SU1017459A1 - Apparatus for preweld assembling of tubes - Google Patents

Abstract

A PIPE ASSEMBLY DEVICE, comprising a housing, an elastic hollow e-mail and clamp bshimakk installed in the housing with the possibility of moving and contacting with an elastic hollow element, characterized in that, in order to improve the quality of the welded connection of pipes of various sizes due to the accuracy of centering, the device is equipped with interchangeable inserts made in the form of a ring with a cross section in the form of a brand and fixed on the case with installed in them with the possibility of movement and contact with clamping, Mi bashmakami additional clamping shoes. (L CZ - f «i.f

Description

The invention relates to the welding of pipelines, in particular to devices for assembling pipes for welding, mainly from thermoplastics, and can be applied in the construction of process pipelines.

A device for assembling plastic pipes for welding includes a fixed and movable clamp-clamps, the latter of which is mounted for movement along the axis of the guide, each of the clamps provided with interchangeable liners with rubber gaskets 11.

This device does not allow to move the torques of the connected pipes relative to each other in the plane of the junction because of their location in rigid centralizers placed on common guides, which does not ensure accurate centering of the pipes.

Closest to the invention is a device for assembling pipes for welding, comprising a housing, an elastic hollow element, and clamping shoulder-pieces mounted in the housing so as to be capable of moving and contacting with a hollow element 23.

The known device does not provide accurate centering of pipes in connection with the possibility of non-simultaneous movement of clamping bashmak in the form of segment blocks, experiencing different resistance to movement, which occurs as a result of uneven distribution of the weight of the centered pipes on the segment blocks, the location of segment blocks (upper and lower), manufacturing inaccuracy etc., especially when changing over to other pipe sizes.

The aim of the invention is to improve the quality of the welded joints of pipes of various T1 sizes by increasing the accuracy of the centering of pipes.

The goal is achieved by the fact that the device for assembling pipes for welding, comprising a housing, an elastic hollow element and clamping shoes mounted in the housing so that it can be moved and in contact with an elastic hollow element, is provided with interchangeable inserts made in the form of a ring with a cross section in the shape of a brand and fixed on the case with installed in. they are movable and in contact with clamping pads with additional clamping pads.

FIG. 1 shows the device} in FIG. 2 shows section A-A in FIG. one; in fig. 3 section bb in fig. 2; in fig. 4 — node I in FIG. 2; in fig. 5 is a diagram of the centering of pipes with the maximum outer diameter of a given standard size; in FIG.%, the scheme was centered of pipes with a minimal external diameter of this type in FIG. 7 - centering scheme

pipes with an intermediate outer diameter lying between the maximum and minimum diameters of this standard size.

The device contains detachable centralizers - fixed 1 and movable 2, mounted for movement along the axis of two guides 3 mounted on a welded frame 4.. Each of the centralizers 1 and 2 consists of a hollow body 5, made of two halves. In the holes made on the inner wall 6 of the hub 5 of each centralizer, there are movably mounted clamping shoes 7, provided with restrictive stops 8, while the gap formed between the stop 8 of the clamping shoes 7 and the inner wall 6 of the housing 5 is equal to half the tolerance on the outer diameter centered pipe. In the cavity of both body sections 5, elastic hollow elements in the form of rubber tubes 9 (elastic elements), when filled with liquid, the clamping shoes 7 are pressed against the outer surface of each centered pipe.

The inner diameter of the housing 5 is made according to the maximum outer diameter of the pipe of this size.

H

Replaceable insertsEpi 10 and 11 are designed for installation into. these pipes of other sizes. Each insert 10 and 11 is made in the form of a T-ring and is equipped with movably mounted clamping shoes 12 with a limiting stop 13. The insert 10 is attached to the body 5 by means of springs (not shown), and the insert 11 to the insert 1О, while the shoes 12

The bushings are in contact with the clamping shoes 7 of the housing 5 and the shoes 12 of the insert 11, and the gap formed between the stop 13 and the wall 14 of the corresponding liner 10 or 11,

equal to half the tolerance ff on the outer diameter of the centered pipe of this size. In addition, the inner diameter of the G-A and D, respectively, of the liners 10 and 11 are made according to the maximum pipe diameter of a given size. An eczeitric clamp 15 serves to secure the halves of the housing 5. The devices operate as follows. depending on the size of the pipes, their ends are installed in 1 to 2 centralizers with or without 10 and 11 inserts. It is known that the outer diameter of the pipes of the same size, varies from the nominal diameter within the tolerance, therefore the outer diameter of the pipes may be the maximum minimum or be within the maximum and minimum diameters. - When centering pipes with the maximum diameter of a given standard size (Fig. 5), they are installed in the centralizers 1 and 2, and using the eccentric clamp 15, fix the halves of the body 5, while centering precisely, since the internal diameter B of the body 5 is equal to the maximum outer diameter of the pipe. In this case, the shoes 7 produce a pipe clamp. The movement of the shoes 7 and the transfer of the clamping forces to them is carried out from an elastic hollow element 9 (rubber tube) into which fluid is supplied under pressure. Centering and clamping pipes of other sizes with maximum diameters are performed using interchangeable inserts 1О and 11 ,, internal diameters D, D of which are equal to the maximum diameters of the centering coarse. At this, the shoes 12 and 10 and 11 are transferred from the shoes 7 .. Disconnected pipes with a diameter (Fig. 6) when installed in centralizers 1 and 2 are centered in the following way. When the rubber tube 9 is filled with LIQUID, the clamping shoes 7 begin to move, while their non-simultaneous movement is possible, i.e. those shoes that have less resistance go before, clamping shoes 7 move up to 1 594. until the stop 8 reaches the walls m 6 of the housing 5. With increasing pressure in the cavity of the tube 9, the other shoes 7 begin to move like the previous one, centering pipes to centralizers 1 and 2 and beyond: x || im; ";; v" Centering and clamping pipes with minimum diameters M and are made using replaceable liners и and 11. At the same time, the device operates in the same way as devices n When centering a pipe with a minimum outer diameter without liners. The difference is that the centering and clamping are carried out by the shoes 12, since the size of the gaps between the stops 13 and the walls 14, is equal to half the tolerance for the outer diameter of the pipe, decreases with decreasing size of the centered pipes (the tolerance for the outer diameter of the pipe decreases with decreasing pipe diameter). When centering pipes with intermediate diameters (Fig. 7), the dimensions of which are enclosed between the maximum and minimum diameter of the pipe. the device operation process would be the same as the device operation process when centering pipes with maximum and min {crazy diameters of this size. The accuracy of the centering is in the range from 0 to 0/4. The proposed device improves the accuracy of the centering of the connected pipes in comparison with the prototype, thereby improving the quality of the welded joint. When centering pipes with maximum and minimum outer diameters in the proposed centralizer, absolute centering accuracy is achieved. When centering pipes with outer diameters ranging from the maximum to the minimum outer diameter, the centering accuracy ranges from 0 to V / 4, where sG is the tolerance for the outer diameter of the standard size.

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Claims (1)

DEVICE FOR ASSEMBLING UNDER PIPE WELDING, comprising a housing, an elastic hollow element and clamping shoes installed in the housing with the ability to move and contact with an elastic hollow element, characterized in that, in order to improve the quality of the welded connection of pipes of various sizes by increasing the centering accuracy , the device is equipped with interchangeable inserts made in the form of a ring with a section in the form of a brand and mounted on the housing with installed in them with the possibility - moving and contacting with clamping · shoes with additional clamping shoes. ? "1L S-U ..., 1017459