JPH0236720B2 - SUKIGAMIZAIKANSOTO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a paper material drying cylinder useful for single-tube or multi-tube drying devices that are frequently used in the paper and pulp industries.

[Prior art]

The drying cylinder with internal steam heating used in the drying apparatus, in which a wet paper material such as paper or pulp is engaged and dried by heating, is well known, and heat is radiated from the surface of the end plate of the drying cylinder. The amount of heat dissipated is generally only about 4% of the total amount of heat dissipated by the rotating tubes, but in recent years, as paper machines have become faster, the number of rotating tubes used in the drying equipment has exceeded 100. As the rotational speed of the rotating tube increases, the amount of heat dissipated from the end plate is also increasing and cannot be ignored.

Therefore, in order to suppress heat dissipation from this mirror plate,
For example, as shown in Utility Model Publication No. 48-039724, Utility Model Publication No. 60-040640, etc., glass wool is wrapped in a bag sewn from glass cloth with a specially treated surface and divided into semicircular shapes or smaller. The bags are joined together with heat-resistant fasteners or wire to form a circular insulating mat, and then attached to the end plate or shaft of the rotating tube using an outer circumferential mounting jig and an inner circumferential mounting jig, with or without eyelets. Insulation material fixed to the neck, thermal cover,
In addition, as shown in Japanese Utility Model Publication No. 61-00397 and Japanese Utility Model Application Publication No. 58-129494, the surface of the end plate is coated with a foamed resin, or the surface of the end plate is covered with a split heat insulating film. Various proposals have been made.

[Problem that the invention seeks to solve]

However, with the above-mentioned heat insulating materials and thermal covers, it is not possible to pack glass wool into the bag to a density that maximizes the heat insulating effect. In addition, there is unevenness in the thickness and density of the glass wool due to sewing.
Furthermore, due to the high speed of the rotating cylinder, the glass wool moves inside the bag, causing uneven thickness and density, which prevents the best insulation effect from being obtained, and also makes sewing and attaching the bag complicated. The economic significance of insulation is lost due to the high cost.

Furthermore, with the above-mentioned end plate covered with foamed resin or with split insulation membrane, the high cost due to the complexity of sewing and mounting the bag as mentioned above can be eliminated, but due to the strong centrifugal force caused by the high speed of the rotating cylinder, Another drawback was that it was not possible to make the foamed resin coating or the heat insulating membrane the thickness and density that would maximize the heat insulating effect.

In particular, as shown in Japanese Utility Model Application No. 60-165499, a circular heat-insulating board coated with a heat-resistant, flame-retardant special treatment agent, such as a silicone resin, and divided into sections, such as a high-density An outer periphery mounting jig in which a board made of compressed heat-resistant fibers (glass wool board or light cal board) is applied to almost the entire surface of the rotating barrel mirror part, and the outer periphery is fixed with screws and nuts attached to the outer periphery bolts of the mirror part by standing or welding. The inner periphery of the board is fixed by a rotary cylinder with an inner periphery mounting jig, which has a thickness of approximately 50 m/m and approximately 80 kg/m ³ to maximize its insulation effect. It is stated that since it became possible to use a heat insulating board with a density of , the amount of heat radiated from the mirror part could be reduced by about 50% compared to when the glass wool mat was used.

However, even with the proposal of the above-mentioned Japanese Utility Model Application No. 60-165499, the high cost caused by the complexity of joining the divided insulation boards together and attaching them to the rotating barrel mirror part cannot be solved. The reason is that the circumferential speed is 400m/min to 1500m/
In order to resist the strong centrifugal force in a rotating tube rotating at high speeds at min. In order to do this, the thickness and density of the reinforcing boards and mats must be increased, which increases the complexity of the reinforcing structures of the boards and mats, and the jigs for connecting and mounting them, resulting in high costs. Furthermore, the more complicated the reinforcing structure, connection and attachment jig, etc., are, the lower the workability, safety, and economic efficiency will be. This is reported in Special Publication No. 58-500860 and Japanese Patent Publication No. 58-191293.
The same applies to what is shown in the publication.

[Technical issues]

Therefore, the present invention eliminates the complexity of attaching divided heat insulation boards and mats to the rotating tube, and allows the thickness and density of the boards and mats to be arbitrarily determined to maximize the heat insulation effect. Equipped with a heat insulating lid of an extremely simple structure capable of covering the entire heat dissipating surface of the end plate of the rotating cylinder without being affected by the strong centrifugal force at all even if the rotating cylinder of the drying cylinder rotates at any speed and at any high speed. There are technical issues in trying to realize a paper material drying cylinder.

[Means for solving problems]

In order to achieve the above-mentioned technical problem, the paper material drying cylinder according to the present invention is an internally heated drying cylinder in which wet paper material is engaged and heated to dry, and the drying cylinder covers the entire heat dissipation surface of the end plate of the rotary cylinder. An annular heat insulating lid having an outer circumferential portion close to the rotary tube and an inner circumferential portion fitted over the shaft neck of the rotary tube is fixed in position to the machine frame supporting the rotary tube via a rotating member. The rotary cylinder and the outer and inner peripheral parts of the heat insulating lid are sealed by sealing members in the circumferential direction to form an airtight heat insulating chamber between the rotary cylinder and the heat insulating lid. Become.

The heat-insulating lid used in the paper drying cylinder according to the present invention is a cloth bag whose surface is coated with a heat-resistant special treatment agent such as silicone resin and woven with heat-resistant fiber threads such as glass fiber and aramid fiber. Heat-resistant pine, which is divided into semi-circular or smaller shapes filled with bulky glass fiber cotton, heat-resistant foamed resin, and other insulating materials, is placed into a circular assembly frame made of heat-resistant plates such as metal molded plates with eyelets and bolts. ,
They are fixed using mounting jigs such as nuts, and are closed and connected in a ring shape with heat-resistant fasteners, wire, heat-resistant fiber thread, etc. sewn to their respective joints.
Mat with a thickness of 20m/m or more and a density of 10Kg/m3 or ^more , or glass wool board with a thin metal plate such as aluminum foil attached to the surface, or coated with a heat-resistant special treatment agent such as silicone resin, etc. A heat-resistant board made of high-density compressed heat-resistant fiberboard, light calboard, etc., divided into semi-circular or smaller shapes, and joined together in a circular shape with a joining fitting, etc., with a thickness of 5 m/m or more and a density of 50 kg/m. ^Three or more insulation boards are preferred, but a mat-shaped or board-shaped annular insulation lid made of any other known heat-resistant insulation material may also be used. Preferably, the heat insulating cover is formed by attaching a heat-resistant assembly frame such as a metal plate to the outer circumference or inner circumference of the heat insulating cover in order to reinforce the heat insulating cover.

The rotary cylinder, which is internally heated with a heating medium such as water vapor, with which the wet paper material is engaged and is heated and dried, is widely used in conventional single-tube or multi-tube dryers and is well-known, so it is particularly important to Not detailed.

In order to form an airtight heat insulating chamber between the rotating cylinder and the heat insulating lid, the space between the outer and inner peripheral parts of the heat insulating lid and each part or each surface part of the rotating cylinder facing each other in the circumferential direction is As the sealing members for each seal, for example, an annular flexible sheet made of a heat-resistant and abrasion-resistant material such as fluorine-based synthetic resin or synthetic rubber is used. Sheet packing, made of aramid fiber, formed of one or more separate and protruding sheets, the tips of each of which are in sliding contact in the circumferential direction with each surface of a rotary cylinder that faces each part of the heat insulating lid in close proximity to each other. Heat-resistant and abrasion-resistant fine hairs such as carbon fibers or various ceramic fibers are densely planted in the circumferential direction on the outer or inner circumference of the heat-insulating cover, and the tips of the fine hairs are close to each part of the heat-insulating cover. a brush pad that is in sliding contact with each surface of a rotating cylinder that faces each other;
One or more fins protruding from the outer periphery or the inner periphery of the heat insulating lid and extending in the circumferential direction in close proximity to each other,
The tip of each fin is located close to each surface portion of the rotary tube that faces each part of the heat insulating lid, or the rotary tube that faces the outer periphery or the inner periphery of the heat insulating lid, respectively. a labyrinth packing consisting of one or more pairs of fins extending circumferentially in close proximity to or in contact with each other and protruding from each part so as to engage with each other alternately; It is provided between the axial neck part of the cylinder or between the outer circumferential part of the heat insulating lid and the part of the rotating cylinder that closely opposes it, and allows the rotary cylinder part to rotatably support the heat insulating cover, and Although any well-known sealing member can be used, such as a sealed bearing that seals the space between the rotary cylinder and the heat-insulating cover in the circumferential direction, it is possible to use Since the outer diameter of the cylinder is usually about 1500 m/m or more, a labyrinth packing with low friction and good sealing effect is suitable.

One end of the insulation lid is bolted to the machine frame of the paper machine drying device that supports the rotating cylinder, and the other end is bolted to the assembly frame of the insulation lid, etc., so that the insulation lid is always in the same position regardless of the high speed rotation of the rotating cylinder. It must be fixed via a fixing member such as one or more fixing rods. In this case, it is most preferable that the heat insulating cover is supported and fixed to the machine frame at three points via fixing members.

In this way, an airtight internal heat-insulating chamber with excellent heat insulation properties is formed between the rotary cylinder and the heat-insulating lid.

[Effect] Said technical means work as follows.

The wet paper material, which has been dehydrated and rolled into a thin strip after passing through the wire mesh section and the water squeezing section of the paper machine, is then passed through the drying device of the paper machine, where it is partially exposed to the heat dissipating outer circumferential surface of the internally heated rotating cylinder. It is heated and dried.
At this time, most of the heat radiated from the rotary tube is absorbed by the paper material and used for heating it, but the heat radiated from the end plate of the rotary tube is released from the outer periphery so as to cover the entire heat radiating surface of the end plate of the rotary tube. An annular heat insulating lid, which is placed close to the rotating cylinder and whose inner circumference is fitted onto the shaft neck of the rotating cylinder, is positioned via a fixing member to the machine frame that supports the shaft end of the rotating cylinder via a bearing. The rotary cylinder and the heat insulating lid are fixed in place, and the space between the rotary cylinder and the heat insulating cover is sealed in the circumferential direction by a sealing member to form an airtight hollow heat insulating chamber between the rotary cylinder and the heat insulating cover. Therefore, heat dissipation to the atmosphere due to convection and radiation is prevented by being confined in the heat insulating chamber, and heat dissipation due to heat transfer is extremely small.

At this time, despite the high-speed rotation of the rotating cylinder, the heat-insulating cover is always stationary and fixed in position, and is completely insulated from the strong centrifugal force caused by the high-speed rotation. Not only can it be made to any desired thickness and density to achieve the highest performance, but it is also an insulating mat that is made by packing insulating materials such as glass wool into a low-density state inside an insulating bag to increase its porosity and improve its insulating properties. Even if there is, the insulation material inside the bag will not move to the periphery due to the strong centrifugal force, causing non-uniformity in the thickness and density of the insulation mat,
It can always provide the best insulation effect.

Furthermore, since the heat insulating lid does not rotate at high speed together with the rotating cylinder, sewing the heat insulating bag and joining and attaching the split heat insulating lid can be extremely simple and easy, and there is no need for the heat insulating lid with a reinforced structure, and a joining and mounting jig is required. An inexpensive item that can be easily disassembled and reassembled may also be used. Furthermore, the fixing members for supporting and fixing the heat insulating lid to the machine frame can be simple and inexpensive, and accidents such as parts such as joint mounting jigs loosening and flying off during operation do not occur at all, and the heat insulating lid Extremely superior workability, safety, economic efficiency, and operational stability, as there is no chance of paper dust or other debris adhering to the paper scattering around, contaminating the papermaking material and resulting in defective products. It has many advantages such as In addition, since there is no heat dissipated from the end plate of the rotating cylinder, the side edges of the paper material running inside the dryer are exposed to the hot air flow heated by the heat dissipation, resulting in overdrying and wrinkles and swelling. The things that occur are also eliminated.

〔Example〕

An embodiment of the paper material drying cylinder according to the present invention will be described in detail below with reference to FIG. 1, which shows a cross-sectional view.

In the above embodiment, the wet paper material p partially engages with the heat dissipating smooth outer circumferential surface and is heated and dried by internal water vapor v.
Covers the entire heat dissipation surface of the end plate 10 on the operating side (the left side when viewed in the axial cross-sectional view in FIG. 1) and the driving side (the right side when viewed in the axial cross-sectional view in FIG. 1) of the rotating cylinder 1 to be heated. As shown in FIG.
The inner peripheral part 22 is placed close to the rotary cylinder 1 and the shaft neck 16.
An annular heat insulating lid 2 fitted onto the rotary cylinder 1 is fixed in position via a rod-shaped fixing member 4 to a machine frame 3 that supports the rotary cylinder 1 via a bearing 30, and the rotary cylinder 1 and the insulating lid adjacent thereto 2 outer peripheral part 20 and inner peripheral part 22
An airtight heat insulating chamber 6 is formed between the rotary cylinder 1 and the heat insulating lid 2 by sealing them in the circumferential direction with sealing members 5.

The operation-side heat insulating lid 2 is made of a pair of semi-circular split frames formed from metal plates (or heat-resistant reinforced plastic plates), which are connected to each other by bolts and nuts 242 at their protruding ends 240 to form an annular shape. A glass fiber yarn woven cloth bag 21 whose surface is coated with silicone resin is attached to the formed divided assembly frame 24.
0g of glass fiber cotton with a density of approximately 30Kg/ ^m3 and a thickness of approximately
1 evenly packed and formed to have a width of 30m/m
A pair of semicircular mats are connected to each other with heat-resistant fasteners 212 sewn to the split ends of each mat, and a heat-insulating mat 21 formed into a ring shape is fitted, and the mats are divided into eyelets 214 attached to the heat-insulating mat 21. A bolt 244 protruding from the assembly frame 24 is passed through and tightened with a nut. In addition, the drive side insulation lid 2
In this method, a pair of closed-cell porous semi-circular mats made of a heat-insulating polymer material are formed into a circular ring shape with their split ends closely attached to each other, and the mats are fitted into a circular split assembly frame 24 having substantially the same structure as described above. A bolt 244 protruding from the split assembly frame 24 is passed through a through hole bored in the annularly formed heat insulating mat 21, and then tightened with a nut.

The heat insulating lid 2 is attached to the machine via a rod-shaped fixing member 4 whose one end is screwed through a joint screwed onto a bolt 244 protruding from its surface, and the other end is screwed onto the machine frame 3. The position is fixed to frame 3. The proximity between the heat insulating lid 2 and the rotating cylinder 1 adjacent thereto is precisely adjusted by the joint.

A strip-shaped circumferential groove 120 extending in the circumferential direction is carved in the operation side surface of the outer circumference 14 of the rotary cylinder 1, and a circumferential groove 120 extending in the circumferential direction has a comb-shaped axial cross section in the driving side surface of the outer circumference 14. 120 is engraved on the rim portion 246 of the split assembly frame 24 of the heat insulating lid 2, which is placed close to the operating side outer peripheral portion 14 of the rotary cylinder 1.
An annular L-shaped member 50 is attached, which is formed by connecting a pair of semi-annular members to each other at their ends, and a side surface of the L-shaped member 50 that closely faces the circumferential groove 120 of the rotary cylinder 1 has bristles. is in sliding contact with the circumferential groove 120.
The brush sealing member 5 in which wear-resistant fine bristles f are closely planted in the circumferential direction seals the space between the rotary cylinder 1 and the operation-side heat insulating lid 2 adjacent thereto in the circumferential direction, and One end is closely fixed to the boss portion 248 of the split assembly frame 24 of the operating side heat insulating lid 2, and the other end is tightly fixed to the axle box 300 of the bearing 30. Pipe member 52
The connection between the rotary cylinder 1 and the operation-side insulating lid 2 adjacent thereto is established by a tubular sealing member 5 formed by closely connecting the longitudinal split ends to each other so as to enclose the shaft neck 16 of the rotary cylinder 1. When sealed, an airtight heat insulating chamber 6 is formed between the rotary cylinder 1 and the operating side heat insulating lid 2. On the other hand, on the side of the split assembly frame 24 of the heat insulating lid 2 which is close to and faces the side surface of the driving side outer circumferential portion 14 of the rotary cylinder 1, fin members each having a cutting edge inserted into a circumferential groove 120 facing each other are provided. The labyrinth sealing member 5, which is formed by a labyrinth sealing member 5 extending in the circumferential direction and protruding in an annular shape, seals the space between the rotary cylinder 1 and the drive side heat insulation lid 2 adjacent thereto in the circumferential direction, and also provides drive side heat insulation. The inner circumferential surface of the boss portion 248 of the divided assembly frame 24 of the lid 2 and the shaft neck 1 of the rotary cylinder 1 that is opposed to the inner circumferential surface of the boss portion 248 of the divided assembly frame 24 of the lid 2
The shaft sealing member 5 consisting of a journal bearing sealing member 56 provided between the outer peripheral surface of the rotary cylinder 1 and the inner peripheral part of the drive-side heat insulating lid 2 adjacent thereto in the circumferential direction. An airtight heat insulating chamber 6 is formed between the rotary cylinder 1 and the drive side heat insulating lid 2 by being sealed.

〔effect〕

In other words, in the paper material drying cylinder according to the present invention, since the heat insulating lid that covers the entire heat dissipating surface of the end plate of the rotary cylinder does not rotate at high speed together with the rotary cylinder, the thickness of the heat insulating board, mat, etc. that maximizes the heat insulation effect, Not only can the density be arbitrarily determined, but the heat insulating lid has a simple structure and can be manufactured at an extremely low cost because it is not subjected to the strong centrifugal force caused by the high-speed rotation of the rotating cylinder. Since the rotating tube and the heat insulating lid are completely insulated in this way, there is no need for any attachment or joining jig to attach or attach the heat insulating cover to the rotating tube, and the rotating tube is not required for attaching or attaching the heat insulating cover to the rotating tube. There is no need to process the cylinder. Therefore, it is extremely easy and inexpensive to apply the present invention to existing rotary cylinders that are often used in paper drying equipment, etc., and it is safe and does not interfere with the work of the operator.

Furthermore, during operation, equipment damage, personal injury, or papermaking may occur due to parts such as mounting jigs flying off the insulation lid and rotating tube, or dirt such as paper powder adhering to the insulation lid flying around. No staining or damage to the product occurs.

In addition, there is either no sliding contact between the insulating lid and the rotary cylinder, or there is only an inexpensive and easy-to-replace gasket such as a brush, and it is possible to select a material with extremely low wear and tear for the gasket. The lifespan is extremely long. Furthermore, the heat insulating materials such as glass fiber cotton and heat insulating foamed synthetic resin pieces in the heat insulating lid do not shift at all during operation, and the best and most stable heat insulating effect can be permanently demonstrated at all times.

As described above, the paper material drying cylinder according to the present invention not only has excellent heat insulation properties as described above, but also has safety and
It has many superior effects compared to conventional technology in terms of stability, workability, and economy.
Its utility value in the paper and pulp business field is extremely high.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a paper material drying cylinder according to the present invention. [Explanation of symbols], 1... Rotating cylinder, 10... End plate,
16...Shaft neck, 2...Insulating lid, 20...Outer periphery,
22...Inner peripheral part, 3...Machine frame, 4...Fixing member,
5... Sealing member, 6... Heat insulation chamber, p... Wet paper making material.

Claims (1)

[Claims] 1. In an internally heated drying cylinder in which wet papermaking material is engaged and heated to dry, the outer periphery is brought close to the rotating cylinder so as to cover the entire heat dissipation surface of the end plate of the rotating cylinder, and the inner periphery is placed close to the rotating cylinder. An annular heat insulating cover fitted onto the shaft neck of the cylinder is fixed in position via a fixing member to the machine frame supporting the rotary cylinder, and there is a gap between the rotary cylinder and the outer and inner circumferences of the heat insulating cover. A papermaking material drying cylinder, characterized in that the rotary cylinder is circumferentially sealed by a sealing member to form an airtight heat-insulating chamber between the rotary cylinder and the heat-insulating lid.