CN205008044U - Compound grinding roller of detachable ceramal - Google Patents

Abstract

The utility model discloses a detachable ceramic alloy composite grinding roller, which comprises a grinding roller core cast from a metal matrix material. The leather liner is composed of wear-resistant alloy material and cast ceramic prefabricated parts. There are bolt holes on the end surface of the roller leather liner, and the bolts connected with the grinding roller core are installed in the bolt holes. The grinding roller core is fixedly connected with the roller skin liner through bolts, and a ceramic body is inlaid on the upper part of the bolt holes. The roller leather lining plate of the utility model is small in size and light in weight, the casting quality and heat treatment process are easy to control, and the qualified rate of finished products is high; It also has the toughness of metal materials; because the end surface of the roller leather lining is fixed by bolts, it can be disassembled on site, and then replaced with a new roller leather lining.

Description

A detachable ceramic alloy composite grinding roller

technical field

The utility model relates to a detachable ceramic alloy composite grinding roller, which is suitable for grinding rollers of various vertical mills in thermal power generation, cement, metallurgy, mining and other industries.

Background technique

In industries such as electric power, cement, metallurgy, and mining, a large number of grinding rollers are used in the pulverizing system. As the main wear-resistant part, its quality, especially the wear resistance, directly affects the operation rate of pulverizing, pulverized coal Quality, roll consumption and production costs. Due to any grinding roller material, there is serious wear and tear under the working conditions of pulverization. When serious pits and grooves appear in the wear, the pulverized coal efficiency of the coal mill decreases, and the output of the coal mill is insufficient.

At present, most of the grinding rollers used in thermal power plants are integrally cast high-chromium cast iron. Repeated welding of wear-resistant alloy layers on them after running wear can improve the service life of the grinding rollers, but the integrally cast high-chromium alloy grinding rollers encounter When the coal quality is poor, it is easy to break during the wear process. In addition, although surfacing welding can improve the service life, it is prone to shedding of the surfacing layer. In addition, the cost of surfacing welding is relatively high, and the service life can be extended by at most one year after surfacing welding once. Frequent maintenance shutdowns of power plants have caused great economic losses. loss.

The composite grinding roller produced by Vega Company in India adopts the secondary casting process. Firstly, the ceramic alloy composite liner is prepared by casting the wear-resistant ceramic grid body with high chromium alloy material, and then the ceramic alloy composite liner is prepared by secondary casting. Composite grinding roller, this process solves the problem of short service life and high price of the overall high-chromium alloy grinding roller, but there are no wear-resistant defects of ball milled cast iron between each liner on the entire roll surface, and once the wear is serious, it will accelerate the ceramic alloy. The liner is worn out. In addition, the entire grinding roller cannot be repaired after being scrapped, and it is directly scrapped, which adds a lot of maintenance costs to the power plant. The ceramic alloy composite grinding roller produced by Belgian Magotteaux Company is made of a ceramic core plate (compounded by ceramic particles) with a high-chromium alloy material, which meets the service life of the coal mill, but after the grinding roller is scrapped, The roller core cannot be repaired by surfacing, and the repurchase of the grinding roller increases the expenditure of the power plant. In addition, the technology is mastered abroad, and the after-sales service cycle is long, so it is impossible to solve the quality problems for the power plant in time.

Utility model content

Purpose of the utility model: The purpose of the utility model is to solve the deficiencies in the prior art, and provide a detachable roller skin liner with small size, light weight, easy control of casting quality and heat treatment process, high qualified rate of finished products, and convenient disassembly. Type ceramic alloy composite grinding roller.

Technical solution: A detachable ceramic alloy composite grinding roller, including a grinding roller core cast from a metal matrix material, the surface of the grinding roller core is equipped with a segmented roller skin liner, and the roller skin liner is The plate is made of a wear-resistant alloy material and a cast ceramic prefabricated part. The end surface of the roller skin lining plate is provided with a bolt hole, and the bolt hole is equipped with a bolt connected with the roller core of the grinding roller. The roller core is fixedly connected with the roller skin liner through bolts, and a ceramic body is embedded in the upper part of the bolt holes.

Further, the metal base material is ductile iron or medium carbon steel.

Further, the bottom surface of the roller skin liner is a planar structure.

Further, the surface of the grinding roller core has a polygonal planar structure.

Further, the wear-resistant alloy material is high-chromium cast iron or high-manganese steel.

Further, the ceramic preform is formed by mixing and sintering ceramic particles and metal alloy powder.

Further, the ceramic prefabricated part is honeycomb or grid, with a thickness of 20-50 mm.

Further, the bolts are countersunk head bolts.

Beneficial effects: the utility model has the following beneficial effects:

(1) The surface of the roller skin liner is made of high wear-resistant ceramic prefabricated parts and wear-resistant alloy, which has double wear resistance and the toughness of metal materials;

(2) The ceramic prefabricated part adopts a honeycomb or grid shape, and different wear-resistant materials on the surface form a height difference during operation and wear, which helps to improve the grinding efficiency of coal powder;

(3) The bottom surface of the roller skin lining is designed as a flat structure for easy processing, and the surface-to-surface contact with the polygonal roller core is realized, which ensures that the roller skin will not break during operation, and solves the problem of the bottom surface of the previous roller skin lining It is a difficult problem that the arc surface or spherical structure does not match the surface of the roller core and is easy to break during operation;

(4) The roller core is made of ductile iron or medium carbon steel, which ensures the good toughness and impact resistance of the composite grinding roller. The casting does not need to be heat treated, and the material itself is relatively cheap compared to the wear-resistant alloy material, which reduces the manufacturing cost;

(5) The roller skin liner is small in size and light in weight, the casting quality and heat treatment process are easy to control, and the qualified rate of finished products is high;

(6) In the later stage of composite grinding roller wear, because the end surface of the roller leather lining is fixed by bolts, it can be disassembled on site, and then replaced with a new roller leather lining, which solves the problem that the composite grinding roller cannot be repaired, which not only shortens the maintenance time but also saves Substantial maintenance costs.

Description of drawings

Fig. 1 is the sectional view of the assembly structure of the composite grinding roller of the present invention;

Fig. 2 is the front view of the assembly structure of the composite grinding roller of the present invention;

Fig. 3 is the structural representation of the utility model ceramic preform;

Fig. 4 is A-A sectional view of Fig. 3;

Fig. 5 is the structural representation of the utility model roller leather liner;

Fig. 6 is A-A sectional view of Fig. 5;

Fig. 7 is the structural representation of the utility model roller core;

FIG. 8 is a cross-sectional view of FIG. 7 .

detailed description

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail:

A detachable ceramic alloy composite grinding roller as shown in Figures 1 to 8, the composite grinding roller includes a grinding roller core 1 cast from a metal matrix material, and the surface of the grinding roller core 1 is installed with a A block-type roller leather lining 2, the roller leather lining 2 is made of a wear-resistant alloy material and a cast ceramic prefabricated part 3, the end surface of the roller leather lining 2 is provided with a bolt hole, and the bolt hole is installed There are bolts 4 connected with the grinding roller core 1, and the grinding roller core 1 is fixedly connected with the roller skin liner 2 through the bolts 4, and a ceramic body 5 is embedded in the upper part of the bolt hole.

As a further optimization of the above technical solution, the metal base material is ductile iron or medium carbon steel. The bottom surface of the roller lining 2 is a planar structure. The surface of the grinding roller core 1 has a polygonal planar structure. The wear-resistant alloy material is high chromium cast iron or high manganese steel. The ceramic preform 3 is formed by mixing and sintering ceramic particles and metal alloy powder. The ceramic prefabricated part 3 is in the shape of honeycomb or grid, and the thickness is 20-50mm. The bolt 4 is a countersunk head bolt.

When assembling the composite grinding roller, the roller skin liner 2 composed of high-chromium cast iron cast ceramic prefabricated parts 3 is installed piece by piece on the surface of the grinding roller core 1 cast by ductile iron, and the end surface of the roller skin liner is provided with The bolt hole is equipped with a bolt 4 connected with the roller core, and the upper part of the bolt hole is inlaid with a ceramic body 5 .

The utility model has the following beneficial effects:

(1) The surface of the roller skin liner is made of high wear-resistant ceramic prefabricated parts and wear-resistant alloy, which has double wear resistance and the toughness of metal materials;

(2) The ceramic prefabricated part adopts a honeycomb or grid shape, and different wear-resistant materials on the surface form a height difference during operation and wear, which helps to improve the grinding efficiency of coal powder;

(3) The bottom surface of the roller skin lining is designed as a flat structure for easy processing, and the surface-to-surface contact with the polygonal roller core is realized, which ensures that the roller skin will not break during operation, and solves the problem of the bottom surface of the previous roller skin lining It is a difficult problem that the arc surface or spherical structure does not match the surface of the roller core and is easy to break during operation;

(4) The roller core is made of ductile iron or medium carbon steel, which ensures the good toughness and impact resistance of the composite grinding roller. The casting does not need to be heat treated, and the material itself is relatively cheap compared to the wear-resistant alloy material, which reduces the manufacturing cost;

(5) The roller skin liner is small in size and light in weight, the casting quality and heat treatment process are easy to control, and the qualified rate of finished products is high;

(6) In the later stage of composite grinding roller wear, because the end surface of the roller leather lining is fixed by bolts, it can be disassembled on site, and then replaced with a new roller leather lining, which solves the problem that the composite grinding roller cannot be repaired, which not only shortens the maintenance time but also saves Substantial maintenance costs.

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solution of the utility model Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (8)

1. A detachable ceramic alloy composite grinding roller, characterized in that it includes a grinding roller core (1) cast from a metal matrix material, and the surface of the grinding roller core (1) is equipped with a segmented roller A leather lining (2), the roller leather lining (2) is made of a wear-resistant alloy material and a cast ceramic prefabricated part (3), and the end surface of the roller leather lining (2) is provided with a bolt hole, so Bolts (4) connected to the grinding roller core (1) are installed in the bolt holes, and the grinding roller core (1) is fixedly connected to the roller skin liner (2) through the bolts (4), A ceramic body (5) is inlaid on the upper part of the bolt hole. 2. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: the metal base material is ductile iron or medium carbon steel. 3. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: the bottom surface of the roller skin liner (2) is a plane structure. 4. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: the surface of the grinding roller core (1) has a polygonal planar structure. 5. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: said wear-resistant alloy material is high chromium cast iron or high manganese steel. 6. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: the ceramic prefabricated part (3) is formed by mixing and sintering ceramic particles and metal alloy powder. 7. A detachable ceramic alloy composite grinding roller according to claim 1 or 6, characterized in that: the ceramic prefabricated part (3) is honeycomb or grid-shaped, with a thickness of 20-50 mm. 8. A detachable ceramic alloy composite grinding roller according to claim 1, characterized in that: the bolts (4) are countersunk bolts.