Displacement amplifying type 2D electro-hydraulic proportional directional valve

Abstract

The invention provides a displacement amplifying type 2D electro-hydraulic proportional directional valve. The displacement amplifying type 2D electro-hydraulic proportional directional valve is that the right end of the 2D valve is fixedly connected with a bidirectional electric-mechanical conversion device through a roller type pressing torsion coupling and a pin; a wedge-shaped part is in contact with a central shaft through a roller; a right sensitive cavity is formed between a right circular bead at the end part a valve element, an end cover of the pressing torsion coupling and a valve body; a left sensitive cavity is formed between a left circular bead at the end part of the valve element, a left piston ring and the valve body; high pressure holes are formed in the circular beads at the end parts and are communicated with a P opening through inner holes of the valve element; low pressure holes are formed in the end part of the valve element and directly communicated with the T opening; sensitive channels of which the diameter is in a form of a semicircular section are formed in the upper two ends of the inner hole wall of the valve body; the sensitive channels are respectively communicated with the left sensitive cavity and the right sensitive cavity; the high and low pressure holes in the circular beads in two ends of the valve element are intersected with the sensitive channels to form two micro opening areas which are connected in series to form hydraulic resistance half axles; pressure of the sensitive cavities in two ends is respectively controlled by the hydraulic resistance half axles at two ends.

Description

technical field [0001] The invention belongs to an electro-hydraulic proportional valve in the field of fluid transmission and control, in particular to an electro-hydraulic proportional reversing valve. Background technique [0002] The electro-hydraulic proportional control technology is a hydraulic control technology between the switch-type electro-hydraulic system and the electro-hydraulic servo system. The electro-hydraulic proportional valve is a hydraulic valve that continuously and proportionally controls the pressure, flow and other parameters of the oil according to the input electrical signal. It can not only realize complex control functions, but also has the advantages of strong anti-pollution ability, low cost, and fast response. In hydraulic control engineering, electro-hydraulic proportional directional valves can directly replace electro-hydraulic servo valves for load control in many occasions. Position, speed, and force control, it can be combined with el...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the "stuck" phenomenon of the main valve and the pilot valve of the electro-hydraulic proportional valve, the failure of the pilot control oil circuit to lose pressure or the pressure is too low, and the large leakage flow of the pilot control stage, and to achieve high pressure and large flow two-way proportional control, this The invention provides a displacement amplified 2D electro-hydraulic proportional reversing valve, which can adopt a proportional electromagnet with two-way action (with push and pull two-way drive function) or other linear electro-mechanical converter with two-way action, and can switch the two The pressure torsion coupling on the side is installed on the same side as the electro-mechanical converter, which can also realize the function of bidirectional proportional control. This structure is suitable as a screw-in cartridge type 2D electro-hydraulic proportional directional valve

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