Dispensing device for high-precision variable control

Abstract

The invention belongs to the technical field of chip dispensing, and particularly relates to a high-precision variable control dispensing device which comprises a platen, a negative pressure unit is arranged at one end of the platen, a regulation and control unit is arranged on one side of the negative pressure unit, and a main body unit is arranged in the external space of the negative pressure unit; by continuously changing the rotating speed of the tail disc, the vertical rod controls the rubber plate to drive the rubber shovel to continuously reciprocate in the radial direction of the empty wrapping cylinder under the extrusion action of the tail disc, and the movement is nonlinear, so that the instantaneous pressure change among the rubber needle, the rubber head and the empty wrapping cylinder is changed, nonlinear pressure pulses are formed in the comparison area of the rubber needle and the empty wrapping cylinder, and the rubber head is driven to rotate. The generated high pressure peak value can destroy a water molecular chain, an intermolecular hydrogen bond and Van der Waals force, reduce the viscosity, hardness and cohesion strength of glue, improve the shedding property of the glue from the inner wall of a glue needle, guarantee the cleanliness of the inner wall of the glue needle, and further improve the control precision of front and back dispensing variables of the dispensing machine.

Description

Technical Field

[0001] The present invention belongs to the technical field of chip dispensing, and particularly relates to a dispensing device for high-precision variable control. Background Art

[0002] Fully automatic dispensing machine: a highly automated dispensing instrument, composed of a robot motion system, a dispensing controller, a vision recognition system, etc.; that is, through a control system (such as: PLC or single-chip microcomputer, etc.) to precisely control the movement of each motion axis (such as: X, Y, Z axes), realizing the precise positioning of the dispensing head in three-dimensional space; at the same time, using a metering pump, a screw pump or a pneumatic device, etc. to extract the glue from the glue bucket and accurately distribute it to the designated area according to the set parameters, having the advantages of high dispensing accuracy and high efficiency, and being suitable for large-scale and high-precision chip dispensing production;

[0003] The existing technology for the cleaning process of the dispensing head of a fully automatic dispensing machine: turn off the equipment, do a good job in safety protection, disassemble the dispensing head, disconnect the connection between the dispensing head and the glue gun, then soak the dispensing head, and finally conduct a precise rinse of the dispensing head with a professional brush and cleaning solvent;

[0004] Due to the narrow internal space of the dispensing head (the inner diameter of the dispensing head is usually in millimeters), ordinary tools such as brushes or cotton swabs cannot penetrate deep into the inner part of the dispensing head for a comprehensive cleaning, and there is an interaction error tolerance between the inner wall of the dispensing head and the aforementioned cleaning tools, resulting in the difficulty of completely removing the glue residues;

[0005] At the same time, there is a problem of poor fluid circulation of the cleaning solvent inside the dispensing head, that is, when the dispensing head is soaked in the cleaning solvent, the solvent is difficult to quickly and evenly penetrate into all areas of the inner wall of the dispensing head, and the glue residues cannot fully contact with the solvent, affecting the dissolution effect; and when rinsing the dispensing head, the narrow channels hinder the flow of the solvent, and the rinsing is not thorough, resulting in some glue residues remaining on the inner wall of the dispensing head;

[0006] Capillary action exists on the inner wall of the dispensing head with a millimeter-level size, resulting in an increase in the adhesion force between the glue and the inner wall of the dispensing head, making it more difficult to separate the glue residues from the inner wall during cleaning; and the capillary action causes the glue to form small liquid columns or droplets inside the dispensing head, hiding in tiny gaps, further increasing the cleaning difficulty;

[0007] In addition, high-viscosity glue has large cohesive force and adhesion force. When the glue contacts the inner wall of the dispensing head, it will closely adhere to the inner wall of the dispensing head. For example, some glues such as silicone and epoxy resin have high viscosity and are prone to form a thick glue film on the inner wall of the dispensing head during the dispensing process. The binding force between the aforementioned glue film and the inner wall of the dispensing head is strong, increasing the cleaning difficulty;

[0008] The presence of glue residue on the inner wall of the glue head will lead to unstable glue output, reduce the glue output speed, cause irregular glue drop shape, and affect the consistency and uniformity of glue mixing before and after dispensing. Summary of the invention

[0009] In order to solve the above problems, the present invention adopts the following technical solution: a high-precision variable control dispensing device, comprising a platform, a negative pressure unit is arranged at one end of the platform, a regulating unit is arranged at one side of the negative pressure unit, and a main unit is arranged in the outer space of the negative pressure unit;

[0010] The negative pressure unit comprises:

[0011] Empty package tube, snap-fitted and installed at one end of the table;

[0012] The end cover is rotatably mounted on the end of the empty barrel away from the table;

[0013] The ring rail is clamped and installed on the outer wall of the empty package tube at one end away from the table plate; in addition, a ring groove is provided on the end surface of the ring rail at one side away from the table plate;

[0014] There is at least one ear seat, which is snap-fitted to the outer wall of the end cover;

[0015] The shaft seat is plug-in installed in the middle position of the ear seat, and the shaft seat is installed by sliding and clamping with the ring groove;

[0016] Arc grooves are evenly opened on the surface of the end cover;

[0017] The shaft disc is arranged on the side of the end cover close to the table plate, and the shaft disc is installed by snap-fitting with the hollow barrel; in addition, a key groove corresponding to the arc groove is opened on the surface of the shaft disc.

[0018] Preferably, a column is slidably mounted inside the key slot and is slidably mounted in cooperation with the arc slot, and a panel is slidably mounted on the column at one end away from the end cover, and a bridging plate is slidably mounted on the panel near the axis of the empty cylinder, and a sealing plate is slidably mounted on the end of the bridging plate away from the column, and an end face of the sealing plate near the end cover is in contact with an end face of the coaxial disk away from the end cover, and the cross-sectional shape of the sealing plate is a quarter-circle ring, and a rubber strip is slidably mounted on the side wall of the vertical section of the sealing plate, and a tail disk is rotatably mounted on the middle position of the inner wall of the empty cylinder, and an arc slot is also provided on the surface of the tail disk, and a section is provided on the inner wall of the empty cylinder near the end cover, and a node disk is provided on the surface of the node disk, and the section slot has the same section shape as the key slot, and a vertical rod is slidably mounted on the inner wall of the section slot and is slidably mounted on the sliding node of the tail disk, and an angle plate is slidably mounted on the end of the vertical rod near the tail disk, and the thickness of the angle plate is equal to the vertical distance between the tail disk and the section disk.

[0019] Preferably, the angle plate is clamped with a glue spatula near the axial end of the empty tube, and the glue spatula is a quarter circle, and one end of the glue spatula near the axial end of the empty tube is chamfered, and a sealing strip is clamped with the outer wall of the vertical section of the glue spatula.

[0020] Preferably, the outer wall of the empty barrel is evenly and circumferentially plugged with nozzles, and the nozzles are located between the shaft disk and the section disk, a filter plate is clamped and installed on the inner wall of the nozzle close to the axis of the empty barrel, and an annular tube is provided at the end of the nozzle away from the filter plate, and the number is one, an interface valve connected to the nozzle is clamped and installed on the inner wall of the annular tube, and the number and position of the interface valves correspond one-to-one with the nozzle, and an angle valve is clamped and installed on the outer wall of the annular tube, and the number of the angle valve is one.

[0021] Preferably, a cleaning chamber is installed at the inner axis of the empty cylinder, a cleaning roller is installed on the inner wall of the bottom side of the cleaning chamber in a circumferential manner, and the interior of the cleaning roller is a hollow structure, a brush is installed on the outer wall of the cleaning roller in a circumferential manner, atomizing nozzles are evenly distributed on the outer wall of the cleaning roller, and the atomizing nozzles and the brushes are alternately distributed, a glue port is provided between the cleaning chamber and the table to drain out the colloidal waste liquid, a drainage tube connected to the cleaning chamber is installed on the end of the table away from the end cover, an air valve is installed on the outer wall of the empty cylinder, and the air valve is located between the table and the tail plate, and a miniature vacuum pump matching the air valve is installed on the end of the table away from the end cover.

[0022] Preferably, the control unit comprises:

[0023] The vertical rod is installed in the middle of the end of the table away from the empty tube;

[0024] The side panels are symmetrically clamped and installed on the outer wall of the vertical rod;

[0025] The DC motor is mounted on the end of the vertical rod away from the table through a mounting seat, and the output end of the DC motor is mounted in cooperation with the vertical rod;

[0026] The number of the bracket is one and the bracket is mounted on the outer walls of the two side panels;

[0027] A side plate is slidably mounted on one end of the bracket;

[0028] Straight seat, snap-fitted and installed on the side wall of the side plate;

[0029] The slider is installed at the end of the straight seat away from the tabletop by sliding card connection;

[0030] The grid plate is clamped and installed between the horizontal sections at one end of the bracket;

[0031] The air pump is mounted on the end surface of the bracket away from the grid plate.

[0032] Preferably, an angle steel plate is detachably installed at the middle position of the outer wall of the grid plate through bolts. One end of the angle steel plate near the middle position of the bracket is rotatably installed with a gear through a rotating shaft. A tooling seat is slidably clamped and installed on the vertical section of the straight port seat. Rack teeth meshing with the gear are clamped and installed between the tooling seat and the opposite surface of the grid plate. Sealing rings are symmetrically clamped and installed on the end face of the tooling seat away from the straight port seat. A glue gun is clamped and installed between the two sealing rings. A glue head is clamped and installed at one end of the glue gun close to the platen, and a glue needle is clamped and installed at one end of the glue head close to the platen.

[0033] Preferably, a compensation plate is inserted and installed at one end of the glue head away from the glue gun. A convex ring is rotatably fitted on the end face of the glue head close to the glue needle. A copper tube is clamped and installed on the outer side of the end face of the convex ring close to the glue needle, and the cross-sectional shape of the copper tube is Z-shaped. An electric heating sleeve is clamped and installed on the outer wall of the copper tube close to the glue head.

[0034] Preferably, the main body unit includes:

[0035] A dispensing machine cabinet, arranged in the external space of the platen;

[0036] A base, clamped and installed at the four corners inside the dispensing machine cabinet;

[0037] Steel beams, symmetrically arranged inside the dispensing machine cabinet, and the steel beams are clamped and fitted with the base;

[0038] A pneumatic slide rail, slidably clamped and installed at the middle position of the end face of the steel beam away from the base;

[0039] A cross rail, clamped and installed at one end of the pneumatic slide rail away from the base, and the number is one; in addition, the slider is slidably clamped and fitted with the cross rail

[0040] An observation window, rotatably fitted on the adjacent end face of the dispensing machine cabinet.

[0041] A method for cleaning the glue head in a full-automatic dispensing machine, which is cleaned by using the above-mentioned dispensing device for high-precision variable control. The specific steps are as follows:

[0042] S1: First, drive the rack teeth on its surface on the tooling seat to move towards the direction close to the cross rail. During this process, through the meshing effect between the gear and the rack teeth, the grid plate is promoted to synchronously control the bracket. Under the guiding and supporting effect of the side plate, the whole negative pressure unit is driven to move away from the cross rail until the negative pressure unit is located at the gravity-facing end of the glue needle. After that, drive the vertical rod through the DC motor to drive the platen to rotate by a specified angle until the empty cartridge is distributed directly opposite to the glue needle;

[0043] S2: Then, the glue needle is controlled again by the tooling base to move away from the cross rail until the glue needle enters the empty cartridge. At this time, with the end cap in a rotating state, the column is forced, under the dual limiting effects of the keyway and the arc groove, to make the panel control the bridging plate to drive the sealing plate to move towards the axial end of the empty cartridge until the sealing plate contacts the outer wall of the glue needle. At the same time, under the control of the tail plate, the vertical rod synchronously drives the angle plate to move towards the axial end of the empty cartridge until the glue shovels contact each other.

[0044] S3: Finally, hot gas is filled into the glue needle and the glue head through an air pump. At the same time, all the gas existing inside the empty cartridge is evacuated through a micro vacuum pump. After that, the tail plate is controlled to drive the vertical rod, causing it to continuously drive the glue shovels to reciprocate. Specifically, during implementation, the rotational speed of the tail plate can be controlled to achieve non-linear control of the movement of the glue shovels, thereby realizing non-linear pulse fluctuations between the glue needle, the glue head, and the empty cartridge. And through the aforementioned non-linear pulse fluctuations, negative pressure flushing is performed on the glue residues existing on the inner wall of the glue needle, which helps to improve the cleanliness of the inner wall of the glue needle.

[0045] The present invention has the following beneficial effects:

[0046] 1. Through the column control panel of the present invention, the bridging plate is synchronously driven to drive the sealing plate to move towards the axial end of the empty cartridge, blocking the external circulation channel of the glue needle. At the same time, external hot air is introduced into the glue head through an air pump, and all the gas inside the empty cartridge is completely evacuated through a micro vacuum pump. After that, the rotational speed of the tail plate is continuously changed, so that under the squeezing action of the tail plate, the vertical rod controls the glue plate to drive the glue shovels to continuously reciprocate along the radial direction of the empty cartridge, and the aforementioned movement is non-linear, thereby changing the instantaneous pressure change between the glue needle, the glue head, and the empty cartridge, forming a non-linear pressure pulse in the comparison area between the glue needle and the empty cartridge. The generated high pressure peak can break the water molecular chain, intermolecular hydrogen bond, and van der Waals force, reduce the viscosity, hardness, and cohesive strength of the glue, improve the detachment of the glue from the inner wall of the glue needle, ensure the cleanliness of the inner wall of the glue needle, and further improve the control accuracy of the dispensing variable before and after the dispenser.

[0047] 2. Through the angle valve of the present invention, the glue solvent stored externally is distributed through the annular pipe and then flows through the interface valve into the nozzle inside the corresponding area. Finally, the atomized glue solvent is cut and decomposed again through the filter plate, so that the glue solvent is dispersed inside the empty cartridge. Finally, by changing the pressure difference between the empty cartridge and the glue needle, the atomized glue solvent continuously emerges inside the glue needle and the glue head under the negative pressure during the reciprocating movement of the glue needle, improving the mixing uniformity and sufficiency between the glue residue and the glue solvent, and further ensuring the separation between the glue residue inside the glue needle and the glue head and the inner wall of the glue needle or the glue head under the action of the aforementioned non-linear pulse pressure.

[0048] 3. The present invention realizes the cavitation effect and triggers the micro-explosion shock through non-linear instantaneous pressure pulses. That is, when the pressure rapidly decreases, gas or vapor in the liquid forms tiny bubbles. When the pressure rapidly increases again, the aforementioned cavitation bubbles will quickly collapse. The collapse of the cavitation bubbles produces a strong micro-explosion effect, releasing huge energy and generating high-speed jets and shock waves. The aforementioned micro-explosion shock acts on the glue residue, generating local high stress on its surface, resulting in phenomena such as cracks and spalling of the glue residue, thereby destroying its integrity and physical properties.

[0049] In addition, due to the rapid change of pressure, adiabatic compression and expansion phenomena will occur, thereby triggering a thermal effect. On the one hand, the adiabatic compression when the pressure increases raises the temperature of the glue, triggering thermal degradation of the glue and destroying its molecular structure and physical properties. On the other hand, the rapid change in temperature causes thermal stress in the glue residue. The combined action of the thermal stress and the mechanical stress generated by the pressure pulse further exacerbates the damage of the glue residue, causing obvious changes in its physical properties such as viscosity and hardness. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0051] Figure 2 It is an attached Figure 1 structural display diagram of the present invention after removing the dispensing cabinet.

[0052] Figure 3 It is a three-dimensional display diagram of the overall structure of the regulation unit and the negative pressure unit of the present invention.

[0053] Figure 4 It is an attached Figure 3 enlarged schematic diagram of the local structure at point A in the present invention.

[0054] Figure 5 It is an attached Figure 3 structural display diagram of another perspective in the present invention.

[0055] Figure 6 It is an attached Figure 3 front view of the structure in the present invention.

[0056] Figure 7 It is a three-dimensional structural display diagram of the negative pressure unit of the present invention.

[0057] Figure 8 It is an attached Figure 7 right view of the structure in the present invention.

[0058] Figure 9 It is an attached Figure 7 structural cross-section display diagram in the present invention.

[0059] Figure 10 It is an attached Figure 9Three-dimensional display of the local structure.

[0060] Figure 11 It is a diagram showing the local structure of the negative pressure unit in the present invention.

[0061] Figure 12 It is a three-dimensional display diagram of the rubber spatula and the local structure thereon in the present invention.

[0062] Figure 13 It is a diagram showing the interior of the cleaning room of the present invention and its internal structure.

[0063] Numbers in the figure: 1, table; 2, negative pressure unit; 3, control unit; 4, main unit;

[0064] 21. Empty barrel; 22. End cover; 23. Ring rail; 24. Ring groove; 25. Ear seat; 26. Shaft seat; 27. Arc groove; 28. Shaft disc; 29. Keyway;

[0065] 211, column; 212, panel; 213, bridge plate; 214, cover plate; 215, rubber strip; 216, tail plate; 217, section plate; 218, vertical rod; 219, angle plate;

[0066] 221, plastic spatula; 222, sealing strip;

[0067] 231, nozzle; 232, filter plate; 233, ring pipe; 234, interface valve; 235, angle valve;

[0068] 241. Cleaning chamber; 242. Cleaning roller; 243. Brush; 244. Atomizing nozzle; 245. Glue port; 246. Drainage tube; 247. Air valve; 248. Mini vacuum pump;

[0069] 31. Vertical rod; 32. Side joint plate; 33. DC motor; 34. Bracket; 35. Side plate; 36. Straight seat; 37. Slider; 38. Grid plate; 39. Air pump;

[0070] 311, angle steel plate; 312, gear; 313, tooling seat; 314, rack; 315, packaging ring; 316, glue gun; 317, glue head; 318, glue needle;

[0071] 321, compensation plate; 322, convex ring; 323, copper tube; 324, electric heating sleeve;

[0072] 41. Glue dispensing cabinet; 42. Base; 43. Steel beam; 44. Pneumatic slide rail; 45. Cross rail; 46. Observation window. DETAILED DESCRIPTION

[0073] To make the objectives, technical solutions and advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0074] It should be noted that the terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation.

[0075] The specific implementation of the present invention will be described in detail below in conjunction with specific embodiments.

[0076] Referring to Figure 1 、 Figure 2 and Figure 3 it can be seen that a dispensing device for high-precision variable control includes a platen 1, a negative pressure unit 2 is provided at one end of the platen 1, a regulation unit 3 is provided on one side of the negative pressure unit 2, and a main body unit 4 is provided in the external space of the negative pressure unit 2;

[0077] Referring to Figure 3 、 Figure 5 and Figure 6 it can be seen that the said regulation unit 3 includes: a vertical rod 31, inserted and installed at the middle position of the end of the platen 1 far from the empty cartridge 21; side closing plates 32, symmetrically clamped and installed on the outer wall of the vertical rod 31; a DC motor 33, clamped and installed on the end of the vertical rod 31 far from the platen 1 through a mounting seat, and the output end of the DC motor 33 is clamped and installed in cooperation with the vertical rod 31; a bracket 34, with a quantity of one, and clamped and installed on the outer walls of the two side closing plates 32; a side plate 35, slidably clamped and installed at one end of the bracket 34; a straight port seat 36, clamped and installed on the side wall of the side plate 35; a slider 37, slidably clamped and installed at the end of the straight port seat 36 far from the platen 1; a grid plate 38, clamped and installed between the horizontal sections at one end of the bracket 34; an air pump 39, clamped and installed on the end face of the bracket 34 far from the grid plate 38;

[0078] Referring to Figure 2 、 Figure 3 and Figure 4 it can be seen that an angle steel plate 311 is detachably installed at the middle position of the outer wall of the grid plate 38 through bolts, a gear 312 is rotatably installed at one end of the angle steel plate 311 close to the middle position of the bracket 34 through a rotating shaft, a tooling seat 313 is slidably clamped and installed on the vertical section of the straight port seat 36, and racks 314 meshing with the gear 312 are clamped and installed between the opposite faces of the tooling seat 313 and the grid plate 38. Sealing rings 315 are symmetrically clamped and installed on the end face of the tooling seat 313 far from the straight port seat 36, a glue gun 316 is clamped and installed between the two sealing rings 315, a glue head 317 is clamped and installed at the end of the glue gun 316 close to the platen 1, and a glue needle 318 is clamped and installed at the end of the glue head 317 close to the platen 1;

[0079] Referring to Figure 2 , Figure 5 and Figure 6 it can be seen that a compensation plate 321 is inserted and installed at one end of the rubber head 317 away from the rubber gun 316, a convex ring 322 is rotatably installed on the end face of the rubber head 317 close to the rubber needle 318, a copper tube 323 is clamped and installed on the outer side of the end face of the convex ring 322 close to the rubber needle 318, and the cross-sectional shape of the copper tube 323 is Z-shaped. An electric heating sleeve 324 is clamped and installed on the outer wall of one end of the copper tube 323 close to the rubber head 317;

[0080] Referring to Figure 1 and Figure 2 it can be seen that the main body unit 4 includes: a dispensing cabinet 41 arranged in the external space of the table board 1; a base 42 clamped and installed at the four corners inside the dispensing cabinet 41; steel beams 43 symmetrically arranged inside the dispensing cabinet 41 and clamped and installed with the base 42; a pneumatic slide rail 44 slidably clamped and installed at the middle position of the end face of the steel beam 43 away from the base 42; a cross rail 45 clamped and installed at one end of the pneumatic slide rail 44 away from the base 42, and the number is one; in addition, the slider 37 is slidably clamped and installed with the cross rail 45, and an observation window 46 is rotatably installed on the adjacent end faces of the dispensing cabinet 41.

[0081] How to move the negative pressure unit 2 to directly below the rubber needle 318 (with the gravity direction as the reference):

[0082] First, under the support and guidance of the cross rail 45, the slider 37 controls the straight port seat 36 to drive the tooling seat 313 and the side plate 35 to move horizontally to the specified area (away from the chip dispensing working area). Specifically, during implementation, the slider 37 can be driven by an electric slider 37 to move;

[0083] Next, the tooling seat 313 drives the rack 314 on its surface to move towards the horizontal section of the straight port seat 36 (specifically, during implementation, the tooling seat 313 can be driven by an electric slider 37). During this process, the rack 314 (one end close to the tooling seat 313) meshes with the gear 312 (the angle steel plate 311 provides further support for the meshing of the gear 312 and the rack 314 to ensure the meshing accuracy between the two, thereby improving the overall movement accuracy of the negative pressure unit 2 and reducing collision and limit). After that, the other end of the rack 314 (one end of the grid plate 38) is under the meshing action of the aforementioned gear 312, and the grid plate 38 is controlled to drive the bracket 34 to move away from the horizontal section of the straight port seat 36 (the side plate 35 creates feasibility and comfort for the overall layout of the negative pressure unit 2, and at the same time increases the stability and smoothness of the bracket 34 during movement) until the empty cartridge 21 (the end face of the empty cartridge 21 away from the table board 1) is located below the end face of the rubber needle 318 close to the table board 1;

[0084] Finally, the vertical rod 31 (strengthens the connection stiffness between itself and the side plywood 32, ensures the rotational stability of the vertical rod 31, and at the same time provides a reasonable layout environment for the vertical rod 31 and the bracket 34, improving the overall aesthetics). Driven by the DC motor 33 (or other motors of the same type), the control console plate 1 rotates towards the direction of the glue gun 316 until the empty cartridge 21 and the glue head 317 are distributed exactly opposite to each other;

[0085] The encapsulation ring 315: stabilizes the glue gun 316, ensures the consistency of glue output before and after, and at the same time ensures that the glue gun 316 can move precisely along the preset path, ensuring the dispensing position and avoiding glue droplet splashing or leakage; in addition, it reduces the failure rate and parameter fluctuations of the glue gun 316, reducing the later maintenance cost;

[0086] How the glue needle 318 enters the interior of the empty cartridge 21:

[0087] Prerequisite: At this time, the empty cartridge 21 and the glue needle 318 are distributed exactly opposite to each other:

[0088] Again, the tooling seat 313 drives the rack 314 on its surface towards the direction of the table plate 1. At this time, under the meshing action of the gear 312 and the rack 314, the bracket 34 drives the table plate 1 towards the direction of the cross rail 45 through the vertical rod 31 until the glue needle 318 enters the interior of the empty cartridge 21;

[0089] Maintaining the dryness of the surface of the glue needle 318 (or the process of reducing the glue residue on the inner wall of the glue needle 318):

[0090] Through the convex ring 322, the copper tube 323 is controlled to rotate circumferentially along the glue needle 318 under the support and guiding action of the glue head 317, and the copper tube 323 is heated by the electric heating sleeve 324 (when the electric heating sleeve 324 is specifically implemented, it can be connected to a temperature sensor to improve the accuracy of heating the temperature of the copper tube 323), preventing glue adhesion and trailing, ensuring the accuracy of the dispensing position, avoiding glue curing and blockage, and at the same time reducing the cleaning and debugging time. When specifically implemented, a transmission combination can be installed through the compensation plate 321 to drive the convex ring 322 to rotate (for example: a pulley is arranged on the outer wall of the convex ring 322);

[0091] Functions of each component of the main unit 4:

[0092] The dispensing cabinet 41: provides a fixed and storage space for the circuits supplying electronic component operations, improves the rationality of the circuit layout, avoids circuit entanglement and wear, and at the same time facilitates the later maintenance and replacement of the circuits. At the same time, the dispensing cabinet 41 can play an electromagnetic shielding role for the circuits, reducing the influence of external electromagnetic interference on the control signal and ensuring the control accuracy of the dispenser;

[0093] Base 42: Provide stable support for the control unit 3 and the negative pressure unit 2. At the same time, precisely define the overall movement distance of the slider 37, the reasonable movement path, and reduce energy consumption;

[0094] Steel beam 43: Compensate for the spatial layout margin between the glue needle 318 and the workbench (not shown), ensure the smooth implementation of glue dispensing, and at the same time provide further support for the cross rail 45;

[0095] Pneumatic slide rail 44: Increase the movement mode of the negative pressure unit 2 and the control unit 3 to ensure the accuracy of the glue dispensing position;

[0096] Observation window 46: Observe the glue dispensing process, promptly adjust the glue leakage and the deviation of the glue dispensing position to ensure the glue dispensing quality; Monitor the operation status of the equipment, facilitate fault troubleshooting, and ensure safety at the same time.

[0097] Refer to Figure 2 、 Figure 7 、 Figure 8 and Figure 10 As can be seen from

[0098] Refer to Figure 7 、 Figure 9 、 Figure 11 and Figure 12It can be seen that a column 211 which is slidably clamped and installed inside the keyway 29 and is slidably clamped and fitted with the arc groove 27 is installed. One end of the column 211 away from the end cover 22 is clamped and installed with a panel 212 slidably installed on the coaxial disk 28. One end of the panel 212 close to the axis of the empty cartridge 21 is clamped and installed with a bridging plate 213. One end of the bridging plate 213 away from the column 211 is clamped and installed with a sealing plate 214. One side end face of the sealing plate 214 close to the end cover 22 is in contact with the side end face of the coaxial disk 28 away from the end cover 22. And the cross-sectional shape of the sealing plate 214 is a quarter circle. A rubber strip 215 is clamped and installed on the vertical side wall of the sealing plate 214. In the middle position of the inner wall of the empty cartridge 21, a tail plate 216 is rotatably fitted. An arc groove 27 is also provided on the surface of the tail plate 216. One end of the inner wall of the empty cartridge 21 close to the end cover 22 is clamped and installed with a control disk 217. An orifice is provided on the surface of the control disk 217, and the cross-sectional shape of the orifice is the same as that of the keyway 29. A vertical rod 218 which is slidably clamped and installed on the inner wall of the orifice and is slidably clamped and fitted with the tail plate 216 is installed. One end of the vertical rod 218 close to the tail plate 216 is clamped and installed with an angle plate 219, and the thickness of the angle plate 219 is equal to the vertical distance between the tail plate 216 and the control disk 217;

[0099] Refer to Figure 12 It can be seen that a rubber spatula 221 is clamped and installed at the end of the angle plate 219 close to the axis of the empty cartridge 21. And the rubber spatula 221 is a quarter circle. Chamfering is done at one end of the rubber spatula 221 close to the axis of the empty cartridge 21. A sealing strip 222 is clamped and installed on the outer wall of the vertical section of the rubber spatula 221;

[0100] Refer to Figure 7 、 Figure 8 and Figure 10 It can be seen that nozzles 231 are circumferentially and evenly inserted and installed on the outer wall of the empty cartridge 21. And the nozzles 231 are between the shaft disk 28 and the control disk 217. A filter plate 232 is clamped and installed on the inner wall of one end of the nozzle 231 close to the axis of the empty cartridge 21. A ring pipe 233 is provided at one end of the nozzle 231 away from the filter plate 232, and the number is one. An interface valve 234 which is connected and communicated with the nozzle 231 is clamped and installed on the inner wall of the ring pipe 233, and the number and position of the interface valves 234 correspond to those of the nozzles 231 one by one. An angle valve 235 is clamped and installed on the outer wall of the ring pipe 233, and the number of the angle valves 235 is one;

[0101] Refer to Figure 7 、 Figure 8 、 Figure 9 and Figure 13It can be seen that a cleaning chamber 241 is inserted and installed at the axis inside the empty bobbin 21. A cleaning roller 242 is circumferentially clamped and installed on the inner wall of the bottom side of the cleaning chamber 241. The inside of the cleaning roller 242 is of a hollow structure. Brushes 243 are circumferentially and evenly clamped and installed on the outer wall of the cleaning roller 242. Atomizing nozzles 244 are evenly distributed on the outer wall of the cleaning roller 242, and the atomizing nozzles 244 and the brushes 243 are alternately distributed. A glue outlet 245 is jointly opened between the cleaning chamber 241 and the table board 1 for discharging the colloidal waste liquid. A drain pipe 246 connected to the cleaning chamber 241 is clamped and installed at one end of the table board 1 away from the end cover 22. An air valve 247 is inserted and installed on the outer wall of the empty bobbin 21, and the air valve 247 is located between the table board 1 and the end plate 216. A micro vacuum pump 248 cooperating with the air valve 247 is clamped and installed at one end of the table board 1 away from the end cover 22.

[0102] The first method for cleaning the glue residues on the inner walls of the glue head 317 and the glue needle 318:

[0103] The formation process of the non-linear pulse among the glue needle 318, the glue head 317 and the empty bobbin 21:

[0104] Precondition: In the initial state, the glue scrapers 221 are in contact with each other, that is, all the glue scrapers 221 jointly form a circle;

[0105] After the aforementioned control unit 3 controls the glue needle 318 to enter the empty bobbin 21, the contact between the glue needle 318 and the glue scraper 221 is used as the stop motion signal (in specific implementation, the contact signal can be realized by a pressure sensor, or the rising height of the bracket 34 can be accurately calculated to avoid collision limit);

[0106] First, stop the glue output, close the communication channel between the glue head 317 and the glue gun 316 (for example: valve needle type, piston type or ball valve type). Then, pump external hot air into the glue head 317 through an external hose by an air pump 39 (in specific implementation, the external hot air can be artificially synthesized, for example, by heating a unit gas through a heating device)

[0107] Before this (when the glue needle 318 enters the empty bobbin 21):

[0108] The ear seat 25 drives the end cover 22 to rotate at one end of the empty bobbin 21 (away from the table board 1) synchronously under the control of the shaft seat 26 (in specific implementation, an electric slider 37 or a circular guide rail can be used to drive the shaft seat 26 to stably rotate under the limiting action of the annular groove 24);

[0109] At this time, when the end cover 22 rotates, the arc groove 27 on its surface makes the column 211 have an axial rotation tendency. Under the support and guidance of the shaft plate 28 (the key groove 29 changes the movement mode of the column 211, that is, the rotation of the end cover 22 is converted into the radial translation of the column 211), the panel 212 controls the bridge plate 213 to drive the sealing plate 214 to move toward the axial end of the empty package tube 21, until the sealing plate 214 conflicts with the outer wall of the glue needle 318, and at this time, the adjacent corner strips contact each other (so as to improve the isolation between the empty package tube 21 and the outside);

[0110] In a specific implementation, the width and length of the key slot 29 are smaller than the panel 212, that is, the panel 212 can always fully cover the key slot 29 during the movement (to prevent the empty package tube 21 from interacting with the outside through the key slot 29);

[0111] Next, the micro vacuum pump 248 is connected to the air valve 247 through an external hose, and then the gas inside the empty bag 21 is extracted;

[0112] Finally, during the rotation of the tail plate 216, the vertical rod 218 is caused to limit the position of the mouth groove and the arc groove 27, and the angle plate 219 is controlled under the guidance of the node plate 217, so as to drive the glue shovel 221 to continuously reciprocate along the radial direction of the empty package tube 21 (the vertical rod 218 is clamped with the angle plate 219 at one end close to the tail plate 216, and the thickness of the angle plate 219 is equal to the vertical distance between the tail plate 216 and the node plate 217. The purpose is to ensure that when the glue shovel 221 contacts each other, the node plate 217 can completely separate the upper and lower areas of the empty package tube 21, and ensure the rationality of the micro vacuum pump 248 to extract the gas in the local area of the empty package tube 21);

[0113] That is, the area of the glue head 317 and the glue needle 318 is in a high-pressure area due to the action of the hot air and the air pump 39, and the area of the node disk 217 inside the empty tube 21 close to the platen 1 is in a low-pressure area due to gas loss. When the glue shovel 221 is continuously reciprocating and separating, under the action of the pressure difference (and by changing the rotation speed of the tail disk 216, a nonlinear contact blockage between the glue shovel 221 and the outlet of the glue needle 318 is implemented, thereby changing the instantaneous pressure pulse peak between the glue head 317, the glue needle 318 and the empty tube 21), the glue residue on the inner wall of the glue needle 318 and the glue head 317 is continuously separated and enters the interior of the cleaning room 241;

[0114] In specific implementation, the tail plate 216 can be driven to rotate (with a non-constant rotation speed) by the annular guide rail or the electric slider 37, and during this process, the drainage tube 246 is not connected to the outside;

[0115] Method 2 for cleaning glue residue on the inner wall of the glue head 317 and the glue needle 318:

[0116] Similarly, air is supplied by the micro vacuum pump 248 and exhausted by the air pump 39. Meanwhile, the glue solvent after external atomization treatment is guided to the annular pipe 233 through the angle valve 235, and then distributed to different nozzles 231 through the interface valve 234. After further cutting and refinement through the filter plate 232, it flows to the empty cartridge 21 (between the indexing plate 217 and the shaft disc 28);

[0117] Finally, through the reciprocating movement of the rubber spatula 221 again, another pressure difference is formed between the rubber head 317, the glue needle 318 and the empty cartridge 21 (the area of the empty cartridge 21 is at high pressure, and the areas of the glue needle 318 and the rubber head 317 are at low pressure). The glue solvent in the internal space of the empty cartridge 21 continuously covers and merges with the glue residue areas on the inner walls of the glue needle 318 and the rubber head 317 under the action of pressure, so as to further wash and degrade the glue residue, further improve the cleanliness of the inner walls of the rubber head 317 and the glue needle 318, and thus improve the consistency of glue dispensing before and after the glue dispenser;

[0118] Cleaning process of the outlet end of the glue needle 318:

[0119] The reciprocating movement of the glue needle 318 is controlled by the control unit 3 (at this time, the rubber spatula 221 is in a separated state);

[0120] During this process, the outer wall of the glue needle 318 is cleaned through the relative movement between the brush 243 and the outer wall of the glue needle 318, and the spraying action of the atomizing nozzle 244 (the glue solvent is pumped into the cleaning roller 242 through an external pressure pump and a water pipe). The glue waste liquid flows to the external collection device through the glue port 245 and the drainage pipe 246. Finally, when the glue needle 318 is separated from the empty cartridge 21, the glue needle 318 is dried by the copper pipe 323;

[0121] After the cleaning is completed, the vertical rod 31 drives the control panel 1 to drive the negative pressure unit 2 back to the initial position again.

[0122] The cleaning method of a glue dispensing device for high-precision variable control provided by the present invention is as follows: The first step: First, the tooling seat 313 drives the rack 314 on its surface to move towards the cross rail 45. During this process, through the meshing action between the gear 312 and the rack 314, the grid plate 38 synchronously controls the bracket 34 to drive the whole negative pressure unit 2 to move away from the cross rail 45 under the guiding and supporting action of the side plate 35 until the negative pressure unit 2 is located at the gravity-facing end of the glue needle 318. Thereafter, the DC motor 33 drives the vertical rod 31 to drive the table board 1 to rotate by a specified angle until the empty cartridge 21 and the glue needle 318 are distributed opposite to each other;

[0123] Step 2: Then, control the glue needle 318 to move away from the cross rail 45 again through the tooling seat 313 until the glue needle 318 enters the inside of the empty package cylinder 21. At this time, when the end cover 22 is in a rotating state, the column 211 is forced by the dual limiting effects of the keyway 29 and the arc groove 27, and the panel 212 controls the bridging plate 213 to drive the sealing plate 214 to move towards the axial end of the empty package cylinder 21 until the sealing plate 214 contacts the outer wall of the glue needle 318. At the same time, the vertical rod 218 is controlled by the tail plate 216 and synchronously drives the angle plate 219 to move towards the axial end of the empty package cylinder 21 until the glue shovels 221 come into contact with each other.

[0124] Step 3: Finally, fill the inside of the glue needle 318 and the glue head 317 with hot gas through the air pump 39. At the same time, evacuate all the gas existing inside the empty package cylinder 21 through the micro vacuum pump 248. After that, control the vertical rod 218 through the tail plate 216 to continuously drive the glue shovels 221 to reciprocate. Specifically, during implementation, the non-linear movement of the glue shovels 221 can be achieved by controlling the rotation speed of the tail plate 216, so as to realize the non-linear pulse fluctuation between the glue needle 318, the glue head 317 and the empty package cylinder 21. Through the aforementioned non-linear pulse fluctuation, the glue residues existing on the inner wall of the glue needle 318 are flushed under negative pressure, which helps to improve the cleanliness of the inner wall of the glue needle 318.

[0125] The circuits and controls involved in the present invention are all prior arts and will not be elaborated herein.

[0126] The above are only embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A dispensing device for high-precision variable control, comprising a table board (1), characterized in that: One end of the platen (1) is provided with a negative pressure unit (2), one side of the negative pressure unit (2) is provided with a regulation unit (3), and the outer space of the negative pressure unit (2) is provided with a main body unit (4); The negative pressure unit (2) includes: An empty cartridge (21), which is snap-fitted and installed at one end of the platen (1); An end cap (22), which is rotatably installed at the end of the empty cartridge (21) away from the platen (1); A ring rail (23), which is snap-fitted and installed on the outer wall of the end of the empty cartridge (21) away from the platen (1); in addition, a ring groove (24) is provided on the end face of the ring rail (23) away from the platen (1); An ear seat (25), at least one, and is snap-fitted and installed on the outer wall of the end cap (22); A shaft seat (26), which is inserted and installed in the middle position of the ear seat (25), and is slidably snap-fitted between the shaft seat (26) and the ring groove (24); Arc grooves (27) are evenly provided on the surface of the end cap (22); A shaft disc (28), which is provided on the side of the end cap (22) close to the platen (1), and is snap-fitted and installed between the shaft disc (28) and the empty cartridge (21); in addition, a key groove (29) corresponding to the arc groove (27) is provided on the surface of the shaft disc (28).

2. The dispensing device for high-precision variable control according to claim 1, characterized in that: A column (211) that is slidably snap-fitted in the key groove (29) and is slidably snap-fitted with the arc groove (27) is installed. One end of the column (211) away from the end cap (22) is snap-fitted with a panel (212) that is slidably installed with the shaft disc (28). One end of the panel (212) close to the axis of the empty cartridge (21) is snap-fitted with a bridging plate (213). One end of the bridging plate (213) away from the column (211) is snap-fitted with a sealing plate (214). The end face of the sealing plate (214) close to the end cap (22) is in contact with the end face of the shaft disc (28) away from the end cap (22). The cross-sectional shape of the sealing plate (214) is a quarter circle. A rubber strip (215) is snap-fitted and installed on the vertical side wall of the sealing plate (214). A tail plate (216) is rotatably fitted in the middle position of the inner wall of the empty cartridge (21), and arc grooves (27) are also provided on the surface of the tail plate (216). A regulating disc (217) is snap-fitted and installed at one end of the inner wall of the empty cartridge (21) close to the end cap (22). An opening groove is provided on the surface of the regulating disc (217), and the cross-sectional shape of the opening groove is the same as that of the key groove (29). A vertical rod (218) that is slidably snap-fitted with the tail plate (216) is slidably snap-fitted and installed on the inner wall of the opening groove. One end of the vertical rod (218) close to the tail plate (216) is snap-fitted with an angle plate (219), and the thickness of the angle plate (219) is equal to the vertical distance between the tail plate (216) and the regulating disc (217).

3. The dispensing device for high-precision variable control according to claim 2, characterized in that: A rubber spatula (221) is snap-fitted and installed at the end of the angle plate (219) close to the axis of the empty cartridge (21), and the rubber spatula (221) is a quarter circle, and the end of the rubber spatula (221) close to the axis of the empty cartridge (21) is chamfered. A sealing strip (222) is snap-fitted and installed on the outer wall of the vertical section of the rubber spatula (221).

4. The dispensing device for high-precision variable control according to claim 2, wherein: The outer wall of the hollow barrel (21) is evenly plugged with nozzles (231) in the circumferential direction, and the nozzles (231) are located between the shaft disc (28) and the section disc (217). A filter plate (232) is clamped and mounted on the inner wall of one end of the nozzle (231) close to the axis of the hollow barrel (21). An annular tube (233) is provided at one end of the nozzle (231) away from the filter plate (232). An interface valve (234) connected to the nozzle (231) is clamped and mounted on the inner wall of the annular tube (233). The number and position of the interface valves (234) correspond to those of the nozzles (231) one by one. An angle valve (235) is clamped and mounted on the outer wall of the annular tube (233). The number of the angle valve (235) is one.

5. A dispensing device for high-precision variable control according to claim 2, characterized in that: A cleaning chamber (241) is inserted and installed at the axis center of the hollow cylinder (21); a cleaning roller (242) is circumferentially clamped and installed on the inner wall of the bottom side of the cleaning chamber (241); the interior of the cleaning roller (242) is a hollow structure; a brush (243) is uniformly clamped and installed on the outer wall of the cleaning roller (242); atomizing nozzles (244) are uniformly distributed on the outer wall of the cleaning roller (242); the atomizing nozzles (244) and the brushes (243) are alternately distributed; the cleaning chamber (241) and the cleaning roller (242) are arranged in a uniform manner; A glue port (245) is provided between the above-mentioned platforms (1) for draining out the waste colloidal liquid. A drainage pipe (246) connected to the cleaning chamber (241) is mounted on one end of the platform (1) away from the end cover (22). An air valve (247) is installed on the outer wall of the empty package tube (21). The air valve (247) is located between the platform (1) and the tail plate (216). A micro vacuum pump (248) matched with the air valve (247) is mounted on one end of the platform (1) away from the end cover (22).

6. The dispensing device for high-precision variable control according to claim 1, wherein: The control unit (3) comprises: A vertical rod (31) is plugged and installed at a middle position of one end of the table (1) away from the empty package tube (21); The side panels (32) are symmetrically clamped and mounted on the outer wall of the vertical rod (31); The DC motor (33) is mounted on the end of the vertical rod (31) away from the table (1) through a mounting seat, and the output end of the DC motor (33) is mounted in a matching manner with the vertical rod (31); A bracket (34), the number of which is one and which is mounted on the outer walls of the two side panels (32) by snap-fitting; A side plate (35) is slidably mounted on one end of the bracket (34); A straight seat (36) is mounted on the side wall of the side plate (35) by clamping; A slider (37) is slidably mounted on the end of the straight seat (36) away from the table (1); A grid plate (38) is mounted between horizontal sections at one end of the bracket (34); The air pump (39) is mounted by clamping on the end surface of the bracket (34) away from the grid plate (38).

7. The dispensing device for high-precision variable control according to claim 6, wherein: At the middle position of the outer wall of the grid plate (38), an angle steel plate (311) is detachably installed through bolts. At one end of the angle steel plate (311) near the middle position of the bracket (34), a gear (312) is rotatably installed through a rotating shaft. A tooling seat (313) is slidably clamped and installed on the vertical section of the straight port seat (36). Rack bars (314) meshing with the gear (312) are clamped and installed between the opposite surfaces of the tooling seat (313) and the grid plate (38). Sealing rings (315) are symmetrically clamped and installed on one end face of the tooling seat (313) away from the straight port seat (36). A glue gun (316) is clamped and installed between the two sealing rings (315). A glue head (317) is clamped and installed at one end of the glue gun (316) near the table board (1). A glue needle (318) is clamped and installed at one end of the glue head (317) near the table board (1).

8. The dispensing device for high-precision variable control according to claim 7, characterized in that: A compensation plate (321) is inserted and installed at one end of the glue head (317) away from the glue gun (316). A convex ring (322) is rotatably fitted on one end face of the glue head (317) near the glue needle (318). A copper tube (323) is clamped and installed on the outer side of one end face of the convex ring (322) near the glue needle (318), and the cross-sectional shape of the copper tube (323) is Z-shaped. An electric heating sleeve (324) is clamped and installed on the outer wall of one end of the copper tube (323) near the glue head (317).

9. The dispensing device for high-precision variable control according to claim 6, wherein: The main body unit (4) includes: A dispensing cabinet (41) arranged in the external space of the table board (1); A base (42) clamped and installed at the four corners inside the dispensing cabinet (41); Steel beams (43) symmetrically arranged inside the dispensing cabinet (41), and the steel beams (43) are clamped and fitted with the base (42); A pneumatic slide rail (44) slidably clamped and installed at the middle position of one end face of the steel beam (43) away from the base (42); A cross rail (45) clamped and installed at one end of the pneumatic slide rail (44) away from the base (42), and the number of the cross rails (45) is one; in addition, the slider (37) is slidably clamped and fitted with the cross rail (45). An observation window (46) rotatably fitted on the adjacent end faces of the dispensing cabinet (41).

Images