CN105486592A - Steel fiber tensioning and clamping fixture and steel fiber tensile strength testing system - Google Patents
Steel fiber tensioning and clamping fixture and steel fiber tensile strength testing system Download PDFInfo
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- CN105486592A CN105486592A CN201610027705.1A CN201610027705A CN105486592A CN 105486592 A CN105486592 A CN 105486592A CN 201610027705 A CN201610027705 A CN 201610027705A CN 105486592 A CN105486592 A CN 105486592A
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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
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/026—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
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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
- G01N2203/0458—Chucks, fixtures, jaws, holders or anvils characterised by their material
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a steel fiber tensioning and clamping fixture and a steel fiber tensile strength testing system. The steel fiber tensioning and clamping fixture comprises a main bracket, a load transmission mechanism and a steel fiber test piece clamping and locking mechanism, and clamping pieces can effectively clamp and tension a steel fiber test piece in the tensioning process; the steel fiber tensile strength testing system comprises two sets of steel fiber tensioning and clamping fixtures and a data acquisition device, the data acquisition device comprises a load sensor, an extensometer and a controller, the two sets of steel fiber tensioning and clamping fixtures are used for clamping the steel fiber test piece, the extensometer is arranged on the steel fiber test piece, output ends of the load sensor and the extensometer are connected with two input ends of the controller, and an output end of the controller is connected with a computer. According to the steel fiber tensioning and clamping fixture and the steel fiber tensile strength testing system, the tensile strength and the deformation parameters of steel fibers as well as the stress-strain complete curve in the steel fiber breakage process can be accurately tested.
Description
Technical field
The present invention relates to engineering detecting experimental technique field, particularly relate to a kind of steel fibre stretch-draw clamping fixture and steel fibre tensile property test macro.
Background technology
Steel fiber reinforced concrete be by short thin steel fibre equably random distribution in normal concrete matrix, between concrete substrate and aggregate, play " crane span structure " effect, make concrete material be tending towards isotropy and a kind of Novel multi-phase compound substance of being formed.The steel fibre of these random distributions effectively can hinder the expansion of inside concrete microfracture and the formation of macroscopic fracture, the concrete tension of remarkable improvement, bending resistance, shock resistance and anti-fatigue performance, there is good ductility and toughness, and the performance of these excellent properties of steel fiber reinforced concrete depends on the tensile strength of steel fibre relative to concrete substrate to a great extent, therefore, when carrying out design and devdlop to steel fiber reinforced concrete material, the tensile strength of steel fibre and distortion (or elastic modulus) parameter are important indicator and the foundation of reasonable selection steel fibre.But for a long time, owing to lacking corresponding test unit, especially lack the tension clamp that can realize effectively clamping to steel fibre, make the tensile property of steel fibre be difficult to direct acquisition.In reality, the parameters of steel fibre tensile property obtains often by the tensile test method of the tensile test piece its mother metal being made standard conveniently material, but because dissimilar steel fibre adopts different production technologies respectively, technological process produces certain influence by the tensile property of steel fibre finished product, thus cause the tensile property difference to some extent of steel fibre and its mother metal, this brings adverse effect to the reasonable selection of steel fibre, especially cuts off type steel fibers to high tensile steel wire.Therefore, for accurately understanding the tensile property of steel fibre self, be necessary to develop a kind of simple proving installation be suitable for, for the scientific research of steel fiber reinforced concrete material and engineer applied provide reliable guarantee.
Summary of the invention
The object of this invention is to provide a kind of steel fibre stretch-draw clamping fixture and steel fibre tensile property test macro, can accurate tested steel fibre tensile strength and deformation performance parameter.
The technical solution used in the present invention is:
A kind of steel fibre stretch-draw clamping fixture of the present invention, comprises main support, load transmission mechanism and steel fibre specimen holder latch mechanism;
Described main support center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support disjunctor is provided with two limb arms;
Described load transmission mechanism comprises the band tooth pull bar of square column type, limiting plate, anticreep baffle plate, the gear-driven assembly of guarantee band tooth pull bar linear movement and screws cap, limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, limiting plate center is provided with square pilot hole, band tooth pull bar is provided with in pilot hole, the anticreep baffle plate of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar moving with tooth pull bar lower end disjunctor, band tooth pull bar engages with gear-driven assembly, gear-driven assembly with screw cap and engage, screw the tubular structure that cap is the both ends open be up and down set in outside two limb arms, screw cap and two limb arms are threaded connection, to be protruded from by the opening screwing cap upper end with tooth pull bar and screw cap, when band tooth pull bar moves down, top with tooth pull bar protrudes from the upper end screwing cap all the time,
Described steel fibre specimen holder latch mechanism comprises the force transmission element of T font, the holding piece stop collar of the structure of falling square cone and holding piece, force transmission element comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap, the length of top board is greater than the internal diameter screwing cap lower end, top board upper and lower linear slide in the gap that two limb arms are formed of force transmission element, linear slide up and down in the limiting section of the force transmission element square pilot hole on main support, described holding piece stop collar disjunctor is arranged on the lower end of main support, the spacing pilot hole be connected with the square pilot hole at main support center is established in holding piece stop collar, two holding pieces are provided with in spacing pilot hole, holding piece comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, the limb post lower end of force transmission element is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece, the conical surface of two holding piece connecting portions contacts with the lower surface of the limb post of corresponding force transmission element respectively, force transmission element is by the holding piece applying pressure of two limb posts to correspondence, and drive two holding pieces close and clamp steel fibre test specimen.
Described gear-driven assembly comprises vertical force transmission shaft locating rack, vertical force transmission shaft, vertical force transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and two groups are for limiting the pass force crossly axle locating rack of pass force crossly shaft position, often organize pass force crossly axle locating rack and comprise two the pass force crossly axle location subracks being separately positioned on band tooth pull bar both sides, two groups of pass force crossly axle locating racks are vertically arranged on the limb arm between two limiting plates, pass force crossly axle is provided with in the subrack of each pass force crossly axle location, and pass force crossly axle contacts with the band tooth pull bar of respective side, pass force crossly axle and pass force crossly axle are located subrack and are rotationally connected, the position that pass force crossly axle contacts with band tooth pull bar is provided with the gear teeth be meshed with the driving cog on tooth pull bar, one end of pass force crossly axle is provided with pass force crossly axle tumbler gear, position corresponding with pass force crossly axle tumbler gear between two limiting plates is provided with vertical force transmission shaft locating rack, vertical force transmission shaft and vertical force transmission shaft locating rack are rotationally connected, and position corresponding with pass force crossly axle tumbler gear on vertical force transmission shaft is provided with vertical force transmission shaft transmission gear, screw cap madial wall be provided with match with vertical force transmission shaft transmission gear vertically screw tooth, the madial wall screwing cap bottom arranges internal thread, and two limb facies lateralis brachiis are provided with and the external thread screwing cap screw-internal thread fit.
Described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and be provided with ball pivot head in ball pivot nest, ball pivot head upper end is fixedly installed tension rod.
Offer the U-shaped groove of being convenient to steel fibre test specimen be carried out to clipping operation and observation in the middle part of described holding piece stop collar, clamping face during two holding piece clampings is positioned 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, and the lower end of ejector spring contacts with the upper surface of two holding pieces; The adjacent surface top of two holding pieces is provided with groove, is horizontally arranged with at least one and backs down spring in groove.
Outside and the outside that screw cap corresponding with internal thread of described main support are provided with for six fastening corners.
Steel fibre tensile property test macro of the present invention, comprise two cover steel fibre stretch-draw clamping fixture and data collectors, described data collector comprises load transducer, extensometer and controller, the band tooth pull bar of a set of steel fibre stretch-draw clamping fixture is used for the jaw being connected tension tester by load transducer, the band tooth pull bar of another set of steel fibre stretch-draw clamping fixture is used for the jaw directly connecting tension tester, two cover steel fibre stretch-draw clamping fixtures are for clamping steel fibre test specimen, clamping extensometer is on steel fibre test specimen, first signal input part of the signal output part of load transducer and the signal output part difference connection control device of extensometer and secondary signal input end, the signal output part of controller is for connecting computing machine, described steel fibre stretch-draw clamping fixture, comprises main support, load transmission mechanism and steel fibre specimen holder latch mechanism, described main support center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support disjunctor is provided with two limb arms, described load transmission mechanism comprises the band tooth pull bar of square column type, limiting plate, anticreep baffle plate, the gear-driven assembly of guarantee band tooth pull bar linear movement and screws cap, limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, limiting plate center is provided with square pilot hole, band tooth pull bar is provided with in pilot hole, the anticreep baffle plate of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar moving with tooth pull bar lower end disjunctor, band tooth pull bar engages with gear-driven assembly, gear-driven assembly with screw cap and engage, screw the tubular structure that cap is the both ends open be up and down set in outside two limb arms, screw cap and two limb arms are threaded connection, to be protruded from by the opening screwing cap upper end with tooth pull bar and screw cap, when band tooth pull bar moves down, top with tooth pull bar protrudes from the upper end screwing cap all the time, described steel fibre specimen holder latch mechanism comprises the force transmission element of T font, the holding piece stop collar of the structure of falling square cone and holding piece, force transmission element comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap, the length of top board is greater than the internal diameter screwing cap lower end, top board upper and lower linear slide in the gap that two limb arms are formed of force transmission element, linear slide up and down in the limiting section of the force transmission element square pilot hole on main support, described holding piece stop collar disjunctor is arranged on the lower end of main support, the spacing pilot hole be connected with the square pilot hole at main support center is established in holding piece stop collar, two holding pieces are provided with in spacing pilot hole, holding piece comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, clamping part lower end protrudes from the lower ending opening of holding piece stop collar, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, the limb post lower end of force transmission element is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece, the conical surface of two holding piece connecting portions contacts with the lower surface of the limb post of corresponding force transmission element respectively, force transmission element is by the holding piece applying pressure of two limb posts to correspondence, and drive two holding pieces close and clamp steel fibre test specimen.
Gear-driven assembly in described steel fibre stretch-draw clamping fixture comprises vertical force transmission shaft locating rack, vertical force transmission shaft, vertical force transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and two groups are for limiting the pass force crossly axle locating rack of pass force crossly shaft position, often organize pass force crossly axle locating rack and comprise two the pass force crossly axle location subracks being separately positioned on band tooth pull bar both sides, two groups of pass force crossly axle locating racks are vertically arranged on the limb arm between two limiting plates, pass force crossly axle is provided with in the subrack of each pass force crossly axle location, and pass force crossly axle contacts with the band tooth pull bar of respective side, pass force crossly axle and pass force crossly axle are located subrack and are rotationally connected, the position that pass force crossly axle contacts with band tooth pull bar is provided with the gear teeth be meshed with the driving cog on tooth pull bar, one end of pass force crossly axle is provided with pass force crossly axle tumbler gear, position corresponding with pass force crossly axle tumbler gear between two limiting plates is provided with vertical force transmission shaft locating rack, vertical force transmission shaft and vertical force transmission shaft locating rack are rotationally connected, and position corresponding with pass force crossly axle tumbler gear on vertical force transmission shaft is provided with vertical force transmission shaft transmission gear, screw cap madial wall be provided with match with vertical force transmission shaft transmission gear vertically screw tooth, the madial wall screwing cap bottom arranges internal thread, and two limb facies lateralis brachiis are provided with and the external thread screwing cap screw-internal thread fit.
Described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and be provided with ball pivot head in ball pivot nest, ball pivot head upper end is fixedly installed tension rod.
Offer the U-shaped groove of being convenient to steel fibre test specimen be carried out to clipping operation and observation in the middle part of described holding piece stop collar, clamping face during two holding piece clampings is positioned on the center line of U-shaped groove.
Steel fibre stretch-draw clamping fixture of the present invention can ensure that holding piece can increase with the increasing of outside stretching force the holding force of steel fibre test specimen, makes the clamping of holding piece to steel fibre more and more fastening in stretch-draw steel fibre test specimen process.
Being equipped with of holding piece stop collar of the present invention, holding piece and force transmission element structure, holding piece is made to screw shade main support when screwing, two holding pieces can parallel compression steel fibre test piece end, ensures steel fibre test piece end uniform force, avoids the generation that stress is concentrated.
In steel fibre stretch-draw holing clip of the present invention, inside upper and lower two limiting plates and each limb arm, the setting of upper and lower two groups of pass force crossly axles ensure that the homogeneity that the stability of band tooth pull bar when vertical sliding motion and load transmit.
In the present invention, steel fibre uniform force is guaranteed in the setting of ball pivot head, avoids the adverse effect caused test findings because centering is inaccurate occurred in clamping process.
In the present invention, the hardness of holding piece is higher than steel fibre, and material is high-speed steel, is beneficial to clamping steel fibre; Described holding piece is provided with the steel fibre anchoring tooth preventing steel fibre slippage for the clamping face clamping steel fibre test specimen, with the generation preventing steel fibre anchored end stress from concentrating.
The setting of ejector spring in steel fibre stretch-draw clamping fixture of the present invention, makes, when installing steel fibre test specimen, ejector spring can be utilized holding piece to be ejected the opening of the U-shaped groove of holding piece stop collar, be convenient to the installation to steel fibre test specimen.
Back down the setting of spring in steel fibre stretch-draw clamping fixture of the present invention, make install and unloading steel fibre test specimen time, can utilize and back down spring two holding pieces are backed down round about, be convenient to load and take out steel fibre test specimen.
Steel fibre tensile property Design of Test System of the present invention is reasonable, the accurate tested steel fiber of energy is from the load and the deformation values that are loaded into complete process of fracture, for the load-deformation full curve obtaining steel fibre rupture failure provides data basis, and structure is simple, measuring accuracy is high, is easy to promotion and implementation.
Accompanying drawing explanation
Fig. 1 is the front elevation of steel fibre stretch-draw clamping fixture cut-open view in the present invention;
Fig. 2 is the side view of steel fibre stretch-draw clamping fixture cut-open view in the present invention;
Fig. 3 is the sectional view of A-A in Fig. 1;
Fig. 4 is the structural representation of steel fibre tensile property test macro in the present invention;
Fig. 5 is the stress-strain curve of the steel fibre Tensile Fracture Process adopting steel fibre tensile property test macro of the present invention to obtain.
In figure: tension rod 1, ball pivot head 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 force transmission shaft transmission gear 8, pass force crossly axle tumbler gear 9, pass force crossly axle locating rack 10, pass force crossly axle 11, anticreep baffle plate 12, force transmission element 13, ejector spring 14, back down spring 15, steel fibre anchoring tooth 16, holding piece stop collar 17, holding piece 18, screw cap 19, limb arm 20, screw tooth 21, internal thread 22, main support 23, steel fibre test specimen 24, extensometer 25, computing machine 26, controller 27, load transducer 28.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, steel fibre stretch-draw clamping fixture, comprises main support 23, load transmission mechanism and steel fibre specimen holder latch mechanism.
Described main support 23 center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support 23 disjunctor is provided with two limb arms 20;
Described load transmission mechanism comprises the band tooth pull bar 4 of square column type, limiting plate 5, anticreep baffle plate 12, the gear-driven assembly of guarantee band tooth pull bar 4 linear movement and screws cap 19, limiting plate 5 transversal conjoined is arranged in the middle part of two limb arm 20 tops and madial wall, limiting plate 5 center is provided with square pilot hole, band tooth pull bar 4 is provided with in pilot hole, the anticreep baffle plate 12 of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar 4 moving with tooth pull bar 4 lower end disjunctor, band tooth pull bar 4 engages with gear-driven assembly, gear-driven assembly with screw cap 19 and engage, screw cap 19 for being set in the tubular structure of the both ends open up and down outside two limb arms 20, screw cap 19 and two limb arms 20 are threaded connection, to be protruded from by the opening screwing cap 19 upper end with tooth pull bar 4 and screw cap 19, when band tooth pull bar 4 moves down, top with tooth pull bar 4 protrudes from the upper end screwing cap 19 all the time.
Described steel fibre test specimen 24 clamping and locking mechanism comprises the force transmission element 13 of T font, the holding piece stop collar 17 of the structure of falling square cone and holding piece 18, force transmission element 13 comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap 19, the length of top board is greater than the internal diameter screwing cap 19 lower end, top board upper and lower linear slide in the gap that two limb arms 20 are formed of force transmission element 13, the limiting section of force transmission element 13 is being arranged on upper and lower linear slide in the square pilot hole on main support 23, described holding piece stop collar 17 disjunctor is arranged on the lower end of main support 23, the spacing pilot hole be connected with the square pilot hole at main support 23 center is established in holding piece stop collar 17, two holding pieces 18 are provided with in spacing pilot hole, holding piece 18 comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar 17, the cone angle of two holding piece 18 clamping part compositions is equal with the cone angle of holding piece stop collar 17, the lower end of the limb post of force transmission element 13 is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece 18, the conical surface of the connecting portion of two holding pieces 18 contacts with the lower surface of corresponding force transmission element 13 limb post respectively, force transmission element 13 applies pressure by two limb posts to the holding piece 18 of correspondence, and drive two holding pieces 18 close and clamp steel fibre test specimen 24.
In the present invention, being equipped with of described holding piece stop collar 17, holding piece 18 and force transmission element 13 structure, holding piece 18 is made to screw cap 19 when screwing along main support 23, force transmission element 13 applies pressure by two limb posts to the holding piece 18 of correspondence, and drive two holding pieces 18 close and clamp steel fibre test specimen 24, ensure steel fibre test specimen 24 uniform force, avoid the generation that stress is concentrated.
The outer of the top board of described holding piece 18 limited post with screw cap 19 and match, in the present embodiment, the top board employing two ends of holding piece 18 limited post are the square plate of arc, namely the width between the width of top board and two limb arms 20 of two main supports 23 is equal, and the arc size at the length direction two ends of top board is consistent with screwing cap 19 external diameter radian.The hardness of described holding piece 18 is higher than steel fibre, and material is high-speed steel, is beneficial to clamping steel fibre; Described holding piece 18 is provided with the steel fibre anchoring tooth preventing steel fibre slippage for the clamping face clamping steel fibre test specimen 24, described steel fibre anchoring tooth is a kind of closely-pitched line, with the generation preventing stress from concentrating.
Described gear-driven assembly comprises vertical force transmission shaft locating rack 6, vertical force transmission shaft 7, vertical force transmission shaft 7 transmission gear 8, pass force crossly axle tumbler gear 9, pass force crossly axle 11 and two groups are for limiting the pass force crossly axle locating rack 10 of pass force crossly axle 11 position, often organize pass force crossly axle locating rack 10 to comprise two the pass force crossly axles 11 being separately positioned on band tooth pull bar 4 both sides and locate subrack, two groups of pass force crossly axle locating racks 10 are vertically arranged on the limb arm 20 between two limiting plates 5, each pass force crossly axle 11 is located 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, pass force crossly axle 11 and pass force crossly axle 11 are located subrack and are rotationally connected, the position that pass force crossly axle 11 contacts with band tooth pull bar 4 is provided with the gear teeth be meshed with the driving cog on tooth pull bar 4, one end of pass force crossly axle 11 is provided with pass force crossly axle tumbler gear 9, position corresponding with pass force crossly axle tumbler gear 9 between two limiting plates 5 is provided with vertical force transmission shaft locating rack 6, vertical force transmission shaft 7 is rotationally connected with vertical force transmission shaft locating rack 6, and position corresponding with pass force crossly axle tumbler gear 9 on vertical force transmission shaft 7 is provided with vertical force transmission shaft 7 transmission gear 8, screw cap 19 madial wall be provided with match with vertical force transmission shaft 7 transmission gear 8 vertically screw tooth 21, the madial wall screwing cap 19 bottom arranges internal thread 22, and two limb arm 20 lateral surfaces are provided with the external thread coordinated with the internal thread 22 screwing cap 19.In the present embodiment, the described diameter screwing the madial wall upper end of cap 19 screwing tooth 21 place screwing cap 19 is greater than the diameter that internal thread 22 place screwing cap 19 screws the madial wall bottom of cap 19, and it is fastening that the load that the top be conducive to because screwing cap 19 screws and transmits makes the helicitic texture of the bottom screwing cap 19 obtain.In the present embodiment, pass force crossly axle tumbler gear 9 and vertical force transmission shaft 7 tumbler gear adopt bevel gear, horizontally rotating of pass force crossly axle 11 can be changed mutually with the vertical rotating of vertical force transmission shaft 7.
Described band tooth pull bar 4 upper end disjunctor is provided with ball pivot nest 3, and be provided with ball pivot head 2 in ball pivot nest 3, ball pivot head 2 upper end is fixedly installed tension rod 1.In the present invention, steel fibre uniform force is guaranteed in the setting of ball pivot head 2, avoids the adverse effect caused test findings because centering is inaccurate occurred in clamping process.
The U-shaped groove of being convenient to steel fibre test specimen 24 be carried out to clipping operation and observation is offered in the middle part of described holding piece stop collar 17.When two holding pieces 18 clamp steel fibre test specimen 24, two accommodate the clamping face of sheet 18 and the centerline parallel of U-shaped groove.
Described force transmission element 13 limiting section lower surface is vertically fixedly installed at least two ejector springs 14, and the lower end of ejector spring 14 contacts with the upper surface of two holding pieces 18; The adjacent surface top of two holding pieces 18 is provided with groove, is horizontally arranged with at least one and backs down spring 15 in groove.The setting of ejector spring 14 in steel fibre stretch-draw clamping fixture of the present invention, makes, when installing steel fibre test specimen 24, can utilize ejector spring 14 that holding piece 18 is ejected the tapered opening of holding piece stop collar 17, be convenient to the installation to steel fibre test specimen 24.Back down the setting of spring 15 in steel fibre stretch-draw clamping fixture of the present invention, make install and unloading steel fibre test specimen 24 time, can utilize and back down spring 15 two holding pieces 18 are backed down round about, be convenient to load and take out steel fibre test specimen 24.
The outside of described main support 23 and the outside that screw cap 19 corresponding with internal thread 22 are provided with for six fastening corners, form the fastening structure of screw bolt and nut formula, are convenient to adopt the fastened tools such as spanner to carry out screwing operations;
As shown in Figure 4, steel fibre tensile property test macro of the present invention, comprise two cover steel fibre stretch-draw clamping fixture and data collectors, described data collector comprises load transducer 28, extensometer 25 and controller 27, the band tooth pull bar 4 of a set of steel fibre stretch-draw clamping fixture is for connecting the jaw of tension tester by load transducer 28, the band tooth pull bar 4 of another set of steel fibre stretch-draw clamping fixture is for directly connecting the jaw of tension tester, two cover steel fibre stretch-draw clamping fixtures are for clamping steel fibre test specimen 24, extensometer 25 is clamped on steel fibre test specimen 24, first signal input part of the signal output part of load transducer 28 and the signal output part difference connection control device 27 of extensometer 25 and secondary signal input end, the signal output part of controller 27 is for connecting computing machine 26, described steel fibre stretch-draw clamping fixture, comprises main support 23, load transmission mechanism and steel fibre test specimen 24 clamping and locking mechanism, described main support 23 center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support 23 disjunctor is provided with two limb arms 20, described load transmission mechanism comprises the band tooth pull bar 4 of square column type, limiting plate 5, anticreep baffle plate 12, the gear-driven assembly of guarantee band tooth pull bar 4 linear movement and screws cap 19, limiting plate 5 transversal conjoined is arranged in the middle part of two limb arm 20 tops and madial wall, limiting plate 5 center is provided with square pilot hole, band tooth pull bar 4 is provided with in pilot hole, the anticreep baffle plate 12 of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar 4 moving with tooth pull bar 4 lower end disjunctor, band tooth pull bar 4 engages with gear-driven assembly, gear-driven assembly with screw cap 19 and engage, screw cap 19 for being set in the tubular structure of the both ends open up and down outside two limb arms 20, screw cap 19 and two limb arms 20 are threaded connection, to be protruded from by the opening screwing cap 19 upper end with tooth pull bar 4 and screw cap 19, when band tooth pull bar 4 moves down, top with tooth pull bar 4 protrudes from the upper end screwing cap 19 all the time.Described steel fibre test specimen 24 clamping and locking mechanism comprises the force transmission element 13 of T font, the holding piece stop collar 17 of the structure of falling square cone and holding piece 18, force transmission element 13 comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap 19, the length of top board is greater than the internal diameter screwing cap 19 lower end, top board upper and lower linear slide in the gap that two limb arms 20 are formed of force transmission element 13, the limiting section of force transmission element 13 is being arranged on upper and lower linear slide in the square pilot hole on main support 23, described holding piece stop collar 17 disjunctor is arranged on the lower end of main support 23, the spacing pilot hole be connected with the square pilot hole at main support 23 center is established in holding piece stop collar 17, two holding pieces 18 are provided with in spacing pilot hole, holding piece 18 comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar 17, the cone angle of two holding piece 18 clamping part compositions is equal with the cone angle of holding piece stop collar 17, the lower end of the limb post of force transmission element 13 is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece 18, the conical surface of the connecting portion of two holding pieces 18 contacts with the lower surface of corresponding force transmission element 13 limb post respectively, force transmission element 13 applies pressure by two limb posts to the holding piece 18 of correspondence, and drive two holding pieces 18 close and clamp steel fibre test specimen 24.
Described gear-driven assembly comprises vertical force transmission shaft locating rack 6, vertical force transmission shaft 7, vertical force transmission shaft 7 transmission gear 8, pass force crossly axle tumbler gear 9, pass force crossly axle 11 and two groups are for limiting the pass force crossly axle locating rack 10 of pass force crossly axle 11 position, often organize pass force crossly axle locating rack 10 to comprise two the pass force crossly axles 11 being separately positioned on band tooth pull bar 4 both sides and locate subrack, two groups of pass force crossly axle locating racks 10 are vertically arranged on the limb arm 20 between two limiting plates 5, each pass force crossly axle 11 is located 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, pass force crossly axle 11 and pass force crossly axle 11 are located subrack and are rotationally connected, the position that pass force crossly axle 11 contacts with band tooth pull bar 4 is provided with the gear teeth be meshed with the driving cog on tooth pull bar 4, one end of pass force crossly axle 11 is provided with pass force crossly axle tumbler gear 9, position corresponding with pass force crossly axle tumbler gear 9 between two limiting plates 5 is provided with vertical force transmission shaft locating rack 6, vertical force transmission shaft 7 is rotationally connected with vertical force transmission shaft locating rack 6, and position corresponding with pass force crossly axle tumbler gear 9 on vertical force transmission shaft 7 is provided with vertical force transmission shaft 7 transmission gear 8, screw cap 19 madial wall be provided with match with vertical force transmission shaft 7 transmission gear 8 vertically screw tooth 21, the madial wall screwing cap 19 bottom arranges internal thread 22, and two limb arm 20 lateral surfaces are provided with the external thread coordinated with the internal thread 22 screwing cap 19.In the present embodiment, the described diameter screwing the madial wall upper end of cap 19 screwing tooth 21 place screwing cap 19 is greater than the diameter that internal thread 22 place screwing cap 19 screws the madial wall bottom of cap 19, and it is fastening that the load that the top be conducive to because screwing cap 19 screws and transmits makes the helicitic texture of the bottom screwing cap 19 obtain.In the present embodiment, pass force crossly axle tumbler gear 9 and vertical force transmission shaft 7 tumbler gear adopt bevel gear, horizontally rotating of pass force crossly axle 11 can be changed mutually with the vertical rotating of vertical force transmission shaft 7.
Controller 27 in the present invention comprises amplifier, A/D converter, microprocessor (CPU), storer, communication interface circuit etc., is prior art, repeats no more.
When carrying out the tensile test of steel fibre, the tension rod 1 of a set of steel fibre stretch-draw clamping fixture in steel fibre tensile property test macro of the present invention is threaded connection with one end of load transducer 28, the other end of load transducer 28 is threaded with the tension rod 1 of the jaw for being connected tension tester, and the tension rod 1 of another set of steel fibre stretch-draw clamping fixture is directly connected with the jaw of tension tester.In steel fibre tensile property test macro of the present invention, load transducer 28 passes to controller 27 by the simulating signal collected respectively with extensometer 25, controller 27 passes to computing machine 26 after converting simulating signal to digital signal, and the data transmitted also preserved by computing machine 26 by software records.In the present embodiment, a kind of tensile property of cold-drawn low-carbon cut-out type steel fibers is tested, the basic physical index of tested steel fibre is as shown in table 1, the result that the present embodiment is tested one group of steel fibre is as shown in table 2, and the stress-strain curve of the steel fibre Tensile Fracture Process obtained as shown in Figure 5.
Every physical index of table 1 steel fibre
Table 2 steel fibre tensile breakage damage test result
As can be seen from the test findings of table 2 and Fig. 5, utilize steel fibre tensile property test macro of the present invention conveniently can obtain the stress-strain curve of steel fibre test specimen 24 tensile property process of the test, survey one group of steel fibre test specimen 24 the ratio percent of ultimate strength standard variance and mean value be 3.8%, the ratio percent of ultimate strain standard variance and mean value is 11.5%.
The present embodiment not does any pro forma restriction to the shape, material, structure etc. of invention; every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all belong to the protection domain of technical solution of the present invention.
Claims (10)
1. a steel fibre stretch-draw clamping fixture, is characterized in that: comprise main support, load transmission mechanism and steel fibre specimen holder latch mechanism;
Described main support center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support disjunctor is provided with two limb arms;
Described load transmission mechanism comprises the band tooth pull bar of square column type, limiting plate, anticreep baffle plate, the gear-driven assembly of guarantee band tooth pull bar linear movement and screws cap, limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, limiting plate center is provided with square pilot hole, band tooth pull bar is provided with in pilot hole, the anticreep baffle plate of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar moving with tooth pull bar lower end disjunctor, band tooth pull bar engages with gear-driven assembly, gear-driven assembly with screw cap and engage, screw the tubular structure that cap is the both ends open be up and down set in outside two limb arms, screw cap and two limb arms are threaded connection, to be protruded from by the opening screwing cap upper end with tooth pull bar and screw cap, when band tooth pull bar moves down, top with tooth pull bar protrudes from the upper end screwing cap all the time,
Described steel fibre specimen holder latch mechanism comprises the force transmission element of T font, the holding piece stop collar of the structure of falling square cone and holding piece, force transmission element comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap, the length of top board is greater than the internal diameter screwing cap lower end, top board upper and lower linear slide in the gap that two limb arms are formed of force transmission element, linear slide up and down in the limiting section of the force transmission element square pilot hole on main support, described holding piece stop collar disjunctor is arranged on the lower end of main support, the spacing pilot hole be connected with the square pilot hole at main support center is established in holding piece stop collar, two holding pieces are provided with in spacing pilot hole, holding piece comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, specimen holder subordinate distal process is for the lower ending opening of holding piece stop collar, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, the limb post lower end of force transmission element is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece, the conical surface of two holding piece connecting portions contacts with the lower surface of the limb post of corresponding force transmission element respectively, force transmission element is by the holding piece applying pressure of two limb posts to correspondence, and drive two holding pieces close and clamp steel fibre test specimen.
2. steel fibre stretch-draw clamping fixture according to claim 1, it is characterized in that: described gear-driven assembly comprises vertical force transmission shaft locating rack, vertical force transmission shaft, vertical force transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and two groups are for limiting the pass force crossly axle locating rack of pass force crossly shaft position, often organize pass force crossly axle locating rack and comprise two the pass force crossly axle location subracks being separately positioned on band tooth pull bar both sides, two groups of pass force crossly axle locating racks are vertically arranged on the limb arm between two limiting plates, pass force crossly axle is provided with in the subrack of each pass force crossly axle location, and pass force crossly axle contacts with the band tooth pull bar of respective side, pass force crossly axle and pass force crossly axle are located subrack and are rotationally connected, the position that pass force crossly axle contacts with band tooth pull bar is provided with the gear teeth be meshed with the driving cog on tooth pull bar, one end of pass force crossly axle is provided with pass force crossly axle tumbler gear, position corresponding with pass force crossly axle tumbler gear between two limiting plates is provided with vertical force transmission shaft locating rack, vertical force transmission shaft and vertical force transmission shaft locating rack are rotationally connected, and position corresponding with pass force crossly axle tumbler gear on vertical force transmission shaft is provided with vertical force transmission shaft transmission gear, screw cap madial wall be provided with match with vertical force transmission shaft transmission gear vertically screw tooth, the madial wall screwing cap bottom arranges internal thread, and two limb facies lateralis brachiis are provided with and the external thread screwing cap screw-internal thread fit.
3. steel fibre stretch-draw clamping fixture according to claim 1 and 2, is characterized in that: described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and be provided with ball pivot head in ball pivot nest, ball pivot head upper end is fixedly installed tension rod.
4. steel fibre stretch-draw clamping fixture according to claim 3, it is characterized in that: offer the U-shaped groove of being convenient to steel fibre test specimen be carried out to clipping operation and observation in the middle part of described holding piece stop collar, clamping face during two holding piece clampings is positioned on the center line of U-shaped groove.
5. according to steel fibre stretch-draw clamping fixture according to claim 4, it is characterized in that: described force transmission element limiting section lower surface is vertically fixedly installed at least two ejector springs, and the lower end of ejector spring contacts with the upper surface of two holding pieces; The adjacent surface top of two holding pieces is provided with groove, is horizontally arranged with at least one and backs down spring in groove.
6. according to steel fibre stretch-draw clamping fixture according to claim 5, it is characterized in that: outside and the outside that screw cap corresponding with internal thread of described main support are provided with for six fastening corners.
7. a steel fibre tensile property test macro, it is characterized in that: comprise two cover steel fibre stretch-draw clamping fixture and data collectors, described data collector comprises load transducer, extensometer and controller, the band tooth pull bar of a set of steel fibre stretch-draw clamping fixture is used for the jaw being connected tension tester by load transducer, the band tooth pull bar of another set of steel fibre stretch-draw clamping fixture is used for the jaw directly connecting tension tester, two cover steel fibre stretch-draw clamping fixtures are for clamping steel fibre test specimen, clamping extensometer is on steel fibre test specimen, first signal input part of the signal output part of load transducer and the signal output part difference connection control device of extensometer and secondary signal input end, the signal output part of controller is for connecting computing machine, described steel fibre stretch-draw clamping fixture, comprises main support, load transmission mechanism and steel fibre specimen holder latch mechanism, described main support center is provided with the square pilot hole of through upper surface and lower surface, above square pilot hole both sides, main support disjunctor is provided with two limb arms, described load transmission mechanism comprises the band tooth pull bar of square column type, limiting plate, anticreep baffle plate, the gear-driven assembly of guarantee band tooth pull bar linear movement and screws cap, limiting plate transversal conjoined is arranged in the middle part of two limb arm tops and madial wall, limiting plate center is provided with square pilot hole, band tooth pull bar is provided with in pilot hole, the anticreep baffle plate of pilot hole is departed from when being provided with for preventing from being with and tooth pull bar moving with tooth pull bar lower end disjunctor, band tooth pull bar engages with gear-driven assembly, gear-driven assembly with screw cap and engage, screw the tubular structure that cap is the both ends open be up and down set in outside two limb arms, screw cap and two limb arms are threaded connection, to be protruded from by the opening screwing cap upper end with tooth pull bar and screw cap, when band tooth pull bar moves down, top with tooth pull bar protrudes from the upper end screwing cap all the time, described steel fibre specimen holder latch mechanism comprises the force transmission element of T font, the holding piece stop collar of the structure of falling square cone and holding piece, force transmission element comprises the top board on top and the limiting section of bottom, limiting section comprises and the cylindricality web be fixedly connected with in the middle of top board lower surface and the square limb post be connected with both sides, top board lower surface respectively, the edge, upper surface of top board contacts with the lower surface screwing cap, the length of top board is greater than the internal diameter screwing cap lower end, top board upper and lower linear slide in the gap that two limb arms are formed of force transmission element, linear slide up and down in the limiting section of the force transmission element square pilot hole on main support, described holding piece stop collar disjunctor is arranged on the lower end of main support, the spacing pilot hole be connected with the square pilot hole at main support center is established in holding piece stop collar, two holding pieces are provided with in spacing pilot hole, holding piece comprises the specimen holder portion of lower end tong-like and the connecting portion of upper end square cone, clamping part lower end protrudes from the lower ending opening of holding piece stop collar, the cone angle of two holding piece clamping part compositions is equal with the cone angle of holding piece stop collar, the limb post lower end of force transmission element is provided with the inclined-plane matched with the conical surface of the connecting portion of holding piece, the conical surface of two holding piece connecting portions contacts with the lower surface of the limb post of corresponding force transmission element respectively, force transmission element is by the holding piece applying pressure of two limb posts to correspondence, and drive two holding pieces close and clamp steel fibre test specimen.
8. steel fibre tensile property test macro according to claim 7, it is characterized in that: the gear-driven assembly in described steel fibre stretch-draw clamping fixture comprises vertical force transmission shaft locating rack, vertical force transmission shaft, vertical force transmission shaft transmission gear, pass force crossly axle tumbler gear, pass force crossly axle and two groups are for limiting the pass force crossly axle locating rack of pass force crossly shaft position, often organize pass force crossly axle locating rack and comprise two the pass force crossly axle location subracks being separately positioned on band tooth pull bar both sides, two groups of pass force crossly axle locating racks are vertically arranged on the limb arm between two limiting plates, pass force crossly axle is provided with in the subrack of each pass force crossly axle location, and pass force crossly axle contacts with the band tooth pull bar of respective side, pass force crossly axle and pass force crossly axle are located subrack and are rotationally connected, the position that pass force crossly axle contacts with band tooth pull bar is provided with the gear teeth be meshed with the driving cog on tooth pull bar, one end of pass force crossly axle is provided with pass force crossly axle tumbler gear, position corresponding with pass force crossly axle tumbler gear between two limiting plates is provided with vertical force transmission shaft locating rack, vertical force transmission shaft and vertical force transmission shaft locating rack are rotationally connected, and position corresponding with pass force crossly axle tumbler gear on vertical force transmission shaft is provided with vertical force transmission shaft transmission gear, screw cap madial wall be provided with match with vertical force transmission shaft transmission gear vertically screw tooth, the madial wall screwing cap bottom arranges internal thread, and two limb facies lateralis brachiis are provided with and the external thread screwing cap screw-internal thread fit.
9. the steel fibre tensile property test macro according to claim 7 or 8, is characterized in that: described band tooth pull bar upper end disjunctor is provided with ball pivot nest, and be provided with ball pivot head in ball pivot nest, ball pivot head upper end is fixedly installed tension rod.
10. steel fibre tensile property test macro according to claim 9, it is characterized in that: offer the U-shaped groove of being convenient to steel fibre test specimen be carried out to clipping operation and observation in the middle part of described holding piece stop collar, clamping face during two holding piece clampings is positioned 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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Cited By (6)
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| CN106568650A (en) * | 2016-11-09 | 2017-04-19 | 江苏法尔胜技术开发中心有限公司 | Carbon fiber composite reinforcement bar stress relaxation performance test method |
| CN107389454A (en) * | 2017-09-04 | 2017-11-24 | 桂林电子科技大学 | A kind of composite rupture test device suitable for various shapes size test specimen |
| CN109632285A (en) * | 2019-02-25 | 2019-04-16 | 北京航空航天大学 | A kind of turbo blade high temperature fatigue test clamp |
| CN109655333A (en) * | 2019-02-25 | 2019-04-19 | 北京航空航天大学 | A kind of flat test piece stretches-is bent composite fatigue test fixture |
| CN111089168A (en) * | 2019-12-19 | 2020-05-01 | 西北核技术研究院 | Anti-drop tensile end structure of glass fiber reinforced plastic pull rod |
| CN112255111A (en) * | 2020-09-14 | 2021-01-22 | 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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| CN111089168A (en) * | 2019-12-19 | 2020-05-01 | 西北核技术研究院 | Anti-drop tensile end structure of glass fiber reinforced plastic pull rod |
| CN112255111A (en) * | 2020-09-14 | 2021-01-22 | 中国航发北京航空材料研究院 | Miniature loading device for DVC method test under ultralow temperature condition |
| 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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| CN105486592B (en) | 2018-02-09 |
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