Metal pipe coil winding tension device

Abstract

The present invention relates to the field of mechanical engineering, in particular to a device for mechanical processing of pipes by pressure, which can be used in coiling heat exchange pipes for heat exchangers in nuclear power plants (nuclear power plants) with predetermined parameters (diameter and winding pitch). A metal pipe coil winding tensioning device, comprising a rotatably mounted replaceable upper roller and two replaceable lower rollers, the upper roller being mounted for vertical movement, the device comprising a longitudinally movable carriage, a body mounted on the carriage and rotatable and fixable about its axis, and a control unit mounted in the body for controlling the longitudinal movement of the carriage according to the angular movement of the spindle shaft at a predetermined winding pitch of the metal pipe, the upper roller and the two lower rollers each being mounted on a tapered roller bearing in the body, each being provided with a number of grooves with a groove-groove center distance L that sets the coil winding density, the upper roller being mounted for vertical movement by means of a slider and an adjustment screw. The distance between the centers of the grooves of each roller is calculated by the following formula: L=D+T, where D represents the outer diameter of the coiled pipe, and T represents the gap between each pipe.

Description

[Technical field]

[0001] The present invention relates to the field of mechanical engineering, in particular to a device for mechanical processing of pipes by pressure, which can be used for coiling heat exchange pipes with given parameters (diameter and winding pitch) for heat exchangers in nuclear power plants (nuclear power plants). Close-packed heat exchangers are widely used in the design of nuclear power plants, but the main problem is the low uniformity and density of the windings. [Background technology]

[0002] Pipe bending devices with fixed spoon-shaped mandrels and dies and special pipe bending machines are known (Handbook of Cold Pressing / Edited by Romanovsky, 6th ed., Leningrad: Publishing House "Mechanical Engineering", 1979, pp. 76-77, Fig. 74a, b, c, d).

[0003] Also known is a tubular heat exchanger coil manufacturing apparatus that includes a fixed headstock and a driven tailstock disposed on a bed, a carriage, a mandrel secured to the headstock and tailstock, and a bending roller.

[0004] The device includes a bending clamping device mounted on a carriage, the body of which is bent toward the movement of the workpiece, a bending roller movably fixed to the lower part of the body at the height of the mandrel, and an additional roller movably fixed to the upper part of the curve of the body (Russian Patent No. 26458, IPC B23F 3 / 04, published December 10, 2002).

[0005] The main disadvantage of known devices and pipe bending installations is that during the bending process the cross section of the pipe is significantly deformed, the outer wall thickness (at the larger radius) decreases and the inner wall thickness (at the smaller radius) increases, and in the case of these thin-walled pipes, wavy folds are also formed.

[0006] The closest technical solution to the problem is an apparatus for winding metal pipes into a coil, which comprises three rollers, the lower roller being provided with two grooves and with a separating flange that determines the winding pitch and angle (Russian Patent No. 2221666, IPC B21D 53 / 06, published 20 January 2004).

[0007] The main disadvantage of this device is that the winding of the pipe on the lathe is carried out with a constant force, which leads to non-circular cross sections, making coiling of thin-walled pipes almost impossible, as well as low productivity of the winding. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Russian Patent No. 26458 [Patent Document 2] Russian Patent No. 2221666 Summary of the Invention [Problem to be solved by the invention]

[0009] The technical problem of the present invention is to increase coiling productivity by batch-wise winding a metal pipe into a coil with given parameters while eliminating cross-sectional deformation. [Means for solving the problem]

[0010] The above-mentioned problems are solved by the following configuration: A metal pipe coil winding tensioning device, comprising a rotatably mounted replaceable upper roller and two replaceable lower rollers, the upper roller being mounted so as to be movable in the vertical direction, the device comprising a carriage movable in the longitudinal direction, a body mounted on the carriage and rotatable and fixable about an axis, and a control unit mounted within the body for controlling the longitudinal movement of the carriage in response to the angular movement of the spindle shaft at a predetermined winding pitch of the metal pipe, the upper roller and the two lower rollers each being mounted on a tapered roller bearing within the body, and provided with a plurality of grooves with a groove-to-groove center distance L that sets the coil winding density, the upper roller being mounted so as to be movable in the vertical direction by a slider and an adjustment screw.

[0011] The distance between the centers of the grooves of each roller is calculated using the following formula:

[0012] L=D+T Here, D represents the outer diameter of the coiled pipe, and T represents the gap between each pipe.

[0013] The device is designed to coil up to eight metal pipes simultaneously.

[0014] The construction of the metal pipe coil tensioning device according to the present invention was devised due to the fact that operating practices, i.e. all known devices and installations for bending metal pipes and in particular for winding metal pipes into coils, have obvious drawbacks, in that bending and winding metal, in particular thin-walled pipes, leads to deformations of the entire pipe and, most importantly, of its cross section.

[0015] The metal pipe coil winding tensioning device uses a multi-grooved roller with a mechanism for determining the winding pitch and angle, which significantly increases coiling productivity and eliminates deformation of the pipe cross section, making it possible to perform coiling within the specified parameters.

[0016] The maximum number of pipes wound simultaneously is 8, which corresponds to the maximum possible number of grooves on the rollers of the roll. This parameter was experimentally determined when coiling thin-walled pipes less than 1000 mm long. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a diagram showing a roll with rollers. [Diagram 2] FIG. 2 shows an end view of the device. [Diagram 3] FIG. 1 is a diagram showing a roll with rollers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The metal pipe coil winding tensioning device comprises a carriage 1 (Fig. 1) on whose bracket a body 3 (Fig. 1) is fixed with removable rollers 5, 6 (Fig. 1) mounted in tapered roller bearings 4 (Fig. 2) on an axis 2 (Fig. 3) necessary for lifting the tensioning device when mounting the pipe. The rollers 5, 6 are provided with a number of grooves.

[0019] The shaft of each lower roller is fixed so as not to move, and the shaft of the upper roller 6 is attached by a screw 8 to a slider 7 which is capable of vertical movement.

[0020] The metal pipe coil tensioning machine works as follows: as the upper roller moves towards the lower roller, the pipe is packed into the roller grooves (micro-bending), increasing the force that advances the pipe, i.e. creating the tension in the pipe required to produce tightly wound heat exchangers.

[0021] A control unit (not shown) is integrated into the carriage body and is designed to automate the process of winding the coiled heat exchanger pipes, implementing a control principle that regulates the longitudinal movement of the machine's carriage according to the angular movement of the spindle shaft, which corresponds to a given winding pitch. The control is performed by an industrial controller that reads information from a rotation speed sensor of the spindle shaft. The information obtained is transmitted to a control rectifier that maintains the optimum rotation speed of the carriage motor.

[0022] The metal pipe coil winding tensioning device allows to expand the technical capabilities of the equipment and to coil and create heat exchangers with a diameter of up to 2800 mm.

[0023] Thus, the device allows to obtain tightly packed bundles of pipes of different diameters and thicknesses, significantly increasing coiling productivity by 1.8-2 times.

Claims

1. A metal pipe coil winding tensioning device, comprising: a rotatably mounted replaceable upper roller and two replaceable lower rollers; The upper roller is mounted so as to be vertically movable; The device comprises a carriage movable in a longitudinal direction, a body attached to the carriage and rotatable about an axis and fixable, and a control unit attached within the body for controlling the longitudinal movement of the carriage in response to an angular movement of a spindle shaft at a predetermined winding pitch of the metal pipe, 1. A metal pipe coil winding tensioning device, comprising: an upper roller and two lower rollers each mounted on a tapered roller bearing within a body and each provided with a plurality of grooves having a distance L between the centers of the grooves that sets the coil winding density; and the upper roller mounted for vertical movement by a slider and an adjustment screw.

2. 2. The metal pipe coil winding tensioning device according to claim 1, wherein the distance between the centers of the grooves of each roller is calculated by the following formula: L = D + T Here, D represents the outer diameter of the coiled pipe, and T represents the gap between each pipe.

3. 2. The metal pipe coil winding tensioning device according to claim 1, characterized in that it is configured to coil up to eight metal pipes at the same time.

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