RU40378U1 - DEVICE FOR CLAMPING AND ROTATION OF TUBE ELEMENTS - Google Patents

Abstract

The utility model device relates to the field of mechanical engineering, namely to drill keys and can be used in a drilling rig. technique for connecting drill and casing pipes. The device comprises a rotary gear with a connector having a five-sided surface on the inside, in which cassettes containing upper and lower disks with four clamping devices radially placed between them) are made in the form of shuttle mechanisms, consisting of cases and jaws with a carbide die, while the housings are integrated in the guide cassettes, they can radially move when turning the rotary gears. In this case, retractable pins are built into the housing of the clamping device, the protruding ends of which are interfaced with the protrusions of the cups installed between the cassette disks and are provided with a spring, the jaw and the die are connected to the housings by an axis, which, when disconnected, makes it possible to withdraw the housing from the cassette guides.

Description

The utility model device relates to the oil industry, in particular, to technological equipment of rigs equipped with screwdriving-unscrewing keys for threaded joints of drill and casing pipes.

Known designs of pipe-clamping devices in which the jaw-like mechanisms are based on radial movement to the center of the clamping blocks by turning the lever jaws and jamming them on the copy profile surfaces, usually mounted on the device body. Jaws, in these mechanisms are mounted on rotary elements, for example, on rotary drive gears (1, 2, 3, 4, 5 and 6). The disadvantages of these designs are:

- the presence of labor-intensive in the manufacture and assembly of copiers with various profiles of the rolled surfaces;

- restriction of the use of such mechanisms for drill and casing pipes requiring a wide range of gripping diameter;

- the complexity of the design, due to the multi-link leverage of the jaw holders and copiers requiring precision manufacturing of complex profiles and ideal operating conditions;

- low coefficient of reliability and clamping efficiency of pipes due to the presence of a greater number of articulated joints and friction surfaces;

- the need to equip irrationally powerful drives for clamping pipes associated with overcoming friction losses in the joints and the kinematics of the distribution of forces;

- increased complexity of the work on the replacement of parts and assemblies during the transition from one pipe size to another, used in the process of drilling wells.

A known design of the pipe-clamping device for screwing-unscrewing drill and casing pipes, in which the pipe-clamping device is made in the form of a quick-detachable cartridge (7) (the device is taken as a prototype).

The device, containing the upper and lower disks, is equipped with revenge grippers with built-in carbide dies.

The gripping devices are made in the form of separate units containing gear segments with two-arm replaceable levers attached to them, equipped with carbide dies.

The gripping devices are evenly spaced around the circumference and pivotally connected by axes passing through the gear segments, the upper and lower disks of the jaw holders in such a way that the teeth of the graded segments are paired with the gear rims

instrument rotor gears, and dies built into two-arm levers face the axes of the pipes and are placed in two tiers at radial angles defined for each pipe size. The disks of the lower device (locking key) are rigidly fixed to the housing, and the disks of the upper device (pipe rotator) are rigidly fixed with movable friction brake disks, the clamping force of which is determined by a certain moment of resistance. When the drive rotor gears are rotated, the segmented segments rotate relative to their own axes and, together with them, the two-arm levers are rotated and the dies converge to the pipe, clamping the lower pipe and rotating the upper one. Despite the advantage of this design over the above, the prototype also has disadvantages, namely:

- has a more complex design of levers and gear sectors requiring precise manufacturing;

- to ensure when screwing-unscrewing pipes with a wide range of gripping diameters, a large number of interchangeable levers are required;

- convergence of the dies to the pipe is made when the levers are turned relative to the axes of the gear sectors at different angles to the tangents, which limits the radial stroke of the dies

and requires compliance with the accuracy of the kinematics of the installation of the dies in the levers.

These problems stimulated the search for new technical solutions. The proposed device of the utility model is aimed at solving the problems of creating a quick-change interchangeable clamping mechanism of a drill key corresponding to the standard sizes of screwed pipes and at the same time ensuring the reliability of the assembly with increasing loads on the locking pipe connection. This problem is solved by simplifying the kinematics of the force mechanism of pipe clamping. reducing the number of elements involved in power contacts with mating parts and the modular design of the group of jaw holders for the used pipe sizes with the unification of their installation dimensions and seats. For this, a device for clamping pipes, including a pipe rotator and a lock, a key, equipped with drive rotary gears made with connectors, have inner sides, five-sided surfaces with cassettes built into them, containing upper and lower disks, with four clamping devices radially spaced between them made in the form of shuttle mechanisms, consisting of housings with a roller support integrated on one side and jaws attached to the housing with carbide dies on the other hand.

In this case, the roller bearings are interfaced with the surfaces of the pentahedron, and the housing of the clamping devices are built into the guide cassettes, the upper and lower temples of which are made with a connector and have the ability to move separately when turning the rotor gears. At the same time, retractable pins are built into the housing of the clamping device, the protruding ends of which are interfaced with the protrusions of the glasses installed between the cassette disks and equipped with jaw return springs with a die when the rotor gear returns to its original position.

In turn, the jaw with a ram is connected to the housing by an axis, when disconnected, the jaw is removed and the pins can be removed from contact with the cups and the housing can then be pulled out of the guides of the cassette. The technical result when implementing the device of the utility model is expressed in the use in the design of the device of quick-release jaws with dies made of hard alloy and cases with roller bearings while maintaining the position of the cartridges and the device in the cases of the pipe rotator and lock wrench, which makes it possible to quickly replace the dies when they are worn, and the transition to a different standard size for the diameter of the downhole pipes. Information confirming the possibility of implementing the device of the utility model is illustrated by drawings,

Where:

figure 1 presents a General view of the device is a plan view;

figure 2 - section aa in figure 1,

figure 3 is a section bB in figure 2.

A device for clamping and rotating the tubular elements consists of a drive rotary gear 1 equipped with a connector and a device 2, made in the form of a quick-release cassette also having a connector.

The rotor gear 1 is provided with an external gear rim 3, through which the gear 1 is engaged with the drive gear 4 of the drive rotation (rotation).

On the inner side of the rotary gear 1 has a five-sided surface 5.

The device 2 consists of a lower 6 and upper 7 discs between which at equal distances from each other, around the circumference are placed and rigidly fastened to the disks 6 and 7 guides 8.

Disks 6 and 7 are fastened together by ties 9.

In the guides 8, housings 10 are installed, having on one side a fork 11, into which a roller 13 is mounted through the axis 12, and on the other hand, the machined platform 14 is made in the form of a fork, into which the jaw 16 with a hard alloy die 17 is installed through the axis 15.

The rollers 13 are in contact with the planes of the pentahedron 5.

The housing 10 has a transverse cylindrical bore 28 with a pin 19 integrated therein and a longitudinal bore 20 with a pin 21 installed therein. The pin 21 is fastened to the pin 19.

Disks 6 and 7 have four transverse sprouts 22, in which guides 8 are embedded, and longitudinal bores 23 between them.

Guide 8 has a window 24 for passing pin 19 into it.

Four glasses 25 are installed in the longitudinal bores 23, which are equipped with a spring 26 and a protrusion 27.

The disks 6 and 7 are equipped with dowels 28, with the help of which the cassette is rigidly fastened either to the housing near the lock key or to the brake pulley at the pipe rotator.

The mentioned part, lock wrench and brake pulley are not indicated in the drawings.

The jaw 16 with the die 17 have their own size for each pipe.

Housing 10 is used on several pipe sizes.

The device works as follows:

When you turn on the drive rotation 4 (rotation), the rotor gear 1 is rotated, its inner pentahedral planes 5 turning act on the rollers 13, and through them on the housing 10, which move in the radial direction in the guides 8, bring the jaw 16 with the dies 17 to the pipe 29 closing on it with effort. In this case, the protruding ends of the pins 19 act on the protrusions 27 of the glasses 25, move them, compressing the springs 26.

When the drive is turned off and the rotor gears 1 return to their original position, the springs 26 are unladen by moving the housings 10 together with the rollers 13 and dies 17 to their original position, forming a diametrical clearance between the pipe 29 and the dies 17. In the case of switching to another pipe size or replacing the dies 17 the axis 15 is removed from the housing 10, the jaw 16 with the ram 17 is removed from the plug of the housing 10, giving access to the pin 21 and when it is removed to the side, the pin 19 is removed from the window 24 of the guide 8, allowing the housing 10 together with the roller 13 to freely withdraw from n guiding 8 discs 6 and 7.

Installation of the replaced housing 10 with the roller 13, the jaws 16 with the die 17 is in the reverse order.

SOURCES OF INFORMATION:

1. Copyright certificate No. 1355688 A1 MKI E 21 B 19/16, B publ. November 30, 1987 Bull. No. 44.

2. Copyright certificate No. 1585492 A1 MKI E 21 V 19/16 publ. 08/15/90, bull. No. 30.

3. Copyright certificate No. 1668626 A1 MKI E 21 V 19/16 publ. 03/02/91, bull. No. 29.

4. US patent No. 4688453 from 0.01.88 E 21 V "Device for threaded connection of tubular elements".

5. US patent No. 4404826 E 21 In the "pipe gripping device rotation."

6. Hydraulic drill key KBG-2 design VNIINeftemat.

7. Patent No. 2078900 of 05/10/97, E 21 B 19/16 “Tube-clamping device for threaded connection of tubular elements”.

Claims (1)

A device for clamping and rotating pipe elements, mainly drill and casing pipes, containing mutually centered rotator and lock wrench with drive rotary gears integrated in them with removable cassettes installed inside, containing upper and lower disks with clamping devices radially arranged around the circumference, characterized in that the drive rotor gears are made with a connector, have pentagonal surfaces on the inside, with cassettes integrated in them, containing upper and lower disks with four clamping devices radially arranged between them, made in the form of shuttle mechanisms, consisting of housings with roller bearings mounted on one side and jaws attached to the case with carbide dies, while roller bearings are mated to the surfaces of the pentahedron, and the housings built into the guide cassettes have the ability to radially move when the rotor gears are rotated, while retractable pcs are built into the housing of the clamping device ri, the protruding ends of which are associated with the protrusions of the glasses installed between the cassette disks and equipped with jaw return springs with a die, while the jaw with a die is connected to the body by an axis, when disconnected, the jaw is removed with the possibility of removing the pin from contact with the glass with subsequent withdrawal of the case with roller support from cassette rails.