Plunger type leveling hydraulic system with movable beam of large hydraulic machine

Abstract

The invention discloses a plunger type leveling hydraulic system with a movable beam of a large hydraulic machine, and relates to the field of large hydraulic machines. The plunger type leveling hydraulic system with the movable beam of the large hydraulic machine comprises the movable beam, first leveling plunger cylinders, second leveling plunger cylinders, a first two-position two-way electromagnetic valve, a second two-position two-way electromagnetic valve, a third two-position two-way electromagnetic valve, a first two-position two-way plug-in proportional valve terminal, a second two-position two-way plug-in proportional valve terminal, a third two-position two-way plug-in proportional valve terminal, a fourth two-position two-way plug-in proportional valve terminal, a proportionalrelief valve and a hydraulic pump. The diagonal vertexes of the movable beam are provided with the four leveling plunger cylinders: the first leveling plunger cylinders and the second leveling plungercylinders. According to the plunger type leveling hydraulic system with the movable beam of the large hydraulic machine, the stroke of the plunger cylinders is twice of the length of the cylinders, the height of equipment is prevented from being too large, and the system has the advantages of being small in size, low in pressure loss and precise in flow control.

Description

technical field [0001] The invention relates to the technical field of large hydraulic presses, in particular to a movable beam plunger type leveling hydraulic system for large hydraulic presses. Background technique [0002] Large-scale die forging presses are mainly used for hot die forging and isothermal superplastic forming of hard-to-deform materials such as titanium alloys, high-temperature alloys, aluminum alloys, and powder metallurgy. The holding time is used to increase the density of forgings, and the overall performance of forgings is improved by refining the grains, so as to achieve the goal of less machining or near-net shape. Large-scale die forging presses are mainly used in the aviation field, such as the main bearing frame of aircraft Large die forgings such as landing gear, beams, etc. require large die forging presses for hot die forging and isothermal superplastic forming. [0003] The large-scale die forging press adopts the main drive synchronous hydr...

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Problems solved by technology

[0003] The large-scale die forging press adopts the main drive synchronous hydraulic system, which has a certain ability to coordinate output, multi-cylinder synchronization and stable operation, but due to the uneven material of the workpiece, the manufacturing error of each cylinder, the nonlinearity of the hydraulic system and components, and the The gap between the beams causes the movable beam to deflect, resulting in insufficient filling of the forgings, low precision of the forgings, and even affects the life of the press equipment. In addition to the main drive synchronous hydraulic system, a large die forging press also needs to be equipped with a passive leveling hydraulic system. At present, diverter valves, throttle valves, speed control valves or mechanical synchronization are mostly used to achieve passive leveling of the movable beam, and all of them use double-rod piston cylinders. This way of throttling loss and speed control valve decompression loss is relatively low. Large, low system efficiency, the stroke range of the double-rod piston cylinder is three times the length of the piston cylinder, which increases the height of the equipment

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