RU2678552C1 - Device for welding of pipe in fixed position - Google Patents

Abstract

FIELD: welding production.SUBSTANCE: invention relates to the field of welding production and can be used for welding pipes in stationary or in field conditions. Device contains a support-connecting element, made in the form of rigid links, pivotally interconnected with the possibility of covering the pipe around the circumference and moving along it, located on the support-connecting element drive mechanism for moving the specified element around the pipe, and a welding mechanism, supporting rollers are mounted on each of the mentioned links for supporting the outer surface of the pipe, and the hinge link is made with the ability to ensure the rotation of two adjacent links only around the axis of the hinge connection, parallel to the axis of the pipe. Device is also equipped with a tensioning mechanism, and the distance between the extreme outer edges of the supporting surfaces of the coaxial rollers is at least 50 mm.EFFECT: use of the invention allows to reduce the complexity of the work and improve the quality of welding joints while reducing the welding time.4 cl, 4 dwg

Description

Technical field

The invention relates to a device for welding pipes in a factory stationary or in the field and can be used in any conditions constrained for the production of such works.

State of the art

Welding remains by far the most reliable way to connect pipes. During the construction of trunk pipelines, not only the operational reliability of pipelines, but also the terms of construction and installation works, the final cost of structures depends on welding work. Both the overall rate of construction of pipelines and their quality depend on welding work. The quality of construction and installation works directly determines the cost of further operation of highways. Elimination of unproductive time losses during the necessary technological operations is a significant reserve in ensuring the quality of welded joints, and consequently, the operational reliability of pipelines and reducing the time for construction and installation works.

A welding device for butt welding of pipes is known, comprising at least one welding trolley on which at least one welding head is installed, having at least one welding torch, said welding device being installed and able to move along the joint plane between the pipes to be welded with using an orbital holder made with the possibility of translational movement along the formed pipeline and with the possibility of moving and positioning the specified wel LfTetanus device along the joint plane between the welded pipes. The annular segments of the orbital holder are made with the possibility of their sliding along the guides in a plane perpendicular to the axial plane of the connected pipes, and / or turning into a position in which they extend along the pipes. [Patent No. 2441738 RU, IPC B23K 37/053; B23K 37/02. An orbital holder comprising at least two interconnected elements in the form of annular segments; A device for butt welding of pipes for forming a pipeline containing such an orbital holder / Dupont Thierry (FR), etc .; Serimax (FR). - 2008141709/02; Claim 03/28/2007, Publ. 02/10/2012] [1].

The known device has large weight and size characteristics. Therefore, it is not applicable for welding in difficult spatial conditions, for welding in channels and trenches. Reconfiguration to various diameters occurs with the replacement of the orbital holder and requires considerable time.

A device is known for multi-pass welding of fixed pipe joints, including a base, a faceplate with a gear ring and a welding torch, a reversible drive for rotating the faceplate, a control system with a control unit for joining the pass rollers and the layout of the pass joints made in the form of a reducer. The gear housing is mounted on the base. [Patent No. 2049633 RU, IPC B23K 37/053; B23K 9/028; B23K 31/02; Device for multi-pass welding of fixed pipe joints / Gorlov E.I. and etc.; Central Research Institute of Shipbuilding Technology. - Application 5030201/08; Claim 02/04/1992, Publ. 12/10/1995.] [2].

The device can be used for multi-pass welding of joints of thick-walled pipes under any conditions of crowding.

The disadvantages of the known solutions are: a complex mechanical circuit of the device, due to the presence of several gearboxes and drive devices, each diameter of the pipe being welded requires the installation of a face plate with a gear ring of the corresponding diameter. The device has a complex setting for the joint of each diameter, and the parameters of this setting cannot be changed during the welding process.

Information is known about equipment for orbital welding as part of a device for welding a through straight pipe and a bent pipe. The device comprises a fixed support table for pipes, a support table for pipes, rotatable in a horizontal plane around the vertical axis of the pipe located on the support axis. Each table contains a base having rails. A device for orbital welding is also mounted on a table equipped with rails. The ring of the annular welded guide is vertically sliding. Vertical movement of the ring is carried out using an electric motor. The ring contains two parts, pivotally connected and fixed. The upper part of the ring is rotatable to insert the pipe. The welding machine engages with the groove of the annular ring and is driven around the ring by an electric motor acting through gears. The burner and piping guide roller move vertically together. Welding wire is fed to the torch from a drum. [Patent No. 1465959 GB, IPC B23K 37/053; B23K 9/028; B23K 37/00. Pipe welding apparatus_ / MITSUI SHIPBUILDING ENG. - JP19730047906; Claim 04/26/1973. Publ. 04/25/1974.] [3].

The known device for orbital welding of pipes has significant weight and size characteristics, is stationary.

And welding of various pipe diameters requires the corresponding diameter of the guide ring.

The closest is the information about the device for welding pipes, which contains a carriage moving around the pipe at the junction of the pipes, a flexible tension element connected to the carriage with the possibility of passage around the pipe to hold the carriage on the pipe, power means on the carriage to move it and the tension element around the pipe . The device contains a welding head mounted on the carriage for welding the seam when the carriage moves around the pipe [Patent No. 3102187 US. Apparatus for welding pipes / George A. Coscia. - No. 69025; Claim 11/14/1960; Publ. 08/27/1963.] [4].

The device has one welding carriage with a mounted welding torch. Installation of drives on one carriage to move the welding torch around the seam, torch bias drives across the seam and in the radial direction from the pipe, torch tilt drive, electric cables, etc. requires the use of a welding carriage of large dimensions.

A feature of the above device is the rotation of the welding carriage together with a flexible tensioner around the pipe, i.e. There is no guide device fixed stationary on the pipe. Due to minor deformations of the pipe, the cylindrical surface of the pipe, the presence of a longitudinal weld on it, metal spray on the outer surface of the pipe, ovality of the pipe, the welding carriage together with the flexible tension element will inevitably deviate from the weld path, which will lead to the inability to perform a high-quality weld weld and the need for constant correction of the position of the welding torch.

Disclosure of invention

The technical result of the invention is to reduce the complexity of the work, including in cramped conditions, improving the quality of welding joints while reducing welding time.

The technical result is achieved by using for welding work on pipelines a device for welding fixed joints of pipes.

A device for welding fixed pipe joints, moved around the pipe being welded, includes welding, drive and tension mechanisms, and support rollers. The device is made in the form of hard links, with the installation of welding, drive and tension mechanisms on them. The links are pivotally interconnected with the possibility of covering the pipe around the circumference. Each link contains support rollers for supporting on the outer surface of the pipe, while the distance between the outermost edges of the supporting surfaces of the rollers is at least 50 mm. The swivel connection of the links provides the ability to rotate two adjacent links only around the axis of the swivel, parallel to the axis of the pipe being welded, while one or more swivel joints of the device links are detachable.

The welding mechanism comprises a welding torch and a drive system and is mounted on at least one link.

A drive mechanism for moving the device around the pipe is mounted on at least one link.

The tension mechanism is mounted on one of the links for tensioning and clamping the device to the pipe with the possibility of regulating the magnitude of the tension using an elastic element, for example, in the form of a system of springs.

The sequence of arrangement of links in the device may be different. Installation of mechanisms can be combined. For example, drive and tension mechanisms can be installed on one link.

At least one link has a drive mechanism that transmits torque from the power source to the axis with support rollers to allow the device to move around the axis of the pipe.

The tensioning mechanism mounted on one of the links has an elastic element to maintain the interference of the device on the pipe being welded by changing the size between the hinge axes of the link with the tensioning mechanism and the adjacent links.

The variable size between the axes of the hinges connecting the links adjacent to each other on the link on which the tensioning mechanism is mounted provides an elastic element, which can be, for example, spring. The elastic element serves to maintain interference with a slight change in size between the hinge axes due to the permissible or undesirable ovality of the pipe, collision of the support rollers on the longitudinal joint of the pipe, impact of the support rollers on welding sprays and other possible obstacles. The tensioning mechanism provides the necessary clamping of the device to the pipe for stable operation and the ability to install the device on various pipe diameters.

Thus, the above main parts of the device can be spaced into different links. This allows you to significantly reduce the dimensions of the device both in the radial direction (the height of the device at the highest point) and in the direction along the axis of the pipe being welded (its width). If necessary, the main mechanisms of the device can be arranged together on one link, for example, tensioning and driving mechanisms.

One, two or more connections between the links are made detachable, for example, in the form of a hook or hooks, fixed on the hinged connections between the links for quick opening of the device.

The essence of the claimed invention is illustrated by illustrative material presented in the form of diagrams.

Brief Description of the Drawings

FIG. 1 - kinematic arrangement of a device for welding pipes with the device of all the main mechanisms at different links, cross section.

FIG. 2 is a scan of a device with a different layout than in FIG. 1, when viewed from the side (kinematic diagram).

FIG. 3 - kinematic diagram of the sweep of the device when viewed from above.

FIG. 4 is a kinematic arrangement of a device for welding pipes on a pipe when installing welding mechanisms on two links.

The device consists of links 1, 2, 3, 4, interconnected by hinges 5, with axes 6. Each link 1, 2, 3 and 4 has support rollers 7 with axes 8. Support rollers 7 serve as a support for the device for welding on a pipe and means of moving around her.

The ability to rotate any two adjacent links 4, or 4 and 3, or 1 and 2 only around the axis 6 of the hinge 5 provides not only the design of the hinge 5 itself, but also a sufficient distance between the outermost edges of the supporting surfaces of the rollers 7.

The drive mechanism mounted on the link 1 comprises a drive 9, for example, an electric motor, and a mechanical transmission 10 transmitting torque to the axis 8 of the support rollers 7 of the link with the drive mechanism.

The welding mechanism can be installed on one link 2 (Fig. 1), on two links 2 (Fig. 4) or more (not shown). The welding mechanism includes a welding torch 11 and a drive system 12, providing movement of the welding torch 9 in a given direction when performing welding work.

The tension mechanism mounted on a separate link 3 provides tension to the device for welding on the pipe and its pressure against the pipe. The tensioning mechanism 3 has an elastic element 13, for example, spring, to maintain the tightness of the device for welding during welding. The tension mechanism, link 3, provides the ability to change the size of the link when installing the device on various pipe diameters. The interference is maintained by changing the size between the hinge axles 6 of the link 3 with the tensioning mechanism and adjacent links, for example, 4 and 1 (Fig. 1 and Fig. 4).

Links 4 perform a connecting function. Their number is determined by the diameter of the pipes being welded.

At least one swivel 5 'of the links 1, 2, 3, or 4 of the device is made detachable, for example, in the form of a hook 14.

In FIG. 4 shows a kinematic diagram of a device in which two welding mechanisms are arranged on two links 2 in series to reduce welding time.

The implementation of the invention

The device that is open when inoperative is installed next to or at the junction of the pipes. The device is closed in a ring, engaging a detachable connection 14 with a detachable hinge 5 'of the device.

Using the tension mechanism mounted on the link 3, adjust the tension of the device and its clamp to the welded pipe.

When installing the device on the pipe, the axis of the rollers are located along the axis of the pipe.

After installation, the welding mechanism (link 2) and the drive mechanism (link 1) are activated, according to the specified welding algorithm.

After performing the weld, the device is removed from the pipe in the reverse order. The device is configured for different diameters of the pipe to be welded by changing the number of interconnected links 4 of the device and the operation of the tensioning mechanism, which has the ability to change size between the axles 6 connecting the adjacent links.

The ability to maintain the interference is provided by an elastic element, for example, in the form of a system of springs 13, which regulates the change in size between the hinge axles 6 of the link with the tension mechanism and its adjacent links.

The stiffness of the links and the hard work of the articulated joints of the links, allowing movement (rotation) only around the hinge axis, a wide distance between the extreme outer faces of the supporting surfaces of the rollers 7, allows the device to accurately follow the welding joint without deviating from the orbital path of the weld due to permissible ovality or other deformations pipes, such as welding spatter or a transverse weld under the support rollers 7. Thus, the possibility of deformation of the device in the plane of the ring and the installation of the axes of the swivel joints of the links of the device parallel to the axis of the pipeline.

The inventive device allows by reducing the size of the device to use it for welding pre-insulated pipelines in cramped conditions, to ensure the ease and speed of installation of the device on the welded pipeline. A distinctive advantage of the device is the ability to realize a large number of degrees of freedom of movement of the welding torch with small dimensions, namely: moving along the joint, moving across the joint, moving the torch in the radial direction and changing the angle of the torch relative to the joint. Thus, the use of a welding device in operation can improve the quality of welding joints and reduce welding time.

INFORMATION SOURCES

1. Patent No. 2441738 RU, IPC B23K 37/053; B23K 37/02. An orbital holder comprising at least two interconnected elements in the form of annular segments; A device for butt welding of pipes for forming a pipeline containing such an orbital holder / Dupont Thierry (FR), etc .; Serimax (FR). - 2008141709/02; Claim 03/28/2007, Publ. 02/10/2012.

2. Patent No. 2049633 RU, IPC B23K 37/053; B23K 9/028; B23K 31/02; Device for multi-pass welding of fixed pipe joints / Gorlov E.I. and etc.; Central Research Institute of Shipbuilding Technology. - Application 5030201/08; Claim 02/04/1992, Publ. 12/10/1995.

3. Patent No. 1465959 GB, IPC B23K 37/053; B23K 9/028; B23K 37/00. Pipe welding apparatus_ / MITSUI SHIPBUILDING ENG. - JP19730047906; Claim 04/26/1973. Publ. 04/25/1974.

4. Patent No. 3102187 US. Apparatus for welding pipes / George A. Coscia. - No. 69025; Claim 11/14/1960; Publ. 08/27/1963.

Claims (4)

1. A device for welding fixed joints of pipes, comprising a support and connecting element made in the form of rigid links pivotally connected to each other with the possibility of gripping the pipe around the circumference and moving along it, located on the supporting and connecting element of the drive mechanism, to move the specified element around pipes, and a welding mechanism, moreover, support rollers are installed on each link for supporting on the outer surface of the pipe, and the articulation of the links is made with the possibility of the turn of two adjacent links only around the axis of the swivel, parallel to the axis of the pipe, while at least one swivel of the links is detachable, characterized in that it is equipped with a tension mechanism mounted on the supporting and connecting element with the possibility of tensioning and clamping to the pipe, and the distance between the outermost edges of the supporting surfaces of the coaxial rollers is at least 50 mm. 2. The device according to claim 1, characterized in that the welding mechanism comprises a welding torch and a drive system for moving it and is installed on at least one link. 3. The device according to claim 1, characterized in that the aforementioned drive mechanism is installed on at least one link. 4. The device according to p. 1, characterized in that the tensioning mechanism is mounted on one of the links with the ability to control the magnitude of the tension using an elastic element, for example, in the form of a system of springs.

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