CN102494744A - Large-flow automatic detection device and detection method for water meters - Google Patents
Large-flow automatic detection device and detection method for water meters Download PDFInfo
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- CN102494744A CN102494744A CN2011104441870A CN201110444187A CN102494744A CN 102494744 A CN102494744 A CN 102494744A CN 2011104441870 A CN2011104441870 A CN 2011104441870A CN 201110444187 A CN201110444187 A CN 201110444187A CN 102494744 A CN102494744 A CN 102494744A
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Abstract
The invention discloses a device and a method for error detection under the conditions of large flows of water meters. According to the device, a computer is used for comprehensively controlling a detection process, calculating errors and managing test data; photoelectric sensors are used for converting rotating signals of plum-blossom needles of standard water meters and the tested water meters into electric square wave signals, and outputting the electric square wave signals to an input port of a controller; the controller is used for executing specific control action and data acquisition; a flow control part takes the output signals of the photoelectric sensors of the standard water meters as feedback controls of flow control; an error measurement part acquires the output signals of the photoelectric sensors of the standard water meters and the tested water meters; a decimal pulse counting method is adopted for the data acquisition; and acquired data is transmitted to the computer, and the computer calculates error values of the tested water meters according to the test data. By the device and the decimal pulse counting method, time for testing the water meters can be effectively shortened, so that water meter testing efficiency can be greatly improved, and a production bottleneck problem caused by low water meter testing speed in the batch production of the water meters can be solved.
Description
Technical field
The invention belongs to the Automatic Measurement Technique field, be specifically related to the pick-up unit of the big flow error of a kind of water meter.
Background technology
At present, in the testing process of water meter, mainly use the manual pick-up unit of positive displacement, mainly the water yield indicating value through relatively flowing through tested water meter and the difference error of calculation of volumetric standard.In operating process,, when the indicating value of the indicating value of water-meter reading and volumetric standard, cause personal error easily to the having relatively high expectations of operating personnel; At checking flow hour, in order to reduce personal error, the total flow that need flow through is bigger, and the time is longer, is 25 liters of/hour these flow points like checking flow, and the water yield that flows through accumulation if desired reaches 10 liters, and then checking time is 24 minutes.Automatic water meter calibration device is also arranged at present; Substitute manual read's list index data of fetching water through video camera, handle through image recognition technology, the tested water meter of each piece needs a high-resolution video camera; And the software processes difficulty is higher; If the string school, this method cost is too high, is not suitable for production in enormous quantities equipment.
Summary of the invention
The purpose of this invention is to provide a kind of real intelligent water meter pick-up unit and method, make the testing process of water meter simple, shorten the test duration, increase work efficiency, to satisfy the production in enormous quantities of water meter.
The present invention adopts following technical proposals:
The big flow automatic detection device of a kind of water meter comprises computing machine, controller, a plurality of photoelectric sensor, solenoid valve, standard water meter, electronic control ball valve; It is characterized in that:
Water inlet end at device is equipped with solenoid valve, and the water side is equipped with electronic control ball valve;
Standard water meter and tested water meter are installed in the pipeline between solenoid valve and the electronic control ball valve successively;
The output terminal of said controller connects solenoid valve, electronic control ball valve respectively, and said controller is through solenoid control test water source opening and closing, and said controller is regulated through electronic control ball valve and is used for test water source flux size;
Said a plurality of photoelectric sensor be installed in respectively standard water meter and tested water meter directly in order to measure the flow value of said standard water meter and tested water meter; Said photoelectric sensor output terminal is connected to the input end of controller, and measured flow value is uploaded to said controller;
Said computing machine connects controller through bus, computing machine to said controller transmitted traffic control, the error testing order, the flow value of the command response of reception controller and each measured water meter calculates the error of tested table tool.
Based on the big flow automatic detection device of above-mentioned water meter, the invention also discloses a kind of detection method, it is characterized in that, said method comprising the steps of:
The first step, computing machine is to controller sending flow rate control command;
In second step, the controller opens solenoid valve is controlled electronic control ball valve, makes the flow size that flows through standard water meter and tested water meter reach setting value, and the feedback signal during flow regulation adopts the square-wave signal of the photoelectric sensor output of standard water meter;
In the 3rd step, computing machine issues the error testing order to said controller after receiving replying that the flow control of controller accomplishes, and said controller remains the control to flow;
In the 4th step, controller is gathered the pulse signal of the photoelectric sensor of standard water meter and tested water meter according to the time parameter of test command, and calculates the decimal pulse, and the pulse data of measuring is sent to computing machine; The computing method of said decimal pulse are the quantity of the length of the imperfect pulse of initiating terminal and end when counting through acquisition pulse, total complete pulse, the total length of complete pulse; Calculate the average length of complete pulse; Calculate the ratio of imperfect pulse length of initiating terminal and end and average length then respectively, thereby calculate the fraction part of umber of pulse;
In the 5th step, computing machine calculates the error of every tested water meter according to the pulse data of passback, preserves database.
The decimal pulse computing method of this device and employing thereof can make the test duration of water meter effectively shorten, thereby significantly improve the water meter testing efficiency, solve the production bottleneck problem that the water meter detection speed brings slowly in the water meter production in enormous quantities.
Description of drawings
Accompanying drawing 1 is the big flow automatic detection device of a application's water meter structural representation;
Accompanying drawing 2 is the big flow automatic detection device of a application's water meter theory diagram;
Accompanying drawing 3 is the application's automatic testing method schematic flow sheet;
Accompanying drawing 4 is that the medium and small rapid pulse of the application embodiment dashes the calculating synoptic diagram.
Wherein, 1 is computing machine, and 2 is controller, and 2-1 is the controller flow-control module, and 2-2 is the controller error measurement module, and 3 is solenoid valve, and 4 is the laser photoelectricity sensor, and 5 is the standard water meter, and 6 is tested water meter, and 7 is electronic control ball valve.
Embodiment
Below in conjunction with Figure of description technical scheme of the present invention is explained further details.
The big flow automatic detection device of the application's water meter as shown in Figure 1 structural representation; A kind of intelligentized water meter pick-up unit; Entire equipment comprises computing machine 1, controller 2, solenoid valve 3, photoelectric sensor 4, standard scale 5, electronic control ball valve 7, and surveys water meter 6.
Described computing machine 1 is used to move TT&C software; The management testing step; With communicate by letter through RS232 between the controller, order and corresponding parameters such as sending flow rate control, error testing receive command response and test data that controller 2 is uploaded; And go out the error of tested water meter according to the calculation of parameter of test data and setting, realize the management and the networking of test data; Described controller 2 is used for communicating by letter with TT&C software; Control electromagnetic valve 3 is controlled electronic control ball valve 7, gathers the pulse data of photoelectric sensor 4 outputs; And the early stage of the photoelectric sensor data of gathering handle etc., used the computing method of decimal pulse during data processing; Described solenoid valve 3 is used to test the control of water source opening and closing; Described electronic control ball valve 7 is used for the adjusting of test traffic size, reaches the scope of water meter test procedure regulation through the flow size of standard water meter and tested water meter.Described photoelectric sensor 4 is used for converting the turn signal of the cutaneous acupuncture of standard water meter and tested water meter into controller treatable electric impulse signal.The flow size feedback element that described standard scale (5) is used for flow when regulating automatically, and the benchmark of tested water meter Error Calculation.
Be illustrated in figure 2 as the big flow automatic detection device of the application's water meter theory diagram, comprise computing machine 1, effect as previously mentioned; Concrete action is carried out in the order that controller 2, receiving computer issue, and comprises flow-control module 2-1 and error measure module 2-2; Wherein, flow-control module 2-1 is responsible for and computing machine 1 communication; Control electromagnetic valve 3 realizes the unlatching at water meter test water source or closes; The output pulse of the photoelectric sensor 4 of collection standard water meter; According to the controlled variable in the flow control order; The size of the opening degree through the electronic control ball valve 7 of PID calculation control; Realize the automatic adjusting of flow size, make the flow size that flows through standard water meter and tested water meter reach the flow magnitude range of water meter test procedure regulation; Be responsible for the communication with error measure module 2-2 simultaneously, transmit the order that module 2-2 such as error measure order needs, and the data forwarding that need send to computing machine 1 to module 2-2 be to computing machine 1.Error measure module 2-2 is according to error testing order and test duration parameter; In official hour, accomplish the collection of photoelectric sensor 4 output umber of pulses; Calculate the decimal umber of pulse, arrive computing machine to the decimal pulse transmission of the standard water meter of test and tested water meter through module 2-1.
As shown in Figure 3, a complete test process comprises following five steps: the first step, computing machine 1 sending flow rate control command; In second step, module 2-1 opens solenoid valve 3 in the controller 2, controls electronic control ball valve 7, makes the flow size that flows through standard water meter and tested water meter reach setting value; In the 3rd step, computing machine issues the error testing order after receiving replying that the flow control of controller 2 accomplishes, and module 2-1 is forwarded to module 2-2 to the error testing order, and module 2-1 remains the control to flow simultaneously; In the 4th step, the module 2-2 of controller 2 gathers the pulse signal of the photoelectric sensor of standard water meter and tested water meter according to the time parameter of test command, and calculates the decimal pulse, and 2-1 sends to computing machine to data through module; In the 5th step, computing machine calculates the error of every tested water meter according to the pulse data of passback, preserves database.So far, a complete test is accomplished.
Wherein, the flow size is controlled automatically and is specified as follows:
In the control procedure of flow, adopt the PID control technology.The conduct of PID (PID) controller is existing more than 50 year history of controller of practicability the earliest, remains most widely used industrial control unit (ICU) now.The PID controller is easily understood, and does not need condition precedents such as accurate system model in the use, thereby becomes application controller the most widely.PID control is divided into position model PID and increment type PID (concrete PID control is referring to PID control system related data).Native system adopts position model PID to control, and computing formula is simple, is fit to handle with single-chip microcomputer, and its computing formula is:
Wherein: Kp is a scale-up factor, and Ki is an integral coefficient, and Kd is a differential coefficient
The cutaneous acupuncture of water meter has the rotating speed of unique correspondence under certain flow value, be the electric impulse signal of certain frequency through conversion of photoelectric sensor, and promptly rotating speed to a fixed value through the control cutaneous acupuncture just can obtain the corresponding flow value.Employing is fed back as the flow signal that PID controls corresponding to the pulse signal of cutaneous acupuncture rotating speed, through PID calculating, and the electronic control ball valve of output control, the change flow is big or small, the stabilization of speed of cutaneous acupuncture is promptly obtained the stable flow rate value of correspondence to desired value.Through changing the controlled variable that computing machine issues, can realize the continuous adjusting (in maximum flow that system can reach and 1000 liters of/hour scopes) of flow.
The error testing of tested table specifies as follows:
In the table tool string school, the water yield that in the identical time, flows through the table tool is identical, writes down the reading of every table tool respectively, obtains the indicating value of every table tool.If wherein the error amount of a table tool is known, just can obtain the water yield of reality through its error correction, the error of residue table tool can be through calculating, i.e. the standard scale relative method.
In the water meter, cutaneous acupuncture rotates a circle and represents a fixing water yield, simultaneously, exports fixing umber of pulse (scale according to cutaneous acupuncture is confirmed) through photoelectric sensor, i.e. the certain water yield of each pulse representative.Can obtain showing the indicating value flow of tool through the umber of pulse of calculating photoelectric sensor output, through calculating the error that can obtain tested table.
In the test,, must guarantee that the umber of pulse sum is enough big if in order to reduce the influence of individual pulse.As, ading up to 1000, one of the error of umber of pulse, its error are 0.1%; If add up to 300, the error of umber of pulse is 0.3, i.e. 1/3 pulse, and its error is similarly 0.1%.So under the situation that guarantees certain measuring accuracy, adopted decimal pulse Calculation Method, can effectively reduce the test duration.As, the DN15 water meter is under the 2500L/h at flow commonly used, Measuring Time can shorten to actual 10 seconds of test duration by 2.4 minutes (100L water, volumetric method test).
Wherein, the detailed method of decimal pulse calculating is following:
As shown in Figure 4 is the pulse synoptic diagram that is formed by the standard scale of photoelectric sensor output and the cutaneous acupuncture rotation of two tested water meters wherein.Handle this three road signal by the microcontroller capture channel, obtain the total umber of pulse of every road pulse, the periodic quantity of each pulse obtains each required among figure time value simultaneously.
Wherein, obtain the decimal umber of pulse through following method:
The time point of A point for beginning to measure among the figure, the B point is for finishing the Measuring Time point.The time span of t1, t3, the initial imperfect pulse of the moment of t7 wherein; T2, t4, t8 are the time span of the imperfect pulse finish time; T5, t6, t9 are the T.T. length of complete pulse, and its corresponding pulse adds up to m, n, the calculating of the umber of pulse of k mixed decimal, difference t1+t2 writing time, t3+t4, t7+t8, t5, t6, t9;
The umber of pulse of the mixed decimal of tested table 1 is: m+ (t1+t2)/(t5/m)
The umber of pulse of the mixed decimal of tested table 2 is: n+ (t3+t4)/(t6/n)
The umber of pulse of the mixed decimal of standard scale is: k+ (t7+t8)/(t9/k).
Claims (7)
1. the big flow automatic detection device of water meter comprises computing machine, controller, a plurality of photoelectric sensor, solenoid valve, standard water meter, electronic control ball valve; It is characterized in that:
Water inlet end at device is equipped with solenoid valve, and the water side is equipped with electronic control ball valve;
Standard water meter and tested water meter are installed in the pipeline between solenoid valve and the electronic control ball valve successively;
The output terminal of said controller connects solenoid valve, electronic control ball valve respectively, and said controller is through solenoid control test water source opening and closing, and said controller is regulated through electronic control ball valve and is used for test water source flux size;
Said a plurality of photoelectric sensor be installed in respectively standard water meter and tested water meter directly in order to measure the flow value of said standard water meter and tested water meter; Said photoelectric sensor output terminal is connected to the input end of controller, and measured flow value is uploaded to said controller;
Said computing machine connects controller through bus, computing machine to said controller transmitted traffic control, the error testing order, the flow value of the command response of reception controller and each measured water meter calculates the error of tested water meter.
2. the big flow automatic detection device of water meter according to claim 1 is characterized in that:
Said controller is controlled electronic control ball valve, by the flow control order that computing machine issues the test water source flux that flows through is controlled automatically, makes the flow size satisfy the regulation of water meter calibration rules.
3. according to claim or the big flow automatic detection device of 2 described water meters, it is characterized in that:
Said controller comprises flow-control module and error measure module, and wherein said flow-control module is used to control electronic control ball valve and solenoid valve, and said error measure module receives the measurement data of a plurality of photoelectric sensors.
4. the big flow automatic detection device of water meter according to claim 3 is characterized in that:
Said flow-control module also receives the measurement data of the standard water meter of measuring through photoelectric sensor; Flow feedback signal when regulating automatically as flow; And according to the controlled variable in the flow control order; The size of the opening degree through the electronic control ball valve of PID calculation control realizes the automatic adjusting of flow size.
5. the big flow automatic detection device of water meter according to claim 1 is characterized in that:
Described photoelectric sensor is used for converting the turn signal of the cutaneous acupuncture of standard water meter and tested water meter into controller treatable electric impulse signal.
6. the big flow automatic detection device of water meter according to claim 5 is characterized in that:
When said controller is gathered standard water meter and tested water meter photoelectric sensor output umber of pulse, make pulse counting method decimally.
7. the water meter detection method based on the big flow automatic detection device of the described water meter of claim 1-6 is characterized in that, said method comprising the steps of:
The first step, computing machine is to controller sending flow rate control command;
Second step, through the controller opens solenoid valve, control electronic control ball valve, make the flow size that flows through standard water meter and tested water meter reach setting value;
In the 3rd step, computing machine issues the error testing order to said controller after receiving replying that the flow control of controller accomplishes, and said controller remains the control to flow;
In the 4th step, controller is gathered the pulse signal of the photoelectric sensor of standard water meter and tested water meter according to the time parameter of test command, and calculates the decimal pulse, and pulse data is sent to computing machine;
The computing method of said decimal pulse are the quantity of the length of the imperfect pulse of initiating terminal and end when counting through acquisition pulse, total complete pulse, the total length of complete pulse; Calculate the average length of complete pulse; Calculate the ratio of imperfect pulse length of initiating terminal and end and average length then respectively, thereby calculate the fraction part of umber of pulse;
In the 5th step, computing machine calculates the error of every tested water meter according to the pulse data of passback, preserves database.
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| CN104019871A (en) * | 2014-06-10 | 2014-09-03 | 宁波水表股份有限公司 | Household watermeter on-site calibration instrument and calibration method thereof |
| CN113375765A (en) * | 2021-07-06 | 2021-09-10 | 金卡水务科技有限公司 | Measuring instrument detection method and device and storage medium |
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| CN104019871A (en) * | 2014-06-10 | 2014-09-03 | 宁波水表股份有限公司 | Household watermeter on-site calibration instrument and calibration method thereof |
| CN113375765A (en) * | 2021-07-06 | 2021-09-10 | 金卡水务科技有限公司 | Measuring instrument detection method and device and storage medium |
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Application publication date: 20120613 |