Semi-trailer positioning and measuring system

Abstract

The invention discloses a semi-trailer positioning and measuring system which comprises a traction-shaft central-line clamping apparatus, a crossbeam central-point clamping apparatus and a tyre-center positioning device. When in measurement, the traction-shaft central-line clamping apparatus is arranged on a traction shaft of a crossbeam, a hanger of the crossbeam central-point clamping apparatus is hung on the measured crossbeam and positioned between the traction shaft and a closest bridge, the tyre-center positioning device is sequentially placed on a tyre at the outer side of each measured bridge, a rim central-clamping jaw of the tyre-center positioning device is clamped on a shaft sleeve positioned in the rim of the tyre at the outer side of each bridge and ensures that the center thereof is superposed with the center of the rim central-clamping jaw, and laser is irradiated onto a scale plate through a light passing hole by adjusting the position of a laser emitting pipe of the tyre-center positioning device; a light spot is beaten on a scale mark '0', which indicates that the bridge is vertical to a reference line and does not need to be adjusted; and if the light spot is not positioned at the '0' position of the scale mark, the bridge is adjusted according to the offset position of the light spot. The system can avoid the influence on measurement due to the geometric model changes, such as the deformation of the crossbeam or the dislocation of the bridge, and the like and ensure the accuracy of measurement.

Description

Technical field [0001] The invention relates to a semi-trailer positioning measurement system. Background technique [0002] The inaccurate positioning of the existing semi-trailer tires is the main cause of the main failures such as abnormal tire wear, fuel increase, unsafe sideways driving and so on. For the positioning measurement of semi-trailer tires, the isosceles triangle method is now adopted at home and abroad, that is, the distance between the outer center of the wheel at both ends of the same bridge and the trailer traction axis is equal to the accurate positioning. This method is effective for the ideal beams and the correct installation positions of the bridges. However, in fact, the chassis wheels of the commercial vehicle are subjected to road bumps, heavy load pressure and torsion after a period of driving, which causes the beams to deform and bridge dislocation. The new car that leaves the factory also has certain defects. In this case, due to the destruction of...

AI Technical Summary

Problems solved by technology

This method is effective for the correct installation position of the ideal girder and each bridge. However, after a period of driving, the chassis wheels of the commercial vehicle are subject to bumps on the road surface, heavy load pressure and torsion, etc., which cause the deformation of the girder and the dislocation of the bridge. There are also certain defects in the new car leaving the factory. In this case, due to the destruction of the geometric model, the isosceles triangulation method can no longer effectively guarantee the accuracy of positioning measurement

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