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Piston type hydraulic chuck

A hydraulic chuck and piston type technology, which is applied to drilling equipment, earthwork drilling, drill pipes, etc., can solve the problems of shortening the service life of key parts of rubber sleeves, long time for damaged parts, and inability to replace rubber sleeves, etc., so as to save The maintenance time, the overall structure is simple, and the effect of avoiding frequent damage

Inactive Publication Date: 2015-05-06
CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the object of the present invention is to provide a piston-type hydraulic chuck, the purpose is to solve the following problems in the rubber sleeve type normally open hydraulic chuck: 1. The problem of frequent damage to the rubber sleeve; 2. Cinder enters the rubber sleeve The moving mating surface with the slips shortens the service life of key parts such as rubber sleeves and slips; 3. It takes too long to replace the damaged parts of the rubber sleeve; 4. If the rubber sleeve is damaged, the chuck immediately fails completely, resulting in the inability to replace the rubber sleeve

Method used

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Embodiment Construction

[0023] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.

[0024] As shown in the figure, a piston-type hydraulic chuck includes a front end cover 211, a rear end cover 24, and a housing 25 arranged between the front and rear end covers. A cylinder 29 is arranged in the housing, and the cylinder The body is provided with elastic slips for clamping the drill pipe. The cylinder body is also provided with a plurality of pistons 28 that slide radially toward the center of the chuck and are used to squeeze the elastic slips. The cylinder body and the housing A high-pressure oil chamber M that facilitates hydraulic oil to push the piston to move is also arranged between them.

[0025] In this embodiment, the elastic slips include a...

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Abstract

The invention discloses a piston type hydraulic chuck which comprises a front end cover, a rear end cover and a shell, wherein the shell is arranged between the front end cover and the rear end cover, a cylinder body is arranged in the shell, an elastic slip stone which is used for clamping a drill rod is arranged in the cylinder body, a plurality of pistons which radially slide to the center of the chuck and are used for extruding the elastic slip stone are arranged on the cylinder body, and a high-pressure oil cavity which is convenient for hydraulic oil to push the pistons to move is formed between the cylinder body and the shell. According to the piston type hydraulic chuck, a principle that a gum cover extrusion slip stone is adopted to clamp in a traditional normally-open type hydraulic chuck is abandoned, the slip stone is pushed to clamp by the pistons, the service life of the pistons as metal parts is obviously longer than that of a rubber gum cover, and therefore, the problem of frequent damage to the gum cover is avoided.

Description

technical field [0001] The invention belongs to the field of drilling rig chucks, in particular to a piston-type hydraulic chuck. Background technique [0002] The chuck is an important part of the drilling rig. Its function is to clamp the drill pipe, transmit torque and axial force to the drill pipe, and drive the drill tool to achieve rotation and drilling. [0003] The chucks of traditional coal mining rigs have the following three structures: normally open chucks, normally closed chucks, and hydraulic elastic chucks. Among them, normally open chucks are currently the most widely used, and the other two are less used. [0004] The normally open hydraulic chuck uses hydraulic pressure to clamp the drill pipe, the spring releases the slips, and the chuck is in a loose state when it is not working. The normally open hydraulic chuck on the domestic drilling rig is a rubber sleeve hydraulic chuck. figure 1 , in the figure, 1 is the oil distribution sleeve; 2 is the end cover...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B19/10
CPCE21B19/10
Inventor 辛德忠陶勇万军张始斋陈航刘小华吕晋军蒲剑杨仁强陈林何函刘旭宋玉壁李光
Owner CHINA COAL TECH & ENG GRP CHONGQING RES INST CO LTD
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