CN201146295Y

CN201146295Y - Antistatic hand loop earthing socket with alarm device

Info

Publication number: CN201146295Y
Application number: CNU2007201317495U
Authority: CN
Inventors: 张庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-12-19
Filing date: 2007-12-19
Publication date: 2008-11-05
Anticipated expiration: 2017-12-19

Abstract

The utility model relates to an antistatic wrist trap earthing socket with an alerting device, which belongs to the field of technology of electronics. The product comprises a socket panel, a monitoring circuit, and a power; an earthing jack is installed on the socket panel; an earthing end of the earthing jack is earthed; the monitoring circuit comprises a dispersion gate circuit, wherein, an input end of the dispersion gate circuit is electrically connected with an non-earthing end of the earthing jack; an output end of the dispersion gate circuit is connected with the anode of the power by a switch tube and an alerting component, the input end of the dispersion gate circuit is also connected with the anode of the power by a bypass resistor. The antistatic wrist trap earthing socket has the advantage that a monitoring and an alerting of the earthing state of an antistatic facility are realized by the simple and reasonable structure, thus effectively avoiding an occurrence of a static puncturing accident and guaranteeing a normal production of a precise and precious component and an integrated circuit.

Description

The antistatic bracelet grounding receptacle of band warning device

Technical field

The utility model relates to a kind of electronic product, and specifically a kind of antistatic bracelet grounding receptacle with warning device belongs to electronic technology field.

Background technology

At present, in electronic product manufacturing enterprise, accurate valuable components and parts, the damage of integrated circuit, inefficacy main cause is electrostatic breakdown.For fear of electrostatic breakdown, antistatic ultra-clean workshop has taked various measures to eliminate static.One of its measure is except wearing antistatic clothing, also to require the operator to wear the antistatic bracelet and eliminate the static electricity on human body.

Traditional anti-static precautions is that the workman is worn on the bracelet of being made by the conduction elastic cord on the wrist, and guarantees that bracelet contacts fully with skin, and lead on the bracelet and grounding system are connected, and carries out static electricity on human body's discharging, reaches the purpose of eliminating static.But, in actual production process, often run into following problem: because workman's operational motion continually, lead on the bracelet very easily fractures, if fractureing, lead occurs between twice routine inspection, the static that human body produces is easy to cause the damage of precision components, integrated circuit, and product percent of pass is declined to a great extent.In addition, because production intensity is big, the workman can not correctly wear bracelet sometimes, can't guarantee that bracelet reliably contacts with skin, also can cause protection to lose efficacy.

The appearance of above situation has reduced production efficiency, causes the significant wastage of human and material resources.Cause protection to lose efficacy in order to prevent that lead on the bracelet from fractureing, usually formulate the inspection procedure specification of antistatic bracelet in the enterprise, whether and it is intact to make regular check on lead, other has part enterprise even high price to buy import high-quality lead bracelet, and such measure can only be played the passive effect that prevents, still can not prevent the appearance of above-mentioned situation well.

The utility model content

The purpose of this utility model is: the problem that can only passively prevent electrostatic breakdown at present electronics manufacturing enterprise, propose a kind of antistatic bracelet grounding receptacle of the band warning device that can monitor antistatic facility ground state, thereby effectively avoid electrostatic breakdown to take place unexpectedly.

In order to reach above purpose, the antistatic bracelet grounding receptacle of the utility model band warning device comprises socket panel, observation circuit and power supply; On the described socket panel earth jack is housed, the earth terminal ground connection of described earth jack; Described observation circuit contains NAND gate circuit, and the input of described NAND gate circuit is electrically connected with the non-earth terminal of earth jack, and output connects positive source through alarm appliance; The input of described NAND gate circuit also connects described positive source through bypass resistance.It is that the output of described NAND gate circuit also connects positive source by switching tube and through buzzer that the utility model further improves.

When the antistatic bracelet inserts earth jack, if the operator is according to the regulation of operational procedure, correctly be worn on the antistatic bracelet on the wrist, because the conduction elastic cord on the two-wire antistatic bracelet closely contacts with skin, the skin contact resistance is lower than 20 megohms, and this moment, the NAND gate input was a low level still, and output is a high level, switching tube is in cut-off state, and alarm appliance is not reported to the police.At this moment, owing to the lead on the two-wire bracelet is connected by the ground wire of jack and circuit, and ground wire is connected by earth terminal and the earth, reaches the static electricity on human body's that releases purpose.

If the operator does not have the regulation according to operational procedure, correctly be worn on two-wire antistatic bracelet on the wrist, to cause the resistance value between bypass resistance and the ground to surpass the normal contact resistance value of human body skin, the static electricity on human body can not normally release as a result, the NAND gate input is a high level, and output becomes low level, and switching tube is in conducting state, alarm appliance sounding alarm signal, the prompting user corrects immediately.

This shows that the utility model has been realized monitoring and warning to antistatic facility ground state with the structure of advantages of simple, thereby effectively avoids electrostatic breakdown to take place unexpectedly, guarantees the ordinary production of accurate valuable components and parts, integrated circuit.

Description of drawings

Below in conjunction with accompanying drawing the utility model is further described.

Fig. 1 is the Facad structure schematic diagram of an embodiment of the utility model.Each sign with the corresponding relation of part is among the figure: 1. earth jack, 2. test button, 3.LED indicator light, 5. solar silicon photovoltaic cell, 7. grounding receptacle panel.

Fig. 2 is the rearview of Fig. 1.Each sign with the corresponding relation of part is among the figure: 4. grounding system binding post, 6. support mounting groove.

Fig. 3 is the three-dimensional view of Fig. 2.Each sign is identical with corresponding relation and Fig. 2 of part among the figure.

Fig. 4 is circuit theory diagrams of the present utility model.CK1 and CK2 are that earth jack, C1 and C2 are that electric capacity, K1 are for checking that switch, T1 are that switching tube, FMQ are that buzzer, B1 and B2 are respectively solar cell and chargeable lithium battery among the figure.

Embodiment

Embodiment one

Grow 38 millimeters with the antistatic bracelet grounding receptacle of present embodiment band warning device, wide 58 millimeters, high 40 millimeters.Supporting with it two-wire antistatic bracelet market is on sale.

As Fig. 1, Fig. 2 and shown in Figure 3, LED light 3,

earth jack

1 and 7, solar silicon photovoltaic cell 5 and test button 2 are located at the front of socket panel 7 respectively, and grounding system binding post 4 is located at the back side of panel 7.Can be fixed in desired location by support mounting groove 6.

Its internal monitoring circuit as shown in Figure 4, the earth terminal of two earth jack CK1, CK2 is ground connection respectively.The input of first order NAND gate circuit IC1, the IC2 of two parallel connections is electrically connected with the non-earth terminal of corresponding earth jack CK1, CK2 respectively, two outputs meet two batteries in parallel connection B1, B2 by LED 1, LED2 respectively, and (one of them is a rechargeable battery, another is a solar cell) positive pole, two outputs also connect the input of second level not circuit IC3 simultaneously, and the output of this second level not circuit IC1 connects positive source by switch transistor T 1 and through the buzzer FMQ as alarm appliance.The input of two first order NAND gate circuit also connects positive source through bypass resistance R2, R5 respectively.More reliable in order to work, and maintain easily, be connected to capacitor C 1, C2 between the two ends of two earth jacks respectively; Between first order NAND gate circuit input and output side, be provided with and check K switch 1.

During use, present embodiment can be installed in above or below the work top of production line, particular location is suitable not influence being operating as of workman, is connected with the grounding system of workshop with the ground connection binding post 4 of lead with the embodiment rear portion, and screws down.

During work, the workman correctly is worn on antistatic two-wire bracelet on the wrist, and with among its plug insertion earth jack CK1 or the CK2, because the skin contact resistance is lower than 20 megohms, the 1st, 2 pin and the 5th, 6 pin of NAND gate CD4011 are low level, 3rd, 4 pin are high level, LED1 and LED2 indicator light do not work, switch transistor T 1 is in off-state, buzzer FMQ is sounding not, lead on the two-wire bracelet is connected by the ground wire that jack 1 is connected to CK1 or CK2 and circuit, and ground wire is connected by earth terminal and the earth, reaches the static electricity on human body's that releases purpose.

If the workman does not correctly wear bracelet, or the lead of bracelet is when fractureing, and the lower end of resistance R 2 or R5 and the resistance value between the ground surpass the normal contact resistance value of human body skin, and its consequence is that the static electricity on human body can not normally release.This moment, the 1st, 2 pin or the 5th, 6 pin of first order NAND gate CD4011 were high level, 3rd, 4 pin are low level, LED1 or LED2 indication are bright, make switch transistor T 1 be in conducting state through second level NAND gate, buzzer FMQ sounding alarm, the prompting user corrects immediately and wears or change the bracelet line that has fractureed.

When in specified period, checking whether observation circuit is in normal operating conditions, press when checking K switch 1, the 1st, 2 pin and the 5th, 6 pin of NAND gate CD4011 are high level, therefore the 3rd, 4 pin are low level, LED1 and LED2 indicator light are bright, switch transistor T 1 is in conducting state, buzzer FMQ sounding.Can verify that thus observation circuit all is in normal monitoring state, warning function is normal.

The utility model adopts low-power consumption NAND gate CD4011 integrated circuit, during monitoring state, power consumption is less than 1 microampere, under the normal illumination of electronic assemblies workshop (more than 400 Luxs), use non-crystalline silicon photocell to be enough to guarantee power supply, simultaneously can be to chargeable group of button lithium cell charging, satisfy the electric power that when alarm condition operating current is about 30 milliamperes and supply with.Therefore this product can use for a long time, need not to change battery.

In addition to the implementation, the utility model can also have other execution modes, for example uses 1 farad capacitor to replace chargeable lithium coin cells, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection range of the utility model requirement.

Claims

1, a kind of antistatic bracelet grounding receptacle with warning device comprises socket panel, observation circuit and power supply; It is characterized in that: on the described socket panel earth jack is housed, the earth terminal ground connection of described earth jack; Described observation circuit contains NAND gate circuit, and the input of described NAND gate circuit is electrically connected with the non-earth terminal of earth jack, and output connects positive source through alarm appliance; The input of described NAND gate circuit also connects described positive source through bypass resistance.

2, antistatic bracelet according to claim 1 grounding receptacle is characterized in that: the output of described NAND gate circuit also connects positive source by switching tube and through buzzer.

3, antistatic bracelet according to claim 2 grounding receptacle is characterized in that: described earth jack contains two, and described NAND gate circuit contains two-stage; The input of two NAND gate circuit in parallel of the first order is electrically connected with the non-earth terminal of corresponding earth jack respectively, two outputs connect the positive pole of battery respectively by light-emitting diode, two outputs also connect the input of second level not circuit simultaneously, and the output of described second level not circuit connects positive source by switching tube and through buzzer.

4, antistatic bracelet according to claim 3 grounding receptacle is characterized in that: described battery is chargeable lithium cell and solar cell in parallel.

5, antistatic bracelet according to claim 4 grounding receptacle is characterized in that: be connected to electric capacity between the two ends of described two earth jacks respectively.

6, antistatic bracelet according to claim 5 grounding receptacle is characterized in that: be provided with the inspection switch between the input and output side of described first order NAND gate circuit.