UA114853C2 - Cooled strand guide roller - Google Patents

Abstract

The invention relates to a strand guide roller (30) for guiding a steel strand in a strand casting machine and to a method for cooling the strand guide roller (30) using a coolant. The aim of the invention is to provide a particularly robust cooled strand guide roller (30). This is achieved by a strand guide roller (30) having-a left (10a) and a right bearing block (10b); - a stationary axle (11), said stationary axle (11) being connected to the left (10a) and to the right bearing block (10b) in a torsionally rigid manner; - a cylindrical roller casing (12) and a left (13a) and a right bearing (13b), said roller casing (12) being supported by the left and right bearing (13a, 13b) in a rotatable manner relative to the stationary axle (11); and-a water conducting casing (1), wherein the water conducting casing (1) can conduct cooling water from a left cavity (14a) between the axle (11) and the water conducting casing (1) in the region of the left bearing (13a) into a longitudinal space (16) between the water conducting casing (1) and the roller casing (12), along the longitudinal space (16) in an axial (x) and a tangential direction (t), and from the longitudinal space (16) into a right cavity (14b) between the water conducting casing (1) and the axle (11) in the region of the right bearing (13b).

Description

TECHNICAL FIELD

The present invention relates to a roller of roller wiring for guiding a continuous steel billet in a continuous casting machine and a method of cooling this roller of roller wiring in a continuous casting machine with a cooling medium.

TECHNICAL LEVEL

From MO 2004/065040 Ai, a cooled roller of roller wiring is known, in which the cooling medium first cools the bearing in the left support riser, from the left support riser the cooling medium flows through the roller to the right support riser, and there, in turn, cools the bearing. The disadvantage of the known roller of roller wiring is that the cooling medium is introduced into the roller from the support riser always through a rigid or flexible connecting element and through the rotary input, or, accordingly, must be discharged again on the opposite side. Due to this, the resistance of the roller to mechanical damage is limited.

It does not appear from this publication how the design can be simplified so that, in particular, sensitive rotary inputs can be dispensed with.

BRIEF SUMMARY OF THE INVENTION

The object of the invention is to present a cooled roll of roller wiring for guiding a continuous steel billet in a continuous casting machine, which is characterized by a particularly simple design and is particularly resistant to mechanical damage and immune to interference. In this way, the service life of the roller of the roller wiring should be increased even in severe conditions in the continuous pouring machine.

Another object of the invention is to present a method of cooling the roller of the roller wiring in a continuous pouring machine, in which the cooling medium cools both support risers, and on the way between the two support risers, the cooling medium cools the bearings and the cylindrical body of the roller. Thus, the so-called "peripherally cooled" roller of roller wiring is created, which, thanks to its compactness and reliability, is also suitable for machines for continuous pouring of graded blanks, blooms and profiles.

Due to this, sensitive can also be poured on the same continuous bottling machine

From to cracks of steel grades with the production of long-dimensional products.

The first task is solved with the help of a roller of roller wiring for guiding a continuous steel billet in a continuous pouring machine, which has: - left and right support riser; - a fixed axis, and this fixed axis is connected without the possibility of rotation to the left and to the right support riser; - the cylinder body of the roller and the left and right bearing, and this rotating body of the roller with the help of the left and right bearing is supported with the possibility of rotation relative to the fixed axis; and - a water jacket, and this water jacket can conduct cooling water from the left cavity between the axle and the water jacket in the area of the left bearing into the longitudinal space between the water jacket and the roller body, along the longitudinal space in the axial and radial directions, and from the longitudinal space to the right the cavity between the water jacket and the axis in the area of the right bearing.

Due to the execution of the roller of the roller wiring with a fixed axis, which is connected without the possibility of rotation to the left and right support riser, a particularly smooth-running roller is created, which has a low moment of inertia of the mass. Thanks to this, the contact between the side surface of the roller and the continuous workpiece can be reliably maintained even under transient pouring conditions. The connection without the possibility of rotation can, for example, be carried out with a geometric locking (e.g. by means of a prismatic key) or with a force locking (e.g. by means of a hot press connection or a connection with a press fit or, accordingly, due to friction). The left bearing is cooled by cold water in the left cavity. The surface of the cylinder body of the roller is cooled by cooling water in the longitudinal space, and thanks to the direction of the cooling water in the axial and tangential directions, a particularly uniform temperature distribution is achieved.

Finally, the right bearing is cooled by cooling water in the right cavity.

A water jacket can be made especially simply and rationally from sheet steel parts, if it includes: - a cylindrical pipe, the wall thickness of which is less than the longitudinal length of this cylindrical pipe;

- several tangential outer ribs that extend on the outer side surface of the pipe in the axial direction along the longitudinal length of the pipe, while two outer ribs following one another in the axial direction are at a distance from each other; and - an axial external rib that extends on the outer side surface of the pipe in an axial direction along the longitudinal length of the pipe, while every two successive tangential external ribs alternately have a passage hole for cooling water on the right or left when viewed in the axial direction , on the side of the axial outer edge.

Through the water jacket, the cooling medium from the left cavity between the water jacket and the fixed axis is introduced into the longitudinal space between the roller body and the water jacket, is directed in this longitudinal space both in the axial and tangential directions, and from the longitudinal space is directed into the right cavity between the water jacket shirt and fixed axis. This not only achieves a particularly even temperature distribution of the surface of the roller body, but also cools the left and right bearing.

The cylindrical tube, the tangential outer fins and the axial outer fin are preferably sheet steel bent parts, the outer fins being joined to the tube by joining (eg, brazing, welding or gluing).

An alternative water jacket includes: - a cylindrical pipe, the wall thickness of which is less than the longitudinal length of this cylindrical pipe; - at least one spiral-shaped outer rib, which extends on the outer side surface of the pipe at least once spirally around the longitudinal length of this pipe.

With this version of the water jacket, the cooling medium is directed tangentially and axially along the side surface of the pipe with the help of at least one, if necessary, several spiral outer ribs, due to which a very even distribution of surface temperature on the side surface of the pipe is also established. The helical outer rib can be connected to the pipe either by butting, or produced from the pipe by milling or turning.

It is especially advisable if the water jacket has at least one, preferably two or

From several internal ribs that extend from the inner side surface of the pipe in the radial direction to the fixed axis. Thus, t.3z is prevented. "hydraulic short circuit" between the two cavities, which are respectively between the left end region of the axle and the roller housing and the right end region of the axle and the roller housing. This forces the cooling medium to flow from the left cavity along the longitudinal space to the right cavity, thanks to which high heat removal from the pouring product is ensured.

Preferably, if the left and right support risers each have a hole for placing a stationary axis, and this support riser has at least one, preferably closed cavity in the tangential direction around the hole. Thanks to the cavity in the support riser, which is washed with a cooling medium, both the support riser itself and the sealing element for sealing in the outer direction are cooled.

For introducing the cooling medium from the support riser into the axle, it is advisable if the cavity in the support riser has essentially a radial inlet channel for directing the cooling water from the support riser into the axis. Although the radial intake channel has the shortest length, there is no need for an exact radial arrangement of this intake channel.

It is better if each half of the fixed axis in the longitudinal direction has a separate axial channel for passing the cooling medium and a radial inlet channel connected to it into the cavity.

For fluid-tight sealing of the left bearing relative to the left cavity or, accordingly, the right bearing relative to the cavity, at least one sealing element is provided.

Simple fluid-impermeable sealing can be carried out, for example, with the help of the so-called prelon ring (see, e.g., MO 2011/117383 A1 for a variant of the implementation of seals in rollers of roller wiring by means of prelon rings), by means of sealing rings or by means of rotary seals, such as contact sealing rings.

Protection of the bearing against the environment can be carried out, for example, with the help of radial shaft sealing rings or labyrinth seals. But the specialist 60 knows, of course, other options for sealing bearings.

The second named problem is solved by means of a method of cooling a roller of roller wiring in a machine of continuous filling with a cooling medium, and this roller of roller wiring includes: - left and right support riser, which has a left and right bearing; - fixed axis; - the cylinder body of the roller, and this rotating body of the roller with the help of the left and right bearings rests with the possibility of rotation relative to the fixed axis, which includes the following steps of the method: - washing the fixed axis with a cooling medium inside the left support riser; then - the entry of the oOHoOLlodzhuval medium from the left support riser into the stationary axis; - flow through the first axial channel of the stationary axis; - entrance to the roller cavity of the roller wiring; - washing the cavity, while cooling the left and right bearing; - flow through the second axial channel of the stationary axis; - entrance of the cooling medium from the stationary axis to the right support riser; - washing the stationary axis with a cooling medium inside the right support riser.

Due to the predominantly complete circumferential washing of the stationary axis inside the left or, accordingly, the right support riser, this support riser is cooled. Thanks to the washing of the cavity, both bearings on the axis and the roller housing are also cooled.

In order to avoid the above-mentioned hydraulic short circuit, preferably, if the cavity includes the left cavity, the longitudinal space and the right cavity, at the same time - the cooling medium from the left cavity flows into the longitudinal space between the water jacket and the roller body; - the cooling medium flows in the axial direction through the longitudinal space; and then - the cooling medium from the longitudinal space flows into the right cavity.

At the same time, the so-called roll of roller wiring with peripheral cooling is formed.

In order to achieve a particularly uniform temperature of the surface on the roller body, it is better if the cooling medium, when flowing through the longitudinal space, performs a tangential movement around a fixed orbit in addition to the axial movement.

BRIEF DESCRIPTION DRAWING

Other advantages and features of this invention are contained in the further description of non-limiting examples of implementation, while the figures show: fig. 1: perspective view of the roller of roller wiring proposed by the invention; fig. 2: right view of the roller of the roller wiring according to fig. 1; fig. 3: a view from the right of one of the versions of the roller of the roller wiring according to fig. 1; fig. 4 - fig. 2: cross-sectional view along the lines A-A of fig. 2; fig. 5: perspective view of the first version of the water jacket; fig. 6: perspective view of the second version of the water jacket; fig. 7: longitudinal section of fig. 6.

DESCRIPTION OF IMPLEMENTATION OPTIONS

In fig. 1 shows a perspective view of the non-driven roller 30 of the roller wiring proposed by the invention for supporting and guiding a steel continuous billet having a profile of graded billet or bloom in a continuous casting machine. The continuous workpiece, not shown, rests on the cylindrical surface of the rotating housing 12 of the roller, and this housing 12 of the roller with the help of not shown in fig. 1 of the bearings 13a, 135 (see Fig. 4) rests rotatably on the fixed axis 11.

In fig. 2 shows a side view of the roller 30 of the roller wiring from fig. 1. Each support rack 1ba, 106 can be connected to the roller wiring or, accordingly, a segment of the roller wiring, by means of off-center holes and non-illustrated fastening means, such as screws.

In fig. 3 schematically shows the right support riser 105 and the flow through the support riser of the cooling medium (e.g., water). At the same time, the cooling water, as shown by the lower arrow, enters the support riser 10p from below and flows vertically upwards.

Then the cooling water is diverted four times in each case by 90", so that the cooling water can completely wash the fixed axis 11 in the closed cavity 14. This ensures uniform cooling of the axis 11 or, accordingly, the roller connected to the axis of the housing 12. The cooling water can enter from the cavity 14 through the radial inlet channel 15 into the axial channel 22 inside the axis 11. In addition, through the hole 21" for consistency, lubricating grease or lubricating oil for lubricating the bearing 130 can be introduced. Through the drainage holes 24, which in the sealed area are located in in each case, between the grease-filled or oil-filled bearing space and the water-filled cavity 14, 14a, 14r, as water, or the grease/oil or water may move through the stationary axis 11 into the non-pressurized environment. Thanks to this, the operator can directly monitor the functionality of the roller 30 of the roller wiring from the outside without the need to intervene in the roller.

In fig. 4 shows that the cooling water from the inlet channel 15 through the axial channel 22 and the radial hole can enter the cavity 14, 14a, which is limited by the fixed axis 11, the rotating housing 23 of the bearing and the water jacket 1. Through the cavity 14a, which is connected to the longitudinal space 16 between the water jacket 1 and the inner side surface of the roller body 12, the prelon seal 17 and the bearing 13a are cooled.

The membrane seal has three dynamic sealing elements (specifically contact sealing rings) on its inner side surface, and two static sealing elements (here - circular rings) on its outer side surface. During operation, at the same time, the rotary prelon seal (also called the prelon ring) 17 rests on the stationary axis 11.

To prevent contamination of the bearings 13a, 135, the bearing 13a is sealed relative to the support riser 10a using a labyrinth seal 19 and a ring 18 for radial shaft sealing. The same happens with the right bearing 1365 in the support riser 105.

It is shown in more detail in fig. b water jacket 1 has the following functions: firstly, hydraulic short circuit between the left cavity 14a and the right cavity 14r is prevented. This forces the cooling water to flow from the left cavity 14a through the longitudinal space 16 to the right cavity 14r. Due to the flow through the longitudinal space 16 in the axial and tangential direction, a uniform temperature of the surface of the body 12 of the roller or, accordingly, of the continuous steel blank lying on it is achieved. The immovable axis 11 is connected with power locking to the support riser 1b0a, 10Ю0. The housing 23 of the bearing is connected to the housing 12 of the roller by a tight welded connection.

Zo In fig. 5 shows the first version of the water jacket 1. The water jacket has a thin-walled cylindrical tube 2 made of sheet steel, an axial outer rib b, which extends in the axial direction x along the length of the tube 2, and several tangential outer ribs 5 located one after the other in the axial direction, which are at a distance. In order to force the cooling water to flow into the longitudinal space between the water jacket 1 and the roller body, the jacket includes, in addition, on the inner side surface of the tube 2 at least one, here two inner ribs 9.

Thus, the inner side of the housing 12 of the roller is cooled by cooling water in the direction shown by the arrows.

In fig. 6 shows the second version of the water jacket 1. At the same time, the cooling water spirally washes the water jacket 1 or, accordingly, the inner surface of the housing 12 of the roller.

In fig. 7 shows a longitudinal section of the water jacket 1 from fig. 4 and 6. The spiral outer rib 8, as well as the inner ribs 9, are welded to the pipe 2.

Although the invention has been further illustrated and described in detail with the help of preferred embodiments, the invention is not limited to the disclosed examples, and a person skilled in the art can deduce from this other options without leaving the scope of protection of the invention.

LIST OF REFERENCES

1 Water jacket 2 Pipe

C Wall thickness 4 Longitudinal length 5 Tangential outer rib 6 Axial outer rib 7 Through hole 8 Spiral outer rib 9 Inner rib 1ba, 1065 Support rack 11 Axle 12 Roller body 1Za, 1365 Bearing 14, 14a, 1465 Bo cavity 15 Inlet channel

16 Longitudinal Space 17 Prelon Ring 18 Radial Shaft Seal Ring 19 Labyrinth Seal 20 Circumferential Groove 21 Hole 21" Grease Hole 22 Axial Channel 23 Bearing Housing 24 Drainage Hole

ZO Roller roller wiring g Radial direction

Y Tangential direction x Axial direction

Claims (13)

FORMULA OF THE INVENTION 20 1. A roller (30) of roller wiring for guiding a continuous steel billet in a continuous casting machine, which has: left (10a) and right support risers (1065); fixed axis (11), and this fixed axis (11) is connected without the possibility of rotation to the left (10a) and to the right support risers (10B); 25 cylinder body (12) of the roller, as well as left (1Za) and right bearings (130), and this body (12) of the roller with the help of left and right bearings (13a, 136) rests with the possibility of rotation relative to the fixed axis (11); and a water jacket (1), and this water jacket (1) can conduct cooling water from the left cavity (14) between the axis (11) and the water jacket (1) in the area of the left bearing (13a) in the longitudinal space (16) between water jacket (1) and roller housing (12), along the longitudinal space (16) in the axial direction (x) and tangential direction (Y), and from the longitudinal space (16) into the right cavity (145) between the water jacket (1) and the axis (11) in the region of the right bearing (1365). 2. The roller of roller wiring according to claim 1, which is characterized by the fact that the water jacket (1) has: 35 cylindrical tube (2), the thickness (3) of the wall of which is less than the longitudinal length (4) of this cylindrical tube (2); a number of tangential outer ribs (5) that extend on the outer side surface of the pipe (2) in the axial direction (x) along the longitudinal length (4) of the pipe (2), with two outer ribs (5) following each other in the axial direction (x) are at a distance of 40 from each other; an axial outer rib (b) that extends on the outer side surface of the pipe (2) in the axial direction (x) along the longitudinal length (4) of the pipe (2), while every two successive tangential outer ribs (5) in turn have a passage hole (7) for cooling water on the right or left, if viewed in the axial direction, side of the axial 45 outer rib (6). 3. A roller of roller wiring according to claim 1, which is characterized by the fact that the water jacket (1) includes: a cylindrical pipe (2), the thickness (3) of the wall of which is less than the longitudinal length of this cylindrical pipe (2); at least one spiral outer rib (8) which extends on the outer side surface 50 of the pipe (2) at least once spirally around the longitudinal extent (4) of this pipe (2). 4. A roller of roller wiring having a water jacket (1) according to one of claims 2 or 3, which has at least one, preferably two internal ribs, which extend from the inner side surface of the pipe (2) in the radial direction (d) to the fixed axis (11). 55 5. The roller of roller wiring according to one of the previous paragraphs, while the left (1ba) and/or the right support riser (105) each have a hole (21) for placing a fixed axis (12), which is characterized by the fact that the support riser (ba , 1060) has at least one, preferably closed, cavity (14, 14a, 14b) in the tangential direction () around the opening (21). 6. A roller of roller wiring according to claim 5, which is characterized by the fact that the cavity (14, 14a, 1465) in the support riser (10a, 106) has essentially a radial (d) inlet channel (15) for directing cooling water from the support riser ( 10a, 106) in axis (12). 7. A roller of roller wiring according to one of the previous items, which is characterized by the fact that each half of the fixed axis (11) has an axial channel (22) for passing the cooling medium and an inlet channel (15) connected to it into a cavity that passes essentially radially 8. The roller of roller wiring according to one of the previous clauses, which is characterized by the fact that the left and/or right bearing (1Z3a, 136) is sealed against the cavity (14, 14a, 145) in each case by means of a sealing element. 9. Roller of roller wiring according to claim 8, which is characterized by the fact that the sealing element is a prelon ring (17). 10. A roller of roller wiring according to one of the previous items, characterized in that the fixed axis (11) has a drainage hole (24), and this hole connects the environment with the compacted area. 11. A method of cooling a roller (30) of roller wiring in a machine of continuous pouring with a cooling medium, and this roller (30) of roller wiring includes: left (10a) and right support risers (106), which have left (13a) and right bearings (135 ); fixed axis (11); cylinder body (12) of the roller, and this rotating body (12) of the roller is supported with the help of left and right bearings (1Za, 136) with the possibility of rotation relative to the fixed axis (11), which includes the following steps of the method: washing the fixed axis (11) inside of the left support riser (1b0a) with a cooling medium; then the entrance of the cooling medium from the left support riser (10a) into the stationary axis (11); flow through the first axial channel (22) of the fixed axis (11); the entrance to the cavity (14) inside the roller (30) of the roller wiring; washing the cavity (14), while cooling the left and right bearings (13Za, 135); From the flow through the second axial channel (22) of the fixed axis (11); the entrance of the cooling medium from the stationary axis (11) to the right support riser (105); washing the stationary axis (11) inside the right support riser (105) with a cooling medium. 12. The method according to claim 11, which is characterized by the fact that the cavity (14) includes the left cavity (14a), the longitudinal space (16) and the right cavity (1460), while the cooling medium from the left cavity (14a) flows into the longitudinal space ( 16) between the water jacket (1) and the body (12) of the roller; the cooling medium flows in the axial direction (x) through the longitudinal space (16); and then the cooling medium from the longitudinal space (16) flows into the right cavity (146). 13. The method according to claim 12, which is characterized by the fact that the cooling medium, when flowing through the longitudinal space (16), additionally performs a tangential movement (d) around a fixed axis (11).