Calibration device of circular gear flowmeter

Abstract

The utility model relates to the field of flowmeter calibration devices, and discloses a calibration device of a circular gear flowmeter, which comprises a base, the left end of the base is fixedly connected with a vertical plate, the top end of the vertical plate is fixedly connected with a magnetic plate, the middle right part of the magnetic plate is provided with a through hole, and the top end of the magnetic plate is provided with a flowmeter assembly. The flowmeter assembly is a circular gear flowmeter to be tested, a measuring body is fixedly connected to the right portion of the top end of the base, a liquid inlet is formed in the middle of the top end of the measuring body, and a threaded groove is formed in the position, on the outer side of the liquid inlet, of the top end of the measuring body. The connecting assembly can quickly fix the flowmeter assembly and the measuring body, the two clamping assemblies clamp the bottom end of the flowmeter assembly, the sealing degree between the connecting assembly and the flowmeter assembly can be further improved, fluid is prevented from seeping out of the connecting position to affect the detection result, and correct calibration of the flowmeter assembly is facilitated.

Description

Technical Field

[0001] The utility model relates to the field of flowmeter calibration devices, in particular to a calibration device for a circular gear flowmeter. Background Art

[0002] With the continuous advancement of industrial technology, the requirements for flow measurement accuracy are getting higher and higher. In the chemical, petroleum, pharmaceutical, food and other industries, accurate flow measurement is crucial for production process control, quality inspection and cost accounting. As a high-precision flow measurement device, the measurement accuracy of the circular gear flowmeter directly affects the stability of the production process and product quality. Therefore, it is necessary to use a reliable calibration device to calibrate the circular gear flowmeter regularly to ensure that its measurement accuracy meets the needs of industrial production. Among them, the weighing method calibration device is one of them.

[0003] Its working principle is to install the circular gear flowmeter to be tested above a container of known volume, so that the liquid flows into the container through the circular gear flowmeter. Within a certain period of time, by weighing the weight of the liquid in the container and combining it with the density of the liquid, the volume of the liquid flowing through the circular gear flowmeter can be calculated. By comparing this volume with the indication of the circular gear flowmeter, the measurement error of the flowmeter can be determined.

[0004] However, when fixing the circular gear flowmeter to the calibration device, tools such as wrenches, screwdrivers, and sealing gaskets are often required, and the installation process is relatively cumbersome. In addition, this method needs to ensure that volatilization and leakage of the liquid are avoided during operation. Once volatilization or leakage occurs, it will cause errors in the measurement results, thereby affecting the accuracy of the calibration. Utility Model Content

[0005] In order to make up for the above shortcomings, the utility model provides a calibration device for a circular gear flowmeter, aiming to improve the problem in the prior art that the fixing method of the circular gear flowmeter and the calibration device is relatively cumbersome, and the liquid is easy to leak at the connection point, resulting in errors in the measurement results.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A calibration device for a circular gear flowmeter, comprising a base, a vertical plate fixedly connected to the left end of the base, a magnetic plate fixedly connected to the top of the vertical plate, a through hole formed in the middle right portion of the magnetic plate, and a flowmeter assembly disposed on the top of the magnetic plate;

[0008] The flowmeter assembly is a circular gear flowmeter to be tested, a measuring body is fixedly connected to the right portion of the top of the base, a liquid inlet is opened in the middle portion of the top of the measuring body, a threaded groove is opened on the outside of the liquid inlet at the top of the measuring body, and a connecting assembly is provided at the top of the measuring body, which is used to connect the flowmeter assembly and the measuring body;

[0009] The bottom of the magnetic plate is fixedly connected to a support plate at the front and rear ends of the left end of the through hole, the front bottom of the front support plate is fixedly connected to a driver, the output end of the driver is fixedly connected to a bidirectional screw rod, the rear end of the bidirectional screw rod is rotatably connected to the rear support plate, and the outer side of the bidirectional screw rod is threadedly connected to the front and rear ends of the slider;

[0010] The right end of the slider is fixedly connected to a first fixed block, the right part of the opposite end of the first fixed block is provided with an arc plate, and the opposite end of the first fixed block is snap-connected with a clamping assembly, and the two clamping assemblies can prevent fluid leakage.

[0011] The flowmeter assembly includes a circular gear flowmeter body, the bottom end of the circular gear flowmeter body is fitted with the top end of the magnetic plate, and the front end of the circular gear flowmeter body is fixedly connected to a display; the input end of the circular gear flowmeter body is fixedly connected to a liquid inlet pipe, and the output end of the circular gear flowmeter body is fixedly connected to a liquid outlet pipe, and a number of annular blocks are fixedly connected to the outer side of the middle and lower parts of the liquid outlet pipe at equal distances.

[0012] The liquid outlet pipe is located in the middle of the through hole and passes through the through hole.

[0013] The connecting assembly includes a connecting tube, the bottom of which fits with the top of the measuring body, the bottom end of the connecting tube is fixedly connected to an external threaded block, a limiting groove is provided in the upper and middle part of the outer side of the connecting tube, a connecting groove is provided at the top of the connecting tube, and a sealing ring is fixedly connected to the outer side of the bottom end of the connecting groove.

[0014] The outer side of the bottom end of the liquid outlet pipe is fitted with the connecting groove, the bottom end of the liquid outlet pipe is fitted with the sealing ring, and the external thread block is threadedly connected to the thread groove.

[0015] The two clamping assemblies are symmetrical, and the front clamping assembly includes a second fixing block, the left side of the second fixing block is in contact with the left side of the arc-shaped plate, and a knob is provided at a distance from the right end of the second fixing block, and the left end of the knob is fixedly connected to a bidirectional threaded column;

[0016] The bidirectional threaded column is rotatably connected to the left end of the interior of the second fixed block, and the outer side of the bidirectional threaded column is threadedly connected to movable plates at both left and right ends of the interior of the second fixed block. The upper and lower sides of the opposite ends of the two movable plates are rotatably connected to movable arms, and movable plates are provided at both upper and lower ends of the interior of the second fixed block;

[0017] The ends of the movable plates that are away from each other are fixedly connected with a clamping block, the ends of the upper and lower movable arms that are away from each other are rotatably connected to the movable plate on the same side, the rear end of the second fixed block is fixedly connected with a connecting block, the rear end of the connecting block is fixedly connected with a semi-annular plate, a number of arc-shaped grooves are opened at equal distances on the inner side of the semi-annular plate, and the outer side of the bottom end of the semi-annular plate is fixedly connected with an arc plate.

[0018] The clamping block is slidably connected to the second fixed block. The first fixed block is provided with clamping slots at corresponding positions of the clamping block. The clamping block is clamped and connected with the corresponding clamping slots.

[0019] When the opposite side of the semi-annular plate is fitted, the arc-shaped groove is engaged and connected with the corresponding annular block, and the inner side of the arc-shaped plate is fitted with the limiting groove.

[0020] The utility model has the following beneficial effects:

[0021] 1. The utility model takes out the connecting tube that matches the liquid outlet pipe on the circular gear flowmeter body to be tested, and then screws the external thread block at the bottom end of the connecting tube into the thread groove. Then, the liquid outlet pipe is passed through the through hole and the bottom end of the liquid outlet pipe is fitted with the bottom end of the connecting groove and the top end of the sealing ring. At this time, the bottom end of the liquid outlet pipe is engaged with the connecting groove, so that the liquid outlet pipe and the connecting tube are quickly connected, thereby making the connection between the circular gear flowmeter body and the liquid inlet pipe faster.

[0022] By rotating the measuring body, the two movable plates are moved away from the center of the movable plate, and the movable arm drives the movable plate to move toward the center of the second fixed block until the away side of the clamping block is respectively located on the same horizontal line with the upper and lower sides of the second fixed block. The second fixed block can be disassembled. With the easy disassembly of the connecting pipe, the appropriate connecting pipe and semi-annular plate can be replaced according to the radius of the liquid outlet pipe on the circular gear flowmeter body to adapt to the calibration of different circular gear flowmeter bodies.

[0023] 2. The utility model starts the driver to rotate the bidirectional screw, driving the two sliders to move toward the center of the liquid outlet pipe until the opposite sides of the two semi-annular plates are in contact. At this time, the semi-annular plates clamp the liquid outlet pipe, the arc grooves are engaged with the corresponding annular blocks, and the inner sides of the arc plates are in contact with the limit grooves, preventing the liquid outlet pipe from being displaced during fluid flow, thereby avoiding fluid leakage from the connection between the liquid outlet pipe and the limit groove, causing the volume of the fluid flowing through the inside of the circular gear flowmeter body to be inconsistent with the volume of the fluid inside the measuring body, thereby causing errors in the test results and affecting the calibration of the circular gear flowmeter body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the calibration device of the circular gear flowmeter of the utility model;

[0025] Figure 2 This is a front cross-sectional view of the circular gear flowmeter body of the circular gear flowmeter calibration device of the utility model;

[0026] Figure 3 This is a left bottom view of the left side section of the magnetic plate of the calibration device of the circular gear flowmeter of the present invention;

[0027] Figure 4 This is a front cross-sectional view of the first fixing block and the second fixing block on the front side of the calibration device of the circular gear flowmeter of the present invention;

[0028] Figure 5 This is a front cross-sectional view of the measuring body of the calibration device of the circular gear flowmeter of the present invention;

[0029] Figure 6 This is a top view of the connecting pipe of the calibration device of the circular gear flowmeter of the present invention.

[0030] Legend:

[0031] 1. Base; 2. Vertical plate; 3. Magnetic plate; 4. Circular gear flowmeter body; 5. Display; 6. Liquid inlet pipe; 7. Liquid outlet pipe; 8. Ring block; 9. Measuring body; 10. Liquid inlet; 11. Threaded groove; 12. Connecting pipe; 13. External thread block; 14. Limiting groove; 15. Connecting groove; 16. Sealing ring; 17. Through hole; 18. Support plate; 19. Driver; 20. Bidirectional screw rod; 21. Slider; 22. First fixed block; 23. Connecting block; 24. Second fixed block; 25. Semi-ring plate; 26. Arc groove; 27. Arc plate; 28. Knob; 29. ​​Bidirectional threaded column; 30. Moving plate; 31. Movable plate; 32. Block; 33. Movable arm; 34. Slot. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0033] Reference Figure 1 、 Figure 3 and Figure 5 A calibration device for a circular gear flowmeter includes a base 1, a vertical plate 2 is fixedly connected to the left end of the base 1, a magnetic plate 3 is fixedly connected to the top of the vertical plate 2, a through hole 17 is opened in the middle right part of the magnetic plate 3, and a flowmeter component is provided on the top of the magnetic plate 3;

[0034] The flowmeter assembly is a circular gear flowmeter to be tested. A measuring body 9 is fixedly connected to the top right portion of the base 1. A liquid inlet 10 is provided in the middle of the top of the measuring body 9. A threaded groove 11 is provided on the top of the measuring body 9 on the outside of the liquid inlet 10. A connecting assembly is provided on the top of the measuring body 9.

[0035] The connecting assembly is used to connect the flow meter assembly and the measuring body 9. The bottom of the magnetic plate 3 is fixedly connected to the support plate 18 at the front and rear ends of the left end of the through hole 17. The front bottom of the front support plate 18 is fixedly connected to the driver 19. The output end of the driver 19 is fixedly connected to the bidirectional screw rod 20. The rear end of the bidirectional screw rod 20 is rotatably connected to the rear support plate 18. The outer side of the bidirectional screw rod 20 is threadedly connected to the front and rear ends of the slider 21.

[0036] The right end of the slider 21 is fixedly connected to the first fixed block 22, and the right part of the opposite end of the first fixed block 22 is provided with an arc plate 27. The opposite end of the first fixed block 22 is snap-connected with a clamping assembly, and the two clamping assemblies can prevent fluid leakage.

[0037] A pressure sensor is provided inside the bottom end of the measuring body 9, which can detect the weight of the fluid inside the measuring body 9. The flow meter assembly can be quickly connected to the measuring body 9 through the connecting assembly. By starting the driver 19 to drive the bidirectional screw 20 to rotate, the two sliders 21 are moved toward the center of the liquid outlet pipe 7, driving the two clamping assemblies to clamp the bottom end of the flow meter assembly, which can further improve the sealing between the connecting assembly and the flow meter assembly, prevent the fluid from leaking from the connection to affect the detection results, thereby affecting the accuracy of the flow meter assembly.

[0038] Reference Figure 1 and Figure 2 The flow meter assembly includes a circular gear flow meter body 4, the bottom end of the circular gear flow meter body 4 is fitted with the top end of the magnetic plate 3, and the front end of the circular gear flow meter body 4 is fixedly connected to a display 5;

[0039] The input end of the circular gear flowmeter body 4 is fixedly connected to the liquid inlet pipe 6, and the output end of the circular gear flowmeter body 4 is fixedly connected to the liquid outlet pipe 7. Several annular blocks 8 are fixedly connected to the outer side of the middle and lower part of the liquid outlet pipe 7 at equal distances. The liquid outlet pipe 7 is located in the middle of the through hole 17 and passes through the through hole 17.

[0040] The magnetic plate 3 adsorbs the circular gear flowmeter body 4 on the magnetic plate 3, the liquid outlet pipe 7 passes through the through hole 17, the fluid enters the circular gear flowmeter body 4 from the liquid inlet pipe 6, and then flows out from the liquid outlet pipe 7. The display 5 can display the volume of liquid flowing through the circular gear flowmeter body 4.

[0041] Reference Figure 2 、 Figure 5 and Figure 6The connecting assembly includes a connecting tube 12, the bottom of the connecting tube 12 is fitted with the top of the measuring body 9, the bottom end of the connecting tube 12 is fixedly connected to an external thread block 13, a limiting groove 14 is provided on the upper and middle part of the outer side of the connecting tube 12, a connecting groove 15 is provided at the top of the connecting tube 12, a sealing ring 16 is fixedly connected to the outer side of the bottom end of the connecting groove 15, the outer side of the bottom end of the liquid outlet pipe 7 is fitted with the connecting groove 15, the bottom end of the liquid outlet pipe 7 is fitted with the sealing ring 16, and the external thread block 13 is threadedly connected to the thread groove 11.

[0042] By threading the external thread block 13 on the connecting pipe 12 into the thread groove 11, the connecting pipe 12 can be quickly fixed. Since the bottom of the liquid outlet pipe 7 fits with the bottom of the connecting groove 15, the bottom end of the liquid outlet pipe 7 is engaged with the connecting groove 15, and the bottom of the liquid outlet pipe 7 fits with the top of the sealing ring 16, the sealing effect of the connecting pipe 12 and the liquid outlet pipe 7 can be improved.

[0043] Reference Figure 2 、 Figure 3 、 Figure 4 and Figure 5 The two clamping assemblies are symmetrical. The front clamping assembly includes a second fixed block 24. The left side of the second fixed block 24 is in contact with the left side of the arc-shaped plate 27. A knob 28 is provided at a distance from the right end of the second fixed block 24. The left end of the knob 28 is fixedly connected to a two-way threaded column 29. The two-way threaded column 29 is rotatably connected to the inner left end of the second fixed block 24. The outer side of the two-way threaded column 29 is threadedly connected to the movable plate 30 at both the left and right ends of the inner side of the second fixed block 24.

[0044] The upper and lower sides of the opposite end of the movable plate 30 are rotatably connected to movable arms 33. The upper and lower ends of the second fixed block 24 are provided with movable plates 31. The ends away from each other of the two movable plates 31 are fixedly connected to the clamping blocks 32. The ends away from each other of the upper and lower movable arms 33 are rotatably connected to the movable plate 31 on the same side. The rear end of the second fixed block 24 is fixedly connected to the connecting block 23, and the rear end of the connecting block 23 is fixedly connected to the semi-annular plate 25.

[0045] A number of arc-shaped grooves 26 are provided at equal distances on the inner side of the semi-annular plate 25. An arc-shaped plate 27 is fixedly connected to the outer side of the bottom end of the semi-annular plate 25. The clamping block 32 is slidably connected to the second fixed block 24. The first fixed block 22 is provided with a clamping groove 34 at the corresponding position of the clamping block 32. The clamping block 32 is engaged with the corresponding clamping groove 34. When the opposite side of the semi-annular plate 25 is in contact, the arc-shaped groove 26 is engaged with the corresponding annular block 8, and the inner side of the arc-shaped plate 27 is in contact with the limit groove 14.

[0046] The rear side of the second fixed block 24 is fitted with the rear side of the arc-shaped plate 27, and the left side of the second fixed block 24 is fitted with the left side of the arc-shaped plate 27. At this time, the upper and lower sides of the second fixed block 24 are fitted with the upper and lower sides of the arc-shaped plate 27 respectively, and the left side of the support plate 18 is located at the same horizontal line as the right side of the first fixed block 22. Then, the knob 28 is turned to drive the two-way threaded column 29 to rotate, so that the two movable plates 30 move toward the center direction of the movable plate 31; at the same time, the movable arm 33 drives the movable plate 31 to move away from the center of the second fixed block 24 until the groove 34 on the same side of the clamping block 32 is engaged. When the semi-annular plates 25 are fitted together, the liquid outlet pipe 7 can be clamped, and the arc groove 26 is engaged with the corresponding annular block 8 to prevent the displacement of the liquid outlet pipe 7 caused by the flow of fluid, thereby causing the fluid to seep out;

[0047] The inner side of the arc-shaped plate 27 fits in with the limit groove 14, which can further prevent the outflow of the fluid. By rotating the knob 28 in the opposite direction, the two movable plates 30 are moved away from the center of the movable plate 31, and the movable arm 33 drives the movable plate 31 to move toward the center of the second fixed block 24 until the away side of the clamping block 32 is respectively on the same horizontal line with the upper and lower sides of the second fixed block 24, so that the second fixed block 24 can be disassembled.

[0048] Working principle: First, take out the connecting tube 12 that matches the liquid outlet pipe 7 on the circular gear flowmeter body 4 to be tested, and then thread the external thread block 13 at the bottom of the connecting tube 12 into the thread groove 11. Then, take out the semi-annular plate 25 that matches the liquid outlet pipe 7 on the circular gear flowmeter body 4 to be tested, and fit the second fixing block 24 on the semi-annular plate 25 to the left side of the adjacent arc-shaped plate 27. Then, turn the knob 28 to fit the block 32 into the corresponding slot 34. Then, place the circular gear flowmeter body 4 to be tested on top of the magnetic plate 3, and pass the liquid outlet pipe 7 through the through hole. 17 and make the bottom end of the liquid outlet pipe 7 fit with the bottom end of the connecting groove 15 and the top end of the sealing ring 16. At this time, the bottom end of the liquid outlet pipe 7 is engaged with the connecting groove 15, and then the driver 19 is started to rotate the bidirectional screw rod 20, driving the two sliders 21 to move toward the center of the liquid outlet pipe 7 until the opposite sides of the two semi-annular plates 25 fit together. At this time, the arc groove 26 is engaged with the corresponding annular block 8, and the inner side of the arc plate 27 is fitted with the limiting groove 14. The semi-annular plate 25 clamps the liquid outlet pipe 7 to prevent the liquid outlet pipe 7 from being displaced when the fluid flows, thereby preventing the fluid from leaking from the connection between the liquid outlet pipe 7 and the limiting groove 14.

[0049] Liquid is injected into the liquid inlet pipe 6, and the display 5 records the volume of liquid flowing through the circular gear flowmeter body 4. The liquid flows to the connecting pipe 12 through the liquid outlet pipe 7 and then enters the interior of the measuring body 9. The pressure sensor inside the measuring body 9 transmits the weight of the liquid in the measuring body 9 to the terminal. The volume of the liquid inside the measuring body 9 is calculated according to the density of the liquid, and then compared with the number displayed on the display 5. If it is inaccurate, the circular gear flowmeter body 4 needs to be calibrated.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A calibration device for a circular gear flowmeter, characterized in that: The invention comprises a base (1), wherein the left end of the base (1) is fixedly connected to a vertical plate (2), and the top end of the vertical plate (2) is fixedly connected to a magnetic plate (3); a through hole (17) is provided in the middle right portion of the magnetic plate (3), and a flow meter assembly is provided at the top end of the magnetic plate (3); The flow meter assembly is a circular gear flow meter to be tested, wherein a measuring body (9) is fixedly connected to the right portion of the top end of the base (1); a liquid inlet (10) is provided in the middle portion of the top end of the measuring body (9); a threaded groove (11) is provided on the outside of the liquid inlet (10) at the top end of the measuring body (9); and a connecting assembly is provided at the top end of the measuring body (9); The bottom of the magnetic plate (3) is fixedly connected to a support plate (18) at the front and rear ends of the left end of the through hole (17); the front bottom of the front support plate (18) is fixedly connected to a driver (19); the output end of the driver (19) is fixedly connected to a bidirectional screw rod (20); the rear end of the bidirectional screw rod (20) is rotatably connected to the rear support plate (18); and the outer side of the bidirectional screw rod (20) is threadedly connected to a slider (21) at the front and rear ends. The right end of the slider (21) is fixedly connected to a first fixed block (22), the right portion of the opposite end of the first fixed block (22) is provided with an arc plate (27), and the opposite end of the first fixed block (22) is snap-connected with a clamping assembly.

2. The calibration device for a circular gear flowmeter according to claim 1, characterized in that: The flow meter assembly comprises a circular gear flow meter body (4), the bottom end of the circular gear flow meter body (4) is in contact with the top end of the magnetic plate (3), and the front end of the circular gear flow meter body (4) is fixedly connected to a display (5); the input end of the circular gear flow meter body (4) is fixedly connected to a liquid inlet pipe (6), the output end of the circular gear flow meter body (4) is fixedly connected to a liquid outlet pipe (7), and a plurality of annular blocks (8) are fixedly connected to the outer side of the middle and lower part of the liquid outlet pipe (7) at equal distances.

3. The calibration device for a circular gear flowmeter according to claim 2, characterized in that: The liquid outlet pipe (7) is located in the middle of the through hole (17) and passes through the through hole (17).

4. The calibration device for a circular gear flowmeter according to claim 1, characterized in that: The connecting assembly comprises a connecting pipe (12), the bottom of the connecting pipe (12) is fitted with the top of the measuring body (9), the bottom end of the connecting pipe (12) is fixedly connected to an external thread block (13), and a limiting groove (14) is provided on the upper middle portion of the outer side of the connecting pipe (12); the top end of the connecting pipe (12) is provided with a connecting groove (15), and the outer side of the bottom end of the connecting groove (15) is fixedly connected to a sealing ring (16).

5. The calibration device for a circular gear flowmeter according to claim 4, characterized in that: The outer side of the bottom end of the liquid outlet pipe (7) is fitted with the connecting groove (15), the bottom end of the liquid outlet pipe (7) is fitted with the sealing ring (16), and the external thread block (13) is threadedly connected to the thread groove (11).

6. The calibration device for a circular gear flowmeter according to claim 1, characterized in that: The two clamping assemblies are symmetrical, and the front clamping assembly includes a second fixing block (24), the left side of the second fixing block (24) is in contact with the left side of the arc plate (27), a knob (28) is provided at a distance from the right end of the second fixing block (24), and the left end of the knob (28) is fixedly connected to a bidirectional threaded column (29); The bidirectional threaded column (29) is rotatably connected to the left end of the interior of the second fixed block (24); the outer side of the bidirectional threaded column (29) is threadedly connected to movable plates (30) at both left and right ends of the interior of the second fixed block (24); movable arms (33) are rotatably connected to the upper and lower sides of the opposite ends of the two movable plates (30); and movable plates (31) are provided at both upper and lower ends of the interior of the second fixed block (24); The ends of the movable plates (31) that are away from each other are fixedly connected with a clamping block (32), the ends of the upper and lower movable arms (33) that are away from each other are rotatably connected with the movable plates (31) on the same side, the rear end of the second fixed block (24) is fixedly connected with a connecting block (23); the rear end of the connecting block (23) is fixedly connected with a semi-annular plate (25), the inner side of the semi-annular plate (25) is provided with a plurality of arc-shaped grooves (26) at equal distances, and the outer side of the bottom end of the semi-annular plate (25) is fixedly connected with an arc plate (27).

7. The calibration device for a circular gear flowmeter according to claim 6, characterized in that: The clamping block (32) is slidably connected to the second fixed block (24); the first fixed block (22) is provided with a clamping slot (34) at a corresponding position of the clamping block (32); and the clamping block (32) is clamped and connected to the corresponding clamping slot (34).

8. The calibration device for a circular gear flowmeter according to claim 6, characterized in that: When the opposite side of the semi-annular plate (25) is fitted, the arc groove (26) is engaged with the corresponding annular block (8), and the inner side of the arc plate (27) is fitted with the limiting groove (14).

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