Strip welding silver contact device

Abstract

The utility model particularly relates to a material belt welding silver contact device which comprises a main body seat, a conveying track, an upper welding assembly, a lower welding assembly, a driving assembly, a first adjusting assembly, a second adjusting assembly and a third adjusting assembly. One end of the lower welding arm is rotationally fixed to the end, close to the outlet end of the conveying rail, of the main body base or the upper welding arm, the first adjusting assembly is used for adjusting the position of the main body base in the X direction, the second adjusting assembly is used for adjusting the position of the main body base in the Y direction, and the third adjusting assembly is used for adjusting the position of a material belt in the Y direction. Fine adjustment of the positions of the silver contacts located on the first adjusting assembly and the second adjusting assembly is achieved, fine adjustment of the positions of the material belts is achieved through the third adjusting assembly, the corresponding accuracy of the contacts and the material belts is improved, and the yield of welding production is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of contact welding, in particular to a strip welding silver contact device. Background Art

[0002] A contact refers to the junction or contact surface between two conductors through which current can pass. Since metal conductor terminals are prone to instantaneous heat and sparks at the moment of contact, the contact points are prone to oxidation and electrolysis during the multi-frequency process of use. Therefore, the contact points are enlarged and thickened, or made of polymer metal. Therefore, this contact point made of polymer metal, or the point that is enlarged and thickened with the same material is called a silver contact.

[0003] The existing welding devices lack a mechanism for fine-tuning the positions of the material strip and the contacts. In actual applications, the material strip and the contacts are prone to deviate from the corresponding welding positions, affecting the yield rate. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a strip welding silver contact device.

[0005] The technical solution adopted by the utility model is as follows: a material strip welding silver contact device, comprising a main body seat, a conveying track, an upper welding assembly, a lower welding assembly and a driving assembly, wherein the conveying track is arranged in the track mounting groove of the main body seat along the X direction and has an inlet end and an outlet end, and an upper welding arm and a lower welding arm are respectively arranged at the upper and lower ends of the main body seat, the upper welding assembly is fixed on the upper welding arm and protrudes downward at one end of the main body seat close to the outlet end of the conveying track to form an upper welding end, the lower welding assembly is fixed on the lower welding arm and protrudes upward at one end of the main body seat close to the outlet end of the conveying track to form a lower welding end,

[0006] Also includes a first adjustment component, a second adjustment component and a third adjustment component,

[0007] The upper welding arm is fixed to the upper end of the main body seat, one end of the lower welding arm is rotatably fixed to the main body seat or the end of the upper welding arm close to the exit end of the conveying track, and the lower welding arm moves relative to the main body seat under the drive of the driving assembly so that the upper welding end and the lower welding end have a welding state and a separation and loading state.

[0008] The first adjusting component is used to adjust the position of the main base in the X direction, the second adjusting component is used to adjust the position of the main base in the Y direction, and the third adjusting component is used to adjust the position of the material strip in the Y direction.

[0009] Preferably, it also includes a frame, the upper end of the upper welding arm is fixed with a guide slider extending in the X direction, the guide slider and the lower end of the frame top plate are fixed with a fixed block, the lower end of the fixed block is penetrated with a first guide groove dominated by the shape of the guide slider in the X direction, the guide slider passes through the first guide groove and is plugged into the fixed block, and the fixed block limits the movement of the guide slider in the Y direction.

[0010] The first adjustment assembly includes a first connecting block fixed to one side of the fixing block in the X direction, a first adjusting screw is passed through the first connecting block along the X direction, and the guide slider moves relative to the first guide groove along the X direction under the action of the first adjusting screw.

[0011] Preferably, a fixed transverse plate is fixed to the upper end of the fixed block, at least one first screw hole is provided on the upper end of the fixed transverse plate, a first strip hole extending along the Y direction is provided at a position of the frame top plate corresponding to the first screw hole, and the fixed transverse plate is detachably fixedly connected to the frame through a screw member;

[0012] The second adjustment component includes a second connecting block fixed to the lower end of the frame top plate and located on one side of the fixed cross plate in the Y direction. A second adjusting screw is passed through the second connecting block along the Y direction. The fixed cross plate moves relative to the frame along the Y direction under the action of the second adjusting screw.

[0013] Preferably, two groups of the second adjustment components are provided and are located on both sides of the fixed transverse plate in the Y direction.

[0014] Preferably, a material belt platform is provided at one side of the exit end of the conveying track, and the material belt is placed on the material belt platform along the Y direction. The third adjustment component includes a first positioning portion and a second positioning portion provided on the material belt platform, the first positioning portion and the second positioning portion are located on both sides of the material belt, and the first positioning portion and the second positioning portion are respectively provided with a first limiting groove and a second limiting groove at the bottom of one side close to each other, and the material belt passes through the first and second limiting grooves and is located between the first positioning portion and the second positioning portion in the X direction and the upper limit in the Y direction;

[0015] The first positioning portion and the second positioning portion are respectively provided with a second strip hole and a third strip hole extending along the X direction, and the material strip platform is correspondingly provided with a second screw hole matching the second strip hole and the third strip hole. The first positioning portion and the second positioning portion are detachably fixedly connected to the material strip platform through a screw member.

[0016] Preferably, the bottom of the first positioning portion and the bottom of the second positioning portion are provided with guide convex strips extending downwardly along the X direction, and the material strip platform is correspondingly provided with a second guide groove that is plug-fitted with the guide convex strips.

[0017] Preferably, the first positioning portion is located on a side of the material strip away from the main seat, and the material strip platform is provided with a screw hole group corresponding to the second strip hole, and the screw hole group includes at least two second screw holes distributed along the X direction.

[0018] Preferably, a silver contact limiting groove is provided on the lower welding end, and the conveying track outlet end corresponds to the position of the silver contact limiting groove on the lower welding end in the separated state, and the driving assembly drives the lower welding assembly to move relative to the main body seat to switch the upper welding end and the lower welding end between the welding state and the separated loading state and weld the silver contacts one by one to the lower end surface of the material strip.

[0019] Preferably, the lower welding assembly includes a lower welding head, a mounting groove is provided on one side of the upper end of the lower welding head close to the main body seat, an annular block is installed in the mounting groove along the X direction, a plurality of silver contact limiting grooves are provided around the annular block, and the lower welding head and the top end of the annular block form a lower welding end.

[0020] Preferably, the driving assembly includes a mounting shell seat fixed on the bottom plate of the frame and a rocker plate centrally hinged in the mounting shell seat, the lower end of the lower welding arm is connected to a pressure rod, a spring limiting portion is provided in the middle of the pressure rod, and the outer sleeve of the pressure rod is provided with a first spring with two ends limited between the bottom of the lower welding arm and the spring limiting portion.

[0021] The lower end of the pressure rod penetrates into the mounting housing to form a match with one end of the rocker plate.

[0022] A second spring is connected between the bottom of the other end of the seesaw and the bottom plate of the frame, and the top of the end is matched with the power source.

[0023] The beneficial effects of the utility model are as follows: the position of the silver contacts located thereon is finely adjusted by the first and second adjusting components, and the position of the material strip is finely adjusted by the third adjusting component, thereby improving the accuracy of the correspondence between the contacts and the material strip and improving the yield rate of welding production. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0025] Figure 1 This is an overall structural diagram of an embodiment of the utility model;

[0026] Figure 2 It is a left view of the overall structure of the embodiment of the utility model;

[0027] Figure 3 It is a rear view of the overall structure of the embodiment of the utility model;

[0028] Figure 4 It is a rear cross-sectional view of the overall structure of an embodiment of the utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the first adjustment component and the second adjustment component of the embodiment of the utility model;

[0030] Figure 6 This is a left side cross-sectional view of the first adjustment component and the second adjustment component of the embodiment of the utility model;

[0031] Figure 7 It is a front cross-sectional view of the first adjustment component and the second adjustment component of the embodiment of the utility model;

[0032] Figure 8 This is a three-dimensional structural diagram of the material belt platform and the third adjustment component of the embodiment of the utility model;

[0033] Fig. 9 This is a three-dimensional structural diagram of the material belt platform and the second positioning part of the embodiment of the utility model;

[0034] Fig.10 This is a three-dimensional structural diagram of the welding head for the implementation of the utility model;

[0035] Fig.11 This is a right view of the welding head structure for the implementation of the utility model;

[0036] In the figure, 1, main body seat; 2, upper welding arm; 3, lower welding arm; 4, frame; 5, material belt platform; 7, lower welding head; 11, track mounting groove; 21, guide slider; 31, pressure rod; 41, fixed block; 42, fixed horizontal plate; 43, first strip hole; 44, mounting shell seat; 51, first positioning part; 52, second positioning part; 53, second guide groove; 54, second screw hole; 73, mounting groove; 74, annular block; 311, first spring; 312, spring Limiting part; 313, second spring; 411, first guide groove; 412, first connecting block; 413, first adjusting screw; 412, first screw hole; 422, second connecting block; 423, second adjusting screw; 441, seesaw; 511, first limiting groove; 512, second strip hole; 513, guiding convex strip; 521, second limiting groove; 522, third strip hole; 621, upper welding end; 721, lower welding end; 7211, contact limiting groove. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0038] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0039] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0040] like Figure 2 As shown in the figure, a is the silver contact and b is the material strip.

[0041] like Figures 1 to 11 As shown in the figure, in the embodiment of the utility model, a device for welding silver contacts of a material strip comprises a main body seat 1, a conveying track, an upper welding assembly, a lower welding assembly and a driving assembly. The conveying track is arranged in the track mounting groove 11 of the main body seat 1 along the X direction and has an inlet end and an outlet end. The upper and lower ends of the main body seat 1 are respectively provided with an upper welding arm 2 and a lower welding arm 3. The upper welding assembly is fixed on the upper welding arm 2 and protrudes downward at one end of the main body seat 1 close to the outlet end of the conveying track to form an upper welding end 621. The lower welding assembly is fixed on the lower welding arm 3 and protrudes upward at one end of the main body seat 1 close to the outlet end of the conveying track to form a lower welding end 721.

[0042] Also includes a first adjustment component, a second adjustment component and a third adjustment component,

[0043] The upper welding arm 2 is fixed to the upper end of the main body seat 1, and one end of the lower welding arm 3 is rotatably fixed to the main body seat 1 or the end of the upper welding arm 2 close to the exit end of the conveying track. The lower welding arm 3 moves relative to the main body seat 1 under the drive of the driving component so that the upper welding end 621 and the lower welding end 721 have a welding state and a separation and loading state.

[0044] The first adjusting component is used to adjust the position of the main base 1 in the X direction, the second adjusting component is used to adjust the position of the main base 1 in the Y direction, and the third adjusting component is used to adjust the position of the material strip in the Y direction.

[0045] With this arrangement, since the upper welding arm is fixed to the main body seat, and one end of the lower welding arm is fixed to the main body seat or the upper welding arm, the position adjustment of the upper welding arm, the main body seat and the lower welding arm in the X and Y directions is fixedly linked, that is, the horizontal positions of the upper welding arm, the main body seat and the lower welding arm are fine-tuned as a whole by adjusting the position of the main body seat in the X and Y directions, the position of the silver contact located thereon is fine-tuned by the first and second adjusting components, and the position of the material strip is fine-tuned by the third adjusting component, thereby improving the accuracy of the correspondence between the contacts and the material strips, and improving the yield rate of welding production.

[0046] The machine frame 4 is also included. A guide slider 21 extending in the X direction is fixed to the upper end of the upper welding arm 2. A fixing block 41 is fixed to the lower end of the top plate of the frame 4. A first guide groove 411 which is controlled by the shape of the guide slider 21 is penetrated through the lower end of the fixing block 41 in the X direction. The guide slider 21 passes through the first guide groove 411 and is plugged and matched with the fixing block 41. The fixing block 41 limits the movement of the guide slider 21 in the Y direction.

[0047] The first adjustment assembly includes a first connecting block 412 fixed to one side of the fixing block 41 in the X direction. A first adjusting screw 413 is passed through the first connecting block 412 along the X direction. The guide slider 21 moves relative to the first guide groove 411 along the X direction under the action of the first adjusting screw 413.

[0048] Through this arrangement, the position of the contact in the X direction can be quickly fine-tuned. The first connecting block is an L-shaped block.

[0049] A fixed horizontal plate 42 is fixed to the upper end of the fixed block 41, and at least one first screw hole 421 is provided at the upper end of the fixed horizontal plate 42. A first strip hole 43 extending along the Y direction is provided at a position of the top plate of the frame 4 corresponding to the first screw hole 421. The fixed horizontal plate 42 is detachably fixedly connected to the frame 4 through a screw member.

[0050] The second adjustment component includes a second connecting block 422 fixed to the lower end of the top plate of the frame 4 and located on one side of the fixed cross plate 42 in the Y direction. A second adjusting screw 423 is passed through the second connecting block 422 along the Y direction. The fixed cross plate 42 moves relative to the frame 4 along the Y direction under the action of the second adjusting screw 423.

[0051] Through this arrangement, the position of the contact point in the Y direction can be quickly fine-tuned. In this embodiment, four groups of first strip holes 43 and screw holes 421 are provided and symmetrically distributed.

[0052] The second adjustment components are provided in two groups and are located on both sides of the fixed transverse plate 42 in the Y direction.

[0053] This setting further improves the flexibility of fine-tuning.

[0054] A material belt platform 5 is provided at one side of the conveyor track exit end, and the material belt is placed on the material belt platform 5 along the Y direction. The third adjustment assembly includes a first positioning portion 51 and a second positioning portion 52 provided on the material belt platform 5. The first positioning portion 51 and the second positioning portion 52 are located on both sides of the material belt. The first positioning portion 51 and the second positioning portion 52 are respectively provided with a first limiting groove 511 and a second limiting groove 521 at the bottom of one side close to each other. The material belt passes through the first and second limiting grooves and is located between the first positioning portion 51 and the second positioning portion 52 in the X direction and the upper limit of the Y direction;

[0055] The first positioning portion 51 and the second positioning portion 52 are respectively provided with a second strip hole 512 and a third strip hole 522 extending along the X direction, and the material strip platform 5 is correspondingly provided with a second screw hole 54 cooperating with the second strip hole 512 and the third strip hole 522. The first positioning portion 51 and the second positioning portion 52 are detachably fixedly connected to the material strip platform 5 through a screw member.

[0056] Through this arrangement, the position of the material strip in the X direction can be quickly fine-tuned. In this embodiment, two groups of third adjustment components are provided and distributed along the Y direction, thereby improving the stability of the material strip limit.

[0057] A guide ridge 513 extending downwardly along the X direction is disposed at the bottom of the first positioning portion 51 and the bottom of the second positioning portion 52 , and the material strip platform 5 is correspondingly provided with a second guide groove 53 that is plugged in with the guide ridge 513 .

[0058] This arrangement improves the stability of the strip position adjustment.

[0059] The first positioning portion 51 is located at a side of the material strip away from the main base 1 . The material strip platform 5 is provided with a screw hole group corresponding to the second strip hole 512 . The screw hole group includes at least two second screw holes 54 distributed along the X direction.

[0060] Through this arrangement, the applicability of the material strip positioning structure is improved, and it can be applied to material strips of various widths.

[0061] The lower welding end 721 is provided with a silver contact limiting groove 7211, and the conveying track outlet end corresponds to the position of the silver contact limiting groove 7211 on the lower welding end 721 in the separated state. The driving component drives the lower welding component to move relative to the main body seat 1 to switch the upper welding end 621 and the lower welding end 721 between the welding state and the separated loading state and weld the silver contacts one by one to the lower end surface of the material belt.

[0062] Through this arrangement, the silver contacts can be welded to the reverse side of the strip, which can meet special welding needs.

[0063] The lower welding assembly includes a lower welding head 7, and a mounting groove 73 is provided on one side of the upper end of the lower welding head 7 close to the main seat 1. An annular block 74 is installed in the mounting groove 73 along the X direction. A plurality of silver contact limiting grooves 7211 are provided around the annular block 74. The top ends of the lower welding head 7 and the annular block 74 form a lower welding end 721.

[0064] Since the silver contact limiting groove has been worn out during the welding process, through this arrangement, when the silver contact limiting groove located at the lower welding end is worn out, the silver contact limiting groove located at other positions of the annular block can be rotated to the position of the lower welding end to form a substitute, thereby improving the service life of the structure.

[0065] The driving assembly includes a mounting housing 44 fixed on the bottom plate of the frame 4 and a rocker 441 centrally hinged in the mounting housing 44. The lower end of the lower welding arm 3 is connected to a pressure rod 31, and a spring limiting portion 312 is provided in the middle of the pressure rod 31. The outer sleeve of the pressure rod is provided with a first spring 311 with two ends limited between the bottom of the lower welding arm 3 and the spring limiting portion 312.

[0066] The lower end of the pressure rod 31 penetrates into the mounting housing 44 and forms a fit with one end of the rocker plate 441.

[0067] A second spring 313 is connected between the bottom of the other end of the seesaw 441 and the bottom plate of the frame 4, and the top of the end is matched with the power source.

[0068] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A device for welding silver contacts of a material strip, comprising a main body seat (1), a conveying track, an upper welding assembly, a lower welding assembly and a driving assembly, wherein the conveying track is arranged in a track mounting groove (11) of the main body seat (1) along the X direction and has an inlet end and an outlet end, an upper welding arm (2) and a lower welding arm (3) are respectively arranged at the upper and lower ends of the main body seat (1), the upper welding assembly is fixed on the upper welding arm (2) and protrudes downward at one end of the main body seat (1) close to the outlet end of the conveying track to form an upper welding end (621), the lower welding assembly is fixed on the lower welding arm (3) and protrudes upward at one end of the main body seat (1) close to the outlet end of the conveying track to form a lower welding end (721), characterized in that: Also includes a first adjustment component, a second adjustment component and a third adjustment component, The upper welding arm (2) is fixed to the upper end of the main body seat (1); one end of the lower welding arm (3) is rotatably fixed to the main body seat (1) or to an end of the upper welding arm (2) close to the exit end of the conveying track; the lower welding arm (3) is driven by the driving component to move relative to the main body seat (1) so that the upper welding end (621) and the lower welding end (721) have a welding state and a separation and loading state. The first adjustment component is used to adjust the position of the main base (1) in the X direction, the second adjustment component is used to adjust the position of the main base (1) in the Y direction, and the third adjustment component is used to adjust the position of the material strip in the Y direction.

2. A strip welding silver contact device according to claim 1, characterized in that: It also comprises a frame (4), the upper end of the upper welding arm (2) is fixed with a guide slider (21) extending in the X direction, the guide slider (21) and the lower end of the frame (4) top plate are fixed with a fixed block (41), the lower end of the fixed block (41) is penetrated with a first guide groove (411) in the X direction and is shaped like the guide slider (21), the guide slider (21) passes through the first guide groove (411) and is plugged into the fixed block (41), and the fixed block (41) limits the movement of the guide slider (21) in the Y direction, The first adjustment component comprises a first connecting block (412) fixed to one side of the fixed block (41) in the X direction, a first adjusting screw (413) is passed through the first connecting block (412) along the X direction, and the guide slider (21) moves relative to the first guide groove (411) along the X direction under the action of the first adjusting screw (413).

3. A strip welding silver contact device according to claim 2, characterized in that: A fixed transverse plate (42) is fixed to the upper end of the fixed block (41), at least one first screw hole (421) is provided at the upper end of the fixed transverse plate (42), a first strip hole (43) extending along the Y direction is provided at a position of the top plate of the frame (4) corresponding to the first screw hole (421), and the fixed transverse plate (42) is detachably fixedly connected to the frame (4) through a screw member; The second adjustment component comprises a second connecting block (422) fixed to the lower end of the top plate of the frame (4) and located on one side of the fixed cross plate (42) in the Y direction, a second adjusting screw (423) passing through the second connecting block (422) along the Y direction, and the fixed cross plate (42) moves relative to the frame (4) in the Y direction under the action of the second adjusting screw (423).

4. The strip welding silver contact device according to claim 3, characterized in that: The second adjustment components are provided in two groups and are located on both sides of the fixed transverse plate (42) in the Y direction.

5. The strip welding silver contact device according to claim 1, characterized in that: A material belt platform (5) is arranged at one side of the exit end of the conveying track, and the material belt is placed on the material belt platform (5) along the Y direction. The third adjustment component comprises a first positioning portion (51) and a second positioning portion (52) arranged on the material belt platform (5), the first positioning portion (51) and the second positioning portion (52) are located on both sides of the material belt, and the first positioning portion (51) and the second positioning portion (52) are respectively provided with a first limiting groove (511) and a second limiting groove (521) at the bottom of one side close to each other, and the material belt passes through the first and second limiting grooves and is located between the first positioning portion (51) and the second positioning portion (52) in the X direction and the upper limit of the Y direction; The first positioning portion (51) and the second positioning portion (52) are respectively provided with a second strip hole (512) and a third strip hole (522) extending along the X direction, and the material strip platform (5) is correspondingly provided with a second screw hole (54) cooperating with the second strip hole (512) and the third strip hole (522), and the first positioning portion (51) and the second positioning portion (52) are detachably fixedly connected to the material strip platform (5) through a screw member.

6. The strip welding silver contact device according to claim 5, characterized in that: The bottom of the first positioning portion (51) and the bottom of the second positioning portion (52) are provided with guide convex strips (513) extending downwardly along the X direction, and the material strip platform (5) is correspondingly provided with a second guide groove (53) that is plugged in and matched with the guide convex strips (513).

7. The strip welding silver contact device according to claim 5, characterized in that: The first positioning portion (51) is located on a side of the material strip away from the main seat (1), and the material strip platform (5) is provided with a screw hole group corresponding to the second strip hole (512), and the screw hole group includes at least two second screw holes (54) distributed along the X direction.

8. The strip welding silver contact device according to claim 1, characterized in that: The lower welding end (721) is provided with a silver contact limiting groove (7211), the conveying track outlet end corresponds to the position of the silver contact limiting groove (7211) on the lower welding end (721) in the separated state, and the driving component drives the lower welding component to move relative to the main body seat (1) so that the upper welding end (621) and the lower welding end (721) are switched between the welding state and the separated loading state, and the silver contacts are welded one by one to the lower end surface of the material belt.

9. The strip welding silver contact device according to claim 8, characterized in that: The lower welding assembly comprises a lower welding head (7), a mounting groove (73) is arranged on one side of the upper end of the lower welding head (7) close to the main body seat (1), an annular block (74) is installed in the mounting groove (73) along the X direction, a plurality of silver contact limiting grooves (7211) are arranged around the annular block (74), and the top ends of the lower welding head (7) and the annular block (74) form a lower welding end (721).

10. The strip welding silver contact device according to claim 1, characterized in that: The driving assembly comprises a mounting housing (44) fixed on a bottom plate of a frame (4) and a seesaw (441) centrally hinged in the mounting housing (44); a pressure rod (31) is connected to the lower end of the lower welding arm (3); a spring limiting portion (312) is provided in the middle of the pressure rod (31); a first spring (311) is provided on the outer sleeve of the pressure rod with two ends limited between the bottom of the lower welding arm (3) and the spring limiting portion (312); The lower end of the pressure rod (31) penetrates into the mounting housing (44) and forms a fit with one end of the rocker plate (441). A second spring (313) is connected between the bottom of the other end of the seesaw (441) and the bottom plate of the frame (4), and the top of the end is matched with the power source.

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