Clamping device and hair straightener

Abstract

One end of an upper handle and one end of a lower handle are connected through a rotating shaft, the other end of the upper handle and the other end of the lower handle can be opened or closed relatively, a control panel, a button and a connecting line connected with the control panel are arranged in the upper handle or the lower handle, the connecting line supplies power to the hair straightener, and a gap is formed between the tail end of the upper handle and the lower handle. A lock catch assembly is arranged in the gap and comprises a lock key push button and a lock key moving along with the lock key push button. The maximum opening distance of the upper handle and the lower handle is conveniently adjusted by arranging the lock catch assembly between the upper handle and the lower handle, the upper handle is parallel to the upper end and the lower end of the lock catch end, movement of the lock key is convenient, locking and unlocking are easier, and dryness is avoided. Wherein an inverted buckle is arranged at the end part of the upper end surface of the lock catch, and a forward pushing force is applied to the lock key through the inverted buckle, so that the lock key cannot retreat after locking the handle, and a product is also prevented from being automatically opened after the lock key is locked. The heating assembly adopts an elastic piece mode, so that the heating piece is kept in contact with the heating surface, and the heat transfer efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of clamping devices and hair straighteners, and more particularly to a clamping device and hair straightener. Background Technology

[0002] A hair straightener, also known as an electric straightener, is a hair styling tool used to quickly straighten hair. Common hair straighteners have a V-shaped structure, consisting of two elongated plates arranged in a "V" shape. One end of the two plates is hinged together by a locking pin, while the other end can open and close. A pair of heating plates are positioned on the inner surfaces of the opening and closing ends of the two plates. The heating plates conduct heat to a metal or ceramic plate surface, typically set at around 200 degrees Celsius. This heat straightens the hair. Current hair straighteners cannot limit the opening angle during use, resulting in a large opening distance each time, which is inconvenient. At the same time, straighteners that limit the opening angle have complex structures or are inconvenient to use.

[0003] Chinese Patent Publication No. CN113729381A discloses a hair straightener comprising two clamping parts, one end of which is hinged to one end of the other clamping part, and a circuit board disposed within the first clamping part. Each clamping part has a stainless steel base, with the stainless steel bases on the two clamping parts facing each other. A graphene heating element is disposed on the side of either stainless steel base away from the other, and the graphene heating element is thermally conductively connected to the stainless steel base. The graphene heating element is in the form of a multi-segmented bent strip, and its two ends are electrically connected to the circuit board. This invention can improve the heating efficiency and heating speed of the hair straightener. However, the clamping angle of the hair straightener described in this patent is not adjustable, requiring a large opening angle or a certain amount of pressing to maintain a specific opening angle each time it is used, which is inconvenient.

[0004] Chinese Patent Publication No. CN216453795U discloses a hair straightener, the key technical points of which include an upper plate and a lower plate. A locking structure is provided at one end of the upper and lower plates, and a hinge shaft is slidably connected to the locking structure. The upper and lower plates are hinged together by the hinge shaft, which contains a torsion spring. The locking structure also has symmetrically arranged arc-shaped concave surfaces that match the end faces of the upper and lower plates. Limiting protrusions are also provided within the arc-shaped concave surfaces. The upper and lower plates also have blocking strips that match the limiting protrusions. The locking structure also has a limiting safety block that extends between the upper and lower plates. Limiting blocks that match the limiting safety blocks are also provided on the upper and lower plates. This invention has the advantages of lockable upper and lower plates and a simple and reliable locking structure; during use, the heating element can be tightly attached, providing a good clamping effect even for small amounts of hair. The patent limits the minimum opening distance for the merchant version and the overtime version, but does not limit the maximum distance. Therefore, the opening stroke is still relatively large when in use, which is inconvenient. Utility Model Content

[0005] The technical problem this invention aims to solve is that existing hair straighteners cannot limit the opening angle during use, resulting in a large opening stroke each time, which is inconvenient to use; at the same time, hair straighteners that limit the opening angle have relatively complex structures or are inconvenient to use. To address the above-mentioned deficiencies of the prior art, this invention provides a clamping device and a hair straightener.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A clamping device is constructed, including an upper handle and a lower handle. One end of the upper handle and the lower handle are connected by a pivot, and the other end can be opened or closed relative to each other. A gap is provided between the end of the upper handle and the lower handle. A locking assembly is provided in the gap. The locking assembly includes a locking button and a locking key that moves with the locking button. The locking button drives the locking key into the gap, changing the opening angle of the other end of the upper handle and the lower handle. A spring is also provided between the upper handle and the lower handle. When the upper handle and the lower handle move relative to each other and compress the spring, the spring returns to its original position, causing the clamping device to open.

[0008] Preferably, the upper handle is provided with an upper body locking post at its end, and the lower handle is provided with a lower body locking post corresponding to the upper body locking post. A gap is left between the upper body locking post and the lower body locking post. The locking key includes a locking end that slides into the gap. Different positions of the locking end sliding into the gap change the opening angle of the upper and lower handles. The lower end of the upper body locking post is provided with an inclined surface, and the upper end of the locking end is provided with an inclined surface corresponding to it.

[0009] Preferably, the inclined surface at the lower end of the upper body locking pin is parallel to the inclined surface at the upper end of the latch, the upper end of the lower body locking pin is parallel to the lower end of the latch, and the upper end of the latch is provided with a buckle. The upper body provides a thrust towards the pivot for the locking key through the buckle to prevent the locking key from moving backward.

[0010] The locking assembly also includes a tail cover connected to the upper body. The tail cover is positioned between the locking key push button and the locking key, and the tail cover is provided with a travel groove. The locking key push button moves within the travel groove to limit the travel of the locking key. The lower end face of the locking key push button is parallel to the upper end face of the tail cover.

[0011] Preferably, the upper body locking post is provided with stop posts on both sides, the height of the stop posts is greater than the height of the upper body locking post, and they generate a stopping force in the left and right direction of the locking end. The upper handle and the lower handle both include a body and a decorative piece provided on one side of the body. The decorative piece is connected to a plug. A face cover is provided on the other side of the body.

[0012] A hair straightener is constructed, comprising an upper handle and a lower handle arranged opposite to each other. One end of the upper handle and the lower handle are connected by a pivot, and the other end of each handle is equipped with a heating element that can open or close relative to each other. A control board connected to the heating element and a button connected to the control board are provided inside the upper handle or the lower handle. A connecting wire connected to the control board is provided on the upper handle or the lower handle, and the straightener is powered through the connecting wire to perform straightening operations. A gap is provided between the end of the upper handle and the lower handle, and a locking assembly is provided within the gap. The locking assembly includes a locking button and a locking key that moves with the locking button. By pushing the locking button, the locking key is moved into the gap, changing the opening angle of the other end of the upper and lower handles, thereby changing the distance between the two sets of heating elements. A spring is also provided between the upper handle and the lower handle. When the upper handle and the lower handle move relative to each other, bringing the heating elements closer together for straightening operations and compressing the spring, the spring returns to its original position, causing the clamping device to open and separating the two heating elements.

[0013] Preferably, the heating assembly includes a heating bracket connected to the upper handle and the lower handle, a heating element disposed within the heating bracket, and a heating element in contact with the heating element. The heating element is electrically connected to the control board and is heated by the control board. The heating element transfers heat to the heating element so that the heating element is heated and then used for direct heating.

[0014] Preferably, the heating bracket has protrusions on both sides, which are detachably connected to the upper and lower handles. An elastic element is provided between the heating element and the heating bracket. The heating bracket includes two sets of oppositely arranged locking blocks. The heating element has two sets of hanging ears opposite the locking blocks. The hanging ears and the locking blocks have opposite oblique contact surfaces. The two sides of the hanging ears are provided with locking slots corresponding to the locking blocks. The elastic element has elastic ends at both ends corresponding to the hanging ears, which push the heating element to contact the heating element.

[0015] A silicone pad is provided between the heating component and the upper handle, and a silicone pad is provided between the heating component and the lower handle.

[0016] Preferably, the upper handle is provided with an upper body locking post at its end, and the lower handle is provided with a lower body locking post corresponding to the upper body locking post. A gap is left between the upper body locking post and the lower body locking post. The locking key includes a locking end that slides into the gap. Different positions of the locking end sliding into the gap change the opening angle of the upper and lower handles. The lower end of the upper body locking post is provided with an inclined surface, and the upper end of the locking end is provided with an inclined surface corresponding to it.

[0017] Preferably, the inclined surface at the lower end of the upper body locking pin is parallel to the inclined surface at the upper end of the latch, the upper end of the lower body locking pin is parallel to the lower end of the latch, and the upper end of the latch is provided with a buckle. The upper body provides a thrust towards the pivot for the locking key through the buckle to prevent the locking key from moving backward.

[0018] The lower body locking pin is located in the middle of the lower body, and the other end of the lower body is connected to a tail cover. The connecting wire includes a female end located between the tail cover and the lower body, and a male end inserted into the female end. The male end is connected to a plug. The locking assembly also includes a tail cover connected to the upper body. The tail cover is located between the locking key push button and the locking key, and the tail cover is provided with a travel groove. The locking key push button moves within the travel groove to limit the travel of the locking key. The lower end face of the locking key push button is parallel to the upper end face of the tail cover. The locking key is located between the tail cover and the pressure cover.

[0019] Preferably, the upper body locking post is provided with stop posts on both sides, the height of the stop posts is greater than the height of the upper body locking post, and they generate a stopping force in the left and right directions of the locking end. The upper handle and the lower handle both include a body and a decorative piece provided on one side of the body. A plug is connected to the decorative piece. A cover is provided on the other side of the body. The plug has a striped groove, and the decorative piece has a recess in the middle. The plug is detachably connected to the decorative piece in the recess.

[0020] The beneficial effects of this utility model are as follows: A locking assembly between the upper and lower handles facilitates adjustment of the maximum opening distance between them. The lower end of the upper handle and the upper end of the lower handle are parallel to the upper and lower ends of the locking assembly, facilitating the movement of the locking key and making locking and unlocking easier without causing stiffness. The upper end of the locking assembly has an inverted buckle, which provides a forward pushing force to the locking key, preventing it from sliding back after locking the handle and avoiding automatic opening of the product. The heating assembly uses an elastic element to maintain contact between the heating element and the heating surface, increasing heat transfer. The protrusions also facilitate the disassembly of the heating assembly, and the internal silicone pad provides cushioning for its movement. Both the upper and lower handles are assembled using decorative parts and inserts, enhancing the product's aesthetics and making pressing operation more convenient. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of a hair straightener according to a preferred embodiment of the present invention;

[0023] Figure 2 This is a top view of the hair straightener according to a preferred embodiment of the present invention;

[0024] Figure 3 This is a preferred embodiment of the present utility model. Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0025] Figure 4 This is a preferred embodiment of the present utility model. Figure 4 Enlarged structural diagram at point A in the diagram;

[0026] Figure 5 This is an exploded structural diagram of a hair straightener according to a preferred embodiment of the present invention;

[0027] Figure 6 This is an exploded view of the upper handle of a preferred embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the connection between the upper body and the rotating shaft in a preferred embodiment of the present invention;

[0029] Figure 8 This is a preferred embodiment of the present utility model. Figure 7 Enlarged structural diagram at point B in the diagram;

[0030] Figure 9 This is a schematic diagram of the heating assembly of the preferred embodiment of the present invention, viewed from the front of the heating surface.

[0031] Figure 10 This is a preferred embodiment of the present utility model. Figure 9 Schematic diagram of the cross-sectional structure of the BB surface in the middle;

[0032] Figure 11 This is an exploded structural diagram of the heating assembly according to a preferred embodiment of the present invention;

[0033] Figure 12 This is an exploded view of the lower handle and locking assembly of a preferred embodiment of the present invention;

[0034] Figure 13 This is a three-dimensional structural diagram of the connection between the lower body and the locking assembly in a preferred embodiment of the present invention;

[0035] Figure 14 This is a schematic diagram of the connection between the lower body, the female end, and the pressure cap in a preferred embodiment of the present invention.

[0036] Figure 15 This is a schematic diagram of the axonometric structure of the lower body of the present utility model in a preferred embodiment;

[0037] Figure 16 This is a preferred embodiment of the present utility model. Figure 15 Enlarged structural diagram at point C;

[0038] Figure 17 This is an exploded view of the locking assembly of a preferred embodiment of the present invention;

[0039] Figure 18 This is a schematic diagram of the axial structure of the pressure cap according to a preferred embodiment of the present invention. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0041] A preferred embodiment of the present invention includes a clamping device and a hair straightener; such as... Figure 1-5 and Figure 12-15As shown, the device includes an upper handle 30 and a lower handle 31 connected at one end by a pivot 8 to form a clamping handle 3. Heating components 2 are provided on opposite sides of both the upper and lower handles. Because the pivot connects the upper and lower handles, their opposite ends can rotate relative to the pivot, causing the heating components to move towards each other. A control board 7 and corresponding buttons 6 are provided on opposite sides of the upper and lower handles near the pivot. The control board is connected to the heating components, and the buttons adjust the operating mode of the control board to change the heating state of the heating components. A connecting cable 4 is connected to the end of the clamping components. One end of the connecting cable is connected to a plug to power the hair straightener, and the other end is connected to the control board, thus enabling the hair straightener to be connected to mains power via the connecting cable. To facilitate control of the clamping angle of the upper handle 30 and the lower handle 31, a gap is left between the upper and lower handles near the ends of the rotating shaft. The hair straightener also includes a locking assembly 1, which can move within the gap to change the opening angle of the upper and lower handles. A spring is installed between the upper and lower handles. When the locking assembly is in the appropriate position, pressing the upper handle compresses the spring. Releasing the pressing force of the upper handle causes the spring to return the upper handle to its original position, making it convenient to use.

[0042] Specifically, such as Figure 6-7 As shown, the upper handle 30 includes an upper body 300. A hollow cavity is provided on the side of the upper body facing the lower handle, and the heating component 2 is placed inside this cavity. An upper decorative piece 301 is provided on the side of the upper body 300 away from the lower handle, and an upper insert 302 is provided on the upper decorative piece. The upper insert is connected to the upper decorative piece by a snap-fit ​​mechanism, facilitating the removal and replacement of the upper decorative piece. The upper decorative piece has a recessed center, and the upper insert is placed in the recess. The upper insert has horizontal striped grooves 3020. The upper decorative piece and upper insert enhance the aesthetics of the upper handle, and the striped grooves also increase the friction when pressing the upper handle. A top cover 304 is provided on the end of the upper body facing the lower handle, and the top cover is located near the pivot. The wires connecting the control board and the heating component are hidden through the top cover. Two sets of silicone pads 303 are provided between the hollow cavity and the heating component. The silicone pads provide a certain buffer space for the movement of the heating component when the hair straightener is working, facilitating operation.

[0043] Furthermore, such as Figure 5 and Figure 12-15As shown, the lower handle 31 has the same lower body 310, lower decorative piece 311, lower plug 312, and lower cover 314 as the upper handle, and will not be described again here. The difference is that the pivot 8 is located at the pivot end 3002 at the end of the upper handle, and the lower handle has a pivot hole 3002 in the middle corresponding to the pivot end. The pivot is placed in the pivot hole and pivot end to connect the upper and lower handles. At this time, there is still some space at the other end of the lower handle to connect with the connecting line 40, as well as to set up the locking assembly and tail cover and other components. The connecting line includes a female end 41 located in the lower body and a male end 40 inserted into the female end. The male end connects to the plug end, and the female end is fixed by the pressure cover 9, with the locking button placed above the pressure cover.

[0044] Furthermore, such as Figure 3-4 As shown, the latch assembly 1 includes a locking button 10 and a locking button 11 that moves with the locking button. The locking button is installed between the lower handle and the tail cover via the tail cover 5, and the upper end of the tail cover is connected to the locking button. The locking button moves with the push or pull of the locking button. An upper body locking post 3000 is provided at the end of the upper handle, and a lower body locking post 3100 is provided at the end of the lower handle. A gap is left between the upper and lower body locking posts. When the locking button is not moved to the gap, the opening angle of the upper and lower handles is at its maximum. When the locking button moves to different parts of the gap, the opening angle of the upper and lower handles gradually decreases. To facilitate the sliding of the latch end 110 within the gap, the upper end face 1101 of the latch is set as a slope, and the corresponding lower slope face 3001 of the upper body locking post is also inclined, making the locking button move more easily without jamming, and making locking and unlocking smoother. The upper end face 1101 of the latch has an un-overlocked section 1100. This overlock design prevents the beveled surfaces from easily sliding backward, increasing the stability of the latch. The overlock also provides a pushing force towards the pivot point to prevent the latch from sliding backward, ensuring the latch won't slide back after the handle is locked, thus preventing the product from automatically opening. Simultaneously, the overlock creates a slight gap between the upper and lower beveled surfaces, facilitating the latch's sliding in to lock the upper and lower handles. To further enhance ease of movement, the upper end face 1101 of the latch is parallel to the upper beveled surface 3001, and the lower end face 1102 of the latch is also parallel to the upper beveled surface 3101, making locking and unlocking easier and preventing jamming.

[0045] Furthermore, such as Figure 7-8 and Figure 16-18As shown, two sets of stop posts 3003 are provided at the end of the upper body, and the upper body locking post 3000 is placed between the two sets of stop posts. The height of the stop posts is greater than that of the upper body locking post, so that the locking key cannot move left or right during the sliding contact with the upper body locking post, but can only move back and forth, further improving the stability of locking and unlocking. The locking key 11 includes a horizontal part connected to the locking key push button 10, and an inclined arm 111 connecting the horizontal part to the latch end 110. The inclined arm allows the latch end to extend into the gap between the upper body and the lower body, reducing the volume of the upper body. At the same time, a locking hole 112 is provided on the horizontal part, and a connecting seat 101 is provided at the lower end of the locking key push button 10 corresponding to the locking hole, thereby realizing the synchronous movement of the locking key push button and the locking key. A stroke groove 51 is provided on the pressure cover 5 corresponding to the connecting seat. The distance that the connecting seat moves in the stroke groove is the distance that the locking key moves. The length of the stroke groove can be reasonably set as needed to reasonably adjust the opening distance between the upper body and the lower body. To facilitate the movement of the locking button, a pushing part 100 is provided on the locking button, which is shaped like a hill. A recessed part 50 is provided above the pressure cover, and the locking button is placed in the recessed part and slides within the recessed part. The lower end face 113 of the button is parallel to the button contact surface 52, which also facilitates the movement of the button.

[0046] Furthermore, such as Figure 9-11 As shown, the heating assembly 2 includes a heating bracket 20 and a heating surface 21 located at the lower end of the heating bracket. Heating elements 22 are provided on the heating surface and the heating bracket. The heating elements are connected to the control board to generate heat and transfer it to the heating surface, which then contacts the hair for straightening. Both ends of the heating bracket have protrusions 200, which detachably connect to the upper body 30 and lower body 31, facilitating the disassembly and installation of the heating assembly. The heating bracket 20 has locking blocks 201 on both sides. The heating surface 21 has corresponding hooks 211 on the locking blocks. The hooks pass through the locking blocks and contact the elastic ends 230 on both sides of the elastic element, connecting the heating surface 21 to the heating bracket. Both the locking blocks and the hooks have angled contact surfaces 2010, facilitating the insertion of the hooks into the gap between the two sets of locking blocks and locking them into the top of the locking blocks. The elastic element fixes the heating elements between the heating surface and the heating bracket, preventing them from shaking and causing poor contact. To improve heat transfer, multiple sets of through holes 210 are provided on the heating surface to enhance heat dissipation, but through holes are optional.

[0047] It should be understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A clamping device, comprising an upper handle and a lower handle, wherein one end of the upper handle and the lower handle are connected by a pivot, and the other end can be opened or closed relative to each other, characterized in that: A gap is provided between the end of the upper handle and the lower handle. A locking assembly is provided in the gap. The locking assembly includes a locking button and a locking key that moves with the locking button. The locking button drives the locking key into the gap, changing the opening angle of the other end of the upper and lower handles. A spring is also provided between the upper and lower handles. When the upper and lower handles move relative to each other and compress the spring, the spring returns to its original position, causing the clamping device to open.

2. The clamping device according to claim 1, characterized in that: The upper handle is provided with an upper body locking post at its end, and the lower handle is provided with a lower body locking post corresponding to the upper body locking post. A gap is left between the upper body locking post and the lower body locking post. The locking key includes a locking end that slides into the gap. The opening angle of the upper and lower handles is changed by the different positions of the locking end sliding into the gap. The lower end of the upper body locking post is provided with a slope, and the upper end of the locking end is provided with a corresponding slope.

3. The clamping device according to claim 2, characterized in that: The inclined surface at the lower end of the upper body locking pin is parallel to the inclined surface at the upper end of the buckle, the upper end of the lower body locking pin is parallel to the lower end of the buckle, and the upper end of the buckle is provided with a buckle. The upper body provides a thrust towards the pivot for the locking key through the buckle to prevent the locking key from moving backward. The locking assembly also includes a tail cover connected to the upper body. The tail cover is positioned between the locking key push button and the locking key, and the tail cover is provided with a travel groove. The locking key push button moves within the travel groove to limit the travel of the locking key. The lower end face of the locking key push button is parallel to the upper end face of the tail cover.

4. The clamping device according to claim 3, characterized in that: The upper body locking post is provided with stop posts on both sides. The height of the stop posts is greater than the height of the upper body locking post and generates a stopping force in the left and right direction of the locking end. The upper handle and the lower handle both include the body and a decorative piece on one side of the body. The decorative piece is connected to a plug. A face cover is provided on the other side of the body.

5. A hair straightener, comprising an upper handle and a lower handle arranged opposite to each other, wherein one end of the upper handle and the lower handle are connected by a pivot, and the other end of each handle is provided with a heating element that can be opened or closed relative to each other; a control board connected to the heating element and a button connected to the control board are provided in the upper handle or the lower handle; a connecting wire connected to the control board is provided on the upper handle or the lower handle, and the hair straightener is powered through the connecting wire to perform hair straightening operation, characterized in that: A gap is provided between the upper handle and the lower handle. A locking assembly is provided in the gap. The locking assembly includes a locking button and a locking key that moves with the locking button. The locking button drives the locking key into the gap, changing the opening angle of the other end of the upper and lower handles, thereby changing the distance between the two sets of heating components. A spring is also provided between the upper and lower handles. When the upper and lower handles move relative to each other, the heating components move closer to perform direct heating and compress the spring. After the spring returns to its original position, the clamping device opens and separates the two heating components.

6. The hair straightener according to claim 5, characterized in that: The heating assembly includes a heating bracket connected to the upper handle and the lower handle, a heating element disposed within the heating bracket, and a heating element in contact with the heating element. The heating element is electrically connected to the control board and is heated by the control board. The heating element transfers heat to the heating element, causing the heating element to heat up and then perform direct heating operation.

7. The hair straightener according to claim 6, characterized in that: The heating bracket has protrusions on both sides, which are detachably connected to the upper and lower handles. An elastic element is provided between the heating element and the heating bracket. The heating bracket includes two sets of oppositely arranged locking blocks. The heating element has two sets of hanging ears opposite the locking blocks. The hanging ears and the locking blocks have opposite oblique contact surfaces. The two sides of the hanging ears are provided with locking slots corresponding to the locking blocks. The elastic element has elastic ends at both ends corresponding to the hanging ears, which push the heating element to contact the heating element. A silicone pad is provided between the heating component and the upper handle, and a silicone pad is provided between the heating component and the lower handle.

8. The hair straightener according to claim 5, characterized in that: The upper handle is provided with an upper body locking post at its end, and the lower handle is provided with a lower body locking post corresponding to the upper body locking post. A gap is left between the upper body locking post and the lower body locking post. The locking key includes a locking end that slides into the gap. The opening angle of the upper and lower handles is changed by the different positions of the locking end sliding into the gap. The lower end of the upper body locking post is provided with a slope, and the upper end of the locking end is provided with a corresponding slope.

9. The hair straightener according to claim 8, characterized in that: The inclined surface at the lower end of the upper body locking pin is parallel to the inclined surface at the upper end of the buckle, the upper end of the lower body locking pin is parallel to the lower end of the buckle, and the upper end of the buckle is provided with a buckle. The upper body provides a thrust towards the pivot for the locking key through the buckle to prevent the locking key from moving backward. The lower body locking pin is located in the middle of the lower body, and the other end of the lower body is connected to a tail cover. The connecting wire includes a female end located between the tail cover and the lower body, and a male end inserted into the female end. The male end is connected to a plug. The locking assembly also includes a tail cover connected to the upper body. The tail cover is located between the locking key push button and the locking key, and the tail cover is provided with a travel groove. The locking key push button moves within the travel groove to limit the travel of the locking key. The lower end face of the locking key push button is parallel to the upper end face of the tail cover. The locking key is located between the tail cover and the pressure cover.

10. The hair straightener according to claim 9, characterized in that: The upper body locking post is provided with stop posts on both sides. The height of the stop posts is greater than the height of the upper body locking post, and they generate a stopping force in the left and right directions of the locking end. The upper handle and the lower handle both include a body and a decorative piece on one side of the body. A plug is connected to the decorative piece. A face cover is provided on the other side of the body. The plug has a striped groove, and the decorative piece has a recess in the middle. The plug is detachably connected to the decorative piece in the recess.

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