CN200998774Y - Special chucking appliance for processing straight-joint sheathed tube - Google Patents

Abstract

The utility model provides a professional chucking appliance for processing direct connection sleeve, which comprises a clamp claw body, a slip is connected on the front end of the clamp claw body, the inside of the slip takes in the shape of inward concave arc curved surface. The slip and the clamp claw body are welded together. The effects of the utility model are that: the structure solves the difficult problem of poor deformation of the direct connection sleeve thread ovality and thin nose; the utility model can control the thread ovality and the thickness of the nose when in use. The slip is welded on the clamp claw of a front chuck, which increases the clamping area when clamping steel tube, force is bear evenly; the deformation of the steel tube caused clamping, and avoids the effect to the turning with ovality existing at the end of the steel tube.

Description

The special mould clamp of processing direct linkage type sleeve pipe

Technical field

The utility model relates to a kind of petroleum casing pipe process equipment, is a kind of special mould clamp of processing the direct linkage type sleeve pipe.

Background technology

The design of direct linkage type sleeve pipe (TP-FJ) is in order to satisfy the needs that recover the oil and dig a well at cavey formation in the oil field.The well of different bores according to different depth, need be got from big to small in general oil field when well-digging, the bore of each well becomes " opening ".Because formation collapse dwindles the bore of the well of getting as far as possible, but the operation below must satisfying.The direct linkage type sleeve pipe is that steel pipe screw thread male end and screw thread female end are directly linked together, see to just look like that a steel pipe is the same from appearance, because of there not being box cupling, the outside dimension of formed whole " bunch tube " has dwindled, the well that needs is opened just little, therefore, just can effectively avoid formation collapse, also reduce the cost of well-digging simultaneously widely.In order to satisfy the oil field requirement, TP-FJ direct linkage type sleeve pipe is specialities of making to measure in the petroleum casing pipe field.In the processing of TP-FJ direct linkage type sleeve pipe, exist the overproof and high problem of nose thickness difficulty of processing of ovality distortion.

Fig. 1 is the original anchor clamps claw that uses, original as shown in the figure chuck jaws 2, because of narrow, the area that contact with steel pipe is less, the stressed area of steel pipe is also less, chucking power is more concentrated, stressed greatly.This product work in-process clamps with the outer surface of steel pipe location, and the measurement of processing after qualified is to be benchmark with the inner surface.Owing to be the direct linkage type sleeve pipe, so in limited wall thickness, need process male end screw thread and female end screw thread, the screw thread that processes is very thin, therefore is easy to distortion.Adding steel pipe in rolling and heat treatment normalizing is handled, existing the situation of the big and wall unevenness of ovality, can not control pipe end distortion and the influence of residual stress well processing.

Summary of the invention

For solving the problem that exists in the above-mentioned technology, the purpose of this utility model provides a kind of processing direct linkage type sleeve pipe special mould clamp, to solve the big and wall unevenness problem of steel pipe self ovality, to the ovality distortion of machining screw and the influence of nose thickness parameter.

For achieving the above object, technical solution of the present utility model provides a kind of processing direct linkage type sleeve pipe special mould clamp, include the jaw base of jig, wherein: the front end in described jaw base is connected with slips, and the inboard of slips is inside recessed arc-shaped curved surface.

Described slips and jaw base are for being welded to connect.

Effect of the present invention is the difficult problem that this structure has solved the overproof and nose thin thickness of extreme line casing thread ovality distortion, uses this special fixture, has stably controlled screw thread ovality and nose thickness.At preceding chuck jaws welding slips, the clamping area when having increased the clamping steel pipe, evenly stressed, avoided clamping the distortion that steel pipe is produced, eliminated the influence that pipe end exists oval meeting that turning is produced.

Description of drawings

Fig. 1 is the jig of prior art;

Fig. 2 is a jig of the present utility model.

Among the figure:

1---jaw base 2---chuck jaws 3---slips

The specific embodiment

Reaching embodiment is in conjunction with the accompanying drawings described in detail structure of the present utility model and process.

Fig. 2 is a processing direct linkage type sleeve pipe special fixture of the present utility model, this processing direct linkage type sleeve pipe isolated plant is made up of two parts, 1 is jaw base, 2 for adding the slips of weldering, front end in described jaw base 1 is connected with slips 3, the inboard of slips 3 is inside recessed arc-shaped curved surface, promptly adds man-hour slips 3 at first to be lathed to the curved surface identical with the steel pipe cylindrical with the contact-making surface of steel pipe, adopts with jaw base 1 to be welded to connect again.Purpose is to increase the area that contacts with steel pipe, the chucking power that steel tube place is born is evenly distributed on the entire contact surface, the distortion of steel pipe has just diminished like this, can be because of the turning of steel tube attenuation yet, and significantly stress release appears in the ovality that pipe end self is existed.

This processing direct linkage type sleeve pipe special fixture is on the basis of original anchor clamps, add the weldering slips, purpose is: increase anchor clamps and the contact area that is held the steel pipe body, pressure when clamping is evenly distributed on each aspect of slips, like this because the dispersion of pressure, the pressure that body self bears diminishes, the elliptic problem that exists of body itself so, and the influence of double thread processing reduces.That is to say that if there is the big problem of ovality in body itself, clamping pressure diminishes, clamping back ovality problem is still existed, body can be not forward and backward in the body clamping greatly because of ovality, and bigger variation takes place geometry.Double thread adds man-hour, and after main axis rotation, the lathe tool cutted thread, anchor clamps unclamp the back body and can not rebound because of self ovality problem.

As shown in Figure 2, when making special fixture, at first will become the curved surface that matches with slips 3 outer surfaces with the lathe tool car with jaw base 1 junction, then the two is welded together, again the special fixture that welds is contained on the lathe, with the arc-shaped curved surface that lathe tool becomes slips inner surface car and the outer surface of steel tube that will process matches.

After the steel pipe location of needs processing male end screw thread and female end screw thread clamps, at inwall elder generation car one cutter of steel pipe, find out the thinnest point of thickness of steel pipe with lathe tool near end face, shimming centering then is beneficial to improve the crudy of screw thread.

Claims (2)

1, a kind of processing direct linkage type sleeve pipe special mould clamp includes the jaw base of jig, and it is characterized in that: the front end in described jaw base (1) is connected with slips (3), and the inboard of slips (3) is inside recessed arc-shaped curved surface.

2, processing direct linkage type sleeve pipe special mould clamp according to claim 1 is characterized in that: described slips (3) and jaw base (1) are for being welded to connect.