Pneumatic powder conveyor and automatic cleaning method thereof

Abstract

The present invention provides a pneumatic powder conveyor and an automatic cleaning method thereof, and relates to the technical field of material transportation. The technical problems existing in the prior art that the material is easily blocked, the cleaning operation is time-consuming and labor-intensive, and the material conveying efficiency is low are solved. The pneumatic powder conveyor includes a storage tank, a cylindrical filter element, a cleaning pipe, a warm air intake pipe, a partition in the tank, a negative pressure suction pipe, a negative pressure suction pipe, a discharge valve, a sealed bin door, a sewage bin, a sewage pipe, a cleaning sealing plate, and a sealing plate dust removal mechanism. The cylindrical filter element is a cylindrical hollow structure provided with a plurality of through holes and is arranged inside the storage tank; the cleaning pipe includes an inlet part and an outlet part, the inlet part extends to the outside of the storage tank, the outlet part extends to the inside of the cylindrical filter element, and the outlet part is provided with a plurality of jet holes; the warm air intake pipe includes an air inlet part and an air outlet part, and the air outlet part extends to the inside of the storage tank. The present invention improves the convenience of machine cleaning, thereby improving the material conveying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of material transportation, and in particular to a pneumatic powder conveyor and an automatic cleaning method thereof. Background Art

[0002] Pneumatic powder conveyor is a machine that uses the airflow generated by negative pressure to transport small-sized materials that are easy to adhere and get wet, or to transport powdered and granular materials that are not heavy. Pneumatic powder conveyor has a broad market prospect in the future.

[0003] The existing pneumatic powder conveyor includes a storage tank, a filter element, a suction pipe, and a suction pipe, wherein the filter element is located in the storage tank and between the suction pipe and the suction pipe. The dust sucked by the suction pipe through the suction pipe will be filtered by the filter element. The filter element can intercept large-size materials or impurities to ensure that the pneumatic powder conveyor only conveys materials that meet the requirements.

[0004] The applicant has found that the prior art has at least the following technical problems:

[0005] Existing pneumatic powder conveyors convey materials that are easy to adhere and harden for a long time, and the materials will accumulate on the filter element and form hardening. The operator needs to manually disassemble the filter element for cleaning. However, due to the relatively complex internal structure of the machine, it needs to be reset after disassembly, so it needs to be disassembled and cleaned by people with certain professional capabilities; or after disassembling the outer shell of the pneumatic powder conveyor, the filter element is cleaned by air blowing with high-pressure airflow, but the air blowing cleaning effect is not good, and long-term air blowing may not achieve the required cleaning effect. If the cleaning is not thorough, subsequent use is prone to blockage, and the above cleaning method is time-consuming and labor-intensive, and the disassembly will be delayed for a long time, resulting in the machine being unable to achieve continuous conveying operations for materials that are easy to adhere and harden, resulting in low material conveying efficiency. Summary of the invention

[0006] The embodiment of the present invention provides a pneumatic powder conveyor and an automatic cleaning method thereof, which solves the technical problems in the prior art that the pneumatic powder conveyor is easy to be blocked, the cleaning operation is time-consuming and labor-intensive, and the material conveying efficiency is low.

[0007] The embodiment of the present invention provides the following technical solutions:

[0008] The embodiment of the present invention provides a pneumatic powder conveyor, comprising a storage tank, a cylindrical filter element, a cleaning pipe, a warm air intake pipe, a tank inner partition, a negative pressure suction pipe, a negative pressure suction pipe, a discharge valve, a sealed bin door, a sewage bin, a sewage pipe, a cleaning sealing plate and a sealing plate dust removal mechanism, wherein:

[0009] The cylindrical filter element is a cylindrical hollow structure provided with a plurality of through holes and is arranged inside the storage tank;

[0010] The cleaning pipe comprises an inlet portion and an outlet portion, wherein the inlet portion extends to the outside of the storage tank, the outlet portion extends to the inside of the cylindrical filter element and the outlet portion is provided with a plurality of spray holes;

[0011] The warm air inlet pipe includes an air inlet portion and an air outlet portion, wherein the air inlet portion extends to the outside of the storage tank, and the air outlet portion extends to the inside of the storage tank;

[0012] The partition plate in the tank separates the material storage tank into a material storage bin and a negative pressure bin which are sequentially distributed from bottom to top; the negative pressure material suction pipe is connected to the material storage bin and an electric switch valve is arranged on the negative pressure material suction pipe; the negative pressure bin is connected to the material storage bin through the cylindrical filter element; and the negative pressure suction pipe is connected to the negative pressure bin;

[0013] The discharge valve and the sealed bin door are both arranged on the storage tank, and when the discharge valve is in an open state, the negative pressure bin is connected to the outside atmosphere, and when the sealed bin door is in an open state, the storage bin is connected to the sewage discharge bin; the sewage discharge pipe is connected to the sewage discharge bin;

[0014] The cleaning sealing plate is arranged at the bottom of the sewage discharge bin and when the cleaning sealing plate is in an open state, the sewage discharge bin is communicated with an external material bin;

[0015] The sealing plate dust removal mechanism is arranged around the cleaning sealing plate and can clean the dust on the cleaning sealing plate by blowing air when the cleaning sealing plate is in an open state.

[0016] Optionally, the sewage discharge bin is also connected to a material discharge ventilation pipe, and a ventilation filter is provided at an air inlet port of the material discharge ventilation pipe.

[0017] Optionally, the number of the cylindrical filter elements is more than two, the outflow portion of the cleaning pipe includes more than two sub-tubes, and each of the cylindrical filter elements is embedded with one sub-tube.

[0018] Optionally, the outlet portion of the warm air inlet pipe extends along the inner wall of the storage bin to a position close to the sealed bin door, and a plurality of air outlets are provided in a section of the outlet portion of the warm air inlet pipe close to the sealed bin door.

[0019] Optionally, the inner diameter of the upper part of the storage bin is larger than the inner diameter of the middle part of the storage bin, and both are larger than the inner diameter of the lower part of the storage bin, the middle part of the storage bin is a conical structure, and the negative pressure suction pipe is connected to the lower part of the storage bin.

[0020] Optionally, the sealed bin door is rotatably connected to the storage tank, and the inner wall of the sealed bin door is provided with an upwardly protruding curved surface, and a pneumatic door opening and closing mechanism is provided between the sealed bin door and the storage tank, and the pneumatic door opening and closing mechanism can drive the sealed bin door to open or close the storage bin under the action of air pressure.

[0021] Optionally, a protrusion is provided in the middle of the cleaning sealing plate, and a bin bottom opening adapted to the protrusion of the cleaning sealing plate is provided at the bottom of the sewage discharge bin, and an electromagnet for sealing the bin bottom opening is provided at the edge of each of the bin bottom opening and the cleaning sealing plate, and a sealing rubber pad is provided between the electromagnet on the cleaning sealing plate and the protrusion, and the sealing plate dust removal mechanism includes an air blowing pipe, an air blowing valve and an air blowing ring, the air blowing valve is provided on the air blowing pipe, and the air blowing ring is connected with the air blowing pipe when the air blowing valve is opened, the air blowing ring is arranged around the cleaning sealing plate, and the air blowing ring is provided with a plurality of air blowing ports facing the edge of the bin bottom opening.

[0022] Optionally, the pneumatic powder conveyor is fixed on a fixed cover on the top of the silo, and a sealing plate switching mechanism is also provided between the cleaning sealing plate and the fixed cover on the top of the silo, the sealing plate switching mechanism includes a cylinder, a transmission connecting block and a connecting flange, the cylinder barrel of the cylinder is fixedly connected to the fixed cover on the top of the silo, the cylinder rod of the cylinder is hinged to one end of the transmission connecting block, the other end of the transmission connecting block is hinged to the connecting flange, and the connecting flange is fixedly connected to the cleaning sealing plate.

[0023] Optionally, heating wires for drying are fixedly provided inside the cleaning sealing plate and at the position where the edge of the bin bottom opening abuts against the sealing rubber pad; and / or, an observation window and a driving motor are also provided on the storage tank, and a rotating impeller is provided in the storage bin, and the rotating impeller can rotate driven by the rotating shaft of the driving motor that passes through the tank wall of the storage tank.

[0024] The automatic cleaning method of the pneumatic powder conveyor provided in the embodiment of the present invention comprises the following steps:

[0025] Step A, closing the electric switch valve on the negative pressure suction pipe of the pneumatic powder conveyor provided by any technical solution of the present invention, closing the cleaning sealing plate, opening the sealing chamber door, and injecting gas and water into the cylindrical filter element through the cleaning pipe to wash away the dust material adhering to the cylindrical filter element;

[0026] Step B, when the water level rises to a predetermined height, injecting air into the storage bin through the warm air inlet pipe to perform explosive cleaning, and after the cleaning is completed, the sewage is discharged from the storage tank through the sewage pipe;

[0027] Step C, injecting warm air into the storage bin of the storage tank through the warm air inlet pipe to dry the storage bin;

[0028] Step D, opening the cleaning sealing plate, and cleaning the dust on the cleaning sealing plate by blowing through the sealing plate dust removal mechanism.

[0029] Any of the above technical solutions provided by the embodiments of the present invention produces at least the following technical effects:

[0030] The whole process of cleaning the cylindrical filter element of the present invention does not require disassembling the machine or the cylindrical filter element. It only needs to close the electric switch valve and other valves on the negative pressure suction pipe, close the cleaning sealing plate, open the sealing chamber door, and inject gas and water into the cylindrical filter element through the cleaning pipe to wash away the dust materials adhered to the cylindrical filter element; when the water level rises to a predetermined height, an air flow is injected into the storage bin through the warm air inlet pipe to perform explosion cleaning. After the cleaning is completed, the sewage is discharged from the storage tank through the sewage pipe, and the deep cleaning of the cylindrical filter element is completed. The whole cleaning process omits disassembly of the machine and the cylindrical filter element, and also omits the process of reassembling the cylindrical filter element after the cleaning is completed, so it is more time-saving and labor-saving to clean. Since the process is more economical and the degree of automation is higher, the whole cleaning process takes less time. In addition, the cylindrical filter element is a cylindrical hollow structure provided with a plurality of through holes, which is not easy to be blocked and is easier to clean after cleaning, and the cleaning effect is more ideal, so it solves the technical problems of easy blocking, time-consuming and labor-intensive cleaning operation, and low material conveying efficiency in the prior art.

[0031] In addition, the present invention also solves the problem of insufficient professional personnel for disassembling and cleaning cylindrical filter elements, solves the problem of discharging cleaning wastewater, and solves the problem of drying the inside of the machine and the filter element after water flushing. At the same time, the modular design of the present invention facilitates the rapid assembly and maintenance of the machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Those skilled in the art may better understand the technical effects of the present invention through the following drawings, wherein:

[0033] Figure 1 A schematic diagram of the structure of a pneumatic powder conveyor provided in an embodiment of the present invention.

[0034] Figure 2 A schematic diagram of the structure of another pneumatic powder conveyor provided in an embodiment of the present invention.

[0035] Markings in the figure: 1. Storage tank; 101. Storage bin; 102. Negative pressure bin; 2. Cleaning sealing plate; 3. Sealing rubber pad; 4. Electromagnet; 5. Heating wire; 6. Drain pipe; 7. Drain ball valve; 8. Pneumatic rotary valve; 9. Sealing bin door; 10. Negative pressure suction pipe; 11. Electric switch valve; 12. Unloading ventilation pipe; 13. Ventilation filter; 14. Cylindrical filter element; 15. Cleaning pipe; 16. Cleaning electric ball valve; 17. Discharge valve; 18. Warm air inlet pipe; 19. Warm air inlet pipe electric valve; 20. Sealing plate dust removal mechanism; 21. Dust removal mechanism solenoid valve; 22. Cylinder; 23. Transmission connecting block; 24. Connecting flange; 25. Bin top fixed cover; 26. Drain bin; 27. Observation window; 28. Rotating impeller; 29. ​​Negative pressure suction pipe; 30. Partition inside the tank. DETAILED DESCRIPTION

[0036] The following is combined with the above Figure 1-Figure 2 The preferred implementation modes and various optional implementation schemes provided by the embodiments of the present invention are described in more detail.

[0037] Embodiment 1:

[0038] like Figure 1 As shown, a pneumatic powder conveyor provided by an embodiment of the present invention includes a storage tank 1, a cylindrical filter element 14, a cleaning pipe 15, a warm air intake pipe 18, a tank inner partition 30, a negative pressure suction pipe 10, a negative pressure suction pipe 29, a discharge valve 17, and a sealed compartment door 9 ( Figure 1 and Figure 2 The sealed chamber door 9 in the open and closed states, the sewage chamber 26, the sewage pipe 6, the cleaning sealing plate 2 and the sealing plate dust removal mechanism 20 are shown simultaneously, wherein:

[0039] The cylindrical filter element 14 is a cylindrical hollow structure provided with a plurality of through holes and is arranged inside the storage tank 1 (storage bin 101); the cleaning pipe 15 includes an inlet portion and an outlet portion, the inlet portion extends to the outside of the storage tank 1, the outlet portion extends to the inside of the cylindrical filter element 14 and the outlet portion is provided with a plurality of jet holes; the warm air inlet pipe 18 includes an inlet portion and an outlet portion, the inlet portion extends to the outside of the storage tank 1, and the outlet portion extends to the inside of the storage tank 1; the inner partition 30 of the tank divides the storage tank 1 into a storage bin 101 and a negative pressure bin 102 which are distributed sequentially from bottom to top, the negative pressure suction pipe 10 is connected to the storage bin 101 and an electric switch valve 11 is provided on the negative pressure suction pipe 10, and the negative pressure bin 10 2 is connected to the material storage bin 101 through the cylindrical filter element 14, and the negative pressure suction pipe 29 is connected to the negative pressure bin 102; the discharge valve 17 and the sealing bin door 9 are both arranged on the material storage tank 1, and when the discharge valve 17 is in an open state, the negative pressure bin 102 is connected to the outside atmosphere, when the sealing bin door 9 is in an open state, the material storage bin 101 is connected to the sewage discharge bin 26, and the sewage discharge pipe 6 is connected to the sewage discharge bin 26; the cleaning sealing plate 2 is arranged at the bottom of the sewage discharge bin 26, and when the cleaning sealing plate 2 is in an open state, the sewage discharge bin 26 is connected to the external material bin; the sealing plate dust removal mechanism 20 is arranged around the cleaning sealing plate 2 and can clean the dust on the cleaning sealing plate 2 by blowing when the cleaning sealing plate 2 is in an open state.

[0040] The whole process of cleaning the cylindrical filter element 14 of the present invention does not require disassembling the machine or disassembling the cylindrical filter element 14. It only requires closing the electric switch valve 11 and other valves on the negative pressure suction pipe 10, closing the cleaning sealing plate 2, opening the sealing chamber door 9, and injecting gas and water into the cylindrical filter element 14 through the cleaning pipe 15 to flush the dust material adhered to the cylindrical filter element 14; when the water level rises to a predetermined height, injecting air into the storage bin 101 through the warm air intake pipe 18 for explosive cleaning. After the cleaning is completed, the sewage is discharged from the storage tank 1 through the sewage pipe 6, and the deep cleaning of the cylindrical filter element 14 can be completed. The disassembly of the machine and the cylindrical filter element 14 is omitted in the whole cleaning process, and the process of reassembling the cylindrical filter element 14 after the cleaning is completed is also omitted, so it is more time-saving and labor-saving to clean. Since the process is more economical and the degree of automation is higher, the whole cleaning process takes less time. In addition, the cylindrical filter element is a cylindrical hollow structure provided with a plurality of through holes, which is not easy to be blocked and is easier to clean after cleaning, and the cleaning effect is more ideal.

[0041] As an optional implementation, in this embodiment, the waste discharge bin 26 is also connected to a material discharge ventilation pipe 12, and a ventilation filter 13 is provided at the air inlet port of the material discharge ventilation pipe 12. The material discharge ventilation pipe 12 can ensure that the air pressure of the storage tank 1 is balanced with the external atmospheric pressure, thereby speeding up the feeding and cleaning speed.

[0042] As an optional implementation, in this embodiment, the number of the cylindrical filter core 14 is more than two, and the outflow portion of the cleaning pipe 15 includes more than two sub-tubes, and each cylindrical filter core 14 is embedded with a sub-tube. The cylindrical filter core 14 not only has excellent filtering performance, but is also easy to manufacture and clean. The design of the outflow portion sub-tube of the built-in cleaning pipe 15 in the cylindrical filter core 14 can achieve deep cleaning of each cylindrical filter core 14, thereby increasing the cleaning speed and improving the cleaning effect.

[0043] As an optional implementation, in this embodiment, the outlet portion of the warm air inlet pipe 18 extends along the inner wall of the storage bin 101 to a position close to the sealed bin door 9, and a plurality of air outlets are provided in the section of the outlet portion of the warm air inlet pipe 18 close to the sealed bin door 9.

[0044] This design, on the one hand, will not interfere with the transportation of materials by the warm air inlet pipe 18, and on the other hand, is conducive to the rapid and uniform release of warm air to the sealed bin door 9 to better achieve explosion cleaning and drying operations.

[0045] As an optional implementation, in this embodiment, the inner diameter of the upper part of the storage bin 101 is larger than the inner diameter of the middle part of the storage bin 101, and both are larger than the inner diameter of the lower part of the storage bin 101. The middle part of the storage bin 101 is a conical structure, and the negative pressure suction pipe 10 is connected to the lower part of the storage bin 101. This design is conducive to the rapid fall of the sucked material and the sewage generated after cleaning, thereby improving the efficiency of material transmission and internal cleaning of the entire device.

[0046] As an optional implementation, in this embodiment, the sealed bin door 9 is rotatably connected to the storage tank 1, and the inner wall of the sealed bin door 9 is provided with an upwardly protruding arc surface, and a pneumatic door opening and closing mechanism is provided between the sealed bin door 9 and the storage tank 1. The pneumatic door opening and closing mechanism can drive the sealed bin door 9 to open or close the storage bin 101 under the action of air pressure.

[0047] This design of the sealed door 9 allows less sewage to be stored, making it easier to dry, thereby improving cleaning efficiency.

[0048] As an optional implementation, in this embodiment, a protrusion is provided in the middle of the cleaning sealing plate 2, and a bin bottom opening adapted to the protrusion of the cleaning sealing plate 2 is provided at the bottom of the sewage discharge bin 26. An electromagnet 4 for sealing the bin bottom opening is provided at the edge of each of the bin bottom opening and the cleaning sealing plate 2. A sealing rubber pad 3 is provided between the electromagnet 4 on the cleaning sealing plate 2 and the protrusion. The sealing plate dust removal mechanism 20 includes an air blowing pipe, an air blowing valve and an air blowing ring. The air blowing valve is provided on the air blowing pipe. When the air blowing valve is opened, the air blowing ring is connected to the air blowing pipe. The air blowing ring is arranged around the cleaning sealing plate 2, and the air blowing ring is provided with a plurality of air blowing ports facing the edge of the bin bottom opening.

[0049] The arrangement of the electromagnet 4 and the sealing rubber pad 3 can improve the sealing performance of the cleaning sealing plate 2. The sealing plate dust removal mechanism 20 can utilize the airflow to clean the cleaning sealing plate 2 and the edge of the bottom opening, thereby further improving the sealing effect.

[0050] As an optional implementation, in this embodiment, the pneumatic powder conveyor is fixed on the fixed cover 25 on the top of the silo, and a sealing plate switching mechanism is also arranged between the cleaning sealing plate 2 and the fixed cover 25 on the top of the silo. The sealing plate switching mechanism includes a cylinder 22, a transmission connecting block 23 and a connecting flange 24. The cylinder barrel of the cylinder 22 is fixedly connected to the fixed cover 25 on the top of the silo, the cylinder rod of the cylinder 22 is hinged to one end of the transmission connecting block 23, and the other end of the transmission connecting block 23 is hinged to the connecting flange 24, and the connecting flange 24 is fixedly connected to the cleaning sealing plate 2.

[0051] The cylinder rod of the cylinder 22 moves left and right along the horizontal direction to control the cleaning sealing plate 2 to open or close the bottom opening of the sewage discharge bin 26. This design has the advantages of compact structure, convenient connection operation and maintenance. The cylinder 22 is preferably a pen-shaped cylinder 22.

[0052] As an optional implementation, in this embodiment, a heating wire 5 for drying is fixedly arranged inside the cleaning sealing plate 2 and at the position where the edge of the bin bottom opening abuts against the sealing rubber pad 3. The setting of the heating wire 5 can increase the drying speed, thereby improving the cleaning efficiency and reducing the time consumed by the machine cleaning operation.

[0053] As can be seen from the above, the advantages of the preferred solution of this embodiment include:

[0054] 1. The present invention can realize fully automatic cleaning and automatic loading, and the machine material conveying operation has a longer running time and higher conveying efficiency.

[0055] 2. The present invention utilizes the mutual attraction of the electromagnets 4 to assist in achieving sealing, thereby improving the sealing effect.

[0056] 3. The special structure of the multi-layer annular sealing rubber gasket 3 of the present invention realizes watertight sealing and has a good sealing effect.

[0057] 4. The special structure drainage of the inclined boss formed by the protruding part of the cleaning sealing plate 2 of the present invention improves the drainage efficiency.

[0058] The present invention uses the heat pressure difference generated by the heating wire 5 to evaporate the residual water at the sealing part of the cleaning sealing plate 2, thereby improving the drying speed.

[0059] 6. The present invention can utilize high-pressure water sweeping and air-water cleaning, and has high cleaning efficiency.

[0060] 7. The material storage bin 101 of the present invention utilizes a drying method with no dead angles, and the drying effect is better.

[0061] Embodiment 2:

[0062] like Figure 2 As shown, the embodiment of the present invention is basically the same as the embodiment 1 except that: in the embodiment, an observation window 27 and a driving motor are further provided on the storage tank 1, and a rotating impeller 28 is provided in the storage bin 101, and the rotating impeller 28 can rotate under the drive of the rotating shaft of the driving motor penetrating the tank wall of the storage tank 1. A plurality of rotating impellers 28 can be provided, and can be distributed in the storage bin 101 and the sewage bin 26 at the same time.

[0063] The rotating impeller 28 can increase the flow rate of the cleaning water (hereinafter referred to as cleaning water) in the storage bin 101 when it reaches a certain height, thereby improving the cleaning efficiency and the cleaning effect, thereby reducing the material transportation time delayed by cleaning, thereby improving the overall transportation efficiency of the device.

[0064] The embodiments of the present invention provide Figure 1 or Figure 2 The automatic cleaning method of the pneumatic powder conveyor shown comprises the following steps:

[0065] Step A, closing the electric switch valve 11 on the negative pressure suction pipe 10 of the pneumatic powder conveyor provided by any technical solution of the present invention, closing the cleaning sealing plate 2, opening the sealing chamber door 9, and injecting gas and water into the cylindrical filter element 14 through the cleaning pipe 15 to wash away the dust material adhering to the cylindrical filter element 14;

[0066] Step B, when the water level rises to a predetermined height, air is injected into the storage bin 101 through the warm air inlet pipe 18 to perform explosive cleaning, and after the cleaning is completed, the sewage is discharged from the storage tank 1 through the sewage pipe 6;

[0067] Step C, injecting warm air into the storage bin 101 of the storage tank 1 through the warm air inlet pipe 18 to dry the storage bin 101;

[0068] Step D: open the cleaning sealing plate 2 and clean the dust on the cleaning sealing plate 2 by blowing air through the sealing plate dust removal mechanism 20.

[0069] The material conveying (loading) process of the pneumatic powder conveyor provided in the preferred embodiment of the present invention is as follows:

[0070] Before loading Figure 1 or Figure 2The equipment shown is reset: the bottom cleaning sealing plate 2 is retracted to the right, the unloading channel is opened, and the sealed bin door 9 is closed under the drive of the pneumatic rotary valve 8, the electric switch valve 11 of the negative pressure suction pipe 10 is opened, and the electric valve 19 of the warm air intake pipe and the cleaning electric ball valve 16 at the top are all closed. The discharge valve 17 is also closed, so that the storage bin 101 is in a closed state. After the storage bin is sealed as a whole, the negative pressure suction pipe 29 is ventilated by the fan to form a negative pressure. The material enters the storage bin 101 through the negative pressure suction pipe 10 under the action of negative pressure, and the suction stops after the material is sucked for a certain period of time. When discharging, the discharge valve 17 is opened to destroy the negative pressure in the storage bin 101, and then the sealed bin door 9 is opened by the pneumatic rotary valve 8, and the material sucked in the storage bin 101 falls vertically into the material storage bin of the machine below. This step is circulated in sequence, which is the material conveying (loading) process of the present invention.

[0071] The cleaning process of the pneumatic powder conveyor provided in the preferred embodiment of the present invention is as follows:

[0072] After the pneumatic powder conveyor reaches a certain number of feeding times, the cleaning step is triggered: the cleaning sealing plate 2 is pushed to the left to the end point by the cylinder 22. After it is in place, the cleaning sealing plate 2 is sucked by the electromagnet 4. Under the action of the sealing pad 3, the cleaning sealing plate 2 and the storage tank 1 are sealed to prevent the leakage of cleaning water above. At the same time, the sealing bin door 9 is opened, the electric switch valve 11 of the negative pressure suction pipe 10 is closed, the warm air intake pipe electric valve 19 is closed, the sewage ball valve 7 is closed before cleaning, and the cleaning electric ball valve 16 is opened. The cleaning water is sprayed into the cylindrical filter element 14 at high pressure through the cleaning pipe 15. Under the action of pressure, the cleaning water seeps out through the cylindrical filter element 14. When the cleaning water in the storage bin 101 reaches a certain height, the warm air intake pipe electric valve 19 is opened to intake air, and at the same time, it plays the role of explosion cleaning. After a period of cleaning explosion, the cleaning electric ball valve 16 is closed, the sewage ball valve 7 is opened, and the cleaning sewage is discharged. The warm air intake pipe 18 remains in working condition, and water removal and drying work are performed in the entire silo. After the drying is completed, the loading process can begin.

[0073] The air blowing ring of the sealing plate dust removal mechanism 20 is arranged in a ring shape on the side of the cleaning sealing plate 2, with the air blowing port facing inward and obliquely upward. Each time the cleaning sealing plate 2 is opened and closed, the dust removal mechanism electromagnetic valve 21 is started to blow air to clean the sealing surface.

[0074] The above technical solutions are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pneumatic powder conveyor, characterized in that: It includes a storage tank, a cylindrical filter element, a cleaning pipe, a warm air intake pipe, a tank inner partition, a negative pressure suction pipe, a negative pressure suction pipe, a discharge valve, a sealed bin door, a sewage bin, a sewage pipe, a cleaning sealing plate and a sealing plate dust removal mechanism, wherein: The cylindrical filter element is a cylindrical hollow structure provided with a plurality of through holes and is arranged inside the storage tank; The cleaning pipe comprises an inlet portion and an outlet portion, wherein the inlet portion extends to the outside of the storage tank, the outlet portion extends to the inside of the cylindrical filter element and the outlet portion is provided with a plurality of spray holes; The warm air inlet pipe includes an air inlet portion and an air outlet portion, wherein the air inlet portion extends to the outside of the storage tank, and the air outlet portion extends to the inside of the storage tank; The partition plate in the tank separates the material storage tank into a material storage bin and a negative pressure bin which are sequentially distributed from bottom to top; the negative pressure material suction pipe is connected to the material storage bin and an electric switch valve is arranged on the negative pressure material suction pipe; the negative pressure bin is connected to the material storage bin through the cylindrical filter element; and the negative pressure suction pipe is connected to the negative pressure bin; The discharge valve and the sealed bin door are both arranged on the storage tank, and when the discharge valve is in an open state, the negative pressure bin is connected to the outside atmosphere, and when the sealed bin door is in an open state, the storage bin is connected to the sewage discharge bin; the sewage discharge pipe is connected to the sewage discharge bin; The cleaning sealing plate is arranged at the bottom of the sewage discharge bin and when the cleaning sealing plate is in an open state, the sewage discharge bin is communicated with an external material bin; The sealing plate dust removal mechanism is arranged around the cleaning sealing plate and can clean the dust on the cleaning sealing plate by blowing air when the cleaning sealing plate is in an open state.

2. The pneumatic powder conveyor according to claim 1, characterized in that: The sewage discharge bin is also connected to a material discharge ventilation pipe, and a ventilation filter is provided at the air inlet port of the material discharge ventilation pipe.

3. The pneumatic powder conveyor according to claim 1, characterized in that: The number of the cylindrical filter elements is more than two, the outflow portion of the cleaning pipe includes more than two sub-tubes, and each of the cylindrical filter elements is embedded with one sub-tube.

4. The pneumatic powder conveyor according to claim 3, characterized in that: The outlet portion of the warm air inlet pipe extends along the inner wall of the storage bin to a position close to the sealed bin door, and a plurality of air outlets are provided in the section of the outlet portion of the warm air inlet pipe close to the sealed bin door.

5. The pneumatic powder conveyor according to claim 4, characterized in that: The inner diameter of the upper part of the storage bin is larger than the inner diameter of the middle part of the storage bin, and both are larger than the inner diameter of the lower part of the storage bin. The middle part of the storage bin is a conical structure, and the negative pressure suction pipe is connected to the lower part of the storage bin.

6. The pneumatic powder conveyor according to claim 5, characterized in that: The sealed bin door is rotatably connected to the storage tank, and the inner wall of the sealed bin door is provided with an upwardly protruding arc surface, and a pneumatic door opening and closing mechanism is provided between the sealed bin door and the storage tank, and the pneumatic door opening and closing mechanism can drive the sealed bin door to open or close the storage bin under the action of air pressure.

7. The pneumatic powder conveyor according to claim 5, characterized in that: A protrusion is provided in the middle of the cleaning sealing plate, and a bin bottom opening adapted to the protrusion of the cleaning sealing plate is provided at the bottom of the sewage discharge bin, and an electromagnet for sealing the bin bottom opening is provided at the edge of each of the bin bottom opening and the cleaning sealing plate, and a sealing rubber pad is provided between the electromagnet on the cleaning sealing plate and the protrusion, and the sealing plate dust removal mechanism includes an air blowing pipe, an air blowing valve and an air blowing ring, the air blowing valve is provided on the air blowing pipe, and the air blowing ring is connected with the air blowing pipe when the air blowing valve is opened, the air blowing ring is arranged around the cleaning sealing plate, and the air blowing ring is provided with a plurality of air blowing ports facing the edge of the bin bottom opening.

8. The pneumatic powder conveyor according to claim 7, characterized in that: The pneumatic powder conveyor is fixed on the fixed cover on the top of the silo, and a sealing plate switching mechanism is also arranged between the cleaning sealing plate and the fixed cover on the top of the silo. The sealing plate switching mechanism includes a cylinder, a transmission connecting block and a connecting flange. The cylinder barrel of the cylinder is fixedly connected to the fixed cover on the top of the silo, the cylinder rod of the cylinder is hinged to one end of the transmission connecting block, the other end of the transmission connecting block is hinged to the connecting flange, and the connecting flange is fixedly connected to the cleaning sealing plate.

9. The pneumatic powder conveyor according to claim 8, characterized in that: Heating wires for drying are fixedly arranged inside the cleaning sealing plate and at the position where the edge of the bin bottom opening abuts against the sealing rubber pad; and / or, an observation window and a driving motor are also provided on the storage tank, and a rotating impeller is provided in the storage bin, and the rotating impeller can rotate driven by the rotating shaft of the driving motor that passes through the tank wall of the storage tank.

10. An automatic cleaning method for a pneumatic powder conveyor according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step A, closing the electric switch valve on the negative pressure suction pipe of the pneumatic powder conveyor according to any one of claims 1 to 9, closing the cleaning sealing plate, opening the sealing chamber door, and injecting gas and water into the cylindrical filter element through the cleaning pipe to wash away the dust material adhering to the cylindrical filter element; Step B, when the water level rises to a predetermined height, injecting air into the storage bin through the warm air inlet pipe to perform explosive cleaning, and after the cleaning is completed, the sewage is discharged from the storage tank through the sewage pipe; Step C, injecting warm air into the storage bin of the storage tank through the warm air inlet pipe to dry the storage bin; Step D, opening the cleaning sealing plate, and cleaning the dust on the cleaning sealing plate by blowing through the sealing plate dust removal mechanism.

Images