Normally-closed fireproof door state detection device

Abstract

The invention relates to the technical field of normally-closed fireproof doors, in particular to a normally-closed fireproof door state detection device which is applied to a fireproof door and comprises a permanent magnet, a shell, a rotating assembly, a sensor, a spring, a sliding piece, an adjusting assembly and a communicating piece. The sensor is connected to the lower end of the rotating assembly, the springs are connected to the left side and the right side of an inner cavity of the shell, the sliding pieces are connected to the upper ends of the springs, the adjusting assemblies are connected to the left side and the right side of the shell, and the communicating pieces are connected to the sides, close to the sensor, of the adjusting assemblies. According to the fireproof door state detection device, the fixed sensor is changed into the movable sensor, when the magnetic field of the permanent magnet acts on the sensor, the rotation of the sensor is kept horizontal with the permanent magnet, secondary detection is formed through the rotation of the sensor, and then the purpose of accurately detecting the state of the fireproof door is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of normally-closed fire doors, and particularly to a state detection device for a normally-closed fire door. Background Art

[0002] A normally-closed fire door is a safety facility used for fire prevention and smoke isolation in a building. The normally-closed fire door is in a closed state under normal circumstances and will only be opened when people pass through, and then it will automatically close. In order to ensure that the fire door is in the normally-closed state, security personnel will use a state detection device to detect the opening and closing state of the fire door. When the normally-closed fire door is abnormally opened, the state detection device notifies the security personnel to repair the fire door in time. The door magnetic switch is a commonly used state detection sensor.

[0003] The working principle of the door magnetic switch is as follows: A permanent magnet is installed on the fire door, and the sensor is installed on the door frame. A reed switch is installed inside the sensor. When the door is closed, the magnetic force of the permanent magnet magnetizes the reed switch, thereby making the reed switch energized. When the door is opened, the permanent magnet moves away from the reed switch, and the reed switch is demagnetized, thereby turning off the power of the reed switch. By the magnetization effect of the permanent magnet on the reed switch, the energized state is controlled to determine whether the door is in the closed state. Due to the difference in the individual magnetic force intensity of the permanent magnets during the production process, in order to ensure that the sensor can be stably triggered after the door is closed, the position of the permanent magnet after the door is closed is set to a minimum trigger distance Smin, and a maximum trigger distance Smax is set before the door is closed (such as Figure 1As shown, the distance between the maximum trigger distance Smax and the minimum trigger distance Smin is T. That is, when the door rotates at an angle a and the permanent magnet enters the range between the maximum trigger distance Smax and the minimum trigger distance Smin, the sensor will be triggered at a certain operating point when the permanent magnet moves between the minimum trigger distance Smin and the maximum trigger distance Smax, indicating that the door is closed. In some high-rise commercial buildings, in the morning when people on the lower floors go to work and want to avoid waiting for the elevator, some people will go upstairs through the corridor. Although the fire doors in the corridor can close automatically, after long-term use of the fire doors, the thrust of the automatic door closer on the door decreases, resulting in the door not closing completely and being in a half-closed state. At this time, the permanent magnet has moved between the minimum trigger distance Smin and the maximum trigger distance Smax, and the door magnetic switch shows that the door is closed, which leads to inaccurate detection of the state of the fire door. Moreover, because the closing gap is small, it is not easy to notice when people pass by. When a danger occurs, thick smoke is likely to seep out from the gap of the fire door that is not completely closed, affecting the safety of people's lives. To address the above problems, some solutions have been proposed in the prior art. For example, the reed switch is replaced with a more expensive Hall switch. By utilizing the characteristic that the Hall switch has a strong magnetic induction to the positive magnetic force and a weak magnetic induction to the side magnetic force, it is achieved that the sensor will only sense when the permanent magnet is directly below the sensor. However, during installation, due to the different models of the doors, the gaps between the front of the door and the front of the door frame are different. In order to adapt to different models of fire doors, the manufacturer designs the width of the permanent magnet to be larger, so as to ensure that the permanent magnet is located below the sensor after the door is closed. However, the larger permanent magnet will move below the sensor before the door is closed, resulting in the sensor indicating that the door has been closed first, and thus the door magnetic switch's detection of the fire door is inaccurate.

[0004] Therefore, a normally closed fire door state detection device is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a normally closed fire door state detection device, which solves the problem that when the permanent magnet moves between the minimum trigger distance Smin and the maximum trigger distance Smax, the triggering of the permanent magnet on the sensor precedes the complete closing of the door, and the fire door is detected as being in a closed state when it is actually ajar, resulting in inaccurate detection of the fire door. By changing the fixedly arranged sensor to a movably arranged one, when the magnetic field of the permanent magnet acts on the sensor, the sensor rotates to be horizontal with the permanent magnet, and a secondary detection is formed through the rotation of the sensor, thereby achieving the purpose of accurate detection of the state of the fire door.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A normally closed fire door status detection device is applied to a fire door. The fire door includes a door frame, a door body and a sealing strip. The status detection device includes a permanent magnet and a housing. The permanent magnet is installed on the door body, and the housing is installed on the door frame. The status detection device further includes a rotating assembly, a sensor, a spring, a sliding member, an adjusting assembly and a connecting member. The rotating assembly is connected inside the housing cavity. The sensor is connected to the lower end of the rotating assembly. The spring is connected to the left and right sides inside the housing cavity. The sliding member is connected to the upper end of the spring. The adjusting assembly is connected to the left and right sides of the housing. The connecting member is connected to the side of the adjusting assembly close to the sensor. When the door body is ajar, the permanent magnet generates a magnetic adsorption force on the sliding member, causing the sliding member to move downward. When the sliding member moves downward, the adjusting assembly drives the connecting member to move upward and separate from the sensor. When the sliding member moves downward to a specified position, the locking of the sensor is released. The rotating assembly is affected by the magnetic force of the permanent magnet and drives the sensor to rotate away from directly below the connecting member. When the door body is closed, the magnetic force of the permanent magnet pulls the sensor back to be connected to the connecting member.

[0008] Through the above solution, the sensor is connected to the rotating assembly, enabling the sensor to rotate. Thus, when the door body is ajar, the magnetic force of the permanent magnet causes the sliding member to move downward and release the locking of the sensor. The sensor rotates and thus deviates from the connecting member. Then, when the inside of the sensor is connected, whether the outside of the sensor is disconnected is determined according to the angle of the sensor. The induction inside the sensor and the rotation of the sensor form a double-layer detection, effectively improving the accuracy of detecting the opening and closing of the fire door.

[0009] Preferably, the rotating assembly includes a rotating shaft, a limiting member, a rotating plate, a clamping plate and a counterweight. The rotating shaft is rotatably connected to the upper side inside the housing cavity. The limiting member, the rotating plate and the clamping plate are sequentially connected to the outer periphery of the rotating shaft from top to bottom. The lower side of the clamping plate is connected to the sensor. The two counterweights are respectively connected to the left and right sides of the lower surface of the sensor. An inflation assembly is connected between the sliding member and the adjusting assembly.

[0010] Through the above solution, the rotating shaft is rotatably connected to the housing, enabling the sensor to rotate. On the one hand, through the magnetic induction effect between the permanent magnet and the counterweight, the sensor is kept parallel to the permanent magnet. Then, through the angle between the connecting member and the sensor, a secondary detection is formed, effectively improving the detection accuracy. On the other hand, when the sensor rotates due to the impact generated by closing the door, through the rotating setting, the sensor can swing adaptively to reduce the impact force on the sensor. The counterweights are connected to the left and right sides of the lower surface of the sensor, and thus the swinging amplitude of the sensor is reduced by gravity.

[0011] Preferably, the limiting member includes a limiting ring, a limiting groove and a limiting piece. The limiting ring is connected to the upper side of the inner cavity of the housing and is coaxially arranged with the rotating shaft. The limiting groove is provided with the limiting ring. The limiting pieces are connected to both sides of the rotating shaft. The limiting pieces are arc-shaped and made of elastic metal. The transverse section of the limiting groove is olive-shaped. The limiting pieces are in contact with the limiting groove when rotating.

[0012] Through the above solution, the limiting piece is in contact with the limiting groove when rotating, and the limiting piece is arc-shaped and made of elastic metal. Therefore, when the rotating shaft drives the limiting piece to rotate, on the one hand, the setting of the limiting piece limits the maximum rotation angle of the sensor and avoids the sensor contacting the housing. On the other hand, when the impact of closing the door causes the sensor to swing, it can buffer the rotation amplitude of the sensor.

[0013] Preferably, an air groove is opened at the rear end of the top of the sealing strip. The inflation assembly includes a conduit, an expansion airbag, a partition board, a buffer airbag and a through hole. One end of the conduit is communicated with the air groove. The expansion airbag is connected to the other end of the conduit. The partition board and the buffer airbag are sequentially connected to the side of the expansion airbag close to the sensor. The partition board is provided with a through hole on its surface. The diameter value of the through hole is smaller than the inner diameter value of the conduit. The front end of the expansion airbag is connected to the sliding member.

[0014] Through the above solution, when closing the door quickly, the expansion airbag can push the sliding member away, thereby giving the sensor a swinging space. The diameter value of the through hole is smaller than the inner diameter value of the conduit. Therefore, the expansion speed of the buffer airbag is slower. In the initial expansion stage, it can give the sensor a swinging space to facilitate the sensor to unload force. As the buffer airbag expands, the buffer airbag will gradually limit the sensor, thereby ensuring the fitting of the sensor and the connecting member, and thus ensuring the accuracy of detection.

[0015] Preferably, the sliding member includes a bottom plate, a slider and a clamping block. The bottom plate is connected to the upper end of the spring. The slider is connected to the upper side of the bottom plate. A chamfer is provided on the left side of the top of the slider. The clamping block is connected to the top of the slider on the side away from the chamfer.

[0016] Through the above solution, a chamfer is provided on the top of the slider, which facilitates the upward movement of the slider and reduces the resistance of the sensor when the slider moves upward.

[0017] Preferably, the adjusting assembly includes a frame, a long rack, a gear, a short rack and a force-bearing member. The frame is connected to the inner cavity of the housing. The long rack is connected to the inner cavity of the frame. The gear is meshed and connected to the side of the long rack close to the sensor. The short rack is meshed and connected to the side of the gear close to the sensor. The force-bearing member is connected to the long rack. The connecting member is connected to the short rack. The weight of the short rack is greater than the weight of the long rack.

[0018] Through the above solution, the gravity value of the short rack is greater than that of the long rack. Therefore, when the long rack is not stressed, the heavier gravity of the short rack will cause it to move downward, thereby driving the connecting member to move downward and approach the sensor, facilitating the quick connection of the sensor after the door is manually closed, and thus improving the detection efficiency.

[0019] Preferably, the force-bearing member includes a guide groove, a guide plate, a sliding plate, a sliding groove, and a spring piece. The guide groove is opened in the inner cavity of the frame, the guide plate is slidably connected in the guide groove, the sliding plate is connected to the guide plate, the surface of the long rack is provided with a sliding groove, the spring piece is connected to the side of the sliding plate close to the sensor, and the top of the spring piece is wavy.

[0020] Through the above solution, the top of the spring piece is wavy, so that when the spring piece contacts the lower end of the clamping block, it is a multi-point contact, thereby reducing the friction between the spring piece and the clamping block when the spring piece moves horizontally.

[0021] Preferably, the sliding groove includes an m section and an n section. The m section is located above the n section. The m section is vertical, and the n section is inclined.

[0022] Through the above solution, the m section is vertical, which can ensure the position of the spring piece at the lower end of the clamping block, facilitating the stable transmission of the power of the clamping block to the spring piece. The n section is inclined, facilitating the separation of the spring piece from the clamping block.

[0023] Preferably, the connecting member includes a connecting plate and a connecting piece. The connecting plate is connected to the upper end of the short rack, the connecting piece is connected to the lower side of one end of the connecting plate. When the rotating plate does not fit with the connecting piece, the included angle between the connecting piece and the connecting plate is an obtuse angle, and the end of the rotating plate away from the rotating shaft is arc-shaped.

[0024] Through the above solution, the included angle between the connecting piece and the connecting plate is an obtuse angle, which further increases the distance between the connecting piece and the sensor contact, avoiding the mis-triggering of the sensor. The end of the rotating plate away from the rotating shaft is arc-shaped, which reduces the friction between the rotating plate and the connecting piece when the rotating plate rotates.

[0025] Preferably, the distance from the side of the upper end of the spring piece close to the sensor to the long rack is x, and the top view projection distance of the n section is greater than x.

[0026] Through the above solution, when the guide plate slides on the n section, it can stably drive the spring piece to separate from the clamping block.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. The present invention solves the problem of inaccurate detection of the ajar state of the fire door caused by the permanent magnet triggering the sensor before the door is fully closed when the permanent magnet moves between the minimum triggering distance Smin and the maximum triggering distance Smax. By setting a connecting member that acts as a second contact outside the sensor and making the straight line formed by the two connecting members parallel to the door frame, when the door is ajar, the magnetic force of the permanent magnet drives the sliding member to move downward to release the limit on the sensor, and the rotating assembly drives the sensor to rotate parallel to the door body. Through the angle between the door body and the door frame, an angle is formed between the sensor and the connecting member, thereby controlling the disconnection of the secondary contact, effectively improving the accuracy of door body detection.

[0029] 2. By setting an inflation assembly, when closing the door, the gas in the air groove is squeezed by the door body, causing the gas to expand the expansion airbag. After the expansion airbag expands, the gas will flow into the buffer airbag through the through hole, thereby causing the buffer airbag to expand. The expansion of the buffer airbag can fix the sensor, stabilize the angle of the sensor after the door is closed, ensure the stable connection of the secondary contact, and effectively improve the effect of door body opening and closing detection.

[0030] 3. By setting an adjustment assembly, when the door is ajar, the permanent magnet drives the elastic piece to move downward through the bottom plate, slider and block. When the elastic piece moves downward, it slides along the guide groove through the sliding plate and the guide plate. The n-section of the guide groove is inclined. Therefore, when the guide plate slides in the guide groove, it drives the elastic piece to separate from the lower side of the block, causing the long rack to lose the downward pulling force, while the short rack has a greater weight and will move downward actively, thereby driving the connecting member to move downward close to the sensor contact. Then, after the door is fully closed, the connecting member can quickly fit with the sensor, thereby improving the connection efficiency of the secondary contact of the sensor and effectively improving the effect of door body opening and closing detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a display diagram of the closed door state of the prior art;

[0032] Figure 2 It is a schematic structural diagram after the installation of the present invention;

[0033] Figure 3 It is a schematic structural diagram of the whole of the present invention;

[0034] Figure 4 It is a schematic structural diagram of the rotating assembly part of the present invention;

[0035] Figure 5 It is a schematic structural diagram of the inflation assembly part of the present invention;

[0036] Figure 6 It is a schematic structural diagram of the adjustment assembly part of the present invention;

[0037] Figure 7Schematic diagram of the structure of the force-bearing part of the present invention;

[0038] Figure 8 Schematic diagram of the open state of the door of the present invention;

[0039] Figure 9 Schematic diagram of the closed state of the door of the present invention;

[0040] Figure 10 Schematic diagram of the state when the door body of the present invention is ajar.

[0041] In the figure: 1, fire door; 101, door frame; 102, door body; 103, sealing strip; 1031, air groove; 2, permanent magnet; 3, outer shell; 4, rotating assembly; 401, rotating shaft; 402, limiting part; 4021, limiting ring; 4022, limiting groove; 4023, limiting piece; 403, rotating plate; 404, clamping plate; 405, counterweight; 5, sensor; 6, spring; 7, sliding part; 701, bottom plate; 702, sliding block; 703, clamping block; 8, adjusting assembly; 801, frame; 802, long rack; 803, gear; 804, short rack; 805, force-bearing part; 8051, guide groove; 8052, guide plate; 8053, sliding plate; 8054, sliding groove; 8055, elastic piece; 9, connecting part; 901, connecting plate; 902, connecting piece; 10, inflating assembly; 1001, conduit; 1002, expansion airbag; 1003, partition plate; 1004, buffer airbag; 1005, through hole. Detailed implementation manners

[0042] Next, with reference to the accompanying drawings of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described, making its working state and structural features more detailed. Obviously, the described embodiments are only partial embodiments of the present invention, not complete embodiments. Based on the embodiments of the present invention, other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

[0043] Please refer to Figures 1 to 10 , the present invention provides a normally closed fire door state detection device, and the technical solution is as follows:

[0044] Specifically, refer to Figures 1 to 10, A normally closed fire door status detection device, the status detection device is applied to a fire door 1, the fire door 1 includes a door frame 101, a door body 102 and a sealing strip 103, the door body 102 is connected to the door frame 101 through a hinge, the sealing strip 103 is attached to the door frame 101, after the door body 102 and the door frame 101 are closed, the sealing strip 103 is attached to the door body 102, separating the front and back sides of the fire door 1, thereby achieving smoke isolation and fire interruption. The status detection device includes a permanent magnet 2 and a housing 3. The permanent magnet 2 is installed on the door body 102, and the permanent magnet 2 is installed on the side of the top of the door body 102 away from the hinge, and the permanent magnet 2 is fixedly installed. The housing 3 is installed in the middle of the front end face of the door frame 101, and the number of the housing 3 is two. The status detection device further includes a rotating assembly 4, a sensor 5, a spring 6, a sliding member 7, an adjusting assembly 8, a connecting member 9 and an inflating assembly 10. The rotating assembly 4 is connected to the inner cavity of the housing 3, the sensor 5 is connected to the lower end of the rotating assembly 4, the sensing member in the sensor 5 is a Hall switch, and the sensitive surface of the Hall switch is directly below. The spring 6 is connected to the left and right sides of the inner cavity of the housing 3, the sliding member 7 is connected to the upper end of the spring 6, the adjusting assembly 8 is connected to the left and right sides of the housing 3, the connecting member 9 is connected to the side of the adjusting assembly 8 close to the sensor 5, and the inflating assembly 10 is arranged between the sliding member 7 and the adjusting assembly 8. When the door body 102 is ajar, the permanent magnet 2 generates a magnetic attraction force on the sliding member 7, causing the sliding member 7 to move downward. When the sliding member 7 moves downward, the adjusting assembly 8 drives the connecting member 9 to move upward and separate from the sensor 5. When the sliding member 7 moves downward to a specified position, the locking of the sensor 5 is released. The rotating assembly 4 is affected by the magnetic force of the permanent magnet 2 and drives the sensor 5 to rotate and deviate from directly below the connecting member 9. When the door body 102 is closed, the magnetic force of the permanent magnet 2 pulls the sensor 5 to reset and communicate with the connecting member 9.

[0045] By setting the rotating assembly 4 and connecting the sensor 5 to the rotating assembly 4, the sensor 5 can rotate. Thus, when the permanent magnet 2 remains in an inclined state for a long time, the magnetic force of the permanent magnet 2 causes the sliding member 7 to move downward to release the locking of the sensor 5, and the sensor 5 can rotate and deviate from the connecting member 9. Then, when the inside of the sensor 5 is connected, whether it is disconnected is determined according to the angle of the sensor 5 outside. The induction inside the sensor 5 and the rotation of the sensor 5 form a double-layer detection, thereby effectively improving the accuracy of detecting the opening and closing of the fire door 1.

[0046] As an implementation manner of the present invention, refer to Figure 3 , Figure 4 , Figure 8 , Figure 9 and Figure 10, the rotating assembly 4 includes a rotating shaft 401, a limiting member 402, a rotating plate 403, a clamping plate 404 and a counterweight 405. The rotating shaft 401 is rotatably connected to the upper side of the inner cavity of the housing 3. The limiting member 402, the rotating plate 403 and the clamping plate 404 are sequentially connected to the outer periphery of the rotating shaft 401 from top to bottom. When the rotating shaft 401 rotates, it can drive the rotating plate 403 and the clamping plate 404 to rotate. The lower side of the clamping plate 404 is connected to the sensor 5, so that the sensor 5 rotates synchronously with the rotating shaft 401. The counterweights 405 are connected to the left and right sides of the lower surface of the sensor 5. The weights of the two counterweights 405 are equal. The counterweights 405 are made of metal material and will generate magnetic adsorption with the permanent magnet 2. When the door body 102 is ajar, the counterweights 405 are affected by the magnetic force of the permanent magnet 2, driving the sensor 5 to rotate, so that the sensor 5 is disconnected from the connecting member 9. At the same time, when the sensor 5 is affected by closing the door and swings to unload the force, through the magnetic force, the swinging amplitude of the sensor 5 can be quickly reduced, which is convenient for the sensor 5 to be quickly stabilized. The limiting member 402 includes a limiting ring 4021, a limiting groove 4022 and a limiting piece 4023. The limiting ring 4021 is connected to the upper side of the inner cavity of the housing 3. The limiting ring 4021 is located outside the rotating shaft 401 and is coaxially arranged with the rotating shaft 401. The limiting groove 4022 is provided with the limiting ring 4021. The limiting piece 4023 is connected to both sides of the rotating shaft 401. The limiting piece 4023 is arc-shaped and made of elastic metal. The transverse cross-section of the limiting groove 4022 is olive-shaped. When the limiting piece 4023 rotates, it contacts the limiting groove 4022. Thus, through the limiting piece 4023, the rotation angle of the rotating shaft 401 can be effectively limited. On the one hand, it can avoid the damage of the sensor 5 caused by the contact between the sensor 5 and the housing 3 during rotation. On the other hand, when the sensor 5 is affected by closing the door and swings within a limited range, the elastic setting of the limiting piece 4023 can effectively buffer the impact force when the rotating shaft 401 stops, thereby improving the stability of the sensor 5.

[0047] By setting the rotating assembly 4, the rotating shaft 401 is connected to the sensor 5 through the clamping plate 404, enabling the sensor 5 to rotate. When the impact generated by closing the door is transmitted to the housing 3, the housing 3 will transmit the vibration impact to the sensor 5. The sensor 5 converts the received impact force into the power of swinging, and reduces the impact on the sensor 5 through swinging, thereby improving the stability of the sensor 5 and ensuring the accuracy of the sensor 5. When the door is in a half-closed state for a long time, the door is not closed, but the permanent magnet 2 has moved to the lower side of the sensor 5, the inside of the sensor 5 is connected, and the rotating assembly 4 rotates the sensor 5. The magnetic attraction between the permanent magnet 2 and the counterweight 405 will cause the sensor 5 to rotate, and then the sensor 5 is disconnected from the connecting member 9, and the outside of the sensor 5 is disconnected. Through the dual detection inside and outside, the accuracy of detecting the fire door 1 is effectively improved. When the door is completely closed, the permanent magnet 2 drives the sensor 5 to reset and contact the connecting member 9 through magnetic force, and at this time, it is shown that the door is completely closed.

[0048] As an implementation manner of the present invention, referring to Figure 5 , Figure 8 , Figure 9 and Figure 10 , a gas groove 1031 is opened at the rear end of the top of the sealing strip 103. The inflating assembly 10 includes a conduit 1001, an expansion airbag 1002, a partition 1003, a buffer airbag 1004 and a through hole 1005. One end of the conduit 1001 is communicated with the gas groove 1031, and the expansion airbag 1002 is connected to the other end of the conduit 1001. By the door body 102 squeezing the gas groove 1031, the gas in the gas groove 1031 can flow into the expansion airbag 1002. The partition 1003 and the buffer airbag 1004 are sequentially connected to the side of the expansion airbag 1002 close to the sensor 5. The expansion directions of the expansion airbag 1002 and the buffer airbag 1004 are forward expansion. A through hole 1005 is opened on the surface of the partition 1003, and the diameter value of the through hole 1005 is smaller than the inner diameter value of the conduit 1001. The gas in the expansion airbag 1002 flows into the buffer airbag 1004 through the through hole 1005. By making the diameter value of the through hole 1005 smaller than the diameter value of the conduit 1001, the buffer airbag 1004 expands slowly. Then, during the expansion process of the buffer airbag 1004, a swinging space can be given to the sensor 5, and the impact generated by closing the door on the sensor 5 is reduced. At the same time, the slow expansion of the buffer airbag 1004 can slowly generate a squeezing force on the sensor 5, which is convenient for buffering the sensor 5. After the buffer airbag 1004 expands, it can squeeze the sensor 5 and limit the sensor 5, effectively ensuring the stability of the sensor 5. The front end of the expansion airbag 1002 is connected to the sliding member 7. When the expansion airbag 1002 expands rapidly, it will push the sliding member 7 away.

[0049] By providing the inflatable component 10, when the door is closed quickly, the door body 102 squeezes the air groove 1031, so that the gas in the air groove 1031 expands the expansion airbag 1002. After the expansion airbag 1002 expands, the gas will flow into the buffer airbag 1004 through the through hole 1005, so that the buffer airbag 1004 expands slowly, thereby relieving the force of the swinging sensor 5 during the expansion process. After the expansion is completed, the sensor 5 can be fixed to ensure the detection stability of the sensor 5.

[0050] As an embodiment of the present invention, refer to Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10, the sliding member 7 includes a bottom plate 701, a sliding block 702 and a clamping block 703. The bottom plate 701 is connected to the upper end of the spring 6. The sliding block 702 is connected to the upper side of the bottom plate 701, and the sliding block 702 can only slide back and forth on the bottom plate 701. A chamfer is provided on the left side of the top of the sliding block 702. The clamping block 703 is connected to the top of the sliding block 702 on the side away from the chamfer. The adjusting assembly 8 includes a frame 801, a long rack 802, a gear 803, a short rack 804 and a force-receiving member 805. The frame 801 is connected to the inner cavity of the housing 3, and the bottom plate 701 can only slide up and down in the frame 801. The long rack 802 is connected to the inner cavity of the frame 801, and the long rack 802 can only slide up and down inside the frame 801. The gear 803 is meshed and connected to the side of the long rack 802 close to the sensor 5, and the gear 803 is rotatably arranged. The short rack 804 is meshed and connected to the side of the gear 803 close to the sensor 5, and the short rack 804 can only slide up and down on the frame 801. The force-receiving member 805 is connected to the long rack 802. When the airbag is not inflated, when the clamping block 703 moves down, it will contact the force-receiving member 805, thereby driving the long rack 802 to move down. The connecting member 9 is connected to the short rack 804. By moving the short rack 804 up and down, the connecting member 9 can be driven to move up and down. The weight of the short rack 804 is greater than the weight of the long rack 802. When the long rack 802 is not stressed, due to the gravity trend generated by the weight of the short rack 804, the long rack 802 can be made to move down. The force-receiving member 805 includes a guide groove 8051, a guide plate 8052, a sliding plate 8053, a sliding groove 8054 and a spring piece 8055. The guide groove 8051 is opened in the inner cavity of the frame 801. The guide plate 8052 is slidably connected in the guide groove 8051. The sliding plate 8053 is connected to the guide plate 8052. A sliding groove 8054 is opened on the surface of the long rack 802, and the sliding plate 8053 is slidably connected to the sliding groove 8054. The spring piece 8055 is connected to the side of the sliding plate 8053 close to the sensor 5. The top of the spring piece 8055 is wavy, so that when the spring piece 8055 moves left and right, the friction with the clamping block 703 is reduced. The sliding groove 8054 includes an m section and an n section. The m section is located above the n section. When the spring 6 is in an open state, the distance value from the lower end of the chamfer to the lower end of the sensor 5 is greater than the height value of the m section ( Figure 7The middle spring 6 is in a contracted state), and further, the connecting member 9 includes a connecting piece 902 and a connecting plate 901. The connecting plate 901 is connected to the upper end of the short rack 804, and the connecting piece 902 is connected to the lower side of one end of the connecting plate 901. The angle between the connecting piece 902 and the connecting plate 901 is obtuse when the rotating plate 403 is in contact with the connecting piece 902. The end of the rotating plate 403 away from the rotating shaft 401 is arc-shaped. Therefore, when the rotating plate 403 is in contact with the connecting piece 902, the friction force between the rotating plate 403 and the connecting piece 902 is reduced. The distance from the upper end of the elastic piece 8055 to the sensor 5 near the sensor 5 is x, and the projection distance of the n segments from top to bottom is greater than x.

[0051] By setting the sliding member 7, the slider 702 can slide on the bottom plate 701. Further, when closing the door quickly, the inflated airbag 1002 can push the slider 702 to move horizontally, realizing the separation of the slider 702 from the sensor 5, facilitating the free swing of the sensor 5 to unload force. When closing the door after the concealed door, the slider 702 has moved to the lower side of the sensor 5. At this time, the inflation of the inflated airbag 1002 and the buffer airbag 1004 can limit the sensor 5, thereby improving the stability of the sensor 5. When the concealed door is closed, when the sliding member 7 moves downward, it will contact the force-receiving member 805, and then drive the long rack 802 to move downward, causing the connecting member 9 to move upward away from the sensor 5.

[0052] When the door body 102 of the fire door 1 is closed, the thrust of the automatic door closer on the door body 102 decreases due to the long-term use of part of the door body 102, and part of the impact force during closing is actively reduced to reduce the impact force. As a result, the thrust of the door body 102 during closing is insufficient, and the door body 102 is prone to being in a half-closed state. At this time, since the permanent magnet 2 moves to the lower side of the sensor 5, the magnetic force of the permanent magnet 2 acts on the sensor 5, resulting in the sensor 5 indicating that the door body 102 has been closed. However, there is a gap between the door body 102 and the door frame 101, and the door body 102 is not completely closed, and the detection of the door magnetic switch is inaccurate. In this solution, the sensor 5 is rotationally arranged. When the door body 102 is half-closed, the sensor 5 is parallel to the door body 102 by magnetic force, and the inside of the sensor 5 is connected, but the sensor 5 is disconnected from the connecting member 9, thereby realizing double-contact detection and achieving the purpose of accurate detection;

[0053] When the door body 102 is ajar, the permanent magnet 2 generates a magnetic force inside the sensor 5, causing the inside of the sensor 5 to be connected. To prevent the sensor 5 from giving a direct prompt, a circuit is set outside the sensor 5, and according to the rotation angle of the door body 102, the angle of the sensor 5 is adjusted. The sensor 5 is only connected to the connecting member 9 when the door body 102 is parallel to the door frame 101. Thus, when there is an angle between the door body 102 and the door frame 101, the current inside the sensor 5 is connected, while the circuit between the sensor 5 and the connecting member 9 is disconnected. Specifically, when the door body 102 is ajar, the permanent magnet 2 is close to the lower right of the sensor 5. Affected by the magnetic force, the inside of the sensor 5 is connected, and under the action of the magnetic force, the bottom plate 701 drives the slider 702 and the clamping block 703 to move downward. The clamping block 703 moves downward and contacts the elastic piece 8055, driving the elastic piece 8055 to move downward. The elastic piece 8055 drives the long rack 802 to move downward through the slide plate 8053, thereby driving the gear 803 to rotate. When the gear 803 rotates, the short rack 804 drives the connecting member 9 to move upward, causing the connecting member 9 to be disconnected from the sensor 5. After the slider 702 moves downward to a specified position, the limit on the sensor 5 is released. At this time, the sensor 5 can rotate around the rotating shaft 401. Due to the magnetic force effect between the counterweight 405 and the permanent magnet 2, the counterweight 405 is attracted to move to the shortest distance from the permanent magnet 2, causing the sensor 5 to rotate. The rotation of the sensor 5 deviates from the connecting member 9, thereby improving the accuracy of the sensor 5;

[0054] When personnel perform maintenance and close the door body 102, in order to give a prompt in a timely manner when the door body 102 is closed, after the sensor 5 rotates and deviates from the connecting member 9, the connecting member 9 is first reset. The rotation of the sensor 5 causes the contact point of the sensor 5 to deviate from directly below the connecting member 9. Thus, even if the connecting member 9 moves downward, the sensor 5 will not be triggered. Specifically, by setting the guide groove 8051, when the clamping block 703 drives the elastic piece 8055 to move downward, the elastic piece 8055 slides along the guide groove 8051 through the slide plate 8053 and the guide plate 8052. The n-section of the guide groove 8051 is inclined. Thus, when the guide plate 8052 moves downward in the n-section of the guide groove 8051, it will move along the n-section. The guide plate 8052 drives the elastic piece 8055 to move away from the sensor 5 through the slide plate 8053. The top of the elastic piece 8055 is separated from the lower side of the clamping block 703. The long rack 802 loses the downward pulling force, and the weight of the short rack 804 is relatively large, so it will move downward actively, thereby driving the connecting member 9 to move downward. To avoid accidental triggering of the connecting member 9, the angle between the connecting piece 902 and the connecting plate 901 is set to be an obtuse angle (as shown in Figure 10 when not being squeezed by the rotating plate 403), so that the connecting piece 902 deviates from the contact point of the sensor 5. After the door body 102 is completely closed, the rotating plate 403 driven by the rotation of the door body 102 squeezes the connecting piece 902, and the connecting piece 902 is perpendicular to the connecting plate 901, thus quickly completing the connection;

[0055] When the door body 102 is closed, the door body 102 will generate an inertial impact on the door frame 101. Under the long-term inertial impact, the inside of the sensor 5 will become loose, resulting in inaccurate detection. By setting up the inflatable component 10, when the door is closed, the inflatable component 10 expands to buffer the sensor 5, thereby reducing the impact on the sensor 5 to ensure the accurate detection of the sensor 5. Specifically, when the door is closed, the gas in the air groove 1031 of the sealing strip 103 is squeezed and flows through the conduit 1001 into the expansion airbag 1002, causing the expansion airbag 1002 to expand rapidly. The expansion of the expansion airbag 1002 will push the sliding part 7 forward, thus avoiding the contact between the sliding part 7 and the elastic piece 8055 and at the same time separating the sliding part 7 from the sensor 5, facilitating the swing and unloading of the sensor 5. When the expansion airbag 1002 expands, the buffer airbag 1004 will slowly expand, and then gradually squeeze the sensor 5 to complete the limit of the sensor 5. The flexible contact of the buffer airbag 1004 can effectively reduce the swing amplitude of the sensor 5 and the impact force between the sensor 5 and the buffer airbag 1004 during the swing, thereby further reducing the intensity of the impact on the sensor 5;

[0056] After the door is opened, the permanent magnet 2 does not generate magnetic force on the bottom plate 701. Then the spring 6 pushes the slider 702 to move upward through the bottom plate 701. The chamfer on the slider 702 is convenient for adjusting the angle of the sensor 5. During the upward movement of the slider 702, when the fixture block 703 contacts the elastic piece 8055, the elastic piece 8055 bends, enabling the fixture block 703 to complete the upward movement.

[0057] Although the embodiments of the present invention have been described, for those of ordinary skill in the art, under the understanding of the principles and spirit of the present invention, the embodiments can be changed and modified to obtain other effects. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A normally closed fire door state detection device, applied to a fire door (1), the fire door (1) comprising a door frame (101), a door body (102) and a sealing strip (103), the state detection device comprising a permanent magnet (2) and a housing (3), the permanent magnet (2) being mounted on the door body (102), the housing (3) being mounted on the door frame (101), characterized in that: The state detection device further comprises a rotating assembly (4), a sensor (5), a spring (6), a sliding member (7), an adjusting assembly (8) and a connecting member (9), wherein the rotating assembly (4) is connected to the inner cavity of the housing (3), the sensor (5) is connected to the lower end of the rotating assembly (4), the spring (6) is connected to the left and right sides of the inner cavity of the housing (3), the sliding member (7) is connected to the upper end of the spring (6), the adjusting assembly (8) is connected to the left and right sides of the housing (3), and the connecting member (9) is connected to one end of the adjusting assembly (8) close to the sensor (5). When the door body (102) is half-closed, the permanent magnet (2) generates magnetic attraction on the slide (7) to cause the slide (7) to move downward. When the slide (7) moves downward, the adjustment component (8) drives the connecting piece (9) to move upward and separate from the sensor (5). When the slide (7) moves downward to a specified position, the sensor (5) is unlocked. The rotating component (4) is affected by the magnetic force of the permanent magnet (2) and drives the sensor (5) to rotate away from the bottom of the connecting piece (9). When the door body (102) is closed, the magnetic force of the permanent magnet (2) pulls the sensor (5) back to its original position and connects with the connecting piece (9).

2. A normally closed fire door state detection device according to claim 1, characterized in that: The rotating assembly (4) comprises a rotating shaft (401), a limiting member (402), a rotating plate (403), a clamping plate (404) and a counterweight (405); the rotating shaft (401) is rotatably connected to the upper side of the inner cavity of the outer shell (3); the limiting member (402), the rotating plate (403) and the clamping plate (404) are sequentially connected to the outer periphery of the rotating shaft (401) from top to bottom; the lower side of the clamping plate (404) is connected to the sensor (5); the two counterweights (405) are respectively connected to the left and right sides of the lower surface of the sensor (5); and an inflatable assembly (10) is connected between the sliding member (7) and the adjusting assembly (8).

3. A normally closed fire door state detection device according to claim 2, characterized in that: The limiting member (402) comprises a limiting ring (4021), a limiting groove (4022) and a limiting plate (4023); the limiting ring (4021) is connected to the upper side of the inner cavity of the housing (3) and is coaxially arranged with the rotating shaft (401); the limiting ring (4021) is arranged in the limiting groove (4022); the limiting plate (4023) is connected to both sides of the rotating shaft (401); the limiting plate (4023) is arc-shaped and made of elastic metal; the transverse section of the limiting groove (4022) is rugby-shaped; and the limiting plate (4023) contacts the limiting groove (4022) when rotating.

4. A normally closed fire door state detection device according to claim 3, characterized in that: The rear end of the top of the sealing strip (103) is provided with an air groove (1031), and the inflatable component (10) comprises a catheter (1001), an inflatable airbag (1002), a partition (1003), a buffer airbag (1004) and a through hole (1005). One end of the catheter (1001) is connected to the air groove (1031), and the inflatable airbag (1002) is connected to the other end of the catheter (1001). The partition (1003) and the buffer airbag (1004) are connected in sequence to a side of the inflatable airbag (1002) close to the sensor (5). A through hole (1005) is provided on the surface of the partition (1003), and the diameter of the through hole (1005) is smaller than the inner diameter of the catheter (1001). The front end of the inflatable airbag (1002) is connected to the sliding member (7).

5. A normally closed fire door state detection device according to claim 4, characterized in that: The sliding member (7) comprises a bottom plate (701), a slider (702) and a clamping block (703); the bottom plate (701) is connected to the upper end of the spring (6); the slider (702) is connected to the upper side of the bottom plate (701); a chamfer is provided on the left side of the top of the slider (702); and the clamping block (703) is connected to the top of the slider (702) away from the chamfer.

6. A normally closed fire door state detection device according to claim 5, characterized in that: The adjustment component (8) comprises a frame (801), a long rack (802), a gear (803), a short rack (804) and a force-bearing member (805); the frame (801) is connected to the inner cavity of the housing (3); the long rack (802) is connected to the inner cavity of the frame (801); the gear (803) is meshedly connected to a side of the long rack (802) close to the sensor (5); the short rack (804) is meshedly connected to a side of the gear (803) close to the sensor (5); the force-bearing member (805) is connected to the long rack (802); the connecting member (9) is connected to the short rack (804); and the weight of the short rack (804) is greater than the weight of the long rack (802).

7. A normally closed fire door state detection device according to claim 6, characterized in that: The force-bearing member (805) comprises a guide groove (8051), a guide plate (8052), a slide plate (8053), a slide groove (8054) and a spring piece (8055); the guide groove (8051) defines an inner cavity of the frame (801); the guide plate (8052) is slidably connected in the guide groove (8051); the slide plate (8053) is connected to the guide plate (8052); a slide groove (8054) is defined on the surface of the long rack (802); the spring piece (8055) is connected to a side of the slide plate (8053) close to the sensor (5); and the top of the spring piece (8055) is wavy.

8. A normally closed fire door state detection device according to claim 7, characterized in that: The slide groove (8054) includes segment m and segment n, segment m is located on the upper side of segment n, segment m is vertical, and segment n is inclined.

9. A normally closed fire door state detection device according to claim 8, characterized in that: The connecting member (9) comprises a connecting plate (901) and a connecting piece (902); the connecting plate (901) is connected to the upper end of the short rack (804); the connecting piece (902) is connected to the lower side of one end of the connecting plate (901); when the rotating plate (403) is not in contact with the connecting piece (902), the angle between the connecting piece (902) and the connecting plate (901) is an obtuse angle; and the end of the rotating plate (403) away from the rotating shaft (401) is arc-shaped.

10. A normally closed fire door state detection device according to claim 8, characterized in that: The distance from the upper end of the spring sheet (8055) close to the sensor (5) to the long rack (802) is x, and the top view projection distance of the n segments is greater than x.

Images