CN214554902U - High-viscosity glue micro-metering valve for dispenser - Google Patents

Abstract

The utility model discloses a point gum machine is with high viscosity glue micro-metering valve solves prior art point gum machine and when using high viscosity glue solution, has that the glue solution flows smoothly, the disconnected glue, goes out the not easily controlled, the accuracy of glue volume low, advance the technical problem that glue volume is inhomogeneous, easy wearing and tearing. The utility model provides a high viscosity glue micro-metering valve for dispenser, including controller, valve seat body, drive arrangement, transmission and micro-metering device, the valve seat body includes upper bracket, well valve body and lower valve body from top to bottom in proper order, micro-metering device locates the lower part of valve seat body; the micro-metering device comprises a vertical metering cavity arranged in the middle valve body, a metering glue inlet channel communicated with the metering cavity is further arranged on the side wall of the middle valve body, a servo motor arranged on the upper bracket is conducted to the lead screw when rotating, and the lead screw nut moves up and down to drive the plunger rod and the plunger to move up and down simultaneously in the metering cavity. But wide application in point gum machine measurement technical field.

Description

High-viscosity glue micro-metering valve for dispenser

Technical Field

The utility model relates to a point gum machine measures technical field, specifically is a point gum machine is with high viscosity glue micro-metering valve.

Background

The current domestic glue dispenser consists of a controller, an air compressor and an injection needle tube, and is widely used for potting, fixing and coating processes in the electronic industry. When the pneumatic dispenser works, the piston is pushed to move forward by compressed air generated by the air compressor, and the controller adjusts the glue discharging amount and prevents dripping leakage by controlling the size, duration and positive and negative directions of air pressure of the compressed air. The working mode is to configure an air compressor or build an air compression station at first, and the pipeline is complicated.

Secondly, the compressed gas has elastic property, and accurate control has certain degree of difficulty, and the high frequency reciprocating motion of piston is inevitable to have the glue solution to soak the pressure chamber of piston, and inevitably will have the glue solution to be inhaled in the control solenoid valve when the pressure chamber is the negative pressure, makes the point gum machine normally work. In practical work, the problems of unsmooth flowing of glue solution, glue breaking, difficulty in controlling glue yield and the like exist when a plurality of glue dispensers use high-viscosity glue solution.

In addition, the existing locking closing colloid adopts a slide valve, and high-viscosity colloid fluid repeatedly closes throttling, so that the valve part is easily damaged by friction. Most of dispensing machines in the prior art are screw type dispensing machines, which not only have slow dispensing speed, but also have very large limitation on the viscosity requirement of materials, and can not dispense glue accurately and efficiently on high-viscosity glue. Particularly, in the field of the dispenser with higher requirement on the micro glue output, such as the field of electronic components, the dispenser in the prior art cannot meet the requirement on high precision. It is therefore a task for the skilled person to develop a new dispenser that can accommodate highly viscous glue solutions.

SUMMERY OF THE UTILITY MODEL

The utility model discloses shortcoming and not enough to exist among the prior art, the utility model provides a can realize that high accuracy trace goes out to glue, the trace that especially is fit for the high viscosity colloid goes out to glue, the glue solution flows smoothly, the volume of going out is easily controlled, it is even to advance the volume of gluing, not fragile, long service life's point gum machine high viscosity glue trace metering valve.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: the utility model provides a high viscosity glue micro-metering valve for point gum machine, including controller, disk seat body, drive arrangement, transmission and micro-metering device, micro-metering device's bottom is installed bottom and is gone out gluey syringe needle device, and disk seat body from the top down includes upper bracket, well valve body and lower valve body in proper order, and micro-metering device locates the lower part of disk seat body: the middle valve body and the lower valve body;

the micro-metering device comprises a vertical metering cavity arranged in a middle valve body, a metering glue inlet channel communicated with the metering cavity is further arranged on the side wall of the middle valve body, a servo motor, a lead screw nut and a plunger rod are arranged on an upper bracket, the servo motor is connected with the lead screw through a coupler, the servo motor is conducted to the lead screw when rotating, and the lead screw nut moves up and down to drive the plunger rod and the plunger to move up and down simultaneously in the metering cavity.

Preferably, the on-off device at the front end of the micro-metering cavity is pneumatically controlled and comprises a sealed air chamber arranged at the bottom of the lower valve body, a second sealing piston matched with the sealed air chamber is arranged in the sealed air chamber, a spring device is fixedly arranged at the upper part of the second sealing piston, an air inlet channel is also arranged on the side wall of the sealed air chamber and positioned at the lower part of the second sealing piston, the on-off of air entering from the air inlet channel is controlled by a controller, the air entering the sealed air chamber exerts pressure on the bottom surface of the second sealing piston to jack the second sealing piston, and the spring device is compressed;

a circular ring-shaped collision core is embedded in the upper surface of the second sealing piston, a vertical first through hole is formed in the middle of the collision core, a needle seat of a needle head device with a glue outlet at the bottom end is embedded in the bottom of the first through hole of the collision core, a first annular groove with the inner diameter larger than that of the first through hole is further formed in the upper end of the collision core, and the inner diameter of the first annular groove is larger than that of the metering cavity; an annular ball collision sealing gasket matched with the collision core is embedded in the bottom of the middle valve body, a second through hole matched with the inner diameter of the metering cavity is formed in the middle of an upper cover of the ball collision sealing gasket, and a second annular groove with the inner diameter larger than that of the second through hole is formed in the bottom of the ball collision sealing gasket; the second annular groove is internally provided with a collision ball, the diameters of the collision ball are larger than the inner diameter of the metering cavity and the inner diameter of the first through hole of the collision core and smaller than the inner diameter of the first annular groove, after the middle valve body and the lower valve body are installed together, the upper part of the collision core is clamped in the second annular groove, and a gap is formed between the top end of the collision core and the top end of the second annular groove; the first annular groove of the collision core and the upper cover of the collision ball sealing gasket limit the collision ball between the first through hole of the first annular groove and the second through hole of the collision ball sealing gasket, and the collision ball is not contacted with the inner side wall of the bottom of the second through hole of the collision ball sealing gasket;

when the bottom of the second sealing piston moves upwards after being subjected to upward air pressure, the collision core also moves upwards together with the second sealing piston, and the top end of the collision core is contacted with the top end of the second annular groove, so that the collision ball is forced to completely block the bottom of the second through hole of the collision ball sealing gasket.

Preferably, the outer diameter of the plunger is matched with the inner diameter of the metering cavity and is not attached to the metering cavity.

Preferably, a first sealing device is fixedly arranged between the upper end of the middle valve body, the plunger rod and the metering cavity and comprises a sealing adjusting wire, and a V-shaped sealing gasket and a V-shaped sealing seat which are positioned on the upper part of the metering glue inlet channel and fixedly arranged on the middle valve body.

Preferably, a third sealing ring device matched with the striking core is further arranged around the striking core between the striking ball sealing gasket and the upper surface of the second sealing piston, and the third sealing ring device is a universal sealing ring.

Preferably, a fourth sealing ring device is also fixedly arranged between the needle seat of the needle head device with the glue outlet at the bottom end and the inner side wall of the collision core.

Preferably, the bottom of the lower valve body is provided with an air chamber cover which is detachably connected with the lower valve body in a sealing manner.

Preferably, the glue outlet needle device at the bottom end of the lower valve body is fixedly connected with the bottom of the air chamber cover through a needle gland ring.

Preferably, the inner side wall of the upper support is further provided with a limiting slide rail matched with the screw rod nut, and the screw rod nut slides on the limiting slide rail in a limiting manner through the slide rail nut.

Preferably, the ball is made of SSiC material, and the ball gasket is made of POM material.

The utility model provides a high viscosity glue micro-metering valve for point gum machine. The method has the following beneficial effects:

(1) the utility model discloses a point gum machine is with high viscosity glue trace metering valve, the small and exquisite compactness of device structure, it is small, can realize that the high accuracy trace goes out to glue, especially be fit for the trace of high viscosity colloid and go out to glue, make its glue solution flow smoothly, go out the volume easily control and even, ensure that whole point is glued continuously going on of process, ensure the processingquality of high viscosity colloid work piece.

(2) The utility model discloses a point gum machine is with high viscosity glue micro-metering valve, the whole pump valve is sealed effectual, from the colloid of the whole metering device of all-round protection from the measuring chamber to the leakproofness of syringe needle, ensures the accurate micro-control of whole volume of gluing.

(3) The utility model discloses a point gum machine is with high viscosity glue micro-metering valve, stand wear and tear ability reinforce, long service life, especially hit the structural design of ball department, in the use, hit the ball sealed pad and hit the friction between the ball and can not restrict a bit, but rather than the bottom edge random contact of second through-hole, show the change cycle of extension vulnerable part, save cost of maintenance, improve work efficiency simultaneously.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the present invention (with the front panel removed);

FIG. 3 is a schematic structural diagram of a top view of FIG. 1;

FIG. 4 is a schematic structural view of a cross-sectional view F-F shown in FIG. 3;

FIG. 5 is a partially enlarged view of A in FIG. 4;

fig. 6 is a schematic structural view of a partially enlarged view B in fig. 5.

In the figure: 1. the device comprises a needle head device with a glue outlet at the bottom end, 101 a needle seat, 2 an upper support, 3 a middle valve body, 4 a lower valve body, 5 a metering cavity, 6 a metering glue inlet channel, 7 a servo motor, 8 a lead screw, 9 a lead screw nut, 10 a plunger rod, 11 a sealed air chamber, 12 a second sealed piston, 13 a spring device, 14 a collision core, 1401 a first annular groove, 1402 a first through hole, 15 a collision ball, 16 a collision ball sealing gasket, 1601 a second through hole, 1602 a second annular groove, 17 a first sealing device, 18 a third sealing ring device, 19 a fourth sealing ring device, 20 an air chamber cover, 21 a limiting sliding rail, 22 a sliding rail female screw and 23 an air inlet channel.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection, or as an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-4, the present invention provides a technical solution:

the utility model provides a high viscosity glue micro-metering valve for point gum machine, including controller, disk seat body, drive arrangement, transmission and micro-metering device, micro-metering device's bottom is installed bottom and is gone out gluey syringe needle device 1, and disk seat body from the top down includes upper bracket 2, well valve body 3 and lower valve body 4 in proper order, and micro-metering device locates the lower part of disk seat body: the middle valve body 3 and the lower valve body 4;

the micro-metering device comprises a vertical metering cavity 5 arranged inside a middle valve body 3, a metering cavity glue inlet channel 6 communicated with the metering cavity 5 is further arranged on the side wall of the middle valve body 3, a servo motor 7, a lead screw 8, a lead screw nut 9 and a plunger rod 10 are arranged on an upper support 2, the servo motor 7 is connected with the lead screw 8 through a coupler, the servo motor 7 is transmitted to the lead screw 8 when rotating, and the lead screw nut 9 moves up and down to drive the plunger rod 10 and the plunger to move up and down simultaneously in the metering cavity 5.

The micro-metering device is pneumatically controlled and comprises a sealing air chamber 11 arranged at the bottom of the lower valve body 4, a second sealing piston 12 matched with the sealing air chamber 11 is installed in the sealing air chamber 11, spring devices 13 which are circumferentially distributed are fixedly arranged on the upper portion of the second sealing piston 12, an air inlet channel 23 is further arranged on the side wall of the sealing air chamber 11 and positioned at the lower portion of the second sealing piston 12, the pressure of air entering from the air inlet channel 23 is controlled through a controller, the air entering the sealing air chamber 11 is used for pressing the bottom surface of the second sealing piston 12 and is jacked upwards, and meanwhile, the spring devices 13 are compressed to enable the second sealing piston to be in a glue-out state.

The upper surface of the second sealing piston 12 is internally embedded with an annular collision core 14, the middle of the collision core 14 is provided with a vertical first through hole 1402, the bottom of the first through hole 1402 of the collision core 14 is embedded with a needle seat 101 of the needle head device 1 with glue discharged from the bottom end, the upper end of the collision core is also internally provided with a first annular groove 1401 with the inner diameter larger than that of the first through hole 1402, and the inner diameter of the first annular groove 1401 is larger than that of the metering cavity 5; an annular ball striking sealing gasket 16 matched with the striking core 14 is further embedded in the bottom of the middle valve body 3, a second through hole 1601 matched with the inner diameter of the metering cavity 5 is formed in the middle of an upper cover of the ball striking sealing gasket 16, and a second annular groove 1602 with the inner diameter larger than that of the second through hole 1601 is arranged in the bottom of the ball striking sealing gasket 16; the second annular groove 1602 is also internally provided with a collision ball 15, the diameters of which are both larger than the inner diameter of the metering cavity 5 and the inner diameter of the first through hole 1402 of the collision core and smaller than the inner diameter of the first annular groove 1401, after the middle valve body 3 and the lower valve body 4 are installed together, the upper part of the collision core 14 is clamped in the second annular groove 1602, and a gap is arranged between the top end of the collision core 14 and the top end of the second annular groove 1602; the first annular groove 1401 of the plunger 14 and the upper cover of the ball striking gasket 16 confine the ball striking 15 between the first through hole 1402 of the first annular groove 1401 and the second through hole 1601 of the ball striking gasket 16, and the ball striking 15 is not in contact with the inner side wall of the bottom of the second through hole 1601 of the ball striking gasket, and is in a glue discharging state.

When the bottom of the second sealing piston 12 is subjected to upward air pressure and moves upward, the plunger 14 moves upward together with the second sealing piston, the top end of the plunger 14 contacts with the top end of the second annular groove 1602, and the ball 15 is forced to completely block the bottom of the second through hole 1601 of the ball plunger seal 16, so that the second through hole is in a glue-out state.

The outer diameter of the plunger is matched with the inner diameter of the metering cavity 5 and is not attached to the metering cavity. When the plunger got into measurement intracavity 5, the wearing and tearing of plunger can be effectively prevented in the clearance of the lateral wall of plunger and the inside wall of measurement chamber 5, and increase of service life ensures that whole metering device's measurement goes out to glue and continuously effectively goes on.

The specific using process is as follows:

(1) and (3) an idle discharge process: the matching of the servo motor 7, the lead screw 8 and the lead screw nut 9 is controlled by a controller, the up-down movement distance of the plunger rod 10 and the plunger is accurately controlled, after the plunger is lifted to a preset position before rubber feeding, the collision ball 15 is not in contact with the inner side wall of the bottom of the second through hole 1601 of the collision ball sealing gasket 16 at the moment, and the plunger is in a rubber discharging state at the moment; pumping the measured glue volume into a metering cavity 5 through a metering glue inlet channel 6, and finally flowing out from a bottom glue outlet needle head device 1, wherein the glue is continuously used for completely removing air in the whole metering cavity 5, so that the inner cavity of the whole metering cavity 5 is filled with the glue;

after the air spitting process is finished, the controller controls the air pump to introduce air into the sealed air chamber 11 from the air inlet channel 23, the air entering the sealed air chamber 11 is used for pressing the bottom surface of the second sealing piston 12, the second sealing piston is jacked upwards, meanwhile, the spring device 13 is compressed, the top end of the bumping core 14 is contacted with the top end of the second annular groove 1602, the bumping ball 15 is forced to completely block the bottom of the second through hole 1601 of the bumping ball sealing gasket 16, and the glue in the metering cavity 5 cannot flow out of the second through hole 1601 of the bumping ball sealing gasket 16, so that the glue cannot flow out.

(2) And (3) micro-metering glue discharging:

the controller controls the air pump to stop introducing air into the sealed air chamber 11, the second sealing piston 12 moves downwards under the thrust of the spring device 13, a gap is generated between the top end of the plunger 14 and the top end of the second annular groove 1602, the plunger 15 is not in contact with the inner side wall of the bottom of the second through hole 1601 of the plunger gasket 16, glue in the metering cavity 5 flows out along the surface of the plunger 15 from the second through hole 1601 of the plunger gasket 16, and is in a glue discharging state at the moment, and the micro glue discharging of the glue in the metering cavity 5 is realized through the micro distance between the plunger 15 and the inner side wall of the bottom of the second through hole 1601 of the plunger gasket 16.

Meanwhile, the controller controls the servo motor 7, the lead screw 8 and the lead screw nut 9 to be matched, the downward moving positions of the plunger rod 10 and the plunger piston are accurately controlled, glue in the metering cavity 5 is accurately and quantitatively extruded, and the glue discharging process is accurately controlled by the micro amount of glue in the metering cavity 5.

After the plunger reaches the descending rated stroke, the micro-metering glue discharging is completed for one time, the controller controls the air pump to introduce air into the sealed air chamber 11 from the air inlet channel 23, the air entering the sealed air chamber 11 presses the bottom surface of the second sealed piston 12 to jack the second sealed piston upwards, the collision ball 15 is forced to completely block the bottom of the second through hole 1601 of the collision ball sealing pad 16, the glue outlet of the pump cavity is closed, and the second sealed piston is in a non-glue discharging state; and then the controller controls the servo motor 7, the lead screw 8 and the lead screw nut 9 to be matched, the upward movement of the plunger rod 7 and the plunger is accurately controlled, the plunger rises, negative pressure is generated in the metering cavity 5, the resin in the metering glue inlet channel 6 enters the metering cavity 5 under the action of the negative pressure to fully fill the metering cavity 5, the metering glue inlet channel stops when the plunger reaches the rising rated stroke, and next micro accurate metering glue outlet is started under the control of the controller.

The glue discharging and feeding are in reciprocating circulation, so that the accuracy and precision of each trace amount of glue metering are ensured, and each workpiece is ensured to have the same high-quality glue dispensing processing characteristic. The utility model discloses a point gum machine is with high viscosity glue trace metering valve can realize that the high accuracy trace goes out to glue, and through the smooth drainage on hitting 15 surfaces of ball, the trace that especially is fit for the high viscosity colloid goes out to glue, makes its glue solution flow along 15 surfaces smooth and easy, the volume of going out to glue is easily controlled and even, ensures that whole glue of gluing lasts effectively going on, ensures the processingquality of high viscosity colloid work piece. The utility model discloses a 5 inner structure devices in high viscosity glue micro-metering valve measurement chamber for point gum machine stand wear and tear the ability reinforce, long service life, especially hit the switching of the floating structure design control play of ball 15 department glue with not going out the gluey process, compare with the prior art device, in the use, hit ball sealed pad 16 and hit the friction between the ball 15 and can not restrict a bit, but rather than the bottom edge random contact of second through-hole 1601, show the change cycle of extension vulnerable part, save cost of maintenance, improve work efficiency simultaneously.

In addition, in the ordinary metering valve in the prior art, in the process of up-and-down movement of the valve core, the volume of the colloid in the metering cavity changes alternately to bring certain fluctuation, and the fluctuation has little influence on the metering accuracy of the glue outlet of the conventional large-flow large-volume glue inlet valve, but for the metering of the glue inlet valve in the field of micro-metering, the fluctuation can cause larger metering error and seriously influence the precision and accuracy of micro-glue outlet. Therefore, the utility model discloses a high viscosity glue micro-metering valve for point gum machine is for solving above-mentioned defect, utilize when hitting the core 14 up-and-down motion with hit the isovolumetric clearance that produces between sealed 16 of ball pad and the needle file 101 and offset the produced fluctuation of this kind of volume change each other in valve body inside to reach the inaccurate effect of reduction valve export measurement, the micro-metering that is particularly suitable for the high viscosity colloid goes out to glue, satisfies the actual demand that micro-output glued such as electronic manufacturing trade.

And a first sealing device 17 is fixedly arranged between the upper end of the middle valve body 3 and the metering cavity 5 and between the plunger rod 10 and the metering cavity 5, and the first sealing device 17 comprises a sealing adjusting wire, and a V-shaped sealing gasket and a V-shaped sealing seat which are arranged on the upper part of the metering glue inlet channel 6 and fixedly arranged on the middle valve body 3, so that the upper part sealing performance of the whole metering cavity 5 is ensured, and the accurate metering of the metering device is ensured.

And a third sealing ring device 18 matched with the striking core 14 is also arranged around the striking core 14 positioned between the striking ball sealing gasket 16 and the upper surface of the second sealing piston 12, and the third sealing ring device 18 is a flooding sealing ring, so that the sealing performance of a gap between the striking core 14 and the striking ball sealing gasket 16 at the lower part of the whole metering cavity 5 is ensured, and the accuracy of the glue output amount of the metering device is further ensured.

A fourth sealing ring device 19 is also fixedly arranged between the needle seat 101 of the bottom glue outlet needle device 1 and the inner side wall of the collision core 14, so that the tightness of the connection between the needle seat 101 of the bottom glue outlet needle device 1 and the collision core 14 is ensured.

The first sealing device 17, the third sealing device 18 and the fourth sealing device 19 protect the sealing performance of the colloid of the whole metering device from the metering cavity 5 to the needle head from all directions, and ensure the accurate micro-control of the whole glue output.

The bottom of lower valve body 4 is equipped with rather than dismantling the gas chamber lid 20 of sealing connection, is convenient for lower valve body 4 inner structure's installation and maintenance.

The bottom glue outlet needle device 1 positioned at the bottom of the lower valve body 4 is fixedly connected with the bottom of the air chamber cover through the needle pressing cover ring, so that the whole structure is firm, the glue dispensing process is accurate in positioning, and the processing quality of workpieces is ensured.

The inner side wall of the upper support 2 is also provided with a limiting slide rail 21 matched with the screw rod nut 9, the screw rod nut 9 slides on the limiting slide rail 21 in a limiting way through a slide rail nut 22, and the limiting slide rail, the screw rod nut 9 and the plunger rod 10 cooperate with the servo motor 7, the screw rod 8, the screw rod nut 9 and the plunger rod 10 to ensure that the descending distance and the ascending distance of the plunger rod 10 are accurately controlled every time, and further ensure the accuracy and the consistency of the glue discharging amount of the high-viscosity glue micro metering valve for the glue dispenser every time.

The material of the ball striking sealing gasket 16 is POM material, the material of the ball striking 15 is SSiC material, the material of the ball striking 15 is firmer and more durable, and the material of the ball striking sealing gasket is matched with the POM material of the ball striking sealing gasket 16, and meanwhile, the whole metering micro-metering accuracy is further ensured.

To sum up, the utility model discloses a high viscosity glue micro-metering valve for point gum machine, the small and exquisite compactness of device structure, it is small, can realize that the high accuracy is micro to go out to glue, especially be fit for the micro of high viscosity colloid to go out to glue, make its glue solution flow smooth and easy, go out to glue the volume and easily control and even, ensure that whole point is glued continuously going on of process, ensure the processingquality of high viscosity colloid work piece.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (10)

1. A high-viscosity glue micro-metering valve for a dispenser is characterized by comprising a controller, a valve seat body, a driving device, a transmission device and a micro-metering device, wherein a bottom glue outlet needle head device is mounted at the bottom end of the micro-metering device; the valve seat body from top to bottom includes upper bracket, well valve body and lower valve body in proper order, the micro-metering device is located the lower part of valve seat body: the middle valve body and the lower valve body;

the micro-metering device comprises a vertical metering cavity arranged in the middle valve body, a metering glue inlet channel communicated with the metering cavity is further arranged on the side wall of the middle valve body, a servo motor, a screw rod nut and a plunger rod are arranged on the upper support, the servo motor is connected with the screw rod through a coupler, the servo motor is conducted to the screw rod when rotating, and the screw rod nut moves up and down to drive the plunger rod and the plunger to move up and down simultaneously in the metering cavity.

2. The high-viscosity glue micro-metering valve for the dispenser according to claim 1, wherein the micro-metering device is pneumatically controlled and comprises a sealed air chamber arranged at the bottom of the lower valve body, a second sealing piston matched with the sealed air chamber is arranged in the sealed air chamber, a spring device is fixedly arranged at the upper part of the second sealing piston, an air inlet channel is further arranged on the side wall of the sealed air chamber and positioned at the lower part of the second sealing piston, the controller is used for controlling the on-off of air entering from the air inlet channel, and the air entering the sealed air chamber presses the bottom surface of the second sealing piston to jack the bottom surface of the second sealing piston and compresses the spring device;

a circular ring-shaped collision core is embedded in the upper surface of the second sealing piston, a vertical first through hole is formed in the middle of the collision core, a needle seat of a bottom glue outlet needle head device is embedded in the bottom of the first through hole of the collision core, a first annular groove with the inner diameter larger than that of the first through hole is further formed in the upper end of the collision core, and the inner diameter of the first annular groove is larger than that of the metering cavity; an annular ball collision sealing gasket matched with the collision core is embedded in the bottom of the middle valve body, a second through hole matched with the inner diameter of the metering cavity is formed in the middle of an upper cover of the ball collision sealing gasket, and a second annular groove with the inner diameter larger than that of the second through hole is formed in the bottom of the ball collision sealing gasket; the second annular groove is internally provided with a collision ball, the diameters of the collision ball are larger than the inner diameter of the metering cavity and the inner diameter of the first through hole of the collision core and smaller than the inner diameter of the first annular groove, after the middle valve body and the lower valve body are installed together, the upper part of the collision core is clamped in the second annular groove, and a gap is formed between the top end of the collision core and the top end of the second annular groove; the first annular groove of the collision core and the upper cover of the collision ball sealing gasket limit the collision ball between the first through hole of the first annular groove and the second through hole of the collision ball sealing gasket, and the collision ball is not in contact with the inner side wall of the bottom of the second through hole of the collision ball sealing gasket;

when the bottom of the second sealing piston moves upwards after being subjected to upward air pressure, the striking core also moves upwards together with the second sealing piston, and the top end of the striking core is contacted with the top end of the second annular groove, so that the striking ball is forced to completely block the bottom of the second through hole of the striking ball sealing gasket.

3. The high-viscosity glue micro-metering valve for the dispenser according to claim 2, wherein the outer diameter of the plunger is matched with the inner diameter of the metering cavity and is not attached to the metering cavity.

4. The high-viscosity glue micro-metering valve for the dispenser according to claim 1, wherein a first sealing device is further fixedly arranged between the upper end of the middle valve body and the plunger rod and the metering cavity, and the first sealing device comprises a sealing adjusting wire, and a V-shaped sealing gasket and a V-shaped sealing seat which are arranged on the upper portion of the metering glue inlet channel and fixedly arranged on the middle valve body.

5. The high-viscosity glue micro-metering valve for the dispenser as claimed in claim 2, wherein a third sealing ring device matched with the striking core is further arranged around the striking core between the striking ball sealing gasket and the upper surface of the second sealing piston, and the third sealing ring device is a flooding sealing ring.

6. The high-viscosity glue micro-metering valve for the dispenser according to claim 2, wherein a fourth sealing ring device is also fixedly arranged between the needle seat of the bottom glue outlet needle head device and the inner side wall of the collision core.

7. The high-viscosity glue micro-metering valve for the glue dispenser as claimed in claim 6, wherein the bottom of the lower valve body is provided with an air chamber cover detachably and hermetically connected with the lower valve body.

8. The high viscosity glue micro metering valve for the dispenser according to claim 7, wherein the bottom glue outlet needle device located at the bottom of the lower valve body is further fixedly connected with the bottom of the air chamber cover through a needle gland ring.

9. The high-viscosity glue micro-metering valve for the dispenser according to claim 2, wherein a limiting slide rail matched with the lead screw nut is further arranged on the inner side wall of the upper bracket, and the lead screw nut slides in a limiting manner on the limiting slide rail through a slide rail nut.

10. The high-viscosity glue micro-metering valve for the dispenser according to claim 2, wherein the collision ball is made of an SSiC material, and the collision ball sealing gasket is made of a POM material.

Images