CN201546941U - Small flow weak signal test device - Google Patents
Small flow weak signal test device Download PDFInfo
- Publication number
- CN201546941U CN201546941U CN2009201258208U CN200920125820U CN201546941U CN 201546941 U CN201546941 U CN 201546941U CN 2009201258208 U CN2009201258208 U CN 2009201258208U CN 200920125820 U CN200920125820 U CN 200920125820U CN 201546941 U CN201546941 U CN 201546941U
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- frequency amplifier
- high speed
- flow
- counting module
- speed counting
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Abstract
The utility model discloses a small flow weak signal test device, which belongs to a flow test device and has advantages of simple structure, convenient operation, real and accurate data collection. The device comprises a flow sensor, a PLC high speed counting module and a host microcomputer; the flow sensor (1) is connected with an input end of an F/F frequency amplifier (3) through a communication cable (2); the output end of the F/F frequency amplifier is connected with a PLC high speed counting module (4) through another communication cable (2); and the RS232 communication interface of the PLC high speed counting module is connected with the host microcomputer (5). The utility model not only really reflects the flow of the pump to be tested, but also removes various electromagnetic and noise interferences, has advantages of high testing precision, strong anti-interference capability, fast response, easy maintenance and visual display and is an ideal device for testing the small flow weak signal of the hydraulic pump in combination with the computer.
Description
Technical field: the utility model relates to a kind of weak signal testing apparatus, relates in particular to a kind of device that utilizes hydraulic test bed products such as oil hydraulic pump and hydrovalve to be carried out flux test.
Background technique:, need under the simulated flight situation, examine usually to oil hydraulic pump for detecting aviation hydraulic pressure pump performance better; Particularly under certain loading condition, need carry out performance tests such as high pressure low discharge and off-load small flow to product by test bench, make by pump testing and carry out off-load under high rotating speed, flow sports small flow by big flow.At present, adopt secondary meter or tower flowmeter to measure usually, because secondary meter is disturbed when gathering small flow easily, the fluctuation of collection value is very big, therefore can not truly reflect by the flow value of pump testing; And there is the system pipeline complexity in tower flowmeter, safeguards relatively difficulty, is easy to generate defective such as artificial deviation, and flow switches the danger that has also increased the operator, is difficult to satisfy the test requirements document of product performance.
Summary of the invention: at the above-mentioned defective that exists in the prior art, the utility model aims to provide a kind of simple in structure, easy to operate, data capture small flow weak signal testing apparatus really and accurately.
To achieve these goals, the utility model by the following technical solutions: it comprises flow transducer, PLC high speed counting module and up-computer; Flow transducer is connected by the input end of communication cable with the F/F frequency amplifier, the output terminal of this F/F frequency amplifier is connected with the PLC high speed counting module by another root communication cable, and the RS232 communication interface of this PLC high speed counting module is connected with up-computer.
Communication cable is the twin-core shielding wire, the power cathode of the negative pole of F/F frequency amplifier input end and the screen layer short circuit of this twin-core shielding wire, F/F frequency amplifier and the negative pole short circuit of this F/F frequency amplifier output terminal.
In technique scheme, up-computer is mainly used in real-time preservation test data, and utilize configuration software to draw pressure-flow curve (P-Q curve), thereby can reflect intuitively by the relation of pump testing, therefore can find out very easily by the fault of pump testing or defective at various state downforce-flows.
The effect of F/F frequency amplifier is that the small-signal same frequency with 20～80mV of flow transducer output is enlarged into the strong signal more than the 3V, and sends the PLC high speed counting module to.
The PLC high speed counting module is mainly used to signal, the storage data that real-time acquisition stream quantity sensor transmits, and sends the value of register to up-computer by the RS232 communication interface then, and draw continuous flow value on up-computer.
Adopt the twin-core shielding wire can eliminate various electromagnetism or noise jamming signal effectively.
Compared with the prior art, the utility model is owing to adopted technique scheme, therefore not only can truly reflect by the flow of pump testing, but also can eliminate the electromagnetic interference that elements such as various solenoid valves, switch power produce, also can eliminate white Gaussian noise and Poisson noise simultaneously.The utlity model has that measuring accuracy height, antijamming capability are strong, response is fast, simple in structure, easy to operate, safeguard easily, plurality of advantages such as direct display.
Description of drawings:
Fig. 1 is a structural representation of the present utility model.
Among the figure: flow transducer 1 communication cable 2 F/F frequency amplifiers 3 PLC high speed counting modules 4 up-computers 5
Embodiment: the utility model is described in further detail with specific embodiment below in conjunction with accompanying drawing: flow transducer 1 is connected by the input end of communication cable 2 with F/F frequency amplifier 3, the output terminal of this F/F frequency amplifier is connected with PLC high speed counting module 4 by another root communication cable 2, and the RS232 communication interface of this PLC high speed counting module is connected with up-computer 5.For fear of being subjected to on-the-spot electromagnetism or noise jamming, reduce the distortion level of data capture, communication cable 2 adopts the twin-core shielding wire; The power cathode of the negative pole of F/F frequency amplifier 3 input ends and the screen layer short circuit of this twin-core shielding wire, F/F frequency amplifier 3 and the negative pole short circuit of this F/F frequency amplifier output terminal.
Claims (2)
1. a small flow weak signal testing apparatus comprises flow transducer, PLC high speed counting module and up-computer; It is characterized in that: flow transducer (1) is connected with the input end of F/F frequency amplifier (3) by communication cable (2), the output terminal of this F/F frequency amplifier is connected with PLC high speed counting module (4) by another root communication cable (2), and the RS232 communication interface of this PLC high speed counting module is connected with up-computer (5).
2. small flow weak signal testing apparatus according to claim 1, it is characterized in that: communication cable (2) is the twin-core shielding wire, the power cathode of the negative pole of F/F frequency amplifier (3) input end and the screen layer short circuit of this twin-core shielding wire, F/F frequency amplifier (3) and the negative pole short circuit of this F/F frequency amplifier output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201258208U CN201546941U (en) | 2009-11-17 | 2009-11-17 | Small flow weak signal test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201258208U CN201546941U (en) | 2009-11-17 | 2009-11-17 | Small flow weak signal test device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201546941U true CN201546941U (en) | 2010-08-11 |
Family
ID=42602112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201258208U Expired - Lifetime CN201546941U (en) | 2009-11-17 | 2009-11-17 | Small flow weak signal test device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201546941U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678532A (en) * | 2011-03-09 | 2012-09-19 | 上海衡仪器厂有限公司 | Infusion pump flow parameter gauge |
| CN107478322A (en) * | 2017-07-12 | 2017-12-15 | 浙江亚太机电股份有限公司 | A kind of hydraulic control unit Noise Testing |
-
2009
- 2009-11-17 CN CN2009201258208U patent/CN201546941U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102678532A (en) * | 2011-03-09 | 2012-09-19 | 上海衡仪器厂有限公司 | Infusion pump flow parameter gauge |
| CN107478322A (en) * | 2017-07-12 | 2017-12-15 | 浙江亚太机电股份有限公司 | A kind of hydraulic control unit Noise Testing |
| CN107478322B (en) * | 2017-07-12 | 2019-07-16 | 浙江亚太机电股份有限公司 | A kind of hydraulic control unit Noise Testing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20151015 Address after: Wudang District new village of Beiya village 550018 Guizhou province Guiyang City 102 Building 1 layer, 2 layer 113 Building No. 1 Patentee after: Liyuan Hydraulic System (Guiyang) Co., Ltd. Address before: 550018 Guizhou Province, Guiyang city Wudang District Beiya New Village Road No. 501 Patentee before: Liyuan Hydraulic Co., Ltd. of Aviation Industry Corporation of China |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100811 |
|
| CX01 | Expiry of patent term |