JP3905976B2 - Doctor device for dryer roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a doctor device used for scraping off foreign matter adhering to the surface of a dryer roll in a paper machine. The present invention relates to a doctor device for a dryer roll that can be easily performed.
[0002]
[Prior art]
A doctor device is used to write down foreign matter adhering to the surface of the dryer roll. As shown in FIG. 3, the doctor device 1 includes a doctor blade 3 that is pressed against the surface 2 a of the dryer roll 2, a blade holder 4 that holds the doctor blade 3, and supports the blade holder 4. The doctor back 5 is provided. The doctor back 5 is supported by bearings (not shown) installed on the fixed side in a state where journal shafts 6 attached to both side surfaces thereof are rotatable. The doctor back 5 is fixed at an appropriate turning position by a turning restraining member (not shown) such as a turnbuckle.
[0003]
The blade holder 4 is, for example, an air tube type provided with a pair of air tubes 41, 42. The front air tube 41 is an opening air tube, and the rear one is a pressure contact air tube. By adjusting the amount of air supplied to or discharged from these air tubes 41, 42, the finger portion 43 holding the doctor blade 3 moves in the direction approaching and separating from the roll surface 2a with the pivot 44 as the center. It is possible to turn.
[0004]
[Problems to be solved by the invention]
When performing doctoring of the surface 2a of the dryer roll 2 using such a doctor apparatus 1, there are the following problems to be solved.
[0005]
When the paper transported while being dried along the surface of the dryer roll 2 is cut, etc., the paper reaches the position where the blade edge 3a of the doctor blade is pressed against the roll surface 2a, and the blade edge 3a It may bite between the roll surfaces 2a.
[0006]
In particular, in the case of the wide dryer roll 2, such a paper bite tends to occur in the central portion. When the paper bites in, the paper P gradually enters toward the downstream side in the roll rotation direction as the roll 2 rotates as shown in FIG.
[0007]
When such a situation occurs, when the rotation of the dryer roll 2 is stopped, it is mainly necessary to open the doctor device 1 from the roll surface 2a and remove the paper P that has been caught. When the doctor device 1 is opened, the leading edge P1 of the paper P may come off the blade edge 3a of the doctor blade and hang down to the doctor back 5 side as shown in FIG. In this case, the paper P cannot be removed easily, and the recovery process takes time.
[0008]
In addition, when such a situation occurs, a large amount of paper baskets or the like adheres to the back surface portion of the doctor blade 3 and the roll surface portion downstream of the doctor blade 3 in the roll rotation direction. It is necessary to remove soot and the like.
[0009]
In view of these points, an object of the present invention is to propose a doctor device for a dryer roll that can easily perform a recovery process when paper bites into the blade edge of a doctor blade.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a doctor blade pressed against the surface of a dryer roll , a blade holding part that holds the doctor blade, and a support part that supports the blade holding part. A doctor device for a dryer roll comprising: an air blowing means, the air blowing means being disposed closer to the dryer roll than the doctor blade, and the dryer roll having a blade edge than the blade edge of the doctor blade . From the downstream side in the rotation direction, an air flow is blown to the blade edge portion of the doctor blade and the roll surface portion downstream of the blade edge portion in the rotation direction of the dryer roll .
[0011]
Next, the present invention is for a dryer roll comprising a doctor blade pressed against the surface of a dryer roll, a blade holding portion holding the doctor blade, and a support portion supporting the blade holding portion. The doctor device has first and second air blowing means arranged so as to sandwich the doctor blade from both sides, and the first air arranged on the dryer roll side with respect to the doctor blade. The spraying means includes a blade edge portion of the doctor blade from the downstream side in the rotational direction of the dryer roll with respect to the blade edge of the doctor blade, and a roll positioned downstream in the rotational direction of the dryer roll from the blade edge portion. An air stream is blown on the surface portion, and the dryer robot is applied to the doctor blade. The second air blowing means arranged on the opposite side of the blade from the blade edge of the doctor blade and the blade edge portion from the downstream side in the rotational direction of the dryer roll from the blade edge of the doctor blade Is also characterized in that an air flow is blown onto the roll surface located upstream in the rotational direction of the dryer roll.
[0012]
Next, the present invention is a method for removing paper that has digged in between the blade edge of the doctor blade and the roll surface in the doctor device for a dryer roll having the above-described configuration,
During doctor ring, when air is blown out from the air blowing means and the paper bites into the downstream side in the roll rotation direction from between the blade edge of the doctor flade and the roll surface, Always blowing air,
During the work to remove the paper that has digged in, while continuing to blow air by the air blowing means, the dryer roll is stopped and the blade edge of the doctor blade is released from the roll surface,
While extruding the bite of the paper released from between the blade edge and the roll surface to the upstream side in the roll rotation direction by the air flow, preventing the paper part from drooping to the side of the support, The portion of the roll surface that needs to be cleaned due to the paper sheet adhering to the portion of the paper that has been squeezed is cleaned by air blown from the air blowing means.
[0013]
In the doctor device of the present invention configured as described above, when the paper bites between the blade edge of the doctor blade and the roll surface and enters the downstream side thereof, air is always blown to that portion. Therefore, when the doctor device is opened and the doctor blade is withdrawn from the roll surface, the paper that has been swallowed does not hang down on the doctor back side because air is blown. Conversely, the paper is pushed out from between the doctor blade and the roll surface to the upstream side in the roll rotation direction. As a result, it is possible to easily carry out the work of removing the entrapped paper.
[0014]
Further, the portion of the roll surface where the paper basket has adhered and cleaning is required due to the paper biting in is cleaned by the air blown from the air nozzle. Therefore, manual cleaning is not necessary. As described above, in the doctor apparatus of the present invention, it is possible to easily and efficiently perform the recovery process when the paper is bitten.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a dryer roll doctor apparatus to which the present invention is applied will be described with reference to FIG.
[0016]
FIG. 1 shows the overall configuration of a dryer roll doctor device of this example. The basic structure of the doctor device 11 is the same as that generally used. The doctor blade 13, the air tube type blade holder 14 that holds the doctor blade 13, and the doctor back that supports the doctor blade 13 15 is provided. Journal shafts 16 are attached to both ends of the doctor back 15, and the journal shafts 16 are rotatably supported by journal bearings 18 attached to a bracket 17 which is a fixed member. The turning of the doctor back 15 is restricted by a turn buckle 19 that connects between the bracket 17 and the doctor back 15.
[0017]
In addition to this configuration, the doctor device 11 of the present example includes a pair of air blowing devices 20 and 30 arranged so as to sandwich the doctor blade 13 from both sides . One air blowing device 20 includes an air pipe 21 disposed on the side opposite to the dryer roll 2 with respect to the doctor blade 13 and a number of air nozzles 22 formed in the air pipe 21. The blowing direction is set so that the air flow from each air nozzle 22 is blown to the surface side portion of the blade edge 13a of the doctor blade 13 and the roll surface portion upstream of the blade edge 13a in the roll rotation direction. ing.
[0018]
The other air blowing device 30 includes an air pipe 31 disposed at a downstream position in the roll rotation direction on the dryer roll 2 side of the doctor blade 13, and a number of air nozzles 32 formed in the air pipe 31. ing. The blowing direction is set so that the air flow from each air nozzle 32 is blown to the back surface portion of the blade edge 13a of the doctor blade 13 and the roll surface portion downstream of the blade edge 13a in the roll rotation direction. ing.
[0019]
In the doctor apparatus 11 of this example configured as described above, it is assumed that the paper P bites between the blade edge 13a of the doctor blade and the roll surface 2a as shown in FIG.
[0020]
In this case, when the rotation of the roll 2 is stopped and the doctor device 11 is released from the roll surface, the portion of the paper P released from between the blade edge 13a of the doctor blade and the roll surface 3a is a downstream air blowing device. The air blown from the 30 air nozzles 32 is pushed upstream in the roll rotation direction.
[0021]
At the same time, the surface of the roll downstream in the roll rotation direction with respect to the doctor blade 13 removes deposits such as paper sheets by the blown air.
[0022]
For this reason, in the state where the doctor device 11 is opened, as shown in FIG. 2, the paper P is pushed to the upstream side in the roll rotation direction, so that it does not hang down to the doctor back 15 side.
[0023]
Thus, according to the doctor apparatus 11 of this example, the recovery process in the case of paper biting in can be easily performed. Further, in this example, since the air blowing device 20 is also arranged on the upstream side of the doctor blade 13 in the roll rotation direction, the operation of pushing the paper upstream in the roll rotation direction is performed efficiently. Further, during the doctor ring, paper scraps scraped off by the doctor blade 13 can be efficiently removed from the blade edge 13a of the doctor blade.
[0024]
In this example, since the air pipes 21 and 31 of the air blowing devices 20 and 30 are attached to the doctor back 15, the air blowing direction of the air nozzles 22 and 32 changes as the doctor device 11 turns.
[0025]
Instead of this, the air blowing direction in the air blowing device 20 may be set to a constant direction regardless of the rotation of the doctor device 11.
[0026]
【The invention's effect】
As described above, the doctor device for a dryer roll according to the present invention includes air blowing means for blowing air to a position downstream of the doctor blade in the roll rotation direction. Air is blown toward the surface.
[0027]
Therefore, according to the present invention, when the paper bites between the doctor blade and the roll surface, an air flow is generated so as to push the paper upstream in the roll rotation direction. When it is opened, paper can be prevented from entering the doctor's back and hanging down. The roll surface is also cleaned by this air flow. Therefore, it is possible to efficiently and easily perform the recovery process when the paper is bitten.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a dryer roll doctor device to which the present invention is applied.
FIG. 2 is an explanatory view showing the operational effects of the doctor device of FIG. 1;
FIG. 3 is a schematic configuration diagram of a conventional doctor apparatus.
4 is an explanatory diagram for explaining problems of the doctor device of FIG. 3; FIG.
[Explanation of symbols]
2 Dryer roll 2a Roll surface 11 Doctor device 13 Doctor blade 13a Cutting edge 14 Blade holder 15 Doctor back 16 Journal shaft 17 Bracket 18 Journal bearing 19 Turn buckle 20, 30 Air blowing device 21, 31 Air pipe 22, 32 Air nozzle P Paper P1 Paper tip

Claims (3)

In the doctor device for the dryer roll comprising a doctor blade pressed against the surface of the dryer roll, a blade holding portion holding the doctor blade, and a support portion supporting the blade holding portion,
Having air blowing means,
The air blowing means than said doctor blade is arranged on the side of the dryer rolls, from said downstream side of the rotational direction of the drier roll than the cutting edge of the doctor blade, the cutting edge portion of the doctor blade, and, the cutting edge A doctor device for a dryer roll, characterized in that an air flow is blown to a roll surface portion downstream of the portion in the rotation direction of the dryer roll. In a doctor device for a dryer roll comprising a doctor blade pressed against the surface of the dryer roll, a blade holding portion holding the doctor blade, and a support portion supporting the blade holding portion,
Having first and second air blowing means arranged to sandwich the doctor blade from both sides;
The first air blowing means arranged on the side of the dryer roll with respect to the doctor blade, the blade edge portion of the doctor blade from the downstream side of the rotation direction of the dryer roll from the blade edge of the doctor blade, And, the air flow is blown to the roll surface portion located downstream of the blade edge portion in the rotational direction of the dryer roll,
The second air blowing means disposed on the side opposite to the dryer roll with respect to the doctor blade has a blade edge of the doctor blade from the downstream side in the rotation direction of the dryer roll rather than the blade edge of the doctor blade. A dryer apparatus for a dryer roll, characterized in that the air flow is blown to a portion and a roll surface located upstream of the blade edge portion in the rotational direction of the dryer roll. A method of removing paper that has digged in between the blade edge of the doctor blade and the roll surface in the doctor device for a dryer roll according to claim 1 or 2,
During doctor ring, when air is blown out from the air blowing means and the paper bites into the downstream side in the roll rotation direction from between the blade edge of the doctor blade and the roll surface, the paper is always taken into the bited part of the paper. Blowing air,
During the work to remove the paper that has digged in, while continuing to blow air by the air blowing means, the dryer roll is stopped and the blade edge of the doctor blade is released from the roll surface,
While extruding the bite of the paper released from between the blade edge and the roll surface to the upstream side in the roll rotation direction by the air flow, to prevent the paper part from drooping to the side of the support, The paper removal of the doctor device for the dryer roll, characterized in that the part of the roll surface that needs to be cleaned due to the paper sheet adhering to the part of the paper that has been swept in is cleaned by air blown from an air blowing means Method.

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