Charging pile easy to disassemble and assemble

Abstract

The utility model discloses a charging pile easy to disassemble and assemble, which comprises a fixed frame, a frame body, a U-shaped bracket, a bus copper bar, a PCB (Printed Circuit Board), a PCB mounting plate, current-carrying clamping terminals and a connecting copper bar, and is characterized in that the current-carrying clamping terminals are respectively arranged at the upper end part of the PCB at intervals and are respectively arranged below the bus copper bar in a manner of moving up and down; the current-carrying clamping terminal comprises a rigid metal shell and an elastic metal current-carrying clamp, the upper end part of the rigid metal shell is provided with a containing groove, the elastic metal current-carrying clamp is embedded in the containing groove, the copper busbar is detachably embedded in the elastic metal current-carrying clamp, two side walls of the elastic metal current-carrying clamp are respectively provided with a deformation groove in a concave manner, and the deformation grooves are formed in the two side walls of the elastic metal current-carrying clamp. The two side walls of the elastic metal current-carrying clamp abut against the inner side walls of the containing groove respectively. According to the technical scheme of the utility model, the assembly, disassembly and maintenance between the copper bus bar and the PCB are more convenient and faster, the operation is simple, and mass production is easy.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, in particular to a charging pile which is easy to assemble and disassemble. Background Art

[0002] A charging pile refers to a power supply cluster that converts AC to DC. It needs to be equipped with corresponding charging piles as the output end. The concept of a charging pile emerged with the emergence of a one-to-many charging mode. It is a form of efficient use of power modules and reasonable distribution of charging power. Therefore, the charging pile can: 1. Meet the different power requirements of charging various models, improve the charging conversion efficiency and equipment utilization of charging facilities. 2. Meet the needs of high-rate charging of batteries, so that the charging equipment invested now can be used continuously in the future.

[0003] Although the standards for charging pile interfaces and other standards have been unified, the problem of "upward compatibility" has not been effectively solved. With the continuous advancement of battery technology, the demand for charging facilities for new energy vehicles will continue to increase. Whether the charging piles built now are suitable for future new energy vehicles has also become a major problem facing the industry. When charging, the charging pile does not need to consider issues such as charging rate and battery capacity, but only needs to charge according to the power required by the battery. In the future, when the battery energy density increases and the battery capacity increases, the charging pile can still be charged by increasing the charging power, thus effectively solving the problem of "upward compatibility" of the charging pile.

[0004] At present, the assembly of the busbars of charging piles on the market is mainly completed by fixed screw terminals or plug-in terminals:

[0005] a. Fixed screw terminals are used, which are low in cost, but the assembly operation is troublesome, which is not conducive to large-scale production and inconvenient for later disassembly and maintenance;

[0006] b. The use of plug-in terminals is costly and relatively troublesome to assemble. A cable is required to connect one end of the terminal to the busbar, which is also inconvenient for assembly and subsequent disassembly and maintenance. Utility Model Content

[0007] The main purpose of the utility model is to provide a charging stack that is easy to disassemble and assemble, aiming to solve the technical problems that the existing charging stacks are troublesome to assemble and operate, not conducive to large-scale production, and inconvenient to disassemble and maintain later.

[0008] To achieve the above-mentioned purpose, the utility model provides an easily disassembled charging stack, comprising a fixed frame, a frame body, a U-shaped bracket, a busbar, a PCB board, a PCB board mounting plate, a current-carrying clamping terminal, a connecting copper bar, an insulating rubber pad and a second screw, wherein the frame body is detachably arranged at the upper end and the lower end of the fixed frame, the U-shaped bracket is respectively arranged at the two ends of a side of the frame body close to the fixed frame, and the two ends of the U-shaped bracket are respectively fixedly connected to the two side walls of the frame body, the busbar is respectively arranged above the frame body in parallel and at intervals, and the two ends of the busbar are respectively fixedly connected to the upper end of the U-shaped bracket, the PCB board mounting plate is respectively arranged in parallel and at intervals in the frame body, the PCB board is arranged on the side wall of the PCB board mounting plate, the current-carrying clamping terminals are respectively arranged at intervals at the upper end of the PCB board, the current-carrying clamping terminals can be movably arranged up and down below the busbar, and the current-carrying clamping terminals It comprises a rigid metal shell and an elastic metal current-carrying clamp, wherein the upper end portion of the rigid metal shell is provided with a receiving groove, the elastic metal current-carrying clamp is embedded in the receiving groove, and the bus copper bar is detachably embedded in the elastic metal current-carrying clamp, both side walls of the elastic metal current-carrying clamp are recessed with a deformation groove, the two outer side walls of the bus copper bar can respectively abut against the inner side wall of the elastic metal current-carrying clamp, the two outer side walls of the elastic metal current-carrying clamp respectively abut against the inner side wall of the receiving groove, the connecting copper bars are respectively arranged on the outer side of the frame in parallel and at intervals, the front end portion of the connecting copper bar is respectively detachably fixedly connected to a side wall of the PCB board away from the fixed frame, the bus copper bar is used to be electrically connected to the charging module, the insulating rubber pads are respectively arranged on the lower end wall of the frame, the lower end wall of the insulating rubber pads is respectively recessed with a third threaded hole, the rear end portion of the connecting copper bar is recessed with a second through hole, the second screw is penetrated through the second through hole, and is screwed into the third threaded hole.

[0009] Optionally, two side walls of the elastic metal current-carrying clamp are respectively provided with a plurality of open grooves spaced apart along the width direction and extending along the length direction.

[0010] Optionally, the outer side wall of the elastic metal current-carrying clamp is provided with a metal coating.

[0011] Optionally, a limit pin is convexly provided on the rear end wall of the lower end of the elastic metal current-carrying clamp, and a limit hole is concavely provided on the rear end wall of the lower end of the rigid metal shell, and the limit pins are detachably embedded in the limit holes.

[0012] Optionally, it also includes a screw rod and a second nut, and the two inner side walls of the frame body are respectively provided with a plurality of first connecting plates, and the first connecting plates are respectively provided with a first threaded hole, and the two ends of the PCB board mounting plate are respectively provided with a second connecting plate, and the second connecting plates are respectively provided with a U-shaped groove, and the second nuts are respectively screwed on the screw rod, and the screw rod is passed through the U-shaped groove, and the upper end of the screw rod is screwed into the first threaded hole, and the second nut can be respectively abutted against the upper end wall or the lower end wall of the U-shaped groove, and the lower end of the screw rod is provided with a handle, and the bus copper bar and the elastic metal current-carrying clamp can be fixed or separated by rotating the screw rod.

[0013] Optionally, it also includes a first screw, a third mounting plate is protruding from both ends of the PCB board mounting plate, and a first through hole is recessed on the third mounting plate. A plurality of second threaded holes are recessed on the lower end walls at both ends of the frame body, and the first screws are respectively passed through the first through holes and screwed into the second threaded holes.

[0014] Optionally, a plurality of fourth connecting plates are protruding from the upper end of the U-shaped bracket, and the lower ends of the fourth connecting plates are detachably fixedly connected to the busbar by screws.

[0015] Optionally, it also includes a fifth connecting plate and a third screw, the fifth connecting plate is respectively arranged at the lower end of the PCB board mounting plate, the fifth connecting plate is respectively recessed with a fourth threaded hole, the front end of the connecting copper bar is recessed with a plurality of third through holes, the third screws are respectively passed through the third through holes, and screwed into the fourth threaded hole.

[0016] The technical solution of the utility model has the following beneficial effects: the technical solution of the utility model is that the current-carrying clamping terminals are respectively arranged at intervals on the upper end of the PCB board, and the current-carrying clamping terminals can be movably arranged up and down below the busbar, the current-carrying clamping terminals include a rigid metal shell and an elastic metal current-carrying clamp, the upper end of the rigid metal shell is provided with a receiving groove, the elastic metal current-carrying clamp is embedded in the receiving groove, and the busbar is detachably embedded in the elastic metal current-carrying clamp, and the two side walls of the elastic metal current-carrying clamp are both recessed with a deformation groove, the two side walls of the busbar can respectively abut against the inner side walls of the elastic metal current-carrying clamp, and the two side walls of the elastic metal current-carrying clamp respectively abut against the inner side walls of the receiving groove, Therefore, the bus copper bar and the PCB board can be assembled and disassembled by plugging and unplugging, and the bus copper bar and the current-carrying clamping terminal can be clamped and separated and disassembled by twisting the screw, which effectively solves the problem that the bus copper bar and the current-carrying clamping terminal are difficult to clamp and separate due to the large clamping force, thereby making the assembly and disassembly between the bus copper bar and the PCB board more convenient and quick, without the need to use tools to twist the screws, simple operation, and convenient later disassembly and maintenance, greatly simplifying the production assembly and later maintenance processes, which is conducive to large-scale automated production, improves assembly efficiency, and reduces costs. In addition, the elastic metal current-carrying clamp and the bus copper bar are firmly and reliably clamped, and the contact is stable and reliable, which can meet the needs of large current transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of an easily disassembled charging stack according to an embodiment of the utility model;

[0019] Figure 2 This is a partial structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model;

[0020] Figure 3 This is a schematic diagram of another part of the structure of an easily disassembled charging stack according to an embodiment of the utility model;

[0021] Figure 4 It is a partial structural schematic diagram of another perspective of an easily disassembled charging stack according to an embodiment of the utility model;

[0022] Figure 5 This is another partial structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model;

[0023] Figure 6 This is another partial structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model;

[0024] Figure 7 This is a schematic diagram of a partially exploded structure of an easily disassembled charging stack according to an embodiment of the utility model;

[0025] Figure 8 This is another partial structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model;

[0026] Fig. 9 This is another partially exploded structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model;

[0027] Fig.10 This is another partial structural schematic diagram of an easily disassembled charging stack according to an embodiment of the utility model.

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0032] The utility model provides a charging stack which is easy to assemble and disassemble.

[0033] like Figures 1 to 10As shown, in one embodiment of the utility model, the easily disassembled charging stack includes a fixed frame 101, a frame body 102, a U-shaped bracket 103, a busbar 104, a PCB board 105, a PCB board mounting plate 106, a current-carrying clamping terminal 107, a connecting copper bar 108, an insulating rubber pad 120 and a second screw (not shown). The outer contour of the fixed frame 101 is a rectangular parallelepiped structure, the frame body 102 is detachably arranged at the upper end and the lower end of the fixed frame 101, and the U-shaped bracket 103 is respectively arranged at both ends of a side of the frame body 102 close to the fixed frame, and the two ends of the U-shaped bracket 103 are respectively The two side walls of the frame 102 are fixedly connected, the bus copper bars 104 are respectively arranged above the frame 102 in parallel and at intervals, and the two ends of the bus copper bars 104 are respectively fixedly connected to the upper end of the U-shaped bracket 103, the PCB board mounting plates 106 are respectively arranged in parallel and at intervals in the frame 102, the PCB board 105 is arranged on the side wall of the PCB board mounting plate 106, the current-carrying clamping terminals 107 are respectively arranged at intervals on the upper end of the PCB board 105, and the current-carrying clamping terminals 107 are respectively arranged below the bus copper bars 104 in an upward and downward movable manner, and the current-carrying clamping terminals 107 include a rigid metal shell 1071 and an elastic The metal current-carrying clip 1072, the upper end of the rigid metal shell 1071 is provided with a receiving groove 10711, the elastic metal current-carrying clip 1072 is embedded in the receiving groove 10711, and the bus copper bar 104 is detachably embedded in the elastic metal current-carrying clip 1072, and the two side walls of the elastic metal current-carrying clip 1072 are concavely provided with a deformation groove 10721, and the two outer side walls of the bus copper bar 104 can respectively abut against the inner side wall of the elastic metal current-carrying clip 1072, and the two outer side walls of the elastic metal current-carrying clip 1072 respectively abut against the inner side wall of the receiving groove 10711, and the connecting copper bars 108 are respectively arranged in parallel and spaced apart on the frame 1 02, the front end of the connecting copper bus 108 is detachably fixedly connected to the side wall of the PCB board 105 away from the fixed frame 101, and the middle of the connecting copper bus 108 is detachably fixedly connected to the side wall of the frame body 102 away from the fixed frame 101. The connecting copper bus 108 is used to be electrically connected to the charging gun, and the bus copper bus 104 is used to be electrically connected to the charging module. The lower end wall of the insulating rubber pad 120 is respectively recessed with a third threaded hole 1201, and the rear end of the connecting copper bus 108 is recessed with a second through hole 1081, and the second screw is penetrated through the second through hole 1081 and screwed into the third threaded hole 1201.

[0034] Specifically, the two outer side walls of the elastic metal current-carrying clamp 1072 are respectively abutted against the inner side walls of the accommodating groove 10711, and the rigid metal shell limits the elastic metal current-carrying clamp, so that the elastic metal current-carrying clamp can maintain a certain clamping force for a long time to prevent the busbar from loosening.

[0035] Specifically, the two side walls of the elastic metal current-carrying clamp 1072 are respectively provided with a plurality of open grooves 10722 extending in the length direction at intervals along the width direction, so that the elastic metal current-carrying clamp is divided into a plurality of independently deformable areas. Because the metal surface is not an absolutely flat surface, when the outer side wall of the bus copper bar becomes uneven, the elastic metal current-carrying clamp has a plurality of independently deformable areas, thereby effectively ensuring that the elastic metal current-carrying clamp and the bus copper bar can be in full contact, thereby avoiding poor contact.

[0036] Specifically, the outer wall of the elastic metal current-carrying clamp 1072 is provided with a metal coating, which plays an anti-oxidation protective role. Preferably, in this embodiment, the metal coating is a nickel coating. The electroplated nickel layer has high stability in the air. Since metal nickel has a strong passivation ability, an extremely thin passivation film can be quickly generated on the surface, which can resist corrosion from the atmosphere, alkali and certain acids, and play an anti-oxidation role. The hardness of the nickel coating is relatively high, which can improve the wear resistance of the surface of the elastic metal current-carrying clamp and effectively extend the service life of the elastic metal current-carrying clamp.

[0037] Specifically, a limit pin 10723 is convexly provided on the rear end wall of the lower end of the elastic metal current-carrying clamp 1072, and a limit hole 10712 is concavely provided on the rear end wall of the lower end of the rigid metal shell 1071. The limit pins 10723 are respectively detachably embedded in the limit holes 10712, which play a role of positioning and limiting the elastic metal current-carrying clamp, making the assembly of the elastic metal current-carrying clamp and the rigid metal shell more convenient, and can prevent the elastic metal current-carrying clamp from being displaced and disconnected, thereby improving the reliability of the connection.

[0038] Specifically, it also includes a screw rod 109 and a second nut 110. The two inner side walls of the frame body 102 are respectively convexly provided with a plurality of first connecting plates 1021, and the first connecting plates 1021 are respectively concavely provided with a first threaded hole 1022. The two ends of the PCB board mounting plate 106 are respectively convexly provided with a second connecting plate 1061, and the second connecting plates 1061 are respectively concavely provided with a U-shaped groove 1062. The second nut 110 is respectively screwed on the screw rod 109, and the screw rod 109 is penetrated in the U-shaped groove 1062. The upper end of the screw rod 109 is screwed in the first threaded hole 1022, and the second nut 110 can be respectively screwed with the U-shaped groove 1062. The upper end wall or the lower end wall is abutted against the screw 109, and a handle 1091 is provided at the lower end of the screw rod 109. In order to ensure the current carrying capacity of the current-carrying clamping terminal, the clamping force of the current-carrying clamping terminal needs to be relatively large. Multiple current-carrying clamping terminals need to be clamped and separated from the bus copper bar at the same time, which is almost impossible to complete by manpower. At this time, the bus copper bar 104 can be fixed or separated from the elastic metal current-carrying clamp 1072 by rotating the screw rod 109, thereby making the clamping and separation between the bus copper bar and the current-carrying clamping terminal more convenient, effectively solving the problem of difficult clamping and separation between the bus copper bar and the current-carrying clamping terminal due to the large clamping force.

[0039] Specifically, it also includes a first screw (not shown), and a third mounting plate 1063 is convexly provided at both ends of the PCB board mounting plate 106, and a first through hole 1064 is recessed in the third mounting plate 1063. A plurality of second threaded holes 1023 are recessed in the lower end walls at both ends of the frame 102, and the first screws are respectively passed through the first through holes 1064 and screwed into the second threaded holes 1023. The PCB board mounting plate is further fixed by the first screw, which can prevent the PCB board mounting plate from loosening and increase reliability.

[0040] Specifically, a plurality of fourth connecting plates 1031 are protruded from the upper end of the U-shaped bracket 103, and the lower ends of the fourth connecting plates 1031 are detachably fixedly connected to the bus copper bus 104 by screws, so that the assembly and disassembly between the bus copper bus and the U-shaped bracket are more convenient, firm and reliable.

[0041] Specifically, it also includes a fifth connecting plate 130 and a third screw (not shown in the figure). The fifth connecting plates 130 are respectively arranged at the lower end of the PCB board mounting plate 106. The fifth connecting plates 130 are respectively recessed with a fourth threaded hole 1301. The front end of the connecting copper bus 108 is recessed with a plurality of third through holes 1082. The third screws are respectively passed through the third through holes 1082 and screwed into the fourth threaded holes 1301.

[0042] Specifically, the use process of the utility model is as follows:

[0043] The connecting copper bar is electrically connected to the charging gun, and the bus copper bar is electrically connected to the charging module. At this time, the bus copper bar is located above the current-carrying clamping terminal. The second nut on the screw is screwed to the bottom of the U-shaped groove, and the second nut is abutted against the lower end wall of the U-shaped groove. The screw is rotated by the handle at the lower end of the screw. Under the drive of the screw, the PCB board mounting plate is raised until the bus copper bar is stuck in the elastic metal current-carrying clamp of the current-carrying clamping terminal. The bus copper bar is firmly clamped and fixed by the elastic force of the elastic metal current-carrying clamp to achieve rapid assembly and conduction; when disassembly and maintenance are required , screw the second nut on the screw to the top of the U-shaped groove, and make the second nut abut against the upper end wall of the U-shaped groove, rotate the screw through the handle at the lower end of the screw, and drive the screw to lower the PCB mounting plate until the busbar is separated from the elastic metal current-carrying clamp, thereby achieving rapid disassembly and assembly, greatly simplifying the production assembly and later maintenance process, which is conducive to large-scale automated production, improves assembly efficiency, and reduces costs. The elastic metal current-carrying clamp and the busbar are firmly and reliably clamped, and the contact is stable and reliable, which can meet the needs of large current transmission.

[0044] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A charging stack that is easy to disassemble and assemble, characterized in that: The utility model comprises a fixed frame, a frame body, a U-shaped bracket, a bus copper bar, a PCB board, a PCB board mounting plate, a current-carrying clamping terminal, a connecting copper bar, an insulating rubber pad and a second screw, wherein the frame body is detachably arranged at the upper end and the lower end of the fixed frame, the U-shaped bracket is respectively arranged at the two ends of a side of the frame body close to the fixed frame, and the two ends of the U-shaped bracket are respectively fixedly connected to the two side walls of the frame body, the bus copper bar is respectively arranged above the frame body in parallel and at intervals, and the two ends of the bus copper bar are respectively fixedly connected to the upper end of the U-shaped bracket, the PCB board mounting plates are respectively arranged in parallel and at intervals in the frame body, the PCB board is arranged on the side walls of the PCB board mounting plates, the current-carrying clamping terminals are respectively arranged at intervals at the upper end of the PCB board, the current-carrying clamping terminals can be movably arranged up and down below the bus copper bar, and the current-carrying clamping terminals comprise a rigid metal shell and an elastic metal The current-carrying clamp, the upper end of the rigid metal shell is provided with a receiving groove, the elastic metal current-carrying clamp is embedded in the receiving groove, and the bus copper bar is detachably embedded in the elastic metal current-carrying clamp, both side walls of the elastic metal current-carrying clamp are recessed with a deformation groove, the two outer side walls of the bus copper bar can respectively abut against the inner side wall of the elastic metal current-carrying clamp, the two outer side walls of the elastic metal current-carrying clamp respectively abut against the inner side wall of the receiving groove, the connecting copper bars are respectively arranged on the outside of the frame in parallel and at intervals, the front end of the connecting copper bar is respectively detachably fixedly connected to a side wall of the PCB board away from the fixed frame, the bus copper bar is used to be electrically connected to the charging module, the insulating rubber pads are respectively arranged on the lower end wall of the frame, the lower end wall of the insulating rubber pad is respectively recessed with a third threaded hole, the rear end of the connecting copper bar is recessed with a second through hole, the second screw is passed through the second through hole, and is screwed into the third threaded hole.

2. The easily disassembled charging stack according to claim 1, characterized in that: The two side walls of the elastic metal current-carrying clamp are respectively recessed with a plurality of opening grooves extending along the length direction at intervals along the width direction.

3. The easily disassembled charging stack according to claim 1, characterized in that: The outer side wall of the elastic metal current-carrying clamp is provided with a metal coating.

4. The easily disassembled charging stack according to claim 1, characterized in that: A limiting pin is convexly provided on the rear end wall of the lower end of the elastic metal current-carrying clamp, and a limiting hole is concavely provided on the rear end wall of the lower end of the rigid metal shell. The limiting pins are detachably embedded in the limiting holes.

5. The easily disassembled charging stack according to claim 1, characterized in that: It also includes a screw and a second nut. The two inner side walls of the frame are respectively provided with a plurality of first connecting plates, and the first connecting plates are respectively provided with a first threaded hole. The two ends of the PCB board mounting plate are respectively provided with a second connecting plate, and the second connecting plates are respectively provided with a U-shaped groove. The second nuts are respectively screwed on the screws, and the screws are inserted into the U-shaped grooves. The upper end of the screw is screwed into the first threaded hole. The second nut can be respectively abutted against the upper end wall or the lower end wall of the U-shaped groove. A handle is provided at the lower end of the screw, and the busbar is fixed or separated from the elastic metal current-carrying clamp by rotating the screw.

6. The easily disassembled charging stack according to claim 1, characterized in that: It also includes a first screw, a third mounting plate is protruded from both ends of the PCB board mounting plate, a first through hole is recessed in the third mounting plate, a plurality of second threaded holes are recessed in the lower end walls at both ends of the frame, the first screw is respectively passed through the first through hole and screwed into the second threaded hole.

7. The easily disassembled charging stack according to claim 1, characterized in that: A plurality of fourth connecting plates are protruded from the upper ends of the U-shaped brackets, and the lower ends of the fourth connecting plates are detachably fixedly connected to the busbars by screws.

8. The easily disassembled charging stack according to claim 1, characterized in that: It also includes a fifth connecting plate and a third screw. The fifth connecting plate is respectively arranged at the lower end of the PCB board mounting plate. The fifth connecting plate is respectively recessed with a fourth threaded hole. The front end of the connecting copper bar is recessed with a plurality of third through holes. The third screws are respectively passed through the third through holes and screwed into the fourth threaded holes.

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