近几年来,小四轮拖拉机虽有许多改进,能下田,能运输,受到农民欢迎。美中不足的是: 1.现在小拖轮距一般是1300毫米,而配套的旋耕机耕幅为700～1000毫米。这样配套作业不能达到质量标准。轮距应该可调,以便于机耕机播作业。 2.多数小拖排气管安全性能差。尤其是轧场作业时,往往因高温干燥,由排气管排出的积炭引起火灾。现有排气管五花八门,长短不一、粗细不一、弯直各 In recent years, although the small four-wheel tractor has many improvements, can drop the field, can transport, welcomed by peasants. The fly in the ointment is: 1. Now a small trailer away from the general is 1300 mm, while the supporting rotary cultivator 700 ~ 1000 mm. Such ancillary operations can not meet the quality standards. Tread should be adjustable, in order to facilitate machine-sowing operations. 2. Most small tow exhaust pipe safety performance is poor. Especially in the rolling field operation, often due to high temperature drying, the exhaust pipe discharged by the coke cause a fire. The existing exhaust manifold varied in length, thickness, straight