阅读说明：本技术 一种煤矿液压支架用液控单向阀 (Hydraulic control one-way valve for coal mine hydraulic support ) 是由 王盼 贺继龙 其他发明人请求不公开姓名 于 2020-07-24 设计创作，主要内容包括：本发明公开了一种煤矿液压支架用液控单向阀,包括阀体,所述阀体的左端设有A口、右端设有与液压缸的有杆腔连通的C口,所述阀体内设有与A口连通的左一通孔,以及与C口连通的右一通孔,所述阀体的左端设有左阀孔、右端设有与左阀孔同轴且连通的右阀孔,所述左阀孔的左端开口处固定安装有左螺堵,所述右阀孔的右端开口处固定安装有右螺堵,所述左螺堵内设有B口,所述右螺堵内设有与液压缸的无杆腔连通的D口；所述阀体内设有大流量阀芯组件和小流量阀芯组件,所述大流量阀芯组件用于控制B口和D口的通断,所述小流量阀芯组件用于控制A口和C口的通断；该液控单向阀结构简单,成本低。(The invention discloses a hydraulic control one-way valve for a coal mine hydraulic support, which comprises a valve body, wherein the left end of the valve body is provided with an A port, the right end of the valve body is provided with a C port communicated with a rod cavity of a hydraulic cylinder, a left through hole communicated with the A port and a right through hole communicated with the C port are arranged in the valve body, the left end of the valve body is provided with a left valve hole, the right end of the valve body is provided with a right valve hole coaxial with and communicated with the left valve hole, a left plug is fixedly arranged at the opening at the left end of the left valve hole, a right plug is fixedly arranged at the opening at the right end of the right valve hole, a B port is arranged in the left plug, and a D port communicated with a rodless; a large-flow valve core assembly and a small-flow valve core assembly are arranged in the valve body, the large-flow valve core assembly is used for controlling the connection and disconnection of the port B and the port D, and the small-flow valve core assembly is used for controlling the connection and disconnection of the port A and the port C; the hydraulic control one-way valve is simple in structure and low in cost.)

1. A hydraulic control one-way valve for a coal mine hydraulic support comprises a valve body and is characterized in that an A port is arranged at the left end of the valve body, a C port communicated with a rod cavity of a hydraulic cylinder is arranged at the right end of the valve body, a left through hole communicated with the A port and a right through hole communicated with the C port are arranged in the valve body, a left valve hole is arranged at the left end of the valve body, a right valve hole coaxial with and communicated with the left valve hole is arranged at the right end of the valve body, a left plug is fixedly arranged at an opening at the left end of the left valve hole, a right plug is fixedly arranged at an opening at the right end of the right valve hole, a B port is arranged in the left plug, and a D port communicated with a rod-free cavity; the high-flow valve core assembly and the low-flow valve core assembly are arranged in the valve body and are used for controlling the connection and disconnection of the port B and the port D, the low-flow valve core assembly is used for controlling the connection and disconnection of the port A and the port C, the high-flow valve core assembly and the low-flow valve core assembly are both opened when the port A or the port B feeds liquid, and the high-flow valve core assembly and the low-flow valve core assembly are both closed when the port A and the port B are both communicated with an oil tank.

2. The hydraulic control one-way valve for the coal mine hydraulic support according to claim 1, wherein the large-flow valve core assembly comprises a large valve core and a first spring, a first valve hole which is coaxial with and has the same diameter as the right valve hole is formed at the right end of the left plug, the large valve core is connected in the right valve hole in a sliding mode, and the left end of the large valve core extends into the first valve hole; the left plug is provided with a left valve port communicated with the port B at the left end of the first valve hole, and the left end of the large valve core is provided with a first cone for controlling the on-off of the left valve port; a convex shoulder which is connected in a sliding manner in the left valve hole is arranged on the outer side of the large valve core along the radial direction, a first cavity communicated with the left through hole is formed between the left plug and the convex shoulder in the left valve hole, and a second cavity communicated with the atmosphere is formed between the convex shoulder and the right end of the left valve hole; a valve seat block which is connected in the right valve hole in a sliding manner is fixedly arranged at the right end of the large valve core in the right valve hole; a second valve hole penetrating left and right is formed in the valve seat block, and a convex sleeve extending into the second valve hole is arranged at the left end of the right plug; the first spring is positioned between the valve seat block and the right plug and used for forcing the valve seat block to drive the large valve core to move leftwards; the right end of the big valve core is provided with a first ring groove, the left end of the first ring groove in the big valve core is provided with a second ring groove, and a convex shaft is formed at the center of the first ring groove and the center of the second ring groove on the big valve core; a third chamber is formed between the left end of the large valve core and the left end of the first valve hole in the first valve hole, and a first oil hole for communicating the third chamber with the D port is formed in the first cone, the large valve core and the protruding shaft;

the small-flow valve core assembly comprises a small valve core and a second spring, the small valve core is connected to the convex shaft in a sliding mode, the outer side of the left end of the small valve core is connected into the second annular groove in a sliding mode, and the outer side of the right end of the small valve core is connected into the second valve hole in a sliding mode; the outer side of the small valve core is radially provided with a conical bulge positioned in the first annular groove, the conical bulge is used for controlling the on-off of the second valve hole, and the second spring is positioned between the left end of the first annular groove and the conical bulge and used for forcing the small valve core to move rightwards; a left annular groove communicated with the left through hole is formed in the outer side of the big valve core and is communicated with the first annular groove, a right annular groove communicated with the right through hole is formed in the outer side of the valve seat block and is communicated with the second valve hole; a right cavity communicated with the port D is formed between the valve seat block and the right plug in the right valve hole; a left cavity communicated with the port D is formed between the left end of the small valve core in the second annular groove and the left end of the second annular groove;

when liquid is fed from the port A or the port B, the large valve core drives the valve seat block to move rightwards, the first cone opens the left valve port, the conical protrusion opens the second valve hole, and the right end of the small valve core abuts against the left end of the convex sleeve; when the port A and the port B are communicated with the oil tank, the first cone is pressed on the left valve port, and the conical protrusion is pressed on the left end of the second valve hole.

3. The hydraulic control one-way valve for the coal mine hydraulic support is characterized in that a second oil hole for communicating the left ring groove with the first ring groove is formed in the big valve core; the valve seat block is internally provided with a third oil hole used for communicating the right annular groove with the second valve hole, and the outer side of the circumference of the small valve core is provided with a third annular groove communicated with the third oil hole on the right side of the conical bulge.

4. The hydraulic control one-way valve for the coal mine hydraulic support according to claim 2, wherein a fourth oil hole for communicating a left valve port with a port B is formed in the left plug; and a fifth oil hole for communicating the D port with the inner cavity of the convex sleeve is formed in the right plug.

5. The hydraulic control one-way valve for the coal mine hydraulic support according to claim 4, wherein a sixth oil hole for communicating the left chamber with the inner cavity of the convex sleeve is formed in the small valve element, and a seventh oil hole for communicating the right chamber with the fifth oil hole is formed in the right plug.

6. The hydraulic control one-way valve for the coal mine hydraulic support according to claim 2, wherein a left second through hole for communicating the left first through hole with the first chamber and an air hole communicated with the second chamber are formed in the valve body.

Technical Field

The invention relates to the technical field of backup valves of coal mine supporting equipment, in particular to a hydraulic control one-way valve for a hydraulic support.

Background

The hydraulic control one-way valve is mainly used for a coal mine hydraulic support, and controls the balance of the hydraulic support together with the control valve group to protect and help the jack to act. When the operating valve group is in the middle position and the external force action result does not reach the opening pressure of the safety valve, the jack can be kept in a certain working state for a long time, and therefore the hydraulic support can play a corresponding supporting role under the external force action. However, the hydraulic control one-way valve used at present has the following problems:

(1) the structure is relatively complex, the two-way hydraulic control one-way valve in the prior art comprises two sets of identical valve core assemblies and a control piston, each valve core assembly comprises a valve sleeve, a retaining sleeve, a valve seat, a joint, an ejector rod, a spring and the like, and the whole processing difficulty is high and the cost is high;

(2) because two-way pilot operated check valves in the prior art adopt two sets of the same valve core assemblies, and the action areas of a piston cavity and a rod cavity of a hydraulic cylinder are different, the reason of the area difference of the piston cavity and the rod cavity is caused, when the hydraulic cylinder retracts, the oil return amount of the piston cavity is far greater than the oil inlet amount when the hydraulic cylinder extends out, and if the pilot operated check valve with smaller diameter is adopted, the oil return backpressure is larger, and the capacity loss is generated; and the hydraulic control one-way valve with larger diameter has larger volume and higher cost.

Disclosure of Invention

The invention aims to provide a hydraulic control one-way valve for a coal mine hydraulic support, which can effectively seal the channels of an inner layer and an outer layer of continuous oil pipes when unexpected conditions occur, so that well fluid is prevented from returning out, and blowout accidents are prevented.

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

a hydraulic control one-way valve for a coal mine hydraulic support comprises a valve body, wherein the left end of the valve body is provided with an A port, the right end of the valve body is provided with a C port communicated with a rod cavity of a hydraulic cylinder, a left through hole communicated with the A port and a right through hole communicated with the C port are arranged in the valve body, the left end of the valve body is provided with a left valve hole, the right end of the valve body is provided with a right valve hole coaxial with and communicated with the left valve hole, a left plug is fixedly installed at the opening position of the left end of the left valve hole, a right plug is fixedly installed at the opening position of the right end of the right valve hole, a B port is arranged in the left plug, and a D port communicated with a rod; the high-flow valve core assembly and the low-flow valve core assembly are arranged in the valve body and are used for controlling the connection and disconnection of the port B and the port D, the low-flow valve core assembly is used for controlling the connection and disconnection of the port A and the port C, the high-flow valve core assembly and the low-flow valve core assembly are both opened when the port A or the port B feeds liquid, and the high-flow valve core assembly and the low-flow valve core assembly are both closed when the port A and the port B are both communicated with an oil tank.

Furthermore, the large-flow valve core assembly comprises a large valve core and a first spring, a first valve hole which is coaxial with and has the same diameter as the right valve hole is formed in the right end of the left plug, the large valve core is connected in the right valve hole in a sliding mode, and the left end of the large valve core extends into the first valve hole; the left plug is provided with a left valve port communicated with the port B at the left end of the first valve hole, and the left end of the large valve core is provided with a first cone for controlling the on-off of the left valve port; a convex shoulder which is connected in a sliding manner in the left valve hole is arranged on the outer side of the large valve core along the radial direction, a first cavity communicated with the left through hole is formed between the left plug and the convex shoulder in the left valve hole, and a second cavity communicated with the atmosphere is formed between the convex shoulder and the right end of the left valve hole; a valve seat block which is connected in the right valve hole in a sliding manner is fixedly arranged at the right end of the large valve core in the right valve hole; a second valve hole penetrating left and right is formed in the valve seat block, and a convex sleeve extending into the second valve hole is arranged at the left end of the right plug; the first spring is positioned between the valve seat block and the right plug and used for forcing the valve seat block to drive the large valve core to move leftwards; the right end of the big valve core is provided with a first ring groove, the left end of the first ring groove in the big valve core is provided with a second ring groove, and a convex shaft is formed at the center of the first ring groove and the center of the second ring groove on the big valve core; a third chamber is formed between the left end of the large valve core and the left end of the first valve hole in the first valve hole, and a first oil hole for communicating the third chamber with the D port is formed in the first cone, the large valve core and the protruding shaft;

the small-flow valve core assembly comprises a small valve core and a second spring, the small valve core is connected to the convex shaft in a sliding mode, the outer side of the left end of the small valve core is connected into the second annular groove in a sliding mode, and the outer side of the right end of the small valve core is connected into the second valve hole in a sliding mode; the outer side of the small valve core is radially provided with a conical bulge positioned in the first annular groove, the conical bulge is used for controlling the on-off of the second valve hole, and the second spring is positioned between the left end of the first annular groove and the conical bulge and used for forcing the small valve core to move rightwards; a left annular groove communicated with the left through hole is formed in the outer side of the big valve core and is communicated with the first annular groove, a right annular groove communicated with the right through hole is formed in the outer side of the valve seat block and is communicated with the second valve hole; a right cavity communicated with the port D is formed between the valve seat block and the right plug in the right valve hole; a left cavity communicated with the port D is formed between the left end of the small valve core in the second annular groove and the left end of the second annular groove;

when liquid is fed from the port A or the port B, the large valve core drives the valve seat block to move rightwards, the first cone opens the left valve port, the conical protrusion opens the second valve hole, and the right end of the small valve core abuts against the left end of the convex sleeve; when the port A and the port B are communicated with the oil tank, the first cone is pressed on the left valve port, and the conical protrusion is pressed on the left end of the second valve hole.

Furthermore, a second oil hole for communicating the left ring groove with the first ring groove is formed in the large valve core; the valve seat block is internally provided with a third oil hole used for communicating the right annular groove with the second valve hole, and the outer side of the circumference of the small valve core is provided with a third annular groove communicated with the third oil hole on the right side of the conical bulge.

Furthermore, a fourth oil hole for communicating the left valve port with the port B is formed in the left plug; and a fifth oil hole for communicating the D port with the inner cavity of the convex sleeve is formed in the right plug.

Furthermore, a sixth oil hole used for communicating the left cavity and the inner cavity of the convex sleeve is formed in the small valve element, and a seventh oil hole used for communicating the right cavity and the fifth oil hole is formed in the right plug.

Furthermore, a left through hole and a left through hole which are used for communicating the left through hole with the first cavity and an air hole which is communicated with the second cavity are formed in the valve body.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

(1) the valve core assembly of the invention is provided with the large-flow valve core assembly and the small-flow valve core assembly, and the large valve core and the small valve core are sleeved together, so the whole volume is compact, and the structure is simple;

(2) according to the invention, the rodless cavity of the hydraulic cylinder is controlled by adopting the large-flow valve core assembly, and the rod cavity of the hydraulic cylinder is controlled by adopting the small-flow valve core assembly, so that the back pressure of the rodless cavity and the rod cavity during oil return can be reduced, the whole volume is not increased, and the cost is low.

Drawings

FIG. 1 is a cross-sectional view of the present invention with the pilot operated check valve in a locked condition;

FIG. 2 is a hydraulic schematic of the present invention in use;

FIG. 3 is a schematic diagram of the present invention with oil at port A and oil at port B;

FIG. 4 is a schematic diagram of the present invention with oil at port B and oil at port A;

FIG. 5 is a cross-sectional view of the valve body of the present invention;

fig. 6 is a cross-sectional view of the large valve cartridge of the present invention.

Detailed Description

Referring to fig. 1-6, a hydraulic control check valve for a coal mine hydraulic support comprises a valve body 1, wherein the left end of the valve body 1 is provided with an a port, the right end of the valve body 1 is provided with a C port communicated with a rod cavity of a hydraulic cylinder 9, the valve body 1 is internally provided with a left through hole 1a communicated with the a port and a right through hole 1C communicated with the C port, the left end of the valve body 1 is provided with a left valve hole 12, the right end of the valve body 1 is provided with a right valve hole 13 coaxial and communicated with the left valve hole 12, a left plug 2 is fixedly arranged at the left end opening of the left valve hole 12, a right plug 3 is fixedly arranged at the right end opening of the right valve hole 13, a B port is arranged in the left plug 2, and a D port communicated with a rodless cavity of the hydraulic cylinder 9 is; the high-flow valve core assembly and the low-flow valve core assembly are arranged in the valve body 1 and are used for controlling the connection and disconnection of the port B and the port D, the low-flow valve core assembly is used for controlling the connection and disconnection of the port A and the port C, the high-flow valve core assembly and the low-flow valve core assembly are both opened when the port A or the port B feeds liquid, and the high-flow valve core assembly and the low-flow valve core assembly are both closed when the port A and the port B are both communicated with an oil tank.

The large-flow valve core assembly comprises a large valve core 4 and a first spring 7, a first valve hole 21 which is coaxial with and has the same diameter as the right valve hole 13 is arranged at the right end of the left plug 2, the large valve core 4 is connected in the right valve hole 13 in a sliding mode, and the left end of the large valve core extends into the first valve hole 21; the left plug 2 is provided with a left valve port 22 communicated with the port B at the left end of the first valve hole 21, and the left end of the big valve core 4 is provided with a first cone 41 for controlling the on-off of the left valve port 22; a convex shoulder 42 connected in a sliding manner in the left valve hole 12 is arranged on the outer side of the large valve core 4 along the radial direction, a first cavity 4a communicated with the left through hole 1a is formed between the left plug 2 and the convex shoulder 42 in the left valve hole 12, and a second cavity 4b communicated with the atmosphere is formed between the convex shoulder 42 and the right end of the left valve hole 12; a valve seat block 6 which is connected in the right valve hole 13 in a sliding way is fixedly arranged at the right end of the large valve core 4 in the right valve hole 13; a second valve hole 61 penetrating left and right is formed in the valve seat block 6, and a convex sleeve 31 extending into the second valve hole 61 is arranged at the left end of the right plug 3; the first spring 7 is positioned between the valve seat block 6 and the right plug 3 and is used for forcing the valve seat block 6 to drive the large valve core 4 to move leftwards; the right end of the big valve core 4 is provided with a first ring groove 43, the left end of the first ring groove 43 in the big valve core 4 is provided with a second ring groove 44, and a convex shaft 45 is formed at the center of the first ring groove 43 and the second ring groove 44 of the big valve core 4; a third chamber 4f is formed between the left end of the large valve core 4 and the left end of the first valve hole 21 in the first valve hole 21, and a first oil hole 4D for communicating the third chamber 4f with the port D is formed in the first cone 41, the large valve core 4 and the protruding shaft 45.

The small-flow valve core assembly comprises a small valve core 5 and a second spring 8, the small valve core 5 is connected to the protruding shaft 45 in a sliding mode, the outer side of the left end of the small valve core 5 is connected into the second annular groove 44 in a sliding mode, and the outer side of the right end of the small valve core 5 is connected into the second valve hole 61 in a sliding mode; the outer side of the small valve core 5 is provided with a conical projection 51 positioned in the first annular groove 43 along the radial direction, the conical projection 51 is used for controlling the on-off of the second valve hole 61, and the second spring 8 is positioned between the left end of the first annular groove 43 and the conical projection 51 and used for forcing the small valve core 5 to move rightwards; a left annular groove 4e communicated with the left through hole 1a is formed in the outer side of the large valve core 4, a second oil hole 46 used for communicating the left annular groove 4e with the first annular groove 43 is formed in the large valve core 4, a right annular groove 6b communicated with the right through hole 1c is formed in the outer side of the valve seat block 6, and a third oil hole 6a used for communicating the right annular groove 6b with the second valve hole 61 is formed in the valve seat block 6; a third annular groove 52 communicated with the third oil hole 6a is formed in the outer side of the circumference of the small valve core 5 on the right side of the conical bulge 51; a right cavity 14 communicated with the port D is formed between the valve seat block 6 and the right plug 3 in the right valve hole 13; a left chamber 4c communicated with the D port is formed in the second annular groove 44 between the left end of the small valve core 5 and the left end of the second annular groove 44; when liquid is fed into the port A or the port B, the big valve core 4 drives the valve seat block 6 to move rightwards, the first cone 41 opens the left valve port 22, the conical protrusion 51 opens the second valve hole 61, and the right end of the small valve core 5 abuts against the left end of the convex sleeve 31; when the ports A and B are communicated with the oil tank, the first cone 41 is pressed on the left valve port 22, and the conical projection 51 is pressed on the left end of the second valve hole 61.

A fourth oil hole 16 for communicating the left valve port 22 with the port B is formed in the left plug 2; and a fifth oil hole 17 for communicating the D port with the inner cavity of the convex sleeve 31 is formed in the right plug 3. A sixth oil hole 5a for communicating the left chamber 4c with the inner cavity of the convex sleeve 31 is formed in the small valve core 5, and a seventh oil hole 15 for communicating the right chamber 14 with the fifth oil hole 17 is formed in the right plug 3. The valve body 1 is internally provided with a left through hole 1b for communicating the left through hole 1a with the first chamber 4a, and an air hole 1d communicated with the second chamber 4 b.

Fig. 2 is a schematic view of the connection of the present invention in application, in which port D is connected to the rodless chamber of the hydraulic cylinder 9 and port C is connected to the rod chamber of the hydraulic cylinder 9.

When a piston rod of the control hydraulic cylinder 9 extends, the electromagnetic directional valve 10 works in a left position, emulsion at an outlet of the hydraulic pump 11 acts on the first cone 41 after passing through the port B, the fourth oil hole 16 and the left valve port 22, the large valve core 4 is pushed to move rightwards to open the left valve port 22 by overcoming the acting force of the first spring 7, and the emulsion at the port B enters the port D after passing through the fourth oil hole 16, the left valve port 22, the third chamber 4f, the first oil hole 4D and the fifth oil hole 17 to push the piston rod of the hydraulic cylinder 9 to extend; when the large valve core 4 moves rightwards, the valve seat block 6 is driven to move rightwards, so that the right end of the small valve core 5 is abutted against the left end of the convex sleeve 31, the conical protrusion 51 is separated from the left end of the second valve hole 61, and emulsion in the rod cavity of the hydraulic cylinder 9 flows back to the oil tank through the port C, the right through hole 1C, the right annular groove 6b, the third oil hole 6a, the second valve hole 61, the third annular groove 52, the first annular groove 43, the second oil hole 46, the left annular groove 4e and the left through hole 1 a.

When a piston rod of the control hydraulic cylinder 9 retracts, the electromagnetic directional valve 10 works in the right position, emulsion at the outlet of the hydraulic pump 11 enters the first chamber 4a through the left through hole 1a and the left through hole 1b after passing through the port A, acts on the shoulder 42 of the large valve core 4, pushes the large valve core 4 to move rightwards by overcoming the acting force of the first spring 7, drives the first cone 41 to open the left valve port 22, and simultaneously drives the valve seat block 6 to move rightwards, so that the right end of the small valve core 5 is abutted against the left end of the convex sleeve 31, the conical protrusion 51 leaves the left end of the second valve hole 61, the emulsion at the port A enters the port C through the left through hole 1a, the left annular groove 4e, the second oil hole 46, the first annular groove 43, the third annular groove 52, the second valve hole 61, the third oil hole 6a, the right annular groove 6b and the right through hole 1C, and pushes the piston rod of the hydraulic; the emulsion in the rodless cavity flows back to the oil tank through the port D, the fifth oil hole 17, the inner cavity of the convex sleeve 31, the first oil hole 4D, the third chamber 4f, the left valve port 22, the fourth oil hole 16 and the port B.

When the hydraulic cylinder 9 needs to be locked, the electromagnetic directional valve 10 works in the middle position, the port A and the port B are communicated with the oil tank, the large valve core 4 moves leftwards under the action of the first spring 7 to drive the first cone 41 to close the left valve port 22, and meanwhile, the small valve core 5 moves rightwards under the action of the second spring 8 to drive the cone-shaped protrusion 51 to tightly press the left end of the second valve hole 61, so that the locking of the hydraulic cylinder 9 is realized.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.