Electric connection device with high maintenance efficiency

Abstract

The invention discloses a high-efficiency maintenance electric connection device, which comprises an external assembly and a connector main body, the external assembly comprises a joint shell and an external terminal, the external terminal is arranged in the joint shell, the connector main body comprises a main shell and an internal terminal, the internal terminal is arranged in the main shell, a connection part is formed at one end of the main shell, and the internal terminal is arranged at the other end of the main shell. The connector shell is detachably installed and connected with the connecting part, the rear end of the external terminal is detachably and conductively connected with the front end of the internal terminal in an inserted mode, and a wiring end used for being conductively connected with the end of a cable is formed at the rear end of the internal terminal. The electric connection device is convenient to maintain, and the maintenance cost of the electric connection device can be reduced.

Description

Technical Field

[0001] The invention relates to the field of electrical connection devices, and in particular to an electrical connection device with high-efficiency maintenance. Background Art

[0002] At present, electrical connection devices are used to connect electrical equipment with power supply equipment; for example, the electrical connection device can be a charging gun. When charging a new energy vehicle, it is necessary to connect the vehicle charging socket with the charging gun of the charging pile. The frequency of use of the vehicle charging gun increases, but the charging gun pin assembly is a consumable part. Its working principle is to achieve conductive contact and then transfer electrical energy through the interference fit of the male and female contact terminals (pins and holes). The plugging and unplugging process generates obvious friction, which makes the contact terminals easy to wear and their lifespan is relatively low. After reaching the expected lifespan (mainly the power terminals), the terminal and the cable are connected by welding or riveting, so the manufacturer needs to remove the entire charging gun cable and return it to the factory for maintenance, resulting in a waste of manpower, material resources and costs. In addition, replacing the entire gun is complicated, inefficient and costly. However, if it is not replaced in time, it may cause safety accidents. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an electrical connection device with high maintenance efficiency, which is conducive to facilitating the maintenance of the electrical connection device and reducing the maintenance cost of the electrical connection device.

[0004] The purpose of the present invention is achieved through the following technical solutions.

[0005] The invention discloses an efficient and maintainable electrical connection device, comprising an external component and a connector body, wherein the external component comprises a connector shell and an external terminal, wherein the external terminal is arranged in the connector shell, and the connector body comprises a main shell and an internal terminal, wherein the internal terminal is arranged in the main shell, a connecting portion is formed at one end of the main shell, the connector shell is detachably mounted and connected to the connecting portion, the rear end portion of the external terminal is detachably conductively plugged with the front end portion of the internal terminal, and the rear end portion of the internal terminal is formed with a wiring terminal for conductively connecting the end of a cable.

[0006] Preferably, the rear end portion of the external terminal is formed with an elastic claw sleeve, the front end portion of the internal terminal is formed with a shell portion and an inner support core column, the inner support core column is arranged in the shell portion, the elastic claw sleeve is contact-typely sleeved outside the inner support core column, and the outer end of the elastic claw sleeve contacts and is connected to the inner wall of the shell portion.

[0007] Preferably, the inner wall of the sleeve shell is set as an inner conical surface, the inner conical surface is larger at the front and smaller at the rear, and a claw head is formed at the rear end of the elastic claw sleeve, and the claw head is clamped between the inner conical surface and the inner support core column.

[0008] Preferably, the rear end portion of the joint housing is adapted to be plugged into the connecting portion.

[0009] Preferably, a sealing ring is provided between the rear end of the joint housing and the inner wall of the connecting portion.

[0010] Preferably, the joint housing is connected to the main housing via fasteners.

[0011] Preferably, the connector body comprises a bracket, the bracket is arranged in the main housing, the bracket is formed with a bayonet, and the bayonet is bayoneted to the outer side of the corresponding internal terminal.

[0012] Preferably, an inner convex positioning piece is formed in the bayonet, a card slot is formed outside the internal terminal, and the inner convex positioning piece is adapted to be arranged in the card slot.

[0013] Preferably, an inner step and an inner convex buckle are formed in the main shell, the inner convex buckle is arranged on the front side of the inner step, and the edge of the bracket is arranged between the inner convex buckle and the inner step.

[0014] Preferably, an external socket is formed at the front end of the external terminal, a first slit distributed circumferentially is formed on the external socket, and a spring coil is sleeved at the front end of the external socket.

[0015] Compared with the prior art, the present invention has the following beneficial effects: by setting an external component and a connector body, the external component includes a connector shell and an external terminal, the external terminal is arranged in the connector shell, the connector body includes a main shell and an internal terminal, the internal terminal is arranged in the main shell, a connecting portion is formed at one end of the main shell, the connector shell and the connecting portion are detachably installed and connected, the rear end portion of the external terminal and the front end portion of the internal terminal are detachably conductively plugged, and the rear end portion of the internal terminal is formed with a wiring terminal for conductively connecting the end of a cable, so that the external component can be disassembled and replaced, which is conducive to convenient maintenance of the electrical connection device and can reduce the maintenance cost of the electrical connection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the three-dimensional structure of the electrical connection device of the present invention.

[0017] Figure 2 It is an exploded schematic diagram of the electrical connection device of the present invention.

[0018] Figure 3 It is a schematic cross-sectional view of the electrical connection device of the present invention.

[0019] Figure 4 It is a schematic cross-sectional structural diagram of the external component of the present invention.

[0020] Figure 5It is a rear perspective structural schematic diagram of the external terminal and the internal terminal assembled according to the present invention.

[0021] Figure 6 It is a cross-sectional structural schematic diagram of the assembly of the external terminal and the internal terminal of the present invention.

[0022] Figure 7 It is a schematic cross-sectional structural diagram of the external terminal of the present invention.

[0023] Figure 8 It is a schematic cross-sectional structural diagram of the internal connection terminal of the present invention.

[0024] Fig. 9 It is a rear perspective structural schematic diagram of the connector housing of the present invention.

[0025] Fig.10 It is a front view stereoscopic structural schematic diagram of the bracket of the present invention.

[0026] Fig.11 It is a front perspective structural schematic diagram of the main shell of the present invention.

[0027] Explanation of reference numerals: external component 1; connector housing 11; terminal accommodating cavity 111; mounting hole 1111; external terminal 12; external socket 121; first slit 1210; positioning ring groove 1211; elastic claw sleeve 122; claw head 1221; second slit 1220; spring coil 123; fixing screw 13; sealing ring 14; connector body 2; main housing 21; connecting portion 211; inner convex buckle 2101; mounting screw hole 2102; wire outlet 212; inner step 213; internal terminal 22; wiring terminal 221; housing portion 222; inner conical surface 2221; inner support core column 223; slot 224; bracket 23; bayonet 231; inner convex positioning piece 2311; elastic buckle block 2312; through slot 2310; cable 3; cable end 31. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] The highly efficient maintenance electrical connection device of the present invention, such as Figures 1 to 3 As shown, it includes an external component 1 and a connector body 2, such as Figure 2 and Figure 4 As shown, the external connection assembly 1 includes a connector housing 11 and an external connection terminal 12. The connector housing 11 is made of plastic, and the external connection terminal 12 is arranged in the connector housing 11. Figure 2 and Figure 3 As shown, the connector body 2 includes a main housing 21 and an internal terminal 22. The main housing 21 is made of insulating materials of the prior art, and the main housing 21 can be made of plastic. The internal terminal 22 is arranged in the main housing 21. Fig.11As shown, a connecting portion 211 is formed at one end of the main housing 21. Figure 1 and Figure 3 As shown, the joint housing 11 is detachably connected to the connecting portion 211. Figure 3 and Figure 5 As shown, the rear end of the external terminal 12 is detachably and conductively plugged into the front end of the internal terminal 22 , and the rear end of the internal terminal 22 is formed with a connection terminal 221 for conductively connecting the cable end 31 .

[0030] The external terminal 12 is used for external conductive connection. For example, the electrical connection device of the present invention can be a charging gun, so the external terminal 12 is used for conductive plugging into the conductive terminal of the charging socket; the internal terminal 22 is used for internal conductive connection, that is, the internal terminal 22 is used to make the external terminal 12 and the cable 3 conductively connected; in daily use, the front end of the external terminal 12 often rubs against the conductive terminal of the charging socket when plugging and unplugging, but the external terminal 12 and the internal terminal 22 are kept relatively fixed, so it is the external terminal 12 that will be worn. Therefore, when the external terminal 12 is worn or other problems that affect the work occur, the connector housing 11 and the connecting portion 211 can be connected. The installation connection is released, and the connector housing 11 is separated from the main housing 21, so that the external terminal 12 can be pulled out of the internal terminal 22. The connector housing 11 and the external terminal 12 can be relatively positioned along the axial direction of the external terminal 12. Then, when the connector housing 11 is separated from the main housing 21, the external terminal 12 can be pulled out of the internal terminal 22 at the same time; the connector housing 11 of the new external component 1 is moved toward the main housing 21 so that the external terminal 12 is plugged into the internal terminal 22, and then the connector housing 11 is installed and connected to the main housing 21, so that the replacement of the external component 1 can be completed. The above replacement operation is simple and quick, so that the electrical connection device has a high maintenance efficiency. The manufacturer's maintenance personnel only need to bring a new external component 1 to the site for replacement, and the replacement process is simple and quick, avoiding the need to replace the entire charging gun, which is conducive to reducing the material cost of maintenance; since the external component 1 is easy to disassemble and install, users can also replace the external component 1 by themselves, and the manufacturer only needs to mail the new external component 1 to the customer, thereby saving manpower, material resources and costs; of course, users can also only replace the external terminal 12. Since the external component 1 is easy to disassemble and install, it is conducive to maintaining the electrical connection device (charging gun) with better performance and avoiding safety accidents.

[0031] Furthermore, if Figure 7 As shown, the rear end of the external terminal 12 is formed with an elastic claw sleeve 122, and the elastic claw sleeve 122 includes a plurality of circumferentially distributed elastic claws. Specifically, the sleeve-like structure is divided by processing the second slit 1220 to form the above-mentioned elastic claws, so that each elastic claw can be elastically swung radially inward and outward by a small amplitude, so that the elastic claw sleeve 122 can be elastically opened or elastically contracted by a small amplitude, such as Figure 8 As shown, the front end of the internal terminal 22 is formed with a casing portion 222 and an inner support column 223, and the inner support column 223 is arranged in the casing portion 222, and the inner support column 223 and the casing portion 222 are arranged coaxially. Figure 6 As shown, the elastic claw sleeve 122 is contact-type sleeved outside the inner support column 223, and the outer end of the elastic claw sleeve 122 contacts the inner wall of the connecting sleeve shell 222. In other words, the radial inner end of the elastic claw sleeve 122 contacts the outer cylindrical surface of the connecting inner support column 223, and the radial outer end of the elastic claw sleeve 122 contacts the inner wall of the connecting sleeve shell 222, so that the internal terminal 22 and the external terminal 12 are simultaneously in contact with each other, which is conducive to enhancing the reliability of the electrical connection between the internal terminal 22 and the external terminal 12. When plugging, the external terminal 12 and the internal terminal 22 move closer to each other axially, and each elastic claw of the elastic claw sleeve 122 is inserted between the sleeve shell 222 and the inner support column 223, and an annular groove is formed between the inner wall of the sleeve shell 222 and the outer cylindrical surface of the inner support column 223, and the elastic claw and the annular groove are interference fit. If the elastic claw sleeve 122 is relaxed and opened due to fatigue, the inner wall of the shell portion 222 blocks the elastic claw sleeve 122 from relaxing and opening, so that the internal terminal 22 can reliably conduct electricity with the external terminal 12 .

[0032] Furthermore, if Figure 8 As shown, the inner wall of the casing portion 222 is set as an inner conical surface 2221, and the inner conical surface 2221 is set larger at the front and smaller at the back. In other words, the opening of the casing portion 222 is at the front, and the inner diameter of the front end of the inner conical surface 2221 is larger than the inner diameter of the rear end of the inner conical surface 2221, so that the opening of the casing portion 222 is in a bell-mouth shape. Figure 7 As shown, the rear end of the elastic claw sleeve 122 is formed with a claw head 1221. In other words, the claw head 1221 is a portion of the elastic claw sleeve 122 with a relatively large wall thickness. Figure 6As shown, the claw head 1221 is sandwiched between the inner conical surface 2221 and the inner supporting core column 223 . When the external terminal 12 is plugged into the internal terminal 22, the elastic claw sleeve 122 is inserted into the above-mentioned annular groove, and the radial inner end of the claw head 1221 first contacts the outer cylindrical surface of the inner support core column 223, and the elastic claw sleeve 122 can be elastically opened slightly, so the initial stage of the plug-in process is relatively easy. Since the inner conical surface 2221 is set to be larger at the front and smaller at the back, as the elastic claw sleeve 122 gradually penetrates into the shell portion 222, the inner wall of the shell portion 222 is relatively pressed radially toward the radial outer end of the claw head 1221, and the radial reaction force of the inner conical surface 2221 on the claw head 1221 gradually increases, so that the radial force applied by the radial inner end of the claw head 1221 to the inner support core column 223 also gradually increases, which is beneficial to increase the contact pressure between the claw head 1221 and the inner conical surface 2221 and the inner support core column 223, and is beneficial to make the conductive connection more reliable. Due to the provision of the claw head 1221 structure, the contact between the external terminal 12 and the internal terminal 22 is concentrated at the claw head 1221, which is beneficial to increase the contact pressure and make the conductive contact more reliable. Figure 7 As shown, the elastic claw sleeve 122 can be gradually contracted from front to back in a free state, and the claw head 1221 can be radially convex. Figure 7 and Figure 8 As shown, the outer diameter of the front end of the elastic claw sleeve 122 is "X1", the outer diameter of the claw head 1221 is "X2", the inner diameter of the claw head 1221 is "X3", the inner diameter of the front end of the inner conical surface 2221 is "D1", the inner diameter of the rear end of the inner conical surface 2221 is "D2", and the outer diameter of the inner support core column 223 is "D3". The size relationship is as follows: D1>X2>D2, so that when the elastic claw sleeve 122 is inserted into the sleeve shell 222, the claw head 1221 and the inner conical surface 2221 are gradually in contact; D3 >X3, so that during the process of the elastic claw sleeve 122 being inserted into the sleeve shell 222, the claw head 1221 can contact the outer cylindrical surface of the inner support core column 223, and the elastic claw sleeve 122 elastically opens slightly, thereby first ensuring that the claw head 1221 is in reliable contact with the outer cylindrical surface of the inner support core column 223, and then the inner conical surface 2221 is relatively pressed against the claw head 1221; D1>X1, avoiding the front end of the elastic claw sleeve 122 being blocked and interfered by the front end of the inner conical surface 2221, thereby affecting the effect of the inner conical surface 2221 pressing the claw head 1221 radially inward.

[0033] Furthermore, if Figure 3 and Fig.11As shown, the rear end of the connector housing 11 is adapted to fit the plug-in connecting portion 211. Specifically, a wire outlet 212 is formed at the other end corresponding to the main housing 21, and an interface is formed at the connecting portion 211. The interface is connected to the wire outlet 212. The rear end of the connector housing 11 is adapted to fit the interface, so that the interface plays a positioning role for the connector housing 11. During the installation of the connector housing 11, the rear end of the connector housing 11 is inserted backwards into the interface, and at the same time, the elastic claw sleeve 122 is inserted into the sleeve portion 222. When the connector housing 11 is plugged into place, the external terminal 12 and the internal terminal 22 are also plugged into place at the same time.

[0034] Furthermore, if Figure 3 As shown, a sealing ring 14 is provided between the rear end of the connector housing 11 and the inner wall of the connecting portion 211, that is, the sealing ring 14 is provided between the rear end exterior of the connector housing 11 and the above-mentioned interface, thereby preventing water from penetrating into the interior of the electrical connecting device through the gap between the connector housing 11 and the connecting portion 211.

[0035] Furthermore, the joint housing 11 and the main housing 21 are connected by fasteners, which is conducive to reliable relative fixation of the joint housing 11 and the main housing 21. More specifically, the fasteners can be fixing screws 13, such as Fig.11 As shown, a mounting column is formed in the main housing 21, and a mounting screw hole 2102 is formed at the front end of the mounting column. Fig. 9 As shown, the connector housing 11 is formed with a mounting hole 1111, and the fixing screw 13 passes through the mounting hole 1111 backward and is connected to the corresponding mounting screw hole 2102, so as to firmly and reliably fix the connector housing 11 to the main housing 21; when it is necessary to remove the external component 1, the fixing screw 13 is first removed, and then the connector housing 11 is pulled forward away from the main housing 21. In some embodiments, the connector housing 11 and the main housing 21 can also be buckled, bonded, or connected by pins.

[0036] Furthermore, if Figure 2 and Figure 3 As shown, the connector body 2 includes a bracket 23, and the bracket 23 is arranged in the main housing 21. Fig.10 As shown, the bracket 23 is formed with a bayonet 231. Figure 2 and Figure 3 As shown, the bayonet 231 is clamped on the outer side of the corresponding internal terminal 22, so that the bracket 23 plays a radial supporting role for the internal terminal 22. The shape of the bracket 23 is adapted to the internal structure of the main housing 21, so that the main housing 21 positions the bracket 23. The fixing screw 13 passes through the bracket 23.

[0037] Furthermore, if Fig.10 As shown, an inner convex positioning piece 2311 is formed in the bayonet 231. Figure 8As shown, a slot 224 is formed on the outside of the internal terminal 22. The slot 224 is an annular groove. Figure 3 As shown, the inner convex positioning piece 2311 is adapted to be disposed in the slot 224, so that the inner terminal 22 and the bracket 23 are relatively positioned in the axial direction of the inner terminal 22. Fig.10 As shown, the inner convex positioning piece 2311 forms an elastic buckle block 2312 at the entrance of the bayonet 231, and the inner convex positioning piece 2311 forms a through groove 2310, and the position of the through groove 2310 corresponds to the elastic buckle block 2312. When the inner convex positioning piece 2311 is relatively inserted into the slot 224, the bottom of the slot 224 squeezes the elastic buckle block 2312, so that the through groove 2310 corresponding to the elastic buckle block 2312 is elastically narrowed and deformed. After the bottom of the slot 224 passes over the elastic buckle block 2312, the through groove 2310 is elastically reset, so that the elastic buckle block 2312 can prevent the internal terminal 22 from radially disengaging from the corresponding bayonet 231.

[0038] Furthermore, if Fig.11 As shown, the main housing 21 is formed with an inner step 213 and an inner convex buckle 2101, and the inner convex buckle 2101 is arranged on the front side of the inner step 213. Figure 2 and Figure 3 As shown, the edge of the bracket 23 is arranged between the inner convex buckle 2101 and the inner step 213, so that the bracket 23 is positioned in the main housing 21 front and back through a simple buckle structure, and the bracket 23 can be inserted into the main housing 21 through the above interface, and when the rear of the bracket 23 contacts the inner step 213, the front of the bracket 23 just passes over the inner convex buckle 2101, so that the inner convex buckle 2101 is buckled to the front side of the edge of the bracket 23. In some embodiments, the bracket 23 can also be connected to the main housing 21 by screws.

[0039] Furthermore, if Figure 5 and Figure 7 As shown, the front end of the external terminal 12 is formed with an external socket 121, and the external socket 121 is formed with a circumferentially distributed first slit 1210, which is extended in a direction parallel to the axis of the external terminal 12, wherein the front end of the first slit 1210 passes through the external socket 121, and the rear end of the first slit 1210 is terminated at the rear end of the external socket 121, so that the external socket 121 can be elastically opened to a small extent; Figure 5 and Figure 6 As shown, the front end of the external plug sleeve 121 is provided with a spring coil 123. Figure 7 As shown, a positioning ring groove 1211 is formed at the front end of the external socket 121, and the spring coil 123 is arranged in the positioning ring groove 1211 to prevent the spring coil 123 from being separated from the external socket 121 along the axial direction of the external socket 121. The spring coil 123 is formed by spirally winding a spring steel wire, as shown in FIG. Fig. 9As shown, a terminal accommodating cavity 111 is formed in the connector housing 11. Figure 4 As shown, the external socket 121 is inserted into the corresponding terminal accommodating cavity 111 from back to front, and a plug hole is formed at the front end of the terminal accommodating cavity 111. For example, when the connector housing 11 is inserted into the charging socket, the plug pin of the charging socket can pass through the above-mentioned plug hole and then be inserted into the external socket 121 with interference fit, so that the external socket 121 is elastically deformed and opened slightly, so that the spring coil 123 is also elastically opened, and the elastic deformation force of the spring coil 123 assists in holding the plug pin tightly, and when the plug pin is relatively pulled away from the external socket 121, the elastic deformation force of the spring coil 123 can assist the external socket 121 to elastically shrink and reset, so that the external socket 121 can be prevented from being unable to form a close and conductive connection with the plug pin due to fatigue relaxation.

[0040] During the assembly process of the electrical connection device of the present invention, Figure 3 As shown, the cable 3 is first passed through the main shell 21 through the outlet 212, and then the cable end 31 is connected to the terminal 221 of the internal terminal 22. For example, the cable end 31 can be inserted into the terminal 221, and then the terminal 221 is riveted, or the cable end 31 and the terminal 221 are connected by ultrasonic welding, fusion welding or fasteners; then, the internal terminal 22 is snapped onto the bracket 23, and when the bracket 23 is inserted and installed into the main shell 21, during which time, the cable 3 retreats a certain length toward the outlet 212, and then the cable 3 and the outlet 212 of the main shell 21 are sealed and connected by a rubber-encapsulated integrated molding process, that is, an insulating colloid is molded between the outlet 212 and the outer wall of the cable 3; then the external terminal 12 is installed in the connector shell 11, and then the external component 1 is installed to the connecting portion 211 of the main shell 21.

[0041] When the electrical connection device of the present invention is a new energy vehicle charging gun, the combination of the external terminal 12 and the internal terminal 22 can have several specifications, but the rear end of the external terminal 12 and the front end of the internal terminal 22 are all detachably conductively plugged.

[0042] In summary, the electrical connection device of the present invention has the following advantages: (1) Maintenance operation is easy, simple and fast.

[0043] (2) The after-sales operation and maintenance costs of the product are low.

[0044] (3) The connection between the external terminal 12 and the internal terminal 22 is reliable and stable, which is conducive to the transmission of large current.

Claims

1. An electrical connection device with high maintenance efficiency, characterized in that: The invention comprises an external component (1) and a connector body (2), wherein the external component (1) comprises a connector shell (11) and an external terminal (12), wherein the external terminal (12) is arranged in the connector shell (11), and the connector body (2) comprises a main shell (21) and an internal terminal (22), wherein the internal terminal (22) is arranged in the main shell (21), and a connecting portion (211) is formed at one end of the main shell (21), wherein the connector shell (11) and the connecting portion (211) are detachably mounted and connected, wherein the rear end portion of the external terminal (12) and the front end portion of the internal terminal (22) are detachably conductively plugged, and the rear end portion of the internal terminal (22) is formed with a connection terminal (221) for conductively connecting to a cable end (31).

2. The highly efficient maintenance electrical connection device according to claim 1, characterized in that: The rear end of the external terminal (12) is formed with an elastic claw sleeve (122), the front end of the internal terminal (22) is formed with a shell portion (222) and an inner support core column (223), the inner support core column (223) is arranged in the shell portion (222), the elastic claw sleeve (122) is contact-sleeved outside the inner support core column (223), and the outer end of the elastic claw sleeve (122) contacts and connects to the inner wall of the shell portion (222).

3. The highly efficient maintenance electrical connection device according to claim 2, characterized in that: The inner wall of the sleeve shell (222) is configured as an inner conical surface (2221), the inner conical surface (2221) being larger at the front and smaller at the rear, and a claw head (1221) is formed at the rear end of the elastic claw sleeve (122), the claw head (1221) being sandwiched between the inner conical surface (2221) and the inner support core column (223).

4. The highly efficient maintenance electrical connection device according to claim 1, characterized in that: The rear end portion of the joint housing (11) is adapted to be plugged into the connecting portion (211).

5. The highly efficient maintenance electrical connection device according to claim 4, characterized in that: A sealing ring (14) is provided between the rear end of the joint housing (11) and the inner wall of the connecting portion (211).

6. The highly efficient maintenance electrical connection device according to claim 4, characterized in that: The joint housing (11) and the main housing (21) are connected via fasteners.

7. The highly maintainable electrical connection device according to claim 1, characterized in that: The connector body (2) comprises a bracket (23), the bracket (23) being arranged in the main housing (21), the bracket (23) being formed with a bayonet (231), the bayonet (231) being bayoneted to the outer side of the corresponding internal terminal (22).

8. The highly efficient maintenance electrical connection device according to claim 7, characterized in that: An inwardly convex positioning piece (2311) is formed in the bayonet (231), a card slot (224) is formed outside the internal terminal (22), and the inwardly convex positioning piece (2311) is adapted to be arranged in the card slot (224).

9. The highly efficient maintenance electrical connection device according to claim 7, characterized in that: An inner step (213) and an inner convex buckle (2101) are formed in the main shell (21); the inner convex buckle (2101) is arranged on the front side of the inner step (213); and the edge of the bracket (23) is arranged between the inner convex buckle (2101) and the inner step (213).

10. The highly efficient maintenance electrical connection device according to claim 1, characterized in that: An external socket (121) is formed at the front end of the external terminal (12), a first slit (1210) distributed in a circumferential direction is formed on the external socket (121), and a spring coil (123) is sleeved at the front end of the external socket (121).

Images