Device for screwing and unscrewing pipes

 

The invention relates to a drilling technique and can be used on drilling rigs horizontal or vertical drilling for mechanization of Assembly and disassembly of the drill string. The device comprises a power cylinder, a rod which is kinematically connected with the first and second pipes with clamps and two shoulders of the lever. The first pipe has a threaded hole and the second threaded tip with flats on turnkey. The device is equipped with a rotatable sleeve, a shaft and a friction element. A rotary sleeve mounted on the first pipe and the axis on the sleeve. Clamp pivotally connected with the axle and the rod of the power cylinder and has the capability external hard contact with the first pipe. One shoulder duplicator lever, located on the pivoting bearing housing, is connected with the power cylinder. The other shoulder is made in the form of a metal key to open maw and interoperable with the second pipe. The friction element is placed coaxially on the rotary sleeve and halted relative to the housing. To limit rotation of the sleeve body is equipped with emphasis. The device allows you Unscrew the string of pipe using one of the power cylinder, substantially simplifies the design of the drilling machine, tion relates to the drilling technique and can be used on drilling rigs horizontal or vertical drilling for mechanization of Assembly and disassembly of the drill string.

Currently on drilling rigs use different keys for screwing and unscrewing pipes or rods, often using machine key manually.

The most common key for screwing and unscrewing of the drill pipes is the key type battery open maw and equipped with pneumatic or hydraulic locking of the lower pipe and the angular rotation of the upper pipe [1].

However, the key type batteries have a limited ability on the magnitude of the transmission torque during make up and break out pipes of different diameter.

Also known drilling machine, containing a frame or casing, drill pipe with threaded ends and retention mechanisms, and rotating pipes. Each mechanism of the machine consists of two jaw clamps pivotally mounted on the frame and interconnected by means of a hydraulic cylinder, and each strand or decoupling pipe has two jaw gripper [2] . The disadvantage of this drill press is the complexity and bulkiness of the design with a large number of movable joints.

Closest to the present invention is a device for screwing and unscrewing pipes containing si is chaga located on the pivoting bearing housing, with the first pipe has a threaded hole and the second threaded tip with flats on turnkey [3]. This unit is adopted for the prototype.

However, the known device - prototype - is a complex and time-consuming design due to the presence of additional actuators, levers, valves and V-dies, and when changing direction working strokes of the actuators and rotation of the tubes V-die to be rotated 180othat leads to unnecessary expenditure of time.

The objective of the invention is to simplify the design of the device for screwing and unscrewing pipes, as well as reducing the complexity of Assembly and disassembly of the drill columns.

The problem is solved in that the device for screwing and unscrewing pipes containing a power cylinder, a rod which is kinematically connected with the first and second pipes with clamps and two shoulders of the lever, located on the pivoting bearing housing, with the first pipe has a threaded hole and the second threaded tip with flats on turnkey device has a rotatable sleeve, a shaft and a friction element, a rotary sleeve mounted on the first pipe and the axis on the sleeve, the clamp carninoma, one lever arm is connected with the power cylinder and the other is made in the form of a metal key to open maw and interaction with the second pipe, the friction element is placed coaxially on the rotary sleeve and halted relative to the housing, and the latter is provided with a stop to limit rotation of the sleeve.

The invention is illustrated by drawings, where Fig.1 illustrates schematically the side view of the device of Fig.2 is a top view, and Fig.3 - the device depicted in action.

Device for screwing and unscrewing pipes contains the power cylinder 1, the spindle 2 is kinematically connected with the first and second tubes 3, 4 by means of the clamp 5 and two shoulders of the lever 6, located on the pivoting bearing 7 of the housing 8, with the first pipe 3 has a threaded hole 9, and the second 4 - threaded tip 10 disk 11 under the key. The device is equipped with a rotary sleeve 12, the axis 13 and the friction element 14, the rotary sleeve 12 mounted on the first pipe 3 and the axis 13 in the sleeve 12, the clamp 5 is pivotally connected with the axle 13 and the shaft 2 of the power cylinder 1 and has the capability external hard contact with the first pipe 3, one shoulder, two shoulders 15 of the lever 6 is connected with the power cylinder 1, and the other is made in the form of metal the SNO rotary sleeve 12 and halted relative to the housing 8, and the latter is provided with a stop 18 to limit rotation of the sleeve 12.

The operation of the device is as follows. Before working in a drill press install two pipes. One pipe 3 with the screw hole 9 is placed in the rotary sleeve 12, the other pipe 4 with the screw tip 10 mounted in guides (not shown) of the housing 8 serves the pressure in the cylinder 1, with the rod 2 and the clamp 5 is fixed pipe 3 for fixing the sleeve 12, the pipe 4 is clamped in the Chuck of a machine spindle (not shown), the operator includes the machine and is screwing pipes 3 and 4, as well as their feed carriage of the machine (not shown) along the longitudinal axis of the tubing, reducing the effort of fixing pipes in the sleeve 12. The stop 18 limits the rotation of the sleeve 12. Continue to serve the next pipe, repeating the described process and forming the string of pipe. When unscrewing pipes combine the flats 11 (i.e., a nut) with the mouth 17 of the key 6, which when the supply pressure for the piston of the cylinder 1 is rotated about a point And counter-clockwise, is the fixation of the key 6 of the pipe 4. The commit process is improved due to the fact that the friction element 14 retarding the rotation of the sleeve 12 relative to the housing 8. After fixing key 6 rotation Colo the aqueous provisions (see Fig.3). Around the longitudinal axis of the pipe 3 occurs in torque, the clamp 5 is fixed on the pipe 3, creating its rotation relative to the tube 4 by the anglethat leads to break the connection. The necessary force on the rod is selected by the operator of the machine. When the untwisting pipe string when the machine spindle is the moment that is created on the pipe 3 by the clamp 5 and the shaft 2 of the cylinder 1. This total time can create the necessary time unwinding of the tube that defines the essence of the invention. After reducing the pressure behind the piston part of the cylinder 1 connection key - nut breaks down tube 4 is removed from the lathe, and the column pipe by means of the carriage (not shown) is moved closer to the Chuck of the machine, and the process of promotion pipes continues.

Thus, the proposed device allows you Unscrew the string of pipe using one of the power cylinder, substantially simplifies the design of the drilling machine, which reduces its cost and operational costs while drilling.

Sources of information 1. Drill key automatic stationary battery-3M2. THE 26-02028-79.

2. International PCT application WO 83/03443, 1983.

3. USSR author's certificate 1129323, 1984.

 

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SUBSTANCE: wrench includes housing with profiled inner surface serving as cam to be engaged with rollers. Axles of rollers are coupled with clamping members having fixing inserts. Housing is mounted on base by means of sliding bearing assembly. Base has end protrusion with grooves in which clamping members closed by means of restricting cover plates are mounted. Clamping members are arranged one opposite to other and they are mutually joined through two guides in the form of rods of round cross section. Return springs rested upon ends of clamping members are mounted on guides. Housing has cylindrical portion engaged with braking device. Base is joined with drive shaft of reduction gear and it limits axial motion of housing.

EFFECT: simplified design of wrench.

9 cl, 3 dwg

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