Anti-blocking device for pneumatic conveying of powdery materials

Abstract

The invention relates to the technical field of anti-blocking devices, in particular to a powdery material pneumatic conveying anti-blocking device which is characterized in that when a rotating shaft end drives a sealing plug to move between a first sealing block and a second sealing block, an anti-blocking part is closed, and concentrated-phase airflow cannot pass through; the rotating shaft end continues to drive the sealing plug to move upwards away from the first sealing block, a gap is formed between the sealing plug and the first sealing block, along with upward movement of the sealing plug, the gap is larger and larger, the speed of the dense-phase airflow blowing to the sealing door is smaller, and on the contrary, the smaller the gap is, the speed of the dense-phase airflow blowing to the sealing door is higher; the speed of the dense-phase airflow blown to the sealing door is adjusted according to the blocking condition of the easily-blocked part, the main pipeline is dredged, the easily-blocked part of the main pipeline is separately dredged, the consumption of compressed air is reduced, the easily-blocked part can be dredged by adjusting the anti-blocking part without increasing the pressure of the compressed air, and the dredging efficiency is improved. The energy consumption and the operation cost are reduced, and meanwhile, the equipment investment is also reduced.

Description

Technical Field

[0001] The invention relates to the technical field of anti-blocking devices, in particular to an anti-blocking device for pneumatic conveying of powdered materials. Background Art

[0002] Pneumatic conveying of powders is a method of conveying powders in a closed pipeline using air as a power source. It is very suitable for conveying granular materials. The conveying of powders in pipelines can effectively reduce environmental pollution caused by material falling during the conveying process, reduce the damage of harmful substances to the human body, and also improve efficiency and reduce the workload of staff. Compared with other methods, pneumatic conveying is safer, has high conveying efficiency, and can have variable conveying paths. It has more advantages than spiral conveying, bucket lifting, belt conveying, vibration conveying and other conveying methods. Therefore, pneumatic conveying has become the preferred solution for powdered materials and is an important part of many production enterprises to achieve green and environmentally friendly production. In thermal power plants, coal-fired boilers and other enterprises, fly ash collected by dust removal processes needs to be conveyed and collected. Generally, compressed air dense phase airflow is used for conveying. The conveyed materials are very easy to adhere to the inner wall of the conveying pipeline and valve instrument due to various non-external reasons, causing blockage and affecting the stability and reliability of the process operation. The existing dense phase airflow compressed air conveying of powdered materials is because the properties of the materials change with the process. However, the fluctuations of external factors (compressed air quality, external temperature and humidity, etc.) change at any time, causing the powdered materials to adhere to the inner walls of the conveying pipeline and valve instruments, which can easily cause blockage. The existing anti-blocking measures mainly include: 1. Insulating the conveying pipeline to prevent temperature factors such as low-temperature condensation to reduce material adhesion; 2. Increasing the flow and pressure of compressed air, and using a higher dense phase gas flow and pressure to purge the conveying pipeline (or intermittent delivery for pre-purging, or back-blowing the pipeline, etc.). Although this method can alleviate pipeline blockage to a certain extent, it consumes a lot of compressed air, that is, high energy consumption, high operating costs and large equipment investment. Summary of the invention

[0003] The main purpose of the present invention is to provide a device for preventing clogging of pneumatic conveying of powdered materials, so as to solve the problems of high energy consumption, high operating cost and large equipment investment proposed in the related art.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, a device for preventing pneumatic conveying of powdered materials from being blocked is provided, comprising: a main pipe, the main pipe being used to convey powdered materials, the main pipe being provided with instruments, valves, etc., forming a blockage-prone portion when conveying powdered materials, a pressure sensor being provided downstream of the blockage-prone portion, the pressure sensor being fixedly arranged on the outer wall of the main pipe, and being used to monitor the pressure in the main pipe downstream of the blockage-prone portion, and if the pressure drops, the blockage-prone portion is blocked;

[0005] A branch pipeline is arranged downstream of the easily blocked part, and is fixedly connected to the main pipeline at a certain angle. A closed door is arranged inside the junction of the branch pipeline and the main pipeline. When the closed door is closed, the powdery material in the main pipeline cannot enter the branch pipeline. When the closed door is opened, the dense phase airflow in the branch pipeline can enter the main pipeline to clear the easily blocked part;

[0006] The anti-blocking part comprises a No. 1 sealing block, a No. 2 sealing block and a sealing part. When the sealing part is located between the No. 1 sealing block and the No. 2 sealing block, the anti-blocking part is closed, and the dense-phase airflow cannot flow through the anti-blocking part. After the sealing part moves up and leaves the No. 1 sealing block, a gap is formed between the sealing part and the No. 1 sealing block, and the dense-phase airflow can clear the easily blocked parts through the gap. The farther the sealing part is from the No. 1 sealing block, the larger the gap formed and the smaller the dense-phase airflow speed. The closer the sealing part is to the No. 1 sealing block, the smaller the gap formed and the larger the dense-phase airflow speed.

[0007] Furthermore, the closed door includes a door body, a pit, a pin, a torsion spring and a fixing ring. The pin is fixed on the front side of the door body, and the torsion spring is sleeved on the outer ring of the pin.

[0008] Furthermore, a plurality of fixing rings are provided at both legs of the torsion spring, half of which are fixedly connected to the door body to restrict one leg of the torsion spring to the surface of the door body, and half of which are fixedly connected to the inner wall of the branch pipe to restrict one leg of the torsion spring to the inner wall of the branch pipe, and the leg of the torsion spring can slide in the fixing ring.

[0009] Furthermore, there are a plurality of pits distributed on the surface of the door body and located on the same side of the door body as the pins. When the dense phase airflow blows toward the pits, it is rebounded, changing the direction of the airflow and blowing toward the easily blocked parts.

[0010] Furthermore, the door body is provided with a pin on one side which is rotatably connected to the side wall of the branch pipeline. When the main pipeline conveys powdered materials, the door body is perpendicular to the branch pipeline under the action of the torsion spring, and the branch pipeline is separated from the main pipeline. When dense phase airflow passes through the branch pipeline, the dense phase airflow overcomes the pulling force of the torsion spring, pushes the door body to rotate, and the branch pipeline is connected to the main pipeline.

[0011] Furthermore, the No. 1 sealing block and the No. 2 sealing block are both fixedly connected to the inner wall of the branch pipe and are perpendicular to the inner wall of the branch pipe. The No. 1 sealing block and the No. 2 sealing block are located on both sides of the sealing part. The No. 1 sealing block is located at an end away from the sealing part, and the No. 2 sealing block is located at an end close to the sealing part.

[0012] Furthermore, the sealing part includes a rotating shaft, a shaft end, a shell, a shell cover, a supporting sheet and a sealing plug. The shell is fixedly connected to the branch pipeline, and the sealing part is installed on the branch pipeline.

[0013] Furthermore, the rotating shaft is arranged inside the shell and is threadedly connected to the shell. When the rotating shaft rotates, it can move up and down along the shell. An end of the rotating shaft exposed from the shell is fixed with a shaft end, and the rotating shaft can be rotated by holding the shaft end.

[0014] Furthermore, a shell cover is fixedly provided on the top of the shell to separate the sealing part from the outside, and the shell cover is rotatably connected to the rotating shaft.

[0015] Furthermore, a support sheet is fixedly provided at the other end of the rotating shaft, a sealing plug is fixedly provided on the outer surface of the support sheet, the support sheet fixes the sealing plug at the end of the rotating shaft, and the rotating shaft can drive the sealing plug to move.

[0016] Compared with the prior art, the present invention has the following beneficial effects: the speed of the dense-phase airflow blowing toward the closed door in the branch pipeline can be adjusted by rotating the shaft end; when the rotating shaft end drives the sealing plug to move between the No. 1 sealing block and the No. 2 sealing block, the anti-blocking part is closed and the dense-phase airflow cannot pass through; the shaft end is continued to be rotated to drive the sealing plug to move upward away from the No. 1 sealing block, and a gap appears between the sealing plug and the No. 1 sealing block. As the sealing plug moves upward, the gap becomes larger and larger. When the sealing plug moves to the bottom of the shell, the gap is the largest. The larger the gap, the smaller the speed of the dense-phase airflow blowing toward the closed door. Conversely, the smaller the gap, the larger the speed of the dense-phase airflow blowing toward the closed door. The speed of the dense-phase airflow blowing toward the closed door is adjusted according to the blockage situation of the easily blocked part, the main pipeline is dredged, and the easily blocked parts of the main pipeline are separately dredged, thereby reducing the consumption of compressed air. By adjusting the anti-blocking part, the easily blocked parts can be dredged without increasing the pressure of the compressed air, thereby reducing energy consumption and operating costs, and also reducing the investment in equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the anti-blocking part of the present invention being closed;

[0019] Figure 3 This is a schematic diagram of the anti-blocking opening of the present invention;

[0020] Figure 4 This is a schematic diagram of the anti-blocking part structure of the present invention;

[0021] Figure 5 It is a schematic diagram of the closed door structure of the present invention.

[0022] Illustration Description:

[0023] 1. Main road;

[0024] 2. Branch pipeline;

[0025] 3. Anti-blocking part; 31. Rotating shaft; 32. Shaft end; 33. Housing; 34. Housing cover; 35. Support sheet; 36. Sealing plug; 37. No. 1 sealing block; 38. No. 2 sealing block;

[0026] 4. Closed door; 41. Door body; 42. Pit; 43. Pin; 44. Torsion spring; 45. Fixing ring;

[0027] 5. Parts prone to clogging;

[0028] 6. Pressure sensor. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0030] See also Figures 1 to 5 The present embodiment provides a device for preventing pneumatic conveying of powdered materials from being blocked, comprising: a main pipeline 1, the main pipeline 1 is used for conveying powdered materials, the main pipeline 1 is provided with instruments, valves, etc., a blockage-prone portion 5 is formed when conveying powdered materials, a pressure sensor 6 is provided downstream of the blockage-prone portion 5, the pressure sensor 6 is fixedly arranged on the outer wall of the main pipeline 1, and is used for monitoring the pressure in the main pipeline 1 downstream of the blockage-prone portion 5, and when the pressure drops, the blockage-prone portion 5 is blocked;

[0031] The branch pipeline 2 is arranged downstream of the easily blocked part 5, and is fixedly connected to the main pipeline 1 at an angle of 45°. A closed door 4 is arranged inside the junction of the branch pipeline 2 and the main pipeline 1. When the closed door 4 is closed, the powdery material in the main pipeline 1 cannot enter the branch pipeline 2, so as to prevent the powdery material from accumulating in the branch pipeline 2 and causing the branch pipeline 2 to be blocked. When the closed door 4 is opened, the dense phase airflow in the branch pipeline 2 can enter the main pipeline 1 to clear the easily blocked part 5;

[0032] The anti-blocking part 3 includes a No. 1 sealing block 37, a No. 2 sealing block 38 and a sealing part. When the sealing part is located between the No. 1 sealing block 37 and the No. 2 sealing block 38, the anti-blocking part 3 is closed, and the dense-phase airflow cannot flow through the anti-blocking part 3. After the sealing part moves up and leaves the No. 1 sealing block 37, a gap is formed between the sealing part and the No. 1 sealing block 37, and the dense-phase airflow can clear the easily blocked part 5 through the gap. The farther the sealing part is from the No. 1 sealing block 37, the larger the gap formed, the smaller the dense-phase airflow speed, and the smaller the clearing force on the easily blocked part 5. The closer the sealing part is to the No. 1 sealing block 37, the smaller the gap formed, the larger the dense-phase airflow speed, and the larger the clearing force on the easily blocked part 5.

[0033] The closed door 4 includes a door body 41, a pit 42, a pin 43, a torsion spring 44 and a fixing ring 45. The pin 43 is fixed on the front side of the door body 41, and the torsion spring 44 is sleeved on the outer ring of the pin 43. The pin 43 fixes the torsion spring 44 on the surface of the door body 41.

[0034] A plurality of fixing rings 45 are provided at the two legs of the torsion spring 44, half of the fixing rings 45 are fixedly connected to the door body 41 to restrict one leg of the torsion spring 44 to the surface of the door body 41, and half of the fixing rings 45 are fixedly connected to the inner wall of the branch pipe 2 to restrict one leg of the torsion spring 44 to the inner wall of the branch pipe 2. The legs of the torsion spring 44 can slide in the fixing rings 45 to prevent the torsion spring 44 from shaking, causing the door body 41 to fail to close normally and affecting the tightness of the sealing of the closed door 4.

[0035] There are a plurality of pits 42 distributed on the surface of the door body 41 and located on the same side of the door body 41 as the pin 43. When the dense airflow is blown toward the pits 42, it is rebounded, changing the direction of the airflow and blowing toward the easily blocked portion 5. A plurality of pits 42 rebound at the same time, dividing a dense airflow into a plurality of small streams, reducing the contact area between each small dense airflow and the easily blocked portion 5, increasing the pressure on the easily blocked portion 5, and being more conducive to unblocking the easily blocked portion 5.

[0036] The door body 41 is provided with a pin 43 on one side thereof, which is rotatably connected to the side wall of the branch pipeline 2. When the main pipeline 1 conveys powdered materials, the door body 41 is perpendicular to the branch pipeline 2 under the action of the torsion spring 44, and the branch pipeline 2 is separated from the main pipeline 1 to prevent the powdered materials from entering the branch pipeline 2 and causing the branch pipeline 2 to be blocked. When a dense phase airflow passes through the branch pipeline 2, the dense phase airflow overcomes the pulling force of the torsion spring 44, and pushes the door body 41 to rotate, so that the branch pipeline 2 is connected with the main pipeline 1, and the dense phase airflow can enter the main pipeline 1 to clear the easily blocked part 5.

[0037] Both sealing block No. 1 37 and sealing block No. 2 38 are fixedly connected to the inner wall of branch pipeline 2 and are perpendicular to the inner wall of branch pipeline 2. Sealing block No. 1 37 and sealing block No. 2 38 are located on both sides of the sealing portion. Sealing block No. 1 37 is located at the end away from the sealing portion, and sealing block No. 2 38 is located at the end close to the sealing portion. The sealing portion slides between sealing block No. 1 37 and sealing block No. 2 38. The velocity of the dense phase airflow in branch pipeline 2 is changed by changing the size of the gap between sealing block No. 1 37 and the sealing portion.

[0038] The sealing part includes a rotating shaft 31 , a shaft end 32 , a shell 33 , a shell cover 34 , a support sheet 35 and a sealing plug 36 . The shell 33 is fixedly connected to the branch pipeline 2 , and the sealing part is installed on the branch pipeline 2 .

[0039] The rotating shaft 31 is arranged inside the outer shell 33 and is threadedly connected to the outer shell 33. When the rotating shaft 31 rotates, it can move up and down along the outer shell 33. One end of the rotating shaft 31 exposed from the outer shell 33 is fixed with a shaft end 32. The shaft end 32 is in the shape of a hexagonal prism, which is convenient for grasping. The rotating shaft 31 can be rotated by holding the shaft end 32.

[0040] A shell cover 34 is fixedly provided on the top of the shell 33 to separate the sealing part from the outside and prevent foreign particles from entering the anti-blocking part 3, causing the anti-blocking part 3 to lose its function. The shell cover 34 is rotatably connected to the rotating shaft 31.

[0041] A support sheet 35 is fixedly provided at the other end of the rotating shaft 31, and a sealing plug 36 is fixedly provided on the outer surface of the support sheet 35. The support sheet 35 fixes the sealing plug 36 at the end of the rotating shaft 31. The rotating shaft 31 can drive the sealing plug 36 to move. The sealing plug 36 moves between the No. 1 sealing block 37 and the No. 2 sealing block 38 to adjust the flow rate of the dense phase airflow in the branch pipeline 2.

[0042] The dense phase airflow of compressed air transports the powdered material in the main pipeline 1. After a period of transportation, due to temperature, humidity and other factors, the material adheres to the inner wall of the main pipeline 1 or valves, instruments, etc., blocking the main pipeline 1 and forming a blockage-prone area 5. The air pressure of the main pipeline 1 downstream of the blockage-prone area 5 decreases, and the pressure sensor 6 sounds an alarm, warning the worker that there is a blockage in the main pipeline 1. The compressed air of the main pipeline 1 is turned off, and the transportation of the material is stopped. According to the position of the pressure sensor 6 that issued the alarm, the blockage location is determined, and the compressed air is connected to the branch pipeline. 2, blow dense phase airflow into the branch pipeline 2, open the corresponding anti-blocking part 3, hold the shaft end 32 and rotate it, drive the rotating shaft 31 to rotate, the rotating shaft 31 rises in the shell 33, drive the sealing plug 36 to move to the shell 33 in the branch pipeline 2, with the movement of the sealing plug 36, a gap appears between the sealing plug 36 and the No. 1 sealing block 37, and the dense phase airflow continues to move forward through the gap. Since the cross-sectional area of ​​the gap is smaller than the cross-sectional area of ​​the branch pipeline 2, the speed of the dense phase airflow passing through the gap is accelerated, and the accelerated dense phase airflow blows toward the closed door 4, generating great pressure on the closed door 4 , overcoming the elastic force of the torsion spring 44 to push the door body 41 to rotate around the side wall of the branch pipeline 2, a gap appears between the closed door 4 and the side wall of the branch pipeline 2, and the closed door 4 loses its sealing effect on the branch pipeline 2. The accelerated dense phase airflow blows toward the pit 42 of the door body 41 and then rebounds, and blows toward the easily blocked part 5 against the direction of the airflow of the main pipeline 1. Since the materials accumulated in the easily blocked part 5 are stacked layer by layer along the direction of the airflow of the main pipeline 1, the reverse airflow can easily blow down the materials accumulated in the easily blocked part 5, dredge the main pipeline 1, and allow the material transportation to continue; After the main pipeline 1 is unblocked, the compressed air of the branch pipeline 2 is closed, the pressure of the dense phase airflow on the closed door 4 disappears, the torsion spring 44 rebounds, and drives the door body 41 to return to its original position, separating the branch pipeline 2 from the main pipeline 1, preventing materials from entering the branch pipeline 2 and accumulating, blocking the branch pipeline 2, and making the anti-blocking part 3 lose its anti-blocking function; the speed of the dense phase airflow in the branch pipeline 2 blowing to the closed door 4 can be adjusted by rotating the shaft end 32. When the rotating shaft end 32 drives the sealing plug 36 to move between the No. 1 sealing block 37 and the No. 2 sealing block 38, the anti-blocking part 3 is closed, and the dense phase airflow cannot pass through;The shaft end 32 is continuously rotated to drive the sealing plug 36 to move upward and away from the No. 1 sealing block 37. A gap appears between the sealing plug 36 and the No. 1 sealing block 37. As the sealing plug 36 moves upward, the gap becomes larger and larger. When the sealing plug 36 moves to the bottom of the housing 33, the gap is the largest. The larger the gap, the smaller the speed of the dense phase airflow blowing toward the closed door 4. On the contrary, the smaller the gap, the larger the speed of the dense phase airflow blowing toward the closed door 4. The speed of the dense phase airflow blowing toward the closed door 4 is adjusted according to the blockage of the easily blocked part 5 to dredge the main line 1. The easily blocked part 5 of the main line 1 is dredged separately, which reduces the consumption of compressed air. By adjusting the anti-blocking part 3, the easily blocked part 5 can be dredged without increasing the pressure of the compressed air, which reduces energy consumption and operating costs, and also reduces the investment in equipment. ;

[0043] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. Anti-blocking device for pneumatic conveying of powdered materials, characterized in that: include: A main pipe (1), the main pipe (1) is used to transport powdery materials, the main pipe (1) is provided with instruments, valves, etc., and a portion (5) prone to clogging is formed when the powdery materials are transported, a pressure sensor (6) is provided downstream of the portion (5) prone to clogging, the pressure sensor (6) is fixedly mounted on the outer wall of the main pipe (1), and is used to monitor the pressure in the main pipe (1) downstream of the portion (5) prone to clogging. If the pressure drops, the portion (5) prone to clogging is clogged; A branch pipeline (2), wherein the branch pipeline (2) is arranged downstream of the easily blocked portion (5), and is fixedly connected to the main pipeline (1) at a certain angle. A closed door (4) is arranged inside the junction of the branch pipeline (2) and the main pipeline (1). When the closed door (4) is closed, the powdered material in the main pipeline (1) cannot enter the branch pipeline (2). When the closed door (4) is opened, the dense phase gas flow in the branch pipeline (2) can enter the main pipeline (1), thereby clearing the easily blocked portion (5); The anti-blocking part (3) comprises a No. 1 sealing block (37), a No. 2 sealing block (38) and a sealing part. When the sealing part is located between the No. 1 sealing block (37) and the No. 2 sealing block (38), the anti-blocking part (3) is closed and the dense-phase airflow cannot flow through the anti-blocking part (3). After the sealing part moves upward and leaves the No. 1 sealing block (37), a gap is formed between the sealing part and the No. 1 sealing block (37), and the dense-phase airflow can pass through the gap to clear the easily blocked part (5). The farther the sealing part is from the No. 1 sealing block (37), the larger the gap formed and the smaller the dense-phase airflow speed. The closer the sealing part is to the No. 1 sealing block (37), the smaller the gap formed and the larger the dense-phase airflow speed.

2. The anti-blocking device for pneumatic conveying of powdered materials according to claim 1, characterized in that: The closed door (4) comprises a door body (41), a recess (42), a pin (43), a torsion spring (44) and a fixing ring (45); the pin (43) is fixedly arranged on the front side of the door body (41), and the torsion spring (44) is sleeved on the outer ring of the pin (43).

3. The anti-blocking device for pneumatic conveying of powdered materials according to claim 2, characterized in that: A plurality of fixing rings (45) are provided at both legs of the torsion spring (44), half of which are fixedly connected to the door body (41) to restrict one leg of the torsion spring (44) to the surface of the door body (41), and half of which are fixedly connected to the inner wall of the branch pipe (2) to restrict one leg of the torsion spring (44) to the inner wall of the branch pipe (2), and the leg of the torsion spring (44) can slide in the fixing ring (45).

4. The anti-blocking device for pneumatic conveying of powdered materials according to claim 2, characterized in that: There are a plurality of pits (42) distributed on the surface of the door body (41) and located on the same side of the door body (41) as the pin (43). When the dense phase airflow blows toward the pits (42), it is rebounded, changing the direction of the airflow and blowing toward the easily blocked part (5).

5. The anti-blocking device for pneumatic conveying of powdery materials according to claim 2, characterized in that: The door body (41) is provided with a pin (43) on one side thereof which is rotatably connected to the side wall of the branch pipeline (2). When the main pipeline (1) conveys powdered materials, the door body (41) is perpendicular to the branch pipeline (2) under the action of the torsion spring (44), thereby isolating the branch pipeline (2) from the main pipeline (1). When dense phase airflow passes through the branch pipeline (2), the dense phase airflow overcomes the pulling force of the torsion spring (44), pushes the door body (41) to rotate, and the branch pipeline (2) is connected to the main pipeline (1).

6. The anti-blocking device for pneumatic conveying of powdered materials according to claim 1, characterized in that: The No. 1 sealing block (37) and the No. 2 sealing block (38) are both fixedly connected to the inner wall of the branch pipeline (2) and are perpendicular to the inner wall of the branch pipeline (2). The No. 1 sealing block (37) and the No. 2 sealing block (38) are located on both sides of the sealing portion. The No. 1 sealing block (37) is located at an end away from the sealing portion, and the No. 2 sealing block (38) is located at an end close to the sealing portion.

7. The anti-blocking device for pneumatic conveying of powdered materials according to claim 1, characterized in that: The sealing part comprises a rotating shaft (31), a shaft end (32), a shell (33), a shell cover (34), a supporting sheet (35) and a sealing plug (36); the shell (33) is fixedly connected to the branch pipeline (2), and the sealing part is installed on the branch pipeline (2).

8. The anti-blocking device for pneumatic conveying of powdery materials according to claim 7, characterized in that: The rotating shaft (31) is arranged inside the outer shell (33) and is threadedly connected to the outer shell (33). When the rotating shaft (31) rotates, it can move up and down along the outer shell (33). One end of the rotating shaft (31) exposed from the outer shell (33) is fixedly provided with a shaft end (32). The rotating shaft (31) can be rotated by holding the shaft end (32).

9. The anti-blocking device for pneumatic conveying of powdered materials according to claim 7, characterized in that: A shell cover (34) is fixedly provided on the top of the shell (33) to separate the sealing portion from the outside, and the shell cover (34) is rotatably connected to the rotating shaft (31).

10. The anti-blocking device for pneumatic conveying of powdery materials according to claim 7, characterized in that: A support sheet (35) is fixedly provided at the other end of the rotating shaft (31), and a sealing plug (36) is fixedly provided on the outer surface of the support sheet (35). The support sheet (35) fixes the sealing plug (36) to the end of the rotating shaft (31), and the rotating shaft (31) can drive the sealing plug (36) to move.

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