CN113218607A - Bolt connection structure looseness test device under eccentric load effect considering connecting piece abrasion - Google Patents
Bolt connection structure looseness test device under eccentric load effect considering connecting piece abrasion Download PDFInfo
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- CN113218607A CN113218607A CN202110488176.6A CN202110488176A CN113218607A CN 113218607 A CN113218607 A CN 113218607A CN 202110488176 A CN202110488176 A CN 202110488176A CN 113218607 A CN113218607 A CN 113218607A
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- connecting piece
- bolt
- eccentric load
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- 238000012360 testing method Methods 0.000 title claims abstract description 46
- 238000005299 abrasion Methods 0.000 title claims abstract description 21
- 230000000694 effects Effects 0.000 title claims abstract description 6
- 230000009471 action Effects 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000013016 damping Methods 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 8
- 230000008859 change Effects 0.000 abstract description 4
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/027—Specimen mounting arrangements, e.g. table head adapters
Abstract
The invention discloses a bolting structure looseness test device under the action of eccentric load considering abrasion of a connecting piece, which consists of a lower connecting piece driving module, an upper connecting piece fixing module, a height adjusting device and a two-dimensional force sensor module. The lower connecting piece driving module comprises a loading module and a lower connecting piece, and the power of the motor is converted into eccentric load required by a bolt connection structure loosening test. The upper connecting piece fixing module comprises an upper connecting piece, a connecting bracket and a damping device. In the test process, the lower connecting piece vibrates along with the loading module, the upper connecting piece is fixed on the connecting support, and the annular pre-tightening force sensor arranged at the head of the tested bolt measures the change of the pre-tightening force of the bolting structure. This device can accomplish the experimental research of bolt structure looseness under the eccentric load effect of considering connecting piece wearing and tearing, and can become flexible under different eccentric distance, different load frequency, different load amplitude experimental, and the structure is small and exquisite, easy operation and possess higher safety.
Description
Technical Field
The invention relates to a bolt structure looseness test device under the action of eccentric load considering abrasion of a connecting piece, and belongs to the field of bolt vibration test.
Background
The bolt connection structure is simple, reliable in connection and convenient to assemble and disassemble, and is widely applied to various assembly bodies. However, in engineering practice, the load borne by the bolt is usually asymmetric or eccentric, and the bolt can be loosened when the bolt is subjected to vibration load, so that equipment is seriously damaged, and even accidents occur. The existing bolt looseness research device is based on a large-scale tensile testing machine, the needed auxiliary equipment is more and is easy to cause danger, most of the existing bolt looseness research is that the bolt bears the axial or transverse load effect, and few researches consider the looseness test device under the eccentric load effect of the bolt.
In order to research the influence of eccentric load on bolt looseness and easily carry out experimental research by using small equipment, a bolt connection structure looseness test device under the action of the eccentric load considering the abrasion of a connecting piece is designed.
Disclosure of Invention
The invention aims to solve the technical problem that small equipment cannot be used for carrying out loosening research on a bolting structure under the action of eccentric load considering abrasion of a connecting piece, and provides a bolting structure loosening test device under the action of the eccentric load considering abrasion of the connecting piece, which can change the eccentric distance, is light, small and exquisite and is simple to operate.
The technical scheme adopted by the invention for solving the technical problems is as follows: a bolt connection structure looseness test device under the action of eccentric load considering abrasion of a connecting piece mainly comprises a lower connecting piece driving module, an upper connecting piece fixing module, a height adjusting device and a two-dimensional force sensor module. The lower connecting piece driving module converts the power of the motor into eccentric load required by a bolt connection structure loosening test, and the upper connecting piece is fixed on the connecting support through a screw. In the test process, the lower connecting piece 2 vibrates along with the loading module 1, the upper connecting piece 4 is fixed on the connecting support 5, and the head of the tested bolt 11 is provided with the annular pretightening force sensor 9 for measuring the change of the pretightening force of the bolted structure.
The device includes: the device comprises a loading module 1, a lower connecting piece 2, a tested nut 3, an upper connecting piece 4, a connecting support 5, a damping device 6, a two-dimensional force sensor 7, a height adjusting device 8, an annular pre-tightening force sensor 9, a gasket 10 and a tested bolt 11. In the test process, the lower connecting piece 2 is connected with the loading module 1 through a screw, the lower connecting piece 2 can vibrate together with the loading module 1, and the upper connecting piece 4 is fixed on the connecting support 5.
The lower connecting piece 2 and the upper connecting piece 4 are connected with the tested nut 3 through the tested bolt 11, an annular pre-tightening force sensor 9 is installed at the head of the tested bolt 11, the annular pre-tightening force sensor 9 is connected with a data acquisition card, the pre-tightening force value of the tested bolt 11 is transmitted to a computer end through the data acquisition card, and therefore real-time monitoring of the pre-tightening force of the bolted structure can be achieved.
When the lower connecting piece 2 vibrates along with the loading module 1, the upper connecting piece 4 is fixed on the connecting bracket 5, and the load borne by the tested bolt 11 for connecting the lower connecting piece 2 and the upper connecting piece 4 is eccentric load. In the test process, firstly, a looseness test device is installed, and then software is operated at a computer end to control the loading module 1 to vibrate.
The vibration mode of the loading module 1 can be adjusted according to different test parameters, and the motion frequency range is 0 to 25HZ, and the load amplitude range is 0 to 5 KN.
The lower connecting piece 2 is replaced, the height adjusting device 8 can move up and down through the guide rail, and the position of the bolt hole of the upper connecting piece 4 is adjusted through the height adjusting device 8 at the moment, so that the bolt hole of the upper connecting piece and the bolt hole of the lower connecting piece 2 are aligned to each other through the axis, and the purpose of changing the eccentric distance can be achieved.
Because the surface of the connecting piece is abraded after the bolt loosening test, the surface appearance of the connecting piece after the loosening test is inconsistent with the actual engineering surface, the lower connecting piece 2 and the upper connecting piece 4 of the device are easy to replace, and the contact surface of the bolt connecting structure can be kept consistent with the actual engineering surface.
In the test process, the influence of the abrasion of the connecting piece and the bolt and nut on the re-pretightening looseness can be researched by not replacing the lower connecting piece 2 and the upper connecting piece 4 and not replacing the tested bolt 11 and the tested nut 3.
In the test process, the influence of the abrasion of the connecting piece on the looseness of the bolted structure can be researched by replacing the tested bolt 11 and the tested nut 3 without replacing the lower connecting piece 2 and the upper connecting piece 4.
Bolt looseness tests can be carried out on bolts of different specifications under the action of eccentric loads by changing the hole diameters of bolt holes of the lower connecting piece 2 and the upper connecting piece 4.
The eccentric load applied in the bolt-on structure eccentric vibration test process can be monitored in real time through the two-dimensional force sensor 8.
The invention has the advantages that: the bolt connection structure under the action of eccentric load can be subjected to loosening test research, and test parameters such as eccentric distance, load frequency (0-25 HZ), load amplitude (0-5 KN) and the like can be changed. The bolt of different specifications can be loosened experimental study through the size that changes connecting piece from top to bottom, and connecting piece can guarantee through change about simultaneously that it keeps unanimous with engineering actual surface to become flexible experimental connecting piece contact surface every time. This not hard up test device is very light, easy operation, and for current large-scale equipment to the bolt test that becomes flexible, the auxiliary assembly that needs is less, possesses higher security.
Drawings
FIG. 1 is a schematic view of the assembly of a looseness testing apparatus
FIG. 2 is a schematic view of a bolt connection structure
FIG. 3 is a schematic view of the lower connector
FIG. 4 is a schematic view of an upper connector
In the figure, 1-loading module, 2-lower connecting piece, 3-measured nut, 4-upper connecting piece, 5-connecting support, 6-damping device, 7-two-dimensional force sensor, 8-height adjusting device, 9-annular pre-tightening force sensor, 10-gasket and 11-measured bolt.
Detailed Description
The following description will be made of an embodiment of the present invention by taking an outer hexagonal M6 bolt as an example in an eccentric pump of a certain type.
Step 1: the lower connecting piece 2 is connected with the loading module 1 through a screw to form a lower connecting piece connected with the driving module, and the eccentric distance is 40 mm.
Step 2: the height adjusting device 8, the two-dimensional force sensor 7, and the damper device 6 are mounted in this order.
And step 3: the connecting bracket 5 is connected with the damping device 6 through screws, and then the upper connecting piece 4 is connected with the connecting bracket 5 through screws, so that the upper connecting piece fixing module is built.
And 4, step 4: the height adjustment device 8 is controlled by software to align the bolt hole axis of the upper attachment member 4 with the bolt hole axis of the lower attachment member 2.
And 5: the lower connecting piece 2, the upper connecting piece 4, the annular pretightening force sensor 9 and the gasket 10 are connected by a tested M6 bolt 11 and a tested nut 3, and a data acquisition line of the annular pretightening force sensor 9 is connected with a data acquisition system.
Step 6: and operating software at the computer end to control the loading module 1 to vibrate, wherein the vibration frequency is 20HZ, the applied eccentric load is 3KN, and the cycle number is 2000.
And 7: and obtaining a pretightening force attenuation curve in data acquisition software.
And 8: and the lower connecting piece 2 and the upper connecting piece 4 are replaced, the eccentric distance is changed to be 50mm, and the contact surface appearance of the bolting structure is ensured to be consistent with the actual surface appearance of the engineering after the connecting pieces are replaced.
And step 9: and (5) repeating the steps 4 to 7.
The foregoing is a further description of the invention with reference to specific preferred embodiments and is not intended to limit the invention thereto. It will be appreciated by those skilled in the art that various modifications, improvements, substitutions and the like can be made without departing from the spirit and scope of the present application.
Claims (10)
1. The utility model provides a bolt structure test device that becomes flexible under considering connecting piece wearing and tearing eccentric load effect which characterized in that: the device includes: the device comprises a loading module (1), a lower connecting piece (2), a tested nut (3), an upper connecting piece (4), a connecting bracket (5), a damping device (6), a two-dimensional force sensor (7), a height adjusting device (8), an annular pre-tightening force sensor (9), a gasket (10) and a tested bolt (11); in the test process, the lower connecting piece (2) is connected with the loading module (1) through a screw, the lower connecting piece (2) and the loading module (1) vibrate together, and the upper connecting piece (4) is fixed on the connecting support (5); the lower connecting piece (2) and the upper connecting piece (4) are bolted with the tested nut (3) through the tested bolt (11), and an annular pre-tightening force sensor (9) is installed at the head of the tested bolt (11) to monitor the pre-tightening force of the bolted structure.
2. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: the lower connecting piece (2) and the upper connecting piece (4) are bolted with the tested nut (3) through the tested bolt (11), an annular pre-tightening force sensor (9) is installed at the head of the tested bolt (11), the annular pre-tightening force sensor (9) is connected with a data acquisition card, the pre-tightening force value of the tested bolt (11) is transmitted to a computer end through the data acquisition card, and therefore the pre-tightening force of the bolted structure is monitored in real time.
3. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: when the lower connecting piece (2) vibrates along with the loading module (1), the upper connecting piece (4) is fixed on the connecting support (5), and the load borne by the tested bolt (11) for connecting the lower connecting piece (2) and the upper connecting piece (4) is eccentric load.
4. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: the motion mode of the loading module (1) is adjusted according to different test parameters, the motion frequency range is 0-25 HZ, and the load amplitude range is 0-5 KN.
5. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: the lower connecting piece (2) is replaced, the height adjusting device (8) moves up and down through the guide rail, and the position of the bolt hole of the upper connecting piece (4) is adjusted through the height adjusting device (8) to be aligned with the axis of the bolt hole of the lower connecting piece (2), so that the purpose of changing the eccentric distance is achieved.
6. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: after the bolt loosening test, the surface of the connecting piece is abraded, the surface appearance of the connecting piece after the loosening test is inconsistent with the actual engineering surface, the lower connecting piece (2) and the upper connecting piece (4) are easy to replace, and the contact surface of the bolt connecting structure is guaranteed to be consistent with the actual engineering surface.
7. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: in the test process, the influence of the abrasion of the connecting piece and the bolt and nut on the re-pretightening looseness is researched by not replacing the lower connecting piece (2) and the upper connecting piece (4) and not replacing the tested bolt (11) and the tested nut (3).
8. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: in the test process, the tested bolt (11) and the tested nut (3) are replaced without replacing the lower connecting piece (2) and the upper connecting piece (4), and the influence of the abrasion of the connecting pieces on the looseness of the bolted structure is researched.
9. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: bolt looseness tests are performed on bolts of different specifications under the action of eccentric loads by changing the hole diameters of bolt holes of the lower connecting piece (2) and the upper connecting piece (4).
10. The test device for the loosening of the bolted structure under the action of the eccentric load considering the abrasion of the connecting piece according to claim 1, is characterized in that: and monitoring the eccentric load applied in the process of the bolt structure eccentric vibration test in real time through a two-dimensional force sensor (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110488176.6A CN113218607A (en) | 2021-05-06 | 2021-05-06 | Bolt connection structure looseness test device under eccentric load effect considering connecting piece abrasion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110488176.6A CN113218607A (en) | 2021-05-06 | 2021-05-06 | Bolt connection structure looseness test device under eccentric load effect considering connecting piece abrasion |
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| CN113218607A true CN113218607A (en) | 2021-08-06 |
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| CN202110488176.6A Pending CN113218607A (en) | 2021-05-06 | 2021-05-06 | Bolt connection structure looseness test device under eccentric load effect considering connecting piece abrasion |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101446022B1 (en) * | 2013-04-02 | 2014-10-01 | 전북대학교산학협력단 | A Fiber optic bolt loosening monitoring system and method |
| CN107036797A (en) * | 2017-05-27 | 2017-08-11 | 西南交通大学 | The experimental rig of bolt looseness under a kind of measurement action of lateral load |
| CN107402126A (en) * | 2017-08-07 | 2017-11-28 | 北京工业大学 | A kind of tangential single bolt relaxation measurement apparatus and method characterized based on modal parameter |
| CN206804284U (en) * | 2017-04-27 | 2017-12-26 | 西南交通大学 | A kind of loosening test device of the lower bolt connection structure of multi-mode load effect |
| CN107543689A (en) * | 2017-08-11 | 2018-01-05 | 北京工业大学 | Double bolt relaxation experimental rigs are determined under a kind of tangential alternate load |
-
2021
- 2021-05-06 CN CN202110488176.6A patent/CN113218607A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101446022B1 (en) * | 2013-04-02 | 2014-10-01 | 전북대학교산학협력단 | A Fiber optic bolt loosening monitoring system and method |
| CN206804284U (en) * | 2017-04-27 | 2017-12-26 | 西南交通大学 | A kind of loosening test device of the lower bolt connection structure of multi-mode load effect |
| CN107036797A (en) * | 2017-05-27 | 2017-08-11 | 西南交通大学 | The experimental rig of bolt looseness under a kind of measurement action of lateral load |
| CN107402126A (en) * | 2017-08-07 | 2017-11-28 | 北京工业大学 | A kind of tangential single bolt relaxation measurement apparatus and method characterized based on modal parameter |
| CN107543689A (en) * | 2017-08-11 | 2018-01-05 | 北京工业大学 | Double bolt relaxation experimental rigs are determined under a kind of tangential alternate load |
Non-Patent Citations (1)
| Title |
|---|
| 杜永强等: "偏心载荷作用下螺栓连接结构的松动行为研究", 《机械工程学报》 * |
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Application publication date: 20210806 |
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