CN105486592B - A kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system - Google Patents
A kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system Download PDFInfo
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- CN105486592B CN105486592B CN201610027705.1A CN201610027705A CN105486592B CN 105486592 B CN105486592 B CN 105486592B CN 201610027705 A CN201610027705 A CN 201610027705A CN 105486592 B CN105486592 B CN 105486592B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/16—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces applied through gearing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/028—One dimensional, e.g. filaments, wires, ropes or cables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0447—Holders for quick insertion/removal of test pieces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
- G01N2203/0458—Chucks, fixtures, jaws, holders or anvils characterised by their material
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- Health & Medical Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system, steel fibre tensioning clamping fixture includes main support, load transmission mechanism and steel fibre specimen holder retaining mechanism, ensures effective clamping and tensioning of the holding piece to steel fibre test specimen in stretching process；Steel fibre tensile property test system includes two sets of steel fibre tensioning clamping fixtures and data acquisition device, the data acquisition device includes load transducer, extensometer and controller, two sets of steel fibre tensioning clamping fixtures are used to clamp steel fibre test specimen, extensometer is provided with steel fibre test specimen, the output end of load transducer and extensometer connects two inputs of controller, the output end connection computer of controller respectively.Steel fibre tensioning clamping fixture and steel fibre tensile property test device provided by the invention, can precisely tested steel fibre tensile strength and deformation parameter, and the Complete stress-strain curve of steel fibre fracture process.
Description
Technical field
The present invention relates to engineering detecting experimental technique field, more particularly to a kind of steel fibre tensioning clamping fixture and steel fibre
Tensile property test system.
Background technology
Steel fiber reinforced concrete is that equably random distribution is in normal concrete matrix by short thin steel fibre, in concrete
Play " crane span structure " between matrix and aggregate, a kind of novel multi-phase composite wood for making concrete material tend to isotropism and being formed
Material.The steel fibre of these random distributions can effectively hinder the extension of inside concrete microcrack and the formation of macrocrack, show
Writing improves tension, bending resistance, shock resistance and the anti-fatigue performance of concrete, has preferable ductility and toughness, and steel fibre coagulation
The performance of these native excellent properties is largely dependent upon tensile strength of the steel fibre relative to concrete substrate, therefore,
When steel fiber reinforced concrete material is designed and applied, the tensile strength of steel fibre and deformation（Or modulus of elasticity）Parameter is to close
Important indicator and foundation of the reason from steel fibre.But for a long time, due to lacking corresponding experimental rig, being especially a lack of can be right
Steel fibre realizes the tension clamp effectively clamped, makes the tensile property of steel fibre be difficult to directly obtain.In practice, steel fibre tension
The parameters of performance are often by its mother metal to be made to the tensile test piece of standard according to the tensile test method of conventional material
Obtain, but because different production technologies is respectively adopted in different types of steel fibre, technical process is by steel fibre finished product
Tensile property produce it is certain influence, so as to cause the tensile property of steel fibre and its mother metal difference, this conjunction to steel fibre
Reason especially cuts off type steel fibers from adverse effect is brought to high tensile steel wire.Therefore, understand the anti-of steel fibre itself to be accurate
Draw performance, it is necessary to develop a kind of simply applicable test device, be that the scientific research of steel fiber reinforced concrete material and engineering should
With offer reliable guarantee.
The content of the invention
, can essence it is an object of the invention to provide a kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system
Quasi- tested steel fibre tensile strength and deformation performance parameter.
The technical solution adopted by the present invention is：
A kind of steel fibre tensioning clamping fixture of the present invention, including main support, load transmission mechanism and steel fibre examination
Part clamping and locking mechanism；
The main support is provided centrally with penetrating the square pilot hole of upper surface and lower surface, square pilot hole both sides top
Main support disjunctor is provided with two limb arms；
The load transmission mechanism include square column type with tooth pull bar, ensure the limiting plate with tooth pull bar linear movement, anti-
Off-gear plate, gear-driven assembly and screw cap；Limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, spacing
Plate is provided centrally with square pilot hole, and band tooth pull bar is provided with pilot hole, and band tooth pull bar lower end disjunctor is provided with for preventing
Depart from the anticreep baffle plate of pilot hole when stop-band tooth pull bar moves up, band tooth pull bar engages with gear-driven assembly, gear-driven assembly
Engaged with screwing cap, it is the tubular structure for being set in the upper and lower ends opening on the outside of two limb arms to screw cap, screws cap and two
Limb arm is connected through a screw thread, and is protruded from tooth pull bar by screwing the opening of cap upper end and is screwed cap, when band tooth pull bar moves down, band tooth
The top of pull bar protrudes from the upper end for screwing cap all the time；
The steel fibre specimen holder retaining mechanism includes the force transmission element of T fonts, the holding piece limit for the structure of falling square cone
Position set and holding piece, force transmission element include the top plate on top and the limiting section of bottom, and limiting section includes solid with top plate lower surface centre
Surely the cylindricality web connected and the square limb post being connected respectively with top plate lower surface both sides, the upper surface edge of top plate is with screwing cap
Lower surface contact, the length of top plate is more than the internal diameter for screwing cap lower end, and the top plate of force transmission element is in the gap that two limb arms are formed
In linear slide up and down, the limiting section of force transmission element linear slide up and down in the square pilot hole on main support；The holding piece
Spacing cover conjoined is arranged on the lower end of main support, sets what is be connected with the square pilot hole at main support center in holding piece stop collar
Limition orientation hole, two holding pieces is provided with limition orientation hole, holding piece includes the specimen holder portion and upper end of lower end tong-like
The connecting portion of square cone, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar, two holding piece clamping parts
The cone angle of composition is equal with the cone angle of holding piece stop collar, and the limb post lower end of force transmission element is provided with the cone with the connecting portion of holding piece
The inclined-plane that face is engaged, the lower surface of the conical surfaces of two holding piece connecting portions respectively with the limb post of corresponding force transmission element contact, power transmission
Part applies pressure by two limb posts to corresponding holding piece, and drives two holding pieces close and clamp steel fibre test specimen.
The gear-driven assembly includes vertical force transmission shaft locating rack, vertical force transmission shaft, vertical power transmission shaft transmission gear, horizontal stroke
It is used for the pass force crossly axle locating rack for limiting pass force crossly shaft position to force transmission shaft tumbler gear, pass force crossly axle and two groups, often
Group pass force crossly axle locating rack includes being separately positioned on two pass force crossly axles positioning subrack with tooth pull bar both sides, and two groups horizontal
Force transmission shaft locating rack is vertically provided on the limb arm between two limiting plates, is provided with each pass force crossly axle positioning subrack
Pass force crossly axle, and pass force crossly axle contacts with the band tooth pull bar of respective side, pass force crossly axle and pass force crossly axle positioning subrack
Rotation connection, pass force crossly axle are provided with the wheel being meshed with the driving cog on tooth pull bar with the position being in contact with tooth pull bar
Tooth, one end of pass force crossly axle are provided with pass force crossly axle tumbler gear；Between two limiting plates with pass force crossly axle commutating tooth
Position corresponding to wheel is provided with vertical force transmission shaft locating rack, and vertical force transmission shaft is rotatablely connected with vertical force transmission shaft locating rack, is erected
Position corresponding with pass force crossly axle tumbler gear is provided with vertical power transmission shaft transmission gear on to force transmission shaft；Cap madial wall is screwed to set
It is equipped be engaged with vertical power transmission shaft transmission gear vertical and screws tooth, screws and internal thread is set on the madial wall of cap bottom,
Two limb facies lateralis brachiis are provided with and screwed the external screw thread of cap screw-internal thread fit.
Described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and ball pivot head, ball pivot head upper end are provided with ball pivot nest
It is fixedly installed tension rod.
Offered in the middle part of described holding piece stop collar and be easy to lead to steel fibre test specimen progress clipping operation and the U-shaped of observation
Groove, clamping face when two holding pieces clamp are located on the center line of U-shaped groove.
Described force transmission element limiting section lower surface is vertically fixedly installed at least two ejector springs, the lower end of ejector spring
Contacted with the upper surface of two holding pieces；The adjacent surface top of two holding pieces set it is fluted, be horizontally arranged with groove to
Open spring in a few top.
The outside of the main support and corresponding with internal thread screw six corners being provided with the outside of cap for fastening.
Steel fibre tensile property test system of the present invention, including two sets of steel fibre tensioning clamping fixtures and data are adopted
Acquisition means, the data acquisition device include load transducer, extensometer and controller, a set of steel fibre tensioning clamping fixture
It is used for the jaw that tensile testing machine is connected by load transducer, the band tooth of another set of steel fibre tensioning clamping fixture with tooth pull bar
Pull bar is used for the jaw for being directly connected to tensile testing machine, and two sets of steel fibre tensioning clamping fixtures are used to clamp steel fibre test specimen, drawn
Stretch meter to be clamped on steel fibre test specimen, the signal output part of load transducer and the signal output part of extensometer connect control respectively
The first signal input part and secondary signal input of device, the signal output part of controller are used to connect computer；Described steel
Fiber tensioning clamping fixture, including main support, load transmission mechanism and steel fibre specimen holder retaining mechanism；In the main support
The heart is provided with the square pilot hole of insertion upper surface and lower surface, and square pilot hole both sides top is provided with two with main support disjunctor
Individual limb arm；The load transmission mechanism include square column type with tooth pull bar, ensure the limiting plate with tooth pull bar linear movement, anticreep
Baffle plate, gear-driven assembly and screw cap；Limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, limiting plate
Square pilot hole is provided centrally with, band tooth pull bar is provided with pilot hole, band tooth pull bar lower end disjunctor is provided with for preventing
When being moved up with tooth pull bar depart from pilot hole anticreep baffle plate, band tooth pull bar engaged with gear-driven assembly, gear-driven assembly and
Cap engagement is screwed, it is the tubular structure for being set in the upper and lower ends opening on the outside of two limb arms to screw cap, screws cap and two limbs
Arm is connected through a screw thread, and is protruded from tooth pull bar by screwing the opening of cap upper end and is screwed cap, and when band tooth pull bar moves down, band tooth is drawn
The top of bar protrudes from the upper end for screwing cap all the time；The steel fibre specimen holder retaining mechanism includes the force transmission element of T fonts, fallen
The holding piece stop collar and holding piece of square cone structure, force transmission element include the top plate on top and the limiting section of bottom, limiting section
The square limb post being connected including the cylindricality web with being fixedly connected among top plate lower surface and respectively with top plate lower surface both sides, top
The upper surface edge of plate contacts with screwing the lower surface of cap, and the length of top plate is more than the internal diameter for screwing cap lower end, the top of force transmission element
Plate linear slide up and down in the gap that two limb arms are formed, the limiting section of force transmission element in the square pilot hole on main support on
Lower linear slide；The spacing cover conjoined of holding piece is arranged on the lower end of main support, set in holding piece stop collar with main support
The limition orientation hole that the square pilot hole of the heart is connected, two holding pieces is provided with limition orientation hole, holding piece includes lower end
The specimen holder portion of tong-like and the connecting portion of upper end square cone, the lower end that clamping part lower end protrudes from holding piece stop collar are opened
Mouthful, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, and the limb post lower end of force transmission element is provided with
The inclined-plane being engaged with the conical surface of the connecting portion of holding piece, the conical surfaces of the two holding piece connecting portions limb with corresponding force transmission element respectively
The lower surface contact of post, force transmission element applies pressure by two limb posts to corresponding holding piece, and drives two holding pieces close
And clamp steel fibre test specimen.
Gear-driven assembly in described steel fibre tensioning clamping fixture includes vertical force transmission shaft locating rack, vertical power transmission
Axle, vertical power transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and two groups are used to limit pass force crossly axle position
The pass force crossly axle locating rack put, every group of pass force crossly axle locating rack include being separately positioned on two transverse directions with tooth pull bar both sides
Force transmission shaft positions subrack, and two groups of pass force crossly axle locating racks are vertically provided on the limb arm between two limiting plates, each horizontal
Pass force crossly axle is provided with force transmission shaft positioning subrack, and pass force crossly axle contacts with the band tooth pull bar of respective side, laterally passes
Power axle and the positioning subrack rotation connection of pass force crossly axle, the position that pass force crossly axle is in contact with tooth pull bar is provided with draws with band tooth
The gear teeth that driving cog on bar is meshed, one end of pass force crossly axle are provided with pass force crossly axle tumbler gear；Two limiting plates
Between position corresponding with pass force crossly axle tumbler gear be provided with vertical force transmission shaft locating rack, vertical force transmission shaft passes with vertical
Power axle locating rack is rotatablely connected, and position corresponding with pass force crossly axle tumbler gear passes provided with vertical force transmission shaft on vertical force transmission shaft
Moving gear；Screw cap madial wall and be provided be engaged with vertical power transmission shaft transmission gear vertical and screw tooth, screw cap bottom
Madial wall on internal thread is set, two limb facies lateralis brachiis are provided with and screwed the external screw thread of cap screw-internal thread fit.
Described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and ball pivot head, ball pivot head upper end are provided with ball pivot nest
It is fixedly installed tension rod.
Offered in the middle part of described holding piece stop collar and be easy to lead to steel fibre test specimen progress clipping operation and the U-shaped of observation
Groove, clamping face when two holding pieces clamp are located on the center line of U-shaped groove.
The steel fibre tensioning clamping fixture of the present invention can ensure that during tensioning steel fibre test specimen holding piece is to steel fibre
The chucking power of test specimen can increase with the increasing of outside stretching force, clamping of the holding piece to steel fibre is increasingly fastened.
Holding piece stop collar of the present invention, holding piece and force transmission element structure are equipped with so that holding piece screws cap
When being screwed along main support, two holding pieces parallel can compress steel fibre test piece end, ensure steel fibre test piece end uniform force,
Avoid the generation of stress concentration.
Two limiting plates and each limb arm inner side laterally pass for two groups up and down up and down in the steel fibre tensioning holing clip of the present invention
The setting of power axle ensure that the uniformity with stability of the tooth pull bar in vertical sliding motion and load transmission.
The setting of ball pivot head ensures steel fibre uniform force in the present invention, avoid occur in clamping process because of centering not
The accurately adverse effect to caused by result of the test.
The hardness of holding piece is higher than steel fibre in the present invention, and material is high-speed steel, beneficial to clamping steel fibre；The holding piece
Clamping face for clamping steel fibre test specimen is provided with the steel fibre for preventing steel fibre from slipping and anchors tooth, to prevent steel fibre from anchoring
Hold the generation of stress concentration.
The setting of ejector spring in steel fibre tensioning clamping fixture of the present invention so that, can profit when installing steel fibre test specimen
Holding piece is ejected to the opening of the U-shaped groove of holding piece stop collar with ejector spring, is easy to the installation to steel fibre test specimen.
The setting of spring is opened on top in steel fibre tensioning clamping fixture of the present invention so that is installing and uninstalling steel fibre
During test specimen, open spring using top and push up out two holding pieces round about, be easy to load and take out steel fibre test specimen.
Steel fibre tensile property Design of Test System of the present invention is reasonable, and it is disconnected from being loaded into accurately to test steel fibre
The load and deformation values of overall process are split, data basis is provided to obtain the load-deformation full curve of steel fibre rupture failure, and
It is simple in construction, measuring accuracy is high, implementation easy to spread.
Brief description of the drawings
Fig. 1 is the front view of steel fibre tensioning clamping fixture sectional view in the present invention；
Fig. 2 is the side view of steel fibre tensioning clamping fixture sectional view in the present invention；
Fig. 3 is the profile of A-A in Fig. 1；
Fig. 4 is the structural representation of steel fibre tensile property test system in the present invention；
Fig. 5 is answering for the steel fibre Tensile Fracture Process that the steel fibre tensile property test system of the use present invention obtains
Power-strain full curve.
In figure：Tension rod 1, ball pivot are first 2, ball pivot nest 3, band tooth pull bar 4, limiting plate 5, vertical force transmission shaft locating rack 6, vertical
Force transmission shaft 7, vertical power transmission shaft transmission gear 8, pass force crossly axle tumbler gear 9, pass force crossly axle locating rack 10, pass force crossly axle
11st, spring 15, steel fibre anchoring tooth 16, holding piece stop collar 17, folder are driven in anticreep baffle plate 12, force transmission element 13, ejector spring 14, top
Piece 18 is held, cap 19, limb arm 20 is screwed, screws tooth 21, internal thread 22, main support 23, steel fibre test specimen 24, extensometer 25, calculating
Machine 26, controller 27, load transducer 28.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, steel fibre tensioning clamping fixture, including main support 23, load transmission mechanism and steel are fine
Tie up specimen holder retaining mechanism.
The main support 23 is provided centrally with penetrating the square pilot hole of upper surface and lower surface, on square pilot hole both sides
Side is provided with two limb arms 20 with the disjunctor of main support 23；
The load transmission mechanism include square column type with tooth pull bar 4, ensure the limiting plate 5 with the linear movement of tooth pull bar 4,
Anticreep baffle plate 12, gear-driven assembly and screw cap 19；The transversal conjoined of limiting plate 5 is arranged on two tops of limb arm 20 and madial wall
Middle part, limiting plate 5 are provided centrally with square pilot hole, and band tooth pull bar 4, the lower end disjunctor of band tooth pull bar 4 are provided with pilot hole
The anticreep baffle plate 12 for departing from pilot hole when being moved up for anti-stop-band tooth pull bar 4 is provided with, band tooth pull bar 4 is nibbled with gear-driven assembly
Close, gear-driven assembly engages with screwing cap 19, and it is the upper and lower ends opening for being set in two outsides of limb arm 20 to screw cap 19
Tubular structure, screw cap 19 and be connected through a screw thread with two limb arms 20, protruded with tooth pull bar 4 by screwing the opening of the upper end of cap 19
In screwing cap 19, when band tooth pull bar 4 moves down, the top with tooth pull bar 4 protrudes from the upper end for screwing cap 19 all the time.
The clamping and locking mechanism of steel fibre test specimen 24 includes the clamping of the force transmission element 13, the structure of falling square cone of T fonts
Piece stop collar 17 and holding piece 18, the top plate of force transmission element 13 including top and the limiting section of bottom, limiting section include with top plate
The cylindricality web being fixedly connected among end face and the square limb post being connected respectively with top plate lower surface both sides, the upper surface side of top plate
Edge contacts with screwing the lower surface of cap 19, and the length of top plate is more than the internal diameter for screwing the lower end of cap 19, and the top plate of force transmission element 13 is two
Linear slide up and down in the gap that individual limb arm 20 is formed, the square guiding of the limiting section of force transmission element 13 on main support 23 is arranged on
Linear slide above and below in hole；The disjunctor of holding piece stop collar 17 is arranged on the lower end of main support 23, in holding piece stop collar 17
If the limition orientation hole being connected with the square pilot hole at the center of main support 23, two holding pieces are provided with limition orientation hole
18, holding piece 18 includes the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, and specimen holder subordinate's distal process goes out
In the lower ending opening of holding piece stop collar 17, the cone angle of the cone angle and holding piece stop collar 17 of two clamping part of holding piece 18 compositions
Equal, the lower end of the limb post of force transmission element 13 is provided with the inclined-plane being engaged with the conical surface of the connecting portion of holding piece 18, two clampings
Lower surface of the conical surface of the connecting portion of piece 18 respectively with the corresponding limb post of force transmission element 13 contacts, force transmission element 13 by two limb posts to
Corresponding holding piece 18 applies pressure, and drives two holding pieces 18 close and clamp steel fibre test specimen 24.
In the present invention, the holding piece stop collar 17, holding piece 18 and the structure of force transmission element 13 are equipped with so that clamping
Piece 18 screw cap 19 along main support 23 screw when, force transmission element 13 by two limb posts to corresponding holding piece 18 apply pressure, and
Two holding pieces 18 of driving are close and clamp steel fibre test specimen 24, ensure the uniform force of steel fibre test specimen 24, avoid stress concentration
Generation.
The outer of the top plate of the limited post of holding piece 18 matches with screwing cap 19, and in the present embodiment, holding piece 18 limits
The top plate of position post uses square plate of the both ends for arc, i.e. width between two limb arms 20 of the width of top plate and two main supports 23
Equal, the arc size at the length direction both ends of top plate is consistent with screwing the external diameter radian of cap 19.The hardness of the holding piece 18 is high
In steel fibre, material is high-speed steel, beneficial to clamping steel fibre；The holding piece 18 is used for the clamping face for clamping steel fibre test specimen 24
The steel fibre anchoring tooth for preventing steel fibre from slipping is provided with, the steel fibre anchoring tooth is a kind of closely-pitched line, to prevent stress collection
In generation.
The gear-driven assembly includes vertical force transmission shaft locating rack 6, vertical force transmission shaft 7, the travelling gear of vertical force transmission shaft 7
8th, pass force crossly axle tumbler gear 9, pass force crossly axle 11 and two groups are used for the pass force crossly axle for limiting the position of pass force crossly axle 11
Locating rack 10, every group of pass force crossly axle locating rack 10 include being separately positioned on two pass force crossly axles 11 with the both sides of tooth pull bar 4
Subrack is positioned, two groups of pass force crossly axle locating racks 10 are vertically provided on the limb arm 20 between two limiting plates 5, each laterally to pass
Power axle 11 positions in subrack and is provided with pass force crossly axle 11, and pass force crossly axle 11 contacts with the band tooth pull bar 4 of respective side, horizontal
Subrack rotation connection, the position that pass force crossly axle 11 is in contact with tooth pull bar 4 are positioned to force transmission shaft 11 and pass force crossly axle 11
Provided with the gear teeth being meshed with the driving cog on tooth pull bar 4, one end of pass force crossly axle 11 is provided with the commutation of pass force crossly axle
Gear 9；Between two limiting plates 5 vertical force transmission shaft locating rack is provided with 9 corresponding position of pass force crossly axle tumbler gear
6, vertical force transmission shaft 7 is rotatablely connected with vertical force transmission shaft locating rack 6, right with pass force crossly axle tumbler gear 9 on vertical force transmission shaft 7
The position answered is provided with the vertical travelling gear 8 of force transmission shaft 7；The madial wall of cap 19 is screwed to be provided with and the vertical phase of 7 travelling gear of force transmission shaft 8
What is coordinated vertically screws tooth 21, screws setting internal thread 22 on the madial wall of the bottom of cap 19, and two lateral surfaces of limb arm 20 are set
There is and screws the external screw thread that the internal thread 22 of cap 19 coordinates.In the present embodiment, the rotation screwed where tooth 21 for screwing cap 19
The diameter of the madial wall upper end of tight cap 19 screws the madial wall bottom of cap 19 more than the place of internal thread 22 for screwing cap 19
Diameter, the helicitic texture that the load for being advantageous to screwing and transmitting because screwing the top of cap 19 makes to screw the bottom of cap 19 obtain tightly
Gu.In the present embodiment, pass force crossly axle tumbler gear 9 and the tumbler gear of vertical force transmission shaft 7 use bevel gear, can be by pass force crossly
Horizontally rotating for axle 11 is mutually changed with the vertical rotating of vertical force transmission shaft 7.
The described upper end disjunctor of band tooth pull bar 4 is provided with ball pivot nest 3, is provided with ball pivot first 2 in ball pivot nest 3, on ball pivot first 2
End is fixedly installed tension rod 1.The setting of ball pivot first 2 ensures steel fibre uniform force in the present invention, avoids clamping process
Middle appearance is adversely affected caused by result of the test because of centering inaccuracy.
The described middle part of holding piece stop collar 17, which offers, to be easy to carry out clipping operation and the U of observation to steel fibre test specimen 24
Type groove.When two holding pieces 18 clamp steel fibre test specimen 24, the center line of the clamping face and U-shaped groove of two blessing pieces 18 is put down
OK.
The described limiting section lower surface of force transmission element 13 is vertically fixedly installed at least two ejector springs 14, ejector spring 14
Lower end contacted with the upper surface of two holding pieces 18；The adjacent surface top of two holding pieces 18 sets fluted, horizontal stroke in groove
Spring 15 is opened at least one top is provided with.The setting of ejector spring 14 in steel fibre tensioning clamping fixture of the present invention so that
When steel fibre test specimen 24 is installed, holding piece 18 is ejected to the tapered opening of holding piece stop collar 17 using ejector spring 14, just
In the installation to steel fibre test specimen 24.The setting of spring 15 is opened on top in steel fibre tensioning clamping fixture of the present invention so that is being installed
During with unloading steel fibre test specimen 24, open spring 15 using top two holding pieces 18 push up round about and open, be easy to load with
Take out steel fibre test specimen 24.
The outside of the main support 23 and the outside for screwing cap 19 corresponding with internal thread 22 are provided with for fastening
Six corners, the fastening structure of screw bolt and nut formula is formed, be easy to carry out screwing operations using fastening tools such as spanners；
As shown in figure 4, steel fibre tensile property test system of the present invention, including two sets of steel fibre tensioning holing clips
Tool and data acquisition device, the data acquisition device include load transducer 28, extensometer 25 and controller 27, and a set of steel is fine
Tie up the fine with jaw of the tooth pull bar 4 for connecting tensile testing machine by load transducer 28, another set of steel of tensioning clamping fixture
Being used for tooth pull bar 4 of dimension tensioning clamping fixture is directly connected to the jaw of tensile testing machine, two sets of steel fibre tensioning clamping fixtures
For clamping steel fibre test specimen 24, extensometer 25 is clamped on steel fibre test specimen 24, the signal output part of load transducer 28 and
The signal output part of extensometer 25 connects the first signal input part and secondary signal input of controller 27, controller 27 respectively
Signal output part be used for connect computer 26；Described steel fibre tensioning clamping fixture, including main support 23, load transmit machine
Structure and the clamping and locking mechanism of steel fibre test specimen 24；The main support 23 is provided centrally with penetrating upper surface and the square of lower surface is led
Xiang Kong, square pilot hole both sides top are provided with two limb arms 20 with the disjunctor of main support 23；The load transmission mechanism includes side
Cylindricality with tooth pull bar 4, ensure the limiting plate 5 with the linear movement of tooth pull bar 4, anticreep baffle plate 12, gear-driven assembly and screw
Cap 19；The transversal conjoined of limiting plate 5 is arranged in the middle part of two tops of limb arm 20 and madial wall, and limiting plate 5 is provided centrally with square
Pilot hole, band tooth pull bar 4 is provided with pilot hole, the lower end disjunctor of band tooth pull bar 4 is provided with when being moved up for anti-stop-band tooth pull bar 4
Depart from the anticreep baffle plate 12 of pilot hole, band tooth pull bar 4 is engaged with gear-driven assembly, and gear-driven assembly is nibbled with screwing cap 19
Close, screw the tubular structure that cap 19 is the upper and lower ends opening for being set in two outsides of limb arm 20, screw cap 19 and two limb arms
20 are connected through a screw thread, and are protruded from tooth pull bar 4 by screwing the opening of the upper end of cap 19 and screw cap 19, when band tooth pull bar 4 moves down,
Top with tooth pull bar 4 protrudes from the upper end for screwing cap 19 all the time.The clamping and locking mechanism of steel fibre test specimen 24 includes T fonts
Force transmission element 13, the holding piece stop collar 17 and holding piece 18 of the structure of falling square cone, the top plate of force transmission element 13 including top and
The limiting section of bottom, limiting section include with the cylindricality web that is fixedly connected among top plate lower surface and respectively with top plate lower surface two
The square limb post of side connection, the upper surface edge of top plate contact with screwing the lower surface of cap 19, and the length of top plate, which is more than, screws cap
The internal diameter of 19 lower ends, the top plate of force transmission element 13 linear slide up and down in the gap that two limb arms 20 are formed, the limit of force transmission element 13
Position portion upper and lower linear slide in the square pilot hole being arranged on main support 23；The disjunctor of holding piece stop collar 17 is arranged on
The lower end of main support 23, the limition orientation being connected with the square pilot hole at the center of main support 23 is set in holding piece stop collar 17
Hole, two holding pieces 18 are provided with limition orientation hole, and holding piece 18 includes specimen holder portion and the upper end side's cone of lower end tong-like
The connecting portion of platform shape, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar 17, two clamping parts of holding piece 18
The cone angle of composition is equal with the cone angle of holding piece stop collar 17, and the lower end of the limb post of force transmission element 13 is provided with the company with holding piece 18
The inclined-plane that the conical surface of socket part is engaged, the conical surface of the connecting portion of two holding pieces 18 respectively with the corresponding limb post of force transmission element 13
End contact, force transmission element 13 applies pressure by two limb posts to corresponding holding piece 18, and drives two holding pieces 18 close
And clamp steel fibre test specimen 24.
The gear-driven assembly includes vertical force transmission shaft locating rack 6, vertical force transmission shaft 7, the travelling gear of vertical force transmission shaft 7
8th, pass force crossly axle tumbler gear 9, pass force crossly axle 11 and two groups are used for the pass force crossly axle for limiting the position of pass force crossly axle 11
Locating rack 10, every group of pass force crossly axle locating rack 10 include being separately positioned on two pass force crossly axles 11 with the both sides of tooth pull bar 4
Subrack is positioned, two groups of pass force crossly axle locating racks 10 are vertically provided on the limb arm 20 between two limiting plates 5, each laterally to pass
Power axle 11 positions in subrack and is provided with pass force crossly axle 11, and pass force crossly axle 11 contacts with the band tooth pull bar 4 of respective side, horizontal
Subrack rotation connection, the position that pass force crossly axle 11 is in contact with tooth pull bar 4 are positioned to force transmission shaft 11 and pass force crossly axle 11
Provided with the gear teeth being meshed with the driving cog on tooth pull bar 4, one end of pass force crossly axle 11 is provided with the commutation of pass force crossly axle
Gear 9；Between two limiting plates 5 vertical force transmission shaft locating rack is provided with 9 corresponding position of pass force crossly axle tumbler gear
6, vertical force transmission shaft 7 is rotatablely connected with vertical force transmission shaft locating rack 6, right with pass force crossly axle tumbler gear 9 on vertical force transmission shaft 7
The position answered is provided with the vertical travelling gear 8 of force transmission shaft 7；The madial wall of cap 19 is screwed to be provided with and the vertical phase of 7 travelling gear of force transmission shaft 8
What is coordinated vertically screws tooth 21, screws setting internal thread 22 on the madial wall of the bottom of cap 19, and two lateral surfaces of limb arm 20 are set
There is and screws the external screw thread that the internal thread 22 of cap 19 coordinates.In the present embodiment, the rotation screwed where tooth 21 for screwing cap 19
The diameter of the madial wall upper end of tight cap 19 screws the madial wall bottom of cap 19 more than the place of internal thread 22 for screwing cap 19
Diameter, the helicitic texture that the load for being advantageous to screwing and transmitting because screwing the top of cap 19 makes to screw the bottom of cap 19 obtain tightly
Gu.In the present embodiment, pass force crossly axle tumbler gear 9 and the tumbler gear of vertical force transmission shaft 7 use bevel gear, can be by pass force crossly
Horizontally rotating for axle 11 is mutually changed with the vertical rotating of vertical force transmission shaft 7.
Controller 27 in the present invention includes amplifier, A/D converter, microprocessor（CPU）, memory, communication interface
Circuit etc., it is prior art, repeats no more.
When carrying out the tensile test of steel fibre, a set of steel in steel fibre tensile property test system of the present invention
One end of the tension rod 1 and load transducer 28 of fiber tensioning clamping fixture is connected through a screw thread, load transducer 28 it is another
The tension rod 1 with the jaw for connecting tensile testing machine is held to be threadedly coupled, the tensioning of another set of steel fibre tensioning clamping fixture
Bar 1 is directly connected with the jaw of tensile testing machine.Load transducer in steel fibre tensile property test system of the present invention
28 and extensometer 25 analog signal collected is passed into controller 27 respectively, controller 27 converts analog signals into number
Computer 26 is passed to after word signal, computer 26 is by software records and preserves the data transmitted.To one kind in the present embodiment
The tensile property of cold-drawn low-carbon cut-out type steel fibers is tested, and the basic physical index of tested steel fibre is as shown in table 1, this reality
The stress-strain for applying the steel fibre Tensile Fracture Process that the result that example is tested one group of steel fibre is as shown in table 2, obtains is complete
Curve is as shown in Figure 5.
Every physical index of the steel fibre of table 1
The steel fibre tensile breakage of table 2 destroys test result
It can be facilitated using the steel fibre tensile property test system of the present invention it can be seen from table 2 and Fig. 5 result of the test
The stress-strain curve of the tensile property experiment process of steel fibre test specimen 24 is obtained, surveys the limit of one group of steel fibre test specimen 24
The ratio percentage of strength criterion variance and average value is 3.8%, the ratio percentage of limiting strain standard variance and average value is
11.5%。
The present embodiment not makees any formal limitation to the shape of invention, material, structure etc., every according to the present invention
Any simple modification, equivalent change and modification for being made to above example of technical spirit, belong to technical solution of the present invention
Protection domain.
Claims (10)
- A kind of 1. steel fibre tensioning clamping fixture, it is characterised in that：Pressed from both sides including main support, load transmission mechanism and steel fibre test specimen Hold retaining mechanism；The main support is provided centrally with penetrating the square pilot hole of upper surface and lower surface, square pilot hole both sides top and master Support disjunctor is provided with two limb arms；The load transmission mechanism include square column type with tooth pull bar, ensure the limiting plate with tooth pull bar linear movement, anti-off-gear Plate, gear-driven assembly and screw cap；Limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, in limiting plate The heart is provided with square pilot hole, and band tooth pull bar is provided with pilot hole, and band tooth pull bar lower end disjunctor is provided with for anti-stop-band Depart from the anticreep baffle plate of pilot hole when tooth pull bar moves up, band tooth pull bar engages with gear-driven assembly, gear-driven assembly and rotation Tight cap engagement, it is the tubular structure for being set in the upper and lower ends opening on the outside of two limb arms to screw cap, screws cap and two limb arms It is connected through a screw thread, is protruded from tooth pull bar by screwing the opening of cap upper end and screw cap, when band tooth pull bar moves down, band tooth pull bar Top protrude from the upper end for screwing cap all the time；The steel fibre specimen holder retaining mechanism includes force transmission element, the holding piece stop collar for the structure of falling square cone of T fonts And holding piece, force transmission element include the top plate on top and the limiting section of bottom, limiting section includes connecting with fixed among top plate lower surface The cylindricality web connect and the square limb post being connected respectively with top plate lower surface both sides, the upper surface edge of top plate is with screwing under cap End contact, the length of top plate are more than the internal diameter for screwing cap lower end, the top plate of force transmission element in the gap that two limb arms are formed on Lower linear slide, the limiting section of force transmission element linear slide up and down in the square pilot hole on main support；The holding piece is spacing Cover conjoined is arranged on the lower end of main support, set in holding piece stop collar be connected with the square pilot hole at main support center it is spacing Pilot hole, two holding pieces are provided with limition orientation hole, and holding piece includes specimen holder portion and the upper end side's cone of lower end tong-like The connecting portion of platform shape, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar, two holding piece clamping part compositions Cone angle it is equal with the cone angle of holding piece stop collar, the limb post lower end of force transmission element is provided with the conical surface phase with the connecting portion of holding piece The inclined-plane of cooperation, the lower surface of the conical surfaces of two holding piece connecting portions respectively with the limb post of corresponding force transmission element contact, and force transmission element leads to Cross two limb posts and apply pressure to corresponding holding piece, and drive two holding pieces close and clamp steel fibre test specimen.
- 2. steel fibre tensioning clamping fixture according to claim 1, it is characterised in that：The gear-driven assembly includes perpendicular To force transmission shaft locating rack, vertical force transmission shaft, vertical power transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and Two groups of pass force crossly axle locating racks for being used to limit pass force crossly shaft position, every group of pass force crossly axle locating rack include setting respectively With tooth pull bar both sides two pass force crossly axles position subrack, two groups of pass force crossly axle locating racks be vertically provided at two it is spacing On limb arm between plate, be provided with pass force crossly axle in each pass force crossly axle positioning subrack, and pass force crossly axle with it is corresponding The band tooth pull bar contact of side, pass force crossly axle is with the positioning subrack rotation connection of pass force crossly axle, pass force crossly axle and with tooth pull bar The position being in contact is provided with the gear teeth being meshed with the driving cog on tooth pull bar, and one end of pass force crossly axle is provided with horizontal biography Power axle tumbler gear；Position corresponding with pass force crossly axle tumbler gear is provided with vertical force transmission shaft and determined between two limiting plates Position frame, vertical force transmission shaft and vertical force transmission shaft locating rack are rotatablely connected, on vertical force transmission shaft with pass force crossly axle tumbler gear pair The position answered is provided with vertical power transmission shaft transmission gear；Screw cap madial wall and be provided with what is be engaged with vertical power transmission shaft transmission gear Tooth vertically is screwed, screws and internal thread is set on the madial wall of cap bottom, two limb facies lateralis brachiis are provided with and screwed spiral shell in cap The external screw thread that line coordinates.
- 3. steel fibre tensioning clamping fixture according to claim 1 or 2, it is characterised in that：Described band tooth pull bar upper end Disjunctor is provided with ball pivot nest, and ball pivot head is provided with ball pivot nest, and ball pivot head upper end is fixedly installed tension rod.
- 4. steel fibre tensioning clamping fixture according to claim 3, it is characterised in that：In the middle part of described holding piece stop collar Offer and be easy to carry out steel fibre test specimen clipping operation and the U-shaped groove of observation, clamping face position when two holding pieces clamp In on the center line of U-shaped groove.
- 5. according to the steel fibre tensioning clamping fixture described in claim 4, it is characterised in that：Described force transmission element limiting section lower surface At least two ejector springs vertically are fixedly installed, the lower end of ejector spring contacts with the upper surface of two holding pieces；Two folders It is fluted to hold the adjacent surface top setting of piece, at least one top is horizontally arranged with groove and opens spring.
- 6. according to the steel fibre tensioning clamping fixture described in claim 5, it is characterised in that：The outside of the main support and with interior spiral shell Six corners being provided with the outside of cap for fastening are screwed corresponding to line.
- A kind of 7. steel fibre tensile property test system, it is characterised in that：Including two sets of steel fibre tensioning clamping fixtures and data Harvester, the data acquisition device include load transducer, extensometer and controller, a set of steel fibre tensioning clamping fixture With tooth pull bar be used for by load transducer connection tensile testing machine jaw, the band of another set of steel fibre tensioning clamping fixture Tooth pull bar is used for the jaw for being directly connected to tensile testing machine, and two sets of steel fibre tensioning clamping fixtures are used to clamp steel fibre test specimen, For clamping extensometer on steel fibre test specimen, the signal output part of load transducer and the signal output part of extensometer connect control respectively The first signal input part and secondary signal input of device processed, the signal output part of controller are used to connect computer；Described Steel fibre tensioning clamping fixture, including main support, load transmission mechanism and steel fibre specimen holder retaining mechanism；The main support It is provided centrally with penetrating the square pilot hole of upper surface and lower surface, is provided with above square pilot hole both sides with main support disjunctor Two limb arms；The load transmission mechanism include square column type with tooth pull bar, ensure the limiting plate with tooth pull bar linear movement, anti- Off-gear plate, gear-driven assembly and screw cap；Limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, spacing Plate is provided centrally with square pilot hole, and band tooth pull bar is provided with pilot hole, and band tooth pull bar lower end disjunctor is provided with for preventing Depart from the anticreep baffle plate of pilot hole when stop-band tooth pull bar moves up, band tooth pull bar engages with gear-driven assembly, gear-driven assembly Engaged with screwing cap, it is the tubular structure for being set in the upper and lower ends opening on the outside of two limb arms to screw cap, screws cap and two Limb arm is connected through a screw thread, and is protruded from tooth pull bar by screwing the opening of cap upper end and is screwed cap, when band tooth pull bar moves down, band tooth The top of pull bar protrudes from the upper end for screwing cap all the time；Force transmission element of the steel fibre specimen holder retaining mechanism including T fonts, The holding piece stop collar and holding piece for the structure of falling square cone, force transmission element includes the top plate on top and the limiting section of bottom, spacing Portion include with the cylindricality web being fixedly connected among top plate lower surface and the square limb post being connected respectively with top plate lower surface both sides, The upper surface edge of top plate contacts with screwing the lower surface of cap, and the length of top plate is more than the internal diameter for screwing cap lower end, force transmission element Top plate linear slide up and down in the gap that two limb arms are formed, the limiting section of force transmission element is in the square pilot hole on main support Upper and lower linear slide；The spacing cover conjoined of holding piece is arranged on the lower end of main support, is set in holding piece stop collar and main support The limition orientation hole that the square pilot hole at center is connected, two holding pieces is provided with limition orientation hole, under holding piece includes The specimen holder portion of tong-like and the connecting portion of upper end square cone are held, the lower end that clamping part lower end protrudes from holding piece stop collar is opened Mouthful, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, and the limb post lower end of force transmission element is provided with The inclined-plane being engaged with the conical surface of the connecting portion of holding piece, the conical surfaces of the two holding piece connecting portions limb with corresponding force transmission element respectively The lower surface contact of post, force transmission element applies pressure by two limb posts to corresponding holding piece, and drives two holding pieces close And clamp steel fibre test specimen.
- 8. steel fibre tensile property test system according to claim 7, it is characterised in that：Described steel fibre tensioning folder The gear-driven assembly held in fixture includes vertical force transmission shaft locating rack, vertical force transmission shaft, vertical power transmission shaft transmission gear, transverse direction The pass force crossly axle locating rack of force transmission shaft tumbler gear, pass force crossly axle and two groups for limiting pass force crossly shaft position, every group Pass force crossly axle locating rack includes being separately positioned on two pass force crossly axles positioning subrack with tooth pull bar both sides, and two groups laterally pass Power axle locating rack is vertically provided on the limb arm between two limiting plates, and horizontal stroke is provided with each pass force crossly axle positioning subrack To force transmission shaft, and pass force crossly axle contacts with the band tooth pull bar of respective side, and pass force crossly axle turns with pass force crossly axle positioning subrack Dynamic connection, pass force crossly axle are provided with the gear teeth being meshed with the driving cog on tooth pull bar with the position being in contact with tooth pull bar, One end of pass force crossly axle is provided with pass force crossly axle tumbler gear；Between two limiting plates with pass force crossly axle tumbler gear pair The position answered is provided with vertical force transmission shaft locating rack, and vertical force transmission shaft is rotatablely connected with vertical force transmission shaft locating rack, vertical to pass Position corresponding with pass force crossly axle tumbler gear is provided with vertical power transmission shaft transmission gear on power axle；Cap madial wall is screwed to be provided with What is be engaged with vertical power transmission shaft transmission gear vertically screws tooth, screws and internal thread is set on the madial wall of cap bottom, two Limb facies lateralis brachii is provided with and screwed the external screw thread of cap screw-internal thread fit.
- 9. the steel fibre tensile property test system according to claim 7 or 8, it is characterised in that：Described band tooth pull bar Upper end disjunctor is provided with ball pivot nest, and ball pivot head is provided with ball pivot nest, and ball pivot head upper end is fixedly installed tension rod.
- 10. steel fibre tensile property test system according to claim 9, it is characterised in that：Described holding piece is spacing Set middle part, which offers, to be easy to carry out steel fibre test specimen clipping operation and the U-shaped groove of observation, folder when two holding pieces clamp Face is held to be located on the center line of U-shaped groove.
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| CN201610027705.1A CN105486592B (en) | 2016-01-15 | 2016-01-15 | A kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system |
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| CN201610027705.1A CN105486592B (en) | 2016-01-15 | 2016-01-15 | A kind of steel fibre tensioning clamping fixture and steel fibre tensile property test system |
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| CN106568650B (en) * | 2016-11-09 | 2019-01-18 | 江苏法尔胜研发中心有限公司 | A kind of carbon fiber composite reinforcement stress relaxation ability test method |
| CN107389454B (en) * | 2017-09-04 | 2023-06-16 | 桂林电子科技大学 | Composite fracture test device suitable for test pieces with various shapes and sizes |
| CN109632285B (en) * | 2019-02-25 | 2020-06-19 | 北京航空航天大学 | Turbine blade high temperature fatigue test anchor clamps |
| CN109655333B (en) * | 2019-02-25 | 2020-05-22 | 北京航空航天大学 | Tensile-bending composite fatigue test fixture for flat test piece |
| CN111089168B (en) * | 2019-12-19 | 2022-04-01 | 西北核技术研究院 | Anti-drop tensile end structure of glass fiber reinforced plastic pull rod |
| CN112255111B (en) * | 2020-09-14 | 2023-04-14 | 中国航发北京航空材料研究院 | Miniature loading device for DVC method test under ultralow temperature condition |
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