CN210546040U

CN210546040U - Dispensing valve

Info

Publication number: CN210546040U
Application number: CN201920915077.XU
Authority: CN
Inventors: 黄亮
Original assignee: Shenzhen Hui'an Tong Technology Co ltd
Current assignee: Shenzhen Hui'an Tong Technology Co ltd
Priority date: 2019-06-15
Filing date: 2019-06-15
Publication date: 2020-05-19
Anticipated expiration: 2029-06-15

Abstract

The utility model relates to a dispensing valve, include: the reciprocating mechanism comprises a piston and a firing pin, the firing pin comprises a large end, a small end and a middle end which extend outwards in sequence, and the piston guides the firing pin to reciprocate; the control cavity is provided with a glue inlet, a glue outlet and a firing pin port, the firing pin penetrates through the control cavity from the firing pin port, the large end and the firing pin port are sealed and telescopic, and the middle end extends out of the control cavity; the elastic sealing ring is fixed at the glue inlet, a glue outlet gap is formed between the elastic sealing ring and the small end, the middle end and the glue inlet are sealed and stretched to open or close the glue outlet gap, and when the large end retracts along the needle striking opening, the middle end retracts along the needle striking opening to reduce the volume of the striking needle in the control cavity. The dispensing valve of the utility model has the advantages of glue resorption, convenient assembly, strong sealing performance and the like.

Description

Dispensing valve

Technical Field

The utility model relates to an equipment technical field is glued to the point, especially relates to a valve is glued to point.

Background

The dispensing equipment is an automatic equipment which controls fluid and drips or coats the fluid on the surface of a product or in the product according to a certain rule. The dispensing valve is a core component in the dispensing equipment.

The existing dispensing valve is generally divided into a single-liquid dispensing valve and a double-liquid dispensing valve according to the output glue, and the glue flowing out of the single-liquid dispensing valve can be naturally solidified after a period of time or is accelerated to solidify under heating. The double-liquid dispensing valve is special equipment for dispensing double-component glue (generally called AB glue), and the two liquid phases of the double-component glue can be mixed and solidified, so that the phenomenon that a glue channel in the dispensing valve is narrowed or even blocked due to the fact that the glue is solidified in the dispensing valve is avoided.

The existing dispensing valve is frequently used for dispensing glue, and the problems of glue remained on a needle head after dispensing and wire drawing during dispensing are often caused. Glue is remained on the needle head, part of the glue can drip on a product or a jig due to the action of gravity, and part of the glue can cause the reduction of glue yield due to solidification, thereby affecting the quality of the product and even blocking the needle head or the needle tube; the drawn wires are generated when the needle head moves, and the dispensing effect can be influenced if the drawn wires are stuck on the adhesive.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide a dispensing valve with suck-back function.

In order to solve the technical problem, the utility model discloses a technical scheme be: a dispensing valve comprising: the reciprocating mechanism comprises a piston and a firing pin, the firing pin comprises a large end, a small end and a middle end which extend outwards in sequence, and the piston guides the firing pin to reciprocate; the control cavity is provided with a glue inlet, a glue outlet and a firing pin port, the firing pin penetrates through the control cavity from the firing pin port, the large end and the firing pin port are sealed and telescopic, and the middle end extends out of the control cavity; the elastic sealing ring is fixed at the glue inlet, a glue outlet gap is formed between the elastic sealing ring and the small end, the middle end and the glue inlet are sealed and stretched to open or close the glue outlet gap, and when the large end retracts along the needle striking opening, the middle end retracts along the needle striking opening to reduce the volume of the striking needle in the control cavity.

Furthermore, an inclined transition section is arranged between the large end and the small end, and an inclined transition section is arranged between the small end and the middle end.

Further, the reciprocating mechanism is provided with a stroke adjusting mechanism.

Further, the reciprocating mechanism is provided with a firing pin initial position adjusting mechanism.

Further, a large end sealing element which is matched and sealed with the large end is arranged between the needle striking opening and the needle striking.

Further, the big end sealing member includes that annular seal fills up and annular seal lid, annular seal fills up and is equipped with V type bulge loop, annular seal lid is equipped with range upon range of V type recess on the V type bulge loop, the degree of depth of V type recess is greater than the height of V type bulge loop, big end sealing member top is equipped with the extrusion annular seal lid makes the expanded gland of V type recess.

Furthermore, an expansion ring groove is formed in the middle of the V-shaped groove, and the V-shaped top of the V-shaped convex ring is a plane.

Furthermore, the big end sealing element also comprises at least one V-shaped sealing body arranged between the annular sealing cover and the annular sealing gasket, and one surface of the V-shaped sealing body is provided with the V-shaped groove and the other surface is provided with the V-shaped convex ring.

Furthermore, the outer ring of the elastic sealing ring is provided with an annular groove which is convenient for the middle end to retract inwards.

The beneficial effects of the utility model reside in that: when the middle end is in contact sealing with the elastic sealing ring and continues to retract, the volume of the large end extending out of the control cavity is reduced, the glue inlet channel is sealed by the middle end and the elastic sealing ring in sealing fit, the diameter of the middle end is smaller than that of the large end, so that the volume of the firing pin in the glue output port is reduced, the volume reduction is equal to the volume reduction of the large end minus the volume increase of the middle end, negative pressure can be generated in the volume, the glue inlet channel is sealed by the middle end and the elastic sealing ring in sealing fit, and the volume is filled by pouring the glue in the needle nozzle communicated with the glue outlet, so that the suck-back effect is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a dispensing valve according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a control chamber of a dispensing valve according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a reciprocating mechanism of a dispensing valve according to an embodiment of the present invention;

fig. 4 is a schematic view of a big-end seal of a dispensing valve according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a large-end sealing member of a dispensing valve according to an embodiment of the present invention.

Description of reference numerals:

100. a top cover; 200. a top seat; 210. a mounting cavity; 220. a projection; 300. a reciprocating mechanism;

310. a piston; 320. a striker; 321. a large end; 322. a small end; 323. a middle end;

324. a tilt transition section; 330. a stroke adjustment mechanism; 331. a stroke adjusting rod;

332. a stroke adjusting knob; 340. a striker initial position adjusting mechanism; 341. a position adjusting tube;

342. a position adjusting knob; 350. a locking member; 400. a middle seat; 410. a control chamber;

411. a glue inlet; 412. a glue outlet; 413. a needle striking opening; 420. a first ring groove;

430. a second ring groove; 440. a third ring groove; 500. a gland; 600. an elastic sealing ring;

700. a big end seal; 710. an annular seal; 711. a V-shaped convex ring; 720. an annular seal cover;

721. a V-shaped groove; 722. expanding the ring groove; 730. a V-shaped sealing body; 800. a base;

810. a glue injection channel; 820. a glue outlet channel; 900. a needle mouth.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the following description, with reference to the accompanying drawings and embodiments, will explain in further detail a dispensing valve of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1-3, a dispensing valve includes: the reciprocating mechanism 300, the reciprocating mechanism 300 includes a piston 310 and a striker 320, the striker 320 includes a large end 321, a small end 322 and a middle end 323 which extend outwards in sequence, the piston 310 guides the striker 320 to reciprocate; the control cavity 410 is provided with a glue inlet 411, a glue outlet 412 and a striker hole 413, the striker 320 penetrates through the control cavity 410 from the striker hole 413, the large end 321 and the striker hole 413 are sealed and telescopic, and the middle end 323 extends out of the control cavity 410; the elastic sealing ring 600 is fixed at the glue inlet 411, a glue outlet gap is formed between the elastic sealing ring 600 and the small end 322, the middle end 323 and the glue inlet 411 are sealed and stretched to open or close the glue outlet gap, and when the large end 321 is retracted along the striker opening 413, the middle end 323 is retracted along the striker opening 413 so that the volume of the striker 320 in the control cavity 410 is reduced.

When the middle end 323 is in contact sealing with the elastic sealing ring 600 and continues to retract, the volume of the large end 321 extending out of the control cavity 410 is reduced, the volume reduction amount is equal to the volume reduction amount of the large end 321 minus the volume increase amount of the middle end 323, the volume reduction amount is equal to the volume reduction amount of the large end 321 minus the volume increase amount of the large end 323, negative pressure is generated in the volume reduction amount, and the middle end 323 is in sealing fit with the elastic sealing ring 600 to close the glue inlet channel, so that the volume reduction amount is filled by pouring glue in the needle nozzle 900 communicated with the glue outlet 412, and the suck-back effect is achieved.

It will be appreciated that the diameters of the large end 321, the medium end 323 and the small end 322 decrease in sequence.

Preferably, the plunger 310 directly guides the striker 320 for reciprocation, or the striker 320 reciprocates through a connection with the plunger. It is understood that the reciprocating mechanism 300 is one of a pneumatic drive, an electric drive, an electromagnetic drive, and a hydraulic drive, and preferably is a pneumatic drive.

Referring to fig. 1 and 3, an inclined transition section 324 is disposed between the large end 321 and the small end 322, and an inclined transition section 324 is disposed between the small end 322 and the middle end 323.

The inclined transition section 324 facilitates the glue to flow into the cavity and has a buffer effect; the middle end 323 can be conveniently retracted into the elastic sealing ring 600; the two ends of the small end 322 are excessively inclined, so that the glue can smoothly circulate, the excessive pressure at the joint is avoided, and the service life of the firing pin is prolonged; the matching stroke adjusting mechanism 330 can control the output quantity of the glue more conveniently and accurately.

Referring to fig. 1 and 3, the reciprocating mechanism 300 is provided with a stroke adjustment mechanism 330.

A stroke adjusting mechanism 330 is provided to adjust the stroke of the striker 320 so as to adjust the glue discharging amount.

Referring to fig. 1 and 3, the reciprocating mechanism 300 is provided with a striker initial position adjusting mechanism 340.

The striker initial position adjusting mechanism 340 is arranged, when the reciprocating stroke is determined, the initial position of the striker 320 is adjusted, the retraction distance is adjusted, the relative position and the relative retraction position of the middle end 323 separated from the elastic sealing ring 600 are adjusted, the minimum volume of the striker 320 in the control cavity 410 is changed, the suck-back amount is adjusted, the glue flow is changed, and the glue output amount is adjusted.

The stroke adjusting mechanism 330 and the striker initial position adjusting mechanism 340 are matched with each other to adjust the glue flow, so that the glue adjusting range is increased, and two different adjusting mechanisms are thick and fine, so that the adjustment is convenient.

Referring to fig. 1, a large end sealing member 700 is disposed between the striker opening 413 and the striker 320 to cooperate and seal with the large end 321.

The large end seal 700 is provided to provide a better seal between the control chamber 410 and the striker 320. The big-end sealing member 700 is connected with the control cavity 410, the control cavity 410 is communicated with the external atmosphere through the glue outlet 412, and no matter the dispensing valve is in an open or closed state, the pressure born by the big-end sealing member 700 is small, so that the service life of the big-end sealing member 700 can be effectively prolonged. It will be appreciated that the firing pin 320 is of uniform length in the large end seal 700, i.e., the large end 321 is longer than the large end seal 700, and that the large end seal 700 always seals around the large end 321 when telescoping.

Referring to fig. 4 and 5, the sealing member includes an annular sealing gasket 710 and an annular sealing cover 720, the annular sealing gasket 710 has a V-shaped protrusion ring 711, the annular sealing cover 720 has a V-shaped groove 721 stacked on the V-shaped protrusion ring 711, the depth of the V-shaped groove 721 is greater than the height of the V-shaped protrusion ring 711, and a pressing cover 500 for pressing the annular sealing cover 720 to expand the V-shaped groove 721 is disposed above the sealing member.

The annular sealing gasket 710 and the matched annular sealing cover 720 are arranged, the gland 500 is pressed, the V-shaped groove 721 of the annular sealing cover 720 is expanded, the volumes of the annular sealing gasket 710 and the annular sealing cover 720 can be pressed to increase the cross section, and the annular sealing gasket 710 and the annular sealing cover 720 are connected with the large end 321 more tightly, so that the sealing performance is better.

Referring to fig. 4 and 5, the middle of the V-shaped groove 721 is provided with an expansion ring groove 722, and the V-shaped top of the V-shaped protruding ring 711 is flat.

The expanding ring groove 722 can facilitate the sealing of the annular sealing cover 720 with the large end 321 more tightly during expansion, and increase the depth of the V-shaped groove 721, so that the V-shaped groove 721 can be more tightly attached to the V-shaped convex ring 711.

Referring to fig. 4 and 5, the sealing member further includes at least one V-shaped sealing body 730 disposed between the annular sealing cover 720 and the annular sealing gasket 710, wherein one surface of the V-shaped sealing body 730 is provided with a V-shaped groove 721, and the other surface is provided with a V-shaped protruding ring 711.

The V-shaped sealing body 730 is arranged for multi-layer sealing, so that the sealing effect is further improved, and the large end 321 can slide in a telescopic mode conveniently. Preferably, three V-seals 730 are stacked on each other.

Preferably, the outer ring of the elastic sealing ring 600 is provided with an annular groove facilitating the inward retraction of the middle end 323.

The annular groove is formed, so that the middle end 323 can retract conveniently, the middle end 323 retracts and extends more smoothly, and the elastic performance of the elastic sealing ring 600 is improved.

Preferably, the elastomeric seal ring 600 and/or the big end seal 700 is a hard elastomeric seal ring 600, such as a seal ring made of polytetrafluoroethylene. While sealing is ensured, smooth sliding is ensured.

Referring to fig. 1-5, the dispensing valve includes a top seat 200, the top seat 200 has a mounting cavity 210 therein, a plunger 310 is located in the mounting cavity 210, and a striker 320 is connected to a movable end of the plunger 310. The middle seat 400 is arranged below the top seat 200, a first ring groove 420 for accommodating the gland 500 is arranged in the middle seat 400, the top seat 200 is provided with a protruding part 220 protruding into the first ring groove 420, the first ring groove 420 is communicated with a second ring groove 430 for accommodating the large-end sealing element 700, the top seat 200 is connected with the middle seat 400, so that the protruding part 220 extrudes the gland 500, the gland 500 extrudes the large-end sealing element 700, and the V-shaped groove 721 is opened, so that the large-end sealing element 700 and the large end 321 of the firing pin 320 form tight seal. The lower part of the second annular groove 430 is communicated with the control cavity 410, and the control cavity 410 is connected with the needle nozzle 900 in a normally open manner through the glue outlet 412 on the side surface. A third annular groove 440 is arranged below the control cavity 410, a base 800 is connected below the middle seat 400, a glue injection channel 810 is arranged in the base 800, the glue injection channel 810 is connected with the control cavity 410, and the elastic sealing ring 600 is fixed by the third annular groove 440 and the base 800 in an extruding mode; the base 800 is provided with a glue outlet channel 820, one end of the glue outlet channel 820 is connected to the glue outlet 412 of the control cavity 410, and the other end is connected to the needle nozzle 900.

The large end 321 of the striker 320 is in sliding sealing fit with the large end sealing member 700, a glue outlet gap is formed between the small end 322 and the elastic sealing ring 600, and the middle end 323 controls the opening and closing of the glue outlet gap through reciprocating motion. It will be appreciated that the large end 321 needs to remain extended all the way into the control chamber 410 to avoid loosening of the large end seal 700. The middle end 323 and the large end 321 are retracted simultaneously, the volume of the striker 320 in the control chamber 410 is reduced, and a negative pressure is generated to suck back the glue in the needle nozzle 900 communicated with the glue outlet 412. The end of the middle end 323 away from the small end 322 is curved to facilitate the middle end 323 extending beyond the elastic sealing member during assembly.

A stroke adjusting mechanism 330, in which a stroke adjusting rod 331 is provided in the piston 310, for adjusting the volume of the piston 310, thereby adjusting the reciprocating stroke; the end of the stroke adjustment rod 331 remote from the piston 310 is provided with a stroke adjustment knob 332.

The striker initial position adjusting mechanism 340 is characterized in that a top cover 100 is arranged at one end of the top base 200 far away from the middle base 400, a screw hole is formed in the top cover 100, a position adjusting tube 341 is sleeved in the screw hole, a stroke adjusting rod 331 is sleeved in the position adjusting tube 341, the position adjusting tube 341 is in sealing threaded connection with the top cover 100, and the stroke adjusting rod 331 is in sealing threaded connection with the position adjusting tube 341. The lower end of the position adjusting tube 341 is expanded to form an expanded lower end to abut against the top cap 100, thereby preventing the position adjusting tube 341 from separating from the top cap 100. The position adjusting pipe is fixedly connected with a position adjusting knob 342. The position adjusting tube 341 abuts against or is fixedly connected to the top of the piston 310, and adjusts the position of the piston 310 in the installation cavity 210 so as to adjust the initial position of the striker 320. The position adjusting tube 341 is sleeved with a locking member 350 for locking the adjusted position adjusting tube 341.

In summary, when the middle end is in contact with the elastic sealing ring for sealing and continues to retract, the volume of the large end extending out of the control cavity is reduced, the middle end is in sealing fit with the elastic sealing ring to seal the glue inlet channel, and the diameter of the middle end is smaller than that of the large end, so that the volume of the firing pin in the glue outlet is reduced, the volume reduction is equal to the volume reduction of the large end minus the volume increase of the middle end, negative pressure is generated in the volume, and the glue inlet channel is sealed by the middle end in sealing fit with the elastic sealing ring, so that the volume is filled by pouring the glue in the needle nozzle communicated with the glue outlet, and the suck-back effect is achieved. Under the condition that the stroke of the reciprocating mechanism is fixed, the relative separation position and the relative retraction position of the middle end of the firing pin and the elastic sealing ring can be controlled by adjusting the initial position of the reciprocating mechanism, so that the flow of the glue passing through the elastic sealing ring can be adjusted. The stroke of the reciprocating mechanism can be adjusted to control the glue discharging amount under the condition that the initial position of the reciprocating mechanism is fixed. The flow and the suck-back amount of the glue dispensing valve can be adjusted. Additionally, the utility model discloses link to each other the main aspects sealing member with the firing pin with a mouthful, go out to glue the mouth because communicate with each other with outside atmospheric pressure, no matter the dispensing valve is opening or the closed condition, and the pressure that the second sealing member bore is less, can effectively improve the life of main aspects sealing member. The utility model also optimizes the structure of the elastic sealing ring and the big end sealing element, and improves the sealing performance; the assembly and the sealing structure of the dispensing valve are considered on the whole, so that the assembly is convenient and the sealing performance is ensured.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above description in any form, and although the present invention has been disclosed with reference to the preferred embodiment, it is not limited to the present invention, and any skilled person in the art can make modifications or changes equivalent to the equivalent embodiment of the above embodiments without departing from the scope of the present invention.

Claims

1. A dispensing valve, comprising:

the reciprocating mechanism comprises a piston and a firing pin, the firing pin comprises a large end, a small end and a middle end which extend outwards in sequence, and the piston guides the firing pin to reciprocate;

the control cavity is provided with a glue inlet, a glue outlet and a firing pin port, the firing pin penetrates through the control cavity from the firing pin port, the large end and the firing pin port are sealed and telescopic, and the middle end extends out of the control cavity;

the elastic sealing ring is fixed at the glue inlet, a glue outlet gap is formed between the elastic sealing ring and the small end, the middle end and the glue inlet are sealed and stretched to open or close the glue outlet gap, and when the large end retracts along the needle striking opening, the middle end retracts along the needle striking opening to reduce the volume of the striking needle in the control cavity.

2. The dispensing valve of claim 1, wherein an inclined transition section is provided between the large end and the small end, and an inclined transition section is provided between the small end and the middle end.

3. A dispensing valve according to claim 1, wherein the reciprocator is provided with a stroke adjustment mechanism.

4. The dispensing valve of claim 1, wherein said shuttle mechanism is provided with a striker home position adjustment mechanism.

5. The dispensing valve of claim 1, wherein a large end sealing member is disposed between the needle striking opening and the needle striking member to cooperate and seal with the large end.

6. The dispensing valve according to claim 5, wherein the large-end sealing element comprises an annular sealing gasket and an annular sealing cover, the annular sealing gasket is provided with a V-shaped convex ring, the annular sealing cover is provided with a V-shaped groove stacked on the V-shaped convex ring, the depth of the V-shaped groove is larger than the height of the V-shaped convex ring, and a gland which presses the annular sealing cover to expand the V-shaped groove is arranged above the large-end sealing element.

7. The dispensing valve of claim 6, wherein the V-shaped groove has an expansion ring groove in the middle, and the top of the V-shaped protruding ring is flat.

8. The dispensing valve according to claim 6 or 7, wherein the large-end sealing element further comprises at least one V-shaped sealing body arranged between the annular sealing cover and the annular sealing gasket, one surface of the V-shaped sealing body is provided with the V-shaped groove, and the other surface of the V-shaped sealing body is provided with the V-shaped convex ring.

9. The dispensing valve of claim 1, wherein the outer ring of the elastic sealing ring is provided with an annular groove for facilitating retraction of the middle end.