RU2337781C1 - Device for pipe distribution - Google Patents

Abstract

FIELD: technological processes; transportation.

SUBSTANCE: case with central axis channel features connection and work parts, and work rollers mounted at an angle to case axis. Work part includes series of two sections, conical support and conical thrust ones. Conical thrust section has larger cone angle than conical support section. Cylindrical grooves serving as supports for work rollers are made at conical support section. Work rollers include cylindrical shaping section and conical thrust gauging section and are located in conical roller holder with axial movement drive.

EFFECT: possibility of pipe section distribution; facilitated input of device into pipe and removal from pipe after distribution, enhanced durability of device.

2 cl, 3 dwg

Description

The invention relates to the field of metal forming, and in particular to tube production.

A device for distributing pipes containing a conical punch mounted on a pull rod (see I.L. Perlin, M.Z. Yermanok. Drawing theory, M., Metallurgy, 1971, p. 76). When pulling the punch through the inner channel of the pipe, an increase in the inner and outer diameter of the pipe (pipe distribution).

The disadvantage of this device is significant axial forces on the traction rod, which can lead to its breakage, the impossibility of distributing a section of a pipe located between two other sections of a smaller diameter, a limited amount of radial deformation (distribution size) due to the unfavorable stress state of the pipe metal, the need to use high-quality lubricants on the inner surface of the pipe, since the friction conditions when pulling the punch are very unfavorable.

A device for distributing pipes (patent WIPO WO 2007/017355 of 02/15/2007) containing a traction rod with an end stop on which two elements are installed that center the distributing element on conical surfaces is known. When traction is applied to the traction rod, two elements act on the distribution element, which leads to an increase in its diameter. When pushing the considered element through the pipe and its distribution occurs.

The disadvantages of this device include the small value of the possible radial distribution of the pipe, the presence of sliding friction between the pipe and the distributing element and the need to use and apply high-quality lubricants, as well as the difficult use of the device under adverse friction conditions.

A device is known for securing pipes in gratings (AS USSR No. 845995, publ. 15.07.81, B.I. No. 26). The device comprises an expandable collet with petals having radial cuts and a conical rod, moreover, the collet petals are made with cuts along the chords, and the cuts along the radii are made perpendicular to the cuts along the chords.

The disadvantage of this device is that the elements of the device itself (the petals of the collet) move inside the device with sliding, which leads to the need for significant efforts on the conical rod. The collet in the open state is jammed in the pipe, which greatly limits the length of the pipe section being distributed to the length of the working section of the device. A device of this type cannot be used to distribute pipes with increased wall thickness and considerable length, which limits its scope.

As a prototype, a device for expanding pipes according to the patent of Russia RU 2.144.128 from 10.01.2000 was adopted. The device comprises a housing with a central channel, coupling and nipple ends for connection and a working part, on which rollers are mounted, mounted on axes inclined with respect to the axis of the housing. The recesses are not supporting parts for the rollers, since there is a gap between these recesses and the roller. The rollers themselves are supported in the axial direction from below on the axis, and from above on the plain bearings and are fixed with pins in the bearing bushes. The rollers are conical in shape.

The disadvantages of the prototype is the lack of adjustment of the radial position of the rollers, which leads to difficulties in feeding the device into the pipe. Despite the rolling on the working surface of the rollers and pipes, the device contains power bearing units with sliding friction. In addition, the roller is supported along the annular end surface, and the sliding friction resulting from this can lead to increased wear of the indicated support unit. The design of the roller does not contain a calibrating belt, which reduces the accuracy of rolling. The device cannot be used when distributing a pipe section located between two other pipe sections of a smaller diameter.

The objective of the invention is to provide a device that provides the distribution of pipe sections located between other sections of smaller diameter, ensuring easy supply of the device to the pipe and its removal after distribution, as well as increasing the durability of the device.

The problem is solved by creating a device for distributing pipes, including a housing having a connecting and working parts and containing a Central axial channel, working rollers mounted at an angle to the axis of the housing.

New in the device is that the working part contains two consecutive sections - a conical support and a conical contact, and the conical contact section has a greater taper angle than the conical support, cylindrical grooves are applied to the conical support section, which are the bearings of the working rollers, the working rollers contain a cylindrical profiling and conical resistant gauge sections and are placed in a conical roller holder equipped with an axial displacement drive.

In addition, it is new that the roller holder drive is made in the form of an annular hydraulic cylinder with a piston mounted coaxially with the device body.

This technical solution allows the axial movement of the rollers from the annular piston coaxially with the housing of the hydraulic cylinder to axially move the conical roller holder, which allows changing the radial dimensions of the device and allows it to be fed to the desired length in the pipe being distributed. This allows you to distribute one or more pipe sections located between other sections of a smaller diameter, i.e. to distribute pipes in any necessary place. This is necessary, for example, when installing transverse partitions in heat exchangers. In addition, since the axial feed of the device is combined with its rotation and during the distribution process it is performed at a small value per revolution of the device, the deformation fraction will be large. This provides increased ductility of the pipe metal and the ability to achieve a large diameter pipe distribution. A hydraulic cylinder is used as an information-breeding drive for the rollers, for which a fluid supply under pressure is used. Such a drive method, unlike some others, does not limit the length of the working column leading the device. The principle of rolling the rollers along the workpiece is used when they are supported on the profile cavities of the housing. The radial fastening of the rollers against displacement under the feed force of the device is carried out on the conical thrust part of the housing. The rollers are placed in a separator, which, however, does not affect the ability of the rollers to move within the stroke.

Since the supporting and persistent conical sections of the device should be made of hardened steel with grinding surfaces, and the rollers can be made of hard alloy (for example, VK6, VK8), the durability of such a contact pair can be very high. An additional increase in the durability of the device is achieved by the fact that the rollers are supported on cylindrical grooves. This dramatically reduces the pressure on the contact of the roller and the support section. In the case where the radius of the roller and the radius of the groove are close to each other, the decrease in contact pressure in the pair is especially significant. Therefore, the device in question has an increased load capacity, which allows its use in the distribution of pipes with increased wall thickness.

On the roller there is a conical section, which in the working position of the roller abuts in order to perceive axial force in the thrust part of the housing. For this purpose, the thrust part of the body is made with a larger (about 45-90 °) taper angle than the support part (15-30 °).

In addition, the persistent conical part of the roller plays the role of a calibrating section during profiling, which allows for increased distribution accuracy. In order for the calibrating section of the rollers to be parallel to the axis of the pipe (with an angle of 0 °), the angles of the supporting and persistent parts of the device casing should be correlated as 1: 2, respectively, i.e., for example, 30 ° for the supporting and 60 ° for the persistent parts.

A section along the axis of the device in the initial (transport) state is shown in FIG. 1, a section along the axis of the device in the working state (during distribution) is shown in FIG. 2; figure 3 shows the cross section of the device aa (figure 2).

The device (figure 1) contains a housing 1 with an axial channel 2. The housing includes a connecting part, consisting of a cylindrical section and a threaded part necessary for connection to the feed rod. The housing also contains a conical part, consisting of two conically arranged conical sections: supporting A and persistent B. Cylindrical grooves are placed on the supporting section A of the conical part (see FIG. 3), which are supports for accommodating the working rollers 3. These working rollers are placed in the roller holder 4. The roller holder 4 contains radial grooves, the length of which is equal to the length of the working rollers 3. The rollers 3 are installed in the roller holder 4 in such a way that their radial movement is possible, but the radially extended maximum position of the rollers 4 is restricted annular body.

At the end of the supporting conical part there is a thread that serves to connect the hydraulic cylinder 5, mounted coaxially with the device body. The hydraulic cylinder contains an axial channel 6, which is a continuation of the axial channel 2 of the housing, as well as radial channels, and formed by the inner body and the outer removable cup of the annular working cavity of the hydraulic cylinder 7. In the cylinder there is an annular piston 8 attached to the conical roller holder 4.

The operation of the device is as follows. The housing of the device 1 is fixed by means of a thread on the feed column. The column with the device in the position shown in figure 1 (the rollers are reduced) is fed into the pipe to the area requiring rolling. Then, liquid under pressure is supplied to the central channel of the device 2. Under its action, the annular piston of the hydraulic cylinder 8 extends from the cylinder 7, shifting the conical roller holder 4 with the working rollers 3 installed therein to the position shown in FIG. 2. The rollers 3, moving along the conical part of the device A, are bent in the radial direction, pressing into the rolling pipe. The final axial position of the rollers 3 is an abutment against the thrust conical part of the housing B. The column rotation drive is turned on, and the device starts by rotating to feed in the direction of the working axial feed, indicated by the arrow in FIG. 2. After the required length of the pipe is dispensed, the rotation drive is turned off, the fluid pressure is reduced, and the device is removed in the opposite direction to the working feed of the device. The rollers 3 at the same time, resting on the non-profiled part of the pipe, are removed in the transport position and do not interfere with the removal of the device. To exclude the rotation of the rollers 3 along the support cone A and to reduce the pressure at the “roller – support cone” contact, grooves are provided having a roller profile, the shape and arrangement of which are illustrated in FIG. 3.

Claims (2)

1. A device for distributing pipes, comprising a housing with a central axial channel having a connecting and working parts, working rollers mounted at an angle to the axis of the housing, characterized in that the working part of the housing is made with conical supporting and conical stop sections, conical stop the section has a taper angle larger than the conical supporting section, which is made with parallel cylindrical grooves serving as bearings for the working rollers, and the working roles ki are made with a cylindrical profiling and conical resistant gauge sections and placed in a conical roller holder having a drive of its axial movement. 2. The device according to claim 1, characterized in that the axial movement of the roller holder is made in the form of an annular hydraulic cylinder with a piston mounted coaxially with the device body.

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