Retractable device and portable charging station

Abstract

The present invention provides a retractable device and a portable charging pile, including a fixed section and a telescopic section that is sleeved and connected to the fixed section in a step-by-step manner along the telescopic direction. The head of the telescopic section is provided with a deformable body, and the deformable body includes a deformable part and a first side surface that fits with the fixed section or the adjacent upper-level telescopic section. The first side surface is provided with a boss with an arc surface at the top, and the side surface of the boss away from the head of the telescopic section is perpendicular to the first side surface or forms an acute angle with the extension direction; the fixed section includes a third side surface that fits with the boss of the telescopic section, and the head of the fixed section is provided with a first positioning groove, and the first positioning groove includes a first slope surface that forms an acute angle with the extension direction. The retractable device provided by the present invention has high positioning stability, is convenient to retract, and occupies little space; the portable charging pile provided by the present invention is convenient to fix, has high stability, is not easy to fall, and is easy to remove; the design requirements and production costs of the charging box body are reduced and it is easier to process.

Description

Technical Field

[0001] The present invention relates to the technical field of fixing a portable charging pile, and in particular to a retractable device and a portable charging pile. Background Art

[0002] In recent years, electric vehicles have been widely used and produced due to their smaller impact on the environment compared to traditional vehicles. Electric vehicles use batteries to store electrical energy to drive them, and charging piles are a type of charging equipment that is specifically used to charge the batteries of electric vehicles. During the use of existing portable charging piles, the charging box body is generally easy to fall to the ground or be placed directly on the ground. During use, if it needs to be placed on the ground, it must be tested to verify that the product meets the industry's anti-crushing performance test standards. If the charging box body is designed to meet the anti-crushing standards, it will greatly increase the production and testing costs of the portable charging pile.

[0003] Therefore, there is an urgent need for a fixing method to prevent the charging box body from being placed on the ground. Summary of the invention

[0004] In view of the above problems, the present invention proposes a retractable device that occupies a small space, is easy to retract and has high positioning stability in the retracted state, and a portable charging pile that includes a retractable device to facilitate fixing the charging box body and avoid being placed on the ground for use, so as to improve the above problems.

[0005] In the first aspect, the present invention provides a telescopic device, comprising a fixed section and a telescopic section which is connected to the fixed section in a step-by-step manner along the telescopic direction of the telescopic device, wherein the telescopic direction comprises an extension direction and a contraction direction, and the telescopic section can slide along the telescopic direction between the head and the tail of the fixed section or an adjacent upper-level telescopic section; a deformation body is provided at the head of the telescopic section, and the deformation body comprises a deformation part and a first side surface which fits with the fixed section or the adjacent upper-level telescopic section, the first side surface is provided with a boss with an arc surface at the top, the side surface of the boss which is away from the head of the telescopic section is the second side surface, the second side surface is perpendicular to the first side surface or forms an acute angle with the extension direction; the fixed section comprises a third side surface which fits with the boss of the telescopic section, and a first positioning groove is provided on the third side surface at the head position of the fixed section, and the first positioning groove comprises a first slope surface which forms an acute angle with the extension direction.

[0006] More preferably, a first limit platform is provided at the tail of the fixed joint, and the side of the first limit platform close to the boss of the adjacent telescopic joint is a fourth side surface, and the fourth side surface is perpendicular to the third side surface or forms an acute angle with the contraction direction.

[0007] More preferably, the telescopic joint comprises a tail telescopic joint.

[0008] More preferably, the telescopic joint also includes at least one middle telescopic joint, the deformation body of the middle telescopic joint also includes a fifth side surface opposite to the first side surface, and a second positioning groove for positioning the deformation body of the next-level telescopic joint is opened at the head position of the middle telescopic joint, and the second positioning groove is located on the fifth side surface, and the second positioning groove includes a second slope surface that is an acute angle with the extension direction.

[0009] More preferably, a second limit platform is provided at the tail position of the middle telescopic joint, and the second limit platform includes a sixth side surface, and the sixth side surface is perpendicular to the fifth side surface or forms an acute angle with the contraction direction.

[0010] More preferably, the height of the boss of the telescopic joint is greater than the height of its adjacent first limit platform or greater than the height of its adjacent second limit platform of the previous telescopic joint, and is less than or equal to the sum of the depth of its adjacent first positioning groove and the height of its adjacent first limit platform or is less than or equal to the sum of the depth of its adjacent second positioning groove and the height of its adjacent second limit platform.

[0011] More preferably, the cross sections of the fixed section, the middle telescopic section, and the tail telescopic section perpendicular to the telescopic direction are similar polygons.

[0012] More preferably, a notch is formed at the head of a corresponding face of one side of the polygon.

[0013] More preferably, two or more gaps are provided at intervals, and a deformation body is formed between two adjacent gaps.

[0014] More preferably, the polygon is a quadrilateral.

[0015] More preferably, the sizes of the fixed section, the middle telescopic section, and the tail telescopic section decrease sequentially.

[0016] In a second aspect, the present invention provides a portable charging pile, wherein the above-mentioned retractable device is fixed on the charging box body of the portable charging pile, the fixed section includes a fixed portion fixedly connected to the charging box body and the retractable device, and the tail end of the retractable section farthest from the fixed section is fixedly connected to a limited base.

[0017] More preferably, the fixing portion extends from the head of the fixing section toward a direction perpendicular to the telescopic direction.

[0018] More preferably, the fixing portion is fixed to the back side of the charging box body.

[0019] More preferably, the limiting base is in the shape of an isosceles trapezoid.

[0020] The technical effect of the present invention is to provide a retractable device and a portable charging pile. Due to the cooperation between the boss structure and the first positioning groove or the second positioning groove and the damping effect during extension and extension, the retractable device has high positioning stability in the extended state; it is convenient to extend and retract and occupies little space; the portable charging pile including the retractable device is used to conveniently fix the charging box body of the portable charging pile, and the charging box body has high fixing stability, is not easy to fall and is easy to remove; on the other hand, it is fixed to the wheel hub of the electric vehicle so that the charging box body does not need to be placed on the ground for use, thereby reducing the design requirements of the charging box body, low cost and easier processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the retractable device in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 Cross-sectional view along AA direction;

[0023] Figure 3 It is a schematic diagram of the structure of a fixed joint in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the structure of the middle telescopic joint in one embodiment of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the middle telescopic joint from another perspective in one embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the tail telescopic joint in one embodiment of the present invention;

[0027] Figure 7 It is a structural schematic diagram of a retractable device and a limiting base in an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the structure of a portable charging pile in one embodiment of the present invention;

[0029] Fig. 9 This is a schematic diagram of the structure of the charging box in an embodiment of the present invention;

[0030] Fig.10 This is a schematic diagram of the effect of fixing the charging box body on the wheel hub in an embodiment of the present invention;

[0031] Fig.11 This is a schematic diagram of the effect of fixing the charging box body on the wheel hub from another perspective in an embodiment of the present invention.

[0032] Description of reference numerals:

[0033] Retractable device 100 Fixed section 10 The third side 11 First positioning groove 12 First slope 121 The first limiter 13 Fourth side 131 Fixing portion 14 Expansion joint 20 Gap 21 Deformation 22 Deformation part 221 First side 222 Boss 223 Second side 2231 Fifth side 224 Second positioning groove 23 Second slope 231 The second limiter 24 Sixth side 241 Middle expansion joint 201 Tail expansion joint 202 Limit base 30 Portable charging station 400 Power supply assembly 41 First cable 42 Charging box body 43 Charging box body 431 Second cable 44 Charging gun 45 Wheel 50 DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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.

[0035] The present invention provides a retractable device 100. Figure 1-7 As shown, the telescopic device 100 includes a fixed section 10 and a telescopic section 20 .

[0036] The telescopic joints 20 and the fixed joints 10 and the telescopic joints 20 are connected step by step along the telescopic direction c of the telescopic device 100. The telescopic direction c includes an extension direction c1 and a contraction direction c2. Figure 2 As shown, the telescopic section 20 can slide back and forth along the telescopic direction c between the fixed section 10 or the head to the tail of the adjacent upper-level telescopic section.

[0037] Specifically, the telescopic joint 20 includes a tail telescopic joint 202, or includes a tail telescopic joint 202 and at least one middle telescopic joint 201. In one embodiment, the telescopic joint 20 is a tail telescopic joint 202, and the fixed joint 10 is directly sleeved on the tail telescopic joint 202; in another embodiment, the telescopic joint 20 includes a middle telescopic joint 201 and a tail telescopic joint 202, the fixed joint 10 is sleeved on the outside of the middle telescopic joint 201 and connected to the middle telescopic joint 201, and the middle telescopic joint 201 is sleeved on the outside of the tail telescopic joint 202 and connected to the tail telescopic joint 202; in other embodiments, the telescopic joint 20 includes multiple middle telescopic joints 201 and a tail telescopic joint 202. The cross-sections of the fixed section 10, the middle telescopic section 201, and the tail telescopic section 202 along the direction perpendicular to the telescopic direction are similar polygons, and the sizes of the fixed section 10, the middle telescopic section 201, and the tail telescopic section 202 decrease successively. In one embodiment, the cross-sectional polygon is a quadrilateral, specifically an isosceles trapezoid.

[0038] like Figure 1-3As shown, the fixed joint 10 includes a third side surface 11, a fourth side surface 131, a first positioning groove 12, a first limiting platform 13 and a fixing portion 14. In one embodiment, the third side surface 11 is fitted with the boss 223 of the adjacent middle telescopic joint 201, the first positioning groove 12 is arranged at the head position of the fixed joint 10 and is located on the third side surface 11, and the first positioning groove 12 includes a first slope 121 that is at an acute angle to the extension direction c1. Preferably, the first slope 121 is a plane or a concave surface. In one embodiment, the acute angle between the first slope 121 and the extension direction c1 is less than 45°, so that the boss 223 of the adjacent telescopic joint can slide out of the first positioning groove 12. The first limiting platform 13 on the fixed section 10 is arranged at the tail position of the fixed section 10, and has a limiting effect on the boss 223 of the adjacent telescopic section. The side of the first limiting platform 13 close to the boss 223 of the adjacent telescopic section 20 is the fourth side 131. In one embodiment, the adjacent telescopic section 20 of the fixed section 10 is the middle telescopic section 201, and the fourth side 131 of the fixed section 10 is perpendicular to the third side 11 thereof or forms an acute angle with the contraction direction c2. Figure 4-5 The second side surface 2231 of the middle telescopic section 201 shown is arranged perpendicular to the first side surface 222, which can enhance the limiting effect of the first limiting platform 13 of the fixed section 10 on the boss 223 of the middle telescopic section 201, and improve the reliability of the telescopic device 100. In another embodiment, the fourth side surface 131 is perpendicular to the third side surface 11. The head of the fixed section 10 extends with a fixing portion 14 in a direction perpendicular to the telescopic direction c. In one embodiment, the fixing portion 14 is integrally formed with the fixed section 10. In another embodiment, the next-level telescopic section of the fixed section 10 is the middle telescopic section 201, and the next-level telescopic section of the middle telescopic section 201 is the tail telescopic section 202.

[0039] like Figure 1-6 As shown, the telescopic section 20 of the telescopic device 100 can be extended along the extension direction c1, and can also be retracted along the retracting direction c2, so that the telescopic device 100 can reduce space occupation when not in use and is easy to store. The extension direction c1 and the retracting direction c2 are as shown in FIG. Figure 2 In one embodiment, the telescopic section 20 includes a rear telescopic section 202 sleeved on the fixed section 10 . In another embodiment, the telescopic section 20 includes a rear telescopic section 202 and at least one middle telescopic section 201 sleeved between the fixed section 10 and the rear telescopic section 202 .

[0040] Specifically, a deformation body 22 is provided at the head of the telescopic joint 20. In one embodiment, a notch 21 is provided on one surface of the telescopic joint 20 and the notch 21 is provided at the head of the telescopic joint 20; in another embodiment, two notches 21 are provided on one surface of the telescopic joint at intervals, and the notches 21 are provided on two opposite surfaces of the telescopic joint 20. In one embodiment, the cross-sections of the fixed joint 10 and the telescopic joint 20 are isosceles trapezoids, and the notches 21 are provided on two surfaces corresponding to two parallel sides in the cross-section isosceles trapezoid, and three notches 21 are provided on each surface. A deformation body 22 is formed between two adjacent notches 21, and the deformation body 22 includes a deformation part 221 and a first side surface 222 that fits the fixed joint 10 or the adjacent upper-level telescopic joint. The first side surface 222 is provided with a boss 223 with an arc surface at the top, and the side of the boss 223 away from the head side of the telescopic joint 20 is a second side surface 2231, and the second side surface 2231 is perpendicular to the first side surface 222 or forms an acute angle with the stretching direction c1. In one embodiment, the second side surface 2231 is perpendicular to the first side surface 222. In one embodiment, the height of the boss 223 of the middle telescopic joint 201 adjacent to the fixed joint is equal to the sum of the depth of the first positioning groove 12 and the height of the first limit platform 13, ensuring that when the boss 223 of the deformation body 22 of the middle telescopic joint is in the first positioning groove 12, the deformation body 22 is in a natural non-deformed state; in another embodiment, the height of the boss 223 of the tail telescopic joint 202 adjacent to the middle telescopic joint 201 is equal to the sum of the depth of the second positioning groove 23 of the middle telescopic joint 201 and the height of the second limit platform 24.

[0041] When subjected to external force, when the boss 223 of the deformation body 22 of the telescopic joint 20 slides out of the corresponding positioning groove along the first slope 121 of the first positioning groove 12 of the fixed joint 10 or the second slope 231 of the second positioning groove 23 of the previous telescopic joint, the deformation body 22 is in a deformed state, and there is a damping effect between the boss 223 of the deformation body 22 and the third side surface 11 of the fixed joint 10 or the fifth side surface 224 of the previous telescopic joint, thereby generating friction. When the external force is removed, the boss 223 of the telescopic joint 20 can be fixed on the third side surface 11 corresponding to the fixed joint 10 or the fifth side surface 224 corresponding to the previous telescopic joint 20, so that the telescopic device 100 can be extended to a specific length.

[0042] like Figure 4-5 As shown, the middle telescopic joint 201 includes a first side surface 222 , a second side surface 2231 , a fifth side surface 224 , a sixth side surface 241 , a second positioning groove 23 , a second slope surface 231 , and a second limiting platform 24 .

[0043] The deformation body 22 of the middle telescopic joint 201 also includes a fifth side surface 224 opposite to the first side surface 222 of the middle telescopic joint 201, and the fifth side surface 224 of the middle telescopic joint 201 fits with the boss 223 of the next-stage telescopic joint 202. A second positioning groove 23 for positioning the boss 223 of the tail telescopic joint 202 or the next-stage middle telescopic joint is provided at the head of the middle telescopic joint 201, and the second positioning groove 23 is provided on one side of the fifth side surface 224. The second positioning groove 23 of the middle telescopic joint 201 is used to position the boss 223 of the tail telescopic joint 202 or the boss 223 of the next-stage middle telescopic joint in the contracted state.

[0044] The tail position of the middle telescopic joint 201 is provided with a second limiting platform 24 which limits the boss 223 of the middle telescopic joint of the next stage or the tail telescopic joint 202 in the extended state. The second limiting platform 24 includes a sixth side 241 which is perpendicular to the fifth side 224 or forms an acute angle with the contraction direction c2. The sixth side 241 is the side of the second limiting platform 24 which is close to the boss 223 of the tail telescopic joint 202. In one embodiment, the sixth side 241 of the middle telescopic joint 201 is perpendicular to the fifth side 224, and combined with the second side 2231 of the tail telescopic joint 202 being perpendicular to its first side 222 or the middle telescopic joint of the next stage, it can better limit the boss 223 of the tail telescopic joint 202 or the boss 223 of the middle telescopic joint of the next stage.

[0045] The tail telescopic joint 202 includes a first side surface 222, a second side surface 2231, a boss 223 and a deformation body 22. In one embodiment, the first side surface 222 of the tail telescopic joint 202 is perpendicular to the second side surface 2231, and cooperates with the arrangement of the sixth side surface 241 of the adjacent middle telescopic joint 201 being perpendicular to its fifth side surface 224, so as to better limit the boss 223 of the tail telescopic joint 202. The boss 223 of the tail telescopic joint 202 can be positioned in the second positioning groove 23 of the adjacent middle telescopic joint 201.

[0046] The telescopic principle of the telescopic device 100 is as follows:

[0047] When the telescopic device 100 is in the contracted state, the boss 223 of the telescopic section 20 is placed in the first positioning groove 12 of the adjacent fixed section 10 or in the second positioning groove 23 of the adjacent upper telescopic section, which can fix the boss 223 to prevent the telescopic section from moving or shaking at will. When an external force is applied along the extension direction c1, the telescopic section 20 can slide from the head of the fixed section 10 or the adjacent upper telescopic section to the tail along the extension direction c1 until the second side surface 2231 on the boss 223 of the telescopic section 20 abuts against the fourth side surface 131 of the adjacent fixed section 10 or the sixth side surface 241 of the adjacent upper telescopic section, which can prevent the sections from being disjointed when moving to the tail end.

[0048] When the telescopic device 100 is in the extended state, if subjected to external force, the telescopic section 20 can slide from the tail of the fixed section 10 or the adjacent upper-level telescopic section to the head along the contraction direction c2 and return to the contraction state until the boss 223 of the telescopic section 20 is pushed back into the first positioning groove 12 of the fixed section 10 or the second positioning groove 23 of the adjacent upper-level telescopic section. When moving from the contraction state to the extended state, the boss 223 of the telescopic section 20 uses the arc surface at the top thereof to slide out in the extension direction c1 along the first slope 121 of the first positioning groove 12 of the fixed section 10 or the second slope 231 of the second positioning groove 23 of the upper-level telescopic section 20, and the deformation portion 221 is deformed, thereby generating a damping effect.

[0049] When the boss 223 moves to the middle state, the external force is removed. Due to the damping effect, the friction force generated by the top of the boss 223 of the telescopic joint 20 and the third side surface 11 of the fixed joint 10 or the fifth side surface 224 of the previous telescopic joint can fix the telescopic joint 20 in this position, so that the telescopic device 100 can be extended to a specific length.

[0050] In one embodiment, the telescopic device 100 includes a fixed section 10, a middle telescopic section 201, and a tail telescopic section 202. When an external force is applied along the extension direction c1, the middle telescopic section 201 can slide from the head of the fixed section 10 to the tail along the extension direction c1, and the tail telescopic section 202 can slide from the head of the middle telescopic section 201 to the tail along the extension direction c1, wherein the middle telescopic section 201 is the upper-level telescopic section of the tail telescopic section 202, and the tail telescopic section 202 is the lower-level telescopic section of the middle telescopic section 201, and the side of the fixed section 10 and the telescopic section 20 close to the fixed portion 14 is the head, and the side away from the fixed portion 14 is the tail.

[0051] The present invention also provides a portable charging station 400, such as Figure 8-11 As shown, the portable charging pile 400 includes a power supply component 41, a first cable 42, a charging box 43, a second cable 44 and a charging gun 45. The power supply component 41 and the charging box 43 are connected through the first cable 42, and the charging box 43 and the charging gun 45 are connected through the second cable 44. Figure 8-9 In one embodiment, the tail end of the tail telescopic joint 202 is fixedly connected to the limiting base 30, and the tail telescopic joint 202 and the limiting base 30 are fixed together by locking screws, such as Figure 7As shown. In another embodiment, the limiting base 30 is an isosceles trapezoid. The charging box 43 includes a charging box body 431 and the retractable device 100 connected to the limiting base 30. The fixed section 10 of the retractable device 100 includes a fixed portion 14 fixedly connected to the charging box body 431 and the retractable device 100. The fixed portion 14 extends from the head of the fixed section 10 in a direction perpendicular to the telescopic direction c. In one embodiment, the fixed portion 14 is fixed to the back of the charging box body 43 by means of locking screws.

[0052] like Figure 9-11 As shown, the limiting base 30 facilitates fixing the charging box 43 on the wheel hub 50 or other holes when the portable charging pile 400 is in use, so that the charging box 43 is free from being placed on the ground, thereby reducing the design requirements and production inspection requirements of the charging box 43, reducing production costs and making it easier to process.

[0053] The retractable device 100 is extended to a specific length through the telescopic joint 20. Since the size of the hole on the wheel hub 50 gradually increases from the direction close to the center of the wheel hub to the direction away from the center of the wheel hub, the size of the limit base 30 is set to be larger than the size of the hole close to the center of the wheel hub, and smaller than the size of the hole away from the center of the wheel hub. The limit base 30 is inserted through the large-sized hole of the wheel hub 50 away from the center of the wheel hub, and slid toward the center of the wheel hub 50 until the limit base 30 cannot be taken out horizontally from the hole of the wheel hub 50. Then, the charging box body 431 can be fixed on the wheel hub 50, so that when the portable charging pile 400 is in use, the charging box 43 does not need to be placed on the ground. The fixing effect of the charging box body 413 and the wheel hub 50 through the retractable device 100 is as shown in FIG. Figure 10-11 The charging box 43 of the portable charging pile 400 provided by the present invention can also fix the charging box body 431 in other holes.

[0054] In summary, the present invention provides a retractable device and a portable charging pile including the retractable device. The retractable device provided by the present invention has high positioning stability in the retracted state due to the cooperation between the boss structure and the first positioning groove or the second positioning groove and the damping effect during retraction; the retractable device is convenient to retract and occupies a small space; due to the setting of the first limit platform and the second limit platform, it can prevent the sections from being disjointed when they move to the tail end, and it is more convenient to use. The portable charging pile including the retractable device provided by the present invention can fix the charging box body on the wheel hub when the portable charging pile is used, and avoid placing the charging box body on the ground. Then, the charging box body does not need to consider the anti-crushing requirements in product design and material selection, and the portable charging pile does not need to be tested for anti-crushing performance after production, which reduces product design requirements, thereby reducing costs and making it easier to process; the retractable device is convenient to retract, and when the charging box body of the portable charging pile is fixed on the wheel hub of the electric vehicle, the positioning stability in the retracted state is high and the fixing method of the charging box body on the wheel hub is convenient, and the charging box body is fixed on the wheel hub with high stability, is not easy to fall, and is easy to remove.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not drive the essence of the corresponding technical solutions away from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A retractable device, characterized in that: It includes a fixed section and a telescopic section which is sleeved and connected with the fixed section step by step along the telescopic direction of the telescopic device, wherein the telescopic direction includes an extension direction and a contraction direction, and the telescopic section can slide along the telescopic direction between the head and tail of the fixed section or the adjacent upper telescopic section; The head of the telescopic joint is provided with a deformable body, and the deformable body includes a deformable part and a first side surface that fits with the fixed joint or the adjacent upper-level telescopic joint, the first side surface is provided with a boss with an arc surface at the top, and the side surface of the boss away from the head of the telescopic joint is the second side surface, and the second side surface is perpendicular to the first side surface or forms an acute angle with the extension direction; The fixed joint includes a third side surface that fits with the boss of the telescopic joint, and a first positioning groove is provided on the third side surface at the head position of the fixed joint, and the first positioning groove includes a first slope surface that is at an acute angle to the extension direction; A first limiting platform is provided at the tail of the fixed joint, and a side surface of the first limiting platform close to a side of a boss of an adjacent telescopic joint is a fourth side surface, and the fourth side surface is perpendicular to the third side surface or forms an acute angle with the contraction direction; The telescopic joint includes a tail telescopic joint; The telescopic section further comprises at least one middle telescopic section, the deformation body of the middle telescopic section further comprises a fifth side surface opposite to the first side surface, a second positioning groove for positioning the deformation body of the next-level telescopic section is provided at the head position of the middle telescopic section, the second positioning groove is located on the fifth side surface, and the second positioning groove comprises a second slope surface which is at an acute angle to the extension direction; A second limit platform is provided at the tail of the middle telescopic joint, and the second limit platform includes a sixth side surface, and the sixth side surface is perpendicular to the fifth side surface or forms an acute angle with the contraction direction; The cross sections of the fixed section, the middle telescopic section, and the tail telescopic section perpendicular to the telescopic direction are similar polygons; A notch is formed at the head of a corresponding face of one side of the polygon; There are two or more gaps spaced apart from each other, and a deformation body is formed between two adjacent gaps.

2. The retractable device according to claim 1, characterized in that: The height of the boss of the telescopic joint is greater than the height of the adjacent first limit platform or greater than the height of the adjacent second limit platform of the previous telescopic joint, and is less than or equal to the sum of the depth of the adjacent first positioning groove and the height of the adjacent first limit platform or is less than or equal to the sum of the depth of the adjacent second positioning groove and the height of the adjacent second limit platform.

3. The retractable device according to claim 1, characterized in that: The polygon is a quadrilateral.

4. The retractable device according to claim 1, characterized in that: The sizes of the fixed section, the middle telescopic section, and the tail telescopic section decrease in sequence.

5. A portable charging station, characterized in that: The retractable device according to any one of claims 1 to 4 is fixed on the charging box body of the portable charging pile, and the fixed section includes a fixed portion fixedly connected to the charging box body and the retractable device, and the tail end of the retractable section farthest from the fixed section is fixedly connected to a limited base.

6. The portable charging station according to claim 5, characterized in that: The fixing portion extends from the head of the fixing section toward a direction perpendicular to the telescopic direction.

7. The portable charging station according to claim 5, characterized in that: The fixing portion is fixed to the back side of the charging box body.

8. The portable charging station according to claim 5, characterized in that: The limiting base is in the shape of an isosceles trapezoid.

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