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] This utility model relates to a hydraulic valve, and more particularly to a main valve for a directional drilling rig. Background Technology

[0002] Directional drilling rigs are pipeline construction tools used in the engineering industry, primarily for oil, natural gas, and some municipal pipeline projects. Large directional drilling rigs are used for positioning drilling, hole reaming, hole cleaning, and pipeline pullback before pipeline construction. During operation, the operator needs to remotely control the machine from outside, making it crucial to ensure stable and responsive operation of the directional drilling rig.

[0003] When a directional drilling rig is operating, the working status of the valve assembly needs to be adjusted according to the working conditions, and the valve assembly is required to respond quickly. Existing directional drilling rig main valves typically include an inlet valve, a feed valve, a rotary valve, and two travel valves connected in sequence. Oil entering through the inlet valve flows into the feed valve, rotary valve, and two travel valves, thereby controlling the operation of the feed cylinder, rotary motor, and two travel motors respectively. Existing directional drilling rig main valves have the following problems:

[0004] 1. The controlled feed cylinder has a fixed and non-adjustable propulsion speed, which cannot be adjusted according to actual needs, resulting in low system efficiency and insufficient flexibility.

[0005] 2. The motor requires a high flow rate. Using a high flow rate oil supply will result in an excessively large overall size of the valve assembly, affecting the system layout and compactness. Using a low flow rate oil supply will make it difficult to meet the working requirements. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a main valve for a directional drilling rig, which can make the feed cylinder advance speed adjustable and can be adjusted according to actual needs, thereby improving the overall working efficiency.

[0007] The technical solution of this utility model is as follows:

[0008] A main valve for a directional drilling rig includes an inlet valve plate, a travel valve plate, and a rotary valve plate. The inlet valve plate has an inlet port P and an outlet port T. Its special feature is that a rapid propulsion valve plate and an inlet propulsion valve plate are sequentially connected to one side of the rotary valve plate. The inlet propulsion valve plate has an inlet port P1, a control port a0, and working ports A, B, A1, and B1. The inlets P and P1 are interconnected. The rapid propulsion valve plate has working ports A2 and B2 and control ports a1 and b1. The working ports A1 and B1 are respectively connected to the working ports A2 and B2 for connecting two external feed cylinders.

[0009] The 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 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 connect an external pilot valve to control the state of the two-position four-way valve.

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

[0011] As a further preferred option, the oil inlet propulsion valve plate is also provided with an oil supply port X 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, for connecting an external pilot valve.

[0012] As a further preferred embodiment, the rotary valve plate includes a first rotary valve plate, a second rotary valve plate, and a third rotary valve plate arranged sequentially. The first and third rotary valve plates are respectively provided with a pair of control ports a2, b2 and a3, b3, and the second rotary valve plate is provided with a pair of working ports A3, B3. The first and third rotary valve plates form hydraulically controlled three-position seven-way valves through internal valve stems. Pressure compensation valves are respectively provided in 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 corresponding pressure compensation valves. The control terminals at both ends of the two three-position seven-way valves are respectively connected to the control ports a2, b2 and a3, b3, for connecting to an external pilot valve to control the state of the rotary valve plate.

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

[0014] As a further preferred embodiment, when the first three-position six-way valve is in the neutral position, the oil inlet ports P, P1 and the oil return port T are disconnected from the working ports A1, A2, B1 and B2, and the feed cylinder remains stationary.

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

[0017] As a further preferred embodiment, when the three-position seven-way valve is in the middle position, its P port is closed, and the return port T is connected to the working ports A3 and B3, at which time the motor is stationary and does not rotate; 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 return port T, at which time the motor is in the forward rotation state; 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 return port T, at which time the motor is in the reverse rotation state.

[0018] As a further preferred embodiment, there are two travel valve plates, namely a first travel valve plate and a second travel valve plate. The first travel valve plate has working ports A4 and B4, and the second travel valve plate has working ports A5 and B5. The two travel valve plates form hydraulically controlled second three-position six-way valves through internal valve stems. The switching of the valve plates is controlled by external pilot valves connected to the control ports a4, b4 and a5, b5 on the two travel valve plates. Pressure compensation valves are provided in the two travel valve plates respectively. The two second three-position six-way valves are connected between the oil inlet ports P and P1 and the working ports A4 and B4 and A5 and B5 respectively through corresponding pressure compensation valves.

[0019] As a further preferred embodiment, when the second three-position six-way valve is in the middle position, its P port is closed, and the return port T is connected to the working ports A4, B4 or A5, B5, at which time the travel motor is stationary and does not rotate; when the valve is in the lower position, the oil inlet ports P and P1 are connected to the working ports A4 or A5, and the return port T is connected to the working ports B4 or B5, at which time the travel motor rotates forward; when the valve is in the upper position, the oil inlet ports P and P1 are connected to the working ports B4 or B5, and the return port T is connected to the working ports A4 or A5, at which time the travel motor rotates in reverse.

[0020] As a further preferred embodiment, the control port at one end of each pressure compensation valve is connected to the LS port of the corresponding three-position six-way valve or three-position seven-way valve, and is connected to the feedback port LS on the oil inlet propulsion valve through the shuttle valve and feedback oil passage in the corresponding valve plate. The other oil inlet end of each shuttle valve is connected to the oil outlet end of the shuttle valve in the adjacent valve plate through the feedback oil passage, which is used to select the valve plate pressure with the largest oil inlet pressure to feed back to the variable pump.

[0021] The beneficial effects of this utility model are:

[0022] 1. Because a quick-release valve plate and an oil inlet valve plate are connected sequentially on one side of the rotary valve plate, the hydraulically controlled three-position six-way valve formed by the quick-release valve plate and the hydraulically controlled two-position four-way valve formed by the oil inlet valve plate cooperate with each other to achieve adjustable propulsion speed of the two external feed cylinders, which can be adjusted according to actual needs. When the rotary motor needs to work, the auxiliary pump connected to the working ports A and B on the oil inlet valve plate supplies oil to the feed cylinders, and the main pump connected to the main valve supplies oil to the rotary motor. This achieves simultaneous rotation of the motor and slow propulsion or retraction of the feed cylinders, ensuring that the rotary motor receives sufficient flow, ensuring its stable operation, and improving overall reliability. When the rotary motor does not need to work, the main pump connected to the main valve supplies oil to the feed cylinders, achieving rapid propulsion or retraction of the feed cylinders and improving overall work 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 form hydraulically controlled three-position seven-way valves through internal valve stems; and the two three-position seven-way valves are respectively connected between the oil inlet ports P and P1 and the working ports A3 and B3 provided on the second rotary valve plate through corresponding pressure compensation valves, it can realize that the rotary motor can be supplied with oil by merging through two valve plates with small flow rates during operation. Under low flow rate oil supply conditions, the high flow rate operation requirements of the rotary motor can be met, and the working requirements of the motor can be met without increasing the overall volume. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model.

[0025] Figure 2 yes Figure 1 Top view.

[0026] Figure 3 yes Figure 1 A bottom view.

[0027] Figure 4 yes Figure 1 The right view.

[0028] Figure 5 This is a hydraulic schematic diagram of this utility model.

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

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

[0031] Figure 8 This is the hydraulic schematic diagram of a second or third position six-way valve.

[0032] In the diagram: Oil inlet propulsion valve 1, rapid propulsion valve 2, first rotary valve 3, second rotary valve 4, third rotary valve 5, first travel valve 6, second travel valve 7, oil inlet valve 8, pressure reducing valve 9, second relief valve 10, first relief valve 11, two-position four-way valve 12, pressure compensation valve 13, first three-position six-way valve 14, pressure compensation valve 15, three-position seven-way valve 16, pressure compensation valve 17, second three-position six-way valve 18, shuttle valve 19. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0034] like Figures 1 to 8 As shown, this utility model relates to a main valve for a directional drilling rig, comprising an inlet valve plate 8, a travel valve plate, a rotary valve plate, a rapid propulsion valve plate 2, and an inlet propulsion valve plate 1 connected in sequence. The inlet valve plate 8 has an inlet port P and a return port T, and a first overflow valve 11 is installed thereon, connected between the inlet port P and the return port T. The inlet propulsion valve plate 1 has an inlet port P1, a control port a0, a return port T1, and working ports A, B, A1, B1, and a second overflow valve 10 is installed thereon. The oil inlet P and oil inlet P1 are interconnected through oil passages located within multiple valve plates, and are used to supply oil to an external main pump. The oil return port T1 and oil return port T are connected through internal oil passages. The second overflow valve 10 is connected between the oil inlet P1 and the oil return port T1. The rapid propulsion valve plate 2 is provided with working ports A2 and B2 and control ports a1 and b1. The working ports A1 and A2, and working ports B1 and B2 are respectively connected through internal oil passages, and are used to connect two external feed cylinders.

[0035] The oil inlet propulsion valve plate 1 forms a hydraulically controlled two-position four-way valve 12 through a valve stem located inside it. The P and T ports of the two-position four-way valve 12 are respectively connected to the working ports A and B, and 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 12 is connected to the control port a0, which is used to connect an external 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 its 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, which is used to control the feed cylinder to be in a slow advancing 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 cut off from the working ports A1, A2, B1, and B2, which is used to control the feed cylinder to be in a fast advancing state.

[0037] The oil inlet propulsion valve plate 1 is also provided with an oil supply port X and an oil return port Y, and a pressure reducing valve 9 is installed thereon. The oil inlet end of the pressure reducing valve 9 is connected to the oil inlet port 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 connecting an external pilot valve. The pressure reducing valve 9 has a limited pressure of 35 bar, and the first relief valve 11 and the second relief valve 10 have limited pressures of 280 bar.

[0038] The rapid propulsion valve plate 2 forms a hydraulically controlled first three-position six-way valve 14 through a valve stem located inside it, and a pressure compensation valve 13 is provided inside the rapid propulsion valve plate 2. The first three-position six-way valve 14 is connected between the oil inlet ports P and P1 and the working ports A2 and B2 through the front-mounted pressure compensation valve 13. The control terminals at both ends of the first three-position six-way valve 14 are respectively connected to the control ports a1 and b1, and are used to connect an external pilot valve to control the state of the rapid propulsion valve plate 2.

[0039] When the first three-position six-way valve 14 is in the middle position, the oil inlet ports P and P1 and the oil return ports T and T1 are disconnected from the working ports A1, A2, B1, and 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 and P1 are connected to the working ports A1 and A2 and are throttled through the LS port. The working ports B1 and B2 are connected to the oil return port T. At this time, the feed cylinder is in a rapid advancing state. 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 are throttled through the LS port. The working ports A1 and A2 are connected to the oil return port T. At this time, the cylinder is in a rapid retracting 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 sequentially. The first rotary valve plate 3 is adjacent to the rapid propulsion valve plate 2. A pair of control ports a2 and b2 are provided at one end of the first rotary valve plate 3, and 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 form hydraulically controlled three-position seven-way valves 16 through internal valve stems. Pressure compensation valves 15 are provided in the first and third rotary valve plates respectively. The two three-position seven-way valves 16 are connected between the oil inlet ports P and P1 and the working ports A3 and B3 respectively through corresponding front-mounted pressure compensation valves 15. The control ends at both ends of the two three-position seven-way valves 16 are respectively connected to the control ports a2 and b2 and a3 and b3, respectively, for external pilot valves to control the state 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 closed, and the working ports A3 and B3 are throttled and connected to the return ports T and LS, at which time the motor is stationary and does not rotate; when the valve is in the lower position, the inlet ports P and P1 are connected to the working port A3 and throttled and connected to the LS port, and the working port B3 is connected to the return port T, at which time the motor is in the forward rotation state; when the valve is in the upper position, the inlet ports P and P1 are connected to the working port B3 and throttled and connected to the LS port, and the working port A3 is connected to the return port T, at which time the motor is in the reverse rotation state.

[0042] The travel valve plate consists of two parts, namely a first travel valve plate 6 and a second travel valve plate 7. The first travel valve plate 6 has a pair of working ports A4 and B4 and a pair of control ports a4 and b4. The second travel valve plate 7 has a pair of working ports A5 and B5 and a pair of control ports a5 and b5. The two travel valve plates form hydraulically controlled second three-position six-way valves 18 through internal valve stems. The switching of the two travel valve plates is controlled by external pilot valves connected to control ports a4 and b4 and a5 and b5. Pressure compensation valves 17 are respectively installed in the two travel valve plates. The two second three-position six-way valves 18 are respectively connected between the oil inlet ports P and P1 and the working ports A4 and B4, and between the oil inlet ports P and P1 and the working ports A5 and B5 through corresponding front-mounted pressure compensation valves 17, for controlling the start of the travel motor.

[0043] When the second three-position six-way valve 18 is in the middle position, its P port is closed, and its A and B ports are throttled and connected to the LS and T ports, so that the working ports A4 and B4 or A5 and B5 are throttled and connected to the return port T. At this time, the travel motor is stationary and does not rotate. 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 its B port is connected to the T port, so that the oil inlet ports P and P1 are connected to the working ports A4 or A5 and throttled and connected to the corresponding LS ports, and the return port T is connected to the working ports B4 or B5. At this time, the travel 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 its A port is connected to the T port, so that the oil inlet ports P and P1 are connected to the working ports B4 or B5 and throttled and connected to the LS port, and the return port T is connected to the working ports A4 or A5. At this time, the travel motor rotates in reverse.

[0044] The control port of each pressure compensation valve 13, 15, 17 is connected to the LS port of the corresponding three-position six-way valve or three-position seven-way valve 16, and is connected to the feedback port LS on the oil inlet propulsion valve 1 through the shuttle valve 19 and feedback oil passage in the corresponding valve plate. The other oil inlet end of each shuttle valve 19 is connected to the oil outlet end of the shuttle valve in the adjacent valve plate through the feedback oil passage, which is used to select the valve plate pressure with the largest oil inlet pressure to feed back to the variable pump.

[0045] During operation, the oil inlets P and P1 are 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 connected to the reserved interfaces of their respective actuators via oil pipes. The return ports T1 and T2 are connected to the oil tank. Working ports A1 and B1, and A2 and B2 control the rapid or slow advance of the feed cylinder, respectively. Working ports A3 and B3 control the rotary motor, and working ports A4 and B4, and A5 and B5 control the start of the travel motor.

[0046] In the initial state, each three-position seven-way valve 16 and three-position six-way valve is in the neutral position, and the pressure compensation valve is in the upper position. At this time, the oil entering through the inlet ports P and P1 is connected to the return ports T and T1 through the first and second relief valves, which can realize oil discharge when the valve is in the neutral position, avoiding excessive pressure in the valve plate, which could lead to overheating and damage to the valve body. At the same time, the oil entering through the inlet ports P and P1 is connected to the supply port X and the return ports T and T1 through the pressure reducing valve 9, which can realize oil supply to the external pilot valve to control the valve body switching, avoiding excessive pressure in the pilot valve and damage to the valve body. The specific operation is as follows:

[0047] 1. When rapid advancement is required, the pilot valve handle is controlled to allow oil to enter from control port a0, which actuates the valve stem in the oil inlet advance valve plate 1, causing the two-position four-way valve 12 formed by the oil inlet advance valve plate 1 to be 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 inlets P and P1 supplies oil to the working ports A1, B1, A2, and B2 separately. If the pilot valve handle is controlled to allow oil to enter from control port a1, it actuates the valve stem in the rapid advance valve plate 2, causing the first three-position six-way valve 14 formed by the rapid advance valve plate 2 to be 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 switch and stabilize in the neutral position. The oil passes through the pressure compensation valve and the first three-position six-way valve 14. The oil reaches the working ports A1 and A2 and flows into the two feed cylinders. The oil returning from the feed cylinders flows out from the working ports B1 and B2 through the first three-position six-way valve 14 and the return ports T and T1. At this time, the main valve controls the feed cylinder to be in a rapid advance state. If the pilot valve handle is controlled to enter oil from the control port b1, it pushes the valve stem of the rapid advance valve plate 2 to move, so that the first three-position six-way valve 14 formed by the rapid advance valve plate 2 is in the upper position. At this time, the oil entering from the inlet ports P and P1 enters the pressure compensation valve, so that the pressure compensation valve is reversed and stabilized in the middle position. The oil reaches the working ports B1 and B2 through the pressure compensation valve and the first three-position six-way valve 14. The oil in the working ports A1 and A2 flows out from the return ports T and T1. At this time, the main valve controls the feed cylinder to be in a rapid retreat state.

[0048] 2. When slow-speed advance is required, the pilot valve controls the control port a0 of the two-position four-way valve 12 to prevent oil from entering, so that the two-position four-way valve 12 formed by the oil inlet advance valve plate 1 is in the upper position. At this time, working ports A and B are connected to working ports A1, B1, A2, and B2. These working ports A and B are connected to the auxiliary pump through the attitude adjustment valve of the directional drilling rig valve group. At this time, the pilot valve controls the control ports a1 and b1 at both ends of the first three-position six-way valve 14 to prevent oil from entering, and the first three-position six-way valve 14 remains in the middle position. The auxiliary pump oil enters from the working port A or B connected to the attitude adjustment valve and supplies oil to the working ports A1, A2 or B1, B2 through the two-position four-way valve 12, pushing the feed cylinder to achieve slow-speed operation. That is, during slow-speed advance, the cylinder is mainly controlled by the working ports A and B connected to the attitude adjustment valve, and is unrelated to the fast advance valve plate 2.

[0049] 3. When the drill bit needs to rotate, the oil pump supplies oil from 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 into the second rotary valve plate 4 and exits from the working ports A3 and B3. Oil enters from ports a2 and a3 via the pilot handle, pushing the valve stems in the first and third rotary valve plates to move, causing the three-position seven-way valve 16 formed by the first and third rotary valve plates to be in the lower position. At this time, the oil entering from inlets P and P1 enters the pressure compensation valve, causing the pressure compensation valve to switch and stabilize in the middle position. The oil then flows through the pressure compensation valve into the first and third rotary valve plates. In the working port A3 connected to the rotary valve plate, the oil in the working port B3 flows out from the return ports T and T1. At this time, the main valve controls the motor to rotate in the forward direction. If the pilot handle is controlled to enter oil from b2 and b3, it pushes the valve stems of the first and third rotary valve plates to move, 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 inlet ports P and P1 enters the pressure compensation valve, causing the pressure compensation valve to switch and stabilize in the middle position. The oil enters the working port B3 through the pressure compensation valve, and the oil in the working port A3 flows out from the return ports T and T1. At this time, the main valve controls the motor to rotate in the reverse direction.

[0050] 4. When travel operation is required, the oil pump supplies oil from the inlet ports P and P1 into the two travel valve plates. The first travel valve plate 6 and the second travel valve plate 7 each supply oil to a travel motor. The external pilot valve handle controls the oil intake from the control ports a4 and a5, pushing the valve stems within the first and second travel valve plates to move. This causes the second three-position six-way valve 18, formed by the first and second travel valve plates, to be in the lower position. At this time, the oil entering from the inlet ports P and P1 enters the pressure compensation valve, causing the pressure compensation valve to switch and stabilize in the neutral position. The oil then flows through the pressure compensation valve into 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 return port T... When T1 flows out, the travel motor corresponding to the main valve is in forward rotation, and the directional drilling rig moves forward. If the pilot valve handle connected to the control port b4 and b5 is used to push the valve stems of the first and second travel valve plates to move, the second three-position six-way valve 18 formed by the first and second travel valve plates will be in the upper position. At this time, the oil entering from the oil inlet P and P1 will enter the pressure compensation valve, causing the pressure compensation valve to switch and stabilize in the middle position. The oil will enter the working ports B4 and B5 through the pressure compensation valve and the second three-position six-way valve 18. The oil in the working ports A4 and A5 will flow out from the return ports T and T1. At this time, the travel motor corresponding to the main valve is in reverse rotation, causing the directional drilling rig to move backward.

[0051] Although the embodiments of this utility model 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 this utility model. 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, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A main valve for a directional drilling rig, comprising an inlet valve plate, a travel valve plate, and a rotary valve plate, wherein the inlet valve plate is provided with an inlet port P and an outlet port T, characterized in that: A rapid propulsion valve plate and an oil inlet propulsion valve plate are connected sequentially on one side of the rotary valve plate. The oil inlet propulsion valve plate is provided with an oil inlet P1, a control port a0, and working ports A, B, A1, and B1. The oil inlets P and P1 are interconnected. The rapid propulsion valve plate is provided with working ports A2 and B2 and control ports a1 and b1. The working ports A1 and B1 are respectively connected to the working ports A2 and B2 for connecting two external feed cylinders. The 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 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 connect an external pilot valve to control the state of the two-position four-way valve. The rapid propulsion valve plate forms a hydraulically controlled first three-position six-way valve through a valve stem located inside it, and a pressure compensation valve is provided inside the rapid propulsion valve plate. The first three-position six-way valve is connected between the oil inlet ports P and P1 and the working ports A2 and B2 through the pressure compensation valve. The control terminals at both ends of the first three-position six-way valve are respectively connected to the control ports a1 and b1, and are used to connect an external pilot valve to control the state of the rapid propulsion valve plate.

2. The main valve for a directional drilling rig according to claim 1, characterized in that: in The oil inlet propulsion valve plate is also provided with an oil supply port X 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 connect an external pilot valve.

3. The main valve for 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 sequentially. The first and third rotary valve plates are respectively provided with a pair of control ports a2, b2 and a3, b3, and the second rotary valve plate is provided with a pair of working ports A3, B3. The first and third rotary valve plates form hydraulically controlled three-position seven-way valves through internal valve stems. Pressure compensation valves are respectively provided in 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 corresponding pressure compensation valves. The control terminals at both ends of the two three-position seven-way valves are respectively connected to the control ports a2, b2 and a3, b3, for connecting to an external pilot valve to control the state of the rotary valve plate.

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

5. A main valve for 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 inlet ports P and P1 and the oil return port T are disconnected from the working ports A1, A2, B1, and B2, and the feed cylinder is stationary. When the valve is in the lower position, the oil inlet ports P and P1 are connected to the working ports A1 and A2, and the working ports B1 and B2 are connected to the oil return port T, and the feed cylinder is in a rapid advancing state. 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, and the feed cylinder is in a rapid retracting state.

6. A main valve for a directional drilling rig according to claim 3, characterized in that: When the three-position seven-way valve is in the neutral position, its P port is closed, and the return port T is connected to the working ports A3 and B3. At this time, the motor is stationary and does not rotate. 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 return port T. At this time, the motor is rotating in the forward direction. 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 return port T. At this time, the motor is rotating in the reverse direction.

7. A main valve for a directional drilling rig according to claim 1, characterized in that: The travel valve consists of two valve plates, namely the first travel valve plate and the second travel valve plate. The first travel valve plate has working ports A4 and B4, and the second travel valve plate has working ports A5 and B5. The two travel valve plates form hydraulically controlled second three-position six-way valves through internal valve stems. The switching of the valve plates is controlled by external pilot valves connected to the control ports a4, b4 and a5, b5 on the two travel valve plates. Pressure compensation valves are provided in the two travel valve plates respectively. The two second three-position six-way valves are connected between the oil inlet ports P and P1 and the working ports A4 and B4 and A5 and B5 respectively through corresponding pressure compensation valves.

8. A main valve for 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 closed, and the return port T is connected to the working ports A4, B4 or A5, B5. At this time, the travel motor is stationary and does not rotate. When the valve is in the lower position, the oil inlet ports P and P1 are connected to the working ports A4 or A5, and the return port T is connected to the working ports B4 or B5. At this time, the travel motor rotates forward. When the valve is in the upper position, the oil inlet ports P and P1 are connected to the working ports B4 or B5, and the return port T is connected to the working ports A4 or A5. At this time, the travel motor rotates in reverse.

9. A main valve for a directional drilling rig according to any one of claims 1-8, characterized in that: The control port at one end of each pressure compensation valve is connected to the LS port of the corresponding three-position six-way valve or three-position seven-way valve, and is connected to the feedback port LS on the oil inlet propulsion valve through the shuttle valve and feedback oil passage in the corresponding valve plate. The other oil inlet end of each shuttle valve is connected to the oil outlet end of the shuttle valve in the adjacent valve plate through the feedback oil passage, which is used to select the valve plate pressure with the largest oil inlet pressure to feed back to the variable pump.

Images