CN107552319B

CN107552319B - Split type pneumatic dispensing valve

Info

Publication number: CN107552319B
Application number: CN201710895275.XA
Authority: CN
Inventors: 陈云辉
Original assignee: Shenzhen Pengchuangda Automation Co ltd
Current assignee: Shenzhen Pengchuangda Automation Co ltd
Priority date: 2017-09-27
Filing date: 2017-09-27
Publication date: 2023-01-17
Anticipated expiration: 2037-09-27
Also published as: CN107552319A

Abstract

The invention discloses a split type pneumatic dispensing valve, which comprises an air cylinder, wherein the air cylinder comprises a cylinder barrel and a first-stage valve firing pin partially accommodated in the cylinder barrel, and the first-stage valve firing pin is connected with the cylinder barrel in a sliding manner; the injection mechanism comprises a secondary injection firing pin, a nozzle, an injection seat and a first elastic piece, the injection seat is provided with an injection cavity with two through ends, the nozzle is covered at an opening at one end of the injection cavity, the part of the secondary injection firing pin is inserted into the injection cavity from the opening at one end of the injection cavity, one end of the first elastic piece is connected with the injection seat, the other end of the first elastic piece is connected with the secondary injection firing pin, and the first elastic piece drives the secondary injection firing pin to be far away from the nozzle; the feeding mechanism provides colloid to the spraying cavity; the first-stage valve firing pin slides relative to the cylinder barrel and impacts the second-stage injection firing pin, the second-stage injection firing pin is driven by the first-stage valve firing pin to be close to the nozzle, and the colloid in the injection cavity is extruded out of the nozzle. The technical scheme of the invention improves the spraying consistency and reliability of the split type pneumatic dispensing valve.

Description

Split type pneumatic dispensing valve

Technical Field

The invention relates to the technical field of dispensing mechanism equipment, in particular to a split type pneumatic dispensing valve.

Background

The dispensing technology is widely applied to the electronic manufacturing industry. The non-contact spraying dispensing has the advantages of high spraying frequency, small dispensing diameter, uniform dispensing point, good consistency and the like, so that the non-contact spraying dispensing is greatly developed in the industry. In the prior art, the pneumatic dispensing valve has low spraying cost, but the consistency of sprayed glue dots is poor, small liquid drops are difficult to obtain and difficult to improve, and the reliability is not high; the piezoelectric jet has a limited application place because of the brittleness of the piezoelectric material and the short service life of the material, such as ceramic and magnetic elements, which greatly increases the application cost.

Disclosure of Invention

The invention mainly aims to provide a split type pneumatic dispensing valve, which aims to ensure that the impact process of the split type pneumatic dispensing valve is stable and reliable through a first-stage valve firing pin and a second-stage jet firing pin, and the consistency of glue dots sprayed out by the split type pneumatic dispensing valve is ensured.

In order to achieve the purpose, the split type pneumatic dispensing valve provided by the invention comprises: the cylinder comprises a cylinder barrel and a primary valve firing pin partially accommodated in the cylinder barrel, and the primary valve firing pin is connected with the cylinder barrel in a sliding manner; the injection mechanism comprises a secondary injection firing pin, a nozzle, an injection seat and a first elastic piece, wherein the injection seat is provided with an injection cavity with two through ends, the nozzle covers one end opening of the injection cavity, the secondary injection firing pin is partially inserted into the injection cavity from one end opening of the injection cavity, one end of the first elastic piece is connected with the injection seat, the other end of the first elastic piece is connected with the secondary injection firing pin, and the first elastic piece drives the secondary injection firing pin to be far away from the nozzle; the feeding mechanism provides colloid to the spraying cavity; the primary valve firing pin slides relative to the cylinder barrel and impacts the secondary injection firing pin, and the secondary injection firing pin is driven by the primary valve firing pin to be close to the nozzle so as to extrude the colloid in the injection cavity out of the nozzle.

Optionally, the injection mechanism further includes a gland, the gland is fixedly connected to the injection seat and seals one end of the injection cavity away from the nozzle, the secondary injection striker penetrates through the gland and extends into the injection cavity, an striker cap is disposed at one end of the secondary injection striker close to the primary valve striker, the first elastic member is sleeved on the secondary injection striker, one end of the first elastic member abuts against the striker cap, and the other end of the first elastic member abuts against the gland.

Optionally, the pressing cover is provided with a limiting groove, the bottom wall of the limiting groove is provided with a limiting hole, the secondary injection firing pin penetrates through the limiting hole, and the first elastic part is partially accommodated in the limiting groove.

Optionally, one end of the cylinder barrel, which is close to the gland, is further connected with a limiting block, the first-stage valve firing pin partially penetrates through the limiting block, and when the first elastic member drives the second-stage injection firing pin to be far away from the nozzle, the firing pin cap is stopped by the limiting block.

Optionally, the split pneumatic dispensing valve further includes a jet striker guide sleeve sleeved on the secondary jet striker, the jet striker guide sleeve is clamped between the gland and the jet seat, the jet striker guide sleeve includes a connection section, the connection section extends into the jet cavity, an outer wall of the connection section abuts against a cavity wall of the jet cavity, and an inner wall of the connection section abuts against the secondary jet striker.

Optionally, the guide sleeve for the jet striker further includes a limiting section connected to the connecting section, an outer diameter of the limiting section is larger than an outer diameter of the connecting section, an outer wall of the limiting section is annularly provided with a mounting groove, a sealing ring is accommodated in the mounting groove, and the sealing ring abuts against a cavity wall of the jet cavity.

Optionally, a second elastic element is further arranged in the cylinder barrel, the second elastic element is connected with the cylinder barrel, the other end of the second elastic element is connected with the first-stage valve striker, and when the cylinder is inflated, the first-stage valve striker slides relative to the cylinder barrel and elastically compresses the second elastic element; when the air cylinder is deflated, the second elastic piece drives the primary valve firing pin to approach and impact the secondary injection firing pin.

Optionally, the split pneumatic dispensing valve further includes a stroke adjusting mechanism connected to one end of the cylinder far away from the injection mechanism, the stroke adjusting mechanism includes a stroke upper nut and a stroke screw, one end of the stroke screw is screwed to the stroke upper nut, the other end of the stroke screw is movably connected to the cylinder and extends into the cylinder, the second elastic member is located between the stroke screw and the first-stage valve striker, a stop portion is disposed at one end of the stroke screw close to the first-stage valve striker, and when the second elastic member is compressed to a maximum stroke, the first-stage valve striker abuts against the stop portion.

Optionally, the stroke adjusting mechanism further includes a pre-tightening force screw, the pre-tightening force screw is screwed between the cylinder and the stroke screw, the sleeve passes through the pre-tightening force screw, and one end of the second elastic member, which is far away from the first-stage valve striker, abuts against the pre-tightening force screw.

Optionally, one end of the primary valve striker for striking the secondary spray striker is provided as a curved circular surface.

According to the technical scheme, the primary valve firing pin and the secondary injection firing pin are adopted, when the air cylinder is inflated, the primary valve firing pin leaves the secondary injection firing pin, the first elastic piece drives the secondary injection firing pin to be far away from the nozzle, and colloid is filled between the secondary injection firing pin and the nozzle; when the air cylinder deflates, the primary valve firing pin moves towards the primary valve firing pin and impacts the secondary injection firing pin, so that the secondary injection firing pin approaches and impacts the nozzle, further local high pressure is formed in the injection cavity, and the colloid is extruded out of the nozzle. The split type pneumatic dispensing valve has a secondary collision function, the length of the primary valve firing pin and the length of the secondary injection firing pin are shorter than that of the integrated firing pin, the coaxiality of the primary valve firing pin and the secondary injection firing pin during processing is greatly improved, the stability and the reliability of quick impact of the primary valve firing pin and the secondary injection firing pin are guaranteed, and the consistency of glue points sprayed by the spray nozzle is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural view of an embodiment of a split pneumatic dispensing valve of the present invention;

FIG. 2 is a schematic view of the pneumatic dispensing valve of FIG. 1 from another perspective;

FIG. 3 isbase:Sub>A cross-sectional view taken at A-A of FIG. 2;

fig. 4 is an enlarged view of fig. 3 at V.

The reference numbers indicate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all directional indicators (such as up, down, left, right, front, and back \8230;) in the embodiments of the present invention are only used to explain the relative positional relationship between the components, the motion situation, etc. in a specific posture (as shown in the attached drawings), and if the specific posture is changed, the directional indicators are changed accordingly.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, descriptions such as "first", "second", etc. in the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The present invention provides a split pneumatic dispensing valve 100.

In the embodiment of the present invention, please refer to fig. 1 and fig. 3 in combination, the split type pneumatic dispensing valve 100 includes a cylinder 1, the cylinder 1 includes a cylinder barrel 10 and a first-stage valve striker 11 partially accommodated in the cylinder barrel 10, and the first-stage valve striker 11 is slidably connected to the cylinder barrel 10; the injection mechanism 2, the injection mechanism 2 includes the second grade sprays the firing pin 21, spray nozzle 22, spray seat 20, and the first elastic component 23, spray seat 20 has both ends through-going injection chamber 201 to form, the one end opening in the injection chamber 201 of the cap of spray nozzle 22, the second grade sprays the firing pin 21 part and inserts the injection chamber 201 from one end opening of the injection chamber 201, one end of the first elastic component 23 connects and sprays the seat 20, another end connects the second grade and sprays the firing pin 21, the first elastic component 23 drives the second grade to spray the firing pin 21 and keep away from the spray nozzle 22; the feeding mechanism provides colloid into the injection cavity 201; the primary valve plunger 11 slides relative to the cylinder 10 and strikes the secondary spray plunger 21, and the secondary spray plunger 21 is driven by the primary valve plunger 11 to approach the nozzle 22, so that the colloid in the spray chamber 201 is extruded out of the nozzle 22.

The pneumatic dispensing valve is suitable for various industries and is very widely applied, such as SMD/SMT surface mount semiconductor manufacturing industry, electronic component industry, semiconductor packaging PCB electronic part fixing and LCD glass machine plate packaging and bonding protection, mobile phone board coating or key dispensing, loudspeaker dispensing, battery box dispensing and sealing, automobile and machinery part coating, hardware part coating and bonding, chip bonding and the like. The cylinder 1 is preferably a high-frequency electromagnetic valve pneumatic cylinder 1, and the pneumatic dispensing valve is correspondingly provided with a valve bracket 6 for supporting the high-frequency electromagnetic valve for air supply. When the cylinder 1 is inflated, high air pressure is rapidly generated in the cylinder barrel 10, and the air pressure pushes the first-stage valve striker 11 to move; when the air in the cylinder 1 is discharged, the air pressure in the cylinder barrel 10 is reduced, the primary valve firing pin 11 returns to the initial position, the air pressure is quickly reversed, and the primary valve firing pin 11 impacts the secondary injection firing pin 21 at high frequency; the primary valve striker 11 extends at one end beyond the cylinder 10 to strike the secondary jet striker 21. The primary valve striker 11 and the secondary spray striker 21 are preferably made of materials with high wear resistance and high hardness, such as tungsten steel and ceramic lamps, which improves the reliability and life of the split pneumatic dispensing valve 100. The secondary firing pin 21 moves up and down relative to the wall of the firing chamber 201. The first elastic member 23 is preferably a compression spring, which is a coil spring subjected to an axial pressing force. The compression spring has various shapes such as a cylinder shape, a conical shape, a convex shape and a concave shape, and a small amount of non-circular shapes or even various tail end variants, and in the invention, the compression spring is preferably cylindrical, so that the elastic force generated by the cylinder 10 and the injection mechanism 2 is uniform and stable, and further the secondary injection firing pin 21 moves stably.

According to the technical scheme, the primary valve firing pin 11 and the secondary injection firing pin 21 are adopted, when the air cylinder 1 is inflated, the primary valve firing pin 11 leaves the secondary injection firing pin 21, the first elastic piece 23 drives the secondary injection firing pin 21 to be far away from the nozzle 22, and colloid is filled between the secondary injection firing pin 21 and the nozzle 22; when the air cylinder 1 is deflated, the primary valve firing pin 11 moves towards the primary valve firing pin 11 and impacts the secondary injection firing pin 21, so that the secondary injection firing pin 21 approaches and impacts the nozzle 22, and further, a local high pressure is formed in the injection cavity 201, and the colloid is extruded from the nozzle 22. The split type pneumatic dispensing valve 100 is realized to have a secondary collision function, the length of the primary valve firing pin 11 and the length of the secondary injection firing pin 21 are shorter than the length of the integrated firing pin, so that the coaxiality of the primary valve firing pin 11 and the secondary injection firing pin 21 during processing is greatly improved, the stability and reliability of quick impact of the primary valve firing pin 11 and the secondary injection firing pin 21 are ensured, and the consistency of glue points sprayed by the nozzle 22 is ensured.

In the present invention, referring to fig. 1, the feeding mechanism includes a feeding guide member, the feeding guide member has a feeding threaded hole and a feeding pipe, the side wall of the injection cavity 201 adjacent to the nozzle 22 has a feeding hole 25, the feeding pipe extends into and communicates with the feeding hole 25, the threaded hole communicates with the feeding pipe, and the colloid flows through the threaded hole, the feeding pipe, and the feeding hole 25 and enters the injection cavity 201. The feeding threaded hole and the feeding pipeline are of a design structure with one end being larger than the other end in diameter size, feeding quantity and the quantity of colloid flowing into the feeding hole 25 are guaranteed, hydraulic pressure difference is generated by means of utilization, flowing of the colloid is promoted, and continuity of feeding is guaranteed. The split pneumatic dispensing valve 100 further comprises a glue barrel support for installing a glue barrel and providing glue for the feeding mechanism, the glue barrel is installed on the glue barrel support, and a glue outlet of the glue barrel is connected with a feeding threaded hole. The split type pneumatic dispensing valve 100 further comprises a mounting plate 6 and a connecting plate 7, the mounting plate 6 is used for fixing the split type pneumatic dispensing valve 100 at a working position, the cylinder 1 and the injection mechanism 2 are fixed on the connecting plate 7 from top to bottom, and the cylinder barrel 10 is fixed on the mounting plate 6, so that in the working process of the split type pneumatic dispensing valve 100, the positions of the cylinder 1 and the injection mechanism 2 are relatively fixed, and the stability that the first-stage valve firing pin 11 impacts the second-stage injection firing pin 21 is guaranteed. Connecting plate 7 is equipped with vertical rectangular hole 71, and injection mechanism 2 corresponds and is equipped with the mounting hole, cooperates through displacement adjusting nut and rectangular hole 71 and mounting hole and makes injection mechanism 2 be fixed in connecting plate 7, through the position of adjusting displacement adjusting nut in rectangular hole 71, changes cylinder 1 and injection mechanism 2 relative position.

Further, referring to fig. 3 and 4, the injection mechanism 2 further includes a pressing cover 24, the pressing cover 24 is fixedly connected to the injection seat 20 and covers one end of the injection cavity 201 far from the nozzle 22, the secondary injection striker 21 penetrates the pressing cover 24 and extends into the injection cavity 201, one end of the secondary injection striker 21 close to the primary valve striker 11 is provided with a striker cap 211, the first elastic member 23 is sleeved on the secondary injection striker 21, one end of the first elastic member abuts against the striker cap 211, and the other end of the first elastic member abuts against the pressing cover 24.

In the embodiment of the present invention, the cylinder 1 and the injection mechanism 2 are provided separately. When the cylinder 1 is not charged, the first elastic element 23 is compressed between the striker cap 211 and the gland 24 for driving the movement of the secondary firing pin 21. The gland 24 covers the injection seat 20 to prevent the atmosphere from entering the injection cavity 201, so that the sealing performance of the injection cavity 201 is ensured.

Further, referring to fig. 3 and fig. 4, the pressing cover 24 is provided with a limiting groove 241, the bottom wall of the limiting groove 241 is provided with a limiting hole 242, the secondary injection striker 21 penetrates through the limiting hole 242, and the first elastic element 23 is partially accommodated in the limiting groove 241.

The limiting groove 241 plays a limiting role for the bottom of the first elastic member 23, and in the process that the first-stage valve striker 11 impacts the second-stage injection striker 21, the side wall of the limiting groove 241 prevents the first elastic member 23 from leaving the limiting groove 241, so that the action effect that the first-stage valve striker 11 impacts the second-stage injection striker 21 is improved, and the stability is enhanced.

Furthermore, a limit block 12 is further connected to one end, close to the gland 24, of the cylinder 10, the first-stage valve striker 11 partially penetrates through the limit block 12, and when the first elastic member 23 drives the second-stage injection striker 21 to be away from the nozzle 22, the striker cap 211 is stopped by the limit block 12.

In the embodiment of the present invention, the cylinder 10 further includes a bottom cover fastened to an end of the cylinder 10 close to the pressing cover 24, the limiting block 12 protrudes out of an end surface of the bottom cover, and the bottom cover abuts against the limiting block 12 through a screw. The stopper 12 limits the striker cap 211, the secondary injection striker 21 moves between the nozzle 22 and the stopper 12, and the glue discharge amount can be adjusted by adjusting the displacement range of the secondary injection striker 21. The part of the primary valve firing pin 11 extending out of the limiting block 12 is small and controllable, so that the displacement of the secondary injection firing pin 21 is limited within a small threshold range, the diameter size of a glue dot sprayed out of the nozzle 22 can be in a small range, the sprayed glue dot is small, the constant high precision of the displacement of the secondary injection firing pin 21 is guaranteed, the displacement error generated by the primary valve firing pin 11 is made up, and the consistency of the glue dot sprayed out of the nozzle 22 is guaranteed.

Further, referring to fig. 3 and fig. 4 in combination, the split pneumatic dispensing valve 100 further includes a jet striker guide sleeve 4 sleeved on the secondary jet striker 21, the jet striker guide sleeve 4 is clamped between the pressing cover 24 and the jet seat 20, the jet striker guide sleeve 4 includes a connecting section 41, the connecting section 41 extends into the jet cavity 201, an outer wall of the connecting section 41 abuts against a cavity wall of the jet cavity 201, and an inner wall of the connecting section 41 abuts against the secondary jet striker 21.

The interior of the jet firing pin guide sleeve 4 is of a hollow structure, the secondary jet firing pin 21 is abutted against the inner wall of the jet firing pin guide sleeve 4, and the secondary jet firing pin 21 moves relative to the jet firing pin guide sleeve 4; the jet striker guide sleeve 4 is made of an elastic material such as PEEK, so that the deviation in the motion process of the secondary jet striker 21 is small enough, and the stability of the split pneumatic dispensing valve 100 at the jet glue point is ensured. The outer wall of the connecting section 41 abuts against the inner wall of the injection chamber 201, ensuring the tightness of the injection chamber 201. The outer wall of the connecting section 41 abuts against the inner wall of the injection cavity 201, and an interference fit can be adopted, so that the sealing performance of the injection cavity 201 is further ensured.

Further, the jet striker guide sleeve 4 further includes a limiting section 42 connected to the connecting section 41, an outer diameter of the limiting section 42 is larger than an outer diameter of the connecting section 41, an outer wall of the limiting section 42 is annularly provided with a mounting groove, a sealing ring 43 is accommodated in the mounting groove, and the sealing ring 43 abuts against a cavity wall of the jet cavity 201.

In order to fully ensure the sealing performance of the injection cavity 201, the split type pneumatic dispensing valve 100 is provided with a striker sealing ring 43, which is beneficial to non-contact injection of the colloid. The firing pin guide sleeve 4 is equivalent to a sealing cover of the injection cavity 201 seat, and the gland 24 is further buckled with the injection cavity 201 seat to ensure the sealing property inside the injection cavity 201 seat.

Further, referring to fig. 3 and 4 again, the split pneumatic dispensing valve 100 further includes a valve striker guide 14 located in the cylinder 10, and the valve striker guide 14 is sleeved on the primary valve striker 11 and is fixed relative to the cylinder 1.

The interior of the valve firing pin guide sleeve 14 is of a hollow structure, and the primary valve firing pin 11 is abutted against the inner wall of the valve firing pin guide sleeve 14 and moves relative to the valve firing pin guide sleeve 14; the valve striker guide sleeve 14 is made of an elastic material such as PEEK, so that the deviation of the primary valve striker 11 in the process of impacting the secondary injection striker 21 is small enough, the impact stability of the secondary injection striker 21 is ensured, and the stability of the split pneumatic dispensing valve 100 at the injection glue point is further ensured. The valve firing pin guide sleeve 14 is fixed inside the cylinder 1 and is abutted to the limiting block 12, and the valve firing pin guide sleeve 14 limits the primary valve firing pin 11, that is, the primary valve firing pin 11 further ensures that the deviation of the up-and-down movement process of the primary valve firing pin 11 is small and the movement is constant.

Further, referring to fig. 3, a second elastic member 13 is further disposed in the cylinder 10, the second elastic member 13 is connected to the cylinder 10, and the other end of the second elastic member is connected to the first-stage valve striker 11, when the cylinder 1 is inflated, the first-stage valve striker 11 slides relative to the cylinder 10 and elastically compresses the second elastic member 13; when the air cylinder 1 is deflated, the second elastic piece 13 drives the first-stage valve firing pin 11 to approach and impact the second-stage injection firing pin 21.

The second elastic member 13 is preferably a die spring, and the material of the die spring is generally chrome alloy steel. The chromium alloy spring steel has the characteristics of high temperature resistance, high rigidity and long service life. The second elastic member 13 has an elastic force greater than that of the first elastic member 23, so that the first-stage valve striker 11 is pressed against the striker cap 211. The cylinder 1 is a long row, the cylinder 10 is provided with an air inlet 101 for air inlet of the high-frequency electromagnetic valve, the air inlet 101 is positioned at one side of the first-stage valve firing pin 11 departing from the second elastic part 13, and air pressure generated in the cylinder 10 pushes the first-stage valve firing pin 11 and overcomes the elasticity of the second elastic part 13 to continue movement. The air inlet holes 101 are L-shaped and are arranged by adopting a thread bend, which facilitates the air to enter the cylinder 10. The first-stage valve striker 11 slides up and down on the inner wall of the cylinder 10, and has a small frictional force with the side wall of the cylinder 10 due to the action of the piston and the rod.

Further, referring to fig. 1 and 3 again, the split type pneumatic dispensing valve 100 further includes a stroke adjusting mechanism 5 connected to an end of the cylinder 10 away from the injection mechanism 2, the stroke adjusting mechanism 5 includes a stroke upper nut 51 and a stroke screw 52, one end of the stroke screw 52 is screwed to the stroke upper nut 51, the other end is movably connected to the cylinder 10 and extends into the cylinder 10, the second elastic member 13 is located between the stroke screw 52 and the first-stage valve striker 11, a stop portion 521 is disposed at an end of the stroke screw 52 close to the first-stage valve striker 11, and when the second elastic member 13 is compressed to a maximum stroke, the first-stage valve striker 11 abuts against the stop portion 521.

The upper travel nut 51 threads the exterior of the travel screw 52 and is adjacent the cylinder barrel 10. The upper stroke nut 51 is convenient to manually screw, so that the stroke screw 52 is driven to screw away from or into the cylinder barrel 10, the distance between the stroke screw 52 and the first-stage valve firing pin 11 is increased or decreased, the displacement of the first-stage valve firing pin 11 is further controlled, and one of the factors influencing the force of the first-stage valve firing pin 11 impacting the second-stage injection firing pin 21 is controlled; the magnitude of the force with which the primary valve striker 11 hits the secondary jet striker 21 is also related to the elastic force of the second elastic member 13 itself. The stroke screw 52 is provided with a hole, the first-stage valve firing pin 11 is correspondingly provided with a protrusion in a protruding manner, and the protrusion is matched with the hole correspondingly formed in the stroke screw 52 in the process of the up-and-down movement of the first-stage valve firing pin 11, so that the fixing property of the position where the first-stage valve firing pin 11 collides with the stroke screw 52 is further ensured, and the movement stability of the first-stage valve firing pin 11 is further enhanced.

Further, the stroke adjusting mechanism 5 further includes a preload screw 53, the preload screw 53 is screwed between the cylinder 10 and the stroke screw 52, the sleeve passes through the preload screw 53, and one end of the second elastic member 13 away from the first-stage valve striker 11 abuts against the preload screw 53.

Screwing the pretightening force screw 53 to enable the screwing pretightening force screw 53 to be screwed into or out of the cylinder barrel 10, so that the accommodating space of the second elastic piece 13 becomes smaller or larger, and the compression degree of the second elastic piece 13 is changed; in the process of screwing the pretightening force screw 53, the stroke screw 52 is driven to move, and then the screwing position of the stroke screw 52 and the pretightening force screw 53 is adjusted according to specific conditions, namely the stroke of the impact of the first-stage valve firing pin 11 and the impact force of the impact of the first-stage valve firing pin 11 on the second-stage injection firing pin 21 are controlled through the arrangement of the stroke screw 52 and the pretightening force screw 53. The stroke adjusting mechanism 5 further comprises a pre-tightening force sealing ring 54 sleeved on the pre-tightening force screw 53, and the pre-tightening force sealing ring 54 abuts against the inner wall of the cylinder 10 to enhance the sealing performance of the cylinder 10.

Further, referring to fig. 4, the end of the first stage valve striker 11 for striking the second stage jet striker 21 is curved.

In the invention, the first-stage valve firing pin 11 is arranged by adopting the curved circular surface, so that the first-stage valve firing pin 11 and the firing pin cap 211 are in point-to-surface contact when the first-stage valve firing pin 11 impacts the second-stage injection firing pin 21, even if the stressed point of the impacting surface of the firing pin cap 211 is slightly changed, the second-stage injection firing pin 21 can still be ensured not to be subjected to the action of shearing force, and the stability of the impacting process and the service life of the second-stage injection firing pin 21 are improved.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims

1. The utility model provides a split type pneumatic dispensing valve which characterized in that includes:

the cylinder comprises a cylinder barrel and a primary valve firing pin partially accommodated in the cylinder barrel, and the primary valve firing pin is connected with the cylinder barrel in a sliding manner; a second elastic piece is further arranged in the cylinder barrel, the second elastic piece is connected with the cylinder barrel, and the other end of the second elastic piece is connected with the first-stage valve firing pin;

the injection mechanism comprises a secondary injection firing pin, a nozzle, an injection seat and a first elastic piece, wherein the injection seat is provided with an injection cavity with two through ends, the nozzle covers one end opening of the injection cavity, the secondary injection firing pin is partially inserted into the injection cavity from one end opening of the injection cavity, one end of the first elastic piece is connected with the injection seat, the other end of the first elastic piece is connected with the secondary injection firing pin, and the first elastic piece drives the secondary injection firing pin to be far away from the nozzle; and

the feeding mechanism is used for providing colloid to the spraying cavity;

the primary valve firing pin slides relative to the cylinder barrel and impacts the secondary injection firing pin, and the secondary injection firing pin is driven by the primary valve firing pin to be close to the nozzle so as to extrude the colloid in the injection cavity out of the nozzle;

when the air cylinder is inflated, the primary valve firing pin slides relative to the cylinder barrel and enables the second elastic piece to be elastically compressed, and when the air cylinder is deflated, the second elastic piece drives the primary valve firing pin to be close to and impact the secondary injection firing pin.

2. The split type pneumatic dispensing valve of claim 1, wherein the injection mechanism further comprises a gland fixedly connected to the injection seat and covering one end of the injection cavity away from the nozzle, the secondary injection striker penetrates through the gland and extends into the injection cavity, one end of the secondary injection striker, which is close to the primary valve striker, is provided with a striker cap, the first elastic member is sleeved on the secondary injection striker, one end of the first elastic member abuts against the striker cap, and the other end of the first elastic member abuts against the gland.

3. The split type pneumatic dispensing valve of claim 2, wherein the pressing cover is provided with a limiting groove, the bottom wall of the limiting groove is provided with a limiting hole, the secondary injection firing pin penetrates through the limiting hole, and the first elastic part is partially accommodated in the limiting groove.

4. The split pneumatic dispensing valve of claim 2, wherein a stop block is further connected to one end of the cylinder barrel close to the gland, the first-stage valve firing pin partially penetrates through the stop block, and when the first elastic member drives the second-stage injection firing pin to be away from the nozzle, the firing pin cap is stopped by the stop block.

5. The split type pneumatic dispensing valve of claim 2, further comprising a jet striker guide sleeve sleeved on the secondary jet striker, wherein the jet striker guide sleeve is clamped between the gland and the jet seat, the jet striker guide sleeve comprises a connecting section, the connecting section extends into the jet cavity, the outer wall of the connecting section abuts against the cavity wall of the jet cavity, and the inner wall of the connecting section abuts against the secondary jet striker.

6. The split type pneumatic dispensing valve of claim 5, wherein the injection firing pin guide sleeve further comprises a limiting section connected with the connecting section, the outer diameter of the limiting section is larger than that of the connecting section, an installation groove is annularly formed in the outer wall of the limiting section, a sealing ring is arranged in the installation groove, and the sealing ring abuts against the wall of the injection cavity.

7. The split-type pneumatic dispensing valve of claim 1, further comprising a stroke adjustment mechanism connected to an end of the cylinder away from the injection mechanism, wherein the stroke adjustment mechanism comprises a stroke upper nut and a stroke screw, one end of the stroke screw is screwed to the stroke upper nut, the other end of the stroke screw is movably connected to the cylinder and extends into the cylinder, the second elastic member is located between the stroke screw and the first-stage valve striker, a stop portion is disposed at an end of the stroke screw close to the first-stage valve striker, and when the second elastic member is compressed to a maximum stroke, the first-stage valve striker abuts against the stop portion.

8. The split pneumatic dispensing valve of claim 7, wherein the stroke adjustment mechanism further comprises a pre-load screw,

the pre-tightening force screw is sleeved on the periphery of the stroke screw and is in threaded connection between the cylinder barrel and the stroke screw, and one end, far away from the primary valve firing pin, of the second elastic piece abuts against the pre-tightening force screw.

9. The split pneumatic dispensing valve of claim 1, wherein one end of the primary valve firing pin for striking the secondary injection firing pin is arranged in a curved surface.