Electric vehicle charging gun based on fingerprint identification

Abstract

The invention discloses an electric vehicle charging gun based on fingerprint recognition, and belongs to the technical field of charging guns, the electric vehicle charging gun comprises a shell, a gun head protection mechanism and a gun body heat dissipation mechanism, the gun head protection mechanism for protecting a charging gun head is installed on the front side of the shell, and the gun body heat dissipation mechanism is installed on the front side of the shell. A gun body heat dissipation mechanism for conducting heat dissipation on the gun body and the gun head is installed in the shell, the gun head protection mechanism comprises a pressing limiting mechanism and a linkage telescopic mechanism, and the upper side of the shell is provided with a pressing limiting mechanism capable of conducting fingerprint recognition and pressing locking and unlocking of the charging gun. The front side of the shell is provided with a linkage telescopic mechanism which carries out automatic telescopic protection on the gun head when the charging gun is pulled out and inserted. In this way, during charging, the charging gun can be automatically unlocked through fingerprints, meanwhile, the hollow cylindrical protection frame is taken back, the charging gun is pulled out, the charging gun is automatically unlocked, meanwhile, the hollow cylindrical protection frame is popped out to protect the gun head, and circulating cooling can be conducted on the gun head and the gun body.

Description

Technical Field

[0001] This invention relates to the field of charging gun technology, specifically to an electric vehicle charging gun based on fingerprint recognition. Background Technology

[0002] Electric vehicle charging guns are devices used to charge electric vehicles. After prolonged use, the plastic part at the front of the charging gun head is easily damaged due to daily bumps and knocks. This can cause the charging head to be difficult to insert or to wobble during insertion, affecting the stability of charging and causing intermittent charging. In severe cases, poor contact can lead to increased resistance, overheating, and other safety hazards such as fires. During the charging process, the charging gun operates for a long time with continuous internal current. Due to the Joule heating effect, a large amount of heat is generated in the charging head, especially in the area where the metal contact terminals connect to the cable. In hot weather, this further exacerbates the temperature rise of the charging head and cable. Users are very likely to be burned when pulling out the charging gun, seriously affecting the user experience. Burns may even lead to operational errors, resulting in damage to the charging gun or other accidents.

[0003] Chinese patent CN220963964U discloses a charging gun for a fingerprint recognition device, comprising a charging gun body, a mounting hole on one side of the charging gun body, a sleeve rotatably connected to the inner side of the mounting hole, a sliding groove on the outer side of the sleeve, a movable block slidably connected to the inner side of the sleeve, a fingerprint recognition module fixed to one side of the movable block, two guide rods slidably connected inside the movable block, a mounting plate fixed to one end of each guide rod, two fixing rods fixed to the outer circumference of the mounting plate, a motor fixed to the side of the mounting plate away from the sleeve, the output end of the motor penetrating the interior of the mounting plate and coaxially fixed to a lead screw, a slider fixed to the outer side of the movable block, two connecting rods fixed to the outer side of the sleeve, an inclined groove on the outer side of each connecting rod, a connecting block slidably connected to the inner side of the inclined groove, a baffle fixed to one end of the connecting block, a guide rail slidably connected inside the baffle, the sliding groove having a spiral structure, and one end of the fixing rod being fixedly connected to the inner wall of the charging gun body.

[0004] However, the technical solution of this patent has the following problems: The patented technology allows the charging gun to automatically unlock with fingerprint when it cannot be charged, while simultaneously retracting the protective device. When the charging gun cannot be pulled out, it automatically unlocks and simultaneously deploys the protective device to protect the gun head.

[0005] Based on this, the present invention designs an electric vehicle charging gun based on fingerprint recognition to solve the above problems. Summary of the Invention

[0006] In view of the above-mentioned shortcomings of the existing technology, the present invention provides an electric vehicle charging gun based on fingerprint recognition.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A fingerprint recognition-based electric vehicle charging gun includes a housing, and further includes a gun head protection mechanism and a gun body heat dissipation mechanism. The gun head protection mechanism is installed on the front side of the housing to protect the charging gun head, and the gun body heat dissipation mechanism is installed inside the housing to dissipate heat from the gun body and the gun head. The gun head protection mechanism includes a pressing limit mechanism and a linkage telescopic mechanism. The upper side of the housing is equipped with a pressing limit mechanism that can perform fingerprint recognition for pressing to lock and unlock the charging gun. The front side of the housing is equipped with a linkage telescopic mechanism that automatically extends and retracts to protect the gun head when the charging gun is plugged in or out.

[0008] Furthermore, the pressing limiting mechanism includes: a pressing unlocking component, a fingerprint recognition component, and a mechanical limiting component. The pressing unlocking component is installed on the upper side of the housing, the fingerprint recognition component is installed on the pressing unlocking component, and the mechanical limiting component is installed inside the housing.

[0009] Furthermore, the press-to-unlock component includes: a rotating bar, a first torsion spring, and a buckle. The rotating bar is rotatably connected to the upper side of the housing via a rotating shaft. The first torsion spring is sleeved on the rotating shaft of the rotating bar. One end of the first torsion spring is fixedly connected to the rotating bar, and the other end of the first torsion spring is fixedly connected to the housing. The buckle is fixedly installed on the front side of the rotating bar.

[0010] Furthermore, the mechanical limiting assembly includes a small electric telescopic rod and a limiting plate, wherein the small electric telescopic rod is fixedly installed inside the housing, and the limiting plate is fixedly installed at the output end of the small electric telescopic rod.

[0011] Furthermore, the linkage telescopic mechanism includes: an elastic telescopic component and a linkage component, wherein the elastic telescopic component is installed on the front side inside the housing, and the linkage component is installed on the rear side inside the housing.

[0012] Furthermore, the elastic telescopic component includes: a hollow cylindrical protective frame, a limiting ring, and a first spring. The hollow cylindrical protective frame is slidably connected to the front side of the housing, the limiting ring is fixedly installed on the rear side of the hollow cylindrical protective frame, and the first spring is sleeved inside the housing. One end of the first spring is in close contact with the rear side of the hollow cylindrical protective frame, and the other end of the first spring is in close contact with the housing.

[0013] Furthermore, the hollow cylindrical protective frame has two symmetrical rectangular openings on both the left and right sides.

[0014] Furthermore, the linkage assembly includes: an L-shaped plate, a guide rod, a C-shaped sliding frame, a second spring, and a first guide wheel. The two L-shaped plates are symmetrically distributed on the left and right sides inside the housing. The L-shaped plates are rotatably connected to the housing via a rotating shaft. A second torsion spring is sleeved on the rotating shaft of the L-shaped plate. One end of the second torsion spring is fixedly connected to the L-shaped plate, and the other end is fixedly connected to the housing. Multiple guide rods are fixedly installed on the rear side inside the housing. The C-shaped sliding frame is slidably connected to the guide rod. The end of the C-shaped sliding frame near the two L-shaped plates is rotatably connected to a second guide wheel via a rotating shaft. The second guide wheel is in close contact with the side wall of the L-shaped plate away from the center of the hollow cylindrical protective frame. A limit frame is fixedly installed on the rear side of the C-shaped sliding frame. The end of the limit plate away from the small electric telescopic rod is in close contact with the limit frame. The second spring is sleeved on the guide rod. One end of the second spring is in close contact with the housing, and the other end is in close contact with the C-shaped sliding frame. The first guide wheel is rotatably connected to the lower rear side of the rotating bar via a rotating shaft. The first guide wheel is located inside the limit frame.

[0015] Furthermore, the front end of the L-shaped plate is located within a rectangular opening.

[0016] Furthermore, the gun body heat dissipation mechanism includes: a gun head, heat dissipation pipes, a radiator, a water pump, a water tank, and fans. The gun head is fixedly installed on the front side of the housing. The heat dissipation pipes are distributed in an S-shape on the rear side of the gun head. The radiator is located inside the charging cabinet. The water pump is fixedly installed on one side of the radiator. The water tank is fixedly installed on one side of the radiator. Two water outlets are fixedly installed on the water tank. One water outlet is connected to the water pump input end through a pipe, and the other water outlet is connected to the radiator output end through a pipe. Multiple fans are fixedly installed on the radiator. One end of the heat dissipation pipe is connected to the water pump output end through a pipe, and the other end of the heat dissipation pipe is connected to the radiator input end through a pipe.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention uses a fingerprint module to transmit an electrical signal, which is detected by an external controller. This controller then controls the output end of a small electric telescopic rod to shorten, causing the limiting plate to move away from the limiting frame to release the limit. Subsequently, pressing the fingerprint module can drive the rotating bar to rotate, which on the one hand moves the buckle upward to unlock the charging gun, and on the other hand moves the first guide wheel, causing the limiting frame, C-shaped sliding frame, and second guide wheel to move forward in sequence. This, in turn, drives the L-shaped plate to rotate and unlock the hollow cylindrical protective frame. At this time, the charging gun is inserted into the car charging port, and the hollow cylindrical protective frame is pushed back into the housing. After releasing the fingerprint module, the first torsion spring returns to its original position, causing the rotating bar to return to its original position, and the first guide wheel to reset. When the limiting frame loses its support, the first spring returns to its original position, pushing the limiting frame, C-shaped sliding frame, and second guide wheel back to their original positions in sequence. The L-shaped plate returns to its original position under the action of the second torsion spring and locks the hollow cylindrical protective frame. The rotation of the rotating bar also causes the buckle to move down and lock the charging gun. When the gun is pulled out, pressing the fingerprint module causes the rotating bar to rotate, causing the buckle to move up and unlock the charging gun. At the same time, the first guide wheel moves to open the L-shaped plate and unlock the hollow cylindrical protective frame. After the charging gun is pulled out, the first spring returns to its original position and pops the hollow cylindrical protective frame out of the shell. This is conducive to realizing the function of automatically unlocking the charging gun with fingerprint while retracting the hollow cylindrical protective frame during charging. When the charging gun is pulled out, the charging gun is automatically unlocked and the hollow cylindrical protective frame pops out to protect the gun head. 2. When charging a car via the charging gun, the external controller starts the water pump to pump water from the water tank into the cooling pipe. The cooling pipe cools the gun head, and the hot water in the cooling pipe enters the radiator. The external controller controls the fan to rotate and cool the water in the radiator. After the water in the radiator is cooled, it re-enters the water tank, realizing a water-cooled circulation for the gun head. At the same time, it assists in cooling the gun head, which helps to reduce the temperature of the gun head and thus the temperature of the casing, preventing the user from being burned when pulling out the charging gun. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a schematic diagram of the present invention with part of the gun body heat dissipation mechanism removed; Figure 4 This is a schematic diagram of the gun head protection mechanism of the present invention with some parts removed; Figure 5 for Figure 4 Enlarged view of A in the middle; Figure 6 The three-dimensional structure of the gun head protection mechanism of the present invention with a portion removed Figure 1 ; Figure 7 for Figure 6 Enlarged view of B in the middle; Figure 8 The three-dimensional structure of the gun head protection mechanism of the present invention with a portion removed Figure 2 ; Figure 9 This is a schematic diagram of the heat dissipation pipes and part of the housing of the present invention; Figure 10 This is a schematic diagram of the heat dissipation pipe of the present invention.

[0020] The labels in the diagram represent: 1. Shell; 2. Gun head protection mechanism; 21. Rotating bar; 22. First torsion spring; 23. Buckle; 24. Fingerprint module; 25. Small electric telescopic rod; 26. Limiting plate; 27. Hollow cylindrical protective frame; 28. Limiting ring; 29. ​​First spring; 210. Rectangular opening; 211. L-shaped plate; 212. Guide rod; 213. C-shaped sliding frame; 214. Second spring; 215. First guide wheel; 216. Limiting frame; 217. Second guide wheel; 3. Gun body heat dissipation mechanism; 31. Gun head; 32. Heat dissipation pipe; 33. Cooling radiator; 34. Water pump; 35. Water tank; 36. Fan; 37. Water outlet. Detailed Implementation

[0021] 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, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] The present invention will be further described below with reference to embodiments.

[0023] The terms "left," "right," "front," "back," "up," and "down" used in the following description refer to the orientation from the perspective of the front view.

[0024] Example 1: In some examples, please refer to Figures 1-10 A fingerprint recognition-based electric vehicle charging gun includes a housing 1, and further includes a gun head protection mechanism 2 and a gun body heat dissipation mechanism 3. The gun head protection mechanism 2 is installed on the front side of the housing 1 to protect the charging gun head 31, and the gun body heat dissipation mechanism 3 is installed inside the housing 1 to dissipate heat from the gun body and the gun head 31.

[0025] like Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown, the gun head protection mechanism 2 includes a pressing limit mechanism and a linkage telescopic mechanism. The upper side of the housing 1 is equipped with a pressing limit mechanism that can perform fingerprint recognition to lock and unlock the charging gun. The front side of the housing 1 is equipped with a linkage telescopic mechanism that automatically extends and retracts to protect the gun head 31 when the charging gun is plugged in or out.

[0026] The pressing and limiting mechanism includes a pressing and unlocking component, a fingerprint recognition component, and a mechanical limiting component. The pressing and unlocking component is installed on the upper side of the housing 1, the fingerprint recognition component is installed on the pressing and unlocking component, and the mechanical limiting component is installed inside the housing 1.

[0027] The fingerprint recognition component performs fingerprint recognition. After the fingerprint is successfully recognized, the external controller controls the mechanical limit component to release the limit on the linkage telescopic mechanism, so that the press-to-unlock component can be pressed to unlock. This allows the linkage telescopic mechanism and the press-to-unlock component to work together and unlock normally. Conversely, the press-to-unlock component will not be able to unlock, preventing the device from being used by others.

[0028] The press-to-unlock assembly includes a rotating bar 21, a first torsion spring 22, and a buckle 23. The rotating bar 21 is rotatably connected to the upper side of the housing 1 via a rotating shaft. The first torsion spring 22 is sleeved on the rotating shaft of the rotating bar 21. One end of the first torsion spring 22 is fixedly connected to the rotating bar 21, and the other end of the first torsion spring 22 is fixedly connected to the housing 1. The buckle 23 is fixedly installed on the front side of the rotating bar 21.

[0029] The fingerprint recognition component includes a fingerprint module 24, which is fixedly installed on the upper rear side of the rotating bar 21.

[0030] The mechanical limiting assembly includes a small electric telescopic rod 25 and a limiting plate 26. The small electric telescopic rod 25 is fixedly installed inside the housing 1, and the limiting plate 26 is fixedly installed at the output end of the small electric telescopic rod 25.

[0031] The linkage telescopic mechanism includes: an elastic telescopic component and a linkage component. The elastic telescopic component is installed inside the front side of the housing 1, and the linkage component is installed inside the rear side of the housing 1.

[0032] The elastic telescopic component includes: a hollow cylindrical protective frame 27, a limiting ring 28, and a first spring 29. The hollow cylindrical protective frame 27 is slidably connected to the front side of the housing 1, and the limiting ring 28 is fixedly installed on the rear side of the hollow cylindrical protective frame 27. Two rectangular openings 210 are provided on both the left and right sides of the hollow cylindrical protective frame 27. The first spring 29 is sleeved inside the housing 1, with one end of the first spring 29 tightly attached to the rear side of the hollow cylindrical protective frame 27 and the other end of the first spring 29 tightly attached to the housing 1.

[0033] The linkage assembly includes: an L-shaped plate 211, guide rods 212, a C-shaped sliding frame 213, a second spring 214, and a first guide wheel 215. Two L-shaped plates 211 are symmetrically distributed on the left and right sides inside the housing 1. The L-shaped plates 211 are rotatably connected to the housing 1 via a rotating shaft. A second torsion spring is sleeved on the rotating shaft of the L-shaped plate 211. One end of the second torsion spring is fixedly connected to the L-shaped plate 211, and the other end is fixedly connected to the housing 1. Multiple guide rods 212 are fixedly installed inside the rear side of the housing 1. The C-shaped sliding frame 213 is slidably connected to the guide rods 212. The C-shaped sliding frame 213 is close to the two guide rods 214. One side of the L-shaped plate 211 is rotatably connected to a second guide wheel 217 via a rotating shaft. The second guide wheel 217 is in close contact with the side wall of the L-shaped plate 211 away from the center of the hollow cylindrical protective frame 27. A limit frame 216 is fixedly installed on the rear side of the C-shaped sliding frame 213. The end of the limit plate 26 away from the small electric telescopic rod 25 is in close contact with the limit frame 216. The second spring 214 is sleeved on the guide rod 212. One end of the second spring 214 is in close contact with the housing 1, and the other end of the second spring 214 is in close contact with the C-shaped sliding frame 213. The first guide wheel 215 is rotatably connected to the lower rear side of the rotating bar 21 via a rotating shaft. The first guide wheel 215 is located inside the limit frame 216.

[0034] When the charging gun is inserted into the car's charging port, place your finger on the fingerprint module 24 and press the fingerprint module 24. The fingerprint module 24 transmits an electrical signal to the external controller. When the external controller detects that the electrical signal is correct, it controls the output end of the small electric telescopic rod 25 to shorten. The shortening of the output end of the small electric telescopic rod 25 causes the limiting plate 26 to move away from the limiting frame 216, so that the limiting frame 216 is released from the limit. At this time, pressing the fingerprint module 24 causes the rotating bar 21 to rotate. The rotation of the rotating bar 21 causes the buckle 23 to move upward to unlock the charging gun. At the same time, the first torsion spring 22 undergoes elastic deformation.

[0035] The rotation of the rotating bar 21 drives the first guide wheel 215 to move. The movement of the first guide wheel 215 drives the limiting frame 216 to move forward. The movement of the limiting frame 216 drives the C-shaped sliding frame 213 to move forward. The movement of the C-shaped sliding frame 213 drives the second guide wheel 217 to move forward. The movement of the second guide wheel 217 drives the L-shaped plate 211 to rotate. The rotation of the L-shaped plate 211 unlocks the hollow cylindrical protective frame 27. At this time, when the charging gun is inserted into the car charging port, the hollow cylindrical protective frame 27 is pushed back into the housing 1, and the first spring 29 undergoes elastic deformation and is compressed.

[0036] After the charging gun is inserted into the car's charging port, the fingerprint module 24 is released. The first torsion spring 22, which has undergone elastic deformation, returns to its original state and pushes the rotating bar 21 back to its initial state. The rotating bar 21's return to its initial state causes the first guide wheel 215 to move to its initial state, and the limiting frame 216 loses the support force of the first guide wheel 215. The first spring 29, which has undergone elastic deformation, returns to its original state and pushes the limiting frame 216 back to its initial state. The limiting frame 216's return to its initial state causes the C-shaped sliding frame 213 to return to its initial state, and the C-shaped sliding frame 213's return to its initial state causes the second guide wheel 217 to return to its initial state. The L-shaped plate 211 loses the pushing force of the second guide wheel 217, and the second torsion spring, which has undergone elastic deformation, returns to its original state and pushes the L-shaped plate 211 back to its initial state, locking the hollow cylindrical protective frame 27. The rotating bar 21 rotates, causing the buckle 23 to move downward to lock the charging gun.

[0037] When the charging gun is pulled out, a finger is placed on the fingerprint module 24 and pressed simultaneously. The fingerprint module 24 drives the rotating bar 21 to rotate, which in turn moves the latch 23 upward to unlock the charging gun. The rotation of the rotating bar 21 also moves the first guide wheel 215, opening the L-shaped plate 211 and unlocking the hollow cylindrical protective frame 27. After the gun is unlocked and pulled out, the first spring 29, which has undergone elastic deformation, returns to its original state and ejects the hollow cylindrical protective frame 27 from the housing 1, covering the charging gun head 31 for protection. The limiting ring 28 limits the hollow cylindrical protective frame 27 to prevent it from ejecting from the housing 1. This achieves automatic fingerprint unlocking of the charging gun and the hollow cylindrical protective frame 27 during charging, and automatic unlocking of the charging gun and ejection of the hollow cylindrical protective frame 27 to protect the gun head 31 when the charging gun is pulled out.

[0038] Example 2: In some embodiments, such as Figures 1-10As shown in the preferred embodiment of the present invention, the gun body heat dissipation mechanism 3 includes: a gun head 31, a heat dissipation pipe 32, a radiator 33, a water pump 34, a water tank 35, and a fan 36. The gun head 31 is fixedly installed on the front side of the housing 1. The heat dissipation pipe 32 is distributed in an S-shape on the rear side of the gun head 31. The radiator 33 is located inside the charging cabinet. The water pump 34 is fixedly installed on one side of the radiator 33. The water tank 35 is fixedly installed on one side of the radiator 33. Two water outlets 37 are fixedly installed on the water tank 35. One water outlet 37 is connected to the input end of the water pump 34 through a pipe, and the other water outlet 37 is connected to the output end of the radiator 33 through a pipe. Multiple fans 36 are fixedly installed on the radiator 33. One end of the heat dissipation pipe 32 is connected to the output end of the water pump 34 through a pipe, and the other end of the heat dissipation pipe 32 is connected to the input end of the radiator 33 through a pipe.

[0039] like Figure 1 , Figure 2 As shown, when the charging gun is charging a car, the external controller controls the water pump 34 to start, pumping water from the water tank 35 into the cooling pipe 32. The cooling pipe 32 cools the gun head 31, and the hot water in the cooling pipe 32 enters the radiator 33. The external controller controls the fan 36 to rotate and cool the water in the radiator 33. After the water in the radiator 33 is cooled, it re-enters the water tank 35, realizing the water-cooling cycle of the gun head 31. At the same time, it assists in cooling the gun head, which helps to reduce the temperature of the gun head 31 and thus reduce the temperature of the casing 1, preventing the user from being burned when pulling out the charging gun.

[0040] The fingerprint module 24, the small electric telescopic rod 25, the water pump 34, and the fan 36 are all electrically connected to an external controller.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fingerprint recognition based electric vehicle charging gun comprising a housing (1), characterized in that, Also includes: The shell (1) is provided with a gun head protection mechanism (2) for protecting the charging gun, and a gun body heat dissipation mechanism (3) is installed in the shell (1) for dissipating heat from the gun body; The gun head protection mechanism (2) comprises: a pressing limiting mechanism and a linkage telescopic mechanism, the pressing limiting mechanism for fingerprint identification is installed on the upper side of the shell (1), and the linkage telescopic mechanism for automatic telescopic protection when the charging gun is inserted or pulled out is installed on the front side of the shell (1).

2. The fingerprint recognition based electric vehicle charging gun according to claim 1, characterized in that, The pressing limiting mechanism comprises: a pressing unlocking assembly, a fingerprint identification assembly and a mechanical limiting assembly, the pressing unlocking assembly is installed on the upper side of the shell (1), the fingerprint identification assembly is installed on the pressing unlocking assembly, and the mechanical limiting assembly is installed in the shell (1).

3. The fingerprint recognition based electric vehicle charging gun according to claim 2, characterized in that, The pressing unlocking assembly comprises: a rotating bar (21), a first torsional spring (22) and a buckle (23), the rotating bar (21) is rotatably connected to the upper side of the shell (1) through a rotating shaft, the first torsional spring (22) is sleeved on the rotating shaft of the rotating bar (21), one end of the first torsional spring (22) is fixedly connected to the rotating bar (21), the other end of the first torsional spring (22) is fixedly connected to the shell (1), and the buckle (23) is fixedly installed on the front side of the rotating bar (21).

4. The fingerprint recognition based electric vehicle charging gun according to claim 3, characterized in that, The mechanical limiting assembly comprises: a small electric telescopic rod (25) and a limiting plate (26), the small electric telescopic rod (25) is fixedly installed in the shell (1), and the limiting plate (26) is fixedly installed on the output end of the small electric telescopic rod (25).

5. The fingerprint recognition based electric vehicle charging gun according to claim 4, characterized in that, The linkage telescopic mechanism comprises: an elastic telescopic assembly and a linkage assembly, the elastic telescopic assembly is installed on the inner front side of the shell (1), and the linkage assembly is installed on the inner rear side of the shell (1).

6. The fingerprint recognition based electric vehicle charging gun according to claim 5, characterized in that, The elastic telescopic assembly comprises: a hollow cylindrical protection frame (27), a limiting ring (28) and a first spring (29), the hollow cylindrical protection frame (27) is slidably connected to the front side of the shell (1), the limiting ring (28) is fixedly installed on the rear side of the hollow cylindrical protection frame (27), the first spring (29) is sleeved in the shell (1), one end of the first spring (29) abuts against the rear side of the hollow cylindrical protection frame (27), and the other end of the first spring (29) abuts against the shell (1).

7. The fingerprint recognition based electric vehicle charging gun according to claim 6, characterized in that, The hollow cylindrical protection frame (27) is provided with two left-right symmetrical rectangular holes (210) on the left and right sides.

8. The fingerprint recognition based electric vehicle charging gun according to claim 7, characterized in that, The linkage assembly comprises L-shaped plates (211), guide rods (212), C-shaped sliding frames (213), second springs (214) and first guide wheels (215), two of the L-shaped plates (211) are symmetrically distributed on the left and right sides inside the shell (1), the L-shaped plates (211) are rotationally connected in the shell (1) through pivots, a second torsion spring is sleeved on the pivot of the L-shaped plate (211), one end of the second torsion spring is fixedly connected to the L-shaped plate (211), the other end of the second torsion spring is fixedly connected to the shell (1), a plurality of the guide rods (212) are fixedly installed on the rear side inside the shell (1), the C-shaped sliding frame (213) is slidingly connected to the guide rod (212), the end of the C-shaped sliding frame (213) close to the two L-shaped plates (211) is rotationally connected with the second guide wheel (217) through a pivot, the second guide wheel (217) is tightly attached to the side wall of the L-shaped plate (211) away from the center of the hollow cylindrical protection frame (27), a limiting frame (216) is fixedly installed on the rear side of the C-shaped sliding frame (213), the end of the limiting plate (26) away from the small-sized electric telescopic rod (25) is tightly attached to the limiting frame (216), the second spring (214) is sleeved on the guide rod (212), one end of the second spring (214) is tightly attached to the shell (1), the other end of the second spring (214) is tightly attached to the C-shaped sliding frame (213), the first guide wheel (215) is rotationally connected to the rear lower side of the rotating strip (21) through a pivot, and the first guide wheel (215) is located in the limiting frame (216).

9. The fingerprint recognition based electric vehicle charging gun according to claim 8, characterized in that, The front end of the L-shaped plate (211) is located in the rectangular opening (210).

10. The fingerprint recognition based electric vehicle charging gun according to claim 9, characterized in that, The gun body heat dissipation mechanism (3) comprises a gun head (31), a heat dissipation pipeline (32), a cold row (33), a water pump (34), a water tank (35) and a fan (36), the gun head (31) is fixedly installed on the front side of the shell (1), the heat dissipation pipeline (32) is S-shapedly distributed on the rear side of the gun head (31), the heat dissipation pipeline (32) is fixedly installed on the rear side of the gun head (31), the cold row (33) is located in the charging cabinet, the water pump (34) is fixedly installed on one side of the cold row (33), the water tank (35) is fixedly installed on one side of the cold row (33), two water outlets (37) are fixedly installed on the water tank (35), one of the water outlets (37) is connected to the input end of the water pump (34) through a pipeline, the other water outlet (37) is connected to the output end of the cold row (33) through a pipeline, a plurality of the fans (36) are fixedly installed on the cold row (33), one end of the heat dissipation pipeline (32) is connected to the output end of the water pump (34) through a pipeline, and the other end of the heat dissipation pipeline (32) is connected to the input end of the cold row (33) through a pipeline.

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