JP4159786B2 - Doctor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a doctor device that presses a blade edge of a doctor blade against the surface of a rotating roll such as a paper machine press roll to scrape off foreign matters such as paper dust adhering to the surface of the roll. More particularly, the present invention relates to a doctor device having a spraying mechanism for spraying a fluid such as air or water onto a blade edge portion for the purpose of washing away foreign matter after being scraped off from the surface of the roll and the blade edge portion of the doctor blade.
[0002]
[Prior art]
As a doctor device for scraping off foreign matter adhering to the surface of a roll such as a paper machine press roll, there is a configuration in which the cutting edge of a rectangular doctor blade having a length corresponding to the roll width is pressed against the surface of the rotating roll. Are known. This type of doctor device has a blade holder that holds the original end portion of the doctor blade, and a doctor back that supports the blade holder. The doctor back has journals attached to both ends thereof. And is supported so as to be rotatable about a rotation axis parallel to the roll. By rotating the doctor back, the doctor blade can be swung to a closed position where the blade edge is pressed against the surface of the roll and an open position away from the surface of the roll.
[0003]
In addition, the doctor device sprays air or water or fluid such as water or chemicals onto the blade edge of the doctor blade in order to wash away foreign matter that has been scraped off the surface of the roll and accumulated in the blade edge of the doctor blade. It has a mechanism. The spray mechanism includes a shower pipe to which air or liquid is supplied and a plurality of shower nozzles attached along the longitudinal direction of the shower pipe, and the fluid supplied from the fluid supply source is flexible. It is supplied to the shower pipe through the tube, and then sprayed from each shower nozzle to the cutting edge portion of the doctor blade.
[0004]
Next, as a doctor device, a multistage doctor device having a configuration in which doctor devices are arranged in multiple stages along the surface of a roll in the rotation direction is known. If a multistage doctor device is used, there is an advantage that foreign matter adhering to the surface of the roll can be scraped off efficiently and reliably. Also in this case, in order to wash away the foreign matter accumulated in the blade tip portion of the doctor blade of each stage of the doctor device, a spraying mechanism is arranged for each stage.
[0005]
[Problems to be solved by the invention]
Here, a large number of rolls are arranged in a paper machine press part or the like, and a doctor device is attached to each roll to scrape off foreign matter. Therefore, it may be difficult to ensure the arrangement position of the doctor device. In such a case, it is often impossible to secure an arrangement space such as a shower pipe constituting the spraying mechanism. In particular, in the case of a multi-stage doctor apparatus, it is necessary to arrange a shower pipe or the like for each doctor apparatus, and therefore it may be extremely difficult to secure an arrangement space for each component constituting the spray mechanism.
[0006]
The subject of this invention is made | formed in view of this point, and is providing the doctor apparatus provided with the spraying mechanism which requires little installation space.
[0007]
Moreover, the subject of this invention is providing the doctor apparatus provided with the spraying mechanism with which maintenance and replacement | exchange work are easy.
[0008]
Furthermore, an object of the present invention is to propose a multistage doctor apparatus having a spraying mechanism that has a small installation space and that is easy to perform maintenance and the like.
[0009]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides 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 press roll, and a doctor whose tip is pressed against the surface of the roll. A blade, a blade holder that holds the original end of the doctor blade, a doctor back that supports the blade holder, and a spray for spraying a fluid such as air or water at least near the blade edge of the doctor blade The spraying mechanism is formed in the doctor back and extends in the longitudinal direction of the doctor back, and a shower pipe mounting recess, a shower pipe mounted in the recess, and the shower pipe And a pipe fixing member that is fixed to the doctor back in a detachable state. The shower pipe, along its longitudinal direction, is characterized in that first shower nozzle of a plurality of blowing fluid towards the cutting edge near the doctor blade is mounted.
[0010]
In the present invention, the shower pipe can be disposed within the doctor back installation space if the recess having a size sufficient to fit the shower pipe is formed. Further, since the shower pipe is detachably fixed to the concave portion by the pipe fixing member, it can be easily removed and attached during maintenance or replacement.
[0011]
Here, the shower pipe is provided with a plurality of second shower nozzles that blow out liquid in a direction different from the liquid blowing direction by the first shower nozzle along the longitudinal direction thereof. It can also be. If this configuration is adopted, chemicals and the like are sprayed on portions other than the blade edge portion of the doctor blade, for example, the roll surface portion before the foreign material is scraped off by the doctor blade and the roll surface portion after the scraping is performed. can do. Therefore, it is not necessary to arrange a plurality of shower pipes.
[0012]
Next, the present invention provides a multistage doctor device including at least first and second doctor devices arranged along the surface of a roll such as a paper machine roll in the rotation direction of the roll. The doctor device supports a first doctor blade whose blade edge is pressed against the surface of the roll, a first blade holder holding the first doctor blade, and the first blade holder. A first doctor back, and the second doctor device is located at a position downstream of the surface of the roll where the cutting edge of the first doctor blade is pressed against, in the rotational direction of the roll. comprises a second doctor blade edge is pressed against the surface portion of said roll, said first doctor device, Oyo edge portion of the first doctor blade Air the cutting edge portion of the second doctor blade has a blowing mechanism for blowing a fluid such as water, the spraying mechanism is formed on the first doctor back, the longitudinal direction of the doctor back And a shower pipe mounted in the recess, and a pipe fixing member that fixes the shower pipe to the first doctor back in a detachable state. The pipe has a first shower nozzle whose blowing direction faces the cutting edge portion of the first doctor blade and a blowing direction which faces the cutting edge portion of the second doctor blade along the longitudinal direction thereof. A second shower nozzle is attached.
[0013]
In the present invention, since the shower pipe is mounted in the recess formed in the doctor back, the shower pipe can be installed in the doctor back installation space. Further, since the shower pipe is attached in a detachable state by the pipe fixing member, maintenance work and replacement work are easy. In addition to this, since one shower pipe can be used to spray air, liquid, etc. on the blade tip of two doctor blades, the installation space is less than when multiple shower pipes are installed. Maintenance, replacement work, etc. are extremely easy.
[0014]
Here, it has the 3rd doctor device arranged in the position of the lower stream side of the rotation direction of the roll from the 2nd doctor device, and the 1st and 2nd doctor blades include the full width of the roll. It is length, The doctor blade of the said 3rd doctor apparatus can be set as the structure arrange | positioned only at the both ends of the width direction of the said roll. With this configuration, it is possible to prevent so-called swirling in the case of a roll crown.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a multistage doctor apparatus to which the present invention is applied will be described below with reference to the drawings.
[0016]
FIG. 1 is a side view showing the multistage doctor apparatus of this example. Referring to this figure, the multistage doctor device 1 of this example is for doctoring the surface of the paper machine roll 2 in the paper machine press part, and rotates along the surface of the roll 2. The first doctor device 10, the second doctor device 20, and the third doctor device 30 are arranged in this order toward the direction (the direction indicated by the arrow A).
[0017]
The basic configurations of these doctor devices 10, 20, and 30 are the same. The first doctor device 10 includes a doctor blade 11 in which the blade edge 11 a is pressed against the surface 2 a of the roll 2, and a base of the doctor blade 11. A blade holder 12 holding an end portion and a doctor back 13 supporting the blade holder 12 are provided. Similarly, the second doctor device 20 supports a doctor blade 21 in which a cutting edge 21 a is formed, a blade holder 22 that holds a portion on the former end side of the doctor blade 21, and the blade holder 22. The doctor back 23 is provided, and the third doctor device 30 also includes a doctor blade 31 in which a cutting edge 31a is formed, a blade holder 32 that holds a portion on the former end side of the doctor blade 31, and the blade holder. And a doctor back 33 supporting 32.
[0018]
The doctor blades 11, 21, and 31 of the doctor devices 10, 20, and 30 are arranged in parallel with the rotation axis of the roll 2 and have a length that covers the entire width of the roll surface 2a. However, as shown in FIG. 2, the doctor blade 31 of the third doctor device 30 may be arranged only at both end portions of the roll surface 2 a outside the both ends of the doctor blades 11 and 21. If it does in this way, as shown in a figure, it can prevent a whirling in the case of a roll crown.
[0019]
Further, journal shafts 14, 24, and 34 are respectively attached to both ends of the doctor backs 13, 23, and 33 of the doctor devices 10, 20, and 30, and these journal shafts 14, 24, and 34 are fixed on the fixed side. The journal bearings 15, 25, and 35 attached to the gantry 40 are supported so as to be rotatable about a rotation axis parallel to the roll rotation axis. The rotation of the doctor backs 13, 23, 33 due to such a structure is restricted by the fluid pressure cylinders 16, 26 and the turn buckle 36. By adjusting the fluid pressure cylinders 16 and 26 and the turnbuckle 36, the doctor blades 11, 21, and 31 of the doctor devices 10, 20, and 30 are separated from the roll surface 2 a and the closed position where the blade tips are pressed against the roll surface 2 a. It can be moved to the open position.
[0020]
Next, the multistage doctor apparatus 1 of this example is provided with a liquid spraying mechanism for washing away foreign substances accumulated on the cutting edge portion of the doctor blade 11 and the cutting edge portion of the doctor blade 21. Referring to FIGS. 3 and 4, the liquid spray mechanism 50 of the present example includes a single shower pipe 51 attached to the first doctor device 10 and a first pipe for mounting the shower pipe 51. The doctor apparatus 10 includes a recess 52 formed in the doctor back 13 and a plurality of fixing plates 53 for fixing the shower pipe 51 attached to the recess 52 to the doctor back 13. Further, although not shown, a flexible liquid supply tube connected to one end of the shower pipe 51 and a liquid supply source for supplying liquid to the shower pipe through the tube are provided. Yes.
[0021]
More specifically, the doctor back 13 is provided with a recess 52 for installing a shower pipe on the upper surface 13a thereof, that is, the surface facing the doctor blade 21 of the second doctor device 20. The depth of the recess 52 is substantially the same as the outer diameter of the shower pipe 51, and its width is a trapezoidal cross section that widens from the bottom of the recess toward the opening side. The upper surface 13a and the surface of the shower pipe 51 are almost at the same height.
[0022]
The fixing plate 53 includes an end fixing plate 53A for fixing both end portions of the shower pipe 51, and an intermediate fixing plate 53B for fixing the shower pipe 51 at regular intervals between them. By screwing these fixing plates 53 to the upper surface 13 a of the doctor back 13, the shower pipe 51 can be fixed to the recess 52 of the doctor back 13.
[0023]
Next, shower nozzles 54 are attached to the shower pipe 51 at regular intervals along the longitudinal direction thereof. The shower nozzle 54 of the present example includes a first shower nozzle 54A for blowing liquid toward the roll surface portion near the cutting edge 11a of the doctor blade 11 and a first shower nozzle 54 for blowing liquid toward the cutting edge portion of the doctor blade 21. 2 shower nozzles 54B, and these shower nozzles are alternately mounted. The shower nozzle 54A has a nozzle hole on its side surface, and the shower nozzle 54B has a nozzle hole on its tip surface.
[0024]
In the multistage doctor apparatus 1 of this example configured as described above, during the doctoring operation as shown in FIG. 1, the water or the chemical liquid supplied by the liquid spray mechanism is discharged from the nozzles 54 </ b> A and 54 </ b> B of the shower pipe 51. It is sprayed on the roll surface portion near the cutting edge of the blade 11 and the cutting edge portion of the doctor blade 21. Thereby, the foreign matter scraped off is washed away from the surface of the doctor blade.
[0025]
The shower pipe 51 of the liquid spray mechanism of this example is detachably attached to a recess 52 formed in the doctor back 13 of the first doctor device 10. Therefore, since the shower pipe 51 can be installed in the installation space of the doctor back 13, the shower pipe can be installed without increasing the installation space. The shower pipe 51 is fixed to the doctor back 13 in a detachable state by a fixing plate 54. Therefore, the work at the time of maintenance or replacement can be easily performed. Furthermore, since a shower nozzle 54 that blows out liquid in different directions is attached to the shower pipe 51, foreign matter can be washed out from the doctor blades of two doctor devices using one shower pipe. Can be configured compactly.
[0026]
(Other embodiments)
In the above example, the present invention is applied to a multi-stage doctor apparatus, but the present invention can be similarly applied to a single doctor apparatus.
[0027]
Moreover, although the above example is provided with a liquid spraying mechanism, it can be similarly configured when a spraying mechanism for spraying a gas such as air is provided.
[0028]
Furthermore, as the doctor device, various known doctor devices can be used as long as they perform a doctor ring while pressing the blade edge of the doctor blade against the rotating roll surface.
[0029]
【The invention's effect】
As described above, in the doctor device of the present invention, the concave portion for mounting the shower pipe, which is one of the components of the spray mechanism for spraying the fluid to the doctor back on or near the cutting edge of the doctor blade. The shower pipe is fixed in a detachable state here.
[0030]
Therefore, according to the present invention, the shower pipe of the spray mechanism can be disposed in the doctor back installation space, which is extremely effective when the installation location is restricted. Moreover, since the shower pipe is detachable, its maintenance work and replacement work can be easily performed.
[0031]
Further, since the shower nozzle that blows fluid in different directions is attached to the shower pipe, a fluid spraying mechanism for different locations can be realized by using a single shower pipe, so that the mechanism can be configured to be small and compact. .
[Brief description of the drawings]
FIG. 1 is a side configuration diagram showing a multistage doctor device to which the present invention is applied.
FIG. 2 is an explanatory diagram showing an example of the arrangement of doctor blades in each stage of the multi-stage doctor apparatus of FIG. 1;
FIG. 3 is a side configuration diagram showing the first doctor device of the multistage doctor device shown in FIG.
4A is an explanatory view showing an upper surface of a doctor back of the first doctor device of FIG. 3, and FIGS. 4B and 4C show a fixing plate for fixing a shower pipe, respectively. It is a top view.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Multistage doctor apparatus 2 Roll 2a Roll surface 10 1st doctor apparatus 20 2nd doctor apparatus 30 3rd doctor apparatus 11, 21, 31 Doctor blade 11a, 12a, 13a Blade edge 12, 22, 32 Blade holder 13, 23, 33 Doctor back 50 Liquid spray mechanism 51 Shower pipe 52 Recess 53, 53A, 53B Fixed plate 54, 54A, 54B Shower nozzle

Claims (4)

In a doctor device used to scrape foreign matter such as paper dust attached to the surface of a roll such as a paper machine press roll,
A doctor blade whose tip is pressed against the surface of the roll, a blade holder holding the original end portion of the doctor blade, a doctor back supporting the blade holder, and at least air in the vicinity of the blade edge of the doctor blade And a spraying mechanism for spraying fluid such as water,
The spray mechanism is formed in the doctor back and extends in the longitudinal direction of the doctor back, a recess for attaching a shower pipe, a shower pipe attached to the recess, and the doctor back in a state where the shower pipe is detachable. And a pipe fixing member fixed to the
A doctor device , wherein a plurality of first shower nozzles for blowing fluid toward the vicinity of the cutting edge of the doctor blade are attached to the shower pipe along the longitudinal direction thereof. In claim 1,
A plurality of second shower nozzles for blowing out fluid in a direction different from the blowing direction by the first shower nozzle are attached to the shower pipe along the longitudinal direction thereof. Doctor device. In a multistage doctor device comprising at least first and second doctor devices arranged in the rotation direction of the roll along the surface of the roll such as a paper machine roll,
The first doctor device includes a first doctor blade whose blade edge is pressed against the surface of the roll, a first blade holder holding the first doctor blade, and the first blade holder. A supporting first doctor back;
In the second doctor device, the cutting edge is pressed against the surface portion of the roll at a position downstream of the surface portion of the roll where the cutting edge of the first doctor blade is pressed against in the rotation direction of the roll. With a second doctor blade,
It said first doctor device has air, a blowing mechanism for blowing a fluid such as water to the cutting edge near the first doctor blade edge and near the second doctor blade,
The spraying mechanism is formed in the first doctor back and extends in the longitudinal direction of the doctor back, and a shower pipe mounting recess, a shower pipe mounted in the recess, and the shower pipe being detachable A pipe fixing member fixed to the first doctor back,
The shower pipe has a first shower nozzle in which a blowing direction is directed to a cutting edge portion of the first doctor blade along a longitudinal direction thereof, and a blowing direction is directed to a cutting edge portion of the second doctor blade. A multi-stage doctor device, wherein a second shower nozzle is attached. In claim 3,
Having a third doctor device arranged at a position downstream of the second doctor device in the rotational direction of the roll;
The first and second doctor blades have a length that encompasses the full width of the roll;
The third doctor device includes a doctor blade disposed only at both end portions in the width direction of the roll.

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