CN105438985A - Metal structure fatigue detecting system and method for off-shored crane - Google Patents
Metal structure fatigue detecting system and method for off-shored crane Download PDFInfo
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- CN105438985A CN105438985A CN201511031901.8A CN201511031901A CN105438985A CN 105438985 A CN105438985 A CN 105438985A CN 201511031901 A CN201511031901 A CN 201511031901A CN 105438985 A CN105438985 A CN 105438985A
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- shored crane
- fatigue
- shored
- strain sensor
- stress data
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/16—Applications of indicating, registering, or weighing devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/18—Control systems or devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C15/00—Safety gear
- B66C15/06—Arrangements or use of warning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a metal surface fatigue detecting system and a metal surface fatigue detecting method for an off-shored crane. The detecting system comprises a plurality of strain sensors and a detecting computer, wherein the plurality of strain sensors are arranged at a plurality of preset positions of the off-shored crane to detect stress data of each preset position of the off-shored crane under different working conditions; the detecting computer comprises a computing device and a display device; the display device is connected to the plurality of the strain sensors to receive the stress data for generating a variation image of the stress data and judging fatigue degree according to a preset model; and the display device is connected to the computing device for displaying the variation image and the judged results of the fatigue degree. According to the scheme, the off-shored crane realizes real-time detection display of the stress data, and guarantees fatigue degree detection and fault early warning in an operation process of the off-shored crane.
Description
Technical field
The present invention relates to weight-lifting equipment field, particularly relate to off-shored crane Structural Metallic Fatigue checking system and method.
Background technology
Off-shored crane due to environment for use severe, operating mode is complicated, and working level is higher, and fatigue becomes its topmost collapse mode, and current trial technology focuses mostly in visual measuring means, does not still have better way for strength at repeated alternation inspection.
In " hoist design specification " (GB/T3811-2008), clear stipulaties is done for structural fatigue strength check: adopt stress amplitude ratio method to carry out analytical calculation to design load stress amplitude, obtain cycle of stress characteristic value, then concentrate situation grade to obtain fatigue admissable stress base value according to component stress, obtain component fatigue permissible stress value in conjunction with computing formula.But the design load that this check method adopts, is not equipment real work load, can not reflects the real-time strength at repeated alternation of in-service equipment; This check method has stronger limitation in addition, can not be applied to on-the-spot real-time inspection, be delayed round of visits, have impact on checkability, easily causes bad social influence.
Summary of the invention
The invention provides off-shored crane Structural Metallic Fatigue checking system and method, achieve the real-time calculating of off-shored crane strength at repeated alternation, solve the difficult problem that the tired in-use performance of on-the-spot off-shored crane cannot detect.
One aspect of the present invention adopts off-shored crane Structural Metallic Fatigue checking system, comprises multiple strain sensor and detection computations machine;
Multiple predeterminated positions that described multiple strain sensor is arranged at off-shored crane are to detect the stress data of each predeterminated position of off-shored crane under different operating mode;
Described detection computations machine comprises computer device and read out instrument;
Described computer device is connected to receive described stress data with described multiple strain sensor, for generating the modified-image of described stress data and judging degree of fatigue according to the model preset;
Described read out instrument is connected with computer device, for showing the judged result of described modified-image and degree of fatigue.
Wherein, described strain sensor is resistance strain sensor.
Wherein, the number of described strain sensor is 6.
Wherein, 6 described strain sensores are arranged at the girder span centre inside cover plate of off-shored crane, girder span centre balustrade deching, door leg upper inner web, end of main beam inside cover plate, door leg upper outside web and door midleg inside cover plate respectively.
Wherein, described computer device is connected by wireless network with described multiple strain sensor.
Wherein, the structure node distance at least 150mm of described strain sensor and place parts.
Adopt off-shored crane Structural Metallic Fatigue method of inspection on the other hand, for aforesaid checking system, comprising:
Off-shored crane is run under difference detects load;
Strain sensor detects the stress data of correspondence position in off-shored crane operational process, and described stress data is sent to detection computations machine;
The computer device of detection computations machine generates the modified-image of described stress data and judges degree of fatigue according to the model preset, and the read out instrument of detection computations machine shows the judged result of described modified-image and degree of fatigue.
Wherein, described detection under load in difference runs off-shored crane, is specially:
After being reset by checking system above a side door leg, lifting is different detects load; Arrive successively above girder span centre, another side door leg, above girder span centre, a side door leg.
Wherein, 30S is stopped respectively in the position of reference position and each arrival.
Wherein, described detection load comprises 0t, 7t and 7.5t.
Technical scheme provided by the invention, at multiple predeterminated positions of off-shored crane, strain sensor is set, the stress data of each predeterminated position of off-shored crane under different operating mode is detected by strain sensor, again stress data is sent to detection computations machine, generate the modified-image of stress data, and the degree of fatigue of off-shored crane is judged according to the model preset, show on the display apparatus by modified-image with the judged result of degree of fatigue, achieve the real-time detection display of data, ensure that the fatigue strength in off-shored crane operational process detects and fault pre-alarming.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the off-shored crane Structural Metallic Fatigue checking system provided in the specific embodiment of the invention;
Fig. 2 is the side schematic view of the off-shored crane provided in the specific embodiment of the invention;
Fig. 3 is the front schematic view of the gantry crane provided in the specific embodiment of the invention;
Fig. 4 is the side schematic view of the gantry crane provided in the specific embodiment of the invention;
Fig. 5 is the method flow diagram of the off-shored crane Structural Metallic Fatigue method of inspection provided in the specific embodiment of the invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Fig. 1 is the schematic diagram of the off-shored crane Structural Metallic Fatigue checking system provided in the specific embodiment of the invention.As shown in the figure, this off-shored crane Structural Metallic Fatigue checking system, comprises multiple strain sensor 10 and detection computations machine 20;
Multiple predeterminated positions that described multiple strain sensor 10 is arranged at off-shored crane are to detect the stress data of each predeterminated position of off-shored crane under different operating mode;
Described detection computations machine 20 comprises computer device 21 and read out instrument 22;
Described computer device 21 is connected to receive described stress data with described multiple strain sensor 10, for generating the modified-image of described stress data and judging degree of fatigue according to the model preset;
Described read out instrument 22 is connected with computer device 21, for showing the judged result of described modified-image and degree of fatigue.
As shown in Figure 2, off-shored crane forms by two structures are as shown in Figure 2 placed side by side the lateral plan of common off-shored crane, and two structures are identical, therefore are described based on side at this.The load-bearing of off-shored crane realizes mainly through propons 32, back axle 31, front vertical connecting rod 34, rear vertical connecting rod 33, front digonal link 36, rear digonal link 35 and assists load-bearing by other for the digonal link forming three-legged structure.Corresponding with above-mentioned load-supporting part, the crucial supporting point of each load-supporting part arranges strain sensor 10, the middle part of such as propons 32, the front end of propons 32, the middle part of back axle 31, front digonal link 36.In fig. 2, the vibrational power flow of side has 10 strain sensores 10, because symmetrical structure, altogether at least needs 20 strain sensores 10, add the auxiliary load larrying member for fixing structure on two sides helps out, the strain sensor 10 that off-shored crane needs are arranged may more than 20.
Off-shored crane also has a kind of gantry crane in addition, and specifically please refer to Fig. 3 and Fig. 4, load-bearing mainly at girder 37 and door leg 38, girder is provided with cover plate 39; For improving the accuracy and efficiency that detect, emphasis detects at the key position of off-shored crane and abrupt change of cross-section position; For off-shored crane, such position has 6, to in requisition for 6 strain sensores 10, be arranged at the girder span centre inside cover plate of off-shored crane, girder span centre balustrade deching, door leg upper inner web, end of main beam inside cover plate, door leg upper outside web and door midleg inside cover plate respectively, the concrete setting position of 6 strain sensores 10 is with reference to figure 3 and Fig. 4.
Because off-shored crane is quite tall and big, in order to reduce wiring, computer device 21 is connected by wireless network with described multiple strain sensor 10, by wireless network, stress data is sent to computer device 21 from strain sensor 10.In the loading process of metal construction, the structure node of parts, the i.e. boundary position of parts, the fluctuation of stress is large, there is comparatively big error in testing result, can not the degree of fatigue of real embodiment metal construction, so the structure node distance at least 150mm of strain sensor 10 and place parts, such as 150mm, 240mm, 300mm etc., to obtain testing result as far as possible accurately.
Strain sensor 10 is a kind of sensors being out of shape the strain produced based on measurement object receiving force.It is a kind of sensitive member that the change that mechanical component strains can be converted to resistance variations.Resistance strain gage is then the sensitive member that it the most often adopts, such as wire form resistance strain gage and foil resistance strain-gauge.Strain sensor 10 and resistance strain gage in the prior art more statement, is not described further at this.
In sum, at multiple predeterminated positions of off-shored crane, strain sensor is set, the stress data of each predeterminated position of off-shored crane under different operating mode is detected by strain sensor, again stress data is sent to detection computations machine, generate the modified-image of stress data, and the degree of fatigue of off-shored crane is judged according to the model preset, show on the display apparatus by modified-image with the judged result of degree of fatigue, achieve the real-time detection display of data, ensure that the fatigue strength in off-shored crane operational process detects and fault pre-alarming.
It is below the embodiment of the off-shored crane Structural Metallic Fatigue method of inspection provided in the specific embodiment of the invention, the embodiment of off-shored crane Structural Metallic Fatigue method of inspection realizes based on the embodiment of aforesaid off-shored crane Structural Metallic Fatigue checking system, therefore is no longer further described system results in the embodiment of off-shored crane Structural Metallic Fatigue method of inspection.
Please refer to Fig. 5, it is the method flow diagram of the employing off-shored crane Structural Metallic Fatigue method of inspection provided in the specific embodiment of the invention, and as shown in the figure, the method, comprising:
Step S101: run off-shored crane under difference detects load.
Step S102: strain sensor detects the stress data of correspondence position in off-shored crane operational process, and described stress data is sent to detection computations machine;
Step S103: the computer device of detection computations machine generates the modified-image of described stress data and judges degree of fatigue according to the model preset, and the read out instrument of detection computations machine shows the judged result of described modified-image and degree of fatigue.
Below in conjunction with concrete data, actual testing process is described.
In the whole detection process of previously described two kinds of hoisting cranes, just the two working conditions change and check point may difference to some extent, are specifically described in detail for gantry crane at this.
In this programme, the equipment metallic material of selecting is the off-shored crane of Q235, and key position and abrupt change of cross-section position in off-shored crane metal construction are chosen in test, and totally 6 place's measuring points are specifically as shown in table 1.
Table 1
In actual test process, test by the operating mode shown in table 2.
Table 2
Carry out initial decision to 6 measuring point datas, measuring point stress response results under each operating condition is as follows: (note: response tensile stress value is just, represents or omit with "+"; Response value of compressive stress is negative, represents with "-")
Table 3 (unit: MPa)
From stress-strain test point response data each under each operating condition of test:
1) under operating condition of test III effect, girder span centre inside cover plate stress is maximum, and maxim is-52.32MPa.
2) under all operating condition of test, stress suffered by door leg top is symmetrical, but correlative value is comparatively large, is vibration larger portion position, should pays close attention to.
3) under all operating condition of test, inside and outside girder span centre cover plate, lateral stress all shows as stronger symmetry.But inside cover plate there is damage in span centre, and there is stress and suddenly increase phenomenon, wheel is through span centre, and suffered stress increases about 16MPa.
For the stress data under each operating mode that 6 measuring point datas are corresponding, can draw the diagram of curves of time and stress, counter stress data describe more intuitively and judge.According in GB/T3811-2008 to the description of vibrative mechanism load condition, this time test is under no-wind environment, and do not consider that wind carries, strength margin n should get 1.48, and now, the permissible stress of material is:
wherein, σ
srefer to the yield value of metallic material.When not considering hardware weight stress, girder span centre inside cover plate stress is 52.32MPa, within the scope of security clearance.
Known by complete machine metal construction stress-strain test result: inside and outside girder span centre cover plate, lateral stress value is all comparatively large, is pay close attention to a little; Under all operating condition of test, inside and outside door leg top two coxostermum measuring point and girder span centre, two side cover plates respond and have good symmetry under operating condition of test, but girder span centre exists damage, should draw attention.In routine duties, quiet run of should trying one's best during the operating mode of carrying for lifting volume or carrying close to volume, reduces the shock response that structure is subject to, periodic inspection girder upper cover plate, door leg top and girder connecting portion.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (10)
1. off-shored crane Structural Metallic Fatigue checking system, is characterized in that, comprises multiple strain sensor and detection computations machine;
Multiple predeterminated positions that described multiple strain sensor is arranged at off-shored crane are to detect the stress data of each predeterminated position of off-shored crane under different operating mode;
Described detection computations machine comprises computer device and read out instrument;
Described computer device is connected to receive described stress data with described multiple strain sensor, for generating the modified-image of described stress data and judging degree of fatigue according to the model preset;
Described read out instrument is connected with computer device, for showing the judged result of described modified-image and degree of fatigue.
2. off-shored crane Structural Metallic Fatigue checking system according to claim 1, is characterized in that, described strain sensor is resistance strain sensor.
3. off-shored crane Structural Metallic Fatigue checking system according to claim 1, is characterized in that, the number of described strain sensor is 6.
4. off-shored crane Structural Metallic Fatigue checking system according to claim 3, it is characterized in that, 6 described strain sensores are arranged at the girder span centre inside cover plate of off-shored crane, girder span centre balustrade deching, door leg upper inner web, end of main beam inside cover plate, door leg upper outside web and door midleg inside cover plate respectively.
5. off-shored crane Structural Metallic Fatigue checking system according to claim 1, is characterized in that, described computer device is connected by wireless network with described multiple strain sensor.
6. off-shored crane Structural Metallic Fatigue checking system according to claim 1, is characterized in that, the structure node distance at least 150mm of described strain sensor and place parts.
7. off-shored crane Structural Metallic Fatigue method of inspection, for the checking system described in any one of claim 1 ~ 6, is characterized in that, comprising:
Off-shored crane is run under difference detects load;
Strain sensor detects the stress data of correspondence position in off-shored crane operational process, and described stress data is sent to detection computations machine;
The computer device of detection computations machine generates the modified-image of described stress data and judges degree of fatigue according to the model preset, and the read out instrument of detection computations machine shows the judged result of described modified-image and degree of fatigue.
8. off-shored crane Structural Metallic Fatigue method of inspection according to claim 7, is characterized in that, described detection under load in difference runs off-shored crane, is specially:
After being reset by checking system above a side door leg, lifting is different detects load; Arrive successively above girder span centre, another side door leg, above girder span centre, a side door leg.
9. off-shored crane Structural Metallic Fatigue method of inspection according to claim 8, is characterized in that, stops 30S respectively in the position of reference position and each arrival.
10. off-shored crane Structural Metallic Fatigue method of inspection according to claim 7, is characterized in that, described detection load comprises 0t, 7t and 7.5t.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106395638A (en) * | 2016-11-08 | 2017-02-15 | 芜湖市长江起重设备制造有限公司 | Bridge crane for production |
| CN106847055A (en) * | 2017-01-18 | 2017-06-13 | 山东省特种设备检验研究院泰安分院 | A kind of lifting machinery metal structure stress-strain test apparatus for demonstrating |
| CN107246970A (en) * | 2017-05-27 | 2017-10-13 | 北京新能源汽车股份有限公司 | The fault monitoring method and server of a kind of vacuum boost system |
| CN107500133A (en) * | 2017-10-20 | 2017-12-22 | 中国特种设备检测研究院 | Hoisting equipment Stress On-Line and early warning system based on optical fiber sensing network |
| CN108986438A (en) * | 2018-08-17 | 2018-12-11 | 上海海事大学 | A kind of gantry crane data wireless monitor system based on LoRa |
| CN110175417A (en) * | 2019-05-30 | 2019-08-27 | 中广核核电运营有限公司 | Monitoring method, device, computer equipment and the storage medium of enclosure stress |
| CN110925212A (en) * | 2019-12-11 | 2020-03-27 | 江西风石压缩机有限公司 | Oil-cooled compressor and control method |
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| CN102826452A (en) * | 2011-07-22 | 2012-12-19 | 广州市特种机电设备检测研究院 | Crane load spectrum data acquisition system, method thereof, and fatigue life assessment system |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106395638A (en) * | 2016-11-08 | 2017-02-15 | 芜湖市长江起重设备制造有限公司 | Bridge crane for production |
| CN106847055A (en) * | 2017-01-18 | 2017-06-13 | 山东省特种设备检验研究院泰安分院 | A kind of lifting machinery metal structure stress-strain test apparatus for demonstrating |
| CN106847055B (en) * | 2017-01-18 | 2023-01-20 | 山东省特种设备检验研究院泰安分院 | Stress-strain test demonstration device for metal structure of hoisting machinery |
| CN107246970A (en) * | 2017-05-27 | 2017-10-13 | 北京新能源汽车股份有限公司 | The fault monitoring method and server of a kind of vacuum boost system |
| CN107500133A (en) * | 2017-10-20 | 2017-12-22 | 中国特种设备检测研究院 | Hoisting equipment Stress On-Line and early warning system based on optical fiber sensing network |
| CN108986438A (en) * | 2018-08-17 | 2018-12-11 | 上海海事大学 | A kind of gantry crane data wireless monitor system based on LoRa |
| CN110175417A (en) * | 2019-05-30 | 2019-08-27 | 中广核核电运营有限公司 | Monitoring method, device, computer equipment and the storage medium of enclosure stress |
| CN110925212A (en) * | 2019-12-11 | 2020-03-27 | 江西风石压缩机有限公司 | Oil-cooled compressor and control method |
| CN110925212B (en) * | 2019-12-11 | 2022-02-18 | 江西风石压缩机有限公司 | Oil-cooled compressor and control method |
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