Coating liquid circulation system for full automatic enteric capsule coating machine

A coating liquid circulation system for a full automatic enteric capsule coating machine belongs to the technical field of capsule production devices. The system comprises a solution barrel, a water pump, a solution tank, a liquid outlet pipe and a liquid return pipe. The solution barrel is connected with a liquid inlet of the solution tank through a liquid inlet pipe and connected with a second liquid return port of the solution tank through a liquid return pipe, the liquid inlet of the solution tank is higher than the second liquid return port, a liquid outlet of the solution barrel is lower than the first liquid return port, the liquid inlet pipe is connected with the water pump, and the liquid return pipe is connected with a valve. The solution tank adopts an inner tank and an outer tank which are in sleeve fit, a porous plate is arranged in the inner tank to prevent fluctuation of coating liquid and to enable the coating liquid on the upper layer to flow stably, and strip glue dipping is facilitated. A plurality of liquid outlet holes are formed in the liquid inlet of the inner tank to enable the coating liquid to flow slowly, and the whole liquid level is small in fluctuation. The system can achieve normal liquid supply circulation and prevent solute sedimentation. A liquid supplementation barrel is utilized to supplement the coating liquid timely. The system is simple in structure, convenient to operate and capable of achieving automatic circulation and liquid supplementation.