Self-standing regulating valve of pulverized coal bunker discharge system and regulating method thereof

Abstract

The invention discloses a pulverized coal bunker discharge system self-standing regulating valve and a regulating method thereof, and relates to the technical field of vertical regulating valves, the pulverized coal bunker discharge system self-standing regulating valve comprises a main pipe body, an end plug, an air inlet pipe and a plunger, the main pipe body is provided with a through main channel and a side channel communicated with the main channel, and regulating rings are rotationally arranged at the two ends of the main channel in a sealed mode; exhaust pipes are mounted at the outer ends of the side channels; the end plug is fixedly connected with the upper adjusting ring, so that the top end of the main channel is closed; the air inlet pipe is fixedly connected with the lower adjusting ring; the plunger is movably arranged in the main channel, and a constant pressure stabilizing structure used for controlling the plunger to switch pressure between the upward movement limiting position and the downward movement limiting position is arranged between the plunger and the adjusting ring. By arranging the constant pressure stabilizing structure, a reasonable air pressure buffering range is formed between an overpressure relief value and a low pressure closing value, frequent action of the regulating valve caused by tiny air pressure fluctuation is effectively avoided, and the service life of the regulating valve is prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of vertical regulating valves, and in particular to a self-standing regulating valve of a pulverized coal bin discharge system and a regulating method thereof. Background Art

[0002] With the continuous development and improvement of coal chemical technology, coal chemical industry has become more and more clean, efficient, environmentally friendly and green. Pulverized coal gasification process is an important part of coal chemical industry. Among them, coal powder transportation is an important part of pulverized coal gasification. Through coal powder transportation, coal powder is transported from the normal pressure coal powder bin to the high pressure coal powder feeding tank. During the coal powder transportation process, the coal powder bin will be overpressured due to the high material level of the coal powder bin during the operation. In order to prevent safety accidents from occurring in the coal powder bin during overpressure, a constant pressure relief device or bursting disc is designed on the top of the coal powder bin.

[0003] Existing constant pressure relief valves usually need to set a threshold value. When the pressure in the system reaches the set value, it opens to release the pressure. When the pressure is lower than the set value, it closes to maintain the pressure in the system. Since the valve does not have a buffer range for discharge, it will immediately release the pressure when the pressure reaches the set value. Therefore, when the pressure in the system is close to the set value, slight pressure fluctuations will often cause the valve to open and close frequently, which may cause unstable system operation and affect the normal operation and accuracy of the equipment. In addition, frequent pressure fluctuations may cause impact on valve components, which may cause equipment damage or shorten its life in the long run. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that the pressure relief valve in the prior art does not have a pressure buffer range, which easily causes unstable system operation, and proposes a self-supporting regulating valve for a pulverized coal bin discharge system and a regulating method thereof.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A self-supporting regulating valve for a pulverized coal bunker discharge system, comprising: The main body has a main channel and a side channel connected to the main channel, both ends of the main channel are sealed and rotatably provided with adjustment rings, and the outer end of the side channel is equipped with an exhaust pipe; An end plug is fixedly connected to the adjusting ring located above so as to close the top of the main channel; An air intake pipe is fixedly connected to the adjusting ring located below, and a flexible pipe is provided at the bottom end of the air intake pipe; The plunger is movably arranged in the main channel and has an upper limit position and a lower limit position. A constant pressure stabilizing structure for controlling the pressure switching of the plunger between the upper limit position and the lower limit position is arranged between the plunger and the adjusting ring. When the plunger is at the upper limit position, the intake pipe and the exhaust pipe are connected. When the plunger is at the lower limit position, the intake pipe is blocked.

[0006] Preferably, mounting ring grooves are provided at both ends of the main pipe body, and a sealing convex ring matched with the mounting ring groove is provided on the outer peripheral surface of the adjustment ring, and the sealing convex ring is sealingly rotatably connected with the mounting ring groove.

[0007] Preferably, the plunger includes a mounting disk, a sealing disk and a turbofan, the sealing disk is rotatably arranged on the bottom surface of the mounting disk, the turbofan is fixedly mounted on the bottom surface of the sealing disk, the mounting disk is slidably connected to the main channel, and the sealing disk is adapted to the intake pipe port.

[0008] Preferably, the outer edge of the bottom of the sealing disk is provided with an outer chamfer, and the inner edge of the air inlet pipe port is provided with an inner chamfer.

[0009] Preferably, the inner wall of the main channel is provided with a limiting strip arranged along the axial direction, and the outer edge of the mounting plate is provided with a limiting opening matched with the limiting strip.

[0010] Preferably, the constant pressure stabilizing structure includes a plurality of iron pillars penetrating the mounting plate, a plurality of weak magnets are arranged on the bottom surface of the upper adjustment ring, and a plurality of strong magnets are arranged on the top surface of the lower adjustment ring. When the mounting plate is located at the upper limit position, the weak magnets are adsorbed and fitted to the iron pillars, and when the mounting plate is located at the lower limit position, the strong magnets are adsorbed and fitted to the iron pillars.

[0011] Preferably, the plurality of iron pillars, weak magnets and strong magnets are equidistantly distributed within a sector-shaped range, and the distribution intervals of the iron pillars, weak magnets and strong magnets are the same.

[0012] Preferably, the suction force generated by all the weak magnets when adsorbed to the iron column is smaller than the gravity of the plunger.

[0013] Preferably, the inner wall of the mounting ring groove is provided with a plurality of notches at equal intervals, the outer wall of the sealing convex ring is provided with a plurality of damping springs, the damping springs have protrusions adapted to the notches, and the spacing of the notches is consistent with the installation spacing of the iron column.

[0014] A method for adjusting a self-supporting regulating valve of a pulverized coal silo discharge system comprises the following steps: Pipeline installation: connect the flexible pipe on the air inlet pipe to the pressure relief pipe of the pulverized coal bin, and the exhaust pipe to the air inlet end of the bag filter. In the initial state, the plunger is at the lower limit position under the action of its own weight, and the strong magnet generates suction on the iron column. Overpressure release: When there is overpressure in the coal powder bin, the excessive pressure will push the plunger upward. The upward movement of the plunger needs to overcome the suction force of the strong magnet on the iron column and the plunger's own weight. At the moment of overcoming the strong magnet, the suction force of the strong magnet is instantly reduced, causing the plunger to produce explosive displacement and reach the upper limit position, so that the iron column and the weak magnet are adsorbed. Under the action of air pressure, the plunger remains in the upper limit position, the air inlet pipe is fully opened, and the released coal powder enters the bag dust collector through the exhaust pipe, while completing the pressure relief of the coal powder bin; Low-pressure closing: when the pressure in the coal powder bin decreases until the upward thrust generated by the air pressure and the adsorption force of the weak magnet are insufficient to support the weight of the plunger, the plunger moves downward and away from the weak magnet, losing the adsorption force of the weak magnet. The plunger immediately enters the range of action of the strong magnet and is adsorbed by the strong magnet, closing the air intake pipe. Threshold adjustment: By turning the adjustment ring, you can control the number of strong magnets and weak magnets acting on the iron column respectively, so as to control the size of the adsorption force, and then realize the threshold adjustment of overpressure release and low-pressure shutdown.

[0015] Compared with the prior art, the present invention has the following advantages: 1. The present invention sets a constant pressure stabilizing structure, utilizes strong magnets and weak magnets to adsorb and cooperate with the iron column, and combines the force change of the plunger when the air pressure changes. When the threshold is set, it has an overpressure release value and a low-pressure closing value. The air pressure is released when the overpressure threshold is reached, and the pressure in the system needs to drop to the low-pressure closing value before it will be closed. Therefore, a reasonable air pressure buffer range is formed between the overpressure release value and the low-pressure closing value, which effectively avoids frequent operation of the regulating valve due to small air pressure fluctuations, prolongs the service life of the regulating valve, thereby improving the operating stability of the system and reducing the damage to system components and regulating valve parts caused by pressure fluctuations.

[0016] 2. The present invention can increase or decrease the number of strong magnets and weak magnets involved in the adsorption effect by rotating the adjustment ring clockwise or counterclockwise, thereby changing the size of the magnetic force and realizing the adjustment of the pressure threshold, which is directly related to the setting of the air pressure buffer range, so that the system can flexibly adjust the buffer zone between its overpressure relief value and the low-pressure closing value according to different working conditions and needs. Through reasonable buffer range setting, the impact and wear on the regulating valve and its components caused by frequent opening and closing or drastic air pressure changes can be reduced, thereby extending the service life of the equipment. In the face of diverse air pressure conditions, the present invention enables the system to respond and adapt quickly to ensure that it can maintain a stable operating state under different working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a self-supporting regulating valve for a pulverized coal silo discharge system proposed by the present invention; Figure 2A schematic structural diagram of an overpressure relief state of a self-supporting regulating valve of a pulverized coal silo relief system proposed by the present invention; Figure 3 This is a structural schematic diagram of a self-supporting regulating valve of a pulverized coal silo discharge system proposed by the present invention in a low-pressure closed state; Figure 4 This is a structural schematic diagram of a main pipe body in a self-supporting regulating valve of a pulverized coal silo discharge system proposed by the present invention; Figure 5 This is a structural schematic diagram of an adjusting ring in a self-supporting regulating valve of a pulverized coal silo discharge system proposed by the present invention; Figure 6 This is a schematic diagram of the structure of a plunger in a self-supporting regulating valve of a pulverized coal silo discharge system proposed by the present invention; Figure 7 The present invention is a schematic cross-sectional structural diagram of a plunger in a self-supporting regulating valve of a pulverized coal silo discharge system.

[0018] In the figure: 1. main body; 11. main channel; 12. side channel; 13. adjustment ring; 131. sealing convex ring; 132. weak magnet; 133. strong magnet; 134. damping spring; 135. protrusion; 14. exhaust pipe; 15. mounting ring groove; 151. notch; 2. end plug; 3. intake pipe; 31. flexible pipe; 4. plunger; 41. mounting plate; 411. iron column; 42. sealing plate; 43. turbofan. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] Reference Figure 1-4 A self-supporting regulating valve for a pulverized coal bunker discharge system comprises a main body 1, an end plug 2, an air inlet pipe 3 and a plunger 4.

[0021] The main body 1 has a through main channel 11 and a side channel 12 connected to the main channel 11. The main channel 11 and the side channel 12 together form a T-shaped channel. Adjustment rings 13 are sealed and rotatably provided at both ends of the main channel 11. An exhaust pipe 14 is installed at the outer end of the side channel 12. The exhaust pipe 14 is connected to a bag dust collector to prevent the coal powder from directly leaking into the external environment when the coal powder bin is depressurized. While polluting the environment, there is also a hidden danger of high-temperature coal powder catching fire and causing a safety accident.

[0022] Reference Figure 1-5Both ends of the main pipe body 1 are provided with mounting ring grooves 15, and the outer peripheral surface of the adjusting ring 13 is provided with a sealing convex ring 131 adapted to the mounting ring groove 15. The sealing convex ring 131 is sealingly rotatably connected with the mounting ring groove 15. The mounting ring groove 15 cooperates with the sealing convex ring 131 to improve the sealing between the adjusting ring 13 and the main pipe body 1.

[0023] The end plug 2 is fixedly connected to the adjusting ring 13 located above, so that the top of the main channel 11 is closed. The end plug 2 can control the rotation of the adjusting ring 13 located above, and the end plug 2 and the adjusting ring 13 are threadedly fastened and can be disassembled, which is convenient for cleaning and maintenance of the inside of the main body 1.

[0024] The air intake pipe 3 is fixedly connected to the adjusting ring 13 located below, and the air intake pipe 3 can control the rotation of the adjusting ring 13 located below, and the air intake pipe 3 and the adjusting ring 13 are threadedly fastened and can be disassembled. A flexible pipe 31 is provided at the bottom end of the air intake pipe 3, and the flexible pipe 31 is connected to the pressure relief pipe of the pulverized coal bin. Under the action of the flexible pipe 31, the air intake pipe 3 is rotated to adjust the adjusting ring 13 without affecting the connection state of the pressure relief pipe.

[0025] The plunger 4 is movably arranged in the main channel 11, and has an upper limit position and a lower limit position. A constant pressure stabilizing structure for controlling the plunger 4 to switch the pressure between the upper limit position and the lower limit position is arranged between the plunger 4 and the adjusting ring 13. When the plunger 4 is in the upper limit position, the intake pipe 3 and the exhaust pipe 14 are connected, and the pressure can be relieved. When the plunger 4 is in the lower limit position, the intake pipe 3 is blocked to keep the pulverized coal bin closed. By setting a constant pressure stabilizing structure and combining the force change of the plunger 4 when the air pressure changes, when the threshold is set, there is an overpressure relief value and a low-pressure closing value. The air pressure is discharged when the overpressure threshold is reached, and it will not be closed until the pressure in the system drops to the low-pressure closing value. Therefore, a reasonable air pressure buffer range is formed between the overpressure relief value and the low-pressure closing value, which effectively avoids the frequent operation of the regulating valve caused by small air pressure fluctuations, prolongs the service life of the regulating valve, thereby improving the operating stability of the system and reducing the damage to system components and regulating valve parts caused by pressure fluctuations.

[0026] Reference Figure 6-7The plunger 4 includes a mounting plate 41, a sealing plate 42 and a turbofan 43. The sealing plate 42 is rotatably arranged on the bottom surface of the mounting plate 41, and the turbofan 43 is fixedly mounted on the bottom surface of the sealing plate 42. The turbofan 43 is located at one end of the sealing plate 42 close to the intake pipe 3. When overpressure is released, the plunger 4 is located at the upper limit position, and the turbofan 43 corresponds to the exhaust pipe 14. The released airflow acts on the turbofan 43 to rotate the turbofan 43. The rotation of the turbofan 43 can ensure that the airflow is evenly distributed during the release process, avoiding pressure fluctuations and airflow turbulence caused by excessively fast or slow local airflow speeds, reducing noise, and the inertia of the sealing plate 42 allows the turbofan 43 to continue rotating for a period of time after the air pressure is reduced, which plays a buffering role, helps the system to transition smoothly, and reduces vibration and impact caused by sudden pressure changes. After the pressure relief is completed, the plunger 4 reaches the lower limit position, the turbofan 43 enters the intake pipe 3 and hides, and the sealing plate 42 closes the port of the intake pipe 3 to achieve airtight sealing.

[0027] The mounting disk 41 is slidably connected to the main channel 11, and the inner wall of the main channel 11 is provided with a limit strip arranged axially, and the outer edge of the mounting disk 41 is provided with a limit opening matched with the limit strip to prevent the mounting disk 41 from deflecting when the sealing disk 42 rotates. The sealing disk 42 is matched with the port of the intake pipe 3, and the outer edge of the bottom of the sealing disk 42 is provided with an outer chamfer, and the inner edge of the port of the intake pipe 3 is provided with an inner chamfer. By matching the inner chamfer and the outer chamfer, the matching effect is improved, the sealing area is increased, and the air tightness is ensured.

[0028] Reference Figure 1-3The constant pressure stabilizing structure includes a plurality of iron pillars 411 penetratingly arranged on the mounting plate 41, a plurality of weak magnets 132 are arranged on the bottom surface of the upper adjusting ring 13, and a plurality of strong magnets 133 are arranged on the top surface of the lower adjusting ring 13. When the mounting plate 41 is located at the upper limit position, the weak magnets 132 are adsorbed and fitted with the iron pillars 411, and when the mounting plate 41 is located at the lower limit position, the strong magnets 133 are adsorbed and fitted with the iron pillars 411. Since the magnetic field lines are more concentrated around the magnet, when the magnet adsorbs ferromagnetic materials, the magnetic force will increase rapidly in the close state, showing a strong attraction, and the change of the attraction is manifested as a nonlinear change. This nonlinear magnetic characteristic makes the magnetic force suddenly released once a certain critical point is reached when the magnet is separated, resulting in an explosive change in force. Therefore, when the pulverized coal bin is over-pressured, the excessive pressure will push the plunger 4 upward, and the upward movement of the plunger 4 needs to overcome the The suction force of the strong magnet 133 on the iron column 411 and the dead weight of the plunger 4, at the moment of overcoming the strong magnet 133, the suction force of the strong magnet 133 is instantly reduced, causing the plunger 4 to produce explosive displacement and reach the upper limit position, so that the iron column 411 and the weak magnet 132 are adsorbed, and under the action of air pressure, the plunger 4 is maintained at the upper limit position, the intake pipe 3 is fully opened, and the pressure in the pulverized coal bin is reduced until the upward thrust generated by the air pressure and the adsorption force of the weak magnet 132 are insufficient to support the weight of the plunger 4. The plunger 4 moves downward and away from the weak magnet 132, losing the suction effect of the weak magnet 132, and the plunger 4 immediately enters the action range of the strong magnet 133 and is adsorbed by the strong magnet 133, so that the intake pipe 3 is closed. The opening and closing process of the above regulating valve forms an air pressure buffer range, so the regulating valve will not be frequently operated due to small air pressure fluctuations, thereby extending the service life of the regulating valve.

[0029] Reference Figure 1-7 , multiple iron pillars 411, weak magnets 132 and strong magnets 133 are evenly distributed within the fan-shaped range, and the distribution intervals of the iron pillars 411, weak magnets 132 and strong magnets 133 are the same. Therefore, by rotating the adjustment ring 13, the number of strong magnets 133 and weak magnets 132 participating in the adsorption effect can be controlled, and within the fan-shaped range, it is ensured that at least one strong magnet 133 and weak magnet 132 can participate in the effect, thereby achieving the purpose of changing the magnitude of the magnetic force.

[0030] The suction force generated when all the weak magnets 132 are adsorbed to the iron column 411 is smaller than the gravity of the plunger 4, ensuring that when the weak magnets 132 are in the strongest adsorption state, that is, when the low-pressure threshold is the largest, the plunger 4 can escape from the upper limit position by its own gravity, thereby preventing the plunger 4 from always staying in the upper limit position after the pressure relief is completed, causing the regulating valve to be in a normally open state.

[0031] Reference Figure 4-5The inner wall of the mounting ring groove 15 is equidistantly provided with a plurality of notches 151, and the outer wall of the sealing convex ring 131 is provided with a plurality of damping spring sheets 134, and the damping spring sheet 134 has a protrusion 135 adapted to the notch 151. Under normal conditions, the protrusion 135 is inserted into the notch 151. When the adjusting ring 13 is rotated, the notch 151 presses against the protrusion 135 to deform the damping spring sheet 134 until it enters the next notch 151, thereby forming a damping feel effect, which can effectively prevent the adjusting ring 13 from being rotated quickly and randomly. The damping feel gives the user an intuitive feedback, letting the user know that the adjusting ring 13 is being effectively rotated, and each step of rotation is accurate. The interval of the notches 151 is consistent with the installation interval of the iron column 411, ensuring that after each rotation of the adjusting ring 13, the strong magnet 133 and the weak magnet 132 remain in a corresponding state with the iron column 411.

[0032] A method for adjusting a self-supporting regulating valve of a pulverized coal silo discharge system comprises the following steps: Pipeline installation, connect the flexible pipe 31 on the air inlet pipe 3 to the pressure relief pipe of the coal powder bin, and the exhaust pipe 14 to the air inlet end of the bag filter. In the initial state, the plunger 4 is located at the lower limit position under the action of its own weight, and the strong magnet 133 generates suction on the iron column 411; Overpressure discharge: When there is overpressure in the coal powder bin, the excessive pressure will push the plunger 4 upward. The upward movement of the plunger 4 needs to overcome the suction force of the strong magnet 133 on the iron column 411 and the deadweight of the plunger 4. At the moment of overcoming the strong magnet 133, the suction force of the strong magnet 133 is instantly reduced, causing the plunger 4 to produce explosive displacement and reach the upper limit position, so that the iron column 411 and the weak magnet 132 are adsorbed, and under the action of air pressure, the plunger 4 is kept in the upper limit position, the air inlet pipe 3 is fully opened, and the discharged coal powder enters the bag dust collector through the exhaust pipe 14, while completing the pressure relief of the coal powder bin; Low-pressure closing: when the pressure in the coal powder bin decreases until the upward thrust generated by the air pressure and the adsorption force of the weak magnet 132 are insufficient to support the weight of the plunger 4, the plunger 4 moves downward and away from the weak magnet 132, and loses the adsorption force of the weak magnet 132. The plunger 4 immediately enters the action range of the strong magnet 133 and is adsorbed by the strong magnet 133, so that the air inlet pipe 3 is closed; Threshold adjustment: By rotating the adjustment ring 13, the number of strong magnets 133 and weak magnets 132 corresponding to the iron column 411 can be controlled to control the size of the adsorption force, thereby achieving threshold adjustment for overpressure relief and low-pressure shutdown.

Claims

1. A self-supporting regulating valve for a pulverized coal bunker discharge system, characterized in that: include: A main pipe body (1) having a through main channel (11) and a side channel (12) connected to the main channel (11), wherein both ends of the main channel (11) are provided with an adjustment ring (13) for sealing and rotation, and an exhaust pipe (14) is installed at the outer end of the side channel (12); An end plug (2) is fixedly connected to an adjustment ring (13) located above, so that the top end of the main channel (11) is closed; An air intake pipe (3) is fixedly connected to the adjustment ring (13) located below, and a flexible pipe (31) is provided at the bottom end of the air intake pipe (3); A plunger (4) is movably arranged in the main channel (11) and has an upper limit position and a lower limit position. A constant pressure stabilizing structure for controlling the pressure of the plunger (4) to switch between the upper limit position and the lower limit position is arranged between the plunger (4) and the adjusting ring (13). When the plunger (4) is at the upper limit position, the air intake pipe (3) and the exhaust pipe (14) are connected. When the plunger (4) is at the lower limit position, the air intake pipe (3) is blocked.

2. A self-supporting regulating valve for a pulverized coal silo discharge system according to claim 1, characterized in that: The main pipe body (1) is provided with mounting annular grooves (15) at both ends, and the outer peripheral surface of the adjustment ring (13) is provided with a sealing convex ring (131) adapted to the mounting annular groove (15), and the sealing convex ring (131) is sealingly rotatably connected to the mounting annular groove (15).

3. A self-supporting regulating valve for a pulverized coal silo discharge system according to claim 1, characterized in that: The plunger (4) comprises a mounting plate (41), a sealing plate (42) and a turbine fan (43); the sealing plate (42) is rotatably mounted on the bottom surface of the mounting plate (41); the turbine fan (43) is fixedly mounted on the bottom surface of the sealing plate (42); the mounting plate (41) is slidably connected to the main channel (11); and the sealing plate (42) is adapted to a port of an intake pipe (3).

4. A self-supporting regulating valve for a pulverized coal silo discharge system according to claim 3, characterized in that: The outer edge of the bottom of the sealing disk (42) is provided with an outer chamfer, and the inner edge of the port of the air inlet pipe (3) is provided with an inner chamfer.

5. The self-supporting regulating valve of the pulverized coal silo discharge system according to claim 3 is characterized in that: The inner wall of the main channel (11) is provided with a limiting strip arranged along the axial direction, and the outer edge of the mounting plate (41) is provided with a limiting opening matched with the limiting strip.

6. A self-supporting regulating valve for a pulverized coal bunker discharge system according to claim 2, characterized in that: The constant pressure stabilizing structure comprises a plurality of iron pillars (411) penetrating the mounting plate (41); a plurality of weak magnets (132) are arranged on the bottom surface of the upper adjustment ring (13); and a plurality of strong magnets (133) are arranged on the top surface of the lower adjustment ring (13); when the mounting plate (41) is located at an upper limit position, the weak magnets (132) and the iron pillars (411) are adsorbed and fitted; and when the mounting plate (41) is located at a lower limit position, the strong magnets (133) and the iron pillars (411) are adsorbed and fitted.

7. A self-supporting regulating valve for a pulverized coal bunker discharge system according to claim 6, characterized in that: The plurality of iron pillars (411), weak magnets (132) and strong magnets (133) are all equally spaced within a sector-shaped range, and the distribution intervals of the iron pillars (411), weak magnets (132) and strong magnets (133) are the same.

8. The self-supporting regulating valve of the pulverized coal bunker discharge system according to claim 6 is characterized in that: The suction force generated by all the weak magnets (132) when adsorbed to the iron column (411) is smaller than the gravity of the plunger (4).

9. A self-supporting regulating valve for a pulverized coal bunker discharge system according to claim 6, characterized in that: The inner wall of the mounting ring groove (15) is provided with a plurality of notches (151) at equal intervals, the outer wall of the sealing convex ring (131) is provided with a plurality of damping springs (134), the damping springs (134) having protrusions (135) adapted to the notches (151), and the spacing of the notches (151) is consistent with the installation spacing of the iron column (411).

10. A method for regulating a self-supporting regulating valve of a pulverized coal silo discharge system, using the self-supporting regulating valve as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Pipeline installation, connecting the flexible pipe (31) on the air inlet pipe (3) to the pressure relief pipe of the coal powder bin, and connecting the exhaust pipe (14) to the air inlet end of the bag filter. In the initial state, the plunger (4) is located at the lower limit position under the action of its own weight, and the strong magnet (133) generates suction force on the iron column (411); Overpressure release: when the pulverized coal bin is overpressured, the excessive pressure will push the plunger (4) upward. The upward movement of the plunger (4) needs to overcome the suction force of the strong magnet (133) on the iron column (411) and the deadweight of the plunger (4). At the moment of overcoming the strong magnet (133), the suction force of the strong magnet (133) is instantly reduced, causing the plunger (4) to produce explosive displacement and reach the upper limit position, so that the iron column (411) and the weak magnet (132) are adsorbed, and under the action of air pressure, the plunger (4) is maintained at the upper limit position, the air inlet pipe (3) is fully opened, and the discharged pulverized coal enters the bag filter through the exhaust pipe (14) and the pressure relief of the pulverized coal bin is completed at the same time; Low-pressure closing: when the pressure in the coal powder bin decreases until the upward thrust generated by the air pressure and the adsorption force of the weak magnet (132) are insufficient to support the weight of the plunger (4), the plunger (4) moves downward and away from the weak magnet (132), losing the adsorption force of the weak magnet (132), and the plunger (4) immediately enters the action range of the strong magnet (133) and is adsorbed by the strong magnet (133), so that the air inlet pipe (3) is closed; Threshold value adjustment: by rotating the adjustment ring (13), the number of corresponding actions of the strong magnet (133) and the weak magnet (132) on the iron column (411) can be controlled, thereby controlling the magnitude of the adsorption force and further adjusting the threshold value of overpressure release and low-pressure shutdown.

Images