阅读说明：本技术 一种锐边一体式灯罩生产工艺方法及采用该工艺制成的灯罩 (Sharp edge integrated lampshade production process method and lampshade manufactured by adopting process ) 是由 吴淑汉 叶秉元 钟水升 刘苏亮 张祥武 林子明 张泽滨 刘平 邓展谋 余俊锋 王 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种锐边一体式灯罩生产工艺方法及灯罩,具有如下步骤,开料：将塑胶板铣削加工或冲制成胚料,该胚料内部加有扩散剂,能作为光扩散作用的扩散板；在所述胚料的四角处开有方形缺口,相邻缺口之间的胚料部分形成四条侧边；折弯：将侧边依次折弯,形成一个盒状半成品灯罩；侧边折弯后,盒状半成品灯罩相邻侧边之间会形成一个侧对接的结构,在相邻侧边相对接的部位存在缝隙；封缝：将边条粘接到盒状半成品灯罩相邻侧边相接的内表面或用塑料焊条焊接相邻侧边,将缝隙进行封闭处理,边条两侧与相邻侧边贴合；圆角修缮抛光。采用这种结构和工艺的灯罩,可以确保灯罩实现锐边效果,整体干净整洁,尺寸稳定,透光均匀一致,长久使用不松脱、不开裂,符合大批量生产产品质量稳定性和一致性的要求。(The invention discloses a production process method of a sharp-edge integrated lampshade and the lampshade, which comprises the following steps: milling or punching the plastic board into a blank, wherein a diffusing agent is added in the blank and can be used as a diffusion plate with light diffusion function; square notches are formed at the four corners of the blank, and four side edges are formed at the blank part between the adjacent notches; bending: bending the side edges in sequence to form a box-shaped semi-finished lampshade; after the side edges are bent, a side butt joint structure is formed between the adjacent side edges of the box-shaped semi-finished lampshade, and a gap is formed at the butt joint part of the adjacent side edges; sealing the seam: bonding the edge strips to the inner surfaces of the adjacent side edges of the box-shaped semi-finished product lampshade or welding the adjacent side edges by using plastic welding rods, sealing the gaps, and attaching the two sides of the edge strips to the adjacent side edges; and (5) repairing and polishing round corners. The lampshade adopting the structure and the process can ensure that the lampshade realizes sharp edge effect, is clean and tidy as a whole, has stable size and uniform light transmission, is not loosened and cracked after being used for a long time, and meets the requirements of quality stability and consistency of mass production products.)

1. A production process method of a sharp-edge integrated lampshade is characterized by comprising the following steps of aiming at a side butt joint structure and a sealing processing process thereof,

cutting:

1.1, milling or punching a plastic plate into a rectangular blank, wherein a diffusant is added into the blank and can be used as a diffusion plate with light diffusion function;

1.2, square notches are formed at four corners of the blank, two wall surfaces of each notch are kept at straight edges and are in a right angle, the blank part between every two adjacent notches forms four side edges, the four side edges are divided into two groups of long side edges and short side edges, and each pair of side edges is a group;

1.3, a V-shaped crack arrest groove is formed in the bottom of the square notch, and two wall surfaces of the V-shaped crack arrest groove keep straight edges;

step two, bending:

2.1, sequentially bending four side edges formed by the blank in the step one to form a box-shaped semi-finished lampshade, wherein the bending angle range of the four side edges is 80-90 degrees, and the bending inner radius R is 0-3.0 MM;

2.2, after the side edges are bent, a side butt joint structure is formed between the adjacent side edges of the box-shaped semi-finished lampshade, and the adjacent side edges form a right angle; there is a gap at the butt joint position of adjacent side, specifically: the gap is formed between the outer end faces of the two ends of the short side and the inner side face of the end of the long side;

step three, seam sealing:

bonding the edge strips to the inner surfaces of the adjacent side edges of the box-shaped semi-finished product lampshade or welding the adjacent side edges by using plastic welding rods, sealing the gaps, and attaching the two sides of the edge strips to the adjacent side edges; or directly coating the viscous adhesive on the gap for filling treatment;

3.1, glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that relative positions of four side edges are kept stable and immovable, then coating an adhesive on the inner side of a gap and the area of the side edges with the same width as the edge strips, then adhering the edge strips on the adhesive coating area, and curing at normal temperature;

3.2, a hot-melting welding process: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing:

and (3) performing round corner or oblique angle repairing and polishing treatment on the outer sides of four corners of the semi-finished product of the lampshade after the sealing treatment by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner parts, and ensuring that the glue thickness at the corner parts is basically consistent with that of the side edges and the corner parts are flat and smooth.

2. A process for manufacturing an integral sharp-edged lampshade as claimed in claim 1, wherein: the specific bending mode in the second step is cold bending or hot bending, the cold bending is carried out by adopting a hydraulic bending machine, the blank is horizontally arranged on a V-shaped machine table, a hydraulic head is arranged above the blank, and the bent part is bent by pressing downwards; and hot bending is carried out by adopting an automatic hot bending machine, the blank is horizontally arranged on a machine table, the part to be bent is heated and softened, then the blank is turned over, and air cooling is carried out after the turning over is finished so as to be cured and formed.

3. A process for manufacturing an integral sharp-edged lampshade as claimed in claim 1, wherein: before the bending step, a 90-degree V-shaped groove is formed in the part to be bent of the side edge of the surface of the blank, and the side edge is sequentially bent along the 90-degree V-shaped groove.

4. A production process method of a sharp-edge integrated lampshade is characterized by comprising the following steps of aiming at a 45-degree inclined plane butt joint and seam sealing treatment process,

cutting:

1.1, milling or punching a plastic plate into a square blank, wherein a diffusant is added into the blank and can be used as a diffusion plate with a light diffusion function;

1.2, square notches are formed in four corners of a blank, the wall surfaces of the square notches are milled to form 45-degree chamfers, four equal-length side edges are formed on the blank part between every two adjacent square notches, and arc-shaped bending process inclined planes are arranged at the bottom in each square notch; a 90-degree V-shaped groove is formed in the surface of the blank, the side edge of which is connected with the blank main body;

step two, bending:

2.1, sequentially bending four equal-length side edges of the blank to form a box-shaped semi-finished lampshade; the bending angle range of the four equal-length side edges is 80-90 degrees, and the bending inner radius is 0-3.0 MM;

2.2, after the four side edges are bent, a 45-degree inclined plane butt joint structure is formed between the four adjacent side edges of the box-shaped semi-finished lampshade; a gap exists between the 45-degree inclined planes of the adjacent side edges;

step three, seam sealing:

adhering the edge strips to the inner surface of the box-shaped semi-finished lampshade, which is connected with the adjacent side edges, or welding the adjacent side edges by using a plastic welding rod, sealing the gaps, and adhering the two sides of the edge strips to the adjacent side edges; or directly coating the viscous adhesive on the gap for filling treatment;

3.1, glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that the relative positions of four equal-length side edges are kept stable, then coating an adhesive on the inner side of a gap and the area of the side edges with the same width as the edge strips, then adhering the edge strips on the adhesive-coated area, and curing at normal temperature;

3.2, a hot-melting welding process: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing:

and (3) performing round corner or oblique angle repairing and polishing treatment on the outer sides of the four corners of the sealed and sewed lampshade by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner parts, and ensuring that the glue thickness at the corner parts is basically consistent with that of the side edges, and the corner parts are flat and smooth.

5. The production process method of the sharp-edged integrated lampshade as claimed in claim 4, characterized in that: the specific bending mode in the second step is cold bending or hot bending, the cold bending is carried out by adopting a hydraulic bending machine, the blank is horizontally arranged on a V-shaped machine table, a hydraulic head is arranged above the blank, and the bent part is bent by pressing downwards; and hot bending is carried out by adopting an automatic hot bending machine, the blank is horizontally arranged on a machine table, the part to be bent is heated and softened, then the blank is turned over, and air cooling is carried out after the turning over is finished so as to be cured and formed.

6. A production process method of a sharp-edge integrated lampshade is characterized by comprising the following steps of aiming at a 60-degree inclined plane butt joint and seam sealing treatment process,

cutting:

1.1, milling or punching a plastic plate into a hexagonal blank, wherein a diffusing agent is added into the blank and can be used as a diffusion plate with a light diffusion function;

1.2, forming triangular notches at corners of the blank, milling the wall surfaces of the triangular notches to form 60-degree chamfers, forming six side edges on the blank part between every two adjacent triangular notches, and arranging circular arc-shaped bending process inclined planes at the bottom in each triangular notch; a 90-degree V-shaped groove is formed in the surface of the blank, the side edge of which is connected with the blank main body;

step two, bending:

2.1, sequentially bending six side edges of the blank to form a box-shaped semi-finished lampshade; the bending angle range of the six side edges is 80-90 degrees, and the bending inner radius is 0-3.0 MM;

2.2, after the six side edges are bent, a 60-degree inclined plane butt joint structure is formed between six adjacent side edges of the box-shaped semi-finished lampshade; a gap exists between the adjacent 60-degree inclined planes of the side edges;

step three, seam sealing:

adhering the edge strips to the inner surface of the box-shaped semi-finished lampshade, which is connected with the adjacent side edges, or welding the adjacent side edges by using a plastic welding rod, sealing the gaps, and adhering the two sides of the edge strips to the adjacent side edges; or directly coating the viscous adhesive on the gap for filling treatment;

3.1, glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that the relative position of the side edge is kept stable and immovable, then coating an adhesive on the inner side of the gap and the area of the side edge with the same width as the edge strip, then adhering the edge strip on the adhesive coating area, and curing at normal temperature;

3.2, a hot-melting welding process: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing:

and (3) performing round corner or oblique angle repairing and polishing treatment on the outer side edge of the corner of the sealed lampshade by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner part, and ensuring that the glue thickness at the corner part is basically consistent with that of the side edge and the corner part is flat and smooth.

7. A lampshade formed by the process of claim 1 or 4 or 6, wherein: the lamp shade comprises a planar lamp shade main body (50), wherein the edge of the lamp shade main body (50) is bent in the same direction to form a shade edge (501), an angle of 80-90 degrees is formed between the shade edge (501) and the lamp shade main body (50), the bending inner radius R is 0-3MM, and a right angle or 120-degree included angle is formed between the adjacent shade edges (501); the novel combined type heat-insulation cover is characterized by further comprising a connecting strip (502) arranged at the joint of the adjacent cover edges (501), wherein the two sides of the connecting strip (502) are respectively connected with the adjacent cover edges (501) through glue or hot-melt welding or directly coated on a gap between the adjacent cover edges through sticky adhesive to be filled.

8. The mask of claim 7, wherein: the connecting strip (502) is L-shaped or triangular, and two wall surfaces of the connecting strip are respectively attached to the surfaces of the adjacent cover sides (501) through glue.

9. The mask of claim 7, wherein: the lampshade main body (50) is square, rectangular or hexagonal.

10. The mask of claim 7, wherein: the cover edge (501) is bent with the lampshade main body (50) to form an included angle through a 90-degree V-shaped groove formed in the surface of the lampshade main body (50).

Technical Field

The invention relates to the technical field of lighting lamps, in particular to a production process method of an integrated lampshade.

Background

With the improvement of the economic development level, various requirements of people on life are gradually increased, and the panel lamp becomes complex and diversified, economical and practical and has a concise appearance and is widely popularized and used. In the panel lamp product category, most of the panel lamps are provided with frames, and the frame-free panel lamp is one of the development trends of the panel lamp, mainly because the frame-free panel lamp can be used as a single lamp like a frame panel lamp, and can also be freely spliced into a light wall or a light curtain with uniform light and no dark area; in the field of frameless panel lamp products, especially sharp-edged square or irregular frameless panel lamps, the application field is the widest and the most promising.

As a panel lamp replacement product, how to realize efficient production of economic cost of sharp-edge frameless panel lamps with uniform light emission is still an important subject of the lighting industry. The sharp-edged lampshade which is smooth and uniform in light emitting and suitable for splicing the light wall or the light curtain is used as a key part of the frameless panel lamp, and how to design and produce the frameless panel lamp is different from the sharp-edged lampshade in each company.

There are four mainstream technologies of lamp covers adopted by frameless panel lamps currently in the market.

As shown in fig. 1 and 2, the first method is to adopt a thick PMMA plate and produce the PMMA plate by a mechanical groove milling method, and although the sharp edge design feature is realized, the cost is high, the optical shadow caused by the groove position of the groove can not be eliminated, i.e. the uniformity of the light-emitting surface can not be ensured, and the application requirement of splicing a light wall or a light curtain without a dark area can not be met, and the problem can not be solved.

As shown in fig. 3, in the second type, a PMMA flat plate and four PMMA side bars are bonded by UV glue to form a square lampshade, although a sharp edge effect is achieved and optical shadows caused by groove routing are avoided, the lampshade is split into a plurality of parts (one flat plate and 4 side bars are split), all the parts are bonded by UV glue to be fixed with each other, and the total bonding length is very long; at present, the bonding process basically depends on manual treatment, the time for completely curing the glue is generally 24 hours, various problems such as foaming, whitening, degumming and the like are easy to occur, and the product quality is difficult to keep stable. Moreover, because of more components, the bonding process has high requirements on the processing surface and precision of the components, and the processing cost of the components is high; the PMMA board also absorbs moisture and heat to cause the size change, the UV glue is a brittle material after being cured, and the lamp shade with the pure bonding structure has the risk that each part is easy to loosen due to glue aging or mechanical fatigue after being applied for a long time.

The third method is to produce PMMA or PS lampshade by precise injection molding; the lampshade adopting the process can realize a small-size sharp-edge integrated lampshade; the length and width of the product are basically not more than 300 × 300MM, the lampshade is concise in appearance, and light transmission is uniform; however, if a sharp-edge integrated lampshade manufactured by a larger-size injection molding process needs to be produced, great technical risks exist, and higher cost needs to be borne. This requirement is quite different from the requirement for large size injection molded panels that are opaque for use in domestic central air conditioning indoor stands that we use on a daily basis. The indoor vertical machine of the household central air conditioner or other similar large-size injection molding parts are generally light-proof, the outer surface of the indoor vertical machine is generally designed into a cambered surface, and a large number of ribs are allowed to be arranged inside the indoor vertical machine to meet the requirements of an injection molding process. Therefore, the injection molding process cannot be applied to the production of large-size sharp-edged square or special-shaped integrated lamp covers.

As shown in fig. 4, the fourth method is to produce the integrated PMMA or PS lampshade by using a mature plastic-absorbing or blow-molding process, which can indeed meet the production of circular, oval or square lampshade with large-size arc edges or polygonal lampshade (arc transition is provided at four corners of the lampshade and at other places with shapes). The process has the advantages of stable quality, high efficiency and low cost. However, the process cannot produce sharp-edged square or polygonal or other special-shaped integrated lamp covers, the blow molding or plastic suction process is mainly characterized in that plastic plates are heated and softened, then the plastic plates are shaped and produced by a mold, all the modeling parts of the lamp covers are excessively rounded, and otherwise, the problem of pulling crack or wrinkle occurs. It is also directly determined that the blister or blow molding process cannot produce a lampshade that can meet the requirements of splicing light walls or light curtains.

Disclosure of Invention

The invention aims to provide an integrated lampshade meeting the sharp edge of a spliced light wall or light curtain and a process method for manufacturing the lampshade aiming at the technical problems in the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme: a production process method of a sharp-edge integrated lampshade aims at a side butt joint structure and a sealing processing process thereof and comprises the following steps,

cutting: punching a plastic board into a rectangular blank, wherein a diffusing agent is added in the blank and can be used as a diffusion plate with light diffusion function; the four corners of the blank are provided with square notches, two wall surfaces of each notch are kept at straight sides and are in right angles, the blank part between every two adjacent notches forms four side edges, the four side edges are divided into two groups of long side edges and short side edges, and each pair of side edges is a group; a V-shaped crack arrest groove is formed in the bottom of the square notch, and two wall surfaces of the V-shaped crack arrest groove are kept straight;

step two, bending: sequentially bending four side edges formed by the blank in the step one to form a box-shaped semi-finished lampshade, wherein the bending angle range of the four side edges is 80-90 degrees, and the bending inner radius R is 0-3 MM; after the side edges are bent, a side butt joint structure is formed between the adjacent side edges of the box-shaped semi-finished lampshade, and the adjacent side edges form a right angle; there is a gap at the butt joint position of adjacent side, specifically: the gap is formed between the outer end faces of the two ends of the short side and the inner side face of the end of the long side;

step three, seam sealing: bonding the edge strip to the inner surface of the box-shaped semi-finished lampshade, which is connected with the adjacent side edge, or welding the adjacent side edge by using a plastic welding rod, sealing the gap, and attaching the two sides of the edge strip to the adjacent side edge;

glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that relative positions of four side edges are kept stable and immovable, then coating an adhesive on the inner side of a gap and the area with the same width as the edge strips on the side edges, then adhering the edge strips on the adhesive coating area, and curing at normal temperature; or directly coating the viscous adhesive on the gap for filling treatment;

the hot-melt welding process comprises the following steps: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing: and (3) performing round corner or oblique angle repairing and polishing treatment on the outer sides of four corners of the semi-finished product of the lampshade after the sealing treatment by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner parts, and ensuring that the glue thickness at the corner parts is basically consistent with that of the side edges and the corner parts are flat and smooth.

The specific bending mode in the second step is cold bending or hot bending, the cold bending is carried out by adopting a hydraulic bending machine, the blank is horizontally arranged on a V-shaped machine table, a hydraulic head is arranged above the blank, and the bent part is bent by pressing downwards; and hot bending is carried out by adopting an automatic hot bending machine, the blank is horizontally arranged on a machine table, the part to be bent is heated and softened, then the blank is turned over, and air cooling is carried out after the turning over is finished so as to be cured and formed.

Before the bending step, a 90-degree V-shaped groove is formed in the part to be bent of the side edge of the surface of the blank, and the side edge is sequentially bent along the 90-degree V-shaped groove. Through the design of this V-arrangement groove, can more effectively guarantee the convenience of bending, guarantee the better sharp limit effect in side position.

Aiming at the 45-degree inclined plane butt joint and seam sealing treatment process, the method comprises the following steps,

cutting: punching a plastic plate into a square blank, wherein a diffusing agent is added in the blank and can be used as a diffusion plate with light diffusion function; square notches are formed in four corners of the blank, 45-degree chamfers are milled on the wall surfaces of the square notches, four equal-length side edges are formed on the blank between every two adjacent square notches, and arc-shaped bending process inclined planes are arranged at the bottom in each square notch; the 90-degree V-shaped groove is formed in the surface of the blank, the side edge of which is connected with the blank main body, so that the bending process can be more effectively ensured to be carried out and a better sharp edge effect of the side edge part is ensured;

step two, bending: sequentially bending four equal-length side edges of the blank to form a box-shaped semi-finished lampshade; the bending angle range of the four equal-length side edges is 80-90 degrees, and the bending inner radius is 0-3 MM; after the four side edges are bent, a 45-degree inclined plane butt joint structure is formed between four adjacent side edges of the box-shaped semi-finished lampshade; a gap exists between the 45-degree inclined planes of the adjacent side edges;

step three, seam sealing: adhering the edge strips to the inner surface of the box-shaped semi-finished lampshade, which is connected with the adjacent side edges, or welding the adjacent side edges by using a plastic welding rod, sealing the gaps, and adhering the two sides of the edge strips to the adjacent side edges;

glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that the relative positions of four equal-length side edges are kept stable, then coating an adhesive on the inner side of a gap and the area of the side edges with the same width as the edge strips, then adhering the edge strips on the adhesive coating area, and curing at normal temperature; or directly coating the viscous adhesive on the gap for filling treatment;

the hot-melt welding process comprises the following steps: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing: and (3) performing round corner or oblique angle repairing and polishing treatment on the outer sides of the four corners of the sealed and sewed lampshade by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner parts, and ensuring that the glue thickness at the corner parts is basically consistent with that of the side edges, and the corner parts are flat and smooth.

Aiming at the 60-degree inclined plane butt joint and seam sealing treatment process, the method comprises the following steps,

cutting: punching a plastic plate into a hexagonal blank, wherein a diffusing agent is added in the blank and can be used as a diffusion plate with light diffusion function; triangular notches are formed in corners of the blank, 60-degree chamfers are milled on the wall surfaces of the triangular notches, six side edges are formed on the blank part between every two adjacent triangular notches, and circular arc-shaped bending process inclined planes are arranged at the inner bottom of each triangular notch;

step two, bending: sequentially bending six side edges of the blank to form a box-shaped semi-finished lampshade; the bending angle range of the six side edges is 80-90 degrees, and the bending inner radius is 0-3 MM; after the six side edges are bent, a 60-degree inclined plane butt joint structure is formed between the six adjacent side edges of the box-shaped semi-finished lampshade; a gap exists between the 60-degree inclined planes of the adjacent side edges; a 90-degree V-shaped groove is formed in the surface of the blank, the side edge of which is connected with the blank main body;

step three, seam sealing: adhering the edge strips to the inner surface of the box-shaped semi-finished lampshade, which is connected with the adjacent side edges, or welding the adjacent side edges by using a plastic welding rod, sealing the gaps, and adhering the two sides of the edge strips to the adjacent side edges;

glue coating process: fixing the semi-finished lampshade on an inwards concave positioning fixture, ensuring that the relative position of the side edge is kept stable and immovable, then coating an adhesive on the inner side of the gap and the area of the side edge with the same width as the edge strip, then adhering the edge strip on the adhesive coating area, and curing at normal temperature; or directly coating the viscous adhesive on the gap for filling treatment;

the hot-melt welding process comprises the following steps: placing the semi-finished lampshade on a positioning fixture, and carrying out hot-melt welding on plastic welding rods to the four-corner gap positions of the lampshade blank by using a hot-melt plastic welding gun to form a triangular plastic filling welding seam effect;

step four, round corner repairing and polishing: and (3) performing round corner or oblique angle repairing and polishing treatment on the outer side edge of the corner of the sealed and sewed lampshade by using a corner guiding machine or a corner routing machine, removing residual glue, burrs, flashes, stains and the like at the corner part, and ensuring that the glue thickness at the corner part is basically consistent with that of the side edge and the corner part is flat and smooth.

The invention also provides a lampshade according to the production process method, which comprises a planar lampshade main body, wherein the edge of the lampshade main body is bent towards the same direction to form a cover edge, an angle of 80-90 degrees is formed between the cover and the lampshade main body, the bending inner radius R is 0-3MM, and a right angle or 120-degree included angle is formed between adjacent cover edges; the connecting strip is arranged at the joint of the adjacent cover edges, and the two sides of the connecting strip are respectively connected with the adjacent cover edges through glue or hot-melt welding or the adjacent cover edges are directly coated on the gap through sticky adhesives to be filled.

Compared with the prior art, the invention has the following technical effects that the lampshade is formed into a box-shaped structure by the PC or PMMA or PS flat plate hot bending or cold bending process, and then the corner parts of the adjacent side edges are subjected to seam sealing treatment to form the seamless integrated lampshade. The lampshade adopting the structure and the process can ensure that the lampshade realizes sharp edge effect, is clean and tidy as a whole, has stable size and uniform light transmission, is not loosened and cracked after being used for a long time, and meets the requirements of quality stability and consistency of mass production products.

Drawings

FIG. 1 is a schematic diagram of a bezel-less panel light housing according to one of the prior art;

FIG. 2 is a schematic diagram of a bezel-less panel light housing according to one of the prior art;

FIG. 3 is a schematic diagram of a second prior art frameless panel lamp housing;

FIG. 4 is a schematic diagram of a prior art frameless panel lamp housing;

FIG. 5 is a front view of a blank with a notch (cutting step) in a first step of the present invention;

FIG. 6 is a perspective view of FIG. 5;

FIG. 7 is an enlarged view of portion A of FIG. 6;

FIG. 8 is a side view of FIG. 6 after side bending (bending step);

FIG. 9 is a perspective view of FIG. 8;

FIG. 10 is an enlarged view of portion B of FIG. 9;

FIG. 11 is a schematic view of the bonding and fixing process of the L-shaped edge strip in the seam sealing step;

FIG. 12 is an enlarged view of portion C of FIG. 11;

FIG. 13 is a schematic view of a hot-melt welding structure in a seam sealing step;

FIG. 14 is a front view of the blank at the second slitting step according to the embodiment of the present invention;

FIG. 15 is a perspective view of FIG. 14;

FIG. 16 is a side view of the side of FIG. 14 after being bent (bending step);

FIG. 17 is a perspective view of FIG. 16;

FIG. 18 is an enlarged view of portion D of FIG. 17;

FIG. 19 is a schematic view of the bonding and fixing process of the L-shaped edge strip in the second seam sealing step according to the embodiment of the present invention;

FIG. 20 is an enlarged view of section E of FIG. 19;

FIG. 21 is a front view of a blank in a three-step process according to an embodiment of the present invention;

FIG. 22 is a side view of FIG. 21 after being bent (bending step)

FIG. 23 is a structural diagram of a lampshade according to the present invention;

FIG. 24 is a perspective view of FIG. 23;

FIG. 25 is the structural diagram (II) of the lampshade of the present invention

FIG. 26 is a schematic view of the lamp housings of FIG. 25 assembled together;

FIG. 27 is a schematic view of a 90 degree V-shaped groove formed in the surface of a blank with its side edge connected to the main body of the blank;

FIG. 28 is an enlarged view of a 90V-shaped groove formed on the surface of a blank with its side edge connected to the main body of the blank.

Detailed Description

The invention will be further described with reference to the accompanying drawings and specific embodiments so as to more clearly understand the technical idea of the invention claimed.