How to adjust the level of air cushion guide rail in college physics

Place two photoelectric doors in the middle of the guide rail 50~60cm, and adjust the anchor screw to make the time for the photomask on the slider to pass through the two photoelectric doors almost equal. The specific steps are as follows:

Coarse adjustment: Turn on the air source, gently place the slider with shading sheet on the guide rail, and adjust one foot screw to keep the slider basically static everywhere on the guide rail.

Fine adjustment: make the slider move at a certain speed, measure the shading time t 1 and t2 when the slider passes through two photoelectric doors successively, and carefully adjust one screw to make the difference between t 1 and t2 less than 5%, so that the guide rail can be considered as basically horizontal.

Introduction of air cushion guide rail

Guide rail: The guide rail is made of flat and smooth triangular aluminum alloy and fixed on the rigid I-beam with a length of1.5m. Two rows of spray holes are evenly distributed on the rail surface. One end of the guide rail is closed, and the other end is provided with an air inlet connected with an air pump. When compressed air is ejected from the small air hole, the slider is lifted to reduce friction. In order to avoid collision, both ends of the guide rail and the slider are equipped with buffer springs; Three anchor screws are installed at the bottom of the I-beam frame, which are located at both ends of the guide rail respectively. The screws at the foot end are used to adjust the height of both sides of the rail surface, and the screws at the single foot end are used to adjust the level of the guide rail, or pads with different thicknesses are placed under it to get different inclinations. In addition, in order to facilitate the measurement, a millimeter scale is fixed on one side of the guide rail as a tool for positioning the photoelectric door.