System and method for automatically controlling glue output and glue coating consistency

Abstract

The application discloses a system and method for automatically controlling glue output and glue coating consistency, comprising a glue coating quality detection device and a central controller; the glue coating quality detection device detects glue coating quality; the central controller acquires information about the viscosity of the adhesive, and according to the viscosity interval, the central controller matches a suitable engine running speed and automatic glue valve opening and closing buffer time; then the central controller further adjusts the moving speed of a glue coating robot and the buffer time of the automatic glue valve according to the glue coating quality information.

Description

Technical Field

[0001] This invention belongs to the field of glue application, specifically relating to a system and method for automatically controlling the amount of glue dispensed and ensuring consistent glue application. Background Technology

[0002] With the upgrading of intelligent manufacturing, automated and intelligent processes have been widely promoted. The glue application process has also adopted automated equipment to replace manual labor. However, most of the current automatic glue application equipment is open-loop controlled. When the subsequent inspection equipment finds abnormal glue application quality, manual adjustment or glue replenishment is required, which cannot guarantee the consistency of glue application. By analyzing the causes of abnormal glue application quality and confirming them through experiments, a control method is proposed to ensure the consistency of glue application by automatic glue application equipment.

[0003] Current automated adhesive application equipment has various parameters pre-set, such as robot running speed, adhesive dispensing pressure, and valve opening / closing buffer time. Workpieces are transported from the production line or pallet to the corresponding workstation, positioned by a positioning device, and then the adhesive application equipment activates to apply the adhesive. Under conditions where variations in adhesive viscosity and compressed air pressure are minimal, stable dispensing and consistent application can be maintained. However, in actual use, variations in adhesive viscosity between batches and significant pressure drops in compressed air during peak production periods can lead to inconsistencies in application consistency, affecting the overall quality of the adhesive application.

[0004] Patent CN 201910284326.4 discloses an adhesive application device, comprising: a device body; an adhesive tube for storing adhesive, the adhesive tube including an adhesive outlet, an adhesive application needle disposed at the end of the adhesive outlet, the adhesive flowing out from the adhesive outlet through the adhesive application needle; an adhesive dispensing pressure control device for controlling the amount of adhesive dispensed by the adhesive application needle through pressure; a mechanism moving device for controlling the moving position and moving speed of the adhesive application needle; and an adhesive quality monitoring device disposed inside the adhesive tube at the adhesive outlet position for real-time monitoring. The adhesive viscosity and dispensing volume monitoring device are located on one side of the dispensing needle and are used to monitor the cross-sectional area of ​​the adhesive line formed by the adhesive flowing out of the dispensing needle at different angles. The adhesive quality monitoring device and the dispensing volume monitoring device are used to transmit the monitoring results to the dispensing pressure control device and the mechanism moving device in real time, respectively. By adjusting the dispensing pressure and the moving speed of the dispensing needle relative to the substrate, the amount of adhesive applied to the substrate is controlled in real time. However, this control method has low accuracy and poor dispensing consistency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a system and method for automatically controlling the amount of glue dispensed and ensuring consistent glue application.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0007] This invention provides an automatic glue dispensing system for controlling glue output and coating consistency, comprising a dispensing tank, a filtration and pressure regulating device, a glue supply hose, an automatic dispensing valve, a glue dispensing robot, a glue dispensing quality detection device, and a central controller. The filtration and pressure regulating device is installed at the outlet of the dispensing tank, and is connected to the automatic dispensing valve via the glue supply hose. The automatic dispensing valve is mounted on the glue dispensing robot. The glue dispensing quality detection device is used to detect the glue dispensing quality. The central controller controls the moving speed of the glue dispensing robot and the buffer time of the automatic dispensing valve based on adhesive viscosity information and glue dispensing quality information.

[0008] As a further technical solution, the adhesive coating quality inspection device is a visual inspection device.

[0009] As a further technical solution, the discharge tank is connected to a nitrogen pressurization device.

[0010] As a further technical solution, the discharge tank is also equipped with a pressure detection device.

[0011] Secondly, the present invention also discloses a method for automatically controlling the amount of glue dispensed and the consistency of glue application, including a glue application quality detection device and a central controller; the glue application quality detection device detects the glue application quality.

[0012] The central controller acquires adhesive viscosity information. Based on the viscosity range, the central controller matches a suitable engine operating speed N and an automatic dispensing valve switching buffer time. Then, based on the adhesive application quality information, the central controller adjusts the moving speed of the adhesive application robot and the buffer time of the automatic dispensing valve.

[0013] As a further technical solution, the viscosity of the adhesive is divided into multiple intervals according to the viscosity of the adhesive, and each interval is matched with an engine running speed and an automatic dispensing valve opening and closing buffer time.

[0014] As a further technical solution, during the glue application process, the nozzle diameter, glue dispensing pressure, and boosting pressure are fixed parameters.

[0015] As a further technical solution, when the glue supply pressure drops to the lower limit, the glue application robot's operating speed decreases by one level, and the switching valve buffer time changes synchronously. If the glue application robot has no level to decrease, it will stop and alarm.

[0016] As a further technical solution, when the adhesive application quality is abnormal, an alarm is issued, the robot's running speed is adjusted, and further adjustments are made based on the feedback until the quality is normal.

[0017] Thirdly, the present invention provides a control method for the automatic glue dispensing control and glue coating consistency system, comprising the following steps:

[0018] Begin with step 1;

[0019] Step 2: Input the adhesive viscosity into the central controller to automatically match the appropriate glue-applying robot running speed and the automatic dispensing valve opening and closing buffer time;

[0020] Step 3: Determine if the pressure in the storage tank meets the requirements. If yes, proceed to step 5; otherwise, proceed to step 4.

[0021] Step 4: Determine if the operating speed of the glue-applying robot can be reduced; if yes, reduce the operating speed of the glue-applying robot and proceed to step 5; if no, stop the machine and sound an alarm.

[0022] Step 5: Complete the adhesive application and perform visual inspection;

[0023] Step 6: Determine if the adhesive application quality is good. If yes, proceed to step 11; otherwise, obtain the quality status and proceed to step 7.

[0024] Step 7: Determine if the amount of glue is too much. If yes, proceed to step 8; otherwise, proceed to step 10.

[0025] Step 8: Determine if the speed of the glue-applying robot can be increased. If yes, proceed to step 9; otherwise, stop the robot and trigger an alarm.

[0026] Step 9: Increase the operating speed of the glue-applying robot, then return to step 5;

[0027] Step 10: Determine if the speed of the glue-applying robot can be reduced. If not, stop the robot and sound an alarm. If yes, reduce the speed of the glue-applying robot to apply glue. After the glue application is complete, return to step 6.

[0028] Step 11 is complete.

[0029] The beneficial effects of the above embodiments of the present invention are as follows:

[0030] This invention achieves better control over adhesive application consistency by matching the running time of the dispensing robot with the automatic buffer time of the automatic dispensing valve, adapting to adhesives of different viscosities, and using visual inspection to check the application quality. It also responds to quality anomalies, forming a closed loop. Furthermore, it monitors external factors such as storage tank pressure, providing timely alarms and responses to any abnormalities. Attached Figure Description

[0031] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0032] Figure 1 This is a schematic diagram of the automatic glue application equipment proposed in this invention;

[0033] Figure 2 This is a flowchart illustrating the operating logic of the automatic glue application equipment proposed in this invention.

[0034] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0035] 1. Nitrogen booster, 2. Storage tank, 3. Filter and pressure regulating device, 4. Adhesive supply hose, 5. Automatic dispensing valve, 6. Vision inspection device, 7. Adhesive application robot, 8. Cleaning and switching inlet, 9. Central controller. Detailed Implementation

[0036] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] Terminology Explanation: The terms "installation," "connection," "linking," and "fixing" in this invention should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction relationship between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] As described in the background section, the existing technology has shortcomings. In order to solve the above-mentioned technical problems, this invention proposes a system and method for automatically controlling the amount of glue dispensed and the consistency of glue application.

[0040] In a typical embodiment of the present invention, such as Figure 1As shown, the automatic glue dispensing control system for ensuring glue quantity and consistency proposed in this invention includes: a nitrogen pressurization device 1, a storage tank 2, a filter and pressure regulating device 3, a glue supply hose 4, an automatic dispensing valve 5, a vision inspection device 6, and a glue application robot 7. The adhesive is stored in the storage tank 2, pressurized by the nitrogen pressurization device 1, and then regulated to a stable dispensing pressure by the filter and pressure regulating device 3. This pressure is then transmitted to the automatic dispensing valve 5 via the glue supply hose 4, and the glue application robot 7 drives the application. After application, the glue application quality is detected by the vision inspection device 6. The central controller collects the storage tank pressure information P, the visually detected glue application quality information Q, and controls the engine operating speed N and the automatic dispensing valve buffer time T.

[0041] Furthermore, the automatic dispensing valve in this embodiment comprises three parts connected vertically: a cylinder, a valve body, and a material cylinder. The cylinder and valve body are separated by an advanced sealing material to prevent adhesive from entering the cylinder. The material cylinder is connected to the valve body of the dispensing valve, ensuring concentricity with the cylinder. A solenoid valve drives the cylinder, thereby driving the central rod to move up and down. The up and down movement of the central rod achieves the opening and closing of the adhesive dispensing process.

[0042] Furthermore, in this embodiment, the buffer time of the automatic dispensing valve is used as a control parameter. The principle is as follows: a fast robot walking speed will cause the adhesive to break and become discontinuous (too little adhesive), while a slow speed will cause the adhesive to pile up (too much adhesive), which will not meet the dispensing requirements. At the same time, it was found that a long buffer time for opening and closing the dispensing valve will lead to an extended dispensing cycle, while a short buffer time will cause the dispensing valve to drip continuously, which will also not meet the dispensing requirements. Therefore, in this embodiment, the appropriate running speed and corresponding buffer time should be calibrated in advance according to the different viscosity of the adhesive.

[0043] The operation process of the above-mentioned device for controlling the glue application is as follows:

[0044] Each batch of adhesive is sampled and inspected to obtain the adhesive viscosity information C, which is input into the central controller as a parameter. Based on the viscosity range, the central controller matches an appropriate engine operating speed N and automatic dispensing valve opening and closing buffer times Tk (valve opening buffer time) and Tg (valve closing buffer time) to ensure adhesive dispensing volume and consistency. Adhesive quality is detected by a vision inspection device 6, outputting three states: normal (state 1), insufficient adhesive dispensing (state 2), and excessive adhesive dispensing (state 3). This feedback is sent to the central controller, which automatically adjusts the dispensing robot's operating speed and buffer time based on the feedback to ensure dispensing quality. The system also monitors the storage tank pressure. When the pressure drops to a certain limit, an alarm is triggered. If there is no response, the dispensing robot's operating speed is reduced to ensure sufficient adhesive dispensing volume.

[0045] Furthermore, based on the different viscosities of the adhesive, a suitable running speed and corresponding buffer time are pre-calibrated. The specific calibration table is as follows:

[0046]

[0047] In the table above, a one-to-one correspondence is established between the valve switching buffer time, robot operating speed, and adhesive viscosity. Matching speed settings are configured according to requirements, with the robot's operating speed gradually increasing or decreasing at each setting, automatically matching the appropriate setting based on the input viscosity. Other parameters, such as nozzle diameter, dispensing pressure, and boosting pressure, are also calibrated experimentally and fixed parameters are selected. Due to the small range of viscosity variation, no further differentiation is performed.

[0048] In addition, the pressure of the storage tank is the power source for supplying adhesive, so it is also necessary to calibrate the relationship between the storage tank pressure and the operating speed. Since a filter pressure regulating device is installed in the device in this embodiment, it is only necessary to ensure the lower limit of the storage tank pressure.

[0049]

[0050] When the pressure drops to the lower limit, the machine speed decreases by one level, and the buffer time of the switching valve changes accordingly.

[0051] If there is no gear to reduce the robot's operating speed, a shutdown alarm will be triggered.

[0052] Simultaneously, it receives feedback on the adhesive application quality and automatically adjusts the setting based on the feedback status information, with the following logic:

[0053]

[0054]

[0055] If the glue application quality is abnormal, an alarm will be issued, and the robot's running speed will be adjusted. The adjustment will continue based on the feedback until the normal operation is achieved.

[0056] If there are no gears to adjust the robot's running speed, a shutdown alarm will be triggered.

[0057] Furthermore, the operational logic diagram corresponding to the control method proposed in this embodiment is as follows: Figure 2 The overall control method is as follows:

[0058] Step 1 begins

[0059] Step 2: Input the adhesive viscosity into the controller to automatically match the appropriate glue-applying robot running speed N and the automatic dispensing valve opening and closing buffer time;

[0060] Step 3: Determine if the pressure in the storage tank meets the requirements. If yes, proceed to step 5; otherwise, proceed to step 4.

[0061] Step 4: Determine if the operating speed of the glue-applying robot can be reduced; if yes, reduce the operating speed of the glue-applying robot and proceed to step 5; if no, stop the machine and sound an alarm.

[0062] Step 5: Complete the adhesive application and perform visual inspection;

[0063] Step 6: Determine if the adhesive application quality is good. If yes, proceed to step 11; otherwise, obtain the quality status and proceed to step 7.

[0064] Step 7: Determine if the amount of glue is too much. If yes, proceed to step 8; otherwise, proceed to step 10.

[0065] Step 8: Determine if the speed of the glue-applying robot can be increased. If yes, proceed to step 9; otherwise, stop the robot and trigger an alarm.

[0066] Step 9: Increase the operating speed of the glue-applying robot, then return to step 5;

[0067] Step 10: Determine if the speed of the glue-applying robot can be reduced. If not, stop the robot and sound an alarm. If yes, reduce the speed of the glue-applying robot to apply glue. After the glue application is complete, return to step 6.

[0068] Step 11 is complete.

[0069] This invention achieves better control over adhesive application consistency by matching the running time of the dispensing robot with the automatic buffer time of the automatic dispensing valve, adapting to adhesives of different viscosities, and using visual inspection to check the application quality. It also responds to quality anomalies, forming a closed loop. Furthermore, it monitors external factors such as storage tank pressure, providing timely alarms and responses to any abnormalities.

[0070] Finally, it should be noted that relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A system for automatically controlling the amount of glue dispensed and ensuring consistent glue application, characterized in that, The system includes a discharge tank, a filtration and pressure regulating device, a glue supply hose, an automatic glue dispensing valve, a glue application robot, a glue application quality detection device, and a central controller. The filtration and pressure regulating device is installed at the outlet of the discharge tank. The filtration and pressure regulating device is connected to the automatic glue dispensing valve through the glue supply hose. The automatic glue dispensing valve is installed on the glue application robot. The glue application quality detection device is used to detect the glue application quality. The central controller controls the moving speed of the glue application robot and the buffer time of the automatic glue dispensing valve based on the glue application quality information and the viscosity of the adhesive. The adhesive coating quality inspection device is a visual inspection device, the discharge tank is connected to a nitrogen pressurization device, and the discharge tank is also equipped with a pressure detection device. The control method based on an automatic glue dispensing system for controlling glue dispensing volume and coating consistency includes the following steps: Begin with step 1; Step 2: Input the adhesive viscosity into the central controller to automatically match the appropriate glue-applying robot running speed and the automatic dispensing valve opening and closing buffer time; Based on the viscosity of the adhesive, the viscosity of the adhesive is divided into multiple ranges, and each range is matched with an engine running speed and an automatic dispensing valve opening and closing buffer time. Step 3: Determine if the pressure in the storage tank meets the requirements. If yes, proceed to step 5; otherwise, proceed to step 4. Step 4: Determine if the operating speed of the glue-applying robot can be reduced; if yes, reduce the operating speed of the glue-applying robot and proceed to step 5; if no, stop the machine and sound an alarm. Step 5: Complete the adhesive application and perform visual inspection; Step 6: Determine if the adhesive application quality is good. If yes, proceed to step 11; otherwise, obtain the quality status and proceed to step 7. Step 7: Determine if the amount of glue is too much. If yes, proceed to step 8; otherwise, proceed to step 10. Step 8: Determine if the speed of the glue-applying robot can be increased. If yes, proceed to step 9; otherwise, stop the robot and trigger an alarm. Step 9: Increase the operating speed of the glue-applying robot, then return to step 5; Step 10: Determine if the speed of the glue-applying robot can be reduced. If not, stop the robot and sound an alarm. If yes, reduce the speed of the glue-applying robot and proceed with the glue application. After the glue application is complete, return to step 6. Step 11 is complete.

2. A method for automatically controlling the amount of glue dispensed and ensuring the consistency of glue application, comprising a system for automatically controlling the amount of glue dispensed and ensuring the consistency of glue application as described in claim 1, including a glue application quality detection device and a central controller; Its features are, The adhesive coating quality testing device is used to test the adhesive coating quality. The central controller acquires adhesive viscosity information. Based on the viscosity range, the central controller matches a suitable operating speed for the adhesive application robot and a buffer time for the automatic dispensing valve. Then, based on the adhesive application quality information, the central controller further adjusts the moving speed of the adhesive application robot and the buffer time of the automatic dispensing valve.

3. The method for automatically controlling the amount of glue dispensed and ensuring consistent glue application as described in claim 2, characterized in that, During the glue application process, the nozzle diameter, glue dispensing pressure, and boosting pressure are fixed parameters.

4. The method for automatically controlling the amount of glue dispensed and ensuring consistent glue application as described in claim 2, characterized in that, Simultaneously, the pressure of the storage tank is monitored. When the glue supply pressure drops to the lower limit, the glue application robot's operating speed is reduced by one level, and the buffer time of the switching valve changes synchronously. If the glue application robot has no level to reduce, a shutdown alarm is triggered.

5. The method for automatically controlling the amount of glue dispensed and ensuring consistent glue application as described in claim 2, characterized in that, If the glue application quality is abnormal, an alarm will be issued, and the robot's running speed will be adjusted. The adjustment will continue based on the feedback until the normal operation is achieved.

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