Multi-point adsorption clamp for thin-wall metal plate machining based on visual positioning

Abstract

The invention discloses a multi-point adsorption clamp for thin-wall metal plate machining based on visual positioning. The multi-point adsorption clamp comprises a base, a vacuum suction cup, a vacuum pipe and a vacuum suction hole adjusting mechanism. A plurality of positioning blocks are further arranged on the vacuum chuck, a groove is formed in the top surface of the vacuum chuck, and a visual camera is mounted on the base; by arranging the vacuum suction hole adjusting mechanism, when no workpiece is placed and adsorbed, the vacuum suction hole is closed in a self-adjusting mode, the workpiece can be placed on the vacuum suction cup at will, and multi-point vacuum adsorption can be formed; by designing the lateral positioning block, the thin-wall metal plate can be stably positioned in cooperation with the high-strength adsorption non-deformation positioning block under conventional adsorption, by arranging the groove, an avoiding space can be provided when the thin-wall metal plate is machined, the visual camera is connected with an external control center, position information of the visual camera can be fed back, and the machining precision of the thin-wall metal plate is improved. And the control center controls the machining execution mechanism to carry out adaptive precise machining according to the feedback position information.

Description

Technical Field

[0001] The present invention belongs to the technical field of visual positioning fixtures, and in particular relates to a multi-point adsorption fixture for processing thin-walled metal plates based on visual positioning. Background Art

[0002] The processing of thin-walled metal sheets is very common in the industrial field, such as thin-walled parts made of aluminum alloy and titanium alloy, including in the automotive manufacturing field, where lightweight and rigid body covers, chassis parts, and battery housings are required; in the electronic and electrical field, precision parts such as mobile phone / computer casings, heat sinks, and battery housings; in the medical device field, surgical instruments and imaging equipment components with high requirements for precision and hygiene; in the architectural decoration field, curtain walls and metal decorative panels that require a combination of beauty and functionality are required.

[0003] At present, when processing thin-walled metal sheets, such as grinding, cutting, drilling, grooving, etc., it is necessary to use a clamp for positioning, and the positioning method includes clamping clamp positioning. For example, the Chinese patent document with the authorization announcement number CN 113967805 B discloses an ultra-thin metal plate laser welding clamping device, in which a driving mechanism is started by an external device, the driving mechanism drives the triangular thrust plate to rotate, and the triangular thrust plate drives the clamping part to work, so that the clamping part applies a force to the workbench to press the material to be welded placed on the support plate.

[0004] Considering that thin-walled metal sheets are prone to damage when they are pressed and positioned, vacuum suction cups are currently used for adsorption and positioning. However, the vacuum suction cups still have the following shortcomings in actual work: 1. It is difficult for the vacuum suction cups to be positioned according to the corresponding arrangement of different products, especially the side positioning ability is poor; 2. When processing thin-walled metal sheets, the thickness of thin-walled metal sheets is small and easy to deform. The negative pressure suction force is large and easy to cause the thin-walled metal sheets to deform. Only conventional negative pressure suction can be selected. At the same time, considering the sealing performance during contact, the surface of the vacuum suction cup is flat and smooth, and it is easy to slide. Therefore, when processing the workpiece, such as grinding and surface grooving, it is easy to slide in the lateral and rotational directions; 3. At present, conventional vacuum suction cups are flat structures with suction holes on the surface. They can generally only perform grinding and other processing work that does not interfere with the vacuum suction cup. When through grooving, drilling and other work are required, the vacuum suction cup cannot avoid, and the scope of application is small; 4. The workpiece position information cannot be fed back, and it is difficult to perform adaptive precision processing, and the workpiece processing damage rate is high. Summary of the invention

[0005] The present invention provides a multi-point adsorption fixture for processing thin-walled metal plates based on visual positioning. By setting a vacuum suction hole adjustment mechanism, the vacuum suction hole self-adjusts and closes when there is no workpiece placed for adsorption. The workpiece can be placed arbitrarily on the vacuum suction cup, and multi-point vacuum adsorption can be formed. By designing lateral positioning blocks, thin-walled metal plates can be stably positioned under conventional adsorption with the help of high-strength adsorption and non-deformation positioning blocks, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning, comprising a base, the base is used for support, and includes a bottom support plate and an upper enclosure; the enclosure forms a cavity in the middle and is open at the top; A vacuum suction cup, which is a flat plate, is placed flat on the surrounding plate of the base and fixed by screws. A plurality of vacuum suction holes are opened on the upper part of the vacuum suction cup, and the vacuum suction holes communicate with the vacuum cavity enclosed by the base and the vacuum suction cup; A vacuum tube, wherein the vacuum tube is provided with a joint connected to the enclosure of the base, the joint is connected to the vacuum chamber, and the other end of the vacuum tube is connected to a negative pressure vacuum pump; The vacuum suction hole adjustment mechanism forms multi-point vacuum adsorption by self-adjusting and closing the vacuum suction hole when there is no workpiece placed for adsorption.

[0007] Preferably, the vacuum suction hole adjustment mechanism includes a stepped groove located in the vacuum suction hole, the stepped groove includes at least three steps, the diameters of the three steps decrease successively from top to bottom, a filter screen is placed at the top, a pipe sleeve is placed in the middle, the outer wall of the pipe sleeve is close to the inner wall of the stepped groove, a through cavity is arranged in the middle of the pipe sleeve, a spring is installed in the lowest stepped groove, the bottom end of the spring is fixed in the groove, the spring is placed vertically, the outer diameter of its spiral is smaller than the inner diameter of the through cavity, a piston column is also sleeved in the spring, a stopper is provided at the top of the piston column, the outer diameter of the piston column is smaller than the inner diameter of the spiral of the spring, the outer diameter of the stopper is larger than the inner diameter of the through cavity, and the spring elastically lifts the piston column upward to separate it from the pipe sleeve; a connecting hole is provided at the lower part of the stepped groove, and the diameter of the connecting hole is smaller than the diameter of the lowest stepped groove.

[0008] Preferably, a positioning mechanism is also provided on the vacuum suction cup, and the positioning mechanism includes a plurality of positioning blocks, and the bottom surface of the positioning blocks is flat, so that when placed on the vacuum suction cup, the positioning of the thin-walled metal sheet will be fixed by the vacuum suction cup, thereby strengthening the side positioning of the thin-walled metal sheet.

[0009] Preferably, the structures of the positioning blocks are the same, and both include a positioning block suction cup and a top plate. The positioning block suction cup and the inside of the top plate form a second vacuum chamber. A second vacuum tube is fixed on one side of the top plate. The second vacuum tube is provided with a second joint connected to the second vacuum chamber. The other end of the second vacuum tube is connected to another negative pressure vacuum pump, so that the second vacuum chamber is sucked into vacuum when the negative pressure vacuum pump is working.

[0010] Preferably, a vacuum suction hole adjustment mechanism is also provided in the second vacuum chamber and is arranged in the opposite direction to the vacuum suction hole adjustment mechanism of the vacuum suction cup.

[0011] Preferably, the suction force of the vacuum suction hole of the positioning block suction cup is greater than the suction force of the vacuum suction hole of the vacuum suction cup, and the positioning block is made of high-hardness wear-resistant alloy material, and generates stronger adsorption force through its own vacuum suction hole.

[0012] Preferably, the second vacuum tubes of different positioning blocks are connected to one pipeline and then perform vacuum operation through the same negative pressure vacuum pump.

[0013] Preferably, a groove is provided on the top surface of the vacuum suction cup.

[0014] Preferably, the positioning block can be placed in a groove, and vacuum holes are also distributed in the groove, and at the same time, a protrusion of corresponding thickness is performed on the bottom of the vacuum suction cup at the corresponding groove.

[0015] Preferably, a fixing rod is fixed on one side of the base, the top of the fixing rod is fixed by a mounting plate, a visual camera is installed below the mounting plate, the visual camera is tilted downward toward the vacuum suction cup, the visual camera is connected to an external control center, and it captures an image of the processed workpiece and feeds back the position of the workpiece to the control center. The control center controls the processing actuator to perform adaptive precision processing based on the feedback position information.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up the vacuum suction hole adjustment mechanism, when there is no workpiece placed for adsorption, the vacuum suction hole will automatically adjust and close. The workpiece can be placed arbitrarily on the vacuum suction cup, and multi-point vacuum adsorption can be formed; and metal plates of different sizes and structures can be positioned by multi-point vacuum adsorption.

[0017] 2. By designing lateral positioning blocks, the positioning blocks are made of high-hardness and wear-resistant alloy material, which can generate stronger adsorption force through their own vacuum suction holes, so that thin-walled metal sheets can be stably positioned under conventional adsorption with the high-strength adsorption and non-deformed positioning blocks. Compared with the conventional fixing by cylinder clamps on the four sides, this positioning will not damage the workpiece, especially the thin-walled sheet, so as to protect the workpiece while achieving stable positioning.

[0018] 3. The positioning blocks on the four sides can make the workpiece be placed adaptively in any direction on the vacuum suction cup; and the processing of different workpieces can be adaptively placed, which is more flexible and changeable.

[0019] 4. By setting grooves, avoidance space can be provided when processing thin-walled metal sheets, greatly expanding the processing space, such as through grooving and drilling.

[0020] 5. The visual camera is connected to the external control center. It captures the image of the workpiece and identifies the position of the workpiece. No matter where the workpiece is placed, it can provide feedback on its position information. The control center then controls the machining actuator to perform adaptive and precise machining based on the feedback position information.

[0021] 6. Visual positioning is performed through visual cameras. Even in extreme cases, when the circular workpiece is displaced in the direction of rotation, the position of the workpiece in the control center is fed back in real time. When the workpiece deviates during processing, feedback is provided and adjustments are made to further reduce the breakage rate of the workpiece during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the main cross-sectional structure of the present invention; Figure 2 for Figure 1 A schematic diagram of the enlarged structure at point A; Figure 3 It is a schematic diagram of the main structure of the present invention; Figure 4 It is a schematic diagram of the cross-sectional structure of the positioning block of the present invention; Figure 5 It is a schematic diagram of a top view of a square thin-walled metal plate positioning structure according to an embodiment of the present invention; Figure 6 A schematic top view of a square thin-walled metal plate product according to an embodiment of the present invention; Figure 7 It is a schematic diagram of the top view of the groove structure of the present invention; Figure 8 It is a schematic diagram of a top view of a circular thin-walled metal plate positioning structure according to an embodiment of the present invention; Fig. 9 It is a top view schematic diagram of a circular thin-walled metal plate product according to an embodiment of the present invention.

[0023] In the figure: 1. base; 101. bottom support plate; 102. enclosure; 2. vacuum suction cup; 201. vacuum suction hole; 202. vacuum chamber; 203. groove; 3. vacuum tube; 301. joint; 401. filter screen; 402. sleeve; 4021. through cavity; 403. spring; 404. piston column; 4041. stopper; 405. connecting hole; 5. positioning block; 501. positioning block suction cup; 502. top plate; 503. second vacuum chamber; 504. second vacuum tube; 5041. second joint; 6. fixing rod; 601. mounting plate; 7. visual camera. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1 The present invention provides a multi-point adsorption fixture for processing thin-walled metal plates based on visual positioning, comprising Base 1 is used for support, and includes a bottom support plate 101 and an upper enclosure 102. The shape of the bottom support plate 101 is set according to actual needs, and generally includes mounting holes on the edge for fixing or connecting external mechanisms; the enclosure 102 encloses a cavity in the middle and has an opening at the top for connecting the upper vacuum suction cup.

[0026] The vacuum suction cup 2 is a flat plate, which is placed flat on the enclosure 102 of the base 1 and fixed by screws. Generally, a circle of sealing groove is set at the connection between the enclosure 102 and the vacuum suction cup 2, and a sealing ring is installed in the sealing groove, whose function is to improve the sealing of the connection to prevent air leakage during negative pressure vacuum adsorption and affect adsorption and fixation; a plurality of vacuum suction holes 201 are opened on the upper part of the vacuum suction cup 2, and the vacuum suction holes 201 are connected to the vacuum cavity 202 enclosed by the base 1 and the vacuum suction cup 2, so that when the vacuum cavity 202 generates negative pressure vacuum suction, the workpiece placed above can be stably adsorbed through the vacuum suction holes 201.

[0027] The vacuum tube 3 is provided with a joint 301 connected to the enclosure 102 of the base 1, the joint is connected to the vacuum chamber 202, and the other end of the vacuum tube 3 is connected to a negative pressure vacuum pump, so that when the negative pressure vacuum pump is working, the vacuum chamber 202 is vacuumed to position the workpiece above.

[0028] The vacuum suction hole adjustment mechanism can self-adjust and close the vacuum suction hole 201 when there is no workpiece placed for adsorption. The workpiece can be placed arbitrarily on the vacuum suction cup 2, and multi-point vacuum adsorption can be formed.

[0029] See also Figure 2 As an embodiment of the present invention, the vacuum suction hole adjustment mechanism includes a stepped groove located in the vacuum suction hole, the stepped groove includes at least three steps, the diameters of the three steps decrease from top to bottom, a filter 401 is placed at the top to prevent external dust particles from entering the vacuum suction hole 201 and clogging it, and regular cleaning is performed, the filter 401 is fixed by conventional methods such as gluing or screwing, a pipe sleeve 402 is placed in the middle, an annular groove is set on the outer wall of the pipe sleeve 402, and a sealing ring is installed in the annular groove, the function of the sealing ring is to improve the sealing performance of the contact between the pipe sleeve 402 and the stepped groove, A through cavity 4021 is provided in the middle of the sleeve 402, and a spring 403 is installed in the lowest stepped groove. The bottom end of the spring 403 can be fixed in the groove by conventional means such as gluing and welding. The spring 403 is placed vertically, and its spiral outer diameter is smaller than the inner diameter of the through cavity 4021. A piston column 404 is also sleeved in the spring 403, and a stopper 4041 is provided on the top of the piston column 404. The outer diameter of the piston column 404 is smaller than the spiral inner diameter of the spring 403, and the outer diameter of the stopper 4041 is larger than the inner diameter of the through cavity 4021, that is, the cross section of the piston column 404 and the stopper 4041 is a T-shaped structure. The spring 403 elastically lifts the piston rod 404 upward to separate from the sleeve 402. When the piston rod 404 descends, the stopper 4041 can contact the sleeve 402 to seal the upper part of the through cavity 4021. A connecting hole 405 is provided at the lower part of the stepped groove. The diameter of the connecting hole 405 is smaller than the diameter of the lowest stepped groove, so that the connecting hole 405 connects the vacuum suction hole 201 to the vacuum cavity 202, and does not affect the installation of the spring 43 in the lowest stepped groove. By setting the vacuum suction hole adjustment mechanism, if a single vacuum suction hole 201 is not covered by the workpiece, the negative pressure will be generated at the moment of covering. A pressure difference is formed on the upper and lower sides of the cover, and the stopper 4041 will be instantly sucked onto the tube sleeve 402 below to block the through cavity 4021 of the tube sleeve 402; and the vacuum suction hole 201 covered by the workpiece generates negative pressure at the moment, because the vacuum suction hole 201 is covered by the workpiece, the negative pressure will continue to pass through the stopper 4041 to reach the bottom of the workpiece, forming a pressure difference on the upper and lower sides of the workpiece, and this hole generates suction, so that the workpiece can be placed arbitrarily on the vacuum suction cup 2, and multi-point vacuum adsorption can be formed; and metal plates of different sizes and structures can be positioned by multi-point vacuum adsorption.

[0030] See also Figure 3As an embodiment of the present invention, a positioning mechanism is also provided on the vacuum suction cup 2, and the positioning mechanism includes a plurality of positioning blocks 5. The number of the positioning blocks 5 is generally at least three, and multi-directional side positioning is performed. The present application selects four positioning blocks 5, and the bottom surface of the positioning blocks 5 is flat, so when placed on the vacuum suction cup 2, it will be fixed by the vacuum suction cup 2, which can strengthen the side positioning of thin-walled metal sheets.

[0031] See also Figure 4 As an embodiment of the present invention, the structures of the positioning blocks 5 are the same, and they all include a positioning block suction cup 501 and a top plate 502. The positioning block suction cup 501 and the top plate 502 form a second vacuum chamber 503. A second vacuum tube 504 is fixed on one side of the top plate 502. The second vacuum tube 504 is provided with a second connector 5041 connected to the second vacuum chamber 503. The other end of the second vacuum tube 504 is connected to another negative pressure vacuum pump, so that the second vacuum chamber 503 is vacuumed when the negative pressure vacuum pump is working.

[0032] See also Figure 4 As an embodiment of the present invention, a vacuum suction hole adjustment mechanism is also provided in the second vacuum chamber 503, and is arranged in the opposite direction to the vacuum suction hole 201 adjustment mechanism of the vacuum suction cup 2; therefore, when the positioning block 5 generates negative pressure through the negative pressure vacuum pump, it will be tightly sucked with the vacuum suction cup 2 at the bottom, and at the same time, when the second negative pressure vacuum pump generates negative pressure, the fixation of the vacuum suction cup 2 and the positioning block 5 will be further enhanced.

[0033] See also Figure 4As an embodiment of the present invention, the negative pressure suction forces generated by the two negative pressure vacuum pumps at the corresponding vacuum suction holes 201 are different. The vacuum suction hole 201 suction force of the positioning block suction cup 501 is greater than the vacuum suction hole 201 suction force of the vacuum suction cup 2. The positioning block 5 is made of high hardness and wear-resistant alloy. When processing thin-walled metal plates, although there are vacuum suction holes 201 for adsorption, the negative pressure suction force of the vacuum suction holes 201 is generally small. The thickness of thin-walled metal plates is small and easy to deform. A large negative pressure suction force is easy to cause deformation of thin-walled metal plates. Only conventional negative pressure suction force can be selected. At the same time, considering the sealing during contact, the surface of the vacuum suction cup is flat and smooth and easy to slide. Therefore, when processing the workpiece, such as grinding, surface grooving, etc., lateral and rotational directions are prone to occur. Sliding; the present application designs a lateral positioning block 5, and the positioning block 5 is made of high-hardness and wear-resistant alloy material. It can generate a stronger adsorption force through its own vacuum suction hole 201, and the adsorption of the two-way double vacuum suction holes can achieve stability and non-deformation while performing more stable adsorption, so that thin-walled metal sheets can be stably positioned under conventional adsorption with the high-strength adsorption and non-deformation positioning block 5, and compared with the conventional fixation by the cylinder clamps on the four sides, this positioning will not damage the workpiece, especially the thin-walled sheet, so as to protect the workpiece and perform stable positioning; at the same time, the positioning blocks 5 on the four sides can make the workpiece adaptively placed when placed in any direction on the vacuum suction cup 2; and the processing of different workpieces can be adaptively placed, which is more flexible and changeable.

[0034] See also Figure 5-Figure 6 As an embodiment of the present invention, the second vacuum tubes 504 of different positioning blocks 5 are connected to a pipeline, and then vacuum work is performed through the same negative pressure vacuum pump, and only one negative pressure vacuum pump is used to perform synchronous positioning control on all positioning blocks 5.

[0035] See also Figure 7 As an embodiment of the present invention, a groove 203 is provided on the top surface of the vacuum suction cup 2. The shape and size of the groove 203 are set according to actual processing needs. By setting the groove 203, an avoidance space can be provided when processing thin-walled metal sheets. At present, conventional vacuum suction cups 2 are flat structures with suction holes on the surface, which can generally only be used for grinding and other processing work that does not interfere with the vacuum suction cup 2. When through grooving, drilling and other work are required, the vacuum suction cup 2 cannot avoid. The groove 203 design of the vacuum suction cup 2 of the present application greatly expands the processing space, such as through grooving, drilling and the like.

[0036] See also Figure 1 , Figure 7 As an embodiment of the present invention, the positioning block 5 can be placed in the groove 203, so that when the workpiece is placed, even if the edge is above the groove 203 and the positioning block 5 needs to be placed entirely in the groove 203, it can be placed adaptively, which is more flexible; Furthermore, vacuum suction holes 201 are also distributed in the groove 203, so that the groove 203 can be arranged in various shapes as needed, and the vacuum suction holes 201 will not interfere with the arrangement of the groove 203. At the same time, a protrusion of corresponding thickness is provided at the bottom of the vacuum suction cup 2 at the corresponding groove 203, so as not to affect the normal arrangement of the vacuum suction hole adjustment mechanism at the vacuum suction hole 201.

[0037] See also Figure 1 , Figure 3 , Figure 8-Figure 9 As an embodiment of the present invention, a fixing rod 6 is fixed on one side of the base 1, and the top of the fixing rod 6 is fixed by a mounting plate 601. A visual camera 7 is installed below the mounting plate 601. A high-resolution industrial camera is selected. The visual camera 7 is tilted downward toward the vacuum suction cup 2. The visual camera 7 is connected to an external control center. It captures the image of the processed workpiece and performs conventional image processing algorithms, such as edge detection calculations, etc., to extract information such as the edge, hole, and surface groove of the workpiece, and perform coordinate system positioning. Then, the position of the workpiece is fed back to the control center for further precise positioning, and feedback is provided when there is a position deviation during workpiece processing. On the basis of identifying the position of the workpiece, the position information of the workpiece can be fed back regardless of the direction in which the workpiece is placed. Then, the control center controls the processing actuator to perform adaptive precise processing based on the feedback position information.

[0038] If the workpiece is a circular plate with a relatively smooth outer edge, when it is positioned on the four sides, in extreme cases, there is still room for displacement in the rotation direction. Visual positioning is performed by the visual camera 7. Even in extreme cases, when the circular workpiece is displaced in the rotation direction, real-time feedback is provided to control the position of the workpiece in the center. Feedback is provided when there is position deviation during workpiece processing, and adjustment processing is performed to further reduce the breakage rate of the workpiece during processing.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning, comprising a base (1), characterized in that: The base (1) is used for support, and comprises a bottom support plate (101) and an upper enclosure plate (102); the enclosure plate (102) encloses a cavity in the middle and is open at the top; A vacuum suction cup (2), wherein the vacuum suction cup (2) is a flat plate, which is flatly placed on the enclosure (102) of the base (1) and fixed by screws, and a plurality of vacuum suction holes (201) are provided on the upper part of the vacuum suction cup (2), and the vacuum suction holes (201) are connected to a vacuum cavity (202) enclosed by the base (1) and the vacuum suction cup (2); A vacuum tube (3), the vacuum tube (3) being provided with a joint (301) connected to the enclosure (102) of the base (1), the joint being connected to the vacuum chamber (202), and the other end of the vacuum tube (3) being connected to a negative pressure vacuum pump; The vacuum suction hole adjustment mechanism forms multi-point vacuum suction by self-adjusting and closing the vacuum suction hole (201) when no workpiece is placed for suction.

2. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 1 is characterized in that: The vacuum suction hole adjustment mechanism comprises a stepped groove located in the vacuum suction hole, the stepped groove comprises at least three steps, the diameters of the three steps decrease from top to bottom, a filter screen (401) is placed at the top, a pipe sleeve (402) is placed in the middle, the outer wall of the pipe sleeve (402) is in close contact with the inner wall of the stepped groove, a through cavity (4021) is arranged in the middle of the pipe sleeve (402), a spring (403) is arranged in the bottom stepped groove, the bottom end of the spring (403) is fixed in the groove, the spring (403) is placed vertically, and the outer diameter of the spiral is smaller than the through cavity (402 1), a piston column (404) is also sleeved in the spring (403), a stopper (4041) is provided at the top of the piston column (404), the outer diameter of the piston column (404) is smaller than the spiral inner diameter of the spring (403), the outer diameter of the stopper (4041) is larger than the inner diameter of the through cavity (4021), and the spring (403) elastically lifts the piston column (404) upward to separate from the sleeve (402); a connecting hole (405) is provided at the lower part of the stepped groove, and the diameter of the connecting hole (405) is smaller than the diameter of the lowest stepped groove.

3. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 1 is characterized in that: A positioning mechanism is also provided on the vacuum suction cup (2), the positioning mechanism comprising a plurality of positioning blocks (5), the bottom surfaces of the positioning blocks (5) being flat, so that when placed on the vacuum suction cup (2), they will be fixed by the vacuum suction cup (2), thereby strengthening the side positioning of the thin-walled metal sheet.

4. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 3 is characterized in that: The structures of the positioning blocks (5) are the same, and they all include a positioning block suction cup (501) and a top plate (502); the positioning block suction cup (501) and the top plate (502) form a second vacuum chamber (503) inside; a second vacuum tube (504) is fixed on one side of the top plate (502); the second vacuum tube (504) is provided with a second joint (5041) connected to the second vacuum chamber (503); the other end of the second vacuum tube (504) is connected to another negative pressure vacuum pump, so that when the negative pressure vacuum pump is working, the second vacuum chamber (503) is vacuumed.

5. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 4 is characterized in that: A vacuum suction hole adjustment mechanism is also provided in the second vacuum chamber (503), and is arranged in the opposite direction to the vacuum suction hole (201) adjustment mechanism of the vacuum suction cup (2).

6. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 5 is characterized in that: The suction force of the vacuum suction hole (201) of the positioning block suction cup (501) is greater than the suction force of the vacuum suction hole (201) of the vacuum suction cup (2); the positioning block (5) is made of a high-hardness wear-resistant alloy material and generates a stronger suction force through its own vacuum suction hole (201).

7. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 6 is characterized in that: The second vacuum tubes (504) of different positioning blocks (5) are all connected to a pipeline and then perform vacuum operation via the same negative pressure vacuum pump.

8. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 1 is characterized in that: The top surface of the vacuum suction cup (2) is provided with a groove (203).

9. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 8, characterized in that: The positioning block (5) can be placed in the groove (203), and the groove (203) is also provided with vacuum suction holes (201), and at the same time, a protrusion of a corresponding thickness is formed on the bottom of the vacuum suction cup (2) at the corresponding groove (203).

10. The multi-point adsorption fixture for processing thin-walled metal sheets based on visual positioning according to claim 1, characterized in that: A fixing rod (6) is fixed on one side of the base (1), and the top of the fixing rod (6) is fixed by a mounting plate (601). A visual camera (7) is installed below the mounting plate (601). The visual camera (7) is tilted downward toward the vacuum suction cup (2). The visual camera (7) is connected to an external control center, and feeds back the position of the workpiece to the control center by capturing an image of the workpiece to be processed. The control center controls the processing actuator to perform adaptive precision processing based on the feedback position information.

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