Welding jig and laser welding pressing device

Abstract

The utility model relates to the technical field of welding, and provides a welding jig which comprises a bottom plate used for bearing a product to be welded and further comprises a mask plate covering the product, and the mask plate is provided with a laser-impermeable textured surface and a laser-permeable welding surface. The utility model further provides a laser welding pressing device which comprises a laser head and further comprises the welding jig, and a laser beam emitted by the laser head is emitted to the product to be welded on the bottom plate. Compared with the conventional mask plate, the mask plate with the textured surface and the welding surface can greatly reduce the cost by designing the mask plate with the textured surface and the welding surface.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a welding jig and a laser welding and pressing device. Background Art

[0002] Plastic welding refers to a connection method in which the contact surfaces of two plastic parts are melted simultaneously by heating, so as to combine them into an integral whole. There are three common plastic welding methods. The first is the welding technology using an external heat source, such as hot plate welding. The second is the welding technology using mechanical movement, such as ultrasonic welding. The third is the welding technology using electromagnetic action, such as laser welding.

[0003] In the process of traditional heating welding and mechanical welding, thermal aging and plastic micro-particles will be generated in the plastic, which are unacceptable in medical microfluidics. Laser welding has the advantages of non-contact welding, high speed, easy control, etc., and is widely used in the microfluidics field. However, in the process of laser welding, the plastics to be welded need to be closely attached, otherwise the welding effect will be affected. The plastics commonly used in microfluidics are injection-molded or stamped, and the problems brought by large-sized injection molding and stamping are that the flatness of the plastics is not very good, and deformation and warping will occur, which has an adverse effect on laser welding.

[0004] The existing welding uses a coating mask plate or a photoresist mask plate to construct the welding track. This kind of mask plate is expensive and will greatly increase the cost of the welding equipment.

[0005] In addition, the traditional method of welding sequentially along the welding track takes too long, and during the welding process, heat accumulation will cause unstable welding quality. Content of the Utility Model

[0006] The purpose of the utility model is to provide a welding jig and a laser welding and pressing device, which can at least solve some defects in the prior art.

[0007] To achieve the above purpose, the embodiment of the utility model provides the following technical scheme: A welding jig includes a bottom plate for carrying the product to be welded, and also includes a mask plate covering the product. The mask plate has a surface roughened by laser that is impermeable to laser and a welding surface that is permeable to laser.

[0008] Further, the surface roughened by laser is a surface roughened by laser beam.

[0009] Further, the welding surface has a welding track.

[0010] Further, a first transparent flexible layer for padding up the product to be welded is arranged on the bottom plate.

[0011] Further, a second transparent flexible layer that can be pressed on the product is arranged on the side of the mask plate facing the bottom plate.

[0012] Further, it further includes a transparent pressing member pressed on the mask plate.

[0013] Another technical solution provided by the embodiment of the present utility model is: a laser welding and pressing device, including a laser head, and further including the above-mentioned welding jig, and the laser beam emitted by the laser head is irradiated onto the product to be welded on the bottom plate.

[0014] Further, the laser head is a line-scanning laser head.

[0015] Further, it further includes a pressure regulating component for adjusting the pressure of pressing the mask plate onto the bottom plate.

[0016] Further, it further includes a monitoring component for monitoring the welding temperature.

[0017] Compared with the prior art, the beneficial effect of the present utility model is: by designing a mask plate with a textured surface and a welding surface, the cost can be greatly reduced compared with a conventional mask plate. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of a mask plate of a welding jig provided by the embodiment of the present utility model;

[0019] Figure 2 It is a partial structural schematic diagram of a welding jig provided by the embodiment of the present utility model;

[0020] Figure 3 It is a schematic diagram of a laser welding and pressing device provided by the embodiment of the present utility model;

[0021] Figure 4 is Figure 3 a front view perspective schematic diagram;

[0022] Figure 5 It is a schematic diagram of a double-station laser welding device provided by the embodiment of the present utility model;

[0023] Figure 6 It is a schematic diagram of the monitoring component and the laser component of a double-station laser welding device provided by the embodiment of the present utility model;

[0024] In the attached drawing reference numerals: 1 - welding jig; 10 - bottom plate; 11 - mask plate; 110 - textured surface; 111 - welding surface; 1110 - welding track; 12 - first transparent flexible layer; 13 - second transparent flexible layer; 2 - laser welding and pressing device; 20 - pressing glass; 21 - bearing plate; 22 - product; 23 - load-bearing substrate; 24 - drive mechanism; 25 - guide plate; 26 - manual valve; 27 - pressure regulating valve; 3 - double-station laser welding equipment; 30 - welding station; 31 - laser assembly; 310 - strip laser beam; 311 - laser head; 32 - drive assembly; 33 - drive structure; 34 - visual monitoring module; 35 - temperature monitoring module; 36 - laser fiber interface; 37 - fiber optic cable moving assembly. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , an embodiment of the present invention provides a welding jig, including a bottom plate 10 for carrying a product 22 to be welded, and further including a mask plate 11 covering the product 22. The mask plate 11 has a textured surface 110 that is opaque to laser and a welding surface 111 that is transparent to laser. In this embodiment, by designing the mask plate 11 with the textured surface 110 and the welding surface 111, the cost can be greatly reduced compared with the conventional mask plate 11. Specifically, the product 22 to be welded is plastic. The welding is that product A and product B are stacked, and the welding part is between them. Product A and product B are welded together by laser. There are some welding requirements during welding, and not the entire welding part is welded. Therefore, the mask plate 11 is used to achieve this purpose. In the prior art, mostly coated mask plates or photoresist mask plates are used, and the prices of these two mask plates are very expensive. In this embodiment, a textured surface 110 is ingeniously made on the mask plate 11, so that the laser can be prevented from passing through the textured surface 110 to weld the product 22. In this way, only the position of the textured surface 110 needs to be designed to control the welding position. The position where the welding surface 111 is located on the mask plate 11 can be formed by the textured surface 110, that is, after the textured surface 110 is made, the other parts of the mask plate 11 are the welding surface 111, and the product 22 can be welded through the laser.

[0027] As an optimized solution of the embodiment of the present invention, please refer toFigure 1 , Figure 2 , Figure 3 and Figure 4 , the textured surface 110 is a laser-textured surface. In this embodiment, the textured surface 110 is a laser-textured surface, that is, laser is used to texture the mask plate 11. For example, femtosecond laser can be used to form the textured surface. Texturing is to perform frosting treatment on the mask plate 11 to form an opaque area, so that the required welding track 1110 can be formed on the welding surface 111. The depth of laser marking can be controlled to form the textured surface 110 inside the mask plate 11, which can avoid the wear of the textured surface 110 and the welding surface 111 and extend the service life of the mask plate 11. Preferably, the mask plate 11 can be made of transparent materials such as quartz glass, which is inexpensive and easy to form the textured surface 110. Preferably, after adopting the textured surface 110 of this embodiment, the laser can be diffusely reflected, avoiding laser reflection damage to the laser head 311 and eliminating the receptor for absorbing the laser.

[0028] As an optimized solution of the embodiment of the present utility model, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , a first transparent flexible layer 12 for lifting the product to be welded is provided on the bottom plate 10. In this embodiment, for example, if product A is below product B, a first transparent flexible layer 12 can be added between product A and the bottom plate 10. Since it is flexible, when product A is uneven, the first transparent flexible layer 12 can fill the uneven part of product A, which is the deformed and warped position. In this way, when product A and product B are squeezed, the entire surface of product A can be subjected to the squeezing force. Since product A is plastic and plastic has a certain deformation ability, this can make product A and product B more fitting and improve the welding quality between the two. In another embodiment, the side of the mask plate 11 facing the bottom plate 10 has a second transparent flexible layer 13 that can be pressed on the product 22. Similar to the above-mentioned first transparent flexible layer 12, the second transparent flexible layer 13 here is provided between product B and the mask plate 11, and its function is the same as that of the first transparent flexible layer 12, except that it squeezes product B. When both product A and product B are uneven, the first transparent flexible layer 12 and the second transparent flexible layer 13 can be used simultaneously. Preferably, both the first transparent flexible layer 12 and the second transparent flexible layer 13 are silicone layers or other transparent flexible materials in the prior art. Preferably, the hardness of the first transparent flexible layer 12 and the second transparent flexible layer 13 is lower than that of the product 22 to avoid damaging the product 22. In addition, setting the mask plate 11 on the second transparent flexible layer 13 can also protect the mask plate 11 from damage and avoid being scratched when directly placed on the device, extending the service life of the mask plate 11.

[0029] Please refer toFigure 1 , Figure 2 , Figure 3 and Figure 4 , embodiments of the present utility model provide a laser welding and pressing device. By adopting the above-mentioned welding jig 1, all the technical effects of the welding jig 1 can be reflected in the present laser welding and pressing device 2, and will not be elaborated here.

[0030] As an optimized solution of the embodiment of the present utility model, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the laser head is a line-scanning laser head. In this embodiment, the welding efficiency can be greatly improved by line-scanning laser. Traditional welding is carried out along a preset trajectory, and this process takes too long. After adopting the above-mentioned mask plate 11 in this embodiment, the laser beam is first constrained into a strip-shaped laser beam 310, and the length of the strip-shaped laser beam 310 can cover the width of the mask plate 11. Then, by controlling the strip-shaped laser beam 310 to move along the length direction of the mask plate 11, laser line scanning can be realized, and the efficiency is at least twice that of the traditional welding method. The line-scanning laser head here is an upper-level term, which can include a laser head 311 and a driving component 32 for driving the laser head to move.

[0031] As an optimized solution of the embodiment of the present utility model, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 , it further includes a pressure regulating component for adjusting the pressure of pressing the mask plate 11 against the bottom plate 10. In this embodiment, the pressure regulating component includes a pressure regulating valve 27, and the pressure of pressing the mask plate 11 against the bottom plate 10 can be adjusted through the pressure regulating valve 27. Specifically, it is to adjust the pressing force of the pressing glass 20. The pressing glass 20 is a subordinate feature of the transparent pressing member. In addition to the pressing glass 20, other existing transparent hard materials are also available. Pressure regulation is because there will be collapse during laser welding. If the precision of the product 22 is relatively high, collapse cannot occur. Therefore, pressure regulation is required to keep the pressure constant within a certain range during the welding process without too much fluctuation. The pressing glass 20 is pressed by the driving force of the driving mechanism 24. During the pressing welding process, too small pressure will cause poor welding and virtual welding, and too large pressure will cause glue overflow at the welding point and damage the plastic product structure at the same time. Therefore, the pressure can be adjusted through the pressure regulating valve 27 to reach a suitable pressure value. Of course, other pressure regulating methods in the prior art are also feasible, and this embodiment does not limit this. Preferably, multiple sensors are used to monitor the height of the pressing glass 20, so as to know the position of the pressing glass 20 at this time, and judge whether it is necessary to adjust the pressure of the pressing glass 20 according to the preset standard.

[0032] As an optimized solution for the embodiments of the present utility model, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 . The device further includes a monitoring component for monitoring the welding temperature. In this embodiment, the temperature during the welding process is also one of the more important welding indicators, and the temperature can be monitored through the monitoring component. The temperature monitoring module 35 can use an infrared temperature measuring probe. When the temperature does not reach or exceeds the preset temperature, an alarm can be displayed on the software to determine that the welding is a defective product.

[0033] As an optimized solution for the embodiments of the present utility model, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4 . The device further includes a bearing plate 21, a load-bearing base plate 23, a guide plate 25, and a manual valve 26. Among them, the bearing plate 21 is arranged above the pressing glass 20 and is the component directly in contact with the driving force of the driving mechanism 24. The load-bearing base plate 23 is arranged below the bottom plate 10 to bear the overall load. The guide plate 25 can provide guidance, and the manual valve 26 serves as an emergency valve and can manually operate the start and stop of the device.

[0034] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 . The embodiments of the present utility model provide a double-station laser welding device, including two welding stations 30 and a laser component 31 for providing a welding laser beam for the welding stations 30. The two welding stations 30 are arranged side by side. The device further includes a driving component 32 for driving the laser component 31 to move along the direction between the two welding stations 30. The laser beam is a strip-shaped laser beam 310. In this embodiment, by using the strip-shaped laser beam 310 in cooperation with the driving component 32 to form line-scanning laser, the welding of multiple products to be welded 22 can be achieved only by scanning once, which can greatly improve the welding efficiency of double-station welding. Specifically, the line-scanning laser can be achieved by using the strip-shaped laser beam 310 in cooperation with the driving component 32, and the above embodiments have specific introductions. When the welding trajectory 1110 is set, the strip-shaped laser scan can achieve welding, greatly improving the welding efficiency. Especially when combined with double-station welding, the welding of the two stations can be quickly achieved. After scanning once, the position can be detected and sensed by a sensor and compared with the set position. If the detected position reaches the set position, the welding is completed, and the bottom plate 10 will move out of the welding station 30 again to receive materials. If the detected position is not at the set position, it will be scanned again.

[0035] As an optimized solution for the embodiments of the present utility model, Figure 1 ,Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the device further includes a bottom plate 10 for carrying the product 22 to be welded. In this embodiment, the bottom plate 10 is the structure of the above-mentioned welding jig 1. When the welding jig 1 is used in the double-station laser welding device 3, the bottom plate 10 can preferably be a movable component, and the bottom plate 10 is driven to move by a driving structure 33, which can be specifically implemented by a linear module, facilitating the placement of the product 22 on the bottom plate 10. When designed in this way, the components of the welding jig 1 other than the bottom plate 10 are all fixed structures and do not need to move. Of course, the bottom plate 10 can also always be at the welding station, and the feeding will be a little more troublesome, but the feeding can still be carried out.

[0036] As an optimized solution of the embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , the device further includes a monitoring component for monitoring the state during welding. Preferably, the monitoring component includes a visual monitoring module. The monitoring component includes a temperature monitoring module 35. Among them, the visual monitoring module 34 can use a camera to monitor the welding state in real time, and the temperature monitoring module 35 can use an infrared temperature measurement probe. Of course, in addition to the camera and the infrared temperature measurement probe, other existing devices can also be used, and this embodiment does not limit this. The monitored temperature can be fed back to the temperature control software, and then the temperature control software judges the laser control software, and then the laser control software adjusts the laser power, and then acts on the product 22. Therefore, the temperature can be used as the basis for raising or lowering the laser power. The temperature control software and the laser control software here are both existing technologies, and the working principles of the two will not be elaborated here. In addition, another purpose of monitoring the temperature is that when the temperature does not reach or exceeds the preset temperature, an alarm can be displayed on the software to determine that the welding is a defective product. Preferably, the laser component includes a laser head 311, and the temperature monitoring module 35 and the visual monitoring module 34 can both be installed on the laser head 311, and the laser head 311 can move in the Z-axis and X-axis directions, which can be realized by a linear module.

[0037] As an optimized solution of the embodiment of the present invention, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6, a laser fiber interface 36 is provided on the laser assembly 31, and the optical fiber connected to the laser fiber interface 36 is arranged on the optical fiber cable moving assembly 37. In this embodiment, the use of the laser fiber interface 36 facilitates the installation of the optical fiber, and the use of the optical fiber cable moving assembly 37 can change the position of the optical fiber, facilitating the arrangement of the optical fiber.

[0038] As an optimized solution of the embodiment of the present utility model, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , each welding station 30 is provided with a welding jig 1 for clamping the products A and B to be welded. The welding jig 1 includes a transparent flexible layer for making the products A and B to be welded fit closely. The welding jig 1 further includes a mask plate 11 for covering the product A or the product B. In this embodiment, the welding jig 1 and the transparent flexible layer refer to the above embodiment and will not be elaborated here.

[0039] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A welding jig, comprising a base plate for supporting a product to be welded, characterized in that: It also includes a mask plate covering the product, wherein the mask plate has a roughened surface that is not transparent to the laser and a welding surface that is transparent to the laser.

2. The welding jig according to claim 1, characterized in that: The roughened surface is a laser roughened surface.

3. The welding jig according to claim 1, characterized in that: The welding surface is provided with a welding track.

4. The welding jig according to claim 1, characterized in that: The bottom plate is provided with a first transparent flexible layer for supporting the product to be welded.

5. The welding jig according to claim 1 or 4, characterized in that: The mask plate has a second transparent flexible layer on a side facing the base plate which can be pressed onto the product.

6. The welding jig according to claim 1, characterized in that: It also includes a transparent pressing piece pressed on the mask plate.

7. A laser welding and pressing device, comprising a laser head, characterized in that: It also includes a welding jig as described in any one of claims 1 to 6, wherein the laser beam emitted by the laser head is projected onto the product to be welded on the base plate.

8. The laser welding and pressing device according to claim 7, characterized in that: The laser head is a line scanning laser head.

9. The laser welding and pressing device according to claim 7, characterized in that: It also includes a pressure regulating component for adjusting the pressure of pressing the mask plate to the base plate.

10. The laser welding and pressing device according to claim 7, characterized in that: Also included is a monitoring component for monitoring the welding temperature.

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