RU2733751C1 - Device for removal of external insulation from ends and / or preparation of pipe ends - Google Patents

Abstract

FIELD: transportation.

SUBSTANCE: invention relates to pipeline transportation of oil products, liquid and gaseous media, namely to cleaning of external surface of end sections of pipes from insulation and preparation of ends for further performance of construction and installation jobs and butt welding. Device for removal of external insulation from ends and / or preparation of pipe ends includes housing, faceplate with tool holders, installed uniformly along perimeter and equipped with cutters, drive and feed mechanism, and rams. Rams are installed in housing holes with possibility of radial movement till interaction with pipe from inside under action of cone pressing from inside, which is installed with possibility of movement relative to housing by means of screw with mechanism of mechanical rotation. Housing is equipped with central hole with thread for screw, rigidly connected with cone. Between mechanical rotation mechanism and cone with screw lengthwise cylindrical guide is installed. Feed mechanism is made in the form of the central hole in the face plate under the longitudinal guide. Each cutter holder is made in form of L-shaped angle with radial hole for cutters and radial handle acting as drive. Cutters are inserted into the cutter holders holes with possibility of movement and fixation in the selected position.

EFFECT: proposed device is simple in operation, reliable in manufacture, operation and maintenance, allows to work also in field conditions, to remove insulation from ends and / or to prepare pipe ends due to simple design.

5 cl, 3 dwg

Description

The invention relates to pipeline transportation of oil products, liquid and gaseous media, namely to cleaning the outer surface of pipe end sections from insulation and preparation of ends for subsequent construction and installation work and butt welding.

Known working body of the machine for removing insulation from the outer surface of the pipeline (patent RU No. 2395353, IPC В08В 9/023, publ. 27.07.2010 Bull. No. 21), containing a rotor with cleaning tools attached to levers mounted on the axles with the possibility of rotation around its axis, and clamping devices for pressing the cleaning tools to the surface of the pipeline, and the clamping devices are made in the form of rocker kinematic pairs with an elastic element, the levers are made with two arms, while the cleaning tool is fixed on one of their arms, and the other arm is pivotally connected to the clamping device ...

The disadvantages of this working body are the complexity of the design due to the presence of a large number of small precisely mated parts, which leads to low reliability and low maintainability, especially in the field, a narrow scope due to the impossibility of processing pipe ends for welding, as well as the complexity of use in field conditions during the construction of pipelines due to the need to power the power drive and a non-universal cleaning tool for stripping insulation.

It is also known a device for cleaning the outer surface of the end sections of pipes from insulation (patent RU No. 2522346, IPC В08В 9/023, publ. 10.07.2014 Bull. No. 19), containing a cleaning tool configured to rotate and connected to a lever, characterized in that that the cleaning tool is made in the form of a regular straight prism or a cylinder with a side hole having dimensions sufficient to secure the outer insulation during rotation, the lever is connected to the end of the cleaning tool, and the lever is equipped with at least one handle located at a distance from the axis of rotation sufficient to overcome the adhesion force of the insulation to the pipe.

The disadvantages of this device are the low quality of cleaning the pipe surface from insulation due to its physical separation, and a narrow field of application due to the impossibility of processing pipe ends for welding.

The closest in technical essence is a device for chamfering pipes (patent RU No. 2030256, IPC B23B 5/16, publ. 03/10/1995 Bull. No. 07), containing a body, a rotary drive of the faceplate with cutters attached to it, a feed mechanism and a fastening mechanism with dies and crackers, and the fastening mechanism is made in the form of a two-stage cone mounted with the possibility of movement relative to the body by means of a screw, while the conical steps are designed to interact with the dies, and the feed mechanism is made in the form of a hollow screw mounted in the body with the possibility of movement , and a slider connected to it, intended for mounting the faceplate and a bracket with a drive introduced into the device.

The disadvantages of this working body are the complexity of the design due to the presence of a large number of small precisely mated parts, which leads to low reliability and low maintainability, especially in the field, a narrow field of application due to the impossibility of removing insulation from the ends of pipes, as well as the complexity of use in field conditions during the construction of pipelines due to the need to power the power drive and a non-universal cleaning tool for chamfering.

The technical objective of the present invention is to create a simple, universal and reliable design of a device for stripping external insulation from the ends and preparation of pipe ends, which also makes it possible to work in the field, to remove insulation from the ends and / or prepare pipe ends due to a simple design, lack of power for operation and adjustable radial overhang of cutters and dies.

The technical problem is solved by a device for removing external insulation from the ends and / or preparing the ends of pipes, including a body, a faceplate with tool holders installed evenly around the perimeter and equipped with cutters, a drive and a feed mechanism, dies installed in the body openings with the possibility of radial movement before interacting with pipe from the inside under the action of a cone pressing from the inside, which is mounted for movement relative to the body by means of a screw with a mechanical rotation mechanism.

What is new is that the body is equipped with a central hole with a thread for a screw, rigidly connected to the cone, a longitudinal cylindrical guide is installed between the mechanical rotation mechanism and the cone with a screw, and the feed mechanism is made in the form of a central hole in the faceplate for a longitudinal guide, and each tool holder is made in the form of an L-shaped corner with a radial hole for the cutters and a radial handle playing the role of a drive, while the cutters are inserted into the holes of the tool holders with the ability to move and fix in the selected position.

It is also new that the body between the end, located on the side of the mechanical rotation mechanism, and the body openings is equipped with transverse successive risks for visual control of the depth of the body insertion into the pipe.

It is also new that between the cone with the screw and the faceplate on the longitudinal guide a thrust sleeve is installed with the ability to move, made with the ability to interact with the body and faceplate when removing the insulation to the required length from the end of the pipe.

It is also new that on the outer surface of the cutters, successive transverse notches are made for visual control of the cutter protrusion from the hole of the tool holder.

FIG. 1 shows the device from the side of the rotation mechanism.

FIG. 2 shows a section a-a of FIG. 1.

FIG. 3 shows the device in isometric view.

The device for removing external insulation from the ends and preparing the ends of pipes (not shown) includes a body 1 (Fig. 2 and 3), a faceplate 2 (Fig. 1 - 3) with tool holders 3, installed evenly around the perimeter and equipped with cutters 4 (Fig. 2 and 3), by the drive - handles 5 and the feed mechanism - by the central hole 6, the dies 7 installed in the holes 8 of the housing 1 with the possibility of radial movement until interaction with the pipe from the inside under the action of the cone 9 pressing from the inside (Fig. 2), which is installed with the ability to move relative to the housing 1 by means of a screw 10 with a mechanical rotation mechanism 11 (Figs. 1 - 3) (for example, a through hole 12 with a lever 13 or a square for a tool for rotation - not shown, the authors do not pretend to be). The body 1 (Fig. 2) is equipped with a central threaded hole 14 for the screw 10, rigidly connected to the cone 9. Between the mechanical rotation mechanism 11 (Fig. 1 - 3) and the cone 9 with the screw 10, a longitudinal cylindrical guide 15 is installed (Fig. 2 and 3) for the central hole 6 in the faceplate 2. Each tool holder 3 is made in the form of an L-shaped corner with a radial hole 16 for the cutters 4 and a radial handle 5. The cutters 4 are inserted into the holes 16 of the tool holders 3 with the possibility of moving and fixing in the selected position ( with the help of a bolt 17, a wedge, a locking mechanism or the like - not shown, the authors do not pretend to be).

The body 1 (Fig. 2 and 3) between the end located on the side of the mechanical rotation mechanism 11 and the holes 6 of the body 1 can be equipped with transverse sequential risks 18 (Fig. 3) for visual control of the depth of insertion of the body 1 into the pipe.

Between the cone 9 (Fig. 2) with the screw 10 and the faceplate 2 on the longitudinal guide 15, a thrust sleeve 19 can be moved with the ability to interact with the body 1 and faceplate 2 when removing the insulation to the required length from the end of the pipe.

On the outer surface of the cutters 4 (Figs. 2 and 3), successive transverse marks (not shown) can be made to visually check the protrusion of the cutter 4 from the hole 16 of the tool holder 3.

Cutters 4 can be made of high speed steel or with carbide inserts on the cutting surface (the authors do not pretend to be).

Structural elements and technological connections that do not affect the operability of the device in Fig. 1 - 3 are not shown or are shown conditionally.

The device works as follows.

After receiving an assignment for welding pipes (including those with external protective insulation), which indicates what type of coating (if any) and what diameter these pipes have, prepare the device for operation. In the holes 18 (Fig. 3) of the housing 1, located evenly along the perimeter and height of the housing 1 for reliable fixation and centering of the housing 1 (the authors do not pretend to do this), insert the dies 7 corresponding to the inner diameter of the pipes being welded. Then, the cone 9 is introduced into the housing 1 (Fig. 2) with the screw 10 before interacting with the central threaded hole 14, into which the screw 10 is pre-screwed by rotating the guide 15 only to prevent the dies 7 from falling out into the housing 1.

To remove the outer insulation at the ends of the pipes, cutters 4 are inserted into the holes 16 (Fig. 3) of the tool holders 3, adjusting them to the required overhang of their cutting part from the holes 16 of the tool holder: slightly larger (by 0.05 - 1.5 mm - in direct proportion to insulation thickness) of the pipe diameter, but smaller - the diameter of the outer insulation. Then the cutters 4 are fixed in the holes 16 (for example, with bolts 17). On the body 1, mark the depth to which it should be inserted into the pipe relative to its end to remove the insulation to the required length from the end (the end of removal is determined by the stop of the faceplate 2 in the body 1). To simplify these works, the body 1 (Fig. 2 and 3) between the end, located on the side of the mechanical rotation mechanism 11, and the holes 6 of the body 1 are equipped with transverse sequential risks 18 (Fig. 3) for visual control of the depth of the body 1 insertion into the pipe. If there is a protective insulation of pipes with low thermal destruction of the material, then removing it at a large distance from the end does not make sense, therefore, to limit the stroke of the faceplate 2 during operation of the device, use a thrust sleeve 19 (Fig. 2) installed between the body 1 by faceplate 2. The length of removal from the end of the coarse protective insulation to exclude thermal destruction of its material when welding pipes together is determined in laboratory conditions or empirically.

If it is necessary to process the ends of the pipes, cutters 4 are inserted into the holes 16 (Fig. 3) of the tool holders 3, adjusting for the required overhang of their cutting part from the holes 16 of the tool holder: a smaller pipe diameter (by 1 - 7 mm - in direct proportion to the thickness of the pipe walls and the required external bevel for welding).

To simplify visual control of the cutter protrusion (Figs. 2 and 3) from the holes 16 of the tool holder 3, successive transverse notches (not shown) are applied on the outer surface.

If it is necessary to remove the external insulation from the ends and prepare the ends of the pipes, the overhang of the cutters 4 in the holes 16 of the tool holders is carried out at the place of work.

To carry out welding work with a large number of pipe joints (for example, during the construction of a pipeline), to speed up the preparation of pipe ends for welding, two faceplates 2 are prepared in advance with different overhangs of cutters 4 from the holes 16 of the tool holders 3 (the first is for removing the outer coating, and the second is for preparing the ends of the pipes).

After carrying out preparatory work, the device is delivered to the place of work. The body 1 is inserted inside the pipe (if necessary to the required depth) so that all the dies 7 are inside the pipe. By rotating the guide 15, screw 10 is screwed into the threaded hole 14 (Fig. 2), holding the body 1 by the end protruding from the pipe. In this case, the cone 9 pushes from the inside to the outside the rams 7 located in the holes 8 of the housing 1 outward before interacting with the inner walls of the pipe for preliminary fixation. A lever 13 is inserted into the hole 12, fixed with stops 20 (Fig. 1) or a steering wheel or a special tool (not shown) is placed on a square to increase the torque transmitted to the guide 15 (Fig. 2), forming a mechanical rotation mechanism 11. Creating an additional the moment of rotation by the mechanism of mechanical rotation 11 on the guide 15, screw 10 is screwed into the threaded hole 14 with additional force, and the cone 9 pushes the dies 7 apart for the final centering and fixing of the body 1 together with the screw 10, the cone 9 and the guide 15 inside the pipe. Removing one of the stops 20 (Fig. 1), the lever 13 is removed from the hole 12 (Figs. 2 and 3) or the steering wheel or tool is removed from the square of the guide 15. Then, a faceplate 2 with tool holders 3 facing the pipe is put on the guide 15 using the central hole 6. If necessary, a thrust sleeve 19 is installed in front of the faceplate 2 (Fig. 2). The personnel carrying out the work using the handles 5 (Fig. 1) create a rotational and translational movement of the faceplate 2 (Figs. 2 and 3) towards the pipe with the tool holders 3. This removes the outer insulation or prepares the pipe end. Removal of the outer insulation from the end of the pipe stops after the faceplate (Fig. 2) stops in the housing 1 or the thrust sleeve 19.

To remove external insulation and the need to prepare the pipe end. First, the outer insulation is removed with cutters 4 while rotating along the longitudinal feed towards the pipe of faceplate 2 with toolholders 3 until it stops in the body 1 or thrust sleeve 19. After that, faceplate 2 is taken to the mechanical rotation mechanism 11, the overhang of cutters 4 in the holes 16 of toolholders 3 is rebuilt for processing the end of the pipe, or remove the first faceplate 1 from the guide 15 (to remove the outer insulation) and install the second faceplate 1 (to prepare the end of the pipe). After that, the personnel carrying out the work using handles 5 (Fig. 1) create a rotational and translational movement of the faceplate 2 (Figs. 2 and 3) towards the pipe with tool holders 3. This removes the chamfer from the pipe end and prepares the pipe end.

Upon completion of the necessary work, the faceplate 1 is removed from the guide 15, the lever 13 is inserted into the hole 12, fixed with stops 20 (Fig. 1) or a steering wheel or a special tool is placed on the square, forming a mechanical rotation mechanism 11. Guide 15 using the mechanical rotation mechanism 11 is not screw 10 is completely unscrewed from the threaded hole 14, and the cone 9 ceases to support the rams 7, which cease to fix the housing 1 inside the pipe. After that, the body 1 is removed from the pipe, folded into a container for transportation or reinstalled inside another pipe.

If necessary, operations with the installation and operation of the device are repeated by the methods described above.

To carry out the operation of removing the external insulation and preparing the ends of the pipes, no external power sources are required and no more than 30 minutes are spent, and without adjusting the overhang of cutters 4 in the holes 16 of the tool holders 3 - no more than 15 minutes. At the same time, all structural elements of the device are simple and reliable in manufacture, operation and maintenance, since there are no small and difficult-to-fit parts. At the same time, by adjusting the overhang of the cutters 4 in the holes 16 of the tool holders 3 and the selection of dies 7 with the necessary overhang from the body 1, you can configure the device to work with pipes of different diameters and with different external insulation, both for removing insulation and / or for preparing the ends, that is, the device is quite versatile.

The proposed device for stripping external insulation from the ends and / or preparing the ends of pipes is simple and reliable in manufacturing, operation and maintenance, it also allows you to work in the field, to remove insulation from the ends and / or prepare the ends of pipes due to a simple design, lack of power for operation and adjustable radial overhang of cutters and dies.

Claims (5)

1. A device for removing external insulation from the ends and / or preparing the ends of pipes, including a body, a faceplate with tool holders installed evenly around the perimeter and equipped with cutters, a drive and a feed mechanism, dies installed in the body openings with the possibility of radial movement before interacting with the pipe from the inside under the action of a cone pressing from the inside, which is installed with the ability to move relative to the body by means of a screw with a mechanical rotation mechanism, characterized in that the body is equipped with a central hole with a thread for a screw, rigidly connected to the cone, between the mechanical rotation mechanism and the cone with a screw, a longitudinal cylindrical guide, and the feed mechanism is made in the form of a central hole in the faceplate for a longitudinal guide, and each tool holder is made in the form of an L-shaped corner with a radial hole for the cutters and a radial handle playing the role of a drive, while the cutters are inserted into the hole Tool holder holes with the ability to move and fix in the selected position. 2. A device for removing external insulation from the ends and preparing the ends of pipes according to claim 1, characterized in that the body between the end located on the side of the mechanical rotation mechanism and the body openings is equipped with transverse sequential risks for visual control over the depth of the body entering the pipe. 3. A device for removing external insulation from the ends and preparation of pipe ends according to claim 2, characterized in that between the cone with the screw and the faceplate on the longitudinal guide, a thrust sleeve is installed with the ability to move, made with the ability to interact with the body and faceplate when removing the insulation on the required length from the end of the pipe. 4. A device for removing external insulation from the ends and preparing the ends of pipes according to claim 1 or 2, characterized in that successive transverse risks are made on the outer surface of the cutters for visual control of the cutter protrusion from the tool holder hole. 5. A device for removing external insulation from the ends and preparing the ends of pipes according to claim 3, characterized in that successive transverse risks are made on the outer surface of the cutters for visual control of the cutter protrusion from the hole of the tool holder.

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