Flat gate valve with cleanable sealing surface

Abstract

The invention discloses a flat gate valve with a cleanable sealing face, and relates to the technical field of flat gate valves, the flat gate valve comprises an arc-shaped scraping plate, the arc-shaped scraping plate is used for conducting scraping type cleaning on the sealing face, namely the side face, of a gate plate, an arc-shaped bottom groove is formed in the bottom of the arc-shaped scraping plate, and the inner wall of the arc-shaped bottom groove is rotationally connected with a threaded grinding rod through a rotating bolt; according to the flat gate valve with the cleanable sealing face, the sealing face of the sliding gate plate is cleaned in a scraping mode through the arc-shaped scraping plate, and therefore the sealing face of the sliding gate plate can be cleaned; the problems that after a valve plate of the flat gate valve is used for a long time, mud and sand particle impurities are gradually accumulated and attached to the surface, the gate plate is abraded in the moving process, the sealing effect on fluid is affected, and impurities mingled between the inner wall of the arc-shaped bottom groove and the threaded grinding rod are rubbed and crushed into small particle impurities to flow away along with the fluid are prevented. And a large number of cleaned particle impurities with large volume or mass are prevented from directly falling into the arc-shaped bottom hole in the bottom of the gate plate to be accumulated.

Description

Technical Field

[0001] The invention relates to the technical field of flat gate valves, and in particular to a flat gate valve with a cleanable sealing surface. Background Art

[0002] The gate valve is one of the most commonly used shut-off valves. It is mainly used to connect or cut off the medium in the pipeline, and is not used to adjust the flow of the medium. Due to the large range of pressure, temperature and diameter span of the gate valve, the gate valve has been widely used in many fields. The main components of the gate valve include the valve seat, valve stem and valve plate. The inner side of the valve seat has a sealing ring, which contacts and seals with the end face of the valve plate to block the flow of the fluid. The flat gate valve is a common type of valve. The gate of the flat gate valve is flat and fits with the sealing surface of the valve seat to achieve the function of cutting off or conducting the fluid. This flat gate structure makes the movement of the gate relatively stable during the opening and closing process of the valve. Since flat gate valves are mostly used to control fluids containing impurities such as oil and sewage, mud and sand particles will gradually accumulate on the surface of the valve plate of the flat gate valve after long-term use, causing wear of the gate plate during movement and affecting the sealing effect of the fluid. Therefore, we proposed a flat gate valve with a cleanable sealing surface. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a flat gate valve with cleanable sealing surface, comprising: A valve body, wherein a valve cover is arranged on the top of the valve body; A valve stem, wherein a hand wheel is arranged on the top of the valve stem; The top of the valve body is connected to the bottom of the valve cover, one end of the valve stem passes through the valve cover and is threadedly connected to the valve cover, and the top of the valve stem is fixedly connected to the bottom of the hand wheel; The bottom of the valve stem is fixedly connected with a gate plate, the inner wall of the valve cover is fixedly connected with a side sealing plate, the bottom of the side sealing plate is fixedly connected with a cleaning device, the outer side of the valve body is fixedly connected with a scraping device, and the inner wall of the valve body is fixedly connected with a filtering device; Wherein, the cleaning device comprises: The arc scraper is used to scrape and clean the sealing surface of the gate plate, that is, the side surface. The arc scraper scrapes and cleans the sealing surface of the sliding gate plate to prevent the valve plate of the flat gate valve from gradually accumulating mud and sand particles on the surface after long-term use, causing the gate plate to wear during movement and affecting the sealing effect of the fluid; The top of the arc-shaped scraper is fixedly connected to the bottom of the side sealing plate; An arc-shaped bottom hole is formed on the outer side of the valve body, and the outer side of the arc-shaped bottom hole is connected to the inner side of the scraping device; The bottom of the arc scraper is provided with an arc bottom groove, and the inner wall of the arc bottom groove is rotatably connected to a threaded grinding rod through a rotating bolt, and impurities mixed between the inner wall of the arc bottom groove and the threaded grinding rod are rubbed and crushed into smaller particles and debris and flow away with the fluid, preventing a large amount of particles and debris with large volume or mass that have been cleaned from directly falling into the arc bottom hole at the bottom of the gate plate for accumulation, and the inner wall of the arc bottom groove is fixedly connected with a frame-shaped connecting plate, and the frame-shaped connecting plate is arranged at a position close to one side of the inner wall of the arc bottom groove to facilitate the discharge of the cleaned particles and debris, and prevent a large amount of cleaned particles and debris from accumulating between the hard brush and the inner wall of the arc bottom groove and being difficult to discharge, which affects the subsequent cleaning effect of the hard brush, and the side of the frame-shaped connecting plate close to the threaded grinding rod is fixedly connected with a hard brush, and the hard brush rubs and cleans the thread surface of the rotating threaded grinding rod, preventing too many particles and debris from being mixed between the thread gaps of the threaded grinding rod after long-term use and being difficult to discharge, which affects the subsequent crushing effect; A plurality of the hard brushes are provided, and the plurality of the hard brushes are evenly distributed on one side of the frame-shaped connecting plate.

[0004] Furthermore, the scraping device includes an arc-shaped concave shell, an arc-shaped through hole is provided on the outer side of the arc-shaped concave shell, and a T-shaped slider is slidably connected to the inner wall of the arc-shaped through hole, and one end of the T-shaped slider is fixedly connected to an arc-shaped baffle, and the coverage area of ​​the arc-shaped through hole is adjusted by arranging arc-shaped baffles distributed in a staggered manner in the arc-shaped concave shell to prevent blockage caused by a large amount of accumulated particles and debris in the arc-shaped concave shell, which is difficult to discharge and affects the use of the gate valve; a frame-shaped scraper is fixedly connected to the inner side of the arc-shaped baffle, and the frame-shaped scraper moving along the arc path performs a scraping and cleaning operation on the arc-shaped surface of the bottom surface of the gate plate to prevent a large amount of particles and debris from being attached to the bottom surface of the gate plate, which makes it difficult to insert the gate plate into the arc-shaped bottom hole when the gate plate moves downward and cannot perform a blocking seal on the fluid; a frame-shaped scraper with a hollow area is arranged on the inner side of the arc-shaped baffle to facilitate the passage of the scraped particles and debris, and to prevent the scraped particles and debris from accumulating on the top of the scraper plate when the frame scraper plate moves back upward along the arc path. The cam is connected with a toothed plate on one side of the fixing plate, and a toothed plate is connected with the toothed plate on the other side of the fixing plate, and a toothed plate is connected with the toothed plate on the other side of the fixing plate.

[0005] Furthermore, the filter device includes an inner square plate, one side of the inner square plate is fixedly connected to the motor, the outer side of the motor is sleeved and fixedly connected to a sleeve-type housing, the driving shaft of the motor is fixedly connected to a linkage rod, the outer side of the linkage rod is sleeved and fixedly connected to an outer oblique sleeve plate, and the fluid and impurities flowing into the valve body are gradually diverted and diffused to the surroundings by arranging the outer oblique sleeve plate on the outer side of the linkage rod, so as to prevent the impurities flowing into the valve body from continuously accumulating at the connection between the motor and the linkage rod and affecting its rotation, the outer side of the linkage rod is sleeved and rotatably connected to a circular baffle plate through a bearing, one side of the circular baffle plate is provided with a filtering circular hole, and the large particles and debris in the fluid are blocked and filtered by arranging the circular baffle plates with filtering circular holes at the connecting ports at both ends of the valve body, so as to prevent the large particles and debris in the fluid from accumulating inside the valve body and damaging the gate plate, and easily causing blockage and affecting the use of parts, and the outer side of the linkage rod is fixedly connected to A corrugated scraper is connected, and as the corrugated scraper rotates with the linkage rod, it scrapes and cleans the side of the circular baffle, to prevent the accumulation of a large number of particles and debris blocked by the side of the circular baffle, gradually covering the filter circular hole and affecting the flow of fluid into the valve body; the outer side of the corrugated scraper is fixedly connected with a hook-shaped barb, and the hook-shaped barb intermittently penetrates into the filter circular hole when it rotates to perform piercing cleaning on the inside of the filter circular hole, to prevent the accumulation of a large number of particles and debris on the side of the circular baffle, and the filter circular hole is mixed with a certain amount of particles and debris that are difficult to be scraped off by the corrugated scraper, causing blockage; the top and bottom of the inscribed square plate are fixedly connected to the inner wall of the valve body, the outer side of the circular baffle is fixedly connected to the inner wall of the valve body, a plurality of filter circular holes are provided, and the plurality of filter circular holes are distributed on the circular baffle, four corrugated scrapers are provided, and the four corrugated scrapers are evenly distributed on the linkage rod, a plurality of hook-shaped barbs are provided, and the plurality of hook-shaped barbs are distributed on the corrugated scraper.

[0006] The present invention has the beneficial effects: 1. The present invention uses an arc scraper to scrape and clean the sealing surface of the sliding gate plate, so as to prevent the valve plate of the flat gate valve from gradually accumulating mud and sand particles on the surface after long-term use, causing the gate plate to wear during movement and affecting the sealing effect on the fluid. The frame scraper moving along the arc path scrapes and cleans the arc surface of the bottom surface of the gate plate, so as to prevent a large number of particles and debris from adhering to the bottom surface of the gate plate, which makes it difficult to insert the gate plate into the arc bottom hole when it moves downward and cannot perform a blocking seal on the fluid. Circular baffles with filtering circular holes are provided at the connecting ports at both ends of the valve body to perform blocking filtering on large particles and debris in the fluid, so as to prevent large particles and debris in the fluid from accumulating inside the valve body, causing damage to the gate plate and easily causing blockage affecting the use of parts.

[0007] 2. The present invention provides a cleaning device, wherein the arc-shaped scraper performs scraping cleaning on the sealing surface of the sliding gate plate, so as to prevent the valve plate of the flat gate valve from gradually accumulating mud, sand and other particles on the surface after long-term use, causing the gate plate to wear during movement and affecting the sealing effect of the fluid; the impurities mixed between the inner wall of the arc-shaped bottom groove and the threaded grinding rod are rubbed and crushed into smaller particles and debris and flow away with the fluid, so as to prevent a large amount of particles and debris cleaned up from directly falling into the arc-shaped bottom hole at the bottom of the gate plate and accumulating with a large volume or mass; the hard brush performs friction cleaning on the thread surface of the rotating threaded grinding rod, so as to prevent the threaded grinding rod from being mixed with too many particles and debris between the thread gaps after long-term use and being difficult to discharge and affecting the subsequent crushing effect; a frame-shaped connecting plate is provided at a position close to one side of the inner wall of the arc-shaped bottom groove to facilitate the emptying of an area for the cleaned particles and debris to be discharged, so as to prevent a large amount of cleaned particles and debris from accumulating between the hard brush and the inner wall of the arc-shaped bottom groove and being difficult to discharge and affecting the subsequent cleaning effect of the hard brush.

[0008] 3. The present invention provides a scraping device, and a frame-shaped scraper moving along the arc path scrapes and cleans the arc surface of the bottom surface of the gate plate, so as to prevent a large number of particles and debris attached to the bottom surface of the gate plate, which may make it difficult to insert the gate plate into the arc bottom hole when it moves downward and cannot block and seal the fluid; a frame-shaped scraper with a hollow area is provided on the inner side of the arc baffle to facilitate the passage of the scraped particles and debris, and prevent the scraped particles and debris from accumulating in the area between the top of the scraper and the inner wall of the arc concave shell when the frame scraper moves back upward along the arc path, affecting the reset; arc baffles with staggered distribution are provided in the arc concave shell to adjust the coverage area of ​​the arc through hole, so as to prevent a large number of particles and debris accumulated in the arc concave shell from causing blockage and difficulty in discharge, affecting the use of the gate valve; the sleeve baffle is driven by the restoring force of the restoring spring to rotate upward around the fixed rod to a horizontal position to resist the T-shaped slider, so as to prevent the arc baffle from sliding downward due to gravity when the fluid inside the valve body flows, causing the fluid to leak outward through the arc through hole.

[0009] 4. The present invention provides a filtering device, and circular baffles with filtering circular holes are provided at the connecting ports at both ends of the valve body to filter large particles in the fluid in a blocking manner, so as to prevent large particles in the fluid from accumulating inside the valve body and damaging the gate plate, and easily causing blockage and affecting the use of parts. An outer inclined sleeve is provided on the outside of the linkage rod to gradually guide and diffuse the fluid and impurities flowing into the valve body to the surrounding areas, so as to prevent impurities flowing into the valve body with the fluid from continuously accumulating at the connection between the motor and the linkage rod and affecting its rotation. The corrugated scraper rotating with the linkage rod scrapes and cleans the side of the circular baffle, so as to prevent the particles blocked by the side of the circular baffle from accumulating more and gradually covering the filtering circular holes and affecting the fluid from flowing into the valve body. The hook-shaped barb intermittently penetrates into the filtering circular holes when rotating to perform piercing cleaning on the inside of the filtering circular holes, so as to prevent the particles accumulated on the side of the circular baffle from being mixed with certain particles in the filtering circular holes when there are more particles that are difficult to be scraped off by the corrugated scraper and causing blockage. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the structure of the flat gate valve of the present invention; Figure 2 This is a schematic diagram of the internal structure of the flat gate valve of the present invention; Figure 3 This is a schematic diagram of the bottom structure of the cleaning device of the present invention; Figure 4 This is an enlarged structural diagram of the bottom A of the cleaning device of the present invention; Figure 5 It is a schematic diagram of the side cross-section structure of the bottom of the scraping device of the present invention; Figure 6 It is an enlarged structural schematic diagram of the bottom side section B of the scraping device of the present invention; Figure 7 It is a schematic diagram of the side cross-sectional structure of the filtering device of the present invention; Figure 8 It is a schematic diagram of the enlarged structure of the side section C of the filtering device of the present invention.

[0011] In the figure: 1, valve body; 2, valve cover; 3, valve stem; 4, hand wheel; 5, gate; 6, side sealing plate; 7, cleaning device; 8, scraping device; 9, filtering device; 10, arc bottom hole; 701, arc scraper; 702, arc bottom groove; 703, thread grinding rod; 704, frame connecting plate; 705, hard brush; 801, arc concave shell; 802, arc through hole; 803, T-shaped slider; 80 4. Arc-shaped baffle; 805. Frame-shaped scraper; 806. Side connecting plate; 807. Fixed plate; 808. Fixed rod; 809. Sleeve-type baffle; 810. Retracting spring; 901. Inner square plate; 902. Motor; 903. Sleeve-type housing; 904. Linkage rod; 905. Outer inclined sleeve plate; 906. Round baffle; 907. Filter round hole; 908. Corrugated scraper; 909. Hook-shaped barb. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the purpose of illustration and description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0013] For the first embodiment, please refer to Figure 1-Figure 4 The present invention is a flat gate valve with a cleanable sealing surface, comprising: A valve body 1, with a valve cover 2 disposed on the top of the valve body 1; A valve stem 3, a hand wheel 4 is arranged on the top of the valve stem 3; The top of the valve body 1 is connected to the bottom of the valve cover 2, one end of the valve stem 3 passes through the valve cover 2 and is threadedly connected to the valve cover 2, and the top of the valve stem 3 is fixedly connected to the bottom of the hand wheel 4; The bottom of the valve stem 3 is fixedly connected with a gate plate 5, the inner wall of the valve cover 2 is fixedly connected with a side sealing plate 6, the bottom of the side sealing plate 6 is fixedly connected with a cleaning device 7, the outer side of the valve body 1 is fixedly connected with a scraping device 8, and the inner wall of the valve body 1 is fixedly connected with a filtering device 9; Wherein, the cleaning device 7 comprises: The arc scraper 701 is used to scrape and clean the sealing surface, that is, the side surface, of the gate plate 5; The top of the arc scraper 701 is fixedly connected to the bottom of the side sealing plate 6; An arc-shaped bottom hole 10 is formed on the outer side of the valve body 1, and the outer side of the arc-shaped bottom hole 10 is connected to the inner side of the scraping device 8; The bottom of the arc scraper 701 is provided with an arc bottom groove 702, the inner wall of the arc bottom groove 702 is rotatably connected to a threaded grinding rod 703 through a rotating bolt, the inner wall of the arc bottom groove 702 is fixedly connected to a frame connecting plate 704, and a hard brush 705 is fixedly connected to one side of the frame connecting plate 704 close to the threaded grinding rod 703; There are multiple hard brushes 705, and the multiple hard brushes 705 are evenly distributed on one side of the frame-shaped connecting plate 704. When in use, the valve stem 3 is driven to rotate by turning the hand wheel 4, so that the valve stem 3 and the valve cover 2 threadedly cooperate to move up and down. When the valve stem 3 moves down, it drives the bottom gate plate 5 to move down to the inside of the valve body 1 until the gate plate 5 moves down to the inside of the arc bottom hole 10 to seal and block the fluid inside the valve body 1. When the hand wheel 4 is reversed and the gate plate 5 is driven to move up through the valve stem 3, the sealing blockage of the fluid inside the valve body 1 is released. The gate plate 5 is always located below the side sealing plate 6 so that The fluid inside the valve body 1 will not penetrate into the valve cover 2. When the gate plate 5 moves up and down, the sealing surface of the gate plate 5, that is, the side surface, is always in contact with the cleaning device 7 at the bottom of the side sealing plate 6. The cleaning device 7 scrapes and cleans the sealing surface of the moving gate plate 5. When the gate plate 5 moves down to the inside of the arc-shaped bottom hole 10, the scraping device 8 can be used to scrape and clean the arc surface of the bottom surface of the gate plate 5. By arranging the filter device 9 at the connection ports at both ends of the valve body 1, the impurities with larger particle sizes in the fluid are blocked and filtered. When the gate plate 5 moves up and down, the sealing surface, that is, the two side surfaces The arc scraper 701 is always in contact with the side of the arc scraper 701, and the arc scraper 701 scrapes and cleans the sealing surface of the sliding gate plate 5. At the same time, the threaded grinding rod 703 in the arc bottom groove 702 is also in contact with the side of the gate plate 5. The threaded grinding rod 703 in contact with the sliding gate plate 5 is driven to rotate together. The particles and debris scraped off by the arc scraper 701 fall downward on the threaded grinding rod 703 and are mixed between the inner wall of the arc bottom groove 702 and the threaded grinding rod 703 as the threaded grinding rod 703 rotates. The impurities between the rods 703 are rubbed and broken into smaller particles and debris that flow away with the fluid. The surface of the rotating threaded grinding rod 703 is always in contact with the hard brush 705 on one side of the frame-shaped connecting plate 704. The hard brush 705 rubs and cleans the thread surface of the rotating threaded grinding rod 703. A large amount of particles and debris scraped off by the hard brush 705 will fall on the frame-shaped connecting plate 704 and pass through the frame-shaped connecting plate 704 and fall downward. By arranging the frame-shaped connecting plate 704 at a position close to the inner wall of the arc-shaped bottom groove 702, it is convenient to leave an area for the cleaned particles and debris to be discharged.

[0014] For the second embodiment, please refer to Figure 1-Figure 8The present invention provides a flat gate valve with a cleanable sealing surface: the scraping device 8 includes an arc-shaped concave shell 801, an arc-shaped through hole 802 is opened on the outer side of the arc-shaped concave shell 801, a T-shaped slider 803 is slidably connected to the inner wall of the arc-shaped through hole 802, one end of the T-shaped slider 803 is fixedly connected to an arc-shaped baffle 804, the inner side of the arc-shaped baffle 804 is fixedly connected to a frame-shaped scraper 805, one side of the arc-shaped concave shell 801 is fixedly connected to a side connecting plate 806, the side connecting plate 806 is fixedly connected to a fixed plate 807 close to the arc-shaped concave shell 801, and the fixed plate 807 is close to the arc-shaped concave shell 801. A fixing rod 808 is fixedly connected to one side of the concave shell 801, a sleeve-type baffle 809 is sleeved on the outer side of the fixing rod 808 and is rotatably connected through a bearing, a return spring 810 is fixedly connected to the inner side of the sleeve-type baffle 809, the inner side of the arc-shaped concave shell 801 is fixedly connected to the outer side of the valve body 1, the inner side of the arc-shaped concave shell 801 is connected to the outer side of the arc-shaped bottom hole 10, the side of the sleeve-type baffle 809 away from the arc-shaped concave shell 801 is rotatably connected to one side of the fixing plate 807 through a rotating bolt, and the return spring 810 is sleeved on the fixing rod 808 and is fixedly connected to the fixing rod 808; The filtering device 9 includes an inner square plate 901, one side of the inner square plate 901 is fixedly connected to a motor 902, the outer side of the motor 902 is sleeved and fixedly connected to a sleeve-type housing 903, the driving shaft of the motor 902 is fixedly connected to a linkage rod 904, the outer side of the linkage rod 904 is sleeved and fixedly connected to an outer oblique sleeve plate 905, the outer side of the linkage rod 904 is sleeved and fixedly connected to a circular baffle 906 through a bearing, one side of the circular baffle 906 is provided with a filtering circular hole 907, the outer side of the linkage rod 904 is fixedly connected to a corrugated scraper 908, the outer side of the corrugated scraper 908 is fixedly connected to a hook-shaped barbed strip 909, the top and bottom of the inner square plate 901 are fixedly connected to the inner wall of the valve body 1, and the outer side of the circular baffle 906 is fixed to the inner wall of the valve body 1 The circular filtering holes 907 are connected, and the circular filtering holes 907 are distributed on the circular baffle 906. Four corrugated scrapers 908 are provided, and the four corrugated scrapers 908 are evenly distributed on the linkage rod 904. There are multiple hook-shaped barbs 909, and the multiple hook-shaped barbs 909 are distributed on the corrugated scrapers 908. When in use, when the gate plate 5 moves down to the inside of the arc-shaped bottom hole 10, the T-shaped slider 803 is pushed downward to pass through the sleeve baffle 809 and move in an arc along the path of the arc-shaped through hole 802. When the T-shaped slider 803 moves, it drives the arc baffle 804 on one side to move together. When the arc baffle 804 moves, it drives the inner frame scraper 805 to move together. When the frame scraper 805 moves, it is in contact with the arc surface of the bottom surface of the gate plate 5 at all times. The frame-shaped scraper 805 moving along the arc path scrapes and cleans the arc surface of the bottom of the gate plate 5. The frame-shaped scraper 805 with a hollow area is arranged on the inner side of the arc baffle 804 to facilitate the passage of scraped particles and debris. The arc baffles 804 are arranged in a staggered manner in the arc concave shell 801 to adjust the coverage area of ​​the arc through hole 802. After cleaning, the sleeve baffle 809 is pushed downward to rotate around the fixed rod 808 to a vertical state. At this time, the T-shaped slider 803 is pushed upward along the arc path of the arc through hole 802 to move above the sleeve baffle 809, and the push on the sleeve baffle 809 is released. The sleeve baffle 809 is driven to rotate upward around the fixed rod 808 to a horizontal position by the return force of the return spring 810 to close the T-shaped The slider 803 is used to resist, and a circular baffle 906 with filtering circular holes 907 is provided at the connection ports at both ends of the valve body 1 to block and filter large particles of debris in the fluid, and the motor 902 is started to drive the linkage rod 904 to rotate, and the rotation of the linkage rod 904 drives the outer inclined sleeve plate 905 and the corrugated scraper 908 on the outside to rotate together, and the outer inclined sleeve plate 905 is provided on the outside of the linkage rod 904 to gradually guide and diffuse the fluid and impurities flowing into the valve body 1 to the surroundings, and the side of the corrugated scraper 908 is in contact with the surface of the circular baffle 906 at all times when the corrugated scraper 908 rotates, and the corrugated scraper 908 that rotates with the linkage rod 904 scrapes and cleans the side of the circular baffle 906, and the corrugated scraper 908 drives the hook-shaped barbed strip 909 on the outside to rotate together,When the hook-shaped barbed bar 909 rotates, it intermittently penetrates into the filter hole 907 to perform penetration cleaning inside the filter hole 907.

[0015] When the present invention is operated and used, the valve stem 3 is driven to rotate by rotating the hand wheel 4, so that the valve stem 3 and the valve cover 2 are threadedly matched to move up and down. When the valve stem 3 moves down, it drives the gate plate 5 at the bottom to move down to the inside of the valve body 1, until the gate plate 5 moves down to the inside of the arc bottom hole 10 to seal and block the fluid inside the valve body 1. When the hand wheel 4 is reversed and the gate plate 5 is driven to move up through the valve stem 3, the sealing blockage of the fluid inside the valve body 1 is released. The gate plate 5 is always located below the side sealing plate 6 so that the fluid inside the valve body 1 does not penetrate into the valve cover 2. When the gate plate 5 moves up and down, the sealing surface of the gate plate 5, that is, the side surface, is always in contact with the cleaning device 7 at the bottom of the side sealing plate 6. The cleaning device 7 scrapes and cleans the sealing surface of the moving gate plate 5. When the gate plate 5 moves down to the inside of the arc bottom hole 10 The scraping device 8 can be used to scrape and clean the arc surface of the bottom surface of the gate plate 5. By setting the filtering device 9 at the connecting ports at both ends of the valve body 1, the impurities with larger particle sizes in the fluid can be blocked and filtered. When the gate plate 5 moves up and down, the sealing surface, that is, the two side surfaces, are always in contact with the side surfaces of the arc scraper 701. The arc scraper 701 scrapes and cleans the sealing surface of the sliding gate plate 5. At the same time, the threaded grinding rod 703 in the arc bottom groove 702 is also always in contact with the side surfaces of the gate plate 5. The threaded grinding rod 703 in contact with the sliding gate plate 5 is driven to rotate together. The particles and debris scraped off by the arc scraper 701 fall downward on the threaded grinding rod 703 and are mixed with the inner wall of the arc bottom groove 702 and the threaded grinding rod as the threaded grinding rod 703 rotates. 703, impurities mixed between the inner wall of the arc bottom groove 702 and the threaded grinding rod 703 are rubbed and crushed into smaller particles and debris and flow away with the fluid. The surface of the rotating threaded grinding rod 703 is always in contact with the hard brush 705 on one side of the frame connecting plate 704. The hard brush 705 rubs and cleans the thread surface of the rotating threaded grinding rod 703. A large amount of particles and debris scraped off by the hard brush 705 will fall on the frame connecting plate 704 and pass through the frame connecting plate 704 and fall downward. By arranging the frame connecting plate 704 at a position close to the inner wall of the arc bottom groove 702, it is convenient to leave an empty area for the cleaned particles and debris to be discharged. When the gate plate 5 moves down to the inside of the arc bottom hole 10, by pushing the T-shaped slider 803 downward through the sleeve baffle 809 along The path of the arc-shaped through hole 802 moves in an arc shape. When the T-shaped slider 803 moves, it drives the arc-shaped baffle 804 on one side to move together. When the arc-shaped baffle 804 moves, it drives the frame-shaped scraper 805 on the inside to move together. When the frame-shaped scraper 805 moves, it always contacts the arc-shaped surface of the bottom surface of the gate plate 5. The frame-shaped scraper 805 moving along the arc path performs scraping cleaning on the arc-shaped surface of the bottom surface of the gate plate 5. By arranging a frame-shaped scraper 805 with a hollow area on the inner side of the arc-shaped baffle 804, it is convenient for the scraped particles and debris to pass through. By arranging staggered arc-shaped baffles 804 in the arc-shaped concave shell 801, the coverage area of ​​the arc-shaped through hole 802 is adjusted. After cleaning, the sleeve baffle 809 is pushed downward to rotate around the fixed rod 808 to a vertical state.At this time, the T-shaped slider 803 is pushed upward along the arc path of the arc through hole 802 to move above the sleeve baffle 809, and the push on the sleeve baffle 809 is released. The sleeve baffle 809 is driven to rotate upward around the fixed rod 808 to a horizontal position by the tightening force of the tightening spring 810 to resist the T-shaped slider 803. The circular baffles 906 with filtering holes 907 are provided at the connecting ports at both ends of the valve body 1 to block and filter large particles in the fluid. The motor 902 is started to drive the linkage rod 904 to rotate, and the linkage rod 904 rotates to drive the outer outer inclined sleeve plate 906 on the outside. 05 and the corrugated scraper 908 rotate together, and the fluid and impurities flowing into the valve body 1 are gradually diverted and diffused to the surroundings by setting an outer inclined sleeve 905 on the outside of the linkage rod 904. When the corrugated scraper 908 rotates, the side surface is always in contact with the surface of the circular baffle 906. As the linkage rod 904 rotates, the corrugated scraper 908 scrapes and cleans the side surface of the circular baffle 906. When the corrugated scraper 908 rotates, it drives the hook-shaped barbed strip 909 on the outside to rotate together. When the hook-shaped barbed strip 909 rotates, it intermittently penetrates into the filter circular hole 907 to penetrate and clean the inside of the filter circular hole 907.

[0016] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A flat gate valve with cleanable sealing surface, characterized in that: include: A valve body (1), wherein a valve cover (2) is arranged on the top of the valve body (1); A valve stem (3), wherein a hand wheel (4) is provided on the top of the valve stem (3); The top of the valve body (1) is connected to the bottom of the valve cover (2), one end of the valve stem (3) passes through the valve cover (2) and is threadedly connected to the valve cover (2), and the top of the valve stem (3) is fixedly connected to the bottom of the hand wheel (4); The bottom of the valve stem (3) is fixedly connected to a gate plate (5), the inner wall of the valve cover (2) is fixedly connected to a side sealing plate (6), the bottom of the side sealing plate (6) is fixedly connected to a cleaning device (7), the outer side of the valve body (1) is fixedly connected to a scraping device (8), and the inner wall of the valve body (1) is fixedly connected to a filtering device (9); Wherein, the cleaning device (7) comprises: An arc-shaped scraper (701), the arc-shaped scraper (701) is used to scrape and clean the sealing surface, that is, the side surface, of the gate plate (5); The top of the arc-shaped scraper (701) is fixedly connected to the bottom of the side sealing plate (6).

2. A sealing surface cleanable flat gate valve according to claim 1, characterized in that: An arc-shaped bottom hole (10) is provided on the outer side of the valve body (1), and the outer side of the arc-shaped bottom hole (10) is connected to the inner side of the scraping device (8).

3. A sealing surface cleanable flat gate valve according to claim 1, characterized in that: The bottom of the arc-shaped scraper (701) is provided with an arc-shaped bottom groove (702), the inner wall of the arc-shaped bottom groove (702) is rotatably connected to a threaded grinding rod (703) via a rotating bolt, the inner wall of the arc-shaped bottom groove (702) is fixedly connected to a frame-shaped connecting plate (704), and a hard brush (705) is fixedly connected to a side of the frame-shaped connecting plate (704) close to the threaded grinding rod (703).

4. A sealing surface cleanable flat gate valve according to claim 3, characterized in that: A plurality of the hard brushes (705) are provided, and the plurality of the hard brushes (705) are evenly distributed on one side of the frame-shaped connecting plate (704).

5. The sealing surface cleanable flat gate valve according to claim 1, characterized in that: The scraping device (8) comprises an arc-shaped concave shell (801), an arc-shaped through hole (802) is formed on the outer side of the arc-shaped through hole (802), a T-shaped slider (803) is slidably connected to the inner wall of the arc-shaped through hole (802), one end of the T-shaped slider (803) is fixedly connected to an arc-shaped baffle plate (804), the inner side of the arc-shaped baffle plate (804) is fixedly connected to a frame-shaped scraper plate (805), one side of the arc-shaped concave shell (801) is fixedly connected to a side connecting plate (806), a side of the side connecting plate (806) close to the arc-shaped concave shell (801) is fixedly connected to a fixing plate (807), a side of the fixing plate (807) close to the arc-shaped concave shell (801) is fixedly connected to a fixing rod (808), a sleeve-type baffle plate (809) is sleeved on the outer side of the fixing rod (808) and rotatably connected via a bearing, and a return spring (810) is fixedly connected to the inner side of the sleeve-type baffle plate (809).

6. A sealing surface cleanable flat gate valve according to claim 5, characterized in that: The inner side of the arc-shaped concave shell (801) is fixedly connected to the outer side of the valve body (1), and the inner side of the arc-shaped concave shell (801) is communicated with the outer side of the arc-shaped bottom hole (10).

7. A sealing surface cleanable flat gate valve according to claim 5, characterized in that: The side of the sleeve baffle (809) away from the arc-shaped concave shell (801) is rotatably connected to the side of the fixed plate (807) via a rotating bolt, and the return spring (810) is sleeved on the fixed rod (808) and fixedly connected to the fixed rod (808).

8. The sealing surface cleanable flat gate valve according to claim 1, characterized in that: The filtering device (9) comprises an inscribed square plate (901), one side of the inscribed square plate (901) is fixedly connected to a motor (902), the outer side of the motor (902) is sleeved and fixedly connected to a sleeve-type housing (903), the driving shaft of the motor (902) is fixedly connected to a linkage rod (904), the outer side of the linkage rod (904) is sleeved and fixedly connected to an outer oblique sleeve plate (905), the outer side of the linkage rod (904) is sleeved and fixedly connected to a circular baffle (906), the outer side of the linkage rod (904) is sleeved and rotatably connected to the circular baffle (906) via a bearing, one side of the circular baffle (906) is provided with a filtering circular hole (907), the outer side of the linkage rod (904) is fixedly connected to a corrugated scraper (908), and the outer side of the corrugated scraper (908) is fixedly connected to a hook-shaped barbed strip (909).

9. A sealing surface cleanable flat gate valve according to claim 8, characterized in that: The top and bottom of the inscribed square plate (901) are both fixedly connected to the inner wall of the valve body (1), and the outer side of the circular baffle (906) is fixedly connected to the inner wall of the valve body (1).

10. A sealing surface cleanable flat gate valve according to claim 8, characterized in that: A plurality of the filtering circular holes (907) are provided, and the plurality of the filtering circular holes (907) are distributed on the circular baffle (906); four corrugated scrapers (908) are provided, and the four corrugated scrapers (908) are evenly distributed on the linkage rod (904); and a plurality of the hook-shaped barbs (909) are provided, and the plurality of the hook-shaped barbs (909) are distributed on the corrugated scrapers (908).

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