CN103499373B - Be with self-alignment automatic capacity calibration device for tank truck and method - Google Patents
Be with self-alignment automatic capacity calibration device for tank truck and method Download PDFInfo
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Abstract
The present invention relates to the self-alignment automatic capacity calibration device for tank truck of a kind of band and calibration method.The present invention includes water pump, buffer tank, variable valve, the first switch valve, second switch valve, the 3rd switch valve, the first standard scale, the second standard scale, the 3rd standard scale, piston type standard volume pipe, the 4th switch valve, the 5th switch valve, the 6th switch valve and circulating water pool, and comprise fluid level transmitter and the temperature transmitter of automobile oil truck.Present invention achieves the automatic reading of signal and the automatic process of data, the storage of capacity verification result and the printings of form such as flow, liquid level, temperature.The present invention can carry out self calibration to proving flowmeter, ensure that transmission of quantity value accurately and reliably.Verification process realizes robotization, reduces personal error, improves the accuracy of calibrating efficiency and device.
Description
Technical field
The invention belongs to test technique automatic field, relate to the self-alignment automatic capacity calibration device for tank truck of a kind of band and calibration method.
Background technology
Automobile oil truck is the special car of transport liquid petroleum and chemical industry product etc., is the important tool of shipment lightweight oil.Oil tank after calibrating can be used as measurement instrument for oil product transaction, trade settlement, belongs to the record utensil project of state compulsion calibrating.In recent years, along with the outburst of energy crisis, rising steadily of crude oil price, the accurate measurement of automobile oil truck capacity also result in the general concern of people and attention.According to JJG133-2005 " automobile oil truck capacity vertification regulation ", there are capacity relative method and flowmeter method to the method for automobile oil truck capacity calibrating.Wherein capacity relative method adopts the volume of standard capacity measure to automobile oil truck to compare measurement, thus draws the volume of tank wagon.And flowmeter method adopts fixed point use to be that repetition rate is not less than the flowmeter of 0.05% as standard scale, by calculating the integrated flux by standard scale, thus determine the volume of tank wagon.
From existing automobile oil truck capacity calibrating installation, capacity relative method and flowmeter method have use.But volume ratio comparatively fado adopts manual operation, workload is large, inefficiency, and the existence of human factor also makes the reliability of verification result be difficult to ensure.Flowmeter method, as the high efficiency calibration method of one, in the tank wagon calibrating of reality, improves work efficiency, reduces labour intensity.
Mainly there is following problem in existing flowmeter method automobile oil truck capacity calibrating installation:
1. examine and determine efficiency not high: owing to adopting a flowmeter as standard scale, when standard scale fixed point uses, discharge is not often very large, and the time of water filling is longer, makes the efficiency of examining and determine not be very high.
2. the correctness of standard scale not easily finds: standard scale in use, when it goes wrong, owing to there is not checking mechanism, cannot find standard scale Problems existing timely, causes verification result to there is the risk of mistake.
3. the maintenance of standard scale is loaded down with trivial details: according to vertification regulation, needs to carry out regular calibrating to standard scale, and dismounting and the censorship of standard scale are cumbersome, the progress of the production calibrating that impact is actual and benefit.
4. labour intensity is large: artificial to discharge water, reading, and labour intensity is larger, and easily introduces personal error.
Summary of the invention
The present invention is directed to the technical deficiency of existing apparatus, provide the self-alignment automatic capacity calibration device for tank truck of a kind of band and calibration method.
Be with self-alignment automatic capacity calibration device for tank truck, comprise water pump, buffer tank, variable valve, the first switch valve, second switch valve, the 3rd switch valve, the first standard scale, the second standard scale, the 3rd standard scale, piston type standard volume pipe, the 4th switch valve, the 5th switch valve, the 6th switch valve and circulating water pool, and fluid level transmitter in automobile oil truck and temperature transmitter.
Water pump is communicated with circulating water pool by pipeline, water delivery side of pump is connected with the entrance of buffer tank, the outlet of buffer tank is connected with the entrance of variable valve, the entrance that pipeline is measured in outlet and the calibrating of variable valve is connected, the outlet that pipeline is measured in calibrating has two branch roads, one tunnel is standard scale calibration branch road, and another branch road is connected with tank wagon by the 6th switch valve successively, is also provided with fluid level transmitter and temperature transmitter in described tank wagon.
Described calibrating measuring tube route first switch valve, second switch valve, the 3rd switch valve, the first standard scale, the second standard scale and the 3rd standard scale composition, the entrance of the first switch valve and second switch valve is interconnected, and forms the entrance that pipeline is measured in calibrating.The outlet of the first switch valve is connected with the entrance of the first standard scale, and the outlet of second switch valve is connected with the entrance of the second standard scale and the 3rd standard scale, and the first standard scale is connected with the entrance of the 3rd switch valve with the outlet of the second standard scale.The outlet of the 3rd switch valve is connected with the outlet of the 3rd standard scale, forms the outlet that pipeline is measured in calibrating.
Described standard scale calibration branch road is disposed with the 4th switch valve, piston type standard volume pipe, the 5th switch valve.The outlet that pipeline is measured in entrance and the calibrating of the 4th switch valve is connected, the outlet of the 4th switch valve is connected with the entrance of piston type standard volume pipe, the outlet of piston type standard volume pipe is connected with the entrance of the 5th switch valve, and the outlet of the 5th switch valve is connected with circulating water pool.
The self-alignment automatic capacity calibration device for tank truck of above-mentioned band is utilized to carry out the method for examining and determine:
After starting water pump, the liquid in circulating water pool obtains the fluid of steady pressure after buffer tank; By PLC regulating and controlling valve opening to obtain suitable flow; The opening and closing of the first switch valve, second switch valve and the 3rd switch valve are controlled by PLC, can make the first standard scale, the second standard scale and the 3rd standard scale with single only, two parallel connections, three parallel connections or three series connection modes access calibrating and measure in pipeline and use, wherein adopt can the flowmeter of forward and reverse measurement for the second standard scale; Temperature transmitter, fluid level transmitter gather in road tanker and examine and determine required data.The standard scale situation specifically selected is, when the first switch valve is opened, second switch valve and the 3rd switch valve are closed, and the series connection of the first standard scale, the second standard scale and the 3rd standard scale uses; When the first switch valve, second switch valve and the 3rd switch valve are all opened, the parallel connection of the first standard scale, the second standard scale and the 3rd standard scale uses; When the first switch valve and the 3rd switch valve are opened, second switch valve cuts out, and only uses the first standard scale; When the first switch valve closedown, second switch valve and the 3rd switch valve are opened, the second standard scale and the parallel connection of the 3rd standard scale use.
The self-alignment automatic capacity calibration device for tank truck of above-mentioned band is utilized to carry out the method for standard scale calibration:
Control the first switch valve by PLC to open, second switch valve and the 3rd switch valve are closed, the first standard scale, the second standard scale and the 3rd standard scale is made to be in series connection, control the 6th switch valve cuts out by PLC, liquid flows into piston type standard volume pipe by the 4th switch valve, thus calibrates standard scale.After having examined and determine, the liquid in piston type standard volume pipe flows into circulating water pool by the 5th switch valve.
The present invention can carry out self calibration to proving flowmeter, ensure that transmission of quantity value accurately and reliably.Verification process realizes robotization, reduces personal error, improves the accuracy of calibrating efficiency and device.
Accompanying drawing explanation
Fig. 1 is apparatus structure schematic diagram in the present invention.
Fig. 2 is each power unit connection diagram in the present invention.
Fig. 3 is calibration function process flow diagram of the present invention.
In Fig. 1: 1, water pump, 2, buffer tank, 3, variable valve, 4-1, the first switch valve, 4-2, second switch valve, 4-3, the 3rd switch valve, 5-1, the first standard scale, 5-2, the second standard scale, 5-3, the 3rd standard scale, 6, piston type standard volume pipe, 7-1, the 4th switch valve, 7-2, the 5th switch valve, 8, the 6th switch valve, 9, tested road tanker, 10, fluid level transmitter, 11, temperature transmitter, 12, circulating water pool.
Embodiment
As shown in Figure 1, water pump 1 is drawn water from circulating water pool 12 by pipeline, and liquid obtained the liquid of pressure stability after entering buffer tank 2.According to the needs measured, by the aperture of PLC regulating and controlling valve 3, obtain suitable uninterrupted.When this system is in the calibrating stage of reading road tanker, PLC controls the 4th switch valve 7-1 closedown, the 6th switch valve 8 is opened.In verification process, when required flow is less, the first switch valve 4-1 is controlled and the 3rd switch valve 4-3 opens by PLC, second switch valve 4-2 closes, and at this moment only uses the first standard scale 5-1, also can control the first switch valve 4-1 and open, second switch valve 4-2 and the 3rd switch valve 4-3 closes, first standard scale 5-1, the second standard scale 5-2 and the 3rd standard scale 5-3 are connected use, at this moment also there is between three standard scales the effect of comparison, improve the confidence level of measurement data; When required flow is moderate, controlled by PLC that the first switch valve 4-1 closes, second switch valve 4-2 and the 3rd switch valve 4-3 opens, now the second standard scale 5-2 and the 3rd standard scale 5-3 use in parallel; When required fluid flow is larger, control the first switch valve 4-1, second switch valve 4-2 and the 3rd switch valve 4-3 opens, the first standard scale 5-1, the second standard scale 5-2 and the 3rd standard scale 5-3 parallel connection is used.In verification process, gathered the level value in oil tank by fluid level transmitter 10, by temperature transmitter 11 measuring tempeature value, obtain the experimental data needed for calibrating, complete the calibrating to tank wagon volume.
When this system needs to carry out self calibration to standard scale, by PLC gauge tap valve, make that the 4th switch valve 7-1 opens, the 6th switch valve 8 cuts out, control the first switch valve 4-1 to open simultaneously, second switch valve 4-2 and the 3rd switch valve 4-3 closes, and makes the first standard scale 5-1, the second standard scale 5-2 and the 3rd standard scale 5-3 be in series connection.Liquid by entering piston type standard volume pipe 6 after three standard scales, thus completes the calibration to standard scale.After calibration terminates, open the 5th switch valve 7-5, the liquid in piston type standard volume pipe 6 is entered circulating water pool 12.
In the present embodiment, the specifications and models of three standard scales are identical, are the flowmeter that can carry out positive and negative measurement.
As shown in Figure 2, adopt PC as host computer, PLC as the form of slave computer with self-alignment automobile oil truck capacity automatic verification system, this ensure that real-time and the reliability of data acquisition and control.PLC adopts the S7-200 Programmable Logic Controller of Siemens S7 series, is connected with computing machine by RS-485 communication port, adopts and supports that PPI or MPI communication protocol communicates.The model that CPU selects is CPU224XPCN, this CPU has 14 digital quantity input points and 10 digital quantity output points, 2 tunnel analog inputs and 1 road modulating output are provided, No. 6 high-speed counters (the single-phase high-speed counter of 4 road 30kHz and 2 road 200kHz bidirectional high speed counters), user data (as zone bit state, data block, timer, counter) stores about 5 days by the super capacitor of inside.The operation data type of S7-200PLC can be position, byte, word or double word, has IEC1131-3 instruction set in main frame, provides multiple different application protocol.This controller can expand maximum 7 modules in addition, comprise 168 digital quantities count and 38 analog quantitys count.2 road RS-485 communication interfaces can communicate with other equipment, comprise host computer and other controllers.
Within the system, the main data gathered have temperature signal, liquid level signal and flow signal, and these signals are the 4-20mA signal of standard, and these input signals are gathered by the expanded mode analog quantity load module EM231 of S7-200PLC.This module has 12 bit resolutions, and namely resolution is 5 μ A, and the maximum conversion time is 250 μ s.The direct current 24V power supply that this module provides with field apparatus is powered, and has 4 groups of analog input channels.Analog input module is measured range by configuration switch DIP to it and is arranged.These parameters can meet the needs of system actual acquisition experimental data.
Within the system, need to control, variable valve and switch valve.To the control of switch valve mainly through digital output modul, exported by the I/O mouth relay of S7-200 and control, 220VAC isolation and amplifier, reaches the object that gauge tap valve opens and closes.For variable valve, then undertaken by 4-20mA electric current, during equipment runs, 4-20mA output signal is exported by the expanded mode analog quantity output module EM232 of S7-200PLC, interior external circuit separates by the photoelectrical coupler in module, prevents external electromagnetic interference signal from causing interference to PLC internal circuit.This module is direct current 24V Power supply, has 2 groups of analog output channels, and the time that electric current exports is 2ms.
As shown in Figure 3, be automobile oil truck capacity calibrating function and self-correcting function realization flow figure.Open login system by local PC, assay calibration function pages can be entered after username and password is proved to be successful, otherwise cannot normally enter assay calibration interface.
Log in successfully, first select the calibration of standard scale still to the calibrating of tank wagon.Wherein the calibration of standard scale is all realized automatically, finally provide the calibration result of standard scale.When standard scale has problems, program can terminate automatically, can not proceed calibrating, need end program to check standard scale.
After selecting tank wagon volume calibration, need to select the marked capacity of road tanker, then the use of standard scale selected, can be single only, two parallel connections, three parallel connections or three series connection any one forms.Also to arrange data acquisition channel simultaneously, measurement range selection and sensor parameters etc. arrange, and can import and export configuration file.
After completing relevant optimum configurations, the realization manually or automatically of calibrating function can be selected.
Manual verification process is, manual input capacity calibrating point, PLC regulating and controlling valve opening after starting, reach flow setting value, start to examine and determine by oil skimming tank after stable, gather correlate meter data, and show data and the curves such as liquid level, temperature, flow in real time, after this some calibration completes, then start the calibrating of next calibrating point.Repeat above process to all calibratings and put calibrating.
Automatic Verification process is, according to the tested oil tank volume selected and vertification regulation, system is by Lookup protocol capacity calibrating point, and after starting, the step according to vertification regulation is completed whole verification process by program.
Generation, storage, printing reports and capacities chart can be selected after having examined and determine, and select again examine and determine or quit a program.Before quitting a program, system just switches off the pump and respective valves.
Claims (3)
1. be with self-alignment automatic capacity calibration device for tank truck, comprise water pump, buffer tank, variable valve, the first switch valve, second switch valve, the 3rd switch valve, the first standard scale, the second standard scale, the 3rd standard scale, piston type standard volume pipe, the 4th switch valve, the 5th switch valve, the 6th switch valve and circulating water pool, and fluid level transmitter in automobile oil truck and temperature transmitter, it is characterized in that:
Water pump is communicated with circulating water pool by pipeline, water delivery side of pump is connected with the entrance of buffer tank, the outlet of buffer tank is connected with the entrance of variable valve, the entrance that pipeline is measured in outlet and the calibrating of variable valve is connected, the outlet that pipeline is measured in calibrating has two branch roads, one tunnel is standard scale calibration branch road, and another branch road is connected with tank wagon by the 6th switch valve successively, is also provided with fluid level transmitter and temperature transmitter in described tank wagon;
Described calibrating measuring tube route first switch valve, second switch valve, the 3rd switch valve, the first standard scale, the second standard scale and the 3rd standard scale composition, the entrance of the first switch valve and second switch valve is interconnected, and forms the entrance that pipeline is measured in calibrating; The outlet of the first switch valve is connected with the entrance of the first standard scale, and the outlet of second switch valve is connected with the entrance of the second standard scale and the 3rd standard scale, and the first standard scale is connected with the entrance of the 3rd switch valve with the outlet of the second standard scale; The outlet of the 3rd switch valve is connected with the outlet of the 3rd standard scale, forms the outlet that pipeline is measured in calibrating;
Described standard scale calibration branch road is disposed with the 4th switch valve, piston type standard volume pipe, the 5th switch valve; The outlet that pipeline is measured in entrance and the calibrating of the 4th switch valve is connected, the outlet of the 4th switch valve is connected with the entrance of piston type standard volume pipe, the outlet of piston type standard volume pipe is connected with the entrance of the 5th switch valve, and the outlet of the 5th switch valve is connected with circulating water pool.
2. utilize the device described in claim 1 to carry out the method for examining and determine, its specific features is:
After starting water pump, the liquid in circulating water pool obtains the fluid of steady pressure after buffer tank; By PLC regulating and controlling valve opening to obtain suitable flow; The opening and closing of the first switch valve, second switch valve and the 3rd switch valve are controlled by PLC, can make the first standard scale, the second standard scale and the 3rd standard scale with single only, two parallel connections, three parallel connections or three series connection modes access calibrating and measure in pipeline and use, wherein adopt can the flowmeter of forward and reverse measurement for the second standard scale; Temperature transmitter, fluid level transmitter gather in road tanker and examine and determine required data.
3. method according to claim 2, is characterized in that:
Control the first switch valve by PLC to open, second switch valve and the 3rd switch valve are closed, the first standard scale, the second standard scale and the 3rd standard scale is made to be in series connection, control the 6th switch valve cuts out by PLC, liquid flows into piston type standard volume pipe by the 4th switch valve, thus standard scale is calibrated, the liquid in piston type standard volume pipe flows into circulating water pool by the 5th switch valve.
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| CN104359521B (en) * | 2014-11-15 | 2017-11-28 | 北京航天计量测试技术研究所 | A kind of Large Copacity tank volume detecting system and scaling method |
| CN106017620B (en) * | 2016-07-30 | 2023-04-28 | 温州恒海科技有限公司 | Intelligent piston volume tube calibrating device |
| CN106556430A (en) * | 2016-10-17 | 2017-04-05 | 金卡高科技股份有限公司 | A kind of gas Actual flow test system and method with self-calibration function |
| CN107421598B (en) * | 2017-06-21 | 2020-12-11 | 华南农业大学 | Liquid quantity monitoring device and monitoring method |
| CN110895202B (en) * | 2018-09-12 | 2021-10-29 | 北京振兴计量测试研究所 | Test device for researching influence of environmental factors on flow measurement |
| CN109708728A (en) * | 2018-12-11 | 2019-05-03 | 广州能源检测研究院 | A kind of movable type mass flowmenter on-line calibration device and method |
| CN109459553B (en) * | 2019-01-07 | 2021-07-23 | 浙江锦成科技有限公司 | Water quality monitoring sensor calibration solution recycling method and system |
| CN110793601B (en) * | 2019-11-29 | 2021-07-30 | 三一汽车制造有限公司 | Method for calibrating level indicator, level indicator and asphalt station |
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| CN102042856A (en) * | 2009-10-16 | 2011-05-04 | 中国计量科学研究院 | Device and method for automatically metering and calibrating horizontal tank capacity based on standard metal tank |
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