RU2157299C1 - Apparatus for chamfering tubes at inner side - Google Patents

Abstract

FIELD: oil production industry branch, namely inner-side chamfering of tubes of pumps or compressors, particularly at underground repairing of tubes in field conditions. SUBSTANCE: apparatus includes milling cutter with drive shaft having on its rear portion central handle and rotary lever with ratchet mechanism. Apparatus is provided with chip deflector mounted in front portion of drive shaft. Milling cutter has hollow body with grooves arranged along its circumference designed for changeable cutting triangular tips fixed by means of pressure ring and nut. Drive shaft is placed inside hollow body and it is jointly secured to it by its leading portion. EFFECT: possibility of inner-side chamfering of tubes at any working conditions. 3 dwg

Description

 The invention relates to the oil industry and can be applied, in particular, in underground well repair for removing the internal bevel of tubing (tubing), for example, in the field.

 GOST 633-63 provides for chamfers at the ends of tubing, performed at the same time when cutting tapered threads on special machines. In practice, for example, at the next descent of the tubing string, there are pipes in which there is no internal chamfer, as a rule, after restoration of the ends of the pipes. In addition, due to wear of the thread when turning the pipe under excessive torque, the end is rolled to the inside. The passage narrows, an annular obstacle appears on the path of centralizer scrapers used to prevent paraffin formation in the tubing.

 A device is known for removing the inner bevel of pipes containing a cutter with a drive shaft, on the back of which there is a central handle and a rotary lever with a ratchet mechanism (see US 2688902, B 23 C 3/00, 1954).

 The objective of the invention is to ensure the removal of the inner chamfer of the tubing in production in all cases.

 To solve this problem, a device for removing the inner chamfer of pipes is proposed, which comprises a cutter consisting of a hollow body with grooves located around the circumference for replaceable cutting inserts of a triangular shape, fixed with a pressure ring and nut, and the cutter is equipped with a drive shaft located inside the hollow body and connected to the latter pivotally in its front part, while the rear part of the drive shaft is equipped with a central handle and a rotational lever with a ratchet mechanism, and the front part ST - chip reflector.

 In Fig.1 shows a device for removing the inner chamfer of pipes, in Fig. 2 is a section along the line aa in figure 1, figure 3 is a section along the line bb in figure 1.

 The device includes a milling cutter from the hollow body 1 (Fig. 1) with grooves 2 (Fig. 3) located around the circumference. In the grooves 2, triangular-shaped carbide inserts 3 are installed, the peripheral position of which is determined by a common pressure ring 4, tightened by means of a nut 5 with a lock nut 6 through an elastic element 7 such as a rubber gasket designed to absorb when excessive, abrupt forces occur.

 The cutter is equipped with a drive shaft 8, freely located in the hollow body 1 and connected to it pivotally 9 in its front part, which ensures the self-installation of the cutter relative to the workpiece. In the back of the drive shaft 8 is equipped with a central handle 10 (figure 1), a rotary lever 11 with a ratchet mechanism. The ratchet mechanism consists of a ratchet wheel 12 connected to the drive shaft, a dog 13 with a spring 14 (Fig. 2). In front of the drive shaft 8 is equipped with a chip reflector 15, designed to prevent ingress into the processed pipe 16 formed when removing the chamfer of the pipe.

The device operates as follows. It is necessary to remove the inner chamfer at the nipple end of the tubing lying on the bridges (floor) in the conditions of the well. Taking, for example, with the left hand for the central handle 10, and with the right hand for the rotary lever 11, the cutter of the device is sent to the pipe 16 being processed. The rotary lever 11 of the cutter rotates in the cutting direction at some possible angle (turning 360 ^o - the floor interferes), at the same time pressing the cutter to the end of the pipe 16 with his left hand.

 When the lever 11 is pulled back, the ratchet mechanism is activated, the dog 13 slips the teeth of the ratchet wheel 12. The drive shaft 8 is rotated by the lever 11 for another 1 cycle, etc. The operation is repeated until the end of the housing 1 stops in the pipe 16, i.e. until complete chamfering. After that, the device is removed from the pipe 16, while the chip reflector 15 carries with it the generated chips.

 When processing pipes in stationary conditions, a pneumatic or electric wrench is used.

 The device allows you to remove the inner chamfer of pipes under any production conditions.

Claims (1)

 A device for removing the inner bevel of pipes containing a cutter with a drive shaft, on the back of which there is a central handle and a rotational lever with a ratchet mechanism, characterized in that it is equipped with a chip deflector mounted on the front of the drive shaft, while the cutter has a hollow body with around the circumference with grooves for interchangeable cutting inserts of a triangular shape, fixed with a pressure ring and a nut, and the drive shaft is located inside the hollow body and is articulated to it front end.

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