Large-current square terminal with replaceable reeds

Abstract

The invention relates to the technical field of new energy automobile charging, in particular to a large-current square terminal with a replaceable reed, which comprises a charging gun body, a charging gun head seat, a charging gun head panel, a clamping seat, a charging terminal, a reed, a positioning screw and an elastic module, a charging groove is formed in the left side of the charging gun head seat, and the clamping seat is mounted in the charging gun body; the charging terminal is inserted into the charging gun head seat, the reed is installed inside the charging terminal, the positioning screw penetrates through the right end of the charging terminal, the elastic module comprises a clamping plate, connecting rods, a lever and a supporting plate, the clamping plate and the supporting plate are inserted into the charging groove and the clamping seat in the radial direction, the two connecting rods are hinged to the clamping plate and the supporting plate respectively, and the two ends of the lever are hinged to the two connecting rods respectively. According to the invention, the detachable connection of the reed is associated with the detachable connection of the charging terminal, so that the reed is simply replaced, the connection stability of the reed and the terminal is improved, and the charging terminal is suitable for a large-current working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of new energy vehicle charging, in particular to a large-current square terminal with replaceable springs. Background Art

[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 (because its shape is usually square, it is often called a square terminal. To avoid confusion, it will be collectively referred to as a charging gun below). During the charging process of new energy vehicles, the charging terminals inside the charging gun are subjected to huge current loads and frequent plugging and unplugging operations, which 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 solve the above problems, the industry's initial approach was to use modular design to design a replaceable "gun head assembly" for the charging gun. This design separates the gun head shell from the rear cable. When the gun head shell is damaged due to falling or collision, only the gun head part needs to be replaced, thereby 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 shell is much lower than the wear frequency of the internal metal terminals. Therefore, further 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 panels, as disclosed in publication number CN116565614A, the structural design allows the charging terminals to be independently removed and replaced from inside the gun head. When the terminals are worn out or their performance degrades due to electrical wear, users do not need to replace the entire gun head, but only need to replace the failed terminals. This makes the maintenance of the charging gun more refined, thereby further saving the replacement cost of the charging gun.

[0005] While "replaceable terminals" are currently a relatively advanced technical solution, there's still room for improvement in cost control and resource utilization. During the charging process, the core component that makes direct electrical contact with the vehicle terminal and bears the greatest mechanical stress is the resilient contact structure within the charging terminal, such as the crown spring or reed blade. In contrast, the bulk of the charging terminal structure—the "terminal body" that serves as the base and conductor—experiences far less wear and tear than the reed blade, which makes direct contact. Therefore, in existing technology, replacing the entire charging terminal effectively discards the remaining intact terminal body, which accounts for the majority of the material cost, resulting in unnecessary waste.

[0006] Therefore, a large current square terminal with replaceable spring is proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a high-current square terminal with replaceable springs, which solves the problem that replacing the charging terminal affects the overall cost control and resource utilization of the equipment. By detachably connecting the spring inside the charging terminal and associating the detachable connection of the spring with the detachable connection of the charging terminal, the spring is easily replaced and the connection stability between the spring and the terminal is improved, making it suitable for high-current working conditions.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A high-current square terminal with replaceable spring, comprising a charging gun body, a charging gun head seat and a charging gun head panel, wherein 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, and further comprises a card seat, a charging terminal, a spring, a positioning screw and a tightening module, a charging slot is provided on the left side of the charging gun head seat, the card seat is installed inside the charging gun body, the charging terminal is inserted into the charging gun head seat, and the right end of the charging terminal is pressed against the card seat, the spring is installed inside the charging terminal, the positioning screw passes through the right end of the charging terminal, and the positioning screw extends into the inside of the card seat, the tightening module comprises a card plate, a connecting rod, a lever and a support plate, the card plate is inserted into the charging slot along the radial direction of the charging slot, the support plate is inserted into the card seat along the radial direction of the card seat, the two connecting rods are hinged to the card plate and the support plate respectively, and the two ends of the lever are hinged to the two connecting rods respectively;

[0010] The positioning screw passes through the reed and the charging terminal in sequence and is screwed into the card seat to lock the charging terminal and one end of the reed, and the positioning screw screwed into the card seat pushes the support plate outward from the card seat, and the lever is acted upon by the support plate to push the card plate to clamp the other end of the terminal and the reed.

[0011] Preferably, the tension module further comprises a spring, one end of the spring is connected to the right end of the lever, and the other end of the spring is connected to the outer surface of the base, and the free length of the spring is less than the minimum parallel distance between the lever and the base;

[0012] In the above solution, after the positioning screw is removed, the elastic force of the spring will strengthen the tendency of the support plate to contract radially inward along the card seat, thereby prompting the card plate to open radially outward along the charging slot.

[0013] Preferably, a support is provided inside the charging gun head seat, the lever is hinged on the support, the connection point between the lever and the support is recorded as the fulcrum, the connection points between the left and right connecting rods and the levers are recorded as the left point and the right point respectively, the connection point between the spring and the lever is recorded as the limit point, the distances between the fulcrum and the left point, the limit point, and the right point are recorded as L1, L2, and L3 respectively, then L3>L2>L1;

[0014] In the above scheme, when force is applied from the left point, the limit point, and the right point, the force arm increases step by step, so the labor-saving effect increases step by step. As a result, on the one hand, the spring can more stably maintain the state of the card being pulled up, so that the process of removing the reed and the charging terminal is smoother, thereby improving the efficiency of replacement; on the other hand, the process of tightening and loosening the positioning screw is more labor-saving, and even without using power tools, manual disassembly and assembly can be performed, thereby improving the convenience of reed replacement.

[0015] Preferably, the positioning screw comprises a nut, a nail body and a nail tip from left to right, and the nail tip is configured as a conical structure, and the cone angle of the nail tip is less than 90°;

[0016] In the above scheme, the nail tip is set to a conical structure so that it can gradually push the support plate during the right movement, so that the support plate opens radially outward along the card seat, so that the card plate shrinks radially inward along the charging slot under the action of the lever, thereby fixing the charging terminal and the spring inside the charging terminal; further, the cone angle of the nail tip is made less than 90°, which is considered from the perspective of force decomposition. The smaller inclination of the nail tip makes the right movement of the nail tip (i.e., tightening the positioning screw) more labor-saving, thereby making the spring replacement process simpler and more efficient.

[0017] Preferably, a side pressure chamfer is provided on the right side of the nut, the spring comprises 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 pressure chamfer are complementary to each other;

[0018] In the above scheme, the angles of the sheet chamfer and the side pressure chamfer are complementary to each other, so as to achieve close contact between the sheet chamfer and the side pressure chamfer. Through the action of the wedge-shaped inclined surfaces of the two chamfers, the axial pressing force applied by the nut to the sheet ring is partially decomposed into a radial pressing force on the sheet body, thereby achieving dual axial and radial fixation of the spring sheet. When the charging terminal is docked with the vehicle body terminal, the state of the end of the spring sheet can still remain stable when the middle part of the spring sheet is under pressure, so as to ensure the transmission of large current. The setting of the sheet chamfer also increases the overall strength of the spring sheet, thereby increasing its own durability and reducing the replacement frequency of the spring sheet.

[0019] Preferably, a card slot is provided on the left end surface of the charging terminal, the sheet platform is located at the left end of the sheet body, and the sheet platform is engaged with the card slot, and the thickness of the sheet platform is equal to the depth of the card slot;

[0020] In the above scheme, the circumferential positioning of the spring inside the charging terminal is achieved by the clamping connection between the card slot and the plate, and then when the card plate shrinks radially along the charging slot, the circumferential and axial fixation of the spring is achieved, making the installation of the spring more stable and suitable for high current working conditions.

[0021] 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, when the card plate shrinks along the radial direction of the charging slot, the card plate will interfere with the left end face of the charging terminal.

[0022] Preferably, the lower right edge of the card plate is chamfered, the right side of the card plate is in contact with the charging terminal and the tablet table, the lower left edge of the support plate is chamfered, and the angle of the support plate chamfer is equal to half of the cone angle of the nail tip;

[0023] In the above scheme, the interference between the card plate and the charging terminal is avoided by chamfering the card plate; the chamfering of the support plate has the following effects: 1) It avoids the contact between the tip of the nail tip and the surface of the support plate, thereby ensuring the overall strength of the support plate, so that the working process in which it participates is more stable; 2) Under the action of the right movement of the nail tip, after the support plate is fully opened along the radial direction of the card seat, it uses its own chamfer to contact with 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 be in line contact, which is more stable than point contact), to provide axial force for the positioning screw to achieve pre-tightening of the positioning screw, so that the positioning screw can fix the spring and the charging terminal more firmly.

[0024] Preferably, the number of the elastic modules is multiple, and the multiple elastic modules are arranged at equal angles;

[0025] In the above solution, multiple clamping plates arranged at equal angles are used to apply uniform force to the reed and the charging terminal to ensure the stability of the reed and the charging terminal, thereby being suitable for high current working conditions.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention realizes the two reverse functions of "disassembly" and "locking" driven by a single component, which greatly simplifies maintenance operations. The present invention uses the "positioning screw" as the core driving component, and can control the linkage of the entire tensioning module through a simple screwing in or out action. When screwing in, the screw drives the lever system to generate a huge clamping force, firmly locking the charging terminal and the reed; when screwing out, the clamping force is completely released, and the spring actively resets, allowing the reed to be removed without resistance. This highly integrated "single action, dual function" design simplifies the complex component replacement process into a one-step operation without the need for special tools, significantly reducing the difficulty, time cost and skill requirements of the operator for maintenance.

[0028] 2. This invention constructs a composite locking system that combines "lever amplification" with "spring preload," ensuring ultimate connection stability. The lever arm design (L3>L2>L1) provides significant mechanical advantage, allowing the operator to amplify the tiny torque applied to the set screw into a large and uniform clamping force on the clamping plate. Simultaneously, the presence of the spring, along with the chamfered corners of the support plate and the nail tip, provides preload force for the set screw after tightening. 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 at the moment of release, accelerating spring replacement efficiency.

[0029] 3. The present invention realizes multiple locking of the spring through synergistic action, making the spring more stable during operation, thereby improving the adaptability of the charging gun to high current working conditions; first, the radial clamping of the spring is achieved by inserting the spring inside the charging terminal; second, the precise circumferential positioning is achieved by the cooperation between the plate on the spring and the slot on the charging terminal, and further, the side pressure chamfer and the plate chamfer are tightly fitted under the action of tightening the positioning screw, so as to partially decompose the axial pressing force of the positioning screw on the spring into the radial direction, thereby enhancing the stability of the spring fixation by using a composite positioning method. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall isometric structure of the present invention;

[0031] Figure 2 This is a schematic diagram of the internal isometric structure of the present invention;

[0032] Figure 3 For the present invention Figure 2 A magnified schematic diagram of part A;

[0033] Figure 4 This is a schematic diagram of the positioning screw pre-insertion state of the present invention;

[0034] Figure 5 It is a schematic diagram of the overall front view structure of the present invention;

[0035] Figure 6 For the present invention Figure 5 A magnified schematic diagram of part B;

[0036] Figure 7 This is a schematic diagram of the structure of the reed, charging terminal and positioning screw of the present invention;

[0037] Figure 8 For the present invention Figure 3 The enlarged schematic diagram of part C in the middle;

[0038] Figure 9 For the present invention Figure 3 The enlarged schematic diagram of part D in the middle;

[0039] Figure 10 It is a schematic diagram of the partial isometric structure of the present invention.

[0040] In the figure: 1. Charging gun body; 2. Charging gun head seat; 21. Charging slot; 22. Support; 3. Charging gun head panel; 4. Card seat; 5. Charging terminal; 51. Card slot; 6. Spring; 61. Sheet body; 62. Sheet ring; 63. Sheet chamfer; 64. Sheet platform; 7. Positioning screw; 71. Nut; 711. Side pressure chamfer; 72. Nail body; 73. Nail tip; 8. Tension module; 81. Card plate; 82. Connecting rod; 83. Lever; 831. Fulcrum; 832. Left point; 833. Right point; 834. Limit point; 84. Support plate; 85. Spring. DETAILED DESCRIPTION

[0041] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0042] See also Figures 1 to 10 The present invention provides a large current square terminal with replaceable springs, and the technical solution is as follows:

[0043] A high-current square terminal with replaceable springs, comprising a charging gun body 1, a charging gun head seat 2 and a charging gun head panel 3, the charging gun head seat 2 being connected to the left side of the charging gun body 1, the charging gun head panel 3 being connected to the left side of the charging gun head seat 2, and further comprising a card holder 4, a charging terminal 5, a spring 6, a positioning screw 7 and a tightening module 8, a charging slot 21 being provided on the left side of the charging gun head seat 2, the card holder 4 being mounted inside the charging gun body 1, the charging terminal 5 being inserted into the charging gun head seat 2, and the right end of the charging terminal 5 being pressed against the card holder 4, the spring 6 being mounted inside the charging terminal 5, the positioning screw 7 passing through the right end of the charging terminal 5, and the positioning screw 7 extending into the inside of the card holder 4, the tightening module 8 comprising a card plate 81, a connecting rod 82, a lever 83 and a support plate 84, the card plate 81 being inserted into the charging slot 21 along the radial direction of the charging slot 21, the support plate 84 being inserted into the card holder 4 along the radial direction of the card holder 4, with reference to FIG. Figure 6The outer walls of the card holder 4 and the charging slot 21 are both provided with sliding grooves in the vertical direction, which are used to accommodate and guide the support plate 84 and the card plate 81, respectively. The two connecting rods 82 are hinged to the card plate 81 and the support plate 84, respectively. The ends of the lever 83 are hinged to the two connecting rods 82, respectively. To adapt to high current conditions, the charging terminal 5 is machined from C18150 chromium-zirconium copper bar material and its surface is silver-plated with a thickness of not less than 5μm. The reed 6 is stamped from C17200 beryllium bronze strip and also silver-plated to ensure excellent conductivity and long-lasting elasticity.

[0044] 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 the charging terminal 5 and one end of 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 acted upon by the support plate 84 to push the card plate 81 to clamp the other end of the terminal and the spring 6.

[0045] As an embodiment of the present invention, refer to Figures 1 to 6 The tension module 8 further 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. 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 base 4; hooks are set at both ends of the spring 85, and hanging rings are set on the surfaces of the lever 83 and the base 4. The installation of the spring 85 is achieved by connecting the hooks and the hanging rings.

[0046] When the support plate 84 is not under stress, the spring 85 tightens the right end of the lever 83 to always pull up the card plate 81, thereby providing space for the charging terminal 5 to enter the charging slot 21; when the support plate 84 is under stress, the right side of the lever 83 is lifted, the spring 85 is further stretched, and its own restoring force is also increased. With the help of the restoring force of the spring 85, the locked positioning screw 7 is pre-tightened to make its positioning of the spring leaf 6 and the charging terminal 5 stable and lasting, thereby ensuring stable operation under high current conditions.

[0047] As an embodiment of the present invention, refer to Figure 5 、 Figure 6 and Figure 10 The charging gun head base 2 is provided with a support 22 inside, and the lever 83 is hinged on the support 22. The connection point between the lever 83 and the support 22 is recorded as the fulcrum 831. The connection points between the left and right connecting rods 82 and the lever 83 are recorded as the left point 832 and the right point 833 respectively. The connection point between the spring 85 and the lever 83 is recorded as the limit point 834. The distances between the fulcrum 831 and the left point 832, the limit point 834, and the right point 833 are recorded as L1, L2, and L3 respectively. Then L3>L2>L1;

[0048] During installation, first weld the wiring 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, and then insert the support plate 84 into the card holder 4, and then complete the connection of the spring 85 on the lever 83 and the card holder 4, and then pass the lever 83 through the charging gun head seat 2, and complete the fixation of the charging gun head seat 2 on the charging gun body 1, and 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, and 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.

[0049] As an embodiment of the present invention, refer to Figure 7 , the positioning screw 7 includes a nut 71, a nail body 72 and a nail tip 73 from left to right. The nail tip 73 is set to a conical structure, and the cone angle of the nail tip 73 is less than 90°; a side pressure chamfer 711 is provided on the right side of the nut 71, and the spring 6 includes a sheet body 61, a sheet ring 62, a sheet chamfer 63 and a sheet platform 64. The sheet body 61 is coaxial with the charging terminal 5, the sheet ring 62 is located at the right end of the sheet body 61, and the sheet body 61 is located between the charging terminal 5 and the nut 71, the sheet chamfer 63 is located at the connection between the sheet body 61 and the sheet ring 62, and the angles of the sheet chamfer 63 and the side pressure chamfer 711 are complementary to each other;

[0050] When installing a new reed 6, the operator uses the conical nail tip 73 to easily pass the positioning screw 7 through the reed 6 and the charging terminal 5 and insert it into the card seat 4. As the operator further tightens the positioning screw 7 with a wrench, the positioning screw 7 continues to move to the right, and then pushes the support plate 84 with its own nail tip 73, and makes the support plate 84 open radially outward along the card seat 4, so that the card plate 81 contracts radially inward along the charging slot 21 under the action of the lever 83. After the positioning screw 7 is completely tightened, the card plate 8 1 is fully retracted, and its right end face presses against the left end face of the charging terminal 5 and the plate platform 64 to fix the charging terminal 5 and the spring 6 inside the charging terminal 5. At this time, the side pressure chamfer 711 of the nut 71 is close to the plate chamfer 63 of the spring 6. The angles of the side pressure chamfer 711 and the plate chamfer 63 are both 45 degrees, so the two are in close surface contact, and then the axial locking force of the nut on the spring 6 and the charging terminal 5 is decomposed in the radial direction, thereby enhancing the stability of the nut in fixing the spring 6 and the charging terminal 5.

[0051] As an embodiment of the present invention, refer to Figure 7 A card slot 51 is provided on the left end surface of the charging terminal 5, and a sheet platform 64 is located at the left end of the sheet body 61, and the sheet platform 64 is engaged with the card slot 51, and the thickness of the sheet platform 64 is equal to the depth of the card slot 51;

[0052] During the replacement of the reed 6, first take out the charging terminal 5 with the reed 6 inside, then take out the reed 6 from the inside of the charging terminal 5, and then install a new reed 6 into the inside of the charging terminal 5. During installation, align the plate 64 with the card slot 51 and insert it, and then install the charging terminal 5 to the charging slot 21 again. This method sets the same number of card slots 51 as the card board 81. When installing the charging terminal 5, align the card slot 51 with the card board 81, so that when the card board 81 contracts, the right end face of the card board 81 can be used to clamp the sheet 61 inside the card slot 51 to stably fix the reed 6.

[0053] As an embodiment of the present invention, refer to Figure 8 and Figure 9 The lower right edge of the card plate 81 is chamfered, and the right side of the card plate 81 is in contact with the charging terminal 5 and the sheet 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.

[0054] As the positioning screw 7 is tightened continuously, the card plate 81 is continuously contracted. When the card plate 81 just starts to contract, the charging terminal 5 has not yet been subjected to the axial force. Therefore, the right end face of the charging terminal 5 cannot be completely close to the left end face of the card seat 4. Therefore, the left end face of the charging terminal 5 will interfere with the card plate 81. The chamfer of the lower right edge of the card plate 81 can achieve a natural transition during the contraction of the card plate 81. In addition, the lower left edge of the card plate 81 is also chamfered, so that the charging gun can use the chamfer for guidance when plugging in, thereby making the plugging process smoother. During the locking process of the positioning screw 7, due to the chamfering of the support plate 84, the nail tip 7 The tip of the nail tip 73 does not contact the surface of the support plate 84, thereby ensuring the overall strength of the support plate 84, so that the working process of the positioning screw 7 is more stable, and the peripheral surface of the nail tip 73 continuously pushes up the support plate 84, so that the right end of the lever 83 is away from the card seat 4, and then the left end of the lever 83 is close to the charging slot 21, so as to drive the card plate 81 to retract, thereby achieving the clamping of the spring 6 and the charging terminal 5, and after the positioning screw 7 is fully tightened, the chamfered inclined surface of the support plate 84 maintains linear contact with the peripheral surface of the nail tip 73, and then converts the restoring force of the spring 85 into the pre-tightening force of the positioning screw 7, thereby improving the stability of the screw locking.

[0055] As an embodiment of the present invention, refer to Figure 6 , there are multiple elastic and tight modules, and multiple elastic modules 8 are arranged at equal angles; in this method, two groups of elastic modules 8 are set, and two upper and lower symmetrical clamping plates 81 are used to apply uniform force 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 working conditions.

[0056] Working Principle: The core of the present invention's replaceable reed 6 charging gun lies in its ingenious tightening and loosening module 8, which enables rapid assembly and disassembly, and secure locking, of the reed 6 within the charging terminal 5. Driven by a set screw 7, this module utilizes a lever 83 to amplify the locking force, and a spring 85 to provide preload and reset functions. This not only greatly simplifies maintenance operations, but also ensures long-term stable operation of the charging gun under high-current conditions by locking the reed 6 multiple times.

[0057] 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 pushing force of the screw on the support plate 84 disappears. Under the action of the gravity of the lever 83 itself and the auxiliary action of the tension of the spring 85, the right end of the lever 83 is pulled back, driving the card 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 spring 6 inside are then in a relaxed state and can be easily pulled out of the charging gun head seat 2; when installing, first place the plate 64 of the spring 6 into the card slot 51 of the charging terminal 5, then insert the charging terminal 5 with the new spring 6 into the charging slot 21, and then tighten the positioning screw 7 inward. The conical nail tip 73 of the screw will gradually push the support plate 84, and the support plate 84 will amplify the force through the lever 83 system and transmit it to the card plate 81, causing the card plate 81 to shrink inward, firmly clamping the charging terminal 5, and completing the locking;

[0058] In order to make the screwing-in and screwing-out process of the positioning screw 7 more labor-saving, the present invention designs the lever 83's force arm (L3>L2>L1) and the conical nail tip 73 of the positioning screw 7 less than 90°; when force is applied from the left point 832, the limit point 834, and the right point 833, the force arm increases step by step, so the labor-saving effect increases step by step. As a result, on the one hand, the spring 85 can more stably maintain the state of the card 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, the process of tightening and loosening the positioning screw 7 is made more labor-saving; and the conical nail tip 73 utilizes the inclined plane principle to efficiently convert the self-tapping motion of the screw into a steady pushing force on the support plate 84, thereby further reducing the operating resistance during the tightening and loosening of the positioning screw 7, and manual disassembly and assembly can be easily completed even without using power tools.

[0059] In order to ensure that the spring 6 is absolutely stable inside the charging terminal 5, the present invention performs triple locking on the spring 6: 1) radial locking: the radial clamping of the spring 6 is achieved by plugging the spring 6 into the charging terminal 5; 2) circumferential locking: by providing a card slot 51 on the left end face of the charging terminal 5 and allowing the plate 64 of the spring 6 to be clamped therewith, the circumferential positioning of the spring 6 inside the charging terminal 5 is achieved; 3) axial locking, and the radial locking is strengthened by the axial force: by providing a side pressure chamfer 711 on the nut 71 of the positioning screw 7 and a plate chamfer 63 on the spring 6, when the positioning screw 7 is tightened, the axial pressing force of the nut 71 on the plate ring 62 will be efficiently converted into a radial and axial dual pressing force on the plate body 61 through the inclined surface of the side pressure chamfer 711 and the plate chamfer 63. The above triple locking ensures that the end state of the spring 6 can remain stable when subjected to the insertion force, thereby ensuring the stable transmission of large currents;

[0060] In order to optimize the working process of the tensioning module 8, make the replacement process of the spring 6 more efficient, and make the spring 6 more stable after installation, the present invention chamfers the edges and corners of the card plate 81 and the support plate 84; the chamfer of the card plate 81 avoids interference with the left end face of the charging terminal 5 when the card plate 81 moves radially along the charging slot 21, thereby making the card plate 81 clamp the spring 6 and the charging terminal 5 smoother, thereby improving the replacement efficiency; and the chamfer of the support plate 84 avoids damage to the surface of the support plate 84 by the nail tip 73 of the positioning screw 7, and forms a stable line contact between the support plate 84 and the inclined surface of the nail tip 73, providing a reliable axial pre-tightening force for the positioning screw 7, and further enhancing the stability of the locking of the positioning screw 7; at the same time, through multiple tensioning modules 8 arranged at equal angles, it is ensured that the clamping force on the charging terminal 5 and the spring 6 is evenly distributed under the coordinated action of multiple card plates 81 set at equal angles, making it more stable to operate under high current conditions.

[0061] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A high-current square terminal with replaceable springs, used for plugging in and supplying energy to new energy vehicles, comprising a charging gun body (1), a charging gun head seat (2) and a charging gun head panel (3), characterized in that: The device also includes a card holder (4), a charging terminal (5), a spring (6), a positioning screw (7) and a tightening 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). The right end of the charging terminal (5) is pressed 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). end, and the positioning screw (7) extends into the interior of the card seat (4); the tension 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) along the radial direction of the charging slot (21); the support plate (84) is inserted into the card seat (4) along the radial direction of the card seat (4); 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); The positioning screw (7) passes through the spring (6) and the charging terminal (5) in sequence and is screwed into the card seat (4) to lock the charging terminal (5) and one end of the spring (6). The positioning screw (7) screwed into the card seat (4) pushes the support plate (84) outward from the card seat (4). The lever (83) is acted upon by the support plate (84) to push the card plate (81) to clamp the other end of the charging terminal (5) and the spring (6).

2. The high-current square terminal with replaceable spring according to claim 1, characterized in that: The tension module (8) further comprises a spring (85), one end of the spring (85) being connected to the right end of the lever (83), and the other end of the spring (85) being connected to the outer surface of the card seat (4), and the free length of the spring (85) being less than the minimum parallel distance between the lever (83) and the card seat (4).

3. The high-current square terminal with replaceable spring according to claim 2, characterized in that: A support (22) is provided inside the charging gun head seat (2), and a lever (83) is hinged on the support (22). The connection point between the lever (83) and the support (22) is recorded as a fulcrum (831), the connection points between the left and right connecting rods (82) and the lever (83) are recorded as the left point (832) and the right point (833), respectively, and the connection point between the spring (85) and the lever (83) is recorded as a limit point (834). The distances between the fulcrum (831) and the left point (832), the limit point (834), and the right point (833) are recorded as L1, L2, and L3, respectively, and L3>L2>L1.

4. The high-current square terminal with replaceable spring according to claim 1, characterized in that: The positioning screw (7) comprises a nut (71), a nail body (72) and a nail tip (73) from left to right. The nail tip (73) is configured as a conical structure, and the conical angle of the nail tip (73) is less than 90°.

5. The high-current square terminal with replaceable spring according to claim 4, characterized in that: A side pressure chamfer (711) is provided on the right side of the nut (71). The spring (6) comprises a sheet body (61), a sheet ring (62), a sheet chamfer (63) and a sheet platform (64). The sheet body (61) is coaxial with the charging terminal (5). The sheet ring (62) is located at the right end of the sheet body (61), and the sheet body (61) is located between the charging terminal (5) and the nut (71). The sheet chamfer (63) is located at the connection between the sheet body (61) and the sheet ring (62), and the angles of the sheet chamfer (63) and the side pressure chamfer (711) are complementary to each other.

6. The high-current square terminal with replaceable spring according to claim 5, characterized in that: A card slot (51) is provided on the left end surface of the charging terminal (5), a sheet platform (64) is located at the left end of the sheet body (61), and the sheet platform (64) is engaged with the card slot (51), and the thickness of the sheet platform (64) is equal to the depth of the card slot (51).

7. The high-current square terminal with replaceable spring according to claim 6, characterized in that: The lower right edge of the card plate (81) is chamfered, the right side of the card plate (81) is in contact with the charging terminal (5) and the sheet platform (64), the lower left edge of the support plate (84) is chamfered, and the angle of the chamfer of the support plate (84) is equal to half of the cone angle of the nail tip (73).

8. The high-current square terminal with replaceable spring according to claim 1, characterized in that: There are multiple elastic modules (8), and the multiple elastic modules (8) are arranged at equal angles.

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