Coal mine goaf filler prefabricating device

Abstract

The invention relates to the technical field of coal mine filling, and discloses a coal mine goaf filler prefabricating device which comprises a shell and a support, a discharging pipe is arranged at the bottom of the shell, a main shaft is rotationally connected to the center area in the shell, and the bottom of the main shaft penetrates through the shell and is connected with a driving part; a plurality of stirring blades are arranged on the surface, located in the shell, of the main shaft, the top of the main shaft penetrates through the shell and is connected with a feeding disc, the feeding disc is communicated to the interior of the main shaft, and the material spreading plate is connected with the shell through a plurality of fixing rods. A movable assembly used for evenly spreading slurry on the surface of the material spreading plate and a material spraying assembly used for evenly spraying aggregate on the slurry on the surface of the material spreading plate are installed on the surface of the main shaft, and the movable assembly is arranged in the main shaft. The problem that in the prior art, aggregate and gelling slurry are distributed unevenly after being combined is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine filling, in particular to a coal mine goaf filling pre-fabrication device. BACKGROUND

[0002] In the process of coal mining, goaf filling is a key technology to ensure mine safety and ecological restoration. Currently, waste rock, tailings, fly ash and other materials are used as fillers in coal mines, and cementitious paste is formed by pre-fabrication and mixing to achieve efficient transportation and stable filling.

[0003] Traditional pre-fabrication process usually mixes and stirs aggregates and cementitious materials directly. Although this method is simple to operate, its limitations gradually become apparent as the requirements for filling body strength and durability continue to increase.

[0004] Currently, in the actual pre-fabrication process of fillers, the cementitious paste and aggregates are prone to insufficient adhesion. Since the aggregates are directly poured into the cementitious paste (such as cement paste) during stirring, the aggregates are unevenly distributed in the cementitious paste. In addition, the surface of the aggregates is smooth, and there is not enough contact time during stirring, so the adhesion between the two is weak. This causes the interface bonding area of the filling body to become a weak point, which can easily lead to a decrease in overall strength and deformation cracking. SUMMARY

[0005] The purpose of the present application is to provide a coal mine goaf filling pre-fabrication device to solve the problems raised in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a coal mine goaf filling pre-fabrication device, comprising a shell and a support, the bottom of the shell is provided with a discharge pipe, the inside center area of the shell is rotatably connected with a main shaft, the bottom of the main shaft penetrates the shell and is connected with a driving member, the surface of the main shaft inside the shell is provided with a plurality of stirring blades, the top of the main shaft penetrates the shell and is connected with a feeding disc, and the feeding disc is connected to the inside of the main shaft. It also includes a spreading plate connected to the shell by a plurality of fixed rods, and an active assembly installed on the surface of the main shaft for spreading the paste evenly on the surface of the spreading plate. A material spraying assembly for evenly spreading aggregates on the paste on the surface of the spreading plate is provided in the main shaft.

[0007] Preferably, the spreading plate is in the shape of an inclined circular ring, which gradually inclines downward from the direction close to the inner wall of the shell to the direction close to the main shaft, and the inner diameter of the spreading plate is greater than the outer diameter of the main shaft, and the outer diameter of the spreading plate is less than the inner diameter of the shell.

[0008] Preferably, the movable assembly comprises a feeding pipe fixedly connected to the surface of the main shaft, one end of the feeding pipe is fixedly connected with a movable box matched with the spreading plate, the movable box is fixedly connected with a discharging block, the bottom of the discharging block is provided with a plurality of discharging heads, and the feeding pipe is in communication with the inside of the main shaft, the inside of the discharging block and the discharging heads respectively. The application also comprises a pushing member for pushing the slurry out of the surface of the spreading plate.

[0009] Preferably, the material spraying assembly comprises an aggregate pipe arranged in the main shaft, the bottom of the aggregate pipe penetrates through the main shaft and is fixedly connected with a material spraying opening, and the top of the aggregate pipe is rotationally connected with a rotary joint.

[0010] Preferably, the pushing member comprises an inner pushing plate and an outer pushing plate hingedly connected in the movable box, the inner pushing plate and the outer pushing plate are both hingedly connected in the movable box, when the main shaft rotates clockwise, the inner pushing plate pushes the slurry on the surface of the spreading plate out from the direction close to the main shaft, and when the main shaft rotates counterclockwise, the outer pushing plate pushes the slurry on the surface of the spreading plate out from the direction away from the main shaft.

[0011] Preferably, the movable box is fixedly connected with a blocking ring matched with the spreading plate on the side close to the main shaft, the surface of the blocking ring is provided with a material passing hole for the slurry to pass through, the inner wall of the material passing hole is hingedly connected with a blocking plate, and the surface of the blocking plate is fixedly connected with an arc-shaped plate.

[0012] Preferably, the application further comprises a buffering assembly, the buffering assembly comprises a material buffering plate fixedly connected to the inner wall of the shell, and after the slurry on the surface of the spreading plate is pushed out from the side away from the main shaft, the slurry will fall on the surface of the material buffering plate, thereby delaying the falling time.

[0013] Preferably, the buffering assembly comprises a spiral plate fixedly connected to the inner wall of the shell, and the surface of the spiral plate is fixedly connected with a guide plate.

[0014] Preferably, the driving member comprises a motor fixedly connected to the outer surface of the shell, the output end of the motor is fixedly connected with a driving wheel, the bottom of the main shaft is fixedly connected with a driven wheel, and the driving wheel and the driven wheel are in transmission with a synchronous belt.

[0015] Compared with the prior art, the application has the following beneficial effects: The application can spread the cementitious slurry on the surface before mixing and stirring the cementitious slurry and the aggregate, spray the aggregate on the surface of the slurry, increase the contact area and interface uniformity, fully mix the cementitious slurry and the aggregate, solve the problem of uneven distribution of the aggregate and the cementitious slurry in the prior art, and then push the mixed slurry into the lower part for uniform stirring by the stirring blades, thereby effectively improving the bonding force and overall strength of the cementitious slurry and the aggregate.

[0016] The present application sets up the inner push plate and the outer push plate, according to the bonding strength and bonding time of the slurry and the aggregate, the slurry mixture which is bonded more easily and has shorter time is directly pushed to the bottom stirring through the inner push plate, and the slurry mixture which is bonded inconveniently and has longer time is pushed out through the outer push plate by reversing the main shaft, the mixing time is prolonged through the buffer assembly, and the mixing of the next batch of slurry aggregate is not affected, the prefabrication efficiency of the filler is improved to a certain extent.

[0017] The present application sets up the buffer assembly, effectively prolongs the pre-mixing time of the aggregate and the cementitious slurry before stirring, effectively improves the bonding force between the two, and lays a solid foundation for the strength of the subsequent filler. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall structure schematic diagram of the present application; Figure 2 It is the top view of the overall structure of the present application; Figure 3 It is the sectional view for showing the internal structure of the shell of the present application; Figure 4 It is the sectional view for showing another embodiment of the buffer assembly of the present application; Figure 5 It is the sectional view for showing the internal structure of the main shaft and the structure near it of the present application; Figure 6 It is the sectional view for showing the internal structure of the movable box of the present application; Figure 7 It is the schematic diagram for showing the connection relationship between the movable box and the retaining ring of the present application.

[0019] In the figure: 1, shell; 11, support; 12, discharge pipe; 2, main shaft; 21, motor; 211, driving wheel; 212, synchronous belt; 213, driven wheel; 214, stirring blade; 22, feeding disc; 23, feeding pipe; 231, movable box; 232, discharge block; 233, discharge head; 234, inner push plate; 235, outer push plate; 24, retaining ring; 241, material passage; 242, baffle; 243, arc plate; 25, aggregate pipe; 251, rotary joint; 252, material injection port; 3, material spreading plate; 31, fixed rod; 4, material buffer plate; 41, spiral plate; 411, guide plate. DETAILED DESCRIPTION

[0020] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0021] The present application discloses a kind of coal mine goaf filling precast device, as shown in Fig. Figures 1-3 It includes shell 1 and support 11, the bottom of shell 1 is provided with discharge pipe 12, discharge pipe 12 is communicated with the inside of shell 1, for leading out slurry filling after stirring precast, and discharge pipe 12 is connected with external storage device or shotcreting device, slurry filling is stored or directly used for filling, the central region of the inside of shell 1 is rotatably connected with main shaft 2, the bottom of main shaft 2 penetrates shell 1, and is connected with driving part, driving part is used to drive main shaft 2 rotation, main shaft 2 is coaxially arranged with shell 1, the surface of main shaft 2 in shell 1 is provided with a plurality of stirring blades 214, stirring blade 214 is located at lower position in the inside of shell 1, the top of main shaft 2 penetrates shell 1, and is connected with feeding disc 22, feeding disc 22 is communicated to the inside of main shaft 2, feeding disc 22 is funnel-shaped, can send cement paste from feeding disc 22 into main shaft 2, cement paste can be cement slurry, the concentration of specific cement slurry is selected according to the filling parameter of precast, also includes spreading board 3, spreading board 3 is arranged above a plurality of stirring blades 214, spreading board 3 is connected with shell 1 by a plurality of fixed rods 31, the two ends of fixed rod 31 are fixedly connected with spreading board 3 and shell 1 respectively, spreading board 3 is suspended and arranged above stirring blade 214 by fixed rod 31, the surface of main shaft 2 is installed with movable assembly for spreading slurry on the surface of spreading board 3, and spraying assembly for spraying aggregate on the surface of slurry on spreading board 3.

[0022] Specifically, the slurry entering the inside of main shaft 2 is spread on the surface of spreading board 3 by movable assembly, the thickness of spread slurry is correspondingly reduced, which facilitates spraying assembly to uniformly spray the aggregate to be mixed on the surface of slurry, so as to strengthen the mixing contact area of aggregate and slurry, and improve the bonding force of both before stirring.

[0023] Further, spreading board 3 is inclined circular ring, which gradually inclines downward from the direction close to the inner wall of shell 1 to the direction close to main shaft 2, and is funnel-shaped with open bottom, and the inner diameter of spreading board 3 is greater than the outer diameter of main shaft 2, and the outer diameter of spreading board 3 is less than the inner diameter of shell 1, so that there is a certain interval between spreading board 3 and main shaft 2 and between spreading board 3 and the inner wall of shell 1, which facilitates the mixed slurry to pass through and fall into the chamber of shell 1 at the bottom, and is stirred by stirring blade 214 driven by main shaft 2.

[0024] As Figure 5 , Figure 6 and Figure 7 shown, in this embodiment, the movable assembly includes a feeding pipe 23 fixedly connected to the surface of the main shaft 2, one end of the feeding pipe 23 is fixedly connected with a movable box 231 matched with the spreading plate 3, the movable box 231 is matched with the inclined surface shape of the spreading plate 3, and is close to the surface of the spreading plate 3, a discharging block 232 is fixedly connected in the movable box 231, the discharging block 232 is fixedly connected with the feeding pipe 23, a plurality of discharging heads 233 are arranged at the bottom of the discharging block 232, the feeding pipe 23 is communicated with the inside of the main shaft 2, the inside of the discharging block 232 and the discharging heads 233 respectively, and the pushing member for pushing the slurry out of the surface of the spreading plate 3 is further included.

[0025] Specifically, through the setting of the feeding pipe 23, the slurry in the main shaft 2 is conveniently guided out, and through the discharging block 232, the slurry is sent to the surface of the spreading plate 3 by the plurality of discharging heads 233, and in the process of continuous rotation of the main shaft 2, the feeding pipe 23 can be synchronously rotated, so that the plurality of discharging heads 233 can coat the slurry on the surface of the spreading plate 3 in a circumferential motion mode with different diameters, and after the aggregate is sprayed on the surface of the slurry by the spraying assembly, the mixed slurry is pushed out by the pushing member and falls into the bottom of the shell 1 for stirring.

[0026] The spraying assembly includes an aggregate pipe 25 penetrating in the main shaft 2, the aggregate pipe 25 is coaxially arranged with the main shaft 2, the bottom of the aggregate pipe 25 penetrates the main shaft 2, and it should be noted that the bottom of the aggregate pipe 25 is inserted and penetrated from one side of the main shaft 2 after a certain bending, one end of the bottom of the aggregate pipe 25 located outside the main shaft 2 is fixedly connected with a spraying port 252, the spraying port 252 is a sand blasting port, the diameter of the sand blasting port is selected according to the particle size of the selected aggregate particles, so as to conveniently uniformly spray the aggregate, and a rotary joint 251 is rotatably connected to the top of the aggregate pipe 25, the rotary joint 251 is connected with an external aggregate conveying pump outlet device, since the rotary joint 251 is rotatably connected with the aggregate pipe 25, under the premise that the aggregate can enter the bottom of the aggregate pipe 25 through the rotary joint 251, the relative rotation between the aggregate pipe 25 and the rotary joint 251 can be ensured when the aggregate pipe 25 rotates with the main shaft 2, so as to avoid the rotation of the rotary joint 251 and ensure the stability of the rotary joint 251.

[0027] Specifically, by the arrangement of the aggregate pipe 25, the aggregate pumped out by the external pump-out device enters the aggregate pipe 25 through the rotary joint 251, and then is uniformly sprayed on the surface of the slurry evenly spread on the surface of the spreading plate 3 through the spraying port 252, so that the aggregate is uniformly mixed with the slurry. With the rotation of the main shaft 2, the aggregate pipe 25 and the spraying port 252 also rotate, and then the aggregate is uniformly sprayed in a circular direction. It is worth noting that the arrangement position of the spraying port 252 on the surface of the main shaft 2 is opposite to that of the feeding pipe 23 on the surface of the main shaft 2. The two are opposite to each other at an angle of 180 degrees with the main shaft 2 as the center, so as to avoid the conflict between the spraying port 252 and the feeding pipe 23.

[0028] As shown in Figure 5 , Figure 6 and Figure 7 , in the present embodiment, the pushing member includes an inner pushing plate 234 and an outer pushing plate 235 hingedly arranged in the movable box 231. The inner pushing plate 234 and the outer pushing plate 235 are both hingedly arranged in the movable box 231. When the main shaft 2 rotates clockwise, the inner pushing plate 234 pushes the slurry on the surface of the spreading plate 3 from the direction close to the main shaft 2. When the main shaft 2 rotates counterclockwise, the outer pushing plate 235 pushes the slurry on the surface of the spreading plate 3 from the direction away from the main shaft 2. The pushing member further includes a buffer assembly for delaying the falling time of the slurry.

[0029] The movable box 231 is fixedly connected with a blocking ring 24 adapted to the spreading plate 3 on the side close to the main shaft 2. The blocking ring 24 is used to block the slurry on the inclined bottom surface of the spreading plate 3, so as to avoid the slurry from naturally sliding from the lower end of the spreading plate 3 due to gravity when the aggregate is spread and mixed. The surface of the blocking plate 242 is provided with a material passing hole 241 for the slurry to pass through. The material passing hole 241 is adapted to the inner pushing plate 234. The slurry pushed by the inner pushing plate 234 is discharged from the material passing hole 241 and falls to the bottom of the housing 1. The inner wall of the material passing hole 241 is hingedly connected with the blocking plate 242. The surface of the blocking plate 242 is fixedly connected with an arc-shaped plate 243. Through the arrangement of the blocking plate 242, the material passing hole 241 can be effectively blocked when the rotating shaft rotates counterclockwise and the inner pushing plate 234 does not push the material. The slurry is prevented from being discharged from the material passing hole 241. Since the surface of the blocking plate 242 is provided with the arc-shaped plate 243, when the main shaft 2 rotates clockwise, the inner arc surface of the arc-shaped plate 243 contacts the slurry on the surface of the spreading plate 3. Resistance is generated on the arc-shaped inner surface, so as to drive the blocking plate 242 to rotate and unfold, and expose the material passing hole 241. On the contrary, when the main shaft 2 rotates counterclockwise, the outer arc surface of the arc-shaped plate 243 on the surface of the blocking plate 242 contacts the slurry on the surface of the spreading plate 3. Resistance is generated on the arc-shaped outer surface, so as to drive the blocking plate 242 to rotate back to normal and completely block the material passing hole 241 to prevent the slurry from passing through.

[0030] By setting the inner push plate 234 and the outer push plate 235, the mixed slurry on the surface of the spreading plate 3 can be pushed out when the main shaft 2 rotates, and falls to the bottom of the shell 1, so as to further stir. Specifically, there are two cases: First, when the water content in the slurry is large, the fluidity of the slurry is strong, and the aggregate sprayed on the surface can be mixed more easily. At this time, the aggregate can be bonded and mixed after a short time after spraying, so the main shaft 2 can rotate clockwise, so that the inner push plate 234 can push the mixed slurry towards the main shaft 2 in time, and the slurry can be pushed down from the gap between the spreading plate 3 and the main shaft 2 and fall to the bottom for stirring.

[0031] Second, when the water content in the slurry is small, the fluidity of the slurry is poor, and the aggregate sprayed on the surface is difficult to be lubricated and dispersed to complete the mixing, so the main shaft 2 can rotate counterclockwise. At this time, the outer push plate 235 pushes the mixed or not fully mixed slurry towards the main shaft 2, that is, towards the inner wall of the shell 1, and pushes the slurry down from the gap between the spreading plate 3 and the main shaft 2. The speed of the slurry falling is only delayed by the buffer assembly, and after sufficient mixing, the slurry falls to the bottom for stirring.

[0032] The discharge block 232 and the discharge port are arranged between the inner push plate 234 and the outer push plate 235. When the inner push plate 234 or the outer push plate 235 pushes the mixed slurry, the discharge port between the inner push plate 234 and the outer push plate 235 can simultaneously discharge new slurry. The two processes are performed simultaneously to ensure the efficiency of slurry mixing.

[0033] It is worth noting that the inner push plate 234 and the outer push plate 235 are both hinged to the surface of the movable box 231. The movable box 231 can be provided with a protrusion for limiting the inner push plate 234 and the outer push plate 235. The inner push plate 234 and the outer push plate 235 cannot rotate towards the inside of the movable box 231, but can only rotate outward. When the main shaft 2 rotates clockwise, the inner push plate 234 is tightly attached to the protrusion due to the resistance of the slurry, and does not rotate, thereby pushing the slurry towards the main shaft 2. At this time, the outer push plate 235 is also subjected to resistance, but the resistance is outward, so that the outer push plate 235, which is not blocked on the outside, rotates away from the movable box 231. This can evenly spread the slurry on the surface of the spreading plate 3 through the outward rotation of the outer push plate 235. Conversely, the counterclockwise rotation of the main shaft 2 can also position the outer push plate 235 and extend the inner push plate 234.

[0034] In one embodiment, as Figure 3As shown, the buffer assembly includes a buffer plate 4 fixedly connected to the inner wall of the shell 1, the surface of the buffer plate 4 also has an inclination, and the surface has a certain roughness, which facilitates the retention of the slurry and the full mixing of the slurry and the aggregate. After the slurry on the surface of the spreading plate 3 is pushed out from the side away from the main shaft 2, it will fall on the surface of the buffer plate 4, delaying the falling time. Then, the slurry with the delayed falling time will naturally fall from the surface of the buffer plate 4 to the bottom and be further mixed by the stirring blade 214 driven by the rotation of the main shaft 2.

[0035] In one parallel embodiment, as shown in the drawings, Figure 4 The buffer assembly includes a spiral plate 41 fixedly connected to the inner wall of the shell 1, and the surface of the spiral plate 41 has a certain roughness. The spiral plate 41 is fixedly connected with a guide plate 411. By arranging the spiral plate 41, the falling speed and time of the slurry are further delayed. The slurry falling on the surface of the spiral plate 41 will gradually slide down along the spiral surface, effectively delaying the falling time. The guide plate 411 can limit the slurry to avoid direct falling from one side of the spiral plate 41.

[0036] The driving member includes a motor 21 fixedly connected to the outer surface of the shell 1. The output end of the motor 21 is fixedly connected with a driving wheel 211. The bottom of the main shaft 2 is fixedly connected with a driven wheel 213. The driving wheel 211 and the driven wheel 213 are in transmission with a synchronous belt 212. The output of the motor 21 drives the driving wheel 211 to rotate, and then cooperates with the transmission synchronous belt 212 to make the driven wheel 213 also rotate and drive the main shaft 2 to rotate. The rotary connection between the main shaft 2 and the shell 1 is sealed to avoid leakage of the slurry.

[0037] The contents not described in detail in the description belong to the prior art known to those skilled in the art. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements for part of the technical features, as long as they are within the spirit and principles of the present application. Any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the present application.

Claims

1. A coal mine goaf filling prefabrication device, comprising a shell (1) and a bracket (11), wherein a discharge pipe (12) is provided at the bottom of the shell (1), characterized in that: The central area inside the shell (1) is rotatably connected to a main shaft (2), the bottom of the main shaft (2) passes through the shell (1) and is connected to a driving member, a surface of the main shaft (2) located inside the shell (1) is provided with a plurality of stirring blades (214), the top of the main shaft (2) passes through the shell (1) and is connected to a feeding tray (22), and the feeding tray (22) is connected to the inside of the main shaft (2); It also includes a spreading plate (3), the spreading plate (3) being connected to the housing (1) via a plurality of fixing rods (31), and a movable component for evenly spreading the slurry on the surface of the spreading plate (3) being installed on the surface of the main shaft (2); A spraying assembly for evenly sprinkling aggregate onto the slurry on the surface of the spreading plate (3) is arranged in the main shaft (2).

2. The coal mine goaf filling prefabrication device according to claim 1, characterized in that: The spreading plate (3) is in the shape of an inclined circular ring, and gradually tilts downward from the direction close to the inner wall of the shell (1) toward the direction close to the main shaft (2), and the inner diameter of the spreading plate (3) is larger than the outer diameter of the main shaft (2), and the outer diameter of the spreading plate (3) is smaller than the inner diameter of the shell (1).

3. The coal mine goaf filling prefabrication device according to claim 1, characterized in that: The movable assembly comprises a feed pipe (23) fixedly connected to the surface of the main shaft (2), one end of the feed pipe (23) is fixedly connected to a movable box (231) adapted to the spreading plate (3), a discharge block (232) is fixedly connected inside the movable box (231), a plurality of discharge heads (233) are provided at the bottom of the discharge block (232), and the feed pipe (23) is respectively connected to the inside of the main shaft (2), the inside of the discharge block (232) and the discharge head (233); It also includes a pushing member for pushing the slurry out from the surface of the spreading plate (3).

4. The coal mine goaf filling prefabrication device according to claim 1, characterized in that: The spraying assembly comprises an aggregate tube (25) passing through the main shaft (2); the bottom of the aggregate tube (25) passes through the main shaft (2) and is fixedly connected to a spraying port (252); and the top of the aggregate tube (25) is rotatably connected to a rotary joint (251).

5. The coal mine goaf filling prefabrication device according to claim 3, characterized in that: The pushing member comprises an inner push plate (234) and an outer push plate (235) hinged in the movable box (231). The inner push plate (234) and the outer push plate (235) are both hinged in an inclined manner in the movable box (231). When the main shaft (2) rotates clockwise, the inner push plate (234) pushes the slurry on the surface of the spreading plate (3) from a direction close to the main shaft (2). When the main shaft (2) rotates counterclockwise, the outer push plate (235) pushes the slurry on the surface of the spreading plate (3) from a direction away from the main shaft (2).

6. The coal mine goaf filling prefabrication device according to claim 5, characterized in that: A baffle ring (24) adapted to the spreading plate (3) is fixedly connected to one side of the movable box (231) close to the main shaft (2), a through hole (241) for slurry to pass through is provided on the surface of the baffle (242), a baffle (242) is hingedly connected to the inner wall of the through hole (241), and an arc-shaped plate (243) is fixedly connected to the surface of the baffle (242).

7. A coal mine goaf filling prefabrication device according to any one of claims 1 to 6, characterized in that: It also includes a buffer component, which includes a buffer plate (4) fixedly connected to the inner wall of the shell (1). After the slurry on the surface of the spreading plate (3) is pushed out from the side away from the main shaft (2), it will fall on the surface of the buffer plate (4), delaying its falling time.

8. The coal mine goaf filling prefabrication device according to claim 7, characterized in that: The buffer assembly comprises a spiral plate (41) fixedly connected to the inner wall of the housing (1), and a guide plate (411) is fixedly connected to the surface of the spiral plate (41).

9. The coal mine goaf filling prefabrication device according to claim 1, characterized in that: The driving member comprises a motor (21) fixedly connected to the outer surface of the housing (1); an output end of the motor (21) is fixedly connected to a driving wheel (211); a bottom of the main shaft (2) is fixedly connected to a driven wheel (213); and a synchronous belt (212) is transmitted between the driving wheel (211) and the driven wheel (213).

Images