Differential opening and closing mold balance loop, opening and closing mold control method and vulcanizing machine

Abstract

The invention provides a differential opening and closing mold balance loop, an opening and closing mold control method and a vulcanizing machine. The differential opening and closing mold balance loop comprises a three-position four-way proportional valve, a balance valve and an opening and closing mold oil cylinder. An electromagnetic ball valve is connected between an oil way connected to a rodcavity of the opening and closing mold oil cylinder and the oil way connected to one end, far away from the opening and closing mold oil cylinder, of the balance valve, and the oil way connected to the rod cavity of the opening and closing mold oil cylinder is connected to a main oil return way through a pipeline and a normally-opened small-caliber electromagnetic seat valve. Pressure of the balance valve is properly lowered, and the pilot pressure is enough to open the balance valve during quick mold closing so that mold closing shaking is effectively overcome, less energy is stored in a lower cavity of the oil cylinder, and bounce-up does not occur when mold closing is stopped. When mold opening action is stopped, the electromagnetic seat valve is used for releasing pressure at a certain speed so that a heavy hanging mold does not slide down any more when being stopped, a light hanging mold does not rebound or only slightly rebounds when being stopped, and stability and accuracy ofmold opening and closing are realized.

Description

technical field [0001] The invention relates to the technical field of hydraulic control of vulcanizing machines, in particular to a differential opening and closing mold balance circuit, a mold opening and closing control method and a vulcanizing machine. Background technique [0002] In the mold opening and closing hydraulic circuit of the vulcanizer, for safety reasons, it is necessary to directly install a balance valve on the lower cavity of the vulcanizer mold opening and closing cylinder. The pilot port of the balance valve is connected to the upper cavity of the cylinder, and the balance valve The opening can only be controlled by the pressure of the upper cavity, which can not only avoid accidental mold closing, but also prevent the two mold opening and closing cylinders from being out of sync. With the technical development of vulcanizing machines and customers' pursuit of production efficiency, the mold opening speed can be effectively improved through differentia...

AI Technical Summary

Problems solved by technology

[0006] 3) Rebound when stopping: The way to overcome the second defect is generally to increase the set pressure of the balance valve, but when the mold is light or there is no mold, due to the large amount of energy stored in the lower cavity, there will be rebound when the mold closes and stops

[0007] For defects 1 and 3, the pressure of the balance valve needs to be lowered; for defect 2, the pressure of the balance valve needs to be increased; in addition to the weight of the mold, the proportional valve should be opened smaller and larger, and it is difficult to adjust the balance valve to the optimal pressure

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