RU214397U1 - UNIT FOR ADJUSTING THE POSITION OF THE PRESSURE ROLLER FOR APPLICATION OF A POLYMER COATING ON THE PIPE - Google Patents

Abstract

The utility model relates to devices for applying protective coatings in the form of a polymer film (a layer of polyethylene or polypropylene) on pipes and is intended for rolling a polymer layer to the surface of pipes to protect them from corrosion and mechanical damage for oil and gas pipelines, drinking and industrial water pipelines, technological and field pipelines . The technical result of the claimed utility model is the reduction of time and labor costs when coating pipes, increasing the productivity of coating and coating quality due to automatic control of the position and rolling force, which reduces the changeover time when switching to another size by up to 50%. The specified technical result is achieved by improving the adjustment unit of the pressure roller for applying a polymer coating to the pipe. The claimed assembly comprises guides with a frame installed in them, made with the possibility of moving along the guides, a frame located on the frame with a turntable fixed to it through a movable support with two pneumatic cylinders mounted on it, pistons that are connected through levers to the end parts of the roller shaft, made with the possibility of cooling and translational-rotational movement relative to the axis of the pipe and adjusting its position with the help of pneumatic cylinders driven by electric drives, and the opposite end of the lever is pivotally connected to the support fixed on the frame, while the turntable is configured to control the pressing of the stitching roller to pipe. 2 w.p. f-ly, 2 ill.

Description

The utility model relates to devices for applying protective coatings in the form of a polymer film, in particular a layer of polyethylene or polypropylene, on pipes and is intended for rolling a polymer layer to the surface of pipes to protect them from corrosion and mechanical damage for oil and gas pipelines, drinking and industrial water pipelines, technological and field pipelines.

Currently, the following solutions are known in the field of applying polymer coatings to pipes.

So, from the description to the patent of the Russian Federation No. 2675914 (published on December 25, 2018), a roller for compressing a protective sheathing made of polymer material around the pipeline is known. The roller is made with the possibility of rotation around its axis, mounted on the shaft with the first tubular part passing around the shaft and with its variable elasticity along the axis of rotation, also contains the second tubular part. The latter is put on the first tubular part. The first tubular part has more elasticity at the ends than at the center of the roller. There is also an elastic shell configured to define the surface of the roller. SUBSTANCE: method for squeezing protective sheathing made of polymeric material includes stripping the area from the coating and positioning the roller on the stripped area so that the axis of rotation of the roller is parallel to the longitudinal axis, while the protective sheathing is wrapped around the pipeline.

Also from the patent of the Russian Federation No. 2669096 (published on 08.10.2018) a device is known for applying a protective sheet of polymeric material around an undercut on the pipeline, containing a frame located next to the pipeline, continuing along the longitudinal axis; a manipulator mounted on a frame and containing a guiding system configured to move between a starting position at a distance from the pipeline and an operating position in which the guiding system is located around the pipeline; and an extrusion head selectively movable along the guiding system and around the pipeline to supply and apply a protective sheet around the undercut on the pipeline.

As the closest analogue, the solution disclosed in the Eurasian patent No. 022072 (published on October 30, 2015) and related to a device for applying a polymer coating to a pipe or part of a pipe was adopted. The device contains means for applying a layer of polymeric material (applicator), a roller for pressing the applied polymer, a means for moving around the circumference of the applicator and the roller along the perimeter of the pipe or part of the pipe, and a drive for actively rotating the roller around its central axis at a predetermined speed, while how the roller is mounted on a frame with wheels and moves in a circle along the perimeter of the pipe or part of the pipe.

The disadvantages of the known device is the increase in time and labor for setting up the device and coating, the inability to automatically control the pressing of the roller - all operations are performed manually, which can lead to deterioration in the quality of the applied coating, in particular, to areas with a loose fit or uneven thickness. In addition, a cart with wheels and a roller, which is fastened to the pipe by means of belts, is used for coating a limited length of the pipe, and therefore has a low productivity.

The technical problem solved by the proposed solution is the elimination of these shortcomings.

The technical result of the claimed utility model is the reduction of time and labor costs when coating pipes, increasing the productivity of coating and coating quality due to automatic control of the position and force of rolling, which reduces the changeover time when switching to another size by up to 50%.

The specified technical result is achieved by improving the control unit of the pressure roller for applying a polymer coating to the pipe.

The claimed node contains:

guides with a frame installed in them, made with the possibility of moving along the guides,

a frame located on the frame with a turntable fixed to it through a movable support with two pneumatic cylinders mounted on it,

pistons, which are connected through levers to the end parts of the roller shaft, made with the possibility of cooling and translational-rotational movement relative to the axis of the pipe and adjusting its position with the help of pneumatic cylinders driven by electric drives, and the opposite end of the lever is pivotally connected to a support fixed on the frame , while the turntable is configured to control the pressing of the stitching roller to the pipe.

In addition, to improve coating application, the pressure roller is made with the possibility of additional cooling with water and air, which makes it possible to exclude its overheating, adhesion of the coating to the roller and the formation of foreign inclusions in the applied coating layer.

Owing to the above structure of the assembly for adjusting the position of the bed of the pressure roller for coating the pipe, it is possible to adjust the position of the position of the pressure roller during the coating of the pipe. During the production process, the silicone roller tightly presses the polyethylene sheet to the pipe moving rotationally-translationally along the coating line. This innovation provides the ability to adjust the position of the bed of the pressure roller during the application process using electric drives according to the following parameters:

movement along the pipe body at a distance of 300 mm;

moving perpendicularly along the pipe body at a distance of 200 mm;

provides the possibility of turning the platform together with the roller relative to the axis of the pipe up to 12;

speed of movement of a bed of a roller (to the right/to the left, forward/backward) - 200 mm/min. Turning speed 100 mm/min.

The node movement control is displayed on the dashboard. Buttons on the panel:

move left / right - 2 pcs.;

moving forward / backward - 2 pcs.;

spread - 2 pcs.

The panel also displays an indication of the position of the frame at the end extreme points of the movement of the allowable position.

The solution is further explained by reference to the figures, which show the following:

In FIG. 1 shows a general view of the patented node;

In FIG. 2 is a section A-A of the assembly of FIG. one.

The assembly contains guides 1 with a frame 2 installed in them, made with the possibility of moving along the guides, a frame 3 located on the frame with a turntable 5 fixed to it through a movable support 4 (see Fig. 2) with two pneumatic cylinders 6 mounted on it, pistons which through the levers 7 are connected to the end parts of the shaft of the roller 8, and the opposite end of the lever 7 is pivotally connected to the support 9 fixed on the frame.

The pressure roller is preferably silicone coated and can be cooled with water and air. The silicone coating is distinguished by increased wear resistance, the required hardness characteristics, which allow the coating to be rolled without dents and unevenness exceeding tolerances. In order to prevent overheating of the silicone coating, the pressure roller is made hollow to cool it with water, which is supplied and removed to the shaft of the pressure roller through rotating connections. Fittings 10 are provided at the ends of the stitching roller for connection with water hoses.

For additional cooling of the silicone coating of the roller, a uniform blowing of the silicone surface with compressed air through a special blowing tube 11 with collar holes (not shown) is provided. The tube also has a fitting for connecting to a compressor (not shown).

Two guides are located parallel to each other and are made of channels, which are fixed to the floor with the help of embedded elements. A frame 2 is fixed on the guides 1, made in the form of a metal box, which moves along the axis of the pipe with the help of an electric drive installed next to the structure on a separate foundation (not included in the frame design).

The frame 3, made in the form of a metal box, is fixed on guides perpendicular to guides 1, which makes it possible to press the roller against the pipe body.

Swivel bearing 4 is a bearing assembly that provides translational-rotational motion.

The roller pressure is controlled by pneumatic cylinders, which are driven by the pressure of the incoming air generated by an external compressor.

Pneumatic cylinders are one-sided, magnetic pneumatic cylinders with an anti-rotary platform. Pneumatic cylinders are characterized by a long service life, silent operation.

The operation of the device is as follows.

The pipe enters the pipe coating line, the coating takes place on the same line. In this case, shot blasting, heating, spraying of an epoxy coating, application of an adhesive and subsequent application of a molten polyethylene coating from an extruder with its further cooling take place. The pipe moves in a rotational-translational manner above the adjustment unit for the position of the roller.

The roller 8 is lowered and raised to the surface of the pipe with the help of two pneumatic cylinders 6, while the position of the piston is determined by magnetic position sensors that can be fixed on the pneumatic cylinders 6. The pneumatic cylinders are made with elastic braking.

During the coating process, the silicone roller 8 tightly presses the polyethylene sheet at a pressure of 2 to 6 bar at a temperature of 210-250°C. The pressing pressure is regulated by changing the pressure in the pneumatic cylinders 6. The pressure is pumped by an external compressor and controlled by pressure gauges installed on the operator's control panel.

Depending on the required "opening" of the cylinder, the compressed air reducer is adjusted on the operator's control panel. Thanks to this design feature, the pressure values of compressed air, and hence the force of pressing the roller against the pipe, on the left and right pneumatic cylinder 6 can be adjusted separately and the pressure value can be changed at any time.

The pressing pressure of the stitching roller to the pipe is selected empirically, depending on the assortment.

Based on the fact that the pipe moves in a rotational translation, it is required to press the roller against the pipe towards the axis of the pipe so that as the pipe passes through the roller, the bubbles are squeezed out from under the coating.

The direction of the air flow must prevent it from getting under the canvas, as this will lead to the formation of air bubbles under the polyethylene coating. This is achieved due to the tube 11, which supplies compressed air to the surface of the roller 8, in which there are holes directed towards the roller.

Depending on the assortment produced, the isolation line fitter adjusts the position of the blower tube 11 by unscrewing the nut and changing the position of the blower tube relative to the roller axis.

Thus, the proposed solution will automate the coating process and select individual process parameters depending on the pipe assortment and the type of coating being applied.

Claims (3)

1. The unit for adjusting the position of the stitching roller for applying a polymer coating to the pipe, characterized in that it contains guides with a frame installed in them, made with the possibility of moving along the guides, a frame located on the frame with a turntable fixed to it through a movable support with mounted on it two pneumatic cylinders, the pistons of which are connected through levers to the end parts of the roller shaft, which is made with the possibility of cooling and translational-rotational movement relative to the axis of the pipe and adjusting its position with the help of pneumatic cylinders driven by electric drives, and the opposite end of the lever is pivotally connected to the frame with a support, while the turntable is made with the possibility of adjusting the pressing of the stitching roller to the pipe. 2. The unit for adjusting the position of the stitching roller for applying a polymer coating to the pipe according to claim 1, characterized in that the stitching roller is made with a silicone coating. 3. The unit for adjusting the position of the stitching roller for applying a polymer coating to the pipe according to claim 2, characterized in that the stitching roller is made with the possibility of cooling it with water and air.

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