SU1646639A1 - Device for removal of holder from the tube - Google Patents

Abstract

The invention relates to continuous pipe-wiping production, in which the drawing, running-in and removal of the pipe from the mandrel can be combined, and the drawing and running-in operations with the extraction of the mandrel are made separately. The purpose of the invention is to increase productivity. Rotate the yoke 6 with the adjusting screws 3 fixed in its side wall 9 with offset and give the squeezed tool in the form of a ring 2 with an internal convex surface a rocking motion. By acting alternately with different parts of the ring on the pipe 19 and deforming it, a gap is formed to remove the mandrel 18 from the pipe. 5 il. Ј in O la o o o u u

Description

The invention relates to continuous pipe-wiping production, in which the operations of drawing, running in and removing the pipe from the mandrel can be combined, and the operations of drawing and running in with the extraction of the mandrel are made separately.

The purpose of the invention is to increase productivity.

FIG. 1 shows the proposed device, a general view: in FIG. 2 - ring in two positions (I-I - tilting the ring to the left, II-II - tilting the ring to the right); in fig. 3 shows section A-A in FIG. one; in fig. 4 shows a section BB in FIG. 2; in fig. 5 shows a section B-B in FIG. 1. A device for extracting a mandrel from a pipe comprises a housing 1, a centering tool in the form of a ring 2 centrally disposed therein, parallel adjustment screws 3, a pulling mechanism 4, a pipe locking mechanism 5 from longitudinal movement, a drive ring 6 mounted in a housing on the radial bearings 7 and the thrust bearing 8. in the side wall 9 of which the ends of the adjusting screws are fixed, and the ring has an internal convex surface, is mounted in the housing on the spherical bearing 10 and interacts with The fingers of the adjusting screws through the thrust bearing 11. The ends of the screws of the same name are set offset e relative to each other. Due to the displacement of the ends of the adjusting screws, the axis of the ring is inclined relative to the axis of the drive holder at an angle a. For fixing the ring, there are two .add. To the adjusting screws 12, mounted in the side wall of the drive holder. The drive cage is made in the form of V-shaped belts 13. pulley 14 and electric motor 15. The mechanism for fixing the pipe from longitudinal movement consists of grippers 16 moved by pneumatic cylinders 17.

The device works as follows.

To remove the mandrel 18 from the pipe 19, the axis of the ring 2 is set at an angle "relative to the longitudinal axis of the housing 1 by manually rotating the adjustment screws

3 relative to the side wall. These screws, interacting through the thrust bearing 11 with a deforming rolling ring, tilt it. In doing so, the balls of the bearing 11 roll over in the inner surface of its outer ring. Then zchdy t in the direction of the driving mechanism

With a free end, a mandrel with an oak and a pulling mechanism 4 engages this end.

the mandrel, resulting in the mandrel with the pipe moves progressively and at the approach of the front end of the pipe to the ring include the electric motor 15. From the electric motor

rotation is transmitted through the pulley 14, the V-shaped belts 13 of the drive holder 6, and together with the latter and the adjusting screws 3, the ends of which through the thrust bearing 11 act on the ring. Ring

makes a swinging movement relative to the center of swing 0. When the pipe is moving longitudinally, the ring, swinging, acts alternately with different parts of its internal convex surface on

pipe and compresses its wall on the mandrel. Here, gaps D h and D b are formed between the inner surface of the pipe and the mandrel. In one cycle of complete swinging movement of the ring (one turn of the drive holder 6), the pipe will be deformed over the length (total

With further longitudinal movement of the mandrel with the tube, the latter is subjected to deformation over the sections and throughout

length, consistently freeing the pipe from the mandrel.

After the deformation of the pipe is completed, the electric motor 15 is turned off and the front end of the pipe with the driving mechanism 4 is brought to the position of the grippers 16 of the fixing elements. At this time, the pneumatic cylinders 17 deliver air and move the grippers 16 towards each other until it comes in contact with the front end of the pipe.

and. thus, it is kept about g further longitudinal movement.

The mandrel is pulled out of the pipe by the lifting mechanism 4 and after completing this operation the pipe is dropped into the pocket (not

is shown), and the mandrel is returned to the drag line and all operations are repeated.

Example. A run-in and removal of the pipe from the mandrel is carried out. Carbon steel 0 22 x 1.0 mm pipes are machined and

0 22 x 1.5 mm, length 2.5 mm in the amount of 30 pieces of each size. The time spent on installing the deforming ring is fixed at an angle a, which is 3 minutes. The outer diameter of the finished pipes is also measured with a micrometer and its deviation is determined, which is 0.03-0.04 mm. A visual inspection of the finished pipes found that the quality of their surface is good.

5Thus, a batch of pipes of the same size is processed on a known device. At the same time, the time spent on setting the rollers in the required position is 15 minutes.

As a result of a visual inspection of the pipes, it was determined that there is a facet on their surface. Deviations in pipe diameter are 0.05-0.1 mm.

The proposed device for extracting a mandrel from a pipe allows a reduction in the time required for adjustment when changing to a different pipe size by 5 times. Productivity increases by 15-20%. Along with this, the surface quality of the pipes obtained on this device is characterized by the absence of facets and less than two or three times about the deviation in diameter.

Claims (1)

Invention Formula A device for extracting a mandrel from a pipe, comprising a housing, centrally 0 A rolling tool placed in it with parallel located adjusting screws, a pulling mechanism and a mechanism for fixing the pipe from longitudinal movement, characterized in that, in order to increase productivity, it is equipped with a drive ring installed in the housing on bearings, in the side wall of which the ends of the adjusting screws are fixed with a longitudinal relative displacement, and the rolling tool is made in the form of a ring with an internal convex surface mounted in a housing on a spherical bearing and in cooperation with the ends of the adjusting screws through the thrust bearing. I SS /// ± fpuzS 1B Iff