A construction machine and its vertical oil cylinder

Abstract

The invention discloses engineering machinery and a vertical oil cylinder of the engineering machinery. A piston rod of the vertical oil cylinder comprises a threaded rod with external screw threads, wherein a screw nut is connected outside the threaded rod in a matched way, and the screw nut and a cylinder tube are in parallel arrangement so that when the screw nut is tightly screwed from bottom to top to be pasted with the bottom end surface of the cylinder tube, and the threaded rod is tightly locked with the screw nut. According to the vertical oil cylinder in the structure, on the basis of the locking function of a hydraulic two-way lock, the threaded connection formed by the screw nut and the threaded rod further realizes the mechanical locking effect. Compared with the prior art, the vertical oil cylinder has the advantages that when the piston rod of the vertical oil cylinder generates the upward contraction trend due to the failure or oil liquid compression rebound phenomenon of the hydraulic two-way lock, the pretightening force generated by the threaded connection becomes the upward contraction resistance of the piston rod so that the vertical oil cylinder still maintains the locking state, further, the vertical oil cylinder always maintains the vertical state with a vehicle frame so that the phenomena of inclination and the like of boreholes drilled by a drilling machine are avoided, and the work reliability of an oil field drilling machine is greatly enhanced.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to an engineering machinery and a vertical oil cylinder thereof. Background technique [0002] Drilling rig is a commonly used construction machinery, such as figure 1 As shown, this figure is a structural schematic diagram of a drilling rig in the prior art. This drilling rig includes a vehicle frame 400, a tire 200 is connected to the bottom of the vehicle frame 400, and the vehicle frame 400 is connected with a movable leg 300 that can rotate horizontally. A vertical oil cylinder 100 is provided at the end, and a drill pipe 500 is connected to the vehicle frame 400 through a luffing oil cylinder 700 . [0003] When driving, such as figure 1 As shown, the tire 200 of the drilling rig is supported on the ground, and the drill rod 500 is placed horizontally on the vehicle frame 400. At this time, the vertical oil cylinder 100 is in a contracted state; figure 2 As s...

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Problems solved by technology

[0008] It can be seen that after the piston rod 2 of the above-mentioned vertical oil cylinder 100 is extended downwards, it is locked by the hydraulic two-way lock 600, so that the length of the vertical oil cylinder 100 can be kept constant. Occasionally, the hydraulic two-way lock 600 fails or the oil compresses and rebounds, causing the piston rod 2 of the vertical cylinder 100 to shrink upwards, which in turn causes the vehicle frame 400 and the drill pipe to no longer be vertical, and finally causes the wellbore to tilt

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