JPH1130228A - Roller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a roller conveyable in a low noise by installing a lining layer by means of a high polymer viscoelastic material on the inner circumferential surface of a drum outer hull, further laminating it on the inner circumferential surface of this lining layer, and also installing an inner surface layer by means of a material being larger in acoustic impedance than the high polymer viscoelastic material. SOLUTION: A lining layer 2 by means of a high polymer viscoelastic material is installed on an inner circumferential surface of a metal drum outer hull 1, and further it is laminated on an inner circumferential surface of the lining layer 2 and an inner surface layer 3 by means of a material being large in acoustic impedance is installed. Here, a vibration produced by conveyance or the like of a hard member is propagated to the lining layer 2 consisting of the high polymer viscoelastic material as an elastic wave, and thereby in the layer, the vibration is absorbed into wane owing to viscoelasticity of the lining layer 2 as repeating the reflection in space between interfaces (a boundary surface 4 with the drum outer hull as well as a boundary surface 5 with the inner surface layer) at both sides consisting of coming into contact with a layer being larger in the acoustic impedance than the layer, and thus any possible noises is held down to lowness. In this connection, the lining layer is 3 to 15 N/cm<2> or so in compressive hardness, and thickness of the inner surface layer should be set to a range of 30 to 1000 μm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller which can be operated with low noise for conveying, guiding, supporting or holding a hard member such as a metal plate.

[0002]

2. Description of the Related Art Rollers having a rubber lining on the outer peripheral surface of their body have been frequently used as rollers for the above applications unless the temperature of a member to be conveyed or the like is high. This is because the rubber lining significantly reduces noise during operation. Recently, in order to reduce equipment maintenance costs, it has been required to omit the external rubber lining that requires renewal.However, noise at the time of operation becomes a problem, so a noise prevention measure that replaces the external rubber lining is needed. Had become.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to meet the above-mentioned needs, and an object of the present invention is to provide a roller which can be operated with low noise without arranging an outer surface with a rubber lining. I do.

[0004]

As shown in FIG. 1, the roller according to the present invention, which has been made to solve the above-mentioned problems, comprises a metal viscoelastic material on the inner peripheral surface of a metallic shell 1. And an inner surface layer 3 made of a material having an acoustic impedance larger than that of the polymer viscoelastic material and laminated on the inner peripheral surface of the backing layer 2. . Here, a polymer viscoelastic material is a rubber or resin having deformation characteristics in which elastic deformation and viscous flow are mixed. Refers to what happens.
The acoustic impedance refers to the product ρc of the density ρ of the medium and the speed of sound c in the medium. Then c ≒ √
(E / ρ) (E is Young's modulus).
Since (ρ · E), the acoustic impedance increases as ρE increases, that is, as the specific gravity increases and as the rigidity increases.

According to the above construction, the vibration generated by the transportation of the hard member or the like propagates as an elastic wave to the backing layer 2 made of a polymer viscoelastic material, and a layer having a larger acoustic impedance than the layer in the layer. While being repeatedly reflected between the boundary surfaces on both sides (boundary surface 4 with the body shell and boundary surface 5 with the inner surface layer) formed in contact with, it is absorbed by the viscoelasticity of the backing layer and decays, Is suppressed to a low level, thereby solving the problem of the present invention.

In the roller of the present invention, as the acoustic impedance of the backing layer is smaller than that of the inner surface layer, the reflectance of the elastic wave at the boundary surface becomes larger. Therefore, it is desirable to form the backing layer as soft as possible, and thus a material having a small acoustic impedance, and it can be said that the backing layer is sufficiently softer than a normal resin material of a kind used by molding, and has a compression hardness of 15 N / cm ² or less. It is desirable to use the above material. Incidentally, the compression hardness is usually applied to extremely soft materials such as polyethylene foam, JISK6767-
According to the measurement method described in Section 5.3. Regarding the thickness of the backing layer, the thickness of the shell
It is a measure to provide a practically significant level of vibration absorption.

[0007] The softer the material, the more the backing layer
Also, as the thickness increases, the absorption of vibration increases, but 3N /
Even if the compression hardness is less than cm ² or the thickness is more than twice as large as the shell of the body, the effect is not increased as the handling becomes difficult and the cost is greatly increased. An excellent polymer viscoelastic material in the vibration absorbability, also in terms of hardness 3~15N / cm ² about things easily obtained compression, even if the rubber butadiene is, the backing layer of the present invention the rollers Recommended as a suitable material.

Next, as for the inner surface layer, the higher the acoustic impedance is, the higher the reflectivity is. Therefore, the higher the hardness and the specific gravity of the material are, the better the inner surface layer is. As the roller is supported by the layer and rotates with the rotation of the roller, a material having a large specific gravity, such as a steel material, has a large inertia rate and may cause whirling. Therefore, a lightweight and hard material such as a hard resin or an aluminum alloy is suitable. Examples of the hard resin material include polyester, hard vinyl chloride resin, acrylic resin, and resins reinforced with carbon fiber or glass fiber.

Regarding the thickness of the inner surface layer, if it is too thin or too thick, there is a difficulty in manufacturing, and it is preferable that the thickness of the inner surface layer is negligible, so that it depends on the characteristics of the material. 30-10
It is good to set it in the range of 00 μm.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is directed to a roller having a body rotating about a fixed shaft, and a journal having a body attached to both ends thereof, regardless of whether the roller is a driven roller or a non-driven roller. Any roller that rotates with respect to the bearing together with the roller is applicable as long as it is a hollow roller.

In each case, the shaft, bearing,
The backing layer and the inner surface layer are applied to the trunk outer shell without the journal or the like. The backing layer is applied by appropriately using a reaction hardening method, a melt-solidification method, a powder fusion method, a sheet sticking method, or the like, depending on the suitability of the polymer viscoelastic material to be used or the thickness of the applied material. be able to. Further, the lamination with the inner surface layer may be performed by forming a layer of a resin or an aluminum alloy on the inner peripheral surface by forming a layer of a resin or an aluminum alloy after forming a backing layer, or a resin or an aluminum alloy. The cylindrical body may be arranged coaxially in the body shell, and the backing layer may be cast into a cavity formed between the cylindrical body and the inner peripheral surface of the body shell.

The roller of the present invention, in which noise is less likely to be generated as described above, may be used with the outer peripheral surface of the body shell being bare, but the present invention is directed to reducing the maintenance load. Therefore, it is desirable that the outer peripheral surface is subjected to a surface modification treatment for improving abrasion resistance to extend the service life. The surface modification treatment includes quenching,
Examples include chromium plating and thermal spraying. Ni-Cr based alloy, Co
Thermal spray coating of a cermet, in which a base phase of a base alloy or the like is filled with ultra-hard particles such as carbides and borides, is particularly recommended because it has at least 10 times the wear resistance of hardened steel.

The cermet thermal spray coating is preferably applied to a thickness of about 50 to 200 μm from the viewpoint of a balance between service life and toughness. The roller of the present invention having a cermet spray-coated on its outer surface can be used as a substantially maintenance-free low-noise roller if it is used for transportation.

[0014]

As described above, the roller of the present invention is a roller having a hollow body used for conveyance and the like, in which a backing layer made of a polymer viscoelastic material is provided on the inner peripheral surface of the body outer shell. Further, the configuration in which the inner surface layer of a material having a higher acoustic impedance than the polymer viscoelastic material is laminated on the inner peripheral surface of the backing layer to provide a low noise without applying a rubber lining to the outer peripheral surface of the trunk portion. It is possible to carry it.

The provision of the roller of the present invention makes it possible to omit the external rubber lining, which may require renewal within a few months at the earliest. Furthermore, by performing a treatment for improving abrasion resistance, such as thermal spray coating of carbide cermet, on the outer peripheral surface of the body of the roller of the present invention, it is possible to omit maintenance even for applications in which the outer peripheral surface is greatly worn. Become.

Generally, the roller is often a major cost factor in the maintenance of the line equipment, and the line stop for replacing the roller is also a major factor in reducing the production efficiency. Such problems can be greatly improved, and the contribution to the industrial world is great.

[Brief description of the drawings]

FIG. 1 shows a cross-sectional configuration of a roller body of the present invention.

[Explanation of symbols]

 1 outer shell 2 backing layer 3 inner surface layer

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masanori Morinaga 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Inside the Kobe Steel Works Kakogawa Works (72) Inventor Kenji Sato 1 Kanazawacho, Kakogawa City, Hyogo Prefecture Kobe Steel, Ltd.Kakogawa Works (72) Inventor Ryoji Kobayashi 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa Pref. 2-17-8 Tonomachi, Kawasaki-ku Daiichi High Frequency Industry Co., Ltd. (72) Inventor Chihiro Sakizaki 2-17-8 Tonomachi, Kawasaki-ku, Kawasaki-ku, Kanagawa Prefecture Daiichi High Frequency Industry Co., Ltd. (72) Invention Person Nobukuni Ishibashi 21-4 Minami Futami, Futami-cho, Akashi-shi, Hyogo In the Kansai Works of Daiichi High Frequency Industry Co., Ltd.

Claims (5)

[Claims] 1. A backing layer made of a polymer viscoelastic material is provided on the inner peripheral surface of a metal body outer shell, and is further laminated on the inner peripheral surface of the backing layer so as to be higher than the polymer viscoelastic material. A roller provided with an inner surface layer made of a material having high acoustic impedance. 2. The method according to claim 1, wherein the backing layer has a compression hardness of 3 to 15 N / cm ^2.
The polymer viscoelastic material is formed to a thickness of 0.5 to 2 times the thickness of the outer shell of the trunk, and the inner surface layer is formed to a thickness of 30 to 1000 μm by a resin or an aluminum alloy. 2. The roller according to 1. 3. The roller according to claim 1, wherein the polymer viscoelastic material is a butadiene rubber. 4. The roller according to claim 1, wherein an outer peripheral surface of the body outer shell is subjected to a surface modification treatment for improving abrasion resistance. 5. The roller according to claim 4, wherein the surface modification treatment is thermal spray coating with a cermet material.