Mechanical Chuck Design and Slip Strength Analysis

F.-N. Shi,Zhi Liu,D. Dobrota,G. Korotcenkov,Y.-L. Lin,R. Dastjerdi,J.-S. Li

doi:10.1051/e3sconf/202129901014

F.-N. Shi, Zhi Liu + Show 5 more

Open Access

https://doi.org/10.1051/e3sconf/202129901014

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Abstract

Chuck is one of the key parts of coal mine tunnel drill, its performance directly affects the performance of the machine. In view of the existing problems of the hydraulic chuck, the structure of the new hydraulic chuck is designed and its working principle is briefly described. The strength of slips is analyzed by finite element method. The calculation results show that the initial design of slips meets the requirements of tunnel drilling rigs.

Highlights

The hydraulic chuck is the key component of the drill in coal mine tunnel
The drilling rig's lifting, drilling and twisting and unloading of drill pipe must be completed by the powerful clamping of the drill pipe by the hydraulic chuck
The working environment of coal mine is bad, mud water and coal powder carried by the outer wall of drill pipe may enter into the chuck, increasing the damage probability of chuck

Summary

Introduction

The hydraulic chuck is the key component of the drill in coal mine tunnel. The drilling rig's lifting, drilling and twisting and unloading of drill pipe must be completed by the powerful clamping of the drill pipe by the hydraulic chuck. The working principle of the normally closed hydraulic chuck is the disc spring clamping and hydraulic loosening. The working principle of the normally open hydraulic chuck is the loosening of the hydraulic clamping spring, which is usually called the capsule hydraulic chuck. Closed hydraulic chucks adopt inclined plane force transmission structure, three slips are arranged inside, and the T shaped inclined groove of the slip seat drives the slips to do radial movement to clamp or loosen the drill pipe. There are three T-shaped beveled grooves in uniform distribution design of slip base, which is difficult to manufacture[2].The capsule type hydraulic chuck has the advantages of large clamping force, rapid response and small inertia, which is widely used in coal mine tunnel drill. In view of the above situation, a new type of mechanical chuck is designed by selecting the advantages of two types of hydraulic chuck

Scheme design

Maximum working load of chuck

Thrust required for clamping drill pipe

Slip strength analysis

Establish finite element model and divide mesh

Apply constraints and loads

Conclusions