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CN-122016015-A - Method for rapidly detecting water meter error

CN122016015ACN 122016015 ACN122016015 ACN 122016015ACN-122016015-A

Abstract

The invention relates to the technical field of water meter detection, in particular to a method for rapidly detecting errors of a water meter, which comprises the following steps of S1, preparing a standard container with an accurate known volume and a handheld detection terminal integrated with an image acquisition unit, a data processing unit and a display unit, and S2, sealing and connecting a water inlet of the standard container with a water outlet of a water meter to be detected through a connecting pipeline, and simultaneously ensuring that an exhaust valve of the standard container is in an open state. The method for rapidly detecting the water meter error is combined with the standard container through the automatic identification of the integrated image and can be optionally matched with the linkage control of the valve, so that the reading error and timing delay caused by the traditional manual visual and manual operation are fundamentally eliminated, and the detection precision and the repeatability of the result are obviously improved. Meanwhile, the whole process is guided by the handheld terminal, so that simplification and standardization of operation are realized, single detection time is greatly shortened, and the requirements of on-site rapid and batch detection are met.

Inventors

  • HUANG JUNXIA
  • JIANG YANGFEI
  • Tong Keji

Assignees

  • 宁波智仪通能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260226

Claims (9)

  1. 1. A method for rapidly detecting errors in a water meter, comprising the steps of: S1, preparing a standard container with a precisely known volume and a handheld detection terminal integrated with an image acquisition unit, a data processing unit and a display unit; s2, the water inlet of the standard container is connected with the water outlet of the water meter to be measured in a sealing way through a connecting pipeline, and meanwhile, the exhaust valve of the standard container is ensured to be in an open state; S3, completely opening a water supply valve in front of the measured water meter, enabling water to flow through the water meter and then be injected into a standard container, and simultaneously utilizing an image acquisition unit to continuously shoot the running picture of a pointer or a character wheel of the water meter; S4, when the water level in the standard container reaches the rated capacity line, immediately closing the water supply valve and synchronously closing the exhaust valve; S5, the data processing unit analyzes the acquired image sequence in real time, and identifies and records a water quantity accumulated value V1 displayed by the water meter from the beginning to the end of water flow; s6, reading a known standard volume value V0 of the standard container; s7, the data processing unit calculates an indication error delta of the water meter according to a formula delta= (V1-V0)/V0 multiplied by 100%; s8, comparing the calculated error value delta with a preset error threshold value, and visually displaying a detection result and judging whether the error is qualified or not through a display unit.
  2. 2. The method for rapidly detecting errors of a water meter according to claim 1, wherein in the step S1, the standard container is made of transparent material, high-definition graduation marks are arranged on the outer wall of the standard container, and a pressure sensor is installed at the bottom of the standard container for assisting in judging whether the liquid level reaches a rated volume graduation line.
  3. 3. The method according to claim 1, wherein in step S3, the image acquisition unit is a high-speed camera with a shooting frame rate not lower than 30 frames/second, and the image recognition algorithm adopted by the data processing unit includes an Optical Character Recognition (OCR) technique or a pointer angle recognition technique based on template matching.
  4. 4. The method for rapidly detecting errors of a water meter according to claim 1, wherein the method further comprises a system self-checking and calibrating step of aligning an image acquisition unit of the detection terminal with a static known indication calibration plate for shooting, verifying the accuracy of the identification result, and automatically calibrating if the errors exceed the allowable range.
  5. 5. The method for rapidly detecting water meter errors according to claim 1, wherein an electrically controllable rapid opening and closing valve is arranged on the connecting pipeline, and the closing action of the valve is linked with the signal that the pressure sensor reaches the preset pressure or the manual trigger signal of an operator received by the detecting terminal, so as to realize the synchronous or micro-lag closing of the water supply valve.
  6. 6. The method according to claim 5, wherein in step S4, after closing the water supply valve, waiting for a preset stabilization time, and after the residual water flow in the connecting pipeline is completely injected into the standard container and the liquid level is stabilized, performing final frame locking of the image analysis and determination of the water level value V1.
  7. 7. The method for rapidly detecting errors in a water meter according to claim 1, further comprising a temperature compensation step of acquiring a measured water temperature through a temperature sensor arranged in the standard container or at the water inlet, wherein the data processing unit corrects the volume value V0 of the standard container to an actual volume value V0 'at the current water temperature according to the density influence of the water temperature and substitutes the actual volume value V0' into an error calculation formula.
  8. 8. The method for rapidly detecting errors of a water meter according to claim 1, wherein in step S8, the display unit displays the error δ in a manner of combining a numerical value, a percentage progress bar and a color identifier, wherein green represents passing and red represents failing, and the detection terminal has data storage and wireless transmission functions, so that the detection result, the water meter number and the time stamp information can be packaged and sent to a remote server.
  9. 9. The method for rapidly detecting errors of a water meter according to claim 1, wherein in the step S2, the connection between the connecting pipeline and the water outlet of the water meter to be detected adopts a rapid joint, a sealing ring is arranged inside the rapid joint, and a locking clamp is arranged outside the rapid joint, so that the rapid joint is suitable for water meter outlets with different calibers.

Description

Method for rapidly detecting water meter error Technical Field The invention relates to the technical field of water meter detection, in particular to a method for rapidly detecting errors of a water meter. Background The detection of the water meter indication error is a key link for ensuring the fairness of trade settlement and the accuracy of water resource measurement. At present, common on-site detection methods are mainly classified into a standard container method and a standard meter method. The standard container method is characterized in that water flowing out of a water meter is led into a container with a pre-calibrated volume, the water meter reading is compared with the actual volume of the container to calculate an error, the principle of the method is visual, but the traditional operation depends on manual visual reading, manual timing and valve closing, the efficiency is low, and the method is easily interfered by human factors. The other standard meter rule connects the water meter to be measured with a high-precision standard water meter in series, and compares the accumulated flow of the two water meters. However, the above prior art, particularly the most widely used conventional standard container method, has a significant disadvantage in that the accuracy and efficiency of the detection process is severely dependent on the skill and responsibility of the operator. The moment when the water level reaches the scale mark is judged manually, the visual delay and the subjective difference exist, the action of manually closing the valve cannot be completely synchronized, and random timing errors and operation errors which are difficult to quantify are introduced in the two links. In addition, the manual recording of the readings of the mechanical pointer or the character wheel of the water meter is easy to generate misreading or estimated reading deviation. Together, the factors cause poor repeatability of the measurement results of the traditional method, the whole detection process consumes long time, and the urgent requirement of the water supply industry on rapid and batch field detection of a large number of water meters is difficult to meet. To solve the above problems, we propose a method for rapidly detecting the errors of the water meter. Disclosure of Invention In order to solve the technical problems, the invention provides the following technical scheme: the invention provides a method for rapidly detecting errors of a water meter, which comprises the following steps: S1, preparing a standard container with a precisely known volume and a handheld detection terminal integrated with an image acquisition unit, a data processing unit and a display unit; s2, the water inlet of the standard container is connected with the water outlet of the water meter to be measured in a sealing way through a connecting pipeline, and meanwhile, the exhaust valve of the standard container is ensured to be in an open state; S3, completely opening a water supply valve in front of the measured water meter, enabling water to flow through the water meter and then be injected into a standard container, and simultaneously utilizing an image acquisition unit to continuously shoot the running picture of a pointer or a character wheel of the water meter; S4, when the water level in the standard container reaches the rated capacity line, immediately closing the water supply valve and synchronously closing the exhaust valve; S5, the data processing unit analyzes the acquired image sequence in real time, and identifies and records a water quantity accumulated value V1 displayed by the water meter from the beginning to the end of water flow; s6, reading a known standard volume value V0 of the standard container; s7, the data processing unit calculates an indication error delta of the water meter according to a formula delta= (V1-V0)/V0 multiplied by 100%; s8, comparing the calculated error value delta with a preset error threshold value, and visually displaying a detection result and judging whether the error is qualified or not through a display unit. In step S1, the standard container is made of transparent material, the outer wall of the standard container is provided with high-definition graduation marks, and the bottom of the standard container is provided with a pressure sensor for assisting in judging whether the liquid level reaches the rated volume graduation line. As a preferred technical solution of the present invention, in step S3, the image capturing unit is a high-speed camera, the capturing frame rate of which is not less than 30 frames/second, and the image recognition algorithm adopted by the data processing unit includes an Optical Character Recognition (OCR) technique or a pointer angle recognition technique based on template matching. As a preferable technical scheme of the invention, before the step S3 is started, the method further comprises a system self-checking and calibrating step, wher