CN114412877A - Hydraulic cylinder displacement jump identification method and device - Google Patents
Hydraulic cylinder displacement jump identification method and device Download PDFInfo
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- CN114412877A CN114412877A CN202111603936.XA CN202111603936A CN114412877A CN 114412877 A CN114412877 A CN 114412877A CN 202111603936 A CN202111603936 A CN 202111603936A CN 114412877 A CN114412877 A CN 114412877A
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000002159 abnormal effect Effects 0.000 claims abstract description 45
- 238000001514 detection method Methods 0.000 claims abstract description 45
- 238000005070 sampling Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 description 3
- 238000013500 data storage Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000013024 troubleshooting Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/28—Means for indicating the position, e.g. end of stroke
- F15B15/2815—Position sensing, i.e. means for continuous measurement of position, e.g. LVDT
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Fluid Mechanics (AREA)
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- Fluid-Pressure Circuits (AREA)
Abstract
The invention provides a method and a device for identifying displacement jump of a hydraulic cylinder, which comprise the following steps: acquiring position detection values of a hydraulic cylinder at a plurality of adjacent moments, and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values; if the displacement of the hydraulic cylinder is smaller than the first threshold value, acquiring a directional valve signal of the hydraulic cylinder, and judging whether the displacement of the hydraulic cylinder is abnormal or not according to the directional valve signal; if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value; the invention can improve the stability and accuracy of hydraulic cylinder fault detection and positioning and ensure the smooth operation of production operation.
Description
Technical Field
The invention relates to the field of intelligent steel rolling production application, in particular to a method and a device for identifying displacement jump of a hydraulic cylinder.
Background
The displacement sensor is an important detection element of equipment in the field of steel rolling production, and when the displacement sensor of the hydraulic cylinder has a dead value, the equipment is easy to stop, and the equipment is disordered in action and other faults are easily caused. The traditional method relies on manual troubleshooting, a large amount of time is consumed, the problem is difficult to locate, the production efficiency is greatly reduced, and the labor cost is increased.
Disclosure of Invention
In view of the problems in the prior art, the invention provides a method and a device for identifying the displacement jump of a hydraulic cylinder, which mainly solve the problems that the traditional troubleshooting of the hydraulic cylinder depends on manpower, and the stability and the efficiency are difficult to guarantee.
In order to achieve the above and other objects, the present invention adopts the following technical solutions.
A hydraulic cylinder displacement jump identification method comprises the following steps:
acquiring position detection values of a hydraulic cylinder at a plurality of adjacent moments, and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values;
if the displacement of the hydraulic cylinder is smaller than the first threshold value, acquiring a directional valve signal of the hydraulic cylinder, and judging whether the displacement of the hydraulic cylinder is abnormal or not according to the directional valve signal;
and if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value.
Optionally, acquiring position detection values of the hydraulic cylinder at a plurality of adjacent moments, and determining whether the displacement of the hydraulic cylinder is smaller than a first threshold value according to the position detection values, includes:
presetting sampling periods, and acquiring a position detection value at a corresponding moment in each sampling period;
acquiring a difference value between a position detection value at the latest moment and a position detection value at each previous moment as a displacement amount of the hydraulic cylinder between corresponding moments;
and if more than two displacement amounts exist in a preset time interval and are simultaneously smaller than the first threshold value, outputting a judgment mark.
Optionally, after two or more displacement amounts within a preset time interval are smaller than the first threshold, the method further includes:
acquiring a difference value between a position detection value corresponding to a sampling period after a preset time delay and a previously acquired position detection value;
and if the difference value is still smaller than the first threshold value, outputting the distinguishing mark.
Optionally, if the displacement of the hydraulic cylinder is smaller than the first threshold, acquiring a directional valve signal of the hydraulic cylinder, and determining whether the displacement of the hydraulic cylinder is abnormal according to the directional valve signal includes:
the directional valve signal comprises a forward signal and a reverse signal, the directional valve signal is obtained, and whether the forward signal and the reverse signal in the directional valve signal disappear simultaneously or not is judged;
if the forward signal and the reverse signal disappear simultaneously, the hydraulic cylinder is in a normal stop state;
if one of the forward signal and the reverse signal does not disappear, the hydraulic cylinder is at a displacement dead value at present, and the hydraulic cylinder is output to be abnormal in displacement.
Optionally, if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value, where the method includes:
comparing the feedback signal with a preset feedback value range, and if the feedback signal exceeds the feedback value range, outputting a fault of a proportional amplifier;
if the feedback signal is within the feedback value range, acquiring a pressure value of the directional valve, and judging whether the pressure value is smaller than a preset pressure threshold value;
and if the pressure value is smaller than the pressure threshold value, outputting preset abnormal overhaul prompt information.
A hydraulic cylinder displacement jump recognition device comprises: a displacement sensing module, a pressure sensing module and a control module,
the control module is used for acquiring position detection values of the hydraulic cylinder at a plurality of adjacent moments from the displacement sensing module and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values; if the displacement of the hydraulic cylinder is smaller than the first threshold value, the control module acquires a direction valve signal of the hydraulic cylinder and judges whether the displacement of the hydraulic cylinder is abnormal or not according to the direction valve signal; and if the hydraulic cylinder is abnormal in displacement, the control module acquires a feedback signal of a proportional amplifier of the hydraulic cylinder or acquires a pressure value of the directional valve from the pressure sensing module, and outputs abnormal information according to the feedback signal or the pressure value.
Optionally, the device further includes a display unit, where the display unit is connected to the control module, and acquires the abnormal information output by the control module.
As described above, the method and the device for identifying the displacement jump of the hydraulic cylinder according to the present invention have the following advantages.
The hydraulic cylinder abnormity judgment is carried out according to the displacement of the hydraulic cylinder and the combination of a directional valve signal, the abnormity detection is automatically completed, the abnormity self-detection positioning is carried out according to a feedback signal of the proportional amplifier and a pressure value of the directional valve, the whole process of automatic abnormity detection and positioning is completed, the height stability is achieved, the abnormity overhaul efficiency can be greatly improved, and the production and production normal operation are guaranteed.
Drawings
Fig. 1 is a schematic flow chart of a hydraulic cylinder displacement jump identification method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a hydraulic cylinder displacement jump recognition device according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1, the present invention provides a method for identifying a displacement jump of a hydraulic cylinder, including the following steps.
Step S01, acquiring position detection values of a plurality of adjacent moments of the hydraulic cylinder, and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value according to the position detection values;
step S02, if the displacement of the hydraulic cylinder is smaller than the first threshold value, acquiring a directional valve signal of the hydraulic cylinder, and judging whether the displacement of the hydraulic cylinder is abnormal or not according to the directional valve signal;
and step S03, if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value.
In one embodiment, acquiring position detection values of a hydraulic cylinder at a plurality of adjacent moments, and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value according to the position detection values comprises:
presetting sampling periods, and acquiring a position detection value at a corresponding moment in each sampling period;
acquiring a difference value between a position detection value at the latest moment and a position detection value at each previous moment as a displacement amount of the hydraulic cylinder between corresponding moments;
and if more than two displacement amounts exist in a preset time interval and are simultaneously smaller than the first threshold value, outputting a judgment mark.
In an embodiment, if two or more displacement amounts exist within a preset time interval and are simultaneously smaller than the first threshold, the method further includes:
acquiring a difference value between a position detection value corresponding to a sampling period after a preset time delay and a previously acquired position detection value;
and if the difference value is still smaller than the first threshold value, outputting the distinguishing mark.
Specifically, a displacement sensor may be mounted on the hydraulic cylinder for detecting a real-time position detection value of the hydraulic cylinder. The displacement sensor value can be read in real time by the control terminal and stored in the data storage area 1 as X1, the displacement sensor value is temporarily stored in the data storage area 2 as X2 in the next clock cycle, and the displacement sensor value is temporarily stored in the data storage area 3 as X3 in the next clock cycle. And repeatedly reading and storing the position detection value in the corresponding sampling period.
Further, the first threshold may be set according to actual production requirements, and may be a value close to 0. When calculating the displacement of the hydraulic cylinder, a plurality of sets of position detection values can be selected as required for calculation, wherein only two sets of position detection values are taken as an example, X3 is subtracted by X2, X3 is subtracted by X1, if the two values are equal to zero, the judgment result is retained, the judgment is continued by using the new value after the delay of 1S, and if the value is still zero, a judgment mark is output. The delay time can be set according to the actual application requirement, and is not limited here.
In an embodiment, if the displacement of the hydraulic cylinder is smaller than the first threshold, acquiring a directional valve signal of the hydraulic cylinder, and determining whether the displacement of the hydraulic cylinder is abnormal according to the directional valve signal includes:
the directional valve signal comprises a forward signal and a reverse signal, the directional valve signal is obtained, and whether the forward signal and the reverse signal in the directional valve signal disappear simultaneously or not is judged;
if the forward signal and the reverse signal disappear simultaneously, the hydraulic cylinder is in a normal stop state;
if one of the forward signal and the reverse signal does not disappear, the hydraulic cylinder is at a displacement dead value at present, and the hydraulic cylinder is output to be abnormal in displacement.
Specifically, after the judgment mark is obtained, the signal of the hydraulic cylinder direction valve at the moment is further judged, if the positive and negative signals of the direction valve disappear simultaneously, the hydraulic cylinder is judged to stop operating normally, the value of the displacement sensor belongs to normal stop change, and no fault signal is output. If one of the positive and negative signals of the directional valve does not disappear, outputting a displacement sensor dead value.
In an embodiment, if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value, including:
comparing the feedback signal with a preset feedback value range, and if the feedback signal exceeds the feedback value range, outputting a fault of a proportional amplifier;
if the feedback signal is within the feedback value range, acquiring a pressure value of the directional valve, and judging whether the pressure value is smaller than a preset pressure threshold value;
and if the pressure value is smaller than the pressure threshold value, outputting preset abnormal overhaul prompt information.
Specifically, if the displacement sensor is at a dead value, the hydraulic cylinder is in an abnormal state at this time, and further, a feedback signal of the proportional amplifier at this time is determined, and if the feedback signal is abnormal, a fault of the proportional amplifier is output. If no abnormal condition exists, the pressure in the same direction as the directional valve is judged, and if the pressure is smaller than a set value, auxiliary information is output to check the hydraulic pipeline and the hydraulic cylinder. If the pressure is larger than the set value, no auxiliary information is output. The auxiliary information may include preset information such as a maintenance mode, a maintenance step, and a notice corresponding to the location of the fault. The specific content can be flexibly configured according to the requirement, and is not limited here.
The embodiment also provides a hydraulic cylinder displacement jump identification device, which is used for executing the hydraulic cylinder displacement jump identification method in the foregoing method embodiment. Since the technical principle of the system embodiment is similar to that of the method embodiment, repeated description of the same technical details is omitted.
In one embodiment, the hydraulic cylinder displacement jump identification device includes: the control module is used for acquiring position detection values of the hydraulic cylinder at a plurality of adjacent moments from the displacement sensing module and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values; if the displacement of the hydraulic cylinder is smaller than the first threshold value, the control module acquires a direction valve signal of the hydraulic cylinder and judges whether the displacement of the hydraulic cylinder is abnormal or not according to the direction valve signal; and if the hydraulic cylinder is abnormal in displacement, the control module acquires a feedback signal of a proportional amplifier of the hydraulic cylinder or acquires a pressure value of the directional valve from the pressure sensing module, and outputs abnormal information according to the feedback signal or the pressure value.
In one embodiment, the device further comprises a display unit, wherein the display unit is connected with the control module and acquires the abnormal information output by the control module.
Specifically, referring to fig. 2, the displacement sensing module may employ a displacement sensor, the control module may employ a controller such as a single chip microcomputer or an MCU, the displacement sensor, the directional valve, the pressure sensor P and the proportional amplifier are respectively connected to the controller through the I/O port, and the controller outputs the recognition result through the display unit. The display unit can adopt conventional display equipment such as an LED display screen, a touch display screen and the like.
In summary, according to the method and the device for identifying the displacement jump of the hydraulic cylinder, disclosed by the invention, the abnormal automatic detection and positioning of the hydraulic cylinder are carried out by identifying the feedback signals of the directional valve and the proportional amplifier of the hydraulic cylinder and the oil outlet pressure signal of the hydraulic cylinder and combining the position value change conditions of the displacement sensor in a plurality of clock periods, so that the abnormal response can be quickly carried out, the abnormal interactive output can be completed, the problem positioning and overhauling efficiency can be improved, and the smooth production work can be effectively ensured. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. A method for identifying displacement jump of a hydraulic cylinder is characterized by comprising the following steps:
acquiring position detection values of a hydraulic cylinder at a plurality of adjacent moments, and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values;
if the displacement of the hydraulic cylinder is smaller than the first threshold value, acquiring a directional valve signal of the hydraulic cylinder, and judging whether the displacement of the hydraulic cylinder is abnormal or not according to the directional valve signal;
and if the hydraulic cylinder is abnormal in displacement, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value.
2. The method for recognizing the hydraulic cylinder displacement jump according to claim 1, wherein the step of acquiring position detection values of the hydraulic cylinder at a plurality of adjacent moments and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value according to the position detection values comprises the steps of:
presetting sampling periods, and acquiring a position detection value at a corresponding moment in each sampling period;
acquiring a difference value between a position detection value at the latest moment and a position detection value at each previous moment as a displacement amount of the hydraulic cylinder between corresponding moments;
and if more than two displacement amounts exist in a preset time interval and are simultaneously smaller than the first threshold value, outputting a judgment mark.
3. The method for recognizing hydraulic cylinder displacement jump according to claim 2, further comprising, after two or more displacement amounts are smaller than the first threshold value within a preset time interval:
acquiring a difference value between a position detection value corresponding to a sampling period after a preset time delay and a previously acquired position detection value;
and if the difference value is still smaller than the first threshold value, outputting the distinguishing mark.
4. The method for recognizing hydraulic cylinder displacement jump according to claim 1, wherein if the displacement of the hydraulic cylinder is smaller than the first threshold, acquiring a directional valve signal of the hydraulic cylinder, and determining whether the hydraulic cylinder displacement is abnormal according to the directional valve signal comprises:
the directional valve signal comprises a forward signal and a reverse signal, the directional valve signal is obtained, and whether the forward signal and the reverse signal in the directional valve signal disappear simultaneously or not is judged;
if the forward signal and the reverse signal disappear simultaneously, the hydraulic cylinder is in a normal stop state;
if one of the forward signal and the reverse signal does not disappear, the hydraulic cylinder is at a displacement dead value at present, and the hydraulic cylinder is output to be abnormal in displacement.
5. The method for recognizing hydraulic cylinder displacement jump according to claim 1, wherein if the hydraulic cylinder displacement is abnormal, acquiring a feedback signal of a proportional amplifier of the hydraulic cylinder or a pressure value of the directional valve, and outputting abnormal information according to the feedback signal or the pressure value comprises:
comparing the feedback signal with a preset feedback value range, and if the feedback signal exceeds the feedback value range, outputting a fault of a proportional amplifier;
if the feedback signal is within the feedback value range, acquiring a pressure value of the directional valve, and judging whether the pressure value is smaller than a preset pressure threshold value;
and if the pressure value is smaller than the pressure threshold value, outputting preset abnormal overhaul prompt information.
6. A hydraulic cylinder displacement jump recognition device, characterized by includes: a displacement sensing module, a pressure sensing module and a control module,
the control module is used for acquiring position detection values of the hydraulic cylinder at a plurality of adjacent moments from the displacement sensing module and judging whether the displacement of the hydraulic cylinder is smaller than a first threshold value or not according to the position detection values; if the displacement of the hydraulic cylinder is smaller than the first threshold value, the control module acquires a direction valve signal of the hydraulic cylinder and judges whether the displacement of the hydraulic cylinder is abnormal or not according to the direction valve signal; and if the hydraulic cylinder is abnormal in displacement, the control module acquires a feedback signal of a proportional amplifier of the hydraulic cylinder or acquires a pressure value of the directional valve from the pressure sensing module, and outputs abnormal information according to the feedback signal or the pressure value.
7. The device for recognizing the displacement jump of the hydraulic cylinder according to claim 6, further comprising a display unit, wherein the display unit is connected with the control module and acquires the abnormal information output by the control module.
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| CN202111603936.XA CN114412877A (en) | 2021-12-24 | 2021-12-24 | Hydraulic cylinder displacement jump identification method and device |
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| CN202111603936.XA CN114412877A (en) | 2021-12-24 | 2021-12-24 | Hydraulic cylinder displacement jump identification method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001140809A (en) * | 1999-11-09 | 2001-05-22 | Hitachi Constr Mach Co Ltd | Device for diagnosing failure of hydraulic cylinder |
| KR102040081B1 (en) * | 2019-08-30 | 2019-12-05 | 정엔지니어링 주식회사 | Actuator anomaly detection system |
| CN110821759A (en) * | 2019-12-13 | 2020-02-21 | 北京三力新能科技有限公司 | Hydraulic variable propeller fault rapid positioning and safe shutdown method |
| CN111677718A (en) * | 2020-05-29 | 2020-09-18 | 中国石油天然气集团有限公司 | Hydraulic cylinder unit abnormity monitoring and handling method suitable for rotary steering system |
| CN112462337A (en) * | 2020-02-28 | 2021-03-09 | 加特兰微电子科技(上海)有限公司 | Method for detecting interference signal, method for suppressing mutual interference, device for suppressing mutual interference, sensor and equipment |
-
2021
- 2021-12-24 CN CN202111603936.XA patent/CN114412877A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001140809A (en) * | 1999-11-09 | 2001-05-22 | Hitachi Constr Mach Co Ltd | Device for diagnosing failure of hydraulic cylinder |
| KR102040081B1 (en) * | 2019-08-30 | 2019-12-05 | 정엔지니어링 주식회사 | Actuator anomaly detection system |
| CN110821759A (en) * | 2019-12-13 | 2020-02-21 | 北京三力新能科技有限公司 | Hydraulic variable propeller fault rapid positioning and safe shutdown method |
| CN112462337A (en) * | 2020-02-28 | 2021-03-09 | 加特兰微电子科技(上海)有限公司 | Method for detecting interference signal, method for suppressing mutual interference, device for suppressing mutual interference, sensor and equipment |
| CN111677718A (en) * | 2020-05-29 | 2020-09-18 | 中国石油天然气集团有限公司 | Hydraulic cylinder unit abnormity monitoring and handling method suitable for rotary steering system |
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