JP4914698B2 - Multi-stage doctor device - Google Patents

Description

  The present invention relates to a doctor device used for scraping off foreign matter adhering to the outer peripheral surface of a roll such as a paper machine roll or a steelmaking roll. More specifically, the present invention relates to a multi-stage doctor device having a configuration in which a plurality of doctor devices are arranged in the circumferential direction along the outer peripheral surface of a roll.

In a multi-stage doctor device, for example, a two-stage doctor device in which two doctor devices are arranged in the circumferential direction along the outer peripheral surface of the roll, the roll is moved by the front-stage doctor device arranged upstream in the rotation direction of the roll. After the foreign matter adhering to the outer peripheral surface is scraped off, the foreign matter is scraped off again from the outer peripheral surface of the roll by the rear-stage doctor device disposed on the downstream side in the rotation direction. Therefore, foreign material that has not been scraped off by the front-stage doctor device, or fine foreign matter that has been scraped but has passed between the outer peripheral surface of the roll and the doctor blade of the front-stage doctor device, is reliably removed by the rear-stage doctor device. It can be removed from the surface. Such a multistage doctor device is disclosed in Patent Document 1.
Japanese Patent No. 2987110

  In the conventional multi-stage doctor device, the front-stage doctor device and the rear-stage doctor device are attached to the mount so as to be pivotable around a common support shaft, and the doctor blade in the front-stage doctor device that requires scraping ability is suitable for the outer peripheral surface of the roll The mounting position is adjusted so that it is pressed at a proper angle. For this reason, there exists a problem that the press-contact angle with respect to the roll outer peripheral surface of the doctor blade in the doctor apparatus of the back | latter stage cannot be adjusted.

  If a plurality of doctor devices are individually attached to form multiple stages, the pressure contact angle of the doctor blade in each doctor device can be set appropriately. However, this requires a lot of installation space and takes time for installation work, and is not practical.

  In view of these points, the problem of the present invention is to provide a multi-stage doctor device capable of adjusting the pressure contact angle with respect to the outer peripheral surface of the roll of the doctor blade of each stage of the doctor device without causing an increase in installation space and installation work time. It is to propose.

In order to solve the above problems, the multistage doctor device of the present invention is:
A first doctor device;
A second doctor device arranged parallel to the first doctor device, a turning holding mechanism for turning them around a common turning center axis and holding them at a predetermined turning position; and the second doctor device. And a holding mechanism holding the second doctor device at a predetermined slide position. It is characterized by having.

  In the multistage doctor device of the present invention, the first and second doctor devices are swiveled around a common swivel center axis. Less time is required and installation time is shorter.

  In addition, since the second doctor device is slidable with respect to the first doctor device, after setting the attachment position on the roll so that the pressure contact angle of the doctor blade of the first doctor device is an appropriate angle, By sliding the second doctor device, the pressure contact angle with respect to the outer peripheral surface of the roll of the doctor blade of the second doctor device can also be adjusted.

  Here, the swivel holding mechanism protrudes outwardly from a side plate attached to at least one side surface of the first doctor device and an outer surface of the side plate, and defines a turning center of the first doctor device. A first support shaft, a bearing that supports the first support shaft in a rotatable state, and a turnbuckle or an air cylinder for turning the first support shaft and holding it at a predetermined turning position. It can be set as the structure provided with.

  A second support shaft that defines a turning center of the second doctor device; and a turnbuckle that holds the second doctor device at a predetermined turning position around the second support shaft; The slide mechanism includes a shaft hole formed in the side plate, and the shaft hole can be rotated in a direction orthogonal to the second support shaft while the second support shaft is rotatable. What is necessary is just to make it the long hole inserted in.

  In the multistage doctor device of the present invention, the second doctor device is slidable in a direction perpendicular to the turning center axis with respect to the first doctor device. Therefore, the multi-stage doctor device is attached to the roll so that the pressure contact angle of the doctor blade in the first doctor device becomes an appropriate angle, and then the second doctor device is slid to obtain the doctor blade of the second doctor device. The pressure contact angle can be adjusted to an appropriate angle. Therefore, it is possible to realize a multistage doctor apparatus in which each stage of the doctor apparatus can be attached in an appropriate state without causing an increase in installation space and installation work time. As a result, the foreign substance scraping ability of the multistage doctor device can be enhanced as compared with the conventional art.

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

  FIG. 1A is a schematic side view showing a two-stage doctor device to which the present invention is applied, and FIG. 1B is a schematic cross-sectional view of a portion cut along the line bb. FIG. 2 is a schematic side view when the gantry is omitted.

  The two-stage doctor apparatus 1 includes a front-stage doctor apparatus 3 (first doctor apparatus) disposed on the upstream side in the rotation direction indicated by an arrow A along the outer peripheral surface 2a of the roll 2, and a rear-stage doctor apparatus disposed on the downstream side. 4 (second doctor device). These front and rear doctor devices 3 and 4 are arranged so as to be parallel to the central axis of the roll 2.

  The front and rear doctor devices 3 and 4 are held by a turning holding mechanism 5 at a predetermined turning position that is turned around a common turning center axis 1 a parallel to the axial direction of the roll 2. Further, the rear-stage doctor device 4 is supported by the slide mechanism 6 so as to be slidable in a direction perpendicular to the turning center axis 1 a with respect to the front-stage doctor device 3, and the holding mechanism 7 performs a predetermined operation by the slide mechanism 6. It is held in the slide position.

  The front-stage doctor device 3 includes a doctor blade 31 whose blade edge 31 a is pressed against the outer peripheral surface 2 a of the roll 2, a blade holder 32 that holds the doctor blade 31, and a doctor back 33 that supports the blade holder 32. And. Side plates 34 are fixed to both side ends of the doctor back 33, and first support shafts 35 that protrude outward at right angles are fixed to the outer surfaces of the side plates 34. The center axes of the left and right first support shafts 35 coincide with the turning center axis 1a. The shaft end portions of the left and right first support shafts 35 are supported in a rotatable state by bearings 9 attached to the left and right mounts 8, respectively. The mounting position of the bearing 9 can be adjusted in the approaching / separating direction with respect to the outer peripheral surface 2 a of the roll 2 by the adjusting bolt 10.

  Here, the swivel holding mechanism 5 includes an air cylinder 51 attached to one of the mounts 8 and a connecting plate 53 that connects between the telescopic rod 52 and the first support shaft 35 of the air cylinder 51. Yes. The connecting plate 53 extends in the radial direction of the first support shaft 35. One end of the connection plate 53 is fixed to the first support shaft 35, and the other end is rotatable about an axis parallel to the first support shaft 35. It is connected to the tip of 52.

  Next, the rear-stage doctor device 4 is disposed between the left and right side plates 34 of the front-stage doctor device 3, and holds the doctor blade 41 with a doctor blade 41 in which the cutting edge 41 a is pressed against the outer peripheral surface 2 a of the roll 2. And a doctor back 43 that supports the blade holder 42. Side plates 44 are fixed to both side ends of the doctor back 43, and second support shafts 45 projecting outward at right angles are fixed to the outer surfaces of the side plates 44. The left and right second support shafts 45 extend outward through the straight elongated holes 61 (shaft holes) formed in the left and right side plates 34 of the front-stage doctor device 3. In addition, a turnbuckle 46 is disposed to fix the rear-stage doctor device 4 at a predetermined turning position around the second support shaft 45. The turnbuckle 46 is stretched between the side plate 44 and the side plate 34 of the pre-stage doctor apparatus 3.

  The left and right elongated holes 61 function as the slide mechanism 6. That is, the left and right second support shafts 45 of the rear-stage doctor device 4 pass through the long holes 61 so as to be rotatable and slidable in a direction perpendicular to the second support shaft 45.

  A shaft end portion of the second support shaft 45 protruding outward from each elongated hole 61 is held by the holding mechanism 7. The holding mechanism 7 includes a bearing 71 that supports the second support shaft 45 in a rotatable state, a gantry 8 that supports the bearing 71 in a movable state over the sliding range of the elongated hole 61, and a bearing And an adjustment bolt 72 for adjusting the mounting position of 71.

  In the two-stage doctor apparatus 1 having this configuration, the front and rear doctor apparatuses 3 and 4 are attached to a common frame 8. The attachment position of the upstream doctor device 3 with respect to the outer peripheral surface 2a of the roll 2 is adjusted, and then the air cylinder 51 is driven to connect the entire multistage doctor device 1, that is, the first and second doctor devices 3 and 4 to a common first. By turning around the support shaft 34, it is possible to form a state in which the doctor blade 31 of the pre-stage doctor device 3 is in pressure contact with the outer peripheral surface 2a of the roll 2 at an appropriate pressure contact angle.

  After adjusting the attachment position of the front-stage doctor device 3, the rear-stage doctor device 4 is slid along the elongated hole 61 so that the pressure contact angle of the doctor blade 41 with respect to the outer peripheral surface 2a of the roll 2 is in an appropriate state. Can be adjusted. In the case shown in the figure, the downstream doctor device 4 can be slid upward to reduce the pressure contact angle, and can be slid downward to increase the pressure contact angle. After the rear-stage doctor device 4 is slid to an appropriate position, the bearing 71 supporting the second support shaft 45 may be fixed to the adjustment position by the adjustment bolt 72.

  In the two-stage doctor apparatus 1 of the present example, the doctor apparatuses 3 and 4 of the respective stages that are attached to the common base 8 and rotate integrally around the common first support shaft 35 are connected to the doctor blades 31, It can install so that 41 may be in the state press-contacted to the outer peripheral surface 2a of the roll 2 with an appropriate press-contact angle. Therefore, the doctor devices 3 and 4 at each stage can be installed in an appropriate state without increasing the installation space and the installation work time, and the overall foreign matter scraping ability can be enhanced.

(Other embodiments)
Although the above example relates to a two-stage doctor apparatus, the present invention can be similarly applied to a multi-stage doctor apparatus having three or more stages. In this case, a slide mechanism such as a long hole that supports the second-stage and third-stage doctor apparatuses in a slidable state may be attached to the side plate of the first-stage doctor apparatus. Further, a slide mechanism such as a long hole that supports the first-stage and third-stage doctor apparatuses in a slidable state may be attached to the side plate of the second-stage doctor apparatus.

  Also, as the doctor device at each stage, adopt a configuration in which the blade holder holding the doctor blade is attached to the doctor back so as to be able to turn in the approaching / separating direction with respect to the outer peripheral surface of the roll. Can do. As a turning mechanism of the blade holder, a mechanism using a pair of air tubes can be employed. Of course, doctor devices having various structures can also be used.

  Furthermore, in this example, the entire two-stage doctor device is swung around the first support shaft using an air cylinder, but may be fixed at a predetermined swiveling position using a mechanism such as a turnbuckle.

(a) is a schematic side view of the 2 step | paragraph doctor apparatus to which this invention is applied, (b) is a schematic fragmentary sectional view of the part cut | disconnected by the bb line. It is a schematic sectional drawing of the state which abbreviate | omitted the mount frame in the two-stage doctor apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 2 step | paragraph doctor apparatus 1a rotation center axis line 2 roll 2a outer peripheral surface 3 front stage doctor apparatus 4 back | latter stage doctor apparatus 5 rotation holding mechanism 6 slide mechanism 7 holding mechanism 8 mount 9 bearing 10 adjustment bolt 31 doctor blade 32 blade holder 33 doctor back 34 side plate 35 First support shaft 41 Doctor blade 42 Blade holder 43 Doctor back 44 Side plate 45 Second support shaft 46 Turn buckle 51 Air cylinder 52 Telescopic rod 53 Connection plate 61 Long hole 71 Bearing 72 Adjustment bolt

Claims (3)

A first doctor device;
A second doctor device arranged parallel to the first doctor device;
A turning holding mechanism for turning these around a common turning center axis and holding them at a predetermined turning position;
A slide mechanism that supports the second doctor device in a state slidable in a direction perpendicular to the turning center axis with respect to the first doctor device;
A multi-stage doctor device comprising a holding mechanism for holding the second doctor device at a predetermined slide position. In claim 1,
The swivel holding mechanism is
A side plate attached to at least one side surface of the first doctor device;
A first support shaft that protrudes outward from the outer surface of the side plate and that defines the pivot center of the first doctor device;
A bearing that supports the first support shaft in a rotatable state;
A multistage doctor device comprising a turnbuckle or an air cylinder for turning the first support shaft and holding it at a predetermined turning position. In claim 2,
A second support shaft defining a turning center of the second doctor device;
A turnbuckle that holds the second doctor device at a predetermined turning position around the second support shaft;
The slide mechanism includes a shaft hole formed in the side plate, and the shaft hole is configured such that the second support shaft is rotatable and is slidable in a direction perpendicular to the second support shaft. A multi-stage doctor device characterized by being a long hole inserted.

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