SU927956A1 - Gripping device - Google Patents

Description

I

The invention relates to equipment for drilling wells and is designed to capture drill pipes when performing lifting and lifting operations.

A clamping device is known which contains a wedge that is hingedly suspended from the traverse associated with the actuator tl. .

The disadvantage of such a device is that to pass through a rotor with wedges of bits of different diameters, replaceable cylinders are inserted into the rotor bore.

It is also known a clamping device including dies mounted for horizontal movement in the housing, a mechanism for moving the dies in the form of a spring, an actuator, and a clamping ring 12.

The disadvantage of the device lies in the fact that the springs do not provide reliable dilution of the dies, since the ingress of the mud

In the gap between the die and the housing, there is a significant increase in dilution force exceeding the force of the release spring. In addition, the installation of the housing on the springs (to ensure reliable clamping) leads to the fact that the Talev system, on which the drill string is suspended, during splitting loads additionally with a wedging force equal to approximately the weight of the drill string, i.e. the calculation of the pulley system and the mast must be conducted on a double load-carrying capacity (except for the necessary stock).

The aim of the invention is to improve the reliability of the clamping device by eliminating additional wedging efforts.

Claims (2)

This goal is achieved by the fact that the mechanism for moving the dies is made in the form of a rocker arm, which is connected with the die, and a cam mounted on the clamping ring, the axis of rotation of the rocker arm is located outside the die, and the cam and the rocker arm are interoperable. The drawing is a diagram of the proposed clamping device. The proposed clamping device consists of a housing 1 with dies 2, a clamping ring 3 with wedge grooves moved by hydraulic cylinders C through an elastic element (spring) 5 and rocker arms 6 connecting the die to the clamping ring through the cam 7I. The working fluid in the hydraulic cylinders allows movement of the clamping ring 3. The clamping ring 3 pushes the cam 7 rocker 6 with the cam 6. The yoke 6, turning, brings the dies 2 to the pipe. Upon further movement of the clamping ring 3, the dies 2 are wedged onto the pipe with a wedge surface, the elastic element 5 between the ring 3 and the hydraulic cylinder 4 is compressed, provided when the supply of working fluid to the hydraulic cylinder L is disconnected, the required force of the clamping ring 3 is released. the working fluid is supplied to the other cavity of the hydraulic cylinder 4. The clamping ring 3 moves in the other direction, wedges the plates 2 and, when it falls below the plates 2, its end is pressed against the end of the rocker arms 6 spreads dies 2. Claim device Clamping device including dies mounted for horizontal movement in a housing, a mechanism for moving dies, a tool and a clamping ring, characterized in that, in order to increase the reliability of the device by eliminating additional propping forces, the mechanism for moving dies is made in the form of a rocker arm connected pivotally to the die, and a cam mounted on the clamping ring, the axis of rotation of the rocker arm is located outside the die, and the cam and the rocker arm are set enes vozmozhnoetyu reacting with each other. Sources of information taken into account in the examination 1, USSR Copyright Certificate W 108839, cl. E 21 19/07, 1957. 2. USSR author's certificate N 23637, cl. E 21 V 19/00, 19b1 (prototype).