CN111132489A

CN111132489A - Column top waterproof sealing structure and antenna

Info

Publication number: CN111132489A
Application number: CN201911346948.1A
Authority: CN
Inventors: 洪姣
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-12-24
Filing date: 2019-12-24
Publication date: 2020-05-08

Abstract

The invention discloses a waterproof sealing structure for the top of a columnar object, which comprises a shell and a top cover, wherein the shell is columnar, the lower end of the shell is open, the upper end of the shell is provided with a sealing surface, the center of the sealing surface is provided with an opening, the top cover is matched with the opening, the sealing surface is provided with an extending part which protrudes downwards at the opening, the extending part is hollow and penetrates up and down, the radial section of an inner cavity of the extending part is the same as the opening, the side wall of the top cover is bonded with the inner wall of the opening through a first waterproof glue layer, the edge of the lower end of the top cover is provided with a second waterproof glue layer, the second waterproof glue layer is arranged below the top cover. The waterproof sealing structure for the top of the columnar object and the antenna provided by the invention can ensure that the wall thickness of the columnar shell is uniform, the waterproof performance of the sealing end is good, the influence on the internal parts of the shell is avoided, the production is convenient, and the production cost is low.

Description

Column top waterproof sealing structure and antenna

Technical Field

The invention relates to the field of column products, in particular to a waterproof sealing structure at the top of a column and an antenna.

Background

The columnar shell is applied to a plurality of products, one end of the columnar shell is open and used for placing an object in the shell, the other end of the columnar shell is required to be sealed so as to achieve the effects of water prevention and the like, the wall thickness of the columnar shell is required to be uniform in the production process of the product, the columnar shell has high requirements on product precision particularly in the fields of aerospace, electronic equipment and the like, and the uniformity of the wall thickness of the shell has great influence on the product precision.

The existing production of the columnar shell mostly adopts an injection molding and integral molding method. In the process of injection molding, if one end of a formed cylindrical shell is closed, only one end of a mold core/mold core for manufacturing the shell can be fixed, in the process of injection molding, the mold core/mold core can be deflected by the pressure of ejected liquid plastic, so that the mold core/mold core is inclined, the inner wall and the outer wall of the produced and formed cylindrical shell cannot meet the same axis, the wall thickness of the cylindrical shell is uneven, the cylindrical shell is more thin and more prone to being inclined and not coaxial, therefore, when the cylindrical shell is produced, two ends of a product need to be opened, two ends of the mold core/mold core are fixed, the phenomenon that the shell is inclined due to the pressure of the liquid plastic in the process of injection molding is avoided, and after the shell is produced, an adaptive top cover is configured to seal one end of the shell.

The existing shell top sealing structure mainly adopts the following two types:

firstly, as shown in fig. 1, the top of the housing 1 is directly opened with 2, and the top cover 3 is configured to fit with the opening 2, when the housing 1 is sealed with the top cover 3, a layer of waterproof glue is applied to the opening 2, then the top cover 3 is pressed into the opening 2, the top cover 3 and the housing 1 are bonded by the waterproof glue, and the design mainly has the following disadvantages: 1. the shell 1 and the top cover 3 are bonded through only one circle of the side wall of the top cover 3, the bonding force is small, and the falling is easy; 2. in the process of pressing the top cover 3 into the opening 2, excessive waterproof glue on the side wall of the opening 2 is too much, redundant waterproof glue can be extruded to flow into the shell 1, influence on components in the shell 1 can be caused, the waterproof glue is too little, bonding is not stable, and the waterproof effect is not good; 3. the bonding surface of the shell 1 and the top cover 3 is small, and gaps are easily generated at the bonding part of the shell 1 and the top cover 3, so that the risk of water leakage exists.

Secondly, as shown in fig. 2, for increasing the waterproof performance and the binding force that top cap 3 and casing 1 bonded, at 1 top opening 2 department of casing design step 4, set up with step 4 complex top cap 3, the rethread waterproof glue bonds top cap 3 on the step 4 at 1 top of casing, the main shortcoming that exists of this kind of design is: the mold for injection molding needs to be redesigned, the mold cost is increased, and the demolding must be performed from both ends after the injection molding is completed, which complicates the demolding procedure.

Disclosure of Invention

The invention aims to provide a waterproof sealing structure for the top of a columnar object and an antenna, which can ensure that the wall thickness of a columnar shell is uniform, the waterproof performance of a sealing end is good, the influence on internal parts of the shell is avoided, the production is convenient, and the production cost is low.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

the invention discloses a waterproof sealing structure at the top of a column, which comprises a shell and a top cover, wherein the shell is columnar, the lower end of the shell is open, the upper end of the shell is provided with a sealing surface, the center of the sealing surface is provided with an opening, the top cover is matched with the opening, the sealing surface is provided with an extension part which protrudes downwards at the opening, the distance from the lower end of the extension part to the upper end of the sealing surface is larger than the thickness of the top cover, the extension part is hollow and penetrates through the top cover and the bottom cover, the radial section of the inner cavity of the extension part is the same as that of the opening, the inner wall of the upper end of the extension part is attached to the edge of the opening, the side wall of the top cover is bonded with the inner wall of the opening through a first waterproof adhesive layer, the edge of the lower end of the top cover is provided with a second waterproof adhesive layer, the second waterproof glue layer is arranged below the top cover, and the second waterproof glue layer is arranged in the extending part.

The invention has the beneficial effects that: when the top cover is used for sealing the opening at the upper end of the shell, waterproof glue is smeared on the inner wall of the opening and the inner wall of the extension part, then the top cover is pressed into the opening from top to bottom, in the process of pressing the top cover, partial waterproof glue is pressed into the extension part by the lower end of the top cover, the inner cavity of the extension part between the lower end of the top cover and the lower end of the extension part is a glue cavity for accommodating redundant waterproof glue, after the waterproof glue is condensed, a first waterproof glue layer between the side wall of the top cover and the inner wall of the opening and a second waterproof glue layer in the glue cavity below the top cover are formed, the top cover is firmly bonded with the inner wall of the opening and the inner wall of the extension part, besides the first waterproof glue layer between the side wall of the top cover and the opening, the edge of the lower end of the top cover is also provided with the second waterproof glue layer, the waterproof effect, the uniform wall thickness of the columnar shell can be ensured, and after the injection molding is finished, the demolding is only needed to be carried out from one end, the mold does not need to be redesigned, the production is convenient, and the production cost is low.

Further, the upper end of the top cover is flush with the upper end of the sealing surface.

The beneficial effect of adopting the further scheme is that: the side wall of the top cover is bonded with the side wall of the opening and the inner wall of the extension part as much as possible, so that the bonding surface is increased, and the bonding force and the waterproof effect after bonding are improved.

Further, a connecting line of the opening center and the opening center is coincident with the axis of the shell.

The beneficial effect of adopting the further scheme is that: when the shell is manufactured, the die core/the die core is more firmly fixed, the sprayed liquid plastic cannot incline, and the wall thickness of the produced shell is uniform.

Further, the extension part is cylindrical.

The beneficial effect of adopting the further scheme is that: the die is simple and convenient to manufacture.

Furthermore, the extension part is frustum-shaped, and the big head end of the extension part is fixedly connected with the sealing surface.

The beneficial effect of adopting the further scheme is that: the material for manufacturing the shell is saved.

Further, the surfaces of the inner wall of the opening and the side wall of the top cover are rough.

The beneficial effect of adopting the further scheme is that: the bonding force of the top cover and the shell can be improved.

The antenna disclosed by the invention comprises an antenna coil and the waterproof sealing structure at the top of the column, wherein the antenna coil is coaxially arranged on the surface of the shell.

The beneficial effect of adopting the further scheme is that: the wall thickness of the produced columnar shell can be ensured to be uniform, the waterproof performance of the upper end of the shell is good, the influence of internal parts of the shell is small, the production is convenient, and the production cost is low.

Further, still include the PCB board, the PCB board set up in the casing lower extreme open department, the PCB board with the antenna coil electricity is connected.

The beneficial effect of adopting the further scheme is that: the radiation performance index of the antenna is convenient to test.

Further, the lower extreme of casing has the mounting groove, the mounting groove with PCB board adaptation, the PCB board is installed in the mounting groove, the degree of depth of mounting groove is more than or equal to the thickness of PCB board.

The beneficial effect of adopting the further scheme is that: the PCB board is convenient to mount, and the mounting position of the PCB board is limited.

Further, a protective layer covers the antenna coil.

The beneficial effect of adopting the further scheme is that: the antenna coil can be protected, and the service life of the antenna coil is prolonged.

Drawings

FIG. 1 is a schematic view of a first prior art waterproof and sealing structure for the top of a column;

FIG. 2 is a schematic view of a second prior art waterproof and sealing structure for the top of a column;

FIG. 3 is a schematic view of a waterproof and sealing structure on the top of a column with a columnar extension part according to the present disclosure;

FIG. 4 is a schematic view of a waterproof and sealing structure on the top of a pillar with a frustum-shaped extension part according to the present disclosure;

FIG. 5 is a schematic view of a housing with a cylindrical extension;

FIG. 6 is a schematic view of a housing with an extension portion in the shape of a frustum;

FIG. 7 is one of the schematic diagrams of an embodiment of the disclosed antenna;

FIG. 8 is a second schematic diagram of an embodiment of an antenna according to the present disclosure;

in the figure: 1. a housing; 11. mounting grooves; 12. opening the mouth; 13. a sealing surface; 2. an opening; 3. a top cover; 4. a step; 5. an extension portion; 51. a glue cavity; 61. a first waterproof glue layer; 62. a second waterproof glue layer; 7. an antenna coil; 8. a PCB board;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.

As shown in fig. 3-6, the embodiment of the top waterproof sealing structure of the column object disclosed by the present invention comprises a shell 1 and a top cover 3, wherein the shell 1 is in a column shape, the lower end of the shell 1 is provided with an opening 12, the upper end of the shell 1 is provided with a sealing surface 13, the center of the sealing surface 13 is provided with an opening 2, the connecting line of the center of the opening 2 and the center of the opening 12 coincides with the axis of the shell 1, the top cover 3 is adapted to the opening 2, the sealing surface 13 is provided with an extension part 5 protruding downwards at the opening 2, the extension part 5 can be in a column shape, a cylinder or a polygon, the extension part 5 can also be in a frustum shape, a circular truncated cone or a square table, when the extension part 5 is in a frustum shape, the big end of the extension part is fixedly connected with the sealing surface 13, the axis of the extension part 5 coincides with the axis of the shell 1, the distance from the lower, the inner wall of the upper end of extension 5 is laminated with the edge of opening 2, the side wall of top cover 3 is bonded with the inner wall of opening 2 through first waterproof glue layer 61, the upper end of top cover 3 flushes with the upper end of sealing face 13, the edge of the lower end of top cover 3 has second waterproof glue layer 62, second waterproof glue layer 62 is in top cover 3 below, second waterproof glue layer 62 is in extension 5.

The housing 1 may be cylindrical or polygonal, the opening 2 may be square or circular, the top cover 3 and the opening 2 are square or circular, the thickness of the top cover 3 is preferably the same as the thickness of the sealing surface 13, the distance from the lower end of the extension portion 5 to the upper end of the sealing surface 13 is twice the thickness of the top cover 3, for example, when the thickness of the top cover 3 and the sealing surface 13 is 1mm, the distance from the lower end of the extension portion 5 to the upper end of the sealing surface 13 is 2mm, and the extension portion 5 and the housing 1 are integrally formed.

After the shaping of casing 1, scribble the marine glue at opening 2's inner wall, with top cap 3 from top to bottom pressing in opening 2 department, make top cap 3 upper end flush with sealed cap end, top cap 3 scrapes partial marine glue down and presses into the 5 inner chambers of extension of top cap 3 below, 5 inner chambers of extension between extension 5 lower extreme and the 3 lower extremes of top cap are gluey chamber 51, unnecessary marine glue holds here and glues in chamber 51, marine glue forms first marine glue layer 61 between top cap 3 lateral wall and opening 2 inner walls, form second marine glue layer 62 in gluey chamber 51, the edge of second marine glue layer 62 bonding top cap 3 lower extreme, improve top cap 3's adhesion strength and waterproof ability.

The opening 2 and the top cover 3 can be matched, connected and fixed with the first waterproof glue layer 61 in a tight fit mode through the structural size, in order to reduce the manufacturing workload, the side walls of the opening 2 and the top cover 3 are smooth or rough, in order to improve the binding force between the opening 2 and the top cover 3 and the first waterproof glue layer 61, the surfaces of the inner wall of the opening 2 and the side wall of the top cover 3 can be rough, the top cover 3 is fixed at a preset position after being tightly fitted at the opening 2, on one hand, the top cover 3 can extrude the waterproof glue into all tiny gaps between the top cover 3 and the opening 2, on the other hand, the redundant waterproof glue is extruded into the glue cavity 51 to form the second waterproof glue layer 62, when the waterproof glue is coated, the waterproof glue amount is controlled, the second waterproof glue layer 62 is controlled in the extension part 5 to enable the waterproof glue not to flow over the lower end of the extension part 5, the second waterproof glue layer 62 can fill the whole glue cavity 51, and, the bonding and waterproof effects are better.

As shown in fig. 7 and 8, the embodiment of the antenna disclosed by the invention comprises an antenna coil 7 and the waterproof sealing structure at the top of the column, wherein the antenna coil 7 is coaxially arranged on the surface of the shell 1, the antenna further comprises a PCB 8, the PCB 8 is arranged at an opening 12 at the lower end of the shell 1, the PCB 8 is electrically connected with the antenna coil 7, the lower end of the shell 1 is provided with a mounting groove 11, the mounting groove 11 is matched with the PCB 8, the PCB 8 is arranged in the mounting groove 11, the depth of the mounting groove 11 is greater than or equal to the thickness of the PCB 8, and a protective layer covers the antenna coil 7.

Casing 1 link up from top to bottom, and casing 1 is that the center of end opening 2 and the center of the uncovered 12 of lower extreme are all on casing 1's axis, and when being convenient for when laser radium carving antenna coil 7, the upper end and the lower extreme of fixed casing 1 simultaneously make casing 1's upper end and lower extreme coaxial rotation, when reducing the single-end fixed, the other end is because the deviation that centrifugal force produced, and top cap 3 seals casing 1 upper end, and waterproof performance is good, and top cap 3 bonds firmly.

The processing method of the antenna comprises the following steps:

processing the shell 1: processing a shell 1 which is through before and after and has two ends with openings 2 with the centers on the axis of the shell 1;

fixing the housing 1: fixing a rotating body, the upper end and the lower end of which are the same as a rotating shaft, of the shell 1;

the rotating body can adopt a long jig which can penetrate through the upper end and the lower end of the shell 1, and different positions of the long jig are respectively fixed with the upper end and the lower end of the shell 1; the rotator also can adopt the coaxial short tool of root, and 2 short tools are fixed with the upper end and the lower extreme of casing 1 respectively.

Laser etching antenna coil 7: the rotating body is rotated to synchronously drive the upper end and the lower end of the shell 1 to coaxially rotate, so that the upper end and the lower end of the shell 1 are prevented from eccentrically moving in the rotating process, the antenna coil 7 is irradiated to the outer side of the shell 1 through laser irradiation, and the shell 1 rotates for a circle for 2-5 seconds, preferably 3 seconds;

sealing the upper end of the housing 1: after the antenna coil 7 is laser-etched to the outer side of the shell 1, waterproof glue is coated on the inner wall of the opening 2, the top cover 3 is covered in the opening 2 of the shell 1, the opening 2 is sealed by the top cover 3, a first waterproof glue layer 61 is formed between the inner wall of the opening 2 and the side wall of the top cover 3, and a second waterproof glue layer 62 is formed in a cavity between the lower end of the top cover 3 and the lower end of the extension part 5 through pressing the redundant waterproof glue on the inner wall of the opening 2.

After the antenna coil 7 is etched, the method further comprises the following steps: and (3) adding a protective film, wherein the protective film is added on the surface of the antenna coil 7 subjected to laser etching by adopting a chemical plating or spraying method, and when the protective film is added, the protective film is preferably added on both the outer surface of the shell 1 and the antenna coil 7, so that the processing is convenient.

And (3) welding the PCB (printed circuit board) 8: after being electrically connected with the antenna coil 7, the PCB 8 is placed in the mounting groove 11, the PCB 8 is fixedly connected with the shell 1 through welding, and the PCB 8 can test and verify the radiation performance index of the whole antenna.

Laser carving antenna coil 7 adopts LDS laser radium-shine, through fixed laser, the radium-carving is realized to rotatory casing 1, and the current antenna coil 7 of single-ended fixed casing 1 processing because the effect of distal end centrifugal force, the precision is about 1mm after antenna coil 7 processing is accomplished, and the antenna coil 7 through above-mentioned method processing, the precision is at 0.05 mm.

When the single end of the shell 1 is fixed, the far end can shake under the action of centrifugal force, and the shell 1 needs 10 seconds to rotate for one circle.

The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.

Claims

1. The utility model provides a column top waterproof sealing structure which characterized in that: the sealing structure comprises a shell (1) and a top cover (3), wherein the shell (1) is columnar, the lower end of the shell (1) is open (12), a sealing surface (13) is arranged at the upper end of the shell (1), an opening (2) is formed in the center of the sealing surface (13), the top cover (3) is matched with the opening (2), an extending part (5) protrudes downwards from the opening (2) of the sealing surface (13), the distance from the lower end of the extending part (5) to the upper end of the sealing surface (13) is greater than the thickness of the top cover (3), the extending part (5) is hollow and penetrates through the top and the bottom, the radial cross section of the inner cavity of the extending part (5) is the same as that of the opening (2), the inner wall of the upper end of the extending part (5) is attached to the edge of the opening (2), and the side wall of the top cover (3) is attached to the inner wall of the, the edge of the lower end of the top cover (3) is provided with a second waterproof glue layer (62), the second waterproof glue layer (62) is arranged below the top cover (3), and the second waterproof glue layer (62) is arranged in the extension part (5).

2. The column roof waterproof and sealing structure according to claim 1, wherein: and a connecting line of the center of the opening (2) and the center of the opening (12) is superposed with the axis of the shell (1).

3. The column roof waterproof and sealing structure according to claim 1 or 2, characterized in that: the upper end of the top cover (3) is flush with the upper end of the sealing surface (13).

4. The column roof waterproof and sealing structure according to claim 1 or 2, characterized in that: the extension part (5) is columnar.

5. The column roof waterproof and sealing structure according to claim 1 or 2, characterized in that: the extension part (5) is frustum-shaped, and the large head end of the extension part (5) is fixedly connected with the sealing surface (13).

6. The column roof waterproof and sealing structure according to claim 1 or 2, characterized in that: the surfaces of the inner wall of the opening (2) and the side wall of the top cover (3) are rough.

7. An antenna, characterized by: comprising an antenna coil (7) and a column roof watertight seal as claimed in any one of claims 1 to 6, said antenna coil (7) being coaxially arranged on the surface of said housing (1).

8. The antenna of claim 7, wherein: still include PCB board (8), PCB board (8) set up in casing (1) lower extreme uncovered (12) department, PCB board (8) with antenna coil (7) electricity is connected.

9. The antenna of claim 8, wherein: the lower extreme of casing (1) has mounting groove (11), mounting groove (11) with PCB board (8) adaptation, install PCB board (8) in mounting groove (11), the degree of depth of mounting groove (11) is more than or equal to the thickness of PCB board (8).

10. The antenna of claim 7, wherein: and a protective layer covers the antenna coil (7).