Knife gate valve for powder

Abstract

The invention discloses a knife gate valve for powder, which belongs to the technical field of valves, is used for solving the problem that the knife gate valve in a powder conveying pipeline cannot be normally opened and closed due to accumulation of powder in a valve cover cavity, and comprises a valve body, a valve cover and a gate plate, and is also provided with a purging port, a purging port, a powder discharge port, an elliptical material collecting pocket and a flange observation port, according to the powder cleaning device, online or regular powder cleaning is achieved through structural improvement, the valve is prevented from being jammed, long-term stable operation of the valve is guaranteed, equipment faults and the maintenance cost are reduced, the service life of the valve is prolonged, the service life of the valve is prolonged, and the service life of the valve is prolonged. The device is suitable for powder on-off control of a powder conveying pipeline, and has remarkable economic benefits and popularization value.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically to a knife gate valve for powder materials, which is suitable for controlling the on / off state of powder materials in powder conveying pipelines and can effectively prevent the accumulation of powder materials in the valve cover cavity, thus avoiding valve malfunctions. Background Technology

[0002] In powder conveying pipelines, knife gate valves are commonly used to control the on / off flow of powder. In existing technology, when a knife gate valve is installed horizontally, although a packing seal structure is used at the gate between the valve cover and the valve body, a small amount of powder can still enter the valve cover cavity during valve opening and closing. After repeated opening and closing operations, the powder gradually fills the valve cover cavity, causing the knife gate valve to jam and fail to open and close normally. This necessitates frequent valve replacements, severely impacting normal production operations and increasing equipment maintenance costs and production downtime losses. Summary of the Invention

[0003] To address the problem that existing knife gate valves for powder materials suffer from valve jamming and inability to open and close properly due to powder accumulation in the valve cover cavity, thus affecting production, this invention aims to provide a knife gate valve for powder materials. Through structural improvements, it enables online or periodic cleaning of powder in the valve cover cavity, avoiding powder jamming, ensuring long-term stable valve operation, and guaranteeing continuous production.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0005] The present invention provides a knife gate valve for powder materials, characterized in that it includes a valve body, a valve cover, a gate plate, and further includes a purge port, a powder discharge port, an elliptical collection bag, and a flange observation port;

[0006] The purge port 1 and the purge port are located on the valve cover and are used to purge the powder in the valve cover cavity; the elliptical collection hopper is located below the valve cover and the powder discharge port is connected to the elliptical collection hopper and is used to discharge the powder in the collection hopper; the flange observation port is a detachable flange structure and is used to observe the powder accumulation in the valve cover.

[0007] Preferably, there are two purge ports and purge port 2, which are respectively located at different positions on the valve cover to form a multi-directional purge of the valve cover cavity.

[0008] Preferably, the opening size of the elliptical collection bag is larger than that of a conventional circular collection structure to increase the space for powder collection.

[0009] Preferably, the flange observation port adopts a bolted detachable structure for easy disassembly and observation.

[0010] Preferably, the powder discharge port is connected to a control valve to control the timing and flow rate of powder discharge.

[0011] Preferably, the sealing part between the gate and the valve body is sealed with packing, which, together with the purging action of the purge port, reduces the amount of powder entering the valve cover cavity.

[0012] Preferably, the surface of the gate facing the valve cover cavity is provided with a polytetrafluoroethylene anti-stick coating, the thickness of which is 0.3mm-0.8mm, to reduce the adhesion and residue of powder on the surface of the gate.

[0013] Preferably, it also includes a pressure sensor, which is embedded in the inner wall of the valve cover cavity and is used to detect the powder accumulation pressure in the valve cover cavity. The pressure sensor is electrically connected to the purge port and the control valve of the purge port, and can automatically start or stop the purge according to the detected pressure.

[0014] Preferably, the sealing part between the gate and the valve body is further provided with a dustproof sealing ring. The dustproof sealing ring is located on the outside of the packing seal, and its cross-section is U-shaped with the opening facing the inside of the valve body, which is used to prevent powder from penetrating into the packing seal.

[0015] Preferably, the inner wall of the elliptical collection bag is provided with an inclined guide surface, the angle between the inclined guide surface and the horizontal plane is 30°-45°, and it is inclined towards the powder discharge port 3 along the powder flow direction, so as to guide the powder in the collection bag to converge towards the discharge port.

[0016] Beneficial effects: This invention effectively prevents powder accumulation in the valve cover cavity through multi-directional blowing via dual purge ports; the elliptical collection hopper increases the space for powder collection and discharge, enabling rapid powder discharge in conjunction with the powder discharge port; the flange observation port facilitates online observation of the internal condition, achieving precise cleaning. This ensures long-term stable valve operation, reduces valve failure frequency and replacement frequency, lowers equipment maintenance costs, and guarantees continuous and stable production, demonstrating significant economic benefits and promotional value. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the knife gate valve for powder materials according to the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] In the description of the invention, it should be noted that the terms "upper", "lower", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0020] In the description of the invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0021] Technical solution and principle:

[0022] The powder gate valve of the present invention includes a valve body, a valve cover, and a gate plate, and is further provided with a purge port 1, a purge port 2, a powder discharge port 3, an elliptical collection hopper 4, and a flange observation port 5. The purge ports 1 and 2 are located on the valve cover and are used to introduce a purge medium, such as compressed air, to purge the powder inside the valve cover cavity. The elliptical collection hopper 4 is located below the valve cover and has a larger volume than conventional collection structures, effectively collecting powder. The powder discharge port 3 is connected to the elliptical collection hopper 4 and is used to discharge the collected powder from the valve. The flange observation port 5 is a detachable flange structure, facilitating the operator's observation of the powder accumulation inside the valve cover and aiding in determining the appropriate time for cleaning.

[0023] Example 1:

[0024] like Figure 1 As shown, the powder gate valve of the present invention consists of a valve body, a valve cover, a gate, a purge port 1, a purge port 2, a powder discharge port 3, an elliptical collection hopper 4, and a flange observation port 5. In practical applications, this gate valve is connected to the powder conveying pipeline and installed horizontally. After the valve has been in use for a period of time, a small amount of powder entering the valve cover cavity will accumulate in the elliptical collection hopper 4 under the action of gravity and the purge medium. The operator can directly observe the powder accumulation in the valve cover by disassembling the flange observation port 5. When cleaning is required, the purge medium supply to purge ports 1 and 2 is opened, and compressed air or other media blow the powder in the valve cover cavity towards the elliptical collection hopper 4. Then, the control valve of the powder discharge port 3 is opened to discharge the powder out of the pipeline. Among them, the purging pressure and time of purging ports 1 and 2 can be adjusted according to the actual powder characteristics to ensure the purging effect; the elliptical structure design of the elliptical collection bag 4 gives it the advantages of large volume and smooth discharge channel; the flange observation port 5 adopts a bolt-connected detachable structure, which makes disassembly and assembly simple and efficient.

[0025] Through the above structural design and operation method, the knife gate valve of the present invention can operate stably for a long time, completely solving the problem of valve jamming caused by powder accumulation in the prior art.

[0026] Example 2: Operating method of a knife gate valve for powder materials

[0027] I. Preparations before operation

[0028] Confirm that the installation conditions of the gate valve for the powder to be operated meet the design requirements, and that the characteristics of the powder medium in the pipeline, such as particle size and humidity, are compatible with the valve. Inspect the appearance of each valve component, confirming that components such as purge port 1, purge port 2, powder discharge port 3, and flange observation port 5 are free from physical damage and that all connections are secure. If pressure sensors, control valves, or other electrical control components are installed, confirm that their circuit connections are normal and that the control system is in standby mode.

[0029] II. Valve opening and closing operation

[0030] To open the valve, slowly rotate the gate drive mechanism (such as a handwheel or electric actuator) to move the gate in the opening direction. Observe the gate's movement to ensure there is no jamming or abnormal noise until the gate is fully open, allowing the powder medium to pass normally through the valve body channel. To close the valve, slowly rotate the gate drive mechanism to move the gate in the closing direction. Once the gate is in contact with the valve body sealing surface, stop the operation to ensure the powder medium is effectively cut off.

[0031] III. Powder Cleaning Operation

[0032] To observe the powder accumulation, remove the connecting bolts of flange observation port 5, open flange observation port 5, and directly observe the degree of powder accumulation in the valve cover cavity and the elliptical collection bag 4. If a pressure sensor is installed, its detection data can help determine when the pressure value reaches the preset threshold, prompting the need for cleaning. For the purging operation, introduce the required purging medium (such as dry compressed air) into purging ports 1 and 2, adjust the medium pressure to 0.4MPa-0.6MPa, and continue purging for 2-5 minutes to blow the powder in the valve cover cavity towards the elliptical collection bag 4. If a pressure sensor is installed and electrically connected to the purging control valve, the automatic purging mode can be activated, and the sensor will automatically control the start and stop of purging based on the pressure data. For the powder discharge operation, open the control valve of powder discharge port 3, allowing the powder in the elliptical collection bag 4 to be smoothly discharged along the inclined guide surface to the designated collection device. After discharge, close the control valve of powder discharge port 3, reinstall and tighten flange observation port 5.

[0033] IV. Maintenance and Inspection Operations

[0034] For the sealing performance check, after closing the valve, introduce a test medium (such as a simulated medium with similar powder characteristics) into the pipeline and check for leaks at the packing seal and dustproof sealing ring between the gate and the valve body. For the component condition check, inspect the PTFE anti-stick coating on the gate surface. If damaged or peeling is found, repair or replace the gate promptly. Inspect the inclined guide surface of the elliptical collection hopper 4 to ensure it is free from deformation and scale buildup; clean any scale present. Calibrate the pressure sensor to ensure accurate data readings. For periodic maintenance, clean the interfaces of purge port 1 and purge port 2 every 300-500 hours of operation to prevent blockage; lubricate the transmission parts of the gate drive device with grease.

[0035] V. Abnormal Handling

[0036] If the valve becomes stuck during operation, stop immediately and check through the flange inspection port 5 to see if it is due to powder accumulation. If it is powder accumulation, clean it according to the "Powder Cleaning Operation" procedure before trying to operate again. If it is a mechanical component failure, stop the machine and disassemble and inspect the gate, drive device, and other components. If leakage is found in the sealing area, first check if the seal is worn. If the packing seal is worn, adjust the preload of the packing gland. If the dustproof sealing ring or the gate sealing surface is damaged, the corresponding sealing component needs to be replaced.

[0037] Finally, it should be noted that the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A knife gate valve for powder materials, characterized by, It comprises a valve body, a valve cover, a gate plate, a blowing port (1), a blowing port (2), a powder discharge port (3), an oval material collecting pocket (4), and a flange observation port (5). The blowing port (1) and the blowing port (2) are arranged at the valve cover part and used for blowing the powder in the valve cover cavity; the oval material collecting pocket (4) is arranged below the valve cover, the powder discharge port (3) is connected with the oval material collecting pocket (4) and used for discharging the powder in the material collecting pocket; and the flange observation port (5) is a detachable flange structure and used for observing the powder accumulation in the valve cover.

2. A knife gate valve for powder according to claim 1, characterized in that The blowing port (1) and the blowing port (2) are two and arranged at different positions of the valve cover to form multi-directional blowing of the valve cover cavity.

3. A knife gate valve for powder according to claim 1 or 2, characterized in that The opening size of the oval material collecting pocket (4) is larger than that of a conventional circular material collecting structure to increase the powder collecting space.

4. A knife gate valve for powder according to claim 1, characterized in that, The flange observation port (5) adopts a detachable structure connected by bolts, which is convenient for disassembly and observation.

5. A knife gate valve for powder according to claim 1 or 2 or 4, characterized in that, The powder discharge port (3) is connected with a control valve to realize control of the time and flow of powder discharge.

6. A knife gate valve for powder according to claim 1, characterized in that, The sealing part of the gate plate and the valve body adopts a packing seal, which cooperates with the blowing effect of the blowing port to reduce the amount of powder entering the valve cover cavity.

7. A knife gate valve for powder material according to claim 1, characterized in that The surface of the gate plate facing the valve cover cavity is provided with a polytetrafluoroethylene anti-sticking coating, and the thickness of the anti-sticking coating is 0.3mm-0.8mm, which is used for reducing the adhesion and residue of the powder on the surface of the gate plate.

8. A knife gate valve for powder according to claim 1, characterized in that, It further comprises a pressure sensor embedded in the inner wall of the valve cover cavity, which is used for detecting the powder accumulation pressure in the valve cover cavity, and the pressure sensor is electrically connected with the control valves of the blowing port (1) and the blowing port (2) to automatically start or stop blowing according to the detected pressure.

9. A knife gate valve for powder according to claim 1, characterized in that, The sealing part of the gate plate and the valve body is further provided with a dustproof sealing ring, which is located outside the packing seal, has a U-shaped cross section, and has an opening facing the inside of the valve body, which is used for blocking the penetration of the powder to the packing seal.

10. A knife gate valve for powder according to claim 3, characterized in that The inner wall of the oval material collecting pocket (4) is provided with an inclined flow guide surface, the included angle between the inclined flow guide surface and the horizontal plane is 30°-45°, and the inclined flow guide surface is inclined to the powder discharge port (3) along the powder flow direction, which is used for guiding the powder in the material collecting pocket to converge to the discharge port.

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