CN100458339C - Electric heating furnace and its use - Google Patents
Electric heating furnace and its use Download PDFInfo
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- CN100458339C CN100458339C CNB2005101055483A CN200510105548A CN100458339C CN 100458339 C CN100458339 C CN 100458339C CN B2005101055483 A CNB2005101055483 A CN B2005101055483A CN 200510105548 A CN200510105548 A CN 200510105548A CN 100458339 C CN100458339 C CN 100458339C
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- electrothermal
- heating wire
- electrothermal furnace
- crucible
- pull frame
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Abstract
The inventive electrothermal furnace comprises a cover plate, a casing, a thermal insulating layer, a heating wire and a crucible. The thermal insulating layer is fixed on the inner wall of the casing and the crucible is fixed in the casing. It also includes a drawing shelf disposed between the crucible and the thermal insulating layer capable of being drawn out from the electrothermal furnace. The heating wire is fixed in the drawing shelf.
Description
Technical field
The present invention relates to a kind of electrothermal furnace, particularly a kind of electrothermal furnace that is used for magnesium alloy smelting.
Background technology
Industrial, for example in the melting of metal or metal alloy and the casting forming technology, all need to adopt the high-temperature electric heat stove.
For example, magnesium-alloy material is good because of its light weight, specific strength and specific stiffness height, heat-conductivity conducting, damping shock absorption and capability of electromagnetic shielding is good, characteristics such as recovery easily, obtains increasingly extensive application at automobile and 3C electronic applications.The casting forming technology of magnesium-alloy material has characteristics such as production efficiency height, accessory size is accurate, surface quality is good, become the main forming technology of magnesium-alloy material, and this casting forming technology must be used the electrothermal furnace that is used for the smelting metal alloy.
Existing electrothermal furnace generally adopts structure as shown in Figure 1, with a plurality of heating wire 4 that are fixed on shell 3 inner thermal insulating layers 2 inwalls, the both sides of the crucible 5 in the middle of being positioned at is heated.The electrothermal furnace of this structure all is fixed on the inwall owing to heating wire 4, need shut down and take out earlier devices such as cover plate 1, crucible 5, the cost height that workload is big, the time is long, shutdown is spent when maintenance and detection.
And in magnesium alloy pressure-casting technology, the electrothermal furnace operating temperature requires to be controlled at 625 ± 5 ℃ of scopes, and it is the key factor that guarantees the die-cast product quality that smelting temperature is accurately controlled.For reducing electrothermal furnace because of replenishing the temperature fluctuation that magnesium ingot causes, the volume of crucible is generally bigger, and electrothermal furnace needs bigger heating power like this, so generally select diameter thicker big resistance heating wire or electrothermal tube for use.During the work of existing electrothermal furnace, in order to reach accuracy control over temperature, when the electrothermal furnace operating temperature is more than 300 ℃ the time, the every raising of temperature or reduce by 50 ℃ all will be incubated 1 hour to reduce the internal-external temperature difference of crucible.For this reason, heating wire or electrothermal tube are in frequent starting and the duty that stops.But heating wire or electrothermal tube not only damage easily like this, so and a certain heating wire or electrothermal tube damage because each resistance is all big, the temperature of its near zone will sharply descend, the area of heating surface of crucible will form the thermograde of " high temperature-low temperature-high temperature " like this, thereby cause the crucible distortion, have a strong impact on crucible life.
Summary of the invention
The objective of the invention is to be inconvenient to the shortcoming keeping in repair and detect, the electrothermal furnace of a kind of convenient for maintaining and detection is provided in order to solve existing electrothermal furnace.Another object of the present invention provides the application of described electrothermal furnace in magnesium alloy smelting.
Electrothermal furnace provided by the invention comprises cover plate, shell, heat-insulation layer, heating wire and crucible, heat-insulation layer is fixed in the inwall of shell, crucible is fixed in the shell, wherein, also comprise the pull frame, described pull chord position also can be extracted out from described electrothermal furnace between crucible and heat-insulation layer, and described heating wire is fixed in this pull frame.
Electrothermal furnace provided by the present invention is owing to be fixed on heating wire on the pull frame, be inserted into the pull frame in the shell of electrothermal furnace together with heating wire integral body during installation, when needing repairing or detect heating wire, only need so described pull frame is extracted out together with heating wire is whole, convenient and swift, and cost is lower.
Description of drawings
Fig. 1 is the structure chart of electrothermal furnace in the prior art;
Fig. 2 is the structural representation according to electrothermal furnace of the present invention;
Fig. 3 is according to pull frame of the present invention and is fixed in the structural representation of heating wire wherein;
Fig. 4 is the sectional view according to electrothermal tube of the present invention.
The specific embodiment
As shown in Figure 2, electrothermal furnace provided by the invention comprises cover plate 1, shell 3, heat-insulation layer 2, heating wire 4 and crucible 5, heat-insulation layer 2 is fixed in the inwall of shell 3, crucible 5 is fixed in the shell 3, wherein, also comprise pull frame 6, described pull frame 6 also can be extracted out from described electrothermal furnace between crucible 5 and heat-insulation layer 2, and described heating wire 4 is fixed in this pull frame 6.
Described pull frame 6 can be positioned at the position of described crucible needs heating on every side for a plurality of.
The material of described pull frame 6 can be the known various exotic materials of those skilled in the art, as metal, refractory brick (watt) etc.
The material of described heat-insulation layer 2 has no particular limits, and can adopt insulation material well known in the art such as asbestos, mineral wool, mullite brick, Poly Light High Aluminum Firebrick etc.
As shown in Figure 3, the end of described pull frame 6 preferably also has heat-insulation layer 11, and the material of described heat-insulation layer 11 has no particular limits, and can adopt insulation material well known in the art such as asbestos, mineral wool, mullite brick, Poly Light High Aluminum Firebrick etc.
In order to guarantee the electrothermal furnace sealing when inserting electrothermal furnace, to reach the effective purpose of heating, described pull frame 6 also can have end cap 7, and this end cap 7 is fixedly connected on pull frame 6 outer ends, with the slit between sealing pull frame 6 and the shell 3.
Under the preferable case, can also have handle 8 on the described end cap 7, be fixedly connected on the end cap 7, can make things convenient for pull pull frame 6 like this.
Fixedly connected, handle 8 between described end cap 7 and the pull frame 6 can be selected various connected modes such as the known welding of those skilled in the art, riveted joint, bolt are connected for use with the fixedly connected of pull frame 6 or end cap 7.
Described heating wire 4 can be selected the known heating wire that can be used to heat of those skilled in the art for use, and its Standard resistance range can determine that the present invention has no particular limits it according to the needs that use.Preferably; the resistance of this heating wire 4 is unsuitable excessive; near its regional temperature is not affected substantially in the time of can not working when a certain heating wire 4 damages like this; thereby the even heating and the efficiency of heating surface on crucible 5 surfaces have been guaranteed; avoid owing to the crucible 5 that heating wire 4 damages, regional temperature sharply descends the to be caused inequality of being heated is out of shape; prolong the service life of crucible 5, also avoided the time of adopting the stringent effort shutdown maintenance to incur loss through delay simultaneously.
Described heating wire 4 is fixed on the pull frame 6, can adopt the known fixed form of those skilled in the art.
Described heating wire 4 is preferably many and adopt the branch set of connections, and the break-make of power supply that like this can be by controlling every group of heating wire 4 is controlled the heating of electrothermal furnace, insulation, cooling etc., to guarantee suitable temperature.
Under the preferable case, heating wire 4 is selected electrothermal tube for use, and the material of described electrothermal tube and structure are that those skilled in the art are known, and be for example shown in Figure 4, described electrothermal tube comprises heating wire 4 and is enclosed within the pipe 10 of heating wire 4 outsides, and heating wire 4 and manage 10 between have electric insulation filler 9.So both guarantee operating efficiency, and made heating wire 4 have very long service life again.
As shown in Figure 3, described electrothermal tube is preferably the U-shaped electrothermal tube, is inserted in the described pull plate 6 and fixedly connected, adopts the U-shaped pipe can save installing space.
Embodiment
Present embodiment illustrates electrothermal furnace provided by the invention.
According to of the present invention, select for use resistance to be 30 ohm heating wire 4, stainless steel tube 10 that grade of steel is 0Cr25Ni20, to make the U-shaped electrothermal tube as electric insulation filler 9 with magnesia powder.Pull frame 6 its ends of selecting for use have heat-insulation layer 11, and the material of heat-insulation layer 11 is a mullite brick, and end cap 7 and pull frame 6 are welded as a whole, and then with in the hole on the end cap 7 of 15 above-mentioned U-shaped electrothermal tubes insertion pull framves 6, and form a fixed connection.
Three such pull framves 6 that are fixed with electrothermal tube are inserted in the electrothermal furnace by position shown in Figure 2, make it between crucible 5 and heat-insulation layer 2.
When wiring, choose a U-shaped electrothermal tube on each pull frame 6 as a heating unit, always have 15 heating units.After carefully connecting the wire,, realize all or part of heating unit work, reach 625 ± 5 ℃, amount to 8 hours times spent from beginning to be heated to the die casting machine operating temperature according to the temperature needs with the operating voltage energising of electrothermal tube with 220 volts.
Claims (9)
1. electrothermal furnace, comprise cover plate, shell, heat-insulation layer, heating wire and crucible, heat-insulation layer is fixed in the inwall of shell, crucible is fixed in the shell, wherein, also comprise the pull frame, described pull chord position also can be extracted out from described electrothermal furnace between crucible and heat-insulation layer, and described heating wire is fixed in this pull frame.
2. electrothermal furnace according to claim 1, wherein, described pull frame is a plurality of, be positioned at described crucible around.
3. electrothermal furnace according to claim 1, wherein, the end of described pull frame has heat-insulation layer.
4. electrothermal furnace according to claim 1, wherein, described pull frame has end cap, and this end cap is fixedly connected on pull frame outer end.
5. electrothermal furnace according to claim 4 wherein, also has handle on the described end cap.
6. electrothermal furnace according to claim 1, wherein, described heating wire is many and adopts the branch set of connections.
7. according to claim 1 or 6 described electrothermal furnaces, wherein, described heating wire is an electrothermal tube.
8. electrothermal furnace according to claim 7, wherein, described electrothermal tube is the U-shaped electrothermal tube.
9. the application of the described electrothermal furnace of one of claim 1-8 in magnesium alloy smelting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101055483A CN100458339C (en) | 2005-09-27 | 2005-09-27 | Electric heating furnace and its use |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101055483A CN100458339C (en) | 2005-09-27 | 2005-09-27 | Electric heating furnace and its use |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1940446A CN1940446A (en) | 2007-04-04 |
| CN100458339C true CN100458339C (en) | 2009-02-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005101055483A Active CN100458339C (en) | 2005-09-27 | 2005-09-27 | Electric heating furnace and its use |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100458339C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103134318A (en) * | 2011-12-05 | 2013-06-05 | 方强 | Crucible resistance furnace body capable of achieving internal heating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85201593U (en) * | 1985-04-01 | 1986-05-14 | 蔡伟忠 | Far infrared electric furnace |
| JPH08119662A (en) * | 1994-10-28 | 1996-05-14 | Fujikura Ltd | Heating furnace for drawing of optical fiber |
| JP2004071619A (en) * | 2002-08-01 | 2004-03-04 | Hitachi Kokusai Electric Inc | Substrate treating device |
-
2005
- 2005-09-27 CN CNB2005101055483A patent/CN100458339C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85201593U (en) * | 1985-04-01 | 1986-05-14 | 蔡伟忠 | Far infrared electric furnace |
| JPH08119662A (en) * | 1994-10-28 | 1996-05-14 | Fujikura Ltd | Heating furnace for drawing of optical fiber |
| JP2004071619A (en) * | 2002-08-01 | 2004-03-04 | Hitachi Kokusai Electric Inc | Substrate treating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1940446A (en) | 2007-04-04 |
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Effective date of registration: 20201208 Address after: North Park Hill Road 214500 Jingjiang city in Jiangsu province Taizhou City No. 18 Patentee after: Jiangdong Aerospace new materials (Jiangsu) Co., Ltd Address before: 518119 BYD Industrial Park, Yanan Road, Kwai Chung Town, Longgang District, Guangdong, Shenzhen Patentee before: BYD Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20211102 Address after: 214500 No. 18 Shannan Road, Chengbei Park, Jingjiang City, Taizhou City, Jiangsu Province Patentee after: Jingjiang City Huaxin Technology Park Co.,Ltd. Address before: 214500 No. 18 Shannan Road, Chengbei Park, Jingjiang City, Taizhou City, Jiangsu Province Patentee before: Jiangdong Aerospace new materials (Jiangsu) Co., Ltd |
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