Ratchet curler

Abstract

This invention relates to a toothed hair curler, belonging to the field of electrical appliances. A toothed hair curler includes: a handle assembly; a toothed assembly, with at least two toothed assemblies, the at least two toothed assemblies being rotatable relative to the handle assembly and meshing with each other when rotating relative to the handle assembly, the meshing area of ​​adjacent toothed assemblies being used for curling hair; a heating assembly, the heating assembly being disposed on the toothed assemblies and / or the handle assembly, the heating assembly being used to heat the toothed assemblies; and a control assembly, the control assembly being disposed on the handle assembly and electrically connected to the heating assembly. This device uses the handle assembly as the overall supporting base, making it convenient to operate and hold. Two or more sets of toothed assemblies can rotate relative to the handle assembly and mesh with each other, the meshing area of ​​adjacent toothed assemblies serving as the curling station, changing the traditional single-sided pressing operation of a straightener.

Description

Technical Field

[0001] This invention relates to the field of electrical appliances, and in particular to a toothed hair curler. Background Technology

[0002] Traditional hair curling tools often use a straightener clamp to hold and heat the hair, relying on a single plane to create curls. This type of structure not only has a limited heating area and uneven force, which can easily lead to insufficient curl, stiff texture, poor hold and low durability, but also makes it difficult to use and can easily damage the hair. Summary of the Invention

[0003] Therefore, it is necessary to provide a toothed hair curler to address the problem of unreasonable structural design of hair curlers.

[0004] A toothed hair curler includes: a handle assembly; a toothed assembly, the number of which is at least two, the at least two toothed assemblies being rotatable relative to the handle assembly and meshing with each other when rotating relative to the handle assembly, the meshing points of adjacent toothed assemblies being used for curling hair; a heating assembly disposed on the toothed assemblies and / or the handle assembly, the heating assembly being used to heat the toothed assemblies; and a control assembly disposed on the handle assembly and electrically connected to the heating assembly.

[0005] The above-disclosed toothed curling iron addresses the shortcomings of traditional straighteners, such as uneven heating, stiff styling, and easy damage to hair. This toothed curling iron features a rational structural design, significantly improving overall performance and user experience. The device uses a handle assembly as the overall supporting structure, making it easy to hold and operate. Two or more sets of toothed rollers can rotate relative to the handle assembly and mesh with each other. The meshing area of ​​adjacent rollers serves as the curling station, changing the traditional single-sided squeezing operation of straighteners. After the hair is placed in the meshing position, the synchronous rotation of the rollers completes the curling action, resulting in even and gentle force on the hair strands, effectively avoiding pulling and pinching damage. Heating components are arranged on the roller and handle assemblies, providing comprehensive heating. Compared to the limited heating area of ​​traditional straighteners, this structure allows for full contact between the hair strands and the heating element, resulting in more even and comprehensive heating, stable temperature rise, and high heat utilization. This produces natural and smooth curl textures, full curls, and significantly improved styling effect and durability. The control components are integrated into the handle assembly and electrically connected to the heating element, allowing users to easily control the start / stop and temperature settings. The overall structure features strong linkage, smooth gear meshing rotation, and a balance of safety, design versatility, and ease of operation.

[0006] In one embodiment, the toothed roller assembly is detachably mounted on the handle assembly and / or the heating assembly. This detachable structure allows users to quickly disassemble and replace different sizes of toothed roller assemblies to create curls of varying sizes (large, medium, small), easily achieving diverse and personalized hairstyles without the need to purchase multiple curling irons of different models, significantly reducing operating costs. Furthermore, the detached components result in a smaller overall size, making storage and portability more convenient, suitable for various usage scenarios such as home and travel. The toothed roller assembly is easy to assemble and disassemble, and after assembly, it can still precisely engage with other components, maintaining normal meshing, rotation, and heat conduction performance, ensuring stable and non-slip operation.

[0007] In one embodiment, the heating element is disposed on the handle assembly, and the toothed roller assembly is rotatably disposed on the handle assembly, with at least a portion of the heating element extending into the handle assembly. The embedded design of the heating element forms a protective structure within the handle housing, effectively isolating it from external impacts and dust intrusion, reducing the probability of damage to the heating component, extending its service life, and preventing the heating structure from being exposed, thus reducing the risk of accidental burns and improving user safety. The heat generated by the heating element can be evenly conducted to the outer toothed roller assembly through the housing, resulting in a short heat transfer path, less loss, and higher heating efficiency. This allows the toothed roller assembly to heat up quickly and evenly, ensuring the curling and styling effect.

[0008] In one embodiment, the heating element is disposed on the toothed roller assembly, which is rotatably mounted on the handle assembly. By placing the heating element on the toothed roller assembly, heat can be directly applied to it, significantly shortening the conduction path, resulting in low heat loss, rapid heating, and uniform heating throughout the toothed roller assembly. When hair contacts and wraps around the toothed roller assembly, synchronous heating is achieved, ensuring sufficient and consistent heating, effectively improving the efficiency and durability of curl styling, and creating a natural-textured curly hairstyle.

[0009] In one embodiment, the heating element is disposed on the handle assembly, and the toothed roller assembly is rotatably disposed on the handle assembly. The toothed roller assembly has an adapter channel, and the heating element is at least partially located within the adapter channel. By embedding the heating element into the adapter channel, the two fit together with a gap, which does not hinder the flexible rotation of the toothed roller assembly, but also significantly shortens the heat transfer distance, reduces heat loss, and improves heat conduction efficiency, allowing the toothed roller assembly to heat up quickly and evenly. During operation, the toothed roller assembly can rotate around the heating element or rotate synchronously with the heating element, ensuring even heating throughout its body. When in contact with the hair, the temperature is stable, which can effectively improve the curl setting effect and durability.

[0010] In one embodiment, the handle assembly includes a first handle, a second handle, a movable member, and a spring. The second handle is disposed on the first handle, and the first handle is rotatable relative to the second handle, and / or the second handle is rotatable relative to the first handle. The movable member is disposed on the first and second handles and is reciprocating relative to the first and second handles. The spring is clamped between the first and second handles. At least two gear assemblies are disposed on the first and second handles. The heating component is disposed on the first handle and / or the second handle and / or the gear assemblies. The control component is disposed on the first handle or the second handle. The first handle serves as a basic support component, firmly supporting the second handle and other functional components. The second and first handles can rotate, and with the spring clamped between them, the handles can be opened and closed elastically, allowing the user to easily control the clamping force. In use, the user pushes the movable member to reciprocate relative to the first and second handles, thus retracting or unfolding the first and second handles, facilitating flexible use of the toothed hair curler. The spring provides uniform rebound force, ensuring smooth opening and closing of the handle and precise return to its original position, preventing jamming and reducing user fatigue. The moving parts further enhance the stability and smoothness of the handle's opening and closing, preventing loosening or shifting during operation. The heating element is located on the first handle and / or the second handle and / or the roller assembly. When engaged with the roller assembly during curling, it provides even heating to the hair from all directions, improving styling results. The control component is located on the first or second handle, allowing for convenient adjustment of the heating element's heating status, making operation intuitive and effortless.

[0011] In one embodiment, when the movable member reciprocates relative to the first handle and the second handle, the movable member has at least a first position and a second position relative to the first handle and / or the second handle. When the movable member is in the first position, the second handle and the first handle are close to each other, and the spring is compressed. When the movable member is in the second position, the second handle and the first handle are far apart, and the spring is extended. Using the first handle as a basic load-bearing component, the second handle and other functional components are stably supported. When the movable member reciprocates relative to the first and second handles, it can drive the switching of the states of the first and second handles. The extension and contraction of the springs enable precise opening and closing of the handles. The first position is the stored state of the toothed hair curler, and the second position is the used state of the toothed hair curler. When the movable member is in the first position, the first handle and the second handle are close to each other, and the spring is compressed. At this time, the spacing between the toothed components is reduced, resulting in a compact overall size, easy storage, and space saving. When the movable member is in the second position, the first handle and the second handle are far apart, the spring is extended, and the spacing between the toothed components is increased, making it easier to insert hair and convenient to operate. The extension and contraction of the spring provides a uniform rebound force, making the handle switch positions smoothly and accurately, while the moving parts ensure the stability of the position switching and prevent deviation.

[0012] In one embodiment, the movable component includes a movable component body, a first guide member, and a second guide member. The first handle has a guide rib. Both the first and second guide members are disposed on the movable component body. The movable component body is disposed on the first and second handles and can reciprocate relative to the first and second handles. The first guide member cooperates with the guide rib, and the second guide member abuts against the second handle. The movable component body, positioned between the first and second handles, provides basic support for the reciprocating motion. The precise cooperation between the first and guide ribs restricts the movement trajectory of the movable component, preventing deviation or jamming during reciprocating motion and ensuring precise and controllable movement. The second guide member abuts against the second handle, acting as a limit during reset and further preventing deviation during handle reset, ensuring accurate position switching. When stored, the second handle and first handle are close together, with the spring compressed, resulting in a compact and space-saving overall size. When in use, the second handle and first handle are far apart, with the spring extended, increasing the spacing of the gear assembly for easier operation.

[0013] In one embodiment, the heating component includes a mounting housing and a heating body. The mounting housing is disposed on the handle assembly and / or the roller assembly, and the heating body is disposed on and located within the mounting housing. The mounting housing securely mounts the heating body to the handle assembly, providing a sealed mounting space for the heating body. The heating body is built into the mounting housing, achieving enclosed heating, reducing heat loss, improving heating efficiency, rapidly heating and maintaining a constant temperature, ensuring even and long-lasting hair styling, while preventing direct exposure of the heating body to avoid accidental burns and improving user safety. The roller assembly is sleeved on the outside of the mounting housing, allowing it to absorb heat generated by the heating body, while the user can smoothly rotate it to perform curling operations.

[0014] In one embodiment, the heating body includes a heating shell, a heating element, and a heat-conducting element. The heating shell is disposed on the mounting housing and located on the inner wall of the mounting housing. The heating element is disposed on the heating shell. The control component is electrically connected to the heating element. There are at least two heat-conducting elements, which are disposed on the heating element and circumferentially distributed around it. By mounting the heating shell on the inner wall of the mounting housing, a stable support is provided for the heating element and the heat-conducting element, while also providing protection to prevent damage to internal components. The heating element is electrically connected to the control component, allowing for flexible temperature adjustment to suit different hair types. The at least two heat-conducting elements circumferentially distributed on the heating element enable rapid heat transfer to the toothed assembly, achieving uniform heating of the toothed assembly from all directions, reducing heat loss, ensuring even and long-lasting hair styling, and preventing localized overheating damage to the hair strands. The heating body is entirely built-in, and with the protection of the heating shell, it prevents accidental burns and improves user safety.

[0015] In one embodiment, the heat-conducting component includes a heat-conducting back plate and heat-conducting contact plates. The heat-conducting back plate is disposed on the heating element, and the number of heat-conducting contact plates is at least two. The at least two heat-conducting contact plates are spaced apart along the width direction of the heat-conducting back plate and extend in a direction away from the heat-conducting back plate, abutting against the heating housing. The heat-conducting back plate provides a stable bearing base for the at least two heat-conducting contact plates, ensuring the integrity of the heat-conducting structure. The spaced-apart distribution of the at least two heat-conducting contact plates along the width direction of the heat-conducting back plate, extending in a direction away from the heat-conducting back plate and abutting against the heating housing, enables efficient heat conduction. The close contact between the heat-conducting contact plates and the heating housing allows for rapid transfer of heat generated by the heating element to the heating housing, then to the outer mounting housing, and finally to the gear hobbing assembly, ensuring uniform heating of the gear hobbing assembly. The spaced distribution design allows for more even heat distribution, avoiding localized heat buildup. At least two heat-conducting contact plates conduct heat simultaneously, achieving all-around constant temperature heating, ensuring even and long-lasting hair styling, while reducing heat loss and improving heating efficiency.

[0016] In one embodiment, the roller assembly includes a roller body, roller teeth, and mounting plates. The roller body is disposed on the heating element and located on its outer side wall. There are multiple roller teeth arranged on the roller body and distributed circumferentially. There are at least two mounting plates disposed on the roller body and located on opposite sides of the roller body. By distributing multiple roller teeth circumferentially along the roller body, at least two roller teeth can mesh with each other during curling, causing the roller assembly to rotate synchronously and smoothly. This ensures the hair is evenly clamped and heated from all directions, resulting in more regular wave textures and longer-lasting styling. The two mounting plates, disposed on the roller body and abutting against the heating element, enhance the stability of the roller body installation, preventing it from shifting or wobbling during rotation.

[0017] In one embodiment, a fixing component is also included. This fixing component comprises a fixing body and a fixing protrusion. The fixing protrusion is disposed on the fixing body, and the fixing body is detachable from the heating component. The fixing protrusion abuts against the toothed assembly. By detachably mounting the fixing body to the heating component, it serves as the core load-bearing component of the fixing component. Its abutment against the toothed assembly provides a basic fixing function, firmly limiting the toothed assembly and preventing loosening during rotation. The fixing protrusion, disposed on the fixing body, precisely conforms to the structure of the toothed assembly, enhancing the tightness of the fixation, preventing axial movement of the toothed assembly, and ensuring smooth rotation. Simultaneously, the detachable design of the fixing body, combined with the precise limiting of the fixing protrusion, ensures the stable installation of the toothed assembly and allows for easy removal of the fixing component when the toothed assembly needs to be replaced, enabling quick replacement of different specifications of toothed assemblies to switch curling effects.

[0018] In one embodiment, the control component includes a control button and an external power cord. The control button and the external power cord are both located on the handle assembly and are electrically connected. The external power cord is also electrically connected to the heating element. By placing the control button on the handle assembly, an ergonomic design is implemented, allowing users to easily operate it during curling. The operation is intuitive and effortless, allowing for quick switching of the heating switch and adjustment of temperature levels to suit different hair types. The external power cord, located on the handle assembly, serves as a power transmission carrier. One end connects to an external power source, and the other end is electrically connected to both the heating element and the control button, ensuring stable power transmission. The control button precisely controls the power supply and adjustment of the external power cord, thereby regulating the heating state of the heating element and preventing excessive heat from damaging the hair or insufficient heat from affecting the styling effect. The stable power transmission from the external power cord ensures continuous and even heating of the heating element, enabling efficient curling in conjunction with other components.

[0019] In one embodiment, a protective shell is also included. The number of protective shells is at least two, and at least two of the protective shells are detachably mounted on the handle assembly. Each of the at least two protective shells corresponds to and engages with at least two of the toothed roller assemblies. Each protective shell includes a main body and an accessory. The accessory is disposed on the main body of the protective shell. The main body of the protective shell is detachably mounted on the handle assembly and abuts against the handle assembly. The main body of the protective shell is positioned opposite to the toothed roller assemblies. By having at least two protective shells corresponding to at least two toothed roller assemblies and detachably mounted on the handle assembly, along with the main body of the protective shell, the accessory, and other components, the product's protective properties and safety are significantly improved. The main body of the protective shell, as a core protective component, is positioned opposite to the toothed roller assemblies. This prevents the toothed roller assemblies from contacting the outside environment and scratching their surface when the curling iron is idle or stored. It also prevents users from accidentally touching the high-temperature toothed roller assemblies and causing burns, thus improving safety. The accessory, mounted on the main body of the protective shell and abutting against the handle assembly, enhances the stability of the protective shell installation, preventing loosening or displacement during disassembly or use, and ensuring the protective effect. The protective housing must be removed before the gear hobbing assembly can be disassembled. This ensures the stability of the gear hobbing assembly during installation and allows for easy replacement of the gear hobbing assembly by first removing the protective housing and then removing the gear hobbing assembly. The operation logic is clear and balances protection and convenience.

[0020] In one embodiment, a drive component is further included, which is disposed on the handle assembly and / or the gear assembly. The drive component drives the gear assembly to rotate relative to the handle assembly, and is electrically connected to the control component. Through the control component on the handle, the user can easily start / stop and adjust the operation of the drive component with a single button, making operation simple and effortless. It eliminates the need to manually pull the hair ribbon to rotate the gears, significantly reducing operational difficulty. The drive component can drive each set of gear assemblies to rotate synchronously and uniformly. Combined with the intermeshing structure, it ensures a uniform and stable rotation speed, ensuring the hair is smoothly wound and transported with gentle force, reducing the problems of pulling and damaging hair quality from the root.

[0021] In one embodiment, a drive assembly is further included. The drive assembly is disposed on the handle assembly and / or the gear hobbing assembly. The drive assembly is electrically connected to the control assembly. The drive assembly includes a drive body and driven members. The drive body is disposed on the handle assembly. There are at least two driven members, each corresponding to one of the at least two gear hobbing assemblies. One driven member is drive-connected to the drive body. The gear hobbing assembly has a mounting plate with protrusions. The at least two driven members mesh with each other and are drive-connected. Each of the at least two driven members is drive-connected to one of the protrusions on the at least two gear hobbing assemblies. By mounting the drive body on the handle assembly and electrically connecting it to the control assembly, the user can start, stop, and adjust the working state of the drive body via the control assembly, making operation simple and effortless. A single driven component engages with the drive body, while the remaining driven components mesh sequentially to form a linked transmission structure. Power is transmitted step-by-step from the first driven component to all the driven components. Each driven component then engages with the protrusions on the mounting plate of the gear assembly, thus synchronously driving all the gear assemblies to rotate. Electric drive replaces manual pulling to rotate the gear assemblies, eliminating the need to continuously pull down the hair during curling, reducing the probability of hair damage. The clamped hair is heated evenly as it rolls with the gear assemblies, resulting in a uniform and consistent curl and better styling. The entire transmission structure relies on precise engagement between the protrusions and driven components, ensuring reliable transmission limits and preventing slippage or deviation during operation, resulting in high transmission efficiency. Furthermore, the drive assembly is assembled using the existing handle assembly and gear assembly structure, requiring no significant modifications to the original structure and simplifying assembly. With replaceable gear assemblies, the driven components can still maintain stable transmission even after changing to different sizes of gear assemblies, accommodating various styling needs.

[0022] In one embodiment, at least two of the toothed roller assemblies are rotatable relative to the heating assembly, and these assemblies mesh with each other during rotation. Multiple sets of toothed roller assemblies are mounted on the outside of the heating assembly and can rotate relative to each other. During operation, adjacent toothed roller assemblies mesh and rotate in tandem. This meshing structure ensures that at least two toothed roller assemblies rotate synchronously. Hair is then inserted into the gaps between the toothed roller assemblies and transported at a uniform speed, resulting in even force distribution throughout the process and preventing localized pulling, hair breakage, or other problems. The toothed roller assemblies rotate synchronously with the meshing mechanism, ensuring that the hair is in close contact with the heated toothed roller assemblies over a large area, resulting in sufficient and uniform heating. This leads to smooth and even curl texture and significantly improved styling durability. Attached Figure Description

[0023] Figure 1 The first perspective view of a toothed hair curler; Figure 2 The first exploded view of a toothed hair curler; Figure 3 A first perspective view of the handle assembly; Figure 4 This is a cross-sectional view of the handle assembly; Figure 5 This is a second perspective view of the handle assembly; Figure 6 This is a third perspective view of the handle assembly; Figure 7 This is a 3D view of the gear hobbing assembly; Figure 8 This is an exploded view of the gear hobbing assembly; Figure 9 This is a 3D view of the heating element; Figure 10 This is an exploded view of the heat-generating component; Figure 11 A 3D view of the control components; Figure 12 A 3D view of the fixed components; Figure 13 A 3D view to protect the outer casing; Figure 14 A second perspective view of a toothed hair curler; Figure 15 This is a second exploded view of a toothed hair curler; Figure 16 This is the third exploded view of a toothed hair curler.

[0024] The correspondence between the reference numerals and the component names is as follows: 1 Handle assembly, 11 First handle, 111 Guide rib, 12 Second handle, 13 Movable part, 131 Movable part body, 132 First guide, 133 Second guide, 14 Spring; 2. Gear hobbing assembly, 21. Roller body, 22. Roller teeth, 23. Mounting plate, 231. Protrusion; 3 Heating component, 31 Mounting housing, 32 Heating body, 321 Heating shell, 322 Heating element, 323 Thermal conductive element, 3231 Thermal conductive back plate, 3232 Thermal conductive contact plate; 4 control components, 41 control buttons, 42 external wiring; 5. Fixing components, 51. Fixing body, 52. Fixing protrusion; 6. Protective casing; 61. Protective casing body; 62. Assembly parts; 7. Drive components, 71. Drive body, 72. Follower. Detailed Implementation

[0025] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0026] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0027] The toothed hair curler of some embodiments of the present invention is described below with reference to the accompanying drawings. Example

[0028] like Figures 1 to 14 As shown, this embodiment discloses a toothed hair curler, including: a handle assembly 1; a toothed assembly 2, the number of which is at least two, the at least two toothed assemblies 2 are rotatable relative to the handle assembly 1, and the at least two toothed assemblies 2 mesh with each other when rotating relative to the handle assembly 1, the meshing points of adjacent toothed assemblies 2 are used for curling hair; a heating assembly 3, the heating assembly 3 is disposed on the toothed assembly 2 and / or the handle assembly 1, the heating assembly 3 is used to heat the toothed assembly 2; and a control assembly 4, the control assembly 4 is disposed on the handle assembly 1 and electrically connected to the heating assembly 3.

[0029] This application discloses a toothed hair curler, which addresses the shortcomings of traditional straighteners such as uneven heating, stiff styling, and easy damage to hair. This toothed hair curler features a reasonable structural design, significantly improving overall performance and user experience. The device uses a handle assembly 1 as the overall supporting body, making it easy to operate and hold. Two or more sets of toothed roller assemblies 2 can rotate relative to the handle assembly 1 and mesh with each other. The meshing area of ​​adjacent toothed roller assemblies 2 serves as the curling station, changing the traditional single-sided squeezing operation of straighteners. After the hair is placed in the meshing position, the synchronous rotation of the toothed roller assemblies 2 completes the curling action, resulting in even and gentle force on the hair strands, effectively avoiding pulling and pinching damage. Heating components 3 are arranged on the toothed roller assemblies 2 and the handle assembly 1, providing comprehensive heating to the toothed roller assemblies 2. Compared to the limited heating area of ​​traditional straighteners, this structure allows for full contact between the hair strands and the heating element, resulting in more even and comprehensive heating, stable temperature rise, and high heat utilization. The resulting curls have natural and smooth textures, full curls, and significantly improved styling effect and durability. The control component 4 is integrated into the handle component 1 and electrically connected to the heating component 3, allowing users to easily control the start / stop and temperature settings. The operation is simple and intuitive. The overall structure has strong linkage, and the gear meshing rotation is smooth, balancing safety, diverse design, and ease of operation.

[0030] like Figure 1 and Figure 2As shown, in addition to the features of the above embodiments, this embodiment further specifies that the toothed roller assembly 2 is detachably mounted on the handle assembly 1 and / or the heating assembly 3. This detachable structure allows users to quickly disassemble and replace different specifications of the toothed roller assembly 2 according to their styling needs, creating curls of varying sizes (large, medium, small), easily achieving diverse and personalized hairstyle designs without the need to purchase multiple curling irons of different models, significantly reducing usage costs. Furthermore, the overall size is smaller after disassembly, making storage and portability more convenient, suitable for various usage scenarios such as home and travel. The disassembly and assembly process of the toothed roller assembly 2 is simple; after assembly, it can still precisely cooperate with other components, maintaining normal meshing rotation and heat conduction performance, ensuring stable operation without slippage.

[0031] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the heating component 3 is disposed on the handle assembly 1, the toothed assembly is rotatably disposed on the handle assembly 1, and at least a portion of the heating component 3 extends into the handle assembly 1. The embedded design of the heating component 3 allows it to form a protective structure based on the handle housing 1, effectively isolating it from external impacts and dust intrusion, reducing the probability of damage to the heating component, extending its service life, and preventing the heating structure from being exposed, thus reducing the risk of accidental burns and improving safety. The heat generated by the heating component 3 can be evenly conducted to the outer toothed assembly 2 through the mounting housing 31. The heat transfer path is short, with less loss, resulting in higher heating efficiency, allowing the toothed assembly 2 to heat up quickly and evenly, ensuring the curling and styling effect.

[0032] like Figure 1 and Figure 2 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the heating component 3 is disposed on the tooth rolling assembly 2, and the tooth rolling assembly 2 is rotatably disposed on the handle assembly 1. By disposing of the heating component 3 on the tooth rolling assembly 2, heat can be directly applied to the tooth rolling assembly 2, significantly shortening the conduction path, resulting in low heat loss and rapid heating, allowing the tooth rolling assembly 2 to be heated evenly over its entire surface. When hair contacts and wraps around the tooth rolling assembly 2, synchronous heating can be achieved, ensuring sufficient and consistent heating, effectively improving the efficiency and durability of curl styling, and creating a naturally textured curly hairstyle.

[0033] like Figure 1 and Figure 2As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the heating component 3 is disposed on the handle assembly 1, the toothed assembly 2 is rotatably disposed on the handle assembly 1, the toothed assembly 2 is provided with an adapter channel, and the heating component 3 is at least partially located within the adapter channel. By embedding the heating component 3 into the adapter channel, the two are fitted together with a gap, which not only does not hinder the flexible rotation of the toothed assembly 2, but also significantly shortens the heat transfer distance, reduces heat loss, and improves heat conduction efficiency, allowing the toothed assembly 2 to heat up quickly and evenly. During operation, the toothed assembly 2 can rotate around the heating component 3 or rotate synchronously with the heating component 3, ensuring even heating throughout and stable temperature when in contact with the hair strands, effectively improving the curling effect and durability.

[0034] like Figure 2 , Figure 3 and Figure 4 As shown, in addition to the features of the above embodiments, this embodiment further defines: the handle assembly 1 includes a first handle 11, a second handle 12, a movable member 13, and a spring 14. The second handle 12 is disposed on the first handle 11, and the first handle 11 is rotatable relative to the second handle 12 and / or the second handle 12 is rotatable relative to the first handle 11. The movable member 13 is disposed on the first handle 11 and the second handle 12 and is capable of reciprocating relative to the first handle 11 and the second handle 12. The spring 14 is clamped between the first handle 11 and the second handle 12. At least two gear hobbing assemblies 2 are disposed on the first handle 11 and the second handle 12. A heating assembly 3 is disposed on the first handle 11 and / or the second handle 12 and / or the gear hobbing assemblies 2. A control assembly 4 is disposed on the first handle 11 or the second handle 12. The first handle 11 serves as the basic load-bearing component, firmly supporting the second handle 12 and other functional components. The second handle 12 and the first handle 11 can rotate relative to each other. With the spring 14 clamped between them, the handle can be opened and closed elastically, allowing the user to easily control the clamping force. In use, the user pushes the movable part 13 to reciprocate relative to the first and second handles, thus retracting or unfolding the first handle 11 and the second handle 12, facilitating flexible use of the toothed curling iron. The spring 14 provides uniform rebound force, ensuring smooth opening and closing of the handles and precise resetting, preventing jamming and reducing user fatigue. The movable part 13 further enhances the stability and smoothness of the handle opening and closing, preventing loosening or deviation during operation. The heating element 3 is located on the first handle 11 and / or the second handle 12 and / or the toothed component 2. Engaging with the toothed component 2 during curling, it provides even heating of the hair from all directions, improving the styling effect. The control element 4 is located on the first handle 11 or the second handle 12, allowing convenient adjustment of the heating state of the heating element 3, making operation intuitive and effortless.

[0035] like Figure 3 and Figure 4As shown, in addition to the features of the above embodiments, this embodiment further defines that: when the movable member 13 reciprocates relative to the first handle 11 and the second handle 12, the movable member 13 has at least a first position and a second position relative to the first handle 11 and / or the second handle 12. When the movable member 13 is in the first position, the second handle 12 and the first handle 11 are close to each other, and the spring 14 is compressed. When the movable member 13 is in the second position, the second handle 12 and the first handle 11 are far apart, and the spring 14 is extended. With the first handle 11 as the basic bearing component, the second handle 12 and other functional components are stably supported. When the movable member 13 reciprocates relative to the first handle 11 and the second handle 12, it can drive the state switching of the second handle 12 and the first handle 11. The precise opening and closing of the handle is achieved in conjunction with the extension and contraction of the spring 14. The first position is the storage state of the toothed hair curler, and the second position is the use state of the toothed hair curler. When the movable part 13 is in the first position, the second handle 12 and the first handle 11 move closer together, and the spring 14 is compressed. At this time, the gap between the gear components 2 decreases, resulting in a compact overall size that is easy to store and saves space. When the movable part 13 is in the second position, the second handle 12 and the first handle 11 move further apart, the spring 14 extends, and the gap between the gear components 2 increases, making it easier to insert hair and facilitating operation. The extension and retraction of the spring 14 provides a uniform rebound force, ensuring smooth and precise return when the handles switch positions. The movable part 13 ensures the stability of the position switching and prevents deviation.

[0036] like Figure 3 , Figure 5 and Figure 6 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the movable component 13 includes a movable component body 131, a first guide component 132, and a second guide component 133. The first handle 11 is provided with a guide rib 111. The first guide component 132 and the second guide component 133 are both disposed on the movable component body 131. The movable component body 131 is disposed on the first handle 11 and the second handle 12 and can reciprocate relative to the first handle 11 and the second handle 12. The first guide component 132 cooperates with the guide rib 111, and the second guide component 133 can abut against the second handle 12. By the movable component body 131 being erected between the first handle 11 and the second handle 12, it provides basic support for the reciprocating motion. The precise cooperation between the first guide component 132 and the guide rib 111 can limit the movement trajectory of the movable component 13, preventing it from deviating or jamming during reciprocating motion, and ensuring precise and controllable movement. The second guide component 133 abuts against the second handle 12, playing a limiting role during reset, further preventing the handle from deviating during reset, and ensuring the accuracy of position switching. When stored, the second handle 12 and the first handle 11 are close to each other and the spring 14 is compressed, resulting in a compact and space-saving overall size. When in use, the second handle 12 and the first handle 11 are far apart and the spring 14 is extended, increasing the spacing of the gear assembly 2 for easier operation.

[0037] like Figure 2 and Figure 9 As shown, in addition to the features of the above embodiments, this embodiment further defines: the heating component 3 includes a mounting housing 31 and a heating body 32. The mounting housing 31 is disposed on the handle assembly 1 and / or the toothed roller assembly 2, and the heating body 32 is disposed on the mounting housing 31 and located inside the mounting housing 31. The mounting housing 31 securely mounts the heating body 32 to the handle assembly 1, providing a sealed mounting space for the heating body 32. The heating body 32 is built into the mounting housing 31, achieving closed heating, which reduces heat loss, improves heating efficiency, rapidly heats up and maintains a constant temperature, ensuring even and long-lasting hair styling, while avoiding direct exposure of the heating body to prevent accidental burns and improves safety. The toothed roller assembly 2 is sleeved on the outside of the mounting housing 31, and can absorb the heat generated by the heating body 32 through the mounting housing 31, while allowing the user to smoothly rotate to perform the curling operation.

[0038] like Figure 9 and Figure 10 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the heating body 32 includes a heating shell 321, a heating element 322, and a heat-conducting element 323. The heating shell 321 is disposed on the mounting housing 31 and located on the inner wall of the mounting housing 31. The heating element 322 is disposed on the heating shell 321. The control component 4 is electrically connected to the heating element 322. The number of heat-conducting elements 323 is at least two, and the at least two heat-conducting elements 323 are disposed on the heating element 322 and distributed circumferentially around the heating element 322. By installing the heating shell 321 on the inner wall of the mounting housing 31, a stable support is provided for the heating element 322 and the heat-conducting element 323, while also providing protection to prevent damage to internal components. The heating element 322 is electrically connected to the control component 4, and the temperature can be flexibly adjusted by the control component 4 to adapt to different hair types. At least two heat-conducting elements 323 are circumferentially distributed on the heating element 322, which can quickly conduct heat to the toothed assembly 2, achieving uniform heating of the toothed assembly 2 from all directions, reducing heat loss, ensuring even and long-lasting hair styling, and avoiding localized overheating damage to the hair strands. The heating body 32 is built-in, and with the protection of the heating shell 321, it can prevent users from accidentally touching and burning themselves, improving the safety of use.

[0039] like Figure 10As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the heat-conducting component 323 includes a heat-conducting back plate 3231 and heat-conducting contact plates 3232. The heat-conducting back plate 3231 is disposed on the heating component 322. The number of heat-conducting contact plates 3232 is at least two. The at least two heat-conducting contact plates 3232 are spaced apart along the width direction of the heat-conducting back plate 3231. The at least two heat-conducting contact plates 3232 extend in a direction away from the heat-conducting back plate 3231 and abut against the heating shell 321. The heat-conducting back plate 3231 is stably disposed on the heating component 322, providing a stable load-bearing foundation and a heat-conducting foundation for the at least two heat-conducting contact plates 3232, ensuring the integrity of the heat-conducting structure. The at least two heat-conducting contact plates 3232 are spaced apart along the width direction of the heat-conducting back plate 3231 and extend in a direction away from the heat-conducting back plate 3231 and abut against the heating shell 321, which can achieve efficient heat conduction. The heat-conducting contact plate 3232 is in close contact with the heating shell 321, which can quickly transfer the heat generated by the heating element 322 to the heating shell 321, and then conduct it to the outer mounting shell 31. The mounting shell 31 then conducts it to the toothed assembly 2, ensuring that the toothed assembly 2 is heated evenly. The spaced distribution design can make the heat distribution more even and avoid local heat accumulation. At least two heat-conducting contact plates conduct heat simultaneously, realizing all-round constant temperature heating, ensuring that the hair styling is even and long-lasting, while reducing heat loss and improving heating efficiency.

[0040] like Figure 1 and Figure 7 As shown, in addition to the features of the above embodiments, this embodiment further defines: the roller assembly 2 includes a roller body 21, roller teeth 22, and mounting plates 23. The roller body 21 is disposed on the heating element 3 and located on the outer wall of the heating element 3. There are multiple roller teeth 22, which are disposed on the roller body 21 and distributed circumferentially. There are at least two mounting plates 23, which are disposed on the roller body 21 and located on opposite sides of the roller body 21. By distributing multiple roller teeth 22 circumferentially along the roller body 21, at least two roller teeth 22 can mesh with each other during curling, driving the roller assembly 2 to rotate synchronously and smoothly, ensuring that the hair is evenly clamped and heated from all directions, resulting in more regular wave texture and longer-lasting styling. The at least two mounting plates 23 disposed on the roller body 21 and abutting against the heating element 3 enhance the stability of the roller body 21 installation, preventing it from shifting or shaking during rotation.

[0041] like Figure 1 and Figure 12As shown, in addition to the features of the above embodiments, this embodiment further includes a fixing component 5. The fixing component 5 includes a fixing body 51 and a fixing protrusion 52. The fixing protrusion 52 is disposed on the fixing body 51. The fixing body 51 is detachable from the heating component 3. The fixing protrusion 52 abuts against the toothed assembly 2. By detachably disposing of the fixing body 51 on the heating component 3, it serves as the core load-bearing component of the fixing component 5. Its abutment against the toothed assembly 2 provides a basic fixing function, firmly limiting the toothed assembly 2 and preventing it from loosening during rotation. The fixing protrusion 52, disposed on the fixing body 51, can precisely fit the structure of the toothed assembly 2, enhancing the tightness of the fixation, preventing axial movement of the toothed assembly 2, and ensuring smooth rotation. At the same time, the detachable design of the fixing body 51, combined with the precise limiting of the fixing protrusion 52, ensures the stable installation of the toothed assembly 2 and allows for easy removal of the fixing component 5 when the toothed assembly 2 needs to be replaced, enabling quick replacement of different specifications of toothed assemblies 2 to switch curling effects.

[0042] like Figure 1 and Figure 11 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: the control component 4 includes a control button 41 and an external power cord 42. The control button 41 is disposed on the handle component 1, and the external power cord 42 is disposed on the handle component 1. The control button 41 is electrically connected to the external power cord 42, and the external power cord 42 is electrically connected to the heating component 3. By placing the control button 41 on the handle component 1, it conforms to ergonomic design, making it convenient for users to operate during hair curling. The operation is intuitive and effortless, allowing for quick switching of the heating switch and adjustment of temperature levels to suit the heating needs of different hair types. The external power cord 42, disposed on the handle component 1, serves as a power transmission carrier. One end is connected to an external power source, and the other end is electrically connected to the heating component 3 and the control button 41, achieving stable power transmission. The control button 41 can precisely control the power on / off and power adjustment of the external power cord 42, thereby regulating the heating state of the heating component 3 and preventing excessive heat from damaging the hair or insufficient heat from affecting the styling effect. The external power cord 42 provides stable power transmission, ensuring that the heating element 3 generates continuous and uniform heat, and works with other components to achieve efficient curling.

[0043] like Figure 1 and Figure 13As shown, in addition to the features of the above embodiments, this embodiment further specifies that it also includes a protective shell 6, the number of which is at least two, at least two protective shells 6 are detachable from the handle assembly 1, and at least two protective shells 6 correspond one-to-one with at least two toothed roller assemblies 2; the protective shell 6 includes a protective shell body 61 and an accessory 62, the accessory 62 is disposed on the protective shell body 61, the protective shell body 61 is detachable from the handle assembly 1 and the accessory 62 abuts against the handle assembly 1, and the protective shell body 61 is disposed opposite to the toothed roller assembly 2. By having at least two protective shells 6 correspond one-to-one with at least two toothed roller assemblies 2 and are detachable from the handle assembly 1, in conjunction with the protective shell body 61, accessory 62 and other components, the product's protectiveness and safety in use are significantly improved. The protective shell body 61, as the core protective component, is disposed opposite to the toothed roller assembly 2, which can prevent the toothed roller assembly 2 from contacting the outside world when the curling iron is idle or stored, thus preventing scratches on the surface of the toothed roller assembly 2, and at the same time preventing users from accidentally touching the high-temperature toothed roller assembly 2 and causing burns, thereby improving the safety in use. The fitting 62 is mounted on the protective housing body 61 and abuts against the handle assembly 1. This enhances the stability of the protective housing 6 during installation, preventing loosening or displacement during disassembly or use, and ensuring the protective effect. The protective housing 6 must be removed before the gear hobbing assembly 2 can be disassembled. This ensures the stability of the gear hobbing assembly 2 during installation and allows for easy replacement of the gear hobbing assembly 2 by first removing the protective housing 6 and then removing the gear hobbing assembly 2. The operation logic is clear, balancing protection and convenience. Example

[0044] like Figure 8 , Figure 15 and Figure 16 As shown, in addition to the features of the above embodiments, this embodiment further includes a drive component 7, which is disposed on the handle assembly 1 and / or the gear assembly 2. The drive component 7 drives the gear assembly 2 to rotate relative to the handle assembly 1, and is electrically connected to the control component 4. Through the control component 4 on the handle, the user can start / stop and adjust the operation of the drive component 7 with a single button, making operation simple and effortless. There is no need to manually pull the hair ribbon to drive the gears to rotate, significantly reducing the difficulty of operation. The drive component 7 can drive each set of gear assemblies 2 to operate synchronously, and with the intermeshing structure, ensures stable rotation speed, smooth winding and feeding of hair strands, and gentle force, reducing the problems of pulling and damaging hair quality from the root.

[0045] like Figure 8 , Figure 15 and Figure 16As shown, in addition to the features of the above embodiments, this embodiment further includes a drive assembly 7, which is disposed on the handle assembly 1 and / or the gear hobbing assembly 2. The drive assembly 7 is electrically connected to the control assembly 4. The drive assembly 7 includes a drive body 71 and driven members 72. The drive body 71 is disposed on the handle assembly 1. The number of driven members 72 is at least two, and the at least two driven members 72 are disposed one-to-one on at least two gear hobbing assemblies 2. One of the driven members 72 is drive-connected to the drive body 71. The gear hobbing assembly 2 is provided with a mounting plate 23, and the mounting plate 23 is provided with protrusions 231. The at least two driven members 72 mesh with each other and are drive-connected. The at least two driven members 72 are respectively drive-connected one-to-one with the protrusions 231 of the at least two gear hobbing assemblies 2. By installing the drive body 71 on the handle assembly 1 and electrically connecting it to the control assembly 4, the user can start, stop, and adjust the working state of the drive body 71 through the control assembly 4, making the operation simple and effortless. A single driven component 72 engages with the drive body 71, while the remaining driven components 72 mesh with each other sequentially, forming a linked transmission structure. Power is transmitted step by step from the first driven component 72 to all driven components 72. Each driven component 72 then engages with the protrusions 231 on the mounting plate of the gear assembly 2, thereby synchronously driving all gear assemblies 2 to rotate in unison. Electric drive replaces manual pulling to rotate the gear assembly 2, eliminating the need to continuously pull down the hair during the curling process, reducing the probability of hair damage. The clamped hair is heated evenly as it rolls with the gear assembly 2, resulting in a uniform and consistent curl and better styling. The entire transmission structure relies on the precise docking of the protrusions 231 and the driven components 72, ensuring reliable transmission and limiting, preventing slippage and deviation during operation, and achieving high transmission efficiency. Meanwhile, the drive component 7 is assembled based on the existing handle component 1 and gear hobbing component 2, without the need for major modifications to the original structure, making assembly convenient; with the replaceable gear hobbing component 2, the follower 72 can still transmit power stably after replacing the gear hobbing component 2 with different specifications, and is compatible with multiple size and shape requirements.

[0046] like Figure 1 As shown, in addition to the features of the above embodiments, this embodiment further specifies that: at least two toothed roller assemblies 2 can rotate relative to the heating assembly 3, and at least two toothed roller assemblies 2 mesh with each other when rotating relative to the heating assembly 3. By assembling multiple sets of toothed roller assemblies 2 on the outside of the heating assembly 3 and allowing them to rotate relative to each other, adjacent toothed roller assemblies 2 mesh and move in tandem during operation. The meshing structure enables the toothed roller assemblies 2 to rotate synchronously. After the hair is caught in the gaps of the toothed roller assemblies 2, it is conveyed at a uniform speed, with uniform force throughout the process, avoiding localized pulling, pinching, and hair breakage. The toothed roller assemblies 2 rotate synchronously with the meshing linkage, and the hair is in close contact with the heated toothed roller assemblies 2 over a large area, resulting in sufficient and uniform heating, neat and smooth curl texture, and significantly improved styling durability.

[0047] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0048] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A toothed hair curler, characterized in that, The toothed hair curler includes: Handle assembly (1); The number of the toothed assembly (2) is at least two, the at least two toothed assemblies (2) are rotatable relative to the handle assembly (1), the at least two toothed assemblies (2) mesh with each other when rotating relative to the handle assembly (1), and the meshing points of adjacent toothed assemblies (2) are used for curling hair; Heating component (3), the heating component (3) is disposed on the gear hobbing assembly (2) and / or the handle assembly (1), the heating component (3) is used to heat the gear hobbing assembly (2); A control component (4) is disposed on the handle assembly (1) and electrically connected to the heating component (3).

2. The toothed hair curler according to claim 1, characterized in that, The gear hobbing assembly (2) is detachably disposed on the handle assembly (1) and / or the heating assembly (3). And / or the heating element (3) is disposed on the handle assembly (1), the gear hobbing assembly (2) is rotatably disposed on the handle assembly (1), and at least a portion of the heating element (3) extends into the handle assembly (1); or the heating element (3) is disposed on the gear hobbing assembly (2), and the gear hobbing assembly (2) is rotatably disposed on the handle assembly (1); Alternatively, the heating element (3) is disposed on the handle assembly (1), the gear hobbing assembly (2) is rotatably disposed on the handle assembly (1), the gear hobbing assembly (2) is provided with an adapter channel, and the heating element (3) is at least partially located within the adapter channel.

3. The toothed hair curler according to claim 1, characterized in that, The handle assembly (1) includes a first handle (11), a second handle (12), a movable part (13), and a spring (14). The second handle (12) is disposed on the first handle (11). The first handle (11) is rotatable relative to the second handle (12) and / or the second handle (12) is rotatable relative to the first handle (11). The movable part (13) is disposed on the first handle (11) and the second handle (12) and is rotatable relative to the first handle (11) and the second handle (12). The spring (14) is sandwiched between the first handle (11) and the second handle (12). At least two gear hobbing assemblies (2) are disposed on the first handle (11) and the second handle (12). The heating assembly (3) is disposed on the first handle (11) and / or the second handle (12) and / or the gear hobbing assembly (2). The control assembly (4) is disposed on the first handle (11) or the second handle (12).

4. The toothed hair curler according to claim 3, characterized in that, When the movable part (13) reciprocates relative to the first handle (11) and the second handle (12), the movable part (13) has at least a first position and a second position relative to the first handle (11) and / or the second handle (12). When the movable part (13) is in the first position, the second handle (12) and the first handle (11) are close to each other and the spring (14) is compressed. When the movable part (13) is in the second position, the second handle (12) and the first handle (11) are far apart and the spring (14) is stretched.

5. The toothed hair curler according to claim 3, characterized in that, The movable component (13) includes a movable component body (131), a first guide (132) and a second guide (133). The first handle (11) is provided with a guide rib (111). The first guide (132) and the second guide (133) are both disposed on the movable component body (131). The movable component body (131) is disposed on the first handle (11) and the second handle (12) and can reciprocate relative to the first handle (11) and the second handle (12). The first guide (132) cooperates with the guide rib (111), and the second guide (133) can abut against the second handle (12).

6. The toothed hair curler according to claim 1, characterized in that, The heating component (3) includes a mounting housing (31) and a heating body (32). The mounting housing (31) is disposed on the handle assembly (1) and / or the gear hobbing assembly (2). The heating body (32) is disposed on the mounting housing (31) and located inside the mounting housing (31).

7. The toothed hair curler according to claim 6, characterized in that, The heating body (32) includes a heating shell (321), a heating element (322), and a heat-conducting element (323). The heating shell (321) is disposed on the mounting housing (31) and located on the inner side wall of the mounting housing (31). The heating element (322) is disposed on the heating shell (321). The control component (4) is electrically connected to the heating element (322). The number of heat-conducting elements (323) is at least two. At least two heat-conducting elements (323) are disposed on the heating element (322) and distributed circumferentially around the heating element (322).

8. The toothed hair curler according to claim 1, characterized in that, The gear hobbing assembly (2) includes a roller body (21), roller teeth (22) and mounting plates (23). The roller body (21) is disposed on the handle assembly (1) and located on the outer side wall of the heating assembly (3). There are multiple roller teeth (22), which are disposed on the roller body (21) and distributed circumferentially along the roller body (21). There are two mounting plates (23), which are disposed on the roller body (21) and located on both sides of the roller body (21).

9. The toothed hair curler according to claim 1, characterized in that, The control component (4) includes a control button (41) and an external wire (42). The control button (41) is disposed on the handle assembly (1), and the external wire (42) is disposed on the handle assembly (1). The control button (41) is electrically connected to the external wire (42), and the external wire (42) is electrically connected to the heating component (3). And / or may also include a fixing component (5), the fixing component (5) including a fixing body (51) and a fixing protrusion (52), the fixing protrusion (52) being disposed on the fixing body (51), the fixing body (51) being detachable from the heating component (3), and the fixing protrusion (52) abutting against the gear hobbing component (2).

10. The toothed hair curler according to claim 1, characterized in that, It also includes a protective shell (6), the number of which is at least two, at least two of the protective shells (6) are detachable from the handle assembly (1), and at least two of the protective shells (6) are in one-to-one correspondence with at least two of the gear assemblies (2); And / or also includes a drive assembly (7) disposed on the handle assembly (1) and / or the gear hobbing assembly (2), the drive assembly (7) being used to drive the gear hobbing assembly (2) to rotate relative to the handle assembly (1), the drive assembly (7) being electrically connected to the control assembly (4); And / or also includes a drive assembly (7), the drive assembly (7) being disposed on the handle assembly (1) and / or the gear hobbing assembly (2), the drive assembly (7) being electrically connected to the control assembly (4), the drive assembly (7) including a drive body (71) and a follower (72), the drive body (71) being disposed on the handle assembly (1), the number of the follower (72) being at least two, the at least two follower (72) being disposed one-to-one on at least two gear hobbing assemblies (2), one of the follower (72) being drivenly connected to the drive body (71), the gear hobbing assembly (2) being provided with a mounting plate (23), the mounting plate (23) being provided with a protrusion (231), the at least two follower (72) being meshed with each other and drivenly connected, the at least two follower (72) being drivenly connected one-to-one with the protrusion (231) of the at least two gear hobbing assemblies (2); And / or at least two of the gear hobbing assemblies (2) are rotatable relative to the heating assembly (3), and the gear hobbing assemblies (2) mesh with each other when they rotate relative to the heating assembly (3).

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