Gate valve

Abstract

The utility model discloses a gate valve, which relates to the technical field of valves and comprises a valve casing, the valve casing is provided with an inner cavity, the upper wall of the inner cavity is provided with a feed port, and the lower wall of the inner cavity is provided with a discharge port; the flashboard mechanism comprises a flashboard assembly, a flashboard guide rail and a flashboard driving mechanism; the flashboard guide rail is mounted in the inner cavity and is parallel to the upper wall surface of the inner cavity; the lower plate face of the flashboard assembly is slidably connected in the length direction of the flashboard guide rail and attached to the flashboard guide rail in a matched mode. The upper plate face of the flashboard assembly slides and attached to the upper wall face of the inner cavity in a matched mode. The fixed end of the flashboard driving mechanism is installed on the outer wall of the valve shell, and the driving end of the flashboard driving mechanism penetrates through the outer wall of the valve shell, extends into the inner cavity and is in transmission connection with the flashboard assembly to drive the flashboard assembly to horizontally move so as to gradually block or open the feeding port. According to the utility model, the valve body can be hermetically connected with a transmission mechanism, the working environment is prevented from being polluted by material leakage when the valve works, and particulate matters are prevented from hindering the movement of the flashboard, so that the flashboard is effectively prevented from being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a knife gate valve. Background Art

[0002] A knife gate valve is a device used to control the transportation of powder materials, granular materials, and small pieces of materials, and is widely used in the industrial field. Its principle is to drive the gate plate to reciprocate horizontally through a cylinder or a hydraulic cylinder to open and close the gate, thereby realizing the conduction and cutting of material transportation; the connection between the valve body structure and the valve plate driving mechanism of the existing knife gate valve cannot achieve full enclosure, so it is impossible to effectively prevent material leakage, and the leaked materials are likely to cause environmental pollution in the working environment; moreover, when the existing knife gate valve is in use, it often gets stuck due to the presence of particulate matter, resulting in unsmooth and easy jamming of the knife gate switch.

[0003] Chinese Patent (Grant Publication No. CN 220452754 U, Grant Publication Date: February 6, 2024) discloses a knife gate valve device. Although there is a large gap between its upper gate plate and the top plate, and a scraper is provided above the gate plate assembly to drop the accumulated materials, which plays a certain role in avoiding the jamming of the gate plate, the technical solution of guiding the gate plate assembly by using a roller assembly still cannot effectively avoid the adverse situation that the roller body crushes the material particles on the top surface of the upper gate plate, resulting in jamming of the gate plate and unstable operation.

[0004] Therefore, how to provide a knife gate valve that can achieve a sealed connection between the valve body and the transmission mechanism, prevent the working environment from being polluted due to material leakage during valve operation, and avoid particulate matter from hindering the movement of the gate plate to effectively prevent the gate plate from jamming is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In view of this, the utility model proposes a knife gate valve, aiming to solve the technical problem that the existing knife gate valve cannot effectively avoid particulate matter from hindering the movement of the gate plate and is prone to cause jamming of the gate plate.

[0006] To achieve the above object, the utility model adopts the following technical scheme:

[0007] The utility model provides a knife gate valve, including a valve housing, the valve housing has an inner cavity, a feed inlet is provided on the upper wall of the inner cavity, and a discharge outlet is provided on the lower wall of the inner cavity; further including:

[0008] A gate mechanism, the gate mechanism includes a gate assembly, a gate guide and a gate driving mechanism; the gate guide is installed in the inner cavity and arranged parallel to the upper wall of the inner cavity; the lower plate surface of the gate assembly is slidably connected along the length direction of the gate guide and fits on the gate guide, and the upper plate surface of the gate assembly slides and fits on the upper wall of the inner cavity; the fixed end of the gate driving mechanism is sealed and installed on the outer wall of the valve housing, and the driving end of the gate driving mechanism passes through the outer wall of the valve housing and extends into the inner cavity and is transmission-connected to the gate assembly to drive the gate assembly to translate, thereby gradually blocking or opening the feed port.

[0009] The upper plate surface of the gate assembly of the plug valve of the utility model is adapted to be tightly attached to the upper wall surface of its inner cavity, which can prevent particles from entering and causing jamming; the lower plate surface of the gate assembly slides and is tightly attached to the gate guide rail, and can sweep the guide rail surface when moving, which can prevent particles from jamming the guide rail surface; the feed port, inner cavity and discharge port of the plug valve are connected in sequence to construct a vertical material drop channel; the gate drive mechanism controls the translation of the gate assembly to achieve blocking or opening of the feed port, and finally realizes the switching of the plug valve; the plug valve of the utility model can prevent particles from hindering the movement of the plug, and effectively prevent the gate from getting stuck.

[0010] As a further improvement of the above technical solution, the gate assembly includes a left gate and a right gate; the gate drive mechanism includes a left gate drive mechanism and a right gate drive mechanism;

[0011] The left gate plate and the right gate plate are arranged opposite to each other along the length direction of the gate plate guide rail, and their upper plate surfaces slide and fit on the upper wall of the inner cavity, and their lower parts are slidably connected along the length direction of the gate plate guide rail and fit on the upper part of the gate plate guide rail; the left gate plate driving mechanism and the right gate plate driving mechanism are symmetrically arranged on two opposite side walls of the valve housing; the driving end of the left gate plate driving mechanism is transmission connected to the left gate plate, and the driving end of the right gate plate driving mechanism is transmission connected to the right gate plate, so as to drive the left gate plate and the right gate plate to slide along the length direction of the gate plate guide rail and cooperate to open and close the feed port.

[0012] The beneficial effect of the above technical solution is: by setting the left gate and the right gate, the feed port is opened and closed by opening the two gates opposite to each other, which can increase the opening and closing speed of the gate valve and improve the control accuracy of the flow rate.

[0013] As a further improvement of the above technical solution, the side end of the left gate plate close to the right gate plate has a chamfer to form a wedge-shaped body 1; the side end of the right gate plate close to the left gate plate has a chamfer to form a wedge-shaped body 2; the wedge-shaped body 1 and the wedge-shaped body 2 can abut against each other and overlap up and down.

[0014] The beneficial effects of the above technical solution are as follows: When the wedge body 1 of the left gate plate and the wedge body 2 of the right gate plate are adaptively abutted and closed, the closing method of overlapping up and down improves the sealing performance of the gate plate.

[0015] As a further improvement of the above technical solution, a left connecting ear is fixed on the lower plate surface of the left gate plate; a right connecting ear is fixed on the lower plate surface of the right gate plate; the driving end of the left gate plate driving mechanism is hinged to the left connecting ear; the driving end of the right gate plate driving mechanism is hinged to the right connecting ear.

[0016] The beneficial effects of the above technical solution are as follows: The driving end of the gate plate driving mechanism is hinged to the connecting ear on the lower plate surface of the gate plate, that is, the driving end of the gate plate driving mechanism is stacked below the gate plate, and the driving end does not separately occupy the space of the plug valve along the translation direction of the plug, which can make the overall structure of the plug valve more compact.

[0017] As a further improvement of the above technical solution, both the left gate plate driving mechanism and the right gate plate driving mechanism are cylinders or hydraulic cylinders.

[0018] As a further improvement of the above technical solution, there are two gate plate guide rails, the two gate plate guide rails are arranged horizontally opposite to each other, and the feeding port and the discharging port are arranged corresponding to the space between the two gate plate guide rails.

[0019] The beneficial effects of the above technical solution are as follows: The two gate plate guide rails are located on both sides of the discharging port in the horizontal direction, that is, not directly below the discharging port, which can prevent the falling of material particles from being blocked.

[0020] As a further improvement of the above technical solution, the gate plate guide rail is a rectangular gate plate guide rail, and one of its long edges is arranged corresponding to the upper wall surface of the inner cavity to form a triangular gate plate guide rail surface at the upper part of the gate plate guide rail; a triangular chute adapted to the triangular gate plate guide rail surface is opened along the length direction of the gate plate guide rail at the lower end of the gate plate assembly; the inner wall surface of the triangular chute is slidably attached to the triangular gate plate guide rail surface.

[0021] The beneficial effects of the above technical solution are as follows: The rectangular gate plate guide rail has higher structural strength. Using two adjacent side surfaces of the rectangular gate plate guide rail as the guide rail surfaces and forming a triangular gate plate guide rail surface can prevent material particles from accumulating on the guide rail surface; the inner wall surface of the triangular chute is slidably attached to the triangular gate plate guide rail surface, which can play a role in scraping the guide rail surface during sliding and avoid jamming.

[0022] As a further improvement of the above technical solution, a filling groove is opened on the triangular gate plate guide rail surface, and a graphite body for lubricating the triangular gate plate guide rail surface is filled in the filling groove.

[0023] The beneficial effects of the above technical solution are as follows: The graphite body filled in the filling groove can play a role in lubricating the guide rail surface, further improving the smoothness of the opening and closing of the gate plate; and as the guide rail surface gradually wears, the graphite body in the filling groove can continuously play a role in lubricating the guide rail surface, improving the durability of the knife gate valve.

[0024] As a further improvement of the above technical solution, an upper connecting flange is fixedly installed on the outer wall of the valve housing corresponding to the feed inlet, and a lower connecting flange is fixedly installed on the outer wall of the valve housing corresponding to the discharge outlet.

[0025] The beneficial effects of the above technical solution are as follows: The upper connecting flange facilitates the connection of the upper input pipeline; the lower connecting flange facilitates the connection of the lower output pipeline, improving the installation convenience of the knife gate valve.

[0026] As a further improvement of the above technical solution, the lower part of the valve housing is funnel-shaped.

[0027] The beneficial effects of the above technical solution are as follows: The lower part of the valve housing is funnel-shaped, which is conducive to the discharge of the material particles in the inner cavity from the discharge outlet.

[0028] It can be seen from the above technical solutions that compared with the prior art, the present utility model discloses a knife gate valve, which has the following advantages and beneficial effects:

[0029] 1. The gate plate assembly of the knife gate valve of the present utility model is supported by the gate guide rail, and its upper plate surface is adapted to closely adhere to the upper wall surface of the inner cavity, effectively preventing particulate matter from entering the gap between the gate plate and the upper wall of the inner cavity, and avoiding gate plate jamming; the structure is simpler and more compact, reducing the manufacturing cost.

[0030] 2. The upper part of the gate guide rail of the knife gate valve of the present utility model is a triangular gate guide rail surface, which can prevent the accumulation of material particles, and the guide rail surface is embedded with a graphite body, further playing a role in lubricating the guide rail and improving the service life of the knife gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings according to the provided drawings without creative efforts.

[0032] Figure 1 Schematic diagram of the overall structure of a knife gate valve of the present utility model;

[0033] Figure 2 Schematic top view of the structure of a knife gate valve of the present utility model;

[0034] Figure 3Schematic side view of the structure of a knife gate valve of the present utility model;

[0035] Figure 4 Schematic top view of the left gate plate structure of a knife gate valve of the present utility model;

[0036] Figure 5 Schematic side view of the left gate plate structure of a knife gate valve of the present utility model;

[0037] Figure 6 Schematic front view of the gate plate guide rail of a knife gate valve of the present utility model;

[0038] Figure 7 Cross-sectional view of the gate plate guide rail of a knife gate valve of the present utility model in the vertical length direction;

[0039] In the figure: 1. Valve housing; 11. Inner cavity; 12. Feeding port; 13. Discharging port; 14. Upper connecting flange; 15. Lower connecting flange; 2. Gate plate mechanism; 21. Gate plate assembly; 211. Left gate plate; 2111. Wedge-shaped body one; 212. Right gate plate; 2121. Wedge-shaped body two; 213. Left connecting ear; 214. Right connecting ear; 215. Strip-shaped slider; 2151. Triangular chute; 22. Gate plate guide rail; 221. Triangular gate plate guide rail surface; 2211. Filling groove; 23. Gate plate driving mechanism; 231. Left gate plate driving mechanism; 232. Right gate plate driving mechanism. Detailed implementation mode

[0040] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present utility model, but should not be construed as a limitation of the present utility model.

[0041] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality of" means two or more, unless otherwise specifically defined.

[0043] In the present utility model, unless otherwise clearly specified and defined, terms such as "installed", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0044] As Figures 1 to 7 shown, this embodiment provides a flap valve, which includes a valve housing 1. The valve housing 1 has an inner cavity 11. The upper wall of the inner cavity 11 is provided with a feed port 12, and the lower wall of the inner cavity 11 is provided with a discharge port 13. It further includes:

[0045] A gate mechanism 2, which includes a gate assembly 21, a gate guide rail 22, and a gate driving mechanism 23. The gate guide rail 22 is installed in the inner cavity 11 and arranged parallel to the upper wall surface of the inner cavity 11. The lower plate surface of the gate assembly 21 is slidably connected along the length direction of the gate guide rail 22 and fits snugly on the gate guide rail 22. The upper plate surface of the gate assembly 21 slides and fits snugly on the upper wall surface of the inner cavity 11. The fixed end of the gate driving mechanism 23 is sealed and installed on the outer wall of the valve housing 1. The driving end of the gate driving mechanism 23 penetrates the outer wall of the valve housing 1 and extends into the inner cavity 11 and is drivingly connected to the gate assembly 21 to drive the gate assembly 21 to translate, thereby gradually blocking or opening the feed port 12.

[0046] The upper plate surface of the gate assembly 21 of the flap valve in this embodiment fits snugly against the upper wall surface of its inner cavity 11, which can prevent particulate matter from entering and getting stuck. The lower plate surface of the gate assembly 21 slides and fits tightly on the gate guide rail 22, and can sweep the guide rail surface when moving, which can prevent particulate matter from getting stuck on the guide rail surface. The feed port 12, the inner cavity 11, and the discharge port 13 of the flap valve are connected in sequence to form a vertical falling material channel. By controlling the translation of the gate assembly 21 through the gate driving mechanism 23, the feed port 12 can be blocked or opened, and finally the opening and closing of the flap valve can be realized. The flap valve of the present utility model can avoid particulate matter from hindering the movement of the gate and effectively prevent the gate from jamming.

[0047] In some embodiments, the gate assembly 21 includes a left gate 211 and a right gate 212; the gate driving mechanism 23 includes a left gate driving mechanism 231 and a right gate driving mechanism 232;

[0048] The left gate 211 and the right gate 212 are oppositely arranged along the length direction of the gate guide rail 22, and their upper plate surfaces are all slidably and fittingly attached to the upper wall surface of the inner cavity 11, and their lower parts are all slidably connected along the length direction of the gate guide rail 22 and fittingly attached to the upper part of the gate guide rail 22; the left gate driving mechanism 231 and the right gate driving mechanism 232 are symmetrically arranged on two opposite side walls of the valve housing 1; the driving end of the left gate driving mechanism 231 is drivingly connected to the left gate 211, and the driving end of the right gate driving mechanism 232 is drivingly connected to the right gate 212 to drive the left gate 211 and the right gate 212 to slide along the length direction of the gate guide rail 22 and cooperate to open and close the feed port 12.

[0049] By providing the left gate 211 and the right gate 212 and opening and closing the feed port 12 in the way of the two gates opening in opposite directions, the opening and closing speed of the plug valve can be increased, and the control accuracy of the flow rate is improved.

[0050] In some embodiments, the side end of the left gate 211 close to the right gate 212 has a chamfer to form a first wedge body 2111; the side end of the right gate 212 close to the left gate 211 has a chamfer to form a second wedge body 2121; the first wedge body 2111 and the second wedge body 2121 can abut and overlap vertically.

[0051] When the first wedge body 2111 of the left gate 211 and the second wedge body 2121 of the right gate 212 are abutted and closed in a fitting manner, the closing performance of the gate is improved through the vertically overlapping closing method.

[0052] Specifically, both the left gate 211 and the right gate 212 are rectangular plates. The lower plate surface of the left gate 211 forms a first wedge body 2111 by chamfering near the end of the right gate 212; the upper plate surface of the right gate 212 forms a second wedge body 2121 by chamfering near the end of the left gate 211.

[0053] In some embodiments, a left connecting ear 213 is fixed to the lower plate surface of the left gate 211; a right connecting ear 214 is fixed to the lower plate surface of the right gate 212; the driving end of the left gate driving mechanism 231 is hinged to the left connecting ear 213; the driving end of the right gate driving mechanism 232 is hinged to the right connecting ear 214.

[0054] The driving end of the gate driving mechanism is hinged at the connecting ear on the lower plate surface of the gate, that is, the driving end of the gate driving mechanism is stacked below the gate, and the driving end does not separately occupy the space of the plug valve along the plug translation direction, which can make the overall structure of the plug valve more compact.

[0055] In some embodiments, both the left gate driving mechanism 231 and the right gate driving mechanism 232 are cylinders or hydraulic cylinders.

[0056] Specifically, a piston rod passing through hole is formed in the outer wall of the valve housing 1; the cylinder bodies of the left gate driving mechanism 231 and the right gate driving mechanism 232 are fixed by flanges and are hermetically installed on the outer wall surface of the valve housing 1 through sealing rings. Their piston rods correspondingly penetrate through the piston rod passing through hole in the outer wall of the valve housing 1 and extend into the inner cavity to form a driving end. The end of the piston rod located in the inner cavity is hinged to the corresponding connecting ear through a pin shaft. Since the cylinder bodies of the left gate driving mechanism 231 and the right gate driving mechanism 232 seal the corresponding piston rod passing through holes, it can prevent the material in the valve housing 1 from leaking from the piston rod passing through holes.

[0057] In some embodiments, there are two gate guide rails 22, and the two gate guide rails 22 are arranged horizontally opposite to each other, and the feed inlet 12 and the discharge outlet 13 are arranged corresponding to the space between the two gate guide rails 22.

[0058] The two gate guide rails 22 are located on both sides of the discharge outlet 13 in the horizontal direction, that is, not directly below the discharge outlet 13, which can prevent the falling of material particles from being blocked.

[0059] In some embodiments, the gate guide rail 22 is a rectangular gate guide rail, and one of its long edges is arranged corresponding to the upper wall surface of the inner cavity 11, so as to form a triangular gate guide rail surface 221 above the gate guide rail 22; a triangular chute 2151 adapted to the triangular gate guide rail surface 221 is formed along the length direction of the lower end of the gate assembly 21; the inner wall surface of the triangular chute 2151 is slidably attached to the triangular gate guide rail surface 221.

[0060] The rectangular gate guide rail has higher structural strength. By using two adjacent side surfaces of the rectangular gate guide rail as the guide rail surfaces and forming the triangular gate guide rail surface 221, it can prevent material particles from accumulating on the guide rail surface; the inner wall surface of the triangular chute 2151 is slidably attached to the triangular gate guide rail surface 221, so as to play a role of scraping the guide rail surface during sliding and avoid jamming.

[0061] Specifically, the gate assembly 21 includes a left gate 211 and a right gate 212. On the lower plate surfaces of the left gate 211 and the right gate 212, two strip-shaped sliders 215 are fixed along the length direction of the gate guide rail 22; the two strip-shaped sliders 215 are arranged in parallel and spaced relative to each other; at the bottom end of each strip-shaped slider 215, a triangular chute 2151 adapted to the triangular gate guide rail surface 221 is provided along the length direction of the gate guide rail 22; at both ends of the left gate 211 and the right gate 212 in the sliding direction and corresponding to the two open ends of the triangular chute 2151, a guide rail seal adapted to the triangular gate guide rail surface 221 is fixedly installed by screws. The guide rail seal slides and fits on the triangular gate guide rail surface 221 and can slide and sweep along the length direction of the triangular gate guide rail surface 221 to further prevent materials or impurity particles from entering the fitting gap between the triangular chute 2151 and the triangular gate guide rail surface 221. The guide rail seal is made of rubber and can be selected from existing products or customized.

[0062] In some embodiments, a filling groove 2211 is provided on the triangular gate guide rail surface 221, and a graphite body for lubricating the triangular gate guide rail surface 221 is filled in the filling groove 2211.

[0063] The graphite body filled in the filling groove 2211 can play a role in lubricating the guide rail surface, further improving the smoothness of the opening and closing of the gate; and as the guide rail surface is gradually worn, the graphite body in the filling groove 2211 can continuously play a role in lubricating the guide rail surface, improving the durability of the knife gate valve.

[0064] Specifically, the gate guide rail 22 can be made of square steel pipes. Square through holes for inserting the gate guide rail 22 are provided on the opposite side walls of the valve housing 1. During installation, the two ends of the gate guide rail 22 are respectively inserted into the corresponding square through holes and fixed in the square through holes on the wall of the valve housing 1 by welding. Inserting the two ends of the gate guide rail 22 into the square through holes on the side wall of the valve housing 1 improves the support strength of the guide rail.

[0065] In some embodiments, an upper connecting flange 14 is fixedly installed on the outer wall of the valve housing 1 corresponding to the feed inlet 12, and a lower connecting flange 15 is fixedly installed on the outer wall of the valve housing 1 corresponding to the discharge outlet 13.

[0066] The upper connecting flange 14 facilitates the connection of the upper input pipeline; the lower connecting flange 15 facilitates the connection of the lower output pipeline, improving the installation convenience of the knife gate valve.

[0067] In some embodiments, the lower part of the valve housing 1 is funnel-shaped.

[0068] Specifically, the valve housing 1 is made by welding steel plates.

[0069] The lower part of the valve housing 1 being funnel-shaped facilitates the discharge of the material particles in the inner cavity from the discharge outlet 13.

[0070] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations 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. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0071] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A flap valve, comprising a valve housing (1), the valve housing (1) having an inner cavity (11), a feed port (12) provided on the upper wall of the inner cavity (11), and a discharge port (13) provided on the lower wall of the inner cavity (11); characterized in that, It further includes: A gate mechanism (2), the gate mechanism (2) includes a gate assembly (21), a gate guide rail (22) and a gate driving mechanism (23); the gate guide rail (22) is installed in the inner cavity (11) and arranged parallel to the upper wall surface of the inner cavity (11); the lower plate surface of the gate assembly (21) is slidably connected along the length direction of the gate guide rail (22) and is adapted to fit on the gate guide rail (22), and the upper plate surface of the gate assembly (21) is slid and adapted to fit on the upper wall surface of the inner cavity (11); the fixed end of the gate driving mechanism (23) is sealed and installed on the outer wall of the valve housing (1), and the driving end of the gate driving mechanism (23) penetrates the outer wall of the valve housing (1) and extends into the inner cavity (11) and is drivingly connected to the gate assembly (21) to drive the gate assembly (21) to translate, thereby gradually blocking or opening the feed port (12).

2. The plug valve according to claim 1, wherein The gate assembly (21) includes a left gate (211) and a right gate (212); the gate driving mechanism (23) includes a left gate driving mechanism (231) and a right gate driving mechanism (232); The left gate (211) and the right gate (212) are arranged oppositely along the length direction of the gate guide rail (22), and their upper plate surfaces are both slid and adapted to fit on the upper wall surface of the inner cavity (11), and their lower parts are both slidably connected along the length direction of the gate guide rail (22) and are adapted to fit on the upper part of the gate guide rail (22); the left gate driving mechanism (231) and the right gate driving mechanism (232) are symmetrically arranged on two opposite side walls of the valve housing (1); the driving end of the left gate driving mechanism (231) is drivingly connected to the left gate (211), and the driving end of the right gate driving mechanism (232) is drivingly connected to the right gate (212) to drive the left gate (211) and the right gate (212) to slide along the length direction of the gate guide rail (22) and cooperate to open and close the feed port (12).

3. The plug valve according to claim 2, wherein, The side end of the left gate (211) close to the right gate (212) has a chamfer to form a first wedge body (2111); the side end of the right gate (212) close to the left gate (211) has a chamfer to form a second wedge body (2121); the first wedge body (2111) and the second wedge body (2121) can abut and overlap vertically.

4. The plug valve according to claim 2, wherein, A left connecting ear (213) is fixed on the lower plate surface of the left gate (211); a right connecting ear (214) is fixed on the lower plate surface of the right gate (212); the driving end of the left gate driving mechanism (231) is hinged to the left connecting ear (213); the driving end of the right gate driving mechanism (232) is hinged to the right connecting ear (214).

5. The plug valve according to claim 2, wherein Both the left gate driving mechanism (231) and the right gate driving mechanism (232) are cylinders or hydraulic cylinders.

6. The plug valve according to claim 1, wherein There are two gate guide rails (22), and the two gate guide rails (22) are horizontally arranged oppositely, and the feed port (12) and the discharge port (13) are arranged corresponding to the space between the two gate guide rails (22).

7. The plug valve according to claim 1, wherein The gate guide rail (22) is a rectangular gate guide rail, and one of its long edges is arranged corresponding to the upper wall surface of the inner cavity (11) to form a triangular gate guide rail surface (221) at the upper part of the gate guide rail (22); a triangular chute (2151) adapted to the triangular gate guide rail surface (221) is formed at the lower end of the gate assembly (21) along the length direction of the gate guide rail (22); the inner wall surface of the triangular chute (2151) is slidably attached to the triangular gate guide rail surface (221).

8. The plug valve according to claim 7, characterized in that, A filling groove (2211) is formed on the triangular gate guide rail surface (221), and a graphite body for lubricating the triangular gate guide rail surface (221) is filled in the filling groove (2211).

9. The plug valve according to claim 1, wherein, An upper connecting flange (14) is fixedly installed on the outer wall of the valve housing (1) corresponding to the feeding port (12), and a lower connecting flange (15) is fixedly installed on the outer wall of the valve housing (1) corresponding to the discharging port (13).

10. The plug valve according to claim 1, wherein, The lower part of the valve housing (1) is funnel-shaped.

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