Vacuum chuck

Abstract

The utility model relates to the technical field of vacuum suction cups, and provides a vacuum suction cup which comprises a main body, the main body is provided with a suction channel, a first skirt edge is arranged on the main body and used for abutting against the surface of a workpiece, a first vacuum space is formed in the first skirt edge, a flexible bag piece is located in the first vacuum space, and an air cavity is formed in the flexible bag piece. The air cavity is communicated with the suction channel, and after air in the air cavity is pumped out, the size of the flexible bag piece and the size of the air cavity are reduced. According to the technical scheme, the problem that in the prior art, when dust and impurities exist on the surface of an object to be grabbed or the surface of the object is not flat enough, adsorption cannot be achieved or the adsorption stability is poor possibly in the process that the object is grabbed through a vacuum suction cup is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum chuck technical field, specifically, relate to a vacuum chuck. BACKGROUND

[0002] As a kind of object adsorption and handling using atmospheric pressure and vacuum pressure difference, vacuum chuck is widely used in automation production, logistics handling, building installation, precision electronic assembly and multiple fields.Vacuum chuck basic working principle is to generate low pressure area (i.e. vacuum) in the inside of chuck by internal vacuum generating device (such as vacuum pump, vacuum generator), to form a pressure difference between the chuck and the surface of the object to be adsorbed.Due to the action of atmospheric pressure, object is tightly adsorbed on the chuck, so as to realize the gripping and handling of object.When object needs to be released, the vacuum degree in the chuck can be reduced by introducing air or changing vacuum degree to release adsorption state.In the prior art, when facing the surface of the object to be gripped exists dust impurities or the surface of the object is not flat enough, the process of gripping by vacuum chuck may appear unable to adsorb or poor adsorption stability. SUMMARY

[0003] The utility model provides a kind of vacuum chuck, solve the problem of related art in the surface of the object to be gripped exists dust impurities or the surface of the object is not flat enough when facing, the process of gripping by vacuum chuck may appear unable to adsorb or poor adsorption stability.

[0004] The technical scheme of the utility model is as follows:

[0005] A kind of vacuum chuck, for suction in workpiece surface and clamping and fixing workpiece, comprising:

[0006] Main body, the main body has suction passage,

[0007] First skirt, the first skirt is arranged on the main body, the first skirt is used to abut with the surface of the workpiece, first vacuum space is formed in the first skirt,

[0008] Flexible bag piece, the flexible bag piece is located in the first vacuum space, the flexible bag piece has air cavity inside, the air cavity is communicated with the suction passage, after the air in the air cavity is extracted, the volume of the flexible bag piece and the air cavity is reduced.

[0009] As a further technical scheme, further comprising:

[0010] A second skirt is arranged on the main body and located in the first vacuum space, a bottom edge of the second skirt is higher than that of the first skirt, a second vacuum space is formed inside the second skirt, the second skirt abuts against the flexible bag when the volume of the flexible bag increases, and the flexible bag is located in the first vacuum space and the second skirt abuts against the surface of the workpiece when the volume of the flexible bag decreases.

[0011] As a further technical solution, it further comprises:

[0012] An upper ring-shaped frame and a lower ring-shaped frame are arranged on the inner walls of the upper and lower sides of the air cavity, and the upper ring-shaped frame and the lower ring-shaped frame are close to or away from each other with the change of the volume of the flexible bag,

[0013] A first connecting rod is hingedly connected to the upper ring-shaped frame at one end,

[0014] A second connecting rod is hingedly connected to the first connecting rod at one end and to the lower ring-shaped frame at the other end.

[0015] As a further technical solution, it further comprises:

[0016] A first elastic member is arranged on the upper ring-shaped frame at one end and on the lower ring-shaped frame at the other end, and provides a force for the upper ring-shaped frame and the lower ring-shaped frame to move away from each other.

[0017] As a further technical solution, it further comprises:

[0018] An arc-shaped supporting block is arranged on the hinge shaft of the first connecting rod and the second connecting rod, and abuts against the inner wall of the air cavity when the volume of the flexible bag decreases.

[0019] As a further technical solution, the first connecting rod, the second connecting rod and the arc-shaped supporting block jointly form a supporting assembly, and the supporting assembly is arranged in a plurality of circumferential rows.

[0020] As a further technical solution, the suction passage has a suction port, and further comprises a sealing member slidingly arranged in the suction passage, and the sealing member blocks or opens the suction port after sliding.

[0021] As a further technical solution, the sealing member has an extension part and a sliding part, the sliding part is slidingly arranged in the suction passage, and the extension part is located outside the main body, and further comprises a second elastic member arranged on the extension part at one end and on the main body at the other end, and providing a force for the sealing member to move away from the main body.

[0022] As a further technical solution, the first skirt and the second skirt are both circular truncated cone type.

[0023] As a further technical solution, the flexible bag member is oblate spherical.

[0024] The working principle and beneficial effects of the utility model are:

[0025] In the utility model, the main body and the first skirt are set similarly to the prior art, and the workpiece can be gripped and released by the air pressure change in the first vacuum space inside the first skirt. In addition, the flexible bag member is provided, and the flexible bag member is arranged in the first vacuum space. In the present scheme, the air pressure difference in the first vacuum space is not directly pumped to realize the air pressure difference, but the volume of the flexible bag member is reduced by pumping the air in the flexible bag member, and then the pressure in the first vacuum space is weakened. The design can make the pressure change in the first vacuum space more stable. BRIEF DESCRIPTION OF DRAWINGS

[0026] The above characteristics, technical features, advantages and implementation modes of the utility model will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0027] Figure 1 The utility model structure schematic diagram is shown in the figure.

[0028] Figure 2 The utility model internal structure schematic diagram is shown in the figure.

[0029] Figure 3 The Figure 2 The utility model A part local structure schematic diagram is shown in the figure.

[0030] In the figure: main body-1, suction channel-101, suction port-102, first skirt-2, first vacuum space-201, flexible bag member-3, air cavity-301, second skirt-4, second vacuum space-401, upper annular frame-5, lower annular frame-6, first connecting rod-7, second connecting rod-8, first elastic member-9, arc-shaped support block-10, support assembly-1000, sealing member-11, protruding part-1101, sliding part-1102, second elastic member-12. DETAILED DESCRIPTION

[0031] In order to more clearly illustrate the technical scheme of the embodiments of the utility model or the prior art, the specific implementation mode of the utility model will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, and other embodiments can also be obtained.

[0032] For the simplicity of the drawings, only the parts related to the utility model are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0033] In this article, it should be noted that unless otherwise specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0035] Reference Figures 1-3 The embodiment of the utility model provides a vacuum chuck for clamping and fixing workpiece on the surface of workpiece, including main body 1, main body 1 has suction passage 101, first skirt 2 is arranged on main body 1, first skirt 2 is used for abutting with the surface of workpiece, first vacuum space 201 is formed in the inside of first skirt 2, flexible capsule 3 is located in first vacuum space 201, flexible capsule 3 has air cavity 301 in the inside, air cavity 301 is communicated with suction passage 101, after the air in air cavity 301 is extracted, the volume of flexible capsule 3 and air cavity 301 reduces.

[0036] In the embodiment, considering that in the prior art, when the surface of the object to be grabbed is covered with dust and impurities or the surface of the object is not flat enough, the vacuum chuck may not be able to be adsorbed or the adsorption stability may be poor during the grabbing process. The main body 1 and the first skirt 2 in the present scheme are similar to the prior art, and can realize the grabbing and releasing of the workpiece through the pressure change in the first vacuum space 201 inside the first skirt 2. In addition, the flexible capsule 3 is provided, and the flexible capsule 3 is arranged in the first vacuum space 201. In the present scheme, instead of directly extracting the gas in the first vacuum space 201 to realize the pressure difference, the volume of the flexible capsule 3 is reduced by extracting the gas in the flexible capsule 3, and then the pressure in the first vacuum space 201 is weakened. This design can make the pressure change in the first vacuum space 201 more stable.

[0037] Further, the second skirt 4 is arranged on the main body 1 and located in the first vacuum space 201, the bottom edge of the second skirt 4 is higher than that of the first skirt 2, the second skirt 4 forms a second vacuum space 401 inside, the second skirt 4 abuts against the flexible bag 3 when the volume of the flexible bag 3 increases, and the flexible bag 3 is located in the first vacuum space 201 and the second skirt 4 abuts against the surface of the workpiece when the volume of the flexible bag 3 decreases.

[0038] In the embodiment, the second skirt 4 is arranged in the first vacuum space 201 in addition to the first skirt 2, the double-layered skirts of the first skirt 2 and the second skirt 4 can enhance the suction effect, and the volume change of the flexible bag 3 caused by the change of air pressure can effectively avoid the instability of the pressure in the second vacuum space 401 caused by the suction of the first vacuum space 201. On the other hand, the surface of the flexible bag 3 is made of a material with certain adsorption performance, the first skirt 2 abuts against the surface of the workpiece first when the device abuts against the surface of the workpiece, forming an internal stable space, so that the working environment of the second skirt 4 and the flexible bag 3 is no longer disturbed by the external environment, and then the flexible bag 3 abuts against the surface of the workpiece, and the dust and impurities on the surface to be adsorbed are adsorbed when the flexible bag 3 is retracted into the second vacuum space 401 during suction, so that the dust and impurities on the contact surface of the second skirt 4 are greatly reduced, further improving the gripping effect of the device on the workpiece. At the same time, the flexible bag 3 can also uniformly support the inside of the first skirt 2 to prevent the local deformation of the first skirt 2 from causing air leakage of the first vacuum space 201 and thus causing the workpiece to fall off. Since the internal volume of the first vacuum space 201 is larger than that of the second vacuum space 401, the gripping effect is stronger, but the surface cleanliness and flatness required are also higher, and at this time, the second vacuum space 401 with smaller space can achieve good gripping and anti-falling effect.

[0039] Further, the upper ring-shaped frame 5 and the lower ring-shaped frame 6 are arranged on the inner walls of the upper and lower sides of the air cavity 301, and the upper ring-shaped frame 5 and the lower ring-shaped frame 6 approach or move away from each other with the volume change of the flexible bag 3, one end of the first connecting rod 7 is hinged to the upper ring-shaped frame 5, one end of the second connecting rod 8 is hinged to the first connecting rod 7, and the other end is hinged to the lower ring-shaped frame 6.

[0040] In the embodiment, the upper ring-shaped frame 5 and the lower ring-shaped frame 6 are arranged in the air cavity 301, and the upper ring-shaped frame 5 and the lower ring-shaped frame 6 approach each other when the volume of the flexible bag 3 changes, and the hinge points of the first connecting rod 7 and the second connecting rod 8 expand outward to support the inside of the second skirt 4, which can further prevent the second skirt 4 from deforming locally and thus causing the workpiece to fall off.

[0041] Further, the first elastic member 9 is arranged at one end on the upper ring-shaped frame 5 and at the other end on the lower ring-shaped frame 6, thereby providing a force for moving the upper ring-shaped frame 5 and the lower ring-shaped frame 6 away from each other.

[0042] In the embodiment, the first elastic member 9 and the second elastic member 12 are arranged, so that the normal reset state of the device is the state in which the upper ring-shaped frame 5 and the lower ring-shaped frame 6 are moved away from each other, thereby preventing abnormal angle change between the first connecting rod 7 and the second connecting rod 8 caused by gravity or accidental touch, and preventing the stability of the device in grabbing the workpiece from being deteriorated due to the phenomenon. At the same time, the support effect of the hinge joint of the first connecting rod 7 and the second connecting rod 8 on the second skirt 4 is more stable.

[0043] Further, the arc-shaped support block 10 is arranged on the hinge shaft of the first connecting rod 7 and the second connecting rod 8, and the arc-shaped support block 10 abuts against the inner wall of the air cavity 301 after the body of the flexible bag member 3 is reduced.

[0044] In the embodiment, the arc-shaped support block 10 is arranged on the hinge shaft of the first connecting rod 7 and the second connecting rod 8, and the arrangement of the arc-shaped support block 10 can increase the support effect of the hinge joint of the first connecting rod 7 and the second connecting rod 8 on the inside of the second skirt 4, and the part of the inner wall of the flexible bag member 3 directly contacting the arc-shaped support block 10 can also prevent damage caused by local extrusion of a small area.

[0045] Further, the first connecting rod 7, the second connecting rod 8 and the arc-shaped support block 10 jointly constitute a support assembly 1000, and the support assembly 1000 is arranged in a plurality of circumferential arrangements.

[0046] In the embodiment, the support assembly 1000 composed of the first connecting rod 7, the second connecting rod 8 and the third connecting rod is arranged in a plurality of circumferential arrangements, and the plurality of arc-shaped support blocks 10 arranged in the circumferential direction can form a ring-shaped support structure after being unfolded. The support structure abuts against the inside of the second skirt 4 after supporting the flexible bag member 3, can support the inside of the second skirt 4 in a plurality of circumferential directions, and further prevents the deformation and air leakage of the second skirt 4.

[0047] Further, the suction channel 101 has a suction port 102, and further comprises a sealing member 11 which is slidingly arranged in the suction channel 101, and the sealing member 11 blocks or opens the suction port 102 after sliding.

[0048] In the embodiment, the sealing member 11 is arranged in the suction channel 101, so that the gas in the flexible bag member 3 can be extracted. After the first skirt 2 and the second skirt 4 produce good adsorption on the workpiece, the sealing member 11 is driven to seal the suction channel 101, thereby preventing air leakage.

[0049] Further, the sealing member 11 has an extension part 1101 and a sliding part 1102, the sliding part 1102 is slidingly arranged in the suction channel 101, the extension part 1101 is located outside the main body 1, and the sealing member 11 further comprises a second elastic member 12, one end of the second elastic member 12 is arranged on the extension part 1101, and the other end is arranged on the main body 1, and the second elastic member 12 provides a force for the sealing member 11 to move away from the main body 1.

[0050] In the embodiment, the suction port 102 is located on one side of the main body 1, and in the normal state, the suction port 102 is in communication with the air suction device, when the device successfully grasps the workpiece, the extension part 1101 is driven to slide the sealing member 11 into the suction channel 101, so that the suction port 102 is disconnected with the suction channel 101, and finally the device can stably grasp the workpiece without maintaining suction.

[0051] Further, the first skirt 2 and the second skirt 4 are both circular truncated cone type.

[0052] In the embodiment, the circular truncated cone type of the first skirt 2 and the second skirt 4 can make the deformation amount of each part equal, and can maximize the stability of the suction and grasping state.

[0053] Further, the flexible bag member 3 is a flat sphere.

[0054] In the embodiment, the flat sphere-shaped flexible bag member 3 can more fully adsorb the dust on the surface of the workpiece, and after retraction, the dust is adsorbed on the surface or falls into the inside of the second vacuum space 401, and does not affect the adsorption effect of the contact position of the first skirt 2 and the second skirt 4.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced, without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. A vacuum chuck, characterized by A device for clamping and fixing a workpiece by suction on the surface of the workpiece, comprising: a main body (1) having a suction passage (101), a first skirt (2) provided on the main body (1) and used for abutting against the surface of the workpiece, the first skirt (2) internally forming a first vacuum space (201), a flexible bag member (3) located in the first vacuum space (201), the flexible bag member (3) internally having an air cavity (301) in communication with the suction passage (101), the volume of the flexible bag member (3) and the air cavity (301) being reduced after the air in the air cavity (301) is extracted.

2. A vacuum chuck as claimed in claim 1, characterized in that Further comprising: a second skirt (4) provided on the main body (1) and located in the first vacuum space (201), the bottom edge of the second skirt (4) being higher than that of the first skirt (2), the second skirt (4) internally forming a second vacuum space (401), the second skirt (4) abutting against the flexible bag member (3) after the volume of the flexible bag member (3) is increased, and the flexible bag member (3) being located in the first vacuum space (201) and the second skirt (4) abutting against the surface of the workpiece after the volume of the flexible bag member (3) is reduced.

3. A vacuum chuck as claimed in claim 1, characterized in that Further comprising: an upper annular frame (5) and a lower annular frame (6) respectively provided on the inner walls of the upper and lower sides of the air cavity (301), the upper annular frame (5) and the lower annular frame (6) moving closer to or away from each other with the change in the volume of the flexible bag member (3), a first connecting rod (7) having one end hinged to the upper annular frame (5), a second connecting rod (8) having one end hinged to the first connecting rod (7) and the other end hinged to the lower annular frame (6).

4. A vacuum chuck as claimed in claim 3, characterized in that Further comprising: a first elastic member (9) having one end provided on the upper annular frame (5) and the other end provided on the lower annular frame (6), providing a force for moving the upper annular frame (5) and the lower annular frame (6) away from each other.

5. A vacuum chuck as claimed in claim 3, characterized in that Further comprising: an arc-shaped support block (10) provided on the hinge shaft of the first connecting rod (7) and the second connecting rod (8), the arc-shaped support block (10) abutting against the inner wall of the air cavity (301) after the volume of the flexible bag member (3) is reduced.

6. A vacuum chuck as claimed in claim 5, characterized in that The first connecting rod (7), the second connecting rod (8) and the arc-shaped support block (10) together form a support assembly (1000), and the support assembly (1000) is arranged in a plurality of circumferential rows.

7. A vacuum chuck as claimed in claim 1, characterized in that The suction passage (101) has a suction port (102), and further comprising a sealing member (11) slidingly provided in the suction passage (101), the sealing member (11) blocking or opening the suction port (102) after sliding.

8. A vacuum chuck as claimed in claim 7, characterized in that The sealing member (11) has an extension part (1101) and a sliding part (1102), the sliding part (1102) is slidingly arranged in the suction passage (101), the extension part (1101) is located outside the main body (1), further comprising: a second elastic member (12), one end of the second elastic member (12) is arranged on the extension part (1101), the other end is arranged on the main body (1), and the second elastic member (12) provides a force for the sealing member (11) to move away from the main body (1).

9. A vacuum chuck as claimed in claim 2, characterized in that The first skirt (2) and the second skirt (4) are both circular truncated cone type.

10. A vacuum chuck as claimed in claim 1, characterized in that The flexible bag member (3) is a flat sphere.

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