Actuator for smoke control valve

Abstract

The utility model provides an actuator for smoke preventing and exhausting valve, the main shaft passes through the installation base plate transversely, the axis of main shaft is located on the symmetry center line of installation base plate, and motor drive mechanism is located below main shaft transmission mechanism, motor drive mechanism can drive main shaft to rotate around the axis according to first direction through main shaft transmission mechanism, makes main shaft rotate to open position, and main shaft transmission mechanism is locked by prong lock sheet board, motor drive mechanism continues to rotate according to first direction, prong lock sheet board and main shaft transmission mechanism are unlocked, and third reset piece drives main shaft to rotate around the axis according to second direction, makes main shaft rotate to close position. Through symmetry formula design, through many reset piece combination, mechanical and electrical limit combination, automatic locking and fuse protection mechanism, have realized high adaptability, high reliability and high security, its structure simplifies, has reduced production cost and maintenance difficulty, is applicable to the smoke preventing and exhausting valve of multiple specifications, has met the dual demand of building ventilation industry to actuator performance and economy.

Description

Technical Field

[0001] This utility model relates to an actuator for a smoke exhaust valve. Background Technology

[0002] Actuators for smoke exhaust valves are important safety devices, primarily used to control the opening and closing of the valve's blades to prevent the spread of smoke. Different specifications of valve products require different specifications of smoke exhaust valve actuators. With the development of the building ventilation industry, competition among products is increasingly fierce. Besides quality, price has become a key factor. Simultaneously producing and selling actuators for different specifications of smoke exhaust valves would significantly increase production, packaging, and transportation costs, making the product uncompetitive in terms of price. Therefore, our company has developed a symmetrical and stable actuator that can be adapted to various specified smoke exhaust valves, thus expanding the actuator's applicability. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of existing smoke exhaust valves with diverse specifications and low actuator adaptability, and to provide an actuator for smoke exhaust valves.

[0004] This utility model solves the above-mentioned technical problems through the following technical solutions:

[0005] This utility model provides an actuator for a smoke exhaust valve, including a mounting base, a main shaft, a main shaft transmission mechanism, a motor drive mechanism, a shift fork locking plate, and a third reset component. The mounting base is fixed to the outside of the smoke exhaust valve, and the extension direction of the mounting base is perpendicular to the rotation axis of the smoke exhaust valve. The mounting base has a vertically arranged symmetrical center line. The main shaft passes laterally through the mounting base, and the end of the main shaft facing the smoke exhaust valve is coaxially connected to the rotation axis of the smoke exhaust valve. The axis of the main shaft is located on the symmetrical center line of the mounting base. The main shaft transmission mechanism is sleeved on the main shaft and is circumferentially connected to the main shaft. The motor drive mechanism is mounted on the mounting base and is drively connected to the main shaft transmission mechanism. The motor drive mechanism is located below the main shaft transmission mechanism. The two ends of the shift fork locking plate are respectively fixed... The rotating shaft has a fixed end and a movable end. The fixed end of the shift fork locking plate is pivotally connected to the mounting base plate. The shift fork locking plate is disposed on the side of the main shaft transmission mechanism and the motor drive mechanism. The third reset member is sleeved on the main shaft. The two ends of the third reset member are respectively fixed to the outer peripheral surface of the main shaft and the mounting base plate. The third reset member always applies a force to the main shaft in the second direction. The motor drive mechanism can drive the main shaft to rotate around the axis in the first direction through the main shaft transmission mechanism, so that the main shaft rotates to the open position, and the main shaft transmission mechanism is locked by the shift fork locking plate. When the motor drive mechanism continues to rotate in the first direction, the shift fork locking plate is unlocked from the main shaft transmission mechanism, and the third reset member drives the main shaft to rotate around the axis in the second direction, so that the main shaft rotates to the closed position. The rotation directions of the first direction and the second direction are opposite.

[0006] In this technical solution, a symmetrical design is adopted, with the center line of the mounting base coinciding with the axis of the main shaft, which makes the actuator structurally symmetrical, adaptable to smoke exhaust valves of different specifications, and improves versatility and installation flexibility.

[0007] Preferably, the motor drive mechanism is provided with a transmission pin; the main shaft transmission mechanism includes a first connecting rod, a second connecting rod, a first reset member, and a second reset member. One end of the first connecting rod is fixedly sleeved on the main shaft; the end of the first connecting rod away from the main shaft is hinged to the second connecting rod, and the end of the second connecting rod away from the hinge point can abut against the transmission pin. The transmission pin is arranged on the path of the second connecting rod rotating in the first direction; the first reset member is connected to the second connecting rod and the main shaft, and the first reset member always applies a force to the second connecting rod to rotate in the first direction; the second reset member is connected to the second connecting rod, and the second reset member always applies a force to the second connecting rod to rotate in the second direction; when the motor drive mechanism rotates, the transmission pin drives the main shaft to rotate in the first direction through the second connecting rod and the first connecting rod; when the main shaft rotates to the open position, the transmission pin disengages from the second connecting rod.

[0008] In this technical solution, the main shaft transmission mechanism adopts a combination of connecting rods and reset components, realizing power transmission and automatic position reset. Through the combined use of the first and second reset components, the second connecting rod achieves bidirectional reset during rotation, enabling it to quickly return to its initial position when no external force is applied, ensuring rapid actuator response and accurate operation. This reset mechanism reduces the failure rate and improves the safety performance of the actuator.

[0009] Preferably, the main shaft transmission mechanism further includes a positioning plate, which is fixedly sleeved on the main shaft, and the edge of the positioning plate is provided with a limiting groove; the actuator for the smoke exhaust valve further includes a first limiting mechanism, which is disposed in the circumference of the positioning plate; when the main shaft rotates to the open position, the first limiting mechanism is locked in the limiting groove.

[0010] In this technical solution, the positioning plate and the first limiting mechanism are used to limit the spindle in the open position during the spindle rotation process, so that the spindle can be positioned in the preset open position.

[0011] Preferably, the first limiting mechanism includes a rotating rod and a third micro switch. One end of the rotating rod is pivotally connected to the mounting base plate, and the other end of the rotating rod is provided with a first limiting shaft. The third micro switch is provided with a spring piece that contacts the end of the rotating rod. The spring piece and the first limiting shaft are located at the same end of the rotating rod. When the main shaft rotates to the open position, the spring piece pops out, causing the first limiting shaft to be locked in the limiting groove. The third micro switch sends a signal to the motor drive mechanism, and the motor drive mechanism stops rotating.

[0012] In this technical solution, when the spindle rotates to the open position, the spring pops out, the rotating rod rotates, the first limit shaft moves and gets stuck in the limit groove, and the third micro switch sends a signal to the motor drive mechanism, the motor drive mechanism stops rotating, and the spindle is positioned in the open position.

[0013] Preferably, the main shaft transmission mechanism further includes a positioning plate, which is coaxially sleeved on the main shaft, and the edge of the positioning plate is provided with a limiting protrusion; the actuator for the smoke exhaust valve further includes a second limiting shaft, which is fixed on the mounting base plate, and is arranged around the circumference of the positioning plate. The second limiting shaft is located on the path of the limiting protrusion rotating in a second direction; when the main shaft rotates to the closed position, the second limiting shaft abuts against the limiting protrusion.

[0014] In this technical solution, the setting of the second limiting axis ensures that no displacement occurs when the main shaft is in the closed position.

[0015] Preferably, the motor drive mechanism includes a motor, a motor gear, and a drive gear. The main body of the motor is fixed to the mounting base plate. The motor gear is coaxially fixed to the rotating shaft of the motor. The rotating shaft of the drive gear is fixed to the mounting base plate. The drive gear can rotate around its own axis. The drive gear meshes with the motor gear. A transmission pin is provided on the end face of the drive gear. The transmission pin abuts against the main shaft transmission mechanism. When the motor drives the drive gear to rotate through the motor gear, the transmission pin pulls the main shaft transmission mechanism to rotate, causing the main shaft to rotate around the first direction.

[0016] In this technical solution, the motor drive mechanism adopts gear transmission, which provides a stable transmission ratio and efficient torque transmission. The cooperation between the transmission pin and the main shaft transmission mechanism realizes motion conversion and simplifies the transmission chain.

[0017] Preferably, the motor drive mechanism further includes a limiting boss and a first micro switch. The limiting boss is formed on the end face of the power gear facing the mounting base plate, and a first positioning groove is provided in the circumferential direction of the limiting boss. The first micro switch is disposed in the circumferential direction of the limiting boss and is electrically connected to the main motor. When the main shaft rotates to the open position, the control piece of the first micro switch contacts the first positioning groove, the first micro switch is disconnected, and the motor stops rotating.

[0018] In this technical solution, the cooperation between the first micro switch and the limit boss enables the motor to automatically stop when the spindle rotates to the open position, avoiding over-rotation or under-rotation and improving control accuracy. This combination of electrical and mechanical limit switches provides double protection for the accuracy of the actuator position and reduces the risk of misoperation.

[0019] Preferably, the motor drive mechanism further includes a limiting boss and a second micro switch. The limiting boss is formed on the end face of the power gear facing the mounting base plate, and a second positioning groove is provided in the circumferential direction of the limiting boss. The second micro switch is disposed in the circumferential direction of the limiting boss and is electrically connected to the main motor. When the main shaft rotates to the closed position, the control piece of the second micro switch contacts the second positioning groove, the second micro switch is disconnected, and the motor stops rotating.

[0020] In this technical solution, the cooperation between the second micro switch and the limit boss enables the motor to automatically stop when the spindle rotates to the closed position, avoiding over-rotation or under-rotation and improving control accuracy. This combination of electrical and mechanical limit switches provides double protection for the accuracy of the actuator position and reduces the risk of misoperation.

[0021] Preferably, the actuator for the smoke exhaust valve further includes a fourth reset member, which is connected to the movable end of the shift fork locking plate. The fourth reset member always applies a force to the shift fork locking plate that moves towards the main shaft transmission mechanism and the motor drive mechanism. The area of ​​the shift fork locking plate facing the main shaft transmission mechanism is provided with a first locking member, and the main shaft transmission mechanism is provided with a second locking member. The area of ​​the shift fork locking plate facing the motor drive mechanism is provided with a first unlocking member, and the motor drive mechanism is provided with a second unlocking member. When the main shaft rotates to the open position, the first locking member and the second locking member cooperate, and the first unlocking member and the second unlocking member cooperate.

[0022] In this technical solution, when the spindle is in the open position, the first and second locking components serve as auxiliary positioning elements to prevent the valve from accidentally closing due to vibration or external force. When the spindle needs to rotate to the closed position, the cooperation of the first and second unlocking components unlocks the spindle, allowing it to automatically return to the closed position. This locking and unlocking structure is simple, reliable, requires no additional power, and improves the safety and stability of the actuator.

[0023] Preferably, the spindle transmission mechanism includes a positioning plate, which is coaxially fixed on the spindle; the second locking member is a locking groove disposed on the edge of the positioning plate; the first locking member is a locking bearing fixed on the shift fork locking plate; when the spindle rotates to the open position, the locking bearing is engaged in the locking groove.

[0024] In this technical solution, when the spindle rotates to the open position, the locking bearing is engaged in the locking groove, which keeps the positioning plate and the power gear in the open position, thereby keeping the spindle in the open position.

[0025] Preferably, the motor drive mechanism further includes a drive gear, the rotation shaft of which is fixed on the mounting base plate, and the drive gear can rotate around its own axis. When the drive gear rotates, it drives the main shaft transmission mechanism to move. The second unlocking component is an unlocking bearing, which is fixed on the end face of the drive gear. The first unlocking component is an unlocking protrusion provided on the edge of the shift fork locking plate. When the main shaft rotates to the open position, the unlocking protrusion fits against the unlocking bearing.

[0026] In this technical solution, when the spindle needs to be rotated to the closed position, the power gear continues to rotate in the first direction, the unlocking bearing pushes the unlocking protrusion, causing the shift fork locking plate to rotate away from the positioning plate and the power gear, so that the first locking member disengages from the second locking member, and the spindle can quickly rotate to the closed position in the second direction under the action of the third reset member.

[0027] Preferably, the actuator for the smoke exhaust valve further includes a fusible tube and a fusible tube transmission mechanism. The fusible tube is disposed on the side of the mounting base facing the smoke exhaust valve, with the fusible end of the fusible tube facing the smoke exhaust valve, and the limiting end of the fusible tube passing through the mounting base. The fusible tube transmission mechanism is connected to the main shaft transmission mechanism, and the fusible tube transmission mechanism is limited by the limiting end of the fusible tube. After the fusible tube melts, the limiting end of the fusible tube disengages from the fusible tube transmission mechanism, and the fusible tube transmission mechanism drives the shift fork locking plate away from the main shaft transmission mechanism and the motor drive mechanism, and the main shaft resets to the closed position.

[0028] In this technical solution, the fuse is a key safety function of the actuator. In the event of a fire, the fuse melts, triggering the main shaft drive mechanism to release the shift fork locking plate, causing the main shaft to automatically return to the closed position, cutting off airflow and preventing the spread of fire. This design complies with fire protection regulations, achieves passive safety protection, requires no electrical or manual intervention, and has high reliability.

[0029] Preferably, the fuse tube transmission mechanism includes a fuse tube fork and a fifth reset member. The fuse tube fork is pivotally connected to the mounting base plate. The edges of the fuse tube fork form a first limiting angle and a second limiting angle. The first limiting angle can contact the limiting end of the fuse tube, and the second limiting angle can contact the edge of the fork locking plate. The fifth reset member always applies a force to the fuse tube fork, causing the first limiting angle to abut against the limiting end of the fuse tube. After the fuse tube melts, the limiting end of the fuse tube disengages from the first limiting angle, and the fuse tube fork rotates, causing the second limiting angle to push the fork locking plate away from the main shaft transmission mechanism and the motor drive mechanism, and the main shaft resets to the closed position.

[0030] In this technical solution, when the fuse tube melts, the limiting end of the fuse tube disengages from the first limiting angle; under the action of the fifth reset component, the fuse tube fork rotates, causing the second limiting angle to push the fork locking plate away from the main shaft transmission mechanism and the motor drive mechanism, and the main shaft can be reset to the closed position.

[0031] Preferably, the actuator for the smoke exhaust valve further includes a mounting plate, which is fixedly connected to the edge of the mounting base plate. The mounting plate extends toward the smoke exhaust valve and is fixed to the smoke exhaust valve. The mounting plate forms a first mounting space around the mounting base plate. The components of the main shaft, the main shaft transmission mechanism, and the motor drive mechanism located on the side of the mounting base plate facing the smoke exhaust valve are located within the first mounting space.

[0032] In this technical solution, the mounting support plate and mounting base plate form the first mounting space, which rationally arranges the internal components of the actuator, improving the structural compactness and protection level of the actuator.

[0033] Preferably, the actuator for the smoke exhaust valve further includes a protective cover, which is fixedly placed on the side of the mounting base away from the smoke exhaust valve. A second mounting space is formed between the protective cover and the mounting base. The components of the main shaft, the main shaft transmission mechanism, and the motor drive mechanism located on the side of the mounting base facing the protective cover are located within the second mounting space.

[0034] In this technical solution, the protective cover and mounting base plate form a second mounting space, which rationally arranges the internal components of the actuator, improving the structural compactness and protection level of the actuator.

[0035] Preferably, the end of the main shaft away from the smoke exhaust valve extends outside the protective cover; the actuator for the smoke exhaust valve also includes a handle, which is fixedly sleeved on the end of the main shaft extending outside the protective cover, and the handle can drive the main shaft to rotate around the axis.

[0036] In this technical solution, the handle is designed to facilitate manual operation, allowing for quick manual rotation of the spindle in emergency situations or during maintenance, thus switching between open and closed positions and enhancing the practicality and flexibility of the actuator.

[0037] Based on common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain various preferred embodiments of this utility model.

[0038] The positive and progressive effects of this utility model are as follows:

[0039] The aforementioned actuator for smoke exhaust valves, through its symmetrical design, multi-reset component combination, mechanical and electrical limit combination, automatic locking and fusible protection mechanism, achieves high adaptability, high reliability and high safety; its simplified structure reduces production costs and maintenance difficulty, and it is suitable for various specifications of smoke exhaust valves, meeting the dual requirements of the building ventilation industry for actuator performance and economy. Attached Figure Description

[0040] Figure 1 This is a front view of the actuator for the smoke exhaust valve of this utility model.

[0041] Figure 2 for Figure 1 The image shows a top view of the actuator for the smoke exhaust valve.

[0042] Figure 3 for Figure 1 The right view of the actuator for the smoke exhaust valve shown.

[0043] Figure 4 for Figure 1 The diagram shows the internal structure of the actuator for the smoke exhaust valve.

[0044] Figure 5 for Figure 4 The illustrated cross-sectional view of the actuator for the smoke exhaust valve along the center line of symmetry of the mounting base plate.

[0045] Figure 6 for Figure 4 The image shows a cross-sectional view of the actuator for the smoke exhaust valve.

[0046] Figure 7 for Figure 4 The diagram shows the combined installation of the spindle drive mechanism and the spindle of the actuator for the smoke exhaust valve.

[0047] Figure 8 for Figure 7 The cross-sectional view shown is of the combination of the spindle drive mechanism and the spindle.

[0048] Figure 9 for Figure 7 The diagram shows the installation schematic of the connecting rod structure of the spindle drive mechanism.

[0049] Figure 10 for Figure 9 A schematic diagram of the linkage structure is shown.

[0050] Figure 11 for Figure 4 The diagram shows the structure of the fuse tube of the actuator for the smoke exhaust valve.

[0051] Figure 12 for Figure 4The diagram shows the structure of the actuator for the smoke exhaust valve in the closed state.

[0052] Figure 13 for Figure 4 The diagram shows the structure of the actuator for the smoke exhaust valve in the open state.

[0053] Figure 14 for Figure 4 The diagram shows the structure of the actuator for the smoke exhaust valve in the state of the fusible link being fused.

[0054] Explanation of reference numerals in the attached figures

[0055] Mounting base plate 1

[0056] Symmetry centerline 11

[0057] Spindle 2

[0058] Main shaft transmission mechanism 3

[0059] First link 31

[0060] Second link 32

[0061] First reset component 33

[0062] Second reset component 34

[0063] Positioning plate 35

[0064] Limiting groove 36

[0065] Limiting protrusion 37

[0066] Third reset component 38

[0067] Second locking element 39

[0068] Motor drive mechanism 4

[0069] Transmission pin 41

[0070] Motor 42

[0071] Motor Gear 43

[0072] Power Gear 44

[0073] Limiting boss 45

[0074] First positioning groove 46

[0075] First micro switch 47

[0076] Second positioning groove 48

[0077] Second micro switch 49

[0078] Second unlocking component 410

[0079] First limiting mechanism 5

[0080] Rotating rod 51

[0081] Third micro switch 52

[0082] First limiting axis 53

[0083] Shrapnel 54

[0084] Second limiting axis 6

[0085] Shift fork locking plate 7

[0086] Fixed end 71

[0087] Activity Terminal 72

[0088] First locking component 73

[0089] First unlocking component 74

[0090] Fourth reset component 8

[0091] Fuse tube 9

[0092] Fuse end 91

[0093] Limit end 92

[0094] 10 Fuse tube drive mechanism

[0095] 101 fuse tube fork

[0096] Fifth reset component 102

[0097] First limiting angle 103

[0098] Second limiting angle 104

[0099] Install support plate 20

[0100] First installation space 30

[0101] Protective cover 40

[0102] Second installation space 50

[0103] Handle 60

[0104] 70 indexing plate Detailed Implementation

[0105] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0106] like Figures 1 to 13As shown, the actuator for the smoke exhaust valve of this utility model includes a mounting base plate 1, a main shaft 2, a main shaft transmission mechanism 3, a motor drive mechanism 4, a shift fork locking plate 7, and a third reset component 38. The mounting base plate 1 is fixed to the outside of the smoke exhaust valve, and the extension direction of the mounting base plate 1 is perpendicular to the rotation axis of the smoke exhaust valve. The mounting base plate 1 is provided with a vertically arranged symmetrical center line 11. The main shaft 2 passes laterally through the mounting base plate 1, and the end of the main shaft 2 facing the smoke exhaust valve is coaxially connected to the rotation axis of the smoke exhaust valve. The axis of the main shaft 2 is located on the symmetrical center line 11 of the mounting base plate 1. The main shaft transmission mechanism 3 is sleeved on the main shaft 2, and the main shaft transmission mechanism 3 and the main shaft 2 are connected. The circumferential connection is as follows: The motor drive mechanism 4 is mounted on the mounting base plate 1 and is connected to the main spindle transmission mechanism 3. The motor drive mechanism 4 is located below the main spindle transmission mechanism 3. The two ends of the shift fork locking plate 7 are a fixed end 71 and a movable end 72, respectively. The fixed end 71 of the shift fork locking plate 7 is pivotally connected to the mounting base plate 1. The shift fork locking plate 7 is located on the side of the main spindle transmission mechanism 3 and the motor drive mechanism 4. The third reset member 38 is sleeved on the main spindle 2. The two ends of the third reset member 38 are fixed to the outer circumferential surface of the main spindle 2 and the mounting base plate 1, respectively. The third reset member 38 always applies a force to the main spindle 2 to rotate in the second direction.

[0107] The motor drive mechanism 4 drives the main shaft 2 to rotate around its axis in a first direction via the main shaft transmission mechanism 3. When the main shaft 2 rotates to the open position, the main shaft transmission mechanism 3 is locked by the shift fork locking plate 7. The rotating shaft of the smoke exhaust valve drives the blades to open, keeping the channels on both sides of the smoke exhaust valve connected. The motor drive mechanism 4 continues to rotate in the first direction, the shift fork locking plate 7 unlocks from the main shaft transmission mechanism 3, and the third reset member 38 drives the main shaft 2 to rotate around its axis in a second direction, causing the main shaft 2 to rotate to the closed position. The blades of the smoke exhaust valve are then closed, isolating the channels on both sides of the smoke exhaust valve. The first and second directions of rotation are opposite. In this embodiment, the first direction is clockwise, and the second direction is counterclockwise.

[0108] The actuator of this smoke exhaust valve adopts a symmetrical design, with the center line 11 of the mounting base plate 1 coinciding with the axis of the main shaft 2, which makes the actuator structurally symmetrical and can be adapted to smoke exhaust valves of different specifications, thus improving its versatility and installation flexibility.

[0109] like Figure 4 , Figures 7 to 10As shown, the motor drive mechanism 4 is equipped with a transmission pin 41; the main shaft transmission mechanism 3 includes a first connecting rod 31, a second connecting rod 32, a first reset member 33, and a second reset member 34. One end of the first connecting rod 31 is fixedly sleeved on the main shaft 2; the end of the first connecting rod 31 away from the main shaft 2 is hinged to the second connecting rod 32, and the end of the second connecting rod 32 away from the hinge point can abut against the transmission pin 41. The transmission pin 41 is arranged on the path of the second connecting rod 32 rotating in the first direction; the first reset member 33 and the second reset member 34... The connecting rod 32 and the main shaft 2 are connected. The first reset member 33 always applies a force to the second connecting rod 32 in the first direction. The second reset member 34 is connected to the second connecting rod 32 and always applies a force to the second connecting rod 32 in the second direction. When the motor drive mechanism 4 rotates, the transmission pin 41 drives the main shaft 2 to rotate clockwise through the second connecting rod 32 and the first connecting rod 31. When the main shaft 2 rotates to the open position, the transmission pin 41 disengages from the second connecting rod 32.

[0110] The main shaft transmission mechanism 3 employs a combination of connecting rods and reset components to achieve power transmission and automatic position reset. The second connecting rod 32 rotates under the drive of the transmission pin 41 of the motor drive mechanism 4. During the rotation of the second connecting rod 32, it drives the first connecting rod 31 and the main shaft 2 to rotate. The first reset component 33 and the second reset component 34 apply forces to the second connecting rod 32 from the first and second directions respectively, ensuring smooth rotation of the second connecting rod 32 and automatic reset when no external force is applied. When the main shaft 2 rotates to the open position, the transmission pin 41 disengages from the second connecting rod 32, ensuring that the main shaft 2 automatically disengages from the motor drive mechanism 4 in the open position, avoiding overload issues.

[0111] like Figure 7 , Figure 9 As shown, the first reset element 33 is a torsion spring, which is sleeved on the hinge shaft of the second connecting rod 32. One end of the first reset element 33 abuts against the main shaft 2, and the other end of the first reset element 33 is fixed to the second connecting rod 32. The first reset element 33 always applies a force (i.e., a force rotating clockwise) towards the main shaft 2 to the second connecting rod 32, making it easier for the second connecting rod 32 to hook the transmission pin 41 when rotating, thereby driving the main shaft 2 to rotate.

[0112] like Figure 4 As shown, the second reset member 34 is a tension spring. One end of the second reset member 34 is fixed relative to the mounting base plate 1, and the other end is fixed to the second connecting rod 32. The second reset member 34 always applies a force to the second connecting rod 32 in a direction away from the main shaft 2, that is, a force for rotation in the counterclockwise direction. When the main shaft 2 rotates to the open position and is locked by the shift fork locking plate 7, the second reset member 34 applies a pulling force, causing the second connecting rod 32 to separate from the transmission pin 41 in a timely manner.

[0113] By combining torsion springs and tension springs, the second linkage 32 achieves a bidirectional reset function during rotation. The first reset element 33 (torsion spring) provides a reset force in the first direction (clockwise), and the second reset element 34 (tension spring) provides a reset force in the second direction (counterclockwise). This makes it easier for the second linkage 32 to hook the transmission pin 41 during the opening process, and ensures that the second linkage 32 can promptly disengage from the transmission pin 41 when the main shaft 2 reaches the open position, guaranteeing rapid response and accurate action of the actuator. This reset mechanism reduces the failure rate and improves the safety performance of the actuator.

[0114] like Figure 4 , Figure 7 As shown, the spindle drive mechanism 3 also includes a positioning plate 35, which is fixedly sleeved on the spindle 2. The positioning plate 35 is used to limit the spindle 2 in the open and closed positions during rotation, so that the spindle 2 can be positioned in the preset open and closed positions.

[0115] Specifically, for the open position, the edge of the positioning plate 35 is provided with a limiting groove 36. The actuator for the smoke exhaust valve also includes a first limiting mechanism 5, which is disposed in the circumference of the positioning plate 35; when the main shaft 2 rotates to the open position, the first limiting mechanism 5 is engaged in the limiting groove 36.

[0116] The first limiting mechanism 5 includes a rotating rod 51 and a third micro switch 52. One end of the rotating rod 51 is pivotally connected to the mounting base plate 1, and the other end of the rotating rod 51 is provided with a first limiting shaft 53. The third micro switch 52 is provided with a spring piece 54 that contacts the end of the rotating rod 51. The spring piece 54 and the first limiting shaft 53 are located at the same end of the rotating rod 51. The third micro switch 52 is electrically connected to the motor drive mechanism 4.

[0117] When the spindle 2 is in a position other than the open position, the first limiting shaft 53 abuts against the edge of the positioning plate 35, and the spring 54 is compressed towards the third micro switch 52. When the spindle 2 rotates to the open position, the spring 54 pops out, the rotating rod 51 rotates, the first limiting shaft 53 moves and gets stuck in the limiting groove 36, and the third micro switch 52 sends a signal to the motor drive mechanism 4, which stops rotating, thus positioning the spindle 2 in the open position.

[0118] For the closed position, the edge of the positioning plate 35 is provided with a limiting protrusion 37; the actuator for the smoke exhaust valve also includes a second limiting shaft 6, which is fixed on the mounting base plate 1 and arranged circumferentially around the positioning plate 35. The second limiting shaft 6 is positioned on the path of the limiting protrusion 37 rotating in the second direction. When the main shaft 2 rotates to the closed position, the second limiting shaft 6 abuts against the limiting protrusion 37. The setting of the second limiting shaft 6 ensures that the main shaft 2 will not be displaced when it is in the closed position.

[0119] like Figure 5 As shown, the third reset component 38 is a torsion spring. One end of the torsion spring is fixed to the outer circumferential surface of the main shaft 2, and the other end of the torsion spring is fixed to the mounting base plate 1. The third reset component 38 enables the main shaft 2 to automatically return to the closed position without external force, which meets the safety requirements of the smoke exhaust valve. In the event of a power failure or malfunction, the main shaft 2 can be automatically closed by manually moving the shift fork locking plate 7 under the action of the third reset component 38, preventing the spread of fire and improving the safety redundancy of the system.

[0120] like Figures 4 to 6 As shown, the motor drive mechanism 4 includes a motor 42, a motor gear 43, and a power gear 44. The main body of the motor 42 is fixed to the mounting base plate 1. The motor gear 43 is coaxially fixed to the rotating shaft of the motor 42. The rotating shaft of the power gear 44 is fixed on the mounting base plate 1. The power gear 44 can rotate around its own axis. The power gear 44 meshes with the motor gear 43. A transmission pin 41 is provided on the end face of the power gear 44. The transmission pin 41 abuts against the main shaft transmission mechanism 3. When the motor 42 drives the power gear 44 to rotate through the motor gear 43, the transmission pin 41 pulls the main shaft transmission mechanism 3 to rotate, causing the main shaft 2 to rotate around the first direction.

[0121] like Figure 12 As shown, specifically, when the motor 42 drives the power gear 44 to rotate through the motor gear 43, the transmission pin 41 on the power gear 44 rotates together. Under the combined action of the transmission pin 41 and the first reset member 33, the second connecting rod 32 is pulled to rotate downward clockwise, thereby driving the first connecting rod 31 and the main shaft 2 to rotate clockwise until the main shaft 2 reaches the open position.

[0122] The motor drive mechanism 4 adopts gear transmission, which has a stable transmission ratio and efficient torque transmission. The cooperation between the transmission pin 41 and the main shaft transmission mechanism 3 realizes the conversion of motion and simplifies the transmission chain. Moreover, when the main shaft 2 is in the open position, the transmission pin 41 disengages from the main shaft transmission mechanism 3, ensuring that the main shaft 2 can automatically disengage from the motor drive mechanism 4 when in the open position, avoiding overload problems.

[0123] like Figures 4 to 6As shown, the motor drive mechanism 4 also includes a limiting boss 45, which is formed on the end face of the power gear 44 facing the mounting base plate 1. The limiting boss 45 is used to limit the power gear 44 in the open and closed positions during rotation, so that the power gear 44 can stop at a preset position.

[0124] Specifically, for the open position, the limiting boss 45 is provided with a first positioning groove 46 in the circumference. The motor drive mechanism 4 also includes a first micro switch 47, which is disposed in the circumference of the limiting boss 45 and is electrically connected to the main motor 42. When the main shaft 2 rotates to the open position, the control piece of the first micro switch 47 contacts the first positioning groove 46, the first micro switch 47 is disconnected, and the motor 42 stops rotating.

[0125] For the closed position, the limiting boss 45 is provided with a second positioning groove 48 in the circumferential direction. The motor drive mechanism 4 also includes a second micro switch 49, which is disposed in the circumferential direction of the limiting boss 45 and is electrically connected to the main motor 42. When the main shaft 2 rotates to the closed position, the control piece of the second micro switch 49 contacts the second positioning groove 48, the second micro switch 49 is disconnected, and the motor 42 stops rotating.

[0126] The cooperation of the first micro switch 47, the second micro switch 49, and the limit boss 45 enables the automatic stop function of the motor, avoiding over-rotation or under-rotation and improving control accuracy. This combination of electrical and mechanical limit switches provides double protection for the accuracy of the actuator position and reduces the risk of misoperation.

[0127] like Figure 4 As shown, the actuator for the smoke exhaust valve also includes a fourth reset member 8, which is connected to the movable end 72 of the shift fork locking plate 7. The fourth reset member 8 always applies a force to the shift fork locking plate 7, moving it closer to the main shaft transmission mechanism 3 and the motor drive mechanism 4. In this embodiment, the fourth reset member 8 is a tension spring.

[0128] The fourth reset component 8 ensures that the shift fork locking plate 7 is always close to the main shaft transmission mechanism 3 and the motor drive mechanism 4. When the main shaft 2 is in the open position, the shift fork locking plate 7 acts as a lock, locking the main shaft transmission mechanism 3. When the main shaft 2 needs to be rotated to the closed position, the shift fork locking plate 7 can unlock from the main shaft transmission mechanism 3, allowing the main shaft transmission mechanism 3 and the main shaft 2 to be smoothly reset to the closed position.

[0129] Specifically, the area of ​​the shift fork locking plate 7 facing the main shaft transmission mechanism 3 is provided with a first locking member 73, and the main shaft transmission mechanism 3 is provided with a second locking member 39; the area of ​​the shift fork locking plate 7 facing the motor drive mechanism 4 is provided with a first unlocking member 74, and the motor drive mechanism 4 is provided with a second unlocking member 410; when the main shaft 2 rotates to the open position, the first locking member 73 cooperates with the second locking member 39, and the first unlocking member 74 cooperates with the second unlocking member 410.

[0130] The second locking element 39 is a locking groove located on the edge of the positioning plate 35 of the main shaft transmission mechanism 3; the first locking element 73 is a locking bearing fixed on the shift fork locking plate 7; when the main shaft 2 rotates to the open position, the locking bearing is locked in the locking groove.

[0131] The second unlocking component 410 is an unlocking bearing, which is fixed to the end face of the power gear 44; the first unlocking component 39 is an unlocking protrusion located on the edge of the shift fork locking plate 7. When the main shaft 2 rotates to the open position, the unlocking protrusion fits against the unlocking bearing; when the main shaft 2 needs to rotate to the closed position, the power gear 44 continues to rotate in the first direction, and the second unlocking component 410 (i.e., the unlocking bearing) pushes the first unlocking component 39 (i.e., the unlocking protrusion), causing the shift fork locking plate 7 to rotate away from the positioning plate 35 and the power gear 44, so that the first locking component 73 (i.e., the locking bearing) disengages from the second locking component 39 (i.e., the locking groove), and the main shaft 2 can quickly rotate to the closed position in the second direction under the action of the third reset component 38.

[0132] When the main shaft 2 rotates to the open position, the first locking element 73 engages with the second locking element 39, and the first unlocking element 39 abuts against the second unlocking element 410, keeping the positioning plate 35 and the drive gear 44 in the open position, thereby keeping the main shaft 2 in the open position. When the main shaft 2 is in the open position, the first locking element 73 and the second locking element 39 provide auxiliary positioning, preventing accidental valve closure due to vibration or external force. When the main shaft 2 needs to rotate to the closed position, the cooperation of the first unlocking element 39 and the second unlocking element 410 unlocks the main shaft 2, allowing it to automatically return to the closed position. This locking and unlocking structure is simple, reliable, requires no additional power, and improves the safety and stability of the actuator.

[0133] like Figures 4 to 6 , Figure 11As shown, the actuator for the smoke exhaust valve also includes a fuse tube 9 and a fuse tube transmission mechanism 10. The fuse tube 9 is disposed on the side of the mounting base plate 1 facing the smoke exhaust valve, with the fuse end 91 of the fuse tube 9 facing the smoke exhaust valve, and the limiting end 92 of the fuse tube 9 passing through the mounting base plate 1. The fuse tube transmission mechanism 10 is connected to the main shaft transmission mechanism 3, and the fuse tube transmission mechanism 10 is limited by the limiting end 92 of the fuse tube 9. After the fuse tube 9 melts, the limiting end 92 of the fuse tube 9 disengages from the fuse tube transmission mechanism 10, and the fuse tube transmission mechanism 10 drives the shift fork locking plate 7 away from the main shaft transmission mechanism 3 and the motor drive mechanism 4, and the main shaft 2 resets to the closed position.

[0134] The fuse tube 9 has its fuse end 91 facing the smoke exhaust valve, allowing for continuous temperature measurement. When the smoke exhaust valve's temperature exceeds the safe temperature, the low-melting-point alloy inside the fuse tube 9 melts, causing the limiting end 92 of the fuse tube 9 to retract and disengage from the fuse tube drive mechanism 10. Subsequently, the fuse tube drive mechanism 10 moves the shift fork locking plate 7 away from the main shaft drive mechanism 3 and the motor drive mechanism 4, releasing the restrictions on the main shaft drive mechanism 3 and the motor drive mechanism 4, allowing the main shaft 2 to return to the closed position.

[0135] Specifically, the fuse tube transmission mechanism 10 includes a fuse tube fork 101 and a fifth reset member 102. The fuse tube fork 101 is pivotally connected to the mounting base plate 1. The edges of the fuse tube fork 101 form a first limiting angle 103 and a second limiting angle 104. The first limiting angle 101 can contact the limiting end 92 of the fuse tube 9, and the second limiting angle 104 can contact the edge of the fork locking plate 7. The fifth reset member 102 always applies a force to the fuse tube fork 101, causing the first limiting angle 103 to abut against the limiting end 92 of the fuse tube 9. In this embodiment, the fifth reset member 102 is a tension spring.

[0136] When the fuse tube 9 melts, the limiting end 92 of the fuse tube 9 disengages from the first limiting angle 103. Under the action of the fifth reset member 102, the fuse tube fork 101 rotates, causing the second limiting angle 104 to push the fork locking plate 7 away from the main shaft transmission mechanism 3 and the motor drive mechanism 4, and the main shaft 2 can be reset to the closed position.

[0137] The fuse tube 9 is a key safety feature of the actuator. In the event of a fire, the fuse tube 9 melts, triggering the main shaft drive mechanism 3 to release the shift fork locking plate 7, causing the main shaft 2 to automatically return to the closed position, cutting off the airflow and preventing the fire from spreading. This design complies with fire protection regulations, achieves passive safety protection, requires no electrical or manual intervention, and has high reliability.

[0138] like Figure 5 , Figure 6As shown, the actuator for the smoke exhaust valve also includes a mounting plate 20, which is fixedly connected to the edge of the mounting base plate 1. The mounting plate 20 extends towards the smoke exhaust valve and is fixed to it. The mounting plate 20 forms a first mounting space 30 around the mounting base plate 1. The components of the main shaft 2, the main shaft transmission mechanism 3, and the motor drive mechanism 4 located on the side of the mounting base plate 1 facing the smoke exhaust valve are located within the first mounting space 30. In this embodiment, the third reset member 38 of the main shaft transmission mechanism 3 and the motor 42 of the motor drive mechanism 4 are located within the first mounting space 30.

[0139] like Figure 5 , Figure 6 As shown, the actuator for the smoke exhaust valve also includes a protective cover 40. The protective cover 40 is fixed on the side of the mounting base 1 away from the smoke exhaust valve, and a second mounting space 50 is formed between the protective cover 40 and the mounting base 1. The main shaft 2, the main shaft transmission mechanism 3, and the motor drive mechanism 4 located on the side of the mounting base 1 facing the protective cover 40 are located within the second mounting space 50. In this embodiment, the first connecting rod 31, the second connecting rod 32, the first reset member 33, the second reset member 34, the positioning plate 35, and the associated components of the main shaft transmission mechanism 3, and the motor gear 43, the power gear 44, the limiting boss 45, and the associated components of the motor drive mechanism 4 are located within the second mounting space 50.

[0140] The mounting plate 20, mounting base plate 1, and protective cover 40 form a dual mounting space, which rationally arranges the internal components of the actuator and improves the structural compactness and protection level of the actuator.

[0141] like Figures 1 to 6 As shown, the end of the main shaft 2 furthest from the smoke exhaust valve extends outside the protective cover 40. The actuator for this smoke exhaust valve also includes a handle 60, which is fixedly sleeved on the end of the main shaft 2 extending outside the protective cover 40. The handle 60 can drive the main shaft 2 to rotate around its axis. The design of the handle 60 facilitates manual operation, allowing for quick manual rotation of the main shaft 2 in emergencies or during maintenance to switch between open and closed positions. Simultaneously, while the main shaft 2 is rotating, the operator can observe the handle 60 to determine whether the main shaft 2 has reached the correct position, enhancing the practicality and flexibility of the actuator.

[0142] The main spindle 2 is also fitted with an indexing plate 70, which is fixed to the protective cover 40. The indexing plate 70 is marked with the rotation angle and the opening and closing angle positions, which can adjust the opening angle of the valve. When the main spindle 2 rotates, the operator can observe the indexing plate 70 to determine whether the main spindle 2 has rotated to the correct position.

[0143] like Figure 11As shown, when the actuator is in the closed state, the first limiting shaft 53 abuts against the edge of the positioning plate 35, the spring 54 is compressed towards the direction of the third micro switch 52, the limiting protrusion 37 of the positioning plate 35 abuts against the second limiting shaft 6, the first locking member 73 is attached to the edge of the positioning plate 35, the second micro switch 49 is in contact with the second positioning groove 48, and the main shaft 2 is in the closed position.

[0144] like Figure 12 As shown, when the actuator is in the open state, the transmission pin 41 disengages from the second connecting rod 32, the spring 54 pops out, the rotating rod 51 rotates, causing the first limiting shaft 53 to move and lock in the limiting groove 36, the control plate of the first micro switch 47 contacts the first positioning groove 46, the first locking member 73 is locked in the second locking member 39, and the first unlocking member 39 is attached to the second unlocking member 410. When the actuator needs to switch from the open state to the closed state, the power gear 44 continues to rotate in the first direction, causing the second unlocking member 410 to push the first unlocking member 39, causing the shift fork locking plate 7 to rotate away from the positioning plate 35 and the power gear 44, causing the first locking member 73 to disengage from the second locking member 39, and the main shaft 2 can quickly rotate to the closed position in the second direction under the action of the third reset member 38.

[0145] like Figure 13 As shown, when the fuse end 91 of the fuse tube 9 melts, the limiting end 92 of the fuse tube 9 retracts. Under the action of the fifth reset member 102, the fuse tube fork 101 rotates, causing the second limiting angle 104 to push the fork locking plate 7 away from the second locking member 39 of the positioning plate 35, so that the main shaft 2 is quickly reset to the closed position under the force of the third reset member 38.

[0146] The actuator for smoke exhaust valves of this utility model achieves high adaptability, high reliability, and high safety through a symmetrical design, a combination of multiple reset components, a combination of mechanical and electrical limit switches, an automatic locking mechanism, and a fusible link protection mechanism. Its simplified structure reduces production costs and maintenance difficulty, and it is suitable for various specifications of smoke exhaust valves, meeting the dual requirements of the building ventilation industry for actuator performance and economy.

[0147] This utility model is not limited to the above-described embodiments. Any changes in its shape or structure fall within the protection scope of this utility model. The protection scope of this utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. An actuator for a smoke exhaust valve, characterized in that, include: Mounting base plate, the mounting base plate is fixed to the outside of the smoke exhaust valve, the extension direction of the mounting base plate is perpendicular to the rotation axis of the smoke exhaust valve, and the mounting base plate is provided with a vertically arranged symmetrical center line; The main shaft passes laterally through the mounting base plate, and the end of the main shaft facing the smoke exhaust valve is coaxially connected to the rotating shaft of the smoke exhaust valve. The axis of the main shaft is located on the center line of symmetry of the mounting base plate. A main shaft drive mechanism, which is sleeved on the main shaft and circumferentially connected to the main shaft; A motor drive mechanism is mounted on the mounting base plate and is connected to the spindle transmission mechanism. The motor drive mechanism is located below the spindle transmission mechanism. The shift fork locking plate has a fixed end and a movable end at its two ends. The fixed end of the shift fork locking plate is pivotally connected to the mounting base plate. The shift fork locking plate is disposed on the side of the main shaft transmission mechanism and the motor drive mechanism. The third reset component is sleeved on the main shaft, and its two ends are fixed to the outer peripheral surface of the main shaft and the mounting base plate, respectively. The third reset component always applies a force to the main shaft to rotate in the second direction. The motor drive mechanism can drive the main shaft to rotate around the axis in a first direction through the main shaft transmission mechanism, so that the main shaft rotates to the open position, and the main shaft transmission mechanism is locked by the shift fork locking plate; the motor drive mechanism continues to rotate in the first direction, the shift fork locking plate is unlocked from the main shaft transmission mechanism, and the third reset member drives the main shaft to rotate around the axis in a second direction, so that the main shaft rotates to the closed position; the rotation directions of the first direction and the second direction are opposite.

2. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The motor drive mechanism is equipped with a transmission pin; the main shaft transmission mechanism includes: The first connecting rod, one end of which is fixedly sleeved on the main shaft; The second link is hinged to the end of the first link away from the main shaft, and the end of the second link away from the hinge point can abut against the transmission pin. The transmission pin is arranged on the path of the second link rotating in the first direction. The first reset component is connected to the second connecting rod and the main shaft, and the first reset component always applies a rotational force to the second connecting rod in the first direction; The second reset member is connected to the second connecting rod, and the second reset member always applies a force to the second connecting rod to rotate in the second direction; When the motor drive mechanism rotates, the transmission pin drives the main shaft to rotate in the first direction through the second connecting rod and the first connecting rod; when the main shaft rotates to the open position, the transmission pin disengages from the second connecting rod.

3. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The main shaft transmission mechanism also includes a positioning plate, which is fixedly sleeved on the main shaft, and the edge of the positioning plate is provided with a limiting groove; The actuator for the smoke exhaust valve also includes a first limiting mechanism, which is disposed in the circumferential direction of the positioning plate; when the main shaft rotates to the open position, the first limiting mechanism is locked in the limiting groove.

4. The actuator for a smoke exhaust valve as described in claim 3, characterized in that: The first limiting mechanism includes: A rotating rod, one end of which is pivotally connected to the mounting base plate, and the other end of which is provided with a first limiting shaft; The third micro switch is provided with a spring contacting the end of the rotating rod. The spring contact and the first limiting shaft are located at the same end of the rotating rod. The third micro switch is electrically connected to the motor drive mechanism. When the main shaft rotates to the open position, the spring pops out, causing the first limiting shaft to be locked in the limiting groove. The third micro switch sends a signal to the motor drive mechanism, and the motor drive mechanism stops rotating.

5. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The main shaft transmission mechanism also includes a positioning plate, which is coaxially sleeved on the main shaft, and the edge of the positioning plate is provided with a limiting protrusion; The actuator for the smoke exhaust valve also includes a second limiting shaft, which is fixed on the mounting base plate and is arranged around the circumference of the positioning plate. The second limiting shaft is located on the path of the limiting protrusion rotating in the second direction. When the main shaft rotates to the closed position, the second limiting shaft abuts against the limiting protrusion.

6. The actuator for a smoke exhaust valve as described in claim 1, characterized in that, The motor drive mechanism includes: The motor, wherein the main body of the motor is fixed to the mounting base plate; Motor gear, wherein the motor gear is coaxially fixed with the rotating shaft of the motor; The power gear has a rotating shaft fixed on the mounting base plate. The power gear can rotate around its own axis. The power gear meshes with the motor gear. A transmission pin is provided on the end face of the power gear. The transmission pin abuts against the main shaft transmission mechanism. When the motor drives the power gear to rotate through the motor gear, the transmission pin pulls the main shaft transmission mechanism to rotate the main shaft around the first direction.

7. The actuator for a smoke exhaust valve as described in claim 6, characterized in that, The motor drive mechanism also includes: A limiting boss is formed on the end face of the power gear facing the mounting base plate, and a first positioning groove is provided in the circumferential direction of the limiting boss. A first micro switch is disposed around the circumference of the limiting boss and is electrically connected to the main motor. When the main shaft rotates to the open position, the control piece of the first micro switch contacts the first positioning groove, the first micro switch is disconnected, and the motor stops rotating.

8. The actuator for a smoke exhaust valve as described in claim 6, characterized in that, The motor drive mechanism further includes: A limiting boss is formed on the end face of the power gear facing the mounting base plate, and a second positioning groove is provided in the circumferential direction of the limiting boss. The second micro switch is disposed around the circumference of the limiting boss and is electrically connected to the main motor. When the main shaft rotates to the closed position, the control piece of the second micro switch contacts the second positioning groove, the second micro switch is disconnected, and the motor stops rotating.

9. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The actuator for the smoke exhaust valve also includes: The fourth reset component is connected to the movable end of the shift fork locking plate, and the fourth reset component always applies a force to the shift fork locking plate that moves towards the main shaft transmission mechanism and the motor drive mechanism; The area of ​​the shift fork locking plate facing the main shaft transmission mechanism is provided with a first locking member, and the main shaft transmission mechanism is provided with a second locking member; the area of ​​the shift fork locking plate facing the motor drive mechanism is provided with a first unlocking member, and the motor drive mechanism is provided with a second unlocking member; when the main shaft rotates to the open position, the first locking member and the second locking member cooperate, and the first unlocking member and the second unlocking member cooperate.

10. The actuator for a smoke exhaust valve as described in claim 9, characterized in that: The main shaft transmission mechanism includes a positioning plate, which is coaxially fixed on the main shaft. The second locking member is a locking groove provided on the edge of the positioning plate. The first locking member is a locking bearing fixed on the shift fork locking plate. When the main shaft rotates to the open position, the locking bearing is locked in the locking groove.

11. The actuator for a smoke exhaust valve as described in claim 9, characterized in that: The motor drive mechanism also includes a power gear, the rotating shaft of which is fixed on the mounting base plate. The power gear can rotate around its own axis, and when the power gear rotates, it drives the main shaft transmission mechanism to operate. The second unlocking component is an unlocking bearing, which is fixed to the end face of the power gear; the first unlocking component is an unlocking protrusion provided on the edge of the shift fork locking plate; when the main shaft rotates to the open position, the unlocking protrusion fits against the unlocking bearing.

12. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The actuator for the smoke exhaust valve also includes: A fuse tube is disposed on the side of the mounting base facing the smoke exhaust valve, the fuse tube has its fuse end facing the smoke exhaust valve, and the limiting end of the fuse tube passes through the mounting base. A fuse tube drive mechanism is connected to the main shaft drive mechanism, and the fuse tube drive mechanism is limited by the limiting end of the fuse tube. After the fuse tube melts, the limiting end of the fuse tube disengages from the fuse tube transmission mechanism. The fuse tube transmission mechanism then drives the shift fork locking plate away from the main shaft transmission mechanism and the motor drive mechanism, and the main shaft resets to the closed position.

13. The actuator for a smoke exhaust valve as described in claim 12, characterized in that: The fuse tube transmission mechanism includes: A fuse tube fork is pivotally connected to the mounting base plate. The edges of the fuse tube fork form a first limiting angle and a second limiting angle. The first limiting angle can contact the limiting end of the fuse tube, and the second limiting angle can contact the edge of the fork locking plate. The fifth reset component always applies a force to the fuse tube fork, causing the first limiting angle to abut against the limiting end of the fuse tube; After the fuse tube melts, the limiting end of the fuse tube disengages from the first limiting angle, the fuse tube fork rotates, and the second limiting angle pushes the fork locking plate away from the main shaft transmission mechanism and the motor drive mechanism, and the main shaft resets to the closed position.

14. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The actuator for the smoke exhaust valve also includes a mounting plate, which is fixedly connected to the edge of the mounting base plate. The mounting plate extends toward the smoke exhaust valve and is fixed to the smoke exhaust valve. The mounting plate forms a first mounting space around the mounting base plate. The main shaft, main shaft transmission mechanism, and motor drive mechanism located on the side of the mounting base plate facing the smoke exhaust valve are located within the first mounting space.

15. The actuator for a smoke exhaust valve as described in claim 1, characterized in that: The actuator for the smoke exhaust valve also includes a protective cover, which is fixedly placed on the side of the mounting base away from the smoke exhaust valve. A second mounting space is formed between the protective cover and the mounting base. The main shaft, main shaft transmission mechanism, and motor drive mechanism located on the side of the mounting base facing the protective cover are located within the second mounting space.

16. The actuator for a smoke exhaust valve as described in claim 15, characterized in that: The end of the main shaft away from the smoke exhaust valve extends to the outside of the protective cover; the actuator for the smoke exhaust valve also includes a handle, which is fixedly sleeved on the end of the main shaft extending to the outside of the protective cover, and the handle can drive the main shaft to rotate around the axis.

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