Calibrating device of flow meter

Abstract

The utility model relates to a calibration device of a flowmeter, which comprises a front pipeline, a rear pipeline, a standard flowmeter and a flowmeter to be calibrated, the standard flowmeter is arranged on the front pipeline, the rear end of the front pipeline is fixedly sleeved with a square support plate, and one side of the support plate far away from the front pipeline is fixedly provided with a plurality of positioning rods which are uniformly distributed at intervals along the circumference; first hydraulic cylinders are fixedly erected on the front face, the rear face and the bottom face of the supporting plate, piston rods of the first hydraulic cylinders face the side away from the front pipeline and are fixedly connected with second hydraulic cylinders, and piston rods of the second hydraulic cylinders face the center of the supporting plate and are fixedly connected with pressing blocks. A flange on one side of the flowmeter to be calibrated coaxially abuts against the supporting plate, flange holes in the flange correspond to the positioning rods in a one-to-one mode and are connected with the positioning rods in an inserted mode, and the pressing blocks abut against the sides, away from the front pipeline, of the corresponding flanges. The flowmeter to be calibrated can be conveniently disassembled and assembled before and after calibration, and the flowmeter calibration device is more practical.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flowmeter technical field, concretely relates to a kind of flowmeter's calibration device. BACKGROUND

[0002] Currently, in the electric instrument workshop of chemical production, the use of flowmeter is essential, and in order to ensure the use quality, the flowmeter usually needs to be calibrated. The calibration of the existing flowmeter usually adopts standard device method, that is, the flowmeter to be calibrated is connected in series on a pipeline provided with a standard flowmeter, and then the medium flows through the standard flowmeter and the flowmeter to be calibrated. By comparing the flow values measured by the two, the accuracy of the flowmeter to be calibrated can be obtained. However, in actual calibration operation, the flowmeter to be calibrated is usually installed on the calibration pipeline through flange connection of the flanges at both ends, which is relatively cumbersome to disassemble before and after calibration, affecting the efficiency of the overall calibration operation, and needs to be improved. SUMMARY

[0003] Therefore, the utility model aims at providing a flowmeter calibration device, which can realize convenient disassembly of the flowmeter to be calibrated before and after calibration, to solve the above problems.

[0004] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of a flowmeter calibration device, which comprises a front pipeline, a rear pipeline, a standard flowmeter and a flowmeter to be calibrated. The standard flowmeter is installed on the front pipeline. A square support plate is fixedly sleeved on the rear end of the front pipeline. A plurality of positioning rods are fixedly arranged on the side of the support plate away from the front pipeline. First hydraulic cylinders are fixedly arranged on the front and rear surfaces and the bottom surface of the support plate. The piston rod of the first hydraulic cylinder is fixedly connected with a second hydraulic cylinder, which is away from the front pipeline. The piston rod of the second hydraulic cylinder is fixedly connected with a pressing block, which is directed to the center of the support plate. The flange on one side of the flowmeter to be calibrated is coaxially abutted on the support plate, and the flange hole on the flange corresponds to the positioning rod and is inserted. The pressing block is abutted on the side of the corresponding flange away from the front pipeline. A square fixed plate is fixedly sleeved on the front end of the rear pipeline. A square movable plate is arranged on the side of the fixed plate close to the front pipeline. The center of the movable plate is fixedly connected with the center of the fixed plate through an extension bellows. Third hydraulic cylinders are fixedly arranged on the upper and lower ends of the side of the fixed plate close to the movable plate. The piston rod of the third hydraulic cylinder is fixedly connected with the movable plate. The movable plate is spaced apart from the flange on the other side of the flowmeter to be calibrated, and when the piston rod of the third hydraulic cylinder is elongated, the movable plate can be coaxially abutted on the flange on the other side of the flowmeter to be calibrated.

[0005] Preferably, the positioning rods are matched with the corresponding flange holes.

[0006] Preferably, a sealing gasket is fixed on the side of the support plate away from the front pipeline and on the side of the movable plate away from the rear pipeline.

[0007] Preferably, gate valves are installed at both the front end of the pre-pipeline and the rear end of the post-pipeline.

[0008] Preferably, a flow regulating valve is installed on the pre-pipeline between the gate valve on the pre-pipeline and the standard flow meter.

[0009] Preferably, the upper and lower parts of the support plate are both fixed with L-shaped support frames. The horizontal sections of the two support frames are located above and below the flow meter to be calibrated, respectively, and a fourth hydraulic cylinder is vertically fixed on each horizontal section. The piston rod of the upper fourth hydraulic cylinder faces downward and is fixedly connected to an arc-shaped upper support plate, while the piston rod of the lower fourth hydraulic cylinder faces upward and is fixedly connected to an arc-shaped lower support plate. Both the upper and lower support plates are made of aluminum foam, and the upper support plate can abut against the upper surface of the display instrument of the flow meter to be calibrated, while the lower support plate can abut against the lower surface of the pipe of the flow meter to be calibrated.

[0010] The beneficial effects of this invention are as follows: During calibration, the flow meter to be calibrated can first be placed between the pre-pipeline and the post-pipeline, and the flange hole on one side of the flow meter to be calibrated can be aligned with the positioning rod on the support plate and inserted into place. This allows the flow meter to be coaxially pressed against the support plate, completing the initial positioning and installation of the flow meter. Then, the second hydraulic cylinder is operated, extending its piston rod, which moves the corresponding pressure block towards the center of the corresponding flange until the pressure block is located on the side of the corresponding flange away from the pre-pipeline. Next, the first hydraulic cylinder is operated, retracting its piston rod, which moves the second hydraulic cylinder and the corresponding pressure block towards the side of the corresponding flange until the pressure block presses against the side of the corresponding flange, limiting and fixing the flange, thus completing the further fixed installation of the flow meter to be calibrated. Next, the third hydraulic cylinder is operated, and with the assistance of the telescopic bellows, the movable plate moves towards the flange on the other side of the flowmeter to be calibrated until it presses against the flange. This completes the connection of the entire calibration pipeline. Medium is then transported through this pipeline, flowing through both the standard flowmeter and the flowmeter to be calibrated. By comparing the flow rates measured by the two, the accuracy of the flowmeter to be calibrated can be determined, thus completing the calibration operation. After calibration, the flow of medium is interrupted, and then the third hydraulic cylinder is operated to retract its piston rod, causing the movable plate to return to its original position, separating it from the flowmeter to be calibrated. Then, the first and second hydraulic cylinders are operated sequentially to return the pressure block to its original position, releasing the clamping limit on the corresponding flange of the flowmeter to be calibrated, allowing for easy removal of the flowmeter. Therefore, compared to the original flange connection, this connection method allows for quicker assembly and disassembly of the flowmeter before and after calibration, simplifying operation, ensuring greater efficiency in the overall calibration process, and making it more practical. Attached Figure Description

[0011] Fig. 1 This is a schematic diagram of the main structure of the present invention with the flow meter to be calibrated installed.

[0012] Fig. 2 This is a schematic diagram of the main structure of this utility model without the flow meter to be calibrated installed;

[0013] Fig. 3 This is a schematic diagram of the main structure of the support plate of this utility model;

[0014] Fig. 4 This is a right-side structural schematic diagram of the support plate of this utility model;

[0015] Fig. 5 This is a front view schematic diagram of the flow meter to be calibrated of this utility model when it is installed on the support plate;

[0016] Fig. 6 This is a right-side view of the structure of the flow meter to be calibrated, when it is mounted on the support plate.

[0017] In the diagram, the numbers represent: 1 for the pre-pipeline, 2 for the post-pipeline, 3 for the standard flow meter, 4 for the flow meter to be calibrated, 5 for the support plate, 6 for the positioning rod, 7 for the first hydraulic cylinder, 8 for the second hydraulic cylinder, 9 for the pressure block, 10 for the fixed plate, 11 for the movable plate, 12 for the telescopic bellows, 13 for the third hydraulic cylinder, 14 for the sealing gasket, 15 for the gate valve, 16 for the flow regulating valve, 17 for the support frame, 18 for the fourth hydraulic cylinder, 19 for the upper support plate, and 20 for the lower support plate. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0019] like Figs. 1 to 6As shown, a kind of calibration device of flowmeter, including front pipeline 1, rear pipeline 2, standard flowmeter 3 and the flowmeter 4 to be calibrated.The standard flowmeter 3 is installed on front pipeline 1, and the rear end of front pipeline 1 is fixed with square support plate 5, and a plurality of positioning rods 6 are evenly distributed in the circumferential direction on the side of support plate 5 away from front pipeline 1, and first hydraulic cylinder 7 is fixed and arranged on the front and back of support plate 5 and the bottom surface, and the piston rod of first hydraulic cylinder 7 is away from the side of front pipeline 1 and is fixedly connected with second hydraulic cylinder 8, and the piston rod of second hydraulic cylinder 8 is towards the center of support plate 5 and is fixedly connected with pressure block 9.The flange of the flowmeter 4 to be calibrated is coaxially abutted on support plate 5, and the flange hole on the flange corresponds to positioning rod 6 one by one and is inserted, and pressure block 9 is abutted on the side of corresponding flange away from front pipeline 1.The front end of rear pipeline 2 is fixed with square fixed plate 10, and square movable plate 11 is arranged on the side of fixed plate 10 close to front pipeline 1, and the center of movable plate 11 is fixedly communicated with the center of fixed plate 10 through telescopic bellow 12, and third hydraulic cylinder 13 is fixedly arranged on the upper and lower ends of the side of fixed plate 10 close to movable plate 11, and the piston rod of third hydraulic cylinder 13 is towards movable plate 11 and is fixedly connected with movable plate 11, and movable plate 11 is away from the other side flange of flowmeter 4 to be calibrated, and movable plate 11 can be coaxially abutted on the other side flange of flowmeter 4 to be calibrated under the elongation of the piston rod of third hydraulic cylinder 13;

[0020] When calibrating, the flowmeter to be calibrated can be first placed between the front pipeline 1 and the rear pipeline 2, and the flange hole on one side flange of the flowmeter to be calibrated 4 is aligned with the positioning rod 6 on the support plate 5 and is inserted into position, so that the flowmeter to be calibrated 4 is coaxially abutted on the support plate 5, and the preliminary positioning and installation of the flowmeter to be calibrated 4 is completed. Then, the second hydraulic cylinder 8 is operated, so that the piston rod thereof is elongated, and the corresponding pressure block 9 is driven to move towards the center of the corresponding flange, until the pressure block 9 is located on the side of the corresponding flange away from the front pipeline 1. Then, the first hydraulic cylinder 7 is operated, so that the piston rod thereof is retracted, and the second hydraulic cylinder 8 and the corresponding pressure block 9 are driven to move towards the side surface of the corresponding flange, until the pressure block 9 abuts on the side surface of the corresponding flange, and the corresponding flange is abutted and limited, so that the further fixing and installation of the flowmeter to be calibrated 4 is completed. Then, the third hydraulic cylinder 13 is operated, and under the cooperation of the telescopic bellows 12, the movable plate 11 is driven to move towards the other side flange of the flowmeter to be calibrated 4, until the movable plate 11 abuts on the other side flange of the flowmeter to be calibrated 4, so that the communication of the whole calibration pipeline is completed, and then the medium is conveyed in the pipeline, so that the medium flows through the standard flowmeter 3 and the flowmeter to be calibrated 4, and the precision of the flowmeter to be calibrated is obtained by comparing the flow values measured by the two, and the calibration operation is realized. After the calibration is completed, the medium flow is first interrupted, and then the third hydraulic cylinder 13 is operated, so that the piston rod thereof is retracted, and the movable plate 11 is driven to retreat to the reset position, so that the movable plate 11 is separated from the flowmeter to be calibrated 4, and then the first hydraulic cylinder 7 and the second hydraulic cylinder 8 are operated in sequence, so that the pressure block 9 retreats to the reset position, and the abutting and limiting of the corresponding flange of the flowmeter to be calibrated 4 is released, so that the flowmeter to be calibrated 4 can be easily removed. Therefore, compared with the original flange connection, the connection mode can realize the quick disassembly and assembly of the flowmeter to be calibrated 4 before and after the calibration, the operation is more convenient, the efficiency of the whole calibration operation can be ensured, and the connection mode is more practical.

[0021] In the embodiment, the positioning rod 6 is matched with the corresponding flange hole, so that the flowmeter to be calibrated 4 is smoothly positioned and installed in position.

[0022] In the embodiment, the sealing gaskets 14 are fixedly arranged on the side of the support plate 5 away from the front pipeline 1 and on the side of the movable plate 11 away from the rear pipeline 2, so that the sealing property of the abutting position with the flowmeter to be calibrated 4 is ensured, the medium leakage is avoided, and the calibration operation is smoothly performed.

[0023] In the embodiment, the gate valves 15 are arranged on the front ends of the front pipeline 1 and the rear ends of the rear pipeline 2, so that the opening and closing of the corresponding pipelines before and after the calibration is controlled.

[0024] In the embodiment, the flow regulating valve 16 is arranged on the front pipeline 1 between the gate valve 15 and the standard flowmeter 3 on the front pipeline 1, so that the flow of the corresponding pipeline can be flexibly adjusted according to the actual demand in the actual calibration operation.

[0025] In the embodiment, the upper and lower parts of the support plate 5 are fixedly provided with L-shaped support frames 17, the horizontal sections of the two support frames 17 are respectively located above and below the flow meter 4 to be calibrated, and a fourth hydraulic cylinder 18 is vertically fixed on the horizontal section, the piston rod of the fourth hydraulic cylinder 18 located above is downwardly fixedly connected with an arc-shaped upper supporting plate 19, and the piston rod of the fourth hydraulic cylinder 18 located below is upwardly fixedly connected with an arc-shaped lower supporting plate 20, the upper and lower supporting plates 19 and 20 are made of foamed aluminum, and the upper supporting plate 19 can abut against the upper surface of the display instrument of the flow meter 4 to be calibrated, and the lower supporting plate 20 can abut against the lower surface of the pipeline of the flow meter 4 to be calibrated, so that in actual calibration operation, after the movable plate 11 is pressed against the flange on the other side of the flow meter 4 to be calibrated, the fourth hydraulic cylinders 18 are operated to make the piston rods thereof extend, so as to drive the corresponding upper and lower supporting plates 19 and 20 to move towards the flow meter 4 to be calibrated which is pressed, clamped and fixed, until the upper supporting plate 19 abuts against the upper surface of the display instrument of the flow meter 4 to be calibrated, and the lower supporting plate 20 abuts against the lower surface of the pipeline of the flow meter 4 to be calibrated, in this way, on the one hand, the flow meter 4 to be calibrated can be fixed more firmly, and on the other hand, foamed aluminum is a kind of existing material, has excellent damping, shock absorption and energy absorption characteristics, and the upper and lower supporting plates 19 and 20 made of foamed aluminum can provide good buffering and shock absorption effects for the flow meter to be calibrated, so as to be more beneficial to the stable performance of calibration operation and be more practical. After calibration is completed, the fourth hydraulic cylinders 18 are only needed to be operated to drive the corresponding supporting plates to retreat to the original positions, so as to release the supporting and clamping of the flow meter 4 to be calibrated, and then the flow meter 4 to be calibrated can be disassembled according to the foregoing steps.

[0026] The above only describes the preferred embodiments of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A calibration device for a flow meter, characterized by, The utility model provides a kind of flowmeter calibration device, including front pipeline, rear pipeline, standard flowmeter and to be calibrated flowmeter, the standard flowmeter is installed on front pipeline, square support plate is fixedly sleeved on the rear end of front pipeline, a plurality of positioning rods are fixedly arranged on the side of support plate away from front pipeline, first hydraulic cylinder is fixedly arranged on the front and back of support plate and bottom surface, the piston rod of first hydraulic cylinder is fixedly connected with second hydraulic cylinder towards the side away from front pipeline, the piston rod of second hydraulic cylinder is fixedly connected with pressure block towards the center of support plate, the flange of to be calibrated flowmeter is coaxially contacted on support plate, and flange hole on the flange is corresponding with positioning rod and is inserted, pressure block is contacted on the side of corresponding flange away from front pipeline, square fixed plate is fixedly sleeved on the front end of rear pipeline, square movable plate is arranged on the side of fixed plate close to front pipeline, the center of movable plate is fixedly communicated with the center of fixed plate by telescopic bellow, third hydraulic cylinder is fixedly arranged on the upper and lower ends of the side of fixed plate close to movable plate, the piston rod of third hydraulic cylinder is fixedly connected with movable plate towards movable plate, distance is left between movable plate and the other side flange of to be calibrated flowmeter, and under the elongation of the piston rod of third hydraulic cylinder, movable plate can be coaxially contacted on the other side flange of to be calibrated flowmeter.

2. A flow meter calibration apparatus as claimed in claim 1, wherein, The positioning rod is matched with the corresponding flange hole.

3. The flow meter calibration apparatus of claim 1, wherein, Sealing gasket is fixedly arranged on the side of support plate away from front pipeline and the side of movable plate away from rear pipeline.

4. The flow meter calibration apparatus of claim 1, wherein, Gate valve is installed on the front end of front pipeline and the rear end of rear pipeline.

5. The flow meter calibration apparatus of claim 1, wherein, Flow regulating valve is installed on front pipeline between gate valve on front pipeline and standard flowmeter.

6. The flow meter calibration apparatus of claim 1, wherein, L-shaped support frame is fixedly arranged on the upper and lower parts of support plate, the horizontal section of two support frames is located above and below to be calibrated flowmeter respectively, and fourth hydraulic cylinder is vertically fixedly arranged on the horizontal section, the piston rod of fourth hydraulic cylinder located above is fixedly connected with arc-shaped upper supporting plate downwards, and the piston rod of fourth hydraulic cylinder located below is fixedly connected with arc-shaped lower supporting plate upwards, the upper supporting plate and the lower supporting plate are made of foamed aluminum, and the upper supporting plate can be contacted on the upper surface of display instrument of to be calibrated flowmeter, and the lower supporting plate can be contacted on the lower surface of pipeline of to be calibrated flowmeter.

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