Gate valve with buffer structure

Abstract

The gate valve comprises an opening and closing control structure, a matching body, a support, an upper sealing seat, a mounting seat, a valve body and a nut, the matching body is arranged to serve as a power source for tilting and swinging of a buffer part, a force application structure is arranged to provide up-down displacement power for a force guiding structure, and the force guiding structure is arranged to provide up-down displacement power for the buffer part. When the buffer plate is transversely placed, the device is in an open state, the buffer plate does not cause flow resistance to fluid, when the device needs to be closed, the vertical frame is driven by the fluctuating arm to move downwards, the downward pulling force is applied to the buffer plate, and the buffer plate is prevented from moving upwards and downwards when the device needs to be closed. The buffer plate inclines to gradually block the fluid, the flow speed of the fluid is reduced, and the flow is reduced, so that the flow passing through the buffer piece and flowing to the valve plate is small, the fluid bearing capacity of the valve plate is small, and damage to the valve plate is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the field of machinery, and in particular to a gate valve with a buffer structure. Background Art

[0002] The gate valve is a commonly used shut-off valve that mainly controls the flow of fluid by raising and lowering the gate. The movement direction of the gate is perpendicular to the direction of the fluid. It is widely used in the petroleum, chemical, electric power, metallurgy, water supply and drainage and other industries.

[0003] When optimizing existing gate valves, most of the focus is on avoiding the problem of valve plate and valve stem being separated. For example, the Chinese invention patent with application number CN201810572912.4 discloses a "gate valve", which includes: a valve body, a valve plate, a valve stem and a locking device; a valve cavity is provided inside the valve body, and the valve cavity has an inlet and an outlet formed at both ends of the valve body respectively; a telescopic hole is provided on the side wall of the valve body, and the valve plate extends into the valve cavity through the telescopic hole; a slot is provided on the inner wall of the valve cavity, and the valve plate is inserted into the slot; a guide rail is provided at the bottom of the slot, and a guide groove cooperating with the guide rail is provided on the valve plate; a slide groove is provided on the valve plate, and a slider is provided on the valve stem, and the slider is slid into the slide groove; a locking device is provided on the valve plate to prevent the slider from moving outside the slide groove; when the guide rail is corroded by crude oil and falls off, the valve plate shakes in the slot, and the locking device can prevent the slider from moving outside the slide groove, thereby preventing the slider from separating from the slide groove, thereby preventing the valve plate from being separated from the valve stem.

[0004] Although the above-mentioned gate valve has certain advantages in avoiding the problem of separation between the valve plate and the valve stem, it still has certain disadvantages: when the gate valve is opened and closed, due to the high flow rate of the fluid in the pipe, the fluid will impact the gate plate. If the instantaneous impact force is too large, it will directly cause damage to the gate plate; during the opening and closing process, the gate valve is in a half-open and half-closed process. Since the contact area between the gate plate and the fluid becomes smaller, the bearing force of the lower half of the gate plate will increase, which can also easily cause damage to the gate plate. Summary of the Invention

[0005] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a gate valve with a buffer structure.

[0006] The present invention is achieved by constructing a gate valve with a buffer structure, which includes an opening and closing control structure, a fitting body, a bracket, an upper sealing seat, a mounting seat, a valve body and a nut. The upper part of the fitting body engages with the opening and closing control structure, the bracket is installed above the upper sealing seat, and the upper sealing seat is connected to the upper part of the mounting seat by nuts and bolts. The valve body and the mounting seat are an integrated structure and are welded below them.

[0007] Preferably, the opening and closing control structure includes a handwheel, a screw, a valve plate, a blocking plate, a buffer and a seal. The top end of the screw is transmission-connected to the middle of the handwheel, the lower end of the screw is embedded and connected to the upper end of the valve plate, the blocking plate is welded to the side end of the valve plate and two blocking plates are provided and respectively arranged on both side ends of the valve plate, one side end of the buffer abuts against the side edge of the blocking plate, the seal penetrates the screw, and the screw engages with the upper end of the mating body.

[0008] Preferably, the matching body includes a first protective box, a second protective box, a linkage structure, a connecting plate, a force-applying structure and a force-guiding structure. The upper end of the linkage structure moves inside the first protective box, and the lower end of the linkage structure moves inside the second protective box. The upper and lower ends of the connecting plate are respectively installed with the peripheral bolts of the first protective box and the second protective box. The force-applying structure is arranged on the side of the second protective box, and the force-applying structure is connected to the lower end of the force-guiding structure and movably cooperates with it.

[0009] Preferably, the linkage structure includes a turbine, a bearing, a first gear, a second gear and a connecting shaft, the bearing passes through the middle of the turbine and the inner wall of the turbine and the outer periphery of the bearing are fixedly connected, the bearing passes through the middle of the first gear and the inner wall of the first gear and the outer periphery of the bearing are fixedly connected, the second gear is meshed with the first gear, and one end of the connecting shaft is transmission-connected to the center of the second gear.

[0010] Preferably, the force-applying structure includes an undulating arm, a connecting shaft, a through shaft, an engaging wheel, an anti-deviating wheel, a rotating shaft seat, a fixed seat and an anti-movement structure. The connecting shaft is slidably connected to the upper end face of the undulating arm, the undulating arm is fixedly connected to the outer periphery of the through shaft, the through shaft passes through the middle of the engaging wheel and the inner side wall of the engaging wheel is fixedly connected to the outer periphery of the through shaft, the anti-deviating wheel is engaged and fitted obliquely above the engaging wheel, the rotating shaft seat is fixedly installed on the inner side of the fixed seat, the anti-deviating wheel moves outside the fixed seat through the rotating shaft seat, and the anti-movement structure is plugged into the rear end of the anti-deviating wheel.

[0011] Preferably, the anti-movement structure includes a limit block, a lateral block, a pinch rod, a limit track, a latch seat and a spring. The upper end of the latch seat is welded to the lower end of the limit block, the lateral block is buckled on the side end of the latch seat, the lower end of the pinch rod is welded to the end face of the lateral block and is vertically arranged, the lateral block is elastically connected to the latch seat through a spring, and the limit track and the latch seat are an integrated structure and are arranged through the side end face thereof.

[0012] Preferably, the force-guiding structure includes a vertical frame, balls, a perforated filling pad and a filler, the balls are embedded in the upper end of the vertical frame and rotatably engaged, the filler is placed inside the perforated filling pad, the perforated filling pad penetrates the vertical frame and is fixedly connected to the upper position of the vertical frame.

[0013] Preferably, the buffer component includes a side support frame, a buffer plate and a slide groove, the side end of the buffer plate is hinged to the side support frame, and the slide groove and the buffer plate are an integrated structure and are located at the lower end surface of the buffer plate.

[0014] Preferably, the upper end of the linkage structure is engaged with the screw, and the interiors of the first protective box and the second protective box are both equipped with bearing seats and are respectively connected to the upper and lower ends of the linkage structure. The upper end of the force-guiding structure is slidably connected to the bottom of the buffer, and the seal can be displaced up and down, exerting a push-pull force on the buffer, causing the buffer to perform a fulcrum-type swinging movement, assisting the valve plate, and buffering the fluid.

[0015] Preferably, the turbine is engaged with the screw, and one side end of the connecting shaft is connected to the force-applying structure. The morphological structure of the turbine makes its engagement with the screw have a steering limit, which is convenient for controlling the rotation of the connecting shaft, and then controlling the distance limit of the upward and downward displacement of the force-applying structure on the force-guiding structure.

[0016] Preferably, the upper end surface of the undulating arm is hinged and slidably fitted with the vertical frame through a connecting shaft. After the connecting shaft is embedded in the lower end of the vertical frame, personnel then bolt it with screws, so that the undulating arm can exert a pushing or pulling force on the vertical frame during the undulating movement driven by the through shaft.

[0017] Preferably, the upper and lower ends of the side support frame are respectively welded to the side inner wall of the valve body, and the buffer plate moves on the inner side of the valve body. The buffer plate is a solid plate structure and can perform tilting and swinging movements with the point where it is hinged to the side support frame as a fulcrum.

[0018] Preferably, the vertical frame is movably coordinated with the buffer plate through a sliding connection between a ball and a slide groove, and the buffer plate is tilted and swung by being pushed up or pulled down by the vertical frame. The filler and the perforated filler pad have excellent sealing properties.

[0019] The present invention has the following advantages: The present invention provides a gate valve with a buffer structure through improvement, which has the following improvements compared with similar devices: The gate valve with a buffer structure described in the present invention is equipped with an opening and closing control structure. Personnel can control the up and down displacement of the valve plate by turning a hand wheel, causing the buffer to swing, thereby facilitating the first blocking of the fluid and buffering the impact force of the fluid on the valve plate.

[0020] The gate valve with a buffer structure described in the present invention is provided with a matching body, which serves as the power source for the tilting and swinging of the buffer part. When the screw lifts and moves, the turbine drives the bearing and the second gear to rotate, so that the connecting shaft drives the force-applying structure to move, so that the force-applying structure continues to provide power to the buffer part.

[0021] The gate valve with a buffer structure described in the present invention is equipped with a force-applying structure. When the through shaft is driven by the connecting shaft and rotates, the meshing wheel rotates synchronously with the through shaft, causing the heaving arm to swing in a fulcrum-like manner, and the front end of the heaving arm is connected to the lower end of the force-guiding structure through a connecting shaft, so as to provide up and down displacement power for the force-guiding structure.

[0022] The gate valve with a buffer structure described in the present invention is provided with a force-guiding structure, and the vertical frame is connected to the slide groove by ball sliding, which is beneficial for the vertical frame to apply a pushing force or a downward pulling force to the buffer plate during the up and down movement, so as to facilitate the buffer plate to perform a tilting movement. When the buffer plate is in a horizontal position, the device is in an open state, and the buffer plate will not cause flow resistance to the fluid. When the device is to be closed, the vertical frame moves downward under the drive of the lifting arm, exerts a downward pulling force on the buffer plate, and the buffer plate tilts, gradually blocking the fluid, slowing down the flow rate of the fluid and reducing the flow rate, so that the flow rate that passes the buffer component and flows to the valve plate is small, and the fluid bearing capacity of the valve plate is small, which greatly reduces the damage to the valve plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the present invention; Figure 2 It is a structural schematic diagram of the opening and closing control structure of the present invention; Figure 3 Schematic diagram of the structure of the ligand of the present invention; Figure 4 It is a schematic diagram of the three-dimensional structure of the linkage structure of the present invention; Figure 5 It is a structural schematic diagram of the force-applying structure of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the undulating arm of the present invention; Figure 7 It is a structural schematic diagram of the anti-motion structure of the present invention; Figure 8 It is a structural schematic diagram of the force-guiding structure of the present invention; Figure 9 It is a structural schematic diagram of the buffer member of the present invention; Figure 10 It is a schematic diagram of the three-dimensional structure of the buffer plate of the present invention.

[0024] Wherein: 1. Opening and closing control structure; 2. Matching body; 3. Bracket; 4. Upper sealing seat; 5. Mounting seat; 6. Valve body; 7. Nut; 11. Handwheel; 12. Screw; 13. Valve plate; 14. Blocking plate; 15. Buffer; 16. Sealing member; 21. First protective box; 22. Second protective box; 23. Linkage structure; 24. Connecting plate; 25. Force-applying structure; 26. Force-guiding structure; 231. Turbine; 232. Bearing; 233. First gear; 234. Second gear 235. Connecting shaft; a1. Lifting arm; a2. Connecting shaft; a3. Through shaft; a4. Engaging wheel; a5. Anti-drift wheel; a6. Rotating shaft seat; a7. Fixed seat; a8. Anti-movement structure; a81. Limit block; a82. Lateral block; a83. Pinch rod; a84. Limit track; a85. Latch seat; a86. Spring; w1. Vertical frame; w2. Ball bearing; w3. Filling pad with holes; w4. Filling; 151. Lateral support frame; 152. Buffer plate; 153. Slide groove. DETAILED DESCRIPTION

[0025] The following will be combined with the Figure 1-10 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0026] See also Figure 1-2 The present invention relates to a gate valve with a buffer structure. The device includes an opening and closing control structure 1, a matching body 2, a bracket 3, an upper sealing seat 4, a mounting seat 5, a valve body 6 and a nut 7. The top of the matching body 2 is engaged with the opening and closing control structure 1, the bracket 3 is installed above the upper sealing seat 4, and the upper sealing seat 4 is bolted to the top of the mounting seat 5 by nuts 7. The valve body 6 and the mounting seat 5 are an integrated structure and welded below them. The opening and closing control structure 1 includes a handwheel 11, a screw 12, a valve plate 13, a blocking plate 14, a buffer 15 and a seal 16. The top of the screw 12 is transmission-connected to the middle of the handwheel 11, the lower end of the screw 12 is embedded and connected to the upper end of the valve plate 13, the blocking plate 14 is welded to the side end of the valve plate 13 and the blocking plate 14 is provided with two and is respectively arranged on both side ends of the valve plate 13. One side end of the buffer 15 abuts against the side edge of the blocking plate 14, the seal 16 penetrates the screw 12, and the screw 12 is engaged with the upper end of the matching body 2.

[0027] See also Figure 3-4, a gate valve with a buffer structure of the present invention, the matching body 2 includes a first protective box 21, a second protective box 22, a linkage structure 23, a connecting plate 24, a force-applying structure 25 and a force-guiding structure 26, the upper end of the linkage structure 23 moves inside the first protective box 21, and the lower end of the linkage structure 23 moves inside the second protective box 22, the upper and lower ends of the connecting plate 24 are respectively bolted to the outer periphery of the first protective box 21 and the second protective box 22, the force-applying structure 25 is arranged on the side of the second protective box 22, the force-applying structure 25 is connected to the lower end of the force-guiding structure 26 and movably cooperates, the linkage structure 23 includes a turbine 231, a bearing 232, a first gear 233, a second gear 234 and a connecting shaft 235, the bearing 232 passes through the middle of the turbine 231 and the inner side wall of the turbine 231 is fixedly connected to the outer periphery of the bearing 232, the bearing 232 passes through the middle of the first gear 233 and the inner side wall of the first gear 233 and the bearing 232 The outer periphery of the gear 234 is fixedly connected, the second gear 234 is meshed with the first gear 233, and one end of the connecting shaft 235 is transmission connected to the center of the second gear 234. The upper end of the linkage structure 23 is meshed with the screw 12. The first and second protective boxes 21 and 22 are both equipped with bearing seats and are respectively connected to the upper and lower ends of the linkage structure 23. The upper end of the force-guiding structure 26 is slidably connected to the bottom of the buffer 15, and the seal 16 can be displaced up and down, applying a push-pull force to the buffer 15, so that the buffer 15 performs a fulcrum-type tilting activity, assisting the valve plate 13, and buffering the fluid. The turbine 231 is meshed with the screw 12, and one side end of the connecting shaft 235 is connected to the force-applying structure 25. The morphological structure of the turbine 231 makes its meshing with the screw 12 have a steering limit, which is convenient for controlling the rotation of the connecting shaft 235, and then controlling the force-applying structure 25 to limit the distance of the force-guiding structure 26 to generate up and down displacement.

[0028] See also Figure 5-7, a gate valve with a buffer structure of the present invention, a force-applying structure 25 includes an ups and downs arm a1, a connecting shaft a2, a through shaft a3, a meshing wheel a4, an anti-deviating wheel a5, a rotating shaft seat a6, a fixed seat a7 and an anti-movement structure a8, the connecting shaft a2 is slidably connected to the upper end surface of the ups and downs arm a1, the ups and downs arm a1 is fixedly connected to the outer periphery of the through shaft a3, the through shaft a3 passes through the middle of the meshing wheel a4 and the inner side wall of the meshing wheel a4 is fixedly connected to the outer periphery of the through shaft a3, the anti-deviating wheel a5 is meshed and fitted at an oblique upper part of the meshing wheel a4, the rotating shaft seat a6 is fixedly installed on the inner side of the fixed seat a7, the anti-deviating wheel a5 is movable outside the fixed seat a7 through the rotating shaft seat a6, the anti-movement structure a8 is plugged into the rear end of the anti-deviating wheel a5, and the anti-movement structure a8 includes a limit block a81, a lateral block a82, a pinch block a83, a pinch block a84, a pinch block a85, a pinch block a86, a pinch block a87, a pinch block a88, a pinch block a89, a pinch block a90, a pinch block a91, a pinch block a92, a pinch block a93, a pinch block a94, a pinch block a95, a pinch block a96, a pinch block a97, a pinch block a98, a pinch block a99, a pinch block a91, a pinch block a91 Rod a83, limit track a84, latch seat a85 and spring a86, the upper end of the latch seat a85 is welded to the lower end of the limit block a81, and the lateral block a82 is buckled on the side end of the latch seat a85. The lower end of the pinch rod a83 is welded to the end face of the lateral block a82 and is vertically arranged. The lateral block a82 is elastically connected to the latch seat a85 through the spring a86. The limit track a84 and the latch seat a85 are integrated structures and are arranged at the side end face position. The upper end face of the undulating arm a1 is hinged and slidably matched with the vertical frame w1 through the connecting shaft a2. After the connecting shaft a2 is embedded in the lower end of the vertical frame w1, the personnel then bolt it with screws, so that the undulating arm a1 can exert a pushing or pulling force on the vertical frame w1 during the undulating activity driven by the through-shaft a3.

[0029] See also Figure 8-10 The present invention relates to a gate valve with a buffer structure. The force-guiding structure 26 includes a vertical frame w1, a ball w2, a perforated packing pad w3, and a packing w4. The ball w2 is embedded in the upper end of the vertical frame w1 and rotates to engage. The packing w4 is placed inside the perforated packing pad w3. The perforated packing pad w3 penetrates the vertical frame w1 and is fixedly connected to the upper position of the vertical frame w1. The buffer member 15 includes a side support frame 151, a buffer plate 152, and a slide 153. The side end of the buffer plate 152 is hinged to the side support frame 151, and the slide 153 and the buffer plate 152 are an integrated structure. And it is located at the lower end surface of the buffer plate 152, the upper and lower ends of the side support frame 151 are respectively welded to the side inner wall of the valve body 6, and the buffer plate 152 moves on the inner side of the valve body 6. The buffer plate 152 is a solid plate structure and can be tilted and swung with the point hinged to the side support frame 151 as the fulcrum. The vertical frame w1 is slidably connected with the buffer plate 152 through the ball w2 and the slide groove 153. The tilting and swinging movement of the buffer plate 152 is carried out by being pushed up or pulled down by the vertical frame w1, and the filler w4 and the perforated filler pad w3 have excellent sealing properties.

[0030] The present invention provides a gate valve with a buffer structure through improvement, and its working principle is as follows: The valve body 6 is a structure for fluid to pass through, and the valve cavity inside it can be divided into a feed cavity, a blocking cavity and a discharge cavity. The fluid flows into the feed cavity on the left side of the valve body 6 and flows out of the discharge cavity on the right side of the valve body 6. The opening and closing control structure 1 is used to control whether the fluid inside the valve body 6 is on or off, which is mainly controlled by the lifting and lowering of the valve plate 13. By setting the opening and closing control structure 1, the personnel can turn the hand wheel 11 by hand to make the screw 12 engaged with it to move up and down, drive the valve plate 13 to move up and down, and the blocking plate 14 moves accordingly, and the abutting position with the buffer 15 changes, so that the buffer 15 can be tilted and changed, so as to play a role in blocking the fluid in advance, thereby buffering the impact force of the fluid on the valve plate 13. By setting the matching body 2, which serves as the buffer 15 The power source of the tilting is that the turbine 231 is engaged with the side of the screw 12. Therefore, when the screw 12 is lifted and displaced, the turbine 231 can rotate, driving the bearing 232 to rotate. The rotation force of the bearing 232 serves as the rotational power of the first gear 233, and provides the rotational force for the second gear 234, so that the connecting shaft 235 drives the force-applying structure 25 to move, so that the force-applying structure 25 can continue to provide power to the buffer 15 under the linkage movement. By setting up the force-applying structure 25, when the through shaft a3 is driven by the connecting shaft 235 and rotates, the meshing wheel a4 rotates synchronously with the through shaft a3, causing the undulating arm a1 to swing in a fulcrum-type manner, and the front end of the undulating arm a1 is connected to the lower end of the force-guiding structure 26 through the connecting shaft a2, so as to provide the force-guiding structure The structure 26 provides the power for up and down displacement. By setting up the guide structure 26, the vertical frame w1 is slidably connected to the slide groove 153 through the ball w2. The vertical frame w1 can penetrate the bottom of the valve body 6 for up and down movement without water seepage and leakage through the perforated packing pad w3 and the packing w4. It is beneficial for the vertical frame w1 to pass the pushing force or the downward pulling force on the buffer plate 152 during the up and down movement, so that the buffer plate 152 can be tilted and swung with the point hinged with the side support frame 151 as the fulcrum. The morphological feature of the blocking plate 14 that is wide at the top and narrow at the bottom makes it gradually weakened when the valve plate 13 moves up. The buffer plate 152 is pushed up by the vertical frame w1 and gradually changes from tilting to lateral swinging. When the buffer plate When 152 is in a horizontal position, the lower end of the valve plate 13 is at the upper end inside the valve body 6, and the device is in an open state. The buffer plate 152 is horizontally placed and will not cause flow resistance to the fluid. When the device is to be closed, during this process, the valve plate 13 drives the blocking plate 14 to gradually move downward, and the lateral resistance exerted by the side end of the blocking plate 14 on the buffer plate 152 gradually increases, and the vertical frame w1 moves downward under the drive of the undulating arm a1, exerting a downward pulling force on the buffer plate 152, and the ball w2 continuously slides to the edge position of one side end of the buffer plate 152, causing the buffer plate 152 to tilt, gradually blocking the fluid, slowing down the flow rate of the fluid and reducing the flow rate, so that the flow rate that passes the buffer 15 and flows to the valve plate 13 is small, and the fluid bearing capacity of the valve plate 13 is small.The damage to the valve plate 13 is greatly reduced.

[0031] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0032] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A gate valve with a buffer structure, characterized in that: The valve comprises an opening and closing control structure (1), a matching body (2), a bracket (3), an upper sealing seat (4), a mounting seat (5), a valve body (6) and a nut (7), wherein the upper portion of the matching body (2) is engaged with the opening and closing control structure (1), the bracket (3) is mounted above the upper sealing seat (4), the upper sealing seat (4) is bolted to the upper portion of the mounting seat (5) via a nut (7), and the valve body (6) and the mounting seat (5) are an integrated structure and are welded to the lower portion thereof; The opening and closing control structure (1) includes a handwheel (11), a screw (12), a valve plate (13), a blocking plate (14), a buffer (15) and a sealing member (16). The top end of the screw (12) is transmission-connected to the middle of the handwheel (11), the lower end of the screw (12) is embedded and connected to the upper end of the valve plate (13), the blocking plate (14) is welded to the side end of the valve plate (13) and two blocking plates (14) are provided and respectively arranged on the two side ends of the valve plate (13), one side end of the buffer (15) is in contact with the side edge of the blocking plate (14), the sealing member (16) penetrates the screw (12), and the screw (12) is meshed with the upper end of the mating body (2).

2. The gate valve with a buffer structure according to claim 1, characterized in that: The matching body (2) comprises a first protective box (21), a second protective box (22), a linkage structure (23), a connecting plate (24), a force-applying structure (25) and a force-guiding structure (26); the upper end of the linkage structure (23) moves inside the first protective box (21); the lower end of the linkage structure (23) moves inside the second protective box (22); the upper and lower ends of the connecting plate (24) are respectively bolted to the outer peripheries of the first protective box (21) and the second protective box (22); the force-applying structure (25) is arranged beside the second protective box (22); and the force-applying structure (25) is connected to the lower end of the force-guiding structure (26) and movably matched.

3. The gate valve with a buffer structure according to claim 2, characterized in that: The linkage structure (23) includes a turbine (231), a bearing (232), a first gear (233), a second gear (234) and a connecting shaft (235), wherein the bearing (232) passes through the middle of the turbine (231) and the inner side wall of the turbine (231) and the outer periphery of the bearing (232) are fixedly connected, the bearing (232) passes through the middle of the first gear (233) and the inner side wall of the first gear (233) and the outer periphery of the bearing (232) are fixedly connected, the second gear (234) is meshed with the first gear (233), and one end of the connecting shaft (235) is transmission-connected to the center of the second gear (234).

4. The gate valve with a buffer structure according to claim 2, characterized in that: The force-applying structure (25) comprises an undulating arm (a1), a connecting shaft (a2), a through shaft (a3), an engaging wheel (a4), an anti-deviating wheel (a5), a rotating shaft seat (a6), a fixed seat (a7) and an anti-movement structure (a8), wherein the connecting shaft (a2) is slidably connected to the upper end surface of the undulating arm (a1), the undulating arm (a1) is fixedly connected to the outer periphery of the through shaft (a3), the through shaft (a3) passes through the middle of the engaging wheel (a4) and the inner side wall of the engaging wheel (a4) is fixedly connected to the outer periphery of the through shaft (a3), the anti-deviating wheel (a5) is engaged with the engaging wheel (a4) at an angle above the through shaft seat (a6), the rotating shaft seat (a6) is fixedly mounted on the inner side of the fixed seat (a7), the anti-deviating wheel (a5) moves outside the fixed seat (a7) through the rotating shaft seat (a6), and the anti-movement structure (a8) is plugged into the rear end of the anti-deviating wheel (a5).

5. The gate valve with a buffer structure according to claim 4, characterized in that: The anti-movement structure (a8) includes a limit block (a81), a lateral block (a82), a pinching rod (a83), a limit track (a84), a latch seat (a85) and a spring (a86); the upper end of the latch seat (a85) is welded to the lower end of the limit block (a81); the lateral block (a82) is buckled on the side end of the latch seat (a85); the lower end of the pinching rod (a83) is welded to the end face of the lateral block (a82) and is vertically arranged; the lateral block (a82) is elastically connected to the latch seat (a85) through the spring (a86); the limit track (a84) and the latch seat (a85) are an integrated structure and are arranged at the side end face thereof.

6. The gate valve with a buffer structure according to claim 2, characterized in that: The force-guiding structure (26) comprises a vertical frame (w1), a ball (w2), a perforated filler pad (w3) and a filler (w4); the ball (w2) is embedded in the upper end of the vertical frame (w1) and is rotatably engaged; the filler (w4) is placed inside the perforated filler pad (w3); the perforated filler pad (w3) penetrates the vertical frame (w1) and is fixedly connected to the upper portion of the vertical frame (w1).

7. The gate valve with a buffer structure according to claim 1, characterized in that: The buffer member (15) comprises a side support frame (151), a buffer plate (152) and a slide groove (153); the side end of the buffer plate (152) is hinged to the side support frame (151); the slide groove (153) and the buffer plate (152) are an integrated structure and are located at the lower end surface of the buffer plate (152).

8. The gate valve with a buffer structure according to claim 2, characterized in that: The upper end of the linkage structure (23) is meshed with the screw (12), the first protective box (21) and the second protective box (22) are both equipped with bearing seats and are respectively connected to the upper and lower ends of the linkage structure (23), and the upper end of the force-guiding structure (26) is slidably connected to the bottom of the buffer (15).

9. The gate valve with a buffer structure according to claim 3, characterized in that: The turbine (231) is meshed with the screw (12), and one side end of the connecting shaft (235) is connected to the force-applying structure (25).

10. The gate valve with a buffer structure according to claim 4, characterized in that: The upper end surface of the undulating arm (a1) is hingedly connected to the vertical frame (w1) via a connecting shaft (a2) to slide in cooperation.

11. The gate valve with a buffer structure according to claim 7, characterized in that: The upper and lower ends of the side support frame (151) are respectively welded to the inner side wall of the valve body (6), and the buffer plate (152) moves on the inner side of the valve body (6).

12. The gate valve with a buffer structure according to claim 6, characterized in that: The vertical frame (w1) is movably matched with the buffer plate (152) through the sliding connection between the ball (w2) and the slide groove (153).

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