Explosion-proof electric bell

Abstract

The invention discloses an explosion-proof electric bell. According to the technical scheme, the anti-explosion bell comprises a base, a shell arranged on the base and a bell bowl arranged above the shell, the shell is provided with an anti-explosion knocking mechanism assembly used for knocking the bell bowl, and the anti-explosion knocking mechanism assembly comprises a motor and a first anti-explosion shaft sleeve arranged on an output shaft of the motor in a sleeving mode. A mounting plate is arranged at the lower end of the first explosion-proof shaft sleeve, a mounting frame is arranged at the upper end of the first explosion-proof shaft sleeve, a first screw connected with the motor and a second screw connected with the shell are arranged on the mounting plate, and movable metal knocking rings are arranged at the two ends of the mounting frame through fixing shafts; the anti-explosion bell has the advantages that the direct-current motor is adopted to drive the two metal knocking rings to knock the bell bowl to find sound, the direct-current motor is not prone to generating electric arcs, and the anti-explosion shell structure is combined, so that the anti-explosion performance is better.

Description

Technical Field

[0001] The invention belongs to the field of explosion-proof equipment, and in particular relates to an explosion-proof electric bell. Background Art

[0002] Explosion-proof electric bell is a special electric bell used in flammable and explosive places (such as mines). It has special functions such as explosion-proof and fire-proof, which can ensure safe use in dangerous environments. Traditional explosion-proof electric bells include: a flameproof shell, a bell bowl and an electromagnetic system installed on the flameproof shell. The electromagnetic system is the core part of the bell action, which includes an electromagnet and a coil. The electromagnet controls the bell hammer to strike the bell bowl to make a sound through electromagnetic attraction. The disadvantages are: 1. The electromagnetic system is prone to arcing and has poor explosion-proof performance, which raises higher requirements for the performance of the flameproof shell; 2. The electromagnetic system has a short service life; 3. The integration is poor and the assembly is troublesome. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an explosion-proof electric bell.

[0004] In order to solve the above problems, the technical solution adopted by the present invention includes: a base, a shell arranged on the base and a bell bowl arranged above the shell, and is characterized in that: an explosion-proof knocking mechanism assembly for knocking the bell bowl is provided on the shell, and the explosion-proof knocking mechanism assembly includes a motor and a first explosion-proof sleeve sleeved on the output shaft of the motor, a mounting plate is provided at the lower end of the first explosion-proof sleeve, and a mounting frame is provided at the upper end, a first screw connected to the motor and a second screw connected to the shell are provided on the mounting plate, and movable metal knocking rings are provided at both ends of the mounting frame through a fixed shaft, and a second explosion-proof sleeve is integrally formed on the shell, and the first explosion-proof sleeve extends from the second explosion-proof sleeve and fits tightly therewith.

[0005] The explosion-proof electric bell is characterized in that the metal sleeve on the fixed shaft and the metal striking ring have an aperture R1 that is larger than an outer diameter R2 of the metal sleeve.

[0006] The explosion-proof electric bell is characterized in that: the mounting frame consists of a lower mounting frame and an upper mounting frame, the fixed shaft is integrally formed at both ends of the lower mounting frame, and a spherical buckle is integrally formed on the top of the fixed shaft, grooves are provided at both ends of the upper mounting frame, and a spherical groove connected to the spherical buckle is provided on the groove, and the diameter R3 of the spherical groove is smaller than the outer diameter R4 of the spherical buckle.

[0007] The explosion-proof electric bell is characterized in that a square portion is provided at the upper end of the output shaft, and the lower mounting frame and the upper mounting frame are fixed on the square portion and fixed by nuts.

[0008] The explosion-proof electric bell is characterized in that the locking direction of the nut is the same as the direction of rotation of the output shaft of the motor.

[0009] The explosion-proof electric bell is characterized in that the bell bowl is made of carbon steel, and the inner wall is plated with a beryllium bronze layer, and the metal shaft sleeve and the metal striking ring are both made of beryllium bronze.

[0010] The explosion-proof electric bell is characterized in that: a third explosion-proof shaft sleeve is provided on the mounting plate and is sleeved on the first explosion-proof shaft sleeve and fixed by a fourth screw, and the top of the third explosion-proof shaft sleeve is against the inner wall of the shell.

[0011] The explosion-proof electric bell is characterized in that an explosion-proof flange embedded in the shell is provided on the base, and the height of the explosion-proof flange is not less than 1.5 cm.

[0012] The explosion-proof electric bell is characterized in that the bell bowl is mounted on the support rod at the top of the shell and fixed by a third screw, a spring is sleeved on the lower end of the third screw, the lower end of the spring abuts against the support rod and the upper end abuts against the bell bowl, so that the bell bowl is floatingly arranged above the shell.

[0013] The explosion-proof electric bell is characterized in that a grounding plate is provided on the base.

[0014] The advantages of the explosion-proof electric bell of the present invention are: 1. A DC motor is used to drive two metal striking rings to strike the bell bowl to produce sound. Since the DC motor itself is not easy to generate electric arcs, and combined with the explosion-proof shell structure, its explosion-proof performance is better and its service life is longer; 2. The explosion-proof striking mechanism assembly has high integration and is easy to assemble; 3. The sound is louder and crisper.

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the explosion-proof electric bell of the present invention; Figure 2 It is an exploded view of the explosion-proof electric bell of the present invention; Figure 3 is a cross-sectional view of an explosion-proof electric bell of the present invention; Figure 4 It is a structural schematic diagram of the explosion-proof knocking mechanism assembly of the present invention; Figure 5 Is a cross-sectional view of the explosion-proof percussion mechanism assembly of the present invention; Figure 6 It is a partial cross-sectional view of the explosion-proof striking mechanism assembly of the present invention. DETAILED DESCRIPTION

[0017] like Figures 1 to 6As shown, the explosion-proof electric bell of the present invention comprises a base 1, a shell 2 arranged on the base 1 and a bell bowl 3 arranged above the shell 2. The base 1 and the shell 2 are fixed by a set of screws. The base 1 and the shell 2 are usually made of cast steel or aluminum alloy. The shell 2 is provided with an explosion-proof knocking mechanism assembly 4 for knocking the bell bowl 3. The explosion-proof knocking mechanism assembly 4 comprises a motor 5 and a first explosion-proof sleeve 7 sleeved on the output shaft 6 of the motor 5. The first explosion-proof sleeve 7 is usually made of copper. A mounting plate 8 is provided at the lower end of the first explosion-proof sleeve 7, and a mounting frame 9 is provided at the upper end of the first explosion-proof sleeve 7. The mounting plate 8 is provided with a first screw 10 connected to the motor 5 and a second screw 11 connected to the shell 2. The mounting plate 8 and the first explosion-proof sleeve 7 can be fixed by a fourth screw 27, or can be integrally formed. Both ends of the mounting frame 9 are provided with movable metal knocking rings 13 through a fixed shaft 12. The shell 2 is integrally formed with a second explosion-proof sleeve 21, and the first explosion-proof sleeve 7 extends from the second explosion-proof sleeve 21 and fits closely therewith to achieve an explosion-proof effect. The height of the second explosion-proof sleeve 21 is ideally 1-2 cm. A cable stuffing box 28 is provided on one side of the shell 2, and the cable stuffing box can fill the gap inside the cable to play an explosion-proof role. During assembly: first, the output shaft 6 of the motor 5 is installed through the first explosion-proof sleeve 7 and the mounting plate 8, and then the motor 5 is fixed to the mounting plate 8 through the first screw 10, and then the mounting plate 8 is fixed to the bottom of the bell bowl 3 through the second screw 11, and finally installed into the mounting frame 9. The metal knocking ring 13 is pre-installed on both ends of the mounting frame 9. In order to achieve the knocking of the metal knocking ring 13 and the bell bowl 3, the explosion-proof knocking mechanism assembly 4 needs to be eccentrically installed on the shell 2.

[0018] Preferably, the metal sleeve 14 sleeved on the fixed shaft 12 and the aperture R1 of the metal striking ring 13 are larger than the outer diameter R2 of the metal sleeve 14. By providing the metal sleeve 14, in addition to improving the strength of the fixed shaft 12, it is easier for the metal striking ring 13 to rebound after being hit, thereby achieving the effect of the bell bowl 3 being struck at high frequency multiple times, and after being hit, the metal striking ring 13 itself will also make a sound due to vibration, thereby making the sound louder and crisper.

[0019] Preferably, the mounting frame 9 is composed of a lower mounting frame 901 and an upper mounting frame 902, the fixed shaft 12 is integrally formed at both ends of the lower mounting frame 901, and a spherical buckle 15 is integrally formed on the top of the fixed shaft 12. Grooves 16 are provided at both ends of the upper mounting frame 902, and a spherical groove 17 connected to the spherical buckle 15 is provided on the groove 16, and the diameter R3 of the spherical groove 17 is smaller than the outer diameter R4 of the spherical buckle 15. Usually, the lower mounting frame 901 and the upper mounting frame 902 are made of plastic. During assembly: first, the metal sleeve 14 and the metal knocking ring 13 are sequentially installed into the fixed shaft 12 of the lower mounting frame 901, and then installed into the upper mounting frame 902, and finally the spherical buckle 15 is forced into the spherical groove 17 to achieve quick connection.

[0020] Preferably, a square portion 18 is provided at the upper end of the output shaft 6, and the lower mounting frame 901 and the upper mounting frame 902 are fixed on the square portion 18 and fixed by a nut 19. Usually, a square groove adapted to the square portion 18 is provided on the lower mounting frame 901 and the upper mounting frame 902, so that when the output shaft 6 rotates, the lower mounting frame 901 and the upper mounting frame 902 can be driven to rotate synchronously.

[0021] Preferably, the locking direction of the nut 19 is the same as the direction of the output shaft 6 of the motor 5, so that when the motor 5 rotates, the nut 19 can be locked to prevent loosening.

[0022] Preferably, the bell bowl 3 is made of carbon steel, and the inner wall is plated with a beryllium bronze layer 20, and the metal sleeve 14 and the metal knocking ring 13 are both made of beryllium bronze (a copper alloy with beryllium as the main alloying element, which has the characteristics of high strength, high elasticity, good wear resistance and corrosion resistance, and the beryllium content of beryllium bronze is usually between 1.7% and 2.5%). The bell bowl 3 is made of carbon steel to improve the crispness of the sound, and the beryllium bronze layer 20 is provided and the metal knocking ring 13 and the metal sleeve 14 are made of beryllium bronze to prevent sparks from being generated during impact.

[0023] Preferably, the mounting plate 8 is provided with a third explosion-proof sleeve 29 sleeved on the first explosion-proof sleeve 7 and fixed by a fourth screw 27, and the top of the third explosion-proof sleeve 29 abuts against the inner wall of the housing 2, so as to further improve the explosion-proof performance of the housing 2 and also further improve the strength of the mounting plate 8.

[0024] Preferably, the base 1 is provided with an explosion-proof flange 22 embedded in the shell 2, and the height of the explosion-proof flange 22 is not less than 1.5 cm. The height of the explosion-proof flange 22 is ideally 2 cm to further improve the explosion-proof performance of the shell 2.

[0025] Preferably, the bell bowl 3 is mounted on the support rod 23 at the top of the housing 2 and fixed by a third screw 24. A spring 25 is sleeved on the lower end of the third screw 24. The lower end of the spring 25 abuts against the support rod 23 and the upper end abuts against the bell bowl 3, so that the bell bowl 3 is floatingly arranged above the housing 2. By setting the bell bowl 3 to float, it can vibrate more freely and produce a louder sound.

[0026] Preferably, a grounding sheet 26 is provided on the base 1 to ensure electrical safety, prevent static electricity accumulation, and thus improve explosion-proof performance.

[0027] 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 are included in the protection scope of the present invention.

Claims

1. An explosion-proof electric bell, comprising a base (1), a shell (2) arranged on the base (1), and a bell bowl (3) arranged above the shell (2), characterized in that: The shell (2) is provided with an explosion-proof striking mechanism assembly (4) for striking the bell bowl (3), the explosion-proof striking mechanism assembly (4) comprising a motor (5), a first explosion-proof shaft sleeve (7) sleeved on an output shaft (6) of the motor (5), a mounting plate (8) being provided at the lower end of the first explosion-proof shaft sleeve (7), and a mounting frame (9) being provided at the upper end, the mounting plate (8) being provided with a first screw (10) connected to the motor (5) and a second screw (11) connected to the shell (2), movable metal striking rings (13) being provided at both ends of the mounting frame (9) via a fixed shaft (12), a second explosion-proof shaft sleeve (21) being integrally formed on the shell (2), the first explosion-proof shaft sleeve (7) extending from the second explosion-proof shaft sleeve (21) and being tightly fitted therewith.

2. The explosion-proof electric bell according to claim 1, characterized in that: The metal sleeve (14) is sleeved on the fixed shaft (12), and the hole diameter R1 of the metal knocking ring (13) is larger than the outer diameter R2 of the metal sleeve (14).

3. The explosion-proof electric bell according to claim 1, characterized in that: The mounting frame (9) is composed of a lower mounting frame (901) and an upper mounting frame (902); the fixed shaft (12) is integrally formed at both ends of the lower mounting frame (901), and a spherical buckle (15) is integrally formed on the top of the fixed shaft (12); grooves (16) are provided at both ends of the upper mounting frame (902), and a spherical groove (17) connected to the spherical buckle (15) is provided on the groove (16); the diameter R3 of the spherical groove (17) is smaller than the outer diameter R4 of the spherical buckle (15).

4. The explosion-proof electric bell according to claim 3, characterized in that: The upper end of the output shaft (6) is provided with a square portion (18), and the lower mounting frame (901) and the upper mounting frame (902) are fixed on the square portion (18) and fixed by a nut (19).

5. The explosion-proof electric bell according to claim 4, characterized in that: The locking direction of the nut (19) is the same as the rotation direction of the output shaft (6) of the motor (5).

6. The explosion-proof electric bell according to claim 2, characterized in that: The bell bowl (3) is made of carbon steel, and the inner wall thereof is plated with a beryllium bronze layer (20); the metal shaft sleeve (14) and the metal striking ring (13) are both made of beryllium bronze.

7. The explosion-proof electric bell according to claim 1, characterized in that: The mounting plate (8) is provided with a third explosion-proof shaft sleeve (29) which is sleeved on the first explosion-proof shaft sleeve (7) and fixed by a fourth screw rod (27); the top of the third explosion-proof shaft sleeve (29) abuts against the inner wall of the housing (2).

8. The explosion-proof electric bell according to claim 1, characterized in that: The base (1) is provided with an explosion-proof flange (22) embedded in the shell (2), and the height of the explosion-proof flange (22) is not less than 1.5 cm.

9. The explosion-proof electric bell according to claim 1, characterized in that: The bell bowl (3) is mounted on a support rod (23) at the top of the housing (2) and fixed by a third screw rod (24). A spring (25) is sleeved on the lower end of the third screw rod (24). The lower end of the spring (25) abuts against the support rod (23) and the upper end abuts against the bell bowl (3), so that the bell bowl (3) is arranged to float above the housing (2).

10. The explosion-proof electric bell according to claim 1, characterized in that: A grounding plate (26) is provided on the base (1).

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