CN2769894Y

CN2769894Y - Intelligent electrostatic earthing alarm

Info

Publication number: CN2769894Y
Application number: CN 200520069396
Authority: CN
Inventors: 金道聪
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-02-28
Filing date: 2005-02-28
Publication date: 2006-04-05
Anticipated expiration: 2015-02-28

Abstract

The utility model relates to an intelligent electrostatic earthing alarm suitable for electrostatic protection of petrol stations and oil houses. The intelligent electrostatic earthing alarm comprises a housing, an earthing pile, an alarm circuit and a clamp, wherein the alarm circuit serves a single chip microcomputer as the core. One of single input-output ends is selected by the single chip microcomputer to be externally connected with a sound generator to be served as a sound alarm branch circuit, and the other two input-output ends are respectively served as a positive going input pin and an inverse input pin of an internal comparator. The alarm circuit can detect the earthing resistance value at any time. Compared with the set reference value, when the earthing resistance or the electrostatic capacity exceeds the value, the single chip microcomputer controls the sound generator to generate a sound to alarm. When the clamp fails to clamp an oil container, the sound generator can also send out the alarm to remind an operator to clamp the oil container, therefore the accident potential is avoided. Through the adjustment of in-house software, the function can be flexibly increased according to needs.

Description

Intelligence electrostatic grounding alarm

Technical field: the utility model relates to a kind of intelligent electrostatic grounding alarm, is applicable to the electrostatic protection of refuelling station, oil depot.

Background technology: traditional electrostatic grounding protective device is very simple and crude, only be to connect ground stud and carrying magnetic metal respectively to inhale piece at the lead two ends, during use metal inhaled metal that piece is adsorbed on oil containers such as vehicle body, oil tank partly, electrostatic charge is imported the earth through lead and ground stud, such protective device exists following defective: the oil container surface is if any paint or rusty scale, metal is inhaled piece and is difficult to penetrate, and contact resistance is bigger; When contact resistance and stake resistance are excessive, can not send warning, have potential safety hazard.Be 92204117.2 in the patent No., the applying date is 1992.03.09, name is called in the utility model patent of " the bad alarm of electrostatic grounding " and discloses a kind of intelligent electrostatic grounding alarm, the bad alarm of this electrostatic grounding is made up of the upright element of the integrated five equilibrium of several resistance, transistor, photoelectrical coupler and music.It is applicable to that oil, chemical industry need the industry of electrostatic prevention, and electrostatic grounding is reported to the police when being particularly useful for stock tank car can light oil.When tank car contacts when good with leading the earthing device that destatics, warning circuit is not reported to the police, otherwise then reports to the police, optoelectronic switch conducting simultaneously, to other interlock mechanism send can not can signal.This alarm has been eliminated present tank wagon when the loading and unloading oil product, and bad because of leading the device work that destatics, electrostatic accumulation makes the hidden danger of oil vapour combustion explosion.But because the bad alarm circuit of this electrostatic grounding partly adopts discrete component, therefore be difficult for debugging, performance shakiness and function singleness can't be set up function as required flexibly.

The utility model content: the purpose of this utility model is that prior art is not enough to provide a kind of debugging that is easy in order to overcome, stable performance and can set up the intelligent electrostatic grounding alarm of function as required flexibly.

For realizing the purpose of this utility model, the technical solution of taking is as follows: a kind of intelligent electrostatic grounding alarm, comprise shell, ground stud, warning circuit and clip, it is characterized in that: described warning circuit comprises single-chip microprocessor, single-chip microprocessor peripheral cell and display unit, single-chip microprocessor is chosen the external acoustical generator of one of them input/output terminal as the audible alarm branch road, other has two input/output terminals respectively as the forward input pin of internal comparator and reverse input pin, the forward input pin is connected with ground stud with clip respectively with reverse input pin, and display unit is connected with the data output of single-chip microprocessor.

The employing single-chip microprocessor is that the warning circuit of core can detect grounding resistance at any time, with the reference value contrast of setting, the reference value of setting can be decided according to different situations, when stake resistance or static content overflow, single-chip microprocessor control acoustical generator sounding alarm fails to clamp well on the oil container when clip, can send warning too, remind the operator to clip again, avoided accident potential; Because of single-chip microprocessor has a plurality of input/output terminals, as increase some relevant detection circuit,, just can set up function as required flexibly by adjustment in house software; As when in intelligent electrostatic grounding alarm, setting up battery flowmeter charge circle, can also monitor battery electric quantity, and the result is shown on display unit.

Below in conjunction with accompanying drawing the utility model is further elaborated, provides embodiment simultaneously.

Description of drawings:

Fig. 1 is the utility model embodiment shell synoptic diagram;

Fig. 2 is the example structure synoptic diagram;

Fig. 3 is the warning circuit electrical schematic diagram;

Fig. 4 is a single-chip microprocessor control flow block diagram.

Specific embodiment: as Fig. 1, shown in Figure 2, intelligence electrostatic grounding alarm is provided with shell, shell is made of cabinet 6 and case lid 2, LCD display 9 and handle 1 are located on the case lid 2, cabinet 6 and case lid 2 are stamped to form by galvanized sheet, warning circuit places host box 3, host box 3 is fixed on cabinet 6 inwalls, warning circuit is connected with clip 4 through two core RVV 5, cabinet 6 is fixed on the wall by nut 7 and bolt 8, as shown in Figure 3, it is the 16F72 microprocessor that the single-chip microprocessor IC1 of warning circuit selects model for use, display unit adopts LCD display 9 to help reducing power consumption, single-chip microprocessor IC1 chooses input/output terminal RA5, external acoustical generator BELL is as the audible alarm branch road between the RB0, input/output terminal RB6 and RB7 are respectively as the forward input pin of internal comparator and reverse input pin, the forward input pin is connected with ground stud with clip 4 respectively with reverse input pin, data output RC0～RC7 of display unit and single-chip microprocessor IC1, RB1～RB3 and RA2 are connected with RA4, intelligence electrostatic grounding alarm also is provided with battery flowmeter charge circle, battery flowmeter charge circle is by the resistance R 1 that is connected on the battery supply two ends successively, variable resistor VR2 and resistance R 2 are formed, and the sliding end that becomes of variable resistor VR2 is connected with the input end RA0 of single-chip microprocessor IC1.

Intelligence electrostatic grounding alarm work principle: single-chip microprocessor IC1 detected automatically in per 0.5 second external ground resistance value, battery electric quantity and with the inner setting value relatively, when input value greater than inner setting value or battery electric quantity during less than the inner setting value output pin RA5, RB0 output spike train make external loudspeaker BELL send chimes of doom and report to the police, and at any time the result is transported to LCD display 9 and shows.

Claims

1, a kind of intelligent electrostatic grounding alarm, comprise shell, ground stud, warning circuit and clip, it is characterized in that: described warning circuit comprises single-chip microprocessor (IC1), single-chip microprocessor (IC1) peripheral cell and display unit, single-chip microprocessor (IC1) is chosen the external acoustical generator of one of them input/output terminal (BELL) as the audible alarm branch road, other has two input/output terminals respectively as the forward input pin of internal comparator and reverse input pin, the forward input pin is connected with ground stud with clip (4) respectively with reverse input pin, and display unit is connected with the data output of single-chip microprocessor (IC1).

2, intelligent electrostatic grounding alarm according to claim 1 is characterized in that: described display unit adopts LCD display (9), and single-chip microprocessor (IC1) model is 16F72, and oppositely input pin is (RB7), and the forward input pin is (RB6).

3, intelligent electrostatic grounding alarm according to claim 1 and 2, it is characterized in that: described intelligent electrostatic grounding alarm also is provided with battery flowmeter charge circle, battery flowmeter charge circle is made up of the resistance that is connected on the battery supply two ends successively (R1), variable resistor (VR2) and resistance (R2), and the sliding end that becomes of variable resistor (VR2) is connected with an input end of single-chip microprocessor (IC1).