Grouting mixing device for coal goaf

Abstract

The coal goaf grouting mixing device comprises a stirring cavity, four first supporting legs are fixedly installed at the bottom of the stirring cavity, a plurality of stirring blades are rotatably installed in an inner cavity of the stirring cavity, and a first discharging pipe is rotatably installed on one side of the stirring cavity; the feeding mechanism is used for crushing grouting raw materials; the feeding mechanism comprises a crushing box, the crushing box is fixedly mounted at the top of the stirring cavity, and a feeding pipe is fixedly mounted at the top of the crushing box; an output shaft of a third motor drives gears to rotate, then the two gears drive two smashing rollers to rotate, grouting raw materials entering an inner cavity of a stirring cavity can pass through the space between the two smashing rollers, the two smashing rollers can smash the hardened grouting raw materials at the moment, meanwhile, due to the fact that smoke dust can appear in the grouting raw material smashing process, the grouting raw materials can be smashed, and the smashing efficiency is improved. Therefore, water in the water tank is pumped out through the second water pump and discharged into the inner cavity of the smashing box through the second water pipe, and smoke dust in the inner cavity of the smashing box is adsorbed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grouting mixing, in particular to a coal goaf grouting mixing device. BACKGROUND

[0002] In order to effectively manage the goaf, grouting technology is one of the commonly used and relatively effective means. Its principle is to fill the goaf with suitable grouting materials (usually containing cement, fly ash, water glass and other components mixed in a certain proportion) to fill the goaf, cracks and other spaces, support the overburden strata, prevent the strata from further collapse, and reduce the surface deformation, thereby preventing and controlling the related geological disasters of the goaf and improving the stability of the surface above the goaf.

[0003] After searching, the patent document with publication number CN216935602U discloses a shield secondary grouting mixing device, which includes a stirring cylinder, the stirring cylinder is a closed cylinder structure at the bottom, and a stirring assembly for mixing grouting raw materials is arranged in the stirring cylinder, a rotating assembly is arranged between the stirring assembly and the stirring cylinder to provide power for the stirring assembly, and a scraper is arranged between the stirring assembly and the stirring cylinder.

[0004] The above device provides power for the stirring assembly through the rotating assembly to stir and mix the raw materials in the stirring cylinder. However, in actual use, since the grouting work is carried out outdoors and the construction site environment is complex, there may be cases of raw material hardening in the grouting raw materials. The hardened raw materials cannot be crushed after entering the stirring cylinder, and the hardened raw materials will cause uneven mixing of the grouting raw materials, affecting the grouting effect.

[0005] Therefore, a coal goaf grouting mixing device is proposed to solve the above problems. SUMMARY

[0006] In order to make up for the shortcomings of the prior art and solve the problem of grouting raw material hardening, the present application provides a coal goaf grouting mixing device.

[0007] A coal goaf grouting mixing device, comprising a stirring cavity, four first supporting legs are fixedly installed at the bottom of the stirring cavity, a plurality of stirring blades are rotatably installed in the inner cavity of the stirring cavity, and a first discharge pipe is rotatably installed on one side of the stirring cavity;

[0008] Further comprising a feeding mechanism for crushing the grouting raw materials;

[0009] The feeding mechanism comprises a crushing box fixedly installed at the top of the stirring cavity, an inlet pipe fixedly installed at the top of the crushing box, two crushing rollers rotatably installed in the crushing box, two gears rotatably installed on the outer surface of the crushing box and fixedly connected with the two crushing rollers respectively, one of the gears fixedly connected with a third motor at one side, the third motor fixedly installed at one side of the crushing box, a conveying pipe fixedly installed at the bottom of the crushing box and penetrating into the stirring cavity.

[0010] Preferably, a first motor is fixedly installed at one side of the stirring cavity, a worm shaft is fixedly connected with the output shaft of the first motor, a fixed block is fixedly connected with one side of the worm shaft, and the fixed block is fixedly installed at one side of the stirring cavity.

[0011] Preferably, a worm wheel is engaged with the outer surface of the worm shaft, the worm shaft is fixedly installed on the outer surface of the first discharge pipe, and the first discharge pipe is fixedly connected with a second discharge pipe at one end.

[0012] Preferably, three belt pulleys are rotatably installed at one side of the stirring cavity, adjacent two belt pulleys are driven by a belt, one of the belt pulleys is fixedly connected with a second motor at one side, the second motor is fixedly connected with a fixed frame at one side, and the fixed frame is fixedly installed at one side of the stirring cavity.

[0013] Preferably, two reciprocating lead screws are rotatably installed in the stirring cavity, the two reciprocating lead screws penetrate through the side wall of the stirring cavity at one end and are fixedly connected with two of the belt pulleys at one side respectively, a scraper is slidably installed on the inner wall of the stirring cavity, two threaded holes are formed in one side of the scraper, and the two reciprocating lead screws are threadedly installed on the inner surfaces of the two threaded holes respectively.

[0014] Preferably, two limiting holes are formed in one side of the scraper, a limiting rod is slidably installed on the inner surface of the limiting hole, the limiting rod is fixedly installed in the stirring cavity, a rotating shaft is rotatably installed in the stirring cavity, the rotating shaft penetrates through the side wall of the stirring cavity at one end and is fixedly connected with one of the belt pulleys at one side, and a plurality of stirring blades are fixedly installed on the outer surface of the rotating shaft.

[0015] Preferably, four second supporting legs are fixedly installed at the top of the stirring cavity, a water tank is fixedly installed at the top of the four second supporting legs, a first water pump is fixedly installed at the bottom of the water tank, a first water pipe is fixedly connected with the first water pump at the bottom, four spray heads are uniformly fixedly connected with the first water pipe at the bottom, the four spray heads penetrate into the stirring cavity, and a water inlet pipe is fixedly installed at the top of the water tank.

[0016] Preferably, a second water pump is fixedly installed at the top of the water tank, a second water pipe is fixedly connected to the top of the second water pump, one end of the second water pipe penetrates into the inner cavity of the crushing box, the bottom of the second water pump penetrates into the inner cavity of the water tank, and four third supporting legs are fixedly installed at the bottom of the crushing box, wherein two of the third supporting legs are fixedly installed on the outer surface of the stirring cavity.

[0017] The present application has the advantages of:

[0018] 1. The present application pours the grouting raw materials into the inner cavity of the crushing box through the feeding pipe, then one of the gears rotates through the third motor output shaft, the two gears start to rotate through the meshing effect, then the two crushing rollers start to rotate through the two gears, the grouting raw materials in the inner cavity of the stirring cavity pass between the two crushing rollers, at this time, the two crushing rollers crush the hardened grouting raw materials, at the same time, the second water pump pumps the water in the water tank out through the second water pipe and discharges it into the inner cavity of the crushing box to adsorb the smoke and dust in the inner cavity of the crushing box, so as to avoid the smoke and dust in the crushing box from flowing out and polluting the environment, and finally the crushed grouting raw materials flow into the inner cavity of the stirring cavity through the conveying pipe.

[0019] 2. The second motor output shaft rotates one of the pulleys through two belt drives, the three pulleys start to rotate, at this time, two of the pulleys rotate two reciprocating lead screws in the inner surface of the threaded hole, due to the limiting effect of the two limiting rods slidingly installed in the inner surface of the two limiting holes, the scraper makes a circular reciprocating motion in the inner cavity of the stirring cavity, further realizing the effect of the scraper cleaning the grouting raw materials on the inner wall of the stirring cavity, at the same time, one of the pulleys also rotates the shaft, and the shaft further rotates the stirring blades in the inner cavity of the stirring cavity to realize the stirring effect on the grouting raw materials.

[0020] 3. The first water pump pumps the water in the water tank out through the first water pipe and the nozzle to realize the purpose of adding water to the inner cavity of the stirring cavity, at the same time, when it is necessary to clean the inner wall of the stirring cavity, spraying water on the inner wall of the stirring cavity is beneficial to cleaning the grouting mixture on the inner wall of the stirring cavity, finally the grouting mixture is discharged through the first discharge pipe, when it is necessary to change the discharge direction of the grouting mixture, the first motor output shaft rotates the worm, the worm and the worm gear interact to make the worm gear rotate with the first discharge pipe, thereby realizing the purpose of adjusting the discharge direction of the grouting raw materials. BRIEF DESCRIPTION OF DRAWINGS

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the sidewall connection structure of the stirring chamber according to an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the stirring chamber according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of a water tank installation structure according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the pulverizing box installation structure according to an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the internal structure of the pulverizing chamber according to an embodiment of the present invention.

[0028] In the diagram: 1. Mixing chamber; 11. First support leg; 2. First discharge pipe; 21. Second discharge pipe; 22. First motor; 23. Worm gear; 24. Fixing block; 25. Worm wheel; 3. Pulley; 31. Belt; 32. Second motor; 33. Fixing frame; 34. Reciprocating screw; 35. Scraper; 351. Limiting hole; 352. Threaded hole; 353. Limiting rod; 36. Rotating shaft; 37. Mixing blade; 4. Second support leg; 41. Water tank; 411. Water inlet pipe; 42. First water pump; 43. First water pipe; 44. Nozzle; 45. Second water pump; 46. Second water pipe; 5. Third support leg; 51. Crushing box; 511. Feed pipe; 52. Conveying pipe; 53. Gear; 54. Third motor; 55. Crushing roller. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] Please see Figures 1 to 6As shown, a coal goaf grouting mixing device includes a mixing chamber 1, with four first support legs 11 fixedly installed at the bottom of the mixing chamber 1. Several mixing blades 37 are rotatably installed inside the mixing chamber 1, and a first discharge pipe 2 is rotatably installed on one side of the mixing chamber 1. It also includes a feeding mechanism for crushing the grouting raw materials. The feeding mechanism includes a crushing box 51, which is fixedly installed at the top of the mixing chamber 1. A feeding pipe 511 is fixedly installed at the top of the crushing box 51. Two crushing rollers 55 are rotatably installed inside the crushing box 51, and the two crushing rollers 55 mesh with each other. Two gears 53 are rotatably installed on the outer surface of the crushing box 51, and the two gears 53 are respectively fixedly connected to the two crushing rollers 55. A third motor 54 is fixedly connected to one side of one of the gears 53 and is fixedly installed on one side of the crushing box 51. A conveying pipe 52 is fixedly installed at the bottom of the crushing box 51, and one end of the conveying pipe 52 extends into the inner cavity of the mixing chamber 1.

[0031] When mixing grouting materials, caking occurs. The caking materials cannot be broken up during the mixing process, which affects the mixing ratio of the grouting materials and ultimately affects the grouting effect.

[0032] In use, the present invention first adds raw materials into the inner cavity of the crushing box 51 through the feed pipe 511. All raw materials pass between the two crushing rollers 55. The output shaft of the third motor 54 drives one of the gears 53 to rotate. The two gears 53 mesh with each other and rotate synchronously. Furthermore, the two gears 53 drive the two crushing rollers 55 to rotate. The meshing and rotation of the two crushing rollers 55 can crush the agglomerated raw materials. Then, the raw materials enter the inner cavity of the mixing chamber 1 through the conveying pipe 52. Finally, the raw materials gather in the inner cavity of the mixing chamber 1. At this time, several stirring blades 37 rotate in the inner cavity of the mixing chamber 1 to stir and mix the raw materials in the inner cavity of the mixing chamber 1, thereby obtaining a mixture that can be used for grouting work.

[0033] Furthermore, such as Figure 2 As shown, a first motor 22 is fixedly installed on one side of the stirring chamber 1, and a worm gear 23 is fixedly connected to the output shaft of the first motor 22. A fixing block 24 is fixedly connected to one side of the worm gear 23, and the fixing block 24 is fixedly installed on one side of the stirring chamber 1.

[0034] The outer surface of the worm 23 is engaged with a worm wheel 25. The worm 23 is fixedly installed on the outer surface of the first discharge pipe 2. One end of the first discharge pipe 2 is fixedly connected to a second discharge pipe 21.

[0035] In use, the invention first drives the worm gear 23 to rotate through the output shaft of the first motor 22. The worm gear 23 then drives the worm wheel 25 to rotate. When it is necessary to discharge the grouting mixture in the mixing chamber 1 to a designated location, the rotation of the worm wheel 25 drives the second discharge pipe 21 to adjust its direction, thereby aligning the second discharge pipe 21 with the location where the grouting needs to be discharged, thus achieving precise discharge of the grouting material.

[0036] Furthermore, such as Figure 3 As shown, three pulleys 3 are rotatably mounted on one side of the stirring chamber 1. Two adjacent pulleys 3 are driven by belts 31. A second motor 32 is fixedly connected to one side of one of the pulleys 3. A fixing frame 33 is fixedly connected to one side of the second motor 32. The fixing frame 33 is fixedly installed on one side of the stirring chamber 1.

[0037] Two reciprocating lead screws 34 are rotatably installed inside the stirring chamber 1. One end of each of the two reciprocating lead screws 34 passes through the side wall of the stirring chamber 1 and is fixedly connected to one side of one of the two pulleys 3. A scraper 35 is slidably installed on the inner wall of the stirring chamber 1. Two threaded holes 352 are opened on one side of the scraper 35. The two reciprocating lead screws 34 are respectively threaded on the inner surface of the two threaded holes 352.

[0038] Two limiting holes 351 are provided on one side of the scraper 35. A limiting rod 353 is slidably installed on the inner surface of the limiting hole 351. The limiting rod 353 is fixedly installed in the inner cavity of the stirring chamber 1. A rotating shaft 36 is rotatably installed in the inner cavity of the stirring chamber 1. One end of the rotating shaft 36 passes through the side wall of the stirring chamber 1 and is fixedly connected to one side of one of the pulleys 3. Several stirring blades 37 are fixedly installed on the outer surface of the rotating shaft 36.

[0039] In use, the invention first drives one of the pulleys 3 to rotate via the output shaft of the second motor 32. After being driven by the belt 31, all three pulleys 3 begin to rotate. Two of the pulleys 3 drive two reciprocating screws 34 to rotate. The two reciprocating screws 34 rotate simultaneously on the inner surface of the two threaded holes 352, which drives the scraper 35 to slide back and forth along the inner wall of the mixing chamber 1, thereby achieving the purpose of cleaning the inner wall of the mixing chamber 1. At the same time, when the scraper 35 slides, the two limiting rods 353 slide on the inner surface of the two limiting holes 351, which serves to limit the scraper 35.

[0040] One of the pulleys 3 drives the shaft 36 to rotate, and the shaft 36 drives several stirring blades 37 to rotate. When stirring the grouting material, the stirring blades 37 circulate and touch the grouting material to achieve the purpose of stirring the grouting material.

[0041] Furthermore, such as Figure 4As shown, four second support legs 4 are fixedly installed on the top of the mixing chamber 1, the water tank 41 is fixedly installed on the top of the four second support legs 4, a first water pump 42 is fixedly installed on the bottom of the water tank 41, a first water pipe 43 is fixedly connected to the bottom of the first water pump 42, four nozzles 44 are evenly fixedly connected to the bottom of the first water pipe 43, the four nozzles 44 penetrate into the inner cavity of the mixing chamber 1, and a water supply pipe 411 is fixedly installed on the top of the water tank 41.

[0042] In use, the present invention first pumps water from the water tank 41 through the first water pump 42, and then the water flows through the first water pipe 43 to several nozzles 44. The nozzles 44 spray water into the inner cavity of the mixing chamber 1, which can achieve the purpose of adding water to mix the grouting material. At the same time, when it is necessary to clean the inner wall of the mixing chamber 1, the nozzles 44 spray water onto the inner wall of the mixing chamber 1, which makes it easier for the staff to clean the inner wall of the mixing chamber 1. In addition, the scraper 35 is used to scrape the inner wall of the mixing chamber 1 in a circular motion, thereby achieving the purpose of cleaning the inner wall of the mixing chamber 1.

[0043] Furthermore, such as Figure 5 As shown, a second water pump 45 is fixedly installed on the top of the water tank 41, and a second water pipe 46 is fixedly connected to the top of the second water pump 45. One end of the second water pipe 46 passes through the inner cavity of the crushing chamber 51, and the bottom of the second water pump 45 passes through the inner cavity of the water tank 41. Four third support legs 5 are fixedly installed on the bottom of the crushing chamber 51, two of which are fixedly installed on the outer surface of the stirring chamber 1.

[0044] In order to reduce the dust during the crushing of grouting materials, the water in the inner cavity of the water tank 41 is drawn out by the second water pump 45. Then the water flows through the second water pipe 46 to the inner cavity of the crushing box 51. The dust in the inner cavity of the crushing box 51 will be absorbed by the water, then gather and finally converge at the bottom of the crushing box 51, and finally flow out through the conveying pipe 52 to the inner cavity of the stirring chamber 1.

[0045] Working principle: First, the grouting material is poured into the inner cavity of the crushing box 51 through the feed pipe 511. Then, the output shaft of the third motor 54 drives one of the gears 53 to rotate. After meshing, both gears 53 start to rotate. Then, the two gears 53 drive the two crushing rollers 55 to rotate respectively. The grouting material entering the inner cavity of the mixing chamber 1 will pass between the two crushing rollers 55. At this time, the two crushing rollers 55 will crush the clumped grouting material. At the same time, since dust will be generated during the crushing process of the grouting material, the second water pump 45 draws water from the water tank 41 and discharges it into the inner cavity of the crushing box 51 through the second water pipe 46 to absorb the dust in the inner cavity of the crushing box 51 and prevent the dust in the crushing box 51 from flowing out and polluting the environment. Finally, the crushed grouting material flows into the inner cavity of the mixing chamber 1 through the conveying pipe 52.

[0046] After the grouting material flows into the inner cavity of the mixing chamber 1, the output shaft of the second motor 32 drives one of the pulleys 3 to rotate, which is then driven by two belts 31. All three pulleys 3 begin to rotate. At this time, two of the pulleys 3 drive two reciprocating screws 34 to rotate on the inner surface of the threaded holes 352. Due to the limiting effect of the two limiting rods 353 slidingly installed on the inner surface of the two limiting holes 351, the scraper 35 will make a cyclic reciprocating motion in the inner cavity of the mixing chamber 1, further realizing the effect of cleaning the grouting material on the inner wall of the mixing chamber 1 by the scraper 35. At the same time, one of the pulleys 3 will also drive the rotating shaft 36 to rotate, and the rotating shaft 36 will drive several stirring blades 37 in the inner cavity of the mixing chamber 1. The rotation achieves the mixing effect of the grouting material. During mixing, the water in the water tank 41 is drawn out by the first water pump 42 and discharged through the first water pipe 43 and the nozzle 44, which can achieve the purpose of adding water to the inner cavity of the mixing chamber 1. At the same time, when it is necessary to clean the inner wall of the mixing chamber 1, spraying water on the inner wall of the mixing chamber 1 is beneficial to cleaning the grouting mixture on the inner wall of the mixing chamber 1. Finally, the grouting mixture is discharged through the first discharge pipe 2. When it is necessary to change the discharge direction of the grouting mixture, the output shaft of the first motor 22 drives the worm 23 to rotate. The interaction between the worm 23 and the worm wheel 25 can make the worm wheel 25 drive the first discharge pipe 2 to rotate, thereby achieving the purpose of adjusting the spraying direction of the grouting material.

[0047] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A grouting and mixing device for coal goaf, characterized in that: It includes a stirring chamber (1), four first support legs (11) are fixedly installed at the bottom of the stirring chamber (1), a number of stirring blades (37) are rotatably installed in the inner cavity of the stirring chamber (1), and a first discharge pipe (2) is rotatably installed on one side of the stirring chamber (1). It also includes a feeding mechanism for crushing the grouting raw materials; The feature is that the feeding mechanism includes a crushing box (51), which is fixedly installed on the top of the mixing chamber (1). A feeding pipe (511) is fixedly installed on the top of the crushing box (51). Two crushing rollers (55) are rotatably installed inside the crushing box (51). The two crushing rollers (55) mesh with each other. Two gears (53) are rotatably installed on the outer surface of the crushing box (51). The two gears (53) are fixedly connected to the two crushing rollers (55) respectively. A third motor (54) is fixedly connected to one side of one of the gears (53). The third motor (54) is fixedly installed on one side of the crushing box (51). A conveying pipe (52) is fixedly installed at the bottom of the crushing box (51). One end of the conveying pipe (52) extends into the inner cavity of the mixing chamber (1).

2. The coal goaf grouting and mixing device according to claim 1, characterized in that: A first motor (22) is fixedly installed on one side of the stirring chamber (1). A worm gear (23) is fixedly connected to the output shaft of the first motor (22). A fixing block (24) is fixedly connected to one side of the worm gear (23). The fixing block (24) is fixedly installed on one side of the stirring chamber (1).

3. The coal goaf grouting and mixing device according to claim 2, characterized in that: The outer surface of the worm (23) is engaged with a worm wheel (25), and the worm (23) is fixedly installed on the outer surface of the first discharge pipe (2). One end of the first discharge pipe (2) is fixedly connected to a second discharge pipe (21).

4. A coal goaf grouting and mixing device according to claim 3, characterized in that: Three pulleys (3) are rotatably installed on one side of the stirring chamber (1). Two adjacent pulleys (3) are driven by a belt (31). A second motor (32) is fixedly connected to one side of one of the pulleys (3). A fixing frame (33) is fixedly connected to one side of the second motor (32). The fixing frame (33) is fixedly installed on one side of the stirring chamber (1).

5. A coal goaf grouting and mixing device according to claim 4, characterized in that: The stirring chamber (1) is rotatably equipped with two reciprocating screws (34). One end of each of the two reciprocating screws (34) passes through the side wall of the stirring chamber (1) and is fixedly connected to one side of one of the two pulleys (3). A scraper (35) is slidably installed on the inner wall of the stirring chamber (1). Two threaded holes (352) are opened on one side of the scraper (35). The two reciprocating screws (34) are respectively threaded on the inner surface of the two threaded holes (352).

6. A coal goaf grouting and mixing device according to claim 5, characterized in that: Two limiting holes (351) are provided on one side of the scraper (35). A limiting rod (353) is slidably installed on the inner surface of the limiting hole (351). The limiting rod (353) is fixedly installed in the inner cavity of the stirring chamber (1). A rotating shaft (36) is rotatably installed in the inner cavity of the stirring chamber (1). One end of the rotating shaft (36) passes through the side wall of the stirring chamber (1) and is fixedly connected to one side of one of the pulleys (3). Several stirring blades (37) are fixedly installed on the outer surface of the rotating shaft (36).

7. A coal goaf grouting and mixing device according to claim 6, characterized in that: Four second support legs (4) are fixedly installed on the top of the mixing chamber (1). The water tank (41) is fixedly installed on the top of the four second support legs (4). A first water pump (42) is fixedly installed at the bottom of the water tank (41). A first water pipe (43) is fixedly connected to the bottom of the first water pump (42). Four nozzles (44) are evenly fixedly connected to the bottom of the first water pipe (43). The four nozzles (44) penetrate into the inner cavity of the mixing chamber (1). A water supply pipe (411) is fixedly installed on the top of the water tank (41).

8. A coal goaf grouting and mixing device according to claim 7, characterized in that: A second water pump (45) is fixedly installed on the top of the water tank (41). A second water pipe (46) is fixedly connected to the top of the second water pump (45). One end of the second water pipe (46) extends into the inner cavity of the crushing box (51). The bottom of the second water pump (45) extends into the inner cavity of the water tank (41). Four third support legs (5) are fixedly installed on the bottom of the crushing box (51), two of which are fixedly installed on the outer surface of the stirring chamber (1).

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