A gluing device with cleaning function

Abstract

The application discloses a gluing device with cleaning function, which comprises a middle glue mixing barrel, a dispenser, a gluing cutter head and an air source. The middle glue mixing barrel is adapted to continuously provide glue liquid to the dispenser through a pipeline. The dispenser is adapted to uniformly deliver the glue liquid to the inner cavity of the gluing cutter head through a glue outlet pipe, so that the gluing cutter head is used for gluing the surface of a solar panel. The air source is connected with the dispenser, and the air source is adapted to provide high-pressure airflow to the dispenser when gluing is stopped, so that the remaining glue in the dispenser, the glue outlet pipe and the inner cavity is discharged under the action of the airflow. The application has the beneficial effects that: by connecting the dispenser with the air source, the dispenser and the downstream pipeline and the gluing cutter head part are cleaned by using high-pressure gas at shutdown or regularly, so that the glue liquid and the residual glue can be cleaned in time, and solidification and blockage in the system can be avoided.

Description

Technical Field

[0001] This application relates to the field of photovoltaic panel processing technology, and in particular to a glue-applying device with a cleaning function. Background Technology

[0002] With technological advancements, solar modules will gradually adopt silicone instead of traditional adhesive films for encapsulation. Currently, the silicone encapsulation methods used domestically and internationally for solar modules include screen printing, roller coating, and slot coating.

[0003] The main working principle of the slit coating mode is as follows: The mixed silicone is placed in an intermediate mixing tank. A servo gear pump quantitatively extracts the silicone from the intermediate mixing tank and then delivers it through a high-pressure supply pipe to a distributor above the coating head. The distributor branches out four outlet pipes, evenly delivering the silicone to the inner cavity of the coating blade. The coating blade tip is a slit with an opening of only 1mm, the same width as the photovoltaic glass. The inner cavity and the blade tip are controlled by a row of electromagnetic shut-off valves. To ensure uniformity, each electromagnetic valve only controls the opening and closing of approximately 30mm of the inner cavity and blade tip. During coating, the blade tip is brought close to the photovoltaic glass. After the servo pump pressurizes the system to a certain value, all electromagnetic valves are opened simultaneously. A servo motor then drives the coating blade from one end of the glass to the other to achieve the slit coating function.

[0004] In practical use, the biggest problem with slot coating is its susceptibility to clogging. Because slot coating utilizes pumps, pipelines, solenoid valves, distributors, and intermediate mixing tanks, stagnant zones and residual adhesive can easily form within these systems. This residual two-component adhesive hardens over time, leading to system blockage and failure. If not cleaned promptly, the blockage worsens, directly impacting coating effectiveness and ultimately halting production. Therefore, improvements to existing coating equipment are urgently needed. Summary of the Invention

[0005] One objective of this application is to provide an adhesive applicator with a cleaning function that can solve at least one of the defects in the aforementioned background art.

[0006] To achieve at least one of the above objectives, the technical solution adopted in this application is as follows: a glue-applying device with a cleaning function, comprising an intermediate mixing tank, a distributor, a glue-applying blade, and an air source; the intermediate mixing tank is adapted to continuously supply glue liquid to the distributor via a glue supply pump; the distributor is vertically installed and uniformly delivers the glue liquid to the inner cavity of the glue-applying blade through a glue outlet pipe at the bottom, for the glue-applying blade to apply glue to the surface of the solar panel; the air source is connected to the distributor, and the air source is adapted to provide a high-pressure airflow to the distributor when glue application stops, so that the residual glue in the distributor, the glue outlet pipe, and the inner cavity is discharged under the action of the airflow.

[0007] Preferably, the inner cavity extends horizontally, and the bottom of the dispenser is connected to the inner cavity through multiple dispensing tubes, with the connection positions of each dispensing tube spaced apart along the extension direction of the inner cavity; wherein the connection positions of two dispensing tubes are located at the top of both ends of the inner cavity.

[0008] Preferably, the inner cavity is connected to the intermediate mixing tank via a return pipe, so that the intermediate mixing tank, the dispenser, and the inner cavity form a glue circulation loop through the connection of the glue outlet pipe and the return pipe; the glue supply pump provides power to the glue circulation loop; the air source is adapted to discharge the remaining glue from the dispenser, the glue outlet pipe, and the inner cavity into the intermediate mixing tank along the return pipe through the provided high-pressure airflow after the glue application is stopped.

[0009] Preferably, the two ends of the inner cavity are connected to the intermediate mixing tank through a return pipe.

[0010] Preferably, a filter screen is detachably installed in the middle of the dispenser, and the filter screen is adapted to filter the broken glue in the glue circulation loop.

[0011] Preferably, there are multiple dispensers, and the intermediate mixing tank is connected to multiple dispensers through a control loop. During the glue application process, the intermediate mixing tank is only connected to one of the dispensers to form the glue circulation loop. The glue circulation loop detects the clogging status of the filter screen through an installed detection component, and then the control loop controls the switching of the dispensers forming the glue circulation loop based on the detection result of the detection component.

[0012] Preferably, the detection component includes a first pressure sensor installed on the dispenser and a second pressure sensor installed on the glue applicator head; the first pressure sensor is used to detect the glue pressure inside the dispenser, and the second pressure sensor is used to detect the glue pressure inside the inner cavity, thereby determining the clogging status of the filter screen by the pressure difference detected by the two sensors.

[0013] Preferably, the control circuit includes multiple glue supply pipes, multiple glue supply electric valves, and multiple guide pipes; the glue supply pipes are correspondingly installed on the top of the distributor and connected to the intermediate mixing tank; the glue supply electric valves are correspondingly installed on the glue supply pipes, and the glue supply electric valves are also connected to the intermediate mixing tank through the guide pipes; when applying glue, the distributor connected to the glue circulation circuit is connected to the corresponding glue supply pipe through the glue supply electric valve, and at the same time, the glue supply electric valve shuts off the corresponding guide pipe; at this time, in the other distributors, the glue supply electric valve connects the glue supply pipe to the guide pipe, so that the glue does not enter the distributor and flows back to the intermediate mixing tank.

[0014] Preferably, the air source is connected to the control circuit; the air source is adapted to supply air to the distributor alone so that the adhesive in the distributor can be applied or returned; the air source is also adapted to supply air to the control circuit when the application of adhesive is stopped so that the adhesive in the control circuit can be returned to the intermediate mixing tank.

[0015] Preferably, the output end of the glue supply pump is connected to the control circuit via a control valve; each distributor is equipped with a purge air pipe on its top, and a purge air electric valve is installed on the purge air pipe; the output end of the air source is connected to the purge air pipe and the control valve respectively; the air source supplies air to the distributor through the purge air electric valve connected to the purge air pipe; the air source also supplies air to the control circuit through the connection of the control valve.

[0016] Compared with the prior art, the beneficial effects of this application are as follows:

[0017] (1) Design the distributor to be a vertical structure that allows the adhesive to flow out by its own weight, such as an inverted cone structure. This will completely eliminate the phenomenon of dead zones inside the distributor during production, and at the same time ensure that the adhesive entering the distributor can be fully discharged, thereby effectively preventing the adhesive from solidifying and clogging inside the distributor.

[0018] (2) By connecting the distributor to the air source, high-pressure gas can be used to purge and clean the distributor, its downstream pipelines, and the glue applicator head in a timely manner, thereby avoiding the solidification and blockage caused by prolonged retention in the system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention.

[0020] Figure 2 This is a schematic diagram of the distributor in this invention.

[0021] Figure 3This is a schematic diagram of the overall structure of Embodiment 2 of the present invention.

[0022] Figure 4 This is a partial schematic diagram of the glue supply operation of one of the dispensers in Embodiment 2 of the present invention.

[0023] Figure 5 This is a partial schematic diagram of another dispenser in Embodiment 2 of the present invention performing adhesive supply.

[0024] Figure 6 This is a partial schematic diagram of the purging operation in Embodiment 2 of the present invention.

[0025] In the diagram: 1. Intermediate mixing tank; 100. Solar panel; 2. Glue supply pump; 21. Control valve; 3. Glue supply electric valve; 31. Purge air pipe; 4. Purge air electric valve; 41. Air source; 5. Distributor; 6. Glue outlet pipe; 61. First pressure sensor; 62. Filter screen; 7. Glue application blade; 8. Inner cavity; 81. Manifold; 82. Blade tip; 83. Second pressure sensor; 84. Blade solenoid valve; 9. Detailed Implementation

[0026] The present application will be further described below with reference to specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0027] In the description of this application, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this application.

[0028] It should be noted that the terms "first," "second," etc., in the specification and claims of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0029] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0030] Example 1:

[0031] A glue application device with a cleaning function, such as Figure 1 As shown, the system includes an intermediate mixing tank 1, a distributor 6, an applicator head 8, and an air source 5. The intermediate mixing tank 1 is used to stir and mix the adhesive to maintain its viscosity. Located upstream of the distributor 6, the intermediate mixing tank 1 continuously supplies adhesive to the distributor 6 via an adhesive supply pump 2 installed at the outlet end. The distributor 6 is vertically installed and located upstream of the applicator head 8. The distributor 6 can evenly deliver the adhesive to the inner cavity 81 of the applicator head 8 through an outlet pipe 61 at its bottom, allowing the applicator head 8 to move and apply adhesive along the surface of the solar panel 100 under the drive of a power unit (not shown). The air source 5 is connected to the distributor 6 and can provide a high-pressure airflow to the distributor 6 when applicator application stops, causing any remaining adhesive in the distributor 6, outlet pipe 61, and inner cavity 81 to be discharged under the action of the airflow.

[0032] It should be understood that the structure of the traditional glue-applying blade 8 is as follows: Figure 1 As shown, the adhesive applicator head 8 extends horizontally, meaning it is the same width as the solar panel 100. To ensure uniform adhesive application to the solar panel 100, an inner cavity 81 is horizontally provided within the adhesive applicator head 8 along its extension direction. The bottom outlet of the distributor 6 can be connected at equal intervals along the extension direction of the adhesive applicator head 8 via multiple outlet tubes 61, allowing the adhesive in the distributor 6 to flow evenly from the top of the adhesive applicator head 8 into the inner cavity 81 through the multiple outlet tubes 61. Simultaneously, a blade 83 is provided at the bottom of the adhesive applicator head 8, and a confluence channel 82 connecting the blade 83 is provided above the blade 83 at the lower part of the adhesive applicator head 8. The confluence channel 82 is connected to the inner cavity 81 along its extension direction via multiple blade solenoid valves 9, allowing the adhesive in the inner cavity 81 to converge into the confluence channel 82 when the blade solenoid valves 9 are opened, and then flow evenly from the blade 83 and be applied to the surface of the solar panel 100.

[0033] Based on the structure of the adhesive applicator 8 described above, the following are the reasons why traditional adhesive applicators may experience clogging during adhesive application:

[0034] (1) The adhesive in the inner cavity 81 of the adhesive applicator 8 cannot be completely drained by its own weight when the machine stops. The adhesive remaining in the inner cavity 81 will be in a semi-cured and cured state, which will block the downstream solenoid valve 9 during the next production. Specifically, the solenoid valve 9 needs to control the amount of adhesive applied, and its valve core diameter is only about 2mm. If it is too large, the amount of adhesive cannot be controlled. The residual adhesive particles generated upstream of the solenoid valve 9 will block the valve hole, resulting in local lack of adhesive during the application process, which will prevent the application work from being completed, or the applied solar panel 100 will not meet the requirements.

[0035] (2) The output end of the cutter head solenoid valve 9 is connected to the manifold 82 through the glue dispensing channel. Due to the control of the glue application amount, the glue dispensing channel cannot be designed to be too large, generally only 1-2 mm wide. Thus, even if residual glue can pass through the cutter head solenoid valve 9 from upstream, it may still block the glue dispensing channel. At the same time, since the residual glue in the glue dispensing channel cannot be completely drained when the machine stops, it will also solidify in the glue dispensing channel, thus causing system blockage.

[0036] (3) The manifold 82 of the glue-applying cutter head 8 is downstream of the glue outlet channel; therefore, during the glue-applying process, the residual glue particles upstream will be gradually squeezed here. Since the downstream cutter head 83 has only a 1.2mm wide slit, the slit cannot be designed to be too wide, otherwise the amount of glue applied and the glue-applying effect cannot be controlled. As a result, the residual glue will accumulate in the manifold 82 and cause blockage.

[0037] (4) Due to the limitations of the amount and effect of the adhesive applied, the opening of the blade 83 can only be designed to be about 1.2mm. The residual adhesive squeezed out from the upstream during the adhesive application will also get stuck in the slit here, directly affecting the adhesive application effect. Although this can be dealt with by constantly stopping the machine to clean it on the outermost side, it will seriously affect the adhesive application rhythm.

[0038] (5) When the machine stops, the glue outlet tube 61 of the dispenser 6 cannot be cleaned, and the residual glue will gradually produce semi-cured and cured residue on the tube wall. The residue will gradually be squeezed into the inner cavity 81 of the glue applicator 8 and its downstream components, causing blockage.

[0039] This embodiment utilizes the principles of fluid mechanics, connecting the glue inlet end of the distributor 6 to the air source 5. Thus, when the machine is stopped or during periodic cleaning, a high-pressure airflow can be introduced into the distributor 6 by starting the air source 5. The high-pressure airflow can pass through the distributor 6, the glue outlet pipe 61, and the glue applicator 8 in sequence, thereby discharging the glue and residual glue in the distributor 6, the glue outlet pipe 61, and the glue applicator 8 along the nozzle 83 for timely cleaning, preventing the glue from solidifying and clogging due to prolonged retention inside the system.

[0040] Furthermore, in this embodiment, the dispenser 6 is installed vertically and designed so that the adhesive can flow out of the dispenser 6 by its own gravity. This includes any structure that facilitates the downward flow of fluid under its own weight, such as an inverted cone shape, but not limited to a cone shape. This ensures that no dead zones where adhesive can remain inside the dispenser 6 are created, allowing the adhesive entering the dispenser 6 through the inlet to be completely discharged through the outlet at the bottom. This effectively prevents adhesive residue from solidifying and clogging inside the dispenser 6.

[0041] This embodiment utilizes air source 5 to form an air-blowing cleaning structure to clean the adhesive from the coating device. This reduces the resistance of the coating system during operation, thereby effectively improving coating efficiency and quality. Furthermore, this embodiment's adhesive cleaning method is highly operable, easy to install on-site, and simple to maintain.

[0042] Specifically, such as Figure 1 As shown, the top inlet of the distributor 6 is vertically equipped with a glue supply pipe 3 and a purge air pipe 4; the glue supply pipe 3 is equipped with a glue supply electric valve 31, and the purge air pipe 4 is equipped with a purge air electric valve 41. The intermediate mixing tank 1 is vertically installed, and the intermediate mixing tank 1 is connected to the input end of the glue supply pump 2 through its bottom. The output end of the glue supply pump 2 is connected to the glue supply pipe 3 through pipe V3; at the same time, the air source 5 is connected to the purge air pipe 4 through pipe V4. The specific number of glue outlet pipes 61 set at the bottom outlet of the distributor 6 can be set according to actual needs, for example... Figure 1 As shown, there are four dispensing tubes 61, which are connected at intervals along the extension direction of the dispensing head 8; and in order to further reduce the dead zone in the inner cavity 81, two of the dispensing tubes 61 are connected to the top of both ends of the inner cavity 81 respectively.

[0043] To facilitate understanding, the specific working process of the adhesive application device can be described as follows: When applying adhesive to the surface of the solar panel 100, the adhesive supply pump 2 can be started to transport the adhesive in the intermediate mixing tank 1 along the pipeline V3 to the adhesive supply pipe 3. At this time, the adhesive supply electric valve 31 can open the adhesive supply pipe 3 so that the adhesive can flow smoothly into the distributor 6; then the adhesive in the distributor 6 can flow evenly into the inner cavity 81 of the adhesive application head 8 along the corresponding adhesive outlet pipe 61 for uniformly applying adhesive to the surface of the solar panel 100. At this time, the air source 5 is in a stopped state, and the air blowing electric valve 41 cuts off the purge air pipe 4.

[0044] When applying adhesive to the solar panel 100 or performing periodic cleaning, the adhesive supply pump 2 is stopped and the adhesive supply pipe 3 is shut off via the adhesive supply electric valve 31. Simultaneously, the purge air pipe 4 is opened via the purge air electric valve 41, and the air source 5 is activated. The air source 5 then supplies high-pressure airflow into the distributor 6 through the opened purge air pipe 4. This high-pressure airflow then passes through the distributor 6 and the downstream adhesive flow path, discharging and cleaning any remaining adhesive and residue within the distributor 6 and the adhesive flow path.

[0045] It should be noted that the intermediate mixing tank 1 needs to have a quick-disassembly and cleaning structure, so that after each processing, the intermediate mixing tank 1 needs to be disassembled and its internal residual adhesive cleaned to prevent the adhesive from curing inside the tank and being discharged downstream by the adhesive supply pump 2, thus clogging the system. The displacement of the adhesive supply pump 2 needs to meet the adhesive supply volume at the fastest cycle time of the system design, that is, the speed of the adhesive supply pump 2 is adjustable. The diameter of the adhesive supply pipe 3 needs to meet the adhesive supply requirements and its strength can withstand the working pressure and burst pressure. The diameter of the adhesive outlet pipe 61 needs to ensure that the adhesive can flow out smoothly, avoiding residual adhesive blockage, and its strength can withstand the working pressure and burst pressure. The adhesive supply electric valve 31 and the air blowing electric valve 41 can effectively cut off and open the adhesive supply pipe 3 and the air blowing pipe 4 at any time, and the adhesive supply electric valve 31 and the air blowing electric valve 41 also need to be able to withstand the working pressure and burst pressure. Generally speaking, the working pressure is 16MPa and the burst pressure is 32MPa.

[0046] It should also be noted that the specific structure and working principle of the gas source 5 are well known to those skilled in the art. The gas source medium provided by the gas source 5 can be compressed air, or an inert gas or other gas that does not react with the adhesive, such as nitrogen. In order to ensure that the adhesive can be smoothly discharged by the airflow, the gas source 5 needs to have a certain pressure, such as bottled nitrogen at 12.5 MPa.

[0047] In this embodiment, as Figure 1 As shown, the inner cavity 81 is connected to the intermediate mixing tank 1 via a return pipe, forming a glue circulation loop between the intermediate mixing tank 1, the distributor 6, and the inner cavity 81 through the connection of the glue outlet pipe 61 and the return pipe. During glue application, the glue supply pump 2 provides power to the glue circulation loop to achieve glue circulation. After glue application stops, the air source 5 can provide high-pressure airflow to discharge the remaining glue from the distributor 6, the glue outlet pipe 61, and the inner cavity 81 back into the intermediate mixing tank 1 via the return pipe.

[0048] It should be understood that the adhesive in the dispenser 6 enters the inner cavity 81 of the coating blade 8 at multiple points through multiple dispensing pipes 61; simultaneously, the adhesive in the inner cavity 81 also flows out through multiple points along the solenoid valves 9 of each blade. Therefore, dead zones where adhesive residue may still exist in the inner cavity 81. In this embodiment, the inner cavity 81 is connected to the intermediate mixing tank 1 through a return pipe, which allows the adhesive in the inner cavity 81 to have multiple outflow paths, thereby effectively reducing the probability of dead zones appearing in the inner cavity 81.

[0049] Specifically, during normal glue application, the normal circulation of the glue in the glue circulation loop increases the fluidity of the glue within the inner cavity 81, reducing or preventing localized areas of stagnant glue. However, during shutdown or periodic cleaning, due to the multi-point flow structure of the inner cavity 81 and the relatively narrow conduction path of the cutter head solenoid valve 9, the residual glue within the inner cavity 81 exhibits poor fluidity under high-pressure airflow, easily leading to localized residue. By incorporating a return pipe, the fluidity of residual glue within the inner cavity 81 can be effectively increased, reducing or preventing localized glue residue and significantly shortening the cleaning time.

[0050] Specifically, there are various possibilities regarding the number and installation location of the return pipes. Considering the horizontal extension structure of the inner cavity 81, one preferred installation method is as follows: Figure 1 As shown, the two ends of the inner cavity 81 are connected to the intermediate mixing tank 1 through return pipes V1 and V2, respectively. The return pipes V1 and V2, symmetrical to the inner cavity 81, ensure stable pressure inside the inner cavity 81 during adhesive circulation and residual adhesive cleaning, thus preventing any impact on the uniformity of adhesive application and accelerating the adhesive cleaning process and improving cleaning quality.

[0051] In this embodiment, as Figure 1 and Figure 2 As shown, a filter screen 7 is detachably installed in the middle of the dispenser 6. The filter screen 7 can filter the broken glue in the glue circulation loop.

[0052] It should be understood that, as mentioned above, during shutdown or periodic cleaning, the glue supply pump 2 is in the off state, and the glue supply electric valve 31 simultaneously shuts off the glue supply pipe 3. The air source 5 can only clean residual glue from the distributor 6 and its downstream components, but cannot clean residual glue from the glue supply pipe 3, the upstream pipe V3, or the glue supply pump 2. Therefore, during the next glue application process, the glue supply pump 2 will transport itself, along with the cured residual glue from pipe V3 and the glue supply pipe 3, into the distributor 6, potentially causing blockage downstream of the distributor 6.

[0053] In this embodiment, by setting a filter screen 7 in the distributor 6, the cured residual glue in the glue supply pump 2, pipeline V3 and glue supply pipe 3 can be intercepted and filtered during the glue coating process, so as to ensure that no residual glue particles appear in the glue flowing into the glue outlet pipe 61 and downstream, thereby ensuring the stable progress of the glue coating process.

[0054] It should also be noted that installing the filter screen 7 in the middle of the distributor 6 ensures that the adhesive in the adhesive supply tube 3 can smoothly enter the distributor 6. Furthermore, the filter screen 7 needs to have a certain strength, and its mesh size should be as small as possible while ensuring that normal adhesive can pass through smoothly, generally around 200 mesh.

[0055] Example 2:

[0056] like Figures 3 to 6 As shown, the difference between this embodiment and Embodiment 1 is that there are multiple dispensers 6, and the intermediate mixing tank 1 is connected to multiple dispensers 6 through a control circuit. During the glue application process, the intermediate mixing tank 1 is only connected to one of the dispensers 6 to form a glue circulation loop. The glue circulation loop detects the clogging status of the filter screen 7 using an installed detection component, and the control circuit controls the switching of the dispensers 6 forming the glue circulation loop based on the detection results of the detection component.

[0057] It should be understood that in Embodiment 1, there is only one distributor 6. As the adhesive coating process continues, the amount of residual adhesive particles intercepted on the filter screen 7 in the distributor 6 will gradually increase. With the increase in residual adhesive particles, the flowability and pressure of the filter screen 7 for the normal adhesive solution will gradually decrease, which may lead to insufficient flow and pressure of the adhesive solution in the coating head 8, preventing proper coating. In Embodiment 1, replacing or cleaning the clogged filter screen 7 requires shutting down the entire adhesive coating device and opening the flange on top of the distributor 6 to remove the internal filter screen 7. This will inevitably reduce the adhesive coating efficiency of the solar panel 100 and also pose a risk of adhesive curing to the coating system.

[0058] In this embodiment, multiple distributors 6 are provided. During the adhesive application process, only one distributor 6 is connected to the adhesive circulation loop for filtration and circulation; the remaining distributors 6 are in standby mode. When the filter 7 of a working distributor 6 becomes clogged, another distributor 6 can be connected to the adhesive circulation loop via a control circuit to ensure the normal operation of the adhesive application. Simultaneously, the distributor 6 with the clogged filter 7 will be isolated from the adhesive circulation loop. Subsequently, the operator can replace or clean the clogged filter 7 without interfering with the adhesive application process, ensuring its smooth operation. This improves adhesive application efficiency and effectively avoids the risk of adhesive curing due to system downtime.

[0059] In this embodiment, there are several methods for detecting the clogging of the filter screen 7 inside the distributor 6, including but not limited to the two described below. The first method involves detecting the pressure of the distributor 6 and the glue applicator 8, and determining the clogging status of the filter screen 7 by measuring the change in the pressure difference between the distributor 6 and the glue applicator 8. The second method involves detecting the flow rate of the glue outlet pipe 61, and determining the clogging status of the filter screen 7 by measuring the change in the flow rate of the glue outlet pipe 61. Both methods can meet the usage requirements of this embodiment. For ease of understanding, the first method will be described in detail below.

[0060] Specifically, such as Figure 3 As shown, the detection assembly includes a first pressure sensor 62 mounted on the top of the dispenser 6 and a second pressure sensor 84 mounted on the top of the adhesive applicator 8. The first pressure sensor 62 is used to detect the adhesive pressure on the upper part of the filter screen 7 inside the dispenser 6, and the second pressure sensor 84 is used to detect the adhesive pressure inside the inner cavity 81. The clogging status of the filter screen 7 is determined by the pressure difference detected by the two sensors.

[0061] It is understandable that when the filter screen 7 is not clogged, the adhesive in the distributor 6 located above the filter screen 7 can pass smoothly through the filter screen 7. Therefore, with the adhesive flow rate supplied by the adhesive supply tube 3 remaining constant, the pressure of the adhesive in the distributor 6 can be considered uniform and constant. Consequently, the pressure of the adhesive in the inner cavity 81 of the applicator head 8 is also uniform and constant, and the pressure difference between the two is constant. However, as residual particles are intercepted by the filter screen 7, the adhesive in the distributor 6 located above the filter screen 7 will not be able to pass through the filter screen 7 in time. This will cause the adhesive pressure in the upper part of the distributor 6 to increase, meaning the pressure value detected by the first pressure sensor 62 will increase. Simultaneously, the flow rate of the adhesive in the lower part of the distributor 6 will decrease, causing the adhesive pressure in the inner cavity 81 of the applicator head 8 to decrease, meaning the pressure value detected by the second pressure sensor 84 will decrease. Therefore, the pressure difference between the first pressure sensor 62 and the second pressure sensor 84 will gradually increase until the pressure difference exceeds a set threshold, at which point the filter screen 7 can be considered clogged. Subsequently, the control module (not shown) within the adhesive application system can send a switching signal to the control loop, causing the control loop to switch the new distributor 6 into the adhesive circulation system and isolate the distributor 6 clogged by the filter screen 7 from the adhesive circulation system.

[0062] It should be understood that the specific number of dispensers 6 can be determined according to the actual needs of those skilled in the art. Generally speaking, the process of the filter screen 7 intercepting residual adhesive particles until it becomes clogged takes a relatively long time, which can basically meet the needs of the filter screen 7 replacement or cleaning process; therefore, in this embodiment, such as Figures 3 to 6 As shown, the number of distributors 6 is preferably 2.

[0063] In this embodiment, as Figures 3 to 5As shown, the control circuit includes a glue supply pipe 3 installed on top of multiple distributors 6 and a corresponding glue supply electric valve 31, as well as a guide pipe connecting the glue supply electric valve 31 and the intermediate mixing tank 1. During glue application, the distributor 6 connected to the glue circulation circuit is connected to the corresponding glue supply pipe 3 via the glue supply electric valve 31, while the glue supply electric valve 31 simultaneously shuts off the corresponding guide pipe. Thus, the glue supply pump 2 can transport the glue from the intermediate mixing tank 1 along the glue supply pipe 3 to the distributor 6 for downstream glue application head 8 to apply glue to the solar panel 100. At this time, in the other distributors 6, the glue supply electric valve 31 connects the glue supply pipe 3 to the guide pipe, so that the glue supplied by the glue supply pump 2 does not enter the distributor 6 but can flow back to the intermediate mixing tank 1 through the guide pipe. Therefore, when switching distributors 6 later, the switched distributor 6 can immediately inject glue through the connection of the corresponding glue supply electric valve 31, thus avoiding interruption of the glue application process due to insufficient glue in the glue application head 8 during the switching process.

[0064] It should be understood that during normal glue application, if glue pump 2 only supplies glue to distributor 6 connected to the glue circulation loop, and the glue supply pipes 3 corresponding to the other distributors 6 are not connected to glue pump 2, then after switching distributors 6, glue pump 2 needs to deliver glue along the corresponding pipe V3 to the switched distributor 6. During the time the glue flows along pipe V3, the inner cavity 81 corresponding to the glue application head 8 will not be replenished with glue, which may cause the glue application head 8 to stop applying glue due to insufficient glue.

[0065] In this embodiment, while supplying adhesive to the distributor 6 connected to the adhesive circulation loop, the adhesive pump 2 can also supply adhesive to the corresponding adhesive supply pipes 3 of the other distributors 6 and return it to the intermediate mixing tank 1 through the guide pipe. Thus, after the distributor 6 is switched, the adhesive in the pipe V3 can immediately enter the switched distributor 6 through the immediate opening of the corresponding adhesive supply pipe 3 on the switched distributor 6, thereby replenishing the adhesive in the inner cavity 81 of the adhesive applicator 8 and ensuring the smooth progress of the adhesive application.

[0066] Meanwhile, for the isolated dispenser 6, the glue pump 2 can circulate the glue back to the intermediate mixing tank 1 along the corresponding glue supply pipe 3 and guide pipe to ensure that the glue does not solidify in the corresponding pipeline. Furthermore, after the filter screen 7 is replaced or cleaned, it allows for immediate glue injection when the dispenser 6 is switched back to its original configuration.

[0067] It is understandable that the glue supply pipe 3 is installed on the flange at the top of the distributor 6. When replacing or cleaning the filter screen 7, the flange needs to be disassembled, but this will not affect the glue supply pipe 3 on it from circulating back the glue.

[0068] In this embodiment, as Figures 4 to 6 As shown, air source 5 is connected to the control circuit. Air source 5 can supply air to distributor 6 independently, so that the adhesive in distributor 6 can be applied or returned. Air source 5 can also supply air to the control circuit when application is stopped, so that the adhesive in the control circuit can be returned to intermediate mixing tank 1.

[0069] It should be noted that when replacing or cleaning the filter 7 in the isolated distributor 6, the adhesive in the distributor 6 must first be drained. Because the filter 7 is clogged, the adhesive's flowability is poor. Therefore, to improve the adhesive drainage efficiency, the air source 5 can be controlled to supply air only to the isolated distributor 6, so that the adhesive in the isolated distributor 6 can be quickly squeezed into the inner cavity 81 of the applicator head 8. A small portion of the adhesive squeezed into the inner cavity 81 can be used for applicator application, while most will flow back to the intermediate mixing tank 1 through the return pipes V1 and V2.

[0070] Meanwhile, during shutdown or periodic cleaning, due to the shutdown of the glue supply pump 2, glue residue remains in the corresponding pipeline V3 and guide pipe of the control circuit, meaning there is undischarged glue residue in the control circuit. At this time, the air source 5, while supplying air to the distributor 6, can also supply air to the entire control circuit. Under the action of high-pressure airflow, the residual glue residue in pipeline V3 and guide pipe can be returned to the intermediate mixing tank 1.

[0071] In this embodiment, there are multiple piping structures for supplying gas from gas source 5 to distributor 6 individually and to the entire control loop. One such structure is as follows: Figures 3 to 6 As shown, the output end of the glue supply pump 2 is connected to the control circuit through the control valve 21, that is, the glue supply pump 2 is connected to the pipeline V3 through the control valve 21 installed at the output end. The output end of the air source 5 is connected to the purge air pipe 4 installed on the top of each distributor 6 and the control valve 21 through the pipeline V4.

[0072] When air needs to be supplied to a distributor 6 individually, the purge air pipe 41 installed on the top of the distributor 6 can connect the purge air pipe 4 to the distributor 6. Then, after startup, the air source 5 can supply high-pressure airflow to the corresponding distributor 6 through pipe V4. When air needs to be supplied to the entire control circuit, the control valve 21 can connect pipe V4 to pipe V3. Then, after startup, the air source 5 can supply high-pressure airflow to pipe V3 through pipe V4. The high-pressure airflow then flows along the guide pipe to the intermediate mixing tank 1 after passing through the glue supply pipe 3 on the top of each distributor 6, thereby returning the residual glue in the entire control circuit to the intermediate mixing tank 1.

[0073] For ease of understanding, the switching process will be described in detail below using two distributors 6. For easy distinction, the two distributors 6 are defined as the left distributor and the right distributor according to their left and right positions, respectively.

[0074] like Figures 4 to 6 As shown, the control valve 21 installed at the output end of the glue supply pump 2 is connected to the glue supply pipes 3 on the top of the left and right distributors via pipe V3; the air source 5 is connected to the purge air pipes 4 on the top of the left and right distributors and the control valve 21 via pipe V4. The glue supply electric valve 31 installed on the glue supply pipe 3 on the top of the left distributor is connected to the intermediate mixing tank 1 via guide pipe V5; the glue supply electric valve 31 installed on the glue supply pipe 3 on the top of the right distributor is connected to the intermediate mixing tank 1 via guide pipe V6.

[0075] When the left dispenser is connected to the adhesive circulation loop, such as Figure 4 As shown, control valve 21 connects the glue supply pump 2 to pipeline V3; the glue supply pipe 3 at the top of the left distributor is connected to the left distributor under the control of the glue supply electric valve 31, while the guide pipe V5 is shut off by the glue supply electric valve 31; this allows the glue delivered by the glue supply pump 2 to enter the left distributor for downstream glue application head 8 to apply glue to the surface of the solar panel 100. Simultaneously, the glue supply electric valve 31 at the top of the right distributor connects pipeline V3 to guide pipe V6, allowing the glue delivered by the glue supply pump 2 to the glue supply pipe 3 at the top of the right distributor to flow back to the intermediate mixing tank 1 along guide pipe V6. At this time, control valve 21 shuts off pipeline V4 from pipeline V3, and the air blowing electric valves 41 at the top of both the left and right distributors are closed.

[0076] When the filter 7 in the left distributor is clogged and the right distributor is switched on, such as Figure 5 As shown, control valve 21 maintains the connection between glue pump 2 and pipeline V3, while simultaneously connecting glue supply pipe 3 at the top of the left distributor to guide pipe V5 via glue supply electric valve 31 at the top of the left distributor. This allows the glue delivered by glue pump 2 to glue supply pipe 3 at the top of the left distributor to flow back to the intermediate mixing tank 1 along guide pipe V6. At the same time, glue supply electric valve 31 at the top of the right distributor connects the right distributor to pipeline V3, allowing the glue delivered by glue pump 2 to enter the right distributor for downstream coating head 8 to coat the surface of the solar panel 100. At this time, the air blowing electric valve 41 on the top of the left distributor connects the left distributor to the pipeline V4, while the control valve 21 keeps the pipeline V4 and pipeline V3 closed, and the air blowing electric valve 41 on the top of the right distributor remains closed; then the air source 5 can introduce high-pressure airflow into the left distributor after startup, and then the adhesive in the left distributor flows back to the intermediate mixing tank 1 through the inner cavity 81 and along the return pipes V1 and V3.

[0077] When shutdown or periodic cleaning is required, such as Figure 6 As shown, the glue supply pump 2 stops, and control valve 21 connects pipeline V4 and pipeline V3. The glue supply electric valves 31 on the top of the left and right distributors connect the corresponding glue supply pipes 3 to the guide pipes V5 and V6 respectively, and shut off the left and right distributors from the corresponding glue supply pipes 3. At the same time, the air blowing electric valves 41 on the top of the left and right distributors control the corresponding purge air pipes 4 to connect the left and right distributors to pipeline V4 respectively. Thus, after the air source 5 is started, high-pressure airflow can be introduced into the left and right distributors and pipeline V3 through pipeline V4, and then the glue in the left and right distributors flows back to the intermediate mixing tank 1 through the inner cavity 81 and along the return pipes V1 and V2; at the same time, the glue in pipeline V3, guide pipes V5 and V6 also flows back to the intermediate mixing tank 1.

[0078] It should be noted that during shutdown or periodic cleaning, if there are clean, unused distributors 6, high-pressure airflow does not need to be introduced. Furthermore, the dispensing pipes 61 at the bottom of the left and right distributors share a common connection point on the dispensing head 8; and the dispensing pipes 61 at the bottom of the left and right distributors can be isolated using a one-way valve or other valve capable of pipeline control to prevent adhesive from seeping into distributors 6 that are not connected to the adhesive circulation loop.

[0079] In this application, the specific structure and working principle of the control valve 21, the glue supply electric valve 31, and the air blowing electric valve 41 are known to those skilled in the art; those skilled in the art can purchase and use them according to actual needs.

[0080] The basic principles, main features, and advantages of this application have been described above. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this application. Various changes and modifications can be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection claimed by this application is defined by the appended claims and their equivalents.

Claims

1. A glue-applying device with a cleaning function, characterized in that, include: An intermediate mixing tank; the intermediate mixing tank is adapted to continuously supply adhesive to a distributor via an adhesive supply pump; Distributor; The dispenser is installed vertically and delivers the adhesive evenly into the inner cavity of the applicator head through the dispensing tube at the bottom. Glue-applying blade; The adhesive applicator applies adhesive to the surface of the solar panel through the adhesive liquid inside the cavity; and An air source; the air source is connected to the distributor; the air source is adapted to provide a high-pressure airflow into the distributor when the glue application stops, so that the distributor, the glue outlet tube and the residual glue in the inner cavity are discharged under the action of the airflow; The inner cavity is connected to the intermediate mixing tank via a return pipe, so that the intermediate mixing tank, the distributor, and the inner cavity form a glue circulation loop through the connection of the glue outlet pipe and the return pipe; the glue supply pump provides power to the glue circulation loop; the air source is adapted to discharge the remaining glue from the distributor, the glue outlet pipe, and the inner cavity into the intermediate mixing tank along the return pipe by providing airflow after the glue application is stopped; A filter screen is detachably installed in the middle of the dispenser, and the filter screen is suitable for filtering the broken glue in the glue circulation loop; There are multiple dispensers, and the intermediate mixing tank is connected to multiple dispensers through a control loop. During the glue application process, the intermediate mixing tank is only connected to one of the dispensers to form the glue circulation loop. The adhesive circulation loop detects the clogging status of the filter screen through an installed detection component, and then the control loop controls the switching of the distributor that forms the adhesive circulation loop based on the detection result of the detection component. The control circuit includes multiple glue supply pipes, multiple glue supply electric valves, and multiple guide pipes; the glue supply pipes are installed on the top of the distributor and connected to the intermediate mixing tank; the glue supply electric valves are installed on the glue supply pipes and are also connected to the intermediate mixing tank through the guide pipes. During the application of adhesive, the distributor connected to the adhesive circulation loop is connected to the corresponding adhesive supply pipe through the adhesive supply electric valve, and at the same time the adhesive supply electric valve cuts off the corresponding guide pipe. At this time, in the remaining distributors, the glue supply electric valve connects the glue supply pipe to the guide pipe so that the glue does not enter the distributor and flows back to the intermediate mixing tank. The air source is connected to the control circuit; the air source is adapted to supply air to the distributor alone so that the adhesive in the distributor can be applied or returned; the air source is also adapted to supply air to the control circuit when the application of adhesive is stopped so that the adhesive in the control circuit can be returned to the intermediate mixing tank.

2. The adhesive applicator with cleaning function as described in claim 1, characterized in that: The inner cavity extends horizontally, and the bottom of the dispenser is connected to the inner cavity through multiple dispensing tubes, with the connection positions of each dispensing tube spaced apart along the extension direction of the inner cavity; wherein the connection positions of two dispensing tubes are located at the top of both ends of the inner cavity.

3. The adhesive applicator with cleaning function as described in claim 2, characterized in that: The two ends of the inner cavity are connected to the intermediate mixing tank via reflux pipes.

4. The adhesive applicator with cleaning function as described in claim 1, characterized in that: The detection component includes a first pressure sensor installed on the dispenser and a second pressure sensor installed on the glue applicator head; the first pressure sensor is used to detect the glue pressure inside the dispenser, and the second pressure sensor is used to detect the glue pressure inside the inner cavity, thereby determining the clogging status of the filter screen by the pressure difference detected by the two sensors.

5. The adhesive applicator with cleaning function as described in claim 1, characterized in that: The output end of the glue supply pump is connected to the control circuit through a control valve; each distributor is equipped with a purge air pipe on its top, and a purge air electric valve is installed on the purge air pipe; the output end of the air source is connected to the purge air pipe and the control valve respectively; the air source supplies air to the distributor through the purge air electric valve connected to the purge air pipe; the air source also supplies air to the control circuit through the connection of the control valve.

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