The invention discloses a laser long chord track smoothness detection device, and belongs to the technical field of track measuring instruments. The laser long chord track smoothness detection device comprises a cross beam, an auxiliary wheel and a walking wheel, wherein the auxiliary wheel and the walking wheel are located at the two ends of the cross beam; the auxiliary wheel is rotationally connected with an auxiliary longitudinal beam; the auxiliary longitudinal beam is movably inserted into one end of the cross beam; an adjusting wheel is in threaded connection with the auxiliary longitudinal beam; the bottom of the adjusting wheel is rotationally connected with the cross beam; a mounting longitudinal beam is fixed to the other end of the cross beam; the walking wheel is rotationally connected with the mounting longitudinal beam; a horizontal detection wheel is arranged at the bottom of the mounting longitudinal beam; a mobile platform driven by a stepping motor is arranged on the cross beam; and a digital receiving target and a detection target are arranged on the mobile platform. The laser long chord track smoothness detection device has the beneficial effects that the automatic collection of the laser center position and the analysis and optimization of the collected data are realized, the problems of human eye interpretation and insufficient measurement precision are solved; and the measurement of the elevation difference between the head point and the tail point in the track measurement is realized.

本发明公开了一种激光长弦轨道平顺度检测装置，属于轨道测量仪器技术领域。包括横梁，以及位于横梁两端的辅助轮和行走轮，所述辅助轮转动连接辅助纵梁，所述横梁一端活动插接辅助纵梁，调整轮螺纹连接辅助纵梁，调整轮底部转动连接横梁，横梁另一端固定有安装纵梁，行走轮与所述安装纵梁转动连接，安装纵梁底部设有水平检测轮，横梁上设有通过步进电机驱动的移动平台，移动平台上设有数字接收靶和检测靶。本发明的有益效果是：实现了激光中心位置的自动采集以及对采集数据的分析、优化，解决了人眼判读以及测量精度不足的问题；实现了轨道测量中的首尾两点的高程差的测量。