Sealing waterproof structure

Abstract

The utility model relates to the technical field of charging equipment, and discloses a sealing waterproof structure which is low in processing cost, small in cover plate thickness and narrow in sealing area width, and comprises a bottom box provided with a mounting port, a mounting ring fixed at the mounting port, a sealing ring, a cover plate and a connecting assembly, a plurality of first inserting holes and a plurality of fixing pieces fixed to the lower portion of the mounting ring are formed in the mounting ring at intervals, the top ends of the fixing pieces are inserted into the first inserting holes to form first limiting steps, and inserting grooves are formed in the fixing pieces; a plurality of second insertion holes are formed in the sealing ring; a plurality of counter bores are formed in the cover plate; the connecting assembly comprises a plurality of step screws, each step screw comprises a screw head, a first stud section and a second stud section which are sequentially connected, the diameter of the first stud section is larger than that of the second stud section, a second limiting step is formed on the connecting portion of the first stud section and the second stud section, and the step screws sequentially penetrate through the counter bores, the second inserting holes and the first inserting holes and are inserted into the inserting grooves. The second limiting step abuts against the first limiting step, and the second stud section is in threaded connection with the inserting groove.

Description

Technical Field

[0001] The utility model relates to the technical field of charging equipment, in particular to a sealing and waterproof structure. Background Art

[0002] Equipment such as charging piles and outdoor cabinets often come into contact with rainwater when in use. In order to avoid short circuits or leakage accidents caused by rainwater seeping into the chassis, the chassis needs to be sealed to block the rainwater leakage channel. At present, the industry mostly opens grooves on the cover plate, embeds the rubber sealing ring into the groove, and locks the cover plate by snapping or riveting, so that the rubber sealing ring compresses and blocks the gap between the box body and the cover plate. However, for sheet metal chassis, the processing cost of the groove is relatively high, which will increase the production cost of the chassis; furthermore, the cover plate using this kind of sealing and waterproof structure is relatively thick, and the sealing area used to install the sealing ring needs to occupy a large width dimension, which is difficult to meet the processing requirements of products with thickness requirements. Utility Model Content

[0003] Based on this, it is necessary to provide a sealing and waterproof structure with low processing cost, small cover plate thickness and narrow sealing area width to address the above-mentioned shortcomings.

[0004] A sealed waterproof structure for encapsulating a charging module of a charging device, comprising:

[0005] A bottom box, wherein a receiving cavity is provided in the bottom box, and an installation opening communicating with the receiving cavity is provided on the upper surface of the bottom box;

[0006] A mounting ring, wherein the mounting ring is arranged at the mounting opening, the outer edge contour of the mounting ring is adapted to the inner contour shape of the mounting opening, the outer ring surface of the mounting ring is fitted with and fixedly connected to the inner surface of the mounting opening, a plurality of first plug holes are arranged at intervals on the upper surface of the mounting ring, a plurality of fixing members corresponding to the first plug holes and fixedly connected to the mounting ring are arranged below the mounting ring, the top end of the fixing member is inserted into the first plug hole and forms a first limiting step in the first plug hole, and a slot communicating with the first plug hole is arranged on the top of the fixing member;

[0007] A sealing ring, the sealing ring is arranged on the upper surface of the mounting ring, and the sealing ring is provided with a plurality of second plug holes corresponding to each other and connected to the first plug holes;

[0008] A cover plate, the cover plate is disposed on the upper surface of the sealing ring, and the cover plate is provided with a plurality of countersunk holes corresponding to each of the second plug holes; and

[0009] A connecting component, the connecting component includes a plurality of step screws corresponding to each of the countersunk holes one by one, the step screw includes a screw head, a first stud section fixedly connected to the lower surface of the screw head, and a second stud section fixedly connected to the lower surface of the first stud section, the diameter of the first stud section is greater than the diameter of the second stud section, and the connecting portion of the first stud section and the second stud section forms a second limiting step, the step screw passes through the countersunk hole, the second insertion hole, and the first insertion hole in sequence and is inserted into the slot, the second limiting step abuts against the first limiting step, and the second stud section is threadedly connected to the inner surface of the slot.

[0010] In one embodiment, the projection length of the arrangement positions of two adjacent first plug holes on the annular path of the mounting ring is between 80-100 mm.

[0011] In one embodiment, the diameter of the first stud section is between 3-5 mm, and the diameter of the second stud section is between 3-4 mm.

[0012] In one embodiment, the sealing ring is made of silicone or rubber material.

[0013] In one embodiment, the fixing member is fixed to the mounting ring by riveting or welding.

[0014] In one embodiment, the fixing member is integrally formed with the mounting ring.

[0015] In one embodiment, the ring side surface of the fixing member is raised near the top of the fixing member to form a limiting ring, and the upper surface of the limiting ring is in contact with the lower surface of the mounting ring.

[0016] In one embodiment, the diameter of the first stud segment is smaller than the aperture of the second insertion hole, and a deformation space is formed between the ring side surface of the first stud segment and the inner surface of the second insertion hole.

[0017] In one of the embodiments, the mounting ring is welded to the mounting opening of the bottom box, or the mounting ring and the bottom box are integrally formed.

[0018] The utility model also discloses a sealing and waterproof structure for encapsulating a charging module of a charging device, comprising:

[0019] A bottom box, wherein a receiving cavity is provided in the bottom box, and an installation opening communicating with the receiving cavity is provided on the upper surface of the bottom box;

[0020] A mounting ring, wherein the mounting ring is arranged at the mounting opening, the outer edge contour of the mounting ring is adapted to the inner contour shape of the mounting opening, the outer ring surface of the mounting ring is fitted with and fixedly connected to the inner surface of the mounting opening, the mounting ring is welded at the mounting opening of the bottom box, or the mounting ring and the bottom box are integrally formed; a plurality of first plug holes are arranged at intervals on the upper surface of the mounting ring, and the projection length of the arrangement positions of two adjacent first plug holes on the annular path of the mounting ring is between 80-100 mm; a plurality of fixing members corresponding to each of the first plug holes and fixedly connected to the mounting ring are arranged below the mounting ring, the top of the fixing member is inserted into the first plug hole and forms a first limiting step in the first plug hole, and a slot connected to the first plug hole is arranged at the top of the fixing member, the ring side surface of the fixing member is raised at the top of the adjacent fixing member to form a limiting ring, and the upper surface of the limiting ring is abutted against the lower surface of the mounting ring; the fixing member is fixed to the mounting ring by riveting or welding, or the fixing member and the mounting ring are integrally formed;

[0021] A sealing ring, the sealing ring is arranged on the upper surface of the mounting ring, and the sealing ring is provided with a plurality of second plug holes corresponding to each other and connected to the first plug holes;

[0022] A cover plate, the cover plate is disposed on the upper surface of the sealing ring, and the cover plate is provided with a plurality of countersunk holes corresponding to each of the second plug holes; and

[0023] A connecting component, the connecting component includes a plurality of step screws corresponding to each of the countersunk holes one by one, the step screw includes a screw head, a first stud section fixedly connected to the lower surface of the screw head, and a second stud section fixedly connected to the lower surface of the first stud section, the diameter of the first stud section is greater than the diameter of the second stud section, and the connecting portion of the first stud section and the second stud section forms a second limiting step, the diameter of the first stud section is between 3-5mm, and the diameter of the second stud section is between 3-4mm; the diameter of the first stud section is smaller than the aperture of the second insertion hole, and a deformation space is formed between the ring side surface of the first stud section and the inner surface of the second insertion hole; the step screw passes through the countersunk hole, the second insertion hole, and the first insertion hole in sequence and is inserted into the slot, the second limiting step abuts against the first limiting step, and the second stud section is threadedly connected to the inner surface of the slot.

[0024] The sealing and waterproof structure of the utility model is implemented by the mutual cooperation of the step screw and the fixing part, and the step height of the step screw is used to limit the compression thickness of the sealing ring, so that the sealing ring is compressed within a resilient compression amount, and the cover plate is locked by the step screws of the same type, so that the compression heights of various parts on the sealing ring are consistent, and the sealing ring is evenly stressed, so that the sealing ring is tightly fitted to the cover plate and the mounting ring respectively, thereby ensuring the waterproof effect of the sealing and waterproof structure, and there is no need to process grooves on the cover plate, the overall structure is simple, and the processing cost of the product is reduced; after the groove is cancelled, the width of the mounting ring as the sealing area of ​​the sealing and waterproof structure can be reduced while meeting the mechanical strength requirements of the cover plate, and the thickness of the cover plate can be reduced, while saving materials and meeting the thickness requirements of product processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a structural schematic diagram of a sealing and waterproof structure in one embodiment of the utility model;

[0026] Figure 2 This is a schematic diagram of the explosion structure of the sealing and waterproof structure in one embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of the partial cross-sectional structure of the sealing and waterproof structure in one embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0029] Please combine Figure 1-3The utility model discloses a sealing waterproof structure with low processing cost, small cover plate thickness and narrow sealing area width, which is used to encapsulate the charging module of the charging device and realize waterproof protection of the charging module. Specifically, the sealing waterproof structure includes a bottom box 100, a mounting ring 200, a sealing ring 300, a cover plate 400 and a connecting assembly. When the sealing waterproof structure is assembled, the cover plate 400 is covered on the bottom box 100, so as to encapsulate the charging module in the accommodating cavity together with the bottom box 100; the sealing ring 300 is arranged at the connection part between the bottom box 100 and the cover plate 400, and is used to block the gap at the connection between the bottom box 100 and the cover plate 400, so as to realize waterproof protection of the charging module; the mounting ring 200 is used to provide a receiving part of the cover plate 400 on the one hand, so as to increase the matching area between the cover plate 400 and the bottom box 100, and on the other hand, the mounting ring 200 is also used to provide an installation position for the sealing ring 300.

[0030] The bottom box 100 is provided with a receiving cavity, which is used to accommodate the charging module of the charging device. The upper surface of the bottom box 100 is provided with a mounting port 110 connected to the receiving cavity. The mounting ring 200 is arranged at the mounting port 110. The outer edge contour of the mounting ring 200 is adapted to the inner contour shape of the mounting port 110. The outer ring surface of the mounting ring 200 is fitted and fixedly connected to the inner surface of the mounting port 110. A plurality of first plug holes 210 are provided at intervals on the upper surface of the mounting ring 200. The first plug holes 210 penetrate the upper surface and the lower surface of the mounting ring 200. A plurality of fixing members 220 corresponding to each first plug hole 210 and fixedly connected to the mounting ring 200 are provided below the mounting ring 200. The top of the fixing member 220 is inserted into the first plug hole 210 and forms a first limiting step 230 in the first plug hole 210. The top of the fixing member 220 is provided with a slot 221 connected to the first plug hole 210. That is, the insertion depth of the fixing member 220 in the first insertion hole 210 is less than the depth of the first insertion hole 210, so that the top of the fixing member 220 forms a first limiting step 230 in the first insertion hole 210. The sealing ring 300 is arranged on the upper surface of the mounting ring 200, and the sealing ring 300 is provided with a plurality of second insertion holes 310 corresponding to each first insertion hole 210. The cover plate 400 is arranged on the upper surface of the sealing ring 300, and the cover plate 400 is provided with a plurality of countersunk holes 410 corresponding to each second insertion hole 310. The connecting assembly includes a plurality of step screws 500 corresponding to each countersunk hole 410, and the step screw 500 includes a screw head 510, a first stud section 520 fixedly connected to the lower surface of the screw head 510, and a second stud section 530 fixedly connected to the lower surface of the first stud section 520. The upper surface of the screw head 510 is provided with a straight or cross-shaped insertion groove for inserting tools such as a screwdriver. The diameter of the first stud section 520 is greater than the diameter of the second stud section 530, and the connection between the first stud section 520 and the second stud section 530 forms a second limiting step 540. The step screw 500 passes through the countersunk hole 410, the second insertion hole 310, and the first insertion hole 210 in sequence and is inserted into the slot 221. The second limiting step 540 abuts against the first limiting step 230, and the second stud section 530 is threadedly connected to the inner surface of the slot 221. In this way, by limiting the height of the first stud section 520 and the second stud section 530 and the depth of the fixing member 220 inserted into the first insertion hole 210, the compression amount of the sealing ring 300 can be controlled. By selecting the same type of step screws 500, the force at each part of the sealing ring 300 can be uniformly applied, thereby ensuring the reliability of the waterproofness of the sealing ring 300.

[0031] In this embodiment, the bottom box 100 includes a bottom plate 120 and a retaining ring 130 fixed on the upper surface of the bottom plate 120. The bottom plate 120 and the retaining ring 130 together form a receiving cavity of the bottom box 100, and the upper part of the retaining ring 130 forms an installation opening 110 of the bottom box 100. Further, the bottom plate 120 is a rectangular structure, and the four corners of the bottom plate 120 are respectively provided with rounded corners. The outer contour shape of the retaining ring 130 is adapted to the outer edge shape of the bottom plate 120, and the outer edge of the retaining ring 130 is flush with the outer edge of the bottom plate 120, so that the bottom box 100 can be prevented from scratching the operator or user. The bottom plate 120 can be fixed to the retaining ring 130 by welding, and the two can also be formed in one piece.

[0032] The mounting ring 200 is welded at the mounting opening 110 of the bottom box 100, or the mounting ring 200 and the bottom box 100 are integrally formed. The mounting ring 200 includes four straight portions spaced apart in a circular direction, two adjacent straight portions are perpendicular to each other, and the two adjacent straight portions are connected by an arc portion. Furthermore, the projection length of the setting positions of two adjacent first plug holes 210 on the circular path of the mounting ring 200 is between 80-100 mm. That is to say, when two adjacent first plug holes 210 are located on the same straight portion of the mounting ring 200, the projection length of the setting positions of the two adjacent first plug holes 210 on the annular path of the mounting ring 200 is the distance between the two adjacent first plug holes 210; when two adjacent first plug holes 210 are located on the same arc portion of the mounting ring 200, the projection length of the setting positions of the two adjacent first plug holes 210 on the annular path of the mounting ring 200 is the arc length between the two first plug holes 210 on the arc portion; similarly, when one of the two adjacent first plug holes 210 is located on the arc portion , when one is located at the straight part, the projection length of the setting position of the two adjacent first plug holes 210 on the annular path of the mounting ring 200 is the sum of the straight line distance from the connecting part of the arc part and the straight part to one of the first plug holes 210 and the arc length from the connecting part to the other first plug hole 210; when the two adjacent first plug holes 210 are located on the two straight parts at both ends of the same arc part, the projection length of the setting position of the two adjacent first plug holes 210 on the annular path of the mounting ring 200 is the sum of the arc length of the arc part and the straight line distance from both ends of the arc part to the two first plug holes 210. By limiting the projection length of the setting position of the two adjacent first plug holes 210 on the annular path of the mounting ring 200 to between 80-100 mm, it is ensured that the various parts of the sealing ring 300 are subjected to uniform force, and the upper surface of the sealing ring 300 can be completely fitted with the cover plate 400, and at the same time, it is ensured that the lower surface of the sealing ring 300 can be completely fitted with the mounting ring 200.

[0033] In this embodiment, the fixing member 220 is a tubular structure. Depending on the processing technology, the bottom of the fixing member 220 can be either a closed structure or an open structure, that is, the depth of the slot 221 can be less than the height of the fixing member 220, or can be equal to the height of the fixing member 220. In one embodiment, the fixing member 220 is fixed to the mounting ring 200 by riveting or welding. In another embodiment, the fixing member 220 and the mounting ring 200 are integrally formed. In another embodiment, the fixing member 220 is inserted into the first plug hole 210 by interference fit to achieve the fixing of the fixing member 220 on the mounting ring 200. In order to limit the insertion depth of the fixing member 220 in the first insertion hole 210, in one embodiment, the ring side surface of the fixing member 220 is raised adjacent to the top of the fixing member 220 to form a limiting ring 222, and the upper surface of the limiting ring 222 abuts against the lower surface of the mounting ring 200. In this way, through the abutment between the upper surface of the limiting ring 222 and the lower surface of the mounting ring 200, the area on the fixing member 220 limited to the upper part of the limiting ring 222 can be inserted into the first insertion hole 210, thereby achieving the purpose of controlling the insertion depth of the fixing member 220.

[0034] In this embodiment, the shape of the sealing ring 300 is adapted to the shape of the mounting ring 200, and the width of the sealing ring 300 (i.e., the cross-sectional width of the sealing ring 300) is less than or equal to the width of the mounting ring 200 (i.e., the cross-sectional width of the mounting ring 200) to ensure the reliability of the mounting ring 200 supporting the sealing ring 300, and to avoid the sealing ring 300 being partially protruded from the edge of the mounting ring 200, and the protruding part being damaged due to excessive shear force from the cover plate 400 and the mounting ring 200, so as to extend the service life of the sealing ring 300. Further, the sealing ring 300 is made of silicone or rubber material. Preferably, the sealing ring 300 of this embodiment is a silicone sealing ring 300. The outer contour shape of the cover plate 400 is the same as the outer contour shape of the base plate 120, that is, the cover plate 400 is a rectangular structure, and rounded corners are respectively provided at the four corners of the cover plate 400. After the cover plate 400 is covered on the sealing ring 300, the edge of the cover plate 400 is flush with the outer edge of the retaining ring 130, so that the outer surface of the assembled sealing and waterproof structure remains flat.

[0035] In one embodiment, the countersunk hole 410 includes a conical portion penetrating the upper surface of the cover plate 400 and a straight hole portion penetrating the lower surface of the cover plate 400, the inner diameter of the upper portion of the conical portion is greater than the inner diameter of the lower portion of the conical portion, and the lower portion of the conical portion is connected to the upper portion of the straight hole portion, the outer contour of the screw head 510 is adapted to the inner contour of the conical portion, and the diameter of the upper portion of the screw head 510 is greater than the diameter of the first stud section 520, so that when the step screw 500 is inserted, since the upper portion of the countersunk hole 410 is conical and the inner diameter is greater than the diameter of the second stud section 530, it is convenient to quickly position the step screw 500, and after the step screw 500 is locked, the upper surface of the screw head 510 is flush with or lower than the upper surface of the cover plate 400, so as to avoid scratches on people or objects caused by the protrusion of the screw head 510. Further, the diameter of the first stud section 520 is between 3-5 mm, and the diameter of the second stud section 530 is between 3-4 mm. The diameter of the first stud section 520 is smaller than the inner diameter of the first plug hole 210, so as to reduce the difficulty of the first stud section 520 being embedded in the first plug hole 210. Further, the diameter of the first stud section 520 is smaller than the aperture of the second plug hole 310, and the aperture of the second plug hole 310 is larger than the aperture of the first plug hole 210, and a deformation space is formed between the ring side surface of the first stud section 520 and the inner surface of the second plug hole 310. In this way, after the step screw 500 is locked, the cover plate 400 and the mounting ring 200 jointly squeeze the sealing ring 300, so that the sealing ring 300 is deformed. When the sealing ring 300 is compressed, its deformed part is squeezed into the deformation space, thereby filling the gap between the cover plate 400 and the mounting ring 200, so as to achieve the purpose of waterproofing.

[0036] The above-mentioned sealing and waterproof structure, through the mutual cooperation between the step screw 500 and the fixing part 220, uses the step height of the step screw 500 to limit the compression thickness of the sealing ring 300, so that the sealing ring 300 is compressed within a resilient compression amount, and the cover plate 400 is locked by the step screw 500 of the same type, so that the compression height of each part of the sealing ring 300 is consistent, and the sealing ring 300 is evenly stressed, so that the sealing ring 300 is tightly fitted with the cover plate 400 and the mounting ring 200 respectively, thereby ensuring the waterproof effect of the sealing and waterproof structure. It is unnecessary to process a groove on the cover plate 400, and the overall structure is simple, thereby reducing the processing cost of the product. After the groove is cancelled, while meeting the mechanical strength requirements of the cover plate 400, the mounting ring 200, as the sealing area of ​​the sealing and waterproof structure, can have its width reduced, and the thickness of the cover plate 400 can be reduced, thereby saving materials and meeting the thickness requirements of product processing.

[0037] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A sealed waterproof structure for encapsulating a charging module of a charging device, characterized in that: include: A bottom box, wherein a receiving cavity is provided in the bottom box, and an installation opening communicating with the receiving cavity is provided on the upper surface of the bottom box; A mounting ring, wherein the mounting ring is arranged at the mounting opening, the outer edge contour of the mounting ring is adapted to the inner contour shape of the mounting opening, the outer ring surface of the mounting ring is fitted with and fixedly connected to the inner surface of the mounting opening, a plurality of first plug holes are arranged at intervals on the upper surface of the mounting ring, a plurality of fixing members corresponding to the first plug holes and fixedly connected to the mounting ring are arranged below the mounting ring, the top end of the fixing member is inserted into the first plug hole and forms a first limiting step in the first plug hole, and a slot communicating with the first plug hole is arranged on the top of the fixing member; A sealing ring, the sealing ring is arranged on the upper surface of the mounting ring, and the sealing ring is provided with a plurality of second plug holes corresponding to each other and connected to the first plug holes; A cover plate, the cover plate is arranged on the upper surface of the sealing ring, and a plurality of countersunk holes corresponding to each of the second plug holes are formed on the cover plate; as well as A connecting component, the connecting component includes a plurality of step screws corresponding to each of the countersunk holes one by one, the step screw includes a screw head, a first stud section fixedly connected to the lower surface of the screw head, and a second stud section fixedly connected to the lower surface of the first stud section, the diameter of the first stud section is greater than the diameter of the second stud section, and the connecting portion of the first stud section and the second stud section forms a second limiting step, the step screw passes through the countersunk hole, the second insertion hole, and the first insertion hole in sequence and is inserted into the slot, the second limiting step abuts against the first limiting step, and the second stud section is threadedly connected to the inner surface of the slot.

2. The sealing and waterproof structure according to claim 1, characterized in that: The projection length of the arrangement positions of two adjacent first plug holes on the annular path of the installation ring is between 80-100 mm.

3. The sealing and waterproof structure according to claim 1, characterized in that: The diameter of the first stud section is between 3-5 mm, and the diameter of the second stud section is between 3-4 mm.

4. The sealing and waterproof structure according to claim 1, characterized in that: The sealing ring is made of silicone or rubber material.

5. The sealing and waterproof structure according to claim 1, characterized in that: The fixing piece is fixed on the mounting ring by riveting or welding.

6. The sealing and waterproof structure according to claim 1, characterized in that: The fixing member and the mounting ring are integrally formed.

7. The sealing and waterproof structure according to claim 1, characterized in that: The ring side surface of the fixing member is raised adjacent to the top of the fixing member to form a limiting ring, and the upper surface of the limiting ring is in contact with the lower surface of the mounting ring.

8. The sealing and waterproof structure according to claim 1, characterized in that: The diameter of the first stud section is smaller than the aperture of the second insertion hole, and a deformation space is formed between the ring side surface of the first stud section and the inner surface of the second insertion hole.

9. The sealing and waterproof structure according to claim 1, characterized in that: The mounting ring is welded at the mounting opening of the bottom box, or the mounting ring and the bottom box are integrally formed.

10. A sealed waterproof structure for encapsulating a charging module of a charging device, characterized in that: include: A bottom box, wherein a receiving cavity is provided in the bottom box, and an installation opening communicating with the receiving cavity is provided on the upper surface of the bottom box; A mounting ring, wherein the mounting ring is arranged at the mounting opening, the outer edge contour of the mounting ring is adapted to the inner contour shape of the mounting opening, the outer ring surface of the mounting ring is fitted with and fixedly connected to the inner surface of the mounting opening, the mounting ring is welded at the mounting opening of the bottom box, or the mounting ring and the bottom box are integrally formed; a plurality of first plug holes are arranged at intervals on the upper surface of the mounting ring, and the projection length of the arrangement positions of two adjacent first plug holes on the annular path of the mounting ring is between 80-100 mm; a plurality of fixing members corresponding to each of the first plug holes and fixedly connected to the mounting ring are arranged below the mounting ring, the top of the fixing member is inserted into the first plug hole and forms a first limiting step in the first plug hole, and a slot connected to the first plug hole is arranged at the top of the fixing member, the ring side surface of the fixing member is raised at the top of the adjacent fixing member to form a limiting ring, and the upper surface of the limiting ring is abutted against the lower surface of the mounting ring; the fixing member is fixed to the mounting ring by riveting or welding, or the fixing member and the mounting ring are integrally formed; A sealing ring, the sealing ring is arranged on the upper surface of the mounting ring, and the sealing ring is provided with a plurality of second plug holes corresponding to each other and connected to the first plug holes; A cover plate, the cover plate is arranged on the upper surface of the sealing ring, and a plurality of countersunk holes corresponding to each of the second plug holes are formed on the cover plate; as well as A connecting component, the connecting component includes a plurality of step screws corresponding to each of the countersunk holes one by one, the step screw includes a screw head, a first stud section fixedly connected to the lower surface of the screw head, and a second stud section fixedly connected to the lower surface of the first stud section, the diameter of the first stud section is greater than the diameter of the second stud section, and the connecting portion of the first stud section and the second stud section forms a second limiting step, the diameter of the first stud section is between 3-5mm, and the diameter of the second stud section is between 3-4mm; the diameter of the first stud section is smaller than the aperture of the second insertion hole, and a deformation space is formed between the ring side surface of the first stud section and the inner surface of the second insertion hole; the step screw passes through the countersunk hole, the second insertion hole, and the first insertion hole in sequence and is inserted into the slot, the second limiting step abuts against the first limiting step, and the second stud section is threadedly connected to the inner surface of the slot.

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