Hydraulic combined type pulp penetrating knife gate valve

Abstract

The invention relates to the technical field of knife gate valves, and particularly discloses a hydraulic combined type pulp penetrating knife gate valve which comprises a valve body, a valve plate and two valve seats, each valve seat is provided with a sealing mechanism and a cleaning mechanism, each sealing mechanism comprises a pressing ring and a sealing piece, the pressing rings can slide in the axial direction of a medium flow channel, and the sealing pieces are arranged on the valve plates. The cleaning mechanism comprises a first movable block, a second movable block, a tensioning assembly, a washing assembly and a pressing ring, the sides, facing the valve plate, of the first movable block and the second movable block form a working face and cover the sealing piece, and the tensioning assembly can pull the sealing piece to conduct tensioning when the first movable block or the second movable block is away from the valve plate. The washing assembly sprays water to the tensioning part of the sealing piece to achieve washing cleaning. Through linkage of slag scraping of the valve plate and self-cleaning of the sealing piece, the problems that the sealing piece of a traditional knife gate valve is prone to abrasion, and a slag scraping structure is prone to failure are solved, the service life is remarkably prolonged, and the sealing reliability is improved.

Description

Technical Field

[0001] This invention relates to the field of knife gate valve technology, and specifically to a hydraulically combined penetrating slurry knife gate valve. Background Technology

[0002] Slurry gate valves are core control devices in slurry transport pipelines in mining, metallurgy, and tailings treatment industries. Their main function is to control the flow of slurry media. Currently, most slurry gate valves on the market employ a knife-shaped gate combined with an elastic sealing ring. The gate's movement direction is perpendicular to the fluid direction, cutting off the slurry media through the blade-shaped gate, and sealing is achieved through the contact between the sealing ring and the gate. However, in actual use, silt and particulate matter in the slurry easily adhere to the gate surface. During the reciprocating movement of the gate, these impurities directly scrape the sealing ring. Long-term use can lead to scratches, thinning, and even seal failure of the sealing ring, significantly reducing the valve's sealing reliability. Chinese patent document CN223049443U discloses a self-cleaning slurry gate valve, including a valve body, a valve plate, a valve stem, and a drive mechanism. The valve body has a medium flow channel, and the valve plate is inserted into the medium flow channel. A valve seat assembly is provided in the medium flow channel, and the valve seat assembly includes an elastic sealing ring and an elastic annular scraper. When the valve plate moves up and down, the elastic annular scraper can scrape off mud, sand, particles, etc., adhering to the surface of the valve plate, keeping the valve plate clean and extending the service life of the valve.

[0003] While the aforementioned self-cleaning slurry gate valve alleviates the problem of seal wear to some extent, the elastic annular scraper in this structure lacks self-cleaning capability. After long-term use, a large amount of slurry impurities will accumulate on the scraper surface, significantly reducing the scraping effect. This causes the gate to carry impurities to the non-scraping area of ​​the valve seat during gate movement, resulting in slag buildup and blockage inside the valve seat. This fails to fundamentally solve the technical problems of easy seal failure, short scraping structure life, and inconvenient maintenance in slurry gate valves. Summary of the Invention

[0004] This invention provides a hydraulically combined penetrating slurry gate valve, which aims to solve the problems of impurities easily getting trapped in the seals of slurry gate valves in related technologies, leading to rapid wear and incomplete cleaning.

[0005] A hydraulic combined penetrating slurry knife gate valve includes a valve body, a valve plate and two valve seats. The valve body has a medium flow channel, and each valve seat is equipped with a sealing mechanism and a cleaning mechanism. The sealing mechanism includes a clamping ring and a sealing element. The clamping ring is slidably mounted on the valve seat along the axial direction of the medium flow channel. The sealing element is located on the side of the clamping ring facing the valve plate. The clamping ring can move towards the valve plate and press the sealing element against the valve plate to achieve a seal. The cleaning mechanism includes movable block one, movable block two, a tensioning assembly, and a flushing assembly. Movable block one and movable block two are respectively a semi-circular ring located at the upper part and a semi-circular ring located at the lower part. They are slidably installed on the valve seat along the axial direction of the medium flow channel and cooperate to form a ring structure. The outer circumference of the ring structure slides and fits against the inner circumference of the pressure ring. The pressure ring, movable block one, and movable block two together form a working surface facing the valve plate. The seal covers the working surface. The tensioning assembly is connected to the end of the seal. When movable block one or movable block two moves away from the valve plate, the tensioning assembly can pull the seal to put it in a tensioned state. The flushing assembly has a water outlet end facing the seal, which is used to flush and clean the seal when it is in a tensioned state.

[0006] Its effects are as follows: By integrating the sealing and cleaning mechanisms on the valve seat, the sealing and self-cleaning functions of the slurry gate valve are coordinated. The clamping ring slides axially along the medium flow channel, which can precisely press the seal against the valve plate to achieve a reliable seal; the composite working surface formed by the clamping ring, movable block one, and movable block two provides full-circumferential, high-rigidity physical support for the seal, ensuring the stability of the seal; by utilizing the displacement difference formed by the retraction of movable block one and movable block two, the tensioning component tensions the seal, thereby completely exposing the deep slurry impurities attached to the surface of the seal, and achieving deep cleaning in conjunction with the flushing component, effectively preventing the accumulation of slurry impurities that may obstruct the valve plate, solving the problems of easy wear of the seals and lack of self-cleaning ability of the scraping structure in traditional slurry gate valves, and improving the valve's adaptability and service life under slurry conditions.

[0007] Preferably, when the valve plate moves downward to close the medium flow channel, movable block two moves towards the valve plate, using its front sealing element to scrape away the slurry on the valve plate surface. Simultaneously, movable block one moves away from the valve plate, using the tensioning and flushing components to clean the sealing element at its front end. When the valve plate moves upward to open the medium flow channel, movable block one moves towards the valve plate, using its front sealing element to scrape away the slurry on the valve plate surface. Simultaneously, movable block two moves away from the valve plate, using the tensioning and flushing components to clean the sealing element at its front end. The effect is that, through the reverse linkage of movable blocks one and two during the valve plate's opening and closing process, and the coordinated scraping and cleaning, when the valve plate moves downward to close, movable block two is pressed against the slurry for scraping, while movable block one moves away for cleaning; when it moves upward to open, the reverse action is performed, achieving real-time protection of the sealing surface throughout the entire cycle.

[0008] Preferably, the sealing mechanism further includes a drive structure for driving the clamping ring to move axially. The drive structure includes an annular hydraulic chamber located within the valve seat. The end of the clamping ring furthest from the sealing element is slidably sealed within the annular hydraulic chamber. By filling the annular hydraulic chamber with hydraulic medium to generate axial thrust, the clamping ring can be driven to move closer to the valve plate, thereby pressing the sealing element against the valve plate surface to achieve a seal. The advantage is that the annular hydraulic chamber forms the hydraulic drive structure for driving the clamping ring. Utilizing the axial thrust of the hydraulic medium to drive the clamping ring, compared to traditional mechanical drives, the hydraulic thrust is greater and more uniform, allowing the clamping ring to evenly press the sealing element against the valve plate, ensuring consistent circumferential pressure on the sealing surface, eliminating pressure dead zones, and improving sealing reliability.

[0009] Preferably, the cleaning mechanism further includes a second drive structure for driving the first movable block and the second movable block to move axially. The second drive structure includes an annular hydraulic chamber two opened in the valve seat, and a linkage pipe connecting the first movable block and the second movable block. The end of the first movable block away from the seal is slidably sealed in the annular hydraulic chamber two. By filling or discharging hydraulic medium into the annular hydraulic chamber two, the first movable block can be driven to move axially. The linkage pipe is filled with incompressible hydraulic medium so as to drive the second movable block to move axially in the opposite direction to the first movable block through the volume displacement difference.

[0010] Preferably, the tensioning assembly is provided in multiple groups, which are evenly distributed in the valve seat along the circumference. Each tensioning assembly includes a drive source, a screw, and a slider. The screw is rotatably installed in the valve seat along the axial direction of the medium flow channel, and the drive source is connected to the screw and used to drive its rotation. The slider is threadedly connected to the screw and is connected to the corresponding end of the seal. When the slider moves away from the valve plate, it can pull the seal to make a feed displacement.

[0011] Preferably, the seal is a segmented structure that covers the working surface and is movable. The seal includes a new segment, a sealing segment, a scraping segment, and an old segment distributed sequentially along its feed path. When the seal is moved by the movement of the slider, it can be guided to bypass the clamping ring and the front ends of movable blocks one and two for segment replacement. This moves the unused new segment to the front end of the clamping ring to become a sealing segment, and moves the original sealing segment to the front end of movable blocks one and two to become a scraping segment. The effect is that by setting the seal as a segmented movable structure with new, sealing, scraping, and old segments, and realizing the segment replacement of the seal through the movement of the slider, the unused new segment is always used as a sealing segment to ensure the sealing effect, and the worn sealing segment is converted into a scraping segment for continued use. This achieves segmented cyclic use of the seal, significantly extending the overall service life of the seal and reducing the replacement frequency of the seal.

[0012] Preferably, the flushing assembly includes multiple water flow channels formed in the valve seat. The multiple water flow channels are evenly distributed along the circumference of the valve seat. The inlet end of the water flow channel is connected to the water supply source, and the outlet end faces the front end of movable block one or movable block two. When movable block one or movable block two moves into place away from the valve plate, the movement of the slider pulls the seal to a tensioned state. Then, the water flow channel sprays water onto the tensioned part of the seal to flush away the residual slurry on the surface of the seal.

[0013] Preferably, the sealing element is made of elastic rubber, and the working surface formed by the clamping ring, movable block one, and movable block two is adapted to the shape of the valve plate. This ensures that when the sealing element covering the working surface is pressed against the valve plate, it can form a uniformly pressured sealing contact surface with the valve plate in the circumferential direction. The effect is that the working surface's adaptation to the valve plate guarantees surface contact between the sealing element and the valve plate, uniform circumferential pressure, no localized wear, and further improves sealing reliability and the service life of the sealing element.

[0014] Preferably, the ends of the clamping ring, movable block one, and movable block two facing the valve plate are all provided with arc-shaped guide surfaces for supporting the seal. The seal wraps around and fits against the arc-shaped guide surfaces. The effect is that the arc-shaped guide surfaces allow the seal to wrap around and fit evenly, avoiding stress concentration at the corners and preventing cracks caused by excessive local stress. Simultaneously, the guide surfaces guide the movement of the seal, making the sliding of the seal smoother during section changes and slag scraping, reducing friction and wear.

[0015] Preferably, the bottom of the valve plate has a wedge-shaped cutting edge structure with the tip of the cutting edge structure facing downward, for cutting off the slurry in the medium flow channel when the valve plate moves downward.

[0016] By adopting the above technical solution, the beneficial effects of the present invention are as follows: 1. The present invention is equipped with a sealing mechanism, which uses a hydraulically driven clamping ring to press the sealing element against the surface of the valve plate. With the cooperation of the working surface and the arc-shaped guide surface adapted to the valve plate surface, the sealing element and the valve plate form a circumferential pressure uniform surface contact seal, without pressure dead angles or fitting gaps, to achieve reliable sealing under high pressure slurry conditions, and solve the problems of poor sealing and easy leakage in traditional knife gate valves.

[0017] 2. The present invention is equipped with a cleaning mechanism. By utilizing the displacement difference formed by the movement of movable block one or movable block two away from the valve plate, the tensioning component forcibly stretches the seal to a tensioned state, exposing the deep mineral slurry impurities attached to the surface of the seal. Then, the circumferentially distributed flushing component sprays high-pressure water to remove the residual impurities, thereby achieving deep cleaning of the seal. This solves the problem that the traditional slag scraping structure can only clean surface impurities, and deep impurities are prone to accumulating and clumping, thus improving the valve opening and closing stability.

[0018] 3. The present invention is equipped with a segmented movable sealing element and multiple sets of circumferentially distributed tensioning components. The sealing element can be replaced by moving the slider, so that the unused new segment can always be used as a sealing segment to ensure sealing reliability. The worn sealing segment is converted into a scraping segment to continue to play a role, realizing the segmented recycling of the sealing element, extending the overall service life of the sealing element, and reducing the replacement frequency and consumable costs. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the present invention cut along its longitudinal direction.

[0021] Figure 3 This is a schematic diagram of the sealing mechanism and cleaning mechanism of the present invention.

[0022] Figure 4 For the present invention Figure 3 A magnified structural diagram of point A in the middle.

[0023] Figure 5 For the present invention Figure 3 A magnified structural diagram at point B in the middle.

[0024] Figure 6 This is a schematic diagram of the assembly structure of the movable block and the sealing mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the assembly structure of the movable block 2 and the sealing mechanism of the present invention.

[0026] Figure 8 This is a schematic diagram of the assembly structure of movable block one and movable block two of the present invention.

[0027] Figure label: 11. Valve body; 12. Valve plate; 13. Valve seat; 131. Annular hydraulic chamber one; 132. Annular hydraulic chamber two; 133. Water flow channel; 2. Pressure ring; 3. Seal; 4. Movable block one; 5. Movable block two; 6. Linkage pipe; 71. Screw; 72. Slider. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] like Figures 1-8As shown, a hydraulically combined penetrating slurry gate valve includes a valve body 11, a valve plate 12, and two valve seats 13 symmetrically arranged within the valve body 11. Each valve seat 13 is equipped with a sealing mechanism and a cleaning mechanism. The sealing mechanism is used to achieve a seal between the valve plate 12 and the valve seat 13, preventing slurry leakage from the gap between the valve plate 12 and the valve seat 13. The cleaning mechanism is used to scrape off slurry impurities from the surface of the valve plate 12 and perform self-cleaning treatment, solving the problems of easy wear of the sealing structure, lack of self-cleaning of the scraping structure, and easy accumulation and blockage of impurities in the slurry gate valve.

[0030] like Figure 1 and Figure 2 As shown, the valve body 11, serving as the load-bearing structure and the foundation for media flow in the entire valve, is integrally cast from cast steel or stainless steel. The valve body 11 has a horizontally continuous media flow channel inside, and the inner wall of the channel is treated with anti-corrosion and wear-resistant materials to effectively resist the erosion and wear of solid particles in the slurry media, thus extending the service life of the valve body 11.

[0031] like Figure 1 and Figure 2 As shown, the valve plate 12 is located in the middle of the valve body 11 and can move back and forth linearly in a direction perpendicular to the medium flow channel. The upward and downward movement of the valve plate 12 is driven by an external hydraulic cylinder, which is fixed to the top of the valve body 11. The push rod of the hydraulic cylinder is fixedly connected to the top of the valve plate 12. The extension and retraction of the hydraulic cylinder drives the valve plate 12 to move up and down, thereby opening and closing the medium flow channel. The bottom of the valve plate 12 is integrally formed with a wedge-shaped cutting edge structure, with the tip of the cutting edge structure facing downward. When the valve plate 12 moves downward to close the medium flow channel, the cutting edge structure can first cut off fibrous impurities, agglomerated impurities, and large particle agglomerates in the slurry, preventing impurities from getting stuck between the valve plate 12 and the valve seat 13, causing the valve plate 12 to jam or the seal 3 to be hard-scraped, thus ensuring the smooth opening and closing of the valve.

[0032] like Figure 1 and Figure 2 As shown, two valve seats 13 are symmetrically fixed in the medium flow channel and are located on the left and right sides of the valve plate 12, respectively. The valve seats 13 are fastened to the valve body 11 with bolts and sealed with sealing rings to prevent the slurry medium from leaking from the mating gap between the valve seats 13 and the valve body 11. The valve seat 13 has a mounting cavity on the side facing the valve plate 12. The outline of the mounting cavity is adapted to the shape of the sealing mechanism and the cleaning mechanism, providing installation and movement space for each component.

[0033] like Figures 3-7As shown, the sealing mechanism includes a clamping ring 2, a sealing element 3, and a drive structure. The clamping ring 2 is an annular structure that slides axially within the mounting cavity of the valve seat 13 along the medium flow channel with a high-precision fit clearance. The sealing element 3 is located on the side of the clamping ring 2 facing the valve plate 12. The sealing element 3 is an integral annular band made of rubber, possessing good elasticity, wear resistance, and oil resistance. The drive structure is an annular hydraulic chamber 131 located within the valve seat 13. The annular hydraulic chamber 131 is an annular cavity structure connected to an external hydraulic station via hydraulic pipelines. Hydraulic control valves and pressure sensors are installed on the hydraulic pipelines to control the filling, draining, and pressure monitoring of the annular hydraulic chamber 131. The end of the clamping ring 2 furthest from the sealing element 3 is slidably sealed within the annular hydraulic chamber 131.

[0034] When a seal is required, the external hydraulic station fills the annular hydraulic chamber 131 with hydraulic oil. The pressure of the hydraulic oil generates an axial thrust, which drives the clamping ring 2 to move closer to the valve plate 12. The clamping ring 2 pushes the sealing element 3 to fit tightly against the surface of the valve plate 12. Under the action of the extrusion force, the sealing element 3 undergoes elastic deformation, forming a gapless sealing contact surface with the surface of the valve plate 12, thereby achieving a reliable seal between the valve plate 12 and the valve seat 13 and preventing the slurry from leaking out of the gap.

[0035] like Figures 3-8 As shown, the cleaning mechanism includes movable block 4, movable block 5, and drive structure 2. Movable block 4 is a semi-circular ring structure located at the upper part of the valve seat 13 mounting cavity, and movable block 5 is a semi-circular ring structure located at the lower part of the valve seat 13 mounting cavity. The two are slidably installed in the mounting cavity of the valve seat 13 along the axial direction of the medium flow channel and can cooperate to form a ring structure. The outer circumference of the ring structure slides and fits against the inner circumference of the outer pressing ring 2. At this time, the end face of the pressing ring 2 facing the valve plate 12, together with the end faces of movable block 4 and movable block 5 facing the valve plate 12, forms a working surface for sealing. This working surface is adapted to the plate surface of the valve plate 12. The sealing element 3 wraps around and fits against this working surface, ensuring that the sealing element 3 forms surface contact with the valve plate 12, and the circumferential pressure is uniform, further improving the sealing reliability.

[0036] In addition, the ends of the clamping ring 2 and the movable blocks 4 and 5 are all machined with arc-shaped guide surfaces. These arc-shaped guide surfaces allow the seal 3 to fit evenly, avoiding stress concentration at the corners of the seal 3 and preventing cracks caused by excessive local stress. At the same time, these arc-shaped guide surfaces guide the movement of the seal 3, making the sliding of the seal 3 smoother during subsequent section replacement and slag scraping, reducing friction and wear, and extending the service life of the seal 3.

[0037] like Figures 4-8As shown, the second drive structure includes an annular hydraulic chamber 132 and a linkage pipe 6 connecting the movable block 4 and the movable block 5. The annular hydraulic chamber 132 is located in the upper part of the mounting cavity of the valve seat 13 and is connected to an external hydraulic station via a hydraulic pipeline. The hydraulic pipeline is equipped with a hydraulic control valve and a pressure sensor for controlling the filling, draining, and pressure monitoring of the annular hydraulic chamber 132. The end of the movable block 4 furthest from the valve plate 12 is slidably sealed within the annular hydraulic chamber 132. The linkage pipe 6 is pre-filled with incompressible hydraulic oil, and its two ends are slidably sealed to the movable block 4 and the movable block 5, respectively. This allows the movement of the movable block 4 to create a volumetric displacement difference, driving the movable block 5 to move in the opposite direction.

[0038] To ensure that the displacement and thrust of movable block 1 4 and movable block 2 5 are synchronized in axial movement, the effective hydraulic action area of ​​movable block 1 4 and movable block 2 5 is the same. The connection between the linkage pipe 6 and movable block 1 4 and movable block 2 5 adopts a combined sealing structure, such as O-rings and Glyd rings, to effectively prevent hydraulic oil leakage. In order to improve the stability of reverse linkage, multiple linkage pipes 6 can be evenly distributed around the valve seat 13.

[0039] Specifically, when the valve plate 12 moves upward to open the medium flow channel, hydraulic oil is injected into the annular hydraulic chamber 132, driving the movable block 4 to move axially towards the valve plate 12. At this time, the sealing element 3 at the front end of the movable block 4 can scrape away slurry impurities on the surface of the valve plate 12 in real time, preventing impurities from entering the sealing surface. During the upward and downward movement of the valve plate 12, the hydraulic clamping force of the clamping ring 2 is relatively small. The up and down movement of the valve plate 12 will squeeze the clamping ring 2 to both sides, ensuring that while the valve plate 12 can move, the sealing element 3 at the front end of the clamping ring 2 can also contact the side of the valve plate 12 to maintain a seal. After the valve plate 12 moves downward to close, the clamping rings 2 on both sides further press the sealing element 3 onto the valve plate 12 under the hydraulic action of the drive structure. After the valve plate 12 moves upward to open, the clamping rings 2 on both sides further approach each other under the hydraulic action of the drive structure until the sealing elements 3 at the front ends of the two clamping rings 2 are pressed together, maintaining the seal of the medium flow channel. At the same time, movable block 2 5 retracts away from valve plate 12 under the linkage. At this time, the seal 3 at the front end of movable block 2 5, which is in the retracted state, is released, creating space for subsequent self-cleaning. Similarly, when valve plate 12 moves downward to close the medium flow channel, movable block 2 5 moves forward to scrape off impurities, while movable block 1 4 retracts to perform self-cleaning.

[0040] like Figures 3-7As shown, the cleaning mechanism also includes a tensioning assembly and a flushing assembly. Multiple tensioning assemblies are set up and evenly distributed along the circumference of the valve seat 13 within its mounting cavity. The number of assemblies can be designed to be 6 to 12 depending on the valve diameter. For example, three assemblies are installed in the corresponding area of ​​the upper movable block 4, and three assemblies are also installed in the corresponding area of ​​the lower movable block 5. Each tensioning assembly includes a drive source, a screw 71, and a slider 72. The drive source can be a motor, fixedly mounted on the outside of the valve seat 13. The screw 71 is rotatably mounted within the mounting cavity of the valve seat 13 along the axial direction of the medium flow channel. One end of the screw 71 is connected to the output shaft of the motor, allowing the motor to drive the screw 71 to rotate around its own axis. The slider 72 is threaded onto the screw 71, and the slider 72 is fixedly connected to the end of the seal 3 via a snap-fit ​​structure, ensuring reliable connection and easy disassembly.

[0041] The flushing assembly includes multiple water flow channels 133 formed within the valve seat 13, which are evenly distributed circumferentially along the valve seat 13. The inlet ends of these water flow channels 133 are connected to an external water supply source via a water supply pipeline, and the outlet ends face the front end of movable block 4 or movable block 5.

[0042] Specifically, when the movable block 4 moves away from the valve plate 12, the seal 3 located at the front end of the movable block 4 separates from the movable block 4 and is in a relaxed state. At this time, the screw 71 in the area corresponding to the movable block 4 is driven by the motor to start rotating, and the slider 72 moves a short distance away from the valve plate 12, thereby pulling the seal 3 located at the front end of the movable block 4, causing the seal 3 to switch from a relaxed state to a tensioned state. Then, the flushing assembly starts to work. The high-pressure water flow provided by the external water supply source is sprayed onto the tensioned part of the seal 3 through the water flow channel 133. The impact force of the high-pressure water flow can wash away the mineral slurry impurities attached to the surface of the seal 3, realizing the self-cleaning of the seal 3.

[0043] By pulling the seal 3 to a tensioned state, a more thorough flushing and cleaning can be achieved. Specifically, the tensioned state flattens the seal 3, eliminating wrinkles on its surface and areas of tight contact with the support surface. This allows embedded mineral slurry impurities to be fully exposed to the flushing range of the high-pressure water flow, avoiding cleaning dead zones. The surface tension generated after the seal 3 is tensioned significantly reduces the adhesion between impurities and the rubber surface. Combined with the impact force of the high-pressure water flow, impurities can be flushed away more easily. The tensioned state also prevents the seal 3 from shaking under the water flow, ensuring the accuracy of the flushing position and preventing the water flow from washing away other components, thereby improving the flushing effect.

[0044] like Figures 4-7As shown, the seal 3 is a segmented movable structure, divided into four sections along its feed path: a new section, a sealing section, a scraping section, and an old section. The unused new section is stored in the empty compartment reserved between the valve body 11 and the valve seat 13; the sealing section is attached to the front end of the clamping ring 2 to press against the surface of the valve plate 12 for sealing; the scraping section is located at the front end of the movable block 4 and the movable block 5 to scrape off slurry impurities from the surface of the valve plate 12; the old section bypasses the bottom of the movable block 4 and the movable block 5 and folds back into the mounting cavity of the valve seat 13, connecting with the slider 72.

[0045] The sealing element 3 is an integral elastic rubber ring-shaped belt with a closed-loop structure. The new section, sealing section, scraping section, and old section are continuous functional areas. The storage structure for the new section includes a storage roller and a guide roller installed in the empty compartment between the valve body 11 and the valve seat 13. Both are rotatable, wear-resistant rollers. The new section of the sealing element 3 is wound around the storage roller to achieve tension-free storage. The storage roller can rotate freely according to the pulling amount of the sealing element 3 to release the new section. After being released from the storage roller, the new section passes through multiple sets of guide rollers in the empty compartment. The direction of the guide rollers is consistent with the feeding path of the sealing element 3, guiding the new section to extend along the arc-shaped guide surface to the front end of the clamping ring 2 to form the sealing section.

[0046] When the sealing section shows slight wear, the motor is started, which drives the slider 72 to move a long distance and pulls the seal 3 to move as a whole. During this process, the arc-shaped guide surface can be used as a "pulley" to feed the seal 3 on the U-shaped path. The unused new section is moved to the front end of the clamping ring 2 and converted into a new sealing section, while the original sealing section is moved to the front end of the movable block 1 4 and movable block 2 5 and converted into a new scraping section. The original scraping section is moved to the old section area, realizing the segmented recycling of the seal 3, which greatly extends the overall service life of the seal 3 and reduces the replacement frequency.

[0047] Based on the above-described device, the working process and working principle of the present invention are as follows: When it is necessary to close the medium flow channel, the push rod of the hydraulic cylinder extends downward, driving the valve plate 12 downward. The cutting edge structure at the bottom of the valve plate 12 first contacts the slurry medium, cutting off fibrous impurities, agglomerated impurities, and large particle agglomerates. At the same time, the hydraulic station discharges the hydraulic oil from the annular hydraulic chamber 132, and the movable block 4 moves away from the valve plate 12. Through the linkage of the linkage pipe 6, it drives the movable block 5 to move closer to the valve plate 12. The movable block 5 stops after moving to the position where it is in contact with the surface of the valve plate 12. The valve plate 12 continues to move downward, and the scraping section of the sealing element 3 at the front end of the movable block 5 is in close contact with the surface of the valve plate 12, scraping off the slurry impurities attached to the surface of the valve plate 12 and preventing impurities from being carried to the lower part of the valve seat 13. Furthermore, as the movable block 4 moves away from the valve plate 12, the drive source in this area is activated, driving the screw 71 to rotate. This causes the slider 72 to pull the scraping section of the seal 3 at the front end of the movable block 4 into a tensioned state. Subsequently, an external water supply source sprays high-pressure water into the tensioned part of the seal 3 through the water flow channel 133, washing away the slurry impurities on the surface of the seal 3. After the valve plate 12 descends to its limit position and completely cuts off the medium flow channel, the hydraulic station fills the annular hydraulic chamber 131 with high-pressure hydraulic oil, pushing the clamping ring 2 to move closer to the valve plate 12, tightly pressing the sealing section of the seal 3 against the surface of the valve plate 12 to form a sealing contact surface, thus achieving the sealing and closure of the medium flow channel.

[0048] When the medium flow channel needs to be opened, the hydraulic station discharges the hydraulic oil from the annular hydraulic chamber 131, and the seal 3 at the front end of the clamping ring 2 separates from the surface of the valve plate 12, releasing the hydraulic seal. Simultaneously, the hydraulic station fills the annular hydraulic chamber 132 with high-pressure hydraulic oil, pushing the movable block 4 towards the valve plate 12. Through the linkage of the linkage pipe 6, the movable block 5 moves away from the valve plate 12. The movable block 4 stops after reaching a position where it contacts the surface of the valve plate 12, and the push rod of the hydraulic cylinder retracts upward, causing the valve plate 12 to move upward. The scraping section of the seal 3 at the front end of the movable block 4 scrapes away slurry impurities from the surface of the valve plate 12, preventing impurities from being carried to the upper part of the valve seat 13. Furthermore, as the movable block 5 moves away from the valve plate 12, the drive source in this area starts, rotating the screw 71, causing the slider 72 to pull the scraping section of the seal 3 at the front end of the movable block 5 into a tensioned state. Subsequently, the tensioned part of the seal 3 is flushed and cleaned by the flushing assembly. When valve plate 12 moves to its limit position, it fully opens the medium flow channel, and the slurry medium resumes free flow.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A hydraulically combined penetrating slurry gate valve, comprising a valve body (11), a valve plate (12), and two valve seats (13), wherein the valve body (11) has a medium flow channel, characterized in that, Each valve seat (13) is equipped with a sealing mechanism and a cleaning mechanism; The sealing mechanism includes a clamping ring (2) and a sealing element (3). The clamping ring (2) is slidably mounted on the valve seat (13) along the axial direction of the medium flow channel. The sealing element (3) is located on the side of the clamping ring (2) facing the valve plate (12). The clamping ring (2) can move towards the valve plate (12) and press the sealing element (3) against the valve plate (12) to achieve a seal. The cleaning mechanism includes movable block one (4), movable block two (5), tensioning assembly and flushing assembly. Movable block one (4) and movable block two (5) are respectively a semi-circular ring located at the upper part and a semi-circular ring located at the lower part. They are slidably installed on valve seat (13) along the axial direction of the medium flow channel and cooperate to form a circular structure. The outer periphery of the circular structure slides and fits against the inner periphery of the pressure ring (2). The pressure ring (2), movable block one (4) and movable block two (5) together form a working surface facing the valve plate (12). The seal (3) covers the working surface. The tensioning assembly is connected to the end of the seal (3). When movable block one (4) or movable block two (5) moves away from the valve plate (12), the tensioning assembly can pull the seal (3) to make it in a tensioned state. The flushing assembly is provided with a water outlet facing the seal (3) for flushing and cleaning the seal (3) when it is in a tensioned state.

2. The hydraulic combined penetrating slurry knife gate valve according to claim 1, characterized in that, When the valve plate (12) moves downward to close the medium flow channel, the second movable block (5) moves towards the valve plate (12) and scrapes the slurry on the surface of the valve plate (12) using the seal (3) at its front end. At the same time, the first movable block (4) moves away from the valve plate (12) and cleans the seal (3) at the front end of the first movable block (4) using the tensioning assembly and the flushing assembly. When the valve plate (12) moves upward to open the medium flow channel, the first movable block (4) moves towards the valve plate (12) and scrapes the slurry on the surface of the valve plate (12) using the seal (3) at its front end. At the same time, the second movable block (5) moves away from the valve plate (12) and cleans the seal (3) at the front end of the second movable block (5) using the tensioning assembly and the flushing assembly.

3. The hydraulic combined penetrating slurry knife gate valve according to claim 1, characterized in that, The sealing mechanism also includes a drive structure for driving the clamping ring (2) to move axially. The drive structure includes an annular hydraulic chamber (131) opened in the valve seat (13). The end of the clamping ring (2) away from the seal (3) is slidably sealed in the annular hydraulic chamber (131). By filling the annular hydraulic chamber (131) with hydraulic medium to generate axial thrust, the clamping ring (2) can be driven to move towards the valve plate (12), thereby pressing the seal (3) against the surface of the valve plate (12) to achieve sealing.

4. A hydraulically combined penetrating slurry gate valve according to claim 2, characterized in that, The cleaning mechanism also includes a second drive structure for driving the first movable block (4) and the second movable block (5) to move axially. The second drive structure includes a second annular hydraulic chamber (132) opened in the valve seat (13) and a linkage pipe (6) connecting the first movable block (4) and the second movable block (5). The end of the first movable block (4) away from the seal (3) is slidably sealed in the second annular hydraulic chamber (132). By filling or discharging hydraulic medium into the second annular hydraulic chamber (132), the first movable block (4) can be driven to move axially. The linkage pipe (6) is filled with incompressible hydraulic medium so as to drive the second movable block (5) to move axially in the opposite direction to the first movable block (4) by volume displacement difference.

5. A hydraulically combined penetrating slurry gate valve according to claim 1, characterized in that, The tensioning assembly is set in multiple groups, and the multiple groups of tensioning assemblies are evenly distributed in the valve seat (13) along the circumference. Each tensioning assembly includes a drive source, a screw (71) and a slider (72). The screw (71) is rotatably installed in the valve seat (13) along the axial direction of the medium flow channel, and the drive source is connected to the screw (71) for driving its rotation. The slider (72) is threadedly connected to the screw (71), and the slider (72) is connected to the corresponding end of the seal (3). When the slider (72) moves away from the valve plate (12), it can pull the seal (3) to produce a feed displacement.

6. A hydraulically combined penetrating slurry gate valve according to claim 5, characterized in that, The seal (3) is a segmented structure that covers the working surface and can move. The seal (3) includes a new segment, a sealing segment, a scraping segment and an old segment distributed sequentially along its feed path. When the seal (3) is moved by the movement of the slider (72), it can be guided to bypass the front end of the clamping ring (2) and the first movable block (4) and the second movable block (5) to change segments. Thus, the unused new segment is moved to the front end of the clamping ring (2) to be converted into a sealing segment, and the original sealing segment is moved to the front end of the first movable block (4) and the second movable block (5) to be converted into a scraping segment.

7. A hydraulically combined penetrating slurry gate valve according to claim 5, characterized in that, The flushing assembly includes multiple water flow channels (133) opened in the valve seat (13). The multiple water flow channels (133) are evenly distributed around the valve seat (13). The inlet end of the water flow channel (133) is connected to the water supply source, and the outlet end is facing the front end of the movable block one (4) or movable block two (5). When the movable block one (4) or movable block two (5) moves away from the valve plate (12) and is in place, the seal (3) is pulled to the tension state by the movement of the slider (72). Then the water flow channel (133) sprays water flow onto the tension part of the seal (3) to flush away the residual slurry on the surface of the seal (3).

8. A hydraulically combined penetrating slurry gate valve according to claim 1, characterized in that, The sealing element (3) is made of elastic rubber material. The working surface formed by the clamping ring (2), movable block one (4) and movable block two (5) is adapted to the shape of the valve plate (12) so that when the sealing element (3) covering the working surface is pressed, it can form a uniform pressure sealing contact surface with the valve plate (12) in the circumferential direction.

9. A hydraulically combined penetrating slurry gate valve according to claim 8, characterized in that, The clamping ring (2), movable block one (4) and movable block two (5) are all provided with an arc-shaped guide surface for supporting the seal (3) at one end facing the valve plate (12). The seal (3) wraps around and fits on the arc-shaped guide surface.

10. A hydraulically combined penetrating slurry gate valve according to claim 1, characterized in that, The bottom of the valve plate (12) has a wedge-shaped cutting edge structure with the tip of the cutting edge structure facing downward, which is used to cut off the slurry in the medium flow channel when the valve plate (12) moves downward.

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