What safety matters should be paid attention to when using bridge cranes

Overhead cranes are mechanical equipment used to lift various objects horizontally above workshops, warehouses and open-air storage yards. They are usually called "crane" or "traveling cranes". It is a kind of hoisting machinery widely used in machinery industry, metallurgical industry and chemical industry. In modern industrial enterprises, it is one of the important equipment to realize the mechanization and automation of the production process, reduce heavy physical labor, and improve production efficiency. The following safety matters should be paid attention to when using bridge cranes:

1. The driving must be in a normal state, especially the safety devices, such as the braking mechanism, sound and light, signals, interlocking devices, etc., must be sensitive and intact.

2. During the working process, the operator should concentrate his energy, first idling before lifting, and then lifting. The lifting object is 100～150mms off the ground. A signal bell should be sounded before driving; hanging objects must not pass over people's heads. When the overhead crane is moving, it is strictly forbidden to repair, inspect, refuel and wipe the parts. If a malfunction is found during operation, the machine must be stopped immediately.

3. When the work is terminated, the crane should be parked on the parking line, and the hook should be raised in place, and no heavy objects should be hung on the hook. Put all the controllers and joysticks to the zero position, pull out the power switch, and lock the cab door.

4. Bridge cranes must be equipped with reliable and sensitive safety devices. Generally, there are buffers, limiters (stroke limiter, lifting limiter), lifting limiter, windproof rail clamp, etc.

5. The shell of all live parts of the crane should be reliably grounded to avoid accidental electric shock accidents by the operator. When the trolley track is not welded to the main beam, welding grounding should also be adopted, and the step-down transformer should be grounded on the low-voltage side as required.

6. Bridge cranes shall not be hoisted under the following conditions:
(1) Unmanned command or incorrect command signal.
(2) The driving equipment is defective or the safety device fails.
(3) Overloaded lifting or equipment quality is not clear.
(4) People stand on or under the lifting objects and use crane hooks to lift people.
(5) The light is dark and the vision is unclear.
(6) The hoisting object has sharp edges or corners or is pulled diagonally, and safety measures are not taken