Loading pressure-flow compensation balance valve

Abstract

The invention discloses a loading pressure-flow compensation balance valve. The loading pressure-flow compensation balance valve comprises a balance valve body, wherein a control end cover is installed on the balance valve body, an opening K of the control end cover is used for receiving control pressure from variable-amplitude falling, and is connected with a one-way valve, a first damper, one end of a first screwed plug and a two-position two-way reversing valve through a first filter screen, the one-way valve and the other end of the first damper are connected together and connected to a control cavity of a balance valve through a second damper, one end of the balance valve is connected with a variable-amplitude oil cylinder through a balance valve opening B, the other end of the balance valve is connected with a control valve through a balance valve opening A, spring cavities of the balance valve are connected with one end of a third damper and one end of a fourth damper correspondingly, the other end of the fourth damper and a fifth damper are connected in series and then are connected with one end of a second screwed plug, a spring cavity of the two-position two-way reversingvalve and a balance valve opening Y, and one oil end of the two-position two-way reversing valve is connected with the balance valve opening B. The loading pressure-flow compensation balance valve has the advantages of being simple in product structure, low in cost, good in compensation effect and capable of being adjusted conveniently.

Description

technical field [0001] The invention relates to a load pressure-flow compensating balance valve, which belongs to the technical field of engineering machinery with a luffing mechanism. Background technique [0002] Construction machinery such as truck cranes, crawler cranes, and rotary drilling rigs all have luffing mechanisms. When the luffing mechanism is falling, because the force arm of the luffing mechanism gradually increases, the falling speed of the luffing mechanism will become faster and faster. There may even be a stall, which can easily lead to safety accidents such as rollovers. If the load pressure-flow compensation balance valve is used in the luffing mechanism system, as the luffing mechanism falls, the load pressure will gradually increase, and the flow rate of the control balance valve will gradually decrease, so as to realize the stable falling of the luffing mechanism. [0003] At present, in order to realize the stable falling of the luffing mechanism, ...

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Problems solved by technology

[0004] The compensation effect of the hydrodynamic compensation balance valve is not obvious, the flow rate decreases slightly with the increase of the load pressure, and the compensation effect is not adjustable; the balance valve adopts the servo control scheme, the compensation effect is controlled by damping, and the compensation effect is good and adjustable. Servo control is used, the product structure is complex, the parts are processed with high precision, and the cost is high

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