A size measuring device and method

Abstract

The dimension measuring device and method provided by the embodiments of the present invention relate to the field of automatic dimension measurement of objects in the logistics industry. In the device and method, the first infrared grating detector is used to collect the position information of the item to be transported located on the conveyor belt according to the preset first frequency, and the industrial computer is used to determine the side length of the circumscribed rectangle of the horizontal section of the item to be transported based on the position information. The second infrared grating detector collects the height information of the item to be transmitted according to the preset second frequency, and then uses the industrial computer to determine the height of the item to be transmitted according to the height information; since the position information is collected according to the preset first frequency, thus The amount of data in the process of measuring the size can be reduced, so that when the transmission rate of the conveyor belt increases, only by increasing the refresh rate of the infrared grating, the position information and height information of the item to be transmitted can still be collected, so that the location of the item to be transmitted can be determined While reducing the size, it can also improve the measurement efficiency.

Description

technical field [0001] The invention relates to the field of automatic measurement of object dimensions in the logistics industry, in particular to a dimension measurement device and method. Background technique [0002] In the logistics industry, it is necessary to measure the length, width and height of the express delivery. If the shape of the object is irregular, it is necessary to calculate the minimum circumscribing cuboid. The size information after measurement has two uses. One is to calculate the price of the express delivery based on the volume, and the other is to rationally arrange the storage location through computer algorithms according to the size of the object to increase the cargo capacity of each truck. [0003] At present, the most common express size measurement method is manual inspection. This method is inefficient, expensive, and has low accuracy for irregular objects. At the same time, there are some automatic object size measurement methods based ...

AI Technical Summary

Problems solved by technology

This method is inefficient, high cost and low accuracy for irregular objects

At the same time, there are some automatic object size measurement methods based on cameras and structured light on the market, but the detection results obtained by these measurement methods are greatly affected by the color of the object. When the color of the object is similar to the color of the conveyor belt, it is easy to fail to distinguish the object. profile and go wrong

[0004] There are also some automatic object size measurement methods based on binocular cameras on the market. These methods have the following problems: there are requirements for the shape of the object, and it is necessary to ensure that the uppermost plane of the object is the largest cross-section, and this problem is This method is not suitable for measuring the size of irregular objects because ordinary cameras have the characteristic of imaging "near large and far small".

[0005] There are also some automatic measurement methods for irregular object sizes based on infrared gratings on the market. These methods generally have the following problems: the measurement speed is not high, and the maximum speed is basically lower than 0.5m / s

In the logistics industry, the speed of the entire assembly line is generally greater than 0.5m / s, so when using these methods to measure the size of objects, it is necessary to use speed bumps to decelerate first, and then use conveyor belts to accelerate after the measurement. This method will not only increase the cost, but also It will reduce the efficiency of the entire logistics pipeline, and may also increase unstable factors

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