Positive and negative pressure centralized control type vacuum generator

Abstract

The application discloses a positive and negative pressure integrated control type vacuum generator, which comprises a valve assembly module and a main body module, the valve assembly module comprises air control valve A and air control valve B, and the air control valve A and the air control valve B are both two-position three-way valves. The valve assembly module comprises a valve body, a valve cavity is arranged in the valve body, a valve rod A and a valve rod B are arranged in the valve cavity, and air ports A, B, C, D and E which are respectively communicated with the valve cavity are arranged on the valve body; the main body module is provided with a vacuum generating device. The two two-position three-way valves are integrated, so that the vacuum generator integrates negative pressure generation and positive pressure driving functions. On the same equipment, positive pressure gas can be used to generate negative pressure, workpieces are sucked by a suction cup, and the workpieces are released by breaking the vacuum after the operation of carrying is completed; and the positive pressure gas can be used to drive a single-acting air cylinder or a single-acting air claw to perform tasks such as pushing and clamping, so that the multifunctional integration greatly expands the application scene of the equipment, reduces the number of equipment and saves the cost.

Description

Technical Field

[0001] This invention relates to the field of vacuum generator technology, and in particular to a positive and negative pressure centralized control type vacuum generator. Background Technology

[0002] In the field of industrial automation, vacuum technology and pneumatic technology play a crucial role. A vacuum generator is a highly efficient, clean, and compact vacuum component that uses a positive pressure air source to generate negative pressure. This makes it very easy and convenient to obtain negative pressure in places where compressed air is available, or in a pneumatic system where both positive and negative pressure are required simultaneously. Vacuum generators are widely used in industrial automation in fields such as machinery, electronics, packaging, printing, plastics, and robotics. The traditional application of vacuum generators is in conjunction with suction cups for the adsorption and handling of various materials, especially suitable for adsorbing fragile, soft, non-metallic materials or spherical objects.

[0003] For example, a valve island type vacuum generator system disclosed in Chinese invention patent (publication number: CN119267344A) includes several vacuum generators. Each vacuum generator comprises a main module, a valve assembly module, and a pressure gauge module. The valve assembly module includes a vacuum valve, a venting valve, a vacuum pilot valve, and a venting pilot valve. Both the vacuum valve and the venting valve are two-position, two-way gas-controlled valves. When the vacuum valve operates, positive pressure gas enters the nozzle assembly through the gas path to generate negative pressure gas. This negative pressure gas drives the negative pressure suction port to draw in air, which is used to adsorb the workpiece. When the venting valve operates, the venting valve outlet is connected to the venting valve inlet. The positive pressure gas exiting through the venting valve outlet is divided into two paths. The first path reaches the negative pressure suction port and vents to release the workpiece; the second path enters the nozzle assembly and is discharged through the centralized exhaust port.

[0004] However, the valve island type vacuum generator system disclosed in the above-mentioned prior art uses two-position two-way pneumatic control valves for both the vacuum valve and the venting valve. The functional limitations of the two-position two-way pneumatic control valve mean that it can only achieve simple on / off control of the gas path, and can only meet the operational requirements of the vacuum generator to generate negative pressure and venting. It cannot achieve precise control and distribution of positive pressure gas, which makes the flow of positive pressure gas to the working port unstable. As a result, it cannot achieve the positive pressure drive function, such as driving the operation of single-acting cylinders, single-acting grippers, etc., and thus it is difficult to meet the requirements of multi-functional integration of equipment in industrial production, which limits the further improvement of production efficiency and the expansion of equipment application scenarios.

[0005] Therefore, it is necessary to improve the existing technology. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings and deficiencies of existing technologies by providing a positive and negative pressure integrated vacuum generator. This generator integrates two two-position three-way valves, combining negative pressure generation and positive pressure drive functions into one unit. On the same device, it can both utilize positive pressure gas to generate negative pressure, using a suction cup to pick up workpieces and release them after handling; and, when needed, use positive pressure gas to drive a single-acting cylinder or single-acting gripper to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the equipment, reduces the number of devices required, and saves production costs.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A positive and negative pressure centralized control vacuum generator includes a valve assembly module and a main body module. The valve assembly module includes a pneumatic control valve A and a pneumatic control valve B, both of which are two-position three-way valves. The valve assembly module includes a valve body, which contains a valve cavity. Valve stems A and B are disposed within the valve cavity. The valve body has air ports A, B, C, D, and E, which are respectively connected to the valve cavity. Valve stem A has a first position and a second position. When valve stem A is in the first position, air port A is connected to air port B. When valve stem A is in the second position, air port A is connected to air port B. Port B is connected to port C; the valve stem B has a third position and a fourth position. When the valve stem B is in the third position, port D is connected to port E. When the valve stem B is in the fourth position, port C is connected to port D; a vacuum generating device is provided in the main module. The air inlet of the vacuum generating device is connected to port D through a first air passage, and the negative pressure outlet of the vacuum generating device is connected to port A through a second air passage; the main module is provided with an air inlet and a working port. The air inlet is connected to port C through a third air passage, and the working port is connected to port B through a fourth air passage.

[0009] Furthermore, the valve assembly module also includes pilot valve A and pilot valve B. The valve stem A and valve stem B divide the valve chamber into a first chamber, a second chamber, and a third chamber. The first chamber is connected to pilot valve A, the second chamber is connected to a third air passage through air port C, and the third chamber is connected to pilot valve B.

[0010] Furthermore, the working port is equipped with a suction cup.

[0011] Furthermore, the working port is equipped with a single-acting cylinder or a single-acting pneumatic gripper.

[0012] Furthermore, the vacuum generating device includes a primary nozzle and a secondary nozzle connected in sequence. The main module is provided with a primary suction side hole corresponding to the primary nozzle and a secondary suction side hole corresponding to the secondary nozzle. A diaphragm is provided at the secondary suction side hole.

[0013] Furthermore, a one-way throttle valve is provided between the working port and the gas port B to regulate the flow rate of the positive pressure gas flowing from the gas port B to the working port.

[0014] Furthermore, the one-way throttle valve includes a one-way valve and a throttle valve, wherein the one-way valve and the throttle valve are arranged in parallel between the working port and the gas port B.

[0015] Furthermore, the main module is provided with a throttling valve chamber, the throttling valve chamber is provided with a first valve port communicating with the working port, and the throttling valve chamber is provided with an adjusting rod for adjusting the opening of the first valve port, the adjusting rod being threadedly connected to the main module.

[0016] Furthermore, the main module is provided with a one-way valve chamber that communicates with the throttle valve chamber. The one-way valve chamber is provided with a second valve port that communicates with the working port. The one-way valve chamber is also provided with a valve core and a spring that correspond to and cooperate with the second valve port. The spring makes the valve core always have a tendency to close the second valve port.

[0017] Furthermore, the main module includes a pressure gauge for detecting the pressure value flowing out from the one-way throttle valve.

[0018] With the above structure, the beneficial effects of this invention are as follows: The positive and negative pressure integrated vacuum generator of this invention includes a valve assembly module and a main body module. The valve assembly module includes pneumatic control valve A and pneumatic control valve B, both of which are two-position three-way valves. The integration of two two-position three-way valves allows the vacuum generator to integrate negative pressure generation and positive pressure driving functions. On the same device, it can both utilize positive pressure gas to generate negative pressure, use a suction cup to pick up workpieces, and release the workpieces after handling; and when needed, it can use positive pressure gas to drive a single-acting cylinder or a single-acting gripper to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the equipment, reduces the number of devices, and saves production costs. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention, the accompanying drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 This is an exploded view of the overall structure of the present invention;

[0022] Figure 3 This is a cross-sectional view of the overall structure of the present invention. Figure 1 ;

[0023] Figure 4 This is a cross-sectional view of the overall structure of the present invention. Figure 2 ;

[0024] Figure 5 This is the invention Figure 4 Enlarged schematic diagram of the structure at point A;

[0025] Figure 6 This is a cross-sectional view of the overall structure of the present invention. Figure 3 ;

[0026] Figure 7 This is a cross-sectional view of the valve assembly module of the present invention;

[0027] Figure 8 The pneumatic principle of this invention Figure 1 (The entire machine is in shutdown state);

[0028] Figure 9 The pneumatic principle of this invention Figure 2 (Vacuum generation state);

[0029] Figure 10 The pneumatic principle of this invention Figure 3 (Breaking through a vacuum)

[0030] Figure 11 The pneumatic principle of this invention Figure 4 (Breaking the vacuum while it is stopped);

[0031] Figure 12 The pneumatic principle of this invention Figure 5 (Drives a single-acting cylinder);

[0032] Figure 13 The pneumatic principle of this invention Figure 6 (Single-acting cylinder reset);

[0033] Figure 14 The pneumatic principle of this invention Figure 7 (Drive single-acting pneumatic gripper);

[0034] Figure 15 The pneumatic principle of this invention Figure 8 (Single-acting pneumatic gripper reset);

[0035] Figure 16 This is a schematic diagram showing the connection and coordination of several vacuum generators used in conjunction with each other according to the present invention.

[0036] Figures 1 to 16 The winning number is:

[0037] 1. Valve body; 11. Air port A; 12. Air port B; 13. Air port C; 14. Air port D; 15. Air port E; 2. Valve chamber; 21. Valve stem A; 22. Valve stem B; 23. First chamber; 24. Second chamber; 25. Third chamber; 3. Vacuum generating device; 31. Air inlet port; 32. Negative pressure outlet; 33. First-stage nozzle; 34. Second-stage nozzle; 35. Air outlet port; 351. Silencing device; 4. One-way throttle valve; 41. One-way valve; 411. One-way valve chamber; 412. Second valve port; 413. Valve core; 414. Spring; 42. Throttling valve ; 421, Throttling valve chamber; 422, First valve port; 423, Adjusting rod; 5, Suction cup; 6, Single-acting cylinder; 7, Single-acting gripper; 8, Pressure gauge; 9, Main air inlet pipe; 10, First air passage; 20, Second air passage; 30, Third air passage; 40, Fourth air passage; 100, Valve assembly module; 101, Pneumatic control valve A; 102, Pneumatic control valve B; 103, Pilot valve A; 104, Pilot valve B; 200, Main module; 201, Air inlet; 202, Working port; 203, First-stage suction side port; 204, Second-stage suction side port; 2041, Diaphragm. Detailed Implementation

[0038] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of this invention, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, the term "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] In this invention, unless otherwise explicitly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. Where applicable, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this invention are for illustrative purposes only and do not represent the only possible implementation.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] like Figures 1 to 16As shown, a positive and negative pressure centralized control vacuum generator includes a valve assembly module 100 and a main body module 200. The valve assembly module 100 includes a pneumatic control valve A101 and a pneumatic control valve B102, both of which are two-position three-way valves. The valve assembly module 100 includes a valve body 1, within which a valve chamber 2 is provided. A valve stem A21 and a valve stem B22 are provided within the valve chamber 2. The valve body 1 is provided with air ports A11, B12, C13, D14, and E15, which are respectively connected to the valve chamber 2. The valve stem A21 has a first position and a second position. When the valve stem A21 is in the first position, air port A11 is connected to air port B12. When the valve stem A21 is in the second position, air port B12 is connected to air port B12. B12 is connected to air port C13; the valve stem B22 has a third position and a fourth position. When the valve stem B22 is in the third position, air port D14 is connected to air port E15; when the valve stem B22 is in the fourth position, air port C13 is connected to air port D14; a vacuum generator 3 is provided inside the main module 200. The air inlet 31 of the vacuum generator 3 is connected to air port D14 through the first air passage 10, and the negative pressure outlet 32 ​​of the vacuum generator 3 is connected to air port A11 through the second air passage 20; the main module 200 is provided with an air inlet 201 and a working port 202. The air inlet 201 is connected to air port C13 through the third air passage 30, and the working port 202 is connected to air port B12 through the fourth air passage 40. A silencer 351 is connected to the air outlet 35 of the vacuum generator 3. The valve assembly module 100 further includes pilot valve A103 and pilot valve B104. Valve stem A21 and valve stem B22 divide the valve chamber 2 into a first chamber 23, a second chamber 24 and a third chamber 25. The first chamber 23 is connected to pilot valve A103. The second chamber 24 is connected to the third air passage 30 through air port C13. The third chamber 25 is connected to pilot valve B104.

[0046] Based on the above embodiments, the present invention aims to provide a positive and negative pressure centralized control vacuum generator, including a valve assembly module 100 and a main body module 200. The valve assembly module 100 includes a pneumatic control valve A101 and a pneumatic control valve B102, both of which are two-position three-way valves. The valve assembly module 100 includes a valve body 1, within which a valve cavity 2 is provided. A valve stem A21 and a valve stem B22 are provided within the valve cavity 2. The valve body 1 is provided with air ports A11, B12, C13, D14, and E15, which are respectively connected to the valve cavity 2. The valve stem A21 has a first position and a second position. When the valve stem A21 is in the first position, air port A11 is connected to air port B12. When the valve stem A21 is in the second position... When in the working position, air port B12 is connected to air port C13; valve stem B22 has a third working position and a fourth working position. When valve stem B22 is in the third working position, air port D14 is connected to air port E15; when valve stem B22 is in the fourth working position, air port C13 is connected to air port D14; a vacuum generator 3 is provided in the main module 200. The air inlet 31 of the vacuum generator 3 is connected to air port D14 through the first air passage 10, and the negative pressure outlet 32 ​​of the vacuum generator 3 is connected to air port A11 through the second air passage 20; the main module 200 is provided with an air inlet 201 and a working port 202. The air inlet 201 is connected to air port C13 through the third air passage 30, and the working port 202 is connected to air port B12 through the fourth air passage 40. It integrates two two-position three-way valves, so that the vacuum generator integrates negative pressure generation and positive pressure driving functions. On the same equipment, positive pressure gas can be used to generate negative pressure to pick up workpieces through suction cup 5 and release them after handling; when needed, positive pressure gas can be used to drive single-acting cylinder 6 or single-acting gripper 7 to perform tasks such as pushing and clamping. This multi-functional integration greatly expands the application scenarios of the equipment, reduces the number of equipment, and saves production costs.

[0047] In a further preferred embodiment, several vacuum generators can be used in combination, such as... Figure 16 As shown, multiple vacuum generators are supplied with air through the main air intake pipe 9. Several vacuum generators used in combination can be controlled separately. For example, some vacuum generators control the suction cup 5, some vacuum generators control the single-acting cylinder 6, and some vacuum generators control the single-acting gripper 7. Each vacuum generator can be started and stopped separately, achieving flexible control and improving the practicality of the product.

[0048] As another preferred embodiment of the present invention, the working port 202 is provided with a suction cup 5. In this embodiment, as... Figure 8As shown, when both pilot valve A103 and pilot valve B104 are de-energized, valve stem A21 is in the first position, air port A11 is connected to air port B12, and air port A11 is disconnected from air port C13, so gas does not enter the pneumatic control valve A101; valve stem B22 is in the third position, air port D14 is connected to air port E15, and air port D14 is disconnected from air port C13, so gas does not enter the pneumatic control valve B102, and the vacuum generator is in a stopped state.

[0049] In this embodiment, as Figure 9 As shown, when pilot valve B104 is energized and pilot valve A103 is de-energized, positive pressure gas flows through pilot valve B104 to the third chamber 25. Because the cross-sectional area of ​​the end of valve stem B22 located in the third chamber 25 is larger than the cross-sectional area of ​​the end of valve stem B22 located in the second chamber 24, valve stem B22 moves from the third position to the fourth position. Air port D14 is connected to air port C13, valve stem A21 is in the first position, and air ports A11 and B1... 2. Positive pressure gas enters the inlet port 31 of vacuum generator 3 through inlet 201, third air passage 30, air port C13, air port D14 and first air passage 10. Positive pressure gas flows through first-stage nozzle 33 and second-stage nozzle 34 to generate negative pressure. Negative pressure gas enters one-way throttle valve 4 through negative pressure outlet 32, second air passage 20, air port A11, air port B12 and fourth air passage 40. After the flow rate is adjusted by one-way throttle valve 4, it flows to working port 202 and is gripped by suction cup 5 set at working port 202.

[0050] In this embodiment, as Figure 10As shown, when both pilot valve B104 and pilot valve A103 are energized, positive pressure gas flows through pilot valve B104 to the third chamber 25. Because the cross-sectional area of ​​the end of valve stem B22 located in the third chamber 25 is larger than the cross-sectional area of ​​the end of valve stem B22 located in the second chamber 24, valve stem B22 moves from the third position to the fourth position, and the gas port D14 communicates with the gas port C13. Positive pressure gas also flows through pilot valve A103 to the first chamber 23. Because the cross-sectional area of ​​the end of valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of ​​the end of valve stem A21 located in the second chamber 24, valve stem A21 moves from the first position to the second position, and the gas port B12... The positive pressure gas is connected to the air inlet C13; the positive pressure gas enters the air inlet port 31 of the vacuum generator 3 through the air inlet 201, the third air passage 30, the air inlet C13, the air inlet D14 and the first air passage 10. The positive pressure gas flows through the first nozzle 33 and the second nozzle 34 to generate negative pressure. The negative pressure gas flows through the negative pressure outlet 32 ​​and the second air passage 20 to the air inlet A11. At this time, the air inlet A11 is disconnected from the air inlet B12, and the negative pressure gas can no longer flow. The positive pressure gas enters the one-way throttle valve 4 through the air inlet 201, the third air passage 30, the air inlet C13, the air inlet B12 and the fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202 and breaks the air in the suction cup 5 at the working port 202, so that the suction cup 5 releases the workpiece. In this embodiment, the valve stem B22 is always in the fourth position, so that the first air passage 10 is always filled with positive pressure gas and the second air passage 20 is always filled with negative pressure gas. When the pneumatic control valve A101 moves from the second position to the first position, the negative pressure gas can quickly enter the fourth air passage 40 through the air port A11 and the air port B12, and then flow to the suction cup 5 after the flow rate is adjusted by the one-way throttle valve 4 to perform the next workpiece gripping operation. This realizes the rapid switching between gripping and releasing workpieces and is suitable for working conditions that require rapid switching of working states.

[0051] In other preferred embodiments, such as Figure 11As shown, when pilot valve B104 is de-energized and pilot valve A103 is energized, valve stem B22 is in the third position, air port D14 is connected to air port E15, and air port D14 is disconnected from air port C13, so gas does not enter pneumatic control valve B102; positive pressure gas flows through pilot valve A103 to the first chamber 23. Since the cross-sectional area of ​​the end of valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of ​​the end of valve stem A21 located in the second chamber 24, valve stem A21 moves from the first position to the second position. Air port B12 and air port C13 are connected. Positive pressure gas enters the one-way throttle valve 4 through air inlet 201, third air passage 30, air port C13, air port B12 and fourth air passage 40. After the flow rate is adjusted by the one-way throttle valve 4, it flows to the working port 202 and breaks the suction cup 5 at the working port 202, so that the suction cup 5 releases the workpiece. It is suitable for situations where the workpiece is released and then picked up again after a certain period of time, i.e., situations where it is not necessary to quickly switch working states.

[0052] In a further preferred embodiment, a compression spring (not shown in the figure) can also be provided in the second chamber 24. One end of the compression spring abuts against valve stem A21, and the other end abuts against valve stem B22. The function of the compression spring is that when the vacuum generator experiences a power outage or gas outage, valve stem A21 and valve stem B22 are reset by the elastic force of the compression spring. Valve stem A21 moves to the first position, and valve stem B22 moves to the third position, increasing the application scenarios of the vacuum generator. For example, when driving the single-acting cylinder 6 to extend, if the vacuum generator experiences a gas outage, the reset spring 414 resets valve stem B22. At this time, the piston rod of the cylinder can be moved manually.

[0053] As another preferred embodiment of the present invention, the working port 202 is provided with a single-acting cylinder 6 or a single-acting pneumatic gripper 7. In this embodiment, as... Figure 12 and Figure 14As shown, when pilot valve B104 is de-energized and pilot valve A103 is energized, valve stem B22 is in the third position, air port D14 is connected to air port E15, and air port D14 is disconnected from air port C13, so gas does not enter the pneumatic control valve B102; positive pressure gas flows through pilot valve A103 to the first chamber 23. Since the cross-sectional area of ​​the end of valve stem A21 located in the first chamber 23 is larger than the cross-sectional area of ​​the end of valve stem A21 located in the second chamber 24, valve stem A21 moves from the first position to the second position. Air port B12 and air port C13 are connected. Positive pressure gas enters the one-way throttle valve 4 through air inlet 201, third air passage 30, air port C13, air port B12 and fourth air passage 40. After the flow rate is regulated by the one-way throttle valve 4, it flows to the working port 202 and drives the piston rod of the single-acting cylinder 6 to extend or drives the single-acting gripper 7 to clamp. In this embodiment, the positive pressure gas flowing out of port B12 enters the one-way throttle valve 4 after passing through the fourth air passage 40. The flow rate is regulated by the one-way throttle valve 4 before flowing to the working port 202, thereby regulating the operating speed of the single-acting cylinder 6. This achieves precise control and distribution of the positive pressure gas, enabling the use of positive pressure gas to drive the single-acting cylinder 6 or the single-acting gripper 7. In this embodiment, when the single-acting cylinder 6 is extended, if the vacuum generator experiences a gas outage, the piston rod of the single-acting cylinder 6 maintains its original position. For example, in a vertically installed single-acting cylinder 6, the workpiece lifted by its piston rod will not suddenly fall due to a vacuum generator outage, improving safety.

[0054] In this embodiment, as Figure 13 and Figure 15 As shown, when both pilot valves B104 and A103 are de-energized, valve stem B22 is in the third position, air port D14 is connected to air port E15, and air port D14 is disconnected from air port C13, so gas does not enter the pneumatic control valve B102; valve stem A21 is in the first position, air port A11 is connected to air port B12, and the piston rod of the single-acting cylinder 6 or the gripper of the single-acting gripper 7 is reset by the elastic force of the compression spring. The positive pressure gas in the single-acting cylinder 6 or the single-acting gripper 7 is discharged through the fourth air passage 40, air port B12, air port A11, second air passage 20, negative pressure outlet 32 ​​and air outlet 35, and then discharged through the silencer 351, thereby realizing the retraction of the piston rod of the single-acting cylinder 6 or the release of the gripper of the single-acting gripper 7.

[0055] In another preferred embodiment of the present invention, the vacuum generating device 3 includes a primary nozzle 33 and a secondary nozzle 34 connected in sequence. The main body module 200 is provided with a primary suction side hole 203 corresponding to the primary nozzle 33 and a secondary suction side hole 204 corresponding to the secondary nozzle 34. A diaphragm 2041 is provided at the secondary suction side hole 204. In this embodiment, as... Figure 4 and Figure 5 As shown, through this bipolar vacuum structural design, especially the organic combination of the primary nozzle 33 and the secondary nozzle 34, the negative pressure generated at the primary nozzle 33 is greater than that at the secondary nozzle 34. Therefore, the primary nozzle 33 is the core of the negative pressure generation. However, the flow rate generated by the primary nozzle 33 is relatively small and cannot quickly generate adsorption. Therefore, the secondary nozzle 34 is used to increase the negative pressure flow rate, improve the vacuum speed, and reduce the consumption of positive pressure gas. When the vacuum degree in the second air passage 20 is greater than the vacuum degree of the secondary suction side hole 204, the diaphragm 2041 closes to avoid weakening the vacuum degree in the second air passage 20.

[0056] In a further preferred embodiment, diaphragms 2041 are provided at both the primary suction side hole 203 and the secondary suction side hole 204. When the suction cup 5 adsorbs the workpiece, the pressure gauge detects that the vacuum level has reached the set value and cuts off the air supply. At this time, the diaphragm 2041 blocks both the primary suction side hole 203 and the secondary suction side hole 204 to achieve the pressure holding function. When the pressure gauge detects that the vacuum level is lower than the set vacuum value, the air supply is opened to achieve the air saving function.

[0057] In another preferred embodiment of the present invention, a one-way throttle valve 4 is provided between the working port 202 and the gas port B12 to regulate the flow rate of positive pressure gas flowing from the gas port B12 to the working port 202. The one-way throttle valve 4 includes a one-way valve 41 and a throttle valve 42, which are arranged in parallel between the working port 202 and the gas port B12. A throttle valve chamber 421 is provided within the main body module 200. A first valve port 422 communicating with the working port 202 is provided within the throttle valve chamber 421. An adjusting rod 423 for adjusting the opening of the first valve port 422 is provided within the throttle valve chamber 421, and the adjusting rod 423 is threadedly connected to the main body module 200. The main module 200 is provided with a one-way valve chamber 411 communicating with the throttle valve chamber 421. The one-way valve chamber 411 is provided with a second valve port 412 communicating with the working port 202. The one-way valve chamber 411 is also provided with a valve core 413 and a spring 414 corresponding to and cooperating with the second valve port 412. The spring 414 ensures that the valve core 413 always has a tendency to close the second valve port 412. In this embodiment, as... Figure 5 and Figure 6As shown, the flow rate of positive pressure gas is regulated by the one-way throttle valve 4, thereby adjusting the magnitude of the venting pressure, the thrust of the piston rod of the single-acting cylinder 6, or the clamping force of the single-acting gripper 7. Specifically, when the positive pressure gas flows through the throttle valve chamber 421, the adjusting rod 423 is rotated to move towards or away from the first valve port 422, thus adjusting the opening of the first valve port 422. Simultaneously, the positive pressure gas enters the one-way valve chamber 411, and the positive pressure gas and the spring 414 together exert a force on the valve core 413 to close the second valve port 412, so that the positive pressure gas can only flow through the throttle valve 42, achieving the throttling function of the positive pressure gas. Meanwhile, the one-way throttle valve 4 does not throttle the negative pressure gas and does not affect the adsorption efficiency. Specifically, when the negative pressure gas flows through the one-way valve chamber 411, the valve core 413 overcomes the elastic force of the spring 414 under the suction force of the negative pressure gas, opening the second valve port 412, thus preventing the negative pressure gas from being affected by the throttle valve 42. In a further preferred embodiment, the main module 200 is provided with a bolt (not shown in the figure) for limiting the disengagement of the adjusting rod 423. The bolt is provided with an umbrella-shaped cap, which abuts against the outermost end of the adjusting rod 423. This structural design prevents the adjusting rod 423 from detaching from the main module 200 under the force of air pressure when it is adjusted to the outermost position. In a further preferred embodiment, an elastic element is provided in the throttle valve chamber 421, which abuts against the adjusting rod 423 to prevent the adjusting rod 423 from loosening under the alternating action of positive and negative pressure gases.

[0058] As another preferred embodiment of the present invention, the main module 200 includes a pressure gauge 8 for detecting the pressure value flowing out of the one-way throttle valve 4. In this embodiment, as... Figure 6 and Figure 8 As shown, the pressure gauge 8 is set to detect the air pressure value flowing from the fourth air passage 40 to the working port 202, so as to realize real-time monitoring of the suction force of the suction cup 5, the thrust of the single-acting cylinder 6, or the clamping force of the single-acting gripper 7.

[0059] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A positive and negative pressure centralized control vacuum generator, comprising a valve assembly module (100) and a main body module (200), characterized in that: The valve assembly module (100) includes a pneumatic control valve A (101) and a pneumatic control valve B (102), both of which are two-position three-way valves; the valve assembly module (100) includes a valve body (1), a valve cavity (2) is provided inside the valve body (1), a valve stem A (21) and a valve stem B (22) are provided inside the valve cavity (2), and the valve body (1) is provided with valves respectively connected to the valve cavity (2). The valve stem A (21) has a first position and a second position. When the valve stem A (21) is in the first position, the air port A (11) is connected to the air port B (12). When the valve stem A (21) is in the second position, the air port B (12) is connected to the air port C (13). 22) It has a third station and a fourth station. When the valve stem B (22) is in the third station, the air port D (14) is connected to the air port E (15). When the valve stem B (22) is in the fourth station, the air port C (13) is connected to the air port D (14). The main module (200) is equipped with a vacuum generator (3). The air inlet (31) of the vacuum generator (3) is connected to the air port D (14) through the first air passage (10). The negative pressure outlet (32) of the vacuum generator (3) is connected to the air port A (11) through the second air passage (20). The main module (200) is equipped with an air inlet (201) and a working port (202). The air inlet (201) is connected to the air port C (13) through the third air passage (30). The working port (202) is connected to the air port B (12) through the fourth air passage (40).

2. The positive and negative pressure centralized control vacuum generator according to claim 1, characterized in that: The valve assembly module (100) further includes pilot valve A (103) and pilot valve B (104). The valve stem A (21) and valve stem B (22) divide the valve chamber (2) into a first chamber (23), a second chamber (24) and a third chamber (25). The first chamber (23) is connected to the pilot valve A (103). The second chamber (24) is connected to the third air passage (30) through the air port C (13). The third chamber (25) is connected to the pilot valve B (104).

3. The positive and negative pressure centralized control vacuum generator according to claim 1, characterized in that: The working port (202) is equipped with a suction cup (5).

4. A positive and negative pressure centralized control vacuum generator according to claim 1, characterized in that: The working port (202) is equipped with a single-acting cylinder (6) or a single-acting gripper (7).

5. A positive and negative pressure centralized control vacuum generator according to claim 1, characterized in that: The vacuum generating device (3) includes a primary nozzle (33) and a secondary nozzle (34) connected in sequence. The main module (200) is provided with a primary suction side hole (203) corresponding to the primary nozzle (33) and a secondary suction side hole (204) corresponding to the secondary nozzle (34). A diaphragm (2041) is provided at the secondary suction side hole (204).

6. A positive and negative pressure centralized control vacuum generator according to claim 1, characterized in that: A one-way throttle valve (4) is provided between the working port (202) and the gas port B (12) to regulate the flow rate of positive pressure gas from the gas port B (12) to the working port (202).

7. A positive and negative pressure centralized control vacuum generator according to claim 6, characterized in that: The one-way throttle valve (4) includes a one-way valve (41) and a throttle valve (42), which are arranged in parallel between the working port (202) and the air port B (12).

8. A positive and negative pressure centralized control vacuum generator according to claim 7, characterized in that: The main module (200) is provided with a throttle valve chamber (421), the throttle valve chamber (421) is provided with a first valve port (422) communicating with the working port (202), the throttle valve chamber (421) is provided with an adjusting rod (423) for adjusting the opening of the first valve port (422), and the adjusting rod (423) is threadedly connected to the main module (200).

9. A positive and negative pressure centralized control vacuum generator according to claim 8, characterized in that: The main module (200) is provided with a one-way valve chamber (411) that communicates with the throttle valve chamber (421). The one-way valve chamber (411) is provided with a second valve port (412) that communicates with the working port (202). The one-way valve chamber (411) is also provided with a valve core (413) and a spring (414) that correspond to and cooperate with the second valve port (412). The spring (414) makes the valve core (413) always have a tendency to close the second valve port (412).

10. A positive and negative pressure centralized control vacuum generator according to claim 6, characterized in that: The main module (200) includes a pressure gauge (8) for detecting the pressure value flowing out from the one-way throttle valve (4).

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