Gate valve

Abstract

The invention discloses a gate valve which comprises a valve body provided with a circulation channel and a first opening and closing channel intersecting with the circulation channel and communicating with the circulation channel. The first valve group comprises a first valve plate, a first driving device and a first carrying pole beam; the first valve plate is movably arranged in the first opening and closing channel; the first driving device comprises a first driving piece and a second driving piece which are arranged on the two opposite sides of the first valve plate. The first carrying pole beam is hinged to the first valve plate, the first driving piece and the second driving piece. The first driving piece and the second driving piece can drive the first valve plate to move along the first opening and closing channel through the first carrying pole beam so as to close or open the circulation channel. The invention provides a gate valve to solve the problem that an existing valve is blocked to open and close.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and more specifically, to a flap valve. Background Art

[0002] The hydraulic flap valve uses a hydraulic cylinder as a driving device, and utilizes the pressure transmission of hydraulic oil to achieve the fast and stable movement of the valve plate, so as to achieve the precise control of fluid flow rate and the reliable sealing of the valve. The hydraulic flap valve has the advantages of strong driving ability, compact structure, simple operation, rapid opening and closing, precise control, good sealing performance and strong corrosion resistance, and is widely used in the engineering field.

[0003] Most existing hydraulic flap valves use multiple hydraulic cylinders as transmission devices. However, during operation, there are deficiencies in structural design, sealing performance, control accuracy, etc. of the multiple hydraulic cylinder transmissions, and there are errors, etc., which easily lead to problems such as blockage in the opening and closing of the valve, and it is difficult to meet the requirements under some specific working conditions. At present, for this problem, most of the solutions adopted are to fixedly connect the hydraulic plug column with high-strength materials and solve this problem by means of the rigidity of the fixing material. But there are problems such as high requirements for materials and high manufacturing costs.

[0004] Therefore, in order to ensure the stable and continuous operation of the hydraulic flap valve under different working condition requirements, currently, there is an urgent need to develop a flap valve that can overcome the problem of easy blockage in the opening and closing of the valve during the transmission of the hydraulic cylinder. Summary of the Invention

[0005] In view of this, the purpose of the present application is to propose a flap valve to solve the problem of blockage in the opening and closing of the existing valve.

[0006] Based on the above purpose, a flap valve provided by the present application includes:

[0007] A valve body, the valve body has a flow channel and a first opening and closing channel that intersects and communicates with the flow channel;

[0008] A first valve component group, the first valve component group includes: a first valve plate, a first driving device and a first balance beam. The first valve plate is movably arranged in the first opening and closing channel; the first driving device includes a first driving member and a second driving member arranged on opposite sides of the first valve plate; the first balance beam is respectively hinged to the first valve plate, the first driving member and the second driving member;

[0009] The first driving member and the second driving member can drive the first valve plate to move along the first opening and closing channel through the first balance beam to close or open the flow channel.

[0010] Optionally, a first central connection ear is provided at the central position of the first balance beam along the length direction, a first drive connection ear and a second drive connection ear are respectively provided at both ends of the first balance beam along the length direction, and the first drive connection ear and the second drive connection ear are symmetrically arranged relative to the first central connection ear; the first central connection ear is hinged to the first valve plate, and the first drive connection ear and the second drive connection ear are respectively hinged to the first drive member and the second drive member.

[0011] Optionally, both the first drive member and the second drive member are hydraulic cylinders.

[0012] Optionally, the ends of the first drive member and the second drive member away from the first balance beam are fixedly connected or hinged.

[0013] Optionally, the first valve component group further includes a first limiting member and a second limiting member; the first limiting member is arranged on the running path of the first drive member to limit the running stroke of the first drive member; the second limiting member is arranged on the running path of the second drive member to limit the running stroke of the second drive member.

[0014] Optionally, at least one of the first limiting member and the second limiting member is a travel switch.

[0015] Optionally, the plug valve further includes a control device, and the control device is respectively connected to the travel switch, the first drive member and the second drive member to control the operation of the first drive member and the second drive member through the received signal of the travel switch.

[0016] Optionally, the travel switch includes one or a combination of a touch switch, a light sensor switch, and a magnetic sensor switch.

[0017] Optionally, relative to the flow passage, the valve body further has a second opening and closing passage symmetrically arranged with the first opening and closing passage, and further includes a second valve component group arranged in cooperation with the second opening and closing passage;

[0018] The second valve component group includes: a second valve plate, a second drive device, and a second balance beam. The second valve plate is movably arranged in the second opening and closing passage; the second drive device includes a third drive member and a fourth drive member arranged on opposite sides of the second valve plate; the second balance beam is respectively hinged to the second valve plate, the third drive member, and the fourth drive member;

[0019] The third drive member and the fourth drive member can drive the second valve plate to move along the second opening and closing passage through the second balance beam to cooperate with the first valve component group to close or open the flow passage.

[0020] Optionally, one end of the third driving member and the fourth driving member away from the second crossbeam is fixedly connected or hinged; alternatively, one end of the third driving member away from the second crossbeam is hinged to one end of the first driving member away from the first crossbeam; or one end of the fourth driving member away from the second crossbeam is hinged to one end of the second driving member away from the first crossbeam.

[0021] As can be seen from the above, compared with the prior art, the plug valve provided by the present application has the following advantages: by adopting the above plug valve and hinging the crossbeam, when there is a deviation in the operating speeds of the driving members on both sides, the crossbeam can rotate and shift, correcting the operating direction of the valve plate, thereby ensuring that the valve plate can still move along the correct path, ensuring the normal operation of the plug valve, and ensuring the function of the plug valve. Description of the Drawings

[0022] By describing its embodiments in conjunction with the following drawings, the above features and technical advantages of the present application will become clearer and easier to understand.

[0023] Figure 1 It is a schematic plan view of the plug valve adopted in the specific embodiment of the present application.

[0024] Figure 2 It is a schematic view of the swinging state of the crossbeam adopted in the specific embodiment of the present application.

[0025] Among them, the reference numerals:

[0026] 10: valve body; 11: flow passage; 12: first opening and closing passage; 13: second opening and closing passage; 14: hinge pin.

[0027] 20: first valve plate; 21: first driving member; 22: second driving member; 23: first crossbeam; 231: first central connection ear; 232: first driving connection ear; 233: second driving connection ear; 24: first limiting member; 25: second limiting member.

[0028] 30: second valve plate; 31: third driving member; 32: fourth driving member; 33: second crossbeam; 331: second central connection ear; 332: third driving connection ear; 333: fourth driving connection ear; 34: third limiting member; 35: fourth limiting member. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the following further elaborates on this application in detail with reference to specific embodiments and the accompanying drawings. Identical components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper", and "lower" used in the following description refer to the directions in the drawings. The terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component.

[0030] Figure 1 This is a schematic plan view of the plug valve adopted in the specific embodiment of this application. Figure 2 This is a schematic diagram of the swinging state of the balance beam adopted in the specific embodiment of this application. As Figure 1 and Figure 2 shown. A plug valve provided by this application includes: a valve body 10 and a first valve component group.

[0031] The plug valve includes: a valve body 10; the valve body 10 has a fluid passage 11 and a first opening and closing passage 12 that intersects and communicates with the fluid passage 11. The valve body 10 includes, but is not limited to, a cylindrical body structure or a four-way structure. There are various ways to arrange the fluid passage 11 and the first opening and closing passage 12. In one embodiment of this application, as Figure 1 shown, the direction perpendicular to the paper surface is the extending direction of the fluid passage 11, and the left-right direction is the extending direction of the first opening and closing passage 12.

[0032] The right end of the valve body 10 can be a closed structure or an open structure. When the right end of the valve body 10 is a closed structure, the opening and closing of the fluid passage 11 can be achieved by the first valve component group provided. If the right end of the valve body 10 is an open structure, a sealing member can be provided to form a closed structure, or a second valve component group can be correspondingly provided, and the opening and closing of the fluid passage 11 can be achieved by the cooperation of the second valve component group and the first valve component group.

[0033] In this application, first, the technical solution provided by this application is introduced by taking the right end of the valve body 10 as a closed structure as an example, and then, it is introduced by taking the right end of the valve body 10 as an open structure as an example.

[0034] Taking the right end of the valve body 10 as a closed structure as an example, the plug valve further includes a first valve component group, and the first valve component group includes: a first valve plate 20, a first driving device, and a first balance beam 23.

[0035] The first valve plate 20 is movably arranged in the first opening and closing channel 12, and the first valve plate 20 can move along the extending direction of the first opening and closing channel 12, so as to move into or out of the fluid channel 11. The first driving device includes a first driving member 21 and a second driving member 22 arranged on opposite sides of the first valve plate 20; the first balance beam 23 is respectively hinged to the first valve plate 20, the first driving member 21 and the second driving member 22; wherein, the first driving member 21 and the second driving member 22 can drive the first valve plate 20 to move along the first opening and closing channel 12 through the first balance beam 23, so as to close or open the fluid channel 11.

[0036] Taking Figure 1 the direction in the middle as an example, the first driving member 21 and the second driving member 22 drive the first balance beam 23 to move to the right. While the first balance beam 23 is moving, it can drive the first valve plate 20 to move to the right, so that the first valve plate 20 gradually moves into the fluid channel 11, thereby realizing the control of the flow rate of the fluid in the fluid channel 11. When the first valve plate 20 moves to the right to a preset position, the first valve plate 20 can completely close the fluid channel 11, that is, the plug valve is closed.

[0037] Correspondingly, the first driving member 21 and the second driving member 22 drive the first balance beam 23 to move to the left. While the first balance beam 23 is moving, it can drive the first valve plate 20 to move to the left, so that the first valve plate 20 gradually moves out of the fluid channel 11, thereby realizing the opening of the fluid channel 11 and the control of the flow rate of the fluid in the fluid channel 11. When the first valve plate 20 moves to the left to a preset position, the first valve plate 20 can completely open the fluid channel 11, that is, the plug valve is fully opened.

[0038] When the plug valve is being opened or closed, if there is a deviation in the driving speed of the first driving member 21 and the second driving member 22, and if the articulated first balance beam 23 is not provided, the position of the first valve plate 20 may shift upward or downward, resulting in hard friction between the first valve plate 20 and the valve body 10, and the situation of the first valve plate 20 being blocked in movement, affecting the accuracy and function of the plug valve.

[0039] By hinging the first balance beam 23, when there is a deviation in the running speed of the driving members on both sides (i.e., the first driving member 21 and the second driving member 22), the first balance beam 23 can rotate and shift, and the shifting mode is as Figure 2 shown, thereby correcting the running direction of the first valve plate 20, avoiding the first valve plate 20 from shifting, and further ensuring that the first valve plate 20 can still move along the correct path, ensuring the normal operation of the plug valve, so as to ensure the function of the plug valve.

[0040] With the above-mentioned flap valve, by means of the articulated balance beam, when there is a deviation in the operating speeds of the driving components on both sides, the balance beam can rotate and shift, correcting the moving direction of the valve plate, thus ensuring that the valve plate can still move along the correct path, guaranteeing the normal operation of the flap valve and ensuring its function.

[0041] To further ensure the uniform stress of the first balance beam 23, optionally, a first central connecting ear 231 is provided at the central position of the first balance beam 23 along the length direction, and a first driving connecting ear 232 and a second driving connecting ear 233 are respectively provided at both ends of the first balance beam 23 along the length direction. The first driving connecting ear 232 and the second driving connecting ear 233 are symmetrically arranged relative to the first central connecting ear 231; the first central connecting ear 231 is hinged to the first valve plate 20, and the first driving connecting ear 232 and the second driving connecting ear 233 are respectively hinged to the first driving component 21 and the second driving component 22. The hinged manner of the first balance beam 23 includes but is not limited to being achieved through a hinge pin 14.

[0042] With the above-mentioned first balance beam 23, the lever arms of the driving forces applied by the first driving component 21 and the second driving component 22 to the first valve plate 20 are the same. When the first driving component 21 and the second driving component 22 apply forces synchronously, the forces applied to the first balance beam 23 can be evenly transmitted to the first valve plate 20, enabling the first valve plate 20 to move normally and preventing the first valve plate 20 from shifting.

[0043] At the same time, the rotation angle and yaw amount of the first balance beam 23 can also be obtained. Refer to Figure 2 , assuming the length of the first balance beam 23 is 2X, the stroke of the first valve plate 20 is Z, and there is a deviation β% in the propulsion speeds between the first driving component 21 and the second driving component 22, then the rotation angle α of the first balance beam 23 can be calculated through Formula 1, and the yaw amount δ of the first balance beam 23 can be calculated through Formula 2.

[0044]

[0045] δ = (1 - cosα) × x (Formula 2)

[0046] Based on the rotation angle α and yaw amount δ of the first balance beam 23, the propulsion speeds of the first driving component 21 and the second driving component 22 can be controlled, so that the propulsion speeds of the first driving component 21 and the second driving component 22 tend to be synchronous, reducing the operating deviation of the first valve plate 20.

[0047] The first driving component 21 and the second driving component 22 include but are not limited to hydraulic cylinders. Optionally, both the first driving component 21 and the second driving component 22 are hydraulic cylinders. Using hydraulic cylinders is easy to operate and convenient to control.

[0048] Optionally, the ends of the first driving member 21 and the second driving member 22 away from the first balance beam 23 are fixedly connected or hinged. When connected in a fixed manner, the position stability of the driving member can be ensured, so that the driving member can output driving force better and more effectively. When connected in a hinged manner, when there is a deviation in the driving speed of the first driving member 21 and the second driving member 22, in addition to the first balance beam 23 being able to rotate and generate an offset to correct the running direction of the first valve plate 20, based on the hinged connection manner of the first driving member 21 and the second driving member 22, the first driving member 21 and the second driving member 22 can swing at a certain angle, thereby correcting the running direction of the first valve plate 20 and preventing the first valve plate 20 from shifting. The hinged manner of the first driving member 21 and the second driving member 22 includes, but is not limited to, being hinged through a hinge pin 14.

[0049] To prevent the extending stroke of the first valve plate 20 from being too large, optionally, the first valve member group further includes a first limiting member 24 and a second limiting member 25; the first limiting member 24 is arranged on the running path of the first driving member 21 to limit the running stroke of the first driving member 21; the second limiting member 25 is arranged on the running path of the second driving member 22 to limit the running stroke of the second driving member 22. Taking the driving member as a hydraulic cylinder as an example, the hydraulic cylinder drives the balance beam by extending or retracting the driving rod. If not restricted, the driving rod may extend too long, causing the first valve plate 20 to disengage from the first opening and closing channel 12, resulting in the plug valve being unusable. By providing the limiting members in this application, the running stroke length of the driving member can be effectively restricted, thereby preventing the first valve plate 20 from disengaging.

[0050] There are various implementation manners of the first limiting member 24 and the second limiting member 25. In an embodiment of the present application, the first limiting member 24 and the second limiting member 25 can be fixed blocks. When the driving member drives the first balance beam 23 to extend and touches the fixed member, it will be subject to corresponding resistance. When the resistance value reaches or exceeds the preset threshold, it indicates that the first balance beam 23 has reached the maximum distance of the stroke, and the driving member stops driving.

[0051] Optionally, at least one of the first limiting member 24 and the second limiting member 25 is a travel switch. The first limiting member 24 and the second limiting member 25 can be fixed blocks, can also be travel switches, or can be a combination of fixed blocks and travel switches. When the limiting member is a travel switch, when the driving member drives the first balance beam 23 to extend and triggers the travel switch, the travel switch makes a corresponding response and generates or emits a response signal, indicating that the first balance beam 23 has reached the maximum distance of the stroke, and the driving member stops driving.

[0052] The travel switch can be used in cooperation with the control device of the plug valve. Optionally, the plug valve further includes a control device, which is respectively connected to the travel switch, the first driving member 21 and the second driving member 22 to control the operation of the first driving member 21 and the second driving member 22 through the received signal of the travel switch. The control device is used to control the start and stop, operation mode of the first driving member 21 and the second driving member 22, and can also control the driving speed of the first driving member 21 and the second driving member 22. When the driving member drives the first balance beam 23 to extend and trigger the travel switch, the travel switch makes a corresponding response, generates or emits a response signal, and transmits the signal to the control device to perform corresponding control on the first driving member 21 and the second driving member 22, such as controlling the driving member to stop driving.

[0053] Optionally, the travel switch includes one or a combination of a touch switch, a light sensor switch, and a magnetic sensor switch. When the travel switch is a touch switch, the first balance beam 23 can trigger the touch switch by touching. When the travel switch is a light sensor switch, the first balance beam 23 can trigger the light sensor switch by blocking or opening the light path. When the travel switch is a magnetic sensor switch, the first balance beam 23 can trigger the magnetic sensor switch by changing the magnetic field.

[0054] The above content is introduced by taking the right end of the valve body 10 as a closed structure as an example. Next, the right end of the valve body 10 will be introduced as an open structure as an example. If the right end of the valve body 10 is an open structure, a sealing member can be set to form a closed structure. In this way, the implementation method of the plug valve can refer to the above content and will not be elaborated here one by one.

[0055] When the right end of the valve body 10 is an open structure, a second valve component group can also be correspondingly set, and the opening and closing of the fluid passage 11 can be realized by the cooperation of the second valve component group and the first valve component group. The following is an introduction in the way of setting the second valve component group.

[0056] Optionally, relative to the fluid passage 11, the valve body 10 further has a second opening and closing passage 13 symmetrically arranged with the first opening and closing passage 12, and further includes a second valve component group arranged in cooperation with the second opening and closing passage 13. The implementation method of the second opening and closing passage 13 and the second valve component group can refer to the first opening and closing passage 12 and the first valve component group. The difference is only that, relative to Figure 1 the center line of the valve body 10, the second opening and closing passage 13 is symmetrically arranged with the first opening and closing passage 12, and the corresponding components in the second valve component group are symmetrically arranged with the corresponding components in the first valve component group.

[0057] The second valve assembly includes: a second valve plate 30, a second driving device, and a second balance beam 33. The second valve plate 30 is movably arranged in the second opening and closing channel 13. The second valve plate 30 can move along the extension direction of the second opening and closing channel 13, so as to move into or out of the fluid channel 11. When the second valve plate 30 moves into the fluid channel 11, it can cooperate with the first valve plate 20 to control the flow rate of the fluid in the fluid channel 11 or close the fluid channel 11. When the second valve plate 30 moves out of the fluid channel 11, it can cooperate with the first valve plate 20 to control the flow rate of the fluid in the fluid channel 11 or open the fluid channel 11.

[0058] The second driving device includes a third driving member 31 and a fourth driving member 32 arranged on opposite sides of the second valve plate 30. The second balance beam 33 is hinged to the second valve plate 30, the third driving member 31, and the fourth driving member 32 respectively. Wherein, the third driving member 31 and the fourth driving member 32 can drive the second valve plate 30 to move along the second opening and closing channel 13 through the second balance beam 33, so as to cooperate with the first valve assembly to close or open the fluid channel 11. The third driving member 31 and the fourth driving member 32 include but are not limited to hydraulic cylinders.

[0059] The first driving device and the second driving device can operate synchronously to Figure 1 Taking the middle direction as an example, while the third driving member 31 and the fourth driving member 32 drive the second balance beam 33 to move leftward, the first driving member 21 and the second driving member 22 drive the first balance beam 23 to move rightward.

[0060] While the second balance beam 33 moves, it can drive the second valve plate 30 to move leftward, so that the second valve plate 30 gradually moves into the fluid channel 11, thereby realizing the control of the flow rate of the fluid in the fluid channel 11. When the second valve plate 30 moves leftward to a preset position, the second valve plate 30 contacts the first valve plate 20, and the second valve plate 30 cooperates with the first valve plate 20 to completely close the fluid channel 11, that is, the plug valve is closed.

[0061] Correspondingly, while the third driving member 31 and the fourth driving member 32 drive the balance beam to move rightward, the first driving member 21 and the second driving member 22 drive the first balance beam 23 to move leftward.

[0062] While the second balance beam 33 moves, it can drive the second valve plate 30 to move rightward, so that the second valve plate 30 gradually moves out of the fluid channel 11, thereby realizing the opening of the fluid channel 11 and controlling the flow rate of the fluid in the fluid channel 11. When the second valve plate 30 moves rightward to a preset position, the first valve plate 20 and the second valve plate 30 can completely open the fluid channel 11, that is, the plug valve is fully opened.

[0063] When the plug valve is being opened or closed, if there is a deviation in the driving speeds of the third driving member 31 and the fourth driving member 32, and if the articulated second balance beam 33 is not provided, the position of the second valve plate 30 may shift upward or downward, resulting in hard friction between the second valve plate 30 and the valve body 10, and the situation of the second valve plate 30 being blocked during movement, affecting the accuracy and function of the plug valve. By articulating the second balance beam 33, when there is a deviation in the operating speeds of the driving members on both sides (i.e., the third driving member 31 and the fourth driving member 32), the second balance beam 33 can rotate and generate an offset. The offset method can be referred to Figure 2 as shown, so as to correct the running direction of the second valve plate 30, avoid the second valve plate 30 from shifting, and further ensure that the second valve plate 30 can still move along the correct path, ensure the normal operation of the plug valve, and ensure the function of the plug valve.

[0064] To further ensure the uniform force on the second balance beam 33, along the length direction of the second balance beam 33, a second central connecting ear 331 is provided at the central position of the second balance beam 33, and a third driving connecting ear 332 and a fourth driving connecting ear 333 are respectively provided at both ends of the second balance beam 33. The third driving connecting ear 332 and the fourth driving connecting ear 333 are symmetrically arranged relative to the second central connecting ear 331; the second central connecting ear 331 is articulated with the second valve plate 30, the third driving connecting ear 332 is articulated with the third driving member 31, and the fourth driving connecting ear 333 is articulated with the fourth driving member 32. The articulation method of the second balance beam 33 includes but is not limited to being articulated through an articulation pin 14.

[0065] To achieve effective connection, optionally, the ends of the third driving member 31 and the fourth driving member 32 away from the second balance beam 33 are fixedly connected or articulated; or the end of the third driving member 31 away from the second balance beam 33 is articulated with the end of the first driving member 21 away from the first balance beam 23; or the end of the fourth driving member 32 away from the second balance beam 33 is articulated with the end of the second driving member 22 away from the first balance beam 23.

[0066] When connected in a fixed manner, the position stability of the third driving member 31 and the fourth driving member 32 can be ensured, so that the driving member can output the driving force better and more effectively. When the connection is achieved in a hinged manner, when there is a deviation in the driving speed of the third driving member 31 and the fourth driving member 32, in addition to the second balance beam 33 being able to rotate and generate an offset to correct the running direction of the second valve plate 30, based on the hinged connection manner of the third driving member 31 and the fourth driving member 32, the third driving member 31 and the fourth driving member 32 can swing at a certain angle, thereby correcting the running direction of the second valve plate 30 and preventing the second valve plate 30 from shifting. The hinged manner of the third driving member 31 and the fourth driving member 32 includes but is not limited to being hinged through the hinge pin 14.

[0067] To further reduce costs, when the connection is achieved in a hinged manner, the first driving member 21 and the third driving member 31 can be hinged through the same hinge pin 14, and the second driving member 22 and the fourth driving member 32 can be hinged through the same hinge pin 14, thereby reducing the use of the hinge pin 14 and effectively reducing costs.

[0068] Furthermore, the rotation angle and yaw amount of the second balance beam 33 can also be obtained through Formula 1 and Formula 2 in the above content. To prevent the extension stroke of the second valve plate 30 from being too large, the second valve assembly also further includes a third limiting member 34 and a fourth limiting member 35. The implementation manners of the third limiting member 34 and the fourth limiting member 35 can refer to the implementation manners of the first limiting member 24 and the second limiting member 25 in the above content, and will not be elaborated here one by one.

[0069] From the above description and practice, it can be seen that the plug valve provided by this application has the following advantages compared with the prior art: By adopting the above plug valve and hinging the balance beam, when there is a deviation in the running speed of the driving members on both sides, the balance beam can rotate and generate an offset to correct the running direction of the valve plate, thereby ensuring that the valve plate can still move along the correct path, ensuring the normal operation of the plug valve, and ensuring the function of the plug valve.

[0070] Those of ordinary skill in the art should understand that the above are only specific embodiments of this application and are not used to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the gist of this application shall be included within the protection scope of this application.

Claims

1. A flap valve, characterized in that, Comprising: A valve body having a flow passage and a first opening and closing passage intersecting and communicating with the flow passage; A first valve component group including a first valve plate, a first driving device, and a first balance beam. The first valve plate is movably disposed in the first opening and closing passage. The first driving device includes a first driving member and a second driving member disposed on opposite sides of the first valve plate. The first balance beam is respectively hinged to the first valve plate, the first driving member, and the second driving member; The first driving member and the second driving member can drive the first valve plate to move along the first opening and closing passage through the first balance beam to close or open the flow passage.

2. The plug valve according to claim 1, wherein: A first central connection ear is provided at the central position of the first balance beam along the length direction. First driving connection ears and second driving connection ears are respectively provided at both ends of the first balance beam along the length direction. The first driving connection ear and the second driving connection ear are symmetrically arranged with respect to the first central connection ear. The first central connection ear is hinged to the first valve plate, and the first driving connection ear and the second driving connection ear are respectively hinged to the first driving member and the second driving member.

3. The plug valve according to claim 1, characterized in that: Both the first driving member and the second driving member are hydraulic cylinders.

4. The plug valve according to claim 1, wherein: One end of the first driving member and the second driving member away from the first balance beam is fixedly connected or hinged.

5. The plug valve according to claim 1, characterized in that: The first valve component group further includes a first limiting member and a second limiting member. The first limiting member is disposed on the running path of the first driving member to limit the running stroke of the first driving member. The second limiting member is disposed on the running path of the second driving member to limit the running stroke of the second driving member.

6. The plug valve according to claim 5, characterized in that: At least one of the first limiting member and the second limiting member is a travel switch.

7. The plug valve according to claim 6, characterized in that: The plug valve further includes a control device, which is respectively connected to the travel switch, the first driving member, and the second driving member to control the operation of the first driving member and the second driving member through the received signal of the travel switch.

8. The plug valve according to claim 6, wherein: The travel switch includes one or a combination of a touch switch, a light sensor switch, and a magnetic sensor switch.

9. The plug valve according to any one of claims 1 to 8, characterized in that: Relative to the flow passage, the valve body further has a second opening and closing passage symmetrically arranged with the first opening and closing passage, and further includes a second valve component group cooperating with the second opening and closing passage; The second valve component group includes a second valve plate, a second driving device, and a second balance beam. The second valve plate is movably disposed in the second opening and closing passage. The second driving device includes a third driving member and a fourth driving member disposed on opposite sides of the second valve plate. The second balance beam is respectively hinged to the second valve plate, the third driving member, and the fourth driving member; The third driving member and the fourth driving member can drive the second valve plate to move along the second opening and closing passage through the second balance beam to cooperate with the first valve component group to close or open the flow passage.

10. The plug valve according to claim 9, wherein: One end of the third driving member and the fourth driving member away from the second crossbeam is fixedly connected or hinged; or one end of the third driving member away from the second crossbeam is hinged to one end of the first driving member away from the first crossbeam; or one end of the fourth driving member away from the second crossbeam is hinged to one end of the second driving member away from the first crossbeam.

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