Wet-type concrete guniting device for underground roadway of coal mine

Abstract

The invention discloses a coal mine underground roadway wet-type concrete guniting device which comprises a supporting base with a roller structure, an aggregate box and a solid pump are fixedly installed on the upper surface of the supporting base, the solid pump communicates with the aggregate box through a feeding pipe, and the solid pump and a conveying pipe are installed in a butt joint mode through a discharging pipe. A slurry spraying head is fixedly installed at the top end of the conveying pipe, a pressurizing mechanism is arranged in the discharging pipe, the pressurizing mechanism sprays pressurized air to dredge blockage in the discharging pipe, and a mixing pipe is fixedly installed at the front end of the conveying pipe. According to the wet-type concrete guniting device for the underground coal mine roadway, the novel structural design is adopted, air in the aggregate box is pumped out through cooperation of the air pump and the negative pressure pipe, negative pressure is formed in the aggregate box at the moment, dust is prevented from overflowing under the action of the negative pressure, and the pumped-out air enters the upper space in the storage box and is pressurized; and then the electromagnetic valve is opened, so that air is sprayed out through the pressurizing mechanism, and the purpose of dredging the interior of the discharging pipe is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mine tunnel shotcreting, in particular to a wet concrete shotcreting device for underground mine tunnels. BACKGROUND

[0002] Mine tunnel shotcreting is a key support and reinforcement technology for spraying a concrete layer on the surface of the surrounding rock of a tunnel in the process of mine construction and production. Specialized spraying machinery is used to transport concrete mixture (cement, sand, stone, accelerator, etc.) mixed in a certain proportion through a pipeline and spray it at high speed onto the surface of the surrounding rock of the tunnel, thereby quickly setting and hardening to form a support layer.

[0003] For example, in the prior art, a patent with the application number CN202110638896.6 discloses a tunnel wet shotcreting method, which relates to the field of coal mine tunneling, and includes: mixing raw materials on the ground and loading them into a slurry container after uniform mixing; transporting the slurry container containing the slurry from the ground to the underground work site of the coal mine; pouring the slurry from the slurry container into a shotcreting machine; starting the shotcreting machine, and the nozzle of the shotcreting machine sprays the slurry at an elevation angle of 10° to 15° to the sprayed surface of the tunnel. The dry cement, sand, gravel, and primary accelerator are fully mixed in the automatic metering and mixing equipment on the ground, and are loaded into the slurry container after uniform mixing. The slurry container is transported to the underground work site using a mine car. When in use, the slurry in the slurry container is poured into the mixer and mixed with water and secondary accelerator, and then the nozzle of the shotcreting machine is used to perform wet work at an elevation angle of 10° to 15°.

[0004] For another example, in the prior art, a patent with the application number CN202110217151.2 discloses a coal mine tunnel robot shotcreting method and device, which includes a chassis, a first transmission shaft, a first rotating shaft, a second transmission box, a limiting sleeve, and a fifth electric push rod. The first transmission box is connected below the chassis, and a first motor is installed inside the first transmission box. A first transmission belt is provided on the first motor. A transmission roller is fixed on the first transmission shaft. A searchlight, a monitor, a distance sensor, an antenna, a first scraper, a second scraper, and a third scraper are provided. The device can be controlled by receiving signals emitted by a mobile terminal through the antenna.

[0005] For example, in the prior art, a coal mine roadway spraying device with application No. CN201910124258.5 is disclosed, which belongs to the technical field of spraying equipment and comprises a vehicle frame and a spraying mechanism. The top of the vehicle frame is provided with a material turning mechanism, a material conveying mechanism and a position adjusting mechanism. The position adjusting mechanism comprises an angle adjusting assembly and a rotating assembly. The bottom of the vehicle frame is provided with four running wheels. The spraying mechanism comprises a rotating table, a rotating arm, a material extending assembly and a material removing assembly. The top of the rotating table is provided with a fixing seat and a mounting seat. A hydraulic cylinder is arranged on the fixing seat. The output end of the hydraulic cylinder is hingedly connected with one end of the rotating arm. The material removing assembly can be used to remove small stones after blasting in a small space.

[0006] In combination with the above-mentioned material, it can be seen that in the prior art, in order to reduce dust in the working process, a wet spraying method can be used. However, in actual use, the wet spraying method needs to add water in the aggregate in advance, and the material as a whole will form a certain viscosity, which is easy to cause blockage. SUMMARY

[0007] The purpose of the present application is to provide a coal mine underground roadway wet concrete spraying device to solve the problem of easy blockage of wet spraying in the background art.

[0008] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a coal mine underground roadway wet concrete spraying device, comprising a support base with a roller structure, a aggregate box and a solid pump are fixedly installed on the upper surface of the support base, the solid pump is in communication with the aggregate box through a feeding pipe, and the solid pump is butt-jointed with a conveying pipe through a discharging pipe, the aggregate is conveyed into the conveying pipe through the feeding pipe and the discharging pipe of the solid pump, a spraying head is fixedly installed at the top end of the conveying pipe, a pressurizing mechanism is arranged in the discharging pipe, the pressurizing mechanism sprays pressurized air to unblock the inside of the discharging pipe, a mixing pipe is fixedly installed at the front end of the conveying pipe, and helical strips are fixedly arranged on the inner wall of the mixing pipe in a uniform manner, the material is guided to rotate by the helical strips, so that a better mixing effect is achieved, the concrete aggregate and the liquid additive are mixed in the mixing pipe, the additive (such as a quick-setting agent, etc.) in the storage tank is added into the mixing pipe through an adding pipe by a liquid pump, the aggregate and the additive are mixed in the mixing pipe and then sprayed out through the spraying head, the purpose of wet spraying is achieved, and dust in the spraying process is reduced, a storage tank is fixedly installed on the upper surface of the support base, an adding pipe is installed at the bottom of the storage tank, and the adding pipe is connected with a liquid pump fixedly installed above the support base, and the front end of the adding pipe is in communication with the mixing pipe.

[0009] Preferably, a first stirring rod is horizontally arranged inside the aggregate box, and a filter cylinder for filtering dust is fixedly arranged on the inner wall of the aggregate box, the filter cylinder corresponds to the position of the negative pressure pipe fixedly arranged on the outer side wall of the aggregate box, the bottom end of the negative pressure pipe extends into the inside of the storage box, a partition plate is fixedly arranged on the upper end of the inside of the storage box, air in the aggregate box is extracted through the negative pressure pipe, and dust is filtered through the filter cylinder in the process, at this time, negative pressure is formed in the inside of the aggregate box, dust is prevented from overflowing under the action of the negative pressure, the extracted air enters the space above the inside of the storage box and is pressurized, then the electromagnetic valve is opened, so that the air is sprayed out through the pressurizing mechanism, and the purpose of dredging the inside of the discharge pipe is achieved.

[0010] Preferably, the pressurizing mechanism comprises a pressurizing nozzle fixedly arranged in the inside of the discharge pipe, the pressurizing nozzle has an annular structure as a whole, the pressurizing nozzle is communicated with the pressurizing pipe, and the pressurized air stored in the inside of the storage box is sprayed out from the pressurizing nozzle through the pressurizing pipe, the sprayed air flow blows the aggregate in the discharge pipe, and the purpose of dredging the blockage is achieved.

[0011] Preferably, the upper end of the pressurizing pipe is communicated with the upper end of the storage box, and the electromagnetic valve for controlling the opening and closing of the pressurizing pipe is arranged on the outside of the pressurizing pipe.

[0012] Preferably, the bottom end of the negative pressure pipe is provided with a shunt pipe communicated therewith, the upper end of the shunt pipe is located above the partition plate, and a one-way valve is fixedly arranged on the top end of the shunt pipe.

[0013] Preferably, a pressure relief valve is arranged at the end of the negative pressure pipe, and the position of the end of the negative pressure pipe corresponds to the position of the driving blade, when the pressure above the partition plate reaches a set value, the air in the negative pressure pipe is sprayed out from the pressure relief valve, and the sprayed air flow forms bubbles to stir the liquid additive in the storage box.

[0014] Preferably, the driving blade is rotatably arranged at the lower end of the inside of the storage box, and a second stirring rod is fixedly arranged on the upper end of the driving blade, the air flow drives the driving blade to rotate, the driving blade drives the second stirring rod to rotate, and the liquid additive is stirred again, so that the precipitation of the liquid additive is reduced.

[0015] Preferably, a connecting ring is rotatably arranged on the outside of the discharge pipe, and a turbine blade is fixedly arranged on the outside of the connecting ring, the air flow is sprayed out from the small hole arranged at the lower end of the pressurizing pipe to drive the turbine blade to rotate, when the air is transported to the pressurizing nozzle, part of the air is discharged from the hole, and the discharged air drives the connecting ring to rotate through the turbine blade.

[0016] Preferably, the inner wall of the connecting ring is fixedly provided with a first protrusion, and the first protrusion corresponds to a second protrusion fixedly provided on the outer surface of the discharge pipe; the discharged air drives the connecting ring to rotate through the turbine blade; at this time, the first protrusion of the inner wall of the connecting ring and the second protrusion on the outer surface of the discharge pipe are pressed and knocked against each other, so that the discharge pipe is vibrated to some extent, thereby reducing the adhesion of the aggregate to the inner wall of the discharge pipe.

[0017] Compared with the prior art, the coal mine underground roadway wet concrete spraying device has the beneficial effects that: the coal mine underground roadway wet concrete spraying device adopts a novel structure design, and specific contents are as follows: 1. The aggregate mixed with water is poured into the aggregate box, and then the solid pump is used to convey the aggregate to the conveying pipe through the feeding pipe and the discharge pipe, while the liquid pump is opened to add the additive (such as a quick-setting agent) in the storage box to the mixing pipe through the filling pipe, the aggregate and the additive are mixed in the mixing pipe, and then sprayed out through the spraying head, so that the purpose of wet spraying is achieved, and the dust in the spraying process is reduced. Further, the air in the aggregate box is extracted through the air pump and the negative pressure pipe, at this time, a negative pressure is formed in the inside of the aggregate box, and the dust is prevented from overflowing under the action of the negative pressure, the extracted air enters the upper space in the inside of the storage box and is pressurized, and then the electromagnetic valve is opened to make the air sprayed out through the pressurizing mechanism, so that the purpose of dredging the inside of the discharge pipe is achieved. Further, the pressurizing mechanism is a squeezing nozzle fixedly installed in the inside of the discharge pipe, the pressurized air stored in the inside of the storage box is sprayed out from the squeezing nozzle through the pressurizing pipe, the sprayed air flow blows the aggregate in the discharge pipe, and the purpose of dredging the blockage is achieved.

[0018] 2. The end of the negative pressure pipe is provided with a pressure relief valve, when the pressure above the partition plate reaches a set value, the air in the negative pressure pipe is sprayed out from the pressure relief valve, the sprayed air flow forms bubbles to stir the liquid additive in the storage box, and the air flow drives the driving blade to rotate, the driving blade drives the second stirring rod to rotate, and the liquid additive is stirred again, so that the precipitation of the liquid additive is reduced.

[0019] 3. The lower end of the pressurizing pipe is provided with a small hole, when the air is conveyed to the pressurizing nozzle, part of the air is discharged from the hole, the discharged air drives the connecting ring to rotate through the turbine blade, at this time, the first protrusion of the inner wall of the connecting ring and the second protrusion on the outer surface of the discharge pipe are pressed and knocked against each other, so that the discharge pipe is vibrated to some extent, thereby reducing the adhesion of the aggregate to the inner wall of the discharge pipe. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application; Figure 2 It is a schematic diagram of the internal structure of the aggregate box of the present application; Figure 3It is the inside structure schematic view of the mixing pipe of the present application; Figure 4 It is the inside structure schematic view of the storage box of the present application; Figure 5 It is the connecting relationship structure schematic view of the solid pump and the conveying pipe of the present application; Figure 6 It is the inside structure schematic view of the discharging pipe of the present application; Figure 7 It is the inside structure schematic view of the discharging pipe of the present application; Figure 6 It is the enlarged structure schematic view of A in the present application; Figure 8 It is the connecting relationship structure schematic view of the negative pressure pipe and the shunt pipe of the present application; Figure 9 It is the structure schematic view of the second stirring rod of the present application; Figure 10 It is the structure schematic view of the connecting ring of the present application.

[0021] In the figure: 1, support base; 2, aggregate box; 3, solid pump; 4, feeding pipe; 5, discharging pipe; 6, conveying pipe; 7, shotcrete head; 8, storage box; 9, filling pipe; 10, liquid pump; 11, mixing pipe; 12, spiral strip; 13, first stirring rod; 14, filter cartridge; 15, negative pressure pipe; 16, partition plate; 17, shunt pipe; 18, one-way valve; 19, pressure relief valve; 20, pressurizing pipe; 21, pressurizing spray head; 22, electromagnetic valve; 23, driving blade; 24, second stirring rod; 25, connecting ring; 26, turbine blade; 27, first convex strip; 28, second convex strip. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0023] Embodiment one: please refer to Figures 1-5The embodiment provides the following technical scheme for the purpose of wet spraying, and specifically discloses the following: a supporting base 1 with a roller structure, a aggregate box 2 and a solid pump 3 are fixedly installed on the upper surface of the supporting base 1, the solid pump 3 is communicated with the aggregate box 2 through a feeding pipe 4, the solid pump 3 is butt-joint installed with a conveying pipe 6 through a discharging pipe 5, a mixing pipe 11 is fixedly installed at the front end of the conveying pipe 6, spiral strips 12 that are uniformly arranged are fixedly arranged on the inner wall of the mixing pipe 11, concrete aggregate and liquid additives are mixed in the mixing pipe 11, a storage box 8 is fixedly installed on the upper surface of the supporting base 1, a filling pipe 9 is installed at the bottom of the storage box 8, the filling pipe 9 is connected with a liquid pump 10 that is fixedly installed above the supporting base 1, the front end of the filling pipe 9 is communicated with the mixing pipe 11, a first stirring rod 13 that is transversely arranged is rotatably installed in the aggregate box 2, and a filter cylinder 14 for filtering dust is fixedly installed on the inner wall of the aggregate box 2.

[0024] In use of the device, first, the aggregate preliminarily mixed with water is put into the aggregate box 2, when spraying is needed, the conveying pipe 6 is lifted by the worker, the spraying head 7 is aimed at the inner wall of the roadway, then the solid pump 3 is started, under the action of the solid pump 3, the concrete aggregate in the aggregate box 2 is conveyed into the conveying pipe 6 through the feeding pipe 4 and the discharging pipe 5, at the same time, the liquid pump 10 is started, under the action of the liquid pump 10, the liquid additives (such as a quick-setting agent, etc.) in the storage box 8 are conveyed into the mixing pipe 11 through the filling pipe 9, at this time, the concrete aggregate and the additives are mixed in the mixing pipe 11, the material is guided to rotate through the spiral strips 12, better mixing effect is achieved, finally, the concrete is sprayed out of the spraying head 7, during the spraying process, the right side motor of the aggregate box 2 is started, the first stirring rod 13 is driven to rotate by the motor, and the aggregate in the aggregate box 2 is stirred.

[0025] Embodiment two: please refer to Figures 6-9, the embodiment is provided with the following technical scheme to reduce the blockage, specifically discloses that the top end of the conveying pipe 6 is fixedly installed with the shotcrete head 7, and the inside of the discharge pipe 5 is provided with a pressurizing mechanism, the pressurizing mechanism sprays pressurized air to dredge the inside of the discharge pipe 5, the filter cartridge 14 corresponds to the position of the negative pressure pipe 15 fixedly installed on the outer side wall of the aggregate bin 2, and the bottom end of the negative pressure pipe 15 extends to the inside of the storage tank 8, and the inside of the storage tank 8 is fixedly installed with the transversely arranged partition plate 16 at the upper end, the pressurizing mechanism comprises the pressurizing nozzle 21 fixedly installed in the inside of the discharge pipe 5, the pressurizing nozzle 21 is in the form of a ring as a whole, and the pressurizing nozzle 21 is in communication with the pressurizing pipe 20, the upper end of the pressurizing pipe 20 is in communication with the upper end of the storage tank 8, and the outside of the pressurizing pipe 20 is provided with the electromagnetic valve 22 for controlling the on-off thereof, the bottom end of the negative pressure pipe 15 is installed with the shunt pipe 17 in communication therewith, the upper end of the shunt pipe 17 is located above the partition plate 16, and the top end of the shunt pipe 17 is fixedly installed with the one-way valve 18, the distal end of the negative pressure pipe 15 is installed with the pressure relief valve 19, and the position of the distal end of the negative pressure pipe 15 corresponds to the position of the driving blade 23, the driving blade 23 is rotatably installed at the lower end inside the storage tank 8, and the upper end of the driving blade 23 is fixedly installed with the second stirring rod 24.

[0026] During the shotcrete process, the air pump connected with the negative pressure pipe 15 is turned on, and the air pump cooperates with the negative pressure pipe 15 to form negative pressure in the inside of the aggregate bin 2, so that the air in the inside of the aggregate bin 2 is extracted under the action of the negative pressure, and the dust in the aggregate bin 2 is prevented from overflowing, in this process, the dust is filtered by the filter cartridge 14, the extracted air flows into the shunt pipe 17 through the negative pressure pipe 15, and finally is discharged to the above of the partition plate 16 through the one-way valve 18 at the upper end of the shunt pipe 17, is stored and continuously pressurized, then the electromagnetic valve 22 is regularly turned on, when the electromagnetic valve 22 is turned on, the air stored above the partition plate 16 is conveyed to the pressurizing nozzle 21 through the pressurizing pipe 20 and is sprayed out, the sprayed pressurized airflow blows the aggregate in the inside of the discharge pipe 5, and the aggregate is prevented from being accumulated in the position of the discharge pipe 5 to cause blockage, when the air above the partition plate 16 is pressurized to a set value, due to the large air pressure in the inside of the negative pressure pipe 15, when the pressure reaches the threshold value of the pressure relief valve 19, the air is discharged from the position of the pressure relief valve 19, the discharged air forms bubbles in the additive in the inside of the storage tank 8, the additive is stirred by the bubbles, and the airflow discharged blows the driving blade 23 to rotate, the driving blade 23 drives the second stirring rod 24 to rotate, and the additive is further stirred by the second stirring rod 24 to reduce the precipitation in the additive.

[0027] Example three: please refer to Figure 10The embodiment provides the following technical scheme, and specifically discloses that a connecting ring 25 is rotatably arranged outside a discharge pipe 5, and turbine blades 26 are fixedly arranged outside the connecting ring 25; a small hole is arranged at the lower end of a pressurizing pipe 20 to spray air flow to drive the turbine blades 26 to rotate; a first convex strip 27 is fixedly arranged on the inner wall of the connecting ring 25, and the first convex strip 27 corresponds to a second convex strip 28 fixedly arranged on the outer surface of the discharge pipe 5.

[0028] Because the small hole structure is arranged at the lower end of the pressurizing pipe 20, when air is conveyed into a pressurizing nozzle 21 through the pressurizing pipe 20, a small part of the air is discharged through the small hole, and the discharged air drives the connecting ring 25 to rotate through the turbine blades 26; the first convex strip 27 on the inner wall of the connecting ring 25 is synchronously moved in the process of rotation of the connecting ring 25, at this time, the first convex strip 27 and the second convex strip 28 on the outer surface of the discharge pipe 5 are mutually extruded and knocked, and the discharge pipe 5 is vibrated under the knocking action, and the vibration reduces the adhesion of the aggregate to the inner wall of the discharge pipe 5.

[0029] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0030] Although the embodiments of the present application have been shown and described, it can be understood by those of ordinary skill in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A wet concrete spraying device for underground coal mine roadways, comprising a support base (1) with a roller structure, wherein an aggregate box (2) and a solid pump (3) are fixedly installed on the upper surface of the support base (1), characterized in that, Also includes: The solid pump (3) is connected to the aggregate box (2) through the feed pipe (4), and the solid pump (3) is connected to the conveying pipe (6) through the discharge pipe (5). The top of the conveying pipe (6) is fixedly installed with a spray nozzle (7), and the discharge pipe (5) is equipped with a pressurizing mechanism. The pressurizing mechanism sprays pressurized air to clear the blockage inside the discharge pipe (5). The front end of the conveying pipe (6) is fixedly installed with a mixing pipe (11), and the inner wall of the mixing pipe (11) is fixedly provided with uniformly arranged spiral strips (12), and the concrete aggregate and liquid additives are mixed in the mixing pipe (11). A storage tank (8) is fixedly installed on the upper surface of the support base (1), and a filling pipe (9) is installed at the bottom of the storage tank (8). The filling pipe (9) is connected to a liquid pump (10) fixedly installed above the support base (1), and the front end of the filling pipe (9) is connected to a mixing pipe (11).

2. The wet concrete spraying device for underground coal mine roadways according to claim 1, characterized in that: The aggregate bin (2) is rotatably mounted with a first stirring rod (13) arranged horizontally, and the inner wall of the aggregate bin (2) is fixedly mounted with a filter cylinder (14) for filtering dust.

3. The wet concrete spraying device for underground coal mine roadways according to claim 2, characterized in that: The filter cylinder (14) corresponds to the negative pressure pipe (15) fixedly installed on the outer wall of the aggregate box (2), and the bottom end of the negative pressure pipe (15) extends into the storage box (8), and a horizontally arranged partition plate (16) is fixedly installed at the upper end of the storage box (8).

4. A wet concrete spraying device for underground coal mine roadways according to claim 3, characterized in that: The pressurizing mechanism includes a pressurizing nozzle (21) fixedly installed inside the discharge pipe (5). The pressurizing nozzle (21) has an overall annular structure and is connected to the pressurizing pipe (20).

5. A wet concrete spraying device for underground coal mine roadways according to claim 4, characterized in that: The upper end of the pressurizing pipe (20) is connected to the upper end of the storage tank (8), and a solenoid valve (22) for controlling its on and off is provided on the outside of the pressurizing pipe (20).

6. A wet concrete spraying device for underground coal mine roadways according to claim 5, characterized in that: The bottom end of the negative pressure pipe (15) is connected to a diversion pipe (17), and the upper end of the diversion pipe (17) is located above the partition plate (16), and a one-way valve (18) is fixedly installed at the top end of the diversion pipe (17).

7. A wet concrete spraying device for underground coal mine roadways according to claim 6, characterized in that: The negative pressure pipe (15) is equipped with a pressure relief valve (19) at its end, and the position of the end of the negative pressure pipe (15) corresponds to the position of the drive blade (23).

8. A wet concrete spraying device for underground coal mine roadways according to claim 7, characterized in that: The drive blade (23) is rotatably mounted inside the lower end of the storage tank (8), and a second stirring rod (24) is fixedly mounted on the upper end of the drive blade (23).

9. A wet concrete spraying device for underground coal mine roadways according to claim 8, characterized in that: The discharge pipe (5) is rotatably mounted with a connecting ring (25), and a turbine blade (26) is fixedly mounted on the outside of the connecting ring (25). The airflow ejected from the small hole at the lower end of the pressurization pipe (20) drives the turbine blade (26) to rotate.

10. A wet concrete spraying device for underground coal mine roadways according to claim 9, characterized in that: The inner wall of the connecting ring (25) is fixedly installed with a first protrusion (27), and the first protrusion (27) corresponds to a second protrusion (28) fixedly installed on the outer surface of the discharge pipe (5).

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