Fire alarm bell

Abstract

The utility model discloses a fire-fighting alarm bell, which relates to a fire-fighting appliance and comprises a cover. A protruding part is arranged in the center of the inner side of the covering cover, a mounting plate is fixedly mounted on the protruding part, and a guide rod with hammer heads arranged at the two ends is slidably arranged on the mounting plate. The driving mechanism drives the guide rod to move in a reciprocating mode, the driving mechanism comprises a rotating disc, short columns are arranged on the end face of the rotating disc in a circumferential array mode, and the multiple short columns are in intermittent rolling connection with the extending part on the guide rod; the inner wall of the covering cover is provided with a spring plate, and the end of the spring plate extends to and is close to the protruding part. And the spring plates are arranged in a circumferential array and are shifted by the hammer head at one end of the guide rod. According to the fire alarm bell, the guide rod is driven by the driving mechanism to keep reciprocating motion, and in the moving process, the cover cover and the spring plate can be knocked, so that a reciprocating stroke is realized, and the cover cover and the spring plate can sound.

Description

Technical Field

[0001] The utility model relates to fire fighting equipment, in particular to a fire alarm. Background Art

[0002] The fire alarm is an important part of the fire protection system. Its purpose is to remind people to evacuate quickly by making sounds.

[0003] In conjunction with the publication (announcement) number: CN209015365U, the publication (announcement) date: 2019-06-21, a fire alarm is disclosed, which distinguishes between positive and negative poles by connecting a diode in series in the internal circuit of the alarm; the motor will only rotate when it is positively connected and drive the striker to hit the sounding outer disk to produce an alarm sound, and a diode connected in parallel with the motor is reversely connected after the diode to eliminate the induced electromotive force and release the vibration sound of a standard alarm; the motor is fixed on a fixed frame, and when the motor is powered on and rotates, the crankshaft rotates together, driving the transmission connecting plate to pull back and forth, and acting on the striker together with the spring (the spring causes the striker to hit the sounding outer disk, and the transmission connecting plate pulls the striker away from the sounding outer disk), intermittently causing the striker to continuously hit the external sounding outer disk to emit a louder alarm sound.

[0004] In the prior art including the above-mentioned patent, the alarm sound is emitted by a motor driving the striker to move back and forth and strike to produce sound. The volume of the sound depends entirely on the sound directly produced by the striking, and one reciprocating stroke has only one pronunciation stroke. How to improve the pronunciation efficiency in the reciprocating stroke is expected to be well solved! Utility Model Content

[0005] The purpose of the utility model is to provide a fire alarm bell to solve the above problems.

[0006] In order to achieve the above-mentioned object, the utility model provides the following technical solutions: a fire alarm bell, comprising a covering cover;

[0007] A raised portion is provided at the inner center of the cover, a mounting plate is fixedly mounted on the raised portion, and a guide rod with hammer heads at both ends is slidably mounted on the mounting plate;

[0008] It also includes a driving mechanism for driving the guide rod to reciprocate, the driving mechanism including a rotating disk with short columns arranged in a circumferential array on the end surface, and a plurality of the short columns are intermittently rollingly connected to the extension portion on the guide rod;

[0009] The inner wall of the cover is provided with a spring plate whose end extends to and is arranged adjacent to the raised portion;

[0010] The spring plates are arranged in a circular array and are moved by a hammer at one end of the guide rod.

[0011] Preferably, the spring plate is arranged obliquely, and a plurality of spring leaves are stamped out thereon, which are bent toward the inner side of the cover and have V-shaped fork portions formed at the ends.

[0012] Preferably, the spring plate is stepped, and a spring leaf is distributed on each step.

[0013] Preferably, a back plate is further included, the protrusion is inserted into a boring of a connection portion provided with the back plate, and is threadedly connected and fixed to the connection portion via a screw inserted into a recessed portion on the outer side surface of the covering cover.

[0014] Preferably, a dustproof net is provided in the interval between the end of the covering cover and the back plate.

[0015] Preferably, a first bevel gear is fixedly disposed on the outer wall of the rotating disk and meshes with a second bevel gear rotatably disposed on the mounting plate.

[0016] Preferably, a plurality of the second bevel gears are connected via a synchronous gear transmission;

[0017] It also includes a driving motor which is mounted on the raised portion and is transmission-connected to the above-mentioned synchronous wheel.

[0018] Preferably, the guide rod is provided with an equidistant spring with one end connected to the mounting plate.

[0019] In the above technical solution, the fire alarm provided by the utility model has the following beneficial effects: the guide rod is driven by the driving mechanism to keep reciprocating movement, and during the movement, it will knock the cover cover and the spring plate to achieve a reciprocating stroke to make the cover cover and the spring plate sound;

[0020] Furthermore, a plurality of spring plates form a cover body, and the sound produced by striking the cover body will also cause resonance of the plurality of spring plates, which will then be plucked again, thereby increasing the audio frequency and making the sound more penetrating. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0022] Figure 1 The overall structural diagram provided for the embodiment of the utility model;

[0023] Figure 2 A schematic diagram of a local structure provided for an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1. Back plate; 2. Cover cover; 21. Raised portion; 3. Mounting plate; 4. Guide rod; 41. Extension portion; 5. Driving mechanism; 51. Rotating disk; 511. First bevel gear; 52. Second bevel gear; 53. Synchronous wheel; 6. Dust screen; 7. Equidistant spring; 8. Spring plate; 81. Leaf spring; 82. V-shaped fork. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] like Figure 1-2 As shown, a fire alarm bell comprises a covering cover 2;

[0028] A raised portion 21 is provided at the inner center of the cover 2, a mounting plate 3 is fixedly mounted on the raised portion 21, and a guide rod 4 with hammer heads at both ends is slidably mounted on the mounting plate 3;

[0029] It also includes a driving mechanism 5 for driving the guide rod 4 to reciprocate, the driving mechanism 5 includes a rotating disk 51 with short columns arranged in a circumferential array on the end surface, and the plurality of short columns are intermittently rollingly connected to the extension portion 41 on the guide rod 4;

[0030] The inner wall of the cover 2 is provided with a spring plate 8 whose end extends to and is arranged adjacent to the raised portion 21;

[0031] The spring plates 8 are arranged in a circular array and are moved by a hammer at one end of the guide rod 4 .

[0032] Specifically, in the above embodiment, the driving motor is installed on the protruding portion 21 to drive the rotating disk 51 to rotate.

[0033] In the above technology, the guide rod 4 is driven by the driving mechanism 5 to keep reciprocating, and during the movement, it will knock the cover 2 and the spring plate 8 to achieve a reciprocating stroke to make the cover 2 and the spring plate 8 sound;

[0034] Furthermore, a plurality of spring plates 8 form a cover body, and the sound produced by striking the cover 2 will also cause resonance of the plurality of spring plates 8, which will then be plucked again, thereby increasing the audio frequency and making the sound more penetrating.

[0035] As an embodiment further provided by the present invention, the spring plate 8 is arranged obliquely, and a plurality of spring leaves 81 bent toward the inner side of the cover 2 and having V-shaped fork portions 82 formed at the ends are stamped out of the spring plate 8 .

[0036] The spring plate 8 provided above is in a stepped shape, and a spring leaf 81 is distributed on each step.

[0037] As an embodiment further provided by the utility model, it also includes a back plate 1, the protrusion 21 is inserted into the boring of the connecting part set with the back plate 1, and is threadedly connected and fixed to the connecting part through a screw inserted into the recessed part on the outer side surface of the covering cover 2.

[0038] Specifically, the back plate 1 in the embodiment is fixed to the wall by expansion screws, and then the cover 2 is installed on the back plate 1.

[0039] As an embodiment further provided by the present invention, a dustproof net 6 is arranged in the interval between the end of the cover 2 and the back plate 1 .

[0040] Specifically, dust and small insects can be prevented from entering the interior of the cover 2.

[0041] As an embodiment further provided by the present invention, a first bevel gear 511 is fixedly disposed on the outer wall of the rotating disk 51 and is meshed with a second bevel gear 52 rotatably disposed on the mounting plate 3 .

[0042] Secondly, the plurality of second bevel gears 52 are connected by transmission via a synchronous wheel 53;

[0043] It also includes a driving motor which is mounted on the protruding portion 21 and is transmission-connected to the synchronous wheel 53 .

[0044] Furthermore, an equidistant spring 7 is provided on the guide rod 4 , one end of which is connected to the mounting plate 3 .

[0045] In the above technology, the driving motor drives the synchronous belt to move, thereby driving all the synchronous wheels 53 to rotate, and then driving the second bevel gear 52 to rotate, and finally the rotating disk 51 rotates the guide rod 4 to keep reciprocating. During the movement, it will knock the covering cover 2 and the spring plate 8 to achieve a reciprocating stroke, which can make the covering cover 2 and the spring plate 8 sound.

[0046] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A fire alarm, characterized in that: including a covering hood (2); A raised portion (21) is provided at the inner center of the cover (2), a mounting plate (3) is fixedly mounted on the raised portion (21), and a guide rod (4) with hammer heads at both ends is slidably mounted on the mounting plate (3); It also includes a driving mechanism (5) for driving the guide rod (4) to reciprocate, the driving mechanism (5) comprising a rotating disk (51) having short columns arranged in a circumferential array on its end surface, the plurality of short columns being intermittently rollingly connected to the extension portion (41) on the guide rod (4); The inner wall of the cover (2) is provided with a spring plate (8) whose end extends to and is arranged adjacent to the raised portion (21); The spring plates (8) are arranged in a circular array and are moved by a hammer at one end of the guide rod (4).

2. A fire alarm according to claim 1, characterized in that: The spring plate (8) is arranged obliquely, and has a plurality of spring leaves (81) punched out thereon, which are bent toward the inside of the cover cover (2) and have V-shaped fork portions (82) formed at their ends.

3. A fire alarm according to claim 1, characterized in that: The spring plate (8) is in a stepped shape, and a spring leaf (81) is distributed on each step.

4. A fire alarm according to claim 1, characterized in that: It also comprises a back plate (1), wherein the protrusion (21) is inserted into a bore of a connection portion provided with the back plate (1), and is threadedly connected and fixed to the connection portion via a screw rod inserted into a recessed portion on the outer side surface of the cover cover (2).

5. A fire alarm according to claim 4, characterized in that: A dustproof net (6) is provided in the interval between the end of the covering cover (2) and the back plate (1).

6. A fire alarm according to claim 1, characterized in that: A first bevel gear (511) is fixedly disposed on the outer wall of the rotating disk (51) and is meshed with a second bevel gear (52) rotatably disposed on the mounting plate (3).

7. A fire alarm according to claim 6, characterized in that: The plurality of second bevel gears (52) are transmission-connected via a synchronous wheel (53); It also includes a driving motor mounted on the raised portion (21) and drivingly connected to the synchronous wheel (53).

8. A fire alarm according to claim 1, characterized in that: The guide rod (4) is provided with an equidistant spring (7) having one end connected to the mounting plate (3).

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