CN218799697U

CN218799697U - Lead-free solder paste spraying structure easy to spray

Info

Publication number: CN218799697U
Application number: CN202221886402.2U
Authority: CN
Inventors: 黄云波
Original assignee: Dongguan Comprehensive Research Electronics Co ltd
Current assignee: Dongguan Comprehensive Research Electronics Co ltd
Priority date: 2022-07-20
Filing date: 2022-07-20
Publication date: 2023-04-07
Anticipated expiration: 2032-07-20

Abstract

The utility model relates to an easily-jetted leadless solder paste injection structure, including the cylinder, injection valve and solenoid valve, cylinder and solenoid valve set up on the injection valve, the cylinder is including cylinder body and piston, the piston activity sets up in the cylinder body, the injection valve is including the main valve body, firing pin and elastic construction, be provided with the nozzle on the main valve body, the tip and the nozzle butt of firing pin, elastic construction sets up between firing pin and the main valve body, the cylinder body lets in positive atmospheric pressure, promote the piston and extrude the solder paste, the solenoid valve leads to positive atmospheric pressure in to the injection valve, positive atmospheric pressure promotes the firing pin and removes to elastic construction, open the nozzle, the solder paste outwards sprays through the nozzle under the drive of positive atmospheric pressure. Above-mentioned leadless solder paste injection structure who easily sprays passes through the cylinder through positive atmospheric pressure, can stably provide the solder paste to the injection valve, and the solenoid valve provides positive atmospheric pressure to the injection valve, drives the firing pin and removes, can make the firing pin up-and-down motion in-process realize becoming thin to the shearing of solder paste, prevents that the tin pearl from taking place the cold welding because of the contact extrusion.

Description

Easily-sprayed lead-free solder paste spraying structure

Technical Field

The utility model belongs to the technical field of the solder paste technique and specifically relates to a leadless solder paste that easily sprays structure is related to.

Background

Solder paste is a novel welding material which is generated along with SMT (surface mount technology), in recent years, in order to reduce the pollution of lead to the environment and the influence of human health, various lead-free solders are developed in various countries around the world in succession, the lead-free solder paste which is the mainstream at present is the tin-silver-copper lead-free solder paste, and the existing solder paste coating process is generally divided into two modes, namely screen printing which is suitable for mass production and the solder paste jet printing technology. The tin paste spray printing technology is that tin paste can be sprayed at an extremely high speed through a unique sprayer, and space limitation and selective coating of special-shaped components are realized. The solder paste cannot be sprayed by conventional contact spray because the contact impact causes high pressure squeeze to the solder paste in the dead space below the firing pin and nozzle, thereby causing cold solder. The existing tin paste spraying method is to generate tin paste glue dots by screw stirring and non-contact impact of a piezoelectric firing pin, but the method has limited spraying capability, short service life, troublesome maintenance and high cost.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an easily-jetted lead-free solder paste jetting structure, which solves the above technical problems, and has the advantages of convenient maintenance, long service life and low manufacturing cost.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an easy unleaded tin cream injection structure who sprays, including cylinder, injection valve and solenoid valve, the cylinder with the solenoid valve sets up in on the injection valve, the cylinder is including cylinder body and piston, the piston activity set up in the cylinder body, the injection valve is including the main valve body, firing pin and elastic construction, be provided with the nozzle on the main valve body, the tip of firing pin with the nozzle butt, elastic construction set up in between the firing pin with the main valve body, the cylinder body lets in positive atmospheric pressure, promotes the piston extrudes tin cream, the solenoid valve to lead to positive atmospheric pressure in the injection valve, positive atmospheric pressure promotes the firing pin to elastic construction removes, opens the nozzle, the tin cream passes through under the drive of positive atmospheric pressure the nozzle outwards sprays.

In a preferred embodiment, the striker includes a movable portion and a thimble portion, the thimble portion is provided at a lower end of the movable portion, and the movable portion moves in the main valve body.

As a preferable technical solution, a seal ring is provided between the main valve body and the movable portion.

As a preferred technical scheme, the elastic structure comprises a connecting portion, a spring and a guide portion, one end of the connecting portion is connected with the upper end of the movable portion, the other end of the connecting portion is connected with the guide portion, the guide portion is movably arranged on the outer surface of the main valve body, one end of the spring is abutted against the connecting portion, and the other end of the spring is abutted against the main valve body.

As a preferred technical scheme, an air inlet, a feed inlet and a movable cavity are arranged in the main valve body, the air inlet and the feed inlet are respectively communicated with the movable cavity, the air inlet is connected with the electromagnetic valve, and the feed inlet is connected with the needle cylinder.

As a preferable technical solution, it is further provided with a connecting seat, and the needle cylinder is connected with the injection valve through the connecting seat.

As a preferred technical scheme, be provided with on the syringe body and extrude mouth and hose, it sets up to extrude the mouth in the lower extreme of syringe body, the hose set up in the upper end of syringe body, and be connected with a proportional valve.

The beneficial effects of the utility model reside in that: above-mentioned leadless solder paste injection structure who easily sprays passes through the cylinder through positive atmospheric pressure, can steadily provide solder paste to the injection valve, and the solenoid valve provides positive atmospheric pressure to the injection valve, drives the firing pin and removes, can make the shearing of firing pin up-and-down motion in-process realization to solder paste thin, can prevent from this that the tin pearl from taking place the cold welding because of the contact extrusion, can also effectively improve the spraying performance to longe-lived, it is convenient to maintain, and use cost is low.

Drawings

Fig. 1 is a schematic structural diagram of an easy-to-spray lead-free solder paste spraying structure according to the present invention;

fig. 2 is a schematic structural diagram of an injection valve according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, an easy-to-spray lead-free solder paste spraying structure comprises a needle cylinder 2, a spray valve 1, an electromagnetic valve 3 and a connecting seat 4, wherein the needle cylinder 2 is communicated with the spray valve 1 through the connecting seat 4, the needle cylinder 2 supplies solder paste to the spray valve 1, the electromagnetic valve 3 is communicated with the spray valve 1, and the electromagnetic valve 3 supplies positive air pressure to the spray valve 1, so that the solder paste is sprayed out from the spray valve 1 under the driving of the positive air pressure.

Referring to fig. 1 and fig. 2, an injection valve 1 includes a main valve body 11, a striker 12, and an elastic structure 13, the main valve body 11 is provided with a nozzle 111, an air inlet 113, a feed inlet 114, and a movable cavity 112, the nozzle 111, the air inlet 113, the feed inlet 114, and the movable cavity 112 are respectively communicated with the nozzle 111, the nozzle 111 is disposed at the lower end of the main valve body 11, the air inlet 113 and the feed inlet 114 are disposed on the side wall of the main valve body 11, the air inlet 113 is connected with the electric torch of the solenoid valve 3, the feed inlet 114 is communicated with the syringe 2, the striker 12 and the elastic structure 13 are disposed in the movable cavity 112, the end of the striker 12 abuts against the nozzle 111, the elastic structure 13 is disposed between the striker 12 and the main valve body 11, the elastic structure 13 keeps the end of the striker 12 abutting against the nozzle 111, so that the nozzle 111 can be kept closed, and avoid the solder paste from flowing out, the striker 12 includes a movable portion 121, an ejector pin portion 122 and a seal ring 123, the ejector pin portion 122 is disposed at a lower end of the movable portion 121, the movable portion 121 moves in the movable cavity 112, the seal ring 123 is disposed between the movable cavity 112 and the movable portion 121, and prevents air pressure introduced by the solenoid valve 3 from flowing out from a gap between the movable portion 121 and the movable cavity 112, so as to ensure constant pressure during spraying, the elastic structure 13 includes a connecting portion 131, a spring 132 and a guide portion 133, one end of the connecting portion 131 is connected to an upper end of the movable portion 121, the other end is connected to the guide portion 133, the guide portion 133 is movably disposed on an outer surface of the main valve body 11, one end of the spring 132 abuts against the connecting portion 131, and the other end abuts against the main valve body 11, and the elastic structure 13 can continuously provide an elastic action to the striker 12, so that the striker 12 abuts against the nozzle 111, and the nozzle 111 is kept closed.

Referring to fig. 1, the syringe 2 includes a syringe body 21 and a piston 22, the piston 22 is movably disposed in the syringe body 21, the syringe body 21 is provided with an extrusion port 23 and a hose 24, the extrusion port 23 is disposed at a lower end of the syringe body 21, the hose 24 is disposed at an upper end of the syringe body 21, the hose 24 is supplied with positive air pressure to push the piston 22 to move from one end close to the hose 24 to the extrusion port 23, and the hose 24 is connected to a proportional valve, which can control the air pressure supplied to the hose 24 to control the feeding speed of the solder paste.

When the lead-free solder paste injection structure easy to inject is used, positive air pressure is introduced into the hose 24 through the proportional valve, the piston 22 is pushed to move from one end close to the hose 24 to the extrusion port 23, solder paste is extruded from the extrusion port 23 and flows into the feed port 114 of the injection valve 1 through the connecting seat 4, the electromagnetic valve 3 conducts air to the air inlet 113, so that air is filled between the movable part 121 and the Odong cavity 112, the air pressure is gradually increased due to the fact that the nozzle 111 is in a closed state, the movable part 121 is further pushed to move upwards, the spring 132 is compressed, the thimble part 122 is further driven to leave the nozzle 111, the nozzle 111 is opened, meanwhile, the air introduced into the electromagnetic valve 3 drives the solder paste to inject outwards under the action of the air pressure, and solder paste injection is further achieved.

The above-mentioned embodiments are merely preferred examples of the present invention, and do not limit the scope of the present invention, so all equivalent changes or modifications made by the structure, features and principles of the present invention should be included in the claims of the present invention.

Claims

1. The utility model provides an easily-jetted leadless tin cream injection structure, its characterized in that, including cylinder, injection valve and solenoid valve, the cylinder with the solenoid valve sets up on the injection valve, the cylinder is including cylinder body and piston, the piston activity sets up in the cylinder body, the injection valve is including main valve body, firing pin and elastic construction, be provided with the nozzle on the main valve body, the tip of firing pin with the nozzle butt, elastic construction sets up in between the firing pin with the main valve body, the cylinder body lets in positive air pressure, promotes the piston extrudes tin cream, the solenoid valve to leading in positive air pressure in the injection valve, positive air pressure promotes the firing pin to elastic construction removes, opens the nozzle, the tin cream passes through the nozzle outwards injection under the drive of positive air pressure.

2. The easy-to-spray pb-free solder paste spray structure of claim 1, wherein the plunger includes a movable portion and a needle portion, the needle portion is disposed at a lower end of the movable portion, and the movable portion moves in the main valve body.

3. The easy-to-spray pb-free solder paste spray structure according to claim 2, wherein a seal ring is provided between the main valve body and the movable portion.

4. The easy-to-spray pb-free solder paste spray structure according to claim 2 or 3, wherein the elastic structure comprises a connection portion, a spring, and a guide portion, one end of the connection portion is connected to an upper end of the movable portion, the other end is connected to the guide portion, the guide portion is movably disposed on an outer surface of the main valve body, one end of the spring abuts against the connection portion, and the other end abuts against the main valve body.

5. The easy-to-spray pb-free solder paste spray structure of claim 4, wherein an air inlet, a feed inlet and a movable cavity are provided in the main valve body, the air inlet and the feed inlet are respectively communicated with the movable cavity, the air inlet is connected with the electromagnetic valve, and the feed inlet is connected with the needle cylinder.

6. The easy-to-spray pb-free solder paste spray structure of claim 5, further provided with a connection seat through which the cylinder is connected with the spray valve.

7. The easy-to-spray pb-free solder paste spray structure of claim 6, wherein the syringe body is provided with an extrusion port and a hose, the extrusion port is provided at a lower end of the syringe body, and the hose is provided at an upper end of the syringe body and is connected to a proportional valve.