JP4587818B2 - Doctor device - Google Patents

Description

  The present invention relates to a doctor device for scraping off foreign matters such as paper sheets adhering to the surface of a roll such as a paper machine roll, and more specifically, provided with a foreign matter collecting mechanism capable of efficiently collecting the scraped foreign matter. It relates to a doctor device.

  A doctor device used in a paper machine or the like holds a doctor blade pressed against the surface of a paper machine roll, and the doctor blade is pivotably held at a pressure contact position where the doctor blade is pressed against the roll and an open position away from the roll. It basically comprises a blade holder and a doctor back that supports the blade holder. By pressing the blade edge of the doctor blade against the rotating roll surface with a constant pressure, foreign matter such as paper sheets adhering to the roll surface can be scraped off.

  In general, a doctor blade is a plate having a length corresponding to the roll surface length (length in the axial direction of the roll). A blade edge is formed on one long side edge of the doctor blade, and the other long side edge portion is a blade. It is clamped from both sides by the holder. When the doctor device is installed in a posture where the doctor blade is almost horizontal, and the roll rotates from the upper side to the lower side at the tip of the doctor blade, the foreign matter scraped off from the roll surface is removed from the upper surface of the doctor blade. It collects in. Further, the foreign matter accumulated here moves rearward along the upper surface, is pushed out to the upper surface portion of the rear blade holder, and further falls to the upper surface of the doctor back on the rear side of the blade holder.

  When a large amount of foreign matter accumulates on the upper surface of the doctor back, the foreign matter falls on the floor surface and scatters around. Therefore, conventionally, the foreign matter accumulated on the upper surface of the doctor back is periodically removed manually by hand so that the foreign matter accumulated on the upper surface of the doctor back is not scattered around.

  However, the method of removing foreign substances accumulated on the upper surface portion of the doctor device by hand has a problem in that the removal operation cannot be performed during operation and the efficiency is poor.

  In view of such a point, an object of the present invention is to propose a doctor device capable of efficiently collecting foreign matters such as paper scrapes scraped off by a doctor blade without being scattered around. .

In order to solve the above-described problems, the present invention includes a doctor blade, a blade holder that holds the rear end side of the doctor blade, and a doctor back that supports the blade holder. In a doctor device that presses a blade edge of a blade against a roll surface of a paper machine roll or the like and scrapes foreign matter such as paper scum adhering to the roll surface, the blade holder is scraped off from the roll surface and the doctor blade The doctor back includes a top plate portion that receives foreign matter fed backward from the upper surface portion of the blade holder, and a foreign substance drop hole formed in the top plate portion. When receiving the foreign objects naturally fall from the foreign object dropping hole, and a foreign material discharge passage for discharging to the outside, before The foreign material drop hole is formed in a state of being separated into a plurality along the width direction of the doctor back at a portion near the rear end of the blade holder in the top plate portion, and the hole diameter of each foreign material drop hole is: It is characterized in that it is set smaller than the width dimension of the stock conveyed through the roll .

Further, the present invention is characterized in that a discharge port of the foreign matter discharge passage is formed in at least one end plate portion of the doctor back, and the foreign matter discharge passage is inclined toward the discharge port .

Further, the foreign substance dropping holes are arranged in a staggered manner in the top plate portion .

  In the doctor device of the present invention, a foreign substance drop hole is formed in the top part of the doctor back, and the foreign substance accumulated on the top part of the doctor back is naturally dropped from the foreign substance drop hole to the foreign substance discharge path disposed below. I try to let them. The foreign matter that has fallen into the foreign matter discharge path is discharged toward a predetermined place along the foreign matter discharge path. Therefore, it can prevent that the foreign material collected on the top plate part of the doctor back falls to the circumference from here and is scattered. In addition, foreign matters such as paper scrapes scraped by the doctor blade can be efficiently collected without human intervention.

  Next, in this invention, the foreign material fall hole is formed in the state isolate | separated into plurality in the width direction of a doctor back. If the foreign material drop hole has a wide width, in the case of a paper machine roll or the like, when a piece of paper occurs, the cut paper may enter the foreign material drop hole and be jammed there. The present invention can prevent such harmful effects.

  Hereinafter, an example of a doctor apparatus to which the present invention is applied will be described with reference to the drawings.

  1A and 1B are a schematic perspective view and a schematic sectional view of a doctor apparatus to which the present invention is applied. Referring to these drawings, the doctor device 1 of this example holds an elongated rectangular doctor blade 2 having a cutting edge 2a pressed against the surface 10a of the roll 10 and the rear end side of the doctor blade 2. And a doctor back 4 supporting the blade holder 3.

  The doctor back 4 includes a top plate portion 41, a back plate portion 42 bent at an acute angle from the rear end of the top plate portion 41 to the lower side, and left and right end plate portions 43a and 43b. Journal shafts 5 are respectively fixed to the left and right end plate portions, and each journal shaft 5 is supported by a fixed base (not shown) in a rotatable state. A turnbuckle (not shown) is connected between the doctor back 4 and the gantry, and by adjusting this, the posture of the doctor back 4 can be adjusted to an arbitrary turning angle and fixed. .

  The blade holder 3 includes a bottom plate 31 attached to the upper surface of the front end portion of the doctor back 4, and a connecting rod 33 is bridged between support plates 32 attached to both ends of the bottom plate 31. A finger plate 34 is supported so as to be rotatable in the vertical direction around the connecting rod 33, and a top plate 35 is fixed to the upper surface of the finger plate 34. An insertion groove 36 into which the rear end portion 2 b of the doctor blade 2 is inserted from the front is formed in the front end portions of the finger plate 34 and the top plate 35. The rear end portion 2 b of the doctor blade 2 inserted here is sandwiched between the front end edge 35 a of the top plate 35 and the front end jaw portion 34 a of the finger plate 34.

  A connecting rod 33 is sandwiched between the finger plate 34 and the bottom plate 31, a blade opening tube 37 is disposed on the front side, and a blade pressurizing tube 38 is disposed on the rear side. These tubes 37 and 38 are made of a flexible material. When the side of the blade opening tube 37 is expanded, the doctor blade 2 turns around the connecting rod 33 in the direction away from the surface 10a of the roll 10, that is, in the opening direction. When the side of the blade pressurizing tube 38 is expanded, the doctor blade 2 pivots in a direction in which the doctor blade 2 is pressed against the surface 10a of the roll 10 around the connecting rod 33, that is, in the pressurizing direction.

  Here, a plurality of foreign substance drop holes 44 are formed at regular intervals along the width direction of the doctor back 4 in a portion near the blade holder 3 in the top plate portion 41 of the doctor back 4 of this example. ing. The diameter of the foreign material drop hole 44 is sufficiently smaller than the width dimension of the paper (not shown) conveyed through the roll 10.

  A pipe 45 having a U-shaped cross section is disposed on the back surface of the top plate portion 41, and the pipe 45 extends to both end surfaces of the doctor back 4. The foreign substance drop hole 44 communicates with the pipe 45, and the foreign substance falls into the pipe 45 through the foreign substance drop hole 44. One end of the pipe 45 is connected to a communication port 46 formed in the end plate portion 43 a of the doctor back 4. A suction duct of a suction device (not shown) is connected to the communication port 46. Of course, the communication ports 46 may be formed in the end plate portions on both sides of the doctor back 4.

  As shown in the drawing, the doctor device 1 of the present example configured as described above is disposed substantially horizontally as a whole at a position above the rotation center of the roll 10 and rotates in the direction of the arrow (from the upper side to the lower side). The blade edge 2 a of the doctor blade is pressed against the surface 10 a of the roll 10. When the roll 10 rotates, the foreign matter is scraped off from the roll surface 10a by the doctor blade cutting edge 2a pressed against the roll 10. The foreign matter scraped off from the roll surface 10a accumulates on the upper surface 2c of the cutting edge portion of the doctor blade 2. The foreign matter accumulated in this portion is pushed out by the following foreign matter and moves along the upper surface 2c of the doctor blade 2 and the upper surface 35b of the top plate 35 of the blade holder 3 continuing to the rear side. To the top plate portion 41 of the doctor back 4 which is one step lower than the above.

  A foreign substance drop hole 44 is formed in the top plate portion 41, and if the foreign substance drop holes 44 are formed with an appropriate density, most of the foreign matter dropped on the top plate portion 41 is transferred from the foreign substance drop hole 44 to the pipe 45. Fall into. Since one end of the pipe 45 communicates with the suction device through the communication port 46, the foreign matter dropped on the pipe 45 is collected outside through the communication port 46 from here.

  As described above, in the doctor apparatus 1 of the present example, the foreign substance drop hole 44 is formed in the top plate portion 41 of the doctor back 4, and foreign substances such as paper bags falling on the doctor back 4 are dropped. It is made to fall from the hole 44 to the pipe 45 (foreign matter discharge path) arranged inside the doctor back. Foreign matter in the pipe 45 is sucked and discharged from the communication port 46 to the outside. Therefore, foreign matters such as paper scrapes scraped off by the doctor blade 2 can be efficiently collected regardless of human hands. Further, it is possible to prevent foreign matters from being scattered around.

  In addition, the diameter of the foreign substance drop hole 44 is sufficiently smaller than the width dimension of the stock conveyed through the roll 10. For this reason, when the paper is cut, even if the leading end portion is sent out to the doctor back 4 side, it does not enter the foreign substance drop hole 44 and fall into a paper jam state.

  Furthermore, since the foreign substance discharge path is formed using the dead space inside the doctor back 4, it is possible to suppress the enlargement of the apparatus by configuring the foreign substance recovery mechanism as much as possible.

(Other embodiments)
The foreign substance drop hole 44 may be a long hole extending in the front-rear direction of the doctor back 4, for example. Further, the foreign substance dropping holes 44 may be arranged in a staggered manner.

  Further, the suction device is omitted, the foreign matter discharge path is inclined, and the fallen foreign matter flows out together with water etc. from the communication port formed at one end toward the discharge tube connected there. You may comprise as follows.

(A) And (b) is the schematic perspective view of the doctor apparatus to which this invention is applied, and its schematic sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Doctor apparatus 2 Doctor blade 2c Upper surface 3 of a doctor blade 3 Blade holder 4 Doctor back 10 Roll 10a Roll surface 35 Top plate 35b Top plate upper surface 41 Top plate part 43a, 43b End plate part 44 Foreign substance drop hole 45 Pipe 46 Communication port

Claims (3)

A doctor blade, a blade holder that holds the rear end side of the doctor blade, and a doctor back that supports the blade holder. The blade edge of the doctor blade is pressed against the surface of a roll such as a paper machine roll. In a doctor device that scrapes off foreign matter such as paper scraps adhered to the roll surface,
The blade holder includes an upper surface portion that receives foreign matter that is scraped off from the roll surface and fed backward from the surface of the doctor blade,
The doctor back receives a foreign object that is sent backward from the upper surface portion of the blade holder, a foreign substance drop hole formed in the top plate part, and a foreign substance that naturally falls from the foreign substance drop hole. and a foreign material discharge passage for discharging the,
The foreign substance drop hole is formed in a state of being separated into a plurality along the width direction of the doctor back in a portion near the rear end of the blade holder in the top plate portion,
The diameter of each foreign material drop hole is set to be smaller than the width dimension of the stock conveyed through the roll . In claim 1,
The doctor device, wherein a discharge port of the foreign matter discharge passage is formed in at least one end plate portion of the doctor back, and the foreign matter discharge passage is inclined toward the discharge port . In claim 2,
The said foreign substance fall hole is arrange | positioned at the said top-plate part in zigzag form, The doctor apparatus characterized by the above-mentioned .

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