CN110605734A - A gas-saving expansion-type vacuum generation and suction integrated device and its working method - Google Patents

Abstract

The invention discloses a gas-saving expansion type vacuum generating and absorbing integrated device and its working method. The upper part of the device is a vacuum generating and maintaining structure, the middle part is a pumping and discharging structure, and the bottom is a vacuum absorbing structure; the vacuum generating and maintaining structure includes pressure Spring structure and cylindrical vacuum chamber structure. The cylindrical vacuum chamber structure includes a proximity switch, an upper end cover, a lower end cover, a vacuum cylinder, a piston rod, and a piston. The upper end cover is provided with a proximity switch installation port, a filter port and a piston rod installation. The proximity switch is fixedly installed on the proximity switch installation port and extends into the vacuum cylinder. The lower end of the piston rod is fixedly connected to the piston. The pressure spring structure is sleeved on the outside of the piston rod located outside the vacuum cylinder. 1. Vacuum release one-way valve and auxiliary vacuum generation one-way valve, the vacuum suction structure is arranged below the air extraction structure. The invention has the functions of vacuum generation, absorption, maintenance and release, comprehensive functions, simple structure and low air consumption.

Description

A gas-saving expansion-type vacuum generation and suction integrated device and its working method

technical field

The invention relates to the field of vacuum air material handling, in particular to a gas-saving expansion-type vacuum generation and suction integrated device and a working method thereof.

Background technique

Vacuum suction technology is a very easy-to-master transfer technology and a very reliable assistive technology. The use of vacuum technology for adjustment, control and monitoring can effectively improve the packaging and transportation efficiency of workpieces and parts under automatic, semi-automatic and manual working conditions. However, during the working process of the current vacuum suction device, a large amount of compressed gas is consumed during the vacuum generation and maintenance stages, and this part accounts for a large proportion of the total cost.

Chinese patent 200610040832.1 discloses "a flow self-adjusting jet vacuum generator". The vacuum generator integrates an automatic flow adjustment part. When the vacuum degree reaches the set value, the adjustable cone enters the inside of the Laval tube to reduce the vacuum generator. The effective area of the throat can automatically reduce the air supply flow and automatically adjust the supply flow. The vacuum generator with adjustable flow rate has approximately the same vacuum response characteristics as the common vacuum generator in the vacuum generation stage, and saves energy consumption by about 14.8% in the vacuum maintenance stage. Although this jet vacuum generator achieves the purpose of saving gas to a certain extent, it still uses the traditional vacuum generating device to generate vacuum, which still consumes a large amount of compressed gas during the working process, and only has the function of vacuum generation, vacuum suction and vacuum release. Also need another device to solve, and the structure is bloated and complicated.

Contents of the invention

The object of the present invention is to provide an air-saving type expanding vacuum generation and suction integrated device with small air consumption and its working method.

The technical solution to realize the purpose of the present invention is: an air-saving expansion type vacuum generation and suction integrated device, including an expansion type vacuum generation element, the expansion type vacuum generation element includes three parts: upper, middle and lower, the upper part is the vacuum generation and The maintenance structure, the middle part is a pumping and discharging structure, and the bottom is a vacuum suction structure; the vacuum generating and maintaining structure includes a pressure spring structure and a cylindrical vacuum chamber structure, and the cylindrical vacuum chamber structure includes a proximity switch, an upper end cover, Lower end cover, vacuum cylinder, piston rod, piston, piston sealing ring, vacuum cylinder sealing ring, filter screw, the upper end cover and the lower end cover are fixedly arranged on the upper and lower ends of the vacuum cylinder respectively, and the upper end cover is provided with a proximity switch The installation port, the filter port and the piston rod installation port, the proximity switch is fixedly installed on the proximity switch installation port and extends into the vacuum cylinder, the filter screw is installed on the filter port and has a A through hole, the lower end of the piston rod is inserted into the vacuum cylinder through the piston rod installation port, the end of the piston rod is fixedly connected with the piston, and the piston sealing ring is arranged between the piston and the vacuum cylinder The sealing ring of the vacuum cylinder is arranged at the position where the upper end cover and the lower end cover are in contact with the vacuum cylinder, and the pressure spring structure is sleeved on the outside of the piston rod located outside the vacuum cylinder,

The exhaust gas structure includes a connecting sleeve, a vacuum release check valve and an auxiliary vacuum generating check valve. The upper end of the connecting sleeve is connected to the axial through hole of the lower end cover, and the lower end is connected to the vacuum suction structure. The connecting sleeve An axial through hole is opened, and the two sides of the connecting sleeve are respectively provided with a vacuum release check valve interface and an auxiliary vacuum generation check valve interface connected with the axial through hole. The vacuum release check valve is connected with the vacuum release unit The auxiliary vacuum generation check valve is connected to the auxiliary vacuum generation check valve interface; the vacuum suction structure is arranged below the exhaust gas structure and connects the vacuum through the axial through hole of the connecting sleeve. Connected inside the barrel.

Further, the pressure spring structure includes a spring and a compression spring member, the compression spring member is fixedly sleeved on the outside of the piston rod, the lower end of the spring is against the upper surface of the upper end cover, and the upper end is against the pressure spring. the lower end of the spring.

Further, the cylindrical vacuum chamber structure also includes a filter screen, the filter port is a stepped hole, the filter screen is arranged on the stepped surface of the stepped hole, the filter screw is screwed to the filter port and Its lower surface compresses the filter screen.

Further, the end of the piston rod is fixedly connected with the piston through threads.

Further, the vacuum suction structure includes a fastening nut, a connection head and a vacuum suction cup, the upper end of the connection head is threadedly connected to the lower part of the axial through hole of the connection sleeve, and the lower end of the connection head is connected to the vacuum suction cup. For connection, the fastening nut is sheathed on the outside of the connecting head between the connecting sleeve and the vacuum suction cup to fasten the vacuum suction cup.

Further, a first sealing gasket is provided between the connecting sleeve and the lower end cover, and a second sealing ring is provided between the connecting sleeve and the connecting head.

Further, the material of the vacuum suction cup is nitrile rubber or silicon rubber, and the mouth shape of the suction cup is flat or organ-shaped.

Further, the device also includes three pneumatic circuits, the three pneumatic circuits are the operating cylinder telescopic circuit, the auxiliary vacuum generation circuit and the vacuum release circuit, and the three pneumatic circuits and the air source 21 pass through the oil mist filter 22 and the reducing Pressure valve 23 is connected,

The telescoping circuit of the operating cylinder includes two mufflers 24, a three-position five-way solenoid valve 25, two overflow valves 26 and an operating cylinder 27. The two mufflers 24 and the two overflow valves 26 are respectively connected to three The two ends of the position five-way electromagnetic valve 25, the air inlet of the three-position five-way electromagnetic valve 25 communicate with the air outlet of the pressure reducing valve 23, and the two air inlets of the operating cylinder 27 are respectively connected with two overflow valves 26, The telescopic rod of operating cylinder 27 is threadedly connected with piston rod 1 top,

The auxiliary vacuum generation circuit includes a relay 28, a 24V power supply 29, an auxiliary jet vacuum generator 30 and a vacuum generation valve 31. One end of the relay 28 is connected to the proximity switch 2, and the other end is connected to one end of the 24V power supply 29. The 24V power supply The other end of 29 is connected with the signal receiving part of the vacuum generating valve 31, the air inlet of the auxiliary jet vacuum generator 30 is connected with the gas outlet of the vacuum generating valve 31, and the suction port of the auxiliary jet vacuum generator 30 is connected with the auxiliary vacuum generator. The one-way valve 9 is connected, and the air outlet of the pressure reducing valve 23 is communicated with the air inlet of the vacuum generating valve 31,

The vacuum release circuit includes a vacuum release valve 32 , the air outlet of the decompression valve 23 communicates with the air inlet of the vacuum release valve 32 , and the air outlet of the vacuum release valve 32 is connected with the vacuum release check valve 13 .

According to the working method of the gas-saving expansion type vacuum generation and suction integrated device described above, the following steps are included:

Step 1: Expansion-type vacuum generation stage: In the initial state, the piston is at the top of the vacuum cylinder, and the operating cylinder pushes the piston rod down, driving the device to move down. When the vacuum suction cup touches the workpiece, the piston rod continues to drop to push the piston Move down in the vacuum cylinder until the piston contacts the lower end cover, at this time, most of the air in the vacuum cylinder and the vacuum suction cup is discharged, so that the variable volume of the expansion-type vacuum generating element is minimized; then operate the cylinder to lift upwards, gravity and The combined effect of the spring force makes the vacuum cylinder of the expansion type vacuum generating element with the vacuum suction cup go down. At this time, the internal volume of the expansion type vacuum generating element increases, the air pressure decreases, and a vacuum is generated. The vacuum suction cup realizes vacuum adsorption with the workpiece, and the suction device drives the workpiece move to the station;

Step 2: Vacuum maintenance stage: During the working period of the expanded vacuum generating element, if there is a slight air leakage on the surface of the workpiece and the suction cup, the piston will move upward to further expand the volume to compensate for the slight increase in air pressure, ensuring the maintenance of the vacuum state and the safety of suction; When this state continues and the piston moves to the detection range of the proximity switch, the proximity switch sends out a signal, the relay receives the signal, the vacuum generating valve in the auxiliary air circuit is connected, the auxiliary jet vacuum generator starts to work, and the suction cup It can maintain the required vacuum inside to ensure the safety of the suction operation; if there is no air leakage on the surface of the workpiece and the suction cup, the expansion type vacuum generating element can ensure the vacuum state, and the auxiliary vacuum generator will not start to work;

Step 3: Vacuum release stage: After the workpiece arrives at the station, the vacuum release valve is connected, and the vacuum release check valve is inflated to release the vacuum state, and the workpiece is separated from the vacuum suction cup to complete a working cycle.

Compared with the prior art, the present invention has significant advantages in that:

(1) The present invention changes the traditional way of using a vacuum generator or a vacuum pump to generate vacuum, and uses a cylindrical vacuum cylinder structure to discharge the air in the vacuum cylinder and suction cup by pressing down the piston to generate an initial vacuum and is assisted by the self-weight of the suctioned object Maintaining the vacuum state during the suction process can significantly reduce the air consumption during the working process;

(2) The present invention designs a pressure spring structure. Since the spring is always in a compressed state during the rising phase of the piston, it will provide a pulling force for the upward movement of the piston rod, so that the piston can better overcome the static friction with the inner wall of the vacuum cylinder and can effectively offset the piston and the vacuum cylinder. static friction between

(3) The present invention integrates vacuum generation and vacuum suction structures, has the functions of vacuum generation, suction, maintenance and release, and has comprehensive functions and simple structure;

(4) The present invention can automatically detect the working limit position of the expansion-type vacuum generating element and activate the auxiliary vacuum generating function through the proximity switch, so as to realize the safe and effective operation of the entire vacuum generating and sucking device.

Description of drawings

Fig. 1 is a sectional view of the overall structure and a connection diagram of the pneumatic circuit of the air-saving expansion type vacuum generation and suction integrated device of the present invention.

Fig. 2 is a top view of the upper end cap of the present invention.

Fig. 3 is a sectional view taken along line A-A of Fig. 2 .

Fig. 4 is a top view of the lower end cap of the present invention.

Fig. 5 is a sectional view taken along line B-B of Fig. 4 .

Fig. 6 is a schematic structural view of the piston of the present invention.

Fig. 7 is a top view of the connecting sleeve of the present invention.

Fig. 8 is a sectional view taken along line C-C of Fig. 7 .

Fig. 9 is a front view of the connector of the present invention.

Detailed ways

The implementation of the present invention will be described in detail below in conjunction with specific embodiments.

The idea of the present invention is to generate an initial vacuum by pressing down the piston to discharge the air in the vacuum cylinder and the suction cup, and maintain the vacuum state during the suction process by the self-weight of the object to be sucked. When the vacuum degree in the vacuum cylinder cannot meet the suction requirements, the The auxiliary vacuum generation function is automatically turned on, so as to realize the safe and reliable suction of the device.

Combined with Figure 1-9, a gas-saving expansion type vacuum generation and suction integrated device, including expansion type vacuum generation components and three pneumatic circuits, wherein the expansion type vacuum generation components are divided into upper, middle and lower parts, the upper part is the vacuum generation and The maintenance structure, the middle part is a pumping and discharging structure, and the bottom is a vacuum suction structure; the vacuum generating and maintaining structure includes a pressure spring structure and a cylindrical vacuum chamber structure, and the cylindrical vacuum chamber structure includes a proximity switch 2, an upper end cover 4. Lower end cover 8, vacuum cylinder 5, piston rod 1, piston 6, piston sealing ring 7, vacuum cylinder sealing ring 3, filter screw 18, the upper end cover 4 and lower end cover 8 are respectively fixed on the upper end of the vacuum cylinder 5 and the lower end, with reference to Figure 2-3, the upper end cover 4 is provided with a proximity switch installation port, a filter port and a piston rod installation port, and the proximity switch 2 is fixedly installed on the proximity switch installation port and extends into the vacuum cylinder 5 Inside, the filter screw 18 is installed on the filter port and the filter screw 18 has a through hole in the axial direction, the lower end of the piston rod 1 is inserted into the vacuum cylinder 5 through the piston rod installation port, and the piston The end of the rod 1 is fixedly connected with the piston 6, the piston sealing ring 7 is arranged between the piston 6 and the vacuum cylinder 5, and the vacuum cylinder sealing ring 3 is arranged between the upper end cover 4 and the lower end cover 8 and the vacuum cylinder. 5 contact position, the pressure spring structure is sleeved on the outside of the piston rod 1 outside the vacuum cylinder 5,

The exhaust gas structure includes a connecting sleeve 16, a vacuum release check valve 13 and an auxiliary vacuum generating check valve 9, and the upper end of the connecting sleeve 16 is connected to the axial through hole of the lower end cover 8 (see Figure 4-5) , The lower end is connected with the vacuum suction structure, referring to Fig. 7-8, the connecting sleeve 16 is provided with an axial through hole, and the two sides of the connecting sleeve 16 are respectively provided with a vacuum release check valve interface communicating with the axial through hole and the auxiliary vacuum generation check valve interface, the vacuum release check valve 13 is connected to the vacuum release check valve interface, the auxiliary vacuum generation check valve 13 is connected to the auxiliary vacuum generation check valve interface, and there are 13 vacuum release check valves It can be inflated inwardly, and the auxiliary vacuum generation check valve 9 can only be exhausted outward; the vacuum suction structure is arranged below the exhaust gas structure and passes through the axial through hole of the connecting sleeve 16 and the vacuum cylinder 5 internal connections.

The bottom of the device is a vacuum suction structure, including a vacuum suction cup 12, a connecting head 11 and a fastening nut 10. The vacuum suction cup 12 is installed on the connecting head 11, and the fastening nut 10 is connected to the connecting head 11 by threads, so that the vacuum suction cup 12 is fastened on the On the connecting head 11 , the connecting head 11 is connected to the connecting sleeve 16 through threads, and a sealing ring 14 is arranged between the connecting sleeve 16 and the connecting head 11 .

There are three pneumatic circuits connected to the outside of the air-saving expansion type vacuum generation and suction integrated device, which are the operating cylinder telescopic circuit, auxiliary vacuum generation circuit and vacuum release circuit. The compressed air is discharged from the air source 21 and flows through the oil mist filter 22 and reducing Pressure valve 23 leads into three circuits.

The telescoping circuit of the operating cylinder includes two mufflers 24, a three-position five-way solenoid valve 25, two overflow valves 26 and an operating cylinder 27. The silencer 24 and the overflow valve 26 are respectively connected to the three-position five-way solenoid The two ends of valve 25, two air inlets of operation cylinder 27 are connected with two relief valves 26 respectively, and its telescoping rod is screwed with piston rod 1. Compressed gas enters from the air inlet of the three-position five-way solenoid valve 25, then discharges from the two exhaust ports, flows through the two overflow valves 26 respectively, and is charged into the two air inlets of the operating cylinder 27.

The auxiliary vacuum generation circuit includes a relay 28, a 24V power supply 29, an auxiliary jet vacuum generator 30 and a vacuum generation valve 31. One end of the relay 28 is connected to the proximity switch 2, one end is connected to the 24V power supply 29, and the other end of the 24V power supply is connected to the vacuum generation valve. The signal receiving part of the valve 31 is connected; the air inlet of the auxiliary jet type vacuum generator 30 is connected with the air outlet of the vacuum generating valve 31, and its air extraction port is connected with the auxiliary vacuum generating check valve 9, and the compressed air flows from the outlet of the vacuum generating valve 31. Inlet access.

The vacuum relief circuit includes a vacuum relief valve 32 , compressed air enters through its air inlet, then is discharged from its air outlet, and passes into the vacuum relief one-way valve 13 .

The upper end of the piston rod 1 is provided with an internal thread for connecting with the operating cylinder 27 . Vacuum sucker 12 material adopts acrylonitrile-butadiene rubber or silicon rubber, and sucker mouth shape adopts flat type or organ.

The structure of the piston 6 is shown in FIG. 6 , and the structure of the connecting head 11 is shown in FIG. 9 .

Below in conjunction with accompanying drawing 1 illustrate the concrete work process of the present invention:

1. Expansion vacuum generation stage

In the initial state, the piston 6 is at the top of the vacuum cylinder 5, and the operating cylinder 27 pushes the piston rod 1 to move downward, driving the suction device to move downward. 5 moves downward until the piston 6 contacts the lower end cover 8, at this time, most of the air in the vacuum cylinder 5 and the vacuum suction cup 12 is discharged, so that the variable volume of the expansion-type vacuum generating element is minimized; then operate the cylinder 27 to lift up , the gravity and the spring force work together to make the vacuum cylinder 5 of the expansion type vacuum generating element with the vacuum suction cup 12 go down. At this time, the internal volume of the expansion type vacuum generating element increases, the air pressure decreases, and a vacuum is generated, and the vacuum suction cup 12 realizes vacuum adsorption with the workpiece , the suction device drives the workpiece to move to the station;

2. Vacuum maintenance stage

Operate the cylinder 27 to lift the vacuum suction device. Due to the weight of the workpiece and the slight air leakage, the piston 6 will move upwards in the vacuum cylinder 5 relative to the lower end cover 8. The elastic force of the spring 19 can effectively offset the static friction of the movement of the piston 6. 6 The spring 19 is always in a compressed state during the rising stage, so it will provide a pulling force for the upward movement of the piston rod 1, so that the piston can better overcome the static friction with the inner wall of the vacuum cylinder 5, so it can effectively offset the static friction between the piston and the vacuum cylinder. , a vacuum cavity will be formed between it and the lower end cover 8 to compensate for the vacuum. When the piston 6 moves to the detection range of the proximity switch 2, the proximity switch 2 sends out a signal, and the relay 28 receives the signal, and the vacuum generating valve in the auxiliary air circuit 31 is switched on, and the auxiliary jet vacuum generator 30 starts to work, so that the required vacuum can be maintained in the suction cup to ensure that the suction operation is carried out safely; state, the auxiliary jet vacuum generator 30 will not be started to work;

Step 3: Vacuum release stage: After the workpiece arrives at the station, the vacuum release valve 32 is connected, and the vacuum release check valve 13 is inflated to release the vacuum state, and the workpiece is separated from the vacuum suction cup 12 to complete a working cycle.

This vacuum suction device includes three working states: 1. When the workpiece to be sucked is very light, the vacuum compensated by the vacuum cylinder 5 can meet the working requirements during the movement of the vacuum suction device, and there is no need to open the auxiliary vacuum generating device; 2. When the sucked workpiece is heavy and the vacuum compensated by the vacuum cylinder 5 can no longer meet the working requirements (that is, the piston 6 will move to the detection range of the proximity switch 2), after the piston 6 moves to the detection range of the proximity switch 2, the proximity switch 2 will The signal is sent out to open the auxiliary vacuum generating device to ensure the safe and stable operation of the device; 3. When the air leakage on the surface of the sucked workpiece is serious (for example, the surface of the workpiece is rough and uneven), the piston 6 will also slowly move in the vacuum cylinder 5 when working. Move up until the piston 6 reaches the detection range of the proximity switch 2, the auxiliary vacuum generating device is opened, and the workpiece is sucked by the auxiliary vacuum generating device.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and what described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention will also have other functions without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (9)

1. A gas-saving expansion-type vacuum generating and suction integrated device, including an expansion-type vacuum generating element, characterized in that the expansion-type vacuum generating element includes three parts: upper, middle and lower, the upper part is a vacuum generating and maintaining structure, and the middle part is Air extraction structure, the bottom is a vacuum suction structure; the vacuum generating and maintaining structure includes a pressure spring structure and a cylindrical vacuum chamber structure, and the cylindrical vacuum chamber structure includes a proximity switch (2), an upper end cover (4) , lower end cover (8), vacuum cylinder (5), piston rod (1), piston (6), piston sealing ring (7), vacuum cylinder sealing ring (3), filter screw (18), the upper end cover ( 4) and the lower end cover (8) are fixedly arranged on the upper end and the lower end of the vacuum cylinder (5) respectively, and the upper end cover (4) is provided with a proximity switch installation port, a filter port and a piston rod installation port, and the proximity switch ( 2) fixedly installed on the proximity switch installation port and extending into the vacuum cylinder (5), the filter screw (18) is installed on the filter port and the filter screw (18) has a through hole in the axial direction, so The lower end of the piston rod (1) is inserted into the vacuum cylinder (5) through the piston rod installation port, and the end of the piston rod (1) is fixedly connected with the piston (6), and the piston (6) is connected with the The piston sealing ring (7) is arranged between the vacuum cylinders (5), and the vacuum cylinder sealing ring (3) is arranged at the position where the upper end cover (4) and the lower end cover (8) are in contact with the vacuum cylinder (5), The pressure spring structure is sleeved on the outer side of the piston rod (1) located outside the vacuum cylinder (5), The exhaust gas structure includes a connecting sleeve (16), a vacuum release check valve (13) and an auxiliary vacuum generating check valve (9). Through-hole connection, the lower end is connected to the vacuum suction structure, the connecting sleeve (16) is provided with an axial through hole, and the two sides of the connecting sleeve (16) are respectively provided with a vacuum relief check valve communicating with the axial through hole Interface and auxiliary vacuum generation check valve interface, the vacuum release check valve (13) is connected with the vacuum release check valve interface, and the auxiliary vacuum generation check valve (9) is connected with the auxiliary vacuum generation check valve interface; The vacuum suction structure is arranged under the gas extraction structure and communicates with the inside of the vacuum cylinder (5) through the axial through hole of the connection sleeve (16). 2. The gas-saving expansion-type vacuum generation and suction integrated device according to claim 1, characterized in that, the pressure spring structure includes a spring (19) and a compression spring (20), and the compression spring (20) The spring (19) is fixedly sheathed on the outside of the piston rod (1), and the lower end of the spring (19) abuts against the upper surface of the upper end cover (4), and the upper end abuts against the lower end surface of the compression spring member (20). 3. The gas-saving expansion type vacuum generation and suction integrated device according to claim 1, characterized in that, the cylindrical vacuum chamber structure also includes a filter (17), and the filter port is a stepped hole, so The filter screen (17) is arranged on the stepped surface of the stepped hole, the filter screw (18) is threadedly connected with the filter port and its lower surface presses the filter screen (17). 4. The gas-saving expansion-type vacuum generation and suction integrated device according to claim 1, characterized in that, the end of the piston rod (1) is fixedly connected to the piston (6) through threads. 5. The air-saving expansion type vacuum generation and suction integrated device according to claim 1, characterized in that, the vacuum suction structure includes a fastening nut (10), a connector (11) and a vacuum suction cup (12), the The upper end of the connecting head (11) is threadedly connected with the lower part of the axial through hole of the connecting sleeve (16), the lower end of the connecting head (11) is connected with the vacuum chuck (12), and the fastening nut ( 10) Sleeved on the outside of the connection head (11) between the connection sleeve (16) and the vacuum suction cup (12) to realize the fastening of the vacuum suction cup (12). 6. The air-saving expansion type vacuum generation and suction integrated device according to claim 5, characterized in that, a first sealing gasket (15) is provided between the connecting sleeve (16) and the lower end cover (8), so that A second sealing ring (14) is provided between the connecting sleeve (16) and the connecting head (11). 7. The air-saving expansion-type vacuum generation and suction integrated device according to claim 5, characterized in that, the vacuum suction cup (12) is made of nitrile rubber or silicon rubber, and the mouth shape of the suction cup is flat or organ-shaped. 8. The gas-saving expansion-type vacuum generation and suction integrated device according to any one of claims 1-7, characterized in that the device also includes three pneumatic circuits, and the three pneumatic circuits are the operating cylinder telescopic circuit, Auxiliary vacuum generation circuit and vacuum release circuit, the three pneumatic circuits are connected with the air source (21) through the oil mist filter (22) and the pressure reducing valve (23), The telescoping circuit of the operating cylinder includes two mufflers (24), a three-position five-way solenoid valve (25), two overflow valves (26) and an operating cylinder (27), two mufflers (24) and The two overflow valves (26) are respectively connected to the two ends of the three-position five-way solenoid valve (25), and the air inlet of the three-position five-way solenoid valve (25) communicates with the air outlet of the pressure reducing valve (23). The two air inlets of the cylinder (27) are respectively connected with two overflow valves (26), and the telescopic rod of the operating cylinder (27) is threadedly connected with the top of the piston rod (1). The auxiliary vacuum generating circuit includes a relay (28), a 24V power supply (29), an auxiliary jet vacuum generator (30) and a vacuum generating valve (31), and one end of the relay (28) is connected to the proximity switch (2), The other end is connected to one end of the 24V power supply (29), the other end of the 24V power supply (29) is connected to the signal receiving part of the vacuum generating valve (31), and the air inlet of the auxiliary jet vacuum generator (30) is connected to the vacuum generating valve. The air outlet of (31) is connected, the air extraction port of the auxiliary jet vacuum generator (30) is connected with the auxiliary vacuum generating check valve (9), and the air outlet of the decompression valve (23) is connected with the inlet of the vacuum generating valve (31). The air port is connected, The vacuum relief circuit comprises a vacuum relief valve (32), the air outlet of the pressure reducing valve (23) communicates with the air inlet of the vacuum relief valve (32), and the air outlet of the vacuum relief valve (32) communicates with the vacuum relief one-way valve. (13) CONNECTION. 9. The working method of the gas-saving expansion type vacuum generation and suction integrated device according to claim 8, characterized in that it comprises the following steps: Step 1: Expansion-type vacuum generation stage: In the initial state, the piston (6) is at the top of the vacuum cylinder (5), and the operating cylinder (27) pushes the piston rod (1) to move down, driving the device to move down. After the vacuum chuck (12) touches the workpiece, the piston rod (1) continues to descend and pushes the piston (6) to move downward in the vacuum cylinder (5) until the piston (6) contacts the lower end cover (8). At this time, the vacuum cylinder (5) Most of the air in the vacuum suction cup (12) is discharged to minimize the variable volume of the expansion-type vacuum generating element, and then the cylinder (27) is operated to lift up, and the gravity and spring force work together to make the expansion-type vacuum generating element The vacuum cylinder (5) with the vacuum suction cup (12) goes down, at this time, the internal volume of the expansion type vacuum generating element increases, the air pressure decreases, and a vacuum is generated. The vacuum suction cup (12) realizes vacuum adsorption with the workpiece, and the suction device drives the workpiece to the working position. move; Step 2: Vacuum maintenance stage: During the working period of the expansion-type vacuum generating element, if there is a slight air leakage on the surface of the workpiece and the vacuum chuck (12), the piston (6) will move upward to further expand the volume to compensate for the slight increase in air pressure and ensure the vacuum state When this state continues and the piston (6) moves to the detection range of the proximity switch (2), the proximity switch (2) sends out a signal, the relay (28) receives the signal, and the vacuum generating valve (31) is switched on, and the auxiliary jet vacuum generator (30) starts to work, so that the required vacuum can be maintained in the suction cup. If there is no air leakage on the surface of the workpiece and the vacuum suction cup (12), the expansion type vacuum generating element can ensure the vacuum state , at this time, the auxiliary jet vacuum generator (30) will not be started to work; Step 3: Vacuum release stage: After the workpiece arrives at the station, the vacuum release valve (32) is connected, and the vacuum release check valve (13) is inflated to release the vacuum state, and the workpiece is separated from the vacuum suction cup (12), completing a working cycle.