垦区每年冉6000余台链轨拖拉机要进行修理,其中有80%的拖拉机支重轮外缘磨损超限,需更新或修复。目前各修理部门所采用的修复工艺各不相同,但基本上有轮缘下圈,振动堆焊、镶圈(将旧轮缘割掉更换新铸钢轮圈)和铸铁包铸等方法。据调查采用前两种方法较普遍,但在工作中有时会出现轮圈活动、掉块等现象。 Each year, more than 6,000 chain-link tractors are being repaired in the reclamation area, of which 80% of the outer diameter of tractor roller wheels are worn out and need to be renewed or repaired. At present, the repair process adopted by various repair departments is different, but there are basically methods such as rim under ring, vibration overlay welding, setting ring (cutting and replacing the old rim with a new cast steel rim) and cast iron casting. According to the survey the first two methods are more common, but at work sometimes appear rims activities, off the block and so on.