JPH0760013A - Abrasion-resistant shoe of sewage treatment machine - Google Patents

Abstract

PURPOSE:To improve the service life of a shoe subjected to severe abrasion by making the shoe of a sand hoisting machine or a sludge scraping machine which is used after muddy sand treatment, of a material with superb corrosion inhibitive and abrasion-resistant properties. CONSTITUTION:In a shoe 4 used for sewage treatment machinery such as a sand hoisting machine and a sludge scraping machine, at least, a sliding surface of the shoe 4 with a rail 5 is made abrasion-resistant. Thus the abrasion- resistant and corrosion-inhibitive properties of the shoe are improved and thereby, the service life of the shoe is extended surprisingly long, so that the frequency of replacing the shoe can be significantly reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment machine such as a sand lifter, a sludge attractor, and a flight conveyor, which has excellent corrosion resistance and wear resistance on at least the rail sliding surface of the shoe sliding with the rail. The present invention relates to a wear-resistant shoe for a sewage treatment machine, which improves the wear resistance of the shoe.

[0002]

2. Description of the Related Art In the sewage treatment process, a large amount of sand particles are mixed in a treatment tank provided with a sand lifter, a flight conveyor, a sludge attractor, etc. located relatively in the first half. Then, the bucket of the sand lifter, the flight conveyor, the flight of the sludge scraper, and the like are slidably moved while supporting the load on rails laid along the longitudinal direction of the pond, and perform desired work. When these buckets, flights, etc. slide on the rails, sliding friction due to mixed sand and the like is severe.
For this reason, a shoe is attached to a sliding portion in contact with the rail so that the bucket, flight, etc. are not directly worn, and this shoe is often replaced to ensure wear resistance of the bucket, flight, etc. The material used for this shoe is generally ordinary cast iron (FC20) to spheroidal graphite cast iron (FCD60) having good wear resistance.

[0003]

In sewage containing chlorine ions, sulfate ions, sand, etc., a shoe of ordinary cast iron has insufficient corrosion resistance and wear resistance, and this shoe is often replaced due to severe wear and corrosion. It is necessary to replace this shoe, which requires a considerable amount of work. Also, as an improvement against corrosion deterioration, the shoe is made of stainless steel.
A method of applying US304 and a thin plate made of SUS304 on the rail surface has been proposed. However, even if it is excellent in corrosion resistance, it wears heavily and also wears the rail side, so it is not very effective. It is also possible to manufacture the entire shoe with ceramics, but even if it is excellent in corrosion resistance and wear resistance as a material of ceramics, it has extremely high hardness but low fracture toughness value and becomes fragile and vulnerable to impact. It cannot be used. In addition, it is difficult to process into a complicated shape and it becomes expensive.

It is an object of the present invention to improve the life of a shoe that is severely worn by using a material having excellent corrosion resistance and abrasion resistance for a shoe used after sand treatment such as a sand lifter and a sludge scraper. .

[0005]

The present invention has been made in order to achieve the above-mentioned object, and in a shoe used for a sewage treatment machine such as a sand lifter and a sludge attractor, it is made of ordinary cast iron into spherical shape as in the conventional case. A shoe is formed using materials up to graphite or stainless steel with excellent corrosion resistance, and ceramic is sprayed on the sliding surface of the shoe with the rail to integrally form a ceramic sprayed layer. The gist is to apply a sealing process to this.

[0006]

[Operation] The shoe to be installed on the sliding part of the bucket of the sand lifter and the flight of the sludge attractor is made of stainless steel or the ceramic body and synthetic resin are mixed. In addition, since ceramic is sprayed on the part of the shoe that slides in contact with the rail to provide wear resistance as a unit, corrosion resistance of the shoe in the treatment of sewage containing chlorine ions, sulfate ions, sand, etc. -The wear resistance is improved and the life of the shoe can be extended.

[0007]

The wear resistant shoes in a sewage treatment machine such as a sand lifter and a sludge attractor according to the present invention will be described below with reference to the illustrated embodiments. In the figure, A is a sand lifter installed in a sewage treatment plant. As shown in the drawing, this sand lifter A lifts endlessly along the bottom and the water surface in the longitudinal direction in the water tank 1 or the sewage treatment pond. The chain 2 of the sand machine is stretched, the buckets 3 are attached to the chain at required intervals, the buckets 3 are moved along the bottom, and the dirty sand that has settled on the bottom is taken out and scraped and discharged. is there. In this sand lifter A, when the bucket 3 slides and moves on a rail 5 laid on the bottom of a pond or a water tank, in order to prevent abrasion of the bucket, the bucket 4 has a shoe 4 on a sliding surface with the rail. Attach.

The shoe 4 may have various shapes other than the shape suitable for mounting on a bucket or the like, and the shoe 4 has mounting flanges 42, 42 integrally provided on both sides thereof. The shoe main body 41, which is thicker than the mounting flange portion, is arranged in the central portion, and is integrally formed so as to project from the mounting flange on the contact surface with the rail. The shape of this shoe body is bucket 3
It has the required size and shape suitable for mounting on.

The shoe body 4 is made of a material such as ordinary cast iron to spheroidal graphite or stainless steel having excellent corrosion resistance as in the conventional case, and is integrally formed in the shape shown in FIG. In this case, since the shoe body is not excellent in wear resistance, the surface of the body 41 of the shoe, that is, the contact surface with the rail is sprayed with ceramic to cover the entire contact surface with the rail as shown in FIG. Thus, the ceramic sprayed layer 43 is formed and integrated.

Further, as a ceramic for forming the ceramic sprayed layer 43, alumina-based ceramics, zirconium oxide-based ceramics, and others are appropriately used.
A large number of gaps are formed in the ceramic sprayed layer 43. If the same conventional cast iron or spheroidal graphite is used as the material of the shoe body, sewage and the like enter through the gaps and the shoe body of the base material. To corrode. In order to prevent the corrosion of the shoe body of the base material and the peeling of the ceramic, a sealing treatment is performed. In this method, after the ceramic spraying, a required synthetic resin, for example, a silicon resin is poured into the gap of the ceramic sprayed layer 43 or filled to completely seal the gap. In this case, when the shoe body of the base material is made of corrosion-resistant stainless steel, this sealing process may be omitted.

Further, in the embodiment of the sand scraper B shown in the drawing, an endless chain 2 is stretched in the water channel 1 along the longitudinal direction thereof, and flights 6, 6 are formed on the chain 2 at required intervals. A large number of 6 are provided so that sludge settling at the bottom of the waterway can be scraped toward the sludge hopper by flight.

The shoe 7 attached to the flight 6 has the shape of the shoe body 4 appropriately determined according to the shape of the flight 6, and this shoe body also sprays ceramic on the surface of the body 41 of the shoe, that is, the contact surface with the rail. As shown in FIG. 2, the ceramic spray-coated layer 43 is formed so as to cover the entire contact surface with the rail and is integrated.

[0013]

The wear-resistant shoe in the sewage treatment machine of the present invention is a shoe used in a sewage treatment machine such as a sand lifter and a sludge attractor, in which ceramic is sprayed onto at least the sliding surface of the shoe with the rail. The ceramic sprayed layer is integrally formed with this, and the ceramic sprayed layer with wear resistance is sealed, so wear resistance and corrosion resistance are improved, the life of the shoe is dramatically extended, and the time for shoe replacement is increased. Can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a shoe in a sewage treatment machine of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a front view showing a state in which the shoe of the present invention is attached to the sand lifter.

FIG. 4 is a plan view of the same.

FIG. 5 is a front view of the sand lifter.

FIG. 6 is a vertical sectional view of the same.

FIG. 7 is a front view of a sludge attractor.

FIG. 8 is a vertical sectional view of the same.

[Explanation of symbols]

 1 Channel 2 Chain 3 Bucket 4 Shoe 41 Shoe Body 42 Mounting Flange 5 Rail 6 Flight 7 Shoe A Sand Lifter B Sludge Scratcher

Claims (3)

[Claims] 1. A shoe used in a sewage treatment machine such as a sand lifter and a sludge attractor, which is a wear-resistant shoe in a sewage treatment machine in which at least a sliding surface of the shoe with respect to a rail is wear-resistant. 2. A sewage treatment machine according to claim 1, wherein in a shoe having a wear resistant sliding surface with a rail, a ceramic sprayed layer is integrally formed by spraying a ceramic on a portion slidingly contacting the rail. Abrasion resistant shoe. 3. A wear-resistant shoe for a sewage treatment machine according to claim 1, wherein a ceramic sprayed layer formed by spraying ceramic is subjected to a sealing treatment on the contact surface of the shoe with the rail.