Two-piece type knife-shaped gate valve

Abstract

The invention discloses a two-piece type knife-shaped gate valve, relates to the technical field of knife-shaped gate valves, and aims to solve the problem that in the prior art, when a gate plate is attached to a sealing strip, impurities such as silt are retained between the gate plate and the sealing strip, and the sealing effect is affected. The two-piece type knife-shaped gate valve comprises a left valve body and a right valve body fixedly connected with the left valve body through a bolt; a sealing cavity is formed between the right valve body and the left valve body, rectangular medium channels which penetrate through the left valve body and the right valve body and are communicated with the sealing cavity are formed in the outer wall of the left valve body and the outer wall of the right valve body, a first sealing rubber strip is fixedly connected to the inner wall of the sealing cavity, and a rectangular gate plate is arranged in the sealing cavity; the two sides of the gate plate are attached to the inner walls of the two sides of the first sealing rubber strip respectively. The gate valve has the advantage that the probability that the sealing performance of the gate valve is affected due to impurities is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of knife-type gate valves, and more particularly to a two-piece knife-type gate valve. Background Art

[0002] Knife-type gate valves, as important flow regulating and shut-off devices, are widely used in many pipelines such as tap water, sewage, construction, petroleum, chemical industry, food, medicine, textile, electricity, shipbuilding, metallurgy, and energy systems.

[0003] Traditional knife-type gate valves typically use a gate disc and a sealing strip to achieve a seal. With this structure, when the knife-type gate valve is used to transport media containing impurities such as silt, the medium containing impurities such as silt and sand is in a flowing state during the process of the gate disc fitting against the sealing strip. Some impurities will flow with the medium and be trapped between the gate disc and the sealing strip just as they are about to fit together. This affects the fit between the gate disc and the sealing strip, thus affecting the sealing effect of the gate valve and easily causing leakage. In view of this, we propose a two-piece knife-type gate valve. Summary of the Invention

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

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a two-piece knife-type 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 provided between the right valve body and the left valve body, the outer walls of the left valve body and the right valve body are provided with a rectangular medium channel penetrating therethrough and communicating with the sealing cavity, the inner wall of the sealing cavity is fixedly connected to a first sealing strip, a rectangular gate is provided inside the sealing cavity, the two sides of the gate are respectively fitted with the inner walls of the two sides of the first sealing strip, and the bottom of the gate is fixed A second sealing strip is connected, the top of the gate plate passes through the top of the sealing cavity to its outside, and the gate plate is provided with a limit plate at the outside of the sealing cavity, and the limit plates are fixedly connected to the tops of the left valve body and the right valve body respectively by bolts, and the first sealing strip and the second sealing strip are formed with corresponding fitting parts on the opposite sides, and the bottom of the first sealing strip and the top of the second sealing strip are provided with strip grooves, and the strip grooves are provided with thrust mechanisms for pushing the inner walls of the strip grooves.

[0006] The cam is secured to the rear of the U-shaped member so that the cam can slide back and forth, and the push plates can slide in and out of the recesses of the U-shaped member so that the cam can slide back and forth.

[0007] Preferably, the inner wall of the storage groove is fixedly connected with multiple rows of vibrating tubes, the vibrating tubes and the push plates are staggered, the inner walls of the vibrating tubes are slidably connected with vibrating columns, the inner end walls of the vibrating tubes are fixedly connected with a second spring, the two ends of the second spring are respectively fixedly connected to one end of the vibrating column located inside the vibrating tube and the inner end wall of the vibrating tube, the outer wall of the vibrating column is provided with a recovery groove, the inner wall of the recovery groove is fixedly connected with multiple guide rods, the outer walls of the guide rods are each sleeved with a fourth spring, one end of the fourth spring is fixedly connected to the inner wall of the recovery groove, the other end of the fourth spring is fixedly connected to a triangular linkage part, the linkage part is penetrated by the guide rod and slidably connected thereto, and the outer wall of the push plate is fixedly connected with a pushing part for pushing the linkage part.

[0008] Preferably, the outer wall of the vibrating tube is sleeved with a third spring, the outer wall of the vibrating tube is slidably connected to an unlocking tube, and the two ends of the third spring are fixedly connected to the inner wall of the receiving groove and the outer wall of the unlocking tube respectively.

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

[0010] Preferably, the outer walls of the vibrating columns are fixedly connected with anti-slip rings on the same horizontal line, and the linkage parts are located between the anti-slip rings and the vibrating tubes.

[0011] Preferably, one end of the push plate close to the fitting portion is fixedly connected to a symmetrically arranged connecting plate, and abutment rollers are provided between the connecting plates, and both ends of the abutment rollers are rotatably connected to the opposite sides of the connecting plates.

[0012] Preferably, a bracket is provided on the top of the gate plate, and the bottom of the bracket is fixedly connected to the top of the left valve body and the right valve body respectively by bolts. The top of the gate plate is fixedly connected to a connecting block, and the top of the connecting block is rotatably connected to a threaded rod, and the other end of the threaded rod passes through the bracket and is threadedly connected to it, and one end of the threaded rod passing through the bracket is also fixedly connected to a handle wheel.

[0013] Preferably, an intercepting groove is provided on the outer wall of the fitting portion located at the second sealing strip. The intercepting groove is located in the middle of the fitting portion, and the intercepting groove forms a semicircular structure when the fitting portion forms a triangular structure.

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

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a left valve body, a right valve body, a sealing cavity, a medium channel, a first sealing strip, a gate plate, a second sealing strip, a limit plate, a fitting portion, a strip groove and a thrust mechanism, so that the fitting portion gradually fits together and returns to a plane. In this process, since the fitting portion is gradually deformed from a triangle and fitted together, the two sides of the fitting portion will gradually push the medium, causing the medium to gradually leave between the fitting portions, so that the medium drives impurities such as mud and sand to gradually leave, thereby reducing the probability of the sealing being affected by impurities.

[0016] 2. The present invention limits the vibrating column through multiple rows of vibrating tubes fixedly connected to the inner wall of the storage groove, so that the vibrating column can only move back and forth in a straight line along the vibrating tube, and then the vibrating rod begins to quickly reset under the elastic force of the second spring, thereby impacting the inner wall of the rubber strip groove, thereby causing the fitting part to vibrate, so that the fitting part can shake off impurities such as mud and sand adhering to its surface, further reducing the probability of the sealing being affected by impurities.

[0017] 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.

[0018] 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

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 This is a schematic diagram of the disassembly structure of the right valve body in the present invention; Figure 3 is a cross-sectional view of the left valve body in the present invention; Figure 4 A first cross-sectional view of the storage element of the present invention; Figure 5 A second cross-sectional view of the storage member of the present invention; Figure 6 A cross-sectional view of the vibrating tube of the present invention; Figure 7 for Figure 3 A local enlarged view of point A in FIG; Figure 8 for Figure 4 A local enlarged view of point B in FIG; Figure 9 for Figure 6 A partial enlarged view of point C in the figure.

[0020] Description of the numbers in the figure: 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

[0021] 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.

[0022] Example 1 like Figure 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.

[0023] 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 chamber 3, and then the pipeline for conveying the medium is connected through the medium channel 4, so as to realize the circulation of the medium. When it is necessary to cut off the circulating medium, the gate plate 7 is moved in the sealing chamber 3, so that the gate plate 7 drives the second sealing strip 8 to move toward the first sealing strip 6, so that the first sealing strip 6 and the fitting parts 10 on the second sealing strip 8 fit each other, and the inner wall of the first sealing strip 6 fits the outer walls on both sides of the gate plate 7, so that the gate plate 7 cuts off the sealing chamber 3, so that the medium can no longer pass through the sealing chamber 3, thereby realizing the cutoff of the medium. It should be noted that in the process again, the thrust mechanism will push the inner wall of the strip groove 11, so that The fitting portion 10 is deformed and extended to form a relative triangular structure. In the process of the first sealing strip 6 and the second sealing strip 8 approaching each other, the middle parts of the fitting portion 10 will first contact each other, and as the fitting portion 10 gradually fits together, the middle part will fit first, thereby initially cutting off the medium. At the same time, the thrust mechanism is subjected to a pushing force, and the thrust mechanism begins to gradually release, so that the fitting portion 10 gradually fits together and returns to a plane. In this process, since the fitting portion 10 is gradually deformed and fitted together from a triangle, the two sides of the fitting portion 10 will gradually push the medium, so that the medium gradually leaves between the fitting portions 10, so that the medium drives impurities such as mud and sand to gradually leave, thereby reducing the probability of the sealing being affected by impurities.

[0024] The push plate 15 at the middle position moves the longest distance under the push of the first spring 17, and the moving distance of the push plates 15 on both sides thereof gradually shortens. The end of the push plate 15 close to the fitting portion 10 pushes the inner wall of the strip groove 11 under the elastic force of the first spring 17 so that the fitting portion 10 forms a relative triangular structure.

[0025] Specifically, the thrust mechanism includes a storage part 12 and a storage groove 13. The storage part 12 is arranged in the rubber strip groove 11. The U-shaped part 14 in the storage 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. The first spring 17 pushes the push plate 15 through its own elastic force, so that the push plate 15 pushes the inner wall of the rubber strip groove 11. 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. The push plate 15 located in the middle moves the longest distance under the push of the first spring 17, and the moving distance of the push plates 15 on both sides gradually shortens, so that the ends of the push plate 15 are arranged in a triangle, so that when the push plate 15 pushes the inner wall of the rubber strip groove 11, the fitting part 10 is deformed and extended to form a triangular structure.

[0026] Furthermore, the inner wall of the storage groove 13 is fixedly connected with multiple rows of vibrating tubes 18, which are staggered between the vibrating tubes 18 and the push plate 15. The inner walls of the vibrating tubes 18 are slidably connected with vibrating columns 19, and the inner end walls of the vibrating tubes 18 are fixedly connected with second springs 20. The two ends of the second spring 20 are respectively fixedly connected to one end of the vibrating column 19 located inside the vibrating tube 18 and the inner end wall of the vibrating tube 18. A recovery groove 21 is opened on the outer wall of the vibrating column 19, and a plurality of guide rods 35 are fixedly connected to the inner wall of the recovery groove 21. The outer walls of the guide rods 35 are each sleeved with a fourth spring 36, one end of the fourth spring 36 is fixedly connected to the inner wall of the recovery groove 21, and the other end of the fourth spring 36 is fixedly connected to a triangular linkage part 22. The linkage part 22 is penetrated by the guide rod 35 and is slidably connected thereto, and the outer wall of the push plate 15 is fixedly connected with a pushing part 23 for pushing the linkage part 22.

[0027] Specifically, the multiple rows of vibrating tubes 18 fixedly connected to the inner wall of the storage groove 13 limit the vibrating column 19, so that the vibrating column 19 can only move back and forth in a straight line along the vibrating tube 18. When the push plate 15 moves, the push plate 15 will synchronously drive the push piece 23 fixedly connected to its outer wall to move together. The push piece 23 will contact the linkage piece 22 during the movement, thereby pushing the linkage piece 22, so that the linkage piece 22 drives the vibrating column 19 to move toward the inside of the vibrating tube 18. As the vibrating column 19 moves, the inclined bottom of the triangular linkage piece 22 will contact the top of the vibrating tube 18 The linkage part 22 can slide along the guide rod 35. At this time, as the push member 23 continues to push the linkage part 22, the linkage part 22 will begin to slide along the guide rod 35 toward the inside of the recovery groove 21 until the linkage part 22 is no longer in contact with the push member 23. At this time, the vibrating rod will begin to quickly reset under the elastic force of the second spring 20, thereby hitting the inner wall of the rubber strip groove 11, thereby causing the fitting part 10 to vibrate, so that the fitting part 10 can shake off impurities such as mud and sand adhering to its surface, further reducing the probability of the sealing being affected by impurities.

[0028] Furthermore, the outer wall of the vibrating tube 18 is sleeved with a third spring 24, and the outer wall of the vibrating tube 18 is slidably connected to an unlocking tube 25. The two ends of the third spring 24 are fixedly connected to the inner wall of the receiving groove 13 and the outer wall of the unlocking tube 25 respectively.

[0029] Specifically, the outer wall of the vibrating tube 18 is sleeved with a third spring 24, which supports the unlocking tube 25, and the end of the unlocking tube 25 pushes the linkage part 22, so that the linkage part 22 moves into the recovery groove 21, thereby changing the rebound distance of the vibrating rod when it rebounds and hits the rubber strip groove 11, and achieving a vibration effect on the bonding part 10 in different bonding states when the bonding part 10 is bonded, thereby further reducing the probability of its sealing being affected by impurities.

[0030] Furthermore, under the thrust of the third spring 24 , the unlocking tubes 25 in the same column move in a distance that is gradually shortened from one side to the other to form a trapezoidal arrangement, and the trapezoidal arrangement directions of the unlocking tubes 25 in two adjacent columns are opposite.

[0031] Specifically, under the thrust of the third spring 24, the moving distance of the unlocking tube 25 gradually shortens from one side to the other side to form a trapezoidal arrangement, which makes the linkage part 22 contact with the end of the unlocking tube 25 with the longest moving distance first when moving, and then the linkage parts 22 in the same column contact with the ends of the corresponding unlocking tubes 25 in turn, so that the corresponding vibrating rods can hit the rubber strip groove 11 one by one from one end, so that the bonding part 10 can be subjected to the impact and vibration effect of the same column vibrating rods 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 25 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 11 from both sides in turn, thereby further increasing the effect of shaking off impurities such as mud and sand.

[0032] Furthermore, the outer walls of the vibrating columns 19 are fixedly connected with anti-slip rings 26 on the same horizontal line, and the linkage member 22 is located between the anti-slip rings 26 and the vibrating tube 18 .

[0033] Specifically, by setting the anti-slip ring 26, the vibrating tube 18 will drive the anti-slip ring 26 to move together when it moves, so that after the bottom of the anti-slip ring 26 contacts the end of the unlocking tube 25, it can squeeze the unlocking tube 25, thereby driving the unlocking tube 25 to move together, thereby preventing the linkage part 22 from moving too long in the unlocking tube 25, causing the linkage part 22 and the unlocking tube 25 to be stuck.

[0034] Furthermore, one end of the push plate 15 close to the fitting portion 10 is fixedly connected to a symmetrically arranged connecting plate 27 , and abutment rollers 28 are provided between the connecting plates 27 , and both ends of the abutment rollers 28 are rotatably connected to the opposite sides of the connecting plates 27 .

[0035] Specifically, the connecting plate 27 is provided to connect the resisting roller 28, so that the push plate 15 is no longer in direct contact with the inner wall of the rubber strip groove 11, but supports the inner wall of the rubber strip groove 11 through the resisting roller 28. The resisting roller 28 is rotatable, so when the bonding part 10 is deformed by bonding, the resisting roller 28 can rotate to ensure the smoothness of the bonding part 10 during bonding, and prevent the push plate 15 from being stuck with the inner wall of the rubber strip groove 11, resulting in the bonding part 10 being unable to bond.

[0036] Furthermore, a bracket 29 is provided on the top of the gate plate 7, and the bottom of the bracket 29 is fixedly connected to the top of the left valve body 1 and the right valve body 2 respectively by bolts. The top of the gate plate 7 is fixedly connected to a connecting block 30, and the top of the connecting block 30 is rotatably connected to a threaded rod 31. The other end of the threaded rod 31 passes through the bracket 29 and is threadedly connected thereto, and one end of the threaded rod 31 passing through the bracket 29 is also fixedly connected to a handle wheel 32.

[0037] Specifically, by rotating the handle wheel 32, the handle wheel 32 rotates and drives the threaded rod 31 to rotate. The threaded rod 31 is threadedly connected to the bracket 29, so when the threaded rod 31 rotates, the threaded rod 31 will move and drive the connecting block 30 to move together. The connecting block 30 is fixedly connected to the top of the gate plate 7, so the connecting block 30 will drive the gate plate 7 to move together, thereby realizing convenient adjustment of the gate plate 7.

[0038] Furthermore, an intercepting groove 33 is formed on the outer wall of the fitting portion 10 at the second sealing strip 8. The intercepting groove 33 is located in the middle of the fitting portion 10 and forms a semicircular structure when the fitting portion 10 forms a triangular structure.

[0039] Specifically, the intercepting groove 33 provided on the outer wall of the fitting portion 10 enables the intercepting groove 33 to first contact the fitting portion 10 at the second sealing strip 8 when the fitting portion 10 at the second sealing strip 8 moves toward the fitting portion 10 at the first sealing strip 6 and fits, thereby achieving preliminary cutoff of the medium. When the fitting portion 10 is deformed and fitted, the intercepting groove 33 will begin to deform, thereby making the two sides of the intercepting groove 33 approach each other, and in the process of approaching each other, the mud and sand and other impurities at the fitting portion 10 at the second sealing strip 8 are scratched, thereby ensuring the intercepting effect of the fitting portion 10 during the initial fitting, thereby reducing the probability of the fitting portion 10 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 10.

[0040] Furthermore, a plurality of third sealing strips 34 arranged in sequence are fixedly connected to the inner wall of the sealing cavity 3 , and the inner surface of the third sealing strips 34 is in contact with the outer wall of the gate plate 7 .

[0041] Specifically, the gap between the gate plate 7 and the sealing cavity 3 is sealed by the third sealing effect, thereby preventing the medium from leaking from the upper side of the sealing cavity 3 .

[0042] Working principle: This embodiment provides a two-piece knife-type gate valve, in which the left valve body 1 and the right valve body 2 are fixedly connected by bolts, the medium channel 4 is connected to the sealing chamber 3, and then the pipeline for conveying the medium is connected through the medium channel 4, so as to realize the circulation of the medium. When it is necessary to cut off the circulating medium, the gate plate 7 is moved in the sealing chamber 3, so that the gate plate 7 drives the second sealing strip 8 to move toward the first sealing strip 6, so that the first sealing strip 6 and the fitting parts 10 on the second sealing strip 8 fit each other, and the inner wall of the first sealing strip 6 fits the outer walls on both sides of the gate plate 7, so that the gate plate 7 cuts off the sealing chamber 3, so that the medium can no longer pass through the sealing chamber 3, thereby realizing the cutoff of the medium. It should be noted that in the process again, the thrust mechanism will push the strip groove 11 The inner wall is pushed, so that the fitting part 10 is deformed and extended to form a relative triangular structure. In the process of the first sealing strip 6 and the second sealing strip 8 approaching each other, the middle parts of the fitting part 10 will be in contact first, and as the fitting part 10 gradually fits together, the middle part will fit first, thereby initially cutting off the medium. At the same time, the thrust mechanism is subjected to the pushing force, and the thrust mechanism begins to be gradually released, so that the fitting part 10 gradually fits together and returns to a plane. In this process, since the fitting part 10 is gradually deformed and fitted together from a triangle, the two sides of the fitting part 10 will gradually push the medium, so that the medium gradually leaves between the fitting parts 10, so that the medium drives impurities such as mud and sand to gradually leave, thereby reducing the probability of the sealing being affected by impurities.

[0043] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A two-piece knife-type gate valve, comprising a left valve body (1) and a right valve body (2) fixedly connected to the left valve body by bolts, characterized in that: A sealing cavity (3) is provided between the right valve body (2) and the left valve body (1), and the outer walls of the left valve body (1) and the right valve body (2) are both provided with rectangular medium channels (4) penetrating therethrough and communicating with the sealing cavity (3). The inner wall of the sealing cavity (3) is fixedly connected with a first sealing strip (6), and a rectangular gate (7) is provided inside the sealing cavity (3). Both sides of the gate (7) are respectively fitted with the inner walls of both sides of the first sealing strip (6), and the bottom of the gate (7) is fixedly connected with a second sealing strip (8), and the top of the gate (7) passes through the top of the sealing cavity (3). The gate (7) is located outside the sealing cavity (3) and is provided with a limit plate (9), the limit plate (9) being fixedly connected to the top of the left valve body (1) and the top of the right valve body (2) by bolts, respectively. The first sealing strip (6) and the second sealing strip (8) are provided with corresponding fitting portions (10) on opposite sides thereof, 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 a thrust mechanism for pushing the inner wall of the strip groove (11) is provided in the strip groove (11).

2. A two-piece knife-type gate valve according to claim 1, characterized in that: The thrust mechanism includes a receiving member (12) respectively arranged inside the rubber strip groove (11), a receiving groove (13) is provided on one side of the receiving member (12) close to the fitting portion (10), a plurality of mutually symmetrical U-shaped members (14) are fixedly connected to the inner walls at both ends of the receiving groove (13), a push plate (15) is slidably connected to the inner surfaces of the two opposite U-shaped members (14), a guide column (16) is fixedly connected to the inner end wall of the U-shaped member (14), the other end of the guide column (16) passes through the push plate (15) and is slidably connected thereto, and the guide column (16) 6) are sleeved with a first spring (17), and the two ends of the first spring (17) are fixedly connected to 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 moves the longest distance under the push of the first spring (17), and the moving distances of the push plates (15) on both sides thereof are gradually shortened. The end of the push plate (15) close to the fitting part (10) pushes the inner wall of the rubber strip groove (11) under the elastic force of the first spring (17) so that the fitting part (10) forms a relative triangular structure.

3. A two-piece knife-type gate valve according to claim 2, characterized in that: The inner wall of the receiving groove (13) is fixedly connected with a plurality of rows of vibrating tubes (18), the vibrating tubes (18) and the push plate (15) are arranged in a staggered manner, the inner wall of the vibrating tube (18) is slidably connected with a vibrating column (19), the inner end wall of the vibrating tube (18) is fixedly connected with a second spring (20), the two ends of the second spring (20) are respectively fixedly connected to one end of the vibrating column (19) located inside the vibrating tube (18) and the inner end wall of the vibrating tube (18), and the outer wall of the vibrating column (19) is provided with a recovery groove (2 1), the inner wall of the recovery groove (21) is fixedly connected to a plurality of guide rods (35), the outer walls of the guide rods (35) are sleeved with a fourth spring (36), one end of the fourth spring (36) is fixedly connected to the inner wall of the recovery groove (21), the other end of the fourth spring (36) is fixedly connected to a triangular linkage member (22), the linkage member (22) is penetrated by the guide rods (35) and is slidably connected thereto, and the outer wall of the push plate (15) is fixedly connected to a push member (23) for pushing the linkage member (22).

4. A two-piece knife-type gate valve according to claim 3, characterized in that: The outer wall of the vibrating tube (18) is sleeved with a third spring (24), the outer wall of the vibrating tube (18) is slidably connected to an unlocking tube (25), and the two ends of the third spring (24) are fixedly connected to the inner wall of the receiving groove (13) and the outer wall of the unlocking tube (25), respectively.

5. A two-piece knife-type gate valve according to claim 4, characterized in that: Under the thrust of the third spring (24), the unlocking tubes (25) in the same column have their moving distances gradually shortened from one side to the other to form a trapezoidal arrangement, and the trapezoidal arrangement directions of the unlocking tubes (25) in two adjacent columns are opposite.

6. A two-piece knife-type gate valve according to claim 3, characterized in that: The outer walls of the vibrating columns (19) are fixedly connected with anti-slip rings (26) located on the same horizontal line, and the linkage member (22) is located between the anti-slip rings (26) and the vibrating tube (18).

7. A two-piece knife-type gate valve according to claim 2, characterized in that: One end of the push plate (15) close to the fitting portion (10) is fixedly connected to a symmetrically arranged connecting plate (27), and a contact roller (28) is provided between the connecting plates (27). Both ends of the contact roller (28) are rotatably connected to the opposite side of the connecting plates (27).

8. A two-piece knife-type gate valve according to claim 1, characterized in that: A bracket (29) is provided on the top of the gate plate (7), and the bottom of the bracket (29) is fixedly connected to the top of the left valve body (1) and the top of the right valve body (2) by bolts respectively. The top of the gate plate (7) is fixedly connected to a connecting block (30), and the top of the connecting block (30) is rotatably connected to a threaded rod (31), and the other end of the threaded rod (31) passes through the bracket (29) and is threadedly connected thereto, and one end of the threaded rod (31) passing through the bracket (29) is also fixedly connected to a handle wheel (32).

9. A two-piece knife-type gate valve according to claim 2, characterized in that: An intercepting groove (33) is provided on the outer wall of the fitting portion (10) at the second sealing strip (8), the intercepting groove (33) is located in the middle of the fitting portion (10), and the intercepting groove (33) forms a semicircular structure when the fitting portion (10) forms a triangular structure.

10. A two-piece knife-type gate valve according to claim 1, characterized in that: A plurality of sequentially arranged third sealing strips (34) are fixedly connected to the inner wall of the sealing cavity (3), and the inner surface of the third sealing strips (34) is in contact with the outer wall of the gate plate (7).

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