Problems in equipment maintenance materials and accessories

1. Without checking the quality of new parts, the problem of failure after assembly is more common.

Before replacing the parts, some maintenance personnel do not perform technical inspection on the new parts and install them directly on the device. This is unscientific. At present, the quality of parts sold on the market is uneven, and some fake and inferior parts are mixed. Because of the long inventory time, the performance of the parts has changed. If they are not tested, they often cause failure after assembly. Therefore, be sure to perform the necessary inspection tests before replacing the new parts. The inspection includes appearance and performance tests to ensure that the new accessories are fault-free and eliminate unnecessary trouble caused by them.

2. Do not pay attention to the accessory model, the replacement or misuse of accessories is more common.

Substitution or misuse of accessories is still common when servicing equipment. Emergency replacement of some accessories is feasible, but long-term use is harmful and unhelpful, affecting the safety and technical performance of the equipment. Some maintenance personnel do not know much about the mechanical structure and principle, and many spare parts models do not match, but they think that as long as they can be installed, they do not consider whether the mechanical performance of the machine can be used; replace defective products with defective products, and use iron wires and nails. Instead of cotter pins, use steel bars, Iet bolts instead of cylindrical pins, etc. The quality cannot be guaranteed, and long-term use is never allowed. Therefore, when repairing the equipment, you should use the original model accessories as much as possible, and you cannot substitute other types of accessories, let alone misuse; it is not uncommon to replace the components in pairs and in sets.

There are many components on the equipment, such as the plunger pair, fuel valve pair, and injector needle valve assembly of the diesel generator fuel system. These matching components are specially processed and milled in pairs at the factory. They should always be used in pairs throughout their lifespan and must not be interchanged. Some components that cooperate with each other, such as pistons and cylinder liners, bushes and journals, are relatively well matched after a period of running-in and use. When repairing, you should also pay attention to assembling in pairs and avoid stringing. These machines use a set of accessories at the same time. If damage occurs, they must be replaced in sets. Otherwise, due to the large differences in the quality of the accessories, the difference in the old and the new, and the different lengths and sizes, it will cause unstable operation of the equipment and early replacement of the replacement parts. In actual maintenance work, it is not uncommon for some people to reduce the cost and some people do not understand the technical requirements. It is not uncommon to replace the above-mentioned parts in pairs or in sets. This reduces the quality of equipment maintenance, shortens the life of the parts, and increases the possibility of failure. Should attract sufficient attention.

3锛 The use of gaskets is not standardized, and the phenomenon of random use still exists.

There are many types of gaskets used between the mating surfaces of equipment parts. Commonly used are asbestos pads, rubber pads, cardboard pads, cork pads, felt pads, non-ferrous metal pads (copper pads, aluminum pads), and copper (steel) asbestos pads. , Insulation pad, spring pad, flat pad, etc. Some are used to prevent oil, water, air, and electricity leakage between the mating surfaces of parts, and some play a role of fastening and preventing loosening. There are different regulations and requirements for the timing and occasions of each type of gasket. In the maintenance of equipment, the use of gaskets is not standardized or even used arbitrarily, which often causes leakage between the mating surfaces, and the bolts and nuts are loosened and loosened by themselves. Off, affecting the normal use of the device. If the generator cylinder gasket is too thick, which results in a reduction in compression ratio and difficulty in starting the engine; copper gaskets should be used between the mating surface of the injector and the cylinder head. If asbestos gaskets are used instead, it is easy for the injector to dissipate due to poor heat dissipation. Therefore, when maintenance personnel repair the equipment, keep in mind that “the gasket is small but useful.”