Multi-turn driven electromagnetic track emitter

Abstract

The invention discloses a multi-turn driven electromagnetic track launcher which comprises a positive guide rail, a plurality of upper switching guide rails, a negative guide rail, a plurality of lower switching guide rails, a thrust assembly and a breech feed device. The thrust assembly is provided with an armature, the armature is provided with a plurality of armature strips corresponding to the positive guide rail, the upper switching guide rail, the negative guide rail and the lower switching guide rail, and the armature strips are in sliding contact with the rail surfaces of the positive guide rail, the upper switching guide rail, the negative guide rail and the lower switching guide rail for electric conduction; the breech feed device is provided with a switching copper bar, and the two ends of the switching copper bar are used for making contact with the end of the upper switching guide rail and the end of the lower switching guide rail for electric conduction. By arranging the guide rail mechanism composed of the positive electrode guide rail, the multiple upper switching guide rails, the negative electrode guide rail and the multiple lower switching guide rails and the transmitting mechanism composed of the multiple armatures, the inductance gradient of the transmitter can be greatly improved, and higher transmitting kinetic energy is achieved under the condition that the current amplitude does not need to be increased.

Description

Technical Field

[0001] The invention relates to a multi-turn driven electromagnetic track transmitter, belonging to the technical field of electromagnetic transmission. Background Art

[0002] Electromagnetic rail launch is a type of electromagnetic launch technology. It accelerates the armature by generating electromagnetic force through the release of pulsed high-power electric energy in the armature-guide rail loop. Traditional electromagnetic rail launch technology uses a single-turn loop consisting of a single armature and positive and negative rails. The transmitter inductance gradient is small and the efficiency is low. In order to improve the launch efficiency, an enhanced electromagnetic rail launch device has emerged. By adding a secondary rail outside the main rail to form a superimposed magnetic field to increase the electromagnetic force driving the armature, this method still has limited effect on the improvement of the transmitter inductance gradient.

[0003] Therefore, in order to achieve ultra-high speed, high-amplitude pulse electric energy is required, and the current flowing through the armature and guide rail is relatively large. The resulting problems are: low energy conversion efficiency, rapid temperature rise of the armature and guide rail, which is not conducive to extending the life of the guide rail. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a multi-turn driven electromagnetic track launcher, aiming to improve energy conversion efficiency and enhance launch kinetic energy.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions: The present invention provides a multi-turn driven electromagnetic track transmitter, comprising: Positive rail; A plurality of upper transfer rails arranged in parallel and at intervals with the positive electrode rail; A negative electrode rail, located below the positive electrode rail; A plurality of lower transfer rails arranged in parallel and at intervals with the negative electrode rail; A thrust assembly is provided with an armature; the armature has a plurality of armature bars corresponding to the positive rail, the upper transfer rail, the negative rail and the lower transfer rail, and is slidably in contact with the rail surfaces of the positive rail, the upper transfer rail, the negative rail and the lower transfer rail for electrical conduction; The breech-end power feeding device is provided with a transfer copper bar; the two ends of the transfer copper bar are used to contact and conduct electricity with the ends of the upper transfer guide rail and the lower transfer guide rail respectively.

[0006] Further, it also includes a shell having a launch cavity for accommodating the positive rail, the negative rail, the upper transfer rail and the lower transfer rail, and the shell has openings at both ends of the launch cavity; The breech feeding device is used to close one end of the firing cavity.

[0007] Furthermore, the breech block feeding device comprises: A tailstock, which is a frame-shaped structure and butts against an outer edge of an opening at one end of the housing; A cover member, which is movably connected to the tailstock and is used to close one end of the firing chamber; The transfer copper bar is movably connected to a side of the cover plate component facing the emission chamber through an elastic element; when the cover plate component is closed, the elastic element applies an axial thrust to the transfer copper bar.

[0008] Furthermore, an upper insulating plate and a lower insulating plate which are opposite to each other are arranged in the launch cavity; The upper insulating plate has a plurality of T-shaped slots for accommodating the positive rail and the upper transfer rail; The lower insulating plate has a plurality of T-shaped grooves for accommodating the negative electrode rail and the lower transfer rail; The depth of the T-shaped groove is greater than the cross-sectional heights of the positive electrode rail, the upper transfer rail, the negative electrode rail and the lower transfer rail.

[0009] Furthermore, a left insulating plate and a right insulating plate opposite to each other are arranged in the launch chamber; The left insulating plate and the right insulating plate are both fixedly connected to the upper insulating plate and the lower insulating plate.

[0010] Further, the armature is encapsulated in an encapsulating insulator, and ends of the armature are exposed from the encapsulating insulator to contact the positive rail, the upper transfer rail, the negative rail, and the lower transfer rail.

[0011] Furthermore, one end of the positive rail and the negative rail is located at the end side of the firing cavity facing the breech feeding device, and is respectively connected to a positive bus and a negative bus; The cover plate assembly is provided with a notch capable of keeping the positive busbar and the negative busbar exposed.

[0012] Furthermore, the cover plate component comprises: A lower cover plate is movably connected to the tailstock; the lower cover plate is provided with a receiving groove penetrating along the thickness direction; the transfer copper bar can be movably embedded in the receiving groove; A middle cover plate, which is located on one side of the lower cover plate and is connected to the transfer copper busbar via an elastic element; The upper cover plate is located on a side of the middle cover plate away from the lower cover plate and is fixedly connected to the middle cover plate and the lower cover plate.

[0013] Furthermore, a rotatable eccentric wheel is mounted on a side of the tailstock facing the cover member via an eccentric wheel screw; The cover plate component is provided with a limiting groove at a position corresponding to the eccentric wheel; When the cover plate component and the tailstock are closed, the eccentric wheel can be partially embedded in the limiting groove by rotating the eccentric wheel.

[0014] Furthermore, the transfer copper busbar includes a plurality of copper bars, and two ends of each of the copper bars are respectively connected to one of the elastic elements.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a multi-turn driven electromagnetic track launcher. By providing a multi-turn driven electromagnetic track consisting of a positive rail, a plurality of upper transfer rails, a negative rail, and a plurality of lower transfer rails, and an armature consisting of a plurality of armature bars, a corresponding thrust assembly is formed. The electromagnetic track launcher of the present invention can greatly improve the inductance gradient of the launcher, and achieve higher launch kinetic energy without increasing the current amplitude. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a multi-turn driven electromagnetic track transmitter provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the opening state of the tail feeding device of the multi-turn driven electromagnetic rail launcher provided by an embodiment of the present invention; Figure 3 is a perspective view of a housing of a multi-turn driven electromagnetic track transmitter provided by an embodiment of the present invention; Figure 4 It is a structural schematic diagram of a thrust assembly of a multi-turn driven electromagnetic rail launcher provided by an embodiment of the present invention; Figure 5 It is a disassembled schematic diagram of a tail feed device of a multi-turn driven electromagnetic rail launcher provided by an embodiment of the present invention; In the figure, 1. positive rail; 2. negative rail; 3. upper transfer rail; 4. lower transfer rail; 5. lower insulating plate; 6. left insulating plate; 7. upper insulating plate; 8. right insulating plate; 9. positive busbar; 10. negative busbar; 11. copper busbar screw; 12. tailstock; 13. housing; 14. armature; 15. encapsulated insulator; 16. eccentric wheel; 17. eccentric wheel screw; 18. upper cover plate; 19. middle cover plate; 20. lower cover plate; 21. transfer copper busbar; 22. shaft pin; 23. shaft sleeve; 24. shaft cap; 25. shaft cap screw; 26. fastening screw; 27. elastic element; 28. fastening screw; 29. ​​fastening nut; 30. cover plate screw; 31. cover plate handle. DETAILED DESCRIPTION

[0017] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances. Example

[0020] See also Figure 1 This embodiment introduces a multi-turn driven electromagnetic rail launcher, comprising: a positive rail 1, a plurality of upper transfer rails 3 arranged in parallel and at intervals with the positive rail 1, a negative rail 2 located below the positive rail 1, a plurality of lower transfer rails 4 arranged in parallel and at intervals with the negative rail 2, a thrust assembly and a tail feed device. The thrust assembly is provided with an armature 14, which is a V-shaped bar. The armature 14 has a plurality of armature bars corresponding to the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4, and can slidably contact and conduct electricity with the rail surfaces of the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4. The tail feed device is provided with a transfer copper bar 21, the two ends of which are used to contact and conduct electricity with the ends of the upper transfer rail 3 and the lower transfer rail 4 respectively.

[0021] In addition, it also includes a shell 13 with a launch cavity, which is used to accommodate the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4. The shell 13 has openings at both ends of the launch cavity; the breech feeding device is used to close one end of the launch cavity, and this end is the breech of the launcher.

[0022] Specifically, the breech block feeding device includes a tail seat 12 and a cover plate component: the tail seat 12 is a frame-type structure and is butted against the outer edge of an opening at one end of the housing 13; the cover plate component is movably connected to the tail seat 12; and the transfer copper bar 21 is movably connected to the cover plate component through an elastic element 27. The cover plate component is configured as an openable and closable structure, and the operator can open or close the breech block by controlling the opening and closing state of the cover plate component. When the cover plate component is closed, the transfer copper bar 21 abuts against the upper transfer rail 3 and the lower transfer rail 4, and the elastic element 27 is compressed. The elastic element 27 can apply an axial thrust to the transfer copper bar 21, so that the transfer copper bar 21 contacts the upper transfer rail 3 and the lower transfer rail 4 more stably, thereby ensuring the stability of the overall current path.

[0023] More specifically, the transfer copper bar 21 includes a plurality of copper bars, each of which is connected to an elastic element 27 at both ends. Since the ends of each copper bar are driven by the elastic element 27, they can contact the upper transfer rail 3 and the lower transfer rail 4 more stably and reliably.

[0024] Exemplarily, in the present embodiment, the elastic element 27 is an X-shaped spring having four contacts, two of which are in contact with the copper strip, and the other two are connected to the cover plate component.

[0025] Specifically, in this embodiment, the X-shaped spring can be fixed by two V-shaped spring pieces, the concave surfaces of the two V-shaped spring pieces are separated, and the connection is located at the convex part of the V-shaped spring pieces, and the two V-shaped spring pieces are respectively connected to the cover plate component and the copper strip. When the cover plate component is closed, the two V-shaped spring pieces interact with each other to form an elastic force outward, thereby applying a pre-tightening force to the copper strip.

[0026] For example, for the fixing method of the positive electrode rail 1, the upper transfer rail 3, the negative electrode rail 2 and the lower transfer rail 4 in this embodiment, please refer to Figure 2 and Figure 3 , specifically as follows: an upper insulating plate 7 and a lower insulating plate 5 are arranged in the launch cavity, which are opposite to each other. The upper insulating plate 7 has a plurality of T-shaped grooves for the positive rail 1 and the upper transfer rail 3 to be embedded. The lower insulating plate 5 has a plurality of T-shaped grooves for the negative rail 2 and the lower transfer rail 4 to be embedded. The cross-sections of the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4 are corresponding T-shaped structures, and the depth of the T-shaped groove is greater than the cross-sectional height of the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4. The rail surfaces of the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4 are at a certain distance from the notch of the T-shaped groove, so that the upper insulating plate 7 and the lower insulating plate 5 fully isolate the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4, which can effectively improve the insulation between turns.

[0027] Also, see Figure 2 and Figure 3 In this embodiment, the cross section of the shell 13 is a square frame structure, and the outer corners are rounded transition. The launch chamber is provided with a left insulating plate 6 and a right insulating plate 8 opposite to each other; the left insulating plate 6 and the right insulating plate 8 are fixedly connected to the upper insulating plate 7 and the lower insulating plate 5. The left insulating plate 6, the right insulating plate 8, the upper insulating plate 7 and the lower insulating plate 5 form a stable frame-shaped support structure, and the outer walls of the insulating plate 6, the right insulating plate 8, the upper insulating plate 7 and the lower insulating plate 5 are tightly fitted and fixed to the four side walls of the shell 13.

[0028] Similarly, see Figure 3 and Figure 4 The armature 14 is encapsulated in an encapsulating insulator 15, and the end of the armature 14 is exposed from the encapsulating insulator 15 to be able to contact the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4. A part of the exposed section of the armature 14 is slidably embedded in the above-mentioned T-shaped groove and contacts the positive rail 1, the upper transfer rail 3, the negative rail 2 and the lower transfer rail 4.

[0029] It should be added that one end of the positive rail 1 and the negative rail 2 are located at the end side of the firing chamber facing the breech feeding device, and are respectively connected with a positive bus 9 and a negative bus 10; the cover plate assembly is provided with a notch capable of keeping the positive bus 9 and the negative bus 10 exposed. The positive bus 9 and the negative bus 10 are used to connect external cables. Among them, the positive bus 9 and the negative bus 10 are respectively fixedly installed at the ends of the positive rail 1 and the negative rail 2 by copper bus screws 11.

[0030] For example, see Figure 5 The cover plate component includes a lower cover plate 20, a middle cover plate 19 and an upper cover plate 18. The lower cover plate 20 is movably connected to the tailstock 12; the lower cover plate 18 is provided with a receiving groove penetrating along the thickness direction; the transfer copper bar 21 is movably embedded in the receiving groove; the middle cover plate 19 is located at one side of the lower cover plate 20, and is connected to the transfer copper bar 21 through an elastic element 27; the upper cover plate 18 is located at a side of the middle cover plate 19 away from the lower cover plate 20, and is fixedly connected to the middle cover plate 19 and the lower cover plate 20. The tailstock 12 is provided with an axle pin 22, and the lower cover plate 20 is correspondingly provided with a shaft sleeve 23. The tailstock 12 and the lower cover plate 20 are hinged by the corresponding axle pin 22 and shaft sleeve 23. Based on the axle pin 22 and shaft sleeve 23, a shaft cap 24 for providing a limit for the shaft sleeve 23 and a shaft cap screw 25 for fixing the shaft cap 24 with the axle pin 22 are correspondingly configured, so that the cover plate component and the tailstock 12 are movably hinged, which is convenient for opening and closing the cover plate component. In addition, a cover plate handle 31 for the operator to hold is provided on the upper cover plate 18.

[0031] Among them, see Figure 5, corresponding to the multiple copper bars constituting the transfer copper bar 21, the lower cover plate 20 also has multiple receiving grooves in a strip shape, and each receiving groove is used to accommodate a movable copper bar. The elastic element 27 is fixed on one side of the middle cover plate 19, and each elastic element 27 on the middle cover plate 19 is fixed by a fastening screw 28, and the elastic element 27 and the copper bar are fixed by a fastening screw 26. The upper cover plate 8, the middle cover plate 19 and the lower cover plate 20 are fixed by two cover screws 30 arranged diagonally, and at least the lower cover plate 20 is provided with corresponding threaded holes, and the middle cover plate 19 and the upper cover plate 18 are provided with corresponding through holes, so that the cover screws 30 can be passed through the upper cover plate 18 and the middle cover plate 19 in turn, and finally screwed into the threaded holes on the lower cover plate 20 to fix the upper cover plate 8, the middle cover plate 19 and the lower cover plate 20, and the overall structure is stable.

[0032] For example, see Figure 2 and Figure 5 A rotatable eccentric wheel 16 is installed on the side of the tailstock 12 facing the cover plate member through an eccentric wheel screw 17. The eccentric wheel 16 is provided with a through hole for the eccentric wheel screw 17 to pass through. The eccentric wheel screw 17 is screwed and fixed to the tailstock 12, and serves as the eccentric shaft of the eccentric wheel 16, so that the eccentric wheel 16 can rotate. A limiting groove is provided at the position corresponding to the eccentric wheel 16 of the cover plate member; when the cover plate member and the tailstock 12 are in a closed state, the eccentric wheel 16 can be partially embedded in the limiting groove by rotating the eccentric wheel 16, and the cover plate member is locked and limited. The limiting groove is provided on the edge of the lower cover plate 20. In order to facilitate operation, a joystick is provided on the eccentric wheel 16, and the operator can control the rotation of the eccentric wheel 16 by holding the joystick.

[0033] It should be added that, in the present embodiment, the number of upper transfer rails 3 and lower transfer rails 4 are both four, corresponding to the number of upper transfer rails 3 and lower transfer rails 4, as well as the positive rails 1 and negative rails 2, the number of armatures 14 is four, and the number of copper bars of the transfer copper busbar 21 is four.

[0034] In addition, in order to further improve the inter-turn insulation, the lower insulating plate 5, the left insulating plate 6, the upper insulating plate 7, the right insulating plate 8, the tailstock 12, the upper cover plate 18, the middle cover plate 19, the lower cover plate 20, and the cover plate handle 31 in this embodiment are all made of electrical insulating materials such as epoxy resin or phenolic plastic.

[0035] When in use, the cables are connected to the holes reserved between the positive rail 1 and the positive bus 9, and between the negative rail 2 and the negative bus 10. After the thrust assembly is loaded, the cover is closed, and the eccentric wheel 16 is rotated to the limit groove of the lower cover 20, and a gradual pressing force is applied to the cover. At this time, the elastic element 27 is compressed to generate an elastic self-preload force, which pushes the transfer copper bar 21 to abut against the upper transfer rail 3 and the lower transfer rail 4 to achieve reliable contact. After power is turned on, the cable, the positive rail 1, the negative rail 2, the upper transfer rail 3, the lower transfer rail 4, the positive bus 9, the negative bus 10, the transfer copper bar 21 and the armature 14 form a closed loop. Under the action of the current and the magnetic field, the thrust assembly is accelerated by the huge Lorentz force.

[0036] After the launch is completed, the eccentric wheel 16 is rotated in the reverse direction to make the eccentric wheel 16 rotate out of the groove of the lower cover plate 20. At this time, the cover plate component is loosened and a new thrust assembly can be loaded again. The above process is repeated to achieve the repeated use of the device. Example

[0037] In this embodiment, the elastic element 27 is replaced by a common plastic spring instead of an X-shaped spring, and both ends are respectively connected and fixed to the copper strip and the middle cover plate 19 by bonding. This material is easier to obtain and can reduce the use cost.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure rather than to limit its protection scope. Although the present disclosure has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present disclosure, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the disclosed claims to be approved.

Claims

1. A multi-turn driven electromagnetic track transmitter, characterized in that: include: Positive rail; A plurality of upper transfer rails arranged in parallel and at intervals with the positive electrode rail; A negative electrode rail, located below the positive electrode rail; A plurality of lower transfer rails arranged in parallel and at intervals with the negative electrode rail; A thrust assembly is provided with an armature; the armature has a plurality of armature bars corresponding to the positive rail, the upper transfer rail, the negative rail and the lower transfer rail, and is slidably in contact with the rail surfaces of the positive rail, the upper transfer rail, the negative rail and the lower transfer rail for electrical conduction; The breech-end power feeding device is provided with a transfer copper bar; the two ends of the transfer copper bar are used to contact and conduct electricity with the ends of the upper transfer guide rail and the lower transfer guide rail respectively.

2. The multi-turn driven electromagnetic track transmitter according to claim 1, characterized in that: Also included is a housing having a firing cavity for accommodating a positive rail, a negative rail, an upper transfer rail, and a lower transfer rail, the housing having openings at both ends of the firing cavity; The breech feeding device is used to close one end of the firing cavity.

3. The multi-turn driven electromagnetic track transmitter according to claim 2, characterized in that: The breech feeding device comprises: A tailstock, which is a frame-shaped structure and butts against an outer edge of an opening at one end of the housing; A cover member, which is movably connected to the tailstock and is used to close one end of the firing chamber; The transfer copper bar is movably connected to a side of the cover plate component facing the emission chamber through an elastic element; when the cover plate component is closed, the elastic element applies an axial thrust to the transfer copper bar.

4. The multi-turn driven electromagnetic track transmitter according to claim 1, characterized in that: An upper insulating plate and a lower insulating plate which are opposite to each other are arranged in the emission chamber; The upper insulating plate has a plurality of T-shaped slots for accommodating the positive rail and the upper transfer rail; The lower insulating plate has a plurality of T-shaped grooves for accommodating the negative electrode rail and the lower transfer rail; The depth of the T-shaped groove is greater than the cross-sectional heights of the positive electrode rail, the upper transfer rail, the negative electrode rail and the lower transfer rail.

5. The multi-turn driven electromagnetic track transmitter according to claim 4, characterized in that: The transmitting chamber is provided with a left insulating plate and a right insulating plate which are opposite to each other. The left insulating plate and the right insulating plate are both fixedly connected to the upper insulating plate and the lower insulating plate.

6. The multi-turn driven electromagnetic track transmitter according to claim 1, characterized in that: The armature is encapsulated in an encapsulating insulator, and ends of the armature are exposed from the encapsulating insulator to contact the positive rail, the upper transfer rail, the negative rail, and the lower transfer rail.

7. The multi-turn driven electromagnetic track transmitter according to claim 3, characterized in that: One end of the positive rail and the negative rail is located at the end side of the firing cavity facing the breech feeding device, and is connected to a positive bus and a negative bus respectively; The cover plate assembly is provided with a notch capable of keeping the positive busbar and the negative busbar exposed.

8. The multi-turn driven electromagnetic track transmitter according to claim 3, characterized in that: The cover member comprises: A lower cover plate is movably connected to the tailstock; the lower cover plate is provided with a receiving groove penetrating along the thickness direction; the transfer copper bar can be movably embedded in the receiving groove; A middle cover plate, which is located on one side of the lower cover plate and is connected to the transfer copper busbar via an elastic element; The upper cover plate is located on a side of the middle cover plate away from the lower cover plate and is fixedly connected to the middle cover plate and the lower cover plate.

9. The multi-turn driven electromagnetic track transmitter according to claim 3, characterized in that: A rotatable eccentric wheel is mounted on one side of the tailstock facing the cover member via an eccentric wheel screw; The cover plate component is provided with a limiting groove at a position corresponding to the eccentric wheel; When the cover plate component and the tailstock are closed, the eccentric wheel can be partially embedded in the limiting groove by rotating the eccentric wheel.

10. The multi-turn driven electromagnetic track transmitter according to claim 3, characterized in that: The transfer copper busbar includes a plurality of copper bars, and two ends of each of the copper bars are respectively connected to one of the elastic elements.

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