Disassembling, assembling and maintaining mechanism of fire alarm for building weak current

Abstract

The utility model discloses a dismounting and maintenance mechanism of a fire alarm for building weak current, which belongs to the technical field of weak current, and comprises an alarm mounting seat, a mounting groove, a chute A, an adjusting frame, a groove and a fire alarm, the mounting groove is embedded below the alarm mounting seat, and the fire alarm is slidably arranged below the interior of the mounting groove. A groove is embedded in the lower portion of the inner wall of the mounting groove, sliding grooves A are embedded in the two sides of the lower portion of the alarm mounting base, and adjusting frames are slidably arranged on the lower portions of the interiors of the sliding grooves A through sliding blocks. According to the utility model, when a plurality of fire alarms are used for a long time and a worker needs to maintain and dismount the fire alarms, the fire alarms are dismounted from the inner side of the mounting groove, the electric contact B is driven to slide out of the groove, and after the electric contact B and the electric contact A are moved away, the fire alarms are quickly powered off; and a worker can quickly maintain the fire alarm, and manual power-off processing is not needed when the worker maintains the fire alarm.

Description

Technical Field

[0001] The utility model belongs to the technical field of weak electricity, in particular to a disassembly and assembly maintenance mechanism for a fire alarm for building weak electricity. Background Art

[0002] Weak current refers to electrical equipment with a voltage below AC 36V and DC 24V. For example, the fire alarm and fire linkage system is connected to the fire detectors through the control, management and network systems installed in the building. When there is an alarm signal, the corresponding equipment will be linked according to the received signal and the pre-set procedures to control the spread of the fire.

[0003] Among them, after searching, it was found that the application number is CN202321109484.4, a building electrical fire alarm, which is convenient for installation and removal of the smoke alarm through a slot, a horizontal slot, a slide slot, a plug rod, a clamp hole, a clamp rod, a vertical rod and a spring 1, so as to facilitate the maintenance of the smoke alarm, and through a ring 1, a ring 2 and a spring 2, after the smoke alarm is installed, the contact 1 and the contact 2 are always in contact with each other, so as to ensure the power supply of the smoke alarm; wherein, the shortcomings are as follows:

[0004] When the staff uses this type of building electrical fire alarm and installs it, the spring 1 drives the vertical rod and the clamping rod to reset, so that one end of the clamping rod enters the inside of the clamping hole to complete the installation of the smoke alarm. After the smoke alarm is installed, the contact 1 and the contact 2 are in contact and abut against each other, so that the spring 2 is in an extruded state, thereby ensuring the power supply to the smoke alarm. When installing the fire alarm, since the clamping rod and the vertical rod are only connected to the outside of the installation plate by a single spring, the clamping rod and the vertical rod themselves are more flexible, which makes the smoke alarm easy to loosen, and the contact 1 and the contact 2 are easy to move, resulting in poor contact and affecting the use. Utility Model Content

[0005] The utility model aims to provide a disassembly and assembly maintenance mechanism for a building weak current fire alarm in order to solve the problem that the above-mentioned building electrical fire alarm is prone to loosening.

[0006] The technical solution adopted by the utility model is as follows: a disassembly and assembly maintenance mechanism for a fire alarm for building weak current, comprising an alarm mounting seat, a mounting groove, a slide groove A, an adjustment frame, a groove and a fire alarm, wherein the alarm mounting seat is embedded with a mounting groove, a fire alarm is slidably arranged at the lower part of the mounting groove, a groove is embedded with a groove at the lower part of the inner wall of the mounting groove, slide grooves A are embedded with slide grooves A at both sides of the lower part of the alarm mounting seat, an adjustment frame is slidably arranged at the lower part of the slide groove A through a slider, a sliding disassembly and assembly mechanism for convenient disassembly and assembly of fire alarms of different specifications and an extrusion limit clamping mechanism for firmly limiting the fire alarm are respectively arranged on the outer side of the adjustment frame, and an elastic power-off mechanism is arranged on the inner side of the groove for convenient power-off when the fire alarm is disassembled.

[0007] The sliding disassembly mechanism is composed of a limit slot A, a telescopic rod A, a limit block A, a slide slot B, a limit slot B, a limit frame, a telescopic rod B, a limit block B and a limit clamp frame. The telescopic rod A is fixedly installed on the top of the adjustment frame, and a spring is matched with the outside of the telescopic rod A. A limit block A is fixedly installed on the end of the telescopic rod A. A limit slot A is embedded on the inner wall of the slide slot A. There are several limit slots A, which are equidistantly arranged in parallel in a semicircular shape, and the limit block A is slidingly arranged on the inner side of the limit slot A. The adjustment frame is embedded on the side. There is a slide groove B, and a limiting groove B is embedded on the side of the inner wall of the slide groove B. There are several limiting grooves B, and the upper part of the inner wall is arranged in an inclined shape. A limiting frame is arranged on the side of the inner part of the slide groove B through the sliding of a slider, and a limiting clamping frame is arranged on the side of the limiting frame. A telescopic rod B is fixedly installed on the upper and lower sides of the inner wall of the limiting frame near the inner side of the slide groove B, and a spring is matched on the outer side of the telescopic rod B. A limiting block B is fixedly installed on the side of the end of the telescopic rod B, and the upper part of the limit block B is arranged in an inclined shape, and the limit block B is slidingly arranged on the inner side of the limit groove B.

[0008] Among them, the extrusion limit clamping mechanism is composed of a damping telescopic rod A, and the damping telescopic rod A is fixedly installed between the upper and lower sides of the inner wall of the limit clamp frame and the side of the inner wall of the limit frame, and a spring is matched with the outside of the damping telescopic rod A, and the opposite side of the limit clamp frame is arranged in an arc shape.

[0009] Among them, the elastic power-off mechanism is composed of a slide groove C, an electric contact A, a damping telescopic rod B and an electric contact B. The electric contact B is embedded on the top of the fire alarm, and the slide groove C is embedded on both sides of the inner wall of the groove. The electric contact A is slidably arranged between the sides of the inner side of the slide groove C through a slider, and the slider matching the electric contact A and the outer ring of the inner wall of the fire alarm close to the electric contact B are both made of butadiene rubber. A damping telescopic rod B is fixedly installed between the top of the slider matching the electric contact A and the top of the inner wall of the slide groove C, and a spring is matched on the outside of the damping telescopic rod B.

[0010] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0011] 1. The disassembly and assembly maintenance mechanism of the weak-current fire alarm for buildings is provided with a sliding disassembly and assembly mechanism, which enables the staff to cooperate between the limit slot A, telescopic rod A, limit block A, slide slot B, limit slot B, limit frame, telescopic rod B, limit block B and limit clamp frame, and utilize the limit block A to slide freely inside the limit slot A through the telescopic rod A and the outer spring, and the limit block B to slide freely inside the limit slot B through the telescopic rod B and the outer spring. This facilitates the staff to quickly disassemble and maintain the fire alarm, avoids the effect of disassembling and assembling the fire alarm for too long to affect the normal use of the fire alarm, and facilitates the installation of fire alarms of different specifications.

[0012] 2. The disassembly and assembly maintenance mechanism of this type of building weak current fire alarm is provided with an extrusion limit clamping mechanism, which allows the staff to use the damping telescopic rod A and the outer spring to cooperate with the limit clamp frame to make use of the thrust generated by the damping telescopic rod A and the outer spring on the limit clamp frame when they are contracted, so that the limit clamp frame is squeezed and contacted with the surfaces on both sides of the fire alarm, thereby improving the effect of firmly clamping the fire alarm and preventing the fire alarm from loosening and falling.

[0013] 3. The disassembly and assembly maintenance mechanism of this type of building weak current fire alarm is equipped with an elastic power-off mechanism, which allows the staff to cooperate between the slide groove C, the electric contact A, the damping telescopic rod B and the electric contact B, and use the electric contact A to slide between the inner side of the slide groove C through the damping telescopic rod B and the outer spring, and squeeze the electric contact B. This makes it convenient for the staff to maintain the fire alarm without manually cutting off the power. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the front view of the three-dimensional structure of the fire alarm of the utility model;

[0015] Figure 2 This is a schematic diagram of the front cross-sectional structure of the fire alarm in the utility model;

[0016] Figure 3 For the utility model Figure 2 The enlarged schematic diagram of the structure at A in the middle;

[0017] Figure 4 This is a schematic diagram of the three-dimensional structure of the limiting frame in the utility model;

[0018] Figure 5 For the utility model Figure 2 A in the middle is a schematic diagram of the enlarged structure of Example 2.

[0019] Markings in the figure: 1. Alarm mounting base; 101. Mounting slot; 102. Slide A; 103. Limiting slot A; 104. Adjusting frame; 105. Telescopic rod A; 106. Limiting block A; 107. Slide B; 108. Limiting slot B; 2. Limiting frame; 201. Telescopic rod B; 202. Limiting block B; 203. Limiting clamp frame; 204. Damping telescopic rod A; 3. Groove; 301. Slide C; 302. Electric contact A; 303. Damping telescopic rod B; 4. Fire alarm; 401. Electric contact B. Implementation

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In the utility model:

[0022] Example 1: Reference Figure 1-5 A disassembly and assembly maintenance mechanism for a fire alarm for weak current in a building comprises an alarm mounting seat 1, an mounting groove 101, a slide groove A102, an adjustment frame 104, a groove 3 and a fire alarm 4. The mounting groove 101 is embedded at the bottom of the alarm mounting seat 1, a fire alarm 4 is slidably arranged at the bottom of the mounting groove 101, a groove 3 is embedded at the bottom of the inner wall of the mounting groove 101, slide grooves A102 are embedded at both sides of the bottom of the alarm mounting seat 1, an adjustment frame 104 is slidably arranged at the bottom of the slide groove A102 through a slider, a sliding disassembly and assembly mechanism for convenient disassembly and assembly of fire alarms of different specifications and an extrusion limit clamping mechanism for firmly limiting the fire alarm are arranged on the outside of the adjustment frame 104, and an elastic power-off mechanism for conveniently cutting off the power when the fire alarm is disassembled is arranged on the inside of the groove 3.

[0023] Reference Figure 1-4 , further, the sliding disassembly mechanism is composed of a limit groove A103, a telescopic rod A105, a limit block A106, a slide groove B107, a limit groove B108, a limit frame 2, a telescopic rod B201, a limit block B202 and a limit clamp frame 203;

[0024] A telescopic rod A105 is fixedly installed on the top of the adjustment frame 104, and a spring is matched on the outside of the telescopic rod A105. A limit block A106 is fixedly installed on the end of the telescopic rod A105. A limit slot A103 is embedded on the inner wall of the slide A102. There are several limit slots A103, which are equidistantly arranged in parallel in a semicircular shape, and the limit block A106 is slidably arranged on the inner side of the limit slot A103. A slide B107 is embedded on the side of the adjustment frame 104. A limit slot B108 is embedded on the side of the inner wall of the slide B107. There are several limit slots B108, and the upper part of the inner wall is inclined. A limit frame 2 is slidably arranged on the side of the slide B107 through a slider. A limit clamping frame 203 is arranged on the side of the limit frame 2. A telescopic rod B201 is fixedly installed on the upper and lower sides of the wall near the inner side of the slide groove B107, and a spring is matched on the outer side of the telescopic rod B201. A limit block B202 is fixedly installed on the side of the end of the telescopic rod B201, and the upper part of the limit block B202 is inclined, and the limit block B202 is slidingly arranged on the inner side of the limit groove B108. When the staff needs to install several fire alarms 4 in the building, one of the alarm mounting seats 1 is fixed to the specified position of the wall of the building by bolts, and one of the fire alarms 4 is placed on the inner side of the installation groove 101, and the adjustment frame 104 is pushed to slide on the inner side of the slide groove A102, squeezing the limit block A106 to slide out of the limit groove A103 to drive the telescopic rod A105 and the outer spring to contract. After driving the limit clamp 203 to contact the fire alarm 4, the telescopic rod A105 and the outer spring pop-up limit block A106 slide into the inner side of one of the relative limit slots A103, and then adjust the other adjustment frame 104 in the same way, push the two limit frames 2 to slide on the inner side of the slide slot B107 through the slider, squeeze the limit block B202 to slide out of the limit slot B108, drive the telescopic rod B201 and the outer spring to contract, so that the limit clamp 203 completely contacts the surfaces on both sides of the fire alarm 4, and after limiting the fire alarm 4, the telescopic rod B201 and the outer spring pop-up limit block B202 slide into the inner side of one of the relative limit slots B108. After completing the installation of the fire alarm 4, the staff installs the remaining fire alarms 4 in the same way. It is installed on the walls of different positions in the building for long-term use. When the staff needs regular maintenance, they push the two adjustment frames 104 in the opposite direction to slide inside the slide slot A102, squeeze the limit block A106 to slide out of the limit slot A103, drive the telescopic rod A105 and the outer spring to contract, drive the limit clamp frame 203 to release the contact with the fire alarm 4, and then the telescopic rod A105 and the outer spring pop out the limit block A106 to slide into the inner side of one of the relative limit slots A103, and the staff removes the fire alarm 4 from the inner side of the installation slot 101 for maintenance, and then installs it in the same way, which is convenient for the staff to quickly disassemble and maintain the fire alarm 4, and can avoid disassembling and assembling the fire alarm 4 for too long to affect the normal use of the fire alarm 4.It is convenient to install different specifications of fire alarm 4.

[0025] Reference Figure 2-3 ,Furthermore, the extrusion limit clamping mechanism is composed of a damping telescopic rod A204;

[0026] A damping telescopic rod A204 is fixedly installed between the upper and lower sides of the inner wall of the limit clamp 203 and the inner wall of the limit frame 2, and a spring is arranged on the outer side of the damping telescopic rod A204, and the opposite sides of the limit clamp 203 are arranged in an arc shape. When the staff adjusts the positions of the two adjustment frames 104 and the limit frame 2 to limit the fire alarm 4, the limit clamp 203 will pop out through the damping telescopic rod A204 and the outer spring, driving the limit clamp 203 to squeeze and contact the surfaces on both sides of the fire alarm 4, so that the contracted damping telescopic rod A204 and the outer spring generate a thrust on the limit clamp 203 to limit, squeeze and clamp the fire alarm 4, and then complete the fixation of the fire alarm 4, thereby improving the effect of firmly limiting and clamping the fire alarm 4, and preventing the fire alarm 4 from loosening and falling.

[0027] Reference Figure 2 , further, the elastic power-off mechanism is composed of a slide slot C301, an electric contact A302, a damping telescopic rod B303 and an electric contact B401;

[0028] An electric contact B401 is embedded above the fire alarm 4, and slide grooves C301 are embedded on both sides of the inner wall of the groove 3. Electric contacts A302 are slidably arranged between the sides of the inner part of the slide groove C301 through a slider, and the slider matching the electric contact A302 and the outer ring of the inner wall of the fire alarm 4 close to the electric contact B401 are made of butadiene rubber. A damping telescopic rod B303 is fixedly installed between the upper part of the slider matching the electric contact A302 and the upper part of the inner wall of the slide groove C301, and a spring is matched on the outer side of the damping telescopic rod B303. When the staff places the fire alarm 4 inside the installation groove 101 for installation, the electric contact B401 above the fire alarm 4 will be driven to slide into the groove 3 to squeeze the electric contact A302 in the slide groove C301 through the slider made of butadiene rubber. 301 slides inside, and squeezes the damping telescopic rod B303 and the outer spring to contract, so that the contracted squeezing damping telescopic rod B303 and the outer spring generate thrust on the electric contact A302 and stably contact the electric contact B401, and then the fire alarm 4 is automatically powered on. When several fire alarms 4 are used for a long time and the staff needs to maintain and disassemble the fire alarm 4, after the fire alarm 4 is removed from the inside of the installation groove 101, the electric contact B401 will be driven to slide out of the groove 3, so that the electric contact B401 and the electric contact A302 are moved away, and the fire alarm 4 will be quickly powered off, so that the staff can quickly maintain the fire alarm 4, and it is convenient for the staff to maintain the fire alarm 4 without manual power-off.

[0029] Reference Figure 1-3 Furthermore, the fire alarm 4 and the electric contact B401 are electrically connected through a wire, the electric contact A302 is electrically connected to an external matching control panel through a wire, and the control panel is electrically connected to the battery. Example

[0030] like Figure 5 As shown, in addition to the embodiment in which a limiting block A106 is fixedly installed above the end of the telescopic rod A105, a limiting groove A103 is embedded above the inner wall of the slide groove A102, a plurality of limiting grooves A103 are arranged equidistantly in a semicircular shape, and the limiting block A106 is slidably arranged on the inner side of the limiting groove A103, there is another embodiment in which a limiting block A106 is fixedly installed above the end of the telescopic rod A105, and the limiting block A106 is arranged in a trapezoidal shape, a limiting groove A103 is embedded above the inner wall of the slide groove A102, a plurality of limiting grooves A103 are arranged equidistantly in a trapezoidal shape, and the limiting block A106 The fitting slide is arranged on the inner side of the limit groove A103. When the staff pushes the adjustment frame 104 to slide on the inner side of the slide groove A102, the limit block A106 is squeezed out of the limit groove A103 to drive the telescopic rod A105 and the outer spring to contract, and then the limit clamp frame 203 contacts the fire alarm 4. Then, the telescopic rod A105 and the outer spring pop out the trapezoidal limit block A106 and slide into the inner side of one of the relative trapezoidal limit grooves A103, which will make the contact area between the trapezoidal limit block A106 and the trapezoidal limit groove A103 larger, increase the friction area, and perform a more stable limit processing on the adjustment frame 104. Compared with the first embodiment, the stable limit effect is better.

[0031] Working principle: First, when the staff needs to install several fire alarms 4 in the building, they fix one of the alarm mounting bases 1 to the specified position on the wall of the building with bolts, and after placing one of the fire alarms 4 on the inner side of the mounting groove 101, push the adjustment frame 104 to slide on the inner side of the slide groove A102, squeeze the limit block A106 to slide out of the limit groove A103, drive the telescopic rod A105 and the outer spring to contract, drive the limit clamp frame 203 to contact the fire alarm 4, the telescopic rod A105 and the outer spring pop out the limit block A106 to slide into the inner side of one of the relative limit grooves A103, and then move the other adjustment frame 104 in the same way. After the section frame 104 is adjusted, the two limit frames 2 are pushed to slide inside the slide groove B107 through the slider, and the limit block B202 is squeezed to slide out of the limit groove B108, driving the telescopic rod B201 and the outer spring to contract, and the limit clamp frame 203 will pop out through the damping telescopic rod A204 and the outer spring, driving the limit clamp frame 203 to squeeze and contact the surfaces on both sides of the fire alarm 4, so that the contracted damping telescopic rod A204 and the outer spring generate a thrust on the limit clamp frame 203 to limit and squeeze and clamp the fire alarm 4, and then the telescopic rod B201 and the outer spring pop out the limit block B202 to slide into the inner side of one of the relative limit grooves B108, and then drive the fire alarm 4 to move. The electric contact B401 above the fire alarm 4 slides into the groove 3 to squeeze the electric contact A302 to slide inside the slide groove C301 through the butyl rubber slider, and squeezes the damping telescopic rod B303 and the outer spring to contract, so that the contracted squeezing damping telescopic rod B303 and the outer spring generate thrust on the electric contact A302 and stably contact the electric contact B401, and then the fire alarm 4 is automatically powered on and installed. The staff then installs the remaining fire alarms 4 on the walls of different locations in the building in the same way for long-term use. Finally, when the staff needs regular maintenance, they push the two adjustment frames in the opposite direction. 104 slides on the inner side of the slide groove A102, squeezes the limit block A106 to slide out of the limit groove A103, drives the telescopic rod A105 and the outer spring to contract, drives the limit clamp 203 to release the contact with the fire alarm 4, and then the telescopic rod A105 and the outer spring pop out the limit block A106 to slide into the inner side of one of the relative limit grooves A103, and when the staff removes the fire alarm 4 from the inner side of the installation groove 101, it drives the electric contact B401 to slide out of the groove 3, so that the electric contact B401 and the electric contact A302 are moved away, and then the fire alarm 4 is quickly powered off for maintenance, and then installed in the same way for long-term use.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A disassembly and assembly maintenance mechanism for a fire alarm for weak current in a building, comprising an alarm mounting seat (1), a mounting groove (101), a slide groove A (102), an adjustment frame (104), a groove (3) and a fire alarm (4), wherein the alarm mounting seat (1) is embedded with a mounting groove (101) at the bottom, a fire alarm (4) is slidably arranged at the bottom of the mounting groove (101), a groove (3) is embedded at the bottom of the inner wall of the mounting groove (101), slide grooves A (102) are embedded at both sides at the bottom of the alarm mounting seat (1), an adjustment frame (104) is slidably arranged at the bottom of the slide groove A (102) via a slider, and the characteristics are as follows: The outer side of the adjustment frame (104) is respectively provided with a sliding disassembly mechanism for facilitating the disassembly and assembly of fire alarms of different specifications, and a squeezing limit clamping mechanism for firmly limiting the position of the fire alarm, and the inner side of the groove (3) is provided with an elastic power-off mechanism for conveniently cutting off the power when disassembling the fire alarm; The sliding disassembly mechanism is composed of a limit groove A (103), a telescopic rod A (105), a limit block A (106), a slide groove B (107), a limit groove B (108), a limit frame (2), a telescopic rod B (201), a limit block B (202) and a limit clamp frame (203); A telescopic rod A (105) is fixedly installed on the top of the adjustment frame (104), and a spring is matched to be arranged on the outside of the telescopic rod A (105); a limit block A (106) is fixedly installed on the top of the end of the telescopic rod A (105); a limit groove A (103) is embedded on the top of the inner wall of the slide groove A (102), and the limit block A (106) is slidably arranged on the inner side of the limit groove A (103); a slide groove B (107) is embedded on the side of the adjustment frame (104), and a limit block A (106) is embedded on the side of the inner wall of the slide groove B (107). A limit frame (2) is slidably arranged on the inner side of the slide groove B (107) through a slider, a limit clamp frame (203) is arranged on the side of the limit frame (2), a telescopic rod B (201) is fixedly installed on the upper and lower sides of the inner wall of the limit frame (2) close to the inner side of the slide groove B (107), and a spring is matched with the outer side of the telescopic rod B (201), a limit block B (202) is fixedly installed on the side of the end of the telescopic rod B (201), and the limit block B (202) is slidably arranged on the inner side of the limit groove B (108).

2. A disassembly and assembly maintenance mechanism for a building weak current fire alarm as claimed in claim 1, characterized in that: The extrusion limiting clamping mechanism is composed of a damping telescopic rod A (204); A damping telescopic rod A (204) is fixedly installed between the upper and lower sides of the inner wall of the limiting clamp frame (203) and the inner wall of the limiting frame (2), and a spring is matchedly arranged on the outer side of the damping telescopic rod A (204).

3. A disassembly and assembly maintenance mechanism for a building weak current fire alarm as claimed in claim 1, characterized in that: The elastic power-off mechanism is composed of a slide slot C (301), an electric contact A (302), a damping telescopic rod B (303) and an electric contact B (401); An electric contact B (401) is embedded on the top of the fire alarm (4), and slide grooves C (301) are embedded on both sides of the inner wall of the groove (3). An electric contact A (302) is slidably arranged between the inner sides of the slide groove C (301) via a slider, and a damping telescopic rod B (303) is fixedly installed between the upper side of the slider matching the electric contact A (302) and the upper side of the inner wall of the slide groove C (301), and a spring is matched on the outer side of the damping telescopic rod B (303).

4. A disassembly and assembly maintenance mechanism for a building weak current fire alarm as claimed in claim 1, characterized in that: There are a plurality of limit grooves A (103) which are arranged in parallel and at equal distances in a semicircle. There are a plurality of limit grooves B (108) which are arranged in an inclined shape on the upper part of the inner wall. The limit block B (202) is arranged in an inclined shape on the upper part.

5. A disassembly and assembly maintenance mechanism for a building weak current fire alarm as claimed in claim 2, characterized in that: The side opposite surfaces of the limiting clamp frame (203) are arranged in an arc shape.

6. A disassembly and assembly maintenance mechanism for a building weak current fire alarm as claimed in claim 3, characterized in that: The sliding block matched with the electric contact A (302) and the outer ring of the inner wall of the fire alarm (4) close to the electric contact B (401) are both made of butadiene rubber.

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