Steering flow distribution multi-way valve structure adopting closed-loop control

Abstract

The invention discloses a steering flow distribution multi-way valve structure adopting closed-loop control. The multi-way valve structure is characterized by comprising a solenoid valve (1), a first-stage DDV (2), a second-stage DDV (3), an overflow valve (4), a safety valve (5), a pressure maintaining valve (6) and a controller (7), wherein the connection of the hydraulic part is that an oil inlet is connected to the solenoid valve (1) through the pressure maintaining valve (6), and then connected to an oil inlet of the first-stage DDV (2); two control cavities of the first-stage DDV (2) are connected to both ends of a valve core of the second-stage DDV (3), and the control cavity of the second-stage DDV (3) is connected to a steering cylinder; the connection of the electric control part is that the controller (7) is connected to the solenoid valve (1), and used for controlling the opening and closing state of the solenoid valve (1), so that the effect of normal control or troubleshooting of a branch is achieved; and the controller (7) is connected to the first-stage DDV (2) and the second-stage DDV (3). According to the multi-way valve structure disclosed by the invention, an electric control method is adopted, and different requirements of different users for the steering function can be met through adjusting control parameters; and at the same time interfaces are provided for achieving automation and intelligentization of complete vehicles of engineering machinery.

Description

1. Technical field [0001] The invention belongs to the design of a new hydraulic structure in the field of engineering machinery, and in particular relates to a hydraulic structure replacing the traditional steering flow distribution. 2. Background technology [0002] Traditional construction machinery steering flow distribution relies on hydraulic control rotary valves to achieve flow distribution. The pilot oil circuit is distributed through the pilot valve, and the distributed flow acts on both ends of the rotary valve to control the axial movement of the rotary valve, thereby realizing the steering flow distribution. With the pilot valve, accurate flow control cannot be achieved, and the steering speed control is completely dependent on the operator or the speed is uncontrollable. [0003] The invention proposes a new structural scheme to replace the original steering flow distribution structural scheme, and realizes the closed-loop control of receiving electric signal ...

AI Technical Summary

Problems solved by technology

With the pilot valve, precise flow control cannot be achieved, and the steering speed control is completely dependent on the operator or the speed is uncontrollable

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