Hair curler

Abstract

The utility model relates to a hair curler which comprises a heating structure and a temperature control circuit. The multiple heating wires are stacked one by one or horizontally arranged and insulated from one another so as to adapt to the structural design of different hair curlers, and processing and manufacturing are convenient. One or more heating wires are embedded into the heating rod and are insulated from the heating rod, so that the safety is improved; the heating rod is used for guiding heat energy emitted by the one or more heating wires to the side surface so as to heat hair; the sub-control circuit controls the on-off of the heating wire, the thermistor detects the temperature of the heating body, and the display screen displays the temperature of the heating body, so that the intelligent degree is improved; the main control chip controls the sub-control circuit to work and controls the display screen to perform corresponding display according to the temperature detected by the thermistor; the sub-control circuits and the heating wires also support 110V alternating-current mains supply or 220V alternating-current mains supply so as to adapt to the use requirements of the mains supply of different countries; therefore, high safety, high stability, small size, low cost and convenience in processing and manufacturing are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to curling iron's heating structure and circuit technical field, more specifically, relate to a curling iron. BACKGROUND

[0002] The existing curling iron's heating structure mostly is winding and setting heating wire on the ceramic rod to heat, and it has the problems of complex manufacturing process, high cost and poor safety;

[0003] And the heating circuit of the curling iron mostly uses self-recovery temperature fuse and switch to realize temperature control, and has no temperature display function, and has the problems of low intelligent degree and unable to meet people's use demand. UTILITY MODEL CONTENTS

[0004] The utility model solves the technical problem in, aiming at the above-mentioned defects of prior art, provide a curling iron with simple structure, simple circuit, low cost and high intelligent degree.

[0005] The utility model solves the technical problems by adopting the technical scheme of:

[0006] A curling iron is constructed, which comprises:

[0007] A main body;

[0008] A heating structure arranged in the main body, the heating structure comprising one or more heating wires and a heating rod, the plurality of heating wires being arranged in one over another or horizontally and insulated from each other, the one or more heating wires being embedded in the heating rod and insulated from the heating rod, and the heating rod guiding the heat energy emitted by the one or more heating wires to the side surface;

[0009] A temperature control circuit arranged in the main body;

[0010] The temperature control circuit comprises a sub-control circuit for controlling the on-off of the heating wire, a thermistor and a display screen, the thermistor detecting the temperature of the heating body, and the display screen displaying the temperature of the heating body; the sub-control circuit, the thermistor and the display screen are connected with a main control chip;

[0011] The sub-control circuit inputs alternating current mains, the alternating current mains comprising 110V alternating current mains or 220V alternating current mains; the heating wire supports the input of the 110V alternating current mains or the 220V alternating current mains.

[0012] The curling iron, wherein the heating structure further comprises a first ceramic sheet and a second ceramic sheet;

[0013] A plurality of the heating wires are horizontally arranged between the first ceramic sheet and the second ceramic sheet, and the first ceramic sheet and the second ceramic sheet cooperate to clamp a plurality of the heating wires to form the heating body.

[0014] The first ceramic sheet and the second ceramic sheet are fixedly connected.

[0015] The heating structure further comprises one or more insulating plates and the first ceramic sheet and the second ceramic sheet.

[0016] A plurality of the heating wires are one-to-one spaced and stacked with one or more insulating plates, and are clamped by the first ceramic sheet and the second ceramic sheet to form the heating body.

[0017] The insulating plate is fixedly connected with the adjacent insulating plate, and the first ceramic sheet or the second ceramic sheet is fixedly connected with the insulating plate.

[0018] The curling iron further comprises a self-recovery temperature fuse.

[0019] The self-recovery temperature fuse is located in the heating body or close to the heating body.

[0020] The heating body is embedded in the heating rod and is mutually insulated with the heating rod.

[0021] The thermistor is located in the heating body or close to the heating body.

[0022] The curling iron further comprises a main control circuit connected in series between the alternating current and the sub-control circuit, and the self-recovery temperature fuse is connected in series between the alternating current and the main control circuit.

[0023] The heating wire comprises a first heating coil and a second heating coil, one end of the first heating coil is connected with one end of the second heating coil and is a common end of the heating wire, the other end of the first heating coil is a one-level input end of the heating wire, and the other end of the second heating coil is a two-level input end of the heating wire.

[0024] The main control circuit comprises a first silicon-controlled photocoupler and a first thyristor, and the sub-control circuit comprises a second silicon-controlled photocoupler, a third silicon-controlled photocoupler, a second thyristor and a third thyristor.

[0025] One end of the self-restoration temperature fuse is connected with a live wire of the alternating mains and the other end is connected with a first main electrode of the first thyristor, a second main electrode of the first thyristor is connected with a first main electrode of the second thyristor and a first main electrode of the third thyristor respectively, a second main electrode of the second thyristor is connected with a one-grade input end of the heating wire, and a second main electrode of the third thyristor is connected with a two-grade input end of the heating wire;

[0026] The gate electrode of the first thyristor is connected with a first resistor and a second resistor respectively, the other end of the first resistor is connected with a first main electrode of a back light detector of the first silicon controlled photocoupler, a second main electrode of the back light detector of the first silicon controlled photocoupler is connected with the gate electrode of the first thyristor, and the other end of the second resistor is connected with a second main electrode of the first thyristor;

[0027] The second main electrode of the first thyristor is connected with a third resistor, the other end of the third resistor is connected with a first main electrode of a back light detector of the second silicon controlled photocoupler and a first main electrode of a back light detector of the third silicon controlled photocoupler respectively, a second main electrode of the back light detector of the second silicon controlled photocoupler is connected with a gate electrode of the second thyristor and is further connected with a fourth resistor, the other end of the fourth resistor is connected with a second main electrode of the second thyristor, a second main electrode of the back light detector of the third silicon controlled photocoupler is connected with a gate electrode of the third thyristor and is further connected with a fifth resistor, and the other end of the fifth resistor is connected with a second main electrode of the third thyristor;

[0028] The common end of the heating wire is connected with a current detection resistor and a sixth resistor, the other end of the current detection resistor is connected with a zero line of the alternating mains, and the other end of the sixth resistor is connected with the main control chip;

[0029] The positive electrode of a light emitting diode of the first silicon controlled photocoupler, the positive electrode of a light emitting diode of the second silicon controlled photocoupler and the positive electrode of a light emitting diode of the third silicon controlled photocoupler are all connected with the positive electrode of 5V direct current, the negative electrode of the light emitting diode of the first silicon controlled photocoupler, the negative electrode of the light emitting diode of the second silicon controlled photocoupler and the negative electrode of the light emitting diode of the third silicon controlled photocoupler are all connected with the main control chip.

[0030] The negative electrode of 5V direct current is connected with the thermistor and the other end is connected with the main control chip and is further connected with a seventh resistor, and the other end of the seventh resistor is connected with the positive electrode of 5V direct current;

[0031] Further comprising: a voltage detection circuit and a zero point detection circuit, the voltage detection circuit comprises an eighth resistor and a ninth resistor, and the zero point detection circuit comprises a tenth resistor and a diode.

[0032] The eighth resistor is connected with the live wire of the AC mains and the other end is connected with the master control chip and the ninth resistor, and the other end of the ninth resistor is connected with the zero line of the AC mains;

[0033] The tenth resistor is connected with the live wire of the AC mains and the other end is connected with the master control chip and the positive electrode of the diode, and the negative electrode of the diode is connected with the zero line of the AC mains.

[0034] The curling device, wherein the master control chip supports analog input;The display screen is connected with the master control chip.

[0035] The curling device, wherein the main body is further provided with a pressing assembly, and the pressing assembly comprises: an arc plate, a torsion spring and a pressing handle.

[0036] The arc surface of the arc plate faces the heating rod and is parallel to each other, the arc plate is fixedly connected with the pressing handle, one end of the pressing handle is arranged in the fixed column, the torsion spring is sleeved on the fixed column, and the torsion spring pops up the pressing handle and uses the arc plate to approach or adhere to the side surface of the heating rod.

[0037] The fixed column is located in the main body and is fixedly connected with the main body;One end of the pressing handle sleeved on the fixed column extends into the main body.

[0038] The curling device has the advantages that: a plurality of heating wires are arranged in one-to-one or horizontally and are insulated from each other, so as to adapt to the structural design requirements of different curling devices and facilitate processing and manufacturing;One or more heating wires are embedded in the heating rod and are insulated from each other, so as to improve safety and reduce cost;The heating rod guides the heat energy emitted by the one or more heating wires to the side surface, so as to heat the hair.

[0039] The sub-control circuit controls the on-off of the heating wire, compared with directly controlling the on-off of the AC mains by using a switch, the safety and stability are greatly improved;The thermistor detects the temperature of the heating body, and the display screen displays the temperature of the heating body, so as to improve the intelligent degree;The master control chip controls the work of the sub-control circuit, and controls the display screen to display and control the work of the sub-control circuit according to the temperature detected by the thermistor;

[0040] Further, the sub-control circuit and the heating wire also support 110V AC mains or 220V AC mains, so as to adapt to the use requirements of mains in different countries;Thus, the structure and circuit are simple, the safety is high, the stability is strong, the volume is small, the cost is low, and the processing and manufacturing are facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative effort fall within the protection scope of the present application.

[0042] Figure 1 is a three-dimensional view of the curling iron of the preferred embodiment of the present application;

[0043] Figure 2 is a sectional view of the curling iron of the preferred embodiment of the present application;

[0044] Figure 3 is an explosion view of the heating wire in the heating body of the curling iron of the preferred embodiment of the present application, which is arranged in one-to-one stacking;

[0045] Figure 4 is an explosion view of the heating wire in the heating body of the curling iron of the preferred embodiment of the present application, which is arranged horizontally;

[0046] Figure 5 is a circuit principle diagram of the sub-control circuit, the main control circuit, the voltage detection circuit and the zero point detection circuit of the curling iron of the preferred embodiment of the present application;

[0047] Figure 6 is a circuit principle diagram of the thermistor of the curling iron of the preferred embodiment of the present application;

[0048] Figure 7 is a circuit principle of the display screen of the curling iron of the preferred embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative effort fall within the protection scope of the present application.

[0050] The curling iron of the preferred embodiment of the present application is shown in Figure 1 , and reference is made to Figures 2 to 7 ; which comprises:

[0051] a main body 100;

[0052] The heating structure 110 is arranged on the main body 100. The heating structure 110 comprises one or more heating wires M2 and a heating rod 112. The plurality of heating wires M2 are arranged in one-on-one stacking or horizontal arrangement and are insulated from each other. The one or more heating wires M2 are embedded in the heating rod 112 and are insulated from the heating rod 112. The heating rod 112 guides the heat energy emitted by the one or more heating wires M2 to the side surface. Further, the heating structure 110 further comprises a high-temperature protection sleeve 113 arranged on the heating rod 112.

[0053] The temperature control circuit (as shown in Figures 3 to 5 ) is arranged on the main body 100.

[0054] The temperature control circuit comprises a sub-control circuit 210 for controlling the on-off of the heating wire M2, a thermistor NTC, and a display screen LED1. The thermistor NTC detects the temperature of the heating body 120. The display screen LED1 displays the temperature of the heating body 120. The sub-control circuit 210, the thermistor NTC, and the display screen LED1 are connected with a main control chip (not shown in the figure).

[0055] The sub-control circuit 210 inputs alternating current (AC) mains. The AC mains comprises 110V AC mains or 220V AC mains. The heating wire M2 supports the input of 110V AC mains or 220V AC mains.

[0056] The plurality of heating wires M2 are arranged in one-on-one stacking or horizontal arrangement and are insulated from each other, so as to adapt to the structural design requirements of different curling irons and facilitate processing and manufacturing. The one or more heating wires M2 are embedded in the heating rod 112 and are insulated from the heating rod 112, which improves safety and is low in cost. The heating rod 112 guides the heat energy emitted by the one or more heating wires M2 to the side surface, so as to heat the hair.

[0057] The sub-control circuit 210 controls the on-off of the heating wire M2. Compared with directly controlling the on-off of the AC mains by using a switch, the safety and stability are greatly improved. The thermistor NTC detects the temperature of the heating body 120. The display screen LED1 displays the temperature of the heating body 120, so as to improve the intelligent degree. The main control chip controls the work of the sub-control circuit 210 and controls the display screen LED1 to display correspondingly and controls the work of the sub-control circuit 210 according to the temperature detected by the thermistor NTC.

[0058] Further, the sub-control circuit 210 and the heating wire M2 both support 110V AC mains or 220V AC mains, so as to adapt to the use requirements of mains in different countries. Thus, the curling iron has the advantages of simple structure, simple circuit, high safety, strong stability, small size, low cost, and easy processing and manufacturing.

[0059] As shown in Figure 1 , Figure 2 andFigure 4 and Figure 5 As shown in the figure, the heat generating structure 110 further comprises a first ceramic sheet 114 and a second ceramic sheet 115;

[0060] The plurality of heat generating wires M2 are horizontally arranged between the first ceramic sheet 114 and the second ceramic sheet 115, and the first ceramic sheet 114 and the second ceramic sheet 115 cooperate to clamp the plurality of heat generating wires M2 to form a heat generating body 120;

[0061] The first ceramic sheet 114 and the second ceramic sheet 115 are fixedly connected; this kind of scheme has a thinner and wider heat generating body 120, which is suitable for different curling iron structures.

[0062] As shown in the figure, Figure 1 , Figure 2 and Figure 3 and Figure 5 As shown in the figure, the heat generating structure 110 further comprises one or more insulating plates 116 and the first ceramic sheet 114 and the second ceramic sheet 115;

[0063] The plurality of heat generating wires M2 and the one or more insulating plates 116 are one-to-one spaced and stacked, and are clamped by the first ceramic sheet 114 and the second ceramic sheet 115 to form the heat generating body 120;

[0064] The insulating plate 116 is fixedly connected with the adjacent insulating plate 116, and the first ceramic sheet 114 or the second ceramic sheet 115 is fixedly connected with the insulating plate 116; this kind of scheme has a thicker and narrower heat generating body 120, which is suitable for different curling iron structures.

[0065] As shown in the figure, Figures 3 to 5 Further comprising a self-resetting temperature fuse TF1;

[0066] The self-resetting temperature fuse TF1 is located in or close to the heat generating body 120; it meets different structural design and use requirements.

[0067] As shown in the figure, Figures 3 to 5 The heat generating body 120 is embedded in the heat generating rod 112 and is insulated from the heat generating rod 112;

[0068] The thermistor NTC is located in or close to the heat generating body 120; it meets different structural design and use requirements.

[0069] It should be noted that the lead wires of the self-resetting temperature fuse TF1, the thermistor NTC, and the heat generating wire M2 all pass out of the first ceramic sheet 114 or the second ceramic sheet 115.

[0070] As shown in the figure, Figures 3 to 6As shown, the AC mains and the sub-control circuit 210 are connected in series with the main control circuit 220, and the AC mains and the main control circuit 220 are connected in series with the self-recovery temperature fuse TF1; the main control circuit 220 is used for secondary power-off protection of the heating wire M2 and is controlled by the main control chip, and the self-recovery temperature fuse TF1 is used for secondary over-temperature protection relative to the thermistor NTC, thereby realizing redundant protection and improving safety;

[0071] The heating wire M2 comprises: a first heating coil 111 and a second heating coil 112, one end of the first heating coil 111 is connected with one end of the second heating coil 112 and is a common end of the heating wire M2, the other end of the first heating coil 111 is a one-gear input end of the heating wire M2, and the other end of the second heating coil 112 is a two-gear input end of the heating wire M2; that is, when 110V AC mains is input, the main control circuit controls the first heating coil 111 of the heating wire M2 to work through the sub-control circuit 210, and vice versa, that is, when 220V AC mains is input, the main control circuit controls the second heating coil 112 of the heating wire M2 to work.

[0072] As shown in the figure, Figures 3 to 6 The main control circuit 220 comprises: a first silicon-controlled photocoupler U6 and a first thyristor TR1, and the sub-control circuit 210 comprises: a second silicon-controlled photocoupler U5, a third silicon-controlled photocoupler U4, a second thyristor TR2, and a third thyristor TR4;

[0073] One end of the self-recovery temperature fuse TF1 is connected with the fire wire of the AC mains, and the other end is connected with the first main electrode of the first thyristor TR1; the second main electrode of the first thyristor TR1 is connected with the first main electrode of the second thyristor TR2 and the first main electrode of the third thyristor TR4, respectively; the second main electrode of the second thyristor TR2 is connected with the one-gear input end of the heating wire M2, and the second main electrode of the third thyristor TR4 is connected with the two-gear input end of the heating wire M2;

[0074] The gate of the first thyristor TR1 is connected with the first resistor R31 and the second resistor R30, respectively; the other end of the first resistor R31 is connected with the first main electrode of the back light detector of the first silicon-controlled photocoupler U6; the second main electrode of the back light detector of the first silicon-controlled photocoupler U6 is connected with the gate of the first thyristor TR1; and the other end of the second resistor R30 is connected with the second main electrode of the first thyristor TR1;

[0075] The second main electrode of the first thyristor TR1 is connected with the third resistor R9, the other end of the third resistor R9 is connected with the first main electrode of the back light detector of the second silicon controlled photocoupler U5 and the first main electrode of the back light detector of the third silicon controlled photocoupler U4 respectively; the second main electrode of the back light detector of the second silicon controlled photocoupler U5 is connected with the gate of the second thyristor TR2 and also connected with the fourth resistor R10, the other end of the fourth resistor R10 is connected with the second main electrode of the second thyristor TR2; the second main electrode of the back light detector of the third silicon controlled photocoupler U4 is connected with the gate of the third thyristor TR4 and also connected with the fifth resistor R24, the other end of the fifth resistor R24 is connected with the second main electrode of the third thyristor TR4;

[0076] The common end of the heating wire M2 is connected with the current detection resistor R25 and the sixth resistor R26, the other end of the current detection resistor R25 is connected with the zero line of the alternating current mains, the other end of the sixth resistor R26 is connected with the main control chip;

[0077] The positive pole of the light emitting diode Z1 of the first silicon controlled photocoupler U6, the positive pole of the light emitting diode Z1 of the second silicon controlled photocoupler U5 and the positive pole of the light emitting diode Z1 of the third silicon controlled photocoupler U4 are all connected with the positive pole of the 5V direct current, the negative pole of the light emitting diode Z1 of the first silicon controlled photocoupler U6, the negative pole of the light emitting diode Z1 of the second silicon controlled photocoupler U5 and the negative pole of the light emitting diode Z1 of the third silicon controlled photocoupler U4 are all connected with the main control chip; the circuit is simple, the cost is low, the volume is small, the silicon controlled photocoupler is used for high and low voltage isolation, and the stability of the circuit is improved.

[0078] As shown in Figure 5 and Figure 6 The negative pole of the 5V direct current is connected with the thermistor NTC, the other end of the thermistor NTC is connected with the main control chip and also connected with the seventh resistor R34, the other end of the seventh resistor R34 is connected with the positive pole of the 5V direct current;

[0079] Further comprising: a voltage detection circuit 230 and a zero point detection circuit 240, the voltage detection circuit 230 comprises: an eighth resistor R8 and a ninth resistor R11, the zero point detection circuit 240 comprises: a tenth resistor R27 and a diode Z1;

[0080] The eighth resistor R8 is connected with the live wire of the alternating current mains and the other end of the eighth resistor R8 is connected with the main control chip and the ninth resistor R11, the other end of the ninth resistor R11 is connected with the zero line of the alternating current mains;

[0081] The tenth resistor R27 is connected with the live wire of the AC mains and the other end is connected with the positive pole of the main control chip and the diode Z1, the negative pole of the diode Z1 is connected with the zero line of the AC mains; the voltage detection circuit 230 is used for detecting the voltage of the AC mains, and the main control chip is used for judging whether it is 110V AC input or 220V AC input; the zero point detection circuit 240 is used for detecting whether the waveform of the AC mains is at zero, and when it is at zero, the main control chip can control the main control circuit 220 or the sub-control circuit 210 to be disconnected.

[0082] As shown in Figure 7 , the main control chip supports analog input; the display screen LED1 is connected with the main control chip; wherein, the model of the main control chip is STC8H2K32U, and the model of the display screen LED1 is RF2352R.

[0083] As shown in Figure 1 and Figure 2 , the main body 100 is further provided with a pressing and releasing assembly 200, the pressing and releasing assembly 200 comprises: an arc plate 210, a torsion spring 220 and a pressing handle 230;

[0084] The arc surface of the arc plate 210 faces the heat stick 112 and is parallel to each other, the arc plate 210 is fixedly connected with the pressing handle 230, one end of the pressing handle 230 is arranged on the fixed column 221, the torsion spring 220 is sleeved on the fixed column 221, and the torsion spring 220 pops up the pressing handle 230 to use the arc plate 210 to approach or adhere to the side surface of the heat stick 112;

[0085] The fixed column 221 is located in the main body 100 and is fixedly connected with the main body 100; one end of the pressing handle 230 sleeved on the fixed column 221 extends into the main body 100; after the pressing handle 230 is pressed downward, the arc plate 210 is pressed to be far away from the heat stick 112 to generate a space for putting in the hair to clamp the hair and adhere to the heat stick 112 for heating.

[0086] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the utility model.

Claims

1. A curling iron, characterized in that The application relates to a heating device, which comprises a main body, a heating structure arranged in the main body, a temperature control circuit arranged in the main body, and a heating body embedded in a heating rod and insulated from the heating rod. The heating structure comprises one or more heating wires and a heating rod, and the plurality of heating wires are arranged in one-by-one stacking or horizontally and are insulated from each other, and the one or more heating wires are embedded in the heating rod and are insulated from the heating rod, and the heating rod guides the heat energy emitted by the one or more heating wires to a side surface. The temperature control circuit comprises a sub-control circuit for controlling the on-off of the heating wires, a thermistor for detecting the temperature of the heating body, and a display screen for displaying the temperature of the heating body. The sub-control circuit is connected with a main control chip, and the thermistor and the display screen are also connected with the main control chip. The sub-control circuit inputs alternating current (AC) mains, and the AC mains comprises 110V AC mains or 220V AC mains. The heating structure further comprises a first ceramic sheet and a second ceramic sheet.

2. The curling iron of claim 1, wherein, The plurality of heating wires are horizontally arranged between the first ceramic sheet and the second ceramic sheet, and the first ceramic sheet and the second ceramic sheet clamp the plurality of heating wires to form the heating body. The first ceramic sheet is fixedly connected with the second ceramic sheet. The heating structure further comprises one or more insulating plates and the first ceramic sheet and the second ceramic sheet.

3. The curling iron of claim 2, wherein, The plurality of heating wires are arranged in one-by-one spacing stacking with the one or more insulating plates, and the first ceramic sheet and the second ceramic sheet clamp the plurality of heating wires to form the heating body. The insulating plate is fixedly connected with the adjacent insulating plate, and the first ceramic sheet or the second ceramic sheet is fixedly connected with the insulating plate. The application further comprises a self-recovery temperature fuse.

4. A hair curler according to claim 2 or 3, characterised in that, The self-recovery temperature fuse is located in the heating body or close to the heating body. The heating body is embedded in the heating rod and is insulated from the heating rod. The thermistor is located in the heating body or close to the heating body.

5. A hair curler according to claim 2 or 3, wherein The main control circuit is connected in series between the AC mains and the sub-control circuit, and the self-recovery temperature fuse is connected in series between the AC mains and the main control circuit. The heating wire comprises a first heating coil and a second heating coil, one end of the first heating coil is connected with one end of the second heating coil and is a common end of the heating wire, the other end of the first heating coil is a one-level input end of the heating wire, and the other end of the second heating coil is a two-level input end of the heating wire.

6. The curling iron of claim 4, wherein, The main control circuit comprises a first silicon-controlled photocoupler and a first thyristor, and the sub-control circuit comprises a second silicon-controlled photocoupler, a third silicon-controlled photocoupler, a second thyristor and a third thyristor. ​ 7. The curling iron of claim 6, wherein, ​ One end of the self-recovery temperature fuse is connected with a live wire of the alternating current mains and the other end is connected with a first main electrode of the first thyristor, a second main electrode of the first thyristor is connected with a first main electrode of the second thyristor and a first main electrode of the third thyristor respectively, a second main electrode of the second thyristor is connected with a one-grade input end of the heating wire, and a second main electrode of the third thyristor is connected with a two-grade input end of the heating wire; The gate electrode of the first thyristor is connected with a first resistor and a second resistor respectively, the other end of the first resistor is connected with a first main electrode of a back light detector of the first silicon controlled photocoupler, a second main electrode of the back light detector of the first silicon controlled photocoupler is connected with the gate electrode of the first thyristor, and the other end of the second resistor is connected with a second main electrode of the first thyristor; The second main electrode of the first thyristor is connected with a third resistor, the other end of the third resistor is connected with a first main electrode of a back light detector of the second silicon controlled photocoupler and a first main electrode of a back light detector of the third silicon controlled photocoupler respectively, a second main electrode of the back light detector of the second silicon controlled photocoupler is connected with a gate electrode of the second thyristor and is further connected with a fourth resistor, the other end of the fourth resistor is connected with a second main electrode of the second thyristor, a second main electrode of the back light detector of the third silicon controlled photocoupler is connected with a gate electrode of the third thyristor and is further connected with a fifth resistor, and the other end of the fifth resistor is connected with a second main electrode of the third thyristor; A current detection resistor and a sixth resistor are connected with a common end of the heating wire, the other end of the current detection resistor is connected with a zero line of the alternating current mains, and the other end of the sixth resistor is connected with the main control chip; The positive electrode of a light emitting diode of the first silicon controlled photocoupler, the positive electrode of a light emitting diode of the second silicon controlled photocoupler and the positive electrode of a light emitting diode of the third silicon controlled photocoupler are all connected with a positive electrode of 5V direct current, the negative electrode of the light emitting diode of the first silicon controlled photocoupler, the negative electrode of the light emitting diode of the second silicon controlled photocoupler and the negative electrode of the light emitting diode of the third silicon controlled photocoupler are all connected with the main control chip.

8. The curling iron of claim 7, wherein, The thermistor is connected with a negative electrode of the 5V direct current and the other end is connected with the main control chip and is further connected with a seventh resistor, and the other end of the seventh resistor is connected with a positive electrode of the 5V direct current; Further comprising: a voltage detection circuit and a zero point detection circuit, the voltage detection circuit comprises an eighth resistor and a ninth resistor, and the zero point detection circuit comprises a tenth resistor and a diode; The eighth resistor is connected with a live wire of the alternating current mains and the other end is connected with the main control chip and the ninth resistor, and the other end of the ninth resistor is connected with a zero line of the alternating current mains; The tenth resistor is connected with a live wire of the alternating current mains and the other end is connected with the main control chip and a positive electrode of the diode, and a negative electrode of the diode is connected with a zero line of the alternating current mains.

9. The curling iron of claim 8, wherein, The main control chip supports analog input, and the display screen is connected with the main control chip.

10. The curling iron of claim 1, wherein, The main body is further provided with a pressing and releasing assembly, which comprises an arc plate, a torsion spring and a pressing handle; The arc surfaces of the arc plate face the heat stick and are parallel to each other, the arc plate is fixedly connected with the pressing handle, one end of the pressing handle is arranged on a fixed column, the torsion spring is sleeved on the fixed column, and the torsion spring makes the pressing handle pop up and uses the arc plate to approach or abut against the side surface of the heat stick. The fixed column is located in the main body and is fixedly connected with the main body, and one end of the pressing handle sleeved on the fixed column extends into the main body.

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