JP2004181506A - Wiper device and wiping method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper device and a wiping method by which excellent wiping performance is displayed under wide rolling conditions from a low speed to a high speed by finding suitable shape conditions of wiper rolls supported with gas bearings. <P>SOLUTION: In wiper devices 5a, 5b for removing liquid on the surface of a strip 1, this device is provided with the wiper rolls 21a, 21b which are formed so that the value d/L of the roll diameter d to the roll length L of the roll is in the range of 0.02≤d/L≤0.05 and gas bearings 22a, 22b with which these wiper rolls 21a, 21b are boren with supplied gas and the wiper rolls 21a, 21b are pressed against the surface of the strip 1. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wiper apparatus and a wiping method for supporting a wiper roll with a gas bearing and pressing the wiper roll against the surface of a plate material to remove liquid adhering to the surface of various plate materials. For example, the present invention relates to a metal plate material (strip, rolled material) rolled by a rolling mill. The present invention relates to a wiper device and a wiping method for removing rolling oil and the like attached to a surface.
[0002]
[Prior art]
For example, in a rolling operation or the like, in order to reduce the frictional force between a metal plate (strip, rolled material) and a rolling work roll, or to supply rolling lubricating oil at least on the rolling mill entry side for cooling the work roll, etc. After rolling, a large amount of lubricating oil adheres to the sheet surface. The wiper device (water draining device) is provided to remove liquid such as rolling lubricating oil adhering to the surface of the plate material, and finally removes the liquid on the surface of the plate material, so that the plate material is finally wound into a coil shape. The roll plays an important role in stabilizing the rolling operation by preventing the occurrence of winding deviation (so-called telescopic) at the time of occurrence and the reduction of the coefficient of friction between the pride roll and the plate material when the pride roll is provided. Fulfill.
[0003]
As the wiper device, as shown in FIG. 7, for example, a tube type device in which a rubber tube 50 gripped by a holder 51 is brought into contact with the surface of a conveyed plate (strip) 1 or a rotatable wiper roll is used as a plate material. There is a roller type that rolls on the surface. The tube-type wiper device generally exhibits good wiping performance (water drainage performance) because the tube deforms and follows the fluctuation of the plate thickness. However, the frequency of tube replacement due to wear is high. In particular, when the plate passing speed reaches a high-speed range, the tube surface becomes rough due to intensified wear and the surface quality of the plate is reduced. In some cases, the distribution of the residual oil amount becomes uneven, which may hinder the subsequent process. Therefore, there is a limit to the use of the tube-type wiper device under high-speed rolling conditions, and generally, it is suitable for use under high-speed rolling conditions when wide rolling conditions from low speed to high speed are assumed. Roller-type wiper devices are often used.
[0004]
Here, it is generally known that the smaller the roll diameter of the wiper roll, the better the wiping characteristics. Conventionally, in a roller type wiper device, a configuration in which a wiper roll supported at both ends by a bearing is pressed against the surface of a plate material is generally used.In this case, if the diameter of the wiper roll is too small, the deflection of the wiper roll due to a reaction force from the plate material increases. In addition, a minute gap is formed between the wiper roll and the plate material surface, and the wiping performance tends to be reduced. For this reason, there is a limit in reducing the diameter of a wiper roll supported by a bearing from the viewpoint of rigidity, and as a result, the actual wiping performance of a tube-type wiper device cannot be exhibited. Therefore, in recent years, in order to solve this problem, a roller-type wiper device that supports the wiper roll using a gas bearing has been proposed (for example, see Patent Document 1).
[0005]
[Patent Document 1]
JP-A-1-148413
[0006]
[Problems to be solved by the invention]
In the above prior art, the gas bearing supplies the gas to the entire length of the wiper roll or a portion corresponding to the plate width of the plate material to support the wiper roll, so that a substantially uniform load is applied to the wiper roll by the gas. It becomes. As a result, in the wiper roll supported by the gas bearing, the occurrence of bending is suppressed as compared with the wiper roll supported by the bearing, so that the diameter can be further reduced.
[0007]
However, it is desirable that the roll diameter of the wiper roll be as small as possible.Even with a wiper roll supported by a gas bearing, not only the wiping performance but also the wiper roll due to problems in workability, bending characteristics, rolling operation, etc. There are various restrictions on the roll diameter.
[0008]
An object of the present invention is to find a suitable shape condition of a wiper roll supported by a gas bearing, and to provide a wiper device and a wiping method capable of exhibiting good wiping performance under wide rolling conditions from low speed to high speed. .
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a wiper device according to the present invention is a wiper device for removing a liquid on a surface of a plate material, wherein a value of roll diameter d / roll length L is in a range of 0.02 to 0.05. A wiper roll; and a gas bearing for supporting the wiper roll with a gas supplied thereto and pressing the wiper roll against the plate material. However, the gas bearing may further include gas supply width adjusting means for adjusting the gas supply range in the plate material width direction.
[0010]
In the present invention, preferably, the gas supply range of the gas bearing is set to be equal to or greater than the plate width of the plate material, and the wiper roll is formed so as to decrease in diameter from the center of the roll diameter d toward both ends. In addition, the gas supply range of the gas bearing is set to be equal to or greater than the plate width of the plate material, and the wiper roll is formed to have the same diameter by the set length with the roll diameter d, and both ends of the same diameter portion. It may be formed of a tapered portion provided and reduced in diameter toward the tip.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a wiper device of the present invention will be described with reference to the drawings.
FIG. 1 is an overall view showing a schematic configuration of a rolling facility to which an embodiment of a wiper device of the present invention is applied.
The rolling equipment of FIG. 1 is a reversible rolling equipment in which a strip (plate material) 1 is reciprocated a plurality of times to a pair of upper and lower work rolls 2a and 2b and directly rolled. Each mechanism is provided substantially symmetrically with respect to the work rolls 2a and 2b (left and right in FIG. 1). That is, on both sides of the work rolls 2a, 2b, oil supply pipes 3a, 3b for injecting a rolling lubricant (coolant) to the work rolls 2a, 2b in order from the work rolls 2a, 2b, and the upstream wiper device 4a, 4b, downstream-side wiper devices 5a, 5b, deflector rolls 6a, 6b, each of which is a pair of two deflector rolls that change the direction of passing the strip 1, and a reel 7a that winds and unwinds the strip 1. , 7b.
[0012]
The pair of upper and lower work rolls 2a and 2b is for directly rolling by pinching and rotating the strip 1, and is supported in a vertical direction by a pair of upper and lower intermediate rolls 8a and 8b and a pair of upper and lower reinforcing rolls 9a and 9b. It constitutes a part of a six-high rolling mill. The work roll 2b is rotationally driven by a rolling mill motor 10, and the power is also transmitted to the work roll 2a via gears 11a and 11b. Although not shown in detail for the purpose of preventing complication, the work rolls 2a and 2b, together with the intermediate rolls 8a and 8b and the reinforcing rolls 9a and 9b, are connected to the housing 12 at both ends via roll chocks (not shown). It is supported, and the distance from the strip 1 is adjusted by raising and lowering each other's roll chocks by a hydraulic cylinder (not shown).
[0013]
The oil supply pipes 3a and 3b are provided on both sides of the work rolls 2a and 2b, respectively, and supply rolling lubricating oil guided from a supply device (not shown) to the body surfaces of the work rolls 2a and 2b, respectively. The friction between the strips 2a and 2b and the strip 1 is reduced, and the rise in the surface temperature of the work rolls 2a and 2b is suppressed. Therefore, the rolling lubricating oil 13 supplied from the oil supply pipes 3a and 3b adheres to the surface of the strip 1 after rolling.
[0014]
FIGS. 2A and 2B are schematic views of the upstream wiper devices 4a and 4b in the vicinity of the strip 1 as viewed from the direction in which the strip 1 passes and the width of the strip 1, respectively. As shown in FIG. 1 and FIGS. 2A and 2B, the upstream-side wiper devices 4a and 4b are roller-type wiper devices having a pair of upper and lower wiper rolls 15a and 15b, respectively. The upper and lower wiper rolls 15a and 15b are pressed and held on the strip 1 to be rolled, and the rolling lubricating oil attached to the surface of the strip 1 is removed by rolling. At this time, the upstream wiper devices 4a and 4b generally remove (roughly cut) the rolling lubricating oil on the surface of the strip 1 before the downstream wiper devices 5a and 5b, and the wiper rolls 15a and 15b are moved downstream. The diameter is larger than that of the wiper devices 5a and 5b.
[0015]
As shown in FIG. 2A, both ends of the wiper rolls 15a and 15b are rotatably supported by bearings 16a and 16b attached to upper and lower roll chocks (not shown). The upper and lower roll chocks are respectively attached to the rod ends of the hydraulic cylinders 17a and 17b shown in FIG. 1, and move up and down as the rods advance and retreat, so that the distance between the wiper rolls 15a and 15bb and the strip 1 is adjusted. The pressing force of the strips 15a and 15b against the strip 1 is adjusted. The hydraulic cylinders 17a and 17b expand and contract when pressure oil from the hydraulic pump 18 is switched and supplied to the bottom or rod side chamber via the control valves 19a and 19b. As the control valves 19 a and 19 b, for example, a three-position switching type electromagnetic proportional valve or the like is used, and operates in response to a command signal from the controller 20.
[0016]
FIGS. 3A and 3B are schematic views of the vicinity of the strip 1 of the above-mentioned downstream-side wiper devices 5a and 5b, respectively, as viewed from the direction in which the strip 1 passes and the direction in which the strip 1 passes. As shown in FIG. 1 and FIGS. 3 (a) and 3 (b), the downstream-side wiper devices 5a, 5b are wiper devices of a static pressure gas bearing support structure, and each of a pair of upper and lower wiper rolls 21a, 21b is provided. A static pressure gas bearing 22a, 22b supporting the wiper rolls 21a, 21b; and a gas supply width adjusting device 23a, 23b for adjusting the gas supply range in the plate width direction of the strip 1 of the static pressure gas bearing 22a, 22b. And hydraulic cylinders 24a and 24b for moving the static pressure gas bearings 22a and 22b up and down with respect to the strip 1. In particular, in the present embodiment, the wiper rolls 21a and 21b are formed such that the ratio d / L of the roll diameter d to the roll length L satisfies 0.02 ≦ d / L ≦ 0.05.
[0017]
The inner peripheral surfaces of the static pressure gas bearings 22a and 22b are formed in a semi-cylindrical shape, and the wiper rolls 21a and 21b are loosely fitted on the inner peripheral surfaces. On the inner peripheral surfaces of the static pressure gas bearings 22a and 22b, there are provided a large number of orifices 25 formed in the circumferential direction at a constant pitch in the axial direction, for example, by a compressor (not shown). The compressed air supplied to the flow path 26 is injected through the orifices 25 to the body of the wiper rolls 21a and 21b. As a result, the wiper rolls 21a, 21b are floated from the inner peripheral surfaces of the hydrostatic gas bearings 22a, 22b, are supported in a non-contact state by compressed air, and their body portions are pressed against the surface of the strip 1 so that the wiper rolls 21a, 21b are pressed. The rolling lubricant 21b removes the rolling lubricant remaining on the surface of the strip 1 while rolling on the strip 1.
[0018]
The gas supply width adjusting devices 23a and 23b include a plurality of (eight in this example) adjusting rods 27 fitted on both sides of each gas flow path 26 in the axial direction (left and right directions in FIG. 3A), and a rod tip. A plurality of (eight in this example) hydraulic cylinders 28 are connected to each adjusting rod 27 and slide each adjusting rod 27 in the gas flow path 26 in the axial direction. As a result, each adjusting rod 27 is moved within the gas flow path 26, and the width of the air supply region (gas supply area) determined by the distance between the opposing end faces of the adjusting rods 27, 27 facing each other in each body flow path 26. Width) can be adjusted according to the plate width of the strip 1. Although not particularly shown, the driving source of each hydraulic cylinder 28 may be pressure oil from the hydraulic pump 18, and the expansion and contraction operation may be controlled by a command from the controller 20, for example. That is, similarly to the above-described hydraulic cylinders 17a and 17b, for example, the control valve may be operated by a command from the controller 20 to supply or shut off the pressure oil to the bottom side or the rod side chamber to the hydraulic cylinder 28.
[0019]
The hydraulic cylinders 24a and 24b are provided with static pressure gas bearings 22a and 22b at the tip of each rod, and move the static pressure gas bearings 22a and 22b up and down as the rods advance and retreat, whereby the wiper rolls 21a and 21b and the strip 1 are moved. Are adjusted so that the pressing force of the wiper rolls 21a and 21b against the strip 1 can be adjusted. As shown in FIG. 1, the hydraulic cylinders 24a and 24b expand and contract when pressure oil from the hydraulic pump 18 is supplied to the bottom or rod side chamber via the control valves 29a and 29b. Has become. Although not shown in detail for the purpose of preventing complexity, the control valves 29a and 29b are, for example, three-position switching type electromagnetic proportional valves similarly to the above-described control valves 19a and 19b, and are input from the controller 20 to the solenoid. The direction (or the direction and the flow rate) of the hydraulic oil from the hydraulic pump 18 is controlled by switching according to the command signal.
[0020]
Returning to FIG. 1, the reels 7a and 7b are respectively located at the front and rear ends (left and right ends in FIG. 1) of the pass line of the rolling equipment, and are driven to rotate by the reel drive motors (not shown), respectively. The strip 1 rolled by 2b is wound or unwound in a coil shape. That is, when the passing direction is the right direction in FIG. 1, the strip 1 is unwound from the reel 7b, rolled and wound on the reel 7a, and thereafter, when the passing direction becomes the left direction in FIG. The strip 1 is unwound from the reel 7a, is further rolled, and is wound on the reel 7b.
[0021]
When the strip 1 rolled by the work rolls 2a and 2b is directly wound on the reel 7a or 7b, the diameter of the strip coil wound on the reel 7a or 7b gradually increases with the progress of the rolling operation. The positional relationship between the rolling position by the rolls 2a and 2b and the winding / unwinding position by the reels 7a and 7b changes, but the deflector rolls provided between the work rolls 2a and 2b and the reels 7a and 7b, respectively. By 6a and 6b, the above positional relationship is adjusted to be constant regardless of the diameter of the strip coil. Although not particularly shown to prevent complication, the reels 7a and 7b are controlled at a predetermined rolling speed to control the rotation speed of the reels 7a and 7b in accordance with a change in the diameter of the rolled material coil. A device is provided for each.
[0022]
In the rolling equipment having the above configuration, when starting the rolling operation, first, the work rolls 2a and 2b are separated from the pass line, the strip 1 is passed through, and the work rolls 2a and 2b are brought into contact with the strip 1. To reduce the pressure with a predetermined load. The work rolls 2a and 2b and the reels 7a and 7b are controlled by the rolling mill motor 10 and the reel drive motor (not shown) while controlling the rotation speed by the controller 20 based on the detection value of the speed detector. When driven to rotate, the strip 1 is passed through the work rolls 2a and 2b while being given a constant tension by the reels 7a and 7b, and is rolled. At this time, in order to suppress the temperature rise of the work rolls 2a, 2b and the friction between the work rolls 2a, 2b and the strip 1, the oil supply pipes 3a, 3b are rolled from the oil supply pipes 3a, 3b to the outlet side and the inlet side of the work rolls 2a, 2b. Supply lubricating oil. As a result, after rolling, the surface of the strip 1 becomes slippery, and a so-called telescopic phenomenon easily occurs on the reel 7a (or 7b). To prevent this, rolling lubricating oil adhering to the surface of the strip 1 is removed. It is roughly cut by the upstream wiper device 4a (or 4b), and is further removed by a downstream wiper device 5a (or 5b) to an allowable value or less.
[0023]
Here, the wiping characteristics of the roller type wiper device will be described.
In a roller-type wiper device, it is generally known that the residual oil amount on the strip surface after wiping decreases as the roll diameter decreases, as can be seen from the following equation.
h2 = K · (d · ν · V) / 2P
Here, h2: residual oil film thickness, K: proportional constant, d: wiper roll diameter, ν: lubricating oil viscosity, V: threading speed, P: wiper roll pressing force.
[0024]
However, in the case of a wiper roll supported at both ends by bearings, such as the wiper rolls 15a and 15b of the above-mentioned upstream wiper devices 4a and 4b, when the roll diameter d is to be reduced, the strip when sandwiching the strip is removed. , The deflection of the wiper roll tends to increase. Therefore, when a wiper roll having an extremely small diameter is used, a minute gap is generated between the wiper roll and the strip, and a pressure distribution (a pinching pressure distribution) from the wiper roll in the strip width direction becomes non-uniform. On the contrary, it results in a decrease.
[0025]
On the other hand, in the case of a wiper roll supported by a hydrostatic gas bearing, such as the wiper rolls 21a and 21b of the above-mentioned downstream wiper devices 5a and 5b, usually, a range of about the entire length of the gas bearing or the plate width of the strip is used. Since the gas is supplied to the wiper roll and the wiper roll is supported with an evenly distributed load, the pressure distribution becomes uniform, so that the bending is suppressed, so that the diameter of the wiper roll can be easily reduced. Thus, by using the wiper roll having a smaller diameter than the wiper roll supported at both ends, the wiper device having the gas bearing support structure can exert the wiping performance more effectively than the roller type wiper device having the bearing support structure. Further, since the deflection of the wiper roll can be suppressed to a small value, there is a characteristic that the residual oil amount in the width direction of the strip plate after wiping can be made uniform.
[0026]
However, although the wiper roll preferably has a smaller diameter as much as possible, even in the case of a wiper device having a gas bearing support structure, the reduction in the diameter of the wiper roll is actually limited to a range satisfying the following conditions. Become.
{Circle around (1)} The wiper roll and the gas bearing are within the range that can be machined.
{Circle around (2)} This is a range in which uniform widthwise wiping characteristics can be obtained.
(3) The range where stable rolling operation can be performed.
And so on.
[0027]
First, from the viewpoint of the above condition (1), for example, a wiper roll or the like may be subjected to lathe processing. However, if the roller diameter is too small with respect to the roller length, the wiper roll is largely bent as it moves away from the chuck (gripping portion). Cutting becomes difficult, and if the diameter is to be significantly reduced, the cutting itself of the cutting tool (cutting blade) becomes difficult. As a result of actually producing a gas bearing and a wiper roll, when the ratio d / L between the roll diameter d and the roll length L of the wiper roll is less than 0.02 (d / L <0.02), the work material (wiper roll or It has been found that bending occurs in the gas bearing), and the required processing accuracy cannot be substantially obtained. Also from the viewpoint of the above (3), it has been found that the wiper roll has an excessively small diameter, which is not desirable. Therefore, the present inventors have determined that 0.02 is appropriate as the lower limit of the value of d / L in the wiper roll.
[0028]
FIG. 4 shows a calculation result of the bending shape of the wiper roll of each roll diameter with respect to the wiper roll on the lower side of the strip as a result of the examination regarding the viewpoint (2). First, with reference to the curves a, b, and c in FIG. 4, when the gas supply range is equal to or greater than the strip plate width, the roll diameter of the wiper roll will be examined. However, the curves a to c shown in FIG. 4 indicate that the roll length L is 1200 [mm] under the condition that the supply range of the gas (air) of the gas bearing is the same as the strip plate width (= 800 [mm]). ] Are calculated by sequentially changing the roll diameter d of the wiper roll.
[0029]
As shown in FIG. 4, under the condition of 0.02 ≦ d / L ≦ 0.03, the bending shape (curve) of the wiper roll can be theoretically approximated by a sixth-order function as represented by the curve a, and the sheet width ( In the range of -400 to 400 [mm]), the surface becomes substantially flat except for the vicinity of the end (-400, 400 [mm] position) of the range. This means that the pressure (clamping pressure) exerted on the strip from the wiper roll is substantially uniform in the plate width direction.
Subsequently, under the condition of 0.03 ≦ d / L ≦ 0.05, the bending shape of the wiper roll can be approximated by a quartic function as represented by the curve b, and the aforementioned 0.02 ≦ d / L ≦ 0. In comparison with the case of No. 03, it can be seen that the position at which the deflection starts to be slightly closer to the center, and the flat area decreases accordingly, but the pressure exerted on the strip from the wiper roll is still relatively uniform in the width direction of the plate.
However, when the condition of d / L> 0.06 is satisfied, the wiper roll has a bent shape that can be approximated by a substantially quadratic function as shown by a curve c, and a bend has already occurred from the center position, and especially near the center portion. The gap between the strip 1 and the strip 1 increases. As a result, under the condition of d / L> 0.06, the distribution of the pinching pressure of the wiper roll on the strip in the plate width direction becomes uneven, and the residual oil amount on the strip surface also becomes uneven.
[0030]
On the other hand, when the gas supply range is narrower than the plate width (800 [mm] in this case), the bending shape of the wiper roll is reversed (the center is closer to the strip, and the gap between the strip increases as the distance to both ends increases). If d / L is the same, the way of bending is almost the same as that of the curves a to c described above. In FIG. 4, as an example, when 0.03 ≦ d / L ≦ 0.05, the bending shape when the gas supply width is smaller than the plate width (800 [mm]) is represented by a curve a ′. When comparing the shape of the curve a ′ with the curve a calculated under the same d / L condition, the bending direction of the bending differs depending on whether the gas supply range is equal to or larger than the plate width or smaller than the plate width. It can be seen that the manner of bending is almost the same as the tendency. Therefore, even when the gas supply width is smaller than the plate width, the condition of d / L can be applied as it is, as in the case of gas supply width ≧ plate width.
[0031]
As a result of FIG. 4 described above, from the viewpoint of the uniformity of the wiping, it is considered that the upper limit of the roll diameter d / the roll length L is about 0.05, which can provide a relatively uniform pressure distribution in the plate width direction. When integrated with the lower limit previously set from the viewpoint of workability and rolling operation, the appropriate value of the roll diameter of the hydrostatic gas bearing support type is such that the ratio d / L to the roll length is 0.02 ≦ d / L. It has been found that a suitable wiping performance can be exhibited by adopting a wiper roll having a shape satisfying this condition, given as a range of L ≦ 0.05.
[0032]
Further, even if the same wiper roll is used, the bending shape differs depending on the width of the strip to be passed. In FIG. 5, for example, using a wiper roll having a length of 1200 [mm] formed so that d / L = 0.03, the width of the strip to be passed is 400 [mm], 800 [mm], 1000 [mm]. ] When the wiper roll is bent. Referring to FIG. 5, when the strip plate width is extremely narrow, 400 [mm], the bending shape of the wiper roll is approximated by a quadratic function, but when the strip plate width becomes 800 [mm], the wiper roll is deformed. Is approximated by a quartic function, and when the width of the strip plate is further increased to 1000 [mm], the bending shape of the wiper roll approaches a cubic function. That is, from this point, if a wiper roll having a roll diameter set to be in the range of 0.02 ≦ d / L ≦ 0.05 is used, even if the strip width of the strip is variously changed, it is most necessary as a steel sheet material. In wiping a strip having a large width, the bending shape of the wiper roll is generally in a range approximated by a fourth-order function to a sixth-order function, and it can be seen that substantially uniform wiping characteristics can be obtained. In FIG. 5, as in FIG. 4, it is assumed that the gas supply range = the plate width. However, as described above, the gas supply range> the plate width, and the gas supply range <the plate width, although the bending directions are different. Also in this case, the bending shape is the same as the tendency, and the same can be said.
[0033]
As described above, according to the present embodiment, in the roller-type wiper device capable of wiping the liquid adhered to the strip surface under a wide range of rolling conditions from low speed to high speed, the roll diameter of the wiper roll supported by the gas bearing is preferably adjusted. (That is, the above-mentioned 0.02 ≦ roll diameter d / roll length L ≦ 0.05) provides good wiping performance having uniformity in the width direction of the strip in all regions from the low speed region to the high speed region. Can be secured. Thereby, a process after wiping, such as a strip winding operation, can be performed smoothly, which contributes to a stable operation of the rolling operation.
[0034]
Next, another embodiment of the wiper device of the present invention will be described.
FIGS. 6A and 6B are diagrams schematically illustrating the wiper roll and the gas bearing used in the wiper device according to the present embodiment, as viewed from the strip passing direction. However, FIGS. 6 (a) and 6 (b) show only the wiper roll and its gas bearing arranged below the strip. This embodiment has a configuration similar to that of the previous embodiment except that a wiper roll 21A (or 21B) whose diameter is reduced toward both ends is used.
[0035]
The wiper roll 21A shown in FIG. 6A is formed so that the contour of the trunk in the axial cross section is approximated by a quadratic curve, and the diameter is reduced toward both ends with the center as a boundary. On the other hand, the wiper roll 21B shown in FIG. 6B has the same diameter portions 21Ba formed to have substantially the same diameter by the set length, and is provided at both ends of the same diameter portions 21Ba, and each of the diameters is reduced toward the tip. It is formed by the tapered portion 21Bb. However, in these wiper rolls 21A and 21B, the maximum diameter (both at the center) d is also 0.02 ≦ d / L ≦ 0.05 with respect to the total length L of wiper rolls 21A and 21B in the present embodiment. Is set to be within the range.
[0036]
This embodiment is particularly effective when the gas supply width is set to be larger than the strip width, as shown in FIGS. 6A and 6B. When the pressure from the wiper roll (nipping pressure) acting near the center of the strip becomes relatively weak, the distribution of the nipping pressure between the strip and the wiper roll is made more uniform. For example, the gas supply width = strip plate The effect is exhibited even under conditions such as the width.
[0037]
For example, in the case of the wiper roll 21A of FIG. 6A, the gas pressure distribution in the gas bearing 22 within the gas supply width is highest at the center, and gradually decreases as the distance from the center increases. Originally, when the gas supply width> the strip plate width, the pressing force of the wiper roll 21A against the strip 1 is lower near the center of the strip 1 than near both ends in the width direction. , And the gas pressure acting on the wiper roll 21A is gradually decreased as the distance from the center increases, whereby the bending of the wiper roll 21A is suppressed. Further, the slight deflection of the wiper roll 21A and the shape of the wiper roll 21A cancel each other, and the distribution of the pressure (nipping pressure) in the width direction of the wiper roll 21A with respect to the strip 1 is further uniformed. The same can be said for the wiper roll 21B in FIG. 6B. Also in the present embodiment, the same effect can be obtained, and excellent wiping performance in which the residual oil amount distribution in the strip plate width direction is more uniform can be secured.
[0038]
In the present embodiment, the wiper roll 21A in which the cross-sectional profile of the body is approximated by a quadratic curve and the wiper roll 21B having the body diameter portion 21Ba and the tapered portion 21Bb are illustrated, but the central portion is defined as the maximum diameter d. , 0.02 ≦ d / L ≦ 0.05, as long as the diameter is reduced from the center toward both ends, substantially the same effect can be obtained without being limited to the wiper rolls 21A and 21B. Can be.
[0039]
Further, in both of the above embodiments, air is exemplified as the gas used in the gas bearing 22, but the gas is not limited to this, and any gas according to this may be used. In addition, the example in which the present invention is applied to the reversible rolling equipment capable of passing the sheet in both directions has been described. However, the present invention can be applied to a rolling equipment in which the sheet is passed only in one direction. Although the rolling equipment provided with the intermediate rolls 8a and 8b and the reinforcing rolls 9a and 9b has been illustrated as a means for reinforcing the work rolls 2a and 2b, the intermediate rolls and the reinforcing rolls are not necessarily required, and they are provided. The present invention is applicable to rolling equipment that does not have the same. Further, the present invention is also applicable to a multi-stage rolling facility provided with a plurality of sets of work rolls. Further, in the present embodiment, the application example of the present invention to the rolling equipment has been described. However, the present invention is not necessarily limited to the removal of the liquid on the strip surface in the rolling equipment, and the present invention is applicable to other types of equipment. It can be applied for the purpose of removing a liquid such as oil remaining on the surface of the substrate.
[0040]
【The invention's effect】
According to the present invention, in a wiper roll supported by a gas bearing, a roll diameter set to a preferable ratio with respect to the roll length is established, and a wiper device having the wiper roll having the shape is used, so that the wiper roll extends from a low speed region to a high speed region. In the entire region, uniform wiping performance can be ensured in the width direction of the plate material. Further, the wiper roll is formed in a shape in which the diameters of both ends are reduced with respect to the diameter at the center, and the gas supply width of the gas bearing is set to be equal to or greater than the plate width of the plate material, so that more uniform wiping characteristics in the plate width direction are obtained. be able to. Thereby, the production efficiency in the rolling operation can be significantly improved.
[Brief description of the drawings]
FIG. 1 is an overall view showing a schematic configuration of a rolling facility to which an embodiment of a wiper device of the present invention is applied.
FIG. 2 is a diagram of a portion near an strip of an upstream wiper device provided in a rolling facility to which an embodiment of the wiper device of the present invention is applied, as viewed from the direction in which the strip passes, and schematically viewed from the direction of the width of the strip. FIG.
FIG. 3 is a view of a portion near a strip of a downstream-side wiper device provided in a rolling facility to which an embodiment of the wiper device of the present invention is applied, as viewed from the direction in which the strip passes, and schematically as viewed from the width direction of the strip. FIG.
FIG. 4 is a diagram illustrating a calculation result of a bending shape of a wiper roll of each roll diameter.
FIG. 5 is a diagram illustrating a bent shape of a wiper roll when a width of a strip to be passed is changed.
FIG. 6 is a diagram schematically illustrating a wiper roll and a gas bearing used in another embodiment of the wiper device according to the present invention when viewed from a strip passing direction.
FIG. 7 is a diagram illustrating a schematic configuration of a conventional tube-type wiper device.
[Explanation of symbols]
1 strip (plate material)
5a, b Downstream wiper device (wiper device)
21a, b Wiper roll
21A, B Wiper roll
21Ba same diameter part
21Bb taper part
22a, b gas bearing
23a, b Gas supply width adjustment device (gas supply width adjustment means)
d Maximum roll diameter
L Roll length

Claims (6)

In a wiper device that removes liquid adhering to the plate material surface,
A wiper roll formed such that the ratio of the roll diameter to the roll length is 0.02 to 0.05,
A wiper device comprising: a gas bearing that supports the wiper roll with a supplied gas and presses the wiper roll against the plate material. In a wiper device that removes liquid adhering to the plate material surface,
A wiper roll formed such that the ratio of the roll diameter to the roll length is 0.02 to 0.05,
A gas bearing for supporting the wiper roll against the plate by supporting the gas with the supplied gas,
A wiper device comprising: a gas supply width adjusting means for adjusting a supply range of the gas in the plate material width direction of the gas bearing. 3. The wiper device according to claim 1, wherein a gas supply range of the gas bearing is set to be equal to or greater than a plate width of the plate material, and a ratio of the wiper roll to a roll length is 0.02 to 0.05. 4. A wiper device characterized in that the diameter is reduced from a central portion formed by a roll diameter toward both ends. 3. The wiper device according to claim 1, wherein a gas supply range of the gas bearing is set to be equal to or greater than a plate width of the plate material, and a ratio of the wiper roll to a roll length is 0.02 to 0.05. 4. A wiper device comprising: a same-diameter portion formed to have substantially the same diameter by a set length in a roll diameter; and tapered portions provided at both ends of the same-diameter portion and each tapering toward a tip. Using a gas bearing, the wiper roll formed so that the ratio of the roll diameter to the roll length is 0.02 to 0.05 is supported by gas and pressed against the surface of the plate material to remove the liquid attached to the surface of the plate material. A wiping method characterized in that: The wiping method according to claim 5, wherein the wiper roll is formed so that a diameter with respect to a roll length is reduced from a central portion formed with a roll diameter of 0.02 to 0.05 toward both ends, and the wiper roll is formed by: A wiping method, characterized in that the gas bearing supplies gas to a range equal to or greater than the plate width of the plate material to support the bearing.

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