SU1696271A1 - Device for machining of pipe ends - Google Patents

Abstract

The invention relates to ancillary equipment and is used for grinding, deburring from the ends of pipes, mainly for butt welding, and can be used in all areas of the national economy. The purpose of the invention is to improve the quality of processing. To achieve this goal, the centering assembly rod 3 is located by means of a bearing assembly in an additional cavity of the hollow cone 1, in which also stop 17 is concentric with the main 10 and additional 11 housing cavities. The expansion clamp is located in the housing of the centering unit, in which the cuts are made, and the cutting elements 2 spring loaded. 2 yl

Description

The invention relates to ancillary equipment and is used for grinding, deburring from the ends of pipes, mainly for butt welding, and can be used in all areas of the national economy. The invention can be used to process the ends of large diameter pipes, while it is mounted on the machine spindle. It can also be used to process pipes of small diameters (up to 100 mm), for this it can be made in the form of a portable handheld device that is convenient to use in mounting conditions

The purpose of the invention is to improve the quality of processing.

FIG. 1 shows a device for processing pipe ends (in section); FIG. 2 shows the operating position of the device, the engine is turned on, and the processing is performed on the maximum width of the treated strip.

The device consists of a drive motor (not shown), a hollow cylindrical body 1, cutting elements 2 (there must be at least three of them, placed at equal angular distances from each other) of abrasive material and a centering unit. The centering unit consists of a rod 3 with an expansion clamp on the working end, which is made in the form of a conical pusher 4. The expansion clamp consists of locking elements 5, a clamp body 6 and a hollow threaded plug 7. The cutting elements 2 are placed radially in the housing cavity 1. They can move in a plane perpendicular to the axis of the stem 3 using a spring 8 and a special stop screw 9. The housing 1 consists of a main C-shaped cavity 10, an additional stepped cavity 11 and two angular contact bearings 12 installed between the steps of the additional cavity 11 Free end of the stem

with

ke 3 is passed through the bores of the bearings 12 and is provided with an anvil ring 13, which is put on the bearing 14 mounted on the stud 15. The bearings 12 are separated by a spacer sleeve 16.

The housing 1 is also provided with a stop 17, a concentric main, additional cavity and a stem. The stop 17 is made in the form of a stepped cylinder, on which another radial-stop bearing 18 is mounted, on which a non-metallic contact ring 19 is mounted.

In addition, the device is provided with sealing rings 20 (in the main cavity 10), as well as a sealing ring 21 and a retaining spring ring 22 (in the additional cavity 11).

The operation of the device can be divided into three stages.

The first is bringing the device into position, preparing for processing the end of the pipe. To do this, a centering unit is inserted inside the pipe, consisting of a stem 3, a conical pusher 4, which, together with the case 6 of the retainer, the locking elements 5 (at least three spaced apart from each other at equal angular distances x) and the stopper 7 forms centralizer clamp. In this case the centering unit is in an inoperative position, the fixing elements 5 are in a compressed state. The free end of the rod 3, which is located in the additional cavity 11 and consists of the spike 15 with the bearing 14 pressed in on it and the thrust ring 13 which is mounted on this bearing, is an on / off unit for the centralizer / retainer.

The device is in an idle position (FIG. 1). The housing 1 at this moment is located so that the cutting elements 2 are in a state of contact with the pipe being machined (Fig. 1).

After that, the body 1 is moved in the direction of the pipe being processed, the cutting elements 2 are put on the pipe in the same way. that the rear edge of element 2 coincides with the edge of the pipe or minimally stands for it. This is the initial position of the device, it is ready to work, but still does not work. With this position of the housing 1 with the cutting elements 2, the bottom of the additional cavity 11 comes into tangential contact with the stop ring 13.

Upon further movement of the housing 1 towards the machined pipe, the bottom of the additional cavity 11 presses against the anvil ring 13. This triggers the centering unit to operate by expanding the locking elements 5 with a conical pusher 4. The cutting elements 2 at this moment are set in the extreme working position (i.e. they are allocated to the maximum width of processing). The rotational motor is still not engaged. This completes the first preliminary stage of bringing the device into position.

The second stage - direct processing of the end of the pipe. To do this, turn on the engine. The housing 1 is retracted so that the cutting elements 2 fall into their initial position for processing (see FIG. 2). The latch does not unlock, so

as the rod 3 has the possibility of free movement inside the bearing assembly within the working stroke of the device. When reciprocating, when the cutting elements 2 move a plurality of times from the initial working position to the limiting one, the ribbon is processed at the end of the pipe. Used abrasive material and removed

the waste metal layer accumulates in the cavity 10.

The third stage - the withdrawal of the device from the processed product. After completion of the treatment, the rotational movement is switched off. The housing 1 is retracted, the cutting elements 2 are on the pipe (Fig. 2), the bearing 12 comes into contact with the bearing 14 and, pressing it, unlocks the expansion clamp.

Subsequently, slag is removed from cavity 10. At this point, the processing of this part is completed.

In order to ensure synchronism of the centering unit and the body 1 in the manufacture of the device, it is necessary to take into account that the working surface of the stop 17 must be placed from the outer edge of the cutting element 2 at a distance (or not less) of a given width of treatment, and

the length of the additional cavity 11 must be greater than the specified width of treatment by an amount that provides a clamp with a lock.

The proposed device for processing hollow articles allows obtaining high processing quality due to repeated passage of cutting elements at the processing site and by reducing

the difference in thickness of the hollow cylindrical product being processed and, consequently, to subsequently obtain a high quality weld. In addition, machining accuracy is improved by

clamp sliding, interacting on the inner surface of the hollow product.

F o rumlula and z o breetn

A device for processing pipe ends, comprising a hollow body disposed on a drive shaft, carrying abrasive cutting elements, a centering unit made in the form of a rod with a conical working element and an expansion clamp disposed on it, which distinguishes

In order to improve the quality, an additional cavity is made in the housing in which the bearing assembly inserted into the device for positioning the rod and the stop concentric with the main and additional cavities are located, while the centering assembly is provided with a slotted housing , and the expansion clamp is placed 6 mentioned slots, and the cutting elements are placed in the housing by means of springs introduced into the device.

15

H

15№

sixteen

eight

13

FIG. 2

Claims (1)

Claim A device for treating pipe ends, comprising a hollow housing located on the drive shaft that carries abrasive cutting elements, a centering unit made in the form of a rod with a conical working element and an expandable clamp placed on it, characterized in that, in order to improve the quality, an additional cavity is made in the housing, in which there is a bearing assembly inserted into the device, designed to accommodate the rod, and an emphasis placed concentrically to the main and additional cavities, while the center assembly The machine is provided with a housing with slots, and an expandable retainer is located 6 mentioned slots, and the cutting elements are placed in the housing by means of springs introduced into the device. Figure 2 Compiled by N. Finn Editor E. Khorina Tehred M. Morgenthal Corrector M. Kucheryavaya Order 4266 Circulation Subscription VNIIIPI of the State Committee for Inventions and Discoveries at the State Committee for Science and Technology 113035. Moscow, Zh-35. Raushskaya nab., 4/5 Production and Publishing Combine Patent, Uzhgorod, 101 Gagarin St.