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CN-224232223-U - Door magnetic alarm for fire door

CN224232223UCN 224232223 UCN224232223 UCN 224232223UCN-224232223-U

Abstract

The utility model discloses a door magnetic alarm for a fire door, which belongs to the technical field of door magnetic alarms and comprises an alarm shell and a permanent magnet shell, wherein a protection mechanism is arranged in the inner wall of the alarm shell, when the protection mechanism is added and a toothed plate and a magnet follow the movement of a door plate and are far away from or close to a door magnetic switch, the meshing of a driving gear at the bottom of the door magnetic switch can be kept under the pulling and rotating actions of a spring and a hinging seat and the driving of the driving gear drives a worm to drive a worm wheel to rotate, so that a magnetism blocking grille is opened or closed, when the magnet is far away from the door magnetic switch, one side of the door magnetic switch is of a magnetism blocking sealing structure, when the door plate is closed and the magnet returns, the magnetism blocking grille is opened, the magnetic field of the door plate magnet acts on a magnetism sensor again, and the closing of the door can be accurately identified, the normally closed fire door can be effectively monitored, and the fire door can be prevented from being opened for a long time, and fire hazards can be brought.

Inventors

  • SUN LONG
  • WANG WEIPING

Assignees

  • 江苏土星智慧科技有限公司

Dates

Publication Date
20260512
Application Date
20250611

Claims (6)

  1. 1. The door magnetic alarm for the fire door comprises an alarm shell (3) and a permanent magnet shell (4) and is characterized in that a protection mechanism (5) is arranged in the inner wall of the alarm shell (3); the protection mechanism (5) comprises a magnetism blocking grille (501) rotatably mounted on the inner wall of the alarm shell (3), a worm wheel (502) is sleeved on one end shaft of the magnetism blocking grille (501), a worm (503) is meshed on one side of the worm wheel (502), a driving gear (504) is sleeved on the bottom end of the worm (503) penetrating through the alarm shell (3), and a toothed plate (507) with a tooth structure is meshed on one side of the outer portion of the driving gear (504).
  2. 2. A door magnetic alarm for fire doors according to claim 1, wherein the protection mechanism (5) further comprises a first fixing frame (505) and a second fixing frame (506) fixed at one corner of the bottom of the alarm housing (3) and the permanent magnet housing.
  3. 3. The door magnetic alarm for the fire door according to claim 2, wherein one end of the toothed plate (507) is rotatably installed with the second fixed frame (506) through a hinge seat (508), and a spring (509) is clamped between the inner side wall of the toothed plate (507) and the inner wall of the second fixed frame (506).
  4. 4. A door magnetic alarm for fire door according to claim 3, wherein the outside of the magnetic shielding grille (501) is provided with a sealing plate (6) which is made of the same material as the alarm shell (3) and is integrally installed.
  5. 5. The door magnetic alarm for the fire door according to claim 4, wherein a control circuit board (301) is transversely arranged in the alarm shell (3), a lithium battery (302) is electrically connected to the top of the control circuit board (301), a magnetic sensor (303) is fixed on one side of the outer wall of the control circuit board (301) through a bracket, and a permanent magnet (401) is packaged in the permanent magnet shell (4).
  6. 6. The door magnetic alarm for the fire door according to claim 5, wherein the alarm shell (3) is fixedly arranged on the door frame (1), and the permanent magnet shell (4) is fixedly arranged on the door plate (2).

Description

Door magnetic alarm for fire door Technical Field The utility model relates to the technical field of door magnetic alarms, in particular to a door magnetic alarm for a fire door. Background The door magnetic alarm consists of a switch and a magnet, wherein the switch part is formed by connecting a magnetic spring switch through a lead wire, shaping and packaging, the magnet part is formed by packaging a magnet with corresponding magnetic field intensity in a plastic or alloy shell, and when the switch is separated or approaches to a certain distance, the switch is turned off to induce the change of the position of an object, so that the door magnetic alarm is generally used in the field of urban security protection. The existing door magnetic alarm switch is in a corresponding state with the magnet, the magnet loses the magnetic field effect of the magnet spring in the switch after the door is opened, so that an alarm circuit is triggered, and after the magnet is closed again after the door is closed, the conducting strip in the magnet spring is magnetized again to be communicated, so that the alarm circuit is disconnected. The disadvantage of this kind of structure is, under the condition that opens the door and do not close the door, use the magnet on the magnet replacement door with magnetic field intensity to be close to the door magnetic switch, can induce the door magnetic switch to discern that the door has closed, alarm circuit also can be disconnected by automatic control or by long-range manual disconnection, and then lost the effect of door magnetic alarm, so the operation is to the fire door of normal close, the user is in order to get in and out the convenience, the sampling this mode keeps the opening of door, and can not trigger the warning yet, can not obtain effectual supervision, hidden danger when can increase the conflagration. In order to solve the problems, a door magnetic alarm for a fire door is provided. Disclosure of utility model The utility model mainly aims to provide a door magnetic alarm for a fire door, which solves the problems in the background art. The aim of the utility model can be achieved by adopting the following technical scheme: The door magnetic alarm for the fire door comprises an alarm shell and a permanent magnet shell, wherein a protection mechanism is arranged in the inner wall of the alarm shell; the protection mechanism comprises a magnetism blocking grille which is rotatably arranged on the inner wall of the alarm shell, a worm wheel is nested on one end shaft of the magnetism blocking grille, a worm is meshed on one side of the worm wheel, a driving gear is sleeved on the bottom end of the worm, which penetrates through the rear part of the alarm shell, and a toothed plate with a tooth structure is meshed on one side of the outer part of the driving gear. Further, the protection mechanism further comprises a first fixing frame and a second fixing frame which are fixed at one corner of the bottoms of the alarm shell and the permanent magnet shell. Further, the toothed plate one end with rotate the installation through articulated seat between the fixed frame of second, the inside wall of toothed plate with the card is pressed between the fixed frame inner wall of second has the spring. Further, the outside of fender magnetism grid be provided with alarm casing the same material just sealing plate of an organic whole installation. Further, a control circuit board is transversely arranged in the alarm shell, a lithium battery is electrically connected to the top of the control circuit board, a magnetic sensor is fixed to one side of the outer wall of the control circuit board through a support, and a permanent magnet is packaged in the permanent magnet shell. Further, the alarm shell is fixedly arranged on the door frame, and the permanent magnet shell is fixedly arranged on the door plate. The beneficial technical effects of the utility model are as follows: According to the utility model, the protection mechanism is added on the traditional door magnetic alarm, the toothed plate and the magnet are moved along with the door plate, when the toothed plate and the magnet are far away from or close to the door magnetic switch, the meshing of the driving gear at the bottom of the door magnetic switch can be kept under the pulling and rotating actions of the spring and the hinging seat, the driving gear drives the worm to rotate, and the magnetism blocking grille is opened or closed, so that when the magnet is far away from the door magnetic switch, one side of the door magnetic switch is of a magnetism blocking sealing structure, a new magnet is prevented from approaching to induce the door magnetic switch to identify the closing of the door, when the door plate is closed, the magnetism blocking grille is opened, the magnetic field of the door plate magnet acts on the magnetism sensor again, the closing of the door can be accurately identified, further the effec