The invention discloses a balance valve group, which comprises a reversing valve, at least one overflow valve, at least one balance valve and at least one check valve, wherein the overflow valve is connected between an amplitude change oil cylinder and the reversing valve; the balance valve and the overflow valve are connected between the amplitude change oil cylinder and the reversing valve in parallel; the oil inlet end of the check valve is connected between the overflow valve and the amplitude change oil cylinder, and the oil outlet end of the check valve is connected to a T port of the balance valve group; the guide port of the balance valve is connected to an oil circuit between the overflow valve and the reversing valve through a control pipeline. According to the balance valve group, the size of the opening of the balance valve is kept constant, so that hydraulic oil can stably flow, the lower amplitude change speed of a telescopic arm can be kept stable, and the common phenomena of shaking and shocking in the prior art can be avoided, the returned oil of a rod cavity only needs to overcome the very small spring force of the check valve when the telescopic arm carries out upper amplitude change, and energy loss is very small.
Mechanical cantilever crane and balance valve group thereof
2015-04-01
Patent
Electronic Resource
English
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