Fireproof grouting device for coal mine

Abstract

The utility model relates to the field of coal mine fire prevention and discloses a coal mine fireproof grouting device which comprises a grouting nozzle, a circular groove is formed in the position, close to the inner wall face of the top, of the grouting nozzle, a circular liquid supply pipe is fixedly installed in the circular groove, and a plurality of L-shaped nozzles are installed on the inner wall face of the circular liquid supply pipe in a circumferential array mode. A connecting pipe is fixedly mounted on the outer surface of the circular liquid supply pipe, and after the grouting spray head is used, a worker connects the connecting pipe with an external liquid supply water pipe, so that external pressurized water is guided into the circular liquid supply pipe and sprayed out through the L-shaped spray heads to wash the inner wall of the grouting spray head; the slurry is prevented from being attached to the inner wall of the grouting nozzle to affect subsequent use as much as possible, and meanwhile, due to the fact that the polytetrafluoroethylene coating is arranged on the inner wall face of the grouting nozzle, adhesion and accumulation of the slurry on the inner wall of the grouting nozzle can be reduced, so that the slurry smoothly slides downwards without blocking the grouting nozzle.

Description

Technical Field

[0001] The present application belongs to the technical field of coal mine fire prevention, and specifically relates to a coal mine fire prevention grouting device. Background Art

[0002] Coal mine fire prevention grouting is a technical measure that uses slurry to fill the pores and cracks in the coal seam or goaf to form a fire barrier and prevent or delay the spread of fire. Fire prevention grouting is determined according to the specific conditions of the fire hazard area and the grouting method. Common grouting methods include: drilling grouting, crack grouting, surface penetration grouting and segmented grouting. When performing crack grouting, because the cracks in the coal seam or goaf are narrow, it is necessary to use a nozzle to spray the slurry into the cracks to ensure that the slurry can fill the entire space of the cracks.

[0003] For example, the utility model patent with announcement number CN220415437U discloses a coal mine fire prevention grouting device, comprising a nozzle body, a nozzle fixedly connected to the bottom end of the nozzle body, a ball seat is provided in the middle of the nozzle body, a spray ring is provided on the upper part of the nozzle body, a driving box is provided on one side of the nozzle body, a water supply pipe is provided on the outer side of the spray ring, a water outlet pipe is provided on the inner side of the spray ring, a ball valve is rotatably connected in the ball seat, a rotating shaft is fixedly connected on one side of the ball valve, a motor is provided on one side of the driving box, a driving rod is rotatably connected in the driving box, a bevel gear is fixedly connected to the driving rod and the rotating shaft, a moving block is threadedly connected to the driving rod, a connecting rod is fixedly connected to one side of the moving block, and a cleaning ring is fixedly connected to the end of the connecting rod. The advantage of the utility model is that the transmission components are all located in the driving box, and no slurry will stick to the transmission components during grouting work.

[0004] However, it was found in actual use that: the device achieves the effect of cleaning the inner wall of the nozzle body by spraying water through the water outlet pipe and moving the cleaning ring up and down, but the multiple water outlet pipes of the device are symmetrically installed so that the water sprayed can only flow downward along the inner wall of the main body, so that the water sprayed by the water outlet pipe has a poor effect of cleaning the inner wall of the nozzle body;

[0005] At the same time, the device is (attached Figure 1 (as shown in the figure) a rectangular groove is provided on the inner wall of the nozzle body so that a connecting rod can drive a cleaning ring to move up and down to clean the inner wall of the nozzle body. However, when slurry (such as flame retardant, cement slurry and expansion agent) enters the interior of the nozzle body, it will invade the interior of the drive box through the rectangular groove and affect the internal structure, making it impossible for the device as a whole to maintain normal operation. Therefore, a coal mine fire prevention grouting device is provided. Utility Model Content

[0006] The purpose of this application is to provide a coal mine fire prevention grouting device in order to solve the above-mentioned problems.

[0007] The technical solution adopted in the present application is as follows: A coal mine fire prevention grouting device comprises a grouting nozzle, wherein the grouting nozzle is provided with a circular groove near the top inner wall surface, a circular liquid supply pipe is fixedly installed inside the circular groove, a plurality of L-shaped nozzles are installed in a circular array on the inner wall surface of the circular liquid supply pipe, a connecting pipe is fixedly installed on the outer surface of the circular liquid supply pipe, one end of the connecting pipe extends to the outside of the grouting nozzle, a polytetrafluoroethylene coating is provided on the inner side wall of the grouting nozzle, a connecting end is provided on the top surface of the grouting nozzle, a grouting pipe is fixedly installed on the top of the connecting end, and the end of the grouting pipe away from the connecting end is connected to an external slurry supply pipe.

[0008] In a preferred embodiment, a circular protrusion is fixedly installed on the top surface of the grouting nozzle, and four limit plates are installed in a circular array on the outer surface of the circular protrusion, and a circular groove corresponding to the circular protrusion is provided on the bottom surface of the connecting end head, and a plurality of limit grooves corresponding to the limit plates are provided in a circular array on the inner wall surface of the circular groove, and the circular protrusion is inserted into the inside of the circular groove, and a socket is respectively provided on one side of the circular protrusion and the limit plate, and a fixing column corresponding to the socket is pierced on the outer surface of the connecting end head, and one end of the fixing column is inserted into the inside of the socket.

[0009] In a preferred embodiment, a conical retaining ring is fixedly installed inside the circular liquid supply pipe near the top.

[0010] In a preferred embodiment, a circular magnetic ring is fixedly mounted on one end of the fixing column, the circular magnetic ring is attracted to an iron sheet installed inside the socket, and a circular iron sheet is fixedly mounted on one end of the fixing column away from the circular magnetic ring.

[0011] In a preferred embodiment, a sealing ring is fixedly mounted on the top surface of the grouting nozzle, and the sealing ring is located between the grouting nozzle and the connecting end.

[0012] In a preferred embodiment, a valve is provided on the outer surface of the grouting pipe.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are:

[0014] 1. In the present application, due to the adoption of the above-mentioned scheme, the slurry enters the interior of the grouting nozzle through the grouting pipe and the connecting end, thereby facilitating the grouting operation on the coal mine cracks. When the grouting nozzle is used up, the personnel connects the connecting pipe to the external liquid supply pipe, so that the pressurized water from the outside is introduced into the interior of the circular liquid supply pipe and sprayed through a plurality of L-shaped nozzles to flush the inner wall of the grouting nozzle, so as to avoid the slurry adhering to the inner wall of the grouting nozzle and affecting the subsequent use as much as possible. At the same time, since the inner wall surface of the grouting nozzle is provided with a polytetrafluoroethylene coating, the adhesion and accumulation of the slurry on the inner wall of the grouting nozzle can be reduced, thereby promoting the slurry to slide down smoothly without clogging the grouting nozzle. The device uses a plurality of L-shaped nozzles so that the sprayed high-pressure liquid can effectively flush out the slurry attached to the inner wall of the grouting nozzle, so as to avoid clogging and affecting the subsequent use as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of this application;

[0016] Figure 2 This is a schematic diagram of the internal structure of the grouting nozzle of this application;

[0017] Figure 3 For this application Figure 2 The enlarged structural diagram at A in the middle;

[0018] Figure 4 This is a schematic diagram of the circular liquid supply pipe of the present application before installation;

[0019] Figure 5 This is a schematic diagram of the structure of the connection end of the present application when viewed from above.

[0020] Markings in the figure: 1. Grouting nozzle; 2. Circular groove; 3. Circular liquid supply pipe; 4. L-shaped nozzle; 5. Connecting pipe; 6. Connecting end; 7. Grouting pipeline; 8. Circular protrusion; 9. Limiting plate; 10. Circular groove; 11. Limiting groove; 12. Socket; 13. Fixed column; 14. Conical retaining ring; 15. Circular magnetic ring; 16. Circular iron sheet; 17. Sealing ring; 18. Valve. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] refer to Figure 1-Figure 5A coal mine fire prevention grouting device comprises a grouting nozzle 1, a circular groove 2 is provided on the inner wall surface near the top of the grouting nozzle 1, a circular liquid supply pipe 3 is fixedly installed inside the circular groove 2, a plurality of L-shaped nozzles 4 are installed on the inner wall surface of the circular liquid supply pipe 3 in a circular array, and a conical retaining ring 14 is fixedly installed inside the circular liquid supply pipe 3 near the top; the circular groove 2 is provided to facilitate the installation of the circular liquid supply pipe 3, the circular liquid supply pipe 3 is provided to facilitate the installation of a plurality of L-shaped nozzles 4, and the conical retaining ring 14 is provided to facilitate the protection of the L-shaped nozzle 4, so as to avoid the influence of slurry (such as flame retardant, cement slurry and expansion agent) on the L-shaped nozzle 4 as much as possible.

[0023] refer to Figure 1 , Figure 2 and Figure 3 A connecting pipe 5 is fixedly installed on the outer surface of the circular liquid supply pipe 3, one end of the connecting pipe 5 extends to the outside of the grouting nozzle 1, and the inner wall of the grouting nozzle 1 is provided with a polytetrafluoroethylene coating; through the provided connecting pipe 5, it is convenient to introduce the pressurized water from the outside into the interior of the circular liquid supply pipe 3 and spray it through a plurality of L-shaped nozzles 4 to rinse the inner wall of the grouting nozzle 1, so as to avoid the slurry adhering to the inner wall of the grouting nozzle 1 and affecting the subsequent use as much as possible. The polytetrafluoroethylene coating is a non-stick coating, which has good chemical resistance and low viscosity, and can reduce the adhesion and accumulation of the slurry on the inner wall of the grouting nozzle 1, thereby promoting the slurry to slide down smoothly without clogging the grouting nozzle 1.

[0024] refer to Figure 1 , Figure 2 and 4 A connecting end 6 is provided on the top surface of the grouting nozzle 1, and a sealing ring 17 is fixedly installed on the top surface of the grouting nozzle 1. The sealing ring 17 is located between the grouting nozzle 1 and the connecting end 6. A grouting pipe 7 is fixedly installed on the top of the connecting end 6. The end of the grouting pipe 7 away from the connecting end 6 is connected to an external slurry feed pipe, and a valve 18 is provided on the outer surface of the grouting pipe 7; through the connecting end 6 and the grouting pipe 7, it is convenient for external slurry to enter the interior of the grouting nozzle 1, and it is convenient to perform grouting operations on coal mine cracks. Through the sealing ring 17, it is convenient to improve the sealing between the grouting nozzle 1 and the connecting end 6. Through the valve 18, it is convenient to control the amount of slurry entering the grouting pipe 7.

[0025] refer to Figure 2 , Figure 3 and Figure 5A circular protrusion 8 is fixedly installed on the top surface of the grouting nozzle 1, and four limit plates 9 are installed on the outer surface of the circular protrusion 8 in a circular array. A circular groove 10 corresponding to the circular protrusion 8 is opened on the bottom surface of the connecting end 6, and a plurality of limit grooves 11 corresponding to the limit plates 9 are opened on the inner wall surface of the circular groove 10 in a circular array, and the circular protrusion 8 is inserted into the inside of the circular groove 10; the circular protrusion 8 and the limit plate 9 are arranged to facilitate the connection between the grouting nozzle 1 and the connecting end 6, so as to facilitate the subsequent grouting operation on the coal mine cracks.

[0026] refer to Figure 1 , Figure 2 and Figure 3 , a socket 12 is respectively provided on one side of the circular protrusion 8 and the limiting plate 9, and a fixing column 13 corresponding to the socket 12 is pierced on the outer surface of the connecting terminal 6, and one end of the fixing column 13 is inserted into the inside of the socket 12, and a circular magnetic ring 15 is fixedly installed on one end of the fixing column 13, and the circular magnetic ring 15 is adsorbed with the iron sheet installed inside the socket 12, and a circular iron sheet 16 is fixedly installed on the end of the fixing column 13 away from the circular magnetic ring 15; the circular magnetic ring 15 is adsorbed with the iron sheet installed inside the socket 12, so that the fixing column 13 can limit and fix the connected grouting nozzle 1 and the connecting terminal 6, thereby improving the stability between the grouting nozzle 1 and the connecting terminal 6, and the circular iron sheet 16 is arranged, so that personnel can use the magnetic block to adsorb it to pull out the fixing column 13, so that personnel can disassemble the grouting nozzle 1 and the connecting terminal 6, and maintain or replace the grouting nozzle 1.

[0027] The implementation principle of an embodiment of a coal mine fire prevention grouting device in the present application is as follows: external slurry enters the interior of the grouting nozzle 1 through the grouting pipe 7 and the connecting end 6, thereby facilitating grouting operations on coal mine cracks. When the grouting nozzle 1 is used up, the personnel connects the connecting pipe 5 to the external liquid supply pipe, so that the external pressurized water is introduced into the interior of the circular liquid supply pipe 3 and sprayed through a plurality of L-shaped nozzles 4 to rinse the inner wall of the grouting nozzle 1, so as to avoid the slurry adhering to the inner wall of the grouting nozzle 1 and affecting the subsequent use as much as possible. At the same time, since the inner wall surface of the grouting nozzle 1 is provided with a polytetrafluoroethylene coating, the adhesion and accumulation of the slurry on the inner wall of the grouting nozzle 1 can be reduced, thereby promoting the slurry to slide down smoothly without clogging the grouting nozzle 1. The device has a simple structure and is easy to operate. Through a plurality of L-shaped nozzles 4, the sprayed high-pressure liquid can effectively flush out the slurry attached to the inner wall of the grouting nozzle 1, so as to avoid clogging and affecting the subsequent use as much as possible.

[0028] The circular protrusion 8 and the limit plate 9 are respectively inserted into the circular groove 10 and the limit groove 11 and fixed by the fixing column 13, so that it is convenient to connect the grouting nozzle 1 with the connecting end 6, and it is convenient for the subsequent grouting operation of the coal mine cracks. When the personnel maintain or replace the grouting nozzle 1, they first use the magnetic block and the circular iron sheet 16 to adsorb and pull the fixing column 13 outward, so that the circular magnetic ring 15 is separated from the iron sheet, and the fixed connection state of the grouting nozzle 1 and the connecting end 6 can be released, thereby facilitating the personnel to disassemble, maintain or replace the grouting nozzle 1, thereby improving convenience.

[0029] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal mine fire prevention grouting device, comprising a grouting nozzle (1), characterized in that: The grouting nozzle (1) is provided with a circular groove (2) near the inner wall surface of the top, a circular liquid supply pipe (3) is fixedly installed inside the circular groove (2), a plurality of L-shaped nozzles (4) are installed in a circular array on the inner wall surface of the circular liquid supply pipe (3), a connecting pipe (5) is fixedly installed on the outer surface of the circular liquid supply pipe (3), one end of the connecting pipe (5) extends to the outside of the grouting nozzle (1), the inner side wall of the grouting nozzle (1) is provided with a polytetrafluoroethylene coating, the top surface of the grouting nozzle (1) is provided with a connecting end (6), a grouting pipe (7) is fixedly installed at the top end of the connecting end (6), and the end of the grouting pipe (7) away from the connecting end (6) is connected to an external slurry supply pipe.

2. A coal mine fireproof grouting device as claimed in claim 1, characterized in that: A circular protrusion (8) is fixedly mounted on the top surface of the grouting nozzle (1), and four limiting plates (9) are mounted on the outer surface of the circular protrusion (8) in a circular array. A circular groove (10) corresponding to the circular protrusion (8) is provided on the bottom surface of the connecting end (6), and a plurality of limiting grooves (11) corresponding to the limiting plates (9) are provided on the inner wall surface of the circular groove (10) in a circular array. The circular protrusion (8) is inserted into the inside of the circular groove (10), and a plug hole (12) is respectively provided on one side of the circular protrusion (8) and the limiting plate (9). A fixing column (13) corresponding to the plug hole (12) is penetrated through the outer surface of the connecting end (6), and one end of the fixing column (13) is inserted into the inside of the plug hole (12).

3. A coal mine fireproof grouting device as claimed in claim 1, characterized in that: A conical material retaining ring (14) is fixedly installed inside the circular liquid supply pipe (3) near the top.

4. A coal mine fireproof grouting device as claimed in claim 2, characterized in that: A circular magnetic ring (15) is fixedly mounted on one end of the fixing column (13), the circular magnetic ring (15) is attracted to an iron sheet installed inside the jack (12), and a circular iron sheet (16) is fixedly mounted on one end of the fixing column (13) away from the circular magnetic ring (15).

5. A coal mine fireproof grouting device as claimed in claim 1, characterized in that: A sealing ring (17) is fixedly mounted on the top surface of the grouting nozzle (1), and the sealing ring (17) is located between the grouting nozzle (1) and the connecting end (6).

6. A coal mine fireproof grouting device as claimed in claim 1, characterized in that: The outer surface of the grouting pipe (7) is provided with a valve (18).

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