Programmable fire-proof self-temperature-limiting electric tracing band control device

Abstract

The utility model discloses a programmable fire prevention type self-temperature-limiting electric tracing band control device. Comprising a control power supply unit, a PLC unit, a touch screen control unit, a voltage signal acquisition unit, a current signal acquisition unit, a temperature signal acquisition unit, a leakage protection unit, a contactor control unit, a relay control unit, a signal indication unit, a communication unit and an external power supply, the input end of the control power supply unit is connected with the L input end and the N input end of an external power supply. The device provided by the utility model realizes fault detection, protection and alarm functions of the self-temperature-limiting electric tracing band by collecting and processing temperature, voltage, current and other signals and combining a PLC control technology, an electric leakage protection technology and a touch screen man-machine interaction interface.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric power equipment, concretely is a programmable fire prevention type self-limiting temperature electric tracing band control device. BACKGROUND

[0002] With the continuous development of industrial production, especially in cold environments, pipes, valves, instruments and other equipment need to maintain a certain temperature range to ensure normal operation during long-term use. In such environments, self-limiting temperature electric tracing bands, as an efficient temperature control device, are widely used to prevent pipe cracking and ensure normal operation of equipment. However, despite the significant advantages of self-limiting temperature electric tracing bands in energy saving and temperature control, they have exposed many problems in long-term use, especially in safety and control accuracy.

[0003] Existing self-limiting temperature electric tracing bands usually rely on simple air switches for overload protection, but due to their high starting current, larger protection switches are often required, which cannot provide effective protection. Moreover, as the service life of self-limiting temperature electric tracing bands increases, insulation aging, installation defects and external damage can cause self-limiting temperature electric tracing bands to have safety hazards such as leakage, overload and short circuit. Since self-limiting temperature electric tracing bands are usually wrapped in insulation, traditional on-site inspection methods cannot effectively monitor the operating conditions of the equipment, and manual detection is inefficient and prone to missed detection. Therefore, how to improve the safety of self-limiting temperature electric tracing bands and improve fault detection efficiency has become a problem to be solved.

[0004] In the prior art, there is a lack of a dedicated control system / device to effectively manage self-limiting temperature electric tracing bands, and traditional control methods not only fail to effectively monitor temperature, current, voltage and other key parameters, but also cannot provide real-time equipment operating status or fault alarms. Therefore, it is particularly important to develop a programmable self-limiting temperature electric tracing band control device with fire prevention function. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a programmable fire prevention type self-limiting temperature electric tracing band control device, which improves the safety protection capability of self-limiting temperature electric tracing bands through intelligent and automated control methods, and reduces the pressure of manual inspection.

[0006] In order to achieve the above object, the utility model provides the following technical scheme: A programmable fireproof type self-limiting temperature electric heat tracing band control device, including control power unit, PLC unit, touch screen control unit, voltage signal acquisition unit, current signal acquisition unit, temperature signal acquisition unit, leakage protection unit, contactor control unit, relay control unit, signal indication unit, communication unit and external power supply, wherein the external power supply is a power module based on three-phase four-wire system, the input end of the control power unit is connected with the L input end and N input end of the external power supply, the output end of the control power unit is connected with the PLC unit, touch screen control unit, voltage signal acquisition unit, current signal acquisition unit and temperature signal acquisition unit, and the control power unit is used for receiving the input of the external power supply and outputting 24V direct current after internal processing.

[0007] Preferably, the PLC unit is connected with the voltage signal acquisition unit, current signal acquisition unit and temperature signal acquisition unit through analog input AI port, the PLC unit is used for receiving voltage, current and temperature signal input, the PLC unit is connected with the relay control unit through DO port, and the DI port of the PLC unit is connected with start, stop and reset buttons.

[0008] Preferably, the touch screen control unit is connected with the PLC unit through a communication interface, the touch screen control unit is used for providing a man-machine interactive interface, and a user can perform parameter setting, state monitoring and fault troubleshooting and the like through the touch screen.

[0009] Preferably, the voltage signal acquisition unit is connected with the input end of the external power supply through a voltage transmitter, is used for acquiring three-phase voltage signals, and converts the acquired voltage signals into standard signals such as 4-20mA or 0-10V and outputs to the PLC unit.

[0010] Preferably, the current signal acquisition unit is used for acquiring three-phase current signals, and converts the acquired current signals into standard signals such as 4-20mA or 0-10V and outputs to the PLC unit.

[0011] Preferably, the temperature signal acquisition unit is used for acquiring temperature signals, and converts the acquired temperature signals into standard signals and outputs to the PLC unit.

[0012] Preferably, the leakage protection unit is connected with the input end of the external power supply through a leakage switch, and the leakage protection unit automatically trips to cut off the power supply when detecting leakage.

[0013] Preferably, the contactor control unit is connected with the self-limiting temperature electric heat tracing band through a contactor.

[0014] Preferably, the relay control unit is connected with the PLC unit, is used for receiving control signals, and outputs the signals to the contactor control unit.

[0015] Preferably, the signal indicating unit is connected to the contactor control unit, the signal indicating unit is an indicating lamp, and the signal indicating unit is used to provide system state indication, facilitating user troubleshooting and state monitoring.

[0016] Preferably, the communication unit is connected to other devices or host computers outside the system through a communication interface, and the communication unit is used to realize data exchange and remote monitoring of the system and other devices or host computers.

[0017] Compared with the prior art, the utility model has the beneficial effects that:

[0018] The utility model discloses a control mode of intelligence, automation, improves the safety protection capability of self-limiting temperature electric heat tracing band, and reduces the pressure of artificial inspection simultaneously.

[0019] The specific technical effects include the following:

[0020] 1、The device provides protection for the self-limiting temperature electric heat tracing band from cold-state start to hot-state stable process.

[0021] 2、The device provides protection from hot state to continuous work.

[0022] 3、The protection during the starting process and after the completion of the device includes voltage, current, temperature, leakage, overload, short circuit and other protections.

[0023] 4、The device provides a friendly man-machine interface, and the operator can conveniently understand the real-time condition of the heat tracing band.

[0024] 5、Wide application range, the operator can set appropriate protection values according to the specific conditions of the self-limiting temperature electric heat tracing band on site, so that various fires caused by the self-limiting temperature electric heat tracing band are completely solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 It is the circuit schematic diagram of the utility model;

[0026] Fig. 2 It is the circuit diagram of the PLC unit in the embodiment of the utility model.

[0027] In the drawing:

[0028] 1、Control power supply unit;2、PLC unit;3、Touch screen control unit;4、Voltage signal acquisition unit;5、Current signal acquisition unit;6、Temperature signal acquisition unit;7、Leakage protection unit;8、Contactor control unit;9、Relay control unit;10、Signal indicating unit;11、Communication unit. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application.

[0030] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "vertical", "upper", "lower", "horizontal" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Please refer to Figs. 1-2 The present application provides a technical scheme: a programmable fireproof type self-limiting temperature electric heat tracing band control device, comprising a control power supply unit 1, a PLC unit 2, a touch screen control unit 3, a voltage signal acquisition unit 4, a current signal acquisition unit 5, a temperature signal acquisition unit 6, a leakage protection unit 7, a contactor control unit 8, a relay control unit 9, a signal indication unit 10, a communication unit 11 and an external power supply.

[0033] In the present embodiment, the external power supply is a power supply module based on three-phase four-wire system, the input end of the control power supply unit 1 is connected with the L1 input end and the N input end of the external power supply, and the output end of the control power supply unit 1 is connected with the PLC unit 2, the touch screen control unit 3, the voltage signal acquisition unit 4, the current signal acquisition unit 5 and the temperature signal acquisition unit 6, and the control power supply unit 1 is used for receiving the input of the external power supply and outputting 24V DC after internal processing.

[0034] Please refer to Fig. 2In the embodiment, the PLC unit 2 is connected with the voltage signal acquisition unit 4, the current signal acquisition unit 5 and the temperature signal acquisition unit 6 through the analog input AI port, the PLC unit 2 is used for receiving voltage, current and temperature signal input, the PLC unit 2 is connected with the relay control unit 9 through the DO port, and the DI port of the PLC unit 2 is connected with buttons (start, stop and reset buttons).

[0035] In the embodiment, the touch screen control unit 3 is connected with the PLC unit 2 through the communication interface, the touch screen control unit 3 is used for providing a man-machine interactive interface, and a user can perform parameter setting, state monitoring and fault troubleshooting and the like through the touch screen.

[0036] In the embodiment, the voltage signal acquisition unit 4 is used for acquiring three-phase voltage signals, and converting the acquired voltage signals into standard signals such as 4-20mA or 0-10V and outputting to the PLC unit 2.

[0037] In the embodiment, the current signal acquisition unit 5 is used for acquiring three-phase current signals, and converting the acquired current signals into standard signals such as 4-20mA or 0-10V and outputting to the PLC unit 2.

[0038] In the embodiment, the temperature signal acquisition unit 6 is connected with the self-limiting temperature electric heat tracing band through a temperature sensor such as PT100, PT1000 and the like, is used for acquiring temperature signals of the self-limiting temperature electric heat tracing band, and converting the acquired temperature signals into standard signals and outputting to the PLC unit 2, and the temperature signal acquisition unit 6 is used for over-temperature protection of the self-limiting temperature electric heat tracing band.

[0039] In the embodiment, the leakage protection unit 7 is connected with an external power input end through a leakage switch, and the leakage protection unit is automatically tripped when leakage is detected to cut off the power supply.

[0040] In the embodiment, the contactor control unit 8 is connected with the self-limiting temperature electric heat tracing band through a contactor.

[0041] In the embodiment, the relay control unit 9 is connected with the PLC unit 2, is used for receiving a control signal, and outputs the signal to the contactor control unit 8.

[0042] In the embodiment, the signal indication unit 10 is connected with the contactor control unit 8, the signal indication unit 10 is an indicating lamp, and the signal indication unit 10 is used for providing system state indication, facilitating the user to perform fault troubleshooting and state monitoring.

[0043] In the embodiment, the communication unit 11 is connected with other devices or an upper computer outside the system through a communication interface, and the communication unit 11 is used for realizing data exchange and remote monitoring of the system and other devices or the upper computer.

[0044] In combination with the above embodiments, the application also provides a running step of the control device, including the following:

[0045] (I) Power-on self-test:

[0046] Operation step: turn on the power, the system enters the self-test state, the PLC unit 2 and the touch screen will perform self-test to confirm that the hardware and system are working normally;

[0047] Processing result: if the self-test is passed, the user can select to start any phase; the user can operate by pressing the start button (one button for each phase) or selecting the corresponding start button through the touch screen;

[0048] (II) Start running:

[0049] PLC data processing: the PLC unit 2 receives voltage, current and temperature signals and performs real-time analysis, and according to the set control parameters, the PLC unit 2 calculates the running state of the self-limiting temperature electric heat tracing band;

[0050] Control execution: according to the control instructions of the PLC unit 2, the contactor control unit 8 controls the start and stop of the self-limiting temperature electric heat tracing band; the leakage protection unit 7 monitors the leakage situation to ensure the safety of the equipment;

[0051] Touch screen interaction: the user interacts with the system through the touch screen control unit 3; can set the working parameters, monitor the equipment state, view the fault information, etc.; the touch screen also displays real-time data such as voltage, current, temperature, system running state, etc., to help the user quickly locate the problem;

[0052] Remote monitoring and data exchange: the system realizes communication with external equipment or host computer through the communication unit 11, supports remote monitoring and data exchange, and the user can remotely view the system state.

[0053] (III) Fault handling:

[0054] Operation step: when the system detects that a fault (such as abnormal voltage, current) occurs in one of the three phases, the PLC unit 2 will receive the fault signal;

[0055] Processing result: the PLC unit 2 controls the relay to be disconnected, the relay controls the contactor to be disconnected, and the power supply of the self-limiting temperature electric heat tracing band is cut off;

[0056] State indication: the fault type, fault phase, fault time, fault alarm and other information will be displayed on the touch screen;

[0057] The fault will only affect the problematic phase, and the other normal phases can still work;

[0058] (IV) Stop operation:

[0059] Operation steps: when it is needed to stop the self-limiting temperature electric heat tracing band of a certain phase, the user can press the stop button or operate through the stop button on the touch screen;

[0060] Processing results: after the PLC receives the stop signal, the control relay is disconnected, and the contactor of the selected phase is also disconnected, cutting off the power supply of the self-limiting temperature electric heat tracing band of the phase;

[0061] (Five) fault recovery and reset:

[0062] Operation steps: after the fault is eliminated, the user needs to press the reset button or perform the reset operation on the touch screen;

[0063] Processing results: after the reset, the system returns to normal, and the user can restart the self-limiting temperature electric heat tracing band.

[0064] It is worth noting that: in the above embodiment, the DI port of the PLC is connected with the start button, the stop button and the reset button of each phase, and the functions of these buttons are to control the working state of the electric heat tracing band.

[0065] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A programmable fire-resistant self-regulating electric heating tape control device, characterized in that, It includes a control power supply unit (1), a PLC unit (2), a touch screen control unit (3), a voltage signal acquisition unit (4), a current signal acquisition unit (5), a temperature signal acquisition unit (6), a leakage current protection unit (7), a contactor control unit (8), a relay control unit (9), a signal indication unit (10), a communication unit (11), and an external power supply, wherein: The output terminal of the control power supply unit (1) is connected to the PLC unit (2), the touch screen control unit (3), the voltage signal acquisition unit (4), the current signal acquisition unit (5), and the temperature signal acquisition unit (6). The control power supply unit (1) is used to receive the input of external power and output 24V DC after internal processing. The touch screen control unit (3) is connected to the PLC unit (2) through a communication interface. The touch screen control unit (3) is used to provide a human-machine interface. The voltage signal acquisition unit (4) is connected to the input terminal of the external power supply through the voltage transmitter. It is used to acquire three-phase voltage signals and convert the acquired voltage signals into standard signals and output them to the PLC unit (2). The current signal acquisition unit (5) is used to acquire three-phase current signals and convert the acquired current signals into standard signals and output them to the PLC unit (2); Temperature signal acquisition unit (6) is used to acquire temperature signals and convert the acquired temperature signals into standard signals and output them to PLC unit (2); The leakage protection unit (7) is connected to the external power input terminal through a leakage switch; The contactor control unit (8) is connected to the self-regulating heating cable via a contactor; The relay control unit (9) is connected to the PLC unit (2) and is used to receive control signals and output signals to the contactor control unit (8); The signal indicator unit (10) is connected to the contactor control unit (8), and the signal indicator unit (10) is an indicator light; The communication unit (11) is connected to other devices or host computers outside the system through a communication interface. The communication unit (11) is used to realize data exchange and remote monitoring between the system and other devices or host computers.

2. The programmable fire-resistant self-regulating heating cable control device according to claim 1, characterized in that: The external power supply is a three-phase four-wire power module, and the input terminal of the control power unit (1) is connected to the external power supply.

3. The programmable fire-resistant self-regulating heating cable control device according to claim 1, characterized in that: The PLC unit (2) is connected to the voltage signal acquisition unit (4), the current signal acquisition unit (5), and the temperature signal acquisition unit (6) through the analog input AI port. The PLC unit (2) is used to receive voltage, current and temperature signal inputs. The PLC unit (2) is connected to the relay control unit (9) through the DO port.

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