CN204988452U - A high accuracy weighing device for metal material fatigue damage - Google Patents
A high accuracy weighing device for metal material fatigue damage Download PDFInfo
- Publication number
- CN204988452U CN204988452U CN201520803168.6U CN201520803168U CN204988452U CN 204988452 U CN204988452 U CN 204988452U CN 201520803168 U CN201520803168 U CN 201520803168U CN 204988452 U CN204988452 U CN 204988452U
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- amplifier
- operational amplifier
- digital processing
- processing circuit
- button
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Abstract
The utility model discloses a high accuracy weighing device for metal material fatigue damage, including weighing sensor, enlarged module, AD converter, digital processing circuit, memory, display and a plurality of button K, weighing sensor, enlarged module, AD converter, digital processing circuit and display are consecutive, button and memory all link to each other with digital processing circuit, enlarged module cascade by 2 inverting amplifier and form, inverting amplifier adopts operational amplifier, wherein 2 inverting amplifier are pre -amplifier and main air port amplifier, the pre -amplifier is the magnification adjustable amplifier circuit, the magnification adjustable amplifier circuit include operational amplifier A1 and four select an analog switch. This a high accuracy weighing device for metal material fatigue damage easy to carry out, the range is adjustable, and measurement accuracy is high.
Description
Technical field
The utility model relates to a kind of high-precision weighing device for Fatigue Damage of Metal.
Background technology
Hydrometer method is adopted to come in the process of measuring metallic materials fatigue damage, need the quality of measuring metallic materials sample, existing weighting device structure is complicated, cost is high, and measuring accuracy does not reach the requirement of experiment, moreover, its range cannot regulate, dirigibility is poor, therefore, is necessary to design a kind of novel weighing device.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of high-precision weighing device for Fatigue Damage of Metal, and this high-precision weighing device being used for Fatigue Damage of Metal is easy to implement, and range is adjustable, and measuring accuracy is high.
The technical solution of utility model is as follows:
For a high-precision weighing device for Fatigue Damage of Metal, comprise LOAD CELLS, amplification module, A/D converter, digital processing circuit, storer, display and multiple button K;
LOAD CELLS, amplification module, A/D converter, digital processing circuit are connected successively with display; Button is all connected with digital processing circuit with storer;
Described amplification module is formed by 2 sign-changing amplifier cascades; Sign-changing amplifier adopts operational amplifier; Wherein 2 sign-changing amplifiers are pre-amplifier and post-amplifier;
Pre-amplifier is the adjustable amplifying circuit of enlargement factor;
The amplifying circuit that described enlargement factor is adjustable comprises operational amplifier A 1 and four and selects an analog switch;
The reverse input end of operational amplifier A 1 meets the output terminal Ui of LOAD CELLS through resistance R11;
The reverse input end of operational amplifier A 1 also connects through resistance R1, R2, R3 and R4 correspondence 4 signal input parts that four select an analog switch respectively; And resistance R1, R2, R3 are different with the resistance value of R4;
The input end in the same way of operational amplifier A 1 is through resistance R12 ground connection;
The input end of the output termination post-amplifier of operational amplifier A 1;
The output terminal of operational amplifier A 1 also connects the output terminal that four select an analog switch;
Four select 2 of an analog switch channel selecting ends to connect 2 output ports of digital processing circuit respectively;
The first end of described button K meets DC power anode Vcc by pull-up resistor R0, the second end ground connection of button K; The signal input part of the first termination digital processing circuit of button K.
Described A/D converter adopts 16 bit A/D converter chip AD976A.
Described display is LCDs.
Digital processing circuit is existing proven technique, digital device can be adopted to build, also can adopt integrated process chip, as single-chip microcomputer and DSP etc., when adopting the integrated device such as single-chip microcomputer or DSP, does not relate to progresses and methods.
Beneficial effect:
High-precision weighing device for Fatigue Damage of Metal of the present utility model adopts 2 operational amplifier cascades as amplification module, faint signal is amplified, and adopt the A/D converter of 16 to carry out analog-digital conversion, thus measuring accuracy is high, in addition, the parts adopted are the parts of conventional maturation, and easy to implement, cost is low.Another large feature of the present utility model is that enlargement factor is adjustable, namely by 4 different resistance, one four select the cooperation of an analog switch and digital processing circuit to achieve the adjustable of range, therefore, this weighing device dirigibility is good.
Accompanying drawing explanation
Fig. 1 is the overall circuit block diagram of the high-precision weighing device for Fatigue Damage of Metal;
Fig. 2 is key circuit schematic diagram;
Fig. 3 is the circuit theory diagrams of amplification module.
Embodiment
Below with reference to the drawings and specific embodiments, the utility model is described in further details:
As Figure 1-3, a kind of high-precision weighing device for Fatigue Damage of Metal, comprises LOAD CELLS, amplification module, A/D converter, digital processing circuit, storer, display and multiple button K;
LOAD CELLS, amplification module, A/D converter, digital processing circuit are connected successively with display; Button is all connected with digital processing circuit with storer;
Described amplification module is formed by 2 sign-changing amplifier cascades; Sign-changing amplifier adopts operational amplifier; Wherein 2 sign-changing amplifiers are pre-amplifier and post-amplifier;
Pre-amplifier is the adjustable amplifying circuit of enlargement factor;
The amplifying circuit that described enlargement factor is adjustable comprises operational amplifier A 1 and four and selects an analog switch;
The reverse input end of operational amplifier A 1 meets the output terminal Ui of LOAD CELLS through resistance R11;
The reverse input end of operational amplifier A 1 also connects through resistance R1, R2, R3 and R4 correspondence 4 signal input parts that four select an analog switch respectively; And resistance R1, R2, R3 are different with the resistance value of R4;
The input end in the same way of operational amplifier A 1 is through resistance R12 ground connection;
The input end of the output termination post-amplifier of operational amplifier A 1;
The output terminal of operational amplifier A 1 also connects the output terminal that four select an analog switch;
Four select 2 of an analog switch channel selecting ends to connect 2 output ports of digital processing circuit respectively;
The first end of described button K meets DC power anode Vcc by pull-up resistor R0, the second end ground connection of button K; The signal input part of the first termination digital processing circuit of button K.
Described A/D converter adopts 16 bit A/D converter chip AD976A.
Described display is LCDs.
In Fig. 2, when button K does not press, P30 place is high level (Vcc), and when button K presses, P30 place ground connection is low level, and whether this circuit can detect button K and press thus.
This key circuit is multiple, and at least one measures button and a heavy button of unhairing.
In Fig. 3,2 operational amplifier A 1 and A2, all as sign-changing amplifier, adopt different resistance configuration, can obtain different enlargement factors, and after cascade, this amplifier is still forward amplifying circuit.Ui is the signal that sensor exports, and Uo is the output signal of amplification module, is connected with A/D converter.
Four select the principle of work of an analog switch part to illustrate: four select an analog switch can only select connection one road signal at every turn, because R1-R4 resistance is different, therefore, same road signal is by different resistance, its enlargement factor is different, correspond to and measures range difference, and channel selecting end B1 with B0 is used for the different passage of gating, as B1B0 be 00 time, gating first passage, the corresponding gating 2 of 01,10 and 11 difference, 3,4 passages.The numerical value of B1 and B0 is controlled by digital processing circuit.
The measuring process of this weighing device is used to be: first to claim gross weight, then unhairing key is pressed, weight to be measured is put in display screen prompting, after weight is put into, press measurement key again, then the weight now recorded deducts the weight (concrete subtraction is performed by the subtracter in digital processing circuit) that gross weight is weight, and the weight of weight shows in the display, for reading, namely complete one-shot measurement.
Claims (3)
1. for a high-precision weighing device for Fatigue Damage of Metal, it is characterized in that, comprise LOAD CELLS, amplification module, A/D converter, digital processing circuit, storer, display and multiple button K;
LOAD CELLS, amplification module, A/D converter, digital processing circuit are connected successively with display; Button is all connected with digital processing circuit with storer;
Described amplification module is formed by 2 sign-changing amplifier cascades; Sign-changing amplifier adopts operational amplifier; Wherein 2 sign-changing amplifiers are pre-amplifier and post-amplifier;
Pre-amplifier is the adjustable amplifying circuit of enlargement factor;
The amplifying circuit that described enlargement factor is adjustable comprises operational amplifier A 1 and four and selects an analog switch;
The reverse input end of operational amplifier A 1 meets the output terminal Ui of LOAD CELLS through resistance R11;
The reverse input end of operational amplifier A 1 also connects through resistance R1, R2, R3 and R4 correspondence 4 signal input parts that four select an analog switch respectively; And resistance R1, R2, R3 are different with the resistance value of R4;
The input end in the same way of operational amplifier A 1 is through resistance R12 ground connection;
The input end of the output termination post-amplifier of operational amplifier A 1;
The output terminal of operational amplifier A 1 also connects the output terminal that four select an analog switch;
Four select 2 of an analog switch channel selecting ends to connect 2 output ports of digital processing circuit respectively;
The first end of described button K meets DC power anode Vcc by pull-up resistor R0, the second end ground connection of button K; The signal input part of the first termination digital processing circuit of button K.
2. the high-precision weighing device for Fatigue Damage of Metal according to claim 1, is characterized in that, described A/D converter adopts 16 bit A/D converter chip AD976A.
3. the high-precision weighing device for Fatigue Damage of Metal according to claim 1 and 2, is characterized in that, described display is LCDs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520803168.6U CN204988452U (en) | 2015-10-16 | 2015-10-16 | A high accuracy weighing device for metal material fatigue damage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520803168.6U CN204988452U (en) | 2015-10-16 | 2015-10-16 | A high accuracy weighing device for metal material fatigue damage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204988452U true CN204988452U (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520803168.6U Expired - Fee Related CN204988452U (en) | 2015-10-16 | 2015-10-16 | A high accuracy weighing device for metal material fatigue damage |
Country Status (1)
| Country | Link |
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| CN (1) | CN204988452U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225522A (en) * | 2018-02-07 | 2018-06-29 | 福州大学 | A kind of logistics dynamic weigher and its weighing method |
-
2015
- 2015-10-16 CN CN201520803168.6U patent/CN204988452U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108225522A (en) * | 2018-02-07 | 2018-06-29 | 福州大学 | A kind of logistics dynamic weigher and its weighing method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160120 Termination date: 20161016 |