JPH07157996A - Washing of suction roll of papermaking machine and washer therefor - Google Patents

Abstract

PURPOSE:To automatically wash a suction roll of a papermaking machine in a short time. CONSTITUTION:This washer is equipped with units 2 for rotatably supporting a suction roll 1 and a washing head 3 capable of moving in the axial direction while facing to the suction roll surface and plural spray nozzles for spraying rod-state washing liquid to the suction roll surface at different incident angles are attached to the washing head. Washing water of 2 to 8MPa is sprayed through the spray nozzles toward the suction roll surface while making the washing head perform a reciprocating motion. After performing the reciprocating motion%escribed times, the suction roll is rotated and shifted by a prescribed angle in the peripheral direction. The suction roll is washed again while moving the washing head and the suction roll is intermittently rotated to wash the suction holes in order. Foreign materials adhering to the inner wall of the suction hole are effectively removed by directly applying the washing water directly to the foreign materials.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper machine suction roll cleaning machine utilizing a jet pressure of high-pressure cleaning water for cleaning a suction roll mounted on a paper machine, and a paper machine suction roll cleaning method. . In the following description, the paper machine suction roll is simply referred to as a suction roll or roll.

[0002]

2. Description of the Related Art A suction roll for dewatering attached to a paper machine usually has a length of 1900 to 5000 mm, an outer diameter of 500 to 1200 mm, and a wall thickness of 40 to 50 mm with a thickness of about 25 mm on the outer surface. It is rubber lined. The rubber lining side has a diameter of 2.8 to 3.2 mm toward the central axis of the suction roll, and the steel pipe side has a diameter of 4.5 m.
Through holes of about m, that is, suction holes are formed at a pitch of 8 to 20 mm. In a paper mill or the like, while rotating the suction roll, the inside of the roll is depressurized, and water is sucked inward from the fiber layer covering the outside through the suction hole to dehydrate. Suction rolls gradually clog their suction holes during long-term use and their dewatering ability declines, so once a year,
It is necessary to clean this blockage at the appropriate time. Conventionally, the suction holes have been cleaned one by one with an electric drill to remove foreign matter that has become clogged. However, since the number of suction holes is very large, reaching from tens of thousands to sometimes hundreds of thousands, the work for removing the hole clogging requires a long time, for example, 10 days to clean one suction roll. It was a heavy labor task.

[0003]

It was not unthinkable to inject high-pressure water from the outside of the roll to remove the hole clogging in order to avoid the heavy labor of removing the hole clogging, but it was fixed on the inner wall of the hole. It was not possible to obtain a sufficient effect for removing the foreign matter. Further, Japanese Patent Publication No. 63-14120 proposes a roll cleaning device in which a guide rail is inserted inside a roll and a rotatable injection nozzle is moved along the guide rail. However, it requires a complicated mechanism to make the injection nozzle rotatable, and when the cleaning water is injected from the inside, it impacts the rubber layer overhanging the opening of the steel pipe body, and the rubber lining. Could be peeled off.

The present inventor has studied an efficient and simple cleaning device and cleaning method which can remove clogging of suction rolls reliably in a short time without requiring much labor, and as a result, the high pressure cleaning water was removed. We believed that it was our mission to develop a rational cleaning device and a suitable cleaning method, and continued our research to arrive at the present invention.

[0005]

SUMMARY OF THE INVENTION According to the present invention, there is provided roll supporting means for supporting a paper machine suction roll to be washed so as to be able to rotate discontinuously at a predetermined angle around a rotation axis, and a supported paper machine suction. A cleaning head capable of moving in the axial direction of the suction roll so as to face the roll surface is provided, and the cleaning head has a substantially rod-like jet flow at different incident angles with respect to the surface of the paper machine suction roll. To provide a paper machine suction roll washing machine characterized in that a plurality of jet nozzles for jetting in a state are provided. Here, it is desirable that the jet nozzle holes be formed so that the rod-shaped jet streams jetted from the plurality of jet nozzles provided in the cleaning head are parallel to each other. Further, while the cleaning head is moved in the axial direction of the suction roll, the cleaning water is sprayed onto the surface of the suction roll, and the suction roll is intermittently rotated to sequentially clean the suction holes of the suction roll. A cleaning method is provided.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the main features of the suction roll cleaning machine of the present invention using high-pressure cleaning water will be described in any order. First, a cleaning head having a plurality of spray nozzles is adopted in order to simultaneously and efficiently clean a wide range. Secondly, in order to prevent peeling of the rubber lining and simplify the structure, the cleaning liquid is basically sprayed from the surface side of the suction roll. Thirdly, in order to effectively remove the foreign matter clogged in the suction holes, a plurality of substantially rod-shaped jet water flows are jetted onto the roll surface at different incident angles. Fourthly, a cleaning head is provided movably in the axial direction facing the roll surface so that the suction holes can be sequentially cleaned in the axial direction of the roll. The movement means relative movement. Fifth, the roll is discontinuously supported so as to be rotatable by a predetermined angle so that the cleaning area can be sequentially moved in the circumferential direction of the roll.

A more detailed description will be given below with reference to the drawings showing a preferred embodiment of the suction roll cleaning machine of the present invention. FIG. 1 is a schematic cross-sectional view of a suction roll washer of the present invention, and FIG. 2 is a side schematic view showing a partial cross section of the roll washer of the present invention. 3A and 3B are explanatory views of cleaning according to the present invention, in which FIG. 3A is an explanatory view of an injection portion and FIG. 3B is an enlarged view of a part thereof. The illustrated roll 1 is a generally used suction roll for papermaking, and the inner layer 9 is made of steel and the outer layer 8 is made of rubber lining. The suction hole is formed by penetrating both layers, but the suction hole 7 in the inner layer is
The hole diameter of ′ is larger than the hole diameter of the suction hole 7 in the outer layer.

Now, the roll 1 to be washed has a cleaning position
In order to move sequentially in the circumferential direction, it is necessary to support so as to be able to rotate a predetermined angle discontinuously about the axis. In this example, it is easy to attach the roll 1 to the supporting means,
Four support rollers 2 including a drive roller are used. Other supporting means such as supporting the rotating shaft of the roll may be used. On the outside of the roll 1, a cleaning head 3 that faces the roll surface 6 and can move in the axial direction of the roll 1 is provided. The cleaning head 3 is provided with a plurality of spray nozzles 5 and can spray high-pressure cleaning water onto the roll surface 6. The relationship between the jet diameter D of the jet nozzle 5 and the distance L between the jet nozzle 5 and the roll surface 6 is L / D of 20 to 1.
It is preferable to set it in the range of 50. As the moving means 4 of the cleaning head 3, a known means such as a rail or a feed screw can be adopted. The position of the cleaning head 3 with respect to the roll 1 may be above, laterally, or in the middle of the roll 1, but it is not preferable to blow the cleaning water upward from below.

The cleaning head 3 is provided with a plurality of jet nozzles 5 so that a large area can be efficiently cleaned at the same time. Further, the suction roll cleaning machine of the present invention, as shown in FIG. 3, for example, sprays cleaning water from a plurality of spray nozzles 5 onto the roll surface 6 at different incident angles θ1, θ2, and θ3, so that the suction holes are cleaned. The inner wall surface of 7, 7'can be spray cleaned from different angles. Therefore, the water flow is
The cleaning power is greater when the water flow is converged and sprayed in a rod shape,
This is preferable because the insides of the absorption holes 7 and 7'can be effectively cleaned. Particularly, in the present invention, it is important to inject in a substantially rod-like jet flow state. That is, the cleaning liquid flow in the spray flow state cannot wash the papermaking material waste that is tightly clogged in the fine holes. The incident angle θ is an angle at which the cleaning water jet center line a intersects a line b perpendicular to the tangent surface of the roll surface 6, that is, a normal line. The appropriate range of the incident angle θ varies depending on the thickness of the suction roll and the condition of clogging, but it is generally 0 to 30 degrees, preferably 0 to 20 degrees. The incident angle θ can be taken not only in the XY directions on the drawing but also in the Z direction perpendicular to the drawing in addition to this. The incident angles θ do not have to be different for each of the spray nozzles. For example, in order to sufficiently perform cleaning, a part of a plurality of spray nozzles 5 are overlapped at the same position by the movement of the cleaning head 3 at the same incident angle. It can be arranged to be washed.

A preferred arrangement of the jet nozzle 5 is such that the jet nozzle holes are bored so that the rod-shaped jet streams to be jetted are parallel to each other. Further, toward the different positions in the circumferential direction of the roll surface 6, that is, when expressed in cylindrical coordinates, r (roll surface) is the same, but at least θ (not incident angle θ) of the cylindrical coordinates is different. The cleaning water is arranged so as to be sprayed in parallel toward the. When the cleaning water is sprayed in parallel to different positions in the circumferential direction, the incident angle of the cleaning water naturally becomes different as shown in FIG. Such a cleaning head 3 can be manufactured at low cost because the jet nozzles 5 may be provided in parallel.
The hole diameter of the injection nozzle 5 may be about 0.8 to 1.5 mm. When the purpose is to wash the suction roll attached to the paper machine, the jet nozzle 5 should be 6 to 15 m long.
It is advisable to arrange 6 to 15 lines or zigzag at m intervals. If the number of injection nozzles is too large, the capacity of the pressurizing pump for cleaning water becomes large, and if it is too small, the cleaning area becomes small, which is not economical either. Usually, the central portion of the row of the injection nozzles 5 is closest to the roll surface 6, and the cleaning head 3 is mounted so that both ends thereof are substantially symmetrical.

Further, even when cleaning the rolls 1 having different outer diameters, or when the layout of the suction holes 7 and the state of clogging differ depending on the location, effective cleaning is possible.
The cleaning head 3 can also be configured so that the mounting angle thereof can be changed. It may be possible to install a drainage tray that flows out the washing water in the roll in order to efficiently flow the washing water, but the structure and insertion method of the drainage tray are not easy, and the configuration becomes complicated compared to the effect. , Not realistic.

Next, the suction roll cleaning method of the present invention will be described with reference to typical embodiments. If the above-mentioned suction roll washer is used, the roll can be washed in a short time with a little labor. First, the roll 1 is set on the roll supporting means 2 so as to be rotatable in the circumferential direction. While moving the cleaning head 3 in the axial direction of the roll 1, pressurized cleaning water is sprayed from the plurality of spray nozzles 5 toward the roll surface 6 to move foreign matter adhering to the inside of the suction holes 7 and 7'to the cleaning water. Peel and remove with energy. Since the foreign substances blocking the suction holes 7 and 7'are fairly firmly attached, the injection pressure of the wash water is increased to 2 to 8 MPa, preferably 2 to 6 MPa. If it is less than 2 MPa, it is often difficult to remove foreign matter that is firmly attached, and if it is greater than 8 MPa, the roll 1 may be scratched. Further, as the cleaning liquid used in the present invention, appropriate pressurized water is usually used, but depending on the adhered substance, a suitable chemical may be added or a chemical liquid may be used. Depending on the blockage of the suction hole 8,
Generally, the amount of water sprayed is 5 to 10 liters / minute per one spray nozzle, and the moving speed of the cleaning head is 100 to 400 cm.
/ Min.

In this way, while continuing the cleaning, the cleaning head 3 is reciprocated from one end of the cleaning range to the other end at least once in one direction, usually 1 to 4 times. When the cleaning is completed, the roll 1 is normally rotated about 2/3 of the spray width so as not to cause a blank area for cleaning.
Further, while the cleaning head 3 is moved in the axial direction of the roll 1 in the same manner as described above, the cleaning water is sprayed toward the roll surface 6 and the above operation is repeated. That is, while the cleaning head 3 is reciprocatingly moved to clean the roll 1, the roll 1 is intermittently rotated in the circumferential direction to sequentially clean all the suction holes 7 and 7 '. In cleaning the suction roll of a paper machine, empirically, it takes 0.5 to 2 hours to rotate the roll once,
The cleaning is performed 5 to 8 times, and the total cleaning time is 5 to 12 hours, but the present invention is not limited to this.

On the other hand, it is not preferable to wash the roll 1 by reciprocating the washing head while constantly rotating the roll 1 in the circumferential direction. The present inventor has found that, when the cleaning head is reciprocally moved and the roll is rotated continuously at the same time to perform cleaning, the spraying region draws the same locus, which may cause a cleaning blank region. ing. It is possible to avoid the blank area by using a geometrical analysis method, but it is sophisticated and complicated. It has also been found that when the roll 1 is supported by the support roller 2, the position of the roll 1 gradually shifts unless the roller 2 is configured with high precision.

The roll washer of the present invention can be operated unattended and automatically, but if the rotation of the suction roll 1 or the movement of the washing head 3 is stopped, washing water is sprayed at the same position for a long time. Since the rubber lining 10 may be damaged, in such a case, it is safe to provide a means for automatically stopping the injection of washing water.

[0016]

Since the roll cleaning machine of the present invention sprays the rod-shaped cleaning liquid from the surface side of the suction roll toward the suction holes at different incident angles, it can remove foreign matter adhering to the inner wall of the suction holes.
Impacts can be directly applied from different angles to effectively remove foreign matter. Moreover, since the cleaning water is sprayed from the outside of the roll, the structure of the device is simplified, the rubber lining is not damaged, and the device cost is low. And there are few problems in maintenance and inspection. It is a simple device that is easy to automate and that can safely and safely remove blockages in the suction roll within a short time with a small amount of labor.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a roll washer of the present invention.

FIG. 2 is a schematic side view showing a partial cross section of the roll washer of the present invention.

FIG. 3 is an explanatory view of cleaning, (a) is an explanatory view of an injection portion, (b) is an enlarged view of a part thereof,

[Explanation of symbols]

1: Suction roll 2: Support roller 3: Cleaning head 4: Moving means 5: Jet nozzle 6: Roll surface
7, 7 ': Suction hole 8: Suction roll outer layer (rubber lining) 9: Suction roll inner layer (steel)

Claims (3)

[Claims] 1. A roll supporting means for discontinuously supporting a paper machine suction roll to be cleaned so as to rotate about a rotation axis at a predetermined angle, and a suction roll facing the surface of the supported paper machine suction roll. And a plurality of jets for jetting the washing liquid to the surface of the paper machine suction roll at different incident angles in a substantially rod-like jet flow state. A paper machine suction roll washer characterized by having nozzles. 2. An injection nozzle hole is formed so that rod-shaped jet streams jetted from a plurality of jet nozzles provided in a cleaning head are parallel to each other.
Paper machine suction roll washer described in. 3. A. Attach the paper machine suction roll rotatably to the roll support means. While moving the washing head in the axial direction of the paper machine suction roll, a plurality of jet nozzles jet pressurized washing water of 2 to 8 MPa toward the surface of the paper machine suction roll in a substantially rod-like jet flow state. At least once from one end of the wash area to the other,
After moving the cleaning head, d. Rotate the paper machine suction roll by a predetermined angle in the circumferential direction, Hereinafter, the method for cleaning a suction roll of a paper machine is characterized in that the suction holes of the suction roll of the paper machine are sequentially washed by repeating the operations of b, c and d.