CN112629843B - Clamp special for mechanical property test of multi-strand arc spring - Google Patents
Clamp special for mechanical property test of multi-strand arc spring Download PDFInfo
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- CN112629843B CN112629843B CN202011459238.2A CN202011459238A CN112629843B CN 112629843 B CN112629843 B CN 112629843B CN 202011459238 A CN202011459238 A CN 202011459238A CN 112629843 B CN112629843 B CN 112629843B
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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
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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Abstract
The invention relates to the field of arc-shaped spring clamps, in particular to a special clamp for mechanical property tests of multi-strand arc-shaped springs, which comprises a flange plate, a base, a guide rail and a positioning mechanism, wherein the positioning mechanism comprises a plurality of positioning units, each positioning unit comprises a screw rod, an outer side positioning block and an inner side positioning part, the screw rods are in threaded connection with the side walls of the base, and the rotation of the screw rods can drive the outer side positioning blocks to slide; the inner side positioning portion comprises a first positioning piece, a second positioning piece, a T-shaped pipe, a spring, a pull wire and a winding wheel, the first positioning piece and the second positioning piece are hinged to be arranged on the outer side positioning block, the spring is arranged in the T-shaped pipe, the winding wheel is fixedly connected with the screw rod, one end of the pull wire is wound on the winding wheel, the other end of the pull wire is connected with the first positioning piece and the second positioning piece, and a connecting block capable of being fixedly connected with the outer side positioning block is fixed on the guide rail. When the technical scheme is adopted, the arc springs with different arc lengths under the same pitch circle size can be fixed for testing.
Description
Technical Field
The invention relates to the field of arc-shaped spring clamps, in particular to a special clamp for mechanical property tests of a multi-strand arc-shaped spring.
Background
The fatigue test of the spring is a key process for detecting the performance of the spring, particularly key springs such as an engine valve spring, an oil pump plunger spring, a clutch spring, a motorcycle damping spring, an automobile suspension spring and the like, the reliability evaluation and the fatigue screening test of the fatigue performance of the spring product are required to be carried out, and the spring which is not subjected to the fatigue screening test often has failure phenomena such as rigidity reduction, size change and even spring breakage in use, so that the fatigue test is carried out by using a liquid fatigue testing machine after the spring is positioned and clamped by using a clamp.
The fatigue test usually involves the test of several arc length's of different arcs under the same pitch circle size, consequently need change different test equipment usually in experimental time, because change test equipment all need be connected with liquid fatigue test again at every turn, not only inconvenient, cause the increase of cost moreover.
Disclosure of Invention
The invention aims to provide a clamp which is beneficial to fixing arc springs with different arc lengths under the same pitch circle size for testing.
In order to achieve the purpose, the technical scheme of the invention provides a special clamp for mechanical property tests of multi-strand arc springs, which comprises a flange plate, a base, a guide rail and a positioning mechanism, wherein the flange plate is coaxially connected with a turntable, and the turntable is detachably connected with a shifting strip; a first step groove and a second step groove are arranged in the base, and a sliding groove is formed in the side wall of the first step groove;
the positioning mechanism comprises a plurality of positioning units, each positioning unit comprises a screw, an outer side positioning block and an inner side positioning part, the outer side positioning block is arranged in the sliding groove in a sliding manner, the screw is in threaded connection with the side wall of the base, and the screw can drive the outer side positioning block to slide in the sliding groove by rotation; the inner side positioning part comprises a first positioning piece, a second positioning piece, a T-shaped pipe, a spring, a pull wire and a winding wheel, the first positioning piece and the second positioning piece are hinged to the outer side positioning block, the T-shaped pipe is fixedly connected with the outer side positioning block, the spring is arranged in the T-shaped pipe, two ends of the spring are respectively contacted with the first positioning piece and the second positioning piece, the winding wheel is fixedly connected with a screw, the pull wire comprises a main wire and two branch wires, the main wire is wound on the winding wheel, and the two branch wires are respectively connected with the first positioning piece and the second positioning piece through the T-shaped pipe;
the guide rail is including being curved two sections opening ring, and the tip of every section opening ring all is equipped with the breach, and the one end of every section opening ring all is fixed with a dog in breach department, all is fixed with on every section opening ring can with outside locating piece fixed connection's connecting block.
The technical effect of the scheme is as follows: when the arc spring is tested, the base is fixedly connected with one end of the liquid fatigue testing machine, and then the flange plate is fixedly connected with the other end of the liquid fatigue testing machine; the arc spring is installed in the opening circular ring, one end of the arc spring is enabled to be abutted to the stop block, then the two opening circular rings are spliced into a circular guide rail, the guide rail is placed between the outer side positioning block, the first positioning piece and the second positioning piece, the guide rail is fixed on the outer side positioning block through the connecting block, then the liquid fatigue testing machine drives the shifting strip to be inserted into the guide rail at the notch, and in the process of driving the rotating disc to rotate through the flange plate, the shifting strip compresses the arc spring, and therefore mechanical testing is conducted.
When the arc spring of the different arc lengths under the same pitch circle size need be changed and is tested, change the guide rail that corresponds the size can, pack the arc spring into the guide rail and when fixing the guide rail again, can have the guide rail not with the problem of axle center of base, the ring flange can influence experimental degree of accuracy when the strip is dialled in the drive to the arc spring when carrying out the application of force experiment like this.
Specifically, when an arc spring with a shorter arc length under the same pitch circle size needs to be tested, the outer positioning block is driven to slide in the sliding groove by rotating the screw rod, the rolling wheel is driven to rotate in the rotating process of the screw rod, so that the stay wire is wound on the rolling wheel, and the first positioning piece and the second positioning piece are driven to rotate and approach to each other by the stay wire; when the guide rail that will have a shorter diameter is relocated between outside locating piece and No. two locating pieces, through observing whether the edge of locating piece and No. two locating pieces all contacts with the guide rail is inboard in each positioning unit, can judge whether the guide rail is with the base axiality, drive outside locating piece promptly through the screw rod, locating piece and No. two locating pieces not only can fix a position the guide rail, can also detect the axiality of guide rail and base, thereby improve experimental degree of accuracy.
Furthermore, a through hole is formed in the outer side positioning block, the screw rod penetrates through the through hole and the side wall of the base, a limiting groove is formed in the side wall of the through hole, a rotary pushing block is fixedly connected to the screw rod, and the rotary pushing block is rotatably arranged in the limiting groove. The technical effect of the scheme is as follows: the normal movement of the outside positioning block can not be interfered in the rotating process of the screw.
Further, a strip-shaped groove is formed in the shifting strip, and a bolt is connected to the inner thread of the strip-shaped groove. The technical effect of the scheme is as follows: the distance of the poking strip extending out of the turntable is convenient to adjust,
furthermore, be fixed with the gag lever post on the carousel, the gag lever post contacts with dialling the strip. The technical effect of the scheme is as follows: the stability of the shifting strip when driving the arc spring to compress is improved.
Furthermore, the lower end of the sliding chute is wedge-shaped. The technical effect of the scheme is as follows: the stability of the outside positioning block is improved.
Furthermore, a rubber pad is arranged on the screw rod and is positioned on the outer side of the base. The technical effect of the scheme is as follows: it is convenient to rotate the screw.
Furthermore, a gap is arranged on the track, and the ratio of the width of the gap to the arc length of the opening ring is 2. The technical effect of the scheme is as follows: under the prerequisite of guaranteeing that the arc spring can not drop from the track, it can not cause the guide rail to dialling the interference of strip to dial when dialling the strip and passing through from the gap.
Drawings
FIG. 1 is a three-dimensional schematic view of a flange, a turntable, and a dial bar according to an embodiment of the present invention;
FIG. 2 is a three-dimensional schematic view of a base and a positioning mechanism;
FIG. 3 is a three-dimensional schematic view of a positioning unit;
fig. 4 is a three-dimensional schematic view of a guide rail.
Detailed Description
The following is further detailed by way of specific embodiments:
reference numerals in the drawings of the specification include: the device comprises a flange plate 1, a base 2, a guide rail 3, a rotary table 4, a shifting strip 5, a limiting rod 6, a sliding groove 7, a screw rod 8, an outer side positioning block 9, a limiting groove 10, a rotary pushing block 11, a first positioning sheet 12, a second positioning sheet 13, a pull wire 14, a winding wheel 15, a vertical pipe 16, a transverse pipe 17, a gap 18, a stop block 19 and a connecting block 20.
The embodiment is as follows:
the examples are substantially as shown in figures 1 to 4 of the accompanying drawings: the special clamp for the mechanical property test of the multi-strand arc spring as shown in the figures 1 and 2 comprises a flange plate 1, a base 2, a guide rail 3 and a positioning mechanism, wherein the flange plate 1 as shown in the figure 1 is used for being fixedly connected with one end of a liquid fatigue testing machine, a connecting rod is coaxially welded on the flange plate 1, a turntable 4 is coaxially welded on the connecting rod, and two oppositely arranged shifting strips 5 are detachably connected on the turntable 4; the shifting strip 5 and the rotary table 4 are respectively provided with a strip-shaped groove, and the bolt is in contact with the strip-shaped grooves and is tightly propped against the rotary table 4, so that the fixed connection between the shifting strip 5 and the flange plate 1 is realized; the welding has gag lever post 6 on the carousel 4, and gag lever post 6 and dialling strip 5 contact.
As shown in fig. 2, a first step groove and a second step groove are formed in the base 2, the base 2 is used for being fixedly connected with the other end of the liquid fatigue testing machine, and a sliding groove 7 is formed in the side wall of the first step groove. The positioning mechanism comprises four positioning units, as shown in fig. 3, each positioning unit comprises a screw 8, an outer side positioning block 9 and an inner side positioning part, the outer side positioning block 9 is arranged in the sliding groove 7 in a sliding manner, and the lower end of the sliding groove 7 can be arranged to be wedge-shaped as shown in fig. 2 in order to improve the moving stability of the outer side positioning block 9.
As shown in fig. 3, a through hole is formed in the outer side positioning block 9, the screw 8 penetrates through the through hole and the side wall of the base 2, the screw 8 is in threaded connection with the side wall of the base 2, and a rubber pad is adhered to the screw 8 and located on the outer side of the base 2 in fig. 2.
As shown in fig. 3, a limiting groove 10 is formed in a side wall of the through hole, a rotation pushing block 11 is welded on the screw 8, and the rotation pushing block 11 is rotatably arranged in the limiting groove 10. The inner side positioning part comprises a first positioning piece 12, a second positioning piece 13, a T-shaped pipe, a spring, a stay wire 14 and a winding wheel 15, wherein the first positioning piece 12 and the second positioning piece 13 are hinged on the outer side positioning block 9 through hinges; the T-shaped pipe comprises a vertical pipe 16 and a transverse pipe 17, the lower end of the vertical pipe 16 is welded with the outer side positioning block 9, the spring is arranged in the transverse pipe 17, and two ends of the spring are respectively connected with the first positioning piece 12 and the second positioning piece 13; the winding wheel 15 is welded with the screw 8, the stay wire 14 comprises a main wire and two branch wires, the main wire is wound on the winding wheel 15, and the two branch wires are respectively connected with the first positioning piece 12 and the second positioning piece 13 after passing through the T-shaped pipe.
In the embodiment, three guide rails 3 with different diameters are taken as an example, wherein the diameters of the pull wire 14 and the winding wheel 15 are designed in the same size, so that when the screw 8 rotates to drive the outer positioning block 9 to reach a specified position, if the guide rail 3 and the base 2 are coaxial, the edges of the first positioning piece 12 and the second positioning piece 13 are both in contact with the inner side of the guide rail 3.
As shown in fig. 4, the guide rail 3 includes two arc-shaped open rings, a gap 18 is formed on the rail, and the ratio of the width of the gap 18 to the arc length of the open ring is 2, wherein after the guide rail 3 is placed between the outer side positioning block and the first positioning block 12 and the second positioning block 13, the upper surfaces of the first positioning block 12 and the second positioning block 13 are located below the gap 18; the end part of each section of the opening circular ring is provided with a notch, and one end of each section of the opening circular ring is welded with a stop block 19 at the notch; each section of the opening ring is welded with a connecting block 20, the connecting block 20 is provided with a threaded hole, and when the guide rail 3 is placed among the outer side positioning block 9, the first positioning piece 12 and the second positioning piece 13 shown in the figures 2 and 3, the connecting block 20 can be fixedly connected with the outer side positioning block 9 through bolts.
The specific implementation process is as follows:
when the arc spring is tested, the base 2 is fixedly connected with one end of a liquid fatigue testing machine, and then the flange plate 1 is fixedly connected with the other end of the liquid fatigue testing machine; the arc-shaped spring is arranged in the opening circular ring, one end of the arc-shaped spring is abutted against the stop block, then the two opening circular rings are spliced into a circular guide rail 3 shown in figure 4, the guide rail 3 is placed between an outer side positioning block 9, a first positioning sheet 12 and a second positioning sheet 13 shown in figure 2, then the guide rail 3 is fixed on the outer side positioning block 9 through a connecting block 20, then the liquid fatigue testing machine drives a shifting strip 5 shown in figure 1 to be inserted into the guide rail 3 at the notch of figure 4, and in the process of driving the rotary table 4 to rotate through the flange plate 1, the shifting strip 5 compresses the arc-shaped spring, so that a mechanical test is performed.
When an arc spring with a shorter arc length under the same pitch circle size needs to be tested, the outer side positioning block 9 is driven to slide in the chute 7 in fig. 2 by rotating the screw 8 in fig. 3, the winding wheel 15 in fig. 3 is driven to rotate in the rotating process of the screw 8, so that the pull wire 14 is wound on the winding wheel 15, and the first positioning sheet 12 and the second positioning sheet 13 are driven to rotate and approach to each other by the pull wire 14; when the guide rail 3 with a shorter diameter is placed between the outer side positioning block 9, the first positioning piece 12 and the second positioning piece 13 again, whether the edges of the first positioning piece 12 and the second positioning piece 13 in each positioning unit are in contact with the inner side of the guide rail 3 can be judged, whether the guide rail 3 is coaxial with the base 2 can be judged, namely, the outer side positioning block 9 is driven through the screw rod 8, the first positioning piece 12 and the second positioning piece 13 can not only position the guide rail 3, but also can detect the coaxiality of the guide rail 3 and the base 2, and therefore the test accuracy is improved.
The foregoing is merely an example of the present invention and common general knowledge of known specific structures and features of the embodiments is not described herein in any greater detail. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent.
Claims (7)
1. The utility model provides a experimental special fixture of stranded arc spring mechanical properties which characterized in that: the device comprises a flange plate, a base, a guide rail and a positioning mechanism, wherein the flange plate is coaxially connected with a turntable, and the turntable is detachably connected with a shifting strip; a first step groove and a second step groove are arranged in the base, and a sliding groove is formed in the side wall of the first step groove;
the positioning mechanism comprises a plurality of positioning units, each positioning unit comprises a screw rod, an outer side positioning block and an inner side positioning part, the outer side positioning block is arranged in the sliding groove in a sliding mode, the screw rods are in threaded connection with the side wall of the base, and the outer side positioning blocks can be driven to slide in the sliding groove by the rotation of the screw rods; the inner side positioning part comprises a first positioning piece, a second positioning piece, a T-shaped pipe, a spring, a pull wire and a winding wheel, the first positioning piece and the second positioning piece are hinged to the outer side positioning block, the T-shaped pipe is fixedly connected with the outer side positioning block, the spring is arranged in the T-shaped pipe, two ends of the spring are respectively contacted with the first positioning piece and the second positioning piece, the winding wheel is fixedly connected with a screw, the pull wire comprises a main wire and two branch wires, the main wire is wound on the winding wheel, and the two branch wires are respectively connected with the first positioning piece and the second positioning piece through the T-shaped pipe;
the guide rail comprises two arc-shaped open circular rings, the end part of each open circular ring is provided with a notch, one end of each open circular ring is fixed with a stop block at the notch, and each open circular ring is fixed with a connecting block which can be fixedly connected with an outer side positioning block;
when the arc spring is tested, the base is fixedly connected with one end of the liquid fatigue testing machine, and then the flange plate is fixedly connected with the other end of the liquid fatigue testing machine; the arc spring is arranged in the opening circular ring, one end of the arc spring is abutted to the stop block, then the two opening circular rings are spliced into a circular guide rail, the guide rail is placed between the outer side positioning block, the first positioning piece and the second positioning piece, the guide rail is fixed on the outer side positioning block through the pressing strip, then the liquid fatigue testing machine drives the shifting strip to be inserted into the guide rail at the notch, and the shifting strip compresses the arc spring in the process of driving the rotary disc to rotate through the flange plate.
2. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 1, wherein: the outer side positioning block is provided with a through hole, the screw rod penetrates through the through hole and the side wall of the base, the side wall of the through hole is provided with a limiting groove, the screw rod is fixedly connected with a rotary pushing block, and the rotary pushing block is rotatably arranged in the limiting groove.
3. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 2, wherein: a strip-shaped groove is formed in the shifting strip, and a bolt is connected to the inner thread of the strip-shaped groove.
4. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 3, wherein: a limiting rod is fixed on the turntable and is in contact with the shifting strip.
5. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 4, wherein: the lower end of the sliding groove is wedge-shaped.
6. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 5, wherein: the screw is provided with a rubber pad which is positioned at the outer side of the base.
7. The special clamp for the mechanical property test of the multi-strand arc spring as claimed in claim 6, wherein: be equipped with the gap on the track, the proportion of the width of gap and opening ring arc length is 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011459238.2A CN112629843B (en) | 2020-12-11 | 2020-12-11 | Clamp special for mechanical property test of multi-strand arc spring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011459238.2A CN112629843B (en) | 2020-12-11 | 2020-12-11 | Clamp special for mechanical property test of multi-strand arc spring |
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| Publication Number | Publication Date |
|---|---|
| CN112629843A CN112629843A (en) | 2021-04-09 |
| CN112629843B true CN112629843B (en) | 2022-12-20 |
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| CN202011459238.2A Active CN112629843B (en) | 2020-12-11 | 2020-12-11 | Clamp special for mechanical property test of multi-strand arc spring |
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| CN112629843A (en) | 2021-04-09 |
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