Pneumatic slag discharge valve

Abstract

The utility model discloses a pneumatic deslagging valve which comprises a valve body, an upper flange, a lower flange and a pneumatic actuator arranged outside the valve body, a valve rod is installed on the valve body corresponding to an inlet of the valve body in the horizontal direction, a valve plate is installed on the valve rod in the valve body, and the head of the valve rod is located outside the valve body and connected with the pneumatic actuator. The two valve rods are arranged on the two sides of the upper portion in the valve body respectively, opening and closing of the two valve plates are achieved through the pneumatic actuator, and the size of an inner opening of the upper flange is smaller than that of an inner opening of the valve body. Compared with a single turning plate structure or a gate plate structure of a knife gate valve, the gate valve has the advantages that opening and closing are easier, it is guaranteed that the valve plate is opened and closed in place, closing is tight, operation and cleaning are easy, and the problem that people are injured in the slag discharging process of the molten salt chlorination furnace can be solved. The double valve rods are arranged on the two sides of the inner wall of the upper portion of the valve body, waste is prevented from falling onto the valve rods, corrosion to the valve rods is reduced, and it is guaranteed that the valve rods can be opened and closed freely and flexibly for a long time.

Description

Technical Field

[0001] This utility model relates to a pneumatic valve, and more particularly to a pneumatic slag discharge valve. Background Technology

[0002] In the metal smelting industry, molten salt chlorination furnaces generate a large amount of waste slag during operation, which must be discharged promptly. After discharge, workers must replace the slag hopper immediately to ensure normal production. Currently, when discharging slag waste from molten salt chlorination furnaces, a common practice is to directly connect the hopper to the furnace's slag discharge flange to receive the waste slag. This waste slag is very hot and hard. Before replacing the hopper, workers must first disassemble it from the furnace's slag discharge flange. During hopper replacement, there is a risk of hot, hard slag falling from the furnace's slag discharge port, which could burn or injure workers, leading to accidents. The method of installing a pneumatic knife gate valve between the molten salt chlorination furnace and the slag discharge bucket was used to solve the above problems. However, in actual production operation, it was found that after a period of operation, the knife gate valve would not open or close properly, or would become stuck. This is because the slag waste discharged from the molten salt chlorination furnace is extremely hard. Some of the slag crystallizes and solidifies after cooling on the slag discharge furnace inlet, the knife gate valve seat, and the sealing surface of the knife gate valve plate. The gate plate has insufficient driving force, resulting in the knife gate valve not opening or closing properly, which still poses a risk of injury. At the same time, the molten salt chlorination furnace needs to be shut down to replace or repair the pneumatic knife gate valve, causing downtime and increasing production costs. Summary of the Invention

[0003] In order to overcome the above-mentioned problems in the slag discharge equipment of molten salt chlorination furnace, this utility model provides a pneumatic slag discharge valve.

[0004] The technical solution of this utility model is: a pneumatic slag discharge valve, including a valve body, an upper flange, a lower flange, and a pneumatic actuator placed outside the valve body. A valve stem is installed horizontally on the valve body corresponding to the valve body inlet. A valve plate is installed inside the valve body on the valve stem. The head of the valve stem is located outside the valve body and connected to the pneumatic actuator. The special feature is that there are two valve stems, which are respectively arranged on both sides of the upper part of the valve body. The pneumatic actuator realizes the opening and closing of the two valve plates. The inner diameter of the upper flange is smaller than the inner diameter of the valve body.

[0005] Furthermore, the valve body is square, and the valve plate is rectangular, with both valve plates in the closed state sealing the valve body inlet.

[0006] Furthermore, a packing gland is installed on the valve stem head, with PTFE packing installed in between, and the pneumatic actuator is mounted on the valve body via a bracket; a tailstock gland is installed on the valve body at the tail end corresponding to the valve stem via bolts.

[0007] Furthermore, the valve body is connected to the lower flange by welding; an upper flange connecting pipe is connected between the valve body and the upper flange; and the lower flange is connected to the slag discharge cylinder by bolts.

[0008] Furthermore, the upper flange connecting pipe is connected to the upper flange and to the valve body by welding.

[0009] Furthermore, an elongated groove is formed on the surface of the valve stem, and the valve plate is embedded in the elongated groove.

[0010] Furthermore, the pneumatic actuator includes two cylinders, a solenoid valve, and air pipe one and air pipe two. Port A of the solenoid valve is used to connect to the air source, and ports B and C of the solenoid valve are connected to air pipe one and air pipe two, respectively. Air pipe one is connected to the area between the two pistons of each cylinder, and air pipe two is connected to the area outside the two pistons of each cylinder. The cylinder rods of the two cylinders drive the valve rods on both sides respectively. When the air source enters through air pipe one, the two valve rods rotate downwards by 90 degrees simultaneously, and the two valve plates open to both sides simultaneously. When the solenoid valve is energized, the pneumatic actuator exhausts air, the two valve rods rotate upwards by 90 degrees simultaneously, and the two valve plates close simultaneously.

[0011] The beneficial effects of this utility model are:

[0012] (1) The valve plate adopts a square opening and closing structure and uses a double cylinder to control the valve plate action, which can ensure that the valve plate opening and closing has a stronger driving force. Compared with the single flap structure or the gate structure of the knife gate valve, it is easier to open and close, ensuring that the valve plate opening and closing action is in place, the closure is tight, easy to operate and easy to clean, and can solve the problem of injury accidents during the slag discharge process of molten salt chlorination furnace.

[0013] (2) The inner diameter of the upper flange is smaller than the inner diameter of the valve body. The double valve stems are positioned on both sides of the upper inner wall of the valve body to prevent waste from falling onto the valve stems, reduce corrosion of the valve stems, and ensure that the valve stems can open and close freely and flexibly for a long time. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 yes Figure 1 Top view;

[0016] Figure 3 yes Figure 1 AA section view;

[0017] Figure 4 yes Figure 1 Schematic diagram of the installation structure of the valve stem and valve plate;

[0018] Figure 5This is a pneumatic principle diagram of the pneumatic actuator when the valve is opened according to this utility model;

[0019] Figure 6 This is a pneumatic principle diagram of the pneumatic actuator when the valve is closed according to this utility model. Detailed Implementation

[0020] like Figures 1-4 As shown, the pneumatic slag discharge valve of this utility model includes a square valve body 2, an upper flange 13, a lower flange 14, and a pneumatic actuator 4 placed outside the valve body 2. The pneumatic actuator 4 is mounted on the valve body 2 via a bracket 3. Bolts 11 are installed between the bracket 3 and the pneumatic actuator 4, and bolts 9 are installed between the bracket 3 and the valve body 2. A valve stem 7 is installed horizontally on the valve body 2 corresponding to the valve body inlet. A rectangular valve plate 12 is installed inside the valve body 2, with the head of the valve stem 7 located outside the valve body 2 and connected to the pneumatic actuator 4. There are two valve stems 7, which are respectively arranged on both sides of the upper part inside the valve body 2. The pneumatic actuator realizes the opening and closing of the two valve plates 12. When the two valve plates 12 are in the closed state, the valve body inlet is sealed. The upper flange 13 is DN600, and the square valve body 2 is 820×820×725mm in size. The upper flange 13 is connected to the inlet of the valve body 2 through a stainless steel upper flange connecting pipe 15 with an outer diameter of 630mm.

[0021] A packing gland 8 is installed at the head of the valve stem 7, with PTFE packing 10 installed in between. A tail seat gland 1 is installed on the valve body 2 at the tail of the valve stem 7 via bolts 5, and a PTFE gasket 6 is provided between the valve body 2 and the tail seat gland 1.

[0022] In one embodiment of this utility model, the valve body 2 is connected to the lower flange 14 by welding, and the lower flange 14 is connected to the slag discharge cylinder by bolts. The upper flange connecting pipe 15 is connected to the upper flange 13 and to the valve body 2 by welding.

[0023] In one embodiment of the present invention, an elongated groove 701 is formed on the surface of the valve stem 7, and the valve plate 12 is embedded in the elongated groove 701.

[0024] In one embodiment of this utility model, the pneumatic actuator 4 includes two cylinders 401, cylinder rods 402, pistons 403, air pipe one 404, air pipe two 405, and a 24V two-way solenoid valve 406. Port a of the solenoid valve 406 is used to connect to the air source, and ports b and c of the solenoid valve 406 are respectively connected to air pipe one 404 and air pipe two 405. Air pipe one 404 is connected to the area between it and the two pistons 403 of each cylinder, and air pipe two 405 is connected to the area outside the area between it and the two pistons 403 of each cylinder. The cylinder rods 402 of the two cylinders drive the valve rods 7 on both sides respectively. When the air source enters through air pipe one 404, the two valve rods rotate downward 90 degrees at the same time, and the two valve plates 12 open to both sides at the same time. When the solenoid valve 406 is energized, the pneumatic actuator exhausts air, the two valve rods 7 rotate upward 90 degrees at the same time, and the two valve plates 12 close at the same time.

[0025] In one embodiment of this utility model, the upper flange, square valve body, valve stem, valve plate and lower flange are all made of 316L. 316L has strong corrosion resistance and greatly extends the service life of the valve.

[0026] After the pneumatic slag discharge valve is installed and debugged, the opening and closing functions of the pneumatic actuator are set through the PLC. In the initial state, the valve is fully open. When the worker needs to replace the material hopper, the solenoid valve is energized under the action of the PLC. Through exhaust, the valve plate 12 closes at the same time. The worker removes the lower flange bolts to replace the new material hopper. After replacing the new material hopper, the material hopper and the lower flange 14 are fixed and locked with bolts. After being fixed and locked, the pneumatic actuator is connected to the air source under the command of the PLC. Under the drive of the pneumatic actuator, the two valve plates 12 open at the same time, and the slag waste is discharged normally.

[0027] like Figures 5-6 As shown, the main driving mechanism of this pneumatic slag discharge valve adopts a dual-cylinder pneumatic actuator, which drives the two valve stems on both sides respectively. When the air source enters through the air pipe 404 via the solenoid valve 406 (at this time, the solenoid valve is closed and not energized), the piston 402 in the cylinder moves to both sides under the pressure of the air source. The gas outside the piston is discharged from the exhaust port. At the same time, the rotating shaft (cylinder rod 403) in the middle of the cylinder rotates under the drive of the rack, which in turn drives the valve stem 7 connected to it to rotate downward by 90°, and the valve plate 12 opens at the same time. When 24V is supplied... When the solenoid valve is energized, it generates a magnetic field. Under the action of the magnetic field, the valve core of the solenoid valve is attracted, which connects the valve seat and the valve core, causing the positions of the air inlet and exhaust port of the solenoid valve 406 to change. The original exhaust port becomes the air inlet, and the original air inlet becomes the exhaust port. Under the action of air source pressure, the piston 402 in the cylinder begins to move from both sides to the middle. The air inside the piston is discharged from the exhaust port under pressure. The central rotating shaft rotates under the drive of the rack. The rotating shaft drives the two valve rods 7 to rotate upward 90 degrees at the same time, and the two valve plates 12 close at the same time.

Claims

1. A pneumatic slag discharge valve, comprising a valve body (2), an upper flange (13), a lower flange (14), and a pneumatic actuator (4) disposed outside the valve body (2), wherein a valve stem (7) is installed horizontally on the valve body (2) corresponding to the valve body inlet, and a valve plate (12) is installed inside the valve body (2) on the valve stem (7), wherein the head of the valve stem (7) is located outside the valve body (2) and connected to the pneumatic actuator (4), characterized in that, There are two valve stems (7) and they are respectively set on the upper sides of the valve body (2). The two valve plates are opened and closed by a pneumatic actuator (4). The inner diameter of the upper flange (13) is smaller than the inner diameter of the valve body (2).

2. The pneumatic slag discharge valve according to claim 1, characterized in that, The valve body (2) is square, and the valve plate (12) is rectangular. When both valve plates (12) are in the closed state, the valve body inlet is sealed.

3. The pneumatic slag discharge valve according to claim 1, characterized in that, The valve stem (7) is fitted with a packing gland (8) and PTFE packing (10) is installed in between. The pneumatic actuator (4) is mounted on the valve body (2) via a bracket (3). A tailstock gland (1) is installed on the valve body (2) at the tail end of the valve stem (7) via bolts (6).

4. The pneumatic slag discharge valve according to claim 1, characterized in that, The valve body (2) is connected to the lower flange (14) by welding, and the lower flange (14) is connected to the slag discharge cylinder by bolts; an upper flange connecting pipe (15) is connected between the valve body (2) and the upper flange (13).

5. The pneumatic slag discharge valve according to claim 4, characterized in that, The upper flange connecting pipe (15) is connected to the upper flange (13) and the valve body (2) by welding.

6. The pneumatic slag discharge valve according to claim 1, characterized in that, The valve stem (7) has an elongated groove (701) on its surface, and the valve plate (12) is fitted into the elongated groove (701).

7. The pneumatic slag discharge valve according to claim 1, characterized in that, The pneumatic actuator (4) includes two cylinders (401), pistons (402), cylinder rods (403), air pipe one (404), air pipe two (405), and a solenoid valve (406). Port a of the solenoid valve (406) is connected to an air source. Ports b and c of the solenoid valve (406) are connected to air pipe one (404) and air pipe two (405), respectively. Air pipe one (404) and the two pistons (402) in each cylinder (401) are connected to each other. The areas between 02) are connected, and the areas outside the two pistons (402) of each cylinder (401) are connected. The two cylinder rods (403) drive the valve rods (7) on both sides respectively. When the air source enters through the air pipe (404), the two valve rods rotate downward 90 degrees at the same time, and the two valve plates open to both sides at the same time. When the solenoid valve is energized, the pneumatic actuator exhausts, the two valve rods rotate upward 90 degrees at the same time, and the two valve plates close at the same time.

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