The plan and pre repair of cutter suction dredger can not only prevent the accident, but also save the maintenance time, which is conducive to improve the utilization rate and economic benefit of the dredger. However, its superiority is closely related to the actual choice of repair. The traditional principle is to take the effective use time of dredger as the index. When the dredger machinery reaches the specified service life, it is to carry out preventive maintenance. Therefore, it is the first problem to determine the repair cycle.
1. Types of repair work
According to the service life, repair workload and construction period of dredger equipment, the repair is traditionally divided into three categories: minor repair, medium repair and overhaul.
(1) Minor repair
The minor repair of dredger machinery and equipment is the primary stage from maintenance to repair. According to the equipment defect records found during routine maintenance, a minor repair plan is made for some problems that cannot be solved during shift handover. Repair items include defects that can be repaired within the scheduled time of minor repair, replacement of parts, lubricating grease, adjustment of clearance, etc., and some more complex inspection items shall be included. Minor repairs are frequent. For the minor repair time of each month, it can be flexibly applied, and the limit is no more than the original minor repair plan. For example, the scheduled minor repair is three times a month, and the total repair time is 32H. For example, if the minor repair is scheduled twice every time within one month and one for 16h, the total repair time is not more than 32H, but in the 16h minor repair, some difficult and time-consuming repair items can be handled. This is the case The arrangement of profit. Because the planned time of minor repair is short, minor repair is only a means to maintain simple reproduction. The cost of minor repair shall be included in the production cost of the current month by the production cost.
(2) Medium repair
Because the time of minor repair of dredger machinery and equipment is short and some defects and hidden dangers of dredger equipment that need a long time to be dealt with, it is impossible to solve them in the minor repair time, but it can not be dragged to the next overhaul to solve, so it is necessary to arrange one or several intermediate repairs between the two overhaul. The medium repair range is large and there are many projects, which are generally restorative repairs.
After a long time of use, some key parts (such as the foundation of main equipment, crane track, main motor, blast furnace shell, etc.) are damaged and cannot be repaired in a short time, so a long time of shutdown must be arranged for repair. Such repair is called major repair. According to the production practice experience and relevant statistical data, the overhaul period of some main production equipment under normal conditions can be estimated. The overhaul period depends on the maintenance quality of dredger equipment. The key problems are: one is to use the equipment in accordance with the regulations, and not to use the equipment overload; the other is to ensure the quality of overhaul construction.