Fire retardant spraying system for coal mine goaf

Abstract

The invention discloses a coal mine goaf fireproof inhibitor spraying system which comprises a mixing tank, an inhibitor pump and a spraying mechanism, the mixing tank and the inhibitor pump are communicated through a conveying pipeline, the inhibitor pump and the spraying mechanism are communicated through a conveying pipeline, the mixing tank comprises an outer shell, and the top of the outer shell is covered with an upper cover; the center of the upper cover is communicated with a feeding pipe, the top of the feeding pipe is integrally connected with a discharging hopper, the bottom of the feeding pipe is communicated with four first material distributing pipes, and the bottom of each first material distributing pipe is in ball joint with a second material distributing pipe. All the second material distributing pipes can regularly swing in a reciprocating mode with the ball connection point as the center, and the stopping agent is fed into different areas in the outer shell, so that the stopping agent is rapidly mixed and makes contact with water in the different areas, and therefore caking is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fire prevention in coal goaf areas, and in particular to an inhibitor spraying system for fire prevention in coal mine goaf areas. Background Art

[0002] After underground coal mining is completed, the cavities or hollows filled with collapsed coal and rock are called coal mine goafs. Spontaneous combustion of coal is not only an important problem in mines, but also a particularly serious hazard because it occurs in closed or semi-closed environments such as goafs. Spontaneous combustion of coal not only wastes resources, but also pollutes the environment and affects the balance of the surrounding ecosystem. In addition, fires in goafs are prone to cause derivative accidents such as gas explosions and coal dust explosions. The shock waves generated by these explosions are more destructive than fires, posing a great threat to personnel safety and mine machinery and equipment. Therefore, the key to fire prevention in coal goafs is to prevent and control spontaneous combustion of coal. By taking comprehensive fire prevention measures, the possibility of spontaneous combustion can be reduced to ensure safe production in mines and the safety of personnel.

[0003] The equipment for fire prevention in coal mine goafs generally adopts the method of spraying inhibitors for fire prevention. After the inhibitor and water are evenly mixed inside the mixing tank, the prepared inhibitor liquid is pumped to the spray mechanism through the inhibitor pump, and the inhibitor liquid is sprayed into the goaf through the spray mechanism to achieve the purpose of fire prevention.

[0004] When preparing the inhibitor liquid, usually the powdered inhibitor is added to the mixing tank and stirred thoroughly with water. However, since the discharge port of the feed pipe is fixed, the powdered inhibitor always pours into a certain place in the tank. When the inhibitor powder comes into contact with the water in the tank, the water and the inhibitor powder are prone to agglomerate and form a cake because they cannot fully contact and mix with each other, which prolongs the time required for sufficient mixing. In addition, if the agglomerates cannot be finally crushed, it will also affect the smoothness of the spraying mechanism. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned prior art, the present invention provides a retardant spraying system for fire prevention in coal mine goaf areas.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coal mine goaf fire prevention retardant spraying system, comprising a mixing tank, an retardant pump and a spraying mechanism, wherein the mixing tank and the retardant pump, and the retardant pump and the spraying mechanism are connected through a delivery pipeline, the mixing tank comprises an outer shell, the top cover of the outer shell is provided with an upper cover, the center of the upper cover is connected with a feed pipe, the top of the feed pipe is integrally connected with a lower hopper, and the bottom is connected with four first feed pipes, and the bottom of each first feed pipe is ball-connected with a second feed pipe;

[0007] A second mounting plate is arranged between the four second material distribution pipes, and four suspension plates are fixedly connected to the bottom of the second mounting plate. A second bevel gear is rotatably mounted on the inner side of each suspension plate, and a crank is fixed after the shaft rod at the wheel center of each second bevel gear passes through the outer side of the suspension plate. A slider is fixedly connected to the bottom of each crank facing the side of the second material distribution pipe, and a limited seat is fixed on the circumferential surface of each second material distribution pipe along its axial direction, and a slide rail is formed inside the limited seat, and the slider at the end of the crank extends into the corresponding slide rail and is slidably connected thereto, and the second material distribution pipe is made to swing back and forth inside the outer shell by driving the four second bevel gears to rotate synchronously.

[0008] Preferably, a second motor is fixed between the four first distribution pipes at the bottom of the feed pipe, and a driving shaft is fixedly sleeved on the output end of the second motor. The outsides of the four first distribution pipes are commonly fixedly sleeved with a first mounting plate, and the second mounting plate is arranged below the first mounting plate, and the second mounting plate is fixedly connected to the first mounting plate through several connecting columns. The driving shaft passes through the first mounting plate and the second mounting plate downward in sequence, and a first bevel gear is fixedly sleeved on the rear of the second mounting plate, and the four second bevel gears are respectively meshed with the first bevel gear.

[0009] Preferably, a first stirring blade and a second stirring blade are distributed on the circumferential surface of each second material distribution tube, wherein the bottom end of the first stirring blade is flush with the second material distribution tube, and the top end extends to below the limit seat, and the second stirring blade is symmetrically distributed with the first stirring blade, and the length of the second stirring blade is consistent with the length of the second material distribution tube.

[0010] Preferably, the feed pipe is rotatably mounted at the center of the upper cover, and its rotation direction is consistent with the rotation direction of the second motor.

[0011] Preferably, a second linear gear is fixedly sleeved on the outer side of the top of the feed pipe, a first motor is installed on the top of the upper cover, and a first linear gear meshing with the second linear gear is fixedly sleeved on the motor shaft of the first motor.

[0012] Preferably, a stirring paddle is fixedly connected to the end of the driving shaft.

[0013] Preferably, an outer sleeve is installed outside the four second material distribution pipes, and the two ends of the outer sleeve are respectively connected to the feed pipe and the first mounting plate, a double helical groove is opened on the circumferential surface of the outer sleeve along its axial direction, and an inner ring body is installed on the outer sleeve along its axial sliding guide, and a sliding column adapted to the double helical groove is connected to the inner side of the inner ring body, and the sliding column extends into the double helical groove and is slidably connected thereto;

[0014] The outer side of the inner ring body is fixedly connected to the outer ring body through several connecting rods. The outer ring body fits the inner wall of the outer shell. The lower part of the outer ring body is connected to a support ring through several supporting rods. The inner side of the support ring is integrally formed with a T-shaped track. The stirring paddle is located on the support ring and is connected to the T-shaped track in a sliding manner. Two guide columns are also arranged above the outer ring body. The top ends of the two guide columns are fixedly connected to the inner wall of the outer shell, and the bottom ends penetrate the outer ring body and are connected to it in a sliding manner.

[0015] The stirring paddle is connected to the driving shaft through a telescopic rod, and the mother rod and the child rod of the telescopic rod form a limit to each other in the circumferential direction.

[0016] Preferably, a sun gear is provided at the top center of the first mounting plate, and the sun gear is fixedly sleeved on the outside of the driving shaft. A planetary gear is rotatably installed on the circumferential surface of each first distribution pipe. The top end of the outer sleeve is rotatably connected to the feed pipe, and the bottom end is rotatably connected to the first mounting plate. A gear ring meshing with the four planetary gears is fixed on the inner wall of the outer sleeve.

[0017] Compared with the prior art, the present invention provides a fire retardant spraying system for coal mine goaf area fire prevention, which has the following beneficial effects:

[0018] (1) When the inhibitor in the present invention is injected into the lower hopper, the second motor drives the first bevel gear to rotate, and the four second bevel gears rotate synchronously to drive the crank to make a circular motion. During the rotation of the crank, the slider slides inside the corresponding slide rail, so that the second distribution pipe performs regular reciprocating swings with the ball joint as the center. The inhibitor is fed into different areas inside the outer shell, so that the inhibitor is quickly mixed and contacted with the water in different areas, thereby avoiding agglomeration.

[0019] (2) During the reciprocating swing of the four second material distribution pipes in the present invention, the first stirring blades and the second stirring blades on both sides thereof can also disturb the water, thereby accelerating the mixing of water and the inhibitor. The driving shaft can also drive the stirring paddle to rotate while the driving shaft rotates. The rotation of the stirring paddle can also disturb the mixed liquid, thereby promoting the uniform mixing of the inhibitor and water.

[0020] (3) The second material distribution pipe in the present invention makes a circular motion around the center of the first mounting plate while swinging, thereby sprinkling the inhibitor to a larger area inside the outer shell, making the inhibitor more dispersed, and the first stirring blade and the first stirring blade can also stir the solution as the second material distribution pipe makes a circular motion, and the stirring speed of the stirring paddle is equivalent to a secondary speed-up, thereby improving the stirring and mixing effect.

[0021] (4) The outer sleeve in the present invention can rotate slowly relative to the outer shell through the planetary gear system. When the outer sleeve rotates, the sliding column on the inner side of the inner ring body slides inside the double helical groove. Under the limiting action of the guide column, the outer ring body slides back and forth in the vertical direction. While the support ring and the outer ring body move synchronously, the support ring and the stirring paddle are always raised and lowered synchronously together, so that the stirring paddle can stir and mix the entire area below the second feed pipe. The stirring paddle moves slowly in the vertical direction, so that the flow of liquid during the stirring process can be better controlled, avoiding or reducing the occurrence of "swirling" phenomenon, thereby improving the mixing efficiency and quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0023] Figure 1 A schematic diagram of the entire inhibitor spraying system in the embodiment;

[0024] Figure 2 This is a schematic diagram of the structure inside the mixing tank in the embodiment;

[0025] Figure 3 It is a front view schematic diagram of the interior of the mixing tank in the embodiment;

[0026] Figure 4 Schematic diagram of the connection between the first material distribution pipe and the second material distribution pipe in the embodiment;

[0027] Figure 5 Schematic diagram of the installation structure of the paper tube guide mechanism on the transfer box in the embodiment;

[0028] Figure 6 is a schematic diagram of the connection between the first mounting plate and the second mounting plate in the embodiment;

[0029] Figure 7 Schematic diagram of the distribution of the first bevel gear and the second bevel gear at the bottom of the second mounting plate in the embodiment;

[0030] Figure 8 Schematic diagram of the connection between a single second material distribution pipe and a crank in the embodiment;

[0031] Fig. 9 is a schematic diagram of four second material distribution pipes in the embodiment when they are in a rotating state;

[0032] Fig.10 It is a schematic diagram of assembling the sun gear and the planetary gear on the first mounting plate in the embodiment;

[0033] Fig.11 Schematic diagram of the assembly of the support ring and the stirring paddle in the embodiment.

[0034] In the figure: 1, mixing tank; 2, conveying pipeline; 3, inhibitor pump; 4, spray mechanism; 5, outer shell; 6, upper cover; 7, water injection pipe; 8, lower hopper; 9, first linear gear; 10, second linear gear; 11, first motor; 12, outer ring; 13, support rod; 14, support ring; 15, stirring paddle; 16, outer sleeve; 17, feed pipe; 18, telescopic rod; 19, double spiral groove; 20, inner ring; 21, connecting rod; 22, first safety Mounting plate; 23. First material distribution pipe; 24. Second material distribution pipe; 25. Second motor; 26. Drive shaft; 27. Sun gear; 28. Planetary gear; 29. ​​Second mounting plate; 30. Connecting column; 31. Suspension plate; 32. First bevel gear; 33. Second bevel gear; 34. Crank; 35. Sliding block; 36. First stirring blade; 37. Second stirring blade; 38. Limiting seat; 39. Slide rail; 40. Gear ring; 41. Guide column; 42. T-type track. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present invention.

[0036] This embodiment proposes a system for spraying a retardant for fire prevention in coal mine goafs, such as Figures 1 to 11 As shown, it includes a mixing tank 1, an inhibitor pump 3 and a spray mechanism 4, wherein the mixing tank 1 and the inhibitor pump 3 and the inhibitor pump 3 and the spray mechanism 4 are connected by a delivery pipe 2. After the inhibitor and water are evenly mixed inside the mixing tank 1, the prepared inhibitor liquid is pumped into the spray mechanism 4 by the inhibitor pump 3, and the inhibitor liquid is sprayed into the goaf by the spray mechanism 4, thereby achieving the purpose of fire prevention. The inhibitor pump 3 and the spray mechanism 4 in the present invention are not specifically limited, and the currently existing technology can be used. The quality of the preparation of the inhibitor liquid directly affects the smooth operation of the spray mechanism 4 and the fire prevention effect.

[0037] When preparing the existing inhibitor liquid, usually a powdered inhibitor is added to a mixing tank 1 and fully stirred with water. However, since the powdered inhibitor will form lumps when poured into water, the time required for full mixing is prolonged. If these lumps cannot be finally crushed, they will also affect the patency of the spray mechanism 4. Based on this, the purpose of the present invention is to make the inhibitor fully mixed with water inside the mixing tank 1. Specifically, the mixing tank 1 includes an outer shell 5, the top cover of the outer shell 5 is provided with an upper cover 6, and a feed pipe 17 is connected to the center of the upper cover 6. The top of the feed pipe 17 is integrally formed. The molding is connected with a lower hopper 8, and four first distribution pipes 23 are connected at the bottom. The bottom of each first distribution pipe 23 is spherically connected with a second distribution pipe 24. The inhibitor in the lower hopper 8 is diverted to the four first distribution pipes 23, and finally falls into the outer shell 5 from the bottom of the second distribution pipes 24. The four second distribution pipes 24 are constantly swinging while injecting materials into the outer shell 5, so as to inject the inhibitor into different areas inside the outer shell 5. The inhibitor is mixed and contacted with water in different areas inside the outer shell 5, which is equivalent to feeding the inhibitor in a dispersed manner to avoid agglomeration.

[0038] Furthermore, in this embodiment, a second motor 25 is fixed between the four first material distribution pipes 23 at the bottom of the feed pipe 17, and a drive shaft 26 is fixedly sleeved at the output end of the second motor 25. The outsides of the four first material distribution pipes 23 are commonly fixedly sleeved with a first mounting plate 22, and a second mounting plate 29 is arranged below the first mounting plate 22. The second mounting plate 29 is distributed between the four second material distribution pipes 24, and the second mounting plate 29 is fixedly connected to the first mounting plate 22 through a number of connecting columns 30. The drive shaft 26 passes through the first mounting plate 22 and the second mounting plate 29 in sequence downward, and the fixed sleeve is sleeved with a first bevel gear 32. The second mounting plate Four suspension plates 31 are fixedly connected to the bottom of 29, and a second bevel gear 33 is rotatably installed on the inner side of each suspension plate 31, and each second bevel gear 33 is meshed with the first bevel gear 32. The shaft at the center of each second bevel gear 33 passes through the outer side of the suspension plate 31 and is fixed with a crank 34. The bottom of each crank 34 is fixedly connected to a slider 35 on the side facing the second distribution pipe 24. A limiting seat 38 is fixed on the circumferential surface of each second distribution pipe 24 along its axial direction, and a slide rail 39 is formed inside the limiting seat 38. The slider 35 at the end of the crank 34 extends into the corresponding slide rail 39 and is slidably connected thereto. When the inhibitor is injected into the lower hopper 8, the second motor 25 drives the first bevel gear 32 to rotate, and the four second bevel gears 33 mesh with the first bevel gear 32 and rotate synchronously, thereby driving the crank 34 to make a circular motion. During the rotation of the crank 34, the slider 35 slides inside the corresponding slide rail 39, so that the second distribution pipe 24 performs regular reciprocating swings with the ball joint as the center, and because the four second distribution pipes 24 swing synchronously, there is no motion interference between the four. Finally, the inhibitor is fed into different areas inside the outer shell 5, so that the inhibitor is quickly mixed and contacted with the water in different areas, thereby avoiding agglomeration.

[0039] In addition, the circumferential surface of each second material distribution tube 24 in this embodiment is also distributed with a first stirring blade 36 and a second stirring blade 37, wherein the first stirring blade 36 is located below the limit seat 38 and is shorter, while the second stirring blade 37 is symmetrically distributed with the first stirring blade 36, and the length of the second stirring blade 37 is consistent with the length of the second material distribution tube 24. When the second material distribution tube 24 is in the reciprocating swing process, the first stirring blade 36 and the second stirring blade 37 can also disturb the water to accelerate the mixing of water and the inhibitor. Moreover, the end of the drive shaft 26 in this embodiment is also fixedly connected to a stirring paddle 15, and the rotation of the drive shaft 26 can also drive the stirring paddle 15 to rotate, and the rotation of the stirring paddle 15 can disturb the mixed liquid to promote the uniform mixing of the inhibitor and water.

[0040] In the above scheme, since the first mounting plate 22 and the second mounting plate 29 are relatively fixed inside the outer shell 5, the four second distribution pipes 24 can only reciprocate along a fixed angle. In order to further improve the mixing effect, the present invention rotatably mounts the feed pipe 17 at the center of the upper cover 6. Specifically, the outer side of the top of the feed pipe 17 is fixedly sleeved with a second linear gear 10, and the top of the upper cover 6 is installed with a first motor 11. The motor shaft of the first motor 11 is fixedly sleeved with a first linear gear 9 that meshes with the outside of the second linear gear 10. The feed pipe 17 can be driven to rotate relative to the upper cover 6 by the first motor 11 (note that the rotation direction of the feed pipe 17 is consistent with that of the second motor 25). While the feed pipe 17 is rotating, the first mounting plate 22, the second feed pipe 24 and the stirring paddle 15 are rotating synchronously inside the outer shell 5, and the second motor 25 drives the second feed pipe 24 to swing back and forth, and the stirring paddle 15 rotates relative to the first mounting plate 22. While the second feed pipe 24 is swinging, it also makes a circular motion around the center of the first mounting plate 22, thereby sprinkling the inhibitor to more areas inside the outer shell 5, making the inhibitor more dispersed, and the first stirring blade 36 and the first stirring blade 36 can also stir the solution as the second feed pipe 24 makes a circular motion, and the stirring speed of the stirring paddle 15 is equivalent to a secondary speed-up, thereby improving the stirring and mixing effect.

[0041] In addition, the stirring paddle 15 in this embodiment is fixed at the bottom of the outer shell 5, so its effective area is limited. In order to enable the stirring paddle 15 to stir and mix the entire area below the second distribution pipe 24, the present invention is provided with a sun gear 27 at the top center of the first mounting plate 22, and the sun gear 27 is fixedly sleeved on the outside of the drive shaft 26, and a planetary gear 28 is rotatably mounted on the circumferential surface of each first distribution pipe 23, and an outer sleeve 16 is installed on the outside of the four second distribution pipes 24. The top of the outer sleeve 16 is rotatably connected to the feed pipe 17, and the bottom The outer sleeve 16 is connected to the first mounting plate 22 for rotation. A gear ring 40 meshing with four planetary gears 28 is fixed on the inner wall of the outer sleeve 16. When the second motor 25 drives the drive shaft 26 to rotate, the outer sleeve 16 and the drive shaft 26 rotate in opposite directions. However, the feed pipe 17, the outer sleeve 16, the first mounting plate 22 and the like are rotated as a whole under the drive of the first motor 11. Therefore, by controlling the speed of the first motor 11 and the second motor 25 and the diameter ratio of the sun gear 27 and the planetary gear 28, the outer sleeve 16 can be slowly rotated relative to the outer shell 5. The outer sleeve 16 is provided with a double helical groove 19 along its axial direction on its circumferential surface, and an inner ring body 20 is installed on the outer sleeve 16 along its axial sliding guide. The inner side of the inner ring body 20 is connected with a sliding column adapted to the double helical groove 19. The sliding column extends into the double helical groove 19 and is slidably connected thereto. The outer side of the inner ring body 20 is fixedly connected to the outer ring body 12 through a plurality of connecting rods 21. The outer ring body 12 is connected to the inner side of the outer sleeve 16. The walls are fitted together, and a support ring 14 is connected to the bottom of the outer ring body 12 through several support rods 13. A T-shaped track 42 is formed integrally on the inner side of the support ring 14. The stirring paddle 15 is located on the support ring 14 and is slidably connected to the T-shaped track 42. The stirring paddle 15 and the drive shaft 26 are connected through a telescopic rod 18, and the mother rod and the child rod of the telescopic rod 18 are limited to each other in the circumferential direction (limiting ribs are formed integrally on the circumferential surface of the child rod, and matching rib grooves are formed on the mother rod, and the mother rod and the child rod can only slide relative to each other in the axial direction). Two guide columns 41 are also arranged above the outer ring body 12. The top ends of the two guide columns 41 are fixedly connected to the inner wall of the outer shell 5, and the bottom ends pass through the outer ring body 12 and are slidably connected thereto. The two guide columns 41 limit the movement of the outer ring body 12. When the outer sleeve 16 rotates, the sliding column on the inner side of the inner ring body 20 slides inside the double helical groove 19. Under the limiting action of the guide columns 41, the outer ring body 12 slides back and forth in the vertical direction. While the support ring 14 and the outer ring body 12 move synchronously, the support ring 14 and the stirring paddle 15 are always raised and lowered synchronously together. Therefore, the stirring paddle 15 can rotate at high speed below the second distribution pipe 24 and can be raised and lowered slowly, thereby stirring the solution in this area.

[0042] It should be noted that the present invention can also choose to open a double spiral groove 19 on the circumferential surface of the feed pipe 17. Although this can also drive the stirring paddle 15 to reciprocate in the vertical direction, the rotation speed of the feed pipe 17 needs to be guaranteed in consideration of the dispersion of the material sprinkled by the second feed pipe 24 and the stirring rate of the second stirring blade 37. However, if the rotation speed of the feed pipe 17 is too fast, the movement of the stirring paddle 15 in the vertical direction will also be accelerated. Raising and lowering the stirring paddle 15 too quickly may cause "swirl" phenomenon, resulting in poor mixing effect. However, the present invention can achieve deceleration of the rotation of the feed pipe 17 through the above structure, and then slowly raise and lower the stirring paddle 15 in the vertical direction, so as to better control the flow of the liquid during the stirring process, avoid or reduce the occurrence of "swirl" phenomenon, and thus improve the mixing efficiency and quality.

[0043] In the description of the present invention, the terms "first", "second", "another", and "yet another" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A retardant spraying system for fire prevention in coal mine goaf, comprising a mixing tank (1), an retardant pump (3) and a spraying mechanism (4), wherein the mixing tank (1) and the retardant pump (3) as well as the retardant pump (3) and the spraying mechanism (4) are connected via a delivery pipeline (2), characterized in that: The mixing tank (1) comprises an outer shell (5), the top cover of the outer shell (5) is provided with an upper cover (6), a feed pipe (17) is connected to the center of the upper cover (6), the top of the feed pipe (17) is integrally connected to a lower hopper (8), and four first distribution pipes (23) are connected to the bottom, and the bottom of each first distribution pipe (23) is spherically connected to a second distribution pipe (24); A second mounting plate (29) is provided between the four second material distribution pipes (24), and four suspension plates (31) are fixedly connected to the bottom of the second mounting plate (29). A second bevel gear (33) is rotatably mounted on the inner side of each suspension plate (31). A shaft at the wheel center of each second bevel gear (33) passes through the outer side of the suspension plate (31) and is fixed with a crank (34). A slider (35) is fixedly connected to the bottom of each crank (34) on the side facing the second material distribution pipe (24). A limiting seat (38) is fixed along the axial direction on the circumferential surface of each second material distribution pipe (24), and a slide rail (39) is formed inside the limiting seat (38). The slider (35) at the end of the crank (34) extends into the corresponding slide rail (39) and is slidably connected thereto. By driving the four second bevel gears (33) to rotate synchronously, the second material distribution pipe (24) is reciprocated inside the outer shell (5).

2. The retardant spraying system for fire prevention in coal mine goaf according to claim 1 is characterized in that: A second motor (25) is fixed between the four first material distribution pipes (23) at the bottom of the feed pipe (17); the output end of the second motor (25) is fixedly sleeved with a drive shaft (26); the outsides of the four first material distribution pipes (23) are commonly fixedly sleeved with a first mounting plate (22); a second mounting plate (29) is arranged below the first mounting plate (22), and the second mounting plate (29) is fixedly connected to the first mounting plate (22) through a plurality of connecting columns (30); the drive shaft (26) passes downward through the first mounting plate (22) and the second mounting plate (29) in sequence, and a first bevel gear (32) is fixedly sleeved thereafter; the four second bevel gears (33) are respectively meshed with the first bevel gear (32).

3. The retardant spraying system for fire prevention in coal mine goaf according to claim 2 is characterized in that: A first stirring blade (36) and a second stirring blade (37) are also distributed on the circumferential surface of each second material distribution tube (24), wherein the bottom end of the first stirring blade (36) is flush with the second material distribution tube (24), and the top end extends to below the limit seat (38), and the second stirring blade (37) is symmetrically distributed with the first stirring blade (36), and the length of the second stirring blade (37) is consistent with the length of the second material distribution tube (24).

4. The retardant spraying system for fire prevention in coal mine goaf according to claim 3 is characterized in that: The feed pipe (17) is rotatably mounted at the center of the upper cover (6), and its rotation direction is consistent with the rotation direction of the second motor (25).

5. The retardant spraying system for fire prevention in coal mine goaf according to claim 4 is characterized in that: A second linear gear (10) is fixedly sleeved on the outer side of the top of the feed pipe (17), a first motor (11) is installed on the top of the upper cover (6), and a first linear gear (9) meshing with the outside of the second linear gear (10) is fixedly sleeved on the motor shaft of the first motor (11).

6. The retardant spraying system for fire prevention in coal mine goaf according to claim 5 is characterized in that: The end of the driving shaft (26) is also fixedly connected to a stirring paddle (15).

7. The retardant spraying system for fire prevention in coal mine goaf according to claim 6 is characterized in that: An outer sleeve (16) is installed outside the four second material distribution pipes (24), and the two ends of the outer sleeve (16) are respectively connected to the feed pipe (17) and the first mounting plate (22). A double helical groove (19) is opened on the circumferential surface of the outer sleeve (16) along its axial direction. An inner ring body (20) is installed outside the outer sleeve (16) along its axial sliding guide. A sliding column matched with the double helical groove (19) is connected to the inner side of the inner ring body (20), and the sliding column extends into the double helical groove (19) and is slidably connected thereto. The outer side of the inner ring body (20) is fixedly connected to the outer ring body (12) via a plurality of connecting rods (21), the outer ring body (12) is fitted with the inner wall of the outer shell (5), the lower side of the outer ring body (12) is connected to a support ring (14) via a plurality of support rods (13), the inner side of the support ring (14) is integrally formed with a T-shaped track (42), the stirring paddle (15) is located on the support ring (14) and is slidably connected to the T-shaped track (42), and two guide columns (41) are further arranged above the outer ring body (12), the top ends of the two guide columns (41) are fixedly connected to the inner wall of the outer shell (5), and the bottom ends penetrate the outer ring body (12) and are slidably connected thereto; The stirring paddle (15) and the driving shaft (26) are connected via a telescopic rod (18), and the main rod and the sub-rod of the telescopic rod (18) form a limit to each other in the circumferential direction.

8. The retardant spraying system for fire prevention in coal mine goaf according to claim 7 is characterized in that: A sun gear (27) is arranged at the top center of the first mounting plate (22), and the sun gear (27) is fixedly sleeved on the outside of the driving shaft (26). A planetary gear (28) is rotatably mounted on the circumferential surface of each first material distribution pipe (23). The top end of the outer sleeve (16) is rotatably connected to the feed pipe (17), and the bottom end is rotatably connected to the first mounting plate (22). A gear ring (40) meshing with the four planetary gears (28) is fixed on the inner wall of the outer sleeve (16).

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