FIELD: mechanical engineering.
SUBSTANCE: present description of the invention relates to the technical field of hydraulic control systems, it discloses a multistage hydraulic speed control system and a hydraulic support. In the multi-stage hydraulic speed control system described in the embodiments of the present invention, control over various states of the first reversing valve and the second reversing valve enables to realize three working states of the piston rod of the hydraulic cylinder, namely differential extension, slow extension and reverse stroke.
EFFECT: control of the multi-stage speed control system is provided, according to the embodiments of the present invention, it is possible to improve the control accuracy of the multi-stage speed control system and improve the control accuracy of the hydraulic support with the multi-stage speed control system.
17 cl, 5 dwg
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