CN103057099A - Temperature detection circuit for extruding machine cylinder - Google Patents
Temperature detection circuit for extruding machine cylinder Download PDFInfo
- Publication number
- CN103057099A CN103057099A CN201310005130XA CN201310005130A CN103057099A CN 103057099 A CN103057099 A CN 103057099A CN 201310005130X A CN201310005130X A CN 201310005130XA CN 201310005130 A CN201310005130 A CN 201310005130A CN 103057099 A CN103057099 A CN 103057099A
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- CN
- China
- Prior art keywords
- resistance
- operational amplifier
- pin
- detection circuit
- conversion chip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92361—Extrusion unit
- B29C2948/9238—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/924—Barrel or housing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Abstract
The invention discloses a temperature detection circuit for an extruding machine cylinder. A present extruding machines has the disadvantages of easy bubble generation, easy degradation, easy scorching, extrusion pressure fluctuation in the extrusion process, skidding of a plastic in the machine cylinder, unstable extrusion capacity, and uneven product external diameter. The temperature detection circuit comprises a K-type thermocouple, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sliding Rx1, a first operation amplifier (OPA2340) U1A, a second operation amplifier (OPA2340) U1B, an AD590 temperature sensor, and an ADS1115A/D conversion chip. The components adopted by the temperature detection circuit are manure and reliable, and have low costs and abundant sources. The temperature detection circuit has a cold junction compensation portion, and avoids the error caused by the temperature change of the cold junction of the K-type thermocouple. The test signal is amplified in isolation, so a good signal is provided for the A/D conversion.
Description
Technical field
The invention belongs to the industrial control technology field, relate to a kind of testing circuit, be specifically related to a kind of extruding machine temperature sensing circuit.
Background technology
Plastic extruder is widely used in mixing, filling and the extrusion molding of plastics, and its main body is screw rod, head and the multistage machine barrel that matches.In order to satisfy technologic demand, the temperature of every section machine barrel must keep constant and will have predetermined thermograde each other.Extrusion temperature directly affects the quality of rate of extrusion and extruded product, temperature cross low can't moulding or make the physical property of extruded product and apparent mass poor; Excess Temperature then easily produces bubble, degrades even burns, and also can cause extrusion pressure fluctuation in the extrusion, and plastics " skid " in machine barrel, and extrusion capacity is unstable, makes product external diameter size uneven, therefore must control the temperature of extrusion.
The industrial temperature of extruder barrel that requires keeps constant, and this just requires system to have higher tracking and control performance, needs the temperature of Real-time Collection machine barrel to carry out FEEDBACK CONTROL.
Summary of the invention
Purpose of the present invention is exactly for the high request of extruding machine to temperature, and a kind of temperature sensing circuit of extruder barrel is provided.
A kind of temperature sensing circuit of extruder barrel comprises K type thermocouple, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, slide rheostat Rx1, the first operational amplifier (OPA2340) U1A, the second operational amplifier (OPA2340) U1B, AD590 temperature sensor, ADS1115A/D conversion chip.
The cold junction of K type thermocouple is connected an end of an end, the first resistance R 1 and is connected with the positive input of the first operational amplifier U1A with temperature sensor AD 590.The other end of the first resistance R 1 is connected an end and is connected with slide rheostat Rx1.The other end of slide rheostat Rx1 and sliding end ground connection.Another termination of temperature sensor AD 590+5V power supply.The negative voltage side ground connection of the first operational amplifier U1A, positive voltage termination+5V power supply, an end of reverse input end, output and the 3rd resistance R 3 connects.The other end of K type thermocouple be connected an end of resistance R 2 and connect.The in the same way input of the other end of the other end of the second resistance R 2 and the 3rd resistance R 3, the second operational amplifier OPA2340 connects.One end of the reverse input end of the second operational amplifier OPA2340 and the 4th resistance R 4, an end of the 5th resistance R 5 connect the other end ground connection of the 4th resistance R 4.The other end of the 5th resistance be connected 4 pin of output, A/D conversion chip ADS1115 of operational amplifier OPA2340 and connect; 8 pin of A/D conversion chip ADS1115 connect+the 5V power supply, 3 pin ground connection, and 1 pin of A/D conversion chip ADS1115 and 10 pin are input signal terminal, and 9 pin are the output signal terminal, and all the other pins of A/D conversion chip ADS1115 are built on stilts.
Beneficial effect: the components and parts mature and reliable that the present invention adopts, with low cost, the source is abundant.The present invention has the cold junction compensation part, has avoided K type thermocouple cold junction to change the error that causes.Isolation is amplified to test signal, for the A/D conversion provides good signal.
Description of drawings
Fig. 1 is structural representation of the present invention.
The specific embodiment
Further specify the specific embodiment of the present invention below in conjunction with accompanying drawing.
As shown in Figure 1, the temperature sensing circuit of a kind of extruder barrel of the present invention comprises K type thermocouple, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, slide rheostat Rx1, the first operational amplifier (OPA2340) U1A, the second operational amplifier (OPA2340) U1B, AD590 temperature sensor, ADS1115A/D conversion chip.
The cold junction of K type thermocouple is connected an end of an end, the first resistance R 1 and is connected with the positive input of the first operational amplifier U1A with temperature sensor AD 590.The other end of the first resistance R 1 is connected an end and is connected with slide rheostat Rx1.The other end of slide rheostat Rx1 and sliding end ground connection.Another termination of temperature sensor AD 590+5V power supply.The negative voltage side ground connection of the first operational amplifier U1A, positive voltage termination+5V power supply, an end of reverse input end, output and the 3rd resistance R 3 connects.The other end of K type thermocouple be connected an end of resistance R 2 and connect.The in the same way input of the other end of the other end of the second resistance R 2 and the 3rd resistance R 3, the second operational amplifier OPA2340 connects.One end of the reverse input end of the second operational amplifier OPA2340 and the 4th resistance R 4, an end of the 5th resistance R 5 connect the other end ground connection of the 4th resistance R 4.The other end of the 5th resistance be connected 4 pin of output, A/D conversion chip ADS1115 of operational amplifier OPA2340 and connect; 8 pin of A/D conversion chip ADS1115 connect+the 5V power supply, 3 pin ground connection, and 1 pin of A/D conversion chip ADS1115 and 10 pin are input signal terminal, and 9 pin are the output signal terminal, and all the other pins of A/D conversion chip ADS1115 are built on stilts.
Temperature sensor AD 590 of the present invention and the first resistance R 1, slide rheostat Rx1 form the cold junction compensation circuit of K type thermocouple, guarantee the accuracy of measurement result.The first operational amplifier OPA2340 makes in the constant situation of output voltage as voltage follower, and sensor signal and amplifying circuit are realized isolation, have avoided mutual interference.The second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the second operational amplifier OPA2340 form amplifying circuit, the thermo-electromotive force of K type thermocouple is amplified, and with A/D conversion chip ADS1115 isolation, for the A/D conversion provides good signal.A/D conversion chip ADS1115 becomes analog signal conversion data signal to offer the CPU processing.
Claims (1)
1. the temperature sensing circuit of an extruder barrel comprises K type thermocouple, the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, slide rheostat Rx1, the first operational amplifier U1A, the second operational amplifier U1B, AD590 temperature sensor, ADS1115A/D conversion chip;
It is characterized in that: the cold junction of K type thermocouple is connected an end of an end, the first resistance R 1 and is connected with the positive input of the first operational amplifier U1A with temperature sensor AD 590; The other end of the first resistance R 1 is connected an end and is connected with slide rheostat Rx1; The other end of slide rheostat Rx1 and sliding end ground connection; Another termination of temperature sensor AD 590+5V power supply; The negative voltage side ground connection of the first operational amplifier U1A, positive voltage termination+5V power supply, an end of reverse input end, output and the 3rd resistance R 3 connects; The other end of K type thermocouple be connected an end of resistance R 2 and connect; The in the same way input of the other end of the other end of the second resistance R 2 and the 3rd resistance R 3, the second operational amplifier OPA2340 connects; One end of the reverse input end of the second operational amplifier OPA2340 and the 4th resistance R 4, an end of the 5th resistance R 5 connect the other end ground connection of the 4th resistance R 4; The other end of the 5th resistance be connected 4 pin of output, A/D conversion chip ADS1115 of operational amplifier OPA2340 and connect; 8 pin of A/D conversion chip ADS1115 connect+the 5V power supply, 3 pin ground connection, and 1 pin of A/D conversion chip ADS1115 and 10 pin are input signal terminal, and 9 pin are the output signal terminal, and all the other pins of A/D conversion chip ADS1115 are built on stilts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310005130XA CN103057099A (en) | 2013-01-06 | 2013-01-06 | Temperature detection circuit for extruding machine cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310005130XA CN103057099A (en) | 2013-01-06 | 2013-01-06 | Temperature detection circuit for extruding machine cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103057099A true CN103057099A (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310005130XA Pending CN103057099A (en) | 2013-01-06 | 2013-01-06 | Temperature detection circuit for extruding machine cylinder |
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| CN (1) | CN103057099A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568194A (en) * | 2014-11-18 | 2015-04-29 | 无锡悟莘科技有限公司 | Temperature transducer circuit adopting operational amplifier as voltage follower |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4157663A (en) * | 1978-04-25 | 1979-06-12 | The Boeing Company | Automatic thermocouple reference junction compensator |
| CN2514952Y (en) * | 2001-12-19 | 2002-10-09 | 中国科学院金属研究所 | Temperature field automatic collection device of single crystal high temperature directional solidification process |
| CN201096544Y (en) * | 2007-10-26 | 2008-08-06 | 宁波海天北化科技有限公司 | Injection moulding machine controller temperature signal conversion measuring circuit |
-
2013
- 2013-01-06 CN CN201310005130XA patent/CN103057099A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4157663A (en) * | 1978-04-25 | 1979-06-12 | The Boeing Company | Automatic thermocouple reference junction compensator |
| CN2514952Y (en) * | 2001-12-19 | 2002-10-09 | 中国科学院金属研究所 | Temperature field automatic collection device of single crystal high temperature directional solidification process |
| CN201096544Y (en) * | 2007-10-26 | 2008-08-06 | 宁波海天北化科技有限公司 | Injection moulding machine controller temperature signal conversion measuring circuit |
Non-Patent Citations (2)
| Title |
|---|
| 吕勇军: "《传感器技术实用教程》", 31 January 2012, article "冷端温度自动补偿法" * |
| 王健生等: "《电路分析与应用基础》", 31 December 2007, article "电压跟随器" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104568194A (en) * | 2014-11-18 | 2015-04-29 | 无锡悟莘科技有限公司 | Temperature transducer circuit adopting operational amplifier as voltage follower |
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Application publication date: 20130424 |