A gate valve and a control method of a gate valve

Abstract

This invention discloses a gate valve and a control method for the gate valve, relating to the field of gate valve technology. The invention includes a valve body with a top cover fixedly connected to its surface, and a valve frame fixedly connected to the top of the top cover; a valve stem rotatably connected to the valve frame and extending downwards through the valve body; two valve plates, each located on one side of the valve stem for sealing the valve body; two fixed valve seats, fixedly connected to both sides of the valve body, each with a concave push ring at its adjacent end; two sets of elastic components, each positioned between the two fixed valve seats and the two concave push rings to drive the two concave push rings to adhere to the two valve plates; and two sets of air-filled sealing mechanisms, each positioned between the two fixed valve seats and the two concave push rings for sealing between the two concave push rings and the two valve plates. This invention increases the sealing performance of the valve plates, thereby preventing water leakage after the valve is sealed.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of gate valves, in particular to a gate valve and a control method of the gate valve. BACKGROUND

[0002] The gate valve seals through the contact between the valve seat and the gate plate, and the sealing surface is usually built up with metal material to increase wear resistance, such as 1Cr13, STL6, stainless steel, etc. The gate plate has rigid gate plate and elastic gate plate, and the gate valve is divided into rigid gate valve and elastic gate valve according to the gate plate.

[0003] The existing gate valve has poor sealing between the valve plate and the valve body in use, and water seepage still occurs when the valve is closed, which affects the normal use of the gate valve and greatly shortens the service life of the valve. SUMMARY

[0004] The purpose of the present application is to provide a gate valve and a control method and use method of the gate valve, which realizes the increase of the sealing of the valve plate, thereby achieving the technical effect of avoiding water outflow after the valve is sealed, and solving the existing technical problems.

[0005] To solve the above technical problems, the present application is realized by the following technical scheme:

[0006] A gate valve, comprising a valve body, an upper cover fixedly connected to the surface of the valve body, and a valve frame fixedly connected to the top end of the upper cover; a valve rod rotatably connected in the valve frame and downwardly movable to penetrate into the valve body; two valve plates respectively arranged on the two sides of the valve rod to seal the valve body; two fixed valve seats fixedly connected to the two sides in the valve body, and the end portions of the two fixed valve seats close to each other are provided with recessed push rings; two groups of elastic components respectively arranged between the two fixed valve seats and the two recessed push rings to drive the two recessed push rings to adhere to the two valve plates; two groups of inflation sealing mechanisms respectively arranged between the two fixed valve seats and the two recessed push rings to seal between the two recessed push rings and the two valve plates; a pressing mechanism arranged between the valve rod and the two valve plates to drive the valve plate to adhere to the two recessed push rings outwardly; and a gear drive mechanism arranged in the valve rod to drive the pressing mechanism to move.

[0007] Optionally, each group of the elastic components comprises a plurality of second grooves opened in the fixed valve seat, a first sliding plate slidably connected in each of the second grooves, a first connecting rod fixedly connected to the side end of each of the first sliding plates, the recessed push ring fixedly connected to the side end of the plurality of first connecting rods, a first spring fixedly connected to the side end of each of the first sliding plates, and the first spring fixedly connected in each of the second grooves.

[0008] Optionally, the inflation sealing mechanism comprises a rubber inflation ring arranged at the side end of the concave push ring, a communication pipe fixedly connected in the concave push ring and communicated with the rubber inflation ring, a communication groove arranged in the valve body and the fixed valve seat, the side end of the communication pipe fixedly connected to the fixed valve seat communicated with the communication groove, an air chamber arranged in the valve body communicated with the communication groove, a second sliding plate slidingly connected in the air chamber, a piston fixedly connected to the side end of the second sliding plate, a second connecting rod fixedly connected to the other end of the second sliding plate, a fifth groove arranged in the valve body, the second connecting rod outwardly and movably penetrating into the fifth groove, an arc-shaped extrusion plate fixedly connected to the side end of the second connecting rod, a valve rod downwardly and movably penetrating into the fifth groove, a rhombic extrusion block fixedly connected to the surface of the valve rod, the surface of the rhombic extrusion block in contact with the surface of the arc-shaped extrusion plate, a second spring fixedly connected to the side end of the arc-shaped extrusion plate, and the side end of the second spring fixedly connected in the fifth groove, the second spring sleeved on the circumferential surface of the second connecting rod.

[0009] Optionally, the extrusion mechanism comprises a connecting plate fixedly connected to the circumferential surface of the valve rod, a fourth groove arranged in the connecting plate, two trapezoidal extrusion blocks slidingly connected in the fourth groove, the two trapezoidal extrusion blocks fixedly connected to the end portions close to each other of the two valve plates respectively, a third groove arranged in the connecting plate communicated with the fourth groove, an extrusion plate slidingly connected in the third groove, a drive screw rotatably connected in the third groove, the extrusion plate threadedly connected to the circumferential surface of the drive screw, the inclined surfaces of the two trapezoidal extrusion blocks in contact with the extrusion plate, and the end portions close to each other of the two trapezoidal extrusion blocks each arranged with a containing groove, and a tension spring fixedly connected in the two containing grooves.

[0010] Optionally, the drive screw is a reciprocating screw.

[0011] Optionally, the gear drive mechanism comprises a first groove arranged in the valve rod, the drive screw upwardly and movably penetrating into the first groove, a driven gear fixedly connected to the circumferential surface of the drive screw, a driving gear rotatably connected in the first groove engaged with the driven gear, and a tooth ring fixedly connected to the top end of the valve frame engaged with the driving gear.

[0012] Optionally, the top end of the circumferential surface of the valve rod is fixedly connected with a hand wheel.

[0013] A gate valve control method of a gate valve, comprising the following steps:

[0014] S1. When the valve needs to be closed, the valve stem is rotated by turning the handwheel. The rotation of the valve stem causes the connecting plate to rotate, which in turn causes the two valve plates to rotate and close. The rotation of the valve stem causes the drive gear to rotate in a circular motion. When the drive gear rotates in a circular motion, it meshes with the gear ring. The gear ring drives the drive gear to rotate, which in turn drives the driven gear and the drive screw to rotate. The drive screw rotates and causes the extrusion plate to move downward. When the extrusion plate moves downward, it enters the fourth groove. The extrusion plate extrudes the inclined surfaces of the two trapezoidal extrusion blocks. The two trapezoidal extrusion blocks move in opposite directions. The movement of the trapezoidal extrusion blocks in opposite directions stretches the tension spring. The two trapezoidal extrusion blocks drive the two valve plates to move outward and press against the two concave push rings respectively. With the elasticity of the first spring, the concave push rings and valve plates are pushed to fit tightly together to improve the sealing of the pipeline.

[0015] S2. When opening the valve, turn the handwheel 90°. When the handwheel is turned, the valve stem rotates. The valve stem rotates, which in turn rotates the connecting plate. The connecting plate rotates, which in turn rotates the two valve plates to close. The valve stem rotates, which in turn rotates the drive gear. When the drive gear rotates, it meshes with the gear ring. The gear ring drives the drive gear to rotate. The drive gear rotates, which in turn rotates the driven gear and the drive screw. The drive screw rotates again, which causes the extrusion plate to return downwards to the third groove.

[0016] S3. When closing the valve, the valve stem is rotated by turning the handwheel. At the same time, the valve stem rotates and drives the diamond-shaped extrusion block to rotate. The rotation of the diamond-shaped extrusion block will squeeze the arc-shaped extrusion plate through its two longer ends. The two arc-shaped extrusion plates move in opposite directions. The extrusion of the arc-shaped extrusion plates drives the second connecting rod to move inward. The second connecting rod drives the second slide plate and piston to squeeze the air in the air chamber. The air in the air chamber enters the rubber inflation ring through the connecting groove and connecting pipe, inflating the rubber inflation ring. The rubber inflation ring is inflated to fill the gap between the concave push ring and the valve plate, increasing the valve's sealing performance.

[0017] S4. When the valve is opened, the compression at the longer ends of the two diamond-shaped extrusion blocks is lost. The arc-shaped extrusion plate is pushed back to its original position by the elasticity of the second spring. The arc-shaped extrusion plate drives the second slide plate and piston to move in the air chamber through the second connecting rod. The piston draws air from the rubber inflation ring through the connecting groove and connecting pipe.

[0018] The embodiments of the present invention have the following beneficial effects:

[0019] The two valve plates are matched with the two concave push rings by the extrusion mechanism, the sealing property of the valve plate is improved, the water outlet is avoided after the valve is sealed, the gear driving mechanism is driven by the valve rod to move when the valve is closed, the extrusion mechanism is driven by the gear driving mechanism to match the valve plate and the concave push ring, the valve plate and the concave push ring are matched synchronously when the valve is closed, use is facilitated, the inflation sealing mechanism is driven by the valve rod to move when the valve is closed, and the sealing property of the valve is further improved.

[0020] Of course, implementing any product of the application does not necessarily require all the advantages described above. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed for the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0022] Figure 1 It is a front view of the present application;

[0023] Figure 2 It is a sectional view of the present application;

[0024] Figure 3 It is a partial enlarged view of A in the present application Figure 2

[0025] Figure 4 It is a partial enlarged view of B in the present application Figure 2

[0026] Figure 5 It is a partial enlarged view of C in the present application Figure 2

[0027] Figure 6 It is a partial schematic view of the present application after the tension spring is reset;

[0028] Figure 7 It is a first partial perspective view of the present application;

[0029] Figure 8 It is a first partial sectional view of the present application;

[0030] Figure 9 It is a partial enlarged view of D in the present application Figure 8

[0031] Figure 10 It is a second partial perspective view of the present application;

[0032] ​​​​Figure 11 Figure 2 is a second partial sectional view of the present application.

[0033] In the figure: 1, valve body; 2, upper cover; 3, valve frame; 4, hand wheel; 5, valve rod; 6, diamond-shaped extrusion block; 7, valve plate; 8, concave push ring; 9, fixed valve seat; 10, rubber inflation ring; 11, connecting plate; 12, first groove; 13, tooth ring; 14, driving gear; 15, driven gear; 16, drive screw; 17, second groove; 18, first spring; 19, first sliding plate; 20, first connecting rod; 21, third groove; 22, extrusion plate; 23, fourth groove; 24, trapezoidal extrusion block; 25, accommodating groove; 26, tension spring; 27, fifth groove; 28, air chamber; 29, second sliding plate; 30, piston; 31, second connecting rod; 32, communication groove; 33, arc-shaped extrusion plate; 34, second spring; 35, communication pipe. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0035] In the description of the present application, it should be understood that the terms "opening", "upper", "middle", "length", "inner" and the like indicate the orientation or positional relationship, and are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the referred components or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In order to keep the following description of the embodiments of the present application clear and concise, the present application omits the detailed description of known functions and known components.

[0037] Embodiment one

[0038] Please refer to Figures 1-11As shown, in the embodiment, a gate valve and a control method thereof are provided. The gate valve comprises a valve body 1, a top end of the valve body 1 is fixedly connected with an upper cover 2, and a top end of the upper cover 2 is fixedly connected with a valve frame 3; a valve rod 5 is rotatably connected in the valve frame 3, and the valve rod 5 is downwardly movable and penetrates into the valve body 1; two valve plates 7 are respectively arranged on two sides of the valve rod 5 to seal the valve body 1; two fixed valve seats 9 are fixedly connected on two sides in the valve body 1, and the two fixed valve seats 9 are respectively provided with a concave push ring 8 at an end close to each other; two sets of elastic assemblies are respectively arranged between the two fixed valve seats 9 and the two concave push rings 8 to drive the two concave push rings 8 to be attached to the two valve plates 7; two sets of inflation sealing mechanisms are respectively arranged between the two fixed valve seats 9 and the two concave push rings 8 to seal between the two concave push rings 8 and the two valve plates 7; a pressing mechanism is arranged between the valve rod 5 and the two valve plates 7 to drive the valve plate 7 to be attached to the two concave push rings 8; a gear driving mechanism is arranged in the valve rod 5 to drive the pressing mechanism to move; the two valve plates 7 are pressed to be attached to the two concave push rings 8 by the pressing mechanism, and the sealing property of the valve plate 7 is improved, so that the water leakage is avoided after the valve is sealed; the gear driving mechanism is driven to move by the valve rod 5 screwed when the valve is closed, and the pressing mechanism is driven by the gear driving mechanism to be attached to the valve plate 7 and the concave push ring 8, so that the valve plate 7 and the concave push ring 8 are simultaneously attached when the valve is closed, and the use is facilitated; and the inflation sealing mechanism is driven to move by the valve rod 5 screwed when the valve is closed, and the sealing property of the valve is further improved.

[0039] In one aspect of the embodiment, as shown, Figure 3 Each set of elastic assemblies comprises a plurality of second grooves 17 arranged in the fixed valve seat 9, a first sliding plate 19 is slidably connected in each of the plurality of second grooves 17, a first connecting rod 20 is fixedly connected to a side end of each of the plurality of first sliding plates 19, the concave push ring 8 is fixedly connected to a side end of the plurality of first connecting rods 20, a first spring 18 is fixedly connected to a side end of each of the plurality of first sliding plates 19, and each of the plurality of first springs 18 is fixedly connected in each of the plurality of second grooves 17.

[0040] In one aspect of the embodiment, as shown, Figure 5 and Figure 11As shown, the inflation sealing mechanism comprises a rubber inflation ring 10 arranged at the side end of the concave push ring 8, a communication pipe 35 fixedly connected in the concave push ring 8 and communicated with the rubber inflation ring 10, a communication groove 32 arranged in the valve body 1 and the fixed valve seat 9, the communication pipe 35 fixedly connected at the side end of the fixed valve seat 9 and communicated with the communication groove 32, an air chamber 28 arranged in the valve body 1 and communicated with the communication groove 32, a second sliding plate 29 slidably connected in the air chamber 28, a piston 30 fixedly connected at the side end of the second sliding plate 29, a second connecting rod 31 fixedly connected at the other end of the second sliding plate 29, a fifth groove 27 arranged in the valve body 1, the second connecting rod 31 outwardly and movably penetrating into the fifth groove 27, an arc-shaped extrusion plate 33 fixedly connected at the side end of the second connecting rod 31, the valve rod 5 downwardly and movably penetrating into the fifth groove 27, a rhombic extrusion block 6 fixedly connected on the surface of the valve rod 5, the surface of the rhombic extrusion block 6 in contact with the surface of the arc-shaped extrusion plate 33, a second spring 34 fixedly connected at the side end of the arc-shaped extrusion plate 33, the side end of the second spring 34 fixedly connected in the fifth groove 27, and the second spring 34 sleeved on the circumferential surface of the second connecting rod 31; when closing the valve, the valve rod 5 is rotated by rotating the hand wheel 4, the valve rod 5 rotates at the same time to drive the rhombic extrusion block 6 to rotate, the rhombic extrusion block 6 rotates to extrude the arc-shaped extrusion plate 33 through the longer two ends, the two arc-shaped extrusion plates 33 move in the direction away from each other, the arc-shaped extrusion plate 33 is extruded to drive the second connecting rod 31 to move inwardly, the second connecting rod 31 drives the second sliding plate 29 and the piston 30 to extrude the air in the air chamber 28, the air in the air chamber 28 enters the rubber inflation ring 10 through the communication groove 32 and the communication pipe 35 to inflate the rubber inflation ring 10, the rubber inflation ring 10 is inflated to fill the gap between the concave push ring 8 and the valve plate 7, and the sealing property of the valve is increased.

[0041] In another aspect of the embodiment, as Figure 4 and Figure 5As shown, the extrusion mechanism comprises a connecting plate 11 fixedly connected to the circumferential surface of the valve rod 5, a fourth groove 23 is formed in the connecting plate 11, two trapezoidal extrusion blocks 24 are slidably connected in the fourth groove 23, the two trapezoidal extrusion blocks 24 are fixedly connected to the two valve plates 7 respectively, a third groove 21 is formed in the connecting plate 11 and communicates with the fourth groove 23, an extrusion plate 22 is slidably connected in the third groove 21, a drive screw 16 is rotatably connected in the third groove 21, the extrusion plate 22 is threadedly connected to the circumferential surface of the drive screw 16, the inclined surfaces of the two trapezoidal extrusion blocks 24 are in contact with the extrusion plate 22, the two trapezoidal extrusion blocks 24 are provided with accommodating grooves 25 at the ends close to each other, and the same tension spring 26 is fixedly connected in the two accommodating grooves 25; the drive screw 16 is a reciprocating screw; the drive screw 16 is rotated to drive the extrusion plate 22 to move downward, the extrusion plate 22 moves downward into the fourth groove 23, the extrusion plate 22 extrudes the inclined surfaces of the two trapezoidal extrusion blocks 24, the two trapezoidal extrusion blocks 24 move away from each other, the trapezoidal extrusion blocks 24 move away from each other to stretch the tension spring 26, and the two trapezoidal extrusion blocks 24 drive the two valve plates 7 to move outward to abut against the two concave push rings 8 respectively, and the elastic push ring 8 and the valve plate 7 are tightly abutted by the cooperation of the first spring 18, so that the sealing performance of the pipeline is improved.

[0042] Embodiment two

[0043] On the basis of embodiment one, reference is made to the accompanying drawings Figure 9 and Figure 10 The gear drive mechanism comprises a first groove 12 formed in the valve rod 5, the drive screw 16 is upwardly movable and penetrates into the first groove 12, the circumferential surface of the drive screw 16 is fixedly connected with a driven gear 15, the first groove 12 is rotatably connected with a driving gear 14 engaged with the driven gear 15, and the top end of the valve frame 3 is fixedly connected with a tooth ring 13 engaged with the driving gear 14; when it is needed to close the valve, the valve rod 5 is rotated by rotating the hand wheel 4, the valve rod 5 drives the connecting plate 11 to rotate, the connecting plate 11 drives the two valve plates 7 to rotate and close, the valve rod 5 drives the driving gear 14 to move in a circumferential direction, the driving gear 14 is engaged with the tooth ring 13 when moving in the circumferential direction, the tooth ring 13 drives the driving gear 14 to rotate, and the driving gear 14 drives the driven gear 15 and the drive screw 16 to rotate.

[0044] A gate valve control method of a gate valve, comprising the following steps:

[0045] S1, when the valve needs to be closed, the hand wheel 4 drives the valve rod 5 to rotate, the valve rod 5 drives the connecting plate 11 to rotate, the connecting plate 11 drives the two valve plates 7 to rotate to close, the valve rod 5 drives the driving gear 14 to move in a circle, the driving gear 14 moves in a circle and meshes with the gear ring 13, the gear ring 13 drives the driving gear 14 to rotate, the driving gear 14 drives the driven gear 15 and the driving screw 16 to rotate, the driving screw 16 drives the extrusion plate 22 to move downwards into the fourth groove 23, the extrusion plate 22 extrudes the inclined surface of the two trapezoidal extrusion blocks 24, the two trapezoidal extrusion blocks 24 move away from each other, the trapezoidal extrusion blocks 24 move away from each other to stretch the tension spring 26, the two trapezoidal extrusion blocks 24 drive the two valve plates 7 to move outwards to press the two concave push rings 8 respectively, the first spring 18 is elastically pushed to make the concave push ring 8 and the valve plate 7 tightly adhere to each other to improve the sealing performance of the pipeline.

[0046] S2, when the valve is opened, the hand wheel 4 is rotated by 90 degrees, the hand wheel 4 drives the valve rod 5 to rotate, the valve rod 5 drives the connecting plate 11 to rotate, the connecting plate 11 drives the two valve plates 7 to rotate to close, the valve rod 5 drives the driving gear 14 to move in a circle, the driving gear 14 moves in a circle and meshes with the gear ring 13, the gear ring 13 drives the driving gear 14 to rotate, the driving gear 14 drives the driven gear 15 and the driving screw 16 to rotate, the driving screw 16 drives the extrusion plate 22 to move downwards into the third groove 21 again.

[0047] S3, when the valve is closed, the hand wheel 4 drives the valve rod 5 to rotate, the valve rod 5 drives the diamond-shaped extrusion block 6 to rotate, the diamond-shaped extrusion block 6 is extruded by the longer ends of the two arc-shaped extrusion plates 33, the two arc-shaped extrusion plates 33 move away from each other, the arc-shaped extrusion plates 33 are extruded to drive the second connecting rod 31 to move inwards, the second connecting rod 31 drives the second sliding plate 29 and the piston 30 to extrude the air in the air chamber 28, the air in the air chamber 28 enters the rubber inflatable ring 10 through the communication groove 32 and the communication pipe 35 to inflate the rubber inflatable ring 10, the rubber inflatable ring 10 is inflated to fill the gap between the concave push ring 8 and the valve plate 7, and the sealing performance of the valve is improved.

[0048] S4, when the valve is opened, the two diamond-shaped extrusion blocks 6 are extruded by the longer ends of the two arc-shaped extrusion plates 33, the arc-shaped extrusion plates 33 are elastically pushed to reset by the second spring 34, the arc-shaped extrusion plates 33 drive the second sliding plate 29 and the piston 30 to move in the air chamber 28 through the second connecting rod 31, and the piston 30 extracts the air in the rubber inflatable ring 10 through the communication groove 32 and the communication pipe 35.

[0049] It should be noted that the terms "first", "second", and the like, as used in the description of the specification, are used only to distinguish between similar objects and do not necessarily indicate a serial or chronological order, unless otherwise specified. The application is not limited to the specific embodiments described in the specification.

[0050] In the description of the specification, the description of the terms "one embodiment", "an example", "a specific example", and the like, means that the specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0051] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all the details and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A gate valve, characterized by Include: Valve body (1), the surface of valve body (1) is fixedly connected with upper cover (2), the top of upper cover (2) is fixedly connected with valve frame (3); Valve stem (5), valve stem (5) is rotatably connected in valve frame (3), valve stem (5) is downwardly movable and penetrates into valve body (1); Two valve plates (7), two valve plates (7) are respectively arranged on the two sides of valve stem (5) to seal valve body (1); Two fixed valve seats (9), two fixed valve seats (9) are fixedly connected on the two sides in valve body (1), the end of two fixed valve seats (9) close to each other is provided with concave push ring (8); Two sets of elastic components, two sets of elastic components are respectively arranged between two fixed valve seats (9) and two concave push rings (8) to drive two concave push rings (8) to adhere to two valve plates (7); Two sets of inflation sealing mechanisms, two sets of inflation sealing mechanisms are respectively arranged between two fixed valve seats (9) and two concave push rings (8) to seal between two concave push rings (8) and two valve plates (7); Extrusion mechanism, extrusion mechanism is arranged between valve stem (5) and two valve plates (7) to drive valve plate (7) to adhere to two concave push rings (8) outwardly; Gear drive mechanism, gear drive mechanism is arranged in valve stem (5) to drive extrusion mechanism to move; The extrusion mechanism includes a connecting plate (11) fixedly connected to the circumferential surface of the valve stem (5), a fourth recess (23) is formed in the connecting plate (11), two trapezoidal extrusion blocks (24) are slidably connected in the fourth recess (23), the two trapezoidal extrusion blocks (24) are fixedly connected to the ends of the two valve plates (7) close to each other, a third recess (21) is formed in the connecting plate (11) and communicates with the fourth recess (23), an extrusion plate (22) is slidably connected in the third recess (21), a drive screw (16) is rotatably connected in the third recess (21), the extrusion plate (22) is threadedly connected to the circumferential surface of the drive screw (16), the inclined surfaces of the two trapezoidal extrusion blocks (24) are in contact with the extrusion plate (22), accommodating grooves (25) are formed in the ends of the two trapezoidal extrusion blocks (24) close to each other, and a same tension spring (26) is fixedly connected in the two accommodating grooves (25); The gear drive mechanism includes a first recess (12) formed in the valve stem (5), the drive screw (16) is upwardly movable and penetrates into the first recess (12), a driven gear (15) is fixedly connected to the circumferential surface of the drive screw (16), a driving gear (14) is rotatably connected in the first recess (12) and engages with the driven gear (15), and a gear ring (13) is fixedly connected to the top of the valve frame (3) and engages with the driving gear (14).

2. A gate valve as claimed in claim 1, characterised in that Each of the elastic assemblies comprises a plurality of second grooves (17) formed in the fixed valve seat (9), a first sliding plate (19) is slidably connected in each of the second grooves (17), a first connecting rod (20) is fixedly connected to the side end of each of the first sliding plates (19), the concave push ring (8) is fixedly connected to the side end of the first connecting rods (20), a first spring (18) is fixedly connected to the side end of each of the first sliding plates (19), and each of the first springs (18) is fixedly connected in the second groove (17).

3. A gate valve as claimed in claim 2, wherein The inflation sealing mechanism comprises a rubber inflation ring (10) arranged at the side end of the concave push ring (8), the concave push ring (8) is fixedly connected with a communication pipe (35) in communication with the rubber inflation ring (10), the valve body (1) and the fixed valve seat (9) are provided with a communication groove (32), the side end of the fixed valve seat (9) is fixedly connected with the communication pipe (35) in communication with the communication groove (32), the valve body (1) is provided with an air chamber (28) in communication with the communication groove (32), a second sliding plate (29) is slidably connected in the air chamber (28), a piston (30) is fixedly connected to the side end of the second sliding plate (29), a second connecting rod (31) is fixedly connected to the other end of the second sliding plate (29), the valve body (1) is provided with a fifth groove (27), the second connecting rod (31) is outwardly movable and penetrates into the fifth groove (27), an arc-shaped extrusion plate (33) is fixedly connected to the side end of the second connecting rod (31), the valve rod (5) downwardly penetrates into the fifth groove (27), a rhombic extrusion block (6) is fixedly connected to the surface of the valve rod (5), the surface of the rhombic extrusion block (6) is in contact with the surface of the arc-shaped extrusion plate (33), a second spring (34) is fixedly connected to the side end of the arc-shaped extrusion plate (33), the side end of the second spring (34) is fixedly connected in the fifth groove (27), and the second spring (34) is sleeved on the circumferential surface of the second connecting rod (31).

4. A gate valve as claimed in claim 1, wherein The driving screw rod (16) is a reciprocating screw rod.

5. A gate valve as claimed in claim 1, wherein The top end of the circumferential surface of the valve rod (5) is fixedly connected with a hand wheel (4).

6. A gate valve control method of a gate valve according to claim 3, characterized by, The method comprises the following steps: The method comprises the following steps: S1, when the valve needs to be closed, rotate the hand wheel (4) to drive the valve rod (5) to rotate, the valve rod (5) drives the connecting plate (11) to rotate, the connecting plate (11) drives the two valve plates (7) to rotate to close, the valve rod (5) drives the driving gear (14) to move in a circle, the driving gear (14) moves in a circle and engages with the gear ring (13), the gear ring (13) drives the driving gear (14) to rotate, the driving gear (14) drives the driven gear (15) and the driving screw (16) to rotate, the driving screw (16) drives the extrusion plate (22) to move downward into the fourth groove (23), the extrusion plate (22) extrudes the inclined surface of the two trapezoidal extrusion blocks (24), the two trapezoidal extrusion blocks (24) move away from each other, the trapezoidal extrusion blocks (24) move away from each other to stretch the tension spring (26), the two trapezoidal extrusion blocks (24) drive the two valve plates (7) to move outward and press the two concave push rings (8) respectively, the first spring (18) is elastically pushed to make the concave push ring (8) and the valve plate (7) tightly adhere to each other to improve the sealing performance of the pipeline; S2, when the valve is opened, rotate the hand wheel (4) by 90°, rotate the hand wheel (4) to drive the valve rod (5) to rotate, the valve rod (5) drives the connecting plate (11) to rotate, the connecting plate (11) drives the two valve plates (7) to rotate to close, the valve rod (5) drives the driving gear (14) to move in a circle, the driving gear (14) moves in a circle and engages with the gear ring (13), the gear ring (13) drives the driving gear (14) to rotate, the driving gear (14) drives the driven gear (15) and the driving screw (16) to rotate, the driving screw (16) drives the extrusion plate (22) to move downward into the third groove (21) again; S3, when the valve is closed, rotate the hand wheel (4) to drive the valve rod (5) to rotate, the valve rod (5) drives the diamond-shaped extrusion block (6) to rotate, the diamond-shaped extrusion block (6) is extruded by the two longer ends of the arc-shaped extrusion plate (33), the two arc-shaped extrusion plates (33) move away from each other, the arc-shaped extrusion plate (33) is extruded to drive the second connecting rod (31) to move inward, the second connecting rod (31) drives the second sliding plate (29) and the piston (30) to extrude the air in the air chamber (28), the air in the air chamber (28) enters the rubber inflatable ring (10) through the communication groove (32) and the communication pipe (35) to inflate the rubber inflatable ring (10), the rubber inflatable ring (10) is inflated to fill the gap between the concave push ring (8) and the valve plate (7), and the sealing performance of the valve is improved. S4, when the valve is opened, the two diamond-shaped extrusion blocks (6) lose the extrusion of the longer ends, the arc-shaped extrusion plate (33) is pushed back by the elasticity of the second spring (34), the arc-shaped extrusion plate (33) drives the second sliding plate (29) and the piston (30) to move in the air chamber (28) through the second connecting rod (31), and the piston (30) extracts the air in the rubber inflatable ring (10) through the communication groove (32) and the communication pipe (35).

Images