CN202814787U - Clamping device and shear splitting device for shear splitting test - Google Patents
Clamping device and shear splitting device for shear splitting test Download PDFInfo
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- CN202814787U CN202814787U CN 201220460976 CN201220460976U CN202814787U CN 202814787 U CN202814787 U CN 202814787U CN 201220460976 CN201220460976 CN 201220460976 CN 201220460976 U CN201220460976 U CN 201220460976U CN 202814787 U CN202814787 U CN 202814787U
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- guide rail
- boss
- top cover
- clamping device
- groove
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Abstract
The utility model discloses a clamping device and a shear splitting device for a shear splitting test. The clamping device comprises a guide rail platform, a movable base and a top cover, wherein a guide rail through channel and a counterbore are formed on the guide rail platform; the movable base is an inverted T-shaped boss structure; the lower surface of the boss base is provided with two parallel guide rails embedded in the guide rail through channel; a through hole fixed with the guide rail platform is formed on the boss base; a screw hole fixed with the top cover is formed at the top of the boss; the top cover is in a platy structure; and a through hole fixed with the top of the boss and a threaded through hole for clamping a test piece are formed on the top cover. According to the utility model, a test piece is clamped by the upper and lower surfaces of a clamping end, and the side surface of the test piece is not shielded, thereby facilitating the observation on the micro-structure change of the test piece in the loading process as well as the damage phenomena such as crack initiation, growth and polymerization and the like; by adjusting the movable base mounted on the guide rail platform, the shear clamping device can adapt to the length change of the test piece; and by adjusting the bolt mounted on the top cover, the shear clamping device can adapt to the height change of the test piece.
Description
Technical field
The utility model belongs to material mechanical performance experimental technique field, more specifically, relates to a kind of clamping device and Shear cracking device that is applicable to the Shear cracking test of asphalt.
Background technology
Owing to have the intensity height, drive a vehicle steady, comfortable, noise is little, is easy to construct and the advantage such as maintenance, bituminous pavement at home and abroad is widely used in high-grade highway and the airfield runway road surface.Yet in recent years, along with the continuous increase of the volume of traffic and increasing of large-scale heavy card, bituminous pavement, is gathered around bag and is pushed such as rut, interlayer slip using early stage a large amount of phenomenons of damaging that just often occur, even the crack etc.Detrusion is to cause rut, interlayer slip, gather around bag and push one of major reason that forms with some cracks.But in Asphalt Pavement Structure Design and asphalt mixture gradation design, the check of shear strength of asphalt mixture often is left in the basket, and causes easily the bituminous pavement shearing strength not enough.
Shear cracking test is the direct method of Research on Asphalt Mixture shearing strength and shear fissure germinating and development mechanism.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.By the anti-shearing cracking performance of material universal testing machine measurement material, can realize by increasing a cover shearing clamping and charger.
Experimental characteristics, shear clamping and charger and must satisfy following 2 requirements: (1) has stronger sample dimensions adaptability.At present, also do not have unified standard for the sample dimensions of different gradation asphalt, in order to guarantee the statistical efficiency of experimental result, the minimum value General Requirements of sample dimensions is the three-to-four-fold of maximum diameter of aggrogate.Sample dimensions is different, just requires clamping device to have the dimensions adjustability by tool, to strengthen the adaptability to sample dimensions.(2) clamping device can not block inspection surface, affects Test Data Collecting.Clamping device may cover the test specimen surface in the test, so that the breakoff phenomenons such as the microstructure change that occurs in the test specimen, crack initiation, growth and polymerization are difficult to observe, thus the research of restriction asphalt anti-cracking performance.
The utility model content
For the defective of prior art, it is a kind of to the sample dimensions strong adaptability and be easy to observe the clamping device that is used for the Shear cracking test of test specimen surface micro-structure variation phenomenon that the purpose of this utility model is to provide.
For achieving the above object, the utility model provides a kind of clamping device for the Shear cracking test, comprise guide rail platform, mobile foundation and top cover, have two parallel bottoms on the described guide rail platform with the guide rail groove of draw-in groove, have on the described guide rail platform for the fixing countersunk of universal testing machine horizontal base; Described mobile foundation is the inverted T-shaped boss structure, and the lower surface of its boss base has two closed slides that are used for embedding in the described guide rail groove, the boss base have for the fixing through hole of guide rail platform, the boss top have for the fixing screw of top cover; Described top cover is platy structure, described top cover comprise for the fixing through hole in described boss top and the tapped through hole that is used for clamping test pieces.
Further, described clamping device also comprises cushion block, described cushion block be positioned at tapped through hole under, be used for to guarantee that the part that the test specimen upper surface is held is stressed evenly.
Further, described guide rail platform is connected by the draw-in groove bolt with described mobile foundation.
Further, by in the tapped through hole of described top cover, being screwed into bolt described test specimen and described cushion block are fixed.
The advantage of the clamping device that the utility model provides is: the combination of (1) movable base and top cover, bolt and cushion block, respectively test specimen bare terminal end upper and lower surface is clamped, and can not block the test specimen side, thereby be convenient to observe the microstructure change of test specimen in loading procedure, and crack initiation, the breakoff phenomenons such as growth and polymerization; (2) be installed in movable base on the guide rail platform by adjusting, shear the variation that clamping device can adapt to test specimen length, regulate the variation that the bolt that is installed on the top cover can adapt to again height of specimen.Simultaneously, between bolt and test specimen surface, be provided with a rectangle cushion block, do not destroy test specimen surface structure when tightening with the assurance bolt downwards, and the test specimen surface is stressed evenly.
Another purpose of the present utility model is to provide a kind of Shear cracking device that comprises above-mentioned clamping device, also comprise and presenting a theatrical performance as the last item on a programme, described presenting a theatrical performance as the last item on a programme is positioned at the top of test specimen, and described presenting a theatrical performance as the last item on a programme has boss with draw-in groove, and described boss with draw-in groove is used for being connected with universal testing machine compression-loaded device.
The Shear cracking device that the utility model provides can support the use with the material universal testing machine, and is easy for installation, simple in structure, with low cost, and its part is convenient to processing and manufacturing; By regulating mobile foundation so that this device can adapt to the bitumen mixture specimen of different length and height; Thereby can also realize by the digital vedio recording instrument whole process observation of test specimen side in the process of the test, can not only observe test piece deformation, and can observe the evolution of Surface crack initiation, development and fine sight structure.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the Shear cracking device that is used for the Shear cracking test that provides of the utility model embodiment;
Fig. 2 is the clamping device mobile foundation structural representation that is used for the Shear cracking test that the utility model embodiment provides;
Fig. 3 is the clamping device cap structure synoptic diagram that is used for the Shear cracking test that the utility model embodiment provides;
Fig. 4 is the 3 d part explosive view of the Shear cracking device that provides of the utility model embodiment.
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.
The utility model provides a kind of shearing clamping that is applicable to asphalt and split test device for the material universal testing machine for the shear failure test of laboratory asphalt pavement material subsized specimen.This device provides shear-type load to test specimen by the compression-loaded of material universal testing machine, can finish the shear failure test of different size asphalt rectangular parallelepiped test specimen, can also be by the digital vedio recording instrument, the overall process of record test specimen Surface crack initiation and development and microstructure change.
As shown in Figure 1, clamping device comprises guide rail platform 1, mobile foundation 2 and top cover 3, has two parallel bottoms on the guide rail platform 1 with the guide rail groove of draw-in groove, have on the guide rail platform 1 for the fixing countersunk of universal testing machine horizontal base; As shown in Figure 2, mobile foundation 2 is the inverted T-shaped boss structure, the lower surface of its boss bottom has two closed slides that are used for embedding in the guide rail groove, the boss bottom have for the fixing through hole of guide rail platform 1, the boss top have for the fixing screw of top cover; As shown in Figure 3, top cover 3 is platy structure, top cover 3 comprise for the fixing through hole in boss top and the tapped through hole that is used for clamping test pieces.
In the utility model, clamping device also comprises cushion block 5, cushion block 5 be positioned at tapped through hole under, be used for to guarantee that the part that the test specimen upper surface is held is stressed evenly.
In the utility model, guide rail platform 1 is connected by the draw-in groove bolt with mobile foundation 2.Can be by in the tapped through hole of top cover 3, being screwed into bolt that test specimen and cushion block 5 is fixing.
As shown in Figure 4, guide rail platform 1 can be rectangular parallelepiped, is positioned at the below of package unit.Be equipped with the countersunk of two circles at the center of guide rail platform 1, purpose is to utilize bolt that the guide rail platform is fixed on the horizontal base of material universal testing machine.Above guide rail platform 1, have along its length the guide rail groove of two rectangles.Guide rail groove below have one identical with guide rail groove length, but slightly wide draw-in groove.Mobile foundation 2 is assemblied on the guide rail platform.Two parallel boss of base bottom embed respectively in the guide rail groove of guide rail platform top.Pedestal can move horizontally along the guide rail groove, thereby the horizontal level of realizing the test specimen bare terminal end is regulated.After moving into place, can utilize the draw-in groove screw bolt and nut that pedestal is fixed on the guide rail platform.The rightmost of base bottom is an overhanging rectangular platform, is close to guide rail, is used for supporting the test specimen bare terminal end.Top cover 3 is installed in the top of mobile foundation by bolt.Also there is an overhanging platform on its right, and corresponding with the overhanging platform of pedestal below, its extension is identical with the length of the overhanging platform of pedestal.The overhanging platform of top cover is equipped with four tapped through holes, is screwed into four pieces of bolts, just the test specimen bare terminal end that is placed between the overhanging platform of pedestal and the overhanging platform of top cover tightly can be withstood, thereby test specimen is fixed.
The advantage of the clamping device that is used for the Shear cracking test that provides at the utility model is: the combination of (1) movable base and top cover, bolt and cushion block, respectively test specimen bare terminal end upper and lower surface is clamped, and can not block the test specimen side, thereby be convenient to observe the microstructure change of test specimen in loading procedure, and crack initiation, the breakoff phenomenons such as growth and polymerization; (2) be installed in movable base on the guide rail platform by adjusting, shear the variation that clamping device can adapt to test specimen length, regulate the bolt 13,14,15,16 that is installed on the top cover, can adapt to again the variation of height of specimen.Simultaneously, between bolt and test specimen surface, be provided with a rectangle cushion block 5, do not destroy test specimen surface structure when tightening with the assurance bolt downwards, and the test specimen surface is stressed evenly.
In the utility model, 6 combine with above-mentioned clamping device and to have consisted of the Shear cracking device presenting a theatrical performance as the last item on a programme, wherein presenting a theatrical performance as the last item on a programme 6 can be rectangular parallelepiped, is positioned at the top of test specimen, 6 boss that have with draw-in groove of presenting a theatrical performance as the last item on a programme are used for being connected with universal testing machine compression-loaded device with the boss of draw-in groove.
In the utility model, the Shear cracking device need to adopt casting die 4 to regulate the position of removable clamping pedestal in use procedure; This casting die 4 can be rectangular parallelepiped.For the utility model further is described, it is as follows in conjunction with Fig. 4 in detail concrete using method and the step of this Shear cracking device to be described in detail now:
(1) guide rail platform 1 is fixed on the horizontal base of material universal testing machine.
(2) two pieces of draw-in groove bolts 7,8 are slipped into respectively in the draw-in groove of two guide rail belows of guide rail platform parallel placement.
(3) mobile foundation is suspended from two pieces of draw-in groove bolts 7,8 top, the slight position of adjusting bolt in draw-in groove, put down gently pedestal, make two pieces of draw-in groove bolts pass respectively two through holes on the base bottom platform, two parallel boss of mobile foundation below are embedded in the guide rail fully.Give draw-in groove bolt 7,8 cover Upper gaskets, screw on respectively again nut 9 and 10, but wouldn't tighten, to guarantee that mobile foundation can slide along the guide rail groove.
(4) with bolt 11 and 12 top cover 3 is fixed on the top of mobile foundation 2, top cover 3 and pedestal 2 are fastenedly connected.
(5) four pieces of bolt 13-16 are screwed into respectively in four tapped through holes of top cover 3 external parts.
(6) end with rectangular parallelepiped casting die 4 is placed on the overhanging platform of mobile foundation 2, and cushion block 5 is filled up above casting die 4, keeps the lateral surface alignment of cushion block 5 and top cover 3, backs out four pieces of bolt 13-16 on the top cover, and the bolt base plane is contacted with cushion block.According to testing requirements, adjust rectangular parallelepiped test specimen overhanging end length, 13-16 then tights a bolt.
(7) will present a theatrical performance as the last item on a programme and 6 be fixed on the loading head of material universal testing machine moving beam below, regulate the position of moving beam, and make the height of 6 base plane of presenting a theatrical performance as the last item on a programme be higher than slightly the upper surface of casting die 4.Mobile foundation 2 under the sponson of casting die being positioned at fully present a theatrical performance as the last item on a programme, is unscrewed and is presented a theatrical performance as the last item on a programme 6.The position of fine setting pedestal 2 when the left side of presenting a theatrical performance as the last item on a programme contacts fully with the top cover right side, is again tightened and is presented a theatrical performance as the last item on a programme 6.Then, the position of fine setting pedestal 2 makes the top cover right side separate slightly with the left side of presenting a theatrical performance as the last item on a programme, and is controlled in the 1mm distance fastening nut 9,10 fixed pedestals 2.
(8) regulate the moving beam of material universal testing machine, make the certain height that rises of presenting a theatrical performance as the last item on a programme, the 13-16 that loosers a bolt unloads piece under pressure 4, changes asphalt rectangular parallelepiped test specimen, according to the fixing test specimen of the operation in the 6th step, and utilizes level meter adjusting test specimen level.
The bracing frame that (9) video camera will be installed is placed on the material universal testing machine limit, regulate camera lens and focal length, make alignment lens test specimen lateral surface, utilize displacement or load loading mode to finish Shear cracking test, observational record test specimen side microstructure change, crack initiation and development phenomenon.
The Shear cracking device that the utility model provides can support the use with the material universal testing machine, and is easy for installation, simple in structure, with low cost, and its part is convenient to processing and manufacturing; By regulating mobile foundation so that this device can adapt to the bitumen mixture specimen of different length and height; Thereby can also realize by the digital vedio recording instrument whole process observation of test specimen side in the process of the test, can not only observe test piece deformation, and can observe the evolution of Surface crack initiation, development and fine sight structure.
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 (5)
1. a clamping device that is used for the Shear cracking test is characterized in that, comprises guide rail platform, mobile foundation and top cover,
Have two parallel bottoms on the described guide rail platform with the guide rail groove of draw-in groove, have on the described guide rail platform for the fixing countersunk of universal testing machine horizontal base;
Described mobile foundation is the inverted T-shaped boss structure, and the lower surface of its boss base has two closed slides that are used for embedding in the described guide rail groove, the boss base have for the fixing through hole of guide rail platform, the boss top have for the fixing screw of top cover;
Described top cover is platy structure, described top cover comprise for the fixing through hole in described boss top and the tapped through hole that is used for clamping test pieces.
2. clamping device as claimed in claim 1 is characterized in that, described clamping device also comprises cushion block, described cushion block be positioned at tapped through hole under, be used for to guarantee that the part that the test specimen upper surface is held is stressed evenly.
3. clamping device as claimed in claim 1 is characterized in that, described guide rail platform is connected by the draw-in groove bolt with described mobile foundation.
4. clamping device as claimed in claim 1 is characterized in that, by be screwed into bolt in the tapped through hole of described top cover described test specimen and described cushion block is fixed.
5. Shear cracking device that comprises each described clamping device of claim 1-4, also comprise and presenting a theatrical performance as the last item on a programme, described presenting a theatrical performance as the last item on a programme is positioned at the top of test specimen, and described presenting a theatrical performance as the last item on a programme has boss with draw-in groove, and described boss with draw-in groove is used for being connected with universal testing machine compression-loaded device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460976 CN202814787U (en) | 2012-09-11 | 2012-09-11 | Clamping device and shear splitting device for shear splitting test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220460976 CN202814787U (en) | 2012-09-11 | 2012-09-11 | Clamping device and shear splitting device for shear splitting test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202814787U true CN202814787U (en) | 2013-03-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220460976 Expired - Fee Related CN202814787U (en) | 2012-09-11 | 2012-09-11 | Clamping device and shear splitting device for shear splitting test |
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| Country | Link |
|---|---|
| CN (1) | CN202814787U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458573A (en) * | 2014-12-10 | 2015-03-25 | 东莞市华贝电子科技有限公司 | Device and method for testing adhesion reliability of mobile phone TP touch screen |
| CN106970019A (en) * | 2017-05-09 | 2017-07-21 | 中国石油天然气集团公司 | A kind of hydrogen induced cracking (HIC) test fixture |
| CN109520818A (en) * | 2018-12-18 | 2019-03-26 | 中国工程物理研究院化工材料研究所 | A kind of high polymer bonding explosive test method and test tool |
| CN110108578A (en) * | 2019-05-31 | 2019-08-09 | 上海工程技术大学 | A kind of shearing test device and system based on universal testing machine |
| CN110361271A (en) * | 2019-08-07 | 2019-10-22 | 西南交通大学 | Material shear property experimental rig and method |
-
2012
- 2012-09-11 CN CN 201220460976 patent/CN202814787U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458573A (en) * | 2014-12-10 | 2015-03-25 | 东莞市华贝电子科技有限公司 | Device and method for testing adhesion reliability of mobile phone TP touch screen |
| CN106970019A (en) * | 2017-05-09 | 2017-07-21 | 中国石油天然气集团公司 | A kind of hydrogen induced cracking (HIC) test fixture |
| CN109520818A (en) * | 2018-12-18 | 2019-03-26 | 中国工程物理研究院化工材料研究所 | A kind of high polymer bonding explosive test method and test tool |
| CN110108578A (en) * | 2019-05-31 | 2019-08-09 | 上海工程技术大学 | A kind of shearing test device and system based on universal testing machine |
| CN110361271A (en) * | 2019-08-07 | 2019-10-22 | 西南交通大学 | Material shear property experimental rig and method |
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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 |