Electromagnetic shielding method and processing system for laser-guided conductive adhesive sealing

Abstract

The application discloses a kind of electromagnetic shielding method and processing system of laser guiding conductive glue sealing, the processing system includes: workpiece (1), fixed clamp (2), conductive glue (3), injector (4), mechanical arm (5), laser coupler (6), laser beam (7), moving platform (8), non-contact temperature sensor (9), industrial computer (10), reflected light receiver (11), hair dryer (12), dark paint (13), the feedback signal of temperature sensor and reflected light receiver is adjusted the output power of laser by industrial computer, to guide the flow trajectory of conductive glue, simultaneously, the adjustable nature of temperature of laser and hair dryer are realized the rapid cooling solidification of conductive glue, accurately fill the conductive glue in thin-walled, small gap and other difficult airtight precision structure, improve the reliability and anti-interference ability of structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic shielding, in particular to a laser-guided conductive glue sealing electromagnetic shielding method and processing system. BACKGROUND

[0002] The main method of electromagnetic shielding at present includes using shielding materials, joints and contacts, conductive pads and other methods to fill or wrap the electromagnetic leakage parts, and using the shielding materials to realize shielding effect by absorbing or reflecting electromagnetic waves. However, with the development of science and technology, more and more high-precision weapons and equipment are gradually developing towards lightweight and miniaturization in order to pursue higher stability and quality, which leads to more and more thin-walled and small-gap structures that need electromagnetic shielding protection. It is difficult for conventional shielding methods to complete the arrangement and implementation in such an environment.

[0003] As a liquid, conductive glue has the characteristics of strong viscosity and flowability compared with common metal and conductive rubber shielding materials. It can adapt to the filling of various shaped gaps by changing its form, and does not occupy extra space. However, the characteristics of conductive glue also make it difficult to control. How to make it follow the planned route and fill the specified gap quickly after solidification without affecting the extra area is a difficulty in using conductive glue.

[0004] Laser has the characteristics of high precision, fast heating, small heat-affected zone and easy adjustment. It can control the heating temperature and area by non-contact method, change the flowability of conductive glue and make it flow along a specific trajectory, and realize the rapid cooling and solidification of conductive glue by adjusting the temperature, so as to realize the filling of electromagnetic leakage area by conductive glue. SUMMARY

[0005] The present application aims to provide a laser-guided conductive glue sealing electromagnetic shielding method and processing system to solve the problem of electromagnetic leakage of thin-walled, small-gap and other difficult-to-seal precision mechanisms.

[0006] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0007] In the first aspect, the present application provides a laser-guided conductive glue sealing electromagnetic shielding method applied to thin-walled and small-gap precision structures, which includes the following steps:

[0008] Step S1, fixing the workpiece: fixing the workpiece on the fixing clamp, preparing for conductive glue sealing electromagnetic shielding;

[0009] Step S2, syringe control: the electrically conductive adhesive is sucked by the syringe, and the movement of the syringe to the specified position is controlled by the mechanical arm. After the syringe reaches the specified position, the syringe is controlled by the mechanical arm to spray the electrically conductive adhesive to the gap to be filled. When it is necessary to stop, the syringe is stopped by the mechanical arm.

[0010] Step S3, laser coupler control: after the syringe moves to the position, the position and attitude of the laser coupler are controlled by the moving platform, so that the laser beam emitted by the laser coupler accurately irradiates the surface adjacent to the gap to be filled in the workpiece, and irradiates the surface of the workpiece along the predetermined track and power to heat the surface of the workpiece to reach the optimal temperature for promoting the flow of the electrically conductive adhesive. The heat-conducting adhesive flows along the preset track under the guidance of the laser to fill the gap to be filled in the workpiece.

[0011] Step S4, cooling and solidification: when the filling completion signal is received, the industrial computer starts the cooling module to quickly evaporate the water in the electrically conductive adhesive, so that the electrically conductive adhesive quickly solidifies to form an electromagnetic shield.

[0012] In some embodiments, the laser coupler control process further includes real-time adjustment of the power of the laser coupler by the industrial computer according to the temperature and electrically conductive adhesive state information collected by the information collection module, so that the surface temperature irradiated by the laser beam can improve the flowability of the electrically conductive adhesive.

[0013] In some embodiments, the information collection module includes a non-contact temperature sensor and a reflected light receiver.

[0014] In some embodiments, the filling completion signal received by the industrial computer is a signal indicating that the mechanical arm and the laser coupler have completed the predetermined action.

[0015] In some embodiments, when the workpiece is a transparent material, the method further includes applying dark paint to the position of the workpiece where the electrically conductive adhesive is to be applied.

[0016] In some embodiments, the syringe is an adjustable syringe with adjustable injection port diameter.

[0017] In some embodiments, the moving platform has vertical, horizontal and rotating functions.

[0018] In some embodiments, starting the cooling module includes starting a hair dryer and adjusting the power of the laser coupler to adjust the energy and size of the laser beam.

[0019] In the second aspect, the application provides a processing system for processing electromagnetic shielding sealed by conductive adhesive, comprising a fixing clamp, a syringe, a mechanical arm, a laser coupler, a moving platform, a non-contact temperature sensor, an industrial computer, a reflected light receiver and a hair dryer, wherein the mechanical arm, the moving platform, the non-contact temperature sensor, the reflected light receiver and the hair dryer are electrically connected with the industrial computer; the syringe is installed on the mechanical arm, and the laser coupler is installed on the moving platform.

[0020] In some embodiments, when the workpiece is made of transparent material, the dark paint is applied to the position where the conductive adhesive is needed.

[0021] Compared with the prior art, the application has the following beneficial effects:

[0022] The laser-guided conductive adhesive sealing electromagnetic shielding method provided by the application can adjust the flow rate of the conductive adhesive by heating the local area with a laser, and then adjust the output power of the laser through the feedback signals of the temperature and the reflected light, so that the conductive adhesive can be precisely filled and coated in the thin-walled, small-gap and other difficult-to-seal precision structures in a manner that hardly affects other parts, which is of great significance to improving the anti-interference ability of the precision structure. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A laser-guided conductive adhesive sealing electromagnetic shielding method provided by the application is shown in the embodiment.

[0024] 1, workpiece; 2, fixing clamp; 3, conductive adhesive; 4, syringe; 5, mechanical arm; 6, laser coupler; 7, laser beam; 8, moving platform; 9, non-contact temperature sensor; 10, industrial computer; 11, reflected light receiver; 12, hair dryer; 13, dark paint. DETAILED DESCRIPTION

[0025] In the following, example embodiments will be described more fully with reference to the accompanying drawings, in which example embodiments can, however, be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided as a full and enabling disclosure of the application, and to fully convey the scope of the application to the skilled person.

[0026] The embodiments of the application and the features in the embodiments can be combined with each other without conflict.

[0027] As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0029] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0030] In order to realize electromagnetic shielding of thin-walled, small-gap precision mechanisms, an embodiment of the present application provides a laser-guided conductive glue sealing electromagnetic shielding method and processing system. In order to enable those skilled in the art to better understand the technical solutions, a laser-guided conductive glue sealing electromagnetic shielding method and processing system provided by the present application are described in detail below with reference to the accompanying drawings.

[0031] As shown in Figure 1 The present application provides a laser-guided conductive glue sealing electromagnetic shielding method, which is applied to thin-walled, small-gap precision structures, and includes the following steps:

[0032] Step S1, fixing the workpiece: fixing the workpiece 1 on the fixing clamp 2, preparing to seal and shield electromagnetically by the conductive glue 3;

[0033] When the weak workpiece 1 is made of transparent material, that is, when the workpiece is a transparent workpiece, the method further includes applying dark paint 13 to the position of the workpiece 1 where the conductive glue is needed, that is, applying dark paint to the glue application site. The dark paint should not affect the bonding effect of the conductive glue.

[0034] Step S2, syringe control: the syringe 4 is used to suck the conductive glue 3, and the movement of the syringe 4 is controlled by the mechanical arm 5 to the specified position, then the syringe 4 is controlled by the mechanical arm 5 to act, and the conductive glue 3 is sprayed to the gap to be filled, and when it is needed to stop, the syringe 4 is controlled by the mechanical arm 5 to stop spraying glue; that is, the movement and action of the syringe 4 are controlled by the mechanical arm 5, the syringe 4 is moved to the specified position, and the syringe 4 is opposite to the gap to be filled of the workpiece 1; then the action of the syringe 4 is controlled to spray or stop the conductive glue. In this embodiment, the syringe 4 is an adjustable syringe with adjustable injection port diameter, which is used to suck the conductive glue, and then the syringe 4 reaches the specified position by the control of the mechanical arm 5, and the spraying and stopping of the conductive glue are controlled.

[0035] Step S3, laser coupler control: when the syringe 4 moves to the position, the position and posture of the laser coupler 6 are controlled by the moving platform 8, so that the laser beam 7 emitted by the laser coupler 6 accurately irradiates on the surface adjacent to the gap to be filled of the workpiece 1, and irradiates on the surface of the workpiece 1 along the predetermined track and power to heat the surface of the workpiece 1 to reach the optimal temperature for promoting the flow of the conductive glue 3, and the conductive glue 3 flows along the preset track under the guidance of the laser to fill the gap to be filled of the workpiece 1; in this embodiment, the moving platform 8 has vertical, horizontal and rotating functions, that is, the laser beam 7 emitted by the laser coupler 6 accurately irradiates on the surface adjacent to the gap to be filled of the workpiece 1 by using the moving platform 8 with vertical, horizontal and rotating functions, and the surface of the workpiece 1 is heated to reach the optimal temperature for promoting the flow of the conductive glue, so that the flow track of the conductive glue is guided by the laser, and the state of the conductive glue can be judged according to the reflection of the laser passing through the conductive glue.

[0036] In the process of laser coupler control, the information acquisition module is used to collect the temperature and the state of the conductive glue, and the power of the laser coupler 6 is adjusted in real time by the industrial computer 10 to control the temperature of the surface irradiated by the laser beam 7 to improve the flowability of the conductive glue; wherein the information acquisition module includes a non-contact temperature sensor 9 and a reflected light receiver 11, the non-contact temperature sensor 9 is used to measure the temperature of the surface of the workpiece 1 irradiated by the laser beam 7 in real time, and the reflected light receiver 11 is used to receive the light reflected by the laser passing through the conductive glue, and the reflected light can judge the state of the conductive glue, that is, the temperature of the surface of the workpiece 1 and the state of the conductive glue are received by the non-contact temperature sensor 9 and the reflected light receiver 11.

[0037] Step S4, cooling and solidification: when receiving the filling completion signal, the industrial computer 10 starts the cooling module, quickly evaporates the water in the conductive glue, and makes the conductive glue quickly solidify to form an electromagnetic shield. Further, starting the cooling module includes starting the air blower 12 and adjusting the power of the laser coupler 6 to adjust the energy and size of the laser beam 7. That is, then the mechanical arm 5, the laser coupler 6, the non-contact temperature sensor 9, the reflected light receiver 11 and the air blower 12 are connected with the industrial computer, the feedback signals of the non-contact temperature sensor 9 and the reflected light receiver 11 are received by the industrial computer 10 to control the output actions and power of the mechanical arm 5 and the laser coupler 6, and finally the conductive glue 3 is added, and then the industrial computer 10 controls the laser coupler 6 and the air blower 12 to quickly cool the conductive glue, so as to realize the sealing of the structure.

[0038] Specifically, the filling completion signal received by the industrial computer 10 is a signal that the mechanical arm 5 and the laser coupler 6 complete the predetermined action.

[0039] The electromagnetic shielding method for laser-guided conductive glue sealing provided by the application adjusts the flow rate of the conductive glue by using laser heating of a local area, and then adjusts the output power of the laser through the feedback signals of the temperature and the reflected light, so as to realize the precise filling and coating of the conductive glue in the thin-walled, small-gap and other difficult-to-seal precision structures in a manner that hardly affects other parts according to the predetermined trajectory, which has important significance for improving the anti-interference ability of the precision structure.

[0040] The application also provides a processing system for processing an electromagnetic shield sealed by conductive glue, which comprises a fixing clamp 2, a syringe 4, a mechanical arm 5, a laser coupler 6, a moving platform 8, a non-contact temperature sensor 9, an industrial computer 10, a reflected light receiver 11 and an air blower 12, wherein: the mechanical arm 5, the moving platform 8, the non-contact temperature sensor 9, the reflected light receiver 11 and the air blower 12 are electrically connected with the industrial computer 10; the syringe 4 is installed on the mechanical arm 5, and the laser coupler 6 is installed on the moving platform 8.

[0041] When the workpiece 1 is made of transparent material, the dark paint 13 is applied to the position where the conductive glue is needed.

[0042] Specific operation method: the workpiece 1 is installed on the fixed clamp 2, if the workpiece is transparent material, the dark paint 13 needs to be painted in the place where the conductive glue 3 is needed to be added in advance; the conductive glue 3 is sucked into the syringe 4, the syringe 4 has multiple injection ports to change the diameter of the injected liquid; the syringe 4 is installed on the operation end of the mechanical arm 5, the mechanical arm 5 can adjust the spatial position and pose of the syringe 4, and can drive the syringe 4 to inject the conductive glue 3 at different flow rates and diameters, the mechanical arm 5 is connected with the industrial computer 10, the movement of the mechanical arm 5 can be controlled through the industrial computer 10, the industrial computer 10 controls the mechanical arm 5 to align the syringe 4 to the gap of the workpiece 1 which needs to be filled; the laser coupler 6 can emit the laser beam 7; the laser coupler 6 is installed on the moving platform 8, the moving platform 8 can adjust the spatial position and pose of the laser coupler 6, the moving platform 8 is connected with the industrial computer 10, the industrial computer 10 controls the moving platform 8 to make the laser beam 7 emitted by the laser coupler 6 irradiate the surface of the workpiece 1 along the predetermined track and power; the non-contact temperature sensor 9 detects the real-time temperature of the surface of the workpiece 1 irradiated by the laser beam 7; the non-contact temperature sensor 9 is connected with the industrial computer 10, and the temperature information of the workpiece 1 is fed back to the industrial computer 10 in real time; the reflected light receiver 11 receives the light reflected by the laser beam 7 passing through the conductive glue 3, and feeds back the information to the industrial computer 10, the industrial computer 10 adjusts the laser beam 7 through the information fed back by the non-contact temperature sensor 9 and the reflected light receiver 11, so that the surface irradiated by the laser just improves the fluidity of the conductive glue 3; the hair dryer 12 is connected with the industrial computer 10, when the industrial computer 10 receives the signal that the mechanical arm 5 and the laser coupler 6 complete the predetermined action, the hair dryer 10 is turned on, and the energy and size of the laser beam 7 are adjusted according to the information fed back by the reflected light receiver 11, so that the moisture in the conductive glue 11 is quickly evaporated, and the conductive glue 11 is quickly solidified with the cooperation of the hair dryer 12.

[0043] Example embodiments have been disclosed herein and, although the use of specific terms is exemplified during the course of this specification, these are employed only for descriptive purposes and should not be construed as limiting in any manner. In some embodiments, it will be apparent to one skilled in the art from this disclosure that a feature, technique, or element described in relation to one embodiment can be used in combination with other embodiments unless expressly stated otherwise. Thus, persons skilled in the art will recognize various modifications and changes that can be made to the embodiments without departing from the scope and spirit of the application as set forth in the claims that follow.

Claims

1. An electromagnetic shielding method for laser-guided conductive adhesive sealing, the method being applied to thin-walled, small-gap precision structures, the method comprising the following steps: Step S1, Fix the workpiece: Fix the workpiece (1) on the fixing fixture (2) in preparation for sealing the electromagnetic shield with conductive glue (3); If the workpiece (1) is made of transparent material, it also includes applying dark paint (13) to the part of the workpiece (1) where conductive adhesive needs to be added, and the dark paint should not affect the bonding effect of the conductive adhesive; Step S2, Injector Control: The syringe (4) is used to draw in conductive adhesive (3), and the robotic arm (5) controls the syringe (4) to move to the designated position. The robotic arm (5) then controls the syringe (4) to spray conductive adhesive (3) into the gap that needs to be filled. When it is necessary to stop, the robotic arm (5) controls the syringe (4) to stop spraying adhesive. That is, the robotic arm (5) controls the movement and action of the syringe (4), controls the syringe (4) to move to the designated position, so that the syringe (4) is facing the gap that needs to be filled in the workpiece (1). Then, the action of the syringe (4) is controlled to spray or stop the conductive adhesive. The syringe (4) is an adjustable injection nozzle diameter syringe (4). The adjustable injection nozzle diameter syringe is used to draw in conductive adhesive, and the robotic arm (5) controls the syringe (4) to reach the designated position and controls the spraying and stopping of the conductive adhesive. Step S3, Laser Coupler Control: After the syringe (4) is moved into position, the position and orientation of the laser coupler (6) are controlled by the moving platform (8), so that the laser beam (7) emitted by the laser coupler (6) accurately irradiates the surface adjacent to the gap of the conductive adhesive to be filled on the workpiece (1), and irradiates the surface of the workpiece (1) along a predetermined trajectory and power to heat the surface of the workpiece (1) to reach the optimal temperature to promote the flow of the conductive adhesive (3). The thermally conductive adhesive (3) flows along the preset trajectory under the guidance of the laser to fill the gap of the workpiece (1) that needs to be filled; the moving platform (8) has vertical, horizontal and rotation functions, utilizing the vertical and horizontal functions The mobile platform (8) with rotation function precisely irradiates the laser beam (7) emitted by the laser coupler (6) onto the surface adjacent to the gap of the conductive adhesive to be filled on the workpiece (1), heating the surface of the workpiece (1) to reach the optimal temperature to promote the flow of the conductive adhesive. In this way, the laser guides the flow trajectory of the conductive adhesive, and at the same time, the state of the conductive adhesive is judged based on the reflection of the laser beam through the conductive adhesive. In the laser coupler control process, the industrial control computer (10) also adjusts the power of the laser coupler (6) in real time according to the temperature and conductive adhesive state information collected by the information acquisition module, so as to control the surface temperature irradiated by the laser beam (7) to improve the fluidity of the conductive adhesive. The information acquisition module includes a non-contact temperature sensor (9) and a reflected light receiver (11). The non-contact temperature sensor (9) is used to measure the temperature of the workpiece (1) surface irradiated by the laser beam (7) in real time. The reflected light receiver (11) is used to receive the light reflected by the laser through the conductive adhesive. The reflected light determines the state of the conductive adhesive. In other words, the non-contact temperature sensor (9) and the reflected light receiver (11) are used to receive the temperature of the workpiece (1) surface and the state of the thermally conductive adhesive. Step S4, Cooling and Solidification: When the industrial control computer (10) receives the filling completion signal, it turns on the cooling module to quickly evaporate the moisture in the conductive adhesive, so that the conductive adhesive can quickly solidify to form an electromagnetic shield. Further, turning on the cooling module includes turning on the blower (12) and adjusting the power of the laser coupler (6) to adjust the energy and size of the laser beam (7). Then, by connecting the robotic arm (5), laser coupler (6), non-contact temperature sensor (9), reflective light receiver (11) and blower (12) to the industrial control computer, the industrial control computer (10) receives the feedback signals from the non-contact temperature sensor (9) and reflective light receiver (11) to control the robotic arm (5) and laser coupler (6) to output actions and power. Finally, after the conductive adhesive (3) is added, the industrial control computer (10) controls the laser coupler (6) and blower (12) to quickly cool the thermally conductive adhesive, thereby achieving the sealing of the structure. The filling completion signal received by the industrial control computer (10) is the signal that the robotic arm (5) and laser coupler (6) have completed the predetermined actions.

2. A processing system for processing electromagnetic shielding sealed with conductive adhesive, the system being used to perform the method as described in claim 1, characterized in that, The device includes a fixing clamp (2), a syringe (4), a robotic arm (5), a laser coupler (6), a moving platform (8), a non-contact temperature sensor (9), an industrial computer (10), a reflected light receiver (11), and a blower (12), wherein: the robotic arm (5), the moving platform (8), the non-contact temperature sensor (9), the reflected light receiver (11), and the blower (12) are all electrically connected to the industrial computer (10); the syringe (4) is mounted on the robotic arm (5), and the laser coupler (6) is mounted on the moving platform (8); When the workpiece (1) is made of transparent material, the dark coating (13) is applied to the area where conductive adhesive needs to be added to the workpiece (1); the workpiece (1) is mounted on the fixed fixture (2). If the workpiece is made of transparent material, the dark coating (13) needs to be applied to the area where conductive adhesive (3) needs to be added in advance; the conductive adhesive (3) is drawn into the syringe (4), which has multiple injection ports to change the diameter of the ejected liquid; the syringe (4) is mounted on the operating end of the robotic arm (5), which adjusts the spatial position and posture of the syringe (4) and drives the syringe (4) to deliver the conductive adhesive (3). 3) The injection is produced at different flow rates and diameters. The robotic arm (5) is connected to the industrial control computer (10). The industrial control computer (10) controls the movement of the robotic arm (5) and makes the syringe (4) aim at the gap that needs to be filled in the workpiece (1). The laser coupler (6) emits a laser beam (7). The laser coupler (6) is mounted on the moving platform (8). The moving platform (8) adjusts the spatial position and pose of the laser coupler (6). The moving platform (8) is connected to the industrial control computer (10) and controls the movement of the laser coupler (7). The moving platform (8) causes the laser beam (7) emitted by the laser coupler (6) to irradiate the surface of the workpiece (1) along a predetermined trajectory and power; the non-contact temperature sensor (9) detects the real-time temperature of the surface of the workpiece (1) irradiated by the laser beam (7); the non-contact temperature sensor (9) is connected to the industrial control computer (10) and feeds back the temperature information of the workpiece (1) to the industrial control computer (10) in real time; the reflected light receiver (11) receives the light reflected from the laser beam (7) passing through the conductive adhesive (3) and feeds back the information to the industrial control computer (10), and the industrial control computer (10) communicates with the laser coupler (6) to transmit the laser beam (7) to the surface of the workpiece (1). The laser beam (7) is adjusted based on the information fed back from the non-contact temperature sensor (9) and the reflective light receiver (11) so that the surface temperature irradiated by the laser is just enough to increase the fluidity of the conductive adhesive 3. The blower (12) is connected to the industrial control computer (10). When the industrial control computer (10) receives the signal that the robotic arm (5) and the laser coupler (6) have completed the predetermined action, it turns on the blower and adjusts the energy and magnitude of the laser beam (7) according to the information fed back from the reflective light receiver (11) to quickly evaporate the moisture in the conductive adhesive and make it solidify quickly with the help of the blower (12).

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