CN101067613A - Sensor for metal liquid comprehensive performance on-line detection - Google Patents
Sensor for metal liquid comprehensive performance on-line detection Download PDFInfo
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- CN101067613A CN101067613A CN 200610002851 CN200610002851A CN101067613A CN 101067613 A CN101067613 A CN 101067613A CN 200610002851 CN200610002851 CN 200610002851 CN 200610002851 A CN200610002851 A CN 200610002851A CN 101067613 A CN101067613 A CN 101067613A
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Abstract
The invention relates to a molten metal synthesis performance on-line examination used sensor, which includes the cup body (1) and the thermo-element (3, 2, 2'), the thermo-element crosses the cup body which is used to produce electrical signal which is related to the molten metal temperature change, the invention characteristic lies in: the thermo-element surrounds by the fire resistant splice case, and its position in the cup body is in the 1/2-2/3 of cup body height; in the cup body wall and the bottom surface includes a coating level (4)which contains tellurium Te, bismuth Bi and aluminum Al. The invention sensor has width survey scope, high precision and good stable merit.
Description
Affiliated technical field
The present invention relates to a kind of sensor for metal liquid comprehensive performance on-line detection, when this sensor is used for detecting in the metal liquid comprehensive performance stokehold, the cooling characteristics of molten metal is converted to electric signal.
Background technology
Foundry industry is the basis of machinery manufacturing industry, and in order to improve casting quality, the detection of foundry goods combination property is a key issue.The detection of combination property not only should comprise such as the detection of chemical constitutions such as carbon content, silicone content, also should comprise such as physical parameters such as intensity, hardness, length growth rate, nodularization rate, carbonide and detecting.It is after casting is finished sample or foundry goods to be carried out (section) analysis that traditional foundry goods detects, and this detection is called offline inspection.Development along with thermoanalysis technology, realize the stokehold fast detecting of metal liquid comprehensive performance all sidedly, active demand and development trend that foundry goods detects have been become, because the every index that can in time judge molten metal is detected in this stokehold, thereby control casting quality by composition or technology adjustment before casting, therefore this stokehold is detected and is called online detection.Online detection obtains various physicochemical property data and only needs a few minutes from being sampled to, and has good application prospects.The metal liquid comprehensive performance online detection instrument mainly comprises sensor and two parts of signal processing apparatus, scope, stability and the precision important influence of the performance of sensor to detecting.
The sensor of the online detection usefulness of metal liquid comprehensive performance (cup-shaped usually, so be also referred to as the sample cup) is used in testing process, is electric signal with the temperature variation conversion of signals that pours into the molten metal sample in it.After the molten metal (as molten iron) of sampling pours into sensor, the temperature of molten metal can be fallen after rising, the two ends that are in the thermopair of molten metal among surrounding just produce the thermoelectrical potential signal, this signal can obtain the time dependent curve of molten metal temperature through handling, be the cooling curve of molten metal, can determine the multiple physical and chemical parameter of molten metal according to this curve.
Existing metal liquid comprehensive performance detects and has following shortcoming with sensor: (1) intensity difference, the damaged in collision or the spalling of being heated easily; (2) gas forming amount is big, after high-temperature liquid metal pours into sensor, overflows a large amount of gases in the sensor cup and causes the molten metal disturbance and splash feasible test instability; (3) hydroscopicity is strong, and after molten metal poured into sensor, a large amount of steam caused the molten metal disturbance and splashes, and causes test to be difficult to carry out; (4) " hot analysis platform ability " (forming the ability of platform on the cooling curve) is poor, and checkout equipment is looked for the unique point of being forbidden even can not find cooling curve, causes test crash; (5) " hot analysis platform ability " instability, or thermal inertia is big, and the parameter great disparity, the test confidence level that cause bad, the same molten iron of reappearance to record are poor; (6) the test susceptibility of solidus temperature Ts is poor; (7) test specification is narrow, function is few, parameter is few, low precision.
Summary of the invention
The objective of the invention is in order to overcome the shortcoming of existing sensor for metal liquid comprehensive performance on-line detection, a kind of improved sensor is provided, and this improved sensor convenient transportation and storage, test are reliably, test specification is wide, test parameter is many, measuring accuracy is high, antijamming capability is strong.
The above-mentioned shortcoming of existing sensor is caused by many-sided reason, for example the structure of sensor cup and coat and test environment (comprising dust, electromagnetic interference (EMI), vibration influence) etc.The present inventor finds that through a large amount of tests the performance of sensor itself plays main influence to testing result.
For this reason, sensor for metal liquid comprehensive performance on-line detection of the present invention comprises cup and thermopair, cup is cup-shaped, be used to pour into molten metal to be detected, the thermopair level is crossed cup, so that surrounded by the molten metal in the cup, thereby produce the electric signal relevant with the temperature variation of molten metal, the invention is characterized in: on the inwall of cup and bottom surface, comprise a dope layer, dope layer is tellurium Te, the powder of bismuth Bi and aluminium Al be coated on cup after bonding agent mixes and form, wherein, tellurium, total addition of bismuth and aluminium is no less than 0.02% of the molten metal weight of containing in the cup, and tellurium, bismuth and the aluminium ratio of weight and three's sum separately are tellurium 〉=60%, bismuth≤30%, aluminium≤10%.Thermopair by resistant to elevated temperatures protective casing around, and the position of thermopair in cup be in cup height 1/2～2/3 between.
The invention has the beneficial effects as follows: the cup thermal resistance is big, hot erosion that can the withstand high temperatures molten metal, and intensity is good, the anti-moisture absorption; The thermal inertia that thermopair presents is little, the temperature signal of faint variation under the high temperature can be converted to high-precision thermoelectrical potential signal rapidly; Measurement range is wide, reappearance and reliability height.
Description of drawings
The present invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is the cut-open view of sensor for metal liquid comprehensive performance on-line detection of the present invention.
Among Fig. 1, the implication of each label is: the 1-cup, 2,2 '-thermocouple wire, 3-protective casing, 4-dope layer.
Embodiment
As shown in fig. 1, sensor for metal liquid comprehensive performance on-line detection of the present invention comprises cup 1 and thermopair.The cup cup-shaped that is square is used to pour into molten metal to be detected.The thermopair level is crossed cup, so that surrounded by the molten metal in the cup, thereby produces the electric signal relevant with the temperature variation of molten metal.Thermopair is by the accurate thermocouple wire 2,2 of K type ' be formed by connecting by high temperature spot welding, thermocouple wire 2,2 ' be respectively Ni-Cr and Ni-Si, and their free end is drawn by the locating slot of bottom of cup.Thermopair by resistant to elevated temperatures protective casing 3 around, one the test example in, the thermocouple wire diameter is less than 0.5mm, the internal diameter of protective casing is not more than 1.5mm, the position of thermopair in cup is in 2/3 place of cup height.In another test example, the position of thermopair in cup is in 1/2 place of cup height.Cup is that raw material adopts core shooter to form with the precoated sand, and precoated sand adopts resistant to elevated temperatures precoated sand, its tensile strength greater than 2.50Mpa, granularity less than 20 orders.On the inwall of cup and bottom surface, comprise a dope layer 4, dope layer is the powder of tellurium Te, bismuth Bi and aluminium Al with to be coated on cup after bonding agent evenly mixes inboard and form, wherein, total addition of tellurium, bismuth and aluminium is no less than 0.02% of the molten metal weight of containing in the cup, in a test example, tellurium, bismuth and the aluminium ratio of weight and three's sum separately are that tellurium is 60%, and bismuth is 30%, and aluminium is 10%.In another test example, tellurium, bismuth and the aluminium ratio of weight and three's sum separately are that tellurium is 70%, and bismuth is 25%, and aluminium is 5%.
Claims (3)
1, a kind of sensor for metal liquid comprehensive performance on-line detection, comprise cup and thermopair, cup is cup-shaped, be used to pour into molten metal to be detected, thermopair by resistant to elevated temperatures protective casing around and level cross cup so that surrounded, thereby produce the electric signal relevant with the temperature variation of molten metal by the molten metal in the cup, it is characterized in that: thermopair is horizontal positioned in cup, be in cup height 1/2～2/3 between; Comprise a dope layer on the inwall of cup and bottom surface, dope layer comprises tellurium Te, bismuth Bi and aluminium Al.
2, according to the sensor for metal liquid comprehensive performance on-line detection of claim 1, it is characterized in that: the cup cup-shaped that is square.
3, according to the sensor for metal liquid comprehensive performance on-line detection of claim 1 or 2, it is characterized in that: total addition of tellurium, bismuth and aluminium is no less than 0.02% of the molten metal weight of containing in the cup in the dope layer, and tellurium, bismuth and aluminium separately the ratio of weight and three's sum be tellurium 〉=60%, bismuth≤30%, aluminium≤10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100028515A CN100507534C (en) | 2006-02-07 | 2006-02-07 | Sensor for metal liquid comprehensive performance on-line detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100028515A CN100507534C (en) | 2006-02-07 | 2006-02-07 | Sensor for metal liquid comprehensive performance on-line detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101067613A true CN101067613A (en) | 2007-11-07 |
| CN100507534C CN100507534C (en) | 2009-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2006100028515A Expired - Fee Related CN100507534C (en) | 2006-02-07 | 2006-02-07 | Sensor for metal liquid comprehensive performance on-line detection |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101621A (en) * | 2014-07-18 | 2014-10-15 | 青岛理工大学 | Simple test device and method for nuclear power sacrificial concrete high-temperature corrosion |
| CN107144595A (en) * | 2017-06-06 | 2017-09-08 | 南昌大学 | Thermocouple and the repeatable cast aluminium alloy gold Sampling device for thermal analysis utilized of sampling cup |
| CN109991262A (en) * | 2019-04-26 | 2019-07-09 | 南京钢铁集团盛达实业有限公司 | A kind of rectangular sample cup for thermal analysis of dedicated molten iron of carbon equivalent high |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2638298B2 (en) * | 1990-05-16 | 1997-08-06 | 株式会社メテック | A method for determining the carbon equivalent, carbon content and silicon content of cast iron, as well as predicting its physical and mechanical properties |
| CN1267827A (en) * | 2000-03-24 | 2000-09-27 | 上海交通大学 | Chiling metal material for cast iron thermal-analysis sample cup and its adding method |
| CN1125333C (en) * | 2000-03-24 | 2003-10-22 | 上海交通大学 | Manufacture of cast iron sample cup for thermal analysis |
-
2006
- 2006-02-07 CN CNB2006100028515A patent/CN100507534C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101621A (en) * | 2014-07-18 | 2014-10-15 | 青岛理工大学 | Simple test device and method for nuclear power sacrificial concrete high-temperature corrosion |
| CN107144595A (en) * | 2017-06-06 | 2017-09-08 | 南昌大学 | Thermocouple and the repeatable cast aluminium alloy gold Sampling device for thermal analysis utilized of sampling cup |
| CN107144595B (en) * | 2017-06-06 | 2023-09-01 | 南昌大学 | Cast aluminum alloy thermal analysis sampling device with reusable thermocouple and sampling cup |
| CN109991262A (en) * | 2019-04-26 | 2019-07-09 | 南京钢铁集团盛达实业有限公司 | A kind of rectangular sample cup for thermal analysis of dedicated molten iron of carbon equivalent high |
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| CN100507534C (en) | 2009-07-01 |
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