How To Prevent Wind And Slip in Gantry Crane?

How to prevent wind and slip in gantry crane?

Large equipment such asgantry cranes, loading and unloading bridges, gantry cranes and tower cranes usually work in the open air, with large windward areas and can withstand large wind loads. To prevent being blown over by strong winds, these devices must be equipped with reliable windproof and anti-slip devices. High winds and crane overturning accidents sometimes occur at the end of the track due to improper design or failure of wind and anti-skid devices.

When calculating wind protection and anti-skid devices, the gantry crane should remain stationary under the influence of non-working winds. In this case, the effect of brakes and wheel rims on track-side friction is not considered. At present, many windproof and anti-skid devices cannot meet the safety requirements of non-working wind pressure, and anchoring devices should be added. The anti-skid device can only be activated if the anti-skid device between the cranes cannot be activated. The locking action time of the windproof and anti-skid device should be later than the stopping time of the crane operating mechanism to avoid causing crane vibration. By rolling fine teeth on the jaws of the wind and anti-skid device, the surface is quenched, which increases the coefficient of friction and almost doubles the wind resistance.

The rail type is an automatic self-locking windproof and anti-slip device.

The horizontally arranged lever is provided with a groove, and the width of the groove is slightly larger than the width of the top of the guide rail. The other end of the lever is provided with an oval hole that matches a round tube fixed to the rail crane. Pull the handle or turn on the power to open the retaining pin and the lever will place its own weight on top of the track. Under the influence of wind, the orbital crane moves along the track. Thanks to the leverage, the cutout acts as a self-locking feature on the rail. As long as each component can meet the requirements for strength and stiffness, its wind resistance is not limited by external conditions, but the lateral force and local deformation of the track should be considered.

When the rail crane is running, you can pull the handle, use the fixed pin to lift the guide rail clamp and hold the handle; you can also connect the electro-hydraulic push rod of the cab, use the fixed pin controlled by the electromagnet to lift the guide rail clamp and hold the handle. It has the advantages of simple structure, small size, convenient use, safety and reliability. Since it has both manual and electric functions, it can be operated from the cab or when powered off.

The floating type is an improvement based on the electric screw-type rail clamp.

An improvement is to mount the slide rail clamping device on the trolley. The rail crane trolley can move automatically in the lower beam of the rail crane. Regardless of whether the track clamping device is aligned with the track, as long as the track clamping device's gripper contacts the track, the cart can move freely. And align it with the track, clamp the track. This improvement has a self-locking function. Usually, the rail clamp can only be installed freely on the rail crane, and there is no force transmission between the horizontal direction and the rail crane.

When the wind is strong enough to move the rail crane, after the rail crane has moved a short distance, the sloping surface on the outside of the fixture will match a wedge on the rail crane's lower beam to prevent the rail crane from moving. Inclined surfaces experience significant forces, are not affected by vibrations, and do not release themselves. When the rail clamp is not used, it is always between the two wedges depending on the action of the spring.

The pressure plate type is an automatic self-locking windproof and anti-slip device.

The device is equipped with a pressure plate with fine teeth. The pressure plate is connected to the track crane through a spring slider and can float freely in both horizontal and vertical directions. Hang on to the track without external force. There is a lifting roller above the pressure plate, which is controlled by a hydraulic cylinder. When the track crane is working, the hydraulic cylinder lifts the rollers and the pressure plate does not contact the track. When the rail crane is not working, the oil supply to the hydraulic cylinder stops, and the spring on the roller presses the roller to the pressure plate, causing the pressure plate to stick to the track. When the wind increases and blows away the railway crane, since the pressure plate is floating and does not move with the railway crane, the rollers fixed to the railway crane will roll along the slope of the pressure plate, thereby increasing the load on the railway. pressure and prevent the rail crane from moving. The windproof and anti-skid device is easy to operate, safe and reliable, but it is bulky and is only suitable for large railway cranes.