Method for controlling heat sealing temperature of heating wire instantaneous heat sealing mechanism

Abstract

The present invention discloses a method for controlling the heat-sealing temperature of a heating wire instantaneous heat-sealing mechanism, comprising the steps of: a controller setting the heat-sealing temperature T; a temperature sensor detecting the temperature T1 of the heating wire in real time; a controller calculating the resistance value R of the heating wire in real time; a controller converting the temperature value T2; a controller comparing T2 and T in real time, when T2=T, the controller comparing T2 and T1 again, calculating the compensation temperature value T2-T1; adjusting the current in the heating wire; a controller comparing T1 and T in real time, when T1=T, maintaining the current in the heating wire unchanged, and when T1 is greater than T, reducing the current in the heating wire. The present invention compares and controls the two temperature parameters obtained by the temperature sensor and the change of the resistance value of the heating wire, and performs temperature compensation, accurately controls the temperature of the heating wire, thereby obtaining a reliable heat-sealing temperature, ensuring the stability of the heat-sealing temperature, and controlling the accuracy of the heat-sealing temperature within ±0.5°C.

Description

[0001] This divisional application is a divisional application with an application date of November 26, 2020, application number 202011353805.6, and invention name “Heating wire instantaneous heat sealing mechanism and method for controlling its heat sealing temperature”. Technical Field

[0002] The invention relates to a method for controlling the heat-sealing temperature of a heating wire instantaneous heat-sealing mechanism. Background Art

[0003] In the prior art, heat sealing of air cushion films is usually carried out by heating copper blocks or heating rods. During the heat sealing process using heating copper blocks or heating rods, the temperature of the sealing line is easily too high and uncontrollable during the startup phase. During the stable operation phase, as the machine runs for a long time, the overall temperature will increase, and the heat sealing area on the air cushion film will become overheated, thereby affecting the heat sealing effect of the air cushion film. Summary of the invention

[0004] The purpose of the invention is to provide a method for controlling the heat-sealing temperature of a heating wire instantaneous heat-sealing mechanism.

[0005] According to one aspect of the present invention, a method for controlling the heat sealing temperature of a heating wire instantaneous heat sealing mechanism is provided, comprising the following steps:

[0006] (a) The controller sets the heat sealing temperature T;

[0007] (b) The temperature sensor detects the temperature T1 of the heating wire in real time;

[0008] (c) The controller calculates the resistance value R of the heating wire in real time based on the voltage value at both ends of the heating wire and the current value passing through;

[0009] (d) The controller converts the temperature value T2 according to the temperature-resistance characteristic of the heating wire material itself;

[0010] (e) The controller compares T2 and T in real time. When T2=T, the controller compares T2 and T1 again and calculates the compensation temperature value T2-T1;

[0011] (f) adjusting the current in the heating wire;

[0012] (g) The controller compares T1 and T in real time. When T1=T, the current in the heating wire is maintained unchanged. When T1 is greater than T, the current in the heating wire is reduced.

[0013] The control method of the present invention adopts two temperature detection methods, direct measurement and indirect measurement, to ensure real-time and accurate heat sealing temperature. In the direct measurement, a temperature sensor is used to obtain the temperature close to the heating wire, and the temperature T1 of the heating wire detected by the temperature sensor is used as a calibration reference. In the indirect measurement, a controller is used to calculate the resistance value R of the heating wire according to the voltage value and current value of the heating wire in real time. The controller converts the theoretical temperature value T2 of the heating wire in real time through the temperature-resistance characteristic of the heating wire itself. When T2=T, due to the influence of the external environment, the actual temperature T1 of the heating wire will be lower than the set value T. At this time, temperature compensation is required, and the temperature compensation value is T2-T1. The controller increases the heating by increasing the current output. The current in the hot wire increases the heat generated by the heating wire until the temperature T1 of the heating wire detected by the temperature sensor is the same as the heat sealing temperature T. When T1=T, the current in the heating wire is maintained unchanged. When T1 is greater than T, the current in the heating wire is reduced, and T1 fluctuates continuously near T. The controller continuously adjusts, and finally maintains T1 and T within a very small deviation range. The control method of the present invention compares and controls the two temperature parameters obtained by the temperature sensor and the change in the resistance value of the heating wire, and performs temperature compensation to accurately control the temperature of the heating wire, thereby obtaining a reliable heat sealing temperature, ensuring the stability of the heat sealing temperature, and controlling the accuracy of the heat sealing temperature within ±0.5°C.

[0014] In some embodiments, in step (b), the temperature sensor may be an NTC thermistor, a PTC thermistor or a thermocouple. Thus, the NTC thermistor and the PTC thermistor have high sensitivity, a wide operating temperature range, a small size, good stability, and a strong overload capacity, and the thermocouple has high measurement accuracy, a large measurement range, a fast thermal response time, good pressure resistance, high temperature resistance, and a long service life.

[0015] In some embodiments, in step (f), the controller can intelligently adjust the current in the heating wire through an adaptive fuzzy PID algorithm. Thus, the adaptive fuzzy PID algorithm can intelligently adjust the current output, accurately control the temperature of the heating wire, and ensure the stability of the heat sealing temperature.

[0016] In some embodiments, in step (a), the heat sealing temperature T may be 100 to 130° C. Thus, a heat sealing temperature of 100 to 130° C. can ensure a good heat sealing effect on the air cushion film.

[0017] In some embodiments, in step (b), the heating wire can be arranged on the surface of the base, the temperature sensor is arranged on the base, the temperature sensor is electrically connected to the controller, the temperature sensor detects the temperature of the heating wire and transmits the temperature signal to the controller, the controller is electrically connected to the heating wire, and the controller controls the current in the heating wire. Thus, the heat generated by the heating wire is used to heat-seal the air cushion film, the temperature sensor can monitor the temperature of the heating wire in real time and accurately, and by adjusting the current in the heating wire, the temperature of the heating wire can reach the temperature required for heat-sealing the air cushion film. The real-time monitoring of the temperature sensor can ensure the stability of the heat-sealing temperature, and when the heating wire heat-seals the air cushion film, a relatively good heat-sealing effect can be achieved. With the monitored temperature, real-time adjustments are made to ensure the stability of the heat seal, and the temperature accuracy of the heating wire can be controlled within ±0.5°C. Moreover, compared with the heat-sealing method of copper blocks and heating rods, the instantaneous heat sealing of the heating wire saves costs in structure and simplifies the assembly of the heat-sealing mechanism.

[0018] In some embodiments, the surface of the base may be provided with adhesive tape A, the heating wire is provided on the surface of adhesive tape A, and the heating wire is covered with adhesive tape B. Thus, adhesive tape B can prevent the heating wire from directly contacting the heat sealing tape, cut off part of the heat, and prevent the heat sealing tape or the air cushion film from being scalded. Adhesive tape B can play a role in heat insulation and wear prevention. Adhesive tape A can prevent the heating wire from directly contacting the temperature sensor, and prevent the temperature sensor from being scalded. Adhesive tape A can play a role in heat insulation.

[0019] In some embodiments, the surface of the base may be provided with a concave receiving cavity, the temperature sensor is received in the receiving cavity, the adhesive tape A covers the receiving cavity, and the temperature sensor is attached to the adhesive tape A. Thus, the temperature sensor is located in the base and installed directly below the heating wire, so that the temperature of the heating wire can be monitored more accurately to ensure the stability of the heat sealing temperature.

[0020] In some embodiments, a fixing seat A and a fixing seat B may be provided on the side of the base, one end of the heating wire is provided on the fixing seat A, and the other end of the heating wire is provided on the fixing seat B, and the heating wire is distributed around the periphery of the base. Thus, the fixing seat A and the fixing seat B can be used as mounting seats for the heating wire, facilitating the loading and unloading of the heating wire, and the current is transmitted through the fixing seat A and the fixing seat B so that the heating wire generates the heat required for heat sealing.

[0021] In some embodiments, adhesive tape A and adhesive tape B may be high temperature resistant adhesive tape, which can play a good role in heat insulation and wear prevention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of a method for controlling the heat sealing temperature of a heating wire instantaneous heat sealing mechanism according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A schematic structural diagram of a heating wire instantaneous heat sealing mechanism to which the control method shown is applicable;

[0024] Figure 3 for Figure 2 A side view of the heating wire instant heat sealing mechanism shown;

[0025] Figure 4 for Figure 3 A cross-sectional view of the heating wire instantaneous heat sealing mechanism along the AA direction shown;

[0026] Figure 5 for Figure 4 The enlarged structural schematic diagram of point B in the heating wire instantaneous heat sealing mechanism is shown. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0028] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] Figure 1 The flowchart of a method for controlling the heat sealing temperature of a heating wire instantaneous heat sealing mechanism according to an embodiment of the present invention is schematically shown.

[0030] refer to Figure 1 The method for controlling the heat sealing temperature of the heating wire instantaneous heat sealing mechanism comprises the following steps:

[0031] 101: The controller sets the heat sealing temperature T.

[0032] The heat sealing temperature T is preferably set to 120°C, which can ensure a good heat sealing effect on the air cushion film;

[0033] The controller may be a microcontroller, a single chip microcomputer controller or a computer.

[0034] 102: The temperature sensor detects the temperature T1 of the heating wire in real time.

[0035] The temperature sensor is installed close to the heating wire 2, such as directly below the heating wire;

[0036] The temperature sensor can use NTC thermistor, which can accurately monitor the temperature of the heating wire. NTC thermistor has high sensitivity, wide operating temperature range, small size, good stability and strong overload capacity. The temperature sensor can also use PTC thermistor, which has high sensitivity, wide operating temperature range, small size, good stability and strong overload capacity. The temperature sensor can also use thermocouple, which has high measurement accuracy, large measurement range, fast thermal response time, good pressure resistance, high temperature resistance and long service life.

[0037] The temperature T1 of the heating wire detected by the temperature sensor is used as the calibration reference.

[0038] 103: The controller calculates the resistance value R of the heating wire in real time according to the voltage value at both ends of the heating wire and the current value passing through.

[0039] 104: The controller converts the temperature value T2 according to the temperature-resistance characteristic of the heating wire material itself.

[0040] The heating wire is made of nickel-chromium alloy. The temperature-resistance characteristics of nickel-chromium alloy are shown in the following table:

[0041] Temperature(℃) -73.3 -30.0 -17.8 -10.0 0.0 10.0 20.0 Resistance (Ω) 0.876489 0.933833 0.950007 0.960300 0.973533 0.986767 1.000000 Temperature(℃) 21.1 30.0 40.0 50.0 60.0 70.0 80.0 Resistance (Ω) 1.001262 1.011362 1.022725 1.034088 1.045450 1.056812 1.068175 Temperature(℃) 90.0 93.3 100.0 120.0 204.4 315.6 426.7 Resistance (Ω) 1.079538 1.083325 1.090900 1.112512 1.195887 1.296852 1.385797

[0042] The controller calculates the resistance value R of the heating wire according to the voltage and current values ​​of the heating wire in real time, and then compares and inquires according to the above table (temperature-resistance characteristics) to obtain the theoretical temperature value T2 of the heating wire in real time. For example, when R=1.083325Ω, T2=93.3℃ is obtained.

[0043] 105: The controller compares T2 and T in real time. When T2=T, the controller compares T2 and T1 again to calculate the compensation temperature value T2-T1.

[0044] Due to the influence of the external environment, the actual temperature T1 of the heating wire will be lower than the set value T. At this time, temperature compensation is required to ensure that the temperature of the heating wire reaches the set value T. Otherwise, the actual temperature value of the heating wire will always remain at a low value and cannot reach the set value T, affecting the heat sealing effect.

[0045] For example, when the controller obtains T2=120℃ through comparison query, that is, the theoretical temperature value of the heating wire is the same as the set temperature, the actual temperature of the heating wire may be only 110℃, that is, T1=110℃. The actual temperature of the heating wire 110℃ is lower than the set value 120℃. At this time, temperature compensation is required, and the compensated temperature value is T2-T1=120℃-110℃=10℃.

[0046] 106: Adjust the current in the heating wire.

[0047] The way of temperature compensation is to increase the current in the heating wire by increasing the current output, thereby increasing the heat generated by the heating wire;

[0048] The controller can intelligently adjust the current output through the adaptive fuzzy PID algorithm, intelligently adjust the current in the heating wire, and increase the heat generated by the heating wire. The adaptive fuzzy PID algorithm uses fuzzy logic and optimizes the PID parameters in real time according to certain fuzzy rules and the currently detected temperature data, and then performs PWM voltage regulation on the heating wire according to the PID algorithm, thereby controlling the current in the heating wire, achieving precise control of the temperature of the heating wire, and ensuring the stability of the heat sealing temperature.

[0049] 107: The controller compares T1 and T in real time. When T1=T, the current in the heating wire is maintained unchanged. When T1 is greater than T, the current in the heating wire is reduced.

[0050] Repeat step 107.

[0051] By increasing the current output, the heat generated by the heating wire increases, and the controller compares T1 and T in real time. When the temperature T1 of the heating wire detected by the temperature sensor is the same as the heat sealing temperature T, that is, when T1=T=120℃, the controller maintains the current in the heating wire unchanged by control. If the current in the heating wire is always kept at a large value, the temperature T1 of the heating wire will be higher than the set value T. At this time, it is necessary to reduce the current in the heating wire, that is, the controller compares T1 and T in real time. When T1 is greater than T, the controller reduces the current output in the heating wire through the adaptive fuzzy PID algorithm to reduce the heat generated by the heating wire. In this case, T1 will continue to fluctuate near T, and the controller will continue to adjust, and finally keep T1 and T within a very small deviation range. This process is reciprocating and constantly adjusted. The temperature curve of the actual temperature T1 of the heating wire is constantly fluctuating, and the controller uses the adaptive fuzzy PID algorithm to continuously reduce the amplitude and period of this fluctuation, so that the temperature error is also very small, so that the temperature T1 of the heating wire fluctuates within the set value T±0.5℃, thereby obtaining a reliable heat sealing temperature and ensuring the stability of the heat sealing temperature.

[0052] The control method of the present invention adopts two temperature detection methods, direct measurement and indirect measurement, to ensure real-time and accurate heat sealing temperature. In the direct measurement, a temperature sensor is used to obtain the temperature close to the heating wire, and the temperature T1 of the heating wire detected by the temperature sensor is used as a calibration reference. In the indirect measurement, a controller is used to calculate the resistance value R of the heating wire according to the voltage value and current value of the heating wire in real time. The controller converts the theoretical temperature value T2 of the heating wire in real time through the temperature-resistance characteristic of the heating wire itself. When T2=T, temperature compensation is performed, and the temperature compensation value is T2-T1. The controller increases the current in the heating wire by increasing the current output, thereby increasing the heat generated by the heating wire until the temperature sensor The detected temperature T1 of the heating wire is the same as the heat sealing temperature T. When T1=T, the current in the heating wire is maintained unchanged. When T1 is greater than T, the current in the heating wire is reduced. The controller reduces the current in the heating wire by reducing the current output. T1 fluctuates continuously near T, and the controller continuously adjusts, and finally maintains T1 and T within a very small deviation range. The control method of the present invention compares and controls the two temperature parameters obtained by the temperature sensor and the change in the resistance value of the heating wire, and performs temperature compensation to accurately control the temperature of the heating wire, thereby obtaining a reliable heat sealing temperature, ensuring the stability of the heat sealing temperature, and controlling the accuracy of the heat sealing temperature within ±0.5°C.

[0053] Figures 2 to 5 Schematically shows Figure 1 The control method shown is applicable to the structure of a heating wire instantaneous heat sealing mechanism.

[0054] refer to Figures 2 to 5 , Figure 1 The control method shown is applicable to a heating wire instant heat sealing mechanism, which includes a base 1, a heating wire 2, a temperature sensor 3 and a controller. In addition, the heating wire instant heat sealing mechanism may also include adhesive tape A4 and adhesive tape B5.

[0055] refer to Figure 2 The left end of the base 1 is semicircular, the top of the base 1 is flat, the bottom of the base 1 is concave, the right end of the base 1 is used to install the fixing seat A11 and the fixing seat B12, and the left end of the semicircular base 1 is convenient for installing the closed and conveyed heat-sealing belt; in the equipment for making the buffer air cushion film, the base 1 is usually installed on the inner side of the heat-sealing belt, and the top, left end and bottom of the base 1 are attached to the heat-sealing belt.

[0056] refer to Figure 2 and Figure 5, adhesive tape A4 is attached to the surface of the base 1, and the top, semicircular turning part, and bottom of the base 1 are continuously attached with adhesive tape A4, the heating wire 2 is laid on the adhesive tape A4, and the top, semicircular turning part, and bottom of the base 1 are continuously laid with the heating wire 2, the adhesive tape B5 covers the heating wire 2 and is attached to the surface of the adhesive tape A4, and the top, semicircular turning part, and bottom of the base 1 are continuously attached with adhesive tape B5, the heating wire 2 is located between the adhesive tape A4 and the adhesive tape B5, and the adhesive tape B5 can prevent the heating wire 2 from directly sticking to the heat-sealing tape for making the cushioning air cushion film, cut off part of the heat, and prevent In order to avoid scalding the heat-sealing tape or the air cushion film, the tape B5 can play a role in heat insulation and wear prevention; since the bottom of the base 1 is concave, the tape A4, the heating wire 2, and the tape B5 at the bottom of the base 1 will not protrude from the plane where the two convex edges of the bottom of the base 1 are located, thus preventing the heating wire 2 from heating and scalding other components in the equipment for making the buffer air cushion film; the tape A4, the heating wire 2, and the tape B5 at the top of the base 1 all protrude from the plane at the top of the base 1, thus ensuring that the tape B5 on the top layer can fit on the heat-sealing tape to heat-seal the air cushion film.

[0057] refer to Figure 4 and Figure 5 A concave accommodating cavity 13 is formed on the top of the base 1, and the temperature sensor 3 is accommodated in the accommodating cavity 13. The adhesive tape A4 covers the top of the accommodating cavity 13, and the temperature sensor 3 is attached to the lower surface of the adhesive tape A4; the adhesive tape A4 can prevent the heating wire 2 and the temperature sensor 3 from directly contacting each other to prevent the temperature sensor 3 from being scalded. The adhesive tape A4 can play a role in heat insulation. Moreover, the temperature sensor 3 is located directly below the heating wire 2, so that the temperature of the heating wire 2 can be monitored more accurately to ensure the stability of the heat sealing temperature.

[0058] refer to Figure 2 and Figure 4 A fixing seat A11 and a fixing seat B12 are installed at the right end of the base 1, one end of the heating wire 2 is installed on the fixing seat A11, and the other end of the heating wire 2 is installed on the fixing seat B12. The material of the fixing seat A11 and the fixing seat B12 can be a copper block; the fixing seat A11 and the fixing seat B12 can be used as a mounting seat for the heating wire 2, which is convenient for the loading and unloading of the heating wire 2, and the current can be transmitted through the fixing seat A11 and the fixing seat B12 to make the heating wire 2 generate the heat required for heat sealing.

[0059] In this embodiment, both adhesive tape A4 and adhesive tape B5 are made of high temperature resistant adhesive tape, which can play a good role in heat insulation and wear prevention; adhesive tape A4 and adhesive tape B5 are preferably Teflon adhesive tape, which is resistant to high temperatures and can play a good role in heat insulation and wear prevention, and the surface of Teflon adhesive tape is smooth and anti-sticking. In other embodiments, adhesive tape A4 and adhesive tape B5 can also be made of other high temperature resistant adhesive tapes that can play a role in heat insulation and wear prevention.

[0060] In this embodiment, the temperature sensor 3 adopts an NTC thermistor, through which the temperature of the heating wire 2 can be accurately monitored. The NTC thermistor has high sensitivity, a wide operating temperature range, a small size, good stability, and a strong overload capacity. In other embodiments, the temperature sensor 3 may also adopt a PTC thermistor, which has high sensitivity, a wide operating temperature range, a small size, good stability, and a strong overload capacity. The thermocouple has high measurement accuracy, a large measurement range, a fast thermal response time, good pressure resistance, high temperature resistance, and a long service life. In other embodiments, the temperature sensor 3 may also adopt a thermocouple, which has high measurement accuracy, a large measurement range, a fast thermal response time, good pressure resistance, high temperature resistance, and a long service life.

[0061] The temperature sensor 3 is connected to the controller through a wire. The temperature sensor 3 detects the temperature of the heating wire 2 and transmits the temperature signal to the controller for processing. The controller is connected to the heating wire 2. The controller can intelligently adjust the current in the heating wire 2 through an adaptive fuzzy PID algorithm. The controller can also be connected to the heating wire 2 through a current regulator and a wire to adjust the current in the heating wire 2. The current regulator can also be integrated in the controller.

[0062] The controller may be a microcontroller, a single chip microcomputer controller or a computer.

[0063] The controller can be directly installed on the equipment for manufacturing the buffer air cushion film, and can also be installed in the base 1 as required.

[0064] Figure 1 The control method shown is applicable to a heating wire instantaneous heat sealing mechanism, in which the heat generated by the heating wire 2 is used to heat seal the air cushion film. The temperature sensor 3 located directly below the heating wire 2 can monitor the temperature of the heating wire 2 in real time and accurately. By adjusting the current in the heating wire 2, the temperature of the heating wire 2 can reach the temperature required for heat sealing the air cushion film. The real-time monitoring of the temperature sensor 3 can ensure the stability of the heat sealing temperature. When the heating wire 2 heat seals the air cushion film, a relatively good heat sealing effect can be achieved. Real-time adjustments are made with the monitored temperature to ensure the stability of the heat seal, and the temperature accuracy of the heating wire can be controlled within ±0.5°C. Moreover, compared with the heat sealing method of copper blocks and heating rods, the instantaneous heat sealing of the heating wire 2 saves structural costs and simplifies the assembly of the heat sealing mechanism. In addition, the tapes A4 and B5 can play a good role in heat insulation and wear prevention.

[0065] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the creative concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for controlling the heat sealing temperature of a heating wire instantaneous heat sealing mechanism, characterized in that: The following steps are involved: (a) The controller sets the heat sealing temperature T; (b) The temperature sensor detects the temperature T1 of the heating wire in real time; (c) The controller calculates the resistance value R of the heating wire in real time based on the voltage value at both ends of the heating wire and the current value passing through; (d) The controller converts the temperature value T2 according to the temperature-resistance characteristic of the heating wire material itself; (e) The controller compares T2 and T in real time. When T2=T, the controller compares T2 and T1 again and calculates the compensation temperature value T2-T1; (f) adjusting the current in the heating wire; (g) The controller compares T1 and T in real time. When T1=T, the current in the heating wire is maintained unchanged. When T1 is greater than T, the current in the heating wire is reduced.

2. The control method according to claim 1, characterized in that: In the step (b), the temperature sensor is an NTC thermistor, a PTC thermistor or a thermocouple.

3. The control method according to claim 1, characterized in that: In the step (f), the controller intelligently adjusts the current in the heating wire through an adaptive fuzzy PID algorithm.

4. The control method according to claim 1, characterized in that: In the step (a), the heat sealing temperature T is 100-130°C.

5. The control method according to claim 1, characterized in that: In the step (b), the heating wire is arranged on the surface of the base, the temperature sensor is arranged on the base, the temperature sensor is electrically connected to the controller, the temperature sensor detects the temperature of the heating wire and transmits the temperature signal to the controller, the controller is electrically connected to the heating wire, and the controller controls the current in the heating wire.

6. The control method according to claim 5, characterized in that: The surface of the base is provided with adhesive tape A, the heating wire is arranged on the surface of the adhesive tape A, and the heating wire is covered with adhesive tape B.

7. The control method according to claim 6, characterized in that: The surface of the base is provided with a concave accommodating cavity, the temperature sensor is accommodated in the accommodating cavity, the adhesive tape A covers the accommodating cavity, and the temperature sensor is attached to the adhesive tape A.

8. The control method according to claim 5, characterized in that: A fixing seat A and a fixing seat B are provided on the side of the base, one end of the heating wire is provided on the fixing seat A, and the other end of the heating wire is provided on the fixing seat B. The heating wires are distributed around the periphery of the base.

9. The control method according to claim 6 or 7, characterized in that: The adhesive tape A and the adhesive tape B are high temperature resistant adhesive tapes.

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