RU2309043C1 - Tube continuous coiling mandrel - Google Patents

Abstract

FIELD: equipment for processing polymeric materials, possibly tube manufacture by continuous coiling.

SUBSTANCE: mandrel includes hollow shaft and mutually spaced sector cleats fastened in the form of three blocks. First block is fixed to shaft; second and third blocks are arranged between sector cleats of first block with possibility of reciprocation motion. Second and third block are secured to separate pushers inserted to shaft.

EFFECT: simplified design, improved operational reliability, enlarged manufacturing possibilities of mandrel.

2 cl, 7 dwg

Description

The invention relates to tooling for the manufacture of pipes.

Known mandrel for continuous winding of pipes containing a hollow shaft and sector slats (SU AS 1353645 A1, B29C 53/82, B29K 105/08, B29L 23/22).

According to its features and the achieved result, this mandrel is the closest to the claimed and adopted as a prototype.

It has sector planks made with longitudinal guide grooves, and is installed by them on the shaft by means of balls in cages; sector bars by means of cams covering the mandrel of the copier during rotation of the latter move reciprocating.

The disadvantage of this mandrel is the complexity of the design and low reliability.

The complexity of the mandrel design is explained by the implementation of all sector strips forming a winding surface, with the possibility of reciprocating movement, which in turn leads to a reduced shaft diameter, insufficient rigidity of the mandrel as a whole and explains the low reliability of the latter.

The objective of the invention is to simplify the design and increase the reliability of the mandrel.

This problem is solved by improving the mandrel for the continuous winding of pipes containing a hollow shaft and sector slats.

The improvement lies in the fact that spatially spaced sector planks are fastened in three blocks, the first of which is fixedly attached to the shaft, and the second and third are located between the sector planks of the first with the possibility of reciprocating movement and are fastened with separate pushers entering the shaft; blocks are fastened with separate pushers through bearings.

The fastening of spatially spaced sector planks into three blocks, the first of which is fixedly attached to the shaft, allows, for example, up to a third of sector planks to be fixed and significantly increase the stiffness of the shaft.

The location of the second and third blocks between the sector strips of the first with the possibility of reciprocating movement and fastening them with separate pushers entering the shaft, allows to increase the rigidity of the mandrel as a whole and to provide independent movement of the blocks of sector strips for the pushers.

The implementation of the mandrel according to the invention allows to simplify its design and increase reliability.

The fastening of the blocks with separate pushers through the bearings allows the rotation of the mandrel blocks to move blocks of sector strips without transferring their rotation to the pushers, which further increases the reliability of the mandrel design (and also allows to simplify the drive of moving blocks of sector strips).

Below, with reference to the attached drawing, where shown in:

figure 1 - General view of the mandrel;

figure 2 - General view of the mandrel with bearings;

figure 3 - section aa;

4 is a section bB;

5 is a section bb;

6 is a cross section GG;

Fig.7 is a section DD,

A description of the proposed mandrel is given.

The mandrel for continuous winding of pipes contains a hollow shaft 1 and sector planks and is characterized by the fact that spatially spaced sector planks are fastened in three blocks 2, 3, 4 (in Fig. The elements of one block are made with one hatch), the first of which is block 2 (from sector strips 5, rings 6 and screws fastening them 7) are fixedly attached to the shaft 1 with screws 7 and rings 8 (due to which, for example, up to a third of sector strips are fixed and the shaft stiffness is significantly increased). The second and third blocks - respectively 3 (from sector strips 9, rings 10, disks 11 and screws 7 fastening them) and 4 (from sector strips 12, rings 13, disks 14 and screws 7 fastening them) - are located between sector strips 5 of the block 2 with the possibility of reciprocating movement and fastened with separate pushers 15 and 16: block 3 - with the pusher 15, block 4 - with the pusher 16 (due to which the rigidity of the mandrel as a whole is increased and it is possible to move blocks 3 and 4 with pushers).

In the embodiment of the mandrel, the block 3 is fastened to the pusher 15 through the bearings 17, and the block 4 is fastened to the pusher 16 through the bearings 18 (which ensures the movement of the blocks without transferring their rotation with the mandrel to the pushers and the reciprocating drive is not shown).

Sector strips of block 2 and blocks 3, 4 can be made with peripheral (winding) surfaces of different sizes.

During the continuous winding of the pipe, blocks 3 and 4 from the extreme left (according to the drawing) position by the action of a drive (not shown) on the pushers 15, 16 are simultaneously moved to the right according to the drawing, while the wound pipe moves to the right together with blocks 3, 4. Then the pushers 15 , 16 with blocks 3 and 4, are alternately moved to the left according to the drawing, while the pipe remains stationary on the mandrel. After that, the described cycle is repeated many times, and the pipe moves along the mandrel for each cycle by one step.

The mandrel for continuous winding of pipes according to the invention is characterized in comparison with the prototype with greater simplicity of design and increased reliability and can be used for winding pipes of both small and large diameters, as well as with great technological capabilities for their manufacture, due to the elimination of the rigid connection of reciprocal movement of sector slats against rotation of the mandrel.

Claims (2)

1. Mandrel for the continuous winding of pipes, containing a hollow shaft and sector planks, characterized in that the spatially separated sector planks are fastened in three blocks, the first of which is fixedly fixed to the shaft, and the second and third are located between the sector planks of the first with the possibility of reciprocating displacements and are fastened with separate pushers entering the shaft. 2. The mandrel according to claim 1, characterized in that the blocks are fastened with separate pushers through bearings.

Images