Combined hydraulic pre-tightening locking device and hard alloy compound roller

Abstract

The invention discloses a combined hydraulic pre-tightening locking device and a hard alloy compound roller which is assembled by using the device. The device comprises a pre-tightening nut, a T-shaped backing ring, a pre-tightening combined gasket formed by a pair of semicircles, a plurality of force-transferring pillars, a hydraulic flange, an annular backing ring, an annular piston and a sealing ring, wherein the pre-tightening nut is provided with an external screw thread and a plurality of uniformly distributed axial through holes; the force-transferring pillars are matched with the axial through holes and can move axially; the hydraulic flange is matched with the external screw thread of the pre-tightening nut; an external cylindrical side of the hydraulic flange is provided with anoil hole communicated with the annular piston; the annular piston is positioned in a cylinder in the hydraulic flange and the end face of the annular piston is contacted with the lower end face of the annular backing ring; and the sealing ring is arranged between the annular piston and the cylinder of the hydraulic flange. The device can be used for reliably pre-tightening parts on a shaft as well as replacing a hydraulic nut. The device is free from working under a pressure, is free from the long-term influences of working ambient temperature, oil, steam, and the like, has long service life,and is simple in structure and low in cost.

Description

technical field [0001] The invention relates to a combined hydraulic pre-tightening locking device and a cemented carbide composite roll assembled by the device. Background technique [0002] The commonly used composite forms of cemented carbide composite rolls are the bonding of the main shaft of the roll and the roll ring, interference fit, or fastening with hydraulic nuts, and inserting backing rings, locking rings with slopes or The wedge ring fills the gap between the hydraulic nut and the clamped parts to maintain the pre-tightening force after pressure release. Hydraulic nuts are widely used in metallurgical machinery because they can generate a large axial preload to ensure that the fastened mechanism can effectively overcome axial creep and stabilize fastening under conditions of large environmental fluctuations such as vibration, temperature change, and impact. , mining machinery, machine tools, ships, rolls and other fields, especially suitable for fastening of l...

AI Technical Summary

Problems solved by technology

The biggest advantage of the hydraulic preload mechanism of this type of structure is that the hydraulic nut does not need to work under pressure, which is safe and stable and reliable; the disadvantage is that the seal of the hydraulic nut is a polymer material, which is affected by temperature, oil, water, etc Affected by factors, it is easy to age, which is not conducive to repeated use, and this kind of high-pressure resistant seal has strict requirements on materials and is expensive

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