Fire door sequencer

Abstract

This application discloses a fire door sequencer and a molding method. The fire door sequencer includes: a base, a support member, a locking component, a detection component, and a control component. The support member is movably mounted on the base and has a supporting state for supporting the main door and a yielding state that allows the main door to pass through. The locking component is mounted on the base and is used to selectively lock the support member in the supporting state. The detection component is used to detect the position state of the secondary door. The control component is connected to the detection component and the locking component. In response to the position state of the secondary door detected by the detection component, the control component controls the locking component to unlock the support member, causing the support member to switch from the supporting state to the yielding state. This application uses the detection component to sense the actual position of the secondary door in real time, and the control component issues an unlocking command accordingly. Only after the secondary door is closed to a preset safe position is the main door allowed to close, thus logically and completely guaranteeing the mandatory "secondary door first, then main door" sequence and eliminating the risk of failure due to mechanical jamming.

Description

Technical Field

[0001] This application belongs to the technical field of fire door sequencers, and particularly relates to a fire door sequencer. Background Technology

[0002] Double-leaf fire doors are an important component of building fire compartmentation systems. Their core function is to automatically close in the event of a fire, effectively preventing the spread of fire and smoke. To ensure a mandatory closing sequence of "secondary doors first, then main doors," double-leaf fire doors typically require a door sequencer. Currently, there are three main types of fire door sequencers commonly available on the market: L-shaped sequencers, U-shaped sequencers, and concealed sequencers.

[0003] The 7-shaped sequencer is fixed to the door frame by a base. After the door opens, a spring mechanism opens the support rod, which vertically holds the main door in place. Once the secondary door is closed, the support rod is pressed down, allowing the main door to close. This structure concentrates stress at the base of the support rod, making it prone to deformation and jamming over time. It also requires high precision in installation; door sagging or frame deformation can cause sequence failure. The U-shaped sequencer is similarly fixed to a base, using a spring mechanism to pull down a support rod to support the main door, and unlocking is triggered by a plate fixed to the secondary door. This type of sequencer has poor installation adaptability, strict requirements on door thickness and reserved space, insufficient mechanical durability, and high maintenance costs. The concealed sequencer embeds the linkage components inside the main and secondary doors, using an internal locking mechanism and a return spring to store energy, triggering sequence control when the door closes. This type is complex to install, difficult to maintain, and relatively expensive, with poor compatibility with intelligent monitoring systems and limited environmental adaptability.

[0004] The aforementioned existing technologies all share the following common problems: First, the timing control relies on purely mechanical triggering, which is prone to reversal of the "main door closes first, secondary door closes last" sequence due to spring loosening, mechanism wear, door sagging, or installation angle deviation. It can also lead to "blind angle" conditions when the door opens slowly or stops improperly, causing sequence disorder or even preventing both doors from closing, severely impacting the smoke and fire resistance of the fire doors. Second, reliability is insufficient. Mechanical components are prone to jamming and corrosion under long-term high-frequency opening and closing, vibration, or humid environments. Electromagnetic sequencers rely on external power supply and are prone to failure during power outages or electromagnetic interference. Third, they lack status monitoring and fault warning functions. Whether the sequencer is working properly or has failed depends on regular manual inspections, making it difficult to detect potential hazards in a timely manner and posing a significant risk to fire safety. Furthermore, the installation positions of existing sequencers often conflict with those of door magnets, door closers, and other components. They are difficult to install in scenarios with thin doors or no reserved space, and their exposed structure affects passage and aesthetics.

[0005] Therefore, there is an urgent need to provide a fire door sequencer that can achieve precise forced timing control, has strong installation adaptability, high operational reliability, intelligent monitoring function, and low overall cost. Summary of the Invention

[0006] This application aims to at least partially solve the technical problems of traditional fire door sequencers, such as timing failures, insufficient reliability, and lack of monitoring. Therefore, this application provides a fire door sequencer.

[0007] In a first aspect, embodiments of this application provide a fire door sequencer, comprising: a base, a support member, a locking component, a detection component, and a control component; the support member is movably mounted on the base and has a supporting state for supporting a main door and an abduction state for allowing the main door to pass through; the locking component is mounted on the base and is used to selectively lock the support member in the supporting state; the detection component is used to detect the position state of a secondary door; the control component is connected to the detection component and the locking component, and in response to the position state of the secondary door detected by the detection component, the control component controls the locking component to unlock the support member, causing the support member to switch from the supporting state to the abduction state.

[0008] Optionally, the locking component includes a movable locking member having a locked position that prevents the support member from exiting the supported state, and an unlocked position that allows the support member to switch to an avoidance state.

[0009] Optionally, in response to the detection component detecting that the secondary door has not reached the preset position, the control component controls the locking element to remain in the locked position; in response to detecting that the secondary door has reached the preset position, the control component controls the locking element to switch to the unlocked position.

[0010] Optionally, the support includes a support rod and a fixed rod. One end of the support rod is hinged to the base, and the fixed rod connects the support rod and the base respectively. When the support is in a supported state, the base, the support rod, and the fixed rod together form a stable triangular support structure.

[0011] Optionally, the base is provided with a guide groove, and the end of the fixing rod is slidably engaged in the guide groove; the locking component locks the support in the supported state by restricting the sliding of the end of the fixing rod in the guide groove.

[0012] Optionally, the fire door sequencer also includes an elastic element, which is connected to the base and the support rod respectively, and is used to drive the support rod to rotate outward when the main door is opened, so that the support enters the support state.

[0013] Optionally, the end of the fixed rod is provided with a pulley, which rolls within a guide groove; and / or, the end of the support rod is provided with a rolling element for contacting the main door.

[0014] Optionally, the locking assembly includes an electromagnetic actuator having a locking lever that extends when energized and retracts when de-energized, the locking lever being used to block or release the movement path of the end of the fixed lever.

[0015] Optionally, the electromagnetic actuator has a built-in return spring. When the electromagnetic actuator is de-energized, the return spring drives the locking rod to reset, thereby releasing the end of the fixing rod.

[0016] Optionally, the detection component is a proximity switch or a position sensor, mounted on the base, used to sense whether the secondary door is closed to a critical position that does not interfere with the closing of the main door.

[0017] The beneficial effects of this application are: This technical solution effectively addresses the technical problems of traditional fire door sequencers, such as timing failures, insufficient reliability, and lack of monitoring, and brings the following beneficial effects. First, regarding timing control, traditional purely mechanical sequencers are prone to reversing the order of main door closing before secondary door closing, or causing sequence errors due to "blind spots" formed by incomplete door opening. This solution uses a detection component to sense the actual position of the secondary door in real time, and the control component issues an unlocking command accordingly. Only after the secondary door is closed to a preset safe position is the main door allowed to close, thus logically and thoroughly guaranteeing the mandatory "secondary door first, main door later" sequence. This eliminates the risk of timing failures caused by mechanical jamming, deformation, or installation deviations, ensuring that fire doors can close tightly and effectively perform their smoke and fire prevention functions.

[0018] Secondly, regarding reliability, traditional door sequencers are prone to mechanical failures such as spring loosening and door sagging after long-term use. This solution separates the control logic from the actuator. Even if mechanical components experience some wear or deformation, as long as the detection component can normally sense the secondary door position and the control component can normally issue commands, the sequence function can still be maintained, significantly reducing the dependence on the precision of mechanical installation. Simultaneously, the control and locking components can use low-power electronic components, ensuring basic functions even in emergencies without external power supply through backup batteries or mechanical redundancy, thus improving environmental adaptability and service life.

[0019] Third, in terms of intelligent monitoring and maintenance, since the control and detection components form an electrical circuit, they can easily output status signals (e.g., connect to the fire monitoring system via a fireproof input module), providing real-time feedback on the working status of the sequencer, whether the secondary door is in position, and whether the locking components are unlocked correctly. In the event of a malfunction (such as a faulty detection component or the main door failing to close as expected), the system can promptly issue an alarm, changing the traditional passive mode of relying on manual inspections for sequencers. This achieves proactive maintenance and hazard warning, reducing the safety risks caused by sequencer failure during a fire. Furthermore, this solution has a simple structure, highly versatile components, requires no large-scale modification of existing fire doors, has low installation and maintenance costs, and has broad application prospects. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of the fire door sequencer provided in this application; Figure 2 This is a structural diagram of the fire door sequencer provided in this application in its supporting state, in conjunction with the main door and the auxiliary door respectively; Figure 3 This is a schematic diagram of the fire door sequencer provided in this application in the avoidance state when it is used in conjunction with the main door and the secondary door.

[0022] 10 Base; 11 Guide groove; 20 Support component; 21 Support rod; 22 Fixing rod; 30 Locking assembly; 31 Locking component; 32 Electromagnetic actuator; 40 Detection assembly; 50 Elastic element; 60 Pulley; 70 Rolling element. Detailed Implementation

[0023] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described application is only a part of this application, not all of it. Based on the applications in this application, all other applications obtained by a person skilled in the art without inventive effort are within the scope of protection of this application.

[0024] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more applications. Numerous specific details are provided in the following description to give a full understanding of the application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0025] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities can be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0026] The flowcharts shown in the accompanying drawings are merely illustrative and do not necessarily include all content and operations / steps, nor do they necessarily have to be performed in the described order. For example, some operations / steps can be broken down, while others can be combined or partially combined; therefore, the actual execution order may change depending on the specific circumstances.

[0027] It should also be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such uses of these terms can be interchanged where appropriate so that the application described herein can be implemented in a sequence other than those illustrated or described.

[0028] Please see Figures 1 to 3 , Figure 1 This is a structural schematic diagram of the fire door sequencer provided in this application. Figure 2 This is a structural diagram of the fire door sequencer provided in this application in its supporting state, in conjunction with the main door and the secondary door respectively. Figure 3 This is a schematic diagram of the fire door sequencer provided in this application in the avoidance state when it is used in conjunction with the main door and the secondary door.

[0029] This embodiment provides a fire door sequencer for controlling the automatic closing of double-leaf fire doors in the order of "secondary door first, then main door". The sequencer includes a base 10, a support member 20, a locking assembly 30, a detection assembly 40, and a control assembly. The base 10 serves as the mounting foundation for the entire device and is fixed above the door frame or other suitable location. The support member 20 is movably mounted on the base 10; for example, it can be a rod-shaped member with one end hinged to the base 10. The support member 20 has two working states: a supporting state and a yielding state. In the supporting state, the support member 20 extends outward and abuts against the inside of the main door (the door leaf that closes last), thereby preventing the main door from closing prematurely. In the yielding state, the support member 20 retracts or shifts, no longer obstructing the movement of the main door, allowing the main door to close smoothly.

[0030] The locking component 30 is mounted on the base 10 and its function is to selectively lock the support member 20 in its current state. Specifically, when the support member 20 is in the supported state, the locking component 30 can fix it in that position to prevent the support member 20 from accidentally retracting. The detection component 40 is used to detect the position status of the secondary door (the door leaf that should be closed first) in real time. For example, it can use components such as proximity switches, micro switches, or photoelectric sensors, and is installed in a place that can sense whether the secondary door is closed to a certain preset critical position (for example, the secondary door is closed to a certain angle or distance away from being fully closed, at which point the secondary door no longer interferes with the closing of the main door).

[0031] The control component is electrically connected to both the detection component 40 and the locking component 30. It receives the secondary door position signal from the detection component 40 and issues a command to the locking component 30 based on this signal. In operation, when both the main door and the secondary door are open, the support member 20 automatically enters a supporting state under the drive of the elastic element 50 (such as a tension spring), and the locking component 30 locks it. At this time, the support member 20 abuts against the main door, preventing it from closing. Simultaneously, the detection component 40 continuously monitors the position of the secondary door. When the secondary door begins to close and returns to the preset position sensed by the detection component 40, the detection component 40 sends a positioning signal to the control component. The control component then controls the locking component 30 to unlock, releasing the lock on the support member 20. The support member 20 then switches from the supporting state to the yielding state (e.g., retracting under the push of the secondary door continuing to close or under its own gravity). The main door is no longer obstructed and subsequently closes smoothly under the action of the door closer. Thus, this sequencer determines whether to release the main door by detecting the position of the secondary door, achieving a forced timing sequence of secondary door first, then main door.

[0032] The above technical solution effectively solves the technical problems of traditional fire door sequencers, such as timing failure, insufficient reliability, and lack of monitoring, and brings the following beneficial effects. First, in terms of timing control, traditional purely mechanical sequencers are prone to reversing the order of main door closing before secondary door closing, or causing sequence disorder due to "blind spots" formed by incomplete door opening. This solution uses the detection component 40 to sense the actual position of the secondary door in real time, and the control component issues an unlocking command accordingly. Only after the secondary door is closed to the preset safe position is the main door allowed to close, thus logically and thoroughly guaranteeing the mandatory "secondary door first, main door later" sequence, eliminating the risk of timing failure caused by mechanical jamming, deformation, or installation deviation, ensuring that the fire door can close tightly and effectively perform its smoke and fire prevention function.

[0033] Secondly, regarding reliability, traditional door sequencers are prone to mechanical failures such as spring loosening and door sagging after long-term use. This solution separates the control logic from the actuator. Even if mechanical components experience some wear or deformation, as long as the detection component 40 can normally sense the secondary door position and the control component can normally issue commands, the sequence function can still be maintained, significantly reducing the dependence on the precision of mechanical installation. Simultaneously, the control component and locking component 30 can use low-power electronic components. Even in emergencies without external power, basic functions can be guaranteed through backup batteries or mechanical redundancy, improving environmental adaptability and service life.

[0034] Third, in terms of intelligent monitoring and maintenance, since the control component and the detection component 40 form an electrical circuit, they can easily output status signals (e.g., connect to the fire monitoring system via a fireproof input module) and provide real-time feedback on the working status of the sequencer, whether the secondary door is in position, and whether the locking component 30 is unlocked normally. In the event of a malfunction (such as the detection component 40 failing or the main door failing to close as expected), the system can promptly issue an alarm, changing the passive mode of traditional sequencers relying on manual inspections. This achieves proactive maintenance and hazard warning, reducing the safety risks caused by sequencer failure during a fire. Furthermore, this solution has a simple structure, highly versatile components, requires no large-scale modification of existing fire doors, has low installation and maintenance costs, and has broad application prospects.

[0035] This embodiment further defines the specific structure and control method of the locking component 30. The locking component 30 includes a movable locking member 31, which has two distinct working positions. The first position is the locked position, in which the locking member 31 directly or indirectly blocks the movement path of the support member 20, thereby preventing the support member 20 from exiting the supporting state and ensuring that the support member 20 can continuously press against the main door to prevent it from closing prematurely. The second position is the unlocked position, in which the locking member 31 leaves the movement path of the support member 20 and no longer obstructs it, thereby allowing the support member 20 to switch from the supporting state to the yielding state, so that the main door can close smoothly.

[0036] Furthermore, the movement of the locking element 31 is controlled by the control component based on signals from the detection component 40. Specifically, the detection component 40 continuously monitors the position of the secondary door and transmits signals to the control component in real time. When the control component determines that the secondary door has not yet reached the preset position—for example, the secondary door is still at a large opening angle and has not yet closed to the critical point where it does not interfere with the closing of the main door—the control component sends a command to the locking component 30, causing the locking element 31 to remain in or move to the locked position, maintaining the locking of the support member 20. Conversely, when the control component determines that the secondary door has reached the preset position (e.g., the secondary door has closed to a small angle with the door frame, at which point the secondary door no longer obstructs the closing path of the main door), the control component immediately sends an unlocking command, driving the locking element 31 to switch from the locked position to the unlocked position, releasing the support member 20. Thus, through the real-time judgment of the secondary door's position by the control component, precise and dynamic control of the state of the locking element 31 is achieved.

[0037] The above technical solution effectively solves the technical problems of "inaccurate judgment" and "indecisive execution" in traditional sequencers in timing control, and achieves precise timing control based on the actual position of the secondary door. Traditional purely mechanical sequencers often rely on physical collision or compression after the secondary door is in position to trigger unlocking. This passive triggering method is prone to inaccurate triggering timing due to door aging, deformation, or installation deviation, and may even result in the main door being released before the secondary door is fully in position. This solution actively receives detection signals and performs logical judgment through the control component. Only when the secondary door has accurately reached the preset safe position is the locking component 31 commanded to perform the unlocking action, thereby avoiding false triggering or delayed triggering, ensuring the absolute reliability of the "secondary door first, main door later" timing sequence, and eliminating the hidden danger of smoke and fire leakage caused by reversed timing.

[0038] This enhances the system's adaptability to abnormal operating conditions. Because the control component can be flexibly set with threshold values ​​for "preset positions" (e.g., adjustable based on different door sizes, door closer speeds, etc.), even if the closing speed of the secondary door fluctuates in actual application, the control component can accurately issue commands when the set threshold is reached, without relying on the physical contact precision of the mechanical structure. This allows the sequencer to adapt to fire doors of different specifications and brands, reducing the difficulty of on-site installation and commissioning.

[0039] This embodiment further defines the specific structure of the support member 20 and its cooperation relationship with the base 10 and the locking assembly 30. The support member 20 includes a support rod 21 and a fixing rod 22. One end (e.g., the lower end) of the support rod 21 is hinged to the base 10, allowing the support rod 21 to rotate relative to the base 10 within a certain angle range. The fixing rod 22 connects the support rod 21 and the base 10. Specifically, one end of the fixing rod 22 is movably connected (e.g., hinged) to the middle part or the other end of the support rod 21, while the other end of the fixing rod 22 forms a slidable fit with the base 10. When the sequencer is in the working state and the support member 20 is locked in the supported state, the base 10 serves as one side of a triangle, the support rod 21 as the second side, and the fixing rod 22 as the third side, together forming a geometrically stable triangular support structure. This triangular structure can transmit the pressure applied by the main door to the end of the support rod 21 to the base 10 through the fixing rod 22, thereby stably bearing the load without easily deforming or collapsing.

[0040] To enable the support member 20 to switch between a supporting state and an avoidance state, this embodiment further provides a guide groove 11 on the base 10, and the end of the fixing rod 22 (i.e., the end that cooperates with the base 10) is slidably accommodated in the guide groove 11. When the end of the fixing rod 22 is at a specific position (such as the farthest end) in the groove, the triangular structure is formed, and the support member 20 is in the supporting state; when the end of the fixing rod 22 slides to the other end of the groove, the triangular structure is destroyed, and the support member 20 switches to the avoidance state.

[0041] Based on this, the locking component 30 is designed to lock the supported state by restricting the sliding of the end of the fixing rod 22 within the guide groove 11. Specifically, the locking component 30 may include an extendable or retractable locking element (such as the core of an electromagnet or an electric push rod). When the locking element extends, it blocks the path of the end of the fixing rod 22 as it retracts along the groove, preventing the end of the fixing rod 22 from moving in the unlocking direction, thereby locking the triangular structure in a stable state. When the locking element retracts, the obstruction is removed, the end of the fixing rod 22 gains space to slide freely, and the support member 20 is able to exit the supported state.

[0042] The above technical solution effectively solves the technical problem of poor reliability caused by unreasonable structural stress and easy deformation and jamming in traditional sequencers. It improves the structural strength and anti-interference capability of the support component 20. Traditional 7-shaped or U-shaped sequencers often use cantilever beam support structures, with a single stress point. After long-term use, they are prone to bending deformation due to metal fatigue, door sagging, or external impact, leading to support failure. This solution uses a closed triangular support structure composed of a base 10, support rod 21, and fixing rod 22. Utilizing the geometric indeformability of triangles, the load applied by the main door is distributed and transferred to the base 10, greatly improving the rigidity and load-bearing capacity of the support component 20. Even under conditions of heavy door panels, fast closing speeds, or long-term high-frequency opening and closing, the triangular structure remains stable and is not prone to deformation or jamming, effectively extending the service life of the sequencer.

[0043] This design achieves deep integration of the locking mechanism and the support structure, reducing the requirements for manufacturing and assembly precision. Traditional sequencers often rely on friction or snap-fit ​​between the spring mechanism and the strut, which is very sensitive to the machining accuracy and installation position of the components. Even a slight deviation can cause the sequencer to fail.

[0044] This solution places the locking component 30 at the sliding engagement point between the end of the fixed rod 22 and the guide groove 11. The locking component 30 only needs to restrict one linear degree of freedom of the end of the fixed rod 22 within the groove to lock the entire triangular structure. The locking action is clear and highly reliable, and it is insensitive to the installation position errors of other components on the base 10, thus significantly reducing the difficulty of manufacturing and on-site installation and debugging. This "sliding-blocking" locking mechanism has a simple structure and rapid response. Its cooperation with the control component does not require a complex transmission mechanism, which reduces costs and facilitates the integration of status sensors to achieve real-time monitoring and feedback of the locking status, further improving the intelligent operation and maintenance level of the sequencer.

[0045] This embodiment further includes an elastic element 50 for the sequencer, which is connected to both the base 10 and the support rod 21. The elastic element 50 can be a tension spring, torsion spring, spiral spring, or other element capable of storing and releasing elastic potential energy. One end of the elastic element 50 is fixed to the base 10, and the other end is connected to a suitable position on the support rod 21 (e.g., the end of the support rod 21 or near the hinge end). When both the main door and the secondary door are open, the support rod 21, under the action of an external force (such as the push when the door is pushed open), overcomes the elastic force of the elastic element 50 and retracts inward or remains at a certain angle. When the main door is released (e.g., the electromagnetic lock is de-energized or released after being manually opened), the external force of the door on the support rod 21 disappears. At this time, the elastic potential energy stored in the elastic element 50 is released, and the tension or torsional force generated during its recovery deformation drives the support rod 21 to rotate outward around its hinge point with the base 10.

[0046] The term "outward rotation" refers to the support rod 21 swinging from its retracted position near the base 10 toward the main door until its end abuts against the inner side of the main door or a predetermined support position. Thus, the support rod 21 can actively and quickly enter a supporting state, providing obstruction to the main door, without relying on any other external power (such as gravity, the pushing force of the door leaf, etc.). This process can be completed in the initial stage as the main door begins to close, ensuring that the support member 20 is in place and locked before the main door generates significant closing momentum, thereby effectively preventing the main door from closing prematurely.

[0047] The above technical solution effectively solves the technical problems of "inadequate support" or "inability to enter the support state" that occur in traditional sequencers when the door opening angle is small or the positioning after opening is inaccurate. It ensures reliable activation of the support component 20 under various door opening conditions. Traditional sequencers sometimes rely on the weight of the support rod 21 itself or the friction of the door opening to unfold the support rod 21. However, when the door opens slowly, the opening angle is insufficient, or the door body ages and resistance increases, the support rod 21 may not be able to fully unfold to the effective support position, creating a "blind angle" condition, causing the sequencer to fail. This solution actively provides driving force through the elastic element 50. Regardless of the door's speed or opening angle, as long as the door no longer presses against the support rod 21, the elastic element 50 can immediately drive the support rod 21 to rotate outward to the predetermined position, eliminating the dependence of the support component 20's unfolding on the door's opening angle or speed, and significantly improving the sequencer's environmental adaptability and activation reliability.

[0048] This embodiment further optimizes the motion coordination and contact method of the sequencer. A pulley 60 is provided at the end of the fixed rod 22, which rolls within the guide groove 11 on the base 10. The pulley 60 can be mounted to the end of the fixed rod 22 via a pin or bearing, allowing it to roll freely within the groove, thus converting the original sliding friction into rolling friction. Simultaneously, a rolling element 70 is provided at the end of the support rod 21 (i.e., the free end used to abut the main door). This rolling element 70 can be a roller, ball bearing, or a cylinder covered with a low-friction material, etc., for direct contact with the inner surface of the main door.

[0049] When the main door abuts against the end of the support rod 21 during closing, the rolling element 70 forms a rolling contact with the main door surface instead of a sliding contact. These two rolling structures can be set independently or simultaneously: that is, the end of the fixed rod 22 uses a pulley 60 in rolling engagement with a groove, while the end of the support rod 21 also uses a rolling element 70 to contact the door leaf; or only one of them can be used. Regardless of the method used, the core principle is to replace sliding friction in key moving parts with rolling friction, thereby reducing motion resistance and wear.

[0050] The above technical solution effectively solves the technical problems of traditional sequencers, such as high frictional resistance, easy jamming, and wear, leading to unsmooth operation and reduced reliability. It significantly reduces frictional resistance during sequencer operation, ensuring sensitive and reliable operation. In traditional sequencers, the end of the fixed rod 22 and the slide groove are mostly in a sliding fit. After long-term use, due to dust accumulation, metal surface oxidation, or lubrication failure, the sliding resistance increases significantly, even causing jamming. This prevents the fixed rod 22 from sliding smoothly, the support component 20 from properly exiting the support state, and ultimately prevents the main door from closing. This solution sets a pulley 60 at the end of the fixed rod 22, changing sliding friction to rolling friction. The frictional force can typically be reduced by more than an order of magnitude. Even without maintenance or in harsh environments, the pulley 60 can roll flexibly within the slide groove, ensuring smooth execution of locking and unlocking actions.

[0051] This effectively reduces wear on key components and extends the service life of the sequencer. Repeated friction from the sliding fit causes wear on the inner wall of the groove and the end of the fixed rod 22. Increased wear leads to larger gaps, affecting not only motion accuracy but also potential locking failure. The rolling fit between the pulley 60 and the groove produces almost no wear debris, resulting in low contact stress and significantly improved wear resistance. This allows the sequencer to withstand hundreds of thousands of opening and closing cycles without failure, making it particularly suitable for high-traffic areas with frequent fire door opening and closing (such as shopping malls and hospital corridors), and unsuitable for locations where normally open fire doors are not recommended.

[0052] This embodiment further defines the specific implementation of the locking component 30. The locking component 30 includes an electromagnetic actuator 32 with a retractable locking rod. The extension or retraction of the locking rod is controlled by the state of the electromagnetic actuator 32: in one design, the locking rod extends to block when energized and retracts to release when de-energized. Its core function is to selectively occupy or allow the sliding path of the end of the fixing rod 22 within the guide groove 11 through the displacement of the locking rod, thereby achieving locking or unlocking.

[0053] Furthermore, the electromagnetic actuator 32 integrates a return spring. The direction of the spring force of this return spring is opposite to the direction of the magnetic force generated when the electromagnet is energized. Taking the most common logic of "power off retraction, power on extension blocking" as an example: when the control component determines that the secondary door has not yet reached the preset position, the electromagnetic actuator 32 remains energized, the locking rod remains extended under the action of the return spring, the end of the blocking fixing rod 22 retracts, and the support member 20 is locked in the supporting state; when the secondary door reaches the preset position, the control component de-energizes the electromagnetic actuator 32, the electromagnetic force overcomes the spring force of the return spring and pulls the locking rod into the retracted state, the end of the fixing rod 22 gains free sliding space, and the support member 20 switches to the avoidance state; after energization, the return spring pushes the locking rod out again, preparing for the next locking.

[0054] The above technical solution effectively solves the technical problems of slow response, high power consumption, power failure, and mechanical jamming in the locking execution stage of traditional sequencers. As an electromechanical conversion element, the electromagnetic actuator 32's locking lever action time after being energized is typically in the millisecond range (typically 20ms-50ms), far faster than micro-motors or pneumatic components. This ensures that the main door unlocks immediately upon the secondary door reaching the preset position, preventing the main door from being excessively obstructed and unable to close due to unlocking delays. Furthermore, the electromagnetic actuator 32 only needs to be energized during state switching (the state can be maintained by mechanical self-locking or a return spring), resulting in extremely low average power consumption. This facilitates the use of batteries or fire backup power supplies, and even if the main power supply fails, it can maintain normal operation for a period of time, improving the system's power supply compatibility and emergency reliability.

[0055] This embodiment further defines the specific type and installation purpose of the detection component 40. The detection component 40 can be a proximity switch or a position sensor, and is mounted on the base 10. The proximity switch can be an inductive, capacitive, or magnetic induction proximity switch, which can detect whether the secondary door has approached to a set distance without physical contact with the secondary door; the position sensor can be a micro switch, photoelectric sensor, or Hall sensor, etc., which can accurately detect the position status of the secondary door through contact or non-contact methods. This detection component 40 is specifically used to sense whether the secondary door has been closed to a critical critical position—the so-called critical position refers to the situation where, during the closing process, when the angle or distance between the secondary door and the door frame decreases to a certain threshold, continued closing will no longer interfere with the closing path of the main door.

[0056] In other words, once the secondary door crosses this critical position, even if the main door begins to close, it will not collide with the secondary door, and both doors can close tightly in sequence, forming an effective fireproof and smoke-proof seal. The detection component 40 converts whether the secondary door has reached this critical position into an electrical signal (such as a switching quantity or an analog quantity) and transmits it to the control component in real time. The control component can then accurately determine the timing for unlocking the main door based on this signal.

[0057] The above technical solution effectively solves the technical problems of "inaccurate detection," "unreliable signal," and "poor installation adaptability" in traditional sequencers for detecting the position of secondary doors. It provides a non-contact, wear-free position detection method, significantly improving the reliability and lifespan of the detection. Traditional purely mechanical sequencers rely on the physical collision of the secondary door after it reaches its position to trigger the unlocking mechanism. After long-term use, the collision points are prone to wear and deformation, leading to misalignment of the triggering timing or even failure. This solution uses proximity switches or position sensors, especially non-contact proximity switches, which can sense the position of the secondary door without any mechanical contact, completely eliminating the risks of mechanical wear and jamming. The detection accuracy is not affected by stains on the door surface, slight deformation, or loose installation, and it can operate stably for hundreds of thousands of cycles.

[0058] It achieves precise adjustment of the critical position, adapting to different door specifications and installation environments. Different fire doors have different widths, door closer speeds, and sealing requirements, so the ideal unlocking critical position may also vary. Using position sensors (such as proximity switches with adjustable thresholds or microswitches with installation position adjustment slots), the sensing distance or trigger angle of the detection component 40 can be flexibly set during on-site installation, thereby precisely matching the actual working conditions and ensuring that the secondary door sends an unlocking signal at the optimal moment that "just does not interfere with the closing of the main door." This avoids timing problems caused by unlocking too early (causing the main door to close prematurely and collide with the secondary door) or unlocking too late (causing the main door to be blocked and unable to close for an extended period), improving the sequencer's universal adaptability to different brands and models of fire doors.

[0059] In the description of this specification, the references to terms such as "an application," "some applications," "example," "specific example," or "some examples," etc., mean that a specific feature, structure, material, or characteristic described in connection with that application or example is included in at least one application or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same application or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more applications or examples. Moreover, those skilled in the art can combine and integrate the different applications or examples described in this specification.

[0060] Furthermore, the technical solutions of each application can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0061] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A fire door sequencer for controlling double-leaf fire doors to close in a preset sequence, characterized in that, The fire door sequencer includes: Base; The support member is movably mounted on the base and has a supporting state for supporting the main door and a yielding state that allows the main door to pass through. A locking component, mounted on the base, is used to selectively lock the support member in the supported state; The detection component is used to detect the position status of the secondary door; A control component, connected to the detection component and the locking component, responds to the position state of the secondary door detected by the detection component, and controls the locking component to unlock the support member, so that the support member switches from the supporting state to the avoidance state.

2. The fire door sequencer according to claim 1, characterized in that, The locking component includes a movable locking member having a locked position that prevents the support member from exiting the supported state, and an unlocked position that allows the support member to switch to the avoidance state.

3. The fire door sequencer according to claim 2, characterized in that, The control component controls the locking member to remain in the locked position in response to the detection component detecting that the secondary door has not reached the preset position; and controls the locking member to switch to the unlocked position in response to detecting that the secondary door has reached the preset position.

4. The fire door sequencer according to claim 1, characterized in that, The support member includes a support rod and a fixing rod. One end of the support rod is hinged to the base, and the fixing rod connects the support rod and the base respectively. When the support member is in a supported state, the base, the support rod, and the fixing rod together form a stable triangular support structure.

5. The fire door sequencer according to claim 4, characterized in that, The base is provided with a guide groove, and the end of the fixing rod is slidably engaged in the guide groove; the locking component locks the support in the supported state by restricting the sliding of the end of the fixing rod in the guide groove.

6. The fire door sequencer according to claim 5, characterized in that, The fire door sequencer also includes an elastic element, which is connected to the base and the support rod respectively, and is used to drive the support rod to rotate outward when the main door is opened, so that the support enters the support state.

7. The fire door sequencer according to claim 5, characterized in that, The fixed rod is provided with a pulley at its end, and the pulley is rolled in the guide groove; and / or, the support rod is provided with a rolling element for contacting the main door at its end.

8. The fire door sequencer according to claim 5, characterized in that, The locking assembly includes an electromagnetic actuator having a locking lever that extends when energized and retracts when de-energized, the locking lever being used to block or release the movement path of the end of the fixing rod.

9. The fire door sequencer according to claim 8, characterized in that, The electromagnetic actuator has a built-in return spring. When the electromagnetic actuator is de-energized, the return spring drives the locking rod to reset, thereby releasing the end of the fixing rod.

10. The fire door sequencer according to claim 1, characterized in that, The detection component is a proximity switch or a position sensor, installed on the base, used to sense whether the secondary door is closed to a critical position that does not interfere with the closing of the main door.

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