CN215065197U - Looseness testing device for axial load pull-down rivet connection - Google Patents
Looseness testing device for axial load pull-down rivet connection Download PDFInfo
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- CN215065197U CN215065197U CN202120922432.3U CN202120922432U CN215065197U CN 215065197 U CN215065197 U CN 215065197U CN 202120922432 U CN202120922432 U CN 202120922432U CN 215065197 U CN215065197 U CN 215065197U
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Abstract
A looseness testing device for axial load pull-down rivet connection mainly comprises an upper clamping part, a force measuring sensor and a lower clamping part which are coaxially arranged in sequence; the lower end of the upper clamping part is in threaded connection with the upper part of the upper sleeve into a whole, and the upper end of the lower clamping part is in threaded connection with the lower part of the lower sleeve into a whole; the upper end and the lower end of the pull rivet to be tested are respectively fixed in the upper sleeve and the lower sleeve after penetrating through the center of the force transducer. The utility model has simple structure and low test cost; and the pull rivet loosening test under the low-strength connecting material can be carried out.
Description
Technical Field
The utility model relates to a not hard up test device of axial load pull-down rivet connection.
Background
Rivet connection is widely applied to mechanical structures, has the advantages of reliable connection, convenient installation, low maintenance cost and the like, and has great influence on the safety and the reliability of the structure as an important connecting part. When the structures are used, the alternating external force is applied to the structures for a long time, so that the rivet connecting structures are inevitably loosened, and the loosening of fasteners causes machine equipment to break down, so that the reliability of the machine equipment is reduced; even safety accidents can happen, and personal and property safety is seriously threatened. Therefore, the relation between the looseness of the rivet connection structure and the load and the material needs to be found out through experiments, and reliable experimental basis is provided for the design, the manufacture and the use of the rivet connection structure.
At present, the loosening test device of the bolt connection structure under the axial load is more, and the loosening test can be better carried out. However, under axial load (the direction of the load is consistent with the axis of the rivet structure), the loosening test device of the rivet connection structure is few. The loose test device for researching the threaded connection structure acted by the axial load at present comprises the following components: the centers of the opposite front parts of the two same rectangular frames are provided with through holes, and the centers of the rear parts of the rectangular frames are provided with convex clamping ends; the test bolt penetrates through the through hole and is screwed tightly, so that the two rectangular frames are tightly connected; the two gripping ends were then attached to the grips of the tester. The testing machine applies axial load to the test bolt through the clamping end and the rectangular frame to perform loosening test of the bolt connecting structure under the action of the axial load. It has the problems that: the installation of rivet pulling needs special riveting tool, but the rifle head of riveter needs certain space when the operation, and in narrow and small space, the installation of rivet can't be like the bolt installation, thereby exerts fastening torque to the bolt in the plane through adjustment spanner handle length and realize the installation of going on in narrow and small space, consequently needs special test platform, transmission system, anchor clamps system, mounting base and measuring device usually, and it constitutes complicacy, and is expensive.
SUMMERY OF THE UTILITY MODEL
The utility model provides a not hard up test device of axial load pull-down rivet connection can carry out the pull-down rivet under the low strength connecting material not hard up experimental and its simple structure, low in cost.
The utility model discloses realize that its technical scheme that the purpose adopted is:
a looseness testing device for axial load pull-down rivet connection mainly comprises an upper clamping part, a force measuring sensor and a lower clamping part which are coaxially arranged in sequence; the lower end of the upper clamping part is in threaded connection with the upper part of the upper sleeve into a whole, and the upper end of the lower clamping part is in threaded connection with the lower part of the lower sleeve into a whole; the upper end and the lower end of the pull rivet to be tested are respectively fixed in the upper sleeve and the lower sleeve after penetrating through the center of the force transducer.
The upper clamping part, the lower clamping part, the upper sleeve and the lower sleeve are all of cylindrical structures.
Compared with the prior art, the beneficial effects of the utility model are that:
most of the existing test devices are designed for testing the loosening performance of bolts, and because the installation processes of the bolts and the blind rivets are different and the requirements of the bolts and the blind rivets on installation conditions are also different, the test device for testing the loosening of the bolts under the action of axial loads is not suitable for testing the loosening prevention performance of the blind rivets. The device is specially designed for testing the loosening performance of the axial load pull-down rivet and can be used for testing the loosening performance of the axial load pull-down rivet.
In addition, only two sleeve clamping ends and the force measuring sensor are needed in the loosening test process, and the test cost is saved. The axial load is measured and monitored by a high-precision force transducer of the fatigue testing machine, and the clamping force of the pull rivet is recorded and derived in real time by the force transducer.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;
FIG. 3 is an enlarged view of the clamping end of the present invention;
fig. 4 is an enlarged schematic view of the sleeve of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
FIG. 1 shows a looseness testing device for an axial load pull-down rivet connection, which mainly comprises an upper clamping part, a load cell 4 and a lower clamping part which are coaxially arranged in sequence; the lower end 3 of the upper clamping part and the upper part of the upper sleeve 2 are connected into a whole through threads and are used for being tightly connected with the upper clamping part and the circular steel pipe sleeve 2, and the upper end 1 of the upper clamping part is connected with an upper chuck of a fatigue testing machine. Lower clamping part upper end 7 and lower sleeve 8 lower part threaded connection are as an organic whole for clamping part and lower sleeve 8 under the fastening connection, and lower clamping part lower extreme 9 links to each other with fatigue testing machine lower chuck. The upper end and the lower end of a blind rivet 6 to be tested are respectively arranged in the upper sleeve 2 and the lower sleeve 8 after penetrating through the force cell 4, and a sensor data wire 5 is led out from the side surfaces of the upper sleeve and the lower sleeve. The load cell 4 is a washer-type pressure sensor.
Go up clamping part 1, lower clamping part 9, go up sleeve 2, lower sleeve 8 and be the cylinder structure, make things convenient for the installation of rivet and guarantee that the rivet is the atress of axial force in the test procedure.
The utility model discloses a use method is:
the force measuring sensor is arranged at the center of the bottom of the upper sleeve 2 and the top of the lower sleeve 8, the center of a through hole of the sensor is required to be on the same axis with the center of a through hole formed by the upper sleeve and the lower sleeve, and a data wire of the force measuring sensor is led out from the side edges of the upper sleeve and the lower sleeve. The rivet head and the rivet head are contacted to start riveting installation, the rivet gun is taken out from the sleeve after the tail nail is cut off and installed, and then the lower part of the clamping end is screwed into the upper part of the sleeve to finish fastening. And fixing the lower clamping end on a test bed of a fatigue testing machine, clamping the upper clamping end by a chuck of the fatigue testing machine, and applying an axial load to the upper clamping end, so that the loosening test of the pull-down rivet under the axial load is carried out.
Claims (2)
1. The utility model provides an axial load pull-down rivet connection's not hard up test device which characterized in that: mainly comprises an upper clamping part, a force measuring sensor (4) and a lower clamping part which are coaxially arranged in sequence; the lower end (3) of the upper clamping part is connected with the upper part of the upper sleeve (2) into a whole through threads, and the upper end (7) of the lower clamping part is connected with the lower part of the lower sleeve (8) into a whole through threads; the upper end and the lower end of a blind rivet (6) to be tested are respectively fixed in the upper sleeve (2) and the lower sleeve (8) after penetrating through the center of the force measuring sensor (4).
2. The loosening test device for axial load pull-down rivet connection according to claim 1, wherein: the upper clamping part (1), the lower clamping part (9), the upper sleeve (2) and the lower sleeve (8) are all of cylindrical structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922432.3U CN215065197U (en) | 2021-04-30 | 2021-04-30 | Looseness testing device for axial load pull-down rivet connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120922432.3U CN215065197U (en) | 2021-04-30 | 2021-04-30 | Looseness testing device for axial load pull-down rivet connection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215065197U true CN215065197U (en) | 2021-12-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120922432.3U Active CN215065197U (en) | 2021-04-30 | 2021-04-30 | Looseness testing device for axial load pull-down rivet connection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215065197U (en) |
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2021
- 2021-04-30 CN CN202120922432.3U patent/CN215065197U/en active Active
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