CN2144839Y

CN2144839Y - Harmful gas safety alarm helmet

Info

Publication number: CN2144839Y
Application number: CN 92232416
Authority: CN
Inventors: 冯文渊
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-08-31
Filing date: 1992-08-31
Publication date: 1993-10-27
Anticipated expiration: 2002-08-31

Abstract

The utility model provides a safety helmet which can monitor and alarm for the harmful gases, comprising a helmet, an inner sleeve, a tied rope and an electronic monitoring and alarm system. The safety helmet slickly installs a buzzer at the two auricle positions of the plastic helmet. A light-emitting diode is installed below a front ledge. An alarm printed circuit board is installed on the forehead position of the helmet. The alarm printed circuit board can effectively achieve the alarm for the superstandard harmful gases. The utility model can overcome the false alarm phenomenon caused by the environmental factors of the large noise, uneven distribution of the harmful gases, etc. The utility model has the advantages of novel design and high reliability. The utility model is the safety guarantee of the working personnel who contact the harmful gases in the chemical industry, the metallurgy and the mine.

Description

Harmful gas safety alarm helmet

The utility model relates to a kind of helmet that monitoring harmful gases is reported to the police that is used for, and is chemical industry, metallurgy, the on-the-spot a kind of security alarm cap that uses of mining activity.

Existing security protection cap, main effect are when head suffers that external object is hit, to protect head safety.This safety helmet is many to be made up of the helmet, neck bush, tether etc., and safeguard function is single.

For the security alarm of harmful gas, adopt special-purpose monitoring alarm or alarm mostly.The 2000 serial monitoring harmful gases alarms that Shanghai electro-optical device factory produces are exactly CO in the special monitoring air, H ₂S, SO ₂, NO, NO ₂, Cl ₂, the miniature instrument of harmful gas concentrations such as HCL, HCN can be carried, and manipulates whenever and wherever possible.In working at the scene, we find, because the harmful gas skewness, on-the-spot noise and other such environmental effects, fixing or portable monitoring alarm is when dangerous situation is reported to the police, and often unmanned the discovery all has poisonous gas poisoning or deadly human life phenomenon to take place every year.

The purpose of this utility model provides a kind of harmful gas security alarm cap, and monitoring harmful gases warning system and safety helmet are combined as a whole, and can wear worker's protection of this crash helmet to each.

Harmful gas security alarm cap is the same with other safety helmet, is by outer helmet (4), neck bush (interior helmet) (8), and the protection rope in the interior helmet is hung limit (9) and formed.Its improvement is, 1) cavity (5) swells at helmet forehead position outside, interior dress electronic monitoring alarm circuit system, outer dress detector probe (1), 2) the hindbrain position of helmet (4) outside, swell a cavity (6), but internal electric source, 3) light emitting diode (7) is equipped with in the preceding eaves inboard of helmet (4) outside, 4) left and right sides of helmet (4) outside is equipped with buzzer (2), 5) at the top of neck bush (8) moving contact (10) is housed, the inner top of helmet (4) is equipped with and decides contact (3) outside, and two contacts have constituted power switch.6), have voice guide hole (11) in the and arranged on left and right sides of neck bush (8).

The electrical principle of electronic monitoring warning system is, it is by detecting bridge circuit (12), amplifier (13), putting ripple generation and threshold value setting circuit (14), and delay trigger circuit (15), comparer (16), warning circuit (17), mu balanced circuit (18), high-low pressure intersection loop power supply circuit (19) are formed.

Bridge detection circuit (12) is made up of gas sensor and resistance.Mainly finish the conversion of harmful gas → electricity.When harmful gas and gas sensor (probe 1) when contacting, will cause the drop significantly of this sensitive element resistance, concentration is big more, and resistance is more little, and on 2 end points of symmetric arms of bridge detection circuit, the deviation voltage of generation is also big more, and this voltage is through IC ₁_ ₁Behind the linear amplification, deliver to comparer IC ₁_ ₂An input end.

IC ₁_ ₃Constitute square-wave oscillator with relevant Resistor-Capacitor Unit, its frequency is 1-10HZ, and crest voltage can rationally be set up (threshold values) according to setting requirement, is directly coupled to comparer IC then ₁～ ₂Another input end.

Consider that gas sensor when energising just, has an erratic process, so after comparer, designed a delay trigger circuit, its delay time is roughly between 3-7 minute, to prevent false alarm.

Warning circuit is by ic chip ₃Constitute.Adopt HFC9561A, once triggering, buzzer can send police whistle sound, two light emitting diodes warning of also will glimmering simultaneously.

For sustaining voltage is stable, limit dissipation power is by IC ₁～ ₄Form the voltage stabilizing power supply,, prolong battery serviceable life to save electric energy.

Because gas sensor at high temperature, very inresponsive to harmful gas, and the desorption cleanup action arranged, for this element is worked under optimum Working, adopt high low temperature intersection circulation heating work mode, promptly high pressure (5V) heated wash is 60 seconds, low pressure (2V) work test circulation in 30 seconds is carried out, in order to playing one's part to the full, so after stabilized voltage supply, insert an intersection loop power supply circuit IC ₄To realize its requirement.

After energized, square wave generation IC circuit ₁_ ₃To constantly produce the square-wave signal of 1～10HZ, through comparer, the output flashing signal, indication circuit is normal.

The deviation voltage of (can artificially set up) its detection bridge output when gas concentration in the environment surpasses maximum safe limit is through IC ₁_ ₁Amplify and comparer relatively after, IC ₁_ ₂Constant high level is exported in full conducting, triggers through delay circuit, makes warning circuit work, sends the sound and light alarm signal, reminds the site operation personnel to note.

Because harmful gas security alarm cap is that everyone wears one, the warning buzzer is contained in again in one's ear, and therefore, the personnel casualty accidents that the noise in the scene and harmful gas unevenness are caused all can overcome.

The utility model hits the advantage except that having the anti-of other safety helmet, has increased the harmful gas warning function that exceeds standard, vast usable range.

Description of drawings:

Fig. 1 is 45 ° of vertical views of the utility model side direction

Fig. 2 is 45 ° of upward views of the utility model side direction

Fig. 3 is the utility model forward front elevation

Fig. 4 is that liner side is to 45 ° of vertical views

Fig. 5 is the utility model electrical schematic diagram

Embodiment:

Outer helmet is selected the plastic material manufacturing for use, forehead, hindbrain, and arranged on left and right sides be needed the ridge one-shot forming, keeps helmet smooth in appearance.

Neck bush (interior helmet) can be selected light plastic for use.All electron devices all can the hidden ridge of helmet outside and neck bush between.Outer helmet can be in the same place with sticker or snap lock with liner.

Probe (being mainly gas sensor) is being adorned in the outside of helmet forehead position protuberance, and electronic monitoring warning electronic system is being adorned in the inboard.In the room of helmet hindbrain position protuberance, power supply is housed.Light emitting diode (7) is equipped with in eaves inboard before the helmet.At helmet and arranged on left and right sides auricle position, buzzer is housed.Moving contact is equipped with at top at interior helmet, and the helmet inner top is equipped with and decides contact outside, and two contacts have constituted power switch.And arranged on left and right sides at interior helmet leaves voice guide hole.

Its electronic alarm circuit system is a (see figure 5), it by detect bridge circuit, amplifier, square wave takes place intersects loop power supply circuit with threshold value setting circuit, delay trigger circuit, comparer, warning circuit, mu balanced circuit, high-low pressure and form.

In the circuit, ic chip ₁Select LM324 for use, IC ₂Select μ A555, IC ₃Select HFC9561A, IC ₄Select μ A555.

The course of work: operator, put on harmful gas security alarm cap, move, decide the contact contact, connected power supply, gas-sensing probe begins to preheat, after 5～10 seconds, delay circuit is opened, and accepts and output level, delivers to the comparison amplifying circuit, by with the comparison of threshold level, amplitude limit, export to warning circuit.In environment, when harmful gas concentration surpassed safety standard, the gas sensor impedance sharply changed, and electric bridge is unbalance, and variable signal is delivered to the comparison amplifying unit, and with threshold level relatively after, the output electric signal, directly driving sound, light are reported to the police.In environment, when harmful gas concentration was no more than threshold level, amplifying circuit output signal not relatively can appearance sound, light reports to the police.

Claims

1, a kind of harmful gas security alarm cap, it comprises the helmet (4), neck bush (8), protection rope extension limit (9) and electronic monitoring warning system, it is characterized in that:

1) cavity (5), interior dress electronic alarm circuit system are swelled in helmet (4) forehead position outside, adorn detector probe (1) outward,

2) cavity (6) is swelled at the hindbrain position of helmet (4) outside, internal electric source,

3) light emitting diode (7) is equipped with in the preceding eaves inboard of helmet (4) outside,

4) buzzer (2) is equipped with in the left and right sides of helmet (4) outside,

5) at the top of neck bush (8) moving contact (10) is housed, the inner top of helmet (4) is equipped with and decides contact (3) outside, and two contacts constitute power switch,

6) in the left and right sides of neck bush (8), have voice guide hole (11),

7) electronic monitoring warning system, it includes comparer (16), two input ends at comparer (16), one termination monitoring bridge circuit (12) and amplifier (13), another termination square wave threshold value setting circuit (14), the output termination delay trigger circuit (15) of comparer, delay trigger circuit output terminal circuit taking alarm (17), warning circuit (17) is circumscribed with sound and light display spare buzzer (2), light emitting diode (7), in addition, warning system also has mu balanced circuit (18), provide stabilized voltage supply, in mu balanced circuit, also be connected to high-low pressure intersection loop power supply circuit (19), gas sensor (1) powered in the mode that high-low pressure replaces.

2, harmful gas security alarm cap according to claim 1, it is characterized in that: bridge detection circuit (12) is made up of gas sensor (1) and resistance, and amplifier (13) is by integrated circuit modules IC ₁- ₁Constitute, comparer (16) is by integrated circuit modules IC ₁- ₂Constitute, square-wave oscillator (14) is by integrated circuit modules IC ₁- ₃Constitute with relevant Resistor-Capacitor Unit, its oscillation frequency is 1～10HZ, and delay trigger circuit (15) is by integrated circuit modules IC ₂Constitute, warning circuit (17) is by integrated circuit modules IC ₃, constituting, mu balanced circuit (18) is by integrated circuit modules IC ₁- ₄Constitute, intersect loop power supply circuit by integrated circuit modules IC ₄Constitute.

3, according to claim 1 or 2 described security alarm caps, it is characterized in that: integrated circuit modules IC ₁Select LM324, integrated circuit modules IC for use ₂Select μ A555 for use, integrated circuit modules.IC ₃Select HFC9561A for use, integrated circuit modules IC ₄Select μ A555 for use.