JPH0715799U - External cleaning device for dandy rolls - Google Patents

Abstract

(57) [Summary] [Purpose] As an external cleaning device for dandy rolls that are placed in the wire part of the papermaking process, the cleaning device itself has a sufficient cleaning capacity, and the cleaning device itself is always kept clean. Provided is one that is structurally simple and easy to manufacture and install without adversely affecting paper quality. A roll surface 1a of the dandy roll 1 is attached to a moving member 11 that reciprocates parallel to the axial direction of the dandy roll 1.
A water injection nozzle 12 for injecting cleaning water from the outside is attached to the outside of the cleaning box 13.
Is provided, and the cleaning mechanism 1 is provided in the cleaning box 13.
4 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an external cleaning device for a dandy roll arranged in a wire part of a Fourdrinier paper machine.

[0002]

[Prior art]

 Generally, in the papermaking by a Fourdrinier paper machine, the solid content supplied from the head box is 0. About 3 to 1.0% by weight of pulp slurry is sprayed on a continuously running fine mesh forming wire, and in the process of moving on this wire (wire part), forced dehydration and natural dehydration by foil or suction box are performed. The concentration is gradually increased to form a wet paper web layer, and finally, a wet state of about 20% by weight of solid content is obtained, and the wet paper web is sent to the next press and dryer process. Then, dandy rolls having a mesh-shaped roll surface are usually arranged on the front and rear sides of the wire part for the purpose of improving formation, paper quality or watermarking.

That is, as shown in FIG. 3, the dandy roll 1 is rotated in the forward direction with the wire 2 while being immersed in the pulp slurry 3 on the forming wire 2 at a depth of about 0.5 mm. The pulp slurry 3 is squeezed at the nip entrance side, its moisture flows into the inside of the roll through the mesh of the dandy roll 1, the wet paper web layer is tightened, and at the same time the fibers are redistributed, and the nip exit is performed. On the side, the squeezed water inside the roll flows out again, so that the roll surface is separated from the wet paper web layer smoothly, and the formation of the wet paper web layer is significantly improved to make the surface smooth and extremely excellent in paper quality. Give good results. In the case of watermarking, the roll surface is provided with a convex portion that constitutes a pattern or character, and a thin portion (watermark) is formed on the wet paper web layer by pressing the convex portion.

In general, the roll body of the dandy roll 1 has a horizontal strip truss made of a thick wire that penetrates in the roll width direction in a main frame (coil) in the form of a vertical strip that forms a spiral along the circumferential direction. It is said that a spiral truss of thick wire is entangled in a diagonal cross shape, and a thin mesh receiving wire is spirally wound in the circumferential direction on the outer periphery of this frame, and a fine mesh upper net is covered on it. It has a very complicated structure. On the other hand, the pulp slurry 3 is mainly composed of pulp fibers, and contains other fillers such as talc and auxiliary additives such as sizing agents, dyes, defoaming agents, paper strengthening agents, and yield improving agents. ing. Therefore, the roll body of the dandy roll 1 in operation is empirically liable to be unevenly soiled by the components in the pulp slurry 3, and if left unattended, deposits will accumulate and become clogged. And the accumulated dregs are separated from the body of the roll and mixed in the pulp slurry 3, and spots called dandy blister appear on the surface of the paper, which deteriorates the paper quality.

Therefore, conventionally, as a means for keeping the dandy roll 1 clean, a washing water pipe 4 and a steam pipe 5 are provided inside the dandy roll 1, and during the operation of the dandy roll 1, high pressure washing water and steam are injected. In addition to performing the internal cleaning by means of the above, since the cleaning power is insufficient due to the restriction of the ejection pressure only by this internal cleaning, a cleaning pipe 6 having a large number of fixed nozzles 6a is also provided on the outside and these nozzles 6a ... A method is adopted in which cleaning water is sprayed onto the roll surface to perform external cleaning. Reference numeral 7 in FIG. 3 denotes a saveall arranged close to the wire running upstream side of the Dandy roll 1, and is provided with gutters 7a and 7b which are open to the Dandy roll 1 side and which extend along the roll width direction at the lower part. By receiving the cleaning water sprayed from the cleaning water pipe 4 inside the roll and the nozzle 6a on the outside, and discharging it from the drain port 7c on the lower side, the cleaning water falls on the pulp slurry 3 and the ground. Performs a function of preventing the disorder.

[0006]

[Problems to be solved by the device]

 However, since the sprayed cleaning water and the mist of the rolled up pulp slurry are always kept in a mist around the dandy roll 1 in operation, the conventional cleaning means described above particularly The surface of the nozzles 6a of the arranged cleaning pipe 6 gets wet, and the components in the pulp slurry 3 adhere to the surface itself to cause stains and dew drops, and the accumulated dirt residue also causes spots on the wet paper web layer. There is a problem that unevenness in thickness (eyeballs) may occur, resulting in deterioration of paper quality, and in severe cases, it may be a factor of paper breakage.As a countermeasure, for example, once a day, the papermaking process In the stopped state, the nozzles 6a ... themselves have to be cleaned with a great deal of labor and time using a jet cleaner or the like.

In view of the above situation, the present invention has sufficient cleaning ability as an external cleaning device for dandy rolls, and keeps the device clean at all times, so that the contamination of the device itself adversely affects the paper quality. The purpose of the present invention is to provide a product that does not cause damage and is structurally simple and easy to manufacture and install.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, an external cleaning device 10 for a dandy roll according to claim 1 of the present invention comprises a moving member 11 that reciprocates in parallel with the axial direction of the dandy roll 1 arranged in a wire part of a paper machine. Is attached to the roll surface 1a of the dandy roll 1 with a water jet nozzle 12 for spraying washing water from above the outside, and the moving member 11 is moved laterally outside the roll surface 1a of the dandy roll 1. A cleaning box 13 in which the water jet nozzle 12 is housed is provided at the end of the storm, and a cleaning mechanism 14 for the water jet nozzle 12 housed therein is provided in the cleaning box 13. Is.

According to claim 2 of the present invention, the spray direction of the water spray nozzle 12 in the external cleaning device 10 of claim 1 is 10 to 30 degrees in the axial direction of the dandy roll 1 with respect to the vertical line. It adopts a configuration that is set so as to form an angle.

[0010]

[Action]

 The water injection nozzle 12 attached to the moving member 11 sprays the cleaning water onto the roll surface 1a while moving along the axial direction of the dandy roll 1, so that the outer surface of the entire roll surface can be cleaned and the water injection nozzle can be used. 12 itself is automatically cleaned in the cleaning box 13 to remove dirt. Therefore, even if the surface of the moving water jet nozzle 12 gets wet due to the attachment of mist, the water jet nozzle 12 is set so as to enter the cleaning box 13 at every predetermined number of reciprocations, so that the dirt can be removed. The surface of the paper can be cleaned before it accumulates and causes dross or dew, which prevents the deterioration of paper quality due to dew and dross, and prevents jetting when the papermaking process is stopped as in the past. The troublesome cleaning operation of the cleaning device itself by a cleaner is unnecessary.

However, if the spray direction of the water spray nozzle 12 is set so as to form an angle of 10 to 30 degrees in the axial direction of the dandy roll 1 with respect to the vertical line, the intersection of the skeleton of the roll barrel and the main part Since the washing water is effectively applied to the side surface of the frame, the space between the net receiving wire and the upper net, the corners of the complicated roll cylinder can be washed cleanly. However, if the angle is less than 10 degrees, the cleaning action based on the spraying angle is not sufficiently exerted, and if it is more than 30 degrees, the cleaning water becomes difficult to pass into the interior of the dandy roll 1 and the cleaning function deteriorates. Invite. A more preferable range of the angle is 15 to 25 degrees.

[0012]

【Example】

 1 and 2 show an embodiment in which an external cleaning device 10 of the present invention is provided on a dandy roll 1 of a wire part of a paper machine. The dandy roll 1 itself has the same structure as that of the conventional one, and inside thereof, a washing water pipe 4 for injecting high-pressure washing water obliquely upward to the upstream side in the moving direction of the forming wire 2 and also to the downstream side. A steam pipe 5 for injecting water vapor downward is obliquely installed, and the pulp slurry 3 placed on the wire 2 is immersed in a depth of about 0.5 mm in the order of the wire 2. It is set to rotate in the direction. Further, on the upstream side of the wire running of the dandy roll 1, a saveall 7 having the same gutters 7a and 7b and a drainage port 7c as that in the conventional case is installed in the vicinity of the dandy roll 1.

A guide rail 15 having a substantially inverted T-shaped cross section is arranged on the saveall 7 in parallel with the axis of the dandy roll 1, and a drive chain 16 reciprocally driven on the guide rail 15. Are arranged in parallel with each other, and the moving member 11 engaged with the drive chain 16 is movably mounted over the guide rail 15 via the rollers 11a, 11a on both sides. Reference numeral 12 denotes a water injection nozzle attached to the moving member 11, the base side of which is held by the moving member 11 and extends horizontally above the dandy roll 1, and the tip side of which branches into two forks is above the top of the dandy roll 1. The nozzle openings 12a, 12a at both ends of the branched ends are inclined inwardly at an angle of about 20 degrees with respect to the vertical line in the axial direction of the dandy roll 1 (Fig. 1), the cleaning water supplied from the flexible hose 17 connected to the base end is sprayed obliquely from both nozzle openings 12a, 12a to the top of the roll surface 1a of the dandy roll 1.

On the other hand, a cleaning box 13 having a slit-shaped opening 13a corresponding to the shape of the tip end side of the water jet nozzle 12 is installed on one end side of the dandy roll 1 outside the roll surface 1a, and moves. The water jet nozzle 12 is set so as to be housed in the cleaning box 13 through the slit-shaped opening 13a at one end of the movement stroke of the member 11 as shown by the phantom line in FIG. A water injection pipe 14 is provided in the cleaning box 13, and when the water injection nozzle 12 is housed in the cleaning box 13, the cleaning water introduced from the water supply pipe 18a is injected into the cleaning box 13. The water jet nozzle 12 is washed by jetting from a large number of nozzle openings 14a of the pipe 14 and then discharged from a drain pipe 18b at the bottom.

In the above-described external cleaning device 10, the drive water of the drive chain 16 causes the cleaning water sprayed from the water spray nozzle 12 to normally move the reciprocating stroke of the moving member 11 at all times. The range is set to cover the entire width, for example, the moving speed is set to 1 round trip / 2 minutes, and the water jet nozzle 12 is set to retire in the cleaning box 13 after every 5 round trips (10 minutes) of cleaning. By automatic control of the water supply system, the water injection from the water injection nozzle 12 at the time of retire is stopped, and instead, the cleaning water is set to be automatically supplied to the water supply pipe 18a. Here, the injection pressure of the water injection nozzle 12 is about ² to 30 Kg / cm ² , but this injection pressure is adjusted according to the operating conditions of the papermaking process, the type of pulp slurry 3, etc. The output pressure may be set to change in intensity. The supply of cleaning water to the cleaning water pipe 4 in the dandy roll 1 and the supply of steam to the steam pipe 5 are continued at a predetermined flow rate while the papermaking process is operating.

According to the above configuration, during operation of the papermaking process, the rotating dandy roll 1 is externally cleaned on its entire roll surface by the cleaning water sprayed from the water spray nozzle 12 that reciprocates along the axial direction of the dandy roll 1. At the same time, the inside is cleaned by the cleaning water from the cleaning water pipe 4 and the steam from the steam pipe 5, and is always kept clean. At this time, in particular, since the spraying direction of the water spray nozzle 12 is inclined in the axial direction of the dandy roll 1 with respect to the vertical line, the intersection of the frame of the roll cylinder, the side surface of the main frame, the mesh receiving wire and the upper net The cleaning water is effectively applied to the spaces between the parts, and even the corners of the complicated roll cylinder are cleaned cleanly. Therefore, the clogging of the Dandy roll 1 due to the accumulation and accumulation of the components of the pulp slurry 3 and the mixing of the accumulated and accumulated meal into the pulp slurry 3 are avoided, and the formation and paper quality improving effect of the Dandy roll 1 is sufficiently exerted. And good paper quality is obtained.

Although the surface of the moving water jet nozzle 12 is wetted by mist, the water jet nozzle 12 is automatically cleaned in the cleaning box 13 every predetermined number of reciprocations to remove dirt. Since it is dropped, the generation of dregs and dew drop due to the accumulation of dirt can be prevented in advance, so that the deterioration of the paper quality and the paper breakage due to the dirt of the water jet nozzle 12 can be surely avoided, and the conventional papermaking method can be used. The troublesome operation of cleaning the external cleaning device itself with a jet cleaner while the process is stopped becomes unnecessary. Further, when the water injection nozzle 12 needs to be replaced due to clogging or the like, the moving member 11 can be easily positioned outside the side of the dandy roll 1 by positioning the moving member 11 at the end of the stroke.

The external cleaning device of the present invention is not limited to the configuration of the above-described embodiment, and for example, the cleaning boxes 13 are provided on both sides of the dandy roll 1 or two moving members 11 are used to dandy each. It is also possible to adopt a configuration in which one half of the entire length of the roll is responsible for cleaning, and the moving member 11 is reciprocally moved by a drive system other than a drive chain such as a screw shaft or fluid pressure cylinder. Further, the structure and position of the moving member 11 and its moving guide portion, the shape of the water jet nozzle 12, the structure of the cleaning box 13 and the cleaning mechanism inside thereof, the shape of the saveall 7, the type of the internal cleaning device, etc. The detailed configuration can be modified in various ways other than the embodiment.

[0019]

[Effect of device]

 According to the invention of claim 1, as an external cleaning device for a dandy roll used in a wire part of a Fourdrinier paper machine, the dandy roll has a sufficient cleaning capability and can keep the dandy roll clean at all times. Since the water jet nozzle of the device itself is automatically cleaned regularly during the papermaking process, dirt does not build up on the surface of the water jet nozzle to cause residue or dew, and to prevent dirt on the washing device. It is possible to reliably prevent the deterioration of the paper quality and the paper cut resulting from the operation, to easily perform the replacement operation of the water injection nozzle, and to provide the one that is structurally simple and easy to manufacture and install.

According to the second aspect of the present invention, there is provided, as the external cleaning device, a device which can clean the corners of the complicated roll cylinder of the dandy roll cleanly.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional front view of a main part of a wire part in a papermaking process to which an external cleaning device according to an embodiment of the present invention is applied.

FIG. 2 is a vertical sectional side view of the main part of the wire part.

FIG. 3 is a vertical sectional side view of a wire part main part in a papermaking process to which a conventional external cleaning device is applied.

[Explanation of symbols]

 1 dandy roll 1a roll surface 2 forming wire 3 pulp slurry 7 saveall 10 external cleaning device 11 moving member 12 water injection nozzle 12a nozzle opening 13 cleaning box 14 water injection pipe (cleaning mechanism) 14a nozzle opening 15 guide rail 16 drive chain

Claims (2)

[Scope of utility model registration request] 1. A water injection nozzle for injecting cleaning water from the outside onto the roll surface of the dandy roll is attached to a moving member that reciprocates in parallel with the axial direction of the dandy roll arranged in the wire part of the paper machine. At the same time, a cleaning box for accommodating the water injection nozzle at the end of the movement stroke of the moving member is provided on the side of the roll surface of the dandy roll, and the water injection nozzle accommodated in the cleaning box. External cleaning device for dandy rolls equipped with the above cleaning mechanism. 2. The external cleaning device for a dandy roll according to claim 1, wherein the spraying direction of the water spray nozzle is set to form an angle of 10 to 30 degrees with respect to the vertical line in the axial direction of the dandy roll.