Multi-sealing vacuum chuck

Abstract

The utility model discloses a multi-sealing vacuum chuck which comprises a chuck body, a working contact surface, an air exhaust hole and a mounting hole. The working contact bread comprises a supporting rib, a vent groove, a main sealing line and at least one auxiliary sealing line. The auxiliary sealing line is arranged on the outer side of the main sealing line; the bottom end of the main sealing line is higher than the bottom end of the auxiliary sealing line. The utility model provides a more reliable vacuum chuck with a multi-sealing structure, the main sealing line is suspended in the air during initial contact and less participates in sliding friction between the chuck and an external adsorption surface, the abrasion of the main sealing line is greatly reduced, the main sealing line can still ensure the reliability of the chuck under the condition that the auxiliary sealing line is slightly abraded, and the service life of the chuck is prolonged. And frequent maintenance and replacement are avoided, and high usability is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum suckers, in particular to a multi-sealed vacuum sucker. Background Art

[0002] There are two main types of common vacuum suction cups for robots, one with a single sealing line and the other with multiple sealing lines. For vacuum suction cups with a single sealing line, according to the working principle of the vacuum suction cup, after negative pressure is formed inside the suction cup bowl, the suction cup as a whole will be adsorbed to the working interface under the action of the internal and external pressure difference. During this process, the suction cup will deform toward one side of the negative pressure cavity, the corresponding suction cup material will spread out to the surroundings, and the sealing line will have a certain radial displacement; on the other hand, the suction cup is often accompanied by force during use. Therefore, during the long-term and multiple use of the vacuum suction cup, its sealing line will inevitably cause friction with the working interface and cause loss, resulting in a decrease in the sealing effect. The suction cup's adsorption capacity will decrease accordingly or require frequent air replenishment, thereby endangering the suction cup's use conditions.

[0003] For multiple parallel-arranged vacuum suction cups, the sliding displacement of the sealing line and the corresponding friction loss can be reduced. However, during use, the equal-height sealing ring will form a lever principle, causing the distant sealing line to tilt in the opposite direction of adsorption, and the sealing effect will be reduced. At the same time, this problem will be aggravated as the sealing line wears, further reducing reliability and endangering the normal use of the suction cup, thus requiring frequent replacement and maintenance, and its practicality is reduced.

[0004] Therefore, how to reduce the friction loss of the sealing line and improve the reliability and durability of the vacuum suction cup by designing the shape of the sealing line is an urgent problem to be solved. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a vacuum suction cup with a multiple sealing structure, the multiple seals including a main sealing line and a secondary sealing line; the secondary sealing line is located at the periphery and first makes physical contact with the external adsorption surface, the main sealing line is higher than the secondary sealing line in the height direction and thus has no physical contact with the external adsorption surface in a natural state; when the suction cup is working and reaches a certain vacuum degree, the suction cup expands and deforms as a whole and then makes the main sealing line contact with the external adsorption surface to form a secondary seal, which greatly reduces the wear of the main sealing line. When the secondary sealing line is slightly worn, the main sealing line can still ensure the reliability of the suction cup, thereby avoiding frequent maintenance and replacement and having high ease of use.

[0006] To achieve the above-mentioned purpose, the utility model provides a multi-sealed vacuum suction cup, comprising a suction cup body, a working contact surface, an air extraction hole and a mounting hole;

[0007] The suction cup body is used to form a negative pressure cavity with the external contact surface;

[0008] The working contact surface is located at the bottom surface of the suction cup body, and the working contact surface includes support ribs, ventilation grooves, a main seal line and at least one secondary seal line; both the main seal line and the secondary seal line are closed circles;

[0009] The secondary seal line is arranged outside the main seal line; the bottom end of the main seal line is higher than the bottom end of the secondary seal line; the support ribs are arranged inside the main seal line, and ventilation grooves are arranged between the support ribs;

[0010] The air extraction hole is arranged inside the suction cup body, and the air extraction hole is used to connect an air extraction air path; the mounting hole is used for mounting the vacuum suction cup.

[0011] Preferably, a plurality of secondary seal lines are provided, and the bottom ends of the secondary seal lines gradually rise from outside to inside, and the bottom end of the main seal line is higher than the bottom end of the innermost secondary seal line.

[0012] Preferably, the distance between each adjacent secondary seal line and the distance between the main seal line and the adjacent secondary seal line are equal.

[0013] Preferably, the support ribs include radial support ribs and circumferential support ribs, and the bottom surfaces of the circumferential support ribs are coplanar; the circumferential support ribs make the vacuum suction cup avoid excessive deformation by abutting the bottom surface against the external adsorption surface.

[0014] Preferably, ventilation grooves are arranged between the circumferential support ribs in both the circumferential and radial directions.

[0015] The beneficial effects of the present utility model are as follows:

[0016] The present utility model provides a vacuum suction cup with a more reliable multi - seal structure. The main seal line is suspended during initial contact and less participates in the sliding friction between the suction cup and the external adsorption surface, greatly reducing the wear of the main seal line. When the secondary seal line is slightly worn, the main seal line can still ensure the reliability of the suction cup, avoiding frequent maintenance and replacement, and having high usability; the setting of the support ribs can prevent the suction cup from excessive deformation and increase the total contact area, further reducing wear and improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 Structural schematic diagram of the vacuum suction cup for the embodiment of the utility model;

[0019] Figure 2 Structural schematic diagram of a partial section of the sealing line according to an embodiment of the present utility model;

[0020] Figures 3 to 5 Schematic diagram of the structural deformation process during the use of an embodiment of the present utility model. Specific implementation manners

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Figure 1 Shows the structure of the vacuum suction cup of the present utility model. The vacuum suction cup includes a suction cup main body 100, a working contact surface 200, an air extraction hole 300, and a mounting hole 400; the suction cup main body 100 has a vacuum working surface (i.e., the side wall) and has a certain volume. When the suction cup contacts the external adsorption surface and air is extracted, a negative pressure cavity is formed between the vacuum working surface and the external adsorption surface, generating an adsorption effect; the air extraction hole 300 is provided in the suction cup main body 100 for connecting the negative pressure cavity with the external air extraction air path; the mounting hole 400 is used to mount the suction cup on other structures. The working contact surface 200 is located at the bottom surface of the vacuum suction cup and includes a main sealing line 210, a secondary sealing line 220, a support rib 230, and a ventilation groove 240. The secondary sealing line 220 is located on the periphery, and the main sealing line 210 is located inside the secondary sealing line 220. Both the main sealing line 210 and the secondary sealing line 220 are closed circles, respectively used for forming the main seal and the primary seal of the negative pressure cavity. The support rib 230 is provided inside the main sealing line 210. The support rib 230 is arranged radially and circumferentially, and the circumferentially arranged part forms a plurality of discontinuous circular rings nested inside and outside, and the bottom surfaces are coplanar. Ventilation grooves 240 are provided between the support ribs 230. The ventilation grooves 240 are used to connect the internal spaces surrounded by the suction cup main body 100 and the main sealing line 210 to make the air pressure in the negative pressure cavity evenly distributed. The support rib 230 can control the deformation degree of the suction cup according to the expected height. When the suction cup main body 100 is deformed to a certain extent, the bottom surface of the circumferentially arranged part thereof abuts against the external adsorption surface, ensuring that the main sealing line 210 can fully contact the external adsorption surface without causing the suction cup main body 100 to be excessively deformed and damaging the vacuum of the negative pressure cavity; on the other hand, the support rib 230 increases the total contact area with the external adsorption surface. When the suction cup is subjected to a force parallel to the external adsorption surface direction, it can increase the friction force and avoid the friction force acting entirely on the sealing line, further reducing the wear of the sealing line.

[0023] Figure 2 The detailed structures of the main seal line 210 and the secondary seal line 220 of the present utility model are shown. For the sake of convenience of description, Figure 2 Taking the case where the external adsorption surface is located below as an example, the vacuum suction cup of the present utility model can also be used for external adsorption surfaces in other directions. When the suction cup is in the natural state of non-operation, the secondary seal line 220 is located outside the main seal line 210 and the position of the bottom end is lower (i.e., the lowest point of the working contact surface 200 of the entire suction cup); the main seal line 210 is the main sealing structure of the suction cup. In the natural state, the bottom end of the main seal line 210 is higher than the bottom end of the secondary seal line 220. For example, the main seal line 210 is 0.3 to 0.7 millimeters higher than the secondary seal line 220. During the working process, the height difference between the two depends on the negative pressure degree of the vacuum suction cup and the deformation amount of the suction cup main body material under this negative pressure value. When the suction cup deforms until the height difference disappears, the main seal line 210 contacts the external adsorption surface.

[0024] Furthermore, Figures 3 to 5 The deformation process of the vacuum suction cup during work is shown. The colored area shows the shape of the local cross-section of the vacuum suction cup during the deformation process, while the gray area shows the initial shape of the suction cup in the natural state. As Figure 3 shown, during work, the secondary seal line 220 makes initial physical contact with the external adsorption surface and establishes a primary seal, while at this time the main seal line 210 is suspended and has no physical contact with the external adsorption surface; as Figure 4 shown, as the negative pressure in the negative pressure cavity increases, the entire suction cup main body 100 expands outward and deforms downward, pushing the secondary seal line 220 to slide outward. Therefore, the secondary seal line 220 bears the main friction and wear during the work of the suction cup. Before reaching a certain threshold, the main seal line 210 remains suspended and thus no wear will be caused to it at this time; as Figure 5 shown, when the negative pressure in the negative pressure cavity reaches a predetermined threshold, the secondary seal line 220 slides to the final working position, and the main seal line 210 contacts the external adsorption surface and forms a main seal (i.e., a secondary seal). After the main seal is formed, if the negative pressure in the negative pressure cavity further increases, the bottom surfaces of some of the circumferentially arranged support ribs 230 will abut against the environmental contact surface, playing a role in preventing excessive deformation and increasing the contact surface.

[0025] In another preferred embodiment, more secondary seal lines 220 may also be provided on the working contact surface 200 of the vacuum suction cup, that is, N secondary seal lines 220 and one primary seal line 210 are provided in sequence from the outside to the inside (for example, N is 2). The bottoms of the N secondary seal lines 220 rise in sequence from the outside to the inside, and the bottom of the primary seal line 210 is higher than the innermost secondary seal line. Support ribs 230 are further provided inside the primary seal line, and the arrangement manner of the support ribs 230 is the same as that in the foregoing embodiment. Preferably, the seal lines are equidistantly arranged. When the suction cup works, the N secondary seal lines 220 form first, second... Nth seals with the external adsorption surface in sequence from the outside to the inside, and finally the primary seal line 210 forms the (N + 1)th seal, which is the main seal. During operation, the wear of the secondary seal lines from the outside to the inside decreases in sequence, and at the same time, the contact area can be further increased, further improving the reliability of the suction cup.

[0026] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A multi-sealed vacuum suction cup, characterized in that: It includes a suction cup body, a working contact surface, an air extraction hole and a mounting hole; The suction cup body is used to form a negative pressure cavity with the external contact surface; The working contact surface is located on the bottom surface of the vacuum suction cup, and the working contact surface includes support ribs, ventilation grooves, a main sealing line and at least one secondary sealing line; the main sealing line and the secondary sealing line are both closed circles; The secondary sealing line is arranged on the outside of the primary sealing line; the bottom end of the primary sealing line is higher than the bottom end of the secondary sealing line; the supporting ribs are arranged on the inside of the primary sealing line, and ventilation grooves are arranged between the supporting ribs; The air extraction hole is arranged in the suction cup body, and the air extraction hole is used to connect the air extraction air path; the installation hole is used for installing the vacuum suction cup.

2. The vacuum suction cup according to claim 1, characterized in that: There are multiple secondary sealing lines, and the bottom ends of the secondary sealing lines rise successively from the outside to the inside, and the bottom end of the main sealing line is higher than the bottom end of the innermost secondary sealing line.

3. The vacuum suction cup according to claim 2, characterized in that: The intervals between adjacent secondary sealing lines and between the main sealing line and the secondary sealing line adjacent thereto are equal.

4. The vacuum suction cup according to claim 1, characterized in that: The support ribs include radial support ribs and circumferential support ribs, and the bottom surfaces of the circumferential support ribs are coplanar; the circumferential support ribs prevent the vacuum suction cup from excessive deformation by abutting the bottom surface against the external adsorption surface.

5. The vacuum suction cup according to claim 4, characterized in that: Ventilation grooves are arranged between the circumferential support ribs in both the circumferential and radial directions.

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