JP2012158840A - Doctor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a doctor device in which maintenance on a side of a blade holder holding a doctor blade may be easily performed and an air tube may be easily exchanged in particular.SOLUTION: A doctor device 1 comprises: a doctor blade 2 having, on a front side end thereof, a blade edge 2a to be pressed against a roll surface Ra, that is, a target of doctoring; a blade holder 3 holding the doctor blade 2; and a doctor back 4 supporting the blade holder 3. The blade holder 3 includes a pair of air tubes 8 and 9 for rocking a blade holder main body 6 holding the doctor blade. The blade holder 3 may be laterally inserted in and pulled out of the doctor back 4, and hence, an exchange operation for components of the blade holder 3 such as the air tubes 8 and 9 may be easily and safely performed.

Description

  The present invention relates to a doctor apparatus for scraping off paper dust, liquid and other foreign matters from the surface of a paper machine roll, a rolling roll, etc., and scraping off a liquid such as a coating liquid from the surface of a coating roll. The present invention relates to a doctor device having an excellent structure.

  As disclosed in Patent Documents 1 and 2, a doctor device for scraping off foreign matters such as paper dust attached to the surface of a paper machine roll is an elongated rectangular doctor with a blade edge pressed against the roll surface. The blade is generally composed of a blade, a blade holder that detachably holds the blade, and a doctor back that supports the blade holder.

  The blade holder is supported by a doctor back so that the attachment posture can be adjusted in the direction in which the cutting edge of the doctor blade approaches and leaves the roll surface. The doctor back is supported so as to be swingable about a support shaft, and the attachment posture is fixed by fastening means such as an air cylinder or a dan buckle. By adjusting the posture of the blade holder, the blade edge of the doctor blade held there can be brought into contact with the roll surface with an appropriate pressing force.

  As a mechanism for controlling the attitude of the blade holder, as disclosed in FIGS. 2 and 3 of Patent Document 1, a mechanism that adjusts by the screwing amount of the screw, and FIGS. 5, 6, and 8 of Patent Document 1 are disclosed. As disclosed in FIG. 2, a mechanism for expanding and contracting a pair of air tubes is known. In the latter air tube type mechanism, the blade holder is moved away from the roll surface by inflating the air tube arranged on the front side of the support shaft, which is the swing center of the blade holder, and contracting the rear air tube. It can be swung in the direction, and the doctor blade can be replaced. In addition, in a state where the blade edge of the doctor blade is pressed against the roll surface, the pressing force of the blade edge can be adjusted by expanding and contracting the pair of air tubes.

JP 2008-248429 A Japanese Utility Model Publication No. 5-45099

  Here, if the doctor back or the blade holder is moved away from the roll surface and the doctor blade is largely separated from the roll surface, only the doctor blade can be detached forward from the blade holder alone. Therefore, the doctor blade can be replaced relatively easily. On the other hand, the maintenance work of the blade holder is troublesome because it is necessary to disassemble the components of the blade holder after removing the doctor blade.

  In particular, in the case of an air tube type doctor device, the replacement frequency of the air tube made of a flexible material together with the doctor blade is higher than that of other components. In the work of exchanging the air tube, it is necessary to disassemble the blade holder after removing the doctor blade on the spot, but it is dangerous and serious in handling long parts and the like.

  Conventionally, as proposed in Patent Document 2, it has been proposed to easily replace the blade holder with the top plate of the blade holder, but in addition to this, maintenance on the blade holder side of the doctor device is also proposed. No proposals have been made to facilitate parts replacement.

  An object of the present invention is to propose a doctor device having a structure that can easily perform maintenance work on the blade holder side holding a doctor blade, particularly replacement work of an air tube.

In order to solve the above problems, the doctor device of the present invention is:
A doctor blade in which the cutting edge pressed against the surface of the roll to be doctored is formed along the edge on the front end side;
A blade holder holding the doctor blade;
A doctor back supporting the blade holder;
The blade holder is
A blade holder main body holding the rear edge side of the doctor blade opposite to the cutting edge in a state where it can be pulled forward;
A shaft support that supports the blade holder body so as to be swingable so that the cutting edge of the doctor blade moves toward and away from the roll surface;
A pair of air tubes for swinging the blade holder main body around the swing center of the shaft support,
The blade holder is attached to the doctor back in a state where it can be inserted and removed in a direction along the edge of the doctor blade.

  In the doctor device of the present invention, the blade holder can be inserted / removed in the lateral direction (direction along the edge where the blade edge of the doctor blade is formed) with respect to the doctor back. Therefore, when the blade holder is extracted from the doctor back in the horizontal direction, the blade holder and the doctor blade held by the blade holder can be extracted in the horizontal direction as an integrated unit. By taking out the extracted unit to a place where it is easy to work, it is possible to easily and safely replace components such as the air tube of the blade holder.

  Here, as a structure for enabling the blade holder to be inserted / removed from the doctor back, the first rail and the second rail connected to the blade holder so as to be relatively slidable only in the insertion / removal direction of the blade holder. It may be attached to the doctor back via a rail, and a fixing tool for fixing the blade holder at the insertion position may be attached in a detachable state between the doctor back and the blade holder.

  In this case, a concave groove is formed in one of the first rails, and the other second rail having a cross-sectional shape complementary to the concave groove may be inserted from the end of the concave groove in a slidable state. In the case of a doctor device used for a machine roll or the like, foreign matters such as paper dust tend to accumulate in the groove, between the rails, and in the gap between the rail attachment portions. It is desirable to be able to easily remove foreign substances accumulated in such a portion. Also, it is desirable to prevent the sliding of the rail from being difficult or impossible due to foreign matter accumulated in such a portion.

  Therefore, in the doctor device of the present invention, the first rail is provided with a concave groove extending in the insertion / removal direction, and the cross-sectional shape of the concave groove is wider than the width on the groove opening side. The second rail has a configuration in which a plurality of rail pieces having a cross-sectional shape complementary to the concave groove are arranged linearly at predetermined intervals along the insertion / removal direction; A rail is attached to the blade holder, and the second rail is attached to the doctor back.

  In the present invention, the first rail and the second rail are attached to the concave groove of the first rail in a state where the second rail is inserted from an end in the insertion / removal direction. It is characterized by a certain gap between the doctor back and the rail mounting surface.

  Thus, by dividing one rail, it is possible to suppress the accumulation of foreign matter in the groove and between the rails, and the foreign matter accumulated in the gap between the rail and the rail mounting surface can be easily removed. Further, it is possible to prevent the adverse effect that it becomes difficult to slide the rail and to pull out the blade holder due to the foreign matter clogged between the rails and between the rail and the rail mounting surface.

  Furthermore, in the present invention, in order to facilitate the operation of inserting the extracted blade holder, in each rail piece constituting the second rail, in the insertion direction with respect to the concave groove of the first rail. The end surface on the distal end side is a curved surface that is convex toward the insertion direction or a tapered surface that is tapered toward the insertion direction.

It is explanatory drawing which shows the structure at the time of seeing the doctor apparatus to which this invention is applied from the side. It is explanatory drawing shown in the state which decomposed | disassembled the principal part of the doctor apparatus of FIG. It is explanatory drawing which decomposes | disassembles and shows the principal part of the blade holder of the doctor apparatus of FIG. It is explanatory drawing which shows another example of a 2nd rail.

  Embodiments of a doctor apparatus to which the present invention is applied will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a configuration when the doctor device according to the present embodiment is viewed from the side. The overall configuration will be described with reference to this figure. The doctor device 1 is used for scraping off, for example, paper scraps attached to the roll surface Ra of the paper machine roll R, and is located in the vicinity of the roll surface Ra. 1 are arranged in a state along the roll surface length direction (direction orthogonal to the drawing).

  The doctor device 1 includes a doctor blade 2, a blade holder 3 that holds the doctor blade 2, and a doctor back 4 that supports the blade holder 3. The doctor blade 2 is a rectangular blade elongated in the surface length direction of the roll R, and a blade edge 2a is formed on the long side edge on the front end side in the short side direction. By pressing the blade edge 2a against the rotating roll surface Ra, the adhering material adhering to the roll surface Ra is scraped off. The blade holder 3 holds the portion on the long edge 2b side on the rear end side of the doctor blade 2 in a state of being sandwiched from above and below. The doctor back 4 supports the blade holder 3 in a state in which it can be inserted and removed in the blade long side direction (roll surface length direction) along the long side edge of the doctor blade 2. The doctor back 4 is generally supported by a fixed part (not shown) so as to be swingable in the vertical direction around the support shafts 5 attached to both ends thereof, and is tightened such as a turn buckle or an air cylinder. It is held in a fixed mounting posture by means (not shown).

  The blade holder 3 includes a blade holder main body 6 that holds a portion of the doctor blade 2 on the side of the long side edge 2b on the rear end side in a state where it can be pulled out forward. Also, the shaft holder 7 that supports the blade holder main body 6 so as to be swingable so that the blade edge 2a of the doctor blade 2 moves in a direction approaching and leaving the roll surface Ra (direction of arrow A). The shaft support portion 7 is provided with a pair of air tubes 8 and 9 for swinging the blade holder main body 6 around the swing center of the shaft support portion 7. The pair of air tubes 8 and 9 are arranged in parallel with the swing center 7a of the shaft support portion 7 interposed therebetween, and the air tube 8 located on the front side is in a direction to separate the blade holder main body portion 6 from the roll surface Ra. An open air tube for swinging, and a rear air tube 9 is a pressurizing air tube for swinging the blade holder main body 6 and pressing the doctor blade cutting edge 2a against the roll surface Ra. .

  FIG. 2 is an explanatory view showing the main part of the doctor device 1 of FIG. 1 in an exploded state, and FIG. 3 is an explanatory view showing the main part of the blade holder in an exploded state. Referring to these drawings, the blade holder main body 6 of the blade holder 3 includes a top plate 11 and a plurality of fingers 12 fixed to the back surface thereof at a constant interval. Each finger 12 is fixed to the back surface of the top plate 11 by a mounting screw 130. An L-shaped arm portion 12 a is formed on the front end side of each finger 12 to hold a portion on the rear end edge side of the doctor blade 2 from below. The doctor blade 2 is held by the blade holder 3 by inserting a portion on the rear end edge side of the doctor blade 2 from the front between the arm portion 12 a and the front end edge 11 a of the top plate 11. Further, on the lower surface of each finger 12, a rod through hole 12b protruding downward in a semicircular shape is formed in the center portion in the front-rear direction.

  The shaft support portion 7 that supports the blade holder main body portion 6 having this configuration includes a bottom plate 13 that is arranged in parallel to the top plate 11 with a predetermined interval below the fingers 12. Pivot fittings 14 are fixed to the central portion of the upper surface of the bottom plate 13 at regular intervals along the blade long side direction B. Each pivot fitting 14 has a plurality of positions on both sides of the fingers 12 located at both ends, and a plurality of pivot fittings 14. It is located in the gap between the fingers. A rod 15 is passed through the shaft hole 14 a of the pivot metal fitting 14 and the rod through hole 12 b of each finger 12, and the blade holder main body 6 can swing in the vertical direction around the rod 15.

  Further, between each finger 12 and the bottom plate 13, an opening air tube 8 and a pressurizing air tube 9 are arranged along the rod 15 on the front side and the rear side of the rod 15. By controlling the air supply to these air tubes 8 and 9 and controlling their expansion and contraction, the posture of the blade holder main body 6 can be adjusted, whereby the cutting edge 2a of the doctor blade 2 is moved to the roll surface Ra. It can be moved in the direction of approaching and leaving.

  Next, a structure in which the blade holder 3 can be inserted into and removed from the doctor back 4 in the blade long side direction B will be described with reference to FIGS. In this example, the blade holder 3 is supported by the doctor back 4 via the first rail 21 and the second rail 22 that are connected so as to be relatively slidable only in the lateral direction. In addition, a stopper plate 23 is disposed on the doctor back 4 between the blade holder 3 and the doctor back 4 in order to fix the blade holder 3 to the insertion position of the doctor back 4. The fixing bolt 24 can be detachably screwed and fixed.

  One of the first rails 21 is a linear rail extending in the blade long side direction B (hereinafter sometimes referred to as “insertion / removal direction B”) fixed to the lower surface of the bottom plate 13 on the blade holder 3 side. The groove 21a is formed in a state opening on the lower surface side. The concave groove 21a has a cross-sectional shape in which the width on the groove bottom 21c side is wider than the width on the groove opening 21b side.

  The other second rail 22 has a plurality of rail pieces 22 (n) (n = 1) arranged in a straight line at regular intervals along the insertion / removal direction B on the upper surface (rail mounting surface) 4a of the doctor back 4. 2, 3, ...). In the illustrated example, three rail pieces 22 (1), 22 (2), and 22 (3) are provided. A sufficient gap 25 is formed between the rail pieces 22 (1) to 22 (3) so as to be easily cleaned even if foreign matter such as paper dust accumulates.

  Each rail piece 22 (1) to 22 (3) has a T-shaped cross-sectional shape complementary to the concave groove 21a of the first rail 21, and is on the side of one end face 21d in the insertion / removal direction B of the concave groove 21a. Can be inserted into the concave groove 21a in a slidable state. In each rail piece 22 (1) to 22 (3), the end surface 22a on the insertion side with respect to the concave groove 21a is a curved end surface convex toward the insertion side so that the insertion can be performed smoothly and easily. It has become. The shape of the end surface 22a can be a tapered surface that is tapered toward the insertion side.

  Here, in the state where each rail piece 22 is mounted in the concave groove 21a, as can be seen from FIG. 1, the left and right lower surfaces 21e of the first rail 21 and the upper surface of the doctor back 4 to which the second rail 22 is attached. A sufficient gap 26 is set between 4a and 4a so that sliding between the first and second rails 21 and 22 is not hindered even if foreign matter such as paper dust accumulates. Yes.

  Next, the stopper plate 23 for fixing the blade holder 3 to the insertion position attached to the doctor back upper surface 4a is fixed to the end of the blade holder 3 on the front end side in the insertion direction B1 on the upper surface 4a. When the blade holder 3 is inserted, the end face of the first rail 21 in the insertion direction comes into contact with the stopper plate 23 and is positioned at the insertion position. A tap hole 4b for a stopper is formed at an end of the doctor back upper surface 4a on the rear end side in the insertion direction. In the state where the blade holder 3 is inserted, a bolt insertion hole 21f is formed at the end of the first rail 21 facing the tap hole 4b. After the blade holder 3 is inserted, the fixing bolt 24 is screwed into the tap hole 4b through the bolt insertion hole 21f, so that the blade holder 3 is inserted into the upper surface 4a of the doctor back 4 and fixed.

  In the doctor device 1 configured as described above, when the parts replacement work of the blade holder 3 such as the air tubes 8 and 9 is performed, the blade holder 3 is removed by loosening the fixing bolt 24 to remove the blade holder 3 from the upper surface 4a of the doctor back 4. Can be extracted in the extraction direction B2. The blade holder 3 can be pulled out and taken out to a safe place for work to be disassembled and replaced. Further, the blade holder 3 can be pulled out while the doctor blade 2 is held, or the blade holder 3 can be pulled out after the doctor blade 2 is removed.

  The extracted blade holder 3 positions the opening on the insertion side in the groove 21a of the first rail 21 on the end surface 22a on the front end side of the rail piece 22 (1) of the second rail 22 on the upper surface 4a of the doctor back 4. Then, it may be pushed toward the insertion direction B1. Since the end surface 22a on the front end side of each rail piece 22 has a convex curved surface, the insertion operation can be performed while being guided by the convex curved surface, so that the insertion operation can be performed smoothly and easily.

  Further, foreign matters such as paper dust scraped off from the roll surface Ra by doctoring by the doctor device 1 fall and accumulate on the first and second rails 21 and 22. In this example, the 2nd rail 22 of the upper surface 4a of the doctor back 4 is comprised from the split-type rail pieces 22 (1) -22 (3), and sufficient clearance gap 25 is formed among these. Therefore, paper dust accumulated between the rail pieces 22 (1) to 22 (3) and the upper surface 4a can be easily removed. When foreign matter such as paper dust enters between the concave groove 21a of the first rail 21 and the second rail 22, the foreign matter falls from the gap 25 between the rail pieces 22 (1) to 22 (3). Therefore, it is possible to prevent or suppress the adverse effect that foreign matter is clogged between the rails and it becomes difficult to slide the rails. Furthermore, since a sufficient gap 26 is formed between the upper surface 4a of the fixed doctor back 4 and the first rail 21 on the moving blade holder 3, the foreign matter accumulates between them. However, the sliding of the blade holder 3 is not hindered.

  In this example, the second rail 22 is composed of rail pieces 22 (1) to 22 (3) arranged at regular intervals. However, in the case where adverse effects due to adhesion of foreign matters such as paper dust do not matter. The second rail 22 may be a single rail.

  Moreover, as each rail piece which comprises the 2nd rail 22, as shown in FIG. 4, the disk-shaped head part 31 of fixed thickness and the column-shaped leg part 32 extended concentrically from here are provided. It is also possible to use a configuration in which rail pieces 30 having different shapes are arranged linearly at regular intervals. In FIG. 4, the other configuration is the same as that in FIG. 2, and thus the corresponding parts are denoted by the same reference numerals and description thereof is omitted.

DESCRIPTION OF SYMBOLS 1 Doctor apparatus 2 Doctor blade 2a Blade edge 2b Rear edge 3 Blade holder 4 Doctor back 4a Upper surface 4b Tap hole 5 Support shaft 6 Blade holder main body part 7 Support part 7a Oscillation center 8 Opening air tube 9 Pressurizing air tube 11 Top Plate 11a Front edge 12 Finger 12a Arm portion 12b Rod through hole 13 Bottom plate 14 Pivot bracket 14a Shaft hole 15 Rod 21 First rail 21a Groove 21b Groove opening 21c Groove bottom 21d End surface 21e Lower surface 21f Bolt insertion hole 22 Second rail 22 (1) to 22 (3) Rail piece 22a End face 23 Stopper plate 24 Fixing bolts 25 and 26 Gap 30 Rail piece 31 Head 32 Leg 130 Mounting screw

Claims (5)

A doctor blade (2) in which a cutting edge (2a) pressed against a roll surface (Ra) to be doctored is formed along an edge on the front end side;
A blade holder (3) holding the doctor blade (2);
A doctor back (4) supporting the blade holder (3);
The blade holder (3)
A blade holder main body (6) holding a rear edge side of the doctor blade (2) opposite to the cutting edge (2a) in a state where it can be pulled forward;
The blade holder main body (6) is supported in a swingable manner so that the cutting edge (2a) of the doctor blade (2) moves in a direction toward and away from the roll surface (Ra). A shaft support (7);
A pair of air tubes (8, 9) for swinging the blade holder body (6) around a swing center (7a) by the shaft support (7);
The doctor device (1), wherein the blade holder (3) is attached to the doctor back (4) in a state that it can be inserted and removed in a direction along the edge of the doctor blade (2). In claim 1,
The blade holder (3) is attached to the doctor back (4) via a first rail (21) and a second rail (22) which are connected so as to be relatively slidable only in the insertion / removal direction. And
Between the doctor back (4) and the blade holder (3), a fixing tool (24) for fixing the blade holder (3) in the insertion position is detachably attached. Doctor device (1). In claim 2,
The first rail (21) includes a groove (21a) extending in the insertion / removal direction, and the groove (21a) is wider on the groove bottom (21c) side than the groove opening (21b) side. Has a cross-sectional shape,
The second rail (22) has a predetermined number of rail pieces (22 (1) to 22 (3), 30) having a cross-sectional shape complementary to the concave groove (21a) along the insertion / removal direction. In a configuration arranged in a straight line at an interval (25) of
The doctor device (1), wherein the first rail (21) is attached to the blade holder (3), and the second rail (22) is attached to the doctor back (4). In claim 3,
In a state where the second rail (22) is inserted into the concave groove (21a) of the first rail (21), the first rail (21) and the second rail (22) are attached. A doctor device (1) characterized in that a constant gap (26) is formed between the doctor back (4) and the rail mounting surface (4a). In claim 3 or 4,
Each rail piece (22 (1) -22 (3), 30) which comprises the said 2nd rail (22) is the front end side of the insertion direction with respect to the said recessed groove (21a) of the said 1st rail (21). The end face (22a, 31) is a curved surface that is convex toward the insertion direction or a tapered surface that tapers toward the insertion direction.

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