Hair straightener with adjustable plate spacing

Abstract

The invention discloses a hair straightener with an adjustable plate spacing, and belongs to the technical field of hair straightens.Before a hair straightener body is used, the positions of a traction rope connecting piece and a sliding block are adjusted according to the size of a palm of a user through an arranged limiting mechanism; under the limitation of the folding traction rope, the distance between the lower clamping plate and the upper clamping plate after being unfolded is matched with the size of the palm of a user, so that the aim of enabling the clamping action to be more labor-saving is achieved; when long-time perm from several minutes to dozens of minutes needs to be carried out, under the condition that it is ensured that the temperature is appropriate and scalding is avoided, the positions of the traction rope connecting piece and the sliding block can be independently adjusted, and the lower sliding block is matched with the traction rope connecting piece to actively straighten and fold the traction rope in the closed state of the lower clamping plate and the upper clamping plate; under the limitation of the folding traction rope, the lower clamping plate and the upper clamping plate cannot be unfolded by straightening the folding traction rope, so that the purposes that the lower clamping plate and the upper clamping plate are always kept in a closed state, and a user does not need to continuously apply clamping force are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of hair straighteners, in particular to a hair straightener with adjustable plate spacing. Background Art

[0002] The hair straightener uses electric current to heat the heating element (such as MCH, PTC or heating wire) of the hair straightener, which is then transmitted to the aluminum plate or ceramic plate to make it heat up. The hair is heated and softened by the heating element, and then cooled to achieve the purpose of straightening the hair. When using a hair straightener, you need to adjust the appropriate temperature according to your hair quality to avoid burns caused by excessive temperature; Most existing hair straighteners are set in a V shape and a torsion spring is set at the hinge shaft. When using, the hair straightener needs to be held by hand to make the two heating clamps fit the hair. The purpose of this is that when the temperature is not suitable, the user can loosen the hair straightener and use the elastic deformation recovery of the torsion spring to quickly unfold the heating clamps, thereby avoiding scalding the skin; Although this design avoids burns, in actual use, it is necessary to constantly apply pressure to the hair straightener to ensure that the heating plate fits the hair, which causes certain difficulties for users with small hands or poor grip strength when using it. When the hair straightener is released and both ends are fully extended, the distance between the two ends is too large, and the user's palm is too small to hold the farthest end of the hair straightener at the same time. Pressure can only be applied by holding the position close to the hinge axis. Since the lever principle cannot be used to reduce the force of the clamping action, more physical strength will be consumed during use. When a longer-lasting perm effect is required, the overall time required ranges from several minutes to more than ten minutes. Long-term holding and applying pressure will also give the user a poor experience. Summary of the invention

[0003] The purpose of the present invention is to solve the problem that when the hair straightener is loosened and the two ends are fully extended, the distance between the two ends is too large, and the user's palm is too small to hold the farthest end of the hair straightener at the same time, and pressure can only be applied by holding the position close to the hinge axis, which consumes more physical strength during use. Long-term holding and applying pressure will also make the user feel bad. A hair straightener with adjustable plate distance is proposed.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical plate spacing adjustable hair straightener: The hair straightener body comprises a lower clamping plate, an upper clamping plate and a first hinge shaft rotatably connecting the lower clamping plate and the upper clamping plate, the lower clamping plate and the upper clamping plate are connected by a limiting mechanism, the limiting mechanism comprises a mounting cavity mounted on the lower clamping plate and a second slide rail provided on the upper clamping plate, a traction rope connecting member and a slide block are slidably arranged in the mounting cavity and on the second slide rail, and a folding traction rope for limiting the adjustable spacing between the lower clamping plate and the upper clamping plate is connected between the traction rope connecting member and the slide block; When the traction rope connector and the slider are at the same vertical height, the folding traction rope is straightened when the lower clamp and the upper clamp are unfolded to the maximum. When the traction rope connector and the slider are at different vertical heights, the slider moves in cooperation with the traction rope connector to straighten the folding traction rope, so that the lower clamp and the upper clamp cannot be unfolded by straightening the folding traction rope.

[0005] As a further description of the above technical plate spacing adjustable hair straightener: An inclined slideway and a first slide rail are arranged inside the installation cavity, through grooves are opened on both sides of the slideway, and an adjustment mechanism connected to the traction rope connecting piece is slidably embedded on the first slide rail; The adjustment mechanism includes a mounting frame installed on the traction rope connecting piece, the mounting frame is in contact with the through groove and a lifting frame is provided on the surface sliding sleeve, the mounting frame and the lifting frame pass through the through groove and the lifting frame is connected to a slide table slidably embedded on the first slide rail, and a push block is installed on the slide table, which passes through the bottom of the mounting cavity and is in contact with the outer edge of the lower clamping plate.

[0006] As a further description of the above technical plate spacing adjustable hair straightener: The adjustment mechanism also includes a ball installation cavity installed in the middle of the installation frame, in which a ball is embedded and the ball is rollingly fitted with the inner wall of the slideway.

[0007] As a further description of the above technical plate spacing adjustable hair straightener: A tooth row is installed at the bottom of the first slide rail, and a locking mechanism cooperating with the tooth row is provided on the slide platform to fix the position of the traction rope connecting piece; The locking mechanism includes a second hinge shaft installed on the slide and a hook rotatably arranged on the second hinge shaft. Torsion springs are wound around both ends of the second hinge shaft. Both ends of the torsion spring are respectively connected to the second hinge shaft and the hook. The hook can be embedded in the tooth gap of the tooth row to fix the push block.

[0008] As a further description of the above technical plate spacing adjustable hair straightener: The locking mechanism also includes an abutment plate arranged on the hook, a spring telescopic rod arranged on the slide, and a button connected to the spring telescopic rod. The spring telescopic rod passes through the abutment plate and the top of the button abuts against the abutment plate. Pressing the button can cause the spring telescopic rod to contract and push the abutment plate, and the abutment plate drives the hook to rotate around the second hinge axis.

[0009] As a further description of the above technical plate spacing adjustable hair straightener: The push block is provided with an annular mounting groove which is in the same height as the button. The button is arranged in the mounting groove and penetrates through the mounting groove to be connected with the spring telescopic rod. When the lower clamp is used, the button is protected by the mounting groove so that the finger cannot touch the button when the button is held. A groove for fingers to be inserted into is formed on the surface of the installation groove on one side away from the first hinge shaft.

[0010] As a further description of the above technical plate spacing adjustable hair straightener: Positioning pins are arranged on both sides of the installation cavity, and a countersunk hole for installing the installation cavity is opened at the bottom of the lower clamping plate. The installation cavity can be detachably installed in the countersunk hole through the positioning pins.

[0011] As a further description of the above technical plate spacing adjustable hair straightener: A straight groove is provided on one side of the second slide rail and extends to the outer side of the upper clamping plate. The position of the slider is adjusted by a positioning mechanism. The positioning mechanism includes a connecting rod rotatably mounted on the slider and extending through the straight groove. A turning knob is installed at the end of the connecting rod, and the turning knob pushes the slider to move through the connecting rod.

[0012] As a further description of the above technical plate spacing adjustable hair straightener: A diamond-shaped fastener is sleeved and installed on the surface of the connecting rod, and two protrusions are set on the fastener. The inner wall of the straight groove opened on the surface of the upper clamping plate is respectively provided with an upper groove and a lower groove that cooperate with the fastener protrusions. The fastener rotates with the connecting rod and is embedded in the upper groove and the lower groove for limiting.

[0013] As a further description of the above technical plate spacing adjustable hair straightener: The connecting rod includes a fixed rod connected to the slider and a rotating sleeve rod connected to the fastener. An arc-shaped deflection groove is opened on the surface of the fixed rod and a positioning piece is arranged on the inner wall of the rotating sleeve rod. The positioning piece is rotatably arranged in the deflection groove and has an interference fit with the deflection groove. When the fastener rotates, the positioning piece rotates from one end of the deflection groove to the other end.

[0014] In summary, due to the use of the above-mentioned technical plate-adjustable distance hair straightener, the beneficial effects of the present invention are: 1. Through the setting of the limiting mechanism, before using the hair straightener body, the position of the traction rope connector and the slider is adjusted according to the size of the user's palm. Under the restriction of the folded traction rope, the distance between the lower clamping plate and the upper clamping plate after unfolding matches the size of the user's palm, so as to achieve the purpose of making the clamping action more labor-saving; 2. When a long perm lasting from a few minutes to more than ten minutes is required, the positions of the traction rope connector and the slider can be adjusted separately, provided that the temperature is appropriate and there is no burn. When the lower clamp and the upper clamp are closed, the slider cooperates with the traction rope connector to actively straighten the folding traction rope. Under the restriction of the folding traction rope, the lower clamp and the upper clamp cannot be unfolded by straightening the folding traction rope, thereby achieving the purpose of keeping the lower clamp and the upper clamp in a closed state at all times, and the user does not need to continuously apply the clamping force; 3. Compared with the traditional external frame-type limiting structure, the traction rope connector, the slider and the folding traction rope are all arranged inside the hair straightener body. The maximum distance between the lower clamping plate and the upper clamping plate can be adjusted by changing the position of the folding traction rope, and there is no redundant structure on the surface of the hair straightener body that may affect the user's grip comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a hair straightener with adjustable plate spacing is shown; Figure 2 A schematic diagram of a three-dimensional structure in which a folded traction rope is used to limit the unfolding range of the hair straightener to a minimum is shown; Figure 3 Shows Figure 2 A schematic diagram of the enlarged structure at A in the middle; Figure 4 A schematic diagram of a three-dimensional structure in which a folded traction rope is used to limit the unfolding range of the hair straightener to the maximum is shown; Figure 5 A partial front view cross-sectional structural schematic diagram of a hair straightener with adjustable plate spacing is shown; Figure 6 Shows Figure 5 A schematic diagram of the enlarged structure at B in the middle; Figure 7 A partial three-dimensional structural schematic diagram of the limiting mechanism and the adjusting mechanism is shown; Figure 8 A schematic diagram of a partial three-dimensional structure of the locking mechanism in a locked state is shown; Fig. 9 A schematic diagram of a partial three-dimensional structure of the locking mechanism when it is in an unlocked state is shown; Fig.10 A partial three-dimensional cross-sectional structural schematic diagram showing the movement of the adjustment mechanism within the limiting mechanism; Fig.11 A schematic diagram of the three-dimensional structure of the installation cavity is shown; Fig.12 A schematic diagram of the side cross-sectional structure of the hair straightener body and the positioning mechanism is shown; Fig.13 A schematic diagram of a three-dimensional cross-sectional structure of a connecting rod, a fastener and a knob is shown; Fig.14 Shows Fig.13 Schematic diagram of the enlarged structure at C in the middle; Fig.15 A partial front view cross-sectional structural schematic diagram of the positioning mechanism is shown; Fig.16 A partial front view cross-sectional structural schematic diagram is shown when the positioning mechanism moves and straightens the folded traction rope.

[0016] Legend: 10. Hair straightener body; 11. Lower clamping plate; 12. Upper clamping plate; 13. First hinge axis; 20. Limiting mechanism; 21. Mounting cavity; 211. Slideway; 212. Through groove; 213. First slide rail; 214. Tooth row; 215. Positioning pin; 22. Traction rope connector; 23. Second slide rail; 24. Sliding block; 25. Folding traction rope; 30. Adjustment mechanism; 31. Mounting frame; 32. Ball bearing mounting cavity; 33. Ball bearing; 34. Lifting frame; 35. Slide table; 36. Push block; 40. Locking mechanism; 41. Second hinge axis; 42. Hook; 43. Abutment plate; 44. Spring telescopic rod; 45. Mounting slot; 46. Button; 50. Positioning mechanism; 51. Connecting rod; 511. Fixing rod; 512. Deflection slot; 513. Rotating sleeve rod; 514. Positioning member; 52. Fastener; 53. Turning knob; 54. Upper card slot; 55. Lower card slot. DETAILED DESCRIPTION

[0017] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the hair straightener with adjustable technical plate spacing in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] In order to solve the problem that when the hair straightener is released and both ends are fully extended, the distance between the two ends is too large, and the user's palm is too small to hold the farthest end of the hair straightener at the same time, and pressure can only be applied by holding the position close to the hinge axis, which consumes more physical strength during use, and long-term holding and applying pressure will also make the user feel bad, the present invention proposes a hair straightener with adjustable plate spacing, such as Figure 1 - Fig.16 As shown: The hair straightener body 10 includes a lower clamping plate 11, an upper clamping plate 12 and a first hinge shaft 13 rotatably connecting the lower clamping plate 11 and the upper clamping plate 12. The lower clamping plate 11 and the upper clamping plate 12 are connected by a limiting mechanism 20. Figure 2, Figure 4 and Figure 5 As shown, the limiting mechanism 20 includes a mounting cavity 21 mounted on the lower clamping plate 11 and a second slide rail 23 provided on the upper clamping plate 12, a traction rope connecting member 22 and a slider 24 are slidably arranged in the mounting cavity 21 and on the second slide rail 23, and a folding traction rope 25 for limiting the adjustable spacing between the lower clamping plate 11 and the upper clamping plate 12 is connected between the traction rope connecting member 22 and the slider 24; Before using the hair straightener body 10, the positions of the traction rope connector 22 and the slider 24 are adjusted according to the size of the user's palm. The traction rope connector 22 moves inside the installation cavity 21, and the slider 24 moves under the restriction of the second slide rail 23. The folded traction rope 25 moves with the traction rope connector 22 and the slider 24. When the traction rope connector 22 and the slider 24 move to a suitable position and are at the same vertical height, the lower clamping plate 11 and the upper clamping plate 12 are automatically unfolded under the push of the torsion spring in the first hinge shaft 13, and the folded traction rope 25 is pulled until it is straightened. Under the restriction of the folded traction rope 25, the distance between the lower clamping plate 11 and the upper clamping plate 12 after unfolding matches the size of the user's palm. The user can hold the clamping plate at a position far away from the first hinge axis 13 to apply pressure. Under the condition that the force applied by the user is the same, applying the force at a position far away from the first hinge axis 13 will cause the lower clamping plate 11 and the upper clamping plate 12 to generate a relatively large clamping force, thereby achieving the purpose of making the clamping action more labor-saving. When the distance between the folded traction rope 25 and the first hinge axis 13 is the largest, the adjustable distance between the lower clamping plate 11 and the upper clamping plate 12 is the smallest, which is suitable for users with small palms and strength. If you want to achieve a more lasting perm effect, you need to perform a long perm for several minutes to more than ten minutes. After ensuring that the temperature is appropriate and there is no burn, you can adjust the position of the traction rope connector 22 and the slider 24 separately, such as Fig.16 As shown, the traction rope connector 22 and the slider 24 are at different vertical heights. When the lower clamping plate 11 and the upper clamping plate 12 are closed, the slider 24 cooperates with the traction rope connector 22 to actively straighten the folding traction rope 25. Under the restriction of the folding traction rope 25, the lower clamping plate 11 and the upper clamping plate 12 cannot be unfolded by straightening the folding traction rope 25, so that the lower clamping plate 11 and the upper clamping plate 12 are always kept in a closed state, and the user does not need to continuously apply the clamping force. Compared with the conventional external frame-type limiting structure, the traction rope connector 22, the slider 24 and the folding traction rope 25 are all arranged inside the hair straightener body 10, and the maximum distance between the lower clamping plate 11 and the upper clamping plate 12 when unfolded can be adjusted by changing the position of the folding traction rope 25, and no redundant structure that may affect the user's grip comfort is arranged on the surface of the hair straightener body 10.

[0019] In order to be able to adjust the position of the traction rope connecting member 22, such as Figure 5, Figure 7 and Fig.10 As shown, an inclined slideway 211 and a first slide rail 213 are provided inside the installation cavity 21, through grooves 212 are provided on both sides of the slideway 211, and an adjustment mechanism 30 connected to the traction rope connector 22 is slidably embedded on the first slide rail 213; The adjustment mechanism 30 includes a mounting frame 31 mounted on the traction rope connecting member 22, the mounting frame 31 is in contact with the through slot 212 and a lifting frame 34 is slidably sleeved on the surface, the mounting frame 31 and the lifting frame 34 pass through the through slot 212, and the lifting frame 34 is connected to a slide table 35 slidably embedded on the first slide rail 213, and a push block 36 is installed on the slide table 35, which passes through the bottom of the mounting cavity 21 and is in contact with the outer edge of the lower clamping plate 11; When the position of the traction rope connector 22 needs to be adjusted, the push block 36 is pushed so that the push block 36 drives the slide 35 to slide under the restriction of the first slide rail 213. At the same time, the slide 35 drives the mounting frame 31 to move in the through groove 212 through the lifting frames 34 on both sides. The mounting frame 31 moves along the surface of the slideway 211. Under the push of the slideway 211 and the restriction of the lifting frames 34, the mounting frame 31 can drive the traction rope connector 22 to move and rise and fall, and change the distance with the slider 24 while adjusting the position of the folded traction rope 25, so as to achieve the purpose of adjusting the unfolding distance between the lower clamping plate 11 and the upper clamping plate 12. Preferably, in order to enable the mounting frame 31 to move smoothly on the surface of the slide 211, the adjustment mechanism 30 also includes a ball mounting cavity 32 installed in the middle of the mounting frame 31, and the ball 33 is embedded in the ball mounting cavity 32, and the ball 33 rolls and fits with the inner wall of the slide 211. Through this design, the mounting frame 31 is in contact with the slide 211 through the ball mounting cavity 32 and the ball 33. When the mounting frame 31 moves, the ball 33 is driven to roll in the slide 211 through the ball mounting cavity 32, thereby achieving the purpose of reducing the friction when the mounting frame 31 moves.

[0020] After the traction rope connector 22 is moved to a suitable position, the position of the push block 36 needs to be restricted to avoid accidental touch during use. Figure 6 , Figure 8 and Fig. 9 As shown, a tooth row 214 is installed at the bottom of the first slide rail 213, and a locking mechanism 40 cooperating with the tooth row 214 is provided on the slide 35 to fix the position of the traction rope connector 22; The locking mechanism 40 includes a second hinge shaft 41 mounted on the slide 35 and a hook 42 rotatably disposed on the second hinge shaft 41. Torsion springs (not shown in the figure) are wound around both ends of the second hinge shaft 41. Both ends of the torsion spring are respectively connected to the second hinge shaft 41 and the hook 42. The hook 42 can be embedded in the tooth gap of the tooth row 214 to fix the push block 36. When it is necessary to release the restriction on the push block 36 so that the slide 35 can be pushed to move on the first slide rail 213, the hook 42 is rotated so that the hook 42 is rotated under the restriction of the second hinge shaft 41 and moves out of the gear row 214, and the restriction on the slide 35 by the hook 42 and the gear row 214 is released, and the push block 36 can push the slide 35 to move on the first slide rail 213; When the hook 42 rotates, it cooperates with the second hinge shaft 41 to pull the torsion spring. Under the action of the elastic deformation and reset of the torsion spring, the hook 42 reverses and resets after losing the external force that makes it rotate, and reinserts into the tooth gap of the tooth row 214, thereby achieving the purpose of fixing the slide 35 after the adjusted position; Preferably, the locking mechanism 40 further comprises an abutment plate 43 arranged on the hook 42, a spring telescopic rod 44 arranged on the slide 35, and a button 46 connected to the spring telescopic rod 44, the spring telescopic rod 44 passes through the abutment plate 43 and the top of the button 46 abuts against the abutment plate 43, pressing the button 46 can cause the spring telescopic rod 44 to contract and push the abutment plate 43, and the abutment plate 43 drives the hook 42 to rotate around the second hinge shaft 41; By pushing the button 46 , the button 46 moves under the restriction of the spring telescopic rod 44 and the spring telescopic rod 44 contracts. The abutting plate 43 abutting against the button 46 drives the hook 42 to rotate around the second hinge shaft 41 under the push of the button 46 .

[0021] In order to avoid accidentally touching the button 46 during use, the push block 36 is provided with an annular mounting groove 45 which is in the same height as the button 46. The button 46 is arranged in the mounting groove 45 and penetrates through the mounting groove 45 to be connected with the spring telescopic rod 44. When the lower clamping plate 11 is used, the button 46 is protected by the mounting groove 45, so that the finger cannot touch the button 46 when the lower clamping plate 11 is in the gripping state. A groove for fingers to enter is formed on the surface of the mounting slot 45 away from the first hinge shaft 13. When the button 46 needs to be pressed, the gripping posture needs to be actively adjusted to allow the finger to contact the button 46, thereby avoiding accidental touch.

[0022] When the folding traction rope 25 ages after long-term use and cannot be automatically folded after the lower clamping plate 11 and the upper clamping plate 12 are closed, the installation cavity 21 can be removed from the lower clamping plate 11 and the folding traction rope 25 can be replaced. Fig.11 As shown, positioning pins 215 are provided on both sides of the installation cavity 21, and a countersunk hole for installing the installation cavity 21 is opened at the bottom of the lower clamping plate 11. The installation cavity 21 is detachably installed in the countersunk hole through the positioning pins 215, thereby achieving the purpose of disassembling the installation cavity 21 and replacing the folding traction rope 25.

[0023] In order to be able to adjust the position of the slider 24, as Fig.12As shown, a straight groove penetrating to the outer side of the upper clamping plate 12 is opened on one side of the second slide rail 23, and the position of the slider 24 is adjusted by a positioning mechanism 50. The positioning mechanism 50 includes a connecting rod 51 rotatably mounted on the slider 24 and penetrating the straight groove. A knob 53 is installed at the end of the connecting rod 51. The knob 53 pushes the slider 24 to move through the connecting rod 51. By pushing the knob 53 to make it move horizontally along the length direction of the straight groove, the knob 53 drives the connecting rod 51 to move in the straight groove, and the sliding block 24 connected to the connecting rod 51 adjusts its position under the restriction of the second slide rail 23; Furthermore, the position of the slider 24 needs to be fixed after the adjustment is completed. Figure 3 , Fig.13 and Fig.15 As shown, a diamond-shaped fastener 52 is sleeved and installed on the surface of the connecting rod 51, and two protrusions are set on the fastener 52. The inner wall of the straight groove opened on the surface of the upper clamping plate 12 is respectively opened with an upper clamping groove 54 and a lower clamping groove 55 that match the protrusions of the fastener 52. The fastener 52 rotates with the connecting rod 51 and is embedded in the upper clamping groove 54 and the lower clamping groove 55 for limiting. By rotating the knob 53, the knob 53 drives the connecting rod 51 to rotate under the restriction of the slider 24. At the same time, the two protrusions of the fastener 52 are respectively embedded in the upper clamping groove 54 and the lower clamping groove 55 as the connecting rod 51 rotates. Under the restriction of the upper clamping groove 54 and the lower clamping groove 55, the fastener 52 can no longer move horizontally along the length direction of the straight groove with the knob 53, and the position of the slider 24 is fixed. In order to improve the fixing effect of the slider 24, as Fig.13 and Fig.14 As shown, the connecting rod 51 includes a fixed rod 511 connected to the slider 24 and a rotating sleeve rod 513 connected to the buckle 52. An arc-shaped deflection groove 512 is opened on the surface of the fixed rod 511 and a positioning piece 514 is arranged on the inner wall of the rotating sleeve rod 513. The positioning piece 514 is rotatably arranged in the deflection groove 512 and has an interference fit with the deflection groove 512. When the buckle 52 rotates, the positioning piece 514 rotates from one end of the deflection groove 512 to the other end. While limiting the maximum angle of the rotating sleeve rod 513 driving the buckle 52 to rotate, the rotating sleeve rod 513 is limited by the interference fit between the positioning piece 514 and the deflection groove 512, so that it cannot drive the buckle 52 to rotate by itself, thereby improving the stability of the buckle 52 in the upper groove 54 and the lower groove 55.

[0024] The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes to the hair straightener with adjustable plate spacing and the inventive concept according to the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A hair straightener with adjustable plate spacing, comprising a hair straightener body (10), wherein the hair straightener body (10) comprises a lower clamping plate (11), an upper clamping plate (12) and a first hinge shaft (13) rotatably connecting the lower clamping plate (11) and the upper clamping plate (12), characterized in that: The lower clamping plate (11) and the upper clamping plate (12) are connected via a limiting mechanism (20), the limiting mechanism (20) comprising a mounting cavity (21) mounted on the lower clamping plate (11) and a second slide rail (23) provided on the upper clamping plate (12), a traction rope connecting member (22) and a sliding block (24) being slidably disposed in the mounting cavity (21) and on the second slide rail (23), respectively, and a folding traction rope (25) for limiting the adjustable spacing between the lower clamping plate (11) and the upper clamping plate (12) being connected between the traction rope connecting member (22) and the sliding block (24); When the traction rope connector (22) and the slider (24) are located at the same vertical height, the folding traction rope (25) is straightened when the lower clamping plate (11) and the upper clamping plate (12) are unfolded to the maximum; when the traction rope connector (22) and the slider (24) are located at different vertical heights, the slider (24) cooperates with the traction rope connector (22) to straighten the folding traction rope (25) when moving, so that the lower clamping plate (11) and the upper clamping plate (12) cannot be unfolded by straightening the folding traction rope (25).

2. The hair straightener with adjustable plate spacing according to claim 1, characterized in that: An inclined slideway (211) and a first slide rail (213) are provided inside the installation cavity (21), through grooves (212) are provided on both sides of the slideway (211), and an adjustment mechanism (30) connected to the traction rope connector (22) is slidably embedded on the first slide rail (213); The adjustment mechanism (30) comprises a mounting frame (31) mounted on the traction rope connecting member (22); the mounting frame (31) is in contact with the through groove (212) and a lifting frame (34) is provided on the surface of the mounting frame (31) for sliding; the mounting frame (31) and the lifting frame (34) pass through the through groove (212) and the lifting frame (34) is connected to a slide table (35) slidably embedded on the first slide rail (213); a push block (36) is installed on the slide table (35) and passes through the bottom of the mounting cavity (21) and is in contact with the outer edge of the lower clamping plate (11).

3. The hair straightener with adjustable plate spacing according to claim 2, characterized in that: The adjustment mechanism (30) further comprises a ball installation cavity (32) installed in the middle of the installation frame (31), a ball (33) being embedded in the ball installation cavity (32), and the ball (33) rollingly fits against the inner wall of the slideway (211).

4. The hair straightener with adjustable plate spacing according to claim 2, characterized in that: A tooth row (214) is installed at the bottom of the first slide rail (213), and a locking mechanism (40) cooperating with the tooth row (214) is provided on the slide platform (35) to fix the position of the traction rope connecting member (22); The locking mechanism (40) comprises a second hinge shaft (41) mounted on the slide (35) and a hook (42) rotatably arranged on the second hinge shaft (41); torsion springs are wound around both ends of the second hinge shaft (41); both ends of the torsion spring are respectively connected to the second hinge shaft (41) and the hook (42); the hook (42) can be embedded in the tooth gap of the tooth row (214) to fix the push block (36).

5. The hair straightener with adjustable plate spacing according to claim 4, characterized in that: The locking mechanism (40) further comprises an abutment plate (43) arranged on the hook (42), a spring telescopic rod (44) arranged on the slide (35), and a button (46) connected to the spring telescopic rod (44); the spring telescopic rod (44) passes through the abutment plate (43) and the top of the button (46) abuts against the abutment plate (43); pressing the button (46) can cause the spring telescopic rod (44) to contract and push the abutment plate (43); the abutment plate (43) drives the hook (42) to rotate about the second hinge shaft (41).

6. The hair straightener with adjustable plate spacing according to claim 5, characterized in that: The push block (36) is provided with an annular mounting groove (45) having the same height as the button (46); the button (46) is arranged in the mounting groove (45) and penetrates the mounting groove (45) to be connected with the spring telescopic rod (44); when the lower clamping plate (11) is used, the button (46) is protected by the mounting groove (45), so that the button (46) cannot be touched by fingers in a gripping state; A groove for inserting a finger is provided on the surface of the installation slot (45) on one side away from the first hinge shaft (13).

7. The hair straightener with adjustable plate spacing according to claim 2, characterized in that: Positioning pins (215) are provided on both sides of the installation cavity (21), and a countersunk hole for installing the installation cavity (21) is provided at the bottom of the lower clamping plate (11), and the installation cavity (21) is detachably installed in the countersunk hole via the positioning pins (215).

8. The hair straightener with adjustable plate spacing according to claim 1, characterized in that: A straight groove extending through the outer side of the upper clamping plate (12) is formed on one side of the second slide rail (23). The position of the slider (24) is adjusted by a positioning mechanism (50). The positioning mechanism (50) comprises a connecting rod (51) rotatably mounted on the slider (24) and extending through the straight groove. A rotating knob (53) is mounted at the end of the connecting rod (51). The rotating knob (53) pushes the slider (24) to move via the connecting rod (51).

9. The hair straightener with adjustable plate spacing according to claim 8, characterized in that: A diamond-shaped fastener (52) is sleeved and installed on the surface of the connecting rod (51), and two protrusions are arranged on the fastener (52). An upper clamping groove (54) and a lower clamping groove (55) are respectively arranged on the inner wall of the straight groove opened on the surface of the upper clamping plate (12) to cooperate with the protrusions of the fastener (52). The fastener (52) rotates with the connecting rod (51) and is embedded in the upper clamping groove (54) and the lower clamping groove (55) for limiting.

10. The hair straightener with adjustable plate spacing according to claim 8, characterized in that: The connecting rod (51) comprises a fixed rod (511) connected to the slider (24) and a rotating sleeve rod (513) connected to the buckle (52); an arc-shaped deflection groove (512) is provided on the surface of the fixed rod (511); a positioning piece (514) is provided on the inner wall of the rotating sleeve rod (513); the positioning piece (514) is rotatably disposed in the deflection groove (512) and is interference-fitted with the deflection groove (512); when the buckle (52) rotates, the positioning piece (514) rotates from one end of the deflection groove (512) to the other end.

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