Vacuum logic valve and suction cup

Abstract

The invention relates to the technical field of vacuum adsorption, in particular to a vacuum logic valve and a sucker, the vacuum logic valve comprises a valve body and a valve plate, a valve cavity is formed in the valve body, a first through hole and a second through hole which are oppositely arranged are formed in the valve body, and the first through hole and the second through hole communicate with the valve cavity; the valve plate is arranged in the valve cavity, a throttling hole and a circulation hole are formed in the valve plate, the hole diameter of the throttling hole is smaller than that of the circulation hole, the throttling hole is always communicated with the first through hole and the second through hole, and the valve plate makes part of the valve plate far away from / close to the first through hole by generating elastic deformation, so that the circulation hole is communicated with / disconnected from the first through hole. When an individual suction cup does not adsorb a workpiece, the valve plate can generate elastic deformation under the action of airflow to enable part of the valve plate to approach and block the first through hole, so that the circulation hole is disconnected from the first through hole, the airflow can only flow through the throttling hole, and therefore vacuum leakage at the position of the suction cup which does not adsorb the workpiece is reduced. And other suction cups can be ensured to normally suck and carry workpieces.

Description

Technical Field

[0001] The present application relates to the field of vacuum adsorption technology, and in particular to a vacuum logic valve and a suction cup. Background Art

[0002] When vacuum suction cups are used densely in an array, it is easy for individual suction cups to fail to absorb the workpiece, causing vacuum leakage, resulting in reduced vacuum in the suction cups that have absorbed the workpiece, making it impossible to complete normal handling work.

[0003] At present, vacuum logic valves are mainly installed on suction cups to avoid or reduce vacuum leakage. For example, a steel ball is used as the main body of the logic valve, and the steel column is limited by a spring and other structures. This requires the reservation of space for the steel ball to move and space for the spring to reset, which will increase the axial size of the suction cup and increase the overall thickness. In addition, when the suction cup breaks the vacuum, the steel ball will block the through hole connected to the suction cup under the action of gravity and air pressure, thereby affecting the speed of breaking the vacuum. Summary of the invention

[0004] The present application provides a vacuum logic valve and a suction cup, which are used to solve the problem in the prior art that the vacuum logic valve will cause the suction cup to have a larger axial dimension.

[0005] In one aspect, the present application provides a vacuum logic valve, comprising:

[0006] A valve body, wherein a valve cavity is formed inside the valve body, and a first through hole and a second through hole are provided on the valve body, which are oppositely arranged, and the first through hole and the second through hole are respectively connected to the valve cavity;

[0007] The valve plate is arranged in the valve cavity, and a throttling hole and a flow hole are opened on the valve plate. The aperture of the throttling hole is smaller than the aperture of the flow hole. The throttling hole is always connected with the first through hole and the second through hole. The valve plate generates elastic deformation to make part of the valve plate move away from / close to the first through hole, so that the flow hole is connected / disconnected with the first through hole.

[0008] In a possible design, the valve plate has a blocking portion, the diameter of the blocking portion is larger than the diameter of the first through hole, and the valve plate can make the blocking portion move away from / close to the first through hole by generating elastic deformation;

[0009] In a possible design, the throttling hole is formed on the blocking portion, and the flow hole is formed at a position of the valve plate other than the blocking portion.

[0010] In a possible design, the blocking portion is protrudingly disposed on a side of the valve plate close to the first through hole.

[0011] In a possible design, the valve plate is a soft body.

[0012] In a possible design, the diameter of the blocking portion is smaller than the diameter of the second through hole.

[0013] In a possible design, the throttling hole is opened at the center of the blocking portion, and the flow holes are evenly distributed in a ring shape around the center axis of the throttling hole.

[0014] In a possible design, the blocking portion is located at the center of the valve plate, and the edge of the valve plate is mounted on the inner wall of the valve cavity.

[0015] In a possible design, a limiting groove is provided on the inner wall of the valve cavity, and the edge of the valve plate is arranged in the limiting groove.

[0016] In a possible design, a convex ring is provided on the edge of the valve plate, and a ring groove matching the convex ring is provided on the inner wall of the limiting groove.

[0017] On the other hand, the present application also provides a suction cup, comprising the vacuum logic valve as described above.

[0018] The beneficial effects of this application are as follows:

[0019] The vacuum logic valve of the present application is provided with a valve plate in the valve cavity of the valve body, and a throttling hole and a flow hole are formed on the valve plate, wherein the throttling hole is always connected with the first through hole and the second through hole, and the valve plate is elastically deformed to control whether the flow hole is connected with the first through hole; when individual suction cups do not adsorb the workpiece, the valve plate can be elastically deformed under the action of airflow and air pressure to make part of the valve plate approach and block the first through hole, so that the flow hole is disconnected from the first through hole, and the airflow can only flow through the throttling hole at this time, thereby reducing vacuum leakage when individual suction cups do not adsorb the workpiece, thereby ensuring that other suction cups are in a state of being ... It can adsorb and transport workpieces normally; when adsorbing the workpiece normally, the valve plate first approaches and blocks the first through hole, and the air flow only flows through the throttling hole. After the air pressure on both sides of the valve plate is balanced, the valve plate will automatically move away from the first through hole to reset, and the air flow passes through the throttling hole and the flow hole, thereby further increasing the balancing speed of the air pressure on both sides, so that the workpiece can be stably adsorbed on the suction cup; when the workpiece is back-blown to break the vacuum, the valve plate elastically deforms in the opposite direction to move part of the valve plate away from the first through hole, thereby releasing the valve plate from blocking the first through hole, so that the first through hole and the flow hole remain connected, thereby maintaining a higher vacuum breaking speed.

[0020] The suction cup provided in the present application includes the vacuum logic valve in the present application, and therefore also includes all the above-mentioned advantages of the vacuum logic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 A schematic diagram of the structure of a vacuum logic valve provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of the valve plate of the vacuum logic valve provided in an embodiment of the present application.

[0024] Reference numerals:

[0025] 100, valve body; 110, valve seat; 120, valve cover; 130, valve cavity; 140, first through hole; 150, second through hole; 160, limit groove; 200, valve plate; 210, throttling hole; 220, flow hole; 230, blocking part; 240, circular ring; 250, connecting rib. DETAILED DESCRIPTION

[0026] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0027] Combine the following Figure 1-Figure 2 , describing the vacuum logic valve provided in an embodiment of the present application.

[0028] Reference Figure 1 , Figure 2As shown, the vacuum logic valve provided in the embodiment of the present application includes a vacuum logic valve, including a valve body 100 and a valve plate 200, a valve cavity 130 is formed inside the valve body 100, and a first through hole 140 and a second through hole 150 which are arranged opposite to each other are opened on the valve body 100. Specifically, the first through hole 140 is opened at the upper part of the valve body 100, and the first through hole 140 is connected to the negative pressure source, for example, connected to the vacuum generator, and the second through hole 150 is opened at the lower part of the valve body 100, and the second through hole 150 is connected to the suction cup, and the first through hole 140 and the second through hole 150 are connected to each other. The first through hole 140 and the second through hole 150 are coaxially arranged, so that the first through hole 140 and the second through hole 150 are respectively connected to the valve cavity 130, and the negative pressure source provides negative pressure for the suction cup through the first through hole 140, the valve cavity 130 and the second through hole 150; the valve plate 200 is arranged in the valve cavity 130, located between the first through hole 140 and the second through hole 150, and the valve plate 200 is a sheet structure with a certain elasticity. The edge of the valve plate 200 is clamped or adhered to the inner wall of the valve cavity 130. When there is no airflow passing through the valve cavity 130, the two sides of the valve plate 200 are respectively connected to the first through hole 140 and the second through hole 150. 0, the second through hole 150 is spaced a certain distance apart, therefore, designing the valve plate 200 as a sheet structure is conducive to reducing the thickness of the valve cavity 130; the material of the valve plate 200 is a soft body, such as silicone, which can produce a certain elastic deformation, so that the valve plate 200 can produce a moderate elastic deformation along the direction of the airflow under the impact of the airflow, so that part of the valve plate 200 is close to or away from the first through hole 140, so as to block the first through hole 140 or be spaced a certain distance apart from the first through hole 140; the valve plate 200 is provided with a throttling hole 210 and a flow Hole 220, the throttling hole 210 is opened on the valve plate 200 at a position below the first through hole 140, and the flow holes 220 are distributed around the throttling hole 210. The aperture of the throttling hole 210 is smaller than the aperture of the flow holes 220. When the valve plate 200 blocks the first through hole 140, the first through hole 140 and the second through hole 150 are connected only through the throttling hole 210; when the valve plate 200 is spaced a certain distance from the first through hole 140, the first through hole 140 and the second through hole 150 are connected through the throttling hole 210 and the flow holes 220.

[0029] By utilizing the technical solution of the above embodiment, the valve plate 200 is elastically deformed to control whether the flow hole 220 is connected to the first through hole 140. Specifically, when an individual suction cup does not adsorb the workpiece, the valve plate 200 can be elastically deformed under the action of airflow and air pressure to make part of the valve plate 200 approach and block the first through hole 140, so that the flow hole 220 is disconnected from the first through hole 140. At this time, the airflow can only flow through the throttle hole 210, thereby reducing vacuum leakage when an individual suction cup does not adsorb the workpiece, thereby ensuring that other suction cups can adsorb and transport the workpiece normally. When adsorbing the workpiece normally, the valve plate 200 first approaches and blocks the first through hole 140. The airflow only flows through the throttling hole 210 through the first through hole 140. After the air pressure on both sides of the valve plate 200 is balanced, the valve plate 200 will automatically move away from the first through hole 140 to reset, and the airflow passes through the throttling hole 210 and the flow hole 220, thereby further increasing the balancing speed of the air pressure on both sides, so that the workpiece can be stably adsorbed on the suction cup; when the workpiece is back-blown to break the vacuum, the valve plate 200 elastically deforms in the opposite direction so that part of the valve plate 200 is away from the first through hole 140, thereby releasing the valve plate 200 from blocking the first through hole 140, so that the first through hole 140 is connected with the flow hole 220 and the throttling hole 210, thereby maintaining a high vacuum breaking speed.

[0030] Reference Figure 1 , Figure 2As shown, in some embodiments of the present application, the valve plate 200 has a blocking portion 230. Specifically, the valve plate 200 is a circular plate, and the blocking portion 230 is a circular area in the center of the valve plate 200. The diameter of the blocking portion 230 is greater than the diameter of the first through hole 140. In this way, the valve plate 200 can block the first through hole 140 by generating elastic deformation. The throttle hole 210 is opened at the center of the blocking portion 230, and the throttle hole 210 passes through the blocking portion 230 along the thickness direction of the valve plate 200; the flow holes 220 are opened at the position of the valve plate 200 except the blocking portion 230, and the flow holes 220 are evenly distributed in a ring shape around the central axis of the throttle hole 210; specifically, the flow holes 220 is provided in the annular area between the outer edge of the sealing portion 230 and the outer edge of the valve plate 200; in some specific embodiments, the outer edge of the valve plate 200 is a circular ring 240, and the outer edge of the sealing portion 230 and the circular ring 240 are connected by connecting ribs 250 arranged along the radial direction of the valve plate 200, and a flow hole 220 is formed between two adjacent connecting ribs 250, so as to help expand the total flow area of ​​all the flow holes 220 on the valve plate 200, so as to help speed up the balancing speed of the air pressure on both sides of the valve plate 200, help the suction cup to form a stable vacuum state to complete the suction cup adsorbing the workpiece, and also help to increase the vacuum breaking speed to complete the workpiece removal from the suction cup. At the same time, the outer edge of the sealing portion 230 and the circular ring 240 are connected only by the connecting ribs 250, which is conducive to improving the deformation capacity of the valve plate 200 along the thickness direction, so as to ensure that the displacement of the sealing portion 230 can meet the requirements under the impact of airflow. Specifically, the number of connecting ribs 250 is at least two, for example Figure 2 In the embodiment, there are four connecting ribs 250 , and the four connecting ribs 250 separate four flow holes 220 , which improves the connection stability between the blocking portion 230 and the ring 240 while ensuring that the displacement of the blocking portion 230 can meet the requirements.

[0031] Reference Figure 1As shown, in some embodiments of the present application, the blocking portion 230 is protrudingly disposed on a side of the valve disc 200 close to the first through hole 140. Specifically, the blocking portion 230 and the valve disc 200 are an integrally formed structure. By making the blocking portion 230 protrude from the surface of the valve disc 200, the distance between the blocking portion 230 and the first through hole 140 can be reduced. On the one hand, it can ensure that the blocking portion 230 can contact and block the first through hole 140 under the action of the airflow. On the other hand, it will not affect the thickness of other positions of the valve disc 200, thereby not affecting the elastic deformation capacity of the valve disc 200. In some specific embodiments, the side of the blocking portion 230 close to the first through hole 140 is a spherical surface. In this way, the valve disc 200 and the first through hole 140 can be kept separated when no airflow flows through the valve cavity 130, and the blocking portion 230 can contact and block the first through hole 140 under the impact of the airflow, which is conducive to further reducing the height of the valve cavity 130.

[0032] Reference Figure 1 As shown, in some embodiments of the present application, the diameter of the blocking portion 230 is smaller than the diameter of the second through hole 150. In this way, the height of the valve cavity 130 is further reduced, and even if the blocking portion 230 moves downward to the position of the second through hole 150, the second through hole 150 cannot be blocked, thereby maintaining the normal connection between the second through hole 150 and the throttling hole 210 and the flow hole 220.

[0033] Reference Figure 1 As shown, in some embodiments of the present application, the valve body 100 includes a valve seat 110 and a valve cover 120 connected to each other, and a sealing groove is provided on the contact surface where the valve cover 120 and the valve seat 110 are buckled, and a sealing ring is provided in the sealing groove to ensure the sealing of the valve cavity 130. In some specific embodiments, an annular limiting groove 160 is formed between the valve seat 110 and the valve cover 120, and the thickness of the limiting groove 160 is consistent with the thickness of the edge of the valve plate 200, so that the edge of the valve plate 200 is clamped in the limiting groove 160. In some specific embodiments, a convex ring is provided on the edge of the valve plate 200, and a ring groove matching the convex ring is provided on the inner wall of the limiting groove 160, so as to play a role in radial limiting the valve plate 200 and prevent the edge of the valve plate 200 from escaping from the limiting groove 160.

[0034] Working principle of vacuum logic valve in this application:

[0035] The vacuum logic valve is divided into four states when working: natural state, non-adsorbed workpiece state, adsorbed workpiece state and backwash state.

[0036] Natural state: the valve plate 200 is in the middle of the valve cavity 130 and is not in contact with the first through hole 140 and the second through hole 150 . At this time, the pressure difference on both sides of the valve plate 200 is zero.

[0037] The state of no workpiece adsorption: a large amount of gas flows in from the second through hole 150, and flows to the first through hole 140 through the throttling hole 210 and the flow hole 220 of the valve plate 200. At this time, due to the pressure difference on both sides of the valve plate 200, there is a pressure on the valve plate 200 pointing to the first through hole 140; since the material of the valve plate 200 is silicone, it has a large elastic deformation ability, and under the above pressure, the valve plate 200 fits the first through hole 140; since the diameter of the blocking portion 230 is larger than the diameter of the first through hole 140, the blocking portion 230 blocks the first through hole 140 (the valve plate 200 is in the closed state), at this time, no gas flows through the flow hole 220, and the gas can only flow through the throttling hole 210. Since the flow area of ​​the throttling hole 210 is small, the gas flow rate is small, which is much smaller than the negative pressure suction flow at the first through hole 140, so it can ensure that the suction cups for other adsorbing workpieces can form a higher vacuum, and ensure that the suction cups for other adsorbing workpieces can successfully complete the action of adsorbing workpieces.

[0038] Workpiece adsorption state: gas flows in from the second through hole 150, passes through the throttling hole 210 and the flow hole 220 of the valve plate 200 and flows to the first through hole 140. At this time, due to the pressure difference on both sides of the valve plate 200, the valve plate 200 is attached to the first through hole 140, and the blocking part 230 blocks the first through hole 140, and the valve plate 200 will be briefly closed. When the valve plate 200 is in the closed state, since the suction cup adsorbs the workpiece, the cavity formed by the suction cup and the workpiece surface is small, and the gas flows to the first through hole 140 through the valve plate 200, and the flow rate gradually decreases to zero. The pressure difference on both sides of the valve plate 200 is zero. Under the action of elastic deformation, the valve plate 200 returns to its natural state, and the gas on both sides can circulate through the flow hole 220 of the valve plate 200, further increasing the balance speed of the air pressure on both sides of the valve plate 200, so that the suction cup forms a stable vacuum state, completing the action of adsorbing the workpiece.

[0039] Backblowing state: gas flows in from the first through hole 140, passes through the valve plate 200, and flows to the second through hole 150. This action is used to quickly detach the workpiece from the suction cup. Since the diameter of the sealing portion 230 is smaller than the diameter of the second through hole 150, the sealing portion 230 cannot completely fit the second through hole 150. The gas can still pass quickly through the flow hole 220 of the valve plate 200 to complete the backblowing action.

[0040] Compared with logic valves of other structural forms, the vacuum logic valve of the present application can be built into the threaded hole of the suction cup, effectively reducing the axial size of the suction cup and facilitating the adsorption action in a small space.

[0041] An embodiment of the present application also provides a suction cup, comprising the vacuum logic valve in the above embodiment.

[0042] It should be noted that the suction cup includes a vacuum logic valve, which also includes all the advantages of the vacuum logic valve mentioned above, which will not be repeated here.

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0047] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A vacuum logic valve, characterized in that: include: A valve body, wherein a valve cavity is formed inside the valve body, and a first through hole and a second through hole are formed on the valve body, and the first through hole and the second through hole are respectively connected to the valve cavity; A valve plate is arranged in the valve cavity, and a throttling hole and a flow hole are formed on the valve plate. The aperture of the throttling hole is smaller than the aperture of the flow hole, and the throttling hole is always connected with the first through hole and the second through hole. The valve plate generates elastic deformation to make part of the valve plate move away from / close to the first through hole, so that the flow hole is connected / disconnected with the first through hole.

2. The vacuum logic valve according to claim 1, characterized in that: The valve plate has a blocking portion, the diameter of the blocking portion is larger than the diameter of the first through hole, and the valve plate can make the blocking portion move away from or close to the first through hole by generating elastic deformation; The throttling hole is opened on the blocking portion, and the flow hole is opened at a position of the valve plate except the blocking portion.

3. The vacuum logic valve according to claim 2, characterized in that: The blocking portion is protrudingly arranged on a side of the valve plate close to the first through hole.

4. The vacuum logic valve according to claim 2, characterized in that: The valve sheet is a soft body.

5. The vacuum logic valve according to any one of claims 2 to 4, characterized in that: The diameter of the blocking portion is smaller than the diameter of the second through hole.

6. The vacuum logic valve according to any one of claims 2 to 4, characterized in that: The throttling hole is opened at the center of the blocking portion, and the flow holes are evenly distributed in a ring shape around the center axis of the throttling hole.

7. The vacuum logic valve according to any one of claims 2 to 4, characterized in that: The blocking portion is located at the center of the valve plate, and the edge of the valve plate is installed on the inner wall of the valve cavity.

8. The vacuum logic valve according to claim 7, characterized in that: The inner wall of the valve cavity is provided with a limiting groove, and the edge of the valve plate is arranged in the limiting groove.

9. The vacuum logic valve according to claim 8, characterized in that: A convex ring is arranged on the edge of the valve plate, and a ring groove matching the convex ring is opened on the inner wall of the limiting groove.

10. A suction cup, characterized in that: A vacuum logic valve comprising the vacuum logic valve according to any one of claims 1 to 9.

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