Research On Welding Quality On-line Detection System Of Harvester Threshing Cylinder

Threshing cylinder is the key component of rice and wheat harvester, It is mainly completed through welding processing, the welding quality affects the operation performance of harvesting machinery directly. At present, the field of threshing cylinder welding quality detection in our country is still in blank.In this paper, we carried on research in welding quality on-line detection device of threshing cylinder, and we put on circular degree, cylindrical degree and vertical degree on-line detection methods. We developed detection test bench, the servo motors were driven by industrial PC and motion control card, so as to control the threshing cylinder and laser sensors, and then finished the distance information collection. We could calculate the circular degree, cylindrical degree and vertical degree through signal processing and data analysis. We firstly proposed a method about threshing cylinder welding quality detection based on laser ranging, this method realized continuous scanning of threshing cylinder outer wall, it got rid of the effect of artificial measurement method, which always affected by the different measurement point. We also developed on-line detection computer procedure, through the interface we could complete the welding quality detection of threshing cylinder accurately and efficiently.Experimental results showed that the detection diameter of the test bench was from 300mm to 600mm, the detection length was from 1800mm to 2100mm, and the detection time was less than 3 min. The detection error of the system was less than 3% and the repeatability error less than 1%.The interface of the on-line detection system was concise and the operation was simple. The system was stable and it satisfied the requirement of practical production.