Balance valve mounting seat, hydraulic oil cylinder and engineering machinery

Abstract

The invention relates to a balance valve mounting seat, a hydraulic oil cylinder and engineering machinery. The balance valve mounting seat comprises a seat body enabling a balance valve (1) to be fixed on an oil cylinder tube (2), wherein a first through hole (5) which is used for enabling the oil cylinder tube (2) to communicate with the balance valve (1) is formed in the seat body; and a valve opening is formed in the first through hole (5), and an automatic closing device (3) which is provided with an opening position and a closing position is arranged in the first through hole (5), so that the through hole (5) is optionally opened or closed. Through the technical scheme disclosed by the invention, control for opening and closing an oil path between an oil cylinder and the balance valve can be realized, so that the function of closing and locking the oil cylinder can be realized under the condition that the balance valve drops out, or the balance valve fails; accident that an arm frame suddenly falls down because hydraulic oil in the hydraulic oil cylinder is leaked can be avoided, so that the safety of a working site is improved; and besides, the balance valve mounting seat is simple in structure, low in cost and suitable for industrial application.

Description

technical field [0001] The present disclosure relates to the field of construction machinery, in particular, to a balance valve mounting seat, a hydraulic oil cylinder and construction machinery, especially a concrete pump truck. Background technique [0002] In the field of construction machinery, the telescopic or folding of the boom is inseparable from the drive of the hydraulic cylinder, and the reliability of the hydraulic cylinder is particularly critical to work efficiency and safety. Therefore, in the prior art, the hydraulic oil cylinder is mostly equipped with a balance valve that can adjust the pressure difference of the oil circuit and realize locking, so as to ensure the stability of the oil circuit and the safety of the boom work. Among them, for example, concrete pump trucks use a large number of plate balance valves, which are mainly used to adjust and balance the pressure difference on the corresponding pipelines, such as figure 1 As shown, the balancing va...

AI Technical Summary

Problems solved by technology

Among them, for example, concrete pump trucks use a large number of plate balance valves, which are mainly used to adjust and balance the pressure difference on the corresponding pipelines, such as figure 1 As shown, the balancing valve mounting seat is welded on the cylinder barrel of the boom cylinder, and the balancing valve is fixed on the mounting seat with mounting screws. The existing balancing valve mounting seat has a simple structure, but there are safety problems. During operation, when the boom is moving in the working area, the hydraulic cylinder of the boom flexion control collides with obstacles, causing the mounting screws to break, the balance valve that plays a safety role falls off, the hydraulic oil in the cylinder is sprayed and leaked, and the cylinder piston is caused to lose pressure after the cylinder loses pressure. The rod is compressed and contracted, and the boom suddenly falls, causing casualties

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