JPH10325094A - Doctor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the regeneration operation of a used mobile doctor blade in a doctor device equipped with a mobile doctor blade. SOLUTION: A doctor blade 3 in this doctor device 1 is constituted with a mobile doctor blade 31 of a narrow tape shape having the blade edge directly press-contacting with a roll surface 2a and a holding blade that holds the doctor blades slidably and detachably. The doctoring of the roll 2 is performed, as the mobile doctor blade 31 is conveyed in the longitudinal direction with a driving mechanism 100 at a constant speed. The part of the mobile doctor blade 31, after completion of the doctoring, passes through a doctoring means 110 for the blade to remove foreign substances sticking to its surface, then is wound up around a winding up roll 72 and recovered. A used mobile doctor blade 31 is freed from foreign substance and can be readily regenerated only by fitting a new blade edge to the edge of the doctor blade 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doctor device used for scraping paper debris or the like adhered to the surface of a roll such as a paper machine roll. More specifically, the present invention relates to a doctor device for performing doctoring of a roll surface while moving a tape-shaped doctor blade in a roll surface length direction.

[0002]

2. Description of the Related Art A doctor device is known in which a blade of a doctor blade is pressed against the surface of a roll such as a paper machine roll to scrape off foreign substances adhering to the surface. The support mechanism that supports the doctor blade allows the doctor blade, which usually has the length including the axial length of the roll surface (roll surface length), to be attached and detached, and to be pivotable in the direction to approach and move away from the roll surface. I support it. In the doctor ring, a doctor blade is swung toward the roll surface by a support mechanism, and the cutting edge is brought into contact with the roll surface at a predetermined pressure. When the roll rotates, paper scraps and the like adhering to the surface are scraped off by the blade edge of the doctor blade pressed against the surface. The cutting edge of the doctor blade is worn because it is in contact with the roll surface. Therefore, after a certain period of use, the doctor blade needs to be replaced with a new one.

A doctor device using a tape-shaped or long doctor blade instead of a doctor blade having a fixed length has been proposed. For example, U.S. Pat. Nos. 4,528,067 and 4,691,406 disclose a doctor device of this type. As disclosed in these, the tape-shaped doctor blade is wound in a coil shape, from which it is drawn out along a conveying path along the roll surface and wound again in a coil shape. Has become. At both ends of the roll surface, clamp mechanisms for fixing the drawn doctor blade so as not to move are installed.

In the doctor ring, the doctor blade is clamped so as not to move by these clamping mechanisms, and is pressed against the roll surface. After a predetermined period of use, the clamp mechanism is opened and the doctor blade is transported so that a new doctor blade portion faces the roll surface. Then, the doctor blade is fixed again by the clamp mechanism, and doctor ring is performed. In such a doctor device having a movable doctor blade, it is not necessary to remove the doctor blade from its support mechanism and replace it with a new one until the use of the coiled doctor blade is completed. Therefore, advantages such as an improvement in work efficiency and an operation rate of the apparatus can be obtained.

[0005]

Here, in the used doctor blade, the cutting edge formed on one edge of the used doctor blade is worn and the surface of the cutting edge or the doctor blade is scraped off from the roll surface. Foreign matter is attached. Therefore, in order to regenerate a used doctor blade, it is necessary to perform operations of polishing a worn blade edge and attaching a new blade edge, and operations of removing attached foreign matter.

SUMMARY OF THE INVENTION An object of the present invention is to propose a doctor device which can simplify or omit the work of removing foreign matter when a used tape-shaped doctor blade is reclaimed.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a tape-shaped doctor blade having a cutting edge pressed against a roll surface, and blade holding means for holding the doctor blade. And a doctor device having a blade conveying means for conveying the doctor blade in the longitudinal direction thereof and changing a part of the doctor blade held by the blade holding means, A configuration is adopted in which blade doctor means for scraping off foreign matter adhering to the surface of the doctor blade is arranged at a position downstream of the doctor blade in the transport direction.

After the doctoring of the tape-shaped doctor blade has been completed on the roll surface, foreign substances adhering to the surface of the doctor blade are removed by a doctor means for the blade. . Therefore, since foreign matter has already been removed from the used doctor blade, the foreign matter removing operation can be simplified or omitted when regenerating the used doctor blade.

Here, a configuration is provided in which a holding blade is provided which holds the doctor blade so as to be slidable in its longitudinal direction and is detachable, and the holding blade is detachably held by the blade holding means. It is desirable to adopt it.

In this case, only the portion of the holding blade that holds the doctor blade wears with the movement of the doctor blade. Therefore, the only part that needs to be replaced due to wear caused by the movement of the doctor blade is the holding blade. Therefore, it is not necessary to replace the entire blade holding means holding the doctor blade. Also, since the holding blade is detachable,
The replacement is easy.

Next, as the blade transport means, a low-speed motor for moving the doctor blade at a first speed, a high-speed motor for moving the doctor blade at a second speed higher than the first speed, and A configuration having a switching mechanism for switching between a low-speed motor and a high-speed motor can be employed. By making the moving speed of the doctor blade variable, doctor ring most suitable for the roll to be doctored can be performed.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS.
1 shows an overall configuration of a doctor device having a movable doctor blade to which the present invention is applied and a cross-sectional configuration thereof. In these figures, 1 is a doctor device, 2
Is a roll such as a paper machine roll whose surface is doctored by the doctor device 1. The doctor device 1 includes a doctor blade 3 facing the outer peripheral surface 2 a of the roll 2, a blade holder 4 holding the doctor blade 3, and a doctor back 5 supporting the blade holder 4. The back 5 is pivotably supported by brackets 61 and 62 disposed at fixed positions via journals 51 and 52 at both ends thereof.

The doctor blade 3 has a tape-shaped movable doctor blade 31 having a cutting edge 31a pressed against the roll surface 2a formed on one edge, and the other edge of the movable blade 31 is slidably inserted. Insertion part 3
2 comprises a holding blade 33 formed at the tip. The base end of the holding blade 33 is detachably inserted into an insertion portion 41 formed at the tip of the blade holder 4.

The blade holder 4 includes a top plate 4
2, finger plates 43 attached to the rear surface at regular intervals, and connecting rods 44 extending through the respective finger plates. Both ends of the connecting rod 44 are connected to the bracket 5 fixed to the upper surface of the doctor bag 5.
It is rotatably supported by 3, 54. The insertion portion 41 is defined by a tip portion of the top plate 42 and a tip portion of the finger plate 43.

Here, a bottom plate 55 is mounted on the upper surface of the doctor back 5, and between the bottom plate 55 and the finger plate 43 of the blade holder, a connecting rod 44 is sandwiched and a pressurizing tube 45 and an opening tube are provided. A tube 46 is arranged. These tubes 45 and 46 are connected to a compressed air supply source 48 via a switching valve 47. When compressed air is supplied to the pressurizing tube 45 to expand the tube, and the opening tube 46 is opened to the atmosphere, the blade holder 4 pivots around the connecting rod 44 in a direction to press the doctor blade 3 against the roll 2. . Conversely, if the pressurizing tube 45 is opened to the atmosphere and compressed air is supplied to the open tube 46, the blade holder 4 pivots about the connecting rod 44 in a direction in which the doctor blade 3 is separated from the roll 2.

Next, FIG. 3 shows the configuration of the doctor blade 3. As shown in this figure, the doctor blade 3 has an extremely thin movable doctor blade 31 having a small width,
It is composed of a wide holding blade 33. A finger 36 is attached to the front surface side of the tip portion 33a of the holding blade 33 by an attachment bracket 35.
The gap formed between the tip portion 33a of the blade and the finger 36 corresponds to the insertion portion 3 of the movable doctor blade 31.
It is 2.

The base end side 33b of the holding blade 33
Is an insertion portion 4 formed at the tip of the blade holder 4.
1 and is held in a state sandwiched from above and below by a portion constituting the insertion portion, and is urged by a spring member 49. Furthermore, between the tip of the top plate 42 defining one side of the insertion portion 41 and the inserted holding blade 33,
A thin rubber plate 39 is sandwiched. The rubber plate 39 has substantially the same length as the holding blade 33.

Referring again to FIG. 1, the movable doctor blade 31 is in a tape shape, and is bridged between a supply roll 71 and a take-up roll 72.
A portion in the middle of these rolls 71 and 72 is slidably inserted into an insertion portion 32 formed at the tip of the holding blade 33.

The movable doctor blade 31 is transported by a transport mechanism 100 that rotates the take-up roll 72. The transport mechanism 100 includes a low-speed motor 102 and a high-speed motor 103 connected to the take-up roll 72 via a power switching mechanism 101. These motors 102 and 103 are motor drivers 104
The driving is controlled by the control circuit 105 via the. The power switching mechanism 101 includes, for example, a clutch mechanism, and the switching of the clutch mechanism is performed under the control of the control circuit 105 via the driver 106, and the motors 102, 103
Is selectively connected to the take-up roll 72. In general, the power switching mechanism 101 includes a clutch mechanism as well as a speed reduction mechanism.

For example, the moving speed of the movable doctor blade 31 when the low-speed motor 102 is used is set to a speed of moving by the surface length of the roll 2 per day. On the other hand, the moving speed of the movable doctor blade 31 when the high-speed motor 103 is used is set to be 500 to 2000 times the moving speed of the low-speed motor 102.
Further, as the motor driver 104, one that includes an inverter and that can continuously change the rotation speed of the motors 102 and 103 may be employed.

Next, clamp mechanisms 81 and 82 are arranged at fixed positions near both ends of the roller 2 to be doctored. Mobile doctor blade 3
1 is conveyed from the supply roll 71 through the insertion portion 32 at the tip of the holding blade via the clamp mechanism 81, and via the clamp mechanism 82 on the opposite side along the conveyance path reaching the take-up roll 72. You. Clamp mechanism 81, 8
Reference numeral 2 indicates that the movable doctor blade 31 can be switched between a state where the movable doctor blade 31 is clamped by a predetermined force and a state where the movable doctor blade 31 is released by a driving mechanism (not shown).

The clamping force by these clamping mechanisms 81 and 82 is set as follows. That is, in the clamped state, the movable doctor blade 31 can be moved, but the movable doctor blade 31 located between these clamp mechanisms 81 and 82 holds these clamp mechanisms 81 while maintaining a predetermined tension. , 82.

Here, between the clamp mechanism 82 and the take-up roll 72, a doctor means 110 for a blade is arranged. FIG. 4 shows the doctor means 110 for the blade.
The main structural parts of are shown. The doctor blade means 110 has a doctor device 12 for blades having the same structure and arranged on both sides of a movable doctor blade 31 to be conveyed.
0, 130 are provided. These blade doctor devices 120 and 130 include doctor blades 121 and 131 having a wider width than the movable doctor blade 31, blade holding units 122 and 132 holding the doctor blades 121 and 131, and blade holding units 122. , 132
Are provided with doctor backs 123 and 133 that support.

The blade holding portions 122 and 132 include pressure tubes 124 and 134 and opening tubes 125 and 13.
5 as in the case of the doctor device 1 described above, by expanding and contracting these tubes,
The pressing force of the doctor blades 121 and 131 against the movable doctor blade 31 can be adjusted.

The replaceable doctor blade 31 of this embodiment
Has a thickness of about 0.5 mm or less, and has a tip 3
1a is a cutting edge pressed against the roll surface 2a. In the present example, the cutting edge angle remains at about 90 degrees, and the cutting edge processing is not particularly performed.

The operation of the thus-configured doctor device 1 will be described. The movable doctor blade 31 is continuously conveyed at a predetermined speed by the driving mechanism 100, and a portion of the movable doctor blade 31 conveyed by the both clamping mechanisms 81 and 82 facing the surface 2a of the roll 2 is fixed by a predetermined amount. Tension under tension. Next, compressed air is supplied to the pressurizing tube 45 to expand it, and the opening tube 46 is opened to the atmosphere. As a result, the doctor blade 3 turns toward the surface 2a of the roll 2 and is pressed against it. That is, the cutting edge 31a of the movable doctor blade 31 on the distal end side of the doctor blade 3 is pressed against the roll surface 2a. The pressing force of the movable doctor blade 31 against the roll surface 2a can be maintained at a desired value by controlling the supply and discharge of compressed air to and from the pair of tubes 45 and 46.

When the roll 2 rotates in this state, the foreign matter adhering to the surface 2a is scraped off by the cutting edge 31a of the movable doctor blade 31. In other words, doctoring of the surface 2a of the roll 2 is performed.

When the doctor blade 3 is pressed against the roll surface 2a, the narrow tape-shaped movable doctor blade 31 is largely bent, but the side of the wide holding blade 33 holding the doctor blade is large. It does not bend as much. Therefore, the amount of deflection of the entire doctor blade can be suppressed to be equal to that of the conventional doctor blade. As a result, the blade edge 31a of the extremely thin movable doctor blade 31 can be pressed against the roll surface 2a with an appropriate touch. Since the cutting edge 31a of the movable doctor blade 31 is extremely thin, it comes into close contact with the roll surface. Therefore, by using the doctor blade 3 of this example, appropriate doctor ring can be realized.

Further, since the ultra-thin movable doctor blade 31 can be used as described above, it is not necessary to sharpen the cutting edge of the cutting edge 31a. Therefore, there is also an advantage that the cutting edge processing step can be omitted from the doctor blade manufacturing step.

Further, if an existing doctor blade is used as the above-mentioned holding blade 33 and an insertion portion of the movable doctor blade 31 is formed at the distal end thereof, the doctor blade of this embodiment can be formed. The material of the movable doctor blade 31 and the holding blade 33 may be the same as the existing doctor blade.

Next, the portion of the movable doctor blade 31 after the doctoring of the roll surface 2a is taken up by the take-up roll 72 from the clamping mechanism 82 via the blade doctor means 110. Mobile doctor blade 31 passing through blade doctor means 110
As shown in FIG. 4, foreign matter adhering to both side surfaces is scraped off by doctor blades 121 and 131. Therefore, the used mobile doctor blade 31
Is taken up by a take-up roll 72 after the foreign matter is removed.

As described above, in the doctor device 1 according to the present embodiment, the movable doctor blade 31 is collected in a state where foreign matters have been removed. Therefore, in order to regenerate the used mobile doctor blade 31 that has been collected, it is only necessary to process the edge of the doctor blade and attach a new cutting edge, and to omit or simplify the work of removing foreign substances adhering to the surface. The advantage that it can be obtained is obtained.

On the other hand, in the doctor device 1 of the present embodiment, the doctor blade 3 having a structure in which the movable doctor blade 31 is detachably held at the tip of the holding blade 33 is adopted. Therefore, compared to the conventional mobile doctor blade that transports the entire doctor blade 3,
The movable doctor blade 31, which is a part of the doctor blade actually conveyed, is narrow and thin. Therefore, there is an advantage that the transfer force (tensile force) of the doctor blade may be small.

Further, since a path for transporting the mobile doctor blade 31 having a small width and a small width may be formed around the roll 2, a path for transporting all of the doctor blades is formed around the roll as in the related art. As compared with the case, the device configuration can be made small and compact.

Further, when the movable doctor blade 31 is transported, a lateral force acts on the holding blade 33 side. The holding blade 33 is inserted into the insertion portion 41 at the tip of the blade holder 4 and is held by the spring member 49, and is not fixed by a bolt or the like. For this reason, there is a possibility that the holding blade 33 is moved by the sliding frictional force generated between the transported movable doctor blade 31 and the holding blade 33 and comes out of the insertion portion 41. However, in this example, since the rubber plate is sandwiched between the insertion portions 41, the holding blade 33 can be prevented from slipping (pulling resistance can be increased), and the holding blade 33 can be prevented from coming off.

Further, since the rubber plate is sandwiched in this way, there is also an advantage that the elastic force of the rubber plate softens the contact of the doctor blade 3 with the surface 2a of the roll 3.

[0037]

As described above, according to the present invention, in a doctor device having a movable doctor blade, foreign matter adhering to the surface of the movable doctor blade collected after finishing the doctoring of the roll surface is scraped. A configuration having doctor means for a blade to be dropped is adopted. Therefore, since the used mobile doctor blade can be collected in a state where the foreign matter has been removed, the operation for regenerating the mobile doctor blade is simplified.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a doctor device to which the present invention is applied.

FIG. 2 is a sectional configuration view of the doctor device of FIG.

FIG. 3 is a schematic configuration diagram showing a configuration of a doctor blade of FIG. 1;

FIG. 4 is a structural view of a main part of the blade doctor means of FIG. 1;

[Explanation of symbols]

 Reference Signs List 1 doctor device 2 roll 2a roll surface 3 doctor blade 31 movable doctor blade 32 insertion portion 33 holding blade 39 rubber plate 4 blade holder 41 insertion portion 45 pressurizing tube 46 opening tube 5 doctor back 100 drive mechanism 101 power switching mechanism Reference Signs List 102 Low-speed motor 103 High-speed motor 104 Motor driver 105 Control circuit 110 Doctor means for blades 120, 130 Doctor device 121, 131 Doctor blade

Claims (4)

[Claims] 1. A tape-shaped doctor blade having a cutting edge pressed against a roll surface, blade holding means for holding the doctor blade, and conveying the doctor blade in a longitudinal direction thereof, and the blade holding means A blade conveying means for changing a portion of the doctor blade being held, wherein the doctor blade has a surface on the downstream side of the doctor blade in the conveying direction of the doctor blade with respect to the blade holding means. A doctor device, wherein a doctor means for a blade for scraping foreign matter adhering to the device is arranged. 2. The high-speed motor according to claim 1, wherein the blade transport means moves the doctor blade at a first speed and a low-speed motor that moves the doctor blade at a second speed higher than the first speed. And a switching mechanism for switching between the low-speed motor and the high-speed motor. 3. The blade according to claim 1, further comprising a holding blade that holds the doctor blade in a longitudinally slidable manner and detachably, wherein the holding blade is detachable by the blade holding means. A doctor device characterized by being held as possible. 4. A tape-shaped doctor blade provided with a blade that is pressed against a roll surface, blade holding means for holding the doctor blade, and transporting the doctor blade in its longitudinal direction. A doctor device having blade conveying means for changing a part of the doctor blade held, wherein the blade conveying means comprises: a low-speed motor for moving the doctor blade at a first speed; A doctor device comprising: a high-speed motor that moves at a second speed higher than the second speed; and a switching mechanism that switches between the low-speed motor and the high-speed motor.