JP3130096U - Drum-type self-cleaning doctor device - Google Patents

Abstract

To provide a drum type self-cleaning doctor device suitable for performing doctoring using a long doctor blade longer than a roll surface length.
In the drum-type self-cleaning doctor device 1, the mobile doctor blade 8 drawn out from the blade supply drum 11 in which the mobile doctor blade 8 is wound in a spiral shape passes through the doctor ring position 1a. It is pulled out to the blade collection drum 12. The blade recovery drum 12 is rotated by the motor 16 via the air clutch 15 to wind the portion of the mobile doctor blade 8 at the doctoring position 1a around the blade recovery drum 12, and a new mobile doctor from the blade supply drum 11 side. The part of the blade 8 is pulled out and moved to the doctoring position 1a. During the movement, the portion of the movable doctor blade 8 collected by the blade cleaning mechanism 18 is cleaned.
[Selection] Figure 1

Description

  The present invention relates to a doctor device used for scraping off foreign matters such as paper dust attached to the surface of a roll such as a paper machine roll or a steelmaking roll. More specifically, the present invention relates to a doctor device having a long doctor blade whose length is longer than the roll surface length (length in the roll axis direction) and movable in the roll surface length direction.

As a doctor device, there is known a device configured to scrape foreign matter adhering to the surface of the roll by pressing the blade edge of the doctor blade against the surface of the rotating roll. In addition, in this type of doctor device, if a long doctor blade that is sufficiently longer than the roll surface length is used as the doctor blade, and the cutting edge portion pressed against the roll surface is worn, a new cutting edge portion is It is known that the doctor blade is moved in the roll surface length direction until it comes into pressure contact with the roll surface to reduce the number of doctor blade replacements. For example, it is proposed in Patent Documents 1 and 2.
Japanese Patent Laid-Open No. 11-247087 JP 2000-334915 A

  The subject of this invention is providing the doctor apparatus provided with the moving mechanism suitable for moving a long doctor blade via a doctor ring position.

The drum-type self-cleaning doctor device of the present invention is
A blade supply drum for supplying a long doctor blade wound in a spiral;
A blade collection drum for winding and collecting a long doctor blade in a spiral shape; and
A blade moving mechanism for moving the doctor blade unwound from the blade supply drum toward the blade recovery drum via a doctoring position;
A blade support mechanism capable of press-contacting a portion of the doctor blade at the doctoring position to an outer peripheral surface of a roll to be doctored at the doctoring position;
A recovery-side blade cleaning mechanism for scraping off foreign matter adhering to the portion of the doctor blade before being wound around the blade recovery drum via the doctor ring position;
The blade moving mechanism is configured to switch a recovery-side motor for rotating the blade recovery drum in a direction in which the doctor blade is wound, and whether to transmit the rotational force of the recovery-side motor to the blade recovery drum. It is characterized by having a recovery side air clutch.

  Here, the long doctor blade wound around the blade recovery drum is scraped of foreign matters by the recovery side blade cleaning mechanism. Therefore, when the wear of the cutting edge of the long doctor blade is small, the long doctor blade can be used repeatedly by feeding back.

  In this case, in order to scrape off the foreign matter adhering to the portion of the doctor blade before being wound around the blade supply drum via the doctor ring position, for example, the pressure blade is pressed against both sides of the doctor blade. A supply-side blade cleaning mechanism having a configuration including a pair of doctor blades, and a supply-side motor for rotating the blade supply mechanism in a direction to wind up the doctor blade; What is necessary is just to set it as the structure provided with the supply side air clutch for switching whether the rotational force of a supply side motor is transmitted to the said blade supply drum.

  Further, in order to be able to change the installation position of the blade supply drum and the blade collection drum, the blade moving mechanism is provided between the doctor ring position and the blade supply drum, and between the doctor ring position and the blade supply drum. It is desirable to have a guide member such as a pulley for changing the moving direction of the doctor blade in at least one of the intervals.

  In the drum-type self-cleaning doctor device of the present invention, by using a motor and an air clutch, the blade supply drum or the blade recovery drum can be rotated to smoothly feed and take up the long doctor blade. it can. Further, by using a guide member such as a pulley, the winding direction of the long doctor blade can be changed, so that there is an advantage that the degree of freedom in layout is increased.

  Embodiments of a drum-type self-cleaning 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 the overall configuration of the drum-type self-cleaning doctor device. A drum-type self-cleaning doctor device 1 is for doctoring the outer peripheral surface of a roll 2 such as a paper machine roll, and is a blade support mechanism disposed at a doctoring position 1 a facing the outer peripheral surface of the roll 2. 3 is provided. The blade support mechanism 3 includes a holding blade 4 facing the outer peripheral surface of the roll 2, a blade holder 5 that holds the blade, and a doctor back 6 that supports the blade holder 5. Yes. The doctor back 6 is rotatably supported by brackets 7a and 7b arranged at fixed positions via journals 6a and 6b at both ends thereof. The holding blade 4 holds a long movable doctor blade 8 longer than the roll surface length L in a slidable state in the length direction.

  The drum-type self-cleaning doctor apparatus 1 includes a blade supply drum 11 in which the mobile doctor blade 8 is wound in a spiral shape, and a blade recovery drum 12 that winds and collects the mobile doctor blade 8 in a spiral shape. have. The blade supply drum 11 is rotationally driven by the rotation of the supply side motor 14 transmitted via the supply side air clutch 13. Similarly, the blade collection drum 12 is rotationally driven by the rotation of the collection side motor 16 transmitted via the collection side air clutch 15. These motors 14 and 16 and air clutches 13 and 15 constitute a blade moving mechanism.

  Further, a blade for scraping off foreign matter adhering to the surface of the portion of the movable doctor blade 8 moving (retracting BK) toward the blade supply drum 11 between the blade supply drum 11 and the doctor ring position 1a. A cleaning mechanism 17 is disposed. Similarly, between the blade collection drum 12 and the doctoring position 1a, the foreign matter adhering to the surface of the portion of the movable doctor blade 8 that moves toward the blade collection drum 12 (forward FR) is scraped off. A blade cleaning mechanism 18 is disposed. Each of the blade cleaning mechanisms 17 and 18 includes a pair of narrow doctor blades that are pressed against both surfaces of the movable doctor blade 8.

  The drive control of the drum type self-cleaning doctor apparatus 1 is performed by the control panel 21. The control panel 21 is configured to supply the supply-side motor 14 and the recovery-side motor 16 via the driver 24 based on the outputs of the supply-side blade sensor 22 and the recovery-side blade sensor 23 arranged on the moving path of the mobile doctor blade 8. And the air clutches 13 and 15 on the supply side and the recovery side are driven and controlled via the pneumatic circuit 25 to control the movable doctor blade 8 to move in the forward direction FR and the reverse direction BK.

  FIG. 2 is a schematic sectional view of the blade support mechanism 3, and FIG. 3 is a schematic sectional view showing the movable doctor blade 8 and the holding blade 4. As shown in these drawings, the mobile doctor blade 8 is a long blade having a constant width, with a blade edge 8a pressed against the outer peripheral surface 2a of the roll 2 formed on one edge. Is provided with an insertion portion 42 into which the other edge 8b of the movable doctor blade 8 is slidably inserted. The rear end portion of the holding blade 4 is detachably inserted into an insertion portion 51 formed at the tip of the blade holder 5.

  The blade holder 5 includes a top plate 52, finger plates 53 attached to the back surface side at regular intervals, and connecting rods 54 extending through the finger plates. Both ends of the connecting rod 54 are rotatably supported by brackets 63 and 64 fixed to the upper surface of the doctor back 6. The insertion portion 51 is defined by a tip portion of the top plate 52 and a tip portion of the finger plate 53.

  A bottom plate 65 is attached to the upper surface of the doctor back 6, and a pressurizing tube 55 and an opening tube 56 are disposed between the bottom plate 65 and the finger plate 53 of the blade holder 5 with a connecting rod 54 interposed therebetween. ing. These tubes 55 and 56 are connected to the compressed air supply source 82 side via a switching valve 81 in the pneumatic circuit 25. When compressed air is supplied to the pressurizing tube 55 to expand it and the opening tube 56 side is opened to the atmosphere, the blade holder 5 presses the holding blade 4 against the roll 2 side with the connecting rod 54 as the center. Turn. On the contrary, if the pressurizing tube 55 is opened to the atmosphere and compressed air is supplied to the opening tube 56 side, the blade holder 5 turns around the connecting rod 54 in a direction to separate the holding blade 4 from the roll 2. .

  As shown in FIG. 3, a finger 46 is attached to the surface side of the front end portion of the holding blade 4 by a mounting bracket 45, and a gap formed between the front end portion of the holding blade 4 and the finger 46 is formed. The insertion portion 42 of the movable doctor blade 8 is used.

  The rear end portion 43 of the holding blade 4 is inserted into an insertion portion 57 formed at the tip portion of the blade holder 5 and is held in a state of being sandwiched from above and below by a portion constituting the insertion portion 57, and The spring member 58 is biased. Further, a thin rubber plate 59 is sandwiched between the front end portion of the top plate 52 defining one side of the insertion portion 57 and the inserted holding blade 4. The rubber plate 59 has substantially the same length as the holding blade 4.

  FIG. 4 is a schematic configuration diagram of the collection-side blade cleaning mechanism 18. A collection-side blade cleaning mechanism 18 is disposed between the collection-side end of the insertion portion 42 of the blade holder 4 and the blade collection drum 12. Between the supply-side end of the insertion portion 42 and the blade supply drum 11, A supply-side blade cleaning mechanism 17 is disposed. Since both have the same structure, the structure of the collection-side blade cleaning mechanism 18 will be described below.

  The blade cleaning mechanism 18 includes doctor devices 120 and 130 having the same structure disposed on both sides of the movable doctor blade 8. These support doctor blades 121 and 131 having a slightly wider width than the movable doctor blade 8, blade holding parts 122 and 132 holding the doctor blades 121 and 131, and blade holding parts 122 and 132. The doctor backs 123 and 133 are provided.

  The blade holders 122 and 132 are provided with pressurizing tubes 124 and 134 and release tubes 125 and 135, respectively, and in the same manner as in the case of the main body portion of the doctor apparatus 1, by expanding and contracting these tubes. The pressure contact force of the doctor blades 121 and 131 with respect to the movable doctor blade 8 can be adjusted.

  In the drum-type self-cleaning doctor apparatus 1 having this configuration, the distal end portion of the movable doctor blade 8 drawn out from the blade supply drum 11 is drawn out via the doctoring position 1a and wound around the blade collection drum 12 on the opposite side. In this state, when the collection motor 16 of the blade collection drum 12 is rotated and the blade collection drum 12 is rotated by the rotational force transmitted through the air clutch 15, the mobile doctor blade 8 is wound around the blade collection drum 12. It is possible to form a state in which the movable doctor blade 8 is pulled out via the doctoring position 1a in a predetermined tension state.

  In this state, when the movable doctor blade 8 is brought into pressure contact with the outer peripheral surface 2a of the rotating roll 2 by the blade support mechanism 3, a foreign substance adhering to the outer peripheral surface 2a is scraped off.

  After doctoring for a predetermined period, the mobile doctor blade 8 is moved away from the outer peripheral surface 2a of the roll 2, the blade collecting drum 12 is wound up, and a new mobile doctor blade 8 portion is doctored. Move to position 1a. During this movement, the collection side blade cleaning mechanism 18 scrapes off the foreign matter adhering to the portion of the movable doctor blade 8 wound around the blade collection drum 12.

  After the mobile doctor blade 8 wound up on the blade supply drum 11 side disappears, the mobile doctor blade 8 can be moved in the backward direction to perform doctoring. In this case, the air clutch 15 on the blade collection drum 12 side is switched to a disconnected state, the air clutch 13 on the blade supply drum 11 side is connected, the motor 14 is driven to rotate, and the mobile doctor blade 8 is moved backward. Reverse the direction by a predetermined length and stop. Thereafter, doctoring is performed for a predetermined time. Such reverse feed and doctoring are repeated. In this case, the mobile doctor blade 8 wound around the blade supply drum 11 is cleaned by the blade cleaning mechanism 17 during reverse feeding.

  Note that the doctoring may be performed while the movable doctor blade 8 is continuously finely fed. In this case, the parts of the new mobile doctor blade 8 move sequentially through the doctoring position 1a.

  Here, as shown in FIG. 5, the installation position of the blade supply drum 11 can be changed by changing the moving direction of the movable doctor blade 8. In the illustrated example, a pulley 70 is used as a guide member for the movable doctor blade 8. A plurality of pulleys may be used. In addition, a guide member can be disposed on the blade collection drum 12 side in order to change the installation position of the blade collection drum 12.

1 is an overall configuration diagram of a drum-type self-cleaning doctor device to which the present invention is applied. It is a cross-sectional block diagram of the doctor apparatus of FIG. It is a schematic block diagram which shows the structure of the doctor blade of FIG. It is a schematic block diagram of the blade cleaning doctor apparatus of FIG. It is explanatory drawing which shows the case where the moving direction of a mobile doctor blade is changed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drum type self-cleaning doctor apparatus 1a Doctor ring position 2 Roll 2a Outer peripheral surface 3 Blade support mechanism 4 Holding blade 5 Blade holder 6 Doctor back 6, 6b Journal 7a, 7b Bracket 8 Mobile doctor blade 8a Cutting edge 8b Edge 11 Blade supply Drum 12 Blade recovery drum 13 Supply side air clutch 14 Supply side motor 15 Recovery side air clutch 16 Recovery side motors 17 and 18 Blade cleaning mechanism 21 Control panel 22 Supply side blade sensor 23 Recovery side blade sensor 24 Driver 25 Pneumatic circuit 42 Insertion part 43 Rear end portion 45 Mounting bracket 46 Finger 51 Insertion part 52 Top plate 53 Finger plate 54 Connecting rod 55 Pressurizing tube 56 Release tube 57 Insertion part 58 Spring part Material 59 Rubber plate 63, 64 Bracket 65 Bottom plate 70 Pulley 120, 130 Doctor device 121, 131 Doctor blade 122, 132 Blade holder 124, 134 Doctor back 124, 134 Pressurization tube 125, 135 Release tube

Claims (3)

A blade supply drum for supplying a long doctor blade wound in a spiral;
A blade collection drum for winding and collecting a long doctor blade in a spiral shape; and
A blade moving mechanism for moving the doctor blade unwound from the blade supply drum toward the blade recovery drum via a doctoring position;
A blade support mechanism capable of pressing the portion of the doctor blade at the doctoring position against the outer peripheral surface of a roll to be doctored at the doctoring position;
A collection-side blade cleaning mechanism for scraping off foreign matter adhering to the portion of the doctor blade before being wound around the blade collection drum via the doctor ring position;
The blade moving mechanism is configured to switch a recovery-side motor for rotating the blade recovery drum in a direction in which the doctor blade is wound, and whether to transmit the rotational force of the recovery-side motor to the blade recovery drum. A drum-type self-cleaning doctor device comprising a recovery-side air clutch. In claim 1,
A supply-side blade cleaning mechanism for scraping off foreign matter adhering to the portion of the doctor blade before being wound around the blade supply drum via the doctor ring position;
The blade moving mechanism is configured to switch a supply-side motor for rotating the blade supply drum in a direction in which the doctor blade is wound, and whether to transmit the rotational force of the supply-side motor to the blade supply drum. A drum-type self-cleaning doctor device comprising a supply-side air clutch. In claim 1 or 2,
The blade moving mechanism includes a pulley for changing a moving direction of the doctor blade between at least one of the doctor ring position and the blade supply drum and between the doctor ring position and the blade supply drum. The drum-type self-cleaning doctor apparatus characterized by having a guide member.

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