Coordinate type relative displacement detection magnetic scale used for crane cart and travelling crab

Abstract

The invention discloses a coordinate type relative displacement detection magnetic scale used for detecting a distance relative to a center of a track during motion of a crane cart and a travelling crab. The magnetic scale comprises a magnetic scale 1, a magnetic sensing device 2 and an electronic data processor 3. The core technology is design of the magnetic scale and the magnetic sensing device; the magnetic scale is a collection of interval arrangement of multiple magnetic blocks with the thickness of 1 / 2 of a length unit on one line, a distance between two middle magnetic blocks is one length unit, N magnetic blocks are arranged at the left side and the right side, and a distance between the two adjacent magnetic blocks is 3 length units; the distance between the magnetic blocks and the detection precision have positive correlation, and the number of N and the detected linear displacement length have positive correlation; the magnetic sensing device is a collection of interval arrangement of four magnetic sensing elements on one line, and a distance between two adjacent magnetic sensing elements is one length unit. The coordinate type relative displacement detection magnetic scale has the characteristics of simple structure, convenience for installation and debugging, and no accumulated error, and is suitable for displacement control automation of the crane cart and the travelling crab.

Description

technical field [0001] The invention relates to a linear displacement detection magnetic ruler for cranes and trolleys, which is characterized in that a coordinate relative displacement detection technology is adopted, and belongs to the technical field of linear displacement measurement and sensing in a relatively large range. Background technique [0002] The displacement detection of the large and small trolleys of rail-mounted gantry cranes belongs to the scope of relatively large distance detection; its characteristics are that the detection distance is large, the detection accuracy is high, and the structure of the detection equipment is expected to be simple. [0003] The detection methods used in the past are: 1. First use a mechanical conversion device to convert the linear displacement of the large and small carts into an angular displacement of the measuring wheel; then use a photoelectric shaft angle encoder to detect the angular displacement of the measuring whee...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: ① the mechanical structure has an additional set of conversion devices that convert linear displacement into angular displacement, which increases the complexity of the mechanical structure; This kind of slipping will affect the transformation of the mechanical transformation device, thus causing the accumulation error of detection

[0004] 2. Shanghai Zhenhua Port Machinery Co., Ltd. used the absolute position detection magnetic ruler for the displacement detection of large and small cranes in the past few years. Although the problem of accumulated errors has been solved, the structure of the absolute position detection magnetic ruler is relatively complicated.

The arrangement of the magnets in the collection or the arrangement of the magnetic sensitive elements in the collection must have one side arranged in an aluminum tube or plastic tube according to a certain coding rule, and the other side only needs to be arranged at a simple equal distance; Longer, the higher the measurement accuracy, the more complex the code; the more complex the code, the more difficult the arrangement and construction

Zhenhua Port Machinery chose the scheme that the magnets are arranged according to the coding law in the collection; the utility model "Digital Proximity Displacement Sensor" (ZL03235453.3) is also a magnetic ruler for absolute position detection, but it chooses the magnetic sensitive element in the The schemes arranged according to the coding rules in the collection; these two schemes, no matter which scheme is adopted, the coding will complicate the structure and make processing and debugging more difficult

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