CN112297438A

CN112297438A - Cylindrical plastic shell with built-in wide ribs and welding method thereof

Info

Publication number: CN112297438A
Application number: CN202011410852.XA
Authority: CN
Inventors: 于晓东; 王传洋; 龙庆; 陈烨
Original assignee: Suzhou University
Current assignee: Suzhou University
Priority date: 2020-07-28
Filing date: 2020-12-04
Publication date: 2021-02-02
Also published as: WO2022021763A1; WO2022021877A1; CN111805915A

Abstract

The invention discloses a cylindrical plastic shell with a built-in wide rib, which comprises a plastic shell, a shape control mechanism and a laser, wherein the plastic shell comprises a hollow cylinder, at least one wide rib and at least one groove arranged on the inner wall of the cylinder, the edge of the at least one wide rib is placed in the at least one groove, the shape control mechanism comprises at least one shape control sleeve part, and the at least one shape control sleeve part is sleeved on the periphery of the cylinder and is arranged corresponding to the at least one wide rib. The invention also discloses a welding method of the cylindrical plastic shell with the built-in wide ribs. According to the invention, the wide ribs increase the stress points in the axial direction of the cylinder, and create possibility for adding parts or structural features in the cylinder; the requirement on the transmittance of the cylinder material is eliminated, and the deformation of the surface of the cylinder caused by heat input in the welding process is reduced; the clamp-free welding of the wide ribs can be realized; the gap between the trapezoidal bulge and the groove can store flash formed by thermal expansion of materials in the welding process, so that deformation of the cylinder is avoided.

Description

Cylindrical plastic shell with built-in wide ribs and welding method thereof

Technical Field

The invention relates to the technical field of laser transmission welding, in particular to a cylindrical plastic shell with a built-in wide rib and a welding method thereof.

Background

In the field of household appliances at present, such as air conditioners and electric water heaters, shells of the appliances are mostly made of metal materials. Plastic housings have attracted attention because of their advantages of low cost, corrosion resistance, and various surface treatments. However, in practical applications, core components of the electrical appliance, such as the inner container of the water heater, the electrical appliance chamber, the air outlet of the air conditioner, and the like, need to be connected to the housing, and it is difficult to achieve seamless connection between the end cap and the housing. The traditional injection molding and extrusion molding process is difficult to directly mold the connecting structure on the plastic shell.

The invention patent with the application number of CN201910876335.2 discloses a water heater shell and a water heater, wherein the water heater shell comprises a shell, guide grooves are arranged on two sides of the shell, and a closing-up piece with a boss characteristic is matched with the guide grooves, so that the problem of flash seams between the shell and an end cover is solved. However, the clamping structure of the closing part and the shell causes the inevitable step characteristics at the two ends of the shell, thereby reducing the aesthetic level.

The invention patent with the application number of CN201910876341.8 discloses a water heater shell and a water heater, which comprise a barrel body, wherein the barrel body is connected with an end cover through an arc-shaped buckle, and the connection mode between the arc-shaped buckle and the barrel body is not mentioned. And the arc buckle has the characteristics of circumference distribution, is difficult to guarantee the sealed effect between staving and the end cover.

The invention patent with application number CN201210309223.7 discloses a vertical air conditioner, which comprises an air guiding component and a casing, wherein the air guiding component and the casing are in a split structure, but the specific positioning mode of the air guiding component is not mentioned.

The mechanical connection method makes it difficult to connect the housing to other components due to the lack of force points. The adhesive bonding generally has the problems of poor stability and complex process. The T-shaped laser transmission welding needs to realize that laser beams penetrate through the cylinder, and the material of the cylinder has the requirement on light transmittance.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a cylindrical plastic shell with a built-in wide rib and a welding method thereof.

In order to achieve the above object, an embodiment of the present invention provides the following technical solutions:

the utility model provides a cylindric plastic casing of built-in wide rib, includes plastic casing, accuse shape mechanism and laser instrument, the plastic casing includes hollow drum, at least one wide rib and sets up at least one recess on the drum inner wall, the edge of at least one wide rib is put into in the at least one recess, accuse shape mechanism includes at least one accuse shape external member, at least one accuse shape external member cover is established the periphery of drum and with at least one wide rib corresponds the setting.

As a further improvement of the present invention, the wide rib includes two semi-annular ribs, each of the semi-annular ribs includes a semi-annular rib body, at least one mounting hole provided on the semi-annular rib body, and at least one pylon.

As a further improvement of the invention, the cross section of the groove is trapezoidal, and the edge of the semi-annular rib body is a trapezoidal bulge.

As a further improvement of the invention, the inner diameter of the cylinder is equal to the starting diameter of the trapezoidal projection.

As a further improvement of the invention, a gap is arranged between the trapezoidal bulge and the groove.

As a further improvement of the present invention, the semi-ring rib body is provided with a first notch and a second notch, and the at least one mounting hole and the at least one pillar stand are respectively disposed at the first notch and the second notch.

As a further improvement of the present invention, the shape control kit includes a first shape control sleeve and a second shape control sleeve, the first shape control sleeve includes a first arc-shaped shell, and an electromagnetic relay and a first sliding block respectively disposed at the upper end and the lower end of the first arc-shaped shell, and the second shape control sleeve includes a second arc-shaped shell, and a square block and a second sliding block respectively disposed at the upper end and the lower end of the second arc-shaped shell.

As a further improvement of the present invention, the shape control mechanism further includes a welding table, at least one moving element, and a first slide rail, a second slide rail, and a third slide rail that are disposed on the welding table, the moving element includes a first cross beam, a second cross beam, a third slide block that connects the first cross beam and the second cross beam, and a fourth slide block and a fifth slide block that are disposed at a free end of the first cross beam and a free end of the second cross beam, respectively, and the third slide block, the fourth slide block, and the fifth slide block move along the first slide rail, the second slide rail, and the third slide rail, respectively.

As a further improvement of the invention, the contact part of the trapezoidal bulge and the groove forms a welding surface, and an included angle between a laser beam emitted by the laser and the welding surface is 90 degrees.

A welding method of a cylindrical plastic shell with built-in wide ribs, which uses the cylindrical plastic shell with the built-in wide ribs, comprises the following steps:

(1) loading at least one wide rib into the cylinder such that an edge of the at least one wide rib fits within the at least one groove of the cylinder;

(2) sleeving at least one shape control sleeve on the periphery of the cylinder and arranging the shape control sleeve corresponding to at least one wide rib;

(3) and adjusting the laser to complete the welding of the cylinder and the at least one wide rib.

The invention has the beneficial effects that:

(1) according to the invention, the wide ribs are arranged in the cylinder, so that stress points in the axial direction of the cylinder are increased, the possibility of adding components or structural features in the cylinder is created, the components placed in the cylinder are supported through the wide ribs, and the cylinder is suitable for household appliances and industrial products with internal structural features and has a wide application range.

(2) Compared with the traditional laser T-shaped welding, the laser transmission welding of the welding surface formed by matching the trapezoid groove in the cylinder and the trapezoid protrusion at the edge of the wide rib eliminates the requirement on the transmittance of the cylinder material, adjusts the size of the outer diameter and the diameter of the groove of the cylinder according to the actual processing condition, and reduces the deformation of the surface of the cylinder caused by the input heat in the welding process.

(3) The design of the semi-ring rib can realize the clamp-free welding of the wide rib, and the contact state of the wide rib and the cylinder is changed by adjusting the initial diameter of the trapezoidal bulge of the wide rib and the inner diameter of the cylinder, so that the clamp-free welding of the plastic shell is realized.

(4) The gap between the trapezoidal bulge and the groove can store flash formed by thermal expansion of materials in the welding process, and the local deformation caused by extrusion of the flash on the cylinder is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of a preferred embodiment of the present invention;

FIG. 3 is a schematic structural view of a wide rib of a preferred embodiment of the present invention;

FIG. 4 is a schematic structural view of a semi-annular rib of a preferred embodiment of the present invention;

FIG. 5 is an enlarged view of part A of FIG. 2;

FIG. 6 is another enlarged partial view of A in FIG. 2;

FIG. 7 is a schematic illustration of the laser action at the first weld face of the preferred embodiment of the present invention;

FIG. 8 is a schematic illustration of the laser action at the second weld face of the preferred embodiment of the present invention;

FIG. 9 is a schematic structural view of a shape control mechanism of the preferred embodiment of the present invention;

FIG. 10 is a front view of the first shape control sleeve folded with the second shape control sleeve in accordance with the preferred embodiment of the present invention;

FIG. 11 is a side view of a first shape control sleeve of the preferred embodiment of the present invention;

FIG. 12 is a side view of a second shape control sleeve of the preferred embodiment of the present invention;

fig. 13 is a schematic structural view of a mover according to a preferred embodiment of the present invention;

in the figure: 1. the laser welding device comprises a plastic shell, 11, a cylinder, 12, a wide rib, 13, a groove, 14, a semi-ring rib, 141, a semi-ring rib body, 142, a mounting hole, 143, a pillar stand, 144, a trapezoidal protrusion, 145, a first notch, 146, a second notch, 2, a laser, 21, a first laser beam, 22, a second laser beam, 3, a shape control sleeve, 31, a first shape control sleeve, 311, a first arc-shaped shell, 312, an electromagnetic relay, 313, a first sliding block, 32, a second shape control sleeve, 321, a second arc-shaped shell, 322, a square block, 323, a second sliding block, 4, a welding workbench, 41, a first sliding rail, 42, a second sliding rail, 43, a third sliding rail, 5, a moving part, 51, a first beam, 52, a second beam, 53, a third sliding block, 54, a fourth sliding block, 55 and a fifth sliding block.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, 2, and 5, a cylindrical plastic housing with a built-in wide rib includes a plastic housing 1, a shape control mechanism, and a laser 2, where the plastic housing 1 includes a hollow cylinder 11, at least one wide rib 12, and at least one groove 13 disposed on an inner wall of the cylinder 11, an edge of the at least one wide rib 12 is disposed in the at least one groove 13, and the wide rib 12 increases a force-bearing point in an axial direction of the plastic housing 1, has a function of bearing and mounting a component, and can be subsequently processed according to actual needs, creating a possibility of adding a component or a structural feature inside the plastic housing 1, and the shape control mechanism includes at least one shape control kit 3, and the at least one shape control kit 3 is disposed on an outer periphery of the cylinder 11 and corresponds to the at least one wide rib 12. The wide ribs 12 are preferably made of a plastic material having good light transmission and mechanical strength.

As shown in fig. 3 and 4, the wide rib 12 includes two half-ring ribs 14, and each half-ring rib 14 includes a half-ring rib body 141, at least one mounting hole 142 provided on the half-ring rib body 141, and at least one pillar base 143.

Preferably, the cross section of the groove 13 is trapezoidal, the edge of the semi-circular rib body 141 is a trapezoidal protrusion 144, the requirement on the transmittance of the material of the cylinder 11 is eliminated by laser transmission welding of the welding surface formed by matching the trapezoidal groove 13 and the trapezoidal protrusion 144, the size of the outer diameter D0 of the cylinder 11 and the diameter D1 of the groove 13 can be adjusted according to the actual processing condition, and the surface deformation of the cylinder 11 caused by heat input in the welding process is reduced. The included angle between the inclined plane of the groove 13 and the horizontal plane is a, the included angle between the inclined plane of the trapezoidal protrusion 144 and the horizontal plane is b, and the size of the included angle a and the included angle b is required according to the outer diameter D of the cylinder 11₀And the distance L between the groove 13 and the opening end of the cylinder 11 is determined, so that the laser beam emitted by the laser 2 is vertical to the welding surface, and the thermal deformation of the cylinder 11 is minimum in the welding process. The preferred included angle a is equal to the included angle b, so that the complexity of the welding process is reduced, and the relative position of the laser 2 is prevented from being adjusted repeatedly. Preferably, the included angles a and b are both 45 +/-15 degrees.

According to the invention, the inner diameter D2 of the cylinder 11 is preferably equal to the initial diameter D3 of the trapezoidal protrusion 144, the wide rib 12 is normally contacted with the cylinder 11, the normal positioning of the wide rib 12 and the cylinder 11 is realized without a clamp, the welding of the wide rib 12 is completed, the clamping process is removed in the welding process, and the welding efficiency can be improved at one time.

As shown in fig. 5-7, the outer diameter D4 of the wide rib 12 is smaller than the diameter D1 of the groove 13, and a gap δ is provided between the trapezoidal protrusion 144 and the groove 13, which can store flash formed by thermal expansion of the material during welding, reduce local deformation caused by extrusion of the flash on the plastic housing 1, and ensure the shape of the plastic housing 1.

In order to improve the stability of the connection between the two half-ring ribs 14, the half-ring rib body 141 is preferably provided with a first notch 145 and a second notch 146, and the at least one mounting hole 142 and the at least one pillar base 143 are respectively arranged at the first notch 145 and the second notch 146. In the present invention, preferably, the number of the mounting holes 142 and the pylons 143 on each half-ring rib body 141 is two, and two mounting holes 142 and two pylons 143 are disposed at the first notch 145 and the second notch 146. It is understood that two pylons 143 and two mounting holes 142 may be provided at the first notch 145, or one mounting hole 142 and one pylon 143 may be provided at the first notch 145 and one pylon 143 and one mounting hole 142 may be provided at the second notch 146.

As shown in fig. 8 and 9, in the present invention, it is preferable that the contact position of the trapezoidal protrusion 144 and the groove 13 forms a welding surface, and the angle between the laser beam emitted from the laser 2 and the welding surface is 90 °. Further preferred face of weld includes first face of weld M, second face of weld N, and first face of weld M, second face of weld N are the symmetric distribution, and the contained angle c between first face of weld M and the first laser beam 21 is 90, and the contained angle d between second face of weld N and the second laser beam 22 is 90 degrees.

As shown in fig. 9-12, the shape control kit 3 includes a first shape control sleeve 31 and a second shape control sleeve 32, the first shape control sleeve 31 includes a first arc-shaped housing 311, and an electromagnetic relay 312 and a first sliding block 313 respectively disposed at the upper end and the lower end of the first arc-shaped housing 311, the second shape control sleeve 32 includes a second arc-shaped housing 321, and a square block 322 and a second sliding block 323 respectively disposed at the upper end and the lower end of the second arc-shaped housing 321, when the first arc-shaped housing 311 and the second arc-shaped housing 321 are folded, the electromagnetic relay 312 is energized to form a stable connection with the square block 323. The first arc-shaped housing 311 and the second arc-shaped housing 321 preferably have the same structure.

As shown in fig. 9 and 13, the shape control mechanism of the present invention preferably further includes a welding table 4, at least one moving element 5, and a first slide rail 41, a second slide rail 42, and a third slide rail 43 disposed on the welding table 4, the first slide rail 41 is disposed between the second slide rail 42 and the third slide rail 43, the moving element 5 includes a first cross beam 51, a second cross beam 52, a third slide block 53 connecting the first cross beam 51 and the second cross beam 52, and a fourth slide block 54 and a fifth slide block 55 disposed at a free end of the first cross beam 51 and a free end of the second cross beam 52, respectively, and the third slide block 53, the fourth slide block 54, and the fifth slide block 55 move along the first slide rail 41, the second slide rail 42, and the third slide rail 43, respectively. Preferably, the first slide block 313 and the second slide block 323 are attached to the first cross member 51 and the second cross member 52, respectively, and the first slide block 313 and the second slide block 323 are movable along the first cross member 51 and the second cross member 52, respectively. Preferably, the first arcuate housing 311, the second arcuate housing 321, and the third slide block 53 can be fitted to form a contour feature similar to the outer circle of the cylinder 11, thereby restricting the shape of the cylinder 11 and avoiding deformation of the cylinder 11.

The number of the wide ribs 12, the grooves 13, the shape control sleeve 3 and the moving part 5 is preferably two.

The invention also discloses a welding method, which uses the cylindrical plastic shell with the built-in wide ribs and comprises the following steps:

(1) fitting at least one wide rib 12 into the cylinder 11 such that an edge of the at least one wide rib 12 fits within the at least one groove 13 of the cylinder 11;

(2) sleeving at least one shape control sleeve 3 on the periphery of the cylinder 11 and corresponding to at least one wide rib 12;

(3) the laser 2 is adjusted to complete the welding of the cylinder 11 to the at least one broad rib 12.

To further explain the welding method of the present invention, it preferably includes the steps of:

(1) the corresponding mounting holes 142 of the two semi-ring ribs 14 are matched with the column bases 143 to form the wide ribs 12, the two wide ribs 12 are arranged in the cylinder 11, and the trapezoidal protrusion 144 of each wide rib 12 is assembled in the corresponding groove 13;

(2) adjusting the relative positions of the two moving members 5 so that the distance between the two moving members 5 is equal to the distance between the two wide ribs 12;

(3) placing the plastic shell 1 equipped with the two wide ribs 12 on the two third sliding blocks 53, and pushing the first shape control sleeve 31 and the second shape control sleeve 32, so that the first shape control sleeve 31, the second shape control sleeve 32 and the third sliding blocks 53 are matched to form a closed circular ring;

(4) the electromagnetic relay 312 is electrified, and the electromagnetic relay 312 is tightly sucked with the square block 322;

(5) the angle c between the first laser beam 21 of the laser 2 and the first welding surface M is adjusted so that c becomes 90 °, the first laser beam 21 is irradiated onto the first welding surface M through the wide rib 12, the angle d between the second laser beam 22 of the laser 2 and the second welding surface N is adjusted so that d becomes 90 °, the second laser beam 22 is irradiated onto the second welding surface N through the wide rib 12, and the welding of the cylinder 11 and the two wide ribs 12 is completed.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. The cylindrical plastic shell with the built-in wide ribs is characterized by comprising a plastic shell, a shape control mechanism and a laser, wherein the plastic shell comprises a hollow cylinder, at least one wide rib and at least one groove arranged on the inner wall of the cylinder, the edge of the at least one wide rib is placed in the at least one groove, the shape control mechanism comprises at least one shape control sleeve, and the at least one shape control sleeve is sleeved on the periphery of the cylinder and is arranged corresponding to the at least one wide rib.

2. The cylindrical plastic shell according to claim 1, wherein the wide rib comprises two half-ring ribs, each half-ring rib comprising a half-ring rib body, at least one mounting hole provided on the half-ring rib body, and at least one pillar stand.

3. The cylindrical plastic shell with the built-in wide rib as claimed in claim 2, wherein the cross section of the groove is trapezoidal, and the edge of the semi-ring rib body is a trapezoidal protrusion.

4. The cylindrical plastic shell with built-in wide ribs as claimed in claim 3, wherein the inner diameter of said cylinder is equal to the starting diameter of said trapezoidal protrusions.

5. The wide rib built-in cylindrical plastic shell according to claim 3, wherein a gap is provided between said trapezoidal protrusion and said groove.

6. The cylindrical plastic shell with the built-in wide rib as claimed in claim 2, wherein the semi-annular rib body is provided with a first notch and a second notch, and the at least one mounting hole and the at least one pillar stand are respectively provided at the first notch and the second notch.

7. The cylindrical plastic shell with the built-in wide rib as claimed in claim 1, wherein said shape control sleeve member comprises a first shape control sleeve and a second shape control sleeve, said first shape control sleeve comprises a first arc-shaped shell and an electromagnetic relay and a first sliding block respectively arranged at the upper end and the lower end of said first arc-shaped shell, said second shape control sleeve comprises a second arc-shaped shell and a square block and a second sliding block respectively arranged at the upper end and the lower end of said second arc-shaped shell.

8. The cylindrical plastic shell with the built-in wide rib as claimed in claim 1, wherein the shape control mechanism further comprises a welding workbench, at least one moving element, and a first sliding rail, a second sliding rail and a third sliding rail arranged on the welding workbench, the moving element comprises a first cross beam, a second cross beam, a third sliding block connecting the first cross beam and the second cross beam, and a fourth sliding block and a fifth sliding block respectively arranged at a free end of the first cross beam and a free end of the second cross beam, and the third sliding block, the fourth sliding block and the fifth sliding block respectively move along the first sliding rail, the second sliding rail and the third sliding rail.

9. The cylindrical plastic shell with the built-in wide rib as claimed in claim 3, wherein the contact part of the trapezoidal protrusion and the groove forms a welding surface, and the laser beam emitted by the laser forms an angle of 90 ° with the welding surface.

10. A welding method of a wide-rib built-in cylindrical plastic case, characterized by using the wide-rib built-in cylindrical plastic case according to any one of claims 1 to 9, comprising the steps of: