CN103398043B - Method, equipment and system for detecting internal leakage of oil cylinder and engineering machinery - Google Patents
Method, equipment and system for detecting internal leakage of oil cylinder and engineering machinery Download PDFInfo
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- CN103398043B CN103398043B CN201310328528.7A CN201310328528A CN103398043B CN 103398043 B CN103398043 B CN 103398043B CN 201310328528 A CN201310328528 A CN 201310328528A CN 103398043 B CN103398043 B CN 103398043B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008859 change Effects 0.000 claims abstract description 29
- 230000037452 priming Effects 0.000 claims description 45
- 230000002085 persistent effect Effects 0.000 claims description 6
- 230000001186 cumulative effect Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims 2
- 238000001514 detection method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 83
- 230000000750 progressive effect Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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Abstract
The invention discloses a method, equipment, a system and engineering machinery for detecting internal leakage of an oil cylinder, wherein the method comprises the following steps: receiving the current stroke of the oil cylinder; under the condition that the operation instruction of the oil cylinder is not received, recording the current stroke of the oil cylinder as an initial stroke; and after a preset time period since the current stroke of the oil cylinder is recorded as the initial stroke, calculating the difference between the current stroke of the oil cylinder and the initial stroke, and judging whether the internal leakage occurs according to the difference between the current stroke and the initial stroke. By the technical scheme, whether the internal leakage occurs or not can be judged according to the stroke change of the oil cylinder after the oil cylinder stops acting, so that timely and accurate detection can be realized when the internal leakage occurs to the oil cylinder.
Description
Technical field
The present invention relates to engineering machinery field, in particular it relates to a kind of for detecting method, equipment, system and the engineering machinery let out in oil cylinder.
Background technology
In many engineering machinery, oil cylinder is very general and important supporting mechanism, as supporting leg, jib are required for oil cylinder and realize supporting. Due to oil cylinder internal structure, technological problems, often occurring letting out in oil cylinder, namely the hydraulic oil within oil cylinder flows to another chamber from a chamber by piston, causes uncontrolled the moving toward some direction of oil cylinder piston.
In oil cylinder support process, letting out the instability that the lighter can cause oil cylinder to support in oil cylinder, severe one will cause severe safety problem. Therefore, carry out detection have very important significance to letting out in oil cylinder.
Summary of the invention
It is an object of the invention to provide a kind of for detecting method, equipment, system and the engineering machinery let out in oil cylinder, it can be let out in whether oil cylinder is occurred is detected.
To achieve these goals, the present invention provides a kind of for detecting the method let out in oil cylinder, and the method includes: receive the current stroke of described oil cylinder; And when being not received by described operation of oil cylinde instruction, record the current stroke of described oil cylinder as priming stroke; And from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke after, calculate the current stroke of described oil cylinder and the difference of described priming stroke, and according to deserving to let out in the front travel difference with priming stroke judges whether to occur.
Correspondingly, the present invention also provides for that a kind of this equipment includes: receptor for detecting the equipment let out in oil cylinder, is used for receiving oil cylinder stroke; And controller, for when being not received by operation of oil cylinde instruction, recording the current stroke of described oil cylinder as priming stroke; And from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke after, calculate the current stroke of described oil cylinder and the difference of described priming stroke, and according to deserving to let out in the front travel difference with priming stroke judges whether to occur.
Correspondingly, the present invention also provides for a kind of for detecting the system let out in oil cylinder, and this system includes: operation of oil cylinde device, for output cylinder operational order; Device for detecting distance of travel, for detecting the stroke of described oil cylinder; And the said equipment.
Correspondingly, the present invention also provides for a kind of engineering machinery, and this engineering machinery includes said system.
By technique scheme, can, after oil cylinder stops action, judge whether to let out in generation according to the change of its stroke, thus when can let out in oil cylinder occurs, it is achieved in time, detect accurately.
Other features and advantages of the present invention will be described in detail in detailed description of the invention part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and constitutes the part of description, is used for explaining the present invention, but is not intended that limitation of the present invention together with detailed description below. In the accompanying drawings:
Fig. 1 is the structural representation for detecting the system let out in oil cylinder provided by the invention;
Fig. 2 A and 2B is oil cylinder stroke change schematic diagram;
Fig. 3 is jib angle sensor mounting location schematic diagram; And
Fig. 4 is the flow chart for detecting the method let out in oil cylinder provided by the invention.
Description of reference numerals
10 operation of oil cylinde device 20 device for detecting distance of travel
30 receptor 40 controllers
50 electromagnetic valve 60 oil cylinders
21 angular transducers
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail. It should be appreciated that detailed description of the invention described herein is merely to illustrate and explains the present invention, it is not limited to the present invention.
The invention provides a kind of for detecting the system let out in oil cylinder, this system includes: operation of oil cylinde device 10(such as control crank or remote controller), for output cylinder operational order; Device for detecting distance of travel 20, for detecting the stroke of described oil cylinder; And for detecting the equipment let out in oil cylinder, this equipment includes: receptor 30, is used for receiving operation of oil cylinde instruction and oil cylinder stroke; And controller 40, for when receiving described oil cylinder control command, exporting corresponding electric current to electromagnetic valve 50, to control oil cylinder 60 action; When being not received by described operation of oil cylinde instruction (now, oil cylinder stopping action, in-oil cylinder hydraulic oil can be locked out), record the current stroke of described oil cylinder as priming stroke; And from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke after, calculate the current stroke of described oil cylinder and the difference of described priming stroke, according to the difference (that is, stroke amplitude of variation) deserving front travel and priming stroke, it may be judged whether let out in generation. Such as, when this difference is more than a certain predetermined difference value, it is judged that let out in generation. Thereby, can, after oil cylinder stops action, judge whether to let out in generation according to the change of its stroke, thus when can let out in oil cylinder occurs, it is achieved in time, detect accurately.
Described device for detecting distance of travel can be displacement transducer, this displacement transducer concretely magnetic hysteresis telescoping sensor, and this sensor is installed on inside oil cylinder, and detection piston is in the position within oil cylinder, thus drawing the stroke of piston; Displacement transducer can also be stay wire sensor. As shown in Figure 2 A, in an initial condition, the stroke of oil cylinder rodless cavity is L1. Letting out in assuming and cause that piston is to rodless cavity side shifting, as shown in Figure 2 B, now the stroke of oil cylinder rodless cavity is L2, its with original state under the difference �� L of stroke L1 then can represent stroke amplitude of variation.
For the situation that described oil cylinder is arm support oil cylinder, described device for detecting distance of travel can be also angular transducer 21(as shown in Figure 3), this angular transducer can detect the inclination angle of two arm segment, and according to the angle between this Dip countion two arm segment, according to this angle and trigonometric function relation, the stroke of the oil cylinder being connected between this two arm segment can be calculated. It is to say, oil cylinder stroke can be represented by the angle between arm joint.
It is said that in general, after stopping operation oil cylinder, oil cylinder stroke is likely to produce change because of vibration. But the stroke change that vibration causes is periodic, and decays gradually, and in let out the stroke change caused relatively slow, and be the change toward a direction tendency. Preferably, the oil cylinder stroke received can be processed by described controller, filters cyclically-varying and the component decayed gradually, obtain the trend of stroke change to. This process can be realized by such as low pass filter.
The foregoing describe the mode let out in generation by comparing the difference of current stroke and described priming stroke to judge whether, but let out in judging according only to progressive error and be difficult to reflect situation of letting out in reality more really, because after each operating cyloinder, capital rejudges, if operation of oil cylinde frequency is higher, then judging that the time is shorter, progressive error amplitude of variation is also less, is sometimes difficult to make effective judgement. Preferably, described controller can be additionally operable to: the persistent period according to the difference of described current stroke and priming stroke and described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change; According to difference and the stroke pace of change of deserving front travel and priming stroke this described, it is determined that stroke intensity of variation; And according to the trip intensity of variation, it may be judged whether let out in generation. Fig. 3 illustrates the flow chart of this process.
Hereinafter the trip intensity of variation is calculated process to be described in detail.
(1) setting progressive error as �� L, and stroke amplitude of variation is divided into 3 rank f (�� L) by the size according to �� L, expression formula is as follows:
(2) stroke pace of change is also classified into 3 rank g (�� v): set stroke pace of change asReferring to the stroke change of unit interval, wherein T is the time spent causing progressive error �� L.
(3) according to stroke amplitude of variation rank f (�� L) and stroke pace of change rank g (�� v) comprehensive assessment stroke intensity of variation, for instance available FUZZY ALGORITHMS FOR CONTROL, appraisal procedure is as follows:
By high, medium and low for the value of stroke amplitude of variation rank f (�� L) respectively with numeric representation, such as represent 3,2,1 respectively. In like manner, stroke pace of change rank g (�� v) value is also carried out digitized, then utilizes equation below
Y=�� f (�� L)+(1-��) g (�� v) (0�ܦ���1)
The weighing factor of stroke intensity of variation is carried out value according to stroke pace of change rank and stroke amplitude of variation rank by factor alpha. Stroke intensity of variation H is also classified into high, medium and low three ranks by the size according to value of calculation y.
Stroke intensity of variation calculation given above is only to consider an example of the consideration mode of stroke amplitude of variation and stroke pace of change, and the present invention is not limited to this.
Preferably, described controller can after described predetermined amount of time terminates, every described predetermined amount of time: the persistent period according to the difference of described current stroke and priming stroke and described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change; According to difference and the stroke pace of change of deserving front travel and priming stroke this described, it is determined that stroke intensity of variation; And according to the trip intensity of variation, it may be judged whether let out in generation. Thereby, oil cylinder can be stopped operation after stroke intensity of variation detect in real time.
But, judge that stroke intensity of variation possibility can not reflect in reality situation of letting out comprehensively really according only to stroke amplitude of variation and stroke pace of change, because after each operating cyloinder, capital rejudges, if operation of oil cylinde frequency is higher, then judging that the time is shorter, progressive error amplitude of variation and speed are also less, and situation about actually letting out in oil cylinder is likely to still very serious.Preferably, described controller is additionally operable to: when described stroke intensity of variation is more than predetermined stroke intensity of variation, it is determined that let out in generation, and when determine let out in generation, let out number of times in cumulative. These interior several oil cylinders let out in during number of times can stop operation for representing multiple oil cylinders are let out in there occurs during stopping operation, say, that this interior number of times of letting out stops operation period for oil cylinder. Above-mentioned every letting out degree in predetermined amount of time is determined and judging whether that according to this interior degree of letting out the mode let out in generation may result in repeatedly judging during an oil cylinder stops operation to let out in generation, but in actually only accumulating once, let out number of times, namely an oil cylinder lets out number of times in stopping operation and only accumulating once in period. Certainly, present invention is also not necessarily limited to this, it is also feasible that an oil cylinder lets out number of times in repeatedly adding up during stopping operation. It addition, after carrying out some oil cylinder malfunction eliminations, this interior number of times of letting out can manually be reset.
Described controller is additionally operable to: when described stroke intensity of variation and/or described in let out number of times more than corresponding preset value, export corresponding alarm signal. Such as, can be high, medium and low according to stroke intensity of variation, export the alarm signal of high, medium and low three ranks respectively. If inside letting out number of times more than preset value, regardless of the stroke intensity of variation now judged, all exportable very high level warning. Thereby, operator can be reminded to note letting out in oil cylinder situation, repair in time, it is prevented that the generation of security incident.
Correspondingly, present invention also offers a kind of for detecting the method let out in oil cylinder, the method includes: receive oil cylinder stroke; And when being not received by operation of oil cylinde instruction, record the current stroke of described oil cylinder as priming stroke; And from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke after, calculate the current stroke of described oil cylinder and the difference of described priming stroke, and according to deserving to let out in the front travel difference with priming stroke judges whether to occur. Detail about the method is identical with the said equipment, and in, shown in Fig. 4, repeating no more in this.
Correspondingly, present invention also offers a kind of engineering machinery, this engineering machinery includes said system.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing; but; the present invention is not limited to the detail in above-mentioned embodiment; in the technology concept of the present invention; technical scheme can being carried out multiple simple variant, these simple variant belong to protection scope of the present invention.
It is further to note that each the concrete technical characteristic described in above-mentioned detailed description of the invention, in reconcilable situation, it is possible to be combined by any suitable mode. In order to avoid unnecessary repetition, various possible compound modes are no longer illustrated by the present invention separately.
Additionally, can also carry out combination in any between the various different embodiment of the present invention, as long as it is without prejudice to the thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (14)
1., for detecting the method let out in oil cylinder, the method includes:
Receive the current stroke of described oil cylinder; And
When being not received by operation of oil cylinde instruction,
Record the current stroke of described oil cylinder as priming stroke; And
After from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke, the cyclically-varying filtering oil cylinder stroke and the component decayed gradually, and calculate the current stroke of described oil cylinder and the difference of described priming stroke, and judge whether to let out in generation according to deserving the front travel difference with priming stroke.
2. method according to claim 1, it is characterised in that described in judge whether to occur in let out and include:
Difference according to described current stroke and priming stroke and the persistent period of described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change;
Difference according to described current stroke and priming stroke and stroke pace of change, it is determined that stroke intensity of variation; And
According to the trip intensity of variation, it may be judged whether let out in generation.
3. method according to claim 2, it is characterised in that the method also includes: after described predetermined amount of time, every described predetermined amount of time:
Difference according to described current stroke and priming stroke and the persistent period of described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change;
Difference according to described current stroke and priming stroke and stroke pace of change, it is determined that stroke intensity of variation; And
According to the trip intensity of variation, it may be judged whether let out in generation.
4. the method according to any one of claim 1-3, it is characterised in that the method also includes:
When determine let out in generation, let out number of times in cumulative; And
When letting out number of times more than corresponding preset value in described, export corresponding alarm signal.
5. according to the method in claim 2 or 3, it is characterised in that the method also includes:
When described stroke intensity of variation is more than corresponding preset value, export corresponding alarm signal.
6. method according to claim 1, it is characterised in that described oil cylinder is arm support oil cylinder, priming stroke and the current stroke of described oil cylinder are represented by the angle between arm joint.
7., for detecting the equipment let out in oil cylinder, this equipment includes:
Receptor, is used for receiving oil cylinder stroke; And
Controller, is used for when being not received by operation of oil cylinde instruction,
Record the current stroke of described oil cylinder as priming stroke; And
After from the current stroke recording described oil cylinder as a predetermined amount of time priming stroke, the cyclically-varying filtering oil cylinder stroke and the component decayed gradually, and calculate the current stroke of described oil cylinder and the difference of described priming stroke, and judge whether to let out in generation according to deserving the front travel difference with priming stroke.
8. equipment according to claim 7, it is characterised in that described in judge whether to occur in let out and include:
Difference according to described current stroke and priming stroke and the persistent period of described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change;
Difference according to described current stroke and priming stroke and stroke pace of change, it is determined that stroke intensity of variation; And
According to the trip intensity of variation, it may be judged whether let out in generation.
9. equipment according to claim 8, it is characterised in that described controller is additionally operable to after described predetermined amount of time, every described predetermined amount of time:
Difference according to described current stroke and priming stroke and the persistent period of described predetermined amount of time, calculate described oil cylinder from described priming stroke to current stroke during stroke pace of change;
Difference according to described current stroke and priming stroke and stroke pace of change, it is determined that stroke intensity of variation; And
According to the trip intensity of variation, it may be judged whether let out in generation.
10. the equipment according to any one of claim 7-9, it is characterised in that described controller is additionally operable to:
When determine let out in generation, let out number of times in cumulative; And
When letting out number of times more than corresponding preset value in described, export corresponding alarm signal.
11. equipment according to claim 8 or claim 9, it is characterised in that described controller is additionally operable to:
When described stroke intensity of variation is more than corresponding preset value, export corresponding alarm signal.
12. equipment according to claim 7, it is characterised in that described oil cylinder is arm support oil cylinder, priming stroke and the current stroke of described oil cylinder are represented by the angle between arm joint.
13. for detecting the system let out in oil cylinder, this system includes:
Operation of oil cylinde device, for output cylinder operational order;
Device for detecting distance of travel, for detecting the stroke of described oil cylinder; And
Equipment according to any one of claim 7-12.
14. an engineering machinery, it is characterised in that this engineering machinery includes system according to claim 13.
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| CN201310328528.7A CN103398043B (en) | 2013-07-31 | 2013-07-31 | Method, equipment and system for detecting internal leakage of oil cylinder and engineering machinery |
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| CN201310328528.7A CN103398043B (en) | 2013-07-31 | 2013-07-31 | Method, equipment and system for detecting internal leakage of oil cylinder and engineering machinery |
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| CN103398043B true CN103398043B (en) | 2016-06-08 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105465101B (en) * | 2014-10-23 | 2018-12-11 | 徐州重型机械有限公司 | A kind of hydraulic cylinder internal leakage detection device and device |
| CN104533882B (en) * | 2014-12-19 | 2017-02-22 | 三一汽车起重机械有限公司 | Diagnosis method and system for leakage fault of oil cylinders |
| CN106402085A (en) * | 2016-10-17 | 2017-02-15 | 陕西晟思智能测控有限公司 | Signal pretreatment method for magnetic-grid-like hydraulic cylinder integrated displacement sensor |
| CN113477721B (en) * | 2021-07-14 | 2022-11-01 | 宝钢日铁汽车板有限公司 | Method for monitoring working states of steel coil trolley and walking beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05196004A (en) * | 1992-01-20 | 1993-08-06 | Komatsu Ltd | Automatic cushioning controller for work machine cylinder |
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|---|---|---|---|---|
| CN1227918A (en) * | 1998-11-30 | 1999-09-08 | 浙江大学 | Leakage fault diagnosing method for hydraulic system |
| CN102435158A (en) * | 2011-09-05 | 2012-05-02 | 中联重科股份有限公司 | Method, device and system for measuring length of boom cylinder |
| CN202485867U (en) * | 2012-01-13 | 2012-10-10 | 宝山钢铁股份有限公司 | Internal leakage detection device for large-scale hydraulic servo oil cylinder |
Non-Patent Citations (1)
| Title |
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