Insulation lightning protection support for single-layer roof system

Abstract

The utility model discloses an insulating lightning-protection support for a single-layer roof system, which is characterized by comprising a supporting base and a limiting mechanism, the limiting mechanism is connected with the supporting base through a supporting pipe, and the supporting base can be welded and fixed with a waterproof roll; the limiting mechanism comprises a first limiting part and a second limiting part which are oppositely arranged, a limiting space with the two ends penetrating through is formed between the first limiting part and the second limiting part, the bottom of the first limiting part is installed on the top face of the supporting pipe, and the second limiting part is connected with the first limiting part in a clamped mode. Two oppositely-arranged insulating spacers are arranged in the limiting space, one insulating spacer is installed at the top of the limiting space, and the other insulating spacer is installed at the bottom of the limiting space. According to the utility model, the installation convenience is improved, the construction difficulty is reduced, and the service life is prolonged.

Description

Technical Field

[0001] This utility model relates to a lightning protection bracket, and more particularly to an insulating lightning protection bracket for a single-story roof system. Background Technology

[0002] Single-layer flexible roofing systems are characterized by their light weight, excellent waterproofing and thermal insulation, quick construction, easy maintenance, and long lifespan, making them widely used in the roofs of manufacturing plants, data centers, and transportation hubs. When installing lightning protection brackets and conductors on the roofs of industrial buildings such as manufacturing plants, data centers, and warehousing and logistics facilities, it is necessary to consider how to stably connect them to the roof and ensure they meet the characteristics of single-layer flexible roofing systems, achieving a balance cycle state with the same lifespan as the roofing system.

[0003] In existing technologies, common flexible roof lightning protection brackets are supported in the following ways:

[0004] The first method involves concrete counterweight blocks, which use their own weight combined with fixed supports to provide fixed support for the lightning protection conductors. However, the concrete counterweight blocks are quite heavy, and since the lightweight steel roof itself is relatively light, they are sensitive to loads. If the design doesn't provide sufficient load margin, it's possible that reinforcing the existing roof is necessary before implementing the concrete counterweights, leading to a trade-off. Furthermore, due to the inherent soft settlement characteristics of single-layer flexible roofs, the concrete counterweight blocks can easily dent and pull on the roof waterproofing material. Water accumulation after rainfall is also a concern, and in humid weather, microorganisms can easily grow, affecting the lifespan of the roofing membrane.

[0005] The second method involves plastic blocks, an upgraded version of concrete counterweights. These blocks utilize a snap-fit ​​design and offer advantages such as lightweight construction and ease of installation. However, plastic blocks also have some drawbacks: 1. Due to the properties of plastic, their compressive strength and aging resistance are not high. Although there are many support points for the lightning conductors, factors such as construction and maintenance personnel tripping over them could lead to collapse or damage. 2. The open design, combined with the unevenness of a single-layer flexible roof, could cause the lightning conductors to detach or the snap-fit ​​to break. 3. Despite their lightweight nature, displacement loss is possible, as they are fixed by their own weight, potentially leading to tilting or collapse later. 4. If cement mortar is poured into the plastic blocks, the same problems as with concrete counterweights exist.

[0006] The third type is the conventional metal bracket for roofs. This type of bracket requires damaging the roof's waterproofing layer and is connected and fixed to the roof structure with nails. While this metal bracket structure is strong and can withstand tensile, compressive, and shear forces without deformation or bending, it compromises the roof's waterproofing, adds a waterproofing bottleneck, and, due to its smaller size, makes proper waterproofing difficult, potentially leading to leaks. Summary of the Invention

[0007] The purpose of this utility model is to provide an insulating lightning protection bracket for a single-layer roof system. By using this structure, the service life can be extended, the waterproof effect can be guaranteed, the construction convenience can be improved, and the application range can be expanded.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is: an insulating lightning protection bracket for a single-layer roof system, comprising a support base and a limiting mechanism, wherein the limiting mechanism is connected to the support base via a support tube, and the support base can be welded and fixed to a waterproof membrane;

[0009] The limiting mechanism includes a first limiting part and a second limiting part arranged opposite to each other. The first limiting part and the second limiting part form a limiting space that extends through both ends. The bottom of the first limiting part is installed on the top surface of the support tube, and the second limiting part is snapped together with the first limiting part.

[0010] The limiting space is provided with two oppositely arranged insulating pads, one of which is installed at the top of the limiting space and the other at the bottom of the limiting space.

[0011] In the above technical solution, a first groove is provided in the middle of the top surface of the first limiting part, and a second groove is provided in the middle of the bottom surface of the second limiting part, with the first groove facing the second groove.

[0012] One of the insulating pads is mounted above the second groove, and the other insulating pad is mounted below the first groove.

[0013] In the above technical solution, the top surface of the insulating pad in the first groove is exposed above the top surface of the first groove, and the bottom surface of the insulating pad in the second groove is exposed below the bottom surface of the second groove.

[0014] In the above technical solution, the top of the first groove is provided with inwardly extending first limiting protrusions on both sides, and the upper part of the insulating pad in the first groove is limited to the first groove by the first limiting protrusions;

[0015] The bottom sides of the second groove are respectively provided with inwardly extending second limiting protrusions, and the lower part of the insulating pad in the second groove is limited to the second groove by the second limiting protrusions.

[0016] In the above technical solution, the bottom surface of the upper insulating pad is provided with an upwardly recessed arc-shaped groove in the middle, and the top surface of the lower insulating pad is provided with a downwardly recessed arc-shaped groove in the middle. The arc-shaped groove of the upper insulating pad is directly opposite the arc-shaped groove of the lower insulating pad.

[0017] In the above technical solution, the first limiting part is provided with outwardly extending first locking parts on both sides, and the second limiting part is provided with downwardly extending second locking parts on both sides, and each first locking part is locked and connected to a second locking part.

[0018] The second snap-fit ​​part is an elastic structure. The middle part of the inner side of the second snap-fit ​​part is provided with a slot that cooperates with the first snap-fit ​​part. The first snap-fit ​​part is snapped into the corresponding slot.

[0019] In the above technical solution, the top of the support tube is provided with a connecting hole, and the inner wall of the connecting hole is provided with a number of protruding ribs arranged parallel to the extension direction of the connecting hole.

[0020] In the above technical solution, the support tube includes an inner tube, an outer tube, and at least two connecting ribs. The inner tube is coaxially disposed inside the outer tube, and multiple connecting ribs are arranged around the outside of the inner tube. The two ends of the connecting ribs are respectively connected to the outer wall of the inner tube and the inner wall of the outer tube.

[0021] The connecting hole is coaxially disposed in the middle of the inner tube.

[0022] In the above technical solution, the first limiting part is connected to the support tube via a first self-tapping screw; the first self-tapping screw is inserted into the connecting hole, and the first self-tapping screw is screwed to multiple of the ribs.

[0023] In the above technical solution, the support base is coaxially disposed at the bottom of the support tube, and the support base includes a sealing plate and a connecting plate coaxially disposed. The outer diameter of the sealing plate is larger than the outer diameter of the connecting plate, and the sealing plate is disposed between the connecting plate and the support tube.

[0024] The connecting piece is connected to the bottom of the support tube via a second self-tapping screw. The second self-tapping screw is inserted into the connecting hole and is screwed to multiple of the raised ribs.

[0025] And / or, two positioning holes are symmetrically provided at the outer edge of the sealing sheet.

[0026] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0027] 1. This utility model utilizes a support base that can be welded and fixed to the waterproof membrane, which can be adapted to flexible roofs, improve the scope of application, ensure service life, and also ensure waterproof effect;

[0028] 2. In this utility model, the limiting mechanism is connected to the supporting base via a supporting tube. The limiting mechanism uses a first limiting part and a second limiting part that are relatively set and interlocked to limit the lightning protection lead wire, thereby improving the convenience of construction.

[0029] 3. The limiting space in this utility model can limit the movement of circular and square lightning protection leads, thus improving its applicability;

[0030] 4. In this utility model, a rib is provided inside the support tube, and the self-tapping screw is connected to the rib, which can reduce the assembly difficulty and also ensure the locking effect.

[0031] 5. In this utility model, two oppositely arranged insulating pads are set in the limiting space, and the lightning protection lead is set between the two insulating pads. By using the insulating pads, the lightning protection lead made of different materials can be separated from the lightning protection bracket, effectively isolating the two different materials from direct contact, preventing the two materials from coming into contact and causing an electrochemical reaction, preventing corrosion problems, and playing a role in protecting and extending service life. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of this utility model;

[0033] Figure 2 yes Figure 1 Side view;

[0034] Figure 3 yes Figure 1 Top view;

[0035] Figure 4 yes Figure 1 A magnified view of a portion of the middle limit mechanism;

[0036] Figure 5 This is a schematic diagram of the end face structure of the support tube in Embodiment 1 of this utility model.

[0037] The components are as follows: 1. Support base; 11. Sealing plate; 12. Connecting plate; 13. Second self-tapping screw; 14. Positioning port; 2. Limiting mechanism; 21. First limiting part; 22. Second limiting part; 23. Limiting space; 24. First snap-fit ​​part; 25. Second snap-fit ​​part; 26. First groove; 27. Second groove; 28. Insulating gasket; 29. ​​First limiting protrusion; 201. Second limiting protrusion; 202. Slot; 3. Support tube; 31. Connecting hole; 32. Rib; 33. First self-tapping screw; 34. Inner tube; 35. Outer tube; 36. Connecting rib. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0039] Example 1: See Figures 1-5 As shown, an insulating lightning protection bracket for a single-layer roof system includes a support base 1 and a limiting mechanism 2. The limiting mechanism 2 is connected to the support base 1 via a support tube 3. The support base 1 can be welded and fixed to a waterproof membrane.

[0040] The limiting mechanism 2 includes a first limiting part 21 and a second limiting part 22 arranged opposite to each other. The first limiting part 21 and the second limiting part 22 form a limiting space 23 that extends through both ends. The bottom of the first limiting part 21 is installed on the top surface of the support tube 3, and the second limiting part 22 is snapped into connection with the first limiting part 21.

[0041] The first limiting part 21 has outwardly extending first engaging parts 24 on both sides, and the second limiting part 22 has downwardly extending second engaging parts 25 on both sides. Each first engaging part 24 is engaged with a second engaging part 25.

[0042] In this embodiment, the single-layer roof can be a flexible roof with a waterproof membrane. The support base is directly welded to the roof waterproof membrane, thereby fixing the lightning protection bracket to the roof. Even if the flexible roof deforms or becomes uneven, it will not affect the firmness and stability of the lightning protection bracket installation. Taking the illustrated direction as an example, the limiting space runs through the front and rear faces of the limiting mechanism. Before the lightning conductor is installed, the second limiting part and the first limiting part are not engaged. The lightning conductor is placed on top of the first limiting part, with the lightning conductor positioned between the first engaging parts on both sides. Then, the second limiting part is placed above the lightning conductor and the first limiting part, and then engaged by the second engaging part. This achieves the limiting of the lightning conductor, ensuring that the lightning conductor is within the limiting space and will not move up, down, left, or right. Only the end of the lightning conductor needs to be limited. The number and arrangement of the lightning protection brackets can be adjusted and installed according to the layout of the lightning conductor. In this structure, the lightning protection bracket is easy to install, and the lightning conductor is also easy and quick to install.

[0043] See Figure 1 , 3 As shown, the top surface of the first limiting part 21 is provided with a first groove 26, and the bottom surface of the second limiting part 22 is provided with a second groove 27. The first groove 26 is positioned directly opposite the second groove 27.

[0044] The first limiting part 21, the second limiting part 22 and the second locking parts 25 on both sides constitute the limiting space 23.

[0045] In this embodiment, under normal circumstances, the bottom surface of the second limiting part can abut against the top surface of the first limiting part. Through the provision of the second engaging part, the second engaging part and the first engaging part engage, thereby raising the second limiting part and creating a certain space between the bottom surface of the second limiting part and the top surface of the first limiting part. This space is elongated and can be used to limit lightning conductors with a rectangular cross-section. The provision of the first groove and the second groove allows for the limitation of lightning conductors with a circular cross-section.

[0046] See Figure 1 , 3 As shown, insulating pads 28 are respectively provided in the first groove 26 and the second groove 27. The top surface of the insulating pad 28 in the first groove 26 is exposed above the top surface of the first groove 26, and the bottom surface of the insulating pad 28 in the second groove 27 is exposed below the bottom surface of the second groove 27.

[0047] In this embodiment, the outer surface of the top middle portion of the insulating pad in the first groove is a concave arc-shaped surface. Both ends of the top surface of the insulating pad protrude above the top surface of the first limiting portion, and there is a vertical distance between the top surface of the insulating pad and the top surface of the first limiting portion. The middle portion of the bottom surface of the insulating pad in the second groove is a concave arc-shaped surface. Both ends of the bottom surface of the insulating pad protrude below the bottom surface of the second limiting portion, and there is a vertical distance between the bottom surface of the insulating pad and the bottom surface of the second limiting portion. When limiting a lightning rod with a circular cross-section, the top and bottom outer surfaces of the lightning rod are directly opposite the first and second grooves, respectively. The bottom outer surface of the lightning rod contacts the arc-shaped surface of the insulating pad in the first groove, and the top outer surface of the lightning rod contacts or is close to the arc-shaped surface of the insulating pad in the second groove (if the diameter of the lightning rod is smaller than the distance between the arc-shaped surfaces of the two insulating pads, the lightning rod may not contact the upper insulating pad, but under load, it will definitely contact the lower insulating pad).

[0048] The limiting mechanism is generally made of lightweight, high-strength aluminum alloy, while the lightning protection lead is generally made of carbon steel. When the aluminum alloy and carbon steel lightning protection lead come into contact, a certain electrochemical reaction will occur due to the difference in their chemical composition and potential, which will cause corrosion and eventually damage the materials. Therefore, an insulating protective rubber gasket is used to effectively isolate the two different materials from direct contact, which plays a role in protecting and extending the service life.

[0049] Furthermore, since the upper insulating pad extends downwards below the bottom surface of the second limiting part, and the lower insulating pad extends upwards above the top surface of the first limiting part, when the lightning protection conductor with a square cross-section is affected by the limiting, the insulating pads exposed at the top of the first limiting part and the bottom of the second limiting part will abut against the limiting, thereby allowing the lightning protection conductor of this shape to directly contact the limiting mechanism and extend its service life.

[0050] See Figure 1 , 3 As shown, the top of the first groove 26 is provided with inwardly extending first limiting protrusions 29 on both sides, and the upper part of the insulating pad 28 in the first groove 26 is limited within the first groove 26 by the first limiting protrusions 29.

[0051] The bottom sides of the second groove 27 are respectively provided with inwardly extending second limiting protrusions 201, and the lower part of the insulating pad 28 in the second groove 27 is limited within the second groove 27 by the second limiting protrusions 201.

[0052] The first and second limiting protrusions are provided to confine the insulating pad within the corresponding first or second groove, preventing it from detaching and ensuring the firmness of the limiting.

[0053] See Figure 1 , 3 As shown, the second snap-fit ​​part 25 is an elastic structure. The middle part of the inner side of the second snap-fit ​​part 25 is provided with a slot 202 that cooperates with the first snap-fit ​​part 24. The first snap-fit ​​part 24 is snapped into the corresponding slot 202.

[0054] The bottom inner surface of the second locking part is sloped inward from bottom to top. When the second limiting part and the first limiting part engage, the second locking part is directly aligned with the first locking part, and then pressed down, so that the slope of the second locking part contacts the first locking part. Pressing down causes the second locking part to deform outward. When it moves to the slot, the second locking part returns to its original shape, thus achieving the locking and limiting of the first and second locking parts. To disassemble, forcefully pry the bottom of the second locking part outward, causing the first locking part to disengage from the slot, and then lift the second limiting part to disengage from the first limiting part, thus disassembling the limiting mechanism.

[0055] See Figure 1 , 5 As shown, the top of the support tube 3 is provided with a connecting hole 31, and the inner wall of the connecting hole 31 is provided with a plurality of protruding ribs 32 arranged parallel to the extending direction of the connecting hole 31.

[0056] The first limiting part 21 is connected to the support tube 3 via the first self-tapping screw 33; the first self-tapping screw 33 is inserted into the connecting hole 31, and the first self-tapping screw 33 is screwed to multiple of the protruding ribs 32.

[0057] In this embodiment, the bottom of the first self-tapping screw first passes through the first groove, then drills a hole in the first limiting part, inserts it into the connecting hole, and then screws the first self-tapping screw into the rib, thus connecting the first limiting part and the support tube. In this embodiment, if the support tube does not have a connecting hole and adopts a solid structure, the support tube is preferably made of aluminum alloy. If it is a solid structure, the operator needs to exert a lot of force to screw the self-tapping screw into the support tube, making self-tapping difficult. Therefore, in this embodiment, a connecting hole is used. The diameter of the connecting hole is larger than the diameter of the first self-tapping screw, while the diameter of the circle formed by the inner surfaces of the multiple ribs is smaller than the diameter of the first self-tapping screw. Therefore, the self-tapping screw of the first self-tapping screw and the multiple ribs can effectively reduce the difficulty of self-tapping and drilling, improve assembly efficiency, and the engagement between the multiple ribs and the first self-tapping screw is tight, resulting in good connection strength.

[0058] See Figure 3 , 5 As shown, the support tube 3 includes an inner tube 34, an outer tube 35, and at least two connecting ribs 36. The inner tube 34 is coaxially disposed inside the outer tube 35, and multiple connecting ribs 36 are arranged around the outside of the inner tube 34. The two ends of the connecting ribs 36 are respectively connected to the outer wall of the inner tube 34 and the inner wall of the outer tube 35.

[0059] The connecting hole 31 is coaxially disposed in the middle of the inner tube 34.

[0060] In this structure, the support tubes are hollow inner and outer tubes, and the inner and outer tubes are connected by connecting ribs. This reduces weight, material usage, and cost while ensuring strength.

[0061] See Figures 1-3 As shown, the support base 1 is coaxially disposed at the bottom of the support tube 3. The support base 1 includes a sealing plate 11 and a connecting plate 12 coaxially disposed. The outer diameter of the sealing plate 11 is larger than the outer diameter of the connecting plate 12. The sealing plate 11 is disposed between the connecting plate 12 and the support tube 3.

[0062] The connecting piece 12 is connected to the bottom of the support tube 3 via a second self-tapping screw 13. The second self-tapping screw 13 is inserted into the connecting hole 31 and is screwed to multiple protruding ribs 32.

[0063] The connection method between the second self-tapping screw and the support tube is the same as that between the first self-tapping screw and the support tube, and they have the same function. While ensuring the connection strength between the two, they can also reduce the difficulty of assembly.

[0064] The sealing plate can be welded and fixed to the waterproof membrane. The sealing plate and waterproof membrane (made of the same material) can be hot-air welded, which not only fixes the lightning protection bracket to the roof but also seals the connection, resulting in a stronger waterproof effect. The connecting plate is used to connect and fix the sealing plate and the support pipe. Furthermore, the connecting plate has a concave cavity in the middle, where the bottom surface of the second self-tapping screw will be located, so that the second self-tapping screw will not damage the roof after the sealing plate is welded to the waterproof membrane.

[0065] The sealing sheet 11 has two symmetrically arranged positioning ports 14 on its outer edge. The positioning ports facilitate construction and installation positioning, improve construction convenience, and increase construction efficiency.

[0066] Furthermore, in this utility model, since the self-tapping screws are used to connect the sealing plate and the support tube, and the limiting mechanism is also connected to the support tube through the self-tapping screws, both the limiting mechanism and the sealing plate can be adjusted at a certain small angle relative to the support tube. If the lightning protection lead wire is bent and deformed, it can be rotated appropriately to meet the application requirements during construction and installation.

[0067] Of course, in this utility model, the support base can also be a simple metal connecting piece. The metal connecting piece is directly connected to the support tube by the second self-tapping screw. The support base does not have a sealing plate. A coating that can be welded to the roofing membrane is applied to the bottom of the metal connecting piece. The coating of the metal connecting piece and the unwound membrane can be welded together using a hot air gun.

[0068] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of the invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0069] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. For instance, the two components can be mechanically connected by contact or abutting; they can also be directly hooked or connected by an intermediate medium; or they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. An insulating lightning protection bracket for a single-story roof system, characterized in that: It includes a support base and a limiting mechanism. The limiting mechanism is connected to the support base via a support tube. The support base can be welded and fixed to the waterproof membrane. The limiting mechanism includes a first limiting part and a second limiting part arranged opposite to each other. The first limiting part and the second limiting part form a limiting space that extends through both ends. The bottom of the first limiting part is installed on the top surface of the support tube, and the second limiting part is snapped together with the first limiting part. The limiting space is provided with two oppositely arranged insulating pads, one of which is installed at the top of the limiting space and the other at the bottom of the limiting space.

2. The insulating lightning protection bracket for a single-story roof system according to claim 1, characterized in that: The top surface of the first limiting part is provided with a first groove in the middle, and the bottom surface of the second limiting part is provided with a second groove in the middle, with the first groove facing the second groove. One of the insulating pads is mounted above the second groove, and the other insulating pad is mounted below the first groove.

3. The insulating lightning protection bracket for a single-story roof system according to claim 2, characterized in that: The top surface of the insulating pad in the first groove is exposed above the top surface of the first groove, and the bottom surface of the insulating pad in the second groove is exposed below the bottom surface of the second groove.

4. The insulating lightning protection bracket for a single-story roof system according to claim 3, characterized in that: The top of the first groove is provided with inwardly extending first limiting protrusions on both sides, and the upper part of the insulating pad in the first groove is limited to the first groove by the first limiting protrusions; The bottom sides of the second groove are respectively provided with inwardly extending second limiting protrusions, and the lower part of the insulating pad in the second groove is limited to the second groove by the second limiting protrusions.

5. The insulating lightning protection bracket for a single-story roof system according to claim 1, characterized in that: The upper insulating pad has an upwardly recessed arc-shaped groove in the middle of its bottom surface, and the lower insulating pad has a downwardly recessed arc-shaped groove in the middle of its top surface. The arc-shaped groove of the upper insulating pad is directly opposite the arc-shaped groove of the lower insulating pad.

6. The insulating lightning protection bracket for a single-story roof system according to claim 1, characterized in that: The first limiting part is provided with outwardly extending first engaging parts on both sides, and the second limiting part is provided with downwardly extending second engaging parts on both sides, and each first engaging part is engaged with a second engaging part. The second snap-fit ​​part is an elastic structure. The middle part of the inner side of the second snap-fit ​​part is provided with a slot that cooperates with the first snap-fit ​​part. The first snap-fit ​​part is snapped into the corresponding slot.

7. The insulating lightning protection bracket for a single-story roof system according to claim 1, characterized in that: The top of the support tube is provided with a connection hole, and the inner wall of the connection hole is provided with a number of raised ribs arranged parallel to the extension direction of the connection hole.

8. The insulating lightning protection bracket for a single-story roof system according to claim 7, characterized in that: The support tube includes an inner tube, an outer tube, and at least two connecting ribs. The inner tube is coaxially disposed inside the outer tube, and multiple connecting ribs are arranged around the outside of the inner tube. The two ends of the connecting ribs are respectively connected to the outer wall of the inner tube and the inner wall of the outer tube. The connecting hole is coaxially disposed in the middle of the inner tube.

9. The insulating lightning protection bracket for a single-story roof system according to claim 7, characterized in that: The first limiting part is connected to the support tube via a first self-tapping screw; the first self-tapping screw is inserted into the connecting hole, and the first self-tapping screw is screwed to multiple of the raised ribs.

10. The insulating lightning protection bracket for a single-story roof system according to claim 7, characterized in that: The support base is coaxially disposed at the bottom of the support tube. The support base includes a sealing plate and a connecting plate coaxially disposed. The outer diameter of the sealing plate is larger than the outer diameter of the connecting plate. The sealing plate is disposed between the connecting plate and the support tube. The connecting piece is connected to the bottom of the support tube via a second self-tapping screw. The second self-tapping screw is inserted into the connecting hole and is screwed to multiple of the raised ribs. And / or, two positioning holes are symmetrically provided at the outer edge of the sealing sheet.

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