CN214456307U - Early warning device for fatigue damage of steel crane beam - Google Patents
Early warning device for fatigue damage of steel crane beam Download PDFInfo
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- CN214456307U CN214456307U CN202023122655.6U CN202023122655U CN214456307U CN 214456307 U CN214456307 U CN 214456307U CN 202023122655 U CN202023122655 U CN 202023122655U CN 214456307 U CN214456307 U CN 214456307U
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Abstract
The utility model provides a steel crane roof beam fatigue failure's early warning device. This early warning device includes: the steel plate, the fixing piece and the crack monitoring equipment; the steel plate is used for being fixed at a preset position of a lower flange of the crane beam to be detected through the fixing piece; the steel plate is provided with a round hole with a second size and a fatigue crack with a third size; the crack monitoring equipment is used for monitoring the fatigue cracks on the steel plate in real time and sending alarm information when the length of the fatigue cracks on the steel plate is larger than or equal to a preset length threshold value. Use the utility model discloses can take place fatigue failure to the crane beam and carry out early warning in advance.
Description
Technical Field
The application relates to the technical field of steel structure fatigue, in particular to a steel crane beam fatigue failure early warning device.
Background
At present, the crane beam system is widely applied to various industries, serves the production line and is the 'life line' of industrial production. The number of the crane beam systems which are put into use is huge, and the number of the crane beam systems in service in the domestic steel industry can reach 30 ten thousand.
In the practical application process, under the action of the reciprocating load of the crane, the fatigue failure of the crane beam structure often occurs. According to statistics, more than 90% of the fatigue damage of the industrial building steel structure occurs in a crane beam system of a heavy-duty working system and an influence area thereof; more than 80% of heavy-duty steel-making crane beam systems in China will have fatigue cracking or even breakage after being used for 10-15 years, and most of the systems are smaller than the designed service life. The fatigue failure of the crane beam belongs to brittle failure, and has the property of burst, generally the failure without early warning; meanwhile, the method has universality and is a high-incidence group for the fatigue failure of the industrial building steel structure. Once the crane beam is damaged, serious safety production accidents, personnel injury and production halt can be caused, and huge economic loss is caused. However, in the prior art, fatigue cracks of the crane beam are difficult to find in the early period, and safety management of the crane beam is a passive mode, so that an early warning device is urgently needed to early warn fatigue damage of the crane beam, so that the management mode of the crane beam is from passive traction to active control, and accidents are prevented.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a steel crane roof beam fatigue destruction's early warning device to can take place fatigue destruction to the crane roof beam and carry out early warning in advance.
The technical scheme of the utility model specifically be so realized:
the utility model provides a steel crane roof beam fatigue destruction early warning device, this early warning device includes: the steel plate, the fixing piece and the crack monitoring equipment;
the steel plate is used for being fixed at a preset position of a lower flange of the crane beam to be detected through the fixing piece; the steel plate is provided with a round hole with a second size and a fatigue crack with a third size;
the crack monitoring equipment is used for monitoring the fatigue cracks on the steel plate in real time and sending alarm information when the length of the fatigue cracks on the steel plate is larger than or equal to a preset length threshold value.
Preferably, the fixing member is a clamp or a bolt.
Preferably, the preset position of the lower flange of the crane beam is the span of the lower flange of the crane beam.
Preferably, the crack monitoring device is an image acquisition device.
Preferably, the crack monitoring device comprises:
one or more fracture displacement sensors;
the crack displacement sensors are respectively arranged at preset positions and used for determining the fatigue crack condition of the positions where the crack displacement sensors are located.
Preferably, the one or more crack displacement sensors are arranged at different positions in the extension direction of the fatigue crack.
Preferably, the first dimension is: the length is 500mm, the width is 200mm, and the thickness is 8mm.
Preferably, the second dimension is: the diameter is 5 mm.
Preferably, the third dimension is: the length is 1 mm.
Preferably, the fourth dimension is: the length is 10mm and the width is 1 mm.
As above it can be seen, in the utility model provides an among the early warning device of steel crane beam fatigue destruction, owing to set up the round hole that has the second size and the fatigue crack that has the third size on the steel sheet to fix this steel sheet at the preset position on the bottom flange of crane beam, and pass through crack monitoring equipment is right fatigue crack on the steel sheet carries out real-time supervision, and works as when the length of the fatigue crack on the steel sheet is greater than or equal to predetermined length threshold value, sends alarm information, therefore can probably produce fatigue crack in the crane beam, in time sends corresponding alarm information, in order to remind relevant staff, thereby take place fatigue destruction to the crane beam and carry out early warning in advance, prevent that the crane beam from appearing fatigue destruction suddenly, therefore can control the safety of steel crane beam effectively, prevent the emergence of accident.
Drawings
Fig. 1 is the embodiment of the utility model provides an in the embodiment of the early warning device of steel crane beam fatigue destruction's structural schematic.
Fig. 2 is a sectional view a-a of fig. 1.
Fig. 3 is a sectional view B-B of fig. 1.
Fig. 4 is the embodiment of the utility model provides an installation schematic diagram of early warning device of steel crane roof beam fatigue destruction.
Fig. 5 is a schematic view of a steel plate in an embodiment of the present invention.
Detailed Description
In order to make the technical solution and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the embodiment of the utility model provides an in the embodiment of the utility model discloses steel crane beam fatigue destruction's early warning device's schematic structure. Fig. 2 is a sectional view a-a of fig. 1. Fig. 3 is a sectional view B-B of fig. 1. Fig. 4 is the embodiment of the utility model provides an installation schematic diagram of early warning device of steel crane roof beam fatigue destruction. Fig. 5 is a schematic view of a steel plate in an embodiment of the present invention.
As shown in fig. 1 to 5, the early warning device for fatigue failure of a steel crane beam comprises: a steel plate 21, a fixing member 22 and a crack monitoring device 23;
the steel plate is used for being fixed at a preset position of a lower flange of the crane beam 20 to be measured through the fixing piece; the steel plate is provided with a round hole 24 with a second size and a fatigue crack 25 with a third size;
the crack monitoring equipment is used for monitoring the fatigue cracks on the steel plate in real time and sending alarm information when the length of the fatigue cracks on the steel plate is larger than or equal to a preset length threshold value.
In addition, as an example, in a preferred embodiment of the present invention, the fixing member is a clamp or a bolt.
According to the structure of the early warning device for the fatigue damage of the steel crane beam, the round hole and the corresponding fatigue crack are formed in the steel plate in advance, the steel plate is fixed at the preset position of the lower flange of the crane beam, and the steel plate and the crane beam body are stressed simultaneously, so that the fatigue crack on the steel plate continues to expand under the action of the circulating load of a crane. Further, the propagation length of the fatigue crack has a correlation with the number of stress cycles, and thus the number of stress cycles to which the crane beam is subjected can be reflected. When the fatigue crack is expanded to a certain length, the risk of fatigue damage of the crane beam is predicted, alarm information can be sent out at the moment, early warning is carried out on the fatigue damage of the crane beam, then fatigue performance evaluation can be carried out on the crane beam in the subsequent process, so that the fatigue damage of the crane beam is avoided suddenly, the safety of the steel crane beam can be effectively controlled, and accidents are prevented.
In addition, in a specific embodiment of the present invention, a circular hole having a second size and a fatigue crack having a third size may be formed on a steel plate having a first size first.
For example, a round hole having a second size may be formed on a previously prepared steel plate having a first size.
For example, in a preferred embodiment of the present invention, a steel plate is prepared, and then holes are formed in the steel plate by using laser, so as to form the required circular holes.
Additionally, be in the technical scheme of the utility model, can set up the value of above-mentioned first size and second size in advance according to the needs of the practical application condition.
For example, in a preferred embodiment of the present invention, the first dimension is: a length of 500 millimeters (mm), a width of 200mm, and a thickness of 8 mm; the second dimension is: the diameter is 5 mm. Of course, in practical applications, the first size and the second size may also be other suitable values, and are not described herein again.
Then, a fine grain with a fourth size is formed on each of two sides of the round hole.
After the round hole is formed, a fine grain is formed on each of two sides of the round hole, so that a required fatigue crack is formed at the fine grain in the subsequent fatigue loading test process, and the purpose of generating a corresponding fatigue crack at a preset position is achieved.
For example, in a preferred embodiment of the present invention, a fine line with a fourth size may be cut on both sides of the circular hole, as shown in fig. 5.
Additionally, be in the technical scheme of the utility model, can set up the value of above-mentioned fourth size in advance according to the needs of the practical application condition.
For example, in a preferred embodiment of the present invention, the fourth dimension is: the length is 10 millimeters (mm) and the width is 1 millimeter (mm). Of course, in practical applications, the fourth dimension may also be another suitable value, and is not described herein again.
In addition, as an example, in a preferred embodiment of the present invention, the extending direction of the fine lines may be perpendicular to the length direction of the steel plate, so that the extending direction of the generated fatigue cracks may be perpendicular to the direction of the stress applied to the steel plate in the subsequent process.
Subsequently, the steel plate may be subjected to a fatigue loading test using a fatigue testing machine until a fatigue crack having a third size occurs at the tail of the fine grain on the steel plate, and the fatigue loading test is stopped.
For example, the steel sheet may be mounted on a fatigue tester and subjected to a fatigue loading test by the fatigue tester. Since two sides of the round hole are respectively provided with one fine grain, after the fatigue loading test is carried out for a period of time, fatigue cracks are respectively generated at the tail parts of the two fine grains. Therefore, when the fatigue crack generated at the tail of the fine grain has a preset third size, the fatigue loading test is stopped, and a steel plate having the fatigue crack is formed.
Additionally, be in the technical scheme of the utility model, can set up the value of above-mentioned third size in advance according to the needs of the practical application condition.
For example, in a preferred embodiment of the present invention, the third dimension is: the length is 1 millimeter (mm). Of course, in practical applications, the third dimension may also be another suitable value, so as to facilitate observation and/or detection of the fatigue crack in a subsequent process, which is not described herein again.
As described above, it is understood that the circular hole and the fatigue crack having the predetermined size can be formed in the previously prepared steel sheet.
After the circular hole with the preset size and the fatigue crack are formed on the preset steel plate, the steel plate can be fixed at the preset position of the lower flange of the crane beam.
The technical scheme of the utility model, can be according to the needs of the practical application condition, the concrete position of position is predetermine to the preset-mentioned.
For example, in a preferred embodiment of the present invention, the preset positions are: the lower flange of the crane beam spans the center as shown in fig. 4. Since the stress level in the lower flange span of the crane beam is generally the highest and is the most likely potential location for fatigue cracks, the steel plate can be fixed in the lower flange span of the crane beam.
In addition, in the technical scheme of the utility model, can use multiple implementation method to fix foretell steel sheet. The technical solution of the present invention will be described in detail below by taking one of the specific implementation modes as an example.
For example, in a preferred embodiment of the present invention, the steel plate may be fixed to the lower flange of the crane beam at a predetermined position using a jig or a bolt. Of course, other suitable ways to fix the steel plate may be used, and are not described in detail herein.
In addition, in order to ensure that the steel plate can cooperate with the crane beam on which the steel plate is arranged, a preset longitudinal pretension force can be applied to the steel plate when the steel plate is fixed.
Additionally, be in the technical scheme of the utility model, can set up the value of above-mentioned vertical pretension according to the needs of the practical application condition (for example, the crane beam atress condition of actual engineering) in advance, no longer describe herein.
In addition, after the steel plate is installed, corresponding crack monitoring equipment can be arranged, so that the fatigue cracks on the steel plate can be monitored in real time through the crack monitoring equipment.
Additionally, among the technical scheme of the utility model, can use multiple monitoring facilities to realize right fatigue crack on the steel sheet carries out real-time supervision.
For example, in a preferred embodiment of the present invention, the crack monitoring device may be an image capture device (e.g., a camera, a video camera, etc.). The image acquisition device can acquire the image information of the fatigue crack on the steel plate in time, and can acquire the relevant information of the fatigue crack (such as the length information of the fatigue crack) according to the acquired image information.
In addition, as an example, in a preferred embodiment of the present invention, the crack monitoring device may be directly disposed on the steel plate, or may not be directly disposed on the steel plate, but disposed on another object that is kept relatively still with respect to the steel plate.
For another example, in a preferred embodiment of the present invention, the crack monitoring device may include: one or more fracture displacement sensors; the crack displacement sensors are respectively arranged at preset positions and used for determining the fatigue crack condition of the positions where the crack displacement sensors are located.
For example, one or more crack displacement sensors may be provided in advance at different positions in the extending direction of the fatigue crack. And for each crack displacement sensor, the fatigue crack condition of the position of the crack displacement sensor can be determined by detecting the voltage change between two reference points of the position of the crack displacement sensor. For example, when a crack displacement sensor at a certain position detects a fatigue crack, it can be known that the fatigue crack has already extended to the position where the crack displacement sensor is located, so that the extension condition of the fatigue crack can be acquired in real time.
Since the crack monitoring equipment is used for monitoring the fatigue cracks on the steel plate in real time, when the crack monitoring equipment monitors that the length of the fatigue cracks on the steel plate begins to increase and the length of the fatigue cracks is greater than or equal to a preset length threshold value, it is indicated that corresponding fatigue cracks may be generated in the crane beam where the steel plate is located, and therefore fatigue failure may occur. Therefore, corresponding alarm information can be sent at the moment to remind relevant workers, and therefore early warning is carried out on fatigue damage of the crane beam in advance.
Additionally, be in the technical scheme of the utility model, can set up the value of above-mentioned length threshold value in advance according to the needs of the actual application condition (for example, the fatigue crack speed that specific structure, crane tonnage, production frequency and pass through fatigue loading test of engineering crane roof beam confirm etc.), consequently no longer describe herein.
As can be seen from the above, after the steel plate having the fatigue cracks is mounted on the bottom flange of the crane beam, the steel plate is subjected to a force simultaneously with the crane beam body, and therefore, the fatigue cracks in the steel plate continue to propagate under the cyclic load of the crane. Further, the propagation length of the fatigue crack has a correlation with the number of stress cycles, and thus the number of stress cycles to which the crane beam is subjected can be reflected. When the fatigue crack is expanded to a certain length, the risk of fatigue damage of the crane beam is predicted, alarm information can be sent out at the moment, early warning is carried out on the fatigue damage of the crane beam, then fatigue performance evaluation can be carried out on the crane beam in the subsequent process, so that the fatigue damage of the crane beam is avoided suddenly, the safety of the steel crane beam can be effectively controlled, and accidents are prevented.
To sum up, the utility model discloses an among the technical scheme, owing to form round hole and corresponding fatigue crack on the steel sheet in advance to fix this steel sheet in the preset position on the bottom flange of crane beam, and pass through crack monitoring facilities is right fatigue crack on the steel sheet carries out real-time supervision, and works as when the length of the fatigue crack on the steel sheet is greater than or equal to predetermined length threshold value, sends alarm information, therefore can in the crane beam probably produce fatigue crack in, in time send corresponding alarm information, in order to remind relevant staff, thereby take place fatigue failure to the crane beam and carry out early warning in advance, prevent that the crane beam from appearing fatigue failure suddenly, therefore can control the safety of steel crane beam effectively, prevent the emergence of accident.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a steel crane roof beam fatigue destruction's early warning device which characterized in that, this early warning device includes: the steel plate, the fixing piece and the crack monitoring equipment;
the steel plate is used for being fixed at a preset position of a lower flange of the crane beam to be detected through the fixing piece; the steel plate is provided with a round hole with a second size and a fatigue crack with a third size;
the crack monitoring equipment is used for monitoring the fatigue cracks on the steel plate in real time and sending alarm information when the length of the fatigue cracks on the steel plate is larger than or equal to a preset length threshold value.
2. The warning device of claim 1,
the fixing piece is a clamp or a bolt.
3. The warning device of claim 1, wherein:
the preset position of the lower flange of the crane beam is the span of the lower flange of the crane beam.
4. The warning device of claim 1, wherein:
the crack monitoring equipment is an image acquisition device.
5. The warning device of claim 1, wherein the crack monitoring apparatus comprises:
one or more fracture displacement sensors;
the crack displacement sensors are respectively arranged at preset positions and used for determining the fatigue crack condition of the positions where the crack displacement sensors are located.
6. The warning device of claim 5, wherein:
the one or more crack displacement sensors are arranged at different positions in the extension direction of the fatigue crack.
7. The warning device of claim 1, wherein:
the second dimension is: the diameter is 5 mm.
8. The warning device of claim 1, wherein:
the third dimension is: the length is 1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023122655.6U CN214456307U (en) | 2020-12-22 | 2020-12-22 | Early warning device for fatigue damage of steel crane beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023122655.6U CN214456307U (en) | 2020-12-22 | 2020-12-22 | Early warning device for fatigue damage of steel crane beam |
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| Publication Number | Publication Date |
|---|---|
| CN214456307U true CN214456307U (en) | 2021-10-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023122655.6U Active CN214456307U (en) | 2020-12-22 | 2020-12-22 | Early warning device for fatigue damage of steel crane beam |
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| CN (1) | CN214456307U (en) |
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- 2020-12-22 CN CN202023122655.6U patent/CN214456307U/en active Active
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