Pressing device for laser welding of thin plate

Abstract

The utility model discloses a pressing device for laser welding of a thin plate, which comprises a base provided with a welding station, the thin plate is flatly placed on the welding station, a closed welding bead to be welded is formed from the upper surface of the thin plate, and the pressing device further comprises an outer pressing part and an inner pressing part which are respectively and movably arranged above the thin plate up and down. An outer pressing surface and an inner pressing surface are formed on the outer pressing part and the inner pressing part respectively, the outer pressing part is pressed on the area, located on the outer side of the closed weld bead, of the upper surface of the thin plate from the outer pressing surface, and the inner pressing part is pressed on the area, located on the inner side of the closed weld bead, of the upper surface of the thin plate from the inner pressing surface. On one hand, one-time welding forming of the closed weld bead is achieved based on synchronous pressing of the inner side and the outer side of the closed weld bead on the thin plate through cooperation of the inner pressing part and the outer pressing part, welding joints are avoided, and the welding sealing performance is effectively improved; and on the other hand, the capping times are reduced, the probability of product deformation damage is effectively reduced, and in addition, operation is easy and convenient, and efficiency is high.

Description

Technical Field

[0001] The utility model belongs to the technical field of laser welding, and particularly relates to a pressing device for laser welding of thin plates. Background Art

[0002] The thin plate, also known as the current collector plate, is one of the important components of a fuel cell, and the sealing quality determines the service life of the reactor. Laser welding is usually used as an efficient and economical operation method to solve the sealing problem of thin plates of fuel cells.

[0003] The weld beads on the thin plate are usually closed. During normal operation, two welding paths and corresponding welding covers (ensuring that the closed area formed by the weld beads on the thin plate is tightly pressed) usually need to be prepared. That is to say, two welding processes are required. That is, one cover plate presses the thin plate and exposes one of the two welding paths, and the first welding process is performed on the exposed welding path; then, another cover plate presses the thin plate and exposes the other welding path, and the second welding process is performed on this welding path. The welding paths of the two welding processes are butted to form a closed weld bead.

[0004] However, in the actual production process, the prior art has the following defects:

[0005] 1. When the weld beads formed by the two weldings are joined, joints will appear, affecting the sealing performance after welding and posing a leakage hazard;

[0006] 2. For the two weldings, the staff needs to switch different cover plates, which is cumbersome and inconvenient to operate, with low efficiency. Moreover, during multiple pressings of the thin plate, potential hazards such as damage to the thin plate are likely to occur. Summary of the Invention

[0007] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an improved pressing device for laser welding of thin plates.

[0008] To solve the above technical problems, the utility model adopts the following technical solutions:

[0009] A pressing device for laser welding of thin plates includes a base provided with a welding station. The thin plate is placed flat on the welding station and forms a closed weld bead to be welded from the upper surface. The pressing device further includes an outer pressing member and an inner pressing member that are respectively arranged to move up and down above the thin plate. The outer pressing member and the inner pressing member are respectively formed with an outer pressing surface and an inner pressing surface. Among them, the outer pressing member presses on the area of the upper surface of the thin plate outside the closed weld bead from the outer pressing surface, and the inner pressing member presses on the area of the upper surface of the thin plate inside the closed weld bead from the inner pressing surface. And a welding channel for avoiding the closed weld bead is formed between the outer pressing member and the inner pressing member.

[0010] According to a specific implementation and preferred aspect of the present utility model, the external pressure component includes a horizontally arranged cover plate, wherein an open mouth is formed on the cover plate, and in the orthographic projection on the horizontal plane, the closed weld bead and the internal pressure component are located inside the open mouth and are distributed in sequence from outside to inside. Herein, the structure is simple, facilitating installation and implementation.

[0011] Preferably, a support portion that bulges upward is formed on the base at the welding station, and the thin plate is supported on the support portion from the lower surface; a pressing portion that bulges downward and corresponds to the support portion is formed on the bottom surface of the cover plate, wherein the bottom surface of the pressing portion forms an external pressure surface. Herein, on the premise of meeting the requirements for clamping and positioning the thin plate, the contact area between the base and the cover plate and the thin plate can be effectively reduced, reducing the probability of deformation and damage of the thin plate, which is beneficial to improving the yield rate.

[0012] Specifically, the support portion and the pressing portion are arranged vertically aligned; the pressing portion extends along the edge of the open mouth.

[0013] According to another specific implementation and preferred aspect of the present utility model, the thin plate has air holes, and the internal pressure component includes an internal pressure module that forms an internal pressure surface from the bottom and a limiting module that extends downward from the bottom of the internal pressure module. When the limiting module passes through the air holes and abuts against the base, the internal pressure module presses on the upper surface of the thin plate synchronously from the internal pressure surface. Herein, through the limiting module, overpressure problems can be avoided.

[0014] Preferably, the internal pressure component further includes a locking member for locking or unlocking the internal pressure module and the base. When the limiting module passes through the air holes and abuts against the base, the locking member synchronously drives the internal pressure module to press down and lock on the base. Herein, during the welding process, the pressing of the thin plate is ensured to be stable.

[0015] Preferably, the locking member includes a locking rod movably arranged on the base and a locking portion extending downward from the bottom of the internal pressure module. One end of the locking rod forms a locking tongue, and a locking hole matching the locking tongue is formed on the locking portion. When the locking tongue is inserted into the locking hole, the internal pressure module is locked with the base, and when the locking tongue disengages from the locking hole, the internal pressure module is unlocked from the base.

[0016] Preferably, a first inclined surface is formed on the locking tongue, and a second inclined surface matching the first inclined surface is formed on the locking hole. As the locking tongue is inserted into the locking hole, the first inclined surface and the second inclined surface gradually fit together to form a downward pressure on the internal pressure module. Herein, it is convenient to form a gradually increasing downward pressure, thereby realizing the gentle pressing of the thin plate and reducing deformation.

[0017] Preferably, a first channel extending horizontally is formed on the base, and a second channel connected to one end of the first channel and extending vertically is formed. The locking rod is inserted into the first channel, and the locking portion passes downward through the air holes and is inserted into the second channel. Herein, it is convenient for installation and implementation.

[0018] In addition, the locking rod protrudes from one end away from the locking tongue out of the first channel and forms an operating part for pulling the locking rod outwards; a limiting groove communicating with the first channel is further formed on the base, and a limiting part limited in the limiting groove and an elastic part abutted between the inner wall of the limiting groove and the limiting part are fixedly arranged on the locking rod, wherein the elastic part drives the locking rod to have a tendency to move towards the locking part. Herein, automatic locking is achieved and the operation is convenient.

[0019] Due to the implementation of the above technical solutions, the present utility model has the following advantages compared with the prior art:

[0020] In the prior art, the closed weld bead is welded twice, which easily results in joints at the connection of the weld beads, affecting the sealing performance after welding and posing a leakage hazard; at the same time, the two weldings require the staff to switch different covers, with cumbersome and inconvenient operations, low efficiency, and in the multiple capping of thin plates, it is easy to cause hidden dangers such as damage to the thin plates. While the present application conducts an overall design on the structure of the pressing device for laser welding of thin plates, skillfully solves the deficiencies and defects of the prior art. After adopting this pressing device, the thin plate is placed flat on the welding station, the outer pressing component is driven to press on the area of the upper surface of the thin plate outside the closed weld bead from the outer pressing surface, and the inner pressing component is driven to press on the area of the upper surface of the thin plate inside the closed weld bead from the inner pressing surface, so that a welding channel for avoiding the closed weld bead is formed between the outer pressing component and the inner pressing component, and laser welding is used to form a single weld along the path of the closed weld bead through the welding channel. Therefore, compared with the prior art, on the one hand, through the cooperation of the inner and outer pressing components, based on the synchronous pressing of the inside and outside of the closed weld bead on the thin plate, the closed weld bead is formed by a single welding, avoiding the appearance of welding joints and effectively improving the sealing performance of the welding; on the other hand, the number of capping times is reduced, effectively reducing the probability of product deformation and damage. In addition, the operation is simple and convenient, and the efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The following further describes the present utility model in detail with reference to the drawings and specific embodiments.

[0022] Figure 1 is a three-dimensional structural schematic diagram of the pressing device for laser welding of thin plates of the present utility model;

[0023] Figure 2 is an exploded structural schematic diagram of the pressing device for laser welding of thin plates of the present utility model;

[0024] Figure 3 is a top view schematic diagram of the pressing device for laser welding of thin plates of the present utility model;

[0025] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in

[0026] Figure 5 isFigure 4 Schematic enlarged view of the local structure

[0027] Wherein: 1. Base; 10. Support part; 11. First channel; 12. Second channel; 13. Limit groove

[0028] 2. External pressure component; 20. Cover plate; 200. Pressing part; m1. External pressure surface; k. Open mouth

[0029] 3. Internal pressure component; 30. Internal pressure module; m2. Internal pressure surface; t. Welding channel; 31. Limit module; 32. Locking part; 320. Lock rod; a0. Lock tongue; a1. Operating part; a2. Limiting part; a3. Elastic part; 321. Locking portion; b0. Lock hole Detailed implementation manners

[0030] To make the above objects, features, and advantages of the present application more apparent and understandable, the following describes the detailed implementation manners of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0032] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0033] In this application, unless otherwise clearly defined and limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In this application, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "under", "beneath" and "underneath" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0035] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation.

[0036] As Figures 1 to 5 shown, the pressing device for thin plate laser welding involved in this embodiment includes a base 1, an external pressing member 2, and an internal pressing member 3.

[0037] Specifically, a welding station is provided on the base 1, and the thin plate is placed flat on the welding station and a rectangular closed weld bead to be welded is formed on its upper surface. One welding station can be provided, or multiple welding stations can be provided.

[0038] In this example, the external pressing member 2 and the internal pressing member 3 are respectively arranged to move up and down above the thin plate. The external pressing member 2 and the internal pressing member 3 are respectively formed with an external pressing surface m1 and an internal pressing surface m2. Among them, the external pressing member 2 presses on the upper surface of the thin plate in the area outside the closed weld bead from the external pressing surface m1, and the internal pressing member 3 presses on the upper surface of the thin plate in the area inside the closed weld bead from the internal pressing surface m2, and a welding channel t for avoiding the closed weld bead is formed between the external pressing member 2 and the internal pressing member 3.

[0039] In some specific embodiments, the external pressure component 2 includes a horizontally arranged cover plate 20, wherein a rectangular open opening k is formed on the cover plate 20, and in the orthographic projection on the horizontal plane, the closed weld bead and the internal pressure component 3 are located inside the open opening k and are distributed in sequence from outside to inside. It should be particularly noted that there are two closed weld beads on the thin plate in this embodiment and they are located at both ends. Therefore, there are two corresponding open openings k and two corresponding internal pressure components 3.

[0040] For the convenience of implementation, a supporting portion 10 that protrudes upward is formed on the base 1 at the welding station, and the thin plate is supported on the supporting portion 10 from the lower surface; a downwardly protruding pressing portion 200 corresponding to the supporting portion 10 is formed on the bottom surface of the cover plate 20, wherein an external pressure surface m1 is formed on the bottom surface of the pressing portion 200; the supporting portion 10 and the pressing portion 200 are arranged vertically aligned; the pressing portion 200 extends along the edge of the open opening k.

[0041] In this example, there are air holes on the thin plate. The internal pressure component 3 includes an internal pressure module 30 that forms an internal pressure surface m2 from the bottom, a limiting module 31 that extends downward from the bottom of the internal pressure module 30, and a locking member 32 for locking or unlocking the internal pressure module 30 with the base 1. When the limiting module 31 passes through the air hole and abuts against the base 1, the internal pressure module 30 is simultaneously pressed against the upper surface of the thin plate from the internal pressure surface m2, and the locking member 32 simultaneously drives the internal pressure module 30 to press down and lock it on the base 1.

[0042] In some specific embodiments, the locking member 32 includes a locking rod 320 movably arranged on the base 1 and a locking portion 321 that extends downward from the bottom of the internal pressure module 30. One end of the locking rod 320 forms a locking tongue a0, and a locking hole b0 matching the locking tongue is formed on the locking portion 321. When the locking tongue a0 is inserted into the locking hole b0, the internal pressure module 30 is locked with the base 1. When the locking tongue a0 disengages from the locking hole b0, the internal pressure module 30 is unlocked from the base 1; a first inclined surface is formed on the locking tongue a0, and a second inclined surface matching the first inclined surface is formed on the locking hole b0. As the locking tongue a0 is inserted into the locking hole b0, the first inclined surface and the second inclined surface gradually fit together and form a downward pressure on the internal pressure module 30.

[0043] For further facilitating implementation, a horizontally extending first channel 11 and a vertically extending second channel 12 communicating with one end of the first channel 11 are formed on the base 1. The locking rod 320 is inserted into the first channel 11, and the locking portion 321 passes downward through the air hole and is inserted into the second channel 12; the locking rod 320 protrudes from the first channel 11 at the end far from the locking tongue a0 and forms an operation portion a1 for pulling the locking rod 320 outward; a limiting groove 13 communicating with the first channel 11 is further formed on the base 1, and a limiting portion a2 limited in the limiting groove 13 and an elastic member a3 abutted between the inner wall of the limiting groove 13 and the limiting portion a2 are fixedly arranged on the locking rod 320. The elastic member a3 drives the locking rod 320 to have a tendency to move towards the locking portion 321. The elastic member a3 is a conventional spring, and springs of different specifications are selected according to actual requirements to form different downward pressures. In addition, a third inclined surface extending obliquely downward and away from the locking rod 320 is formed at the lower end of the locking portion 321. As the inner pressure module 30 is pressed downward, the locking portion 321 abuts against the locking tongue a0 from the third inclined surface and drives the locking rod 320 to retreat. When the locking tongue a0 disengages from the third inclined surface, the locking rod 320 moves forward under the spring reset and drives the first inclined surface and the second inclined surface to gradually fit, realizing automatic locking.

[0044] In summary, after adopting this pressing device, the thin plate is placed flat on the welding station, the outer pressing component is driven to press on the area of the upper surface of the thin plate outside the closed weld bead from the outer pressing surface, and the inner pressing component is driven to press on the area of the upper surface of the thin plate inside the closed weld bead from the inner pressing surface, so that a welding channel for avoiding the closed weld bead is formed between the outer pressing component and the inner pressing component, and laser welding is used to form a single-pass weld along the path of the closed weld bead through the welding channel. Therefore, compared with the prior art, on the one hand, through the cooperation of the inner and outer pressing components, based on synchronously pressing the inside and outside of the closed weld bead on the thin plate, the closed weld bead is formed in a single-pass weld, avoiding the appearance of welding joints and effectively improving the welding tightness; on the other hand, the number of pressing covers is reduced, effectively reducing the probability of product deformation and damage. In addition, the operation is simple and convenient, and the efficiency is high; on the third hand, on the premise of meeting the requirements of clamping and positioning of the thin plate, the contact area between the base and the cover plate and the thin plate can be effectively reduced, reducing the probability of deformation and damage of the thin plate and being beneficial to improving the qualified rate; on the fourth hand, through the limiting module, the problem of overpressure is avoided; on the fifth hand, it is convenient to form a gradually increasing downward pressure, so as to realize the gentle pressing of the thin plate and reduce deformation; on the sixth hand, automatic locking is realized, and the operation is convenient.

[0045] The above has made a detailed description of the present invention, but the present invention is not limited to the above embodiments. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A pressing device for laser welding of thin plates, which comprises a base provided with a welding station, the thin plates are placed flat on the welding station and form a closed weld bead to be welded from the upper surface, and is characterized in that: The pressing device further includes an outer pressing member and an inner pressing member which are respectively arranged to move up and down above the thin plate. The outer pressing member and the inner pressing member are respectively formed with an outer pressing surface and an inner pressing surface. Wherein, the outer pressing member presses on the area of the upper surface of the thin plate located outside the closed weld bead from the outer pressing surface, and the inner pressing member presses on the area of the upper surface of the thin plate located inside the closed weld bead from the inner pressing surface, and a welding channel for avoiding the closed weld bead is formed between the outer pressing member and the inner pressing member.

2. The pressing device for thin plate laser welding according to claim 1, characterized in that: The outer pressing member includes a cover plate arranged horizontally. An open mouth is formed on the cover plate, and in the orthographic projection on the horizontal plane, the closed weld bead and the inner pressing member are located inside the open mouth and are distributed in sequence from outside to inside.

3. The pressing device for thin plate laser welding according to claim 2, characterized in that: A support portion which protrudes upward is formed on the base at the welding station, and the thin plate is supported on the support portion from the lower surface; a pressing portion which protrudes downward and corresponds to the support portion is formed on the bottom surface of the cover plate, and the outer pressing surface is formed on the bottom surface of the pressing portion.

4. The pressing device for thin plate laser welding according to claim 3, characterized in that: The support portion and the pressing portion are arranged to be vertically aligned; the pressing portion extends along the edge of the open mouth.

5. The pressing device for thin plate laser welding according to claim 1, characterized in that: The thin plate has air holes. The inner pressing member includes an inner pressing module which forms the inner pressing surface from the bottom, and a limiting module which extends downward from the bottom of the inner pressing module. When the limiting module passes through the air holes and abuts against the base, the inner pressing module presses on the upper surface of the thin plate from the inner pressing surface synchronously.

6. The pressing device for thin plate laser welding according to claim 5, characterized in that: The inner pressing member further includes a locking member for locking or unlocking the inner pressing module and the base. When the limiting module passes through the air holes and abuts against the base, the locking member synchronously drives the inner pressing module to press down and lock on the base.

7. The pressing device for thin plate laser welding according to claim 6, wherein: The locking member includes a locking rod movably arranged on the base and a locking portion extending downward from the bottom of the inner pressing module. A locking tongue is formed at one end of the locking rod, and a locking hole matching the locking tongue is formed on the locking portion. When the locking tongue is inserted into the locking hole, the inner pressing module is locked with the base, and when the locking tongue disengages from the locking hole, the inner pressing module is unlocked from the base.

8. The pressing device for thin plate laser welding according to claim 7, characterized in that: A first inclined surface is formed on the locking tongue, and a second inclined surface matching the first inclined surface is formed on the locking hole. As the locking tongue is inserted into the locking hole, the first inclined surface and the second inclined surface gradually fit together and form a downward pressure on the inner pressing module.

9. The pressing device for thin plate laser welding according to claim 7, characterized in that: A first channel extending horizontally and a second channel extending vertically and communicating with one end of the first channel are formed on the base. The locking rod is inserted into the first channel, and the locking portion passes through the air holes downward and is inserted into the second channel.

10. The pressing device for thin plate laser welding according to claim 9, characterized in that: The locking rod protrudes out of the first channel from the end far away from the locking tongue and forms an operation portion for pulling the locking rod outward; a limiting groove communicating with the first channel is further formed on the base, and a limiting portion limited in the limiting groove and an elastic member abutting between the inner wall of the limiting groove and the limiting portion are further fixedly arranged on the locking rod, and the elastic member drives the locking rod to have a tendency to move towards the locking portion.

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