JP3664564B2 - Doctor device with scraper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a doctor device used to scrape off foreign matter adhering to a roll surface such as a paper machine roll, and is scraped off from the roll surface by a doctor blade and collected between the blade edge portion of the doctor blade and the roll surface. The present invention relates to a doctor device with a scraper that removes paper scraps and the like.
[0002]
[Prior art]
When a foreign material such as a paper basket adheres to the surface of a paper machine roll used in a paper machine, problems such as tearing of the conveyed paper occur due to the foreign matter. In order to avoid this, each paper machine roll is provided with a doctor device for scraping off foreign matter adhering to the surface thereof.
[0003]
The doctor device supports the blade holder, a doctor blade pressed against the surface of the roll, a blade holder for rotating the doctor blade to the pressure contact position where the doctor blade is pressed against the roll, and an open position away from the roll. It is basically composed of a doctor back. By pressing the blade edge of the doctor blade against the rotating roll surface with a constant pressing force, foreign matter such as paper sheets adhering to the roll surface is scraped off.
[0004]
A part of the foreign matter such as paper scrapes scraped off from the roll surface is accumulated on the blade edge portion of the doctor blade and the portion of the roll surface to which the blade edge is pressed. When a large amount of paper sheets or the like are accumulated in such a portion, there is a high possibility that a part of the paper sheets or the like will enter between the blade edge and the roll surface. If foreign matter is clogged between the blade edge and the roll surface, scraping off of foreign matter such as paper bottles will be insufficient.
[0005]
In order to avoid this harmful effect, conventionally, an operator regularly cleans foreign matter such as collected paper dust from the blade edge portion and the roll surface.
[0006]
[Problems to be solved by the invention]
However, it is not efficient to perform foreign object removal work by relying on human hands. In particular, when a large amount of paper sheets or the like are accumulated during the scraping operation, it is necessary to interrupt the scraping operation and perform cleaning, which is not efficient.
[0007]
An object of the present invention is to propose a doctor device capable of efficiently removing foreign substances such as scraped paper scraps.
[0008]
[Means for Solving the Problems]
The present invention provides a doctor device having a doctor blade pressed against the roll surface in order to scrape off deposits on the roll surface, and the upstream surface in the roll rotation direction of the blade edge portion of the doctor blade is the longitudinal length of the blade edge portion. The structure which has the scraper provided with the elastic sliding member which can slide to a direction is employ | adopted.
[0009]
If the scraper is periodically slid along the upstream surface in the roll rotation direction of the blade edge portion of the doctor blade, foreign matters such as paper sheets accumulated in this portion can be removed. Further, if the scraper is slid even during the scraping operation by the doctor blade, the scraping operation can be performed while maintaining the state where the scraped foreign matter does not always accumulate on the blade edge portion.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1A is a schematic configuration diagram of a doctor device with a scraper to which the present invention is applied, and FIG. 1B is an explanatory diagram showing a portion of the scraper.
[0011]
Referring to these drawings, the doctor apparatus 1 includes an elongated rectangular doctor blade 2 having a cutting edge portion 2a pressed against the roll surface, a blade holder 3 holding the base end side, The doctor back 4 is configured to support the holder 3. The doctor back 4 is rotatably supported by bearings on the side of a gantry (not shown) on which journal shafts 4a attached to both ends are fixedly arranged. A turnbuckle (not shown) is connected between the doctor back 4 and the gantry, and the doctor back 4 can be fixed at an arbitrary turning angle by adjusting this.
[0012]
The blade holder 3 is supported on the doctor back 4 side so as to be rotatable about the connecting rod 3a. A blade opening tube 5 is disposed on the front side of the connecting rod 3a, and a blade pressurizing tube 6 is disposed on the rear side. These tubes 5 and 6 are made of a flexible material. When the tube 5 is expanded, the blade holder 3 holding the doctor blade 2 rolls the doctor blade 2 around the connecting rod 3a. It turns in the direction away from the surface 31 of, ie, the opening direction. When the other tube 6 is expanded, the blade holder 3 turns in the direction in which the doctor blade 2 is pressed against the surface 31 of the roll 30, that is, in the pressurizing direction.
[0013]
The tubes 5 and 6 are expanded and contracted by controlling the supply of air thereto. That is, the air supply path from the air source 7 communicates with the tubes 5 and 6 via the pressure adjustment valve 8 and the four-way switching valve 9. When the switching valve 9 is set so as to be at the switching position shown in the figure, the pressurizing tube 6 expands. Conversely, when the switching valve is switched, the opening tube 5 expands.
[0014]
Here, a scraper 10 is attached to the doctor device 1. The scraper 10 includes a rodless air cylinder 11 attached to the upper surface of a frame 4b constituting the doctor back 4, and the rodless air cylinder 11 is arranged in parallel with the cutting edge 2a of the doctor blade 2. . The rodless air cylinder 11 is provided with a drive ring 12 that can be reciprocated in the axial direction of the cylinder by the cylinder 11. An arm 13 extending in a direction perpendicular to the cylinder 11 is attached to the drive ring 12, and an elastic sliding member 14 made of rubber, felt or the like is attached to the tip of the arm 13 in a detachable manner. It has been.
[0015]
When the rodless air cylinder 11 is driven, the drive ring 12 moves in the cylinder axial direction, so that the elastic sliding member 14 supported by the tip of the arm 13 that moves with the drive ring 12 moves on the upper surface of the cutting edge 2a of the doctor blade 2. Slide. Accordingly, the foreign matter that is scraped off from the surface 31 of the roll 30 and collects between the upper surface of the blade edge 2a and between the blade edge and the roll surface is swept away by the elastic sliding member 14 toward both ends of the doctor blade 2 and dropped from there. To do. Therefore, it is not necessary to manually clean the foreign matter accumulated on the upper surface of the blade edge 2a.
[0016]
In addition, by rotating the drive ring 12, the elastic sliding member 14 can be moved in a direction away from the blade edge 2a. In this way, the elastic sliding member 14 does not get in the way when the doctor blade 2 is replaced.
[0017]
In the illustrated doctor apparatus 1, a rodless air cylinder is used as the sliding mechanism of the elastic sliding member. However, the mechanism for reciprocating the elastic sliding member is not limited to the air cylinder. It may be a mechanism.
[0018]
【The invention's effect】
As described above, the doctor device of the present invention includes the scraper, and foreign substances such as paper scraps scraped off on the upper surface of the blade edge of the doctor blade and the roll surface can be removed by the scraper. Therefore, it is possible to avoid the occurrence of poor scraping of the doctor blade due to accumulation of foreign matter scraped off at the blade edge of the doctor blade and the portion of the roll surface that is in pressure contact therewith. In addition, it is possible to remove foreign matters more efficiently than in the case where such foreign matters are cleaned by relying on human hands.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an air tube doctor device used for a paper machine roll to which the present invention is applied, and an explanatory view of a scraper portion.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Doctor apparatus 2 Doctor blade 2a Cutting edge 3 Blade holder 4 Doctor back 10 Scraper 11 Rodless air cylinder 12 Drive ring 13 Arm 14 Elastic sliding member 30 Roll 31 Roll surface

Claims (1)

In a doctor device having a doctor blade pressed against the roll surface in order to scrape off deposits on the roll surface,
A doctor device with a scraper, comprising a scraper provided with an elastic sliding member capable of sliding an upstream surface in a roll rotating direction of a blade edge portion of the doctor blade in a longitudinal direction of the blade edge portion.

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