port. Its T port is connected to the return oil port T.

[0048] The feed directional valves 601 are all three-position seven-way hydraulic manual directional valves, and their internal structure is the same as that of the rotary directional valve 201. Their A port and B port are respectively connected to the working port A2 and the working port B2 through the working oil passages provided in the feed valve plate 6. Their P port is connected to the auxiliary oil inlet P2 through the front pressure compensation valve 602 and the working oil passage in the corresponding valve plate. Their T port is connected to the return oil port T.

[0049] The auxiliary inlet valve plate 5 is also equipped with a sequence valve 502 and a check valve 503. The auxiliary inlet port P2 is connected to the P port of the feed directional valve 601 and the P' port of the switching valve plate 3 through the sequence valve 502 and the check valve 503 respectively, to limit the auxiliary pump oil pressure entering the feed directional valve 601 and the switching valve plate 3 from the auxiliary inlet port P2 to be no lower than the set opening pressure of the sequence valve 502. The opening pressure of the sequence valve 502 is preferably 6 MPa.

[0050] The pilot valve plate 7 is provided with an oil drain port Y and a pressure reducing overflow valve 701. The input end of the pressure reducing overflow valve 701 is connected to the auxiliary oil inlet P2 through the sequence valve 502 and the check valve 503, and the unloading end is connected to the oil drain port Y. The output end is connected to the control ports at both ends of the rotary directional valve 201, the working condition switching valve 403 and the feed directional valve 601 through a pair of solenoid valves 8 provided in the rotary valve plate 2, the control valve plate 4 and the feed directional valve plate 6 respectively.

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

[0052] A three-way flow valve 504 is installed on the auxiliary oil inlet valve plate 5. The three-way flow valve 504 is connected between the auxiliary oil inlet port P2 and the return port T. One end of the second shuttle valve 603 is connected to the P' port of the feed reversing valve 601, and the other end is connected to the output end of the pressure reducing relief valve 701. The output end is connected to the control end of the three-way flow valve 504 through the feedback oil circuit in 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 inlet valve plate 1, which is connected between the main inlet port P1 and the return port T. An overflow valve 505 is also provided on the auxiliary inlet valve plate 5, which is connected between the auxiliary inlet port P2 and the return port T to prevent system overload. An overflow valve 204 is also provided on the rotary valve plate 2, which is connected between the working port B1 and the return port T to protect the system and the hydraulic motor 10. An overflow valve 604 and 605 are also provided on the feed valve plate 6, which are respectively connected between the working ports A2 and B2 and the return port T to protect the system and the feed cylinder.

[0054] In use, working ports A2 and B2 are connected to the two ports of the feed cylinder via an external hydraulic cylinder floating circuit. The hydraulic cylinder floating circuit includes a fifth shuttle valve 15, a sixth shuttle valve 16, a seventh shuttle valve 17, and two hydraulically controlled check valves 18. One end of the fifth shuttle valve 15 (X port) is connected to working port A1, and the other end (Y drain port) is connected to the oil tank. The output end of the fifth shuttle valve 15 is connected to one end of the sixth shuttle valve 16, and the other end of the sixth shuttle valve 16 is connected to the output end of the seventh shuttle valve 17. The output end of the sixth shuttle valve 16 is connected to the control ends of the two hydraulically controlled check valves 18. The two ends of the seventh shuttle valve 17 are connected to working ports A2 and B2, respectively. The two hydraulically controlled check valves 18 are connected between working ports A2 and B2 and the two ports of the feed cylinder, respectively.

[0055] When no pressurized oil is supplied to working ports A2 and B2, if pressurized oil is supplied to working port A1, the pressurized oil flows through the fifth shuttle valve 15 and the sixth shuttle valve 16 to the control ends of the two hydraulically controlled check valves 18, causing the two hydraulically controlled check valves 18 to open. At this time, the cylinder is in a floating, stationary state. If there is no pressurized oil supplied to working port A1, the two hydraulically controlled check valves 18 are closed, and the feed cylinder is in a locked state. When pressurized oil is supplied to working ports A2 or B2, the pressurized oil flows through the seventh shuttle valve 17 and the sixth shuttle valve 16 in sequence to the control ends of the two hydraulically controlled check valves 18, causing the two hydraulically controlled check valves 18 to open, causing the cylinder to float. At this time, the cylinder performs a retracting or advancing action.

[0056] During operation, the main pump pressure oil input at the main inlet P1 supplies oil to the rotary directional valve 201. After the auxiliary pump pressure oil input at the secondary inlet P2 reaches 6 MPa, it passes through the sequence valve 502 and the check valve to supply oil to the feed directional valve 601 and the operating condition switching valve 403. Because the main pump supply pressure is greater than the auxiliary pump supply pressure, the main pump pressure oil passes through the third shuttle valve 501 to supply oil to the clamp directional valve 401 and the chuck directional valve 402. Simultaneously, the P' port of the rotary directional valve 201 controls the switching valve plate 3. The pressure oil at the B port of the rotary directional valve 201 and the pressure oil at the P1' port of the operating condition switching valve 403 pass through the fourth shuttle valve 404 to control the clamp directional valve 401, and the pressure oil at the P2' port of the operating condition switching valve 403 controls the chuck directional valve 402.

[0057] By controlling the operating condition switching valve handle, rotary directional valve handle, and feed directional valve handle to the neutral position, or by controlling the three pairs of solenoid valves 8, the rotary directional valve 201, operating condition switching valve 403, and feed directional valve 601 are all in the neutral position, and the tunnel drilling rig is in a stopped state. At this time, the switching valve plate 3 is in the lower position, the clamp directional valve 401 is in the upper position, and the chuck directional valve 402 is in the upper position. When the pressure oil input at the auxiliary oil inlet P2 reaches 6 MPa, it supplies oil to the feed directional valve 601 through the sequence valve 502 and the check valve, and the pressure oil input at the main oil inlet P1 supplies oil to the rotary directional valve 201. At this time, the hydraulic motor 10 is stationary, the clamp is clamped, the chuck is clamped, and the feed cylinder is locked.

[0058] Pull back the working condition switching valve handle to enter the drilling state, then pull back the feed directional valve handle to perform the drill pipe installation operation. At this time, the rotary directional valve 201 is in the neutral position, the working condition switching valve 403 is in the upper position, and the feed directional valve 601 is in the upper position. This causes the pressurized oil to sequentially pass through the P and A ports of the feed directional valve 601, the P2 and P2' ports of the working condition switching valve 403, and the X port of the chuck directional valve 402, pushing the chuck directional valve 402 to the lower position. At this time, the motor stops, the clamp tightens, the chuck releases, and the feed cylinder retracts. When the feed cylinder retracts to its limit position, the drill pipe is inserted into the chuck, completing the installation of the first drill pipe.

[0059] The control condition switching valve handle is held in the pulled-back position, the rotary directional valve handle is pulled back, and the feed directional valve handle is pushed forward to perform a pre-drilling operation. At this time, the rotary directional valve 201 is in the upper position, the condition switching valve 403 is in the upper position, and the feed directional valve 601 is in the lower position. The main pump pressure oil passes through the P port and P' port of the rotary directional valve 201 in sequence, and the X port of the switching valve plate 3, pushing the switching valve plate 3 to the upper position. At the same time, the auxiliary pump pressure oil passes through the P port and B port of the rotary directional valve 201 in sequence, and the fourth shuttle valve 404 to the X port of the clamp directional valve 401, pushing the clamp directional 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 clamp is released, the chuck is clamped, and the feed cylinder feeds, causing the chuck to clamp the drill rod. The feed cylinder drives the chuck and drill rod to perform a horizontal feed action until the limit position is reached and then stops, completing the pre-drilling operation.

[0060] With the control condition switching valve handle held in the pulled-back position, return the rotary directional valve handle and feed directional valve handle to the neutral position. At this time, the condition switching valve 403 is in the upper position, the rotary directional valve 201 and feed directional valve 601 are in the neutral position, the switching valve plate 3 is in the lower position, the clamp directional valve 401 is in the upper position, and the chuck directional valve 402 is in the upper position. The motor is now stationary, the clamp is engaged, the chuck is engaged, and the feed cylinder is locked. The drill bit is then added to the front end of the drill pipe to complete the drill bit installation operation.

[0061] With the control condition switching valve handle held in the pulled-back position, pull back the feed directional valve handle to perform the drill rod installation operation again, so that the rotary directional valve 201 is in the neutral position, the control condition switching valve 403 is in the upper position, and the feed directional 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 directional valve 601, the P2 port and P2' port of the control condition switching valve 403, and the X port of the chuck directional valve 402, pushing the chuck directional valve to the upper position, stopping the motor, clamping the chuck, releasing the chuck, and retracting the feed cylinder. When the feed cylinder retracts to its limit position, the drill rod is installed into the chuck, completing the installation operation of the second drill rod.

[0062] The control condition switching valve handle is kept in the pulled-back position, the rotary directional valve handle is pulled back, and the feed directional valve handle is pushed forward to perform the drilling operation. At this time, the rotary directional valve 201 and the condition switching valve 403 are in the upper position, and the feed directional valve 601 is in the lower position. The pressure oil sequentially passes through the P port and P' port of the rotary directional 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 and B port of the rotary directional valve 201, the fourth shuttle valve 404, and the X port of the clamp directional valve 401 to push the clamp directional valve 401 to the lower position, and 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 clamp is released, the chuck clamps, the feed cylinder feeds, the chuck clamps the drill rod, and the feed cylinder drives the chuck and drill rod to feed horizontally to drill down. After the movement reaches the limit position, it stops, completing one drilling operation.

[0063] Keeping the control condition switching valve handle in the pulled-back position, pull back the feed directional valve handle to perform the drill rod addition operation again, so that the rotary directional valve 201 is in the neutral position, the control condition switching valve 403 is in the upper position, and the feed directional 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 directional valve 601, the P2 port and P2' port of the control condition switching valve 403, and the X port of the chuck directional valve 402, pushing the chuck directional valve to the upper position; at this time, the motor stops, the clamp tightens, the chuck loosens, and the feed cylinder retracts. When the feed cylinder retracts to the limit position, the drill rod is loaded into the chuck, completing the third drill rod addition operation. This cycle of drilling and drill rod addition operations is repeated until the work requirements are met.

[0064] When the working elevation angle of the tunnel drilling rig is large, the second and subsequent drill rods cannot be installed using conventional methods. This multi-way directional valve relies on a check valve and a working condition switching valve 403 to achieve the installation of the second and subsequent drill rods at large elevation angles. The working condition switching valve handle is kept in the pulled-back position, the feed directional valve handle is kept in the neutral position, and the rotary directional valve handle is pushed forward. At this time, the working condition switching valve 403 is in the upper position, the rotary directional valve 201 is in the lower position, and the feed directional valve 601 is in the neutral position. At this time, the pressurized oil sequentially passes through the P port and A port of the rotary directional valve 201, the check valve, the working condition switching valve 403, and the fourth shuttle valve 404 to reach the X port of the holder directional valve 401, pushing the holder directional valve 401 to the lower position.

[0065] For drilling operations to proceed normally, when the working condition switching valve 403 is in the upper position, it requires conduction between ports P1 and P1'. Through the throttling orifice located within the valve stem of the working condition switching valve 403, most of the pressurized oil flowing into port P1' when oil is supplied to port P3 allows for operation, while a small portion flowing into port P1 is unloaded through the drain port Y1 without affecting normal operation. At this time, the motor reverses, the clamp releases, the chuck clamps, and the feed cylinder floats. Manually bringing the head end of the drill rod to be added close to the tail end of the drill rod already added, the hydraulic motor 10 drives the chuck to reverse the drill rod, thus achieving connection between the drill rod to be added and the drill rod already added.

[0066] After the drilling and drill rod installation operations are completed, the control condition switching valve handle is kept in the neutral position and the rotary reversing valve handle is kept in the pulled-back position, so that the rotary reversing valve 201 is in the upper position and the condition switching valve 403 is in the neutral position; the motor keeps rotating forward, the clamp is kept loose, and the chuck is kept clamped. At this time, the feed reversing valve handle is pushed and pulled back to make the feed reversing valve 601 switch back and forth between feed and retraction, so that the drill bit and drill rod make horizontal reciprocating motion in the rock formation to realize the hole enlargement operation.

[0067] During tripping, the forward-push working condition switching valve handle enters the tripping state, the rotary reversing valve handle is pushed to the neutral position, and the backward-pull feed reversing valve handle performs the tripping operation. At this time, the rotary reversing valve 201 is in the neutral position, the working condition switching valve 403 is in the lower position, and the feed reversing valve 601 is in the upper position. Pressurized oil sequentially passes through the feed reversing valve 601, the working condition switching valve 403, and the fourth shuttle valve 404 into the X port of the chuck reversing valve 401, pushing the chuck reversing valve 401 to the lower position. At this time, the motor stops, the chuck is released, the chuck clamps, and the feed cylinder retracts, causing the chuck to clamp the drill pipe. The feed cylinder drives the chuck and drill pipe to perform a horizontal retraction action. After the drill pipe has completely passed the appropriate distance through the chuck, the forward-push feed reversing valve handle is pushed to the neutral position to lock the feed cylinder, completing the first tripping operation.

[0068] With the control condition switching valve handle in the forward position and the feed directional valve handle in the neutral position, push the rotary directional valve handle forward to the forward position. At this time, the rotary directional valve 201 is in the lower position, the control condition switching valve 403 is in the lower position, and the feed directional valve 601 is in the neutral position. The pressure oil flows through the rotary directional valve 201 and the X port of the switching valve plate 3 to push the switching valve plate 3 to the upper position, so that the main oil circuit is intercepted by the switching valve plate 3 into two parts. At the same time, the pressure oil flows sequentially through the rotary directional valve 201, working port A1, fifth shuttle valve 15, and sixth shuttle valve 16 into the two hydraulic control check valves 18, keeping the two hydraulic control check valves 18 in the open position, so that the feed cylinder is in a floating state. At this time, the hydraulic motor 10 drives the chuck to reverse, the clamp to tighten, and the chuck to tighten. The feed cylinder retracts under the drive of the chuck. When the threaded connection between the last drill rod and the previous drill rod is completely unscrewed, one rod lowering operation is completed.

[0069] With the control condition switching valve handle in the forward position, pull back the rotary directional valve handle to the neutral position, and push the feed directional valve handle forward to the forward position. At this time, the rotary directional valve 201 is in the neutral position, the condition switching valve 403 is in the lower position, and the feed directional valve 601 is in the lower position. The auxiliary pump pressure oil sequentially passes through the feed directional valve 601, the condition switching valve 403, and the X port of the chuck directional valve 402, pushing the chuck directional valve 402 to the upper position. At this time, the motor stops, the clamp is tightened, the chuck is released, and the feed cylinder advances. The drill rod that has completed the lowering operation is removed. After the feed cylinder drives the chuck to move to the limit position, it stops, completing one pre-tripping operation.

[0070] With the control condition switching valve handle in the forward position, the rotary directional valve handle pulled back to the neutral position, and the feed directional valve handle pulled back to initiate the drilling start operation. At this time, the rotary directional valve 201 is in the neutral position, the control condition switching valve 403 is in the lower position, and the feed directional valve 601 is in the upper position. Pressurized oil flows sequentially through the feed directional valve 601, the control condition switching valve 403, and the fourth shuttle valve 404 to the X port of the chuck directional valve 401, pushing the chuck directional valve to the lower position. This stops the hydraulic motor 10, releases the chuck, clamps the chuck, and retracts the feed cylinder, thus clamping the drill rod. The feed cylinder drives the chuck and drill rod to perform a horizontal retraction action. After a drill rod has completely passed the chuck a suitable distance, the feed directional valve handle is pushed forward to the neutral position to lock the feed cylinder, completing the second drilling start operation. This cycle of pre-drilling start, drilling start, and rod lowering operations is repeated until the work requirements are met.

[0071] In the shutdown state, 3.5 MPa pressure oil is output through the pressure reducing relief valve 701 and flows through the second shuttle valve 603 to the hydraulic control port of the three-way flow valve 504, thereby controlling the pressure input from the auxiliary pump to the sequence valve 502 to be less than 6.5 MPa. At the same time, the pressure oil output from the pressure reducing relief valve 701 flows through the second shuttle valve 603 and the first shuttle valve 203 to the feedback port LS, providing a 3.5 MPa load signal. Therefore, during operation, the hydraulic motor 10 and the main pump achieve load feedback through the feedback port LS, while the feed cylinder and the auxiliary pump achieve load feedback through the three-way flow valve 504.

[0072] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A load-sensitive dual-pump multi-way directional 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. The inlet valve plate has a main inlet port P1 and a return port T, which are respectively used to connect the main pump and the oil tank of the tunnel drilling rig; the secondary inlet valve plate has a secondary inlet port P2, which is used to connect the secondary pump of the tunnel drilling rig; the rotary valve plate has a working port A1 and a working port B1, and a rotary directional valve and a pressure compensation valve are installed inside the rotary valve plate for connecting and controlling the hydraulic motor; the feed valve plate has a working port A2 and a working port B2, and a feed directional valve is installed inside the feed valve plate for connecting and controlling the feed cylinder. The application is characterized in that in A switching valve is provided between the rotary valve plate and the control valve plate. The switching valve is a two-position two-way hydraulic directional valve. Its P port and P' port are respectively connected to the main oil inlet P1 and the auxiliary oil inlet P2. Its control terminal X port is connected to the P' port of the rotary directional valve. It is used to separate and control the oil inlet direction of the main oil inlet P1 and the auxiliary oil inlet P2. The rotary valve plate is equipped with a first shuttle valve, and the feed valve plate is equipped with a second shuttle valve. One end of the first shuttle valve is connected to the P' port of the rotary reversing valve, and the other end of the first shuttle valve is connected to the output end of the second shuttle valve. The output end of the first shuttle valve is connected to the feedback port LS provided on the oil inlet valve plate; used to provide feedback oil pressure to the main pump of the tunnel drilling rig. The rotary directional valve, the operating condition switching valve of the control valve plate, and the feed directional valve are all hydraulically controlled manual directional valves. A pilot valve plate is also provided on one side of the feed valve plate. The pilot valve plate is provided with an oil drain port Y and a pressure relief valve. The input end of the pressure relief valve is connected to the auxiliary oil inlet P2, the unloading end is connected to the oil drain port Y, and the output end is connected to the control ports at both ends of the rotary directional valve, the operating condition switching valve, and the feed directional valve respectively through a pair of solenoid valves provided in the rotary valve plate, the control valve plate, and the feed valve plate. A three-way flow valve is provided in the auxiliary oil inlet valve plate. The three-way flow valve is connected between the auxiliary oil inlet P2 and the return oil port T. One end of the second shuttle valve is connected to the P' port of the feed reversing valve, and the other end is connected to the output end of the pressure reducing overflow valve. The output end is connected to the control end of the three-way flow valve, which is used to realize the load feedback of the feed cylinder during operation. The rotary directional valve is a three-position seven-way directional valve. Its P port is connected to the main oil inlet P1 through a pressure compensation valve, its T port is connected to the oil return port T, and its A port and B port are respectively connected to the working port A1 and working port B1 provided on the rotary valve plate. The control valve plate includes a chuck clamping port A3, a clamp clamping port A4, a clamp releasing port B4, and a drain port Y1 provided on the valve plate, as well as a clamp reversing valve, a chuck reversing valve, and the operating condition switching valve provided in the valve plate.

2. The load sense dual pump multi-way directional valve for a raise-borer as set forth in claim 1, characterized by: When the rotary directional valve is in the neutral position, port P is closed, and ports P', A, B, and T are interconnected. At this time, no pressure oil flows into port P, and the pressure oil in ports P', A, and B is unloaded through the return port T, causing the hydraulic motor to float and remain stationary.

3. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to claim 2, characterized in that: When the rotary reversing valve is in the upper position, its P, P', and B ports are connected, and its 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, B port, and working port B1 to drive the motor to rotate forward. At the same time, the pressure oil flows through the P port and P' port to the control oil port X of the switching valve plate and the first shuttle valve to realize the reversal of the switching valve plate.

4. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to claim 3, characterized in that: When the rotary reversing valve is in the lower position, its P, P', and A ports are connected, and its T and B ports 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 the rotary reversing 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 flows back to the oil tank through the rotary reversing valve to realize the reverse action of the motor and the reversing of the switching valve plate.

5. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to any one of claims 1-4, characterized in that: When the switching valve plate is in the lower position, its P and P' ports are connected, which is used to enable the main pump and the auxiliary pump to supply oil to the multi-way directional valve together; when the switching valve plate is in the upper position, its P and P' ports are respectively closed, which is used to enable the main pump of the tunnel drilling rig to supply oil to the rotary directional valve and its subsequent directional valves, and the auxiliary pump to supply oil to the feed directional valve and its subsequent directional valves.

6. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to claim 1, characterized in that: The clamp reversing valve is a two-position four-way hydraulic reversing valve. Its P port is connected to the main oil inlet P1 and the auxiliary oil inlet P2 through the third shuttle valve, its T port is connected to the drain port Y1, its A port is connected to the clamping oil port A4, and its B port is connected to the clamping 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 operating condition switching valve through the fourth shuttle valve.

7. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to claim 1 or 6, characterized in that: The chuck reversing valve is a two-position three-way hydraulic reversing valve. Its P port is connected to the P port of the clamp reversing valve, its T port is connected to the drain port Y1, its A port is connected to the chuck clamping port A3, and its hydraulic control port X is connected to the P2' port of the operating condition switching valve.

8. The load-sensitive dual-pump multi-way directional valve for tunnel drilling rigs according to claim 7, characterized in that: The operating condition switching valve is a three-position six-way hydraulic manual directional valve. Its P1 port is connected to the B port of the feed directional valve through the control oil circuit, its P2 port is connected to the A port of the feed directional valve through the control oil circuit, its P3 port is connected to the A port of the rotary directional valve through a check valve, and its T port is connected to the return oil port T.

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