CN203572569U - Anti-opening device for electronic weighing instrument based on reflection-type infrared tube - Google Patents
Anti-opening device for electronic weighing instrument based on reflection-type infrared tube Download PDFInfo
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- CN203572569U CN203572569U CN201320497311.4U CN201320497311U CN203572569U CN 203572569 U CN203572569 U CN 203572569U CN 201320497311 U CN201320497311 U CN 201320497311U CN 203572569 U CN203572569 U CN 203572569U
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- infrared tube
- tube
- resistance
- triode
- infrared
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Abstract
The utility model discloses an anti-opening device for an electronic weighing instrument based on a reflection-type infrared tube, and relates to the technical field of electronic weighing. The interior of a front housing is provided with a reflection board, and the interior of a rear housing is provided with circuits. A baffle plate is disposed between the circuits. The voltage input end Vin of one circuit is connected with one end of a first resistor, and the other end of the first resistor is connected with the base electrode of a triode. The collector electrode of the triode is connected with one end of a second resistor, and the other end of the second resistor is connected with the VCC end of a power supply. The emitter electrode of the triode is connected with the anode of the transmitting tube of the infrared tube, and the cathode of the transmitting tube of the infrared tube is grounded. A side of the transmitting tube of the infrared tube is provided with the baffle plate, and a side of the baffle plate is provided with a receiving tube of the infrared tube. The cathode of the receiving tube of the infrared tube is grounded, and the anode of the receiving tube of the infrared tube is connected with an analog-digital convertor and one end of a third resistor. The other end of the third resistor is connected with the VCC end of the power supply. The device provided by the utility model can prevent an electronic remote-control device from being added through opening the electronic weighing instrument.
Description
Technical field
The utility model relates to electronic weighing technology field, be specifically related to the electronic scale anti-open device based on reflective infrared tube.
Background technology
Electronic scale just progressively substitutes mechanical type weighing apparatus with advantages such as its high precision, high stabilities.But because interests are ordered about, some lawless persons are just installed at electronic remote controller on electronic scale, in Weighing process, weight signal are modified, and change the goods total price of being weighed, with unlawful profit-making therefrom, to enterprises and individuals, brought great economic loss.
Electronic scale is installed additional to electronic romote-controller, mainly start with a little in electronic scale inside, sensor line and three parts of sensor side, and the disguise that installs electronic romote-controller in electronic scale inside additional is strong, in electronic scale cheating case, occupy very large part.
Current scheme is generally that the mode by installing lead sealing additional guarantees that electronic scale is not opened, but now along with cheating technology development, has also produced the phenomenon of forging lead sealing, is that the anti-opening function of electronic scale becomes ornaments.
Utility model content
For the deficiency existing in prior art, the utility model object is to be to provide a kind of electronic scale anti-open device based on reflective infrared tube, can stop, by opening electronic scale, to install the phenomenon of electronic remote controller additional.
To achieve these goals, the utility model is to realize by the following technical solutions: the electronic scale anti-open device based on reflective infrared tube, comprise fore shell, back cover, reflecting plate, circuit and baffle plate, in fore shell, be provided with reflecting plate, in back cover, be provided with circuit, between circuit, be provided with baffle plate.
Described circuit comprises the first resistance, the second resistance, the 3rd resistance, triode, infrared tube power valve, infrared tube receiving tube and A-D converter, voltage input end Vin is connected with first resistance one end, the first resistance other end is connected with the base stage of triode, the collector of triode is connected with second resistance one end, the second resistance other end is connected with power supply VCC end, the emitter of triode is connected with infrared tube power valve anode, the plus earth of infrared tube power valve; Infrared tube power valve one side is provided with baffle plate, baffle plate one side is provided with infrared tube receiving tube, the plus earth of infrared tube receiving tube, infrared tube receiving tube anode is connected with A-D converter, the 3rd resistance one end respectively, and the 3rd resistance other end is connected with power supply VCC end.
The utility model installs infrared tube and AD conversion and testing circuit additional in electronic scale inside, by internal backup battery, power.When electronic scale shell closes, infrared tube receiving tube can receive the infrared ray that power valve sends.When shell is opened, produce after certain angle or variable in distance, the infra-red intensity that the power valve that infrared tube receiving tube receives sends changes, and output end voltage also changes simultaneously.Through AD conversion, also via detecting mcu judgement, exceed and can be judged to shell after nominal voltage value and be opened, by detecting mcu, preserve and open record.When electronic scale opens and uses, the information that detection mcu opened electronic scale automatically sends to main mcu, and electronic scale prompting user shell was opened.
The utility model can be stopped, by opening electronic scale, to install the phenomenon of electronic remote controller additional.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, describe the utility model in detail;
Fig. 1 is structural representation of the present utility model.
Embodiment
For making the technical problems to be solved in the utility model, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The utility model provides a kind of electronic scale anti-open device based on reflective infrared tube for existing deficiency, comprise fore shell 1, back cover 2, reflecting plate 3, circuit 4 and baffle plate 5, in fore shell 1, be provided with reflecting plate 3, in back cover 2, be provided with circuit 4, between circuit 4, be provided with baffle plate 5.
It should be noted that, described circuit 4 comprises the first resistance R 1, the second resistance R 2, the 3rd resistance R 3, triode Q1, infrared tube power valve D1, infrared tube receiving tube D2 and A-D converter ADC, voltage input end Vin is connected with first resistance R 1 one end, first resistance R 1 other end is connected with the base stage of triode Q1, the collector of triode Q1 is connected with second resistance R 2 one end, second resistance R 2 other ends are connected with power supply VCC end, the emitter of triode Q1 is connected with infrared tube power valve D1 anode, infrared tube power valve D1 plus earth; Infrared tube power valve D1 mono-side is provided with baffle plate 5, baffle plate 5 one sides are provided with infrared tube receiving tube D2, infrared tube receiving tube D2 plus earth, infrared tube receiving tube D2 anode is connected with A-D converter ADC, the 3rd resistance R 3 one end respectively, and the 3rd resistance R 3 other ends are connected with power supply VCC end.
This embodiment but circuit theory be: by detecting the IO mouth of mcu, by resistance R 1, be connected on the triode Q1 as electronic switch.When triode Q1 base stage is high level, during the conducting of collector-emitter, infrared tube power valve D1 work.When otherwise triode Q1 base stage is low, infrared tube power valve D1 does not work.By the second resistance R 2, limited the maximum operating currenbt of infrared tube power valve D1.Infrared tube receiving tube D2 by draw the 3rd resistance R 3 to access in power supply, infrared tube receiving tube D2 anode voltage signal is input on the A-D converter ADC mouth of ADC or the detection mcu with ADC function.Between power valve and receiving tube, with baffle plate, separate, make receiving tube can only receive the infrared ray that power valve returns via reflecting plate.The power supply of use reserve battery, also can detect when electronic scale is not worked.
In order to reduce current drain, adopt mcu timer (as 1s) the triggering work that detects.When timing arrives, detect the IO mouth output high level of mcu, triode Q1 conducting, infrared tube power valve D1 work.Infrared tube receiving tube D2 receives the infrared ray that infrared tube power valve D1 returns via reflecting plate, and intensity is outputed to A-D converter ADC with voltage form, by A-D converter ADC, by after analog quantity digitizing, by detecting mcu, is judged.Before electronic scale comes into operation, to A-D converter, ADC demarcates: by parallel with back cover fore shell separation one segment distance (as 1cm), as shell, open the threshold value of judgement, by detecting mcu record, store the magnitude of voltage that A-D converter ADC collects, as reference voltage.After electronic scale comes into operation, when shell is during in open mode not, the magnitude of voltage that A-D converter ADC collects is less than reference voltage; When shell is in open mode, distance, angle between reflecting plate and infrared tube change, the magnitude of voltage that A-D converter ADC collects will be greater than reference voltage, now detect mcu and judge that shell is opened, detect mcu and automatically record the information being opened that stores, when electronic scale is worked, notify main mcu, take the measures such as prompting or warning.After the one-time detection cycle, detect the IO mouth output low level of mcu, triode Q1 disconnects, and infrared tube power valve D1 does not work, and waits for that next timer triggers.
This embodiment adds electronic lead sealing on the basis of mechanical lead sealing, guarantees that electronic scale is opened, and the situation that installs the equipment such as electronic romote-controller in inside additional can be found in time; Use back-up source to power, guarantee that electronic scale also can detect open state under off working state; Use timer to trigger mode of operation, reduce current drain, guarantee back-up source service time.
The above is preferred implementation of the present utility model; should be understood that; for those skilled in the art; do not departing under the prerequisite of principle described in the utility model; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.
Claims (1)
1. the electronic scale anti-open device based on reflective infrared tube, comprise fore shell (1), back cover (2), reflecting plate (3), circuit (4) and baffle plate (5), in fore shell (1), be provided with reflecting plate (3), in back cover (2), be provided with circuit (4), between circuit (4), be provided with baffle plate (5), it is characterized in that, described circuit (4) comprises the first resistance (R1), the second resistance (R2), the 3rd resistance (R3), triode (Q1), infrared tube power valve (D1), infrared tube receiving tube (D2) and A-D converter (ADC), voltage input end Vin is connected with the first resistance (R1) one end, the first resistance (R1) other end is connected with the base stage of triode (Q1), the collector of triode (Q1) is connected with the second resistance (R2) one end, the second resistance (R2) other end is connected with power supply VCC end, the emitter of triode (Q1) is connected with infrared tube power valve (D1) anode, infrared tube power valve (D1) plus earth, infrared tube power valve (D1) side is provided with baffle plate (5), baffle plate (5) one sides are provided with infrared tube receiving tube (D2), infrared tube receiving tube (D2) plus earth, infrared tube receiving tube (D2) anode is connected with A-D converter (ADC), the 3rd resistance (R3) one end respectively, and the 3rd resistance (R3) other end is connected with power supply VCC end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320497311.4U CN203572569U (en) | 2013-08-14 | 2013-08-14 | Anti-opening device for electronic weighing instrument based on reflection-type infrared tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320497311.4U CN203572569U (en) | 2013-08-14 | 2013-08-14 | Anti-opening device for electronic weighing instrument based on reflection-type infrared tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203572569U true CN203572569U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320497311.4U Expired - Lifetime CN203572569U (en) | 2013-08-14 | 2013-08-14 | Anti-opening device for electronic weighing instrument based on reflection-type infrared tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203572569U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121978A (en) * | 2014-07-25 | 2014-10-29 | 中山佳维电子有限公司 | Tamper-resistant electronic price scale |
| CN109489777A (en) * | 2018-11-21 | 2019-03-19 | 北京市燃气集团有限责任公司 | A kind of volume correction instrument is uncapped detection circuit and the abnormal processing method of metering |
-
2013
- 2013-08-14 CN CN201320497311.4U patent/CN203572569U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104121978A (en) * | 2014-07-25 | 2014-10-29 | 中山佳维电子有限公司 | Tamper-resistant electronic price scale |
| CN109489777A (en) * | 2018-11-21 | 2019-03-19 | 北京市燃气集团有限责任公司 | A kind of volume correction instrument is uncapped detection circuit and the abnormal processing method of metering |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |