Yaw brake block and preparation method thereof

Abstract

The invention belongs to the technical field of friction material used for mechanical brake and particularly discloses a yaw brake block, which adopts the main technical scheme that the yaw brake block consists of binder, reinforcing material, friction performance modifier and lubricating anti-friction material; and the yaw brake block is prepared through procedures of proportioning, mixing, rolling, heat treatment and grinding. As the friction performance modifier of the yaw brake block adopts precipitated barium sulfate, cashew nut shell oil, potassium titanate spar and barite and does not contain any metal component, thereby leading the rigidity of the prepared yaw brake block to be greatly reduced; as the binder is formed by mixing NBR modified phenolic resin and polyvinyl butyral, thereby leading the yaw brake block to have higher compressive strength and shearing strength compared with the yaw brake block prepared by only using phenolic resin as the binder.

Description

technical field [0001] The invention belongs to the technical field of friction materials for mechanical braking, and in particular relates to a yaw brake pad used on a wind power generator and a preparation method thereof. Background technique [0002] Yaw brake pads are the main accessories used in wind turbines to control their rotation direction and speed. Traditional yaw brake pads are metal powder sintered type. For example, Chinese patent application number 200810068968.2 and publication number CN101413559A disclose a yaw brake pad. The main materials constituting the brake pad include as It consists of iron powder, copper powder as filler, quartz sand and silicon carbide as reinforcement material, and tin powder as binder. This yaw brake pad product has the following defects: one, since the fillers constituting the yaw brake pad are 50-75% iron powder and 5-18% copper powder, its specific gravity and thermal conductivity are significantly increased, and the use of ...

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Problems solved by technology

This yaw brake pad product has the following defects: one, since the fillers constituting the yaw brake pad are 50-75% iron powder and 5-18% copper powder, its specific gravity and thermal conductivity are significantly increased, and the use of In the process, the aggressiveness to the pair is enhanced, and it is easy to rust and easily cause the lining to fall off from the steel back, causing windmill accidents; second, because the reinforcing material of the yaw brake pad is 5-20% quartz Sand and 1-10% silicon carbide, so it has the characteristics of high mechanical strength, large static friction moment and low wear rate, but due to the relatively high hardness of quartz sand and silicon carbide (Mohs hardness reached 7 and 9.5 respectively), Therefore, during the use of the yaw brake pad, it will seriously scratch the pair and produce huge noise, which is no longer acceptable to users

However, the brake lining prepared by using phenolic resin as adhesive has low compressive and shear strength, which makes the product crack, crack or fall off during use, and in the long-term use process, it will Due to the increase in temperature, its friction performance is attenuated, resulting in unstable operation of the fan

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