In the gearbox assemblies of a longwall shearer, retaining lubricant and excluding contaminants is a constant battle. The Longwall Shearer Flange Bushing is a specialized component that provides both radial support and axial positioning. Its unique "T-shaped" profile allows it to act as both a bearing surface and a spacer, simplifying the internal architecture of the gearbox while providing a stable mounting point for oil seals.
Purpose and Structural Role
The flange on the Longwall Shearer Flange Bushing serves as a built-in stop, preventing the bushing from migrating inward due to vibration or thrust loads. This is particularly important in the haulage unit, where the bushing supports shafts that are subject to multi-directional forces. By holding the shaft in a precise position, the bushing ensures that the lip of the oil seal maintains constant contact, preventing oil leaks that could lead to gear failure.
Engineering Requirements
Materials for these bushings are usually self-lubricating bronze or high-grade steel with a bimetal coating. The design must account for "thermal clearance"; if the fit is too tight, the bushing will seize as it warms up. Mechanical performance is measured by its resistance to "creeping" under load. Shaanxi Heli utilizes precision grinding for the flange face to ensure it sits perfectly flush against the housing, creating a secondary barrier against fine coal dust.
Service and After-Sales
When customers report oil leakage from the gearbox face, the culprit is often a worn Longwall Shearer Flange Bushing that has allowed the shaft to wobble, ruining the seal. The solution is a complete replacement of the bushing and seal assembly. For preventative maintenance, technical teams should use a feeler gauge to check the gap between the flange and the housing. Our after-sales service includes providing customized bushing dimensions for older shearer models where the original housings may have been slightly oversized due to wear.
Shaanxi Heli Mechanical Engineering Co., Ltd
*shearer spare parts manufacturer*
website: www.heli-mining.com
email: yun.liu@helimechanical.com
