Multiroll mill back support roller back liner bearing lubricating device

The utility model discloses a lubrication device for the backing bearings of backrest backup roller in a multi-roller mill, comprising a mandrel and a backing bearing mounted on the hollow mandrel, on the wall of which at least a lubrication oil hole connected with the lubrication point on the inner surface of the backing bearing is provided. In the hollow mandrel, an oil-gas supporting device comprising a mandrill pipe with mandrill lubrication oil holes is provided. The mandrill pipe is fixedly connected with at least one brunch pipe whose outlet is opposite to the lubrication oil hole and another end is connected with an oil-gas mixer, which is communicated with an oil-gas lubrication station through a lubrication oil pipe and a compressed air pipe. This lubrication device can directly transport the lubricant to every lubrication point of the backing bearings of the backrest backup roller, so as to lubricate them nicely and evenly. At the same time, the excessive oil and gas can be reclaimed to save the lubricant. These features are favorable for the sealing and lubricating of the backing bearings, so as to prolong their service life and bring no harm to people and to environment.