Main valve of directional drilling machine

Abstract

A main valve of a directional drilling machine comprises an oil inlet valve plate, a walking valve plate and a rotating valve plate, one side of the rotating valve plate is connected with a rapid propelling valve plate and an oil inlet propelling valve plate, the oil inlet propelling valve plate is provided with an oil inlet P1, a control port a0 and working ports A, B, A1 and B1, the rapid propelling valve plate is provided with working ports A2 and B2 and control ports a1 and b1, and the working ports A1 and B1 are correspondingly communicated with the working ports A2 and B2 respectively; the oil inlet propulsion valve plate forms a hydraulic control two-position four-way valve, ports P and T of the hydraulic control two-position four-way valve are correspondingly communicated with the working ports A and B respectively, the ports A and B are communicated with the working ports A1 and B1 respectively, and the control end is communicated with the control port a0; the rapid propulsion valve plate forms a hydraulic control three-position six-way valve and is provided with a pressure compensation valve, the three-position six-way valve is connected between the oil inlets P and P1 and the working ports A2 and B2 through the pressure compensation valve, and the control ends are correspondingly communicated with the control ports a1 and b1 respectively. According to the valve, the propelling speed of the feeding oil cylinder can be adjusted according to actual requirements, and the overall working efficiency is improved.

Description

Technical Field

[0001] The present invention relates to a hydraulic valve, and particularly to a main valve of a directional drilling rig. Background Art

[0002] A directional drilling rig is a pipeline construction tool in the engineering industry, generally used for oil, natural gas and some municipal pipeline construction. After processes such as positioning drilling, reaming, hole cleaning, and pipeline back-hauling with a large directional drilling rig, pipeline construction is carried out. During operation, the operator needs to remotely control the machine outside the directional drilling rig, so it is very important to ensure the stable and sensitive operation of the directional drilling rig.

[0003] When the directional drilling rig is working, it is necessary to adjust the working state of the valve group of the directional drilling rig according to the working conditions, and the valve group is required to respond quickly. The existing main valve of the directional drilling rig usually includes an oil inlet valve plate, a feed valve plate, a rotary valve plate and two travel valve plates connected in sequence. The oil fluid entering through the oil inlet valve plate enters the feed valve plate, the rotary valve plate and the two travel valve plates respectively, so as to control the work of the feed cylinder, the rotary motor and the two travel motors respectively. The existing main valve of the directional drilling rig has the following problems:

[0004] 1. The advancing speed of the controlled feed cylinder is fixed and non-adjustable, and cannot be adjusted according to actual needs, resulting in low system efficiency and insufficient flexibility.

[0005] 2. The flow rate required by the motor is relatively high. When using high-flow oil supply, the overall volume of the valve group will be too large, affecting the system layout and compactness. When using low-flow oil supply, it is difficult to meet the working requirements. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a main valve of a directional drilling rig, which can realize adjustable advancing speed of the feed cylinder and can be adjusted according to actual needs, so as to improve the overall working efficiency.

[0007] The technical solution of the present invention is as follows:

[0008] A main valve of a directional drilling rig includes an oil inlet valve plate, a travel valve plate and a rotary valve plate. An oil inlet port P and a return port T are provided on the oil inlet valve plate. The special feature is that a quick advance valve plate and an oil inlet advance valve plate are sequentially connected on one side of the rotary valve plate. An oil inlet port P1, a control port a0 and working ports A, B, A1, B1 are provided on the oil inlet advance valve plate. The oil inlet ports P and P1 are communicated with each other. Working ports A2, B2 and control ports a1, b1 are provided on the quick advance valve plate. The working ports A1, B1 are respectively corresponding and communicated with the working ports A2, B2 for externally connecting two feed cylinders;

[0009] The described oil inlet propulsion valve plate forms a hydraulically controlled two-position four-way valve through the internal valve stem. The P and T ports of the two-position four-way valve are respectively and correspondingly connected to the working ports A and B. The A and B ports are respectively connected to the working ports A1 and B1. The control end of the two-position four-way valve is connected to the control port a0, which is used to externally connect a pilot valve to control the state of the two-position four-way valve.

[0010] The fast propulsion valve plate forms a hydraulically controlled first three-position six-way valve through the valve stem provided inside it, and a pressure compensation valve is provided inside the fast propulsion valve plate. The first three-position six-way valve is connected between the oil inlet ports P, P1 and the working ports A2, B2 through the pressure compensation valve. The control ends at both ends of the first three-position six-way valve are respectively and correspondingly connected to the control ports a1 and b1, which are used to externally connect a pilot valve to control the state of the fast propulsion valve plate.

[0011] As a further preference, an oil supply port X is also provided on the oil inlet propulsion valve plate and a pressure reducing valve is installed. The oil inlet end of the pressure reducing valve is connected to the oil inlet port P1, and the output end is connected to the oil supply port X, which is used to externally connect a pilot valve.

[0012] As a further preference, the rotary valve plate includes a first rotary valve plate, a second rotary valve plate and a third rotary valve plate arranged in sequence. A pair of control ports a2, b2 and a3, b3 are respectively provided on the first and third rotary valve plates. A pair of working ports A3, B3 are provided on the second rotary valve plate. The first and third rotary valve plates respectively form a hydraulically controlled three-position seven-way valve through the internal valve stem; and pressure compensation valves are respectively provided inside the first and third rotary valve plates. The two three-position seven-way valves are respectively connected between the oil inlet ports P, P1 and the working ports A3, B3 through the corresponding pressure compensation valves. The control ends at both ends of the two three-position seven-way valves are respectively and correspondingly connected to the control ports a2, b2 and a3, b3, which are used to externally connect a pilot valve to control the state of the rotary valve plate.

[0013] As a further preference, when the two-position four-way valve is in the upper position, the working port A is connected to the working ports A1 and A2, and the working port B is connected to the working ports B1 and B2, which is used to control the feed cylinder to be in a slow propulsion state; when the two-position four-way valve is in the lower position, the working ports A and B are in a cut-off state with the working ports A1, A2, B1, B2, which is used to control the feed cylinder to be in a fast propulsion state.

[0014] As a further preference, when the first three-position six-way valve is in the middle position, the oil inlet ports P, P1 and the oil return port T are disconnected from the working ports A1, A2, B1, B2. At this time, the feed cylinder is stationary;

[0015] When the valve is in the lower position, the oil inlet ports P, P1 are connected to the working ports A1, A2, and the working ports B1, B2 are connected to the oil return port T. At this time, the feed cylinder is in a fast propulsion state;

[0016] When the valve is in the upper position, the oil inlet ports P and P1 are connected to the working ports B1 and B2, and the working ports A1 and A2 are connected to the oil return port T. At this time, the oil cylinder is in the fast retraction state.

[0017] As a further preference, when the three-position seven-way valve is in the middle position, its P port is cut off, and the oil return port T is connected to the working ports A3 and B3. At this time, the motor is stationary; when the valve is in the lower position, the oil inlet ports P and P1 are connected to the working port A3, and the working port B3 is connected to the oil return port T. At this time, the motor is in the forward rotation state; when the valve is in the upper position, the oil inlet ports P and P1 are connected to the working port B3, and the working port A3 is connected to the oil return port T. At this time, the motor is in the reverse rotation state.

[0018] As a further preference, there are two walking valve plates, which are the first walking valve plate and the second walking valve plate in sequence. The working ports A4 and B4 are provided on the first walking valve plate, and the working ports A5 and B5 are provided on the second walking valve plate. The two walking valve plates respectively form a hydraulically controlled second three-position six-way valve through the internal valve stem. The control ports a4, b4, a5, and b5 provided on the two walking valve plates are externally connected to the pilot valve to control the commutation of the valve plates; pressure compensation valves are respectively provided in the two walking valve plates. The two second three-position six-way valves are respectively connected between the oil inlet ports P, P1 and the working ports A4, B4 and the working ports A5, B5 through the corresponding pressure compensation valves.

[0019] As a further preference, when the second three-position six-way valve is in the middle position, its P port is cut off, and the oil return port T is connected to the working ports A4, B4 or A5, B5. At this time, the walking motor is stationary; when the valve is in the lower position, the oil inlet ports P, P1 are connected to the working port A4 or A5, and the oil return port T is connected to the working port B4 or B5. At this time, the walking motor is in the forward rotation state; when the valve is in the upper position, the oil inlet ports P, P1 are connected to the working port B4 or B5, and the oil return port T is connected to the working port A4 or A5. At this time, the walking motor is in the reverse rotation state.

[0020] As a further preference, the control ports at one end of each pressure compensation valve are respectively connected to the LS ports of the corresponding three-position six-way valve or three-position seven-way valve and are respectively connected to the feedback port LS provided on the oil inlet propulsion valve plate through the shuttle valve and the feedback oil passage provided in the corresponding valve plate. The other oil inlet ends of each shuttle valve are respectively connected to the oil outlet ends of the shuttle valves in the adjacent valve plates through the feedback oil passage, and are used to select the valve plate with the maximum inlet oil pressure to feedback to the variable pump.

[0021] The beneficial effects of the present invention are:

[0022] 1. Since a quick - advancing valve plate and an oil - inlet advancing valve plate are successively connected to one side of the rotary valve plate, the combination of the hydraulic control three - position six - way valve formed by the quick - advancing valve plate and the hydraulic control two - position four - way valve formed by the oil - inlet advancing valve plate enables the adjustable advancing speeds of two externally connected feed cylinders and the adjustment according to actual requirements. When the rotary motor needs to work, the auxiliary pump externally connected to the working ports A and B on the oil - inlet advancing valve plate supplies oil to the feed cylinders, and the main pump externally connected to this main valve supplies oil to the rotary motor, realizing the slow advancing or retracting of the feed cylinders while the motor rotates, ensuring that the rotary motor obtains sufficient flow supply, guaranteeing its stable operation, and improving the overall reliability. When the rotary motor does not need to work, the main pump externally connected to this main valve supplies oil to the feed cylinders, realizing the quick advancing or retracting of the feed cylinders and improving the overall working efficiency.

[0023] 2. Since the rotary valve plate includes a first rotary valve plate, a second rotary valve plate, and a third rotary valve plate arranged in sequence, the first and third rotary valve plates respectively form hydraulic control three - position seven - way valves through the internal valve rods. And the two three - position seven - way valves are respectively connected between the oil - inlet ports P, P1 and the working ports A3, B3 on the second rotary valve plate through the corresponding pressure - compensating valves, enabling the combined oil supply to the rotary motor through two small - flow valve plates during operation. Under the condition of low - flow oil supply, it can meet the high - flow operation requirements of the rotary motor, and can ensure that the working requirements of the motor are met without increasing the overall volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the structural schematic diagram of the present invention.

[0025] Figure 2 is Figure 1 the top view of

[0026] Figure 3 is Figure 1 the bottom view of

[0027] Figure 4 is Figure 1 the right view of

[0028] Figure 5 is the hydraulic schematic diagram of the present invention.

[0029] Figure 6 is the hydraulic schematic diagram of the first three - position six - way valve.

[0030] Figure 7 is the hydraulic schematic diagram of the three - position seven - way valve.

[0031] Figure 8 is the hydraulic schematic diagram of the second three - position six - way valve.

[0032] In the figure: oil inlet propulsion valve plate 1, fast propulsion valve plate 2, first rotary valve plate 3, second rotary valve plate 4, third rotary valve plate 5, first walking valve plate 6, second walking valve plate 7, oil inlet valve plate 8, pressure reducing valve 9, second overflow valve 10, first overflow valve 11, two-position four-way valve 12, pressure compensating valve 13, first three-position six-way valve 14, pressure compensating valve 15, three-position seven-way valve 16, pressure compensating valve 17, second three-position six-way valve 18, shuttle valve 19. Specific implementation mode

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1 to 8 shown, a main valve of a directional drilling rig involved in the present invention includes an oil inlet valve plate 8, a walking valve plate, a rotary valve plate, a fast propulsion valve plate 2, and an oil inlet propulsion valve plate 1 connected in sequence. An oil inlet P and an oil return port T are provided on the oil inlet valve plate 8, and a first overflow valve 11 is installed. The first overflow valve 11 is connected between the oil inlet P and the oil return port T; an oil inlet P1, a control port a0, an oil return port T1, and working ports A, B, A1, and B1 are provided on the oil inlet propulsion valve plate 1, and a second overflow valve 10 is installed. The oil inlet P is communicated with the oil inlet P1 through oil channels provided in multiple valve plates for externally connecting a main pump to supply oil; the oil return port T1 is communicated with the oil return port T through an internal oil channel, and the second overflow valve 10 is connected between the oil inlet P1 and the oil return port T1; working ports A2, B2, and control ports a1, b1 are provided on the fast propulsion valve plate 2. The working port A1 is correspondingly communicated with the working port A2, and the working port B1 is correspondingly communicated with the working port B2 through internal oil channels for externally connecting two feed cylinders.

[0035] The oil inlet propulsion valve plate 1 forms a hydraulic control two-position four-way valve 12 through a valve rod provided inside. The P and T ports of the two-position four-way valve 12 are respectively communicated with the working ports A and B in one-to-one correspondence, and the A and B ports are respectively communicated with the working ports A1 and B1 in one-to-one correspondence. The control end of the two-position four-way valve 12 is communicated with the control port a0 for externally connecting a pilot valve to control the state of the two-position four-way valve 12.

[0036] When the two-position four-way valve 12 is in the upper position, its P port is connected to the A port, and the B port is connected to the T port, so that the working port A is connected to the working ports A1 and A2, and the working port B is connected to the working ports B1 and B2, for controlling the feed cylinder to be in the slow forward state; when the two-position four-way valve 12 is in the lower position, its P, T, A, and B ports are respectively cut off, so that the working ports A and B are in a cut-off state with the working ports A1, A2, B1, and B2, for controlling the feed cylinder to be in the fast forward state.

[0037] On the oil inlet propulsion valve plate 1, there are also an oil supply port X, an oil return port Y, and a pressure reducing valve 9 is installed. The oil inlet end of the pressure reducing valve 9 is connected to the oil inlet P1, the oil return end is connected to the oil return port Y, and the output end is connected to the oil supply port X, for externally connecting a pilot valve. The limiting pressure of the pressure reducing valve 9 is 35 bar, and the limiting pressures of the first overflow valve 11 and the second overflow valve 10 are 280 bar.

[0038] The fast propulsion valve plate 2 forms a hydraulically controlled first three-position six-way valve 14 through the valve stem provided inside it, and a pressure compensation valve 13 is provided inside the fast propulsion valve plate 2. The first three-position six-way valve 14 is connected between the oil inlet ports P, P1 and the working ports A2, B2 through the pre-set pressure compensation valve 13. The control ends at both ends of the first three-position six-way valve 14 are respectively connected to the control ports a1 and b1 correspondingly, for externally connecting a pilot valve to control the state of the fast propulsion valve plate 2.

[0039] When the first three-position six-way valve 14 is in the middle position, the oil inlet ports P, P1 and the oil return ports T, T1 are disconnected from the working ports A1, A2, B1, B2, and the LS port is connected to the oil return port T. At this time, the feed cylinder is stationary; when the valve is in the lower position, the oil inlet ports P, P1 are connected to the working ports A1, A2 and are throttled and conducted to the LS port, and the working ports B1, B2 are connected to the oil return port T. At this time, the feed cylinder is in the fast forward state; when the valve is in the upper position, the oil inlet ports P, P1 are connected to the working ports B1, B2 and are throttled and conducted to the LS port, and the working ports A1, A2 are connected to the oil return port T. At this time, the oil cylinder is in the fast backward state.

[0040] The rotary valve plate includes a first rotary valve plate 3, a second rotary valve plate 4, and a third rotary valve plate 5 arranged in sequence. The first rotary valve plate 3 is adjacent to the quick advance valve plate 2. A pair of control ports a2 and b2 are provided at one end of the first rotary valve plate 3. A pair of control ports a3 and b3 are provided at one end of the third rotary valve plate 5. A pair of working ports A3 and B3 are provided on the second rotary valve plate 4. The first rotary valve plate 3 and the third rotary valve plate 5 respectively form a hydraulically controlled three-position seven-way valve 16 through the valve stems inside. Pressure compensation valves 15 are respectively provided inside the first and third rotary valve plates. The two three-position seven-way valves 16 are respectively connected between the oil inlet ports P, P1 and the working ports A3, B3 through the corresponding pre-positioned pressure compensation valves 15. The control ends at both ends of the two three-position seven-way valves 16 are respectively communicated with the control ports a2, b2 and a3, b3 correspondingly, for externally connecting a pilot valve to control the states of the two three-position seven-way valves 16.

[0041] When the two three-position seven-way valves 16 are in the middle position, their P ports are cut off, and the working ports A3, B3 are throttled and communicated with the oil return port T and the LS port. At this time, the motor is stationary and does not rotate. When the valve is in the lower position, the oil inlet ports P, P1 are communicated with the working port A3 and are throttled and conducted with the LS port, and the working port B3 is communicated with the oil return port T. At this time, the motor is in the forward rotation state. When the valve is in the upper position, the oil inlet ports P, P1 are communicated with the working port B3 and are throttled and conducted with the LS port, and the working port A3 is communicated with the oil return port T. At this time, the motor is in the reverse rotation state.

[0042] There are two walking valve plates, which are the first walking valve plate 6 and the second walking valve plate 7 in sequence. A pair of working ports A4, B4 and a pair of control ports a4, b4 are provided on the first walking valve plate 6. A pair of working ports A5, B5 and a pair of control ports a5, b5 are provided on the second walking valve plate 7. The two walking valve plates respectively form a hydraulically controlled second three-position six-way valve 18 through the valve stems inside. The two walking valve plates are controlled to change directions by externally connecting a pilot valve through the control ports a4, b4 and a5, b5. Pressure compensation valves 17 are respectively provided inside the two walking valve plates. The two second three-position six-way valves 18 are respectively connected between the oil inlet ports P, P1 and the working ports A4, B4 and between the oil inlet ports P, P1 and the working ports A5, B5 through the corresponding pre-positioned pressure compensation valves 17, for controlling the start of the walking motor.

[0043] When the second three-position six-way valve 18 is in the neutral position, its P port is blocked, and the A and B ports are throttled and connected to the LS port and the T port, so that the working ports A4, B4 or A5, B5 are throttled and connected to the oil return port T. At this time, the traveling motor is stationary; when the valve is in the lower position, its P port is connected to the A port and throttled and connected to the LS port, and the B port is connected to the T port, so that the oil inlet ports P, P1 are connected to the working port A4 or A5 and throttled and connected to the corresponding LS port, and the oil return port T is connected to the working port B4 or B5. At this time, the traveling motor rotates forward; when the valve is in the upper position, its P port is connected to the B port and throttled and connected to the LS port, and the A port is connected to the T port, so that the oil inlet ports P, P1 are connected to the working port B4 or B5 and throttled and connected to the LS port, and the oil return port T is connected to the working port A4 or A5. At this time, the traveling motor rotates in reverse.

[0044] One control port at one end of each of the pressure compensation valves 13, 15, 17 is respectively communicated with the LS port of the corresponding three-position six-way valve or three-position seven-way valve 16 and is respectively communicated with the feedback port LS provided on the oil inlet propulsion valve plate 1 through the shuttle valve 19 and the feedback oil passage provided in the corresponding valve plate. The other oil inlet end of each shuttle valve 19 is respectively communicated with the oil outlet end of the shuttle valve in the adjacent valve plate through the feedback oil passage, and is used to select the valve plate with the maximum oil inlet pressure and feedback it to the variable pump.

[0045] During operation, the oil inlet ports P, P1 are jointly connected to a reserved interface of a variable pump, the five pairs of working ports A1, B1, A2, B2, A3, B3, A4, B4 and A5, B5 are respectively connected to the reserved interfaces of the corresponding actuators through oil pipes, and the oil return ports T1, T2 are respectively connected to the fuel tank. Among them, the working ports A1, B1 and the working ports A2, B2 respectively control the fast or slow propulsion of the feed cylinder, the working ports A3, B3 control the rotary motor, and the working ports A4, B4 and the working ports A5, B5 control the start of the traveling motor.

[0046] In the initial state, each three-position seven-way valve 16 and three-position six-way valve are in the neutral position, and the pressure compensation valve is in the upper position. At this time, the oil entering from the oil inlet ports P, P1 passes through the first and second overflow valves and is communicated with the oil return ports T, T1, so that the valve can unload oil when in the neutral position, avoiding excessive system pressure in the valve plate during the neutral position, resulting in pressure buildup, heat generation, and damage to the valve body; at the same time, the oil entering from the oil inlet ports P, P1 passes through the pressure reducing valve 9 and is communicated with the oil supply port X and the oil return ports T, T1, so that the external pilot valve can be supplied with oil to control the valve body to change direction, avoiding damage to the valve body due to excessive pilot valve pressure. The specific operation is as follows:

[0047] 1. When it is necessary to quickly advance the operation, control the handle of the externally connected pilot valve to admit oil from the control port a0, push the valve stem in the oil inlet advancing valve plate 1 to act, so that the two-position four-way valve 12 formed by the oil inlet advancing valve plate 1 is in the lower position. At this time, the working ports A and B are disconnected from the working ports A1, B1, A2, and B2, and the oil entering from the oil inlet ports P and P1 supplies oil to the working ports A1, B1, A2, and B2 separately; if the pilot valve handle is controlled to admit oil from the control port a1, push the valve stem in the quick advancing valve plate 2 to act, so that the first three-position six-way valve 14 formed by the quick advancing valve plate 2 is in the lower position. At this time, the oil entering from the oil inlet ports P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and the first three-position six-way valve 14 to reach the working ports A1 and A2 and flows into the two feed cylinders. The oil returned from the feed cylinders flows out from the working ports B1 and B2 through the first three-position six-way valve 14 and the oil return ports T and T1. At this time, the main valve controls the feed cylinders to be in the quick advancing state; if the pilot valve handle is controlled to admit oil from the control port b1, push the valve stem of the quick advancing valve plate 2 to act, so that the first three-position six-way valve 14 formed by the quick advancing valve plate 2 is in the upper position. At this time, the oil entering from the oil inlet ports P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and the first three-position six-way valve 14 to reach the working ports B1 and B2, and the oil in the working ports A1 and A2 flows out from the oil return ports T and T1. At this time, the main valve controls the feed cylinders to be in the quick retracting state.

[0048] 2. When it is necessary to slowly advance the operation, control the control port a0 of the two-position four-way valve 12 through the pilot valve not to admit oil, so that the two-position four-way valve 12 formed by the oil inlet advancing valve plate 1 is in the upper position. At this time, the working ports A and B are connected to the working ports A1, B1, A2, and B2. The working ports A and B are connected to the auxiliary pump through the posture adjustment valve of the directional drilling rig valve group. At this time, control the control ports a1 and b1 at both ends of the first three-position six-way valve 14 not to admit oil through the pilot valve. The first three-position six-way valve 14 remains in the middle position. The oil of the auxiliary pump enters from the working port A or B connected to the posture adjustment valve and supplies oil to the working ports A1, A2 or B1, B2 through the two-position four-way valve 12, driving the feed cylinders to achieve slow operation. That is, during slow advancement operation, the cylinders are mainly controlled by the working ports A and B connected to the posture adjustment valve and have nothing to do with the quick advancing valve plate 2.

[0049] 3. When the drill bit needs to rotate, the oil pump supplies oil from the oil inlets P and P1 into the three rotary valve plates. The first rotary valve plate 33 and the third rotary valve plate 5 jointly supply oil to the rotary motor. The oil flows together in the second rotary valve plate 4 and flows out from the working ports A3 and B3. By introducing oil from a2 and a3 through the pilot handle, the valve stems in the first and third rotary valve plates are pushed to act, so that the three-position seven-way valve 16 formed by the first and third rotary valve plates is in the lower position. At this time, the oil entering from the oil inlets P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and enters the working port A3 connected to the first and third rotary valve plates. The oil in the working port B3 flows out from the oil return ports T and T1. At this time, the main valve controls the motor to be in the forward rotation state. If the control pilot handle introduces oil from b2 and b3, the valve stems in the first and third rotary valve plates are pushed to act, so that the three-position seven-way valve 16 formed by the first and third rotary valve plates is in the upper position. At this time, the oil entering from the oil inlets P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and enters the working port B3. The oil in the working port A3 flows out from the oil return ports T and T1. At this time, the main valve controls the motor to be in the reverse rotation state.

[0050] 4. When walking operation is required, the oil pump supplies oil from the oil inlets P and P1 into the two travel valve plates. The first travel valve plate 6 and the second travel valve plate 7 respectively supply oil to a travel motor. By controlling the introduction of oil from the control ports a4 and a5 through an external pilot valve handle, the valve stems in the first and second travel valve plates are pushed to act, so that the second three-position six-way valve 18 formed by the first and second travel valve plates is in the lower position. At this time, the oil entering from the oil inlets P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and enters the working ports A4 and A5 connected to the first and second travel valve plates. The oil in the working ports B4 and B5 flows out from the oil return ports T and T1. At this time, the travel motor corresponding to the main valve is in the forward rotation state, and the directional drilling rig moves forward. If the external pilot valve handle is controlled to introduce oil from the control ports b4 and b5 to push the valve stems in the first and second travel valve plates to act, so that the second three-position six-way valve 18 formed by the first and second travel valve plates is in the upper position. At this time, the oil entering from the oil inlets P and P1 enters the pressure compensation valve, causing the pressure compensation valve to change direction and stabilize in the middle position. The oil passes through the pressure compensation valve and the second three-position six-way valve 18 and enters the working ports B4 and B5. The oil in the working ports A4 and A5 flows out from the oil return ports T and T1. At this time, the travel motor corresponding to the main valve is in the reverse rotation state, causing the directional drilling rig to move backward.

[0051] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those skilled in the art, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples described herein.

Claims

1. A main valve of a directional drilling rig, comprising an oil inlet valve plate, a traveling valve plate and a rotary valve plate. An oil inlet port P and an oil return port T are provided on the oil inlet valve plate. It is characterized in that: A quick - advancing valve plate and an oil - inlet advancing valve plate are successively connected to one side of the rotary valve plate. An oil - inlet P1, a control port a0, and working ports A, B, A1, B1 are provided on the oil - inlet advancing valve plate. The oil - inlets P and P1 are in communication with each other. Working ports A2, B2, and control ports a1, b1 are provided on the quick - advancing valve plate. The working ports A1, B1 are respectively in corresponding communication with the working ports A2, B2 for externally connecting two feed cylinders. The oil - inlet advancing valve plate forms a hydraulically controlled two - position four - way valve through the internal valve stem. The P and T ports of the two - position four - way valve are respectively in corresponding communication with the working ports A and B. The A and B ports are respectively in communication with the working ports A1, B1. The control end of the two - position four - way valve is in communication with the control port a0 for externally connecting a pilot valve to control the state of the two - position four - way valve. The quick - advancing valve plate forms a hydraulically controlled first three - position six - way valve through the valve stem provided inside it, and a pressure - compensating valve is provided inside the quick - advancing valve plate. The first three - position six - way valve is connected between the oil - inlets P, P1 and the working ports A2, B2 through the pressure - compensating valve. The control ends at both ends of the first three - position six - way valve are respectively in corresponding communication with the control ports a1, b1 for externally connecting a pilot valve to control the state of the quick - advancing valve plate.

2. The main valve of a directional drilling rig according to claim 1, characterized in that: in An oil - supply port X is also provided on the oil - inlet advancing valve plate, and a pressure - reducing valve is installed. The inlet end of the pressure - reducing valve is in communication with the oil - inlet P1, and the output end is in communication with the oil - supply port X for externally connecting a pilot valve.

3. The main valve of a directional drilling rig according to claim 1, characterized in that: The rotary valve plate includes a first rotary valve plate, a second rotary valve plate, and a third rotary valve plate arranged in sequence. A pair of control ports a2, b2 and a3, b3 are respectively provided on the first and third rotary valve plates. A pair of working ports A3, B3 are provided on the second rotary valve plate. The first rotary valve plate and the third rotary valve plate respectively form hydraulically controlled three - position seven - way valves through the internal valve stems. Pressure - compensating valves are respectively provided inside the first and third rotary valve plates. The two three - position seven - way valves are respectively connected between the oil - inlets P, P1 and the working ports A3, B3 through the corresponding pressure - compensating valves. The control ends at both ends of the two three - position seven - way valves are respectively in corresponding communication with the control ports a2, b2 and a3, b3 for externally connecting a pilot valve to control the state of the rotary valve plate.

4. The main valve of a directional drilling rig according to claim 1, characterized in that: When the two - position four - way valve is in the upper position, the working port A is in communication with the working ports A1, A2, and the working port B is in communication with the working ports B1, B2, for controlling the feed cylinder to be in a slow - advancing state. When the two - position four - way valve is in the lower position, the working ports A, B are in a cut - off state with the working ports A1, A2, B1, B2, for controlling the feed cylinder to be in a fast - advancing state.

5. The main valve of a directional drilling rig according to claim 1, characterized in that: When the first three - position six - way valve is in the middle position, the oil - inlets P, P1 and the oil - return port T are disconnected from the working ports A1, A2, B1, B2. At this time, the feed cylinder is stationary. When the valve is in the lower position, the oil - inlets P, P1 are in communication with the working ports A1, A2, and the working ports B1, B2 are in communication with the oil - return port T. At this time, the feed cylinder is in a fast - advancing state. When the valve is in the upper position, the oil - inlets P, P1 are in communication with the working ports B1, B2, and the working ports A1, A2 are in communication with the oil - return port T. At this time, the feed cylinder is in a fast - retreat state.

6. The main valve of a directional drilling rig according to claim 3, characterized in that: When the three-position seven-way valve is in the middle position, its P port is cut off, the oil return port T is connected to the working ports A3 and B3, and the motor is stationary at this time; when the valve is in the lower position, the inlet ports P and P1 are connected to the working port A3, and the working port B3 is connected to the oil return port T, and the motor is in the forward rotation state at this time; when the valve is in the upper position, the inlet ports P and P1 are connected to the working port B3, and the working port A3 is connected to the oil return port T, and the motor is in the reverse rotation state at this time.

7. The main valve of a directional drilling rig according to claim 1, characterized in that: There are two walking valve plates, which are the first walking valve plate and the second walking valve plate in sequence. The working ports A4 and B4 are provided on the first walking valve plate, and the working ports A5 and B5 are provided on the second walking valve plate. The two walking valve plates respectively form a hydraulically controlled second three-position six-way valve through the internal valve stems. The control ports a4, b4, a5, and b5 provided on the two walking valve plates are externally connected to a pilot valve to control the commutation of the valve plates; pressure compensation valves are respectively provided in the two walking valve plates, and the two second three-position six-way valves are respectively connected between the inlet ports P, P1 and the working ports A4, B4 and the working ports A5, B5 through the corresponding pressure compensation valves.

8. The main valve of a directional drilling rig according to claim 7, characterized in that: When the second three-position six-way valve is in the middle position, its P port is cut off, the oil return port T is connected to the working ports A4, B4 or A5, B5, and the walking motor is stationary at this time; when the valve is in the lower position, the inlet ports P, P1 are connected to the working port A4 or A5, and the oil return port T is connected to the working port B4 or B5, and the walking motor rotates forward at this time; when the valve is in the upper position, the inlet ports P, P1 are connected to the working port B4 or B5, and the oil return port T is connected to the working port A4 or A5, and the walking motor rotates in reverse at this time.

9. A main valve of a directional drilling rig according to any one of claims 1-8, characterized in that: The control ports at one end of each pressure compensation valve are respectively communicated with the LS ports of the corresponding three-position six-way valve or three-position seven-way valve and are respectively communicated with the feedback port LS provided on the inlet propulsion valve plate through the shuttle valves and feedback oil channels provided in the corresponding valve plates. The other inlet ends of each shuttle valve are respectively communicated with the outlet ends of the shuttle valves in the adjacent valve plates through the feedback oil channels, and are used to select the valve plate with the maximum inlet pressure to feedback to the variable pump.

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