A replaceable spring contact charging gun

Abstract

This invention relates to the field of new energy vehicle charging technology, specifically to a high-current square terminal with replaceable spring contacts. The terminal includes a charging gun body, a charging gun head base, a charging gun head panel, a mounting bracket, a charging terminal, a spring contact, a positioning screw, and a tensioning module. A charging slot is located on the left side of the charging gun head base. The mounting bracket is installed inside the charging gun body. The charging terminal is inserted into the charging gun head base. The spring contact is installed inside the charging terminal. The positioning screw passes through the right end of the charging terminal. The tensioning module includes a locking plate, connecting rods, a lever, and a support plate. The locking plate and support plate are respectively inserted radially into the charging slot and the mounting bracket. Two connecting rods are hinged to the locking plate and the support plate, respectively. The two ends of the lever are hinged to the two connecting rods. This invention achieves easy replacement of the spring contact by linking the disassembly and connection of the spring contact with the disassembly and connection of the charging terminal, and improves the connection stability between the spring contact and the terminal, making it suitable for high-current operating conditions.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle charging technology, specifically to a charging gun with replaceable springs. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the charging technology closely related to it is also constantly improving. For example, the charging gun (which is usually square in shape and is often called a square terminal; to avoid confusion, it will be referred to as a charging gun below) bears a huge current load and frequent plugging and unplugging operations during the charging process of new energy vehicles. This will lead to temperature rise, mechanical wear, and even arc erosion, which will seriously affect the service life of the charging gun and thus increase the cost of using the charging gun.

[0003] To address these issues, the industry initially adopted a modular design, creating a replaceable "gun head assembly" for the charging gun. This design separated the gun head housing from the rear cable, so that when the gun head was damaged due to a drop or collision, only the gun head part needed to be replaced, thus reducing the replacement cost of the charging gun.

[0004] However, with the continuous development of new energy charging technology, technicians have further realized that the damage frequency of the gun head housing is much lower than the wear frequency of the internal metal terminals. Therefore, refining the replaceable units to the terminal level has become a new technological trend. For example, in a charging gun with replaceable power terminals and gun head panel disclosed in CN116565614A, the structural design allows the charging terminals to be independently disassembled and replaced from inside the gun head. When the terminals are worn or degraded due to electrical wear, users do not need to replace the entire gun head, but only the failed terminals. This makes the maintenance of the charging gun more refined, thereby further saving the replacement cost of the charging gun.

[0005] Although "replaceable terminals" are a relatively advanced technology, there is still room for improvement in cost control and resource utilization. During charging, the core component that directly contacts the vehicle terminals and bears the greatest mechanical stress is the elastic contact structure inside the charging terminal, such as a crown spring or a spring sheet. In contrast, most of the charging terminal structure, namely the "terminal body" which serves as the base and conductor, experiences far less wear and tear than the directly contacting spring sheet portion. Therefore, in existing technologies, replacing the entire charging terminal effectively discards the still intact terminal body, which accounts for the majority of material costs, resulting in unnecessary waste.

[0006] To address this, a charging gun with replaceable reeds is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a charging gun with replaceable springs, which solves the problem of the impact of replacing charging terminals on the overall cost control and resource utilization of the equipment. By detachably connecting the springs inside the charging terminals and associating the detachment and connection of the springs with the detachment and connection of the charging terminals, the replacement of the springs is made easy, and the connection stability between the springs and the terminals is improved, making it suitable for high current conditions.

[0008] To achieve the above objectives, the present invention provides the following technical solution: A replaceable spring charging gun includes a charging gun body, a charging gun head seat, and a charging gun head panel. The charging gun head seat is connected to the left side of the charging gun body, and the charging gun head panel is connected to the left side of the charging gun head seat. It also includes a retainer, a charging terminal, a spring, a positioning screw, and a tensioning module. A charging slot is provided on the left side of the charging gun head seat. The retainer is installed inside the charging gun body. The charging terminal is inserted into the charging gun head seat, with its right end abutting against the retainer. The spring is installed inside the charging terminal. The positioning screw passes through the right end of the charging terminal and extends into the retainer. The tensioning module includes a retaining plate, connecting rods, a lever, and a support plate. The retaining plate is inserted into the charging slot radially, and the support plate is inserted into the retainer radially. Two connecting rods are hinged to the retaining plate and the support plate, respectively. The two ends of the lever are hinged to the two connecting rods, respectively. The positioning screw passes through the spring and the charging terminal in sequence and is screwed into the card holder to lock one end of the charging terminal and the spring. The positioning screw screwed into the card holder pushes the support plate outward of the card holder. The lever is pushed by the support plate to lock the other end of the terminal and the spring.

[0009] Preferably, the tensioning module further includes a spring, one end of which is connected to the right end of the lever, and the other end of which is connected to the outer surface of the card seat. The free length of the spring is less than the minimum parallel distance between the lever and the card seat. In the above scheme, after the positioning screw is removed, the spring force will strengthen the tendency of the support plate to retract radially inward along the card slot, thereby causing the card plate to open radially outward along the charging slot.

[0010] Preferably, the charging gun head seat has a support inside, the lever is hinged to the support, the connection point between the lever and the support is called the fulcrum, the connection points between the left and right connecting rods and the lever are called the left point and the right point, respectively, the connection point between the spring and the lever is called the limiting point, and the distances between the fulcrum and the left point, the limiting point and the right point are called L1, L2 and L3, respectively, then L3 > L2 > L1; In the above scheme, when force is applied from the left point, the limit point, and the right point, the lever arm increases step by step, so the labor-saving effect increases step by step. Thus, on the one hand, the spring can more stably maintain the state of the plate being pulled up, so that the process of removing the spring and the charging terminal is smoother, thereby improving the replacement efficiency; on the other hand, the process of tightening and loosening the positioning screw is less labor-intensive, and can be disassembled and assembled manually even without the use of power tools, thereby improving the convenience of spring replacement.

[0011] Preferably, the positioning screw includes a nut, a body, and a tip from left to right, and the tip is configured as a conical structure with a cone angle of less than 90°. In the above scheme, the nail tip is set as a conical structure so that it gradually pushes the support plate during the rightward movement, causing the support plate to open outward along the radial direction of the card seat. This allows the card plate to retract inward along the radial direction of the charging slot under the action of leverage, thereby fixing the charging terminal and the spring inside the charging terminal. Furthermore, making the conical angle of the nail tip less than 90° is from the perspective of force decomposition. By using the smaller slope of the nail tip, the rightward movement of the nail tip (i.e., tightening the positioning screw) is more labor-saving, thus making the replacement process of the spring more simple and efficient.

[0012] Preferably, the right side of the nut is provided with a side chamfer, the spring includes a sheet body, a sheet ring, a sheet chamfer and a sheet platform, the sheet body is coaxial with the charging terminal, the sheet ring is located at the right end of the sheet body and the sheet body is located between the charging terminal and the nut, the sheet chamfer is located at the connection between the sheet body and the sheet ring, and the angles of the sheet chamfer and the side chamfer are complementary. In the above solution, by utilizing the complementary angles of the chamfer and the side chamfer, the chamfer and the side chamfer are tightly fitted. Through the wedge-shaped inclined surface of the two chamfers, the axial clamping force applied by the nut to the spring ring is partially decomposed into a radial clamping force on the spring body. This achieves dual fixation of the spring in both the axial and radial directions. As a result, when the charging terminal is connected to the vehicle body terminal, the state of the spring end remains stable under the pressure of the inwardly retracted middle part of the spring, ensuring the transmission of high current. Furthermore, the chamfer setting also increases the overall strength of the spring, thereby increasing its durability and reducing the frequency of spring replacement.

[0013] Preferably, a slot is provided on the left end face of the charging terminal, the plate platform is located at the left end of the plate body, and the plate platform is engaged with the slot, the thickness of the plate platform is equal to the depth of the slot; In the above solution, the spring is circumferentially positioned inside the charging terminal by the snap-fit ​​between the slot and the plate stage. Then, when the plate retracts radially along the charging slot, the spring is fixed circumferentially and axially, making the installation of the spring more stable and thus suitable for high current conditions.

[0014] When the charging terminal is not locked by the positioning screw, there is a gap between it and the left end face of the card holder, and it is not completely fitted. As a result, during the process of the card plate shrinking radially along the charging slot, the card plate will interfere with the left end face of the charging terminal. Preferably, the lower right edge of the card plate is chamfered, the right side of the card plate is attached to the charging terminal and the plate platform, the lower left edge of the support plate is chamfered, and the chamfer angle of the support plate is equal to half of the cone angle of the nail tip; In the above scheme, the chamfer of the card plate avoids interference between the card plate and the charging terminal; the chamfer of the support plate has the following effects: 1) It avoids the contact between the tip of the nail and the surface of the support plate, thereby ensuring the overall strength of the support plate and making its participation in the working process more stable; 2) Under the rightward action of the nail tip, after the support plate is fully opened radially along the card seat, it provides axial force to the positioning screw by means of its own chamfer and the inclined surface of the nail tip (making the angle of the chamfer of the support plate equal to half of the cone angle of the nail tip, so that the support plate and the surface of the nail tip can make line contact, which is more stable than point contact), so as to achieve the pre-tightening of the positioning screw, thereby making the positioning screw more secure in fixing the spring and the charging terminal.

[0015] Preferably, there are multiple tightening and loosening modules, and the multiple tightening and loosening modules are arranged at equal angles; In the above scheme, multiple clamping plates set at equal angles apply force evenly to the spring and charging terminal to ensure the stability of the spring and charging terminal, thus making it suitable for high current conditions.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention achieves two reverse functions—"disassembly" and "locking"—driven by a single component, greatly simplifying maintenance operations. Using a "positioning screw" as the core driving component, the entire tensioning module can be controlled through a simple screwing-in or screwing-out action. When screwed in, the screw drives the lever system to generate a large clamping force, firmly locking the charging terminal and the spring; when screwed out, this clamping force is completely released, the spring actively resets, and the spring can be removed without resistance. This highly integrated "single-action, dual-function" design simplifies the complex component replacement process into a one-step operation, requiring no special tools, significantly reducing maintenance difficulty, time costs, and skill requirements for operators.

[0017] 2. This invention constructs a composite locking system combining "lever amplification" and "spring preload," ensuring ultimate connection stability. The lever arm design (L3>L2>L1) provides significant mechanical gain, amplifying the small torque applied by the operator to the positioning screw into a large and uniform clamping force acting on the clamping plate. Simultaneously, the presence of the spring, along with the chamfer of the support plate and the cooperation of the screw tip, provides preload to the positioning screw after locking. This not only maintains a stable connection between the spring and the charging terminal in the locked state but also provides a reliable reset force upon release, accelerating spring replacement efficiency.

[0018] 3. This invention achieves multiple locking of the spring sheet through synergistic action, making the spring sheet more stable during operation and thus improving the charging gun's adaptability to high current conditions. First, the spring sheet is radially clamped by inserting into the charging terminal. Second, precise circumferential positioning is achieved by the engagement of the spring sheet's plate and the slot on the charging terminal. Furthermore, the side chamfer and the plate chamfer are tightly fitted under the tightening action of the positioning screw, so as to partially decompose the axial clamping force of the positioning screw on the spring sheet into the radial direction, thereby enhancing the stability of the spring sheet fixation through a composite positioning method. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall isometric structure of the present invention; Figure 2 This is a schematic diagram of the internal axial side profile of the present invention; Figure 3 For the present invention Figure 2 Enlarged diagram of part A in the middle; Figure 4 This is a schematic diagram of the pre-insertion state of the positioning screw of the present invention; Figure 5 This is a schematic diagram of the overall front view of the present invention; Figure 6 For the present invention Figure 5 Enlarged diagram of section B; Figure 7 This is a schematic diagram of the spring, charging terminal, and positioning screw structure of the present invention; Figure 8 For the present invention Figure 3 Enlarged diagram of section C; Figure 9 For the present invention Figure 3 Enlarged diagram of section D in the middle; Figure 10 This is a schematic diagram of a partial equiaxed side structure of the present invention.

[0020] In the diagram: 1. Charging gun body; 2. Charging gun head base; 21. Charging slot; 22. Support; 3. Charging gun head panel; 4. Card holder; 5. Charging terminal; 51. Card slot; 6. Spring; 61. Plate body; 62. Plate ring; 63. Plate chamfer; 64. Plate platform; 7. Positioning screw; 71. Nut; 711. Side pressure chamfer; 72. Screw body; 73. Screw tip; 8. Tensioning module; 81. Card plate; 82. Connecting rod; 83. Lever; 831. Fulcrum; 832. Left point; 833. Right point; 834. Limiting point; 84. Support plate; 85. Spring. Detailed Implementation

[0021] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figures 1 to 10 This invention provides a charging gun with replaceable springs, the technical solution of which is as follows: A charging gun with replaceable springs includes a charging gun body 1, a charging gun head seat 2, and a charging gun head panel 3. The charging gun head seat 2 is connected to the left side of the charging gun body 1, and the charging gun head panel 3 is connected to the left side of the charging gun head seat 2. It also includes a retainer 4, a charging terminal 5, a spring 6, a positioning screw 7, and a tensioning module 8. A charging slot 21 is provided on the left side of the charging gun head seat 2. The retainer 4 is installed inside the charging gun body 1. The charging terminal 5 is inserted into the charging gun head seat 2, with its right end abutting against the retainer 4. The spring 6 is installed inside the charging terminal 5. The positioning screw 7 passes through the right end of the charging terminal 5 and extends into the retainer 4. The tensioning module 8 includes a retaining plate 81, a connecting rod 82, a lever 83, and a support plate 84. The retaining plate 81 is inserted radially into the charging slot 21, and the support plate 84 is inserted radially into the retainer 4. (Refer to...) Figure 6 The outer walls of the card holder 4 and the charging slot 21 are provided with sliding grooves along the vertical direction to accommodate and guide the support plate 84 and the card plate 81, respectively. The two connecting rods 82 are respectively hinged to the card plate 81 and the support plate 84, and the two ends of the lever 83 are respectively hinged to the two connecting rods 82. In order to adapt to the high current working conditions, the charging terminal 5 is machined from C18150 chromium zirconium copper rod and its surface is silver-plated with a thickness of not less than 5μm. The spring 6 is stamped from C17200 beryllium bronze strip and is also silver-plated to ensure excellent conductivity and lasting elasticity. The positioning screw 7 passes through the spring 6 and the charging terminal 5 in sequence and is screwed into the card holder 4 to lock one end of the charging terminal 5 and the spring 6. The positioning screw 7 screwed into the card holder 4 pushes the support plate 84 outward from the card holder 4. The lever 83 is pushed by the support plate 84 to push the card plate 81 to lock the other end of the terminal and the spring 6.

[0023] As one embodiment of the present invention, refer to Figures 1 to 6 The tensioning module 8 also includes a spring 85, one end of which is connected to the right end of the lever 83, and the other end of which is connected to the outer surface of the card holder 4, as shown in the figure. Figure 6 At this time, the spring 85 is not connected to the lever 83 and is in a free state, and the lever 83 is in a horizontal state. Obviously, the free length of the spring 85 is less than the minimum distance between the lever 83 and the card seat 4. Hooks are provided at both ends of the spring 85, and hanging rings are provided on the surfaces of the lever 83 and the card seat 4. The spring 85 is installed by connecting the hooks and hanging rings.

[0024] When the support plate 84 is not under force, the spring 85 pulls the right end of the lever 83 to keep the clamping plate 81 always up, thus providing space for the charging terminal 5 to enter the charging slot 21; when the support plate 84 is under force, the right side of the lever 83 is lifted, the spring 85 is further stretched, and its own restoring force also increases. Thus, with the restoring force of the spring 85, the locking positioning screw 7 is pre-tightened to make its positioning of the spring 6 and the charging terminal 5 stable and durable, thereby ensuring stable operation under high current conditions.

[0025] As one embodiment of the present invention, refer to Figure 5 , Figure 6 and Figure 10 The charging gun head seat 2 has a support 22 inside. The lever 83 is hinged to the support 22. The connection point between the lever 83 and the support 22 is called the fulcrum 831. The connection points between the left and right connecting rods 82 and the lever 83 are called the left point 832 and the right point 833, respectively. The connection point between the spring 85 and the lever 83 is called the limiting point 834. The distances between the fulcrum 831 and the left point 832, the limiting point 834, and the right point 833 are called L1, L2, and L3, respectively. Then L3 > L2 > L1. During installation, first solder the wire harness to the right side of the card holder 4 and fix the card holder 4 inside the charging gun body 1. Then, hinge the connecting rod 82 with the support plate 84 on the right side to the lever 83. Then, insert the support plate 84 into the card holder 4. Next, complete the connection of the spring 85 on the lever 83 and the card holder 4. Then, pass the lever 83 through the charging gun head seat 2 and fix the charging gun head seat 2 on the charging gun body 1. Then, install the support 22 to complete the hinge of the lever 83 on the charging gun head seat 2, thereby forming the fulcrum 831 of the lever 83. Finally, hinge the connecting rod 82 with the card plate 81 on the left side to the lever 83 and insert the card plate 81 into the charging slot 21.

[0026] As one embodiment of the present invention, refer to Figure 7 The positioning screw 7 includes a nut 71, a screw body 72, and a screw tip 73 from left to right. The screw tip 73 is a conical structure with a cone angle of less than 90°. A side chamfer 711 is provided on the right side of the nut 71. The spring 6 includes a plate body 61, a plate ring 62, a plate chamfer 63, and a plate platform 64. The plate body 61 is coaxial with the charging terminal 5. The plate ring 62 is located at the right end of the plate body 61, and the plate body 61 is located between the charging terminal 5 and the nut 71. The plate chamfer 63 is located at the connection between the plate body 61 and the plate ring 62, and the angles of the plate chamfer 63 and the side chamfer 711 are complementary. When installing the new spring 6, the operator uses the conical tip 73 to easily pass the positioning screw 7 through the spring 6 and the charging terminal 5, and insert it into the retainer 4. As the operator further tightens the positioning screw 7 with a wrench, the positioning screw 7 moves to the right, thereby pushing the support plate 84 through its own tip 73, and causing the support plate 84 to open radially outward along the retainer 4. This causes the retainer 81 to retract radially inward along the charging groove 21 under the action of the lever 83. After the positioning screw 7 is fully locked, the retainer 81... 1. When fully retracted, its right end face presses against the left end face of the charging terminal 5 and the plate 64 to fix the charging terminal 5 and the spring 6 inside the charging terminal 5. At this time, the side chamfer 711 of the nut 71 is close to the plate chamfer 63 of the spring 6. The angles of the side chamfer 711 and the plate chamfer 63 are both 45°, so the two make close surface contact. This decomposes the axial locking force of the nut 71 on the spring 6 and the charging terminal 5 radially, thereby enhancing the stability of the nut 71 on the spring 6 and the charging terminal 5.

[0027] As one embodiment of the present invention, refer to Figure 7 A slot 51 is provided on the left end face of the charging terminal 5. The plate stage 64 is located at the left end of the plate body 61 and is engaged with the slot 51. The thickness of the plate stage 64 is equal to the depth of the slot 51. During the replacement of the spring 6, first remove the charging terminal 5 containing the spring 6, then remove the spring 6 from the inside of the charging terminal 5, and then install the new spring 6 into the inside of the charging terminal 5. During installation, align the plate stage 64 with the slot 51 and insert it. Then, reinstall the charging terminal 5 into the charging slot 21. This method sets the number of slots 51 equal to the number of slots 81. When installing the charging terminal 5, align the slot 51 with the slot 81 so that when the slot 81 retracts, it clamps the plate 61 inside the slot 51 with its right end face to stably fix the spring 6.

[0028] As one embodiment of the present invention, refer to Figure 8 and Figure 9The lower right edge of the card plate 81 is chamfered, the right side of the card plate 81 is attached to the charging terminal 5 and the plate stage 64, the lower left edge of the support plate 84 is chamfered, and the chamfer angle of the support plate 84 is equal to half of the cone angle of the nail tip 73. As the positioning screw 7 is tightened, the retaining plate 81 retracts. At the beginning of the retraction, the charging terminal 5 is not yet subjected to axial force. Therefore, the right end face of the charging terminal 5 cannot completely adhere to the left end face of the retaining plate 4, resulting in interference between the left end face of the charging terminal 5 and the retaining plate 81. The chamfer on the lower right edge of the retaining plate 81 allows for a natural transition during retraction. Additionally, the lower left edge of the retaining plate 81 is also chamfered, allowing the charging gun to be guided during insertion, thus making the insertion process smoother. During the tightening process, the positioning screw 7, due to the chamfer on the support plate 84, has its tip 7... The tip of screw 3 does not contact the surface of the support plate 84, thus ensuring the overall strength of the support plate 84 and making the working process of the positioning screw 7 more stable. The circumferential surface of the screw tip 73 continuously pushes the support plate 84 up, moving the right end of the lever 83 away from the card seat 4, and thus moving the left end of the lever 83 closer to the charging slot 21, thereby driving the card plate 81 to retract, thereby clamping the spring 6 and the charging terminal 5. After the positioning screw 7 is fully tightened, the chamfered surface of the support plate 84 maintains line contact with the circumferential surface of the screw tip 73, thereby converting the restoring force of the spring 85 into the preload force of the positioning screw 7, thereby improving the stability of the screw locking.

[0029] As one embodiment of the present invention, refer to Figure 6 The number of tensioning modules 8 is multiple, and the multiple tensioning modules 8 are arranged at equal angles. In this method, two sets of tensioning modules 8 are set, and two symmetrical clamping plates 81 are used to apply force evenly to the spring 6 and the charging terminal 5 to ensure the stability of the spring 6 and the charging terminal 5, so as to be suitable for high current conditions.

[0030] Working Principle: The charging gun with replaceable spring 6 provided by this invention is based on a sophisticated tensioning module 8, which enables quick disassembly and secure locking of the spring 6 inside the charging terminal 5. This module is driven by a positioning screw 7, utilizes a lever 83 to amplify the locking force, and provides pre-tensioning and reset functions through a spring 85. This not only greatly simplifies maintenance operations but also ensures long-term stable operation of the charging gun under high current conditions through multiple locking mechanisms on the spring 6. Specifically, the disassembly and installation process of the spring 6 is controlled by a single positioning screw 7: When replacing the spring 6, the positioning screw 7 is unscrewed outward. At this time, the force exerted by the screw on the support plate 84 disappears. Under the action of the lever 83's own weight and the assistance of the spring 85's tension, the right end of the lever 83 is pulled back, causing the clamping plate 81 to open radially outward along the charging slot 21, thereby releasing the axial positioning of the charging terminal 5. The charging terminal 5 and the internal spring 6 are then in a relaxed state and can be easily pulled out from the charging gun head seat 2. During installation, the spring 6's plate base 64 is first placed into the charging terminal 5's slot 51, and then the charging terminal 5 with the new spring 6 is inserted into the charging slot 21. Then, the positioning screw 7 is screwed inward. The conical tip 73 of the screw will gradually push the support plate 84. The support plate 84 amplifies the force through the lever 83 system and transmits it to the clamping plate 81, causing the clamping plate 81 to retract inward and firmly clamp the charging terminal 5, thus completing the locking. To make the screwing in and unscrewing of the positioning screw 7 less strenuous, this invention designs a lever arm (L3>L2>L1) of the lever 83 and a conical tip 73 of the positioning screw 7 with an angle of less than 90°. When force is applied from the left point 832, the limiting point 834, and the right point 833, the lever arm increases step by step, thus increasing the strenuous effect step by step. This makes the spring 85 more stable in maintaining the state of the clamping plate 81 being pulled up, so that the process of removing the spring 6 and the charging terminal 5 is smoother, thereby improving the replacement efficiency. On the other hand, it makes the locking and unlocking process of the positioning screw 7 less strenuous. The conical tip 73 utilizes the principle of inclined plane to efficiently convert the self-tapping motion of the screw into a stable pushing force on the support plate 84, thereby further reducing the operating resistance during the locking and unlocking process of the positioning screw 7. Even without the use of power tools, manual disassembly and assembly can be easily completed.

[0031] To ensure the absolute stability of the spring 6 inside the charging terminal 5, the present invention employs a triple locking mechanism for the spring 6: 1) Radial locking: The spring 6 is radially clamped by inserting it into the charging terminal 5; 2) Circumferential locking: A slot 51 is provided on the left end face of the charging terminal 5, and the plate base 64 of the spring 6 is engaged with it, thus achieving circumferential positioning of the spring 6 inside the charging terminal 5; 3) Axial locking, and radial locking is reinforced by axial force: A side chamfer 711 is provided on the nut 71 of the positioning screw 7, and a plate chamfer 63 is provided on the spring 6. When the positioning screw 7 is tightened, the axial clamping force of the nut 71 on the plate ring 62 is efficiently converted into a dual radial and axial clamping force on the plate body 61 through the inclined surfaces of the side chamfer 711 and the plate chamfer 63. The above triple locking ensures that the end state of the spring 6 remains stable when subjected to insertion force, thereby ensuring the stable transmission of large current. To optimize the operation of the tensioning module 8, make the replacement of the spring 6 more efficient, and ensure the stability of the installed spring 6, the edges of the clamping plate 81 and the support plate 84 are chamfered. The chamfering of the clamping plate 81 prevents interference between the clamping plate 81 and the left end face of the charging terminal 5 when the clamping plate 81 moves radially along the charging slot 21, thus making the clamping of the spring 6 and the charging terminal 5 by the clamping plate 81 smoother and improving the replacement efficiency. The chamfering of the support plate 84 prevents the nail tip 73 of the positioning screw 7 from damaging the surface of the support plate 84, and makes the support plate 84 and the inclined surface of the nail tip 73 form a stable line contact, providing a reliable axial preload for the positioning screw 7, further enhancing the stability of the locking of the positioning screw 7. At the same time, the multiple tensioning modules 8 arranged at equal angles ensure that the clamping force on the charging terminal 5 and the spring 6 is evenly distributed under the synergistic action of multiple clamping plates 81 at equal angles, making it more stable under high current conditions.

[0032] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A replaceable spring charging gun for connecting to and powering new energy vehicles, comprising a charging gun body (1), a charging gun head base (2), and a charging gun head panel (3), characterized in that: It also includes a card holder (4), a charging terminal (5), a spring (6), a positioning screw (7), and a tensioning module (8). A charging slot (21) is provided on the left side of the charging gun head seat (2). The card holder (4) is installed inside the charging gun body (1). The charging terminal (5) is inserted into the charging gun head seat (2), and the right end of the charging terminal (5) abuts against the card holder (4). The spring (6) is installed inside the charging terminal (5). The positioning screw (7) passes through the right end of the charging terminal (5). The end of the positioning screw (7) extends into the inside of the card seat (4). The tensioning module (8) includes a card plate (81), a connecting rod (82), a lever (83) and a support plate (84). The card plate (81) is inserted into the charging slot (21) radially, and the support plate (84) is inserted into the card seat (4) radially. The two connecting rods (82) are respectively hinged to the card plate (81) and the support plate (84). The two ends of the lever (83) are respectively hinged to the two connecting rods (82). The positioning screw (7) passes through the spring (6) and the charging terminal (5) in sequence and is screwed into the card holder (4) to lock one end of the charging terminal (5) and the spring (6). The positioning screw (7) screwed into the card holder (4) pushes the support plate (84) outward from the card holder (4). The lever (83) is pushed by the support plate (84) to push the card plate (81) to lock the other end of the charging terminal (5) and the spring (6). The tensioning module (8) also includes a spring (85), one end of which is connected to the right end of the lever (83), and the other end of which is connected to the outer surface of the card seat (4). The free length of the spring (85) is less than the minimum parallel distance between the lever (83) and the card seat (4). The charging gun head seat (2) has a support (22) inside. The lever (83) is hinged to the support (22). The connection point between the lever (83) and the support (22) is called the fulcrum (831). The connection points between the left and right connecting rods (82) and the lever (83) are called the left point (832) and the right point (833) respectively. The connection point between the spring (85) and the lever (83) is called the limiting point (834). The distances between the fulcrum (831) and the left point (832), the limiting point (834), and the right point (833) are called L1, L2, and L3 respectively. Then L3 > L2 > L1. The positioning screw (7) includes a nut (71), a body (72) and a tip (73) from left to right. The tip (73) is set as a conical structure and the cone angle of the tip (73) is less than 90°. A side chamfer (711) is provided on the right side of the nut (71). The spring (6) includes a plate body (61), a plate ring (62), a plate chamfer (63), and a plate platform (64). The plate body (61) is coaxial with the charging terminal (5). The plate ring (62) is located at the right end of the plate body (61), and the plate body (61) is located between the charging terminal (5) and the nut (71). The plate chamfer (63) is located at the connection between the plate body (61) and the plate ring (62), and the angles of the plate chamfer (63) and the side chamfer (711) are complementary.

2. The charging gun with replaceable springs according to claim 1, characterized in that: A slot (51) is provided on the left end face of the charging terminal (5). The plate stage (64) is located at the left end of the plate body (61), and the plate stage (64) is engaged with the slot (51). The thickness of the plate stage (64) is equal to the depth of the slot (51).

3. A charging gun with replaceable springs according to claim 2, characterized in that: The lower right edge of the card plate (81) is chamfered, the right side of the card plate (81) is attached to the charging terminal (5) and the plate platform (64), the lower left edge of the support plate (84) is chamfered, and the chamfer angle of the support plate (84) is equal to half of the cone angle of the nail tip (73).

4. A charging gun with replaceable springs according to claim 1, characterized in that: There are multiple tensioning modules (8), and the multiple tensioning modules (8) are arranged at equal angles.

Images