Overhead hoist is a hoisting equipment that is horizontally framed over the workshop, warehouse and material yard for material hoisting. Because its two ends are located on tall concrete columns or metal supports, it is shaped like a bridge. The overhead hoist bridge runs longitudinally along the tracks laid on both sides of the overhead, which can make full use of the space under the bridge to lift materials without being hindered by ground equipment. It is the most widely used hoisting machinery with the largest number.

Overhead hoist is an important tool and equipment to realize the mechanization and automation of the production process in modern industrial production and lifting and transportation. Therefore, overhead hoist is widely used in departments and places such as indoor and outdoor industrial and mining enterprises, steel and chemical industry, railway transportation, ports and terminals, and logistics turnover.
Maintenance of overhead hoist:
1. Leakage repair protection
Overhead hoist trolley reducer is affected by vibration, wear, pressure, temperature and other factors, and oil leakage often occurs in the static sealing parts of each joint surface. The traditional treatment method involves disassembling the reducer, replacing the sealing gasket or applying sealant, but it is time-consuming and laborious, and it is difficult to ensure the sealing effect, and leakage will occur again during operation. Contemporary Western countries mostly use polymer composite materials to treat leakage on site, and the most used Blessed World Blue series. Polymer materials can be repaired without disassembly, and the material has superior adhesion, oil resistance and 350% stretch, which can well overcome the impact of reducer vibration, and the repair effect is more effective than traditional methods.
2. Wear control
The overhead hoist active wheels and the reducer of the large vehicle run frequently, and multiple reverse emergency stops and stops will cause the torque and vibration of each axis of the reducer to increase, which is easy to cause leakage. After this type of problem occurs, the traditional methods are mostly repair welding or machining repair after brush plating, but both have certain drawbacks: the thermal stress generated by the high temperature of repair welding cannot be completely eliminated, and it is easy to bend or break; while the electric brush Plating is limited by the thickness of the coating and is easy to peel off. The above two methods use metal to repair the metal, which cannot change the "hard-to-hard" coordination relationship. Under the combined action of various forces, it will still cause re-wear. Most of the latest maintenance methods are based on polymer composite materials, and the most widely used products are Mikahua technology products, which have super adhesion, excellent compressive strength and other comprehensive properties. The application of polymer materials for repair has no effect of repair welding thermal stress, and the repair thickness is not limited. At the same time, the product has a retreat that the metal material does not have, which can absorb the shock and vibration of the equipment, avoid the possibility of re-wear, and greatly extend the equipment The service life of the components saves a lot of downtime for the enterprise and creates huge economic value.