Proportional electromagnet for controlling position of valve core of hydraulic valve

Abstract

The invention discloses a proportional electromagnet for controlling a position of a valve core of a hydraulic valve. The proportional electromagnet comprises an electromagneticinduction component and an armature component, wherein the armature component is arranged in the electromagneticinduction component and is in sliding fit with the electromagneticinduction component; the proportional electromagnet is also provided with a hydraulic passage which is communicated with an upper end face and a lower end face of the armature component and forms a hydraulic loop with a valve core cavity of the hydraulic valve; a hydraulic loop is formed between the upper end face as well as the lower end face of the armature component and the valve core cavity of thehydraulic valve, so that the upper end face as well as the lower end face of the armature component and the valve core cavity of thehydraulic valve are hydraulically balanced, hydraulic disturbance is effectively eliminated, the output power of the proportional electromagnet is stably output, and the positional relation of the valve core and a valve seat of the hydraulic valve is effectively controlled; and thus, the flow velocity of oil in the hydraulic valve is controlled, the hydraulic pressure of the oil in an executing element of the hydraulic system is stably adjusted, and the hydraulic equipment stably works.

Description

technical field [0001] The invention relates to an electromagnet, in particular to a proportional electromagnet for controlling the position of a valve core of a hydraulic valve. Background technique [0002] Large-scale hydraulic equipment such as injection molding machines, excavators, and cranes require the use of hydraulic systems, which consist of power components, actuators, control components, auxiliary components and hydraulic oil. The basic working principle of the hydraulic system is: after the hydraulic oil is boosted or depressurized by the power element, it flows into the control element, and after being controlled by the control element, it is input into the actuator in a smooth and orderly manner, and the actuator converts hydraulic energy into mechanical energy. output. The control element is usually a proportional hydraulic valve, and the proportional hydraulic valve is formed by assembling a hydraulic valve and a proportional electromagnet. Proportional e...

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Problems solved by technology

When this proportional electromagnet is used to control the position of the hydraulic valve spool, since the oil in the second cavity and the third cavity are connected through the hydraulic damping hole, the oil pressure on the upper end surface and the lower end surface of the armature is balanced. At the same time, because the push rod is solid, the lower end surface of the push rod receives the oil pressure in the spool chamber of the hydraulic valve and the upper end surface of the push rod receives the oil pressure in the first cavity, so the overall oil hydraulic pressure received by the armature assembly The force is unbalanced, thereby forming a hydraulic disturbance to the armature assembly, and the output force of the armature assembly is affected. The output force of the armature assembly is no longer stable but mixed with disturbance, which makes the opening of the hydraulic valve change in disorder, resulting in the oil in the hydraulic valve. The flow rate in the medium is not stable, the oil and hydraulic pressure of the actuator changes disorderly, and the mechanical output force of the actuator is not stable; thus causing the injection molding machine to cause unstable product quality and even defective products during injection molding, while the excavator is in When excavating, the state is unstable, and the workpiece is easily damaged. The output force of the crane is not stable when lifting, and the lifting object will shake and cause accidents.

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