目前,在金属矿山设在罐笼前、用以更换罐笼内矿车的推车机,主要有液压推车机和气动推车机两种形式。气动推车机的主要特点是:结构简单,在通常的结构形式下不需要复杂的机械加工,设备重量轻;在坑内潮湿、泥泞的环境中运转可靠,成本低。液压推车机是把气动推车机的气缸换成油缸,利用液压站调控进行工作,只有在较高的制造、安装质量和严格维修的前提下,才能保证液压推车机的正常工作,其生产使用成本是气动推车机的3～4倍。鉴于以上不同点,规模较小的矿山大多采用气动推车机。1 气动推车机结构常规设计气动推车机结构见图1。推车机在推力气缸3的活塞杆一端带有推爪2,压缩空气通过气阀进入气缸的后腔或前腔,使活塞杆带动推爪前进或后 At present, before the metal mines are located in the cage, carts used to replace tubs in the cages are mainly in the form of hydraulic pushers and pneumatic pushers. The main features of the pneumatic pusher machine are: simple structure, no complicated mechanical processing in the usual structure form, light weight of the equipment, reliable operation and low cost in the wet and muddy environment in the pit. Hydraulic pusher machine pneumatic cylinder is replaced by the cylinder cylinder, the use of hydraulic control station to work, only in the higher manufacturing, installation quality and strict maintenance of the premise, to ensure the normal operation of hydraulic pusher machine, which Production and use of the cost of pneumatic pusher 3 to 4 times. In view of the above differences, most of the smaller mines use pneumatic carts. 1 pneumatic cart structure conventional design pneumatic cart structure shown in Figure 1. Pusher cylinder 3 at the end of the thrust rod with a push pawl 2, compressed air through the valve into the rear chamber of the cylinder or the former cavity, so that the piston rod moves the pawl forward or after