Rubber powder air conveying system

Abstract

The utility model discloses a rubber powder pneumatic conveying system which comprises an impurity removal assembly, a pneumatic conveying assembly and a material storage assembly, the impurity removal assembly comprises a spiral dust falling device, the spiral dust falling device is connected with an inlet of a fan, a negative pressure discharging device is arranged at a discharging port of the spiral dust falling device, a magnetic separation device is arranged at a discharging port of the negative pressure discharging device, and a magnetic separation device is arranged at a discharging port of the magnetic separation device. A buffer tank is arranged at a discharging port of the magnetic separation device, the air conveying assembly comprises a temporary storage tank, one end of a discharging port of the temporary storage tank is connected with a first air pipe, the other end of the discharging port of the temporary storage tank is connected with a discharging pipeline, and an assisting air pipe is arranged on the periphery of the discharging pipeline in the extending direction of the discharging pipeline. The power-assisted air pipe is connected with the discharging pipeline through a plurality of one-way valves, the material storage assembly comprises a material storage tank, and an air spraying opening is formed in the bottom of the inner side of the material storage tank. The rubber powder conveying device can remove impurities from rubber powder and convey the rubber powder, can prevent blockage and caking of the rubber powder, and is beneficial to the subsequent production process of the rubber powder.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder conveying equipment technical field especially relates to a rubber powder air conveying system. BACKGROUND

[0002] Rubber powder refers to the powder like rubber material obtained by the waste rubber products after the crushing processing, and the rubber powder is generally conveyed by the air pipe conveying mode after being produced due to its small particle and light quality.

[0003] At present, the most air pipe conveying devices will be blocked in the inside when conveying the rubber powder due to the light weight and certain viscosity of the rubber powder, thereby affecting the conveying efficiency. There is a certain amount of iron powder impurities in the rubber powder, which will affect the subsequent production and utilization of the rubber powder. The rubber powder will be agglomerated when being temporarily stored, which will also affect the production process of the rubber powder. UTILITY MODEL CONTENTS

[0004] The utility model discloses a rubber powder air conveying system, which can remove impurities and convey rubber powder, prevent blockage and agglomeration, and facilitate the subsequent production process of rubber powder.

[0005] To achieve the above object and other related objects, the utility model provides a kind of powder air conveying system, it includes: impurity removal subassembly, air conveying subassembly and storage component, the impurity removal subassembly includes one or more spiral dust catcher, the top of each spiral dust catcher is connected with the import of a fan by pipeline, the discharge port of each spiral dust catcher is equipped with a negative pressure unloading device, the discharge port of each negative pressure unloading device is equipped with a magnetic separation device, the impurity outlet of each magnetic separation device is connected with the import of first conveying device, the discharge port of each magnetic separation device is equipped with a buffer tank, and the discharge port of the buffer tank is connected with the import of second conveying device;The air conveying subassembly includes temporary storage tank, and the feed inlet of the temporary storage tank is connected with the outlet of the second conveying device, and one end of the discharge port of the temporary storage tank is connected with first air pipe, and the other end of the discharge port of the temporary storage tank is connected with discharge pipeline, and the periphery of the discharge pipeline is equipped with booster air pipe along the extension direction of the discharge pipeline, and the booster air pipe is connected with the discharge pipeline by a plurality of one-way valves, and the direction of a plurality of the one-way valves is from the booster air pipe to the discharge pipeline, and the first air pipe and the booster air pipe are connected with gas supply device;The storage component includes one or more storage tanks, the feed inlet of the storage tank is connected with the discharge pipeline, the discharge port of the storage tank is connected with the import of third conveying device, the top of the storage tank is equipped with dust fall exhaust port, the inside bottom of the storage tank is equipped with air jet, the air jet is connected with gas supply device by compressed air supply pipeline, and the connection place of the air jet and the compressed air supply pipeline is equipped with pulse switch.

[0006] In the utility model powder air conveying system one example, the magnetic separation device includes shell, the top of the shell is equipped with first feed inlet, the bottom of the shell is equipped with first discharge port, one side of the shell is equipped with impurity outlet, the shell is rotatably installed with magnetic separation roller, the outer wall of the both ends of the magnetic separation roller is equipped with annular baffle, the outer wall of the magnetic separation roller between two annular baffles is evenly distributed with a plurality of blades along the axial direction of the magnetic separation roller, the both ends of a plurality of the blades are fixedly connected with two annular baffles respectively, arc-shaped magnet is arranged in the magnetic separation roller along the axial direction of the magnetic separation roller, one end of the magnet is fixedly connected with the shell, one side of the magnet cooperates with the first feed inlet, the other side of the magnet cooperates with the impurity outlet, the outside of the shell is equipped with first drive motor, and the first drive motor is drivingly connected with the magnetic separation roller, for driving the magnetic separation roller to rotate.

[0007] In the utility model powder air conveying system one example, the first feed inlet is located directly above the magnetic separation roller, the first feed inlet cooperates with the magnetic separation roller, the first feed inlet is connected with the discharge port of the negative pressure unloading device, one end of the impurity outlet towards the magnetic separation roller cooperates with the blade, and the first discharge port is connected with the feed inlet of the buffer tank.

[0008] In one example of the powder conveying system of this utility model, the first conveying device is a screw conveyor, and the number of inlets on the first conveying device matches the number of screw dust collectors.

[0009] In one example of the powder conveying system of this utility model, the second conveying device is a screw conveyor, the number of inlets on the second conveying device matches the number of buffer tanks, and a first valve is provided at the outlet of each buffer tank, the first valve being connected to the inlet of the second conveying device.

[0010] In one example of the powder conveying system of this utility model, the top of the temporary storage tank is provided with a second feed inlet, which is connected to the outlet of the second conveying device through a second valve, and the top of the temporary storage tank is provided with an air pressure monitoring device.

[0011] In one example of the powder conveying system of this utility model, a third valve is provided on the first air pipe, a first air inlet is provided on the top of the temporary storage tank, a fourth valve is provided at the first air inlet, and the fourth valve is connected to the first air pipe through a pipe.

[0012] In one example of the powder conveying system of this utility model, a fifth valve is provided at one end of the discharge pipe connected to the temporary storage tank, and several sixth valves are provided on the discharge pipe to cooperate with the storage tank.

[0013] In one example of the powder conveying system of this utility model, a seventh valve is provided on the assist air pipe, and the airflow direction in the plurality of one-way valves is the same as the material flow direction in the discharge pipe.

[0014] In one example of the powder conveying system of this utility model, an eighth valve is provided at the outlet of each of the storage tanks, the third conveying device is a screw conveyor, the number of inlets on the third conveying device matches the number of storage tanks, and the eighth valve is connected to the inlet of the third conveying device.

[0015] In one example of the powder conveying system of this utility model, one end of the compressed air supply pipe is connected to the auxiliary air pipe between the air supply device and the seventh valve, and a ninth valve is provided at the connection between the compressed air supply pipe and the auxiliary air pipe.

[0016] This utility model's rubber powder pneumatic conveying system utilizes the cooperation of a fan and a spiral dust collector to draw rubber powder into the spiral dust collector. After settling, the rubber powder enters a magnetic separator through a negative pressure unloading device. The magnetic separator separates the rubber powder from iron powder. The separated iron powder impurities enter a first conveying device through an impurity outlet, are discharged and collected by the first conveying device, and then enter a buffer tank through a second conveying device into a temporary storage tank. Then, a compressed air supply device provides compressed air to a first air pipe. The high-pressure airflow in the first air pipe carries the rubber powder at the outlet of the temporary storage tank into the discharge pipe. The rubber powder enters a storage tank under the influence of the high-pressure airflow, and the rubber powder in the storage tank is conveyed to the next production process by a third conveying device.

[0017] When the flow of rubber powder in the discharge pipe is obstructed or blocked, compressed air is supplied to the booster air pipe using an air supply device. The high-pressure airflow in the booster air pipe passes through several one-way valves into the discharge pipe, which disperses the rubber powder and clears the pipe, allowing the rubber powder to be pushed forward more quickly by the airflow, thus improving the conveying efficiency. Compressed air is also supplied to the compressed air supply pipe using the air supply device. The high-pressure airflow in the compressed air supply pipe is ejected at the jet nozzle via a pulse switch. This high-pressure airflow disperses the rubber powder in the storage tank, effectively preventing it from clumping.

[0018] This invention utilizes a cleaning component to remove iron powder impurities from the rubber powder, and a pneumatic conveying component to transport the rubber powder to a storage component. The pneumatic conveying method cools the rubber powder, avoiding the fire hazards associated with traditional ton-bag storage. The vertical storage tank effectively reduces space requirements. Changing the direction of the discharge pipe alters the material's conveying direction. Using pneumatic conveying instead of traditional screw conveyors and conveyor belts reduces space requirements, facilitates maintenance, and lowers maintenance costs. This invention can be integrated into an automated electrical control system. Multiple temperature, pressure, and level sensors collect relevant data, which is automatically identified by a PLC program. Once started, no human intervention is required, enabling intelligent and convenient operation.

[0019] This invention utilizes compressed air as a power source to propel rubber powder to a designated destination, achieving rubber powder cooling, safety, environmental protection, and high efficiency. It truly reduces costs and increases efficiency, preventing blockages and agglomeration of the rubber powder, thus benefiting subsequent production processes. This invention can also transport other powdery materials, not just rubber powder. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the adhesive powder pneumatic conveying system of this utility model;

[0021] Figure 2 This is a schematic diagram of the magnetic separator in one embodiment of the powder conveying system of this utility model;

[0022] Figure 3 This is a side view of the magnetic separator in one embodiment of the powder conveying system of this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the pneumatic conveying component in one embodiment of the adhesive powder pneumatic conveying system of this utility model;

[0024] Figure 5 This is a schematic diagram of the material storage component in one embodiment of the powder conveying system of this utility model.

[0025] Component designation:

[0026] 100. Impurity removal assembly; 110. Spiral dust collector; 120. Fan; 130. Negative pressure unloading device; 140. Magnetic separator; 141. Shell; 142. First feed inlet; 143. Impurity outlet; 144. Magnetic separator roller; 145. Annular baffle; 146. Blade; 147. Magnet; 148. First drive motor; 150. First conveying device; 160. Buffer tank; 161. First valve; 170. Second conveying device; 200. Pneumatic conveying assembly; 210. Temporary storage tank; 211. Second feed inlet; 212. Second valve; 213. 214. Air pressure monitoring device; 215. First air inlet; 220. Fourth valve; 221. First air pipe; 222. Third valve; 230. Discharge pipe; 231. Fifth valve; 232. Sixth valve; 240. Assisted air pipe; 241. One-way valve; 242. Seventh valve; 250. Air supply device; 300. Material storage assembly; 310. Material storage tank; 311. Air jet nozzle; 312. Pulse switch; 313. Eighth valve; 314. Dust suppression exhaust port; 320. Third conveying device; 330. Compressed air supply pipe; 331. Ninth valve. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. It should also be understood that the terminology used in the embodiments of this utility model is for describing specific implementation schemes and not for limiting the scope of protection of this utility model. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0028] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in this invention, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this invention, as well as the prior art known to those skilled in the art and the description of this invention, may be implemented using any prior art methods, equipment, and materials similar to or equivalent to those in the embodiments of this invention.

[0029] Please see Figures 1 to 5This utility model provides a powder conveying system, which includes: a dust removal component 100, a conveying component 200, and a storage component 300. The dust removal component 100 includes one or more spiral dust collectors 110. The top of each spiral dust collector 110 is connected to the inlet of a fan 120 through a pipe. Each spiral dust collector 110 has a negative pressure unloading device 130 at its outlet. Each negative pressure unloading device 130 has a magnetic separator 140 at its outlet. The impurity outlet 143 of each magnetic separator 140 is connected to the inlet of a first conveying device 150. Each magnetic separator 140 has a buffer tank 160 at its outlet. The outlet of the buffer tank 160 is connected to the inlet of a second conveying device 170. The pneumatic conveying assembly 200 includes a temporary storage tank 210. The inlet of the temporary storage tank 210 is connected to the outlet of the second conveying device 170. One end of the outlet of the temporary storage tank 210 is connected to a first air pipe 220, and the other end of the outlet of the temporary storage tank 210 is connected to a discharge pipe 230. An auxiliary air pipe 240 is provided around the discharge pipe 230 along its extension direction. The auxiliary air pipe 240 is connected to the discharge pipe 230 through several one-way valves 241. The direction of the several one-way valves 241 is from the auxiliary air pipe 240 to the discharge pipe 230. The first air pipe 220 and the auxiliary air pipe 240 are connected to an air supply device 250. The storage assembly 300 includes one or more storage tanks 310. The inlet of the storage tank 310 is connected to the outlet pipe 230, and the outlet of the storage tank 310 is connected to the inlet of the third conveying device 320. The top of the storage tank 310 is provided with a dust suppression exhaust port 314, and the bottom of the inner side of the storage tank 310 is provided with a jet nozzle 311. The jet nozzle 311 is connected to the air supply device 250 through a compressed air supply pipe 330, and a pulse switch 312 is provided at the connection between the jet nozzle 311 and the compressed air supply pipe 330.

[0030] This utility model's adhesive powder pneumatic conveying system utilizes the cooperation of a blower 120 and a spiral dust collector 110 to draw adhesive powder into the spiral dust collector 110. After settling, the adhesive powder enters a magnetic separator 140 through a negative pressure unloading device 130. The magnetic separator 140 separates the adhesive powder from iron powder. The separated iron powder impurities enter a first conveying device 150 through an impurity outlet 143, are discharged and collected by the first conveying device 150, and then enter a buffer tank 160 through a second conveying device 170 into a temporary storage tank 210. Then, a compressed air supply device 250 provides compressed air to a first air pipe 220. The high-pressure airflow in the first air pipe 220 carries the adhesive powder from the outlet of the temporary storage tank 210 into a discharge pipe 230. The adhesive powder, driven by the high-pressure airflow, enters a storage tank 310, and the adhesive powder in the storage tank 310 is then conveyed to the next production process via a third conveying device 320. The gas inside the storage tank 310 will be discharged from the dust suppression exhaust port 314. The dust suppression exhaust port 314 can filter the discharged gas to reduce dust and protect the environment.

[0031] When the flow of rubber powder in the discharge pipe 230 is obstructed or blocked, compressed air is supplied to the assist air pipe 240 by the air supply device 250. The high-pressure airflow in the assist air pipe 240 passes through several one-way valves 241 and enters the discharge pipe 230, dispersing the rubber powder and clearing the discharge pipe 230, which helps improve the conveying efficiency of rubber powder. Compressed air is supplied to the compressed air supply pipe 330 by the air supply device 250. The high-pressure airflow in the compressed air supply pipe 330 is ejected at the jet nozzle 311 through the pulse switch 312. The high-pressure airflow ejected from the jet nozzle 311 disperses the rubber powder in the storage tank 310, which can effectively prevent the rubber powder in the storage tank 310 from clumping.

[0032] It should be noted that the spiral dust collector 110 and the negative pressure unloading device 130 are existing technologies, and their working principles will not be described in detail here. By monitoring the air pressure in the temporary storage tank 210 and the first air pipe 220 as well as at the outlet of the air supply device 250, it can be determined whether there is poor material flow or blockage in the discharge pipe 230.

[0033] Please see Figure 2 and Figure 3In one example of the powder conveying system of this utility model, the magnetic separator 140 includes a housing 141. The top of the housing 141 has a first feed inlet 142, the bottom of the housing 141 has a first discharge outlet, and one side of the housing 141 has an impurity outlet 143. A magnetic separator 144 is rotatably mounted inside the housing 141. Annular baffles 145 are provided on the outer walls at both ends of the magnetic separator 144. A plurality of blades 146 are evenly distributed along the axial direction of the magnetic separator 144 on the outer wall between the two annular baffles 145. Both ends of the blade 146 are fixedly connected to the two annular baffles 145 respectively. An arc-shaped magnet 147 is provided inside the magnetic separator 144 along its axial direction. One end of the magnet 147 is fixedly connected to the outer casing 141. One side of the magnet 147 engages with the first feed inlet 142, and the other side engages with the impurity outlet 143. A first drive motor 148 is provided outside the outer casing 141. The first drive motor 148 is driven by the magnetic separator 144 and is used to drive the magnetic separator 144 to rotate. The first feed inlet 142 is located directly above the magnetic separator 144 and engages with the magnetic separator 144. The first feed inlet 142 is connected to the outlet of the negative pressure unloading device 130. The end of the impurity outlet 143 facing the magnetic separator 144 engages with the blade 146. The first outlet is connected to the feed inlet of the buffer tank 160.

[0034] Impurity-laden rubber powder enters the outer casing 141 through the first feed inlet 142 and falls onto the magnetic separator 144. The first drive motor 148 drives the magnetic separator 144 to rotate counterclockwise. Driven by the annular baffle 145 and the blades 146, the rubber powder follows the rotation of the magnetic separator 144. When passing the magnet 147, the iron powder is attracted. As the magnetic separator 144 rotates, the rubber powder falls into the first discharge port, while the iron powder is attracted onto the magnetic separator 144 and continues to rotate to the impurity outlet 143. After losing the attraction of the magnet 147, the iron powder falls into the impurity outlet 143, thus completing the removal of impurities from the rubber powder.

[0035] Please see Figure 1In one example of the powder conveying system of this utility model, the first conveying device 150 is a screw conveyor, and the number of inlets on the first conveying device 150 matches the number of screw dust collectors 110. The second conveying device 170 is a screw conveyor, and the number of inlets on the second conveying device 170 matches the number of buffer tanks 160. Each buffer tank 160 has a first valve 161 at its outlet, and the first valve 161 is connected to the inlet of the second conveying device 170. The top of the temporary storage tank 210 has a second feed inlet 211, which is connected to the outlet of the second conveying device 170 through a second valve 212. The top of the temporary storage tank 210 has an air pressure monitoring device 213.

[0036] Please see Figure 1 , Figure 4 and Figure 5 In one example of the powder conveying system of this utility model, a third valve 221 is provided on the first air pipe 220, a first air inlet 214 is provided on the top of the temporary storage tank 210, a fourth valve 215 is provided at the first air inlet 214, and the fourth valve 215 is connected to the first air pipe 220 through a pipe. A fifth valve 231 is provided at the end of the discharge pipe 230 connected to the temporary storage tank 210, and several sixth valves 232 that cooperate with the storage tank 310 are provided on the discharge pipe 230. A seventh valve 242 is provided on the assist air pipe 240, and the airflow direction in the several one-way valves 241 is the same as the material flow direction in the discharge pipe 230. An eighth valve 313 is provided at the discharge port of each storage tank 310. The third conveying device 320 is a screw conveyor, and the number of inlets on the third conveying device 320 matches the number of storage tanks 310. The eighth valve 313 is connected to the inlet of the third conveying device 320. One end of the compressed air supply pipe 330 is connected to the auxiliary air pipe 240 between the air supply device 250 and the seventh valve 242. A ninth valve 331 is provided at the connection between the compressed air supply pipe 330 and the auxiliary air pipe 242. Compressed air is supplied to the temporary storage tank 210 through the first air pipe 220 and the first air inlet 214 to increase the pressure inside the temporary storage tank 210, which is beneficial to increasing the conveying speed of the adhesive powder.

[0037] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A powder conveying system, characterized in that, The application relates to a magnetic separation device for separating impurities from a material, which comprises the following components: a dedusting assembly, which comprises one or more spiral dust collectors, the top of each spiral dust collector is connected with the inlet of a fan through a pipeline, a negative pressure discharging device is arranged at the discharge outlet of each spiral dust collector, a magnetic separation device is arranged at the discharge outlet of each negative pressure discharging device, the impurity outlet of each magnetic separation device is connected with the inlet of a first conveying device, a buffer tank is arranged at the discharge outlet of each magnetic separation device, and the discharge outlet of the buffer tank is connected with the inlet of a second conveying device; an air conveying assembly, which comprises a temporary storage tank, the feeding inlet of the temporary storage tank is connected with the outlet of the second conveying device, one end of the discharge outlet of the temporary storage tank is connected with a first air pipe, the other end of the discharge outlet of the temporary storage tank is connected with a discharge pipeline, a booster air pipe is arranged on the periphery of the discharge pipeline along the extension direction of the discharge pipeline, the booster air pipe is connected with the discharge pipeline through a plurality of one-way valves, the directions of the one-way valves are from the booster air pipe to the discharge pipeline, and the first air pipe and the booster air pipe are connected with a gas supply device; a storage assembly, which comprises one or more storage tanks, the feeding inlet of each storage tank is connected with the discharge pipeline, the discharge outlet of each storage tank is connected with the inlet of a third conveying device, a dust removal and exhaust outlet is arranged at the top of each storage tank, a gas injection port is arranged at the inner bottom of each storage tank, the gas injection port is connected with a compressed air supply pipeline, and a pulse switch is arranged at the connection position of the gas injection port and the compressed air supply pipeline.

2. The powder conveying system as described in claim 1, characterized in that, The magnetic separation device comprises a shell, a first feeding inlet is arranged at the top of the shell, a first discharge outlet is arranged at the bottom of the shell, an impurity outlet is arranged on one side of the shell, a magnetic separation roller is rotatably arranged in the shell, annular baffles are arranged on the outer walls of the two ends of the magnetic separation roller, a plurality of blades are uniformly distributed on the outer wall of the magnetic separation roller between the two annular baffles along the axial direction of the magnetic separation roller, the two ends of each blade are fixedly connected with the two annular baffles respectively, a circular-arc-shaped magnet is arranged in the magnetic separation roller along the axial direction of the magnetic separation roller, one end of the magnet is fixedly connected with the shell, one side of the magnet is matched with the first feeding inlet, the other side of the magnet is matched with the impurity outlet, and a first driving motor is arranged outside the shell and is drivingly connected with the magnetic separation roller for driving the magnetic separation roller to rotate.

3. The system of claim 2, wherein the air supply is a fan. The first feeding inlet is located directly above the magnetic separation roller, the first feeding inlet is matched with the magnetic separation roller, the first feeding inlet is connected with the discharge outlet of the negative pressure discharging device, and the end of the impurity outlet, which faces the magnetic separation roller, is matched with the blade. The first discharge outlet is connected with the feeding inlet of the buffer tank.

4. The system of claim 1, wherein the air supply is a fan. The first conveying device is a screw conveyor, the number of inlets on the first conveying device matches the number of the spiral dust collectors, the second conveying device is a screw conveyor, the number of inlets on the second conveying device matches the number of the buffer tanks, a first valve is arranged at the outlet of each buffer tank, and the first valve is connected with the inlet of the second conveying device.

5. The system of claim 1, wherein the air supply is a fan. The top of the temporary storage tank is provided with a second inlet, the second inlet is connected with the outlet of the second conveying device through a second valve, and the top of the temporary storage tank is provided with an air pressure monitoring device.

6. The system of claim 5, wherein the air supply is a fan. A third valve is arranged on the first air pipe, the top of the temporary storage tank is provided with a first air inlet, a fourth valve is arranged at the first air inlet, and the fourth valve is connected with the first air pipe through a pipeline.

7. The system of claim 1, wherein the air supply is a fan. One end of the discharge pipeline connected with the temporary storage tank is provided with a fifth valve, and a plurality of sixth valves matched with the storage tanks are arranged on the discharge pipeline.

8. The system of claim 1, wherein the air supply is a fan. A seventh valve is arranged on the booster air pipe, and the flow directions of the air in the plurality of one-way valves are the same as the material flow direction in the discharge pipeline.

9. The system of claim 1, wherein the air supply is a fan. An eighth valve is arranged at the outlet of each storage tank, the third conveying device is a screw conveyor, the number of inlets on the third conveying device matches the number of the storage tanks, and the eighth valve is connected with the inlet of the third conveying device.

10. The system of claim 8, wherein the air supply is a fan. One end of the compressed air supply pipeline is connected with the booster air pipe between the air supply device and the seventh valve, and a ninth valve is arranged at the connection position of the compressed air supply pipeline and the booster air pipe.

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