Pneumatic conveying pipeline auxiliary blowing valve that can be closed with a time delay

Abstract

A pneumatic conveying pipeline auxiliary blowing valve with delayed closing, comprising a valve body. A large piston chamber, a small piston chamber and a communication chamber which are connected and communicated are arranged in the valve body. A large piston is arranged in the large piston chamber, a small piston is arranged in the small piston chamber, and a linkage valve rod is arranged in the communication chamber. The internal cavity can be communicated through the actions of the large piston and the small piston, so as to perform high-pressure blowing into the conveying main pipeline. Moreover, a delayed closing mechanism is installed between the large piston and the small piston. After the blocked materials in the conveying main pipeline are blown out, when the air pressure decreases and drives the large piston to move, one end of the small piston can delay the closing time, so that the inside of the valve body remains in a communicating state and continues to blow air into the conveying main pipeline for a period of time. Compared with the traditional explosion blowing and obstacle clearing valve, it not only avoids repeated opening and closing in a short time, but also greatly reduces the generation of noise and the frequent high-pressure gas impact on the conveying main pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic conveying devices, and more particularly to a pneumatic conveying pipeline auxiliary blowing valve that can be closed with a time delay. Background Art

[0002] Pneumatic conveying, also known as pneumatic transportation, utilizes the energy of air flow to convey granular materials along the air flow direction in a closed pipeline. It is a specific application of fluidization technology. The pneumatic conveying device has a simple structure and convenient operation, and can be used for horizontal, vertical or inclined conveying. During the conveying process, physical operations such as heating, cooling, drying and air classification of materials, or certain chemical operations can be carried out simultaneously, and thus it has been widely used.

[0003] To avoid pipeline blockage during the conveying process, a blow - off and block - clearing valve is generally installed on the main conveying pipeline. Once a blockage occurs in a part of the pipeline, causing local high pressure, the blow - off and block - clearing valve will blow high - pressure gas into the main conveying pipeline. The above - mentioned blowing operation is generally completed instantaneously. Repeated blockages may occur within a short time after the blockage clearing is completed. This requires the blow - off and block - clearing valve to open and close repeatedly, which not only generates continuous noise but also causes frequent high - pressure gas impacts on the main conveying pipeline, and to a certain extent, affects the service life of the main conveying pipeline and the blow - off and block - clearing valve. Summary of the Invention

[0004] The purpose of the present invention is to provide a pneumatic conveying pipeline auxiliary blowing valve that can be closed with a time delay. A time - delay closing mechanism is installed between the large piston and the small piston. After the blockage in the main conveying pipeline is blown away, it can still maintain a connected state and continuously blow air into the main conveying pipeline for a period of time, avoiding repeated opening and closing in a short time, and solving the problems in the prior art.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows: A pneumatic conveying pipeline auxiliary blowing valve that can be closed with a time delay, comprising a valve body. One end of the valve body is provided with a valve cover. A large piston cavity is opened at one end of the valve body near the valve cover, and a small piston cavity is opened at the other end of the valve body far from the valve cover. The large piston cavity and the small piston cavity are connected through a communication cavity. A large piston is installed in the large piston cavity, and a small piston and a compression spring seat are installed in the small piston cavity. The cross-sectional area of the large piston is larger than that of the small piston. The cross-sectional area of the communication cavity is smaller than that of the small piston cavity. A linkage valve rod is installed in the communication cavity. One end of the linkage valve rod is fixedly connected to the large piston, and the other end of the linkage valve rod can contact the small piston. An axially connected hole and a radially connected hole are opened on the linkage valve rod. The axially connected hole is connected to the large piston cavity, and the radially connected hole is connected to the communication cavity. A bypass air passage is opened in the valve body, and the bypass air passage is connected to the communication cavity and the small piston cavity. A first compression spring is installed between the compression spring seat and the small piston. The first compression spring always has a tendency to push the small piston to close the small piston cavity and the communication cavity. A sealing cavity is also opened between the large piston cavity and the communication cavity. A sealing convex edge that matches the sealing cavity is provided on the outer periphery of the linkage valve rod. The diameter of the sealing cavity is larger than that of the communication cavity. A second compression spring is sleeved on the outer periphery of the linkage valve rod on one side of the sealing convex edge. The second compression spring is located in the sealing cavity. An air inlet hole is opened on the compression spring seat, and the air inlet hole is connected to the small piston cavity. An air outlet hole is opened on the valve cover, and the air outlet hole is connected to the large piston cavity. A check valve is installed on the air outlet hole. A time delay closing mechanism is also installed between the large piston and the small piston. The time delay closing mechanism includes an annular groove connected to the small piston cavity. The annular groove is located on the outer periphery of the communication cavity. A fixed annular ring is installed in the annular groove. A rotating annular ring is installed on the side of the fixed annular ring close to the small piston through a bearing. A plurality of bull's eye bearings arranged in a circle are provided on the rotating annular ring. Air passing holes that match the bull's eye bearings are opened on the small piston. A limiting groove is installed in the small piston cavity, and a limiting block that matches the limiting groove is provided on the small piston. The small piston cannot rotate relative to the fixed annular ring. When the bull's eye bearings rotate away from the air passing holes, the air passing holes can conduct the small piston cavity and the communication cavity. A push rod is installed on the rotating annular ring. An arc-shaped groove that matches the push rod is opened in the valve body. A power piston cavity is opened on one side of the arc-shaped groove and is connected. A moving piston is installed in the power piston cavity in a matching manner. The moving piston can extend into the arc-shaped groove to drive the push rod to rotate. A return spring is installed in the arc-shaped groove. The return spring always has a tendency to push the moving piston away from the arc-shaped groove by the push rod, and also has a tendency to rotate the rotating annular ring to make the bull's eye bearings on it match the air passing holes. An air power conveying mechanism and a slow air return mechanism that are linked to the large piston are also provided in the valve body. The slow air return mechanism is connected to the air power conveying mechanism and the power piston cavity. The slow air return mechanism includes a connection port connected to the air power conveying mechanism. A first one-way valve is installed in the connection port. The exhaust port of the first one-way valve is connected to an air supply channel.The air supply channel is connected to the power piston chamber away from one end of the arc-shaped groove. A slow air return channel is also provided between the air supply channel and the connection port. The pneumatic power transmission mechanism includes an oil cylinder, in which a compressible airbag is installed. One end of the oil cylinder is installed and connected to the large piston chamber away from one side of the valve cover through a sealing connection structure. The exhaust port of the airbag is connected to the connection port through a sealing connection structure. The sealing connection structure includes first pipelines arranged at both ends of the oil cylinder, and threaded sleeves are fitted and installed on each first pipeline. A second pipeline is provided in the valve body. One end of the second pipeline is connected to the large piston chamber away from one side of the valve cover, and the other end of the second pipeline is fitted with the threaded sleeve. A third pipeline fitted with the threaded sleeve is installed on the connection port. By rotating the threaded sleeve, the oil cylinder can be fixedly installed between the second pipeline and the third pipeline. When the air pressure in the large piston chamber close to the valve cover side increases, the airbag can be compressed and deliver gas to the air supply channel and the power piston chamber, pushing the moving piston to move closer to the push rod. The pneumatic power transmission mechanism includes an annular chamber opened in the valve body, and an annular piston is fitted and installed in the annular chamber. One side surface of the annular piston is connected to the large piston through a connecting rod. The annular chamber on the other side surface of the annular piston is connected to the connection port through a gas transmission path. An exhaust passage is also opened in the valve body, and the exhaust passage is connected to the large piston chamber away from one side of the valve cover. When the air pressure in the large piston chamber close to the valve cover side increases, the gas in the annular chamber can be compressed and delivered to the gas transmission path, the air supply channel and the power piston chamber, pushing the moving piston to move closer to the push rod. The valve body is composed of a first valve body and a second valve body connected by sealing. The large piston chamber is opened in the first valve body, and the small piston chamber is opened in the second valve body. An annular chamber is opened on the end surface of the second valve body away from the small piston chamber. A delay indicator mechanism is installed in the valve body. The delay indicator mechanism includes an illumination chamber provided on one side of the power piston chamber. An LED lamp bead is installed in the illumination chamber. Corresponding to the position of the LED lamp bead, several transparent glass columns are also provided on the other side of the power piston chamber. Each transparent glass column extends out of the surface of the valve body. The LED lamp bead can illuminate the transparent glass columns, and the moving piston can gradually block each transparent glass column during the moving and resetting process. A first pressure gauge is installed on the air supply channel. A supplementary air channel is also installed on the air supply channel. A second one-way valve and a supplementary air switch are provided on the supplementary air channel. The second one-way valve allows gas outside the valve body to enter the supplementary air channel. A second pressure gauge is installed on the bypass air path. A second flow regulating screw is installed in the valve body. The second flow regulating screw can rotate into the bypass air path, and the second flow regulating screw can control the gas flow rate of the bypass air path entering the communication chamber. The first flow regulating screw is installed at the connection port position of the slow air return channel and the air supply channel. By rotating the first flow regulating screw, the speed of the gas in the power piston chamber flowing back into the pneumatic power transmission mechanism can be adjusted. The elastic force of the second compression spring is greater than that of the first compression spring.,

[0006] The positive effects of the present invention are as follows: A pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing according to the present invention includes a valve body. A large piston chamber, a small piston chamber, and a communication chamber are opened and connected in the valve body. A large piston is arranged in the large piston chamber, a small piston is arranged in the small piston chamber, and a linkage valve rod is arranged in the communication chamber. The communication of the internal cavities can be achieved through the actions of the large piston and the small piston, and then high-pressure blowing can be carried out into the main conveying pipeline. Moreover, a delayed closing mechanism is installed between the large piston and the small piston. After the blocked materials in the main conveying pipeline are blown out, when the air pressure decreases and drives the large piston to move, one end of the small piston can delay the closing time, keeping the inside of the valve body in a connected state and continuously blowing air into the main conveying pipeline for a period of time. Compared with the traditional explosion blowing and obstacle clearing valve, it not only avoids repeated opening and closing in a short time, but also greatly reduces the generation of noise, reduces the frequent high-pressure gas impact on the main conveying pipeline, and also improves the service life of the main conveying pipeline and the explosion blowing and obstacle clearing valve to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic structural view of the present invention;

[0008] Figure 2 is Figure 1 the right view of

[0009] Figure 3 is Figure 2 the sectional view taken along the line A-A in

[0010] Figure 4 is Figure 3 the partial enlarged view of I in

[0011] Figure 5 is Figure 3 the enlarged view of the sectional view taken along the line B-B in

[0012] Figure 6 is Figure 3 the partial enlarged view of II in

[0013] Figure 7 is Figure 4 the schematic view of the state where the structure in conducts the small piston chamber and the communication chamber;

[0014] Figure 8 is a schematic structural view of a pneumatic conveying mechanism;

[0015] Figure 9 is a schematic structural view of another pneumatic conveying mechanism installed on the present invention;

[0016] Figure 10 is Figure 9 the sectional view taken along the line C-C in

[0017] Figure 11 isFigure 9 Schematic diagram of the state where the middle structure conducts the small piston chamber and the communication chamber;

[0018] Figure 12 It is a schematic diagram of the present invention in the working state;

[0019] Figure 13 It is another schematic diagram of the present invention in the working state. Detailed implementation manners

[0020] A pneumatic conveying pipeline auxiliary blowing valve capable of delaying closing according to the present invention, as Figure 1-12 shown, includes a valve body 1. A valve cover 2 is installed at one end of the valve body 1. A large piston chamber 3 is provided at one end of the valve body 1 close to the valve cover 2. A small piston chamber 4 is provided at the other end of the valve body 1 away from the valve cover 2. The large piston chamber 3 and the small piston chamber 4 are connected through a communication chamber 5. A large piston 6 is installed in the large piston chamber 3. A small piston 7 and a compression spring seat 8 are installed in the small piston chamber 4. The cross-sectional area of the large piston 6 is larger than that of the small piston 7. The cross-sectional area of the communication chamber 5 is smaller than that of the small piston chamber 4.

[0021] A linkage valve rod 9 is installed in the communication chamber 5. One end of the linkage valve rod 9 is fixedly connected to the large piston 6. The other end of the linkage valve rod 9 can contact the small piston 7. An axially connected axial hole 10 and a radial hole 11 are provided on the linkage valve rod 9. The axial hole 10 communicates with the large piston chamber 3, and the radial hole 11 communicates with the communication chamber 5. The movement of the small piston 7 in the small piston chamber 4 can realize whether the small piston chamber 4 communicates with the communication chamber 5. When the side surface of the small piston 7 is tightly fitted against the end face of the communication chamber 5, the small piston chamber 4 and the communication chamber 5 cannot communicate. When the linkage valve rod 9 pushes the small piston 7 to separate it from the end face of the communication chamber 5, the small piston chamber 4 communicates with the communication chamber 5, and at the same time, it also communicates with the large piston chamber 3.

[0022] A first compression spring 12 is installed between the compression spring seat 8 and the small piston 7. The first compression spring 12 always has a tendency to push the small piston 7 to close the small piston chamber 4 and the communication chamber 5. A sealing chamber 13 is also provided between the large piston chamber 3 and the communication chamber 5. A sealing convex edge 14 is provided on the outer periphery of the linkage valve rod 9 to cooperate with the sealing chamber 13. The diameter of the sealing chamber 13 is larger than that of the communication chamber 5. A second compression spring 15 is sleeved on the outer periphery of the linkage valve rod 9 on one side of the sealing convex edge 14. The second compression spring 15 is located in the sealing chamber 13. The second compression spring 15 always has a tendency to move the large piston 6 away from the sealing chamber 13 to reset.

[0023] An air inlet 16 is provided on the compression spring seat 8, and the air inlet 16 is connected to the small piston chamber 4. An air outlet 17 is provided on the valve cover 2, and the air outlet 17 is connected to the large piston chamber 3. A check valve 56 is installed on the air outlet 17, wherein the air inlet 16 is connected to the high-pressure gas source, and the check valve 56 is connected to the main delivery pipeline.

[0024] When blockage occurs in the main delivery pipeline, the air pressure in the large piston chamber 3 increases. When the gas pressure on the large piston 6 is greater than the gas pressure on the small piston 7 and the elastic force of the first compression spring 12 and the second compression spring 15, the large piston 6 drives the linkage valve stem 9 to push the small piston 7 open. At this time, the small piston chamber 4, the connecting chamber 5 and the large piston chamber 3 are connected. A large amount of high-pressure gas in the small piston chamber 4 can enter the large piston chamber 3 and effectively blow out the blockage in the main delivery pipeline. Once the blockage is blown away and the air pressure in the large piston chamber 3 is reduced, under the elastic force of the first compression spring 12 and the second compression spring 15, the large piston 6 and the small piston 7 can move and reset, closing the conduction state between the small piston chamber 4 and the connecting chamber 5. In order to avoid the instantaneous closure of the above-mentioned conduction state, the high-pressure gas can be continuously blown away for a period of time after the blockage is cleared. A delayed closing mechanism is also installed between the large piston 6 and the small piston 7, wherein the delayed closing mechanism can delay the movement and reset of the small piston 7. After the large piston 6 completes the movement and reset, there is still a connecting space between the small piston 7 and the end face of the connecting chamber 5, maintaining the conduction state for a period of time to blow the high-pressure gas into the main conveying pipeline, and then pushing the small piston 7 to move and reset, realizing the closure between the small piston chamber 4 and the connecting chamber 5, and ending the entire blowing operation process.

[0025] The delayed closing mechanism includes an annular groove 18 connected to the small piston chamber 4, the annular groove 18 is located on the outer periphery of the connecting chamber 5, a fixed annular ring 19 is installed in the annular groove 18, and a rotating annular ring 20 is installed on the side of the fixed annular ring 19 close to one end of the small piston 7 through a bearing, and the rotating annular ring 20 can rotate relative to the fixed annular ring 19.

[0026] The rotating annular ring 20 is provided with a plurality of bull's eye bearings 21 arranged circumferentially, and the small piston 7 is provided with air holes 22 matched with the bull's eye bearings 21 . The arrangement of the bull's eye bearings 21 can reduce the rotational friction between the small piston 7 and the rotating annular ring 20 .

[0027] In order to prevent the small piston 7 from rotating with the rotating annular ring 20, a limiting groove 23 is installed in the small piston cavity 4, and a limiting block 24 matching the limiting groove 23 is provided on the small piston 7, so that the small piston 7 will not rotate relative to the fixed annular ring 19.

[0028] The bull's-eye bearing 21 extends out of the annular groove 18 and is located in the small piston chamber 4. When the bull's-eye bearing 21 rotates away from the air passage hole 22, the side surface of the small piston 7 cannot be closely attached to the end surface of the communication chamber 5. Through the connection of the air passage hole 22, continuous conduction between the small piston chamber 4 and the communication chamber 5 can be achieved. If each bull's-eye bearing 21 on the rotating annular ring 20 is respectively matched with the air passage hole 22, under the elastic force of the first compression spring 12, the side surface of the small piston 7 is closely matched with the end surface of the communication chamber 5, and the conduction between the communication chamber 5 and the small piston chamber 4 is closed.

[0029] To realize the rotation of the rotating annular ring 20, a push rod 26 is installed on the rotating annular ring 20. An arc-shaped groove 27 matched with the push rod 26 is opened in the valve body 1. A power piston chamber 28 communicated with the arc-shaped groove 27 is opened on one side of the arc-shaped groove 27. A moving piston 29 is installed in the power piston chamber 28 in a matching manner. The moving piston 29 can extend into the arc-shaped groove 27 to drive the push rod 26 to rotate. A return spring 25 is installed in the arc-shaped groove 27. The return spring 25 always has a tendency to push the moving piston 29 away from the arc-shaped groove 27 by the push rod 26, and also has a tendency to rotate the rotating annular ring 20 until the bull's-eye bearing 21 on it is matched with the air passage hole 22.

[0030] To realize the air power input to the end of the moving piston 29 away from the push rod 26, and to make the rotating annular ring 20 slowly reset, so as to achieve the effect of delaying the closing in the blowing state, an air power transmission mechanism and a slow air return mechanism linked with the large piston 6 are also provided in the valve body 1. The slow air return mechanism is communicated with the air power transmission mechanism and the power piston chamber 28. The air power transmission mechanism can be linked with the large piston 6. When the large piston 6 moves, the air power transmission mechanism can input gas into the power piston chamber 28 through the slow air return mechanism, and push the rotating annular ring 20 to rotate, so as to realize the continuous conduction between the communication chamber 5 and the small piston chamber 4. And due to the existence of the slow air return mechanism, the rotating annular ring 20 can rotate and reset slowly. After maintaining the conduction state for a period of time, it finally resets to the closed state.

[0031] The slow air return mechanism includes a connection port 30 communicated with the air power transmission mechanism. A first one-way valve 31 is installed in the connection port 30. An air delivery channel 32 is communicated with the exhaust port of the first one-way valve 31. The air delivery channel 32 is communicated with the power piston chamber 28 at the end away from the arc-shaped groove 27. A slow air return channel 33 is also provided between the air delivery channel 32 and the connection port 30. A first flow regulating screw 34 is installed at the connection port position of the slow air return channel 33 and the air delivery channel 32. Rotating the first flow regulating screw 34 can adjust the speed of the gas in the power piston chamber 28 flowing back into the air power transmission mechanism.

[0032] The gas transported by the pneumatic conveying mechanism can enter the air supply channel 32 through the first one-way valve 31 and cannot flow back in the reverse direction. After the gas enters the power piston chamber 28, it can push the moving piston 29 to rotate the rotating annular ring 20. Then, during the rotation and resetting process, since the reflux gas can only pass through the slow gas return channel 33 with a smaller cross-sectional area and enter the connection port 30, under the blocking effect of the gas, the moving piston 29 resets slowly and cannot instantaneously rotate and reset the rotating annular ring 20 through the reset spring 25, thereby realizing the continuous conduction between the communication chamber 5 and the small piston chamber 4. A limiting convex edge can also be arranged in the power piston chamber 28 to play a limiting role when the moving piston 29 moves and resets.

[0033] When a blockage occurs in the main conveying pipeline, the actions of the components in the pneumatic conveying pipeline blow - assist valve that can be delayed to close are as follows: The air pressure in the large piston chamber 3 increases due to the blockage, pushing the large piston 6 to move closer to the sealing chamber 13 against the elastic force of the second compression spring 15. The linkage valve rod 9 pushes the small piston 7 to move against the elastic force of the first compression spring 12, causing the air passage hole 22 on the small piston 7 to disengage from the bull - eye bearing 21. The small piston chamber 4 is communicated with the communication chamber 5 and the large piston chamber 3, and high - pressure gas is blown into the main conveying pipeline.

[0034] At the same time, the moving large piston 6 causes the pneumatic conveying mechanism to fill the slow gas return mechanism with gas. The gas enters the power piston chamber 28 through the air supply channel 32, pushing the moving piston 29 to move closer to the arc - shaped groove 27, that is, driving the push rod 26 and the rotating annular ring 20 to rotate against the elastic force of the reset spring 25, causing the bull - eye bearing 21 on the rotating annular ring 20 to deflect out of correspondence with the air passage hole 22.

[0035] When the blocked part is cleared, the air pressure in the large piston chamber 3 decreases. Under the action of the elastic force of the second compression spring 15, the large piston 6 moves away from the sealing chamber 13 and resets. The linkage valve rod 9 moves synchronously and loses the pushing restriction on the small piston 7. Under the action of the elastic force of the first compression spring 12, the small piston 7 moves closer to the communication chamber 5. However, since the bull - eye bearing 21 and the air passage hole 22 do not correspond, the side surface of the small piston 7 cannot be closely attached to the end surface of the communication chamber 5, and the small piston chamber 4 and the communication chamber 5 still remain in conduction, and the high - pressure gas continues to be output.

[0036] Meanwhile, the reset large piston 6 causes the pneumatic power transmission mechanism to draw back the supplementary gas in the power piston chamber 28. Due to the setting of the first one-way valve 31 and the slow air return channel 33, the gas in the power piston chamber 28 can only be drawn back slowly, that is, the moving piston 29 moves away from the power piston chamber 28 on the side of the arc-shaped groove 27, and its air pressure gradually decreases, and the thrust acting on the moving piston 29 gradually decreases. Once the thrust acting on the moving piston 29 is less than the elastic force of the reset spring 25, the rotating annular ring 20 will rotate and reset until the bull's-eye bearing 21 on it rotates to cooperate with the air passage hole 22. After the limit of the bull's-eye bearing 21 is lost, the small piston 7 will reset and move to the end face of the communication chamber 5 under the elastic force of the first compression spring 12, cutting off the conduction between the small piston chamber 4 and the communication chamber 5 and switching to the closed state. Before the above closed state is achieved, since the rotating annular ring 20 does not complete the rotational reset instantaneously, a delayed closing can be achieved, maintaining a continuous ventilation state for a period of time.

[0037] Further, the pneumatic power transmission mechanism includes an oil cylinder 35. A groove matching with the oil cylinder 35 can be opened in the valve body 1, and the oil cylinder 35 is installed in the groove. An airbag 36 that can be compressed is installed in the oil cylinder 35. One end of the oil cylinder 35 is installed and communicated with the large piston chamber 3 on the side away from the valve cover 2 through a sealed connection structure. The exhaust port of the airbag 36 is communicated with the connection port 30 through a sealed connection structure. The hydraulic oil in the oil cylinder 35 can enter the large piston chamber 3 on the side away from the valve cover 2.

[0038] When a blockage occurs in the main delivery pipeline, the air pressure in the large piston chamber 3 on the side close to the valve cover 2 increases, pushing the large piston 6 to move closer to the sealing chamber 13, pushing the hydraulic oil into the oil cylinder 35. The airbag 36 is compressed by the hydraulic oil and contracts, discharging the gas in it into the air supply channel 32 and the power piston chamber 28, increasing the air pressure in the power piston chamber 28, causing the moving piston 29 to move closer to the push rod 26, thereby causing the rotating annular ring 20 to rotate.

[0039] After the blockage is cleared, the air pressure in the large piston chamber 3 on the side close to the valve cover 2 decreases, and the large piston 6 moves back to its original position. During the above process, the hydraulic oil in the oil cylinder 35 will enter the large piston chamber 3 on the side away from the valve cover 2, reducing the pressure borne by the airbag 36, slowly exhausting air from the power piston chamber 28, and causing the small piston 7 to close with a delay.

[0040] To facilitate the installation of the oil cylinder 35 on the valve body 1, the sealing connection structure includes first pipelines 37 provided at both ends of the oil cylinder 35. Threaded sleeves 38 are fitted and installed on each first pipeline 37, and the threaded sleeves 38 can be adjusted and moved along the axial direction of the first pipelines 37. A second pipeline 39 is provided in the valve body 1. One end of the second pipeline 39 communicates with the large piston chamber 3 on the side away from the valve cover 2, and the other end of the second pipeline 39 cooperates with the threaded sleeve 38. A third pipeline 40 that cooperates with the threaded sleeve 38 is installed on the connection port 30. By rotating the threaded sleeve 38, the oil cylinder 35 can be fixedly installed between the second pipeline 39 and the third pipeline 40. The distance between the second pipeline 39 and the third pipeline 40 matches the length distance between the two first pipelines 37. The oil cylinder 35 can be directly placed between the second pipeline 39 and the third pipeline 40 for connection and installation. A sealing ring can also be provided at the end of the first pipeline 37 to ensure the sealing performance of the hydraulic oil and gas transmission.

[0041] Furthermore, the pneumatic power transmission mechanism may further include an annular chamber 41 opened in the valve body 1. An annular piston 42 is fitted and installed in the annular chamber 41. One side surface of the annular piston 42 is connected to the large piston 6 through a connecting rod 44. The annular chamber 41 on the other side surface of the annular piston 42 is connected to the connection port 30 through a transmission air path 43. An exhaust passage 45 is also opened in the valve body 1, and the exhaust passage 45 communicates with the large piston chamber 3 on the side away from the valve cover 2.

[0042] When a blockage occurs in the main transmission pipeline, the air pressure in the large piston chamber 3 near the valve cover 2 increases. When the large piston 6 is pushed to move closer to the sealing chamber 13, the connecting rod 44 synchronously pushes the annular piston 42 to move, allowing the gas in the annular chamber 41 to be discharged into the transmission air path 43, the air supply passage 32, and the power piston chamber 28, increasing the air pressure in the power piston chamber 28, causing the moving piston 29 to move closer to the push rod 26, thereby causing the rotating annular ring 20 to rotate.

[0043] After the blockage is cleared, the air pressure in the large piston chamber 3 near the valve cover 2 decreases, the large piston 6 moves back to its original position, the connecting rod 44 synchronously drives the annular piston 42 to move back to its original position, slowly pumping air out of the power piston chamber 28, causing the small piston 7 to close with a time delay.

[0044] To facilitate the machining and manufacturing of the above pneumatic power transmission mechanism in the valve body 1, the valve body 1 is composed of a first valve body and a second valve body that are hermetically connected. The large piston chamber 3 is opened in the first valve body, the small piston chamber 4 is opened in the second valve body, and the annular chamber 41 is opened on the end face of the second valve body at the end away from the small piston chamber 4.

[0045] Further, in order to enable the staff to observe the delayed closing state from the outer surface of the valve body, a delayed indicator mechanism is installed in the valve body 1. The delayed indicator mechanism includes an illumination chamber 46 provided on one side of the power piston chamber 28. An LED lamp bead 47 is installed in the illumination chamber 46. Corresponding to the position of the LED lamp bead 47, a number of transparent glass columns 48 are further provided on the other side of the power piston chamber 28. Each transparent glass column 48 extends out of the surface of the valve body 1. The LED lamp bead 47 can illuminate the transparent glass columns 48, and the moving piston 29 can gradually block each transparent glass column 48 during the moving and resetting process.

[0046] When the moving piston 29 is pushed by the gas into the arc groove 27, the moving piston 29 will not block the transparent glass columns 48, and the LED lamp bead 47 can illuminate all the transparent glass columns 48. When delayed closing occurs, the moving piston 29 gradually moves and resets, and will gradually block the transparent glass columns 48 during the moving and resetting process. From the outside of the valve body, when delayed closing occurs, all the illuminated transparent glass columns 48 will go out one by one, playing a role similar to a countdown reminder. When all the transparent glass columns 48 go out, it indicates that the valve body is in the closed state.

[0047] Further, in order to monitor the air pressure in the air supply passage 32 in real time and ensure that the gas input into the power piston chamber 28 can push the moving piston 29 to move close to the push rod 26 to realize the delayed closing function, a first pressure gauge 49 is installed on the air supply passage 32. The first pressure gauge 49 can monitor the air pressure value in the air supply passage 32 in real time. A supplementary air passage 50 is also installed on the air supply passage 32. A second one-way valve 51 and a supplementary air switch 52 are provided on the supplementary air passage 50. The second one-way valve 51 allows the gas outside the valve body 1 to enter the supplementary air passage 50. When the value monitored by the first pressure gauge 49 is less than the set value, the supplementary air switch 52 can be opened, and the outside gas can enter the air supply passage 32 through the second one-way valve 51 for supplementation by using a supplementary air device.

[0048] Further, in order to facilitate the real-time monitoring of the air pressure in the communication chamber 5, a bypass air passage 53 is opened in the valve body 1. The bypass air passage 53 is communicated with the communication chamber 5 and the small piston chamber 4. A second pressure gauge 54 is installed on the bypass air passage 53. The second pressure gauge 54 can display the air pressure value in the communication chamber 5 in real time. A second flow regulating screw 55 is installed in the valve body 1. The second flow regulating screw 55 can rotate into the bypass air passage 53. The second flow regulating screw 55 can control the gas flow entering the communication chamber 5 from the bypass air passage 53.

[0049] Further, the elastic force of the second compression spring 15 is greater than that of the first compression spring 12. When the valve body 1 closes with a time delay inside, the second compression spring 15 pushes the large piston 6 to move and reset first, and the first compression spring 12 pushes the small piston 7 to move and reset. During the process of the small piston 7 moving and resetting, its end face contacts the bull's-eye bearing 21. The relatively small elastic force of the compression spring can effectively reduce the frictional force between the bull's-eye bearing 21 on the rotating annular ring 20 and the small piston 7, so that the bull's-eye bearing 21 can rotate smoothly to cooperate with the air passage hole 22, and the small piston 7 disconnects the small piston chamber 4 and the communication chamber 5.

[0050] The technical solution of the present invention is not limited within the scope of the embodiments described in the present invention. The technical content not described in detail in the present invention is well-known technology.

Claims

1. A pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing, comprising a valve body (1), Characterized in that: One end of the valve body (1) is installed with a valve cover (2). One end of the valve body (1) close to the valve cover (2) is provided with a large piston chamber (3). The other end of the valve body (1) far from the valve cover (2) is provided with a small piston chamber (4). The large piston chamber (3) and the small piston chamber (4) are connected through a communication chamber (5). A large piston (6) is installed in the large piston chamber (3). A small piston (7) and a compression spring seat (8) are installed in the small piston chamber (4). The cross-sectional area of the large piston (6) is larger than that of the small piston (7). The cross-sectional area of the communication chamber (5) is smaller than that of the small piston chamber (4). A linkage valve rod (9) is installed in the communication chamber (5). One end of the linkage valve rod (9) is fixedly connected to the large piston (6). The other end of the linkage valve rod (9) can contact the small piston (7). An axially connected axial hole (10) and a radial hole (11) are provided on the linkage valve rod (9). The axial hole (10) is connected to the large piston chamber (3), and the radial hole (11) is connected to the communication chamber (5). A bypass air passage (53) is provided in the valve body (1). The bypass air passage (53) is connected to the communication chamber (5) and the small piston chamber (4). A first compression spring (12) is installed between the compression spring seat (8) and the small piston (7). The first compression spring (12) always has a tendency to push the small piston (7) to close the small piston chamber (4) and the communication chamber (5). A sealing chamber (13) is also provided between the large piston chamber (3) and the communication chamber (5). A sealing convex edge (14) matching the sealing chamber (13) is provided on the outer periphery of the linkage valve rod (9). The diameter of the sealing chamber (13) is larger than that of the communication chamber (5). A second compression spring (15) is sleeved on the outer periphery of the linkage valve rod (9) on one side of the sealing convex edge (14). The second compression spring (15) is located in the sealing chamber (13). An air inlet hole (16) is provided on the compression spring seat (8). The air inlet hole (16) is connected to the small piston chamber (4). An air outlet hole (17) is provided on the valve cover (2). The air outlet hole (17) is connected to the large piston chamber (3). A check valve (56) is installed on the air outlet hole (17). A delay closing mechanism is also installed between the large piston (6) and the small piston (7). The delay closing mechanism includes an annular groove (18) connected to the small piston chamber (4). The annular groove (18) is located on the outer periphery of the communication chamber (5). A fixed annular ring (19) is installed in the annular groove (18). A rotating annular ring (20) is installed on the side of the fixed annular ring (19) close to the small piston (7) through a bearing. A plurality of bull's-eye bearings (21) arranged circumferentially are provided on the rotating annular ring (20). An air passage hole (22) matching the bull's-eye bearings (21) is provided on the small piston (7). A limiting groove (23) is installed in the small piston chamber (4). A limiting block (24) matching the limiting groove (23) is provided on the small piston (7). The small piston (7) cannot rotate relative to the fixed annular ring (19). When the bull's-eye bearings (21) rotate away from the air passage hole (22),The air vent hole (22) can conduct the small piston chamber (4) and the communication chamber (5). A push rod (26) is installed on the rotating annular ring (20). An arc-shaped groove (27) matching with the push rod (26) is formed in the valve body (1). A power piston chamber (28) communicating with the arc-shaped groove (27) is formed on one side of the arc-shaped groove (27). A moving piston (29) is installed in the power piston chamber (28) in a matching manner. The moving piston (29) can extend into the arc-shaped groove (27) to drive the push rod (26) to rotate. A return spring (25) is installed in the arc-shaped groove (27). The return spring (25) always has a tendency to push the moving piston (29) away from the arc-shaped groove (27) by the push rod (26), and also has a tendency to rotate the rotating annular ring (20) to a position where the bull's-eye bearing (21) on it cooperates with the air vent hole (22). An air power transmission mechanism and a slow air return mechanism linked to the large piston (6) are also provided in the valve body (1). The slow air return mechanism is communicated with the air power transmission mechanism and the power piston chamber (28). The slow air return mechanism includes a connection port (30) communicated with the air power transmission mechanism. A first one-way valve (31) is installed in the connection port (30). An air supply channel (32) is communicated with the exhaust port of the first one-way valve (31). The air supply channel (32) is communicated with the power piston chamber (28) at the end far from the arc-shaped groove (27). A slow air return channel (33) is also provided between the air supply channel (32) and the connection port (30).

2. The pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing according to claim 1, Characterized in that: The pneumatic power transmission mechanism includes an oil cylinder (35), in which a compressible airbag (36) is installed. One end of the oil cylinder (35) is installed and communicated with the large piston chamber (3) on the side away from the valve cover (2) through a sealed connection structure. The exhaust port of the airbag (36) is communicated with the connection port (30) through a sealed connection structure. The sealed connection structure includes first pipelines (37) arranged at both ends of the oil cylinder (35), and threaded sleeves (38) are fitted and installed on each first pipeline (37). A second pipeline (39) is arranged in the valve body (1). One end of the second pipeline (39) is communicated with the large piston chamber (3) on the side away from the valve cover (2), and the other end of the second pipeline (39) is matched with the threaded sleeve (38). A third pipeline (40) matched with the threaded sleeve (38) is installed on the connection port (30). By rotating the threaded sleeve (38), the oil cylinder (35) can be fixedly installed between the second pipeline (39) and the third pipeline (40). When the air pressure in the large piston chamber (3) on the side close to the valve cover (2) increases, the airbag (36) can be compressed and convey gas into the air supply channel (32) and the power piston chamber (28), pushing the moving piston (29) to move closer to the push rod (26).

3. The pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing according to claim 1, Characterized in that: The pneumatic power transmission mechanism includes an annular chamber (41) opened in the valve body (1), and an annular piston (42) is fitted and installed in the annular chamber (41). One side surface of the annular piston (42) is connected to the large piston (6) through a connecting rod (44). The annular chamber (41) on the other side surface of the annular piston (42) is communicated with the connection port (30) through a conveying air path (43). An exhaust passage (45) is also opened in the valve body (1), and the exhaust passage (45) is communicated with the large piston chamber (3) on the side away from the valve cover (2). When the air pressure in the large piston chamber (3) on the side close to the valve cover (2) increases, the gas in the annular chamber (41) can be compressed and convey gas into the conveying air path (43), the air supply channel (32) and the power piston chamber (28), pushing the moving piston (29) to move closer to the push rod (26).

4. The pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing according to claim 3, Characterized in that: The valve body (1) is composed of a first valve body and a second valve body connected by sealing. The large piston chamber (3) is opened in the first valve body, and the small piston chamber (4) is opened in the second valve body. An annular chamber (41) is opened on the end surface of the second valve body at the end away from the small piston chamber (4).

5. The pneumatic conveying pipeline auxiliary blowing valve capable of delayed closing according to claim 1, Characterized in that: A delay indicator mechanism is installed inside the valve body (1). The delay indicator mechanism includes an illumination chamber (46) arranged on one side of the power piston chamber (28). An LED lamp bead (47) is installed inside the illumination chamber (46). Corresponding to the position of the LED lamp bead (47), a plurality of transparent glass columns (48) are further arranged on the other side of the power piston chamber (28). Each transparent glass column (48) extends out of the surface of the valve body (1). The LED lamp bead (47) can illuminate the transparent glass columns (48). During the moving and resetting process of the moving piston (29), each transparent glass column (48) can be gradually blocked.

6. A pneumatic conveying pipeline auxiliary blowing valve capable of delaying closing according to claim 1, characterized in that: A first pressure gauge (49) is installed on the air supply channel (32). A supplementary air channel (50) is further installed on the air supply channel (32). A second one-way valve (51) and a supplementary air switch (52) are arranged on the supplementary air channel (50). The second one-way valve (51) allows the gas outside the valve body (1) to enter the supplementary air channel (50).

7. A pneumatic conveying pipeline auxiliary blowing valve capable of delaying closing according to claim 1, characterized in that: A second pressure gauge (54) is installed on the bypass air path (53). A second flow regulating screw (55) is installed inside the valve body (1). The second flow regulating screw (55) can rotate into the bypass air path (53). The second flow regulating screw (55) can control the gas flow rate entering the communication chamber (5) from the bypass air path (53).

8. A pneumatic conveying pipeline auxiliary blowing valve capable of delaying closing according to claim 1, characterized in that: A first flow regulating screw (34) is installed at the connection position of the slow air return channel (33) and the air supply channel (32). Rotating the first flow regulating screw (34) can adjust the speed of the gas in the power piston chamber (28) flowing back into the pneumatic conveying mechanism.

9. A pneumatic conveying pipeline auxiliary blowing valve capable of delaying closing according to claim 1, characterized in that: The elastic force of the second compression spring (15) is greater than the elastic force of the first compression spring (12).

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