Small-flow automatic detection device and detection method for water meters

Abstract

The invention discloses a device and a method for error detection under the conditions of small flows of water meters. According to the device, a computer is used for comprehensively controlling a detection process, calculating errors and managing test data; photoelectric sensors are used for converting rotating signals of plum-blossom needles of standard water meters and the tested water meters into electric square wave signals, and outputting the electric square wave signals to an input port of a controller; the controller is used for executing specific control action and data acquisition; a flow control part takes an output signal of a differential pressure flow sensor as a feedback signal of flow control; an error measurement part acquires the output signals of the photoelectric sensors of the standard water meters and the tested water meters; a decimal pulse counting method is adopted for the data acquisition; and acquired data is transmitted to the computer, and the computer calculates error values of the tested water meters according to the test data. By the device and the decimal pulse counting method, time for testing the water meters can be effectively shortened, so that water meter testing efficiency can be greatly improved, and a production bottleneck problem caused by low water meter testing speed in the batch production of the water meters can be solved.

Description

technical field [0001] The invention belongs to the technical field of automatic detection, and in particular relates to a detection device for a small flow error of a water meter. Background technique [0002] At present, in the detection process of the water meter, the volumetric manual detection device is mainly used, and the error is calculated mainly by comparing the difference between the indicated value of the water flowing through the measured water meter and the standard container. During the operation, the requirements for operators are high. When reading the indication value of the water meter and the indication value of the standard container, it is easy to cause human error; when the calibration flow is small, in order to reduce human error, the total flow that needs to flow Larger, longer time. For example, if the flow point of the calibration flow is 25 liters / hour, if the accumulated water volume needs to flow through reaches 10 liters, the calibration time i...

AI Technical Summary

Problems solved by technology

In the operation process, the requirements for the operator are high. When reading the indication value of the water meter and the indication value of the standard container, it is easy to cause human error; when the calibration flow is small, in order to reduce the human error, the total flow that needs to flow Larger and longer time, such as the flow point of 25 liters / hour for verification, if the accumulated water volume needs to flow through reaches 10 liters, the verification time is 24 minutes

At present, there is also an automatic water meter verification device, which uses a camera instead of manually reading the pointer data of the water meter, and processes it through image recognition technology. Each water meter to be tested requires a high-resolution camera, and the software processing is difficult. This method is too expensive to be suitable for mass production equipment

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