Negative pressure sucker

Abstract

The negative-pressure suction cup comprises a suction cup body and a center base plate, an installation support is arranged at the upper end of the suction cup body, a concave space with an opening in the lower end is formed in the center of the suction cup body, the center base plate is fixedly installed in the concave space of the suction cup body, and a cavity is defined between the center base plate and the suction cup body; the suction cup body is provided with a first connector communicated with the cavity, the first connector is used for being connected with a vacuum pump, the center base plate comprises a base plate part and a plurality of protruding parts arranged at the upper end of the base plate part, the protruding parts are annularly arranged at the upper end of the base plate part, and a spacing groove is formed between every two adjacent protruding parts. An annular gap is formed between the periphery of the concave space of the suction cup body and the periphery of the center base plate, the annular gap is communicated with the cavity through the interval groove, the suction cup body is provided with a plurality of vacuum breaking holes, and the suction cup body is provided with a second connector communicated with the vacuum breaking holes. And an adsorbed workpiece is easily interfered.

Description

Technical Field

[0001] The invention relates to the technical field of industrial automation suction cups, and in particular to a negative pressure suction cup. Background Art

[0002] The current Bernoulli suction cup usually has a single jet nozzle in the center as the suction cup core, which is clamped with the mounting hole, and the gap between the suction cup core and the mounting hole is used to form a high-speed airflow gap, and the airflow is discharged from the side of the suction cup core. Therefore, due to the limitation of the suction cup core area, it cannot suck up workpieces with larger areas. For this reason, technicians have designed a Bernoulli suction cup (authorization announcement number CN218753558U), which replaces the suction cup core that sprays gas in the center with a first jet nozzle arranged in a ring around the suction cup core. The arrangement shape of the first jet nozzle is adapted to the shape of the workpiece to be sucked, which facilitates the suction of workpieces of different shapes and areas.

[0003] During the suction process, compressed gas is introduced into the air supply connector, and the compressed gas is ejected from the air outlet on the side wall of the suction cup core toward the annular groove, forming a high-speed airflow gap in the annular groove. Since the gas flow rate during the discharge process is relatively fast, according to Bernoulli's principle, the faster the gas flow rate, the smaller the pressure, so that a pressure difference is formed on both sides of the workpiece to be sucked, thereby forming a vacuum between the bottom of the suction cup body and the workpiece to suck the workpiece.

[0004] When the Bernoulli suction cup is working, it is necessary to discharge the compressed gas, and the discharged compressed gas will interfere with the workpiece (such as a silicon wafer) adsorbed on the Bernoulli suction cup. That is, the workpiece adsorbed on the Bernoulli suction cup is easily blown off when the high-speed compressed gas is discharged. In addition, the high-speed compressed gas produces a large noise when it is discharged from the small-aperture outlet. Therefore, the existing suction cup needs to be improved. Summary of the invention

[0005] The purpose of the present invention is to provide a negative pressure suction cup, which solves the problem that the original positive pressure gas has a large noise and is easy to interfere with the adsorbed workpiece.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a negative pressure suction cup, comprising a suction cup body and a central chassis, the upper end of the suction cup body is provided with a mounting bracket, the center of the suction cup body is provided with a recessed space with an opening at the lower end, the central chassis is fixedly installed in the recessed space position of the suction cup body, a chamber is enclosed between the central chassis and the suction cup body, the suction cup body is provided with a first joint connected to the chamber, the first joint is used to connect a vacuum pump, the central chassis comprises a chassis portion and a plurality of raised portions arranged at the upper end of the chassis portion, the plurality of raised portions are arranged in a ring shape at the upper end of the chassis portion, a spacing groove is provided between adjacent raised portions, an annular gap is formed between the outer periphery of the recessed space of the suction cup body and the outer periphery of the central chassis, the annular gap is connected to the chamber through the spacing groove, the outer periphery of the recessed space of the suction cup body corresponding to the suction cup body is provided with a plurality of vacuum breaking holes, and the upper end of the suction cup body is provided with a second joint connected to the vacuum breaking holes.

[0007] Furthermore, the outer periphery of the suction cup body corresponding to the recessed space is configured as an expanded structure with a smaller upper portion and a larger lower portion, and a gap is left between the bottom plate portion and the inner wall of the recessed space.

[0008] Furthermore, the outer peripheral portion of the upper end of the chassis portion is arranged to be a chamfered structure, and the chamfered surface faces one side of the annular gap.

[0009] Furthermore, the upper ends of the plurality of protrusions are provided with assembly holes, the upper end of the suction cup body is connected with a fastener threadedly connected to the assembly hole, and the central chassis is fixedly connected to the recessed space of the suction cup body through the fastener.

[0010] Furthermore, a plurality of first pads are provided at the bottom of the chassis portion, and a plurality of second pads are provided at the bottom of the suction cup body, and the bottoms of the first pads and the second pads are arranged flush with each other.

[0011] Furthermore, the vacuum breaking hole is arranged at the position where the second cushion block is located, and the second cushion block is provided with a connecting hole connected to the vacuum breaking hole.

[0012] Furthermore, a mounting bracket is provided at the upper end of the suction cup body, and the mounting bracket includes a plurality of connecting columns fixedly connected around the suction cup body, and a mounting plate is provided at the upper end of the plurality of connecting columns.

[0013] Furthermore, an upwardly protruding boss portion is provided at the upper end of the suction cup body, and a spare mounting hole is provided at the upper end of the boss portion, so that the suction cup body can be installed to a desired position through the spare mounting hole.

[0014] Furthermore, a plurality of weight-reducing grooves are provided on the periphery of the suction cup body corresponding to the recessed space.

[0015] Furthermore, the inner end of the second cushion block is along the position of the annular gap, and a circulation space is provided between adjacent second cushion blocks, the inner end of the circulation space is connected to the annular gap, and the outer end of the circulation space is connected to the outside.

[0016] In summary, the present invention has the following beneficial effects: The negative pressure suction cup of the present invention evacuates the gas in the annular gap, the spacing groove and the chamber through a vacuum pump connected to the first joint, thereby forming a negative pressure in the annular gap, and utilizes the pressure difference to adsorb the workpiece (such as a silicon wafer), and breaks the vacuum state in the annular gap through the vacuum breaking holes on the periphery of the annular gap, and then lowers the workpiece. By improving the structure of the negative pressure suction cup, the problem that the original positive pressure gas makes a lot of noise and is easy to interfere with the adsorbed workpiece is solved. In addition, the adsorption surface of the suction cup body is set to an unsealed structure, which can prevent the silicon wafer from being damaged due to excessive adsorption pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a bottom view of the present invention.

[0019] Figure 3 It is a cross-sectional view of the present invention.

[0020] Figure 4 The present invention Figure 3 Enlarged view of point A.

[0021] Figure 5 It is a schematic diagram of the bottom structure of the present invention.

[0022] Figure 6 It is a schematic diagram of the recessed space of the suction cup body of the present invention.

[0023] Figure 7 It is a structural schematic diagram of the central chassis of the present invention.

[0024] In the figure: 10, suction cup body; 11, recessed space; 111, expansion structure; 12, chamber; 13, first joint; 14, annular gap; 15, vacuum breaking hole; 16, second joint; 17, second pad; 171, flow space; 18, boss part; 181, spare mounting hole; 19, weight reduction groove; 20, center chassis; 21, chassis part; 211, chamfer structure; 22, raised part; 23, spacing groove; 24, first pad; 30, mounting bracket; 31, connecting column; 32, mounting plate. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] like Figure 1-7 As shown, a negative pressure suction cup comprises a suction cup body 10 and a central chassis 20, wherein a mounting bracket 30 is arranged at the upper end of the suction cup body 10, a recessed space 11 with an opening at the lower end is arranged at the center of the suction cup body 10, and the central chassis 20 is fixedly installed at the position of the recessed space 11 of the suction cup body 10, a chamber 12 is formed between the central chassis 20 and the suction cup body 10, and the suction cup body 10 is provided with a first joint 13 connected to the chamber 12, and the first joint 13 is used to connect a vacuum pump, and the central chassis 20 comprises a chassis portion 21 with a bottom portion 22, and a bottom portion 23 is provided with a bottom portion 24, and a bottom portion 25 is provided with a bottom portion 26. And a plurality of raised portions 22 are arranged at the upper end of the chassis portion 21, and the plurality of raised portions 22 are arranged in a ring shape at the upper end of the chassis portion 21, and spacing grooves 23 are provided between adjacent raised portions 22, and an annular gap 14 is formed between the outer periphery of the recessed space 11 of the suction cup body 10 and the outer periphery of the central chassis 20, and the annular gap 14 is communicated with the chamber 12 through the spacing grooves 23, and the outer periphery of the recessed space 11 of the suction cup body 10 is provided with a plurality of vacuum breaking holes 15, and the upper end of the suction cup body 10 is provided with a second joint 16 connected to the vacuum breaking holes 15.

[0027] When it is necessary to grab the workpiece, the vacuum pump draws air to the first joint 13, so that the gas in the chamber 12, the spacing groove 23 and the annular gap 14 is sucked away by the vacuum pump, so that a negative pressure is formed in the annular gap 14, and the workpiece (such as a silicon wafer) is adsorbed by the pressure difference; when it is necessary to lower the workpiece, positive pressure air is introduced into the second joint 16, and then the vacuum state in the annular gap 14 is broken through the vacuum breaking hole 15. By improving the structure of the negative pressure suction cup, the problem that the original positive pressure gas has a large noise and is easy to interfere with the adsorbed workpiece is solved.

[0028] The outer periphery of the recessed space 11 corresponding to the suction cup main body 10 is configured as an expanding structure 111 which is smaller at the top and larger at the bottom. A gap is left between the bottom plate portion 21 and the inner wall of the recessed space 11. Specifically, the recessed space 11 includes an upper recessed space and a lower recessed space. The diameter of the lower recessed space is larger than the diameter of the upper recessed space, so that a step portion is formed between the upper recessed space and the lower recessed space. The inner wall of the lower recessed space is configured as an outwardly expanding structure, that is, the expanding structure 111 which is smaller at the top and larger at the bottom. As a result, the area of ​​the annular gap 14 is slightly enlarged, so as to better grasp the workpiece. Of course, the above-mentioned expanding structure 111 can also play a role in guiding gas and improve the efficiency of vacuum extraction.

[0029] In some embodiments, the outer periphery of the upper end of the chassis portion 21 is configured as a chamfered structure 211, and the chamfered surface faces the side of the annular gap 14. The chamfered setting plays a role in guiding the airflow, making it easier for the gas in the annular gap 14 to be drawn away by the vacuum pump, thereby improving the efficiency of vacuuming.

[0030] In some embodiments, the upper ends of the plurality of raised portions 22 are provided with assembly holes, and the upper end of the suction cup body 10 is connected with a fastener threadedly connected to the assembly hole, and the center chassis 20 is fixedly connected to the recessed space 11 of the suction cup body 10 by the fastener. In the present invention, the suction cup body 10 is provided with an annular groove at the position corresponding to the fastener. Specifically, the annular groove is arranged at the upper end of the suction cup body 10, and a plurality of mounting holes are arranged at equal angles in the annular groove, and the mounting holes correspond to the assembly holes on the raised portions 22. The mounting holes are through holes, and fasteners are installed in the mounting holes and the assembly holes, and the suction cup body 10 and the center chassis 20 are fixed by the fasteners. The purpose of the present invention is to prevent the protruding fasteners from interfering with the installation of the negative pressure suction cup by setting the annular groove.

[0031] In some embodiments, a plurality of first pads 24 are provided at the bottom of the chassis portion 21, and a plurality of second pads 17 are provided at the bottom of the suction cup body 10, and the bottoms of the first pads 24 and the second pads 17 are arranged flush. Specifically, the first pads 24 and the second pads 17 are both silicone pads, and four groups of first pads 24 are provided at the center of the chassis portion 21, and four groups of first pads 24 are provided around the periphery of the chassis portion 21, wherein the first pads 24 located at the center of the chassis portion 21 are of a quarter-circular structure and are symmetrically distributed at the center of the chassis portion 21, and the first pads 24 located at the periphery of the chassis portion 21 are arranged in an arc shape, and the arc angle thereof is adapted to the periphery of the chassis portion 21, and a plurality of second pads 17 are provided and symmetrically arranged on the bottom circumference of the suction cup body 10, and the first pads 24 and the second pads 17 are used to increase the friction with the workpiece to prevent displacement or falling off.

[0032] In some embodiments, the vacuum breaking hole 15 is disposed at the location of the second cushion block 17 , and the second cushion block 17 is provided with a connecting hole connected to the vacuum breaking hole 15 .

[0033] In some embodiments, the mounting bracket 30 includes a plurality of connecting columns 31 fixedly connected around the suction cup body 10, and a mounting plate 32 is provided at the upper ends of the plurality of connecting columns 31. The connecting columns 31 are threadedly connected to the suction cup body 10 or fixed to the suction cup body 10 by fasteners. The upper ends of the connecting columns 31 are fixedly connected to the mounting plate 32 by fasteners. A mounting hole is provided in the center of the mounting plate 32, and the negative pressure suction cup is installed to the desired position through the mounting hole on the mounting bracket 30.

[0034] In some embodiments, an upwardly protruding boss portion 18 is provided at the upper end of the suction cup body 10, and a spare mounting hole 181 is provided at the upper end of the boss portion 18, so that the suction cup body 10 can be installed to a desired position through the spare mounting hole 181. The purpose of setting the spare mounting hole 181 is that in some specific scenarios, it is impossible to fix it to the desired position through the mounting bracket 30. At this time, the negative pressure suction cup is directly connected to the desired position through the spare mounting hole 181 and the connecting screws.

[0035] The suction cup body 10 is provided with a plurality of weight-reducing grooves 19 on the periphery of the recessed space 11. The weight-reducing grooves 19 are symmetrically arranged on the suction cup body 10. The arrangement of the weight-reducing grooves 19 can effectively reduce the overall mass of the negative pressure suction cup, thereby facilitating flexible grasping.

[0036] The vacuum breaking hole 15 is arranged on one side adjacent to the annular gap 14. Through this arrangement, the vacuum state can be effectively broken to facilitate lowering of the small workpiece.

[0037] The inner end of the second pad 17 extends along the position of the annular gap 14, and a circulation space 171 is provided between adjacent second pads 17. The inner end of the circulation space 171 is connected to the annular gap 14, and the outer end of the circulation space 171 is connected to the outside. The adsorption surface of the suction cup body is set to an unsealed structure, which can prevent the adsorption pressure from being too high and causing damage to the workpiece (such as a silicon wafer).

[0038] In summary, the present invention has the following beneficial effects: In the negative pressure suction cup of the present invention, the gases in the annular gap 14, the spacing groove 23 and the chamber 12 are evacuated by a vacuum pump connected to the first joint 13, so that negative pressure is formed in the annular gap 14, and the pressure difference is used to adsorb the workpiece (such as a silicon wafer), and the vacuum state in the annular gap 14 is broken through the vacuum breaking holes 15 on the periphery of the annular gap 14, and then the small workpiece is lowered. By improving the structure of the negative pressure suction cup, the problem that the original positive pressure gas has a large noise and is easy to interfere with the adsorbed workpiece is solved.

[0039] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A negative pressure suction cup, comprising a suction cup body (10) and a central base (20), wherein a mounting bracket (30) is disposed at the upper end of the suction cup body (10), characterized in that: The center of the suction cup body (10) is provided with a recessed space (11) with an opening at the lower end; the central chassis (20) is fixedly installed at the position of the recessed space (11) of the suction cup body (10); a chamber (12) is enclosed between the central chassis (20) and the suction cup body (10); the suction cup body (10) is provided with a first joint (13) connected to the chamber (12); the first joint (13) is used to connect a vacuum pump; the central chassis (20) comprises a chassis portion (21) and a plurality of protrusions (22) arranged at the upper end of the chassis portion (21); the plurality of protrusions (22) are provided at the upper end of the chassis portion (21); The raised portion (22) is arranged in an annular shape at the upper end of the base portion (21); a spacing groove (23) is provided between adjacent raised portions (22); an annular gap (14) is formed between the outer periphery of the recessed space (11) of the suction cup body (10) and the outer periphery of the central base (20); the annular gap (14) is communicated with the chamber (12) through the spacing groove (23); a plurality of vacuum breaking holes (15) are provided on the outer periphery of the recessed space (11) of the suction cup body (10); and a second joint (16) communicated with the vacuum breaking holes (15) is provided at the upper end of the suction cup body (10).

2. A negative pressure suction cup according to claim 1, characterized in that: The outer periphery of the suction cup body (10) corresponding to the recessed space (11) is configured as an expanded structure (111) that is smaller at the top and larger at the bottom, and a gap is left between the bottom plate portion (21) and the inner wall of the recessed space (11).

3. A negative pressure suction cup according to claim 2, characterized in that: The outer peripheral portion of the upper end of the bottom plate portion (21) is arranged as a chamfered structure (211), wherein the chamfered surface faces one side of the annular gap (14).

4. The negative pressure suction cup according to claim 1, characterized in that: The upper ends of the plurality of protrusions (22) are provided with assembly holes, the upper end of the suction cup body (10) is connected with a fastener threadedly connected to the assembly hole, and the central chassis (20) is fixedly connected to the recessed space (11) of the suction cup body (10) by the fastener.

5. A negative pressure suction cup according to any one of claims 1 to 4, characterized in that: The bottom of the chassis part (21) is provided with a plurality of first cushion blocks (24), and the bottom of the suction cup body (10) is provided with a plurality of second cushion blocks (17), and the bottoms of the first cushion blocks (24) and the second cushion blocks (17) are arranged flush with each other.

6. A negative pressure suction cup according to claim 5, characterized in that: The vacuum breaking hole (15) is arranged at the location of the second cushion block (17), and the second cushion block (17) is provided with a connecting hole connected to the vacuum breaking hole (15).

7. The negative pressure suction cup according to claim 5, characterized in that: The mounting bracket (30) comprises a plurality of connection columns (31) fixedly connected to the periphery of the suction cup body (10), and a mounting plate (32) is provided at the upper ends of the plurality of connection columns (31).

8. A negative pressure suction cup according to claim 7, characterized in that: The upper end of the suction cup body (10) is provided with a boss portion (18) protruding upward, and the upper end of the boss portion (18) is provided with a spare mounting hole (181), so that the suction cup body (10) can be installed to a desired position through the spare mounting hole (181).

9. The negative pressure suction cup according to claim 1, characterized in that: A plurality of weight-reducing grooves (19) are arranged on the outer periphery of the suction cup body (10) corresponding to the recessed space (11).

10. The negative pressure suction cup according to claim 5, characterized in that: The inner end of the second cushion block (17) extends along the position of the annular gap (14), and a circulation space (171) is provided between adjacent second cushion blocks (17), the inner end of the circulation space (171) is connected to the annular gap (14), and the outer end of the circulation space (171) is connected to the outside.

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