JPH03152017A - Belt cleaner - Google Patents

Abstract

PURPOSE:To improve wear resistance, corrosion resistance, and strength of bonding to a metallic base sheet by a method wherein, in a cleaner for a belt for conveying cokes, cermet is soldered to the metallic base sheet to form a cleaner member. CONSTITUTION:A belt cleaner is formed such that cermet is joined as a cleaner member 9 to a base sheet 10, e.g. stainless, by soldering. The cermet is prepared such that rigid particles with a grain size of 1.5-15mum containing carbide and/or nitride are mixed in powder of an iron group metal and a chrome metal to sintere the mixture. This constitution improves the length of a resisting period.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a belt cleaner, and more particularly to a belt cleaner for scraping off deposits on a heald conveyor for transporting coke, iron ore, and the like.

(Prior Art) Belt conveyors are often used as a means of transporting coke, iron ore, etc. in steel plants and the like. During use of such a belt conveyor, iI! If Il substances adhere to the container and are left unattended, transportation will be hindered, so the adhered substances are removed. The removal is carried out by a belt cleaner while operating the belt conveyor, as shown in Figure 1.
This is done by scraping off objects. In Figure 1, (5) is the belt, (4) is the belt roller, (6)
indicates the conveyed object, (7) indicates the deposit, (1) and (2) indicate the belt cleaner, and (8) indicates the deposit that has been scraped off. Note that only the negative part of the transported object (6) is shown, and CII
) OZ is a line to indicate the area where the transported object exists,
A conveyed object moves between line (11) and line 02). The cleaner (1) is said to be a return type, and the cleaner (2) is said to be a head type. These are used in conjunction with support means (3).

FIG. 2 shows a perspective view of the head type cleaner (2), and FIG. 3 shows a perspective view of the return type cleaner (1). As shown in these figures, each belt cleaner consists of a metal substrate OI, and a cleaner member (9) joined to the substrate 0ω.

Conventionally, metal plates such as steel and stainless steel have been used as the metal substrate, but since the cleaner member needs to have excellent wear resistance, special steel or carbide has been used. There is.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional belt cleaner, the special steel or carbide of the cleaner member does not have sufficient wear resistance, and corrosion occurs and adds to the wear, so the amount of wear is low. (Therefore, there is a problem that it needs to be replaced frequently. In particular, return type cleaners scrape off stubborn deposits that could not be scraped off by head type cleaners, so there is a serious problem that the amount of wear is extremely high. Furthermore, when the cleaner member is made of carbide, there is another problem that the belt cleaner is not easy to handle because the specific gravity of the carbide is large.

In recent years, in order to solve these problems, attempts have been made to use ceramics with excellent wear resistance and corrosion resistance as cleaner members. However, in this case, there are problems with the bonding method and bonding strength between the metal substrate and the ceramic.For example, when bonding is done with adhesive, the bonding strength decreases due to natural deterioration of the adhesive, There is a problem that the service life of the product is shortened. Also, in order to improve this,
Japanese Patent Publication No. 1-15445 proposes a method of metallizing ceramics, bringing the metallized surface into a molten state, and joining it to a preheated metal substrate. According to this method, the service life is longer than when bonding with the above-mentioned adhesive, but the bond strength between the metal substrate and the ceramic is weak, and the ceramic is likely to peel off during use, resulting in a longer service life. The problem is that it is short and insufficient.

The present invention has been made in view of these circumstances, and its purpose is to solve the above-mentioned problems of the conventional cleaner members, to provide cleaner members with excellent wear resistance and corrosion resistance, and to provide cleaner members with superior wear resistance and corrosion resistance. The purpose of the present invention is to provide a heald cleaner that can increase the bonding strength with the substrate and has a long service life.

(Means for Solving the Problems) In order to achieve the above object, a belt cleaner according to the present invention has the following configuration.

That is, the belt cleaner according to claim 1 is a belt cleaner having a metal substrate and a cleaner member joined to the substrate, and wherein the cleaner member is made of cermet.

The method according to claim 2 provides the belt cleaner according to claim 1, wherein the hard particles of the cermet have a diameter of 1.5 to 15 μm.

The method according to claim 3 provides the belt cleaner according to claim 1, wherein the cermet is brazed to the substrate.

(Function) As explained above, the belt cleaner according to the present invention has the following features:
A belt cleaner comprising a metal substrate and a cleaner member joined to the substrate, the cleaner member being made of cermet. That is, cermet is used as the cleaner member.

The above-mentioned cermet is a sintered body obtained by mixing hard particles containing carbides and/or nitrides with iron group metal and chromium group metal powders for bonding the particles, and sintering the mixed powder. be. The main component of the sintered body is the above-mentioned hard particles, and microscopically it consists of a hard phase formed by the hard particles and a bonding metal for the hard phase.Normally, the sintered body is processed into a product shape. However, after sintering, the product may be processed after being further pressurized using a hot isostatic pressure device.

In this way, since cermets have a hard phase consisting of carbides and/or nitrides bonded with a bonding metal,
It has high hardness and high toughness, and therefore has extremely excellent wear resistance. In addition, it has much better corrosion resistance than conventional cleaner members made of special steel or carbide. In addition, since cermet contains a metal component, it has good brazing properties with metal (relatively strong bonding strength can be obtained by brazing bonding). When used for cleaning, wear and corrosion of the cleaner members is less likely to occur, and therefore the amount of wear can be significantly reduced.
Furthermore, the bonding strength with the metal substrate can be increased, resulting in a longer service life.

The belt cleaner according to the present invention uses cermet as the cleaner member as described in @.

Therefore, the cleaner member has excellent wear resistance and corrosion resistance, and can increase the bonding strength with the metal substrate, resulting in a longer service life.

Furthermore, since the specific gravity of the cermet can be made 7.5 or less, the weight of the belt cleaner can be reduced and its handling can be made easier.

In the belt cleaner according to the present invention, the cermet of the cleaner member is not limited, but it is desirable that the diameter of the hard particles, which is the main component, is 1.5 to 15 μl. By doing so, the toughness of the cermet is further improved, and therefore, the wear resistance is further improved, and the propagation of cracks is more easily inhibited, so that the life of the cermet is increased accordingly.

Preferably, the cermet is brazed to the substrate. If the joint is brazed, as mentioned above (
This is because the bonding strength between the cermet and the substrate is reliably increased, and the life span is increased accordingly. Further, it is also possible to join by screwing, and strong joint strength can be obtained.

Note that if the bonding strength may be a little low, fitting bonding may be used.

Although the composition of the cermet is not limited,
By doing the following, it is possible to ensure that the cleaner member has excellent wear resistance and corrosion resistance. ! 11th, Tic: 5-60wtχ, WC: 1-50wt'1
, Mo, C, TaC, VC, Cr5Ct, NbC,
Cermet containing one or two types of ZrC, HfC (hereinafter referred to as Ao2c, etc.): 1 to 25wtχ, Ni + one or two types of Co (hereinafter referred to as Ni, etc.) = 5 to 40wtX, or in addition to these Furthermore, TiN: 30wt%
It is recommended to use a cermet containing the following, Tic: 5-6
Compared to the case of 0wtχ, Tic: 14 when less than 5wtχ
FJ abrasion resistance decreases, and if Tic: exceeds 60wtχ, toughness decreases. WC: -〇21 compared to the case of 1 to 50-1χ
If it is less than -tχ, the toughness decreases, and if it exceeds WC:50wtχ, the wear resistance decreases. Regarding the influence of these components, M
otC, etc.: Compared to the case of 1 to 25wtX, MozC, etc.:
If it is less than 1-tχ, the wear resistance decreases, and Mo2C etc.: 25
When wtχ exceeds, there is a tendency for toughness to decrease. Regarding Ni etc., compared to the case of Ni etc.: 5~4Qwtχ, Ni etc.
etc.: If it is less than 5-tχ, the toughness decreases, and Ni etc.: 40@
If it exceeds L'f, the wear resistance tends to decrease.

Including TiN further improves wear resistance, but TiN:
If it exceeds 30wtχ, the toughness tends to decrease. Therefore, the composition of the cermet may be determined by taking into consideration the influence of the above-mentioned components and the required degree of properties such as wear resistance and toughness.

Note that, from a material standpoint, the belt cleaner according to the present invention is a composite material made of a metal substrate and a cermet bonded together. Since the composite material having such a structure has excellent abrasion resistance and corrosion resistance of the cermet part, it can be suitably used not only as a belt cleaner but also as a component of equipment that requires excellent abrasion resistance and corrosion resistance. In addition, unlike ceramics, cermet has good electrical conductivity, so composite materials with such a structure can be suitably used as parts of electrical equipment such as sliding contacts that require excellent wear resistance and electrical conductivity. .

(Example) Examples of the present invention will be described below.

1 Difference JLL A return-type helt cleaner similar to that shown in FIG. 3 was made by brazing and joining a cermet as a cleaner member to a metal substrate (stainless steel). The following three types of cermets were used as the above-mentioned cermets. That is, ■Ti
N: 18 division tχ-MO□C: 20 crocodile tχWC: 5wtχ
-Ni:15wtχ-TiC (: balance) composition (
Cermet A), ■TiN: 18wtχ-MozC: 2
3wt$-WC: 2wtχ-TaC: 6wL%-Ni:
12wtX-Co:4wtX-TiC (remainder) composition (Cermet B), ■MO□C:4wtχ-W
C:12-tχ-TaC:3.5wtX-Ni:10w
A cermet C having a composition of tχ-Co:10wtχ-Tic (remainder) was used.

10) The belt cleaner is coupled to a supporting means, and while the belt conveyor is operated, the belt cleaner scrapes off the deposits on the belt at 1 r/day for 30 days, that is, 3
It was carried out intermittently for 00 hours. At this time, the running speed of the belt was 200 s+/in, and the pressing force of the belt cleaner against the belt was 8 gf/100 mm.

As a result, during the above 300 hours, there were no abnormalities such as peeling of the cleaner member, and the amount of wear of the cleaner member was 0.42 m5 when the cleaner member was attached to cermet.
/300Hr, 0.66+sm/ in case of cermet B
300Hr, 0.9ha/300 in case of Cermet C
It was Hr. All of these are smaller than the amount of wear of the cleaner member (carbide) of the comparative example described later.

When the hardness and transverse rupture strength of Cermets A, B and C were measured, the hardness (hA) was 91.5, 92.
5 and 92.0, and the transverse rupture strength is 180.185 and 1
90Kgf/ms".

Furthermore, for the belt cleaner before and after the deposit scraping test, the joint strength of the brazed joint was measured and the joint state was microscopically observed. As a result, the bonding strength of cermets A, B, and C before the scraping test was 15.2.14.8+16.7Kgf/am in terms of shear strength.
”, and the bond strength after the test was 15.1, 14.8.1
gf/v++'' of 6.6, and no deterioration in bonding strength or bonding condition was observed after scraping off deposits for 300 hours.In addition, there was no difference in microscopic observation before and after the test, and both were in a healthy bonding condition. This was confirmed.

A return type cleaner similar to that in Example 1 was made by brazing and joining carbide as a cleaner member to a soil metal substrate (stainless steel M). The following three types of carbide were used as the above-mentioned carbide. That is, (a) CrzCz:1ivtχMo2C:
1wtX-Ni:8wtχ-W(:(:Remainder) (carbide a), (b) Ni:htX-WC(:
The remainder) has the composition (carbide b), (C) Co:6
A material (carbide C) having a composition of wtχ-WC (,: remainder) was used.

Example 1
Scrape off the deposits in the same manner as above.

As a result, the wear amount of the cleaner member of the above cleaner is 1.25 m11/300 when the cleaner member is made of carbide a.
The Hr was 1.13 mm/300 Hr in the case of carbide, and 1.97 m5/300 Hr in the case of carbide C.

The hardness (HIIA) of the carbides a, b, and c is 90.0.89.5.91.0, and the transverse rupture strength is 166.
, 220° gf/ms”te was at 220°.

(Effects of the Invention) In the belt cleaner according to the present invention, the cleaner member joined to the metal i-plate has excellent wear resistance and corrosion resistance,
Moreover, it can have high joint strength and therefore has excellent durability as a belt cleaner. Therefore, if this is used to scrape off deposits on a belt conveyor, there is no need to frequently replace the belt cleaner, and the deposits can be scraped off stably over a long period of time.

It should be noted that a composite material made of a metal substrate and a cermet bonded together, such as the belt cleaner according to the present invention, can be used as a component for famous equipment that requires wear resistance and corrosion resistance, or as a sliding material that requires wear resistance and electrical conductivity. It can also be used as an electrical equipment member such as a moving contact, and in this way the durability of the equipment member can be improved.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing how a belt cleaner scrapes off deposits on a belt, FIG. 2 is a perspective view of a head type cleaner, and FIG. 3 is a perspective view of a return type cleaner. (1) - Return type cleaner (2) - Head type cleaner (3) - Support means (4)
- Belt roller (5) - Belt (6) - Transported object
(7) - Deposits (8) - Deposits scraped off

Claims (3)

[Claims] (1) A belt cleaner comprising a metal substrate and a cleaner member joined to the substrate, wherein the cleaner member is made of cermet. (2) The diameter of the hard particles of the cermet is 1.5 to 15μ
The belt cleaner according to claim 1, wherein the belt cleaner is m. (3) The belt cleaner according to claim 1, wherein the cermet is brazed to the substrate.