JP2561143Y2 - Perforated roll - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a roll having a cooling medium or a heating medium flow path used in a continuous casting facility, a rolling facility, a surface treatment facility, and the like. The present invention relates to a porous roll having a function capable of effectively reducing or uniformizing.

[0002]

2. Description of the Related Art In a continuous casting facility, a rolling facility, a surface treatment facility, etc., a roll provided with a cooling medium or a heating medium flow path in the roll in order to reduce or equalize thermal deformation and thermal stress generated in the roll includes: For example, FIGS. 15A and 15B
The roll shown in (C) is known. The roll 1 shown in FIG. 15 (A) has a through hole 1-1 formed at the center of the roll and penetrating the roll body and the shaft.
It has a structure in which a cooling medium or a heating medium flows. In the roll 2 shown in FIG. 3B, a spiral flow path 2-2 provided on the inner peripheral surface of the sleeve 2-1 and a flow path 2-3 provided on the roll shaft communicate with each other, and flow in from the roll shaft. The cooling medium or the heating medium thus formed flows in the spiral flow path 2-2. Roll 3 shown in FIG.
No.-24354), a through hole 3-1 provided in the roll shaft portion communicates with a through hole 3-2 provided in the vicinity of the outer peripheral surface of the roll, and a plurality of slits 3-3 are formed in the circumferential direction of the roll surface. The cooling medium or the heating medium flowing from the roll shaft portion flows through the through-hole 3-2 near the outer peripheral surface of the roll.

[0003]

However, the conventional roll described above has a structure in which a cooling medium or a heating medium flows only at the center of the roll or at the outer periphery of the roll. There is a problem that a large temperature difference occurs between a portion in contact with the object and a portion not in contact with the object, and the temperature difference also increases between the roll surface and the central portion.

FIG. 16 shows, as an example, a measurement example of the roll surface temperature when the roll 1 having the through hole 1-1 in the center of FIG. 15 (A) is used as a transport roll of a continuous cast slab. It is. This roll temperature measurement example is a roll diameter of 360 mm, a casting speed of 2.0 m / min, and a billet temperature of 10
In the case of the specification condition of 00 to 950 ° C., cooling water was supplied to the transport roll to cool the roll. As is clear from the data in FIG. 16, the temperature of the portion of the roll surface that is in contact with the slab is the highest, and the temperature of the portion of the roll surface that is not in contact with the slab is low. That is, a temperature difference of 30 ° C. or more occurs between the surface of the roll that contacts the high-temperature object and the surface that does not. This is shown in FIG.
A similar temperature difference occurs for the roll (C).

[0005] When a large temperature difference is generated between a portion in contact with an object and a non-contact portion on such a roll surface portion, excessive thermal stress and thermal deformation are generated in the roll. Excessive thermal stress results in a reduction in roll life, and thermal deformation has a negative effect on the quality of the unsolidified slab, for example in the case of a slab support roll of a continuous casting machine. Further, a large amount of cooling water is required to lower the roll to a predetermined temperature. If a large amount of cooling water is supplied, supercooling occurs and the temperature distribution in the roll becomes more non-uniform, so that uniform cooling of steel and the effect of reducing cooling water cannot be expected.

On the contrary, when a heat medium such as hot air or steam is supplied to the roll to heat the low-temperature object by the roll, the temperature difference between the contact portion and the non-contact portion of the roll surface is also increased. This causes uneven thermal stress and thermal deformation on the roll, and adversely affects the contact object.

[0007] In view of such a problem of the temperature difference of the conventional roll, the present invention can make the temperature distribution in the roll uniform without increasing the amount of cooling medium or heating medium used.
An object of the present invention is to provide a porous roll capable of reducing and uniformizing thermal stress and thermal deformation generated in the roll.

[0008]

SUMMARY OF THE INVENTION The present invention is directed to a roll for cooling a portion contacting a high-temperature object or heating a portion contacting a low-temperature object when a fluid is used as a cooling or heating medium. By supplying a large amount of the fluid to the part that comes into contact with the object and a small amount to the other part, the temperature distribution inside the roll can be made uniform and the roll can be cooled or heated efficiently.
The gist is to have a plurality of flow paths parallel to the roll axis on concentric circles near the roll surface layer,
The flow is determined by the number of closing or restricting the plurality of channels.
It is characterized by having arranged a flow rate adjustment jig to adjust the amount ,
The roll body has a plurality of inclined flow paths in the roll axis direction, and the plurality of flow paths are closed at both ends of the roll body.
Characterized in that a flow rate adjusting jig for adjusting the flow rate according to the number of steps to be performed or the number of throttles is provided, and that a temperature measuring device is incorporated in a porous roll having a flow path parallel to the roll axis or an inclined flow path. It is a feature.

[0009]

The flow path formed in a concentric circle near the roll surface layer in parallel with the roll axis is provided at an arbitrary interval on the concentric circle of the roll main body. Further, the inclined flow passage formed in the roll main body in the roll axis direction can be provided so that one end is opened near the roll surface layer and the other end is opened near the roll center.

When a cooling medium or a heating medium is passed through a plurality of flow paths formed at an arbitrary interval in parallel with the roll axis on a concentric circle near the roll surface layer, the cooling medium near the roll surface layer is In the case of (1), the roll surface temperature can be efficiently reduced, and in the case of a heating medium, the roll surface temperature can be efficiently increased. In addition, when a cooling medium or a heating medium is caused to flow through the inclined flow passage formed in the roll body in the roll axis direction, not only the roll surface temperature but also the temperature of the roll center can be efficiently controlled.

The flow rate adjusting jigs disposed at both ends of the roll include, for example, a channel corresponding to a half of the roll among a plurality of parallel flow paths or inclined flow paths formed in the roll body. A semi-circular or fan-shaped flow control plate with a closable area or a front with a throttle hole (orifice)
The semicircular or fan-shaped flow rate adjusting plate can be rotatably mounted on the center of the roll and used. The size of the flow control plate can be determined by how much fluid flows through the flow path on the side that does not contact the object. That is, it is determined according to the number of channels to be closed or the number of channels to be throttled .

By mounting this flow control plate, for example, so as to close the flow path in the lower half of the roll, the fluid flows more in the upper half of the roll and less in the lower half. Conversely, by mounting a flow control plate so as to close the flow path in the upper half of the roll, the fluid flows more in the lower half of the roll and less in the upper half. Therefore, when applying the porous roll having the flow rate adjusting plate to, for example, a transport roll including a pair of upper and lower rolls for transporting a high-temperature steel material and cooling the roll, the lower roll closes the lower half flow path of the roll. A porous roll having a flow rate adjusting plate attached thereto is used, and a porous roll having a flow rate adjusting plate attached so as to close the upper half flow path of the roll is used as the upper roll. That is, the flow rate adjusting plate is attached so that a large amount of the cooling medium flows on the side that comes into contact with the high-temperature steel material. As a result, the side of the roll that contacts the high-temperature steel material has a large cooling effect due to the flow of a large amount of the cooling medium, and the side that is not in contact with the high-temperature steel material has a small cooling effect due to the small flow of the cooling medium,
The temperature difference between the part in contact with the object and the non-contact part on the surface of the roll is reduced, and the temperature distribution in the roll is made uniform. In addition, in the case of the inclined flow path, not only the temperature difference between the portion in contact with the object and the non-contact portion on the surface of the roll is reduced, but also the temperature difference between the roll surface and the center of the roll is reduced. As a result, the temperature distribution in the roll becomes more uniform. It goes without saying that the same applies to the case where a heating medium is used as the fluid.

As the flow rate adjusting jig disposed at both ends of the roll, an automatic opening / closing method in which the opening of the flow path is opened / closed by an automatically operated stopper is used instead of the plate-shaped member. Can also. In this case, the number of plugs is determined in accordance with the number of flow paths, and the mechanism is designed such that the side in contact with the object is open and the non-contact side is closed. In this method, the flow rate of the fluid flowing through the flow path can be adjusted by adjusting the closing force of the stopper. When this automatic opening / closing method is adopted, a temperature measuring device is built into the roll to constantly measure the temperature of the roll, and based on the measured temperature, it is determined whether the side is in contact with the object or not, and the opening and closing of the stopper is controlled. You can also.

As described above, in the case of a porous roll having a flow rate adjusting jig, the temperature distribution inside the roll can be made uniform without increasing the amount of cooling medium or heating medium used, and the thermal stress and heat generated in the roll can be improved. Since the deformation can be reduced and made uniform, the life of the roll can be extended and the adverse effect on the contact object can be minimized.

[0015]

FIG. 1 is a longitudinal sectional side view showing an example of a perforated roll according to claim 1 of the present invention, FIG. 2 is a longitudinal sectional front view taken along the line A--A of FIG. 1, and FIGS. FIG. 5 is a longitudinal sectional view taken along the line AA of FIG. 1 showing another example of such a flow control jig. FIG. 5 is a pair of upper and lower high-temperature steel materials of the porous roll with the flow control jig shown in FIGS. FIG. 6 is a schematic front view showing an example of use of a transfer roll, FIG. 6 is a side view showing an example of an automatic opening / closing type flow adjusting jig according to the present invention, FIG. FIG. 9 is a vertical cross-sectional view taken along line AA of FIG. 1 showing another example of a perforated roll according to claim 1 of the present invention. FIG. 9 is a longitudinal side view showing an example of a perforated roll according to claim 2 of the present invention. FIG. 10 is a longitudinal sectional front view taken along the line AA of FIG. 9, and FIG. 11 is a perspective view of a perforated roll according to claim 2 of the present invention. FIG. 12 is a vertical cross-sectional front view taken along line AA of FIG. 11, and FIG. 13 is a schematic view showing an example of a porous roll incorporating a temperature measuring device according to claim 3 of the present invention. , 11 are porous rolls, 11-1, 11-
2 is a flow path, 12, 13, and 14 are flow rate adjusting plates, 15 is an automatic opening / closing type flow rate adjusting jig, 16-1 and 16-2 are temperature measuring devices, and 17 is a high-temperature steel material.

That is, the porous roll 11 shown in FIG.
A plurality of flow paths 11-1 parallel to the roll axis are provided at arbitrary intervals on a concentric circle near the surface layer of the roll, and a flow control plate 12 having, for example, a semicircular shape is provided at both end surfaces of the roll by its own weight. It is pivotally attached to the center of the roll so as to be positioned in the lower half. At this time, the flow rate adjusting plate 12 is attached so that a slight gap is formed between the flow rate adjusting plate 12 and the roll end face, and a small amount of fluid can flow. Therefore, as shown in FIG. 2, the multi-aperture roll 11 having the flow rate adjusting plate has the upper half flow path 11-1 opened and the lower half flow path closed or a small gap. If there is, only a small amount will flow. The cooling medium or the heating medium flows through the flow path 11-2 of the roll shaft portion and flows through the flow path 11-1 of the roll. However, since the flow rate adjusting plate 12 is located in the lower half of the roll, the fluid is not rolled. Flows more in the upper half and less in the lower half of the roll.

The perforated roll shown in FIG. 3 has a flow control plate 13 which opens the lower half of the roll and closes the upper half, in which case the flow control plate 13 is always positioned on the upper side. A weight 13-1 is provided so as to be positioned, and is rotatably pivoted to the center of the roll. When the flow regulating plate 13 is always located in the upper half of the roll, the fluid flows more in the lower half of the roll and less in the lower half.

FIG. 4 shows an example of a fan-shaped flow rate adjusting plate. In this case, the fan-shaped opening θ is set in accordance with the number of channels to be closed. In the figure, reference numeral 14-1 denotes a flow control opening (orifice).
An office), the opening is not limited to fan flow rate adjusting plate, FIG. 1, FIG. 2, may be provided if necessary in a semicircle of the flow rate adjusting plate shown in FIG. This flow adjustment hole 14
In the case of a flow control plate with -1, the flow control opening 14-
The flow rate is adjusted by squeezing at 1.

In FIG. 5, the lower roll is a porous roll 11 having a flow rate adjusting plate 12 shown in FIGS. 1 and 2, and the upper roll is a porous roll 11 having a flow rate adjusting plate 13 shown in FIG. That is, a pair of upper and lower steel material transport rolls is constituted by a perforated roll provided with a flow rate adjusting plate so that a large amount of the cooling medium (cooling water) flows to the side in contact with the high-temperature steel material 17. Therefore, in the case of the steel material conveying roll having such a configuration, during the high-temperature steel material conveyance, a large amount of the cooling water always flows on the side in contact with the high-temperature steel material 17 and a small amount of the cooling water flows on the non-contact side. At the same time, the temperature distribution in the roll is made uniform.

6 and 7, the automatic opening / closing type flow rate adjusting jig is provided with a pair of arms 15-2 in, for example, a 180-degree direction on a bearing 15-1 projecting from the center of the roll end face.
3, each arm is rotatably connected to each other, and a stopper 15-4 facing the opening of the flow path 11-1 is attached to the tip of each arm, and each arm is always rearwardly moved by a coil spring 15-5. And an electromagnet 15− provided on the roll end face and the arm.
At 6, the stopper 15-4 opens and closes.
That is, when the electromagnet 15-6 is energized (on), the arm 15-2 rotates forward (roll end face side) against the coil spring 15-5, the flow path is closed by the plug 15-4, and the energization is cut off ( off) and the pressing force of the coil spring 15-5, the arm 15-2 rotates rearward, and the flow path is opened by the plug 15-4. In this case, the electromagnet 15-
By adjusting the force of 6, it is possible to bring the stopper 15-4 into a fully opened or neutral state which is not completely closed,
Fluid flow can be regulated. In addition, stopper 15-4
Here, the case where two are provided is shown, but it goes without saying that an appropriate number is provided in accordance with the number of the flow paths 11-2. In addition,
The means for opening and closing the stopper 15-4 is not limited to the above-described electromagnet type, but may be provided by, for example, providing a rotary wedge.

In the automatic opening / closing type porous roll provided with a flow adjusting jig, for example, the plug 15-4 located on the side in contact with the high-temperature object opens the flow path by turning off the electromagnet 15-6 on this side, and the fluid is opened. It flows a lot. On the other hand, the plug 15-4 located on the non-contact side with the hot object is the electromagnet 15 on this side.
When -6 turns on, the flow path is closed and the fluid flows less. Therefore, also in this case, the temperature distribution in the roll can be made uniform, as in the case described above.

The porous roll 11 shown in FIG. 8 has a plurality of flow paths 1 parallel to the roll axis on a concentric circle near the surface of the roll.
This is a case where a large number of 1-1 are provided. In this case, the flow path 11-
The number and interval of 1 are not particularly limited, and are appropriately determined according to the roll diameter.

In the porous roll 11 shown in FIGS. 9 and 10, the flow path 11-1 is provided in the roll main body so as to be inclined with respect to the roll axis, and the same flow rate adjusting plate 12 is attached to both end faces of the roll. It has a structure. The inclined flow path 11-1 is provided on a concentric circle so that one end is opened near the roll surface layer and the other end is opened near the roll center. In the case of the porous roll with inclined channels, as in the above case, the cooling medium or the heating medium flows in from the channel 11-2 of the roll shaft portion and flows through the inclined channel 11-1 of the roll body portion. Adjustment plate 1
When 2 is located in the lower half of the roll, the fluid flows more in the upper half of the roll and less in the lower half of the roll, and when the flow regulating plate 13 is located in the upper half of the roll,
Fluid flows more in the lower half of the roll and less in the lower half.

The porous roll 1 shown in FIGS.
1 is a flow path provided in the roll main body, and a bent inclined flow path 11-
1 and a structure in which the same flow rate adjusting plate 12 as described above is attached to both end faces of the roll. The bent inclined flow path 11-1 is provided with openings on both ends of the roll on concentric circles near the roll axis,
The middle part of the flow path located in the axial center part of the roll body is located on a concentric circle near the surface layer of the roll,
In the case of the porous roll 11 with the bent inclined flow path 11-1, the cooling medium or the heating medium flows in from the flow path 11-2 of the roll shaft portion and the bent inclined flow path 11- 1, but in the case of a curved inclined flow path, it is effective to further cool or heat the vicinity of the surface layer of the roll.

In the case of a porous roll with a flow rate adjusting jig of the automatic opening and closing type shown in FIGS. 6 and 7, the temperature of the roll is constantly measured, and the measured temperature is converted into an electric signal to convert the electromagnet 1 into an electric signal.
Since it is more effective to control 5-6, as shown in FIG.
6-2 is incorporated in the roll. When this temperature measuring device is used for a sleeve roll, the temperature can be measured without adversely affecting the temperature measuring section even when the roll sleeve 11-4 changes its relative position to the arbor (core material) 11-3 due to thermal expansion. Next, the temperature measuring device 16-1 is set along the sleeve, and the temperature measuring device 16-2 is installed on the arbor 11-3.

Example 1 FIG. 14 shows the results of investigation of the roll surface temperature when the porous roll having the structure shown in FIGS. 1, 2 and 3 was used as a supporting and cooling roll for a high-temperature steel material. 15A is a conventional roll, and FIG. 15B is a roll surface temperature distribution diagram of the porous roll of the present invention. This data indicates that the transport speed is Vc = 0.005 m / mi so that the roll temperature difference appears extremely.
This is the result when n is made very slow.

As is clear from FIG. 14, the roll of the present invention has a surface temperature which is reduced by 205 ° C., and the temperature difference in the roll is greatly reduced from 608 ° C. of the conventional roll to 366 ° C. Therefore, the thermal stress and thermal deformation generated in the roll are reduced to 1 / 1.5 or less, and the quality is improved because the high-temperature steel is also cooled substantially uniformly. Further, it is possible to reduce the amount of spray water and air used for cooling the steel material. These effects become more remarkable in the case of a porous roll with an automatic opening / closing type flow rate adjusting jig (see FIGS. 6 and 7) which can adjust the flow rate while measuring the roll temperature.

In the above embodiment, a porous roll is used as a cooling roll, but it goes without saying that the same effect can be obtained by using a porous roll as a heating roll. Needless to say, the same effect can be obtained in the case of a porous roll with an inclined flow path.

[0029]

As described above, this invention can reduce the non-uniformity of the temperature distribution of the roll due to the presence or absence of contact with a high-temperature object or a low-temperature object without increasing the amount of cooling medium or heating medium used. In addition, it is possible to reduce and uniformize the thermal stress and thermal deformation generated in the roll, thereby prolonging the life of the roll and minimizing the adverse effect on the contact object.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an example of a perforated roll according to claim 1 of the present invention.

FIG. 2 is a vertical sectional front view taken along line AA of FIG. 1;

FIG. 3 is a view corresponding to a vertical section taken along line AA of FIG. 1 showing another example of the flow rate adjusting jig according to the present invention.

FIG. 4 is a longitudinal sectional view taken along the line AA of FIG. 1 showing another example of the flow rate adjusting jig according to the present invention.

FIG. 5 is a schematic front view showing an example in which the porous roll shown in FIGS. 1 to 3 is used as a pair of upper and lower high-temperature steel material conveying rolls.

FIG. 6 is a side view showing an example of an automatic opening / closing type flow adjusting jig according to the present invention.

FIG. 7 is a front view of the flow control jig of the automatic opening and closing system according to the first embodiment;

FIG. 8 is a longitudinal sectional view taken along the line AA of FIG. 1 showing another example of the perforated roll according to claim 1 of the present invention.

FIG. 9 is a vertical sectional side view showing an example of a perforated roll according to claim 2 of the present invention. Nu

FIG. 10 is a vertical sectional front view taken along line AA of FIG. 9;

FIG. 11 is a longitudinal sectional side view showing another example of the multi-aperture roll according to claim 2 of the present invention.

FIG. 12 is a vertical sectional front view taken along line AA of FIG. 11;

FIG. 13 is a schematic view showing an example of a perforated roll incorporating a temperature measuring device according to claim 3 of the present invention.

FIG. 14 is a diagram showing actual measured values of the roll surface temperature in the embodiment of the present invention.

FIG. 15 illustrates a conventional roll with a flow path,
(A) is a roll having a flow path at the center of the roll, (B) is a roll having a spiral flow path inside the roll, (C) is a flow path inside the roll, and a roll having a slit on the outer peripheral surface of the roll. It is a longitudinal side view shown.

FIG. 16 is a view showing an example of roll temperature measurement of a conventional roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Multi-hole roll 11-1, 11-2 Flow path 12, 13, 14 Flow control plate 15 Flow control jig 16-1, 16-2 Temperature measuring device 17 High temperature steel

Claims (2)

(57) [Scope of request for utility model registration] 1. A roll having a plurality of flow paths parallel to the roll axis on a concentric circle in the vicinity of a roll surface layer portion, wherein the number of closing or narrowing the plurality of flow paths at both ends of the roll body is determined.
A porous roll provided with a flow rate adjusting jig for adjusting a flow rate. Wherein a plurality of inclined channel in the roll axial direction in the roll main body, the plurality of the both ends of the roll body portion
Adjust the flow rate by closing or narrowing the flow path
Perforated rolls, characterized in that arranged the flow rate adjusting jig to perform.