Bimetal feed port for mill

Abstract

The invention discloses a bimetal feeding port for a grinding machine, and relates to the technical field of grinding equipment, the bimetal feeding port for the grinding machine comprises a feeding port, and the feeding port comprises an inner layer and an outer layer; the outer layer of the feeding hole is made of carbon steel; the inner layer of the feeding port is made of high-chromium cast iron, the feeding port is designed to be of a two-layer structure, the inner layer is made of the high-chromium cast iron, the hardness of the feeding port reaches more than HRC55 degrees, all working faces needing wear resistance have good wear resistance, the outer layer is made of carbon steel, and therefore the outer layer machining portion of the feeding port is easy to machine. The performance characteristics of the two materials are ingeniously utilized, so that the service life of the feeding port is greatly prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of grinding equipment, and more particularly to a bimetal feed port for a grinding machine. Background Art

[0002] The ball mill is a common industrial grinding equipment, mainly used to grind raw materials into fine powder. It places abrasives (usually steel balls) and raw materials in a rotating cylinder, and uses the force of friction and impact to grind the raw materials into the required fine powder; ball mills are widely used in mining, metallurgy, chemical industry, building materials, pharmaceutical and other industries. It can be used to grind materials of various hardness and humidity, including ores, mineral sands, cement, chemical raw materials, etc. Ball mills play an important role in processes such as ore grinding, coal grinding and ore grinding in cement production; when the cylinder rotates, the abrasive and raw materials are driven and rotate with the cylinder. During the rotation process, friction and impact occur between the abrasive and the raw materials, and the raw materials are gradually ground into fine powder. The movement and collision of the grinding media generate friction and impact force, which helps the raw materials to be ground into fine powder.

[0003] Rod mill is a mill with steel rods as grinding media in the cylinder. It is usually a wet overflow type and can be used as a primary open circuit grinding. It is widely used in artificial stone sand, ore dressing plants, chemical plants and power departments. Rod mills are mainly used for coarse grinding of harder materials, and can achieve selective grinding to a certain extent. Rod mills play an important role in ferrous and non-ferrous metal beneficiation plants and other occasions where hard materials need to be coarsely crushed. Rod mills are asynchronous motors connected to small gears through reducers, directly driving the surrounding large gears to reduce speed and drive the rotating part to rotate. The cylinder is equipped with appropriate grinding media - steel rods. Under the action of centrifugal force and friction, the grinding media continuously enters the cylinder from the feeding part, is crushed by the moving grinding media, and is discharged from the machine through overflow and continuous feeding to proceed to the next process.

[0004] At present, the feed ports of mills such as CITIC original factory or Jinan Heavy Industry are all cast from chromium-molybdenum alloy steel. This chromium-molybdenum alloy steel is a low-alloy cast steel, which has certain wear resistance after heat treatment and is also easy to process.

[0005] However, the wear resistance of the feed port is not good enough and needs to be improved. Based on the above problems, we provide bimetal feed ports for mills.

[0006] The above information disclosed in this background technology is only used to increase the understanding of the background technology of the present invention and therefore, it may include information that does not constitute the prior art known to ordinary technicians in this field. Summary of the invention

[0007] In order to solve the problem in the background technology mentioned above that the wear resistance of the existing mill feed port needs to be improved, the present invention provides a bimetal feed port for a mill.

[0008] The bimetal feed port for a mill provided by the present invention adopts the following technical solution:

[0009] A bimetal feed port for a mill comprises a feed port, wherein the feed port comprises an inner layer and an outer layer; the outer layer of the feed port is made of carbon steel; and the inner layer of the feed port is made of high chromium cast iron.

[0010] By adopting the above technical solution, the feed port is designed into a two-layer structure, the inner layer is made of high chromium cast iron, and its hardness reaches HRC55° or above, and the working surface that needs wear resistance has good wear resistance, and the outer layer is made of carbon steel, so that the outer processing part of the feed port is easy to be processed. By cleverly utilizing the performance characteristics of the two materials, the service life of the feed port is greatly extended.

[0011] Preferably, an auger is installed inside the feed port.

[0012] The above technical solution is used to transport materials into the mill.

[0013] Preferably, a connecting flange is provided at the bottom of the feed port.

[0014] By adopting the above technical solution, it is convenient to assemble the feed port on the grinding mill.

[0015] Preferably, a plurality of connection holes are provided on the side of the connection flange.

[0016] The technical solution is adopted to assemble bolts.

[0017] Preferably, the feeding port is in the shape of a truncated cone.

[0018] By adopting the above technical solution, the transportation and discharge of materials are facilitated.

[0019] Preferably, the connecting flange is welded and assembled on the small diameter end of the feed port.

[0020] By adopting the above technical solution, the feed port is assembled at the feeding end of the mill.

[0021] In summary, the present invention includes the following beneficial technical effects:

[0022] High chromium cast iron, full name high chromium white cast iron, is a wear-resistant material with excellent performance and special attention; high chromium cast iron is mainly composed of Fe (iron), Cr (chromium), and C (carbon), and is a multi-element alloy. Its chromium content is usually between 12% and 28%, which makes the M3C carbide in white cast iron transform into M7C3 carbide, thus giving high chromium cast iron excellent wear resistance; high chromium cast iron has the basic characteristics of wear resistance, high toughness, and high strength. Its wear resistance is much better than alloy steel, while its toughness and strength are significantly higher than general white cast iron. In addition, high chromium cast iron also has good high temperature resistance and corrosion resistance, and its production is convenient and cost-effective; carbon steel is a widely used metal material, mainly composed of iron and carbon, and usually contains a small amount of silicon, manganese, sulfur, phosphorus and other elements. Its carbon content is between 0.0218% and 2.11%, also known as carbon steel; the mechanical properties of carbon steel depend on the carbon content and heat treatment method. Generally speaking, low carbon steel has high ductility and plasticity, but low strength; high carbon steel has high strength and hardness, but correspondingly low ductility. Medium carbon steel is between the two, with high strength and hardness, suitable for manufacturing mechanical parts, bearings, etc.; the production process of carbon steel includes smelting, molten steel purification, casting, heating treatment, cooling and processing. Among them, welding, heat treatment and processing are key links; by designing the feed port into a two-layer structure, the inner layer is made of high chromium cast iron, and its hardness reaches HRC55° or above, and the wear-resistant working surface has good wear resistance, and the outer layer is made of carbon steel, so that the outer processing part of the feed port is easy to be processed, and the performance characteristics of the two materials are cleverly utilized, thereby greatly extending the service life of the feed port.

[0023] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a bimetal feed port for a mill in an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of the internal structure of a bimetal feed port for a mill in an embodiment of the present invention;

[0026] Figure 3 1 is a schematic diagram of the side structure of a bimetal feed port for a mill in an embodiment of the present invention;

[0027] Figure 4 Schematic diagram of the structure of the inner layer and the outer layer in an embodiment of the present invention.

[0028] Explanation of reference numerals: 1, feed port; 100, inner layer; 101, outer layer; 2, auger; 3, connecting flange. DETAILED DESCRIPTION

[0029] The following is combined with Figures 1 to 4 The present invention is described in further detail.

[0030] It should be noted that the drawings are schematic and not to scale. For the sake of clarity and convenience, the relative sizes and proportions of the parts shown in the drawings are exaggerated or reduced in size, and any size is only illustrative and not restrictive. In addition, the same reference symbol is used for the same structure, element or accessory appearing in more than two figures to reflect similar features.

[0031] The embodiment of the present invention discloses a bimetal feed port for a grinding mill. Figures 1 to 4 The bimetal feed port for the mill comprises a feed port 1, wherein the feed port 1 comprises an inner layer 100 and an outer layer 101; the outer layer 101 of the feed port 1 is made of carbon steel; the inner layer 100 of the feed port 1 is made of high chromium cast iron.

[0032] Specifically, the feed port 1 is designed to have a two-layer structure, wherein the inner layer 100 is made of high chromium cast iron with a hardness of HRC55° or above, and the working surfaces that require wear resistance have good wear resistance, and the outer layer 101 is made of carbon steel, so that the outer processing part of the feed port 1 is easy to be processed. By cleverly utilizing the performance characteristics of the two materials, the service life of the feed port 1 is greatly extended.

[0033] Specifically, the high chromium cast iron is KMTBCr24 (mainly composed of chromium and carbon, which give it hardness and durability. The specific composition may vary, but generally includes elements such as manganese, silicon and molybdenum to enhance specific properties such as toughness and corrosion resistance; the heat treatment process of KMTBCr24 includes annealing, quenching and tempering to achieve the desired microstructure. This treatment improves the mechanical properties and wear resistance of the material), KMTBCr24 is quenched and the hardness reaches above HRC55°.

[0034] Specifically, the feed port 1 is internally equipped with an auger 2, which is made of high-chromium cast iron and has a sheet metal outer surface, and is used to transport materials into the mill.

[0035] Specifically, a connecting flange 3 is provided at the bottom of the feed port 1 to facilitate assembly of the feed port 1 on the mill.

[0036] Specifically, a plurality of connection holes are provided on the side of the connection flange 3 for assembling bolts.

[0037] Specifically, the feeding port 1 is in the shape of a truncated cone, which is convenient for conveying and discharging materials.

[0038] Specifically, the connecting flange 3 is welded and assembled on the small diameter end of the feed port 1, so as to assemble the feed port on the feeding end of the mill.

[0039] contrast:

[0040] Feed port type Processing Wear resistance (Chromium-molybdenum alloy steel) feed port The outside is difficult to process generally Feeding port (of this application) The outer side can be easily processed better

[0041] Through experimental comparison, it is found that the service life of the feed port of the present application is much longer than that of the feed port made of chromium-molybdenum alloy steel.

[0042] Worth noting:

[0043] Chromium-molybdenum alloy steel is an alloy of chromium, molybdenum, iron and carbon. By adding alloying elements such as chromium and molybdenum, its mechanical properties, corrosion resistance and high temperature resistance are significantly improved. Chromium-molybdenum alloy steel has excellent quenching properties and can be deep quenched instead of being limited to surface quenching, which enables it to obtain the required hardness and strength under a wider range of conditions.

[0044] High chromium cast iron, full name high chromium white wear-resistant cast iron, is an anti-wear material with excellent performance and special attention; high chromium cast iron is mainly composed of Fe (iron), Cr (chromium), and C (carbon), and is a multi-element alloy. Its chromium content is usually between 12% and 28%, which causes the M3C carbide in white cast iron to transform into M7C3 carbide, thus giving high chromium cast iron excellent wear resistance; high chromium cast iron has basic characteristics such as wear resistance, high toughness, and high strength. Its wear resistance is far better than that of alloy steel, while its toughness and strength are significantly higher than those of general white cast iron. In addition, high chromium cast iron also has good high temperature resistance and corrosion resistance, and is easy to produce with moderate cost;

[0045] Carbon steel is a widely used metal material, mainly composed of iron and carbon, and usually contains a small amount of silicon, manganese, sulfur, phosphorus and other elements. Its carbon content is between 0.0218% and 2.11%, also known as carbon steel; the mechanical properties of carbon steel depend on the carbon content and heat treatment method. Generally speaking, low carbon steel has higher ductility and plasticity, but lower strength; high carbon steel has higher strength and hardness, but correspondingly lower ductility. Medium carbon steel is between the two, with higher strength and hardness, suitable for manufacturing mechanical parts, bearings, etc.; the manufacturing process of carbon steel includes smelting, molten steel purification, casting, heating treatment, cooling and processing. Among them, welding, heat treatment and processing are key links.

[0046] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0047] The implementation principle of the bimetallic feed port for a mill in an embodiment of the present invention is as follows: the feed port 1 is designed to be a two-layer structure, the inner layer 100 is made of high chromium cast iron, and its hardness reaches HRC55° or above, and the working surface that needs to be wear-resistant has good wear resistance, and the outer layer 101 is made of carbon steel, so that the outer layer processing part of the feed port 1 is easy to be processed. By cleverly utilizing the performance characteristics of the two materials, the service life of the feed port 1 is greatly extended.

[0048] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0052] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0053] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Bimetallic feed port for mill, characterized in that: include: A feed port (1), the feed port (1) comprising an inner layer (100) and an outer layer (101); The outer layer (101) of the feed port (1) is made of carbon steel; The inner layer (100) of the feed port (1) is made of high-chromium cast iron.

2. The bimetal feed port for a mill according to claim 1, characterized in that: The feed port (1) is internally equipped with an auger (2).

3. The bimetal feed port for a mill according to claim 1, characterized in that: A connecting flange (3) is provided at the bottom of the feed port (1).

4. The bimetal feed port for a mill according to claim 3, characterized in that: A plurality of connection holes are provided on the side of the connection flange (3).

5. The bimetal feed port for a mill according to claim 1, characterized in that: The feeding port (1) is in the shape of a truncated cone.

6. The bimetal feed port for a mill according to claim 3, characterized in that: The connecting flange (3) is welded and assembled on the small diameter end of the feed port (1).

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