CN106481969B - Automatic calibration system and calibration method for LNG liquid adding machine - Google Patents
Automatic calibration system and calibration method for LNG liquid adding machine Download PDFInfo
- Publication number
- CN106481969B CN106481969B CN201510532024.6A CN201510532024A CN106481969B CN 106481969 B CN106481969 B CN 106481969B CN 201510532024 A CN201510532024 A CN 201510532024A CN 106481969 B CN106481969 B CN 106481969B
- Authority
- CN
- China
- Prior art keywords
- liquid adding
- adding machine
- calibration
- management device
- communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 242
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004891 communication Methods 0.000 claims abstract description 137
- 238000003860 storage Methods 0.000 claims abstract description 28
- 230000008569 process Effects 0.000 claims abstract description 23
- 238000012360 testing method Methods 0.000 claims description 27
- 238000012937 correction Methods 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 4
- 238000007726 management method Methods 0.000 description 78
- 239000007789 gas Substances 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000007689 inspection Methods 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 206010053615 Thermal burn Diseases 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000003442 weekly effect Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Landscapes
- Loading And Unloading Of Fuel Tanks Or Ships (AREA)
- Arrangements For Transmission Of Measured Signals (AREA)
Abstract
An automatic calibration system and a calibration method of an LNG liquid adding machine are disclosed: the system comprises an air source storage tank, a booster pump, a standard device, a liquid adding machine and a calibration management device; the outlet of the storage tank is connected with the inlet of the booster pump through a pipeline, the outlet of the booster pump is connected with the inlet of the standard device through a pipeline, the outlet of the standard device is connected with the inlet of the liquid adding machine through a pipeline, and the liquid adding gun of the liquid adding machine is connected with the liquid return port of the air source storage tank through a pipeline; the liquid adding machine communication interface is connected with the first interface of the calibration management device through a communication line, and the standard device communication interface is connected with the second interface of the calibration management device through a communication line; the calibration management device analyzes the data of the liquid adding machine and the standard device, dynamically detects and automatically corrects the error of the liquid adding machine through the calibration management device, and automatically forms and records the electronic record of the debugging process.
Description
Technical Field
The invention relates to a fuel gas filling technology, in particular to an LNG liquid filling machine automatic calibration system and a calibration method for carrying out intelligent calibration or factory inspection on an LNG liquid filling machine.
Background
The LNG liquid filling machine is used for filling LNG natural gas fuel into motor vehicles or energy storage containers and carrying out trade settlement, and the accuracy of gas filling metering is directly related to the fairness of transactions of both parties, so that the liquid filling machine needs to be strictly calibrated and subjected to factory inspection before production and delivery, and meets the precision requirement, and the liquid filling machine with unqualified precision is adjusted.
At present, the liquid adding machine is basically calibrated by a mass method.
The quality method is characterized in that a vehicle-mounted gas cylinder is used, a liquid adding machine is used for filling a measuring medium, and the measuring error of the LNG liquid adding machine is calculated by measuring the mass of the vehicle-mounted gas cylinder before and after the medium is filled. The method comprises the steps of firstly measuring the quality of the vehicle-mounted gas cylinder before filling by using a quality method, then precooling an LNG liquid adding machine, taking down a liquid adding gun full of a cryogenic measuring medium from the liquid adding machine after the metering condition is reached, connecting the liquid adding gun to the vehicle-mounted gas cylinder, filling the cryogenic medium into the vehicle-mounted gas cylinder, disconnecting the liquid adding gun from the vehicle-mounted gas cylinder after filling is completed, weighing the quality of the vehicle-mounted gas cylinder, and carrying out error calculation according to the quality difference before and after filling and the display screen display number of the liquid adding machine. The vehicle-mounted gas cylinder needs to diffuse cryogenic medium into the air before being used next time.
The use quality method for calibration and factory inspection has five defects,
after the liquid adding machine is precooled, when the liquid adding gun is taken out of the liquid adding machine, the liquid adding gun is connected with the vehicle-mounted gas cylinder and the liquid adding gun is taken down from the vehicle-mounted gas cylinder, part of measuring medium leaks into the air from the liquid adding gun head, so that the medium quality measured by the liquid adding machine is larger than the medium quality filled by the vehicle-mounted gas cylinder, and measuring errors are caused;
after the liquid medium is filled into the vehicle-mounted gas storage cylinder, the liquid is in a motion state, and the quality reading is displayed in a jumping mode, so that the reading is inaccurate, and errors are caused;
thirdly, in the filling engineering, the liquid filling gun is plugged and pulled for many times, data are recorded manually, manpower is consumed, measuring time is prolonged, and production efficiency is reduced;
fourthly, the measuring medium is cryogenic liquid, and the liquid adding gun is plugged and pulled for multiple times, so that the risk of cold scald is increased;
and fifthly, the measuring medium generally adopts liquid nitrogen, and after the vehicle-mounted gas storage cylinder is filled with the liquid nitrogen, the filling medium needs to be released to the air, so that the production cost is increased.
In the existing calibration operation technology of the liquid adding machine, the calibration can be truly and effectively carried out only by detecting under the real practical environment of the simulated LNG liquid adding machine; after the conveying line of the liquid medium for testing is changed, the pressure and the temperature of the liquid medium are possibly different from the actual operation state of the liquid filling machine, so that errors still exist in the actual operation of the liquid filling machine after compensation and correction.
The invention relates to a Chinese patent with application number of 200910103244.1 and the subject of self-diagnosis zero-adjustment gas dispenser, wherein a method for automatically detecting and correcting a zero drift value is provided, a computer of the gas dispenser and a device capable of detecting the zero point of a flow meter are utilized, and the detection and correction are carried out according to whether the flow meter is positioned at the zero point or not in a gas-free input state.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an automatic calibration system and a calibration method for an LNG liquid adding machine, which are used for carrying out intelligent calibration or factory inspection on the liquid adding machine.
In order to solve the technical problems, the technical scheme of the invention is as follows:
an automatic calibration system of an LNG liquid adding machine comprises a storage tank, a booster pump, a standard device, the liquid adding machine and a calibration management device; the storage tank is provided with an outlet and a liquid return port, the booster pump and the standard device are both provided with an inlet and an outlet, and the liquid adding machine is provided with an inlet and a liquid adding gun; the liquid adding machine is provided with a communication interface connected with a flow measuring device in the liquid adding machine; the standard is provided with a communication interface connected with a flow measuring device in the standard; the outlet of the storage tank is connected with the inlet of the booster pump through a pipeline, the outlet of the booster pump is connected with the inlet of the standard device through a pipeline, the outlet of the standard device is connected with the inlet of the liquid adding machine through a pipeline, and the liquid adding gun of the liquid adding machine is connected with the liquid return port of the storage tank through a pipeline;
the liquid adding machine communication interface is connected with the calibration management device through a communication line, and the standard device communication interface is connected with the calibration management device through a communication line; the calibration management device analyzes the measurement data of the liquid adding machine and the standard device, dynamically detects and automatically corrects the error of the liquid adding machine through the calibration management device, and automatically forms and records the electronic record of the debugging process.
In one embodiment, the calibration management device is a computer; the computer is at least provided with a first interface and a second interface, the liquid adding machine communication interface is connected with the first interface, and the standard machine communication interface is connected with the second interface.
In one embodiment, a protocol converter is connected in series to a communication line between the standard device and the calibration management device, and the protocol converter converts a signal received by the standard device into a computer serial signal.
In one embodiment, a protocol converter is connected in series with a communication line between the liquid adding machine and the calibration management device, and the protocol converter converts a signal output by the liquid adding machine into a computer serial port signal.
In one embodiment, the liquid filling device further comprises an information acquisition controller, one direction signal of which is connected with the liquid filling machine and the standard device, and the other direction signal of which is connected with the calibration management device; the information acquisition controller comprises a processor, a data driving circuit and a communication conversion circuit, wherein the data driving circuit and the communication conversion circuit are in signal connection with the processor; the processor receives flow data of the liquid adding machine or the standard device through the communication conversion circuit and transmits the flow data to the calibration management device through a data driving circuit; the processor receives a control instruction or an adjustment instruction of the calibration management device through the data driving circuit, and controls the starting and stopping of the liquid adding machine or the standard device or the compensation and correction of the flow measuring device through the communication conversion circuit.
In one embodiment, the communication conversion circuit at least comprises a first communication driving circuit, a second communication driving circuit, a first level matching circuit and a second level matching circuit; the first communication driving circuit, the second communication driving circuit, the first level matching circuit and the second level matching circuit are respectively in signal connection with the processor, and the first communication driving circuit and the second communication driving circuit are respectively in signal connection with the communication interface of the liquid adding machine or the standard device; the first level matching circuit and the second level matching circuit are in signal connection with a command input interface of the liquid adding machine or the standard device, and the processor respectively controls the liquid adding machine and the standard device to start or stop through the command input interface; the processor receives flow data of the liquid adding machine and the standard device through the first communication driving circuit and the second communication driving circuit respectively; and the processor controls the compensation correction of the liquid adding machine through the first communication driving circuit.
In one embodiment, the first communication driving circuit, the second communication driving circuit, the first level matching circuit and the second level matching circuit respectively have corresponding connection interfaces.
On the other hand, the embodiment of the invention provides a calibration method of an LNG liquid adding machine, which is applied to the automatic calibration system of the LNG liquid adding machine; the calibration basic operation method comprises the following steps:
starting the booster pump, wherein the liquid in the storage tank returns to the gas source storage tank through the standard device and the liquid adding machine through pipelines to form a closed loop;
the calibration management device automatically reads the parameters of the standard device and the flow measuring device in the liquid adding machine;
the calibration management device simultaneously reads the flow measured by the liquid adding machine and the standard device in real time;
the calibration management device performs error analysis on the read data and calculates a zero drift and a compensation coefficient;
and the calibration management device sends the zero drift parameters and/or the compensation coefficients to the liquid adding machine through a communication interface, and the liquid adding machine automatically performs compensation correction.
In one embodiment, the parameter measured by the flow measurement device comprises flow, fluid temperature, pressure and/or gain.
In one embodiment, after the compensation and correction of the liquid adding machine are completed, the following steps are sequentially executed:
the calibration management device simultaneously sends a metering starting command to the liquid adding machine and the standard device through the communication interface;
the calibration management device simultaneously reads the flow measured by the liquid adding machine and the standard device in real time;
the calibration management device automatically performs error analysis on the read data;
if the precision of the liquid adding machine meets the requirement, the calibration management device automatically forms a product metering error qualified report, the report is stored in the calibration management device, and the calibration process is completed;
if the precision of the liquid adding machine does not meet the requirement, the calibration management device simultaneously sends a metering stopping command to the liquid adding machine and the standard device;
and repeating the steps in the basic operation method, and if the adjustment cannot be completed for three times continuously, automatically forming a test report by the calibration management device, wherein the test report comprises data in the whole test process and is provided for technicians to analyze the problems of the liquid adding machine.
In the above embodiment, during calibration, the calibration management device sends a measurement start command to the liquid adding machine and the standard device through the communication interface simultaneously
The beneficial technical effects of the invention comprise:
the automatic calibration system for the LNG liquid adding machine provided by the embodiment of the invention can dynamically detect the error of the liquid adding machine, automatically correct the error of the liquid adding machine according to the detection result, automatically record the electronic record in the process of production and debugging, intelligently analyze data, generate a report and a curve, improve the production efficiency, reduce the risk of cold scald, avoid the diffusion of a measuring medium, reduce the production cost and have guiding significance for the analysis of product stability. The method can be used for the liquid filling machine calibration and delivery inspection processes in the production process.
Furthermore, the embodiment of the invention provides an information acquisition controller, which integrates signal conversion, data processing and input and output of electric signal instructions, improves the synchronism of controllable actions, can ensure the continuity and accuracy of information acquisition, synchronously records the control instructions and acquisition parameters, avoids deviation of time nodes, can greatly reduce the intensity of human work in the calibration process, and improves the control efficiency and accuracy compared with a calibration operation system manually controlled by unidirectional acquisition.
Drawings
Fig. 1 is a schematic structural diagram of an automatic calibration system of an LNG filling machine in a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an automatic calibration system of an LNG filling machine in a second embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an information acquisition controller according to a second embodiment of the present invention.
Description of reference numerals:
the device comprises a storage tank 1, a booster pump 2, a liquid adding machine 3, a liquid adding gun 31, a standard device 4, a calibration management device 5, a first pipeline 61, a second pipeline 62, a third pipeline 64, a fourth pipeline 64, a first communication line 71, a second communication line 72, a third communication line 73, a fourth communication line 74, an information acquisition controller 8, a processor 81, a data driving circuit 82, a communication conversion circuit 84, a first communication driving circuit 841, a first level matching circuit 842, a second communication driving circuit 843, a second level matching circuit 844, a first communication interface 845, a first command port 846, a second communication interface 847 and a second command port 848.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below. It is to be understood that the invention is capable of other and different embodiments and its several details are capable of modification without departing from the scope of the invention, and that the description and drawings are to be regarded as illustrative in nature and not as restrictive.
The first embodiment of the invention provides an automatic calibration system of an LNG liquid filling machine, which at least comprises a storage tank 1 of an air source, a booster pump 2, a liquid filling machine 3, a standard device 4 and a calibration management device 5, as shown in FIG. 1.
The liquid medium carrier can here be a tank 1 and the test medium can be liquid nitrogen. The outlet of the storage tank 1 is connected and communicated with the inlet of the booster pump 2 through a first pipeline 61, the outlet of the booster pump 2 is connected and communicated with the inlet of the standard device 4 through a second pipeline 62, the outlet of the standard device 4 is connected and communicated with the inlet of the liquid adding machine 3 through a fourth pipeline, the liquid adding gun 31 of the liquid adding machine 3 can be connected with the large circulation inlet of the liquid adding machine 3, and the large circulation outlet is connected and communicated with the liquid return port of the air source storage tank 1 through a third pipeline 63. The large circulation inlet can be a section of pipe built into the charger 3, having an inlet and an outlet. Of course, the liquid adding gun 31 can be directly communicated to the liquid return port of the gas source storage tank 1 through the third pipeline 63.
The structure is connected to form a testing pipeline system with a testing medium capable of continuously circulating, the liquid adding machine 3 to be tested is connected with the standard device 4 in series, the measuring precision of the standard device 4 is higher, the parameter of the standard device 4 is used as the target parameter of the liquid adding machine 3 to be tested, and the standard device 4 can be composed of a mass flowmeter with the precision of more than 0.2% and a control system.
The liquid adding machine 3 and the standard device 4 are respectively provided with a control system, the control system can be a built-in computer system or a single chip microcomputer or a PLC, a calibration mode and an operation mode are generally provided for selection, and the liquid adding machine 3 can be controlled to perform error compensation in the calibration mode. The control systems of the charger 3 and the standard 4 furthermore have signal input and output interfaces for connection to a cash or management system in the station, where these interfaces are used for connection to a calibration manager. The communication interface of the liquid adding machine 3 is connected with the communication interface of the calibration management device 5 through a first communication line 71, and the communication interface of the standard device 4 is connected with the communication interface of the calibration management device 5 through a second communication line 72.
The calibration management device 5 is provided with input equipment, output equipment, a data processor, a memory and a communication module, the data processor can be used for comparing the metering parameters of the liquid adding machine 3 and the standard device 4 in real time, and the comparison result is recorded and stored and can be output. At the same time, the memory can store the database for execution, the database defines the corresponding operation instruction under the appointed comparison result, and the processor can execute the corresponding instruction operation according to the operation instruction. Therefore, the calibration management device 5 can analyze the data of the liquid adding machine 3 and the standard device 4, dynamically detect and automatically correct the error of the liquid adding machine 3 through the calibration management device 5, and automatically form and record the electronic record of the debugging process.
The calibration management device 5 may be a computer; the computer can be provided with at least two serial interfaces, namely a first interface and a second interface for connecting the liquid adding machine 3 and the standard device 4. A protocol converter can be connected in series on a communication line between the standard device 4 and the calibration management device 5, and the protocol converter converts signals received by the standard device 4 into computer serial port signals. A protocol converter is connected in series on a communication line between the liquid adding machine 3 and the calibration management device 5, and the protocol converter converts signals output by the liquid adding machine 3 into computer serial port signals.
Protocol converter, also called interface converter, is called protocol converter for short, and can make the hosts adopting different high-level protocols in communication network still cooperate with each other to implement various distributed applications. It operates at the transport layer or higher. The interface protocol converter can be completed by using an ASIC chip generally, and has low cost and small volume. It can convert the Ethernet or V.35 data interface of IEEE802.3 protocol and the 2M interface of standard G.703 protocol. Or the conversion CAN be carried out on 232/485/422 serial ports, E1 interfaces, CAN interfaces and 2M interfaces.
Referring to fig. 1, an embodiment of a calibration method of an automatic calibration system of an LNG liquid feeder according to a first embodiment of the present invention may include the following steps:
1. reliably connecting pipelines among all parts of the system;
2. the calibration management device 5 is reliably connected with a communication line between the liquid adding machine 3 and the standard device 4;
3. switching a setting button of a circuit main board of the liquid adding machine 3 to a calibration state;
4. opening valves in the connecting pipelines;
5. starting the booster pump 2, and enabling liquid nitrogen in the storage tank 1 to return to the storage tank 1 through the first pipeline 61, the booster pump 2, the second pipeline 62, the standard device 4, the fourth pipeline 64, the liquid adding machine 3 and the third pipeline 63 to form a closed loop;
6. the calibration management device 5 automatically reads flow meter parameters in the standard device 4 and the liquid adding machine 3, wherein the flow meter parameters can comprise flow, liquid temperature, pressure, gain and the like;
7. the calibration management device 5 analyzes the read parameters, and the flowmeter reaches the metering condition;
8. wherein, the calibration management device 5 simultaneously sends a metering starting command to the liquid adding machine 3 and the standard device 4 through a communication line;
9. the calibration management device 5 simultaneously reads the mass flow measured by the liquid adding machine 3 and the standard device 4 in real time;
10. the calibration management device 5 automatically performs error analysis on the read data, and calculates a zero drift and a compensation coefficient according to a database prestored in the calibration management device 5;
11. the calibration management device 5 simultaneously sends a metering stopping command to the liquid adding machine 3 and the standard device 4;
12. the calibration management device 5 sends the zero drift parameters and the compensation coefficients to the liquid adding machine 3 through a communication line, and the liquid adding machine 3 automatically performs compensation correction;
13. after the compensation and correction of the liquid adding machine 3 are finished, sequentially executing the steps 8 and 9;
14. the calibration management device 5 automatically performs error analysis on the read data;
15. if the precision of the liquid adding machine 3 meets the factory requirements, the calibration management device 5 automatically forms a product metering error qualified report, the report is stored in the calibration management device 5, and the calibration process is completed. Then, a circuit main board of the liquid adding machine 3 is provided with a button to be switched to an operating state;
16. if the precision does not meet the requirement, the calibration management device 5 simultaneously sends a metering stopping command to the liquid adding machine 3 and the standard device 4;
17. and (5) repeating the steps of 8-15, if the adjustment cannot be completed for three times, automatically forming a test report by the calibration management device 5, wherein the report comprises data in the whole test process and is provided for technicians to analyze the problems of the liquid adding machine 3.
18. The test report in the calibration management device 5 can be inquired according to time, operators and product serial numbers and can be printed at any time;
19. the calibration management device 5 counts the number of the test liquid adding machines 3, and calculates the one-time automatic checking pass rate of the product and the pass rate after parameter compensation correction, so that the quality of the product can be controlled by managers.
20. The calibration management device 5 forms a daily report, a weekly report, a monthly report, and an annual report for the test process, and forms a quality stability curve.
The automatic calibration system provided in the embodiment is used for conveying the liquid medium for testing in a closed loop circuit, and taking a high-precision standard device as a reference to be compared with the liquid adding machine to be tested in series.
Furthermore, the calibration management device can perform comparison and difference calculation after completing data acquisition, can perform corresponding compensation correction operation by using a calculation result, and can directly transmit an instruction to perform automatic compensation correction on the liquid adding machine through a communication line. The calibration system can not only carry out testing, but also process the testing result and carry out compensation and correction operation according to the result. All the steps are automatically executed, so that errors and accidents caused by manual operation and continuous operation in the prior art can be reduced. Because parameters such as liquid temperature, pressure, gain and the like of the standard device and the liquid filling machine can be simultaneously acquired and controlled in the calibration operation, even if the conveying line of the liquid medium for testing is different from the actual using environment, the corrected liquid filling machine has no error in the actual operation.
As shown in fig. 2 and fig. 3, a second embodiment of the present invention provides an automatic calibration system for an LNG liquid filling machine, which is different from the first embodiment in that it further includes an information acquisition controller 8, one direction signal of which is connected to the liquid filling machine 3 and the standard device 4, and the other direction signal of which is connected to the calibration management device 5.
The liquid medium carrier can here be a tank 1 and the test medium can be liquid nitrogen. The outlet of the storage tank 1 is connected and communicated with the inlet of the booster pump 2 through a first pipeline 61, the outlet of the booster pump 2 is connected and communicated with the inlet of the standard device 4 through a second pipeline 62, the outlet of the standard device 4 is connected and communicated with the inlet of the liquid adding machine 3 through a fourth pipeline, the liquid adding gun of the liquid adding machine 3 can be connected with the large circulation inlet of the liquid adding machine 3, and the large circulation outlet is connected and communicated with the liquid return port of the air source storage tank 1 through a third pipeline 63.
The structure is connected to form a testing pipeline system with a testing medium capable of continuously circulating, the liquid adding machine 3 to be tested is connected with the standard device 4 in series, the measuring precision of the standard device 4 is higher, the parameter of the standard device 4 is used as the target parameter of the liquid adding machine 3 to be tested, and the standard device 4 can be composed of a mass flowmeter with the precision of more than 0.2% and a control system.
The liquid adding machine 3 and the standard device 4 are respectively provided with a control system, the control system can be a built-in computer system or a single chip microcomputer or a PLC, a calibration mode and an operation mode are generally provided for selection, and the liquid adding machine 3 can be controlled to perform error compensation in the calibration mode. The control systems of the charger 3 and the standard 4 furthermore have signal input and output interfaces for connection to a cash or management system in the station, where these interfaces are used for connection to a calibration manager. The communication interface of the liquid adding machine 3 is connected with the communication interface of the information acquisition controller 8 through a first communication line 71, and the communication interface of the standard machine 4 is connected with the communication interface of the information acquisition controller 8 through a second communication line 72.
The information acquisition controller 8 uses another communication interface to communicate data with the calibration management device 5, and the data communication mode may be a wired connection or a wireless communication mode. The calibration management device 5 analyzes the data of the liquid adding machine 3 and the standard device 4 through the information acquisition controller 8, can dynamically detect and automatically correct the error of the liquid adding machine 3 through the information acquisition controller 8, and automatically forms and records the electronic record of the debugging process. Meanwhile, the information acquisition controller 8 is also connected with the liquid adding machine 3 and the standard device 4 through a third communication line 73 and a fourth communication line 74 respectively so as to send electric control commands of starting, standby and stopping to the liquid adding machine 3 and the standard device 4.
The calibration management device 5 may be a computer; the computer may have at least a wired or wireless communication interface for information connection with the information acquisition controller 8.
As shown in fig. 3, the information acquisition controller 8 may include a processor 81, a data driving circuit 82 and a communication conversion circuit 83, wherein the data driving circuit 82 and the communication conversion circuit 83 are connected to the processor 81 by signals. The processor 81 is a main control Unit, and the processor 81 may be a Micro Controller Unit (MCU). The processor 81 can receive the reference data of the liquid adding machine 3 and the standard device 4, transmit the processed reference data to an upper computer (the calibration management device 5), process the received upper computer instruction into an electric signal instruction and send the electric signal instruction to the liquid adding machine 3 and the standard device 4. The processor 81 receives the flow data of the liquid adding machine or the standard machine through the communication conversion circuit 83 and transmits the flow data to the calibration management device 5 through the data driving circuit 82; the processor 81 receives the control command or the adjustment command of the calibration management device 5 through the data driving circuit 82, and controls the start-up and the stop of the liquid filling machine 3 or the standard device 4 or the compensation and the correction of the flow measuring device through the communication conversion circuit 83.
The communication conversion circuit 83 includes at least a first communication driving circuit 841, a second communication driving circuit 843, a first level matching circuit 842, and a second level matching circuit. The first communication driving circuit 841, the second communication driving circuit 843, the first level matching circuit 842 and the second level matching circuit 844 are respectively in signal connection with the processor 81; the first communication driving circuit 841 and the second communication driving circuit 843 are respectively connected to the communication interface of the liquid filling machine 3 or the standard machine 4 through the first communication line 71 and the second communication line 72. The first level matching circuit 842 and the second level matching circuit 844 are respectively in signal connection with the command input interface of the liquid adding machine 3 or the standard machine 4 through a third communication line 73 and a fourth communication line 74. The processor 81 respectively controls the liquid adding machine 3 and the standard machine 4 to start or stop through a command input interface; the processor 81 receives the flow data of the liquid adding machine 3 and the standard machine 4 through the first communication drive circuit 841 and the second communication drive circuit 843 respectively; the processor 81 controls the compensation correction of the liquid filling machine through the first communication driving circuit 841 or the second communication driving circuit 843.
In the embodiment, the first communication driving circuit 841 is connected to a first communication interface 845 inside or outside, and the first communication interface 845 is connected to a communication interface for parameter output of the liquid adding machine 3. The second communication driving circuit 843 is connected to a second communication interface 847, and the second communication interface 847 is connected to the communication interface for parameter output of the standard 4. The first level matching circuit 842 is connected with a first command port 846 inside or outside, and the first command port 846 is connected with the instruction input interface of the liquid adding machine 3. The second level matching circuit 844 has a second command port 848 built-in or connected thereto, and the second command port 848 is connected to the command input interface of the standard 4. The data driving circuit 82 is connected to or embedded in a third communication interface 821, and the third communication interface 821 is connected to the calibration management device 5 through the third communication interface 821, wherein the third communication interface 821 can be a wired interface or a wireless transmission module.
Referring to fig. 2 and 3, a specific implementation manner of the automatic calibration system of the LNG liquid adding machine in the second embodiment of the present invention may include the following steps:
1. reliably connecting pipelines of all parts in the calibration system;
2. reliably connecting a calibration management device 5, an information acquisition controller 8, a liquid adding machine 3 and a standard device 4 with a communication and control circuit;
3. switching a circuit main board setting button of the liquid adding machine 3 to a calibration state;
4. opening valves in the connecting pipelines;
5. starting the booster pump 2, and returning liquid nitrogen in the storage tank 1 to the storage tank 1 through the pipeline, the standard device 4 and the liquid adding machine 3 to form a closed loop;
6. the calibration management device 5 issues a flow meter parameter reading command to the information acquisition controller 8 through a communication interface;
7. after receiving the command of the calibration management device 5, the information acquisition controller 8 automatically reads the flow meter parameters including flow, liquid temperature, pressure and gain in the standard device 4 and the liquid adding machine 3;
8. the information acquisition controller 8 automatically reads the parameters of the flow meter in the standard device 4 and the liquid adding machine 3 and automatically transmits the parameters to the calibration management device 5;
9. the calibration management device 5 analyzes the read parameters, if the flow meter reaches the metering condition, the step 10 is performed, and if the flow meter does not reach the metering condition, the steps 6, 7 and 8 are repeated.
10. The calibration management device 5 sends a metering starting command to the information acquisition controller 8 through a communication interface;
11. the information acquisition controller 8 simultaneously sends a metering starting preparation command to the liquid adding machine 3 and the standard device 4 through the communication interface;
12. the liquid adding machine 3 and the standard device 4 return the information of the completion of the starting preparation of the flowmeter to the information acquisition controller 8;
13. the information acquisition controller 8 sends an acquisition command to the liquid adding machine 3 and the standard device 4 simultaneously in a level signal mode through the command port, and the liquid adding machine 3 and the standard device 4 enter a metering state;
14. the information acquisition controller 8 simultaneously reads the mass flow measured by the liquid adding machine 3 and the standard counter in real time and automatically sends the read data to the calibration management device 5;
15. the calibration management device 5 automatically performs error analysis on the read data and calculates a zero drift and a compensation coefficient;
16. the calibration management device 5 sends a metering stop command to the information acquisition controller 8; (ii) a
17. The information acquisition controller 8 sends an acquisition ending command to the liquid adding machine 3 and the standard device 4 in a level signal mode through a command port, and the liquid adding machine 3 and the standard device 4 enter a standby state;
18. the calibration management device 5 sends the zero drift parameter and the compensation coefficient to the information acquisition controller 8 through the communication interface, and then the information acquisition controller 8 sends the zero drift parameter and the compensation coefficient to the liquid adding machine 3 through the communication interface, and the liquid adding machine 3 automatically performs compensation correction;
19. after the compensation and correction of the liquid adding machine 3 are finished, 6-18 steps are sequentially executed;
20. the calibration management device 5 automatically performs error analysis on the read data;
21. if the precision of the liquid adding machine 3 meets the factory requirements, the calibration management device 5 automatically forms a product metering error qualified report, the report is stored in the calibration management device 5, and the calibration process is completed. Then, a circuit main board of the liquid adding machine 3 is provided with a button to be switched to an operating state;
22. if the precision does not meet the requirement, repeating the steps 6-21, and if the adjustment cannot be completed for three times continuously, automatically forming a test report by the calibration management device 5, wherein the report comprises data in the whole test process and is provided for technicians to analyze the problems of the liquid adding machine 3.
23. The test report in the calibration management device 5 can be inquired according to time, operators and product serial numbers and can be printed at any time;
24. the calibration management device 5 counts 3 or more than 3 liquid adding machines for testing, and calculates the one-time automatic checking pass rate of the product and the pass rate after parameter compensation and correction for the quality control of managers.
25. The calibration management device 5 forms a daily report, a weekly report, a monthly report, and an annual report for the test process, and forms a quality stability curve.
The automatic calibration system for the LNG liquid adding machine provided by the embodiment of the invention can dynamically detect the error of the liquid adding machine, automatically correct the error of the liquid adding machine according to the detection result, automatically record the electronic record in the process of production and debugging, intelligently analyze data, generate a report and a curve, improve the production efficiency, reduce the risk of cold scald, avoid the diffusion of a measuring medium, reduce the production cost and have guiding significance for the analysis of product stability. The method can be used for the liquid filling machine calibration and delivery inspection processes in the production process.
Furthermore, the embodiment of the invention provides an information acquisition controller, which integrates signal conversion, data processing and input and output of electric signal instructions, improves the synchronism of controllable actions, can ensure the continuity and accuracy of information acquisition, synchronously records the control instructions and acquisition parameters, avoids deviation of time nodes, can greatly reduce the intensity of human work in the calibration process, and improves the control efficiency and accuracy compared with a calibration operation system manually controlled by unidirectional acquisition.
Unless otherwise defined, all terms used herein have the meanings commonly understood by those skilled in the art. The described embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of the present invention, and those skilled in the art may make various other substitutions, alterations, and modifications within the scope of the present invention, and thus, the present invention is not limited to the above-described embodiments but only by the claims.
Claims (11)
1. An automatic calibration system of an LNG liquid adding machine is characterized by comprising a storage tank, a booster pump, a standard device, a liquid adding machine and a calibration management device;
the storage tank is provided with an outlet and a liquid return port, the booster pump and the standard device are both provided with an inlet and an outlet, and the liquid adding machine is provided with an inlet and a liquid adding gun; the liquid adding machine is provided with a communication interface connected with a flow measuring device in the liquid adding machine; the standard is provided with a communication interface connected with a flow measuring device in the standard;
the outlet of the storage tank is connected with the inlet of the booster pump through a pipeline, the outlet of the booster pump is connected with the inlet of the standard device through a pipeline, the outlet of the standard device is connected with the inlet of the liquid adding machine through a pipeline, and the liquid adding gun of the liquid adding machine is connected with the liquid return port of the storage tank through a pipeline;
the liquid adding machine communication interface is connected with the calibration management device through a communication line, and the standard device communication interface is connected with the calibration management device through a communication line;
the calibration management device analyzes the measurement data of the liquid adding machine and the standard device, dynamically detects and automatically corrects the error of the liquid adding machine through the calibration management device, and automatically forms and records the electronic record of the debugging process.
2. The LNG filling machine automatic calibration system of claim 1, wherein the calibration management device is a computer; the computer is at least provided with a first interface and a second interface, the liquid adding machine communication interface is connected with the first interface, and the standard machine communication interface is connected with the second interface.
3. The LNG liquid adding machine automatic calibration system as claimed in claim 2, wherein a protocol converter is connected in series to a communication line between the standard device and the calibration management device, and the protocol converter converts a signal received by the standard device into a computer serial signal.
4. The LNG liquid adding machine automatic calibration system of claim 2, characterized in that a protocol converter is connected in series to a communication line between the liquid adding machine and the calibration management device, and the protocol converter converts a signal received by the liquid adding machine into a computer serial signal.
5. The LNG liquid adding machine automatic calibration system of claim 1, further comprising an information acquisition controller, one direction signal of which is connected to the liquid adding machine and the standard device, and the other direction signal of which is connected to the calibration management device;
the information acquisition controller comprises a processor, a data driving circuit and a communication conversion circuit, wherein the data driving circuit and the communication conversion circuit are in signal connection with the processor; the processor receives flow data or other data information of the liquid adding machine or the standard device through the communication conversion circuit and transmits the flow data or other data information to the calibration management device through the data driving circuit; the processor receives a control instruction of the calibration management device through the data driving circuit, and controls the starting and stopping of the liquid adding machine or the standard device or the compensation correction of the flow measuring device through the communication conversion circuit.
6. The LNG liquid adding machine automatic calibration system of claim 5, wherein the communication conversion circuit at least comprises a first communication driving circuit, a second communication driving circuit, a first level matching circuit and a second level matching circuit; the first communication driving circuit, the second communication driving circuit, the first level matching circuit and the second level matching circuit are respectively in signal connection with the processor, and the first communication driving circuit and the second communication driving circuit are respectively in signal connection with the communication interface of the liquid adding machine or the standard device; the first level matching circuit and the second level matching circuit are in signal connection with a command input interface of the liquid adding machine or the standard device, and the processor respectively controls the liquid adding machine and the standard device to start or stop through the command input interface; the processor receives flow data or other data information of the liquid adding machine and the standard device through the first communication driving circuit and the second communication driving circuit respectively; and the processor controls the compensation correction of the liquid adding machine through the first communication driving circuit.
7. The LNG liquid adding machine automatic calibration system of claim 6, wherein the first communication driving circuit, the second communication driving circuit, the first level matching circuit and the second level matching circuit are respectively provided with corresponding connection interfaces.
8. An LNG filling machine calibration method, which applies the LNG filling machine automatic calibration system of any one of claims 1 to 7; the calibration method comprises the following steps:
starting the booster pump, wherein the liquid in the storage tank returns to the storage tank through the standard device and the liquid adding machine through pipelines to form a closed loop;
the calibration management device automatically reads the parameters of the standard device and the flow measuring device in the liquid adding machine;
the calibration management device simultaneously reads the flow measured by the liquid adding machine and the standard device in real time;
the calibration management device performs error analysis on the read data and calculates a zero drift and a compensation coefficient;
and the calibration management device sends the zero drift parameters and/or the compensation coefficients to the liquid adding machine through a communication interface, and the liquid adding machine automatically performs compensation correction.
9. Calibration method according to claim 8, wherein the parameters measured by the flow measuring device comprise flow, liquid temperature, pressure and/or gain.
10. The calibration method according to claim 8 or 9, wherein after the compensation correction of the liquid filling machine is completed, the following steps are continuously performed:
the calibration management device simultaneously sends a metering starting command to the liquid adding machine and the standard device through the communication interface;
the calibration management device simultaneously reads the flow measured by the liquid adding machine and the standard device in real time;
the calibration management device automatically performs error analysis on the read data;
if the precision of the liquid adding machine meets the requirement, the calibration management device automatically forms a product metering error qualified report, the report is stored in the calibration management device, and the calibration process is completed;
if the precision of the liquid adding machine does not meet the requirement, the calibration management device simultaneously sends a metering stopping command to the liquid adding machine and the standard device;
repeating the steps of claim 8, if the adjustment cannot be completed for three times, automatically forming a test report by the calibration management device, wherein the test report comprises data in the whole test process and provides technicians with the data to analyze the problems of the liquid adding machine.
11. A calibration method according to claim 8 or 9, wherein during calibration, the calibration management device sends a metering start command to the liquid filling machine and the standard simultaneously via the communication interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510532024.6A CN106481969B (en) | 2015-08-26 | 2015-08-26 | Automatic calibration system and calibration method for LNG liquid adding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510532024.6A CN106481969B (en) | 2015-08-26 | 2015-08-26 | Automatic calibration system and calibration method for LNG liquid adding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106481969A CN106481969A (en) | 2017-03-08 |
| CN106481969B true CN106481969B (en) | 2020-02-04 |
Family
ID=58234470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510532024.6A Active CN106481969B (en) | 2015-08-26 | 2015-08-26 | Automatic calibration system and calibration method for LNG liquid adding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106481969B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110942614B (en) * | 2019-12-07 | 2021-04-27 | 重庆耐德能源装备集成有限公司 | Self-adaptive communication method of electronic meter controller and flowmeter of natural gas dispenser |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5970786A (en) * | 1997-09-25 | 1999-10-26 | Smith; Robert S. | Method for measuring compressed natural gas |
| CN101504111B (en) * | 2009-02-24 | 2010-09-08 | 重庆四联油气设备制造有限公司 | Self-diagnosis zeroing gas feeder |
| CN102128666B (en) * | 2011-02-11 | 2012-08-08 | 合肥工业大学 | Method for calibrating Coriolis mass flowmeter |
| CN102768529B (en) * | 2012-08-06 | 2014-08-13 | 北京雪迪龙科技股份有限公司 | Volume flow correction method for mass flow controller |
-
2015
- 2015-08-26 CN CN201510532024.6A patent/CN106481969B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106481969A (en) | 2017-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204346638U (en) | A kind of pressure calibration/calibrating installation | |
| CN105526998A (en) | Communication-based electronic gas meter detection device and method | |
| CN103499373A (en) | Automobile oil tank truck capacity automatic inspection device with self-calibration function and inspection method | |
| CN102401235A (en) | LNG (Liquefied Natural Gas) dispenser calibrating device | |
| CN102854485A (en) | Automated adjustment system for comprehensive multi-parameter electrical measuring instrument and adjustment method | |
| CN103791985A (en) | Static state standard cubic meter calibration device and calibration method of static state standard cubic meter calibration device | |
| CN103968919A (en) | Equipment and method for metering and automatically calibrating electronic water meter in production process | |
| CN102967348A (en) | Full-flow-point rapid detection device for water meter | |
| CN106481969B (en) | Automatic calibration system and calibration method for LNG liquid adding machine | |
| CN107144809A (en) | A kind of portable system and method for being used to carry out digitalized electrical energy meter live on-line testing | |
| CN109374287B (en) | Hydraulic retarder control valve detection system and method | |
| CN214668982U (en) | Full-automatic verification quality control device of online monitoring instrument | |
| CN103199946B (en) | Sensitivity index testing method of radio frequency receiver | |
| CN105717557B (en) | Rain sensor Intelligent Measurement controls terminal and its implementation | |
| CN111751048A (en) | Pressure sensor online checking device and method matched with digital instrument | |
| CN208805264U (en) | Electronics soap-film flow automatic calibrator | |
| CN110988785A (en) | Remote online calibration method for digital quantity input type electric energy meter | |
| CN108955839B (en) | Automatic flow calibrating device for electronic soap film | |
| CN116007717A (en) | Metering verification system and method for flowmeter for aviation fuel | |
| CN215004083U (en) | Static pressure characteristic testing device of differential pressure transmitter | |
| CN203534660U (en) | Self-calibrated automatic volume calibrating device for oil tank truck | |
| CN114371439A (en) | On-site calibration method applied to intelligent electric energy meter | |
| CN109084868B (en) | System and method for calibrating automobile fuel consumption detector by carbon balance method | |
| CN110398277B (en) | Aviation kerosene fuelling vehicle verification method and system | |
| CN109589475A (en) | The accuracy automatic checkout system and method for infusion equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |