Positioning device for telescopic mechanism

Abstract

The utility model discloses a positioning device for a telescopic mechanism, which comprises a shell, a connecting wire, a telescopic assembly, a power transmission assembly and a self-locking positioning piece, the connecting wire is wound on the telescopic assembly, the telescopic assembly is rotatably arranged in the shell and is connected with the power transmission assembly, and the self-locking positioning piece is arranged in the shell and is connected with the power transmission assembly. The self-locking positioning piece is arranged on the shell, a self-locking positioning rail is arranged on one side of the telescopic assembly, and the self-locking positioning piece is used for positioning rotation of the self-locking positioning rail. The beneficial effects of the utility model lie in that the structure is further optimized by improving the self-locking positioning member and the self-locking positioning track, the wire drawing and wire returning have better hand feeling by increasing the number of the positioning rings and shortening the positioning distance, the structure of the power transmission assembly is further optimized, the production process is reduced, the production cost is reduced, and the production efficiency is improved. The power transmission power of the product is increased, and the stability and reliability of the product in use are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power transmission mechanisms, in particular to a positioning device for a telescopic mechanism. Background Art

[0002] Existing charging cables in the 3C charging field, such as charging cables for mobile phones, computers, tablets and other devices, all have external cables. They need to be rolled up when stored and then unfolded when used, which is extremely inconvenient. This problem can be solved by a retractable power transmission mechanism, but the existing power transmission mechanism is relatively large and cannot be self-locking. Most of them are for single sliding power transmission, and there will be power outages during use and insufficient stretching feel during use.

[0003] To this end, we propose a positioning device for a retractable mechanism to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a positioning device for a telescopic mechanism to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A positioning device for a retractable mechanism, comprising a housing 1, a connecting wire 2, a retractable assembly 3, a power transmission assembly 4 and a self-locking positioning member 5, wherein the connecting wire 2 is wound around the retractable assembly 3, and the retractable assembly 3 is rotatably arranged in the housing 1 and connected to the power transmission assembly 4;

[0007] The self-locking positioning member 5 is rotatably disposed on the housing 1 , and a self-locking positioning track 332 is disposed on one side of the telescopic assembly 3 . The self-locking positioning member 5 is used to position the rotation of the self-locking positioning track 332 .

[0008] Preferably, the self-locking positioning track 332 includes a plurality of outer rings 333, a plurality of middle rings 334, an inner ring 335 and a plurality of positioning blocks 336, and the outer rings 333 and the middle rings 334 are connected;

[0009] When the connecting line 2 is just pulled and the self-locking positioning track 332 rotates, the self-locking positioning member 5 slides from the inner ring 335 of the self-locking positioning track 332 to the outer ring 333 and slides between the outer ring 333 and the middle ring 334;

[0010] When the pulling of the connecting line 2 stops, under the action of the elastic member 32, the self-locking positioning track 332 rotates in the opposite direction, and the self-locking positioning member 5 is locked in the positioning block 336 of the self-locking positioning track 332;

[0011] When the connecting line 2 is slightly pulled again, the self-locking positioning member 5 slides from the positioning block 336 of the self-locking positioning track 332 to the inner ring 335 and slides in the inner ring 335 .

[0012] Preferably, one side of the telescopic component 3 is provided with side rails 35 matching the number of the outer rings 333, middle rails 36 matching the number of the middle rings 334, slide rails 37 and inner rails 38 matching the number of the positioning blocks 336, the side rails 35 are connected to the middle rails 36, the outer ring 333 is arranged between the side rails 35 and the slide rails 37, the middle ring 334 is arranged between the middle rails 36 and the slide rails 37, the inner ring 335 is arranged between the slide rails 37 and the inner rails 38, the positioning blocks 336 are arranged between the side rails 35 and the inner rails 38, and are arranged between adjacent slide rails 37;

[0013] The side rail 35 is provided with first sliding arcs 351 matching the number of the positioning blocks 336, the side rail 35 is connected to the middle rail 36 through the first sliding arcs 351, the inner rail 38 is provided with second sliding arcs 381 matching the number of the first sliding arcs 351, the first sliding arcs 351 and the second sliding arcs 381 are respectively provided at both ends of the positioning blocks 336;

[0014] The positioning block 336 is provided with a third sliding arc 337 and a fourth sliding arc 338, and a positioning bayonet 339 is provided between the third sliding arc 337 and the fourth sliding arc 338. The positioning bayonet 339 is a circular arc intersecting up and down, and is used to engage with the self-locking positioning member 5;

[0015] Inclined surfaces are provided on both sides of the slide rail 37 , one side of the slide rail 37 corresponds to the positioning bayonet 339 , and the other side of the slide rail 37 corresponds to the third sliding arc 337 .

[0016] Preferably, the self-locking positioning member 5 is provided with a positioning column 51 , and the positioning column 51 is approximately a triangle with a circular arc. The positioning column 51 is slidably disposed in the self-locking positioning track 332 and is used to be engaged with the positioning bayonet 339 .

[0017] Preferably, the housing 1 comprises a front housing 11 and a rear housing 12, the front housing 11 is connected to the rear housing 12, an axis 111 is provided on the front housing 11, and the telescopic assembly 3 is rotatably arranged on the axis 111;

[0018] The telescopic assembly 3 includes a first fixing member 31, an elastic member 32 and a second fixing member 33. A storage compartment 331 for placing the elastic member 32 is provided on one side of the second fixing member 33. The connecting wire 2 is wound around the storage compartment 331, and one end of the connecting wire 2 is connected to the power transmission assembly 4.

[0019] The accommodating chamber 331 is provided with an opening 341 , one end of the elastic member 32 is disposed outside the accommodating chamber 331 , and the other end is rolled into the accommodating chamber 331 through the opening 341 .

[0020] Preferably, the first fixing member 31 and the second fixing member 33 are provided with a mounting hole 34 corresponding to the axis 111, the first fixing member 31 and the second fixing member 33 are sleeved on the axis 111 through the mounting hole 34, and the first fixing member 31 is connected to the accommodating bin 331;

[0021] The axis 111 is provided with a slot 112 for engaging with the elastic member 32 , and the elastic member 32 is provided with a card corresponding to the slot 112 . The slot 112 of the axis 111 is engaged with the card of the elastic member 32 .

[0022] Preferably, the power transmission component 4 includes a movable plate 41 and a fixed plate 42 , and the movable plate 41 is connected to the second fixing member 33 and rotatably abuts against the fixed plate 42 .

[0023] Preferably, the movable plate 41 includes a plurality of connectors 411, a connecting plate 412 and a welding plate 413, each of the connectors 411 is distributed on the connecting plate 412 in parallel, and each of the connectors 411 can be rotatably abutted against the fixed plate 42;

[0024] The welding pad 413 is connected in series with the connector 411 , and one end of the connecting line 2 is connected to the welding pad 413 .

[0025] Preferably, the connector 411 includes an insulating material 414 and a plurality of conductive contacts 415 , wherein the conductive contacts 415 are connected to the insulating material 414 , and the conductive contacts 415 are rotatably in contact with the fixed plate 42 .

[0026] Preferably, the fixed plate 42 is connected to the rear shell 12, and is provided with an input terminal 421 for connecting to an external power supply and a conductive plate 422 for connecting to the connector 411, and is provided with a plurality of annular conductive tracks 416 on the conductive plate 422, and the conductive contacts 415 can rotatably abut against the annular conductive tracks 416.

[0027] Compared with the prior art, the beneficial effects of the utility model are: by improving the self-locking positioning parts and the self-locking positioning rails, the structure is further optimized, and by increasing the number of positioning rings and shortening the positioning distance, the pull wire and the return wire have a better feel. In addition, the structure of the power transmission component is further optimized, which not only increases the power transmission power of the product, but also reduces the production process and reduces the production cost. At the same time, the moving plate uses multiple connectors to allow the connector to fully contact with the fixed plate, which greatly increases the stability and reliability of the product during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is an exploded view of a positioning device for a retractable mechanism of the utility model;

[0030] Figure 2 It is a lateral exploded view of a positioning device for a retractable mechanism of the utility model;

[0031] Figure 3 It is a vertical exploded view of a positioning device for a retractable mechanism of the utility model;

[0032] Figure 4 This is a structural diagram of a self-locking positioning track of a positioning device for a retractable mechanism of the utility model;

[0033] Figure 5 This is a structural diagram of a self-locking positioning member of a positioning device for a retractable mechanism of the utility model;

[0034] Figure 6 This is a structural diagram of a movable plate of a positioning device for a retractable mechanism of the utility model;

[0035] Figure 7 This is a structural diagram of a connector for a positioning device of a retractable mechanism of the utility model;

[0036] Figure 8 This is a structural diagram of a signal transmission contact of a positioning device for a retractable mechanism of the utility model;

[0037] Fig. 9 The utility model is a structural diagram of a fixed plate of a positioning device for a telescopic mechanism. DETAILED DESCRIPTION

[0038] The following will be combined with the attached embodiment of the utility model Figure 1-9 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] Embodiment 1: A positioning device for a retractable mechanism, comprising a shell 1, a connecting line 2, a telescopic component 3, a power transmission component 4 and a self-locking positioning piece 5, the connecting line 2 is wound around the telescopic component 3, the telescopic component 3 is rotatably arranged in the shell 1, and is connected to the power transmission component 4, the rotation of the telescopic component 3 can drive the rotation of the power transmission component 4, and the self-locking positioning piece 5 can position the telescopic component 3, specifically, the self-locking positioning piece 5 is rotatably arranged on the shell 1, and a self-locking positioning track 332 is provided on one side of the telescopic component 3, and the self-locking positioning piece 5 is used to position the rotation of the self-locking positioning track 332, specifically, according to the rotation angle of the telescopic component 3, the self-locking positioning piece 5 clamps the self-locking positioning track 332, so that the rotation of the telescopic component 3 is positioned by using the self-locking positioning piece 5, and the stretching length of the connecting line 2 is controlled for easy use.

[0040] On the basis of the first embodiment, in the second embodiment, more specifically, the self-locking positioning track 332 includes a plurality of outer rings 333, a plurality of middle rings 334, an inner ring 335 and a plurality of positioning blocks 336, and the number of the outer rings 333, the middle rings 334 and the positioning blocks 336 is the same;

[0041] When the connecting line 2 is pulled, the telescopic component 3 rotates, further driving the self-locking positioning track 332 to rotate. At this time, the positioning column 51 of the self-locking positioning member 5 slides from the inner ring 335 of the self-locking positioning track 332 to the outer ring 333 of the self-locking positioning track 332, slides to the middle ring 334 through the first sliding arc 351, and rotates in the outer ring 333 and the middle ring 334, thereby stretching the connecting line 2. When the pulling of the connecting line 2 is stopped, the connecting line 2 begins to telescope back under the action of the telescopic component 3, thereby driving the self-locking positioning track 332 to rotate in the opposite direction. At this time, the positioning column 51 will retreat from the middle ring 334 or the outer ring 333, and engage with the positioning block 336, so that the self-locking positioning track 332 stops rotating. The positioning column 51 adopts a circular arc-approximate triangular design to avoid the outer ring 333 and the middle ring 334 from rotating. When the connecting wire 2 is retracted under the action of the elastic member 32, the self-locking positioning member 5 slides from the positioning block 336 of the self-locking positioning track 332 to the inner ring 335. Under the action of the telescopic component 3, the connecting wire 2 begins to rapidly retract in the inner ring 335, thereby utilizing the cooperation of the outer ring 333, the middle ring 334, the inner ring 335, the positioning block 336 and the like to position the rotation of the self-locking positioning track 332, so that the retraction and extension of the connecting wire 2 are smoother.

[0042] On the basis of the second embodiment, in the third embodiment, more specifically, one side of the telescopic component 3 is provided with a side rail 35 matching the number of the outer ring 333, a middle rail 36 matching the number of the middle ring 334, a slide rail 37 and an inner rail 38 matching the number of the positioning blocks 336, the outer ring 333 is arranged between the side rail 35 and the slide rail 37, the middle ring 334 is arranged between the middle rail 36 and the slide rail 37, the inner ring 335 is arranged between the slide rail 37 and the inner rail 38, the positioning block 336 is arranged in the vertical middle of the side rail 35 and the inner rail 38, but not necessarily in the middle, and the positioning block 336 is arranged in the middle of the adjacent slide rail 37 in the horizontal direction, but not necessarily in the middle, the first sliding arc 351 is a circular arc line between the side rail 35 and the middle rail 36, the outer ring 33 3 and the middle ring 334 are connected through the first sliding arc 351, the inner rail 38 is provided with second sliding arcs 381 matching the number of the first sliding arcs 351, the second sliding arcs 381 are circular arc protrusions on the inner rail 38, the first sliding arc 351 and the second sliding arc 381 are respectively arranged at both ends of the positioning block 336; at the same time, a third sliding arc 337 and a fourth sliding arc 338 are provided on the positioning block 336, the third sliding arc 337 and the fourth sliding arc 338 are circular arc shapes, and the two circular arcs intersect to form a positioning bayonet 339, and the positioning bayonet 339 is used to be clamped with the positioning column 51 of the self-locking positioning member 5; inclined surfaces are provided on both sides of the middle rail 36, a telescopic channel is formed between one side and the positioning bayonet 339, and a stretching channel is formed between the other side and the third sliding arc 337;

[0043] When the connecting line 2 is pulled, the telescopic component 3 rotates, further driving the self-locking positioning track 332 to rotate. At this time, the positioning column 51 slides through the second sliding arc 381 in the inner ring 335, and slides along the stretching channel to the outer ring 333, slides in the outer ring 333, and then passes through the first sliding arc 351 to enter the middle ring 334, and then continuously slides along the middle ring 334 and the outer ring 333. When the pulling of the connecting line is stopped, the connecting line 2 begins to telescope back under the action of the telescopic component 3, thereby driving the self-locking positioning track 332 to rotate. At this time, the positioning column 51 will slide from the outer ring 333 or the middle ring 334 to the positioning bayonet 339 of the positioning block 336, so that the self-locking positioning track The track 332 stops rotating, and the length of the connecting line 2 does not change. As the number of the positioning blocks 336 increases, the length of the connecting line 2 that starts to be extended and retracted under the action of the elastic member 32 during positioning is shorter, and the positioning is more accurate. Preferably, the number of the positioning blocks 336 is 3. When the charging is completed and the connecting line 2 needs to be retracted, after slightly pulling the connecting line 2, the self-locking positioning member 5 slides from the telescopic channel at the positioning bayonet 339 of the self-locking positioning track 332 to the inner ring 335. Under the action of the telescopic assembly 3, the connecting line 2 begins to rapidly extend and retract in the inner ring 335. With the cooperation of the side rails 35, the middle rail 36, the slide rail 37 and the inner rail 38, the extension and positioning of the connecting line 2 are more streamlined, effectively reducing the failure rate of the equipment.

[0044] On the basis of Example 3, in Example 4, more specifically, a positioning column 51 is provided on the self-locking positioning member 5. The positioning column 51 is a triangle with an arc and is used to engage with the positioning bayonet 339. The positioning column 51 is slidably arranged in the self-locking positioning track 332. The positioning column 51 with an arc-shaped approximate triangle can slide smoothly in the self-locking positioning track 332 to prevent jamming, thereby improving the smoothness of the stretching or extension of the connecting line 2.

[0045] On the basis of the fourth embodiment, in the fifth embodiment, more specifically, the shell 1 includes a front shell 11 and a rear shell 12, the front shell 11 is connected to the rear shell 12, an axis 111 is provided on the front shell 11, and the telescopic assembly 3 is rotatably arranged on the axis 111. More specifically, the telescopic assembly 3 includes a first fixing member 31, an elastic member 32 and a second fixing member 33, and a storage bin 331 for placing the elastic member 32 is provided on one side of the second fixing member 33, and the storage bin 331 is used to place the elastic member 32, and the elastic member The spring 32 is a coil spring made of an elastic material. An opening 341 for installing the elastic member 32 is provided on the receiving chamber 331. One end of the elastic member 32 is provided on the outside of the receiving chamber 331, so that one end of the elastic member 32 is connected to the outside of the receiving chamber 331. In other embodiments, a second installation opening can be provided to clamp one end of the elastic member 32 with the second installation opening, and the other end passes through the opening 341 and is rolled in the receiving chamber 331. When the elastic member 32 is installed in the receiving chamber 331, 1, rotating the second fixing member 33 can make the elastic member 32 reel up, the first fixing member 31 is connected to the accommodating chamber 331, so that the elastic member 32 is fixedly installed in the accommodating chamber 331 to prevent the elastic member 32 from popping out during the process of reeling or releasing, the connecting line 2 is wound on the accommodating chamber 331, and the connecting line 2 is a transmission line used to charge the mobile smart device. One end of the connecting line 2 is connected to the power transmission component 4, and the other end is used to connect to the mobile smart device that needs to be charged, such as a mobile phone, a tablet, The connection line 2 can be connected to a laptop computer, and the storage bin 331 can be driven to rotate by pulling the connection line 2, thereby causing the elastic member 32 to reel in. When the connection line 2 is extended to the required length, it is locked for charging the mobile smart device. When the charging is completed, the connection line 2 is unlocked, and the elastic member 32 begins to release, thereby driving the storage bin 331 to rotate, and the connection line 2 wound on the storage bin 331 begins to reel in the storage bin 331, thereby ensuring that the connection line 2 can be retracted and extended, making it more convenient to use.

[0046] On the basis of the fifth embodiment, in the sixth embodiment, more specifically, the axis 111 is provided with a slot 112 for engaging with the elastic member 32, the first fixing member 31 and the second fixing member 33 are provided with mounting holes 34 corresponding to the axis 111, the mounting holes 34 of the first fixing member 31 and the second fixing member 33 are sleeved on the axis, and the accommodating chambers 331 of the first fixing member 31 and the second fixing member 33 are connected together, so that the elastic member 32 is more stable when rotating, and the elastic member 32 is provided with a mounting hole 34 corresponding to the axis 111. The card corresponding to the card slot 112 can be stuck in the card slot 112 of the axis 111. When the connecting line 2 is pulled, the accommodating compartment 331 is driven to rotate, and the card of the elastic member 32 is engaged with the card slot 112 of the axis 111, so that the elastic member 32 starts to reel around the axis 111, and an elastic force is generated during the reeling process. When the connecting line 2 is stretched to the required length, it is locked, so that the connecting line 2 is pulled to charge the mobile smart device when it is needed. When charging is completed, the lock is released and the connecting line 2 automatically starts to reel.

[0047] On the basis of the sixth embodiment, in the seventh embodiment, more specifically, the power transmission component 4 includes a movable plate 41 and a fixed plate 42, the movable plate 41 is connected to the second fixing member 33, and can rotate with the rotation of the second fixing member 33, the fixed plate 42 is connected to the rear shell 12, the movable plate 41 and the fixed plate 42 are abutted together, and with the rotation of the movable plate 41, the connection between the movable plate 41 and the fixed plate 42 is always stable.

[0048] On the basis of the seventh embodiment, in the eighth embodiment, more specifically, the movable plate 41 includes a plurality of connectors 411, a connecting plate 412 and a welding disk 413. Preferably, the number of the connectors 411 is 3, which are arranged on the connecting plate 411 in an approximately triangular shape, and the connectors 411 are connected in parallel with each other, and each of the connectors 411 can be rotatably contacted with the fixed plate 42. In this case, the connector 411 can also be in more stable contact with the fixed plate 42 under high-speed rotation, so that the operation of the power transmission component 4 is more stable, and the welding disk 413 is connected in series with the connector 411, one end of the connecting line 2 is connected to the welding disk 413, and the other end is connected to the smart mobile device that needs to be charged, so that the connection between the connecting line 2 and the power transmission component 4 is realized under the action of the connector 411, the connecting plate 412 and the welding disk 413 in the rotating state, thereby realizing the retractable function of the connecting line 2.

[0049] On the basis of the eighth embodiment, in the ninth embodiment, more specifically, the connector 411 includes an insulating material 414 and a plurality of conductive contacts 415, the conductive contacts 415 are connected to the insulating material 414, the insulating material 414 is used to fix the position of the conductive contacts 415 and prevent the conductive contacts 415 from short-circuiting, the conductive contacts 415 are rotatably in contact with the fixed plate 42, and the conductive contacts 415 are in contact with the fixed plate 42, so that the operation of the power transmission component 4 is more stable;

[0050] More specifically, the conductive contact 415 includes at least one positive contact 416, at least one negative contact 417 and at least one signal transmission contact 418. Preferably, the number of the conductive contacts 415 is 7, of which 2 are the positive contacts 416, 2 are the negative contacts 417, and the other 3 are the signal transmission contacts 418 for transmitting fast charging signals. The positive contacts 416 of the conductive contacts 415 are connected in parallel with each other, and the negative contacts 417 of the conductive contacts 415 are connected in parallel with each other; the signal transmission contacts 418 of the conductive contacts 415 are connected in parallel with each other, even if any one of the positive contacts 416, the negative contact 417 or the signal transmission contact 418 is damaged, it will not affect the normal operation of the connector 411, thereby increasing the reliability of the device;

[0051] More specifically, the positive contact 416, the negative contact 417 and the signal transmission contact 418 are all made of metal sheets, preferably copper sheets. The signal transmission contact 418 includes a first part 419 and a second part 420. The width of the first part 419 is wider than that of the second part 420. The first part 419 ensures the strength of the signal transmission contact 418. The second part 420 is used to abut against the fixed plate 42. The width of the second part 420 is smaller than that of the second part 419. When abutting against the fixed plate 42, the pressure is greater, the abutment is tighter, and the signal transmission is more stable.

[0052] On the basis of the ninth embodiment, in the tenth embodiment, more specifically, the fixed plate 42 is connected to the rear shell 12, and an input terminal 421 for connecting to an external power supply and a conductive plate 422 for connecting to the connector 411 are provided on the fixed plate 42. The connectors 411 are connected in parallel with each other, and damage to any one of the connectors 411 does not affect normal operation. During use, the input terminal 421 is connected to an external power supply, and current enters the conductive plate 422 of the fixed plate 42 from the input terminal 421. The conductive plate 422 is provided with a plurality of annular conductive Track 423, the conductive contact 415 can be rotatably abutted on the annular conductive track 423, and then the current is transmitted to the conductive contact 415, and then the current is transmitted to the welding disk 413 connected in series with the connector 411, and one end of the connecting line 2 is connected to the welding disk 413, thereby completing the entire current transmission process. Through the design of the moving plate 41 and the fixed plate 42, the external power supply can be stably transmitted to the connecting line 2 when the moving plate 41 rotates at a high speed, so as to charge the mobile smart device.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for a retractable mechanism, characterized in that: The invention comprises a housing (1), a connecting wire (2), a telescopic component (3), a power transmission component (4) and a self-locking positioning member (5), wherein the connecting wire (2) is wound around the telescopic component (3), and the telescopic component (3) is rotatably arranged in the housing (1) and connected to the power transmission component (4); The self-locking positioning member (5) is rotatably arranged on the housing (1); a self-locking positioning track (332) is provided on one side of the telescopic assembly (3); and the self-locking positioning member (5) is used to position the rotation of the self-locking positioning track (332).

2. A positioning device for a retractable mechanism according to claim 1, characterized in that: The self-locking positioning track (332) comprises a plurality of outer rings (333), a plurality of middle rings (334), an inner ring (335) and a plurality of positioning blocks (336), wherein the outer ring (333) and the middle ring (334) are connected; When the connecting line (2) is just pulled and the self-locking positioning track (332) rotates, the self-locking positioning member (5) slides from the inner ring (335) of the self-locking positioning track (332) to the outer ring (333), and slides between the outer ring (333) and the middle ring (334); When the pulling of the connecting line (2) stops, under the action of the elastic member (32), the self-locking positioning track (332) rotates in the opposite direction, and the self-locking positioning member (5) is locked in the positioning block (336) of the self-locking positioning track (332); When the connecting line (2) is slightly pulled again, the self-locking positioning member (5) slides from the positioning block (336) of the self-locking positioning track (332) to the inner ring (335), and slides in the inner ring (335).

3. A positioning device for a retractable mechanism according to claim 2, characterized in that: One side of the telescopic component (3) is provided with side rails (35) whose number matches that of the outer ring (333), middle rails (36) whose number matches that of the middle ring (334), slide rails (37) and inner rails (38) whose number matches that of the positioning blocks (336); the side rails (35) are connected to the middle rail (36); the outer ring (333) is arranged between the side rails (35) and the slide rails (37); the middle ring (334) is arranged between the middle rail (36) and the slide rails (37); the inner ring (335) is arranged between the slide rails (37) and the inner rails (38); the positioning blocks (336) are arranged between the side rails (35) and the inner rails (38), and between adjacent slide rails (37); The side rail (35) is provided with first sliding arcs (351) whose number matches the number of the positioning blocks (336); the side rail (35) is connected to the middle rail (36) through the first sliding arcs (351); the inner rail (38) is provided with second sliding arcs (381) whose number matches the number of the first sliding arcs (351); the first sliding arc (351) and the second sliding arc (381) are respectively provided at two ends of the positioning block (336); The positioning block (336) is provided with a third sliding arc (337) and a fourth sliding arc (338), a positioning bayonet (339) is provided between the third sliding arc (337) and the fourth sliding arc (338), and the positioning bayonet (339) is a circular arc intersecting up and down and used for engaging with the self-locking positioning member (5); Inclined surfaces are provided on both sides of the slide rail (37); one side of the slide rail (37) corresponds to the positioning bayonet (339), and the other side corresponds to the third sliding arc (337).

4. A positioning device for a retractable mechanism according to claim 3, characterized in that: The self-locking positioning member (5) is provided with a positioning column (51), which is approximately triangular with an arc. The positioning column (51) is slidably arranged in the self-locking positioning track (332) and is used to be engaged with the positioning bayonet (339).

5. A positioning device for a retractable mechanism according to claim 1, characterized in that: The housing (1) comprises a front housing (11) and a rear housing (12); the front housing (11) is connected to the rear housing (12); an axis (111) is provided on the front housing (11); and the telescopic assembly (3) is rotatably arranged on the axis (111); The telescopic component (3) comprises a first fixing member (31), an elastic member (32) and a second fixing member (33); a storage compartment (331) for accommodating the elastic member (32) is provided on one side of the second fixing member (33); the connecting wire (2) is wound around the storage compartment (331) and one end of the connecting wire is connected to the power transmission component (4); The accommodating bin (331) is provided with an opening (341); one end of the elastic member (32) is arranged outside the accommodating bin (331), and the other end is rolled into the accommodating bin (331) through the opening (341).

6. A positioning device for a retractable mechanism according to claim 5, characterized in that: The first fixing member (31) and the second fixing member (33) are provided with mounting holes (34) corresponding to the axis (111); the first fixing member (31) and the second fixing member (33) are sleeved on the axis (111) through the mounting holes (34); and the first fixing member (31) is connected to the accommodating bin (331); The axis (111) is provided with a slot (112) for engaging with the elastic member (32), the elastic member (32) is provided with a card corresponding to the slot (112), and the slot (112) of the axis (111) is engaged with the card of the elastic member (32).

7. A positioning device for a retractable mechanism according to claim 6, characterized in that: The power transmission component (4) comprises a movable plate (41) and a fixed plate (42); the movable plate (41) is connected to the second fixed member (33) and is rotatably in contact with the fixed plate (42).

8. A positioning device for a retractable mechanism according to claim 7, characterized in that: The movable plate (41) comprises a plurality of connectors (411), a connecting plate (412) and a welding plate (413), each of the connectors (411) being distributed on the connecting plate (412) in parallel with each other, and each of the connectors (411) being rotatable to contact the fixed plate (42); The welding pad (413) is connected in series with the connector (411), and one end of the connecting line (2) is connected to the welding pad (413).

9. A positioning device for a retractable mechanism according to claim 8, characterized in that: The connector (411) comprises an insulating material (414) and a plurality of conductive contacts (415), wherein the conductive contacts (415) are connected to the insulating material (414), and the conductive contacts (415) are rotatably in contact with the fixed plate (42).

10. A positioning device for a retractable mechanism according to claim 9, characterized in that: The fixed plate (42) is connected to the rear shell (12), and is provided with an input terminal (421) for connecting to an external power source and a conductive plate (422) for connecting to the connector (411). The conductive plate (422) is provided with a plurality of annular conductive tracks (416), and the conductive contact (415) can rotatably abut against the annular conductive tracks (416).

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