CN202147424U - Energy-saving control system for hydraulic motor of press machine - Google Patents
Energy-saving control system for hydraulic motor of press machine Download PDFInfo
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- CN202147424U CN202147424U CN201120079365U CN201120079365U CN202147424U CN 202147424 U CN202147424 U CN 202147424U CN 201120079365 U CN201120079365 U CN 201120079365U CN 201120079365 U CN201120079365 U CN 201120079365U CN 202147424 U CN202147424 U CN 202147424U
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- forcing press
- press machine
- frequency converter
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Abstract
The utility model relates to an energy-saving control system for a hydraulic motor of a press machine, and provides an energy-saving control method for the hydraulic motor of the press machine. A PLC (programmable logic controller) of a processing on and off signal acquiring part is used for controlling a frequency converter in real time. The frequency converter is controlled to reduce power frequency of the hydraulic motor while technical requirements are met in a technical process of press machine forming, so that rotation speed of the motor of the press machine can be reduced to a proper frequency during light loading, idle loading and feed delaying, and energy conservation is achieved. Furthermore, production yield and quality of the press machine are stable, and electricity saving rate is up to 30%-60%.
Description
Technical applications
The present invention relates to a kind of forcing press hydraulic electric motor energy-saving control system that is used for.Forcing press is widely used in five metals, the automobile industry production (comprising four-column hydraulic press, hydraulic press); Modern forcing press is generally by Driven by Hydraulic Cylinder; Hydraulic cylinder power derives from hydraulic pump; The forcing press energy consumption is very most of from hydraulic pump motor, and the energy consumption that reduces hydraulic pump motor can reduce the energy consumption of forcing press significantly.
Background technology
1, forcing press (hydraulic press) is the key equipment of metallic article moulding and forging and pressing, and its operating characteristic is: reach the maximum of power in the time in each product processes cycle 20%, all the other times all are in underloading, zero load, treat the material operation.And its main power consumption is the motor that drags hydraulic oil pump, and drags the big power consumption height of hydraulic oil pump motor power (output), accounts for complete machine load 95% load power.Five metals manufacturing, metal stretching, sheet metal shaping work character are " cycles, circulate, be interrupted production ".In the past, after motor starts, be exactly at full speed, full voltage (380V), frequency 50Hz running, power is in maximum rating always.But press manufacturing technique requirent; Forcing press changes the demand of hydraulic pump flow and pressure; Its flow and pressure confirm that according to technology and parameter size the forcing press load load time is very short, and excess energy is put back to fuel tank through flow proportion valve and pressure proportioning valve control through overflow valve; The low load with strong power ubiquity especially changes workpiece time 80% waste of energy.Motor is not to be in the full speed running state all the time, on average has only 60% load factor.About 40% (or more) waste of energy are arranged in technology zero load and underloading time; Energy is put back to fuel tank through flow proportion valve and pressure proportioning valve control through overflow valve; And hydraulic test is large capacity motor, and the most consumer of inductive load power factor (PF) can not get capacitance compensation.Waste of energy is very serious.
2, there is the forcing press energy-conserving product of Application of Frequency Converter in present market, through providing different supply frequencies to reduce power consumption in the different process stage.But forcing press and forging equipment are seen at present ripe FREQUENCY CONTROL technology is not arranged.The control mode of these forcing press energy-conserving products adopts analog signal (PID) controlled frequency, (PID) linear circuit, characteristic characteristic limitations hydraulic power explosive force at present.Under the condition of production scene, the linear speed-raising of existence is slow, speed is unable to catch up with production technology speed influences yield efficiency, and unfavorable factors such as mains fluctuations, electromagnetic interference, mechanical oscillation are interfered easily, is difficult to realize the stable of forcing press technology.These forcing press energy-conserving product results of use can not be satisfactory in the market.
The problem that content of the present invention solves
Technical problem to be solved by this invention provides a kind of forcing press power-saving control method; In the forcing press technical process, satisfying under the prerequisite of arts demand the supply frequency and the electric current that reduce hydraulic pump with frequency converter; Reach purpose of energy saving; And make forcing press production output and steady quality (not influencing original production efficiency and product quality), the former machine pressure of the equipment that do not influence, flow proportion valve ↓ ↑ adjustability, the constant employing current torque of frequency back tracking method.
The key method of dealing with problems is extraction process reversal valve open and close signals, and PLC is by the frequency of logic control frequency converter.The source of control signal, by forcing press process sensor, open and close signal, the corresponding frequency converter frequency address parameter operation of Programmable Logic Controller (PLC) program.
PLC collection technology sensor, magnetic valve switching signal are through the corresponding 0HZ-50HZ sequencing in PLC programming address identification control, for example: like briquetting pressure 50%, flow 20%; 25 seconds production cycles; Frequency 35HZ, argument address H1010 realizes high stability FREQUENCY CONTROL.Its inside of PLC has outage to keep and telegram in reply memory function, control flexibly, to isolate antijamming capability strong, when instantaneous lightning fluctuation of line voltage in the factory or instant cut-off PLC output constant, PLC output is the Digital Signals frequency converter; It is corresponding with frequency converter frequency address speed parameter that different processes is write the different digital signal; Be not easy to be disturbed, so the frequency converter output frequency is stable, it is stable that motor speed keeps; Critical repeatability is arranged, make forcing press output, constant product quality.Frequency conversion power saving efficient is high.
The technical problem that the present invention further will solve provides a kind of control device of forcing press, to the coaxial heavy wool pump of large pressing machine (four-column hydraulic press), many motors more than 800 tons, and old-fashioned oil system valve type forcing press, realization segmentation Digital Control.Each electric machine speed regulation operation is controlled in the output of PLC multichannel respectively, production technology is more stable, and mechanical property is better, realizes frequency converter and technology synchronous variable-speed, reaches the energy-conservation purpose that reduces cost.Frequency conversion is transformed back hydraulic working oil temperature and is reduced, and prolongs the hydraulic oil life cycle, has saved the cost of hydraulic oil.Realize that the hydraulic transmission equipment consumable accessory prolongs service life, low maintenance cost.
In order to solve the problems of the technologies described above, technical scheme of the present invention is:
A kind of forcing press hydraulic electric motor electricity-saving control system method; Data acquisition processing device is connected with Programmable Logic Controller (PLC) input; The technology input signal is judged, selects, calculates underloading, zero load, is treated that material is data signal output through PLC software program logic; The digital control end of this output end signal and frequency converter is compatible, and frequency converter receives above-mentioned different data signals output correspondent frequency, realizes the open loop digital speed-control.
By gathering forcing press five metals moulding process; Technological process, technological parameter and process conditions require to carry out the software programming program; The pattern fill order that realizes software manager by technological requirement is digital output end and mouthful compatible control of frequency converter numeral with the signal operation of importing; The technology signalizing activity reaches the purpose that does not influence production efficiency and product quality to frequency converter output 0.2 second raise speed certain process frequency and technology synchronization action.
Its internal relay of PLC has outage to keep and the telegram in reply memory function; PLC output inhibit signal is continuous when instantaneous lightning fluctuation of line voltage in the factory or outage; To be used to receive the control signal that said control module transmits continuous for frequency converter when ash is supplied power again, frequency converter output frequency and motor speed maintenance constant speed.
Said data acquisition processing device links to each other with the input able to programme or the pulse input end of said frequency converter.Said real-time monitoring step comprises the steps:
1) signals collecting is used for the working state signal of collection technology;
2) signal is handled, and is used for working state signal is connected with the PLC input, works out to be data signal;
3) judgement of PLC programmed logic, comparison, computing, transmission are used for the parameter preset that establishment data signal and the frequency converter of input signal after through program circuit (ladder diagram) is stored in the control module is compared;
4) PLC sends corresponding control signal change frequency converter frequency and realizes that the technology of controlled pressure machine is synchronous.
Description of drawings
Fig. 1 is the schematic diagram of forcing press energy saver.
The specific embodiment
A kind of forcing press hydraulic electric motor energy-saving control method comprises data acquisition processing device (0), and the technological action signal is selected; Device (1) on " manually " hydraulic cylinder drift; Operation pressure 60% ↓ ↑, flow (speed) 50% ↓ ↑ frequency 30HZ corresponding address H1000, device (2) on " automatically " hydraulic cylinder drift; Operation pressure 60% ↓ ↑, flow (speed) 50% ↓ ↑ frequency 30HZ accordingly 1000; " manually " hydraulic cylinder drift lower device (3); Operation pressure 80% ↓ ↑, flow (speed) 70% ↓ ↑ frequency 40HZ corresponding address H1010, " automatically " hydraulic cylinder drift lower device (4); Operation pressure 80% ↓ ↑, flow (speed) 70% ↓ ↑ frequency 40HZ corresponding address H1010; " automatically " hydraulic cylinder drift liftout attachment; (5) operation pressure 20% ↓ ↑, flow (speed) 60% ↓ ↑ frequency 30HZ corresponding address H0010, " hand " hydrodynamic cylinder pressure drift top unloading device; (6) " operation pressure 20% ↓ ↑, flow (speed) 60% ↓ ↑ frequency 30HZ corresponding address H0010; " automatically " hydraulic cylinder drift lower device (4), operation pressure 80% ↓ ↑, flow (speed) 70% ↓ ↑ frequency 40HZ corresponding address H0100; Manually " device (7) is gone up on hydraulic cylinder drift top, operation pressure 80% ↓ ↑, flow (speed) 70% ↓ ↑ frequency 40HZ corresponding address H0100; Control module (8), frequency converter (1-6 platform) (9); " automatically " hydraulic cylinder drift top unloading device (10); Operation pressure 20% ↓ ↑, flow (speed) 60% ↓ ↑ frequency 30HZ corresponding address H0010, " manually " hydraulic cylinder drift top unloading device; (6) operation pressure 20% ↓ ↑, flow (speed) 60% ↓ ↑ frequency 30HZ corresponding address H0010; Working state signal and be data signal with this working state signal computing;
Said control module 8 is programmable logic controller PLC; Carry out the production technology program command; Drive variable frequency device 9-1 to 9-6 (the tables of equipment motor only drives 9-1); This frequency converter 9 is used to receive the various digital controlled signals that said control module 8 transmits, and selects load factor control rotating speed of motor according to this control signal, realization equipment in underloading, zero load, wait to expect in joint realize the purpose of electricity.
Control device of the present invention detects power saving rate at production equipment.
Claims (2)
1. forcing press hydraulic electric motor energy-saving and frequency-variable system; It is characterized in that: have forcing press hydraulic power source motor frequency conversion energy-saving control system; Comprise and gather forcing press production technology magnetic valve recoil simulator; With programmable logic controller (PLC) control frequency converter, control the frequency adaptation process requirements that makes frequency converter through program software, realize the control system of economize on electricity.
2. forcing press hydraulic electric motor variable speed energy conservation according to claim 1 system, its architectural feature: comprise the control device that electronic box shell, frequency converter, PLC logic controller, relay, sensor, power frequency and frequency conversion bypass are formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120079365U CN202147424U (en) | 2011-03-23 | 2011-03-23 | Energy-saving control system for hydraulic motor of press machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120079365U CN202147424U (en) | 2011-03-23 | 2011-03-23 | Energy-saving control system for hydraulic motor of press machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202147424U true CN202147424U (en) | 2012-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120079365U Expired - Fee Related CN202147424U (en) | 2011-03-23 | 2011-03-23 | Energy-saving control system for hydraulic motor of press machine |
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| Country | Link |
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| CN (1) | CN202147424U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104175597A (en) * | 2014-07-18 | 2014-12-03 | 合肥工业大学 | Energy-saving control method for hydraulic unit driving system |
-
2011
- 2011-03-23 CN CN201120079365U patent/CN202147424U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104175597A (en) * | 2014-07-18 | 2014-12-03 | 合肥工业大学 | Energy-saving control method for hydraulic unit driving system |
| CN104175597B (en) * | 2014-07-18 | 2016-01-20 | 合肥工业大学 | Hydraulic pressure unit drive system energy-saving control method |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Hou Jinlai Document name: Notification to Pay the Fees |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120222 Termination date: 20160323 |
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| CF01 | Termination of patent right due to non-payment of annual fee |