Longitudinal beam oil cylinder support for rotary drilling rig

Abstract

The invention relates to a longitudinal beam oil cylinder support for a rotary drilling rig. The maximum width of a caterpillar track is regulated by changing the travel of an oil cylinder in caterpillar track width adjustable chassis structures of various large and medium-sized rotary drilling rigs. The support comprises parts such as an H-shaped main frame, a pin shaft, fixed lug plates and a longitudinal beam. When the support is arranged, a bracket is welded to a bottom plate of a rectangular box body of the longitudinal beam, one end of the oil cylinder is hinged with the H-shaped main frame, the rectangular box body of the longitudinal beam is arranged at one end of the H-shaped main frame, and a piston rod of the oil cylinder is properly extended outwards; a support lug of the piston rod is arranged on the middle part of the bracket, round holes of the support lug and the middle part of the bracket are kept concentric, the pin shaft is inserted into holes of the bracket and the support lug of the piston rod from a round hole in one side of the rectangular box body of the longitudinal beam, and then the parts such as the fixed lug plates and a bolt are arranged; and the piston rod of the oil cylinder is retracted to the shortest dimension. The upper ends of the lug plates on the two sides of the bracket are semicircular, so that the overall structure is rationally stressed; and the lower end faces of the lug plates are welded with the bottom plate of the rectangular box body of the longitudinal beam to form a whole, so that bearing capability is high, and working reliability is ensured.

Description

technical field [0001] The invention relates to a chassis of a crawler type rotary drilling rig, a structure in which the span of the crawler track can be changed by changing the stroke of an oil cylinder, and is especially suitable for the chassis of engineering machinery with an H-shaped frame structure. Background technique [0002] At present, in order to ensure the stability of the whole machine during the operation of the rotary drilling rig, most crawler-type rotary drilling rigs adopt a structure with adjustable lateral span of the crawler. When the equipment is in the transportation state, the outer width of the left and right crawlers is retracted to the minimum size. To enter the construction state, the crawlers must be fully extended to ensure that the lateral width reaches the maximum. The change of track span is achieved by pushing the bracket installed on the longitudinal beam through the hydraulic cylinder. This structure has been widely adopted by various dr...

AI Technical Summary

Problems solved by technology

In the long-term use process, its threaded connection structure is very prone to loosening. If it cannot be maintained in time, the thread will be damaged soon, resulting in the failure of its structure; between the oil cylinder and the bracket, some end Threaded pin shaft connection structure, these components are installed inside the H-shaped frame with a small space, which brings great inconvenience whether it is daily inspection or maintenance, and the thread damage of this structure often occurs

In addition, the ear plates on both sides of the bracket adopt U-shaped opening structure. The two ends of the connecting pin shaft between the oil cylinder and the bracket are positioned by a long circular plate with a blind hole at one end. The bracket is only one side of the U-shaped opening in the working process. Stress, prone to instability and cause structural failure

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