A two-way seal two-piece knife gate valve

Abstract

The present application relates to the technical field of knife gate valve, and discloses a bidirectional sealing two-piece knife gate valve, which comprises a butt joint assembly used for butt joint with a pipeline, a sealing assembly used for sealing is arranged at the upper end of the butt joint assembly, a knife gate blocking mechanism used for blocking the flow transmission in the butt joint assembly is arranged in the butt joint assembly in a longitudinal and movable manner, a driving mechanism drives a transmission shaft to rotate, the transmission is transmitted to a contactless magnetic coupling transmission mechanism, a driving coupling sleeve is rotated to form a magnetic coupling, a transmission permanent magnet drives a transmission coupling shaft to rotate synchronously, the power is transmitted to a transmission column in a cleaning assembly through a three-section universal joint, a scraper continuously cleans the surface of a positioning disc, deposition is prevented from accumulating, the opening and closing of the knife gate is ensured to be smooth, the operation cycle of the equipment is significantly prolonged, and the number of maintenance is reduced, the whole system realizes the trinity of opening, closing and sealing, the power transmission is efficient and contactless and wearless, and the problems of deposition, adhesion, opening and closing jamming and maintenance difficulty of the traditional knife gate valve are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of knife gate valve technology, specifically a bidirectional sealing two-piece knife gate valve. Background Technology

[0002] The bidirectional sealing two-piece knife gate valve is a compact industrial valve with excellent sealing performance, widely used in media such as slurry, pulp, chemical, and sewage treatment. It consists of two symmetrical valve bodies with a knife-shaped gate sandwiched in the middle, which can achieve bidirectional cutoff of the medium and has sealing functions in both directions. Compared with unidirectional sealing valves, the bidirectional sealing knife gate valve has no directional restriction during installation and is more suitable for working conditions where the flow direction is uncertain or frequent switching of direction is required. It is flexible in opening and closing, easy to maintain, and is particularly suitable for occasions containing granular, fibrous, or high-viscosity materials. It is one of the key control devices in the conveying system.

[0003] In existing technologies, traditional bidirectional sealing two-piece knife gate valves have certain structural defects during operation, especially in the design of the gate area. Since the gate surface needs to directly contact the conveyed medium, such as slurry, pulp, chemical materials, or sewage, solid particles, impurities, or high-viscosity components in the medium are easily deposited and adhered to the gate surface. After long-term operation, these deposits gradually accumulate, causing the gate surface to thicken, resulting in uneven gate opening and closing, or even jamming, affecting the normal operation of the valve. In addition, long-term deposit adhesion may also cause wear or deformation of the sealing surface, reducing sealing performance and creating a risk of media leakage. What is even more inconvenient is that in daily maintenance, in order to clean the deposits or deal with jamming problems, it is often necessary to disassemble the entire knife gate valve, which is time-consuming and labor-intensive, affecting equipment operating efficiency, increasing maintenance costs, and posing a risk of interruption to continuous operation systems. Therefore, we propose a bidirectional sealing two-piece knife gate valve. Summary of the Invention

[0004] The purpose of this invention is to provide a bidirectional sealing two-piece knife gate valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a bidirectional sealing two-piece knife gate valve, comprising a docking assembly for connecting with a pipeline, a sealing assembly for sealing at the upper end of the docking assembly, a knife gate blocking mechanism for blocking the internal flow transmission of the docking assembly being longitudinally movably disposed inside the docking assembly, and cleaning components for cleaning the surface of the knife gate blocking mechanism being disposed at both ends of the docking assembly on both sides of the knife gate blocking mechanism, a driving mechanism for driving the knife gate blocking mechanism and the two cleaning components to operate at the upper end of the sealing assembly, and two contactless magnetic coupling transmission mechanisms for sealing and transmitting kinetic energy and driving the two cleaning components to operate respectively at the center of the outer side of the docking assembly near both ends.

[0006] Preferably, the docking assembly includes a sealing cavity, and guide strips are fixedly connected to the center of the two opposing inner walls of the sealing cavity. Material conveying pipes are fixedly sleeved on both sides inside the sealing cavity, and mounting holes are opened at the upper center of the two material conveying pipes.

[0007] Preferably, the outer ends of the two conveying pipes that are far apart from each other are fixedly connected with mating flange rings, and the upper center of the two opposite sides of the sealing cavity is fixedly connected with a lower ear piece. The lower center of the two opposing inner walls of the sealing cavity is provided with a sealing groove, and a first sealing ring is fitted inside the two sealing grooves.

[0008] Preferably, the sealing assembly includes a rectangular pressure ring, which is mounted on the upper end of the sealing cavity. A sealing cover is fixedly fitted at the center of the rectangular pressure ring, and a sealing gasket is placed between the rectangular pressure ring and the sealing cavity. The rectangular pressure ring and the sealing cavity are fastened together by multiple bolts. A sealing tube is fixedly fitted at the upper center of the sealing cover, and a sealing ring is fixedly fitted at the center of the sealing tube. A screw is fixedly fitted inside the sealing ring, and upper lugs are fixedly connected to the center of each of the opposite sides of the sealing cover.

[0009] Preferably, the knife gate blocking mechanism includes an internal threaded block, which is threaded onto the outside of the lead screw. Connecting pieces are fixedly connected to both sides of the internal threaded block that are far apart from each other. A mating plate is fixedly connected to the lower end of each of the two connecting pieces. A central connecting column is fixedly connected at the center between the two mating plates. A movable hole for accommodating the lead screw is longitudinally opened through the center of the central connecting column. Clamping plates are fixedly connected to the central areas of both sides of the two mating plates that are far apart from each other.

[0010] Preferably, two clamping plates on one side clamp the outside of one guide strip, and two clamping plates on the other side clamp the outside of the other guide strip. The four clamping plates and the two guide strips are in sliding contact to provide longitudinal sliding guidance. Positioning discs are fixedly connected to the center of the two mating discs on opposite sides. A second sealing ring is fixedly sleeved on the outside of the two positioning discs. The opposite sides of the two second sealing rings are in abutting contact with the opposite sides of the two first sealing rings. The two second sealing rings and the two first sealing rings are in separable contact.

[0011] Preferably, the driving mechanism includes two drive shafts and a drive gear. The two drive shafts are rotatably connected to the lower and upper lugs on one side and the lower and upper lugs on the other side respectively via bearings. The drive gear is fixedly sleeved on the outer center of the lead screw. A lower limit plate is fixedly connected to the upper center of the drive gear. Both drive shafts are fixedly sleeved on the outer center of the upper side, and the two drive gears are meshed with the drive gear. A threaded column is fixedly connected to the upper center of the lower limit plate, and an upper limit plate is fixedly connected to the upper end of the threaded column. Multiple guide rods are arranged in a ring and fixedly sleeved on the inner center of the drive gear near the edge. A handwheel is longitudinally slidably sleeved on the outer side of the multiple guide rods. The inner center of the handwheel is threaded on the outer side of the threaded column.

[0012] Preferably, the cleaning assembly includes a support plate and a lower support frame. The support plate is fixedly connected to one end of the lower inner wall of one of the feed pipes near the center. The lower support frame is fixedly connected to the upper inner wall of the feed pipe at the end away from the support plate. A transmission column is rotatably sleeved on the upper part of the inner center of the support plate via a bearing. Multiple scrapers are fixedly arranged in a ring on the outer side of the transmission column near the positioning disc. The multiple scrapers slide against the side of the positioning disc that is close to each other. A three-section universal joint is rotatably sleeved on the lower part of the inner center of the lower support frame via a bearing. The end of the three-section universal joint away from the lower support frame is fixedly connected to the end of the transmission column away from the multiple scrapers.

[0013] Preferably, the contactless magnetic coupling transmission mechanism includes an outer isolation tube, an upper support frame, and a transmission coupling shaft. The outer isolation tube is fixedly sleeved inside one of the mounting holes. The upper support frame is fixedly connected to the center of the upper end of the feed pipe on the corresponding side. The transmission coupling shaft is fixedly connected to the upper part of the three-section universal joint near the lower support frame. A lower sealing ring is fixedly sleeved at the lower center of the upper support frame, and an inner isolation tube is fixedly sleeved inside the lower sealing ring. The transmission coupling shaft is sleeved inside the inner isolation tube, and the outer wall of the transmission coupling shaft and the inner wall of the inner isolation tube are connected in a contactless manner. An isolation cover is fixedly sleeved at the upper center of the inner isolation tube.

[0014] Preferably, multiple permanent magnets are fixedly embedded in a ring at the center near the edge of the transmission coupling shaft. A synchronous shaft is rotatably sleeved on the upper center of the upper support frame via a bearing. A drive coupling sleeve is fixedly connected to the lower end of the synchronous shaft. The drive coupling sleeve is rotatably sleeved on the outer side of the inner isolation tube and inside the outer isolation tube. The outer wall of the drive coupling sleeve is non-contactly sleeved with the inside of the outer isolation tube, and the inner wall of the drive coupling sleeve is non-contactly sleeved with the outer wall of the isolation cover. Multiple permanent magnets are fixedly embedded in a ring at the center near the edge of the drive coupling sleeve. The multiple permanent magnets and the multiple transmission permanent magnets are magnetically attracted to each other. The upper end of the synchronous shaft is fixedly connected to the lower end of the transmission shaft on the corresponding side.

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

[0016] This bidirectional sealing two-piece knife gate valve achieves an organic combination of high-efficiency sealing and self-cleaning functions in its structural design. During operation, the operating handwheel drives the lead screw to rotate, and the lead screw thread drives the internal thread block, driving the knife gate blocking mechanism to move up and down along the guide bar to achieve the blocking or flow of the medium. The sealing assembly uses a multi-seal structure to dynamically seal the first sealing ring in the sealing cavity and the second sealing ring on the knife gate blocking mechanism to prevent medium leakage and improve reliability. At the same time, the drive mechanism drives the transmission shaft to rotate, which transmits power to the non-contact magnetic coupling transmission mechanism. The drive coupling sleeve rotates to form magnetic coupling, and the transmission permanent magnet drives the transmission coupling shaft to rotate synchronously. This power is transmitted to the transmission column in the cleaning assembly through a three-section universal joint, so that the scraper continuously cleans the surface of the positioning disc, preventing the accumulation of deposits, ensuring smooth opening and closing of the knife gate, significantly extending the equipment's operating cycle and reducing the number of maintenance times. The entire system achieves opening, closing, sealing, and cleaning in one integrated system with a tight transmission relationship, efficient power transmission, and no contact or wear, effectively reducing the problems of deposit adhesion, opening and closing jamming, and difficult maintenance of traditional knife gate valves. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a bidirectional sealing two-piece knife gate valve;

[0018] Figure 2 This is a three-dimensional structural diagram of a bidirectional sealing two-piece knife gate valve from another perspective.

[0019] Figure 3 A three-dimensional disassembled structural diagram of a bidirectional sealing two-piece knife gate valve;

[0020] Figure 4 This is a three-dimensional structural schematic diagram of the non-contact magnetic coupling transmission mechanism of the present invention;

[0021] Figure 5 This is a three-dimensional disassembled structural diagram of the docking component of the present invention;

[0022] Figure 6 This is a three-dimensional disassembled structural diagram of the sealing component of the present invention;

[0023] Figure 7 This is a three-dimensional disassembled structural diagram of the knife gate blocking mechanism of the present invention;

[0024] Figure 8 This is a three-dimensional disassembled structural diagram of the knife gate blocking mechanism of the present invention from another perspective;

[0025] Figure 9 This is a three-dimensional disassembled structural diagram of the driving mechanism of the present invention;

[0026] Figure 10 This is a three-dimensional structural diagram of the cleaning component of the present invention;

[0027] Figure 11 This is a three-dimensional disassembled structural diagram of the cleaning component of the present invention;

[0028] Figure 12 This is a three-dimensional disassembled structural diagram of the non-contact magnetic coupling transmission mechanism of the present invention;

[0029] Figure 13 This is a three-dimensional structural diagram of the internal isolation tube of the present invention.

[0030] In the diagram: 1. Dating assembly; 101. Sealing cavity; 102. Guide strip; 103. Conveyor pipe; 104. Mounting hole; 105. Dating flange ring; 106. Lower lug; 107. Sealing groove; 108. First sealing ring;

[0031] 2. Sealing assembly; 201. Rectangular pressure ring; 202. Sealing cap; 203. Sealing gasket; 204. Sealing tube; 205. Sealing ring; 206. Screw; 207. Upper lug;

[0032] 3. Knife switch blocking mechanism; 301. Internal threaded block; 302. Connecting piece; 303. Connecting plate; 304. Central connecting column; 305. Movable hole; 306. Clamping plate; 307. Positioning disc; 308. Second sealing ring;

[0033] 4. Drive mechanism; 401. Drive shaft; 402. Drive gear; 403. Lower limit plate; 404. Transmission gear; 405. Threaded column; 406. Upper limit plate; 407. Guide rod; 408. Handwheel;

[0034] 5. Cleaning components; 501. Support plate; 502. Lower support frame; 503. Drive column; 504. Scraper; 505. Three-section universal joint;

[0035] 6. Non-contact magnetic coupling transmission mechanism; 601. Outer isolation tube; 602. Upper support frame; 603. Transmission coupling shaft; 604. Lower sealing ring; 605. Inner isolation tube; 606. Isolation cover; 607. Transmission permanent magnet; 608. Synchronous shaft; 609. Drive coupling sleeve; 6010. Drive permanent magnet. Detailed Implementation

[0036] 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.

[0037] Please see Figures 1-4 As shown, the present invention provides a technical solution: a bidirectional sealing two-piece knife gate valve, including a docking assembly 1 for connecting with a pipeline, a sealing assembly 2 for sealing at the upper end of the docking assembly 1, a knife gate blocking mechanism 3 for blocking the internal flow transmission of the docking assembly 1 longitudinally movably disposed inside the docking assembly 1, and cleaning components 5 for cleaning the surface of the knife gate blocking mechanism 3 near both ends of the docking assembly 1 on both sides of the knife gate blocking mechanism 3, a driving mechanism 4 for driving the knife gate blocking mechanism 3 and the two cleaning components 5 to operate at the upper end of the sealing assembly 2, and two contactless magnetic coupling transmission mechanisms 6 for sealing and transmitting kinetic energy and driving the two cleaning components 5 to operate respectively at the center of the outer side of the docking assembly 1 near both ends.

[0038] Furthermore, this bidirectional sealing two-piece knife gate valve achieves an organic combination of high-efficiency sealing and self-cleaning functions in its structural design. During operation, the operating handwheel 408 drives the lead screw 206 to rotate, and the lead screw 206 threadedly drives the internal thread block 301, driving the knife gate blocking mechanism 3 to move up and down along the guide bar 102 to achieve the blocking or flow of the medium. The sealing assembly 2, through a multi-seal structure, works with the first sealing ring 108 in the sealing cavity 101 and the second sealing ring 308 on the knife gate blocking mechanism 3 to achieve dynamic sealing, preventing medium leakage and improving reliability. At the same time, the drive mechanism 4 drives the transmission shaft 401 to rotate, transmitting to the... The contact-type magnetic coupling transmission mechanism 6 drives the coupling sleeve 609 to rotate and form magnetic coupling. The transmission permanent magnet 607 drives the transmission coupling shaft 603 to rotate synchronously. This power is transmitted to the transmission column 503 in the cleaning component 5 through the three-section universal joint 505, so that the scraper 504 continuously cleans the surface of the positioning disc 307, preventing the accumulation of deposits, ensuring smooth opening and closing of the knife gate, significantly extending the equipment operating cycle and reducing the number of maintenance. The entire system realizes the integration of opening, closing, sealing and cleaning. The transmission relationship is tight, the power transmission is efficient and contactless and wear-free, effectively reducing the problems of deposit adhesion, opening and closing jamming and maintenance difficulties of traditional knife gate valves.

[0039] In the preferred embodiment of this technical solution, please refer to Figure 5 As shown, the docking assembly 1 includes a sealing cavity 101. Guide strips 102 are fixedly connected to the center of the two opposing inner walls of the sealing cavity 101. Material conveying pipes 103 are fixedly sleeved on both sides of the inside of the sealing cavity 101. Mounting holes 104 are opened at the upper center of the two material conveying pipes 103. A docking flange ring 105 is fixedly connected to the opposite ends of the two material conveying pipes 103. Lower ear pieces 106 are fixedly connected to the upper center of the two opposing sides of the sealing cavity 101. Sealing grooves 107 are opened at the lower center of the two opposing inner walls of the sealing cavity 101. A first sealing ring 108 is sleeved inside the two sealing grooves 107.

[0040] Furthermore, the docking assembly 1, as the basic component connecting the knife gate valve to the pipeline, provides a closed space for each functional structure in its internal sealing cavity 101. The guide strip 102 is set in the sealing cavity 101, allowing the knife gate blocking mechanism 3 to slide longitudinally along a fixed trajectory during opening and closing, ensuring stable movement and preventing deviation. The feed pipe 103 introduces the medium into the valve cavity and guides it to the downstream of the pipeline. At the same time, the mounting hole 104 provides installation space for the cleaning assembly 5 and the non-contact magnetic coupling transmission mechanism 6. The docking flange ring 105 achieves a tight connection with the pipeline to prevent medium leakage. The lower lug 106 provides installation support for the drive mechanism 4. The first sealing ring 108 set in the sealing groove 107 contacts the second sealing ring 308 on the knife gate blocking mechanism 3 to ensure that the medium does not leak during opening and closing, effectively improving the overall sealing performance.

[0041] In the preferred embodiment of this technical solution, please refer to Figure 6 As shown, the sealing assembly 2 includes a rectangular pressure ring 201, which is installed at the upper end of the sealing cavity 101. A sealing cover 202 is fixedly sleeved at the center of the rectangular pressure ring 201, and a sealing gasket 203 is placed between the rectangular pressure ring 201 and the sealing cavity 101. The rectangular pressure ring 201 and the sealing cavity 101 are fastened together by multiple bolts. A sealing tube 204 is fixedly sleeved at the upper center of the sealing cover 202. A sealing ring 205 is fixedly sleeved at the center of the sealing tube 204. A screw rod 206 is fixedly sleeved inside the sealing ring 205. Upper ear pieces 207 are fixedly connected to the center of each side of the sealing cover 202 that are far apart from each other.

[0042] Furthermore, the sealing assembly 2 forms an upper sealing structure through a rectangular pressure ring 201, a sealing cover 202, a sealing gasket 203, and a sealing tube 204. The screw 206 runs longitudinally through the sealing assembly 2 and is fitted with the sealing tube 204 through a sealing ring 205 to prevent the medium from leaking from the seal when the screw 206 moves. The upper lug 207 provides positioning support for the drive mechanism 4 to ensure stable operation of the transmission system. This sealing structure provides efficient sealing for the drive mechanism 4, preventing medium leakage or impurities from entering, which contributes to the long-term operational stability of the system.

[0043] In the preferred embodiment of this technical solution, please refer to Figures 7-8 As shown, the knife switch blocking mechanism 3 includes an internally threaded block 301, which is threaded onto the outside of the lead screw 206. Connecting pieces 302 are fixedly connected to both sides of the internally threaded block 301 that are far apart from each other. A mating plate 303 is fixedly connected to the lower end of each of the two connecting pieces 302. A central connecting post 304 is fixedly connected at the center between the two mating plates 303. A movable hole 305 for accommodating the lead screw 206 is longitudinally opened through the center of the central connecting post 304. Clamping plates 306 are fixedly connected to the central areas of both sides of the two mating plates 303 that are far apart from each other. Two clamping plates 306 clamp one of the mating plates on one side. Outside the guide strip 102 on one side, two clamping plates 306 are clamped to the outside of the guide strip 102 on the other side. The four clamping plates 306 and the two guide strips 102 are in sliding contact to provide longitudinal sliding guidance. The center of the two mating discs 303 on opposite sides is fixedly connected to a positioning disc 307. The outer sides of the two positioning discs 307 are fixedly fitted with second sealing rings 308. The side of the two second sealing rings 308 that is far apart from each other is in abutting contact with the side of the two first sealing rings 108 that is close to each other. The two second sealing rings 308 and the two first sealing rings 108 are in separable contact.

[0044] Furthermore, the lead screw 206 rotates to drive the threaded internal thread block 301 to rise and fall. The internal thread block 301, in conjunction with the connecting piece 302, the docking plate 303, and the central connecting column 304, enables the overall knife gate blocking mechanism 3 to move up and down, thereby blocking or opening the flow of medium inside the docking assembly 1. The clamping plate 306 ensures accurate movement path through sliding contact with the guide strip 102. The positioning disc 307 cooperates with the second sealing ring 308 to achieve a sealed closure with the first sealing ring 108, ensuring that the medium does not leak from both sides of the gate. The separable contact structure facilitates seal restoration during gate opening and closing, improving seal life.

[0045] In the preferred embodiment of this technical solution, please refer to Figure 9 As shown, the drive mechanism 4 includes two drive shafts 401 and a drive gear 402. The two drive shafts 401 are respectively rotatably connected to the lower ear plate 106 and the upper ear plate 207 on one side and the lower ear plate 106 and the upper ear plate 207 on the other side through bearings. The drive gear 402 is fixedly sleeved on the outer center of the lead screw 206. A lower limit plate 403 is fixedly connected to the upper center of the drive gear 402. A drive gear 404 is fixedly sleeved on the outer center of both drive shafts 401, and the two drive gears 404 and the drive gear 402 are meshed. A threaded column 405 is fixedly connected to the upper center of the lower limit plate 403. An upper limit plate 406 is fixedly connected to the upper end of the threaded column 405. Multiple guide rods 407 are arranged in a ring and fixedly sleeved on the inner center of the drive gear 402 near the edge. A handwheel 408 is longitudinally slidably sleeved on the outer side of the multiple guide rods 407. The inner center of the handwheel 408 is threaded on the outer side of the threaded column 405.

[0046] Furthermore, the rotation of the handwheel 408 drives the threaded column 405 to rotate, and the upper limit plate 406 and the lower limit plate 403 axially limit the lead screw 206. The rotation of the handwheel 408 also causes the drive gear 402 to drive the two transmission gears 404 meshing with it to rotate. The transmission shaft 401 rotates synchronously, transmitting power to the non-contact magnetic coupling transmission mechanism 6. The guide rod 407 ensures that the handwheel 408 remains stable during rotation, avoiding eccentric rotation from affecting control accuracy. This structure realizes synchronous transmission of gate opening and closing and cleaning functions.

[0047] In the preferred embodiment of this technical solution, please refer to Figures 10-11As shown, the cleaning component 5 includes a support plate 501 and a lower support frame 502. The support plate 501 is fixedly connected to one end of the lower inner wall of one of the feed pipes 103 near the center. The lower support frame 502 is fixedly connected to the upper inner wall of the feed pipe 103 at the end away from the support plate 501. A transmission column 503 is rotatably sleeved on the upper part of the inner center of the support plate 501 via a bearing. Multiple scrapers 504 are fixedly connected in a ring on the outer side of the transmission column 503 near the positioning disc 307. The multiple scrapers 504 slide and fit against the side of the positioning disc 307 that is close to each other. A three-section universal joint 505 is rotatably sleeved on the lower part of the inner center of the lower support frame 502 via a bearing. The end of the three-section universal joint 505 away from the lower support frame 502 is fixedly connected to the end of the transmission column 503 away from the multiple scrapers 504.

[0048] Furthermore, driven by the drive shaft 401, the non-contact magnetic coupling transmission mechanism 6 drives the transmission column 503 to rotate. Multiple scrapers 504 on the transmission column 503 adhere to the surface of the positioning disc 307, rotating circumferentially to scrape away deposits adhering to the surface of the knife gate blocking mechanism 3, preventing the gate from thickening due to long-term accumulation. The three-section universal joint 505 transmits rotational power from the transmission coupling shaft 603 to the transmission column 503, ensuring smooth rotation of the scrapers 504, enhancing the cleaning effect, and significantly extending the equipment's trouble-free operating time.

[0049] In the preferred embodiment of this technical solution, please refer to Figures 12-13As shown, the non-contact magnetic coupling transmission mechanism 6 includes an outer isolation tube 601, an upper support frame 602, and a transmission coupling shaft 603. The outer isolation tube 601 is fixedly sleeved inside one of the mounting holes 104. The upper support frame 602 is fixedly connected to the center of the upper end of the feed pipe 103 on the corresponding side. The transmission coupling shaft 603 is fixedly connected to the upper part of the three-section universal joint 505 near the lower support frame 502. A lower sealing ring 604 is fixedly sleeved at the lower center of the upper support frame 602, and an inner isolation tube 605 is fixedly sleeved inside the lower sealing ring 604. The transmission coupling shaft 603 is sleeved inside the inner isolation tube 605, and the outer wall of the transmission coupling shaft 603 and the inner wall of the inner isolation tube 605 are non-contact sleeved together. An isolation cover 606 is fixedly sleeved at the upper center of the inner isolation tube 605. Multiple drive permanent magnets 607 are fixedly embedded in a ring at the center of the inner shaft 603 near the edge. A synchronous shaft 608 is rotatably sleeved on the upper center of the upper support frame 602 via a bearing. A drive coupling sleeve 609 is fixedly connected to the lower end of the synchronous shaft 608. The drive coupling sleeve 609 is rotatably sleeved inside the outer isolation tube 601 outside the inner isolation tube 605. The outer wall of the drive coupling sleeve 609 is non-contactly sleeved with the inside of the outer isolation tube 601. The inner wall of the drive coupling sleeve 609 is non-contactly sleeved with the outer wall of the isolation cover 606. Multiple drive permanent magnets 6010 are fixedly embedded in a ring at the center of the inner shaft 609 near the edge. The multiple drive permanent magnets 6010 and the multiple drive permanent magnets 607 are magnetically attracted to each other. The upper end of the synchronous shaft 608 is fixedly connected to the lower end of the drive shaft 401 on the corresponding side.

[0050] Furthermore, the rotation of the drive shaft 401 drives the synchronous shaft 608 to rotate, and the synchronous shaft 608 drives the coupling sleeve 609 to rotate. Multiple driving permanent magnets 6010 form a rotating magnetic field that acts on the transmission permanent magnet 607. The transmission permanent magnet 607 drives the transmission coupling shaft 603 to rotate. The rotational power is transmitted to the transmission column 503 through the three-section universal joint 505, realizing the rotation of the scraper 504 of the cleaning component 5. The inner isolation tube 605 and the transmission coupling shaft 603, as well as the drive coupling sleeve 609 and the outer isolation tube 601, are connected in a non-contact manner, ensuring no wear and no leakage during power transmission, and improving the operating efficiency and stability of the cleaning component 5.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bi-directional seal two-piece knife gate valve, characterized by: The utility model provides a sealing assembly (2) is provided on the upper end of the docking assembly (1) for sealing, a knife-gate blocking mechanism (3) is movably arranged longitudinally in the docking assembly (1), the two sides of the knife-gate blocking mechanism (3) are provided with cleaning assemblies (5) for cleaning the surface attachments of the knife-gate blocking mechanism (3) at the two ends of the docking assembly (1), a driving mechanism (4) is provided on the upper end of the sealing assembly (2) for driving the operation of the knife-gate blocking mechanism (3) and the two cleaning assemblies (5), and two non-contact magnetic coupling transmission mechanisms (6) are provided on the outer side of the docking assembly (1) at the two ends for sealing kinetic energy transmission and driving the operation of the two cleaning assemblies (5) respectively. The docking assembly (1) comprises a sealing cavity (101), the two inner walls of the sealing cavity (101) are fixedly connected with guide strips (102) at the centers of the two inner walls, and the two sides of the sealing cavity (101) are fixedly provided with material conveying pipes (103). The sealing assembly (2) comprises a rectangular compression ring (201), the rectangular compression ring (201) is arranged on the upper end of the sealing cavity (101), a sealing cover (202) is fixedly provided in the center of the rectangular compression ring (201), a sealing gasket (203) is arranged between the rectangular compression ring (201) and the sealing cavity (101), the rectangular compression ring (201) and the sealing cavity (101) are fixedly connected by a plurality of bolts, a sealing pipe (204) is fixedly provided in the upper center of the sealing cover (202), a sealing rotating ring (205) is fixedly provided in the center of the sealing pipe (204), a lead screw (206) is fixedly provided in the sealing rotating ring (205), and upper lugs (207) are fixedly connected to the centers of the sides of the sealing cover (202) away from each other. The non-contact magnetic coupling transmission mechanism (6) comprises an outer isolation pipe (601), an upper support frame (602) and a transmission coupling shaft (603), the outer isolation pipe (601) is fixedly provided in one of the installation holes (104), the upper support frame (602) is fixedly connected to the upper end center of the material conveying pipe (103) on the corresponding side, the transmission coupling shaft (603) is fixedly connected to the upper part of the end of the three-section universal joint (505) close to the lower support frame (502), a lower sealing ring (604) is fixedly provided in the lower center of the upper support frame (602), an inner isolation pipe (605) is fixedly provided in the lower sealing ring (604), the transmission coupling shaft (603) is provided in the inner isolation pipe (605), and the transmission coupling shaft (603) and the inner isolation pipe (605) are non-contact sleeved, and an isolation cover (606) is fixedly provided in the upper center of the inner isolation pipe (605).

2. A bi-directional seal double-disc gate valve according to claim 1, characterized in that: Two said feed pipe (103) outside each other away from the end of the fixed connection with the flange ring (105) butt, the sealing cavity (101) principle of the two sides of the center on the upper part of the fixed connection with the lower ear (106), the sealing cavity (101) opposite two inner wall center on the lower part of the sealing groove (107) are set up, and two said sealing groove (107) inside are set with the first sealing ring (108).

3. A bi-directional seal double-disc gate valve according to claim 2, characterized in that: The knife switch blocking mechanism (3) includes an inner threaded block (301), the inner threaded block (301) is threadedly connected outside the lead screw (206), and the inner threaded block (301) is fixedly connected with the connecting plate (302) on the two sides away from each other, the lower end of the two connecting plates (302) is fixedly connected with the butt disc (303), the center of the two butt discs (303) is fixedly connected with the middle connecting column (304), and the movable hole (305) for accommodating the lead screw (206) is longitudinally provided in the inner center of the middle connecting column (304), and the two butt discs (303) are fixedly connected with the clamping plate (306) in the middle region of the two sides away from each other.

4. A double seal, two-piece knife gate valve as claimed in claim 3, characterized in that: The two clamping plates (306) on one side are clamped outside the guide strip (102) on one side, the two clamping plates (306) on the other side are clamped outside the guide strip (102) on the other side, the sliding contact between the four clamping plates (306) and the two guide strips (102) plays a longitudinal sliding guiding role, the two butt discs (303) are fixedly connected with the positioning disc (307) on the two sides away from each other, the second sealing ring (308) is fixedly sleeved outside the two positioning discs (307), the side away from each other of the two second sealing rings (308) is in abutting contact with the side close to each other of the two first sealing rings (108), and the two second sealing rings (308) and the two first sealing rings (108) are in separable contact.

5. A bi-directional seal double-disc gate valve according to claim 1, characterized in that: The driving mechanism (4) includes two transmission shafts (401) and a drive gear (402), both of the transmission shafts (401) are rotatably sleeved at the inner sides of the lower and upper grommets (106 and 207) on one side and the inner sides of the lower and upper grommets (106 and 207) on the other side through bearings, the drive gear (402) is fixedly sleeved at the outer side center of the upper part of the lead screw (206), the lower limit piece (403) is fixedly connected to the upper end center of the drive gear (402), the transmission gears (404) are fixedly sleeved at the outer side center of the upper part of both of the transmission shafts (401), gear meshing transmission is formed between the two transmission gears (404) and the drive gear (402), the threaded column (405) is fixedly connected to the upper end center of the lower limit piece (403), the upper limit piece (406) is fixedly connected to the upper end of the threaded column (405), the plurality of guide rods (407) are fixedly sleeved in the inner side center of the edge of the drive gear (402) in an annular arrangement, the hand wheel (408) is sleeved on the outer side of the plurality of guide rods (407) in a longitudinal sliding manner, and the inner side center of the hand wheel (408) is threadedly sleeved on the outer side of the threaded column (405).

6. A bi-directional seal double-disc gate valve according to claim 1, characterized in that: The cleaning assembly (5) includes a support piece (501) and a lower support frame (502), the support piece (501) is fixedly connected to the inner wall center of one of the material conveying pipes (103) on one end, the lower support frame (502) is fixedly connected to the inner wall center of the material conveying pipe (103) on the end away from the support piece (501), the transmission column (503) is rotatably sleeved to the inner side center of the upper part of the support piece (501) through a bearing, the plurality of scrapers (504) are fixedly connected to the outer side of the transmission column (503) near the one end of the positioning disc (307) in an annular arrangement, the plurality of scrapers (504) and the positioning disc (307) slide and fit on the side close to each other, the three-section universal joint (505) is rotatably sleeved to the inner side center of the lower part of the lower support frame (502) through a bearing, and the three-section universal joint (505) is fixedly connected to the one end of the transmission column (503) away from the plurality of scrapers (504).

7. A bi-directional seal double-disc gate valve according to claim 1, characterized in that: The drive coupling shaft (603) is internally and peripherally arranged and fixed with a plurality of drive permanent magnets (607), the upper support frame (602) is internally and peripherally arranged and fixed with a synchronous shaft (608) through a bearing, the lower end of the synchronous shaft (608) is fixedly connected with a drive coupling sleeve (609), the drive coupling sleeve (609) is rotatably sleeved outside the inner isolation pipe (605) and inside the outer isolation pipe (601), the outer wall of the drive coupling sleeve (609) and the inner wall of the outer isolation pipe (601) are non-contact sleeved, the inner wall of the drive coupling sleeve (609) and the outer wall of the isolation cover (606) are non-contact sleeved, a plurality of drive permanent magnets (6010) are arranged and fixed in the inner center of the drive coupling sleeve (609) and peripherally, the drive permanent magnets (6010) and the drive permanent magnets (607) are magnetically attracted, and the upper end of the synchronous shaft (608) is fixedly connected with the lower end of the corresponding transmission shaft (401).

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