An automatic temperature correction system for a hot air gun

Abstract

The application discloses a kind of hot air gun automatic temperature correction systems, it includes infrared emitter, red line external receiver, control host, temperature correction device;Hot air gun is equipped with temperature sensor inside, it sends the first temperature value measured to control host;Temperature correction device is equipped with bimetallic strip made of different materials, hot air gun is placed in temperature correction device, bimetallic strip has a certain distance with the air outlet of hot air gun;When automatically correcting temperature, hot air gun is placed on temperature correction device, the first temperature value at the air outlet of hot air gun is controlled by temperature sensor of control host;Control infrared emitter emits waveform signal to bimetallic strip, and infrared receiver receives the reflected waveform signal reflected by different metal sheet;According to two kinds of different reflected waveform signal, the second temperature value and wind speed of bimetallic strip are obtained;According to second temperature value, wind speed and first temperature value, automatically correct temperature, so that second temperature value reaches preset temperature value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hot air gun, in particular to a kind of hot air gun automatic temperature calibration system. BACKGROUND

[0002] Hot air gun is a kind of tool that uses the hot air blown by the gun core of heating resistance wire to weld and pick up components, which is mainly composed of air pump, linear circuit board, handle, shell and other basic components. Hot air gun mainly includes high-speed hot air gun, constant temperature hot air gun, digital hot air gun, etc., which is one of the important tools for maintaining communication equipment, and has high process requirements. It can be widely used in petroleum, chemical industry, machinery, mining, metallurgy, hardware, electronics, food and other fields.

[0003] In order to ensure that the hot air blown by hot air gun reaches the required temperature, artificial measurement of the hot air at the outlet of high-power hot air gun is usually adopted at present, and then artificial auxiliary temperature calibration is carried out according to the temperature difference between the measured temperature and the temperature display value of high-power hot air gun. It is very inconvenient to use. SUMMARY

[0004] The present application provides a kind of hot air gun automatic temperature calibration system to overcome the problems of the deficiencies and defects of the prior art.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] A kind of hot air gun automatic temperature calibration system, including the hot air gun for blowing hot air, infrared emitter and infrared receiver respectively arranged at both sides of hot air gun, control host for controlling hot air gun to blow hot air according to preset temperature, temperature calibration device for fixing and calibrating hot air gun;

[0007] The hot air gun is provided with a temperature sensor for measuring the temperature of the outlet of the hot air gun;The temperature sensor sends the first temperature value measured to the control host;

[0008] The temperature calibration device is provided with a bimetallic strip made of different materials, and the bimetallic strip has a certain distance from the outlet of the hot air gun when the hot air gun is placed on the temperature calibration device;

[0009] The infrared emitter and the infrared receiver are electrically connected with the control host;

[0010] When automatic temperature calibration is carried out, the hot air gun is placed on the temperature calibration device, and the control host controls the first temperature value at the outlet of the hot air gun through the temperature sensor;

[0011] The control host controls the infrared emitter to emit a waveform signal to the bimetallic strip, the infrared receiver receives two different reflected waveform signals reflected by different metal sheets on the bimetallic strip; the control host obtains the second temperature value of the bimetallic strip and the wind speed at the bimetallic strip according to the two different reflected waveform signals;

[0012] The control host automatically calibrates the temperature according to the second temperature value, the wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value.

[0013] Preferably, the control host obtains the second temperature value of the bimetallic strip and the wind speed at the bimetallic strip according to the two different reflected waveform signals, comprising:

[0014] According to the relationship between the amplitude of the reflected waveform signal and the temperature, the second temperature value of the bimetallic strip is calculated by one of the reflected waveform signals;

[0015] According to the wind speed model, the wind speed at the bimetallic strip is calculated by using the two different reflected waveform signals.

[0016] Preferably, the control host automatically calibrates the temperature according to the second temperature value, the wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value, comprising:

[0017] The control host first controls the working power of the hot air gun according to the preset temperature value, so that the first temperature value at the air outlet of the hot air gun reaches the preset temperature value;

[0018] The temperature difference value between the second temperature value measured by placing the hot air gun on the temperature calibration device and the preset temperature value is calculated;

[0019] According to the temperature difference value, the control host controls the working power of the hot air gun, so that the second temperature value reaches the preset temperature value;

[0020] The third temperature value at the air outlet of the hot air gun and the wind speed at this time are recorded;

[0021] Before the next temperature calibration, the control host controls the temperature at the air outlet of the hot air gun to remain at the third temperature value at the wind speed, and determines that the temperature at the bimetallic strip reaches the preset temperature value.

[0022] Preferably, the control host automatically calibrates the temperature according to the second temperature value, the wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value, comprising: the control host inputs the input preset temperature, wind speed and distance into the pre-built temperature calibration compensation model to obtain the estimated output temperature at the air outlet of the hot air gun;

[0023] The control host controls the hot air gun to work so that the temperature value at the air outlet reaches the temperature;

[0024] The temperature difference value between the second temperature value measured by placing the hot air gun on the temperature calibration device and the preset temperature value is calculated; at this time, the temperature difference value is smaller than the temperature difference value between the second temperature value measured after directly adjusting the temperature at the air outlet of the hot air gun to the preset temperature value and the preset temperature value;

[0025] According to the temperature difference value, the host computer controls the working power of the hot air gun, so that the second temperature value reaches the preset temperature value;

[0026] The third temperature value and the air speed at the air outlet of the hot air gun at this time are recorded;

[0027] Before the next temperature calibration, the control host controls the temperature at the air outlet of the hot air gun to be maintained at the third temperature value at the air speed, and determines that the temperature at the bimetallic strip reaches the preset temperature value.

[0028] Preferably, the hot air gun comprises a handle shell with a containing cavity, and a heating core arranged in the handle shell;

[0029] One end of the handle shell is provided with an air outlet;

[0030] The other end of the handle shell is provided with an air inlet for connecting the second air outlet of the air blower;

[0031] The infrared emitter and the infrared receiver are arranged on the two sides of the handle shell, respectively, and the infrared emitter and the infrared receiver are arranged towards the air outlet of the handle shell;

[0032] The temperature sensor is fixed on the heating core and located at the air outlet of the handle shell.

[0033] Preferably, the temperature calibration device comprises a fixed base and a support frame;

[0034] The bimetallic strip is arranged in the middle of the fixed base through a ceramic heat insulation support;

[0035] The support frame is arranged on the fixed base, and the support frame is provided with a fixing frame for supporting the hot air gun, and the fixing frame is located above the bimetallic strip and is arranged at a distance;

[0036] When the hot air gun is placed on the fixing frame, the air outlet of the hot air gun is at a distance from the bimetallic strip.

[0037] Compared with the prior art, the present application has the following advantages:

[0038] This invention utilizes a bimetallic strip to reflect emitted waveform signals, obtaining two different reflected waveforms to measure a second temperature value and wind speed at the bimetallic strip location. The control unit automatically calibrates the temperature based on the second temperature value and wind speed, ensuring the second temperature reaches a preset temperature. This invention allows for automatic temperature calibration of a location a certain distance from the hot air gun's outlet simply by setting the desired operating temperature and placing the hot air gun on the calibration device, making it extremely convenient to use. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of an automatic temperature calibration system for a hot air gun according to the present invention.

[0040] Figure 2 This is a schematic diagram of the hot air gun provided by the present invention placed on the temperature calibration device.

[0041] Figure 3 This is a cross-sectional schematic diagram of the hot air gun provided by the present invention.

[0042] Figure 4 This is a schematic diagram of the overall structure of the hot air gun provided by the present invention.

[0043] Figure 5 This is a schematic diagram of the structure of the blower provided by the present invention.

[0044] In the diagram, 1-control host, 2-handle shell, 3-heating core, 4-infrared receiver, 5-temperature sensor, 6-infrared transmitter, 7-air outlet, 8-bimetallic strip, 9-fixed base, 10-support frame, 11-ceramic heat insulation bracket, 12-blower, 13-second air outlet, 14-hot air gun, 15-temperature calibration device, 16-air inlet, 17-temperature calibration button. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0046] It should be understood that, when used in this specification, the terms “comprising” and “including” indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0047] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms.

[0048] It should also be further understood that the term "and / or" as used in this specification refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes such combinations.

[0049] like Figure 1 As shown, an automatic temperature calibration system for a hot air gun 14 includes a hot air gun 14 for blowing out hot air, an infrared transmitter 6 and an infrared receiver 4 respectively disposed on both sides of the hot air gun 14, a control host 1 for controlling the hot air gun 14 to blow out hot air at a preset temperature, and a temperature calibration device 15 for fixing and calibrating the temperature of the hot air gun 14.

[0050] The hot air gun 14 is equipped with a temperature sensor 5 inside for measuring the temperature of the air outlet 7 of the hot air gun 14; the temperature sensor 5 sends the measured first temperature value to the control host 1.

[0051] The temperature calibration device 15 is provided with a bimetallic strip 8 made of different materials. When the hot air gun 14 is placed on the temperature calibration device 15, the bimetallic strip 8 and the air outlet 7 of the hot air gun 14 are at a certain distance.

[0052] The infrared transmitter 6 and the infrared receiver 4 are both electrically connected to the control host 1.

[0053] During automatic temperature calibration, the hot air gun 14 is placed on the temperature calibration device 15, and the control host 1 controls the first temperature value at the air outlet 7 of the hot air gun 14 through the temperature sensor 5.

[0054] The control host 1 controls the infrared transmitter 6 to transmit waveform signals to the bimetallic strip 8, and the infrared receiver 4 receives two different reflected waveform signals reflected back from different metal pieces on the bimetallic strip 8; the control host 1 obtains the second temperature value of the bimetallic strip 8 and the wind speed at the bimetallic strip 8 based on the two different reflected waveform signals.

[0055] The control host 1 automatically adjusts the temperature based on the second temperature value, wind speed, and first temperature value, so that the second temperature value reaches the preset temperature value.

[0056] This invention utilizes a bimetallic strip 8 to reflect emitted waveform signals, obtaining two different reflected waveforms to measure a second temperature value and wind speed at the bimetallic strip 8. The control host 1 automatically calibrates the temperature based on the second temperature value and wind speed, ensuring the second temperature reaches a preset temperature. This invention allows for automatic temperature calibration of a location a certain distance from the outlet 7 of the hot air gun 14 simply by setting the desired operating temperature and placing the hot air gun 14 on the calibration device 15, making it very convenient to use.

[0057] In this embodiment, the waveform signal includes a square wave, a sine wave, or a triangular wave. Preferably, a square wave signal of a certain frequency is used.

[0058] In one specific embodiment, the control host 1 acquires the second temperature value of the bimetallic strip 8 and the wind speed at the bimetallic strip 8 based on two different reflected waveform signals, including:

[0059] Based on the relationship between the amplitude of the reflected waveform signal and temperature, the second temperature value of the bimetallic strip 8 is calculated using one of the reflected waveform signals.

[0060] Based on the wind speed model, the wind speed at point 8 of the bimetallic strip was calculated using two different reflected waveform signals.

[0061] In this embodiment, the present invention actually utilizes the time-domain response characteristics of the infrared thermal radiation of the metal sheet and the convection cooling effect to calculate temperature and wind speed. That is, the present invention uses the influence of the temperature of the metal sheet on the amplitude of the reflected waveform signal to calculate the temperature; and calculates the wind speed based on the fact that wind speed affects the heat dissipation rate of the metal sheet surface, thereby changing the time-domain waveform characteristics (such as rise / fall time) of the reflected waveform signal.

[0062] This invention calculates the temperature value of the metal sheet, specifically as follows:

[0063] Assuming the transmitted waveform signal is a square wave (e.g., 1kHz), measure the amplitude A of the reflected waveform signal. ref ;in,

[0064]

[0065] in, This represents the calibration constant, which is related to the distance from the infrared transmitter 6, the infrared receiver 4 to the bimetallic strip 8; Emissivity is a measure of the refractive index and is related to metallic materials, such as copper. ≈0.05, aluminum ≈0.1.

[0066] Based on the above formula, the second temperature value of the bimetallic strip can be calculated by using the waveform signal reflected by one of the metal strips in the bimetallic strip 8.

[0067] This embodiment can also utilize the different emissivity of the two metal sheets in the bimetallic solution to eliminate environmental interference through the difference in reflection amplitude, and accurately calculate the second temperature value. That is, it simultaneously uses the waveform signals reflected by the two metal sheets to calculate two temperature values, and then averages them as the second temperature value to improve measurement accuracy.

[0068] In this embodiment, the fall time of the waveform signal reflection is changed according to the influence of wind speed on the convective heat dissipation of the metal surface. Specifically, wind speed increases convection heat dissipation, and the falling edge becomes steeper. (Decrease).

[0069] This invention obtains the waveform signal reflected by the bimetallic strip 8 and extracts the amplitude of the bimetallic strip 8. , descent time .

[0070] The temperature is calculated as follows:

[0071]

[0072] in, This represents the calibration constant, which is related to the distance from the infrared transmitter 6, the infrared receiver 4, to the bimetallic strip 8. The temperature calculated at this point can be used as the second temperature value.

[0073] Calculate the wind speed as follows:

[0074]

[0075] in, , This represents the experimental calibration coefficient.

[0076] In one specific embodiment, in actual operation, the air outlet 7 of the hot air gun 14 is also a certain distance from the object to be welded. Therefore, this invention sets up a temperature calibration device 15 based on the distance between the air outlet 7 of the hot air gun 14 and the object to be welded in daily operation. When the hot air gun 14 is placed on the temperature calibration device 15, the distance between the air outlet 7 of the hot air gun 14 and the bimetallic strip 8 set on the temperature calibration device 15 is equal to the actual distance between the air outlet 7 of the hot air gun 14 and the object to be welded. Since there is a certain distance between the air outlet 7 of the hot air gun 14 and the object to be welded, and there is a wind speed, in reality, if the temperature of the air outlet 7 is only controlled to reach the preset temperature, the temperature of the welding point a certain distance away from the air outlet 7 of the hot air gun 14 will be much lower than the preset temperature. This temperature will affect the welding work, such as welding efficiency. Therefore, it is necessary to adjust the working power of the hot air gun 14 from time to time during operation so that the temperature of the welding point a certain distance away from the air outlet 7 of the hot air gun 14 can reach the preset temperature.

[0077] In this embodiment, the control host 1 automatically adjusts the temperature based on the second temperature value, wind speed, and first temperature value to ensure that the second temperature value reaches the preset temperature value, including:

[0078] The control host 1 first controls the working power of the hot air gun 14 according to the preset temperature value, so that the first temperature value at the air outlet 7 of the hot air gun 14 reaches the preset temperature value.

[0079] Calculate the temperature difference between the second temperature value measured by placing the hot air gun 14 on the temperature calibration device 15 and the preset temperature value;

[0080] Based on the temperature difference, the control host 1 controls the working power of the hot air gun 14 so that the second temperature value reaches the preset temperature value.

[0081] Record the third temperature value and wind speed at point 7 of the hot air gun 14 at this time;

[0082] Before the next temperature calibration, the control host 1 controls the temperature at the air outlet 7 of the hot air gun 14 to be maintained at the third temperature value at this wind speed, and determines that the temperature at the bimetallic strip 8 reaches the preset temperature value.

[0083] This invention can simultaneously measure the temperature and wind speed at the bimetallic strip 8, and automatically calibrate the temperature using the temperature and wind speed values. Compared with existing technologies, it is very convenient to use.

[0084] In this embodiment, during the initial temperature calibration, since only the temperature at the air outlet 7 of the hot air gun 14 is controlled to reach the preset temperature value, the temperature at the welding point at a certain distance from the air outlet 7 of the hot air gun 14 is much lower than the preset temperature value, and the automatic temperature calibration time is relatively long.

[0085] Therefore, in this embodiment, a temperature compensation model can be preset in the control host 1. Based on the input preset temperature, wind speed, and distance from the air outlet 7 of the hot air gun 14 to the welding point, it can be estimated how much the temperature at the air outlet 7 of the hot air gun 14 needs to be adjusted to so that the temperature at the welding point at a certain distance from the air outlet 7 of the hot air gun 14 reaches the preset temperature value.

[0086] Specifically, the following was conducted: Temperature values ​​(T) at point 7 of the hot air gun's outlet were simultaneously recorded at different settings (temperature, fan speed). set ), Measured temperature value of bimetallic strip 8 (T) actual ) and wind speed (V).

[0087] The relationship between temperature decay and wind speed can be analyzed by repeating tests at different distances. Through analysis, it can be seen that wind speed and distance are the main factors affecting the measured temperature value of the bimetallic strip.

[0088] Then, by linear regression or polynomial fitting, T is established. actual = f(T set The temperature compensation model for V and d) is calculated using the following formula:

[0089] T actual =a·T set +b·V+c·d+offset

[0090] Where a, b, and c represent fitting coefficients, d represents the distance between the air outlet 7 of the hot air gun 14 and the welding point, and offset represents the offset amount.

[0091] The temperature compensation model is first written into the control host 1. Based on the input preset temperature, wind speed, and distance, the estimated output temperature at the air outlet 7 of the hot air gun 14 is obtained. The control host 1 then controls the hot air gun 14 to operate so that the temperature at the air outlet 7 reaches this temperature. At this time, the temperature at the air outlet 7 of the hot air gun 14, which is a certain distance from the welding point, is very close to the preset temperature.

[0092] The control host 1 automatically calibrates the temperature according to the second temperature value, wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value, including: the control host 1 inputs the preset temperature, wind speed and distance into the pre-built temperature calibration compensation model to obtain the estimated output temperature at the air outlet 7 of the hot air gun 14.

[0093] The control host 1 controls the hot air gun 14 to work so that the temperature at the air outlet 7 reaches the specified temperature.

[0094] Then, the temperature difference between the second temperature value measured by placing the hot air gun 14 on the temperature calibration device 15 and the preset temperature value is calculated; at this time, the temperature difference is less than the temperature difference between the second temperature value and the preset temperature value measured after directly adjusting the temperature at the air outlet 7 of the hot air gun 14 to the preset temperature value.

[0095] Based on the temperature difference, the control host 1 controls the working power of the hot air gun 14 so that the second temperature value reaches the preset temperature value.

[0096] Record the third temperature value and wind speed at point 7 of the hot air gun 14 at this time;

[0097] Before the next temperature calibration, the control host 1 controls the temperature at the air outlet 7 of the hot air gun 14 to be maintained at the third temperature value at this wind speed, and determines that the temperature at the bimetallic strip 8 reaches the preset temperature value.

[0098] This invention enables faster temperature calibration through this method. Furthermore, the temperature calibration compensation model can be updated using the measured wind speed and the second temperature value of the bimetallic strip 8, thereby ensuring that the corrected temperature is closer to the set temperature and preventing error expansion.

[0099] In another specific embodiment, the hot air gun 14 includes a handle housing 2 with an internal cavity and a heating element 3 disposed inside the handle housing 2;

[0100] One end of the handle housing 2 is provided with an air outlet 7;

[0101] The other end of the handle housing 2 is provided with an air inlet 16 for connecting to the second air outlet 13 of the blower 12;

[0102] The infrared transmitter 6 and the infrared receiver 4 are respectively disposed on both sides of the handle housing 2, and the infrared transmitter 6 and the infrared receiver 4 are positioned facing the air outlet 7 of the handle housing 2.

[0103] The temperature sensor 5 is fixed on the heating core 3 and located at the air outlet 7 of the handle housing 2.

[0104] In this embodiment, the blower 12 is electrically connected to the control host 1. The control host 1 controls the blower 12 to generate air at a certain speed, which is input into the air inlet 16 of the handle housing 2 through a pipe, and then generates hot air through the heating element 3. Finally, the hot air at a certain speed is output from the air outlet 7 of the handle housing 2. Workers use this hot air to perform welding and other work.

[0105] The infrared transmitter 6 can emit square wave signals, sine wave signals, triangular wave signals, etc., specifically waveform signals with a certain frequency and amplitude. In fact, the waveform signal emitted each time can be different. Preferably, the control host 1 controls the infrared transmitter 6 to emit square waves. The square wave emitted by the infrared transmitter 6 undergoes diffuse reflection on the bimetallic strip 8 and is received by the infrared receiver 4.

[0106] In one specific embodiment, the temperature calibration device 15 includes a fixed base 9 and a support frame 10;

[0107] The bimetallic sheet 8 is set in the middle of the fixed base 9 by a ceramic heat insulation bracket 11;

[0108] The support frame 10 is mounted on the fixed base 9, and the support frame 10 is provided with a fixed bracket for supporting the hot air gun 14. The fixed bracket is located above the bimetallic sheet 8 and is at a certain distance from it.

[0109] When the hot air gun 14 is placed on the fixed frame, the air outlet 7 of the hot air gun 14 is at a certain distance from the bimetallic strip 8.

[0110] The mounting bracket has a ring-shaped structure. The handle housing 2 of the hot air gun 14 is composed of two cylinders with different diameters. The infrared emitter 6 and the infrared receiver 4 are both located on both sides of the cylinder with the smaller diameter. The heating element 3 is located inside the cylinder with the relatively smaller diameter.

[0111] The diameter of the relatively larger cylinder is greater than the inner ring diameter of the fixing frame; the diameter of the relatively smaller cylinder is smaller than the inner ring diameter of the fixing frame. When placing the hot air gun 14, the relatively smaller cylinder passes through the inner ring of the fixing frame and is secured to the fixing frame by the relatively larger cylinder.

[0112] In this embodiment, the handle housing 2 of the hot air gun 14 is provided with a temperature calibration button 17. The temperature calibration button 17 is electrically connected to the control host 1. When the control host 1 receives the temperature calibration signal sent by the temperature calibration button 17, the temperature calibration program is started.

[0113] In this invention, the control host 1 is also provided with a display module and a data input model; both the display module and the data input model are electrically connected to the control host 1; the display model is used to display information such as the first temperature value measured by the temperature sensor 5, the preset temperature value, the second temperature value at the bimetallic strip 8, and / or the wind speed.

[0114] The data input model allows users to input preset temperature values ​​and / or wind speeds via physical or virtual buttons.

[0115] The preset temperature value mentioned above refers to the temperature at the welding point at a certain distance from the air outlet 7 of the hot air gun 14.

[0116] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic temperature calibration system for a hot air gun, characterized in that: Includes a hot air gun (14) for blowing out hot air, an infrared emitter (6) and an infrared receiver (4) respectively installed on both sides of the hot air gun (14), a control host (1) for controlling the hot air gun (14) to blow out hot air at a preset temperature, and a temperature calibration device (15) for fixing and calibrating the temperature of the hot air gun (14). The hot air gun (14) is equipped with a temperature sensor (5) for measuring the temperature of the air outlet (7) of the hot air gun (14); the temperature sensor (5) sends the measured first temperature value to the control host (1). The temperature calibration device (15) is provided with a bimetallic strip (8) made of different materials. When the hot air gun (14) is placed on the temperature calibration device (15), the bimetallic strip (8) and the air outlet (7) of the hot air gun (14) are at a certain distance. The infrared transmitter (6) and infrared receiver (4) are both electrically connected to the control host (1); During automatic temperature calibration, the hot air gun (14) is placed on the temperature calibration device (15), and the control host (1) controls the first temperature value at the air outlet (7) of the hot air gun (14) through the temperature sensor (5). The control host (1) controls the infrared transmitter (6) to transmit waveform signals to the bimetallic strip (8), and the infrared receiver (4) receives two different reflected waveform signals reflected back from different metal plates on the bimetallic strip (8); the control host (1) obtains the second temperature value of the bimetallic strip (8) and the wind speed at the bimetallic strip (8) based on the two different reflected waveform signals. The control host (1) automatically adjusts the temperature according to the second temperature value, wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value; The control host (1) acquires the second temperature value of the bimetallic strip (8) and the wind speed at the bimetallic strip (8) based on two different reflected waveform signals, including: Based on the relationship between the amplitude of the reflected waveform signal and the temperature, the second temperature value of the bimetallic sheet (8) is calculated using one of the reflected waveform signals; Based on the wind speed model, the wind speed at the bimetallic strip (8) was calculated using two different reflected waveform signals.

2. The automatic temperature calibration system for a hot air gun according to claim 1, characterized in that: The control host (1) automatically adjusts the temperature based on the second temperature value, wind speed, and first temperature value, so that the second temperature value reaches the preset temperature value, including: The control host (1) first controls the working power of the hot air gun (14) according to the preset temperature value, so that the first temperature value at the air outlet (7) of the hot air gun (14) reaches the preset temperature value. Calculate the temperature difference between the second temperature value measured by placing the hot air gun (14) on the temperature calibration device (15) and the preset temperature value; Based on the temperature difference, the control host (1) controls the working power of the hot air gun (14) so ​​that the second temperature value reaches the preset temperature value; Record the third temperature value and wind speed at the air outlet (7) of the hot air gun (14) at this time; Before the next temperature calibration, the control host (1) controls the temperature at the air outlet (7) of the hot air gun (14) to be maintained at the third temperature value at the wind speed, and determines that the temperature at the bimetallic strip (8) reaches the preset temperature value.

3. The automatic temperature calibration system for a hot air gun according to claim 1, characterized in that: The control host (1) automatically adjusts the temperature according to the second temperature value, wind speed and the first temperature value, so that the second temperature value reaches the preset temperature value, including: the control host (1) inputs the input preset temperature, wind speed and distance into the pre-built temperature adjustment compensation model to obtain the estimated output temperature at the air outlet (7) of the hot air gun (14); The control host (1) controls the hot air gun (14) to work so that the temperature value at the air outlet (7) reaches the specified temperature; Calculate the temperature difference between the second temperature value measured by placing the hot air gun (14) on the temperature calibration device (15) and the preset temperature value; at this time, the temperature difference is less than the temperature difference between the second temperature value measured after directly adjusting the temperature at the air outlet (7) of the hot air gun (14) to the preset temperature value and the preset temperature value. Based on the temperature difference, the control host (1) controls the working power of the hot air gun (14) so ​​that the second temperature value reaches the preset temperature value; Record the third temperature value and wind speed at the air outlet (7) of the hot air gun (14) at this time; Before the next temperature calibration, the control host (1) controls the temperature at the air outlet (7) of the hot air gun (14) to be maintained at the third temperature value at the wind speed, and determines that the temperature at the bimetallic strip (8) reaches the preset temperature value.

4. The automatic temperature calibration system for a hot air gun according to claim 1, characterized in that: The hot air gun (14) includes a handle housing (2) with an internal cavity and a heating element (3) disposed inside the handle housing (2). An air outlet (7) is provided at one end of the handle housing (2); The other end of the handle housing (2) is provided with an air inlet (16) for connecting to the second air outlet (13) of the blower (12); The infrared transmitter (6) and infrared receiver (4) are respectively arranged on both sides of the handle shell (2), and the infrared transmitter (6) and infrared receiver (4) are arranged facing the air outlet (7) of the handle shell (2). The temperature sensor (5) is fixed on the heating core (3) and located at the air outlet (7) of the handle housing (2).

5. The automatic temperature calibration system for a hot air gun according to claim 1, characterized in that: The temperature calibration device (15) includes a fixed base (9) and a support frame (10); The bimetallic sheet (8) is set in the middle of the fixed base (9) by a ceramic heat insulation bracket (11); The support frame (10) is set on the fixed base (9), and the support frame (10) is provided with a fixed frame for supporting the hot air gun (14). The fixed frame is located above the bimetallic sheet (8) and is at a certain distance. When the hot air gun (14) is placed on the fixed frame, the air outlet (7) of the hot air gun (14) is at a certain distance from the bimetallic strip (8).

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