RU2691150C1 - Puller - Google Patents

Abstract

FIELD: machine building.SUBSTANCE: invention relates to pullers for extraction of hollow part with broken thread part. Puller comprises bushing made coaxially with cylindrical recess and provided with engagement elements, and tie rod having, at one end, outer thread with nut, and on other end - conical section located opposite cylindrical sample of bushing. Engagement elements are made with possibility of contact with conical section. Tie-rod is made with possibility of axial movement inside bushing. Bushing is made with a smooth outer side wall and with four longitudinal slots made from the end of the sleeve facing the conical section of the rod, and engagement elements are made in form of dies for engagement with inner wall of extracted part, which are installed in longitudinal slots with possibility of longitudinal and radial movement. On the outer wall of the slots there is a transverse groove, wherein in the longitudinal slots a rubber ring is installed, which presses the dies to the tie-rod, and a check-nut is screwed onto the threaded end of the tie-rod.EFFECT: technical result consists in expansion of technical capabilities of puller.1 cl, 3 dwg

Description

The invention relates to oil-field equipment, in particular to a hand tool, and can be used in the repair of equipment of oil and gas wells to extract the broken threaded part of the pipe from the faceplate.

Known puller for extracting threaded elements (Patent SU 1184661, IPC W25B 27/067, publ. 10/15/1985. Bull. No. 38), containing a rod with a threaded hole at the end and mounted on it to move the load, while the rod is made with a through longitudinal groove and an additional threaded hole at the free end, and the puller is provided with a lock position of the load in the groove. Known puller allows you to remove only the threaded non-hollow elements with external threads, such as bolt and stud.

A puller is also known (A.Reference. SU 1269987 B25B 27/00. Publ. 11/15/1986) containing a coaxial-mounted sleeve made in the form of a collet, on the petals of which the teeth are located, and a pull provided with a conical tip. Traction has the possibility of axial movement within the collet. The collet with the inner surface of the petals interacts with the conical tip. In such a design, the capture of a recoverable part is carried out by inserting the teeth of the collet lobes into it, and when the parts are removed by rotating the collet, the petals may be destroyed.

The closest to the proposed is a puller (Patent RU 99740. IPC В25В 27/00, publ. 27.11.2010), Bull. No. 33), containing a sleeve made with coaxially arranged cylindrical sample, and equipped with engagement elements, and a thrust having an external thread with a nut at one end, and a conical section at the other end opposite the cylindrical sampling of the sleeve, while the engagement elements are made with the possibility of contact with the conical section, and the thrust - with the possibility of axial movement inside the sleeve. The disadvantage of the prototype is that it does not provide extraction of the hollow element with an external thread from the threaded sample, since the engagement elements are made in it in the form of strikers. The heads are mounted on the sleeve radially and have a small area of contact with the wall of the extracted element (part). When turning the puller, the strikers slide along the wall of the extracted element. When the strikers are strongly pressed against the wall, they deform the wall and thread of this element, preventing the extraction of a hollow element with an external thread.

An object of the invention is the expansion of technical capabilities.

The task is solved by the fact that a puller for extracting a hollow part with a broken threaded part containing a sleeve made with coaxially arranged cylindrical sampling and equipped with engagement elements and a thrust having an external thread with a nut at one end, and a conical one at the other end the area located opposite the cylindrical selection of the sleeve, with the elements of the engagement made with the possibility of contact with the conical section, and the thrust is made with the possibility of axial movement inside the sleeve, different those that the sleeve is made with a smooth outer side wall and four longitudinal grooves made from the end of the sleeve facing the conical section of the tyat, and the engagement elements are made in the form of dies for coupling with the inner wall of the extracted part, which are installed in the longitudinal grooves with the possibility of longitudinal and radial movement, with a transverse groove made on the outer wall of the dies. and in the longitudinal grooves there is a rubber ring that presses the dies to the thrust, and a lock nut is wrapped on the threaded end of the thrust.

FIG. 1 shows the proposed puller for extracting a hollow part with a broken threaded part in section; in fig. 2 - section A-A of FIG. one; in fig. 3 - view of the puller, explaining the principle of its work.

The puller for extracting a hollow part with a broken threaded part contains sleeve 1. made with coaxially arranged cylindrical sample 2, and equipped with engagement elements 3. Also the puller for extracting a hollow part with broken thread part contains a thrust 4 having an external thread 5 with a nut at one end 6, and on the other side of the pile there is a conical section 7 located opposite the cylindrical sample 2 of the sleeve 1. In this case, the engagement elements 3 are adapted to contact the conical section 7, and the thrust 4 is axially p Displacement inside sleeve 1. Sleeve 1 is made with a smooth outer side wall 8 to reduce manufacturing costs, and with four longitudinal grooves 9. These grooves 9 are made from the end 10 of sleeve 1 facing the conical section 7 of the thrust 4. The engagement elements 3 are made in the form of dies 11, which are installed in the longitudinal grooves 9 with the possibility of longitudinal and radial movement. This possibility is ensured by the implementation of gaps of a width of 0.1 ... 0.3 mm between adjacent walls of dies 11 and a longitudinal groove 9. A transverse groove 12 is made on the outer wall of dies 11. A rubber ring 13 is installed in these ditches of the dies. 4, and designed to hold the dies 11 in the device. Threaded

the end of the thrust 4 is tightened the lock nut 14 to prevent the nut 6 from loosening after moving the dies away from the thrust 4.

The puller for extracting a hollow part with a broken threaded part works as follows. In the initial position of the device, the dies 11 are recessed in their longitudinal grooves of 9 sleeves 1 and the distance a between the outer walls of the two opposed dies is minimal. In this position, the left part of the puller is introduced into the internal cavity of the extracted part 15. This part may be a broken thread part of the pipe of the faceplate 16 of the oil well. Then, holding the thrust 4 by the flats 17 with a wrench, turning the nut 6 moves the sleeve 1 to the left relative to the thrust 4. The sleeve 1 moves the dies 11 to the left. They interact with the conical section 7 of the thrust 4 and move in the radial direction to the left. The distance b between the outer walls of the two opposed dies 11 increases, and the dies fix the puller inside the removable part 15. Next, tighten the lock nut 14, lock the nut 6 from the turn, and turn the puller counterclockwise with a wrench for this nut 6. In this case, associated with the dies 11, the extracted part 15 is unscrewed and exits the threaded selection of the base part, for example, the faceplate 16.

In the proposed puller for extracting a hollow part with a broken threaded part, the engagement elements are made in the form of dies. They, due to the large area of the outer walls, securely interlock with the inner wall of the extracted part. This makes it possible to remove a hollow part with an external thread from a threaded sample by rotating the puller to remove a hollow part with a broken threaded part. Because of this, the technical capabilities of the proposed puller for extracting a hollow piece with a broken threaded part are expanded.

List of used information: Patent SU 1184661, IPC В25В 27/067, publ. 10.15.1985, Byul. №38

A. svid. SU 1269987 В25В 27/00, publ. 11/15/1986

Patent RU 99740, IPC W25B 27/00, publ.27.11.2010, Byul. No. 33

Claims (1)

A puller for extracting a hollow part with a broken threaded part, comprising a sleeve made with a coaxially arranged cylindrical sample and provided with engagement elements, and a thrust having an external thread with a nut at one end, and a conical section at one end opposite the cylindrical sample of the sleeve, the elements of the engagement are made with the possibility of contact with the conical section, and the thrust is made with the possibility of axial movement inside the sleeve, characterized in that the sleeve is made with a smooth outer th side wall and with four longitudinal grooves made from the end of the sleeve facing the conical section of the thrust, and the engagement elements are made in the form of dies for coupling with the inner wall of the extracted part, which are installed in the longitudinal grooves with the possibility of longitudinal and radial movement, and on the outer the dies wall is made a transverse groove, and in the longitudinal grooves there is a rubber ring that presses the dies to the thrust and a lock nut is wrapped on the threaded end of the thrust.

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