Negative pressure adsorption clamp and welding equipment

Abstract

The utility model provides a negative pressure adsorption clamp and welding equipment, the negative pressure adsorption clamp comprises an adsorption plate, the adsorption plate is provided with an adsorption surface, the adsorption surface is provided with a first negative pressure port and a second negative pressure port, and the first negative pressure port is used for adsorbing a lower layer workpiece; the negative pressure cover is arranged corresponding to the second negative pressure opening, the upper-layer workpiece is located between the negative pressure cover and the adsorption surface, a first negative pressure cavity is formed between the negative pressure cover and the upper-layer workpiece, and the second negative pressure opening sequentially penetrates through the lower-layer workpiece and the upper-layer workpiece and is communicated to the first negative pressure cavity; and the negative pressure source is communicated with the first negative pressure port and the second negative pressure port. The upper-layer workpiece and the lower-layer workpiece can be adsorbed and positioned in a negative pressure adsorption mode, and circumferential welding of the upper-layer workpiece and the lower-layer workpiece is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of welding fixtures, in particular to a negative pressure adsorption fixture and welding equipment. Background Art

[0002] The method of fixing the workpiece by adsorbing the workpiece with negative pressure is widely used in the field of fixtures. Existing negative pressure adsorption fixtures can usually only adsorb and fix one layer of workpieces, and for workpieces stacked together, that is, two layers of upper and lower stacked, it is difficult to fix the workpiece on the upper layer with negative pressure. In the prior art, the lower layer workpiece is usually fixed by negative pressure, and the upper layer workpiece needs to be pressed down and fixed by an external mechanism so that the upper and lower layers fit together to facilitate welding. However, for the upper layer workpiece that needs to be welded in a full circumferential circle, the external mechanism for pressing down the upper layer workpiece will cause spatial interference with the welding head, affecting the welding efficiency. Utility Model Content

[0003] In view of the deficiencies of the prior art, the first object of the utility model is to provide a negative pressure adsorption fixture, which can adsorb and position the upper and lower workpieces by negative pressure adsorption, thereby facilitating the circumferential welding of the upper and lower workpieces.

[0004] The second object of the utility model is to provide a welding device with high processing efficiency.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A negative pressure adsorption fixture comprises: an adsorption plate, which is provided with an adsorption surface, on which a first negative pressure port and a second negative pressure port are provided, the first negative pressure port is used to adsorb a lower workpiece; a negative pressure cover, which is arranged corresponding to the second negative pressure port, the upper workpiece is located between the negative pressure cover and the adsorption surface, a first negative pressure cavity is formed between the negative pressure cover and the upper workpiece, the second negative pressure port passes through the lower workpiece and the upper workpiece in sequence and is connected to the first negative pressure cavity; a negative pressure source, which is connected to the first negative pressure port and the second negative pressure port.

[0007] According to a preferred embodiment, the adsorption plate includes a top plate, the adsorption surface is arranged on the first side surface of the top plate, and a first sealing plate is arranged on the second side surface of the adsorption plate, the first side surface and the second side surface are arranged opposite to each other, and a second negative pressure chamber is formed between the first sealing plate and the second side surface, and the second negative pressure port is opened on the top plate and connected to the second negative pressure chamber; a first air guide hole is arranged on the top plate and / or the first sealing plate, one end of the first air guide hole is connected to the negative pressure source, and the other end of the first air guide hole is connected to the second negative pressure chamber.

[0008] According to a preferred embodiment, a first groove is provided on the second side surface of the top plate and / or the side surface of the first sealing plate facing the top plate, and the first groove is used to form the second negative pressure chamber.

[0009] According to a preferred embodiment, the adsorption plate also includes a bottom plate and a second sealing plate, the first sealing plate is located between the second sealing plate and the top plate, and the second sealing plate is located between the bottom plate and the top plate; the first negative pressure port is opened on the top plate, and the second sealing plate is provided with a first air hole corresponding to the first negative pressure port; a third negative pressure chamber is formed between the bottom plate and the second sealing plate, and the third negative pressure chamber is connected to the first negative pressure port through the first air hole; a second air guide hole is provided on the bottom plate, one end of the second air guide hole is connected to the negative pressure source, and the other end of the second air guide hole is connected to the third negative pressure chamber.

[0010] According to a preferred embodiment, a second groove is provided on the second side surface of the top plate, the first sealing plate is embedded in the second groove, and the first air guide hole is provided on the top plate; a third groove is provided on the side surface of the bottom plate facing the top plate, and the second sealing plate is embedded in the third groove.

[0011] According to a preferred embodiment, an inner ring groove and an outer ring groove are provided at the bottom of the third groove, the outer ring groove is arranged around the inner ring groove, a sealing ring convex is formed between the inner ring groove and the outer ring groove, the inner ring groove is used to form the third negative pressure chamber, the sealing ring convex is attached to the second sealing plate, the first air vent is connected to the inner ring groove, and one end of the second air guide hole extends to the inner ring groove.

[0012] According to a preferred embodiment, an air guiding notch corresponding to and communicating with the first air vent is provided on the side wall of the inner annular groove.

[0013] According to a preferred embodiment, the air guiding notch extends toward the inside of the area surrounded by the inner annular groove.

[0014] According to a preferred embodiment, the side surface of the negative pressure cover facing the adsorption surface is configured as a pressing surface, and a fourth groove is provided on the pressing surface, and the fourth groove is used to form the first negative pressure chamber; a first positioning pin is provided on the adsorption surface, a positioning protrusion is provided at the bottom of the fourth groove, and a third positioning hole is provided on the positioning protrusion which is adapted to the first positioning pin.

[0015] A welding device comprises a frame, a laser welding head and the aforementioned negative pressure adsorption fixture, wherein the laser welding head and the negative pressure adsorption fixture are both assembled on the frame.

[0016] The technical solution of the embodiment of the utility model has at least the following advantages and beneficial effects:

[0017] The utility model has a negative pressure source acting on the first negative pressure port and the second negative pressure port, so that negative pressure is generated at the first negative pressure port and the second negative pressure port, the lower surface of the lower workpiece is attached to the adsorption surface, and the lower surface of the lower workpiece is covered at the first negative pressure port, so that the lower workpiece is positioned by the negative pressure adsorption of the first negative pressure port. When the negative pressure source acts on the second negative pressure port, negative pressure is generated in the first negative pressure chamber, so that the negative pressure cover presses the upper workpiece from top to bottom to fit it to the upper surface of the lower workpiece under the action of atmospheric pressure, thereby realizing the fitting and fixing of the upper workpiece and the lower workpiece. At the same time, the negative pressure cover realizes the downward pressure force on the upper workpiece through the negative pressure at the second negative pressure port. Therefore, during the period when the negative pressure cover fixes the upper workpiece, the peripheral space thereof is open, which can ensure that the welding head performs circumferential welding on the upper workpiece, thereby ensuring welding efficiency and quality. The stacked upper and lower workpieces are fixed by negative pressure adsorption, which is convenient to adjust the negative pressure adsorption strength, and the fixing and releasing efficiency is high. Overall, the processing efficiency can be improved while ensuring the fixing strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of the negative pressure adsorption fixture provided by the embodiment of the utility model after assembling a workpiece;

[0020] Figure 2 A schematic diagram of a first exploded structure of the negative pressure adsorption fixture provided by an embodiment of the utility model after assembling a workpiece;

[0021] Figure 3 for Figure 2 A partial enlarged schematic diagram of the structure at A in the middle;

[0022] Figure 4 for Figure 2 A partial enlarged schematic diagram of the structure at B in the middle;

[0023] Figure 5 A schematic diagram of a second exploded structure of the negative pressure adsorption fixture provided by an embodiment of the utility model after assembling a workpiece;

[0024] Figure 6 for Figure 5 A partial enlarged schematic diagram of the structure at C in the middle;

[0025] Figure 7 A schematic diagram of the top view of the structure of the negative pressure adsorption fixture provided by an embodiment of the utility model after the workpiece is assembled;

[0026] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the middle DD section;

[0027] Fig. 9 for Figure 7 Schematic diagram of the cross-sectional structure of the EE section;

[0028] Fig.10 for Figure 7 Schematic diagram of the cross-sectional structure of the FF section;

[0029] Fig.11 A schematic diagram of the three-dimensional structure of a negative pressure cover provided in an embodiment of the utility model.

[0030] Icons: 1. Adsorption plate; 10. Top plate; 100. Adsorption surface; 101. First negative pressure port; 1011. First negative pressure hole; 102. Second negative pressure port; 1021. Second negative pressure hole; 103. First positioning pin; 104. Second groove; 105. First suction cup assembly; 106. Second suction cup assembly; 107. First air guide hole; 108. Second positioning hole; 11. First sealing plate; 110. First groove; 111. First through groove; 12. Bottom plate; 121. Inner ring groove; 122. Outer ring groove; 123 , sealing ring convex; 124, third groove; 125, second air guide hole; 126, second positioning pin; 127, air guide notch; 13, second sealing plate; 131, first air vent; 2, negative pressure cover; 21, grabbing part; 22, pressing surface; 221, fourth groove; 222, positioning protrusion; 223, third positioning hole; 31, lower workpiece; 311, first through hole; 32, upper workpiece; 321, second through hole; 322, first positioning hole; 4, first negative pressure chamber; 5, second negative pressure chamber; 6, third negative pressure chamber. DETAILED DESCRIPTION

[0031] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] Please refer to Figures 1 to 11 , a negative pressure adsorption fixture used to clamp and fix Figure 2 and Figure 4 The upper workpiece 32 and the lower workpiece 31 shown, specifically, the lower workpiece 31 is in the shape of a thin sheet, and a first through hole 311 is penetrated therethrough, the upper workpiece 32 is adapted to the first through hole 311, the upper workpiece 32 covers the first through hole 311, and the lower surface of the upper workpiece 32 is adhered to the upper surface of the lower workpiece 31; the upper workpiece 32 is penetrated by a second through hole 321 and a first positioning hole 322, and when the upper workpiece 32 and the lower workpiece 31 are adhered to each other, the second through hole 321 and the first positioning hole 322 are both within the range of the first through hole 311.

[0035] In this embodiment, the negative pressure adsorption fixture includes an adsorption plate 1, a negative pressure cover 2 and a negative pressure source, wherein: the adsorption plate 1 is provided with an adsorption surface 100, and the adsorption surface 100 is provided with a first negative pressure port 101 and a second negative pressure port 102, and the first negative pressure port 101 is used to adsorb the lower workpiece 31; the negative pressure cover 2 and the second negative pressure port 102 are arranged correspondingly, and the upper workpiece 32 is located between the negative pressure cover 2 and the adsorption surface 100, and a first negative pressure cavity 4 is formed between the negative pressure cover 2 and the upper workpiece 32, and the second negative pressure port 102 passes through the lower workpiece 31 and the upper workpiece 32 in sequence and is connected to the first negative pressure cavity 4; the negative pressure source is connected to the first negative pressure port 101 and the second negative pressure port 102. Figure 2 and Figure 3As shown, the negative pressure source acts on the first negative pressure port 101 and the second negative pressure port 102, so that negative pressure is generated at the first negative pressure port 101 and the second negative pressure port 102. When in use, the lower surface of the lower workpiece 31 is attached to the adsorption surface 100, and the lower surface of the lower workpiece 31 covers the first negative pressure port 101, so that the lower workpiece 31 is positioned by the negative pressure adsorption of the first negative pressure port 101. The second negative pressure port 102 is within the range of the first through hole 311 and is connected to the first negative pressure chamber 4 through the second through hole 321. When the negative pressure source acts on the second negative pressure port 102, negative pressure is generated in the first negative pressure chamber 4, so that the negative pressure cover 2 is moved from top to bottom under the action of atmospheric pressure. The upper workpiece 32 is pressed and fitted to the upper surface of the lower workpiece 31, thereby achieving the fit and fixation of the upper workpiece 32 and the lower workpiece 31. At the same time, the negative pressure cover 2 realizes the downward pressure on the upper workpiece 32 through the negative pressure at the second negative pressure port 102. Therefore, during the period when the negative pressure cover 2 fixes the upper workpiece 32, the peripheral space is open, which can ensure that the welding head can perform circumferential welding on the upper workpiece 32, thereby ensuring welding efficiency and quality. The stacked upper workpiece 32 and the lower workpiece 31 are fixed by negative pressure adsorption, which makes it convenient to adjust the negative pressure adsorption strength, and the fixing and releasing efficiency is high. Overall, the processing efficiency can be improved while ensuring the fixing strength.

[0036] In this embodiment, the adsorption plate 1 includes a top plate 10, an adsorption surface 100 is arranged on the first side of the top plate 10, a first sealing plate 11 is arranged on the second side of the adsorption plate 1, the first side and the second side are arranged opposite to each other, a second negative pressure chamber 5 is formed between the first sealing plate 11 and the second side, a second negative pressure port 102 is opened on the top plate 10, and is connected to the second negative pressure chamber 5; a first air guide hole 107 is arranged on the top plate 10 and / or the first sealing plate 11, one end of the first air guide hole 107 is connected to the negative pressure source, and the other end of the first air guide hole 107 is connected to the second negative pressure chamber 5. Preferably, as Figure 5 and Figure 6 As shown, a second groove 104 is provided on the second side surface of the top plate 10, the first sealing plate 11 is embedded in the second groove 104, and the first air guide hole 107 is provided on the top plate 10. In this way, the thickness of the negative pressure adsorption fixture can be reduced. The first sealing plate 11 and the top plate 10 are detachably connected and assembled by bolts or screws, which is convenient for processing and disassembly.

[0037] A first groove 110 is provided on the second side surface of the top plate 10 and / or the side surface of the first sealing plate 11 facing the top plate 10, and the first groove 110 is used to form the second negative pressure chamber 5. Preferably, as Figure 2 , Figure 3 and Figure 8As shown, the first groove 110 is arranged on the side of the first sealing plate 11 facing the top plate 10. In this embodiment, the number of the second negative pressure ports 102 is three, corresponding to the three first through holes 311 of the lower workpiece 31. In order to improve the sealing performance of the second negative pressure chamber 5 and reduce the processing difficulty of the negative pressure adsorption fixture, the number of the first grooves 110 is three, corresponding to the three second negative pressure ports 102 one by one, and the three first grooves 110 are connected through the first through groove 111.

[0038] In this embodiment, the adsorption plate 1 also includes a bottom plate 12 and a second sealing plate 13. The first sealing plate 11 is located between the second sealing plate 13 and the top plate 10, and the second sealing plate 13 is located between the bottom plate 12 and the top plate 10. The first negative pressure port 101 is opened on the top plate 10, and the second sealing plate 13 is provided with a first air hole 131 corresponding to and connected to the first negative pressure port 101. A third negative pressure chamber 6 is formed between the bottom plate 12 and the second sealing plate 13, and the third negative pressure chamber 6 is connected to the first negative pressure port 101 through the first air hole 131. A second air guide hole 125 is provided on the bottom plate 12, and one end of the second air guide hole 125 is connected to the negative pressure source, and the other end of the second air guide hole 125 is connected to the third negative pressure chamber 6. Figure 1 , Figure 3 and Figure 5 As shown, the second sealing plate 13 and the bottom plate 12 are detachably assembled by bolts or screws, and the bottom plate 12 and the top plate 10 are detachably assembled by bolts or screws. Figure 2 As shown, a third groove 124 is provided on one side of the bottom plate 12 facing the top plate 10, and the second sealing plate 13 is embedded in the third groove 124. Such a configuration is conducive to reducing the thickness of the adsorption plate 1, and is convenient for the transportation and use of the negative pressure adsorption fixture.

[0039] Furthermore, if Figure 2 and Figure 4 As shown, an inner ring groove 121 and an outer ring groove 122 are provided at the bottom of the third groove 124. The outer ring groove 122 is arranged around the inner ring groove 121. A sealing ring convex 123 is formed between the inner ring groove 121 and the outer ring groove 122. The inner ring groove 121 is used to form a third negative pressure chamber 6. The sealing ring convex 123 is attached to the second sealing plate 13. The first air vent 131 is connected to the inner ring groove 121, and one end of the second air guide hole 125 extends to the inner ring groove 121.

[0040] Furthermore, in the present embodiment, the number of the first negative pressure ports 101 is eight, and an air guide notch 127 corresponding to and connected to the first air vent 131 is provided on the side wall of the inner annular groove 121. Preferably, the air guide notch 127 extends to the inside of the area enclosed by the inner annular groove 121. The air guide notch 127 can increase the area of ​​the connecting area between the inner annular groove 121 and the first air vent 131, ensuring that the air in the area where the first negative pressure port 101 is located can be smoothly drawn out to form a negative pressure environment. The structural design of the air guide notch 127 extending to the inside of the area enclosed by the inner annular groove 121 can avoid affecting the area where the sealing ring convex 123 is attached to the second sealing plate 13, thereby ensuring the sealing of the third negative pressure chamber 6.

[0041] In this embodiment, a first positioning pin 103 is provided on the adsorption surface 100 , and the first positioning pin 103 is used to position the upper workpiece 32 . Specifically, when the upper workpiece 32 and the lower workpiece 31 are assembled, the first positioning pin 103 is embedded in the first positioning hole 322 .

[0042] In this embodiment, the bottom plate 12 is provided with a second positioning pin 126, and the top plate 10 is provided with a second positioning hole 108 adapted to the second positioning pin 126. When the top plate 10 and the bottom plate 12 are assembled, the second positioning pin 126 is inserted into the second positioning hole 108, which facilitates the positioning and assembly of the top plate 10 and the bottom plate 12.

[0043] like Figure 5 and Figure 6 As shown, the negative pressure adsorption fixture also includes a first suction cup assembly 105 and a second suction cup assembly 106, which are respectively arranged through the top plate 10, and the first suction cup assembly 105 is provided with a first negative pressure hole 1011, which is connected to the third negative pressure chamber 6 through the first air vent 131, and the first negative pressure port 101 is located at one end of the first negative pressure hole 1011 facing the negative pressure cover 2; the second suction cup assembly 106 is provided with a second negative pressure hole 1021, which is connected to the second negative pressure chamber 5, and the second negative pressure port 102 is located at one end of the second negative pressure hole 1021 facing the negative pressure cover 2. In this embodiment, the first suction cup assembly 105 is detachably assembled with the second sealing plate 13 and the top plate 10 by bolts or screws, and the second suction cup assembly 106 is detachably assembled with the top plate 10 by bolts or screws.

[0044] like Figure 8 and Fig.11As shown, the side of the negative pressure cover 2 facing the adsorption surface 100 is configured as a pressing surface 22, and a fourth groove 221 is provided on the pressing surface 22, and the fourth groove 221 is used to form the first negative pressure chamber 4; a positioning protrusion 222 is provided at the bottom of the fourth groove 221, and a third positioning hole 223 adapted to the first positioning pin 103 is provided on the positioning protrusion 222. When the negative pressure cover 2 is assembled with the top plate 10, the pressing surface 22 is attached to the adsorption surface 100. Optionally, the negative pressure cover 2 is made of silicone material. On the one hand, the silicone material can avoid abrasion of the upper material, and on the other hand, the negative pressure cover 2 can be partially deformed during the process of forming negative pressure in the first negative pressure chamber 4 so that the pressing surface 22 is closely attached to the adsorption surface 100, so as to improve the sealing of the first negative pressure chamber 4.

[0045] The negative pressure cover 2 is provided with a gripping portion 21. The gripping portion 21 is used to cooperate with a finger cylinder or other equipment to grip or move the negative pressure cover 2 to achieve automated production and processing.

[0046] This embodiment also provides a welding device, including a frame (not shown in the figure), a laser welding head (not shown in the figure) and the aforementioned negative pressure adsorption fixture, wherein the laser welding head and the negative pressure adsorption fixture are both assembled on the frame. Based on the negative pressure adsorption fixture, the welding device has high processing efficiency.

[0047] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A negative pressure adsorption fixture, characterized in that: include: An adsorption plate (1) is provided with an adsorption surface (100), wherein the adsorption surface (100) is provided with a first negative pressure port (101) and a second negative pressure port (102), wherein the first negative pressure port (101) is used for adsorbing a lower layer workpiece (31); A negative pressure cover (2) is arranged corresponding to the second negative pressure port (102); the upper workpiece (32) is located between the negative pressure cover (2) and the adsorption surface (100); a first negative pressure cavity (4) is formed between the negative pressure cover (2) and the upper workpiece (32); and the second negative pressure port (102) passes through the lower workpiece (31) and the upper workpiece (32) in sequence and is connected to the first negative pressure cavity (4); A negative pressure source is connected to the first negative pressure port (101) and the second negative pressure port (102).

2. The negative pressure adsorption fixture according to claim 1, characterized in that: The adsorption plate (1) comprises a top plate (10), the adsorption surface (100) is arranged on a first side surface of the top plate (10), a first sealing plate (11) is arranged on a second side surface of the adsorption plate (1), the first side surface and the second side surface are arranged opposite to each other, a second negative pressure chamber (5) is formed between the first sealing plate (11) and the second side surface, and the second negative pressure port (102) is opened on the top plate (10) and is connected to the second negative pressure chamber (5); A first air guide hole (107) is provided on the top plate (10) and / or the first sealing plate (11), one end of the first air guide hole (107) is connected to the negative pressure source, and the other end of the first air guide hole (107) is connected to the second negative pressure chamber (5).

3. The negative pressure adsorption fixture according to claim 2, characterized in that: A first groove (110) is provided on the second side surface of the top plate (10) and / or the side surface of the first sealing plate (11) facing the top plate (10), and the first groove (110) is used to form the second negative pressure chamber (5).

4. The negative pressure adsorption fixture according to claim 2, characterized in that: The adsorption plate (1) further comprises a bottom plate (12) and a second sealing plate (13), wherein the first sealing plate (11) is located between the second sealing plate (13) and the top plate (10), and the second sealing plate (13) is located between the bottom plate (12) and the top plate (10); The first negative pressure port (101) is opened on the top plate (10), and the second sealing plate (13) is provided with a first air vent (131) corresponding to and communicating with the first negative pressure port (101); A third negative pressure chamber (6) is formed between the bottom plate (12) and the second sealing plate (13), and the third negative pressure chamber (6) is connected to the first negative pressure port (101) through the first air vent (131); The bottom plate (12) is provided with a second air guide hole (125), one end of the second air guide hole (125) is connected to the negative pressure source, and the other end of the second air guide hole (125) is connected to the third negative pressure chamber (6).

5. The negative pressure adsorption fixture according to claim 4, characterized in that: A second groove (104) is provided on the second side surface of the top plate (10), the first sealing plate (11) is embedded in the second groove (104), and the first air guide hole (107) is provided on the top plate (10); A third groove (124) is provided on one side of the bottom plate (12) facing the top plate (10), and the second sealing plate (13) is embedded in the third groove (124).

6. The negative pressure adsorption fixture according to claim 5, characterized in that: An inner ring groove (121) and an outer ring groove (122) are provided at the bottom of the third groove (124); the outer ring groove (122) is arranged around the inner ring groove (121); a sealing ring convex (123) is formed between the inner ring groove (121) and the outer ring groove (122); the inner ring groove (121) is used to form the third negative pressure chamber (6); the sealing ring convex (123) is attached to the second sealing plate (13); the first air vent (131) is connected to the inner ring groove (121); and one end of the second air guide hole (125) extends to the inner ring groove (121).

7. The negative pressure adsorption fixture according to claim 6, characterized in that: An air guiding notch (127) corresponding to and communicating with the first air vent (131) is provided on the side wall of the inner annular groove (121).

8. The negative pressure adsorption fixture according to claim 7, characterized in that: The air guide notch (127) extends toward the interior of the area surrounded by the inner annular groove (121).

9. The negative pressure adsorption fixture according to claim 1, characterized in that: A side surface of the negative pressure cover (2) facing the adsorption surface (100) is configured as a pressing surface (22), and a fourth groove (221) is provided on the pressing surface (22), and the fourth groove (221) is used to form the first negative pressure chamber (4); A first positioning pin (103) is provided on the adsorption surface (100), a positioning protrusion (222) is provided at the bottom of the fourth groove (221), and a third positioning hole (223) adapted to the first positioning pin (103) is provided on the positioning protrusion (222).

10. A welding device, characterized in that: It comprises a frame, a laser welding head and the negative pressure adsorption fixture as described in any one of claims 1 to 9, wherein the laser welding head and the negative pressure adsorption fixture are both assembled on the frame.

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