L-shaped self-locking positioning pin for square connection

Abstract

The invention mainly provides an L-shaped self-locking positioning pin for square connection. The L-shaped self-locking positioning pin for square connection is mainly used in connection of square connection drilling rods. For plugging and fixing of the square connection drilling rods, the design of an L-shaped structure is adopted, and a fixing catch pin is installed on one side; after the two square connection drilling rods are matched and connected, an L-shaped positioning pin is inserted and then rotated, and blades are clamped and pop out after the fixing catch pin at the L-shaped tail of the L-shaped positioning pin makes contact with the blades to avoid disengagement; and when the drilling rods are disassembled, the L-shaped positioning pin can be pulled out simply by being rotatedreversely. Through the design of the positioning pin, use is easy and convenient, and the purpose of connecting and fixing the square connection drill rods can be effectively achieved; and besides, disassembling and assembling are easy, convenient and fast, and much convenience is brought to underground drilling construction.

Description

Technical field [0001] The present invention mainly relates to a square connecting L-type self-locking positioning pin, which is mainly used for connecting square connecting drill rods and fixing the square connecting drill rods. Background technique [0002] The square connection type drill pipe is a common type of drill pipe connection used in the use of drill pipes. It has reliable stability. Using square connection as a connection method for drill pipes can effectively transmit and output torque, especially for the rod body. The advantages of drilling tools with spiral blade structure wound on the surface are more prominent. In order to prevent the square connection structure from detaching, the automatic spring pin is usually used to control the separation of the square connection structure, but the automatic spring pin often has insufficient spring pin strength or stress concentration This can cause the elastic pin to break, and even cause the drill pipe to lose the acciden...

AI Technical Summary

Problems solved by technology

[0002] As a common form of drill pipe connection in the use of drill pipes, square connection drill pipes have reliable stability. Using square connections as a connection method for drill pipes can effectively transmit and output torque, especially for the rod body Drilling tools with spiral blade structure wound on the surface have more prominent advantages. In order to prevent the square connection structure from detaching, the detachment of the square connection structure is usually controlled by automatic spring pins, but automatic spring pins often have insufficient spring pin strength or stress concentration. Cause the spring pin to break, and even cause the accident that the drill pipe is lost in the hole; another fixing method is to use the rivet pin structure, and then use the tight spring to fix and lock. This connection structure is convenient and durable, and has good tensile and compressive effects. After using for a period of time, the life of the tight spring decreases, the rigidity weakens, and the locking ability of the rivet pin decreases, which will cause the rivet pin to fall off later, causing a loss accident in the drill pipe hole

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