CN216182934U

CN216182934U - Plastic laser welding structure and shell

Info

Publication number: CN216182934U
Application number: CN202122711369.1U
Authority: CN
Inventors: 齐照山; 林东峰; 陈明; 陶良军; 严刘万
Original assignee: Shanghai Weibiao Auto Parts Manufacturing Co Ltd
Current assignee: Shanghai Weibiao Auto Parts Manufacturing Co Ltd
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-05
Anticipated expiration: 2031-11-08

Abstract

The application provides a plastics laser welding structure and casing. The plastic laser welding structure comprises a first plastic part and a second plastic part, wherein the first plastic part is provided with a first connecting surface and a limiting convex rib, the second plastic part is provided with a butting surface and a second connecting surface, and the first connecting surface is matched and pressed to the second connecting surface. The connecting surfaces of the first plastic part and the second plastic part are melted under laser irradiation in the laser welding process, so that a welding seam is formed between the first connecting surface and the second connecting surface to form welding connection. Before laser welding, the top of the limiting convex rib and the abutting end face have a set welding distance; after laser welding is finished, the top of the limiting convex rib abuts against the abutting surface. The first plastic part is also provided with an overflow hole, and the molten plastic flows into the overflow hole under the action of the laser welding pressing force in the laser welding process. The first plastic part and the second plastic part of the plastic laser welding structure of the shell are enclosed to form an installation cavity and are connected in a sealing mode through laser welding.

Description

Plastic laser welding structure and shell

Technical Field

The utility model relates to the technical field of plastic laser welding, in particular to a plastic laser welding structure and a shell.

Background

Laser welding of plastics has been widely used as an important branch of laser welding technology in the fields of automobiles, electronics, daily necessities, and the like. Except for the mode that the laser beam is directly focused and irradiated to the position of a welding seam in the traditional laser welding technology, the laser transmission welding utilizes the light transmittance of plastics and the focusing mode of the laser beam, so that the design flexibility of a plastic welding structure is far higher than the design of the welding seam in the direct irradiation mode. A typical production process for transmission welding technology is: firstly, two plastic parts to be welded are assembled together, then a laser beam in a short wave infrared region is directed to a part to be welded, and the laser beam penetrates through the upper plastic part and is focused to the surface of the lower part, so that the lower part absorbs the laser energy and the temperature is increased. And fusing the abutting parts of the lower-layer part and the upper-layer part at high temperature to form a welding seam, so as to realize welding connection. In order to achieve sufficient welding of the weld, a pressing force is usually applied by a laser welding device to press the two parts together.

In order to meet the process requirements, the welding surface of the upper-layer part needs to have higher flatness so as to ensure the uniform distribution of laser energy during welding, thereby forming higher welding strength and achieving better sealing property. The plastic material of the existing upper-layer part is a transparent material with higher warping rigidity, so that the flatness of the product can be ensured to meet the welding requirement. Not only is the requirement on welding materials high, but also the selection range of the materials is small, and the cost is increased. Meanwhile, the plastic is easy to shrink and deform in the processes of heating, melting and recooling, so that only materials are selected, a reasonable welding structure design is not adopted, and local deformation can occur after welding is finished, so that poor welding quality and even welding failure are caused. However, the purchase of high-precision and high-energy laser welding equipment to overcome these problems leads to an increase in equipment investment and a decrease in project economy.

For this reason, utility model patent that publication number is CN209649512U provides a novel plastic laser welding structure for ultrasonic radar sensor, through set up the turn structure of recess form between the edge all around of upper part and the middle part, effectively avoids the shrink deformation after the plastic laser welding shaping, makes the alternative of material strong, and product cost is low.

However, the technical scheme has the following defects:

1. the welding structure is positioned only in the horizontal direction perpendicular to the pressing direction, and the welding structure is not used for controlling the welding thickness in the pressing direction, so that the welding thickness of the welding structure needs to be indirectly controlled through the pressing stroke of welding equipment, and the welding thickness is uneven and the welding quality is difficult to control due to the long tolerance chain of the control dimension;

2. the overflow grooves are only arranged on the two sides of the welding connection surface, so that gas between the welding connection surfaces is difficult to discharge, and poor welding quality is possibly caused;

3. the stability of the welding process and the welding quality of the product cannot be checked through the welding thickness and the overflow condition of the welding structure;

4. the structure is single, and adaptability and setting flexibility are not good.

SUMMERY OF THE UTILITY MODEL

In view of the above disadvantages in the prior art, an object of the present invention is to provide a plastic laser welding structure and a housing based on the same, which can accurately control the welding thickness, optimize the overflow structure, facilitate inspection of the welding quality, and provide flexibility.

In order to achieve the above object, the present invention provides the following technical solutions.

A plastic laser welding structure comprising: the first plastic part is provided with a first connecting surface and a limiting convex rib; the second plastic part is provided with an abutting surface and a second connecting surface; wherein the first connecting surface is matched and pressed to the second connecting surface; the first plastic part is at least arranged at the first connecting surface, and/or the second plastic part is at least arranged at the second connecting surface and can be melted under laser irradiation in the laser welding process, so that a welding seam is formed between the first connecting surface and the second connecting surface to form welding connection; before laser welding, the top of the limiting convex rib and the abutting surface have a first set distance; and after the laser welding is finished, the top of the limiting convex rib is abutted against the abutting surface.

The first plastic part and the second plastic part are both at least partially made of plastic, and specifically, at least one of the first plastic part and the second plastic part can absorb laser energy to be heated and melted, or at least can absorb the laser energy at the welding joint; this can be achieved by a coloured plastic material or by a laser absorbing coating. When the two plastic parts are both made of opaque materials, the welding structure needs to be set to enable laser to be directly focused to the butting position of the two connecting surfaces; when one of the plastic parts is made of a light-transmitting material, a laser transmission welding technology can be adopted. The two plastic parts are subjected to a pressing force in the welding process; in the laser welding process, the first connecting surface and the second connecting surface are melted under the laser irradiation, and are mutually welded under the action of the pressing force of the laser welding equipment to form a welding seam, and the welding connection is formed after cooling. Meanwhile, the plastic in the molten state overflows towards two sides under the action of the pressing force, so that the first plastic part and the second plastic part are close to each other under the action of the pressing force of the laser welding equipment until the top of the limiting convex rib is abutted to the abutting surface. And the first set distance between the top of the limiting convex rib and the abutting surface before welding forms the welding thickness. Multiple welding can be realized by reasonably arranging the connecting surface, the limiting convex rib and the abutting surface; the abutting surface and the limiting convex rib can be discontinuously arranged at a plurality of positions. The connecting surface needs to be arranged in a matching way, but can not be a plane; likewise, the ribs and abutment surfaces are arranged to mate, but the height of the projection from the first attachment surface may vary.

Preferably, the first plastic part is made of transparent material at least partially, so that laser can be focused to the first connecting surface and the second connecting surface which are mutually abutted through the first plastic part during laser welding; the limiting convex rib and the abutting surface abutted against the limiting convex rib are at least partially visible from the outside.

The second plastic part can then be made of an opaque material or at least one of the connecting surfaces can be provided with a laser-absorbing coating. In the laser welding process, one connecting surface is melted and then the other connecting surface is heated to be melted, and the fusion part forms a welding line after being cooled, so that welding connection is realized. The practical butt fusion thickness is conveniently observed when spacing protruding muscle and butt face are located the outside, and the accessible is quick visual inspection whether comprehensive butt of spacing protruding muscle and butt face. When the limiting convex ribs are arranged on two sides of the welding seam or are arranged at a plurality of positions discontinuously, at least part of the limiting convex ribs can be seen from the outer side of the welding structure so as to be convenient for visual inspection. Even if the welding structure cannot realize that the limiting convex ribs are visible, the control of the welding thickness superior to the prior art can be realized through the control of the pressing force and the control of the pressing stroke.

Preferably, the first plastic part has a first locating surface, and the second plastic part has a second locating surface; the first connecting surface extends in a strip shape, and the first positioning surface and the second positioning surface are arranged in a matching manner and are used for positioning the first connecting surface and the second connecting surface in the width direction of the first connecting surface.

The first connecting surface and the second connecting surface are both usually configured as a bar, so that a positioning structure is required to be configured in the width direction for accurately positioning the first positioning surface and the second positioning surface in the width direction.

Preferably, a side surface of the limiting convex rib, the first connecting surface and the first positioning surface enclose a groove-shaped structure, wherein the first connecting surface forms a bottom surface of the groove-shaped structure; the distance between the top of the limiting convex rib and the first connecting surface forms welding limiting height, the width of the groove-shaped structure forms the width of a welding area, and the distance from laser to the first connecting surface through the first plastic part during laser welding forms light transmission thickness; the abutting surface is convexly provided with a bead-shaped welding bead, the top end surface of the welding bead forms the second connecting surface, and the welding bead has a welding bead width and a welding bead height; before laser welding, the welding area width is larger than the welding bead width, the welding bead height is larger than the welding limit height, and the welding bead abuts to the middle of the first connecting surface.

The groove-shaped structure can increase the structural rigidity of the first plastic part and reduce the deformation after welding; the difference between the height of the welding bead and the height of the welding limit forms the welding thickness; when the width of the welding area is larger than the width of the welding bead, and the welding bead is abutted to the groove-shaped structure, namely the middle part of the first connecting surface in the width direction, the welding areas on two sides of the welding bead form an overflow area of molten plastic.

Preferably, the first connecting surface is strip-shaped and extends along a closed path, and the second connecting surface is arranged in a matching manner; the limiting convex rib is positioned on the inner side of the closed path, and the abutting part of the first connecting surface and the second connecting surface is positioned on the outer side of the plastic laser welding structure, so that laser beams can be directly irradiated to the abutting part for welding during laser welding.

When the ribs are arranged on the inner side of the welding seam, the two plastic parts can be made of light-tight materials, and welding is realized by directly focusing laser beams to the welding position.

Preferably, prior to laser welding: the width of the welding bead ranges from 50% to 150% of the light transmission thickness; the height of the welding bead is 0-1.0 mm larger than the width of the welding bead; the welding limit height is 0.1-1.0 mm smaller than the welding bead height, and the difference between the welding limit height and the welding bead height forms the first set distance; the width of the welding area is 100% -200% of the height of the welding bead.

When the size relation between the width of the welding bead and the light transmission thickness is limited, the number of air holes after the welding bead is solidified is small; the welding strength can be higher when the height and the width of the welding bead are limited and the difference between the welding limit height and the height of the welding bead is limited; when the size relation between the width of the welding area and the height of the welding bead is limited, the molten plastic can be uniformly distributed on the welding area, and high strength and tightness of welding connection are achieved. The specific values of the above dimensions are determined according to the types of materials and additives, laser welding parameters and the like.

Preferably, prior to laser welding: the weld bead width is equal to the light transmission thickness; the weld bead height is 0.5mm greater than the weld bead width; the welding limit height is 0.5mm smaller than the welding bead height; the weld zone width is equal to 150% of the bead height.

Above-mentioned structure size sets up to the optimal setting of this application, and the gas pocket in the welding seam is few, welding strength is high, the leakproofness is good after the welding is accomplished.

Preferably, the first plastic part is provided with an overflow hole, and one end of the overflow hole is opened at the first connecting surface; during laser welding, the plastic in the molten state flows into the overflow opening under the effect of the laser welding pressure.

The overflow hole can discharge gas between two connecting surfaces during welding, so that the generation of gas holes in a welding seam is reduced; meanwhile, the molten plastic is cooled and then is combined with the first plastic part into a whole in the overflow hole, so that the welding contact area is increased, and the welding strength is improved. The exhausting and overflowing process can also enable the welding area to uniformly and quickly dissipate heat, reduce the heat influence in the welding process and further reduce the welding deformation.

Preferably, the overflow hole communicates with the outside of the plastic laser welding structure; in the laser welding process, the first connecting surface and the second connecting surface are arranged in an up-and-down overlapping manner, wherein the first connecting surface is located above the second connecting surface.

The overflow holes communicating with the outside facilitate gas discharge and can also be used to check the stability of the welding process and the welding quality. In designs with high requirements for aesthetic quality, the overflow apertures may be open to the interior of the welded structure.

The application also provides a casing, has the installation cavity, including aforementioned any kind of plastic laser welding structure, first working of plastics with the second working of plastics encloses to close and constitutes the installation cavity, first connection face with the second is connected the face and is passed through laser welding and constitute sealing connection.

Through the plastic laser welding structure of the application, high-strength connection and reliable sealing can be realized. When one of them working of plastics set up to the printing opacity piece, not only can realize the laser transmission welding, still can be used to the transmission electromagnetic wave, make the casing that this application provided be applicable to electron device such as radar sensor.

The utility model has the technical effects that:

1. by arranging the limiting convex ribs and the abutting surfaces, the welding thickness of the welding part can be accurately controlled during laser welding of the two plastic parts, and the welding quality and the process stability are improved; meanwhile, when the limiting convex ribs and the abutting surfaces are externally visible, the welding quality can be conveniently and rapidly checked;

2. through the groove-shaped welding structure of the first plastic part, the first plastic part has higher rigidity and smaller deformation after welding;

3. through the arrangement of the overflow area and the overflow holes of the welding area, the welding area generated by welding is uniformly distributed, meanwhile, the welding contact area is increased, and the welding strength is higher; the overflow holes can also enable the welding area to uniformly and quickly dissipate heat, reduce the heat influence in the welding process and reduce the welding deformation;

4. through the optimized setting of the sizes of the light transmission thickness, the welding limit height, the width and height of a welding bead, the width of a welding area and the like, the generation of air holes in a welding seam is reduced, and the quality and the strength of welding connection are optimized;

5. the welding structure has better adaptability by flexibly arranging the limiting convex ribs.

Drawings

The above features, technical features, advantages and modes of realisation of the present invention will be further described in the following detailed description of preferred embodiments thereof, which is to be read in connection with the accompanying drawings.

FIG. 1 is a sectional view of a housing in the first and third embodiments;

FIG. 2 is a perspective view of a first plastic part according to the first embodiment;

FIG. 3 is a schematic cross-sectional view of a first plastic part of the first embodiment;

FIG. 4 is an enlarged view of detail A of FIG. 3;

FIG. 5 is a perspective view of a second plastic part according to the first embodiment;

FIG. 6 is a schematic cross-sectional view of a second plastic part according to the first embodiment;

FIG. 7 is an enlarged view of detail B of FIG. 6;

FIG. 8 is a comparison of the state before and after welding of the housing of the first embodiment;

fig. 9 is an enlarged view of a portion C of fig. 8;

FIG. 10 is a perspective view of a variation of the first plastic part of the first embodiment;

FIG. 11 is a partial sectional view of the second embodiment;

FIG. 12 is a partial sectional view showing a variation of the second embodiment;

the reference numbers illustrate:

10. the structure comprises a first plastic part, 11, a first connecting surface, 12, a limiting convex rib, 13, a first positioning surface, 20, a second plastic part, 21, an abutting surface, 22, a second connecting surface, 23, a second positioning surface, 24, a weld bead, 25, a third connecting surface, 30, an overflow hole, 40, a third plastic part and 41, a fourth connecting surface.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will describe the specific embodiments of the present invention with reference to the accompanying drawings. The drawings in the following description are only examples of the utility model, and it will be clear to a person skilled in the art that other drawings and embodiments can be obtained from these drawings without inventive effort.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In some of the figures, elements having the same structure or function are shown only schematically or only schematically. In this document, "one" means not only "only one" but also a case of "more than one". The term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items. The terms "first," "second," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows: a plastic laser welding structure.

As shown in fig. 1, the plastic laser welding structure of the present embodiment includes a first plastic member 10 and a second plastic member 20 for constituting a vehicle-mounted millimeter wave radar housing. As shown in fig. 2 to 4, the first plastic part 10 has a first connecting surface 11 and a limiting rib 12; as shown in fig. 5 to 7, the second plastic part 20 has an abutting surface 21 and a second connecting surface 22; wherein the first connecting surface 11 is press-fitted to the second connecting surface 22; the first plastic part 10 is made of a light-transmitting material and the second plastic part 20 is made of a light-impermeable material, wherein the second plastic part 20 melts at the second connecting surface 22 and is welded to the first connecting surface 11 to form a weld joint during the laser welding process.

As shown in fig. 8 and 9, before the laser welding, the top of the position-restricting convex rib 12 has a first set distance of 0.5mm from the abutment surface 21; after the laser welding is completed, the top of the stopper rib 12 abuts against the abutment surface 21. Therefore, when the laser welding equipment is used for pressing two plastic parts, the pressing process can be controlled through the pressing force, and the two plastic parts are ensured to be uniformly pressed. The shape of the welded seam after welding depends on the size design of the welding structure, and the welding effect is stable and reliable. When the limiting structure is not arranged in the prior art, the welding effect needs to be controlled by the precision of the pressing mechanism of the laser welding equipment and the precision of the upper surface of the first plastic part 10 bearing the pressing force, and the limiting structure is also related to factors such as laser input power, the heat dissipation effect of the welding structure, the laser welding feeding speed and the like, so that the influence factors are more, the control requirement is high, and the welding quality is difficult to ensure. As can be seen from fig. 9, the stopper rib 12 and the abutment surface 21 abutting against it are externally visible. During and after the welding process, the position relation between the limiting convex rib 12 and the abutting surface 21 can be clearly seen, so that whether the welding process is normal or not can be quickly confirmed.

As shown in fig. 4, 7 and 9, the first plastic part 10 has a first locating surface 13 and the second plastic part 20 has a second locating surface 23; the first connecting surface 11 extends in a strip shape, and the first positioning surface 13 and the second positioning surface 23 are disposed in a matching manner and are used for positioning the first connecting surface 11 and the second connecting surface 22 in a width direction of the first connecting surface 11. As shown in fig. 8 and 9, the first positioning surface 13 and the second positioning surface 23 are both disposed around the housing, and due to the manufacturing tolerance, the first positioning surface 13 and the second positioning surface 23 are not easy to be completely abutted and attached in mass production, but have a certain gap. However, the gap is only about 0.1mm, which satisfies the positioning accuracy requirement between the first connecting surface 11 and the second connecting surface 22, and therefore does not affect the positioning function of the two positioning surfaces.

As shown in fig. 4 and 9, one side surface of the position-limiting rib 12, the first connecting surface 11 and the first positioning surface 13 are enclosed to form a groove-shaped structure, wherein the first connecting surface 11 forms a bottom surface of the groove-shaped structure; before laser welding, the distance between the top of the limiting convex rib 12 and the first connecting surface 11 constitutes a welding limiting height a, the width of the groove-shaped structure constitutes a welding area width b, and the distance that laser penetrates through the first plastic part 10 to reach the first connecting surface 11 during laser welding, namely the wall thickness of the first plastic part 10 at the first connecting surface 11, constitutes a light transmission thickness c, in this embodiment, the light transmission thickness c is the thickness at the edge of the first plastic part 10. As shown in fig. 7, a bead 24 is formed on the abutment surface 21 in a raised manner, the top end surface of the bead 24 constitutes the second connection surface 22, and the bead 24 has a bead width d and a bead height e. Before the laser welding, the welding area width b is greater than the bead width d, the bead height e is greater than the welding limit height a, and the top of the bead 24, i.e., the second connection face 22, abuts to the first connection face 11 at the middle of the groove-like structure.

According to the specific materials of the two plastic parts, the laser welding feeding speed, the laser power and other factors, the preferable range of the welding bead width b is 50-150% of the light transmission thickness c; the height e of the welding bead is 0-1.0 mm larger than the width d of the welding bead; the welding stopper height a is smaller than the bead height e by 0.1 to 1.0mm, and the difference between the welding stopper height a and the bead height e constitutes a first set distance f, i.e., the fusion thickness during laser welding, and as can be seen from the above arrangement, f is preferably in the range of 0.1 to 1.0 mm. The welding region width b is preferably in the range of 100% to 200% of the bead height e. After the light transmission thickness c is determined, the preferable value ranges of other sizes can be sequentially determined. The light transmission thickness c of the first plastic part 10 of the millimeter wave radar housing of the embodiment is 1mm, the weld bead width b is 1mm, the weld bead height e is 1mm, the welding limit height a is 0.5mm, the welding area width b is 2mm, the first set distance f or the welding thickness is 0.5mm through calculation, and the overflow area widths on two sides of the weld bead 24 are respectively 0.5 mm.

As shown in fig. 2 and 4, the first connection surface 11 and the second connection surface 22 are disposed in an overlapping manner, wherein the first connection surface 11 is located above. The first plastic part 10 has a plurality of overflow holes 30 distributed at the groove-like structure, one end of the overflow holes 30 is open at the first connection surface 11, and the other end is communicated with the outside of the housing. During the laser welding process, the plastic in the molten state flows into the overflow aperture 30 under the laser welding pressure. As shown in fig. 9, the arrangement of the overflow holes 30 can not only increase the welding connection area, but also be used to check the welding quality and the stability of the welding process. For example, in the plastic laser welding structure of the present embodiment, when the structure is normally produced, a small amount of plastic overflows from each overflow hole 30, and the welding quality state and the stability of the welding process can be quickly known through the amount and the flow state of the overflowing plastic.

As a variation of this embodiment, as shown in fig. 10, the first plastic part 10 may not be provided with the overflow holes 30, and is suitable for use in a case where the appearance of the first plastic part 10 is required. According to the input amount of laser energy, the first plastic part 10 can be insolubilized at the first connecting surface 11 and can be infiltrated by the molten plastic of the second plastic part 20 to generate adhesion, so that the plastic welding device is suitable for occasions with low requirements on strength and sealing property; the first plastic part 10 can also be melted by the high temperature generated by the second plastic part 20 to create a weld that is more robust. An opaque coating may also be provided on first connecting surface 11 to allow first plastic part 10 to melt during the welding process. In addition, since the welding bead 24 of the present embodiment forms a closed ring shape around the housing, and the second plastic part 20 has a larger thickness as a main body of the housing, it has a higher structural strength and can withstand a higher pressing force during the laser welding process. The width d of the weld bead of the present embodiment is preferably set to 1mm according to the light transmission thickness c, but the width d of the weld bead may take other values within a preferable range according to the structural strength requirement, and the width b of the welding area may take an appropriate value according to the width d of the weld bead, the height e of the weld bead, and the laser welding parameters, so as to leave an appropriate overflow space on both sides of the weld bead 24.

Example two: a plastic laser welding structure.

As shown in fig. 11, the difference between the plastic laser welding structure of the present embodiment and the first embodiment is that the limiting rib 12 is disposed inside the housing, and the first plastic part 10 and the second plastic part 20 are made of opaque material. Therefore, the abutting portion of the first connection surface 11 and the second connection surface 22 is located on the outer side, and laser welding is performed from the outside.

As a variation of this embodiment, the welding of multiple parts can also be performed by the plastic laser welding structure provided in the present application. For example, as shown in fig. 12, the third plastic part 40 is made of a light-transmitting material, and the fourth connecting surface 41 thereof abuts against the third connecting surface 25 of the second plastic part 20 and is welded by a laser transmission welding technique, and the limiting structure for controlling the welding thickness is located at a visible position outside the housing.

Example three: a housing is provided.

As shown in fig. 1, the housing of the present embodiment is used for a vehicle-mounted millimeter wave radar, and has a mounting cavity, including the plastic laser welding structure of the first embodiment, the first plastic part 10 and the second plastic part 20 enclose to form the mounting cavity for mounting electronic components, and the first connecting surface 11 and the second connecting surface 22 form a sealing connection through laser welding. Wherein the first plastic part 10 is a transparent part which plays a role in light transmission during laser transmission welding.

The plastic laser welding structure is flexible in arrangement and good in adaptability, can be used for shells of various sensors, electronic devices and daily necessities, and is particularly suitable for mass production due to stable welding quality and simple control of the welding process.

The foregoing is only a preferred embodiment of the present application and the technical principles employed, and various obvious changes, rearrangements and substitutions may be made without departing from the spirit of the application. Other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and variations in various respects, all without departing from the spirit of the present application. The features in the above embodiments and embodiments may be combined with each other without conflict.

Claims

1. A plastic laser welding structure, comprising:

a first plastic part (10) having a first connecting surface (11) and a limiting convex rib (12);

a second plastic part (20) having an abutment surface (21) and a second connection surface (22);

wherein the first connection face (11) is press-fitted to the second connection face (22); the first plastic part (10) can be melted at least at the first connection surface (11) and/or the second plastic part (20) can be melted at least at the second connection surface (22) under laser irradiation during a laser welding process, so that a weld seam is formed between the first connection surface (11) and the second connection surface (22) to form a welded connection;

before laser welding, the top of the limiting convex rib (12) has a first set distance with the abutting surface (21); after the laser welding is finished, the top of the limiting convex rib (12) is abutted against the abutting surface (21).

2. The plastic laser welding structure according to claim 1, wherein:

the first plastic part (10) is at least partially made of transparent materials, so that laser can penetrate through the first plastic part (10) to be focused to the first connecting surface (11) and the second connecting surface (22) which are mutually abutted during laser welding;

the limiting convex rib (12) and the abutting surface (21) abutting against the limiting convex rib are at least partially visible from the outside.

3. The plastic laser welding structure according to claim 2, characterized in that:

the first plastic part (10) has a first positioning surface (13), and the second plastic part (20) has a second positioning surface (23);

the first connecting surface (11) extends in a strip shape, and the first positioning surface (13) and the second positioning surface (23) are arranged in a matching manner and used for positioning the first connecting surface (11) and the second connecting surface (22) in the width direction of the first connecting surface (11).

4. The plastic laser welding structure according to claim 3, wherein:

one side surface of the limiting convex rib (12), the first connecting surface (11) and the first positioning surface (13) are enclosed to form a groove-shaped structure, wherein the first connecting surface (11) forms the bottom surface of the groove-shaped structure;

before laser welding, the distance between the top of the limiting convex rib (12) and the first connecting surface (11) forms welding limiting height, the width of the groove-shaped structure forms the width of a welding area, and the distance from laser to the first connecting surface (11) through the first plastic part (10) during laser welding forms light transmission thickness;

a rib-shaped weld bead (24) is formed on the abutting surface (21) in a protruding mode, the top end face of the weld bead (24) forms the second connecting surface (22), and the weld bead (24) has a weld bead width and a weld bead height;

before laser welding, the welding area width is larger than the welding bead width, the welding bead height is larger than the welding limit height, and the welding bead (24) is abutted to the middle of the first connecting surface (11).

5. The plastic laser welding structure according to claim 1, wherein:

the first connecting surface (11) is strip-shaped and extends along a closed path, and the second connecting surface (22) is arranged in a matching way;

the limiting convex rib (12) is located on the inner side of the closed path, and the abutting part of the first connecting surface (11) and the second connecting surface (22) is located on the outer side of the plastic laser welding structure, so that laser beams can be directly irradiated to the abutting part for welding during laser welding.

6. The plastic laser welding structure according to claim 4, characterized in that:

before laser welding:

the width of the welding bead ranges from 50% to 150% of the light transmission thickness;

the height of the welding bead is 0-1.0 mm larger than the width of the welding bead;

the welding limit height is 0.1-1.0 mm smaller than the welding bead height, and the difference between the welding limit height and the welding bead height forms the first set distance;

the width of the welding area is 100% -200% of the height of the welding bead.

7. The plastic laser welding structure according to claim 6, wherein:

before laser welding:

the weld bead width is equal to the light transmission thickness;

the weld bead height is 0.5mm greater than the weld bead width;

the welding limit height is 0.5mm smaller than the welding bead height;

the weld zone width is equal to 150% of the bead height.

8. The plastic laser welding structure according to any one of claims 1 to 7, characterized in that:

the first plastic part (10) is provided with an overflow hole (30), and one end of the overflow hole (30) is opened at the first connecting surface (11);

during the laser welding process, the molten plastic flows into the overflow hole (30) under the action of the laser welding pressure force.

9. The plastic laser welding structure according to claim 8, wherein:

the overflow hole (30) is communicated with the outside of the plastic laser welding structure;

during the laser welding process, the first connection surface (11) and the second connection surface (22) are arranged one above the other, wherein the first connection surface (11) is located above.

10. A housing having a mounting cavity, characterized in that:

the plastic laser welding structure according to any one of claims 1 to 9, wherein the first plastic part (10) and the second plastic part (20) enclose the installation cavity, and the first connection surface (11) and the second connection surface (22) form a sealing connection by laser welding.