JP3330454B2 - Doctor device with centering function - Google Patents

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 off paper residue adhered to the surface of a paper machine roll, foreign matter adhered to the surface of a roll, and the like. More specifically, the present invention relates to a doctor device having a function capable of easily performing a centering operation on a roll.

[0002]

2. Description of the Related Art Conventionally, a doctor device has been used to scrape off foreign substances adhering to the surface of a roll. FIG.
1 shows a schematic configuration of a general doctor device. As shown in this figure, a doctor device 1 has an elongated doctor blade 2 of a fixed width pressed against the outer peripheral surface of a roll R.
And a support portion 3 for supporting the support portion. The support portion 3 is supported on the side of the device base 5 via support shafts 4 attached to both ends of the support portion. The support shaft 4 is rotatably attached to a bracket 6 on the base 5 side via a metal bearing (not shown). Further, the support portion 3 is provided at both ends thereof with a base 5 via a turnbuckle 7.
The supporting portion 3 supporting the doctor blade 2 by adjusting the turnbuckle 7
Can rotate about the support shaft 4, so that the doctor blade 2 can be pressed against the outer peripheral surface of the roll R with an appropriate blade contact angle.

When the roll R is rotated in a state where the doctor blade 2 is pressed against the outer peripheral surface of the roll R, foreign matter adhering to the outer peripheral surface of the roll is caused by the blade edge 2a of the doctor blade 2 pressed against the outer peripheral surface. Is scraped off. When such a scraping operation (doctor ring) is performed for a long time, the outer peripheral surface of the roll is worn and its outer diameter is reduced (a state shown by an imaginary line in the figure). In a remarkable case, the amount of abrasion of the roll may reach about 100 mm. When the outer peripheral surface of the roll is worn, the doctor blade 2
Since the cutting edge 2a of the roller does not come into contact with the outer peripheral surface of the roll with an appropriate pressing force, it is necessary to move the support portion 3 as a whole toward the roll R and adjust it so as to bring the blade into a proper blade contact state.

For this reason, in the conventional doctor device, as shown in FIG. 1, each bracket 6 on the side of the base 5 supporting the support shafts 4 at both ends of the support portion 3 is inserted through an elongated hole 8. The base is fixed to the fixed side member 5a of the base 5 with the fastening bolts 8a, and when adjustment is necessary, the fastening bolts are loosened and the adjuster bolts 9 are used to fix the brackets 6 at both ends.
Is moved to the roll side. In such an adjustment, it is necessary to perform centering again. That is, it is necessary to use a gauge or the like to adjust the blade edge 2a of the doctor blade 2 so that the blade edge 2a is appropriately in contact with the outer peripheral surface of the roll at any position in the longitudinal direction.

[0005]

However, such centering work requires skill and is time-consuming. Therefore, in particular, when the doctor device is installed on a roll or the like that is heavily worn, the centering work associated with the adjustment of the support section 3 needs to be performed frequently, which is troublesome.

Further, in the related art, since the supporting portion of the doctor device is movably supported by using the long hole, the moving range is extremely limited. For this reason,
In the case of a roll with a large amount of wear, it may not be possible to adjust to follow the wear, and in this case, it is necessary to change the installation position of the base of the doctor device, which is inconvenient. is there.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to propose a doctor device capable of easily performing a centering operation in adjusting a position of the doctor device due to abrasion of a roll or the like.

[0008]

In order to solve the above-mentioned problems, a doctor device according to the present invention comprises a support for supporting a doctor blade, which is pressed against the outer peripheral surface of a roll, attached to both ends thereof. While supporting on the device base side via a shaft, the supporting portion is movably fixed to the device base, and each support shaft is connected to the outer surface of the roll against which the doctor blade is pressed. By adopting a configuration in which a stop member capable of abutting on the outer peripheral surface of the roll is attached at a position at a fixed distance, the support portion is moved until these stop members abut on the outer peripheral surface of the roll, so that the center of the roll is adjusted. I'm trying to put out.

In the present invention, the tip of each support shaft is slidably inserted into a groove formed on the side of the device base, and can be fixed at a predetermined position in the groove by a fixing tool. In each spindle, at the position where the center of the spindle is a fixed distance from the outer surface of the roll against which the doctor blade is pressed, a stopping member for stopping the sliding of the spindle is provided. By adopting the attached structure, the centering of the roll is performed by sliding each support shaft in the corresponding groove until the stop member comes into contact with the outer peripheral surface of the roll.

Here, it is preferable that the stopping member is an annular member rotatably attached to the support shaft.

[0011]

When the surface of the roll is worn and it becomes necessary to move the doctor blade toward the roll, the support is moved with respect to the apparatus base. When the supporting portion is moved to the roll side, the stopping members attached to the spindles at both ends of the supporting portion hit the outer peripheral surface of the roll, and further movement is impossible. If the support is fixed to the device base at this position, the doctor device can be automatically centered.

When a rotatable annular member is used as the stopping member, doctor ring can be performed while the stopping member is in contact with the outer peripheral surface of the roll. That is, the stopping member in contact with the roll rotates in the opposite direction with the rotation of the roll, and does not hinder any operation. In addition, when such a rotatable configuration is not adopted as the stopping member, after centering,
The stopping member may be retracted from the outer peripheral surface of the roll.

[0013]

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

FIGS. 1 and 2 show the configuration of a doctor device to which the present invention is applied. With reference to these drawings, the doctor device 10 of the present embodiment has a doctor blade 11 and a support portion 12 that supports the doctor blade 11, and both end surfaces 12R and 12L of the support portion 12 have a longitudinal direction. The support shafts 13R and 13L are fixed at right angles toward. On the outer periphery of these support shafts, annular stoppers (restriction members) 15R, 1R are provided via ball bearings 14R, 14L, respectively.
5L is rotatably mounted. The distal ends of the spindles protruding from these stoppers are cut off on both sides in the diameter direction to form groove sliding portions 16R and 16L having a constant thickness. On the side surfaces of the brackets 18R, 18L on the side of the device base 17 for supporting these support shafts 13R, 13L, there are provided angular grooves 19R, 19L in which the above-mentioned groove sliding portions 16R, 16L can slide, respectively. Is formed. A plurality of bolt holes extending from the upper surfaces of the brackets 18R and 18L to the square grooves are formed, and fastening bolts 21 are mounted here. With these fastening bolts 21, the groove sliding portions 16R and 16L of the support shaft are formed into the square grooves 1
9R and 19L can be fixed at predetermined positions.

FIG. 2 shows the support 12 of the doctor device 10.
2 shows the structure of the holding portion of the doctor blade 11 in FIG. The structure of this part is generally known, and the base end of the doctor blade 11 is sandwiched between a top plate 122 and a finger member 123 attached at equal intervals to the back surface. The rotation center shaft 125 is interposed between the finger member 123 and the lower support plate 124, and a pair of air tubes 126, 127
Is installed. These air tubes 126, 1
By expanding and contracting 27, the rotation center axis 125
The doctor blade 121 can be turned around the center. Thereby, the doctor blade 11 can be brought into a pressurized state in which the doctor blade 11 is pressed against the roll 30 and an open state in which the doctor blade 11 is separated therefrom. Further, the pressing force of the cutting edge 11a against the outer peripheral surface of the roll can be adjusted.

FIG. 3 shows a state in which the doctor device 10 of this embodiment is installed on a roll R. Here, the directions of the square grooves 19R and 19L formed in the brackets 18R and 18L are set to be in a state of facing the center O1 of the roll 30. The stoppers 15R and 15L have the same outer diameter, and are set to dimensions such that the blade edge 12a of the doctor blade 121 is brought into an appropriate blade contact state.

The thus configured doctor device 1 of the present embodiment.
In mounting the mounting portion 0, the groove sliding portions 16R, 1R formed at the distal ends of the support shafts 13R, 13L at both ends of the support portion 12 are provided.
The 6L is inserted into the square grooves 19R and 19L formed on the brackets 18R and 18L, and moved toward the target roll R. An annular stopper 15R, 1
Since the stoppers 5L are respectively mounted, these stoppers move to a state where they come into contact with the outer peripheral surface 30a of the roll 30, and in this state, if the support shafts 13R and 13L are fixed with the bolts 21, the centered state is obtained. It is formed. That is, at both ends of the support portion 12, the distance L from the support shaft center O2, which is the center of rotation, to the surface 30a of the roll 30 is set by the stoppers 15R and 15L so as to be the same. If the shaft is fixed, the doctor blade 11 supported at the tip of the support 12
Is set on the roll 30 in a state where the centering is performed.

When the doctor device 10 is in operation, the outer peripheral surfaces of the stoppers 15R and 15L are rotated by the outer peripheral surface 30 of the rotating roll.
a. However, each stopper 15R, 15L
Is supported by the support shaft via a ball bearing, so that each stopper also rotates and does not adversely affect the rotation of the doctor ring or the roll.

Next, by long term doctoring,
As shown in FIG. 4, the roll 30 may be worn, and the outer peripheral surface 30 a may retreat to a position indicated by 30 b and move away from the cutting edge 11 a of the doctor blade 11. In this case, if the support portion 12 is turned around the support shaft center O2 to bring the blade edge 11a into contact with the roll outer peripheral surface 30b, the blade contact angle θ (see FIG. 3) changes, which is not preferable. In this example, the bolts 21 are loosened, and the support shafts 13R and 13L at both ends of the support portion 12 are attached to the brackets 18.
The inside of the square grooves 19R, 19L of the R, 18L is made slidable, and the support 12 is moved toward the roll 30 in this state. This movement is performed until the stoppers 15R and 15L hit the roll outer peripheral surface 30b. After each stopper hits the roll outer peripheral surface 30b, the support portion 12 is fixed again.
As a result, at both ends of the support portion 12, the distance from the center O2 of the support shaft to the outer peripheral surface 30b of the roll is the initially set L.
Is set to be equal to That is, centering of the doctor blade 11 with respect to the roll 30 is automatically performed.

As described above, in the doctor device of the present embodiment, the support portion 12 is provided with the square grooves 19R, 19R on the base side.
L, the support shafts 13R, 13L at both ends of the support portion are rotatably supported by annular stoppers 15
R and 15L are used. Therefore, when the outer peripheral surface of the roll 30 is worn, the support portion 1
If the stopper 2 is moved until the stoppers 15R and 15L come into contact with the outer peripheral surface of the roll 30 and fixed at that position, the centering can be automatically performed. Therefore, the centering operation, which has been performed by a skilled worker using a gauge or the like as in the related art, can be performed automatically and in a short time.

In the above embodiment, the support shafts at both ends of the support portion are moved along the square grooves formed on the side of the device base. Instead, the present invention can be applied to a doctor device having a conventional configuration as described with reference to FIG. That is, referring to FIG. 5, a stopper similar to the above embodiment is attached to the support shafts 4 at both ends, and the support portion 3 is moved by the adjuster bolt 9 until the stopper hits the outer peripheral surface of the roll. With such a configuration, centering can be automatically performed as in the above-described embodiment.

Further, in the above-described embodiment, a stopper having a structure rotatably supported on a support shaft via a ball bearing is employed as a stopper. Instead, it is also possible to use a stopper which is not rotatable. In this case, when moving the support portion of the doctor device, the stopper is moved to a position where it can contact the outer peripheral surface of the roll, and in other states, the stopper can be moved to a position where it does not contact the outer peripheral surface of the roll. The stopper may be configured.

[0023]

As described above, in the doctor device of the present invention, the support portion of the doctor device is movably mounted on the device base, and the stopping members are attached to the support shafts at both ends of the support portion. By mounting, the support portion can be moved to a position where the distance from the center of the support shaft to the outer peripheral surface of the roll is always constant. Therefore, according to the present invention, when the support portion of the doctor device is moved, for example, when the outer peripheral surface of the roll is worn, centering is automatically performed by fixing the support portion at the position restrained by the restraint member. be able to.

Further, in the present invention, since the annular member rotatably supported on the support shaft is employed as the stop member, the doctor ring can be removed while the stop member is in contact with the outer peripheral surface of the roll. It can be carried out. Therefore,
After the centering, the operation of retracting the stopping member to a position where it does not contact the roll is not required, which is convenient.

Further, in the present invention, a configuration is employed in which the support shafts at both ends of the support portion of the doctor device are slidably supported in a groove formed on the side of the device base. Therefore, the range of movement of the support portion of the doctor device is not limited to a small range as in the related art, and the support portion can be moved by following the wear of the roll, etc. Doctoring can be performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a main configuration of a doctor device to which the present invention is applied.

FIG. 2 is a partial cross-sectional view showing a cross-sectional configuration of a holding portion of a doctor blade of the doctor device of FIG.

FIG. 3 is a schematic configuration diagram showing a state where the doctor device of FIG. 1 is installed on a roll.

FIG. 4 is an explanatory view showing a centering operation of the doctor device of FIG. 1;

FIG. 5 is a configuration diagram showing a schematic configuration of a conventional doctor device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Doctor device 11 ... Doctor blade 12 ... Support part 13R, 13L ... Support shaft 14R, 14L ... Ball bearing 15R, 15L ... Stopper (stop member) 16R, 16L ...・ Groove sliding portion 17R, 17L ・ ・ ・ Device base 18R, 18L ・ ・ ・ Bracket 19R, 19L ・ ・ ・ Square groove 30 ・ ・ ・ Roll 30a, 30b ・ ・ ・ Roll outer peripheral surface

Claims (4)

(57) [Claims] 1. A supporting portion for supporting a doctor blade pressed against the outer peripheral surface of a roll is supported on a base side through support shafts attached to both ends thereof, and is supported by the base. The center of the support shaft abuts against the outer peripheral surface of the roll at a position at a fixed distance from the outer surface of the roll against which the doctor blade is pressed. A doctor device with a centering function, wherein a possible stopping member is attached, and centering of the roll is performed by moving the supporting portion until the stopping member comes into contact with the outer peripheral surface of the roll. 2. The doctor device with a centering function according to claim 1, wherein the stopping member is an annular member rotatably attached to the support shaft. 3. A supporting portion for supporting a doctor blade pressed against the outer peripheral surface of the roll is supported on a base side through supporting shafts attached to both ends thereof, and a tip of the supporting shaft. The part is slidably inserted into a groove formed on the side of the base, and can be fixed at a predetermined position in the groove, and the support shaft has a center of the support shaft. At a position at a fixed distance from the outer surface of the roll to which the doctor blade is pressed, a stopping member for stopping the sliding of the spindle is attached, and the spindle is placed in the groove. A doctor device with a centering function, wherein centering of the roll is performed by sliding the stopping member until it comes into contact with the outer peripheral surface of the roll. 4. The doctor device with a centering function according to claim 3, wherein the stopping member is an annular member rotatably attached to the support shaft.