Pulley block is a common mechanical equipment, which is widely used. For example, on the bridge crane, the pulley block of the crane is connected in series with the drum block and hook block to realize the lifting of materials. If the pulley block of the crane is seriously worn, it will speed up the scrapping of the pulley, affect the production speed, and even cause safety accidents. Therefore, the maintenance of crane pulley block is very important.
1. Pay attention to clean the track after using the pulley block of the crane every time, because in use, the steel wire rope is often coated with low-temperature lubricating oil, which will inevitably stick to the track surface of the pulley block during work. Therefore, the grease must be cleaned during maintenance to keep the track surface clean. In addition, correct the correct position of the rope pulley and transmission shaft, and add lubricating oil to the moving parts such as bearings.
2. The track cleaning work of crane pulley block needs to use neutral detergent to clean. After cleaning, the paint falling part is repaired to ensure that the pulley surface is completely covered by paint to prevent oxidation.
3. In addition, it is necessary to regularly check whether there is corrosion or burr on the steel wire. If there is any, it needs to be treated in time, otherwise it will cause serious wear to the wheel groove of the crane pulley block. Some fixed parts need to be checked for looseness and sealing parts for wear. These are the specific contents of regular maintenance and inspection of crane pulley block.
The pulley block of crane is an important lifting structure of crane. In the application process of the pulley block of crane, it can not avoid wear and tear. Therefore, after the overhaul of the required shaft hole, the shaft hole should not exceed 0.25cm, and the depth should not exceed 4mm; After installation, it shall be able to roll sensitively by hand, and the lateral swing shall not exceed D / 1000.
The pulley block of the crane shall be disassembled, cleaned and inspected for cracks. The pulley shaft shall not have cracks, the journal shall not be worn, the original diameter shall not be 30%, and the taper shall not be greater than 5%. If it exceeds this value, it shall be replaced; Check the groove shape of the pulley with the sample plate. The radial wear should not exceed 30% of the wall thickness, otherwise it should be invalid.
If it exceeds the standard value, it can be repaired. After overhaul, the bottom and side clearance should not be greater than 0.5mm, the error between the groove line and the pulley line should not be greater than 0.2mm, and the error between the rope groove and the end face should not be greater than 1mm.
In order to reduce the wear of the wire rope on the crane pulley block and reduce the binding force acting on the wheel groove, the diameter of the rope groove on the crane pulley block is slightly larger than that of the new wire rope, and the crane pulley block is worn no matter what material it is made of. The different forms of pulley wear are related to the service conditions. The more frequently the pulley is used, the more serious the wear is. As the condition of the wire rope has a great impact on the whole service life of the crane pulley block, the wire rope should also be inspected regularly, and the inspection is the burr and broken wire of the wire rope.
The abrasion of the crane pulley is caused by the wire rope cutting into the pulley. When the groove of the pulley is too narrow, the pulley will reduce the service life of the wire rope and the service performance of the newly installed wire rope, and the new wire rope will be subjected to huge radial pressure. For high-performance anti rotation wire rope, the damaged pulley is particularly destructive. The pressure will cause the wire rope to break or change the strand structure in a very short time, such as wire skipping, core running out or wave deformation. The damage of high performance anti rotation wire rope can be judged by the length difference between the core and the outer strand. According to the requirements of iso4309, the typical damage has reached the standard of scrapping. Crane owners can prevent this damage by replacing new pulleys or processing rope grooves. All used pulleys should be tested before installing new steel wire ropes. As long as the groove surface is smooth and the groove width is larger than the actual diameter of the wire rope, there is no need to repair.
The above is the relevant content of crane pulley block maintenance. In daily use, we must pay attention to the maintenance of crane pulley block to ensure that the equipment maintains a good running state, which can not only extend the service life of the equipment, but also improve the production efficiency.
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