A two-piece knife gate valve

Abstract

The application discloses a two-piece knife gate valve and relates to the technical field of knife gate valves, and aims to solve the problem that in the prior art, when a gate plate and a sealing strip are attached, mud and impurities are retained between the gate plate and the sealing strip, thereby affecting the sealing effect, and the two-piece knife gate valve comprises a left valve body and a right valve body fixedly connected with the left valve body through bolts, a sealing cavity is arranged between the right valve body and the left valve body, rectangular medium channels are arranged on the outer walls of the left valve body and the right valve body and penetrate the left valve body and the right valve body and are communicated with the sealing cavity, first sealing rubber strips are fixedly connected to the inner walls of the sealing cavity, a rectangular gate plate is arranged in the sealing cavity, and the two sides of the gate plate are attached to the two side inner walls of the first sealing rubber strips. The application has the advantage that the probability that the sealing property of the gate valve is affected by impurities is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of knife gate valves, in particular to a two-piece knife gate valve. BACKGROUND

[0002] As an important flow regulating and cutting device, the knife gate valve is widely used in tap water, sewage, construction, petroleum, chemical industry, food, medicine, light textile, power, ship, metallurgy, energy system and many other pipelines.

[0003] The traditional knife gate valve usually adopts the structure of sealing strip cooperating with the sealing plate to realize sealing. In this structure, when the knife gate valve is used to transport medium containing impurities such as sand, the medium containing impurities such as sand is in a flowing state during the process of the sealing plate being attached to the sealing strip. Part of the impurities will be retained between the sealing plate and the sealing strip when the sealing plate and the sealing strip are about to be attached, which affects the attachment effect between the sealing plate and the sealing strip, thereby affecting the sealing effect of the valve and easily causing leakage of the valve. In view of this, we propose a two-piece knife gate valve. SUMMARY

[0004] The purpose of the present application is to provide a two-piece knife gate valve, which aims to solve the problem that in the prior art, when the sealing plate is attached to the sealing strip, the impurities such as sand are retained between the two, thereby affecting the sealing effect.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a two-piece knife gate valve, comprising a left valve body and a right valve body fixedly connected to the left valve body by bolts, a sealing cavity is arranged between the right valve body and the left valve body, a rectangular medium channel penetrating through the outer wall of the left valve body and the right valve body and communicating with the sealing cavity is arranged on the outer wall of the left valve body and the right valve body, a first sealing rubber strip is fixedly connected to the inner wall of the sealing cavity, a rectangular sealing plate is arranged in the sealing cavity, the two sides of the sealing plate are attached to the two inner walls of the first sealing rubber strip respectively, a second sealing rubber strip is fixedly connected to the bottom of the sealing plate, the top of the sealing plate penetrates through the top of the sealing cavity to the outside thereof, and a limiting plate is sleeved outside the sealing plate, the limiting plate is fixedly connected to the top of the left valve body and the right valve body by bolts respectively, the opposite sides of the first sealing rubber strip and the second sealing rubber strip are formed with mutually corresponding attachment parts, the bottom of the first sealing rubber strip and the top of the second sealing rubber strip are provided with rubber strip grooves, and a thrust mechanism for pushing the inner wall of the rubber strip groove is arranged in the rubber strip groove.

[0006] Preferably, the thrust mechanism comprises receiving members arranged in the rubber strip groove respectively, and the receiving members are provided with receiving grooves near one side of the fitting part, the inner walls of the two ends of the receiving grooves are fixedly connected with a plurality of mutually symmetrical U-shaped members, the inner surfaces of the opposite two U-shaped members are slidably connected with a push plate, the inner end walls of the U-shaped members are fixedly connected with guide columns, the other ends of the guide columns penetrate through the push plate and are slidably connected with the push plate, the outer walls of the guide columns are all sleeved with first springs, the two ends of the first springs are fixedly connected with the outer wall of the push plate and the inner end wall of the U-shaped member respectively, the push plate located at the middle is the longest in moving distance under the pushing of the first spring, the moving distances of the push plates on both sides gradually shorten, and the end of the push plate near the fitting part pushes the inner wall of the rubber strip groove under the elastic force of the first spring to make the fitting part form a relatively triangular structure.

[0007] Preferably, the inner walls of the receiving grooves are fixedly connected with a plurality of vibrating pipes, the vibrating pipes and the push plate are staggered, the inner walls of the vibrating pipes are slidably connected with vibrating columns, the inner end walls of the vibrating pipes are fixedly connected with second springs, the two ends of the second springs are fixedly connected with one end of the vibrating column inside the vibrating pipe and the inner end wall of the vibrating pipe respectively, the outer walls of the vibrating columns are provided with recycling grooves, the inner walls of the recycling grooves are fixedly connected with a plurality of guide rods, the outer walls of the guide rods are all sleeved with fourth springs, one end of the fourth spring is fixedly connected with the inner wall of the recycling groove, the other end of the fourth spring is fixedly connected with a triangular linkage, the linkage is penetrated by the guide rod and is slidably connected with the guide rod, and the outer wall of the push plate is fixedly connected with a pushing member for pushing the linkage.

[0008] Preferably, the outer walls of the vibrating pipes are all sleeved with third springs, and the outer walls of the vibrating pipes are slidably connected with unlocking pipes.

[0009] Preferably, the unlocking pipes in the same column gradually shorten in moving distance from one side to the other under the thrust of the third spring to form a trapezoidal arrangement, and the trapezoidal arrangement directions of the unlocking pipes of the adjacent two columns are oppositely arranged.

[0010] Preferably, the outer walls of the vibrating columns are all fixedly connected with anti-dropping rings in the same horizontal line, and the linkage is located between the anti-dropping ring and the vibrating pipe.

[0011] Preferably, the end of the push plate near the fitting part is fixedly connected with symmetrically arranged connecting plates, a resisting roller is arranged between the connecting plates, and the two ends of the resisting roller are rotatably connected with the opposite sides of the connecting plates.

[0012] Preferably, the top of the gate is provided with a support, the bottom of the support is fixedly connected with the top of the left valve body and the right valve body through bolts respectively, the top of the gate is fixedly connected with a connecting block, the top of the connecting block is rotatably connected with a threaded rod, the other end of the threaded rod penetrates through the support and is threadedly connected therewith, and the end of the threaded rod penetrating through the support is further fixedly connected with a handle wheel.

[0013] Preferably, a cutoff groove is formed in the outer wall of the abutment part at the second sealing rubber strip, the cutoff groove is located in the middle of the abutment part, and the cutoff groove forms a semicircular structure when the abutment part forms a triangular structure.

[0014] Preferably, the inner wall of the sealing cavity is fixedly connected with a plurality of third sealing rubber strips arranged in sequence, and the inner surface of the third sealing rubber strip is abutted with the outer wall of the gate.

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

[0016] 1、By setting the left valve body, the right valve body, the sealing cavity, the medium channel, the first sealing rubber strip, the gate, the second sealing rubber strip, the limiting plate, the abutment part, the rubber strip groove and the thrust mechanism, the abutment part is gradually abutted and restored to a plane, and in this process, since the abutment part is gradually deformed and abutted together in a triangular shape, the two sides of the abutment part will gradually push the medium away, so that the medium gradually leaves the abutment part, and the medium gradually drives the impurities such as silt away, thereby reducing the probability that the sealing performance is affected by impurities.

[0017] 2、The plurality of rows of vibrating pipes fixedly connected with the inner wall of the receiving groove limit the vibrating column, so that the vibrating column can only move linearly along the vibrating pipe, and then the vibrating rod starts to reset quickly under the elastic force of the second spring, thereby impacting the inner wall of the rubber strip groove, so that the abutment part vibrates, thereby allowing the abutment part to shake off the impurities such as silt adhering to the surface thereof, and further reducing the probability that the sealing performance is affected by impurities.

[0018] 3. Under the thrust of the third spring, the moving distance of the unlocking tube in the present invention gradually shortens from one side to the other side to form a trapezoidal arrangement, which makes the linkage part contact with the end of the unlocking tube with the longest moving distance first when moving, and then the linkage parts in the same column contact with the ends of the corresponding unlocking tubes in turn, so that the corresponding vibrating rods can hit the rubber strip groove one by one from one end, so that the bonding part can be hit and vibrated by the vibrating rods in the same column from different positions during one bonding process, thereby further increasing the effect of shaking off impurities such as mud and sand, and the trapezoidal arrangement directions of the unlocking tubes in two adjacent columns are set in opposite directions, which makes the vibrating rods in the two adjacent columns hit the bottom of the rubber strip groove from both sides in turn, thereby further increasing the effect of shaking off impurities such as mud and sand.

[0019] 4. The intercepting groove of the semicircular structure of the present invention will begin to deform when the fitting portion is deformed and fitted, so that the two sides of the intercepting groove are close to each other, and in the process of approaching each other, the mud and sand and other impurities on the fitting portion at the second sealing strip are scratched, thereby ensuring the intercepting effect of the fitting portion during the initial fitting, and reducing the probability of the fitting portion being affected by mud and sand and other impurities during the initial fitting, resulting in the initial intercepting effect being affected, and the continuous circulation of the medium affecting the fitting and sealing effect of the fitting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the disassembly structure of the right valve body in the present invention;

[0022] Figure 3 is a cross-sectional view of the left valve body in the present invention;

[0023] Figure 4 A first cross-sectional view of the storage element of the present invention;

[0024] Figure 5 A second cross-sectional view of the storage member of the present invention;

[0025] Figure 6 A cross-sectional view of the vibrating tube of the present invention;

[0026] Figure 7 for Figure 3 A local enlarged view of point A in FIG;

[0027] Figure 8 for Figure 4 A local enlarged view of point B in FIG;

[0028] Figure 9 for Figure 6 A partial enlarged view of point C in the figure.

[0029] Description of the numbers in the figure:

[0030] 1. Left valve body; 2. Right valve body; 3. Sealing chamber; 4. Medium channel; 6. First sealing strip; 7. Gate; 8. Second sealing strip; 9. Limiting plate; 10. Fitting part; 11. Strip groove; 12. Receiving part; 13. Receiving groove; 14. U-shaped part; 15. Push plate; 16. Guide column; 17. First spring; 18. Vibrating pipe; 19. Vibrating column; 20. Second spring; 21. Recovery groove; 22. Linkage part; 23. Push member; 24. Third spring; 25. Unlocking tube; 26. Anti-slip ring; 27. Connecting plate; 28. Resistor roller; 29. ​​Bracket; 30. Connecting block; 31. Threaded rod; 32. Handle wheel; 33. Intercepting groove; 34. Third sealing strip; 35. Guide rod; 36. Fourth spring. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Example 1

[0033] like Figures 1-9 As shown, a two-piece knife-type gate valve includes a left valve body 1 and a right valve body 2 fixedly connected to the left valve body 1 by bolts. A sealing chamber 3 is provided between the right valve body 2 and the left valve body 1. The outer walls of the left valve body 1 and the right valve body 2 are provided with a rectangular medium channel 4 that penetrates the left valve body 1 and the right valve body 2 and communicates with the sealing chamber 3. The inner wall of the sealing chamber 3 is fixedly connected to a first sealing strip 6. A rectangular gate plate 7 is provided inside the sealing chamber 3. The two sides of the gate plate 7 are respectively fitted with the inner walls of the two sides of the first sealing strip 6. The bottom of the gate plate 7 is fixedly connected to a second sealing strip 8. The top of the gate plate 7 passes through the top of the sealing chamber 3 to its outside, and the gate plate 7 is provided with a limit plate 9 at the outside of the sealing chamber 3. The limit plates 9 are fixedly connected to the tops of the left valve body 1 and the right valve body 2 respectively by bolts. The first sealing strip 6 and the second sealing strip 8 are formed with corresponding fitting portions 10 on the opposite sides. The bottom of the first sealing strip 6 and the top of the second sealing strip 8 are provided with a strip groove 11, and the strip groove 11 is provided with a thrust mechanism for pushing the inner wall of the strip groove 11.

[0034] Specifically, the left valve body 1 and the right valve body 2 are fixedly connected by bolts, the medium channel 4 is communicated with the sealing cavity 3, and then the medium channel 4 is connected with the pipeline conveying the medium, so that the circulation of the medium is realized. When it is necessary to cut off the circulating medium, the gate plate 7 is moved in the sealing cavity 3, so that the gate plate 7 drives the second sealing rubber strip 8 to move towards the first sealing rubber strip 6, so that the first sealing rubber strip 6 and the abutting portion 10 on the second sealing rubber strip 8 abut each other, and the inner wall of the first sealing rubber strip 6 abuts the two side walls of the gate plate 7, so that the gate plate 7 cuts off the sealing cavity 3, so that the medium cannot pass through the sealing cavity 3 any more, thereby realizing the cutting off of the medium. In the process, it needs to be noted that the thrust mechanism will push the inner wall of the rubber strip groove 11, so that the abutting portion 10 is deformed and extended to form a relative triangular structure. In the process of the first sealing rubber strip 6 and the second sealing rubber strip 8 approaching each other, the middle portions of the abutting portion 10 will first contact each other, and with the gradual abutting of the abutting portion 10, the middle portions will first abut each other to preliminarily cut off the medium. At the same time, the thrust mechanism is pushed, and the thrust mechanism gradually releases, so that the abutting portion 10 gradually abuts and restores to a plane. In this process, since the abutting portion 10 is gradually deformed and abuts together in a triangular shape, the two sides of the abutting portion 10 will gradually push the medium away, so that the medium gradually leaves the abutting portion 10, thereby reducing the probability that the sealing performance is affected by impurities.

[0035] Further, the thrust mechanism includes receiving members 12 arranged in the rubber strip grooves 11 respectively, and the side of each receiving member 12 close to the abutting portion 10 is provided with a receiving groove 13. The inner walls of the two ends of the receiving groove 13 are fixedly connected with a plurality of mutually symmetrical U-shaped members 14. The inner surfaces of the opposite two U-shaped members 14 are slidably connected with a push plate 15. The inner end walls of the U-shaped members 14 are fixedly connected with guide columns 16. The other ends of the guide columns 16 penetrate through the push plate 15 and are slidably connected with the push plate 15. The outer walls of the guide columns 16 are sleeved with first springs 17. The two ends of the first spring 17 are fixedly connected with the outer wall of the push plate 15 and the inner end wall of the U-shaped member 14 respectively. The push plate 15 located in the middle has the longest moving distance under the pushing of the first spring 17, and the moving distances of the push plates 15 on the two sides gradually shorten. The end of the push plate 15 close to the abutting portion 10 pushes the inner wall of the rubber strip groove 11 under the elastic force of the first spring 17, so that the abutting portion 10 forms a relative triangular structure.

[0036] Specifically, the thrust mechanism comprises a receiving piece 12 and a receiving groove 13, the receiving piece 12 is arranged in the rubber strip groove 11, the U-shaped piece 14 in the receiving groove 13 limits the push plate 15, so that the push plate 15 can only slide along the inner wall of the U-shaped groove, and the first spring 17 pushes and extrudes the push plate 15 through the elastic force of itself, so that the push plate 15 pushes and extrudes the inner wall of the rubber strip groove 11, and in this process, the guide column 16 limits the first spring 17 and the push plate 15 to ensure the stability of the first spring 17 and the stability of the push plate 15 when moving, and the push plate 15 located in the middle moves the longest distance under the extrusion of the first spring 17, and the moving distance of the push plate 15 on both sides gradually shortens, so that the end portions of the push plate 15 are arranged in a triangular shape, so that the push plate 15 deforms and extends the inner wall of the rubber strip groove 11 to form a triangular structure.

[0037] Further, the inner wall of the receiving groove 13 is fixedly connected with a plurality of vibrating pipes 18, the vibrating pipes 18 and the push plate 15 are staggered, the inner wall of the vibrating pipe 18 is slidably connected with a vibrating column 19, the inner end wall of the vibrating pipe 18 is fixedly connected with a second spring 20, the two ends of the second spring 20 are respectively fixedly connected with one end of the vibrating column 19 located in the vibrating pipe 18 and the inner end wall of the vibrating pipe 18, the outer wall of the vibrating column 19 is provided with a recycling groove 21, the inner wall of the recycling groove 21 is fixedly connected with a plurality of guide rods 35, the outer wall of the guide rod 35 is sleeved with a fourth spring 36, one end of the fourth spring 36 is fixedly connected with the inner wall of the recycling groove 21, the other end of the fourth spring 36 is fixedly connected with a triangular linkage 22, the linkage 22 is penetrated by the guide rod 35 and is slidably connected with the guide rod 35, and the outer wall of the push plate 15 is fixedly connected with a pushing piece 23 for pushing and extruding the linkage 22.

[0038] Specifically, the plurality of rows of vibrating pipes 18 fixedly connected to the inner wall of the accommodation groove 13 limit the vibrating column 19, so that the vibrating column 19 can only move linearly along the vibrating pipe 18 reciprocatingly. When the push plate 15 moves, the push plate 15 will synchronously drive the abutting piece 23 fixedly connected to the outer wall of the push plate 15 to move. The abutting piece 23 will contact the linkage 22 during the movement, thereby pushing and extruding the linkage 22, so that the linkage 22 drives the vibrating column 19 to move to the inside of the vibrating pipe 18. With the movement of the vibrating column 19, the inclined bottom of the triangular linkage 22 will contact the top of the vibrating pipe 18. The linkage 22 can slide along the guide rod 35. At this time, with the continuous pushing and extruding of the abutting piece 23 to the linkage 22, the linkage 22 will start to slide along the guide rod 35 and move to the inside of the recovery groove 21. Until the linkage 22 no longer contacts the abutting piece 23, at this time the vibrating rod will start to reset quickly under the elastic force of the second spring 20, thereby impacting the inner wall of the rubber strip groove 11, so that the fitting part 10 vibrates, thereby making the fitting part 10 shake off the dirt and other impurities adhering to the surface thereof, further reducing the probability that the sealing performance is affected by the impurities.

[0039] Further, the outer wall of the vibrating pipe 18 is sleeved with the third spring 24, and the outer wall of the vibrating pipe 18 is slidingly connected with the unlocking pipe 25. The two ends of the third spring 24 are fixedly connected with the inner wall of the accommodation groove 13 and the outer wall of the unlocking pipe 25, respectively.

[0040] Specifically, the outer wall of the vibrating pipe 18 is sleeved with the third spring 24, and the outer wall of the vibrating pipe 18 is slidingly connected with the unlocking pipe 25. The two ends of the third spring 24 are fixedly connected with the inner wall of the accommodation groove 13 and the outer wall of the unlocking pipe 25, respectively.

[0041] Further, the unlocking pipes 25 in the same row gradually shorten the moving distance from one side to the other side under the pushing force of the third spring 24, forming a trapezoidal arrangement, and the trapezoidal arrangement directions of the unlocking pipes 25 in the adjacent two rows are oppositely arranged.

[0042] Specifically, the unlocking pipes 25 are arranged in a trapezoidal shape under the pushing force of the third springs 24, that is, the moving distance of the unlocking pipes 25 gradually decreases from one side to the other side, so that the linkage 22 first contacts the end of the unlocking pipe 25 with the longest moving distance when moving, and then the linkage 22 in the same column contacts the end of the unlocking pipe 25 in turn, so that the corresponding vibrating rod can hit the rubber strip groove 11 from one end one by one, so that the corresponding vibrating rod in the same column can hit the rubber strip groove 11 from different positions in one fitting process, thereby further increasing the effect of shaking off the dirt and the like.

[0043] Further, the outer wall of the vibrating column 19 is fixedly connected with the anti-escape ring 26 in the same horizontal line, and the linkage 22 is located between the anti-escape ring 26 and the vibrating pipe 18.

[0044] Specifically, the anti-escape ring 26 is arranged, so that the vibrating pipe 18 moves together with the anti-escape ring 26 when moving, the bottom of the anti-escape ring 26 can extrude the unlocking pipe 25 after contacting the end of the unlocking pipe 25, thereby moving the unlocking pipe 25 together, thereby preventing the linkage 22 from being stuck in the unlocking pipe 25 due to too long moving distance.

[0045] Further, the end of the push plate 15 close to the fitting part 10 is fixedly connected with the symmetrically arranged connecting plate 27, and the connecting plate 27 is provided with the abutting roller 28.

[0046] Specifically, the connecting plate 27 is arranged to connect the abutting roller 28, so that the push plate 15 no longer directly contacts the inner wall of the rubber strip groove 11, but supports the inner wall of the rubber strip groove 11 through the abutting roller 28, and the abutting roller 28 can rotate, so that the abutting roller 28 can rotate when the fitting part 10 is fitted and deformed, thereby ensuring the smoothness of the fitting part 10 when fitting, preventing the push plate 15 from being stuck with the inner wall of the rubber strip groove 11 and causing the fitting part 10 to be unable to fit.

[0047] Further, the top of the gate plate 7 is provided with the bracket 29, the bottom of the bracket 29 is fixedly connected with the top of the left valve body 1 and the right valve body 2 through bolts, the top of the gate plate 7 is fixedly connected with the connecting block 30, the top of the connecting block 30 is rotatably connected with the threaded rod 31, the other end of the threaded rod 31 penetrates through the bracket 29 and is threadedly connected therewith, and the end of the threaded rod 31 penetrating through the bracket 29 is further fixedly connected with the handle wheel 32.

[0048] Specifically, by rotating the handle wheel 32, the handle wheel 32 is rotated to drive the threaded rod 31 to rotate, and the threaded rod 31 is threadedly connected with the support 29, so that when the threaded rod 31 rotates, the threaded rod 31 moves and drives the connecting block 30 to move together, and the connecting block 30 is fixedly connected with the top of the gate plate 7, so that the connecting block 30 drives the gate plate 7 to move together, so as to conveniently adjust the gate plate 7.

[0049] Further, the outer wall of the abutting portion 10 at the second sealing rubber strip 8 is provided with a cut-off groove 33, the cut-off groove 33 is located in the middle of the abutting portion 10, and the cut-off groove 33 forms a semicircular structure when the abutting portion 10 forms a triangular structure.

[0050] Specifically, the cut-off groove 33 provided on the outer wall of the abutting portion 10 makes the abutting portion 10 at the second sealing rubber strip 8 first contact the cut-off groove 33 when moving to the abutting portion 10 at the first sealing rubber strip 6 for abutting, thereby achieving preliminary cutting of the medium, and when the abutting portion 10 deforms for abutting, the cut-off groove 33 will deform at this time, so that the two sides of the cut-off groove 33 approach each other, and in the process of approaching each other, the cut-off groove 33 scrapes the silt and other impurities at the abutting portion 10 at the second sealing rubber strip 8, thereby ensuring the cutting effect of the abutting portion 10 in the preliminary abutting, thereby reducing the probability of the problem that the preliminary cutting effect is affected by the silt and other impurities in the preliminary abutting, thereby affecting the abutting and sealing effect of the abutting portion 10.

[0051] Further, the inner wall of the sealing cavity 3 is fixedly connected with a plurality of third sealing rubber strips 34 arranged in sequence, and the inner surface of the third sealing rubber strip 34 is abutted with the outer wall of the gate plate 7.

[0052] Specifically, the third sealing effect is provided to seal the gap between the gate plate 7 and the sealing cavity 3, thereby preventing the medium from leaking from the upper side of the sealing cavity 3.

[0053] Working principle: the embodiment provides a two-piece knife type gate valve, the left valve body 1 and the right valve body 2 are fixedly connected through bolts, the medium channel 4 is communicated with the sealing cavity 3, then the medium channel 4 is connected with the pipeline for conveying medium, so that the flow of medium is realized, and when it is needed to cut off the flowing medium, the gate plate 7 is moved in the sealing cavity 3, so that the gate plate 7 drives the second sealing rubber strip 8 to move to the first sealing rubber strip 6, so that the first sealing rubber strip 6 and the abutting portion 10 on the second sealing rubber strip 8 are mutually abutted, the inner wall of the first sealing rubber strip 6 and the two side walls of the gate plate 7 are abutted, so that the gate plate 7 cuts off the sealing cavity 3, so that the medium cannot pass through the sealing cavity 3 any more, so that the cutting off of the medium is realized, and in the process, it needs to be paid attention that the thrust mechanism will push the inner wall of the rubber strip groove 11, so that the abutting portion 10 is deformed and extended to form a relative triangular structure, and in the process that the first sealing rubber strip 6 and the second sealing rubber strip 8 are mutually close, the middle portions of the abutting portion 10 will first contact, and along with the gradually abutting process of the abutting portion 10, the middle portions will first abut, so that the medium is preliminarily cut off, and at the same time, the thrust mechanism is pushed, the thrust mechanism starts to gradually release, so that the abutting portion 10 gradually abuts and restores to a plane, and in the process, since the abutting portion 10 is gradually deformed and abuts together in a triangular shape, the two sides of the abutting portion 10 will gradually push the medium, so that the medium gradually leaves the abutting portion 10, so that the medium drives the impurities such as silt to gradually leave, so that the probability that the sealing performance is affected due to impurities is reduced.

[0054] The embodiment of the application discloses the preferred embodiment, but is not limited to this, the person skilled in the art, easily understands the spirit of the application according to the above embodiment, and makes different inferences and changes, as long as not departing from the spirit of the application, all are within the protection scope of the application.

Claims

1. A two-piece knife gate valve, comprising a left valve body (1) and a right valve body (2) fixedly connected with the left valve body (1) by bolts, characterized in that, The right valve body (2) and the left valve body (1) are provided with a sealing cavity (3), the outer wall of the left valve body (1) and the right valve body (2) is provided with a rectangular medium channel (4) penetrating through and communicating with the sealing cavity (3), the inner wall of the sealing cavity (3) is fixedly connected with a first sealing rubber strip (6), the inside of the sealing cavity (3) is provided with a rectangular gate (7), the two sides of the gate (7) are respectively attached to the two side inner walls of the first sealing rubber strip (6), the bottom of the gate (7) is fixedly connected with a second sealing rubber strip (8), the top of the gate (7) penetrates through the top of the sealing cavity (3) to the outside thereof, and the gate (7) is sleeved with a limiting plate (9) outside the sealing cavity (3), the limiting plate (9) is fixedly connected with the top of the left valve body (1) and the right valve body (2) by bolts, the opposite side between the first sealing rubber strip (6) and the second sealing rubber strip (8) is formed with a corresponding attachment part (10), the bottom of the first sealing rubber strip (6) and the top of the second sealing rubber strip (8) are provided with rubber strip grooves (11), and the rubber strip grooves (11) are provided with a thrust mechanism for pushing the inner wall of the rubber strip groove (11). The thrust mechanism comprises receiving members (12) arranged in the rubber strip grooves (11) respectively, the side of the receiving member (12) close to the attachment part (10) is provided with a receiving groove (13), the two end inner walls of the receiving groove (13) are fixedly connected with a plurality of mutually symmetrical U-shaped members (14), the inner surfaces of the opposite two U-shaped members (14) are slidably connected with a push plate (15), the inner end walls of the U-shaped members (14) are fixedly connected with guide columns (16), the other ends of the guide columns (16) penetrate through the push plate (15) and are slidably connected with the push plate (15), the outer walls of the guide columns (16) are sleeved with first springs (17), the two ends of the first springs (17) are fixedly connected with the outer walls of the push plate (15) and the inner end walls of the U-shaped members (14) respectively, the push plate (15) located in the middle has the longest moving distance under the pushing of the first spring (17), the moving distances of the push plates (15) on both sides gradually shorten, and the end of the push plate (15) close to the attachment part (10) pushes the inner wall of the rubber strip groove (11) under the elastic force of the first spring (17) to form a triangular structure of the attachment part (10).

2. A two-piece knife gate valve according to claim 1, characterized in that The inner wall of the accommodating groove (13) is fixedly connected with a plurality of vibrating pipes (18), the vibrating pipes (18) and the push plate (15) are staggered, the inner wall of the vibrating pipe (18) is slidably connected with a vibrating column (19), the inner end wall of the vibrating pipe (18) is fixedly connected with a second spring (20), the two ends of the second spring (20) are respectively fixedly connected with one end of the vibrating column (19) inside the vibrating pipe (18) and the inner end wall of the vibrating pipe (18), the outer wall of the vibrating column (19) is provided with a recycling groove (21), the inner wall of the recycling groove (21) is fixedly connected with a plurality of guide rods (35), the outer wall of the guide rod (35) is sleeved with a fourth spring (36), one end of the fourth spring (36) is fixedly connected with the inner wall of the recycling groove (21), the other end of the fourth spring (36) is fixedly connected with a triangular linkage (22), the linkage (22) is penetrated by the guide rod (35) and is slidably connected with the guide rod (35), and the outer wall of the push plate (15) is fixedly connected with a pushing piece (23) for pushing the linkage (22).

3. A two-piece knife gate valve according to claim 2, wherein, The outer wall of the vibrating pipe (18) is sleeved with a third spring (24), and the outer wall of the vibrating pipe (18) is slidably connected with an unlocking pipe (25). The two ends of the third spring (24) are fixedly connected with the inner wall of the accommodating groove (13) and the outer wall of the unlocking pipe (25).

4. A two-piece knife gate valve according to claim 3, wherein, The unlocking pipes (25) in the same column gradually shorten the moving distance from one side to the other under the thrust of the third spring (24) to form a trapezoidal arrangement, and the trapezoidal arrangement directions of the unlocking pipes (25) in the adjacent two columns are oppositely arranged.

5. A two-piece knife gate valve according to claim 2, wherein The outer wall of the vibrating column (19) is fixedly connected with a anti-drop ring (26) in the same horizontal line, and the linkage (22) is located between the anti-drop ring (26) and the vibrating pipe (18).

6. A two-piece knife gate valve as defined in claim 1, wherein, The end of the push plate (15) close to the fitting part (10) is fixedly connected with a symmetrically arranged connecting plate (27), and a resisting roller (28) is arranged between the connecting plates (27). The two ends of the resisting roller (28) are rotatably connected with the opposite sides of the connecting plates (27).

7. A two-piece knife gate valve as defined in claim 1, wherein, The top of the gate plate (7) is provided with a support (29), the bottom of the support (29) is fixedly connected with the top of the left valve body (1) and the right valve body (2) through bolts, the top of the gate plate (7) is fixedly connected with a connecting block (30), the top of the connecting block (30) is rotatably connected with a threaded rod (31), the other end of the threaded rod (31) penetrates through the support (29) and is threadedly connected with the support (29), and the end of the threaded rod (31) penetrating through the support (29) is further fixedly connected with a handle wheel (32).

8. A two-piece knife gate valve as defined in claim 1, wherein, The outer wall of the fitting part (10) at the second sealing rubber strip (8) is provided with a cut-off groove (33), the cut-off groove (33) is located in the middle of the fitting part (10), and the cut-off groove (33) forms a semicircular structure when the fitting part (10) forms a triangular structure.

9. A two-piece knife gate valve as defined in claim 1, wherein, The inner wall of the sealing cavity (3) is fixedly connected with a plurality of third sealing rubber strips (34) arranged in sequence, and the inner surface of the third sealing rubber strip (34) is attached to the outer wall of the shutter (7).

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