A fully automatic testing device for water meter static pressure

Abstract

A fully automatic test device for the static pressure of a water meter comprises a clamping part, a pressurizing part, a pressure detection part, a control part, and a video monitoring part capable of recording the detection process and detection time of the static pressure of the water meter to be detected. The control part is connected to the clamping part, the pressurizing part, and the pressure detection part through lines respectively. The clamping part, the pressurizing part, and the pressure detection part are connected to a water tank through a pipeline to form a water circuit. The clamping part is composed of N clamping mechanisms arranged in parallel and capable of being connected to the water meter to be detected respectively. Each clamping mechanism is connected to a corresponding pressure detection part respectively. The pressurizing part is connected to the clamping mechanism through a respective switch valve, and the video monitoring part is connected to the control part through lines. The advantages of the present invention are: high test efficiency, good effect, independent and separately detected water meters to be tested, low false detection rate, and high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of pressure testing device manufacturing, in particular to a fully automatic testing device for the static pressure of a water meter. Background Art

[0002] With the alignment of national water meter standards with international water meter standards in recent years, new versions of water meter metrological verification procedures, type evaluation outlines, product quality supervision and random inspection implementation specifications, and evaluation rules have been launched one after another. At present, the water meter pressure test platforms used by domestic water meter testing institutions and water meter manufacturers cannot meet the requirements of new standards, procedures, and specifications, and there are a series of problems.

[0003] There is a Chinese invention patent application with application number CN201510449725.3 and titled "A Calibration Device for Fluid Metering Instruments", which discloses a calibration device for fluid metering instruments, which consists of a pressure stabilization device, a flow rate adjustment device and at least one sampling timing unit; the detection fluid is pressurized by the pressure stabilization device and passes through the detection pipeline, flows through at least one meter to be tested in turn, the flow rate adjustment device, and finally flows out of the detection pipeline; each meter to be tested is installed with a pulse time difference calibration unit; the flow rate adjustment device and the sampling timing unit are connected through a data communication line. The invention proposes a flow meter calibration method that is more suitable for the use of electronic technology, thereby improving the automation of the calibration device, increasing the calibration speed, and reducing the calibration cost. It can not only be used for water meter calibration, but also for gas meters, oil meters, liquid flow meters, gas flow meters and other calibration devices for flow meters. However, when the calibration device is used to detect multiple water meters, the water pressure and flow rate in different water meters will have an impact on each water meter. If one of the water meters being tested fails or is damaged, other water meters to be tested may require a second measurement, resulting in a misjudgment of whether the water meter product is qualified or not. Therefore, the structure of the calibration device needs to be further improved. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a fully automatic testing device for the static pressure of water meters with high testing efficiency and good effect, independent and separate detection of water meters to be tested, low false detection rate and high degree of automation in response to the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: the fully automatic testing device for the static pressure of a water meter comprises a clamping part capable of locating a water meter to be tested, a pressurizing part capable of changing the water pressure in the water meter to be tested, a pressure detecting part capable of detecting the static pressure of the water meter on the water meter to be tested, and a control part capable of realizing automatic detection of the static pressure of the water meter, wherein the control part is respectively connected to the clamping part, the pressurizing part, and the pressure detecting part through lines, and the clamping part, the pressurizing part, and the pressure detecting part are connected to a water tank through a pipeline to form a water circuit, characterized in that the clamping part is composed of N clamping mechanisms arranged in parallel and capable of being connected to the water meter to be tested respectively, each clamping mechanism is respectively connected to a corresponding pressure detecting part, and the pressurizing part is connected to the clamping mechanism through a respective switch valve, and the fully automatic testing device also comprises a video monitoring part capable of respectively recording the detection process and detection time of the static pressure of the water meter on the water meter to be tested, and the video monitoring part is connected to the control part through lines, and N is a natural number greater than 1.

[0006] As an improvement, the meter clamping mechanism includes a water inlet pipe that can be connected to the water inlet of the water meter to be tested, a water inlet branch pipe and a water outlet pipe that can be connected to the water outlet of the water meter to be tested. The water inlet branch pipe is arranged in parallel with the water inlet pipe, and switch valves that can open and close the corresponding pipelines are respectively provided on the water inlet pipe, the water inlet branch pipe and the water outlet pipe, and N pressure detection parts are arranged on the water outlet pipe between the corresponding water meter to be tested and the switch valve.

[0007] As a further improvement, the switch valve is a pneumatic ball valve capable of realizing rapid opening and closing of the corresponding pipeline, and each water inlet branch pipe is also connected in series with a manual valve capable of manually opening and closing the corresponding water inlet branch pipe.

[0008] As a further improvement, a pipe clamp is provided between the pressure detection portion and the corresponding water meter to be detected.

[0009] As an improvement, the clamping part, the boosting part, the pressure detection part and the control part are installed on the same frame, the pressure detection part is a pressure detection gauge, the pressure value display surface of the pressure detection gauge is located on the outer surface of the frame, and the video monitoring part includes a camera that can identify the pressure value on the pressure value display surface and feed back the value to the control part.

[0010] As a further improvement, the frame is a fully enclosed machine housing, the meter clamping part, the boosting part, and the pressure detection part are all arranged in the machine housing, the control part is arranged on the machine housing, and a sliding door mechanism capable of connecting and removing the water meter to be detected is arranged on the upper part of the machine housing.

[0011] As an improvement, the boosting part is a boosting pump, on which a frequency converter capable of controlling the input water pressure is provided, the frequency converter is connected to the control part, and a pipeline switch control valve and an initial water pressure measuring gauge are provided on the connecting pipeline between the boosting pump and the clamping part.

[0012] As a further improvement, there are two boost pumps, a first boost pump and a second boost pump are arranged in parallel, and the power of the second boost pump is greater than the power of the first boost pump.

[0013] As an improvement, the specific steps for detecting the static pressure of the water meter by the fully automatic testing device are as follows:

[0014] 1. The testing personnel input the testing parameters into the control unit;

[0015] 2. The control unit closes the water inlet pipe and the water outlet pipe, and the water inlet branch pipe is opened;

[0016] 3. The control unit controls the pressurization unit to smoothly increase the pressure on the water meter to be detected according to the preset detection parameters. During the pressurization process, the video monitoring unit always reads the value of the pressure detection unit corresponding to each water meter to be detected and feeds it back to the control unit. The control unit determines whether there is a significant pressure drop or a long-term pressure no pressure increase. If there is such a situation, the corresponding water inlet branch pipe is closed, and the corresponding water meter to be detected fails to be pressurized; if there is no such situation, it is determined whether the set pressure value in the detection parameter is reached. Once the set pressure value is reached, the corresponding water inlet branch pipe is closed to enter the pressure maintenance stage;

[0017] 4. During the pressure maintenance process of the water meter to be tested, the video monitoring unit constantly reads the value of the pressure detection unit corresponding to each water meter to be tested and feeds it back to the control unit. The control unit determines whether there is a pressure drop exceeding the preset value in the detection parameter. If so, it is determined that the pressure maintenance has failed; if there is no such situation and the timer time is read, when the preset value of the pressure maintenance time in the detection parameter is reached, the pressure maintenance is successful, the water inlet and outlet pipes are opened, and the detection operation is ended.

[0018] As a further improvement, in step 4, if all water meters to be tested have entered the pressure maintaining stage or have been judged to have failed in the pressurization, the booster pump of the pressurization unit maintains low-frequency operation.

[0019] Compared with the prior art, the advantages of the present invention are: the device innovatively adopts a parallel pipeline structure to perform static pressure tests on multiple water meters to be tested at the same time, breaking the original series connection mode of traditional water meter pressure-resistant devices, eliminating the defects of mutual influence among the water meters to be tested during the test, ensuring the accuracy and reliability of the test results, and significantly improving the test efficiency; the control unit realizes automatic testing of the device, and can accurately pressurize, maintain pressure, and release pressure on multiple water meters to be tested according to the set pressure value and time value, and record the pressure value of the whole process to give a curve graph; the video monitoring unit records the test process of the test site and the status of the water meters to be tested, key pressure data and other video image data in real time, and saves them in the control software for easy retrieval and management. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of pipeline and line connections according to an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A stereoscopic diagram showing a pipe connection structure is shown in FIG.

[0022] Figure 3 yes Figure 1 A cross-sectional view of another supercharging method;

[0023] Figure 4 yes Figure 3 Schematic diagram of the structure;

[0024] Figure 5 yes Figure 4 Side projection of

[0025] Figure 6 yes Figure 4 Front projection of the middle structure installed in the rack;

[0026] Figure 7 yes Figure 1 Schematic diagram of the application process of the detection device;

[0027] Figure 8 yes Figure 1 Flow chart of the control software in the controller. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below with reference to the accompanying drawings.

[0029] like Figure 1 to Figure 2 as well as Figure 7 As shown, the fully automatic test device for the static pressure of a water meter in this embodiment includes a clamping portion capable of locating the water meter 4 to be tested, a pressurizing portion capable of changing the water pressure in the water meter 4 to be tested, a pressure detecting portion capable of detecting the static pressure of the water meter on the water meter 4 to be tested, and a control portion 9 capable of realizing automatic detection of the static pressure of the water meter. The control portion 9 is respectively connected to the clamping portion, the pressurizing portion, and the pressure detecting portion through lines. The clamping portion, the pressurizing portion, and the pressure detecting portion are connected to the water tank 6 through pipelines to form a water circuit. The clamping portion is composed of N clamping mechanisms that are arranged in parallel and can be connected to the water meter 4 to be tested respectively. Each clamping mechanism is respectively connected to a corresponding pressure detecting portion. The pressurizing portion is connected to the clamping mechanism through a respective switch valve. The fully automatic test device also includes a video monitoring portion 91 capable of respectively recording the detection process and detection time of the static pressure of the water meter on the water meter 4 to be tested. The video monitoring portion 91 is connected to the control portion 9 through lines, and N is a natural number greater than 1.

[0030] The meter clamping mechanism includes an inlet pipe 1 that can be connected to the water inlet of the water meter 4 to be tested, a water inlet branch pipe 11, and a water outlet pipe 2 that can be connected to the water outlet of the water meter 4 to be tested. The water inlet branch pipe 11 is arranged in parallel with the water inlet pipe 1. Switch valves that can open and close the corresponding pipelines are respectively arranged on the water inlet pipe 1, the water inlet branch pipe 11, and the water outlet pipe 2. N pressure detection parts are arranged on the outlet pipe 2 between the corresponding water meter 4 to be tested and the switch valve. The switch valve is a pneumatic ball valve 3 that can realize the rapid opening and closing of the corresponding pipeline. A manual valve 30 that can manually open and close the corresponding water inlet branch pipe 11 is also connected in series on each water inlet branch pipe 11. A pipeline clamp 12 is arranged between the pressure detection part and the corresponding water meter 4 to be tested.

[0031] The clamping part, the pressurizing part, the pressure detection part and the control part 9 are installed on the same frame 7. The pressure detection part is a pressure detection meter 5. The pressure value display surface of the pressure detection meter 5 is located on the outer surface of the frame 7. The video monitoring part 91 includes a camera that can identify the pressure value on the pressure value display surface and feed the value back to the control part 9. The frame 7 is a fully enclosed machine body. The clamping part, the pressurizing part and the pressure detection part are all arranged in the machine body. The control part 9 is arranged on the machine body. A sliding door mechanism 71 that can access and remove the water meter 4 to be tested is arranged on the upper part of the machine body. The specific structure of the sliding door mechanism 71 belongs to the known technology, so it will not be described in detail. The specific circuit structure of the circuit module adopted by the video monitoring part 91 belongs to the known technology, so it will not be described in detail. The specific circuit structure of the control part 9 belongs to the existing technology, so it will not be described in detail. The boosting part is a boosting pump, i.e., the first boosting pump 81 shown in FIG2 . A frequency converter capable of controlling the input water pressure is provided on the boosting pump. The frequency converter is connected to the control part 9 . A pipeline switch control valve and an initial water pressure measuring meter are provided on the connecting pipeline between the boosting pump and the clamping part.

[0032] The specific steps of testing the static pressure of the water meter by this fully automatic testing device are:

[0033] 1. The testing personnel input the testing parameters into the control unit 9;

[0034] 2. The control unit 9 closes the water inlet pipe 1 and the water outlet pipe 2, and the water inlet branch pipe 11 is opened;

[0035] 3. The control unit 9 controls the pressurizing unit to smoothly increase the pressure on the water meter 4 to be detected according to the preset detection parameters. During the pressurizing process, the video monitoring unit 91 reads the value of the pressure detection unit corresponding to each water meter 4 to be detected at all times and feeds it back to the control unit 9. The control unit 9 determines whether there is a significant pressure drop or a long-term pressure no pressure increase. If so, the corresponding water inlet branch pipe 11 is closed, and the corresponding water meter 4 to be detected fails to be pressurized; if not, it is determined whether the set pressure value in the detection parameter is reached. Once the set pressure value is reached, the corresponding water inlet branch pipe 11 is closed to enter the pressure holding stage;

[0036] 4. During the pressure maintaining process of the water meter 4 to be tested, the video monitoring unit 91 constantly reads the value of the pressure detection unit corresponding to each water meter 4 to be tested and feeds it back to the control unit 9. The control unit 9 determines whether there is a pressure drop exceeding the preset value in the detection parameter. If so, it is determined that the pressure maintaining has failed. If there is no such situation and the timer time is read, when the preset value of the pressure maintaining time in the detection parameter 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 ended.

[0037] In step 4, if all water meters 4 to be tested enter the pressure holding stage or are judged to have failed to pressurize, the booster pump of the boosting unit maintains low-frequency operation. The detection parameters include the preset value of the pressure holding time, the average boosting rate of the gentle boosting, the minimum pressure value of the pressure detection unit during pressure holding, and the boosting pressure value. The detection parameters may also include detection environment parameters, such as air humidity, indoor temperature, indoor air pressure and other data.

[0038] Figure 1 The dotted lines in the figure indicate that the video monitoring unit monitors the situations of the parts corresponding to the dotted lines in real time through the cameras, and feeds back the information to the control unit 9 in a timely manner.

[0039] The control part of this device adopts computer control software, which runs on a brand machine and cooperates with the PLC controller to realize the automatic management of the entire device, including pressurization, pressure maintenance, and pressure relief process control; result judgment; data storage and other inspection and testing functions, as well as the export and printing of result data. The pipeline switch control valve also adopts a pneumatic ball valve 3, and the initial water pressure measurement meter has the same structure as the pressure detection meter 5.

[0040] like Figure 1 , Figure 3 Until Figure 8 As shown, the fully automatic testing device for the static pressure of a water meter of the second embodiment includes a clamping portion capable of locating the water meter 4 to be tested, a pressurizing portion capable of changing the water pressure in the water meter 4 to be tested, a pressure detecting portion capable of detecting the static pressure of the water meter on the water meter 4 to be tested, and a control portion 9 capable of realizing automatic detection of the static pressure of the water meter. The control portion 9 is respectively connected to the clamping portion, the pressurizing portion, and the pressure detecting portion through lines. The clamping portion, the pressurizing portion, and the pressure detecting portion are connected to the water tank 6 through pipelines to form a water circuit. The clamping portion is composed of N clamping mechanisms arranged in parallel and capable of being connected to the water meter 4 to be tested respectively. Each clamping mechanism is respectively connected to a corresponding pressure detecting portion. The pressurizing portion is connected to the clamping mechanism through a respective switch valve. The fully automatic testing device also includes a video monitoring portion 91 capable of respectively recording the detection process and detection time of the static pressure of the water meter on the water meter 4 to be tested. The video monitoring portion 91 is connected to the control portion 9 through lines, and N is a natural number greater than 1.

[0041] The meter clamping mechanism includes an inlet pipe 1 that can be connected to the water inlet of the water meter 4 to be tested, a water inlet branch pipe 11, and a water outlet pipe 2 that can be connected to the water outlet of the water meter 4 to be tested. The water inlet branch pipe 11 is arranged in parallel with the water inlet pipe 1. Switch valves that can open and close the corresponding pipelines are respectively arranged on the water inlet pipe 1, the water inlet branch pipe 11, and the water outlet pipe 2. N pressure detection parts are arranged on the outlet pipe 2 between the corresponding water meter 4 to be tested and the switch valve. The switch valve is a pneumatic ball valve 3 that can realize the rapid opening and closing of the corresponding pipeline. A manual valve 30 that can manually open and close the corresponding water inlet branch pipe 11 is also connected in series on each water inlet branch pipe 11. A pipeline clamp 12 is arranged between the pressure detection part and the corresponding water meter 4 to be tested.

[0042] The clamping part, the pressurizing part, the pressure detection part and the control part 9 are installed on the same frame 7. The pressure detection part is a pressure detection meter 5. The pressure value display surface of the pressure detection meter 5 is located on the outer surface of the frame 7. The video monitoring part 91 includes a camera that can identify the pressure value on the pressure value display surface and feed the value back to the control part 9. The frame 7 is a fully enclosed machine body. The clamping part, the pressurizing part and the pressure detection part are all arranged in the machine body. The control part 9 is arranged on the machine body. A sliding door mechanism 71 that can access and remove the water meter 4 to be tested is arranged on the upper part of the machine body. The specific structure of the sliding door mechanism 71 belongs to the known technology, so it will not be described in detail. The specific circuit structure of the circuit module adopted by the video monitoring part 91 belongs to the known technology, so it will not be described in detail. The specific circuit structure of the control part 9 belongs to the existing technology, so it will not be described in detail.

[0043] The boosting part is a boosting pump, on which a frequency converter capable of controlling the input water pressure is arranged, the frequency converter is connected to the control part 9, and a pipeline switch control valve and an initial water pressure measuring meter are arranged on the connecting pipe between the boosting pump and the clamping part. There are two boosting pumps, the first boosting pump 81 and the second boosting pump 82 are arranged in parallel, and the power of the second boosting pump 82 is greater than the power of the first boosting pump 81. Usually, the specification of the first boosting pump 81 is that it can provide a water pressure of 2.5Mpa, and the specification of the second boosting pump 82 is that it can provide a water pressure of 4Mpa. The second boosting pump 82 is connected to the water inlet branch pipe 11, and the first boosting pump 81 is connected to the water inlet pipe 1. By switching the corresponding switch valve, the corresponding pipeline is opened and closed.

[0044] The specific steps of testing the static pressure of the water meter by this fully automatic testing device are:

[0045] 1. The testing personnel input the testing parameters into the control unit 9;

[0046] 2. The control unit 9 closes the water inlet pipe 1 and the water outlet pipe 2, and the water inlet branch pipe 11 is opened;

[0047] 3. The control unit 9 controls the pressurizing unit to smoothly increase the pressure on the water meter 4 to be detected according to the preset detection parameters. During the pressurizing process, the video monitoring unit 91 reads the value of the pressure detection unit corresponding to each water meter 4 to be detected at all times and feeds it back to the control unit 9. The control unit 9 determines whether there is a significant pressure drop or a long-term pressure no pressure increase. If so, the corresponding water inlet branch pipe 11 is closed, and the corresponding water meter 4 to be detected fails to be pressurized; if not, it is determined whether the set pressure value in the detection parameter is reached. Once the set pressure value is reached, the corresponding water inlet branch pipe 11 is closed to enter the pressure holding stage;

[0048] 4. During the pressure maintaining process of the water meter 4 to be tested, the video monitoring unit 91 constantly reads the value of the pressure detection unit corresponding to each water meter 4 to be tested and feeds it back to the control unit 9. The control unit 9 determines whether there is a pressure drop exceeding the preset value in the detection parameter. If so, it is determined that the pressure maintaining has failed. If there is no such situation and the timer time is read, when the preset value of the pressure maintaining time in the detection parameter 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 ended.

[0049] In step 4, if all water meters 4 to be tested enter the pressure holding stage or are judged to have failed to pressurize, the booster pump of the boosting unit maintains low-frequency operation. The detection parameters include the preset value of the pressure holding time, the average boosting rate of the gentle boosting, the minimum pressure value of the pressure detection unit during pressure holding, and the boosting pressure value. The detection parameters may also include detection environment parameters, such as air humidity, indoor temperature, indoor air pressure and other data.

[0050] Figure 1 The dotted lines in the figure indicate that the video monitoring unit monitors the situations of the parts corresponding to the dotted lines in real time through the cameras, and feeds back the information to the control unit 9 in a timely manner.

[0051] The control part of this device adopts computer control software, which runs on a brand machine and cooperates with the PLC controller to realize the automatic management of the entire device, including pressurization, pressure maintenance, and pressure relief process control; result judgment; data storage and other inspection and detection functions, as well as the export and printing of result data. The pipeline switch control valve also adopts a pneumatic ball valve 3, and the initial water pressure measurement meter has the same structure as the pressure detection meter 5.

[0052] Working principle: This device adopts a parallel structure design to realize independent automatic testing of the static pressure of three water meters at the same time, which improves the detection efficiency; it adopts automatic pressure control technology to realize the linkage control of test pressure and test timing, ensuring the accuracy of detection parameters and the consistency of the inspection process; it adopts video monitoring technology to realize the whole process monitoring of the static pressure test of water meters, ensuring the traceability of the test results.

[0053] The test device developed by the present invention, on the one hand, can fully meet the technical requirements for static pressure testing in the latest version of the national standard for water meters, water meter verification procedures, product quality supervision and random inspection implementation specifications, and evaluation rules, and can independently test multiple water meters under inspection at the same time without affecting each other. The entire test process can be automatically completed by computer control, and has a video recording function. The whole set of devices has a high degree of automation, high detection efficiency, and reliable detection results. On the other hand, the successful development of the device will greatly improve the detection capabilities of cold water meters in our institute and our center, solve the defects existing in the original static pressure test of water meters, eliminate the hidden dangers of inspection work, and lay a solid foundation for the smooth implementation of the subsequent national, provincial, municipal, and county water meter supervision and random inspection tasks. Therefore, the parallel fully automatic water meter static pressure test device developed by this project can not only fully meet the requirements of water meter standards, procedures, and specifications, and provide notarized and reliable detection data for the society, but also can change the design concept of water meter static pressure test devices, eliminate the hidden dangers of static pressure testing, and improve the reliability of our institute's water meter inspection results.

[0054] This device is mainly used in the static pressure test of cold water meters of DN40 and below.

[0055] The process structure of this device is improved on the basis of the traditional water meter static pressure test device, which mainly includes two aspects:

[0056] 1. Structural improvements:

[0057] ⑴Parallel structure

[0058] Traditional water meter static pressure test devices usually use single-unit detection or series detection, and their test pipelines are usually in series structure. Although multi-meter series detection can improve the detection efficiency of static pressure test, there are great hidden dangers in the detection process. Once one of the tested meters leaks or bursts, the pressure will drop immediately and cannot reach the test pressure. Other water meters will not be able to continue the test, which will affect the determination of the static pressure test results of other water meters. This device designs the test pipeline into a parallel structure. Each tested water meter has its own independent static pressure test pipeline, which is controlled by valves and does not affect each other. However, their pressure source comes from the same pump, and the same pump pressurizes the three parallel pipelines at the same time. Once a tested meter leaks or bursts, the valve of the test pipeline will be closed without affecting the other pipelines. The parallel structure not only maintains the advantages of the series structure that can perform static pressure tests on multiple water meters at the same time and has high detection efficiency, but also solves the problem of the series structure that once one of the tested meters leaks or bursts, it affects the determination of the test results of other water meters, ensuring the reliability of the test results.

[0059] ⑵ The variable frequency pump replaces the additional pump

[0060] Traditional water meter static pressure test devices usually use additional pumps to control the test pressure by manually adjusting the valve opening by the test personnel. This method has high requirements for operators. Once the test personnel operate improperly, such as increasing the pressure too fast or too slow, inaccurate pressure control, etc., the test results will be unreliable and misjudgment will occur. This device combines ordinary water pumps and frequency converters. The computer adjusts the frequency converter according to the parameters set by the test personnel, thereby automatically controlling the size of the water pump output pressure. In the test process, it can perform actions such as increasing pressure, stabilizing pressure, regulating pressure, and shutting down according to the pressure value fed back by the pressure transmitter, so that the entire static pressure test process is fully automated without any manual operation, which well ensures the consistency of parameters in each static pressure test process and the reliability of the test results.

[0061] 2. Pressure automatic control strategy

[0062] The pressure automatic control strategy is the core and key to the automatic detection of the water meter static pressure test device. Through the design of the pressure control strategy, the three water meters distributed in the parallel pipeline can share the same pressure source to perform static pressure tests separately without interfering with each other, and can give corresponding processing and scheduling according to different situations generated during the detection process, making the entire detection process accurate, reliable, safe, and highly automated and intelligent. The specific process of strategy design can be seen in Figure 7 .

[0063] First, the test personnel input the necessary parameters such as the test pressure and pressure holding time through the control software to start the test; the upstream water inlet valve and downstream valve of each water meter under test are closed, and the upstream bypass valve is opened; the frequency converter drives the water pump to increase the pressure smoothly according to the pre-set parameters; during the pressure increase process, read the values ​​of each pressure transmitter at all times to determine whether there is a significant pressure drop or a long-term pressure does not increase. If so, close the upstream bypass valve of the corresponding water meter under test, and the pressure increase of the water meter under test fails; if not, determine whether the set pressure value is reached. Once the test pressure is reached, close the upstream bypass valve of the corresponding water meter under test and enter the pressure holding stage; if all water meters under test enter the pressure holding process or have been judged as pressure increase failure, the water pump can maintain low-frequency operation. During the pressure holding process, read the values ​​of each pressure transmitter at all times to determine whether there is a pressure drop exceeding the preset value. If so, it is judged as pressure holding failure; if there is no such situation and the timer reading time reaches the preset value of the pressure holding time, the pressure holding is successful, open the downstream valve and the upstream water inlet valve, and end this test.

[0064] The control unit of this device adopts computer control software, which runs on a brand machine and cooperates with the PLC controller to realize the automatic management of the entire device, including pressurization, pressure maintenance, and pressure relief process control; result judgment; data storage and other inspection and testing functions, as well as the export and printing of result data.

[0065] The software interface is designed according to the hardware arrangement position and detection process, which conforms to the specific detection process and is intuitive and clear; the operation is reasonably designed, information input is convenient, the hardware responds quickly, and it is simple and easy to use. For details of the software design process, see Figure 8 . Figure 8 The circulation valve in is the switch valve on the water outlet pipe 2.

[0066] This project focuses on solving the following problems:

[0067] 1. Eliminate the defects of traditional static pressure test

[0068] When the traditional serial static pressure test device conducts static pressure tests on three water meters at the same time, if one meter leaks or bursts, it will affect the judgment of the test results of the other two meters. Therefore, how to ensure that the device developed in this project can eliminate the defects of the traditional static pressure test is the first problem to be solved;

[0069] 2. Improve detection efficiency

[0070] Since this device is mainly used for supervision and spot checks of water meters at all levels and static pressure tests of water meters commissioned by enterprises, most of these commissions are characterized by heavy tasks, tight time and long time consumption, which poses a severe challenge to the detection efficiency of the device. How to improve the static pressure detection efficiency of water meters under the premise of strictly implementing the detection standards is a key issue;

[0071] 3. Ensure the accuracy of test parameters and consistency of the test process

[0072] Since the traditional water meter static pressure test process requires manual adjustment of valves for pressure increase and pressure relief, and timing at the same time, it cannot guarantee the accuracy of the test parameters and the consistency of the test process. Human factors have a huge impact, which may cause deviations in the test results. Therefore, the accuracy of the test parameters and the consistency of the test process are very important. Only by ensuring the accuracy of the parameters and consistent execution throughout the test process and minimizing human factors can the test results be accurate and reliable.

[0073] 4. Ensure the accuracy, reliability and traceability of test results

[0074] The implementation specifications for quality supervision and random inspections of water meter products stipulate: "Visual recording should be carried out during the static pressure test, and the sample number information, pressure instrument indications and result phenomena of the test process should be continuously recorded." This requires that the water meter static pressure test device should have an automatic video recording function to ensure the accuracy, reliability and traceability of the test results.

[0075] The innovation of this device:

[0076] 1. Parallel piping structure

[0077] This device innovatively adopts a parallel pipeline structure to perform static pressure tests on three water meters at the same time, breaking the original series connection mode of traditional water meter pressure-resistant devices and eliminating the defects of mutual influence of each water meter during the test. It not only ensures the accuracy and reliability of the test results, but also significantly improves the test efficiency.

[0078] 2Automated pressure control system

[0079] This device is innovatively equipped with an automated pressure control system to achieve fully automatic water meter static pressure test items. It can accurately pressurize, maintain pressure, and release pressure on the three inspected water meters according to the set pressure values ​​and time values, and record the pressure values ​​of the entire process and provide a curve graph.

[0080] 3. Video Recording System

[0081] The device is equipped with a video recording system that can record the testing process at the test site, as well as video images such as the status of the water meter being tested and key pressure data in real time, and save them in the control software for easy retrieval and management.

[0082] 4 Protective facilities

[0083] During the static pressure test, due to the high test pressure, if the water meter being tested is not pressure-resistant, it is prone to leakage, water seepage, etc. In extreme cases, the case and dial glass may burst, not only water will spray out, but glass, plastic, metal and other parts may also splash out, which may easily cause personal injury. This device is equipped with protective facilities to effectively prevent such situations from occurring.

[0084] In summary, this device is designed according to the requirements of national standards for water meters, water meter calibration procedures, and water meter product quality supervision and random inspection implementation specifications. It is improved on the basis of traditional static pressure test devices, and adopts a parallel pipeline structure to eliminate the defects of the traditional series static pressure test device in which the tested water meters influence each other during the test; it is equipped with a fully automatic pressure control system to reduce the influence of human operation and ensure the accuracy of the test parameters and the consistency of the test process; it is equipped with a video recording system to comprehensively record the entire test process to ensure the accuracy, reliability and traceability of the test results.

Claims

1. An application method of a fully automatic testing device for the static pressure of a water meter, the fully automatic testing device comprising a clamping portion capable of positioning a water meter (4) to be tested, a pressurizing portion capable of changing the water pressure in the water meter (4) to be tested, a pressure detecting portion capable of 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, the control portion (9) being connected to the clamping portion, the pressurizing portion, and the pressure detecting portion through lines, respectively, the clamping portion, the pressurizing portion, and the pressure detecting portion being connected to a water tank (6) through a pipeline to form a water circuit, characterized in that: The meter clamping part is composed of N meter clamping mechanisms arranged in parallel and capable of being connected to the water meter (4) to be tested, each meter clamping mechanism is connected to a corresponding pressure detection part, and the pressurizing part is connected to the meter clamping mechanism via a respective switch valve. The fully automatic testing device also includes a video monitoring part (91) capable of recording the detection process and detection time of the static pressure size of the water meter (4) to be tested, and the video monitoring part (91) is connected to the control part (9) via a line. N is a natural number greater than 1. The meter clamping mechanism includes a pressure detection part capable of being connected to the water meter to be tested. (4) a water inlet pipe (1) connected to the water inlet, a water inlet branch pipe (11) and a water outlet pipe (2) capable of being connected to the water outlet of the water meter (4) to be tested, wherein the water inlet branch pipe (11) is arranged in parallel with the water inlet pipe (1), and switch valves capable of opening and closing corresponding pipes 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 corresponding water meter (4) to be tested and the switch valve; characterized in that: the specific steps of detecting the static pressure of the water meter by the full-automatic testing device are as follows:

1. The testing personnel input the testing parameters into the control unit (9); 2. The control unit (9) closes the water inlet pipe (1) and the water outlet pipe (2), and the water inlet branch pipe (11) is opened; 3. The control unit (9) controls the pressure increasing unit to smoothly increase the pressure on the water meter (4) to be detected according to the preset detection parameters. During the pressurization process, the video monitoring unit (91) constantly reads the value of the pressure detection unit corresponding to each water meter (4) to be detected and feeds it back to the control unit (9). The control unit (9) determines whether there is a significant pressure drop or a long period of no pressure increase. If so, the corresponding water inlet branch pipe (11) is closed and the corresponding water meter (4) to be detected fails to be pressurized. If not, it is determined whether the set pressure value in the detection parameter is reached. Once the set pressure value is reached, the corresponding water inlet branch pipe (11) is closed and the pressure maintenance stage is entered. Fourth, during the pressure maintenance process of the water meter (4) to be tested, the video monitoring unit (91) constantly reads the value of the pressure detection unit corresponding to each water meter (4) to be tested and feeds it back to the control unit (9). The control unit (9) determines whether there is a pressure drop exceeding the preset value in the detection parameter. If there is such a situation, it is determined that the pressure maintenance has failed. If there is no such situation and the timer time is read, when the preset value of the pressure maintenance time in the detection parameter is reached, the pressure maintenance is successful, the water inlet pipe (1) and the water outlet pipe (2) are opened, and the detection operation is ended.

2. The application method according to claim 1, characterized in that: In step 4, if all the water meters (4) to be tested have entered the pressure maintaining stage or have been judged to have failed in the pressure boosting, the boosting pump of the pressure boosting unit maintains low-frequency operation.

3. The application method according to claim 1, characterized in that: The switch valve is a pneumatic ball valve (3) capable of realizing rapid opening and closing of the corresponding pipeline, and each water inlet branch pipe (11) is also connected in series with a manual valve (30) capable of manually opening and closing the corresponding water inlet branch pipe (11).

4. The application method according to claim 1, characterized in that: A pipe clamp (12) is provided between the pressure detection portion and the corresponding water meter (4) to be detected.

5. The application method according to any one of claims 1 to 4, characterized in that: The clamping section, the pressurizing section, the pressure detection section and the control section (9) are installed on the same frame (7); the pressure detection section is a pressure detection gauge (5); the pressure value display surface of the pressure detection gauge (5) is located on the outer surface of the frame (7); and the video monitoring section (91) includes a camera capable of identifying the pressure value on the pressure value display surface and feeding back the value to the control section (9).

6. The application method according to claim 5, characterized in that: The frame (7) is a fully enclosed housing; the meter clamping part, the pressure boosting part, and the pressure detection part are all arranged inside the housing; the control part (9) is arranged on the housing; and a sliding door mechanism (71) capable of inserting and removing the water meter (4) to be detected is arranged on the upper part of the housing.

7. The application method according to any one of claims 1 to 4, characterized in that: The boosting part is a boosting pump, on which a frequency converter capable of controlling the input water pressure is arranged, the frequency converter is connected to a control part (9), and a pipeline switch control valve and an initial water pressure measuring meter are arranged on the connecting pipeline between the boosting pump and the meter clamping part.

8. The application method according to claim 7, characterized in that: There are two boosting pumps, a first boosting pump (81) and a second boosting pump (82) are arranged in parallel, and the power of the second boosting pump (82) is greater than the power of the first boosting pump (81).

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