Front guide type blowing assisting system for pneumatic conveying

Abstract

The leading type pneumatic conveying blowing assisting system comprises a linkage blowing assisting device arranged at the position where blocking is prone to happening and a plurality of independent blowing assisting mechanisms arranged at the position where blocking is not prone to happening, and the linkage blowing assisting device comprises a plurality of sets of independent blowing assisting mechanisms which are connected with one another. Through the communicated linkage pipes and the delayed ventilation device in the valve body, all the independent blowing assisting mechanisms in the linkage blowing assisting device can be started in sequence, pneumatic resource waste caused by synchronous opening of all dredging valves when a pipeline is blocked is avoided, the independent blowing assisting mechanisms are installed at the straight section, namely the position not prone to being blocked, and the service life of the independent blowing assisting mechanisms is prolonged. And the linkage blowing assisting device is arranged at the bending position or the reducing position, namely the position where blocking is prone to occurring, so that the system can adapt to conveying pipelines of different shapes and layouts, and the system can be widely applied to various pneumatic conveying scenes through the flexibility, and the special requirements of different industries are met.

Description

Technical Field

[0001] This utility model relates to the technical field of pneumatic conveying evacuation devices, specifically a pre-guided pneumatic conveying auxiliary blowing system. Background Technology

[0002] Pneumatic conveying is a technology that utilizes the energy of airflow to transport granular materials along the airflow direction within a closed pipeline. It is a specific application of fluidization technology, primarily achieving material transport through pressure difference or vacuum suction within the pipeline. It boasts advantages such as simple structure, convenient operation, flexible conveying, strong adaptability, environmental friendliness, cleanliness, high efficiency, and energy saving, and is widely used in industries such as chemical, food, pharmaceutical, building materials, and new energy.

[0003] To prevent blockages in the pipeline during pneumatic conveying, several pneumatic unblocking valves are typically installed on the pipeline. Under normal conveying conditions, these valves do not interfere with the material transport within the pipeline. When a blockage occurs, the valves, under pressure changes, blow high-pressure gas into the pipeline to remove and disperse the blockage. The opening and closing of these valves is automatically controlled by the air pressure inside the pipeline. If a blockage occurs in a section of the pipeline, all the valves in that section will open simultaneously to clear the blockage, making it impossible to control the order in which they open. If only a few valves need to be opened to resolve the blockage, the unnecessary opening of these valves will waste pneumatic resources and increase overall production costs. Utility Model Content

[0004] The purpose of this utility model is to provide a pre-guided pneumatic conveying auxiliary blowing system, which has a linkage auxiliary blowing device installed at the location where blockage is likely to occur, so as to realize the sequential opening of the auxiliary blowing mechanism, thereby saving pneumatic resources and solving the problems in the prior art.

[0005] The technical solution adopted by this utility model to solve its technical problem is: a pre-guided pneumatic conveying auxiliary blowing system, including an auxiliary blowing pipeline, a linkage auxiliary blowing device installed at the bends or diameter reductions of the auxiliary blowing pipeline, and several independent auxiliary blowing mechanisms installed at the straight sections of the auxiliary blowing pipeline. The linkage auxiliary blowing device includes several sets of interconnected independent auxiliary blowing mechanisms, and a connecting linkage pipe is installed between adjacent independent auxiliary blowing mechanisms. Each independent auxiliary blowing mechanism includes a valve body, which is connected to the auxiliary blowing pipeline via a check valve. The valve body has a large valve core cavity, a small valve core cavity, a valve stem cavity, and an exhaust cavity. The exhaust cavity is connected to the check valve and the valve stem cavity. An N-type connecting cavity is formed in the valve body between the small valve core cavity and the valve stem cavity. A delayed ventilation device is installed in the valve body between the N-type connecting cavity and the large valve core cavity. The ventilation device includes an installation cavity within the valve body, a matching sliding block within the installation cavity, and a bent connecting cavity within the sliding block. One end of the bent connecting cavity is always connected to the N-type connecting cavity. The large valve core cavity is connected to the installation cavity via a delayed connecting cavity. A hydraulic damper and a first return spring are provided between the sliding block and the side wall of the installation cavity. The first return spring always tends to push the sliding block closer to the N-type connecting cavity and separate the bent connecting cavity from the delayed connecting cavity. When the air pressure in the N-type connecting cavity rises, it can overcome the elastic force of the hydraulic damper and the first return spring to push the sliding block to move to the point where the bent connecting cavity connects with the delayed connecting cavity. One end of the linkage pipe in the linkage-assisted blowing device is connected to a check valve, and the other end of the linkage pipe passes through the valve cover of an adjacent independent blowing mechanism and is connected to the large valve core cavity. A valve stem is installed in the valve stem cavity. A large valve core is installed at one end of the valve stem in the large valve core cavity, and a small valve core is installed at one end of the valve stem in the small valve core cavity. A valve cover is installed on the valve body at one end of the large valve core cavity. An exhaust hole communicating with the large valve core cavity is opened on the valve body. The exhaust hole and the valve cover are located on both sides of the large valve core. A compression spring seat is also installed in the small valve core cavity. A tensioning spring is installed between the compression spring seat and the small valve core. The tensioning spring always tends to push the small valve core to isolate the small valve core cavity from the valve stem cavity. An air inlet is opened on the compression spring seat. The mounting cavity has a T-shaped slot on its side wall. A T-shaped insert is mounted on the housing of the hydraulic damper, which mates with the T-shaped slot. A recessed groove is also provided on the sliding block, which mates with the piston rod of the hydraulic damper. A partition is also provided inside the T-shaped slot. The T-shaped insert is located above the T-shaped insert. A first return spring is installed in the T-shaped slot below the partition, and the hydraulic damper is located above the first return spring. The hydraulic damper includes a cylindrical housing. A guide rod is installed inside the cylindrical housing. One end of the guide rod extends out of the cylindrical housing and mates with the recessed groove. A piston valve core is provided at the end of the guide rod inside the cylindrical housing. The piston valve core has an oil passage hole. A detachable end cap is provided at the end of the cylindrical housing. The guide rod can extend and retract through the end cap. A second return spring is installed between the piston valve core and the cylindrical housing. The cylindrical housing contains hydraulic oil.A detachable cover is installed on the valve body at the top of the mounting cavity. One end of the cover is hinged to the valve body, and the other end is locked to the mounting cavity by a fastening bolt. A pressure groove is provided at the top of the mounting cavity, and a pressure plate is installed in the groove. The coverage area of ​​the pressure plate is larger than the opening area of ​​the mounting cavity. A sealing gasket is also provided between the pressure plate and the pressure groove. When the cover is fastened, it can push the pressure plate to press against the sealing gasket. A guide block is provided at the bottom of the sliding block, and a guide groove is provided on the bottom wall of the mounting cavity to cooperate with the guide block. The N-type connecting cavity includes two sets of vertically opened vertical air passages and a transverse air passage connecting the vertical air passages. One set of vertical air passages connected to the small valve core cavity is equipped with an airflow regulating bolt, and the other set of vertical air passages connected to the valve stem cavity is equipped with a pressure gauge. The pressure gauge is installed on the valve body by a nut sleeve, which is located above the end of the cover where the fastening bolt is located. The linkage-assisted blowing device includes three sets of interconnected independent blowing mechanisms, and each adjacent independent blowing mechanism is connected by a linkage pipe.

[0006] The positive effects of this utility model are as follows: The pre-guided pneumatic conveying auxiliary blowing system of this utility model includes a linkage auxiliary blowing device set at a location prone to blockage, and several independent auxiliary blowing mechanisms set at locations less prone to blockage. The linkage auxiliary blowing device includes several sets of interconnected independent auxiliary blowing mechanisms. Through the interconnected linkage pipe and the delayed ventilation device inside the valve body, the sequential opening of each independent auxiliary blowing mechanism in the linkage auxiliary blowing device can be realized, avoiding the waste of pneumatic resources caused by the simultaneous opening of all unblocking valves when the pipeline is blocked. The above-mentioned design allows auxiliary blowing to be performed only at the truly needed location and time, which can more effectively blow away the blocking material and improve the unblocking efficiency. This pre-guided auxiliary blowing method can quickly locate and deal with the blockage point, reduce the time that pipeline blockage affects the production process, not only save pneumatic resources, reduce production costs, and improve unblocking efficiency, but also reduce blockage time and effectively reduce the overall production cost. The installation of independent purging mechanisms at straight sections, where blockages are less likely to occur, and the configuration of linked purging devices at bends or reductions in diameter, where blockages are more likely to occur, enable the system to adapt to conveying pipelines of different shapes and layouts. This flexibility allows the system to be widely used in various pneumatic conveying scenarios and meet the special needs of different industries. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of this utility model;

[0008] Figure 2 This is a schematic diagram of the independent blowing mechanism in the linked blowing device;

[0009] Figure 3 yes Figure 2 A magnified view of part of I;

[0010] Figure 4 yes Figure 3 A schematic diagram showing the connection between the bent connecting cavity and the delayed connecting cavity in the structure;

[0011] Figure 5 yes Figure 3 Sectional view along line AA;

[0012] Figure 6 yes Figure 3 Sectional view along the BB direction;

[0013] Figure 7 This is a schematic diagram of three interconnected independent blowing mechanisms in a linkage blowing device. Detailed Implementation

[0014] The present invention describes a pre-guided pneumatic conveying auxiliary blowing system, such as... Figure 1 As shown, it includes a blowing aid pipeline 1, which can be arranged according to the actual layout of the pneumatic conveying pipeline and installed on the pneumatic conveying pipeline to ensure that it can cover all the locations that need to be bleed.

[0015] Linked blowing devices are installed at bends or reductions in diameter of the blowing aid pipeline 1. These locations are more prone to material blockage due to changes in airflow direction or reductions in pipeline cross-sectional area. Therefore, linked blowing devices are installed to more effectively address blockages. Several independent blowing mechanisms are installed at the straight sections of the blowing aid pipeline 1. Blockages are relatively less likely to occur at straight sections, so independent blowing mechanisms are sufficient to meet the requirements.

[0016] The linkage blowing device includes several sets of interconnected independent blowing mechanisms. Each adjacent independent blowing mechanism is connected by a linkage pipe 23. The above design can keep the air pressure of each blowing mechanism in the linkage blowing device consistent, and can be activated in a linkage manner to blow away blockages.

[0017] like Figure 2 As shown, the independent blowing mechanism includes a valve body 2, which is connected to the blowing pipeline 1 via a check valve 3. The check valve 3 ensures that the airflow can only flow in one direction, allowing the high-pressure gas in the valve body 2 to be discharged into the blowing pipeline 1, and preventing the material in the blowing pipeline 1 from flowing back into the valve body 2 and affecting normal use.

[0018] The valve body 2 has a large valve core cavity 4, a small valve core cavity 5, a valve stem cavity 6, and an exhaust cavity 7. The exhaust cavity 7 is connected to the check valve 3 and the valve stem cavity 6, forming a gas flow channel. A valve stem 8 is installed in the valve stem cavity 6 and can move horizontally within it. A matching large valve core 9 is installed at the end of the valve stem 8 located in the large valve core cavity 4, and a matching small valve core 10 is installed at the end of the valve stem 8 located in the small valve core cavity 5.

[0019] A valve cover 11 is installed on the valve body 2 at one end of the large valve core cavity 4. The valve cover 11 is used to seal the large valve core cavity 4. An exhaust hole 12 connected to the large valve core cavity 4 is provided on the valve body 2. The exhaust hole 12 and the valve cover 11 are located on both sides of the large valve core 9. The large valve core 9 isolates the large valve core cavity 4 into two parts. The cavity on the side closer to the valve cover 11 is in a relatively closed state, while the cavity on the other side is connected to the external space of the valve body 2 through the exhaust hole 12, ensuring that the large valve core 9 can perform normal air extraction and exhaust when it moves.

[0020] A spring seat 13 is installed inside the small valve core cavity 5. A tensioning spring 14 is installed between the spring seat 13 and the small valve core 10. The tensioning spring 14 always tends to push the small valve core 10 to isolate the small valve core cavity 5 from the valve stem cavity 6, ensuring that the small valve core cavity 5 and the valve stem cavity 6 are not connected under normal circumstances. An air inlet 15 is provided on the spring seat 13. An N-shaped connecting cavity 16 is provided inside the valve body 2 between the small valve core cavity 5 and the valve stem cavity 6. The air inlet 15 is connected to a high-pressure gas source through a pipeline to realize the normal supply of high-pressure gas inside the valve body 2.

[0021] A delayed ventilation device is installed in the valve body 2 between the N-type connecting cavity 16 and the large valve core cavity 4. The delayed ventilation device is used to control the time when high-pressure gas enters the large valve core cavity 4 from the N-type connecting cavity 16, thereby achieving the delayed opening effect of the blowing mechanism in the linkage blowing device.

[0022] like Figure 3 and Figure 4 As shown, the delayed ventilation device includes a mounting cavity 17 formed within the valve body 2. A matching sliding block 18 is provided within the mounting cavity 17, and the sliding block 18 can move horizontally within the mounting cavity 17. A bent connecting cavity 19 is formed within the sliding block 18, and the movement of the sliding block 18 allows the bent connecting cavity 19 to connect the N-type connecting cavity 16 with the large valve core cavity 4.

[0023] One end of the bent connecting cavity 19 is always connected to the N-type connecting cavity 16. The large valve core cavity 4 is connected to the mounting cavity 17 through the delayed connecting cavity 22. A hydraulic damper 20 and a first return spring 21 are provided between the sliding block 18 and the side wall of the mounting cavity 17. The first return spring 21 always has the tendency to push the sliding block 18 to move closer to the N-type connecting cavity 16 and separate the bent connecting cavity 19 from the delayed connecting cavity 22. When the air pressure in the N-type connecting cavity 16 rises, it can overcome the elastic force of the hydraulic damper 20 and the first return spring 21 to push the sliding block 18 to move to the bent connecting cavity 19 and connect with the delayed connecting cavity 22.

[0024] The hydraulic damper 20 can slow down the movement speed of the sliding block 18, thereby delaying the connection time between the bending connecting cavity 19 and the delay connecting cavity 22, and realizing the delayed opening of the blowing mechanism in the linkage blowing device.

[0025] One end of the linkage pipe 23 in the linkage blowing device is connected to the check valve 3, and the other end of the linkage pipe 23 passes through the valve cover 11 of the adjacent independent blowing mechanism and is connected to the large valve core cavity 4. This design allows the gas pressure to rise in the exhaust chamber 7 of one blowing mechanism, and the gas pressure change can be transmitted to the large valve core cavity 4 of the next blowing mechanism through the linkage pipe 23, thereby realizing the simultaneous response of the linkage blowing device.

[0026] When there is no blockage in the pneumatic conveying pipeline, high-pressure gas enters the small valve core cavity 5 through the air inlet 15. A small portion of the gas enters the valve stem cavity 6 and the exhaust cavity 7 through the N-type connecting cavity 16. The air pressure in the large valve core cavity 4 is equal to the air pressure at the position of the check valve 3. Both ends of the large valve core 9 and the small valve core 10 are subjected to the same air pressure to maintain balance. Under the action of the tightening spring 14, the small valve core 10 isolates the small valve core cavity 5 from the valve stem cavity 6. At the same time, the air pressure in the N-type connecting cavity 16 is insufficient to overcome the elastic force of the first reset spring 21 to move the sliding block 18. The N-type connecting cavity 16 is isolated from the large valve core cavity 4. A small portion of the gas in the exhaust cavity 7 is always discharged into the blowing pipeline 1 through the check valve 3, and it will not affect the normal conveying of materials in the pipeline.

[0027] When a blockage occurs at a bend or reduction in diameter within the blowing aid pipeline 1, such as at the location of the pipeline between two sets of blowing aid mechanisms with a linkage blowing aid device, the blowing aid mechanism located behind the material conveying cannot discharge the gas inside the valve body 2 into the blowing aid pipeline 1, causing the air pressure inside the check valve 3 to rise. Simultaneously, the air pressure inside the valve stem chamber 6 and the N-type connecting chamber 16 of the blowing aid mechanism also increases.

[0028] The blowing mechanism located in front of the blockage position causes the air pressure in the large valve core cavity 4 to rise through the linkage pipe 23. When the pressure of the air pressure in the large valve core cavity 4 on the large valve core 9 is greater than the elastic force of the top spring 14, the valve stem 8 drives the small valve core 10 to move closer to the air inlet 15. The small valve core cavity 5 and the valve stem cavity 6 are instantly connected. The high pressure gas in the small valve core cavity 5 will enter the check valve 3 through the valve stem cavity 6 and the exhaust cavity 7, and form a burst of air in the blowing pipeline 1.

[0029] At this time, after the air pressure in the N-type connecting cavity 16 of the blowing mechanism located behind the material conveying is increased, due to the setting of the delayed ventilation device, the sliding block 18 will not immediately move to connect the N-type connecting cavity 16 with the large valve core cavity 4. Instead, after a short delay, it will connect the N-type connecting cavity 16 with the large valve core cavity 4, pushing the valve stem 8 to move and realize the connection between the small valve core cavity 5 and the valve stem cavity 6, thus completing the burst blowing of the blowing mechanism.

[0030] Due to the setting of the delayed ventilation device, there is a time difference between the bursting of the two sets of blowing mechanisms. If the blowing mechanism at the front of the blockage position can clear the blockage after bursting, the gas inside the valve body 2 can be discharged normally into the pipeline without the gas pressure rising. Then the blowing mechanism at the rear of the material conveying does not need to perform bursting treatment, thereby saving pneumatic resources.

[0031] Furthermore, to facilitate the installation of the hydraulic damper 20, such as... Figure 5 As shown, a T-shaped slot 24 can be provided on the side wall of the mounting cavity 17. A T-shaped insert 25 that mates with the T-shaped slot 24 is installed on the housing of the hydraulic damper 20. The T-shaped slot 24 provides the hydraulic damper 20 with a lower limit insertion space, maintaining a horizontal and stable state while facilitating disassembly and assembly. A countersunk groove 26 that mates with the piston rod of the hydraulic damper 20 is also provided on the sliding block 18, ensuring that the hydraulic damper 20 can produce a directional delay effect on the movement of the sliding block 18. A partition is also provided inside the T-shaped slot 24. The T-shaped insert 25 is located on the upper side of the T-shaped insert 25. A first return spring 21 is installed in the T-shaped slot 24 below the partition. The hydraulic damper 20 is located above the first return spring 21, so that the elastic force of the first return spring 21 can better act on the sliding block 18.

[0032] Furthermore, the hydraulic damper 20 may include a cylindrical housing 35, in which a guide rod 36 is fitted. One end of the guide rod 36 extending out of the cylindrical housing 35 engages with the settling groove 26. A piston valve core 37 is provided at the end of the guide rod 36 inside the cylindrical housing 35. An oil passage hole 38 is provided on the piston valve core 37. A detachable end cap 39 is provided at the end of the cylindrical housing 35. The guide rod 36 can extend and retract through the end cap 39. A second return spring 40 is installed between the piston valve core 37 and the cylindrical housing 35. The cylindrical housing 35 contains hydraulic oil.

[0033] During the movement of the sliding block 18, it needs to overcome the elasticity of the second return spring 40 and the resistance of the hydraulic oil. During the movement of the piston valve core 37, the hydraulic oil will move back and forth in the cavity of the hydraulic damper 20 through the oil passage 38. After the sliding block 18 moves to form an air passage to blow away the blockage, the guide rod 36 will move to the initial position under the action of the second return spring 40.

[0034] Furthermore, a detachable cover 27 can be installed on the valve body 2 at the top of the mounting cavity 17. One end of the cover 27 is hinged to the valve body 2, and the other end of the cover 27 is locked to the mounting cavity 17 by fastening bolts 28. A pressure groove 29 is provided at the top of the mounting cavity 17, and a pressure plate 30 is installed in the pressure groove 29. The coverage area of ​​the pressure plate 30 is larger than the opening area of ​​the mounting cavity 17. A sealing gasket 41 is also provided between the pressure plate 30 and the pressure groove 29. When the cover 27 is fastened, it can push the pressure plate 30 to press against the sealing gasket 41.

[0035] The cover 27 is used to seal the mounting cavity 17, forming a relatively sealed space inside to ensure the normal flow of high-pressure gas. The pressure groove 29 provides installation and limiting space for the pressure plate 30. The squeezing action of the cover 27 on the pressure plate 30 when it is rotated and closed, together with the setting of the sealing gasket 41, further improves the sealing performance of the internal space of the mounting cavity 17.

[0036] Furthermore, to ensure the stability of the sliding block 18 during movement, such as... Figure 6 As shown, the bottom of the sliding block 18 may be provided with a guide block 31, and the bottom wall of the mounting cavity 17 is provided with a guide groove 32 that cooperates with the guide block 31. The above design ensures that the sliding block 18 will not deviate during movement. Before the bent connecting cavity 19 moves to connect with the delay connecting cavity 22, it can ensure that the N-type connecting cavity 16 and the large valve core cavity 4 remain disconnected, thereby playing a corresponding delay role.

[0037] Furthermore, in order to adjust the gas flow rate from the small valve core cavity 5 into the N-type connecting cavity 16 and to monitor the gas pressure changes in the N-type connecting cavity 16 in real time, the N-type connecting cavity 16 includes two sets of vertically opened vertical air passages and a transverse air passage connecting the vertical air passages. One set of vertical air passages connected to the small valve core cavity 5 is equipped with an airflow regulating bolt 33, and the other set of vertical air passages connected to the valve stem cavity 6 is equipped with a pressure gauge 34.

[0038] The pressure gauge 34 is mounted on the valve body 2 via a nut sleeve 42, which is located above the end of the cover 27 where the fastening bolt 28 is located. The pressure gauge 34 is installed after the cover 27 is fastened. The nut sleeve 42 acts as a limit to the cover 27, effectively preventing accidental opening of the cover 27 without removing the pressure gauge 34, thus maintaining relative airtightness within the valve body 2 and ensuring the normal operation of the purging system.

[0039] Furthermore, such as Figure 7As shown, the linkage-assisted blowing device may include three sets of interconnected independent blowing mechanisms. Each adjacent independent blowing mechanism is connected by a linkage pipe 23. This design allows the linkage-assisted blowing device to cover a longer pipe section, improving the blowing effect. Of course, the number of independent blowing mechanisms in the linkage-assisted blowing device can be adjusted according to actual needs.

[0040] The present invention discloses a pre-guided pneumatic conveying auxiliary blowing system, which achieves sequential opening of the auxiliary blowing mechanism through the cooperation of a linkage auxiliary blowing device and an independent auxiliary blowing mechanism, thereby saving pneumatic resources, reducing production costs, improving unblocking efficiency, and reducing blockage time, and has broad application prospects.

[0041] The technical solution of this utility model is not limited to the scope of the embodiments described herein. All technical contents not described in detail herein are publicly known technologies.

Claims

1. A front assisted blow system for pneumatic conveying, characterized by: The application relates to a kind of auxiliary blowing pipelines, linkage auxiliary blowing devices are installed at the bending or reduced diameter of auxiliary blowing pipeline, and several independent auxiliary blowing mechanisms are installed at the straight section of auxiliary blowing pipeline, wherein linkage auxiliary blowing device includes several groups of independent auxiliary blowing mechanisms connected with each other, linkage pipe is installed between adjacent independent auxiliary blowing mechanisms, and the linkage pipe is connected, the independent auxiliary blowing mechanism includes valve body, valve body is connected with auxiliary blowing pipeline by check valve, large valve core cavity, small valve core cavity, valve rod cavity and exhaust cavity are opened in valve body, exhaust cavity is connected with check valve and valve rod cavity, N-shaped communication cavity is opened between small valve core cavity and valve rod cavity in valve body, delay ventilation device is installed between N-shaped communication cavity and large valve core cavity in valve body, the installation cavity is opened in valve body, the sliding block matched is arranged in installation cavity, the bending communication cavity is opened in sliding block, one end of bending communication cavity is always connected with N-shaped communication cavity, large valve core cavity is connected with installation cavity by delay communication cavity, hydraulic damper and first reset spring are arranged between the side wall of sliding block and installation cavity, first reset spring always has the tendency of pushing sliding block to move close to N-shaped communication cavity and separate bending communication cavity from delay communication cavity, when the air pressure in N-shaped communication cavity rises, sliding block can be pushed to move to the position that bending communication cavity is connected with delay communication cavity by overcoming the elastic force of hydraulic damper and first reset spring, one end of linkage pipe in linkage auxiliary blowing device is connected with check valve, the other end of linkage pipe is connected with large valve core cavity by penetrating valve cover of adjacent independent auxiliary blowing mechanism.

2. A system for assisting the flow of air for the pneumatic conveying of material according to claim 1, wherein: Valve rod is matched and installed in valve rod cavity, large valve core is matched and installed at one end of valve rod in large valve core cavity, small valve core is matched and installed at one end of valve rod in small valve core cavity, valve cover is installed on valve body at one end of large valve core cavity, exhaust hole is opened in valve body and connected with large valve core cavity, exhaust hole and valve cover are respectively arranged at the position on both sides of large valve core, compression spring seat is further installed in small valve core cavity, top spring is arranged between compression spring seat and small valve core, the top spring always has the tendency of pushing small valve core to separate small valve core cavity and valve rod cavity, air inlet is opened in compression spring seat.

3. A system as claimed in claim 1, wherein: T-shaped insertion slot is opened in the side wall of installation cavity, T-shaped insertion block matched with T-shaped insertion slot is installed on the shell of hydraulic damper, sunken groove matched with the piston rod of hydraulic damper is further opened in sliding block, the first reset spring is further arranged in T-shaped insertion slot on the lower side of T-shaped insertion block, the first reset spring is arranged on the upper side of hydraulic damper.

4. A draft inducing pneumatic conveying with a draft inducing system according to claim 3, characterized in that: The hydraulic damper includes cylindrical shell, guide rod is matched and installed in the cylindrical shell, the end of guide rod extending out of the cylindrical shell is matched with sunken groove, piston valve core is arranged at the end of guide rod in the cylindrical shell, oil passage is opened in piston valve core, detachable end cover is arranged at the end of cylindrical shell, guide rod can extend out of end cover, second reset spring is arranged between piston valve core and cylindrical shell, and the cylindrical shell contains hydraulic oil.

5. A draft inducing pneumatic conveying with draft inducing system as claimed in claim 1 wherein: The detachable buckle cover is hinged to the valve body at one end and locked to the installation cavity by a fastening bolt at the other end. A pressing groove is formed in the top of the installation cavity, and a pressing plate is fitted in the pressing groove. The covering area of the pressing plate is larger than the opening area of the installation cavity. A sealing gasket is arranged between the pressing plate and the pressing groove. When the buckle cover is buckled, the pressing plate is pushed to press the sealing gasket.

6. A draft inducing pneumatic conveying with draft inducing system as claimed in claim 1 wherein: The bottom of the sliding block is provided with a guide block, and a guide groove matched with the guide block is formed in the bottom wall of the installation cavity.

7. A draft inducing pneumatic conveying with draft boosting system as claimed in claim 5 wherein: The N-shaped communication cavity comprises two groups of vertically arranged vertical air passages and horizontal air passages connected between the vertical air passages. A group of vertical air passages connected with the small valve core cavity is provided with an air flow adjusting bolt, and the other group of vertical air passages connected with the valve rod cavity is provided with an air pressure gauge. The air pressure gauge is installed on the valve body by a nut pressing sleeve, and the nut pressing sleeve is located at the upper side of the end of the buckle cover where the fastening bolt is arranged.

8. A draft inducing pneumatic conveying with draft inducing system as claimed in claim 1 wherein: The linkage blowing assisting device comprises three groups of independent blowing assisting mechanisms connected with each other, and linkage pipes connected with each other are arranged between adjacent independent blowing assisting mechanisms.

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