Pilot operated automatic plug valve

Abstract

The application discloses a pilot type automatic briquetting valve, which comprises a valve body, a gas supply on-off mechanism, a piston and a piston rod, a first sealing cavity is formed in the first end of the valve body, a piston cavity is formed in the second end of the valve body, a second sealing cavity is formed in the middle part of the valve body, and the first sealing cavity and the second sealing cavity are communicated; and the gas supply on-off mechanism is installed in the first sealing cavity. By arranging the valve body, the gas supply on-off mechanism and the piston, the position where the pipe is blocked or is about to be blocked in the ash conveying pipe can be automatically supplemented with gas, so that the material movement speed is improved, and the phenomenon of blockage is avoided. By arranging the quick opening and closing mechanism, when a large amount of gas needs to be supplemented, the gas supply on-off mechanism can be quickly and largely opened by a small amount of pushing of the piston, so that a large amount of gas can be quickly supplemented into the ash conveying pipe, and the purpose of quickly dredging the pipeline and accelerating the material movement is achieved.

Description

Technical Field

[0001] This invention relates to the field of pneumatic ash conveying technology. Specifically, it relates to a pilot-operated automatic bolt-forming valve. Background Technology

[0002] Pneumatic conveying refers to the use of airflow as a power source to propel materials forward within a sealed pipeline. As the material moves within the pipeline, blockages can occur due to factors such as the pipeline itself, airflow speed, and material humidity. A common practice is to install a plug valve on the ash conveying pipe to supply compressed air to the blockage location and prevent further blockage. The plug valve opens automatically when the pressure inside the pipeline reaches a certain value. However, the opening speed and extent of the plug valve are related to the movement and speed of the driving piston, resulting in insufficient valve opening speed and extent when supplying compressed gas, preventing the rapid and large-scale replenishment of compressed gas. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a pilot-operated automatic valve that improves the opening and closing speeds.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a pilot-operated automatic valve, comprising a valve body, an air supply on / off mechanism, a piston, and a piston rod; a first sealing cavity is formed in the first end of the valve body, a piston cavity is formed in the second end of the valve body, and a second sealing cavity is formed in the middle of the valve body; the first sealing cavity and the second sealing cavity are in communication; the air supply on / off mechanism is installed in the first sealing cavity, and the air supply on / off mechanism is sealed and abutted against the inner wall of the first sealing cavity, separating the first sealing cavity and the second sealing cavity; an air supply port is installed on the valve body, and the air supply port is in communication with a compressed air source fluid; an air passage is formed in the valve body, one end of the air passage is in communication with the first sealing cavity fluid, and the other end of the air passage is in communication with the second sealing cavity and the piston cavity located on the side of the piston opposite to the first sealing cavity in sequence; The piston is slidably sealed within the piston cavity. One end of the piston rod is connected to the piston, and the other end of the piston rod extends out of the valve body and is connected to a tensioning mechanism. A quick-opening and closing mechanism is installed in the piston cavity near the first sealing cavity. One end of the quick-opening and closing mechanism is connected to the piston, and the other end of the quick-opening and closing mechanism extends into the second sealing cavity and is connected to the side wall of the gas supply on / off mechanism. The piston drives the gas supply on / off mechanism to move through the quick-opening and closing mechanism. A connecting pipe that is in fluid communication with the second sealing cavity is installed on the valve body, and the end of the connecting pipe is connected to the ash conveying pipe.

[0005] The aforementioned pilot-operated automatic plugging valve includes a rapid opening and closing mechanism comprising a support plate, a first hinge rod, a drive rod, and a second hinge rod. A fixed tube is fixedly installed inside the valve body, and a connecting arm extending into the piston chamber is fixedly connected to the fixed tube. The support plate is fixedly connected to the end of the connecting arm. Sliding grooves are formed along the length of both ends of the support plate, and sliders are slidably fitted within the sliding grooves. A first compression spring is connected to one side of each slider that is facing away from each other. The first compression spring is located within the sliding groove, and the other end of the first compression spring abuts against the groove wall. One end of the first hinge rod is hinged to the side wall of the slider on one end of the support plate, and one end of the second hinge rod is hinged to the side wall of the slider on the other end of the support plate. The drive rod passes through the fixed tube and is connected to the air supply on / off mechanism. The free ends of both the first and second hinge rods are hinged to the side wall of the drive rod.

[0006] In the aforementioned pilot-operated automatic throttling valve, the piston rod passes through the piston and is fixedly connected to the piston. A sliding hole is formed along the axial direction of the piston rod at one end near the first sealing cavity. A limit block is fixedly connected to the sliding hole near the opening. One end of the drive rod is inserted into the sliding hole and fixedly connected to an end block, which slides within the sliding hole. A top plate is attached to one end of the piston rod near the first sealing cavity, and the top plate is fixedly connected to the drive rod.

[0007] The aforementioned pilot-operated automatic valve has an air supply on / off mechanism comprising a push tube, a hinge seat, a first sealing plate, and a second sealing plate. The push tube passes through the fixed tube and slides within it. A drive rod passes through the push tube. A limit groove is formed within the push tube, and a first limit block slides within the limit groove. The first limit block is fixedly connected to the drive rod. One end of the push tube is inserted into the second sealing cavity. Hinge seats are symmetrically fixedly connected to both sides of the push tube. The first sealing plate is hinged to one hinge seat, and the second sealing plate is hinged to the other hinge seat. The side walls of the first and second sealing plates that are close to each other are sealed and fitted together. Both the first and second sealing plates are sealed and fitted together on the inner wall of the first sealing cavity. Spring pieces are fixedly connected to both hinge seats, and the ends of the two spring pieces are respectively pressed against the side walls of the first and second sealing plates.

[0008] In the aforementioned pilot-operated automatic plugging valve, the axial length of the limiting groove is greater than the axial length of the first limiting block. When the drive rod moves inside the push tube, the first limiting block contacts the groove wall of the limiting groove, causing the push tube to move synchronously.

[0009] In the aforementioned pilot-operated automatic plugging valve, two top posts are fixedly connected to the side wall of the first sealing chamber away from the piston chamber. The ends of the two top posts are respectively positioned opposite the edges of the first sealing plate and the second sealing plate. When the first sealing plate and the second sealing plate approach the top posts, the top posts push the first sealing plate and the second sealing plate to rotate along the hinge seat.

[0010] In the aforementioned pilot-operated automatic plugging valve, a sealing sleeve is provided between the push tube and the fixed tube, and a sealing sleeve is also provided between the push tube and the drive rod.

[0011] The aforementioned pilot-operated automatic plugging valve has an ash-blocking mechanism installed inside the connecting pipe. The ash-blocking mechanism includes a one-way valve assembly installed inside the connecting pipe. The one-way valve assembly includes a fixing plate and a sealing rubber plate. The fixing plate is fixedly installed inside the connecting pipe, and a through hole is provided on the circumference of the fixing plate. The sealing rubber plate is sealed and attached to the side wall of the fixing plate opposite to the valve body. The sealing rubber plate and the fixing plate are fixedly connected by bolts.

[0012] The aforementioned pilot-operated automatic plugging valve, wherein the ash-blocking mechanism further includes a drive assembly, which is fixedly installed on the outer wall of the connecting pipe. The drive assembly includes an outer cylinder, a movable plate, and a connecting rod. One end of the outer cylinder is vertically fixedly connected to the outer wall of the connecting pipe. The movable plate is sealed and slidably fitted inside the outer cylinder. Limiting platforms are fixedly connected to both sides of the movable plate on the inner wall of the outer cylinder. The distance between the limiting platforms is greater than the thickness of the movable plate. One end of the connecting rod is fixedly connected to the movable plate, and the other end of the connecting rod passes through the connecting pipe and enters the connecting pipe. A second protrusion is fixedly connected to the side wall of the connecting rod facing the sealing rubber plate. A first protrusion is fixedly connected to the side of the sealing rubber plate near the connecting rod. The first protrusion and the second protrusion correspond to each other. An air inlet and an exhaust outlet are provided on the outer cylinder. The air inlet is in fluid communication with the piston chamber located on the side of the piston near the first sealing cavity.

[0013] In the aforementioned pilot-operated automatic valve, a flow regulating screw is installed on the air passage near the first sealing cavity; the tensioning mechanism includes a second compression spring and a pressure plate, one end of the piston rod extends out of the valve body, the second compression spring is sleeved on the piston rod, one end of the second compression spring abuts against the valve body, the end of the piston rod is provided with an external thread, the pressure plate is provided with a threaded hole, and the pressure plate is threadedly connected to the external thread at the end of the piston rod and presses the second compression spring.

[0014] The technical solution of the present invention achieves the following beneficial technical effects: 1. By setting up a valve body in conjunction with an air supply on / off mechanism and a piston, it can automatically replenish air at the location where blockage has occurred or is about to occur in the ash conveying pipe, thereby improving the material movement speed and avoiding blockage.

[0015] 2. By setting up a rapid opening and closing mechanism, when a large amount of gas is needed, the piston can be pushed slightly to drive the gas supply on / off mechanism to open rapidly at a large angle, thereby quickly and in large quantities to replenish gas into the ash conveying pipe, thus improving the purpose of quickly clearing the pipeline and accelerating the material movement.

[0016] 3. By setting a separable first and second sealing plate, when a small or medium amount of gas replenishment is needed, the drive rod can be used to push the first and second sealing plates to open a certain gap to allow compressed gas to pass through. Compared with the traditional method of opening a single sealing plate, a small amount of opening and closing does not require moving the entire sealing plate, which helps to improve the sensitivity of opening and closing and speed up the response. When a large amount of gas replenishment is needed, the first and second sealing plates can be separated to reduce the obstruction of the compressed gas flow, thus facilitating the rapid passage of compressed gas.

[0017] 4. By setting the drive component, when a large amount of air is replenished, the drive component drives the second protrusion to be offset from the first protrusion, so as not to restrict the opening and closing angle of the sealing rubber plate, thus facilitating the passage of a large amount of compressed air; when replenishing a small, medium amount of air, the second protrusion corresponds to the first protrusion, restricting the opening and closing angle of the sealing rubber plate, thus helping to improve the closing speed of the sealing rubber plate and preventing dust from flowing back into the valve body. Attached Figure Description

[0018] Figure 1 A schematic cross-sectional view of the present invention when it is closed; Figure 2 A cross-sectional structural diagram of the present invention when it is in operation; Figure 3 A cross-sectional structural schematic diagram of the rapid opening and closing mechanism of the present invention; Figure 4 A top view of the rapid opening and closing mechanism of the present invention; Figure 5 This invention Figure 3 A partially enlarged structural diagram; Figure 6 A cross-sectional structural schematic diagram of the gas supply on / off mechanism of the present invention; Figure 7 A cross-sectional structural diagram of the dust-blocking mechanism of the present invention.

[0019] The reference numerals in the figure are as follows: 1-valve body; 2-first sealing cavity; 3-second sealing cavity; 4-piston cavity; 5-piston; 6-connecting pipe; 7-air supply on / off mechanism; 701-push pipe; 702-hinged seat; 703-spring; 704-first sealing plate; 705-second sealing plate; 706-first limiting block; 707-limiting groove; 708-top column; 8-quick opening and closing mechanism; 801-fixed pipe; 802-connecting arm; 803-support plate; 804-slide groove; 805-first compression spring; 806-slider; 807-first hinge rod; 808- Drive rod; 809-Second hinge rod; 810-Top plate; 811-Limit block; 812-End block; 9-Dust blocking mechanism; 901-One-way valve assembly; 902-Fixing plate; 903-Sealing rubber plate; 904-First protrusion; 905-Drive assembly; 906-Outer cylinder; 907-Modible plate; 908-Connecting rod; 909-Air inlet; 910-Exhaust port; 911-Limit platform; 912-Second protrusion; 10-Piston rod; 101-Sliding hole; 11-Second compression spring; 12-Air passage; 13-Air supply port; 14-Pressure plate; 15-External thread. Detailed Implementation

[0020] The pilot-operated automatic plugging valve in this embodiment, such as Figure 1-2 As shown, the valve includes a valve body 1, an air supply switching mechanism 7, a piston 5, and a piston rod 10. A first sealing cavity 2 is formed in the first end of the valve body 1, a piston cavity 4 is formed in the second end of the valve body 1, and a second sealing cavity 3 is formed in the middle of the valve body 1. The first sealing cavity 2 and the second sealing cavity 3 are connected. The air supply switching mechanism 7 is installed in the first sealing cavity 2. The air supply switching mechanism 7 is sealed and abuts against the inner wall of the first sealing cavity 2 and separates the first sealing cavity 2 and the second sealing cavity 3. An air supply port 13 is installed on the valve body 1 and is connected to a compressed air source fluid. An air passage 12 is formed in the valve body 1. One end of the air passage 12 is connected to the first sealing cavity 2 fluid, and the other end of the air passage 12 is connected to the second sealing cavity 3 and the piston cavity 4 located on the side of the piston 5 away from the first sealing cavity 2 fluid. A flow adjustment screw is installed on the air passage 12 near the first sealing cavity 2.

[0021] The piston 5 is sealed and slidably fitted inside the piston chamber 4. One end of the piston rod 10 is connected to the piston 5, and the other end of the piston rod 10 passes through the valve body 1 and is connected to a tensioning mechanism. The tensioning mechanism includes a second compression spring 11 and a pressure plate 14. One end of the piston rod 10 passes through the valve body 1, and the second compression spring 11 is sleeved on the piston rod 10. One end of the second compression spring 11 abuts against the valve body 1. An external thread 15 is provided on the end of the piston rod 10, and a threaded hole is provided on the pressure plate 14. The pressure plate 14 is threadedly connected to the external thread 15 at the end of the piston rod 10 and presses the second compression spring 11.

[0022] A quick-opening and closing mechanism 8 is installed in the piston chamber 4 on the side of the piston 5 near the first sealing chamber 2. One end of the quick-opening and closing mechanism 8 is connected to the piston 5, and the other end of the quick-opening and closing mechanism 8 passes through the second sealing chamber 3 and is connected to the side wall of the air supply on / off mechanism 7. The piston 5 drives the air supply on / off mechanism 7 to move through the quick-opening and closing mechanism 8. A connecting pipe 6 that is in fluid communication with the second sealing chamber 3 is installed on the valve body 1. The end of the connecting pipe 6 is connected to the ash conveying pipe. By setting the valve body 1 in conjunction with the air supply on / off mechanism 7 and the piston 5, the valve body 1 can automatically replenish air at the location where the ash conveying pipe is blocked or about to be blocked, thereby improving the material movement speed and avoiding blockage.

[0023] like Figure 3-4 As shown, the quick-opening and closing mechanism 8 includes a support plate 803, a first hinge rod 807, a drive rod 808, and a second hinge rod 809. A fixed tube 801 is fixedly installed inside the valve body 1. A connecting arm 802 extending into the piston chamber 4 is fixedly connected to the fixed tube 801. A support plate 803 is fixedly connected to the end of the connecting arm 802. Slide grooves 804 are formed along the length of both ends of the support plate 803. Sliding blocks 806 are slidably fitted in the slide grooves 804. A first compression spring 805 is connected to the opposite side of each of the two sliding blocks 806. The first compression spring 805 is located in the slide groove 804, and the other end of the first compression spring 805 abuts against the groove wall of the slide groove 804. One end of the first hinge rod 807 is hinged to the side wall of the slider 806 on one end of the support plate 803, and one end of the second hinge rod 809 is hinged to the side wall of the slider 806 on the other end of the support plate 803. The drive rod 808 passes through the fixed pipe 801 and is connected to the gas supply on / off mechanism 7. The free ends of the first hinge rod 807 and the second hinge rod 809 are both hinged to the side wall of the drive rod 808. By setting the quick opening and closing mechanism 8, when a large amount of gas is needed, the small push of the piston 5 can realize the rapid large-angle opening of the gas supply on / off mechanism 7, thereby realizing the rapid and large-scale replenishment of gas into the ash conveying pipe, thereby improving the purpose of quickly clearing the pipeline and accelerating the material operation.

[0024] like Figure 3 , Figure 5 As shown, piston rod 10 passes through piston 5 and is fixedly connected to piston 5. A sliding hole 101 is provided on the end of piston rod 10 near the first sealing cavity 2 along the axial direction of piston rod 10. A limit block 811 is fixedly connected in the sliding hole 101 near the opening. One end of drive rod 808 is inserted into the sliding hole 101 and is fixedly connected to an end block 812. The end block 812 is slidably fitted in the sliding hole 101. A top plate 810 is attached to the end of piston rod 10 near the first sealing cavity 2. The top plate 810 is fixedly connected to drive rod 808.

[0025] like Figure 1 , Figure 6As shown, the gas supply switching mechanism 7 includes a push pipe 701, a hinge seat 702, a first sealing plate 704, and a second sealing plate 705. The push pipe 701 passes through the fixed pipe 801 and slides with it. A drive rod 808 passes through the push pipe 701. A sealing sleeve is provided between the push pipe 701 and the fixed pipe 801, and another sealing sleeve is provided between the push pipe 701 and the drive rod 808. A limit groove 707 is formed in the push pipe 701, and a first limit block 706 slides within the limit groove 707. The first limit block 706 is fixedly connected to the drive rod 808. One end of the push pipe 701 is inserted into the second sealing cavity 3. Hinges 702 are symmetrically fixedly connected to both sides of the push pipe 701. The first sealing plate 704 is hinged. On one hinge seat 702, the second sealing plate 705 is hinged to the other hinge seat 702. The side walls of the first sealing plate 704 and the second sealing plate 705 that are close to each other are sealed and fitted together. The first sealing plate 704 and the second sealing plate 705 are both sealed and fitted together on the inner wall of the first sealing cavity 2. Spring pieces 703 are fixedly connected to both hinge seats 702. The ends of the two spring pieces 703 are pressed against the side walls of the first sealing plate 704 and the second sealing plate 705, respectively. The elastic force of the two spring pieces 703 is small, only needing to ensure the sealing plate is reset, and does not provide sealing force. At the same time, the friction between the push tube 701 and the fixed tube 801 is greater than the friction between the drive rod 808 and the push tube 701.

[0026] By setting a separable first sealing plate 704 and a second sealing plate 705, when a small or medium amount of gas replenishment is required, the drive rod 808 can be used to push the first sealing plate 704 and the second sealing plate 705 to open a certain gap, allowing compressed gas to pass through. Compared with the traditional method of opening a whole sealing plate, a small amount of opening and closing does not require moving the entire sealing plate, which helps to improve the sensitivity of opening and closing and speed up the response. When a large amount of gas replenishment is required, the first sealing plate 704 and the second sealing plate 705 can be separated, reducing the obstruction to the compressed gas flow, thus facilitating the rapid passage of compressed gas.

[0027] like Figure 6 As shown, the axial length of the limiting groove 707 is greater than the axial length of the first limiting block 706. When the driving rod 808 moves inside the push tube 701, the first limiting block 706 contacts the groove wall of the limiting groove 707 and drives the push tube 701 to move synchronously.

[0028] like Figure 1-2 As shown, two top posts 708 are fixedly connected to the side wall of the first sealing cavity 2 away from the piston cavity 4. The ends of the two top posts 708 are respectively facing the edge of the first sealing plate 704 and the edge of the second sealing plate 705. When the first sealing plate 704 and the second sealing plate 705 are close to the top posts 708, the top posts 708 push the first sealing plate 704 and the second sealing plate 705 to rotate along the hinge seat 702.

[0029] like Figure 1 , Figure 7 As shown, a dust-blocking mechanism 9 is installed inside the connecting pipe 6. The dust-blocking mechanism 9 includes a one-way valve assembly 901, which is installed inside the connecting pipe 6. The one-way valve assembly 901 includes a fixing plate 902 and a sealing rubber plate 903. The fixing plate 902 is fixedly installed inside the connecting pipe 6, and a through hole is opened on the circumference of the fixing plate 902. The sealing rubber plate 903 is sealed and attached to the side wall of the fixing plate 902 away from the valve body 1. The sealing rubber plate 903 and the fixing plate 902 are fixedly connected by bolts in the middle.

[0030] like Figure 7 As shown, the dust-blocking mechanism 9 also includes a drive assembly 905, which is fixedly installed on the outer wall of the connecting pipe 6. The drive assembly 905 includes an outer cylinder 906, a movable plate 907, and a connecting rod 908. One end of the outer cylinder 906 is vertically fixedly connected to the outer wall of the connecting pipe 6. The movable plate 907 is slidably fitted inside the outer cylinder 906. Limiting platforms 911 are fixedly connected to both sides of the movable plate 907 on the inner wall of the outer cylinder 906. The distance between the limiting platforms 911 is greater than the thickness of the movable plate 907. One end of the connecting rod 908 is fixedly connected to the movable plate 907, and the other end of the connecting rod 908 passes through the connecting pipe 6 and enters the connecting pipe 6. A second protrusion 912 is fixedly connected to the side wall of the connecting rod 908 facing the sealing rubber plate 903. A first protrusion 904 is fixedly connected to the side near the connecting rod 908. The first protrusion 904 and the second protrusion 912 correspond to each other. An air inlet 909 and an exhaust port 910 are provided on the outer cylinder 906. The air inlet 909 is in fluid communication with the piston chamber 4 located on the side of the piston 5 near the first sealing chamber 2. By setting the drive assembly 905, when a large amount of air is replenished, the drive assembly 905 drives the second protrusion 912 to be offset from the first protrusion 904, so as not to restrict the opening and closing angle of the sealing rubber plate 903, which is conducive to the passage of a large amount of compressed air. When replenishing a small amount, a small amount, or a medium amount of air, the second protrusion 912 corresponds to the first protrusion 904, which restricts the opening and closing angle of the sealing rubber plate 903, which is conducive to improving the closing speed of the sealing rubber plate 903 and preventing dust from flowing back into the valve body.

[0031] Workflow: such as Figure 1 As shown, the air supply port 13 is connected to the compressed air source, and the connecting pipe 6 is connected to the ash conveying pipe. Under normal pressure conditions in the ash conveying pipe, under the action of the second compression spring 11, the piston 5 is located at the rightmost position of the piston chamber 4. Compressed air enters the second sealing chamber 3 and one side of the piston chamber 4 through the air passage 12, and then enters the ash conveying pipe through the one-way valve assembly 901. Due to the action of the throttling screw, the pressure in the first sealing chamber 2 is slightly greater than the pressure in the second sealing chamber 3 and the piston chamber 4.

[0032] Small or medium amount of air replenishment: When the ash conveying pipe is about to become blocked, its internal pressure increases. At this time, the flow rate entering the ash conveying pipe through the one-way valve assembly 901 decreases, and the pressure in the second sealing chamber 3 and piston chamber 4 gradually increases. Since the area of ​​piston 5 is larger than that of the first sealing plate 704 and the second sealing plate 705, piston 5 can provide greater thrust under the same air pressure. When the pressure rises to a certain value, piston 5 overcomes the elastic force of the second compression spring 11 and moves to the left, driving piston rod 10 to push top plate 810. Top plate 810 drives drive rod 808 to move synchronously, causing drive rod 808 to push the edges of first sealing plate 704 and second sealing plate 705, causing first sealing plate 704 and second sealing plate 705 to move and open a certain gap, allowing compressed air to pass through the gap for air replenishment. Since the movement of piston 5 is small, it will not trigger the quick opening and closing mechanism 8 and drive assembly 905.

[0033] Large-scale air replenishment: When a blockage suddenly occurs in the ash conveying pipe, the pressure inside the pipe rises rapidly. Piston 5 drives piston rod 10 to push the top plate 810, causing drive rod 808 to move to the left. Simultaneously, it drives the first hinge rod 807 and the second hinge rod 809 to move to the left. The sliders 806 at the ends of the first hinge rod 807 and the second hinge rod 809 move away from each other within the groove 804, compressing the first compression spring 805 until the first hinge rod 807 and the second hinge rod 809 are parallel. When drive rod 808 is continued to be pushed, the first hinge rod 807 and the second hinge rod 809, under the elastic force of the first compression spring 805, quickly swing to the left, driving... The drive rod 808 moves rapidly to the left, its end inserting into the sliding hole 101. Unrestricted by the speed and displacement of the piston 5, it directly and quickly pushes the air supply on / off mechanism 7 open, achieving a large-volume air replenishment effect. Simultaneously, as the drive rod 808 moves, it drives the first limiting block 706 to move within the limiting groove 707. When the first limiting block 706 contacts the left side wall of the limiting groove 707, it drives the push tube 701 to move synchronously to the left, causing the first sealing plate 704 and the second sealing plate 705 to move to the left. When they contact the top column 708, the first sealing plate 704 and the second sealing plate 705 are pushed and opened, achieving a large-flow air replenishment. At the same time, as... Figure 7As shown, due to the high speed of piston 5, the airflow on the other side of the compression piston chamber 4 enters the outer cylinder 906, causing the pressure inside the outer cylinder 906 to rise instantaneously. This pushes the movable plate 907 to the right and drives the connecting rod 908 to the right, causing the second protrusion 912 and the first protrusion 904 to be misaligned, thus not restricting the opening and closing angle of the sealing rubber plate 903. When the pressure inside the ash conveying pipe decreases or fluctuates within a certain range, the piston 5 moves to the right within a certain range, which drives the end block 812 through the limit block 811, causing the drive rod 808 to move backward a certain distance. When the quick opening and closing mechanism 8 does not reset, it can continuously ensure a large flow of air replenishment until the pipe is completely cleared.

[0034] After the blockage is cleared, the pressure applied to the piston 5 decreases. Under the action of the second compression spring 11, the piston 5, piston rod 10, quick opening and closing mechanism 8 and air supply on / off mechanism 7 are reset. At the same time, under the action of air pressure, the movable plate 907 of the drive assembly 905 is also reset.

[0035] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of the claims of this patent application.

Claims

1. A pilot-operated automatic plugging valve, characterized in that, It includes a valve body (1), an air supply on / off mechanism (7), a piston (5) and a piston rod (10). A first sealing cavity (2) is provided in the first end of the valve body (1), a piston cavity (4) is provided in the second end of the valve body (1), and a second sealing cavity (3) is provided in the middle of the valve body (1). The first sealing cavity (2) and the second sealing cavity (3) are connected. The gas supply switching mechanism (7) is installed in the first sealing cavity (2). The gas supply switching mechanism (7) is sealed and attached to the inner wall of the first sealing cavity (2) to separate the first sealing cavity (2) and the second sealing cavity (3). A gas supply port (13) is installed on the valve body (1). The gas supply port (13) is connected to the compressed gas source fluid. An air passage (12) is opened in the valve body (1). One end of the air passage (12) is connected to the first sealing cavity (2) fluid. The other end of the air passage (12) is connected to the second sealing cavity (3) and the piston cavity (4) located on the side of the piston (5) away from the first sealing cavity (2) fluid. The piston (5) is sealed and slidably fitted in the piston cavity (4). One end of the piston rod (10) is connected to the piston (5), and the other end of the piston rod (10) passes through the valve body (1) and is connected to a tensioning mechanism. A quick opening and closing mechanism (8) is installed in the piston cavity (4) on the side of the piston (5) near the first sealing cavity (2). One end of the quick opening and closing mechanism (8) is connected to the piston (5), and the other end of the quick opening and closing mechanism (8) passes through the second sealing cavity (3) and is connected to the side wall of the gas supply switching mechanism (7). The piston (5) drives the gas supply switching mechanism (7) to move through the quick opening and closing mechanism (8). A connecting pipe (6) that is in fluid communication with the second sealing cavity (3) is installed on the valve body (1). The end of the connecting pipe (6) is connected to the ash conveying pipe. The gas supply switching mechanism (7) includes a push tube (701), a hinge seat (702), a first sealing plate (704), and a second sealing plate (705). The push tube (701) is symmetrically fixedly connected to the two sides of the hinge seat (702). The first sealing plate (704) is hinged to one of the hinge seats (702), and the second sealing plate (705) is hinged to the other hinge seat (702). Two top posts (708) are fixedly connected to the side wall of the first sealing cavity (2) away from the piston cavity (4). The ends of the two top posts (708) are respectively facing the edge of the first sealing plate (704) and the edge of the second sealing plate (705). When the first sealing plate (704) and the second sealing plate (705) are close to the top posts (708), the top posts (708) push the first sealing plate (704) and the second sealing plate (705) to rotate along the hinge seat (702).

2. The pilot-operated automatic plugging valve according to claim 1, characterized in that, The rapid opening and closing mechanism (8) includes a support plate (803), a first hinge rod (807), a drive rod (808), and a second hinge rod (809). A fixed tube (801) is fixedly installed inside the valve body (1). A connecting arm (802) extending into the piston chamber (4) is fixedly connected to the fixed tube (801). The support plate (803) is fixedly connected to the end of the connecting arm (802). Slide grooves (804) are provided at both ends of the support plate (803) along its length. Sliding blocks (806) are slidably fitted in the slide grooves (804). A first compression spring (805) is connected to the opposite side of each of the two sliding blocks (806). A compression spring (805) is located in the groove (804), and the other end of the first compression spring (805) abuts against the groove wall of the groove (804); one end of the first hinge rod (807) is hinged to the side wall of the slider (806) on one end of the support plate (803), one end of the second hinge rod (809) is hinged to the side wall of the slider (806) on the other end of the support plate (803), the drive rod (808) passes through the fixed tube (801) and is connected to the air supply on / off mechanism (7), and the free end of the first hinge rod (807) and the free end of the second hinge rod (809) are both hinged to the side wall of the drive rod (808).

3. The pilot-operated automatic plugging valve according to claim 2, characterized in that, The piston rod (10) passes through the piston (5) and is fixedly connected to the piston (5). A sliding hole (101) is provided on the end of the piston rod (10) near the first sealing cavity (2) along the axial direction of the piston rod (10). A limit block (811) is fixedly connected in the sliding hole (101) near the opening. One end of the drive rod (808) is inserted into the sliding hole (101) and a head block (812) is fixedly connected thereto. The head block (812) slides in the sliding hole (101). A top plate (810) is attached to the end of the piston rod (10) near the first sealing cavity (2). The top plate (810) is fixedly connected to the drive rod (808).

4. The pilot-operated automatic plugging valve according to claim 3, characterized in that, The push tube (701) passes through the fixed tube (801) and slides with the fixed tube (801). The drive rod (808) passes through the push tube (701). A limiting groove (707) is formed in the push tube (701). A first limiting block (706) slides in the limiting groove (707). The first limiting block (706) is fixedly connected to the drive rod (808). One end of the push tube (701) is inserted into the second sealing cavity (3). The first sealing plate (704) and the second sealing plate (705) are sealed together on their adjacent side walls, and both the first sealing plate (704) and the second sealing plate (705) are sealed together on the inner side wall of the first sealing cavity (2); two spring pieces (703) are fixedly connected to the two hinge seats (702), and the ends of the two spring pieces (703) are respectively pressed against the side wall of the first sealing plate (704) and the side wall of the second sealing plate (705).

5. The pilot-operated automatic plugging valve according to claim 4, characterized in that, The axial length of the limiting groove (707) is greater than the axial length of the first limiting block (706). When the driving rod (808) moves inside the push tube (701), the first limiting block (706) contacts the groove wall of the limiting groove (707) and drives the push tube (701) to move synchronously.

6. The pilot-operated automatic plugging valve according to claim 4, characterized in that, A sealing sleeve is provided between the push tube (701) and the fixed tube (801), and a sealing sleeve is also provided between the push tube (701) and the drive rod (808).

7. The pilot-operated automatic plugging valve according to claim 1, characterized in that, A dust-blocking mechanism (9) is installed inside the connecting pipe (6). The dust-blocking mechanism (9) includes a one-way valve assembly (901). The one-way valve assembly (901) is installed inside the connecting pipe (6). The one-way valve assembly (901) includes a fixing plate (902) and a sealing rubber plate (903). The fixing plate (902) is fixedly installed inside the connecting pipe (6), and a through hole is opened on the circumference of the fixing plate (902). The sealing rubber plate (903) is sealed and attached to the side wall of the fixing plate (902) away from the valve body (1). The sealing rubber plate (903) and the fixing plate (902) are fixedly connected in the middle by bolts.

8. The pilot-operated automatic plugging valve according to claim 7, characterized in that, The dust-blocking mechanism (9) further includes a drive assembly (905), which is fixedly installed on the outer wall of the connecting pipe (6). The drive assembly (905) includes an outer cylinder (906), a movable plate (907), and a connecting rod (908). One end of the outer cylinder (906) is vertically fixedly connected to the outer wall of the connecting pipe (6). The movable plate (907) is sealed and slidably fitted inside the outer cylinder (906). Limiting platforms (911) are fixedly connected on both sides of the movable plate (907) on the inner wall of the outer cylinder (906). The distance between the limiting platforms (911) is greater than the thickness of the movable plate (907). One end of the connecting rod (908) is connected to the outer cylinder (906). The movable plate (907) is fixedly connected, and the other end of the connecting rod (908) passes through the connecting pipe (6) and enters the connecting pipe (6). A second protrusion (912) is fixedly connected to the side wall of the connecting rod (908) facing the sealing rubber plate (903). A first protrusion (904) is fixedly connected to the side of the sealing rubber plate (903) near the connecting rod (908). The first protrusion (904) and the second protrusion (912) correspond to each other. An air inlet (909) and an exhaust port (910) are provided on the outer cylinder (906). The air inlet (909) is fluidly connected to the piston chamber (4) located on the side of the piston (5) near the first sealing chamber (2).

9. The pilot-operated automatic plugging valve according to claim 1, characterized in that, A flow adjustment screw is installed on the air passage (12) near the first sealing cavity (2); the tensioning mechanism includes a second compression spring (11) and a pressure plate (14). One end of the piston rod (10) passes through the valve body (1). The second compression spring (11) is sleeved on the piston rod (10). One end of the second compression spring (11) abuts against the valve body (1). An external thread (15) is provided on the end of the piston rod (10). A threaded hole is provided on the pressure plate (14). The pressure plate (14) is threadedly connected to the external thread (15) at the end of the piston rod (10) and presses the second compression spring (11).

Images