Double-medium calibrating device and method for calibrating liquid level meter

Abstract

The invention provides a double-medium calibrating device and method for calibrating a liquid level meter, and belongs to the technical field of metering instrument calibration. The top end and the bottom end of a lifting mechanism of the double-medium calibrating device are provided with an upper limiting assembly and a lower limiting assembly respectively; the upper limiting assembly and the lower limiting assembly are used for controlling the lifting mechanism to drive the limiting position of the communicating vessel in the movement process, when the communicating vessel reaches the limiting position, overflow of the first medium detection barrel and the first medium communication cavity or overflow of the second medium detection barrel and the second medium communication cavity is conducted, and zero point positioning is conducted; the stability of the liquid level can be ensured through natural overflow, the influence of human factors in the verification process of the liquid level meter is reduced, the zero point position in the verification process can be accurately judged, the liquid level fluctuation and the liquid level stabilization time are shortened, a traceability system of a liquid level meter standard device is improved, and therefore the liquid level meter can obtain effective quantity value traceability.

Description

Technical Field

[0001] The present invention belongs to the technical field of verification of measuring instruments, relates to the metrology technology of liquid level gauges, and specifically relates to a dual-medium verification device and a verification method for liquid level gauge verification. Background Art

[0002] A liquid level gauge is an instrument used to indicate and control the liquid level in industrial process measurement and control systems, and is widely used in the measurement of the internal liquid level or interface of tanks, kettles, towers, bottles, furnaces, channels, etc. in industrial processes, as well as in the production, transportation, storage, and handover links of industries such as petroleum and chemical industries.

[0003] In order to ensure the accuracy of the measurement results of the liquid level gauge and reduce the difference in measurement results between different liquid level gauges, it is necessary to verify the liquid level gauge before it is put into use. The verification process is an important link to ensure the stability and reliability of the liquid level gauge, and is a key step to ensure the accuracy and stability of the measurement results in the industrial production process.

[0004] At present, the liquid level gauge verification methods mainly use the dipstick method or manual comparison using a liquid level gauge with higher accuracy. Both of these methods require manual setting of the liquid level height and manual reading of the indication value. During the verification process, the human influence factor is relatively large, and there are technical problems such as a long time required for the liquid surface to stabilize and inaccurate data reading, which affect the verification effect of the liquid level gauge, resulting in the liquid level gauge not being able to obtain effective value traceability. Summary of the Invention

[0005] In view of the problems described in the above background art, that is, in the prior art, the human influence factor is relatively large during the verification process of the liquid level gauge, and there are technical problems such as a long time required for the liquid surface to stabilize and inaccurate data reading. To solve this technical problem, the present invention proposes a dual-medium verification device and a verification method for liquid level gauge verification.

[0006] The present invention respectively sets an upper limit component and a lower limit component at the top and bottom of the lifting mechanism. The upper limit component and the lower limit component are used to control the limit position during the movement of the lifting mechanism driving the communicating vessel. When the communicating vessel reaches the limit position, overflow occurs in the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity for zero point positioning. Natural overflow can ensure the stability of the liquid level, reduce the influence of human factors during the verification process of the liquid level gauge, can accurately judge the zero point position during the verification process, reduce the liquid surface fluctuation and the liquid surface stabilization time, and improve the traceability system of the liquid level gauge standard device, so that the liquid level gauge can obtain effective value traceability.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A dual-medium calibration device for liquid level gauge calibration, comprising a lifting mechanism, a detection cylinder, a communicating vessel, an upper limit component and a lower limit component. The upper limit component is located at the top of the lifting mechanism, and the lower limit component is located at the bottom of the lifting mechanism. The communicating vessel is connected to the lifting mechanism, and the lifting mechanism drives the communicating vessel to move along the upward or downward stroke direction of the calibration. A liquid level gauge to be calibrated is connected to the detection cylinder, and a standard liquid level gauge is connected to the communicating vessel.

[0009] A first medium communication cavity and a second medium communication cavity are provided on the communicating vessel. The detection cylinder includes a first medium detection cylinder and a second medium detection cylinder. The first medium communication cavity is communicated with the first medium detection cylinder, and the second medium communication cavity is communicated with the second medium detection cylinder.

[0010] During the upward stroke calibration, when the lifting mechanism drives the communicating vessel to move to the limiting position of the lower limit component, the movement stops, and both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the lowest liquid level for zero-point positioning of the upward stroke.

[0011] During the downward stroke calibration, when the lifting mechanism drives the communicating vessel to move to the limiting position of the upper limit component, the movement stops, and both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the highest liquid level for zero-point positioning of the downward stroke.

[0012] Further defined, a plurality of calibration points are set between the zero point of the upward stroke and the zero point of the downward stroke according to the range of the liquid level gauge to be calibrated. During the upward stroke calibration or the downward stroke calibration, when the lifting mechanism drives the communicating vessel to move to the limiting position of each calibration point, liquid medium is first replenished into the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity, and then both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the calibration liquid level corresponding to the calibration point.

[0013] Further defined, the dual-medium calibration device for liquid level gauge calibration further includes a control module, which is used to control the distance that the lifting mechanism drives the communicating vessel to move along the upward or downward stroke direction of the calibration, and determine the calibration result based on the indication value of the standard liquid level gauge corresponding to each calibration point and the indication value of the liquid level gauge to be calibrated.

[0014] Further defined, the dual-medium calibration device for liquid level gauge calibration further includes a first medium storage tank and a second medium storage tank. The outlet of the first medium storage tank is communicated with the inlet of the first medium detection cylinder. The outlet of the first medium detection cylinder is communicated with both the inlet of the first medium communication cavity and the inlet of the first medium storage tank. The outlet of the first medium communication cavity is communicated with the inlet of the first medium storage tank. The outlet of the second medium storage tank is communicated with the inlet of the second medium detection cylinder. The outlet of the second medium detection cylinder is communicated with both the inlet of the second medium communication cavity and the inlet of the second medium storage tank. The outlet of the second medium communication cavity is communicated with the inlet of the second medium storage tank.

[0015] Further defined, the dual-medium calibration device for liquid level gauge calibration further includes a first medium pump and a second medium pump. The outlet of the first medium storage tank is communicated with the inlet of the first medium detection cylinder through the first medium pump. The outlet of the second medium storage tank is communicated with the inlet of the second medium detection cylinder through the second medium pump. Both the upper limit component and the lower limit component are electrically connected to the first medium pump. Both the upper limit component and the lower limit component are also electrically connected to the second medium pump.

[0016] Further defined, the lifting mechanism includes a column, a magnetic grating scale, and a driving transmission component. The magnetic grating scale is fixedly connected to the column and arranged side by side with the column. The magnetic grating scale is electrically connected to the control module. The driving transmission component is connected to the communicator and drives the communicator to move along the upward or downward stroke direction of the calibration.

[0017] The control module is used to control the distance that the lifting mechanism drives the communicator to move along the upward or downward stroke direction of the calibration according to the distance data measured by the magnetic grating scale.

[0018] Further defined, the driving transmission component includes a driving member, a lead screw, and a moving support plate. The power output end of the driving member is connected to the moving support plate through the lead screw. The moving support plate is connected to the communicator. The lead screw is arranged side by side with the column. The driving member is electrically connected to the control module.

[0019] Further defined, the driving transmission component further includes a linear guide rail arranged side by side with the lead screw. The linear guide rail is slidably connected to the moving support plate.

[0020] Further defined, the upper limit component includes an upper origin sensor and an upper limit switch. The upper limit switch is located above the upper origin sensor. The lower limit component includes a lower origin sensor and a lower limit switch. The lower limit switch is located below the lower origin sensor. Both the upper limit switch and the lower limit switch are electrically connected to the first medium pump. Both the upper limit switch and the lower limit switch are also electrically connected to the second medium pump. Both the upper origin sensor and the lower origin sensor are electrically connected to the control module.

[0021] A dual-medium verification method for liquid level gauge verification, which is applied to the above-mentioned dual-medium verification device for liquid level gauge verification, is characterized by including the following steps:

[0022] S1: Set multiple verification points between the zero point of the upper stroke and the zero point of the lower stroke according to the range of the liquid level gauge to be verified;

[0023] S2: Upper stroke verification:

[0024] S2A1: When the lifting mechanism drives the communicating vessel to move to the limiting position of the lower limit component, the lower limit component controls the lifting mechanism to stop moving, and both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the lowest liquid level, so that the zero position of the upper stroke of the standard liquid level gauge is consistent with that of the liquid level gauge to be verified, and the zero positioning of the upper stroke is carried out;

[0025] S2A2: When the lifting mechanism drives the communicating vessel to move to the limiting position of the first verification point, the control module controls the lifting mechanism to stop moving; replenish the liquid medium into the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity, and then both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the verification liquid level of the first verification point, and obtain the indication value of the standard liquid level gauge corresponding to the first verification point and the indication value of the liquid level gauge to be verified;

[0026] S2A3: Repeat step S2A2, and sequentially traverse the remaining verification points along the upper stroke direction to obtain the indication values of the standard liquid level gauge corresponding to the remaining verification points and the indication values of the liquid level gauge to be verified;

[0027] S2A4: During the upper stroke verification process, the control module acquires the indication values of the standard liquid level gauge corresponding to each verification point and the indication values of the liquid level gauge to be verified, and determines the upper stroke verification result based on the indication values of the standard liquid level gauge corresponding to each verification point and the indication values of the liquid level gauge to be verified;

[0028] Lower stroke verification:

[0029] S2B1: When the lifting mechanism drives the communicating vessel to move to the limiting position of the upper limit component, the upper limit component controls the lifting mechanism to stop moving, and both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the highest liquid level, so that the zero position of the lower stroke of the standard liquid level gauge is consistent with that of the liquid level gauge to be verified, and the zero positioning of the lower stroke is carried out;

[0030] S2B2: When the lifting mechanism drives the communicating vessel to move to the limiting position at the penultimate calibration point, the control module controls the lifting mechanism to stop moving; liquid medium is replenished into the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity. Then, both the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity overflow to the calibration liquid level at the penultimate calibration point, and the indication value of the standard level gauge and the indication value of the level gauge to be calibrated corresponding to the penultimate calibration point are obtained.

[0031] S2B3: Repeat step S2B2, sequentially traverse the remaining calibration points along the downward stroke direction, and obtain the indication values of the standard level gauge and the level gauge to be calibrated corresponding to the remaining calibration points.

[0032] S2B4: During the downward stroke calibration process, the control module acquires the indication values of the standard level gauge and the level gauge to be calibrated corresponding to each calibration point, and determines the downward stroke calibration result based on the indication values of the standard level gauge and the level gauge to be calibrated corresponding to each calibration point.

[0033] Compared with the prior art, the present invention adopts the following technical solutions:

[0034] 1. The present invention provides a dual-medium calibration device for level gauge calibration, which is provided with an upper limit component and a lower limit component at the top and bottom of the lifting mechanism respectively. The upper limit component and the lower limit component are used to control the limiting position during the movement of the lifting mechanism driving the communicating vessel. When the communicating vessel reaches the limiting position, overflow occurs in the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity for zero-point positioning. Natural overflow can ensure the stability of the liquid level, reduce the influence of human factors during the level gauge calibration process, accurately judge the zero-point position during the calibration process, reduce the liquid level fluctuation and the liquid level stabilization time, and improve the traceability system of the level gauge standard device, so that the level gauge can obtain effective quantity traceability.

[0035] 2. The present invention provides a dual-medium calibration device for level gauge calibration, which further includes a control module. By controlling the control module, the distance that the lifting mechanism drives the communicating vessel to move along the upward or downward stroke direction of calibration is controlled, and the calibration result is determined simultaneously, realizing the automatic calibration of the level gauge.

[0036] 3. In the present invention, a first medium communication cavity and a second medium communication cavity are provided on the communicating vessel, and the detection cylinder includes a first medium detection cylinder and a second medium detection cylinder. The calibration of level gauges with different media is realized by the same calibration device. It can not only calibrate the level gauge of water medium, but also calibrate the level gauge of oil medium, avoiding the need to provide different interfaces for different liquid media, facilitating the installation of the level gauge, and improving the calibration efficiency.

[0037] 4. In the present invention, the lifting mechanism includes a column, a magnetic grating scale, and a driving transmission assembly. The column is used to fix the magnetic grating scale and at the same time provide a moving fulcrum for the magnetic grating scale, improving the stability of the driving transmission assembly to drive the communicating vessel to move. At the same time, the magnetic grating scale transmits the measured distance data to the controller, which is used for the control module to control the distance that the lifting mechanism drives the communicating vessel to move along the verified upward or downward stroke direction, improving the moving accuracy of the communicating vessel, and thus improving the verification accuracy of the liquid level gauge.

[0038] 5. In the present invention, the driving transmission assembly further includes a linear guide rail arranged side by side with the lead screw. The linear guide rail is slidably connected to the moving support plate, improving the stability of the moving support plate to drive the communicating vessel to move along the liquid level lifting direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 is a schematic structural diagram of the liquid level gauge verification device of the present invention Figure 1 ;

[0040] Figure 2 is a schematic structural diagram of the liquid level gauge verification device of the present invention Figure 2 ;

[0041] Wherein, 1 - lifting mechanism, 101 - column, 102 - magnetic grating scale, 103 - linear guide rail, 104 - lead screw, 105 - moving support plate, 2 - detection cylinder, 201 - first medium detection cylinder, 202 - second medium detection cylinder, 3 - fixed seat, 4 - first medium storage tank, 5 - second medium storage tank, 6 - first medium pump, 7 - second medium pump, 8 - communicating vessel, 9 - standard liquid level gauge, 10 - fixed frame body, 11 - first clamping ring, 12 - second clamping ring, 13 - liquid level plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The technical solutions of the present invention will be further explained below in conjunction with the drawings and embodiments, but the present invention is not limited to the following described embodiments.

[0043] See Figure 1 and Figure 2, the present invention provides a dual - medium calibration device for liquid level gauge calibration, which includes a lifting mechanism 1, a detection cylinder 2, a communicating vessel 8, an upper limit component, a lower limit component, a first medium storage tank 4, a second medium storage tank 5, a first medium pump 6 and a second medium pump 7. A first medium communication cavity and a second medium communication cavity are provided on the communicating vessel 8; the detection cylinder 2 includes a first medium detection cylinder 201 and a second medium detection cylinder 202. The first medium communication cavity is communicated with the first medium detection cylinder 201, and the second medium communication cavity is communicated with the second medium detection cylinder 202; specifically, the outlet of the first medium storage tank 4 is communicated with the inlet of the first medium detection cylinder 201, the outlet of the first medium detection cylinder 201 is communicated with the inlet of the first medium communication cavity and the inlet of the first medium storage tank 4, and the outlet of the first medium communication cavity is communicated with the inlet of the first medium storage tank 4; the outlet of the second medium storage tank 5 is communicated with the inlet of the second medium detection cylinder 202, the outlet of the second medium detection cylinder 202 is communicated with the inlet of the second medium communication cavity and the inlet of the second medium storage tank 5, and the outlet of the second medium communication cavity is communicated with the inlet of the second medium storage tank 5.

[0044] Preferably, the dual - medium calibration device for liquid level gauge calibration of the present invention further includes a first medium pump 6 arranged between the first medium storage tank 4 and the communicating vessel 8 and a second medium pump 7 arranged between the second medium storage tank 5 and the communicating vessel 8. Specifically, the outlet of the first medium storage tank 4 is communicated with the inlet of the first medium detection cylinder 201 through the first medium pump 6, and the outlet of the second medium storage tank 5 is communicated with the inlet of the second medium detection cylinder 202 through the second medium pump 7; both the upper limit component and the lower limit component are electrically connected to the first medium pump 6, and both the upper limit component and the lower limit component are also electrically connected to the second medium pump 7.

[0045] In the present invention, the upper limit component is located at the top of the lifting mechanism 1, and the lower limit component is located at the bottom of the lifting mechanism 1; the communicating vessel 8 is connected to the lifting mechanism 1, and the lifting mechanism 1 drives the communicating vessel 8 to move along the upward or downward stroke direction of the calibration; a liquid level gauge to be calibrated is connected to the detection cylinder 2, and a standard liquid level gauge 9 is connected to the communicating vessel 8.

[0046] In the present invention, during the upward stroke calibration, when the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the lower limit component, the movement stops, and both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the lowest liquid level for zero - point positioning of the upward stroke; during the downward stroke calibration, when the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the upper limit component, the movement stops, and both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the highest liquid level for zero - point positioning of the downward stroke.

[0047] In the present invention, a plurality of calibration points are set between the zero point of the upward stroke and the zero point of the downward stroke according to the range of the liquid level gauge to be calibrated. Specifically, the plurality of calibration points may be evenly spaced along the upward stroke or the downward stroke, or may be unevenly spaced along the upward stroke or the downward stroke; when performing the upward stroke calibration or the downward stroke calibration, when the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of each calibration point, liquid medium is first replenished into the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity, and then the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity both overflow to the calibration liquid level of the corresponding calibration point.

[0048] The dual-medium calibration device for liquid level gauge calibration of the present invention further includes a control module, which is used to control the distance that the lifting mechanism 1 drives the communicating vessel 8 to move along the upward stroke direction or the downward stroke direction of the calibration, and determine the calibration result based on the indication value of the standard liquid level gauge 9 corresponding to each calibration point and the indication value of the liquid level gauge to be calibrated. Specifically, the control module compares the indication value of the standard liquid level gauge 9 with the indication value of the liquid level gauge to be calibrated, and determines whether the error of the liquid level gauge to be calibrated is within the required range according to the requirements of the liquid level gauge calibration regulation JJG 971-2019, so as to determine the calibration result.

[0049] In the present invention, the lifting mechanism 1 includes a column 101, a magnetic grating ruler 102 and a driving transmission assembly. The magnetic grating ruler 102 is fixedly connected to the column 101 and arranged side by side with the column 101; the magnetic grating ruler 102 is electrically connected to the control module; the driving transmission assembly is connected to the communicating vessel 8 and drives the communicating vessel 8 to move along the upward stroke direction or the downward stroke direction of the calibration; the control module is used to control the distance that the lifting mechanism 1 drives the communicating vessel 8 to move along the upward stroke direction or the downward stroke direction of the calibration according to the distance data measured by the magnetic grating ruler 102.

[0050] Preferably, in the present invention, a liquid level plate 13 is arranged radially in the communicating vessel 8. When the communicating vessel 8 is at the zero point position of the upward stroke, the liquid level plate 13 is flush with the lowest liquid level; when the communicating vessel 8 is at the zero point position of the downward stroke, the liquid level plate 13 is flush with the highest liquid level.

[0051] In the present invention, the driving and transmission assembly includes a driving member, a lead screw 104, and a moving platen 105. The power output end of the driving member is connected to the moving platen 105 through the lead screw 104. The moving platen 105 is connected to the communicating vessel 8. The lead screw 104 is arranged side by side with the column 101. The driving member is electrically connected to the control module. Under the driving force of the driving member, the lead screw 104 rotates, thereby driving the moving platen 105 threadedly connected thereto to move in the upstroke direction or the downstroke direction, and then driving the communicating vessel 8 to move in the upstroke direction or the downstroke direction through the moving platen 105. Preferably, the driving member is a motor. In addition, it can also be other driving structures well-known to those skilled in the art. The control module controls the start and stop of the driving member, thereby controlling the distance that the moving platen 105 drives the communicating vessel 8 to move in the upstroke direction or the downstroke direction.

[0052] Preferably, in the present invention, the driving and transmission assembly further includes a linear guide rail 103 arranged side by side with the lead screw 104. The linear guide rail 103 is slidably connected to the moving platen 105. The linear guide rail 103 is used to guide the moving platen 105, improve the stability of the moving platen 105 during movement, and thus improve the accuracy of liquid level gauge calibration.

[0053] A dual-medium calibration device for liquid level gauge calibration in the present invention further includes a fixed frame body 10. The tops of the first medium detection cylinder 201 and the second medium detection cylinder 202 are both fixedly connected to the fixed frame body 10. The first medium detection cylinder 201 and the second medium detection cylinder 202 are fixedly supported through the fixed frame body 10.

[0054] Preferably, in the present invention, a first clamping ring 11 is provided on the first medium detection cylinder 201, and a second clamping ring 12 is provided on the second medium detection cylinder 202. The first clamping ring 11 is used to fix the liquid level gauge to be calibrated on the first medium detection cylinder 201, and the second clamping ring 12 is used to fix the liquid level gauge to be calibrated on the second medium detection cylinder 202.

[0055] In the present invention, fixed seats 3 are provided at the bottoms of the first medium detection cylinder 201, the second medium detection cylinder 202, and the lifting mechanism 1. The first medium detection cylinder 201, the second medium detection cylinder 202, and the lifting mechanism 1 are fixedly connected through the fixed seats 3.

[0056] In the present invention, the upper limit component includes an upper origin sensor and an upper limit switch, and the upper limit switch is located above the upper origin sensor; the lower limit component includes a lower origin sensor and a lower limit switch, and the lower limit switch is located below the lower origin sensor. Both the upper limit switch and the lower limit switch are electrically connected to the first medium pump 6, and both the upper limit switch and the lower limit switch are also electrically connected to the second medium pump 7; both the upper origin sensor and the lower origin sensor are electrically connected to the control module. Specifically, when the communicating vessel 8 is at the zero position of the upward stroke, the upper limit switch controls the first medium pump 6 or the second medium pump 7 to close, and stops delivering the liquid medium to the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity; when the communicating vessel 8 is at the zero position of the downward stroke, the lower limit switch controls the first medium pump 6 or the second medium pump 7 to close, and stops delivering the liquid medium to the first medium detection cylinder and the first medium communication cavity or the second medium detection cylinder and the second medium communication cavity. The upper origin sensor is used to detect the position information when the communicating vessel 8 is at the zero point of the upward stroke, and send the position information to the control module; the lower origin sensor is used to detect the position information when the communicating vessel 8 is at the zero point of the downward stroke, and send the position information to the control module. The control module controls the driving member to start the upward stroke verification based on the position information sent by the upper origin sensor, and the control module controls the driving member to start the downward stroke verification based on the position information sent by the lower origin sensor.

[0057] The present invention also provides a dual-medium verification method for liquid level gauge verification, which is applied to the above-mentioned dual-medium verification device for liquid level gauge verification, and includes the following steps:

[0058] S1: Set a plurality of verification points between the zero point of the upward stroke and the zero point of the downward stroke according to the range of the liquid level gauge to be verified;

[0059] S2: Upward stroke verification:

[0060] S2A1: When the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the lower limit component, the lower limit component controls the lifting mechanism 1 to stop moving, and both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the lowest liquid level, so that the standard liquid level gauge 9 is consistent with the zero position of the upward stroke of the liquid level gauge to be verified, and the zero positioning of the upward stroke is performed;

[0061] S2A2: When the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the first calibration point, the control module controls the lifting mechanism 1 to stop moving; liquid medium is replenished into the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity. Then, both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the calibration liquid level at the first calibration point, and the indication value of the standard level gauge 9 corresponding to the first calibration point and the indication value of the level gauge to be calibrated are obtained.

[0062] S2A3: Repeat step S2A2, and sequentially traverse the remaining calibration points along the upward stroke direction to obtain the indication values of the standard level gauge 9 corresponding to the remaining calibration points and the indication values of the level gauge to be calibrated.

[0063] S2A4: During the upward stroke calibration process, the control module obtains the indication values of the standard level gauge 9 corresponding to each calibration point and the indication values of the level gauge to be calibrated, and determines the upward stroke calibration result based on the indication values of the standard level gauge 9 corresponding to each calibration point and the indication values of the level gauge to be calibrated.

[0064] Downward stroke calibration:

[0065] S2B1: When the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the upper limit component, the upper limit component controls the lifting mechanism 1 to stop moving, and both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the highest liquid level, so that the zero position of the downward stroke of the standard level gauge 9 is consistent with that of the level gauge to be calibrated, and the zero positioning of the downward stroke is performed.

[0066] S2B2: When the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the penultimate calibration point, the control module controls the lifting mechanism 1 to stop moving; liquid medium is replenished into the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity. Then, both the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity overflow to the calibration liquid level at the penultimate calibration point, and the indication value of the standard level gauge 9 corresponding to the penultimate calibration point and the indication value of the level gauge to be calibrated are obtained.

[0067] S2B3: Repeat step S2B2, and sequentially traverse the remaining calibration points along the downward stroke direction to obtain the indication values of the standard level gauge 9 corresponding to the remaining calibration points and the indication values of the level gauge to be calibrated.

[0068] S2B4: During the downward stroke calibration process, the control module obtains the indication values of the standard level gauge 9 corresponding to each calibration point and the indication values of the level gauge to be calibrated, and determines the downward stroke calibration result based on the indication values of the standard level gauge 9 corresponding to each calibration point and the indication values of the level gauge to be calibrated.

[0069] Preferably, a liquid level switch is provided at the position of each inspection point in the present invention, and the liquid level switch at each inspection point is electrically connected to the control module. The liquid level switch is used to control the replenishment of the liquid medium to the first medium detection cylinder 201 and the first medium communication cavity or the second medium detection cylinder 202 and the second medium communication cavity corresponding to each inspection point.

[0070] The first medium and the second medium in the present invention can be the same liquid medium or different liquid media. As a preferred embodiment of the present invention, the first medium and the second medium in the present invention are different liquid media. For example, the first medium is water and the second medium is oil. Hereinafter, a dual-medium calibration method for a liquid level gauge in the present invention with the first medium being water will be specifically described, and the calibration process of the second medium is exactly the same as that of the first medium.

[0071] A dual-medium calibration method for a liquid level gauge includes the following steps:

[0072] Three inspection points are set between the zero point of the upstroke and the zero point of the downstroke according to the range of the liquid level gauge to be calibrated, which are respectively the first inspection point, the second inspection point, and the third inspection point arranged in sequence along the upstroke direction. Among them, the first inspection point, the second inspection point, and the third inspection point are equally spaced.

[0073] Upstroke calibration:

[0074] When the lifting mechanism 1 drives the communicator 8 to move to the limiting position of the lower limit switch, the lower limit component controls the driving member of the lifting mechanism 1 to stop, thereby controlling the lifting mechanism 1 to stop moving. The water in the first medium detection cylinder 201 and the water in the first medium communication cavity both overflow to the lowest liquid level, so that the standard liquid level gauge 9 is consistent with the upstroke zero point position of the liquid level gauge to be calibrated, thereby performing the zero point positioning of the upstroke;

[0075] The position information detected by the lower origin sensor is sent to the control module. The control module controls the driving member of the lifting mechanism 1 to start based on the position information detected and sent by the lower origin sensor, drives the communicator 8 to move, and the magnetic grating ruler 102 detects the position information of the movement of the communicator 8 in real time and sends the position information of the movement of the communicator 8 to the control module. The control module determines whether the communicator 8 has moved to the first inspection point based on the position information of the movement of the communicator 8. If the communicator 8 has moved to the first inspection point, the control module stops the driving member of the lifting mechanism 1 through the liquid level switch at the first inspection point, otherwise, the communicator 8 continues to move; when the communicator 8 has moved to the first inspection point, the control module opens the first medium pump 6 through the liquid level switch at the first inspection point to replenish water to the first medium detection cylinder 201 and the first medium communication cavity. Then, the first medium detection cylinder 201 and the first medium communication cavity both overflow to the calibration liquid level at the first inspection point, and the indication value of the standard liquid level gauge 9 corresponding to the first inspection point and the indication value of the liquid level gauge to be calibrated are obtained;

[0076] Repeat the verification process of the first verification point, and complete the verifications of the second verification point and the third verification point in sequence, respectively obtaining the indication values of the standard level gauge 9 corresponding to the second verification point and the third verification point and the indication values of the level gauge to be verified;

[0077] During the upstroke verification process, the control module obtains the indication values of the standard level gauge 9 corresponding to the first verification point, the second verification point, and the third verification point and the indication values of the level gauge to be verified, and determines the upstroke verification result based on the indication values of the standard level gauge 9 corresponding to the first verification point, the second verification point, and the third verification point and the indication values of the level gauge to be verified. Specifically, the control module compares the indication values of the standard level gauge 9 corresponding to the first verification point, the second verification point, and the third verification point and the indication values of the level gauge to be verified, and determines whether the error of the level gauge to be verified is within the required range according to the requirements of the JJG 971-2019 Level Gauge Verification Regulation, so as to determine the upstroke verification result.

[0078] Downstroke verification:

[0079] When the lifting mechanism 1 drives the communicating vessel 8 to move to the limiting position of the upper limit component, the upper limit component controls the driving member of the lifting mechanism 1 to stop, thereby controlling the lifting mechanism 1 to stop moving. The water in the first medium detection cylinder 201 and the water in the first medium communication cavity both overflow to the highest liquid level, making the downstroke zero position of the standard level gauge 9 and the level gauge to be verified consistent, so as to perform the zero positioning of the downstroke;

[0080] The position information detected by the upper origin sensor is sent to the control module. The control module controls the driving member of the lifting mechanism 1 to start based on the position information detected and sent by the upper origin sensor, drives the communicating vessel 8 to move, the magnetic grating ruler 102 detects the position information of the movement of the communicating vessel 8 in real time, and sends the position information of the movement of the communicating vessel 8 to the control module. The control module determines whether the communicating vessel 8 has moved to the third verification point based on the position information of the movement of the communicating vessel 8. If the communicating vessel 8 has moved to the third verification point, the control module stops the driving member of the lifting mechanism 1. Otherwise, the communicating vessel 8 continues to move; when the communicating vessel 8 has moved to the third verification point, the control module opens the first medium pump 6 through the level switch at the third verification point to supplement water to the first medium detection cylinder 201 and the first medium communication cavity. Then, the first medium detection cylinder 201 and the first medium communication cavity both overflow to the verification liquid level at the third verification point, obtaining the indication values of the standard level gauge 9 corresponding to the first verification point and the indication values of the level gauge to be verified;

[0081] Repeat the verification process of the third verification point, and complete the verifications of the second verification point and the first verification point in sequence, respectively obtaining the indication values of the standard level gauge 9 corresponding to the second verification point and the first verification point and the indication values of the level gauge to be verified;

[0082] During the downward stroke verification process, the control module obtains the indicated values of the standard level gauge 9 corresponding to the third verification point, the second verification point, and the first verification point, as well as the indicated value of the level gauge to be verified, and determines the downward stroke verification result based on the indicated values of the standard level gauge 9 corresponding to the third verification point, the second verification point, and the first verification point and the indicated value of the level gauge to be verified. Specifically, the control module compares the indicated values of the standard level gauge 9 corresponding to the third verification point, the second verification point, and the first verification point with the indicated value of the level gauge to be verified, and determines whether the error of the level gauge to be verified is within the required range according to the requirements of the JJG 971-2019 Level Gauge Verification Regulation, so as to determine the downward stroke verification result.

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A dual-medium calibration device for level gauge calibration, characterized in that: The invention comprises a lifting mechanism (1), a detection cylinder (2), a communicating vessel (8), an upper limit assembly and a lower limit assembly, wherein the upper limit assembly is located at the top end of the lifting mechanism (1), and the lower limit assembly is located at the bottom end of the lifting mechanism (1); the communicating vessel (8) is connected to the lifting mechanism (1), and the communicating vessel (8) is driven by the lifting mechanism (1) to move along an upward stroke direction or a downward stroke direction of calibration; the detecting cylinder (2) is connected to a liquid level gauge to be calibrated, and the communicating vessel (8) is connected to a standard liquid level gauge (9); The communicating vessel (8) is provided with a first medium communicating cavity and a second medium communicating cavity; the detection cylinder (2) comprises a first medium detecting cylinder (201) and a second medium detecting cylinder (202), the first medium communicating cavity is connected to the first medium detecting cylinder (201), and the second medium communicating cavity is connected to the second medium detecting cylinder (202); When performing an upward stroke test, when the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the lower limit assembly, the movement stops, and the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity overflow to the lowest liquid level, and the zero point positioning of the upward stroke is performed; When performing a downstroke test, when the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the upper limit assembly, the movement stops, and the first medium detection cylinder (201) and the first medium communication chamber or the second medium detection cylinder (202) and the second medium communication chamber overflow to the highest liquid level, and the zero point positioning of the downstroke is performed.

2. The dual-medium calibration device for level gauge calibration according to claim 1, characterized in that: A plurality of calibration points are set between the zero point of the upstroke and the zero point of the downstroke according to the measuring range of the liquid level meter to be calibrated. When the upstroke calibration or the downstroke calibration is performed, the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of each calibration point, and the liquid medium is firstly added to the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity, and then the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity overflow to the calibration liquid level of the corresponding calibration point.

3. The dual-medium calibration device for level gauge calibration according to claim 2, characterized in that: The dual-medium calibration device for calibrating a liquid level meter also includes a control module, which is used to control the lifting mechanism (1) to drive the communicating vessel (8) to move along the upward stroke direction or the downward stroke direction of the calibration, and to determine the calibration result based on the indication of the standard liquid level meter (9) corresponding to each calibration point and the indication of the liquid level meter to be calibrated.

4. The dual-medium calibration device for level gauge calibration according to claim 3, characterized in that: The dual-medium calibration device for calibrating a liquid level gauge further comprises a first medium storage tank (4) and a second medium storage tank (5); the outlet of the first medium storage tank (4) is connected to the inlet of the first medium detection cylinder (201); the outlet of the first medium detection cylinder (201) is connected to the inlet of the first medium communication chamber and the inlet of the first medium storage tank (4); the outlet of the first medium communication chamber is connected to the inlet of the first medium storage tank (4); the outlet of the second medium storage tank (5) is connected to the inlet of the second medium detection cylinder (202); the outlet of the second medium detection cylinder (202) is connected to the inlet of the second medium communication chamber and the inlet of the second medium storage tank (5); the outlet of the second medium communication chamber is connected to the inlet of the second medium storage tank (5).

5. The dual-medium calibration device for level gauge calibration according to claim 4, characterized in that: The dual-medium calibration device for level gauge calibration also includes a first medium pump (6) and a second medium pump (7); the outlet of the first medium storage tank (4) is connected to the inlet of the first medium detection cylinder (201) through the first medium pump (6); the outlet of the second medium storage tank (5) is connected to the inlet of the second medium detection cylinder (202) through the second medium pump (7); the upper limit assembly and the lower limit assembly are both electrically connected to the first medium pump (6); and the upper limit assembly and the lower limit assembly are also both electrically connected to the second medium pump (7).

6. The dual-medium calibration device for level gauge calibration according to claim 3, characterized in that: The lifting mechanism (1) comprises a column (101), a magnetic scale (102) and a drive transmission assembly, wherein the magnetic scale (102) is fixedly connected to the column (101) and arranged side by side with the column (101); the magnetic scale (102) is electrically connected to a control module; the drive transmission assembly is connected to a connecting vessel (8) and drives the connecting vessel (8) to move along a verified upward stroke direction or downward stroke direction; The control module is used to control the lifting mechanism (1) to drive the communicating vessel (8) to move along the calibrated upward stroke direction or downward stroke direction according to the distance data measured by the magnetic scale (102).

7. The dual-medium calibration device for level gauge calibration according to claim 6, characterized in that: The drive transmission assembly comprises a driving member, a lead screw (104) and a movable support plate (105); the power output end of the driving member is connected to the movable support plate (105) via the lead screw (104); the movable support plate (105) is connected to the connecting vessel (8); the lead screw (104) and the column (101) are arranged side by side; and the driving member is electrically connected to a control module.

8. The dual-medium calibration device for level gauge calibration according to claim 7, characterized in that: The drive transmission assembly further comprises a linear guide rail (103) arranged side by side with the lead screw (104), and the linear guide rail (103) is slidably connected to the movable support plate (105).

9. The dual-medium calibration device for level gauge calibration according to claim 5, characterized in that: The upper limit assembly comprises an upper origin sensor and an upper limit switch, wherein the upper limit switch is located above the upper origin sensor; the lower limit assembly comprises a lower origin sensor and a lower limit switch, wherein the lower limit switch is located below the lower origin sensor, wherein the upper limit switch and the lower limit switch are both electrically connected to the first medium pump (6), and the upper limit switch and the lower limit switch are also both electrically connected to the second medium pump (7); and the upper origin sensor and the lower origin sensor are both electrically connected to the control module.

10. A dual-medium calibration method for liquid level gauge calibration, applied to the dual-medium calibration device for liquid level gauge calibration as claimed in claim 3, characterized in that: The following steps are involved: S1: Set multiple calibration points between the zero point of the upper stroke and the zero point of the lower stroke according to the range of the liquid level meter to be calibrated; S2: Upper stroke verification: S2A1: When the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the lower limit assembly, the lower limit assembly controls the lifting mechanism (1) to stop moving, and the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity are overflowed to the lowest liquid level, so that the upper stroke zero point position of the standard liquid level gauge (9) and the liquid level gauge to be calibrated is consistent, and the upper stroke zero point positioning is performed; S2A2: When the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the first calibration point, the control module controls the lifting mechanism (1) to stop moving; liquid medium is added to the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity, and then the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity all overflow to the calibration liquid level of the first calibration point, and the indication of the standard liquid level meter (9) corresponding to the first calibration point and the indication of the liquid level meter to be calibrated are obtained; S2A3: repeat step S2A2, traverse the remaining calibration points in turn along the upward stroke direction, and obtain the indications of the standard liquid level gauge (9) and the indications of the liquid level gauge to be calibrated corresponding to the remaining calibration points; S2A4: During the upstroke calibration process, the control module obtains the indication of the standard liquid level gauge (9) corresponding to each calibration point and the indication of the liquid level gauge to be calibrated, and determines the upstroke calibration result based on the indication of the standard liquid level gauge (9) corresponding to each calibration point and the indication of the liquid level gauge to be calibrated; Downstroke verification: S2B1: When the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the upper limit assembly, the upper limit assembly controls the lifting mechanism (1) to stop moving, and the first medium detection cylinder (201) and the first medium communication chamber or the second medium detection cylinder (202) and the second medium communication chamber both overflow to the highest liquid level, so that the zero point position of the downstroke of the standard liquid level gauge (9) is consistent with that of the liquid level gauge to be calibrated, and the zero point positioning of the downstroke is performed; S2B2: When the lifting mechanism (1) drives the communicating vessel (8) to move to the limit position of the penultimate calibration point, the control module controls the lifting mechanism (1) to stop moving; liquid medium is added to the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity, and then the first medium detection cylinder (201) and the first medium communication cavity or the second medium detection cylinder (202) and the second medium communication cavity all overflow to the calibration liquid level of the penultimate calibration point, and the indication of the standard liquid level meter (9) corresponding to the penultimate calibration point and the indication of the liquid level meter to be calibrated are obtained; S2B3: repeat step S2B2, traverse the remaining calibration points in turn along the downstroke direction, and obtain the indications of the standard liquid level gauge (9) and the indications of the liquid level gauge to be calibrated corresponding to the remaining calibration points; S2B4: During the downstroke calibration process, the control module obtains the indication of the standard liquid level gauge (9) corresponding to each calibration point and the indication of the liquid level gauge to be calibrated, and determines the downstroke calibration result based on the indication of the standard liquid level gauge (9) corresponding to each calibration point and the indication of the liquid level gauge to be calibrated.

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