JPS59103024A - Bearing device for heating roll of steel band - Google Patents

Abstract

PURPOSE:To prevent a bearing portion from being deformed by heat for thereby improving a sealing effect, by providing the inner peripheral face of bearing sleeve for journalling a roll shaft thereon with a nozzle adapted to spray a cooling medium against a cooling medium passage recess and one end of seal sleeve which rotates integrally with the shaft. CONSTITUTION:A bearing sleeve 32 is engageably secured to a roll shaft 25 for rotating integrally, whereas a recess is defined axially on the inner peripheral face of sleeve 32 in such a manner that a predetermined surface pressure may be secured. The recess is utilized to pass a cooling medium therethrough along a roll shaft surface and outflow through an outlet 35. Thereby, a bearing 33 can prevent its seizure and impair which would otherwise take place due to a temperature difference between the inner and outer ring thereof. On the other hand, the opened end of seal sleeve 26 is provided with a nozzle 30 adapted to spray a cooling medium against other sealed end to prevent the sealed end from being deformed by heat. Furthermore, the arrangement can prevent the deterioration of vacuum seal material 27 to improve the sealing effect for thereby retaining a vacuum pressure inside a container.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is attached to a device that deposits a metal such as Zn on one or both sides of a steel strip, and is a device that soaks or heats the width and thickness of the steel strip to a predetermined temperature using a roll. The present invention relates to a bearing device for a steel band heating roll that prevents thermal deformation of the bearing portion and enhances the sealing effect.

FIG. 1 shows a flowchart of the entire apparatus for soaking or heating a steel strip to a predetermined temperature. In the figure, a plurality of soaking or heating rolls 1 are housed in an indoor vacuum box-shaped container 2, and connection tunnels 3a and 3b having bellows at both ends of the container 2 for connecting the rolls to other devices are shown. are each arranged in a formula. On the other hand, the ends of both shafts of the roll 1 protrude outward from the container 2, and are supported by a bearing device. Further, a roll drive device 4 is connected to the end of the roll shaft,
The roll 1 is rotated inside the vacuum container by the roll drive device 4. On the other hand, a heat medium 5 flows inside the roll 1 for heating and soaking the steel strip wound around the outer periphery of the roll.

A heat medium heating device for circulating the heat medium 5 is attached via the roll shaft. The heat medium heating device is an oil storage tank 8
．． Oil supply pump9. Circulation pump 10. It is composed of a heater 11 and an expansion unit 12. On the other hand, a roll shaft cooling device consisting of a cooling fan 6 is attached to the roll shaft, and a true wall pump 7 is further provided in the container 2 .

The heat medium 5 flowing inside the roll 1 is drawn in from the outside via a valve 13a by an oil supply pump 9, and is stored in an oil storage tank 8. Thereafter, the heat medium 5 is supplied to the oil storage honda 9 via the valve 13b to a heating circulation line forming a closed loop.

The oiled heat medium 5 is supplied to the circulation pump 10. Flow control valve 1
3c, heat medium heater 11. It flows through a heat medium temperature control device 15 having a main setting and a sub-setting, and is circulated to the circulation pump 10 via an inlet rotary joint 14a, a roll 1 degree rotary joint 14b and an outlet rotary joint 14b.

In addition, in order to collect the amount of expansion of the heat medium due to the rise in temperature of the heat medium, an expansion tank 12 is provided at the top stage of the heat medium heating device, and is connected to the suction part of the circulation pump IO. ing. Also, during emergency and emergency inspections 1Fi-, the heat medium is returned to the oil storage tank 8 via the closed circulation line via the valve 13d.

Next, a cross section of the above-mentioned true container 2 is shown in FIG.

In the illustrated example, two rolls 1 are disposed inside the vacuum container 2. The steel strip 2o enters the vacuum vessel 2 via a moving plate passing kite 16 provided in the entrance tunnel 3a,
It is wound around the roll IK via the fixing guide 17 and reaches the exit tunnel 3b.

As shown in FIG. 3, the movable threading guide 16 slides over the fixed support 22 and the fixed threading guide 17. In addition, a fixed threading guide 17 and a moving threading guide 1 are provided.
6 is attached to the fixed bow 22 by poles 23 and 24.

On the other hand, the main container 2 is provided with a manhole 18 for maintenance and inspection, and a groove is provided in the flange portion of the manhole 18 to hold the main body, and a wall sealing packing 19 is fitted into the shaped groove. There is. Furthermore, the vacuum vessel 2 is provided with a mounting seat 21 for a radiation thermometer, which detects the temperature of the front steel strip 20 to be wound around the roll IK, and the signal is input to the heater 11 to The temperature of the heat medium 5 is controlled so that the temperature reaches a predetermined temperature.

In the above-mentioned band steel heating roll device, the present invention provides a bearing device that prevents thermal deformation of the roll bearing portion and enhances the sealing effect, and has a configuration in which the roll shaft is supported via a bearing sleeve. In addition, a groove through which a cooling medium flows along the outer circumferential surface of the roll shaft is tightly fitted into the inner circumferential surface of the 1R receiving sleeve and rotates integrally with the inner circumferential surface of the 1R receiving sleeve. is interposed 1L.

Furthermore, the other open end of the sleeve is provided with a nozzle that sprays a cooling medium toward the sealed end of the sleeve.

The present invention will be described in detail below based on embodiments shown in the drawings. FIG. 4 shows a cross section of the bearing device according to the present invention. The rotating shaft 25 of the roll 1 projects outside from the vacuum container 2 and is rotatably supported by a bearing portion, and a vacuum seal portion is provided between the bearing portion and the vacuum container 2.

Further, a drive gear 36 is fitted to the end of the roll shaft 25, and a rotary joint 14b is connected to the end of the shaft.

The bearing section is composed of a bearing sleeve 32, a bearing 33, and a housing 40 that accommodates them. The bearing sleeve 32 is shown in Fig. 4 (a) (b).
), the bearing sleeve 32 is fitted onto the roll shaft 25 and rotates together with the roll shaft 25, and the inner peripheral surface of the bearing sleeve 32 is provided with a groove in the axial direction within a range that ensures a predetermined surface pressure. The cooling mass flows along the roll shaft surface through the grooves,
It is adapted to flow out through outlet 35. On the other hand, a groove is provided in the circumferential direction on the outer peripheral surface of the bearing sleeve 32, and a bearing 33 is interposed between the bearing sleeve 32 and a housing 40 that accommodates these bearings. The roll shaft 25 is connected to a bearing 33 via a bearing sleeve 32 that rotates integrally with the roll shaft 25.
The sleeve is rotatably supported by the sleeve and has a structure in which the tension load of the roll 1 and the steel band 20 is received at both ends of the sleeve. Next, the vacuum seal portion is a sealing sleeve 26 that fits around the roll shaft 25. A sealing material 27 interposed between the sleeve 26 and the housing 40. It is formed by a nozzle 30 that cools the sealed end of the sealing sleeve 26 and a cooling medium supply/discharge path. One end of the sealing sleeve 26 is tightly fitted to the roll shaft 25 and rotates together with the roll shaft 25, while the other end of the sealing sleeve 26 is open. The sealing sleeve 26
A sealing material 27 is interposed between the outer peripheral surface of the container 2 and the housing 40 to maintain the solid-walled state of the solid-walled container 2.

On the other hand, a nozzle 30 is provided at the open end of the sealing sleeve 26 to spray a cooling medium toward the other sealed end. The nozzle 30 is provided between the sealing sleeve 26 and the roll shaft 25 at the same time as the sealed end, and is arranged radially along the circumferential direction, and has an inner circumferential wall portion that protrudes inside the housing 40. Supported by 41. A cooling medium flow path 9 is bored inside the inner circumferential wall portion 41 , and its supply port 29 opens to the outer circumferential surface of the housing 40 . Further, as shown in FIGS. 4 and 6, a cooling medium discharge port 31 is provided on the outer peripheral surface of the housing 40 on the roll side of the cooling medium supply port 29, and a cooling medium discharge port 31 is provided on the roll shaft end side of the supply port 29. A supply port 34 for a cooling medium flowing to the bearing portion is provided. Note that a grease inlet 28 is provided above the sealing material 27.

The graph in FIG. 7 shows the temperature at the contact area between the roll fII 125 and the sealing material three 7.264 parts.
°C, impinging coolant flow rate from the coolant blowing nozzle 30 to the sealed end 40 ITI/8. Cooling medium temperature: 30°C, sealing material: 7. Outer cylinder insulation and cylinder thickness: 12.
Thickness of the sealed end of the sealing screen when 5m is 11
The relationship between the temperature and the temperature of the contact portion of the sealing material 27 is shown. From this graph, when using pressure-resistant fluororubber as the sealing material 27, the allowable heat resistance temperature of the fluororubber, the sealing material Z
It is generally said that the J-wami of a 26-piece knife should be less than 10 pieces.

According to the roll bearing easy lid 1 of the present invention explained above, (1
) A sleeve for supporting the hollow sealing material is provided on the roll shaft between the rotating roll body and the bearings to reduce heat transfer from the heat medium flowing in the middle of the roll shaft, and at the sealed end of the sleeve. Heat deformation of sealed end by spraying cooling medium? By avoiding this and further avoiding deterioration of the vacuum sealing material, the true walls inside the container can be maintained.

(2) In the roll bearing +A, a longitudinal groove 9 circumferential groove is provided between the roll shaft and the bearing, and bearing grooved nullives are provided to receive the roll load at both ends, and the high temperature flowing through the center of the roll is provided. By reducing heat transfer and allowing the cooling medium to flow between the sleeve cylindrical groove and the shaft, it is possible to avoid bearing seizure and deterioration of the bearing material due to the temperature difference between the inner and outer rings of the bearing.

[Brief explanation of the drawing]

Figure 1 is a flowchart of the entire roll heating or soaking equipment.
FIG. 2 is a sectional view of the Makabe container in the above device, FIG. 3 is a partial sectional view showing the installation of the guide, FIG. 4 is a sectional view showing the bearing device according to the present invention, and FIG. 6 is a cross-sectional view of FIG. 4, and FIG. 7 is a graph showing the relationship between the thickness of the sleeve sealing edge and the temperature of the sealing material.
FIG. 8(a) is a schematic cross-sectional view of a sleeve for an Fi bearing. Figure A, 25-roll shaft, 2G-sealing sleeve, 27-sealing material, 30-nozzle, 32-bearing sleeve, 33-bearing

Claims (1)

[Claims] In a roll bearing device for a device that soaks or heats strip steel in rolls, the roll shaft is rotatably supported via a bearing sleeve, and the inner circumferential surface of the bearing sleeve has an outer circumferential surface of the roll shaft. A groove is provided along which the cooling medium flows,
Furthermore, a sealing sleeve is provided on the roll shaft, and one end of the sealing sleeve is hermetically fitted to the roll shaft so that the sealing sleeve rotates integrally with the roll shaft, and a sealing material is interposed between the outer periphery of the sleeve and the nozzle. , further comprising a nozzle disposed at the other open end of the sleeve to spray a cooling medium toward the sealed end of the sleeve.