RU51361U1 - DEVICE FOR SHAPED PIPE CUTTING - Google Patents

Abstract

The utility model relates to the field of production of pipe fittings by means of fire cutting and welding of its workpieces and can be used for the manufacture, for example, of branch pipes for tees of gas and oil pipelines. The purpose of the utility model is to improve the quality of processing due to the configuration of the cut, as close as possible to the theoretical one, to reduce the cost of cutting due to the exclusion of many copiers in the manufacture of tees with a wide range and to reduce overall dimensions. The device contains a carriage (3) mounted on a common frame (1), a drive (11), two cranks (16) and (17) with rulers (20) and (21), two wings (5) and (15). To obtain a high-quality cut, the initial parameters are set aside on the rulers - any radius of the tee pipe and any radius of its shell. When the drive (11) is turned on, the said cranks rotate by moving the slider (24) along the guide, thereby realizing the trigonometric function corresponding to the theoretical configuration of the cut. Due to the presence of the chain hoist, there is no need to run the rulers (20) and (21) along the length equal to the radii of the nozzles and shells, which reduces the dimensions of the device. Using the device and removing the slider (24), the rocker (15) and the crank (17), it is possible to obliquely cut the pipe of any diameter, at any angle

Description

The utility model relates to the field of production of pipe fittings by means of fire cutting and welding of its billets and can be used for the manufacture, for example, of tee pipes for gas and oil pipelines.

A device is known for shaped cutting of pipes [1], comprising, mounted on a frame, a tube rotation unit and a mechanism for reciprocating movement of the carriage with a cutter in the form of mounted on support posts, with the possibility of tilting, a rotary disk and a pusher, as well as a disk rotation mechanism in the form of a telescopic shaft pivotally connected at one end to the disk and the other to the pipe being machined, the device being provided with a bar with clamps for attaching it to the pipe being machined mounted on the telescopic shaft, and the shaft oedinen the disc and the rod by means of universal joints.

A disadvantage of the known device is the limited range of products processed on it, because the design offers processing only oblique cut of the pipe, which limits its technological capabilities.

The closest in technical essence and the achieved result to the proposed solution is a device for shaped cutting of pipes [2] (prototype), containing a frame with guides, a carriage with a cutter mounted on it and installed in the guides with the possibility of reciprocating movement from the drive, including copy element and traction, one end of which is kinematically connected with the copy element, and the other with the carriage, a pipe rotation drive with a drive shaft, a pipe clamping unit and an intermediate shaft articulated with it drive

pipe rotation, and is made in the form of a cylindrical drum with a closed groove on its outer surface, the plane of symmetry of which is arranged at an angle to the longitudinal axis of the drum, conjugated along one of the side walls in its diametrically opposite sections with an additional groove, the plane of symmetry of which is inclined to the longitudinal axis the drum at the same angle as the plane of symmetry of the main groove is equipped with a pair of removable liners installed by means of fasteners along the mating sides of the main and Of the additional grooves, the kinematic connection unit of the thrust with the copier element is made in the form of a link pivotally mounted on the frame, a roller mounted on one end of the link with the possibility of interaction with the grooves of the cylindrical drum, a cracker mounted on its other end with the possibility of adjusting movement along it, while the free end of the said rod is pivotally connected to the cracker, and on the wings the measuring ruler is made to adjust the position of the cracker.

A disadvantage of the known device is the fact that its design allows you to get only an approximate configuration of the cut pipe. So, the presence of removable liners and the configuration of the groove of the copy drum determines the cut of the nozzle with a tip at its top, which can only be with equal-bore tees. For unequal tees, the transition line is smooth and is constructed according to certain laws (see above). In addition, when constructing the theoretical profile of the cut, the thickness of the pipe wall is taken into account, the value of which can have a variety of values. These factors allow us to conclude about the low quality of the cut (or the impossibility of implementation) in terms of its accurate construction, as close as possible to theoretical.

It is known that the nomenclature of tees in terms of the combination of shell diameters and nozzles is very wide (for example, 57 × 57, 159 × 86, 325 × 189, 1220 × 530, 1420 × 325, etc.), and the number of these combinations can reach the values of the second order. In the known device for almost every pipe, with a certain diameter, a separate copy drum with the same diameter is required. The drum is very difficult to manufacture and laborious. These arguments indicate an increase in the cost of processing the pipes in the manufacture of tees of a wide range.

The maximum diameter of the tee shell used in gas and oil pipelines is 1420 mm. Therefore, the span of the entire wings of the known device when processing the pipe for such a shell must reach an appropriate value, and therefore the dimensions of the device unreasonably increase.

The purpose of the utility model is to improve the quality of product processing by performing a cut configuration that is as close as possible to the theoretical one, reducing the cost of cutting, by eliminating the use of multiple copiers in the manufacture of tees with a wide range and reducing the overall dimensions of the device.

This goal is achieved in that a device for shaped cutting of pipes, mainly tee pipes, containing a frame with guides, a carriage with a cutter mounted on it and mounted with the possibility of reciprocating movement along the guides, a link, interconnected with a roller, a traction body, one end of which kinematically connected with the carriage, and the other with the link, the tube clamping unit, its rotation drive with the drive shaft and a measuring ruler, further comprises a link, two cranks, two rollers and a measuring ruler, that both the wings are mounted for reciprocating movement,

the main link is kinematically connected through the traction unit to the carriage by means of a slide installed in the guides, on which the said link is fixed in such a way that its working surfaces are perpendicular to the working surfaces of the slide, the measuring rulers are mounted on cranks, the additional link is mounted on the guide and kinematically connected to the cranks by additional rollers mounted on these cranks with the ability to move along the rulers and fixation, and the first crank n is fixed on the drive shaft, and the second in the support mounted on the bed, the main roller is interconnected with the working surfaces of the main link and mounted on the second crank coaxially with the additional roller, means are installed on the bed for fixing the traction member, and the slider is connected to the carriage by means of an increased the stroke of the output link, for example, a chain hoist, while the slider and the additional link contain places for mounting additional means of securing the traction body, and the support of the second crank is installed in zmozhnostyu axial movement of the slider along the guide.

The essence of the utility model is illustrated by drawings, where:

figure 1 - shows a General view of the device

figure 2 - the same view in plan

figure 3 is a section aa in figure 2

figure 4 is a section bB in figure 2

figure 5 - additional scenes with placed on it additional means for attaching the traction body

figure 6 - design of the section of the tap with an oblique cut

figure 7 - construction of a tee

on Fig - scan pipe tee

Figures 9 and 10 are diagrams explaining the principles for constructing a sweep of the pipe.

The device for shaped cutting of pipes contains a frame 1 with guides 2, a carriage 3 with a cutter 4 mounted on it, a link 5, interconnected with a roller 6 (Fig. 3), a traction body 7 made in the form of a cable, one end of which is connected to the carriage 3 by , for example, a bolt 8, a clamping unit 9 of a pipe 10, for example a three-jaw chuck, a rotational drive 11 of the latter with a drive shaft 12. A counterweight 13 serves to tension the traction member 7.

An additional link 15 is mounted on the guide 14, limited from turning around the guide 14 (not shown), kinematically connected to the cranks 16 and 17 by means of rollers 18 and 19 (Fig. 3), which can be moved (and fixed) along the cranks 16 and 17 along the rulers 20 and 21 installed on them, while the lengths of the latter (along the vernier) from the axes of the cranks 16 and 17 are chosen equal to half, respectively, of the maximum radius of the nozzle and the maximum radius of the shell (figure 2). The roller 6 is mounted on the crank 17 coaxially with the roller 19 (figure 3), the crank 16 is mounted on the drive shaft 12, and the crank 17 in the support 22 (figure 1) with the possibility of axial movement of it along the guides 23 (figure 2). The link 5 is fixed motionless on the slider 24 perpendicular to the last (figure 4).

Block 25 is mounted on the slider 24, and block 26 is fixedly mounted on the frame 1, the traction body 7 is fixed on the guide 27 of the slider 24 by means of, for example, an arm 28, envelops the said blocks, forming a chain block and connected through the block 29 to the counterweight 13.

On the additional wings 15 and the slider 24, there are places, for example, threaded holes, for mounting additional means 30 and 31 for fastening the traction member 7.

To understand the principle of operation of the device should consider the method of constructing a sweep of the pipe.

The tee in terms of constructing a theoretical sweep of the pipe is characterized by three parameters (Fig.7).

Dpatr. - pipe diameter

Dobec. - shell diameter

S - pipe wall thickness

The scan in the general case is constructed according to the coordinates X and Y, while the circumference of the pipe is divided by an equal number of parts (in this case, 36). To build the entire scan, it is enough to build its fourth part (Fig. 8).

X coordinate is determined by the formula:

where: n = 10 °, 20 °, 30 ° ... 90 °

The value of Z = Rpat. · Sinα (figure 10)

where α = 10 °, 20 °, 30 ° ... 90 °

or Z = R shell. · sinα

Given the wall thickness of the pipe S, for To (Fig.7) we get:

Then Y = Robec-Robec · cosβ = Ro6ec (1-cosβ) (Fig. 9)

Work on the device as follows. Before starting cutting, the device is adjusted to the desired size (diameter, wall thickness) of the nozzle. Why remove the counterweight 13 s

block 29, and the cranks 16 and 17 are set to the position when the rulers 20 and 21 occupy a horizontal position (figure 2).

Moving the rollers 18 and 19 (together with the roller 6) along the cranks 16 and 17 set the required sizes on the rulers 20 and 21. On line 20 set the size and on the line 21 size . Next, the rollers are fixed.

Example: Tee: Ext. = 1420 mm., Dpatr = 530 mm, S = 16 mm

It is necessary to postpone size 20 on the line: , on the line 21 size: = 355 mm

When moving the roller 19 together with the roller 6, the link 5 with the slider 24 moves freely along the guides of the slider 24, since the counterweight 13 is removed. However, when the said rollers are moved close to the axis of rotation of the crank 17 (small-diameter shell), the roller 19 may become out of engagement with the link 15. If this happens, the support 22 will be released, move it along the guides 23, so that the roller 19 is, approximately, in the center of the axis of the guide 14. Next, the support 22 is fixed relative to the guides 23. The pipe 10 is installed in the cartridge 9 and clamped. The carriage 3 with the cutter 4 is installed in place on the pipe 10 corresponding to the beginning of the cut, the counterweight 13 is mounted in place and the carriage 3 is fixed relative to the traction element 7 by means of a bolt 8.

After adjustment, the flame of the torch 4 is lit, the hole is burned, and by means of the actuator 11, the pipe 10 is rotated, which rotates uniformly to provide the coordinate of the sweep X of the nozzle.

The crank 16, rotating together with the pipe 10 provides through the roller 18 reciprocating movement of the wings 15 (up - down) by (figure 10)

where α is the angle of rotation of the crank 16.

Or (Fig. 4) when the crank 17 is rotated through an angle β at which the slider 24 moves by an amount

Due to the presence of the tackle (in this case, double), the trolley 3 moves an amount twice as large i.e. by 2U, which corresponds to the true value of the coordinate for this branch pipe.

However, when using the tackle, the cut errors due to the drawing of the traction body, the gaps between the wings and the rollers, etc., also double. In this regard, for tees, the diameters of the shells and nozzles of which fit into the dimensions of the rulers, you can not use the chain hoist. To do this, it is enough to reinstall the traction unit from the bracket 27 to an additional means 31 of its fastening. In this case, the movement of the carriage 3 will be equal to the movement of the slider 24, and the errors are minimal. To process sections of bends or squares (oblique cut) (Fig.6) with any angle γ, a slider 24 with guides is removed from the device, a crank 17 with a support 22 and a guide 23, and the traction body 7 is fixed on an additional tool 30 (Fig.5 ), through block 26 (Fig. 4), at the same time, on the ruler 20 of the crank 16, an amount equal to (Fig.6), which corresponds to a given angle γ.

Thus, the inventive device allows shaped cutting of tees, sections of branches of any combination of diameters (even non-standard) pipes, while the configuration of the cut is as close as possible to the theoretical one, which determines the quality of the product, reduces the cost of processing, since there is no need to use a lot of copiers, which difficult and time-consuming to manufacture, the dimensions of the device are reduced by at least two

times, due to the implementation of a gear transmission between the leading and the slave link of the executive bodies of the device.

Sources of information used in preparing the application:

1. Description of the invention to the author's certificate of the USSR No. 793723, class B 23 K 7/04, 1979.

2. Description of the invention to the author's certificate of the USSR No. 1680455, class B 23 K 7/00, 1991

Claims (4)

1. Device for shaped cutting of pipes, mainly tees, containing a frame with guides, a carriage with a cutter mounted on it and mounted with the possibility of reciprocating movement along the guides, a link, interconnected with a roller, a traction member, one end of which is kinematically connected with the carriage and the other with a backstage, a tube clamping unit, its rotation drive with a drive shaft and a measuring ruler, characterized in that the device further comprises a rocker, two cranks, two rollers and a measuring ruler, both wings are mounted with the possibility of reciprocating movement, the main link is kinematically connected through the traction body to the carriage by means of a slide installed in the guides, on which the said link is fixed in such a way that its working surfaces are perpendicular to the working surfaces of the slide, measuring bars are mounted on cranks, an additional the link is mounted on the guide and kinematically connected to the cranks by means of additional rollers mounted on these Ipach with the ability to move along the rulers and fixation, with the first crank mounted on the drive shaft, and the second in the support mounted on the frame, the main roller is interconnected with the working surfaces of the main wings and mounted on the second crank coaxially with the additional roller, and means are installed on the bed to secure the traction body. 2. The device according to claim 1, characterized in that the slider is kinematically connected with the carriage by means of a mechanism for increasing the stroke of the output link, for example, a chain hoist. 3. The device according to claim 1, characterized in that the slider and the additional scenes contain space for mounting additional means of securing the traction body. 4. The device according to claim 1, characterized in that the support of the second crank is mounted with the possibility of axial movement along the guides of the slider.