The polyurethane bumper or buffer is a safty device for anti-collision of crane and hoist trolley frame. When the position limiter or brake of the mechanical bridge crane is malfunctioning, the overhead crane or trolley running to the end due to inertia will collide with the provided stop at the running end. The purpose of setting the buffer is to absorb the crane or crane operation function to slow down the impact. The buffer is set at a position where the crane or trolley is in collision with the stop. A buffer should also be provided between the cranes running on the same track and between the two carriages on the same bridge.
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