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    • 2604/2704 碳勢控制表-溫度控制器

    2604/2704 碳勢控制表-溫度控制器

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    • 更新時間2020-11-20
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    上海阜立自動化科技有限公司是專業從事自動化控制產品的銷售、技術開發、工程成套、技術服務的綜合性高科技企業。主要涉足業務包括:碳勢控制系統、氮勢控制系統、溫度控制系統、擠出成型、壓力控制,張力控制、運動控制,收放卷控制。 多年來,公司注重于為生產、制造型企業提供高性價比、高穩定性的電氣系統解決方案和成套服務. 成功的為熱處理 滲碳爐、網袋爐、井式爐,退火爐、淬火爐、回火爐、電阻爐、臺車爐、箱式爐、真空爐等 、塑料加工擠塑流涎CPP/CPE/PVB/PVC/OPP/EVA/TPU、注塑、吹塑、片材、管材等、電線電纜護套、成纜、絞合、成圈等 、紡織化纖長絲、長絲后加工、短纖維、水針刺無紡布等 、金屬加工、印染、造紙機械、水泥生產、港口機械等眾多行業,提供電氣控制系統規化方案、設計成套、安裝調試等*服務. 為眾多的設備制造商提高了設備技術,在市場競爭中脫穎而出.獲得了規模性快速擴張.同時在專業技術上,我公司凝聚了一批的自動控制軟、硬件工程師和相關行業的材料、工藝等技.術專家.形成了多行業成熟的高、中、低檔的現場級設備層電氣控制系統解決方案.并形成了本公司*的快速響應服務機制. 本公司秉成“合作共贏、共同發展”的原則,熱誠期盼與廣大設備制造企業、技術同行的業務合作和技術交流,共同為我國從“世界制造大國”躍變為“世界制造強國”而努力!

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    2604/2704 碳勢控制表
    2604/2704 碳勢控制表-溫度控制器 產品詳情
    2604/2704 碳勢控制表

    2604/2704 碳勢控制表功能說明


    Carburising

    When Mild steels or certain low carbon steels are heated at temperatures above 900oC in a carbon rich atmosphere, the surface of the steel absorbs carbon by diffusion. The depth of carbon enrichment depends on the time and temperature of the treatment known as carburising. The presence of carbon in the steel causes a change in its physical properties. Accurate control of both temperature and carbon potential are needed to achieve the required profile of carbon enrichment.

    Zirconia Sensor Theory

    The Zirconia probe generates a millivolt signal based on the ratio of oxygen concentration between the reference airside of the probe (outside the furnace) and the amount of oxygen actually inside the furnace. Temperature is measured using a built in thermocouple at the tip of the probe. Together, these signals are used by the 2604 zirconia function block to calculate the actual percentage of carbon in the furnace atmosphere. The 2604 oxygen probe interface is compatible with most commonly used zirconia probes.

    2604 Integrated Furnace Controller

    Synchronised temperature/carbon profiles

    Automatic probe cleaning

    Furnace sooting alarm

    Probe deterioration alarm

    Temperature control of quench










    A 2604 three loop controller is used to control both furnace temperature, carbon potential and quench. In many batch furnace applications a setpoint programmer is used to generate temperature and carbon profiles which are synchronised to a common time base.

    Furnace Temperature Control

    Although the sensor input of the temperature loop can come from the zirconia probe, it is more common for a separate thermocouple to be used. The heat control output can either be connected to gas burners or thyristors. In some applications a cooling output may also be connected to a circulation fan or an exhaust damper.

    Furnace Atmosphere control

    In atmosphere loops the controller increases the carbon potential by opening a solenoid valve which allows a carburising gas (ie propane) to enter the furnace. Conversely, to decrease the carbon potential, air or nitrogen is introduced into the furnace. Automatic probe cleaning functions ensure that the reading is accurate, whilst probe health and sooting alarms warn of a deterioration in the probes performance.

    Quench Temperature Control

    Steel parts are rapidly cooled (Quenched) from around 850oC to obtain the desired hardness, strength or toughness. Depending on the material being treated, the quench medium is usually oil or water. The quench control loop maintains the quench bath at the desired temperature and provides a quench timer facility.

    Sooting Alarm

    As well as alarms on the temperature and carbon potential in the furnace the 2604 can trigger an alarm, when the atmospheric conditions are such that carbon will be deposited as soot on all surfaces inside the furnace, including the workpiece. Avoiding sooting protects the furnace lining, maintains the accuracy of the zirconia probe and stops formation of a soot barrier on the workpiece which can prevent carbon diffusion.

    Automatic Probe Cleaning

    The 2604 has a probe clean and recovery strategy that can be programmed to occur between batches or manually requested by an operator. A short blast of compressed air is used to remove any soot and other particles that may have accumulated on the probe. Once the cleaning has been completed the time taken for the probe to recover is measured. If the recovery time is too long this indicates that the probe is ageing and replacement or refurbishment is due. During the cleaning and recovery cycle, the %CP reading is frozen thereby ensuring continuous furnace operation.

    Enriching Gas Correction

    A gas analyser can be used to determine the CO concentration of the enriching gas. If an analogue output is available from the analyser, it can be fed into the 2604 to automatically adjust the calculated % carbon reading. Alternatively, an operator may enter this value manually.


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