Braking valve bank, hydraulic system having same and concrete spreader

Abstract

The invention discloses a braking valve bank, which comprises an energy accumulator, a pressure detector, a liquid charging valve, a one-way valve and a working valve, wherein the energy accumulator is used for storing oil; the pressure detector is used for detecting the pressure of the oil in the energy accumulator; the liquid charging valve is arranged on a liquid charging oil path of the energy accumulator, and is used for charging liquid into the energy accumulator; the one-way valve is used for locking the oil in the liquid charging oil path and preventing the oil from reflowing; the working valve is arranged on a working oil path of the energy accumulator, and is used for controlling the oil of the energy accumulator to be released; and two independent oil paths, i.e.,, the charging oil path of the energy accumulator and the working oil path of a brake. The invention further discloses a hydraulic system having the braking valve bank and a typical operation machine, i.e., a tower type concrete spreader having the hydraulic system. The braking valve bank can be applied to braking, clamping, pressure keeping, and the like.

Description

technical field [0001] The invention relates to a brake valve group, and also relates to a hydraulic system and concrete distributing equipment with the brake valve group. Background technique [0002] At present, the booms of concrete pump trucks and placing machines are slewing through hydraulic slewing reducers and slewing supports. The hydraulic slewing reducer is driven by a hydraulic motor. The hydraulic slewing reducer has its own brake. According to whether the brake is in the braking state when stopping, the brake can be divided into two types, namely normally open and normally closed. [0003] Normally open brakes work on the principle of spring release and hydraulically applied braking. When the machine is not working, relying on the spring force, the brake is released, and the boom can rotate freely under the action of external force disturbance, such as wind load. If the brake brakes, the hydraulic system needs to provide pressure oil to enter the brake to o...

AI Technical Summary

Problems solved by technology

[0013] The solutions in the prior art have the following defects: (a) the telescopic movement of each oil cylinder of the distribution machine and the braking of the rotary reducer will interfere with each other and cannot work independently of each other, and the pressure oil from the oil pump cannot be supplied to each oil cylinder and the rotary reducer at the same time; (b) When the boom oil cylinder stretches and moves for a long time, because any hydraulic components will leak, the oil pressure in the brake of the slewing reducer will slowly drop, and reliable braking cannot be achieved, which has potential (c) Due to the back pressure of the throttle valve, the energy consumption of the system is large, and the heat of the oil is large, which affects the life of the hydraulic components; (d) If the machine needs to be braked after the machine stops, the system cannot provide Pressure fluid required for braking

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