Introduction to safety devices for overhead traveling bridge cranes

overload limiter
(1) The comprehensive error of the overload limiter should not be greater than 5%, and the number of lifting and lifting weight can be recorded.
(2) When the load reaches 90% of the rated lifting capacity, an alarm signal should be issued; when it is 100-110% of the rated lifting capacity, the power supply for the lifting control of the hanging object should be automatically cut off through interlock control.
(3) The overload limiter must not be adjusted or canceled without authorization. Routine inspection and maintenance must be in place and calibrated regularly.

Torque limiter
(1) The torque limiter is used for variable amplitude operating lifting equipment such as truck sevencrane top running crane for sale, crawler cranes, and tower cranes.
(2) The comprehensive error of the torque limiter should not be greater than 10%.
(3) After the lifting machinery is equipped with a torque limiter, it should be adjusted or calibrated according to its performance and accuracy. When the load moment reaches the rated lifting moment, the power source for lifting or luffing can be automatically cut off and a prohibition signal is issued. Sexual alarm signal.

Ascending and descending limit position limiter
(1) Lift limit: The limit position limiter must ensure that when the spreader is lifted to the limit position, the power source for lifting is automatically cut off. For the hydraulic lifting mechanism, a prohibitive alarm signal should be given and a deceleration limit should be set. There are many heavy hammer types, and the electric hoist triggers the limit switch for the rope guide operation.
(2) Lowering limit: Under working conditions where the spreader may be lower than the lower limit position, it should be ensured that when the spreader drops to the limit position, the power source of the descent can be automatically cut off to ensure that the wire rope is not wrapped around the drum. The number of turns specified in the design (usually at least 3 turns).

Operation limit position protection (limit, collision avoidance device)
(1) Limit switch: Also known as the operating limit position limiter, it should ensure that the mechanism automatically cuts off the forward power source and stops movement when it reaches the limit position of its movement. A deceleration limit should be set before the stop limit action.
(2) Collision avoidance device: When two or more industrial top running crane manufacturers are operating in the same span, a collision avoidance device should be installed on each crane. Currently, infrared and laser ranging are commonly used. In terms of performance, laser type is better than infrared type.

Buffers, rail end stops
(1) The operating mechanism of the crane running on the track, the operating mechanism of the hoisting machine and the trolley should be equipped with buffers. Buffers can be mounted on cranes or on track end stops. The stop device at the end of the track should be firm and reliable to prevent the crane from derailing.
(2) The buffer has the good performance of absorbing the energy of the moving mechanism and reducing the impact. It mainly includes hydraulic type, polyurethane or rubber material, and spring type.

Track cleaning device
When materials may accumulate on the track and become an obstacle to operation, custom top running crane price and lifting trolleys traveling on the track should be equipped with track cleaning devices under their trolley frames (or end beams) and trolley frames. The gap between the bottom surface of the rail plate and the top surface of the track is generally 5mm~10mm.

Wind-resistant anti-slip device
(1) There are three main types of wind-resistant and anti-skid devices for custom top running crane price such as port machinery and outdoor gantry cranes, namely rail (wheel) clamps, anchoring devices and iron shoes. Tall outdoor cranes should also be equipped with anemometers and wind speed alarm devices. When the wind force is greater than the wind speed set value calculated in the working state, an alarm signal should be issued.
(2) Crane users should formulate management standards for the use and maintenance of windproof and anti-skid devices. Inspections and repairs should be carried out before the typhoon season every year, and deficiencies should be replenished in a timely manner; annual typhoon prevention drills should include the operation of windproof devices and equipment.

Interlock protection
(1) The doors for entering heavy duty top running crane factory and gantry cranes, the hatch doors for boarding the bridge from the driver’s cab, and the doors for boarding the trolley should be equipped with interlocking protection devices.
*When the door is opened, the operating mechanism of the crane cannot be started. ​
*When the driver’s cab is located in the moving part, an interlocking protection device should be installed at the entrance to the driver’s cab. When the door of the passageway is opened, the operating mechanism of the crane cannot be started.
(2) The rail clamp and anchoring device of the industrial top running crane manufacturers should be able to interlock with the operating mechanism. When the rail clamp is required to clamp the rail, or the anchoring device is anchored, the operating mechanism of the crane should automatically cut off the power and can only be turned on when it is turned on.

Other safety protection devices
(1) Deflection adjustment and display device: It should be ensured that for large-span gantry cranes and loading and unloading bridges, when the outriggers at both ends are deflected due to different forward speeds, the deflection situation can be indicated to the driver, so that the deflection can be Get adjusted.
(2) Level: should have good performance for checking the inclination of cranes with outriggers, such as truck cranes, etc.
(3) Protective covers/rails should be installed on exposed moving parts on the crane that may cause injury, such as open gears, transmission wheels, chains, pulleys, etc.
(4) Electrical protection: The top running crane should be equipped with electrical protection devices such as short-circuit and over-current (overload) protection, over-voltage and loss-of-voltage protection, zero-position protection, and power supply interruption and wrong-phase protection. The hoisting mechanism of the crane adopts thyristor stator voltage regulation, eddy current braking, energy consumption braking, thyristor power supply, and DC unit power supply. Overspeed protection devices must be installed. In addition, cranes with a rated lifting capacity greater than 20t that are used to lift molten metal should also be equipped with overspeed protection devices.
Note: The material comes from the Internet. If there is any infringement, it will be deleted. For more industry information, you can follow the WeChat public account Engineering Heavy Machinery Industry News and Heavy Machinery Information Platform.