A normally closed fireproof door signal feedback device

Abstract

The utility model discloses a normally closed fireproof door signal feedback device, switch sliding block, buffer spring, buffer sliding block, conducting strip and reset spring are all located in the shell, and one end of switch sliding block is stretched to the outside of shell from one end of shell, and end cap is located in the other end of shell, one end of buffer spring is connected with switch sliding block, and the other end is connected with buffer sliding block, and the both ends of reset spring are connected with switch sliding block and end cap respectively, and conducting strip is fixed to one end of buffer sliding block close to end cap, one end of wiring terminal is located in the side of end cap towards the inside of shell, and the other end penetrates end cap and is located in the side of end cap away from shell. The utility model can completely avoid the influence of external magnetic field, magnet itself magnetic field and fireproof door material and other factors on fireproof door state signal feedback, can adapt to the clearance of door frame and door leaf of different fireproof doors, and can avoid causing the damage of device internal structure.

Description

Technical Field

[0001] This utility model relates to the field of fire door technology, specifically to a normally closed fire door signal feedback device. Background Technology

[0002] A normally closed door closer is an automatic door closing device installed on a fire door to ensure that the fire door can automatically and smoothly close to the designated position after being opened by a person, thereby ensuring a tight fit between the door leaf and the door frame.

[0003] Currently, in order to monitor whether fire doors are open or closed, magnetic induction switches are usually installed on the door frame as signal feedback devices. The magnetic induction switch consists of a switch body and a magnet. The switch body is installed on the door frame, and the magnet is installed on the door leaf. When the door leaf is closed, the magnet is close to the switch body. The magnetic induction element inside the switch body senses the magnetic field of the magnet and causes the internal circuit to be turned on or off, thereby transmitting a feedback signal to the controller.

[0004] However, due to factors such as assembly errors, magnet magnetic field strength, environmental magnetic field interference, and the material of the fire door, signal feedback may fail. These include: 1. If the distance between the magnet and the switch body is too large, the magnetic sensing element cannot detect the magnet's magnetic field after the door is closed, and therefore fails to send a signal that the door is closed; 2. If the magnet's magnetic field strength is too strong, the magnetic sensing element may detect the magnet's magnetic field even when the door is not fully closed (leaving a gap), generating a signal that the door is closed; 3. External magnetic field interference may cause the door to remain open, allowing the magnetic sensing element to continuously detect the magnetic field and generate a signal that the door is closed; 4. When the magnet is installed on a steel fire door, the magnetic field may be dispersed due to the fire door material, resulting in a weakened magnetic field strength, preventing the magnetic sensing element from detecting the magnetic field and thus failing to send a signal that the door is closed. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the present invention aims to provide a signal feedback device for normally closed fire doors.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A normally closed fire door signal feedback device includes a housing, a switch slider, an end cap, a buffer spring, a buffer slider, a conductive sheet, a return spring, and a terminal block. The switch slider, buffer spring, conductive sheet, and return spring are all disposed inside the housing. One end of the switch slider extends from one end of the housing to the outside of the housing, and the end cap covers the other end of the housing. One end of the buffer spring is connected to the switch slider, and the other end is connected to the buffer slider. Both ends of the return spring are connected to the switch slider and the end cap, respectively. The conductive sheet is fixed to the end of the buffer slider near the end cap. One end of the terminal block is located on the side of the end cap facing the inside of the housing, and the other end passes through the end cap and is located on the side of the end cap away from the housing.

[0007] Furthermore, the switch slider is hollow inside and has an open structure at the other end, the buffer slider is hollow inside and has an open structure at the end away from the end cover, the end of the buffer slider away from the end cover extends into the interior of the switch slider, one end of the buffer spring extends into the interior of the switch slider and connects with the interior of the switch slider, and the other end extends into the interior of the buffer slider and connects with the interior of the buffer slider.

[0008] Furthermore, the buffer spring is sleeved on the outside of the buffer slider, with one end connected to the outer edge of the other end of the switch slider and the other end connected to the end cap.

[0009] Furthermore, the outer edge of one end of the housing is provided with a stepped structure, and the outer surface of the housing is provided with external threads.

[0010] The beneficial effects of this utility model are as follows: 1. This utility model uses a mechanical switch as a signal feedback switch, which can completely avoid the influence of external magnetic fields, the magnetic field of the magnet itself, and the material of the fire door on the feedback of the fire door status signal. 2. This utility model uses a threaded connection between the outer shell and the door frame and a locking nut to lock it, which can adapt to the gaps between the door frame and the door leaf of different fire doors and avoid the impact of the switch slider not being able to connect. 3. By setting up a buffer spring and a buffer slider, this utility model can effectively buffer the squeezing force generated by the switch slider on the conductive sheet, terminal and end cover and other components when the conductive sheet has come into contact with the terminal but the switch slider has not stopped moving, thereby avoiding damage to the internal structure of the device. Attached Figure Description

[0011] Figure 1 This is an external schematic diagram of the normally closed fire door signal feedback device in an embodiment of this utility model; Figure 2 This is a cross-sectional schematic diagram of the normally closed fire door signal feedback device in an embodiment of this utility model; Figure 3 This is an exploded view of the normally closed fire door signal feedback device in an embodiment of this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0013] This embodiment provides a signal feedback device for a normally closed fire door, such as... Figure 1-3 As shown, the device includes a housing 1, a switch slider 2, an end cap 3, a buffer spring 4, a buffer slider 5, a conductive sheet 6, a return spring 7, and a terminal block 8. The switch slider 2, buffer spring 4, buffer slider 5, conductive sheet 6, and return spring 7 are all disposed inside the housing 1. One end of the switch slider 2 extends from one end of the housing 1 to the outside of the housing 1, and the end cap 3 covers the other end of the housing 1. One end of the buffer spring 4 is connected to the switch slider 2, and the other end is connected to the buffer slider 5. The two ends of the return spring 7 are connected to the switch slider 2 and the end cap 3, respectively. The conductive sheet 6 is fixed to the end of the buffer slider 5 near the end cap 3. One end of the terminal block 8 is located on the side of the end cap 3 facing the inside of the housing 1, and the other end passes through the end cap 3 and is located on the side of the end cap 3 away from the housing 1.

[0014] During operation, the normally closed fire door signal feedback device is mounted on the door frame via its housing. When the door is closed, it exerts pressure on the switch slider. As the slider is pressed, it moves towards the end cover, and a buffer spring further pushes the buffer slider towards the end cover, causing the conductive plate to contact the terminal block, thus generating a feedback signal that is transmitted to the controller. If the switch slider has not yet stopped moving, it will compress the buffer spring, effectively preventing excessive pressure on the conductive plate, terminal block, and end cover, thus avoiding damage to the internal structure of the device. Simultaneously, the movement of the switch slider towards the end cover compresses the return spring. When the door opens and the switch slider is no longer compressed, the elastic potential energy of the return spring causes the switch slider to return to its original position.

[0015] In this embodiment, the switch slider 2 is hollow inside with one end open, and the buffer slider 5 is hollow inside with one end away from the end cap 3 open. The end of the buffer slider 5 away from the end cap 3 extends into the interior of the switch slider 2. One end of the buffer spring 4 extends into the interior of the switch slider 2 and connects to its interior, while the other end extends into the interior of the buffer slider 5 and connects to its interior. With this structural design, the signal feedback device can be kept small while adding components such as the buffer slider and buffer spring.

[0016] Furthermore, in this embodiment, the buffer spring 4 is sleeved on the outside of the buffer slider 5, with one end connected to the outer edge of the other end of the switch slider 2 and the other end connected to the end cap 3.

[0017] In this embodiment, the outer edge of one end of the housing 1 is provided with a stepped structure 9, and the outer surface of the housing 1 is provided with an external thread 11. A mounting hole matching the housing is pre-drilled at the target installation position on the door frame, and an internal thread matching the external thread of the housing is configured in the mounting hole. When installing the signal feedback device, first screw the locking nut 10 into the outside of the housing 1, then screw the other end of the housing 1 into the mounting hole. After adjusting and confirming that the position of one end of the switch slider 2 matches the gap between the door frame and the door leaf, the switch slider 2 can be pushed when the door leaf is closed. Then, the locking nut 10 is used to lock the housing 1 in the current position. The stepped structure of the housing limits the minimum length of the housing extending outwards.

[0018] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.

Claims

1. A normally closed fire door signal feedback device, characterized in that, The device includes a housing, a switch slider, an end cap, a buffer spring, a buffer slider, a conductive sheet, a return spring, and a terminal block. The switch slider, buffer spring, buffer slider, conductive sheet, and return spring are all housed within the housing. One end of the switch slider extends from one end of the housing to the outside of the housing, and the end cap covers the other end of the housing. One end of the buffer spring is connected to the switch slider, and the other end is connected to the buffer slider. Both ends of the return spring are connected to the switch slider and the end cap, respectively. The conductive sheet is fixed to the end of the buffer slider near the end cap. One end of the terminal block is located on the side of the end cap facing inwards from the housing, and the other end passes through the end cap and is located on the side of the end cap away from the housing.

2. The normally closed fire door signal feedback device according to claim 1, characterized in that, The switch slider is hollow inside and has an open structure at the other end. The buffer slider is hollow inside and has an open structure at the end away from the end cover. The end of the buffer slider away from the end cover extends into the interior of the switch slider. One end of the buffer spring extends into the interior of the switch slider and connects with the interior of the switch slider, and the other end extends into the interior of the buffer slider and connects with the interior of the buffer slider.

3. The normally closed fire door signal feedback device according to claim 2, characterized in that, The buffer spring is sleeved on the outside of the buffer slider, with one end connected to the outer edge of the other end of the switch slider and the other end connected to the end cap.

4. The normally closed fire door signal feedback device according to claim 1, characterized in that, The outer edge of one end of the housing has a stepped structure, and the outer surface of the housing has external threads.

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