CN202826497U - High-precision synchronizing and positioning device for hydraulic machine - Google Patents
High-precision synchronizing and positioning device for hydraulic machine Download PDFInfo
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- CN202826497U CN202826497U CN 201220361797 CN201220361797U CN202826497U CN 202826497 U CN202826497 U CN 202826497U CN 201220361797 CN201220361797 CN 201220361797 CN 201220361797 U CN201220361797 U CN 201220361797U CN 202826497 U CN202826497 U CN 202826497U
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Abstract
The utility model relates to a high-precision synchronizing and positioning device for a hydraulic machine, which comprises a hydraulic system, two or more main hydraulic cylinders and a control system of the hydraulic machine, wherein a PLC (Programmable Logic Controller) and a frequency converter are arranged on the control system; the frequency converter and the PLC are provided with communication interfaces and a plurality of displacement sensors; the displacement sensors are used for detecting and feeding back output locations of piston rods of the main hydraulic cylinders to the control system, so as to operate an output speed to be given in advance of an oil pump motor in the hydraulic system; and the acceleration time and the deceleration time of the frequency converter are set within 0.2s. In synchronizing and positioning control, the acceleration time and the deceleration time of the frequency converter are set within 0.2s, so that the frequency variation of the frequency converter can be adapted better, and the synchronizing action of each controlled hydraulic cylinder is still precise; for the acceleration time and the deceleration time of the oil pump motor in start and stop processes, the required speed, namely the output frequency of the frequency converter, is given in advance through location detection and blurring operation.
Description
Technical field
The utility model relates to a kind of hydraulic press, especially relates to a kind of high-precise synchronization and positioner of hydraulic press.
Background technology
It is the output flow of regulating oil pump by the electric machine frequency that changes driving pump that the hydraulic press frequency conversion is transferred, thus the movement velocity of control operating cylinder.The manufacturer of present most domestic hydraulic press compares backward in technique with the imported hydraulic machine, hydraulic system is simple, low cost of manufacture, and the hydraulic pressure jerk is large, and oil leakage phenomenon is commonplace; So using frequency converter timing to have following problem.
1. the frequent overload-alarm of frequency converter: since design of Hydraulic System with adjust unreasonable; Make oil pump and motor produce the moment overload; When particularly oil pump reaches behind the certain pressure at once off-load; Overload current with the front motor recruitment frequently the time be rated current 7-8 doubly, and the electrothermal relay overcurrent need to be transshipped the regular hour and could be reported to the police; But the overload capacity of frequency converter is general maximum at 200%-250% behind the use frequency converter; And in case exceed maximum current and report to the police at once.Can reduce warning although increase transducer power, can increase cost like this, can not guarantee and normally to move.
2. the too high warning of the DC bus-bar voltage of frequency converter: because most of common hydraulic press is compressing, stretch, stamping-out etc. are multi-functional; When compressing or punching process, need oil pump to reach certain pressure (20-25MPa) and just can finish product; But oil pump loses load with regard at once off-load after arriving setting pressure; At this moment pump speed can exceed the rotating speed of frequency converter output; Make motor become generator and cause dc bus moment of frequency converter to uprise, frequency converter is reported to the police and is shut down.
3. velocity variations low-response: because frequency converter has raising speed and deceleration time; Too slow (generally at 0.5 second about-1.5) that this time can not transfer; So the larger response of rate request variable quantity is slower.
The hydraulic press frequency control has very high velocity control accuracy, the Hydraulic Adjustable Speed of generally acknowledging and the development trend of Synchronization Control, but in practice, can't promote for many years, especially the high-precise synchronization of hydraulic press and aspect, location are used seldom, except the use cost height, mainly be that the problem of above existence can't well solve.
Summary of the invention
The utility model main purpose provides a kind of device that can make each main hydraulic cylinder high-precise synchronization of hydraulic press and location.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of high-precise synchronization of hydraulic press and positioner, comprise the hydraulic system of hydraulic press, two or more main hydraulic cylinder and control systems, PLC controller and frequency converter are set on the control system, and this frequency converter and PLC controller are provided with communication interface; It is characterized in that: comprise that also several detect main hydraulic cylinder piston rod outgoing position and feed back to control system need shift to an earlier date the output speed of the Oil pump electrical machinery in the given hydraulic system with computing displacement transducer; The acceleration time of frequency converter and deceleration time were arranged in 0.2 second.Synchronously and in the positioning control, with frequency converter acceleration time and deceleration time in 0.2 second, can adapt to preferably the variable quantity of the frequency of frequency converter, make the synchronization action of each hydraulic cylinder of control more accurate; As for Oil pump electrical machinery start and stopped process in Acceleration and deceleration time, utilize position probing and fuzzy operation to shift to an earlier date the rotating speed of given needs, the i.e. output frequency of frequency converter.The predetermined output frequency of the computing frequency converter by position probing, control system, and the acceleration time of control frequency converter, can make hydraulic press synchronously and the location more accurate.
As preferably, each magnetic valve in the hydraulic circuit of control main hydraulic cylinder, by PLC control, PLC makes each magnetic valve opening time and slow 0.01 second-0.5 second shut-in time.Make each magnetic valve in the hydraulic system can regulate the slow time of unlatching and close the slow time (generally between 0.01 second-0.5 second, regulating) by PLC control, remedy the different open and close characteristic of each magnetic valve, reduce the impact of hydraulic system, thereby the adjustment hydraulic system reduces the hydraulic system vibrations as far as possible.
Because hydraulic system is the process of dynamic change, pressure jump in actual use is unavoidable, and in order not make frequency converter warning dc bus too high when not increasing cost, as preferably, PLC utilizes communication to read the DC bus-bar voltage of frequency converter; When detecting DC bus-bar voltage and be higher than certain voltage, PLC utilizes communication to increase the given frequency of frequency converter.PLC utilizes communication to read at any time the DC bus-bar voltage of frequency converter, and when detecting DC bus-bar voltage and be higher than certain voltage, the given frequency of utilizing communication to increase frequency converter at once reduces because the busbar voltage that inertia produces is too high.
Therefore, the utility model can make each main hydraulic cylinder high-precise synchronization and location, also can make the hydraulic system vibrations reduce as far as possible, tackle preferably operating hydraulic pressure sudden change.
Description of drawings
Accompanying drawing 1 is a kind of principle schematic of the present utility model.
The specific embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: the high-precise synchronization of a kind of hydraulic press of the utility model and positioner, as shown in Figure 1, it comprises the hydraulic system of hydraulic press, two or more main hydraulic cylinder and control systems, PLC controller and frequency converter are set on the control system, and this frequency converter and PLC controller are provided with communication interface; Also being provided with several detects main hydraulic cylinder piston rod outgoing position and feeds back to control system need shift to an earlier date the output speed of the Oil pump electrical machinery in the given hydraulic system with computing displacement transducer; The acceleration time of frequency converter and deceleration time were arranged in 0.2 second.Be appreciated that for art technology person displacement transducer can be installed in position suitable on the hydraulic press, for example fuselage, piston rod end etc. position.
In Synchronization Control or the higher occasion of rate request, although the variable frequency regulating speed control precision is high, the slow time length of speed responsive (just can make general frequency converter acceleration time and deceleration time the stable operation of Oil pump electrical machinery group more than 0.6 second (deciding according to transducer power); The frequency that changes so 20HZ just needs 0.24 second).But in actual synchronization and positioning control, the variable quantity of frequency is generally all little, so we can will speed up time and deceleration time in 0.2 second, as for the Acceleration and deceleration time of Oil pump electrical machinery in startup and stopped process, we can utilize communication function to carry out slowly lifting speed, the slow time in synchronous and the positioning control can be reduced more than 3 times like this; And this slow time and change procedure we can predict in fact, can solve by software program fully, although different occasion solutions are not quite similar, and generally can utilize position probing and fuzzy operation to shift to an earlier date the speed (being the output frequency of frequency converter) of given needs.
Each magnetic valve in the hydraulic circuit of control main hydraulic cylinder, by PLC control, PLC makes each magnetic valve opening time and slow 0.01 second-0.5 second shut-in time.This mode can be adjusted hydraulic system, and the hydraulic system vibrations are reduced as far as possible, and particularly the damping of Adjustment System valve and spring match optimum state, makes the open and close of system valve stable gently.Make each magnetic valve in the hydraulic system can regulate the slow time of unlatching and close the slow time (generally between 0.01 second-0.5 second) adjusting by PLC control, remedy the different open and close characteristic of each magnetic valve, reduce the impact of hydraulic system.
PLC utilizes communication to read the DC bus-bar voltage of frequency converter; When detecting DC bus-bar voltage and be higher than certain voltage, PLC utilizes communication to increase the given frequency of frequency converter.Because hydraulic system is the process of dynamic change, pressure jump in actual use is unavoidable, in order when not increasing cost, not make frequency converter newspaper dc bus too high, we utilize communication is exactly the DC bus-bar voltage that reads at any time frequency converter, when detecting DC bus-bar voltage and be higher than certain voltage (about 600V), utilize communication to increase that given frequency reduces because the busbar voltage that inertia produces is too high at once.This function also can directly be done into frequency converter control system the inside, like this better effects if.
Utilize said method, we have developed 500 tons of threeway extruders and 600 tons of threeway extruders for certain company, wherein 500 tons of threeway extruders utilize RS485 communication port and program controller on the industrial panel computer to carry out RS485 communication and logical operation processing, recycling program controller and frequency converter carry out the speed of RS485 Communication Control left and right sides cylinder, and adopt resistor type displacement sensor to measure the physical location of left and right sides cylinder (certainty of measurement reach ± 0.01) and carry out synchronous closed-loop control, realize the equidistant synchronous extruding in the left and right sides of the swollen type hydraulic machine of 500 tons of three-dimensionals, about the whole full-automatic process of the technological process such as equidistant synchronous extruding not, the synchronization accuracy of left and right sides cylinder can reach ± 0.1.600 tons of threeway extruders utilize program controller and frequency converter to carry out the speed of RS485 Communication Control left and right sides cylinder, and adopt the physical location (certainty of measurement reach ± 0.001) of pulsed displacement sensor left and right sides cylinder to carry out the quick positioning control of left and right sides cylinder, the positioning accuracy of this hydraulic press under the speed of 20mm/s can reach ± and 0.02, be that positioning accuracy is the highest under the equal work speed of present domestic hydraulic press.
Claims (3)
1. the high-precise synchronization of a hydraulic press and positioner comprise the hydraulic system of hydraulic press, two or more main hydraulic cylinder and control systems, and PLC controller and frequency converter are set on the control system, and this frequency converter and PLC controller are provided with communication interface; It is characterized in that: comprise that also several detect main hydraulic cylinder piston rod outgoing position and feed back to control system need shift to an earlier date the output speed of the Oil pump electrical machinery in the given hydraulic system with computing displacement transducer; The acceleration time of frequency converter and deceleration time were arranged in 0.2 second.
2. the high-precise synchronization of a kind of hydraulic press according to claim 1 and positioner, it is characterized in that: each magnetic valve in the hydraulic circuit of control main hydraulic cylinder, by PLC control, PLC makes each magnetic valve opening time and slow 0.01 second-0.5 second shut-in time.
3. the high-precise synchronization of a kind of hydraulic press according to claim 1 and 2 and positioner, it is characterized in that: PLC utilizes communication to read the DC bus-bar voltage of frequency converter; When detecting DC bus-bar voltage and be higher than certain voltage, PLC utilizes communication to increase the given frequency of frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361797 CN202826497U (en) | 2012-07-25 | 2012-07-25 | High-precision synchronizing and positioning device for hydraulic machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220361797 CN202826497U (en) | 2012-07-25 | 2012-07-25 | High-precision synchronizing and positioning device for hydraulic machine |
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| CN202826497U true CN202826497U (en) | 2013-03-27 |
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| CN 201220361797 Expired - Fee Related CN202826497U (en) | 2012-07-25 | 2012-07-25 | High-precision synchronizing and positioning device for hydraulic machine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671305A (en) * | 2013-12-18 | 2014-03-26 | 中国原子能科学研究院 | Synchronous hydraulic lifting device for circular accelerator |
| CN103722769A (en) * | 2013-12-19 | 2014-04-16 | 上海萨克斯动力总成部件系统有限公司 | Synchronous control system for press machines |
| CN107052210A (en) * | 2017-04-26 | 2017-08-18 | 天津市天锻压力机有限公司 | The constant strain control system and control method of Superplastic Isothermal Forging hydraulic press |
| CN108407383A (en) * | 2018-02-12 | 2018-08-17 | 佛山市宏德机器制造有限公司 | A kind of hydraulic press piston closed-loop control system |
| CN109947092A (en) * | 2019-01-23 | 2019-06-28 | 渊驰粉粒体技术（上海）有限公司 | A method of trolley travelling is controlled using program analog inverter |
-
2012
- 2012-07-25 CN CN 201220361797 patent/CN202826497U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103671305A (en) * | 2013-12-18 | 2014-03-26 | 中国原子能科学研究院 | Synchronous hydraulic lifting device for circular accelerator |
| CN103722769A (en) * | 2013-12-19 | 2014-04-16 | 上海萨克斯动力总成部件系统有限公司 | Synchronous control system for press machines |
| CN103722769B (en) * | 2013-12-19 | 2016-06-22 | 上海萨克斯动力总成部件系统有限公司 | The synchronous control system of forcing press |
| CN107052210A (en) * | 2017-04-26 | 2017-08-18 | 天津市天锻压力机有限公司 | The constant strain control system and control method of Superplastic Isothermal Forging hydraulic press |
| CN107052210B (en) * | 2017-04-26 | 2018-11-20 | 天津市天锻压力机有限公司 | The constant strain control system and control method of Superplastic Isothermal Forging hydraulic press |
| CN108407383A (en) * | 2018-02-12 | 2018-08-17 | 佛山市宏德机器制造有限公司 | A kind of hydraulic press piston closed-loop control system |
| CN109947092A (en) * | 2019-01-23 | 2019-06-28 | 渊驰粉粒体技术（上海）有限公司 | A method of trolley travelling is controlled using program analog inverter |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130327 Termination date: 20180725 |
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| CF01 | Termination of patent right due to non-payment of annual fee |