Drilling control valve of underground coal mine directional drilling machine

Abstract

The utility model discloses a drilling control valve of an underground coal mine directional drilling machine. Comprising a first pressure reducing valve, a second pressure reducing valve, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, a fifth reversing valve, a first main input port, a first main output port, a first main working oil port, a second main working oil port, a third main working oil port, a fourth main working oil port, a fifth main working oil port, a sixth main working oil port and a seventh main working oil port. An eighth main working oil port; and a ninth main working oil port. According to the control valve and the control method, when the drill rod of the directional drilling machine is disassembled and assembled, the working states of the rotary motor and the feeding and pulling oil cylinder are automatically selected according to different working conditions, the control valve and the control method integrate all control functions needed by related execution elements during normal drilling and drill rod disassembling and assembling, the drilling machine is easy to operate, drilling machine accidents caused by misoperation can be avoided, and the working efficiency is improved. The labor intensity is low; the drilling machine hydraulic system is high in integration degree and easy to install and maintain.

Description

Technical Field

[0001] The utility model relates to the field of drilling machinery, in particular to a drilling control valve for a directional drilling rig in an underground coal mine. Background Art

[0002] my country is rich in coal resources and mainly mines coal in underground mining. Coal mine gas and water hazards are the main sources of disasters in underground operations. Drilling underground is an effective means to remove gas and prevent water hazards. At present, directional drilling construction technology is widely used in underground coal mines for drilling. This technology can accurately orient the bottom of the hole, measure the drilling trajectory in real time, and adjust the drilling trajectory in real time. The directional drilling rig is the most critical equipment in the implementation of directional drilling construction technology. The process of disassembling and assembling the drill rod of the drilling rig involves the mutual coordination between the rotary motor and the feed and pull-out cylinder. The operator needs to operate multiple hydraulic valves at the same time to control the rotation of the rotary motor and the extension and retraction of the feed and pull-out cylinder. If the driller is not skilled in the operation, it will directly affect the speed of disassembling and assembling the drill rod and reduce the working efficiency of the drilling rig; if the operation is wrong, the drilling tool will be damaged. The directional drilling rig needs to control the rotary motor and the feed and pull-out cylinders to work in different states during normal drilling and disassembly of drill pipes. For example, the rotary motor has two states, high speed and low speed, during normal drilling conditions. When disassembling the drill pipe, the rotary motor is required to rotate at a lower speed; the feed and pull-out cylinders have two states, low speed feed and fast feed. When disassembling the drill pipe, the feed and pull-out cylinders are required to extend and retract at a lower speed. In order to achieve the above functions, the hydraulic system needs to be equipped with multiple valve groups. The system is complex, has low integration, occupies a large space, has high operation complexity, and is difficult to install and maintain.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to a person skilled in the art. Utility Model Content

[0004] The utility model aims to provide a drilling control valve for a directional drilling rig in an underground coal mine, so that the directional drilling rig can automatically select the working state of a rotary motor and a feed and pull cylinder according to different working conditions when disassembling a drill rod. The control valve and method integrate all the control functions required by relevant actuators during normal drilling and disassembling of the drill rod. The drilling rig is easy to operate, and drilling accidents caused by misoperation can be avoided, with low labor intensity. The drilling rig hydraulic system has a high degree of integration and is easy to install and maintain.

[0005] In order to achieve the above purpose, the technical solution provided by a specific embodiment of the utility model is as follows:

[0006] A drilling control valve for a directional drilling rig in a coal mine, comprising a first pressure reducing valve, a second pressure reducing valve, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, a fifth reversing valve, a first main input port, a first main output port, a first main working oil port, a second main working oil port, a third main working oil port, a fourth main working oil port, a fifth main working oil port, a sixth main working oil port, a seventh main working oil port, an eighth main working oil port, and a ninth main working oil port; the drilling control valve for a directional drilling rig in a coal mine also comprises a fourth pressure reducing valve, a first hydraulically controlled reversing valve, a first shuttle valve, a sixth pressure reducing valve, a second hydraulically controlled reversing valve, a first check valve, a second check valve, a third hydraulically controlled reversing valve, and a first throttle valve;

[0007] The first shuttle valve includes a first input port, a second input port and an output port, the sixth pressure reducing valve, the fourth pressure reducing valve, the first check valve, the second check valve, the first throttle valve, the second check valve and the first throttle valve all include an output port and an input port, the first hydraulically controlled reversing valve, the second hydraulically controlled reversing valve and the third hydraulically controlled reversing valve all include a first input port, a first output port, a second input port and a first hydraulically controlled port, the third hydraulically controlled reversing valve also includes a second hydraulically controlled port, the third reversing valve, the fourth reversing valve and the fifth reversing valve all include a first working oil port, a second working oil port, a first output port and a first input port;

[0008] The first working oil port of the third reversing valve is communicated with the first input port of the first shuttle valve; the second working oil port of the third reversing valve is communicated with the input port of the sixth pressure reducing valve; the first output port of the third reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, and the output port of the sixth pressure reducing valve is communicated with the second input port of the first shuttle valve; the output port of the first shuttle valve is communicated with the first input port of the first hydraulically controlled reversing valve, and the first working oil port of the fourth reversing valve is communicated with the first hydraulically controlled port of the first hydraulically controlled reversing valve and the input port of the first non-return valve respectively; the second working oil port of the fourth reversing valve is communicated with the first hydraulically controlled port of the second hydraulically controlled reversing valve and the input port of the second non-return valve respectively; the first output port of the fourth reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine;

[0009] The output port of the fourth pressure reducing valve is respectively connected to the second input port of the first hydraulically controlled reversing valve and the second input port of the second hydraulically controlled valve; the first input port of the second hydraulically controlled reversing valve is connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine, and the first working oil port of the fifth reversing valve is respectively connected to the output port of the first one-way valve, the first input port of the third hydraulically controlled reversing valve and the eighth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port of the fifth reversing valve is respectively connected to the output port of the second one-way valve, and the second input port of the third hydraulically controlled reversing valve is connected to the ninth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; The first output port of the reversing valve is communicated with the first main output port of the drilling control valve of the underground coal mine directional drilling rig, the first input port of the third hydraulically controlled reversing valve is communicated with its first hydraulic control port, and the second input port of the third hydraulically controlled reversing valve is communicated with its second hydraulic control port; the first output port of the third hydraulically controlled reversing valve is communicated with the input port of the first throttle valve; the output port of the first throttle valve is communicated with the first main output port of the drilling control valve of the underground coal mine directional drilling rig, and the first output port of the first hydraulically controlled reversing valve is communicated with the sixth main working oil port of the drilling control valve of the underground coal mine directional drilling rig; the first output port of the second hydraulically controlled reversing valve is communicated with the seventh main working oil port of the drilling control valve of the underground coal mine directional drilling rig.

[0010] In one or more embodiments of the present utility model, the first hydraulically controlled reversing valve further includes a first reversing position and a second reversing position; when the first hydraulically controlled reversing valve is in the first reversing position, the first input port of the first hydraulically controlled reversing valve is connected to the first output port, and the second input port of the first hydraulically controlled reversing valve is closed; when the first hydraulically controlled reversing valve is in the second reversing position, the second input port of the first hydraulically controlled reversing valve is connected to the first output port, and the first input port of the first hydraulically controlled reversing valve is closed;

[0011] The second hydraulically controlled reversing valve further includes a first reversing position and a second reversing position; when the second hydraulically controlled reversing valve is in the first reversing position, the first input port and the first output port of the second hydraulically controlled reversing valve are connected, and the second input port of the second hydraulically controlled reversing valve is closed; when the second hydraulically controlled reversing valve is in the second reversing position, the second input port and the first output port of the second hydraulically controlled reversing valve are connected, and the first input port of the second hydraulically controlled reversing valve is closed;

[0012] The third hydraulically controlled reversing valve includes a first reversing position, a second reversing position and a third reversing position; when the third hydraulically controlled reversing valve is in the first reversing position, the first input port of the third hydraulically controlled reversing valve is closed, and the first output port of the third hydraulically controlled reversing valve is connected to the second input port; when the third hydraulically controlled reversing valve is in the second reversing position, the second input port of the third hydraulically controlled reversing valve is closed, and the first output port of the third hydraulically controlled reversing valve is connected to the first input port; when the third hydraulically controlled reversing valve is in the third reversing position, the first input port, the first output port and the second input port of the third hydraulically controlled reversing valve are all closed.

[0013] In one or more embodiments of the present utility model, the third reversing valve includes:

[0014] A first reversing position, when the third reversing valve is in the first reversing position, the first input port of the third reversing valve is connected to the second working oil port, and the first working oil port of the third reversing valve is connected to the first output port;

[0015] The second reversing position, when the third reversing valve is in the second reversing position, the first input port of the third reversing valve is connected to the first working oil port, and the second working oil port of the third reversing valve is connected to the first output port;

[0016] The third reversing position, when the third reversing valve is in the third reversing position, the first input port of the third reversing valve is closed, and the first working oil port and the second working oil port of the third reversing valve are both connected to the first output port.

[0017] In one or more embodiments of the present utility model, the fourth reversing valve includes:

[0018] The first reversing position, when the fourth reversing valve is in the first reversing position, the first input port of the fourth reversing valve is connected to the second working oil port, and the first working oil port of the fourth reversing valve is connected to the first output port;

[0019] The second reversing position, when the fourth reversing valve is in the second reversing position, the first input port of the fourth reversing valve is connected to the first working oil port, and the second working oil port of the fourth reversing valve is connected to the first output port;

[0020] The third reversing position, when the fourth reversing valve is in the third reversing position, the first input port of the fourth reversing valve is closed, and the first working oil port and the second working oil port of the fourth reversing valve are both connected to the first output port.

[0021] In one or more embodiments of the present utility model, the fifth reversing valve includes:

[0022] The first reversing position, when the fifth reversing valve is in the first reversing position, the first input port of the fifth reversing valve is connected to the second working oil port, and the first working oil port of the fifth reversing valve is connected to the first output port;

[0023] The second reversing position, when the fifth reversing valve is in the second reversing position, the first input port of the fifth reversing valve is connected to the first working oil port, and the second working oil port of the fifth reversing valve is connected to the first output port;

[0024] The third reversing position: when the fifth reversing valve is in the third reversing position, the first input port, the first output port, the first working oil port, and the second working oil port of the fifth reversing valve are all closed.

[0025] In one or more embodiments of the present utility model, the first pressure reducing valve and the second pressure reducing valve both include an input port and an output port, and the first reversing valve and the second reversing valve both include a first working oil port, a second working oil port, a first output port and a first input port;

[0026] The input port of the first pressure reducing valve is communicated with the input port of the second pressure reducing valve and the first main input port of the drilling control valve of the directional drilling rig in the coal mine respectively; the output port of the first pressure reducing valve is communicated with the first main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the second pressure reducing valve is communicated with the first input port of the first reversing valve and the first input port of the second reversing valve respectively; the first output port of the first reversing valve and the first output port of the second reversing valve are both communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine; the first working oil port of the first reversing valve is communicated with the second main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port of the first reversing valve is communicated with the third main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first working oil port of the second reversing valve is communicated with the fourth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port of the second reversing valve is communicated with the fifth main working oil port of the drilling control valve of the directional drilling rig in the coal mine.

[0027] In one or more embodiments of the present utility model, the first reversing valve further includes:

[0028] A first reversing position, when the first reversing valve is in the first reversing position, the first input port of the first reversing valve is connected to the second working oil port, and the first working oil port of the first reversing valve is connected to the first output port;

[0029] a second reversing position, when the first reversing valve is in the second reversing position, the first input port of the first reversing valve is connected to the first working oil port, and the second working oil port of the first reversing valve is connected to the first output port;

[0030] The third reversing position: when the first reversing valve is in the third reversing position, the first input port of the first reversing valve is closed, and the first working oil port and the second working oil port of the first reversing valve are both connected to the first output port.

[0031] In one or more embodiments of the present utility model, the second reversing valve includes:

[0032] A first reversing position, when the second reversing valve is in the first reversing position, the first input port of the second reversing valve is connected to the second working oil port, and the first working oil port of the second reversing valve is connected to the first output port;

[0033] A second reversing position, when the second reversing valve is in the second reversing position, the first input port of the second reversing valve is connected to the first working oil port, and the second working oil port of the second reversing valve is connected to the first output port;

[0034] The third switching position: when the second switching valve is in the third switching position, the first input port of the second switching valve is closed, and the first working oil port and the second working oil port of the second switching valve are both connected to the first output port.

[0035] In one or more embodiments of the utility model, the drilling control valve of the underground coal mine directional drilling rig also includes a third pressure reducing valve, and the third pressure reducing valve includes an input port and an output port. The input port of the third pressure reducing valve is connected to the first main input port of the drilling control valve of the underground coal mine directional drilling rig, and the output port of the third pressure reducing valve is connected to the first input port of the third reversing valve.

[0036] In one or more embodiments of the utility model, the drilling control valve of the underground directional drilling rig in a coal mine also includes a fifth pressure reducing valve and a first speed regulating valve, and the fifth pressure reducing valve and the first speed regulating valve both include an input port and an output port, the input port of the fifth pressure reducing valve is connected to the first main input port of the drilling control valve of the underground directional drilling rig in the coal mine; the output port of the fifth pressure reducing valve is connected to the input port of the first speed regulating valve; the output port of the first speed regulating valve is connected to the first input port of the fourth reversing valve.

[0037] In one or more embodiments of the utility model, the drilling control valve of the underground directional drilling rig in a coal mine also includes a seventh pressure reducing valve and a second speed regulating valve, and the seventh pressure reducing valve and the second speed regulating valve both include an input port and an output port, the input port of the seventh pressure reducing valve is connected to the first main input port of the drilling control valve of the underground directional drilling rig in the coal mine, the output port of the seventh pressure reducing valve is connected to the input port of the second speed regulating valve, and the output port of the second speed regulating valve is connected to the first input port of the fifth reversing valve.

[0038] In one or more embodiments of the utility model, the coal mine underground directional drilling rig drilling control valve also includes an eighth pressure reducing valve, a seventh reversing valve, an eleventh main working oil port and a twelfth main working oil port, the eighth pressure reducing valve includes an input port and an output port, the seventh reversing valve includes a first working oil port, a second working oil port, a first input port and a first output port, the input port of the eighth pressure reducing valve is connected to the first main input port of the coal mine underground directional drilling rig drilling control valve; the output port of the eighth pressure reducing valve is connected to the first input port of the seventh reversing valve; the first working oil port of the eighth reversing valve is connected to the eleventh main working oil port of the coal mine underground directional drilling rig drilling control valve; the second working oil port of the eighth reversing valve is connected to the twelfth main working oil port of the coal mine underground directional drilling rig drilling control valve; the first output port of the eighth reversing valve is connected to the first main output port of the coal mine underground directional drilling rig drilling control valve.

[0039] In one or more embodiments of the present utility model, the seventh reversing valve includes:

[0040] The first reversing position, when the seventh reversing valve is in the first reversing position, the first input port of the seventh reversing valve is connected to the second working oil port, and the first working oil port of the seventh reversing valve is connected to the first output port;

[0041] The second reversing position, when the seventh reversing valve is in the second reversing position, the first input port of the seventh reversing valve is connected to the first working oil port, and the second working oil port of the seventh reversing valve is connected to the first output port;

[0042] The third reversing position, when the seventh reversing valve is in the third reversing position, the first input port of the seventh reversing valve is closed, and the first working oil port and the second working oil port of the seventh reversing valve are both connected to the first output port.

[0043] In one or more embodiments of the utility model, the drilling control valve of the coal mine underground directional drilling rig also includes a third pressure reducing valve, a sixth reversing valve, a feed and pull-out oil cylinder and a tenth main working oil port, the third pressure reducing valve includes an input port and an output port, the sixth reversing valve includes a first working oil port, a second working oil port, a first input port and a first output port, the feed and pull-out oil cylinder includes a main valve, a first input port and a second input port, the main valve includes a first hydraulic control port or a second hydraulic control port, and the rotary motor control valve includes a first hydraulic control port and a second hydraulic control port;

[0044] The input port of the third pressure reducing valve is connected to the first main input port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the third pressure reducing valve is connected to the first input port of the sixth reversing valve; the first working oil port of the sixth reversing valve is closed; the second working oil port of the sixth reversing valve is respectively connected to the first input port of the third reversing valve and the tenth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first output port of the sixth reversing valve is connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine.

[0045] In one or more embodiments of the present utility model, the sixth reversing valve includes:

[0046] The first reversing position, when the sixth reversing valve is in the first reversing position, the first input port of the sixth reversing valve is connected to the second working oil port, and the first working oil port of the sixth reversing valve is connected to the first output port;

[0047] The second reversing position, when the sixth reversing valve is in the second reversing position, the first input port of the sixth reversing valve is connected to the first working oil port, and the second working oil port of the sixth reversing valve is connected to the first output port;

[0048] The third switching position, when the sixth switching valve is in the third switching position, the first input port of the sixth switching valve is closed, and the first working oil port and the second working oil port of the sixth switching valve are both connected to the first output port.

[0049] A method for controlling the drilling of a directional drill in an underground coal mine comprises the following steps:

[0050] S1. When the drill pipe is removed, the rotary motor is controlled to rotate in the reverse direction at a low speed, and the fourth reversing valve is operated to be in the first reversing position. The pressure oil flows out from the second working oil port of the fourth reversing valve and pushes the second hydraulically controlled reversing valve to switch to the second reversing position. The pressure oil after being reduced pressure by the fourth pressure reducing valve passes through the second hydraulically controlled reversing valve and reaches the second hydraulically controlled port of the rotary motor control valve, thereby controlling the rotary motor to rotate in the reverse direction at a low speed.

[0051] S2, when the drill pipe is removed, the feed and pull-out oil cylinder is slowly pulled out, and at the same time, the pressure oil flows out from the second working oil port of the fourth reversing valve and reaches the second hydraulic control port of the third hydraulic control reversing valve, thereby pushing the third hydraulic control reversing valve to the second reversing position, and the pressure oil flows out from the second working oil port of the fourth reversing valve and reaches the second input port of the feed and pull-out oil cylinder, thereby realizing the slow pulling of the feed and pull-out oil cylinder;

[0052] S3, when the drill pipe is installed, the rotary motor is controlled to rotate forward at a low speed, and the fourth reversing valve is operated to be in the second reversing position. The pressure oil flows out through the first working oil port of the fourth reversing valve and pushes the first hydraulic control reversing valve to switch to the second reversing position. The pressure oil after being reduced pressure by the fourth pressure reducing valve passes through the first hydraulic control reversing valve and reaches the first hydraulic control port of the rotary motor control valve, thereby controlling the rotary motor to rotate forward at a low speed;

[0053] S4, when the drill pipe is installed, the feed and pull-out oil cylinder is fed slowly, and the pressure oil flows out from the first working oil port of the fourth reversing valve and reaches the first hydraulic control port of the third hydraulic control reversing valve, thereby pushing the third hydraulic control reversing valve to the first reversing position, and the pressure oil flows out from the first working oil port of the fourth reversing valve and reaches the first input port of the feed and pull-out oil cylinder, thereby realizing the slow feeding of the feed and pull-out oil cylinder;

[0054] S5, when the drilling rig is in the drilling condition, the rotary motor rotates forward at high speed, the third reversing valve is operated to be in the second reversing position, the pressure oil flows out from the first working oil port of the third reversing valve, the pressure oil passes through the first shuttle valve and the first hydraulic control reversing valve to reach the first hydraulic control port of the rotary motor control valve, and the pressure oil drives the rotary motor control valve to reversing normally, thereby realizing the high-speed forward rotation of the rotary motor;

[0055] S6. When the drilling rig is in drilling condition, the feed and pull-out oil cylinder feeds in or pulls out quickly, and the seventh reversing valve is operated to be in the first reversing position or the second reversing position. The pressure oil enters the first hydraulic control port or the second hydraulic control port of the feed and pull-out oil cylinder main valve through the seventh reversing valve, pushing the feed and pull-out oil cylinder main valve to reverse, thereby realizing the feed and pull-out oil cylinder to feed in or pull out quickly.

[0056] In one or more embodiments of the present invention, when the rotation speed of the rotary motor is controlled in the above and steps, the drill rod disassembly and assembly action is controlled, and the output pressure of the fourth pressure reducing valve is adjusted to control the rotation speed of the rotary motor;

[0057] When the working pressure and speed of the feed and pull-out cylinder are controlled in the steps, the drill rod disassembly and assembly action is controlled, and the output pressure of the fifth pressure reducing valve and the flow rate of the first speed regulating valve are adjusted to control the working pressure and speed of the feed and pull-out cylinder.

[0058] In one or more embodiments of the present invention, in the steps, the fifth reversing valve is operated to be in the first reversing position, and the hydraulic oil flows out through the second working oil port of the fifth reversing valve and reaches the second input port of the feed and pull cylinder, thereby realizing the slow pulling of the feed and pull cylinder;

[0059] In the step, the fifth reversing valve is operated to be in the second reversing position, and the hydraulic oil flows out through the first working oil port of the fifth reversing valve and reaches the first input port of the feed and pull-out oil cylinder, thereby realizing the slow feeding of the feed and pull-out oil cylinder; by adjusting the output pressure of the seventh pressure reducing valve and the flow rate of the second speed regulating valve, the pressure and speed of the feed and pull-out oil cylinder when working slowly can be controlled.

[0060] In one or more embodiments of the present utility model, in the steps, the third reversing valve is operated to be in the first reversing position, the pressure oil flows out from the second working oil port of the third reversing valve, is reduced in pressure by the sixth pressure reducing valve, and then passes through the first shuttle valve and the first hydraulically controlled reversing valve to reach the first hydraulic control port of the rotary motor control valve, and the pressure oil pushes the rotary motor control valve to slightly reverse, thereby realizing low-speed forward rotation of the rotary motor.

[0061] In one or more embodiments of the utility model, the first reversing valve is manipulated to be in the first reversing position or the second reversing position to achieve opening or closing of the clamp, and the second reversing valve is manipulated to be in the first reversing position or the second reversing position to achieve opening or closing of the chuck, and the output pressure of the second pressure reducing valve is adjusted to control the opening and closing pressure of the clamp, and the output pressure of the second pressure reducing valve is adjusted to control the closing pressure of the chuck.

[0062] In one or more embodiments of the present invention, the following steps are also included:

[0063] S21, opening the brake; by operating the sixth reversing valve to be in the first reversing position, the pressure oil flows out through the second working oil port of the sixth reversing valve and reaches the brake control oil port, thereby opening the brake;

[0064] S22, closing the brake; operating the sixth reversing valve to place it in the third reversing position, and the pressure oil returns through the first output port of the sixth reversing valve, thereby closing the brake.

[0065] In one or more embodiments of the present invention, when the brake is closed in the step, the sixth reversing valve must be operated to be in the first reversing position before the third reversing valve can be operated to realize the forward rotation of the rotary motor.

[0066] Compared with the prior art, the utility model has the following benefits:

[0067] 1. The control valve and method realize the linkage between the rotary motor and the feed cylinder when disassembling the drill pipe, and can automatically select the working state of the rotary motor and the feed and pull-out cylinder according to the actual working conditions. At the same time, the movement speed of the rotary motor and the feed and pull-out cylinder can also be adjusted, which can effectively avoid misoperation and improve the speed of disassembling the drill pipe.

[0068] 2. The control valve and method realize all control functions of related actuators during drilling operation of the drilling rig, such as opening and closing of the clamp, opening and closing of the chuck, opening and closing of the brake, high-speed and low-speed rotation of the rotary motor, linkage between the rotary motor and the feed and pull-out cylinder when disassembling the drill pipe, and low-speed and high-speed feeding of the feed and pull-out cylinder. The drilling rig hydraulic system has high integration and simple installation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0070] Figure 1 This is a schematic diagram of the hydraulic principle of the embodiment of the utility model when the system has no brakes;

[0071] Figure 2 This is a schematic diagram of the hydraulic principle of the embodiment of the utility model when the system has a brake; Description of the main figure numerals:

[0072] 1—first pressure reducing valve; 2—second pressure reducing valve; 3—first reversing valve; 4—second reversing valve; 5—third reversing valve; 6—third pressure reducing valve; 7—fourth pressure reducing valve; 8—first hydraulically controlled reversing valve; 9—fifth pressure reducing valve; 10—first shuttle valve; 11—sixth pressure reducing valve; 12—first speed regulating valve; 13—fourth reversing valve; 14—fifth reversing valve; 15—second hydraulically controlled reversing valve; 16—seventh pressure reducing valve; 17—first non-return valve; 18—second non-return valve; 19—second speed regulating valve; 20—first throttle valve; 21—third hydraulically controlled reversing valve; 22—hydraulic oil source; 23—clamp; 24—chuck; 25—swing motor control valve; 26—swing motor; 27—feed and pull cylinder; 28—sixth reversing valve; 29—brake ;31—main valve of the feed and pull-out cylinder;32—eighth pressure reducing valve;33—seventh reversing valve;P—first main input port;T—first main output port;B—first main working oil port;JK—second main working oil port;JG—third main working oil port;KP—fourth main working oil port;KP'—fifth main working oil port;ZD—tenth main working oil port;ZH—sixth main working oil port;FH—seventh main working oil port;GJ—eighth main working oil port;QB—ninth main working oil port;KGJ—eleventh main working oil port;KQB—twelfth main working oil port;a3-first reversing position;b3-second reversing position;c3-third reversing position;3a-first working oil port;3b-second working oil port;3p-first input port;3t-first output port; a4-first reversing position; b4-second reversing position; c4-third reversing position; 4a-first working oil port; 4b-second working oil port; 4p-first input port; 4t-first output port; a28-first reversing position; b28-second reversing position; c28-third reversing position; 28a first working oil port; 28b-second working oil port; 28p-first input port; 28t-first output port; a5-first reversing position; b5-second reversing position; c5-third reversing position; 5a-first working oil port; 5b-second working oil port; 5p-first input port; 5t-first output port; a13-first reversing position; b13-second reversing position; c13-third reversing position; 13a-first working oil port; 13b-second working working oil port; 13p-first input port; 13t-first output port; a14-first reversing position; b14-second reversing position; c14-third reversing position; 14a-first working oil port; 14b-second working oil port; 14p-first input port; 14t-first output port; a33-first reversing position; b33-second reversing position; c33-third reversing position; 33a-first working oil port; 33b-second working oil port; 33p-first input port; 33t-first output port; a8-first reversing position; 8x-first hydraulic control port; b8-second reversing position; 8a-first input port; 8b-second input port; 8c-first output port; 10a-first input port; 10b-second input port; 10c-output port;a15-first reversing position; 15x-first hydraulic control port; 15a-first input port; 15b-second input port; 15c-first output port; b15-second reversing position; a21-first reversing position; 21a-first input port; 21b-second input port; 21c-first output port; c21-third reversing position; b21-second reversing position; 21X1-first hydraulic control port; 21X2-second hydraulic control port; 31X1-first hydraulic control port; 31X2-second hydraulic control port; 25X1-first hydraulic control port; 25X2-second hydraulic control port; DETAILED DESCRIPTION

[0073] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0074] Example 1

[0075] like Figure 1 As shown, the first shuttle valve 10 includes a first input port, a second input port and an output port, the sixth pressure reducing valve 11 and the fourth pressure reducing valve 7 both include an output port and an input port, the first check valve 17, the second check valve 18, and the first throttle valve 20 both include an input port and an output port, and the second check valve 18 and the first throttle valve 20 both include an input port and an output port.

[0076] The first hydraulically controlled reversing valve 8, the second hydraulically controlled reversing valve 15 and the third hydraulically controlled reversing valve 21 all include a first input port, a first output port, a second input port, a first hydraulically controlled port 21X1 and a second hydraulically controlled port 21X2. Specifically, the first hydraulically controlled reversing valve 8 includes a first input port 8a, a second input port 8b, a first output port 8c and a first hydraulically controlled port. The first shuttle valve 10 includes a first input port 10a, a second input port 10b and an output port 10c. The second hydraulically controlled reversing valve 15 includes a first reversing position a15, a first hydraulically controlled port 15x, a first input port 15a, a second input port 15b, a first output port 15c and a second reversing position b15. The third hydraulically controlled reversing valve 21 includes a second reversing position b21, a first hydraulically controlled port 21X1 and a second hydraulically controlled port 21X2.

[0077] The first reversing valve 3 includes a first working oil port 3a, a second working oil port 3b, a first input port 3p, a first output port 3t, a first reversing position a3, a second reversing position b3 and a third reversing position c3; the second reversing valve 4 includes a first reversing position a4, a second reversing position b4, a third reversing position c4, a first working oil port 4a, a second working oil port 4b, a first input port 4p and a first output port 4t. The third reversing valve 5 includes a first working oil port 5a, a second working oil port 5b, a first input port 5p, a first output port 5t, a first reversing position a5, a second reversing position b5 and a third reversing position c5;

[0078] The fourth reversing valve 13 includes a first working oil port 13a, a second working oil port 13b, a first input port 13p, a first output port 13t, a first reversing position a13, a second reversing position b13 and a third reversing position c13; the fifth reversing valve 14 includes a first working oil port 14a, a second working oil port 14b, a first input port 14p, a first output port 14t, a first reversing position a14, a second reversing position b14 and a third reversing position c14; the sixth reversing valve 28 includes a first working oil port 28a, the second working oil port 28b, the first input port 28p, the first output port 28t, the first switching position a28, the second switching position b28 and the third switching position c28; the seventh reversing valve 33 includes the first working oil port 33a, the second working oil port 33b, the first input port 33p, the first output port 33t, the first switching position a33, the second switching position b33 and the third switching position c33; the main valve 31 of the feed and pull cylinder includes the first hydraulic control port 31X1 and the second hydraulic control port 31X2.

[0079] A drilling control valve for a directional drilling rig in a coal mine, comprising a first pressure reducing valve 1, a second pressure reducing valve 2, a first reversing valve 3, a second reversing valve 4, a third reversing valve 5, a fourth reversing valve 13, a fifth reversing valve 14, a first main input port, a first main output port, a first main working oil port, a second main working oil port, a third main working oil port, a fourth main working oil port, a fifth main working oil port, a sixth main working oil port, a seventh main working oil port, an eighth main working oil port, and a ninth main working oil port; a drilling control valve for a directional drilling rig in a coal mine also comprises a fourth pressure reducing valve 7, a first hydraulically controlled reversing valve 8, a first shuttle valve 10, a sixth pressure reducing valve 11, a second hydraulically controlled reversing valve 15, a first check valve 17, a second check valve 18, a third hydraulically controlled reversing valve 21, and a first throttle valve 20;

[0080] The sixth pressure reducing valve 11, the fourth pressure reducing valve 7, the first one-way valve 17, the second one-way valve 18, the first throttle valve 20, the second one-way valve 18 and the first throttle valve 20 all include an output port and an input port;

[0081] The first working oil port 5a of the third reversing valve 5 is communicated with the first input port 10a of the first shuttle valve 10; the second working oil port 5b of the third reversing valve 5 is communicated with the input port of the sixth pressure reducing valve 11; the first output port 5t of the third reversing valve 5 is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, and the output port 10c of the sixth pressure reducing valve 11 is communicated with the second input port 10b of the first shuttle valve 10; the output port 10c of the first shuttle valve 10 is communicated with the first input port 8a of the first hydraulically controlled reversing valve 8, and the first working oil port 13a of the fourth reversing valve 13 is respectively communicated with the first hydraulically controlled port of the first hydraulically controlled reversing valve 8 and the input port of the first non-return valve 17; the second working oil port 13b of the fourth reversing valve 13 is respectively communicated with the first hydraulically controlled port of the second hydraulically controlled reversing valve 15 and the input port of the second non-return valve 18; the first output port 13 of the fourth reversing valve 13 is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine;

[0082] The output port of the fourth pressure reducing valve 7 is respectively communicated with the second input port 8b of the first hydraulically controlled reversing valve 8 and the second input port 5b of the second hydraulically controlled reversing valve 15; the first input port 5a of the second hydraulically controlled reversing valve 15 is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, and the first working oil port 14a of the fifth reversing valve 14 is respectively communicated with the output port of the first check valve 17, the first input port of the third hydraulically controlled reversing valve 21 and the eighth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port 14b of the fifth reversing valve 14 is respectively communicated with the output port of the second check valve 18, and the second input port of the third hydraulically controlled reversing valve 21 is communicated with the ninth main working oil port of the drilling control valve of the directional drilling rig in the coal mine;

[0083] The first output port 14t of the fifth reversing valve 14 is connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine, the first input port of the third hydraulically controlled reversing valve 21 is connected to its first hydraulically controlled port 21X1, and the second input port 21b of the third hydraulically controlled reversing valve 21 is connected to its second hydraulically controlled port 21X2; the first output port 21c of the third hydraulically controlled reversing valve 21 is connected to the input port of the first throttle valve 20; the output port of the first throttle valve 20 is connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine, the first output port 8a of the first hydraulically controlled reversing valve 8 is connected to the sixth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first output port 15c of the second hydraulically controlled reversing valve 15 is connected to the seventh main working oil port of the drilling control valve of the directional drilling rig in the coal mine.

[0084] The first hydraulically controlled reversing valve 8 also includes a first reversing position a8 and a second reversing position b8; when the first hydraulically controlled reversing valve 8 is in the first reversing position a8, the first input port 8a of the first hydraulically controlled reversing valve 8 is connected to the first output port 8c, and the second input port 8b of the first hydraulically controlled reversing valve 8 is closed; when the first hydraulically controlled reversing valve 8 is in the second reversing position b8, the second input port 8b of the first hydraulically controlled reversing valve 8 is connected to the first output port 8a, and the first input port 8a of the first hydraulically controlled reversing valve 8 is closed;

[0085] The second hydraulically controlled reversing valve 15 further includes a first reversing position a15 and a second reversing position b15; when the second hydraulically controlled reversing valve 15 is in the first reversing position a15, the first input port 15a of the second hydraulically controlled reversing valve 15 is connected to the first output port 15c, and the second input port 15b of the second hydraulically controlled reversing valve 15 is closed; when the second hydraulically controlled reversing valve 15 is in the second reversing position b15, the second input port 15b of the second hydraulically controlled reversing valve 15 is connected to the first output port 15c, and the first input port 15a of the second hydraulically controlled reversing valve 15 is closed;

[0086] The third hydraulically controlled reversing valve 21 includes a first reversing position a21, a second reversing position b21 and a third reversing position; when the third hydraulically controlled reversing valve 21 is in the first reversing position a21, the first input port 21a of the third hydraulically controlled reversing valve 21 is closed, and the first output port 21c of the third hydraulically controlled reversing valve 21 is connected to the second input port 21b; when the third hydraulically controlled reversing valve 21 is in the second reversing position b21, the second input port 21b of the third hydraulically controlled reversing valve 21 is closed, and the first output port 21c of the third hydraulically controlled reversing valve 21 is connected to the first input port 21a; when the third hydraulically controlled reversing valve 21 is in the third reversing position, the first input port 21a, the first output port 21c and the second input port 21b of the third hydraulically controlled reversing valve 21 are all closed.

[0087] The third reversing valve 5 includes a first reversing position a5, a second reversing position b5 and a third reversing position c5. When the third reversing valve 5 is in the first reversing position a5, the first input port 5p of the third reversing valve 5 is connected to the second working oil port 5b, and the first working oil port 5a of the third reversing valve 5 is connected to the first output port 5t; when the third reversing valve 5 is in the second reversing position b5, the first input port 5p of the third reversing valve 5 is connected to the first working oil port 5a, and the second working oil port 5b of the third reversing valve 5 is connected to the first output port 5t; when the third reversing valve 5 is in the third reversing position c5, the first input port 5p of the third reversing valve 5 is closed, and the first working oil port 5a and the second working oil port 5b of the third reversing valve 5 are both connected to the first output port 5t.

[0088] The fourth reversing valve 13 includes a first reversing position a13, a second reversing position b13 and a third reversing position c13. When the fourth reversing valve 13 is in the first reversing position a13, the first input port 13p of the fourth reversing valve 13 is communicated with the second working oil port 13b, and the first working oil port 13a of the fourth reversing valve 13 is communicated with the first output port 13t; when the fourth reversing valve 13 is in the second reversing position b13, the first input port 13p of the fourth reversing valve 13 is communicated with the first working oil port 13a, and the second working oil port 13b of the fourth reversing valve 13 is communicated with the first output port 13t; when the fourth reversing valve 13 is in the third reversing position c13, the first input port 13p of the fourth reversing valve 13 is closed, and the first working oil port 13a and the second working oil port 13b of the fourth reversing valve 13 are both communicated with the first output port 13t.

[0089] The fifth reversing valve 14 includes a first reversing position a1, a second reversing position b14 and a third reversing position c14. When the fifth reversing valve 14 is in the first reversing position a14, the first input port 14p of the fifth reversing valve 14 is connected to the second working oil port 14b, and the first working oil port 14a of the fifth reversing valve 14 is connected to the first output port 14t. When the fifth reversing valve 14 is in the second reversing position b14, the first input port 14p of the fifth reversing valve 14 is connected to the first working oil port 14a, and the second working oil port 14b of the fifth reversing valve 14 is connected to the first output port 14t; when the fifth reversing valve 14 is in the third reversing position c14, the first input port 14p, the first output port 14t, the first working oil port 14a and the second working oil port 14b of the fifth reversing valve 14 are all closed.

[0090] The first pressure reducing valve 1 and the second pressure reducing valve 2 both include an input port and an output port, and the first reversing valve 3 and the second reversing valve 4 both include a first working oil port, a second working oil port, a first output port and a first input port; the input port of the first pressure reducing valve 1 is respectively connected with the input port of the second pressure reducing valve 2 and the first main input port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the first pressure reducing valve 1 is connected with the first main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the second pressure reducing valve 2 is respectively connected with the first input port 3p of the first reversing valve 3 and the first input port 4p of the second reversing valve 4; the first The output port 3t and the first output port 4t of the second reversing valve 4 are both connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine; the first working oil port 3a of the first reversing valve 3 is connected to the second main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port 3b of the first reversing valve 3 is connected to the third main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first working oil port 4a of the second reversing valve 4 is connected to the fourth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port 4b of the second reversing valve 4 is connected to the fifth main working oil port of the drilling control valve of the directional drilling rig in the coal mine.

[0091] The first reversing valve 3 further includes a first reversing position a3, a second reversing position b3 and a third reversing position c3. When the first reversing valve 3 is in the first reversing position a3, the first input port 3p of the first reversing valve 3 is connected to the second working oil port 3b, and the first working oil port 3a of the first reversing valve 3 is connected to the first output port 3t; when the first reversing valve 3 is in the second reversing position b3, the first input port 3p of the first reversing valve 3 is connected to the first working oil port 3a, and the second working oil port 3b of the first reversing valve 3 is connected to the first output port 3t; when the first reversing valve 3 is in the third reversing position c3, the first input port 3p of the first reversing valve 3 is closed, and the first working oil port 3a and the second working oil port 3b of the first reversing valve 3 are both connected to the first output port 3t.

[0092] The second reversing valve 4 includes a first reversing position a4, a second reversing position b4 and a third reversing position c4. When the second reversing valve 4 is in the first reversing position a4, the first input port 4p of the second reversing valve 4 is connected to the second working oil port 4b, and the first working oil port 4a of the second reversing valve 4 is connected to the first output port 4t; when the second reversing valve 4 is in the second reversing position b4, the first input port 4p of the second reversing valve 4 is connected to the first working oil port 4a, and the second working oil port 4b of the second reversing valve 4 is connected to the first output port 4t; when the second reversing valve 4 is in the third reversing position c4, the first input port 4p of the second reversing valve 4 is closed, and the first working oil port 4a and the second working oil port 4b of the second reversing valve 4 are both connected to the first output port 4t.

[0093] The drilling control valve of the underground directional drilling rig in a coal mine also includes a third pressure reducing valve 6, which includes an input port and an output port. The input port of the third pressure reducing valve 6 is connected to the first main input port of the drilling control valve of the underground directional drilling rig in a coal mine, and the output port of the third pressure reducing valve 6 is connected to the first input port 5p of the third reversing valve 5.

[0094] The drilling control valve of the directional drilling rig in the coal mine also includes a fifth pressure reducing valve 9 and a first speed regulating valve 12. The fifth pressure reducing valve 9 and the first speed regulating valve 12 both include an input port and an output port. The input port of the fifth pressure reducing valve 9 is connected to the first main input port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the fifth pressure reducing valve 9 is connected to the input port of the first speed regulating valve 12; the output port of the first speed regulating valve 12 is connected to the first input port 13p of the fourth reversing valve 13.

[0095] The drilling control valve of the directional drilling rig in the coal mine also includes a seventh pressure reducing valve 16 and a second speed regulating valve 19. The seventh pressure reducing valve 16 and the second speed regulating valve 19 both include an input port and an output port. The input port of the seventh pressure reducing valve 16 is connected to the first main input port of the drilling control valve of the directional drilling rig in the coal mine, the output port of the seventh pressure reducing valve 16 is connected to the input port of the second speed regulating valve 19, and the output port of the second speed regulating valve 19 is connected to the first input port of the fifth reversing valve 14.

[0096] The drilling control valve of the directional drilling rig in the coal mine also includes an eighth pressure reducing valve 32, a seventh reversing valve 33, an eleventh main working oil port and a twelfth main working oil port. The eighth pressure reducing valve 32 includes an input port and an output port. The seventh reversing valve 33 includes a first working oil port 33a, a second working oil port 33b, a first input port 33p and a first output port 33t. The input port of the eighth pressure reducing valve 32 is connected to the first main input port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the eighth pressure reducing valve 32 is connected to the first input port 33p of the seventh reversing valve 33; the first working oil port of the eighth reversing valve is connected to the eleventh main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the second working oil port of the eighth reversing valve is connected to the twelfth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first output port of the eighth reversing valve is connected to the first main output port of the drilling control valve of the 33t underground directional drilling rig in the coal mine.

[0097] The seventh reversing valve 33 includes a first reversing position a33, a second reversing position b33 and a third reversing position c33. When the seventh reversing valve 33 is in the first reversing position a33, the first input port 33p of the seventh reversing valve 33 is communicated with the second working oil port 33b, and the first working oil port 33a of the seventh reversing valve 33 is communicated with the first output port 33t; when the seventh reversing valve 33 is in the second reversing position b33, the first input port 33p of the seventh reversing valve 33 is communicated with the first working oil port 33a, and the second working oil port 33b of the seventh reversing valve 33 is communicated with the first output port 33t; when the seventh reversing valve 33 is in the third reversing position c33, the first input port 33p of the seventh reversing valve 33 is closed, and the first working oil port 33a and the second working oil port 33b of the seventh reversing valve 33 are both communicated with the first output port 33t.

[0098] The drilling control valve of the directional drilling rig in the coal mine also includes a third pressure reducing valve 6, a sixth reversing valve 28, a feed and pull-in oil cylinder 27 and a tenth main working oil port. The third pressure reducing valve 6 includes an input port and an output port. The sixth reversing valve 28 includes a first working oil port 28a, a second working oil port 28b, a first input port 28p and a first output port 28t. The feed and pull-in oil cylinder 27 includes a main valve, a first input port and a second input port. The main valve includes a first hydraulic control port or a second hydraulic control port. The rotary motor control valve 25 includes a first hydraulic control port 25X1 and a second hydraulic control port 25X2.

[0099] The input port of the third pressure reducing valve 6 is connected to the first main input port of the drilling control valve of the directional drilling rig in the coal mine; the output port of the third pressure reducing valve 6 is connected to the first input port 28p of the sixth reversing valve 28; the first working oil port 28a of the sixth reversing valve 28 is closed; the second working oil port 28b of the sixth reversing valve 28 is respectively connected to the first input port 5p of the third reversing valve 5 and the tenth main working oil port of the drilling control valve of the directional drilling rig in the coal mine; the first output port 28t of the sixth reversing valve 28 is connected to the first main output port of the drilling control valve of the directional drilling rig in the coal mine.

[0100] The sixth reversing valve 28 includes a first reversing position a28, a second reversing position b28 and a third reversing position c28. When the sixth reversing valve 28 is in the first reversing position a28, the first input port 28p of the sixth reversing valve 28 is communicated with the second working oil port 28b, and the first working oil port 28a of the sixth reversing valve 28 is communicated with the first output port 28t; when the sixth reversing valve 28 is in the second reversing position b28, the first input port 28p of the sixth reversing valve 28 is communicated with the first working oil port 28a, and the second working oil port 28b of the sixth reversing valve 28 is communicated with the first output port 28t; when the sixth reversing valve 28 is in the third reversing position c28, the first input port 28p of the sixth reversing valve 28 is closed, and the first working oil port 28a and the second working oil port 28b of the sixth reversing valve 28 are both communicated with the first output port 28t.

[0101] like Figure 1 As shown, the first main output port T of the control valve is connected to the hydraulic oil tank, the pressure oil enters the control valve through the first main input port P, and the hydraulic oil reaches the first main working oil port B through the first pressure reducing valve 1, which can provide the pressure oil source required for other actions of the drilling rig; the pressure oil enters the first reversing valve 3 and the second reversing valve 4 after passing through the second pressure reducing valve 2. When the first reversing valve 3 is in the first reversing position a3, the pressure oil flows out from the second working oil port 3b of the first reversing valve 3 and reaches the closing control port of the clamp 23, thereby realizing the closing of the clamp 23.

[0102] When the first reversing valve 3 is in the second reversing position b3, the pressure oil flows out from the first working oil port 3a of the first reversing valve 3 and reaches the opening control port of the clamp 23, thereby realizing the opening of the clamp 23; when the first reversing valve 3 is in the third reversing position c3, the clamp 23 is depressurized. When the second reversing valve 4 is in the second reversing position b4, the pressure oil flows out from the first working oil port 4a of the second reversing valve 4 and reaches the control oil port of the chuck 24, thereby controlling the chuck 24 to be closed; when the second reversing valve 4 is in the third reversing position c4, the chuck 24 is depressurized, thereby controlling the chuck 24 to be opened; by adjusting the output pressure of the second pressure reducing valve 2, the oil pressure entering the clamp 23 and the chuck 24 can be controlled, thereby adapting to the clamps and chucks with different opening and closing parameters.

[0103] When the drilling rig is in the drilling condition, the fourth reversing valve 13 is operated to be in the third reversing position c13, and its first working oil port 13a and the second working oil port 13b are both connected to the hydraulic oil tank. There is no pressure oil in the hydraulic control ports of the first hydraulically controlled reversing valve 8 and the second hydraulically controlled reversing valve 15. Therefore, the first hydraulically controlled reversing valve 8 is in the first reversing position a8, and the second hydraulically controlled reversing valve 15 is in the first reversing position a15. The pressure oil enters the third reversing valve 5 after passing through the third pressure reducing valve 6. When the third reversing valve 5 is in the first reversing position a5, the pressure oil flows out from the second working oil port 5b of the third reversing valve 5 and finally reaches the first hydraulic control port 25X1 of the rotary motor control valve 25. The pressure of the pressure oil decreases after passing through the sixth pressure reducing valve 11, so it can only push the rotary motor control valve 25 to slightly reverse. At this time, the rotary motor 26 rotates forward at a low speed.

[0104] When the third reversing valve 5 is in the second reversing position b5, the pressure oil flows out from the first working oil port 5a of the third reversing valve 5 and finally reaches the first hydraulic control port 25X1 of the swing motor control valve 25. The pressure oil does not pass through the sixth pressure reducing valve 11, so the pressure is relatively high, so it can push the swing motor control valve 25 to reversing normally. At this time, the swing motor 26 rotates forward at high speed.

[0105] From the above analysis, it can be known that when the drilling rig is in drilling condition, the low-speed forward rotation and high-speed forward rotation of the rotary motor 26 can be achieved by operating the third reversing valve 5.

[0106] When the drilling rig is in the drilling state, the pressure oil enters the first input port 14p of the fifth reversing valve 14 through the seventh pressure reducing valve 16 and the second speed regulating valve 19. When the fifth reversing valve 14 is in the first reversing position a14, the second input port of the oil pulling cylinder 27 is supplied with oil and the first input port is returned with oil, so that the oil pulling cylinder 27 performs a slow pulling action.

[0107] When the fifth reversing valve 14 is in the second reversing position b14, oil is supplied from the first input port of the feed and pull-up oil cylinder 27 and oil is returned from the second input port, and the feed and pull-up oil cylinder 27 performs a slow feeding action; the pressure of the slow feeding and slow pulling can be controlled by adjusting the output pressure of the seventh reducing valve 16; the speed of the slow feeding and slow pulling can be controlled by adjusting the second speed regulating valve 19.

[0108] From the above analysis, it can be known that when the drilling rig is in drilling condition, the slow feeding and slow pulling action of the feeding and pulling cylinder 27 can be achieved by operating the fifth reversing valve 14.

[0109] When the drilling rig is in drilling operation, the pressure oil enters the first input port 33p of the seventh reversing valve 33 through the eighth pressure reducing valve 32. When the seventh reversing valve 33 is in the first reversing position a33, the pressure oil enters the second hydraulic control port 31X2 of the feed and pull-out cylinder main valve 31, pushing the feed and pull-out cylinder main valve 31 to reverse, thereby realizing the rapid pulling of the feed and pull-out cylinder 27.

[0110] When the seventh reversing valve 33 is in the second reversing position b33, the pressure oil enters the first hydraulic control port 31X1 of the feed and pull-in cylinder main valve 31, pushing the feed and pull-in cylinder main valve 31 to reverse, thereby realizing the rapid feeding of the feed and pull-in cylinder 27. By adjusting the output pressure of the eighth pressure reducing valve 32, the pressure of the hydraulic control port of the feed and pull-in cylinder main valve 31 can be controlled.

[0111] From the above analysis, it can be known that when the drilling rig is in drilling condition, the fast feeding and fast pulling action of the feeding and pulling cylinder 27 can be achieved by operating the seventh reversing valve 33.

[0112] When the drilling rig is disassembling and assembling the drill pipe, the third reversing valve 5, the fifth reversing valve 14 and the seventh reversing valve 33 are operated to make them all in the third reversing position; the pressure oil enters the first input port 13p of the fourth reversing valve 13 after passing through the fifth pressure reducing valve 9 and the first speed regulating valve 12, and the fourth reversing valve 13 is operated to make it in the first reversing position a13. At this time, the pressure oil flows out from the second working oil port 13b of the fourth reversing valve 13 and reaches the first hydraulic control port 15x of the second hydraulic control reversing valve 15, thereby pushing the second hydraulic control reversing valve 15 to switch to the second reversing position b15; at this time, the output port of the fourth pressure reducing valve 7 is connected with the second hydraulic control port 25X2 of the rotary motor control valve 25, and the pressure oil flows into the second hydraulic control port 25X2 of the rotary motor control valve 25 after passing through the fourth pressure reducing valve 7, thereby pushing the rotary motor control valve 25 to slightly reverse, so as to realize the reverse slow rotation of the rotary motor 26;

[0113] At the same time, the pressure oil flowing out from the second working oil port 13b of the fourth reversing valve 13 reaches the second hydraulic control port 21X2 of the third hydraulically controlled reversing valve 21, and pushes the third hydraulically controlled reversing valve 21 to be in the second reversing position b21. At this time, the first input port of the feed and pull-up oil cylinder 27 is connected to the oil tank through the third hydraulically controlled valve 21 and the first throttle valve 20; the pressure oil flowing out from the second working oil port 13b of the fourth reversing valve 13 reaches the second input port of the feed and pull-up oil cylinder 27, and the pressure oil pushes the feed and pull-up oil cylinder 27 to perform a slow pulling action.

[0114] From the above analysis, it can be known that when the drilling rig is disassembling the drill pipe, it is only necessary to operate the fourth reversing valve 13 to put it in the first reversing position a13, so as to realize the linkage of the two actions of reverse slow rotation of the rotary motor 26 and slow pulling of the feed and pull cylinder 27.

[0115] When the drilling rig is disassembling and assembling the drill pipe, the fourth reversing valve 13 is operated to be in the second reversing position b13. At this time, the pressure oil flows out from the first working oil port 13a of the fourth reversing valve 13 and reaches the first hydraulic control port 8x of the first hydraulic control reversing valve 8, thereby pushing the first hydraulic control reversing valve 8 to switch to the second reversing position b8; at this time, the output port of the fourth pressure reducing valve 7 is connected with the first hydraulic control port 25X1 of the rotary motor control valve 25, and the pressure oil flows into the first hydraulic control port 25X1 of the rotary motor control valve 25 after passing through the fourth pressure reducing valve 7, thereby pushing the rotary motor control valve 25 to slightly reverse, so as to realize the forward slow rotation of the rotary motor 26;

[0116] At the same time, the pressure oil flowing out of the first working oil port 13a of the fourth reversing valve 13 reaches the first hydraulic control port 21X1 of the third hydraulic control reversing valve 21, and pushes the third hydraulic control reversing valve 21 to the first reversing position a21. At this time, the second input port of the feed and pull-in oil cylinder 27 is connected with the oil tank through the third hydraulic control valve 21 and the first throttle valve 20; the pressure oil flowing out of the first working oil port 13a of the fourth reversing valve 13 reaches the first input port of the feed and pull-in oil cylinder 27, and the pressure oil pushes the feed and pull-in oil cylinder 27 to perform a slow feeding action;

[0117] From the above analysis, it can be known that when the drilling rig is disassembling the drill pipe, it is only necessary to operate the fourth reversing valve 13 to put it in the second reversing position b13, so as to realize the linkage of the two actions of the forward slow rotation of the rotary motor 26 and the slow feeding of the feed and pull cylinder 27.

[0118] To summarize the above analysis, when the drilling rig disassembles and assembles the drill pipe, it is only necessary to control the fourth reversing valve 13 separately to realize the simultaneous operation of the rotary motor 26 and the feed and pull-out cylinder 27, and the system will automatically select the working status of the rotary motor 26 and the feed and pull-out cylinder 27 according to the actual working conditions, thereby reducing the complexity of the drilling rig operation, reducing the probability of misoperation, and reducing labor intensity.

[0119] Embodiment 2

[0120] Figure 2 This is a schematic diagram of the hydraulic principle of the embodiment of the utility model when the system has a brake. Because the brake 29 is added to the drilling system, the sixth reversing valve 28 is added to control the opening and closing of the brake. The pressure oil enters the first input port 28p of the sixth reversing valve 28 after passing through the third pressure reducing valve 6. The sixth reversing valve 28 is operated to be in the first reversing position a28. At this time, the pressure oil flows out through the second working oil port 28b of the sixth reversing valve 28 and reaches the control oil port of the brake 29, thereby opening the brake 29. At the same time, the pressure oil also reaches the first input port 5p of the third reversing valve 5.

[0121] It can be seen from this that when the system has a brake, the reversing valve 28 must be operated to open the brake first, and then the third reversing valve 5 can be operated to control the forward rotation of the rotary motor 26, which avoids operating the rotation of the rotary motor when the brake is not opened; operate the sixth reversing valve 28 to put it in the third reversing position c28, and the pressure oil in the brake 29 returns through the first output port 28t of the sixth reversing valve 28, thereby achieving the closure of the brake 29.

[0122] It should be noted that the difference between Example 1 and Example 2 is that Example 2 adds a brake 29 and a sixth reversing valve 28 on the basis of Example 1. Example 2 is suitable for use in the case where the forward rotation action of the rotary motor 26 needs to be controlled, and has high safety.

[0123] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0124] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A drilling control valve for a directional drilling rig in a coal mine, comprising a first pressure reducing valve, a second pressure reducing valve, a first reversing valve, a second reversing valve, a third reversing valve, a fourth reversing valve, a fifth reversing valve, a first main input port, a first main output port, a first main working oil port, a second main working oil port, a third main working oil port, a fourth main working oil port, a fifth main working oil port, a sixth main working oil port, a seventh main working oil port, an eighth main working oil port, and a ninth main working oil port, characterized in that: It also includes a fourth pressure reducing valve, a first hydraulically controlled reversing valve, a first shuttle valve, a sixth pressure reducing valve, a second hydraulically controlled reversing valve, a first check valve, a second check valve, a third hydraulically controlled reversing valve, and a first throttle valve; The first shuttle valve includes a first input port, a second input port and an output port, the sixth pressure reducing valve, the fourth pressure reducing valve, the first check valve, the second check valve, the first throttle valve, the second check valve and the first throttle valve all include an output port and an input port, the first hydraulically controlled reversing valve, the second hydraulically controlled reversing valve and the third hydraulically controlled reversing valve all include a first input port, a first output port, a second input port and a first hydraulically controlled port, the third hydraulically controlled reversing valve also includes a second hydraulically controlled port, the third reversing valve, the fourth reversing valve and the fifth reversing valve all include a first working oil port, a second working oil port, a first output port and a first input port; The first working oil port of the third reversing valve is communicated with the first input port of the first shuttle valve, the second working oil port of the third reversing valve is communicated with the input port of the sixth pressure reducing valve, the first output port of the third reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, the output port of the sixth pressure reducing valve is communicated with the second input port of the first shuttle valve, the output port of the first shuttle valve is communicated with the first input port of the first hydraulically controlled reversing valve, the first working oil port of the fourth reversing valve is communicated with the first hydraulically controlled port of the first hydraulically controlled reversing valve and the input port of the first check valve respectively, the second working oil port of the fourth reversing valve is communicated with the first hydraulically controlled port of the second hydraulically controlled reversing valve and the input port of the second check valve respectively, and the first output port of the fourth reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine; The output port of the fourth pressure reducing valve is respectively communicated with the second input port of the first hydraulically controlled reversing valve and the second input port of the second hydraulically controlled valve, the first input port of the second hydraulically controlled reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, the first working oil port of the fifth reversing valve is respectively communicated with the output port of the first one-way valve, the first input port of the third hydraulically controlled reversing valve and the eighth main working oil port of the drilling control valve of the directional drilling rig in the coal mine, the second working oil port of the fifth reversing valve is respectively communicated with the output port of the second one-way valve, the second input port of the third hydraulically controlled reversing valve is communicated with the ninth main working oil port of the drilling control valve of the directional drilling rig in the coal mine, and the fifth reversing valve is respectively communicated with the output port of the second one-way valve, the second input port of the third hydraulically controlled reversing valve is communicated with the ninth main working oil port of the drilling control valve of the directional drilling rig in the coal mine The first output port of the directional valve is communicated with the first main output port of the drilling control valve of the underground coal mine directional drilling rig, the first input port of the third hydraulically controlled reversing valve is communicated with its first hydraulic control port, the second input port of the third hydraulically controlled reversing valve is communicated with its second hydraulic control port, the first output port of the third hydraulically controlled reversing valve is communicated with the input port of the first throttle valve, the output port of the first throttle valve is communicated with the first main output port of the drilling control valve of the underground coal mine directional drilling rig, the first output port of the first hydraulically controlled reversing valve is communicated with the sixth main working oil port of the drilling control valve of the underground coal mine directional drilling rig, and the first output port of the second hydraulically controlled reversing valve is communicated with the seventh main working oil port of the drilling control valve of the underground coal mine directional drilling rig.

2. The drilling control valve for underground directional drilling rig in coal mine according to claim 1, characterized in that: The first hydraulically controlled reversing valve further includes a first reversing position and a second reversing position. When the first hydraulically controlled reversing valve is in the first reversing position, the first input port of the first hydraulically controlled reversing valve is connected to the first output port, and the second input port of the first hydraulically controlled reversing valve is closed. When the first hydraulically controlled reversing valve is in the second reversing position, the second input port of the first hydraulically controlled reversing valve is connected to the first output port, and the first input port of the first hydraulically controlled reversing valve is closed. The second hydraulically controlled reversing valve further comprises a first reversing position and a second reversing position. When the second hydraulically controlled reversing valve is in the first reversing position, the first input port and the first output port of the second hydraulically controlled reversing valve are connected, and the second input port of the second hydraulically controlled reversing valve is closed. When the second hydraulically controlled reversing valve is in the second reversing position, the second input port and the first output port of the second hydraulically controlled reversing valve are connected, and the first input port of the second hydraulically controlled reversing valve is closed. The third hydraulically controlled reversing valve includes a first reversing position, a second reversing position and a third reversing position. When the third hydraulically controlled reversing valve is in the first reversing position, the first input port of the third hydraulically controlled reversing valve is closed, and the first output port of the third hydraulically controlled reversing valve is connected to the second input port. When the third hydraulically controlled reversing valve is in the second reversing position, the second input port of the third hydraulically controlled reversing valve is closed, and the first output port of the third hydraulically controlled reversing valve is connected to the first input port. When the third hydraulically controlled reversing valve is in the third reversing position, the first input port, the first output port and the second input port of the third hydraulically controlled reversing valve are all closed.

3. The drilling control valve for underground directional drilling rig in coal mine according to claim 1 or 2, characterized in that: The third reversing valve comprises: A first reversing position, when the third reversing valve is in the first reversing position, the first input port of the third reversing valve is connected to the second working oil port, and the first working oil port of the third reversing valve is connected to the first output port; The second reversing position, when the third reversing valve is in the second reversing position, the first input port of the third reversing valve is connected to the first working oil port, and the second working oil port of the third reversing valve is connected to the first output port; The third reversing position, when the third reversing valve is in the third reversing position, the first input port of the third reversing valve is closed, and the first working oil port and the second working oil port of the third reversing valve are both connected to the first output port.

4. The drilling control valve for underground directional drilling rig in coal mine according to claim 1 or 2, characterized in that: The fourth reversing valve comprises: The first reversing position, when the fourth reversing valve is in the first reversing position, the first input port of the fourth reversing valve is connected to the second working oil port, and the first working oil port of the fourth reversing valve is connected to the first output port; The second reversing position, when the fourth reversing valve is in the second reversing position, the first input port of the fourth reversing valve is connected to the first working oil port, and the second working oil port of the fourth reversing valve is connected to the first output port; The third reversing position, when the fourth reversing valve is in the third reversing position, the first input port of the fourth reversing valve is closed, and the first working oil port and the second working oil port of the fourth reversing valve are both connected to the first output port.

5. The drilling control valve for underground directional drilling rig in coal mine according to claim 1, characterized in that: The fifth reversing valve comprises: The first reversing position, when the fifth reversing valve is in the first reversing position, the first input port of the fifth reversing valve is connected to the second working oil port, and the first working oil port of the fifth reversing valve is connected to the first output port; The second reversing position, when the fifth reversing valve is in the second reversing position, the first input port of the fifth reversing valve is connected to the first working oil port, and the second working oil port of the fifth reversing valve is connected to the first output port; The third reversing position: when the fifth reversing valve is in the third reversing position, the first input port, the first output port, the first working oil port, and the second working oil port of the fifth reversing valve are all closed.

6. The drilling control valve for underground directional drilling rigs in coal mines according to claim 1, characterized in that: The first pressure reducing valve and the second pressure reducing valve both include an input port and an output port, and the first reversing valve and the second reversing valve both include a first working oil port, a second working oil port, a first output port and a first input port; The input port of the first pressure reducing valve is communicated with the input port of the second pressure reducing valve and the first main input port of the drilling control valve of the directional drilling rig in the coal mine, respectively; the output port of the first pressure reducing valve is communicated with the first main working oil port of the drilling control valve of the directional drilling rig in the coal mine, and the output port of the second pressure reducing valve is communicated with the first input port of the first reversing valve and the first input port of the second reversing valve, respectively; the first output port of the first reversing valve and the first output port of the second reversing valve are both communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine, the first working oil port of the first reversing valve is communicated with the second main working oil port of the drilling control valve of the directional drilling rig in the coal mine, the second working oil port of the first reversing valve is communicated with the third main working oil port of the drilling control valve of the directional drilling rig in the coal mine, the first working oil port of the second reversing valve is communicated with the fourth main working oil port of the drilling control valve of the directional drilling rig in the coal mine, and the second working oil port of the second reversing valve is communicated with the fifth main working oil port of the drilling control valve of the directional drilling rig in the coal mine.

7. The drilling control valve for underground directional drilling rig in coal mine according to claim 6, characterized in that: The first reversing valve also includes: A first reversing position, when the first reversing valve is in the first reversing position, the first input port of the first reversing valve is connected to the second working oil port, and the first working oil port of the first reversing valve is connected to the first output port; a second reversing position, when the first reversing valve is in the second reversing position, the first input port of the first reversing valve is connected to the first working oil port, and the second working oil port of the first reversing valve is connected to the first output port; The third reversing position: when the first reversing valve is in the third reversing position, the first input port of the first reversing valve is closed, and the first working oil port and the second working oil port of the first reversing valve are both connected to the first output port.

8. The drilling control valve for underground directional drilling rig in coal mine according to claim 6 or 7, characterized in that: The second reversing valve comprises: A first reversing position, when the second reversing valve is in the first reversing position, the first input port of the second reversing valve is connected to the second working oil port, and the first working oil port of the second reversing valve is connected to the first output port; A second reversing position, when the second reversing valve is in the second reversing position, the first input port of the second reversing valve is connected to the first working oil port, and the second working oil port of the second reversing valve is connected to the first output port; The third switching position: when the second switching valve is in the third switching position, the first input port of the second switching valve is closed, and the first working oil port and the second working oil port of the second switching valve are both connected to the first output port.

9. The drilling control valve for underground directional drilling rig in coal mine according to claim 1 or 6, characterized in that: The drilling control valve of the underground directional drilling rig in a coal mine also includes a third pressure reducing valve, which includes an input port and an output port. The input port of the third pressure reducing valve is connected to the first main input port of the drilling control valve of the underground directional drilling rig in a coal mine, and the output port of the third pressure reducing valve is connected to the first input port of the third reversing valve.

10. The drilling control valve for underground directional drilling rig in coal mine according to claim 1 or 6, characterized in that: The drilling control valve of the underground directional drilling rig in a coal mine also includes a fifth pressure reducing valve and a first speed regulating valve. The fifth pressure reducing valve and the first speed regulating valve both include an input port and an output port. The input port of the fifth pressure reducing valve is connected to the first main input port of the drilling control valve of the underground directional drilling rig in a coal mine, the output port of the fifth pressure reducing valve is connected to the input port of the first speed regulating valve, and the output port of the first speed regulating valve is connected to the first input port of the fourth reversing valve.

11. The drilling control valve for underground directional drilling rig in coal mine according to claim 6, characterized in that: The drilling control valve of the underground directional drilling rig in a coal mine also includes a seventh pressure reducing valve and a second speed regulating valve. The seventh pressure reducing valve and the second speed regulating valve both include an input port and an output port. The input port of the seventh pressure reducing valve is connected to the first main input port of the drilling control valve of the underground directional drilling rig in a coal mine, the output port of the seventh pressure reducing valve is connected to the input port of the second speed regulating valve, and the output port of the second speed regulating valve is connected to the first input port of the fifth reversing valve.

12. The drilling control valve for underground directional drilling rig in coal mine according to claim 11, characterized in that: The coal mine underground directional drilling rig drilling control valve also includes an eighth pressure reducing valve, a seventh reversing valve, an eleventh main working oil port and a twelfth main working oil port. The eighth pressure reducing valve includes an input port and an output port. The seventh reversing valve includes a first working oil port, a second working oil port, a first input port and a first output port. The input port of the eighth pressure reducing valve is communicated with the first main input port of the coal mine underground directional drilling rig drilling control valve, the output port of the eighth pressure reducing valve is communicated with the first input port of the seventh reversing valve, the first working oil port of the eighth reversing valve is communicated with the eleventh main working oil port of the coal mine underground directional drilling rig drilling control valve, the second working oil port of the eighth reversing valve is communicated with the twelfth main working oil port of the coal mine underground directional drilling rig drilling control valve, and the first output port of the eighth reversing valve is communicated with the first main output port of the coal mine underground directional drilling rig drilling control valve.

13. The drilling control valve for underground directional drilling rig in coal mine according to claim 12, characterized in that: The seventh reversing valve comprises: The first reversing position, when the seventh reversing valve is in the first reversing position, the first input port of the seventh reversing valve is connected to the second working oil port, and the first working oil port of the seventh reversing valve is connected to the first output port; The second reversing position, when the seventh reversing valve is in the second reversing position, the first input port of the seventh reversing valve is connected to the first working oil port, and the second working oil port of the seventh reversing valve is connected to the first output port; The third reversing position, when the seventh reversing valve is in the third reversing position, the first input port of the seventh reversing valve is closed, and the first working oil port and the second working oil port of the seventh reversing valve are both connected to the first output port.

14. The drilling control valve for underground directional drilling rig in coal mine according to claim 12, characterized in that: The drilling control valve of the underground directional drilling rig in the coal mine also includes a third pressure reducing valve, a sixth reversing valve, a feed and pull-out oil cylinder and a tenth main working oil port, the third pressure reducing valve includes an input port and an output port, the sixth reversing valve includes a first working oil port, a second working oil port, a first input port and a first output port, the feed and pull-out oil cylinder includes a main valve, a first input port and a second input port, the main valve includes a first hydraulic control port or a second hydraulic control port, and the rotary motor control valve includes a first hydraulic control port and a second hydraulic control port; The input port of the third pressure reducing valve is communicated with the first main input port of the drilling control valve of the directional drilling rig in the coal mine, the output port of the third pressure reducing valve is communicated with the first input port of the sixth reversing valve, the first working oil port of the sixth reversing valve is closed, the second working oil port of the sixth reversing valve is respectively communicated with the first input port of the third reversing valve and the tenth main working oil port of the drilling control valve of the directional drilling rig in the coal mine, and the first output port of the sixth reversing valve is communicated with the first main output port of the drilling control valve of the directional drilling rig in the coal mine.

15. The drilling control valve for underground directional drilling rig in coal mine according to claim 14, characterized in that: The sixth reversing valve comprises: The first reversing position, when the sixth reversing valve is in the first reversing position, the first input port of the sixth reversing valve is connected to the second working oil port, and the first working oil port of the sixth reversing valve is connected to the first output port; The second reversing position, when the sixth reversing valve is in the second reversing position, the first input port of the sixth reversing valve is connected to the first working oil port, and the second working oil port of the sixth reversing valve is connected to the first output port; The third switching position, when the sixth switching valve is in the third switching position, the first input port of the sixth switching valve is closed, and the first working oil port and the second working oil port of the sixth switching valve are both connected to the first output port.

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