CN112122060A

CN112122060A - Miniature precise dispensing valve, dispensing device and dispensing method

Info

Publication number: CN112122060A
Application number: CN201910553932.1A
Authority: CN
Inventors: 卢国明; 张涛; 翟志豪; 曾金城; 江岱平
Original assignee: Shenzhen Tengsheng Precision Equipment Co ltd
Current assignee: Shenzhen Tengsheng Precision Equipment Co ltd
Priority date: 2019-06-25
Filing date: 2019-06-25
Publication date: 2020-12-25

Abstract

The embodiment of the application belongs to the field of precise dispensing, and relates to a miniature precise dispensing valve which comprises a dispensing valve main body, a firing pin and a piston assembly, wherein a glue cavity and a piston cavity which are mutually isolated are arranged on the inner side of the dispensing valve main body, and the piston cavity is communicated with the outside; the firing pin penetrates through the glue cavity and the piston cavity and is in sliding fit with the dispensing valve main body; the piston assembly is sleeved on the outer side of the top of the firing pin and is in sliding fit with the dispensing valve main body in the piston cavity, and compressed air is input into the two cavity parts of the piston cavity to drive the piston assembly to drive the firing pin to open or close the connection between the glue cavity and the outside. The application also relates to a dispensing device and a dispensing method. The application provides a technical scheme glues the separation of chamber and piston chamber, glues the pressure of intracavity and keeps invariable, and the firing pin is glued the switching of control valve mouth in the chamber, and this scheme can be accurate carry out some glue, prevents to glue the in-process and goes out the condition emergence that the volume is unstable and leak and glue.

Description

Miniature precise dispensing valve, dispensing device and dispensing method

Technical Field

The application relates to the field of precise dispensing, in particular to a miniature precise dispensing valve, a dispensing device and a dispensing method.

Background

The glue dispensing is a process step which needs to be applied in the production and processing fields of electronics, automobile manufacturing, mobile communication, photovoltaic semiconductors, biopharmaceuticals and the like. The dispensing valve is used for the dispensing device and controls the spraying and stopping of the adhesive. To the control of the injection of viscose agent, current dispensing valve utilizes cylinder or diaphragm to press and penetrates, in the middle of the process of pressing and penetrates, the control glues the pressure in the intracavity and reaches a stable value, later controls the dispensing volume through the time of controlling to press and penetrates, after the dispensing is accomplished, through forming the negative pressure in gluing the intracavity, prevents that the viscose agent from flowing, however, in the middle of the process of adjusting intracavity pressure, because glue intracavity pressure is unstable, leads to the row to glue the volume unstability easily.

Disclosure of Invention

The technical problem that this application embodiment will solve provides a dispensing valve, can the outflow of accurate control viscose agent carry out some glue work.

In order to solve the technical problem, an embodiment of the present application provides a miniature precision dispensing valve, which adopts the following technical scheme:

a micro precise dispensing valve comprises a dispensing valve main body, a firing pin and a piston assembly, wherein a glue cavity and a piston cavity which are mutually isolated are arranged on the inner side of the dispensing valve main body, and the piston cavity is communicated with the outside; the firing pin penetrates through the glue cavity and the piston cavity and is in sliding fit with the dispensing valve main body; the piston assembly is sleeved on the outer side of the top of the firing pin and is in sliding fit with the dispensing valve main body in the piston cavity, and compressed air is input into the two cavity parts of the piston cavity to drive the piston assembly to drive the firing pin to open or close the connection between the glue cavity and the outside.

Furthermore, the piston assembly comprises two groups of leather cups, the bottoms of the two groups of leather cups are mutually abutted, the opening parts of the two groups of leather cups are respectively opposite to the two ends of the piston cavity, and the two groups of leather cups are fixed with the firing pin.

Further, the leather cup further comprises a screw, wherein the screw is in threaded connection with the firing pin and is matched with the firing pin to clamp the two leather cups.

Further, the piston assembly comprises two groups of gaskets, the two groups of gaskets are respectively arranged on the inner side of the leather cup, one group of gaskets is abutted to the screw, and the other group of gaskets is abutted to the firing pin.

Furthermore, the piston assembly further comprises a return spring, two ends of the return spring are respectively connected with the dispensing valve main body and the gasket, and the return spring drives the leather cup to drive the striker to reset in a state that compressed air is not input into the piston cavity.

Furthermore, the rubber sealing device further comprises a guide sleeve, wherein the guide sleeve is arranged on the inner side of the rubber cavity, and the guide sleeve is sleeved on the outer side of the firing pin and is in sliding fit with the firing pin.

The piston is characterized by further comprising at least one group of sealing rings, wherein the sealing rings are arranged between the piston cavity and the rubber cavity so as to ensure the liquid sealing between the piston cavity and the rubber cavity; the sealing ring comprises a jacket and a V-shaped spring, the V-shaped spring is arranged in a concave position on the jacket, the inner side of the jacket is opposite to the firing pin, and the outer side of the jacket is opposite to the inner wall of the dispensing valve main body.

The glue dispensing valve further comprises a valve nozzle and an end cover, wherein the valve nozzle is arranged at the front end of the glue cavity and is assembled and connected with the glue dispensing valve main body; the end cover is arranged at the rear end of the piston cavity and is assembled and connected with the dispensing valve main body.

In order to solve the above technical problem, an embodiment of the present application further provides a dispensing device, including the miniature precision dispensing valve of any one of claims 1 to 8, an adhesive supply member and a control device, wherein the adhesive supply member is connected to the adhesive chamber, and the control device is in driving connection with the piston assembly.

In order to solve the above technical problem, an embodiment of the present application further provides a dispensing method, which adopts the following technical scheme:

the method comprises the following steps:

compressed air is input into the first cavity part of the piston cavity, the piston assembly is driven to drive the firing pin to move upwards to open the connection between the glue cavity and the outside, and therefore glue dispensing is conducted. The piston assembly is driven to drive the striker to move downwards to close the connection between the glue cavity and the outside so as to stop dispensing by pumping out the compressed air of the first cavity part and inputting the compressed air to the second cavity part of the piston cavity. After the dispensing operation is finished, the return spring is matched with the piston assembly to reset.

Compared with the prior art, the embodiment of the application mainly has the following beneficial effects: during the injection process, the rubber cavity and the piston cavity are separated, and the striker controls the opening and closing of the valve nozzle in the rubber cavity, so that the pressure in the rubber cavity is kept constant. Compressed air is input into two cavity parts of the piston cavity to drive the piston assembly to drive the firing pin to open or close the glue cavity. The glue outlet and the glue outlet stop are instantaneously controlled by compressed air input into the two cavity parts. This scheme can be accurate carry out some glue, prevents to glue the in-process and goes out the condition of gluing volume unstability and hourglass glue.

Drawings

In order to illustrate the solution of the present application more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.

Fig. 1 is a schematic structural view of a micro precision dispensing valve according to the present invention.

Fig. 2 is an enlarged view of a portion a of fig. 1.

Fig. 3 is a flowchart of a dispensing method according to the present invention.

Reference numerals:

1-glue dispensing valve main body, 11-glue cavity, 12-piston cavity, 2-firing pin, 3-piston component, 31-leather cup, 32-gasket, 33-reset spring, 4-screw, 5-guide sleeve, 6-sealing ring, 7-valve mouth, 8-end cover.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

Embodiment I of miniature precise dispensing valve

Referring to fig. 1 and 2, the present application provides a micro precision dispensing valve, which includes a dispensing valve main body 1, a firing pin 2, and a piston assembly 3. The inner side of the dispensing valve main body 1 is provided with a glue cavity 11 and a piston cavity 12, the firing pin 2 penetrates through the glue cavity 11 and the piston cavity 12, and the piston assembly 3 is sleeved on the outer side of the top of the firing pin 2 and is in sliding fit with the dispensing valve main body 1 in the piston cavity 12. The piston chamber 12 is divided into two chambers isolated from each other by the piston assembly 3, and openings are provided on the side walls of the dispensing valve main body 1 to correspond to the two chambers, respectively, and the piston assembly 3 is driven to move by inputting compressed air into the two chambers. The glue cavity 11 is connected with the outside through a runner, and the glue cavity 11 receives the adhesive through the runner to serve as a material source for glue dispensing. The piston assembly 3 drives the firing pin 2 to move up and down and move accurately under the driving of input compressed air, and the piston cavity 12 is not communicated with the rubber cavity 11, so that the pressure in the rubber cavity 11 is irrelevant to the pressure provided by the compressed air in the piston cavity 12, the pressure is kept constant in the injection process, and the firing pin 2 can be accurately driven by controlling the piston assembly 3. Therefore, the problems of glue leakage or unstable glue discharge in the glue dispensing process can be solved.

The piston provides flow and pressure through oil, gas and other media by means of the piston cylinder principle, and moves in two directions in the piston cavity 12. Specifically, compressed air is input into a first cavity part at the lower part of a piston cavity, a piston assembly is driven to drive a firing pin to move upwards to open a valve nozzle, so that a glue cavity is communicated with the outside, and the adhesive is sprayed out from the valve nozzle under the pressure provided by the outside; compressed air is input into the cavity part at the upper part of the piston cavity, the piston assembly is driven to drive the firing pin to seal the valve nozzle, the valve nozzle is closed to be connected with the outside, and glue discharging is stopped.

Further, the piston assembly 3 includes a cup 31. The leather cups 31 are provided with two groups along the motion direction of the piston, the bottoms of the two groups of leather cups 31 are mutually attached and are fixedly sleeved on the firing pin 2, the openings of the leather cups 31 are opposite to the two ends of the piston cavity 12 respectively, and the two groups of leather cups 31 receive compressed air provided by the two cavity parts of the piston cavity 12 through the openings respectively to drive the firing pin 2 to move. By squeezing the cup 31 with fluid, the edge of the cup 31 is flared outward and tightly fitted with the inner wall of the dispensing valve body 1 within an allowable pressure range. Compressed air pressure is big more, and leather cup 31 is inseparabler with the inner wall contact of dispensing valve main part 1, can effectively prevent revealing of fluid to compare with traditional O type piston, leather cup 31 is in the middle of the process of motion, is showing with the inner wall frictional force of dispensing valve main part 1 and reduces, can be through setting up littleer dispensing valve main part 1, the motion of faster drive firing pin 2, thereby improve response speed, and then improve the precision of gluing.

Specifically, the leather cups 31 are usually correspondingly provided with a plurality of groups, and the openings are oppositely arranged in the upper direction and the lower direction respectively, so as to receive driving forces provided by flow and pressure in the two directions respectively and drive the striker to move in the two directions.

Further, miniature accurate dispensing valve still includes screw 4,

screw

4 and 2 threaded connection of firing pin and cooperation firing pin 2 press from both sides two sets of leather cups 31, the hole that can holding screw 4 is seted up at the root of firing pin 2, and be provided with screw 4 in the hole,

screw

4 and 2 threaded connection of firing pin in the hole, two sets of leather cups 31 cup joint in the concave position at firing pin 2 top, through rotating screw 4, the position of adjustment screw 4, make screw 4 and leather cup 31 butt, and cooperate firing pin 2 to press from both sides tight leather cup 31 in the concave position, in the middle of the process that leather cup 31 drove firing pin 2 and remove, can guarantee the firm of being connected between leather cup 31 and the firing pin 2.

Further, the piston assembly 3 further comprises two groups of gaskets 32, the gaskets 32 correspond to the leather cup 31 and are arranged on the inner side of the leather cup 31, the two groups of gaskets 32 are respectively abutted to the screw 4 and the firing pin 2, and the screw 4 and the firing pin 2 fix the two groups of leather cups 31 by clamping the two groups of gaskets 32. Because the edge of leather cup 31 outwards sticks up, leather cup 31's overall shape is irregular to the middle part is thinner, has influenced piston assembly 3's structural strength, and under the state that screw 4 and firing pin 2 cooperate the tight leather cup 31 of clamp, the centre gripping effect remains to be promoted, strengthens two sets of leather cups 31's structural strength through setting up gasket 32, and promotes screw 4 and firing pin 2 to the centre gripping effect of leather cup 31, effectively strengthens the fixed effect between leather cup 31 and the firing pin 2.

Further, the piston assembly 3 comprises a return spring 33, one end of the return spring 33 is fixed to the dispensing valve body 1, the other end of the return spring 33 is fixed to the gasket 32, the gasket 32 is pushed to drive the cup 31 to drive the striker 2 to move, in the injection process, the cup 31 is driven to drive the striker 2 to open and close the connection between the glue cavity and the outside, then compressed air in the piston cavity 12 is removed, the cup 31 drives the striker 2 to reset under the driving of the return spring 33, the initial position of the striker 2 is adjusted in this way, and the striker is prevented from being separated from the valve nozzle in the non-working state to cause leakage of the adhesive.

Further, miniature accurate dispensing valve still includes uide bushing 5, and uide bushing 5 sets up the inboard in gluey chamber 11 to the cover is established in the outside of firing pin 2, with firing pin 2 sliding fit, the position that uide bushing 5 set up is in the middle part of firing pin 2, can restrict firing pin 2 radial ascending displacement and shake, in the middle of firing pin 2 activity, can keep its directive property, make firing pin 2 aim at the nozzle all the time, guarantee the point and glue the in-process, glue the leakproofness in chamber. The runner for delivering the glue to the glue cavity 11 penetrates through the guide sleeve 5, so that the glue can be delivered into the glue cavity 11 through the runner on the premise that the guide sleeve 5 plays a role in guiding the firing pin 2.

Further, the miniature precision dispensing valve further comprises at least one group of sealing rings 6, each sealing ring 6 comprises a jacket and a V-shaped spring, each V-shaped spring is arranged in a concave position on each jacket, the inner side of each jacket is opposite to the corresponding striker 2, the outer side of each jacket is opposite to the inner wall of the dispensing valve main body 1, the inner side of each jacket is abutted to the corresponding striker 2 in the state that the corresponding striker 2 penetrates through the inner ring, the outer side of each jacket is abutted to the inner wall of the corresponding dispensing valve main body 1, the inner side of each jacket is tightly matched with the corresponding striker 2 under the driving of the corresponding V-shaped spring, and the outer side of each jacket is tightly matched with the inner wall of the corresponding dispensing valve main body 1, so that the liquid seal between the piston cavity 12 and the glue cavity 11 is ensured, the situation that the glue and fluid in.

Further, miniature accurate dispensing valve still includes valve mouth 7 and end cover 8, and wherein valve mouth 7 sets up at gluey 11 front ends in chamber to with dispensing valve main part 1 be assembled between/be connected, connected mode includes but not limited to screw thread, joint, interference fit etc. can guarantee the connected mode of liquid sealing between valve mouth 7 and the dispensing valve main part 1. In the present embodiment, a valve nozzle seat is provided, and the valve nozzle 7 is disposed on the valve nozzle seat and is assembled and connected with the dispensing valve main body 1 through the valve nozzle seat. The end cover 8 is arranged at the rear end of the piston cavity 12 and is assembled and connected with the dispensing valve main body 1. The advantage of this scheme lies in, through setting up valve mouth 7 and end cover 8 and the separation of dispensing valve main part 1, can guarantee that the dispensing valve is quick detachable and the assembly, is favorable to the routine maintenance of dispensing valve.

Miniature accurate dispensing valve, push the firing pin through setting up the piston cylinder, and replace traditional O type circle piston through setting up the leather cup, piston assembly is less with the frictional force of piston cylinder inner wall, the volume of the piston chamber that sets up for satisfying the required drive power of firing pin is littleer for traditional piston cylinder and other drive firing pin drive structure sizes that move from top to bottom, drive the piston simultaneously in less piston chamber, it still less to reach the air that preset pressure required compression, the filling time is fast, easy accurate control, the reaction is also faster, can effectively guarantee the precision of point gluing.

Embodiments of a dispensing device

The application relates to a glue dispensing device, which comprises the miniature precise glue dispensing valve and a glue supplying piece, wherein the glue supplying piece is in liquid connection with a glue cavity 11 on the glue dispensing valve and is used for supplying glue to the glue dispensing valve; the automatic dispensing device further comprises a control device, the piston assembly 3 is driven by inputting or exporting gas and liquid to or from the two cavity parts in the piston cavity 12 to drive the striker 2 to move, the movement of the striker 2 is controlled through the control of the piston to accurately control the opening or closing of the dispensing valve, so that accurate dispensing is realized, and accurate dispensing of workpieces can be realized in a small space.

The adhesive supplying part is a glue barrel with a feed valve and a discharge valve, the feed valve and the discharge valve are respectively connected with the glue cavity through pipelines, the feed valve transmits adhesive to the glue cavity through the glue barrel, and the discharge valve discharges the adhesive in the glue cavity into the glue barrel. Alternatively, the control device may be an air pump, an oil pump, or the like, and continuously supplies compressed air or hydraulic oil to any chamber portion of the piston chamber. The control piston drives the firing pin to operate.

Embodiments of a dispensing method of the present application

The dispensing method comprises the following steps:

step S10: compressed air is input into the first cavity part of the piston cavity, the piston assembly is driven to drive the firing pin to move upwards to open the connection between the glue cavity and the outside, and therefore glue dispensing is conducted.

The micro precise dispensing valve drives the piston to move and stop in the piston cavity 12 with a small space, the precision of the control of the starting and stopping actions of the piston is high, and the movement of the firing pin 2 can be precisely controlled through the piston to stably and precisely output a proper amount of adhesive. The starting and the ending of dispensing are controlled by controlling the pressure of compressed air in the piston cavity and accurately controlling the lifting and the pressing of the firing pin, and the dispensing valve is accurately controlled to output a proper amount of adhesive.

Step S20: the piston assembly is driven to drive the striker to move downwards to close the connection between the glue cavity and the outside so as to stop dispensing by pumping out the compressed air of the first cavity part and inputting the compressed air to the second cavity part of the piston cavity.

Step S30: after the dispensing operation is finished, the return spring is matched with the piston assembly to reset.

After dispensing is completed, the fluid flow and pressure in the piston chamber 12 are removed, the piston assembly 3 is returned to the initial position by the return spring 33, ready for the next stage of injection operation, and leakage of the paste is prevented in the non-operating state.

According to the scheme, accurate dispensing is realized by precisely controlling the movement of the piston to drive the movement of the firing pin 2 in the piston cavity 12 with a small specification, and the initial position of the firing pin 2 is kept constant between two times of dispensing, so that the consistency of dispensing operation is enhanced.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that the present application may be practiced without modification or with equivalents of some of the features described in the foregoing embodiments. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims

1. The utility model provides a miniature accurate dispensing valve which characterized in that: the glue dispensing valve comprises a glue dispensing valve main body, a firing pin and a piston assembly, wherein a glue cavity and a piston cavity which are mutually isolated are arranged on the inner side of the glue dispensing valve main body, and the piston cavity is communicated with the outside; the firing pin penetrates through the glue cavity and the piston cavity and is in sliding fit with the dispensing valve main body; the piston assembly is sleeved on the outer side of the top of the firing pin and is in sliding fit with the dispensing valve main body in the piston cavity, and compressed air is input into the two cavity parts of the piston cavity to drive the piston assembly to drive the firing pin to open or close the connection between the glue cavity and the outside.

2. The miniature precision dispensing valve of claim 1, wherein: the piston assembly comprises at least two groups of leather cups, the bottoms of the leather cups are mutually abutted, the opening parts of the leather cups are opposite to the two ends of the piston cavity respectively, and the leather cups are fixed with the firing pin.

3. The miniature precision dispensing valve of claim 2, wherein: the leather cup is characterized by further comprising a screw, wherein the screw is in threaded connection with the firing pin and is matched with the firing pin to clamp the two leather cups.

4. The miniature precision dispensing valve of claim 3, wherein: the piston assembly comprises two groups of gaskets, the two groups of gaskets are respectively arranged on the inner side of the leather cup, one group of gaskets is abutted to the screw, and the other group of gaskets is abutted to the firing pin.

5. The miniature precision dispensing valve of claim 4, wherein: the piston assembly further comprises a return spring, two ends of the return spring are respectively connected with the dispensing valve main body and the gasket, and the return spring drives the leather cup to drive the striker to reset in a state that compressed air is not input into the piston cavity.

6. The miniature precision dispensing valve according to any one of claims 1 to 5, wherein: the rubber sealing device is characterized by further comprising a guide sleeve, wherein the guide sleeve is arranged on the inner side of the rubber cavity, and the guide sleeve is sleeved on the outer side of the firing pin and is in sliding fit with the firing pin.

7. The miniature precision dispensing valve of claim 6, wherein: the piston is characterized by further comprising at least one group of sealing rings, wherein the sealing rings are arranged between the piston cavity and the rubber cavity so as to ensure the liquid sealing between the piston cavity and the rubber cavity; the sealing ring comprises a jacket and a V-shaped spring, the V-shaped spring is arranged in a concave position on the jacket, the inner side of the jacket is opposite to the firing pin, and the outer side of the jacket is opposite to the inner wall of the dispensing valve main body.

8. The miniature precision dispensing valve of claim 7, wherein: the glue dispensing valve further comprises a valve nozzle and an end cover, wherein the valve nozzle is arranged at the front end of the glue cavity and is assembled and connected with the glue dispensing valve main body; the end cover is arranged at the rear end of the piston cavity and is assembled and connected with the dispensing valve main body.

9. A kind of glue dropping apparatus, its characterized in that: the micro precision dispensing valve comprises a micro precision dispensing valve as claimed in any one of claims 1 to 8, an adhesive supply member and a control device, wherein the adhesive supply member is connected with the adhesive cavity, and the control device is in driving connection with the piston assembly.

10. A dispensing method using the micro precision dispensing valve of any one of claims 1 to 8 for dispensing, characterized in that: the method comprises the following steps:

compressed air is input into the first cavity part of the piston cavity, and the piston assembly is driven to drive the firing pin to move upwards to open the connection between the glue cavity and the outside so as to carry out glue dispensing;

the piston assembly is driven to drive the firing pin to move downwards to close the connection between the glue cavity and the outside so as to stop dispensing by pumping out the compressed air of the first cavity part and inputting the compressed air to the second cavity part of the piston cavity;

after the dispensing operation is finished, the return spring is matched with the piston assembly to reset.