A high viscosity glue micro-metering valve for glue dispensing machine

Abstract

The present invention discloses a high-viscosity glue micro-metering valve for a glue dispensing machine, which solves the technical problems in the prior art that when a glue dispensing machine uses a high-viscosity glue, there are problems such as poor glue flow, glue breakage, difficult glue output, low precision, uneven glue feed, and easy wear. The high-viscosity glue micro-metering valve for a glue dispensing machine provided by the present invention includes a controller, a valve seat body, a drive device, a transmission device, and a micro-metering device. The valve seat body includes an upper bracket, a middle valve body, and a lower valve body from top to bottom. The micro-metering device is arranged at the lower part of the valve seat body; the micro-metering device includes a vertical metering cavity arranged inside the middle valve body, and a metering glue feeding channel connected to the metering cavity is also arranged on the side wall of the middle valve body. When the servo motor arranged on the upper bracket rotates, it is transmitted to the screw rod, 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. It can be widely used in the field of metering technology of glue dispensing machines.

Description

Technical Field

[0001] The invention relates to the technical field of glue dispensing machine metering, in particular to a high-viscosity glue micro-metering valve for a glue dispensing machine. Background Art

[0002] At present, the domestic dispensing machine is composed of a controller, an air compressor and an injection needle, and has been widely used in the potting, fixing and coating processes of the electronics industry. When working, this pneumatic dispensing machine uses the compressed gas generated by the air compressor to push the piston forward. The controller adjusts the amount of glue dispensing and prevents dripping by controlling the size, duration and positive and negative direction of the compressed air. This working method first requires the configuration of an air compressor or the construction of an air compressor station, and the pipeline is more complicated.

[0003] Secondly, the compressed gas has elastic properties, and precise control is somewhat difficult. The high-frequency reciprocating motion of the piston will inevitably cause the glue to enter the piston's pressure chamber. When the pressure chamber is negative pressure, the glue will inevitably be sucked into the control solenoid valve, making the glue dispenser unable to work normally. In actual work, it is also found that many glue dispensers have problems such as poor glue flow, glue breakage, and difficult to control glue output when using high-viscosity glue.

[0004] Furthermore, the existing locking and closing of colloids uses a sliding valve, and the high-viscosity colloid fluid is repeatedly closed and throttled, which can easily cause friction damage to the valve parts. Most of the existing dispensing machines are screw-type metering glue dispensing machines, which not only have a slow dispensing speed, but also have very limited requirements for the viscosity of the material, and cannot accurately and efficiently dispense high-viscosity colloids. Especially for fields where the dispensing machine has a relatively high requirement for a small amount of glue, such as electronic components and other fields, the existing dispensing machines cannot meet their high-precision requirements. Therefore, it is a task facing technicians to develop a new dispensing machine that can adapt to high-viscosity glue. Summary of the invention

[0005] In view of the shortcomings and deficiencies in the prior art, the present invention provides a high-viscosity glue micro-metering valve for a dispensing machine that can achieve high-precision micro-dispensing of glue, is particularly suitable for micro-dispensing of high-viscosity colloids, has smooth glue flow, easy control of glue output, uniform glue input, is not easy to damage, and has a long service life.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a high-viscosity glue micro-metering valve for a dispensing machine, comprising a controller, a valve seat body, a driving device, a transmission device and a micro-metering device, a bottom end of the micro-metering device is installed with a bottom end glue discharge needle device, the valve seat body comprises an upper bracket, a middle valve body and a lower valve body from top to bottom, and the micro-metering device is arranged at the lower part of the valve seat body: on the middle valve body and the lower valve body;

[0007] The micro-metering device includes a vertical metering chamber arranged inside the middle valve body. A metering glue inlet channel connected to the metering chamber is also provided on the side wall of the middle valve body. A servo motor, a screw, a screw nut and a plunger rod are provided on the upper bracket. The servo motor is connected to the screw through a coupling. When the servo motor rotates, it is transmitted to the screw. The screw nut moves up and down, driving the plunger rod and the plunger to move up and down simultaneously in the metering chamber.

[0008] Preferably, the on-off device at the front end of the micro-metering cavity is pneumatically controlled, which includes a sealed air chamber arranged at the bottom of the lower valve body, a second sealing piston matching with the sealed air chamber is installed in the sealed air chamber, a spring device is also fixedly arranged on the upper part of the second sealing piston, and an air inlet channel is also arranged on the side wall of the sealed air chamber located at the lower part of the second sealing piston, and the on-off of the gas entering from the air inlet channel is controlled by a controller, and the gas entering the sealed air chamber presses the bottom surface of the second sealing piston to lift it up, and compresses the spring device at the same time;

[0009] The upper surface of the second sealing piston is embedded with an annular impact core, a vertical first through hole is provided in the middle of the impact core, a needle seat of a bottom end glue discharge needle device is embedded in the bottom of the first through hole of the impact core, and a first annular groove with an inner diameter larger than the first through hole is also provided in the upper end thereof, and the inner diameter of the first annular groove is larger than the inner diameter of the metering cavity; an annular billiard ball sealing pad matching the impact core is also embedded in the bottom of the middle valve body, a second through hole matching the inner diameter of the metering cavity is provided in the middle of the upper cover of the billiard ball sealing pad, and a second ring with an inner diameter larger than the inner diameter of the second through hole is provided in the bottom of the billiard ball sealing pad The second annular groove is also provided with a billiard ball, the diameter of which is larger than the inner diameter of the metering cavity and the inner diameter of the first through hole of the impact 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 impact core is clamped in the second annular groove, and a gap is provided between the top of the impact core and the top of the second annular groove; the first annular groove of the impact core and the upper cover of the billiard ball sealing pad restrict the billiard ball between the first through hole of the first annular groove and the second through hole of the billiard ball sealing pad, and the billiard ball does not contact the bottom inner side wall of the second through hole of the billiard ball sealing pad;

[0010] When the bottom of the second sealing piston is subjected to upward air pressure and moves upward, the impact core also moves upward with it, and the top of the impact core contacts the top of the second annular groove, forcing the billiard ball to completely block the bottom of the second through hole of the billiard ball sealing pad.

[0011] Preferably, the outer diameter of the plunger matches the inner diameter of the metering cavity and is not arranged in a close fit.

[0012] Preferably, a first sealing device is fixedly provided at the upper end of the middle valve body, between the plunger rod and the metering chamber, and comprises a sealing adjustment wire and a V-shaped sealing gasket and a V-shaped sealing seat located at the upper part of the metering glue inlet channel and fixedly provided on the middle valve body.

[0013] Preferably, a third sealing ring device matching with the collision core is provided around the collision core between the billiard ball sealing pad and the upper surface of the second sealing piston, and the third sealing ring device is a pan-seal ring.

[0014] Preferably, a fourth sealing ring device is also fixedly provided between the needle seat of the bottom glue discharging needle device and the inner side wall of the impact core.

[0015] Preferably, an air chamber cover is provided at the bottom of the lower valve body and is detachably sealed therewith.

[0016] Preferably, the bottom glue discharging needle device located at the bottom of the lower valve body is also fixedly connected to the bottom of the air chamber cover through a needle pressure cover ring.

[0017] Preferably, a limit slide rail matching the lead screw nut is further provided on the inner side wall of the upper bracket, and the lead screw nut slides within the limit position on the limit slide rail through a slide rail nut.

[0018] Preferably, the billiard ball is made of SSiC material, and the billiard ball sealing gasket is made of POM material.

[0019] The present invention provides a high-viscosity glue micro-metering valve for a glue dispensing machine. It has the following beneficial effects:

[0020] (1) The high-viscosity glue micro-metering valve for the glue dispensing machine of the present invention has a compact structure and a small size, and can achieve high-precision micro-dispensing of glue. It is particularly suitable for micro-dispensing of high-viscosity colloids, so that the glue liquid flows smoothly and the glue dispensing amount is easy to control and uniform, ensuring the continuity of the entire glue dispensing process and the processing quality of high-viscosity colloid workpieces.

[0021] (2) The high-viscosity glue micro-metering valve for the glue dispensing machine of the present invention has a good overall pump valve sealing effect, which protects the sealing of the colloid of the entire metering device from the metering chamber to the needle in all directions, ensuring accurate micro-control of the entire glue output.

[0022] (3) The high-viscosity glue micro-metering valve for the glue dispensing machine of the present invention has strong wear resistance and long service life, especially the structural design of the billiard ball. During use, the friction between the billiard ball sealing pad and the billiard ball is not limited to one point, but randomly contacts the bottom edge of the second through hole, which significantly extends the replacement cycle of wearing parts, saves maintenance costs, and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention;

[0024] Figure 2 It is a structural schematic diagram of the present invention (removing the front panel);

[0025] Figure 3 for Figure 1 A schematic diagram of a top view of the structure;

[0026] Figure 4 for Figure 3 Schematic diagram of the structure in the FF section view;

[0027] Figure 5 for Figure 4 A is a structural schematic diagram of a local enlarged view;

[0028] Figure 6 for Figure 5 The structural diagram of the partial enlarged view in B.

[0029] In the figure: 1. bottom glue needle device, 101. needle seat, 2. upper bracket, 3. middle valve body, 4. lower valve body, 5. metering chamber, 6. metering glue inlet channel, 7. servo motor, 8. screw, 9. screw nut, 10. plunger rod, 11. sealing air chamber, 12. second sealing piston, 13. spring device, 14. impact core, 1401 first annular groove, 1402. first through hole, 15. billiard ball, 16. billiard ball sealing pad, 1601. second through hole, 1602. second annular groove, 17. first sealing device, 18. third sealing ring device, 19. fourth sealing ring device, 20. air chamber cover, 21. limit slide rail, 22. slide rail nut, 23. air inlet channel. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] See also Figure 1-4 , the present invention provides a technical solution:

[0033] The present invention provides a high-viscosity glue micro-metering valve for a dispensing machine, comprising a controller, a valve seat body, a driving device, a transmission device and a micro-metering device, wherein a bottom end glue discharging needle device 1 is installed at the bottom end of the micro-metering device, and the valve seat body comprises an upper bracket 2, a middle valve body 3 and a lower valve body 4 from top to bottom, and the micro-metering device is arranged at the lower part of the valve seat body: on the middle valve body 3 and the lower valve body 4;

[0034] The micro-metering device includes a vertical metering chamber 5 arranged inside the middle valve body 3. The side wall of the middle valve body 3 is also provided with a metering chamber glue inlet channel 6 connected to the metering chamber 5. The upper bracket 2 is provided with a servo motor 7, a screw 8, a screw nut 9 and a plunger rod 10. The servo motor 7 is connected to the screw 8 through a coupling. When the servo motor 7 rotates, it is transmitted to the screw 8. The screw nut 9 moves up and down, driving the plunger rod 10 and the plunger to move up and down at the same time in the metering chamber 5.

[0035] The micro-metering device is pneumatically controlled, and includes a sealed air chamber 11 arranged at the bottom of the lower valve body 4, in which a second sealed piston 12 matching the sealed air chamber 11 is installed, and a spring device 13 distributed circumferentially is fixed to the upper part of the second sealed piston 12, and an air intake channel 23 is also provided on the side wall of the sealed air chamber 11 located at the lower part of the second sealed piston 12. The pressure of the gas entering from the air intake channel 23 is controlled by a controller, and the gas entering the sealed air chamber 11 exerts pressure on the bottom surface of the second sealed piston 12 to push it upward, and at the same time compresses the spring device 13 to make it in a non-glue discharging state.

[0036] An annular impact core 14 is embedded in the upper surface of the second sealing piston 12, and a vertical first through hole 1402 is provided in the middle of the impact core 14. A needle seat 101 of the bottom end glue discharge needle device 1 is embedded in the bottom of the first through hole 1402 of the impact core 14, and a first annular groove 1401 with an inner diameter larger than the first through hole 1402 is also provided at the upper end thereof, and the inner diameter of the first annular groove 1401 is larger than the inner diameter of the metering chamber 5; an annular billiard ball sealing gasket 16 matching the impact core 14 is also embedded in the bottom of the middle valve body 3, and a second through hole 1601 matching the inner diameter of the metering chamber 5 is provided in the middle of the upper cover of the billiard ball sealing gasket 16, and a second annular groove 1602 with an inner diameter larger than the inner diameter of the second through hole 1601 is provided at the bottom of the billiard ball sealing gasket 16; A billiard ball 15 is also provided in the annular groove 1602, the diameter of which is larger than the inner diameter of the metering cavity 5 and the inner diameter of the first through hole 1402 of the impact 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 impact core 14 is clamped in the second annular groove 1602, and a gap is provided between the top of the impact core 14 and the top of the second annular groove 1602; the first annular groove 1401 of the impact core 14 and the upper cover of the billiard ball sealing pad 16 restrict the billiard ball 15 between the first through hole 1402 of the first annular groove 1401 and the second through hole 1601 of the billiard ball sealing pad 16, and the billiard ball 15 does not contact the bottom inner wall of the second through hole 1601 of the billiard ball sealing pad, and is in a glue discharging state at this time.

[0037] When the bottom of the second sealing piston 12 is subjected to upward air pressure and moves upward, the impact core 14 also moves upward with it, and the top of the impact core 14 contacts the top of the second annular groove 1602, forcing the billiard ball 15 to completely block the bottom of the second through hole 1601 of the billiard ball sealing pad 16, so that it is in a non-glue-discharging state.

[0038] The outer diameter of the plunger matches the inner diameter of the metering cavity 5 and is not fitted. When the plunger enters the metering cavity 5, the gap between the outer wall of the plunger and the inner wall of the metering cavity 5 can effectively prevent the wear of the plunger, extend the service life, and ensure the continuous and effective metering of the entire metering device.

[0039] The specific usage process is as follows:

[0040] (1) Empty dispensing process: The controller controls the cooperation of the servo motor 7, the screw 8 and the screw nut 9 to accurately control the up and down movement distance of the plunger rod 10 and the plunger. After the plunger is lifted to the set position before the glue is fed, the billiard ball 15 and the bottom inner wall of the second through hole 1601 of the billiard ball sealing pad 16 are not in contact with each other, and the glue is discharged at this time. Then, the measured volume of glue is pumped into the metering chamber 5 through the metering glue feeding channel 6, and finally flows out from the glue discharge needle device 1 at the bottom. After a period of time, the glue completely removes the air in the entire metering chamber 5, so that the entire internal chamber of the metering chamber 5 is filled with glue.

[0041] After the air exhalation process is completed, the controller controls the air pump to introduce gas into the sealed air chamber 11 from the air inlet channel 23. The gas entering the sealed air chamber 11 exerts pressure on the bottom surface of the second sealing piston 12, pushing it upward, and compressing the spring device 13 at the same time. The top of the impact core 14 contacts the top of the second annular groove 1602, forcing the billiard ball 15 to completely block the bottom of the second through hole 1601 of the billiard ball sealing pad 16, and the glue inside the metering chamber 5 cannot flow out from the second through hole 1601 of the billiard ball sealing pad 16, so that it is in a non-glue-discharging state.

[0042] (2) Micro-metering glue dispensing process:

[0043] The controller controls the air pump to stop supplying gas into the sealed air chamber 11. The second sealing piston 12 moves downward under the thrust of the spring device 13. A gap is generated between the top of the impact core 14 and the top of the second annular groove 1602. The billiard ball 15 and the bottom inner wall of the second through hole 1601 of the billiard ball sealing pad 16 are not in contact. The glue inside the metering chamber 5 flows out from the second through hole 1601 of the billiard ball sealing pad 16 along the surface of the billiard ball 15. At this time, it is in a glue discharging state, and through the small distance between the billiard ball 15 and the bottom inner wall of the second through hole 1601 of the billiard ball sealing pad 16, a small amount of glue discharge from the metering chamber 5 is achieved.

[0044] At the same time, the controller controls the cooperation between the servo motor 7, the screw 8 and the screw nut 9, accurately controls the downward movement position of the plunger rod 10 and the plunger, and accurately and quantitatively squeezes out the glue in the metering chamber 5, thereby realizing the precise control of the glue discharge process of the glue inside the metering chamber 5.

[0045] When the plunger reaches the rated downward stroke, a micro-metered glue dispensing is completed, and the controller controls the air pump to introduce gas from the air inlet channel 23 into the sealed air chamber 11. The gas entering the sealed air chamber 11 exerts pressure on the bottom surface of the second sealing piston 12, pushing it upward, forcing the billiard ball 15 to completely block the bottom of the second through hole 1601 of the billiard ball sealing pad 16, so that the glue outlet of the pump cavity is closed, so that it is in a non-glue dispensing state; then the controller controls the cooperation of the servo motor 7, the screw rod 8 and the screw nut 9 to accurately control the upward movement of the plunger rod 7 and the plunger, the plunger rises, and negative pressure is generated in the metering chamber 5. The resin in the metering glue feeding channel 6 enters the metering chamber 5 under the action of negative pressure to fill it up. When the plunger reaches the rated upward stroke, it stops, and then the next micro-precision metered glue dispensing starts under the control of the controller.

[0046] The reciprocating cycle of discharging and feeding glue ensures the accuracy and precision of each micro-metering of glue, so that each workpiece has the same high-quality glue dispensing processing characteristics. The high-viscosity glue micro-metering valve for the glue dispensing machine of the present invention can realize high-precision micro-dispensing of glue. Through the smooth drainage on the surface of the billiard ball 15, it is particularly suitable for micro-dispensing of high-viscosity colloids, so that the glue flows smoothly along the surface of 15, the amount of glue dispensing is easy to control and uniform, ensuring the continuous and effective implementation of the entire dispensing process and ensuring the processing quality of high-viscosity colloid workpieces. The internal structure device of the metering cavity 5 of the high-viscosity glue micro-metering valve for the glue dispensing machine of the present invention has strong wear resistance and long service life, especially the floating structure design at the billiard ball 15 controls the switching of the dispensing and non-dispensing processes. Compared with the prior art device, during use, the friction between the billiard ball sealing pad 16 and the billiard ball 15 will not be limited to one point, but will randomly contact the bottom edge of its second through hole 1601, significantly extending the replacement cycle of vulnerable parts, saving maintenance costs, and improving work efficiency.

[0047] In addition, in the common metering valve in the prior art, the alternating change of the volume of the colloid in the metering chamber during the up and down movement of the valve core will bring certain fluctuations. For the metering of conventional large-flow and large-volume glue inlet valves, such fluctuations have little effect on the metering accuracy of the glue output at its glue outlet. However, for the metering of glue inlet valves in the field of micro-metering, such fluctuations will cause large metering errors, seriously affecting the precision and accuracy of micro-discharge of glue. Therefore, in order to solve the above-mentioned defects, the micro-metering valve for high-viscosity glue for glue dispensing machine of the present invention utilizes the equal-volume gap generated between the collision core 14 and the billiard ball sealing pad 16 and the needle seat 101 when the collision core 14 moves up and down to offset the fluctuations caused by such volume changes inside the valve body, so as to achieve the effect of reducing the inaccurate metering of the valve outlet, which is particularly suitable for micro-metering of high-viscosity colloids and meets the actual needs of micro-discharge of glue in the electronic manufacturing industry.

[0048] A first sealing body device 17 is also fixedly provided at the upper end of the middle valve body 3, between the plunger rod 10 and the metering chamber 5. The first sealing device 17 includes a sealing adjustment wire and a V-shaped sealing gasket and a V-shaped sealing seat fixedly provided on the middle valve body 3 and located at the upper part of the metering glue inlet channel 6, thereby ensuring the sealing of the entire upper part of the metering chamber 5 and ensuring the accurate metering of the metering device.

[0049] A third sealing ring device 18 matching with the impact core 14 located between the billiard ball sealing pad 16 and the upper surface of the second sealing piston 12 is also provided around the impact core 14. The third sealing ring device 18 is a pan-sealing ring to ensure the sealing of the gap between the impact core 14 and the billiard ball sealing pad 16 in the lower part of the entire metering chamber 5, and further ensure the accuracy of the glue output of the metering device.

[0050] A fourth sealing ring device 19 is also fixedly provided between the needle seat 101 of the bottom glue dispensing needle device 1 and the inner side wall of the impact core 14 to ensure the sealing of the connection between the needle seat 101 of the bottom glue dispensing needle device 1 and the impact core 14 .

[0051] The first sealing device 17, the third sealing ring device 18, and the fourth sealing ring device 19 protect the sealing of the colloid of the entire metering device from the metering chamber 5 to the needle in all directions, ensuring the precise micro-control of the entire output amount of the glue.

[0052] An air chamber cover 20 is provided at the bottom of the lower valve body 4 and is detachably and hermetically connected thereto, so as to facilitate installation and maintenance of the internal structure of the lower valve body 4 .

[0053] The bottom glue discharging needle device 1 located at the bottom of the lower valve body 4 is also fixedly connected to the bottom of the air chamber cover through a needle pressure ring, ensuring the firmness of the overall structure, accurate positioning of the dispensing process, and ensuring the quality of workpiece processing.

[0054] A limiting slide rail 21 matching the lead screw nut 9 is also provided on the inner side wall of the upper bracket 2. The lead screw nut 9 slides on the limiting slide rail 21 through the slide rail nut 22, and cooperates with the servo motor 7, lead screw 8, lead screw nut 9 and plunger rod 10 to ensure that the descending and ascending distances of the plunger rod 10 are accurately controlled each time, further ensuring the accuracy and consistency of the glue output of each time of the high-viscosity glue micro-metering valve for the dispensing machine.

[0055] The billiard ball sealing gasket 16 is made of POM material, and the billiard ball 15 is made of SSiC material. This material of the billiard ball 15 is more durable and matches the POM material of the billiard ball sealing gasket 16, while further ensuring the accuracy of the entire metering and micro-metering.

[0056] In summary, the high-viscosity glue micro-metering valve for the dispensing machine of the present invention has a compact structure and a small size, and can achieve high-precision micro-dispensing of glue. It is especially suitable for micro-dispensing of high-viscosity colloids, so that the glue liquid flows smoothly and the glue discharge amount is easy to control and uniform, ensuring the continuation of the entire dispensing process and ensuring the processing quality of high-viscosity colloid workpieces.

[0057] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high viscosity glue micro-metering valve for a dispensing machine, characterized in that: It includes a controller, a valve seat body, a driving device, a transmission device and a micro-metering device, wherein a bottom end glue discharging needle device is installed at the bottom of the micro-metering device; the valve seat body includes an upper bracket, a middle valve body and a lower valve body from top to bottom, and the micro-metering device is arranged at the lower part of the valve seat body: on the middle valve body and the lower valve body; The micro-metering device comprises a vertical metering cavity arranged inside the middle valve body, a metering glue feeding channel connected to the metering cavity is also arranged on the side wall of the middle valve body, a servo motor, a screw, a screw nut and a plunger rod are arranged on the upper bracket, the servo motor is connected to the screw through a coupling, when the servo motor rotates, it is transmitted to the screw, and the screw nut moves up and down to drive the plunger rod and the plunger to move up and down in the metering cavity at the same time; The micro-metering device is pneumatically controlled, and includes a sealed air chamber arranged at the bottom of the lower valve body, a second sealed piston matching the sealed air chamber is installed in the sealed air chamber, a spring device is fixedly arranged on the upper part of the second sealed piston, and an air inlet channel is arranged on the side wall of the sealed air chamber located at the lower part of the second sealed piston, and the controller controls the on-off of the gas entering from the air inlet channel, and the gas entering the sealed air chamber presses the bottom surface of the second sealed piston to lift it up, and compresses the spring device at the same time; An annular impact core is embedded in the upper surface of the second sealing piston, a vertical first through hole is provided in the middle of the impact core, a needle seat of a bottom end glue discharge needle device is embedded in the bottom of the first through hole of the impact core, and a first annular groove with an inner diameter larger than the first through hole is also provided in the upper end thereof, and the inner diameter of the first annular groove is larger than the inner diameter of the metering cavity; an annular billiard ball sealing pad matching the impact core is also embedded in the bottom of the middle valve body, a second through hole matching the inner diameter of the metering cavity is provided in the middle of the upper cover of the billiard ball sealing pad, and a second annular groove with an inner diameter larger than the inner diameter of the second through hole is provided in the bottom of the billiard ball sealing pad; A billiard ball with a diameter greater than the inner diameter of the metering cavity and the inner diameter of the first through hole of the impact core, and smaller than the inner diameter of the first annular groove, is also provided in the second annular groove. After the middle valve body and the lower valve body are installed together, the upper part of the impact core is clamped in the second annular groove, and a gap is provided between the top of the impact core and the top of the second annular groove; the first annular groove of the impact core and the upper cover of the billiard ball sealing pad restrict the billiard ball between the first through hole of the first annular groove and the second through hole of the billiard ball sealing pad, and the billiard ball does not contact the bottom inner side wall of the second through hole of the billiard ball sealing pad; When the bottom of the second sealing piston is subjected to upward air pressure and moves upward, the striker also moves upward with it, and the top of the striker contacts the top of the second annular groove, forcing the billiard ball to completely block the bottom of the second through hole of the billiard ball sealing pad; The outer diameter of the plunger matches the inner diameter of the metering cavity and is not arranged in a close fit.

2. The high-viscosity glue micro-metering valve for a dispensing machine according to claim 1 is characterized in that: A first sealing device is also fixedly arranged at the upper end of the middle valve body, between the plunger rod and the metering chamber. The first sealing device includes a sealing adjustment wire and a V-shaped sealing gasket and a V-shaped sealing seat located at the upper part of the metering glue inlet channel and fixedly arranged on the middle valve body.

3. The high-viscosity glue micro-metering valve for a glue dispensing machine according to claim 1 is characterized in that: A third sealing ring device matching with the collision core is also provided around the collision core between the billiard ball sealing pad and the upper surface of the second sealing piston, and the third sealing ring device is a pan sealing ring.

4. The high-viscosity glue micro-metering valve for a glue dispensing machine according to claim 1 is characterized in that: A fourth sealing ring device is also fixedly arranged between the needle seat of the bottom glue discharge needle device and the inner side wall of the impact core.

5. The high-viscosity glue micro-metering valve for a glue dispensing machine according to claim 4, characterized in that: The bottom of the lower valve body is provided with an air chamber cover which is detachably sealed and connected thereto.

6. The high-viscosity glue micro-metering valve for a glue dispensing machine according to claim 5, characterized in that: The bottom glue discharging needle device located at the bottom of the lower valve body is also fixedly connected to the bottom of the air chamber cover through a needle pressure cover ring.

7. The high-viscosity glue micro-metering valve for a glue dispenser according to claim 1, characterized in that: A limit slide rail matching the screw nut is also provided on the inner side wall of the upper bracket, and the screw nut slides on the limit slide rail through a slide rail nut.

8. The high-viscosity glue micro-metering valve for a glue dispensing machine according to claim 1, characterized in that: The billiard ball is made of SSiC material, and the billiard ball sealing gasket is made of POM material.

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