JP3224461B2 - Method for recovering drainage function of high-speed liquid suction roll and drainage device therefor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for recovering the drainage function of a high-speed liquid-absorbing roll (hereinafter referred to as a liquid-absorbing roll) used for high-speed, high-viscosity fluids, high hardness, and the like, and a liquid discharging device therefor. .

[0002]

2. Description of the Related Art A description will be given of a steel sheet process using a conventional vacuum suction roll (hereinafter, referred to as a conventional roll) at a high speed with reference to FIGS. 9 and 10. First, FIG. As described above, a conventional roll and, for example, a rubber roll (ordinary structure) are paired, and the roll diameter of the conventional roll is 250 mm, the vacuum value is −730 mmHg, and the rotation speed of the conventional roll is 1,275 rpm. . Assuming that the residual amount of the fluid on the upper surface of the steel sheet on the loading side (inlet side) of the steel sheet is 1 g / m 2, as shown in the figure, the generation of droplets is remarkable, and the fluid discharged from the conventional roll by vacuum suction is:
It becomes almost 0. 0.8 ~ on the exit side of the steel plate
0.9 g / m2. Therefore, it turns out that the vacuum suction / drainage function of the conventional roll does not work at all.

[0003] When the cause is investigated, FIG.
0, water film, layered water film, water wall (liquid film, layered liquid film, liquid wall), etc. due to the centrifugal force of a conventional roll that rotates at high speed (an example). It was found that a shielded watershed was formed, and the vacuum suction operation of the vacuum pump into the cavity did not function at all. Usually, such a situation is in the steel plate processing, the roll diameter of the conventional roll is φ250mm,
Vacuum value -730mmHg, Passing speed 800-850m / m
in (rotational speed of 1000 to 1100 rpm).

[0004]

As described above, in a conventional roll that rotates at a high speed, when a shielding basin is formed, the vacuum suction and drainage function of the conventional roll is almost completely lost, and as described above, Splashing on the loading side between incoming rolls, etc., and the need for reprocessing based on the reduced vacuum suction / drainage function significantly reduces the work capacity, complicates work, and causes many droplets on the steel sheet surface. It will remain and cause quality deterioration due to generation of residue marks and the like. Of course,
As described above, the same situation occurs when a high-viscosity fluid is processed or a high-hardness roll is used (hereinafter, a high-speed rotation liquid-absorbing roll will be described as a representative example).

[0005]

SUMMARY OF THE INVENTION According to the present invention, the generation of a shielded basin generated in the cavity of a liquid suction roll rotating at a high speed is achieved through nozzle suction, forced introduction of external gas, or accelerated suction by a venturi-shaped nozzle. And a method that can constantly maintain the vacuum suction and drainage function of the suction roll.

A first aspect of the present invention is a shaft main body having a through hole and a hollow portion, a roll main body provided in the shaft main body having a plurality of porous holes for performing a capillary action and a water absorbing action, and a communication hole of the shaft main body. A liquid film formed on the inner wall surface of the cavity, a layered water film, in a liquid discharging method for vacuum-suctioning and discharging a fluid of an object to be processed using a liquid absorbing roll provided with a vacuum connection piping system provided. A liquid absorbing roll configured to break a shielded basin such as a water wall by accelerated suction by intermittent forced introduction of an external gas, to open a through hole in the inner wall surface, and to recover a drainage function by vacuum suction. This is a drainage function recovery method.

Further, according to the present invention, it is possible to prevent the occurrence of a shielded basin generated in the cavity of the liquid absorbing roll rotating at a high speed.
Provided is a drainage device that can always maintain a drainage function by vacuum suction of a suction roll, or a method that can recover a drainage function by vacuum suction of a suction roll using the drainage device.

A second aspect of the present invention provides a shaft body having a through hole and a hollow portion, a roll body having a number of porous holes surrounding the shaft body, and a vacuum connection piping system provided in a communication hole of the shaft body. A method of recovering the drainage function of the suction roll, comprising: a suction roll provided with vacuum suction drainage configured as described above; and an external gas introduction pipe connected to a communication hole communicating with the cavity of the suction roll. It is a drainage device used for.

According to a third aspect of the present invention, there is provided a shaft body having a through hole and a cavity, a roll body having a number of porous holes surrounding the shaft body, and a vacuum connection piping system provided in a communication hole of the shaft body. A suction roll provided with vacuum suction and drainage, and an umbrella-shaped spacer provided at the converging portion of the cavity portion of the liquid absorbing roll, or a cavity portion provided with a converging portion provided at appropriate intervals. And a spacer core having a similar shape to the hollow portion and used in a method for restoring the drainage function of a corresponding suction roll.

A fourth aspect of the present invention is a method of recovering the drainage function of the suction roll by the drainage device used in the method of recovering the drainage function according to the third aspect, wherein the suction part is provided at the converging part of the hollow part of the suction roll. Umbrella-shaped spacers provided at appropriate intervals, or formed on the inner wall surface of the hollow portion using a spacer core similar to the hollow portion provided at an appropriate interval in the hollow portion provided with the converging portion. The drainage function recovery of the suction roll is configured to break the shielded water basin such as a water film to be formed, a layered water film, a water wall, etc., and to open a through hole in the inner wall surface to recover the drainage function by vacuum suction. Is the way.

[0011]

Next, the operation of the present invention (maintaining and recovering the vacuum suction / drain function) will be described.

For example, as shown in FIG. 8, a (conventional) rubber roll B and a (conventional) liquid absorbing roll A ′ (hereinafter simply referred to as a liquid absorbing roll) having a drainage function maintenance / recovery mechanism are provided. Are disposed, and a steel plate which has been treated with a chemical solution is passed (introduced) between the (conventional) rubber roll B and the (conventional) liquid absorbing roll A ′ (hereinafter, simply referred to as a pair of rolls). Then, the suction roll A in the operating state is subjected to a vacuum suction force, whereby the capillary action of the roll body (roll pad portion, pad surface) and the suction action excited by the vacuum action cause the inside of the roll body. The liquid sucked into the roll body is guided to the inside of the roll body by the suction action, and then guided to the cavity through a large number of through-holes formed in the shaft portion of the roll body, where the liquid is transiently and stably formed. A collected liquid storage state occurs. Under the condition that the normal balance relationship between the centrifugal force generated by the roll rotation acting on the transient liquid collecting reservoir and the vacuum suction force (that is, centrifugal force <vacuum suction force) is maintained,
Although the liquid collecting and storing section keeps a constant amount, the inflow and outflow are balanced, and the (conventional) suction roll A is connected via the communication hole of the shaft main body and the vacuum connection pipe system connected thereto. 'Drained (drained) outside.

[0013] The above-described operation is performed at a normal speed, for example, at a threading speed of 650 m / min (roll rotation speed of about 830 rpm), at a normal vacuum value, for example, -650 mmHg (vacuum value under operating conditions, the liquid absorbing state in the roll body). In the non-operating state, a high vacuum is shown as compared with the vacuum value due to the resistance of the liquid, etc.), and there is no need to operate the drainage function recovery mechanism. However, even under higher speed conditions, for example, a threading speed of 1000 m / min (roll rotation speed of about 1275 rpm), for example, a state where a relatively high vacuum value of about -730 mmHg is applied, a normal state (drainage) is performed. ) Maintenance becomes difficult, and the operation of the drainage function maintenance / recovery mechanism is inevitable.

As described above, under the condition of high-speed rotation, the normal functioning state which appears initially in the continuous processing state disappears transiently with the increase of the collected liquid storage amount, and the cavity is formed by the high-speed rotation. The centrifugal force acts on the liquid collection storage part sucked into the liquid storage part, so that a normal balance relationship between the centrifugal force acting on the liquid collection storage part and the vacuum suction force (that is, centrifugal force <vacuum suction force) Is not maintained, and a cylindrical liquid wall is generated on the inner wall surface of the cavity along the inner wall surface by centrifugal force. Obstructed (formation of a shielded water basin). In this way, when the through hole is closed by the stored liquid, a state in which the vacuum suction function of the vacuum pump to the roll body hardly functions is generated, and the movement of the liquid infiltrated inside the roll body is caused. Causes a state that is not excited, and presents a state close to the saturated state of the roll pad part seen in a general nonwoven fabric roll, and a water film, a layered water film, a shielded water basin such as a water wall (hereinafter simply referred to as a shield) on the inner wall surface. In this state, the drainage function by vacuum suction as the (conventional) suction roll A ′ is lost as described above.

Therefore, in the present invention, the external gas is forcibly introduced and supplied to the inside of the cavity where the liquid storage part which shifts to the state that induces the saturated state is formed before the liquid shielding basin is formed. Then, the expansion force of the gas in the vacuum region and the movement of the gas generated thereby, the accompanying transfer force of the fluid accompanying this, disrupt the behavior of the liquid storage part that moves to the shielding basin, and the accompanying transfer force of the fluid The liquid is discharged, the generation of a shielded basin for the liquid is inhibited, and a normal balance relationship between the centrifugal force and the vacuum suction force acting on the liquid storage liquid portion is maintained. Thereby, the generation of the shielded basin is prevented beforehand, and a stable functional state can be maintained. As shown in FIG. 7, the introduction and supply of the external gas slightly affects the vacuum value of the cavity. Is only about +50 mmHg, and the actual (local measurement) vacuum value on the roll body surface at this time is -2.
The pressure is maintained at about 30 mmHg, and has almost no effect on the actual liquid absorbing function as a liquid absorbing roll, which has been proved by the applicant's experimental measurement results. And
As shown in the figure, within a very short time, the working vacuum value before the introduction of the external gas was recovered (-250 mmHg in the table on the roll body, based on local measurement), and maintained for about 5 seconds, for example. Enter the next cycle of introduction. As described above, by at least intermittently introducing and supplying the external gas, it is possible to avoid the formation of a shielded basin beforehand, and to always stably maintain the vacuum suction and drainage function of the suction roll, and to resist centrifugal action. It will be possible to effectively demonstrate the expected abilities. It should be noted that the forced introduction and supply of the external gas may be constantly performed depending on conditions such as the liquid absorbing roll conditions, the process conditions, the capacity of the working vacuum device, and the quality standards required for the workpiece such as a steel plate.

An example of a liquid absorbing roll employing a speed-up suction mechanism of a venturi-shaped nozzle will be described. As shown in FIGS. 4 and 5, an umbrella-shaped spacer provided at an appropriate interval in the converging portion of the cavity of the liquid absorbing roll is used to concentrate the vacuum suction force on the venturi-shaped nozzle portion having a small cross-sectional area. In addition, the structure is such that it acts on the inner wall surface of the hollow portion (the liquid-flow basin generating portion), and as described above, the liquid generated by centrifugal force on the inner wall surface of the (conventional) suction roll A 'rotating at a high speed. Directly acts on the shielded basin in a state in which the action of the vacuum suction force is amplified, and actively aspirates and drains the liquid in the shielded basin by the increased accompanying conveying force and the effective suction action acting locally. . Thus, the configuration is such that the generation of the shielded basin by the liquid is avoided beforehand. The example shown in FIG.
This is a modified example of the mechanism, in which a spacer core having a similar shape to the hollow portion is provided at an appropriate interval in a hollow portion having a convergent portion, and the internal cross-sectional area of the hollow portion is controlled using the similar-shaped spacer. However, similarly to the above-described example, the vacuum suction effect amplified by the Venturi effect due to the change in the cross-sectional area is positively and more directly applied to the inner wall surface of the (conventional) suction roll A ′ (the generation of a liquid shielding basin). It is intended to exert the same effect as in the above-described example by acting on the section (1).

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

The liquid absorbing roll A of the present invention has a bearing 1
a shaft body 1 composed of a, 1b and a shaft portion 1c;
A porous porous structure (roll pad portion) having a capillary action (function) and absorbing liquid is formed through side plates 2 and 3 provided on the outer wall surface of the shaft portion 1c. Roll body 4 and bearing 1a and / or bearing 1b
And the vacuum connection pipe 5 communicated with the main component,
Further, it inhibits the generation of a shielding basin for liquid formed on the inner wall surface of the cavity, which will be described in detail below.
Each of the configurations for maintaining or restoring the vacuum suction / drainage function is provided.

In the drawings, reference numerals 6 and 6a denote bearing portions 1 of the shaft main body 1.
a, communication holes provided in 1b, 7 is a hollow portion opened in the longitudinal direction of the shaft portion 1c of the shaft body 1, 8 is a plurality of transparent holes formed in the shaft portion 1c of the shaft body 1 and communicates with the hollow portion 7. These communication holes 6, (6a), the cavity 7, and a large number of through holes 8
Thus, a vacuum suction passage of the shaft main body 1 is configured. Reference numeral 9 denotes a bearing.

Hereinafter, examples of the means for maintaining or recovering the vacuum suction / drainage function will be described.

First, each of the examples shown in FIGS.
In this configuration, the forced supply of the external gas is constantly or intermittently performed. FIG. 1 shows a method in which a nozzle 11 connected to an external gas introduction piping system 10 is positioned in a cavity 7 and air is introduced (supplied) from the nozzle 11 into the cavity 7. Introduce (not limited, same hereafter).
FIG. 2 shows a configuration in which an external gas introduction piping system 10 is connected to the outer opening end of the bearing portion 1b.

FIG. 3 shows a configuration in which an external gas introduction piping system 10 is connected via a rotary joint 12 provided in the bearing portion 1b. In each case, the introduction and supply of outside air and the control of the outside air require a setting that does not adversely affect the liquid absorption function on the upper surface of the liquid absorption roll A of the present invention, or the process conditions, Various contents can be considered according to the request. Further, the introduced outside air may be a compressed fluid. Next, in each of the examples shown in FIGS. 4 to 6, the action of the vacuum suction force in the cavity 7 is amplified by the Venturi effect due to the change in the cross-sectional area with a mechanical flow path configuration, and a liquid shielding basin is generated. This is a configuration that acts directly on the vicinity of the inner wall surface 7a of the cavity 7 which is easy to operate. That is, FIG. 4 shows a configuration in which a slit-shaped gap 15 is formed in the converging portion 7b of the hollow portion 7 and the action of the vacuum suction force is applied by the slit-shaped gap 15 in an amplified state. FIG. 5 shows a configuration in which an umbrella-shaped spacer 14 is provided in the converging portion 7b, a conduction hole 16 is formed in the converging portion 7b, and the action of the vacuum suction force is amplified by the conduction hole 16 in an amplified state. . Further, FIG. 6 shows a spacer core 17 having a similar shape to the hollow portion 7 in the hollow portion 7 having the converging portion at an appropriate interval H.
And the function of the vacuum suction force amplified by the Venturi effect due to the change in the cross-sectional area is positively and more directly applied to the inner wall surface 7a (shielded basin). In addition, since the structure which exerts the above-mentioned Venturi effect is an example, the other structure which has the same effect, for example, the structure which collects liquid using a branch pipe, the plate which has pores on the outer periphery in place of an umbrella-shaped spacer It is a matter of course that a configuration in which the flow path is controlled by the control may be used.

FIG. 7 shows the supply time of the external gas, the resulting vacuum value in the cavity 7 of the suction roll A of the present invention, and the vacuum value (local measurement) on the upper surface of the roll body 4. FIG. 4 is a schematic diagram showing the relationship, and the influence of the introduction and supply of the external gas on the vacuum value on the upper surface of the roll body 4 is extremely small. No problem. FIG. 9 shows the same high-speed rotation and high-speed processing (at a speed of 850 m / mi) for the (conventional) suction roll A ′, the “invention” suction roll A, and the rubber roll B.
n) Comparative examples of the performance under the conditions are shown. In particular, with respect to the edge portion (corresponding to the end face of the steel plate) where the liquid is likely to remain and the difference in the performance is remarkable, X is the residual liquid amount level by the rubber roll B, and Y is the same. The residual liquid amount due to the (conventional) suction roll A ′ and Z indicate the remaining liquid amount due to the suction roll A of the present invention, respectively. FIG. 8 is a schematic view for explaining the liquid absorbing state of the liquid absorbing roll A of the present invention and the (conventional) rubber roll B, and FIG. 10 is a schematic diagram illustrating the (conventional) liquid absorbing rolls A ′ and (conventional). FIG. 4 is a schematic diagram for explaining a liquid absorption state by a rubber roll B (coming), and as shown by numerical values in the drawing, vacuum suction drainage / liquid drainage due to generation of a liquid shielding basin (liquid of the upper surface of the object to be processed). Removal) Differences in function are clearly indicated.

[0024]

According to the present invention, there are provided a roll body having a large number of porous holes for capillary action and water absorption provided in a shaft body having a through-hole and a cavity, and a vacuum connection piping system provided in a communication hole of the shaft body. In the drainage method of vacuum-suctioning and draining the fluid of an object to be processed by using a suction roll provided with a water-absorbing roll, a water basin formed on the inner wall surface of the cavity, a layered water basin, and a shielding basin such as a water wall are formed. ,
This is a method of recovering the drainage function of the suction roll, which is configured to break by accelerated suction by intermittent forced introduction of an external gas, open a through hole in the inner wall surface, and recover the drainage function by vacuum suction.
Therefore, the generation of a shielded basin generated in the cavity of the suction roll rotating at high speed is positively broken by accelerated suction by forcible introduction of external gas, and the drainage function by vacuum suction of the suction roll can be recovered. is there.

Further, the present invention provides a shaft body having a through hole and a hollow portion, a roll body having a number of porous holes surrounding the shaft body, and a vacuum connection piping system provided in a communication hole of the shaft body. A method for recovering the drainage function of the suction roll, comprising a suction roll provided with vacuum suction drainage constituted by: and an external gas introduction pipe connected to a communication hole communicating with a cavity of the suction roll. It is a drainage device used for. Therefore, it is possible to avoid the occurrence of a shielded basin generated in the cavity of the liquid absorbing roll rotating at a high speed, and to constantly maintain the liquid discharging function by vacuum suction of the liquid absorbing roll, or the liquid absorbing device provided with the liquid discharging device. There is a real benefit in reducing the burden on roll production or cost.

Further, the present invention provides a shaft body having a through hole and a hollow portion, a roll body having a number of porous holes surrounding the shaft body, and a vacuum connection piping system provided in a communication hole of the shaft body. A suction roll provided with vacuum suction drainage composed of: and an umbrella-shaped spacer provided at an appropriate interval in the converging portion of the cavity portion of the liquid absorbing roll, or an appropriate interval in the cavity portion having the converging portion This is a drainage device used for a method of restoring the drainage function of a suction roll, which is constituted by a hollow part provided in the above and a spacer core having a similar shape. Therefore, it is possible to avoid the occurrence of a shielded basin generated in the cavity of the liquid absorbing roll rotating at a high speed, and to constantly maintain the liquid discharging function by vacuum suction of the liquid absorbing roll, or the liquid absorbing device provided with the liquid discharging device. There is a real benefit in reducing the burden on roll production or cost.

Further, the present invention relates to a method for recovering the drainage function of a corresponding suction roll by a drainage device used in the above-mentioned recovery method for drainage function, wherein the hollow portion of the suction roll is provided with an appropriate interval. Equipped with an umbrella-shaped spacer or convergence part
Using a spacer core similar in shape to the cavity provided at appropriate intervals in the obtained cavity , the water film formed on the inner wall surface of the cavity, a layered water film, breaking the shielding basin such as the water wall, This is a method for recovering the drainage function of the suction roll, in which a through-hole on the inner wall surface is opened to recover the drainage function by vacuum suction. Therefore, it is a useful and useful method for recovering the drainage function by vacuum suction of the liquid absorbing roll by avoiding and / or breaking down the generation of the shielding basin generated in the cavity of the liquid absorbing roll rotating at high speed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example in which an air nozzle is used for a liquid absorbing roll.

FIG. 2 is a cross-sectional view showing an example in which an air supply pipe is directly used for a liquid absorbing roll.

FIG. 3 is a sectional view showing another example of FIG. 2;

FIG. 4 is a cross-sectional view showing an example in which an umbrella-shaped spacer is provided at a converging portion of a liquid absorbing roll to form a slit gap.

FIG. 5 is a cross-sectional view showing an example in which an umbrella-shaped spacer is provided at a converging portion of a liquid absorbing roll and a slit hole is formed.

FIG. 6 is a cross-sectional view illustrating an example in which a similar-shaped spacer is interposed in a hollow portion of a liquid absorbing roll.

FIG. 7 is a schematic diagram comparing a vacuum value between a cavity and the surface of a roll body.

FIG. 8 is a schematic diagram illustrating a state of a steel sheet treatment by a liquid absorbing roll.

FIG. 9 is a schematic diagram showing the results of a conventional roll and a liquid absorbing roll.

FIG. 10 is a schematic diagram illustrating a state of a steel sheet treatment by a conventional roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft main body 1a Bearing part 1b Bearing part 1c Shaft part 2 Side plate 3 Side plate 4 Roll body 5 Vacuum connection pipe 6 Communication hole 6a Communication hole 7 Cavity part 7a Inner wall surface 7b Converging part 8 Through hole 9 Bearing 10 External gas introduction piping system Reference Signs List 11 air nozzle 13 rotary joint 14 umbrella-shaped spacer 15 slit gap 16 conductive hole 17 similar spacer A (conventional) liquid absorbing roll A 'liquid absorbing roll B (conventional) rubber roll X residual liquid level Y Residual liquid amount Z Residual liquid amount H interval

Continuation of the front page (56) References JP-A-59-69186 (JP, A) JP-A-5-256572 (JP, A) JP-A-3-146212 (JP, A) Jpn. 53-11676 (JP, U) JP 4927014 (JP, B1) JP 3-42964 (JP, B2) JP 43-24704 (JP, Y1) 43-24703 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F26B 5 / 12,5 / 16,13 / 30 F26B 13 / 26,25 / 20 B21B 45/20 330

Claims (4)

(57) [Claims] 1. A shaft body having a through hole and a hollow portion, a roll body having a large number of porous holes for performing a capillary action and a water absorbing action provided in the shaft body, and a vacuum provided in a communication hole of the shaft body. In a drainage method for vacuum-suctioning and draining a fluid of an object to be processed using a suction roll provided with a connection piping system, a water film, a layered water film, and a water wall formed on an inner wall surface of the hollow portion are provided. A high-speed liquid-absorbing roll having a configuration in which a shielded basin such as is broken by accelerated suction by intermittent forced introduction of an external gas to open a through hole in the inner wall surface and recover a drainage function by vacuum suction. Drainage function recovery method. 2. A shaft body having a through hole and a hollow portion, a roll body surrounding the shaft body and having a number of porous holes, and a vacuum connection piping system provided in a communication hole of the shaft body. A high-speed liquid suction roll provided with vacuum suction and drainage, and an external gas introduction pipe connected to a communication hole communicating with the cavity of the liquid suction roll. Drainage device used for recovery method. 3. A shaft main body having a through-hole and a hollow portion, a roll main body having a number of porous holes surrounding the shaft main body, and a vacuum connection piping system provided in a communication hole of the shaft main body. A high-speed corresponding suction roll provided with vacuum suction and drainage, and an umbrella-shaped spacer provided at the converging portion of the cavity portion of the liquid absorbing roll, or a hollow portion provided with a converging portion provided at appropriate intervals. A drainage device for use in a method for restoring the drainage function of a high-speed liquid-absorbing roll, comprising: a spacer core having a similar shape to the hollow portion; 4. A method for recovering a drainage function of a high-speed liquid-absorbing roll using a liquid drainage device used in the method for recovering a liquid-absorbing function according to claim 3, wherein the liquid-absorbing roll has an appropriate space at a converging portion of a hollow portion of the liquid-absorbing roll. Umbrella-shaped spacers provided in the cavity portion, or formed on the inner wall surface of the cavity portion using a spacer core similar in shape to the cavity portion provided in the cavity portion having a convergent portion at an appropriate interval. The drainage function recovery of the high-speed liquid-absorbing roll is configured to break the shielding basin such as the water film, the layered water film, and the water wall, and to open the through-hole on the inner wall surface to recover the drainage function by vacuum suction. Method.