小吨位双梁桥式起重机经常出现小车“三条腿”(小车四个车轮有一个与轨道不接触时称为三条腿)现象,其中5吨起重机尤为普遍。“三条腿”较严重时,对起重机性能有较大的影响——造成小车起动和制动时车身扭摆,运行时啃道,吊物摆动及车轮轮压不均,磨损程度不一致等后果。 我厂自一九八○年开始对所有桥式起重机都在性能试验台上进行试验。在试验过程中对5吨桥式起重机小车的“三条腿”现象进行了 The small tonnage double girder overhead traveling crane often has the phenomenon of “three legs” of the car (four wheels of the car have one leg which is not in contact with the track and is called three legs). Among them, the 5-ton crane is especially common. When the “three legs” are more serious, the performance of the crane will have a greater impact - causing the body to wobble when starting and braking the car, feeding the road during operation, swinging the hanging object, uneven wheel pressure and inconsistent degree of wear. Since 1980, all our overhead cranes have been tested on the Performance Test Bench. During the test on the 5 ton overhead crane car “three legs” phenomenon was carried out