CN103941630A - Pneumatic measuring instrument control system based on PLC - Google Patents
Pneumatic measuring instrument control system based on PLC Download PDFInfo
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- CN103941630A CN103941630A CN201410142819.1A CN201410142819A CN103941630A CN 103941630 A CN103941630 A CN 103941630A CN 201410142819 A CN201410142819 A CN 201410142819A CN 103941630 A CN103941630 A CN 103941630A
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- China
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- plc
- pneumatic
- pneumatic measuring
- expansion module
- control system
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Abstract
The invention discloses a pneumatic measuring instrument control system based on a PLC. The pneumatic measuring instrument control system comprises the PLC, an extended module, a display, a data sampler and a pneumatic measuring control device. The extended module is connected with the input end of the PLC, and used for storing and extending data. The output end of the pneumatic measuring control device is connected with the input end of the PLC, and the pneumatic measuring control device is used for pneumatic measuring. The output end of a pneumatic measuring and processing system is connected with the input end of the PLC. The data sampler is connected with the PLC, and used for data sampling, analyzing and processing. The display is connected with the PLC through RS232, is in conversation with the PLC as human-machine integrative equipment, and displays and prints the result of pneumatic measuring. The system achieves wide-range online non-contact type dimensional measurement of a small-range sensor, is high in measuring precision, small in error and high in efficiency, and can bring good economic and social benefits.
Description
Technical field
The present invention relates to a kind of workpiece noncontact automatic measurement and control system, in particular, relate to a kind of pneumatic gauging control system based on PLC.
Background technology
Air-gauge is using air as medium, and according to the dynamic and static mechanics physical principle of gas, the one that the physical dimension in measurement range is measured is instrument relatively.In recent years, the control system of air-gauge and air-gauge is greatly improved, but measuring accuracy is lower, scope is less and automatic control level is not high, there are following shortcomings: one, the range of pneumatic measuring instrument is in the past less, if back pressure type is 0.05～0.25mm, can not be used for the occasion that measured size variation range is large; Two, common measurement, owing to being subject to the restriction of activity space and measurement capability, is difficult to realize high precision, high efficiency measurement, as electronics clearance gauge, photoelectric microscope; Three, routine measurement system automation degree is low, cannot tackle in time the various complex situations that occur in pneumatic gauging process, and production cost is high, equipment failure rate is high, and interference from human factor measuring accuracy affects the efficiency of whole pneumatic measuring system.
Summary of the invention
The present invention is in order to overcome above-mentioned deficiency, has provided a kind of pneumatic gauging control system based on PLC.
Technical scheme of the present invention is as follows:
A kind of pneumatic gauging control system based on PLC: comprise PLC controller, expansion module, display, data sampler, pneumatic gauging control device; Described expansion module is connected with PLC controller input end, for storage, the expansion of data; Described pneumatic gauging control device comprises giant, small nozzle, block, air-gauge, and the output terminal of pneumatic gauging control device is connected with the input end of PLC controller, for pneumatic gauging; Described pneumatic gauging disposal system is connected with PLC input end; Described data sampler is connected with PLC controller, for data sampling, analysis and processing; Described display is connected with PLC controller by RS232, as equipment and the dialogue of PLC controller of man-machine integration, shows and print the result of pneumatic gauging.
Described expansion module comprises EM232 expansion module and EM235 expansion module, and EM232 expansion module is connected with sensor, and EM235 expansion module is connected with pressure unit.
Described sensor comprises pressure transducer, pneumatic transmitter.
The present invention compared with prior art, have the following advantages and high-lighting effect: the present invention has changed pneumatic gauging mode in the past PLC control technology is applied in pneumatic gauging control system, start air measuring device and produce gas, gas flow through pneumatic transmitter in PLC controller, the physical size of the automatic measuring workpieces of PLC controller, realizes the on-line measurement of workpiece.
Except above these, the present invention realizes the online contactless dimensional measurement of wide range of small-range sensor, greatly reduces the measuring error that human factor causes, and has reduced production cost, improve precision and production efficiency, can produce good economic benefit and social benefit.
Brief description of the drawings
Fig. 1 is pneumatic gauging control system figure of the present invention;
Fig. 2 is pneumatic gauging process flowchart of the present invention;
Fig. 3 is that pneumatic gauging PLC of the present invention controls lab diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention and embodiment thereof are described in further detail.
As shown in Figure 1, the present invention includes PLC controller, expansion module, display, data sampler, pneumatic gauging control device; Described expansion module is connected with PLC controller input end, for storage, the expansion of data; The output terminal of described pneumatic gauging control device is connected with the input end of PLC controller, for pneumatic gauging; Described pneumatic gauging disposal system is connected with PLC input end; Described data sampler is connected with PLC controller, for data sampling, analysis and processing; Described display is connected with PLC controller by RS232, as equipment and the dialogue of PLC controller of man-machine integration, shows and print the result of pneumatic gauging.
Described pneumatic gauging control device, comprises giant, small nozzle, block, air-gauge; Giant control chamber pressure is P
b, to measure chamber pressure be P to small nozzle
s, block gap is s.Large and small nozzle pneumatic gauging control meets relational expression: f (s)=Δ P=P
b-P
s.
Compressed air source unit in described pneumatic gauging control device produces the gas Δ p reliever of flowing through, and detects control chamber air pressure p at reliever medium-long range switchgear
s, pressure unit detect measure chamber air pressure p
b, in reliever, compare p
b, p
sobtain draught head Δ P=P with the value of Δ P
b-P
s, f (s); Be the controlled parameter of frequency converter as pneumatic parameter, frequency converter starts to start frequency division air pressure signal f (s) and obtains fractional frequency signal f
i(s) (i=2,4,8,16), by fractional frequency signal f
i(s) (i=2,4,8,16) are sent in pressure transducer; Pressure signal is converted to current signal by pressure transducer, and current signal flows in PLC controller through control bus; PLC controller calculates the measurement size of workpiece, and the workpiece calibration size and the standard size that obtain are compared, and in display measurement, display measurement result, as the basic size of workpiece and error, realizes the on-line measurement of workpiece.Described PLC controller adopts Siemens S7-200 series Programmable logic Controller (PLC).
Described pneumatic gauging disposal system is mainly input control chamber pressure P
b, measure chamber pressure P
s, gap s equivalence between nozzle and block, start frequency converter frequency division, pulse encoder counting, in scrambler, write PLC counting procedure, the control chamber pressure of realizing pneumatic gauging with measure chamber pressure comparison, complete pneumatic gauging, process as shown in Figure 2.
Select 10000pa type air measuring device as experimental facilities, giant diameter is 0.3cm, and specified pressure is 1000pa.Make s-f (block gap-draught head) curve map by experimental data, as shown in Figure 3.Obtained experimental data PLC program is transferred in PLC controller through cable, in display, watches shape and the parameter variable quantity of s and f figure, for amendment PLC process of measurement provides reference frame.
In addition to the implementation, the present invention can also have other embodiments.All technical schemes that is equal to replacement or equivalent transformation distortion, all in the claimed scope of the present invention.
Claims (4)
1. the pneumatic measuring instrument control system based on PLC, is characterized in that: comprise PLC controller, expansion module, display, data sampler, pneumatic gauging control device; Described expansion module is connected with PLC controller input end, for storage, the expansion of data; Described pneumatic gauging control device comprises giant, small nozzle, block, air-gauge, and the output terminal of pneumatic gauging control device is connected with the input end of PLC controller, for pneumatic gauging; Described pneumatic gauging disposal system is connected with PLC input end; Described data sampler is connected with PLC controller, for data sampling, analysis and processing; Described display is connected with PLC controller by RS232, as equipment and the dialogue of PLC controller of man-machine integration, shows and print the result of pneumatic gauging.
2. a kind of pneumatic measuring instrument control system based on PLC as claimed in claim 1, is characterized in that: described pneumatic gauging disposal system comprises frequency converter and pulse encoder, and frequency converter is for frequency division, and pulse code is for counting.
3. a kind of pneumatic measuring instrument control system based on PLC as claimed in claim 1, it is characterized in that: described expansion module comprises EM232 expansion module and EM235 expansion module, EM232 expansion module is connected with sensor, and EM235 expansion module is connected with pressure unit.
4. a kind of pneumatic measuring instrument control system based on PLC according to claim 3, is characterized in that: described sensor comprises pressure transducer, pneumatic transmitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410142819.1A CN103941630A (en) | 2014-04-03 | 2014-04-03 | Pneumatic measuring instrument control system based on PLC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410142819.1A CN103941630A (en) | 2014-04-03 | 2014-04-03 | Pneumatic measuring instrument control system based on PLC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103941630A true CN103941630A (en) | 2014-07-23 |
Family
ID=51189349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410142819.1A Pending CN103941630A (en) | 2014-04-03 | 2014-04-03 | Pneumatic measuring instrument control system based on PLC |
Country Status (1)
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| CN (1) | CN103941630A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596452A (en) * | 2014-12-26 | 2015-05-06 | 大连佳林设备制造有限公司 | Electrical control system for measuring projection of engine fuel spray nozzle |
| CN105487474A (en) * | 2015-11-30 | 2016-04-13 | 桂林电子科技大学 | Precise control system based on virtual slice nondestructive measurement device |
-
2014
- 2014-04-03 CN CN201410142819.1A patent/CN103941630A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104596452A (en) * | 2014-12-26 | 2015-05-06 | 大连佳林设备制造有限公司 | Electrical control system for measuring projection of engine fuel spray nozzle |
| CN105487474A (en) * | 2015-11-30 | 2016-04-13 | 桂林电子科技大学 | Precise control system based on virtual slice nondestructive measurement device |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140723 |