A fast and automatic leveling hydraulic control circuit and control method for down-the-hole drilling rig

Abstract

The invention discloses an automatic quick leveling hydraulic control circuit of a down-the-hole drill and a control method of the automatic quick leveling hydraulic control circuit. The automatic quick leveling hydraulic control circuit comprises support oil cylinders, support balance valves, a magnetic exchange valve bank, a hydraulic control proportional directional valve, a load sensing variable displacement pump and a hydraulic oil tank. Magnetic exchange valves corresponding to the support oil cylinders in quantity are arranged in the magnetic exchange valve bank. Rod cavities and rodless cavities of the support oil cylinders are connected with oil ports of the magnetic exchange valves through the support balance valves. Oil inlets and oil outlets of the magnetic exchange valves are connected in parallel to serve as an oil port P and an oil port T of the magnetic exchange valve bank. An oil port A and an oil port B of the hydraulic control proportional directional valve are communicated with the oil port T and the oil port P of the magnetic exchange valve bank respectively. A pressure relay is communicated with an oil inlet of the magnetic exchange valve bank. A pilot oil pump is connected with a pilot control valve block. A control port of the pilot control valve block is communicated with a pilot cavity b of the hydraulic control proportional directional valve through an electric proportional pressure reducing valve. A pressure feedback port Ls of the load sensing variable displacement pump is communicated with the hydraulic control proportional directional valve. The load sensing variable displacement pump is connected with the hydraulic oil tank. According to the automatic quick leveling hydraulic control circuit of the down-the-hole drill and the control method of the automatic quick leveling hydraulic control circuit, a working platform of the drill can be quickly, accurately and stably leveled, so that operation difficulty is lowered, auxiliary operation time is shortened, and comprehensive drilling efficiency is enhanced.

Description

technical field [0001] The invention relates to the technical field of automatic leveling of drilling machinery, in particular to a quick and automatic leveling hydraulic control circuit of a down-the-hole drilling machine and a control method thereof. Background technique [0002] The down-the-hole drilling rig is widely used in the field of blast hole drilling in open-pit projects such as mining and road construction due to its advantages of large operating aperture and deep drilling. In order to ensure the safe construction operation of the drilling rig, the working face of the drilling rig must be adjusted to a horizontal state before drilling. Therefore, whether it can be quickly, accurately and smoothly leveled has become an important indicator to measure the performance of the drilling rig. [0003] For a long time, the leveling of down-the-hole drilling rigs has been done by the operator visually checking the bubble level in the cab, using a single-point adjustment ...

AI Technical Summary

Problems solved by technology

[0004] 1) The long leveling time increases the auxiliary operation time and reduces the overall drilling efficiency;

[0005] 2) The operator confirms the leveling status by visually checking the bubble level, and the leveling error is large and the accuracy is low;

[0006] 3) Repeatedly move each leg manually, which is difficult to operate and there is a risk of misoperation;

[0007] 4) The operator cannot observe the extension state of each outrigger cylinder (extension stroke and speed) in the cab, and there is a large outrigger impact on the ground instantaneously, which will cause certain damage to the components of the drilling rig

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