Vacuum degassing device for coal sample detection
The vacuum degassing device with multi-stage filtration and activated carbon purification solves the problem of dust emissions in coal sample detection, achieving a safe working environment and stable operation of the equipment.
Patent Information
- Application Number
- CN202422035059.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-21
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-08-21
AI Technical Summary
During the coal sample detection process, the gas discharged from the vacuum pump contains a large amount of dust, which leads to high concentration of dust in the air around the equipment, which can easily cause poisoning or health problems for staff.
A vacuum degassing device is designed, including a gas filter box, a first filter box and a second filter box. The gas is filtration through the filter parts and the filter mesh structure in the filter box, and the particles on the surface of the filter mesh are cleaned up in combination with a dust sweeping plate and a dust exhaust pipe to prevent clogging, and the gas is purified by activated carbon.
It effectively filters the dust in the gas discharged by the vacuum pump, avoids the health hazards of dust to the staff, maintains the long-term working ability of the filtering equipment, prevents abnormal noise and vibration of the vacuum pump, and extends the equipment life.
Smart Images
Figure CN223122633U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vacuum degassing, and particularly relates to a vacuum degassing device for coal sample detection. Background Art
[0002] Coal analysis includes coal sampling, reduction, crushing, sample preparation, and coal analysis. The main detection items are total sulfur, calorific value, coal moisture (total moisture, analytical moisture), ash content, volatile matter, fixed carbon, carbon, hydrogen, ash fusibility, carbon content in slag, coking coal, petroleum coke, briquette, etc. During the coal sample detection process, a vacuum degassing device is used to detect the coal sample.
[0003] The coal sample is a coal block, and a large amount of dust usually adheres to the surface of the coal block. During the vacuum degassing process, small particles on the surface of the coal block are easily shed and sucked into the vacuum pump. Therefore, during the vacuum suction operation, the gas discharged by the vacuum pump will contain a large amount of dust, resulting in a large amount of dust in the air around the equipment. It is easy for the surrounding staff to inhale the dust-containing gas into the body, and long-term work is likely to cause gas poisoning or other health problems, posing a potential threat to human health.
[0004] Therefore, a vacuum degassing device for coal sample detection is specifically proposed. Content of the Utility Model
[0005] Aiming at the problems existing in the prior art, the purpose of the utility model is to provide a vacuum degassing device for coal sample detection, which can achieve the purpose of filtering the gas discharged by the vacuum pump, and avoid the problem that the gas discharged by the vacuum pump contains a large amount of dust during the vacuum suction operation, thereby preventing the staff from being prone to gas poisoning or other health problems.
[0006] To solve the above problems, the utility model adopts the following technical solutions.
[0007] A vacuum degassing device for coal sample detection includes a workbench. Four corner positions at the bottom of the workbench are fixedly installed with universal wheels. The middle position at the top of the workbench is fixedly installed with a vacuum pump. The right side position at the top of the workbench is fixedly installed with a vacuum tank. The left side position at the top of the workbench is fixedly installed with a gas filtration box. The right side of the top of the vacuum pump is fixedly installed with an air extraction pipe, and the air extraction pipe is fixedly connected to the top of the vacuum tank. The left side of the top of the vacuum pump is fixedly installed with a first exhaust pipe, and the first exhaust pipe is fixedly connected to the front end of the gas filtration box.
[0008] The front and rear ends inside the gas filtration box are respectively provided with a first filtration chamber and a second filtration chamber. An air vent is provided between the first filtration chamber and the second filtration chamber. A first filtration component is placed inside the first filtration chamber, and a second filtration component is placed inside the second filtration chamber. A second exhaust pipe is fixedly installed at the rear end of the gas filtration box, and the second exhaust pipe communicates with the second filtration chamber.
[0009] Further, the first filtration component includes a first filtration box which is placed inside the first filtration chamber. A first handle is fixedly installed at the top of the first filtration box. A ventilation slot is provided inside the first filtration box, and a second filter screen is fixedly installed inside the ventilation slot.
[0010] Further, a fan blade is movably installed at the rear end of the second filter screen inside the ventilation slot. A linkage column is fixedly installed at the center of the front end of the fan blade. The linkage column penetrates and extends to the front end of the second filter screen, and a dust sweeping plate is fixedly installed at the side part of the front end of the linkage column.
[0011] Further, a dust discharge pipe is fixedly installed inside the left side of the first filtration box. The bottom end of the dust discharge pipe is communicated with the inside of the ventilation slot, and the communication part is located at the front end of the second filter screen. The top end of the dust discharge pipe extends to the top of the first filtration box.
[0012] Further, the second filtration component includes a second filtration box which is placed inside the second filtration chamber. A second handle is fixedly installed at the top of the second filtration box, and activated carbon is filled inside the second filtration box.
[0013] Further, an exhaust slot is provided at the top inside the vacuum tank. The top of the exhaust slot is fixedly connected with the suction pipe, and a filtration component is arranged inside the exhaust slot.
[0014] Further, the filtration component includes a first filter screen and a sphere. Rotating grooves and moving grooves are provided from top to bottom on both inner walls of the exhaust slot. The first filter screen is movably installed inside the exhaust slot through the moving groove, and the sphere is movably installed inside the exhaust slot through the rotating groove.
[0015] Further, moving blocks are fixedly installed at both the front and rear ends of the first filter screen. Springs are fixedly installed at the tops of the two groups of moving blocks. The moving blocks and springs on both sides of the first filter screen are located inside a group of moving grooves.
[0016] Further, rotating columns are fixedly installed at both the front and rear ends of the sphere. Wind resistance plates are fixedly installed at both the upper and lower ends of the sphere. Grooves are respectively provided on the sides of the two groups of wind resistance plates away from the sphere, and top balls are movably installed inside the grooves.
[0017] Further, the sphere is located above the first filter screen. The filter screen of the first filter screen is concave when the vacuum tank is not evacuated and convex when the vacuum tank is evacuated. When the sphere rotates, both the wind resistance plate and the top ball can contact the convex first filter screen.
[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0019] (1) In this solution, through the design of the gas filtration box, the vacuum pump is connected to the gas filtration box through the first exhaust pipe. The gas filtration box is provided with a first filtration box and a second filtration box for filtering gas. The purpose of filtering the discharged gas is achieved through the first filtration box and the second filtration box, solving the problem that the gas discharged by the vacuum pump contains a large amount of dust, and avoiding the problem that a large amount of dust in the air around the equipment can easily cause gas poisoning or other health problems for the staff.
[0020] (2) In this solution, through the setting of the second filter screen, fan blades, linkage columns, dust sweeping plates, and dust discharge pipes, the long-term gas filtration ability of the second filter screen can be maintained, avoiding excessive accumulation of particles on the surface of the second filter screen, resulting in blockage, making the exhaust unsmooth and affecting the subsequent operation of the second filtration box.
[0021] (3) In this solution, through the setting of structures such as exhaust grooves, the first filter screen, the sphere, the rotating column, and the wind resistance plate, the dust particles filtered by the first filter screen can be knocked down, avoiding blockage of the sieve holes caused by the dust particles accumulated on the surface of the first filter screen, affecting the air extraction work of the vacuum pump on the vacuum tank. At the same time, the setting of the first filter screen can prevent solid particles from entering the vacuum pump, resulting in abnormal noise or strong vibration when the vacuum pump is working.
[0022] (4) In this solution, through the setting of structures such as the wind resistance plate, the groove, and the top ball, the particles stuck in the sieve holes of the first filter screen can be extruded, further improving the ability of the first filter screen to prevent dust particle blockage. At the same time, a part of the dust particles can be prevented from entering the vacuum pump, and a part of the dust particles can also be prevented from being discharged through the vacuum pump, further reducing the content of dust particles in the gas discharged by the vacuum pump. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] Figure 1 is a schematic diagram of the overall structure of the present utility model;
[0024] Figure 2 is a schematic diagram of the internal planar structure of the gas filtration box of the present utility model;
[0025] Figure 3 is a schematic diagram of the structure of the first filtration component of the present utility model;
[0026] Figure 4 is a schematic diagram of the planar structure of the first filtration component of the present utility model;
[0027] Figure 5 Schematic diagram of the second filter component structure of the present utility model;
[0028] Figure 6 Schematic diagram of the vacuum tank structure of the present utility model;
[0029] Figure 7 Schematic diagram of the enlarged detailed structure at location A of the present utility model;
[0030] Figure 8 Schematic diagram of the filter component structure of the present utility model.
[0031] In the figure: 1, workbench; 11, universal wheels; 2, vacuum pump; 21, suction pipe; 22, first exhaust pipe; 3, vacuum tank; 31, exhaust groove; 32, filter assembly; 321, moving groove; 322, first filter screen; 323, moving block; 324, spring; 325, rotating groove; 326, sphere; 327, rotating column; 328, air resistance plate; 329, groove; 3210, top ball; 4, gas filter box; 41, second exhaust pipe; 42, first filter chamber; 43, second filter chamber; 44, ventilation hole; 45, first filter component; 451, first filter box; 452, first handle; 453, ventilation groove; 454, second filter screen; 455, fan blade; 456, linkage column; 457, dust sweeping plate; 458, dust discharge pipe; 46, second filter component; 461, second filter box; 462, second handle; 463, activated carbon. Specific embodiments
[0032] The following further describes the present utility model with reference to the accompanying drawings.
[0033] As Figures 1 to 8 shown:
[0034] The utility model relates to a vacuum degassing device for coal sample detection, which comprises a workbench 1. Four corner positions at the bottom of the workbench 1 are fixedly installed with universal wheels 11. The middle position at the top of the workbench 1 is fixedly installed with a vacuum pump 2. The right side position at the top of the workbench 1 is fixedly installed with a vacuum tank 3. The left side position at the top of the workbench 1 is fixedly installed with a gas filter box 4. The right side of the top of the vacuum pump 2 is fixedly installed with an air extraction pipe 21, and the air extraction pipe 21 is fixedly connected with the top of the vacuum tank 3. The left side of the top of the vacuum pump 2 is fixedly installed with a first exhaust pipe 22, and the first exhaust pipe 22 is fixedly connected with the front end of the gas filter box 4. The front and rear ends inside the gas filter box 4 are respectively provided with a first filter chamber 42 and a second filter chamber 43. An air vent 44 is arranged between the first filter chamber 42 and the second filter chamber 43. A first filter component 45 is placed inside the first filter chamber 42. A second filter component 46 is placed inside the second filter chamber 43. The rear end of the gas filter box 4 is fixedly installed with a second exhaust pipe 41, and the second exhaust pipe 41 communicates with the second filter chamber 43. The second filter component 46 comprises a second filter box 461. The second filter box 461 is placed inside the second filter chamber 43. The top of the second filter box 461 is fixedly installed with a second handle 462. The inside of the second filter box 461 is filled with activated carbon 463.
[0035] By adopting the above technical solution, during use, the coal sample is placed into the vacuum tank 3, and then the vacuum tank 3 is closed. The vacuum pump 2 is started. When the vacuum pump 2 is working, it evacuates the inside of the vacuum tank 3 through the suction pipe 21. During the evacuation process, the dust particles in the vacuum tank 3 will enter the vacuum tank 3. The vacuum tank 3 discharges gas through the first exhaust pipe 22. The gas enters the gas filtration box 4 through the first exhaust pipe 22. After the gas enters the gas filtration box 4, it will first pass through the filtration of the first filter box 451 in the first filtration chamber 42. The first filter box 451 can filter the larger particles contained in the gas. The gas filtered by the first filter box 451 is then discharged into the second filtration chamber 43 through the ventilation hole 44. The second filter box 461 in the second filtration chamber 43 purifies the gas through the activated carbon 463 filled inside. The activated carbon 463 adsorbs the tiny dust contained in the gas, thereby completely filtering the gas and avoiding a large amount of dust in the gas discharged by the vacuum pump 2. The gas filtered by the activated carbon 463 in the second filter box 461 is then discharged to the outside through the second exhaust pipe 41, avoiding the problem that the discharged gas has a large dust content, resulting in a large amount of dust in the surrounding air and causing health problems for the staff due to inhalation of a large amount of dust. The gas is first filtered by the first filter box 451 to achieve preliminary filtration of the gas, which can extend the service life of the activated carbon 463 in the second filter box 461. The top parts of the first filter box 451 and the second filter box 461 are respectively equipped with a first handle 452 and a second handle 462. After long-term use, the first filter box 451 and the second filter box 461 can be taken out from the first filtration chamber 42 and the second filtration chamber 43 through the first handle 452 and the second handle 462 for cleaning. During installation, the first filter box 451 and the second filter box 461 can be directly placed into the first filtration chamber 42 and the second filtration chamber 43. Sealing rubber strips are provided at the tops of the first filtration chamber 42 and the second filtration chamber 43 to prevent the gas from directly discharging through the first filtration chamber 42 and the second filtration chamber 43.
[0036] Such as Figures 1 to 5As shown in the figure, the first filtering component 45 includes a first filtering box 451 which is placed in the first filtering chamber 42. A first handle 452 is fixedly installed at the top of the first filtering box 451. A ventilation groove 453 is formed inside the first filtering box 451. A second filter screen 454 is fixedly installed inside the ventilation groove 453. A fan blade 455 is movably installed at the rear end of the second filter screen 454 inside the ventilation groove 453. A linkage column 456 is fixedly installed at the center of the front end of the fan blade 455. The linkage column 456 penetrates and extends to the front end of the second filter screen 454. A dust sweeping plate 457 is fixedly installed at the front side of the front end of the linkage column 456. A dust discharging pipe 458 is fixedly installed inside the left side of the first filtering box 451. The bottom end of the dust discharging pipe 458 is communicated with the inside of the ventilation groove 453, and the communicating part is located at the front end of the second filter screen 454. The top end of the dust discharging pipe 458 extends to the top of the first filtering box 451.
[0037] By adopting the above technical solution, a ventilation groove 453 is formed inside the first filtering box 451, and a second filter screen 454 and a fan blade 455 are installed inside the ventilation groove 453. When the gas passes through the ventilation groove 453, it will be first filtered by the second filter screen 454. The second filter screen 454 retains larger particles outside. The gas passing through the second filter screen 454 will drive the fan blade 455 to rotate. A linkage column 456 is installed at the front end of the fan blade 455. The front end of the linkage column 456 penetrates the ventilation groove 453, and a dust sweeping plate 457 is installed at the front side of the front end of the linkage column 456. The dust sweeping plate 457 is attached to the second filter screen 454. When the fan blade 455 rotates, it drives the dust sweeping plate 457 to rotate through the linkage column 456. The dust sweeping plate 457 rotates along the surface of the second filter screen 454 to clean the particles filtered on its surface. The dust sweeping plate 457 is located inside the ventilation groove 453. When the dust sweeping plate 457 drives the particles to rotate, it can ensure that the particles are always located inside the ventilation groove 453. Finally, the particles are driven to the communication port of the dust discharging pipe 458 and the ventilation groove 453, and the particles are pushed into the dust discharging pipe 458 due to the continuous rotation of the dust sweeping plate 457. As the working time increases, the dust sweeping plate 457 continuously cleans the particles filtered on the surface of the second filter screen 454 and brings the particles into the dust discharging pipe 458. Particles accumulate in the dust discharging pipe 458. With the continuous accumulation of particles, finally the particles will be discharged through the surface of the dust discharging pipe 458. Thus, the purpose of cleaning the particles filtered on the surface of the second filter screen 454 is achieved. At the same time, the particles can be discharged to the outside of the first filtering box 451 through the dust discharging pipe 458. Through the structural design here, the long-term gas filtering ability of the second filter screen 454 can be maintained, and it can be avoided that too many particles accumulate on the surface of the second filter screen 454 to cause blockage, resulting in unsmooth exhaust and affecting the subsequent work of the second filtering box 461.
[0038] As Figures 6 to 8As shown in the figure, an exhaust groove 31 is formed at the top inside the vacuum tank 3. The top of the exhaust groove 31 is fixedly connected to the air extraction pipe 21. A filtering component 32 is arranged inside the exhaust groove 31. The filtering component 32 includes a first filter screen 322 and a sphere 326. Rotating grooves 325 and moving grooves 321 are formed in the inner walls on both sides of the exhaust groove 31 from top to bottom. The first filter screen 322 is movably installed in the exhaust groove 31 through the moving groove 321. The sphere 326 is movably installed in the exhaust groove 31 through the rotating groove 325. Moving blocks 323 are fixedly installed at the front and rear ends of the first filter screen 322. Springs 324 are fixedly installed at the tops of the two groups of moving blocks 323. The moving blocks 323 and the springs 324 on both sides of the first filter screen 322 are both located in a group of moving grooves 321. Rotating columns 327 are fixedly installed at the front and rear ends of the sphere 326. Air resistance plates 328 are fixedly installed at the upper and lower ends of the sphere 326. Grooves 329 are respectively formed on one sides of the two groups of air resistance plates 328 away from the sphere 326. Top balls 3210 are movably installed inside the grooves 329.
[0039] By adopting the above technical solution, the air extraction pipe 21 is communicated with the inside of the vacuum tank 3 through the exhaust groove 31. When the vacuum pump 2 extracts air from the inside of the vacuum tank 3 through the air extraction pipe 21, the first filter screen 322 can filter dust particles in the air. At the same time, as the air pressure inside the vacuum tank 3 continuously increases, the first filter screen 322 will continuously rise along the moving groove 321 through the moving block 323. At the same time, the spring 324 is in a compressed state, and the first filter screen 322 changes from a concave shape to a convex shape. At the same time, the sphere 326 rotates by relying on the rotating column 327 and the rotating groove 325 under the influence of air circulation through the air resistance plates 328 installed at the upper and lower ends. When the first filter screen 322 rises to a certain height, the air resistance plates 328 that rotate through the sphere 326 and the rotating column 327 will touch the first filter screen 322. Therefore, the dust particles filtered by the first filter screen 322 can be knocked down, avoiding the problem that the dust particles accumulated on the surface of the first filter screen 322 cause the sieve holes to be blocked, affecting the air extraction work of the vacuum pump 2 on the vacuum tank 3. At the same time, the setting of the first filter screen 322 can prevent solid particles from entering the vacuum pump 2, resulting in abnormal noise or strong vibration when the vacuum pump 2 is working.
[0040] As Figures 7 to 8 shown in the figure, the sphere 326 is located above the first filter screen 322. The filter screen of the first filter screen 322 is in a concave shape when the vacuum tank 3 is not evacuated and in a convex shape when the vacuum tank 3 is evacuated. When the sphere 326 rotates, both the air resistance plate 328 and the top ball 3210 can contact the convex first filter screen 322.
[0041] By adopting the above technical solution, grooves 329 are provided at the ends of the two sets of air resistance plates 328, and top balls 3210 are movably installed in the grooves 329. When the first filter screen 322 rises to a position where the air resistance plate 328 can touch the screen, the top balls 3210 can rotate along the screen. The top balls 3210 protrude outside the air resistance plate 328. Therefore, the top balls 3210 can penetrate into the screen holes of the first filter screen 322. Through this structural design, the particles stuck in the screen holes of the first filter screen 322 can be better extruded, further improving the ability of the first filter screen 322 to prevent dust particle blockage. At the same time, the design of the filter assembly 32 structure can prevent some dust particles from entering the vacuum pump 2 and also prevent some dust particles from being discharged through the vacuum pump 2, further reducing the content of dust particles in the gas discharged by the vacuum pump 2.
[0042] Usage method: Place the coal sample to be tested into the vacuum tank 3, start the vacuum pump 2. The vacuum pump 2 evacuates the inside of the vacuum tank 3 through the suction pipe 21. While the vacuum pump 2 is extracting the air inside the vacuum tank 3, the filter assembly 32 provided in the exhaust groove 31 can prevent and reduce the possibility of dust particles entering the vacuum pump 2, avoiding the accumulation of particles inside the vacuum pump 2 after long-term operation, which may cause abnormal noises and vibrations during the operation of the vacuum pump 2, or even damage the vacuum pump 2. The air extracted by the vacuum pump 2 is discharged into the gas filter box 4 through the first exhaust pipe 22. The air first enters the first filter chamber 42 and is filtered by the first filter box 451. Then the gas filtered by the first filter box 451 is discharged into the second filter chamber 43 through the ventilation hole 44. The gas is further filtered by the second filter box 461 and finally discharged through the second exhaust pipe 41.
[0043] The embodiments in the present utility model are only used to illustrate the present utility model and do not constitute a limitation to the scope of the claims. Other substantially equivalent alternatives that can be conceived by those skilled in the art are within the protection scope of the present utility model.
Claims
1. A vacuum degassing device for coal sample detection, characterized in that, It includes a workbench (1), and is characterized in that: universal wheels (11) are fixedly installed at four corner positions at the bottom of the workbench (1), a vacuum pump (2) is fixedly installed at the middle position at the top of the workbench (1), a vacuum tank (3) is fixedly installed at the right position at the top of the workbench (1), a gas filter box (4) is fixedly installed at the left position at the top of the workbench (1), an air extraction pipe (21) is fixedly installed at the right side at the top of the vacuum pump (2), the air extraction pipe (21) is fixedly connected to the top of the vacuum tank (3), a first exhaust pipe (22) is fixedly installed at the left side at the top of the vacuum pump (2), and the first exhaust pipe (22) is fixedly connected to the front end of the gas filter box (4); A first filter chamber (42) and a second filter chamber (43) are respectively formed at the front and rear ends inside the gas filter box (4), a ventilation hole (44) is formed between the first filter chamber (42) and the second filter chamber (43), a first filter component (45) is placed inside the first filter chamber (42), a second filter component (46) is placed inside the second filter chamber (43), a second exhaust pipe (41) is fixedly installed at the rear end of the gas filter box (4), and the second exhaust pipe (41) communicates with the second filter chamber (43).
2. The vacuum degassing device for coal sample detection according to claim 1, characterized in that: The first filter component (45) includes a first filter box (451), the first filter box (451) is placed inside the first filter chamber (42), a first handle (452) is fixedly installed at the top of the first filter box (451), a ventilation groove (453) is formed inside the first filter box (451), and a second filter net (454) is fixedly installed inside the ventilation groove (453).
3. The vacuum degassing device for coal sample detection according to claim 2, characterized in that: A fan blade (455) is movably installed at the rear end of the second filter net (454) inside the ventilation groove (453), a linkage column (456) is fixedly installed at the center of the front end of the fan blade (455), the linkage column (456) penetrates and extends to the front end of the second filter net (454), and a dust sweeping plate (457) is fixedly installed at the side of the front end of the linkage column (456).
4. A vacuum degassing device for coal sample detection according to claim 2, characterized in that: A dust discharge pipe (458) is fixedly installed inside the left side of the first filter box (451), the bottom end of the dust discharge pipe (458) is communicated with the inside of the ventilation groove (453), and the communication position is located at the front end of the second filter net (454), and the top end of the dust discharge pipe (458) extends to the top of the first filter box (451).
5. A vacuum degassing device for coal sample detection according to claim 1, characterized in that: The second filter component (46) includes a second filter box (461), the second filter box (461) is placed inside the second filter chamber (43), a second handle (462) is fixedly installed at the top of the second filter box (461), and activated carbon (463) is filled inside the second filter box (461).
6. A vacuum degassing device for coal sample detection according to claim 1, characterized in that: An exhaust groove (31) is formed at the top inside the vacuum tank (3), the top of the exhaust groove (31) is fixedly connected to the air extraction pipe (21), and a filter assembly (32) is arranged inside the exhaust groove (31).
7. A vacuum degassing device for coal sample detection according to claim 6, characterized in that: The filtering component (32) includes a first filter screen (322) and a sphere (326). On both inner walls of the exhaust groove (31), a rotating groove (325) and a moving groove (321) are formed from top to bottom. The first filter screen (322) is movably installed in the exhaust groove (31) through the moving groove (321), and the sphere (326) is movably installed in the exhaust groove (31) through the rotating groove (325).
8. A vacuum degassing device for coal sample detection according to claim 7, characterized in that: Moving blocks (323) are fixedly installed at both the front and rear ends of the first filter screen (322). Springs (324) are fixedly installed at the tops of the two groups of moving blocks (323). The moving blocks (323) and springs (324) on both sides of the first filter screen (322) are both located in a group of moving grooves (321).
9. A vacuum degassing device for coal sample detection according to claim 7, characterized in that: Rotating columns (327) are fixedly installed at both the front and rear ends of the sphere (326). Air resistance plates (328) are fixedly installed at both the upper and lower ends of the sphere (326). Grooves (329) are respectively formed on one sides of the two groups of air resistance plates (328) away from the sphere (326). Top balls (3210) are movably installed inside the grooves (329).
10. A vacuum degassing device for coal sample detection according to claim 7, characterized in that: The sphere (326) is located above the first filter screen (322). The filter screen of the first filter screen (322) is concave when the vacuum tank (3) is not evacuated and convex when the vacuum tank (3) is evacuated. When the sphere (326) rotates, the air resistance plate (328) and the top ball (3210) can both contact the convex first filter screen (322).