JPH02259184A - Tail-sucking apparatus - Google Patents

Abstract

PURPOSE:To surely perform the peeling of the tail part of a wet paper from a wire and the guiding of the peeled tail part by dividing a channel connected to a vacuum suction part into two parts consisting of a tail part and a channel other than the tail part and attaching a rotary valve to the channel other than the tail part. CONSTITUTION:A tail-sucking apparatus 20 is constructed of a vacuum chamber 32 formed of a partition wall 25, a slide base 26 and an inner cylinder 24. The vacuum chamber 32 is connected to a vacuum apparatus via a channel (a) of the slide base 26, a channel (b) of the inner cylinder 24 and a channel (c) of a saddle 22. A channel (d) of the inner cylinder 28 is connected to the vacuum apparatus through a channel (e) of the inner cylinder 24, a channel (f) of the saddle 22 and a channel provided with a rotary valve 28.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tail suction device applied to a suction pickup roll installed in a wire part of a paper machine.

(Prior Art) FIGS. 5 and 6 show a suction pickup roll 6 (hereinafter referred to as roll 6) provided in a conventional paper machine to prevent wet paper from being transferred from the wire part to the press part.

The wet paper (or paper stock) 1 that has been conveyed while being dehydrated by a wire 4 is separated into a tail portion 2 and a non-tail portion 3 by a water geso I from a nozzle (not shown) installed in the wire part. I get angry. The wet paper web 1 that is not adsorbed by the roll 6 is dropped into a pit (in the direction of arrow B) by the wire 4 and then collected and reused.

When the roll 6 rotates to the adsorption position, the wet paper 1 is strongly moved through the felts 1-5 running in the direction of rotation of the roll 6 in a high vacuum chamber 7 partitioned by the partition wall of the roll 6. It is adsorbed, subjected to ff1l+ by the wire 4, and guided to move in the direction of the first stage press roll (arrow A), not shown, while being adsorbed in the low vacuum chamber 8 partitioned by the partition wall of the roll 6. , the portion 3 other than the tail is dropped into a pit (arrow B) by a wire 4 until the tail portion 2 passes through the first press roll. Further, the passage d in the roll 6, which is connected to the vacuum device, and the high vacuum chamber 7 and low vacuum chamber 8 are connected through a plurality of large diameter holes 1° and small diameter holes 11, respectively, and are arranged at predetermined heights and lows. The degree of vacuum is maintained.

(Problem to be Solved by the Invention) There are maximum and minimum widths of paper to be made, and in order to cope with the maximum paper width, high and low vacuum chambers 7 and 8 are provided in the vacuum suction section of the suction pickup roll 6. Since the length in the paper width direction is set, if the paper has a paper width other than the maximum paper width, especially paper with the minimum paper width, use the felt 5 to re-evacuate the vacuum chamber 7.
8 is covered, but the degree of vacuum in the re-vacuum chamber is low due to the air permeability of the felt 5. Therefore, wet paper 1 from wire 4
Peeling off the paper, guiding the tail portion 2 to the press part, etc. were not performed smoothly, and the paper threading sometimes ended in failure. In addition, even for paper with the maximum paper width, the wet paper 1 is peeled off from the wire 4 in the high vacuum chamber 7, and the wet paper 1 is guided in the low vacuum chamber 8, but the suction in the low vacuum chamber 8 is Because of its weakness, the tail portion 2 could not be guided reliably in some cases.

The present invention was proposed to solve the above problems.

(Means for Solving the Problems) For this reason, the present invention provides a method for passing the wet paper from the wire part of the paper machine to the vacuum suction part of the suction pickup roll at the entrance of the press part. In order to adsorb the tail part, which is a part of the wet paper that is guided to the wet paper, regardless of the paper width of the wet paper, the tail part The passage is divided into a passage leading to a vacuum chamber that adsorbs the wet paper web, and a passage leading to high and low vacuum chambers that adsorb parts of the wet paper paper other than the tail part, and a rotary opening/closing valve is installed in the passage leading to the part of the wet paper paper other than the tail part. The purpose of this is to provide a means for solving problems.

(Function) By dividing the passage leading to the vacuum suction part into two parts, a tail part and a passage other than the tail part, the vacuum degree of each passage can be controlled separately. By adjusting the degree of occlusion of the on-off valve, the degree of vacuum in the passage in the tail portion can be increased. In addition, the width of the tail portion varies slightly depending on the paper quality, but if the paper quality is the same, it is constant regardless of the size of the paper width. It can be used as a room. Therefore, since this vacuum chamber can be moved according to the width of the paper, there is no drop in the degree of vacuum that would occur in a vacuum chamber with extra width when it cannot be moved, and a high degree of vacuum is maintained regardless of the width of the paper. I can do it.

(Example) The present invention will be described below with reference to the embodiments shown in the drawings. Fig. 1 shows the operation side end of a suction pickup roll 21 (hereinafter referred to as roll 21) provided with a tail suction device 20 according to an embodiment of the present invention. The tail suction device 20 is composed of a vacuum chamber 32 formed by a partition wall 25, a slide base 26 that supports the partition wall 25, and an inner cylinder 24 that passes through the vacuum chamber 32 and leads to a passage C of the saddle 22. . Further, the slide base 26 can be moved in the axial direction of the roll 21 by a shifter 27. - The power cylinder vacuum chamber 7 and the low vacuum chamber 8 are formed by a plurality of large diameter holes 10 and small diameter holes 11 in the passage d of the inner cylinder 23.
The vacuum level of high and low vacuum chambers 7 and 8 is at hole 10.
and 11.

Further, the inner cylinder 23 and the inner cylinder 24 are connected with bolts, and the saddle 22 is fitted into the inner cylinder 24. Therefore, the vacuum chamber 32 formed by the partition wall 25 that adsorbs the tail portion 2 is
It is connected to a vacuum device (not shown) through a passage a in the slide base 26, a passage in the inner cylinder 24, a passage C in the saddle 22, and a passage in the duct 31. Further, the passage d of the inner cylinder 23 is connected to the duct 31 via the passage g in which the rotary on-off valve 28 is installed, from the passage e of the inner cylinder 24 and the passage f of the saddle 22.
It is connected to the vacuum device through a passageway. The rotary on-off valve 28 is operated via a lever 30 in the cylinder 29 to adjust the degree of opening of the passage g. In addition, the rotary on-off valve 28
When the opening degree of path g is reduced, the degree of vacuum in path f decreases, and path C
The vacuum level of the vacuum chamber increases according to the vacuum level of the vacuum chamber. The positions of the vacuum chamber 32 at the maximum and minimum paper widths according to the present invention are shown in FIG.

(Effects of the Invention) The present invention is configured as described in detail below, and has a vacuum chamber dedicated to adsorbing the tail portion, so that it is easy to peel off the tail portion of the wet paper from the wire and press roll the wire portion. Guidance to the department will be ensured. Further, the degree of vacuum in the vacuum chamber of the tail portion can be freely controlled by a rotary opening/closing valve provided in the passage to the high-low vacuum chamber that adsorbs portions other than the tail portion. Furthermore, since the width of the tail portion is approximately constant, by moving the vacuum chamber of this constant width, the degree of vacuum in the vacuum chamber of the tail portion can always be maintained at a high level, regardless of the paper width to be made.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a tail suction device applied to a suction pickup roll showing an embodiment of the present invention, and FIG.
The figure is a cross-sectional view taken along the line X-X in FIG. 1, FIG. 3 is a Y-direction view in FIG. 6 is a side view showing a vacuum chamber of a conventional suction pickup, and FIG. 6 is a plan view thereof. Description of main parts of the figure 20 - Tail adsorption device 21 - Suction pickup roll 22 - Zadol 23. 24 - Inner cylinder 25 - Partition wall
26 - Slide base 28 - Rotary on-off valve 29 - Air cylinder 32 = - Vacuum chamber for adsorption of tail section a" - h - Passage umbrella small

Claims (1)

[Claims] When transferring wet paper from the wire part of the paper machine to the vacuum suction part of the suction pickup roll at the entrance of the press part, the tail part, which is a part of the wet paper that is guided to pass through the paper, is In order to adsorb paper regardless of the width of the paper being made, a passage from a vacuum device to the vacuum suction part of the suction pickup roll is passed through a vacuum chamber that adsorbs the tail part, and a part of wet paper other than the tail part. What is claimed is: 1. A tail suction device, characterized in that the tail suction device is divided into a passage leading to a high vacuum chamber and a low vacuum chamber for suctioning the paper, and a rotary opening/closing valve is provided in the passage leading to a portion of the wet paper web other than the tail portion.