A knife-type pneumatic gate valve for a flour milling system

Abstract

The application discloses a knife type pneumatic gate valve for preventing powder leakage of a powder making system, and relates to the technical field of gate valves.The knife type pneumatic gate valve comprises a valve plate, a cylinder and a valve seat, the cylinder is fixedly installed at one end of the valve plate, the valve seat is fixedly installed at the surface center of the valve plate, an outlet pipe is slidably connected to the valve seat in an up-down mode, and a connecting flange is fixedly installed on the upper surface of the valve seat.In the process of moving the gate, the toothed plates on both sides of the gate drive the upper meshing gear to rotate, the rotation of the gear in the valve seat, the cooperation of the outlet pipe and the valve plate, the complete closure of the outlet, the isolation of the powder leakage of the gate valve, the clean of the upper gate in contact with the coal powder, the avoidance of the influence of the accumulated coal powder in the valve plate on the normal working performance of the valve seat, the extrusion of the transmission rod on the air cylinder, the inflow of the extruded gas in the air cylinder into the air bag at the lower periphery of the outlet pipe, and the higher sealing property of the connection between the outlet pipe and the gate when the valve plate is closed.

Description

Technical Field

[0001] This invention relates to the field of gate valve technology, and more particularly to a knife-type pneumatic gate valve for preventing powder leakage in a pulverizing system. Background Technology

[0002] Modern large and medium-sized thermal power plant boilers generally use pulverized coal combustion. Pulverized coal combustion involves feeding raw coal into a coal mill via a raw coal hopper and feeder in the boiler's pulverizing system. The coal is then ground into powder and sent to a pulverized coal silo for combustion, or directly fed into the boiler. In a thermal power plant, the system centered around the coal mill, which processes raw coal into qualified pulverized coal, is called the pulverizing system. This system is a crucial auxiliary system for coal-fired units; its function is to grind qualified pulverized coal to ensure the boiler's combustion needs are met. Its proper operation directly affects the boiler's safety and economic efficiency.

[0003] A pneumatic knife gate valve is a type of valve that uses a pneumatic actuator to control the valve, thereby achieving its opening and closing. It can be divided into two parts: the upper part is the pneumatic actuator, and the lower part is the valve. Research has found that in existing pulverizing systems, the valve at the pulverizing outlet does not effectively prevent pulverizing leakage, which is a major cause of coal dust overflow and dust pollution in power plants. A search revealed a Chinese patent (CN212131353U) proposing a pneumatic gate valve. This patented technology can effectively prevent material jamming and leakage. However, in the present invention, the coal dust particles are small, and due to the incomplete sealing of the gate valve, pulverizing leakage is more likely. Therefore, this invention proposes a pulverizing knife-type pneumatic gate valve for pulverizing systems to solve the problems mentioned in the background technology. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a leak-proof knife-type pneumatic gate valve for a powder-making system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A knife-type pneumatic gate valve for preventing powder leakage in a powder-making system includes a valve plate, a cylinder, and a valve seat. The cylinder is fixedly installed at one end of the valve plate, and the valve seat is fixedly installed at the center of the surface of the valve plate. A powder outlet pipe is slidably connected inside the valve seat, and a connecting flange is fixedly installed on the upper surface of the valve seat.

[0007] The valve plate is equipped with a gate plate connected to the cylinder. Air cylinders are fixedly installed on both the left and right sides of the valve plate. Pistons are installed inside the air cylinders, and transmission rods are connected to the outside of the pistons.

[0008] Preferably, a rotating rod is rotatably connected to one side of the lower part of the valve seat, and a rotating rod is rotatably connected to the other side of the lower part of the valve seat. Gears located inside the valve seat are fixedly installed at both ends of the rotating rod and the rotating rod.

[0009] Preferably, the gate is slidably connected to the valve plate, and toothed plates are fixedly connected to both the left and right sides of the gate, with the toothed plates meshing with several gears on the upper side.

[0010] Preferably, each of the gears has a rack meshing with it on one side, the racks slide up and down in the valve seat, and the racks are fixedly connected to the powder outlet pipe on their upper side.

[0011] Preferably, the surface of the gate is provided with a sealing groove for the powder outlet pipe, and a cleaning brush is fixedly installed on both sides of the upper rotating rod of the gate.

[0012] Preferably, a connecting plate is fixedly installed on the pneumatic rod that is fixedly connected to the gate inside the valve plate. The connecting plate slides inside the valve plate, and the left and right ends of the connecting plate are fixedly connected to the transmission rods on both sides of the valve plate, respectively.

[0013] Preferably, an air bladder is provided on the lower periphery of the powder outlet pipe, and a vent pipe is connected to the air cylinder, with both vent pipes on both sides communicating with the air bladder.

[0014] Preferably, rotating bars are fixedly installed at both ends of the rotating rod, and an actuating rod located on the lower side of the valve plate is fixedly connected between the two rotating bars.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. During the movement of the gate, the toothed plates on both sides of the gate drive the upper meshing gear to rotate. The rotation of the gear in the valve seat drives the side meshing rack to move up and down. The powder outlet pipe fixedly connected to the upper side of the rack moves accordingly. As the valve seat gradually seals, the powder outlet pipe also slowly moves down until the valve seat moves to the lower side of the powder outlet pipe and the powder outlet pipe is just inserted into the sealing groove on the surface of the valve plate. The powder outlet pipe cooperates with the valve plate to completely seal the powder outlet, thereby isolating the powder leakage problem of the gate valve.

[0017] 2. In this invention, while the gate moves back, the toothed plates on both sides of the gate drive the upper gear to rotate, and the rotating rod between the two gears rotates accordingly. The cleaning brush installed on the circumference of the rotating rod cleans the surface of the gate that passes under the valve seat, so that the gate that comes into contact with the coal powder on the upper side is cleaned, avoiding the accumulation of coal powder in the valve plate and affecting the normal working performance of the valve seat.

[0018] 3. In this invention, as the gate plate opens and closes, the gate plate moves within the valve plate, causing the gears meshing on the upper sides of the gate plate to rotate. The rotating rod between the two gears rotates back and forth accordingly. The reciprocating rotating rod, through the actuating rod connected to the rotating bars at both ends, reciprocates to knock the lower outlet of the valve plate, clearing the coal dust accumulated at the lower outlet of the valve seat and further cleaning the coal dust remaining inside the valve plate. At the same time as the valve plate is opened and closed by the cylinder, the connecting plate connected to the cylinder pushes the transmission rod to move at both ends. The transmission rod squeezes the air cylinder, and the gas squeezed by the air cylinder flows into the air bladder on the lower periphery of the powder outlet pipe. When the valve plate is closed, the air bladder inflates, making the connection between the powder outlet pipe and the gate plate more airtight. Attached Figure Description

[0019] Figure 1 This invention provides a schematic diagram of the structure of a knife-type pneumatic gate valve for preventing powder leakage in a powder-making system. Figure 1 ;

[0020] Figure 2 This invention provides a schematic diagram of the structure of a knife-type pneumatic gate valve for preventing powder leakage in a powder-making system. Figure 2 ;

[0021] Figure 3 This is a top view schematic diagram of a leak-proof knife-type pneumatic gate valve for a powder-making system proposed in this invention.

[0022] Figure 4 This is a top sectional view of a knife-type pneumatic gate valve for preventing powder leakage in a powder-making system, as proposed in this invention.

[0023] Figure 5 This is a front structural schematic diagram of a knife-type pneumatic gate valve for preventing powder leakage in a powder-making system proposed in this invention.

[0024] Figure 6 This is a front cross-sectional view of a knife-shaped pneumatic gate valve for preventing powder leakage in a powder-making system, as proposed in this invention.

[0025] In the diagram: 1. Valve plate; 2. Cylinder; 3. Valve seat; 4. Connecting flange; 5. Air cylinder; 6. Transmission rod; 7. Rotating rod one; 8. Rotating bar; 9. Vent pipe; 10. Gate plate; 11. Connecting plate; 12. Sealing groove; 13. Gear plate; 14. Rotating rod two; 15. Gear; 16. Rack; 17. Powder outlet pipe; 18. Air bag; 19. Actuating rod. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0027] Reference Figure 1-6 A knife-type pneumatic gate valve for preventing powder leakage in a powder-making system includes a valve plate 1, a cylinder 2, and a valve seat 3. The cylinder 2 is fixedly installed at one end of the valve plate 1, and the valve seat 3 is fixedly installed at the center of the surface of the valve plate 1. A powder outlet pipe 17 is slidably connected inside the valve seat 3, and a connecting flange 4 is fixedly installed on the upper surface of the valve seat 3. A rotating rod 7 is rotatably connected to one side of the lower part of the valve seat 3, and a rotating rod 14 is rotatably connected to the other side of the lower part of the valve seat 3. Gears 15 located inside the valve seat 3 are fixedly installed at both ends of the rotating rod 7 and the rotating rod 14.

[0028] Furthermore, a gate plate 10 connected to the cylinder 2 is provided inside the valve plate 1. A sealing groove 12 for the powder outlet pipe 17 is opened on the surface of the gate plate 10. A cleaning brush is fixedly installed around the upper rotating rod 14 of the gate plate 10. The gate plate 10 is slidably connected inside the valve plate 1. A toothed plate 13 is fixedly connected to both the left and right sides of the gate plate 10. The toothed plate 13 meshes with several gears 15 on the upper side. A rack 16 meshes with one side of each of the gears 15. The rack 16 slides up and down inside the valve seat 3. The rack 16 is fixedly connected to the powder outlet pipe 17 on the upper side. An air cylinder 5 is fixedly installed on both the left and right sides of the valve plate 1. A piston is provided inside the air cylinder 5. A transmission rod 6 is connected to the outside of the piston.

[0029] When using the leak-proof pneumatic gate valve in this pulverizing system, the gate valve is connected to the powder outlet of the pulverizing system via the connecting flange 4 on the valve seat 3. When the pneumatic gate valve is in operation, the cylinder 2 drives the gate 10 connected to it to move. As the gate 10 moves, it seals the powder outlet pipe 17 of the valve seat 3. During the movement of the gate 10, the toothed plates 13 on both sides of the gate 10 drive the upper meshing gear 15 to rotate. The rotation of the gear 15 within the valve seat 3 further drives the side meshing rack 16 to move up and down. The powder outlet pipe 17, fixedly connected to the upper side of the rack 16, then moves accordingly. As the valve seat 3 gradually seals... The powder outlet pipe 17 also slowly moves down until the valve seat 3 moves to the side directly below the powder outlet pipe 17. The powder outlet pipe 17 is then inserted into the sealing groove 12 on the surface of the gate 10. The powder outlet pipe 17 cooperates with the gate 10 to completely seal the powder outlet, thereby preventing the gate valve from leaking powder.

[0030] When the gate valve needs to be opened, the gate 10 is opened by the cylinder 2. As the gate 10 moves back, the valve plate 1 discharges the coal dust that has been left inside the valve plate 1. At the same time as the gate 10 moves back, the toothed plates 13 on both sides of the gate 10 drive the upper gear 15 to rotate. The rotating rod 14 between the two gears 15 rotates accordingly. The cleaning brush installed around the rotating rod 14 cleans the surface of the gate 10 that passes under the valve seat 3, so that the gate 10 that comes into contact with the coal dust on the upper side is cleaned, avoiding the accumulation of coal dust in the valve plate 1 and affecting the normal working performance of the valve seat 3.

[0031] Furthermore, a connecting plate 11 is fixedly installed on the pneumatic rod that is fixedly connected to the gate plate 10 inside the valve plate 1. The connecting plate 11 slides inside the valve plate 1, and the left and right ends of the connecting plate 11 are fixedly connected to the transmission rods 6 on both sides of the valve plate 1, respectively. An air bag 18 is provided on the lower periphery of the powder outlet pipe 17. An air pipe 9 is connected to the air cylinder 5, and both sides of the air pipe 9 are connected to the air bag 18. Rotary bars 8 are fixedly installed on both the left and right ends of the rotating rod 7, and an actuating rod 19 located on the lower side of the valve plate 1 is fixedly connected between the two rotating bars 8.

[0032] While the gate valve 10 is opening and closing, as the gate 10 moves within the valve plate 1, the gears 15 meshing on both sides of the gate 10 rotate. The rotating rod 7 between the two gears 15 rotates back and forth accordingly. The reciprocating rotating rod 7, through the actuating rod 19 connected to the rotating bars 8 at both ends, reciprocates to knock the lower outlet of the valve plate 1, clearing the coal dust accumulated at the lower outlet of the valve seat 3, and further cleaning the coal dust remaining inside the gate 10. At the same time as the cylinder 2 reciprocates to open and close the valve plate 1, the connecting plate 11 connected to the cylinder 2 pushes the transmission rod 6 to move at both ends. The transmission rod 6 squeezes the air cylinder 5, and the gas squeezed by the air cylinder 5 flows into the air bladder 18 on the lower periphery of the powder outlet pipe 17 through the vent pipe 9. When the valve plate 1 is closed, the air bladder 18 inflates, making the connection between the powder outlet pipe 17 and the gate 10 more airtight.

[0033] The specific working principle of this invention is as follows:

[0034] When using the leak-proof pneumatic gate valve in this pulverizing system, the gate valve is connected to the powder outlet of the pulverizing system via the connecting flange 4 on the valve seat 3. When the pneumatic gate valve is in operation, the cylinder 2 drives the gate 10 connected to it to move. As the gate 10 moves, it seals the powder outlet pipe 17 of the valve seat 3. During the movement of the gate 10, the toothed plates 13 on both sides of the gate 10 drive the upper meshing gear 15 to rotate. The rotation of the gear 15 within the valve seat 3 further drives the side meshing rack 16 to move up and down. The powder outlet pipe 17, fixedly connected to the upper side of the rack 16, then moves accordingly. As the valve seat 3 gradually seals... The powder outlet pipe 17 also slowly moves down until the valve seat 3 moves to the side directly below the powder outlet pipe 17. The powder outlet pipe 17 is then inserted into the sealing groove 12 on the surface of the gate 10. The powder outlet pipe 17 cooperates with the gate 10 to completely seal the powder outlet, thereby preventing the gate valve from leaking powder.

[0035] When the gate valve needs to be opened, the gate 10 is opened by the cylinder 2. As the gate 10 moves back, the valve plate 1 discharges the coal powder that has been leaked into the valve plate 1. At the same time as the gate 10 moves back, the toothed plates 13 on both sides of the gate 10 drive the upper gear 15 to rotate. The rotating rod 14 between the two gears 15 rotates accordingly. The cleaning brush installed around the rotating rod 14 cleans the surface of the gate 10 that passes under the valve seat 3, so that the gate 10 that comes into contact with the coal powder on the upper side is cleaned, so as to avoid the accumulation of coal powder in the valve plate 1 and affect the normal working performance of the valve seat 3.

[0036] While the gate valve 10 is opening and closing, as the gate 10 moves within the valve plate 1, the gears 15 meshing on both sides of the gate 10 rotate. The rotating rod 7 between the two gears 15 rotates back and forth accordingly. The reciprocating rotating rod 7, through the actuating rod 19 connected to the rotating bars 8 at both ends, reciprocates to knock the lower outlet of the valve plate 1, clearing the coal dust accumulated at the lower outlet of the valve seat 3, and further cleaning the coal dust remaining inside the gate 10. At the same time as the cylinder 2 reciprocates to open and close the valve plate 1, the connecting plate 11 connected to the cylinder 2 pushes the transmission rod 6 to move at both ends. The transmission rod 6 squeezes the air cylinder 5, and the gas squeezed by the air cylinder 5 flows into the air bladder 18 on the lower periphery of the powder outlet pipe 17 through the vent pipe 9. When the valve plate 1 is closed, the air bladder 18 inflates, making the connection between the powder outlet pipe 17 and the gate 10 more airtight and preventing powder leakage from the valve plate 1.

[0037] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A leak-proof pneumatic gate valve for a pulverizing system, comprising a valve plate (1), a cylinder (2), and a valve seat (3), characterized in that, The cylinder (2) is fixedly installed at one end of the valve plate (1), the valve seat (3) is fixedly installed at the center of the surface of the valve plate (1), the powder outlet pipe (17) is slidably connected inside the valve seat (3), and the connecting flange (4) is fixedly installed on the upper surface of the valve seat (3). The valve plate (1) is provided with a gate plate (10) connected to the cylinder (2). Air cylinders (5) are fixedly installed on both the left and right sides of the valve plate (1). A piston is provided inside the air cylinder (5), and a transmission rod (6) is connected to the outside of the piston. The lower side of the valve seat (3) is rotatably connected to a rotating rod (7), and the other side of the lower part of the valve seat (3) is rotatably connected to a rotating rod (14). Both the left and right ends of the rotating rod (7) and the rotating rod (14) are fixedly installed with gears (15) located inside the valve seat (3). The gate (10) is slidably connected to the valve plate (1). The left and right sides of the gate (10) are fixedly connected with toothed plates (13), and the toothed plates (13) mesh with several gears (15) on the upper side. A rack (16) meshing with each of the gears (15) is provided on one side. The racks (16) slide up and down in the valve seat (3) and are fixedly connected to the powder outlet pipe (17) on their upper side. The surface of the gate (10) is provided with a sealing groove (12) for the powder outlet pipe (17), and a cleaning brush is fixedly installed on the circumference of the upper rotating rod (14) of the gate (10).

2. The knife-type pneumatic gate valve for preventing powder leakage in a pulverizing system according to claim 1, characterized in that, A connecting plate (11) is fixedly installed on the pneumatic rod that is fixedly connected to the gate (10) inside the valve plate (1). The connecting plate (11) slides inside the valve plate (1), and the left and right ends of the connecting plate (11) are fixedly connected to the transmission rods (6) on both sides of the valve plate (1).

3. A knife-type pneumatic gate valve for preventing powder leakage in a pulverizing system according to claim 1, characterized in that, An airbag (18) is provided on the lower periphery of the powder outlet pipe (17), and an air pipe (9) is connected to the air cylinder (5), and the air pipes (9) on both sides are connected to the airbag (18).

4. A knife-type pneumatic gate valve for preventing powder leakage in a pulverizing system according to claim 1, characterized in that, Rotary bars (8) are fixedly installed at both ends of the rotating rod (7), and an actuating rod (19) located on the lower side of the valve plate (1) is fixedly connected between the two rotating bars (8).

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