CN218956258U - Clamp suitable for tensile test of dumbbell-shaped test piece - Google Patents
Clamp suitable for tensile test of dumbbell-shaped test piece Download PDFInfo
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- CN218956258U CN218956258U CN202320055112.1U CN202320055112U CN218956258U CN 218956258 U CN218956258 U CN 218956258U CN 202320055112 U CN202320055112 U CN 202320055112U CN 218956258 U CN218956258 U CN 218956258U
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Abstract
The utility model relates to the technical field of tensile testing machine clamps, and particularly discloses a clamp suitable for tensile testing of a dumbbell-shaped test piece, which comprises: the device comprises an upper chuck, a lower chuck, a positioning rod, a locking piece and a base plate. The upper clamping head and the lower clamping head are groove-shaped members formed by bending two ends of the plate body by 90 degrees, and the grooves of the upper clamping head are opposite to the grooves of the lower clamping head in use. The side wall of the upper chuck is provided with first through holes which are symmetrically distributed left and right, the positioning rod passes through the first through holes and then is connected with the locking piece, the side wall of the lower chuck is provided with second through holes which are symmetrically distributed left and right, and the other positioning rod passes through the second through holes and then is connected with the other locking piece. The locating rod is located on the inclined plane of the isosceles trapezoid end portion of the dumbbell-shaped test piece, and the base plate is clamped between the locating rod and the inclined plane of the end portion. The fixture can effectively improve test efficiency, can ensure that the component breaks in the measurement gauge length, and improves test efficiency and reliability.
Description
Technical Field
The utility model relates to the technical field of clamps of tensile testing machines, in particular to a clamp suitable for tensile testing of dumbbell-shaped test pieces.
Background
The tensile strength of a member of ordinary concrete, ultra-light high-strength and ultra-high-performance concrete or other materials is mainly tested by a tensile testing machine, two ends of the member are usually clamped by a clamp of the testing machine during testing, a test piece is in an axial tensile state, and then the tensile force is transmitted to the member for testing by stretching from the two ends of the member. For example, chinese patent document with the grant number CN211955007U discloses a novel concrete axial tensile test device, wherein both ends of a tensile concrete specimen are clamped in a pull head; the upper cross beam and the lower cross beam are provided with pull rods at positions corresponding to the axes of the pull heads, one ends of the pull rods are connected with the fixed pull heads, the other ends of the pull rods are connected with the spherical hinge assemblies, and the axes of the pull heads and the pull rods are coincident; the spherical hinge component is connected with the universal testing machine through the connecting round steel. The device can better ensure that the axle center is pulled, better meet the test requirements of rigidity and test precision, solve the problem of insufficient rigidity of the existing high-precision universal testing machine, and further accurately test the stress-strain curve after the peak strength of the concrete test piece. The existing clamps of many tensile testing machines on the market are difficult to ensure that the components break in the measuring scale distance, the damage of a test piece is not in a controllable testing range, and the efficiency and the reliability of the test are affected; in addition, the defects of complex tensile load transmission mode, complex device assembly and the like exist.
Disclosure of Invention
The utility model provides a clamp suitable for tensile testing of a dumbbell-shaped test piece, which has the characteristics of simplicity in operation, easiness in assembly, disassembly and the like, can effectively improve the test efficiency, can ensure that a component breaks in a measuring gauge length, and improves the test efficiency and reliability. In order to achieve the above purpose, the technical scheme of the utility model is as follows:
a clamp suitable for tensile testing of dumbbell-shaped test pieces, comprising: the device comprises an upper chuck, a lower chuck, a positioning rod, a locking piece and a base plate. Wherein: the upper clamping head and the lower clamping head are groove-shaped members formed by bending two ends of the plate body by 90 degrees, and the grooves of the upper clamping head are opposite to the grooves of the lower clamping head in use. The side wall of the upper chuck is provided with first through holes which are symmetrically distributed left and right, the positioning rod passes through the first through holes and then is connected with the locking piece, the side wall of the lower chuck is provided with second through holes which are symmetrically distributed left and right, and the other positioning rod passes through the second through holes and then is connected with the other locking piece. When the dumbbell type test piece is used, two ends of the isosceles trapezoid of the dumbbell type test piece are respectively located in the grooves of the upper clamping head and the grooves of the lower clamping head, the locating rod is located on the inclined plane of the end part of the isosceles trapezoid of the dumbbell type test piece, and the base plate is clamped between the locating rod and the inclined plane of the end part.
Further, the positioning rod is a screw rod, the locking piece is a nut, and one end of the positioning rod passes through the through hole and is in threaded connection with the nut.
Further, the first through hole is composed of four through holes, which are respectively distributed on four corners of the isosceles trapezoid.
Further, the second through holes are composed of four through holes, which are respectively distributed on four corners of the isosceles trapezoid.
Further, the top surface of the upper chuck is provided with an upper connecting piece which is used for being connected with a telescopic component of the tensile testing machine.
Further, the top surface of the lower chuck is provided with a lower connecting piece which is used for fixing the lower chuck on the tensile testing machine.
Further, the upper connecting piece and the lower connecting piece are screw rods, and the upper connecting piece and the lower connecting piece are in threaded connection with the corresponding clamping heads.
Compared with the prior art, the utility model has the following beneficial effects:
(1) The clamp suitable for the tensile test of the dumbbell-shaped test piece provided by the utility model has the advantages that the upper clamping head and the lower clamping head formed by the groove-shaped members formed after the two ends of the plate body are bent for 90 degrees are adopted to respectively accommodate the upper end and the lower end of the dumbbell-shaped test piece, and then the positioning rod and the locking piece are adopted to detachably fix the end part of the test piece from the inclined side wall of the test piece, so that the members and the clamping heads can be rapidly positioned and centered, the operation is flexible and simple, the disassembly is easy, and the test efficiency is effectively improved.
(2) The clamp suitable for the tension test of the dumbbell-shaped test piece is provided with the base plate between the positioning rod and the test piece, so that the problem that the positioning rod and the test piece are not easy to attach well is solved, the extrusion force transmitted by the positioning rod during stretching can be more uniformly dispersed on the side surface of the test piece through the base plate, the problem that the test piece is broken from the position due to stress concentration when the extrusion force is directly transmitted to the test piece through the positioning rod is avoided, and the tension breaking position of the test piece is better controlled within a measurement gauge length, and the accuracy and the reliability of a test experiment are improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model.
Fig. 1 is a schematic structural view of a clamp suitable for a tensile test of a dumbbell-shaped test piece in the following embodiment.
Fig. 2 is a schematic structural view of the upper chuck and the lower chuck in the following embodiments.
Fig. 3 is a schematic view showing the structure of the positioning rod and the backing plate in the following embodiments.
The label marks in the figures represent: 1-upper chuck, 2-lower chuck, 3-locating lever, 4-retaining member, 5-backing plate, 6-dumbbell test piece, 7-upper connecting piece, 8-lower connecting piece, 101-first through-hole, 201-second through-hole.
Detailed Description
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the utility model. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs.
For convenience of description, the words "upper", "lower", "left" and "right" in the present utility model, if they mean only that the directions are consistent with the upper, lower, left, and right directions of the drawings per se, and do not limit the structure, only for convenience of description and simplification of the description, but do not indicate or imply that the apparatus or element to be referred to needs to have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Term interpretation section: the terms "mounted," "connected," "secured," and the like in the present utility model are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the terms are used in the present utility model to be understood in a specific sense by those skilled in the art according to the specific circumstances, and they may be mechanically connected, directly connected, or indirectly connected through an intermediate medium. The technical scheme of the utility model is further described with reference to the specification, the drawings and the specific embodiments.
Referring to fig. 1, 2 and 3, an example of a clamp suitable for a dumbbell specimen tensile test includes: the clamping device comprises an upper clamping head 1, a lower clamping head 2, a positioning rod 3, a locking piece 4 and a base plate 5. Wherein:
the upper clamping head 1 and the lower clamping head 2 are groove-shaped members formed by bending two ends of a plate body by 90 degrees, and when the dumbbell type test piece is used, the upper clamping head 1 is located right above the lower clamping head 2, and the grooves of the upper clamping head 1 are opposite to the grooves of the lower clamping head 2, so that the upper end and the lower end of the dumbbell type test piece 6 are placed in the grooves of the upper clamping head 1 and the grooves of the lower clamping head 2 respectively for positioning. It should be noted that, referring to fig. 1, the upper end and the lower end of the dumbbell-shaped test piece 6 are symmetrically distributed isosceles trapezoid blocks, a measurement gauge length is provided between the two ends, and when a tensile experiment is performed, the fracture position/fracture surface of the member should be controlled within the measurement gauge length, so that the test is effective.
The front wall surface of the upper chuck 1 is provided with first through holes 101 which are symmetrically distributed left and right, and the rear wall surface of the upper chuck 1 is provided with through holes corresponding to the first through holes 101. Similarly, the front wall surface of the lower chuck 2 is provided with second through holes 201 which are symmetrically distributed in left and right directions, the rear wall surface of the lower chuck 2 is provided with through holes corresponding to the second through holes 201, and the first through holes 101 and the second through holes 201 are positioned at inclined surfaces of the isosceles trapezoid ends of the dumbbell-shaped test piece 6. The first through hole 101 and the second through hole 201 are vertically symmetrically distributed.
The first through hole 101 and the second through hole 201 are both used for fixing the upper end and the lower end of the dumbbell-shaped test piece 6 after the positioning rod 3 penetrates, so that the dumbbell-shaped test piece is connected with the upper chuck 1 and the lower chuck 2 into a whole. Specifically, when testing is performed, the upper end and the lower end of the dumbbell-shaped test piece 6 are respectively placed in the groove of the upper chuck 1 and the groove of the lower chuck 2, then the positioning rod 3 passes through the first through hole 101 on the front wall surface of the upper chuck 1 and the corresponding through hole on the rear wall surface, the two ends of the positioning rod 3 are screw rods, the locking piece 4 is a nut, then the two ends of the positioning rod 3 are connected with the nut in a threaded manner and are fastened, the positioning rod 3 is fixed on the upper chuck 1, at this time, the positioning rod 3 is located at the inclined plane of the upper end of the isosceles trapezoid shape of the dumbbell-shaped test piece 6, so that the upper end of the dumbbell-shaped test piece 6 is fixed in the groove of the upper chuck 1, and the upper end of the dumbbell-shaped test piece 6 can be prevented from being separated from the upper chuck 1 when a tensile test is performed. The lower end of the dumbbell-shaped test piece 6 is fixed in the groove of the lower chuck 2 in the same manner. In the embodiment, the upper clamping head 1 and the lower clamping head 2 formed by the groove-shaped members formed after the two ends of the plate body are bent by 90 degrees are respectively used for accommodating the upper end and the lower end of the dumbbell-shaped test piece 6, and then the positioning rod 3 and the locking piece 4 are used for detachably fixing the end part of the test piece from the inclined side wall of the test piece, so that the members and the clamping heads can be rapidly positioned and centered, the operation is flexible and simple, the disassembly is easy, and the test efficiency is effectively improved.
Further, in this embodiment, a steel backing plate 5 is further disposed between the positioning rod 3 and the inclined plane of the end portion of the dumbbell-shaped test piece 6, when the positioning rod is disposed, the upper end and the lower end of the dumbbell-shaped test piece 6 are respectively placed in the groove of the upper chuck 1 and the groove of the lower chuck 2, then the backing plate 5 is attached to the inclined plane of the end portion of the dumbbell-shaped test piece 6, and penetrates into the positioning rod 3 to fix. Through set up backing plate 5 between locating lever 3 and the test piece, not only be favorable to overcoming the difficult problem of laminating well of locating lever 3 and test piece, the extrusion force that is passed by locating lever 3 when can will stretching passes through backing plate 5 more evenly to be dispersed on the test piece side moreover, avoids directly causing stress concentration and makes the cracked problem of test piece follow this place when passing through locating lever 3 to test piece extrusion force easily to control the cracked position of test piece tensioning in measuring the gauge length better, improve the accuracy and the reliability of test experiment.
With continued reference to fig. 1-3, in a further embodiment, the first through hole 101 is comprised of four through holes, each of which is distributed over four corners of an isosceles trapezoid. Likewise, the second through holes 201 are formed by four through holes, which are respectively distributed on four corners of the isosceles trapezoid, so that not only the connection between the dumbbell-shaped test piece 6 and the clamping head is firmer, but also the transmission and distribution of the tensile acting force/load can be more uniformly carried out, the tensile fracture position of the test piece is better controlled within the measurement scale distance, and the accuracy and reliability of the test experiment are improved
With continued reference to fig. 1-3, in a further embodiment, the upper jaw 1 has an upper connector 7 on its top surface for connection with a telescoping component of a tensile testing machine. The lower jaw 2 has a lower connector 8 on its top surface for securing the lower jaw 2 to a tensile testing machine. Specifically, the upper connecting piece 7 and the lower connecting piece are screw rods, and are connected to the corresponding clamping heads through bolt fastening, so that the disassembly and assembly are convenient.
Finally, it should be noted that any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. While the foregoing description of the embodiments of the present utility model has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the utility model, but rather, it is intended to cover all modifications or variations within the scope of the utility model as defined by the claims of the present utility model.
Claims (7)
1. A clamp suitable for tensile testing of a dumbbell-shaped test piece, comprising: the device comprises an upper chuck, a lower chuck, a positioning rod, a locking piece and a base plate; wherein: the upper clamping head and the lower clamping head are groove-shaped members formed by bending two ends of the plate body by 90 degrees, and the grooves of the upper clamping head are opposite to the grooves of the lower clamping head when the clamping head is used; the side wall of the upper chuck is provided with first through holes which are symmetrically distributed left and right, the positioning rod passes through the first through holes and then is connected with the locking piece, the side wall of the lower chuck is provided with second through holes which are symmetrically distributed left and right, and the other positioning rods pass through the second through holes and then are connected with the other locking pieces;
in use, the clamp has the following condition: the two ends of the isosceles trapezoid of the dumbbell-shaped test piece are respectively positioned in the grooves of the upper clamping head and the grooves of the lower clamping head, the positioning rod is positioned on the inclined plane of the end part of the isosceles trapezoid of the dumbbell-shaped test piece, and the base plate is clamped between the positioning rod and the inclined plane of the end part.
2. The clamp for tensile testing of a dumbbell-shaped test piece according to claim 1, wherein the positioning rod is a screw rod, the locking member is a nut, and one end of the positioning rod passes through the through hole and is in threaded connection with the nut.
3. The clamp for tensile testing of a dumbbell-shaped test piece according to claim 1, wherein the first through holes are composed of four through holes, which are respectively distributed on four corners of an isosceles trapezoid.
4. The clamp for tensile testing of a dumbbell-shaped test piece according to claim 1, wherein the second through holes are composed of four through holes, which are respectively distributed on four corners of an isosceles trapezoid.
5. The clamp for tensile testing of a dumbbell-shaped test piece of any one of claims 1 to 4, wherein the upper clamp head has an upper connector on a top surface thereof.
6. The clamp for tensile testing of a dumbbell-shaped test piece of claim 5, wherein the lower clamp head has a lower connector on a top surface thereof.
7. The clamp for tensile testing of a dumbbell-shaped test piece of claim 6, wherein the upper and lower connecting members are threaded rods that are threadedly connected with the corresponding clamps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320055112.1U CN218956258U (en) | 2023-01-09 | 2023-01-09 | Clamp suitable for tensile test of dumbbell-shaped test piece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320055112.1U CN218956258U (en) | 2023-01-09 | 2023-01-09 | Clamp suitable for tensile test of dumbbell-shaped test piece |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218956258U true CN218956258U (en) | 2023-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320055112.1U Active CN218956258U (en) | 2023-01-09 | 2023-01-09 | Clamp suitable for tensile test of dumbbell-shaped test piece |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218956258U (en) |
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2023
- 2023-01-09 CN CN202320055112.1U patent/CN218956258U/en active Active
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