Sealing grease for main bearing of shield machine

Abstract

The invention belongs to the technical field of sealing grease, and particularly relates to sealing grease for a main bearing of a shield machine. The sealing grease is prepared from the following components in parts by weight: 14-20 parts of base oil, 6-12 parts of degradable fibers, 11-20 parts of a pasty adhesive, 4-15 parts of a structural stabilizing agent, 25-30 parts of an oiliness agent and a friction improver, 5-10 parts of a fire retardant and 3-8 parts of a rust inhibitor. The sealing grease disclosed by the invention has the beneficial effects of being favorable in stickiness and insoluble in water, so that the sealing grease has excellent flooding resistance, appropriate consistency and favorable lubricating properties; the lubricating and sealing properties of moving parts are guaranteed; a fibrous structure guarantees the head of the shield machine to be free from invasion of impurities, precision parts of bearings and the like are prevented from being abraded, and the sealing grease has favorable pumping performance and low-temperature performance.

Description

technical field [0001] The invention belongs to the technical field of sealing grease, in particular to a sealing grease for the main bearing of a shield machine. Background technique [0002] Tunnel engineering excavation equipment-shield machine is mainly used in urban rail construction, highway and railway, municipal engineering, water conservancy engineering, river and sea tunnels, water (nuclear) power plant diversion projects and military confidential facilities and other fields. During the construction process of the shield machine, there are mud, rocks, sand, water, dregs and other dregs in the cutterhead soil bin, and there is still a certain pressure. In order to prevent mud, rocks, sand, water, dregs and other dregs from entering If the main bearing of the shield machine and the bearing of the screw conveyor cause damage to the rotating parts of the shield machine, the sealing grease for the main bearing of the shield machine must be used. It is a sealing grease s...

AI Technical Summary

Problems solved by technology

Since the tunneling equipment shield machines are all imported from Europe, America, Japan and other countries in the early stage, and the seal grease of the main bearing of the shield machine is also monopolized by companies such as CONDAT, TOTAL, BASF in France and Matsumura in Japan, so the main bearing of the shield machine is used Sealing grease must rely on imports and is expensive

[0003] In recent years, domestic companies have also begun to research and develop the seal grease for the main bearing of the shield machine, but the products developed are not ideal in use, and may even damage the equipment, which is far from the performance of foreign products. The main problem is: the selection of raw materials is not enough. If it is reasonable, it will often block the pumping pipeline; it will be greatly affected by the ambient temperature, it will harden at low temperature, and the pumping pressure will be too high, which will cause the pipeline to rupture or fail to pump; when the temperature is high, the product consistency will decrease, and the outer seal of the cutterhead bearing will not be good. Keep the pressure, so that mud, rock, sand, water, slag and other dregs enter the main bearing of the cutterhead drive and damage the equipment; the product contains substances that are harmful to the rubber seal of the main bearing of the cutterhead, which will cause the lip seal of the shield machine’s inlet bearing to become damaged. Hardness, shrinkage and failure problems