Bearing steel continuous crystallization furnace

Abstract

The utility model relates to the technical field of continuous crystallization furnaces, in particular to a bearing steel continuous crystallization furnace which comprises a furnace body, a pipeline is arranged at the bottom of the furnace body in a penetrating mode, a valve is arranged at the position, close to the bottom of the furnace body, of the pipeline, a valve element of the valve is embedded in the pipeline, and one end of the pipeline is communicated with the interior of the furnace body. A heat conduction sleeve wraps the surface of the pipeline, a plurality of electric heating pipes are fixed in the heat conduction sleeve in a penetrating mode, a material pump is arranged at the other end of the pipeline, and the feeding end of the material pump is in butt joint with a flange at the end, away from the furnace body, of the pipeline. According to the scheme, by optimizing the design of the pipeline and the valve, the stability and safety of liquid metal transmission are remarkably improved, the pipeline is made of a tungsten alloy material and is matched with the externally-wrapped heat conduction sleeve and the built-in electric heating pipe, a dynamic heat preservation system is formed, heat loss of the liquid metal in the flowing process is effectively reduced, and the service life of the liquid metal is prolonged. And the problem of metal condensation caused by temperature drop is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to continuous crystallization furnace technical field especially, relates to a bearing steel continuous crystallization furnace. BACKGROUND

[0002] The bearing steel continuous crystallization furnace is a kind of equipment for producing high-quality bearing steel. This equipment cools and solidifies liquid metal into bearing steel material with excellent performance through continuous crystallization process.

[0003] The bearing steel continuous crystallization furnace is widely used in bearing manufacturing, automobile industry, aerospace and other fields, can produce high-quality bearing steel material, meet the needs of different customers, through continuous crystallization process, can improve production efficiency and product quality, reduce production cost, such as prior art Chinese patent publication number "CN210765396U" provides a bearing steel seamless pipe production with the continuous furnace of convenient high-end recrystallization, including furnace body, the center of the furnace body is provided with making groove, the right side of two groups of recess is provided with first through-hole, the inside of two groups of first through-hole is clamped with heater. The bearing steel seamless pipe production with the continuous furnace of convenient high-end recrystallization, by opening multiple heaters, control rotary motor operation, drive first gear to rotate and move up and down on meshing first rack, to make the output end of two groups of heaters move up and down in making groove and heat, control motor operation, drive second gear to rotate and move left and right on meshing second rack, to make the output end of two groups of heaters move left and right in making groove and heat, thus two points reached the effect of rapid heating in continuous furnace and simple operation.

[0004] At present, in bearing steel production, need to be processed through crystallization furnace, the main part of crystallization furnace is smelting furnace and the structure for liquid metal, because the melting point of bearing steel is 1400 to 1500 degrees, ordinary smelting furnace cannot meet its production standard, simultaneously, most smelting furnaces only rely on gravity effect, so that metal is melted into liquid, discharges, such that not only in pipeline conveying, metal is easy to condense, thereby, influence the processing quality of bearing. UTILITY MODEL CONTENT

[0005] The utility model aims at solving the above-mentioned shortcomings in prior art and provides a bearing steel continuous crystallization furnace.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The utility model provides a bearing steel continuous crystallization furnace, including the furnace body, the bottom of furnace body is through being provided with the pipeline, the pipeline is close to the bottom position of furnace body and is provided with the valve, the valve core inlay is in the inside of pipeline, one end of pipeline is in communication with the inside of furnace body is established, the surface of pipeline is wrapped with the heat conducting cover, a plurality of electric heating tubes are fixed in the inside of heat conducting cover, the other end of pipeline is provided with the material pump, the feed end of material pump is with pipeline far away from the flange butt joint of furnace body,

[0008] The inside of the furnace body is fixedly embedded with a heating coil, and the two ends of the heating coil are respectively provided with terminal posts for connecting positive and negative electrodes, which extend outwardly through the side wall of the furnace body.

[0009] The bottom of the furnace body is fixedly covered with a filter cover, a plurality of discharge holes are formed in the connection position of the filter cover and the bottom of the furnace body, and the discharge holes are arranged in a ring shape and equidistantly distributed along the outer wall of the filter cover.

[0010] In detail, the pipeline and the heat conducting cover are made of tungsten alloy material.

[0011] In detail, the furnace body is composed of an outer layer, a heat insulation layer, a high-temperature-resistant layer and an inner lining in sequence, the inner side of the outer layer is fixedly wrapped with the heat insulation layer, the inner side of the heat insulation layer is fixedly wrapped with the high-temperature-resistant layer, and the inner side of the high-temperature-resistant layer is fixedly wrapped with the inner lining.

[0012] In detail, the outer layer is made of nickel-based alloy material.

[0013] In detail, the heat insulation layer is made of magnesium brick material.

[0014] In detail, the high-temperature-resistant layer is made of silicon carbide material.

[0015] In detail, the inner lining is made of alumina material.

[0016] The design scheme provided by the utility model has the following beneficial effects in the application process:

[0017] 1. The design of the pipeline and the valve is optimized, the stability and safety of the liquid metal transmission are significantly improved, the pipeline is made of tungsten alloy material, cooperates with the heat conducting cover wrapped outside and the electric heating tube arranged inside, forms a dynamic heat preservation system, effectively reduces the heat loss of the liquid metal in the flowing process, avoids the metal condensation problem caused by the temperature drop, at the same time, the specially designed valve (liquid metal valve) has the characteristics of high temperature resistance, high strength and insulation, can withstand the impact of high temperature and high density metal liquid, ensures that the valve will not fail due to thermal stress or chemical corrosion in long-term use.

[0018] 2、According to the description 1, the multi-layer composite structure of the scheme greatly improves the overall heat insulation performance and high temperature resistance, provides an ideal environment for the continuous melting and crystallization of bearing steel, the outer layer adopts nickel-based alloy to ensure the mechanical strength of the furnace body at high temperature, the magnesium brick material of the heat insulation layer effectively blocks the heat from spreading outward, reduces the energy consumption, the silicon carbide of the high temperature resistance layer has high hardness and thermal conductivity, can quickly and uniformly transfer heat, and the inner lining of alumina resists chemical corrosion of the metal melt. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is overall structure schematic diagram of the utility model;

[0020] Figure 2 It is bottom view schematic diagram of the utility model;

[0021] Figure 3 It is filter cover position schematic diagram of the utility model;

[0022] Figure 4 It is furnace body structure composition schematic diagram of the utility model.

[0023] In the drawing: 1, furnace body;11, pipeline;12, valve;13, heat conducting sleeve;14, electric heating tube;15, material pump;16, heating coil;17, terminal post;18, filter cover;19, discharge hole;1001, outer layer;1002, heat insulation layer;1003, high temperature resistance layer;1004, inner lining. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be described clearly and completely below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments.

[0025] Reference Figures 1-4The utility model relates to a bearing steel continuous crystallization furnace, including furnace body 1, the bottom of furnace body 1 is passed through and is provided with pipeline 11, pipeline 11 is provided with valve 12 close to the bottom position of furnace body 1, and valve 12 is also called liquid metal valve or high temperature metal valve, because liquid metal has high temperature, high density and good conductivity, therefore need to guarantee that valve 12 has certain high temperature resistance, high strength and insulation effect, the valve core of valve 12 is embedded in the inside of pipeline 11, one end of pipeline 11 is communicated with the inside of furnace body 1 and is arranged, the surface of pipeline 11 is wrapped with heat conduction sleeve 13, a plurality of electric heating tubes 14 are fixed in the inside of heat conduction sleeve 13, and electric heating tube 14 can assist heating, so that the heat loss of liquid metal can be reduced when passing through pipeline 11 by the heat conduction effect of heat conduction sleeve 13, and the condensation condition is avoided, and the other end of pipeline 11 is provided with material pump 15, and the feed end of material pump 15 is flange butt joint with the one end of pipeline 11 away from furnace body 1, and material pump 15 is also called liquid metal pump or high temperature metal pump, and like valve 12, is treated specially, guarantees the normal passage of liquid metal, and simultaneously, will not cause damage to the internal components of material pump 15;

[0026] The inside of furnace body 1 is fixed and embedded with heating coil 16, and the two ends of heating coil 16 are provided with terminal posts 17 for positive and negative electrode access, respectively, the terminal posts 17 are passed through the side wall of furnace body 1 and are arranged outwardly, the material of bearing steel can be melted by high-temperature heating of heating coil 16, forming liquid metal;

[0027] The bottom of furnace body 1 is fixedly covered with filter cover 18, a plurality of discharge holes 19 are formed in the joint position of filter cover 18 and the bottom of furnace body 1, the discharge holes 19 are arranged in a ring shape at equal intervals along the outer wall of filter cover 18, and the filter cover 18 can avoid that the completely melted metal directly enters the pipeline 11 through the discharge hole 19 position, mainly playing a filtering and screening effect.

[0028] It is further explained that the pipeline 11 and the heat conduction sleeve 13 are made of tungsten alloy material, which has good high-temperature resistance and sufficient hardness.

[0029] It is further explained that the furnace body 1 is composed of an outer layer 1001, a heat insulation layer 1002, a high-temperature-resistant layer 1003, and an inner lining 1004 in sequence, the inner side of the outer layer 1001 is fixedly wrapped with the heat insulation layer 1002, the inner side of the heat insulation layer 1002 is fixedly wrapped with the high-temperature-resistant layer 1003, and the inner side of the high-temperature-resistant layer 1003 is fixedly wrapped with the inner lining 1004.

[0030] It is further explained that the outer layer 1001 is made of nickel-based alloy material, which can maintain its strength and stability in a high-temperature environment.

[0031] Further, the heat insulation layer 1002 is made of magnesium brick material, which has good alkali resistance and high temperature resistance, and can be used as the main heat insulation structure.

[0032] Further, the high-temperature-resistant layer 1003 is made of silicon carbide material, which has high hardness and good thermal conductivity, and is suitable for high-temperature furnace walls.

[0033] Further, the inner lining 1004 is made of alumina material, which has a high melting point and good corrosion resistance, and is suitable for high-temperature furnace lining.

[0034] Working mode: The scheme significantly improves the flow stability of liquid metal and the thermal energy utilization efficiency through multi-level heating and insulation design. First, the heat conduction sleeve 13 wrapped around the pipeline 11 integrates the electric heating pipe 14 to form an active heating system, which can accurately compensate for the heat loss of the liquid metal during transportation, avoiding the condensation or reduced flow of the metal due to temperature drop, especially for high-melting-point bearing steel materials. Second, the furnace body 1 adopts a four-layer composite structure (outer layer 1001, heat insulation layer 1002, high-temperature-resistant layer 1003, and inner lining 1004), in which the magnesium brick heat insulation layer 1002 and the silicon carbide high-temperature-resistant layer 1003 work together to reduce heat loss and ensure the uniformity of the high-temperature environment in the furnace, so that the energy of the heating coil 16 is concentrated on the metal melting. In addition, the pipeline 11 and the heat conduction sleeve 13 made of tungsten alloy material have high temperature resistance (can withstand temperatures above 1500°C) and high thermal conductivity, further optimizing the heat transfer efficiency. This design keeps the liquid metal in a controllable high-temperature state from melting to transportation, reducing energy consumption and improving the stability of continuous production, especially suitable for large-scale production of high-purity bearing steel.

[0035] The scheme realizes effective screening of unmelting metal residues through a unique filter cover 18 and discharge hole 19 design, thereby ensuring the purity of the liquid metal. The filter cover 18 covers the bottom of the furnace body 1, and the annular distribution of the discharge hole 19 only allows the completely melted metal liquid to pass through, while the unmelting particles or oxide impurities are blocked in the furnace body for further heating and decomposition. This mechanism solves the problem of casting defects such as pores or inclusions caused by impurities mixed into the traditional crystallizer. At the same time, the inner lining 1004 is made of alumina material, which has high corrosion resistance and avoids the introduction of impurities by the reaction between the furnace wall and the liquid steel. The high hardness of the silicon carbide high-temperature-resistant layer 1003 further prevents the furnace body from being worn and particles from falling off. Combined with the special treatment (such as insulation and high-temperature resistance design) of the pump 15 and the valve 12, the entire system avoids secondary pollution during transportation.

[0036] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A continuous crystallization furnace for bearing steel comprising a furnace body (1), characterized in that: The bottom of the furnace body (1) is provided with a pipeline (11), the valve (12) is arranged near the bottom of the furnace body (1), the valve core of the valve (12) is embedded in the inside of the pipeline (11), one end of the pipeline (11) is communicated with the inside of the furnace body (1), the surface of the pipeline (11) is wrapped with a heat conducting sleeve (13), a plurality of electric heating pipes (14) are fixed in the inside of the heat conducting sleeve (13), the other end of the pipeline (11) is provided with a material pump (15), the feeding end of the material pump (15) is flange connected with the end of the pipeline (11) away from the furnace body (1). The inside of the furnace body (1) is fixedly embedded with a heating coil (16), the two ends of the heating coil (16) are respectively provided with wire posts (17) for positive and negative electrode access, the wire posts (17) extend outwardly through the side wall of the furnace body (1); The bottom of the furnace body (1) is fixedly covered with a filter cover (18), a plurality of discharge holes (19) are formed in the connection position of the filter cover (18) and the bottom of the furnace body (1), the discharge holes (19) are arranged in a ring shape and equidistantly distributed along the outer wall of the filter cover (18).

2. A continuous crystallization furnace for bearing steel according to claim 1, characterized in that: The pipeline (11) and the heat conducting sleeve (13) are made of tungsten alloy material.

3. A continuous crystallization furnace for bearing steel according to claim 1, characterized in that: The furnace body (1) is composed of an outer layer (1001), a heat insulation layer (1002), a high temperature resistant layer (1003) and an inner lining (1004) in sequence, the inner side of the outer layer (1001) is fixedly wrapped with the heat insulation layer (1002), the inner side of the heat insulation layer (1002) is fixedly wrapped with the high temperature resistant layer (1003), and the inner side of the high temperature resistant layer (1003) is fixedly wrapped with the inner lining (1004).

4. A continuous crystallization furnace for bearing steel according to claim 3, characterized in that: The outer layer (1001) is made of nickel-based alloy material.

5. A continuous crystallization furnace for bearing steel according to claim 3, characterized in that: The heat insulation layer (1002) is made of magnesium brick material.

6. A continuous crystallization furnace for bearing steel according to claim 3, characterized in that: The high temperature resistant layer (1003) is made of silicon carbide material.

7. A continuous crystallization furnace for bearing steel according to claim 3, characterized in that: The inner lining (1004) is made of alumina material.

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