Charging gun protection device, charging gun and charging equipment

Abstract

The application relates to the technical field of charging equipment, and particularly discloses a charging gun protection device, a charging gun and charging equipment, both connecting lines are arranged in a protection pipe, the two connecting lines are spirally arranged on the outer side of a wire, one end of each of the two connecting lines is fixedly connected with a charging plug; a detection circuit is electrically connected with a power supply, a normally open switch is arranged on the detection circuit, and the other end of each of the two connecting lines is connected with the normally open switch; a torsion protection mechanism comprises an electric control switch assembly and / or an alarm, the electric control switch assembly is electrically connected with the detection circuit, and the electric control switch assembly is used for controlling the power-on or power-off of a charging circuit; and the alarm is arranged on the detection circuit. When the degree of torsion of the cable is large, the connecting lines can pull the normally open switch to be closed, the alarm gives an alarm, and the electric control switch assembly is disconnected, so as to remind a user to arrange the cable. When the cable is not twisted or the degree of torsion is small, the alarm does not work, the electric control switch assembly is closed, and the charging gun normally works.

Description

Technical Field

[0001] This invention relates to the field of charging equipment technology, and more particularly to a charging gun protection device, a charging gun, and a charging equipment. Background Technology

[0002] Rail transit vehicles have high charging power, and to meet this power demand, the charging gun cables are of large diameter. During charging, improper user operation can easily cause the charging gun cables to twist and accumulate significant torque. When the torsional stress is released, the charging gun may rotate at high speed, posing a serious personal safety hazard. Moreover, excessive cable twisting can also affect the cable's lifespan and even cause safety hazards such as electrical leakage. Summary of the Invention

[0003] The purpose of this invention is to provide a charging gun protection device, a charging gun, and a charging equipment to improve the safety and service life of the charging gun.

[0004] On one hand, the present invention provides a charging gun protection device. The charging gun includes a charging plug and a cable. The cable includes a protective tube and a plurality of wires that are all inserted in the protective tube. One end of the wire is electrically connected to the charging plug, and the other end is used to be electrically connected to the charging circuit.

[0005] The charging gun protection device includes a cable torsion detection mechanism and a torsion protection mechanism;

[0006] The cable torsion detection mechanism includes two connecting wires, a detection circuit, a normally open switch, and a power supply. Both connecting wires are housed inside the protective tube and are spirally wound around the outside of the conductor, with opposite spiral directions. One end of each connecting wire is fixedly connected to the charging plug. The two ends of the detection circuit are electrically connected to the positive and negative terminals of the power supply, respectively. The normally open switch is located within the detection circuit, and the other ends of both connecting wires are connected to the normally open switch.

[0007] The torsion protection mechanism includes an electrically controlled switch assembly, which is electrically connected to the detection line. The electrically controlled switch assembly is capable of opening when the detection line is energized and closing when the detection line is de-energized. The electrically controlled switch assembly is used to control the energization or de-energization of the charging line; or...

[0008] The torsion protection mechanism includes an alarm, which is located in the detection circuit; or,

[0009] The torsion protection mechanism includes an electronically controlled switch assembly and an alarm. The electronically controlled switch assembly is electrically connected to the detection line. The electronically controlled switch assembly can be disconnected when the detection line is energized and can be closed when the detection line is de-energized. The electronically controlled switch assembly is used to control the charging line to be energized or de-energized. The alarm is located on the detection line.

[0010] As an optional solution for the charging gun protection device, a flexible tube is provided on the outside of the connecting wire. The flexible tube is movably sleeved on the outside of the connecting wire, and both ends of the connecting wire are located on the outside of the flexible tube.

[0011] As an optional solution for the charging gun protection device, a lubricating material is provided between the outer wall of the connecting wire and the inner wall of the flexible tube.

[0012] As an optional solution for the charging gun protection device, there are two normally open switches connected in parallel; the other ends of the two connecting lines are connected to the two normally open switches one by one.

[0013] As an optional solution for the charging gun protection device, the detection circuit includes two first segments connected in parallel, and two normally open switches are respectively located on the two first segments.

[0014] The alarm is provided in two parts, and the two alarms are respectively located on the two first line segments.

[0015] As an optional solution for the charging gun protection device, the connecting wire includes a flexible wire.

[0016] As an optional solution for the charging gun protection device, the triggering torque required for the normally open switch to switch from the open state to the closed state is a; the triggering torque required for the normally open switch to switch from the closed state to the open state is b; a > b.

[0017] As an optional solution for the charging gun protection device, the electronically controlled switch assembly includes:

[0018] A normally closed switch is provided in the charging circuit; the normally closed switch includes a normally closed terminal, and the normally closed terminal is provided with a normally closed magnetic attraction part.

[0019] An electromagnetic component is disposed in the detection circuit; when the detection circuit is energized, the electromagnetic component can attract the normally closed magnetic attraction part to open the normally closed switch; when the detection circuit is de-energized, the normally closed magnetic attraction part can separate from the electromagnetic component to close the normally closed switch.

[0020] In a second aspect, the present invention provides a charging gun, including a charging gun protection device as described in any of the preceding claims.

[0021] Thirdly, the present invention provides a charging device, including the charging gun as described above.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] The charging gun protection device, charging gun, and charging equipment of the present invention, when the cable is not twisted or the degree of twist is small, the traction force of the cable on the connecting wire is insufficient to close the normally open switch. At this time, no current flows through the detection circuit, the alarm does not work, and the electronic control switch assembly remains in the closed state. The charging circuit is energized, thereby enabling the charging gun to work normally. This improves the user's flexibility in operating the charging gun while ensuring safety.

[0024] When the cable twists significantly, the connecting wire, under the pulling force of the cable, pulls the normally open switch to close. At this time, current flows through the detection circuit, triggering the alarm and activating the electronic control switch assembly. This disconnects the power to the charging circuit, physically cutting off the charging loop and stopping the charging gun. This alerts the user to tidy the cable, eliminating the safety hazard caused by the twist and protecting the cable, thus extending its lifespan. After the user tidies the cable, the pulling force on the connecting wire disappears, the normally open switch automatically opens, and no current flows through the detection circuit. This deactivates the alarm, while the electronic control switch assembly remains closed, energizing the charging circuit and restoring the charging gun to normal operation. The alarm is then automatically deactivated. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the first structure of the charging gun protection device in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the second structure of the charging gun protection device in an embodiment of the present invention.

[0027] In the picture:

[0028] 100. Cable; 101. Protective tube; 102. Conductor; 201. DC positive wire; 202. DC negative wire; 1. Cable torsion detection mechanism; 11. Connecting wire; 12. Detection circuit; 121. First segment; 13. Normally open switch; 131. Normally open body; 132. Normally open terminal; 133. Normally open magnetic component; 14. Power supply; 15. Flexible tube; 2. Torsion protection mechanism; 21. Electrically controlled switch assembly; 211. Normally closed switch; 212. Electromagnetic component; 22. Alarm. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] like Figure 1 and Figure 2 As shown, this embodiment provides a charging device, which includes a charging gun and a charging line. The charging gun includes a charging plug and a cable 100. The cable 100 includes a protective tube 101 and a plurality of wires 102 passing through the protective tube 101. One end of the wires 102 is electrically connected to the charging plug, and the other end is used to electrically connect to the charging line. Exemplarily, the charging device is a charging pile.

[0037] The charging gun also includes a charging gun protection device, which comprises a cable torsion detection mechanism 1 and a torsion protection mechanism 2. The cable torsion detection mechanism 1 includes two connecting wires 11, a detection circuit 12, a normally open switch 13, and a power supply 14. Both connecting wires 11 are located inside the protective tube 101 and are spirally wound around the outside of the conductor 102, with opposite spiral directions. One end of each connecting wire 11 is fixedly connected to the charging plug. The two ends of the detection circuit 12 are respectively connected to the power supply 14. The positive and negative terminals are electrically connected. A normally open switch 13 is located on the detection line 12, and the other ends of the two connecting lines 11 are connected to the normally open switch 13. The torsion protection mechanism 2 includes an electric control switch assembly 21 and an alarm 22. The electric control switch assembly 21 is electrically connected to the detection line 12. The electric control switch assembly 21 can be disconnected when the detection line 12 is energized, and the electric control switch assembly 21 can be closed when the detection line 12 is de-energized. The electric control switch assembly 21 is used to control the charging line to be energized or de-energized. The alarm 22 is located on the detection line 12.

[0038] In this embodiment of the charging gun protection device, when the cable 100 is not twisted or the degree of twist is small, the traction force of the cable 100 on the connecting wire 11 is insufficient to close the normally open switch 13. At this time, no current flows through the detection line 12, the alarm 22 does not work, and the electronic control switch assembly 21 remains closed. The charging line is energized, thereby enabling the charging gun to work normally. This improves the user's flexibility in operating the charging gun while ensuring safety.

[0039] When cable 100 twists significantly, the accumulated torque is substantial, indicating a dangerous twist. Connecting wire 11, under the pulling force of cable 100, pulls normally open switch 13 to close. At this point, current flows through detection circuit 12, alarm 22 activates and sounds an alarm, and electronic control switch assembly 21 disconnects, de-energizing the charging circuit. This physically cuts off the charging circuit, stopping the charging gun and reminding the user to tidy up cable 100. This eliminates the safety hazard caused by cable twisting and protects cable 100, extending its lifespan. After the user tidies up cable 100, the pulling force on connecting wire 11 disappears, normally open switch 13 automatically opens, preventing current from flowing through detection circuit 12. Alarm 22 then deactivates, and electronic control switch assembly 21 remains closed, energizing the charging circuit. The charging gun resumes normal operation, and the alarm automatically deactivates.

[0040] It should be noted that the connecting wire 11 is spirally wound around the outside of the conductor 102, which can prevent the cable 100 from deforming radially or from bending and deforming, thus preventing the connecting wire 11 from pulling the normally open switch 13 to close. In other words, it can prevent false alarms caused by non-torsional deformation of the cable 100. For example, the spiral angle of the connecting wire 11 is 45°.

[0041] Furthermore, as the degree of twisting of cable 100 increases, the cumulative torque of cable 100 also increases, and the risk factor when cable 100 releases torsional stress is higher. In this embodiment, when cable 100 twists and the torque reaches a preset torque, the connecting wire 11 pulls the normally open switch 13 to close. That is, when cable 100 twists and the torque reaches the preset torque, the electronic control switch assembly 21 and the alarm 22 are activated to prompt the user to straighten cable 100, thereby improving the safety of using the charging gun. For example, the preset torque is 20 N·m (the unit of torque is Newton-meter, symbol N·m).

[0042] In other embodiments, the torsion protection mechanism 2 may not include the electronically controlled switch assembly 21. That is, when the cable torsion detection mechanism 1 detects a torsion in the cable 100, the charging protection device issues an alarm via the alarm 22 to prompt the user to straighten the cable 100, thereby preventing safety hazards. Alternatively, the torsion protection mechanism 2 may not include the alarm 22. That is, when the cable torsion detection mechanism 1 detects a torsion in the cable 100, the charging protection device controls the charging line to disconnect power via the electronically controlled switch assembly 21, thereby interrupting charging and preventing safety hazards.

[0043] It should be noted that the charging circuit includes charging cables (such as DC cables, where DC stands for direct current) and signal cables. The charging cables are used to charge the batteries of vehicles and other electrical devices, while the signal cables are used for communication between the charging equipment and the vehicles or other electrical devices. For example, the signal cables include low-voltage signal cables, CP cables (control pilot cables, used for charging control), and CC cables (charging connection confirmation cables, used for connection detection). The connection methods and working principles of the low-voltage signal cables, CP cables, and CC cables are existing technologies and will not be elaborated upon here.

[0044] In other words, the electronic control switch assembly 21 can be located on the charging line, thereby directly cutting off the main charging circuit. The electronic control switch assembly 21 can also be located on the signal line, which can also prevent the charging gun from charging normally by interfering with or cutting off the communication signal.

[0045] In some embodiments, the power supply 14 serves as an auxiliary power source for the charging station. Of course, the power supply 14 can also be a built-in battery such as a button cell battery.

[0046] In some embodiments, the alarm 22 includes a warning light, that is, to alert the user by means of light. Of course, the alarm 22 may also include a buzzer, for example, to alert the user by sound. The alarm 22 may also include a combined sound and light alarm, thereby alerting the user simultaneously by means of both sound and light.

[0047] In some embodiments, the connecting wire 11 includes a flexible wire. When the cable 100 twists slightly, the flexible wire can undergo a certain elastic deformation as the cable 100 twists, thereby applying a tensile force to the normally open switch 13, but this tensile force is insufficient to close the normally open switch 13. When the cable 100 twists significantly, the flexible wire can generate a sufficiently large elastic deformation and apply a sufficiently large tensile force to the normally open switch 13 to cause it to close. By employing a flexible wire, the user's flexibility in operating the charging gun can be maximized while ensuring safety.

[0048] It should be noted that the elastic thread has a long service life, anti-aging properties, and fatigue resistance. For example, the elastic thread can be made of shot-peened reinforced elastic steel wire, piano wire, or high-strength polymer fiber, as is available in the prior art.

[0049] It should be noted that the material, diameter, length, and elasticity of the connecting cable 11 can be selected according to specific needs, and are not limited here.

[0050] In some embodiments, a flexible tube 15 is provided on the outside of the connecting line 11. The flexible tube 15 is movably sleeved on the outside of the connecting line 11, and both ends of the connecting line 11 are located on the outside of the flexible tube 15. Thus, the flexible tube 15 can protect the connecting line 11 and improve the service life of the connecting line 11.

[0051] In some embodiments, a lubricating material is provided between the outer wall of the connecting wire 11 and the inner wall of the flexible tube 15, thereby enabling the connecting wire 11 to move more smoothly within the flexible tube 15. This helps to improve the accuracy of cable 100 torsion detection, thereby improving the sensitivity of the charging gun protection device and enhancing the protection effect on the charging gun.

[0052] Specifically, the lubricating material is directly filled into the flexible tube 15. For example, the lubricating material is a solid lubricant.

[0053] In other embodiments, the lubricating material may also be a lubricating coating in the prior art, for example, the lubricating coating may be applied to the inner wall of the flexible tube 15 to form a lubricating layer, or the lubricating coating may be applied to the outer wall of the connecting wire 11 to form a lubricating layer.

[0054] It should be noted that during the use of the charging gun, the cable may twist in either a clockwise or counterclockwise direction. Since the two connecting wires 11 have opposite spiral directions, the twisting of the cable 100 in both clockwise and counterclockwise directions can be detected through the two connecting wires 11 respectively, and the detection accuracy is higher.

[0055] In some embodiments, there are two normally open switches 13 connected in parallel; the other ends of the two connecting lines 11 are connected to the two normally open switches 13 in a one-to-one correspondence, so that the tension generated by the two connecting lines 11 can be detected more accurately through the two normally open switches 13, thereby improving the detection accuracy of the cable 100 twisting in the clockwise and counterclockwise directions.

[0056] In some embodiments, the detection line 12 includes two first segments 121 connected in parallel, and two normally open switches 13 are correspondingly disposed on the two first segments 121. Further, two alarms 22 are provided, correspondingly disposed on the two first segments 121. The two alarms 22 can then provide alarms for clockwise and counterclockwise twisting of the cable 100, respectively, allowing the user to accurately identify the twisting direction of the cable 100. This enables quick and accurate cable tidying, improving charging convenience and user experience.

[0057] In some embodiments, the triggering torque required for the normally open switch 13 to switch from the open state to the closed state is a; the triggering torque required for the normally open switch 13 to switch from the closed state to the open state is b; a > b, thereby enabling the normally open switch 13 to have a hysteresis performance, which can prevent the normally open switch 13 from bouncing in the critical state and improve the alarm stability.

[0058] In some embodiments, the electronically controlled switch assembly 21 includes a normally closed switch 211 and an electromagnetic component 212. The normally closed switch 211 is located in the charging circuit; the normally closed switch 211 has a normally closed terminal, and the normally closed terminal has a normally closed magnetic attraction part; the electromagnetic component 212 is located in the detection circuit 12; when the detection circuit 12 is energized, the electromagnetic component 212 can attract the normally closed magnetic attraction part to open the normally closed switch 211; when the detection circuit 12 is de-energized, the normally closed magnetic attraction part can separate from the electromagnetic component 212 to close the normally closed switch 211. This configuration is not only simple in structure and low in cost, but also highly reliable.

[0059] It is understood that the charging cable includes a DC positive wire 201 and a DC negative wire 202. In this embodiment, two normally closed switches 211 are provided, and the two normally closed switches 211 are respectively located on the DC positive wire 201 and the DC negative wire 202. That is to say, the electromagnetic component 212 can be attracted or separated from the normally closed magnetic attraction part of the two normally closed switches 211.

[0060] Specifically, the normally closed switch 211 also includes a normally closed body and a normally closed magnetic component. The normally closed magnetic component engages with the normally closed magnetic attraction part, keeping the normally closed terminal in contact with the contacts of the normally closed body, thereby keeping the normally closed switch 211 closed. When the detection circuit 12 is energized, the magnetic force exerted by the electromagnetic component 212 on the normally closed magnetic attraction part is greater than the magnetic force exerted by the normally closed magnetic component on the normally closed magnetic attraction part, causing the normally closed magnetic attraction part to engage with the electromagnetic component 212, and the normally closed magnetic attraction part to separate from the normally closed magnetic component, thus separating the normally closed terminal from the contacts of the normally closed body, thereby opening the normally closed switch 211. As an alternative, a normally closed elastic component can be used instead of the normally closed magnetic component. Under the elastic force generated by the normally closed elastic component, the normally closed terminal remains in contact with the contacts of the normally closed body, thereby keeping the normally closed switch 211 closed. When the detection circuit 12 is energized, the magnetic force exerted by the electromagnetic component 212 on the normally closed magnetic attracting part is greater than the elastic force exerted by the normally closed elastic component on the normally closed terminal, causing the normally closed magnetic attracting part to engage with the electromagnetic component 212. This causes the normally closed terminal to separate from the normally closed body's contacts, thereby opening the normally closed switch 211. For example, the normally closed elastic component is an elastic spring, such as a phosphor bronze sheet, which has a long service life and high reliability.

[0061] In some embodiments, the normally open switch 13 includes a normally open body 131, a normally open terminal 132, and a normally open magnetic element 133. The normally open terminal 132 is movably disposed on the normally open body 131, and the normally open magnetic element 133 is disposed on one side of the normally open body 131. The normally open terminal 132 has a normally open magnetic attraction part, which can attract the normally open magnetic element 133 to separate the normally open terminal 132 from the contacts of the normally open body 131, thereby putting the normally open switch 13 in an open state. The connecting wire 11 is connected to the normally open magnetic attraction part. When the cable 100 undergoes a dangerous twist, the connecting wire 11 pulls the normally open terminal 132 and overcomes the magnetic force of the normally open magnetic element 133, causing the normally open magnetic attraction part to separate from the normally open magnetic element 133, so that the normally open terminal 132 contacts the contacts of the normally open body 131, thereby putting the normally open switch 13 in a closed state. In other words, the normally open switch 13 is a magnetic normally open switch, which is not only simple in structure and low in cost, but also has a long service life.

[0062] In other embodiments, the normally open switch 13 includes a normally open body 131, a normally open terminal 132, and a normally open elastic element. The normally open terminal 132 is movably disposed on the normally open body 131, and the normally open elastic element is configured to ensure that the normally open terminal 132 always has a tendency to separate from the normally open body 131. That is, under the elastic force generated by the normally open elastic element, the normally open terminal 132 separates from the contacts of the normally open body 131, and the normally open switch 13 is in the open state. When the cable 100 undergoes a dangerous twist, the connecting wire 11 pulls the normally open terminal 132 and overcomes the elastic force of the normally open elastic element, so that the normally open terminal 132 contacts the contacts of the normally open body 131, thereby closing the normally open switch 13. Exemplarily, the normally open elastic element is an elastic spring, such as a phosphor bronze sheet, which has a long service life and high reliability.

[0063] The charging gun protection device in this embodiment can promptly issue an alarm when the cable 100 twists, effectively alerting the user to potential safety risks and prompting the user to actively tidy up the cable 100. Simultaneously with the alarm, the charging gun is stopped via the electronic control switch assembly 21, physically isolating the risk and forcibly preventing the charging gun from continuing to charge in a dangerous state, significantly improving charging safety. Furthermore, both the cable twist detection mechanism 1 and the twist protection mechanism 2 are hardware-based, operating independently without relying on the charging control system of the charging equipment, resulting in higher compatibility. They also do not require wireless signal transmission, exhibiting strong resistance to electromagnetic interference and a simple structure, which helps reduce costs. When the cable 100 does not undergo dangerous twisting, there is no current in the detection circuit 12, achieving zero standby power consumption.

[0064] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A charging gun protection device, characterized in that, The charging gun includes a charging plug and a cable (100). The cable (100) includes a protective tube (101) and a plurality of wires (102) that are all inserted in the protective tube (101). One end of the wire (102) is electrically connected to the charging plug, and the other end is used to be electrically connected to the charging circuit. The charging gun protection device includes a cable torsion detection mechanism (1) and a torsion protection mechanism (2); The cable torsion detection mechanism (1) includes two connecting wires (11), a detection circuit (12), a normally open switch (13), and a power supply (14). The two connecting wires (11) are both located inside the protective tube (101). The two connecting wires (11) are spirally wound around the outside of the conductor (102), and the spiral directions of the two connecting wires (11) are opposite. One end of each of the two connecting wires (11) is fixedly connected to the charging plug. The two ends of the detection circuit (12) are electrically connected to the positive and negative terminals of the power supply (14), respectively. The normally open switch (13) is located on the detection circuit (12), and the other ends of the two connecting wires (11) are connected to the normally open switch (13). The torsion protection mechanism (2) includes an electronically controlled switch assembly (21), which is electrically connected to the detection line (12). The electronically controlled switch assembly (21) can disconnect when the detection line (12) is energized, and can close when the detection line (12) is de-energized. The electronically controlled switch assembly (21) is used to control the charging line to be energized or de-energized; or, The torsion protection mechanism (2) includes an alarm (22), which is located on the detection line (12); or, The torsion protection mechanism (2) includes an electronically controlled switch assembly (21) and an alarm (22). The electronically controlled switch assembly (21) is electrically connected to the detection line (12). The electronically controlled switch assembly (21) can be disconnected when the detection line (12) is energized, and the electronically controlled switch assembly (21) can be closed when the detection line (12) is de-energized. The electronically controlled switch assembly (21) is used to control the charging line to be energized or de-energized. The alarm (22) is located on the detection line (12). A flexible tube (15) is provided on the outside of the connecting line (11). The flexible tube (15) is movably sleeved on the outside of the connecting line (11). Both ends of the connecting line (11) are located on the outside of the flexible tube (15). There are two normally open switches (13), and the two normally open switches (13) are connected in parallel; the other ends of the two connecting lines (11) are connected to the two normally open switches (13) one by one; The detection line (12) includes two first segments (121), which are connected in parallel, and two normally open switches (13) are respectively located on the two first segments (121); There are two alarms (22), and the two alarms (22) are respectively located on the two first line segments (121); The electronically controlled switch assembly (21) includes a normally closed switch (211) and an electromagnetic component (212). The normally closed switch (211) is disposed on the charging circuit. The normally closed switch (211) includes a normally closed terminal, and the normally closed terminal is provided with a normally closed magnetic attraction part. The electromagnetic component (212) is disposed on the detection circuit (12). When the detection circuit (12) is energized, the electromagnetic component (212) can attract the normally closed magnetic attraction part to open the normally closed switch (211). When the detection circuit (12) is de-energized, the normally closed magnetic attraction part can separate from the electromagnetic component (212) to close the normally closed switch (211).

2. The charging gun protection device according to claim 1, characterized in that, A lubricating material is provided between the outer wall of the connecting line (11) and the inner wall of the flexible tube (15).

3. The charging gun protection device according to claim 1 or 2, characterized in that, The connecting line (11) includes an elastic line.

4. The charging gun protection device according to claim 1 or 2, characterized in that, The triggering torque required for the normally open switch (13) to switch from the open state to the closed state is a; the triggering torque required for the normally open switch (13) to switch from the closed state to the open state is b; a > b.

5. A charging gun, characterized in that, Includes the charging gun protection device as described in any one of claims 1-4.

6. A charging device, characterized in that, Includes the charging gun as described in claim 5.

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