CN112337731A - Piezoelectric dispensing valve of needle type nozzle - Google Patents
Piezoelectric dispensing valve of needle type nozzle Download PDFInfo
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- CN112337731A CN112337731A CN201910733736.2A CN201910733736A CN112337731A CN 112337731 A CN112337731 A CN 112337731A CN 201910733736 A CN201910733736 A CN 201910733736A CN 112337731 A CN112337731 A CN 112337731A
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- nozzle
- needle
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- dispensing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
- B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
- B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet
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Abstract
The invention discloses a piezoelectric dispensing valve of a needle type nozzle, belonging to the field of fluid dispensing, and the dispensing valve comprises a valve body, a sealing nozzle, an adapter and the needle type nozzle, wherein: piezoelectric ceramics are arranged in the valve body and connected with firing pins; the sealing nozzle is positioned below the firing pin and is connected with the valve body through the upper end of an adapter, the lower end of the adapter is connected with the needle nozzle, and a connecting flow channel for communicating the sealing nozzle and the needle nozzle is formed in the adapter. The piezoelectric dispensing valve is different from the traditional dispensing valve, realizes that the lengthened needle type nozzle is adopted on the piezoelectric dispensing valve, not only solves the problem of dispensing in a narrow space, but also can realize high-precision and high-speed dispensing or gluing.
Description
Technical Field
The invention relates to the field of fluid dispensing, in particular to a piezoelectric dispensing valve of a needle type nozzle.
Background
The dispensing process is widely used in the electronic industry represented by the mobile phone industry, and dispensing can play a role in adhering, sealing and connecting. In the process of dispensing, due to the fluid characteristic of glue, the problems of uneven glue discharging, overflow of the glue, incomplete glue sealing and the like exist in manual glue dispensing, and automatic glue dispensing equipment mainly comprising a glue dispenser is introduced earlier in the industry.
At present, the shell of the mobile phone is mainly made of alloy and engineering plastics. Traditional screw threads and buckles cannot meet the requirements of ultrathin, ultralight and three-dimensional and attractive appearance in the process of producing and assembling the mobile phone, and in order to achieve the appearance characteristics of no gap and flat and thin appearance, glue is increasingly adopted to bond and attach mobile phone components in the process of assembling the mobile phone. The accuracy of the automatic dispenser equipment is therefore undoubtedly the most critical parameter in the manufacture of the handset.
High accuracy, high speed's point gum machine equipment not only can improve production efficiency, and the point is glued accurately, can also guarantee product quality, and further for better realization mill automation, intellectuality, unmanned.
The dispensing valve can be divided into a non-contact dispensing valve and a contact dispensing valve, the non-contact dispensing valve comprises a non-contact piezoelectric dispensing valve and a pneumatic non-contact injection valve, the non-contact piezoelectric dispensing valve is the mainstream equipment in the high-precision dispensing field at present, and the dispensing precision is high, the frequency is high, and the efficiency is high. In some electronic product production, some more intractable some glue dispensing processes can be met, for example, inside narrow and small concave casings such as earphones and chargers, because the spraying of some glue is difficult for the non-contact piezoelectric glue dispensing valve and the pneumatic non-contact spray valve in the prior art, the distance from the nozzle to the workpiece is generally 1-4 mm during work, and when the spraying distance exceeds 4mm, scattered points, track deviation or other defects are easily formed. Therefore, the glue can not be dispensed in narrow and deep gaps or shells in the workpiece.
The traditional contact dispensing valve is a contact pneumatic dispensing valve, can be used for dispensing at a long distance, and the dispensing distance is far greater than that of non-contact dispensing. The contact type pneumatic dispensing valve has the following defects: the dispensing precision is lower than that of piezoelectric non-contact dispensing, the dispensing speed of the glue solution is slow, the consistency of the glue weight is poor, the size of the glue drop is large, the wire drawing is easy, and the needle head is easy to scratch the substrate.
Therefore, the non-contact dispensing valve in the prior art cannot dispense glue for narrow and deep gaps or shells in the workpiece; if the traditional contact type pneumatic dispensing valve is adopted, the dispensing efficiency and the dispensing precision are low, so that the dispensing requirements of special products can not be met.
Disclosure of Invention
In order to solve the technical problems, the invention provides the piezoelectric dispensing valve with the needle type nozzle.
The technical scheme provided by the invention is as follows:
a piezoelectric dispensing valve of a needle nozzle comprises a valve body, a sealing nozzle, an adapter and the needle nozzle, wherein:
piezoelectric ceramics are arranged in the valve body and connected with firing pins; the sealing nozzle is positioned below the firing pin and is connected with the valve body through the upper end of an adapter, the lower end of the adapter is connected with the needle nozzle, and a connecting flow channel for communicating the sealing nozzle and the needle nozzle is formed in the adapter.
Further, the valve body comprises a main valve body and a valve seat connected to the main valve body, the piezoelectric ceramics is arranged in the main valve body, the sealing nozzle is connected with the valve seat through the upper end of the adapter, and a glue supply flow passage leading to the sealing nozzle is arranged in the valve seat.
Further, a nozzle accessory is arranged above the sealing nozzle and sleeved on the firing pin.
Furthermore, the upper part of the needle type nozzle is a connecting part, the connecting part is connected with the lower end of the adapter, the lower part of the needle type nozzle is a needle head, and the connecting part and the needle head are internally provided with an injection channel.
Furthermore, the cross section of the connecting part gradually becomes smaller from top to bottom, the length range of the maximum cross section of the connecting part is 2-15 mm, and the length range of the needle head is 20-40 mm.
Further, the length of the needle head is 30 mm.
Furthermore, the diameter range of the firing pin is 1-3 mm, the tail end impact surface of the firing pin is of a ball head structure, and the sphere diameter range of the ball head structure is 0.5-3 mm.
Further, the piezoelectric ceramic is connected with the firing pin through a displacement amplification mechanism.
The invention has the following beneficial effects:
the piezoelectric dispensing valve provided with the lengthened needle type nozzle is different from a common non-contact piezoelectric injection valve and a traditional contact type pneumatic valve or a screw valve, and integrates some advantages of the contact type nozzle and the piezoelectric injection valve: the invention adopts the needle type long nozzle, can realize long-distance dispensing, and solves the problems of deep groove dispensing or deep groove pointing gluing in narrow space and the like. The piezoelectric dispensing valve has the advantages of high speed and high precision of piezoelectric dispensing, and the dispensing frequency and the size of the glue drops are consistent with the structure of the piezoelectric dispensing valve body. The piezoelectric dispensing valve is different from the traditional dispensing valve, and realizes that the lengthened needle type nozzle is adopted on the piezoelectric dispensing valve, so that the dispensing in a narrow space is solved, and the high-precision and high-speed dispensing or gluing can be realized.
Drawings
Fig. 1 is a schematic view of a piezoelectric dispensing valve of a needle nozzle according to the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a piezoelectric dispensing valve of a needle nozzle, as shown in fig. 1, the dispensing valve comprises a valve body 100, a sealing nozzle 4, an adapter 5 and a needle nozzle 200, wherein:
piezoelectric ceramics are arranged in the valve body 100 and connected with a firing pin 9; the sealing nozzle 4 is positioned below the striker 9, the sealing nozzle 4 is connected with the valve body 100 through the upper end of the adapter 5, the lower end of the adapter 5 is connected with the needle nozzle 200, and the adapter 5 is internally provided with a connecting flow passage 6 for communicating the sealing nozzle 4 and the needle nozzle 200.
The up-down direction of the present invention is the direction shown in fig. 1, that is, the normal working direction of the piezoelectric dispensing valve, and the up-down direction of the present invention only shows the relative positions of the components, and when the placing direction of the piezoelectric dispensing valve is different from that of fig. 1, the corresponding up-down direction is other different directions, but does not affect the expression and the protection scope of the present invention.
The needle type nozzle is an elongated needle type nozzle, long-distance dispensing can be achieved, and deep groove dispensing or deep groove pointing glue spreading in narrow space and the like are achieved. The firing pin reciprocates at a high speed under the drive of piezoelectric ceramics arranged in the valve body, and realizes high-frequency switching with the sealing nozzle, so that the glue solution is precisely distributed into the connecting flow channel, is pushed to enter the elongated needle type nozzle from the connecting flow channel, flows through the elongated needle type nozzle and the elongated needle head at the lower end of the elongated needle type nozzle, and is sprayed to the surface of a bearing medium from a glue hole at the tail end of the needle head.
Before the glue solution reaches the surface of the bearing medium, a secondary spraying process is carried out. Firstly, the glue solution is sprayed out from the fine hole of the sealing nozzle through the interaction between the firing pin of the piezoelectric dispensing valve and the sealing nozzle and enters the interior of the lengthened needle type nozzle through the connecting flow passage to form the first-stage glue solution spraying. Meanwhile, the glue solution entering the elongated needle type nozzle conducts the sprayed pressure wave to the end part of the elongated needle type nozzle, the glue solution near the end part of the elongated needle type nozzle is further quickly sprayed to the surface of a bearing medium to form second-stage glue solution spraying, and the time interval between the two-stage spraying is microsecond magnitude.
The traditional contact type pneumatic dispensing uses the pressure formed by a pneumatic valve or a screw valve to convey glue liquid into a needle type nozzle and jet the glue liquid. That is, the method of the present invention uses the piezoelectric injection method to provide the injection pressure for the needle nozzle, instead of the method of using the air pressure to provide the injection pressure for the needle nozzle by the contact type pneumatic dispensing. The spraying frequency and the size of the glue drops sprayed onto the bearing medium depend on the spraying frequency of the piezoelectric glue dispensing valve and the size of the glue drops sprayed into the elongated needle type nozzle from the first stage of the glue dispensing valve. Because the piezoelectric jet has the advantages of high speed and high precision, the dispensing frequency and the size of the glue drop of the invention are basically consistent with the structure of the piezoelectric dispensing valve body, and are superior to pneumatic dispensing.
In summary, the piezoelectric dispensing valve with an elongated needle nozzle of the present invention, unlike the conventional non-contact piezoelectric injection valve and the conventional contact pneumatic valve or screw valve, integrates some advantages of the contact nozzle and the piezoelectric injection valve: the invention adopts the needle type long nozzle, can realize long-distance dispensing, and solves the problems of deep groove dispensing or deep groove pointing gluing in narrow space and the like. The piezoelectric dispensing valve has the advantages of high speed and high precision of piezoelectric dispensing, and the dispensing frequency and the size of the glue drops are consistent with the structure of the piezoelectric dispensing valve body. The piezoelectric dispensing valve is different from the traditional dispensing valve, and realizes that the lengthened needle type nozzle is adopted on the piezoelectric dispensing valve, so that the dispensing in a narrow space is solved, and the high-precision and high-speed dispensing or gluing can be realized.
The invention is not limited to the specific structural form of the valve body, as long as the bearing of the piezoelectric ceramics, the firing pin and other components is realized, and a preferred embodiment is given as follows: the valve body 100 comprises a main valve body 1 and a valve seat 2 connected to the main valve body 1, piezoelectric ceramics are arranged in the main valve body 1, a sealing nozzle 4 is connected with the valve seat 2 through the upper end of an adapter 5, a glue supply flow channel 3 leading to the sealing nozzle 4 is arranged in the valve seat 2, the valve seat is connected with a glue supply device, and glue is conveyed to the sealing nozzle through the glue supply flow channel.
Furthermore, a nozzle attachment 10 may be provided above the sealing nozzle 4, the nozzle attachment 10 being fitted over the striker 9. The nozzle accessory, the sealing nozzle and the adapter are matched to fix the sealing nozzle, and a channel for the firing pin to pass through is arranged in the nozzle accessory, so that the firing pin is guided, the glue solution is prevented from leaking, and the sealing effect is achieved.
The shape structure of the needle nozzle of the present invention can be flexibly designed according to the application space, in one embodiment, the upper part of the needle nozzle 200 is a connecting part 7, the connecting part 7 is connected with the lower end of the adapter 5, the lower part of the needle nozzle 200 is a needle 8, the connecting part 7 and the needle 8 are provided with injection channels, and the tail end of the needle is provided with a glue outlet.
The elongated needle type nozzle is composed of two parts, wherein the upper part is designed into a part connected with the connecting part, and the lower part is designed into an elongated tube, so that precise dispensing in a long distance and a narrow space is realized.
Preferably, the connecting portion 7 has a cross section gradually decreasing from top to bottom, i.e., the connecting portion may have an inverted cone shape, may have a polygonal shape, or may have a polygonal tapered shape. The maximum cross section length range of the connecting part can be 2-15 mm, when the connecting part is in an inverted cone shape, the cross section length refers to the outer diameter of the cross section, and when the connecting part is in a polygonal cone shape, the cross section length refers to the maximum diagonal length of the polygonal cone shape.
The length range of the needle head can be 20-40 mm, and preferably, the length of the needle head can reach 30 mm.
The firing pin and the sealing nozzle are dispensing terminal execution elements, the diameter range of the firing pin can be 1-3 mm, the tail end impact surface of the firing pin is preferably of a ball head structure, and the sphere diameter range of the ball head structure can be 0.5-3 mm.
In order to amplify and output the displacement of the piezoelectric ceramics, the piezoelectric ceramics is connected with the firing pin through a displacement amplifying mechanism. The piezoelectric ceramic drives the firing pin to reciprocate at high speed through a displacement amplifying mechanism to realize liquid distribution and output.
In the invention, the connection between the adapter and the valve body and the connection between the volume adapter and the needle nozzle can adopt a threaded connection mode and carry out sealing treatment.
In view of the foregoing, the present invention provides an elongated needle nozzle device dedicated for a piezo-jet valve, which is mainly used for electronic assembly operations such as dispensing sealing, bonding, surface coating, fixed-point encapsulation, and high-precision underfill dispensing in high-end manufacturing industries. The application industries are distributed throughout LED, SMT, household appliances, solar energy, automobile electronics, military industry of mobile phone industry, semiconductors, medical appliances and the like.
The invention connects the lengthened needle type nozzle to the valve body of the existing piezoelectric injection valve, forms the piezoelectric dispensing valve structure of the overlong nozzle, combines the characteristics of the needle type long nozzle of contact type pneumatic dispensing and the advantages of high speed and high precision of piezoelectric dispensing, realizes long-distance dispensing by adopting the long nozzle, and has high injection speed and dispensing precision. The piezoelectric dispensing valve is combined with the lengthened needle type nozzle, so that the advantages of the piezoelectric dispensing valve and the advantages of the contact dispensing valve are exerted, the special dispensing working condition is met, the adaptability is strong, the application occasion of the dispensing valve is expanded, and better economic benefit can be obtained.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a piezoelectric dispensing valve of needle nozzle which characterized in that, includes valve body, sealed nozzle, adapter and needle nozzle, wherein:
piezoelectric ceramics are arranged in the valve body and connected with firing pins; the sealing nozzle is positioned below the firing pin and is connected with the valve body through the upper end of an adapter, the lower end of the adapter is connected with the needle nozzle, and a connecting flow channel for communicating the sealing nozzle and the needle nozzle is formed in the adapter.
2. The piezoelectric dispensing valve for a needle nozzle according to claim 1, wherein the valve body includes a main valve body and a valve seat connected to the main valve body, the piezoelectric ceramic is disposed in the main valve body, the sealing nozzle is connected to the valve seat through an upper end of an adapter, and a glue supply passage leading to the sealing nozzle is provided in the valve seat.
3. The piezoelectric dispensing valve for needle nozzles of claim 2, wherein a nozzle attachment is provided above the sealing nozzle, and the nozzle attachment is fitted over the firing pin.
4. The piezoelectric dispensing valve for needle-type nozzles according to any one of claims 1 to 3, wherein the upper part of the needle-type nozzle is a connecting part, the connecting part is connected with the lower end of the adapter, the lower part of the needle-type nozzle is a needle, and the connecting part and the needle are provided with an injection channel therein.
5. The piezoelectric dispensing valve of a needle nozzle according to claim 4, wherein the connecting portion has a cross section gradually decreasing from top to bottom, the maximum cross-sectional length of the connecting portion ranges from 2 mm to 15mm, and the length of the needle ranges from 20 mm to 40 mm.
6. The piezoelectric dispensing valve of a needle nozzle according to claim 5, wherein the length of the needle is 30 mm.
7. The piezoelectric dispensing valve of a needle nozzle according to claim 5, wherein the diameter of the firing pin is in a range of 1 to 3mm, the striking surface at the tail end of the firing pin is in a ball head structure, and the ball diameter of the ball head structure is in a range of 0.5 to 3 mm.
8. The piezoelectric dispensing valve of a needle nozzle according to claim 4, wherein the piezoelectric ceramic is connected to the striker through a displacement amplification mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733736.2A CN112337731A (en) | 2019-08-09 | 2019-08-09 | Piezoelectric dispensing valve of needle type nozzle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910733736.2A CN112337731A (en) | 2019-08-09 | 2019-08-09 | Piezoelectric dispensing valve of needle type nozzle |
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| Publication Number | Publication Date |
|---|---|
| CN112337731A true CN112337731A (en) | 2021-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910733736.2A Pending CN112337731A (en) | 2019-08-09 | 2019-08-09 | Piezoelectric dispensing valve of needle type nozzle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318481A (en) * | 2022-10-12 | 2022-11-11 | 常州铭赛机器人科技股份有限公司 | Control method of high-precision piezoelectric spray valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204523408U (en) * | 2015-01-20 | 2015-08-05 | 北京派和科技股份有限公司 | Based on injection valve and the point glue equipment of Piezoelectric Ceramic and flexible amplification mechanism |
| CN105903640A (en) * | 2016-05-26 | 2016-08-31 | 努比亚技术有限公司 | Dispensing needle head and dispensing machine |
| CN108722788A (en) * | 2017-04-25 | 2018-11-02 | 深圳市腾盛工业设备有限公司 | A kind of piezoelectric ceramics spray site glue valve |
| KR20190017386A (en) * | 2017-08-11 | 2019-02-20 | 우재종 | A jetting valve |
| CN209189026U (en) * | 2018-10-15 | 2019-08-02 | 北京派和科技股份有限公司 | Split type nozzle and piezo jet valve |
-
2019
- 2019-08-09 CN CN201910733736.2A patent/CN112337731A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204523408U (en) * | 2015-01-20 | 2015-08-05 | 北京派和科技股份有限公司 | Based on injection valve and the point glue equipment of Piezoelectric Ceramic and flexible amplification mechanism |
| CN105903640A (en) * | 2016-05-26 | 2016-08-31 | 努比亚技术有限公司 | Dispensing needle head and dispensing machine |
| CN108722788A (en) * | 2017-04-25 | 2018-11-02 | 深圳市腾盛工业设备有限公司 | A kind of piezoelectric ceramics spray site glue valve |
| KR20190017386A (en) * | 2017-08-11 | 2019-02-20 | 우재종 | A jetting valve |
| CN209189026U (en) * | 2018-10-15 | 2019-08-02 | 北京派和科技股份有限公司 | Split type nozzle and piezo jet valve |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115318481A (en) * | 2022-10-12 | 2022-11-11 | 常州铭赛机器人科技股份有限公司 | Control method of high-precision piezoelectric spray valve |
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Application publication date: 20210209 |