Online calibration device and calibration method for gas float flowmeter

Abstract

The invention discloses an online calibration device and method for a gas float flowmeter in the technical field of gas float flowmeters.The online calibration device comprises a fixing frame and a communicating pipe, the communicating pipe is provided with a gas source connector, and the communicating pipe is sequentially communicated with a pressure reducing valve, a temperature transmitter, a pressure transmitter, a float flowmeter and a Coriolis mass flowmeter; when a gas inlet calibration opening of the gas float flowmeter to be calibrated is in contact with the rubber ring, the conical rubber sleeve is inflated and expanded, the outer ring of the conical rubber sleeve can be clamped in the gas inlet calibration opening of the gas float flowmeter to be calibrated after being expanded, and then after calibration is finished, the valve is opened, so that air in the inner cavity is exhausted, and the gas float flowmeter to be calibrated is calibrated. When the gas float flowmeter is calibrated, the conical rubber sleeve can be shrunk, large friction does not need to be generated between the gas inlet calibration opening of the gas float flowmeter after calibration and the conical rubber sleeve, and therefore the situation that the installation stability of the conical rubber sleeve is affected by large friction force when the gas float flowmeter is taken down is avoided.

Description

Technical Field

[0001] This invention relates to the field of gas float flowmeter technology, specifically to an online calibration device and calibration method for a gas float flowmeter. Background Technology

[0002] A search revealed that CN215003861U discloses an online calibration device for a gas float flowmeter. This device utilizes a low-elasticity conical rubber sleeve with a vent hole in the center of the calibration connector. This allows it to connect to gas float flowmeters with different orifice sizes when being calibrated. The low-elasticity rubber provides better airtightness, increasing calibration efficiency and accuracy. During use, after the gas float flowmeter is fixed to the connecting plate, rotating the adjusting screw moves the connecting plate closer to the calibration connector. When the gas float flowmeter's inlet calibration port connects to the calibration connector, the adjusting screw is rotated until the calibration connector is fully engaged within the gas float flowmeter's inlet calibration port, further enhancing the airtightness of the connection.

[0003] However, the applicant found that when disassembling the gas float flowmeter by clamping the conical rubber sleeve inside the air inlet calibration port, the large frictional force of the clamping can easily affect the stability of the conical rubber sleeve installation. Moreover, after long-term and repeated use, the conical rubber sleeve is prone to excessive wear. Therefore, we propose an online calibration device and calibration method for gas float flowmeters. Summary of the Invention

[0004] The purpose of this invention is to provide an online calibration device and calibration method for a gas float flowmeter to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an online calibration device for a gas float flowmeter, comprising a fixed frame and a connecting pipe, wherein a gas source interface is provided on the connecting pipe, and a pressure reducing valve, a temperature transmitter, a pressure transmitter, a float flowmeter and a Coriolis mass flowmeter are sequentially connected to the connecting pipe, and the pressure reducing valve, the temperature transmitter, the pressure transmitter, the float flowmeter and the Coriolis mass flowmeter are all mounted on the fixed frame; The fixing frame is equipped with fixing components; The fixing component includes a vertical plate with a connecting frame. A screw runs horizontally through the connecting frame, and a connecting plate is rotatably connected to the left end of the screw. A guide rod runs through the connecting frame on the connecting plate. A support block and two sets of identical electric telescopic rods are provided on the connecting plate, and each electric telescopic rod has a movable block at its output end. A fixing pipe connected to a connecting pipe runs horizontally through the vertical plate. A rubber ring is provided on the right side of the vertical plate, and a conical rubber sleeve is provided on the right side of the rubber ring. Both the rubber ring and the conical rubber sleeve are fitted over the fixing pipe. An inner cavity is provided inside the conical rubber sleeve, and an exhaust pipe and an air supply pipe are provided on the conical rubber sleeve. A valve is provided on the exhaust pipe. The air supply pipe is connected to an inflation component, and a filter component is connected to the inflation component.

[0006] In a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, the air filling component includes an air pump mounted on a vertical plate, the air pump being connected to an air delivery pipe, and an air inlet pipe being mounted on the air pump.

[0007] In a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, the filter assembly includes a fixing rod mounted on a vertical plate, a filter box connected to an air inlet pipe mounted on the fixing rod, a through hole on the left side of the filter box, a bottom plate on the bottom inner wall of the filter box, a filter plate attached to the top of the bottom plate, a top plate on the top of the filter plate, and a support rod penetrating the top of the filter box on the top of the top plate.

[0008] As a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, the filter box is provided with a support frame, the support frame is provided with a U-shaped limiting frame, and the support frame is provided with a collection basket that is fitted and connected to both the limiting frame and the filter box, and the collection basket is located on the left side of the filter plate.

[0009] As a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, wherein: a horizontal bar with its right end inserted into a collection basket is transversely inserted through the support frame, a rack is provided on the horizontal bar, and a spring is provided on the rack and connected to the support frame, a gear is meshed with the rear side of the rack, the gear is rotatably mounted on the support frame, a rack is meshed with the top of the gear, the rack is slidably connected to the support frame, and the rack is transversely inserted through the support rod.

[0010] As a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, a vertical rod extends through the filter box, a scraper is provided at the bottom of the vertical rod and is attached to the left side of the top plate, a wheel seat is provided at the top of the vertical rod and a roller is provided on the wheel seat, and a spring connected to the filter box is provided at the bottom of the wheel seat.

[0011] In a preferred embodiment of the online calibration device for a gas float flowmeter described in this invention, the bottom plate, filter plate, and top plate are aligned on their left sides.

[0012] In a preferred embodiment of the online calibration device for a gas float flowmeter described in this invention, a cam is attached to the top of the roller, the cam rotates coaxially with the second gear, and both the cam and the second gear are rotatably mounted on the filter box.

[0013] In a preferred embodiment of the online calibration device for a gas float flowmeter according to the present invention, the top of the gear two is meshed with a rack three connected to the connecting plate.

[0014] A calibration method for an online calibration device for a gas float flowmeter specifically includes the following steps: Step 1: First, place one side of the gas float flowmeter to be calibrated against the support block. Then, reduce the distance between the two movable blocks to fix the gas float flowmeter. After the gas float flowmeter is fixed to the connecting plate, rotate the screw to move the connecting plate closer to the vertical plate. When the gas float flowmeter's inlet calibration port contacts the rubber ring, the air pump will work to allow external gas to enter the filter box through the through hole. Under the filtration of the filter plate, the dust in the external gas is filtered out. Then, the clean gas enters the inner cavity of the conical rubber sleeve through the inlet pipe and the delivery pipe, causing the conical rubber sleeve to inflate and expand. Since the inner ring of the conical rubber sleeve is fitted on the fixed pipe, the outer ring of the conical rubber sleeve can expand and lock into the inlet calibration port of the gas float flowmeter. Step 2: Next, use the gas source interface to connect to the high-pressure compressed air cylinder as the gas source, the pressure reducing valve controls the gas pressure, the temperature transmitter and pressure transmitter record the temperature and pressure values ​​of the test gas source, and the float flow meter and Coriolis mass flow meter work together to complete the calibration of the float flow meter of the gas to be calibrated. Step 3: After calibration, open the valve to expel the air from the inner cavity, which will cause the conical rubber sleeve to contract. Then move the calibrated gas float flow meter to the right to reduce friction between the gas float flow meter's inlet and the conical rubber sleeve. When the calibrated gas float flow meter is moved to the right, the connecting plate drives rack three to move to the right, causing gear two to rotate. This, in turn, drives the scraper through the cam to remove the dust covering the left side of the filter plate. The removed dust falls into the collection basket. Step 4: When it is time to clean the collection basket and filter plate, pull the crossbar to the left, so that rack one compresses spring one, and the collection basket can be removed. After removing the collection basket, release the crossbar. Spring one drives rack one and crossbar to move to the right, so that gear one rotates counterclockwise, driving rack two to move to the left, which will simultaneously release the fixation of the support rod. Then the support rod can be removed upwards, and the filter plate can be taken out at the same time.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. When the air inlet of the gas float flowmeter to be calibrated comes into contact with the rubber ring, the air pump operates, allowing external gas to enter the inner cavity of the conical rubber sleeve through the air inlet pipe and the air delivery pipe, causing the conical rubber sleeve to inflate and expand. Since the inner ring of the conical rubber sleeve is fitted onto the fixed pipe, the outer ring of the conical rubber sleeve can expand and lock into the air inlet of the gas float flowmeter to be calibrated. After calibration, the valve is opened to expel the air in the inner cavity, causing the conical rubber sleeve to contract. At this point, the gas float flowmeter after calibration is moved to the right, so that there is no large friction between the air inlet of the gas float flowmeter and the conical rubber sleeve after calibration. This avoids the large friction when removing the gas float flowmeter, which affects the stability of the conical rubber sleeve installation, and also avoids excessive wear of the conical rubber sleeve after long-term and repeated use. 2. By setting up a filter assembly, dust particles in the outside gas can be prevented from entering the inner cavity of the conical rubber sleeve, thus avoiding affecting the airtightness when the conical rubber sleeve is connected to the air inlet calibration port of the gas float flowmeter to be calibrated; when the connecting plate moves the gas float flowmeter to the right for disassembly, rack three can synchronously drive gear two to rotate, so that the scraper moves back and forth vertically to scrape off the dust covering the left side of the filter plate. After pulling the crossbar to the left to remove the collection basket, the crossbar can be released to allow rack two to disengage from the support rod, so that the filter plate can be removed at the same time, and the collection basket and filter plate can be cleaned at the same time. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the online calibration device and calibration method for a gas float flowmeter according to the present invention; Figure 2 This is a schematic diagram of the fixed component, the air-filling component, and the filter component of the online calibration device and calibration method for a gas float flowmeter according to the present invention. Figure 3 This is a partial cross-sectional schematic diagram of the online calibration device and calibration method for a gas float flowmeter according to the present invention; Figure 4 This is a schematic diagram of the fixed tube, rubber ring, conical rubber sleeve, and inner cavity structure described in the online calibration device and calibration method for a gas float flowmeter of the present invention. Figure 5This is a schematic diagram of the internal structure of the filter box described in the online calibration device and calibration method for a gas float flowmeter of the present invention; Figure 6 This is a rear view schematic diagram of the structure of the collection basket, rack one, gear one and rack two described in the online calibration device and calibration method for a gas float flowmeter of the present invention.

[0017] In the diagram: 1. Fixing frame; 2. Connecting pipe; 3. Gas source interface; 4. Pressure reducing valve; 5. Temperature transmitter; 6. Pressure transmitter; 7. Float flow meter; 8. Coriolis mass flow meter; 9. Vertical plate; 10. Connecting frame; 11. Screw; 12. Connecting plate; 13. Guide rod; 14. Support block; 15. Electric telescopic rod; 16. Movable block; 17. Fixing pipe; 18. Rubber ring; 19. Conical rubber sleeve; 20. Inner cavity; 21. Exhaust pipe; 22. Valve; 23. Gas supply. 24. Pipe; 25. Air pump; 26. Inlet pipe; 27. Fixing rod; 28. Filter box; 29. ​​Through hole; 30. Base plate; 31. Filter plate; 32. Top plate; 33. Support rod; 34. Collection basket; 35. Support frame; 36. Limiting frame; 37. Horizontal bar; 38. Rack 1; 39. Spring 1; 40. Gear 1; 41. Rack 2; 42. Vertical rod; 43. Scraper; 44. Spring 2; 45. Wheel seat; 46. Roller; 47. Cam; 48. Gear 2; 49. Rack 3. Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] As mentioned in the background section, existing technologies often suffer from loosening and excessive wear of the conical rubber sleeve during disassembly. This invention proposes an online calibration device and method for a gas float flowmeter that reduces friction during disassembly. Example

[0020] Reference Figures 1 to 6 An online calibration device for a gas float flowmeter includes a fixed frame 1 and a connecting pipe 2. The connecting pipe 2 is provided with a gas source interface 3, which is used to connect a compressed gas source during testing to assist in the calibration process of the gas float flowmeter. A pressure reducing valve 4, a temperature transmitter 5, a pressure transmitter 6, a float flowmeter 7, and a Coriolis mass flowmeter 8 are sequentially connected to the connecting pipe 2. The pressure reducing valve 4, the temperature transmitter 5, the pressure transmitter 6, the float flowmeter 7, and the Coriolis mass flowmeter 8 are all mounted on the fixed frame 1. All of the above are existing technologies. The mounting bracket 1 is equipped with a fixing component; The fixing assembly includes a vertical plate 9, on which a connecting frame 10 is mounted. A screw 11 extends horizontally through the connecting frame 10, and a connecting plate 12 is rotatably connected to the left end of the screw 11. A guide rod 13 extends through the connecting frame 10 on the connecting plate 12, guiding the connecting plate 12. A support block 14 and two sets of identical electric telescopic rods 15 are mounted on the connecting plate 12, with movable blocks 16 at the output ends of each electric telescopic rod 15. The electric telescopic rods 15 drive the movable blocks 16 to move vertically. The vertical plate 9 is laterally mounted with a fixing mechanism connected to the connecting pipe 2. A rubber ring 18 is provided on the right side of the fixed tube 17 and the vertical plate 9, and a conical rubber sleeve 19 is provided on the right side of the rubber ring 18. Both the rubber ring 18 and the conical rubber sleeve 19 are fitted over the outside of the fixed tube 17, so that when the conical rubber sleeve 19 expands, its outer ring can expand and lock into the air inlet calibration port of the gas float flowmeter to be calibrated. An inner cavity 20 is provided inside the conical rubber sleeve 19. An exhaust pipe 21 and an air supply pipe 23 are provided on the conical rubber sleeve 19. A valve 22 is provided on the exhaust pipe 21. The air supply pipe 23 is connected to the air filling component. A filter component is connected to the air filling component.

[0021] The inflation assembly includes an air pump 24 mounted on a vertical plate 9. The air pump 24 is connected to an air supply pipe 23. An air inlet pipe 25 is mounted on the air pump 24. The valve 22, the air pump 24, and the electric telescopic rod 15 are all powered and controlled by existing technology.

[0022] The filter assembly includes a fixing rod 26 mounted on a vertical plate 9. A filter box 27 connected to an air inlet pipe 25 is mounted on the fixing rod 26. A through hole 28 is provided on the left side of the filter box 27 for external gas to enter. A bottom plate 29 is provided on the bottom inner wall of the filter box 27. A filter plate 30 is attached to the top of the bottom plate 29. A top plate 31 is provided on the top of the filter plate 30, and a support rod 32 penetrating the top of the filter box 27 is provided on the top of the top plate 31. The filter plate 30 is used to filter external gas. If gas containing dust particles enters the inner cavity 20, it will cause the conical rubber sleeve 19 to expand and cause surface bulges, affecting the airtightness of the conical rubber sleeve 19 when connected to the air inlet calibration port of the gas float flowmeter to be calibrated.

[0023] A support frame 34 is provided on the filter box 27. A U-shaped limiting frame 35 is provided on the support frame 34. A collection basket 33 is provided on the support frame 34 and is in close contact with both the limiting frame 35 and the filter box 27. The collection basket 33 is located on the left side of the filter plate 30. The limiting frame 35 is used to position the collection basket 33, and the support frame 34 is used to support the collection basket 33.

[0024] A horizontal bar 36, with its right end inserted into the collection basket 33, runs horizontally through the support frame 34. A rack 37 is mounted on the rack 36, and a spring 38 connected to the support frame 34 is mounted on the rack 37. A gear 39 is meshed with the rear side of the rack 37 and is rotatably mounted on the support frame 34. A second rack 40 is meshed with the top of the gear 39. To guide the second rack 40 and allow it to slide against the support frame 34, the second rack 40 also runs horizontally through the support rod 32, thus limiting the movement of the support rod 32. By pulling the crossbar 36 to the left, the rack 37 moves synchronously, compressing the spring 38, and the collection basket 33 can be removed. After removal, the crossbar 36 is released. Under the action of the spring 38, since the collection basket 33 is no longer obstructing, the crossbar 36 and the rack 37 move a longer distance to the right. Under the action of the gear 39, the rack 40 moves to the left and disengages from the support rod 32, so that the filter plate 30 can be removed at the same time. The collection basket 33 and the filter plate 30 can be cleaned at the same time. After cleaning, the support rod 32, the top plate 31 and the filter plate 30 are placed first, and then the collection basket 33 is placed.

[0025] A vertical rod 41 runs through the filter box 27. A scraper 42 is attached to the left side of the top plate 31 at the bottom of the vertical rod 41. A wheel seat 44 is provided at the top of the vertical rod 41, and a roller 45 is provided on the wheel seat 44. A spring 43 connected to the filter box 27 is provided at the bottom of the wheel seat 44, and the spring 43 allows the wheel seat 44 to return to its original position.

[0026] The left sides of the bottom plate 29, filter plate 30 and top plate 31 are aligned so that the scraper 42 can move on the top plate 31, bottom plate 29 and filter plate 30 to scrape off the dust covering the left side of the filter plate 30 and improve the ventilation effect of the filter plate 30 during use.

[0027] A cam 46 is attached to the top of the roller 45. The cam 46 rotates coaxially with the gear 47. Both the cam 46 and the gear 47 are rotatably mounted on the filter box 27, so that the cam 46 and the gear 47 can rotate synchronously when they rotate, thereby driving the roller 45 to move vertically back and forth. Example

[0028] Reference Figures 1 to 3 A rack 48 connected to the connecting plate 12 is meshed at the top of the gear 2 47, so that when the connecting plate 12 moves laterally, it can drive the rack 48 to move on the gear 2 47, causing the gear 2 47 to rotate.

[0029] The rest of the structure is the same as in Example 1.

[0030] A calibration method for an online calibration device for a gas float flowmeter, using the online calibration device for a gas float flowmeter as described in Example 2, specifically includes the following steps: Step 1: First, place one side of the gas float flowmeter to be calibrated against the support block 14, and then reduce the distance between the two movable blocks 16 to fix the gas float flowmeter to be calibrated. After the gas float flowmeter to be calibrated is fixed to the connecting plate 12, rotate the screw 11 so that the connecting plate 12 moves the gas float flowmeter to be calibrated closer to the vertical plate 9. When the air inlet calibration port of the gas float flowmeter to be calibrated comes into contact with the rubber ring 18, the air pump 24 works to allow the outside gas to enter the filter box 27 through the through hole 28. Under the filtration of the filter plate 30, the dust in the outside gas is filtered out. Then the clean gas enters the inner cavity 20 of the conical rubber sleeve 19 through the air inlet pipe 25 and the air delivery pipe 23, causing the conical rubber sleeve 19 to inflate and expand. Since the inner ring of the conical rubber sleeve 19 is fitted on the fixed pipe 17, the outer ring of the conical rubber sleeve 19 can expand and be locked in the air inlet calibration port of the gas float flowmeter to be calibrated. Step 2: Next, use the gas source interface 3 to connect to the high-pressure compressed air cylinder as the gas source, the pressure reducing valve 4 controls the air pressure, the temperature transmitter 5 and the pressure transmitter 6 record the temperature and pressure values ​​of the test gas source, and the float flow meter 7 and the Coriolis mass flow meter 8 work together to complete the calibration of the float flow meter of the gas to be calibrated. The specific calibration process is the existing technology, and its detailed principle will not be described here. Step 3: After calibration, open valve 22 to expel the air from the inner cavity 20, which will cause the conical rubber sleeve 19 to contract. Then move the gas float flow meter to the right after calibration to reduce friction between the gas float flow meter's inlet and the conical rubber sleeve 19. When the gas float flow meter is moved to the right, the connecting plate 12 drives the rack 3 48 to move to the right, causing the gear 2 47 to rotate. This, in turn, drives the scraper 42 through the cam 46 to scrape off the dust covering the left side of the filter plate 30. The scraped dust falls into the collection basket 33. Step 4: When it is necessary to clean the collection basket 33 and the filter plate 30, pull the crossbar 36 to the left, so that the rack 37 compresses the spring 38, and the collection basket 33 can be removed. After removing the collection basket 33, release the crossbar 36. The spring 38 drives the rack 37 and the crossbar 36 to move to the right, so that the gear 39 rotates counterclockwise, driving the rack 40 to move to the left. At the same time, the fixation of the support rod 32 can be released. Then the support rod 32 can be removed upwards, and the filter plate 30 can be taken out at the same time.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An online calibration device for a gas float flowmeter, characterized in that: It includes a fixed frame (1) and a connecting pipe (2). The connecting pipe (2) is provided with a gas source interface (3). A pressure reducing valve (4), a temperature transmitter (5), a pressure transmitter (6), a float flow meter (7), and a Coriolis mass flow meter (8) are connected in sequence on the connecting pipe (2). The pressure reducing valve (4), the temperature transmitter (5), the pressure transmitter (6), the float flow meter (7), and the Coriolis mass flow meter (8) are all set on the fixed frame (1). The fixing frame (1) is provided with fixing components; The fixing component includes a vertical plate (9), and a connecting frame (10) is provided on the vertical plate (9). A screw (11) is horizontally passed through the connecting frame (10). The left end of the screw (11) is rotatably connected to a connecting plate (12), and a guide rod (13) is provided on the connecting plate (12) that passes through the connecting frame (10). A support block (14) and two sets of electric telescopic rods (15) with the same structure are provided on the connecting plate (12). The output end of each electric telescopic rod (15) is provided with a movable block (16). The vertical plate (9) is horizontally connected to the connecting pipe (2). The fixed tube (17) is connected to the vertical plate (9). A rubber ring (18) is provided on the right side of the vertical plate (9), and a conical rubber sleeve (19) is provided on the right side of the rubber ring (18). The rubber ring (18) and the conical rubber sleeve (19) are both fitted on the outside of the fixed tube (17). An inner cavity (20) is provided inside the conical rubber sleeve (19). An exhaust pipe (21) and an air supply pipe (23) are provided on the conical rubber sleeve (19). A valve (22) is provided on the exhaust pipe (21). The air supply pipe (23) is connected to the air inflation assembly. A filter assembly is connected to the air inflation assembly.

2. The online calibration device for a gas float flowmeter according to claim 1, characterized in that: The inflation assembly includes an air pump (24) mounted on a vertical plate (9), the air pump (24) being connected to an air delivery pipe (23), and an air inlet pipe (25) mounted on the air pump (24).

3. The online calibration device for a gas float flowmeter according to claim 2, characterized in that: The filter assembly includes a fixing rod (26) set on a vertical plate (9), a filter box (27) connected to an air inlet pipe (25) is set on the fixing rod (26), a through hole (28) is set on the left side of the filter box (27), a bottom plate (29) is set on the bottom inner wall of the filter box (27), a filter plate (30) is attached to the top of the bottom plate (29), a top plate (31) is set on the top of the filter plate (30), and a support rod (32) penetrating the top of the filter box (27) is set on the top of the top plate (31).

4. The online calibration device for a gas float flowmeter according to claim 3, characterized in that: The filter box (27) is provided with a support frame (34), the support frame (34) is provided with a U-shaped limiting frame (35), the support frame (34) is provided with a collection basket (33) that is in close contact with both the limiting frame (35) and the filter box (27), and the collection basket (33) is located on the left side of the filter plate (30).

5. The online calibration device for a gas float flowmeter according to claim 4, characterized in that: A horizontal bar (36) with its right end inserted into the collection basket (33) runs horizontally through the support frame (34). A rack (37) is provided on the horizontal bar (36), and a spring (38) connected to the support frame (34) is provided on the rack (37). A gear (39) is meshed with the rear side of the rack (37). The gear (39) is rotatably mounted on the support frame (34). A rack (40) is meshed with the top of the gear (39). The rack (40) is slidably connected to the support frame (34), and the rack (40) runs horizontally through the support rod (32).

6. The online calibration device for a gas float flowmeter according to claim 4, characterized in that: A vertical rod (41) runs vertically through the filter box (27). A scraper (42) is attached to the left side of the top plate (31) at the bottom of the vertical rod (41). A wheel seat (44) is provided at the top of the vertical rod (41), and a roller (45) is provided on the wheel seat (44). A spring (43) connected to the filter box (27) is provided at the bottom of the wheel seat (44).

7. The online calibration device for a gas float flowmeter according to claim 6, characterized in that: The bottom plate (29), filter plate (30) and top plate (31) are aligned on the left side.

8. The online calibration device for a gas float flowmeter according to claim 6, characterized in that: The top of the roller (45) is fitted with a cam (46), which rotates coaxially with the gear (47), and both the cam (46) and the gear (47) are rotatably mounted on the filter box (27).

9. The online calibration device for a gas float flowmeter according to claim 8, characterized in that: The top of the gear two (47) is engaged with a rack three (48) connected to the connecting plate (12).

10. A calibration method for an online calibration device for a gas float flowmeter according to any one of claims 1-9, characterized in that: The method includes the following steps: Step 1: First, place one side of the gas float flowmeter to be calibrated against the support block (14), then reduce the distance between the two movable blocks (16) to fix the gas float flowmeter to be calibrated. After the gas float flowmeter to be calibrated is fixed to the connecting plate (12), rotate the screw (11) so that the connecting plate (12) moves the gas float flowmeter to be calibrated closer to the vertical plate (9). When the air inlet calibration port of the gas float flowmeter to be calibrated contacts the rubber ring (18), the air pump (24) works to make the gas float flowmeter to be calibrated move closer to the vertical plate (9). External gas enters the filter box (27) through the through hole (28). Under the filtration of the filter plate (30), the dust in the external gas is filtered out. Then, the clean gas enters the inner cavity (20) of the conical rubber sleeve (19) through the inlet pipe (25) and the delivery pipe (23), causing the conical rubber sleeve (19) to inflate. Since the inner ring of the conical rubber sleeve (19) is fitted on the fixed pipe (17), the outer ring of the conical rubber sleeve (19) can expand and be locked in the inlet calibration port of the gas float flowmeter to be calibrated. Step 2: Next, use the gas source interface (3) to connect the high-pressure compressed air cylinder as the gas source, the pressure reducing valve (4) to control the air pressure, the temperature transmitter (5) and the pressure transmitter (6) to record the temperature and pressure values ​​of the test gas source, and the float flow meter (7) and the Coriolis mass flow meter (8) work together to complete the calibration of the float flow meter of the gas to be calibrated. Step 3: After calibration, open valve (22) to allow the air in the inner cavity (20) to be discharged, which will cause the conical rubber sleeve (19) to contract. Then move the gas float flow meter after calibration to the right so that the gas inlet calibration port of the gas float flow meter after calibration does not generate much friction with the conical rubber sleeve (19). When the gas float flow meter after calibration is moved to the right, the connecting plate (12) drives the rack three (48) to move to the right, which causes the gear two (47) to rotate. Then, the cam (46) drives the scraper (42) to scrape off the dust covering the left side of the filter plate (30). The scraped dust falls into the collection basket (33). Step 4: When it is necessary to clean the collection basket (33) and filter plate (30), pull the crossbar (36) to the left so that the rack (37) compresses the spring (38) and the collection basket (33) can be taken out. After taking out the collection basket (33), release the crossbar (36). The spring (38) drives the rack (37) and the crossbar (36) to move to the right, so that the gear (39) rotates counterclockwise and drives the rack (40) to move to the left. At the same time, the fixation of the support rod (32) can be released. Then the support rod (32) can be taken out upwards, and the filter plate (30) can be taken out at the same time.

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