阅读说明：本技术 一种防爆阻燃型压敏电阻及其自动化生产方法 (Explosion-proof flame-retardant piezoresistor and automatic production method thereof ) 是由 俞兴华 陈石 陈飞龙 于 2019-11-08 设计创作，主要内容包括：本发明公开一种防爆阻燃型压敏电阻及其自动化生产方法,涉及压敏电阻技术领域,包括压敏电阻本体和设置在压敏电阻本体外部的防爆阻燃外壳,外壳包括通过卡扣结构相互扣合的两个相同壳体,两个壳体组合形成具有开口的空腔,压敏电阻本体位于空腔中且被两个壳体所夹紧,压敏电阻本体的两个引脚从两个壳体的结合处穿出,压敏电阻本体和两个壳体之间的空隙中填充有绝缘物,绝缘物从空腔开口处填入空腔,外壳上设有用于封堵空腔开口的封堵物。本发明提供的防爆阻燃型压敏电阻的两个壳体设置成形状相同,便于注塑成型和物料管理,只需设计一款型腔,减少开模成本。外壳采用卡扣结构拼合而成,便于组装。(The invention discloses an explosion-proof flame-retardant piezoresistor and an automatic production method thereof, and relates to the technical field of piezoresistors. The two shells of the explosion-proof flame-retardant piezoresistor are arranged to have the same shape, so that the injection molding and the material management are facilitated, only one type of cavity needs to be designed, and the die sinking cost is reduced. The shell is formed by splicing a buckle structure, so that the assembly is convenient.)

1. An explosion-proof flame retardant varistor is characterized in that: including the piezo-resistor body and set up at the outside explosion-proof fire-retardant shell of piezo-resistor body, the shell includes two the same casings through the mutual lock of buckle structure, two casing combination forms and has the open-ended cavity, the piezo-resistor body is arranged in the cavity and is pressed from both sides tightly by two casings, two pins of piezo-resistor body are worn out from the combination department of two casings, it has the insulator to fill in the space between piezo-resistor body and two casings, the cavity is filled in from the cavity opening part to the insulator, be equipped with on the shell and be used for shutoff cavity open-ended shutoff thing.

2. The explosion-proof flame-retardant varistor according to claim 1, characterized in that: the opening of the cavity is a sand filling hole formed in the shell, the plugging object is sealing glue used for plugging the sand filling hole, and an elastic barrier strip used for supporting the sealing glue to prevent the sealing glue from leaking into the cavity is arranged in the sand filling hole.

3. The explosion-proof flame-retardant varistor according to claim 2, characterized in that: each shell is provided with at least one sand filling hole or the joint of the two shells is spliced to form the sand filling hole.

4. The explosion-proof flame-retardant varistor according to claim 2, characterized in that: the sealing glue is UV optical glue.

5. The explosion-proof flame-retardant varistor according to claim 1, characterized in that: the two shells are provided with guide posts and guide holes, and the guide posts of the two shells are matched with the guide holes.

6. The explosion-proof flame-retardant varistor according to claim 1, characterized in that: the edge of casing is equipped with two breachs, and the breach of two casings corresponds the amalgamation and forms two through-holes that two pins of supplying the piezo-resistor body passed, and the interval of two through-holes equals the interval of two pins of piezo-resistor body.

7. The explosion-proof flame-retardant varistor according to claim 1, characterized in that: the plugging object is a sealing cover, the sealing cover is combined with the two shells through a buckle structure, and the combination part of the sealing cover and each shell is fixed through ultrasonic welding.

8. The explosion-proof flame-retardant varistor according to any one of claims 1 to 7, wherein: and limiting ribs for clamping the piezoresistor body are arranged in the shell.

9. The explosion-proof flame-retardant varistor according to claim 8, wherein: the joint of the two shells is fixed by ultrasonic welding.

10. An automatic production method of an explosion-proof flame-retardant piezoresistor is characterized by comprising the following steps:

(1) producing a paper tape carrier with a piezoresistor body through an automatic piezoresistor production line;

(2) automatically feeding the plastic shell by adopting a vibrating disc;

(3) after the paper tape carrier is positioned, the installation and the limiting of the shell and the piezoresistor body are realized on line, after the piezoresistor body is limited and fixed through the two shells, the two shells are welded by ultrasonic waves, the two shells are welded to form a shell with a sand filling hole, and an elastic barrier strip is arranged in the sand filling hole;

(4) filling quartz sand into the cavity of the shell from a sand filling hole on the shell, and restoring the elastic barrier strip to the original shape after sand filling is finished;

(5) sealing the sand filling hole by using UV (ultraviolet) optical cement;

(6) and finally, automatically cutting off the pins of the piezoresistor body and packaging.

Technical Field

The invention relates to the technical field of piezoresistors, in particular to an explosion-proof flame-retardant piezoresistor and an automatic production method thereof.

Background

The piezoresistor is used as a passive protection element, and in the process of circuit use, if abnormal voltage fluctuation conditions are met, the piezoresistor starts protection action, if abnormal fluctuation energy exceeds the load of the piezoresistor, the piezoresistor is finally exploded and damaged, and the piezoresistor can be ignited and burnt, and the piezoresistor body explodes, body fragments can be sputtered around, so that unpredictable damage can be caused to the whole machine of a client.

Disclosure of Invention

The invention aims to provide an explosion-proof flame-retardant piezoresistor which is convenient to assemble, and the piezoresistor is packaged in an explosion-proof flame-retardant shell by utilizing the internal space of the explosion-proof flame-retardant shell, so that the aim of explosion-proof flame retardance is fulfilled, and potential safety hazards are reduced.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides an explosion-proof fire-retardant type piezo-resistor, including the piezo-resistor body with set up at the outside explosion-proof fire-retardant shell of piezo-resistor body, the shell includes two the same casings through the mutual lock of buckle structure, two casing combination forms and has the open-ended cavity, the piezo-resistor body is arranged in the cavity and is pressed from both sides tightly by two casings, two pins of piezo-resistor body are worn out from the combination department of two casings, it has the insulator to fill in the space between piezo-resistor body and two casings, the cavity is filled into from the cavity opening part to the insulator, be equipped with on the shell and be used for shutoff cavity open-ended shutoff thing.

Preferably, the opening of the cavity is a sand filling hole formed in the shell, the plugging object is sealing glue used for plugging the sand filling hole, and an elastic barrier strip used for supporting the sealing glue to prevent the sealing glue from leaking into the cavity is arranged in the sand filling hole.

Preferably, each shell is provided with at least one sand filling hole or the joint of the two shells is spliced to form one sand filling hole.

Preferably, the sealing glue is UV optical glue.

Preferably, the two shells are provided with guide posts and guide holes, and the guide posts and the guide holes of the two shells are matched.

Preferably, the edge of the casing is provided with two notches, the notches of the two casings are correspondingly spliced to form two through holes for the two pins of the piezoresistor body to pass through, and the distance between the two through holes is equal to the distance between the two pins of the piezoresistor body.

Preferably, the blocking object is a sealing cover, the sealing cover is combined with the two shells through a buckle structure, and the combination part of the sealing cover and each shell is fixed through ultrasonic welding.

Preferably, the shell is internally provided with a limiting rib for clamping the piezoresistor body.

Preferably, the joint of the two housings is fixed by ultrasonic welding.

The invention also aims to provide an automatic production method of the explosion-proof flame-retardant piezoresistor, which comprises the following steps:

(1) producing a paper tape carrier with a piezoresistor body through an automatic piezoresistor production line;

(2) automatically feeding the plastic shell by adopting a vibrating disc;

(3) after the paper tape carrier is positioned, the installation and the limiting of the shell and the piezoresistor body are realized on line, after the piezoresistor body is limited and fixed through the two shells, the two shells are welded by ultrasonic waves, the two shells are welded to form a shell with a sand filling hole, and an elastic barrier strip is arranged in the sand filling hole;

(4) filling quartz sand into the cavity of the shell from a sand filling hole on the shell, and restoring the elastic barrier strip to the original shape after sand filling is finished;

(5) sealing the sand filling hole by using UV (ultraviolet) optical cement;

(6) and finally, automatically cutting off the pins of the piezoresistor body and packaging.

Compared with the prior art, the invention has the following advantages:

the two shells of the explosion-proof flame-retardant piezoresistor are arranged to have the same shape, so that the injection molding and the material management are facilitated, only one type of cavity needs to be designed, and the die sinking cost is reduced. The shell is formed by splicing a buckle structure, so that the assembly is convenient. The joint of the shell is further fixed by ultrasonic welding, so that the explosion-proof structure has a good explosion-proof effect, the damage to the whole machine of a client caused by the fact that fragments of the piezoresistor body explode splash is avoided, and the use safety of the product is effectively improved.

Drawings

FIG. 1 is a schematic perspective view of an embodiment of an explosion-proof and flame-retardant varistor of the present invention;

FIG. 2 is a schematic perspective view of another embodiment of an explosion-proof and flame-retardant varistor of the present invention;

FIG. 3 is another perspective view of the explosion-proof and flame-retardant varistor of FIG. 2;

FIG. 4 is a further angled perspective view of the explosion-proof, flame-retardant varistor of FIG. 2;

FIG. 5 is an exploded view of the explosion-proof and flame-retardant varistor of FIG. 2;

FIG. 6 is an installation diagram of the internal structure of the explosion-proof and flame-retardant varistor in FIG. 2;

FIG. 7 is a perspective view of the housing of the explosion-proof, flame-retardant varistor of FIG. 2;

FIG. 8 is a schematic perspective view of a varistor in accordance with yet another embodiment of the present invention;

FIG. 9 is an exploded view of the explosion-proof and flame-retardant varistor of FIG. 8;

FIG. 10 is a schematic view of the weld locations of the varistor body and the paper tape with leads;

FIG. 11 is a schematic illustration of a paper tape carrier formed by encapsulation after soldering of the varistor body and leads;

fig. 12 is a schematic diagram of a finished material belt of the explosion-proof flame-retardant piezoresistor.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

Referring to fig. 1 to 9, the invention discloses an explosion-proof and flame-retardant varistor, which comprises a varistor body 1 and an explosion-proof and flame-retardant housing disposed outside the varistor body 1, wherein the housing includes two identical casings 2 fastened to each other by a fastening structure, the two casings 2 are combined to form a cavity with an opening, the varistor body 1 is disposed in the cavity and clamped by the two casings 2, two pins 11 of the varistor body 1 penetrate through a joint of the two casings 2, an insulator is filled in a gap between the varistor body 1 and the two casings 2, the insulator is filled in the cavity from the opening of the cavity, and a blocking object for blocking the opening of the cavity is disposed on the housing.

In order to further achieve the fixation between the two housings 2 for obtaining a better explosion-proof effect, it is preferable that the joint of the two housings 2 is fixed by ultrasonic welding. The shells 2 are injection-molded explosion-proof flame-retardant plastic shells, preferably PBT plastic shells, the edges of the joints of the two shells 2 are both provided with hooks 5 and clamping grooves 6, and the hooks 5 and the clamping grooves 6 of the two shells 2 are correspondingly matched with each other. In order to ensure that the two shells are exactly buckled, preferably, the two shells are provided with guide posts 12 and guide holes 13, the guide posts 12 of the two shells are matched with the guide holes 13, the guide posts 12 are preferably in a circular truncated cone structure, and the height of the guide posts 12 is higher than that of the clamping hooks 5.

In some embodiments of the present invention, the opening of the cavity is a sand filling hole 3 disposed on the housing, the blocking object is sealing glue for blocking the sand filling hole 3, an elastic barrier 31 for supporting the sealing glue to prevent the sealing glue from leaking into the cavity is disposed in the sand filling hole 3, and the insulator is filled into the cavity through the sand filling hole 3. Preferably, the elastic barrier strips 31 are integrally formed with the housing 2, the elastic barrier strips 31 are umbrella-shaped, and each elastic barrier strip 31 extends from the wall of the sand filling hole 3 to the center of the hole. Preferably, the insulator is quartz sand, and the sealing glue is UV optical glue.

Preferably, the sand filling hole 3 is arranged at the upper end of the housing, and the two pins 11 of the varistor body 1 penetrate out of the housing from the lower end of the housing, specifically, penetrate out of the joint of the lower ends of the two housings. Two notches 14 are arranged at the lower end edge of each shell 2, the notches 14 of the two shells 2 are correspondingly spliced to form two through holes for the two pins 11 of the piezoresistor body 1 to pass through, and the distance between the two through holes is equal to the distance between the two pins 11 of the piezoresistor body 1.

Each shell 2 is provided with at least one sand filling hole 3 or the joint of the two shells 2 is spliced to form one sand filling hole 3. Fig. 1 shows an embodiment in which each casing 2 is provided with one sand filling hole 3 at the upper end, and fig. 2 to 7 show an embodiment in which two casing 2 joints are spliced to form one sand filling hole 3. The sand filling holes can also be arranged on the left side, the right side or the front side and the rear side of the shell.

Preferably, the housing 2 is provided internally with a spacing rib 7 for clamping the varistor body 1. The limiting ribs 7 are perpendicular to the pins 11 of the piezoresistor body 1, and only two sides of the piezoresistor body 1 are clamped, so that quartz sand can penetrate through gaps between the limiting ribs 7 to fill the lower part of the cavity.

Aiming at the explosion-proof flame-retardant piezoresistor, the automatic production method comprises the following steps:

(1) as shown in fig. 10 and 11, the paper tape carrier with the varistor body 1 is produced by an automatic varistor production line;

(2) a vibration disc is adopted to automatically feed the plastic shell 2;

(3) after the paper tape carrier is positioned, the installation and the limiting of the shell 2 and the piezoresistor body 1 are realized on line, after the piezoresistor body 1 is limited and fixed by the two shells 2, the shells 2 are welded by ultrasonic waves, the two shells are welded to form a shell with a sand filling hole, and an elastic barrier strip is arranged in the sand filling hole;

(4) a needle tube is inserted into a sand filling hole 3 on a shell for filling quartz sand, and an elastic barrier strip of the sand filling hole 3 is restored to the original state after the needle tube is pulled out;

(5) sealing the sand filling holes 3 by using UV (ultraviolet) optical cement to form a finished material belt shown in figure 12;

(6) and finally, automatically cutting off the pins 11 of the piezoresistor body 1 to separate the finished product from the material belt, and packaging.

In an embodiment of the present invention, the upper end of the outer shell is open, the blocking object is a sealing cover 4, and the sealing cover 4 can be combined with the two shells 2 by clamping, or heat sealing or glue sealing, and then fixed by ultrasonic welding. In one embodiment, two long edges of the sealing cover 4 are provided with hooks 5, the upper ends of the two shells 2 are provided with clamping grooves 6 matched with the hooks 5 of the sealing cover 4, and the sealing cover 4 and the two shells 2 are fastened through a buckle structure and then fixed through ultrasonic welding. The sealing cover 4 can also be used for replacing the UV glue-bonding sand filling hole 3.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.