CN219301749U - A calibration device for machine vision channel flow measurement equipment - Google Patents

Abstract

The utility model relates to the technical field of water conservancy informatization, in particular to a calibration device for machine vision channel flow measurement equipment, comprising: a flow calibration device, the flow calibration device includes an electronic balance, a tray arranged on the electronic balance, and a tray arranged on the tray The electronic balance on the platform; the channel water circulation device, the channel water circulation device includes a platform support, and an outlet pipe, a channel, a water tank, a water inlet pipe and a water pump arranged on the platform support. In the utility model, the channel water flow measurement can be carried out when the water flow is relatively stable in the channel, and the standard mass method can be used for flow calibration after the water flow flows out of the water inlet pipe. High, small size, convenient for rapid flow calibration on site, and can replace the channel flow measurement of different cross-sections to meet the different flow measurement needs of the water conservancy industry.

Description

A calibration device for machine vision channel flow measurement equipment

technical field

The utility model relates to the technical field of water conservancy informatization, in particular to a calibration device for machine vision channel flow measurement equipment.

Background technique

With the rapid development of information technology and image processing technology, image-based, optical and radar-based flow measurement methods are increasingly widely used, especially the image-based non-contact flow measurement method, which has gradually become a popular method for flow measurement because of its simplicity, efficiency and speed. best product. Most of the channel flow velocity estimation methods based on the image method use the target tracking algorithm to detect the moving distance of the detection buoy and the tracer particles to calculate the flow velocity on the surface of the water flow, and then obtain the cross-sectional area according to the water level, and finally calculate the flow rate. Since these devices cannot be accurately calibrated, it is imperative to develop calibration equipment.

The main methods of channel flow calibration under laboratory conditions are: 1. Standard volume method; 2. Standard mass method; 3. Standard flowmeter method; the standard mass method is to use an electronic balance to weigh the water flow into the container within a certain period of time. The quality in is measured. The high-precision electronic balance can obtain the quality of water, and the measurement time of the standard mass method can be accurately obtained by reading frame by frame based on video. Therefore, the standard mass method can be used to realize the measurement and calibration of channel water flow equipment.

In view of the above problems, this utility model designs this set of devices, which can replace channels of different cross-sections according to needs, so as to meet the needs of water flow measurement in channels of different cross-sections; realize the calibration of channel flow measurement coefficients based on machine vision, and solve the problem of machine vision technology. It is difficult to accurately calibrate the channel flow measurement of different sections. Therefore, we propose a machine vision channel flow measurement equipment calibration device.

Utility model content

The purpose of this utility model is to provide a machine vision channel flow measurement equipment calibration device to solve the problems raised in the above background technology.

In order to achieve the above purpose, the utility model provides the following technical solutions: a machine vision channel flow measurement equipment calibration device, including:

A flow calibration device, the flow calibration device includes an electronic balance, a tray arranged on the electronic balance, and an electronic balance arranged on the tray;

Wherein, the flow calibration device is to use the weighing container to obtain the quality of the water within a period of time when the water flows out of the water outlet pipe, and the weighing container is placed on the electronic balance with the tray to clear and remove the weight before use. In the process of using the weighing container to obtain the quality of water, there is no water drop overflowing, and the operation is performed under the video recording of the camera, and the time when the weighing container obtains the quality of water can be accurately obtained through the time measurement software. The electronic balance can accurately obtain the weight of water, so as to obtain the flow rate of the flow calibration device;

Channel water circulation device, said channel water circulation device includes a platform support, and outlet pipes, channels, water tanks, water inlet pipes and water pumps arranged on the platform support;

Among them, the channel flow circulation device draws water from the outlet pipe into the water inlet pipe under the operation of the water pump, and the water flow in the water inlet pipe flows into the water tank and overflows from the weir, and the overflowed water flow enters the replaceable channel;

The replaceable channels in the channel flow circulation device are operated based on the platform support. The platform support is designed according to the installation of channels with different cross-sections. According to the needs, channels of different cross-sections such as rectangle, trapezoid, and U-shape can be replaced to meet the needs of water conservancy. Industry flow measurement requirements;

A machine vision flow measurement device, the machine vision flow measurement device includes a water gauge and a corresponding machine vision flow velocity measurement system;

Among them, the machine vision flow rate measurement system is to wait for the water flow to enter the replaceable channel, and the water flow state is in a stable state. Use machine vision or a water gauge to measure the water level at this time, and obtain the surface flow velocity under the machine vision velocity measurement system. When the water level is known, the cross-sectional area of the rectangular channel at this time can be obtained, and the flow at this time can be obtained by using the water level-velocity area method.

Compared with the prior art, the beneficial effects of the utility model are:

During the measurement process, the water flow in the channel is drawn out by the water pump from the outlet of the pipeline, and pumped to the inlet pipe. After the water flow enters the water tank, it overflows into the replaceable channel through the weir, thus forming a circulation system;

During this process, the channel water flow can be measured when the water flow is relatively stable in the channel, and the standard mass method can be used for flow calibration after the water flow flows out of the water inlet pipe. High, small size, convenient for rapid flow calibration on site, and can replace the channel flow measurement of different cross-sections to meet the different flow measurement needs of the water conservancy industry.

Description of drawings

Fig. 1 is the structural representation of channel flow measuring system of the present utility model;

Fig. 2 is a schematic structural diagram of the channel flow calibration system of the present invention;

In the figure: 1. Weighing container; 2. Electronic balance; 3. Tray; 4. Outlet pipe; 5. Water gauge; 6. Machine vision speed measurement system; 7. Replaceable channel; 8. Water tank; ; 10, weir mouth; 11, water pump; 12, platform support.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

As shown in Figure 1 and Figure 2, a machine vision channel flow measurement equipment calibration device is characterized in that it includes:

A flow calibration device, the flow calibration device includes an electronic balance 2, a tray 3 arranged on the electronic balance 2, and an electronic balance 2 arranged on the tray 3;

Wherein, the flow calibration device utilizes the weighing container 1 to obtain the quality of the water within a period of time when the water flows out from the water outlet pipe 4, and the weighing container 1 is placed on the electronic balance 2 with the tray 3 to clear, Tare, no water droplets overflow during the process of using the weighing container 1 to obtain the water quality, and the operation is performed under the video recording of the camera, and the time when the weighing container 1 obtains the water quality can be accurately obtained through the time measurement software, and the electronic The balance 2 can accurately obtain the weight of water, so as to obtain the flow rate of the flow calibration device;

The channel water circulation device, the channel water circulation device includes a platform support 12, and an outlet pipe 4, a channel 7, a water tank 8, an inlet pipe 9 and a water pump 11 arranged on the platform support 12;

Wherein, the channel flow circulation device draws water from the water outlet pipe 4 into the water inlet pipe 9 under the operation of the water pump 11, and the water flow in the water inlet pipe 9 flows into the water tank 8 and then overflows from the weir mouth 10, and the overflowed water flow enters the replaceable channel;

The replaceable channel 7 in the channel flow circulation device is operated based on the platform support 12. The platform support 12 is designed according to the installation of channels with different cross-sections, and channels of different cross-sections such as rectangular, trapezoidal, and U-shaped can be replaced according to requirements. So as to meet the flow measurement requirements of the water conservancy industry;

A machine vision flow measurement device, the machine vision flow measurement device includes a water gauge 5 and a corresponding machine vision flow velocity measurement system 6;

Among them, the machine vision flow rate measurement system is to wait for the water flow to enter the replaceable channel 7, the water flow state is in a stable state, use machine vision or the water gauge 5 to measure the water level at this time, and obtain the surface flow velocity under the machine vision velocity measurement system , when the water level is known, the cross-sectional area of the rectangular channel at this time can be obtained, and the flow at this time can be obtained by using the water level-velocity area method.

Measuring principle:

During the measurement process, the machine vision velocity measurement system 6 obtains the characteristic information of the moving target on the water flow surface, uses the target detection algorithm to obtain the flow velocity on the water flow surface, and uses the hydraulic characteristics of the channel to establish the relationship between the channel surface flow velocity and the flow velocity of the channel section, thereby obtaining the cross-section Flow rate, the water level information is obtained under the measurement of the water gauge 5, and finally the cross-sectional flow is obtained; the corresponding flow calibration device measures the flow using the standard mass method, that is, within a certain period of time, the electronic balance is used to weigh the liquid flowing into the container. quality to measure. During the measurement process, under the condition of constant pump output, the average value and standard deviation are calculated after repeated measurements. Therefore, the measuring device of the utility model has the advantages of accurate time measurement, high accuracy of measurement results, and small size, which is convenient for quick calibration of flow rate on site; and the device can replace channels with different cross-sections as required to meet the flow measurement requirements of the water conservancy industry.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention , replacements and modifications, the scope of the present utility model is defined by the appended claims and their equivalents.

Claims (1)

1. A machine vision channel flow measurement device calibration apparatus, comprising:

the flow calibration device comprises an electronic balance (2), a tray (3) arranged on the electronic balance (2) and the electronic balance (2) arranged on the tray (3);

the channel water flow circulating device comprises a platform bracket (12), and a water outlet pipe (4), a channel (7), a water tank (8), a water inlet pipe (9) and a water pump (11) which are arranged on the platform bracket (12);

the machine vision flow measuring device comprises a water gauge (5) and a corresponding machine vision flow velocity measuring system (6).

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