Accurate reset fire damper actuator

Abstract

A precise reset fire damper actuator relates to the field of fire damper actuating mechanisms and is provided with a reset motor, the reset motor is connected with a stop-limiting gear, the upper end of the stop-limiting gear is connected with a fan-shaped shaft, and the stop-limiting gear is connected with a main shaft gear; during resetting, the main shaft needs to anticlockwise rotate by 90 degrees, the corresponding rotation turns or angle of the resetting motor can be calculated through the transmission ratio, the resetting motor is stopped at the set rotation angle through setting of an encoder, the relative angle of the fan-shaped shaft and the stopping limiting gear in the radial direction is set accordingly, the fan-shaped shaft abuts against the first microswitch, and the resetting motor is stopped; the reset angle of the main shaft can be accurately positioned at 90 degrees when the reset motor runs without repeated setting; the multi-stage reduction gear is driven by the reset gear, so that low-speed stable rotation of the main shaft can be realized; the microswitches are arranged on the two sides of the shifting fork respectively, the touch pressing plates connected with the shifting fork abut against the microswitches on the two sides respectively, the microswitches correspond to complete rotation of the main shaft, and the problem of feedback signal distortion is avoided.

Description

Technical Field

[0001] The utility model relates to the field of fire damper actuators, in particular to a precise resetting fire damper actuator. Background Art

[0002] CN221423995U discloses an easy-to-assemble fire smoke exhaust valve actuator, specifically discloses a ratchet and pawl structure, a fork and a lever structure for limiting the rotation of the main shaft, and a pull ring, an electromagnet, and a temperature sensor for releasing the rotation limit of the main shaft. The actuator has two states: a waiting execution state (or a reset state) and a post-execution state (or a post-action state). In the post-execution state, the main shaft needs to rotate 90 degrees counterclockwise to make the ratchet and the pawl engage. The rotation angle is mostly controlled by a rotation limit. Due to installation errors, the actual rotation angle is often less than 90 degrees or more than 90 degrees, and the fire damper associated with the actuator is not rotated in place or over-rotated. In the over-rotation situation, the fire damper stops running after rotating 90 degrees, and the actuator still has a certain speed. Its collision and extrusion stress will cause damage to the actuator, further affecting its accuracy.

[0003] In the cooperation between the ratchet and the pawl, the movement is one-way intermittent. Every time the pawl pushes the ratchet, an instantaneous impact is generated. Especially at high speed or high load, the impact is aggravated, resulting in reduced rotation accuracy. In addition, the ratchet mechanism is susceptible to friction and wear, further reducing accuracy.

[0004] During the resetting process of the actuator, it is often necessary to cooperate with the operation of a handle or a wrench to overcome the force of the torsion spring on the main shaft. In order to make the action process stable and powerful, the torque system of the torsion spring on the main shaft is usually large. In order to overcome the torque of the torsion spring and reset the actuator in the post-execution state, the operator needs to apply a large force. However, this force is often not along the tangential direction of the rotation direction, and radial thrust or pulling force will also be generated. Thrust or pulling force is an unexpected force. Since a large force is required to overcome the spring torque, the accompanying thrust or pulling force is often also large, which may cause unexpected deflection of the main shaft, causing the main shaft to squeeze other related components, resulting in distortion of the fire damper actuator, affecting the overall stability and reducing the working accuracy of the actuator.

[0005] After the actuator switches between the waiting execution state and the post-execution state, it is often associated with the micro switch to transmit the action state information. CN222392111U discloses a fire damper actuator that is convenient for replacing the temperature sensor, and specifically discloses the association structure of the fork and the micro switch. When the fork abuts against the spring of the micro switch, the micro switch will transmit feedback information that the actuator is in the waiting execution state. When the fork is away from the spring of the micro switch, the micro switch will transmit information that the actuator is in the post-execution state. However, the above logic may cause the following errors. When the fork is away from the spring of the micro switch, the micro switch immediately transmits the information that the actuator is in the post-execution state, but the spindle has not rotated to the right position, resulting in signal distortion, and the fire damper corresponding to the spindle has not rotated to the right position. If the signal is used as the basis for subsequent operations, or as the starting signal for the execution of other processes in the automated operation, it may cause errors. When the equipment fails, it may happen that the fork is away from the micro switch, but the spindle cannot rotate to the right position, and it cannot be known in time from the feedback signal. Utility Model Content

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the utility model provides a precise reset fire damper actuator, which solves the problem of the fire damper actuator's rotation angle being not precise enough during resetting; solves the problem of the fire damper actuator's reset force being difficult to control during the reset operation, which easily leads to the fire damper actuator's twisting and deformation; solves the problem of feedback signal distortion when the fire damper actuator switches between the waiting execution state and the post-execution state.

[0008] (II) Technical solution

[0009] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] A precise reset fire damper actuator is provided with a shell, a junction box, a main shaft, a shift fork, and a lever structure; a clamping column is provided in the middle of the shift fork, a wheel disc is fixedly provided on the main shaft, an arc-shaped groove adapted to the clamping column is provided on the wheel disc, a tension spring is connected near the end where the shift fork is connected to the lever structure, and the tension of the tension spring makes the shift fork close to the wheel disc; a reset motor is provided, a reset gear is connected to the shaft end of the reset motor, the reset gear is connected to the limit stop gear, the limit stop gear is connected to the main shaft gear, the main shaft gear is fixedly connected to the lower part of the main shaft, a fan-shaped shaft is connected to the upper end of the limit stop gear, the cross-section of the fan-shaped shaft is fan-shaped, the fan-shaped shaft is connected to a first micro switch, and the radial relative angle between the fan-shaped shaft and the limit stop gear is adjustable.

[0011] Preferably, an intermediate support plate and a bottom support are provided, a column is connected between the intermediate support plate and the bottom support, the edges of the intermediate support plate and the bottom support are surrounded by a shell, a terminal box is connected to the outer side of the shell, a main shaft is rotatably provided on the upper end of the intermediate support plate, a torsion spring is sleeved on the main shaft, a handle is connected to the upper end of the main shaft, the lower end of the main shaft passes through the intermediate support plate and the bottom support, and a rotation limit is connected to the lower end of the main shaft; a shift fork is provided, one end of which is rotatably provided on the upper end of the intermediate support plate; a lever structure is provided, and the middle part of the lever structure is rotatably provided on the intermediate support plate end, one end of the lever structure is connected to an electromagnet, and a temperature sensor is arranged near the end, the electromagnet is provided with an iron core, the lever structure is connected to the outer end of the iron core, a spring is sleeved on the iron core, the other end of the lever structure is connected to a pull rope, and a card slot is arranged near the end, and the card slot is adapted to be connected with the other end of the shift fork; the lower end of the torsion spring is connected to the middle support plate, and the upper end is connected to the wheel plate; the reset gear, the limit stop gear, and the main shaft gear are rotatably arranged between the middle support plate and the bottom support; the inner end of the junction box is electrically connected to the electromagnet, the reset motor, and the first micro switch respectively.

[0012] Preferably, the upper end of the limit stop gear is connected to a mounting base, the upper end of the mounting base is connected to a fan-shaped shaft, the fan-shaped shaft is axially provided with a through hole, and is also provided with an adjusting screw, and the adjusting screw passes through the through hole and is cooperatively connected with the mounting base.

[0013] Preferably, a touch pressure plate extending vertically toward the lower end is connected near the end of the fork connecting lever structure, a second micro switch and a third micro switch are respectively connected to both sides of the touch pressure plate, and the inner end of the junction box is respectively connected to the second micro switch and the third micro switch.

[0014] Preferably, the reset gear is connected to a first reduction gear, the first reduction gear is connected to a second reduction gear, the second reduction gear is connected to a stop gear, the stop gear is connected to a main shaft gear, and the main shaft gear is configured as a sector gear.

[0015] Preferably, a mounting hole seat is provided on the middle support plate, a temperature sensor is inserted into the mounting hole seat, a hole corresponding to the mounting hole seat is provided on the bottom support, and the temperature sensor passes through the hole.

[0016] Preferably, a wire tube is connected between the junction box and the shell.

[0017] (III) Beneficial effects

[0018] The utility model provides a fire damper actuator with precise reset, which has the following beneficial effects:

[0019] By setting a reset motor, the limit stop gear is driven, and the limit stop gear drives the main shaft gear; during the reset process when the actuator enters the waiting execution state from the post-execution state, the main shaft needs to be rotated 90 degrees. The corresponding number of rotations or angles of the reset motor can be calculated by the transmission ratio. The reset motor driver supports use with an encoder. The encoder can accurately measure the rotation angle and number of turns of the motor shaft. When the number of turns fed back by the encoder reaches the set value, the driver controls the reset motor to stop running; according to the stop position, the relative angle between the sector shaft and the limit stop gear is adjusted so that the spring of the first micro switch is in the signal switching state, corresponding to the stop of the reset motor. As a result, the reset motor can drive the reset gear to drive the main shaft to rotate accurately 90 degrees to achieve precise reset.

[0020] During the gear transmission process, multi-stage speed change can be achieved by transmitting the reset gear, the first reduction gear, the second reduction gear, and the limit gear to the main shaft gear, so that the main shaft gear can rotate stably at a low speed and high torque, and the rotational force is along the tangential direction of the gear to avoid distortion of the actuator.

[0021] By connecting a touch-pressure plate extending vertically toward the lower end near the end of the fork connecting lever structure, the two sides of the touch-pressure plate are respectively abutted against the second microswitch and the third microswitch. When the touch-pressure plate abuts against the spring of the second microswitch, it corresponds to the post-execution state, and when the touch-pressure plate abuts against the third microswitch, it corresponds to the waiting for execution state. The above two states both correspond to the full rotation of the main shaft, and the state feedback signal transmitted through the microswitch is accurate and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a top view schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the installation hole position of the utility model from a top view;

[0024] Figure 3 This is a schematic diagram of the main structure of the utility model;

[0025] Figure 4 It is a rear view schematic diagram of the structure of the utility model;

[0026] Figure 5 This is a schematic diagram of the gear transmission relationship of the utility model;

[0027] Figure 6 It is a schematic diagram of the connection relationship of each component after the utility model is executed;

[0028] Figure 7 This is a schematic diagram of the connection relationship of various components in the utility model in the waiting execution state;

[0029] Figure 8It is a schematic diagram showing the connection status of the two ends of the wire tube of the utility model to the housing and the junction box respectively.

[0030] In the figure, 11-middle support plate, 111-mounting hole seat, 12-bottom support, 13-column, 14-housing, 21-junction box, 22-electromagnet, 221-iron core, 222-spring, 23-reset motor, 24-first micro switch, 25-second micro switch, 26-third micro switch, 27-wire tube, 3-spindle, 31-torsion spring, 32-handle, 33-rotation limit, 34-wheel, 341-arc groove, 4-shift fork, 41-card column, 42-tension spring, 43-touch plate, 5-lever structure, 51-pull rope, 52-card slot, 6-temperature sensor, 71-reset gear, 72-first reduction gear, 73-second reduction gear, 74-limit stop gear, 75-spindle gear, 8-fan-shaped shaft, 81-mounting base, 82-adjusting screw. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the embodiments of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "upper", "lower", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0034] In the description of the embodiments of the present invention, in the description of the rotation direction, the clockwise or counterclockwise description, unless otherwise specified, is based on the rotation direction when viewed from a top perspective.

[0035] See also Figure 1-Figure 4 , Figure 6The embodiment of the utility model provides a technical solution: a precise reset fire damper actuator, which is provided with a housing 14, a junction box 21, a main shaft 3, a fork 4, and a lever structure 5; a clamping column 41 is provided in the middle of the fork 4, a wheel disc 34 is fixedly provided on the main shaft 3, and an arc groove 341 adapted to the clamping column 41 is provided on the wheel disc 34, and a tension spring 42 is connected near the end where the fork 4 is connected to the lever structure 5, and the tension of the tension spring 42 makes the fork 4 close to the wheel disc 34; a reset motor 23 is provided, and a reset gear 71 is connected to the shaft end of the reset motor 23, and the reset gear 71 is connected to the limit stop gear 74, and the limit stop gear 74 is connected to the main shaft gear 75, and the main shaft gear 75 is fixedly connected to the lower part of the main shaft 3, and a fan-shaped shaft 8 is connected to the upper end of the limit stop gear 74, and the cross section of the fan-shaped shaft 8 is fan-shaped, and the fan-shaped shaft 8 is connected to the first micro switch 24, and the radial relative angle between the fan-shaped shaft 8 and the limit stop gear 74 is adjustable.

[0036] See also Figure 1-Figure 4 , Figure 6In this embodiment, an intermediate support plate 11 and a bottom support plate 12 are provided, a column 13 is connected between the intermediate support plate 11 and the bottom support plate 12, the edges of the intermediate support plate 11 and the bottom support plate 12 are surrounded by a shell 14, and a terminal box 21 is connected to the outer side of the shell 14. A main shaft 3 is rotatably provided at the upper end of the intermediate support plate 11, a torsion spring 31 is sleeved on the main shaft 3, a handle 32 is connected to the upper end of the main shaft 3, the lower end of the main shaft 3 passes through the intermediate support plate 11 and the bottom support plate 12, and a rotation limit 33 is connected to the lower end of the main shaft 3; a shift fork 4 is provided, one end of which is rotatably provided at the upper end of the intermediate support plate 11; a lever structure 5 is provided, and the middle part of the lever structure 5 is rotatably provided at the upper end of the intermediate support plate 11 One end of the lever structure 5 is connected to an electromagnet 22, and a temperature sensor 6 is arranged near the end. The electromagnet 22 is provided with an iron core 221. The lever structure 5 is connected to the outer end of the iron core 221. A spring 222 is sleeved on the iron core 221. The other end of the lever structure 5 is connected to a pull rope 51, and a slot 52 is arranged near the end. The slot 52 is adapted to be engaged with the other end of the fork 4; the lower end of the torsion spring 31 is connected to the middle support plate 11, and the upper end is connected to the wheel 34; the reset gear 71, the limit stop gear 74, and the main shaft gear 75 are rotatably arranged between the middle support plate 11 and the bottom support 12; the inner end of the junction box 21 is electrically connected to the electromagnet 22, the reset motor 23, and the first micro switch 24 respectively. It should be noted that: the junction box 21 usually has multiple wiring terminals, which are divided into inner and outer ends, and each terminal corresponds to a line, that is, the wiring terminal is a conductor that is convenient for connecting the inner and outer ends. The inner end is connected to the electromagnet 22, the first microswitch 24, the reset motor 23, etc. in the actuator, and the outer end is connected to the power supply and the input / output signal line; the space between the middle support plate 11 and the bottom support 12 provides a storage space for the transmission gear (in this embodiment, the transmission gear refers to the reset gear 71, the limit stop gear 74, and the main shaft gear 75); the actuator has two states, the waiting execution state (or reset state) and the post-execution state (or post-action state). In the post-execution state, the reset motor 23 drives the reset gear 71 to rotate, and the reset The gear 71 drives the limit stop gear 74 to rotate, and the limit stop gear 74 drives the main shaft gear 75 to rotate. When the main shaft gear 75 rotates 90 degrees counterclockwise, the limit stop gear 74 synchronously rotates a certain number of circles or angles (the rotation angle of the limit stop gear 74 is related to the gear transmission ratio), driving the fan-shaped shaft 8 to abut against the spring of the first microswitch 24, and transmits a stop signal for limiting operation, so that the reset motor 23 stops running; the logic of making the main shaft 3 rotate 90 degrees counterclockwise to stop is: through the transmission ratio, the rotation angle or number of circles of the reset gear 71 when the main shaft gear 75 rotates 90 degrees can be accurately calculated, and the driver and encoder of the reset motor 23 are used together. The encoder can accurately measure the rotation angle and number of circles of the motor shaft and feed the signal back to the driver.By setting the target number of revolutions in the driver, when the number of revolutions fed back by the encoder reaches the set value, the driver will control the motor to stop running; according to the stop position, the radial relative angle between the sector shaft 8 and the limit stop gear 74 is adjusted so that the spring of the first micro switch 24 is just in the signal switching state, corresponding to the stop action of the reset motor 23. After the setting is completed, it can be used directly in the future without repeated setting, so that when the reset motor 23 is running, the reset angle of the main shaft 3 can be accurately positioned at 90 degrees. At the same time, this positioning method can offset the position installation error of the first micro switch 24; the handle 32 can also be used as a backup for rotating the main shaft 3 to reset it. Use tools; the temperature sensor 6 is a temperature sensor of the prior art, and can be referred to as a fire damper actuator disclosed in CN222392111U for convenient replacement of the temperature sensor. At the critical point of temperature sensing, the temperature sensor core falls off from the main body, and the conical cap on the top hits the end of the lever structure 5 connected to the electromagnet 22, so that the end of the lever structure 5 connected to the fork 4 is away from the fork 4, releasing the clamping restriction on the fork 4, and then the main shaft 3 rotates under the torsion of the torsion spring 31; the rotation limit 33 is used to limit the rotation stop position of the main shaft 3 during the execution of the action. Since the reset angle is set to 90 degrees, the reverse rotation angle is also correspondingly 90 degrees.

[0037] See also Figure 5 In this embodiment, the upper end of the limit stop gear 74 is connected to a mounting base 81, and the upper end of the mounting base 81 is connected to a fan-shaped shaft 8. The fan-shaped shaft 8 is axially provided with a through hole and an adjusting screw 82. The adjusting screw 82 passes through the through hole and is connected to the mounting base 81.

[0038] See also Figure 1 , Figure 6-Figure 7 In this embodiment, the fork 4 is connected to the end of the lever structure 5 with a touch plate 43 extending vertically to the lower end, and the touch plate 43 is connected to the second micro switch 25 and the third micro switch 26 on both sides, and the inner end of the junction box 21 is connected to the second micro switch 25 and the third micro switch 26. It should be noted that the traditional fire damper actuator only sets one of the second micro switch 25 and the third micro switch 26 as the output signal of the actuator state, which may lead to the following errors: when the fork 4 is not rotated to the right position during the rotation process, a state signal is transmitted, which is used as an operation basis or as an output signal for automatic processing, which may lead to unexpected situations. When the equipment cannot be rotated to the right position due to a malfunction, the setting of the double micro switches can also be discovered and handled in time.

[0039] See also Figure 5In this embodiment, the reset gear 71 is connected to a first reduction gear 72, the first reduction gear 72 is connected to a second reduction gear 73, the second reduction gear 73 is connected to a stop gear 74, the stop gear 74 is connected to a main shaft gear 75, and the main shaft gear 75 is configured as a fan gear. It should be particularly noted that: the main shaft gear 75 is the final gear of the gear transmission, and its rotation angle is only between plus and minus 90 degrees. It is configured as a fan gear to reduce the size of the main shaft gear 75 and avoid touching other components; the stop gear 74 is also a reduction gear, which plays a deceleration role. The torque transmitted by the reset motor 23, through the deceleration effect of the three reduction gears, provides a low-speed and high-torque torque for the main shaft gear 75.

[0040] See also Figure 1-Figure 3 In this embodiment, a mounting hole seat 111 is provided on the middle support plate 11, and the temperature sensor 6 is inserted into the mounting hole seat 111. A hole corresponding to the mounting hole seat 111 is provided on the bottom support 12, and the temperature sensor 6 passes through the hole.

[0041] See also Figure 8 In this embodiment, a wire tube 27 is connected between the junction box 21 and the housing. It should be noted that the inner cavity of the wire tube 27 is used to fill the wires, that is, the inner end of the junction box 21 is connected to the electromagnet 22, the first micro switch 24, the reset motor 23, the second micro switch 25, and the third micro switch 26 through the multiple wires filled in the wire tube 27; the wire tube 27 can extend the distance between the actuator body and the junction box 21, which is convenient for the wiring operation of the outer end of the junction box 21. For example, when the actuator body is used to handle an unfavorable high-altitude workstation, the outer end wiring can be conveniently completed through the junction box 21 extending to the lower end.

[0042] The working principle and use process of the utility model: before use, according to the transmission ratio, the main shaft 3 rotates 90 degrees to calculate the number of rotations or angles of the reset motor 23. The driver of the reset motor 23 supports the use with the encoder. When the driver of the reset motor 23 and the encoder are used together, the encoder can accurately measure the rotation angle and number of rotations of the motor shaft and feed back the signal to the driver. By setting the target number of rotations in the driver, when the number of rotations fed back by the encoder reaches the set value, the driver will control the motor to stop running; according to the stop position, adjust the radial relative angle between the fan-shaped shaft 8 and the limit stop gear 74 so that the spring of the first micro switch 24 is just in the signal switching state, corresponding to the stop action of the reset motor 23. At this time, tighten the adjustment screw 82, complete the setting, and then it can be used directly in the future without repeated setting. When the reset motor 23 is running, the reset angle of the main shaft 3 can be accurately positioned at 90 degrees; when the reset angle is 90 degrees, the rotation angle of this actuator during the execution of the action is also 90 degrees; when in use, this actuator has two states: waiting for execution state (or reset state) and after execution State (or post-action state), when the actuator is in the post-execution state, in order to reset it, the reset motor 23 is started, the reset motor 23 drives the reset gear 71 to rotate, the reset gear 71 drives the first reduction gear 72 to rotate, the first reduction gear 72 drives the second reduction gear 73 to rotate, the second reduction gear 73 drives the limit stop gear 74 to rotate, the limit stop gear 74 drives the main shaft gear 75 to rotate, when the main shaft 3 rotates 90 degrees, the clamping column 41 of the fork 4 sinks into the arc groove 341 of the wheel disc 34 under the tension of the tension spring 42, the fan-shaped shaft 8 abuts against the spring of the first microswitch 24, so that the first microswitch 24 switches the internal circuit state, and the reset motor 23 stops running, thereby realizing precise reset angle control. At this time, by pulling the pull rope 51, energizing the electromagnet 22, and the core of the temperature sensor 6 falling off at the critical temperature, the end of the lever structure 5 connected to the fork 4 will move away from the fork 4, thereby releasing the restriction on the fork 4. Under the torsion force of the torsion spring 31, the main shaft 3 squeezes the clamping column 41 of the fork 4, squeezes the clamping column 41 out of the arc groove 341, and rotates 90 degrees, and stops rotating under the action of the rotation limit 33.

[0043] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A precise reset fire damper actuator, comprising a housing (14), a junction box (21), a main shaft (3), a shift fork (4), and a lever structure (5); It is characterized in that A clamping column (41) is arranged in the middle of the shift fork (4), a wheel disc (34) is fixedly arranged on the main shaft (3), an arc-shaped groove (341) adapted to the clamping column (41) is arranged on the wheel disc (34), and a tension spring (42) is connected near the end of the shift fork (4) connected to the lever structure (5), and the tension of the tension spring (42) causes the shift fork (4) to approach the wheel disc (34); A reset motor (23) is provided, the shaft end of the reset motor (23) is connected to a reset gear (71), the reset gear (71) is connected to a stop gear (74), the stop gear (74) is connected to a main shaft gear (75), the main shaft gear (75) is fixedly connected to the lower part of the main shaft (3), the upper end of the stop gear (74) is connected to a fan-shaped shaft (8), the cross section of the fan-shaped shaft (8) is fan-shaped, the fan-shaped shaft (8) is connected to a first micro switch (24), and the radial relative angle between the fan-shaped shaft (8) and the stop gear (74) is adjustable.

2. The precise reset fire damper actuator according to claim 1, characterized in that: An intermediate support plate (11) and a bottom support (12) are provided, a column (13) is connected between the intermediate support plate (11) and the bottom support (12), the edges of the intermediate support plate (11) and the bottom support (12) are surrounded by a shell (14), the outer side of the shell (14) is connected to a junction box (21), a main shaft (3) is rotatably provided at the upper end of the intermediate support plate (11), a torsion spring (31) is sleeved on the main shaft (3), a handle (32) is connected to the upper end of the main shaft (3), the lower end of the main shaft (3) passes through the intermediate support plate (11) and the bottom support (12), and the lower end of the main shaft (3) is connected to a rotation limiter (33); A shift fork (4) is provided, one end of which is rotatably arranged on the upper end of the middle support plate (11); A lever structure (5) is provided, wherein the middle part of the lever structure (5) is rotatably arranged on the upper end of the middle support plate (11), one end of the lever structure (5) is connected to an electromagnet (22), and a temperature sensor (6) is arranged near the end, the electromagnet (22) is provided with an iron core (221), the lever structure (5) is connected to the outer end of the iron core (221), a spring (222) is sleeved on the iron core (221), the other end of the lever structure (5) is connected to a pull rope (51), and a slot (52) is arranged near the end, and the slot (52) is adapted to be snap-connected with the other end of the shift fork (4); The torsion spring (31) has a lower end connected to the middle support plate (11) and an upper end connected to the wheel disc (34); The reset gear (71), the stop gear (74), and the main shaft gear (75) are rotatably arranged between the middle support plate (11) and the bottom support (12); The inner end of the junction box (21) is electrically connected to the electromagnet (22), the reset motor (23), and the first micro switch (24) respectively.

3. The precise reset fire damper actuator according to claim 1, characterized in that: The upper end of the stop gear (74) is connected to a mounting base (81), the upper end of the mounting base (81) is connected to a fan-shaped shaft (8), the fan-shaped shaft (8) is axially provided with a through hole, and is also provided with an adjusting screw (82), the adjusting screw (82) passes through the through hole and is matched with the mounting base (81).

4. The precise reset fire damper actuator according to claim 1, characterized in that: A touch plate (43) extending vertically toward the lower end is connected near the end of the shift fork (4) connecting the lever structure (5); the second micro switch (25) and the third micro switch (26) are respectively connected to the two sides of the touch plate (43); and the inner end of the junction box (21) is respectively connected to the second micro switch (25) and the third micro switch (26).

5. The precise reset fire damper actuator according to claim 1, characterized in that: The reset gear (71) is connected to a first reduction gear (72), the first reduction gear (72) is connected to a second reduction gear (73), the second reduction gear (73) is connected to a stop gear (74), the stop gear (74) is connected to a main shaft gear (75), and the main shaft gear (75) is configured as a sector gear.

6. The precise reset fire damper actuator according to claim 2, characterized in that: The middle support plate (11) is provided with a mounting hole seat (111), a temperature sensor (6) is inserted into the mounting hole seat (111), and the bottom support (12) is provided with a hole corresponding to the mounting hole seat (111), and the temperature sensor (6) passes through the hole.

7. The precise reset fire damper actuator according to claim 1, characterized in that: A wire tube (27) is connected between the junction box (21) and the housing.

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