阅读说明：本技术 一种煤矿联动钻机液压控制系统及其控制方法 (Hydraulic control system and control method for coal mine linkage drilling machine ) 是由 周涛 史春宝 王清峰 雷丰励 龙威 陈果 李和祥 罗华 杜渔舟 谢杰 于 2021-10-18 设计创作，主要内容包括：本发明涉及一种煤矿联动钻机液压控制系统及其控制方法,包括手动换向阀、液控换向阀、逻辑控制阀、梭阀和减压阀。手动换向阀和液控换向阀具有三个工作位：下钻位a位(夹持器夹紧、卡盘松开)；中间加接/拆卸钻杆位o位(夹持器夹紧、卡盘夹紧)；起钻位b位(夹持器松开、卡盘夹紧)。减压阀通过减压油路C1与手动换向阀连接,手动换向阀通过两条支路控制液控换向阀：一条支路通过逻辑控制阀直接进入K1口,另一条支路通过梭阀与A1口压力进行比较,压力高者通过油路C4进入K2口。设计减压油路保证夹持器始终夹紧钻杆,防止因误操作造成孔内钻杆滑落。设计逻辑控制阀保证动力头正转时卡盘始终夹紧钻杆,避免卡盘松开而导致孔内钻杆抱死。(The invention relates to a hydraulic control system of a coal mine linkage drilling machine and a control method thereof. The manual reversing valve and the hydraulic control reversing valve have three working positions: a bit (clamping by a clamp and loosening by a chuck) at a drilling position; the middle part is additionally connected with/disassembled from a drill rod position o (clamping by a clamp and clamping by a chuck); and b, bit of the bit pulling position (clamp loosening and chuck clamping). The reducing valve is connected with a manual reversing valve through a reducing oil way C1, and the manual reversing valve controls the hydraulic control reversing valve through two branches: one branch is directly fed into port K1 through logic control valve, the other branch is compared with pressure of port A1 through shuttle valve, and the pressure of the high pressure is fed into port K2 through oil path C4. The design of the pressure reducing oil path ensures that the holder always clamps the drill rod, and prevents the drill rod from sliding off in the hole due to misoperation. The logic control valve is designed to ensure that the chuck always clamps the drill rod when the power head rotates forwards, and the phenomenon that the drill rod in the hole is locked due to loosening of the chuck is avoided.)

1. The utility model provides a colliery gang drill hydraulic control system which characterized in that: the hydraulic control reversing valve comprises a manual reversing valve, a hydraulic control reversing valve, a logic control valve, a shuttle valve and a pressure reducing valve;

the Pc port of the reducing valve is connected with an oil outlet of the auxiliary pump, the L1 port is connected back to the hydraulic oil tank, the A1 port of the shuttle valve is connected with a forward rotation oil port of the power head, the A2/B2 port of the manual reversing valve is respectively and correspondingly connected with a small cavity/a large cavity of the frame propulsion oil cylinder, the A3/B3 port of the hydraulic control reversing valve is respectively and correspondingly connected with a clamping cavity/a loosening cavity of the clamp, the A4 port is connected with the chuck, the Pc port of the hydraulic control reversing valve is connected with an oil outlet of the auxiliary pump, the T port is connected back to the hydraulic oil tank, and the L2 port of the logic control valve is connected back to the hydraulic oil tank;

the reducing valve is connected with the manual reversing valve through a reducing oil way C1, and the manual reversing valve is connected with the hydraulic control reversing valve through two branches: one branch comprises an oil way C5 for connecting the manual reversing valve and the logic control valve, and an oil way C6 for connecting a K1 port of the logic control valve and the hydraulic control reversing valve; the other branch comprises an oil path C2 for connecting the manual reversing valve and the shuttle valve, and an oil path C4 for connecting a K2 port of the shuttle valve and the hydraulic control reversing valve; the shuttle valve is connected with a K3 port of the logic control valve through an oil path C3;

the manual reversing valve is a three-position six-way reversing valve, the hydraulic control reversing valve is a three-position five-way reversing valve, the logic control valve is a two-position three-way hydraulic control reversing valve, and the manual reversing valve and the hydraulic control reversing valve have three working positions: a bit a is drilled, and the clamping of the clamp and the loosening of the chuck are performed in a corresponding linkage state; the middle part is additionally connected with/disassembled from the drill rod position o, and the corresponding linkage state is clamp of the clamp holder and clamp of the chuck; and the bit b of the drill pulling position corresponds to the linkage state of loosening the clamp holder and clamping the chuck.

2. A control method of a hydraulic control system of a coal mine linkage drilling machine is characterized by comprising the following steps: the coal mine linked drilling machine hydraulic control system adopted according to claim 1 comprises:

when the manual reversing valve works at the position a or the position b, the pressure reducing valve controls the pressure reducing oil way C1 to be sealed, the pressure reducing oil way C1 does not work, and a drilling machine can normally drill or unload a drill;

when drilling construction needs to connect/dismantle the drilling rod from the centre, when manual switching-over valve worked at o position promptly, at this moment, frame propulsion cylinder control A2 and B2 mouth are dead, and the pressure oil divides two branches to control the liquid accuse switching-over valve through manual switching-over valve in the decompression oil circuit C1 of relief pressure valve: one branch directly enters a K1 port through a logic control valve, the other branch is compared with the pressure of an A1 port through a shuttle valve, and the branch with the high pressure enters a K2 port through an oil way C4; at the moment, the pressure setting value of the pressure reducing valve pressure reducing oil path C1 is set to be slightly larger than the pressure of the port A1; at the moment, the control pressures acting on the two ends of the hydraulic control reversing valve are equal, the hydraulic control reversing valve always works at the o position, the clamp is clamped correspondingly in a linkage state, the chuck is clamped, the pressure set value of the pressure reducing valve is the clamping and maintaining pressure of the clamp, even if the power head is operated to rotate forwards, the clamp can ensure that the drill rod is always reliably clamped, and the drill rod in the hole can be effectively prevented from sliding out due to operation;

in the working process of hole washing, no matter the manual reversing valve works at the position a, the position o or the position b, no matter the power head rotates forwards or backwards, at the moment, pressure oil at the port A1 enters the port K3 of the logic control valve through an oil way C3, and the port K1 of the hydraulic control reversing valve is cut off; meanwhile, the pressure of the port A1 is compared with the pressure of the port A2, the pressure of the port B2 or the pressure of the port C1 through the shuttle valve, and the high pressure person enters the port K2 of the hydraulic control reversing valve through the oil way C4, so that the hydraulic control reversing valve is always ensured to work at the position B, the clamp is loosened in a corresponding linkage state, the chuck is clamped, namely the chuck always reliably clamps the drill rod, and the drill rod in the hole is prevented from being locked.

Technical Field

The invention belongs to the field of coal mine linkage drilling machines, and relates to a hydraulic control system of a coal mine linkage drilling machine and a control method thereof.

Background

The coal mine tunnel full-hydraulic linkage drilling machine is widely applied to underground gas extraction drilling because the drilling machine has the advantages of high automation degree, convenient operation, low labor intensity and the like compared with a transmission single-action drilling machine. At present, current linkage rig is provided with two work positions: a drill-down position and a drill-up position. The functional characteristics and the existing defects are as follows:

1. in the large-inclination drilling construction process, a drill rod is usually additionally connected and detached through a through hole at the tail end of the power head, and when the space of the tail end is limited, the drill rod can only be additionally connected/detached between the chuck and the clamp. At present, a drilling machine can only connect/disassemble a drill rod in the middle of the implementation of a drilling/tripping working position respectively, and when the drill rod is tripped between a clamping device and a chuck, the risk of falling of the drill rod in a hole caused by the loosening of the clamping device due to misoperation exists, and even personal injury accidents are caused.

2. In the process of drilling a hole with a large inclination angle, drill jamming accidents are frequently encountered due to complex geological conditions. In the process of handling the drill sticking accident, the hole washing operation is mainly adopted, namely the power head is operated to rotate forwards, and the rack oil cylinder is operated to reciprocate back and forth (the power head rotates forwards or moves backwards) to finish the hole wall so as to prevent a drill rod in the hole from being locked. The conventional drilling machine can cause the chuck to loosen in the process of forward movement and backward movement of the power head at the drilling down working position and forward movement of the power head at the drilling up working position, the drill rod in the hole is locked immediately, the construction progress is influenced, and the drilling hole can be scrapped when the drilling machine is serious, so that great economic loss is caused.

Disclosure of Invention

In view of this, the present invention aims to provide a hydraulic control system for a coal mine linkage drilling machine and a control method thereof, so as to solve the defects of the existing linkage drilling machine in the large-inclination drilling construction process.

In order to achieve the purpose, the invention provides the following technical scheme:

a hydraulic control system of a coal mine linkage drilling machine comprises a manual reversing valve, a hydraulic control reversing valve, a logic control valve, a shuttle valve and a pressure reducing valve;

the Pc port of the reducing valve is connected with an oil outlet of the auxiliary pump, the L1 port is connected back to the hydraulic oil tank, the A1 port of the shuttle valve is connected with a forward rotation oil port of the power head, the A2/B2 port of the manual reversing valve is respectively and correspondingly connected with a small cavity/a large cavity of the frame propulsion oil cylinder, the A3/B3 port of the hydraulic control reversing valve is respectively and correspondingly connected with a clamping cavity/a loosening cavity of the clamp, the A4 port is connected with the chuck, the Pc port of the hydraulic control reversing valve is connected with an oil outlet of the auxiliary pump, the T port is connected back to the hydraulic oil tank, and the L2 port of the logic control valve is connected back to the hydraulic oil tank;

the reducing valve is connected with the manual reversing valve through a reducing oil way C1, and the manual reversing valve is connected with the hydraulic control reversing valve through two branches: one branch comprises an oil way C5 for connecting the manual reversing valve and the logic control valve, and an oil way C6 for connecting a K1 port of the logic control valve and the hydraulic control reversing valve; the other branch comprises an oil path C2 for connecting the manual reversing valve and the shuttle valve, and an oil path C4 for connecting a K2 port of the shuttle valve and the hydraulic control reversing valve; the shuttle valve is connected with a K3 port of the logic control valve through an oil path C3;

the manual reversing valve is a three-position six-way reversing valve, the hydraulic control reversing valve is a three-position five-way reversing valve, the logic control valve is a two-position three-way hydraulic control reversing valve, and the manual reversing valve and the hydraulic control reversing valve have three working positions: a bit a is drilled, and the clamping of the clamp and the loosening of the chuck are performed in a corresponding linkage state; the middle part is additionally connected with/disassembled from the drill rod position o, and the corresponding linkage state is clamp of the clamp holder and clamp of the chuck; and the bit b of the drill pulling position corresponds to the linkage state of loosening the clamp holder and clamping the chuck.

A control method of a hydraulic control system of a coal mine linkage drilling machine adopts the hydraulic control system of the coal mine linkage drilling machine, and comprises the following steps:

when the manual reversing valve works at the position a or the position b, the pressure reducing valve controls the pressure reducing oil way C1 to be sealed, the pressure reducing oil way C1 does not work, and a drilling machine can normally drill or unload a drill;

when drilling construction needs to connect/dismantle the drilling rod from the centre, when manual switching-over valve worked at o position promptly, at this moment, frame propulsion cylinder control A2 and B2 mouth are dead, and the pressure oil divides two branches to control the liquid accuse switching-over valve through manual switching-over valve in the decompression oil circuit C1 of relief pressure valve: one branch directly enters a K1 port through a logic control valve, the other branch is compared with the pressure of an A1 port through a shuttle valve, and the branch with the high pressure enters a K2 port through an oil way C4; at the moment, the pressure setting value of the pressure reducing valve pressure reducing oil path C1 is set to be slightly larger than the pressure of the port A1; at the moment, the control pressures acting on the two ends of the hydraulic control reversing valve are equal, the hydraulic control reversing valve always works at the o position, the clamp is clamped correspondingly in a linkage state, the chuck is clamped, the pressure set value of the pressure reducing valve is the clamping and maintaining pressure of the clamp, even if the power head is operated to rotate forwards, the clamp can ensure that the drill rod is always reliably clamped, and the drill rod in the hole can be effectively prevented from sliding out due to operation;

in the working process of hole washing, no matter the manual reversing valve works at the position a, the position o or the position b, no matter the power head rotates forwards or backwards, at the moment, pressure oil at the port A1 enters the port K3 of the logic control valve through an oil way C3, and the port K1 of the hydraulic control reversing valve is cut off; meanwhile, the pressure of the port A1 is compared with the pressure of the port A2, the pressure of the port B2 or the pressure of the port C1 through the shuttle valve, and the high pressure person enters the port K2 of the hydraulic control reversing valve through the oil way C4, so that the hydraulic control reversing valve is always ensured to work at the position B, the clamp is loosened in a corresponding linkage state, the chuck is clamped, namely the chuck always reliably clamps the drill rod, and the drill rod in the hole is prevented from being locked.

The invention has the beneficial effects that:

1. according to the invention, an independent middle drill rod connecting/disassembling working position is designed, and through designing a pressure reducing oil path, an initial guaranteed clamping pressure is provided for the clamp holder in the middle drill rod connecting/disassembling process, so that when the drill rod between the clamp holder and the chuck is released, the clamp holder is guaranteed to clamp the drill rod reliably all the time, and the drill rod in the hole is prevented from sliding down due to misoperation.

2. The invention designs a logic control valve on the forward rotation oil path of the power head, designs the forward rotation and propulsion control oil path of the power head into a logic interlocking structure, ensures that a chuck can reliably clamp a drill rod all the time when the power head rotates forwards, and avoids locking of the drill rod in a hole due to loosening of the chuck in the process of handling the drill clamping accident.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.

Drawings

For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram of the principle of the present invention.

Reference numerals: the hydraulic control reversing valve comprises a manual reversing valve 1, a hydraulic control reversing valve 2, a logic control valve 3, a shuttle valve 4 and a pressure reducing valve 5.

Detailed Description

The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.

Referring to fig. 1, a hydraulic control system of a coal mine linkage drilling machine comprises a manual reversing valve 1, a hydraulic control reversing valve 2, a logic control valve 3, a shuttle valve 4 and a pressure reducing valve 5;

a Pc port of the reducing valve 5 is connected with an oil outlet of an auxiliary pump (the auxiliary pump is an auxiliary pump of a hydraulic oil tank), an L1 port is connected back to the hydraulic oil tank, an A1 port of the shuttle valve 4 is connected with a forward rotation oil port of a power head, an A2/B2 port of the manual reversing valve 1 is correspondingly connected with a small cavity/a large cavity of a frame propulsion oil cylinder respectively, an A3/B3 port of the hydraulic control reversing valve 2 is correspondingly connected with a clamping cavity/a loosening cavity of a clamp, an A4 port is connected with a chuck, a Pc port of the hydraulic control reversing valve 2 is connected with an oil outlet of the auxiliary pump, a T port is connected back to the hydraulic oil tank, and an L2 port of the logic control valve 3 is connected back to the hydraulic oil tank;

the pressure reducing valve 5 is connected with the manual reversing valve 1 through a pressure reducing oil way C1, and the manual reversing valve 1 is connected with the hydraulic control reversing valve 2 through two branches: one branch comprises an oil way C5 for connecting the manual reversing valve 1 and the logic control valve 3, and an oil way C6 for connecting the logic control valve 3 and a K1 port of the hydraulic control reversing valve 2; the other branch comprises an oil path C2 for connecting the manual reversing valve 1 and the shuttle valve 4, and an oil path C4 for connecting the shuttle valve 4 and a K2 port of the hydraulic control reversing valve 2; the shuttle valve 4 is connected with a K3 port of the logic control valve 3 through an oil path C3;

the manual reversing valve 1 is a three-position six-way reversing valve and is used for switching the working state of a drilling hole, the hydraulic control reversing valve 2 is a three-position five-way reversing valve and is used for controlling the linkage action of a chuck and a clamp holder, the logic control valve 3 is a two-position three-way hydraulic control reversing valve and is used for cutting off a K1 port of the hydraulic control reversing valve 2, and the shuttle valve 4 is used for comparing and selecting the forward rotation pressure of the power head and the set pressure of the reducing valve 5 so as to control the action of the hydraulic control reversing valve 2. The pressure reducing valve 5 is used to provide a control pressure that is compared with the forward rotation pressure of the power head.

The manual reversing valve 1 and the hydraulic control reversing valve 2 have three working positions: a bit a is drilled, and the clamping of the clamp and the loosening of the chuck are performed in a corresponding linkage state; the middle part is additionally connected with/disassembled from the drill rod position o, and the corresponding linkage state is clamp of the clamp holder and clamp of the chuck; the bit b of the drill-out position,

the control method of the hydraulic control system of the coal mine linkage drilling machine specifically comprises the following steps:

when the manual reversing valve 1 works at the position a or the position b, the pressure reducing valve 5 controls the pressure reducing oil way C1 to be sealed, the pressure reducing oil way C1 does not work, and a drilling machine can normally drill or unload a drill;

when drilling construction needs to connect/disconnect a drill rod from the middle, namely the manual reversing valve 1 works at the o position, at the moment, the ports A2 and B2 are controlled to be sealed by the frame propulsion oil cylinder, and pressure oil in a pressure reducing oil path C1 of the pressure reducing valve 5 is divided into two branches through the manual reversing valve 1 to control the hydraulic control reversing valve 2: one branch directly enters a K1 port through a logic control valve 3, the pressure of the other branch is compared with the pressure of an A1 port through a shuttle valve 4, and the branch with the high pressure enters a K2 port through an oil way C4; at the moment, the pressure setting value (such as 3-5 MPa) of the pressure reducing oil way C1 of the pressure reducing valve 5 is set to be slightly larger than the pressure of an A1 port; at the moment, the control pressures acting on the two ends of the hydraulic control reversing valve 2 are equal, the hydraulic control reversing valve 2 always works at the o position, the corresponding linkage state is clamping of the clamp holder, clamping of the chuck is realized, the pressure set value of the pressure reducing valve 5 is clamping and maintaining pressure of the clamp holder, even if the power head is operated to rotate the handle in the forward direction, the clamp holder can guarantee reliable clamping of the drill rod all the time, and the drill rod in the hole can be effectively prevented from sliding out due to operation;

in the working process of hole washing, no matter the manual reversing valve 1 works at the position a, the position o or the position b, no matter the power head rotates forwards or backwards, at the moment, pressure oil at the port A1 enters the port K3 of the logic control valve 3 through an oil way C3, and the port K1 of the hydraulic control reversing valve 2 is cut off; meanwhile, the pressure of the port A1 is compared with the pressure of the port A2, the pressure of the port B2 or the pressure of the port C1 through the shuttle valve 4, and the pressure of the port A1 enters the port K2 of the hydraulic control reversing valve 2 through the oil passage C4, so that the hydraulic control reversing valve 2 is always ensured to work at the position B, the corresponding linkage state is that the clamp is loosened, the clamp chuck is clamped, namely the clamp chuck always reliably clamps the drill rod, and the drill rod in the hole is prevented from being locked.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.