JPH1037094A - Sliding doctor device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To propose a doctor device capable of performing doctoring efficiently with an appropriate pressure contact force. A doctor device (1) supports a blade holder (5) so as to be able to linearly reciprocate in a roll axis direction by a linear slide mechanism (4) attached to a doctor bag (3). The blade holder 5 holds a doctor blade 6 having a small width. The doctor blade 6 is pressed against the roll outer peripheral surface 10A, and in this state, doctoring of the roll outer peripheral surface is performed while the doctor blade 6 is slid in the roll axis direction. Via the manual operation panel 120, the doctor blade 6 can be pressurized and released, start and stop of sliding, and setting of a moving range can be performed. Therefore, it is possible to prevent the blade edge of the doctor blade 6 from being overheated, and it is also possible to perform doctoring of only a necessary portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a doctor device for removing foreign matter such as paper residue from an outer peripheral surface of a roll such as a paper machine roll by pressing a doctor blade against the outer peripheral surface thereof.

[0002]

2. Description of the Related Art Doctor devices are widely used in fields where rolls are used in manufacturing or processing steps, such as the paper industry. For example, a doctor device is used to remove foreign matters such as paper scum attached to the surface of a paper machine roll.

[0003] The doctor device is provided with a doctor blade having a length extending over the entire outer peripheral surface width (length in the axial direction) of the roll to be treated. By pressing the blade edge of the doctor blade against the outer peripheral surface of the rotating roll with an appropriate pressing force, foreign matters can be scraped off from the outer peripheral surface of the roll.

[0004] Scratching operation of foreign matter (doctor ring)
In order to perform properly, the cutting edge of the doctor blade,
It is necessary to form a state in which the roll is pressed against the outer peripheral surface of the roll with a uniform pressing force over the entire width. However, the roll surface is not flat but slightly uneven. There is also a manufacturing error on the blade edge side of the doctor blade.

[0005] For this reason, there is a case where the pressing force is too high in a certain portion of the blade of the doctor blade and too low in other portions. In this case, in a portion where the pressing force is too high, the cutting edge of the doctor blade is greatly worn. Conversely, in a portion where the pressing force is too low, the foreign matter is not sufficiently scraped off and remains on the outer peripheral surface of the roll.

On the other hand, in order to perform doctoring of a long roll, it is necessary to use a long doctor blade corresponding to the roll width. In this case, the required pressing force may not be obtained unless the doctor blade is pressed against the roll with a large force as a whole.

[0007]

As described above, in a commonly used doctor device, it may be difficult to set the pressing force of the doctor blade to an appropriate state.

An object of the present invention is to propose a doctor device capable of always pressing a blade edge of a doctor blade against an outer peripheral surface of a roll in an appropriate state and constantly performing a proper foreign matter scraping operation.

Another object of the present invention is to propose a doctor device capable of performing appropriate doctoring according to the heat generation state of a doctor blade.

A further object of the present invention is to propose a doctor device capable of performing appropriate doctoring according to the degree of contamination on the outer peripheral surface of the roll.

[0011]

According to the present invention, a doctor blade having a fixed width is pressed against the outer peripheral surface of a roll,
The present invention relates to a sliding doctor device that removes foreign matter from the outer peripheral surface of the roll at different positions in the axial direction by sliding the doctor blade along the outer peripheral surface of the roll in the axial direction thereof. Is adopted.

That is, a slide switch for inputting an instruction to start and stop the sliding of the doctor blade, and a switch for switching the doctor blade between a pressurized state in which the doctor blade is pressed against the outer peripheral surface of the roll and an open state separated from the outer peripheral surface of the roll. And a pressure / open switch for inputting an instruction to switch the doctor blade between a pressurized state and an open state.

According to this configuration, doctor ring can be performed by sliding the doctor blade from a target position on the outer peripheral surface of the roll. In addition, when the blade edge of the doctor blade falls into an overheated state, the doctor blade can be opened and cooled.

Further, the present invention employs a configuration in which the sliding range of the doctor blade can be changed. With this configuration, for example, doctoring can be performed intensively on a portion where a large amount of foreign matter is attached.

Further, according to the present invention, in order to automatically perform doctoring without manual operation, a sliding control means for controlling the sliding of the doctor blade, and a heat generating means for detecting a heating state of the doctor blade are provided. A configuration having state detection means is employed. According to this configuration, the sliding control unit drives the pressurizing / opening unit when the heating state detecting unit detects that the doctor blade has reached a temperature higher than a predetermined temperature. Thus, the doctor blade can be switched to the open state, so that the overheating state of the blade of the doctor blade can be reliably avoided.

Instead of arranging such detection means, a timer function may be used to avoid overheating of the blade of the doctor blade. That is, the sliding control means is provided with a timer function, and every time a preset time elapses, the pressure / opening means is driven to switch the doctor blade to the open state for a fixed time. Good.

Further, if a structure provided with a dirt detecting means for detecting the dirt condition on the outer peripheral surface of the roll is adopted, it is convenient because it is possible to automatically and intensively doctor a portion where a large amount of foreign matter adheres. .

In the present invention, the width of the doctor blade is set so as to be equal to or less than half the axial length of the target roll. Preferably, about 50 m
The distance is set within a range from m to about 500 mm. More preferably, it is set to about 100 mm.

Further, in a preferred embodiment of the present invention, the doctor blade can be moved at different speeds in the axial direction of the roll.

On the other hand, the present invention relates to a multi-stage doctor device, which is provided with a sliding doctor device having the above-mentioned configuration, and is disposed at a position upstream of the sliding doctor device in the roll rotation direction and has substantially the same width as the roll width. A doctor device for performing doctoring of the outer peripheral surface of the roll using a doctor blade having a width. According to this configuration, doctoring of the entire width of the roll is performed by a general doctor device on the upstream side, and the residue on the surface is removed.
Next, using a sliding doctor device, the paper residue and the like that are partially adhered are removed. By performing doctoring in two stages in this manner, efficient doctoring can be realized.

As described above, in the present invention, foreign matter is scraped off from the outer peripheral surface of the roll while the doctor blade slides in the roll axis direction. Therefore, a doctor blade having a width smaller than the roll width can be used. As a result, it becomes easy to form a state in which all the cutting edges of the doctor blade are pressed against the outer peripheral surface of the roll with an appropriate pressing force. Further, since the width of the doctor blade is narrow, a necessary pressure contact force can be generated without pressing the doctor blade against the roll with a large force as a whole. Further, since a doctor blade having a small width may be used, the replacement operation or the like is simplified.

Further, according to the present invention, since excessive heat generation of the doctor blade can be avoided, excessive wear of the doctor blade or the outer peripheral surface of the roll can be prevented.

Further, the sliding range of the doctor blade can be changed. Therefore, for example, it is possible to doctor only a portion of the outer peripheral surface of the roll that is very dirty. For this reason, compared with the case where the outer peripheral surface of the roll is completely doctored, advantages such as the ability to remove foreign matters more efficiently are obtained.

[0024]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an example in which the present invention is applied to a doctor device for doctoring the outer peripheral surface of a roll for a paper machine.

As shown in these figures, the doctor device 1
Are supporting frames 21 and 22 on both sides, a doctor bag 3 rotatably supported by the frames 21 and 22, a linear slide mechanism 4 supported by the doctor back 3, and a linear slide The blade holder 5 is supported by the mechanism 4 so as to be capable of linear reciprocating movement, and the doctor blade 6 is held by the blade holder 5.

The structure of each of the above parts will be described in detail. First, the doctor back 3 is provided with support shafts 31 and 32 at both ends thereof, and these support shafts 31 and 32 are rotatably supported by bearings on the frames 21 and 22 side, respectively. The linear slide mechanism 4 supported by the doctor back 3 is, for example, a belt-type LM guide manufactured by THK Corporation.

The linear slide mechanism 4 linearly reciprocates along the base 41 attached to the doctor bag 3, the front and rear linear slide rails 42 and 43 formed on the base 41, and the linear slide rails 42 and 43. The slide table 44 is provided. The back surface of the slide table 44 is connected to a driving belt 45. The driving belt 45 is stretched between a driving pulley 46 at one end and a driven pulley 47 at the other end, and extends in parallel with the slide rails 42 and 43.
The driving pulley 46 is provided with an AC servomotor 4 as a driving source.
8 is fixed to the output shaft. When the motor 48 is driven, the slide table 44 is linearly moved along the rails 42 and 43 by the driving belt 45. If the motor 48 is reversed, it moves linearly in the opposite direction.

The blade holder 5 is mounted on the slide table 44. Blade holder 5
Has a top plate 51 and a number of fingers 52 attached to the back side of the top plate 51.
The front end portion of the doctor blade 6 is held between the front end portions of these members 51 and 52 in a detachable state. Each finger 52 has a rod 53 penetrating the center thereof. Both ends of the rod 53
It is supported on the slide table 44 side in a rotatable state.

Here, a gap is formed between the back surface of the finger 52 and the slide table 44, and a small gap is formed on the front side (ie, the side of the roll 10) with the rod 53 therebetween, and a large gap is formed on the rear side. A gap is formed.
A small-diameter air tube 54 and a large-diameter air tube 55 are mounted in these gaps. By adjusting the amount of air supplied to these tubes 54 and 55, the doctor blade 6 is
It is possible to switch between a pressed state in which the roll is in contact with the roll outer peripheral surface 10a and an open state in which the pressed state is separated therefrom. That is,
By expanding the large-diameter tube 55 on the rear side and contracting the small-diameter tube 54, the pressing force of the cutting edge 6a of the doctor blade 6 against the roll outer peripheral surface 10a can be increased. Conversely, by expanding the small-diameter tube 54 and contracting the large-diameter tube 55, the pressure contact force of the doctor blade can be reduced. Further, the doctor blade 6 can be set in an open state away from the outer peripheral surface of the roll (this state is indicated by an imaginary line in the figure).

Next, with reference to FIG. 2, the lengths and moving ranges of the above-described portions will be described. As shown in the figure, the surface length (the length in the axial direction) of the roll 10 is L10. The length L3 of the doctor back 3 supporting the linear slide mechanism 4 is set to be sufficiently longer than the roll surface length L10. As a result, the moving range of the slide table 44 of the linear slide mechanism 4 can be set to be wider than the roll surface length L10.

In this embodiment, the length L5 of the blade holder 5
Is set to, for example, 120 mm, and the length L6 of the doctor blade 6 held here is set to, for example, 100 mm.
Is set to In order to allow the doctor blade 6 to slide from one end of the roll outer peripheral surface to the other end, that is, to allow the doctor blade 6 to move from one end indicated by a solid line to the other end indicated by an imaginary line in FIG. The blade movement amount L is set to be smaller by 50 mm on the left and right sides than the roll surface length L10.

In order to control the moving range of the doctor blade 6 in this way, limit switches and the like for specifying the moving range are arranged, and the motor 48 is controlled based on the output signals of these limit switches. What is necessary is to control. In FIG. 2, the motor 48 is connected to a power cable 48b and a detector cable 48c for transmitting a signal from a limit switch or the like, to a control base thereof.

The thus configured doctor device 1 of the present embodiment
, The roll 10 for rotating the doctor blade 6
The blade holder 5 holding the doctor blade 6 is reciprocated in the roll axis direction by a motor 48 by pressing the doctor blade 6 against the surface 10 </ b> A with an appropriate pressing force. As a result, the doctor blade 6 performs doctoring of the roll outer peripheral surface 10A while sliding in the axial direction along the roll outer peripheral surface 10A.

Since the width of the doctor blade 6 of this embodiment is small, it is possible to easily adjust the pressing force against the outer peripheral surface 10A of the roll. If a motor having a variable rotation speed is used as the motor 48, the sliding speed of the doctor blade 6 can be changed. In this way, the doctor ring of the portion of the roll outer peripheral surface 10A to which foreign matter such as paper residue easily adheres is performed sufficiently by lowering the sliding speed,
By performing the other parts at a high sliding speed, efficient doctoring can be realized.

As shown by imaginary lines in FIG.
The cover 11 is attached to the blade holder 5 so as to cover the moving blade holder 5, and a nozzle 12 capable of spraying a chemical solution or air to the blade of the doctor blade 6 can be attached inside the cover 11. This configuration is preferable because even if foreign matters such as scraps of paper that have been scraped off accumulate on the blade edge of the doctor blade 6, they can be efficiently discharged to the outside.

Next, a control mechanism of the sliding doctor device of this embodiment will be described mainly with reference to FIG.

In the figure, a slide control circuit 100 controls the drive of a linear slide mechanism 4 to control the slide of a doctor blade 6 held by a blade holder 5 supported by the linear slide mechanism 4. . Detection signals are input to the sliding control circuit 100 from left and right sensors 131 and 132 that define the maximum movement range of the doctor blade. Further, the timer circuit 101 and the manual operation panel 120 are connected.

Next, the pressurizing / releasing circuit 110 supplies and discharges air to and from the pair of air tubes 54 and 55 of the blade holder 5, thereby expanding and contracting these tubes to make a doctor blade. 6 is a pneumatic circuit for switching between a pressurized state in which the roller 6 is pressed against the roll outer peripheral surface 10A and an open state separated from the roll outer peripheral surface 10A.

The manual operation panel 120 includes a pressure switch 121 for switching between pressurization and release, and a release switch 122.
And a slide start switch 123 for starting the doctor blade 6 to slide along the roll outer peripheral surface 10A and a slide stop switch 124 for stopping the slide start switch 123. Further, a switch group 125 for designating and inputting the movement range of the doctor blade 6 by inputting coordinates between the maximum movement ranges defined by the sensors 131 and 132 is provided. Furthermore, a mode switch 126 for switching the operation mode of the doctor device 1 is provided. The operation mode includes, for example, an automatic mode and a manual mode.

When the manual mode is selected by the mode changeover switch 126, doctoring is performed as follows. First, the doctor switch 6 is pressed against the roll outer peripheral surface 10A with an appropriate pressing force by operating the pressure switch 121. Next, the slide start switch 123 is operated, the motor 48 is driven, and the slide of the doctor blade 6 held by the blade holder 5 by the linear slide mechanism 4 is started. Thereafter, the doctor blade 6 is moved by the linear slide mechanism 4 to the sensor 131,
The doctor moves the roll outer peripheral surface 10A by reciprocating in the maximum movement range defined by 132.

Here, for example, when the operator determines that the blade edge of the doctor blade 6 is overheated, the operator may operate the release switch 122. When the switch 122 is operated, the doctor blade 6 switches to the open state, and moves while being separated from the roll outer peripheral surface 10A. As a result, an overheat state can be avoided.
In addition, when the operator observes the attachment of foreign matter to a specific portion of the roll outer peripheral surface 10A, for example, the operation of the doctor device 1 is temporarily stopped. Next, switch group 1
Through 25, the coordinates of the moving range including the portion of the outer peripheral surface of the roll where many foreign substances are adhered are input. Thereafter, when the pressure switch 122 is operated and the slide start switch 123 is operated, the doctor blade 6 reciprocates within the designated moving range and performs doctoring of the outer peripheral surface of the roll.

On the other hand, when the automatic mode is set by the switch 126, for example, the following doctoring is executed. In this case, when there is no input of the movement range by the switch group 125, the doctor blade 6 is controlled to reciprocate in the maximum movement range defined by the sensors 131 and 132. Further, according to the timer count by the timer 101, the doctor blade 6 is temporarily switched to the open state at predetermined time intervals, and the blade of the doctor blade 6 is controlled so as not to be overheated. When the moving range is input by the switch group 125, the doctor blade 6 is reciprocated within the range.

Here, in the automatic mode, the following operation modes can be considered. First, if a temperature sensor for detecting the temperature state of the blade edge portion of the doctor blade 6 is installed, it is possible to reliably prevent the blade edge of the doctor blade 6 from overheating based on the sensor output. . That is, when the temperature of the blade edge exceeds a preset temperature by the sensor, the doctor blade 6 may be kept open for a predetermined time defined by the timer 101 to cool the blade edge of the doctor blade.

A sensor for detecting the degree of contamination of each part of the roll outer peripheral surface 10A, that is, a sensor for detecting the degree of adhesion of foreign matter, is provided, and the movement range of the doctor blade is determined based on the output of this sensor. Is automatically set, doctoring can be performed efficiently. More specifically, a sensor detects a portion where a large amount of foreign matter is attached (a portion where a large amount of dirt is present), and the sliding control circuit 100 calculates the moving range of the doctor blade including the portion based on the result. Then, the doctor blade 6 is reciprocated within this movement range to reliably scrape off foreign matter. With such control, foreign matters can always be reliably removed from the outer peripheral surface of the roll, and efficient doctoring can be realized.

On the other hand, a multi-stage doctor device can be formed by using the sliding doctor device having the above-described structure. That is, the sliding doctor device having the above-described configuration, disposed at a position upstream of the sliding doctor device in the roll rotation direction,
A configuration having a doctor device for performing doctoring of the outer peripheral surface of the roll using a doctor blade having a width substantially equal to the roll width can be adopted. According to this configuration, doctoring of the entire width of the roll is performed by a general doctor device on the upstream side, and the residue on the surface is removed. Next, using a sliding doctor device, the paper residue and the like that are partially adhered are removed. By performing doctoring in two stages in this manner, efficient doctoring can be realized.

[0047]

As described above, in the doctor apparatus of the present invention, the doctor blade on the outer peripheral surface of the roll is slid in the axial direction while the narrow doctor blade is pressed against the outer peripheral surface of the roll. It is configured as follows. Therefore, it is possible to easily adjust the pressing force of the doctor blade as compared with a doctor device having a configuration in which a doctor blade having the same width as the roll width conventionally used is used. In addition, a sufficient pressure contact force can be applied to the blade edge of the doctor blade. Furthermore, since it is possible to easily deal with rolls having different roll widths only by changing the moving range of the doctor blade, it is not necessary to use a doctor blade corresponding to the roll width.

Further, according to the present invention, since excessive heat generation of the doctor blade can be avoided, excessive wear of the doctor blade or the outer peripheral surface of the roll can be prevented.

Furthermore, the sliding range of the doctor blade can be changed. Therefore, for example, it is possible to doctor only a portion of the outer peripheral surface of the roll that is very dirty. For this reason, compared with the case where the outer peripheral surface of the roll is completely doctored, advantages such as the ability to remove foreign matters more efficiently are obtained.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram for explaining a length relationship of each part and a moving range of a doctor blade in the doctor device of FIG. 1;

FIG. 3 is a partially enlarged view showing a doctor blade and a blade holder in the doctor device of FIG. 1 in an enlarged manner.

FIG. 4 is a schematic block diagram showing a drive control system of the doctor device of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Doctor device 4 Linear slide mechanism 5 Blade holder 6 Doctor blade 10 Roll 10A Roll outer peripheral surface 10a Roll axis 100 Sliding control circuit 101 Timer 110 Pressing / opening control circuit 120 Manual operation panel 121 Pressing switch 122 Opening switch 123 Sliding Operation start switch 124 Sliding stop switch 125 Switch group for operating range input 126 Mode switch

Claims (13)

[Claims] 1. A doctor blade having a fixed width is pressed against the outer peripheral surface of a roll, and the doctor blade is moved in the axial direction along the outer peripheral surface of the roll, so that the doctor blade is moved at different positions in the axial direction. A sliding doctor device for removing foreign matter from the outer peripheral surface of the roll, comprising: a sliding switch for inputting an instruction to start and stop the sliding of the doctor blade; and a pressurizing device for pressing the doctor blade against the outer peripheral surface of the roll. Pressurizing / opening means for switching between a state and an open state separated from the outer peripheral surface of the roll, and a pressurizing / opening switch for inputting an instruction to switch the doctor blade between a pressurized state and an open state. And a sliding doctor device. 2. The sliding doctor device according to claim 1, wherein a sliding range of the doctor blade can be changed. 3. The slide control means according to claim 1, further comprising: a slide control means for controlling the slide of the doctor blade; and a heat state detecting means for detecting a heat state of the doctor blade. When the heating state detecting means detects that the doctor blade has reached a temperature higher than a predetermined temperature, the pressure / opening means is driven to switch the doctor blade to the open state. Features a sliding doctor device. 4. The sliding control means according to claim 3, wherein said sliding control means has a timer function, and drives said pressurizing / releasing means to drive said doctor blade for a fixed time every time a preset time elapses. A sliding doctor device characterized by switching to an open state. 5. The apparatus according to claim 3, further comprising: a dirt detection unit configured to detect a dirt state of the outer peripheral surface of the roll, wherein the sliding control unit determines a dirt condition based on a detection result of the dirt detection unit.
A sliding doctor device for defining a sliding range of the doctor blade. 6. A doctor blade having a fixed width is pressed against the outer peripheral surface of the roll, and the doctor blade is manually operated in the axial direction along the outer peripheral surface of the roll. A sliding doctor device for removing foreign matter from the outer peripheral surface of the roll, comprising: a sliding control unit configured to control sliding of the doctor blade; and a heating state detecting unit configured to detect a heating state of the doctor blade. Then, the sliding control means, when it is detected by the heat generation state detecting means that the doctor blade has reached a temperature higher than a predetermined temperature,
A sliding doctor device wherein the doctor blade is switched to an open state by driving the pressurizing / opening means. 7. The slide control means according to claim 6, wherein said slide control means has a timer function, and drives said pressurizing / opening means to drive said doctor blade for a predetermined time every time a preset time elapses. A sliding doctor device characterized by switching to an open state. 8. The apparatus according to claim 6, further comprising: a dirt detection unit configured to detect a dirt state of the outer peripheral surface of the roll, wherein the sliding control unit determines a dirt condition based on a detection result of the dirt detection unit.
A sliding doctor device for defining a sliding range of the doctor blade. 9. The sliding doctor device according to claim 1, wherein a width of the doctor blade is set to be equal to or less than a half of an axial length of a target roll. . 10. The sliding doctor device according to claim 9, wherein the doctor blade has a width in a range of about 50 mm to about 500 mm. 11. The sliding doctor device according to claim 10, wherein the doctor blade has a width of about 100 mm. 12. The sliding doctor device according to claim 1, wherein the doctor blade is movable at different speeds in the axial direction of the roll. 13. A sliding doctor device according to claim 1 or 6, and a doctor blade arranged at a position upstream of the sliding doctor device in the roll rotation direction and having a width substantially equal to the roll width. And a doctor device for performing doctoring of the outer peripheral surface of the roll by using a multi-stage doctor device.