起重机是指在一定范围内垂直提升和水平搬运重物的多动作起重机械。又称天车，航吊，吊车。
A crane refers to a multi action lifting machinery that vertically lifts and horizontally transports heavy objects within a certain range. Also known as overhead crane, aerial crane, or crane.
轮胎起重机的主要特点是：其行驶驾驶室与起重操纵室合二为一、是由履带起重机（履带吊）演变而成，将行走机构的履带和行走支架部分变成有轮胎的底盘，克服了履带起重机（履带吊）履带板对路面造成破坏的缺点，属于物料搬运机械。
The main feature of a tire mounted crane is that its driving cab and lifting control cabin are integrated, evolved from a crawler crane (crawler crane), which transforms the tracks and walking brackets of the walking mechanism into a chassis with tires, overcoming the disadvantage of damage caused by the crawler shoes of the crawler crane (crawler crane) to the road surface. It belongs to material handling machinery.
桥式起重机是横架于车间、仓库和料场上空进行物料吊运的起重设备。由于它的两端坐落在高大的水泥柱或者金属支架上，形状似桥。桥式起重机的桥架沿铺设在两侧高架上的轨道纵向运行，可以充分利用桥架下面的空间吊运物料，不受地面设备的阻碍。它是使用范围最广、数量最多的一种起重机械。
Bridge crane is a lifting equipment that is horizontally mounted over workshops, warehouses, and material yards for material lifting. Due to its two ends located on tall cement columns or metal supports, the shape resembles a bridge. The bridge of an overhead crane runs longitudinally along the tracks laid on both sides of the elevated structure, allowing for full utilization of the space below the bridge to lift materials without being hindered by ground equipment. It is the most widely used and numerous type of lifting machinery.
起重设备有的工作特点是做间歇性运动，即在一个工作循环中取料、运移、卸载等动作的相应机构是交替工作的，起重机在市场上的发展和使用越来越广泛泥杆 保定古筝 塑料增韧剂 拱形护坡模具 保定空调维修  托辊生产线。由于不用支腿吊重及吊重行驶经常出现一些事故，行驶的速度也较履带起重机（履带吊）快；作业稳定、起重量大、可在特定范围内吊重行走、但必须保证道路平整坚实、轮胎气压符合要求
Some working characteristics of lifting equipment are intermittent movements, that is, the corresponding mechanisms for picking up, transporting, unloading, and other actions in a working cycle work alternately. The development and use of cranes in the market are becoming increasingly widespread. Due to the lack of support legs for lifting and frequent accidents during lifting, the traveling speed is also faster than that of crawler cranes (crawler cranes); Stable operation, large lifting capacity, capable of lifting and walking within a specific range, but must ensure that the road is flat and solid, and the tire pressure meets the requirements