Automatic blowing and blocking valve for ash pipeline

Abstract

The automatic blowing and blocking valve comprises a valve body and an end cover, an air inlet cavity and an air outlet cavity which are communicated with each other are formed in the valve body, a pushing cavity is formed between the end cover and the valve body, a first air outlet communicated with the air outlet cavity is formed in the valve body, and an anti-blocking assembly is arranged on the lower portion of the first air outlet; the anti-blocking assembly comprises a shell, and an air outlet II and an anti-blocking valve assembly are arranged in the shell; the anti-blocking valve assembly is arranged between the air outlet I and the air outlet II; the anti-blocking valve assembly comprises an elastic piece, a base plate piece, an anti-blocking valve sealing ring and a connecting bolt, a groove is formed in the inner ring of the anti-blocking valve sealing ring, the elastic piece is arranged on the lower portion of the base plate piece and connected with the base plate piece through the connecting bolt, and the base plate piece is arranged in the groove of the anti-blocking valve sealing ring in a sleeved mode. According to the scheme, an anti-blocking isolation structure of a tower spring and a glass ball in the prior art is replaced by the designed anti-blocking assembly, it is effectively guaranteed that the problem that the tower spring is stuck and fails due to the fact that ash is accumulated on the tower spring is solved, and it is guaranteed that the blowing assisting valve can work stably.

Description

Technical Field

[0001] The invention relates to the technical field of electric ash conveying, in particular to an automatic blowing and blocking valve for an ash pipeline. Background Art

[0002] The pneumatic ash conveying system of thermal power plants is generally based on the pneumatic conveying principle of gas-solid two-phase flow, and conveys high-concentration materials through the static and dynamic pressure of compressed air. This ash conveying method has problems such as pipe blockage, wear and high gas consumption. In particular, the pipe blockage problem, if not handled in time, will cause the ash in the ash hopper to accumulate. When the ash fluidity deteriorates, the temperature will further drop, exacerbating the accumulation of ash.

[0003] The Chinese invention with application number: CN202220391326.1 discloses a pilot-type ash conveying and air supplying device, including a valve body with a hollow structure, a pilot valve is arranged on the right side of the valve body, and a pressure gauge is arranged on the left side; the pilot valve includes a pilot valve cover with a hollow structure connected to the right end face of the valve body, and a spring pressure seat is arranged on the right end threaded sleeve of the pilot valve cover; a compression spring is arranged at one end of the spring pressure seat located inside the pilot valve cover, and a valve core is arranged at the other end of the compression spring; one end of the valve core is slidably arranged inside the pilot valve cover, and the other end is slidably arranged inside the valve body; an air outlet seat is arranged at the lower end of the valve body, and the air outlet seat includes an air outlet end seat with a hollow structure, and a tower spring is clamped in the air outlet end seat; one end of the tower spring abuts on the clamping groove in the air outlet end seat, and the other end abuts on the glass ball; the glass ball abuts on the end face of the valve body.

[0004] However, in the above scheme, the valve body cavity is isolated from the ash conveying pipeline by using the tower yellow and the glass ball. However, when the ash conveying pipeline is working or blocked, the ash in the ash conveying pipeline will enter the tower spring and accumulate. The ash will continue to accumulate in the tower spring, eventually jamming the entire tower spring, causing the tower spring to lose its ability to expand and contract. Finally, when the ash conveying pipeline is blocked, the tower spring cannot be compressed, causing the entire valve body to lose its ability to assist blowing. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is that: in the prior art, the cavity inside the valve body is isolated from the ash conveying pipeline by using tower yellow and glass balls. However, when the ash conveying pipeline is working or blocked, the ash in the ash conveying pipeline will enter the position of the tower spring and accumulate. The ash will continue to accumulate in the tower spring, eventually jamming the entire tower spring, causing the tower spring to lose its ability to expand and contract. Finally, when the ash conveying pipeline is blocked, the tower spring cannot be compressed, causing the entire valve body to lose its ability to assist blowing.

[0007] (II) Technical solution

[0008] To solve the above problems, the present invention provides the following technical solutions:

[0009] An automatic blow-off valve for gray pipelines, comprising a valve body and an end cover, wherein the valve body and the end cover are fixedly connected, the valve body is provided with an air inlet cavity and an air outlet cavity which are connected to each other, a push cavity is provided between the end cover and the valve body, the valve body is further provided with an air inlet hole 1, one end of the air inlet hole 1 is connected to the air inlet cavity, and the other end is connected to the push cavity, and the air outlet cavity is connected to the middle part of the air inlet hole 1;

[0010] The valve body is also provided with a piston chamber 1, in which a main piston that can move forward and backward is provided, and the push chamber is provided between the main piston and the end cover;

[0011] The valve body is provided with an air outlet 1 connected to the air outlet cavity, and an anti-blocking component is provided at the lower part of the air outlet 1;

[0012] The anti-blocking assembly comprises a shell fixedly connected to the valve body, and a second air outlet and an anti-blocking valve assembly are arranged in the shell;

[0013] The anti-blocking valve assembly is arranged between the first gas outlet and the second gas outlet;

[0014] The anti-blocking valve assembly comprises an elastic sheet, a chassis sheet, an anti-blocking valve sealing ring with a groove on the inner ring, and connecting bolts. The elastic sheet is arranged at the lower part of the chassis sheet and connected to the chassis sheet through the connecting bolts. The chassis sheet is sleeved in the groove of the anti-blocking valve sealing ring.

[0015] The chassis sheet is provided with a plurality of soot blowing vents, and the elastic sheet covers the plurality of soot blowing vents on the chassis sheet;

[0016] The elastic sheet is made of soft material, and the chassis sheet is made of metal;

[0017] A connecting rod is provided at one end of the main piston close to the air outlet cavity, and the connecting rod can move forward and backward together with the main piston;

[0018] A connecting sleeve is provided at one end of the connecting rod close to the air inlet chamber, and the connecting sleeve is sleeved at one end of the connecting rod, and the connecting sleeve can move forward and backward together with the main piston;

[0019] A secondary piston is provided at one end of the connecting sleeve away from the connecting rod, and the end of the connecting sleeve away from the connecting rod abuts against an end surface of the secondary piston close to the connecting rod sleeve;

[0020] An adjusting nut is also provided at one end of the air inlet chamber, and the adjusting nut is connected to the valve body by a threaded connection. A spring is provided between the adjusting nut and the auxiliary piston, and two ends of the spring are respectively pressed against the adjusting nut and the auxiliary piston.

[0021] Furthermore, a vent 1 is provided on the air outlet 1, and the vent 1 penetrates the valve body in one direction. A vent 2 is provided on the end cover, and the vent 2 extends to the push chamber.

[0022] Furthermore, a sealing gasket is provided between the end cover and the main piston. The sealing gasket is arranged between the push chamber and the main piston, and a side of the sealing gasket close to the main piston is in contact with a side of the main piston close to the end cover.

[0023] Furthermore, the valve body is provided with an adjusting hole, the adjusting hole is connected with the air inlet hole, and a flow regulating valve is arranged in the adjusting hole.

[0024] Furthermore, a sealing ring 1 is arranged at the middle of the connecting rod, and a sealing ring 2 is arranged on the main piston.

[0025] Furthermore, the end cover is provided with an air inlet hole 2, one end of the air inlet hole 2 is connected to the push chamber, and one end of the air inlet hole 1 close to the end cover passes through the sealing gasket and is connected to the air inlet hole 2.

[0026] Furthermore, one end of the adjusting nut away from the spring is connected to an external air supply device, and the second air outlet is connected to an external ash conveying pipe through a pipe fitting.

[0027] (III) Beneficial effects

[0028] The beneficial effect of the present invention is that the anti-blocking isolation structure of the tower spring and the glass ball in the prior art is replaced by the designed anti-blocking component, which effectively solves the problem of the tower spring being stuck and failing due to the accumulation of dust on the tower spring, and ensures that the blowing-assisting valve can work stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a cross-sectional view of the present invention;

[0030] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0031] Figure 3 It is a structural schematic diagram of the anti-blocking component of the present invention;

[0032] Figure 4 It is a structural schematic diagram of the anti-blocking valve assembly of the present invention;

[0033] Figure 5 It is a schematic diagram of the connection between the cushion block and the anti-blocking valve assembly of the present invention;

[0034] Figure 6 It is a schematic diagram of the connection between multiple blowing-assisting valves, and the connection between the blowing-assisting valves, the air source pipe, and the ash conveying pipe of the present invention.

[0035] Markings in the figure: 1-valve body, 2-end cover, 3-pushing chamber, 4-inlet hole 1, 5-inlet chamber, 6-outlet chamber, 7-piston chamber 1, 8-main piston, 9-outlet port 1, 10-anti-blocking assembly, 11-connecting rod, 12-connecting sleeve, 13-auxiliary piston, 14-adjusting nut, 15-spring, 16-vent 1, 17-vent 2, 18-sealing pad, 19-adjusting hole, 20-flow regulating valve, 21-sealing ring 1, 22-sealing ring 2, 23-inlet hole 2, 24-pad, 25-gas source pipe, 26-ash delivery pipe, 28-connecting air pipe 1, 29-connecting air pipe 2.

[0036] 1001-housing, 1002-gas outlet 2, 1003-anti-blocking valve assembly;

[0037] 1003a-elastic sheet, 1003b-chassis sheet, 1003c-connecting bolts, 1003d-soot blowing vent. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] See also Figure 1-Figure 4, an automatic blowing and blocking valve for gray pipelines shown in the figure comprises a valve body 1 and an end cover 2, the valve body 1 and the end cover 2 are fixedly connected, the valve body 1 is provided with an air inlet cavity 5 and an air outlet cavity 6 which are connected to each other, the air inlet cavity 5 is connected to an external air source pipe 25, a push cavity 3 is provided between the end cover 2 and the valve body 1, and the valve body 1 is also provided with an air inlet hole 4, one end of the air inlet hole 4 is connected to the air inlet cavity 5, and the other end is connected to the push cavity 3, and the air outlet cavity 6 is connected to the middle part of the air inlet hole 4.

[0041] A piston chamber 7 is also provided on the valve body 1, in which a main piston 8 which can move forward and backward is provided, and a push chamber 3 is provided between the main piston 8 and the end cover 2; when the pressure in the push chamber 3 reaches a level that can push the main piston 8, the main piston 8 is pushed in the piston chamber 7 to move toward the air inlet chamber 5.

[0042] The valve body 1 is provided with an air outlet 9 connected to the air outlet cavity 6, and an anti-blocking component 10 is arranged at the lower part of the air outlet 9. The anti-blocking component 10 is mainly used to prevent dust in the ash conveying pipeline from entering the interior of the valve body 1 and causing damage to the ash conveying valve, resulting in it losing its blowing ability.

[0043] The anti-blocking assembly 10 comprises a housing 1001 fixedly connected to the valve body 1 , a second air outlet 1002 and an anti-blocking valve assembly 1003 are arranged in the housing 1001 , and the second air outlet 1002 is connected to the ash conveying pipe.

[0044] The anti-blocking valve assembly 1003 is arranged between the air outlet 1 9 and the air outlet 2 1002. The anti-blocking valve assembly 1003 is arranged between the air outlet 1 9 and the air outlet 2 1002, which can effectively prevent the ash in the ash conveying pipe 26 from entering the air outlet 1 9, thereby avoiding the blockage of the chamber inside the auxiliary blowing valve due to the ash.

[0045] In order to enable the anti-blocking valve assembly 1003 to realize the one-way valve function, the anti-blocking valve assembly 1003 includes an elastic sheet 1003a, a chassis sheet 1003b, an anti-blocking valve sealing ring 1003e with a groove on the inner ring, and a connecting bolt 1003c. The elastic sheet 1003a is arranged at the lower part of the chassis sheet 1003b and is connected to the chassis sheet 1003b through the connecting bolt 1003c. A plurality of soot blowing vents 1003d are provided on the chassis sheet 1003b. The elastic sheet 1003a is made of soft material, and the chassis sheet 1003b is made of metal. The elastic sheet 1003a covers the plurality of soot blowing vents 1003d on the chassis sheet 1003b, and the chassis sheet 1003b is sleeved in the groove of the anti-blocking valve sealing ring 1003e.

[0046] When the high-pressure gas in the air outlet 1002 needs to rush out to blow and clean the blockage in the ash conveying pipe 26, a large amount of high-pressure gas flows toward the elastic sheet 1003a through the soot blowing vent 1003d, and pushes the elastic sheet 1003a open to deform it, so that a gap is generated between the elastic sheet 1003a and the chassis sheet 1003b. The high-pressure air quickly flows through the gap to the air outlet 1002 and blows toward the ash conveying pipe 26 to clean the blockage.

[0047] A connecting rod 11 is provided at one end of the main piston 8 near the air outlet chamber 6, and the connecting rod 11 can move forward and backward together with the main piston 8. A connecting sleeve 12 is provided at one end of the connecting rod 11 near the air inlet chamber 5, and the connecting sleeve 12 is sleeved on one end of the connecting rod 11, and the connecting sleeve 12 can move forward and backward together with the main piston 8. A secondary piston 13 is provided at one end of the connecting sleeve 12 away from the connecting rod 11, and the end of the connecting sleeve 12 away from the connecting rod 11 abuts against an end face of the secondary piston 13 near the connecting rod 11 sleeve, and when the main piston 8 moves, the secondary piston 13 is pushed to move through the connecting rod 11.

[0048] An adjusting nut 14 is also provided at one end of the air inlet chamber 5, and the adjusting nut 14 is connected to the valve body 1 by a threaded connection. A spring 15 is provided between the adjusting nut 14 and the auxiliary piston 13, and two ends of the spring 15 are respectively against the adjusting nut 14 and the auxiliary piston 13.

[0049] Specifically, an air vent 16 is provided on the air outlet 1 9 , and the air vent 16 unidirectionally penetrates the valve body 1 . An air vent 2 17 is provided on the end cover 2 , and the air vent 2 17 extends into the push chamber 3 .

[0050] In this embodiment, during specific use, multiple blowing-assisting valves will be arranged on the ash conveying pipe 26, and each blowing-assisting valve will be connected to each other. In order to realize the interconnection function between each ash conveying valve, the vent 16 on the previous blowing-assisting valve is connected to the vent 2 17 on the next blowing-assisting valve through the connecting air pipe 28.

[0051] Specifically, a sealing gasket 18 is provided between the end cover 2 and the main piston 8 . The sealing gasket 18 is arranged between the push chamber 3 and the main piston 8 , and a side of the sealing gasket 18 close to the main piston 8 contacts a side of the main piston 8 close to the end cover 2 .

[0052] In this embodiment, in order to ensure that the gas in the push chamber 3 does not flow into the piston chamber 7, a sealing gasket 18 is provided to isolate the push chamber 3 from the piston chamber 1. The sealing gasket 18 is made of rubber material to ensure that when the air pressure in the push chamber 3 increases, the sealing gasket 18 can be deformed to achieve the purpose of pushing the main piston 8.

[0053] Specifically, the valve body 1 is further provided with an adjusting hole 19 , which is connected with the air inlet hole 1 4 , and a flow regulating valve 20 is arranged in the adjusting hole 19 .

[0054] In this embodiment, the gas flow in the air inlet hole 14 can be adjusted by setting the adjustment hole 19 and the flow control valve 20.

[0055] Specifically, a sealing ring 1 21 is disposed in the middle of the connecting rod 11 , and a sealing ring 22 is disposed on the main piston 8 .

[0056] In this embodiment, the sealing ring 1 21 and the sealing ring 22 are mainly provided to play a sealing role, which is a conventional technical means and will not be described in detail in this case.

[0057] Specifically, the end cover 2 is provided with an air inlet hole 23 , one end of which is connected to the push chamber 3 , and one end of the air inlet hole 1 4 close to the end cover 2 passes through the sealing gasket 18 and is connected to the air inlet hole 23 .

[0058] In this embodiment, in order to facilitate the gas in the air inlet 4 to flow into the propulsion chamber 3, an air inlet hole 23 is provided on the end cover to facilitate the circulation of the gas.

[0059] Specifically, one end of the adjusting nut 14 away from the spring 15 is connected to an external air supply device, and the second air outlet 1002 is connected to an external ash conveying pipe 26 through a pipe fitting.

[0060] For details, please refer to Figure 5 In order to further prevent the ash in the ash conveying pipe 26 from entering the interior of the auxiliary blowing valve, an anti-blocking component 10 is added, and is connected to the valve body 1 through a gasket 24. During the specific design, a gasket 24 is provided between the anti-blocking component 10 and the valve body 1, and an anti-blocking valve component 1003 is also provided on the gasket 24. The outer shell 1001 on the anti-blocking component 10 and the gasket 24 are connected to the valve body 1 together by bolts. The gasket 24 is provided with a groove for installing an anti-blocking valve component 1003, and the anti-blocking valve component 1003 is installed in the groove by interference fit.

[0061] Working principle:

[0062] In specific use, a plurality of blow-assisting valves in this case will be arranged on the ash delivery pipe 26, and each blow-assisting valve is connected to each other. In order to realize the connection function between each blow-assisting valve, please refer to Figure 6 as well as Figures 1 to 5The vent 16 on the valve body 1 is connected to the vent 2 17 on the next blow-assisting valve through the connecting air pipe 28. The position of the adjusting nut 14 on each blow-assisting valve is connected to the air source pipe 25 through the connecting air pipe 29, and the air outlet 2 1002 on each anti-blocking component 10 is also connected to the ash delivery pipe 28 through the air pipe.

[0063] During normal operation, the high-pressure air in the air source pipe 25 is continuously delivered to the air inlet chamber 5, and then enters the air inlet hole 23 through the air inlet hole 1 4, and then enters the push chamber 3. At this time, since the interior of the ash delivery pipe 26 is not blocked, the gas pressure entering the push chamber 3 cannot push the main piston 8 to move. At this time, a small amount of gas in the air inlet hole 1 4 flows into the air outlet chamber 6 and flows to the anti-blocking component 10. The small amount of gas pushes the elastic sheet 1003a of the soft material open a little, and continuously flows from the air outlet 2 1002 to the ash delivery pipe 26 from the soot blowing vent 1003d, and a small amount of gas is replenished for the ash delivery pipe 26.

[0064] When the ash delivery pipe 26 is clogged with materials, the pressure in the ash delivery pipe 26 increases, which is greater than the pressure of the trace amount of flowing gas delivered to the ash delivery pipe 26, so that the elastic sheet 1003a is pressed against the bottom plate 1003b, completely covering the soot blowing vent 1003d. Trace gas cannot continue to enter the ash delivery pipe 26. Then, because the gas in the gas source pipe 25 is continuously delivered to the blow-assist valve, the pressure of the gas entering the air inlet hole 14 is continuously increased, and then the pressure in the push chamber 3 is continuously increased, so that the side with a large cross-sectional area of ​​the main piston 8 is subjected to a pushing force. As the gas pressure in the push chamber 3 continues to increase, the thrust on the side with a large cross-sectional area of ​​the main piston 8 is greater than the elastic force of the spring 15, and the main piston 8 pushes the connecting rod 11 to drive the auxiliary piston 13 to move in the direction of the spring 15. Then the spring 15 is compressed. After the spring 15 is compressed, a gap appears between the secondary piston 13 and the air outlet chamber 6. At this time, a large amount of gas source continuously flows from the gap into the air outlet chamber 6, and quickly pushes open the elastic sheet 1003a on the anti-blocking valve assembly 1003, allowing a large amount of gas to be blown out from the soot blowing vent 1003d, providing a large amount of high-pressure gas to the ash conveying pipe 26, blowing away the blockage and achieving the purpose of blowing.

[0065] When the ash delivery pipe 26 is blocked, high-pressure gas flows from the vent 16 to the vent 2 17 on the next blow-assisting valve. When the blockage has not yet moved to the next blow-assisting valve, the high-pressure gas is delivered to the push chamber 3 of the next blow-assisting valve in advance by connecting the vent 16 with the vent 2 17 of the next blow-assisting valve. Then, the spring 15 on the next blow-assisting valve is pushed, so that a large amount of gas is also quickly delivered from the anti-blocking component 10 to the ash delivery pipe 26, so as to achieve the purpose of clearing the ash in the ash delivery pipe 26 in advance, and to make the blowing of the blockage more convenient.

[0066] When the blockage in the ash delivery pipe 26 is cleaned and blown away, the pressure in the ash delivery pipe 26 drops, the main piston 8 loses its thrust, the spring 15 recovers from the compressed state to the initial state, the auxiliary piston 13 separates the air inlet chamber 5 from the air outlet chamber 6, and the air pressure state inside the entire auxiliary blowing valve recovers to the micro-flow state.

[0067] During the entire process of the blow-assist valve blowing out the blockage, a small amount of ash in the ash conveying pipe 26 will enter the air outlet 1002, but during the blowing, these ash will be washed away by a large amount of high-pressure gas. Compared with the prior art, the structure of spring and sphere can well solve the problem of ash getting stuck in the spring, causing the spring to fail and unable to be compressed, thus resulting in the inability to achieve blowing.

[0068] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0069] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An automatic blow-off valve for gray pipelines, comprising a valve body (1) and an end cover (2), wherein the valve body (1) and the end cover (2) are fixedly connected, and characterized in that: The valve body (1) is provided with an air inlet cavity (5) and an air outlet cavity (6) which are connected to each other, a push cavity (3) is provided between the end cover (2) and the valve body (1), and the valve body (1) is also provided with an air inlet hole (4), one end of the air inlet hole (4) is connected to the air inlet cavity (5), and the other end is connected to the push cavity (3), and the air outlet cavity (6) is connected to the middle part of the air inlet hole (4); The valve body (1) is also provided with a piston chamber (7), a main piston (8) that can move forward and backward is provided in the piston chamber (7), and the push chamber (3) is provided between the main piston (8) and the end cover (2); The valve body (1) is provided with an air outlet (9) which is in communication with the air outlet cavity (6), and an anti-blocking component (10) is provided at the lower part of the air outlet (9); The anti-blocking assembly (10) comprises a housing (1001) fixedly connected to the valve body (1), and a second air outlet (1002) and an anti-blocking valve assembly (1003) are provided in the housing (1001); The anti-blocking valve assembly (1003) is arranged between the first gas outlet (9) and the second gas outlet (1002); The anti-blocking valve assembly (1003) comprises an elastic sheet (1003a), a bottom plate (1003b), an anti-blocking valve sealing ring (1003e) with a groove on the inner ring, and a connecting bolt (1003c); the elastic sheet (1003a) is arranged at the lower part of the bottom plate (1003b) and connected to the bottom plate (1003b) through the connecting bolt (1003c); the bottom plate (1003b) is sleeved in the groove of the anti-blocking valve sealing ring (1003e); The bottom plate (1003b) is provided with a plurality of soot blowing vents (1003d), and the elastic plate (1003a) covers the plurality of soot blowing vents (1003d) on the bottom plate (1003b); The elastic sheet (1003a) is made of soft material, and the bottom plate (1003b) is made of metal material; A connecting rod (11) is provided at one end of the main piston (8) close to the air outlet chamber (6), and the connecting rod (11) can move forward and backward together with the main piston (8); A connecting sleeve (12) is provided at one end of the connecting rod (11) close to the air inlet chamber (5), and the connecting sleeve (12) is sleeved on one end of the connecting rod (11), and the connecting sleeve (12) can move forward and backward together with the main piston (8); A secondary piston (13) is provided at one end of the connecting sleeve (12) away from the connecting rod (11), and the end of the connecting sleeve (12) away from the connecting rod (11) abuts against an end surface of the secondary piston (13) close to the connecting rod (11) sleeve; An adjusting nut (14) is also provided at one end of the air inlet chamber (5), the adjusting nut (14) being connected to the valve body (1) by means of a threaded connection, and a spring (15) is provided between the adjusting nut (14) and the auxiliary piston (13), the two ends of the spring (15) respectively abutting against the adjusting nut (14) and the auxiliary piston (13).

2. The automatic blow-off valve for gray pipeline according to claim 1, characterized in that: The air outlet one (9) is provided with an air vent one (16), and the air vent one (16) penetrates the valve body (1) in one direction. The end cover (2) is provided with an air vent two (17), and the air vent two (17) extends into the push chamber (3).

3. The automatic blow-off valve for gray pipeline according to claim 1, characterized in that: A sealing gasket (18) is also provided between the end cover (2) and the main piston (8). The sealing gasket (18) is arranged between the push chamber (3) and the main piston (8), and a side surface of the sealing gasket (18) close to the main piston (8) is in contact with a side surface of the main piston (8) close to the end cover (2).

4. The automatic blow-off valve for gray pipeline according to claim 3 is characterized by: The valve body (1) is also provided with an adjusting hole (19), the adjusting hole (19) being connected to the air inlet hole 1 (4), and a flow regulating valve (20) being arranged in the adjusting hole (19).

5. The automatic blow-off valve for gray pipeline according to claim 1, characterized in that: A sealing ring 1 (21) is arranged in the middle of the connecting rod (11), and a sealing ring 2 (22) is arranged on the main piston (8).

6. The automatic blow-off valve for gray pipeline according to claim 3, characterized in that: The end cover (2) is provided with a second air inlet hole (23), one end of which is connected to the push chamber (3), and one end of the first air inlet hole (4) close to the end cover (2) passes through the sealing gasket (18) and is connected to the second air inlet hole (23).

7. The automatic blow-off valve for gray pipeline according to claim 1, characterized in that: The end of the adjusting nut (14) away from the spring (15) is connected to an external air supply device, and the second air outlet (1002) is connected to an external ash conveying pipe through a pipe fitting.

8. The automatic blow-off valve for gray pipeline according to claim 1, characterized in that: A cushion block (24) is provided between the anti-blocking component (10) and the valve body (1), and an anti-blocking valve component (1003) is also provided on the cushion block (24). The housing (1001) on the anti-blocking component (10) and the cushion block (24) are connected to the valve body (1) together by bolts. A groove for mounting and placing the anti-blocking valve component (1003) is provided on the cushion block (24), and the anti-blocking valve component (1003) is mounted in the groove by means of interference fit.

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