High-flow direct-drive digital servo valve

Abstract

The invention belongs to the technical field of hydraulic control, in particular to a high-flow direct-drive digital servo valve which comprises a servo motor and a screw. The right end of a spool is connected with the left end of the screw through an adapting flange. A support bearing is disposed at the right end of the screw and supports the screw. The right end of the screw is connected with the servo motor through a transmission mechanism. The right end of the screw and the servo motor are both fixedly disposed on a right end cover. The servo motor receives external control commands and outputs precision control angle. The screw is driven to output precise displacement to drive the spool to slide by the servo motor. The spool and a valve sleeve open to control flow output. If the spool slides leftwards, liquid flows out of a control cavity A and flows in from a control cavity B; contrarily, the liquid flows in from the control cavity A and flows out of the control cavity B. The servo motor has excellent digital control performance, so that interference resistance and control performance of the whole valve can be improved. In addition, the spool is directly driven by the screw to slide, so that stain resistance can be improved.

Description

technical field [0001] The invention belongs to the technical field of hydraulic control, and in particular relates to a large-flow direct-drive digital servo valve. Background technique [0002] The servo valve is the core element of hydraulic control. The traditional two-stage analog servo valve relies on the front stage to drive the power stage slide valve. The front stage generally uses a nozzle baffle, a deflector jet or a jet tube servo valve. The input signal is an analog signal, which has poor anti-interference ability and poor control performance. . At the same time, there are many small apertures in the traditional pre-stage, which are difficult to process and expensive to process, and are easily blocked by tiny redundant objects, which will affect the performance of the entire system and even cause the system to fail. In view of the above-mentioned shortcomings of traditional analog servo valves, and with the development of digital control technology, the demand...

AI Technical Summary

Problems solved by technology

The traditional two-stage analog servo valve relies on the pre-stage to drive the power stage slide valve. The pre-stage generally uses a nozzle baffle, a deflector jet or a jet tube servo valve. The input signal is an analog signal, which has poor anti-interference ability and poor control performance.

At the same time, there are many small apertures in the traditional pre-stage, which are difficult to process and expensive to process, and are easily blocked by tiny redundant objects, which will affect the performance of the entire system and even lead to system failure

Images