Double-structure hair curler capable of freely adjusting up and down

Abstract

The utility model relates to hairdressing apparatus technical field especially, it is a kind of egg roll type hairdressing apparatus to realize double structure up and down free adjustment, including two bodies of being connected and can open and close, heating structure is respectively arranged on the opposite face of two bodies, and two heating structures are along the central symmetry structure of the middle axis between two bodies;Heating structure includes fixed heating element fixed on body and movable heating element movably connected on body, when two bodies close, the fixed heating element and movable heating element on two bodies are mutually interlaced and form the curly hair space with wavy cross section;This independent adjustment design lets the fluctuation amplitude of wavy curly hair space no longer be bound by symmetry structure, can form one side gentle, one side full asymmetric wave curl, also can accurately adjust the fluffiness and bending radian of partial curly hair according to demand, can realize from single symmetry modeling upgrade to multidimensional customization modeling.

Description

Technical Field

[0001] This utility model relates to the field of hair styling tools, and in particular to an egg roll type hair styling tool that allows for free vertical adjustment of the dual structure. Background Technology

[0002] In the modern beauty and hairdressing industry, curling irons are the core tools for achieving diverse hairstyles. Their functions and performance are closely related to users' needs for personalized hairstyles. Among them, the egg roll curling iron, which can achieve specific curly shapes, has been widely used in both home hairdressing scenarios and professional hair salons due to its unique styling effect.

[0003] The core working principle of an egg roll hair styling tool is that after bending the hair, the built-in heating element heats the bent hair. Once the hair cools naturally, the curl is set, allowing users to quickly create a hairstyle with egg roll characteristics. To meet users' needs for different curl sizes, existing egg roll hair styling tools typically adjust the distance between the heating plates to change the height difference of the curls, thus achieving different curl shapes and setting effects.

[0004] Specifically, in existing technologies, most egg-roll hair styling tools use a gear-driven transmission method to move or raise the heating element (i.e., heating plate). This transmission method has the advantages of simple structure, stable and reliable transmission process, and easy control precision. By controlling the rotation amplitude of the gears, the heating element can move or rise to different degrees, thereby changing the distance between the heating plates. When the distance between the heating plates changes, the bending radius formed by the hair during the heating and styling process changes accordingly, ultimately achieving various sizes and shapes of curls, thus improving the applicability of the hair styling tool to a certain extent.

[0005] However, as consumers' demands for personalized and diverse hairstyles continue to rise, the functional limitations of existing egg-roll hair styling tools are becoming increasingly apparent. Current technology can only change the winding size by adjusting the spacing between the heating plates, and cannot provide a wider range of adjustments to the winding shape. For example, it cannot achieve different winding shapes with varying wave curves, resulting in a limited range of hairstyles that cannot meet consumers' expectations for different occasions and styles. This restricts the further promotion and application of egg-roll hair styling tools in the market. Therefore, how to overcome the current technological bottlenecks and achieve richer adjustments to the winding shape has become a key issue that urgently needs to be addressed in the research and development of egg-roll hair styling tools. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the above problems.

[0007] A hair curler with adjustable vertical structure includes two connected and closable bodies. Heating structures are provided on opposite surfaces of the two bodies, and the two heating structures are centrally symmetrical along the central axis between the two bodies. The heating structure includes a fixed heating element fixed to the body and a movable heating element movably connected to the body. When the two bodies are closed, the fixed heating elements and the movable heating elements on the two bodies intersect to form a curling space with a wave-shaped cross section, and the two movable heating elements are located between the two fixed heating elements. The main body is also connected to a gear-type adjustment knob, which is connected to a movable heating element. The movable heating element can be adjusted in height by the gear-type adjustment knob, thereby adjusting the range of the curling space.

[0008] Preferably, the gear-type adjustment knob includes a fixed sleeve fixed to the main body, a rotating sleeve rotatably connected to the outside of the fixed sleeve, and a connector movably sleeved inside the fixed sleeve. The connector is fixedly connected to the movable heating element. A protrusion is formed on the outside of the connector, which protrudes through the fixed sleeve. A spiral groove is formed on the inside of the rotating sleeve that engages with the protrusion. Rotating the rotating sleeve causes the protrusion to slide along the spiral groove to adjust the height of the movable heating element. An elastic snap-fit ​​structure is also provided between the rotating sleeve and the fixed sleeve, allowing for snap-fit ​​engagement at multiple rotation angles.

[0009] Preferably, the fixing sleeve has a bottom fixed to the body, a sleeve-shaped part formed on the bottom, and a fixing cover snapped onto the sleeve-shaped part. After the rotating sleeve is fitted onto the sleeve-shaped part, it is constrained between the bottom and the fixing cover by the fixing cover. The sleeve-shaped part also has a notch, and the protrusion protrudes through the fixing sleeve along the notch.

[0010] Preferably, the elastic snap-fit ​​structure includes multiple snap-fit ​​grooves formed on the inner side of the rotating sleeve, a receiving groove formed on the fixed sleeve, a snap-fit ​​member guided and connected in the receiving groove, and a spring elastically abutting between the snap-fit ​​member and the receiving groove, wherein the snap-fit ​​member is provided with a protrusion that mates with the snap-fit ​​groove.

[0011] Preferably, both the fixed heating element and the movable heating element include a hollow heat-conducting profile and a heating module disposed within the heat-conducting profile. The heat-conducting profile has a long strip structure and an arc-shaped surface. The heating module acts on the arc-shaped surface. When the two bodies are closed, the arc-shaped surfaces intersect to form a wavy curling space. The heat-conducting profile of the fixed heating element is fixed to the body, and the heat-conducting profile of the movable heating element is guided and matched with the body. The heat-conducting profile of the movable heating element is also fixedly connected to the connector.

[0012] Preferably, the heat-conducting profile of the fixed heating element is fixed at one edge of the body, and the heat-conducting profile of the fixed heating element transitions to one side of the body through an arc-shaped surface.

[0013] Preferably, the cross-section of the heat-conducting profile of the movable heating element has an integrally combined square part and a semi-circular part, with an arc-shaped surface formed on the semi-circular part, and the side of the square part away from the semi-circular part is fixedly connected to the connector; the heating module is disposed inside the semi-circular part.

[0014] Preferably, a hair-adhesive layer is laminated to the outer surface of the thermally conductive profile.

[0015] Preferably, the main body has a rear gripping part and a front hair clipping part, and an elastic hinge structure is provided between the gripping parts of the two main bodies so that the two main bodies form an opening and closing structure that can be automatically opened; the gripping part is also provided with a circuit module, and a fixed heating element and a movable heating element are electrically connected to the circuit module; the hair clipping part is provided with a guide groove and an opening located next to the guide groove; a part of the movable heating element slides and is guided by the guide groove, and a gear-type adjustment knob is connected to the movable heating element through the guide groove; the other part of the movable heating element extends out of the guide groove and docks with the opening structure of the other main body.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This hair styling tool features two independent adjustable knobs for each of its two movable heating elements, allowing for different levels of height adjustment and breaking the central symmetry between them about the body's central axis. This independent adjustment design frees the undulation of the wavy curl space from the constraints of the symmetrical structure, enabling the creation of asymmetrical wavy curls with one side flat and the other full. It also allows for precise adjustment of the volume and curvature of local curls according to needs, enabling the upgrade from a single symmetrical style to a multi-dimensional customized style, thus solving the core pain point of existing egg roll hair styling tools that offer only one type of style.

[0017] With its independent adjustment knobs, users can flexibly adjust the height of the two movable heating elements according to their hairstyle preferences, hair texture, or specific style needs. This eliminates the need for a fixed symmetrical pattern; individual adjustments allow for easy creation of differentiated curls, fully satisfying consumers' pursuit of personalized hairstyles. The independent adjustment knobs offer clear operational logic, allowing users to precisely control the adjustment range of each individual movable heating element by turning the two knobs separately. This eliminates the need for complex operations, making it easy to set personalized styling parameters and lowering the barrier to entry. Even when the two movable heating elements are asymmetrical, the staggered arrangement of the fixed and movable heating elements ensures a stable curling space after closure, preventing hair from shifting after embedding. Combined with the even heating of the heating structure, this achieves both asymmetrical personalized styling and ensures even and long-lasting curl retention for each section of hair, balancing styling creativity with practicality.

[0018] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, 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.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model in its closed state; Figure 2 This is a schematic diagram of the structure of this utility model in its open state; Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention in its closed state; Figure 4 This is a structural schematic diagram of one of the main bodies of this utility model, along with a fixed heating element and a movable heating element; Figure 5 This is a utility model Figure 4 A structural diagram showing the disassembled movable heating element; Figure 6 This is a schematic diagram of the structure of the gear-type adjustment knob of this utility model; Figure 7 This is a schematic diagram of the split structure of the gear-type adjustment knob of this utility model from one perspective; Figure 8 This is a schematic diagram of the disassembled structure of the gear-type adjustment knob from another perspective.

[0021] The reference numerals and names in the figure are as follows: Body 10, gripping part 11, hair clipping part 12, elastic hinge structure 13, circuit module 14, guide groove 15, window 16, fixed heating element 20, movable heating element 30, gear adjustment knob 40, fixing sleeve 41, bottom 411, sleeve-shaped part 412, fixing cover 413, notch 414, rotating sleeve 42, connector 43, protrusion 44, spiral groove 45, elastic snap-fit ​​structure 46, slot 461, receiving groove 462, snap-fit ​​part 463, spring 464, convex bulge 465, heat-conducting profile 50, heating module 51, square part 53, semi-circular part 54, hair-adhesive layer 55. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. 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.

[0023] Please see Figure 1-8 In this embodiment of the present invention, an egg-shaped hair styling tool with dual-structure vertically adjustable features includes two connected and closable bodies 10. Heating structures are respectively provided on the opposite surfaces of the two bodies 10, and the two heating structures are centrally symmetrical along the central axis between the two bodies 10. The heating structure includes a fixed heating element 20 fixed on the body 10 and a movable heating element 30 movably connected to the body. When the two bodies 10 are closed, the fixed heating element 20 and the movable heating element 30 on the two bodies 10 intersect to form a curling space with a wavy cross section, and the two movable heating elements 30 are located between the two fixed heating elements 20. A gear-type adjustment knob 40 is also connected to the main body 10. The gear-type adjustment knob 40 is connected to the movable heating element 30, so that the height of the movable heating element 30 can be adjusted by the gear-type adjustment knob 40, thereby adjusting the range of the curling space.

[0024] In use, first keep both openable bodies 10 in the open state. The user rotates the gear adjustment knob 40 on the body 10 according to the desired wave amplitude. Since the gear adjustment knob 40 is connected to the movable heating element 30, the rotation of the gear adjustment knob 40 will directly drive the movable heating element 30 to adjust its height, thereby changing the undulation amplitude of the wave-shaped curl space that will be formed when closed. After the amplitude is adjusted to the appropriate position, place the hair to be styled on the heating structure of one of the bodies 10. Then close the two bodies 10 relative to each other. At this time, the fixed heating element 20 and the movable heating element 30 on the opposite surfaces of the two bodies 10 will be intertwined due to the central symmetrical layout, forming a wave-shaped curl space with a preset cross-section. The movable heating element 30 is always between the two fixed heating elements 20, ensuring that the hair is stably limited within the wave-shaped area. Finally, the heating structure starts to heat up and heat and shape the hair embedded in the curl space, ultimately forming a wave-shaped egg roll hairstyle that matches the adjusted amplitude.

[0025] Therefore, through the above-mentioned technical means, unlike the fixed and symmetrical design of the heating structure in the existing technology, this hair styling tool is equipped with independent level adjustment knobs 40 for each of the two movable heating elements 30, which supports different degrees of height adjustment of the two movable heating elements 30, and can break the central symmetry between the two about the central axis of the body 10; this independent adjustment design makes the undulation of the wavy curl space no longer restricted by the symmetrical structure, which can not only form asymmetrical wavy curls with one side flat and the other side full, but also precisely adjust the fluffiness and curvature of the local curls according to the needs, and realize the upgrade from a single symmetrical style to a multi-dimensional customized style, solving the core pain point of the existing egg roll hair styling tool with a single style.

[0026] With its independent adjustment knobs, the system allows users to flexibly adjust the height of the two movable heating elements 30 according to their hairstyle preferences, hair texture, or specific style needs. This eliminates the need for a fixed symmetrical pattern; individual adjustments easily achieve differentiated curling effects, fully satisfying consumers' pursuit of personalized hairstyles. Furthermore, the independent adjustment knobs 40 offer clear operational logic. Users can precisely control the adjustment range of each movable heating element 30 by turning the two knobs separately, enabling personalized styling parameter settings without complex operations, thus lowering the barrier to entry. Even when the two movable heating elements 30 are in an asymmetrical state, the staggered arrangement of the fixed heating element 20 and the movable heating element 30 ensures a stable curling space after closure. The embedded hair is less prone to shifting, and the uniform heating of the structure allows for both asymmetrical personalized styling and ensures even and long-lasting curl setting for each section of hair, balancing styling creativity with practicality.

[0027] Please see Figure 6-8Based on the above technical solution, the gear adjustment knob 40 has been further defined, as follows: The gear-type adjustment knob 40 includes a fixed sleeve 41 fixed to the body 10, a rotating sleeve 42 rotatably connected to the outside of the fixed sleeve 41, and a connector 43 movably sleeved inside the fixed sleeve 41. The connector 43 is fixedly connected to the movable heating element 30. A protrusion 44 is formed on the outside of the connector 43, which protrudes through the fixed sleeve 41. A spiral groove 45 is formed on the inside of the rotating sleeve 42, which engages with the protrusion 44. Rotating the rotating sleeve 42 causes the protrusion 44 to slide along the spiral groove 45 to adjust the height of the movable heating element 30. An elastic snap-fit ​​structure 46 is also provided between the rotating sleeve 42 and the fixed sleeve 41. The rotating sleeve 42 and the fixed sleeve 41 are engaged at multiple rotation angles through the elastic snap-fit ​​structure 46. The height adjustment is achieved by the cooperation of the fixed sleeve 41, the rotating sleeve 42 and the connector 43, with the inner spiral groove 45 of the rotating sleeve 42 driving the protrusion 44 of the connector 43 to slide. This mechanical transmission structure has a fixed transmission ratio, which can accurately convert the rotation of the rotating sleeve 42 into the linear lifting and lowering of the connector 43. In addition, the elastic snap-fit ​​structure 46 is used to achieve the snap-fit ​​of the rotation angle, which makes the height adjustment of the movable heating element 30 more controllable, avoids the adjustment deviation that may occur in the traditional adjustment method, and ensures that the user can accurately set the required curling space.

[0028] The fixing sleeve 41 has a bottom 411 fixed to the body 10, a sleeve-shaped part 412 formed on the bottom 411, and a fixing cover 413 snapped onto the sleeve-shaped part 412. After the rotating sleeve 42 is fitted onto the sleeve-shaped part 412, it is constrained between the bottom 411 and the fixing cover 413 by the fixing cover 413. The sleeve-shaped part 412 is also provided with a notch 414, and the protrusion 44 protrudes from the fixing sleeve 41 along the notch 414. The fixed sleeve 41, through the combination structure of the bottom 411, the sleeve-shaped part 412 and the fixed cover 413, stably constrains the rotating sleeve 42 between the bottom 411 and the fixed cover 413. This not only prevents the rotating sleeve 42 from shifting axially during adjustment, but also ensures the compactness of the overall knob structure, preventing loose parts from affecting the adjustment effect. The notch 414 on the sleeve-shaped part 412 of the fixed sleeve 41 provides a stable sliding guide for the protrusion 44 of the connecting part 43, ensuring that the protrusion 44 only moves up and down along the direction of the notch 414, preventing the connecting part 43 from shifting radially during movement. It also limits the sliding stroke of the protrusion 44, preventing over-adjustment from causing the movable heating element 30 to collide with other parts, thus extending the product's service life.

[0029] The elastic snap-fit ​​structure 46 includes a plurality of snap-fit ​​grooves 461 formed on the inner side of the rotating sleeve 42, a receiving groove 462 formed on the fixed sleeve 41, a snap-fit ​​member 463 guided and connected in the receiving groove 462, and a spring 464 elastically abutting between the snap-fit ​​member 463 and the receiving groove 462. The snap-fit ​​member 463 is provided with a protrusion 465 that abuts against the snap-fit ​​groove 461. Through the cooperation of multiple slots 461 on the inner side of the rotating sleeve 42, the snap-fit ​​piece 463 in the fixed sleeve 41, and the spring 464, during rotation adjustment, the protrusion 465 on the snap-fit ​​piece 463 will sequentially snap into different slots 461 as the rotating sleeve 42 rotates. This not only provides users with a clear "gear feedback" so that users can judge whether the adjustment gear is in place by touch without relying on visual observation, thus improving the convenience of operation, but also ensures that the protrusion 465 and the slot 461 are stably engaged by the elastic abutment of the snap-fit ​​piece 463 by the spring 464. This prevents the rotating sleeve 42 from rotating on its own due to external forces such as vibration after adjustment, thereby maintaining the stability of the height of the movable heating element 30 and ensuring that the curling space does not change during the styling process, further improving the reliability of the styling effect.

[0030] Therefore, the entire knob structure adopts a modular design. The fixed sleeve 41, rotating sleeve 42, connecting piece 43 and elastic snap-fit ​​component can all be processed and assembled independently. This not only reduces the difficulty of production and manufacturing, but also facilitates later maintenance and component replacement. Furthermore, the standardized structural design ensures consistency during mass production and improves product quality stability.

[0031] Please see Figure 1-5 Based on the above technical solution, the fixed heating element 20 and the movable heating element 30 are further defined as follows: Both the fixed heating element 20 and the movable heating element 30 include a hollow heat-conducting profile 50 and a heating module 51 disposed within the heat-conducting profile 50. The heat-conducting profile 50 has a long strip structure and an arc-shaped surface. The heating module 51 acts on the arc-shaped surface. When the two bodies 10 are closed, the arc-shaped surfaces intersect to form a wavy curling space. The heat-conducting profile 50 of the fixed heating element 20 is fixed to the body 10, and the heat-conducting profile 50 of the movable heating element 30 is guided and matched with the body 10. The heat-conducting profile 50 of the movable heating element 30 is fixedly connected to the connector 43. The heating module 51 acts directly on the arc-shaped surface of the heat-conducting profile 50. The hollow structure not only reduces the overall weight of the heating element, but also allows the heat from the heating module 51 to be transferred to the arc-shaped surface more concentratedly, avoiding excessive heat loss during conduction. At the same time, the long strip-shaped heat-conducting profile 50, combined with the arc-shaped surface design, allows the arc-shaped surfaces to intersect and form a wavy curling space when the two main bodies 10 are closed. The contact area between the hair and the arc-shaped surface is more uniform, and the heat can evenly cover each section of hair, effectively avoiding the problem of local overheating or insufficient heating. This ensures a more lasting and natural curling effect, solving the problem of poor styling effect caused by uneven heat distribution in traditional heating elements.

[0032] The heat-conducting profile 50 of the fixed heating element 20 is fixed at one side edge of the body 10, and the heat-conducting profile 50 of the fixed heating element 20 transitions to one side of the body 10 through an arc surface; this layout not only makes the connection between the heating element and the body 10 more secure, avoiding loosening due to vibration during use, but the arc transition design can also reduce the friction between hair and the edge of the body 10, preventing hair from being snagged and damaged.

[0033] The heat-conducting profile 50 of the movable heating element 30 has an integrally combined square portion 53 and a semi-circular portion 54 in its cross-section. The arc surface is formed on the semi-circular portion 54. The side of the square portion 53 away from the semi-circular portion 54 is fixedly connected to the connector 43. The heating module 51 is set inside the semi-circular portion 54 to ensure the accuracy of heat transfer. The square portion 53 is used to fix the connection with the connector 43. The square structure can provide a more stable connection surface and prevent the movable heating element 30 from shifting or shaking when it is raised and lowered with the connector 43. At the same time, the guide cooperation between the movable heating element 30 and the body 10 further constrains its movement trajectory, ensuring a smoother height adjustment process and ensuring the accuracy of the curling space amplitude adjustment.

[0034] A hair-absorbing layer 55 is bonded to the outer surface of the thermally conductive profile 50, which improves the safety and comfort of the user.

[0035] Please see Figure 2-5 Based on the above technical solution, the main body 10 is further defined as follows: The main body 10 has a rear grip portion 11 and a front hair clipping portion 12. An elastic hinge structure 13 is provided between the grip portions 11 of the two main bodies 10, allowing the two main bodies 10 to form an automatically opening and closing structure. The partitioned design of the rear grip portion 11 and the front hair clipping portion 12 allows the user to naturally grip the grip portion 11 during use, separating the hand from the heated front hair clipping portion 12, effectively preventing accidental contact with the high-temperature area and resulting burns. Simultaneously, the ergonomic grip portion 11 design reduces hand fatigue during prolonged use. The elastic hinge structure 13 between the main body 10 and the gripping part 11 allows the main body 10 to form an automatically opening and closing structure. Users only need to press the gripping part 11 to close the hair clamping part 12 to fix the hair. After releasing, the hair clamping part 12 will automatically pop open, eliminating the need for manual prying and simplifying the process of picking up and putting down hair. It is especially suitable for one-handed operation. The gripping part 11 is also equipped with a circuit module 14. The fixed heating element 20 and the movable heating element 30 are electrically connected to the circuit module 14, which not only achieves a reasonable layout of functional components but also ensures safety and structural stability. The hair clip 12 is provided with a guide groove 15 and an opening 16 located beside the guide groove 15; a part of the movable heating element 30 is guided and slidably engaged with the guide groove 15, and the gear adjustment knob 40 is connected to the movable heating element 30 through the guide groove 15. The other part of the movable heating element 30 extends out of the guide groove 15 and docks with the opening 16 structure of the other body 10; a part of the movable heating element 30 is guided and slidably engaged with the guide groove 15, and the guide groove 15 can constrain the movement trajectory of the movable heating element 30, ensuring that it only moves when raised and lowered with the gear adjustment knob 40. Moving along a preset direction avoids lateral deviation or swaying, ensuring the precision of the curling space adjustment. The other part of the movable heating element 30 extends out of the guide groove 15 and connects with the window 16 of the other body 10. The window 16 not only provides sufficient space for the movable heating element 30 to move, avoiding interference with the body 10 during adjustment, but also helps to position the movable heating element 30 when the hair clamping part 12 is closed, ensuring that the heating elements on the two bodies 10 can accurately intersect to form a wave-like curling space, further improving the stability and consistency of the styling effect.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A dual-structure, vertically adjustable egg-roll hair styling tool, characterized in that, The device includes two connected and closable bodies (10), with heating structures provided on opposite surfaces of the two bodies (10), and the two heating structures are centrally symmetrical along the central axis between the two bodies (10). The heating structure includes a fixed heating element (20) fixed on the body (10) and a movable heating element (30) movably connected to the body (10). When the two bodies (10) are closed, the fixed heating element (20) and the movable heating element (30) on the two bodies (10) intersect to form a wavy hair curling space, and the two movable heating elements (30) are located between the two fixed heating elements (20). A gear-type adjustment knob (40) is also connected to the main body (10). The gear-type adjustment knob (40) is connected to the movable heating element (30) so that the movable heating element (30) can adjust its height through the gear-type adjustment knob (40), thereby adjusting the range of the curling space.

2. The egg-shaped hair styling tool with dual-structure vertically adjustable design according to claim 1, characterized in that, The gear-type adjustment knob (40) includes a fixed sleeve (41) fixed on the body (10), a rotating sleeve (42) rotatably connected to the outside of the fixed sleeve (41), and a connector (43) movably sleeved inside the fixed sleeve (41). The connector (43) is fixedly connected to the movable heating element (30). A protrusion (44) is formed on the outside of the connector (43). The protrusion (44) protrudes through the fixed sleeve (41). A spiral groove (45) is opened on the inside of the rotating sleeve (42) and engages with the protrusion (44). The rotating sleeve (42) is rotated so that the protrusion (44) slides along the spiral groove (45) to adjust the height of the movable heating element (30). An elastic snap-fit ​​structure (46) is also provided between the rotating sleeve (42) and the fixed sleeve (41), and the rotating sleeve (42) and the fixed sleeve (41) are engaged in multiple rotation angles through the elastic snap-fit ​​structure (46).

3. The egg-shaped hair styling tool with dual-structure vertically adjustable design according to claim 2, characterized in that, The fixing sleeve (41) has a bottom (411) fixed on the body (10), a sleeve-shaped part (412) formed on the bottom (411), and a fixing cover (413) snapped on the sleeve-shaped part (412). After the rotating sleeve (42) is fitted onto the sleeve-shaped part (412), it is constrained between the bottom (411) and the fixing cover (413) by the fixing cover (413). The sleeve-shaped part (412) also has a notch (414), and the protrusion (44) protrudes through the fixing sleeve (41) along the notch (414).

4. A hair styling tool with a dual-structure, freely adjustable up-and-down design according to any one of claims 2-3, characterized in that, The elastic snap-fit ​​structure (46) includes multiple slots (461) formed inside the rotating sleeve (42), a receiving groove (462) formed on the fixed sleeve (41), a snap-fit ​​member (463) connected in the receiving groove (462) and a spring (464) elastically abutting between the snap-fit ​​member (463) and the receiving groove (462). The snap-fit ​​member (463) is provided with a protrusion (465) that abuts against the slot (461).

5. The egg-shaped hair styling tool with dual-structure vertically adjustable design according to claim 2, characterized in that, Both the fixed heating element (20) and the movable heating element (30) include a hollow heat-conducting profile (50) and a heating module (51) disposed in the heat-conducting profile (50). The heat-conducting profile (50) has a long strip structure and an arc surface. The heating module (51) acts on the arc surface. When the two bodies (10) are closed, the arc surfaces intersect to form a wavy hair curling space. The heat-conducting profile (50) of the fixed heating element (20) is fixed on the body (10), and the heat-conducting profile (50) of the movable heating element (30) is guided and matched with the body (10). The heat-conducting profile (50) of the movable heating element (30) is fixedly connected to the connector (43).

6. The egg-shaped hair styling tool with dual-structure vertically adjustable design according to claim 5, characterized in that, The heat-conducting profile (50) of the fixed heating element (20) is fixed at one side edge of the body (10), and the heat-conducting profile (50) of the fixed heating element (20) transitions to one side of the body (10) through an arc surface.

7. The egg-roll hair styling tool with dual-structure vertically adjustable design according to claim 5, characterized in that, The heat-conducting profile (50) of the movable heating element (30) has an integrally combined square part (53) and a semi-circular part (54) with an arc-shaped surface formed on the semi-circular part (54). The side of the square part (53) away from the semi-circular part (54) is fixedly connected to the connector (43); the heating module (51) is disposed inside the semi-circular part (54).

8. The egg-shaped hair styling tool with dual-structure vertically adjustable design according to claim 5, characterized in that, A hair-adhesive layer (55) is bonded to the outer surface of the thermally conductive profile (50).

9. A hair styling tool with a dual-structure, freely adjustable up-and-down design according to any one of claims 1, 5, 6, 7, or 8, characterized in that, The main body (10) has a rear gripping part (11) and a front hair clipping part (12). An elastic hinge structure (13) is provided between the gripping parts (11) of the two main bodies (10) so that the two main bodies (10) can form an opening and closing structure that can be opened automatically. The gripping part (11) is also provided with a circuit module (14). The fixed heating element (20) and the movable heating element (30) are electrically connected to the circuit module (14). The hair clipping part (12) is provided with a guide groove (15) and an opening (16) located next to the guide groove (15). A part of the movable heating element (30) slides and is guided by the guide groove (15). The gear adjustment knob (40) is connected to the movable heating element (30) through the guide groove (15). The other part of the movable heating element (30) extends out of the guide groove (15) and docks with the opening (16) structure of the other main body (10).

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