Valve closing mechanism and stop valve based on same

Abstract

The invention relates to the technical field of stop valve machining, in particular to a valve closing mechanism and a stop valve based on the valve closing mechanism, the valve closing mechanism comprises a manual driving assembly, an automatic driving assembly and a power box, the manual driving assembly and the automatic driving assembly are used for driving a valve clack in a valve body to move, and the power box is used for containing a driving component; the manual driving assembly comprises a first transmission disc, the automatic driving assembly comprises a second transmission disc, a valve rod is further arranged in the valve body, a clutch assembly is further arranged between the manual driving assembly and the automatic driving assembly, the clutch assembly comprises a first clutch disc and a second clutch disc, and the clutch assembly can move between the manual driving assembly and the automatic driving assembly. The clutch assembly is installed in the valve, when the valve is automatically and rapidly opened, the clutch assembly is separated from the manual low-speed driving mechanism, the clutch assembly makes contact with the automatic rapid driving mechanism, in this way, a hand wheel in the manual low-speed driving mechanism cannot rotate, and then the safety of the valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stop valves, in particular to a valve closing mechanism and a stop valve based on the valve closing mechanism. Background Art

[0002] A stop valve is a valve that controls the flow of fluid and adjusts the flow rate by moving the valve core up and down or rotating it. Its opening and closing parts are plug-shaped valve discs with a flat or conical sealing surface. The valve disc moves linearly along the center line of the fluid. When the valve core moves downward, the gap between the valve core and the valve seat gradually decreases and eventually closes completely, thereby preventing the passage of the fluid; when the valve core moves upward, the gap gradually increases, allowing the fluid to pass. By adjusting the position of the valve core, precise control of the fluid flow rate can be achieved.

[0003] Chinese patent CN212004489U discloses an electric stop valve, including an electric stop valve body, a motor is arranged inside the electric stop valve body, a wire storage mechanism is arranged on the front end outer surface of the electric stop valve body, a regulating valve is arranged on one side of the motor, a rotatable regulating mechanism is arranged on the outer surface of one side of the regulating valve, the rotatable regulating mechanism includes an adjusting column, a seat, a semicircular hollow plate, a rotating shaft, a telescopic hollow column and a spring, a valve cylinder is arranged at the lower end of the motor, a valve seat is arranged on the lower end outer surface of the valve cylinder, and a water pipe is arranged at the lower end of the valve seat.

[0004] In the above structure, the valve stem is driven by a motor or a handwheel to move the valve core up and down. When the automatic opening and closing valve is used, the manual slow drive mechanism and the automatic fast drive mechanism are coupled to each other through gears. When the automatic fast drive mechanism is running, the handwheel in the manual drive mechanism will automatically rotate. When opening or closing the valve, if the staff is manually opening or closing the valve, the automatic fast drive component inside the valve suddenly starts, causing the handwheel of the manual drive component to rotate, such as pinching fingers and spraining arms, which poses a great safety hazard. Summary of the invention

[0005] The object of the present invention is to provide a valve closing mechanism and a stop valve based on the valve closing mechanism. By installing a clutch assembly in the valve, when the automatic fast opening of the valve is adopted, the clutch assembly is separated from the manual slow driving mechanism, and the clutch assembly is in contact with the automatic fast driving mechanism, so that the hand wheel in the manual slow driving mechanism will not rotate, thereby improving the safety of the valve.

[0006] In order to solve the problems of the prior art, the present invention provides a valve closing mechanism, comprising a manual drive component and an automatic drive component for driving the movement of a valve disc in a valve body, and a power box for accommodating the drive components, wherein the manual drive component comprises a first transmission disc, the automatic drive component comprises a second transmission disc, a valve stem is further provided in the valve body, a toothed disc is movably provided in the power box, the toothed disc is movably connected to one end of the valve stem through a thread, the other end of the valve stem is fixed to the valve disc in the valve body, and when the valve stem is driven to rotate by the manual drive component or the automatic drive component, the valve disc in the valve body The valve disc movement controls the on-and-off of the fluid. A clutch assembly is also arranged between the manual drive assembly and the automatic drive assembly. The clutch assembly includes a first clutch disc and a second clutch disc. The clutch assembly can move between the manual drive assembly and the automatic drive assembly. Initially, the first clutch disc is always in contact with the first transmission disc. When the valve needs to be manually started, the first clutch disc is in contact with the first transmission disc, and the power of manual opening is transmitted to the valve stem to move the valve disc. When the valve needs to be opened automatically, the second clutch disc moves to contact with the second transmission disc, and the power is transmitted to the valve stem to move the valve disc.

[0007] Preferably, a plurality of first protrusions are distributed on the first clutch plate, and a first groove cooperating with the first protrusions is opened in the first transmission plate. When the first clutch plate contacts the first transmission plate, the first protrusions are inserted into the first grooves, and the first clutch plate rotates to drive the first transmission plate to rotate.

[0008] Preferably, a plurality of second protrusions are distributed on the second clutch plate, and a second groove cooperating with the second protrusions is opened in the second transmission plate. When the second clutch plate contacts the second transmission plate, the second protrusions are inserted into the second grooves, and the second clutch plate rotates to drive the second transmission plate to rotate.

[0009] Preferably, the clutch assembly also includes a first sliding member and a second sliding member, and a linkage rod is fixed between the first sliding member and the second sliding member, and the linkage rod is used to enable the first sliding member and the second sliding member to move back and forth synchronously, and when the first sliding member moves, the first clutch disk contacts or separates from the first transmission disk, and when the second sliding member moves, the second clutch disk contacts or separates from the second transmission disk.

[0010] Preferably, the clutch assembly also includes a first fixed block and a second fixed block, the first fixed block is fixed to a position of the linkage rod close to the manual drive assembly, the second fixed block is fixed to an inner wall of the power box, a reset member is provided between the first fixed block and the second fixed block, one end of the reset member is fixedly connected to the first fixed block, and the other end of the reset member is fixedly connected to the second fixed block.

[0011] Preferably, the reset member is a spring, and a force is applied on the linkage rod to make the second clutch disc contact with the second transmission disc. The spring stores energy. When the force applied to the linkage rod disappears, the spring separates the second clutch disc from the second transmission disc, and the first clutch disc contacts with the first transmission disc.

[0012] Preferably, the clutch assembly also includes a slide rail, which is symmetrically arranged inside the power box and along the length direction of the power box. The slide rail is slidably matched with the first sliding member, and the slide rail is slidably connected with the second sliding member. The first clutch disk is rotatably arranged in the first sliding member, and the first clutch disk moves synchronously with the movement of the first sliding member. The second clutch disk is rotatably arranged in the second sliding member, and the second clutch disk moves synchronously with the movement of the second sliding member.

[0013] Preferably, a handle for moving the linkage rod is mounted on the linkage rod, and through slots are provided on the front and rear sides of the power box, and the handle passes through the through slots and extends to the outside of the power box.

[0014] Preferably, the manual drive assembly further includes a first transmission shaft, the first transmission shaft is provided with at least one first slide groove, the first clutch disc is sleeved on the first transmission shaft, and the first clutch disc is provided with a protrusion cooperating with the first slide groove.

[0015] The automatic drive assembly also includes a second transmission shaft, on which at least one second slide groove is provided, the second clutch disc is sleeved on the second transmission shaft, and the second clutch disc is internally provided with a protrusion that cooperates with the second slide groove.

[0016] A stop valve based on the valve closing mechanism comprises the valve closing mechanism described in the above scheme.

[0017] Compared with the prior art, the beneficial effects of the present invention are: the valve closing mechanism and the stop valve based on the valve closing mechanism have reasonable structures and have the following advantages:

[0018] By arranging a manual drive component and an automatic drive component on the valve, the manual drive component is used to manually open or close the valve, and the automatic drive component is used to automatically open or close the valve. When the valve is opened or closed automatically, the first clutch disc in the clutch component is separated from the first transmission disc, and the second clutch disc is in contact with the second transmission disc. Therefore, when the automatic drive component drives the gear disc to rotate, the handwheel in the manual drive component will not rotate, thereby avoiding injuries to the staff due to the rotation of the handwheel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The invention discloses a first stereoscopic structural diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0020] Figure 2 The invention discloses a front view structural diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0021] Figure 3 The invention discloses a right side structural schematic diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0022] Figure 4 The invention discloses a first three-dimensional internal structure diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0023] Figure 5 The invention discloses a valve closing mechanism and a second internal stereoscopic structure diagram of a stop valve based on the valve closing mechanism.

[0024] Figure 6 The invention discloses a first exploded structural diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0025] Figure 7 The invention discloses a second explosion structure schematic diagram of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0026] Figure 8 The invention discloses a third exploded stereoscopic structural diagram of a valve closing mechanism and the interior of a stop valve based on the valve closing mechanism.

[0027] Fig. 9 The invention discloses a schematic diagram of a top view of the internal structure of a valve closing mechanism and a stop valve based on the valve closing mechanism.

[0028] Fig.10 A valve closing mechanism and a stop valve based on the valve closing mechanism Figure 8 Enlarged structural diagram at A in the middle.

[0029] The numbers in the figure are: 1, valve body; 2, valve stem; 21, gear plate; 3, power box; 31, through groove; 4, manual drive assembly; 41, hand wheel; 42, first transmission shaft; 421, first slide groove; 43, first driving gear; 44, first transmission plate; 441, first groove; 5, automatic drive assembly; 51, rotary drive member; 52, second transmission shaft; 521, second slide groove; 53, second driving gear; 54, second transmission plate; 541, second groove; 6, clutch assembly; 61, handle; 62, linkage rod; 63, first fixed block; 64, second fixed block; 65, reset member; 66, first sliding member; 67, first clutch plate; 671, first protrusion; 68, second sliding member; 69, second clutch plate; 691, second protrusion; 610, slide rail. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] Reference Figure 1 - Fig.10 As shown, the present invention provides: a valve closing mechanism and a stop valve based on the valve closing mechanism, including a manual drive component 4 and an automatic drive component 5 for driving the movement of the valve disc in the valve body 1, and a power box 3 for accommodating the drive components. The power box 3 not only serves as a shell for accommodating the drive components, but also has waterproof and dustproof sealing properties to ensure stable operation even in harsh environments. The manual drive component 4 includes a first transmission disc 44, and the automatic drive component 5 includes a second transmission disc 54. The first transmission disc 44 and the second transmission disc 54 are both made of high-strength wear-resistant materials, and the surface is specially treated to increase the friction coefficient to ensure the stability and efficiency of power transmission. A valve stem 2 is also provided in the valve body 1, and a toothed disc 21 is movably provided in the power box 3. The toothed disc 21 is movably connected to one end of the valve stem 2 through a thread, and the other end of the valve stem 2 is fixed to the valve disc in the valve body 1. When the valve stem 2 is driven to rotate by the manual drive component 4 or the automatic drive component 5, the valve disc in the valve body 1 moves to control the flow of the fluid. A clutch component 6 is also provided between the manual drive component 4 and the automatic drive component 5. The design of the clutch component 6 fully considers the flexibility and reliability of operation. The first clutch disc 67 and the second clutch disc 69 achieve fast and smooth switching through a precise mechanical structure. The clutch assembly 6 includes the first clutch disc 67 and the second clutch disc 69. The clutch assembly 6 can move between the manual drive assembly 4 and the automatic drive assembly 5. Initially, the first clutch disc 67 is always in contact with the first transmission disc 44. When the valve needs to be manually started, the first clutch disc 67 is in contact with the first transmission disc 44, and the power of manual opening is transmitted to the valve stem 2 to move the valve disc. When the valve needs to be opened automatically, the second clutch disc 69 moves to contact with the second transmission disc 54, and the power is transmitted to the valve stem 2 to move the valve disc. When the valve needs to be manually controlled, the user drives the first transmission disc 44 to rotate by operating the manual drive assembly 4 (such as a handle or a knob). At this time, the first clutch disc 67 in the clutch assembly 6 is in close contact with the first transmission disc 44, and the rotational power is transmitted to the valve stem 2 through the toothed disc 21, thereby driving the valve disc to move and realize the on-off control of the fluid. When the valve needs to be automatically controlled (such as by electric, pneumatic or hydraulic means), the automatic drive assembly 5 is started to drive the second transmission disc 54 to rotate. The second clutch disc 69 in the clutch assembly 6 moves to contact with the second transmission disc 54 under the drive of the control system, and also transmits the rotational power to the valve stem 2 through the toothed disc 21 to realize the automatic movement of the valve disc.

[0032] In this embodiment, when the valve is opened or closed automatically, the first clutch disk 67 in the clutch assembly 6 is separated from the first transmission disk 44, and the second clutch disk 69 is in contact with the second transmission disk 54, so that when the automatic drive assembly 5 drives the gear disk 21 to rotate, the hand wheel 41 in the manual drive assembly 4 will not rotate, thereby avoiding the rotation of the hand wheel 41 and causing injuries to the staff.

[0033] The first clutch disc 67 is provided with a plurality of first protrusions 671, which are of regular shape, evenly distributed, and are precisely processed to ensure the accuracy of their size and position. The design of the first protrusions 671 not only enhances the meshing strength between the clutch discs, but also provides the necessary friction force, making the power transmission smoother and more reliable. The first transmission disk 44 is provided with a first groove 441 which cooperates with the first protrusion 671. When the first clutch disk 67 contacts the first transmission disk 44, the first protrusion 671 is inserted into the first groove 441. When the first clutch disk 67 rotates, the first transmission disk 44 is driven to rotate. The depth, width and shape of these grooves correspond to the first protrusion 671 to ensure that when the first clutch disk 67 contacts the first transmission disk 44, the first protrusion 671 can be accurately inserted into the first groove 441 to form a tight and stable fitting relationship. Due to the tight fit and sufficient friction between the first protrusion 671 and the first groove 441, the rotational power of the first clutch disk 67 is effectively transmitted to the first transmission disk 44, and then the valve stem 2 is driven to rotate through the transmission mechanism such as the toothed disk 21, so as to realize the movement of the valve disc and the on-off control of the fluid.

[0034] A plurality of second protrusions 691 are distributed on the second clutch disk 69, and a second groove 541 cooperating with the second protrusion 691 is opened in the second transmission disk 54. When the second clutch disk 69 contacts the second transmission disk 54, the second protrusion 691 is inserted into the second groove 541. The shape, depth and width of these grooves correspond to the second protrusion 691 to ensure that when the second clutch disk 69 contacts the second transmission disk 54, the second protrusion 691 can be accurately inserted into the second groove 541 to form a tight and stable connection. When the second clutch disk 69 rotates, it drives the second transmission disk 54 to rotate.

[0035] The clutch assembly 6 also includes a first sliding member 66 and a second sliding member 68, between which a linkage rod 62 is fixed, and the linkage rod 62 is used to enable the first sliding member 66 and the second sliding member 68 to move back and forth synchronously, and when the first sliding member 66 moves, the first clutch disc 67 is in contact with or separated from the first transmission disc 44, and when the second sliding member 68 moves, the second clutch disc 69 is in contact with or separated from the second transmission disc 54, and the linkage rod 62 is one of the core components in the clutch assembly 6, which spans between the first sliding member 66 and the second sliding member 68, and is closely connected to the first sliding member 66 and the second sliding member 68 by a fixing method (such as threaded connection, pin fixing or welding, etc.). The main function of the linkage rod 62 is to ensure that the first sliding member 66 and the second sliding member 68 can move back and forth synchronously, that is, when the linkage rod 62 moves under the action of an external driving force (such as electromagnetic force, hydraulic pressure or mechanical force), the two sliding members move synchronously through the transmission effect of the linkage rod 62, and the relative position relationship between the two remains unchanged.

[0036] The clutch assembly 6 also includes a first fixed block 63 and a second fixed block 64. The first fixed block 63 is fixed to the position of the linkage rod 62 close to the manual drive assembly 4. The second fixed block 64 is fixed to the inner wall of the power box 3. A reset member 65 is arranged between the first fixed block 63 and the second fixed block 64. One end of the reset member 65 is fixedly connected to the first fixed block 63, and the other end of the reset member 65 is fixedly connected to the second fixed block 64. The reset member 65 is usually made of a material with a reset function such as a spring or an elastic sheet, and can be deformed and store energy when subjected to an external force, and release energy and return to its original state when the external force disappears. In the clutch assembly 6, the main function of the reset member 65 is to provide a reset force, so that after the operating force is released, the linkage rod 62 and the sliding member can automatically return to the initial position or the preset position.

[0037] The reset member 65 is a spring, and a force is applied on the linkage rod 62 to make the second clutch disc 69 contact with the second transmission disc 54. The spring stores energy. When the force applied to the linkage rod 62 disappears, the spring separates the second clutch disc 69 from the second transmission disc 54, and the first clutch disc 67 contacts with the first transmission disc 44.

[0038] The clutch assembly 6 also includes a slide rail 610, which is symmetrically arranged inside the power box 3 and arranged along the length direction of the power box 3. The slide rail 610 is slidably matched with the first sliding member 66, and the slide rail 610 is slidably connected with the second sliding member 68. The first clutch disk 67 is rotatably arranged in the first sliding member 66, and the first clutch disk 67 moves synchronously with the movement of the first sliding member 66. The second clutch disk 69 is rotatably arranged in the second sliding member 68, and the second clutch disk 69 moves synchronously with the movement of the second sliding member 68. The slide rail 610 is symmetrically arranged inside the power box 3, which is to ensure that the clutch assembly 6 can maintain balance and stability during movement. The slide rail 610 is arranged along the length direction of the power box 3. The purpose of this design is to match the movement direction of the linkage rod 62 and the first sliding member 66 and the second sliding member 68, so that the movement of the entire clutch assembly 6 is smoother and more precise.

[0039] A handle 61 for moving the linkage rod 62 is installed on the linkage rod 62. Through slots 31 are provided on the front and rear sides of the power box 3. The handle 61 passes through the through slots 31 and extends to the outside of the power box 3. The user can directly control the movement of the linkage rod 62 by holding and rotating or pushing and pulling the handle 61, thereby driving the synchronous movement of the first sliding member 66 and the second sliding member 68. This design not only simplifies the operation process, but also improves the intuitiveness and convenience of the operation.

[0040] The manual drive assembly 4 also includes a first transmission shaft 42, on which at least one first slide groove 421 is provided, and a first clutch disc 67 is sleeved on the first transmission shaft 42, and a protrusion that cooperates with the first slide groove 421 is provided inside the first clutch disc 67; the manual drive assembly 4 also includes a hand wheel 41, one end of which is fixedly connected to the first transmission shaft 42, and the hand wheel 41 drives the first transmission shaft 42 to rotate and then drives the first clutch disc 67 to rotate, one end of the first transmission disc 44 is fixedly connected to the first driving gear 43 through an axis, and the first driving gear 43 is meshed with the toothed disc 21, and the first transmission shaft 42 is one of the core components in the manual drive assembly 4, which is responsible for transmitting the rotational motion from the hand wheel 41 to the first clutch disc 67, and finally driving the valve stem 2 to rotate. In order to ensure that the first clutch disc 67 can move smoothly along the first transmission shaft 42 and maintain a rotational connection at the same time.

[0041] The automatic drive assembly 5 also includes a second transmission shaft 52, and at least one second slide groove 521 is provided on the second transmission shaft 52. The second clutch disk 69 is sleeved on the second transmission shaft 52, and a protrusion that cooperates with the second slide groove 521 is provided inside the second clutch disk 69. The automatic drive assembly 5 also includes a rotary drive member 51, which is fixed to the outside of the power box 3. The output end of the rotary drive member 51 is fixedly connected to the second transmission shaft 52. The rotary drive member 51 drives the second transmission shaft 52 to rotate and then drives the second clutch disk 69 to rotate. A second driving gear 53 is fixed to one end of the second transmission disk 54 through an axis. The second driving gear 53 is meshed with the toothed disk 21. The second transmission shaft 52 is the core component of the automatic drive assembly 5, which is responsible for transmitting the rotational power from the rotary drive member 51 to the second clutch disk 69, and finally drives the valve stem 2 to rotate. Similar to the first transmission shaft 42, at least one second slide groove 521 is also provided on the second transmission shaft 52. These slide grooves provide sliding paths for the protrusions inside the second clutch disc 69 , so that the second clutch disc 69 can maintain a rotational connection with the second transmission shaft 52 when moving axially.

[0042] Working principle: When in use, the valve is installed in the pipeline, and the staff rotates the hand wheel 41 to rotate the first transmission shaft 42, and the first transmission shaft 42 rotates the first clutch disk 67, and the first clutch disk 67 rotates the first transmission disk 44, thereby driving the first driving gear 43 to rotate, and the first driving gear 43 rotates the toothed disk 21, and the toothed disk 21 moves the valve stem 2 to move the valve disc, opening or closing the valve. When it is necessary to switch to automatically open the valve, the staff pushes the handle 61 to move the linkage rod 62. In addition, for ease of operation, a linear motion The linkage rod 62 is automatically moved. After the linkage rod 62 moves, the first sliding member 66 and the second sliding member 68 are moved, so that the first clutch disk 67 is separated from the first transmission disk 44, and the second clutch disk 69 is in contact with the second transmission disk 54. When the rotary drive member 51 rotates, the rotary drive member 51 rotates the second transmission shaft 52, and then the second clutch disk 69 rotates, and the power is transmitted to the second transmission disk 54. The second driving gear 53 is driven to rotate through the second transmission disk 54, and then the toothed disk 21 is rotated, thereby realizing automatic opening or closing of the valve, and the valve safety is higher.

[0043] The above embodiments only express one or several implementation modes of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A valve closing mechanism, comprising a manual drive assembly (4) and an automatic drive assembly (5) for driving a valve flap in a valve body (1) to move, and a power box (3) for accommodating the drive components, characterized in that: The manual drive assembly (4) includes a first transmission disc (44), the automatic drive assembly (5) includes a second transmission disc (54), the valve body (1) is also provided with a valve stem (2), the power box (3) is movably provided with a toothed disc (21), the toothed disc (21) is movably connected to one end of the valve stem (2) via a thread, the other end of the valve stem (2) is fixed to the valve disc in the valve body (1), when the valve stem (2) is driven to rotate by the manual drive assembly (4) or the automatic drive assembly (5), the valve disc in the valve body (1) moves to control the on and off of the fluid, and the manual drive assembly (4) and the automatic drive assembly (5) are also connected. A clutch assembly (6) is provided, the clutch assembly (6) comprising a first clutch disc (67) and a second clutch disc (69), the clutch assembly (6) being capable of moving between a manual drive assembly (4) and an automatic drive assembly (5); initially, the first clutch disc (67) is always in contact with the first transmission disc (44); when the valve needs to be manually started, the first clutch disc (67) is in contact with the first transmission disc (44), transmitting the power of manual opening to the valve stem (2) to move the valve disc; when the valve needs to be opened automatically, the second clutch disc (69) moves to contact with the second transmission disc (54), transmitting the power to the valve stem (2) to move the valve disc.

2. A valve closing mechanism according to claim 1, characterized in that: A plurality of first protrusions (671) are distributed on the first clutch disk (67), and a first groove (441) cooperating with the first protrusions (671) is provided in the first transmission disk (44). When the first clutch disk (67) contacts the first transmission disk (44), the first protrusions (671) are inserted into the first grooves (441), and when the first clutch disk (67) rotates, the first transmission disk (44) is driven to rotate.

3. A valve closing mechanism according to claim 2, characterized in that: A plurality of second protrusions (691) are distributed on the second clutch disk (69), and a second groove (541) cooperating with the second protrusion (691) is provided in the second transmission disk (54). When the second clutch disk (69) contacts the second transmission disk (54), the second protrusion (691) is inserted into the second groove (541), and when the second clutch disk (69) rotates, the second transmission disk (54) is driven to rotate.

4. A valve closing mechanism according to claim 3, characterized in that: The clutch assembly (6) further comprises a first sliding member (66) and a second sliding member (68), wherein a linkage rod (62) is fixed between the first sliding member (66) and the second sliding member (68), wherein the linkage rod (62) is used to enable the first sliding member (66) and the second sliding member (68) to move back and forth synchronously, wherein when the first sliding member (66) moves, the first clutch disc (67) contacts or separates from the first transmission disc (44), and when the second sliding member (68) moves, the second clutch disc (69) contacts or separates from the second transmission disc (54).

5. A valve closing mechanism according to claim 4, characterized in that: The clutch assembly (6) further comprises a first fixed block (63) and a second fixed block (64); the first fixed block (63) is fixed to a position of the linkage rod (62) close to the manual drive assembly (4); the second fixed block (64) is fixed to an inner wall of the power box (3); a reset member (65) is arranged between the first fixed block (63) and the second fixed block (64); one end of the reset member (65) is fixedly connected to the first fixed block (63); and the other end of the reset member (65) is fixedly connected to the second fixed block (64).

6. A valve closing mechanism according to claim 5, characterized in that: The reset member (65) is a spring. The linkage rod (62) applies a force to make the second clutch disc (69) contact the second transmission disc (54). The spring stores energy. When the force applied to the linkage rod (62) disappears, the spring separates the second clutch disc (69) from the second transmission disc (54), and the first clutch disc (67) contacts the first transmission disc (44).

7. A valve closing mechanism according to claim 6, characterized in that: The clutch assembly (6) also includes a slide rail (610), which is symmetrically arranged inside the power box (3) and arranged along the length direction of the power box (3). The slide rail (610) is slidably matched with the first sliding member (66), and the slide rail (610) is slidably connected with the second sliding member (68). The first clutch disk (67) is rotatably arranged in the first sliding member (66), and the first clutch disk (67) moves synchronously with the movement of the first sliding member (66). The second clutch disk (69) is rotatably arranged in the second sliding member (68), and the second clutch disk (69) moves synchronously with the movement of the second sliding member (68).

8. A valve closing mechanism according to claim 7, characterized in that: The linkage rod (62) is provided with a handle (61) for moving the linkage rod (62); through slots (31) are provided at the front and rear sides of the power box (3); and the handle (61) passes through the through slots (31) and extends to the outside of the power box (3).

9. A valve closing mechanism according to claim 8, characterized in that: The manual drive assembly (4) further comprises a first transmission shaft (42), the first transmission shaft (42) further comprises at least one first slide groove (421), the first clutch disc (67) is sleeved on the first transmission shaft (42), and the first clutch disc (67) further comprises a protrusion inside thereof which cooperates with the first slide groove (421); The automatic drive assembly (5) further comprises a second transmission shaft (52), the second transmission shaft (52) is provided with at least one second slide groove (521), the second clutch disc (69) is sleeved on the second transmission shaft (52), and the second clutch disc (69) is provided with a protrusion that cooperates with the second slide groove (521) inside.

10. A stop valve based on the valve closing mechanism, characterized in that: A valve closing mechanism comprising any one of claims 1-9.

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