JPH0748717Y2 - Water suction sealing structure of suction roll - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is designed to remove water from a suction roll, which is arranged in a wire part or press part of a paper machine to remove water from the web. The present invention relates to a water squeezing sealing structure that prevents the generated water from entering the bearing portion of the suction roll.

[Conventional technology]

For example, in the press part of a paper machine, the web stretched in the wire part which is the previous step is passed between a pair of rolls, and pressure is applied to the web to squeeze out water. However, a suction roll is used to discharge this squeezed water. That is, an appropriate number of through holes are formed in a portion of the outer peripheral surface of the suction roll which is in contact with the web, and the inside of the vacuum box inside the suction roll is communicated with the outside of the roll, and the vacuum box is vacuumed. It communicates with a pump and sucks the water.

Further, in the wire part, a suction roll is used as a couch roll, and the wire is passed through the outer peripheral surface of the suction roll to suck the moisture of the web stretched on the wire.

Then, this squeezed water passes through the side of the suction roll and is discharged to the outside. Since the bearing is disposed on the side of the suction roll, the squeezed water is applied to the bearing. It must be kept out of the way, which requires a water-tight sealing structure.

FIG. 3 shows a conventional water squeezing and sealing structure of this type, and is a cross-sectional view of the vicinity of a bearing section taken by cutting the suction roll 1 along a plane including a rotation shaft. In this suction roll 1, an inner roll 3 is fitted to a hollow main shaft 2, and a bearing 4 is fitted to an end portion of the main shaft 2. The inner ring of the bearing 4 is positioned by the outer sleeve 5 and the inner sleeve 6, and the inner sleeve 6 is sandwiched between the inner ring of the bearing 4 and the side surface of the inner roll 3.

A lid 7 is fitted to the outer ring of the bearing 4, and a shell 8 of the suction roll 1 is fitted on the outer peripheral surface of the lid 7 so that the shell 8 is rotatable with respect to the main shaft 2. It is provided. In addition, the shell 8 is formed with a large number of through holes 8a for communicating the inside and the outside.

A pair of wall bodies 3a are provided on the outer peripheral surface of the inner roll 3 along the direction of the main shaft 2 with their outer edges being in the vicinity of or in contact with the inner surface of the shell 8 and separated by the pair of wall bodies 3a. The suction box 9 is formed by the formed part. The suction box 9 is arranged at a portion corresponding to a portion of the suction roll 1 through which the web passes. And this suction box 9
Communicates with a suction device (not shown) such as a vacuum pump through a hollow portion of the main shaft 2, and the suction box 9 communicates with a space portion 10 in which the inner sleeve 6 is disposed through a slight gap. There is.

A shield wall portion 6a extending parallel to the main shaft 2 is formed in a portion of the inner sleeve 6 located in the space portion 10 so as to shield a part of the space portion 10, and the lid body 7 is also provided. In a portion facing the space portion 10 and located inside the wall portion 6a, a wall portion 7a extending parallel to the main shaft 2 is formed so as to block a portion of the space portion 10. Has been done. That is, the shielding wall portions 6a and the shielding wall portions 7a are alternately arranged to block the path from the space portion 10 to the bearing 4.

Further, an appropriate number of oil grooves are formed on the outer peripheral surface of the inner sleeve 6.

The water squeezed from the web passing through the portion of the shell 8 facing the suction box 9 passes through the inside of the main shaft 2 and is drawn by a suction device (not shown) to be discharged.

[Problems to be solved by the device]

However, in the above-described conventional water-sealing sealing structure, the suction box 9 and the portion where the bearing 4 is provided are
The space 10 is shielded by the barriers 6a and 7a. However, since the gap between the barriers 6a and 7a is large, water may enter the bearing 4. Further, the through hole 8a formed in the shell 8 is also formed at the end portion of the shell 8, and the squeezed water enters the space portion 10 through the through hole 8a formed in the end portion and enters the bearing 4. Will be reached.

Then, when the water is squeezed into the bearing 4, the lubricating oil such as grease enclosed in the bearing 4 is emulsified and loses the oil and fat and flows out from the bearing 4. Therefore, poor lubrication occurs, rust occurs, or the bearing 4 wears. Further, the leaked lubricating oil may adhere to the web passing through the suction roll 1.

Moreover, since the squeezed water contains impurities, it is not preferable to enter these bearings 4.

Then, this invention aims at providing the water-squeezing sealing structure of the suction roll which prevented the water | moisture content squeezed out from the web from invading into a bearing part as much as possible.

[Means for Solving the Problems]

For the above-mentioned purpose, the water squeezing sealing structure according to the present invention is such that the shell rotates with respect to the inner roll provided with the vacuum box, and squeezes and sucks the moisture of the web passing through the surface of the shell, In a suction roll in which a bearing is disposed between the inner peripheral portion of the lid body in which the shell is fitted to the outer peripheral portion and closes the side end portion of the shell, and the outer peripheral portion of the journal portion of the inner roll, A cylindrical bearing pressing ring is provided which is sandwiched between the inner ring of the bearing and the side surface of the inner roll, and the outer side portion of the side surface of the inner roll is provided along a circumference of a diameter appropriately larger than the outer diameter of the bearing pressing ring. An annular water-sucking receiving collar having a circumferential groove is provided, which is a portion of the lid body facing the side surface of the inner roll and is an outer peripheral surface of the bearing pressing ring and an inner peripheral surface of the water-sucking receiving collar. In the position between The provided Irushiru, the inner peripheral portion of the oil seal is characterized in that in contact with the outer peripheral surface of the bearing retainer ring portion.

[Action]

The water that is squeezed out by the suction roll when the web passes is drained from the vacuum box through the drainage port. At this time, since the vacuum box and the bearing portion are in communication with each other, the squeezed water tends to form water droplets and flow into the portion where the bearing is arranged. In addition, the water squeeze tries to flow into the bearing through the through hole formed at the end of the shell.

At this time, the water is poured into the annular groove of the water receiving collar. The squeezed water that has flowed into the groove portion flows downward along the groove portion, and therefore is discharged outside from the lower portion of the suction roll without reaching the bearing. Further, the squeezed water that overflows from the groove portion and tries to flow into the bearing portion is blocked by the inner peripheral portion of the oil seal and does not reach the bearing.

〔Example〕

Hereinafter, a suction water sealing structure for a suction roll according to the present invention will be specifically described with reference to the illustrated embodiment.

In the suction roll 20, an inner roll body 22 is fitted to a hollow main shaft 21 to form an inner roll, and a part of the main shaft 21 forms a journal portion 22a of the inner roll.
And a shell 25 is rotatably supported around the main shaft 21. That is, the inner ring of the bearing 23 is fitted to the journal portion 22a of the inner roll, the lid 24 is fitted to the outer ring of the bearing 23, and the shell 25 is fixed to the outer peripheral portion of the lid 24. The shell 25 is rotatable about the main shaft 21.

The outer peripheral surface of the inner roll main body 22 is appropriately separated from the inner peripheral surface of the shell 25, and is a part of the outer peripheral surface of the inner roll main body 22, and the web W of the shell 25 (second shown) passes therethrough. Walls along the axial direction at each end of the range corresponding to the part
22b is provided. An opening 22c communicating with the inside of the main shaft 21 is formed in a part of the inner roll main body 22 which is sandwiched by the pair of wall bodies 22b. Further, the front end edges of the pair of wall bodies 22b face the inner peripheral surface of the shell 25, and a range surrounded by the pair of wall bodies 22b is a vacuum box 26, and the vacuum box 26 is the main shaft 21. A suction device (not shown) such as a vacuum pump communicates with the inside of the device. An appropriate number of through holes 25a are formed in the shell 25 so that the inside and outside of the shell 25 are communicated with each other. Therefore, the portion of the shell 25 facing the vacuum box 26 is a web W.
When the paper passes, the water is sucked from the web W by the suction device (not shown). The through hole 25a is also formed at the end of the shell 25, which is separated from the vacuum box 26.

The lid 24 closes the side of the shell 25.
A space 27 is formed between the inner surface of 24 and the side surface of the inner roll body 22. As shown in FIG. 1, the end of the vacuum box 26 in the axial direction is sealed with rubber.
Although it is closed by 26a or the like, since the shell 25 must rotate smoothly, the end portion is not completely closed, and therefore the space portion 27 communicates with the vacuum box 26. . Further, a cover 24a is put on the outside of the lid 24, and a set screw is provided together with the cover 24a.
The lid 24 and the shell 25 are fixed by 24b or the like.

A water sealing collar 30 is fixed to the side surface of the inner roll body 22 in the space 27. This sealing color
A cylindrical bearing pressing ring portion 31 for positioning the bearing 23, which is interposed between the side surface of the inner ring of the bearing 23 and the side surface of the inner roll 22, is formed on the inner peripheral portion of the bearing 30. Further, the outer peripheral portion of the water sealing collar 30 is directed to the lid body 24, and the tip end surface is projected to a position close to the lid body 24, and an annular groove portion 32a is formed on the outer peripheral surface. A collar portion 32 is formed.

As shown in FIG. 2, the bearing pressing ring portion 31 and the water squeezing receiving collar portion 32 are formed in a substantially U-shaped cross section together with the portion of the water sealing collar 30 fixed to the inner roll body 22. ing. Inside the U-shaped cross section, a seal case 28 fixed to the surface of the lid body 24 facing the side surface of the inner roll body 22 is located, and an appropriate number of oil seals are attached to the seal case 28. 29 are held. The inner edges of the oil seals 29 are in contact with the outer peripheral surface of the bearing pressing ring portion 31.

The outer surface of the inner ring of the bearing 23 is pressed by the bearing retainer 36 fitted to the journal portion 22a of the inner roll,
The bearing 23 is positioned in cooperation with the bearing pressing ring portion 31. Further, the inner peripheral side end 24c of the cover 24a extends in a state of facing the outer peripheral surface of the bearing retainer 36, and an oil groove is formed on the opposing surfaces of the bearing retainer 36 and the inner peripheral side end 24c. ing.

The operation of the water squeezing sealing structure according to the present invention constructed as described above will be described below.

The web W passing through the suction roll 20 passes through the portion where the vacuum box 26 is arranged, so that the water contained in the web W is squeezed out and the through hole of the shell 25 is formed.
It is sucked from 25a. This squeezed water flows into the vacuum box 26 from the through hole 25a, passes through the inside of the main shaft 21 having the journal portion 22a, and is discharged from a drain port (not shown). In addition, a part of the squeezed water that has flowed into the vacuum box 26 communicates with the vacuum box 26.
Flow into. Alternatively, since the through hole 25a formed at the end of the shell 25 does not communicate with the vacuum box 26 but communicates with the space 27, the water squeezing is provided at the end of the shell 25. It will flow into the space 27 through the through holes 25a.

The water that has flowed into the space 27 flows into the groove 32a of the water receiving collar 32, and stays in the groove 32a. The accumulated squeezed water flows downward along the groove 32a and is discharged from the lower part of the shell 25 to the outside, so that it does not reach the bearing 23.

Further, the squeezed water overflowing from the groove 32a flows into the space 27,
It tries to flow into the bearing 23 by being transmitted to the outer peripheral surface of the bearing pressing ring portion 31. However, since the inner edge of the oil seal 29 is in contact with this outer peripheral surface, the oil seal 29 blocks the space portion 27 from the bearing 23, so that water does not flow into the bearing 23. Moreover, the bearing 23 of the oil seal 29
When comparing the pressure on the side with the pressure on the space 27 side,
Since the space 27 has a negative pressure, the oil seal 27
Due to this pressure difference, the inner edge of the bearing securely adheres to the outer peripheral surface of the bearing retaining ring portion 31. Therefore, the water squeezing bearing
It can be surely prevented from flowing into 23.

In this embodiment, the sealing collar 30 is attached to the bearing pressing ring portion 31.
Although the water press receiving collar portion 32 and the water press receiving collar portion 32 are formed, the bearing pressing ring portion 31 and the water press receiving collar portion 32 may be configured separately and incorporated respectively.

Further, in the present embodiment, the inner roll is described as having a structure in which the inner roll main body 22 is fitted to the main shaft 21, but the main shaft 21 and the inner roll main body 22 may have an integrated structure. I do not care.

[Effect of device]

As described above, according to the water squeezing sealing structure of the present invention, the water squeezing is retained before the water squeezing flows into the space formed between the lid of the shell and the side surface of the inner roll. Since the groove portion is provided on the outer side portion of the side surface of the inner roll, the squeezed water flowing into the groove portion flows downward along the groove portion and is discharged to the outside from the lower portion of the shell, so that the squeezed water flows to the bearing. It can be prevented from flowing. Further, by bringing the inner end edge of the oil seal into contact with the outer peripheral surface of the bearing pressing ring portion for positioning the bearing, the space portion and the bearing are blocked by the oil seal. Can be reliably prevented from flowing into the bearing.

Therefore, the lubricating oil of the bearing is not affected by the water squeezing, and therefore the bearing can be prevented from being worn or seized as much as possible.

[Brief description of drawings]

The drawings show an embodiment of a water suction sealing structure for a suction roll according to the present invention. FIG. 1 is a partially omitted perspective view showing a cross section of the vicinity of a bearing portion of a suction roll taken along a plane including a shaft. FIG. 2 is a partially omitted sectional view of the vicinity of the bearing section, similarly cut along a plane including the shaft. FIG. 3 shows a conventional water-sealing structure, and is a partially omitted cross-sectional view corresponding to FIG. 20 …… Suction roll, 21 …… Spindle 22 …… Inner roll, 23 …… Bearing 24 …… Lid body, 25 …… Shell 25a …… Through hole 26 …… Vacuum box 27 …… Space part, 28 …… Seal Case 29 …… Oil seal, 30 …… Sealing collar 31 …… Bearing retainer ring 32 …… Squeezing receiving collar, 32a …… Groove W …… Paper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Nagano Kochi Nagano 5-chome, Toyooka, Asahikawa, Hokkaido No. 5 (72) Teruo Tamura Kochi Nagamura Nijo 8-chome, Asahikawa, Hokkaido (72) Eiji Yagami, Asahikawa Hokkaido City Kagura Rokujo 8 chome Nobunchi (56) References JP-A-62-24022 (JP, A) Jitsuko-Sho 53-37041 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A shell rotates with respect to an inner roll provided with a vacuum box to squeeze out and suck the moisture of the web passing through the surface of the shell, and the shell is fitted to the outer peripheral portion of the shell. In the suction roll in which the bearing is arranged between the inner peripheral portion of the lid body that closes the side end portion and the outer peripheral portion of the journal portion of the inner roll, in the inner ring of the bearing and the side surface of the inner roll. A cylindrical bearing pressing ring to be sandwiched is provided, and an annular water squeeze is provided on the outer side portion of the side surface of the inner roll, the groove having a circumferential direction that is appropriately larger than the outer diameter of the bearing pressing ring. An oil seal is provided at a portion of the lid body facing the side surface of the inner roll and between the outer peripheral surface of the bearing pressing ring and the inner peripheral surface of the water pressing receiving collar. sticker An inner peripheral portion of the suction roll is in contact with an outer peripheral surface of the bearing pressing ring portion, and a water suction sealing structure for a suction roll.