Hair curler

Abstract

The embodiment of the utility model provides a hair curler which comprises a handle provided with a control assembly; the heating rod comprises a heat conduction pipe and a heating element; the outer hair grabbing claw comprises an outer connecting ring pivoted at the front end part of the handle and a plurality of outer claw fingers which are formed by protruding at one end, deviating from the handle, of the outer connecting ring and are uniformly distributed on the outer side of the heating rod along the circumferential direction; the rotary driving mechanism is assembled in the handle and connected with the control assembly, and the output end of the rotary driving mechanism is in transmission connection with the outer connecting ring so as to drive the outer hair grabbing claw to rotate according to a control instruction of the control assembly; the inner hair grabbing claw comprises an inner connecting ring which is pivoted at the front end part of the handle and is arranged between the heating rod and the outer hair grabbing claw, and inner claw fingers which are formed by protruding and extending from one end, deviating from the handle, of the inner connecting ring and are uniformly distributed on the outer side of the heating rod along the circumferential direction; the outer connecting ring and the inner connecting ring are respectively provided with an abutting and pushing protruding block and a stopping protruding block, wherein the abutting and pushing protruding block and the stopping protruding block abut against each other to drive the inner claw fingerstall to rotate correspondingly when the outer hair grabbing claws rotate correspondingly. According to the embodiment, the hair heating efficiency can be improved.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of hair styling appliances, in particular to a hair curler. Background Art

[0002] There is a conventional hair curler which includes a control handle, a heating rod assembled at the front end of the control handle, a rotating ring pivotally provided at the front end of the control handle and sleeved outside the heating rod, and a rotation driving mechanism assembled inside the control handle and drivingly connected to the rotating ring by an output shaft to drive the rotating ring to rotate. Wherein, a plurality of evenly distributed comb teeth protruding away from the control handle are provided at the periphery of the rotating ring, and the rotation driving mechanism drives the rotating ring to rotate, and the comb teeth guide the hair to be wound around the heating rod.

[0003] However, the inventor found in the specific implementation that since the distance between each comb tooth and the heating rod of the existing hair curler is usually large, it is difficult for the hair to be wound on the outer side surface of the heating rod, resulting in relatively poor heating efficiency of the heating rod for the hair and reducing the user experience. Summary of the Utility Model

[0004] The technical problem to be solved by the embodiment of the utility model is to provide a hair curler which can improve the heating efficiency for hair.

[0005] To solve the above technical problem, the embodiment of the utility model provides the following technical solution: a hair curler, comprising:

[0006] A handle provided with a control component;

[0007] A heating rod, comprising a heat conduction tube connected to the front end of the handle at one end and a heating element arranged inside the heat conduction tube;

[0008] An outer hair grasping claw, comprising an outer connecting ring pivotally provided at the front end of the handle and a plurality of outer claw fingers protruding from one end of the outer connecting ring away from the handle and evenly distributed circumferentially outside the heating rod;

[0009] A rotation driving mechanism assembled inside the handle and connected to the control component, and the output end is drivingly connected to the outer connecting ring to drive the outer hair grasping claw to rotate according to the control instruction of the control component; and

[0010] An inner hair grasping claw, comprising an inner connecting ring pivotally provided at the front end of the handle and between the heating rod and the outer hair grasping claw and inner claw fingers protruding from one end of the inner connecting ring away from the handle and evenly distributed circumferentially outside the heating rod, and a pushing convex block and a stopping convex block which are respectively arranged on the outer connecting ring and the inner connecting ring and are abutted against each other when the outer hair grasping claw rotates correspondingly to drive the inner claw fingers to rotate correspondingly.

[0011] Further, the pushing bump is disposed on the inner ring surface of the outer connection ring, and the blocking bump is disposed on the outer ring surface of the inner connection ring.

[0012] Further, at least one inner side surface of the outer claw fingers is provided with a pressing strip for pressing hair.

[0013] Further, the inner ring surface of the outer connection ring correspondingly protrudes to form the pushing bump at a position aligned with the outer claw finger provided with the pressing strip. An insertion groove extending along the length direction of the outer claw finger and having a bottom end penetrating into the corresponding pushing bump is formed on the inner side surface of the outer claw finger provided with the pressing strip, and the pressing strip is correspondingly embedded in the insertion groove.

[0014] Further, the hair curler is configured with a plurality of heating rods having different specifications and selectively assembled to the front end of the handle during use. The heating rod and the handle are fixedly connected through a rotary snap structure. Electric connector assemblies for electrically connecting the electric heating element provided in the heating rod and the control component in the handle are respectively provided on the bottom end surface of the heating rod and the front end surface of the handle.

[0015] Further, the rotary snap structure includes an L-shaped snap groove provided on one of the heating rod and the handle and a snap block provided on the other of the heating rod and the handle. The L-shaped snap groove includes an axial groove extending parallel to the length direction of the heating rod and a circumferential groove extending circumferentially and connected to the bottom end of the axial groove. A retaining protrusion for preventing the snap block from withdrawing from the circumferential groove is further provided on the groove wall of the circumferential groove adjacent to the axial groove. The snap block is inserted into the opening at the end of the axial groove far from the circumferential groove and elastically deforms by rotating relative to the central axis of the heating rod when moving to the bottom of the axial groove to cross over the retaining protrusion and enter the circumferential groove to achieve snap positioning.

[0016] Further, the control component includes a control circuit board. The electric connector assembly includes two groups of conductive posts provided on the bottom end surface of the heating rod and electrically connected to the positive and negative electrodes of the electric heating element respectively, a socket pivotally provided at the front end of the handle and having two groups of insertion holes, and two conductive parts fixed to the inner side of the socket and electrically connected to the positive and negative voltage terminals on the control circuit board by means of wires respectively. The two groups of conductive posts on the heating rod are correspondingly inserted into the insertion holes of the socket on the handle and each abuts against one of the conductive parts.

[0017] Further, a concave cavity for accommodating the socket is provided at the front end of the handle. A pivot post protrudes correspondingly from the middle of the bottom wall of the concave cavity. At least one travel limit groove formed by two limit blocks protruding correspondingly from the inner side wall of the concave cavity and arranged at a predetermined angle in the circumferential direction is formed on the inner side wall of the concave cavity. The middle of the socket is pivotally connected to the top end of the pivot post by means of a screw. The conductive part is attached to the inner surface of the socket. A convex post also protrudes from the periphery of the socket towards the bottom wall of the concave cavity. The convex post is inserted into the corresponding travel limit groove to limit the rotation angle of the socket.

[0018] Further, the heat conduction tube is obtained by truncating a profile with a predetermined cross-section. A slotted groove extending a predetermined length in the direction of the handle is provided on the tube wall of the heat conduction tube from the end face of the heat conduction tube far away from the handle. The predetermined length is not greater than four-fifths of the length of the heat conduction tube. The heating rod further includes an end cap. The end cap is correspondingly assembled at the end of the heat conduction tube where the slotted groove is formed and correspondingly stuffed into the slotted groove. A hair clamping groove for clamping hair is also formed on the part of the end cap stuffed into the slotted groove.

[0019] Further, the heating rod further includes a heat insulation end head detachably assembled on the outer side surface of the end cap. A side opening corresponding to and connected to the hair clamping groove is provided on the side surface of the heat insulation end head.

[0020] After adopting the above technical solutions, the embodiment of the present utility model has at least the following beneficial effects: By adding an inner hair grasping claw between the heating rod and the outer hair grasping claw in the embodiment of the present utility model, inner claw fingers are provided on the inner hair grasping claw, and the inner hair grasping claw rotates following the pushing of the pushing convex block on the outer hair grasping claw by means of the stopping convex block. Thus, when the outer claw fingers of the outer hair grasping claw guide the hair to wind under the drive of the rotation drive mechanism, the outer hair grasping claw will also drive the inner hair grasping claw to rotate, and then the inner claw fingers on the inner hair grasping claw will also guide the hair to wind, which can better guide the hair to gradually wind into the gap between the inner claw fingers and the heating rod, enabling the hair to fit more closely on the surface of the heating rod and improving the heating efficiency of the hair. Description of the Drawings

[0021] Figure 1 It is a schematic exploded view of an optional embodiment of the hair curler of the present utility model.

[0022] Figure 2 It is a schematic assembled view of an optional embodiment of the hair curler of the present utility model.

[0023] Figure 3 It is a schematic cross-sectional view of an optional embodiment of the hair curler of the present utility model along the abutting part of the pushing convex block and the stopping convex block.

[0024] Figure 4The utility model is a schematic diagram of the split structure of the hair grasping claw and the mainspring according to an optional embodiment of the hair curler.

[0025] Figure 5 The utility model is a schematic diagram of the disassembled structure of the heating rod and the handle of an optional embodiment of the hair curler.

[0026] Figure 6 The utility model is a schematic diagram of a fixing seat structure of a handle of an optional embodiment of the hair curler.

[0027] Figure 7 The utility model is a schematic structural diagram of the front end of the handle of an optional embodiment of the hair curler.

[0028] Figure 8 The figure is a schematic cross-sectional structure diagram of an optional embodiment of the hair curler of the utility model along the length direction.

[0029] Figure 9 This is a schematic diagram of the cross-sectional structure along the length direction at another angle of an optional embodiment of the hair curler of the utility model.

[0030] Figure 10 The utility model is a schematic diagram of the disassembled structure of a heating rod of an optional embodiment of the hair curler.

[0031] Figure 11 The utility model is a cross-sectional structural diagram of a heating rod of an optional embodiment of the hair curler. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present invention and are not intended to limit the present invention. In addition, the embodiments and features in the embodiments of the present application may be combined with each other without conflict.

[0033] like Figures 1 - 11 As shown, an optional embodiment of the utility model provides a hair curler, comprising:

[0034] A handle 1 is provided with a control assembly 10;

[0035] The heating rod 3 comprises a heat conducting tube 30 connected at one end to the front end of the handle 1 and a heating element 32 arranged inside the heat conducting tube 30;

[0036] The outer hair-grabbing claw 5 comprises an outer connecting ring 50 pivotally mounted on the front end of the handle 1 and a plurality of outer claw fingers 52 protruding from one end of the outer connecting ring 50 away from the handle 1 and uniformly distributed along the circumferential direction on the outer side of the heating rod 3;

[0037] A rotation drive mechanism 7, which is assembled in the handle 1 and connected to the control assembly 10, and whose output end is transmission-connected to the outer connecting ring 50 to drive the outer hair grabbing claw 5 to rotate according to the control instruction of the control assembly 10; and

[0038] The inner hair grabbing claw 9 comprises an inner connecting ring 90 pivotally arranged at the front end of the handle 1 and between the heating rod 3 and the outer hair grabbing claw 5, and inner claw fingers 92 protruding from one end of the inner connecting ring 90 away from the handle 1 and uniformly distributed along the circumferential direction on the outer side of the heating rod 3. The outer connecting ring 50 and the inner connecting ring 90 are respectively provided with a pushing protrusion 501 and a stopping protrusion 901 which abut against each other when the outer hair grabbing claw 5 rotates accordingly to drive the inner claw fingers 92 to rotate accordingly.

[0039] The embodiment of the utility model adds an inner hair grabbing claw 9 between the heating rod 3 and the outer hair grabbing claw 5, and an inner claw finger 92 is arranged on the inner hair grabbing claw 9. The inner hair grabbing claw 9 receives the push of the push protrusion 501 on the outer hair grabbing claw 5 by means of the stopping protrusion 901 and rotates accordingly. Therefore, when the rotation driving mechanism 7 drives the outer claw finger 52 of the outer hair grabbing claw 5 to guide the hair to be rolled, the outer hair grabbing claw 5 will also drive the inner hair grabbing claw 9 to rotate, and then the inner claw finger 50 on the inner hair grabbing claw 9 will also guide the hair to be rolled, which can better guide the hair to be gradually rolled to the gap between the inner claw finger 92 and the heating rod 3, so that the hair can be more closely attached to the surface of the heating rod 3, thereby improving the heating efficiency of the hair.

[0040] In an optional embodiment of the present invention, Figure 3 As shown, the push-pushing protrusion 501 is arranged on the inner ring surface of the outer connecting ring 50, and the stopping protrusion 901 is arranged on the outer ring surface of the inner connecting ring 90. In this embodiment, by arranging the push-pushing protrusion 501 and the stopping protrusion 901 in the above manner, the transmission parts of the two can be effectively hidden, and the transmission parts are prevented from being exposed and getting stuck in the hair. In another embodiment, the push-pushing protrusion 501 and the stopping protrusion 901 can also be respectively protruded from the corresponding end surfaces of the outer connecting ring 50 and the inner connecting ring 90, and the same matching effect can be achieved.

[0041] In a specific implementation, in order to ensure smooth push transmission and transmission efficiency, the total number of the push protrusions 501 and the stop protrusions 901 can be designed to be no less than 3, and the push protrusions 501 and the stop protrusions 901 are alternately arranged in the circumferential direction.

[0042] In an optional embodiment of the present invention, Figure 3 and Figure 4As shown, a hair pressing strip 521 for pressing against hair is provided on the inner side surface of at least one of the outer claw fingers 52. In this embodiment, the hair pressing strip 521 is further provided on the outer claw finger 52 facing the heating rod 3, so that the hair can be as close as possible to the surface of the heating rod 3, improving the heating efficiency. In a specific implementation, the hair pressing strip 521 should be made of elastic materials such as silica gel and rubber.

[0043] In an alternative embodiment of the present utility model, as Figure 3 and Figure 4 shown, a thrust bump 501 is formed by corresponding protrusion at a position on the inner ring surface of the outer connection ring 50 aligned with the outer claw finger 52 provided with the hair pressing strip 521. A groove 523 extending along the length direction of the outer claw finger 52 and having a bottom communicating with the inside of the corresponding thrust bump 501 is formed on the inner side surface of the outer claw finger 52 provided with the hair pressing strip 521, and the hair pressing strip 521 is correspondingly embedded in the groove 523. In this embodiment, by making the bottom of the groove 523 for embedding the hair pressing strip 521 communicate with the inside of the corresponding thrust bump 501, it is beneficial to ensure the effective alignment of the outer claw finger 52 and the inner claw finger 92.

[0044] In an alternative embodiment of the present utility model, as Figures 5 - 9 shown, the hair curler is configured with a plurality of heating rods 3 of different specifications that are assembled to the front end of the handle 1 during use. The heating rod 3 and the handle 1 are fixedly connected by a rotary snap structure 4. An electrical connector assembly 6 for electrically connecting the electric heating element provided inside the heating rod 3 and the control component 10 inside the handle 1 is respectively provided on the bottom end surface of the heating rod 3 and the front end surface of the handle 1. In this embodiment, the hair curler is provided with a variety of heating rods 3, each heating rod 3 is connected to the handle 1 by a rotary snap structure 4, and electrical connection is achieved through the electrical connector assembly 6. Therefore, during use, the user can flexibly replace different heating rods according to the actual situation of the user or different usage requirements, and the disassembly and assembly are convenient.

[0045] In an alternative embodiment of the present utility model, as Figures 5 - 9As shown, the rotary snap structure 4 includes an L-shaped snap groove 40 provided on one of the heating rod 3 and the handle 1, and a snap block 42 provided on the other of the heating rod 3 and the handle 1. The L-shaped snap groove 40 includes an axial groove 401 extending parallel to the length direction of the heating rod 3, and a circumferential groove 403 extending circumferentially and connected to the bottom end of the axial groove 401. A retaining projection 403a for preventing the snap block from exiting the circumferential groove 403 is further provided on the groove wall of the circumferential groove 403 adjacent to the axial groove 401. The snap block 42 is inserted into the L-shaped snap groove 40 from the opening at one end of the axial groove 401 away from the circumferential groove 403, and when it moves to the bottom of the axial groove 401, it rotates relative to the central axis of the heating rod 3 and elastically deforms to cross over the retaining projection 403a and enter the circumferential groove 403 to achieve snap positioning. In this embodiment, the L-shaped snap groove 40 includes an axial groove 401 and a circumferential groove 403. When specifically assembling the heating rod 3, the user can first insert the snap block 42 into the L-shaped snap groove 40 from the axial groove 401, and then rotate the heating rod 3 and apply a slight force to make the snap block 42 cross over the retaining projection 403a and enter the end of the circumferential groove 403, so as to quickly realize the assembly of the heating rod 3; moreover, the retaining projection 403a can prevent the snap block 42 from coming out and achieve stable positioning.

[0046] In an alternative embodiment of the present utility model, as Figures 5 - 9 shown, the control assembly 10 includes a control circuit board 101. The electrical connector assembly 6 includes two groups of conductive posts 60 provided on the bottom end surface of the heating rod 3 and electrically connected to the positive and negative electrodes of the electric heating element 32 respectively, a socket 62 pivotally provided at the front end of the handle 1 and provided with two groups of insertion holes 621, and two conductive parts 64 fixed inside the socket 62 and electrically connected to the positive and negative voltage terminals on the control circuit board 101 by means of wires respectively. The two groups of conductive posts 60 on the heating rod 3 are correspondingly inserted into the insertion holes 621 of the socket 62 on the handle 1 and each abut against one of the conductive parts 64. In this embodiment, the electrical connector assembly 6 uses the insertion of the conductive posts 60 into the insertion holes 621 of the socket 62 to achieve positioning; at the same time, the conductive posts 60 are in contact with the conductive parts 64 to achieve electrical connection, and the conductive parts 64 are then connected to the control circuit board 101 of the control assembly 10 by means of wires, and the circuit connection structure is simple. In specific implementation, it can be understood that each group of cooperating conductive posts 60 and insertion holes 621 can be one, two or more; in addition, the conductive part 64 can be a conductive layer formed on a substrate 66.

[0047] In an alternative embodiment of the present utility model, as Figures 5 - 9As shown, a concave cavity 12 for accommodating the socket 62 is provided at the front end of the handle 1. A pivot post 121 protrudes correspondingly from the middle of the bottom wall of the concave cavity 12. At least one travel limit groove 124 formed by two limit blocks 123 protruding correspondingly from the inner side wall of the concave cavity 12 and arranged at a predetermined angle in the circumferential direction is formed on the inner side wall of the concave cavity 12. The middle of the socket 62 is pivotally connected to the top end of the pivot post 121 by means of a screw. The conductive part 64 is attached to the inner surface of the socket 62. A convex post 623 also protrudes from the periphery of the socket 62 towards the bottom wall of the concave cavity 12. The convex post 623 is inserted into the corresponding travel limit groove 124 to limit the rotation angle of the socket 62. In this embodiment, by pivotally connecting the socket 62 to the top end of the pivot post 121 protruding correspondingly in the concave cavity 12, the conductive post 60 can be correspondingly inserted into the insertion hole 621 on the socket 62. When assembling the heating rod 3 by using the aforementioned rotary snap structure 4, it is ensured that the socket 62 and the conductive part 64 will also rotate synchronously, and a buffer is provided by using a wire with an appropriate length reserved to ensure that the circuit connection will not be disconnected. In addition, by using the cooperation between the convex post 621 of the socket 62 and the travel limit groove 124, the rotation angle of the socket 62 can be effectively limited. In particular, it can prevent the socket 62 from rotating excessively and causing the wire to twist and become loose before the heating rod 3 is assembled. It can be understood that the rotation angle range defined by the travel limit groove 124 is adapted to the rotation angle range of the rotary snap structure, so as not to affect the normal disassembly and assembly operation of the heating rod 3. In addition, an avoidance groove 661 for the convex post 621 to pass through can also be provided on the substrate 66 formed with the conductive part 64, and the cooperation between the convex post 621 and the avoidance groove 661 can ensure that the conductive part 64 will rotate synchronously with the socket 62, and avoid the misalignment between the conductive part 64 and the conductive post 60.

[0048] In specific implementation, a fixed seat 14 is further provided in the handle 1. Structures such as the L-shaped snap groove 40, the socket 62, and the rotary drive mechanism 7 are all assembled on the fixed seat 14. In addition, the outer hair claw 5 is pivotally connected to the fixed seat 14 by means of a bearing. To prevent the bearing and the fixed seat 14 from being deformed by heat and disengaging, the inner ring of the bearing can be fastened to the fixed seat 14 by screws.

[0049] In an alternative embodiment of the present invention, as Figures 10 - 11As shown, the heat-conducting tube 30 is obtained by cutting off a profile with a predetermined cross-section, and the tube wall of the heat-conducting tube 30 is provided with a groove 301 extending from the end surface of the heat-conducting tube 30 away from the handle 1 to the direction of the handle 1 for a predetermined length, and the predetermined length is not greater than four-fifths of the length of the heat-conducting tube 30 (for example, 10 cm or 15 cm, etc., it can be understood that the minimum should not be less than 2 cm), and the heating rod 3 also includes an end cover 34, and the end cover 34 is assembled correspondingly to one end of the heat-conducting tube 30 formed with the groove 301 and correspondingly filled in the groove 301, and the part of the end cover 34 filling the groove 301 is also formed with a hair clamping groove 341 for clamping hair. In this embodiment, the heat conducting pipe 30 is obtained by cutting a profile, which is convenient for obtaining materials, and by providing a cut groove 301, the end cover 34 is filled in the cut groove 301 to form a hair clamping groove 341 for clamping hair, which is convenient for clamping and positioning the hair; and because the length of the cut groove 301 is less than half the length of the heat conducting pipe 30, the length of the cut groove 301 is relatively short, so that the heat conducting pipe 30 can have more side walls connected to facilitate heat transfer, thereby ensuring that the heat at various locations on the outer wall of the heat conducting pipe 30 is as uniform as possible.

[0050] In an optional embodiment of the present invention, Figures 10 - 11 As shown, the heating rod 3 further includes an anti-scalding end head 36 detachably assembled on the outer side of the end cover 34, and a side opening 361 is provided on the side of the anti-scalding end head 36, which is connected to the hair clip groove 341 in a one-to-one correspondence. In this embodiment, a detachable (for example, screw-locked, snap-fastened, etc.) anti-scalding end head 36 is provided to facilitate user operation and avoid burns.

[0051] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all belong to the protection scope of the utility model.

Claims

1. A hair curler, comprising: A handle provided with a control component; A heating rod, including a heat conduction tube connected at one end to the front end of the handle and a heating element disposed inside the heat conduction tube; An outer hair-gripping claw, including an outer connecting ring pivotally provided at the front end of the handle and a plurality of outer claw fingers protruding from one end of the outer connecting ring away from the handle and evenly distributed circumferentially outside the heating rod; And A rotary drive mechanism assembled inside the handle and connected to the control component, and the output end is drivingly connected to the outer connecting ring to drive the outer hair-gripping claw to rotate according to the control instruction of the control component; It is characterized in that the hair curler further includes: An inner hair-gripping claw, including an inner connecting ring pivotally provided at the front end of the handle and between the heating rod and the outer hair-gripping claw, and inner claw fingers protruding from one end of the inner connecting ring away from the handle and evenly distributed circumferentially outside the heating rod. Thrust bumps and stop bumps are respectively provided on the outer connecting ring and the inner connecting ring, which abut against each other when the outer hair-gripping claw rotates correspondingly to drive the inner claw fingers to rotate correspondingly.

2. The hair curler according to claim 1, wherein The thrust bump is provided on the inner ring surface of the outer connecting ring, and the stop bump is provided on the outer ring surface of the inner connecting ring.

3. The hair curler according to claim 1, characterized in that, At least one inner side surface of the outer claw finger is provided with a pressing strip for pressing the hair.

4. The hair curler according to claim 3, characterized in that, The inner ring surface of the outer connecting ring correspondingly protrudes to form the thrust bump at a position aligned with the outer claw finger provided with the pressing strip. The inner side surface of the outer claw finger provided with the pressing strip is provided with a slot extending along the length direction of the outer claw finger and having a bottom penetrating into the corresponding thrust bump, and the pressing strip is correspondingly embedded in the slot.

5. The hair curler according to claim 1, characterized in that, The hair curler is configured with a plurality of heating rods with different specifications and is assembled to the front end of the handle in a selected group during use. The heating rod is fixedly connected to the handle through a rotary snap structure. Electric connector components for electrically connecting the electric heating element provided in the heating rod and the control component in the handle are respectively provided on the bottom end surface of the heating rod and the front end surface of the handle.

6. The hair curler according to claim 5, wherein, The rotary snap structure includes an L-shaped snap groove provided on one of the heating rod and the handle and a block provided on the other of the heating rod and the handle. The L-shaped snap groove includes an axial groove extending parallel to the length direction of the heating rod and a circumferential groove extending circumferentially and connected to the bottom end of the axial groove. A retaining projection for preventing the block from exiting the circumferential groove is further provided on the groove wall of the circumferential groove adjacent to the axial groove. The block is inserted into the opening at one end of the axial groove away from the circumferential groove and elastically deforms and rotates relative to the central axis of the heating rod when moved to the bottom of the axial groove to cross over the retaining projection and enter the circumferential groove to achieve snap positioning.

7. The hair curler according to claim 5, wherein, The control component includes a control circuit board. The electrical connector component includes two conductive posts disposed on the bottom end surface of the heating rod and electrically connected to the positive and negative electrodes of the heating element respectively, a socket pivotally provided at the front end of the handle and having two insertion holes, and two conductive parts fixed inside the socket and electrically connected to the positive and negative voltage terminals on the control circuit board by means of wires. The two conductive posts on the heating rod are correspondingly inserted into the insertion holes of the socket on the handle and each abut against one of the conductive parts.

8. The hair curler according to claim 7, characterized in that, A concave cavity for accommodating the socket is provided at the front end of the handle. A pivot post protrudes correspondingly in the middle of the bottom wall of the concave cavity. At least one travel limit groove formed by two limit blocks protruding from the inner side wall of the concave cavity and arranged at a predetermined angle in the circumferential direction is formed on the inner side wall of the concave cavity. The middle of the socket is pivotally connected to the top of the pivot post by means of a screw. The conductive part is attached to the inner surface of the socket. A convex post protruding towards the bottom wall of the concave cavity is further formed on the periphery of the socket. The convex post is inserted into the corresponding travel limit groove to limit the rotation angle of the socket.

9. The hair curler according to claim 1 or 5, characterized in that, The heat conduction tube is obtained by truncating a profile with a predetermined cross-section. A cut groove extending a predetermined length in the direction of the handle is provided on the tube wall of the heat conduction tube from the end surface of the heat conduction tube far from the handle. The predetermined length is not greater than four-fifths of the length of the heat conduction tube. The heating rod further includes an end cap. The end cap is correspondingly assembled at the end of the heat conduction tube where the cut groove is formed and correspondingly stuffed into the cut groove. A hair clamping groove for clamping hair is further formed in the part of the end cap stuffed into the cut groove.

10. The hair curler according to claim 9, characterized in that, The heating rod further includes a heat insulation end head detachably assembled on the outer side surface of the end cap. Side openings corresponding to and connected to the hair clamping grooves are provided on the side surface of the heat insulation end head.

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