Alternating current charging pile cable automatic retracting device based on inserting gun

Abstract

The invention discloses an alternating current charging pile cable automatic retracting device based on a plug gun, and belongs to the field of electric vehicle charging equipment. The device comprises a shell assembly, an automatic take-up assembly, a charging plug gun assembly and a charging pile mainboard, and all the assemblies work cooperatively. The shell assembly comprises a waterproof plug wire hole, a cable waterproof joint and a protective cover, so that multiple protection is realized; a touch switch is arranged in a gun returning seat of the charging gun inserting assembly, and a take-up signal is triggered after a gun inserting head returns to the original position; the automatic take-up assembly realizes automatic take-up and pay-off and any-length locking of a cable through a take-up wheel, a gear transmission part and a locking mechanism; the charging pile main board is responsible for signal transmission and overall control. The device solves the problems that a traditional cable is easy to wear, tedious in storage, unreliable in take-up and the like, and is convenient to operate, high in protection performance, suitable for the outdoor environment and convenient to maintain, and the service life of the cable is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of electric vehicle charging equipment technology, and particularly relates to an automatic cable retraction device for AC charging piles based on a plug-in gun. Background Technology

[0002] Existing AC charging piles mostly use fixed-length charging cables, which presents several problems during use: First, the cables easily drag on the ground, causing wear and aging of the outer sheath due to friction, and even posing a risk of electrical leakage; second, manual handling and storage are required after use, which is cumbersome, and the cables are prone to tangling and knotting, affecting future use; third, some charging piles with cable retraction functions have problems such as uneven cable retraction and unreliable locking mechanisms, making it impossible to accurately control the cable length; fourth, there is a lack of effective waterproof and dustproof protection structures, allowing external moisture and dust to easily enter the equipment, damaging core components and shortening the equipment's lifespan. To solve the above technical problems, this invention proposes an automatic cable retraction device for AC charging piles that features a reasonable structure, reliable cable retraction, and strong protection. Summary of the Invention

[0003] I. Purpose of the Invention

[0004] The purpose of this invention is to provide an automatic cable retraction device for AC charging piles based on a plug-in gun, which solves the problems of inconvenient cable storage, easy wear, poor cable retraction reliability and insufficient protection performance of existing charging piles. It realizes automatic and smooth cable retraction and stable locking, and improves the waterproof and dustproof capabilities of the equipment, ensuring a safe and efficient charging process.

[0005] II. Technical Solution

[0006] The purpose of this invention is to provide an automatic cable retraction device for AC charging piles based on a plug-in nozzle, aiming to solve the problems existing in the background art. To achieve this purpose, the technical solution adopted by this invention is:

[0007] An automatic cable retraction device for AC charging piles based on a charging gun includes a housing assembly, an automatic cable retraction assembly, a charging gun assembly, and a charging pile motherboard. These components work together to achieve a stable electrical connection between the charging pile and the new energy vehicle, while also automatically retracting and positioning the cable. The housing assembly serves as the mounting and protective carrier, providing a stable foundation and all-around protection for the internal components. The charging gun assembly is responsible for the electrical connection and triggering the cable retraction signal. The automatic cable retraction assembly performs the cable winding, retraction, and positioning operations. The charging pile motherboard is responsible for signal transmission and overall control.

[0008] Furthermore, the housing assembly includes a housing, front cover, moving parts, fasteners, display screen assembly, waterproof wiring hole, waterproof cable connector, column and protective cover. The housing has a hollow structure, which reserves installation space for the automatic cable retraction assembly and the charging pile motherboard, and provides a supporting foundation for each functional component.

[0009] Furthermore, one end of the front cover is movably connected to the housing via a hinge, while the other end is opened and closed by engaging with the corresponding fastener on the housing via a movable component. This openable structure facilitates the inspection and maintenance of internal components, and the display screen component mounted on its surface can display information such as charging status and cable length in real time, providing intuitive guidance for user operation.

[0010] Furthermore, the bottom of the housing is equipped with both a waterproof insertion gun hole and a waterproof cable connector. The waterproof insertion gun hole allows the insertion gun wire to pass through, preventing moisture from entering the housing from where the cable passes through. The waterproof cable connector is used for waterproof sealing of external wiring. The two work together to further improve the overall waterproof performance of the device.

[0011] Furthermore, a column is fixedly installed on the rear side of the housing, and a protective cover is fitted on the top of the column. The protective cover can cover the area above the housing, effectively preventing rainwater, dust and other impurities from entering the housing. Together with the waterproof gun hole and the waterproof cable connector, it forms a double protection to ensure the stable operation of the internal components.

[0012] Furthermore, the charging plug assembly includes a plug cable, a plug head, a touch switch, and a retractable plug holder. Its core function is to enable charging connection with electric vehicles and trigger automatic cable retraction, forming a closed-loop coordination of "connection-charging-cable retraction".

[0013] Furthermore, the charging gun cable is a flexible conductive cable. One end is fixed inside the left side of the housing assembly and forms an electrical connection with the charging pile motherboard. The other end is integrated with the charging gun head and realizes current transmission. The specifications of the charging gun head are compatible with the electric vehicle charging port to ensure the sealing and stability of the charging connection.

[0014] Furthermore, the return gun holder is fixed to the right side surface of the housing assembly, and its structure matches the gun head. After charging is completed, the gun head can be inserted into the return gun holder for secure fixation, preventing damage or safety hazards caused by careless placement of the gun head.

[0015] Furthermore, a touch switch is embedded inside the return gun holder. This touch switch is electrically connected to the charging pile mainboard installed at the bottom of the housing. When the insertion gun head is inserted into the return gun holder and the touch switch is triggered, the switch will send a signal to the charging pile mainboard, thereby triggering the subsequent automatic cable retraction action.

[0016] Furthermore, the automatic cable retraction assembly is installed inside the housing assembly, including a cable reel, a fixed frame, and a transmission component. Its core function is to achieve automatic retraction, length positioning, and locking of the cable, ensuring convenient cable use and neat cable storage.

[0017] Furthermore, the fixed frame is fixed inside the housing to provide a stable mounting base for the take-up reel and transmission components. The take-up reel is rotatably mounted on the fixed frame. After the insertion gun line is wound around the take-up reel, it passes through the waterproof insertion gun hole at the bottom of the housing and connects with the return gun seat to ensure a reasonable cable storage path.

[0018] Furthermore, the take-up reel consists of a first housing, a winding stop, a positioning stop, a circular gear rack, a second housing, a circular stop, a groove, a third housing, a winding hole, a wire spring, a wire spring shaft, a stop device, and an arc ratchet. All components work together to achieve the functions of winding, power supply, and locking.

[0019] Furthermore, a circular gear rack is integrally formed on the outer side of the first housing for meshing with the transmission component for transmission. An integrally formed winding stop and a positioning stop are formed inside. The positioning stop is located inside the winding stop and can accurately position the insertion gun line wound on the take-up reel to prevent the cable from tangling and shifting.

[0020] Furthermore, the second housing has an integrally formed circular baffle, which is larger than the winding baffle. The two are detachably connected and form a closed winding space after assembly. The space is provided with a winding hole. After the insertion wire is wound around the winding baffle through the winding hole, it passes through the axis of the first housing and then connects to the return gun seat through the waterproof insertion hole, ensuring that the cable is wound in an orderly manner.

[0021] Furthermore, a stop device is installed inside the circular flange, and an arc-shaped ratchet is provided on the axis of the second housing. The arc-shaped ratchet and the stop device mesh with each other. Through the cooperation of the two, the take-up reel can be locked in time to prevent the plug-in line from retracting on its own during use and to ensure the safety of user operation.

[0022] Furthermore, a groove is provided on the outer side of the second housing, and the third housing is adapted to be installed in the groove. A wire spring shaft is provided on the axis of the third housing, and a wire spring is assembled inside. The wire spring shaft passes through the third housing and is connected to the wire spring. The wire spring provides continuous retraction power to the take-up reel, ensuring that the cable can be smoothly retracted.

[0023] Furthermore, the transmission components are used to unlock the take-up reel and drive it to rotate. These components include a geared motor, a transmission gear fixing component, a paddle, a first gear, and a second gear. The components mesh to form a complete transmission chain, ensuring precise transmission of the action.

[0024] Furthermore, the transmission gear fixing component is installed on the head of the take-up reel, and the motor with gears, the first gear and the second gear are arranged sequentially from top to bottom. The three mesh with each other. The second gear passes through the transmission gear fixing component and meshes with the circular gear rack of the take-up reel, realizing the transmission of motor power to the take-up reel.

[0025] Furthermore, a motor controller and a 220V AC to DC24 transformer are also installed on the top of the fixed frame. The motor controller is electrically connected to the charging pile motherboard to monitor the motor's operating status (such as speed and start / stop position) in real time, ensuring that the transmission action is precise and controllable, and avoiding situations where the cable is over- or incompletely stored. The 220V AC to DC24 transformer is used to convert the voltage.

[0026] Furthermore, the charging pile motherboard is fixedly installed inside the housing assembly. In addition to being electrically connected to the touch switch and the geared motor, it also interacts with the display screen assembly. It can receive the wire retraction trigger signal from the touch switch and the motor status signal, and can also control the start and stop of the motor and drive the display screen to display relevant information, thereby achieving coordinated control of the overall function of the device.

[0027] The beneficial effects of this invention are:

[0028] It enables automatic cable retraction. Once charging is complete, simply insert the charging gun head back into the charging socket to trigger the cable retraction action. No manual handling is required, making it easy to operate. It also avoids wear and tear caused by the cable dragging on the ground, extending the cable's lifespan.

[0029] The take-up reel achieves reliable locking through the engagement of a stopper and an arc ratchet. When unloading the cable, it can be pulled to any length as needed and automatically locked, preventing the cable from retracting itself or being overstretched, thus providing high flexibility in use.

[0030] It features a multi-layered waterproof and dustproof protection structure. The waterproof plug hole, waterproof cable connector, and protective cover work together to effectively prevent moisture and dust from entering the equipment, protect the core components, and improve the equipment's adaptability and service life in outdoor environments.

[0031] The transmission components use gear meshing transmission, which is precisely matched with the take-up reel. The take-up reel unlocking response is timely, and the take-up process is smooth and stable without any jamming.

[0032] The overall structure is reasonably designed, the components are highly modular, and the assembly is convenient. The openable front cover design facilitates later maintenance and repair, reducing maintenance costs. Attached Figure Description

[0033] Figure 1 This is an overall schematic diagram provided for an embodiment of the present invention;

[0034] Figure 2 This is a partial structural diagram provided for an embodiment of the present invention;

[0035] Figure 3 This is a partial structural diagram provided for an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the automatic take-up component structure according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the take-up reel structure according to an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of the take-up reel structure according to an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the take-up reel structure according to an embodiment of the present invention;

[0040] Figure 8 This is a schematic diagram of the transmission component structure according to an embodiment of the present invention;

[0041] Figure 9 This is a schematic diagram of the meshing structure of the circular gear rack and the second gear according to an embodiment of the present invention.

[0042] The following are the labeling elements in the figure:

[0043] 1-Housing assembly, 11-Housing, 12-Front cover, 13-Moving part, 14-Display assembly, 15-Waterproof cable insertion hole, 16-Fastener, 17-Waterproof cable connector, 18-Post, 19-Protective cover; 2-Automatic cable reel assembly, 21-Cable reel, 211-First housing, 212-Winding guard, 213-Positioning guard, 214-Circular gear rack, 215-Second housing, 216-Circular guard, 217-Groove, 218-Third housing, 219-Winding hole, 2 20-Wire spring, 221-Wire spring shaft, 222-Always-on stop, 223-Circular arc ratchet, 22-Fixed frame, 23-Transmission component, 231-Motor with gear, 232-Transmission gear fixing component, 233-Pulley, 234-First gear, 235-Second gear; 24-Motor controller; 25-220V AC to DC 24V transformer; 3-Charging gun assembly, 31-Gun wire, 32-Gun head, 33-Touch switch, 34-Gun return socket; 4-Charging pile mainboard. Detailed Implementation

[0044] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0045] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element present. Conversely, when an element is referred to as being "directly on" another element, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. The terms "upper end," "lower end," "left side," "right side," "front end," "rear end," and similar expressions used herein refer to the positional relationship with reference to the accompanying drawings.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0047] The technical solution of this patent will be further described in detail below with reference to specific embodiments.

[0048] like Figures 1-9 As shown, the core of this invention lies in constructing an integrated cable management system encompassing protection, transmission, and control. Through precise selection and coordinated assembly of each component, it solves the problems of messy cables, inconvenient storage, and insufficient outdoor protection in traditional charging piles. Simultaneously, it achieves precise control over cable pull-out positioning and automatic retraction. The device as a whole consists of a housing component 1, a charging gun component 3, an automatic cable retraction component 2, and a charging pile mainboard 4. Each component performs its specific function while maintaining interconnectivity, ensuring structural stability, outdoor adaptability, and ease of operation.

[0049] In the selection and assembly of housing component 1, the core design principle is "protection first, convenient maintenance". Housing 11 is made of high-strength steel through sheet metal processing, with multiple reinforcing ribs integrally formed internally. The ribs have a trapezoidal cross-section, effectively improving the overall impact resistance of housing 11 and protecting internal components from outdoor bumps and pressure. The front cover 12 is made of the same weather-resistant material as housing 11, ensuring the overall structural compatibility and weather resistance consistency. It is connected to housing 11 via a hinge, allowing for a wide range of opening and closing, facilitating comprehensive maintenance of internal components. The movable part 13 at the end of the front cover 12 uses a snap-fit ​​mechanism, corresponding to the fastener 14 at the end of housing 11, which is a matching snap-fit ​​lock seat. The snap-fit ​​and lock seat fit tightly, ensuring both sealing performance and quick opening and closing, balancing practicality and sealing.

[0050] The LCD display assembly 5 is secured to the center of the front cover 12 with anti-loosening bolts to prevent outdoor vibrations from causing the display to loosen. The display assembly 5 is connected to the charging pile motherboard 4 via a shielded data cable, and can synchronously display charging voltage, current, remaining time, and cable storage status in real time. The screen brightness supports automatic adjustment to adapt to the visibility requirements of different lighting environments. The bottom of the housing 11 has a pre-drilled internal threaded mounting hole. The waterproof cable connector 15 is screwed into this hole, and when the insertion gun cable 31 passes through, it fits tightly with the internal sealing structure of the connector, effectively preventing rainwater and dust from entering through the cable, making it suitable for humid and dusty outdoor environments. Two stainless steel columns 16 are fixed to the rear of the housing 11 with fasteners. The top of the columns 16 is fixed with a transparent protective cover 17, which can block rainwater, fallen leaves, dust, and other impurities from all directions, while not affecting the visual inspection of internal components, further enhancing outdoor protection capabilities.

[0051] The charging gun assembly 3, as the core of electrical connection and cable retraction triggering, requires selection that balances conductivity stability, weather resistance, and signal triggering accuracy. The charging gun cable 31 uses a weather-resistant copper core cable to ensure low conductivity loss. It is externally wrapped with an insulation layer treated for aging and low-temperature resistance, allowing for stable operation over a wide temperature range and preventing cracking and aging. The overall cable length is rationally set according to the charging pile application scenario, balancing charging coverage and storage convenience. The charging gun head 32 is designed strictly according to relevant standards, using a flame-retardant shell and integrating internal leakage and overcurrent protection modules. It is reliably fixed to the charging gun cable 31, ensuring reliable conductivity at the joint and meeting tensile strength requirements, preventing poor contact or cable detachment during insertion and removal. The return gun holder 33 adopts a card slot that is precisely adapted to the shape of the insertion gun head 32 and is installed on the right side surface of the housing component 1. A small micro switch is embedded inside, and its signal line is connected to the charging pile motherboard 4 through a shielded wire. When the insertion gun head 32 is fully inserted into the return gun holder 33, the retraction signal can be accurately triggered, effectively avoiding false triggering and missed triggering.

[0052] The automatic cable reel assembly 2, as the core of cable storage, achieves neat cable winding and length positioning through precise transmission design and component selection. The reel 21 is made of reinforced engineering plastic injection molding with an integrally formed annular groove on the surface to prevent cable shifting and tangling during winding. A circular gear rack 211 is set on the outer periphery of the head of the reel 21, and the tooth surface is reinforced to improve wear resistance and transmission accuracy. The fixed frame 22 is made of high-strength plate through stamping, and its size is precisely matched with the reel 21 and transmission components 23. It is fixed inside the housing 11. The bottom of the frame is equipped with a shock-absorbing structure to reduce vibration and noise during transmission. At the same time, the top is fixed with a line protection structure to fix and protect the branch lines of the insertion gun line 31, preventing poor contact caused by line pulling and vibration, and improving the stability and service life of the line connection.

[0053] The transmission component 23 adopts a multi-stage gear meshing design to ensure stable power transmission and sufficient torque. The geared motor 231 is a DC geared motor, which can smoothly drive the take-up reel 21 to rotate, avoiding pull and breakage during cable winding. The motor output shaft gear meshes with the first gear 234. Both the first gear 234 and the second gear 235 are spur gears, and speed regulation and torque amplification are achieved through multi-stage meshing. The transmission gear fixing component 232 is made of high-strength material, with precise pre-drilled mounting holes for the motor and gears. The motor, the first gear 234, and the second gear 235 are fixed sequentially from top to bottom. The second gear 235 meshes with the circular gear rack 211 of the take-up reel 21 to form a complete transmission chain, ensuring transmission efficiency. The paddle 233 is fixed to the motor housing. The motor controller 24 is electrically connected to the charging pile main board 4 via a signal line. It can accurately receive the trigger signal from the micro switch of the return gun holder 33 and monitor the motor's operating status in real time. The top of the fixed frame 22 is also equipped with the motor controller 24 and the 220V AC to DC 24 transformer 25. The charging pile main board 4 is electrically connected to the motor controller 24 and is used to control the geared motor 231. The 220V AC to DC 24 transformer 25 is used to convert the voltage. In addition, the take-up reel 21 also integrates a self-locking structure 24. It uses the gear meshing characteristics to lock the take-up reel 21 when the cable is pulled out, maintain the pulled-out length, and prevent the cable from loosening due to accidental pulling.

[0054] The charging pile motherboard 4 uses a dedicated main control motherboard adapted for AC charging piles, integrating multi-functional modules such as signal reception, charging management, and status monitoring. It is precisely adapted to the mounting bracket at the bottom of the housing 11 and fixed with fasteners. An insulation structure is set at the bottom to avoid the risk of leakage. The motherboard is electrically connected to the display screen assembly 5, the geared motor 231, the motor controller 24, and the microswitches of the return gun holder 33 through dedicated circuits, forming a closed-loop control circuit. It can quickly process feedback signals from various components and realize functions such as charging status monitoring, reel-in command issuance, and motor start / stop control, ensuring accurate and efficient operation.

[0055] The working process of this embodiment is divided into two stages: cable extension and positioning, and automatic cable retraction, achieving full automation control and status visualization. During the cable extension and positioning stage, when the user holds the connector head 32 and pulls it outward, the connector cable 31 drives the take-up reel 21 to rotate. The take-up reel 21 drives the first gear 234 and the second gear 235 to rotate synchronously via a circular gear rack 211. At this time, the self-locking structure 24 of the transmission component 23 is activated, using the gear meshing characteristics to lock the take-up reel 21, thereby maintaining the extended length of the connector cable 31 and preventing cable loosening caused by accidental pulling. After the user inserts the connector head 32 into the new energy vehicle charging interface, the charging pile mainboard 4 detects that the charging circuit is connected and controls the display screen component 5 to display status parameters such as charging voltage, current, and remaining time, while continuously monitoring the cable connection status.

[0056] During the automatic retraction phase, charging termination confirmation: When the vehicle is fully charged or the user no longer needs to charge, the charging stop process must be completed through device operation (such as scanning the code to stop, pressing the pause button). After the display component 14 displays "Charging complete" and the device indicator light switches to standby mode, it is confirmed that the charging circuit has been completely disconnected to avoid safety hazards caused by pulling the gun while it is powered on. Retraction signal trigger: The user holds the charging gun handle, presses the unlock button of the plug head 32 to release the engagement with the vehicle charging port, and smoothly pulls out the plug head 32; then aligns the plug head 32 with the return gun seat 34 and inserts it into the fixed position at a uniform speed. At this time, the touch switch 33 inside the return gun seat 34 is precisely triggered, and the trigger signal is quickly transmitted to the motor controller 24 through the shielded wire, forming a retraction command trigger closed loop. Transmission coordination and take-up action: After receiving the signal, the motor controller 24 immediately sends a start command to the geared motor 231 of the transmission component 23. After the geared motor 231 starts, it drives the first gear 234 to rotate through the output shaft gear. The first gear 234 drives the second gear 235 to rotate synchronously. The second gear 235 meshes with the circular gear rack 214 of the take-up reel 21, thereby driving the take-up reel 21 to rotate, causing the stop device 222 to disengage from the circular ratchet 223 and unlocking the take-up reel 21. At this time, the wire spring 220 releases its stored force, driving the take-up reel 21 to rotate smoothly in the opposite direction. The insert wire 31 is evenly wound along the area between the winding guard 212 and the circular guard 216, and gradually retracted into the housing 11, avoiding the cable from tangling, knotting, or becoming messy. Cable retraction completion and locking: When the plug cable 31 is fully retracted and the plug head 32 and the return gun seat 34 are tightly engaged, the motor controller 24 detects the change in the motor's operating status and sends a "cable retraction in place" signal to the charging pile main board 4. At the same time, the stop device 222 and the arc ratchet 223 re-engage, locking the retractor 21 in place. The display component 14 switches to display the "cable retraction complete" status. The entire cable retraction process is completed automatically without manual intervention.

[0057] To ensure the long-term stable operation of the device, regular maintenance and inspection are required. By operating the movable part 13 (clasp) of the front cover 12, the clasp is separated from the fastener 14 (clasp lock seat) of the housing 11. The front cover 12 can then be opened via the hinge to inspect the automatic cable reel assembly 2, charging pile mainboard 4, and other components inside the housing 11. The focus should be on checking the gear meshing status, wiring connections, and any abnormal noises from the motor, facilitating quick troubleshooting. The waterproof cable connector 15 and protective cover 17 need to be inspected regularly, with a focus on checking for aging or deformation of the sealing structure, and ensuring the protective cover 17 is securely fixed and undamaged to prevent failure of its waterproof and dustproof performance. Simultaneously, the circular gear rack 211 and transmission gears (first gear 234, second gear 235) of the reel 21 require regular lubrication. Applying an appropriate amount of lubricant reduces gear meshing wear, ensures smooth transmission, and removes dust and impurities from the gear surfaces to prevent jamming.

[0058] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also fall within the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. An automatic cable retraction device for AC charging piles based on a plug-in nozzle, characterized in that: The device includes a housing assembly, an automatic cable retraction assembly, and a charging gun assembly. The automatic cable retraction assembly is installed inside the housing assembly. The charging gun assembly's charging gun wire is installed inside the left side of the housing assembly. The head of the charging gun assembly's charging gun wire is integrated with a charging gun head. After being wound around the automatic cable retraction assembly, the charging gun wire passes through the bottom of the housing assembly and connects to the charging gun assembly's return socket on the right side surface of the housing assembly. The charging plug assembly includes a plug wire, a plug head, a touch switch, and a return socket. One end of the plug wire is installed inside the left side of the housing assembly, and the other end of the plug wire is electrically connected to the plug head. The return socket is installed on the right side surface of the housing assembly, and the plug head is adapted to the return socket. The touch switch is located inside the return socket.

2. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 1, characterized in that: The bottom of the housing assembly is also equipped with a charging pile motherboard, which is connected to the touch switch.

3. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 2, characterized in that: The housing assembly includes a housing, a front cover, a movable component, a display screen assembly, a waterproof connector, and fasteners. One end of the front cover is hinged to one end of the housing, and the other end of the front cover is provided with the movable component. The other end of the housing is also provided with the movable component, which is adapted to the fasteners. The surface of the front cover is provided with the display screen assembly, and the bottom of the housing is provided with the waterproof connector, through which the connector cable passes.

4. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 3, characterized in that: The bottom of the housing is equipped with a waterproof cable connector, which is used for waterproofing external wiring.

5. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 4, characterized in that: A column is installed on the rear side of the housing, and a protective cover is provided on the top of the column to prevent water and dust from entering the interior of the housing.

6. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 5, characterized in that: The automatic take-up assembly includes a take-up reel, a fixed frame, and a transmission component. The take-up reel is mounted on the fixed frame, and the transmission component is installed at the head of the take-up reel. The transmission component is used to unlock the take-up reel.

7. An automatic cable retraction device for AC charging piles based on a plug-in gun, as described in claim 5 or 6, characterized in that: The take-up reel includes a first housing, a winding guard, a positioning guard, a circular gear rack, a second housing, a circular guard, a groove, a third housing, a winding hole, a wire spring, a wire spring shaft, a stop mechanism, and an arc-shaped ratchet. The circular gear rack is integrally formed on the outer side of the first housing. The winding guard and the positioning guard are integrally formed inside the first housing, with the positioning guard inside the winding guard. The circular guard is larger than the winding guard and is detachably connected. A groove is provided between the winding guard and the circular guard. The winding hole allows the insertion wire to be wound around the winding guard and then pass through the axis of the first housing. After passing through the axis of the first housing, the insertion wire passes through the waterproof insertion hole and connects to the return gun seat. The circular guard is equipped with the real-time stop device. The axis of the second housing is provided with the arc ratchet, which meshes with the real-time stop device. The outer side of the second housing is provided with the groove, and the third housing is mounted on the groove. The axis of the third housing is provided with the wire spring shaft, and the wire spring is provided inside the third housing. The wire spring shaft passes through the third housing and connects to the wire spring.

8. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 7, characterized in that: The transmission component includes a geared motor, a transmission gear fixing member, a paddle, a first gear, and a second gear. The transmission gear fixing member is installed at the head of the take-up reel. The transmission gear fixing member has the geared motor, the first gear, and the second gear arranged sequentially from top to bottom. The geared motor, the first gear, and the second gear mesh with each other. The second gear passes through the transmission gear fixing member and meshes with the circular gear rack of the take-up reel. The paddle is arranged on the outside of the geared motor. The paddle is used to pull the second gear out of the third gear when the second gear does not automatically disengage when take-up is required.

9. The automatic cable retraction device for AC charging piles based on plug-in guns according to claim 7, characterized in that: The top of the fixed frame is also equipped with a motor controller and a 220V AC to DC 24V transformer.

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