Patent ID: 11920437
Assignee: SINOPEC PETROLEUM ENGINEERING TECHNOLOGY RESEARCH INSTITUTE CO., LTD.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 12:
13. The speed-enhancing drilling tool according to claim 12, wherein an accommodating groove is formed on an outer side wall of the second rotating segment, and a limiting block protruding radially outward relative to the outer side wall of the second rotating segment is arranged in the accommodating groove,
the percussive device further includes an outer shell, at least a part of which surrounds the second rotating segment, so that the limiting block is sandwiched between the second rotating segment and the outer shell,
a wear-resistant joint is connected to a lower end of the outer shell, and has an upper end inserted into the lower end of the outer shell, wherein an upper end face of the wear-resistant joint is opposite to the limiting block, for restricting axial movement range of the limiting block,
wherein the limiting block includes a first matching segment and a second matching segment located below and connected with the first matching segment, an outer diameter of the first matching segment being smaller than that of the second matching segment, wherein an outer side wall of the second matching segment is in engagement with an inner wall of the outer shell, while a separating space is formed between the first matching segment and the outer shell, and
a mounting sleeve is provided between the outer shell and the second rotating segment in an area above the limiting block, the mounting sleeve extending into the separating space to maintain a radial position of the limiting block.