Electrical control system of multi-zone temperature and pressure follow-up control hydraulic machine

Abstract

The invention discloses an electrical control system of a multi-zone temperature and pressure follow-up control hydraulic machine. The system comprises a hydraulic control electrical cabinet, a heating control electrical cabinet, an oil cooler, a thermal forming hydraulic machine body special for composite materials, a cold-forming hydraulic machine body special for composite materials, a composite material special demolding hydraulic machine, a composite material special hydraulic machine hydraulic station, a mold drawing trolley, a mold changing trolley, a piano type operation table, a centralized operation panel, a displacement sensor, a pressure sensor, an absolute value encoder, a PLC module installed in an electrical cabinet, an intermediate relay, an SEW frequency converter, an electromagnetic valve and a human-computer interface. In the whole process of molding and demolding of the composite material, according to the influence of the temperature on parameters and raw materials, the whole production process of the product is automated through the measures of partitioned heating, change of the heating temperature along with time and change of the pressure along with the temperature, and the percent of pass of the product is greatly improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic press control for composite materials, in particular to an electrical control system for multi-zone temperature and pressure follow-up control hydraulic presses. Background technique [0002] The special hydraulic press for composite materials is mainly used for the production and processing of composite material products such as SMC, LFT, and radiation-proof bricks; this kind of special hydraulic press has the following consensus defects in the process of pressing and forming FRP and radiation-proof brick products: [0003] (1) During the heating and forming process of SMC and LFT products, as the temperature rises, the colloidal solid raw materials will thermally expand during the melting process, resulting in an increase in the pressure originally loaded on the mold, resulting in uneven wall thickness of the product The phenomenon of uniformity and inconsistent density; [0004] (2) During t...

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Problems solved by technology

[0003] (1) During the heating and forming process of SMC and LFT products, as the temperature rises, the colloidal solid raw materials will thermally expand during the melting process, resulting in an increase in the pressure originally loaded on the mold, resulting in uneven wall thickness of the product The phenomenon of uniformity and inconsistent density;

[0004] (2) During the thermoforming process of the anti-radiation brick, as the temperature rises, the powder gradually melts into a jelly, the molecular gap becomes smaller, and the volume shrinks accordingly, resulting in a smaller pressure originally loaded on the mold, resulting in a product Uneven thickness and insufficient density;

[0005] (3) During thermoforming, if the melting speed of raw materials is too fast or too slow during the melting process, the product will be unqualified. If the melting speed is too fast, bubbles will easily be generated inside the product; if the melting speed is too slow, the melting state of the raw materials will be uneven. , the physical change of the material is not sufficient, causing the product to be unqualified;

[0006] (4) After the thermoforming is completed, the process of transporting the semi-finished product to the cold-press forming machine requires a lot of energy and material resources, and the transportation and installation time is too long. The semi-finished product is not subjected to corresponding external pressure during this period. As a result, the thickness of the product is larger than the actual demand, and it is prone to cracks;

[0007] (5) During the cooling process of the anti-radiation brick product, as the temperature drops, the jelly semi-finished product gradually solidifies into a solid state with the temperature drop, and the volume becomes larger, which also leads to a thicker product than the actual demand;

[0008] (6) After the composite material is cooled, the finished product is generally embedded in the mold, which is difficult to demould, time-consuming and labor-intensive; if the vibration is too large during the demoulding process, the product is prone to cracking and damage;

[0009] (7) In the manufacturing process of composite materials, the process is relatively complicated, the manufacturing process cycle is long, and it is difficult to achieve one-time molding with a single hydraulic press

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