JPH1035844A - Conveyor belt and its manufacturing method - Google Patents

Abstract

(57) Abstract: In a sintering furnace, a conveyor belt including a belt part having heat-resistant steel as a base and a number of ceramic wear-resistant chips exposed and held on the upper surface side of the belt part is provided. Make sure that the wear-resistant chip does not easily fall off even at high temperatures. A belt component (1) having heat-resistant steel as a base and a large number of ceramic wear-resistant tips (2) exposed and held on the upper surface side of the belt component, wherein the ceramic wear-resistant tip (3) is a ceramic porous body (3). Installed on belt parts via The ceramic wear tip is fired at a high temperature together with the ceramic porous body, and the integrated body is attached to the belt component in such a manner as to be exposed on the upper surface of the belt component by further integrating the same.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveyor belt which is used in a high temperature state such as a sintering furnace and is connected to strip-shaped plates in an endless state.

[0002]

2. Description of the Related Art In order to improve abrasion resistance and heat resistance, a conveyor belt having a large number of ceramic chips attached to a surface layer thereof has been developed and used as disclosed in JP-A-61-2606. I have. This conveyor belt cannot be used in a high temperature state because rubber is used for the belt body. However, in a high temperature state, a conveyor belt having a structure in which strip-shaped belt parts 1 are connected to each other as shown in FIG. 2 is generally used. Can be In FIG. 2, the belt component 1 is made of heat-resistant steel such as Ni-Cr steel as a base. As the material of the wear-resistant tip 2, silica, alumina, or the like is used. As the adhesive, a silicon-based adhesive having heat resistance and flexibility is used. The temperature at which the decomposition of the silicon-based adhesive starts is 500 to 600 ° C. in an inert gas and about 300 ° C. in the atmosphere.

[0003]

However, in this type of conventional conveyor belt, a belt component 1 and a wear-resistant chip 2 are provided.
Since a silicon-based adhesive is used as the adhesive 4 for connecting the components, it depends on the material and size of the wear-resistant chip and belt parts, but in a high temperature state of 1000 ° C. or more in an inert gas such as a sintering furnace. When used for more than one year, the adhesive decomposes and the wear-resistant chips fall off.

In the case of a conveyor belt in which a belt component is metal and a ceramic wear-resistant chip is directly attached to the belt component by diffusion bonding or the like, a crack is generated at a joint due to a difference in thermal expansion coefficient between the belt component and the wear-resistant chip. The wear-resistant chip disposed on the surface may fall off.

[0005] It is an object of the present invention to provide a conveyor belt in which wear-resistant chips are less likely to fall off at a high temperature such as in a sintering furnace.

[0006]

In order to solve the above-mentioned problems, a conveyor belt according to the present invention comprises a belt component having heat-resistant steel as a base, and a large number of ceramic belts exposed and held on the upper surface side of the belt component. The ceramic wear-resistant tip is mounted on the belt component via the ceramic porous body.

[0007] A belt component, which is a component of the conveyor belt of the present invention, is composed of a heat-resistant steel such as Ni-Cr steel as a base.

The ceramic wear-resistant chip, which is another component of the conveyor belt of the present invention, is fired at a high temperature together with a porous ceramic body, and the integrated one is further integrated with the belt part by a method of integrating the two. It is mounted so that it is exposed on the top.

Here, the expression that the wear-resistant chip is exposed on the upper surface side means that the wear-resistant chip can be seen from the upper surface side of the belt component. Accordingly, the upper surface of the wear-resistant tip may be substantially flush with the upper surface of the belt component, or may be located above the upper surface of the belt component, but is preferably above the belt component. .

The wear-resistant tip may have a square shape, a cylindrical shape, or another shape in addition to the spherical shape illustrated in FIG.

As the material of the wear-resistant tip, generally used ceramics can be used. For example, alumina,
Structural ceramics such as silicon nitride can be used. However, when used at high temperatures, it is desirable to use silicon carbide which has heat resistance and hot strength and is also excellent in spalling resistance. Only one kind of wear-resistant tip may be used, or two or more wear-resistant tips may be combined.

The ceramic wear-resistant tip according to the present invention is mounted on a heat-resistant steel belt component via a ceramic porous body. Therefore, it is less likely to fall off at a high temperature than in the case of the related art in which a silicon-based adhesive is used as an adhesive connecting the belt component and the wear-resistant chip.

When a wear-resistant chip is directly mounted on a belt component, the strain tends to come off due to the occurrence of thermal strain. In the present invention, however, the difference in the coefficient of thermal expansion between the belt component and the wear-resistant chip is caused by the ceramic porous body. This worry has been eliminated because of the relaxation of

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 (a) shows a part of the upper surface of a conveyor belt which is an example of the present invention, and FIG. 1 (b) is a sectional view taken along the line AA of FIG. 1 (a). This conveyor belt is
It is composed of a belt-shaped belt component 1, a ceramic wear-resistant tip 2, and a ceramic porous body 3. The wear-resistant tip 2 of this example is a ceramic porous body 3 (t10 mm ×
Belt parts (t20mm) through W185mm × L65mm
.Times.W185 mm.times.L65 mm). The wear-resistant tip 2 is made of alumina and has a spherical shape of φ20 mm. Porous ceramic material has a porosity of about 80%, material:
Alumina, a felt-like material having an average fiber thickness of 0.5 mm was used.

The manufacturing method is as follows. After the wear-resistant chips 2 are arranged at predetermined positions on the thin ceramic porous body 3 and both are fired, the integrated ceramic fired body is set in a mold and the molten metal of the belt part is melted. Was poured from the side without the wear-resistant tip.

Hereinafter, an example of a method for manufacturing a conveyor belt according to the present invention will be described with reference to the drawings.

FIG. 3A is an explanatory plan view showing an example of a ceramic porous body used directly in the practice of the present invention.
FIG. 3B is an explanatory sectional view taken along the line BB of FIG.

The ceramic porous body 3 has a wear-resistant chip alignment mold 5 (t9 mm × W185 mm × L65).
mm) and the other 6 (t3 mm × W185 mm × L65 mm) are stacked. After or while placing a number of wear-resistant chips 2 on the surface of the wear-resistant chip alignment mold, the ceramic porous body 3 is vibrated by appropriate means into each of the recesses 7 arranged at intervals. Each wear-resistant tip 2 is accommodated.

Thereafter, the wear-resistant tip 2 and the ceramic porous body 3 are fired in the atmosphere at an atmospheric temperature of 1600 ° C. for 30 minutes to form a fired ceramic body 8 shown in FIG.

Subsequently, as shown in FIG. 5, the ceramic fired body 8 is set in a cavity of a mold 9 and molten metal (temperature: 1550 ° C., chemical components: Ni 18%, Cr 5%, S
i5%, structure: austenite + graphite) was injected and allowed to cool, and then a cast product (t30 mm × W185 mm × L65 mm) was taken out. Deburring the casting to obtain a belt component 1. It is desirable to heat the ceramic fired body 8 and the mold 9 to 1000 to 1200 ° C. in order to reduce the thermal shock at the time of pouring.

By connecting the belt parts 1 to each other, the conveyor belt of the present invention is obtained.

When this belt was cut in cross section, as shown in FIG. 6, the belt component 1, the wear-resistant chip 2, the ceramic porous body 3, and the intermediate layer 10 (the metal poured into the ceramic porous body) entered therein. (Thickness: 3 mm).

[0023]

The wear-resistant ceramic tip according to the present invention is mounted on a heat-resistant steel belt part via a ceramic porous body. Therefore, the wear-resistant chip is less likely to fall off at a high temperature than in the case of the related art in which a silicon-based adhesive is used as the adhesive connecting the belt component and the wear-resistant chip.

When the wear-resistant chip is directly installed on the belt component by diffusion bonding, the wear-resistant chip is liable to fall off due to expansion and cooling contraction at the time of temperature rise.

In this regard, in the present invention, the wear-resistant chip is less likely to fall off because the porous ceramic body reduces the difference in the coefficient of thermal expansion between the belt component and the wear-resistant chip.

After use for 2,000 hours in a reducing atmosphere at a temperature of 1200 ° C., 32% of the wear-resistant chips fall off in the prior art using a silicon-based adhesive and 21% in the case of direct installation by diffusion bonding. On the other hand, it was 0% in the conveyor belt of the present invention.

[Brief description of the drawings]

FIGS. 1A and 1B show an example of a conveyor belt according to the present invention, wherein FIG.
FIG. 4 is an explanatory cross-sectional view taken along the line AA of FIG.

FIG. 2 is a sectional view of an adhesive structure between a belt component and a wear-resistant chip in a conventional conveyor belt.

FIGS. 3A and 3B show an example of a mold for aligning wear-resistant chips of a porous ceramic body used directly in a conveyor belt according to the present invention, wherein FIG. 3A is a plan view and FIG.
FIG. 3A is an explanatory sectional view taken along the line BB in FIG.

FIG. 4 is a sectional view of a fired ceramic body.

FIG. 5 is a sectional view of a mold in which a ceramic fired body is set in a cavity.

FIG. 6 is a sectional view of a conveyor belt according to the present invention.

[Explanation of symbols]

1 is a belt component, 2 is a wear-resistant chip, 3 is a ceramic porous body, 4 is an adhesive, 5 is a ceramic porous body 1 (with a wear-resistant chip alignment mold), and 6 is a ceramic porous body 2 (for wear-resistant chip alignment). No mold), 7 is a mold recess for aligning wear-resistant chips, 8 is a ceramic fired body,
9 is a mold and 10 is an intermediate layer.

Claims (2)

[Claims] 1. A conveyor belt in which a large number of ceramic wear-resistant chips are exposed and held on the upper surface side of a belt component made of heat-resistant steel, wherein the ceramic wear-resistant chips are connected to the belt component via a ceramic porous body. A conveyor belt disposed on an upper surface side, wherein the ceramic wear-resistant chip and the ceramic porous body are fixed, and the ceramic porous body and the belt component are fixed. 2. A method of manufacturing a conveyor belt in which a number of ceramic wear-resistant chips are exposed and held on the upper surface side of a belt component made of heat-resistant steel, wherein the wear-resistant chips are formed on a thin ceramic porous body. A method for manufacturing a conveyor belt, comprising arranging and firing both at predetermined positions, setting an integrated ceramic fired body in a mold, and pouring the melt.