Hydraulic Mechanical Rotary Braking Energy Recovery Device

Abstract

The invention discloses a rotation braking energy reuse device for hydraulic machines, and relates to the technical field of construction machinery manufacturing construction machinery manufacturing. A cavity A and a cavity B of a hydraulic motor are connected with a first reversing valve oil opening (P1) and a first reversing valve oil opening (P2). A first reversing valve oil opening (P) is connected with a check valve and a variable capacity oil pump. A check valve is connected between a second reversing valve oil opening (P1) and a second reversing valve oil opening (Pj) in parallel. A check valve is connected between the first reversing valve oil opening (P2) and the second reversing valve oil opening (Pj) in parallel. A check valve oil outlet is connected with the second reversing valve oil opening (Pj). A second reversing valve oil opening (P) is connected with a check valve. A check valve oil inlet is connected with an energy accumulator liquid injection opening and a two-position four-way hydraulic control valve hydraulic control end. A pilot control valve oil opening (C) and a pilot control valve oil opening (D) are connected with a first reversing valve hydraulic control end and a second reversing valve hydraulic control end respectively. The rotation braking energy reuse device can recycle rotation braking energy of a hydraulic shovel and use the energy in the starting process. The rotation braking energy reuse device has the advantage that a hydraulic system automatically recycles and uses energy without external electronic control.

Description

technical field [0001] The invention relates to the technical field of engineering machinery manufacturing, in particular to a hydraulic machinery rotary braking energy recycling device Background technique [0002] In the most common excavation and loading conditions of hydraulic excavators, each working cycle has two slewing start-up and braking processes. When slewing brakes, the back pressure generated by the overflow valve is generally used to slow down the slewing until stop. [0003] There is a rotary hydraulic control device for a hydraulic excavator, the hydraulic principle diagram is as follows figure 1 As shown, there is a hydraulic motor connected to the hydraulic control reversing valve, in which the chambers A and B of the hydraulic motor communicate with the oil ports (P1) and (P2) of the hydraulic control reversing valve respectively, and the oil return of the hydraulic control reversing valve Port (T) is connected to the oil tank, a third check valve is co...

AI Technical Summary

Problems solved by technology

[0004] This hydraulic excavator slewing hydraulic control system has the following disadvantages: 1. During the braking process of the slewing platform, the hydraulic oil in the hydraulic system overflows back to the oil tank through the overflow valve, and the kinetic energy generated by the slewing inertia is converted into the heat energy of the hydraulic oil and is in vain. Waste; 2. When the slewing platform is started, the hydraulic oil pressure in the hydraulic system has been greatly lower than the set value, and the variable oil pump needs to work for a period of time to increase the pressure of the hydraulic oil in the hydraulic system to the set value, and the hydraulic excavator can Start turning

Images