阅读说明：本技术 一种实现气水联动喷雾的支护系统 (Support system for realizing air-water linkage spraying ) 是由 安世岗 乔金林 吕英华 马威 赵美成 黎志 叶庆树 张设计 李鹏 莫金明 于 2021-09-09 设计创作，主要内容包括：本发明公开一种实现气水联动喷雾的支护系统,属于综采工作面抑尘技术领域。其包括：液压支架以及安装于所述液压支架上的喷雾装置,所述喷雾装置包括：安装于所述液压支架顶支护板下侧的喷头,所述喷头包括气体接口和液体接口；气水控制阀,所述气水控制阀包括与压力气源连通的第一接口、与水源连通的第二接口、与所述喷头的气体接口连通的第三接口以及与所述喷头的液体接口连通的第四接口；所述气水控制阀与所述液压支架的液压支护系统联动,并在液压支架降柱、液压支架收护帮板以及液压支架移架中的一种或多种状态下,控制所述喷头喷雾。本发明解决了现有综采工作面抑尘效果较差的问题。(The invention discloses a supporting system for realizing air-water linkage spraying, and belongs to the technical field of dust suppression of fully mechanized coal mining faces. It includes: hydraulic support and install in atomizer on hydraulic support, atomizer includes: the spray head is arranged on the lower side of the top supporting guard plate of the hydraulic support and comprises a gas interface and a liquid interface; the gas-water control valve comprises a first interface communicated with a pressure gas source, a second interface communicated with a water source, a third interface communicated with a gas interface of the spray head and a fourth interface communicated with a liquid interface of the spray head; the air water control valve is linked with a hydraulic support system of the hydraulic support and controls the spray head to spray in one or more states of a hydraulic support descending column, a hydraulic support collecting and protecting side plate and a hydraulic support moving frame. The invention solves the problem of poor dust suppression effect of the existing fully mechanized coal mining face.)

1. The utility model provides a realize supporting system of air water linkage spraying which characterized in that, it includes:

hydraulic support and install in atomizer on hydraulic support, atomizer includes:

the spray head is arranged on the lower side of the top supporting guard plate of the hydraulic support and comprises a gas interface and a liquid interface;

the gas-water control valve comprises a first interface communicated with a pressure gas source, a second interface communicated with a water source, a third interface communicated with a gas interface of the spray head and a fourth interface communicated with a liquid interface of the spray head;

the air water control valve is linked with a hydraulic support system of the hydraulic support and controls the spray head to spray in one or more states of a hydraulic support descending column, a hydraulic support collecting and protecting side plate and a hydraulic support moving frame.

2. The support system for realizing air-water linkage spraying according to claim 1, wherein the spray heads comprise a first spray head and a second spray head, the spray direction of the first spray head faces to the front end of the top plate of the adjacent hydraulic support in the walking direction of the coal mining machine, and the spray direction of the second spray head faces to the lower edge of the roller of the coal mining machine; the air-water control valve comprises a first air-water control valve and a second air-water control valve, the first air-water control valve is used for controlling the first spray head, and the second air-water control valve is used for controlling the second spray head.

3. The support system for realizing air-water linkage spraying according to claim 2, wherein the first air-water control valve comprises a first control port and a second control port, and the first control port is communicated with the hydraulic support lifting column control cylinder; the second control port is communicated with the hydraulic support moving frame control oil cylinder;

when the hydraulic support descends, the first control port enters pressure liquid and drives the valve core of the first air-water control valve to move, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface;

when the hydraulic support moves, the second control port enters pressure liquid and the valve core of the first air-water control valve moves, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

4. The support system for realizing air-water linkage spraying of claim 3, wherein the valve core of the first air-water control valve comprises a first valve core, a second valve core and a third valve core which are sequentially arranged along a first direction;

a first resetting piece is arranged between the first valve core and the end part of the valve cavity of the first air-water control valve, and a second resetting piece is arranged between the third valve core and the end part of the valve cavity of the first air-water control valve; in the initial position, under the action of the first resetting piece, the first interface and the third interface of the first air water control valve are not communicated; under the action of the second resetting piece, the second interface and the fourth interface of the first air water control valve are not communicated;

the first control port is arranged in the area between the first valve core and the second valve core, and the second control port is arranged in the area between the second valve core and the third valve core; after the first control port or the second control port enters pressure liquid, the first interface of the first air-water control valve is communicated with the third interface, and the second interface of the first air-water control valve is communicated with the fourth interface.

5. The support system for realizing air-water linkage spraying of claim 4, wherein a first plug assembly is arranged at the end part of the valve cavity of the first air-water control valve, and the first plug assembly comprises:

the first valve sleeve is provided with openings at two ends and is connected to the valve body of the first gas-water control valve in a threaded manner, and the first valve core is arranged in the first valve sleeve in a penetrating manner;

the first plug is in threaded connection with the end part of the first valve sleeve;

and the third resetting piece is positioned between the first valve core and the first plug, and the first valve core is abutted to the shoulder of the first valve sleeve by the elastic force of the third resetting piece.

6. The support system for realizing air-water linkage spraying of claim 5, wherein a second plug assembly is arranged at the end of the valve cavity of the first air-water control valve, and the second plug assembly comprises:

the second valve sleeve is provided with openings at two ends and is connected to the valve body of the first gas-water control valve in a threaded manner, and the third valve element is arranged in the second valve sleeve in a penetrating manner;

the second plug is in threaded connection with the end part of the second valve sleeve;

and the fourth resetting piece is positioned between the second valve core and the second plug, and the third valve core is abutted to the shoulder of the second valve sleeve by the elastic force of the fourth resetting piece.

7. The support system for realizing air-water linkage spraying according to claim 2, wherein the second air-water control valve comprises a third control port, and the third control port is communicated with the hydraulic support side protection plate control cylinder;

when the hydraulic support is used for retracting the side protection plate, the third control port enters pressure liquid and drives the valve core of the second air-water control valve to move, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

8. The support system for realizing air-water linkage spraying of claim 7, wherein the valve core of the second air-water control valve comprises a fourth valve core and a fifth valve core which are sequentially arranged along a first direction;

a fifth reset piece is arranged between the fourth valve core and the end part of the valve cavity of the second air water control valve, and a sixth reset piece is arranged between the fifth valve core and the end part of the valve cavity of the second air water control valve; in the initial position, under the action of the fifth resetting piece, the first interface and the third interface of the second air-water control valve are not communicated; under the action of the sixth resetting piece, the second interface and the fourth interface of the second air-water control valve are not communicated;

and the third control port is arranged in the area between the fourth valve core and the fifth valve core, after pressure liquid enters the third control port, the first interface and the third interface of the second air-water control valve are communicated, and the second interface and the fourth interface of the second air-water control valve are communicated.

9. The support system for realizing air-water linkage spraying of claim 8, wherein a third plug assembly is arranged at the end of the valve cavity of the second air-water control valve, and the third plug assembly comprises:

the third valve sleeve is provided with openings at two ends and is connected to the valve body of the second air-water control valve in a threaded manner, and the fourth valve core is arranged in the third valve sleeve in a penetrating manner;

the third plug is in threaded connection with the end part of the third valve sleeve;

and the seventh reset piece is positioned between the fourth valve core and the third plug, and the fourth valve core is abutted to the shoulder of the third valve sleeve by the elastic force of the seventh reset piece.

10. The support system for realizing air-water linkage spraying of claim 9, wherein a fourth plug assembly is arranged at the end of the valve cavity of the second air-water control valve, and the fourth plug assembly comprises:

the fourth valve sleeve is provided with openings at two ends and is in threaded connection with the valve body of the second air-water control valve, and the fifth valve core is arranged in the fourth valve sleeve in a penetrating manner;

the fourth plug is in threaded connection with the end part of the fourth valve sleeve;

and the eighth resetting piece is positioned between the fifth valve core and the fourth plug, and the fifth valve core is abutted to the shoulder of the fourth valve sleeve by the elastic force of the eighth resetting piece.

Technical Field

The invention relates to the technical field of dust treatment of fully mechanized coal mining faces, in particular to a supporting system capable of realizing air-water linkage spraying.

Background

The roller coal cutting of the coal mining machine is one of the most main dust sources of the fully mechanized coal face, the generated dust accounts for more than 60% of the whole fully mechanized coal face, the high-concentration dust threatens physical and mental health of workers and safety production of a mine, the reliability of signal acquisition and transmission of various monitoring systems is influenced, the development of intelligent coal mining in China is restricted, and along with continuous improvement of mechanization and automation degrees of the fully mechanized coal face in China, the production operation efficiency is greatly improved, so that the dust harm of the fully mechanized coal face is more severe.

At present, most of treatments for coal cutting dust sources of fully mechanized coal mining face coal mining machines adopt a spray wetting roller and broken coal bodies around the spray wetting roller to inhibit dust generation, generally spray arranged at the lower part of a coal mining machine or a support top beam is used for rapidly wetting broken coal bodies around the coal mining machine roller, and automatic control of spray is realized by utilizing equipment such as a dust source tracking spray dust settling system. However, for fully mechanized mining surfaces with larger mining height or larger wind speed, the traditional dust suppression spraying has limited range, is difficult to reach the lower edge of the roller and the position of a chute dust source below the roller, cannot effectively suppress dust, and has the disadvantages of complicated control system, larger installation and maintenance workload and improved applicability. In addition, many mines, especially the large-scale mine in the north of China, have strict restrictions on the dustproof water used for the fully mechanized face in order to ensure the coal production quality.

Disclosure of Invention

The invention aims to solve the technical problem that the dust suppression effect of the existing fully mechanized coal mining face is poor.

In order to solve the technical problems, the invention provides the following technical scheme:

the utility model provides a realize supporting system of air water linkage spraying, it includes: hydraulic support and install in atomizer on hydraulic support, atomizer includes: the spray head is arranged on the lower side of the top supporting guard plate of the hydraulic support and comprises a gas interface and a liquid interface; the gas-water control valve comprises a first interface communicated with a pressure gas source, a second interface communicated with a water source, a third interface communicated with a gas interface of the spray head and a fourth interface communicated with a liquid interface of the spray head; the air water control valve is linked with a hydraulic support system of the hydraulic support and controls the spray head to spray in one or more states of a hydraulic support descending column, a hydraulic support collecting and protecting side plate and a hydraulic support moving frame.

In some embodiments of the invention, the spray heads include a first spray head and a second spray head, the spray direction of the first spray head faces the front end of the top plate of the adjacent hydraulic support in the walking direction of the coal mining machine, and the spray direction of the second spray head faces the lower edge of the drum of the coal mining machine; the air-water control valve comprises a first air-water control valve and a second air-water control valve, the first air-water control valve is used for controlling the first spray head, and the second air-water control valve is used for controlling the second spray head.

In some embodiments of the present invention, the first air-water control valve includes a first control port and a second control port, and the first control port is communicated with the hydraulic support lifting column control cylinder; the second control port is communicated with the hydraulic support moving frame control oil cylinder; when the hydraulic support descends, the first control port enters pressure liquid and drives the valve core of the first air-water control valve to move, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface; when the hydraulic support moves, the second control port enters pressure liquid and the valve core of the first air-water control valve moves, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

In some embodiments of the present invention, the valve core of the first gas-water control valve includes a first valve core, a second valve core and a third valve core arranged in sequence along a first direction; a first resetting piece is arranged between the first valve core and the end part of the valve cavity of the first air-water control valve, and a second resetting piece is arranged between the third valve core and the end part of the valve cavity of the first air-water control valve; in the initial position, under the action of the first resetting piece, the first interface and the third interface of the first air water control valve are not communicated; under the action of the second resetting piece, the second interface and the fourth interface of the first air water control valve are not communicated; the first control port is arranged in the area between the first valve core and the second valve core, and the second control port is arranged in the area between the second valve core and the third valve core; after the first control port or the second control port enters pressure liquid, the first interface of the first air-water control valve is communicated with the third interface, and the second interface of the first air-water control valve is communicated with the fourth interface.

In some embodiments of the present invention, a first plug assembly is disposed at an end of a valve cavity of the first air-water control valve, and the first plug assembly includes: the first valve sleeve is provided with openings at two ends and is connected to the valve body of the first gas-water control valve in a threaded manner, and the first valve core is arranged in the first valve sleeve in a penetrating manner; the first plug is in threaded connection with the end part of the first valve sleeve; and the third resetting piece is positioned between the first valve core and the first plug, and the first valve core is abutted to the shoulder of the first valve sleeve by the elastic force of the third resetting piece.

In some embodiments of the present invention, a second plug assembly is disposed at an end of a valve cavity of the first air-water control valve, and the second plug assembly includes: the second valve sleeve is provided with openings at two ends and is connected to the valve body of the first gas-water control valve in a threaded manner, and the third valve element is arranged in the second valve sleeve in a penetrating manner; the second plug is in threaded connection with the end part of the second valve sleeve; and the fourth resetting piece is positioned between the second valve core and the second plug, and the third valve core is abutted to the shoulder of the second valve sleeve by the elastic force of the fourth resetting piece.

In some embodiments of the present invention, the second air-water control valve includes a third control port, and the third control port is communicated with the hydraulic support side protection plate control cylinder; when the hydraulic support is used for retracting the side protection plate, the third control port enters pressure liquid and drives the valve core of the second air-water control valve to move, so that the first interface is communicated with the third interface, and the second interface is communicated with the fourth interface.

In some embodiments of the present invention, the valve core of the second air-water control valve includes a fourth valve core and a fifth valve core arranged in sequence along a first direction; a fifth reset piece is arranged between the fourth valve core and the end part of the valve cavity of the second air water control valve, and a sixth reset piece is arranged between the fifth valve core and the end part of the valve cavity of the second air water control valve; in the initial position, under the action of the fifth resetting piece, the first interface and the third interface of the second air-water control valve are not communicated; under the action of the sixth resetting piece, the second interface and the fourth interface of the second air-water control valve are not communicated; and the third control port is arranged in the area between the fourth valve core and the fifth valve core, after pressure liquid enters the third control port, the first interface and the third interface of the second air-water control valve are communicated, and the second interface and the fourth interface of the second air-water control valve are communicated.

In some embodiments of the present invention, a third plug assembly is disposed at an end of a valve cavity of the second air-water control valve, and the third plug assembly includes: the third valve sleeve is provided with openings at two ends and is connected to the valve body of the second air-water control valve in a threaded manner, and the fourth valve core is arranged in the third valve sleeve in a penetrating manner; the third plug is in threaded connection with the end part of the third valve sleeve; and the seventh reset piece is positioned between the fourth valve core and the third plug, and the fourth valve core is abutted to the shoulder of the third valve sleeve by the elastic force of the seventh reset piece.

In some embodiments of the present invention, a fourth plug assembly is disposed at an end of a valve cavity of the second air-water control valve, and the fourth plug assembly includes: the fourth valve sleeve is provided with openings at two ends and is in threaded connection with the valve body of the second air-water control valve, and the fifth valve core is arranged in the fourth valve sleeve in a penetrating manner; the fourth plug is in threaded connection with the end part of the fourth valve sleeve; and the eighth resetting piece is positioned between the fifth valve core and the fourth plug, and the fifth valve core is abutted to the shoulder of the fourth valve sleeve by the elastic force of the eighth resetting piece.

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

in the support system for realizing gas-water linkage spraying, the spray head is provided with the gas interface and the liquid interface to realize high-pressure spraying after gas-liquid mixing, so that effective dust suppression at a high range can be realized, water consumption is saved, and the problem that the quality of coal output is influenced by excessive water is avoided; meanwhile, the spray of the spray head can be linked with actions of withdrawing, descending, moving and the like of a side protection plate of a hydraulic support system through the air water control valve, so that automatic control without electric elements is realized.

Drawings

The objects and advantages of the present invention will be understood by the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural diagram of a plurality of groups of hydraulic supports in a support system for realizing air-water linkage spraying according to a specific embodiment of the invention;

FIG. 2 is a schematic structural diagram of a group of hydraulic supports in an embodiment of the support system for realizing air-water linkage spraying according to the present invention;

FIG. 3 is a schematic structural diagram of a first air-water control valve in a support system for realizing air-water linkage spraying according to an embodiment of the invention;

fig. 4 is a schematic structural diagram of a second air-water control valve in the support system for realizing air-water linkage spraying according to the invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 and 2, the support system (hereinafter referred to as support system) for realizing gas-water linkage spraying provided by the invention is used for spraying a gas-water mixture to top coal of a fully mechanized mining face, a coal mining machine roller and crushed coal in a chute below the coal mining machine roller so as to inhibit generation of dust when the coal mining machine roller cuts coal and falls to a column for moving a frame.

This support system includes: the hydraulic support 10 is used for carrying out hydraulic support to the combined mining working face and install atomizer 20 on hydraulic support 10, atomizer 20 includes: a spray head 21 arranged on the lower side of the top supporting guard plate 11 of the hydraulic bracket 10, and an air water control valve 22 for controlling the opening or closing of the spray head 21; wherein the spray head 21 comprises a gas interface and a liquid interface; the air-water control valve 22 comprises a first port a communicated with a pressure air source, a second port b communicated with a water source, a third port c communicated with an air port of the spray head 21 and a fourth port d communicated with a liquid port of the spray head 21; the air water control valve 22 is linked with a hydraulic support system of the hydraulic support 10, and controls the spray head 21 to spray in one or more states of the hydraulic support 10 falling column, the hydraulic support 10 folding and side protecting plate and the hydraulic support 10 moving frame.

In the support system, the spray head 21 is provided with the gas interface and the liquid interface to realize high-pressure spraying after gas-liquid mixing, so that effective dust suppression at a high range can be realized, water consumption is saved, and the problem that the quality of coal output is influenced by excessive water is avoided; meanwhile, the spray of the spray head 21 can be linked with the actions of withdrawing, descending, moving and the like of a side protection plate of a hydraulic support system through the air water control valve 22, so that the automatic control without electric elements is realized.

Specifically, the hydraulic brackets 10 are arranged in a plurality of groups, and the spraying device 20 is arranged in each group of hydraulic brackets 10 to maintain the spraying amount of the hydraulic brackets 10. The hydraulic support system of the hydraulic support 10 adopts a hydraulic system powered by an emulsion pump to realize that the working pressure is kept at 30-50 Mpa.

Specifically, the spray head 21 includes a first spray head 21A and a second spray head 21B, the spray direction of the first spray head 21A faces the front end of the top plate of the adjacent hydraulic support 10 in the traveling direction of the coal mining machine, and the first spray head 21A is used for performing spray treatment on the front end of the top plate of the adjacent hydraulic support 10 in the processes of lowering and moving the hydraulic support 10. The spraying direction of the second spray head 21B faces the lower edge of the roller of the coal mining machine, and the second spray head 21B is used for spraying downwards to the edge of the roller and the chute below the roller when the hydraulic support 10 collects the side protection plate.

The air-water control valves 22 include a first air-water control valve 22A and a second air-water control valve 22B, the first air-water control valve 22A is used to control the first nozzles 21A, and the second air-water control valve 22B is used to control the second nozzles 21B. The specific structure of the first and second air-water control valves 22A and 22B will be described in detail below.

As shown in fig. 3, the first air-water control valve 22A includes a first control port e and a second control port f, and the first control port e is communicated with the control cylinder of the lifting column of the hydraulic bracket 10; and the second control port f is communicated with a moving frame control oil cylinder of the hydraulic support 10.

More specifically, the first control port e communicates with a column control port of a column control cylinder of the hydraulic support 10. When the emulsion enters a column lowering control cavity of a column lifting control cylinder of the hydraulic support 10, the emulsion simultaneously enters the first air-water control valve 22A through the first control port e while controlling the hydraulic support 10 to lower the column, the emulsion drives a valve core of the first air-water control valve 22A to move, so that the first port a is communicated with the third port c, the second port b is communicated with the fourth port d, and finally the first spray head 21A is controlled to spray.

More specifically, the second control port f is communicated with a frame moving control port of a frame moving control oil cylinder of the hydraulic support 10. When the emulsion enters the rack moving control cavity of the rack moving control oil cylinder of the hydraulic support 10, the emulsion enters the first air-water control valve 22A through the second control port f while controlling the hydraulic support 10 to move, and controls the valve core to move, so that the first port a is communicated with the third port c, the second port B is communicated with the fourth port d, and finally the second nozzle 21B is controlled to spray.

The spool of the first gas water control valve 22A includes a first spool 22A1, a second spool 22A2, and a third spool 22A3 arranged in sequence in a first direction; a first resetting piece 22A4 is arranged between the first valve core 22A1 and the end part of the valve cavity of the first gas water control valve 22A, and a second resetting piece 22A5 is arranged between the third valve core 22A3 and the end part of the valve cavity of the first gas water control valve 22A; in the initial position, under the action of the first resetting piece 22A4, the first port a and the third port c of the first air water control valve 22A are not communicated; under the action of the second resetting piece 22A5, the second port b and the fourth port d of the first air-water control valve 22A are not communicated; the area between the first spool 22A1 and the second spool 22A2 provides the first control port e, and the area between the second spool 22A2 and the third spool 22A3 provides the second control port f; after the pressure liquid enters the first control port e or the second control port f, the first port a of the first air-water control valve 22A is communicated with the third port c, and the second port b of the first air-water control valve 22A is communicated with the fourth port d.

More specifically, a first block valve sleeve 22A6 is arranged in the valve cavity of the first air water control valve 22A, and the first valve core 22A1 is slidably connected to the inner side of the first block valve sleeve 22A 6; a first annular outer edge is arranged on the first valve core 22A1, and a first annular shoulder matched with the first annular outer edge is arranged in the first obstruction valve sleeve 22A 6; the first interface a and the third interface c are respectively positioned on two sides of the matching surface of the first annular outer edge and the first annular shoulder. In an initial state, when the first annular outer edge of the first valve spool 22A1 abuts against the first annular land inside the first blocking valve sleeve 22A6 under the action of the first reset piece 22A4, the first port a is isolated from the third port c, and when the first control port e is filled with pressure fluid and the pressure fluid pushes the first valve spool 22A1 to move against the elastic force of the first reset piece 22A4, the first annular outer edge of the first valve spool 22A1 forms a gap with the first annular land inside the first blocking valve sleeve 22A6, so that the first port a is communicated with the third port c, and pressure gas can enter the spray head 21 through the first gas water control valve 22A.

More specifically, a second obstruction valve sleeve 22A7 is arranged in the valve cavity of the first air-water control valve 22A, and the third valve core 22A3 is slidably connected to the inner side of the second obstruction valve sleeve 22A 7; a second annular outer edge is arranged on the third valve element 22A3, and a second annular shoulder matched with the second annular outer edge is arranged inside the second blocking valve sleeve 22A 7; the second port b and the fourth port d are respectively positioned on two sides of the matching surface of the second annular outer edge and the second annular shoulder. In an initial state, when the second annular outer edge of the third valve core 22A3 abuts against the second annular shoulder inside the second blocking valve sleeve 22A7 under the action of the second resetting member 22A5, the second port b is isolated from the fourth port d, and when the pressure fluid enters the second control port f and pushes the third valve core 22A3 to move against the elastic force of the second resetting member 22A5, the second annular outer edge of the third valve core 22A3 forms a gap with the second annular shoulder inside the third blocking valve sleeve, so that the second port b is communicated with the fourth port d, and the injection water can enter the spray head 21 through the first air water control valve 22A.

More specifically, the second spool 22a2 is slidably connected to the valve cavity, and the second spool 22a2 can move toward the third spool 22A3 and push the third spool 22A3 to move under the action of the emulsion of the first control port e, or the second spool 22a2 can move toward the first spool 22a1 and push the first spool 22a1 to move under the action of the emulsion of the second control port f, so that the pressurized air and the pressurized water can simultaneously enter the spray head 21 during the column lowering and the rack moving of the hydraulic rack 10, and the high-pressure spray is realized.

Specifically, a first plug assembly is arranged at the end of the valve cavity of the first air-water control valve 22A, and the first plug assembly comprises: a first valve sleeve 22A8 with two open ends, which is screwed on the valve body of the first gas water control valve 22A, and the first valve core 22A1 is arranged in the first valve sleeve 22 A8; a first plug 22A9 threadedly connected to the end of the first valve housing 22A8 for plugging the valve chamber of the first gas water control valve 22A; and a third reset piece 22a10, the third reset piece 22a10 being located between the first valve spool 22a1 and the first plug 22a9, the resilience of the third reset piece 22a10 abutting the first valve spool 22a1 against a land of the first valve housing 22 A8. Specifically, the first valve spool 22a1 includes a third annular outer rim and the first valve sleeve 22A8 defines a third annular land. In the initial state, the third annular outer edge abuts against the third annular land, and when the first control port e or the second control port f enters pressure fluid, the pressure fluid overcomes the acting force of the first reset piece 22a4 and the third reset piece 22a10 at the same time to move the first valve spool 22a 1.

More specifically, a partial area of the first valve housing 22A8 is located inside the valve body of the first air water control valve 22A and a partial area is located outside the valve body of the first air water control valve 22A. The middle part of the valve body is provided with external threads for realizing threaded connection with an internal threaded hole at the end part of the valve body of the first gas water control valve 22A, and the end part of the first valve sleeve 22A8 positioned at the inner side of the valve body is abutted against the end part of the first blocking valve sleeve 22A 6. The first valve sleeve 22A8 is provided with a through hole communicated with the first port a, and the first blocking valve sleeve 22a6 is provided with a through hole communicated with the third port c.

A second plug assembly is arranged at the end part of the valve cavity of the first air water control valve 22A, and the second plug assembly is arranged at the third valve core 22A3 side of the first air water control valve 22A. The second plug assembly has the same structure as the first plug 22a9 assembly, and includes: a second valve sleeve 22A11 with two open ends, which is screwed on the valve body of the first air water control valve 22A, and the second valve core 22A2 is arranged in the second valve sleeve 22A 11; a second plug 22A12 threadably connected to the end of the second valve housing 22A 11; and a fourth reset piece 22a13, the fourth reset piece 22a13 is located between the third valve element 22A3 and the second plug 22a12, and the elastic force of the fourth reset piece 22a13 abuts the third valve element 22A3 against a shoulder of the second valve sleeve 22a 11. Specifically, the third spool 22A3 includes a fourth annular outer edge and the second sleeve 22A11 defines a fourth annular shoulder. In the initial state, the fourth annular outer edge abuts against the fourth annular shoulder, and when the first control port e or the second control port f enters pressure fluid, the pressure fluid overcomes the acting forces of the second resetting piece 22a5 and the fourth resetting piece 22a13 to move the third valve element 22 A3.

More specifically, a partial area of the second valve housing 22A11 is located inside the valve body of the first air water control valve 22A, and a partial area is located outside the valve body of the first air water control valve 22A. The middle part of the valve body is provided with external threads for realizing threaded connection with an internal threaded hole at the end part of the valve body of the first gas water control valve 22A, and the end part of the second valve sleeve 22A11 positioned at the inner side of the valve body is abutted against the end part of the second blocking valve sleeve 22A 7. The second valve housing 22a11 is provided with a through hole communicated with the second port b, and the second blocking valve housing 22a7 is provided with a through hole communicated with the fourth port d.

By providing the first plug 22a9 or the second plug 22a12, the first valve housing 22A8 and the second valve housing 22a11 are partially located outside the valve body, and are detachably mounted on the valve body through a threaded connection, so that the valve core of the valve body can be easily repaired, and the sizes of the third restoring member 22a10 and the fourth restoring member 22a13 can be adjusted to adapt to the working pressures of different hydraulic systems.

As shown in fig. 4, the second air-water control valve 22B includes a third control port g, and the third control port g is communicated with the upper protection plate control cylinder of the hydraulic support 10; when the hydraulic support 10 is used for retracting the side protection plate, the third control port g enters pressure liquid and drives the valve core of the second air-water control valve 22B to move, so that the first port a is communicated with the third port c, and the second port B is communicated with the fourth port d.

More specifically, the spool of the second air-water control valve 22B includes a fourth spool 22B1 and a fifth spool 22B2 that are sequentially arranged in the first direction;

a fifth reset piece 22B3 is arranged between the fourth valve spool 22B1 and the end part of the valve cavity of the second air-water control valve 22B, and a sixth reset piece 22B4 is arranged between the fifth valve spool 22B2 and the end part of the valve cavity of the second air-water control valve 22B; in the initial position, under the action of the fifth resetting piece 22B3, the first port a and the third port c of the second air-water control valve 22B are not communicated; under the action of the sixth resetting piece 22B4, the second port B and the fourth port d of the second air-water control valve 22B are not communicated; the third control port g is provided in a region between the fourth valve spool 22B1 and the fifth valve spool 22B2, and when pressure fluid enters the third control port g, the first port a and the third port c of the second air-water control valve 22B are communicated, and the second port B and the fourth port d of the second air-water control valve 22B are communicated.

More specifically, a third obstruction valve sleeve 22B5 and a fourth obstruction valve sleeve 22B6 are arranged in the valve cavity of the second air-water control valve 22B; the fourth spool 22B1 is slidably connected to the inside of the third block valve sleeve 22B 5; the fourth spool 22B1 is slidably connected to the inside of the third block valve sleeve 22B 5; a fifth annular outer edge is arranged on the fourth valve core 22B1, and a fifth annular shoulder matched with the fifth annular outer edge is arranged inside the third obstruction valve sleeve 22B 5; the first interface a and the third interface c are respectively positioned on two sides of the matching surface of the fifth annular outer edge and the fifth annular shoulder. A sixth annular outer edge is arranged on the fifth valve core 22B2, and a sixth annular shoulder matched with the sixth annular outer edge is arranged in the fourth obstruction valve sleeve 22B 6; the second port b and the fourth port d are respectively positioned on two sides of the matching surface of the sixth annular outer edge and the sixth annular shoulder.

In the initial state, when the fifth annular outer rim of the fourth valve spool 22B1 abuts against the fifth annular land inside the third barrier valve sleeve 22B5 under the action of the fifth reset piece 22B3 and the sixth annular outer rim of the fifth valve spool 22B2 abuts against the sixth annular land inside the fourth barrier valve sleeve 22B6 under the action of the sixth reset piece 22B4, the first port a is isolated from the third port c; when the pressure fluid overcomes the elastic force of the fifth reset piece 22B3 to push the fourth valve spool 22B1 to move after the pressure fluid enters the third control port g, a gap is formed between the fifth annular outer edge of the fourth valve spool 22B1 and the fifth annular shoulder inside the third block valve sleeve 22B5, a gap is formed between the sixth annular outer edge of the fifth valve spool 22B2 and the sixth annular shoulder inside the fourth block valve sleeve 22B6, so that the first port a is communicated with the third port c, the second port B is communicated with the fourth port d, and the pressure gas and the pressure fluid can enter the spray head 21 through the first gas water control valve 22A.

Specifically, a third plug assembly is arranged at the end of the valve cavity of the second air-water control valve 22B, and the third plug assembly comprises: a third valve sleeve 22B7 with two open ends, which is screwed on the valve body of the second air-water control valve 22B, and the fourth valve core 22B1 is arranged in the third valve sleeve 22B 7; a third plug 22B8 threadably connected to an end of the third sleeve 22B 7; and a seventh reset piece 22B9, the seventh reset piece 22B9 being located between the fourth spool 22B1 and the third plug 22B8, the spring force of the seventh reset piece 22B9 urging the fourth spool 22B1 against the land of the third sleeve 22B 7. Specifically, the fourth spool 22B1 includes a seventh annular outer rim, and the third sleeve 22B7 defines a seventh annular land. In the initial state, the seventh annular outer edge abuts against the seventh annular land, and when the third control port g receives pressure fluid, the pressure fluid overcomes the acting forces of the fifth reset piece 22B3 and the seventh reset piece 22B9 at the same time to move the fourth valve spool 22B 1.

More specifically, a partial area of the third valve sleeve 22B7 is located inside the valve body of the second pneumatic control valve 22B, and a partial area is located outside the valve body of the second pneumatic control valve 22B. The middle part of the valve body is provided with external threads for realizing threaded connection with an internal threaded hole at the end part of the valve body of the second air-water control valve 22B, and the end part of the third valve sleeve 22B7 positioned at the inner side of the valve body is abutted against the end part of the third obstruction valve sleeve 22B 5. The third valve sleeve 22B7 is provided with a through hole communicated with the first port a, and the third blocking valve sleeve 22B5 is provided with a through hole communicated with the third port c.

A fourth plug assembly is arranged at the end of the valve cavity of the second air-water control valve 22B, and the fourth plug assembly is arranged at the fifth valve core 22B2 side of the second air-water control valve 22B. The fourth plug assembly comprises: a fourth valve sleeve 22B10 with openings at two ends, which is screwed on the valve body of the second air-water control valve 22B, and the fifth valve core 22B2 is arranged in the fourth valve sleeve 22B10 in a penetrating manner; a fourth plug 22B11 threadably connected to the end of the fourth valve housing 22B 10; an eighth reset member 22B12, the eighth reset member 22B12 being located between the fifth valve spool 22B2 and the fourth plug 22B11, the spring force of the eighth reset member 22B12 urging the fifth valve spool 22B2 against the land of the fourth valve housing 22B 10. Specifically, the fifth valve spool 22B2 includes an eighth annular outer rim and the fourth valve sleeve 22B10 defines an eighth annular land. In the initial state, the eighth annular outer edge abuts against the eighth annular land, and when the third control port g receives pressure fluid, the pressure fluid overcomes the acting forces of the sixth reset piece 22B4 and the eighth reset piece 22B12 at the same time to move the fourth valve spool 22B 1.

More specifically, a partial area of the fourth valve sleeve 22B10 is located inside the valve body of the second air control valve 22B, and a partial area is located outside the valve body of the second air control valve 22B. The middle part of the valve body is provided with external threads for realizing threaded connection with an internal threaded hole at the end part of the valve body of the second air-water control valve 22B, and the end part of the fourth valve sleeve 22B10 positioned at the inner side of the valve body is abutted against the end part of the fourth obstruction valve sleeve 22B 6. The fourth valve sleeve 22B10 is provided with a through hole communicated with the second port B, and the fourth block valve sleeve 22B6 is provided with a through hole communicated with the fourth port d.

When the fully mechanized face is normally produced, along the traveling direction of the coal mining machine (for example, the 12# bracket advances to the 1# bracket in fig. 1), the coal mining machine travels until the front roller is positioned on the 1# bracket side and the rear roller is positioned on the 11# bracket side, at this time, the side protection plate of the adjacent hydraulic bracket 10 (the position of the 1# to 11# bracket) is retracted, and the side protection plate of the 12# bracket extends; at this time, the second air water control valves 22B on the No. 1# -11# supports control the second spray heads 21B to spray downwards, the second air water control valves 22B on the No. 12# supports control the second spray heads 21B to close, and as the shearer moves forwards, the second spray heads 21B on the corresponding supports at the front rollers are sequentially opened, and the second spray heads 21B on the corresponding supports at the rear sides of the rear rollers are sequentially closed. More specifically, when the side guard of the hydraulic support 10 is retracted, after the third control port g of the second air-water control valve 22B enters the pressure liquid, the fifth valve spool 22B2 and the sixth valve spool are controlled to move in a direction away from the third control port g, so that the first port a and the third port c of the second air-water control valve 22B are communicated, the second port B and the fourth port d are communicated, and the high-pressure air and the water simultaneously enter the second spray head 21B, so that the spray of the second spray head 21B is realized; when the side protection plate of the hydraulic bracket 10 is opened, after the third control port g of the second air-water control valve 22B loses pressure, under the action of the fifth reset piece 22B3 and the seventh reset piece 22B9, the fifth valve core 22B2 moves towards the direction approaching to the third control port g, and the first port a is not communicated with the third port c; under the action of the sixth reset piece 22B4 and the eighth reset piece 22B12, the sixth valve spool moves toward the third control port g, and the second port B is not communicated with the fourth port d.

When the front roller of the coal mining machine finishes top cutting, a bracket (6# bracket) at the middle position of the coal mining machine generally starts to descend and move, at the moment, the 12# bracket to 7# bracket finishes the action of descending and moving the bracket, the 6# bracket to 1# bracket does not move forwards, when the 6# bracket descends and moves the bracket, a first spray head 21A on the bracket is automatically opened and sprays towards the top coal (rock) exposed in front of the top of the 5# bracket, and when the 6# bracket finishes the action of descending and moving the bracket, the first spray head 21A on the bracket is automatically closed.

When the hydraulic support 10 descends, high-pressure emulsion enters the first air-water control valve 22A through the first control port e, the first valve spool 22A1 and the second valve spool 22A2 are respectively pushed to move in the direction away from the first control port e, the second valve spool 22A2 finally acts on the third valve spool 22A3, the first port a and the third port c of the first air-water control valve 22A are communicated, the second port b and the fourth port d are communicated, high-pressure air and water simultaneously enter the first spray head 21A, and the spraying of the first spray head 21A is realized; after the hydraulic bracket 10 finishes column descending, after the first control port e of the first air water control valve 22A loses pressure, under the action of the first resetting piece 22A4 and the third resetting piece 22A10, the first valve spool 22A1 moves towards the direction close to the first control port e, and the first port a is not communicated with the third port c; under the action of the second reset piece 22a5 and the fourth reset piece 22a13, the third valve spool 22A3 moves toward the first control port e, and the second port b is not communicated with the fourth port d.

When the hydraulic support 10 moves, high-pressure emulsion enters the first air-water control valve 22A through the second control port f, the third valve core 22A3 and the second valve core 22A2 are respectively pushed to move in the direction away from the first control port e, the second valve core 22A2 finally acts on the first valve core 22A1, the first port a and the third port c of the first air-water control valve 22A are communicated, the second port b and the fourth port d are communicated, high-pressure air and water simultaneously enter the first spray head 21A, and the spraying of the first spray head 21A is realized; after the hydraulic bracket 10 finishes column descending, after the first control port e of the first air water control valve 22A loses pressure, under the action of the first resetting piece 22A4 and the third resetting piece 22A10, the first valve spool 22A1 moves towards the direction close to the first control port e, and the first port a is not communicated with the third port c; under the action of the second reset piece 22a5 and the fourth reset piece 22a13, the third valve spool 22A3 moves toward the first control port e, and the second port b is not communicated with the fourth port d.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.