CN203643262U - Direct rock tension testing device loaded by electromagnetic force - Google Patents
Direct rock tension testing device loaded by electromagnetic force Download PDFInfo
- Publication number
- CN203643262U CN203643262U CN201320829642.3U CN201320829642U CN203643262U CN 203643262 U CN203643262 U CN 203643262U CN 201320829642 U CN201320829642 U CN 201320829642U CN 203643262 U CN203643262 U CN 203643262U
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- pull head
- test specimen
- electromagnetic force
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- rocks
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Abstract
The utility model discloses a direct rock tension testing device loaded by electromagnetic force, and relates to the technical field of rock mechanics tests. A round hole for connecting a fixing tension end is formed in the center of a base of the testing device; a test piece is arranged at the upper end of the fixing tension end; a moving tension end is arranged at the upper end of the test piece; springs are oppositely arranged at the upper part of the moving tension end; the upper ends of the springs are fixed on the lower end surface of a fixing box; a bracket is arranged between the fixing box and the base; an electromagnet with a lead is arranged inside the fixing box; the electromagnet is connected with a controllable power supply and an ammeter respectively through leads. To overcome the defects in the prior art, the testing device is simple in construction and convenient to operate, and solves the problems that the test piece is hard to manufacture, the stress generated in clamping is centralized and bending moment can be generated because of eccentricity after loading in the direct rock tension testing.
Description
Technical field
The utility model relates to a kind of rocks in direct tension test unit, especially relates to a kind of rocks in direct tension test unit that utilizes electromagnetic force to load, and belongs to rock mechanics experiment technical field.
Background technology
The tensile strength of rock is that rock sample is resisted the limit capacity of destroying under the effect of single shaft pulling force, or ultimate strength, and it is numerically equal to the maximum tension stress while destruction.Compare with the compressive strength of rock, the research of tensile strength is fewer.At present, in rock mechanics experiment technical field, the method for measuring Tensile Strength of Rock mainly contains direct pulling method and split the law (also claiming Brazilian test method).
The problem that the direct tensile test method of rock exists has: (1) test specimen problem: in test, adopt comparatively special dumbbell shaped test specimen, and unconventional right cylinder or square test specimen, test material preparation difficulty.(2) near clamping problem: generally rock sample is arranged in clamper, makes in process of the test easily damage test specimen and have stress concentration phenomenon bearing.(3) load eccentricity issues: in loading, testing machine axis and test specimen axis are difficult to accurate centering, inevitably produce bending moment in test specimen both ends of the surface.Rock is carried out to direct tensile test more difficult, much more existing adopt diametral compression tests, then calculate tensile strength by theoretical formula, but there is difference in the definite intensity of the tensile strength of trying to achieve by diametral compression test and direct tensile test.
Therefore, existing rocks in direct tension test unit is further improved.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the purpose of this utility model has been to provide a kind of rocks in direct tension test unit that utilizes electromagnetic force to load, this device simple structure, easy to operate, has solved the test material preparation difficulty, the use clamping generation stress that in rocks in direct tension test, exist and has concentrated, loaded the rear problem that exists bias to produce bending moment.
For achieving the above object, the technical solution of the utility model is:
A kind of rocks in direct tension test unit that utilizes electromagnetic force to load, comprise base, fixing pull head, test specimen, mobile pull head, spring, controllable electric power, reometer, wire, electromagnet, fixed case, support, the circular hole for being connected and fixed pull head is offered at the center of base, the upper end of fixing pull head arranges test specimen, the upper end of test specimen arranges mobile pull head, the top of mobile pull head is oppositely arranged spring, and the upper end of spring is fixed on the lower surface of fixed case, between fixed case and base, support is set; In fixed case, arrange the electromagnet with wire, electromagnet is connected with controllable electric power, reometer respectively by wire.
Reasonable, between fixing pull head of the present utility model and base, screw thread is fixedly connected with.
Reasonable, gluing connection between fixing pull head of the present utility model, mobile pull head and test specimen.
Reasonablely be, fixing pull head of the present utility model is made up of three parts, bottom is the part that shape of threads is connected with base, middle part is that cross section is regular hexagon and the size cylinder more bigger than test specimen, conveniently tighten fixing pull head, top is the right cylinder cushion cap that a cross section and test specimen match, and the upper surface of right cylinder cushion cap is connected with test specimen is gluing.
Reasonable, spring of the present utility model is made up of copper cash.
Reasonable, support of the present utility model Height Adjustable.
The utility model adopts technique scheme, and compared with prior art tool has the following advantages:
(1) the utility model adopts right cylinder rock sample, has avoided the shortcoming of traditional direct tensile test sample preparation difficulty, has reduced experimentation cost.
(2) the utility model is owing to adopting electromagnetic force to load stretching, and test specimen does not need fixture clamping, makes can not damage test specimen in test, has avoided the generation of stress concentration phenomenon and bending moment.
(3) between test specimen of the present utility model and pull head, adopt JGN type building structure glue bond, tensile strength >=33Mpa, meets the requirement of strength of rock tension test, and operation is simple.
(4) the utility model utilizes electromagnetic force to carry out direct tensile test to rock sample, compare the Tensile Strength of Rock that diametral compression test tries to achieve more accurate, and test operation is simple, easy to loading and unloading.
Brief description of the drawings
Fig. 1 is a kind of structural representation of the present utility model.
Wherein: 1, base; 2, fixing pull head; 3, test specimen; 4, mobile pull head; 5, spring; 6, controllable electric power; 7, reometer; 8, wire; 9, electromagnet; 10, fixed case; 11, support.
Embodiment
Below in conjunction with accompanying drawing, the technical solution of the utility model is elaborated:
As shown in Figure 1, a kind of rocks in direct tension test unit that utilizes electromagnetic force to load, comprise base 1, fixing pull head 2, test specimen 3, mobile pull head 4, spring 5, controllable electric power 6, reometer 7, wire 8, electromagnet 9, fixed case 10, support 11, the circular hole for being connected and fixed pull head 2 is offered at the center of base 1, the upper end of fixing pull head 2 arranges test specimen 3, the upper end of test specimen 3 arranges mobile pull head 4, the top of mobile pull head 4 is oppositely arranged spring 5, the upper end of spring 5 is fixed on the lower surface of fixed case 10, between fixed case 10 and base 1, support 11 is set; The electromagnet 9 of the interior layout of fixed case 10 with wire 8, electromagnet 9 is connected with controllable electric power 6, reometer 7 respectively by wire 8.
As shown in Figure 1, between fixing pull head 2 of the present utility model and base 1, screw thread is fixedly connected with, fixing pull head 2 is made up of three parts, bottom is the part that shape of threads is connected with base, middle part is that cross section is regular hexagon and the size cylinder more bigger than test specimen, conveniently tighten fixing pull head, top is the right cylinder cushion cap that a cross section and test specimen 3 match, and the upper surface of right cylinder cushion cap is connected with test specimen 3 is gluing.Fixing pull head 2 lower ends are threaded, and convenient and base loads and unloads.Glue bond between fixing pull head 2 of the present utility model, mobile pull head 4 and test specimen 3.Mobile pull head 4 of the present utility model is made up of ordinary steel iron, makes can be subject to magneticaction after electromagnet 9 energisings, and mobile pull head is right cylinder, and cross-sectional sizes is consistent with test specimen upper surface.
The inner iron core of the utility model electromagnet 9 is right cylinder, changes the electromotive force size of controllable electric power with given pace, makes the electric current that changes in electromagnet, and the magnetic force of formation and modification moves to bottom the test specimen that pull head connects and stretches.
The utility model support 11 Height Adjustable.
As shown in Figure 1, the rocks in direct tension test unit that utilizes electromagnetic force to load described in the utility model, base 1 is rectangular parallelepiped, is of a size of 500mm × 400mm × 200mm, center has shape of threads circular hole, is connected with fixing pull head 2 lower ends.Consider the convenience of operation while connection with base, the cross section, middle part of fixing pull head 2 is made into regular hexagon, and it is bigger to meet Area Ratio test specimen.Test specimen to be measured 3 two ends are fixed between fixing pull head 2, mobile pull head 4 by high-strength adhesive glue, mobile pull head 4 is bottom surface and test specimen right cylinder of the same size, it is highly 30mm, fitting completely in the upper surface of the lower surface of mobile pull head 4 and test specimen 3, makes the electromagnetic force producing evenly be applied to test specimen end face.Support 11 is adjustable support, regulates the distance between fixed case 10 and base 1 according to the height of test specimen 3, and making the upper surface of mobile pull head 4 and the distance of fixed case 10 bottoms is 50mm.The electromotive force size that regulates controllable electric power 6 by given pace, makes to produce magnetic field in electromagnet 9 by wire 8, thereby makes mobile pull head 4 because being subject to upwards tensile test specimen 3 of electromagnetic force.In the time of test specimen 3 tensile failure, for preventing that mobile pull head 4 from clashing into electromagnet 9, be provided with thin and close copper wire spring in the bottom of fixed case 10.
Slowly change the electromotive force size of controllable electric power 6, until test specimen 3 fail in tensions.When being pulled off, test specimen records the current indication in reometer 7.By electromagnetics principle, obtain maximum pull computing formula and be:
In formula: μ
0-permeability of vacuum (H/m);
N-coil turn;
I-coil current (A);
A-test specimen cross-sectional area (m
2)
The space distance (m) of x-mobile pull head and electromagnet bottom.
The maximum pull obtaining when test specimen is pulled off is the tensile strength of rock divided by test specimen cross-sectional area, that is:
In formula: σ
t-tensile strength (Pa);
F-maximum pull (N);
A-test specimen cross-sectional area (m
2).
Claims (6)
1. a rocks in direct tension test unit that utilizes electromagnetic force to load, it is characterized in that comprising base (1), fixing pull head (2), test specimen (3), mobile pull head (4), spring (5), controllable electric power (6), reometer (7), wire (8), electromagnet (9), fixed case (10), support (11), the circular hole for being connected and fixed pull head (2) is offered at the center of base (1), the upper end of fixing pull head (2) arranges test specimen (3), the upper end of test specimen (3) arranges mobile pull head (4), the top of mobile pull head (4) is oppositely arranged spring (5), the upper end of spring (5) is fixed on the lower surface of fixed case (10), between fixed case (10) and base (1), support (11) is set, the electromagnet (9) of arranging band wire (8) in fixed case (10), electromagnet (9) is connected with controllable electric power (6), reometer (7) respectively by wire (8).
2. the rocks in direct tension test unit that utilizes electromagnetic force to load according to claim 1, is characterized in that between above-mentioned fixing pull head (2) and base (1), screw thread is fixedly connected with.
3. the rocks in direct tension test unit that utilizes electromagnetic force to load according to claim 1, is characterized in that gluing connection between above-mentioned fixing pull head (2), mobile pull head (4) and test specimen (3).
4. according to the rocks in direct tension test unit that utilizes electromagnetic force to load described in claim 2 or 3, it is characterized in that above-mentioned fixing pull head (2) is made up of three parts, bottom is the part that shape of threads is connected with base, middle part is that cross section is regular hexagon and the size cylinder more bigger than test specimen, conveniently tighten fixing pull head, top is the right cylinder cushion cap that a cross section and test specimen (3) match, the upper surface of right cylinder cushion cap and gluing connection of test specimen (3).
5. the rocks in direct tension test unit that utilizes electromagnetic force to load according to claim 1, is characterized in that above-mentioned spring (5) is made up of copper cash.
6. the rocks in direct tension test unit that utilizes electromagnetic force to load according to claim 1, is characterized in that the Height Adjustable of above-mentioned support (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320829642.3U CN203643262U (en) | 2013-12-16 | 2013-12-16 | Direct rock tension testing device loaded by electromagnetic force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320829642.3U CN203643262U (en) | 2013-12-16 | 2013-12-16 | Direct rock tension testing device loaded by electromagnetic force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203643262U true CN203643262U (en) | 2014-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320829642.3U Expired - Fee Related CN203643262U (en) | 2013-12-16 | 2013-12-16 | Direct rock tension testing device loaded by electromagnetic force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203643262U (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043620A (en) * | 2015-05-31 | 2015-11-11 | 叶露微 | Power meter for micro motor |
| CN105334109A (en) * | 2015-11-27 | 2016-02-17 | 中国矿业大学 | Test device for simulating complicated loads based on electromagnetic field, and test method using test device |
| CN106092739A (en) * | 2016-08-28 | 2016-11-09 | 兰州大学 | A kind of polytypic sample chuck for direct tensile test |
| CN106153450A (en) * | 2016-08-28 | 2016-11-23 | 兰州大学 | A kind of fixture with disposable connector |
| CN106153451A (en) * | 2016-08-28 | 2016-11-23 | 兰州大学 | A kind of convex shape fixture for direct tensile test |
| CN106546496A (en) * | 2017-01-23 | 2017-03-29 | 重庆科技学院 | The triaxial rheological experiment device of electromagnetism loading |
| CN108469379A (en) * | 2018-06-13 | 2018-08-31 | 三峡大学 | A kind of contactless Tensile Strength of Rock test device based on electromagnetic principle |
| CN109946179A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | A kind of electromagnetism force loading device and its method suitable for metal tube one directional tensile test |
| CN109946180A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | A kind of pulse force loading device and method suitable for metal tube one directional tensile test |
| CN111855432A (en) * | 2020-07-20 | 2020-10-30 | 华中科技大学 | Device and method for testing stress-strain curve of titanium alloy material under high-temperature high-strain rate |
-
2013
- 2013-12-16 CN CN201320829642.3U patent/CN203643262U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105043620A (en) * | 2015-05-31 | 2015-11-11 | 叶露微 | Power meter for micro motor |
| CN105334109A (en) * | 2015-11-27 | 2016-02-17 | 中国矿业大学 | Test device for simulating complicated loads based on electromagnetic field, and test method using test device |
| CN106092739A (en) * | 2016-08-28 | 2016-11-09 | 兰州大学 | A kind of polytypic sample chuck for direct tensile test |
| CN106153450A (en) * | 2016-08-28 | 2016-11-23 | 兰州大学 | A kind of fixture with disposable connector |
| CN106153451A (en) * | 2016-08-28 | 2016-11-23 | 兰州大学 | A kind of convex shape fixture for direct tensile test |
| CN106546496A (en) * | 2017-01-23 | 2017-03-29 | 重庆科技学院 | The triaxial rheological experiment device of electromagnetism loading |
| CN108469379A (en) * | 2018-06-13 | 2018-08-31 | 三峡大学 | A kind of contactless Tensile Strength of Rock test device based on electromagnetic principle |
| CN109946179A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | A kind of electromagnetism force loading device and its method suitable for metal tube one directional tensile test |
| CN109946180A (en) * | 2019-03-18 | 2019-06-28 | 三峡大学 | A kind of pulse force loading device and method suitable for metal tube one directional tensile test |
| CN111855432A (en) * | 2020-07-20 | 2020-10-30 | 华中科技大学 | Device and method for testing stress-strain curve of titanium alloy material under high-temperature high-strain rate |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20140611 Termination date: 20161216 |