CN209910965U - Experimental device for critical looseness load measurement of bolt - Google Patents
Experimental device for critical looseness load measurement of bolt Download PDFInfo
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- CN209910965U CN209910965U CN201921139938.6U CN201921139938U CN209910965U CN 209910965 U CN209910965 U CN 209910965U CN 201921139938 U CN201921139938 U CN 201921139938U CN 209910965 U CN209910965 U CN 209910965U
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Abstract
The utility model discloses an experimental device of critical not hard up load survey of bolt, including the frame, the frame upper surface is equipped with fixed bolster and mounting fixture, and the fixed bolster is connected with servo electronic jar, is equipped with force transducer on servo electronic jar's the actuating lever, and the free end of actuating lever is connected with the excitation board through the connecting plate, and excitation board and mounting fixture parallel arrangement, both pass and fastening connection by the experiment bolt, are equipped with bearing between excitation board and the mounting fixture. The utility model discloses an on the basis of current transverse vibration platform both realize carrying out real-time measurement to the bolt pretightning force, need can realize the experiment under the different structure influence parameter operating mode condition in order.
Description
Technical Field
The utility model belongs to the technical field of the bolt coupling piece capability test, especially, critical not hard up experimental apparatus of load survey of bolt for the critical not hard up load of bolt of multiple operating mode combination under the effect of survey transverse load.
Background
The bolt connection has the advantages of convenient disassembly, simple structure, good connection performance and the like, so the bolt connection is widely applied to connection of modern engineering structures and mechanical equipment. The bolt connection has good connection performance when receiving static load, but when receiving dynamic load such as impact, circulation, bolt connection node often can take place not hard up or fatigue failure scheduling problem, and the bolt becomes flexible and loses efficacy the most often. The loose bolt connection can cause the reduction of the connection performance, so that the pretightening force of the bolt connection is reduced, and even the pretightening force of the bolt is completely lost, thereby influencing the mechanical properties of the bolt connection and even the whole structure.
The loosening of the threaded connection under transverse loads is mainly manifested by a relative rotation of the nut and the screw. On the other hand, in the aspect of thread stress, the bolt rod can be subjected to bending deformation under the action of transverse load, so that the contact pressure on the thread surface is changed, and the phenomenon of local loosening of the thread surface is easily caused. Obviously, the thread stress is more complicated under the action of the transverse load, and the bolt connection is more easily loosened. At present, a vibration exciter or a fastener loosening tester is basically used for testing bolt loosening under the action of a transverse load, for example, a testing device for measuring bolt loosening under the action of the transverse load disclosed in the patent No. CN 107036797B drives a first clamping plate and a second clamping plate to reciprocate through a hydraulic fatigue testing machine, so that the load of a vibration source is transmitted to a test bolt and a test nut, the continuous adjustment of transverse loading amplitude and frequency is realized, and the loosening characteristics (clamping force and nut rotation angle), the transverse load and displacement of the bolt can be monitored in real time. However, the device is limited in applicable working conditions, can only realize the working conditions of applying different external loads, and cannot realize the measurement of bolt connection looseness under the influence parameters of the structure of the bolt connection.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an experimental apparatus of critical not hard up load survey of bolt, the device be on current transverse vibration platform's basis both realize carrying out real-time measurement to the bolt pretightning force, also need can realize the experiment under the different structure influence parameter operating mode condition.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: the utility model provides an experimental apparatus for critical not hard up load survey of bolt, includes the frame, its characterized in that the frame upper surface is equipped with fixed bolster and mounting fixture, the fixed bolster is connected with servo electronic jar, is equipped with force sensor on servo electronic jar's the actuating lever, and the free end of actuating lever is connected with the excitation board through the connecting plate, and excitation board and mounting fixture parallel arrangement, both pass and the fastening connection by the experiment bolt, are equipped with bearing between excitation board and the mounting fixture.
The above scheme is further preferably selected, the fixing clamp comprises a vertical fixing plate and a transverse cantilever plate, the lower end of the vertical fixing plate is fixed on the surface of the rack through a base, a threaded hole for fixing the cover plate is formed in the upper end of the vertical fixing plate, the exciting plate is located between the cover plate and the transverse cantilever plate, the vertical fixing plate, the exciting plate and the transverse cantilever plate are penetrated and fastened by an experiment bolt, and a needle bearing is arranged between the exciting plate and the transverse cantilever plate.
In a further preferable mode of the scheme, the experimental bolt comprises a bolt head, a threaded section and a cylindrical section, wherein a 0-degree strain gauge and a 180-degree strain gauge are attached to symmetrical positions of the side surface of the cylindrical section.
Preferably, the bolt holes of the transverse cantilever plate, the vibration exciting plate and the cover plate are provided with expanding grooves, the expanding grooves accommodate 0-degree strain gauges and 180-degree strain gauges, the bolt holes on the lower surface of the transverse cantilever plate are provided with square sinking grooves, and the square sinking grooves accommodate bolt heads.
Preferably, the upper surface of the transverse cantilever plate and the lower surface of the cover plate are provided with bearing sinking grooves for accommodating the needle roller bearings, and the upper surface and the lower surface of the excitation plate are provided with through grooves matched with the needle roller bearings.
Preferably, the connecting plate is an L-shaped structure, one end of the connecting plate is in threaded connection with the driving rod, and the other end of the connecting plate is connected with the excitation plate.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in:
(1) the utility model discloses in through servo electronic jar drive, the board that shakes is swashed in the pulling, and the atress is transversely sheared to the simulation experiment bolt under the vibration operating mode, realizes carrying out real-time measurement to the bolt pretightning force, wherein shakes and places bearing in order to reduce the friction between board, horizontal cantilever board and the apron, and mounting fixture and apron accessible fastening bolt couple together, pastes the foil gage on the experiment bolt and measures the bolt pretightning force, can realize the experiment under the multiple operating mode.
(2) In the utility model, the bolt holes on the exciting plate, the transverse cantilever plate and the cover plate need to be opened with expanding grooves to prevent the strain gauge from being damaged, the bottom of the fixing clamp needs to be opened with square sinking grooves to limit the rotation of the bolt, and simultaneously, the measurement of different parameters of the bolt under the conditions of single shearing and double shearing can be realized;
(3) the utility model provides an it needs open the heavy groove and fix the kingpin to place bearing department between sharp vibrating plate, mounting fixture and the apron, can realize the experiment under the tight length operating mode of difference clamp through the bearing that uses different diameters simultaneously.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic view of the assembly of a single shear model according to the present invention;
FIG. 3 is a schematic view of the assembly of the middle double shear model of the present invention;
fig. 4 is a front view of the fixing clip of the present invention;
fig. 5 is a top view of the fixing clip of the present invention;
FIG. 6 is a schematic structural view of the cover plate of the present invention;
FIG. 7 is a schematic structural view of a transverse cantilever plate according to the present invention;
FIG. 8 is a schematic view of the structure of the experimental bolt for attaching the strain gauge of the present invention;
in the figure: 1. the device comprises an excitation plate, 2, a fixing clamp, 3, a cover plate, 4, a fastening bolt, 5, an experiment bolt, 6, a fixing support, 7, a servo electric cylinder, 8, a rack, 9, a force sensor, 10, a connecting plate, 11, an expansion groove, 12, a square sinking groove, 13, a bearing sinking groove, 14, a through groove, 15, 0-degree strain gauges and 16, 180-degree strain gauges.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The utility model particularly relates to an experimental apparatus of critical not hard up load determination of bolt, can know according to figure 1, the device includes frame 8, and frame 8 below is fixed, and frame 8 upper surface is the plane, is equipped with fixed bolster 6 and mounting fixture 2 at frame 8 upper surface, and fixed bolster 6 passes through the bolt fastening in frame 8. A servo electric cylinder 7, a connecting plate 10 and an excitation plate 1 are arranged between the fixed support 6 and the fixed clamp 2. The fixed support 6 is hinged with the servo electric cylinder 7, a driving rod of the servo electric cylinder 7 is provided with a force sensor 9, and the force sensor 9 monitors the pulling force exerted on the excitation plate 1 by the servo electric cylinder 7 in real time and is used for measuring the transverse excitation force; the free end of the driving rod is connected with the vibration exciting plate 1 through a connecting plate 10, the connecting plate 10 is of an L-shaped structure, one end of the connecting plate is in threaded connection with the driving rod, and the other end of the connecting plate is connected with the vibration exciting plate 1. The excitation plate 1 and the fixing clamp 2 are arranged in parallel, the excitation plate and the fixing clamp are connected in a fastening mode through an experiment bolt 5, and a needle bearing is arranged between the excitation plate 1 and the fixing clamp 2.
In the structural arrangement, the servo electric cylinder 7 pulls the connecting plate 10, relative sliding trend is generated between the connecting plate 10 and the fixing clamp 2, shearing damage is generated on the experiment bolt 5 connected between the connecting plate 10 and the fixing clamp 2, and real-time measurement of bolt pretightening force is realized by the measuring equipment.
In practical bolt connection, the bolt usually forms two stress modes of single shearing or double shearing, so two devices are designed to respectively simulate the two working conditions, as shown in the attached figures 2 and 3.
FIG. 2 is a schematic diagram of a single-shearing model assembly, FIG. 3 is a schematic diagram of a double-shearing model assembly, the double-shearing model is that a cover plate 3 is added above a fixing clamp 2 on the basis of the single-shearing model, the cover plate 3 and the fixing clamp 2 are connected through a fastening bolt 4, and an excitation plate 1 is arranged between the cover plate 3 and the fixing clamp 2.
The utility model provides a mounting fixture 2 comprises 4 parts, including vertical fixed plate, horizontal cantilever plate, base and floor, use through welding into a whole, as shown in figures 4 and 5. Wherein vertical fixed plate lower extreme is fixed in 8 surfaces of frame through the base, and vertical fixed plate upper end is offered the screw hole that is used for fixed apron 3, and excitation plate 1 is in between apron 3 and the horizontal cantilever board, and the three passes and fastening connection by experiment bolt 5, also sets up bearing between excitation plate 1 and the horizontal cantilever board.
In the structural arrangement, the needle roller bearing is arranged, so that the influence of friction on an experiment can be reduced through rolling friction and lubricating oil. To accommodate the needle bearings, 6 rectangular bearing recesses 13 are provided in the upper surface of the transverse cantilever plate, and the clamping length can be varied directly by varying the diameter of the needle bearings. The surface sets up and leads to groove 14 with bearing complex about sharp vibrating plate 1, and the degree of depth is 1mm, leads to groove itself and is in order to place antifriction bearing, reduces the influence of friction to the experiment through rolling friction and lubricating oil, thereby the upper and lower surface all has to lead to the groove and can satisfy the experiment of single two kinds of models of cuting and double-cropping. 6 grooves for placing roller pins are also formed in the lower surface of the cover plate 3, so that a double-shear model experiment is completed in a matching manner.
In order to facilitate the measurement of the shearing force borne by the experimental bolt 5, the experimental bolt 5 is composed of a bolt head, a threaded section and a cylindrical section, as shown in fig. 8, wherein a 0-degree strain gauge 15 and a 180-degree strain gauge 16 are attached to the side symmetrical positions of the cylindrical section. As shown in fig. 5, a square sinking groove 12 is formed in the lower surface of the transverse cantilever plate in the fixing clamp 2, a bolt head sinks into the square sinking groove 12 when an experimental bolt is clamped, and the opposite sides of the square sinking groove 12 are tightly clamped with a group of opposite sides of a hexagonal bolt head, so that the bolt is ensured not to rotate when pretightening force is applied, and a strain gauge is damaged. Meanwhile, as shown in fig. 6 and 7, two sides of the bolt holes of the transverse cantilever plate, the excitation plate 1 and the cover plate 3 in the fixing clamp 2 are respectively provided with an expanding groove 11, and a strain gauge adhered to the surface of the cylindrical section of the bolt rod is sunk into the expanding groove 11 when the experimental bolt 5 is clamped, so that the strain gauge is prevented from being extruded with a connecting piece due to transverse load, and errors and even the damage of the strain gauge are avoided. After the experiment bolt 5 is clamped, the lead of the strain gauge is led out from the shallow groove on the transverse cantilever plate in the fixing clamp 2 and is bonded on the lower surface of the fixing plate in the fixing clamp 2, so that the distortion of the measurement result caused by extrusion or vibration and other reasons in the experiment is prevented.
The utility model discloses when the experiment, servo electronic jar 7 is passed through hinged joint and is fixed in frame 8 for fixed bolster 6 and excitation, and servo electronic cylinder end portion installs force sensor 9 for measure the size of horizontal exciting force, the excitation tip is connected with excitation plate 1 through "L" shape connecting plate 10, and mounting fixture 6 passes through the bolt fastening for the experiment on frame 8, and cooperation collection equipment accomplishes data acquisition in the experimentation.
Claims (6)
1. The utility model provides an experimental apparatus for critical not hard up load survey of bolt, includes frame (8), its characterized in that frame (8) upper surface is equipped with fixed bolster (6) and mounting fixture (2), fixed bolster (6) are connected with servo electronic jar (7), are equipped with force sensor (9) on the actuating lever of servo electronic jar (7), and the free end of actuating lever is connected with excitation board (1) through connecting plate (10), and excitation board (1) and mounting fixture (2) parallel arrangement, both pass and fastening connection by experiment bolt (5), are equipped with bearing between excitation board (1) and mounting fixture (2).
2. The experimental device for testing the critical loosening load of the bolt according to claim 1, wherein the fixing clamp (2) comprises a vertical fixing plate and a transverse cantilever plate, wherein the lower end of the vertical fixing plate is fixed on the surface of the frame (8) through a base, the upper end of the vertical fixing plate is provided with a threaded hole for fixing the cover plate (3), the vibration exciting plate (1) is arranged between the cover plate (3) and the transverse cantilever plate, the three are penetrated and fastened by the experimental bolt (5), and a needle bearing is arranged between the vibration exciting plate (1) and the transverse cantilever plate.
3. The experimental device for testing the critical loosening load of the bolt according to claim 2, wherein the experimental bolt (5) consists of a bolt head, a threaded section and a cylindrical section, wherein a 0-degree strain gauge (15) and a 180-degree strain gauge (16) are attached to the side symmetrical positions of the cylindrical section.
4. The experimental device for testing the critical loosening load of the bolt according to claim 3, wherein the bolt holes of the transverse cantilever plate, the vibration exciting plate (1) and the cover plate (3) are provided with expanding grooves (11), the expanding grooves (11) accommodate 0-degree strain gauges (15) and 180-degree strain gauges (16), the bolt holes of the lower surface of the transverse cantilever plate are provided with square sinking grooves (12), and the square sinking grooves (12) accommodate the bolt heads.
5. The experimental device for testing the critical loosening load of the bolt according to any one of claims 2 to 4, wherein the upper surface of the transverse cantilever plate and the lower surface of the cover plate (3) are provided with bearing sunken grooves (13) for accommodating the needle bearings, and the upper surface and the lower surface of the excitation plate (1) are provided with through grooves (14) matched with the needle bearings.
6. The experimental device for testing the critical loosening load of the bolt according to claim 1, wherein the connecting plate (10) is an L-shaped structure, one end of the connecting plate is in threaded connection with the driving rod, and the other end of the connecting plate is connected with the excitation plate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921139938.6U CN209910965U (en) | 2019-07-19 | 2019-07-19 | Experimental device for critical looseness load measurement of bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921139938.6U CN209910965U (en) | 2019-07-19 | 2019-07-19 | Experimental device for critical looseness load measurement of bolt |
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| Publication Number | Publication Date |
|---|---|
| CN209910965U true CN209910965U (en) | 2020-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921139938.6U Expired - Fee Related CN209910965U (en) | 2019-07-19 | 2019-07-19 | Experimental device for critical looseness load measurement of bolt |
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| CN (1) | CN209910965U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639975A (en) * | 2021-06-24 | 2021-11-12 | 江苏徐工工程机械研究院有限公司 | Bolt pretightening force attenuation testing device and testing method in vibration process |
| CN114152423A (en) * | 2021-12-03 | 2022-03-08 | 南京航空航天大学 | Bolt connection looseness experimental device under complex load |
-
2019
- 2019-07-19 CN CN201921139938.6U patent/CN209910965U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113639975A (en) * | 2021-06-24 | 2021-11-12 | 江苏徐工工程机械研究院有限公司 | Bolt pretightening force attenuation testing device and testing method in vibration process |
| CN113639975B (en) * | 2021-06-24 | 2024-05-31 | 江苏徐工工程机械研究院有限公司 | Bolt pretightening force attenuation testing device and method in vibration process |
| CN114152423A (en) * | 2021-12-03 | 2022-03-08 | 南京航空航天大学 | Bolt connection looseness experimental device under complex load |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200107 Termination date: 20200719 |