CN103471755A - Cantilever crane safety early warning method, device and system - Google Patents
Cantilever crane safety early warning method, device and system Download PDFInfo
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Abstract
The invention provides a safety early warning method, device and system for an arm support. The safety early warning method for the arm support comprises the following steps: acquiring stress at a preset position of a cantilever in an operating state in real time; and calculating the change rate of the stress, and giving an early warning if the change rate exceeds a preset range. The invention detects the change rate of the stress in real time, when the change rate of the stress exceeds a preset range, the crack is possibly generated, at the moment, the early warning can be generated to remind an operator to make remedial measures in time and reduce the loss, the accident of arm support breakage can be effectively prevented, the safety of the system is improved, and the personal safety is protected.
Description
Technical field
The present invention relates to control field, more specifically, relate to a kind of arm support safe method for early warning, device and system.
Background technology
The accident of jib fracture in use, likely occurs in pump truck, all can bring very large economic loss and cause very bad social influence at every turn.Prior art, for fear of the accident of jib fracture, adopts the design that margin of safety is large more, therefore, occurs that the possibility of fracture is very little.
Yet concrete mixer has turned to the future development of overlength, equal life now, need continuous loss of weight and lengthening.Traditional Life Design large more than needed is abandoned.New design concept is brought new problem, is due to factors such as fault in material, manufacturing defect, improper uses, causes jib when working in the badness that surpasses design, and the jib fracture very easily occurs, and has great potential safety hazard.In prior art, also this situation is not carried out the method and apparatus of effective safe early warning.
Summary of the invention
The present invention aims to provide a kind of arm support safe method for early warning, device and the system that can carry out early warning to the jib fracture.
For solving the problems of the technologies described above, according to a first aspect of the invention, provide a kind of arm support safe method for early warning, comprising: the stress of jib pre-position under the Real-time Obtaining job state; The rate of change of calculated stress, if when rate of change surpasses preset range, early warning.
Further, the stress sensitive zone of precalculated position index arm frame.
Further, rate of change comprises total rate of change, and total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that obtain in this certain working time, and when total rate of change surpasses the first predetermined value, early warning.
Further, rate of change also comprises rate of change at times, and a certain working time is divided into a plurality of continuous time periods, and rate of change refers to the slope of the fitting a straight line of all stress that obtain in each time period at times, when rate of change at times surpasses the second predetermined value, early warning.
Further, the arm support safe method for early warning also comprises: when entering new operating mode, the irregular noise of filtering, then start to calculate rate of change.
Further, the arm support safe method for early warning also comprises: obtain the calibration stress of jib when predetermined attitude under non-job state; Obtain pre-stored, corresponding with predetermined attitude standard stress; Comparison calibration stress and standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.
Further, predetermined attitude comprises receipts arm state or extended configuration.
According to a second aspect of the invention, provide a kind of arm support safe prior-warning device, having comprised: the stress sensing unit, for the stress of jib pre-position under the Real-time Obtaining job state; Control module, be connected with the stress sensing unit, sends early warning signal for the rate of change of calculated stress and when rate of change surpasses preset range.
Further, the stress sensitive zone of precalculated position index arm frame.
Further, rate of change comprises total rate of change, and total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that this certain working time internal stress sensing unit obtains, when total rate of change surpasses the first predetermined value, control module generates early warning signal.
Further, rate of change also comprises rate of change at times, the a certain working time is divided into a plurality of continuous time periods, rate of change refers to the slope of the fitting a straight line of all stress that each time period internal stress sensing unit obtains at times, when rate of change at times surpasses the second predetermined value, control module generates early warning signal.
Further, the arm support safe prior-warning device also comprises: filter unit is electrically connected to control module, for the irregular noise of filtering when entering new operating mode.
Further, control module obtains calibration stress and pre-stored, with the predetermined attitude corresponding standard stress of jib when predetermined attitude under non-job state, and comparison calibration stress and standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.
According to a third aspect of the present invention, provide a kind of arm support safe early warning system, having comprised: the arm support safe prior-warning device, the arm support safe prior-warning device is above-mentioned arm support safe prior-warning device; Tractor driver's controller, be connected with the communication of arm support safe prior-warning device, for reporting to the police and driver operation.
The present invention detects the rate of change of stress in real time; when the rate of change of stress surpasses preset range; show crackle may occur; now; early warning can occur, and to remind operating personnel to make in time remedial measures, to reduce loss, can effectively prevent the accident of jib fracture; improve the security of system, protected personal safety.
The accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention the present invention does not form inappropriate limitation of the present invention for explaining.In the accompanying drawings:
Fig. 1 has schematically shown a scheme of installation of the stress acquiring unit in the present invention;
Fig. 2 has schematically shown another scheme of installation of the stress acquiring unit in the present invention;
Fig. 3 has schematically shown the STRESS VARIATION figure of an arm joint in a certain jib;
Fig. 4 has schematically shown the scheme of installation of arm support safe prior-warning device;
Fig. 5 has schematically shown the schematic diagram of arm support safe prior-warning device; And
Fig. 6 has schematically shown the schematic diagram of tractor driver's controller.
Reference numeral in figure: 10, stress sensing unit; 20, installing plate; 30, control module; 40, alarm unit; 50, data transmission device; 60, display screen; 70, controller; 80, data transmission unit; 90, display screen; 100, mounting circuit boards; 110, action button.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
As a first aspect of the present invention, a kind of arm support safe method for early warning is provided, comprising: the stress of jib pre-position under the Real-time Obtaining job state; The rate of change of calculated stress, if when rate of change surpasses preset range, early warning.Preferably, the stress sensitive zone of precalculated position index arm frame.Especially, by said method, can be in the process of jib actual job (for example, carrying out the operations such as pumping), detect in real time the STRESS VARIATION situation of jib in operation process, thereby carry out in time early warning according to the STRESS VARIATION situation, avoid the accident of jib fracture.
Especially, please refer to Fig. 1 and Fig. 2, this stress sensitive zone can refer to the stressed larger zone on jib.Further, in the left and right sides of the same cross section I of jib, arrange respectively one for obtaining the stress acquiring unit of this stress, can obtain so the not stress situation of homonymy of cross section.Especially, can go out stressed larger zone on jib (for example, can strain detection testing device be installed in this zone) by FEM (finite element) calculation, its selection principle during for attitude commonly used stress than large, stress gradient is little, position on other equipment without impact.
Fig. 3 shows the stress situation map of an arm joint in a certain jib.Be provided with respectively two stress acquiring units on two cross sections of this arm joint, wherein, A and B are two stress curves that the stress acquiring unit obtains that are arranged on a section, and C and D are two stress curves that the stress acquiring unit obtains that are arranged on another section.In Fig. 3, transverse axis is the sampling period, the size that the longitudinal axis is stress (Nm).Especially, can test out the stress value of operating mode commonly used and some attitudes commonly used and make curve map by research technique, form the electronic data data.In addition, the stress curve data of receiving (being the state that pump truck can on the way travel) after arm must to be arranged.
Please refer to Fig. 3, when jib starts cracking, in same operating mode, stress value there will be the angle (with reference to the curve in the zone shown in E in figure 3) of inclination downward or upward, if crackle is larger, this angle will be larger so.The present invention detects the rate of change of stress in real time; when the rate of change of stress surpasses preset range; show that the larger angle tilted has up or down appearred in stress value, therefore, also shows crackle may occur; now; early warning can occur, and to remind operating personnel to make in time remedial measures, to reduce loss, can effectively prevent the accident of jib fracture; improve the security of system, protected personal safety.
Preferably, rate of change comprises total rate of change, and total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that obtain in this certain working time, and when total rate of change surpasses the first predetermined value, early warning.
Preferably, rate of change also comprises rate of change at times, and a certain working time is divided into a plurality of continuous time periods, and rate of change refers to the slope of the fitting a straight line of all stress that obtain in each time period at times, when rate of change at times surpasses the second predetermined value, early warning.Like this, within any one period, the rate of change of stress surpasses preset range, all can send early warning.Especially, no matter total rate of change, any in rate of change or two have surpassed precalculated position at times, all can send early warning.
Preferably, the arm support safe method for early warning also comprises: when entering new operating mode, the irregular noise of filtering, then start to calculate rate of change.In real work, engineering machinery, for example pump truck is in the situation that different operating modes and different pump concrete amounts can cause the stress state of jib to alter a great deal.For this reason, stress data filtering that the present invention for example will enter new operating mode a period of time, in (5 minutes or 10 minutes), the irregular stress value to occur in filtering during this period of time, that is to say, the stress value occurred during this period of time can be thought invalid data.For example, in Fig. 3, the part of a large amount of burrs appears in the initial segment of four curves, will be by filtering.
Above-mentioned method relates in operation process, automatically detects jib STRESS VARIATION situation, to carry out early warning.When at non-job state, operating personnel need active to detect the stress state calibration property early warning of jib, now can obtain the calibration stress of jib when predetermined attitude under non-job state; Obtain pre-stored, corresponding with predetermined attitude standard stress; Comparison calibration stress and standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.Preferably, predetermined attitude comprises receipts arm state or extended configuration.
For example, can be by the method for test, the stress value when a certain normal condition (for example, while dispatching from the factory) records under normal condition that jib is in a certain attitude, and this stress value is stored as standard stress.After using a period of time, if needing initiatively jib to be given birth to early warning, operating personnel detect, can make it in corresponding attitude the operation jib, then record the stress value in this attitude, and this stress value is become and makes calibration stress.Then, the deviation between comparison calibration stress and standard stress, if this deviation surpasses the scope of the 3rd predetermined value, mean that jib, with respect to this certain normal condition state, certain crackle has occurred, so send corresponding early warning so.Otherwise, show that jib does not have greatly changed with respect to this certain normal condition state, also can normally use.
The monitoring of the present invention by the stress state to jib judges whether safety of jib.At first, can calculate by experiment the installation site of stress sensing unit with CAE, the stress sensing unit closely is arranged on jib, so that the true stress value of jib test point is effectively tested.Secondly, measure the stress of test position by the stress sensing unit after, calculate corresponding stress value.The 3rd, control module counter stress state is monitored in real time, when stress value occurs when abnormal, and corresponding alarm unit give the alarm (for example early-warning lamp can glimmer, and the early warning loudspeaker can send alarm sound etc.).When the rate of change of arm stress value surpasses preset range, will carry out early warning.Therefore, greatly improve the security performance of equipment, substantially stopped the phenomenon of the disconnected arm of jib appearance, protected personal safety.Use the present invention, can find in time potential safety hazard, particularly, can when initial crack appears in jib, make remedial measures, thereby reduce loss, saved cost.
As a second aspect of the present invention, (for example provide a kind of arm support safe prior-warning device, can be for pump truck, cranes etc. have the engineering equipment of jib), comprise: stress sensing unit 10, stress for jib pre-position under the Real-time Obtaining job state, now, must reserve the installation site of stress sensing unit on jib, especially, add man-hour at jib, reserve installation site, this installation site can adopt concave type or convex type, the preferential convex type that adopts, for example protrusion height is approximately 0.2mm, for example, protrude shape and can be rectangle, size gets final product slightly greatly than arm support safe prior-warning device, concrete scheme of installation as shown in Figure 4, control module 30, be connected with the stress sensing unit, sends early warning signal for the rate of change of calculated stress and when rate of change surpasses preset range.
Preferably, the stress sensitive zone of precalculated position index arm frame.For example, the stress sensing unit can be foil gauge.Especially, the stress sensitive zone can test by experiment or cae analysis calculates, and is mainly jib and generally gets the zone that stress value is larger.For example, control module can be PLC or single-chip microcomputer etc.For example, can calculate 10 installation site, stress sensing unit by CAE, stress sensing unit 10 need to be arranged on jib closely, has made the true stress value of jib test point effectively be tested.After recording strain, by control module 30, change into stress value.Further, control module 30 counter stress states are monitored in real time, when can be reported to the police by alarm unit when abnormal appears in stress value.
The requirement that stress sensing unit 10 need to meet is easy for installation, the precision stability time is long, and can be dynamic, continue measure stress value.During installation, need to polish smooth installed surface, remove the impurity such as degreasing, then closely, firmly paste at the jib installed position.
Please refer to Fig. 5, in one embodiment, the arm support safe prior-warning device also comprises installing plate 20, control module 30 is arranged on installing plate 20(and is generally circuit board) on, control module 30 is as data processing unit, and it can process the stress that stress sensing unit 10 measures, forming curves; The data that also can obtain test are stored, and the contrast of realization and test data.When meeting judgment criteria, control module 30 contrasts automatically according to curve and test figure curve.Preferably, go back installation data transmitting device 50 on installing plate 20, it sends for the data by control module 30.The arm support safe prior-warning device can be installed on jib by installing plate 20.
Preferably, rate of change comprises total rate of change, and total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that this certain working time internal stress sensing unit obtains, when total rate of change surpasses the first predetermined value, control module generates early warning signal.
Preferably, rate of change also comprises rate of change at times, the a certain working time is divided into a plurality of continuous time periods, rate of change refers to the slope of the fitting a straight line of all stress that each time period internal stress sensing unit obtains at times, when rate of change at times surpasses the second predetermined value, control module generates early warning signal.
Preferably, the arm support safe prior-warning device also comprises: filter unit is electrically connected to control module, for the irregular noise of filtering when entering new operating mode.Preferably, after the stress signal obtained is stable, control module starts to calculate above-mentioned rate of change again.
Preferably, the arm support safe prior-warning device also comprises: alarm unit 40, with control module, be electrically connected to, and early warning signal trigger alarm cell operation, to give the alarm.Alarm unit 40 comprises alarm lamp, alarming horn etc., realizes sound and vision double warning.
Preferably, the arm support safe prior-warning device also comprises: display screen 60 is electrically connected to control module, for the display alarm information.
Preferably, control module 30 obtains calibration stress and pre-stored, with the predetermined attitude corresponding standard stress of jib when predetermined attitude under non-job state, and comparison calibration stress and standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.Like this, the present invention has double early warning system, and wherein, first is heavily the early warning of jib when non-job state, and second is heavily the early warning of jib when job state, thereby, improved early warning reliable, have the advantages that safety coefficient is high.
As a third aspect of the present invention, a kind of arm support safe early warning system is provided, comprising: above-mentioned arm support safe prior-warning device; Tractor driver's controller, be connected with the communication of arm support safe prior-warning device, for reporting to the police and driver operation.For example, between tractor driver's controller and arm support safe prior-warning device, can adopt wired and/or wireless mode, preferably use wireless mode.
Please refer to Fig. 6, preferably, tractor driver's controller comprises: data transmission unit 80, for receiving the data that transmitted by data transmission device 50; Controller 70, be electrically connected to the data that receive for the treatment of data transmission unit 80 with data transmission unit 80; Display screen 90, be electrically connected to controller 70, for showing early warning information; Action button 110, be electrically connected to controller 70, for to control module 30, sending control information.Further, data transmission unit 80, controller 70, display screen 90 and action button 110 are arranged on mounting circuit boards 100.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (14)
1. an arm support safe method for early warning, is characterized in that, comprising:
The stress of jib pre-position under the Real-time Obtaining job state;
Calculate the rate of change of described stress, if when described rate of change surpasses preset range, early warning.
2. arm support safe method for early warning according to claim 1, is characterized in that, described precalculated position refers to the stress sensitive zone of described jib.
3. arm support safe method for early warning according to claim 1, it is characterized in that, described rate of change comprises total rate of change, described total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that obtain in this certain working time, when described total rate of change surpasses the first predetermined value, early warning.
4. arm support safe method for early warning according to claim 3, it is characterized in that, described rate of change also comprises rate of change at times, the described a certain working time is divided into a plurality of continuous time periods, described rate of change at times refers to the slope of the fitting a straight line of all stress that obtain in each described time period, when described rate of change at times surpasses the second predetermined value, early warning.
5. arm support safe method for early warning according to claim 3, is characterized in that, described arm support safe method for early warning also comprises:
When entering new operating mode, the irregular noise of filtering, then start to calculate described rate of change.
6. arm support safe method for early warning according to claim 1, is characterized in that, described arm support safe method for early warning also comprises:
Obtain the calibration stress of described jib when predetermined attitude under non-job state;
Obtain pre-stored, corresponding with described predetermined attitude standard stress;
More described calibration stress and described standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.
7. arm support safe method for early warning according to claim 6, is characterized in that, described predetermined attitude comprises receives arm state or extended configuration.
8. an arm support safe prior-warning device, is characterized in that, comprising:
The stress sensing unit, for the stress of jib pre-position under the Real-time Obtaining job state;
Control module, be connected with described stress sensing unit, sends early warning signal for the rate of change that calculates described stress and when described rate of change surpasses preset range.
9. arm support safe prior-warning device according to claim 8, is characterized in that, described precalculated position refers to the stress sensitive zone of described jib.
10. arm support safe prior-warning device according to claim 8, it is characterized in that, described rate of change comprises total rate of change, described total rate of change is within a certain working time, the slope of the fitting a straight line of all stress that in this certain working time, described stress sensing unit obtains, when described total rate of change surpasses the first predetermined value, described control module generates early warning signal.
11. arm support safe prior-warning device according to claim 10, it is characterized in that, described rate of change also comprises rate of change at times, the described a certain working time is divided into a plurality of continuous time periods, described rate of change at times refers to the slope of the fitting a straight line of all stress that in each described time period, described stress sensing unit obtains, when described rate of change at times surpasses the second predetermined value, described control module generates early warning signal.
12. arm support safe prior-warning device according to claim 10, is characterized in that, described arm support safe prior-warning device also comprises:
Filter unit, be electrically connected to described control module, for the irregular noise of filtering when entering new operating mode.
13. arm support safe prior-warning device according to claim 8, it is characterized in that, described control module obtains calibration stress and pre-stored, with the described predetermined attitude corresponding standard stress of described jib when predetermined attitude under non-job state, and more described calibration stress and described standard stress, if the deviation of the two surpasses the 3rd predetermined value, early warning.
14. an arm support safe early warning system, is characterized in that, comprising:
The arm support safe prior-warning device, described arm support safe prior-warning device is the described arm support safe prior-warning device of any one in claim 8 to 13;
Tractor driver's controller, be connected with the communication of described arm support safe prior-warning device, for reporting to the police and driver operation.
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Cited By (7)
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| CN103879881A (en) * | 2014-03-10 | 2014-06-25 | 中联重科股份有限公司 | Crane hook safe operation control method, device and system and crane |
| CN104502009A (en) * | 2014-11-28 | 2015-04-08 | 湖南三一智能控制设备有限公司 | Boom anti-collision device, boom anti-collision method and engineering machinery |
| CN104330272B (en) * | 2014-10-23 | 2017-06-30 | 长沙中联消防机械有限公司 | Method, device and system for monitoring fatigue strength of boom structure and fire truck |
| CN106969732A (en) * | 2016-01-13 | 2017-07-21 | 中联重科股份有限公司 | Method, device and system for detecting arm support cracking and engineering machinery |
| CN107687912A (en) * | 2017-08-19 | 2018-02-13 | 许东强 | A kind of stress mornitoring method and the operating platform with this method |
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| CN113565720A (en) * | 2021-07-21 | 2021-10-29 | 中联重科股份有限公司 | Method, processor, device and pump truck for determining pumping volume |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103879881A (en) * | 2014-03-10 | 2014-06-25 | 中联重科股份有限公司 | Crane hook safe operation control method, device and system and crane |
| CN103879881B (en) * | 2014-03-10 | 2016-05-11 | 中联重科股份有限公司 | Crane hook safe operation control method, device and system and crane |
| CN104330272B (en) * | 2014-10-23 | 2017-06-30 | 长沙中联消防机械有限公司 | Method, device and system for monitoring fatigue strength of boom structure and fire truck |
| CN104502009A (en) * | 2014-11-28 | 2015-04-08 | 湖南三一智能控制设备有限公司 | Boom anti-collision device, boom anti-collision method and engineering machinery |
| CN106969732A (en) * | 2016-01-13 | 2017-07-21 | 中联重科股份有限公司 | Method, device and system for detecting arm support cracking and engineering machinery |
| CN107687912A (en) * | 2017-08-19 | 2018-02-13 | 许东强 | A kind of stress mornitoring method and the operating platform with this method |
| CN107687912B (en) * | 2017-08-19 | 2019-08-02 | 许东强 | A kind of stress mornitoring method and the operating platform with this method |
| CN113565720A (en) * | 2021-07-21 | 2021-10-29 | 中联重科股份有限公司 | Method, processor, device and pump truck for determining pumping volume |
| CN113456482A (en) * | 2021-08-18 | 2021-10-01 | 湖南馨创科技开发有限公司 | Adjustable multifunctional artificial intelligence lying bed for moxibustion and control thereof |
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