Daily maintenance of QU70 crane rails is essential. Here are some of the main maintenance methods:
Cleaning the rails: Regularly use tools such as brooms, vacuum cleaners or high-pressure water guns to remove dust, oil, iron filings and other debris from the rail surface. These debris may affect the contact between the crane wheels and the rails, resulting in unstable operation and even accelerated rail wear. For stubborn stains such as oil stains, special cleaning agents can be used for cleaning.
Check the wear of the rails: Regularly measure the key dimensions of the rails, such as rail head width, rail waist thickness, etc., with professional tools such as calipers and rail profilers, and compare them with the original dimensions to determine the degree of wear. At the same time, observe whether there are obvious wear marks, peeling, abrasions and other defects on the rail surface. Generally speaking, when the rail head wear exceeds the specified value (such as 10% - 15%), it is necessary to consider taking repair or replacement measures.
Detect the flatness and straightness of the rails: Use equipment such as levelers and laser rangefinders to detect the flatness and straightness of the rails. The unevenness of the track should be controlled within the allowable range, usually not exceeding a certain number of millimeters per meter (such as 2-3 mm). For straightness, it can be detected by pulling steel wire or using a total station. If the deviation is too large, it should be adjusted in time.
Check the connection parts of the track: carefully check whether the connection bolts, splints and other parts of the track are loose, damaged or missing. The connection bolts should be tightened regularly to ensure that the torque meets the specified requirements. If the splint is found to be cracked or deformed, it should be replaced in time to ensure the firmness and stability of the track connection.
Lubricate the track: Lubricate the track regularly according to the use and environmental conditions of the track. Generally, special track grease can be used to apply it to the surface of the rail head and the contact part of the wheel. Lubrication can reduce the friction coefficient, reduce wear, and also help prevent rust. However, care should be taken to avoid grease contaminating the surrounding environment and prevent excessive grease from absorbing dust and other debris.
Deal with damage to the track surface: For small area damage on the track surface, such as slight pits and scratches, it can be repaired by grinding to restore the track surface to smoothness. However, be careful to control the amount of grinding during grinding to avoid excessive grinding that will cause the track size to not meet the requirements. For more serious damage, such as deep cracks, it is necessary to promptly perform welding repairs or replace track components.
Check the drainage system: Ensure that the drainage system around the track is unobstructed and avoid water accumulation. Water accumulation will accelerate the corrosion of the track and reduce the service life of the track. Regularly clean up the debris in the drainage trough and drainage ditch, check whether the drainage slope meets the requirements, and promptly dredge and repair if there is blockage or poor drainage.