Charging pile capable of automatically winding and unwinding charging gun cable and control method

Abstract

The invention discloses a charging pile capable of automatically winding and unwinding a charging gun cable. The charging pile comprises a charging pile body, a charging gun, a charging cable and a spring take-up device. The spring take-up device is arranged in the charging pile body; the tail end of a charging cable led out of the spring take-up device is connected with a charging gun. A spring torque unit and a reel used for winding wires are arranged in the spring take-up device, and the spring torque unit applies elastic rotating torque to the reel, so that the reel can perform winding action spontaneously; a limiting platform is arranged on the charging pile body, a cable penetrating-out opening is formed in the limiting platform in a hollowed-out mode, and a charging cable in the charging pile body penetrates out outwards through the cable penetrating-out opening. The purposes of constant-force pulling, safety, springback prevention and stable hovering at any time are achieved.

Description

Technical Field

[0001] This invention belongs to the field of charging piles. Background Technology

[0002] The management of charging cables for electric vehicle charging stations mainly involves the following methods:

[0003] Manual coiling: After using and returning the charging gun, users need to manually coil the cable onto the charging station hook or tray. This method is cumbersome, the cable is prone to dragging and wearing down, and it is not neat, resulting in a poor user experience.

[0004] Simple spring retractor type: A spring retractor is integrated into the pile body, using spring force to automatically retract the cable. While this method achieves automatic cable retraction, it has significant drawbacks:

[0005] Poor pulling experience: When users pull out the cable, the spring pull force that needs to be overcome increases linearly or non-linearly with the length of the cable pulled out, making it more and more difficult to pull out the cable, resulting in a poor user experience.

[0006] Safety hazard: If the cable is suddenly released during the pulling process, it will rebound rapidly under the force of the spring, which may hit people or objects, posing a safety risk and causing impact damage to the cable and the cable reel itself.

[0007] Unable to be secured midway: Simple spring retractors cannot keep the cable stable at any length after it has been pulled out, requiring additional clips or continuous force from the user to maintain it. Summary of the Invention

[0008] Purpose of the invention: In order to overcome the shortcomings of the existing technology, the present invention provides a charging pile and control method for automatically retracting and extending the charging gun cable, so as to achieve constant force pulling, safe anti-rebound and stable suspension at any time.

[0009] Technical solution: To achieve the above objectives, the present invention provides a charging pile with automatic charging gun cable retraction, comprising a charging pile body, a charging gun, a charging cable, and a spring cable retractor; the spring cable retractor is located inside the charging pile body; the end of the charging cable led out from the spring cable retractor is connected to the charging gun.

[0010] The spring take-up device is equipped with a spring torque unit and a reel for winding the wire. The spring torque unit applies an elastic rotational torque to the reel, enabling the reel to automatically perform a winding action.

[0011] The charging pile body has a limit platform with a cable outlet. The charging cable inside the charging pile body goes out through the cable outlet.

[0012] In the initial state, the section of the charging cable exposed outside the charging pile body is referred to as the first section of the cable. A limiting component is fixedly installed at the root of the first section of the cable. The maximum outer diameter of the limiting component is larger than the outer diameter of the cable outlet, and the limiting component is limited and fitted outside the cable outlet. An adaptive control unit for the cable winding and unwinding process is arranged on the upper side of the spring retractor inside the charging pile body.

[0013] Furthermore, the adaptive control unit for cable winding and unwinding includes friction wheel a, friction wheel b, and a floating roller; the charging cable, which is obliquely led upward from the outlet of the spring cable retractor, passes between friction wheel a and friction wheel b, crosses the floating roller, and then exits through the cable outlet.

[0014] In the initial state, the portion of the charging cable passing between friction wheel a and friction wheel b is tightly clamped between friction wheel a and friction wheel b; friction wheel a is located below friction wheel b.

[0015] The a shaft of friction wheel a is rotatably mounted on bearing support a via a bearing; the output end of the motor drives and connects to the a shaft; the inner ring of friction wheel b is rotatably engaged on overrunning clutch support via an overrunning clutch; during the lead-out of the charging cable, friction wheel b will be driven to rotate forward under the action of rolling friction force, and when friction wheel b rotates forward, the overrunning clutch is in the disengaged state.

[0016] The roller shafts at both ends of the floating roller are rotatably mounted on the floating support via bearings; a guide rod is fixed on the floating support; it also includes a sleeve bracket with a ball guide sleeve; the guide rod guides through the ball guide sleeve, and a ball top is provided at the end of the section of the guide rod passing through the ball guide sleeve, and a limiting edge is provided on the outer side of the section of the guide rod passing through the ball guide sleeve;

[0017] A thrust spring is fitted over the guide rod between the floating support and the guide sleeve bracket. The thrust spring applies a thrust to the floating support, causing the outer edge of the limit switch to limit the upper end of the ball guide sleeve in the initial state. An electrical button is also included, positioned at a distance from the ball top. The electrical switch button is mounted on a button support. Guided by the ball guide sleeve, the guide rod, carrying the ball top, moves upwards at a certain distance and presses against the electrical switch button, activating it. A telescopic device is installed on the guide sleeve bracket. The telescopic part of the telescopic device connects to an overrunning clutch support. When the telescopic device applies a downward pushing force to the overrunning clutch support, the portion of the charging cable passing between friction wheels a and b is tightly clamped between friction wheels a and b.

[0018] Further, a section of the charging cable between the limiting member and the floating roller is denoted as the second cable segment, a section of the charging cable between the floating roller and the a friction wheel is denoted as the third cable segment, and a section of the charging cable between the a friction wheel and the outlet of the spring take-up device is denoted as the fourth cable segment; in the initial state, the included angle formed by the extension line of the second cable segment and the extension line of the third cable segment is less than °, and the bisector of the included angle formed by the extension line of the second cable segment and the extension line of the third cable segment coincides with the axis of the guide rod.

[0019] Further, a longitudinal charging gun receiving groove is provided at the front part of the charging pile body, a charging gun insertion port is provided at the upper end of the longitudinal charging gun receiving groove, and the lower end of the longitudinal charging gun receiving groove is a limiting platform; the end of the charging gun is inserted into the charging gun insertion port.

[0020] Further, four rollers are arranged in a "mouth" shape enclosing the lower side of the cable outlet. The four rollers are rotatably installed on a frame-shaped roller support, and a smooth cable passing channel is formed within the range enclosed by the four rollers.

[0021] Further, when the user pulls the charging cable outward, the scroll torsion spring in the spring take-up device gradually stores elastic potential energy. When it reaches a certain level, the pulling force of the user becomes larger. When the pulling force of the user reaches the threshold value F, the combined force of the tension of the second cable segment and the tension of the third cable segment on the floating roller drives the floating support to overcome the thrust of the thrust spring and make an upward oblique displacement along the extension direction of the guide rod. Until the guide rod, under the guidance of the ball guide sleeve, makes the ball top displace obliquely upward by a certain distance and presses the electrical switch button, causing the electrical switch button to be turned on; after the controller recognizes the signal that the electrical switch button is turned on, it immediately controls the motor and drives the a friction wheel to rotate forward actively, so as to actively drive the fourth cable segment to be transmitted outward under the action of rolling friction.

[0022] Further, when the user releases the hand, the floating roller automatically retracts under the thrust of the thrust spring, causing the ball top to release the electrical switch button, and the electrical switch button is turned off. After the controller receives the signal that the electrical switch button is turned off, it immediately cuts off the power supply to the motor, making the a friction wheel return to the free state. Since the part of the charging cable passing through between the a friction wheel and the b friction wheel is tightly clamped between the a friction wheel and the b friction wheel, and since the a friction wheel cannot rotate reversely under the action of the overrunning clutch, even if the user releases the hand, the charging cable will not automatically retract into the charging pile body;

[0023] After the user pulls out the charging gun from the vehicle, press the take-up control button outside the charging pile body. At this time, the controller immediately controls the telescopic device to significantly reduce the pushing force;

[0024] Finally, after the controller recognizes that the end of the charging gun is inserted into the charging gun connector, it controls the telescopic device to extend again, so that the part of the charging cable that passes between friction wheel a and friction wheel b is tightly rolled back between friction wheel a and friction wheel b; thus, it returns to the initial state.

[0025] Beneficial effects: This invention provides a charging station with an integrated "adaptive control unit for cable retraction and extension process" that automatically retracts and extends the charging gun cable. Its core innovations are as follows:

[0026] A mechanical tension-sensing trigger mechanism, consisting of a floating roller, guide rod, pressure spring, and micro switch, senses the user's pulling force in real time. When the pulling force reaches a preset comfort threshold, the motor is automatically triggered to drive the friction wheel to actively feed the line, thereby counteracting the ever-increasing pull force of the spring retractor. This achieves a user experience with a constant upper limit of pulling force, fundamentally solving the pain point of traditional spring retractors where the line becomes "heavier the more you pull."

[0027] Safety locking and suspension mechanism during the pulling process: A friction wheel with an integrated overrunning clutch is incorporated into the pulling path. When the user pulls out the cable, this clutch disengages, allowing the mechanism to operate smoothly; once the user stops pulling or releases the cable, the clutch immediately locks, preventing the cable from retracting under spring force through the friction pair. This allows the cable to be safely and stably suspended at any length after being pulled out, eliminating the safety hazard of rapid rebound and facilitating the connection of the charging gun.

[0028] Adjustable damping take-up mechanism: During automatic take-up, the controller actively reduces the clamping force between the friction wheels via the telescopic mechanism, causing the b-friction wheel, which is locked by the overrunning clutch, to switch from providing "static friction locking" to providing "sliding friction damping." This design allows the cable to be smoothly and uniformly retracted under the action of spring force, avoiding the risk of "knotting," equipment impact, and abnormal noise caused by excessive speed at the end of the take-up, thus improving the reliability and lifespan of the take-up process.

[0029] The aforementioned innovations are not isolated but rather achieved through a sophisticated mechanical layout and highly coordinated electronic control logic. The entire system forms an intelligent closed loop of perception, judgment, and execution, automatically and seamlessly switching between different operating modes throughout the entire process of retrieval, pulling out, hovering, charging, recycling, and returning to its original position. This not only enhances the user experience but also significantly improves the level of intelligence. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the charging station as a whole.

[0031] Figure 2 This is a three-dimensional schematic diagram of the charging station.

[0032] Figure 3 This is a cross-sectional view of a charging station;

[0033] Figure 4 This is a schematic diagram of the adaptive control unit for the cable winding and unwinding process. Detailed Implementation

[0034] The invention will now be further described with reference to the accompanying drawings.

[0035] like Figures 1 to 4 The charging pile shown includes a charging pile body 27, a charging gun 30, a charging cable 1, and a spring retractor 33. The spring retractor 33 is located inside the charging pile body 27. The end of the charging cable 1 extending from the spring retractor 33 is connected to the charging gun 30. The spring retractor 33 contains a spring torque unit and a reel for winding the cable. The spring torque unit applies an elastic rotational torque to the reel, enabling it to automatically wind itself. The spring torque unit is a component such as a torsion spring, preferably made of high-carbon spring steel. Its preload torque and elastic coefficient can be designed to match the cable length and weight. Traditional charging pile cable management usually relies on manual winding by the user or the use of a simple spring retractor. However, this method suffers from problems such as a significant increase in the pulling force required to pull out the cable as the length is pulled out, a poor user experience, and the cable easily rebounding rapidly when suddenly released, causing safety hazards or equipment damage. This solution aims to solve the above problems through an innovative adaptive control unit for the cable winding process.

[0036] like Figure 1 and 2 As shown, a longitudinal charging gun receiving groove 28 is provided at the front of the charging pile body 27. A charging gun insertion interface 31 is provided at the upper end of the longitudinal charging gun receiving groove 28, and a limiting platform 33 is provided at the lower end of the longitudinal charging gun receiving groove 28. The end of the charging gun 30 is inserted into the charging gun insertion interface 31. A cable passage outlet 26 is hollowed out on the limiting platform 33, and the charging cable 1 inside the charging pile body 27 passes out through the cable passage outlet 26.

[0037] In the initial state, the section of the charging cable 1 exposed outside the charging pile body 27 is referred to as the first section 1a of the cable. A limiting member 29 is fixedly installed at the root of the first section 1a of the cable. The maximum outer diameter of the limiting member 29 is larger than the outer diameter of the cable outlet 26, and the limiting member 29 is limited and fitted outside the cable outlet 26.

[0038] like Figure 2As shown in the figure below, four rollers 23 are arranged in a "U" shape around the lower side of the cable outlet 26. The four rollers 23 are rotatably mounted on a frame-like roller bracket 25. Within the area enclosed by the four rollers 23, the cable smoothly passes through the channel 24. The four enclosed rollers 23 make the process of the charging cable 1 passing through and out of the cable outlet 26 smoother. The rollers 23 are preferably made of nylon or polyoxymethylene material with a low coefficient of friction, and ball bearings can be embedded inside to ensure flexible rotation. Their function is to convert the sliding friction between the cable and the outlet edge into rolling friction, effectively reducing cable wear and pulling resistance.

[0039] like Figure 3 and 4 The upper side of the spring retractor 33 inside the charging pile body 27 is provided with an adaptive control unit 32 for the cable winding and unwinding process.

[0040] The following are the core contents of this plan:

[0041] The adaptive control unit 32 for cable winding and unwinding includes an a-friction wheel 18, a b-friction wheel 8, and a floating roller 17. The charging cable 1, extending obliquely upward from the outlet 40 of the spring take-up device 33, passes between the a-friction wheel 18 and the b-friction wheel 8, crosses the floating roller 17, and then smoothly passes through the cable passage 24 and exits upward through the cable outlet 26. The portion of the charging cable 1 passing between the a-friction wheel 18 and the b-friction wheel 8 is tightly clamped between them. The a-friction wheel 18 is located below the b-friction wheel 8. The a-shaft 20 of the a-friction wheel 18 is rotatably mounted on the a-bearing support 19 via a bearing. The a-bearing support 19 is fixed to the housing of the spring take-up device 33. A motor 21 is fixedly mounted on one side of the a-bearing support 19 via a motor bracket 22, and the output end of the motor 21 drives the a-shaft 20. The working surfaces of the a-friction wheel 18 and the b-friction wheel 8 are preferably covered with a high-friction coefficient and wear-resistant polyurethane or rubber material to provide sufficient clamping friction. The motor 21 is preferably a DC servo motor or a stepper motor with a reducer, and its power is sufficient to drive the cable to resist the maximum pull-back force of the spring take-up 33.

[0042] The inner ring of friction wheel 8 is engaged with overrunning clutch support 7 via overrunning clutch 6. During the lead-out of charging cable 1, friction wheel 8 rotates forward under the action of rolling friction. When friction wheel 8 rotates forward, overrunning clutch 6 is disengaged; conversely, overrunning clutch 6 is locked. Overrunning clutch 6, also known as a one-way bearing, has the following key function: when the user pulls the cable outward, friction wheel 8 is allowed to rotate freely; when the user releases the cable or the system attempts to retract it in the opposite direction, it immediately locks to prevent the cable from automatically retracting under the action of the spring.

[0043] The roller shafts 4 at both ends of the floating roller 17 are rotatably mounted on the floating support 2 via bearings; at least one pair of guide rods 16 extending perpendicularly to the roller shaft 4 and inclined upwards are fixedly connected to the floating support 2; it also includes a guide sleeve bracket 13, which is fixed in the inner cavity of the charging pile body 27, and at least one pair of ball guide sleeves 3 are provided on the sleeve bracket 13; the two guide rods 16 are coaxially guided through the two ball guide sleeves 3 respectively, and a ball top 12 is provided at the end of the section of the guide rod 16 passing through the ball guide sleeve 3, and a limiting outer edge 14 is provided on the outer side of the section of the guide rod 16 passing through the ball guide sleeve 3.

[0044] A thrust spring 15 is sleeved on the guide rod 16 between the floating support 2 and the guide sleeve bracket 13. The thrust spring 15 applies a thrust to the floating support 2, thereby limiting the upper end of the ball guide sleeve 3 in the initial state to the limit. The preload of the thrust spring 15 determines the system triggering auxiliary pulling force threshold F1, which can be designed within a comfortable pulling force range of, for example, 30-50 Newtons.

[0045] It also includes an electrical button 10 spaced apart from the dome 12, and the electrical switch button 10 is mounted on the button support 11; the button support 11 is fixed to the guide sleeve support 13 through the connecting frame 9; the guide rod 16, under the guidance of the ball guide sleeve 3, moves the dome 12 obliquely upward a certain distance and then presses the electrical switch button 10, so that the electrical switch button 10 is turned on. After the dome 12 is released, the electrical switch button 10 is reset to the off state under the action of the automatic reset device.

[0046] A telescopic device 5 is installed on the guide sleeve bracket 13. The telescopic part of the telescopic device 5 is connected to the overrunning clutch support 7. The telescopic device 5 applies a downward pushing force to the overrunning clutch support 7, so that the part of the charging cable 1 passing between friction wheel a 18 and friction wheel b 8 is tightly rolled between friction wheel a 18 and friction wheel b 8. The telescopic device 5 can be an electromagnetic push rod, a miniature electric cylinder or a pneumatic cylinder. The pushing force it provides, such as 100-200 Newtons, ensures the clamping force of the friction wheels on the cable, so as to provide sufficient static friction when locking is required.

[0047] The section of charging cable 1 between the limiting member 29 and the floating roller 17 is designated as the second section of cable 1b, the section of charging cable 1 between the floating roller 17 and the friction wheel 18 is designated as the third section of cable 1c, and the section of charging cable 1 between the friction wheel 18 and the outlet 40 of the spring take-up device 33 is designated as the fourth section of cable 1d.

[0048] In the initial state, the angle between the extension line of the second segment 1b of the cable and the extension line of the third segment 1c of the cable is less than 180°, and the bisector of the angle between the two segments coincides with the axis of the guide rod 16. This geometric design ensures that the resultant tension force can act efficiently along the axis of the guide rod 16, improving sensing sensitivity.

[0049] This device simulates a "smart assist" effect through a combination of mechanical and electronic control. Initially, when the user pulls the cable, the system functions like a regular spring retractor. When the pulling force reaches a preset comfort threshold, the tension sensor is triggered, and the controller instructs the motor to actively deliver the cable, thus counteracting the increasing spring pull and maintaining a light feel for the user. When the user stops pulling or needs to fix the cable length, the overrunning clutch automatically locks to prevent retraction. During retraction, the pressure between the friction wheels is released, allowing the cable to retract smoothly under spring force, with damping preventing excessive speed.

[0050] Detailed control process:

[0051] In the initial state, the end of the charging gun 30 is inserted into the charging gun connector 31; the limiting member 29 of the charging cable 1 is limited and fitted outside the cable outlet 26; the second segment 1b, the third segment 1c, and the fourth segment 1d of the cable are all relatively taut; the part of the charging cable 1 that passes between friction wheel a 18 and friction wheel b 8 is tightly rolled and clamped between friction wheel a 18 and friction wheel b 8.

[0052] When the user removes the charging gun 30, they gently pull the charging cable 1 outwards, increasing the tension in the second segment 1b, the third segment 1c, and the fourth segment 1d. Initially, the torque generated by the vortex torsion spring inside the spring retractor 33 is relatively small and does not significantly resist the user's pulling force. This allows the spring retractor 33 to smoothly release the charging cable 1 outwards under the user's slight pull and gradually accumulate elastic potential energy, causing the charging cable 1 to continuously emerge from the cable outlet 26. Friction wheel a 18 and friction wheel b 8 rotate adaptively in the forward direction under the linear motion and rolling friction of the charging cable 1. If the user suddenly releases their grip while pulling the charging cable 1 outwards, friction wheel a 18 cannot rotate in the reverse direction due to the locking action of the overrunning clutch 6. Therefore, even if the user releases their grip, the charging cable 1 will not automatically retract back into the charging pile body 27.

[0053] As the user continues to pull the charging cable 1 outward, the vortex torsion spring inside the spring retractor 33 gradually accumulates elastic potential energy. Once it reaches a certain level, the pull force generated by the spring retractor 33 begins to increase, and the user's pulling force increases. This, in turn, increases the tension of the second section 1b and the third section 1c of the cable. When the user's pulling force reaches the threshold F1, the combined force of the tension of the second section 1b and the tension of the third section 1c on the floating roller 17 will drive the floating support 2 to overcome the thrust of the thrust spring 15 and make an oblique upward displacement along the extension direction of the guide rod 16. This continues until the guide rod 16, guided by the ball guide sleeve 3, moves the ball top 12 obliquely upward a certain distance and presses the electrical switch button 10, thus turning on the electrical switch button 10.

[0054] After the controller recognizes the signal that the electrical switch button 10 is turned on, it immediately controls the motor 21 and drives the friction wheel 18 to rotate actively in the forward direction. Under the action of rolling friction, the fourth segment 1d of the cable is actively driven to be transmitted outward, thereby offsetting the pull force of the spring take-up device 33 on the fourth segment 1d of the cable. Thus, even if the pull force of the spring take-up device 33 continues to increase, the pulling force required by the user does not increase further and always remains below the threshold F1, thereby significantly improving the user experience.

[0055] When the user pulls the charging cable 1 out to a predetermined length and releases it, the floating roller 17 automatically retracts under the thrust of the thrust spring 15, causing the dome 12 to release the electrical switch button 10. After the electrical switch button 10 is disconnected, the controller immediately cuts off the power to the motor 21 after receiving the signal that the electrical switch button 10 is disconnected, so that the a friction wheel 18 returns to its free state. Since the part of the charging cable 1 that passes between the a friction wheel 18 and the b friction wheel 8 is tightly rolled between the a friction wheel 18 and the b friction wheel 8, and since the a friction wheel 18 cannot rotate in the opposite direction under the action of the overrunning clutch 6, even if the user releases the charging cable 1, it will not automatically retract back to the charging pile body 27. At this time, the charging gun 30 is plugged into the interface on the electric vehicle for charging.

[0056] After charging is complete, the user removes the charging gun 30 from the car, holds the charging gun 30, and then presses the cable retraction control button on the outside of the charging pile body 27. At this time, the controller immediately controls the telescopic device 5 to significantly reduce the pushing force, thereby significantly reducing the tight clamping state of the charging cable 1 passing through the section between friction wheel a 18 and friction wheel b 8. This significantly reduces the pressure and maximum static friction of the outer wheel of friction wheel b 8 on the surface of the charging cable 1. At this time, the charging cable 1 exposed outside the charging pile body 27 is driven by the spring winding torque of the spring retractor 33. The cable gradually retracts into the spring retractor 33 until the limiting member 29 of the charging cable 1 is locked outside the cable outlet 26, at which point it automatically stops. During the process of the charging cable 1 gradually retracting into the spring retractor 33 under the drive of the spring winding torque, the b friction wheel 8 cannot rotate in the opposite direction under the action of the overrunning clutch. Therefore, during this stage, the sliding friction force of the outer wheel of the b friction wheel 8 on the charging cable 1 acts as a damper to prevent the cable retraction process from being too fast. Meanwhile, the a friction wheel 18 rolls adaptively under the linear motion of the charging cable 1.

[0057] Then the user manually inserts the end of the charging gun 30 into the charging gun connector 31; finally, after the controller recognizes that the end of the charging gun 30 is inserted into the charging gun connector 31, it controls the telescopic device 5 to increase the thrust again, so that the part of the charging cable 1 passing between friction wheel a 18 and friction wheel b 8 is more tightly rolled between friction wheel a 18 and friction wheel b 8; thus, it returns to the initial state.

[0058] Without the adaptive control unit 32, the purely mechanical spring retractor 33 requires a coordinated system of three parts: a constant force spring mechanism, a one-way clutch, and a damping brake mechanism. The constant force spring mechanism includes a spring box for storing the constant force spring and an output drum. The rebound torque provided by the constant force spring during winding needs to be essentially constant; the variable torque of the traditional spiral spring, which is low-cost and simple in structure, cannot be used in this solution. One end of the constant force spring is fixed to the spring box, and the other end is wound and fixed to the output drum. The one-way clutch is located on the reel spindle or transmission path. When the user pulls out the cable, the clutch is in an overrunning state, disconnecting the connection between the constant force spring and the reel. When the user stops pulling and needs to retract the cable, the clutch automatically engages, transmitting the constant retraction torque of the constant force spring to the reel, achieving automatic rewinding.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A charging station with automatic retraction and extension of the charging gun cable, characterized in that: It includes a charging pile body (27), a charging gun (30), a charging cable (1) and a spring retractor (33); the spring retractor (33) is inside the charging pile body (27); the end of the charging cable (1) led out from the spring retractor (33) is connected to the charging gun (30). The spring take-up device (33) is equipped with a spring torque unit and a reel for winding the wire. The spring torque unit applies an elastic rotational torque to the reel, so that the reel can automatically perform a winding action. The charging pile body (27) has a limiting platform (33), and the limiting platform (33) has a hollowed-out cable outlet (26). The charging cable (1) inside the charging pile body (27) passes out through the cable outlet (26). In the initial state, the section of the charging cable (1) exposed outside the charging pile body (27) is called the first section of the cable (1a). A limiting member (29) is fixedly installed at the root of the first section of the cable (1a). The maximum outer diameter of the limiting member (29) is greater than the outer diameter of the cable outlet (26), and the limiting member (29) is limited and fitted outside the cable outlet (26).

2. The charging pile with automatic charging gun cable retraction and extension according to claim 1, characterized in that: The upper side of the spring take-up device (33) inside the charging pile body (27) is provided with a cable take-up and release process adaptive control unit (32). The cable take-up and release process adaptive control unit (32) includes a friction wheel (18), a friction wheel (8) and a floating roller (17). The charging cable (1) is obliquely led upward from the outlet (40) of the spring take-up device (33), passes between the friction wheel (18) and the friction wheel (8), crosses the floating roller (17), and then passes out of the cable outlet (26). Friction wheel a (18) is located below friction wheel b (8); the a shaft (20) of friction wheel a (18) is rotatably mounted on bearing support (19) via bearings; the output end of motor (21) drives and connects to shaft a (20); the inner ring of friction wheel b (8) is rotatably engaged on overrunning clutch support (7) via overrunning clutch (6); The floating roller (17) is rotatably mounted on the floating support (2); a guide rod (16) is fixed on the floating support (2); a ball guide sleeve (3) is provided on the sleeve support (13); the guide rod (16) is guided through the ball guide sleeve (3), and a ball top (12) is provided at the end of the section of the guide rod (16) passing through the ball guide sleeve (3), and a limiting outer edge (14) is provided on the outer side of the section of the guide rod (16) passing through the ball guide sleeve (3); a thrust spring (15) is sleeved on the guide rod (16) between the floating support (2) and the guide sleeve support (13), and the thrust spring (15) applies a thrust to the floating support (2) to make the limiting outer edge (14) in the initial state be in limiting cooperation with the upper oblique end of the ball guide sleeve (3); it further includes an electric button (10) arranged at a distance from the ball top (12); the guide rod (16) moves a certain distance with the ball top (12) under the guidance of the ball guide sleeve (3) and then presses the electric switch button (10); a telescopic device (5) is installed on the guide sleeve support (13), and the telescopic part of the telescopic device (5) is connected to the overrunning clutch support (7), and the telescopic device (5) applies a downward pushing force to the overrunning clutch support (7) to tightly roll and clamp the part of the charging cable (1) passing through between the a friction wheel (18) and the b friction wheel (8).

3. The charging pile with automatic charging gun cable retraction and extension according to claim 2, characterized in that: The section of the charging cable (1) between the limiting member (29) and the floating roller (17) is denoted as the second cable section (1b), the section of the charging cable (1) between the floating roller (17) and the a friction wheel (18) is denoted as the third cable section (1c), and the section of the charging cable (1) between the a friction wheel (18) and the outlet (40) of the spring take-up device (33) is denoted as the fourth cable section (1d); in the initial state, the included angle formed by the extension line of the second cable section (1b) and the extension line of the third cable section (1c) is less than 180°, and the bisector of the included angle formed by the extension line of the second cable section (1b) and the extension line of the third cable section (1c) coincides with the axis of the guide rod (16).

4. A charging station with automatic charging gun cable retraction and extension according to claim 3, characterized in that: A longitudinal charging gun receiving groove (28) is provided at the front part of the charging pile body (27), a charging gun insertion port (31) is provided at the upper end of the longitudinal charging gun receiving groove (28), and the lower end of the longitudinal charging gun receiving groove (28) is the limiting platform (33); the end of the charging gun (30) is inserted into the charging gun insertion port (31).

5. A charging station with automatic charging gun cable retraction and extension according to claim 1, characterized in that: Four rollers (23) are arranged in a "mouth" - shaped enclosure on the lower side of the cable outlet (26), the four rollers (23) are rotatably mounted on the frame - shaped roller support (25), and a smooth cable passing channel (24) is formed within the enclosure of the four rollers (23).

6. The control method for an automatic charging station cable retraction and extension system according to claim 4, characterized in that: When the user pulls the charging cable (1) outward, the vortex torsion spring in the spring take-up device (33) gradually stores elastic potential energy to a certain extent, and the user's pulling force increases. When the user's pulling force reaches the threshold F1, the combined force of the tension of the second section (1b) of the cable and the tension of the third section (1c) of the cable on the floating roller (17) drives the floating support (2) to overcome the thrust of the thrust spring (15) and make an oblique upward displacement along the extension direction of the guide rod (16) until the guide rod (16) moves obliquely upward with the ball top (12) under the guidance of the ball guide sleeve (3) and presses the electric switch button (10) to turn on. After the controller recognizes the signal that the electric switch button (10) is turned on, it immediately controls the motor (21) and drives the friction wheel (18) to rotate actively in the positive direction, thereby actively driving the fourth section (1d) of the cable to be transmitted outward under the action of rolling friction.

7. The control method for an automatic charging station cable retraction and extension system according to claim 6, characterized in that: When the user releases the hand, the floating roller (17) automatically retracts under the thrust of the thrust spring (15), causing the ball top (12) to release the electrical switch button (10). The electrical switch button (10) is disconnected. After receiving the signal that the electrical switch button (10) is disconnected, the controller immediately cuts off the power to the motor (21), allowing friction wheel a (18) to return to its free state. Since the part of the charging cable (1) passing between friction wheel a (18) and friction wheel b (8) is tightly rolled between friction wheel a (18) and friction wheel b (8), and since friction wheel a (18) cannot rotate in the opposite direction under the action of the overrunning clutch (6), therefore... Even if the user releases the charging cable (1), it will not automatically retract back into the charging pile body (27); after the user pulls the charging gun (30) out of the car, press the cable retraction control button on the outside of the charging pile body (27), at which time the controller immediately controls the telescopic device (5) to significantly reduce the pushing force; finally, after the controller recognizes that the end of the charging gun (30) is inserted into the charging gun plug interface (31), it controls the telescopic device (5) to extend again, so that the part of the charging cable (1) passing through the friction wheel (18) and the friction wheel (8) is tightly rolled and clamped between the friction wheel (18) and the friction wheel (8); thus, it returns to the initial state.

8. A charging station with automatic charging gun cable retraction and extension according to claim 1, characterized in that: The spring take-up device (33) consists of three parts working together: a constant force spring mechanism, a one-way clutch, and a damping brake mechanism. The constant force spring mechanism includes a spring box for storing the constant force spring and an output drum. The constant force spring provides a constant rebound torque during the winding process. One end of the constant force spring is fixed to the spring box, and the other end is wound and fixed to the output drum. The one-way clutch is located on the main shaft of the reel or on the transmission path. When the user pulls out the cable, the clutch is in an overrunning state, disconnecting the connection between the constant force spring and the reel. When the user stops pulling and needs to retract the cable, the clutch automatically "engages", transmitting the constant retraction torque of the constant force spring to the reel to achieve automatic rewinding.

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