CN218382047U - Bar tensile sample clamp - Google Patents
Bar tensile sample clamp Download PDFInfo
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- CN218382047U CN218382047U CN202222324277.2U CN202222324277U CN218382047U CN 218382047 U CN218382047 U CN 218382047U CN 202222324277 U CN202222324277 U CN 202222324277U CN 218382047 U CN218382047 U CN 218382047U
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Abstract
The utility model relates to the field of testing machine clamp equipment, in particular to a bar tensile sample clamp, which comprises two clamping pieces capable of being arranged on a testing machine; the clamping piece is provided with reducing jaws, the reducing jaws of the clamping piece are opposite to form a clamping channel after assembly, the radial cross section of the clamping channel is circular, and a reducing conical surface used for bearing the tensile strength of the bar test piece is arranged in the reducing jaws. The utility model discloses an increase bar test piece and anchor clamps's friction surface, prevent to produce the problem of skidding among the tensile test process, avoid the bar test piece to shift a small amount in the test process and arouse that the test curve phenomenon appears shaking and dropping.
Description
Technical Field
The utility model relates to a testing machine anchor clamps equipment field, concretely relates to bar tensile sample anchor clamps.
Background
The universal tester is a material tester integrating the functions of stretching, bending, compressing, shearing, ring stiffness and the like, and is mainly used for mechanical property tests of metal and non-metal materials, such as a microcomputer control electro-hydraulic servo universal tester. At present, when a microcomputer-controlled electro-hydraulic servo universal testing machine is used for performing a tensile test on a bar, two clamps with flat jaws are respectively used for clamping two ends of the bar, and the testing machine applies a large force to the bar through the clamps for clamping.
However, because the plane wall surface of the flat jaw of the clamp and the curved surface wall surface of the bar are less in friction surface, the clamp is easy to slip to generate a small amount of displacement, so that a test curve representing the stress strain of the bar test piece under the action of the tensile force, which is obtained in the test of a testing machine, has a shaking and dropping phenomenon, and the test curve cannot accurately represent the performance of the bar test piece under the preset tensile force condition. The jitter-down phenomenon is a jitter or a dip section in the test curve of the smoothed stress strain that occurs at a position without the change.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a bar tensile sample anchor clamps to solve anchor clamps and bar and directly can produce the problem of a small amount of aversions.
The bar tensile sample clamp in the scheme comprises two clamping pieces which can be arranged on a testing machine;
the clamping piece is provided with reducing jaws, the two reducing jaws of the clamping piece are opposite to each other to form a clamping channel after being assembled, the radial cross section of the clamping channel is circular, and a reducing conical surface used for bearing the tensile strength of the bar material test piece is arranged in each reducing jaw.
The beneficial effect of this scheme is:
when experimental, keep silent the reducing of two holders and wrap up in a tip department of bar test piece, wrap up at another tip department of bar test piece and use the holder equally, make the tip of bar test piece spacing on the reducing conical surface of two holders, increase the friction surface of bar test piece and anchor clamps, prevent the problem that produces the skid among the tensile test process, avoid the bar test piece to shift a small amount in the testing process and arouse that the test curve appears shaking the phenomenon.
Further, the holder includes spacing first spacing section to the testing machine and sets up the spacing section of second that the reducing was kept silent, first spacing section and the spacing section integrated into one piece of second and appearance are T shape.
The beneficial effects are that: the cooperation setting of first spacing section and the spacing section of second can let the holder spacing on the testing machine steadily in the testing process, improves the stability in the testing process.
Further, the two axial side surfaces of the first limiting section are inclined to the surface of the second limiting section according to a preset angle, and the preset angle is 75 degrees.
The beneficial effects are that: the first spacing section is arranged, so that the bearing capacity can be better, and the breakage of the first spacing section in the bearing process is reduced.
Furthermore, the radius of the large end of the reducing jaw is 10.5cm, and the radius of the small end of the reducing jaw is 7.5cm-7.6cm.
The beneficial effects are that: through the setting to the reducing size of keeping silent, can let the reducing keep silent and be suitable for the bar test piece of multiple size, application scope is bigger, reduces the number of times of changing the holder.
Furthermore, the reducing conical surface is positioned at one quarter of the end surface of one side of the reducing jaw, and the reducing conical surface is an arc surface with the radius of 10 cm.
The beneficial effects are that: the position of the reducing conical surface ensures the rapidity of the installation of the bar test piece, the radius of the reducing conical surface can adapt to the increase of friction area of various bar test pieces, and the stability of clamping is improved.
Further, the height of the tapered surface in the axial direction is 5cm.
The beneficial effects are that: the height setting of reducing conical surface can the stable stay bar test piece.
Furthermore, two magnets are fixedly arranged in the clamping pieceThe magnet blocks are respectively positioned at two sides of the tapered surface, and the volume of the magnet blocks is less than 9mm 3 。
The beneficial effects are that: through setting up the magnet piece that the volume is less, can increase the accuracy and the speed of bar test piece installation and two holder docks under the prerequisite that does not increase too big magnetic force and arouse the interference.
Drawings
Fig. 1 is a longitudinal sectional view of a first embodiment of a bar tensile sample clamp according to the present invention;
fig. 2 is a top view of the first embodiment of the bar tensile specimen clamp of the present invention, in which two clamping members are aligned with each other after assembly;
fig. 3 is a front view of the bar tensile sample clamp according to the first embodiment of the present invention when a bar test piece is clamped by a clamping member;
fig. 4 is a longitudinal sectional view of a bar tensile sample clamp according to a first embodiment of the present invention when a clamping member clamps a bar test piece;
fig. 5 is a schematic view of the conventional clamp for clamping a bar specimen.
Detailed Description
The following is a more detailed description of the present invention by way of specific embodiments.
Reference numerals in the drawings of the specification include: the device comprises a first limiting section 1, a second limiting section 2, a reducing jaw 3, a reducing conical surface 4, a bar test piece 5 and a flat jaw clamp 6.
Example one
As shown in fig. 1 and 2, bar tensile sample anchor clamps, including two holders that can install to the testing machine, the holder includes spacing first spacing section 1 to the testing machine and the spacing section 2 of second that sets up reducing keeping silent 3, first spacing section 1 and the spacing section 2 integrated into one piece of second and appearance are the T shape, first spacing section 1 is located axial two sides and inclines in the surface setting of the spacing section 2 of second according to preset angle, preset angle is 75, first spacing section 1 is the isosceles trapezoid body, the top surface of first spacing section 1 and the spacing section 2 integrated into one piece contact of second.
All seted up reducing on the holder and kept in touch 3, reducing is kept in touch 3 promptly and is located spacing section 2 of second, and the reducing of two holders is kept in touch 3 and is just forming the centre gripping passageway after the equipment, and the radial cross-section of centre gripping passageway is circular.
A reducing conical surface 4 for bearing the tensile strength of the bar test piece 5 is integrally arranged in the reducing jaw 3, the reducing conical surface 4 is equivalent to a step-shaped accommodating channel, namely, the clamping channel comprises a large end and a small end which are communicated with each other, the large end and the small end are transited through the reducing conical surface 4, the reducing conical surface 4 is positioned at one quarter of the end surface of one side of the reducing jaw 3, the radius of the large end of the reducing jaw 3 is 10.5cm, and the radius of the small end of the reducing jaw 3 is 7.5cm-7.6cm; the diameter-variable conical surface 4 is a cambered surface with the radius of 10cm, and the height of the diameter-variable conical surface 4 in the axial direction is 5cm.
The specific implementation process is as follows:
as shown in fig. 3 and 4, during the experiment, the reducing clamp mouth 3 of two clamping pieces wraps up in one end of bar test piece 5, and another end of bar test piece 5 also uses the clamping piece to wrap up, and the experiment all needs four clamping pieces at every turn promptly, and four clamping pieces are a set of for the end of bar test piece 5 is by spacing on the reducing conical surface 4 of two clamping pieces. Compared to the prior art flat-jaw clamp 6 shown in figure 5.
Aiming at the problem of the shaking-off of a test curve, in the process of early research and development, aiming at a clamp with a flat jaw, the displacement is prevented by continuously increasing the clamping force, and the problem that the clamping force is increased to the maximum and cannot be realized exists; the length of the clamping end of the test piece is improved, so that a series of process improvements are needed, and the problem that the test piece cannot be pushed forward exists; the problems of large loss and complicated clamp replacement process are also caused by increasing the replacement frequency of the clamp; still through setting anchor clamps into an integral type, there is the variety of bar test piece, and anchor clamps are changed very inconvenient problem. The anchor clamps of this embodiment can increase the friction surface of bar test piece 5 and anchor clamps when centre gripping bar test piece 5 is tested, prevents to produce the problem of skidding among the tensile test process, avoids bar test piece 5 to shift a small amount in the test process and arouses the test curve phenomenon of trembling to appear.
Due to the fact that the universality of the clamp for clamping bars with different structures is considered, the existing flat jaw clamp can meet the requirement of a tensile test, namely a stress-strain test curve of the bar in the process of stretching to failure is obtained, and the stress-strain test curve can be subjected to the shaking-off phenomenon after the flat jaw clamp is used for a period of time, so that the shaking-off phenomenon can be tolerated by most technicians. However, in the research process of the technical scheme of the embodiment, it is found that the shaking-off phenomenon in the stress-strain test curve cannot accurately represent the performance of the bar in the tensile test, and the shaking-off phenomenon of the test curve caused by the micro displacement in the tensile test process of the clamp can be prevented by the structural design of the clamp and the setting of relevant parameters of the clamp.
Example two
The bar tensile sample clamp is different from the first embodiment in that two magnet blocks are embedded in each clamping piece, the magnet blocks are respectively positioned at two sides of the tapered conical surface 4, namely the magnet blocks are respectively positioned at the positions opposite to the mutual contact surfaces of the clamping pieces during assembly, the magnet blocks are cubic or spherical, and the volume of the magnet blocks is less than 9mm 3 。
Before the experiment, through the magnet piece in the holder, can carry out preliminary absorption spacing behind centre gripping bar test piece 5, can also carry out the location of aiming at to two holders, improve the accuracy and the speed of the installation of bar test piece 5 and two holders butt joints. The magnet block has small volume and small action range of magnetic force, and cannot cause interference.
The big more its magnetic adsorption of current magnet piece is big, also more convenient location is used, for example to the position that needs magnetic adsorption, generally uses the complete coverage mode, is rectangular form or annular with the magnet piece setting, such setting up occupation space relatively, the magnet piece setting of this embodiment is less to the influence that overall structure used the alignment, does not influence the operation that opens and shuts between two holders, can have sufficient power to fix a position again.
The above description is only an example of the present invention, and the common general knowledge of the known specific structures and characteristics of the embodiments is not described herein. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements 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. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (7)
1. The bar tensile sample clamp comprises two clamping pieces which can be arranged on the testing machine; the method is characterized in that:
the clamping piece is provided with reducing jaws, the reducing jaws of the clamping piece are opposite to form a clamping channel after assembly, the radial cross section of the clamping channel is circular, and a reducing conical surface used for bearing the tensile strength of the bar test piece is arranged in the reducing jaws.
2. The bar tensile specimen clamp of claim 1, wherein: the holder includes spacing first spacing section to on the testing machine and sets up the spacing section of second that the reducing was kept silent, first spacing section and the spacing section integrated into one piece of second and appearance are T shape.
3. The bar tensile specimen clamp of claim 2, wherein: the first limiting section is arranged on two axial side surfaces and inclines to the surface of the second limiting section according to a preset angle, and the preset angle is 75 degrees.
4. A bar tensile specimen clamp as defined in claim 3, wherein: the radius of the large end of the reducing jaw is 10.5cm, and the radius of the small end of the reducing jaw is 7.5cm-7.6cm.
5. The bar tensile specimen clamp of claim 4, wherein: the reducing conical surface is positioned at one quarter of the end surface of one side of the reducing jaw, and the reducing conical surface is an arc surface with the radius of 10 cm.
6. The bar tensile specimen clamp of claim 5, wherein: the height of the reducing conical surface in the axial direction is 5cm.
7. The bar tensile specimen clamp of claim 5, wherein: two magnet blocks are fixedly arranged in the clamping piece, the magnet blocks are respectively positioned at two sides of the tapered surface, and the volume of each magnet block is smaller than 9mm 3 。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222324277.2U CN218382047U (en) | 2022-08-31 | 2022-08-31 | Bar tensile sample clamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222324277.2U CN218382047U (en) | 2022-08-31 | 2022-08-31 | Bar tensile sample clamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218382047U true CN218382047U (en) | 2023-01-24 |
Family
ID=84972158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222324277.2U Active CN218382047U (en) | 2022-08-31 | 2022-08-31 | Bar tensile sample clamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218382047U (en) |
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2022
- 2022-08-31 CN CN202222324277.2U patent/CN218382047U/en active Active
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