RU2488454C1 - Pipe cold-rolling mill stand - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to pipe rolling, particularly, to pipe cold rolling mill stand. Mill stand comprises stationary bed, moving housing with vertical working rolls arranged therein and rolls rack drive with gears and racks. Bottom racks is secured at stationary bed while top rack is attached to tip-up crossbar. Note here that mill stand is equipped with frame bolted to stationary bed lateral sides. Said frame end faces are attached to said bed by wedge joints. Tip-up crossbar is fitted in the frame of axle fitted in two bearings and locked by wedge. Said wedge is drive by hydraulic cylinder while crossbar has extra hydraulic cylinder with its casing articulated therewith. Rod cylinder is articulated with the frame. Note also that mill stand is equipped with protective means to cover bed working space composed of cover articulated with stationary bed to cover it and cases arranged at bed sides and end faces. Note here that said cover is provided with lifting hydraulic cylinders mounted at bed sides. Sumps are arranged at side casings while oil throwers are arranged at said cover.

EFFECT: higher operating performances and reliability.

10 dwg

Description

The invention relates to pipe production, and more specifically to the design of the working stands of mills for cold rolling pipes with a movable roll casing.

Known for the working stand of the cold rolling pipe mill (see AS USSR No. 1148660, class B21B 21/00, decl. 20.12.83, publ. 07.04.85), containing a movable housing, horizontally installed in it work rolls with rack and pinion gears located in the grooves of the work rolls half-disk gauges, and a wedge mechanism for moving the upper work roll.

A disadvantage of the known working stand of the cold rolling mill is the inability to accurately adjust the stand to any rolling diameter determined by the rolling route, since this design uses half-disc gauges installed in the grooves of the work rolls. This limits the technological capabilities of the mill.

The next disadvantage of this stand is its insufficient reliability and durability, since the points of contact between the caliber and the roll are intensively broken in operation, the caliber stream is shifted from the rolling axis, which leads to a decrease in the quality of rolled pipes and premature failure of the working stand.

The disadvantage of the working stand of the cold pipe rolling mill is also the difficult operating conditions, due to the fact that the gauge is changed in the mill line, for which the contractor needs to climb inside the crate and take all necessary measures in a confined space covered with technological grease, as a result of which it is possible for the worker to receive injuries and bruises.

Of the known working stands of the cold rolling mill, the closest in technical essence is the working stand of the cold rolling mill of pipes described in A.S. USSR No. 1490778, class B21B 21/00, claimed 11.19.87, publ. 04/27/2000

This working stand of the cold pipe rolling mill comprises a fixed bed, a movable housing connected to the drive with working rolls vertically arranged therein, their rack-and-pinion drive with gears located on the rolls and racks, the lower of which is installed in a fixed frame, and the upper one fixed on a reclining traverse mounted on an axis and fixed by a wedge driven by a hydraulic cylinder and a protective device. The axis of fastening of the leaning-down traverse is made console. The protective tool is made in the form of a cover and is mounted on the traverse. The rack-and-pinion drive under the working stand is closed by a casing displaced during transshipment.

A disadvantage of the known design of the working stand of the cold rolling mill is the lack of the possibility of unifying the bed, poured into concrete, for installing different types of working stands in it (stand with half-gauge gauges, stand with ring gauges, stand with support rolls, stands with horizontal rolls and so on further), which narrows the technological capabilities of the mill and limits the range of rolled pipes.

The next disadvantage of this stand is the manual disconnection of the beam from the bed and the manual connection of the beam with the bed during transshipment. Manually removing the yoke from the bed or putting it in place, turning it on the axis, is very difficult due to the high sliding friction forces between the yoke and the bed, and also because of the need to displace the casing covering the rack-and-pinion drive located under the working stand when removing and installation of work rolls. This increases transshipment time, narrows down technological capabilities and worsens operating conditions.

The disadvantage of this working stand is the fixing of the beam on the cantilever axis. Under the action of the loads, the axis bends, which violates the gear rack parameters - the contact spot and the lateral gap in the teeth. Intensive wear of the upper rack and roll gear occurs, which reduces the reliability and durability of the stand.

The objective of the present invention is to create a working stand for a cold pipe rolling mill, which allows to expand its technological capabilities by reducing the time for transshipment and ensuring rolling of pipes in small batches, to increase reliability and durability, as well as improve its operating conditions.

The task is achieved in that the working stand of the cold rolling mill, containing a fixed frame, a movable housing connected to the drive with working rolls vertically arranged therein, their rack-and-pinion drive with gears located on the rolls and rails, the lower of which is installed in a fixed bed, and the upper one is fixed on a reclining traverse mounted on an axis and fixed by a wedge driven by a hydraulic cylinder, and the protective device, according to the invention, is equipped with a fixed the base frame is fixed on the sides with bolts and on the ends with wedge connections, the reclining beam is fixed in the frame and its mounting axis is double-supported, in addition, the beam is equipped with an additional hydraulic cylinder, the body of which is pivotally mounted on the beam, and the rod is pivotally connected to the frame , the protective tool is made in the form of covering a fixed frame and pivotally mounted on it a cover equipped with lifting cylinders, and casings located on the side surfaces and ends motionless frame, wherein the side enclosures fitted drip trays, and on the cover - maslootboyniki.

Such a constructive implementation of the working stand of the cold pipe rolling mill allows you to expand technological capabilities, increase reliability and durability and improve its operating conditions.

The expansion of technological capabilities of the working stand of the cold pipe rolling mill is associated with:

- with minimal loss of time for transshipment of the mill when switching from one rolling route to another. At the mill it is possible to perform rolling along 2 ... 3 routes per shift, which contributes to more efficient loading of equipment, makes rolling of pipes available in small batches;

- with the universalization of equipment poured into concrete under stands with vertical and horizontal rolls. When rolling pipes with a stand with vertical rolls, a frame mounted on a fixed bed with a traverse under the upper rail is used. For rolling pipes with a cage with horizontal rolls, the frame with the traverse is easily removed and the work roll rails are put in its place.

Fixing the traverse on the frame, the implementation of the axis of its mounting two-bearing allows you to eliminate the misalignment of the axis, to reduce the wear of rack gearing, which increases the reliability and durability of the working stand of the mill.

Providing the crosshead of the upper rail with a tap drive in the form of a hydraulic cylinder facilitates transshipment, shortens its execution time, which extends the technological capabilities of the working stand and improves operating conditions.

The implementation of protective equipment in the form of a cover covering a fixed frame with casings and hydraulic cylinders for lifting it, as well as the installation of small collectors and oil chambers, improves operating conditions by eliminating the ingress of cutting fluid from the working area into the environment and protecting personnel from noise, vibrations and harmful fumes of the coolant.

To explain the invention, a specific embodiment of the invention is provided below with reference to the accompanying drawings, in which:

figure 1 shows the working stand of the cold rolling mill, General view;

figure 2 is a view of figure 1;

figure 3 is a section bB in figure 1;

figure 4 is a section bb in figure 1;

figure 5 - section GG in figure 1;

figure 6 - section DD in figure 4;

Fig.7 is a section EE in Fig.6;

in Fig.8 is a section FJ in Fig.5;

figure 9 is a section II in figure 4;

figure 10 is a view of K in figure 3.

The working stand of the cold pipe rolling mill contains a fixed frame 1, a movable housing 3 connected to the drive 2 with vertically arranged work rolls 4, 5, their rack and pinion drive with gears 6, 7 and racks 8, 9. Gears 6, 7 are located on the work rolls 4, 5. The lower rail 8 is fixed in the fixed frame 1, and the upper rail 9 is fixed on the reclining traverse 10. The working stand is equipped with a frame 11 mounted on the fixed frame 1, which is fixed on the sides by bolts 12, and on the ends by wedges connections 13. From the throwing yoke 10 is fixed in the frame 11 on an axis 14 made of a double support and fixed by a wedge 15, which is driven by a hydraulic cylinder 16. In addition, the yoke 10 is equipped with an additional hydraulic cylinder 17, the housing 18 of which is pivotally mounted on it, and the rod 19 is pivotally connected to the frame 11. The working stand has a protective means that covers the working space of the fixed bed 1. The protective means is made in the form of covering the stationary frame 1 and the cover 20 pivotally mounted on it and the casings 21 located on the side pivots rhnostyah and the ends of the fixed frame 1. The cover 20 is provided with a lift cylinder 22 mounted on the sides of the fixed frame. In addition, oil chambers 23 are installed on the side casings 21, and oil chambers 24 are installed on the lid 20.

The working stand of the cold rolling mill operates as follows. When rolling pipes, the movable housing 3 makes a reciprocating movement from the drive 2 in the fixed frame 1, while the gears 6, 7, interacting with the rails 8, 9, impart a swinging motion to the work rolls 4, 5, which run around the pipe, deform it in diameter and the wall.

Rolling is accompanied by the supply of a cutting fluid to the deformation zone to the pipe, which, with the help of the cover 20, casings 21, oil separators 24 and oil collectors 23, is collected in a stationary frame 1 and returned via pipelines to the technological lubrication system. This ensures reliable protection of the environment from the coolant and creates favorable working conditions for maintenance staff.

Transshipment of the working stand consists in replacing the used set of working rolls of the stand with another set of working rolls, previously prepared on a special stand outside the mill. Transshipment is associated with the need to switch to a new rolling route or is carried out in case of failure of the work rolls.

During transshipment, the mill is stopped and an unfinished pipe is removed from the cage. The movable housing 3 is set to the position of the beginning of the working area. By means of hydraulic cylinders 22, 16, 17, the cover 20 of the protective device rises, the wedge 15 for fixing the beam 10 is displaced upward, retracted towards the beam 10 with the top rail 9. Then, the rod 19 of the cylinder 17 is disconnected from the frame 11 and the beam 10 is manually turned on the axis 14 by an angle > 90 °, allowing access to work rolls. The spent set of rolls 4, 5 is lifted by a crane until the crate is completely exited from the casing 3 and removed to the side. A new set of rolls prepared in advance outside the mill is installed in the stand with a crane. The traverse 10 with the top rail manually returns to the connection position of the hydraulic cylinder 17 with the frame 11, the rod 19 is connected to the frame 11. Then the crosshead 10 with the hydraulic cylinder 17 is set to its original position and fixed by the wedge 15. The cover 20 is closed and the mechanisms of the working stand are brought into working condition. Simplicity and high level of mechanization of transshipment reduces the time of its implementation ..

The proposed working stand of the cold pipe rolling mill in comparison with the known ones allows to expand technological capabilities, increase reliability and durability, improve service conditions and reduce handling time.

Claims (1)

The working stand of the cold pipe rolling mill, comprising a fixed bed, a movable housing connected to the drive with work rolls vertically arranged therein, their rack-and-pinion drive with gears located on the rolls and racks, the lower of which is mounted in a fixed frame, and the upper one is fixed on a reclining traverse mounted on an axis and fixed by a wedge driven by a hydraulic cylinder, and a protective device, characterized in that it is equipped with a frame mounted on a fixed bed fixed on bolted to the sides and wedge-shaped at the ends, the reclining beam is fixed in the frame, and its mounting axis is double-supported, and the beam is equipped with an additional hydraulic cylinder, the body of which is pivotally mounted on the beam, and the rod is pivotally connected to the frame, the protective tool is made in the form of covering a fixed bed and a cover pivotally mounted on it, provided with lifting cylinders, and casings located on the side surfaces and ends of the fixed frame, while on the side casings oil collectors are covered, and oil collectors are on the lid.

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