SU770579A1 - Rotary feeding arrangement for tube cold rolling mill - Google Patents

Description

The invention relates to pipe-rolling equipment, namely, to a rotary feeder device mainly mill cold pipe rolling. five

A rotary-feeding device for a cold-rolling mill tube is known, comprising a housing, a spindle housed in it, its rotation drive, sequentially installed groups of feed cups and clamping jaws with wedge bearing surfaces and mechanisms for radial movement of the jaws of each group having copiers, .one of which is stationary, and the other | <is connected to the spindle, and the cam bushings with internal wedge grooves, one of which is in contact with the clamping jaws, is set movably in the axial direction from o- 2 (feast connected with spindle £ ΐ].

In this device, the workpiece is clamped alternately by two groups of cams: one group serves for feeding and turning, and the other clamp-2ί and keeps the workpiece from rolling from the resulting axial forces. But at the moment of dwell, the workpiece is clamped simultaneously in two groups of cams. Since the first is the corpse *

2

When the cams constantly rotate, and the second does not, then there is an instant twisting of the workpiece or slipping of the cams along it. This leads to an overload of the device drive and contributes to the rapid wear of the wedges, which reduces their service life and the device as a whole.

In addition, the copier that controls the group of clamping cams is rigidly fixed to the drive spindle inside the device and does not have adjustment. Such a connection requires careful selection of the cams and profiles of the copier, as with a small height there is no reliable clamping of the workpiece, and at a height exceeding the required , the workpiece is clamped and the drive of the device is overloaded. Since the height of the cams changes due to their wear, it is necessary to adjust the device by replacing worn parts with new ones. Replacing the cams involves disassembling and assembling the entire device, i.e. time consuming.

The copier that controls the feed cam group has only one face profile and cannot provide

all necessary when rolling

770579

four

lichin innings Replacing the cam with another one with a different profile results in mill downtime, since a rod with a mandrel and a pipe must be removed from the device.

The aim of the invention is to increase the service life of the device, as well as reducing the time for setting the feed rate.

The goal is achieved by the fact that in the rotation of a foot-giving device, comprising a body, a spindle placed in it, its rotation drive, sequentially installed groups of feed cams and clamping with wedge bearing surfaces and mechanisms for radial movement of cams of each group having copiers, one of which connected to the spindle, and the cam bushings with internal wedge grooves, one of which, in contact with the clamping jaws, is mounted movably in the axial direction from the copier connected to the spindle, equipped with Lantseva sleeve 'having a tapered outer surface and the longitudinal grooves for clamping a cam. ki, and connected to its flange clip, installed pivotally relative to the body and freely part of the supporting sleeve of the clamping cams, which are outside, and their radial movement mechanism is equipped with a fork, one end connected to the cam, the other to the body and pivotally with the other part support sleeve. To reduce the time for setting the feed rate, the copier and the feed cams, which are connected to the spindle, are provided with retainers in the form of adjusting nuts placed on both sides of the copier and feed cams. ,

These differences make it possible to eliminate the preloading of the workpiece between the groups of cams and thereby reduce worn wear, as well as reduce the time for adjusting the feed amount.

FIG. 1 shows the proposed rotary feeder with cuts, 'in FIG. 2 is the same, section A-A in FIG. one.

The feeder and rotation device contains a housing 1, a hollow spindle 3 placed on bearings 2, rotation 4 drives 4, sequentially installed groups of feed cams 5 and clamping cams 6 with wedge bearing surfaces and mechanisms for radial movement of cams of each group.

The mechanism for moving the cams 5 of the feed includes a copier 7 in the form of a thick-walled cylinder having on the outer surface several profile grooves 8 for use without changing when changing to another feed amount, two diametrically 10

15

25

-35

55

20

thirty

40

45

50

60

65

laid fingers 9, interacting with the grooves of the copier, and connected with | Spindle 3 through the key 10, the support sleeve 11 with the inner wedge grooves under the wedge bearing surfaces of the cams, and the fingers set the feed cams 5 through the bearings 12 and have clamps relative to the spindle in the form of an adjusting nut 14, in which this spring rests, and an adjusting nut 15, which retains the cams with a ring protrusion and is mounted on the thread inside the spindle 3.

The mechanism of radial movement of the clamping jaws b comprises an annular single-paired copier 16 connected by a key 17 to the outer surface of the spindle, a plug 18 connected at one end to the copier through the fingers 19, and the other to the body 1 through a key 20 which is kept from turning, and a support sleeve 21 , movably mounted axially from the copier through the fork. A part of the support sleeve of the clamping cams is freely enclosed by the sleeve 22, which is mounted relative to the housing so that it can be rotated by means of bearings 23. Another part of the outer surface by means of thrust bearings 24 fixed to it by nut 25 has a hinge connection with a fork 18. Thus, the support sleeve 21 can rotate around the axis and move longitudinally along it.

For fixing and adjusting the copier 1 ^, the adjusting nuts 26 and 27 are installed on the spindle on either side of the copier. A flange bushing 28 with a tapered outer surface and longitudinal grooves for clamping jaws 6 is fixed on its flange flange with its flange.

The operation of the device for the filing and rotation of the workpiece is as follows.

Constant rotational movements from the main drive of the mill are transmitted to the drive 4 of the spindle 3. The spindle 3 rotates the fork 18 around the copier 7. At the same time, the fingers 19 track the profile of the groove of the copier and, according to its profile, the fork moves along the axis of rotation.

The fork 18 carries the support sleeve 21 with itself. When the fork moves to the left (forward), it and the support sleeve 21 move to the left, and the feed cams 5, which are pressed by the spring 13, remain for some time in place, but under the action of slopes approach radially to the axis, clamping the workpiece 29. When achieving sufficient adhesion of the cams to the workpiece, the cams 5 move together with the support sleeve 11 and disrupt the workpiece from the mandrel while simultaneously rotating it. In the extreme left position, fingers 19 of the fork 18 from 5

7 7С) ^D ) 7 9

6

Tracking up a copier profile.

At this point, the copier 16 with its profile acts on the fingers 19 of the fork and shifts it to the right (back). The fork moves the bearing 24 and together with them the supporting sleeve 21. The sleeve 21 with its inclined grooves acts on the cams 6, which move radially and clamp the workpiece. Thus, the workpiece is clamped in two places and under the action of the first group of cams rotates, turning the second group of cams together with the supporting sleeve 21, the holder 2 2.

Further rotation of the fork around the copier 7 causes the fork to return to its original position. When this Cams 5 release the workpiece and under the action of the spring 13 returns to its original position. At this moment, the given part of the blank 29 is rolled, but it is still held by the second group of cams, perceiving the resulting axial forces.

At the end of the return stroke of the working stand, the cams release the workpiece. The fork from the action of the groove profile of the copier 16 returns to its original position. The gauge shed opens. The device is ready for the next cycle.

In the process, the device must be adjusted. Adjusting the device to workpieces of similar diameters without replacing the cams is performed by adjusting nuts 26 and 27, which can move the cam 16 along the spindle to the left or right. If you need to clamp a larger diameter of the workpiece, the copier is shifted to the left.

In this case, the plug 18 will pull the sleeve 21 to the left, the cams 6 will diverge. If you need to press the smaller diameter of the workpiece, the copier is shifted to the right.

Given that the cams of both groups are the same and their mates with the support sleeves are the same, and the fact that one clamping group of cams is adjustable, the first group should also be adjusted with nuts 14 and 15. Using the nut 15, you can get a wide range of feeds. Copier 7 has several profile slots, in this case it provides four fixed feeds, for example 2, 4, 8 and 11 mm. By moving the cams 5 with the nut 15, it is possible to obtain intermediate feeds, since the time for clamping the workpiece and feeding it varies. The initial preload Cams 5 spring 13 is a nut 14.

The described turning-feeding device of the cold-rolling mill tube makes it possible to continuously adjust the feed amount, eliminates the twisting of the workpiece between the groups of cams, i.e. reduces wedge wear, thereby increasing the reliability of the device and its durability.

Claims (2)

Claim 1. Swivel-feeding device of a cold-rolling mill for pipes, comprising a body, a spindle placed in it, its rotation drive, sequentially installed groups of feed cams and clamping cams with wedge bearing surfaces and mechanisms for radial movement of cams of each group having copiers, one of which is connected with the spindle, and the cam bushings with internal wedge grooves, one of them in contact with the clamping jaws, is mounted movably in the axial direction from the copier connected to the spindle , characterized in that, in order to increase the service life of the device, it is provided with a flange bushing having a tapered outer surface and longitudinal grooves for clamping cams, and a clip connected to its flange mounted rotatably relative to the housing and freely extending outside of the supporting sleeve bushing cams, and their mechanism of radial movement is equipped with a fork, one end connected to the cam, the other with the body and pivotally with the other part of the outer surface of the support sleeve. 2. The device according to “1, characterized in that, in order to reduce the time for setting the feed amount, the copier and feed cams connected to the spindle are provided with latches in the form of adjusting nuts placed on both sides of the copier and feed cams. g