Vacuum chuck

Abstract

The utility model discloses a vacuum suction cup, belongs to the technical field of suction cup structures, and provides a vacuum suction cup better in following stability and lower in noise, the vacuum suction cup comprises an adsorption plate, a configuration plate and a vacuum cover, the configuration plate is fixedly connected between the adsorption plate and the vacuum cover, and the adsorption plate is provided with a plurality of suction ports penetrating through the upper end face and the lower end face; air inlet holes are formed in the end face, opposite to the adsorption plate, of the configuration plate, the number and the positions of the air inlet holes correspond to those of the suction ports, an air inlet channel is formed in each air inlet hole of the configuration plate, clamping grooves are further formed between the air inlet channels and the air inlet holes, and a negative pressure cavity is formed in the vacuum cover. The soft and elastic friction pad structure is arranged on the end face of the adsorption plate, the friction pad separates the suction ports, before air in the suction ports is extracted, an adsorbed object can completely cover the suction ports by squeezing the soft and elastic friction pad, only air in the suction ports is extracted during air extraction, air outside the suction ports cannot be sucked in, and therefore the air extraction efficiency is improved. And the air suction amount in the adsorption process is reduced.

Description

Technical Field

[0001] This application relates to the technical field of suction cup structures, and particularly to a vacuum suction cup. Background Art

[0002] A vacuum suction cup is a material picking and placing mechanism with relatively low usage cost. Since it uses the air pressure difference to press an object against the adsorption plate, the following stability of the adsorbed object is significantly inferior to that of a pure mechanical grasping structure. Moreover, during the working process, especially at the moment of adsorption, obvious noise will be generated due to the high-speed flow of air. Summary of the Invention

[0003] The purpose of this application is to provide a vacuum suction cup with better following stability and lower noise.

[0004] To achieve the above purpose, this application provides a vacuum suction cup: including an adsorption plate, a configuration plate, and a vacuum cover. The configuration plate is fixedly connected between the adsorption plate and the vacuum cover. The adsorption plate is provided with a number of suction ports penetrating the upper and lower end faces. The end face of the configuration plate facing the adsorption plate is provided with air inlet holes suitable for placing steel balls. The number and positions of the air inlet holes correspond to those of the suction ports. The configuration plate is provided with air inlet channels in each of the air inlet holes suitable for placing springs. A clamping groove is also provided between the air inlet channels and the air inlet holes suitable for embedding a sealing ring. The vacuum cover has a negative pressure chamber suitable for connecting to a vacuum generator through a pipe connection end. The end face of the configuration plate facing the vacuum cover is provided with air outlet holes suitable for connecting the air inlet channels and the negative pressure chamber to form a continuous negative pressure environment.

[0005] As a preference, the air outlet holes, the air inlet channels, the clamping grooves, and the air inlet holes are coaxial. The diameter of the air outlet holes is smaller than that of the air inlet channels. The diameter of the air inlet channels is smaller than that of the air inlet holes. The diameter of the air inlet holes is smaller than that of the clamping grooves, forming a stepped internal structure.

[0006] As a preference, the diameter of the spring is larger than that of the air outlet holes. The inner diameter of the sealing ring is smaller than or equal to the diameter of the air inlet channels. The diameter of the steel balls is larger than the inner diameter of the sealing ring, ensuring sufficient contact between the steel balls and the sealing ring.

[0007] As a preference, the end face of the adsorption plate facing the configuration plate is provided with relief grooves. The number and positions of the relief grooves correspond to those of the suction ports and are connected to the suction ports, capable of evacuating the air in the suction ports and generating negative pressure near the suction ports.

[0008] As a preference, a sealing strip is fixedly connected to the end face of the adsorption plate facing the configuration plate, and the sealing strip surrounds all the relief grooves. A sealing groove is formed in the end face of the configuration plate facing the adsorption plate, and the sealing groove surrounds all the air inlet holes. The sealing strip is adapted to fit with the sealing groove to prevent air leakage at the mating surface between the adsorption plate and the configuration plate.

[0009] As a preference, a counterbore is formed in the end face of the adsorption plate facing away from the configuration plate, and a friction pad is fixedly connected to the adsorption plate in the counterbore. The friction pad is provided with through holes penetrating the upper and lower end faces, and the number and positions of the through holes correspond to the suction ports, and the friction pad exposes all the suction ports.

[0010] As a preference, the thickness of the friction pad is greater than the depth of the counterbore. A relief groove is formed in the end face of the configuration plate facing the negative pressure chamber, so as to reduce the consumption of materials and the self-weight on the premise of ensuring the structural strength, so as to achieve better light weight.

[0011] As a preference, a pressure gauge is further provided on the vacuum cover, which is adapted to monitor the air pressure in the negative pressure chamber to help the staff judge whether the vacuum suction cup is normal.

[0012] Compared with the prior art, the beneficial effects of the present application are as follows:

[0013] (1) By configuring a soft and elastic friction pad structure on the end face of the adsorption plate, and the friction pad separates each suction port. Before the air in the suction port is evacuated, the object to be adsorbed can completely cover the suction port by squeezing the soft and elastic friction pad. When pumping air, only the air inside the suction port is evacuated, and the air outside the suction port is hardly sucked in. Therefore, the air intake and noise during the adsorption process are effectively reduced.

[0014] (2) Since the soft and elastic friction pad has a high contact friction coefficient, when the object is tightly adsorbed, it is difficult to move or rotate relative to the suction cup. Therefore, the vacuum suction cup can make the adsorbed object have better following stability during the transportation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall structural three-dimensional sectional view of the vacuum suction cup.

[0016] Figure 2 For the Figure 1 local enlarged view of part A of the vacuum suction cup.

[0017] Figure 3 It is a three-dimensional sectional view of the logic valve structure on the configuration plate of the vacuum suction cup.

[0018] Figure 4 For theFigure 3 Partial enlarged view at position B.

[0019] Figure 5 Schematic perspective view of the configuration plate of the vacuum suction cup.

[0020] Figure 6 Schematic cross-sectional view of the configuration plate of the vacuum suction cup.

[0021] Figure 7 For the vacuum suction cup Figure 6 Partial enlarged view at position C.

[0022] Figure 8 Schematic perspective view of the adsorption plate of the vacuum suction cup.

[0023] Figure 9 Schematic cross-sectional view of the adsorption plate of the vacuum suction cup.

[0024] Figure 10 Schematic perspective view of the friction pad of the vacuum suction cup.

[0025] Figure 11 Schematic perspective view of the vacuum cover of the vacuum suction cup.

[0026] Figure 12 Schematic cross-sectional view of the vacuum cover of the vacuum suction cup.

[0027] In the figure: 1, friction pad; 101, through hole; 2, adsorption plate; 201, sealing strip; 202, relief groove; 203, suction port; 204, sink; 3, spring; 4, sealing ring; 5, steel ball; 6, configuration plate; 601, load reduction groove; 602, air outlet hole; 603, air inlet channel; 604, clamping groove; 605, air inlet hole; 606, sealing groove; 7, vacuum cover; 701, pipe connection end; 702, negative pressure chamber; 8, pressure gauge. Specific embodiments

[0028] Next, in combination with specific embodiments, the present application will be further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments.

[0029] In the description of the present application, it should be noted that for orientation terms, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation and positional relationship are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as limiting the specific protection scope of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence.

[0031] The terms "comprising" and "having" in the description and claims of the present application, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] As Figure 1-12 shown, the vacuum suction cup mainly includes three layers of structures: a suction plate 2, a configuration plate 6, and a vacuum cover 7. The configuration plate 6 is fixedly connected between the suction plate 2 and the vacuum cover 7 to form a sandwich structure. The vacuum cover 7 has a negative pressure chamber 702 inside, and can be connected to a vacuum generator through a pipe connection end 701 on its outer surface. A pressure gauge 8 is also provided on the vacuum cover 7, fixedly connected to the outer surface of the vacuum cover 7, for monitoring the air pressure in the negative pressure chamber 702 and facilitating observation by the staff.

[0033] The adsorption plate 2 is provided with suction ports 203 penetrating through the upper and lower end faces. The number of the suction ports 203 is several and they are evenly arranged. The end face of the configuration plate 6 facing the adsorption plate 2 is provided with air inlet holes 605, inside which steel balls 5 are placed as the valve cores of the vacuum logic valves. The number and positions of the air inlet holes 605 correspond to those of the suction ports 203. The diameter of the air inlet holes 605 is larger than that of the suction ports 203. The configuration plate 6 is provided with air inlet channels 603 in each air inlet hole 605, inside which springs 3 are placed. The springs 3 are used to provide elastic force for the steel balls 5. A clamping groove 604 is also formed between the air inlet channel 603 and the air inlet hole 605, inside which a sealing ring 4 can be embedded. The sealing ring 4 is used to closely fit with the surface of the steel ball 5 to form a sealing surface. The end face of the configuration plate 6 facing the vacuum cover 7 is provided with an air outlet hole 602 for connecting the air inlet channel 603 with the negative pressure chamber 702. Since the air inlet channel 603 is originally connected with the air inlet hole 605, the negative pressure chamber 702 can also be connected with the suction port 203 through the air inlet hole 605.

[0034] It should be noted that the air outlet hole 602, the air inlet channel 603, the clamping groove 604 and the air inlet hole 605 are coaxial, which is more convenient for processing. And the diameter of the air outlet hole 602 is smaller than that of the air inlet channel 603, the diameter of the air inlet channel 603 is smaller than that of the air inlet hole 605, and the diameter of the air inlet hole 605 is smaller than that of the clamping groove 604. While the diameter of the spring 3 is larger than that of the air outlet hole 602, so that the spring 3 will not pass through the air outlet hole 602 and the end of the spring 3 is restricted. The inner diameter of the sealing ring 4 is usually smaller than or equal to the diameter of the air inlet channel 603, and the thickness of the sealing ring 4 is equivalent to the height of the clamping groove 604 along the axis, so as to well ensure the stable position of the sealing ring 4. Finally, the diameter of the steel ball 5 is naturally smaller than that of the air inlet hole 605 but larger than the inner diameter of the sealing ring 4, so that the steel ball 5 can fully contact with the sealing ring 4 to form an annular sealing surface.

[0035] The end face of the adsorption plate 2 facing away from the configuration plate 6 is provided with a sunk groove 204. The sunk groove 204 is in a grid shape. The suction ports 203 are all located within the grid, and there is only one suction port 203 in each grid. A friction pad 1 is fixedly connected in the sunk groove 204 of the adsorption plate 2. The friction pad 1 is made of rubber or silica gel material, has a relatively high contact friction coefficient, and can improve the sealing performance of the contact surface through extrusion deformation. The friction pad 1 is provided with through holes 101 penetrating the upper and lower end faces. The number and positions of the through holes 101 correspond to those of the suction ports 203. Therefore, the friction pad 1 is also in a grid shape. In this way, each suction port 203 is separated by the soft and elastic friction pad 1, effectively improving the sealing performance of each suction port 203 when generating vacuum suction force. The thickness of the friction pad 1 is greater than the depth of the sunk groove 204 and directly contacts the object to be adsorbed. The end face of the configuration plate 6 facing the negative pressure chamber 702 is provided with a weight-reducing groove 601. Since the configuration plate 6 itself has a relatively large thickness and is also heavy, in order to achieve the light weight of the entire suction cup structure, reasonable material reduction is carried out on the configuration plate 6 to reduce its own weight while ensuring the structural stability. The end face of the adsorption plate 2 facing the configuration plate 6 is provided with a relief groove 202. The inner wall of the relief groove 202 is spherical and is used to accommodate the steel balls 5 pushed away by the spring 3 and separated from the sealing ring 4. The number and positions of the relief grooves 202 correspond to those of the suction ports 203 and are communicated with the suction ports 203. When the steel balls 5 are separated from the sealing ring 4, the annular sealing surface disappears, and air can pass through the gap between the steel balls 5 and the inner wall of the air inlet hole 605 to achieve air extraction and generate negative pressure.

[0036] A sealing strip 201 is fixedly connected to the end face of the adsorption plate 2 facing the configuration plate 6. Usually, the sealing strip 201 and the adsorption plate 2 are made into an integral structure. At least the sealing strip 201 protrudes significantly from the end face of the adsorption plate 2. The sealing strip 201 surrounds all the relief grooves 202 and simultaneously seals all the relief grooves 202. The end face of the configuration plate 6 facing the adsorption plate 2 is provided with a sealing groove 606. Similarly, the sealing groove 606 surrounds all the air inlet holes 605. The sealing strip 201 just fits with the sealing groove 606 with the same shape and size to form an annular sealing structure to prevent air leakage from the fitting gap between the adsorption plate 2 and the configuration plate 6.

[0037] Working principle: When in use, start the vacuum generator to evacuate the air in the negative pressure chamber 702 to form a vacuum environment. Then, bring the adsorption plate 2 close to the item to be lifted. Since the item has a certain shape and size, it will cover a part of the suction ports 203. Of course, there are also some suction ports 203 that will not be completely covered. When the suction port 203 is completely covered, the pressure difference between the corresponding air inlet channel 603 and the air inlet hole 605 will quickly disappear. The steel ball 5 will separate from the sealing ring 4 under the elastic force of the spring 3, and the negative pressure chamber 702 will communicate with the suction port 203. The air near the suction port 203 will also be evacuated to form a connected negative pressure environment. The external atmospheric pressure can tightly press the item near the blocked suction port 203. The suction ports 203 that are not completely covered are still in communication with the external atmosphere. The steel ball 5 is affected by the external air pressure and may overcome the elastic force of the spring 3 and its own gravity to closely contact the sealing ring 4 to maintain a sealed state, which can effectively reduce the air intake of the suction cup and reduce the noise during operation. The item being sucked is in close contact with the friction pad 1 and will not slide or rotate relative to the suction cup during transportation, having high stability and controllability.

[0038] The above describes the basic principle, main features and advantages of the present application. Those skilled in the art of this industry should understand that the present application is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present application. Without departing from the spirit and scope of the present application, the present application will have various changes and improvements, and these changes and improvements all fall within the scope of the present application claimed. The scope of protection required by the present application is defined by the appended claims and their equivalents.

Claims

1. A vacuum suction cup, characterized in that: The invention comprises an adsorption plate (2), a configuration plate (6) and a vacuum cover (7), wherein the configuration plate (6) is fixedly connected between the adsorption plate (2) and the vacuum cover (7), the adsorption plate (2) is provided with a plurality of suction ports (203) penetrating the upper and lower end surfaces, the configuration plate (6) is provided with air inlet holes (605) on the end surface facing the adsorption plate (2), suitable for placing steel balls (5), the number and position of the air inlet holes (605) correspond to the suction ports (203), and the configuration plate (6) has a plurality of suction ports (203) extending through the upper and lower end surfaces. An air inlet channel (603) is provided in the air inlet hole (605), suitable for placing a spring (3); a card slot (604) is provided between the air inlet channel (603) and the air inlet hole (605), suitable for embedding a sealing ring (4); a negative pressure chamber (702) is provided in the vacuum cover (7), suitable for connecting to a vacuum generator through a pipe connection end (701); an air outlet hole (602) is provided on the end surface of the configuration plate (6) facing the vacuum cover (7), suitable for connecting the air inlet channel (603) and the negative pressure chamber (702).

2. The vacuum suction cup according to claim 1, characterized in that: The air outlet hole (602), the air inlet channel (603), the slot (604) and the air inlet hole (605) are coaxial; the diameter of the air outlet hole (602) is smaller than that of the air inlet channel (603); the diameter of the air inlet channel (603) is smaller than that of the air inlet hole (605); and the diameter of the air inlet hole (605) is smaller than that of the slot (604).

3. The vacuum suction cup according to claim 2, characterized in that: The diameter of the spring (3) is greater than the diameter of the air outlet (602), the inner diameter of the sealing ring (4) is less than or equal to the diameter of the air inlet channel (603), and the diameter of the steel ball (5) is greater than the inner diameter of the sealing ring (4).

4. The vacuum suction cup according to claim 3, characterized in that: The end surface of the adsorption plate (2) facing the configuration plate (6) is provided with a clearance groove (202), the number and position of the clearance grooves (202) correspond to the suction port (203), and are connected to the suction port (203).

5. The vacuum suction cup according to claim 4, characterized in that: A sealing strip (201) is fixedly connected to the end surface of the adsorption plate (2) facing the configuration plate (6), and the sealing strip (201) surrounds all the clearance grooves (202) therein. A sealing groove (606) is provided on the end surface of the configuration plate (6) facing the adsorption plate (2), and the sealing groove (606) surrounds all the air inlet holes (605) therein. The sealing strip (201) is suitable for fitting with the sealing groove (606).

6. The vacuum chuck according to any one of claims 1 to 5, characterized in that: The end surface of the adsorption plate (2) facing away from the configuration plate (6) is provided with a sink groove (204), and the adsorption plate (2) is fixedly connected with a friction pad (1) in the sink groove (204). The friction pad (1) is provided with through holes (101) penetrating the upper and lower end surfaces, and the number and position of the through holes (101) correspond to the suction port (203).

7. The vacuum suction cup according to claim 6, characterized in that: The thickness of the friction pad (1) is greater than the depth of the sink groove (204), and the end surface of the configuration plate (6) facing the negative pressure chamber (702) is provided with a load-reducing groove (601).

8. The vacuum chuck according to any one of claims 1 to 5, characterized in that: The vacuum cover (7) is also provided with a pressure gauge (8) suitable for monitoring the air pressure in the negative pressure chamber (702).

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