阅读说明：本技术 密封条 (Sealing strip ) 是由 赵彩霞 郎雄 骆震宇 于 2019-11-15 设计创作，主要内容包括：本发明提供了一种密封条,该密封条包括：密封上部,横截面呈锥形；密封中部,位于所述密封上部的下方,横截面呈矩形,具有一个贯穿通孔；密封下部,位于所述密封中部的下方,两侧分别具有一个燕尾槽,其中,所述密封上部、所述密封中部以及所述密封下部为一体成型。利用机床二次锁模功能,第一次合模合到分型面间隙1mm位置时开始抽真空,当真空度达到要求后,持续抽真空并进行二次锁模,模具对密封条进行挤压,贯穿通孔与燕尾槽的设计,一方面增加了密封条的压缩性和形变空间,使得密封效果更好,另一方面便于排出模具型腔内的大量气体,保证抽真空效果；另外,该密封条的结构独立,对模具结构无影响,经济性好,实用性高。(The present invention provides a sealing tape, comprising: the cross section of the upper part of the seal is conical; the sealing middle part is positioned below the sealing upper part, has a rectangular cross section and is provided with a through hole; and the sealing lower part is positioned below the sealing middle part, and two sides of the sealing lower part are respectively provided with a dovetail groove, wherein the sealing upper part, the sealing middle part and the sealing lower part are integrally formed. By utilizing the secondary mould locking function of the machine tool, vacuumizing is started when the first mould closing is carried out to the position of 1mm of the parting surface gap, when the vacuum degree meets the requirement, vacuumizing is continuously carried out and secondary mould locking is carried out, the sealing strip is extruded by the mould, and the design of the through hole and the dovetail groove is penetrated, so that the compressibility and deformation space of the sealing strip are increased, the sealing effect is better, and a large amount of gas in the mould cavity is conveniently discharged, and the vacuumizing effect is ensured; in addition, the sealing strip has an independent structure, no influence on a mold structure, good economical efficiency and high practicability.)

1. The utility model provides a sealing strip for optics silica gel spotlight ware process of moulding plastics and realize evacuation and sealed with the lathe cooperation, its characterized in that includes:

the cross section of the upper part of the seal is conical;

the sealing middle part is positioned below the sealing upper part, has a rectangular cross section and is provided with a through hole;

the lower part of the seal is positioned below the middle part of the seal, both sides of the lower part of the seal are respectively provided with a dovetail groove,

wherein the upper sealing part, the middle sealing part and the lower sealing part are integrally formed.

2. The weatherstrip according to claim 1, wherein:

and all end angles of the integrally formed sealing strip are set to be in circular arc transition.

3. The weatherstrip according to claim 2, wherein:

wherein, the radius of the circular arc of the fillet of the conical top end of the upper part of the seal is 1 mm.

4. The weatherstrip according to claim 3, wherein:

wherein the cross section of the middle part of the seal is rectangular,

the through hole is oval and is positioned in the center of the rectangular cross section.

5. The weatherstrip according to claim 4, wherein:

wherein the arc radiuses of two rounded corners connected with the sealing upper part in the middle of the seal are 0.8mm,

the arc radiuses of two rounded corners connected with the lower part of the seal at the middle part of the seal are 0.5 mm.

6. The weatherstrip according to claim 5, wherein:

wherein the width of the lower sealing part is greater than the width of the middle sealing part.

7. The weatherstrip according to claim 6, wherein:

wherein, the width of the lower part of the seal is designed to be 0.5mm larger than the width of the middle part of the seal at two sides respectively.

8. The weatherstrip according to claim 7, wherein:

wherein each of the dovetail slots has a fillet and a bullnose,

the circular arc radius of the fillet is 0.15mm, and the circular arc radius of the bullnose is 0.25 mm.

9. The weatherstrip according to claim 8, wherein:

wherein, the radius of the circular arcs of the fillets at the two bottom ends of the lower part of the seal is 1.2 mm.

10. The weatherstrip according to claim 9, wherein:

wherein the sealing strip is in a long strip shape,

the injection molding material of the sealing strip is R354 silica gel.

Technical Field

The invention belongs to the technical field of automobile lamp manufacturing, and particularly relates to a sealing strip.

Background

The optical silica gel condenser is generally made of high-transparency silica gel; the high-transparency silica gel has the advantages of good heat resistance, high optical transmittance, good yellowing resistance, good fluidity, easy molding of various sharp corners and the like, and is gradually used for manufacturing optical components. The qualified condenser needs to meet the requirements of smooth surface, no defects such as cracks, bubbles, shriveling, flow marks and the like. Since the condenser is very close to the LED, if the product has problems such as flash and bubbles, the optical performance of the component is directly affected. How to solve the bubbles and the flash is the key for manufacturing parts.

According to the material characteristics of the silica gel, the overflow value is 3-5 um, so that the exhaust gap of the mold can not exceed 3um at most. The weight of the silica gel condenser is about 7g generally, and according to a theoretical exhaust formula, the exhaust time of a part of 7g can be calculated to be 31.6s, which is impossible to produce in actual production.

Because the overflow edge value of the silica gel product is very small, the exhaust gap of the parting surface of the silica gel mold is very small, and the gas exhaust efficiency is very low, so that the gas is exhausted by a vacuumizing mode in the prior art.

As shown in the following figure 4, the traditional vacuumizing sealing strip adopts a round solid sealing strip 1, so that the compressibility is low, and the sealing effect is not ideal; and the parting surface exhaust gap is also very small, the vacuum pumping effect is not good, and the product bubbles are also obvious.

Disclosure of Invention

The present invention is made to solve the above problems, and an object of the present invention is to provide a sealing strip which can ensure quick and effective discharge of trapped air during a vacuum-pumping process and has a better sealing effect.

The invention provides a sealing strip, which is used for the injection molding process of an optical silica gel condenser and is matched with a machine tool to realize vacuum pumping and sealing, and is characterized by comprising the following components: the cross section of the upper part of the seal is conical; the sealing middle part is positioned below the sealing upper part, has a rectangular cross section and is provided with a through hole; and the sealing lower part is positioned below the sealing middle part, and two sides of the sealing lower part are respectively provided with a dovetail groove, wherein the sealing upper part, the sealing middle part and the sealing lower part are integrally formed.

In the sealing strip provided by the invention, the sealing strip can also have the characteristic that all end angles of the sealing strip after being integrally formed are provided with circular arc transition.

In the weather strip provided by the present invention, there may be further provided a feature wherein the radius of the circular arc of the rounded corner of the tapered tip of the upper portion of the seal is 1 mm.

In the sealing strip provided by the invention, the sealing middle part may have a rectangular cross section, and the through hole may have an oval shape and may be located at the center of the rectangular cross section.

In the weather strip according to the present invention, there may be further provided a feature wherein the two rounded corners of the seal central portion connected to the seal upper portion have a circular arc radius of 0.8mm, and the two rounded corners of the seal central portion connected to the seal lower portion have a circular arc radius of 0.5 mm.

In the sealing tape provided by the present invention, there may be further provided a feature in which the width of the sealing lower portion is larger than the width of the sealing middle portion.

In the weather strip according to the present invention, there may be further provided a feature wherein the width of the lower seal portion is designed such that both sides are respectively larger than the width of the middle seal portion by 0.5 mm.

In the seal strip according to the present invention, there may be further provided a feature wherein each of the dovetail grooves has a fillet and a bullnose, the fillet having a circular arc radius of 0.15mm, and the bullnose having a circular arc radius of 0.25 mm.

In the weather strip provided by the present invention, there may be further provided a feature wherein the radius of the rounded circular arcs of the two bottom ends of the seal lower portion is 1.2 mm.

The sealing strip provided by the invention can also have the characteristic that the sealing strip is long and the injection molding material of the sealing strip is R354 silica gel.

Action and Effect of the invention

According to the sealing strip, by utilizing the secondary mould locking function of a machine tool, vacuumizing is started when the first mould locking is carried out to the position of 1mm of the parting surface gap, and at the moment, the mould is contacted with the conical top end of the sealing upper part of the sealing strip; after the vacuum degree meets the requirement, the sealing strip is continuously vacuumized and secondarily locked, the sealing strip is extruded by the mold, and the sealing strip penetrates through the through hole and the dovetail groove, so that the compressibility and deformation space of the sealing strip are increased, the sealing effect is better, a large amount of gas in a mold cavity is conveniently discharged, and the vacuumizing effect is ensured; in addition, the sealing strip has an independent structure, no influence on a mold structure, good economical efficiency and high practicability.

Drawings

FIG. 1 is a schematic cross-sectional view of a sealing tape in an embodiment of the present invention.

FIG. 2 is a schematic view showing a first mold-locking state of the sealing tape applied to the machine tool according to the embodiment of the present invention.

FIG. 3 is a schematic view showing a second mold-locking state of the sealing tape applied to the machine tool according to the embodiment of the present invention.

Fig. 4 is a schematic view of the clamping state of the sealing strip applied to the machine tool in the prior art.

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

< example >

FIG. 1 is a schematic cross-sectional view of a sealing tape in an embodiment of the invention; FIG. 2 is a schematic view showing a first mold-locking state of the sealing tape applied to the machine tool according to the embodiment of the present invention; FIG. 3 is a schematic view showing a second mold-locking state of the sealing tape applied to the machine tool according to the embodiment of the present invention.

As shown in fig. 1, 2 and 3, in this embodiment, the sealing strip 100 is used in an injection molding process of the optical silica gel condenser 200, and is matched with a machine tool to realize vacuum sealing, so as to solve the problem of trapped air generated in the injection molding process of the optical silica gel condenser 200 and help to quickly discharge the trapped air.

The sealing tape 100 is an elongated shape as a whole, and includes: a sealing upper part 10, a sealing middle part 20 and a sealing lower part 30. In the present embodiment, the sealing upper portion 10, the sealing middle portion 20, and the sealing lower portion 30 are integrally formed to form the sealing strip 100, and the injection molding material of the sealing strip 100 is R354 silicone rubber manufactured by wacker, germany.

As shown in fig. 1, the sealing upper portion 10 is tapered in cross-section.

The middle sealing part 20 is a hollow cylindrical structure, is located below the upper sealing part 10, and has a rectangular cross section and a through hole 21 at a position corresponding to the center of the cross section.

The lower seal portion 30 is located below the middle seal portion 20, and has one dovetail groove 31 on each side thereof, i.e., a total of two dovetail grooves 31.

In the present embodiment, all the end corners of the integrally molded weather strip 100 are configured as circular arc transitions.

The method specifically comprises the following steps:

the conical top end 11 of the upper sealing part 10 is in circular arc transition, that is, the end corner of the top end is a rounded corner, and the corresponding circular arc radius is 1 mm.

The cross-section of the seal central portion 20 is rectangular in particular, and the through-hole 21 is oval in shape and is located at the center of the rectangular cross-section.

Two end corners 22 corresponding to the positions where the middle sealing part 20 is connected with the upper sealing part 10 are also in arc transition, that is, the two end corners are also rounded, and the corresponding arc radius is 0.8 mm.

Two end corners 23 corresponding to the connecting position of the middle sealing part 20 and the lower sealing part 30 are also in arc transition, that is, the two end corners are also rounded, and the corresponding arc radius is 0.5 mm.

The width of the lower sealing portion 30 is greater than the width of the middle sealing portion 20 when viewed in cross section, specifically: the width of the lower sealing portion 30 is designed such that both sides are respectively 0.5mm greater than the width of the middle sealing portion 20.

Each dovetail groove 31 of the sealing lower portion 30 has a fillet 32 and a bullnose 33. The fillet 32 has a circular arc radius of 0.15mm, and the fillet 33 has a circular arc radius of 0.25 mm.

The two bottom end corners 34 of the lower sealing portion 30 are also rounded, i.e. the two end corners are rounded, and the radius of the corresponding circular arc is 1.2 mm.

Based on the structure and size of the sealing strip 100, the sealing strip is specifically applied to the injection molding process of an optical silica gel condenser:

in the embodiment, by utilizing the secondary mold locking function of the machine tool, when the first mold locking is carried out to the position of 1mm of the parting surface gap shown in figure 2, the vacuumizing is started; after the vacuum degree meets the requirement, specifically, the machine tool secondary mold locking mold is closed to the glue injection position after vacuumizing for about 3s, and vacuumizing and throwing are continuously performed in the process, as shown in fig. 3, and the parting surface is stuck at the moment.

In the sealing process, when the mold is closed to the state shown in fig. 2 for the first time, the mold is in contact with the conical top end 11 of the upper sealing part 10 of the sealing strip 100, after the vacuumizing is started, the mold extrudes the conical top end 11 during the mold locking for the second time, and the deformation space of the sealing strip 100 is increased by penetrating through the through hole 21 and the dovetail groove 31, so that the sealing effect is better, and on the other hand, a large amount of gas in a mold cavity of the mold is convenient to discharge, and the problem of gas trapping is solved.

After the mold locking is completed, the mold injection molding machine starts to inject the rubber, then the product is vulcanized, and finally the injection molding process is completed after the product is taken.