RU2426611C2 - Method of removing flesh from pipeline weld seam inner surface and flesh trimmer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: flesh is removed by annular cutting tool forced inside pipeline by air or fluid pressure. Flesh trimmer comprises casing with cutting head and support rolls and differs from known designs in that trimmer piston consists of head and tail parts coupled to turn relative to each other in three dimensions. Tail section comprises hollow case with cleaning and supporting disk fitted thereon and separated by spacing elements. Head section consists of casing with cutting heads made up of pyramid-like mandrels with inner cutting surface arranged between two disk supports. Piston differs from known designs in that mandrel surface is provided with cutting edges directed toward pyramid base. Two mandrel sections are used. Said mandrels in one disk are shifted relative to those in another disk.

EFFECT: higher efficiency of cutting.

Description

The invention relates to methods and devices for removing the burr from the inner surfaces of the welds of pipelines, in particular gas and oil pipelines, and can be used to remove the inner ring burr after butt welding of pipes, more precisely, multiple joints over a long pipeline.

In the production of electric-welded pipes, their serious drawback is the presence of an internal burr reaching 3-5 mm in height, which complicates further redistribution, reduces the performance of pipes and limits their scope.

Known methods for removing internal burrs in flash butt welding of pipes, implemented in the devices described in [1, 2], namely, that the inner burr is removed mechanically by cutting with a special device moving across the pipe along the line along the seam and driven by the butt welder pipe welding, i.e. in constructive connection with welding equipment.

A device for removing internal burrs on pipes after welding is described in [1], comprising a housing with an end flange on one side for fastening, a faceplate rotating with a drive on rolling bearings and equipped with holders, cutting tools and track rollers, a mechanism radial feed of the cutting tool, pipe clamping mechanism, hydraulic power and control system.

The radial feed of the cutting tool is driven by a hydraulic cylinder controlled by a mechanical spool interacting with its roller with a stop mounted on the cutting head housing. The device is cantilevered on the ferrule of an electric contact welding pipe.

The main disadvantage of the device for removing internal burrs on pipes after welding is the narrow scope of its application. Due to the cantilever version of its implementation, it can most effectively be used in stationary field installations for welding three-pipe sections of pipelines operating according to a “shuttle” technological scheme.

In the mobile complex “Sever-1” for electric-contact welding of individual pipes and three-pipe sections with a diameter of 1420 mm into a continuous pipe thread, the in-pipe equipment is equipped with a hollow rod in front with a cable supplying an 800 kW transformer.

The second disadvantage of the device is the constant radial feed of the cutting tool per revolution of rotation of the faceplate. In the known device for removing internal burrs, it is almost directly proportional to the time of interaction of the spool roller with focus.

The shape and magnitude of the reinforcement of the electric contact weld depend on the technological parameters of the welding and the thickness of the welded pipe walls. In this case, the gain width increases as one approaches the inner surface of the pipes. In this regard, the same radial feed of the cutting tool per revolution of the faceplate rotation increases the time of removal of the burr and irrationally loads the drive of rotation of the faceplate of the device for removing the inner burr on the pipes after welding.

It is also known a device for removing internal burrs on pipes after welding [2], adopted as a prototype, comprising a housing with an end flange on one side for mounting, a faceplate with cutting heads equipped with holders, cutting tools and track rollers rotating with a drive on rolling bearings , a radial feed mechanism of a cutting tool, a pipe clamping mechanism and a hydraulic power and control system, according to the invention, the housing is made of three interconnected parts and is equipped with an end fl On the other hand, the middle part of the body is welded with annular and axial cavities, the faceplate with cutting heads equipped with holders, cutting tools and track rollers is mounted on the middle part of the body, the radial feed mechanism of the cutting tool is made in the form of the middle part of the body placed inside the axial cavity a hydraulic cylinder rigidly connected to the hydraulic cylinder housing and located between the rolling bearings on the middle part of the ring sleeve housing with the outer conical surface, and inter the conical rollers and return springs operating with it installed in sliders moving in guide bushings mounted in the faceplate and bearing cutting heads, the rod of said hydraulic cylinder being fixed on the middle part of the housing, and the hydraulic cylinder housing mounted with axial movement, in addition, the cutting tool is spring loaded relative to the holder.

Such a constructive implementation of the device will allow it to be mounted both cantilever in stationary field installations and in the middle part, for example, in the Sever-1 complex.

The disadvantages of the described method and devices that implement this method are limited capabilities, as well as its complexity and high energy intensity.

Descalers described:

- work complete with welding equipment, which excludes their autonomous operation, and, as a result, limit the possibilities of application;

- designed for pipes of exactly the same diameter, which limits the possibility of their use;

- have a complex and bulky design, which affects their cost, as well as on the possibilities of use;

- the constructive implementation of the filler strippers involves the movement of the cutter, removing the burr - in a circular line, which leads to a low cleaning speed and, as a result, limits the welding speed, and this is a significant drawback for the production of pipes;

- have limited capabilities due to the lack of the ability to clean long lines of pipelines containing multiple pipe joints.

The technical problem solved by this invention is to expand the capabilities of the method of removing grata while providing increased productivity.

The problem is solved by the method of removing the inner burr from the inner surfaces of the welds of pipelines by mechanical cutting, characterized in that the burr is cut with an annular cutting tool from the entire surface of the annular weld at the same time, the cutting tool is moved along the pipeline, the cutting tool is moved under air, inert gas or liquids.

The problem is also solved by a piston-stripper containing a housing with cutting heads and track rollers, characterized in that the piston is made in the form of two sections - the head and tail, interconnected to rotate relative to each other in three dimensions, for example, due to a ball joint couplings, the tail section contains a hollow body with blocks of cleaning and support disks mounted on it separated by spacer elements, the head section consists of a body on which cutting heads are mounted made in the form of pyramidal firmware with an external cutting surface fixed between the disk supports, the track rollers and a buffer protruding outside the roller support are directly adjacent to the housing from the front side.

The piston also differs in that the surface of the firmware is made with cutting edges directed toward the top of the pyramid.

The piston also differs in that the number of firmware sections is two, and the firmware in the disks is installed with a shift relative to the firmware of another disk.

The method of removing internal burrs on pipes after welding with mechanical cutting with an annular cutting tool allows the use of simple and cheap equipment for a large range of pipe diameters, in large sections of a pipeline with many joints, to remove the burr with high speed.

In Fig. 1, the inventive piston-stripper is shown, in Fig. 2 is a firmware section, in Fig. 3 is a firmware design.

The pickup piston contains a hollow housing 1 with blocks of cleaning 2 and supporting 3 discs mounted on it, separated by spacer elements 4, the housing in the rear of the section is plugged, the housing of the head portion 5 on which firmware 6 is installed, made in the form of rectangular pyramidal elements with external serpentine cutting surface, the surface is made with peaks directed towards the top of the pyramid, the number of sections of firmware is two, firmware 6 is fixed between the disk supports 7 and the housing 5, the wheels are pulled together You have a screed 8, six support rollers 9 are directly adjacent to the housing on the front side, for example, from polyurethane, mounted on a cylindrical support 10, covering a buffer 11 that extends beyond the support 10 of the rollers 9, both cases 1 and 5 are connected by a hinged clutch 12, the device is equipped with a holder of magnets 13 for capturing chips removed by the firmware during passage through the pipeline.

Firmware 6 is made of high-strength material, for example, steel HVG, XG, 9XC, X12M.

Cleaning the internal surfaces of the pipelines is as follows.

Stocking of the piston-stripper in the pipeline begins with the head part - the body of the stripper 5, which has six rollers 9, mounted on a cylindrical bearing support 10, which makes it easy to roll the piston-stripper into the pipeline.

Next, the tail portion of the piston is stocked up, while the supporting disk 3, having a diameter slightly smaller than the diameter of the pipeline, passes into the pipe freely, and the cleaning disk 2 is deformed, providing a snug fit to the walls.

The piston-puller placed in the pipeline being cleaned moves along the pipeline along with the flow of the pumped product due to the pressure difference in front of and behind the piston, i.e. a pressure drop of 0.04-0.05 MP is created. While the track rollers 9 provide movement along the pipe of the device, the removal of the burr is carried out by two rows of piercings 6, which are cutting edges in contact with the surface of the welds of the pipeline, cutting the burr. The removal of burrs is carried out simultaneously from the entire surface of the annular seam due to the annular execution of the cutting tool - sections of firmware.

The execution of firmware in the form of pyramidal rectangles with a serpentine cutting edge provides intensive cutting of the burr, its removal from the processing zone is carried out by magnets 13.

Due to the implementation of firmware in two rows with a shift, a high degree of removal of grata is provided.

The proposed solution allows you to expand the application of the method and device for removing internal burrs on pipes after welding due to the autonomy of the equipment.

The movement is carried out due to the pressure of air or liquid on the tail piston, which ensures its use in pipelines of unlimited length. This fact expands the possibilities of applying the method and device.

The inventive method and device are simple to implement, do not require additional energy sources for passing the piston and carrying out cleaning from grata, providing passage through the pipe at a speed of 25-30 m / s, which significantly, in power dependence, exceeds the cleaning speed of the above devices and other known analogues.

The inventive method and device are universal in terms of use in pipelines for various purposes, different diameters from 500 to 1420 mm

The inventive device is effective and ensures reliable operation in pipelines of various configurations due to the articulation of two parts.

Information sources

1. US patent No. 4084484, CL. 90-24, 1978.04.18.

2. RF patent 2257989, IPC 7 В23К 37/08, 2005.08.10.

Claims (2)

1. The method of removing internal burrs on pipes after welding by mechanical cutting, characterized in that the cutting tool is moved along the pipeline due to the pressure of the air, inert gas or liquid pumped through the pipeline, while simultaneously removing the burr from the entire surface of the annular weld. 2. A piston-stripper containing a housing with cutting heads and track rollers, characterized in that the piston is made in the form of two sections - the head and tail, interconnected to rotate relative to each other in three dimensions: the tail section contains a housing with mounted on it with blocks of cleaning and supporting discs separated by spacer elements, and the head section consists of a housing on which cutting heads are installed, made in the form of pyramidal firmware with an external cutting surface in the idea of serpentines with peaks directed towards the top of the pyramid, the firmware is fixed in two rows between two disk supports and the housing, to which the support rollers are attached on the front side, mounted on a support covering the buffer protruding beyond its boundaries, while the firmware in the rows are installed with a shift regarding firmware of another series.

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