Machine for cutting shaped pipe sections

Abstract

This utility model relates to the production of pipe fittings using flame cutting and welding of their blanks and can be used to manufacture main gas and oil pipelines. The traction element of the pipe cutting machine, which uses a bevel gearbox mounted on a common shaft with the pipe clamping unit, is sequentially connected via a cam mounting shaft and crimping rollers to a rod supporting the cutter mounting unit. The presence of a rigid traction element in the proposed design eliminates the risk of error when repeating cuts on identical pipe blanks. Reconfiguring the machine for cutting different pipe diameters does not require disassembling any components; simply moving the cup-shaped cam by the required amount and reversing the drive is sufficient. The work is performed on a single machine without additional time or the need for additional installation of new components.Provides the ability to manufacture shaped pipeline parts for joining at turning angles or for joining adjacent pipelines at an angle of 90 degrees. 6 fig.

Description

[0001] The utility model relates to the field of production of pipe fittings by means of flame cutting and welding of its blanks and can be used for the manufacture of, for example, main gas and oil pipelines.

[0002] When installing pipelines for various purposes and in various climatic temperature conditions, it is necessary to manufacture shaped pipeline components for joining at bends or for joining adjacent pipelines at 90-degree angles. Due to climatic conditions, installing pipelines at temperatures as low as -40°C requires the use of a pipe cutting machine capable of withstanding these temperature loads. This type of machine precludes the use of electronic equipment with a CNC unit, as at extremely high or extremely low temperatures, the CNC cannot maintain its functionality and ensure reliable operation of the pipe cutting machine at low sub-zero temperatures and above 25°C.

[0003] Pipe blank cutting devices are known from the prior art, for example, CN108127189, IPC B23D79 / 00, published June 8, 2018, "Adjustable Device for Automatically Cutting Pipe Blanks," according to which the automatic cutting device for an adjustable pipe blank comprises arc-laying plates, anti-slip templates, connecting rods, two cylinders, support rods, a roller, a mounting hole, a base, a cutting knife, a motor, and a connecting shaft. A disadvantage of the known device is the complex design of the device, the difficulty of its use, and the unsuitability of its use for shaped cutting of pipe blanks.

[0004] Also known is a pipe cutting machine (www.metallorukav.su), which allows for straight, beveled, and shaped cuts, while simultaneously beveling for welding. A special tracking system ensures the required precision. A disadvantage of this well-known device is its complex design and difficulty using it in extreme climatic conditions.

[0005] The closest analogue (prototype) is Russian Federation Patent No. 51361 IPC B23K 7 / 00, published February 10, 2006, "Device for Profiled Pipe Cutting," according to which the device comprises a carriage, a drive, two cranks with rulers, and two rocker arms mounted on a common frame. When the drive is engaged, the cranks rotate, moving the slider along a guide, thereby implementing a trigonometric function corresponding to the theoretical cutting configuration. To achieve a high-quality cut, the initial parameters are plotted on the rulers—any radius of the tee branch and any radius of its shell.

[0006] The known design includes a sliding carriage holding a cutter, two cranks, two linkages, a slider, a cable as a traction element, a counterweight that provides cable tension, and a drive unit. The unit operates via the linkages with cranks, to which the cable is rigidly connected, which in turn is secured to the sliding carriage with the slider. A disadvantage of the prototype is that performing a bevel cut requires disassembling some of the equipment (namely, the crank, linkage, and slider), removing the counterweight from the cable, and reinstalling the counterweight after retooling. To cut shaped pipes of different diameters using this design, a template must be individually manufactured and replaced for each pipe.

[0007] The purpose of the utility model is to increase the versatility of the installation for cutting shaped pipe sections, including in extreme climatic conditions.

[0008] The problem is solved by implementing a traction element in the form of a bevel gearbox placed on a common shaft with the pipe clamping unit, sequentially connected through the cam mounting shaft and crimping rollers with a rod on which the cutter mounting unit is fixed.

[0009] The technical result of using the utility model consists in providing the possibility of manufacturing shaped pipeline parts for joining at turning angles or for joining adjacent pipelines at an angle of 90 degrees and performing installation work on pipelines for various purposes and under various climatic temperature conditions.

[0010] The essence of the utility model is that a pipe cutting machine comprises a common frame containing: a torch mount, a traction element connected thereto, a pipe clamping unit in the form of a plan-washer with a rotation drive from the positioner's drive shaft, and a measuring ruler. The machine is equipped with a traction element realized in the form of a bevel gearbox, which is kinematically connected to a cam mount shaft, which is connected to crimping rollers, which, in turn, are kinematically connected to a rod. A torch mount is secured to the rod, positioned on the frame so that the torch can engage a lead screw equipped with a ruler and a handwheel for its rotation. By mechanically transmitting the rotation of the tubular blank and the linear movement of the plasma cutter, coordinated with it, using a cam, through the crimping rollers and the rod carrying the cutting unit, secured to the extension, the cutting of the shaped tubular blank is carried out.The coordinated angular rotation of the pipe blank secured to the clamping unit's wafer with the torch's linear movement ensures the required shaped pipe blank is cut with a 360-degree rotation. To cut shaped pipe components for pipe joints at a 90-degree angle, the manipulator drive must be reversed every 90 degrees of rotation of the control cam, in accordance with the plasma torch's movement pattern. A distinctive feature of the shaped pipe cutting system is that it utilizes a commercially available rotary unit (KV-300 or similar equipment), a bevel gearbox, a cup-shaped cam, and a rigid rod to which the torch is attached as the sole drive. The rigid rod in the proposed design eliminates the possibility of error when repeating cuts on identical pipe blanks.When reconfiguring the machine for cutting pipes of other diameters, there is no need to dismantle any components or parts. Simply move the cup-shaped cam to the required position and reverse the drive using a push-button remote control with an extended cable. Thus, all work is performed on a single machine, without additional time costs or the need to install new elements.

[0011] The essence of the utility model is explained by graphic materials

[0012] Fig. 1 shows a general diagram of the installation.

[0013] Fig. 2 shows a cup-shaped cam in section.

[0014] Fig. 3 is a graphical representation of the change in the radius value when the cam rotation center changes from position 0 to position 1.

[0015] Fig. 4 shows a graph of the cutter movement when the positioner faceplate rotates 360 degrees.

[0016] Fig. 5 shows a graph of the cutter movement when cutting a shaped blank for installation at 90 degrees.

[0017] Fig. 6 shows the control points of the cutter movement along the pipe blank during the production of a shaped blank for joining with a pipeline at 90 degrees, according to the graph in Fig. 5.

[0018] An example of a specific installation for cutting shaped pipe sections.

[0019] The installation for cutting tubular shaped blanks comprises a common frame 1, on which a KV-300 welding positioner is fixed with a control unit for the rotation speed of the clamping unit for the tubular blank in the form of a plan washer 2 with a drive for its rotation 3 from the driving shaft 4 (Fig. 1). Also fixed on the frame, connected to the driving shaft 4, is a traction element made in the form of a bevel gear 5 with a gear ratio i = 1, kinematically connected to the shaft 6, on which a cam 7 is located. The cam 7 is a cup-shaped product with a rectangular hole along the diameter with rulers applied to its body - marks for setting it in a given position (Figs. 2, 3). On the cam body, there are crimping rollers 8, which, in turn, are kinematically connected to the rod 9.On the rod 9 there is a mounting unit for the cutter 10, with an extension 11 made from a square tube of telescopic design, and a plasma or gas cutter 12, which has a mechanical and kinematic connection with the lead screw 13, fixed on the rod 9. The lead screw 13 is equipped with a ruler 14, for controlling the magnitude of the linear movement of the plasma or gas cutter and a handwheel 15 for rotating the lead screw 13 (Fig. 1).

[0020] The installation works as follows.

[0021] A welding positioner KV-300 with a control unit for the rotation speed of the faceplate 2 is mounted on frame 1 of the installation. From the positioner drive 3, rotation is transmitted, through the common shaft 4, to the faceplate 2 and to the bevel gear 5 (Fig. 1). The rotation from the bevel gear 5 is transmitted through the rotation shaft 6 to the cam 7. When the cam 7, installed with the required offset of the cam rotation axis (Fig. 2, 3), rotates, the force is transmitted to the crimping rollers 8, which, rolling along the cam 7, provide a linear movement of the rod 9, which forces the plasma cutter mounting unit 10 to move together with the rod 9, together with the extension 11 and the plasma cutter 12 parallel to the axis of the tubular blank 3. The coordinated linear movement of the plasma cutter 12 with the angular rotation of the tubular blank 3 allows for one 360-degree revolution of the tubular blank 3 and one 360-degree revolution of the cam 7 to cut out the shaped part of the tubular blank required for the installation of the pipeline.

[0022] To perform a repeat (next) cut of a shaped part, the plasma cutter 12 is moved by the operator to the required value by rotating the lead screw 13. The amount of movement of the plasma cutter is controlled using the ruler 14 (Fig. 1). When cutting simple cylindrical workpieces, cam 7 is set to the zero position at point "O" (Fig. 3).

[0023] When cam 7 rotates and tubular blanks 3 rotate, cutting torch 12 moves along a curve (Fig. 3). The operator shifts the cam from axis 0 to 1 to obtain a shaped blank with the required specified angle in a specific situation. The cutting torch's trajectory during cam rotation and changes in the linear radius value, which allows cutting the shaped blank in accordance with the trajectory shown in the graph (Fig. 4). By setting plasma cutter 12 at the required angle to the longitudinal axis of rotation of tubular blank 3, chamfering is ensured. To cut shaped tubular products required for joining pipelines at an angle of 90 degrees, the operator of the installation performs reverse switching of the KV-300 positioner drive every 90 degrees of rotation of the setting cam 7, in accordance with the movement schedule of the plasma cutter 12 (Fig. 6).To perform the reversing switching of the drive positioner, the operator of the installation uses a push-button reversing control panel on an extended cable (not shown in the Fig.), placed in a flexible corrugated pipe, allowing it to work at any point of the installation. To set the cam 7 in the desired position with the center of rotation "O1" (Fig. 3), a mark is applied to cam 7 for visual control. In the graph (Fig. 4), the cam rotation angle α is indicated along the abscissa axis. The multiple of the rotation angle α is equal to 45°. (The angle α is indicated in Fig. 3). When rotating the cam with the center of the axis 0 1, the radii are shown from R1, equal to 440 mm, to R8, equal to 360 mm, with an angle α of rotation of 315°. When installing the cam with the center of rotation R1 is equal to 440 mm. When the cam rotates through an angle α of 45°, R2 equals 360 mm. When the cam rotates through an angle α of 90°, R3 equals 232 mm. When the cam rotates through an angle α of 135°, R4 equals 150 mm. When the cam rotates through an angle α of 180°, R5 equals 120 mm. When the cam rotates through an angle α of 225°, R6 equals 160 mm.When the cam rotates by an angle α of 270°, R7 is equal to 232 mm. When the cam rotates by an angle α of 315°, R8 is equal to 360 mm. With further rotation of the cam, the angle α is equal to 45°, the cam makes a full revolution of 360°, with a radius 1 equal to 440 mm. When the cam rotates by an angle α of 360°, R1 is equal to 440 mm. Thus, changing the radius value from R1 - R8-R1, the cam makes a revolution of 360°. Changing the lengths of the radii ensures linear movement of the cutter 12 along the axis of the pipe blank. Designation Ω in Fig. 3 indicates the direction of rotation of the cam 7. Rotation of the cam is possible in any direction: both clockwise and counterclockwise. R0, equal to 280 mm in Fig. 3 is the cam manufacturing radius, the design radius, which is specified directly during its manufacture.

[0024] The unit enables cutting of shaped pipe blanks from pipes with diameters from 50 mm to 500 mm and weighing up to 300 kg.

[0025] This pipe cutting machine can be installed at any construction site, including in the field. It can operate in any climate and temperature conditions, including extreme ones.

[0026] Thus, the problem facing the utility model has been solved.

Claims

An installation for cutting shaped pipe sections, comprising a frame carrying a cutting torch fastening unit, a traction member connected thereto, a pipe clamping unit with a drive for its rotation from a drive shaft and a measuring ruler, characterized in that the traction member is made in the form of a bevel gearbox placed on a common drive shaft with the pipe clamping and rotation unit, wherein the bevel gearbox is connected to a cam rotation shaft on which crimping rollers are placed, which in turn are kinematically connected to a rod on which a plasma cutting torch fastening unit is mounted, placed on a telescopic extension with the possibility of contact with a lead screw fixed to the frame, equipped with a ruler and a handwheel for its rotation.

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