A calibration system and method for electromagnetic flowmeter

Abstract

The present invention relates to the field of electromagnetic flowmeter calibration technology, specifically a calibration system and method for an electromagnetic flowmeter, comprising a test mechanism, two groups of current-breaking portable mechanisms arranged on both sides of the test mechanism, an input process tube installed on one group of current-breaking portable mechanisms, an output process tube installed on the other group of current-breaking portable mechanisms, and a surge current test mechanism arranged on the test mechanism and used for surge current calibration detection. By arranging a first shell and a second shell that can be independently detected outside the sensor of the electromagnetic flowmeter, and installing two groups of progressive discharge components that generate surge current on the two shells, as the surge current in the progressive discharge component gradually progresses toward the sensor, the current flowmeter can perform a resistance test to lightning or surrounding surge current in a simulator in an actual assembly environment while passing the liquid flow calibration test, thereby improving the accuracy of the electromagnetic flowmeter calibration.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic flowmeter calibration, and in particular to a calibration system and method for an electromagnetic flowmeter. Background Art

[0002] Electromagnetic flowmeters are divided into split type electromagnetic flowmeters and integrated type electromagnetic flowmeters according to the display method. Electromagnetic flowmeters have the advantages of no flow obstructions, small pressure loss, low straight pipe section requirements, and high circuit reliability. They can be used to measure the volume flow rate of conductive fluids in closed pipes and are widely used in flow measurement and control in industrial and agricultural production processes such as petrochemicals, steel metallurgy, water supply and drainage, and water conservancy irrigation.

[0003] At present, when the liquid flow conductor passing through the electromagnetic flow meter cuts the magnetic lines of force in the magnetic field, an induced potential will be generated in the liquid flow conductor. The magnitude of the induced potential is proportional to the effective length of the conductor in the magnetic field and the speed at which the conductor moves perpendicular to the magnetic field in the magnetic field. Similarly, when the conductive fluid flows in a vertical direction in the magnetic field and cuts the magnetic induction lines of force, an induced potential will also be generated on the electrodes on both sides of the pipeline. However, traditional calibration only uses liquid flow conductors for detection, but this calibration process still has certain defects. Since the actual installation location of the electromagnetic flowmeter is affected by the power grid in the building, when the power grid or lines around the electromagnetic flowmeter generate surge currents due to lightning, the data using only liquid flow calibration will be disturbed. Therefore, the detection method of liquid flow calibration cannot simulate the electromagnetic flowmeter's resistance to external lightning or surge currents, which will lead to defects in the calibration of the electromagnetic flowmeter.

[0004] In view of this, the present invention designs a calibration system and method for an electromagnetic flowmeter, which can perform calibration detection on the electromagnetic flowmeter's surge current while coordinating with the liquid flow calibration detection, so as to improve the accuracy of the electromagnetic flowmeter's calibration detection. Summary of the invention

[0005] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in the present invention is:

[0007] A calibration system and method for an electromagnetic flowmeter, comprising a test structure, two groups of flow cut-off portable mechanisms arranged on both sides of the test structure, an input flow tube installed on one group of the flow cut-off portable mechanisms, an output flow tube installed on the other group of the flow cut-off portable mechanisms, and a surge current testing mechanism arranged on the test structure and used for surge current calibration detection; the test structure comprises an inner lining flow tube and a sensor installed on the inner lining flow tube; the flow cut-off portable mechanism is used to provide a portable platform for liquid flow calibration detection; the flow cut-off portable mechanism comprises a first end tube installed at the outer end of the inner lining flow tube, an anti-seepage bin installed on the first end tube, and a second end tube installed on the other side of the anti-seepage bin; the input flow tube is used to provide a constant-pressure input for the liquid flow to be tested; the output flow tube is used to provide a constant-pressure output for the liquid flow to be tested; the surge current testing mechanism comprises a sealing test assembly arranged outside the sensor, a sealing ring cover arranged in the sealing test assembly and used to block current overflow, and two groups of progressive discharge assemblies installed on the sealing test assembly.

[0008] In a preferred example, the present invention can be further configured as follows: the mechanism to be tested further includes a converter fixedly mounted on the top of the sensor;

[0009] A connector is installed outside the converter, and a power line is connected to the connector.

[0010] In a preferred example, the present invention can be further configured as follows: the flow cut-off portable mechanism also includes an angle iron support plate fixedly mounted on the anti-seepage bin, a booster screw sleeve movably mounted in the hole at the top end of the anti-seepage bin, an extended screw rod movably mounted inside the booster screw sleeve, and a plug mounted at the bottom end of the extended screw rod;

[0011] The plug is made of rubber material;

[0012] The booster screw sleeve is composed of a threaded sleeve and a hexagonal nut.

[0013] In a preferred example, the present invention can be further configured as follows: the anti-seepage bin is an elliptical structure as a whole, and symmetrically distributed transverse holes are opened on both sides of the bottom of the anti-seepage bin;

[0014] One transverse hole in the anti-seepage chamber is connected to the inner cavity of the first end tube, and the other transverse hole is connected to the inner cavity of the second end tube.

[0015] In a preferred example, the present invention can be further configured as follows: the surge current testing mechanism also includes a traction assembly, two pull rods for providing balanced traction force, and two force arms respectively connected to the two pull rods.

[0016] In a preferred example, the present invention can be further configured as follows: the traction assembly further includes a hydraulic component, a clamping seat mounted on the ends of the two pull rods, a guide rod mounted inside the clamping seat, and a truss mounted on the outer end of the guide rod and the outer end of the hydraulic sub-rod in the hydraulic component;

[0017] The outer end of the guide rod is provided with a No. 1 locking bolt;

[0018] The outer end of the hydraulic sub-rod in the hydraulic component is provided with a No. 2 locking bolt.

[0019] In a preferred example, the present invention may be further configured as follows: the sealing test assembly further includes a first housing and a second housing;

[0020] The semi-cylindrical shells at the bottom of the first shell and the second shell are both provided with cylindrical grooves, and insulating gaskets are arranged in the two cylindrical grooves, and fastening bolts are installed on the insulating gaskets;

[0021] A protective end tube adapted to be clamped on an external connector of the converter is installed on the outside of the first housing;

[0022] The first shell and the second shell are both provided with slots.

[0023] In a preferred example, the present invention can be further configured as follows: screws and nuts are installed on the ports of the first shell and the second shell close to the sealing ring cover, and clamping tubes clamped on the hydraulic component column heads are opened on the end surfaces of the first shell and the second shell away from the sealing ring cover.

[0024] In a preferred example, the present invention can be further configured as follows: the progressive discharge assembly also includes an insulating square tube installed in the slot, a seat installed on the top of the insulating square tube, a beam fixedly installed inside the seat, a limit plate installed on the outer end of the beam, a discharge assembly movably installed inside the insulating square tube, a partition arranged outside the discharge assembly and movably installed on the beam, a return spring arranged outside the beam and fitted between the seat and the partition, and a clamp movably installed on the beam and fitted on the partition.

[0025] In a preferred example, the present invention can be further configured as follows: the discharge assembly is composed of a fan-shaped conductive plate, a T-shaped slide bar, and a wire connected to the contact at the outer end of the T-shaped slide bar;

[0026] A plurality of poles are evenly distributed and installed on the inner side of the sector-shaped conductive plate, and ends of the plurality of poles away from the sector-shaped conductive plate face the sensor.

[0027] A calibration method for an electromagnetic flowmeter, the calibration method comprising:

[0028] When the pipeline forms a closed passage, adjust the two booster screw sleeves to rotate counterclockwise, and the extended screw will be lifted upward by the booster screw sleeve, so that the plug installed at the bottom of the extended screw will rise upward along the inner cavity of the anti-seepage bin. At this time, the inner cavities of the first end tube and the second end tube form a conveying passage. When the material continues to pass through the inner lining flow tube, the sensor conducts the induced current to the converter;

[0029] Start the hydraulic component. As the hydraulic sub-rod inside the hydraulic component extends outward, the two groups of discharge components that are energized release simulated current toward the inner cavity of the insulating square tube through multiple poles. When the hydraulic sub-rod drives the truss, guide rod and clamp to synchronously pull the two pull rods, the two force arms pulled at the same speed by the two pull rods move toward the middle of the converter. At this time, the clamp can push the partition and the discharge component to shrink toward the sensor, and the multiple poles in discharge can perform surge current detection on the sensor. By gradually releasing the surge current to the sensor, the anti-interference calibration test of the tested mechanism to lightning or surrounding current under actual assembly can be simulated.

[0030] By adopting the above technical solution, the beneficial effects achieved by the present invention are:

[0031] 1. The present invention arranges a first shell and a second shell that can be detected independently outside the sensor of the electromagnetic flowmeter, and installs two sets of progressive discharge components that generate surge current on the two shells. As the surge current in the progressive discharge component gradually progresses toward the sensor, the current flowmeter can pass the liquid flow calibration test while also being able to perform a simulator test on the resistance to lightning or surrounding surge current in an actual assembly environment, thereby improving the accuracy of the electromagnetic flowmeter calibration.

[0032] 2. The present invention sets it to a certain length. When the discharge component drives multiple poles to advance toward the sensor, the specific length of the insulating square tube is used to simulate the radiation area of ​​the electromagnetic flowmeter affected by the current of other equipment in the actual installation environment. At the same time, combined with the power line, the surge current is gradually increased toward the sensor, thereby accurately calibrating the data of the electromagnetic flowmeter under actual operation, thereby improving the subsequent protection of the electromagnetic flowmeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the present invention when used;

[0034] Figure 2 This is a schematic diagram of a front calibration test of the present invention;

[0035] Figure 3 It is an explosion schematic diagram of the present invention;

[0036] Figure 4 It is a schematic diagram of the flow cut-off casual installation mechanism of the present invention;

[0037] Figure 5 is a schematic diagram of the mechanism to be tested of the present invention;

[0038] Figure 6 is a schematic diagram of a surge current testing mechanism of the present invention;

[0039] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of point A in the middle;

[0040] Figure 8 It is a schematic diagram of the explosion of the sealing test assembly of the present invention;

[0041] Fig. 9 It is a schematic diagram of the progressive discharge assembly of the present invention.

[0042] Reference numerals:

[0043] 100, the device to be tested; 110, the inner lining flow tube; 120, the sensor; 130, the converter; 140, the power cord;

[0044] 200, flow cut-off mechanism; 210, first end pipe; 220, anti-seepage chamber; 230, second end pipe; 240, angle iron support plate; 250, booster screw sleeve; 260, extension screw; 270, plug;

[0045] 300, input process management;

[0046] 400, output process management;

[0047] 500, surge current test mechanism; 510, sealing test assembly; 511, first shell; 512, protective end tube; 513, second shell; 514, slot; 515, fastening bolt; 516, insulating gasket; 520, sealing ring cover; 530, progressive discharge assembly; 531, insulating square tube; 532, cushion seat; 533, beam; 534, limit plate; 535, clamp; 536, partition; 537, reset spring; 538, discharge assembly; 539, pole; 540, traction assembly; 541, hydraulic parts; 542, truss; 543, guide rod; 544, clamp seat; 550, pull rod; 560, lever arm. DETAILED DESCRIPTION

[0048] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0049] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0050] A calibration system and method for an electromagnetic flowmeter provided by some embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0051] Embodiment 1:

[0052] Combination Figure 1-Figure 9 As shown, the present invention provides a calibration system and method for an electromagnetic flowmeter, comprising a mechanism to be tested 100, two groups of flow cut-off portable mechanisms 200 arranged on both sides of the mechanism to be tested 100, an input flow tube 300 installed on one group of the flow cut-off portable mechanisms 200, an output flow tube 400 installed on the other group of the flow cut-off portable mechanisms 200, and a surge current testing mechanism 500 arranged on the mechanism to be tested 100 and used for surge current calibration detection.

[0053] The test mechanism 100 includes a liner flow tube 110, a sensor 120, a converter 130 and a power cord 140, the current cut-off mechanism 200 includes a first end tube 210, an anti-seepage chamber 220, a second end tube 230, an angle iron support plate 240, a booster screw sleeve 250, an extension screw 260 and a plug 270, and the surge current test mechanism 500 includes a sealing test assembly 510, a sealing ring cover 520, a progressive discharge assembly 530, a traction assembly 540, a pull rod 550 and a force arm 560, and the sealing The sealing test assembly 510 also includes a first shell 511, a protective end tube 512, a second shell 513, a slot 514, a fastening bolt 515 and an insulating gasket 516. The progressive discharge assembly 530 also includes an insulating square tube 531, a cushion seat 532, a beam 533, a limit plate 534, a clamp 535, a partition 536, a return spring 537, a discharge assembly 538 and a pole 539. The traction assembly 540 also includes a hydraulic component 541, a truss 542, a guide rod 543 and a clamp seat 544.

[0054] The tested mechanism 100 includes an inner lining flow tube 110, a sensor 120 installed on the inner lining flow tube 110, and a converter 130 fixedly installed on the top of the sensor 120. A connector is installed on the outside of the converter 130, and a power line 140 is connected to the connector.

[0055] The flow cut-off portable mechanism 200 is used to provide a portable platform for liquid flow calibration and detection;

[0056] The flow cut-off and easy-fitting mechanism 200 comprises a first end tube 210 installed at the outer end of the liner flow tube 110, an anti-seepage bin 220 installed on the first end tube 210, and a second end tube 230 installed on the other side of the anti-seepage bin 220;

[0057] The input process pipe 300 is used to provide a constant pressure input to the liquid flow to be measured;

[0058] The output flow tube 400 is used to provide a constant pressure output for the liquid flow to be measured;

[0059] The surge current test mechanism 500 includes a traction assembly 540, two pull rods 550 for providing balanced traction force, a sealing test assembly 510 disposed outside the sensor 120, a sealing ring cover 520 disposed inside the sealing test assembly 510 and used to block current overflow, two sets of progressive discharge assemblies 530 installed on the sealing test assembly 510, and two force arms 560 respectively connected to the two pull rods 550;

[0060] The traction assembly 540 also includes a hydraulic component 541, a clamping seat 544 mounted on the ends of the two pull rods 550, a guide rod 543 mounted inside the clamping seat 544, and a truss 542 mounted on the outer end of the guide rod 543 and the outer end of the hydraulic sub-rod in the hydraulic component 541;

[0061] A No. 1 locking bolt is provided at the outer end of the guide rod 543;

[0062] The outer end of the hydraulic sub-rod in the hydraulic component 541 is provided with a No. 2 locking bolt.

[0063] Since the installation area of ​​the electromagnetic flowmeter needs to be set according to the layout of the pipeline, the electromagnetic flowmeter will generally encounter thunderstorms during its use. At the same time, there will be power grids around the installation area of ​​the electromagnetic flowmeter, and surge currents will be generated around the lines or sensors instantly, which will damage the instrument in severe cases.

[0064] Surge current damages instruments generally attack lines from three sources: power lines, flow signals and excitation lines of sensors and converters. The sensor is located between the converter and the fluid conduit, and the surrounding power grid will first affect the sensor, thus causing the electromagnetic flowmeter to malfunction and causing other instruments in the control room to malfunction, thus affecting the calibration of the fluid flow by the electromagnetic flowmeter.

[0065] During the liquid flow calibration detection period, the device sets a first shell 511 and a second shell 513 on the outside of the sensor 120. At this time, the first shell 511 and the second shell 513 can be assembled into an independent discharge detection chamber in conjunction with the sealing ring cover 520. After the contacts in the two discharge components 538 are energized through the wires, the current transferred through the discharge component 538 can release the surge current toward the inner cavity of the independent discharge detection chamber through the multiple poles 539. When the discharge component 538 gradually moves toward the sensor 120 from the initial position of the inner cavity of the insulating square tube 531, the multiple poles 539 under continuous discharge and reduced discharge gap can test the sensor 120 against surge current. In conjunction with the continuous flooding and transfer of the liquid flow conductor by the input process tube 300 and the output process tube 400, the test mechanism 100 under liquid flow calibration detection can perform multiple data measurements under the interference of surge current. Finally, by comparing the data after the sensor 120 is measured against surge current, the accuracy of the electromagnetic flowmeter under liquid flow calibration is measured.

[0066] Embodiment 2:

[0067] Combination Figure 1-Figure 4 As shown, on the basis of Example 1, the flow cut-off portable mechanism 200 further includes an angle iron support plate 240 fixedly mounted on the anti-seepage bin 220, a booster screw sleeve 250 movably mounted in the top hole of the anti-seepage bin 220, an extension screw 260 movably mounted inside the booster screw sleeve 250, and a plug 270 mounted at the bottom end of the extension screw 260;

[0068] The plug 270 is made of rubber material;

[0069] The booster screw sleeve 250 is composed of a threaded sleeve and a hexagonal nut;

[0070] The anti-seepage bin 220 is an elliptical structure as a whole, and symmetrically distributed transverse holes are opened on both sides of the bottom of the anti-seepage bin 220;

[0071] One transverse hole in the anti-seepage chamber 220 is connected to the inner cavity of the first end tube 210 , and the other transverse hole is connected to the inner cavity of the second end tube 230 .

[0072] By setting two sets of flow cut-off temporary installation mechanisms 200 symmetrically distributed at both ends of the lining flow tube 110, and by setting two sets of flow cut-off temporary installation mechanisms 200 that are independent and stably controlled between the input process tube 300 and the output process tube 400 of the transfer liquid flow conductor, when the test mechanism 100 is before the anti-surge current detection and after the anti-surge current detection, the two booster screw sleeves 250 are adjusted to boost the two extension screws 260, and the two plugs 270 that are pushed will control the opening and closing of the bottom port of the anti-seepage chamber 220 in real time. Therefore, different test mechanisms 100 can be replaced in time without stopping the continuous delivery of the liquid flow conductor, so as to avoid the presence of air in the liquid flow conductor input in the inner tube of each test mechanism 100 after assembly, and at the same time, the electromagnetic flowmeter can be quickly calibrated and tested without interruption of the liquid flow conductor.

[0073] Embodiment 3:

[0074] Combination Figure 5-Figure 8 As shown, based on the embodiment 1, the sealing test assembly 510 further includes a first housing 511 and a second housing 513;

[0075] The semi-cylindrical shells at the bottom of the first shell 511 and the second shell 513 are both provided with cylindrical grooves, and insulating gaskets 516 are provided in the two cylindrical grooves, and fastening bolts 515 are installed on the insulating gaskets 516;

[0076] A protective end tube 512 adapted to be clamped on the external connector of the converter 130 is installed on the outside of the first housing 511;

[0077] The first shell 511 and the second shell 513 are both provided with a slot 514;

[0078] Screws and nuts are installed on the ports of the first housing 511 and the second housing 513 close to the sealing ring cover 520 , and clamping tubes clamped on the column head of the hydraulic component 541 are opened on the end surfaces of the first housing 511 and the second housing 513 away from the sealing ring cover 520 .

[0079] Two insulating gaskets 516 are respectively assembled in two cylindrical grooves in the first shell 511 and the second shell 513 by two fastening bolts 515. At this time, the two symmetrically distributed insulating gaskets 516 can seal and clamp the tube wall at the bottom of the sensor 120. At this time, the sensor 120 can be exposed in the cavity after the first shell 511 and the second shell 513 are stacked. With the continuous release of the surge current, the surge current that gradually reduces the current gap can simulate the distance between the electromagnetic flowmeter and the power grid in the actual installation area, so as to simulate the interference of the surge current generated around the power grid on the sensor 120, thereby simulating the accuracy of the electromagnetic flowmeter under the interference of the surge current during the liquid flow calibration.

[0080] Embodiment 4:

[0081] Combination Figure 5-Figure 9 As shown, in the above embodiment, the progressive discharge assembly 530 also includes an insulating square tube 531 installed in the slot 514, a cushion seat 532 installed on the top of the insulating square tube 531, a beam 533 fixedly installed inside the cushion seat 532, a limit plate 534 installed at the outer end of the beam 533, a discharge assembly 538 movably installed inside the insulating square tube 531, a partition plate 536 arranged outside the discharge assembly 538 and movably installed on the beam 533, a return spring 537 arranged outside the beam 533 and fitted between the cushion seat 532 and the partition plate 536, and a clamp 535 movably installed on the beam 533 and fitted on the partition plate 536;

[0082] The discharge assembly 538 is composed of a fan-shaped conductive plate, a T-shaped slide bar, and a wire connected to the contact at the outer end of the T-shaped slide bar;

[0083] A plurality of poles 539 are evenly distributed and installed on the inner side of the sector-shaped conductive plate, and the ends of the plurality of poles 539 away from the sector-shaped conductive plate are oriented toward the sensor 120 .

[0084] By simulating the insulating square tube 531 as the distance between the electromagnetic flowmeter and the power grid, when the hydraulic component 541 is running, its internal hydraulic sub-rod will cooperate with the truss 542 and the guide rod 543 to pull the clamp seat 544 and the two pull rods 550, and the two force arms 560 will simultaneously stretch the two clamps 535. At this time, the two clamps 535 will be retracted toward the sensor 120 along the two beams 533, and the pushed partition 536 will control the discharge component 538 to run and shrink along the inner cavity of the insulating square tube 531 as a whole. At this time, the multiple poles 539 in continuous discharge can reduce the discharge gap during the contraction of the inner cavity of the insulating square tube 531. Through the influence of the gradual current on the sensor 120, the surge current resistance data under comparison can be used for auxiliary detection in conjunction with the liquid flow calibration test, so as to conduct a comprehensive test on the accuracy of the liquid flow calibration.

[0085] The working principle and use process of the present invention: Figure 2 The flow chart of the calibration test is based on Faraday's law of electromagnetic induction. In the electromagnetic flowmeter, the conductive medium in the inner lining flow tube 110 is equivalent to the conductive metal rod in the Faraday test. The two electromagnetic coils at the upper and lower ends generate a constant magnetic field. When the conductive medium flows through, an induced voltage is generated. The two electrodes inside the inner lining flow tube 110 measure the generated induced voltage. The measuring pipe is electromagnetically isolated from the fluid and the measuring electrode by non-conductive inner lining rubber, Teflon, etc.

[0086] Among them, the input flow pipe 300 and the output flow pipe 400 are independent pipes for the calibration equipment to transport the flow to be measured. According to the reserved gap between the input flow pipe 300 and the output flow pipe 400, one set of flow cut-off fitting mechanisms 200 are installed on the inner end of the input flow pipe 300 by using multiple sets of combined bolts, and the other set of flow cut-off fitting mechanisms 200 are installed on the inner end of the output flow pipe 400. At this time, the two symmetrically distributed sets of flow cut-off fitting mechanisms 200 will provide a gap for the measured mechanism 100 to be installed, and then multiple sets of bolts are used to fix the two ends of the lining flow pipe 110 with the ends of the two first end pipes 210. At this time, the lining flow pipe 110, the two first end pipes 210 and the two second end pipes 230 will be in a connected state. The plug 270 in the initial state will close the port at the bottom end of the anti-seepage bin 220. Then, the magnetic field of the measured mechanism 100 is calibrated by using a calibration magnet in a state without liquid flow to ensure the uniformity of the magnetic field until the accuracy of the measured mechanism 100 is improved.

[0087] When the pipeline forms a closed passage, the experimenter can adjust the two booster screw sleeves 250 to rotate counterclockwise, and the extended screw 260 will be lifted upward by the booster screw sleeve 250, and the plug 270 installed at the bottom of the extended screw 260 will rise upward along the inner cavity of the anti-seepage bin 220. At this time, the inner cavities of the first end tube 210 and the second end tube 230 can form a passage for conveying materials. When the material continues to pass through the inner lining flow tube 110, the sensor 120 will conduct the induced current to the converter 130, and the hydraulic component 541 can be operated at this time. As the hydraulic sub-rod inside the hydraulic component 541 extends outward, the two sets of discharge components 538 that are energized can release simulated currents toward the inner cavity of the insulating square tube 531 through multiple poles 539. When the hydraulic sub-rod drives the truss 542, the guide rod 543 and the clamp seat 544 to synchronously pull the two pull rods 550, the two force arms 560 pulled at the same speed by the two pull rods 550 move toward the middle of the converter 130. At this time, the clamp 535 can push the partition 536 and the discharge assembly 538 to shrink toward the sensor 120, and the multiple poles 539 in discharge can perform surge current detection on the sensor 120. By gradually releasing the surge current to the sensor 120, the anti-interference calibration test of the tested mechanism 100 to lightning or surrounding current under actual assembly can be simulated, so that the electromagnetic flowmeter can be externally calibrated and tested in conjunction with the surge current while the induced current calibration test is generated by the material.

[0088] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A calibration system for an electromagnetic flowmeter, comprising a mechanism to be tested (100), characterized in that: It also includes two groups of current interruption portable mechanisms (200) arranged on both sides of the mechanism to be tested (100), an input flow tube (300) installed on one group of the current interruption portable mechanisms (200), an output flow tube (400) installed on the other group of the current interruption portable mechanisms (200), and a surge current testing mechanism (500) arranged on the mechanism to be tested (100) and used for surge current calibration detection; The mechanism to be tested (100) comprises an inner lining flow tube (110) and a sensor (120) installed on the inner lining flow tube (110); The flow cut-off portable mechanism (200) is used to provide a portable platform for liquid flow calibration and detection; The flow cut-off mechanism (200) comprises a first end tube (210) installed at the outer end of the liner flow tube (110), an anti-seepage bin (220) installed on the first end tube (210), and a second end tube (230) installed on the other side of the anti-seepage bin (220); The input flow pipe (300) is used to provide a constant pressure input to the liquid flow to be measured; The output flow tube (400) is used to provide a constant pressure output for the liquid flow to be measured; The surge current testing mechanism (500) comprises a sealing test assembly (510) arranged outside the sensor (120), a sealing ring cover (520) arranged inside the sealing test assembly (510) and used to block current overflow, two sets of progressive discharge assemblies (530) installed on the sealing test assembly (510), a traction assembly (540), two pull rods (550) for providing balanced traction force, and two force arms (560) respectively connected to the two pull rods (550).

2. A calibration system for an electromagnetic flowmeter according to claim 1, characterized in that: The mechanism to be tested (100) further comprises a converter (130) fixedly mounted on the top of the sensor (120); A connector is installed on the outside of the converter (130), and a power line (140) is connected to the connector.

3. A calibration system for an electromagnetic flowmeter according to claim 1, characterized in that: The flow-blocking portable mechanism (200) further comprises an angle iron support plate (240) fixedly mounted on the anti-seepage bin (220), a booster screw sleeve (250) movably mounted in a hole at the top end of the anti-seepage bin (220), an extended screw rod (260) movably mounted inside the booster screw sleeve (250), and a plug head (270) mounted at the bottom end of the extended screw rod (260); The plug (270) is made of rubber material; The booster screw sleeve (250) is composed of a threaded sleeve and a hexagonal nut.

4. A calibration system for an electromagnetic flowmeter according to claim 3, characterized in that: The anti-seepage bin (220) is an elliptical structure as a whole, and symmetrically distributed transverse holes are provided on both sides of the bottom of the anti-seepage bin (220); One transverse hole in the anti-seepage chamber (220) is connected to the inner cavity of the first end tube (210), and another transverse hole is connected to the inner cavity of the second end tube (230).

5. A calibration system for an electromagnetic flowmeter according to claim 1, characterized in that: The traction assembly (540) further comprises a hydraulic component (541), a clamping seat (544) mounted on the ends of the two pull rods (550), a guide rod (543) mounted inside the clamping seat (544), and a truss (542) mounted on the outer ends of the guide rod (543) and the outer ends of the hydraulic sub-rods in the hydraulic component (541); A No. 1 locking bolt is provided at the outer end of the guide rod (543); A No. 2 locking bolt is arranged at the outer end of the hydraulic sub-rod in the hydraulic component (541).

6. A calibration system for an electromagnetic flowmeter according to claim 1, characterized in that: The sealing test assembly (510) further comprises a first housing (511) and a second housing (513); A cylindrical groove is provided in the semi-cylindrical shells at the bottom of the first shell (511) and the second shell (513), and an insulating gasket (516) is provided in each of the two cylindrical grooves, and a fastening bolt (515) is installed on the insulating gasket (516); A protective end tube (512) adapted to be clamped on an external joint of the converter (130) is installed on the outside of the first housing (511); A slot (514) is provided in each of the first shell (511) and the second shell (513).

7. A calibration system for an electromagnetic flowmeter according to claim 6, characterized in that: Screws and nuts are installed on ports of the first housing (511) and the second housing (513) close to the sealing ring cover (520), and end surfaces of the first housing (511) and the second housing (513) away from the sealing ring cover (520) are provided with clamping tubes clamped on the column head of the hydraulic component (541).

8. A calibration system for an electromagnetic flowmeter according to claim 1, characterized in that: The progressive discharge assembly (530) further comprises an insulating square tube (531) installed in the slot (514), a cushion seat (532) installed on the top of the insulating square tube (531), a beam (533) fixedly installed inside the cushion seat (532), a limit plate (534) installed at the outer end of the beam (533), a discharge assembly (538) movably installed inside the insulating square tube (531), a partition plate (536) arranged outside the discharge assembly (538) and movably mounted on the beam (533), a return spring (537) arranged outside the beam (533) and abutting between the cushion seat (532) and the partition plate (536), and a clamp (535) movably mounted on the beam (533) and abutting on the partition plate (536).

9. A calibration system for an electromagnetic flowmeter according to claim 8, characterized in that: The discharge assembly (538) is composed of a fan-shaped conductive plate, a T-shaped slide bar, and a wire connected to a contact at the outer end of the T-shaped slide bar; A plurality of evenly distributed poles (539) are installed on the inner side of the sector-shaped conductive plate, and the ends of the plurality of poles (539) away from the sector-shaped conductive plate face the sensor (120).

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