RU83207U1 - DEVICE FOR THERMAL CUTTING OF LARGE DIAMETER PIPES - Google Patents

Abstract

1. A device for thermal cutting of pipes of large diameter, including a cart with wheels mounted on the shafts, a bearing cutter mounted with the possibility of changing position, and drives for longitudinal movement of the cart and turning the torch, characterized in that the cart is equipped with a rotary flange, optionally equipped with at least , with one cutter, and the wheels are placed on the cart with the possibility of interaction with the inner surface of the pipe. ! 2. The device according to claim 1, characterized in that between the drive pair of wheels of the trolley at its other end there is a central steering wheel, in the same plane with which a pair of clamping wheels and current collector rollers are oppositely placed, connected by a lever mechanism with the possibility of radial movement. ! 3. The device according to claim 1, characterized in that the rotary flange is made in the form of a protective casing mounted on the central tubular element of the trolley, inside of which cutters are mounted at equal distances from each other with the possibility of radial movement. ! 4. The device according to claim 1, characterized in that the rotary flange is provided with a peripheral tubular screen, inside which the central tubular element of the trolley is missing. ! 5. The device according to claim 1, characterized in that the cutters are made in the form of plasmatrons, which are equipped with ball bearings mounted with the possibility of contacting with the inner surface of the pipe.

Description

The utility model relates to the field of thermal cutting and can be used for automatic cutting of large-diameter pipelines, mainly on high-quality scrap metal in the desert, steppe, and tundra field conditions.

Traditionally, the cutting of pipelines in the field, including large diameters (up to 1620 mm) with a significant thickness (up to 50 mm), such as a gas pipeline, is carried out by pipe-cutting devices (for example, RU No. 2041032, No. 2156675), which are devices covering the pipe, bearing cutters or abrasive blast heads that cut a pipe ring from one installation. Such devices are inefficient for cutting large pipes, and the process itself is time-consuming and highly costly, because installation and lifting equipment is required, high expenses for transportation of large-sized pipe rings and their subsequent cutting into high-quality scrap metal in accordance with GOST 2787-75.

The closest in technical essence and result is a device for thermal cutting of pipes according to the invention of the Russian Federation No. 2278769, IPC V23K 7/00, s. 2004.08.03, op.2006.06.27 - prototype.

The prototype device is a base, a trolley mounted on rails mounted on the base with a pair of drive wheels mounted on the shafts and a rack rigidly mounted on it, on which the cutter, drives for longitudinal movement of the trolley and the rotation of the cutter are mounted, as well as skew

carts and the possibility of slipping its running wheels along the guide rails.

The design of the device is intended for thermal cutting of large diameter non-rotary pipes on pipe welding units and allows sequential cutting of grooves in the pipe with one cutter during the reciprocating movement of the cart along the base rails erected in the production room. At the end of cutting the last groove by turning the cutter 360 degrees, transverse cutting of the pipe parts is carried out. For subsequent pieces of parts, the pipe is fed to the cutter and the sequential cutting process is repeated. Moreover, before starting cutting, the axis of the pipe to be processed must be combined with the axis of rotation of the torch, which cannot be done in the field, just as it is problematic and inefficient to erect a base with rails parallel to a stationary pipeline. The known device with one cutter, unproductive due to idle passes of the cart and the need for auxiliary operations to install the pipe and move it to the cutter for subsequent cutting sections, and also quite cumbersome and metal-intensive. The low reliability of the device is due to the presence of intermediate links from the trolley to the cutter and the latter in constant on-off modes.

The task underlying the utility model is to create a compact and reliable device providing a high producer of continuous pipe cutting from one installation while expanding technological and operational capabilities.

The problem is solved in that the device for thermal cutting of large diameter pipes, including a trolley with wheels mounted on the shafts, on which the cutter is mounted with the possibility of changing position, and drives for longitudinal movement of the trolley and

turning the torch, according to the utility model, the trolley is equipped with a rotary flange, additionally equipped with at least one cutter, and the wheels are placed on the trolley with the possibility of interaction with the inner surface of the pipe. To align the axis of the rotary flange with the axis of the truck and center the truck inside the pipe, between the drive pair of wheels of the truck, a central steering wheel is installed on its other end, in the same plane with which a pair of clamping wheels and current collector rollers are opposite, which are connected by a linkage and mounted with the possibility of radial movement by means of a pneumatic cylinder or other actuator. To prevent damage to structural elements and cable-hose packages of the device from falling off the detachable pipe parts, the rotary flange is made in the form of a protective casing, inside of which cutters are installed at equal distances from each other with the possibility of radial movement, and is equipped with a peripheral tubular screen. A rotary flange with cutters is installed on an insulating cable-hose package of drives for longitudinal movement of the truck and pressure wheels of the central tubular element of the truck, which is passed through the tubular screen of the protective casing. The device allows gas, arc and plasma cutting, and the most optimal is air-plasma cutting. Therefore, to achieve the highest cutting speeds, the cutters are made in the form of plasmatrons, which are equipped with ball bearings installed with the possibility of contacting with the inner surface of the pipe, which provide the necessary clearance between the nozzles of the plasma torch and the pipe.

The essence of the utility model is illustrated by an example of a device with five plasmatrons and accompanying drawings, which depict:

figure 1 - General view of the device;

figure 2 is a side view of the device along arrow A in figure 1.

The device comprises a trolley 1 having a pair of driving wheels 2 with a gear motor 3 for longitudinal movement of the trolley 1 and a central steering wheel 4, in the same plane with which two pinch wheels 5 and current collector rollers 6 are connected by a linkage 7 with a drive cylinder. On the trolley 1, a central pipe 8 with a rotation motor gear 9 is installed, inside which a cable-hose package 10 is laid, and a rotary flange 11 in the form of a protective casing is installed on its console. Five plasma torches 13 are mounted in the flange 11 at an equal distance from each other by means of radial movement mechanisms 12, on each nozzle of which a ball bearing 14 of free movement is fixed. A peripheral tubular screen 15 is fixed on the flange 11, inside which a central pipe 8 and a cable-hose package 16 of the plasma torches are placed.

The device operates as follows.

The trolley 1 from the side of the steering wheel 4 is led into the cut pipe, the operator includes a gear motor 3, which moves the trolley along the smooth and clean inner surface of the pipe in a smooth and uniform mode to the point of contact of the ball bearings 14 of the plasma torch nozzles 13 of the pipe edge. In this case, the device is self-centered in the tube by the wheels of the trolley, and ball bearings 14 provide the necessary clearance (3-5 mm.) Between the nozzles of the plasma torches 13 and the tube. Then the operator simultaneously includes the supply of the working medium to the plasma torches 13 and the geared motor 3 of the longitudinal movement of the truck 1 into the pipe. Five longitudinal cuts are made and when

the length of the grooves of the pipe will reach a predetermined size, for example, for scrap metal in accordance with GOST 2787-75 for grade 3A - 500 mm., automatically according to the established program, the gear motor 3 is turned off and the gear motor 9 turns the flange 11 clockwise through an angle of 75 ° for exclusion of metal cuts. The cut pipe segments fall to the ground, and at the end of the rotation of the flange 11, the gear motor 9 is turned off and the gear motor 3 is turned on. The following longitudinal cuts are made, the flange 11 is turned counterclockwise, and then the technological cycle is repeated in automatic continuous mode according to the specified program.

A simple, reliable and high-performance device for thermal cutting of large-diameter pipes, providing non-stop cutting, has wide operational capabilities. Especially relevant is its use in the field (tundra, desert, steppe) when dismantling gas pipelines for continuous automatic cutting of high-quality scrap metal. Its use allows to reduce the dismantling time with increasing plasmatron resource, reduce the number of maintenance personnel and facilitate their work, as well as reduce transportation costs and the number of related machines and mechanisms per unit of production.

Claims (5)

1. A device for thermal cutting of pipes of large diameter, including a cart with wheels mounted on the shafts, a bearing cutter mounted with the possibility of changing position, and drives for longitudinal movement of the cart and turning the torch, characterized in that the cart is equipped with a rotary flange, optionally equipped with at least , with one cutter, and the wheels are placed on the cart with the possibility of interaction with the inner surface of the pipe. 2. The device according to claim 1, characterized in that between the drive pair of wheels of the trolley at its other end there is a central steering wheel, in the same plane with which a pair of clamping wheels and current collector rollers are oppositely placed, connected by a lever mechanism with the possibility of radial movement. 3. The device according to claim 1, characterized in that the rotary flange is made in the form of a protective casing mounted on the central tubular element of the trolley, inside of which cutters are mounted at equal distances from each other with the possibility of radial movement. 4. The device according to claim 1, characterized in that the rotary flange is provided with a peripheral tubular screen, inside which the central tubular element of the trolley is missing. 5. The device according to claim 1, characterized in that the cutters are made in the form of plasmatrons, which are equipped with ball bearings installed with the possibility of contacting with the inner surface of the pipe.