Method of controlling reference grinding position for rail welding joint refiner

Abstract

A method of controlling the reference grinding position for a rail welding joint refiner mainly includes: firstly, aligning a grinding wheel to a non-weld position of a rail grinding area, and allowing a PLC to control a grinding servo motor to rotate and drive the grinding wheel to rotate; allowing the PLC to control a feed servo motor to reversely rotate so as to vertically lower a tool feeding mechanism; when armature current detected by a grinding servo motor armature current sensor reaches a threshold, allowing the PLC to control the feed servo motor to stop, and marking the vertical position of the tool feeding mechanism as a reference position; secondly, allowing the tool feeding mechanism to vertically ascend to a zero grinding position so as to perform longitudinal reciprocated grinding and vertical feeding on a steel rail until the vertical position of the tool feeding mechanism descends to the reference position; thus, fishing grinding of the grinding area. The method has the advantages that the reference grinding position can be positioned automatically, grinding feed is automatically controlled, and grinding is automatically stopped when the grinding feed position reaches the reference position; positioning of the reference position is accurate, response is fast, reliability is high, and grinding quality is fine.

Description

technical field [0001] The invention relates to a method for controlling the grinding reference position of a rail welded joint refiner. Background technique [0002] At present, my country's seamless line rails mostly use the flash welding method at the welding rail base to connect the fixed-length rails with a length of 25 meters or 100 meters into long rails of about 500 meters. Weld bumps are formed, and due to problems such as the rigidity of the welding machine, the welding process, and the accuracy of the rail alignment before welding, the welded joints will be deformed such as upward arching and side bending. The remaining welding bumps and deformations at the welding joints not only affect the The service life of itself is also related to the driving safety and comfort of high-speed trains. At present, rail welded joint fine grinding machines are used at home and abroad to grind welded joints to ensure the smoothness of seamless railways. [0003] At present, the rai...

AI Technical Summary

Problems solved by technology

The existing problems are: 1. The sensor needs to convert the vibration, sound or fire light signal into an electrical signal and then transmit it to the PLC (programmable controller). The reference position is determined inaccurately at the moment when the area is polished rather than just in contact with the position; 2. Sound, fire, and vibration sensors need to be placed close to the grinding end face to collect signals, which are easily affected by external environments such as noise and stray light. It leads to poor reliability and easy to generate wrong signals; 3) It requires external installation of special sensors, which makes the cost high and requires installation and debugging before grinding, which is not convenient enough to use