repair methods of gantry crane

What are the Repair Methods for Common Faults of Gantry Cranes?

Gantry crane is a kind of deformation of bridge crane, which is mainly used for outdoor loading and unloading work of cargo yard, yard cargo and bulk cargo in harbour. Its metal structure is gantry frame, bearing the main beam under the installation of two legs, can be directly on the ground on the track, the main beam can have an outreach cantilever beam at both ends.

The service life of the gantry crane is generally 10-15 years, usually should also do a good job of routine maintenance. Daily maintenance is done better, the gantry crane will have a better use of the actual effect, there will be a longer period of time, naturally, this does not mean that after a good maintenance will not be prone to problems. When some common failures are found should also be able to do a good job immediately overhaul. Gantry crane overhaul generally how to do?

7 kinds of gantry crane common failure maintenance method

1. Maintenance measures for the wire rope

Firstly, when the crane is working, it is not allowed to load more than the specified rated weight, and at the same time, it is necessary to install the lifting capacity limiter device on the machine. Secondly, according to the type of work of the crane and the environment to choose the appropriate wire rope, due to the double winding rope manufacturing than a single flexure is better, and therefore more widely used in practice. In the use of steel wire can be twisted into strands, and then by the strands around the core of the rope to be twisted into a rope. In practice, the commonly used core is hemp core, but metallurgical cranes often use metal core steel wire or asbestos core to work, and in the production of rope before the need for lubricating oil to dip the core, so that you can reduce due to friction between the steel wire rope and produce damage. The third is in the rise or fall, the action should be as gentle as possible, and try to avoid sudden impacts due to the instantaneous load of the wire rope becomes large, and in the normal course of time also need to regularly to the maintenance of the wire rope, and do a good job of its lubrication.

2. Maintenance of reduction gear

First of all, in the actual work, if from time to time specific circumstances, it is prohibited to suddenly let the crane to fight against the car, and also can not be overloaded to use the crane, in the crane startup and braking when the action should be smooth and slow. The second is to check the lubricant cleanliness of the crane, if the lubricant is found to be not clean enough, it must be replaced in a timely manner. The third is in the use of lubricants, according to the actual situation to choose the right type, and in general to replace the lubricant in a timely manner, to ensure that the crane shell clean and clean.

3. Maintenance methods for track system failure

In order to avoid the emergence of track system failure problems, users of gantry cranes in the crane installation stage, the need to let the track to meet the crane use process may occur in a variety of working conditions. If it is found that the length of the track from the stop end is less than 15 metres, it is necessary to replace the track greater than 15 metres in order to be firm and stable and safe. During the daily maintenance of lifting equipment, maintenance personnel need to reinforce the loose parts of the track line in a timely manner. If the lifting equipment running track bending deformation problem is more serious, the relevant personnel need to cut off the problem line, and timely completion of the line replacement. In order to avoid the appearance of track height difference problem, maintenance personnel can use total station to carry out track height difference measurement. In the case of track height difference is difficult to meet the operational needs of gantry cranes, maintenance personnel can be added by adding zone heating pads, adjusting the track spacing.

4. Wheel set failure maintenance methods

In the process of wheel failure, the relevant personnel need to complete the measurement of wheel rim thickness and wheel tread radius in time. After the end of the measurement work, the relevant personnel can compare the actual measurement results with the factory certificate of conformity, and timely replacement of wheels that do not meet the test requirements. In order to solve the problem of wheel gnawing rail caused by large and small car offset, maintenance personnel need to adjust the brake release gap and release the timing of the brake. In order to ensure that the lifting equipment size of the car in the middle of the track position, lifting equipment, the use of lifting equipment units also need to standardise the use of gantry cranes, and in the process of using the equipment to strictly eliminate the emergence of crooked pulling and slanting lifting problems.

5. Brake failure maintenance methods

In order to solve the brake failure problem of the gantry crane, the relevant personnel need to regularly check the crane hoisting brake, trolley brake and trolley brake. After the brake is released, the lifting equipment brake tile can not be in contact with the brake wheel friction (in the lifting equipment brake, the brake tile needs to be uniform contact with the brake wheel). In order to ensure the normal use of lifting equipment, lifting equipment brake wheel oil and other impurities that may affect the braking function of the equipment needs to be removed in a timely manner. If the brake pads and brake wheels appear scratches (or serious wear), the relevant personnel need to be replaced in a timely manner.

6. Maintenance method of wire rope failure

In order to solve the problem of wire rope failure, maintenance personnel need to appropriately increase the use of wire rope inspection efforts. If the wire rope has reached the end-of-life conditions, the relevant units need to immediately with the same material and the same type of wire rope used in lifting equipment. For lifting equipment wire rope and rope clip problems, the relevant personnel need to inform the maintenance staff of the requirements, maintenance personnel need to apply standardised rope pressure plate installation. The use of gantry cranes need to avoid lifting heavy loads at a fixed height, so that the effective use of the wire rope interval to achieve uniform tension. In the process of wire rope replacement, the relevant personnel also need to pay attention to the twisting direction of the wire rope and the winding direction of the wire rope on the reel.

7. Maintenance of Electrical Component Failures

In order to avoid the emergence of electrical problems such as the failure of the wrong phase protection relay shorting problem and the failure of the limit switch action. The use of gantry cranes need to verify the function of electrical switches and relays in a timely manner, after the failure of the problem, the relevant personnel need to complete the replacement of the relevant components in a timely manner. After the gantry crane is put into use, the relevant personnel also need to avoid the problem of man-made short switch. In order to ensure the safe operation of the grounding system, maintenance personnel need to measure the grounding resistance of the crane in a timely manner (e.g., 1 inspection every 2 years). In general, there is a certain difference between the resistance value of different grounding systems for gantry cranes. If the system used in portal cranes is TN system, the resistance value of the system is required to be no more than 10 Ω. If the grounding system used in portal cranes is TT system and IT system, the resistance value is required to be within 4Ω. After the grounding system damage problems, the relevant units need to check the grounding system in a timely manner.

The above seven points are the common fault types of gantry cranes and the corresponding maintenance methods. I hope they will be useful to you.