JPH0748794A - Washing of canvas of papermaking machine and apparatus therefor - Google Patents

Abstract

PURPOSE:To provide a method for washing an endless canvas of a papermaking machine, capable of washing in a short time without requiring detachment of the canvas from a drying unit of the papermaking machine and to provide an apparatus for carrying out this method. CONSTITUTION:This drying unit of a papermaking machine having a tightly closed hood 5 is equipped with a sliding pipe 6A of a washer parallel to the paper-contacting surface of an endless canvas 3 set at the upper and lower parts of a dryer 2. Plural spray nozzle holes 7 made on the sliding pipe are designed so that water may be sprayed toward the endless belt surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for cleaning a canvas of a paper machine, and more particularly, to a method for cleaning pitch and other adhered dirt adhered to a paper-contacting surface of the canvas without removing the canvas from the dryer of the paper machine. It relates to a method that can be washed in time and a device for carrying out the method.

[0002]

2. Description of the Related Art Conventionally, in a dryer unit of an automatic paper machine such as a reticulated type, a plurality of heater drums are arranged above and below, respectively. The canvas is placed on the upper and lower parts of the heater drum to press the paper against the heater drum. Therefore, the surface of the endless canvas that comes into contact with the paper has the pitch or the like contained in or attached to the paper, and if it is left inside as it is, it will stain the following paper for a certain period of time. Eg 3
Every month), the operation of the paper machine is stopped, the endless canvas is removed, and the machine is washed at a high water pressure of about 100 kg.

[0003]

In the conventional method for cleaning an endless canvas described above, since the endless canvas is detached and transported to another place for cleaning, a great deal of labor and time are required for detaching the endless canvas. There was a difficulty that the machine could not be operated. Therefore, there is no choice but to take a measure to wash the endless canvas when the paper machine is regularly stopped. Therefore, since the washing is performed every three months for a long period of time, a large amount of pitch and the like adheres to the canvas. Sisters,
There is a drawback that a sufficient cleaning effect cannot be obtained even if cleaning is performed by applying high water pressure. The present invention has been developed for the purpose of solving the above-mentioned problems, and providing a cleaning method capable of completely cleaning an endless canvas in a short time without removing it from an apparatus, and a mounting for carrying out the method. It was done.

[0004]

The present invention takes the following technical means in order to solve the above problems.

(A) Having a dryer in the closed hood,
In a paper machine in which an endless canvas is arranged above and below the dryer, a sliding pipe of a cleaning device is arranged in parallel with a support roll of the canvas, and the endless canvas is rotated while keeping the inside of a closed hood warm, Cold water is sprayed onto the plane of the canvas from a plurality of nozzles provided on the moving pipe to wash the surface of the canvas.

In the above case, the cleaning water sprayed from the fountain nozzle may be sprayed from one nozzle at a right angle, or one nozzle having several fountain holes may be used. May be. Further, the fountain may be jetted onto the plane of the canvas in an inclined form of 5 to 85 degrees, but the range of 25 to 65 is preferable. Further, it is effective to use a nozzle in which two or four nozzles are jetted symmetrically with respect to one nozzle. That is, the water is sprayed from one nozzle inclining in the longitudinal direction of the canvas surface, and in the case of four holes, it is further symmetrically inclined in the width direction of the canvas.

(B) As a device, a dryer for paper is provided in a closed hood, and an endless canvas for pressing the paper against the dryer is provided above and below the dryer. A sliding pipe of a cleaning device is arranged parallel to the support roll of the canvas, and a plurality of fountain nozzles are arranged in parallel on the sliding pipe toward the endless canvas surface. Is provided
A dryer for a paper machine was constructed in which a ventilation exhaust pipe was connected to the heat insulating hood.

In this case, the nozzles arranged side by side on the sliding pipe may be provided with one or a plurality of nozzles at right angles to the sliding pipe or at a slight inclination. The fountain holes of the nozzle may also be straight in the axial direction of the nozzle, a plurality of them may be inclined in one direction, or may be symmetrically inclined.
The sliding pipe continues to advance and retract in the longitudinal direction by a predetermined distance.

[0009]

In the present invention constructed as described above, it operates as follows.

First, the operation of the paper machine is stopped, and the dryer and the endless canvas are rotated. In this case, the temperature inside the closed hood usually reaches around 80 ° C in the lower part and around 120 ° C in the upper part, but drops to around 60 ° C. Therefore, by operating the washing device and sliding the sliding pipe, spraying cold water from the nozzle toward the rotating canvas surface, pitch and sticky contaminants that are sticky at high temperature are hardened by the cold water. And washed with water pressure. In this case, the fountain is 30 degrees to 60 degrees more than hitting the canvas surface at right angles.
The cleaning effect is improved by hitting it at an inclination angle of about 2 degrees.
By using a hole nozzle, etc.
Double the effect. Water pressure is about 20 kg and cleaning time is 3
Within 0 minutes is sufficient.

In the apparatus, the heat insulating hood is provided on the motor portion to prevent the motor from burning due to high temperature and losing durability. By blowing outside air into the heat shield hood from the outside, the motor has a heat shield effect.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a paper machine dryer 1 used in the method of the present invention.
Figure 3 shows a schematic side view of a part. This omits the paper machine part of the paper machine that has a completely closed hood system.
The drums 2A, 2A ... 2B ... of the dryer 2 are upper drums 2.
A ... Lower drum 2B ... are arranged side by side with their axes horizontal and parallel. As shown in the figure, endless canvases 3.3 ... are provided on the upper and lower parts of the upper and lower drums 2A.
Are supported by support rolls 4.4 ..., 4A ..., 4B. Of these support rolls, reference numerals 4A ... Are for pressing the upper canvas 2 onto the upper drums 2A. The paper H is arranged in parallel between the drums 2A. Reference numeral 4B ... is for pressing the paper H onto the lower drum 2B ... with the lower canvas, and reference numeral 4C ... is a tension adjusting roll for the canvas 3. In the case where a completely enclosed hood 5 is arranged above the dryer 2, a paper machine (not shown) is provided on the left side of the drawing, and a closed hood 5 of the same state is provided continuously on the right side. In some cases, a paper winding device is provided.

In the above-mentioned structure, the endless canvas 3 is located at a position facing the surface of the endless canvas 3.3, which is in contact with the paper H, and close to the position immediately after contacting the paper H. The sliding pipe 6A of the cleaning device 6 is arranged parallel to the support rolls 4.4 ...
, A plurality of fountain nozzles 7.7 are arranged at predetermined intervals (for example, every 15 cm), and their fountain holes 7A are arranged toward the surface of the endless canvas 3 which is in contact with the paper. Reference numeral 6B in FIG. 1 is a water pan.

FIG. 2 is a side view showing the relationship between the endless canvas 3 and the sliding device 6, and FIG. 3 is a perspective view of FIG. FIG. 4 is a cross-sectional view of one type of fountain nozzle 7. The sliding device 6 will be described with reference to FIGS. 2 to 4. Sliding device 6
Is a general public relation, and the sliding pipe 6A is arranged on the pair of support wheels 6C, 6C, and one end (right side in FIG. 2)
The motor 8 is disposed on the side of the motor 8, and the connecting member 9 connects the motor 8 and the sliding pipe 6A. FIG. 5 is a plan view of the motor 8 portion. That is, the sliding pipe 6A connected by the drive of the motor 8 via the connecting member 9.
Moves forwards and backwards at a predetermined interval. The motor 8 is covered with a heat insulating hood 10, and the heat insulating hood 10 has a blower pipe 1
0A and the exhaust pipe 10B are arranged, and the cool air is blown into the heat insulating hood 10 from the blower (not shown) through the blower pipe 10A, so that the motor 8 can be burned by the high heat in the hood 5 of the drying device. Absent. In FIG. 2, the fountain nozzles 7 ... Are arranged so that their directions are orthogonal to the surfaces of the sliding pipe 6A and the canvas 3, but as shown in FIG. When the fountain nozzle having the two holes 7A and 7A is used, the fountain hits the canvas 3 while being inclined with respect to the longitudinal direction of the canvas 3, so that the cleaning efficiency is high. Further, as shown in FIG. 3, inclining the fountain nozzle 7 in the longitudinal direction of the canvas 3 surface (about 52 degrees) has a greater cleaning effect than inclining it at a right angle. As the fountain nozzle 7, nozzles of registered design No. 750794, similar designs 1 to 8, No. 761968, and similar designs are used. For the cleaning device 6, for example, Japanese Patent Publication No. 35434, No. 35434 is preferably used.

In the present invention constructed as described above, the dryer part of the paper machine has the complete closed hood 5, and even if the operation of the paper machine is temporarily stopped.
The inside is hot. However, by operating the cleaning device 6 while rotating the dryer 2 and the endless canvas 3, the endless canvas 3 can be completely cleaned in a short time of about 30 minutes. Therefore, it is possible to save the labor and labor of removing the endless canvas 3 ..., cleaning it at another place, and newly mounting the endless canvas. Also, the inside of the hood 5 of the drying device is normally at 80 ° C at the bottom.
Since the temperature is higher than the above, the durability of the motor becomes a problem due to heat. However, by blowing cool air into the hood 10 of the motor through the blower exhaust pipes 10A and 10B, the motor can be protected from high heat. Normally, the cleaning device 6 can be left as it is. From this, when the paper machine is stopped for adjusting the paper machine for each short period, the cleaning machine may be operated while rotating the heater drums 2A, ... Can be washed, and the washing time can be completed in about 30 minutes. Moreover, a water pressure of about 20 kg is sufficient.

Although the sliding device 6 is located below the endless canvas 3 in FIG. 1, it should be understood that the sliding device 6 may be located above the endless canvas 3 so that the fountain nozzle 7 faces downward. is there. In that case, the fountain nozzle 7
6B below the end of the endless canvas 3
Or a water absorbing device.

[0017]

The present invention constructed as described above has the following excellent effects.

A. Since the fountain nozzle of the cleaning device is arranged so as to face the paper-contacting surface of the endless canvas, and the cleaning can be performed by sliding the sliding pipe, there is an effect that the endless canvas can be completely cleaned without being removed.

B. This is a cleaning device that is always installed in a drying device that has a completely sealed hood.However, a heat insulating hood is provided on the motor part to prevent deterioration of durability due to high heat, resulting in improved durability. , Paper machine 1
It is possible to wash the endless canvas when it is stopped for a short time, and it is possible to wash the canvas every short period, so that the stains on the canvas are washed in a short period of time, and there is an effect that the quality of the paper can be improved.

C. Since the endless canvas can be washed while the stain is small, the time and water pressure required for washing can be small and the maintenance cost is low. In addition, the durability of the endless canvas is improved, and there is an effect that labor for attaching and detaching for cleaning and labor can be saved.

[Brief description of drawings]

FIG. 1 is a schematic side view of a dryer of a paper machine.

FIG. 2 is a front view showing a relationship between an endless canvas and a cleaning device.

FIG. 3 is a right side view of FIG.

FIG. 4 is a cross-sectional view of one type of fountain nozzle.

FIG. 5 is a partial plan view of a motor of the cleaning device.

[Explanation of symbols]

 1. Dryer of paper machine 2. Dryer 2A, 2B Heater drum 3. Endless canvas 4.4A, 4B, 4C, support roll 5. Closed hood 6. Cleaning device 6A Sliding pipe 6B Water receiver 6C Support wheel 7. Fountain nozzle 7A Fountain hole 8. Motor 9. Connecting member 10. Heat-proof hood 10A Blower pipe 10B Exhaust pipe

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[Procedure amendment]

[Submission date] August 4, 1994

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Figure 2]

[Figure 3]

[Figure 4]

[Figure 5]

Claims (4)

[Claims] 1. A paper machine having a dryer in a closed hood, and an endless canvas for pressing paper on the upper and lower parts of the dryer, wherein sliding pipes of a cleaning device are arranged in parallel with a support roll of the canvas. While rotating the endless canvas while keeping the closed hood warm, while spraying water onto the plane of the canvas from a plurality of fountain nozzles provided on the sliding pipe, the surface of the paper machine is washed. How to wash the canvas. 2. A method for cleaning a canvas of a paper machine according to claim 1, wherein cold water is inclined and jetted from a fountain nozzle with respect to a canvas surface. 3. The method of cleaning a canvas according to claim 2, wherein the cold water jet from the fountain nozzle onto the surface of the canvas is jetted while being inclined in both the longitudinal direction and the width direction of the canvas. 4. A dryer for a paper machine, comprising a dryer for paper in a closed hood, and an endless canvas that presses the paper against the dryer, wherein the cleaning device slides parallel to the support rolls of each endless canvas. A moving pipe is arranged, a plurality of fountain nozzles are arranged in parallel on the sliding pipe in the direction of the endless canvas surface, a heatproof hood is provided on the motor part of the cleaning device, and a blower exhaust pipe is provided on the heatproof hood. A dryer for a paper machine, which is characterized in that: