Hydraulic system and rotary drilling rig comprising same

Abstract

The invention discloses a hydraulic system and a rotary drilling rig comprising the same. The disclosed hydraulic system comprises a main hydraulic circuit, wherein the main hydraulic circuit comprises a hydraulic pump, a hydraulic actuator and a reversing valve; the reversing valve is connected between the hydraulic pump and a pressure oil cylinder; and a self-locking mechanism is arranged between two hydraulic chambers of the hydraulic actuator. Compared with the prior art, the hydraulic system also comprises a follow-up control valve and a follow-up control overflow valve, wherein the follow-up control valve is connected between an oil inlet of the follow-up control overflow valve and the main hydraulic circuit. In the disclosed hydraulic system, when the oil inlet of the follow-up control overflow valve is communicated with the main hydraulic circuit, the overflow pressure of the follow-up control overflow valve can be reflected on the main hydraulic circuit; and the action speed of the hydraulic actuator is adjusted by influencing the flow quantity of hydraulic oil which is supplied to the hydraulic actuator by the main hydraulic circuit, so that the hydraulic actuator keeps synchronous action with a load part to realize the follow-up of the hydraulic actuator and the load part.

Description

technical field [0001] The present invention relates to a hydraulic control technology, in particular to a hydraulic system, and also to a rotary drilling rig with the hydraulic system. Background technique [0002] Pile machinery is a mechanical equipment used in the construction of various pile foundations, foundation improvement and reinforcement, underground retaining diaphragm walls, underground anti-seepage diaphragm walls, and other special foundation foundations. Its function is to bury various foundation piles into the soil In order to improve the bearing capacity of the foundation. There are two basic types of foundation piles: prefabricated piles and cast-in-situ piles; the former are buried in the soil with piling machinery, and the latter are formed by drilling deep holes with a drilling machine and pouring concrete. [0003] At present, the rotary drilling rig is an important pile-type machine; when performing pile foundation construction, the rotary drilling ...

AI Technical Summary

Problems solved by technology

When the speed at which the power head 150 moves downward is equal to the extension speed of the piston, the pulling force produced by the power head 150 on the piston remains zero; when the speed at which the power head 150 moves downward is greater than the extension speed of the piston, the power head 150 Generate a pulling force on the piston, and this pulling force will force the piston to go down; in actual operation, the pulling force generated by the power head 150 is very large, which will cause the hydraulic oil in the pressurized cylinder 140 to rise, causing the pressurized cylinder 140 or the hydraulic system due to excessive pressure. high and damaged

[0009] The above-mentioned rotary drilling rig in the prior art cannot keep the synchronous action of the piston and the power head 150, and cannot avoid the pulling force of the power head 150 on the piston, so that the above-mentioned rotary drilling rig cannot perform construction operations in accordance with the CFA construction method

Therefore, the above-mentioned rotary drilling rig has the defect that the application mode is single

[0010] The reason for the single application mode of the above-mentioned rotary drilling rig is that the hydraulic power provided by the hydraulic system cannot make the piston of the pressurized cylinder 140 and the power head 150 move synchronously, and, due to the existence of the self-locking mechanism, the pressurized cylinder 140 cannot follow the load. Floating, unable to keep the pressurized cylinder 140 moving with the load parts

In the hydraulic systems with self-locking mechanisms of other construction machinery, there is also the problem that the hydraulic actuators cannot follow the load parts according to the needs of the environment.

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