目的 解决夹具在抓取圆柱桶时产生的桶体变形、桶外观破坏及夹具不能兼容不同桶型的问题。方法 设计一种气囊式夹具，通过四连杆结构保证爪体始终垂直，通过气缸调整爪体间距。结果 四连杆结构节省了夹具的空间，调整气缸保证了夹具工作时对不同圆柱桶的兼容性，气囊避免了圆柱桶的的外形受到破坏，双行程抓取气缸降低了设计和制造成本，同时能够使夹具适应具有锥度和翻边的圆柱桶。结论 该夹具经实际应用，工作可靠，运转良好，具有推广价值。

The work aims to solve the problem of barrel deformation and damage when fixture was working, and the problem that fixture was not compatible with multiple types of barrels. An airbag-type fixture was designed in which the 4-linkage structure was used to ensure that the gripping device remained vertical and the distance of gripping device was adjusted by air cylinder. In this fixture, the fixture space was saved by 4-linkage structure. The adjusted air cylinder ensured that the fixture could be compatible with multiple types of barrels. Furthermore, damage of barrel was avoided with the airbag. The costs of fixture design and manufacture were reduced because of the double-stroke grasping cylinder, which could make the fixture suitable for barrel with taper and flanging. The practical application shows that the fixture operates reliably and has promotional value.