CN214309878U - Clamping device for testing fatigue performance of twisted steel - Google Patents

Clamping device for testing fatigue performance of twisted steel Download PDF

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Publication number
CN214309878U
CN214309878U CN202120127513.4U CN202120127513U CN214309878U CN 214309878 U CN214309878 U CN 214309878U CN 202120127513 U CN202120127513 U CN 202120127513U CN 214309878 U CN214309878 U CN 214309878U
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Prior art keywords
clamping
cavity
fatigue
twisted steel
connector
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CN202120127513.4U
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Inventor
毛海波
洪涛
张平萍
史铭楷
孙兵团
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Sinosteel Zhengzhou Metal Products Research Institute Co ltd
Sinosteel Nanjing New Material Research Institute Co Ltd
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Sinosteel Zhengzhou Metal Products Research Institute Co ltd
Sinosteel Nanjing New Material Research Institute Co Ltd
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Abstract

The utility model discloses a test twisted steel fatigue performance's clamping device belongs to fatigue test's technical field. The utility model discloses a two sets of symmetry centre gripping are at the both ends of twisted steel sample (1), and by from interior to the clamping device that constitutes of nested clamping piece (2), taper sleeve (3) and connector (4) in proper order outward, realize the high-speed joint and dismantle with fatigue testing machine through connector (2), through connector (2) and nested taper sleeve (3) and clamping piece (2) in proper order to twisted steel sample (1) transmission circulation loading power step by step and carry out fatigue test. The utility model can effectively avoid the damage to the clamping parts at the two ends of the twisted steel, ensure the smooth running of the fatigue test of the twisted steel and the accurate measurement of the fatigue failure times, provide reliable technical basis for the judgment of the fatigue performance state and the fatigue life of the twisted steel, and improve the success rate and the accuracy of the test; the utility model discloses still have the advantage of being convenient for equipment and dismantlement.

Description

Clamping device for testing fatigue performance of twisted steel
Technical Field
The utility model belongs to the technical field of fatigue test, concretely relates to clamping device of test twisted steel fatigue performance.
Background
The twisted steel is widely applied to engineering anchoring parts such as continuous beams of large bridges, dams of hydropower stations, nuclear power stations and the like, and due to the fact that the twisted steel bears repeated and periodic dynamic load effects for a long time, the twisted steel is prone to fatigue fracture, and therefore tensile fatigue performance testing of the twisted steel is necessary, practical use conditions can be simulated through the fatigue testing, relevant performance data are provided for designers, manufacturers and users of the twisted steel, and safe use and performance improvement of the twisted steel are facilitated. At present when carrying out fatigue test to the twisted steel, still adopt fatigue testing machine's the both ends of keeping silent direct centre gripping twisted steel to test mostly, the tangential force that the horizontal interlock of keeping silent produced like this causes the reinforcing bar damage very easily, damage position often can produce stress concentration again in the experimentation, cause the twisted steel to break in keeping silent, twisted steel fatigue test just can't go on smoothly, consequently, it is lower to utilize traditional centre gripping mode to test the experimental success rate of fatigue property of twisted steel, also can not the accurate fatigue failure number of times of survey twisted steel. Therefore, in view of the defects of the conventional clamping manner, a special clamping device and a special clamping method are needed to be designed to realize the connection between the twisted steel and the jaw of the fatigue testing machine, so that the damage and the fracture of the steel bar caused by the direct contact between the jaw of the fatigue testing machine and the twisted steel are effectively avoided, the smooth progress of the fatigue test of the twisted steel is ensured, the success rate of the test is improved, and the fatigue failure times and the fatigue performance of the twisted steel are accurately tested.
Disclosure of Invention
The utility model aims at providing a clamping device of test twisted steel fatigue performance just to the weak point that exists among the above-mentioned prior art. The utility model can effectively avoid the damage to the clamping parts at the two ends of the twisted steel, ensure the smooth running of the fatigue test of the twisted steel and the accurate measurement of the fatigue failure times, provide reliable technical basis for the judgment of the fatigue performance state and the fatigue life of the twisted steel, and improve the success rate and the accuracy of the test; furthermore, the utility model discloses still have the advantage of being convenient for equipment and dismantlement.
The purpose of the utility model can be realized by the following technical measures:
the utility model discloses a clamping device for testing the fatigue performance of a twisted steel, which comprises two sets of clamping pieces, a cone sleeve and a connector which are symmetrically clamped at two ends of a twisted steel sample and are sequentially nested from inside to outside (the utility model realizes rapid connection and disassembly through the connector and a fatigue testing machine, and gradually transmits cyclic loading force to the twisted steel sample through the connector and the cone sleeve and the clamping pieces which are sequentially nested to carry out fatigue testing), the outer surface of the twisted steel sample is combined with the inner cavity of the clamping piece in a matching mode of sawtooth meshing and thread meshing (the sawtooth meshing increases the friction force between the twisted steel sample and the clamping piece by increasing the roughness, the thread meshing increases the friction force between the twisted steel sample and the clamping piece by increasing the contact area), the outer surface of the clamping piece is combined with the inner cavity of the cone sleeve in a conical surface matching mode (the clamping pieces are gradually folded under the action of axial force to realize centering self-locking, the clamping piece is in gapless fit with the conical sleeve, so that the end of the self-locking type clamping twisted steel sample is clamped, the outer surface of the conical sleeve is combined with the bottom of the inner cavity of the connector in a cylindrical surface fit mode (radial positioning between the conical sleeve and the connector is realized, and smooth transmission of axial cyclic loading force is guaranteed); the clamping piece is a combined clamping piece structure which is surrounded by three same arc-shaped clamping pieces, the inner cavity of the combined clamping piece structure is a sawtooth-shaped threaded hole surface, and the outer contour of the combined clamping piece structure is a cone frustum (the clamping piece is ensured to be gradually folded under the action of axial force so as to realize centering self-locking); the taper sleeve is of a taper sleeve structure with a cylindrical outer contour and a conical table top in an inner cavity; the connector wholly is the ladder cylinder structure, the footpath section is outer even fatigue testing machine's exposed core (link to each other with fatigue testing machine's keeping silent, transmission circulation loading power), form about four chamber walls (as the installation passageway of taper sleeve business turn over connector) about following radial processing cuboid logical groove back in the big footpath section, it has circular location blind hole (realize the radial positioning between taper sleeve and the connector to process downwards from the upper surface center on the lower chamber wall (guarantee to transmit axial circulation loading power smoothly), set up on the chamber wall down and extend from one side opening end that cuboid logical groove was led to along in chamber wall center down, and run through the U-shaped groove of chamber wall thickness direction (as the installation passageway of twisted steel sample business turn over connector).
The utility model discloses in zigzag threaded hole face is processed into the alternate cockscomb structure inner chamber face of convex-concave earlier at cylinder inner chamber face top-down (the sawtooth interlock increases the frictional force between twisted steel sample and the clamping piece through increasing roughness), processes out thin screw thread (threaded engagement increases the frictional force between twisted steel sample and the clamping piece through increasing area of contact) again on the convex surface of cockscomb structure inner chamber face and the concave surface.
The utility model discloses every in the central angle of arc clamping piece all is less than 120 degrees (guarantee to have certain clearance of drawing in between the three arc clamping piece pieces in the clamping piece, can draw in into complete circular cone mesa and realize the centering auto-lock gradually under the effect of axial force).
The utility model discloses in the circular cone outer surface tapering of clamping piece is the same with the telescopic inner chamber circular cone mesa tapering of awl, and the tapering all is less than 30 degrees (guarantees smooth centering auto-lock).
The utility model discloses in the diameter of circular location blind hole and the telescopic cylinder surface diameter phase-match of awl (guarantee location smoothly), and all be less than the length and the width that the cuboid led to the groove (guarantee that the awl sleeve passes in and out the connector smoothly).
The utility model discloses in the surface processing screw thread of exposed core (be convenient for with the quick combination of keeping silent of outside fatigue testing machine, realize the utility model discloses with outside fatigue testing machine's quick connection).
The design principle of the utility model is as follows:
the utility model discloses a two sets of symmetry centre gripping are at the both ends of twisted steel sample, and by the clamping piece, the awl sleeve that constitute to outer nested clamping piece in proper order from interior. The utility model discloses a connector and fatigue testing machine realize high-speed joint and dismantlement to carry out fatigue test to the twisted steel sample transmission circulation loading power step by step through connector and nested awl sleeve and clamping piece in proper order. Because utilize the utility model discloses both can connect fatigue testing machine and can press from both sides tight end of twisted steel sample from locking-type again, just so can effectively avoid fatigue testing machine keep silent and twisted steel damage and the fracture that causes with twisted steel direct contact, effectively avoid producing the damage to the centre gripping position at twisted steel both ends promptly, guarantee the smooth going on of twisted steel fatigue test and to the accurate survey of fatigue failure number of times, provide reliable technical basis for twisted steel's fatigue performance state and fatigue life's judgement, improve experimental success rate and the degree of accuracy. More specifically, because the outer surface of the clamping end of the utility model is processed with threads, the clamping end can be quickly combined with the jaw of an external fatigue testing machine in a thread mode, so that the utility model can be quickly and effectively connected with the external fatigue testing machine, and the cyclic loading force of the fatigue testing machine is smoothly transmitted to the connector through the jaw and the clamping end; the conical sleeve is nested and positioned in the round positioning blind hole in the lower cavity wall of the connector, so that the axial cyclic loading force is ensured to be smoothly transmitted from the connector to the conical sleeve; the clamping pieces are gradually folded under the action of axial force to form an inner cavity of the sawtooth threaded hole surface in a surrounding mode, so that the clamping pieces have a centering and self-locking function, the gapless matching of the clamping pieces and the conical sleeve is gradually realized, and meanwhile, the end of the threaded steel bar sample is clamped in a self-locking mode through the inner cavity of the sawtooth threaded hole surface. Therefore, the cyclic loading force of the fatigue testing machine is transmitted to the twisted steel sample step by step through the connector, the conical sleeve and the clamping piece to carry out fatigue loading and testing, the clamping parts at two ends of the twisted steel are effectively prevented from being damaged, the smooth running of the twisted steel fatigue test and the accurate determination of the fatigue failure times are ensured, and the success rate and the accuracy of the test are improved. In addition, the cuboid through groove arranged in the utility model is used as an installation channel for the cone sleeve to pass in and out the connector, and the cone sleeve can directly and easily penetrate into the connector along the cuboid through groove and then can be smoothly positioned in the round positioning blind hole; a U-shaped groove formed in the lower cavity wall is used as an installation channel for the twisted steel sample to enter and exit the connector, and the twisted steel sample can directly and easily penetrate into the connector along the U-shaped groove; the outer surface of the clamping end is provided with a thread which is convenient to be rapidly combined with a jaw of an external fatigue testing machine, so that the utility model can be rapidly connected with the external fatigue testing machine; therefore, the utility model discloses still have the advantage of being convenient for assemble and dismantle.
The utility model has the advantages of as follows:
the utility model can effectively avoid the damage to the clamping parts at the two ends of the twisted steel, ensure the smooth running of the fatigue test of the twisted steel and the accurate measurement of the fatigue failure times, provide reliable technical basis for the judgment of the fatigue performance state and the fatigue life of the twisted steel, and improve the success rate and the accuracy of the test; furthermore, the utility model discloses still have the advantage of being convenient for equipment and dismantlement.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a front view of the structure of the connector.
Fig. 3 is a sectional view a-a in fig. 2.
Fig. 4 is a bottom view of fig. 2.
Fig. 5 is a front view of the clip structure.
Fig. 6 is a top view of fig. 5.
Fig. 7 is a sectional view B-B in fig. 6.
Fig. 8 is a partial enlarged view at C in fig. 7.
Fig. 9 is a structural front sectional view of the sleeve.
Fig. 10 is a top view of fig. 9.
Number in the figure: 1. the device comprises a twisted steel bar sample, 2 parts of clamping pieces, 2-1 parts of arc-shaped clamping pieces, 2-2 parts of sawtooth-shaped threaded hole surfaces, 2-2-1 parts of sawtooth-shaped inner cavity surfaces, 2-2-2 parts of fine threads, 3 parts of conical sleeves, 4 parts of connectors, 4-1 parts of clamping ends, 4-2 parts of cuboid through grooves, 4-3 parts of circular positioning blind holes, 4-4 parts of U-shaped grooves.
Detailed Description
The present invention is further described below with reference to the accompanying drawings and examples:
as shown in fig. 1-10, the clamping device for testing the fatigue property of the twisted steel of the present invention comprises two sets of clamping pieces 2, taper sleeves 3 and connectors 4 which are symmetrically clamped at two ends of a twisted steel sample 1 and are sequentially nested from inside to outside (the present invention realizes rapid connection and disassembly through the connector 2 and the fatigue testing machine, and gradually transmits a cyclic loading force to the twisted steel sample 1 through the connector 2 and the taper sleeves 3 and the clamping pieces 2 which are sequentially nested to perform fatigue testing), the outer surface of the twisted steel sample 1 is combined with the inner cavity of the clamping piece 2 in a matching manner of sawtooth engagement and thread engagement (the sawtooth engagement increases the friction force between the twisted steel sample 1 and the clamping piece 2 by increasing the roughness, the thread engagement increases the friction force between the twisted steel sample 1 and the clamping piece 2 by increasing the contact area), the outer surface of the clamping piece 2 is combined with the inner cavity of the taper sleeve 3 in a conical surface matching mode (the clamping piece 2 is gradually folded under the action of axial force to realize centering self-locking, realize the zero clearance matching of the clamping piece 2 and the taper sleeve 3 and further realize the self-locking clamping of the end of the threaded steel bar sample 1), and the outer surface of the taper sleeve 3 is combined with the bottom of the inner cavity of the connector 4 in a cylindrical surface matching mode (the radial positioning between the taper sleeve 3 and the connector 4 is realized, and the smooth transmission of axial cyclic loading force is ensured); the clamping piece 2 is a combined clamping piece structure which is surrounded by three same arc-shaped clamping pieces 2-1, the inner cavity of the combined clamping piece structure is a sawtooth thread hole surface 2-2, and the outer contour of the combined clamping piece structure is a cone frustum (the clamping piece 2 can be ensured to be gradually folded under the action of axial force so as to realize centering self-locking); the conical sleeve 3 is a conical sleeve structure with a cylindrical outer contour and a conical table top in an inner cavity; connector 4 wholly is the ladder cylinder structure, and the footpath section is the exposed core 4-1 of fatigue testing machine (link to each other with the keeping silent of fatigue testing machine, transmits the circulation loading power), forms four chamber walls about from top to bottom (as the installation passageway of awl sleeve 3 business turn over connector 4) along radial processing cuboid logical groove 4-2 back on the big footpath section, and it has circular location blind hole 4-3 to process downwards from the upper surface center of chamber wall down (realize the radial positioning between awl sleeve 3 and the connector 4, guarantee to transmit the axial circulation loading power smoothly), set up on the chamber wall down from chamber wall center along one side opening end extension of cuboid logical groove, and run through the U-shaped groove 4-4 of chamber wall thickness direction (as the installation passageway of threaded steel sample 1 business turn over connector 4).
The utility model discloses in zigzag threaded hole face 2-2 is processed into alternate cockscomb structure inner chamber face 2-2-1 (the friction between twisted steel sample 1 and clamping piece 2 is increased through increasing roughness to the sawtooth interlock) at cylinder inner chamber face top-down earlier, processes out fine screw thread 2-2-2 (the threaded engagement increases the friction between twisted steel sample 1 and clamping piece 2 through increasing area of contact) again on the convex surface and the concave surface of cockscomb structure inner chamber face.
In the utility model, the central angle of each arc-shaped clamping piece 2-1 is less than 120 degrees (ensuring that certain drawing gaps exist between the three arc-shaped clamping pieces 2-1 in the clamping piece 2, and the arc-shaped clamping pieces can be gradually drawn into a complete conical table surface under the action of axial force to realize centering self-locking).
The utility model discloses in the circular cone outer surface tapering of clamping piece 2 is the same with the inner chamber circular cone mesa tapering of taper sleeve 3, and the tapering all is less than 30 degrees (guarantees smooth centering auto-lock).
The utility model discloses in the diameter of circular location blind hole 4-3 and the cylinder surface diameter phase-match of awl sleeve 3 (guarantee location smoothly), and all be less than the length and the width that the logical groove 4-2 of cuboid (guarantee that awl sleeve 3 passes in and out connector 4 smoothly).
The utility model discloses in the surface processing screw thread of exposed core 4-1 (be convenient for combine fast with the jaw of outside fatigue testing machine, realize the utility model discloses with outside fatigue testing machine's quick connection).
Utilize the utility model discloses test twisted steel fatigue performance's step as follows:
A. selecting two sets of matched clamping pieces 2, conical sleeves 3 and connectors 4 according to the diameter of the deformed steel bar sample 1;
B. determining the length of the deformed steel bar sample 1 according to the stroke of the fatigue testing machine and the length of the clamping device, and determining the relative distance between the two connectors 4 according to the length of the deformed steel bar sample 1;
C. starting the fatigue testing machine, so that the upper jaw and the lower jaw of the fatigue testing machine respectively clamp the clamping ends 4-1 of the two connectors 4, and the two connectors 4 are arranged symmetrically up and down;
D. the two taper sleeves 3 are respectively sleeved at two ends of a deformed steel bar sample 1, two sets of clamping pieces 2 are respectively screwed at the two ends of the deformed steel bar sample 1, namely a sawtooth threaded hole surface 2-2 formed by encircling three same arc-shaped clamping pieces 2-1 and the deformed steel bar sample 1 preliminarily clamp the deformed steel bar sample 1 in a matching mode of sawtooth occlusion and threaded engagement, then the clamping pieces 2 are placed in an inner cavity of a cone table of the corresponding taper sleeve 3, and pretightening force is applied to preliminarily fix the deformed steel bar sample 1, the clamping pieces 2 and the taper sleeves 3 together;
E. d, respectively penetrating two sets of clamping pieces 2 and taper sleeves 3 which are preliminarily fixed in the step D from the cuboid through grooves 4-2 of the upper connector 4 and the lower connector 4, and simultaneously respectively penetrating two ends of the deformed steel bar sample 1 from the U-shaped grooves 4-4 of the two connectors 4;
F. the relative positions of the two connectors 4 are gradually increased by adjusting the distance between the upper jaw and the lower jaw of the fatigue testing machine, along with the up-and-down outward movement of the two connectors 4, the conical sleeve 3 firstly enters the circular positioning blind hole 4-3 of the connector 4 for positioning, and then the three arc-shaped clamping blocks 2-1 in each set of clamping pieces 2 are gradually folded and centered and self-locked by the conical surface matching between the conical sleeve 3 and the clamping pieces 2 until the clamping pieces 2 and the conical sleeve 3 realize gapless matching, so that the end of the threaded steel bar sample 1 is clamped;
G. and setting relevant test parameters of the fatigue testing machine, starting the fatigue testing machine to carry out fatigue test on the twisted steel sample 1, and observing and recording test data and results.

Claims (6)

1. The utility model provides a test twisted steel fatigue performance's clamping device which characterized in that: the clamping device is composed of two sets of clamping pieces (2), a taper sleeve (3) and a connector (4) which are symmetrically clamped at two ends of a deformed steel bar sample (1) and are sequentially nested from inside to outside, the outer surface of the deformed steel bar sample (1) is combined with the inner cavity of the clamping pieces (2) in a matching mode of sawtooth occlusion and thread engagement, the outer surface of the clamping pieces (2) is combined with the inner cavity of the taper sleeve (3) in a conical surface matching mode, and the outer surface of the taper sleeve (3) is combined with the bottom of the inner cavity of the connector (4) in a cylindrical surface matching mode; the clamping piece (2) is a combined clamping piece structure which is surrounded by three identical arc-shaped clamping piece blocks (2-1) to form a sawtooth-shaped threaded hole surface (2-2) in an inner cavity and a truncated cone-shaped outer contour; the conical sleeve (3) is of a conical sleeve structure with a cylindrical outer profile and a conical table top in an inner cavity; the connector (4) is integrally of a stepped cylindrical structure, the small-diameter section is a clamping end (4-1) of an externally-connected fatigue testing machine, the rectangular through groove (4-2) is radially processed on the large-diameter section to form four cavity walls from top to bottom, a circular positioning blind hole (4-3) is processed downwards from the center of the upper surface of the lower cavity wall, and a U-shaped groove (4-4) which extends from the center of the lower cavity wall along the opening end of one side of the rectangular through groove and penetrates through the wall thickness direction of the lower cavity is formed in the lower cavity wall.
2. The clamping device for testing the fatigue performance of the threaded steel bar according to claim 1, wherein: the sawtooth-shaped threaded hole surface (2-2) is formed by processing sawtooth-shaped inner cavity surfaces (2-2-1) with alternate convex and concave on the cylindrical inner cavity surface from top to bottom, and then processing fine threads (2-2-2) on the convex surface and the concave surface of the sawtooth-shaped inner cavity surface.
3. The clamping device for testing the fatigue performance of the threaded steel bar according to claim 1, wherein: the central angle of each arc-shaped clamping piece block (2-1) is less than 120 degrees.
4. The clamping device for testing the fatigue performance of the threaded steel bar according to claim 1, wherein: the taper of the outer surface of the cone frustum of the clamping piece (2) is the same as that of the inner cavity cone table top of the cone sleeve (3), and the taper is less than 30 degrees.
5. The clamping device for testing the fatigue performance of the threaded steel bar according to claim 1, wherein: the diameter of the round positioning blind hole (4-3) is matched with the diameter of the outer surface of the cylinder of the conical sleeve (3), and the diameter of the round positioning blind hole is smaller than the length and the width of the cuboid through groove (4-2).
6. The clamping device for testing the fatigue performance of the threaded steel bar according to claim 1, wherein: and machining threads on the outer surface of the clamping end (4-1).
CN202120127513.4U 2021-01-18 2021-01-18 Clamping device for testing fatigue performance of twisted steel Active CN214309878U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202120127513.4U CN214309878U (en) 2021-01-18 2021-01-18 Clamping device for testing fatigue performance of twisted steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202120127513.4U CN214309878U (en) 2021-01-18 2021-01-18 Clamping device for testing fatigue performance of twisted steel

Publications (1)

Publication Number Publication Date
CN214309878U true CN214309878U (en) 2021-09-28

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ID=77825465

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202120127513.4U Active CN214309878U (en) 2021-01-18 2021-01-18 Clamping device for testing fatigue performance of twisted steel

Country Status (1)

Country Link
CN (1) CN214309878U (en)

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