Pipeline heating belt system

Abstract

The invention provides a pipeline heating belt system, relates to the technical field of industrial temperature control, comprises a control cabinet, a PID controller and a heating belt, and solves the problems of low temperature control precision, insufficient safety protection and complex operation of a traditional heating system. The control cabinet integrates an Omron PLC and a Schneider low-voltage electric appliance, supports 4-8 paths of independent temperature control, and realizes machine number setting, channel parameter one-key configuration and real-time alarm monitoring through a touch screen; the PI D controller adopts a K-type thermocouple to communicate with an RS485 and has an automatic calculation function, and the temperature control precision is + / -1 DEG C; the heating belt is internally provided with a nickel-chromium alloy heating wire and a double-safety protection device, the outer layer is a silicon coating fiber cloth and high-silica needled pad heat preservation layer, and wide-temperature operation of-10 DEG C to 260 DEG C is supported. Independent temperature control and flexible expansion are achieved through a multi-channel modular framework, the heating out-of-control risk is reduced through a double-safety mechanism, and the parameter debugging efficiency is improved through touch screen man-machine interaction.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial temperature control, and more particularly, relates to a pipeline heating belt system. Background Art

[0002] In industries such as petrochemicals, biopharmaceuticals, and new energy, pipeline temperature control is crucial for ensuring production process stability and safety. With the increasing demand for refined production in high-end equipment manufacturing, pipeline heating systems must meet requirements such as multi-channel independent temperature control, high-precision regulation, and adaptability to complex environments. Traditional heating systems often use single-channel relay control or simple PID control, which presents the following core issues: First, temperature control accuracy is insufficient, with temperature fluctuations exceeding ±5°C, making them unable to meet the precise heating requirements of biopharmaceutical reaction pipelines (which require within ±2°C) or new energy battery liquid cooling pipelines (which require ±1°C). Second, safety protection mechanisms are limited, relying solely on fuses or single-point temperature switches, lacking multi-level protection and fault warnings. This poses a high risk of pipe bursts or fires in the event of uncontrolled heating. Third, operation and maintenance are complex, requiring manual adjustment of PID parameters for each unit, and lacking real-time monitoring and data traceability, resulting in high energy consumption and maintenance costs. For example, traditional heating belts have a heating rate of only 3°C / min at -10°C, and surface temperature uniformity exceeds ±5°C, making them difficult to operate stably under extreme operating conditions.

[0003] The limitations of existing technologies further highlight the pain points of the industry. On the one hand, it is difficult to independently control each channel in a multi-pipe system. Traditional control cabinets use a unified power switch, which cannot realize single-channel start and stop and independent parameter configuration, resulting in mutual interference between the heating processes of different media pipelines; on the other hand, safety design lags behind actual needs. For example, the communication between the heating belt and the control cabinet is susceptible to electromagnetic interference (EMI), resulting in data distortion, and the lack of reliability of the plug connection (tension <30N) causes poor contact, which in turn causes heating out of control. In addition, in high temperature and high vibration environments (such as oil platforms and automobile production lines), the insulation layer of traditional heating belts is prone to aging (lifespan <1 year) and the Velcro viscosity decays (adhesion <2N / cm), resulting in increased heat loss and installation displacement, further affecting the temperature control accuracy and system life.

[0004] With the promotion of the "dual carbon" policy and the transformation of industrial intelligence, high-precision and high-reliability pipeline heating systems have become a rigid demand. The heating of new energy vehicle battery packs needs to maintain an accuracy of ±1°C in the temperature cycle of -40°C to 85°C to ensure the battery charging and discharging efficiency; the heating of gas pipelines in semiconductor wafer manufacturing needs to control the surface temperature uniformity error to ≤±2°C to avoid material denaturation due to local overheating. However, domestic existing technologies have technical gaps in multi-channel independent temperature control, intelligent safety protection and adaptation to complex scenarios. Although imported equipment can meet some needs, it is expensive (150% premium over domestic solutions) and has a long maintenance cycle, making it difficult to achieve large-scale application. Therefore, there is an urgent need for a new pipeline heating belt system that integrates "precise temperature control, intelligent interaction, and dual protection" to break the monopoly of foreign technology and meet the stringent requirements for temperature control in the high-end manufacturing field. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention provides a pipeline heating belt system to solve the above problems.

[0006] A pipeline heating belt system includes a control cabinet, a PID controller and a heating belt, wherein the control cabinet is connected to the PID controller via an RS485 communication module, and the PID controller is electrically connected to the heating belt;

[0007] The control cabinet includes:

[0008] Control system: includes Omron CPU, DI module, DO module and RS485 communication module, collects the switch status of the computer room, the temperature signal of each channel (PV value) and the on-off status of the circuit breaker at a frequency of 100ms / time, and realizes 4-8 independent temperature control through preset logic algorithm;

[0009] Low-voltage electrical appliances: including Schneider circuit breakers and contactors. The main circuit breaker QF0 serves as the master switch, and the branch circuit breakers QF1-QF8 correspond to the 1-8 heating belts, with 13A±5% overcurrent trip protection and leakage monitoring functions;

[0010] Operation panel: Includes touch screen, power indicator, buzzer and reset button. The touch screen supports machine number setting, one-click configuration of channel parameters (SV / ALH / ALL) and real-time alarm monitoring, and built-in three-level permission management (operation / maintenance / administrator).

[0011] Preferably, the DO module of the control cabinet controls the contactors KM1-KM8 through the intermediate relays KA1-KA8 to realize the on-off logic control of the power supply to the 1-8 heating belts:

[0012] The single heating belt circuit is equipped with 10A fast fuse FU1-FU8, which will blow within 10ms when the current exceeds 1.5 times the rated value;

[0013] A three-level electrical protection mechanism of "shunt circuit breaker (overcurrent protection) - fuse (fast blow) - contactor (on-off control)" is formed.

[0014] Preferably, the touch screen operation interface integrates multi-layer interactive logic:

[0015] Main screen: Real-time display of each channel's PV value, start / stop status, power ratio, and dynamic channel number setting (4-8 channels), supporting entry and query of PM maintenance records;

[0016] Parameter display screen: Synchronously displays the set temperature (SV value), high temperature alarm threshold (ALH), low temperature alarm threshold (ALL), and provides 24-hour temperature curve and fluctuation trend analysis;

[0017] Parameter setting screen: By pressing the "Write All Confirm" button, the SV, ALH, and ALL parameters will be synchronized to all PID controllers within 30 seconds. Single-channel independent configuration and multi-channel batch writing are supported, and the parameter step size is 1°C.

[0018] Preferably, the PID controller collects temperature signals through a K-type thermocouple, realizes data interaction based on RS485 communication, and has a built-in automatic calculation algorithm (TUN=1):

[0019] Dynamically optimize the proportional band (P), integral time (I), and differential time (D) to achieve a temperature control accuracy of ±1°C and a steady-state power ratio of ≤30% (at 180°C).

[0020] Supports adjustable baud rate of 9600 / 19200 / 38400bps, communication protocol compatible with ModbusRTU, and data sampling period of 50ms;

[0021] Safety signals (such as emergency stop and door lock signals) are transmitted via dual-channel coding, while non-safety signals (such as voltage values and weighing values) are transmitted via single channel, with an anti-electromagnetic interference design.

[0022] Preferably, the heating belt comprises:

[0023] Heating body: nickel-chromium alloy heating wire is set inside, the outer layer is covered with silicon-coated fiber cloth, and the middle layer is a high-silicon oxide needle-punched pad insulation layer;

[0024] Safety protection device: including temperature switch (thermoswitch) and thermal fuse (thermofuse), which disconnect the heating power supply in sequence when the temperature exceeds the set threshold.

[0025] Preferably, AMP quick connectors are set at both ends of the heating belt, hole 1 (red line) and hole 2 (black line) are connected to the 208VAC power supply, and hole 3 (yellow line) and hole 4 (blue line) are connected to the RS485 communication line (A+ / B-).

[0026] Preferably, the control cabinet startup process includes:

[0027] Close the main circuit breaker QF0 and confirm that the power indicator light is on;

[0028] Set the machine number and number of channels on the touch screen, and configure the PID controller parameters (SV, ALH, ALL) for each channel;

[0029] Start each channel contactor in turn, monitor the PV value and SV value through the touch screen to ensure that a stable temperature control state is achieved within 30 minutes.

[0030] Preferably, the touch screen alarm function includes:

[0031] High temperature alarm: triggered when PV value > SV value + ALH value;

[0032] Low temperature alarm: triggered when PV value < SV value + ALL value;

[0033] Communication failure: triggered when the PID controller loses power or the RS485 signal is interrupted;

[0034] TC disconnect alarm: Triggered when the thermocouple connection wire is disconnected.

[0035] Preferably, the heating belt material includes:

[0036] The inner and outer fabrics are both made of silicone-coated fiber fabrics, and the sewing threads are made of PTFE or glass fiber.

[0037] The Velcro is made of fire-retardant and high-temperature resistant material and is used to fix the heating belt to the periphery of the pipeline. The fitting tightness error is ≤2mm.

[0038] Preferably, the system supports 4-8 independent temperature control channels, with a single input voltage of 100-240VAC, a loop current ≤13A, an operating temperature range of 120℃-180℃ (maximum ≤260℃), and a temperature uniformity error ≤±2℃.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The system supports 4-8 independent temperature control channels, with each channel equipped with an independent PID controller and Schneider low-voltage protection unit. Data synchronization and logic control are achieved through an Omron PLC. The system offers a temperature control accuracy of ±1°C and a uniformity error of ≤±2°C, meeting the differentiated heating needs of multiple pipelines in fields such as petrochemicals and biomedicine. For example, during steady-state operation at 150°C, the circumferential temperature difference in the pipeline is ≤2°C, significantly superior to the ±5°C fluctuation level of traditional single-channel systems, ensuring medium temperature stability.

[0041] 2. The heating belt features a built-in temperature switch (operates at 200°C) and a thermal fuse (opens at 260°C), providing dual protection: "active power-off - ultimate fuse." With a response time of less than 2 seconds, this provides 50% greater reliability than traditional single-stage protection. Combined with the control cabinet's shunt circuit breaker (overcurrent trip threshold 13A ± 5%) and fuse (10A fast-blow), this provides a three-level safety protection system: "power input - heating circuit - terminal device," effectively preventing fires and equipment damage caused by uncontrolled heating.

[0042] 3. The touch screen supports one-touch parameter setting (SV / ALH / ALL), automatic calculation (AT function), and 30-day alarm record query, improving operational efficiency by 60% compared to traditional push-button control. For example, the "Write All Confirm" button can synchronize the parameters of 8 PID controllers within 30 seconds, eliminating the time-consuming and error-prone manual debugging of each controller. In the event of a fault, a buzzer and a flashing interface alarm are activated, and combined with alarm code analysis (such as TC disconnection and communication failure), maintenance and troubleshooting time is reduced to less than 5 minutes.

[0043] 4. The control cabinet utilizes standardized terminals (X11 for power supply and X12 for communication) and expandable DI / DO modules, supporting 4-8 channel combinations and adjustable pipe diameters from 50-200mm. For example, in heating the liquid cooling pipes of new energy batteries, the SV values for different channels (120°C / 150°C / 180°C) can be quickly set via the touchscreen. Velcro (adhesion ≥ 5N / cm) allows for quick installation and removal of the heating tape, reducing installation time for a single system by 40% compared to traditional customized solutions.

[0044] 5. Connecting to the CMS host computer via RS485 communication, the system uploads PV / SV values, alarm records, and operation logs (such as PM maintenance time and parameter modification records) in real time, supporting remote access and big data analysis. For example, in oil platform applications, the cloud platform can monitor the operating status of 200 heating belt systems, predicting potential faults such as thermocouple aging (increased TC disconnection alarm frequency), transforming reactive maintenance into preventive maintenance and reducing equipment downtime by 35%.

[0045] 6. The PID controller's automatic calculation function (TUN = 1) dynamically optimizes P / I / D parameters, reducing the steady-state power ratio to 30% (e.g., energy consumption is 0.5 kWh / circuit at 180°C), saving 40% energy compared to fixed-power heating. Furthermore, the aging-resistant design of the silicone-coated fiber cloth and fire-resistant Velcro (no rust after 240 hours of salt spray testing, Velcro life ≥ 2 years) extends the heater replacement cycle to twice that of traditional products, reducing overall lifecycle costs.

[0046] 7. The operation panel features a buzzer switch and reset button, enabling quick alarm silencing and fault reset. A high-temperature warning sign is printed on the heating belt surface, reducing the risk of burns by 70% with the "power off, temperature measurement, and operation" safety process. Furthermore, initial password protection (8888) and permission management prevent unauthorized operation, complying with ISO13849 machinery safety standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 Schematic diagram of the system structure of the present invention;

[0048] Figure 2 It is the touch screen startup screen of the present invention;

[0049] Figure 3 It is the main page displayed on the touch screen in the present invention;

[0050] Figure 4 It is the parameter display screen displayed on the touch screen in the present invention;

[0051] Figure 5 It is the parameter setting screen displayed on the touch screen in the present invention;

[0052] Figure 6 It is the alarm viewing screen displayed on the touch screen in the present invention;

[0053] Figure 7 It is the historical alarm screen displayed on the touch screen of the present invention;

[0054] Figure 8 It is the operation record screen displayed on the touch screen of the present invention;

[0055] Figure 9 It is the PM screen displayed on the touch screen in the present invention;

[0056] Figure 10 It is the login password screen displayed on the touch screen in the present invention;

[0057] Figure 11 This is an introduction to the Pin wiring of the PID controller in this invention;

[0058] Figure 12 This is the operation introduction of the PID controller in this invention Figure 1 ;

[0059] Figure 13 This is the operation introduction of the PID controller in this invention Figure 2 ;

[0060] Figure 14 This is the operation introduction of the PID controller in this invention Figure 3 . DETAILED DESCRIPTION

[0061] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0062] See also Figures 1-14 The present invention provides a pipeline heating belt system, which is suitable for pipeline heating scenarios in the fields of petrochemical industry, biomedicine, new energy, etc. Through the coordinated work of the control cabinet, PID controller and heating belt, multi-channel independent temperature control, safety protection and intelligent operation are realized.

[0063] System core architecture and working principle:

[0064] (1) System composition:

[0065] The pipeline heating belt system consists of a control cabinet, a PID controller, and a heating belt. Data exchange and control are achieved through the RS485 bus. The control cabinet serves as the hub, responsible for logic control and status monitoring; the PID controller implements single-channel temperature closed-loop regulation; and the heating belt acts as the execution unit, using nickel-chromium alloy wire heating and a supplementary insulation layer to achieve uniform heating of the pipeline. The system supports 4-8 independent temperature control channels, a single input voltage of 100-240VAC, an operating temperature range of 120°C-180°C (maximum tolerance of 260°C), a temperature control accuracy of ±1°C, and a uniformity error of ≤±2°C.

[0066] (2) Core control logic:

[0067] Data acquisition: K-type thermocouple collects the surface temperature (PV value) of the heating belt in real time and transmits it to the PID controller and control cabinet PLC module via RS485.

[0068] Closed-loop regulation: The PID controller automatically adjusts the output power (proportional band P = 200, integral time I = 50s, differential time D = 1000s) according to the deviation between the set temperature (SV value) and the PV value, and controls the on and off of the heating wire through the contactor.

[0069] Safety protection: The temperature switch (thermoswitch) disconnects the main circuit when the temperature exceeds the limit, and the thermal fuse (thermofuse) acts as the ultimate protection to blow the circuit and prevent heating out of control.

[0070] Detailed implementation of control cabinet:

[0071] (1) Hardware configuration and circuit design:

[0072] 1. Control system:

[0073] Core components:

[0074] CPU module: Omron CP1 H-XA40DT-D, supports RS485 communication and logic control, and has a data acquisition frequency of 100ms / time.

[0075] DI / DO module: Omron XW2B-32G4, 8 digital inputs (DI) for detecting circuit breaker status, 8 digital outputs (DO) for controlling contactors KM1-KM8 via intermediate relays KA1-KA8.

[0076] Communication module: Omron RS485-BD, each heating belt is independently assigned a communication address (1-8), and the baud rate supports 9600 / 19200 / 38400bps adjustable.

[0077] Terminal blocks:

[0078] X11: Power supply terminal, outputs AC208V to the heating belt AMP plug (holes 1 and 2).

[0079] X12: RS485 communication terminal, connected to the A+ / B- interface of the PID controller (holes 3 and 4). The communication cable uses a shielded twisted pair cable with an impedance of 120Ω and a transmission distance of ≤500m.

[0080] 2. Low voltage electrical system:

[0081]

[0082] (2) Operation panel and touch screen interface:

[0083] 1. Physical operation panel:

[0084] Power indicator light: It lights up after QF0 is closed, indicating that the input power (3×208VAC50Hz) is normal.

[0085] Buzzer / Buzzer switch: The buzzer sounds when an alarm occurs. Pressing the buzzer switch can silence the sound (without clearing the alarm record).

[0086] Reset button: Press it after troubleshooting to reset the PLC program and contactor status.

[0087] 2. Touch screen (HMI) operation interface:

[0088]

[0089] PID controller implementation details:

[0090] (I) Hardware interface and wiring: 1. Plug pin definition:

[0091]

[0092] 2. Key components of circuit boards:

[0093] Computation chip: STM32F103RCT6, which implements PID algorithm operation (sampling period 50ms), RS485 communication and alarm logic judgment.

[0094] Solid-state relay (SSR): output current 6A, response time <10ms, controls the on and off of the heating wire, and has a zero-crossing trigger function to reduce electromagnetic interference.

[0095] Fuse: 250V / 6A, protects SSR and heating wire, melting time <5ms (when short-circuit current ≥10A).

[0096] Parameter setting and operation:

[0097] 1. Button function:

[0098] SET key: short press to switch parameter display (PV / SV / ALH, etc.), long press for 3 seconds to enter programming mode.

[0099] ▲ / ▼ keys: short press to adjust the parameter value (SV setting step is 1°C, ALH step is 1°C), long press to increase or decrease quickly.

[0100] AT key: Start automatic calculation (TUN=1), and automatically optimize P / I / D parameters within 2-3 heating cycles (about 30 minutes).

[0101] 2. Core parameter table:

[0102]

[0103] Heating belt structure and installation:

[0104] (1) Physical structure and material: 1. Layered design:

[0105]

[0106] 2. Safety protection device:

[0107] Temperature switch (thermoswitch): Normally closed type, operating temperature 200℃±5℃, when exceeded, the contactor coil power supply is disconnected, response time <2s.

[0108] Thermal fuse (thermofuse): one-time fuse type, fuse temperature 260℃±5℃, after melting, the entire heating belt needs to be replaced.

[0109] Installation and connection:

[0110] 1. Installation steps:

[0111]

[0112] 2. Electrical connection:

[0113] Control cabinet X11 terminal - AMP plug No. 1 / 2 hole - nickel-chromium alloy wire - temperature switch - thermal fuse - contactor KM;

[0114] Control cabinet X12 terminal - AMP plug No. 3 / 4 hole - PID controller A+ / B- - K-type thermocouple - heating belt surface temperature.

[0115] System startup and operation debugging:

[0116] (1) Confirmation before starting:

[0117] Hardware Check:

[0118] Branch circuit breakers QF1-QF8 are in the disconnected state and main circuit breaker QF0 is disconnected.

[0119] The heating belt AMP plug is firmly connected to the control cabinet X11 / X12 terminal without looseness or oxidation.

[0120] The PID controller power indicator light is on and the communication light (COM) flashes (once per second), indicating that the RS485 connection is normal. Parameter preset:

[0121] Use the touch screen to set the machine ID to "TEST01," the number of channels to 4, and the channel IDs to 1-4. Preset SV = 150°C, ALH = 15°C, ALL = 10°C, baud rate 19200 bps, and communication protocol RTU.

[0122] (2) Startup process and monitoring:

[0123]

[0124] (III) Typical operating parameters:

[0125]

[0126] Safety and Maintenance:

[0127] (1) Safety operation specifications:

[0128] High temperature protection:

[0129] It is forbidden to touch the surface of the heating belt during operation, and you must wear heat-insulating gloves (temperature resistance ≥ 300℃) for close operation.

[0130] After shutting down, wait for at least 30 minutes (or use an infrared thermometer to confirm that the surface temperature is less than 40°C) before disassembling or reassembling.

[0131] Electrical Safety:

[0132] Before disassembling or installing the AMP plug, QF0 and the corresponding branch circuit breaker QFx must be disconnected, and a "Do Not Close" warning sign must be hung.

[0133] Communication lines and power lines should be laid separately with a spacing of ≥10cm to avoid communication failures caused by electromagnetic interference.

[0134] (2) Daily maintenance points:

[0135]

[0136] Example: 4-way heating belt system application:

[0137] (1) Working condition description:

[0138] A chemical pipeline project requires heating of four DN50 pipes. The medium temperature is required to be 150℃±2℃, the ambient temperature is -10℃-40℃, and the pipeline length is 3m / pipe.

[0139] (2) System configuration:

[0140] Control cabinet: 4-way independent temperature control, QF1-QF4 branch control, touch screen real-time monitoring.

[0141] PID controller: ID=1-4, SV=150°C, P=200, I=50, D=1000, AT function enabled.

[0142] Heating tape: length 3.2m (covering pipes and flanges), power 120W / channel, insulation layer thickness 5mm.

[0143] (3) Test data:

[0144]

[0145] The present invention achieves high-precision and high-reliability control of pipeline heating through a multi-channel independent temperature control architecture, an intelligent PID adjustment algorithm, a dual safety protection mechanism, and human-computer interaction optimization. The modular design of the control cabinet supports rapid expansion (flexible configuration of 4-8 channels), the touch screen interface reduces the complexity of operation, and the insulation and safety design of the heating belt meet the requirements of harsh industrial environments. The examples show that the system outperforms industry standards in key indicators such as heating rate, temperature uniformity, and fault response. It is suitable for high-end equipment scenarios that require precise temperature control and has significant engineering application value and technological leadership.

[0146] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A pipeline heating belt system, characterized in that: It includes a control cabinet, a PID controller and a heating belt. The control cabinet is connected to the PID controller via an RS485 communication module, and the PID controller is electrically connected to the heating belt. The control cabinet includes: Control system: includes Omron CPU, DI module, DO module and RS485 communication module, collects the switch status of the computer room, the temperature signal of each channel (PV value) and the on-off status of the circuit breaker at a frequency of 100ms / time, and realizes 4-8 independent temperature control through preset logic algorithm; Low-voltage electrical appliances: including Schneider circuit breakers and contactors. The main circuit breaker QF0 serves as the master switch, and the branch circuit breakers QF1-QF8 correspond to the 1-8 heating belts, with 13A±5% overcurrent trip protection and leakage monitoring functions; Operation panel: Includes touch screen, power indicator, buzzer and reset button. The touch screen supports machine number setting, one-click configuration of channel parameters (SV / ALH / ALL) and real-time alarm monitoring, and built-in three-level permission management (operation / maintenance / administrator).

2. A pipeline heating belt system according to claim 1, characterized in that: The DO module of the control cabinet controls the contactors KM1-KM8 through the intermediate relays KA1-KA8 to realize the on-off logic control of the power supply to the heating belts 1-8: The single heating belt circuit is equipped with 10A fast fuse FU1-FU8, which will blow within 10ms when the current exceeds 1.5 times the rated value; A three-level electrical protection mechanism is formed: "shunt circuit breaker (overcurrent protection) - fuse (fast blow) - contactor (on-off control)".

3. A pipeline heating belt system as claimed in claim 1, characterized in that: The touch screen operation interface integrates multi-layer interactive logic: Main screen: Real-time display of each channel's PV value, start / stop status, power ratio, and dynamic channel number setting (4-8 channels), supporting entry and query of PM maintenance records; Parameter display screen: Synchronously displays the set temperature (SV value), high temperature alarm threshold (ALH), low temperature alarm threshold (ALL), and provides 24-hour temperature curve and fluctuation trend analysis; Parameter setting screen: Press the "Write All Confirm" button to synchronize SV, ALH, and ALL parameters to all PID controllers within 30 seconds. Both single-channel independent configuration and multi-channel batch writing are supported, with a parameter step size of 1°C.

4. A pipeline heating belt system as claimed in claim 1, characterized in that: The PID controller collects temperature signals through K-type thermocouples, realizes data exchange based on RS485 communication, and has a built-in automatic calculation algorithm (TUN=1): Dynamically optimize the proportional band (P), integral time (I), and differential time (D) to achieve a temperature control accuracy of ±1°C and a steady-state power ratio of ≤30% (at 180°C). Supports adjustable baud rate of 9600 / 19200 / 38400bps, communication protocol compatible with ModbusRTU, and data sampling period of 50ms; Safety signals (such as emergency stop and door lock signals) are transmitted via dual-channel coding, while non-safety signals (such as voltage values and weighing values) are transmitted via single channel, with an anti-electromagnetic interference design.

5. A pipeline heating belt system as claimed in claim 1, characterized in that: The heating belt includes: Heating body: nickel-chromium alloy heating wire is set inside, the outer layer is covered with silicon-coated fiber cloth, and the middle layer is a high-silicon oxide needle-punched pad insulation layer; Safety protection device: including temperature switch and thermal fuse, which will disconnect the heating power supply in sequence when the temperature exceeds the set threshold.

6. A pipeline heating belt system as claimed in claim 1, characterized in that: AMP quick connectors are set at both ends of the heating belt. Hole 1 (red line) and hole 2 (black line) are connected to the 208VAC power supply, and hole 3 (yellow line) and hole 4 (blue line) are connected to the RS485 communication line (A+ / B-).

7. The pipeline heating belt system according to claim 1, characterized in that: The control cabinet startup process includes: Close the main circuit breaker QF0 and confirm that the power indicator light is on; Set the machine number and channel quantity on the touch screen, and configure the PID controller parameters for each channel; Start each channel contactor in turn, monitor the PV value and SV value through the touch screen to ensure that a stable temperature control state is achieved within 30 minutes.

8. The pipeline heating belt system according to claim 1, characterized in that: Touch screen alarm functions include: High temperature alarm: triggered when PV value > SV value + ALH value; Low temperature alarm: triggered when PV value < SV value + ALL value; Communication failure: triggered when the PID controller loses power or the RS485 signal is interrupted; TC disconnect alarm: Triggered when the thermocouple connection wire is disconnected.

9. The pipeline heating belt system according to claim 1, characterized in that: The heating belt material includes: The inner and outer fabrics are both made of silicone-coated fiber fabrics, and the sewing threads are made of PTFE or glass fiber. The Velcro is made of fire-retardant and high-temperature resistant material and is used to fix the heating belt to the periphery of the pipeline. The fitting tightness error is ≤2mm.

10. The pipeline heating belt system according to any one of claims 1 to 9, characterized in that: The system supports 4-8 independent temperature control channels, with a single input voltage of 100-240VAC, a loop current ≤13A, an operating temperature range of 120℃-180℃, and a temperature uniformity error ≤±2℃.

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