Low-cost free combination lamp string

Abstract

A lampshade is movably installed on the upper portion of a lamp shell, a light-emitting assembly is fixedly installed in the lamp shell, a clamping base is installed on the lower portion of a lamp holder in a buckled mode, a power line is clamped between the lamp holder and the clamping base, welding parts are arranged at the upper ends of two puncture conducting strips, and puncture parts are arranged at the lower ends of the two puncture conducting strips. The welding parts of the two puncture conducting strips are welded and fixed to the two wiring ends of the light-emitting assembly respectively, and the puncture parts of the two puncture conducting strips pierce the insulation skin of the power line and are electrically connected with the wire core of the power line. The puncture conducting strip is directly welded and fixed to the light-emitting assembly, the puncture part abuts against the partition plate, and therefore the puncture conducting strip, the light-emitting assembly and the lamp shell are connected into a whole, the fixing mode is simple and reliable, cost is reduced, poor contact is avoided, and reliability and stability are improved. The light-emitting assembly is fixed in the lamp shell, personalized customization can be completed only by replacing lampshades of different colors and shapes, the customization cost is low, and the production efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of lamp strings, in particular to a low-cost freely combinable lamp string. Background Art

[0002] A lamp string is a decorative lamp that realizes multi-point lighting by connecting multiple bulbs in series on a wire. With the increasing demand for customization, people often need to customize the distance between adjacent bulbs, as well as the color and shape of the bulbs. Therefore, freely combinable lamp strings have emerged on the market. Metal terminals with piercing functions are provided on the lamp holders. According to requirements, the lamp holders are installed on the wire, and then bulbs of the required color and shape are installed on the lamp holders. Since the light-emitting body is inside the bulb, the cost of replacing the bulb is high. Moreover, electrical connection needs to be made between the lamp holder and the bulb, resulting in a complex structure and high production cost. In addition, the metal terminals are first connected to the conductive sheets on the lamp holder by abutting, and then connected to the bulb through the conductive sheets. This not only has a complex structure and high cost, but also is prone to poor contact. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0003] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a low-cost freely combinable lamp string, which simplifies the structure, reduces the production cost, improves the customization convenience, reduces the customization cost, and improves the reliability and stability.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is: a low-cost freely combinable lamp string, which includes a power cord and a plurality of bulbs installed at intervals on the power cord. The bulb includes a lampshade, a light-emitting component, a lamp housing, a lamp holder and two piercing conductive sheets. The lampshade is movably installed on the upper part of the lamp housing, the light-emitting component is fixedly installed inside the lamp housing, the lamp holder is snap-fitted on the lower part of the lamp base, the power cord is clamped between the lamp base and the lamp holder. The upper ends of the two piercing conductive sheets are provided with welding parts, and the lower ends are provided with piercing parts. The welding parts of the two piercing conductive sheets are respectively welded and fixed to the two wiring ends of the light-emitting component, and the piercing parts of the two piercing conductive sheets pierce the insulating skin of the power cord and are electrically connected to the wire core of the power cord.

[0005] In a further technical solution, the light-emitting component includes a PCB board and at least one LED light-emitting body. The LED light-emitting body is arranged on the upper end surface of the PCB board. Wiring holes penetrating the PCB board are respectively opened on both sides of the PCB board. The welding parts of the two piercing conductive sheets respectively pass through the two wiring holes and are welded and fixed to the PCB board.

[0006] In a further technical solution, an upper mounting cavity and a lower connection cavity are provided inside the lamp housing. The upper mounting cavity is located above the lower connection cavity. A partition is provided between the upper mounting cavity and the lower connection cavity. Two card interfaces vertically penetrating the partition are formed on the partition. Two connecting card plates are provided on the upper end surface of the card seat. Clasps are provided at the upper ends of the two connecting card plates. The two connecting card plates respectively pass through the two card interfaces. The two clasps are respectively in snap-fit with the upper end surface of the partition. The upper part of the puncturing portion is in abutting fit with the lower end surface of the partition.

[0007] In a further technical solution, a fixing seat is provided in the upper mounting cavity. The lower part of the fixing seat is formed at the center of the upper end surface of the partition. The PCB board is fixedly installed on the mounting seat. Two conductive through holes penetrating the mounting seat and the partition are formed on the mounting seat. The two puncturing conductive sheets are respectively inserted into the two conductive through holes and the puncturing portions extend into the lower connection cavity.

[0008] In a further technical solution, two wire grooves opening downward are respectively formed on two opposite sides of the lower part of the lamp housing. Semi-circular upper wire holes are respectively formed on the upper end surfaces of the two wire grooves. The power cord is arranged in the wire grooves and is pressed in the upper wire holes.

[0009] In a further technical solution, a pressing seat is provided on the upper end surface of the card seat. A semi-circular lower pressing groove is formed on the upper end surface of the pressing seat. The pressing seat is clamped in the two wire grooves. A wire passing channel is formed between the lower pressing groove and the corresponding upper wire hole. The power cord respectively passes through the wire passing channels.

[0010] In a further technical solution, the card seat is inserted into the lower connection cavity. The outer side surface of the card seat is in abutting fit with the inner wall of the lower connection cavity. Both ends of the pressing seat respectively protrude from the outer side surface of the card seat and extend to the outer side surface of the lamp housing.

[0011] In a further technical solution, the card seat is further provided with an elastic hook. The elastic hook includes a horizontally arranged fixing portion and a bent elastic portion. A hook avoiding groove opening downward is formed on the lower edge of the lamp housing. The fixing portion is embedded in the hook avoiding groove. One end of the fixing portion is integrally formed with the outer side surface of the card seat and the other end of the fixing portion is integrally formed with the lower end portion of the elastic hook. The upper end portion of the elastic hook extends to the upper part of the lamp housing.

[0012] In a further technical solution, internal threads are provided on the inner wall of the upper mounting cavity. External threads are provided on the lower part of the lamp cover. The lamp cover is in threaded connection with the lamp housing. A sealing rubber ring or a sealing glue layer is further provided between the lamp cover and the lamp seat.

[0013] In a further technical solution, connection male heads and connection female heads are respectively provided at both ends of the power cord. Waterproof sleeves are respectively sleeved on the outer parts of the connection male heads or connection female heads. External threads are provided on the outer parts of the corresponding connection female heads or connection male heads. The waterproof sleeves are in threaded connection with the adjacent connection female heads or connection male heads;

[0014] The power cord includes two wires arranged side by side. The upper part of the puncture portion abuts and cooperates with the lower end face of the partition plate. One side of the lower part of the puncture portion is provided with a pressing piece, and the other side is provided with a puncture piece. The two puncture conductive pieces are symmetrically arranged. The pressing piece of the first puncture conductive piece abuts and cooperates with the first wire. The puncture piece of the first puncture conductive piece pierces the insulating piece of the second wire and is electrically connected to the wire core of the second wire. The pressing piece of the second puncture conductive piece abuts and cooperates with the second wire. The puncture piece of the second puncture conductive piece pierces the insulating piece of the first wire and is electrically connected to the wire core of the first wire.

[0015] After adopting the above structure, the advantages of the present utility model compared with the prior art are as follows: The puncture conductive piece is directly welded and fixed to the light-emitting component, without the need for a conductive piece transfer, which simplifies the structure, reduces costs, avoids poor contact, and improves reliability and stability; The light-emitting component is fixed in the lamp housing, and personalized customization can be completed only by replacing lamp covers of different colors and shapes. The customization cost is low and the production efficiency is high; The card holder is embedded in the lamp housing, thereby shortening the height of the bulb and reducing the volume; The bulb is fixed by the elastic hook cooperating with the lamp housing, without the need for additional fixing tools, which is convenient to use; The welding part of the puncture conductive piece is welded to the light-emitting component, and the puncture part of the puncture conductive piece abuts against the partition plate, thereby connecting the puncture conductive piece, the light-emitting component and the lamp housing into one body, and the fixing method is simple and reliable. Description of the Drawings

[0016] The present utility model will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of the present utility model;

[0018] Figure 2 is the Figure 1 enlarged view of part A of the present utility model;

[0019] Figure 3 is a cross-sectional view of the present utility model;

[0020] Figure 4 is an exploded view of the bulb of the present utility model;

[0021] Figure 5 is a schematic structural diagram of the puncture conductive piece of the present utility model.

[0022] In the figure:

[0023] 11 Power cord, 111 Wire, 12 Male connecting head, 13 Female connecting head, 14 Waterproof sleeve;

[0024] 2 Lamp cover;

[0025] 3 Light-emitting component, 31 PCB board, 311 Wiring hole, 32 LED light-emitting body;

[0026] 4 Lamp housing, 41 Upper mounting cavity, 42 Lower connection cavity, 43 Partition board, 431 Card interface, 432 Fixed seat, 433 Conductive perforation, 44 Wire slot, 45 Upper wire hole, 46 Hook avoidance groove;

[0027] 5 Card holder, 51 Connecting card board, 511 Buckle, 52 Lower pressing seat, 521 Lower pressing groove, 53 Elastic hook, 531 Fixed part, 532 Elastic part;

[0028] 6 Piercing conductive sheet, 61 Welding part, 62 Piercing part, 621 Pressing piece, 622 Piercing piece. Specific embodiments

[0029] The following are only the preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly.

[0030] A low-cost freely combinable lamp string, as Figures 1 to 5 shown, includes a power cord 11 and a plurality of bulbs spacedly installed on the power cord 11. The bulb includes a lampshade 2, a light-emitting component 3, a lamp housing 4, a card holder 5 and two piercing conductive sheets 6. The lampshade 2 is movably installed on the upper part of the lamp housing 4, the light-emitting component 3 is fixedly installed inside the lamp housing 4, the card holder 5 is buckled and installed on the lower part of the lamp socket, the power cord 11 is clamped between the lamp socket and the card holder 5. The upper ends of the two piercing conductive sheets 6 are provided with welding parts 61, and the lower ends are provided with piercing parts 62. The welding parts 61 of the two piercing conductive sheets 6 are respectively welded and fixed to the two wiring ends of the light-emitting component 3. The piercing parts 62 of the two piercing conductive sheets 6 pierce the insulating skin of the power cord 11 and are electrically connected to the wire core of the power cord 11. The traditional freely combinable lamp string connects the lamp socket to the power cord 11, and then installs the bulb with the light-emitting component 3 inside on the lamp socket. The structure is complex and the volume is large. When personalized customization is required, the whole bulb needs to be replaced, the customization cost is high, and the production efficiency is low. However, the piercing conductive sheet 6 of the present invention is directly welded and fixed to the light-emitting component 3, without the need for a conductive sheet transfer, which simplifies the structure, reduces the cost, avoids poor contact, and improves the reliability and stability; the light-emitting component 3 is fixed in the lamp housing 4, and personalized customization can be completed only by replacing the lampshades 2 of different colors and shapes, with low customization cost and high production efficiency.

[0031] Specifically, the light-emitting component 3 includes a PCB board 31 and at least one LED light-emitting body 32. The LED light-emitting body 32 is arranged on the upper end face of the PCB board 31. Through holes 311 penetrating the PCB board 31 are respectively opened on both sides of the PCB board 31. The welding parts 61 of the two piercing conductive sheets 6 respectively pass through the two through holes 311 and are welded and fixed to the PCB board 31. The light-emitting component 3 emits light through the LED light-emitting body 32. The LED has excellent performances such as long service life, low cost and low energy consumption.

[0032] Specifically, an upper mounting cavity 41 and a lower connection cavity 42 are provided inside the lamp housing 4. The upper mounting cavity 41 is located above the lower connection cavity 42. A partition plate 43 is provided between the upper mounting cavity 41 and the lower connection cavity 42. Two card interfaces 431 vertically penetrating the partition plate 43 are formed on the partition plate 43. Two connection card plates 51 are provided on the upper end surface of the card seat 5. Buckles 511 are provided at the upper ends of the two connection card plates 51. The two connection card plates 51 are respectively inserted into the two card interfaces 431, and the two buckles 511 are respectively in snap-fit with the upper end surface of the partition plate 43. The upper part of the puncture portion 62 is in abutting fit with the lower end surface of the partition plate 43. The card seat 5 is snap-connected to the lamp housing 4 through the two connection card plates 51. When installing the light bulb, it is only necessary to clamp the power cord 11 between the card seat 5 and the lamp housing 4, and then pass the two connection card plates 51 through the card interfaces 431 so that the buckles 511 are snap-connected to the partition plate 43, thus completing the installation, simplifying the installation steps and eliminating the need for tools for installation.

[0033] Specifically, a fixing seat 432 is provided in the upper mounting cavity 41. The lower part of the fixing seat 432 is formed at the center of the upper end surface of the partition plate 43. The PCB board 31 is fixedly installed on the mounting seat. The mounting seat is provided with two conductive through holes 433 penetrating the mounting seat and the partition plate 43. The two puncture conductive sheets 6 are respectively inserted into the two conductive through holes 433 and the puncture portion 62 extends into the lower connection cavity 42. The PCB board 31 is supported and fixed by the fixing seat 432, so that there is a gap between the PCB board 31 and the partition plate 43, which helps the PCB board 31 to dissipate heat. During installation, first insert the two puncture conductive sheets 6 from the lower connection cavity 42 into the conductive through holes 433, and then weld the puncture conductive sheets 6 to the PCB board 31. The PCB board 31 is fixed on the fixing seat 432 through the puncture conductive sheets 6, thus simplifying the structure, simplifying the production process and reducing the cost.

[0034] Specifically, two wire grooves 44 opening downward are respectively formed on two opposite sides of the lower part of the lamp housing 4. Semi-circular upper wire holes 45 are respectively formed on the upper end surfaces of the two wire grooves 44. The power cord 11 is inserted into the wire grooves 44 and pressed in the upper wire holes 45. The power cord 11 is accommodated by the wire grooves 44 and the power cord 11 is brought close to the PCB board 31 to shorten the length of the puncture conductive sheet 6. The semi-circular upper wire holes 45 fit the outer contour of the power cord 11, thereby increasing the contact area between the power cord 11 and the lamp housing 4 and improving the connection tightness with the power cord 11.

[0035] Specifically, a pressing seat 52 is provided on the upper end surface of the card seat 5. A semi-circular lower pressing groove 521 is formed on the upper end surface of the pressing seat 52. The pressing seat 52 is clamped in the two wire threading grooves 44. A wire threading channel is formed between the lower pressing groove 521 and the corresponding upper wire threading hole 45 respectively. The power supply wires 11 are respectively threaded through the wire threading channels. The power supply wires 11 are pressed tightly in the wire threading grooves 44 by the pressing seat 52, and the contact area between the power supply wires 11 and the pressing seat 52 is increased through the lower pressing groove 521, thereby further improving the connection tightness with the power supply wires 11.

[0036] Specifically, the card seat 5 is inserted into the lower connection cavity 42. The outer side surface of the card seat 5 is in abutting fit with the inner wall of the lower connection cavity 42. Both ends of the pressing seat 52 protrude from the outer side surface of the card seat 5 and extend to the outer side surface of the lamp housing 4. The card seat 5 is embedded in the lamp housing 4, thereby shortening the height of the bulb and reducing the volume.

[0037] Specifically, the card seat 5 is further provided with an elastic hook 53. The elastic hook 53 includes a horizontally arranged fixing part 531 and a bent elastic part 532. A hook avoidance groove 46 with a downward opening is provided on the lower edge of the lamp housing 4. The fixing part 531 is embedded in the hook avoidance groove 46. One end of the fixing part 531 is integrally formed with the outer side surface of the card seat 5, the other end of the fixing part 531 is integrally formed with the lower end part of the elastic hook 53, and the upper end part of the elastic hook 53 extends to the upper part of the lamp housing 4. The elastic hook 53 is avoided by the hook avoidance groove 46 to prevent the elastic hook 53 from protruding downward. The elastic hook 53 cooperates with the lamp housing 4 to fix the bulb, and no additional fixing tool is required, which is convenient to use.

[0038] Specifically, the inner wall of the upper mounting cavity 41 is provided with internal threads, and the lower part of the lamp cover 2 is provided with external threads. The lamp cover 2 is threadedly connected to the lamp housing 4. A sealing rubber ring or a sealing glue layer is further provided between the lamp cover 2 and the lamp base. The threaded connection between the lamp cover 2 and the lamp housing 4 facilitates the replacement of the lamp cover 2, which is more convenient for customization. The sealing performance between the lamp cover 2 and the lamp housing 4 is improved through the sealing rubber ring or the sealing glue layer, and the waterproof performance is improved. The use of a sealing rubber ring enables the lamp cover 2 to be replaced quickly, while the use of a sealing glue layer can further improve the sealing performance and increase the connection strength between the lamp cover 2 and the lamp housing 4, improving the reliability and stability. The sealing glue layer is formed by curing the sealing glue.

[0039] Specifically, connection male heads 12 and connection female heads 13 are respectively arranged at both ends of the power cord 11. Waterproof sleeves 14 are respectively sleeved on the outer parts of the connection male heads 12 or the connection female heads 13. External threads are provided on the exteriors of the corresponding connection female heads 13 or the connection male heads 12. The waterproof sleeves 14 are threadedly connected to the adjacent connection female heads 13 or the connection male heads 12. The power cord 11 includes two wires 111 arranged side by side. The upper part of the piercing portion 62 abuts and cooperates with the lower end surface of the partition plate 43. A pressing piece 621 is arranged on one side of the lower part of the piercing portion 62, and a piercing piece 622 is arranged on the other side. Two piercing conductive pieces 6 are symmetrically arranged. The pressing piece 621 of the first piercing conductive piece 6 abuts and cooperates with the first wire 111. The piercing piece 622 of the first piercing conductive piece 6 pierces through the insulating piece of the second wire 111 and is electrically connected to the wire core of the second wire 111. The pressing piece 621 of the second piercing conductive piece abuts and cooperates with the second wire 111. The piercing piece 622 of the second piercing conductive piece 6 pierces through the insulating piece of the first wire 111 and is electrically connected to the wire core of the first wire 111. The piercing portion 62 is larger than the conductive through hole 433, so that the piercing portion 62 abuts against the lower end surface of the partition plate 43, thereby connecting the piercing conductive piece 6, the PCB board 31 and the lamp housing 4 into one body. The structure is simple and the cost is low. When the piercing conductive piece 6 pierces through the wire 111, the piercing conductive piece 6 is pressed by the partition plate 43 to improve the piercing force of the piercing conductive piece 6 and prevent the piercing conductive piece 6 from shifting. One wire 111 is a live wire and the other wire 111 is a neutral wire. Electrical connection is achieved by respectively piercing through the two wires 111 with the two piercing conductive pieces 6. When carrying out personalized customization, multiple freely combinable lamp strings can be connected in series through the connection male heads 12 and the connection female heads 13, thereby increasing the length. The waterproof sleeves 14 are used to improve the connection tightness between the connection male heads 12 and the connection female heads 13, improve the reliability and stability, and can improve the waterproof property.

[0040] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A low-cost freely combinable lamp string, comprising a power cord (11) and a plurality of bulbs spacedly installed on the power cord (11), characterized in that: The bulb includes a lamp shade (2), a light-emitting component (3), a lamp housing (4), a socket (5), and two puncture conductive sheets (6). The lamp shade (2) is movably mounted on the upper part of the lamp housing (4). The light-emitting component (3) is fixedly mounted inside the lamp housing (4). The socket (5) is snap-fitted to the lower part of the lamp base. The power cord (11) is clamped between the lamp base and the socket (5). The upper ends of the two puncture conductive sheets (6) are provided with welding parts (61), and the lower ends are provided with puncture parts (62). The welding parts (61) of the two puncture conductive sheets (6) are respectively welded and fixed to the two wiring terminals of the light-emitting component (3). The puncture parts (62) of the two puncture conductive sheets (6) pierce the insulating skin of the power cord (11) and are electrically connected to the wire core of the power cord (11).

2. The low-cost freely combinable lamp string according to claim 1, characterized in that: The light-emitting component (3) includes a PCB board (31) and at least one LED light-emitting body (32). The LED light-emitting body (32) is arranged on the upper end face of the PCB board (31). Wiring holes (311) penetrating through the PCB board (31) are respectively formed on both sides of the PCB board (31). The welding parts (61) of the two puncture conductive sheets (6) respectively pass through the two wiring holes (311) and are welded and fixed to the PCB board (31).

3. The low-cost freely combinable lamp string according to claim 2, wherein: An upper mounting cavity (41) and a lower connection cavity (42) are arranged inside the lamp housing (4). The upper mounting cavity (41) is located above the lower connection cavity (42). A partition (43) is arranged between the upper mounting cavity (41) and the lower connection cavity (42). Two card interfaces (431) vertically penetrating the partition (43) are formed on the partition (43). Two connection card boards (51) are arranged on the upper end face of the socket (5). Clasps (511) are arranged at the upper ends of the two connection card boards (51). The two connection card boards (51) respectively pass through the two card interfaces (431). The two clasps (511) are respectively in snap-fit with the upper end face of the partition (43). The upper part of the puncture part (62) is in abutting fit with the lower end face of the partition (43).

4. A low-cost freely combinable lamp string according to claim 3, characterized in that: The upper mounting cavity (41) is provided with a fixing seat (432). The lower part of the fixing seat (432) is formed at the center of the upper end face of the partition (43). The PCB board (31) is fixedly mounted on the mounting seat. Conductive through holes (433) penetrating through the mounting seat and the partition (43) are formed on the mounting seat. The two puncture conductive sheets (6) are respectively inserted into the two conductive through holes (433), and the puncture part (62) extends into the lower connection cavity (42).

5. The low-cost freely combinable lamp string according to claim 3, wherein: Two wire grooves (44) with openings facing downwards are respectively formed on two opposite sides of the lower part of the lamp housing (4). Semi-circular upper wire holes (45) are respectively formed on the upper end faces of the two wire grooves (44). The power cord (11) is arranged in the wire grooves (44) and is pressed in the upper wire holes (45).

6. The low-cost freely combinable lamp string according to claim 5, characterized in that: The upper end surface of the card seat (5) is provided with a pressing seat (52). A semi-circular lower pressing groove (521) is formed on the upper end surface of the pressing seat (52). The pressing seat (52) is clamped in the two wire passing grooves (44). A wire passing channel is formed between the lower pressing groove (521) and the corresponding upper wire passing hole (45). The power supply wires (11) are respectively arranged in the wire passing channels.

7. The low-cost freely combinable lamp string according to claim 6, characterized in that: The card seat (5) is inserted into the lower connection cavity (42). The outer side surface of the card seat (5) is in abutting fit with the inner wall of the lower connection cavity (42). Both ends of the pressing seat (52) respectively protrude from the outer side surface of the card seat (5) and extend to the outer side surface of the lamp housing (4).

8. A low-cost freely combinable lamp string according to claim 7, characterized in that: The card seat (5) is further provided with an elastic hook (53). The elastic hook (53) includes a horizontally arranged fixing part (531) and a bent elastic part (532). A hook avoiding groove (46) with a downward opening is formed on the lower edge of the lamp housing (4). The fixing part (531) is embedded in the hook avoiding groove (46). One end of the fixing part (531) is integrally formed with the outer side surface of the card seat (5), and the other end of the fixing part (531) is integrally formed with the lower end part of the elastic hook (53). The upper end part of the elastic hook (53) extends to the upper part of the lamp housing (4).

9. A low-cost freely combinable lamp string according to claim 3, characterized in that: The inner wall of the upper installation cavity (41) is provided with internal threads. The lower part of the lamp cover (2) is provided with external threads. The lamp cover (2) is in threaded connection with the lamp housing (4). A sealing rubber ring or a sealing glue layer is further arranged between the lamp cover (2) and the lamp base.

10. A low-cost freely combinable lamp string according to claim 3, characterized in that: Both ends of the power supply wire (11) are respectively provided with a connecting male head (12) and a connecting female head (13). Waterproof sleeves (14) are respectively sleeved on the outer parts of the connecting male head (12) or the connecting female head (13). External threads are respectively arranged on the outer parts of the corresponding connecting female head (13) or the connecting male head (12). The waterproof sleeves (14) are in threaded connection with the adjacent connecting female head (13) or the connecting male head (12). The power supply wire (11) includes two wires (111) arranged side by side. A pressing piece (621) is arranged on one side of the lower part of the piercing part (62), and a piercing piece (622) is arranged on the other side. The two piercing conductive pieces (6) are symmetrically arranged. The pressing piece (621) of the first piercing conductive piece (6) is in pressing fit with the first wire (111). The piercing piece (622) of the first piercing conductive piece (6) pierces through the insulating piece of the second wire (111) and is electrically connected to the wire core of the second wire (111). The pressing piece (621) of the second piercing conductive piece is in pressing fit with the second wire (111). The piercing piece (622) of the second piercing conductive piece (6) pierces through the insulating piece of the first wire (111) and is electrically connected to the wire core of the first wire (111).

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