Horizontal force supporting mechanisms for working rollers of eighteen-roller mill

The invention relates to horizontal force supporting mechanisms for working rollers of an eighteen-roller mill. The horizontal force supporting mechanisms are arranged at inlets and outlets of all the working rollers in pairs and symmetrically arranged with respect of a steel passing line of the eighteen-roller mill. The horizontal force supporting mechanisms are characterized by comprising vertical push-pull hydraulic cylinders and horizontal push-pull hydraulic cylinders; every two push-pull hydraulic cylinders form a connection rod and slide block structure; the tail end of each connection rod and slide block structure is provided with a side supporting roller box which mainly comprises a main backing bearing, an auxiliary backing bearing, a side supporting rollers and a roller box frame; and during working, the side supporting rollers make contact with the working rollers, horizontal force of rolling is transmitted through the side supporting rollers and received by the corresponding two push-pull hydraul