End restraint structure of active bending component

Abstract

The end restraint structure of the active bending component comprises a base, lug plates, rolling shafts, plug pins and a limiting rod, the lug plates are symmetrically arranged on the base, the rolling shafts are arranged in the lug plates in a sliding mode, the two ends of the limiting rod are connected with the rolling shafts respectively, and the plug pins are inserted into the limiting rod. The limiting rod is provided with a matching groove matched with the active bending component, and the lug plate and the limiting rod are provided with limiting holes used for being matched with the plug pin respectively. The active bending component rotates in the lug plate through the limiting rod and the rolling shaft, the hinge constraint condition of the active bending component can be achieved, the rotation of the active bending component can be effectively restrained by inserting the plug pin into the lug plate and the limiting rod, and the fixed connection constraint condition of the active bending component is achieved, so that various end constraint forms of a mechanical property test are met. And the test efficiency and reliability are effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering, and in particular to an end restraint structure of an active bending member. Background Art

[0002] In order to understand the bending strain and stress distribution generated by components and materials under bending loads, as well as the deformation and fracture state under bending, mechanical performance tests of active bending components are usually carried out, such as form-finding analysis and post-buckling analysis. In mechanical performance tests, the structure of the two end bases needs to be determined according to the cross-sectional form or end constraint form of the component.

[0003] Chinese patent publication number CN 217059750 discloses a bending test device comprising a base, a rotating sleeve, a bracket, and a movable sleeve. The cut rebar to be tested is passed through the two rotating sleeves and the movable sleeve. The ends of the rebar are secured with fixtures. A drive mechanism operates, driving the movable sleeve downward, thereby bending the rebar downward. During the bending process, the rotating sleeve rotates relative to the lugs via a rotating shaft to match the rebar's bend angle. Once the forward bend is complete, the drive mechanism drives the movable sleeve upward, pulling the rebar upward and completing the reverse bend test.

[0004] However, the end restraint structure of existing mechanical properties tests can usually only achieve one form of restraint. If the end restraint form of the active bending member under study changes, it is generally necessary to remake the base and then conduct the test, which has low reliability and leads to low test efficiency.

[0005] Therefore, how to make the end structure of the active bending member meet various end constraint forms of mechanical performance tests and effectively improve the test efficiency and reliability has become an urgent problem to be solved in this field. Summary of the Invention

[0006] In view of the difference from the existing technology, the purpose of the present invention is to provide an end structure of an active bending member to meet various end constraint forms of mechanical performance tests and effectively improve test efficiency and reliability.

[0007] In order to achieve the above-mentioned purpose, the end structure of the active bending member provided by the present invention is used to cooperate with the active bending member, including a base, an ear plate, a roller, a pin and a limit rod, the ear plate is symmetrically arranged on the base, the roller is slidably arranged in the ear plate, the two ends of the limit rod are respectively connected to the roller, the limit rod is provided with a matching groove adapted to the active bending member, and the ear plate and the limit rod are respectively provided with limiting holes for cooperating with the pin.

[0008] Furthermore, it also includes a horizontal track, on which are distributed a plurality of positioning grooves for cooperating with the base.

[0009] Furthermore, an ear plate slide groove cooperating with the roller is provided in the ear plate, the roller is slidingly arranged in the outer end area of ​​the ear plate slide groove, and the inner end area of ​​the ear plate slide groove is provided with a first limiting hole.

[0010] Furthermore, the first limiting holes are symmetrically arranged at both ends of the ear plate sliding groove and pass through the ear plate.

[0011] Furthermore, a roller slot cooperating with the limiting rod is provided in the roller, the limiting rod is arranged in the roller slot, and a second limiting hole corresponding to the first limiting hole is provided in the end area of ​​the limiting rod.

[0012] Furthermore, the second limiting hole passes through the limiting rod.

[0013] Furthermore, a plurality of second limiting holes are distributed in an annular manner on the circumference of the limiting rod.

[0014] The end constraint structure of the active bending member provided by the present invention is that the active bending member rotates in the ear plate through the limit rod and the roller, which can realize the hinge constraint condition of the active bending member. Inserting the pin in the ear plate and the limit rod can effectively constrain the rotation of the active bending member and realize the fixed constraint condition of the active bending member, so as to meet various end constraint forms of mechanical performance tests and effectively improve the test efficiency and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 A schematic diagram of the exploded structure of the end restraint structure of the active bending member provided by the present invention;

[0017] Figure 2 A schematic diagram of the hinged constraint form of the end constraint structure of the active bending member provided by the present invention;

[0018] Figure 3 This is a schematic diagram of the overall structure of the end restraint structure of the active bending member provided by the present invention;

[0019] Figure 4 This is a schematic diagram of the cooperation between the middle ear plate and the limiting rod of the present invention when they are constrained by consolidation;

[0020] Figure 5 A schematic diagram of the fixed constraint form of the end constraint structure of the active bending member provided by the present invention;

[0021] Figure 6 This is a schematic diagram of the cooperation between the middle ear plate and the limiting rod of the present invention when the rotation angle is limited;

[0022] Figure 7 This is a schematic diagram of the corner limiting constraint form of the end constraint structure of the active bending member provided by the present invention.

[0023] Reference numerals:

[0024] 1. Base; 2. Ear plate; 21. Ear plate slide; 22. First limiting hole; 3. Roller; 31. Spherical part; 32. Roller slide; 4. Latch; 5. Limit rod; 51. Matching groove; 52. Second limiting hole; 6. Bolt; 7. Horizontal track; 71. Positioning groove; 8. Active bending member. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0026] See also Figure 1 , which shows an example of the end restraint structure of the active bending member provided by the present invention.

[0027] As can be seen from the figure, the end constraint structure of the active bending member of this example mainly includes a base 1, an ear plate 2, a roller 3, a pin 4 and a limit rod 5. The ear plate 2 is symmetrically arranged on the base 1, and the roller 3 is slidably arranged in the ear plate 2. The two ends of the limit rod 5 are respectively connected to the roller 3. The limit rod 5 is provided with a matching groove 51 adapted to the active bending member 8, and the ear plate 2 and the limit rod 5 are respectively provided with a limiting hole for cooperating with the pin 4. In this way, the active bending member 8 can rotate in the ear plate 2 through the limiting rod 5 to realize a hinged constraint form. After the pin 4 is inserted into the limiting hole, the active bending member 8 cannot rotate, realizing a fixed constraint form, thereby meeting various end constraint forms of mechanical performance tests and effectively improving the test efficiency and reliability.

[0028] Combine Figure 1 and Figure 2 Specifically, the two ear plates 2 are symmetrically arranged on the base 1, reserving space for the connection between the limit rod 5 and the active bending member 8, and the ear plate 2 is provided with an ear plate slide groove 21 for cooperating with the roller 3, so that the roller 3 can be slidably set in the ear plate slide groove 21.

[0029] Furthermore, a plurality of spherical parts 31 are distributed on the surface of the roller 3 so that the roller 3 can smoothly rotate in the ear plate slot 21 through the spherical parts 31 , so that the roller 3 can drive the limiting rod 5 and the active bending member 8 to rotate around the ear plate 2 .

[0030] In order to cooperate with the limit rod 5, the roller 3 is provided with a roller slot 32 for cooperating with the limit rod 5, so that the two ends of the limit rod 5 can be respectively set in the roller slot 32, and the roller 3 rotates in the ear plate slot 21 to drive the limit rod 5 to rotate synchronously.

[0031] Furthermore, a matching groove 51 adapted to the active bending member 8 is provided on the side wall of the limiting rod 5, so that the end of the active bending member 8 can be placed in the matching groove 51, and the limiting rod 5 can drive the active bending member 8 to rotate synchronously to realize a hinged constraint form.

[0032] Combine Figure 3 In order to ensure the stable connection between the active bending member 8 and the limit rod 5, the constraint structure also includes a horizontal rail 7, which is provided with a plurality of positioning grooves 71 for cooperating with the base 1, so that the two groups of bases 1 can be distributed on the horizontal rail 7, and the bolts 6 are passed through the base 1 and the positioning grooves 71 to fix the two groups of bases 1 on the horizontal rail 7.

[0033] Furthermore, the several positioning grooves 71 distributed on the horizontal track 7 can ensure that the distribution spacing of the two groups of bases 1 can be freely adjusted on the horizontal track 1, and the distribution spacing of the two groups of bases 1 can be adjusted to match the length of the active bending member 8 or the spacing required for the mechanical performance test, so as to ensure that the two ends of the active bending member 8 can respectively cooperate with the matching grooves 51 of the upper limit rods 5 on the two groups of bases 1.

[0034] At this time, the matching grooves 51 of the upper limit rods 5 on the two groups of bases 1 respectively apply clamping force to the two ends of the active bending member 8, stably placing the active bending member 8 in the matching grooves 51, which is convenient for subsequent mechanical performance tests.

[0035] Combine Figure 2 In this way, the active bending member 8 is distributed as a whole on the horizontal track 7, and the two ends are hingedly constrained by the base 1, ear plate 2, roller 3 and limit rod 5, which can perform three-point bending test or four-point bending test.

[0036] Combine Figure 1 and Figure 4 In order to meet various end constraint forms of mechanical performance tests and improve test efficiency and reliability, the width of the roller 3 is configured to be smaller than the width of the ear plate slide 21, and is arranged in the outer end area of ​​the ear plate slide 21. A first limiting hole 22 is provided in the inner end area of ​​the ear plate slide 21, and the first limiting hole 22 is symmetrically arranged at both ends of the slide and passes through the ear plate 2.

[0037] In coordination with it, the limiting rod 5 is arranged in the roller slot 32, part of the end area of ​​the limiting rod 5 is covered by the roller slot 32, and part of the end area is coordinated with the outer end area of ​​the ear plate slot 21. A second limiting hole 52 corresponding to the first limiting hole 22 is provided in the area where the limiting rod 5 cooperates with the outer end area of ​​the ear plate slot 21, and the second limiting hole 52 passes through the limiting rod 5.

[0038] Combine Figure 4 and Figure 5Therefore, the first limiting hole 22 on the limiting rod 5 is distributed correspondingly to the second limiting hole 52 on the ear plate 2, and the first limiting hole 22 and the second limiting hole 52 are adapted to the latch 4, so that the latch 4 can be inserted into the first limiting hole 22 and the second limiting hole 52 respectively, fixing the limiting rod 5 to the ear plate 2 and limiting the rotation of the limiting rod 5, so that the active bending member 8 cannot rotate, realizing a fixed constraint form.

[0039] Combine Figure 3 and Figure 5 In this way, the active bending member 8 is distributed as a whole on the horizontal track 7, and the limit rod 5 and the ear plate 2 are fixed with pins 4 at both ends. The base 1, ear plate 2, roller 3, limit rod 5 and pin 4 can form fixed constraints at both ends, and pure bending test or fatigue bending test can be carried out.

[0040] Correspondingly, if the pin 4 is not used at one end of the active bending member 8, a hinged constraint is formed by the base 1, ear plate 2, roller 3 and limit rod 5, and the other end is fixed with the pin 4 to fix the limit rod 5 and the ear plate 2, and a fixed constraint is formed by the base 1, ear plate 2, roller 3, limit rod 5 and pin 4, so that one end of the active bending member 8 is hingedly constrained and the other end is fixedly constrained, so that asymmetric bending tests or local destruction tests of continuous beams can be carried out.

[0041] Combine Figure 6 In some embodiments, a plurality of second limiting holes 52 are provided on the limiting rod 5, and the plurality of second limiting holes 52 are distributed in a ring shape along the circumference of the limiting rod 5, so that when the limiting rod 5 rotates arbitrarily in the ear plate 2, one of the second limiting holes 52 can be distributed corresponding to the first limiting hole 22, and at the same time, the matching groove 51 and each second limiting hole 52 are distributed at different angles.

[0042] Combine Figure 7 Therefore, the active bending member 8 is placed in the matching groove 51. When the limiting rod 5 is rotated at different angles in the ear plate 2, one of the first limiting holes 22 on the limiting rod 5 is distributed correspondingly to the first limiting hole 22. By inserting the pin 4 into the correspondingly distributed second limiting hole 52 and the first limiting hole 22, the rotation angle of the active bending member 8 can be fixed.

[0043] In this way, the two ends of the active bending member 8 are limited in rotation angle by the base 1, ear plate 2, roller 3, limit rod 5 and pin 4, simulating different rotational stiffnesses, and can conduct a test on the influence of rotational constraint stiffness on bending performance.

[0044] Therefore, the end constraint structure of the active bending member provided by the present invention can realize the two-end hinged constraint form, the two-end fixed constraint form, the one-end hinged and one-end fixed constraint form and the rotation angle limit constraint form of the active bending member 8 through the cooperation of the base 1, the ear plate 2, the roller 3, the pin 4, the limit rod 5 and the active bending member 8, and can meet various end constraint forms of mechanical performance tests and effectively improve the test efficiency and reliability.

[0045] In the specific application process, the end restraint structure does not need to be repeatedly removed and installed with the active bending member 8. Through one installation, it can form multiple end restraint forms through the use of the pin 4, thereby improving the test efficiency.

[0046] At the same time, the components of the end restraint structure do not require welding or gluing when mating with the active bending member 8, so they can be recycled many times, which to a certain extent alleviates or solves the problem of remaking the base according to different restraint conditions.

[0047] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An end restraint structure of an active bending member, used to cooperate with the active bending member, characterized in that: It includes a base, an ear plate, a roller, a pin and a limit rod, the ear plate is symmetrically arranged on the base, the roller is slidably arranged in the ear plate, the two ends of the limit rod are respectively connected to the roller, the limit rod is provided with a matching groove adapted to the active bending member, and the ear plate and the limit rod are respectively provided with a limiting hole for cooperating with the pin.

2. The end restraint structure of the active bending member according to claim 1, characterized in that: It also includes a horizontal track, on which are distributed a plurality of positioning grooves for cooperating with the base.

3. The end restraint structure of the active bending member according to claim 1, characterized in that: An ear plate slide groove cooperating with the roller is provided in the ear plate, the roller is slidingly arranged in the outer end area of ​​the ear plate slide groove, and a first limiting hole is provided in the inner end area of ​​the ear plate slide groove.

4. The end restraint structure of the active bending member according to claim 3, characterized in that: The first limiting holes are symmetrically arranged at both ends of the ear plate sliding groove and pass through the ear plate.

5. The end restraint structure of the active bending member according to claim 4, characterized in that: The roller is provided with a roller sliding groove matched with the limiting rod, the limiting rod is arranged in the roller sliding groove, and a second limiting hole corresponding to the first limiting hole is provided in the end area of ​​the limiting rod.

6. The end restraint structure of the active bending member according to claim 5, characterized in that: The second limiting hole passes through the limiting rod.

7. The end restraint structure of the active bending member according to claim 5, characterized in that: A plurality of second limiting holes are distributed in an annular manner on the circumference of the limiting rod.

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