What problems are likely to occur in the mechanical part of the automatic high-efficiency coating machine


The main machine, cleaning system, hot air cabinet, exhaust cabinet and thermostatic mixing drum of the automatic high-efficiency coating machine are all made of imported stainless steel, meeting GMP requirements.

The film core moves in a complex track continuously in a clean and airtight rotating drum, with smooth turnover and frequent exchange. The coated medium stirred by a thermostatic mixing bucket is sprayed onto the film core from the spray gun through the action of a peristaltic pump. At the same time, under the action of hot air and negative pressure, 100000 level clean hot air supplied by the hot air cabinet passes through the film core, passes through the bottom screen hole, and then is discharged from the air door, so that the medium can quickly dry on the surface of the film core, forming a solid, dense Smooth surface film, the whole process is automatically completed under the control of PLC.

All operations of the automatic high efficiency coating machine are completed on the touch screen of the computer control panel, and the operation panel is a fully sealed touch human-computer interface with reliable and stable performance

Under the action of the deflector plate agitator, the turning is smooth and the exchange is frequent, which eliminates the phenomenon of chip core falling from high places and collision, solves the problem of fragments and gouges, and improves the yield. The upper surface of the deflector of the automatic high-efficiency coating machine is narrow, which eliminates the adhesion of excipients on its surface, saves excipients and improves the quality of drugs.

There are relatively many problems in the mechanical part, such as:

1. Tugboat wear: Tugboats are the load-bearing parts of the drum and are vulnerable products. Tugboats from different manufacturers are basically the same, and the abnormal conditions are basically caused by the clamping wheel caused by the falling of screws and the necrosis of bearings, and the drum runout caused by the wear of nylon on the surface.

2. Front door: Most automatic high-efficiency coating machines are equipped with a round door structure in front. The round door is divided into left and right doors. The spray gun rack is installed on the right door. The distance between the door shaft of the right door and the bracket is long, so a fixed screw position is basically installed in the middle. However, in long-term use, the door shaft of the door with the spray gun rack is inclined, causing the whole spray gun rack to hang down, especially in the coating process, The inner spray gun is close to the drug, which means that the distance between all spray guns and the drug surface is different, which directly affects the coating quality.

3. The tilt of the spray gun rack causes that the round door cannot be closed effectively, which directly affects the negative pressure in the coating machine cavity. The long-term negative pressure is not accurate, which directly affects the coating quality.

4. Spray gun blockage: spray gun blockage is a common problem, and the formation of blockage is mainly caused by problems in the design of spray gun gas path. Some imported spray guns also have such design defects.

5. Uneven mixing: The coating solution mixing tank is designed to be convenient for cleaning. There is a large distance between the mixing blade on the mixing shaft and the bottom of the tank. If the distance is close, the mixing blade cannot be taken out for cleaning. There is a design defect.

6. Wind speed and air volume: previous automatic high efficiency coating machines basically did not have devices to detect wind speed and air volume. Some of them were installed with wind speed and air volume meters, but only the wind speed could be seen. The air volume needs to be calculated.

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