CN112484821A

CN112484821A - Full-automatic testing arrangement of water gauge static pressure

Info

Publication number: CN112484821A
Application number: CN202011437642.XA
Authority: CN
Inventors: 王一民; 马俊; 励争取; 虞成斌; 冯亚军
Original assignee: Ningbo Institute Of Metrology And Testing Ningbo New Material Inspection And Testing Center
Current assignee: Ningbo Institute Of Metrology And Testing Ningbo New Material Inspection And Testing Center
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-03-12

Abstract

A full-automatic testing device for the static pressure of a water meter comprises a meter clamping part, a pressurizing part, a pressure detecting part, a control part and a video monitoring part, wherein the video monitoring part can record the detection process and the detection time of the static pressure of the water meter on the water meter to be detected respectively, the control part is connected with the meter clamping part, the pressurizing part and the pressure detecting part respectively through lines, the meter clamping part, the pressurizing part and the pressure detecting part are communicated with a water tank through pipelines to form a water circulation circuit, the meter clamping part is composed of N meter clamping mechanisms which are arranged in parallel and can be connected into the water meter to be detected respectively, each meter clamping mechanism is connected with one corresponding pressure detecting part respectively, the pressurizing part is connected with the meter clamping mechanisms through respective switch valves, and the video monitoring part is connected with the control part through lines. The invention has the advantages that: the water meter to be tested is independent of each other, is low in detection and false detection rate and high in automation degree.

Description

Full-automatic testing arrangement of water gauge static pressure

Technical Field

The invention relates to the technical field of pressure testing device manufacturing, in particular to a full-automatic testing device for static pressure of a water meter.

Background

With the recent rail joint between the national standard of water meters and the international standard of water meters, new versions of water meter metering verification rules, type evaluation principles, product quality supervision and spot check implementation specifications and evaluation rules are also successively released. At present, the pressure-resistant tables of the water meters used by various domestic water meter detection mechanisms and water meter manufacturers cannot meet the requirements of new standards, regulations and specifications, and a series of problems exist.

The prior Chinese patent application with the application number of CN201510449725.3 named as a calibrating device for a fluid metering instrument discloses a calibrating device for a fluid metering instrument, which consists of a pressure stabilizing device, a flow rate adjusting device and at least one sampling timing unit; the fluid for detection passes through the detection pipeline after being pressurized by the pressure stabilizing device, sequentially flows through at least one detected meter, is adjusted in flow speed and finally flows out of the detection pipeline; each detected meter is provided with a pulse time difference detection order; the flow rate adjusting device is connected with the sampling timing unit through a data communication line. The invention provides a flow meter calibration method more suitable for applying an electronic technology, so that the automation degree of a calibration device is improved, the calibration speed is increased, and the calibration cost is reduced. It not only can be used for the water gauge to examine and determine, but also is applicable to other calibrating installation with flow meter such as gas meter, oil meter, liquid flowmeter, gas flowmeter. However, when the calibrating device detects a plurality of water meters, the water pressure and the flow rate in different water meters affect each water meter, and if one of the detected water meters fails or is damaged, the condition that other water meters to be detected need secondary measurement may be caused, so that the water meter product is misjudged to be qualified or not, and therefore the structure of the calibrating device needs to be further improved.

Disclosure of Invention

The invention aims to solve the technical problem of providing a full-automatic testing device for the static pressure of the water meter, which has high testing efficiency, good effect, independent water meters to be tested, low false detection rate and high automation degree and is used for respectively detecting the water meters to be tested.

The technical scheme adopted by the invention for solving the technical problems is as follows: this full-automatic testing arrangement of water gauge static pressure, including can fix a position wait to detect the water gauge press from both sides the table portion, can change the pressurization portion that waits to detect water gauge internal water pressure size, detect wait to detect the pressure measurement portion that detects water gauge static pressure size on the water gauge and can realize the control part of water gauge static pressure automated inspection, the control part passes through the circuit and is connected with pressing from both sides table portion, pressurization portion, pressure measurement portion respectively, press from both sides table portion, pressurization portion, pressure measurement portion and constitute the water circuit through pipeline and water tank intercommunication, its characterized in that: the full-automatic testing device comprises a water meter to be tested, a meter clamping portion, a pressure boosting portion, a video monitoring portion and a control portion, wherein the meter clamping portion is composed of N meter clamping mechanisms which are arranged in parallel and can be respectively connected into the water meter to be tested, each meter clamping mechanism is respectively connected with a corresponding pressure detection portion, the pressure boosting portion is connected with the meter clamping mechanisms through respective switch valves, the full-automatic testing device further comprises the video monitoring portion capable of respectively recording the detection process and the detection time of the static pressure of the water meter on the water meter to be tested, the video monitoring portion is connected with the control portion through a line.

As an improvement, the meter clamping mechanism comprises a water inlet pipe, a water inlet branch pipe and a water outlet pipe, wherein the water inlet pipe can be communicated with a water inlet of the water meter to be detected, the water inlet branch pipe can be communicated with a water outlet of the water meter to be detected, the water inlet branch pipe is connected with the water inlet pipe in parallel, switch valves capable of opening and closing corresponding pipelines are arranged on the water inlet pipe, the water inlet branch pipe and the water outlet pipe respectively, and N pressure detection parts are arranged on the water outlet pipe between the water meter to be detected and the switch.

The improved water inlet branch pipe structure is characterized in that the switch valves are pneumatic ball valves capable of realizing quick opening and closing of corresponding pipelines, and manual valves capable of manually switching corresponding water inlet branch pipes are further connected to each water inlet branch pipe in series.

In a further improvement, a pipeline clamp is arranged between the pressure detection part and the corresponding water meter to be detected.

As an improvement, the meter clamping part, the pressurization part, the pressure detection part and the control part are installed on the same rack, the pressure detection part is a pressure detection meter, a pressure value display surface of the pressure detection meter is located on the outer surface of the rack, and the video monitoring part comprises a camera capable of recognizing pressure values on the pressure value display surface and feeding the values back to the control part.

The improved water meter detection device is characterized in that the rack is a fully-closed shell, the meter clamping part, the pressurization part and the pressure detection part are all arranged in the shell, the control part is arranged on the shell, and a door moving mechanism capable of being connected with and taken out of a water meter to be detected is arranged on the upper part of the shell.

As an improvement, the boosting part is a booster pump, a frequency converter capable of controlling the input water pressure is arranged on the booster pump, the frequency converter is connected with the control part, and a pipeline switch control valve and an initial water pressure measuring meter are arranged on a connecting pipeline of the booster pump and the meter clamping part.

The improved booster pump is characterized in that the number of the booster pumps is two, the first booster pump and the second booster pump are arranged in parallel, and the power of the second booster pump is larger than that of the first booster pump.

As an improvement, the specific steps of detecting the static pressure of the water meter by the full-automatic testing device are,

firstly, inputting detection parameters to a control part by a detection person;

the control part closes the water inlet pipe and the water outlet pipe, and the water inlet branch pipe is opened;

thirdly, the control part controls the pressurization part to gradually pressurize the water meters to be detected according to preset detection parameters, in the pressurization process, the video monitoring part constantly reads the numerical values of the pressure detection parts corresponding to the water meters to be detected and feeds the numerical values back to the control part, the control part judges whether the condition of obvious pressure reduction exists or the condition that the pressure is not increased for a long time exists, if so, the corresponding water inlet branch pipe is closed, and the corresponding water meters to be detected fail to pressurize; if the situation does not exist, judging whether a set pressure value in the detection parameters is reached, closing the corresponding water inlet branch pipe once the set pressure value is reached, and entering a pressure maintaining stage;

in the pressure maintaining process of the water meters to be detected, the video monitoring part constantly reads the numerical values of the pressure detection parts corresponding to the water meters to be detected and feeds the numerical values back to the control part, the control part judges whether the pressure reduction condition exceeding the preset value in the detection parameters exists or not, and if the pressure reduction condition exists, the pressure maintaining is judged to fail; if the situation does not exist, the time of the timer is read, and when the preset value of the pressure maintaining time in the detection parameters is reached, the pressure maintaining is successful, the water inlet pipe and the water outlet pipe are opened, and the detection operation is finished.

And further improvement, in the fourth step, if all the water meters to be detected enter a pressure maintaining stage or are judged to be failed in pressurization, the booster pump of the pressurization part keeps low-frequency operation.

Compared with the prior art, the invention has the advantages that: the device creatively adopts a parallel pipeline structure, simultaneously carries out static pressure test on a plurality of water meters to be detected, breaks through the original serial connection mode of the traditional water meter pressure-resistant device, eliminates the defect that the water meters to be detected influence each other in the test process, ensures the accuracy and reliability of the detection result, and obviously improves the detection efficiency; the automatic testing of the device is realized through the control part, the accurate pressurization, pressure maintaining and pressure relief can be respectively carried out on a plurality of water meters to be detected according to the set pressure value and the set time value, the pressure value in the whole process is recorded, and a curve graph is given; the video monitoring part records the detection process of a test site, the state of the water meter to be detected, the video image data such as key pressure data and the like in real time, and stores the video image data in control software, so that the video monitoring part is convenient to call and manage.

Drawings

FIG. 1 is a schematic diagram of the piping and wiring connections of an embodiment of the present invention;

FIG. 2 is a perspective view showing a pipe connection structure in FIG. 1;

FIG. 3 is a cross-sectional view of FIG. 1 illustrating an alternative pressurization arrangement;

FIG. 4 is a schematic view of the structure of FIG. 3;

FIG. 5 is a side elevational view of FIG. 4;

FIG. 6 is a front perspective view of the structure of FIG. 4 mounted in a housing;

FIG. 7 is a schematic flow chart of an application of the detection apparatus in FIG. 1;

fig. 8 is a flow chart of control software in the controller of fig. 1.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1 to 2 and 7, the fully automatic testing device for testing static pressure of a water meter of the present embodiment includes a meter clamping portion capable of positioning the water meter 4 to be tested, a pressurizing portion capable of changing the water pressure inside the water meter 4 to be tested, a pressure detecting portion for detecting the static pressure of the water meter on the water meter 4 to be tested, and a control portion 9 capable of automatically detecting the static pressure of the water meter, wherein the control portion 9 is connected to the meter clamping portion, the pressurizing portion, and the pressure detecting portion through a pipeline and a water tank 6 to form a water circulation loop, the meter clamping portion includes N meter clamping mechanisms connected in parallel and capable of being respectively connected to the water meter 4 to be tested, each meter clamping mechanism is connected to a corresponding pressure detecting portion, the pressurizing portion is connected to the meter clamping mechanism through a respective switch valve, the fully automatic testing device further includes a video monitoring portion 91 capable of respectively recording the detection process and detection time of the static pressure of the water meter 4 to be tested, the video monitor 91 is connected to the control unit 9 via a line, and N is a natural number greater than 1.

The meter clamping mechanism comprises a water inlet pipe 1 which can be communicated with a water inlet of the water meter 4 to be detected, a water inlet branch pipe 11 and a water outlet pipe 2 which can be communicated with a water outlet of the water meter 4 to be detected, the water inlet branch pipe 11 is connected with the water inlet pipe 1 in parallel, on and off valves which can open and close corresponding pipelines are respectively arranged on the water inlet pipe 1, the water inlet branch pipe 11 and the water outlet pipe 2, and N pressure detection parts are arranged on the water outlet pipe 2 between the water meter 4 to be detected and the on and off valves correspondingly. The switch valve is a pneumatic ball valve 3 which can realize the quick opening and closing of the corresponding pipeline, and a manual valve 30 which can manually switch the corresponding water inlet branch pipe 11 is also connected in series on each water inlet branch pipe 11. A pipe clamp 12 is arranged between the pressure detection part and the corresponding water meter 4 to be detected.

Press from both sides table portion, pressurization portion, pressure measurement portion and control division 9 and install on same frame 7, and pressure measurement portion is pressure measurement table 5, and pressure measurement table 5's pressure value display surface is located the surface of frame 7, and video monitoring portion 91 is including the camera that can discernment pressure value on the display surface and feed back numerical value to control division 9. The frame 7 is a totally-enclosed shell, the meter clamping part, the pressurization part and the pressure detection part are all arranged in the shell, the control part 9 is arranged on the shell, and the upper part of the shell is provided with a door moving mechanism 71 which can be used for accessing and taking out the water meter 4 to be detected. The specific structure of the door moving mechanism 71 is well known in the art and will not be described in detail. The specific circuit structure of the circuit module used by the video monitoring unit 91 is well known in the art and will not be described in detail. The specific circuit structure of the control unit 9 belongs to the prior art, and therefore, will not be described in detail. The booster part is a booster pump, namely, a first booster pump 81 shown in fig. 2, a frequency converter capable of controlling the input water pressure is arranged on the booster pump, the frequency converter is connected with the control part 9, and a pipeline switch control valve and an initial water pressure measuring meter are arranged on a connecting pipeline of the booster pump and the meter clamping part.

The method for detecting the static pressure of the water meter by the full-automatic testing device comprises the following specific steps,

firstly, inputting detection parameters to the control part 9 by a detection person;

secondly, the control part 9 closes the water inlet pipe 1 and the water outlet pipe 2, and the water inlet branch pipe 11 is opened;

thirdly, the control part 9 controls the pressurization part to gradually pressurize the water meters 4 to be detected according to preset detection parameters, in the pressurization process, the video monitoring part 91 constantly reads the numerical value of the pressure detection part corresponding to each water meter 4 to be detected and feeds the numerical value back to the control part 9, the control part 9 judges whether the condition of obvious pressure reduction exists or the condition that the pressure is not increased for a long time, if so, the corresponding water inlet branch pipe 11 is closed, and the corresponding water meter 4 to be detected fails in pressurization; if the situation does not exist, whether the set pressure value in the detection parameters is reached is judged, and once the set pressure value is reached, the corresponding water inlet branch pipe 11 is closed, and the pressure maintaining stage is started;

in the pressure maintaining process of the water meters 4 to be detected, the video monitoring part 91 constantly reads the numerical values of the pressure detection parts corresponding to the water meters 4 to be detected and feeds the numerical values back to the control part 9, the control part 9 judges whether the pressure drop exceeding the preset value in the detection parameters exists or not, and if the pressure drop exceeding the preset value in the detection parameters exists, the pressure maintaining is judged to fail; if the situation does not exist, the timer time is read, and when the preset value of the pressure maintaining time in the detection parameters is reached, the pressure maintaining is successful, the water inlet pipe 1 and the water outlet pipe 2 are opened, and the detection operation is finished.

In the fourth step, if all the water meters 4 to be detected enter the pressure maintaining stage or are judged to be failed in pressurization, the booster pump of the pressurization part keeps low-frequency operation. The detection parameters include a preset value of pressure maintaining time, an average pressurizing rate of gentle pressurization, a minimum pressure value when the pressure detection part maintains pressure, and a pressurizing pressure value. The sensed parameters may also include sensed environmental parameters such as air humidity, room temperature, room air pressure, etc.

The dotted line in fig. 1 indicates that the video monitoring unit monitors the situation of each part corresponding to the dotted line in real time through the camera, and feeds back the information to the control unit 9 in time.

The control part of the device adopts computer control software, the software runs on a brand machine and is matched with a PLC (programmable logic controller) to realize the automatic management of the whole device, including the control of the processes of pressurization, pressure maintaining and pressure relief; judging a result; data saving and the like, and a function of exporting and printing result data. The pipeline switch control valve also adopts a pneumatic ball valve 3, and the initial water pressure measuring meter and the pressure detecting meter 5 have the same structure. .

As shown in fig. 1, 3 and 8, the fully automatic testing device for hydrostatic pressure of a water meter according to the second embodiment comprises a meter clamping portion capable of positioning a water meter 4 to be tested, a pressurizing portion capable of changing the magnitude of the hydrostatic pressure in the water meter 4 to be tested, a pressure detecting portion for detecting the magnitude of the hydrostatic pressure on the water meter 4 to be tested, and a control portion 9 capable of automatically detecting the hydrostatic pressure of the water meter, wherein the control portion 9 is connected with the meter clamping portion, the pressurizing portion and the pressure detecting portion through a line, the meter clamping portion, the pressurizing portion and the pressure detecting portion are communicated with a water tank 6 through a pipeline to form a water circulation circuit, the meter clamping portion comprises N meter clamping mechanisms which are arranged in parallel and can be respectively connected to the water meter 4 to be tested, each meter clamping mechanism is connected with a corresponding pressure detecting portion, the pressurizing portion is connected with the meter clamping mechanism through a respective switch valve, the fully automatic testing device further comprises a video monitoring portion 91 capable of respectively recording the detection process and detection time of the hydrostatic, the video monitor 91 is connected to the control unit 9 via a line, and N is a natural number greater than 1.

Press from both sides table portion, pressurization portion, pressure measurement portion and control division 9 and install on same frame 7, and pressure measurement portion is pressure measurement table 5, and pressure measurement table 5's pressure value display surface is located the surface of frame 7, and video monitoring portion 91 is including the camera that can discernment pressure value on the display surface and feed back numerical value to control division 9. The frame 7 is a totally-enclosed shell, the meter clamping part, the pressurization part and the pressure detection part are all arranged in the shell, the control part 9 is arranged on the shell, and the upper part of the shell is provided with a door moving mechanism 71 which can be used for accessing and taking out the water meter 4 to be detected. The specific structure of the door moving mechanism 71 is well known in the art and will not be described in detail. The specific circuit structure of the circuit module used by the video monitoring unit 91 is well known in the art and will not be described in detail. The specific circuit structure of the control unit 9 belongs to the prior art, and therefore, will not be described in detail.

The booster pump is arranged on the pressure increasing portion, a frequency converter capable of controlling the input water pressure is arranged on the booster pump, the frequency converter is connected with the control portion 9, and a pipeline switch control valve and an initial water pressure measuring meter are arranged on a connecting pipeline of the booster pump and the meter clamping portion. The number of the booster pumps is two, the first booster pump 81 and the second booster pump 82 are arranged in parallel, and the power of the second booster pump 82 is larger than that of the first booster pump 81. Typically, the first booster pump 81 is sized to provide a water pressure of 2.5Mpa and the second booster pump 82 is sized to provide a water pressure of 4 Mpa. The second booster pump 82 is communicated with the water inlet branch pipe 11, the first booster pump 81 is communicated with the water inlet pipe 1, and the corresponding pipeline is opened and closed by opening and closing the corresponding switch valve.

The control part of the device adopts computer control software, the software runs on a brand machine and is matched with a PLC (programmable logic controller) to realize the automatic management of the whole device, including the control of the processes of pressurization, pressure maintaining and pressure relief; judging a result; data saving and the like, and a function of exporting and printing result data. The pipeline switch control valve also adopts a pneumatic ball valve 3, and the initial water pressure measuring meter and the pressure detecting meter 5 have the same structure.

The working principle is as follows: the device adopts a parallel structure design, realizes the independent and automatic test of static pressure on three water meters simultaneously, and improves the detection efficiency; the automatic pressure control technology is adopted to realize the linkage control of the test pressure and the test timing, and the accuracy of the detection parameters and the consistency of the detection process are ensured; by adopting the video monitoring technology, the whole process of the water meter static pressure test process is monitored, and the traceability of the detection result is ensured.

The testing device developed by the invention can completely meet the technical requirements of the latest version of national standard of the water meter, the water meter verification regulation, the product quality supervision and spot check implementation standard and the static pressure test in the evaluation rule on one hand, can simultaneously and independently test a plurality of water meters to be tested without influencing each other, can automatically complete the whole testing process under the control of a computer, and has the video recording function, the whole set of device has high automation degree, high detection efficiency and reliable detection result. On the other hand, the successful development of the device greatly improves the detection capability of the cold water meters in our hospital and our center, overcomes the defects in the original static pressure test of the water meters, eliminates the hidden danger of the inspection work, and lays a solid foundation for the smooth development of the supervision and spot check tasks of the water meters in all levels of the country, the province, the city and the county which come from the future, so that the parallel type full-automatic static pressure test device developed by the project can not only completely meet the requirements of the standards, regulations and the standards of the water meters, but also provide social notarization and reliable detection data, can change the design concept of the static pressure test device of the water meters, eliminate the hidden danger in the static pressure test, and improve the reliability of the inspection results of the water meters in our hospital.

The device is mainly applied to the cold water meter static pressure test of DN40 and below.

The technological structure of the device is improved on the basis of the traditional water meter static pressure test device, wherein the device mainly comprises two aspects:

1. the improvement on the structure:

novel parallel structure

The traditional hydrostatic pressure test device of the water meter generally adopts single test or series test, and the test pipeline of the traditional hydrostatic pressure test device is generally in a series structure. Although the multi-meter serial detection can improve the detection efficiency of the static pressure test, a large hidden danger exists in the detection process, once one tested meter leaks and bursts, the pressure is immediately reduced and cannot reach the test pressure, other water meters cannot continue to perform the test, and the judgment of the static pressure test results of other water meters is influenced. The device designs the test pipeline into a parallel structure, each tested water meter is provided with a respective independent static pressure test pipeline, and the static pressure test pipelines are controlled by valves and do not influence each other. However, the pressure sources of the three pipelines are from the same pump, the three pipelines connected in parallel are simultaneously pressurized by the same pump, and once the leakage and burst of the tested meter occur, the valve of the test pipeline is closed, so that other pipelines are not influenced. The parallel structure not only keeps the advantage that the serial structure can simultaneously carry out the static pressure test of a plurality of water meters and has high detection efficiency, but also solves the problem that the serial structure has the problem that the test result judgment of other water meters is influenced once one tested meter has the leakage and burst conditions, and ensures the reliability of the detection result.

A frequency conversion pump replaces an additional pump

The traditional water meter static pressure test device usually adopts the added pump to control the test pressure by the opening of a manual regulating valve of a detector, and the mode has higher requirement on the operator, so that the unreliable test result can be caused and the misjudgment can be caused once the detector is improperly operated, such as the over-fast or over-slow pressurization, the inaccurate pressure control and the like. This device uses ordinary water pump and converter jointly, adjusts the converter by the parameter that the computer set up according to the measurement personnel, thereby the size of automatic control water pump output pressure, and in the testing process, can feedback the pressure value of returning according to pressure transmitter, make actions such as pressure boost, steady voltage, pressure regulating, closing, make whole static pressure test process realize the full automatization, need not any manual operation, guaranteed the uniformity of every static pressure test process parameter well, ensured the reliability of testing result.

2. Pressure automatic control strategy

The pressure automatic control strategy is the core and key for realizing full-automatic detection of the water meter static pressure test device. Through the design of the pressure control strategy, three detected water meters distributed in parallel pipelines can share the same pressure source to respectively perform static pressure tests without mutual interference, and corresponding processing and scheduling can be given according to different conditions generated in the detection process, so that the whole detection process is accurate, reliable and safe, and the automation and intelligence degrees are high. The specific flow of strategy design is shown in fig. 7.

Firstly, a detector inputs necessary parameters such as detection pressure, pressure maintaining time and the like through control software to start detection; the upstream water inlet valve and the downstream valve of each detected water meter are closed, and the upstream bypass valve is opened; the frequency converter drives the water pump to carry out gentle pressurization according to preset parameters; in the pressurizing process, reading the numerical value of each pressure transmitter constantly, judging whether the condition of obvious pressure reduction exists or the condition that the pressure is not increased for a long time exists, if so, closing an upstream bypass valve of the corresponding water meter to be detected, and failing to pressurize the water meter to be detected; if the situation does not exist, judging whether the set pressure value is reached, closing an upstream bypass valve of the corresponding detected water meter once the detection pressure is reached, and entering a pressure maintaining stage; if all the detected water meters enter the pressure maintaining process or the pressure increasing failure is judged, the water pump can keep running at low frequency. In the pressure maintaining process, reading the numerical value of each pressure transmitter constantly, judging whether the pressure drop exceeding a preset value exists or not, and if so, judging that the pressure maintaining fails; if the situation does not exist and the time of the reading timer reaches the preset value of the pressure maintaining time, the pressure maintaining is successful, the downstream valve and the upstream water inlet valve are opened, and the test is finished.

The control part of the device adopts computer control software, the software runs on a brand machine and is matched with a PLC (programmable logic controller) to realize the automatic management of the whole device, including the control of the processes of pressurization, pressure maintaining and pressure relief; judging a result; data saving and the like, and a function of exporting and printing result data.

The software interface is designed according to the hardware arrangement position and the detection flow, accords with the specific detection process, and is visual and clear; the design is reasonable in operation, information input is convenient and fast, hardware response speed is high, and the method is simple and easy to operate. The design flow of the software is shown in detail in fig. 8. The circulating valve in fig. 8 is a switch valve on the water outlet pipe 2.

The project mainly solves the following problems:

1 eliminating the defects of the traditional static pressure test

When the traditional series static pressure test device simultaneously carries out static pressure test on three water meters to be tested, if one meter is leaked or burst, the judgment of the detection results of the other two meters can be influenced, so that how to ensure that the device developed by the project can eliminate the defects of the traditional static pressure test is the problem to be solved firstly;

2, improving the detection efficiency

The device is mainly applied to all levels of supervision and spot check of the water meter and water meter static pressure tests entrusted by enterprises, and most entrusts have the characteristics of heavy task, short time, long time consumption and the like, so that a severe challenge is provided for the detection efficiency of the device, and a key problem is how to improve the detection efficiency of the water meter static pressure on the premise of ensuring that the detection standard is strictly executed;

3 ensuring the accuracy of the detection parameters and the consistency of the detection process

Because the traditional water meter static pressure test process needs manual regulation of a valve to carry out pressurization and pressure relief and timing at the same time, the accuracy of detection parameters and the consistency of the detection process cannot be guaranteed, and the influence of human factors is huge, so that the detection result is possibly deviated. Therefore, the accuracy of the detection parameters and the consistency of the detection process are very important, and the accuracy and the reliability of the detection result can be ensured only by ensuring the accuracy and the consistency of the parameters in the whole detection process and reducing the human influence factors as much as possible;

4, the accuracy, the reliability and the traceability of the detection result are ensured

The water meter product quality supervision and spot check implementation specification specifies that: image recording is required during static pressure test, and sample number information, pressure instrument indication and result phenomena in the test process are continuously recorded. "this just requires that the water gauge static pressure test device should have automatic video recording function, guarantees the accurate reliable traceability of testing result.

The innovation point of the device is as follows:

1 parallel pipeline structure

The device creatively adopts a parallel pipeline structure, simultaneously carries out static pressure test on three tested water meters, breaks through the original serial connection mode of the traditional water meter pressure-resistant device, eliminates the defect that the tested water meters are mutually influenced in the test process, ensures the accuracy and reliability of the test result, and obviously improves the test efficiency;

2 automatic pressure control system

The device is innovatively provided with an automatic pressure control system, full-automatic implementation of a water meter static pressure test project is realized, accurate pressurization, pressure maintaining and pressure relief can be respectively carried out on three detected water meters according to set pressure values and time values, the pressure values in the whole process are recorded, and a curve graph is given.

3 video recording system

The device is provided with a video recording system, can record the detection process of a test site, the state of a detected water meter, key pressure data and other video image data in real time, and is stored in control software, so that the device is convenient to call and manage.

4 protective facility

During the static pressure test, because the test pressure is higher, if the water gauge of being examined is not withstand voltage, appear leaking, infiltration phenomenon easily, the extreme condition can also appear watchcase, dial plate glass condition such as bursting, not only water can be sprayed out, parts such as glass, plastics, metal also can splash out, cause personnel's injury easily, this device has been equipped with the emergence that protective device can effectively prevent this type of situation.

In conclusion, the device is designed according to the requirements of standard specifications such as national standards of water meters, water meter calibration regulations, water meter product quality supervision and spot inspection implementation specifications and the like, is improved on the basis of the traditional static pressure test device, and adopts a parallel pipeline structure to eliminate the defect that the detected water meters of the traditional serial static pressure test device influence each other in the test process; a full-automatic pressure control system is configured, so that the influence of manual operation is reduced, and the accuracy of detection parameters and the consistency of a detection process are ensured; and a video recording system is configured to comprehensively record the whole detection process, so that the accuracy, reliability and traceability of the detection result are ensured.

Claims

1. The utility model provides a full-automatic testing arrangement of water gauge static pressure, includes that can fix a position and wait to detect the double-layered table portion of water gauge (4), can change and wait to detect the pressurization portion of water gauge (4) internal water pressure size, detect and wait to detect the pressure detection portion of water gauge static pressure size and can realize water gauge static pressure automated inspection's control part (9) on water gauge (4), control part (9) are connected with pressing from both sides table portion, pressurization portion, pressure detection portion respectively through the circuit, press from both sides table portion, pressurization portion, pressure detection portion and lead to water circuit, its characterized in that are constituted through pipeline and water tank (6) intercommunication: the full-automatic testing device is characterized in that the meter clamping part is composed of N meter clamping mechanisms which are arranged in parallel and can be respectively connected into the water meters (4) to be tested, each meter clamping mechanism is connected with a corresponding pressure detection part, the pressurizing part is connected with the meter clamping mechanisms through respective switch valves, the full-automatic testing device further comprises a video monitoring part (91) which can respectively record the detection process and the detection time of the static pressure of the water meters on the water meters (4) to be tested, the video monitoring part (91) is connected with the control part (9) through a circuit, and N is a natural number greater than 1.

2. The fully automatic test apparatus of claim 1, wherein: press from both sides table mechanism including can with wait to detect inlet tube (1) that water gauge (4) water inlet is linked together, intake branch pipe (11) and can with wait to detect outlet pipe (2) that water gauge (4) delivery port is linked together, intake branch pipe (11) and inlet tube (1) parallel arrangement be provided with respectively on inlet tube (1), intake branch pipe (11), outlet pipe (2) and open and close the ooff valve that corresponds the pipeline, and a N pressure detection portion sets up in the corresponding outlet pipe (2) of waiting to detect between water gauge (4) and the ooff valve.

3. The fully automatic test apparatus of claim 2, wherein: the switch valve is a pneumatic ball valve (3) capable of realizing quick opening and closing of a corresponding pipeline, and a manual valve (30) capable of manually switching the corresponding water inlet branch pipe (11) is further connected to each water inlet branch pipe (11) in series.

4. The fully automatic test apparatus of claim 2, wherein: and a pipeline clamp (12) is arranged between the pressure detection part and the corresponding water meter (4) to be detected.

5. The fully automatic test device of any one of claims 1 to 4, wherein: press from both sides table portion, pressurization portion, pressure measurement portion and control division (9) and install on same frame (7), pressure measurement portion is pressure measurement table (5), the pressure value display surface of pressure measurement table (5) is located the surface of frame (7), video monitoring portion (91) are including the camera that can discernment pressure value on the pressure value display surface pressure value and feed back numerical value to control division (9).

6. The fully automatic test apparatus of claim 5, wherein: the machine frame (7) is a totally-enclosed machine shell, the meter clamping part, the pressurization part and the pressure detection part are all arranged in the machine shell, the control part (9) is arranged on the machine shell, and a door moving mechanism (71) capable of being connected into and taken out of the water meter (4) to be detected is arranged on the upper portion of the machine shell.

7. The fully automatic test device of any one of claims 1 to 4, wherein: the booster pump is arranged on the pressure increasing portion, a frequency converter capable of controlling the input water pressure is arranged on the pressure increasing portion, the frequency converter is connected with the control portion (9), and a pipeline switch control valve and an initial water pressure measuring meter are arranged on a connecting pipeline of the pressure increasing portion and the meter clamping portion.

8. The fully automatic test apparatus of claim 7, wherein: the booster pump is two, and first booster pump (81) and second booster pump (82) are parallelly connected to be set up, the power of second booster pump (82) is greater than the power of first booster pump (81).

9. The fully automatic test device of any one of claims 2 to 4, wherein: the method for detecting the static pressure of the water meter by the full-automatic testing device comprises the following specific steps,

firstly, inputting detection parameters to a control part (9) by a detection person;

the control part (9) closes the water inlet pipe (1) and the water outlet pipe (2), and the water inlet branch pipe (11) is opened;

thirdly, the control part (9) controls the pressurization part to gradually pressurize the water meters (4) to be detected according to preset detection parameters, in the pressurization process, the video monitoring part (91) constantly reads the numerical values of the pressure detection parts corresponding to the water meters (4) to be detected and feeds the numerical values back to the control part (9), the control part (9) judges whether the obvious pressure reduction condition exists or the long-time pressure non-increase condition exists, if so, the corresponding water inlet branch pipe (11) is closed, and the corresponding water meters (4) to be detected fail to pressurize; if the situation does not exist, whether the set pressure value in the detection parameters is reached is judged, and once the set pressure value is reached, the corresponding water inlet branch pipe (11) is closed to enter a pressure maintaining stage;

in the pressure maintaining process of the water meters (4) to be detected, the video monitoring part (91) constantly reads the numerical values of the pressure detection parts corresponding to the water meters (4) to be detected and feeds the numerical values back to the control part (9), the control part (9) judges whether the pressure reduction condition exceeding the preset value in the detection parameters exists or not, and if the pressure reduction condition exists, the pressure maintaining is judged to fail; if the situation does not exist, the timer time is read, and when the preset value of the pressure maintaining time in the detection parameters is reached, the pressure maintaining is successful, the water inlet pipe (1) and the water outlet pipe (2) are opened, and the detection operation is finished.

10. The fully automatic test apparatus of claim 9, wherein: in the fourth step, if all the water meters (4) to be detected enter the pressure maintaining stage or are judged to be failed in pressurization, the booster pump of the pressurization part keeps low-frequency operation.