Support oil cylinder extension speed control method, and device, system and crane thereof

Abstract

The invention discloses a support oil cylinder extension speed control method, and a device, a system and a crane thereof. The support oil cylinder extension speed control device comprises a receiver used for receiving the rodless cavity pressure of a support oil cylinder, and a controller used for controlling the support extension speed according to the rodless cavity pressure of the support oil cylinder and a preset pressure, wherein the input oil quantity of the support oil cylinder is controlled through an electric proportional valve. In the invention, the support oil cylinder extension speed is controlled through treating the rodless cavity pressure of the support oil cylinder as a control basis, so the intelligent degree of the crane is improved, the support oil cylinder extension speed is improved and simultaneously the impact generated during the contact of a support with the ground is avoided, thereby the working efficiency and the operation comfortableness of the crane and the life of a support structure member are improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to a method, device, system and crane for controlling the extension speed of an outrigger cylinder. Background technique [0002] Schematic diagram of outrigger hydraulic system figure 1 As shown, the hydraulic pump 1 provides the power source for the system, and the overflow valve 6 can set the pressure of the system. The electromagnetic reversing valve 5 can be used to switch between the outrigger hydraulic branch circuit and other hydraulic branch circuits. When the electromagnet Y9 is energized, the hydraulic oil source can supply oil to the outrigger hydraulic branch circuit. The figure shows the outrigger hydraulic branch circuit of the crane. There are four hydraulic outriggers in total, and the vertical oil cylinder 3 is connected with the outriggers, so that the extension and retraction of the outriggers can be realized. The two-way hydraulic lock 2 can be used to loc...

AI Technical Summary

Problems solved by technology

[0006] In the above outrigger hydraulic system, since the extension and retraction of the vertical cylinder is controlled by the electromagnetic reversing valve, and the electromagnetic reversing valve has only two states of minimum opening and maximum opening, the extension of the vertical cylinder is limited. The speed only has two states of zero and maximum speed

In large-scale crane equipment, if it touches the ground at a relatively high speed, it will cause a greater impact on the outriggers, so the outriggers of large-scale crane equipment generally extend slowly to avoid the impact that occurs when they touch the ground, but too slow The outrigger extension speed will affect the working efficiency of the crane

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