Anti-drop mechanism

Abstract

The invention discloses an anti-drop mechanism and belongs to the technical field of petroleum drilling equipment. The anti-drop mechanism comprises a check block and further comprises a lock-up block. The lock-up block is connected with the check block in a lock-up mode. The lock-up block comprises a lock hook part and a force bearing part. The check block comprises a lock-up part and an anti-drop part. The lock-up part is located in a lifting lug upper notch. The anti-drop part is located in a lifting lug hole. The check block makes pendulum-type movement and swings clockwise to be locked with the lock hook part of the lock-up block, and accordingly the lock hook part is in a pressed state; and the check block swings anticlockwise to be unlocked with the lock-up block, and accordingly the lock hook part is in an uplift state. The check block is connected with the lock-up block in a lock-up mode, so that locking is reliable, and the stability of the check block is greatly guaranteed. Due to the fact that the lock-up block is located in the lifting lug upper notch, the lock-up block is not exposed on the outer side of an elevator, so that wrong touching of the lock-up block can be effectively avoided, safe reliability in the operation process is greatly improved, and the safety accident is avoided.

Description

technical field [0001] The invention relates to the technical field of oil drilling equipment, in particular to an anti-off mechanism. Background technique [0002] In drilling engineering, an elevator is a tool used to lift pipes such as drill pipes, oil pipes and casings. It is hung in the lifting rings on both sides of the hook of the hoisting system, so as to lift out or run in the drilling tool, tubing and casing of the wellbore. [0003] During actual use, due to the influence of various factors such as the environment, the lifting ring is easy to slip out of the ear hole of the elevator, causing a major safety accident. In order to prevent the lifting ring from falling off from the ear hole of the elevator, the elevator is usually equipped with an anti-off device. The anti-off device in the prior art mostly adopts a bolt structure, and a longitudinal bolt hole is set at the lifting ear of the elevator, and the bolt is inserted into the bolt hole. It can prevent the ...

AI Technical Summary

Problems solved by technology

[0007] The elevator anti-off device disclosed in this patent document is relatively convenient for loading and unloading of the lifting ring, but since the cushion block is fixed on the boom of the elevator through the stop pin, the stop block of the lifting ring is connected with the block through the fixing pin, and the anti-off The device works frequently, and the stop pin also has wear problems after long-term use. The stop pin is easy to slip off, resulting in the failure of the anti-off device and poor working stability; moreover, the entire anti-off device is located outside the ear hole of the lifting lug. At this time, due to the surrounding environmental factors, the stopper is prone to false triggering, the stopper is opened abnormally, and the lifting ring slips off, causing a safety accident.

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