Molding machine rotating valve device with backflow protecting function

Abstract

The invention provides a molding machine rotating valve device with a backflow protecting function. The device comprises multiple rotating valves mounted on a main shaft side by side; sealing rings are arranged near the connecting places of the adjacent rotating valves between each rotating valve and the main shaft; first cavities are independently isolated between two sealing rings; steps are arranged near the connecting places of the adjacent rotating valves and near the end of the main shaft; second cavities are formed in the connecting places of the steps and the adjacent rotating valves;exhaust holes are formed in the centers of the first cavities in the radial direction to the outer end surfaces of the rotating valves; air way channels are formed in the radial directions of the rotating valves in joints of the adjacent rotating valves; exhaust holes are formed in the top ends of all the air way channels; and multiple intake holes are distributed in the main shaft at intervals. In the use process, once one sealing ring is failed, air leaked from air ways can directly communicate with the atmosphere through the cavities and the exhaust holes. Two adjacent air way channels cannot generate mutual influence to prevent caused equipment failures, tire wastes or personal safety accidents.

Description

technical field [0001] The invention relates to a rotary valve device of a molding machine, in particular to a rotary valve device of a molding machine with the function of gas crossover protection, and belongs to the technical field of tire molding processing. Background technique [0002] The main work content of the three-drum one-step tire building machine is to automatically guide and cut the rolled tire rubber parts to a fixed length, and then paste them in a certain order to form a tire blank. The tire building process is mainly completed by the building drum, and the working steps are as follows: the sector blocks on both sides of the building drum are raised to lock the embryo steel ring, the middle drum is inflated with low pressure for pre-setting, the middle drum is inflated with high pressure for shaping, the sector blocks are shrunk and over-shaped, rolling, Both sides reverse-package capsules are inflated and reverse-packed, booster capsules on both sides are ...

AI Technical Summary

Problems solved by technology

Once this failure occurs, there will be the following hazards: 1. The air channel will malfunction due to air leakage, resulting in tire collapse, tire damage and injury to personnel; 2. The air pressure in the air channel will be unstable due to air leakage, and the setting pressure will not be stable. 3. The air channel is disordered due to air leakage, and the capsules may continue to perform uncontrolled inflation during long-term shutdown, resulting in overfilling and bursting of the capsules.

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