CN213209719U - Fatigue test clamping device suitable for reinforcing bar mechanical joint - Google Patents

Fatigue test clamping device suitable for reinforcing bar mechanical joint Download PDF

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Publication number
CN213209719U
CN213209719U CN202022348451.8U CN202022348451U CN213209719U CN 213209719 U CN213209719 U CN 213209719U CN 202022348451 U CN202022348451 U CN 202022348451U CN 213209719 U CN213209719 U CN 213209719U
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CN
China
Prior art keywords
cavity
clamping
jaw
mechanical joint
steel bar
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CN202022348451.8U
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Chinese (zh)
Inventor
何岩
张钫
李鹏举
陈冬冬
严祖润
王百成
田华
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Sinosteel Zhengzhou metal products Research Institute Co.,Ltd.
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Sinosteel Zhengzhou Research Institute Of Steel Wire & Steel Products Co ltd
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Abstract

The utility model discloses a fatigue test clamping device suitable for reinforcing bar mechanical joint belongs to testing arrangement's technical field. The device consists of two sets of jaw seats, split jaw sheets and connectors which are sequentially nested and clamped at the end of a steel bar mechanical joint; the inner cavity surface of the jaw seat and the surrounding outer surface of the split jaw sheet are both matched conical surfaces; the outer contour of the connector is in a stepped cylindrical table shape, the upper end small-diameter section is a clamping end, four cavity walls are formed after rectangular through grooves are formed in the cylindrical surface of the large-diameter section along the radial direction, a circular positioning groove is machined in the upper surface of the lower cavity wall, and a U-shaped groove extending from the center of the bottom of the circular positioning groove along the length direction of the rectangular through grooves is machined in the lower cavity wall. The utility model can effectively avoid the damage to the clamping parts at the two ends of the mechanical joint of the steel bar, ensure the smooth and accurate measurement of the fatigue test 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

Fatigue test clamping device suitable for reinforcing bar mechanical joint
Technical Field
The utility model belongs to the technical field of testing arrangement, concretely relates to fatigue test clamping device suitable for reinforcing bar mechanical joint.
Background
The mechanical joint of the steel bars is formed by assembling and connecting two steel bars through a mechanical connecting device, and is widely applied to the fields of houses, bridges, highways and the like. Because the requirement on the tensile fatigue performance of the steel bar mechanical joint is higher in the process of bearing load for a long time, the steel bar mechanical joint must be subjected to a fatigue test, relevant performance data are further provided for designers, manufacturers, users and detection mechanisms, and safety accidents and quality accidents caused by fatigue damage of the steel bar mechanical joint in use are avoided. At present, when the fatigue test of the mechanical joint of the steel bar is carried out, the jaws of a fatigue testing machine are mostly adopted to directly clamp the two ends of the mechanical joint of the steel bar. This clamping method has the following disadvantages: 1. the jaw of the fatigue testing machine has strong engaging force and is easy to damage the end clamping part of the mechanical joint of the steel bar, so that the damage and the fracture of the clamping part are usually prior to fatigue failure, the fatigue test of the mechanical joint of the steel bar cannot be carried out smoothly, the success rate of the test is low, and the fatigue failure times of the mechanical joint of the steel bar cannot be measured accurately; 2. the fatigue failure state of the mechanical joint of the steel bar in the using process can not be effectively simulated, the fatigue performance of the steel bar material can not be truly reflected, and the error between the obtained test value and the true value is large, so that the measurement result is inaccurate; 3. when two reinforcing bars are assembled and connected to form a reinforcing bar mechanical joint, the influence of processing and installation factors is large, the centering performance of two ends of the reinforcing bar mechanical joint is difficult to guarantee, the jaws of a fatigue testing machine are directly used for clamping the two ends of the reinforcing bar mechanical joint, the two ends of the reinforcing bar mechanical joint are easily subjected to shear stress given by the jaws, and accurate test data cannot be obtained.
Disclosure of Invention
The utility model aims at providing a fatigue test clamping device suitable for reinforcing bar mechanical joint 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 mechanical joint of the steel bar, ensure the smooth and accurate measurement of the fatigue test of the mechanical joint of the steel bar, 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.
The purpose of the utility model can be realized by the following technical measures:
the utility model discloses a fatigue test clamping device suitable for a steel bar mechanical joint, which consists of two sets of jaw seats, split jaw pieces and connectors, wherein the jaw seats, the split jaw pieces and the connectors are respectively nested and clamped at two ends of the steel bar mechanical joint from inside to outside in sequence; the inner cavity surface of the jaw seat and the surrounding outer surface of the split jaw piece are conical surfaces which are matched with each other (the jaw seat and the split jaw piece are combined in a conical surface matching mode, self-locking is easy to realize, gapless matching is realized, centering is accurate, assembling and disassembling are convenient, and larger torque is transmitted), the outer surface of the jaw seat is a cylindrical surface, and the surrounding inner cavity surface of the split jaw piece is a columnar surface processed with sawtooth-shaped threads (the clamping part of the end of the steel bar mechanical joint can be firmly and effectively clamped, and the clamping part of the end of the steel bar mechanical joint can be prevented from being damaged); the outline of connector is ladder cylinder platform form, and wherein the minor diameter section of upper end is that the surface processes the screwed exposed core (realize effectively being connected of connector and outside fatigue testing machine fast), form about four chamber walls about following the rectangle leads to the groove from the cylindrical surface of major diameter section along radially seting up the rectangle about forming (seting up the rectangle and lead to the installation or the dismantlement of the seat of being convenient for jaw), the last surface machining of chamber wall has circular positioning groove (can realize quick location to the seat of jaw of inlay card in circular positioning groove) down, the processing has the U-shaped groove (the installation or the dismantlement of the reinforcing bar mechanical joint of being convenient for) that the groove bottom center extends along the rectangle leads to groove length direction from circular positioning groove on the chamber wall down, and the U-shaped groove runs through the thickness.
The utility model discloses in circular positioning groove's diameter is less than the width that the rectangle led to the groove (could ensure just so that the light business turn over rectangle of the seat of keeping silent leads to the groove, realizes the quick installation or the dismantlement of keeping silent the seat), and circular positioning groove's diameter and the external diameter phase-match of keeping silent the seat (realize the quick location of keeping silent the seat).
The utility model discloses in split type piece of keeping silent surrounds by three clamping pieces and forms, and the central angle of every clamping piece is less than 60 degrees (split type piece of keeping silent surrounds by three clamping pieces and forms, and reserves and has certain tight shrink gap of clamp, the auto-lock location and the loading and unloading of being convenient for).
The utility model discloses in the screw thread of exposed core and the screw thread phase-match of outside fatigue testing machine base (realize the high-speed joint of connector and outside fatigue testing machine smoothly).
The design principle of the utility model is as follows:
the utility model discloses a centre gripping subassembly centre gripping that two sets of nested vice mouthful seats and the piece of keeping silent constitute is at reinforcing bar mechanical joint's both ends to realize through the connector that vice mouthful seat is connected with outside fatigue testing machine's quick effective, guarantee going on smoothly and the accurate survey of reinforcing bar mechanical joint fatigue test, improve experimental success rate and the degree of accuracy. More specifically, the clamping end of the connector is combined with the base of the external fatigue testing machine in a threaded manner, so that the utility model can be quickly and effectively connected with the external fatigue testing machine, and the tensile force loaded by the fatigue testing machine can be smoothly and sequentially transmitted to the connector through the base to drive the connector to move outwards; the bottom end of the jaw seat is clamped and positioned in the circular positioning groove of the lower cavity wall of the connector, so that the jaw seat can be driven to move outwards when the connector moves outwards, the inner cavity of the jaw seat is combined with the outer surface of the split jaw piece in a conical surface matching mode, and the conical frustum hole and the conical outer contour of the split jaw piece with the same taper are gradually folded and self-locked when the jaw seat moves outwards, so that the gapless matching of the jaw seat and the split jaw piece is realized, the centering is accurate, the assembly and disassembly are convenient, and larger torque is transmitted; in addition, the inner cavity of the split jaw piece is provided with the sawtooth thread which can be meshed with the end clamping part of the mechanical joint of the steel bar, so that the end clamping part of the mechanical joint of the steel bar can be clamped tightly and effectively, and the end clamping part of the mechanical joint of the steel bar can be prevented from being damaged; in addition, the jaw piece is formed by encircling three clamping pieces, and a certain clamping contraction gap is reserved, so that the jaw piece is convenient for self-locking positioning and assembling and disassembling; simultaneously, the cylinder surface at the big footpath section of connector is along radially offering the rectangle that is convenient for jaw seat installation or dismantlement to lead to the groove, and processing has the U-shaped groove of being convenient for reinforcing bar mechanical joint installation or dismantlement under the connector on the chamber wall, also can realize the utility model discloses a fast assembly and dismantlement.
The utility model has the advantages of as follows:
the utility model discloses can effectively avoid producing the damage to the centre gripping position at reinforcing bar mechanical joint both ends, guarantee going on smoothly of reinforcing bar mechanical joint fatigue test with accurate survey, improve experimental success rate and the degree of accuracy, and then obtain comparatively accurate fatigue performance parameter, for reinforcing bar mechanical joint's fatigue performance state and fatigue life's judgement provides reliable technical basis, solved reinforcing bar mechanical joint fatigue test measured value and true value error great, the unsafe technical problem of testing result. 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 connector.
Fig. 3 is a sectional view a-a of fig. 2.
Fig. 4 is a bottom view of fig. 2.
FIG. 5 is a front view of the jaw piece.
Fig. 6 is a top view of fig. 5.
Fig. 7 is a sectional view B-B in fig. 6.
The sequence numbers in the figures illustrate: 1. the steel bar mechanical connector comprises a steel bar mechanical connector body 2, a connector body 2-1, a clamping end 2-2, a rectangular through groove 2-3, a lower cavity wall 2-4, a circular positioning groove 2-5, a U-shaped groove 3, a jaw seat 4, a split jaw piece 4-1 and a clamping piece.
Detailed Description
The utility model is further described with the following figures:
as shown in fig. 1 to 7, the fatigue test clamping device for a steel bar mechanical joint of the present invention is composed of two sets of jaw seats 3, split jaw pieces 4 and connectors 2, which are respectively nested and clamped at two ends of the steel bar mechanical joint 1 from inside to outside in sequence; the inner cavity surface of the jaw seat 3 and the surrounding outer surface of the split jaw piece 4 are conical surfaces which are matched with each other (the jaw seat 3 and the split jaw piece 4 are combined in a conical surface matching mode, self-locking is easy to realize, no-clearance matching is realized, centering is accurate, assembling and disassembling are convenient, and larger torque is transmitted), the outer surface of the jaw seat 3 is a cylindrical surface, and the surrounding inner cavity surface of the split jaw piece 4 is a columnar surface processed with zigzag threads (the clamping position of the end of the steel bar mechanical joint can be firmly and effectively clamped, and the damage to the clamping position of the end of the steel bar mechanical joint can be avoided); the outer contour of the connector 2 is in a stepped cylindrical table shape, wherein the upper end minor diameter section is a clamping end 2-1 (which can quickly realize the effective connection of the connector 2 and an external fatigue testing machine) the outer surface of which is provided with threads, the cylindrical surface of the major diameter section is provided with a rectangular through groove 2-2 along the radial direction to form four cavity walls (provided with the rectangular through groove 2-2 to facilitate the installation or the disassembly of a jaw seat 3), the upper surface of the lower cavity wall 2-3 is provided with a circular positioning groove 2-4 (which can quickly position the jaw seat 3 clamped in the circular positioning groove 2-4), the lower cavity wall 2-3 is provided with a U-shaped groove 2-5 (which is convenient for the installation or the disassembly of a mechanical steel bar joint 1) extending from the center of the bottom of the circular positioning groove 2-4 along the length direction of the rectangular through groove 2-, and the U-shaped groove 2-5 penetrates through the thickness direction of the lower cavity wall.
In the utility model, the diameter of the circular positioning groove 2-4 is smaller than the width of the rectangular through groove 2-2 (so as to ensure the easy access of the jaw seat 3 to the rectangular through groove 2-2 and realize the quick installation or disassembly of the jaw seat 3), and the diameter of the circular positioning groove 2-4 is matched with the outer diameter of the jaw seat 3 (to realize the quick positioning of the jaw seat 3).
The utility model discloses in split type piece of keeping silent 4 is enclosed by three clamping pieces 4-1 and forms, and every clamping piece 4-1's central angle is less than 60 degrees (split type piece of keeping silent 4 is enclosed by three clamping pieces 4-1 and forms, and reserve and have certain tight shrink gap of clamp, the auto-lock location of being convenient for and loading and unloading).
The utility model discloses in the screw thread of exposed core 2-1 and the screw thread phase-match of outside fatigue testing machine base (realize the high-speed joint of connector 2 and outside fatigue testing machine smoothly).
The utility model discloses a concrete use as follows:
first, the connector 2 is connected and fixed to an external fatigue testing machine. Then, adjusting the relative distance between the two connectors 2 according to the length of the mechanical joint 1 of the steel bar; then, the two jaw seats 3 are respectively penetrated and installed on the appropriate clamping positions at the two ends of the steel bar mechanical joint 1, and the small-bore ends of the two jaw seats 3 are opposite; then, putting the corresponding clamping piece 4-1 in the split type jaw piece 4 from the large aperture end of the jaw seat 3, contacting the zigzag threads surrounding the inner cavity surface by the split type jaw piece 4 with the mechanical joint 1 of the steel bar, contacting the conical outer surface of the split type jaw piece 4 with the conical inner hole of the jaw seat 3, and preliminarily clamping the mechanical joint 1 of the steel bar; then, the split jaw piece 4 and the jaw seat 3 which are combined into a whole at the two ends of the steel bar mechanical joint 1 are respectively put into the two connectors 2 through the rectangular through grooves 2-2; next, the positions of the two connectors 2 are adjusted through a fatigue testing machine, so that the end face of the jaw seat 3 is in close contact with the connectors 2, namely, the end of the jaw seat 3 enters the circular positioning groove 2-4 to be quickly positioned, the connector 2 moves outwards and simultaneously drives the jaw seat 3 to move outwards, the split jaw pieces 4 are gradually folded, centered and self-locked through the matching action of the conical surfaces, the gapless matching is realized, and the end of the steel bar mechanical connector 1 is clamped; and finally, setting parameters such as a stress mean value, a stress amplitude, a frequency and the like of the fatigue test, starting an external fatigue testing machine to perform the fatigue test on the steel bar mechanical joint 1, and recording test data.

Claims (4)

1. The utility model provides a fatigue test clamping device suitable for reinforcing bar mechanical joint which characterized in that: the clamping device consists of two sets of jaw seats (3), split jaw pieces (4) and connectors (2), which are respectively nested and clamped at two ends of the steel bar mechanical joint (1) from inside to outside in sequence; the inner cavity surface of the jaw seat (3) and the surrounding outer surface of the split jaw sheet (4) are conical surfaces which are matched with each other, the outer surface of the jaw seat (3) is a cylindrical surface, and the surrounding inner cavity surface of the split jaw sheet (4) is a cylindrical surface processed with sawtooth-shaped threads; the outer contour of the connector (2) is in a stepped cylindrical table shape, wherein the outer surface of the upper small-diameter section is provided with a threaded clamping end (2-1), a rectangular through groove (2-2) is formed in the radial direction of the cylindrical surface of the large-diameter section to form an upper cavity wall, a lower cavity wall, a left cavity wall and a right cavity wall, a circular positioning groove (2-4) is machined in the upper surface of the lower cavity wall (2-3), a U-shaped groove (2-5) extending from the center of the bottom of the circular positioning groove (2-4) along the length direction of the rectangular through groove (2-2) is machined in the lower cavity wall (2-3), and the U-shaped groove (2-5) penetrates through the thickness direction of the lower cavity.
2. The fatigue test clamping device suitable for the steel bar mechanical joint as claimed in claim 1, wherein: the diameter of the circular positioning groove (2-4) is smaller than the width of the rectangular through groove (2-2), and the diameter of the circular positioning groove (2-4) is matched with the outer diameter of the jaw seat (3).
3. The fatigue test clamping device suitable for the steel bar mechanical joint as claimed in claim 1, wherein: the split type jaw piece (4) is formed by encircling three clamping pieces (4-1), and the central angle of each clamping piece (4-1) is smaller than 60 degrees.
4. The fatigue test clamping device suitable for the steel bar mechanical joint as claimed in claim 1, wherein: the thread of the clamping end (2-1) is matched with the thread of the external fatigue testing machine base.
CN202022348451.8U 2020-10-21 2020-10-21 Fatigue test clamping device suitable for reinforcing bar mechanical joint Active CN213209719U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202022348451.8U CN213209719U (en) 2020-10-21 2020-10-21 Fatigue test clamping device suitable for reinforcing bar mechanical joint

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202022348451.8U CN213209719U (en) 2020-10-21 2020-10-21 Fatigue test clamping device suitable for reinforcing bar mechanical joint

Publications (1)

Publication Number Publication Date
CN213209719U true CN213209719U (en) 2021-05-14

Family

ID=75827661

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202022348451.8U Active CN213209719U (en) 2020-10-21 2020-10-21 Fatigue test clamping device suitable for reinforcing bar mechanical joint

Country Status (1)

Country Link
CN (1) CN213209719U (en)

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Address after: No.26, Huahua Road, high tech Development Zone, Zhengzhou, Henan Province, 450001

Patentee after: Sinosteel Zhengzhou metal products Research Institute Co.,Ltd.

Address before: No.26, Huahua Road, high tech Development Zone, Zhengzhou, Henan Province, 450001

Patentee before: SINOSTEEL ZHENGZHOU RESEARCH INSTITUTE OF STEEL WIRE & STEEL PRODUCTS Co.,Ltd.

CP01 Change in the name or title of a patent holder