Overhead crane is a kind of heavy lifting equipment commonly used in workshops. The commonly used models are LD single girder crane, LX underhung bridge crane, HD European standard single girder crane, QD double girder crane, LH double girder hoist bridge crane, NLH European standard hoist overhead crane, etc. The operation mode of the overhead crane can be divided into ground operation and cabin operation. The ground operation mode includes pendant control and wireless remote control.
- Pendant control: during the operation, the operator has to follow the crane and the load.
- Wireless remote control: it is not necessary to follow the crane and the load when lifting larger and more dangerous goods.
- Cabin control: it provides a wide field of vision, and requires dedicated personnel to operate the crane, with the cooperation of personnel on the ground.
Because the single girder overhead crane is relatively simple, it generally uses the ground operation mode, and the remote control is increasingly popular. Large-tonnage double girder overhead crane generally uses the cabin control due to its excellent safety, high efficiency, better vision and better control of the overall situation. The cabin has two types: open and closed. It can be installed on the left or right of the crane according to your needs.
Overhead Crane Control Requirements
- The heavy object should be able to move in the up, down, left, right, front and back directions, and can move in the three-dimensional direction at the same time.Except for the downward movement, the terminals in the other five directions should be provided with terminal protection.
- Overhead crane must have a reliable braking device, even in the event of a power outage, heavy objects will not fall under their own weight.
- The crane should have a large speed adjustment range. When it starts to move from a stationary state, it should gradually accelerate from the lowest speed, and the acceleration cannot be too large.
- In order to prevent the danger that may occur when overloading or speeding, the crane shall have short-term overload protection measures. Overcurrent relays are generally used as overload protection for circuits.
- The crane must have pressure loss protection.
- The crane must have safety measures.
Tips for Safe Operation of Overhead Cranes
- Each crane must be hung with a rated weight plate in an obvious place.
- During work, no one is allowed on the bridge.
- The crane is not allowed to be overloaded.
- Lifting is not allowed in the following situations: loose binding; overloaded machine parts; unknown signal; oblique pulling; objects buried or frozen in the ground; people on the suspended objects; flammable products and explosives without safety protection measures; overfilled liquid items; wire ropes do not meet the requirements for safe use; the lifting mechanism is faulty.
- When the crane is running on the line without obstacles, the hookand the bottom of the hanging object must be more than 2m above the ground. If the crane crosses the obstacle, it must be 0.5m high from the obstacle.
- For bridge cranes with main and auxiliary hooks, do not raise or lower the main and auxiliary hooks at the same time.
- When the crane lifts an object less than 50% of the rated lifting weight, two mechanisms are allowed to move at the same time; when lifting an object greater than 50% of the rated lifting weight, only one mechanism can move.
- Limit switches and interlock protection devices should be checked frequently.
- Suspended objects are not allowed to run over people or equipment.
- Safety inspections should be done regularly.
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