The spinning pump needs frequent maintenance and maintenance, so that all operations will not damage the accuracy of the parts, can not scratch the joint surface, can not oxidize and reduce the hardness. The replaced spinning pump must be cleaned by reusing the remaining melt, and the following five methods are used to remove the remaining melt.

Calcination

The calcining method, also called melting and burning method, is to heat the pump to 420-450°C in a special electric furnace to decompose the carbonized residue at high temperature.

The calciner can be disassembled or calcined as a whole. Dismantling can shorten the calcination time, especially for the overlap pump. Since the high thermal conductivity of molybdenum-containing high-speed steel is small, the heating rate of the electric furnace during calcination cannot be higher than 100°C/h, and the temperature in the furnace must not be strictly controlled to exceed 450°C. Otherwise, the high temperature will cause the hardness of the pump to drop or cause deformation. Destroy the accuracy of the pump.

The disadvantage of this method is that the heating is not uniform enough and the operating conditions are poor.

Salt bath method

The pump changed on the spinning machine was disassembled, placed in a hanging basket and hung in a salt bath to clean it.

There are two types of salt bath: one is a two-component salt bath of sodium nitrite and sodium nitrate with a ratio of 1:1, and the other is potassium nitrate, sodium nitrate and nitrous acid with a ratio of 53:7:40. Sodium salt three-component salt bath. At 300-400 °C, salt bath treatment 1-2h, the parts of the pump can be cleaned. The advantages of this method

The point is that the temperature is easy to control evenly, and the pump in the salt bath is isolated from the air, making the surface less susceptible to oxidation.

However, the salt bath consumption of this method is large, the effect is reduced with a long time, and there is a certain degree of corrosion.

Triethylene glycol method

The pump was immersed in a triethylene glycol bath and heated to 260°C for washing. Due to the reaction of triethylene glycol with polyester, it was dissolved or swollen and removed.

The components processed by this method can play a role in protecting accuracy and smoothness, but the processing time is longer than 24 hours.

Fluidized bed method

Put a certain number of meshes of Al2O3 powder into a fluidized bed and heat it up to 300°C. Disassemble the pump, place it in a hanging basket and hang it in a fluidized bed. The fluidized bed throws high-temperature Al2O3 powder on the pump's parts to make the pump The polymer undergoes an oxidation reaction.

Compared with the calcination method, this method increases the heat transfer medium, shortens the processing time and lowers the processing temperature.

Vacuum calcination

Calcining in a vacuum system can reduce the processing temperature and accelerate the reaction. After the above method is processed, ultrasonic cleaning can be used again.

Each method has its own advantages, but there are also certain limitations. The actual operation should be based on the existing material conditions, select the appropriate cleaning method.

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