The manual hoist basically adopts the load-limiting principle of friction and slip. When the load torque is greater than the friction torque, the lift is invalid. There are also some indirect forms in which the foreign hand hoist adopts the over-loading force exceeding the limit value to cause the handle to bend, but due to the operation mode. Different does not apply to the chain hoist.
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The manual hoist basically adopts the load-limiting principle of friction and slip. When the load torque is greater than the friction torque, the lift is invalid. There are also some indirect forms in which the foreign hand hoist adopts the over-loading force exceeding the limit value to cause the handle to bend, but due to the operation mode. Different does not apply to the chain hoist.
According to the principle of frictional slipping, there are also many different designs, such as contact by friction surface; the pressing method is directly pressed by the fastener, and the wedge is tightly pressed by the cone; it is adjusted by one nut or adjusted by three screws, etc. Figure 1 shows a typical structure with good effects and processability.
In Fig. 1, the friction plate adopts copper fiber resin to improve the friction coefficient and increase the friction stability. At the same time, the friction piece as the main wearing part is required to be replaced and convenient for maintenance. The hand hoist is tightened with one adjusting nut to ensure the whole contact. The surface is evenly stressed. In contrast, the hand hoist uses three screws due to structural constraints, which is convenient to operate but requires uniform adjustment.
Obviously, the magnitude of the frictional transmission torque depends on the contact performance and the fastening force of each contact surface in the case of determining the contact area. Therefore, in order to ensure a correct and stable load-limiting value, it is necessary to understand the use characteristics of the material and find an appropriate test. method
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