Multilayer thermal press hydraulic servo system with synchronous speed, position and pressure control

Abstract

The invention discloses a multilayer thermal press hydraulic servo system with synchronous speed, position and pressure control and belongs to the technical field of artificial board machinery. The technical key points are that a thermal press multi-cylinder movement synchronous hydraulic servo loop is provided with a four-way electro-hydraulic servo valve; a thermal pressboard closing position precision adjusting hydraulic loop is provided with a three-position four-way solenoid directional valve connected with a servo hydraulic cylinder; the thermal pressboard closing position precision adjusting hydraulic loop is provided with a pressure sensor; and the pressure sensor is connected with a second hydraulic pump and the servo hydraulic cylinder. Hydraulic servo control technology is adopted and combined with the functions of all loops in the multilayer thermal press hydraulic servo system, the movement states of the servo hydraulic cylinder in different stages of board blank pressingare controlled, the synchronous movement precision of the servo hydraulic cylinder and the closing position precision and pressure of a thermal pressboard are controlled and adjusted precisely, onlinemonitoring of operation states of all hydraulic elements is achieved, the thickness precision and board quality of the board blank pressed by a multilayer thermal press are improved, and stability and reliability of work of the multilayer thermal press are ensured.

Description

technical field [0001] The invention relates to a hydraulic servo system of a multi-layer hot press, in particular to a hydraulic servo system of a multi-layer hot press with synchronous speed, position and pressure control, and belongs to the technical field of wood-based panel machinery. Background technique [0002] The multi-layer hot press is one of the main production equipment commonly used in the domestic wood-based panel industry at present. The basic principle of pressing wood-based panels is to use the hydraulic system to output hundreds to thousands of tons of pressure to promote the production of various wood-based panels. The raw materials (slabs) are recombined to achieve the required physical and mechanical properties. Structurally, in order to overcome the huge load generated by the production of wood-based panels, the multi-layer heat press usually uses multiple plunger hydraulic cylinders to lift the heat press plate. However, the hydraulic system of the ...

AI Technical Summary

Problems solved by technology

However, the hydraulic system of the existing multi-layer hot press usually does not have the function of flow adjustment, and it is difficult to ensure that the flow input to each hydraulic cylinder is consistent, which easily leads to deviations in its movement speed; on the other hand, due to unbalanced load force, etc. The reason will also affect the oil flow into the hydraulic cylinder, which in turn will affect its movement speed

The inconsistency of the movement speed of the hydraulic cylinder will inevitably cause the hot platen of the multi-layer hot press to tilt when it rises, and the position deviation will occur after closing, and even cause the hot platen to be stuck during the rising process and cannot be closed. Serious Affects the thickness accuracy and plate quality of pressed slabs

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