CN207730551U - Test piece fixing device for true triaxial test - Google Patents
Test piece fixing device for true triaxial test Download PDFInfo
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- CN207730551U CN207730551U CN201721804554.2U CN201721804554U CN207730551U CN 207730551 U CN207730551 U CN 207730551U CN 201721804554 U CN201721804554 U CN 201721804554U CN 207730551 U CN207730551 U CN 207730551U
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Abstract
The utility model provides a kind of test piece fixing device for true triaxial test, includes the test specimen box for installing and fixing test specimen；The test specimen box includes box body, pressure head, last item and briquetting；The rectangular body structure of box body, the pressure head are set to the outside in each face of box body, and the briquetting is set to the inside in each face of box body；For the last item by the trepanning on each face of box body, one end connects pressure head, and the other end connects briquetting；The surface of the box body is fixed with the guide rod perpendicular to box surface, and the pressure head can be along the axial movement of the guide rod；The pre-tightening apparatus for pre-tightening test specimen is connected between the pressure head and box surface, the gap during preload between pressure head and box body is filled by cushion block.Test piece fixing device described in the utility model for true triaxial test solves the problems, such as that existing true triaxial test machine positioning part precision is not high, and then is conducive to reduce test error.
Description
Technical field
The utility model is related to material mechanical performance testing equipment fields, and it is true to be applied to rock in particular to one kind
The test piece fixing device of triaxial test.
Background technology
The true triaxial test of rock is to measure one with study of rocks deformation and strength characteristics under three-dimensional stress state
Kind experiment.For the true triaxial test machine of study of rocks true triaxial test and the research object of the most important thing.Especially in ground
Engineering field, true triaxial test machine carry grinding for stability of slope, tunnel surrounding maintenance, bump, earthquake sheet etc.
Study carefully the important task with engineer application.The precision of existing true triaxial test machine positioning test specimen is not high, the initial geometric center of test specimen with
Load center causes there are relatively large deviation during load, and the eccentric degree of load is higher, causes the rock sample of final gained
There are larger errors for intensity value.
Utility model content
The purpose of this utility model is to provide a kind of test piece fixing device for true triaxial test, the test specimen is fixed
Device can overcome the problems, such as that the precision of existing true triaxial test machine positioning test specimen is not high.
To achieve the goals above, the utility model provides following technical scheme：A kind of test specimen for true triaxial test
Fixing device includes the test specimen box for installing and fixing test specimen；The test specimen box includes box body, pressure head, last item and briquetting；Institute
The rectangular body structure of box body is stated, the pressure head is set to the outside in each face of box body, and the briquetting is set to the inside in each face of box body；
For the last item by the trepanning on each face of box body, one end connects pressure head, and the other end connects briquetting；The pressure head is for directly bearing
Vertical or horizontal addload, and pass sequentially through last item and load is passed to test specimen by briquetting；The briquetting is used to connect with test specimen extruding
It touches and fixes test specimen；
The surface of the box body is fixed with the guide rod perpendicular to box surface, and the pressure head can be moved along the axial direction of the guide rod
It is dynamic；The pre-tightening apparatus for pre-tightening test specimen is connected between the pressure head and box surface, during preload between pressure head and box body
Gap filled by cushion block.
The test piece fixing device for true triaxial test makes pressure head only along perpendicular to box body by the setting of guide rod
The direction on surface is moved, then the end face of briquetting and the surface of box body are parallel without deflection, and then ensure test specimen with respect to test specimen
Box not run-off the straight；By the setting of pre-tightening apparatus, pre-tightening apparatus is pre-tightened before loading, it is fixed using geomery during preload
Cushion block fills the gap between pressure head and box surface, then distance of the pressure head of six direction apart from box surface is controlled by cushion block
System, and then ensure that the geometric center of test specimen is overlapped with the geometric center of test specimen box.
The above-mentioned test piece fixing device for true triaxial test ensure that test specimen exists using guide rod, the first screw, cushion block etc.
Positioning accuracy in test specimen box.
Further, the test piece fixing device for true triaxial test further includes test specimen mounting bracket；The test specimen peace
It shelves and is used to support and fixes the test specimen box, levelling device is provided between the test specimen box and test specimen mounting bracket.Pass through tune
The setting of leveling device, the height error for compensating test specimen mounting bracket, and then ensure that test specimen box is in horizontality before load.
Preferably, the test specimen mounting bracket includes the four columns of base plate and square distribution, the bottom of the column
End is fixed on the base plate；
The test specimen box further includes the supporting rack having in criss-cross construction, and support frame as described above is fixedly arranged at box body
Four ends of bottom, support frame as described above are connect with the top of four columns respectively, and the levelling device is set to supporting rack
Between end and the top of column.But not limited to this, the structure type of the test specimen mounting bracket can also have other selections, example
Such as truss structure.
Further, it is additionally provided with locking device between the end of support frame as described above and the top of column.It is filled by locking
The setting set, levelling device occurs slightly to loosen during can avoid disturbance load, causes test specimen to deviate, and then cause load inclined
The heart.
Preferably, the pre-tightening apparatus is pre-loading screw or preload stud；It is provided on the pressure head for the preload spiral shell
Nail pre-tightens the through-hole that stud passes through, and the surface of the box body is provided with the screw thread penetrated for the pre-loading screw or preload stud
Hole.
Further, the one side that the pressure head directly bears load is indent hemisphere face structure.By by the face of pressure head
It is designed as indent hemisphere face structure, while the acting surface for loading actuator is designed as evagination hemisphere face structure, passes through the ball
The self-centering design in face can compensate for the non-perpendicularity error of loading direction and surface of test piece, be conducive to reduce the load during loading
Eccentric degree.
Further, the briquetting is middle alloy unimach block, is set in the one side that the briquetting is contacted with test specimen
It is equipped with carburized layer.Middle alloy unimach is middle carbon unimach of the alloying element content 5%~10%.Pass through carburizing
The setting of layer, improves the case hardness of briquetting, avoids briquetting surface from generating gross distortion, under the positioning accuracy for leading to test specimen
Drop.
Further, the both sides of the pressure head have been fixedly disposed two cantilevers, are located at the cantilever of the opposed both sides of box body
Between be connected with LVDT displacement sensors, for measuring test specimen deformation.
Further, the lifting lug for lifting by crane test specimen box is provided on the top surface of the box body.The setting of lifting lug facilitates
The test specimen box is unloaded in lifting.
Compared with prior art, the test piece fixing device of true triaxial test described in the utility model has the beneficial effect that：
1, by the setting of guide rod, make pressure head only along being moved perpendicular to the direction of box surface, then the surface of briquetting and box
The surface of body is parallel without deflection, and then ensures test specimen with respect to test specimen box not run-off the straight.
2, by the setting for the first screw, the first screw is pre-tightened before loading, is fixed using geomery during preload
Cushion block filling pressure head and box surface between gap, then distance of the pressure head of six direction apart from box surface is by cushion block institute
Control, and then ensure that the geometric center of test specimen is overlapped with the geometric center of test specimen box.
3, the test piece fixing device of true triaxial test described in the utility model is additionally provided with test specimen mounting bracket, is existed by setting
Levelling device between test specimen mounting bracket and test specimen box, the height error for compensating test specimen mounting bracket, and then ensure test specimen box
Horizontality is in before load.
Test piece fixing device described in the utility model for true triaxial test utilizes guide rod, the first screw, cushion block etc.
Ensure positioning accuracy of the test specimen in test specimen box, and then it is inaccurate to solve the problems, such as that test specimen positions in true triaxial test machine,
To be conducive to reduce test error.
Description of the drawings
It, below will be to required use in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing briefly introduce, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be seen
Work is the restriction to range, for those of ordinary skill in the art, without creative efforts, can be with
Other relevant drawings are obtained according to these attached drawings.
Fig. 1 show the structural schematic diagram of the test piece fixing device described in the utility model for true triaxial test.
Fig. 2 show the structural schematic diagram of test specimen box described in the utility model.
Fig. 3 show the sectional view of test specimen box described in the utility model.
Figure label explanation：
30- test specimen mounting brackets；31- base plates；32- columns；40- test specimen boxes；41- supporting racks；42- box bodys；43- pressure heads；
44- last items；45- briquettings；46- guide rods；48- lifting lugs；60- levelling devices；70- locking devices；80-LVDT displacement sensors；90-
First screw；91- cushion blocks；100- test specimens.
Specific implementation mode
Below in conjunction with attached drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out clear
Chu completely describes.It should be appreciated that specific embodiment described herein is used only for explaining the utility model, it is not used to limit
Determine the utility model.Based on the embodiments of the present invention, those skilled in the art are in no creative work under the premise of institute
The every other embodiment obtained, belongs to the scope of protection of the utility model.
It please refers to Fig.1 to Fig.3, present embodiments provides a kind of test piece fixing device for true triaxial test, the examination
Part fixing device aims to solve the problem that the not high problem of existing testing machine positioning part precision.
The test piece fixing device includes test specimen box 40, and the test specimen box 40 is for installing and fixing test specimen 100.
The test specimen box 40 includes box body 42, pressure head 43, last item 44 and briquetting 45.42 rectangular body structure of the box body,
Including upper cover, lower cover and perforation box body, upper cover, lower cover and perforation box body are bolted, in order to ensure test specimen 100 in box body
Installation positioning accuracy inside 42 is not more than 0.15mm, and box body 42 is protected using process means such as wire cutting and numerical control machining centers
Demonstrate,prove its dimensional accuracy.
43 cylindrical structure of the pressure head, the pressure head 43 are set to the outside in six faces of box body 42.The briquetting
45 with the extruding of test specimen 100 for contacting and fixing test specimen 100；The one side that the briquetting 45 is contacted with test specimen 100 is plane, described
Briquetting 45 is set to the inside in six faces of box body 42.It is both provided with through-hole on each face of the box body 42, it is cylindrical
Last item 44 is connect by bolt with pressure head 43 by the through-hole, one end, and the other end is connected by feather key and seam allowance with briquetting 45
It connects.The pressure head 43 passes sequentially through last item 44 and briquetting 45 passes to load for directly bearing vertically or horizontal addload
Test specimen 100.
The surface of the box body 42 is fixed with the guide rod 46 perpendicular to 42 surface of box body, and the pressure head 43 can be along the guide rod
46 axial movement.As an example, setting is offered on the pressure head 43 there are two guide rod 46 on each face of the box body 42
The through-hole of the corresponding guide rod, guide rod 46 penetrate the through-hole, allow pressure head 43 along the axial movement of guide rod 46.Due to pressure head
43 move along guide rod 46 perpendicular to 42 surface of box body, then the surface of briquetting 45 and the surface of box body 42 it is parallel always without
Deflection, and then ensure test specimen 100 with respect to the 40 not run-off the straight of test specimen box.
The pre-tightening apparatus 90 for pre-tightening test specimen 100 is connected between 42 surface of the pressure head 43 and box body, during preload
It is filled by cushion block 91 in gap between pressure head 43 and box body 42.During pre-tightening the pre-tightening apparatus 90, fixed using geomery
Cushion block 91 fill the gap between pressure head 43 and 42 surface of box body, then the pressure head 43 of six direction apart from 42 surface of box body away from
It is controlled from by cushion block 91, and then ensures that the geometric center of test specimen 100 is overlapped with the geometric center of test specimen box 40.
As an example, in the present embodiment, the pre-tightening apparatus 90 selects pre-loading screw or pre-tightens stud；On the pressure head
Be provided with for the pre-loading screw or pre-tighten the through-hole that passes through of stud, the surface of the box body be provided with for the pre-loading screw or
Pre-tighten the threaded hole that stud penetrates.
The above-mentioned test piece fixing device for true triaxial test is tried using guarantees such as guide rod 46, the first screw 90, cushion blocks 91
Positioning accuracy of the part 100 in test specimen box 40, and then solve test specimen 100 and position inaccurate ask in true triaxial test machine
Topic.
In order to improve positioning accuracy of the test specimen box in true triaxial test machine, and then it is further ensured that test specimen is tried in true triaxial
The positioning accuracy in machine is tested, in the present embodiment, the test piece fixing device further includes test specimen mounting bracket 30, the test specimen installation
Frame is used to support and fixes test specimen box 40.
As an example, the test specimen mounting bracket 30 includes the four columns 32 of base plate 31 and square distribution, described
The bottom end of column 32 is fixed on the base plate 31.Corresponding with four columns 32, the test specimen box 40 further includes having to be in
The supporting rack 41 of criss-cross construction, support frame as described above 41 are fixedly arranged at the bottom of box body 42, and the four of support frame as described above 41
A end is connect with the top of four columns 32 respectively.
It should be appreciated that the structure type of the test specimen mounting bracket 30 is not limited to the example above, the test specimen installation
The structure type of frame 30 can also have other selections, such as truss structure.
In view of there may be height errors during installation for test specimen mounting bracket 30, in order to compensate for the height error, institute
It states and is provided with levelling device 60 between test specimen box 40 and test specimen mounting bracket 30.In the present embodiment, the levelling device 60 is set to
Between the end and the top of column 32 of supporting rack 41.Skilled addressee readily understands that, the levelling device 60 is existing
There is mature technology, so no longer its structure is described in detail.
By the setting of levelling device 60, the height error for compensating test specimen mounting bracket 30, and then ensure test specimen box
40 are in horizontality before load.
During being loaded in view of disturbance, levelling device 60 may occur slightly to loosen, and cause test specimen 100 to deviate, Jin Eryin
Play load eccentricity.In the present embodiment, it is additionally provided with locking device between the end of support frame as described above 41 and the top of column 32
70.Skilled addressee readily understands that, the locking device 70 is existing mature technology, so no longer being carried out to its structure
Detailed description.
In the present embodiment, the size of the test specimen 100 can be 50 × 50 × 100cm, 100 × 100 × 100cm or
100 × 100 × 200cm, tri- kinds of specifications.The size of the test specimen 100 of different size, corresponding briquetting 45 also differs.
It, can be by the pressure head in order to reduce load eccentricity degree of the true triaxial test machine during load in the present embodiment
43 directly bear load be designed as indent hemisphere face structure on one side.It is corresponding, the load actuator of true triaxial test machine
Acting surface is designed as evagination hemisphere face structure, and the self-centering design of spherical surface can compensate for loading direction and 100 surface of test specimen
Non-perpendicularity error is conducive to reduce the load eccentricity degree during loading.
In the present embodiment, it is contemplated that briquetting 45 is directly contacted with test specimen 100, in order to improve the case hardness of briquetting 45, institute
Alloy unimach block during briquetting 45 is selected is stated, and carburizing is provided in one side of the briquetting 45 for being contacted with test specimen 100
Layer.The carburized layer improves the case hardness of briquetting 45, avoids 45 surface of briquetting from generating gross distortion, leads to test specimen 100
Positioning accuracy declines.
In addition to this, in the present embodiment, the both sides of the pressure head 43 have been fixedly disposed two cantilevers, are located at 42 phase of box body
LVDT displacement sensors 80 are connected between the cantilever of opposition both sides, for measuring 100 deformation of test specimen.And the box body 42
Lifting lug 48 is provided on top surface, convenient for lifting installation test specimen box 40.
Above description is only a specific implementation of the present invention, but the scope of protection of the utility model is not limited to
In this, any one skilled in the art can readily occur in variation within the technical scope disclosed by the utility model
Or replace, should all it cover within the protection scope of the present utility model.
Claims (9)
1. a kind of test piece fixing device for true triaxial test, which is characterized in that include the examination for installing and fixing test specimen
Part box；The test specimen box includes box body, pressure head, last item and briquetting；The rectangular body structure of box body, the pressure head are set to box
The outside in each face of body, the briquetting are set to the inside in each face of box body；The last item is connected by the trepanning on each face of box body, one end
Pressure head is connect, the other end connects briquetting；The pressure head passes sequentially through last item and briquetting for directly bearing vertical or horizontal addload
Load is passed into test specimen；The briquetting is used to contact with test specimen extruding and fixed test specimen；
The surface of the box body is fixed with the guide rod perpendicular to box surface, and the pressure head can be along the axial movement of the guide rod；
The pre-tightening apparatus for pre-tightening test specimen is connected between the pressure head and box surface, during preload between pressure head and box body between
Gap is filled by cushion block.
2. being used for the test piece fixing device of true triaxial test according to claim 1, which is characterized in that described to be used for true triaxial
The test piece fixing device of experiment further includes test specimen mounting bracket；The test specimen mounting bracket is used to support and fixes the test specimen box, institute
It states and is provided with levelling device between test specimen box and test specimen mounting bracket.
3. being used for the test piece fixing device of true triaxial test according to claim 2, which is characterized in that the test specimen mounting bracket
The bottom end of four columns including base plate and square distribution, the column is fixed on the base plate；
The test specimen box further includes the supporting rack having in criss-cross construction, and support frame as described above is fixedly arranged at the bottom of box body
Four ends in portion, support frame as described above are connect with the top of four columns respectively, and the levelling device is set to the end of supporting rack
Between portion and the top of column.
4. being used for the test piece fixing device of true triaxial test according to claim 3, which is characterized in that the end of support frame as described above
It is additionally provided with locking device between portion and the top of column.
5. being used for the test piece fixing device of true triaxial test according to claim 1, which is characterized in that the pre-tightening apparatus is
Pre-loading screw pre-tightens stud；The through-hole passed through for the pre-loading screw or preload stud, the box are provided on the pressure head
The surface of body is provided with the threaded hole penetrated for the pre-loading screw or preload stud.
6. being used for the test piece fixing device of true triaxial test according to claim 1, which is characterized in that the pressure head is directly held
The one side loaded is indent hemisphere face structure.
7. being used for the test piece fixing device of true triaxial test according to claim 1, which is characterized in that the briquetting is middle conjunction
Golden unimach block is provided with carburized layer in the one side that the briquetting is contacted with test specimen.
8. according to the test piece fixing device for being used for true triaxial test described in required by right 1, which is characterized in that the both sides of the pressure head
Two cantilevers have been fixedly disposed, LVDT displacement sensors have been connected between the cantilever of the opposed both sides of box body, for surveying
Measure test specimen deformation.
9. being used for the test piece fixing device of true triaxial test according to claim 1, which is characterized in that the top surface of the box body
On be provided with lifting lug for lifting by crane test specimen box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721804554.2U CN207730551U (en) | 2017-12-21 | 2017-12-21 | Test piece fixing device for true triaxial test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721804554.2U CN207730551U (en) | 2017-12-21 | 2017-12-21 | Test piece fixing device for true triaxial test |
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| CN207730551U true CN207730551U (en) | 2018-08-14 |
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ID=63085809
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| CN201721804554.2U Active CN207730551U (en) | 2017-12-21 | 2017-12-21 | Test piece fixing device for true triaxial test |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941615A (en) * | 2017-12-21 | 2018-04-20 | 四川德翔科创仪器有限公司 | A kind of three-axis tester and pilot system |
| CN110376053A (en) * | 2019-08-05 | 2019-10-25 | 中国矿业大学(北京) | Deck, device and method for true triaxial experiment three-dimensional load centering |
| WO2021114369A1 (en) * | 2019-12-10 | 2021-06-17 | 东北大学 | True triaxial test system for high-pressure hard rock broadband low-amplitude surface disturbances |
-
2017
- 2017-12-21 CN CN201721804554.2U patent/CN207730551U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107941615A (en) * | 2017-12-21 | 2018-04-20 | 四川德翔科创仪器有限公司 | A kind of three-axis tester and pilot system |
| CN107941615B (en) * | 2017-12-21 | 2024-03-19 | 四川德翔科创仪器有限公司 | Triaxial test machine and test system |
| CN110376053A (en) * | 2019-08-05 | 2019-10-25 | 中国矿业大学(北京) | Deck, device and method for true triaxial experiment three-dimensional load centering |
| WO2021114369A1 (en) * | 2019-12-10 | 2021-06-17 | 东北大学 | True triaxial test system for high-pressure hard rock broadband low-amplitude surface disturbances |
| US11119018B2 (en) | 2019-12-10 | 2021-09-14 | Northeastern University | True triaxial testing system for disturbance experiment with broadband and low amplitude of high pressure hard rock |
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