CN202814809U - Four-point bending test device with adjustable space between pressure heads for asphalt mixture - Google Patents
Four-point bending test device with adjustable space between pressure heads for asphalt mixture Download PDFInfo
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- CN202814809U CN202814809U CN 201220460977 CN201220460977U CN202814809U CN 202814809 U CN202814809 U CN 202814809U CN 201220460977 CN201220460977 CN 201220460977 CN 201220460977 U CN201220460977 U CN 201220460977U CN 202814809 U CN202814809 U CN 202814809U
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- guide rail
- pressure head
- rail platform
- point bending
- bending test
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Abstract
The utility model discloses a four-point bending test device with an adjustable space between pressure heads for an asphalt mixture. The four-point bending test device comprises a guide rail platform, two strip pressure heads with arc bottom and four double-thread screw connecting rods, wherein a protruding round platform with a clamp slot is arranged on the upper surface of the guide rail platform; two parallel guide rail slots penetrating through the upper and lower surfaces of the guide rail platform are formed on the guide rail platform; the top of a pressure head is connected with one ends of the two double-thread screw connecting rods through two screw holes respectively; and the other ends of the two double-thread screw connecting rods penetrate through the two guide rail slots respectively to fix the pressure heads on the lower surface of the guide rail platform. According to the utility model, the pressure heads are connected with the guide rail slots of the guide rail platform through the double-thread screw connecting rods, and the distance between two pressure heads can be adjusted by moving the double-thread screw connecting rods along the guide rail slots so as to adapt to the four-point bending test pieces with different sizes; and meanwhile, the device is convenient in mounting, simple in structure and low in cost; and the parts are convenient to process and manufacture.
Description
Technical field
The utility model belongs to the material mechanical performance field tests, more specifically, relates to a kind of for the adjustable four-point bending test device of the pressure head spacing of asphalt.
Background technology
Four-point bending test is a kind of evaluation fatigue performance of asphalt mixture of at home and abroad comparatively generally carrying out and the test of cracking performance.U.S. SHRP A-003A research project is defined as fatigue performance of asphalt mixture standard of evaluation laboratory experiment with the rectangular beam four-point bending test, but goes back standard or standard that nobody provides relevant asphalt four-point bending beam sample dimensions and experimental technique thereof so far.
Four-point bending test is that the beam test specimen is placed on two symmetrical in relative girder span bearings, and test specimen is applied symmetrical pressure by two pressure heads that are placed in symmetry in the relative girder span in beam top, thereby the mechanical test that the observation test piece deformation develops, the test load displacement concerns, observes crackle genesis and extensions path thereof.
The material universal testing machine of laboratory measurement material mechanical performance is mainly by loading system, strain, displacement measurement system and composition of the control system.When the four-point bending experiment of carrying out ground surface material by the material universal testing machine, the pressure head of design need to be installed on the charger of material universal testing machine moving beam below.Although for the asphalt of different gradation, the size of four-point bending test specimen still is in the exploratory development stage at present, and in order to guarantee the statistical efficiency of experimental result, the minimum value General Requirements of sample dimensions reaches the three-to-four-fold of maximum diameter of aggrogate.The sample dimensions difference is also different to the requirement of pressure head spacing, therefore needs a kind of adjustable four-point bending charger of pressure head spacing that is applicable to asphalt of exploitation.
The utility model content
For the defective of prior art, it is a kind of for the adjustable four-point bending test device of the pressure head spacing of asphalt that the purpose of this utility model is to provide, and is intended to solve existing experimental provision can not be regulated the pressure head spacing for different sample dimensions problem.
For achieving the above object, it is a kind of for the adjustable four-point bending test device of the pressure head spacing of asphalt that the utility model provides, and comprises guide rail platform, two strip pressure head and four both screw links that the bottom is arc; The upper surface of described guide rail platform has the round platform with draw-in groove of a projection, the guide rail platform have two parallel and through the guide-track groove on the upper and lower surface of described guide rail platform; The top of a pressure head is connected with an end of two both screw links respectively by two screws, and the other end of two both screw links passes respectively the lower surface that two guide-track grooves are fixed in described pressure head on described guide rail platform; During work, move both screw link along guide-track groove and adjust distance between two pressure heads.
Further, be fixed on the described guide-track groove by nut and the pad other end with described both screw link.
It is a kind of for the adjustable four-point bending test device of the pressure head spacing of asphalt that the utility model also provides, and comprises guide rail platform, two strip pressure head and four bolts that the bottom is arc; The upper surface of described guide rail platform has the round platform with draw-in groove of a projection, the guide rail platform have two parallel and through the guide-track groove on the upper and lower surface of described guide rail platform; Two bolts pass respectively two guide-track grooves, are screwed into the screw at a pressure head top so that described pressure head is fixed in the lower surface of described guide rail platform by the thread end with two bolts; The nut end of described bolt snaps on the described guide-track groove; During work, move bolt along guide-track groove and adjust distance between two pressure heads.
The four-point bending test device that the utility model provides is connected the guide-track groove of pressure head with the guide rail platform by both screw link, move both screw link along guide-track groove and can adjust two distances between the pressure head, can be adapted to the four-point bending test specimen of different size, simultaneously easy for installation, simple in structure, with low cost, its part is convenient to processing and manufacturing.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the adjustable four-point bending test device of the pressure head spacing that is used for asphalt that provides of the utility model;
Fig. 2 is the 3 d part explosive view of the adjustable four-point bending test device of the pressure head spacing that is used for asphalt that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the one-piece construction of the adjustable four-point bending test device of the pressure head spacing that is used for asphalt that the utility model provides, this four-point bending test device is by guide rail platform 1, semicircle pressure head 2 and 3, and both screw link 4,5,6,7 forms.Guide rail platform 1 is positioned at the top of pressure head 2 and 3, and an outstanding round platform with draw-in groove is arranged on it, is used for connecting material universal testing machine compression-loaded device.There is respectively a ring-shaped guide rail groove that runs through the platform upper and lower surface platform both sides.Semicircle pressure head 2 is identical with 3 shape and size, is positioned at the below of device, is used for the test specimen imposed load.Press pressure head to be close to the lower surface of rectangular guideway platform, its left and right sides, top is a screw respectively, both screw link 4 passes respectively two guide-track grooves and is connected with hemisphere face pressure head 2 with being connected, both screw link 5 passes respectively two guide-track grooves and is connected with semicircle pressure head 3 with being connected, and is with loading pressure head combination at regular intervals thereby form.Both screw link can move along guide-track groove, thereby adjusts the distance between the pressure head.
The four-point bending test device that the utility model provides is connected the guide-track groove of pressure head with the guide rail platform by both screw link, move both screw link along guide-track groove and can adjust two distances between the pressure head, can be adapted to the four-point bending test specimen of different size.
In the utility model, both screw link can substitute with bolt, and when adopting bolt, two bolts pass respectively two guide-track grooves, are screwed into the screw at a pressure head top so that pressure head is fixed in the lower surface of guide rail platform by the thread end with two bolts; Move bolt along guide-track groove and adjust distance between two pressure heads.
Fig. 2 shows the 3 d part explosive view of the four-point bending test device that the utility model provides, wherein, and 8,9,10,11 expression pads, 12,13,14,15 expression nuts.The below describes the installation step of this four-point bending test device in detail:
(1) first threaded rod 4 is screwed connection with being connected in semicircle pressure head 2, similarly connecting rod 5 is screwed connection with being connected in semicircle pressure head 3.
(2) threaded rod 4 and 7 at pressure head 2 two ends is passed respectively two guide-track grooves of guide rail platform 1, cover Upper gasket 10 and 11, screw on nut 14 and 15 wouldn't be tightened again, and pressure head can be slided along guide-track groove.
(3) threaded rod 5 and 6 at pressure head 3 two ends is passed respectively two guide-track grooves of guide rail platform 1, cover Upper gasket 8 and 9, screw on nut 12 and 13 wouldn't be tightened again, and pressure head can be moved along guide-track groove.
(4) according to the requirement of experiment to the pressure head spacing, utilize the scale mark of pressure head end face, adjust symmetrically platform both sides pressure head to assigned address, fastening nut is fastenedly connected pressure head and guide rail platform.
(5) the guide rail platform 1 that will fix semicircle pressure head 2 and 3 is installed on the compression-loaded device of material universal testing machine moving beam below, can utilize the material universal testing machine to carry out four-point bending test.
The four-point bending test device that the utility model provides can be regulated and load the pressure head spacing, adapts to the testing requirements of different size four-point bending test specimen.Lay down a pressure head, also applicable to carrying out three point bending test.
For further description the utility model, the key step that the four-point bending charger that the below's detailed description the utility model provides and material universal testing machine are carried out the asphalt four-point bending test is as follows:
(1) test specimen for preparing is placed in the constant temperature oven that is set as experimental temperature, kept 4 hours.
(2) regulate four-point bending charger two pressure head spacings according to requirement of experiment, then this device is installed on the compression-loaded device of moving beam below of universal testing machine, simultaneously two bearings are fixed on the pedestal of material universal testing machine.
(3) test specimen is placed on two bearings, and adjusts to correct position, extensometer is installed in specimen crack mouth position.
(4) slowly apply a load that is no more than crushing load 5% first, stablize 30s, pressure head is fully contacted with the test specimen upper surface, prevent test specimen slippage in loading procedure.
(5) adopt the displacement of given pace or power load mode to load, until test specimen ruptures fully.
(6) how much pattern photos of cracking face are taken in load-displacement curves, load-crack mouth opening displacement curve, the test specimen surface crack growth path in the record loading procedure.
Four-point bending test device and material universal testing machine that the utility model provides are supporting, easy for installation, simple in structure, with low cost, and its part is convenient to processing and manufacturing.
Those skilled in the art will readily understand; the above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (3)
1. the adjustable four-point bending test device of pressure head spacing that is used for asphalt is characterized in that, comprises guide rail platform, two strip pressure head and four both screw links that the bottom is arc;
The upper surface of described guide rail platform has the round platform with draw-in groove of a projection, the guide rail platform have two parallel and through the guide-track groove on the upper and lower surface of described guide rail platform;
The top of a pressure head is connected with an end of two both screw links respectively by two screws, and the other end of two both screw links passes respectively the lower surface that two guide-track grooves are fixed in described pressure head on described guide rail platform; During work, move both screw link along guide-track groove and adjust distance between two pressure heads.
2. four-point bending test device as claimed in claim 1 is characterized in that, is fixed on the described guide-track groove by nut and the pad other end with described both screw link.
3. the adjustable four-point bending test device of pressure head spacing that is used for asphalt is characterized in that, comprises guide rail platform, two strip pressure head and four bolts that the bottom is arc;
The upper surface of described guide rail platform has the round platform with draw-in groove of a projection, the guide rail platform have two parallel and through the guide-track groove on the upper and lower surface of described guide rail platform;
Two bolts pass respectively two guide-track grooves, are screwed into the screw at a pressure head top so that described pressure head is fixed in the lower surface of described guide rail platform by the thread end with two bolts; The nut end of described bolt snaps on the described guide-track groove; During work, move bolt along guide-track groove and adjust distance between two pressure heads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460977 CN202814809U (en) | 2012-09-11 | 2012-09-11 | Four-point bending test device with adjustable space between pressure heads for asphalt mixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460977 CN202814809U (en) | 2012-09-11 | 2012-09-11 | Four-point bending test device with adjustable space between pressure heads for asphalt mixture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202814809U true CN202814809U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220460977 Expired - Fee Related CN202814809U (en) | 2012-09-11 | 2012-09-11 | Four-point bending test device with adjustable space between pressure heads for asphalt mixture |
Country Status (1)
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|---|---|
| CN (1) | CN202814809U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483187A (en) * | 2014-12-31 | 2015-04-01 | 大连理工大学 | Mechanical property testing device capable of realizing stretching and bending combined loading in different proportions |
| CN105372124A (en) * | 2015-12-12 | 2016-03-02 | 中国飞机强度研究所 | Span-adjustable bending test clamp with positioning function |
| CN106706445A (en) * | 2016-12-09 | 2017-05-24 | 安徽省建筑工程质量监督检测站 | Experiment table for testing bending strength of stone and method for testing bending strength of stone |
| CN107044936A (en) * | 2017-03-27 | 2017-08-15 | 吉林大学 | A kind of fresh meat Quality Detection testing machine with bionical pressure head |
| CN109459305A (en) * | 2018-12-11 | 2019-03-12 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete for hydraulic structure Fatigue Cracking Test device |
-
2012
- 2012-09-11 CN CN 201220460977 patent/CN202814809U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104483187A (en) * | 2014-12-31 | 2015-04-01 | 大连理工大学 | Mechanical property testing device capable of realizing stretching and bending combined loading in different proportions |
| CN105372124A (en) * | 2015-12-12 | 2016-03-02 | 中国飞机强度研究所 | Span-adjustable bending test clamp with positioning function |
| CN106706445A (en) * | 2016-12-09 | 2017-05-24 | 安徽省建筑工程质量监督检测站 | Experiment table for testing bending strength of stone and method for testing bending strength of stone |
| CN107044936A (en) * | 2017-03-27 | 2017-08-15 | 吉林大学 | A kind of fresh meat Quality Detection testing machine with bionical pressure head |
| CN109459305A (en) * | 2018-12-11 | 2019-03-12 | 水利部交通运输部国家能源局南京水利科学研究院 | A kind of concrete for hydraulic structure Fatigue Cracking Test device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130320 Termination date: 20130911 |