Combined bulb structure

Abstract

The utility model discloses a combined bulb structure, which relates to the technical field of lamps and comprises a bulb base, a bulb top cover arranged at the top end of the bulb base, mounting grooves arranged on two sides of the bulb base, clamping blocks arranged at the top ends of the mounting grooves and matched with the bulb top cover, and an annular light source plate arranged at the top end of the inner side of the bulb base. A power source is arranged in the middle of the bottom end of the annular light source plate, a plurality of power spring piece assemblies are arranged on the outer side of the top of the annular light source plate, and a circular lamp plate is arranged at the top end of the annular light source plate. The combined LED bulb is scientific and novel in structure, modular assembly of the bulb can be achieved through the combined design, the bulb base, the annular light source plate, the circular lamp panel and the bulb top cover are ingeniously matched, the product structure is simplified, the assembly efficiency and maintenance convenience are greatly improved, and different illumination requirements can be flexibly met.

Description

TECHNICAL FIELD

[0001] The utility model relates to lamp technical field, concretely related to a combined bulb structure. BACKGROUND

[0002] With the rapid development of lighting technology, LED bulbs have become the mainstream product of the lighting market due to their high efficiency, long service life, good light quality and other advantages. Modern bulbs not only need to meet the basic lighting needs, but also need to consider factors such as installation convenience, maintenance simplicity, light adjustment ability, and compatibility with smart home systems. Especially in today's growing demand for personalized lighting, modular design and customizability of bulbs are becoming increasingly important, which is driving the development of bulb technology towards greater flexibility, intelligence and personalization.

[0003] For example, Chinese patent CN219674146U discloses a combined light structure, which includes a lamp holder, a lamp holder and a bulb. The bulb is fixedly installed at the bottom of the lamp holder, the top of the lamp holder is provided with a cylinder, and the top of the cylinder is fixedly connected with a fixed block. The top of the lamp holder is fixedly connected with a lock tooth on both sides, and the bottom of the lamp holder is provided with a lock hook. It can conveniently and quickly disassemble and assemble the lamp. However, the above-mentioned light structure has the following disadvantages in the process of specific application: the light structure only uses a single bulb, which lacks effective control of light distribution, which may lead to uneven lighting effect and easy generation of glare, and cannot meet the diversified demand for lighting quality in different scenes. Secondly, the light structure lacks a wire clamping assembly, which may cause unstable connection of the internal wires of the bulb in the case of long-term use or frequent disassembly and assembly of the bulb, increasing the risk of bulb failure and poor practicability.

[0004] At present, there is no effective solution to the problems in the related art. INVENTION CONTENTS

[0005] In view of the problems in the related art, the utility model provides a combined bulb structure to overcome the above-mentioned technical problems existing in the prior art.

[0006] Therefore, the utility model adopts the specific technical scheme as follows:

[0007] A combined bulb structure includes a bulb base, a bulb top cover is arranged at the top end of the bulb base, installation grooves are arranged on both sides of the bulb base, clamping blocks matched with the bulb top cover are arranged at the top end of the installation grooves, a ring-shaped light source plate is arranged at the inner top end of the bulb base, a power supply is arranged at the bottom end of the ring-shaped light source plate, a plurality of power spring sheet assemblies are arranged at the top outer side of the ring-shaped light source plate, and a circular lamp plate is arranged at the top end of the ring-shaped light source plate.

[0008] Optionally, in order to realize the increase of the user's operation convenience and anti-skid effect when installing or dismounting the bulb top cover, the bulb top cover comprises a hemispherical cover body arranged at the top end of the bulb base, a plurality of first anti-skid blind spots in double-row circumferential arrangement are arranged on one side of the hemispherical cover body, a first annular mounting edge is arranged at the bottom end of the hemispherical cover body, first sealing arc-shaped strips are arranged at the bottom of the two sides of the first annular mounting edge, first square clamping interfaces matched with the clamping blocks are arranged on the two sides of the first annular mounting edge, the first anti-skid blind spots are in circular dot-shaped protruding structure, and the first anti-skid blind spots in the top row are staggered with the first anti-skid blind spots in the bottom row.

[0009] Optionally, in order to realize the improvement of the operation performance and light illumination effect of the bulb top cover, the bulb top cover comprises a circular cover body, a circular illumination platform is arranged at the top end of the circular cover body, a plurality of second anti-skid blind spots in double-row circumferential arrangement are arranged on one side of the top end of the circular cover body, an annular diffusion grating is arranged on the outer side of the circular cover body, a second annular mounting edge is arranged at the bottom end of the annular diffusion grating, second sealing arc-shaped strips are arranged at the bottom of the two sides of the second annular mounting edge, second square clamping interfaces matched with the clamping blocks are arranged on the two sides of the second annular mounting edge, the second anti-skid blind spots are in circular dot-shaped protruding structure, and the second anti-skid blind spots in the top row are staggered with the second anti-skid blind spots in the bottom row.

[0010] Optionally, in order to realize the reliable connection of the power supply and the light source, a plurality of cylindrical metal contacts matched with the power spring sheet assembly are arranged at the top end of the annular light source plate, wire holes are arranged in the middle of the cylindrical metal contacts, and wire outlet holes are arranged on one side of the cylindrical metal contacts and penetrate the annular light source plate.

[0011] Optionally, in order to realize the firm fixation of the power supply wire between the power supply and the circular lamp plate, the power spring sheet assembly comprises a rectangular mounting sheet arranged at the top of the annular light source plate, a circular through hole matched with the cylindrical metal contact is arranged in the middle of the rectangular mounting sheet, an L-shaped connecting sheet is arranged at one end of the rectangular mounting sheet, elastic clamping sheets are symmetrically arranged on the two sides of the L-shaped connecting sheet, the two groups of elastic clamping sheets are in V-shaped structure, a first arc-shaped clamping part is arranged at the top end of the elastic clamping sheet, and a second arc-shaped clamping part is arranged at the end of the elastic clamping sheet away from the L-shaped connecting sheet.

[0012] The beneficial effects of the utility model are as follows:

[0013] 1、The utility model discloses scientific and novel structure, can realize the modular assembly of bulb through combined design, the clever cooperation of bulb base, annular light source plate, circular lamp plate and bulb top cover not only simplifies product structure, but also greatly improves assembly efficiency and maintenance convenience, in addition, the design of the mounting groove and the clamping block on the two sides of the bulb base makes the installation and dismounting of the bulb top cover simple and fast, and the stability of the bulb structure is ensured, and different illumination requirements can be flexibly coped with.

[0014] 2. The bulb top cover is arranged, thereby realizing the dual functions of light control and product protection, through the design of the hemispherical cover body and the circular cover body, the anti-skid blind spot, the annular diffusion grating and the sealing arc-shaped strip structure are ingeniously combined, not only the operation experience of the user is improved, but also the light distribution is effectively controlled, the glare is reduced and the bulb lighting effect is improved, simultaneously, the sealing design effectively prevents the invasion of dust and water vapor, prolongs the service life of the bulb, in addition, the combination of the circular lighting platform and the annular diffusion grating provides the user with more uniform and comfortable lighting experience.

[0015] 3. The annular light source plate and the power spring sheet assembly are arranged, thereby realizing the optimization of the internal structure of the bulb and the reliability of the electrical connection, the annular light source plate is used as the core connection platform, through the design of the cylindrical metal contact and the wire outlet hole, the internal wiring problem is ingeniously solved, and the innovative design of the power spring sheet assembly, especially the elastic clamping sheet structure, not only simplifies the electrical connection process with the circular lamp plate, but also ensures the stability and reliability of the connection, effectively reduces the failure of the bulb caused by poor connection, and improves the overall product quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0017] Figure 1 is a structural schematic view of the embodiment one of the present application;

[0018] Figure 2 is a structural schematic view of the bulb top cover in the embodiment one of the present application;

[0019] Figure 3 is a structural schematic view of the embodiment two of the present application;

[0020] Figure 4 is a structural schematic view of the bulb top cover in the embodiment two of the present application;

[0021] Figure 5 is a partial structural schematic view of the embodiment one of the present application;

[0022] Figure 6 is a structural schematic view of the annular light source plate in the embodiment one of the present application;

[0023] Figure 7 is a structural schematic view of the power spring sheet assembly in the embodiment one of the present application.

[0024] In the drawings:

[0025] 1, bulb base; 2, mounting groove; 3, clamping block; 4, annular light source plate; 401, cylindrical metal contact; 402, wire hole; 403, wire outlet hole; 5, power supply; 6, power spring piece assembly; 601, rectangular mounting piece; 602, circular through hole; 603, L-shaped connecting piece; 604, elastic clamping piece; 605, first arc-shaped clamping part; 606, second arc-shaped clamping part; 7, circular lamp plate; 8, hemispherical cover main body; 9, first anti-skid blind spot; 10, first annular mounting edge; 11, first sealing arc-shaped strip; 12, first square clamping interface; 13, circular cover body; 14, circular lighting platform; 15, second anti-skid blind spot; 16, annular diffusion grating; 17, second annular mounting edge; 18, second sealing arc-shaped strip; 19, second square clamping interface. DETAILED DESCRIPTION

[0026] To further illustrate the embodiments, the utility model provides the drawings, these drawings are part of the utility model disclosure, it mainly used to illustrate the embodiment, and can cooperate with the related description of the specification to explain the operation principle of the embodiment, cooperate with reference to these contents, the person skilled in the art should be able to understand other possible implementation modes and the advantages of the utility model, the components in the drawing are not drawn according to scale, and similar component symbols are usually used to represent similar components.

[0027] According to the embodiment of the utility model, a combined bulb structure is provided.

[0028] Embodiment one

[0029] The utility model will be further illustrated by combining with the drawings and specific embodiments, such as Figures 1-2 And Figures 5-7 As shown in the combined bulb structure according to the embodiment of the utility model, the combined bulb structure includes a bulb base 1, the top end of the bulb base 1 is provided with a bulb top cover, the two sides of the bulb base 1 are provided with mounting grooves 2, the top end of the mounting groove 2 is provided with a clamping block 3 matched with the bulb top cover, the inner top end of the bulb base 1 is provided with an annular light source plate 4, the bottom end of the annular light source plate 4 is provided with a power supply 5 in the middle, the top outer side of the annular light source plate 4 is provided with a plurality of power spring piece assemblies 6, and the top end of the annular light source plate 4 is provided with a circular lamp plate 7.

[0030] The utility model discloses scientific novel structure can realize the modular assembly of bulb through combination design, the clever cooperation of bulb base 1, annular light source board 4, circular lamp board 7 and bulb top cover not only simplifies product structure, but also improves the assembly efficiency and maintenance convenience greatly, besides, the design of the mounting groove and the clamping block of bulb base 1 makes the installation and removal of bulb top cover simple and fast, and guarantees the stability of bulb structure, and can flexibly cope with different lighting needs.

[0031] In one embodiment, for the above-mentioned bulb top cover, the bulb top cover comprises a hemispherical cover body 8 arranged at the top end of the bulb base 1, a plurality of first anti-skid blind spots 9 arranged in double rows in a circumferential direction on one side of the hemispherical cover body 8, a first annular mounting edge 10 arranged at the bottom end of the hemispherical cover body 8, and a first sealing arc-shaped strip 11 arranged at the bottom of the first annular mounting edge 10 on both sides. A first square clamping port 12 matched with the clamping block 3 is formed on both sides of the first annular mounting edge 10. The first anti-skid blind spots 9 are in the form of round protrusions, and the first anti-skid blind spots 9 in the top row are staggered with the first anti-skid blind spots 9 in the bottom row, thereby increasing the operation convenience and anti-skid effect when the user installs or removes the bulb top cover.

[0032] It should be noted that, in specific applications, the hemispherical cover body 8 and the circular cover body 13 both use polycarbonate (PC) as light diffusion material. This material changes the originally transparent PC into milky white by adding specific scattering agents in the PC, and this process does not significantly affect the basic performance of PC, while having good light diffusion performance, which can effectively scatter and homogenize the light passing through it, thereby improving the optical performance of the bulb and making the light distribution more uniform and soft.

[0033] The working principle of the bulb top cover is as follows: when installing the bulb top cover, the user can obtain a good holding feeling through the first anti-skid blind spots 9 on the hemispherical cover body 8, and easily align the bulb top cover with the position of the bulb base 1; then, the first square clamping port 12 on the first annular mounting edge 10 is precisely connected with the clamping block 3 on the bulb base 1, to realize stable clamping; at the same time, the first sealing arc-shaped strip 11 can be tightly attached to the bulb base 1, to form effective sealing and prevent dust and water vapor from entering the interior of the lamp; the design of the hemispherical cover body 8 not only plays a role in protecting the internal light source, but also can uniformly diffuse the light through its material and shape, to improve the lighting effect; in addition, the double rows of staggered first anti-skid blind spots 9 not only provide anti-skid function, but also increase the heat dissipation area of the bulb top cover to some extent, which is helpful for heat dissipation of the bulb.

[0034] In one embodiment, for the above-mentioned ring-shaped light source plate 4, a plurality of cylindrical metal contacts 401 are provided on the top end of the ring-shaped light source plate 4 and penetrate the ring-shaped light source plate 4 to cooperate with the power spring sheet assembly 6. The middle part of the cylindrical metal contact 401 is provided with a wire hole 402, and one side of the cylindrical metal contact 401 is provided with a wire outlet hole 403 penetrating the ring-shaped light source plate 4, thereby realizing reliable connection of the power supply and the light source, improving the assembly efficiency and the overall integration of the product.

[0035] The working principle of the ring-shaped light source plate 4 is as follows: the cylindrical metal contact 401 is the key component of electrical connection, and through the design of penetrating the ring-shaped light source plate 4, the electrical connection of the upper and lower surfaces is realized; the wire hole 402 allows the power supply wires connected to the circular lamp plate 7 to pass through, and the wire outlet hole 403 provides a channel for these power supply wires to lead out from the side of the ring-shaped light source plate 4. Thus, reliable connection of the power supply and the circular lamp plate 7 is realized, and the internal wiring structure is simplified; this design makes the ring-shaped light source plate 4 become the core connection platform of the entire lamp, which not only serves as the support structure of the circular lamp plate 7, but also acts as a relay station for power distribution. In this way, the ring-shaped light source plate 4 effectively integrates the various components of the lamp, improving the overall integration and assembly efficiency of the product.

[0036] In one embodiment, for the above-mentioned power spring sheet assembly 6, the power spring sheet assembly 6 includes a rectangular mounting sheet 601 arranged on the top of the ring-shaped light source plate 4, a circular through hole 602 is arranged in the middle of the rectangular mounting sheet 601 and cooperates with the cylindrical metal contact 401, one end of the rectangular mounting sheet 601 is provided with an L-shaped connecting sheet 603, two elastic clamping sheets 604 are symmetrically arranged on both sides of the L-shaped connecting sheet 603, and the two groups of elastic clamping sheets 604 are in V-shaped structure, the top end of the elastic clamping sheet 604 is provided with a first arc-shaped clamping part 605, and the end of the elastic clamping sheet 604 away from the L-shaped connecting sheet 603 is provided with a second arc-shaped clamping part 606, thereby being able to firmly fix the power supply wires between the power supply 5 and the circular lamp plate 7.

[0037] In addition, it should be noted that the circular lamp plate 7 is a common LED lighting element, which has a circular sheet structure, and the diameter is usually matched with the size of the bulb, including a substrate, LED beads, and conductive lines; wherein the substrate is made of flexible printed circuit board (FPC) material, which has the characteristics of lightness, thinness and flexibility; the LED beads are rectangular small bulbs, and the LED beads are distributed on the top surface of the circular lamp plate 7 in a circular array, and different numbers and arrangements can be used according to the lighting needs; the substrate is printed with conductive lines connecting the LED beads at the bottom end, and metal contacts are provided at the bottom edge of the circular lamp plate 7, which are connected to the power supply 5 through wires, and the other end of the wire is inserted between the elastic clamping sheets 604 of the power spring sheet assembly 6 and is firmly clamped, thereby establishing a stable electrical connection.

[0038] The working principle of the power spring sheet assembly 6 is that the rectangular mounting sheet 601 serves as a basic structure, precisely butts against the cylindrical metal contact 401 on the annular light source plate 4 through the circular through hole 602, and ensures the accuracy of overall positioning; the L-shaped connecting sheet 603 provides structural support and serves as a fixed point for power connection; the V-shaped structure of the elastic clamping sheet 604 provides good elasticity and can adapt to different specifications of wires; the first and second arc-shaped clamping parts 605 and 606 jointly form a reliable clamping mechanism for firmly fixing the power supply wires from the circular lamp plate 7; when the power supply wires inserted into the bottom end of the circular lamp plate 7, the elastic clamping sheet 604 will slightly separate, and then tightly clamps the wires under the action of its own elastic force, forming a stable electrical and mechanical connection. This design not only facilitates installation and removal, but also can adapt to slight vibration and thermal expansion and contraction, maintaining a long-term stable connection state.

[0039] Embodiment Two

[0040] As Figures 3-4 On the basis of Embodiment One, the bulb top cover includes a circular cover body 13, the top end of the circular cover body 13 is provided with a circular lighting platform 14, the top end of the circular cover body 13 is provided with a plurality of second anti-skid blind spots 15 arranged in double rows in a circular manner, the outer side of the circular cover body 13 is provided with an annular diffusion grating 16, and the bottom end of the annular diffusion grating 16 is provided with a second annular mounting edge 17; the bottom of the two sides of the second annular mounting edge 17 is provided with a second sealing arc-shaped strip 18, and the two sides of the second annular mounting edge 17 are provided with second square clamping interfaces 19 matched with the clamping blocks 3; the second anti-skid blind spots 15 are in the form of circular dot-shaped protrusions, and the second anti-skid blind spots 15 in the top row are staggered with the second anti-skid blind spots 15 in the bottom row, thereby improving the operation performance and light illumination effect of the bulb top cover.

[0041] The working principle of the bulb top cover is that when installing the bulb top cover, the user can obtain a good holding feeling by using the second anti-skid blind spots 15 on the circular cover body 13, and easily aligns the bulb top cover with the bulb base 1; the second square clamping interfaces 19 of the second annular mounting edge 17 are precisely butted against the clamping blocks 3 on the bulb base 1, achieving stable clamping; at the same time, the second sealing arc-shaped strip 18 is closely attached to the bulb base 1, forming effective sealing protection; the circular lighting platform 14 serves as the main light source outlet, concentrating most of the light output, while the second anti-skid blind spots 15 arranged in double rows in a staggered manner provide anti-skid function; in addition, the annular diffusion grating 16 plays a role in light adjustment and diffusion on the side, effectively reducing glare, improving the uniformity and comfort of illumination, and also increasing the heat dissipation area of the bulb, which is helpful for heat dissipation, so that the bulb structure can play the best effect in various lighting environments.

[0042] In order to facilitate the understanding of the above technical solutions of the utility model, the working principle or operation mode of the utility model in the actual process is explained in detail below.

[0043] In actual application, the user first installs the bulb base 1 on the designated lamp interface. Then, the annular light source plate 4 is installed in the inside of the bulb base 1, while ensuring that the power supply 5 is correctly connected to the annular light source plate 4. Next, the power spring sheet assembly 6 is installed on the top outside of the annular light source plate 4, so that the cylindrical metal contact 401 is accurately docked with the circular through hole 602 of the power spring sheet assembly 6. When installing the circular lamp plate 7, it is gently pressed into the top end of the annular light source plate 4, so that the connection of the metal contact of the circular lamp plate 7 and the power supply wire of the power supply 5 and the elastic clamping sheet 604 of the power spring sheet assembly 6 is in close contact, ensuring the reliability of the electrical connection. At this time, the elastic clamping sheet 604 will be slightly separated, and then tightly clamps the contact of the circular lamp plate 7 under the action of its own elastic force.

[0044] Finally, a suitable bulb top cover (which can be a hemispherical cover body 8 or a circular cover body 13) is selected. Taking the circular cover body 13 as an example, the user can obtain a good holding feeling through the second anti-skid blind spot 15, and align the bulb top cover with the bulb base 1. The bulb top cover is gently pressed down, so that the second square clamping interface 19 is accurately docked with the clamping block 3 on the bulb base 1, until a "click" sound is heard, indicating that it is installed in place. After installation is completed, the annular diffusion grating 16 will play a role in light adjustment and diffusion on the side, effectively reducing glare and improving the uniformity of illumination. The circular lighting platform 14 serves as the main light source outlet, concentrating most of the light output. The second sealing arc-shaped strip 18 is tightly attached to the bulb base 1, forming an effective sealing protection to prevent dust and water vapor from entering the inside of the lamp.

[0045] In the utility model, unless otherwise expressly provided and limited, the terms "install", "set", "connect", "fix", "screw" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two elements, unless otherwise expressly limited, the above-mentioned terms in the utility model can be understood according to the specific meaning in the utility model by the person skilled in the art.

[0046] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A combined bulb structure comprising a bulb base (1), characterized in that, The top end of the lamp base (1) is provided with a lamp top cover, both sides of the lamp base (1) are provided with mounting grooves (2), the top end of the mounting groove (2) is provided with a clamping block (3) matched with the lamp top cover, the inner top end of the lamp base (1) is provided with an annular light source plate (4), the middle bottom end of the annular light source plate (4) is provided with a power supply (5), the top outer side of the annular light source plate (4) is provided with a plurality of power spring sheet assemblies (6), and the top end of the annular light source plate (4) is provided with a circular lamp plate (7).

2. A combination light bulb structure as defined in claim 1, wherein The lamp top cover comprises a hemispherical cover body (8) arranged at the top end of the lamp base (1), one side of the hemispherical cover body (8) is provided with a plurality of first anti-skid blind spots (9) arranged in double rows in a circumferential direction, and the bottom end of the hemispherical cover body (8) is provided with a first annular mounting edge (10), and the bottom of both sides of the first annular mounting edge (10) is provided with a first sealing arc-shaped strip (11).

3. A combination light bulb structure as defined in claim 2, wherein The first annular mounting edge (10) is provided with a first square clamping port (12) matched with the clamping block (3) on both sides, the first anti-skid blind spot (9) is in a circular dot protruding structure, and the first anti-skid blind spots (9) in the top row are staggered with the first anti-skid blind spots (9) in the bottom row.

4. The combination light bulb structure of claim 1, wherein The lamp top cover comprises a circular cover body (13), the top end of the circular cover body (13) is provided with a circular lighting platform (14), one side of the top end of the circular cover body (13) is provided with a plurality of second anti-skid blind spots (15) arranged in double rows in a circumferential direction, the outer side of the circular cover body (13) is provided with an annular diffusion grating (16), and the bottom end of the annular diffusion grating (16) is provided with a second annular mounting edge (17).

5. A combination light bulb structure as defined in claim 4, wherein The bottom of both sides of the second annular mounting edge (17) is provided with a second sealing arc-shaped strip (18), and the second annular mounting edge (17) is provided with a second square clamping port (19) matched with the clamping block (3) on both sides, the second anti-skid blind spot (15) is in a circular dot protruding structure, and the second anti-skid blind spots (15) in the top row are staggered with the second anti-skid blind spots (15) in the bottom row.

6. The combination light bulb structure of claim 1, wherein The top end of the annular light source plate (4) is provided with a plurality of cylindrical metal contacts (401) matched with the power spring sheet assembly (6), the middle part of the cylindrical metal contact (401) is provided with a wire hole (402), and one side of the cylindrical metal contact (401) is provided with a wire outlet hole (403) penetrating through the annular light source plate (4).

7. A combination light bulb structure as defined in claim 6, wherein The power spring sheet assembly (6) comprises a rectangular mounting sheet (601) arranged at the top of the annular light source plate (4), the middle part of the rectangular mounting sheet (601) is provided with a circular through hole (602) matched with the cylindrical metal contact (401), and one end of the rectangular mounting sheet (601) is provided with an L-shaped connecting sheet (603).

8. A combination light bulb structure as defined in claim 7, wherein Two sides of the L-shaped connecting piece (603) are symmetrically provided with elastic clamping pieces (604), and the two groups of elastic clamping pieces (604) are in V-shaped structure, the top end of the elastic clamping piece (604) is provided with a first arc-shaped clamping part (605), and the end of the elastic clamping piece (604) away from the L-shaped connecting piece (603) is provided with a second arc-shaped clamping part (606).

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