Hinge support device for axial pressure instability experiment test of inflatable simply supported beam

Abstract

The invention discloses a hinged support device for an axial pressure instability experiment test of an inflatable simply supported beam, which comprises a bottom support, the upper surface of the bottom support is fixedly connected with a first nut supporting structure, the upper surface of the first nut supporting structure is fixedly connected with a bearing support, and the upper surface of the bearing support is fixedly connected with a second nut supporting structure. The interior of the bearing support is movably connected with a sample tray through a bearing, and the side surface of the sample tray is fixedly connected with a sample tray baffle; an elastic rope is fixedly connected to the edge of the sample tray, the end, away from the sample tray, of the elastic rope is fixedly connected with the bottom support, and an inflatable simply supported beam is placed on the upper surface of the sample tray. The test sample tray is used for placing an inflatable column test sample and is connected with the bearing support through the bearing. The inflatable column sample can be controlled to rotate towards the preset rotation direction in the experiment process through the constraint effect exerted on the sample tray by the elastic rope.

Description

Technical Field

[0001] The invention relates to the technical field of inflatable simply supported beam axial experiments, and in particular to a hinge support device used for an inflatable simply supported beam axial compression instability experimental test. Background Art

[0002] Inflatable membrane structures are characterized by light weight, foldability, easy deployment and low manufacturing cost, and are widely used in civil engineering and aerospace fields. Among them, inflatable columns are a typical inflatable membrane structure, which are often used as a basic load-bearing component in various types of inflatable membrane structures. Inflatable simply supported beams are inflatable columns supported by hinged supports at both ends, which have important research value and significance in both theory and engineering applications.

[0003] At present, there are some shortcomings in the inflatable simply supported beam experiment, which are mainly reflected in two aspects: 1) The hinge support has low precision. It is mainly manifested in inflexible rotation or too large gap; 2) The repeatability of the experiment is low. The deformation of the inflatable simply supported beam under axial pressure is essentially a phenomenon of compressive instability of thin-walled structures, which is difficult to predict. Therefore, an initial disturbance is artificially applied during the experiment to achieve the experimental purpose. However, the method, size, time and position of applying the initial disturbance are difficult to ensure consistency in each experiment, which makes the repeatability of the experiment low. Therefore, it is very important to design a high-precision and controllable hinge support. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a hinge support device for axial compression instability test of an inflatable simply supported beam, wherein the inflatable column sample is placed through a sample tray, and is connected to the bearing support through a bearing. The inflatable column sample can be controlled to rotate in a preset rotation direction during the experiment through the constraint effect of the elastic rope applied to the sample tray.

[0005] The present invention also provides a hinge support device for the axial compression instability experimental test of an inflatable simply supported beam, comprising: a bottom support, the upper surface of the bottom support is fixedly connected to a first nut support structure, the upper surface of the first nut support structure is fixedly connected to a bearing support, the interior of the bearing support is movably connected to a sample tray via a bearing, the side surface of the sample tray is fixedly connected to a sample tray baffle; an elastic rope is fixedly connected to the edge of the sample tray, the end of the elastic rope away from the sample tray is fixedly connected to the bottom support, and an inflatable simply supported beam is placed on the upper surface of the sample tray.

[0006] According to a hinge support device for axial compression instability experimental testing of an inflatable simply supported beam provided by the present invention, a weight-reducing hole is arranged inside the bottom support.

[0007] According to a hinge support device for axial compression instability experimental testing of an inflatable simply supported beam provided by the present invention, the first nut support structure is fixedly connected to the bearing support by bolts, and an opening is provided at the top of the bearing support, and the opening is controlled by the bearing support bolts.

[0008] According to a hinge support device for axial compression instability experimental testing of an inflatable simply supported beam provided by the present invention, a first elastic rope interface and a second elastic rope interface are symmetrically installed circumferentially on the edge of the sample tray, and the connecting line and the rotation axis of the first elastic rope interface and the second elastic rope interface are perpendicular to each other.

[0009] According to a hinge support device for axial compression instability experimental testing of an inflatable simply supported beam provided by the present invention, bottom support baffles are fixedly connected to both sides of the lower surface of the bottom support, and a third elastic rope interface and a fourth elastic rope interface are provided on the surface of the bottom support.

[0010] According to a hinge support device for axial compression instability experimental testing of a pneumatic simply supported beam provided by the present invention, the elastic rope is located between the first elastic rope interface and the third elastic rope interface, and between the second elastic rope interface and the fourth elastic rope interface.

[0011] According to a hinge support device for axial compression instability test of an inflatable simply supported beam provided by the present invention, the outer surface of the sample tray baffle is fixedly connected to a second nut support structure, and a first nut is arranged inside the second nut support structure.

[0012] According to a hinge support device for axial compression instability experimental testing of a pneumatic simply supported beam provided by the present invention, the connecting line of the second nut support structure is the rotation axis of the hinge support.

[0013] According to a hinge support device for axial compression instability experimental testing of an inflatable simply supported beam provided by the present invention, a second nut is fastened and installed inside the first nut support structure, there are four first nut support structures in total, and the four first nut support structures are symmetrically fixed on the bottom support.

[0014] Beneficial Effects

[0015] 1. The present invention uses a sample tray for placing an inflatable column sample, and is connected to a bearing support through a bearing. The elastic rope exerts a restraining effect on the sample tray, so that the inflatable column sample can be controlled to rotate in a preset rotation direction during the experiment.

[0016] 2. The present invention has the characteristics of high precision and controllable rotation direction to improve the accuracy and repeatability of the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0018] Figure 1 The overall structure diagram of the hinge support device used for the axial compression instability test of the inflatable simply supported beam of the present invention;

[0019] Figure 2 It is a structural diagram of a sample tray of a hinge support device used for axial compression instability test of an inflatable simply supported beam according to the present invention;

[0020] Figure 3 This is a structural diagram of the bottom support of the hinge support device used for the axial compression instability test of the inflatable simply supported beam of the present invention;

[0021] Figure 4 This is a structural diagram of a bearing support of a hinge support device used for axial compression instability test of an inflatable simply supported beam according to the present invention;

[0022] Figure 5 It is a diagram of the balance state of the tension rope of the hinge support device used for the axial compression instability test of the inflatable simply supported beam of the present invention;

[0023] Figure 6 This is a diagram of the shortened state of the tension rope of the hinge support device used for the axial compression instability experimental test of the inflatable simply supported beam of the present invention.

[0024] Legend:

[0025] 1. First elastic rope interface; 2. Sample tray; 3. Bearing support; 4. Bolt; 5. Elastic rope; 6. Bottom support; 7. Bottom support baffle; 8. First nut supporting structure; 9. Second nut supporting structure; 10. First nut; 11. Second elastic rope interface; 12. Third elastic rope interface; 13. Fourth elastic rope interface; 14. Second nut; 15. Bearing; 16. Bearing support bolt. DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0027] Reference Figure 1 The embodiment of the present invention is a hinge support device for axial compression instability test of an inflatable simply supported beam, which includes: a sample tray 2 and two bearing supports 3 are fastened together by bolts 4 and nuts, and the sample tray 2 can rotate with the bearing 15. The bearing supports are tightly fixed to the bottom support 6 by bolts 4. The sample tray 2 and the bottom support 6 are connected by an elastic rope 5.

[0028] Reference Figure 2Two sample tray baffles and a first elastic rope interface 1 and a second elastic rope interface 11 are symmetrically installed along the circumference of the edge of the sample tray 2. A nut support structure 9 is provided on the outer surface of the thin-walled baffle, and a nut 10 is fastened inside the thin-walled baffle. The connecting line of the two nut support structures 9 is the rotation axis of the hinge support, and the connecting line rotation axes of the first elastic rope interface 1 and the second elastic rope interface 11 are perpendicular to each other.

[0029] refer to Figure 3 The bottom support 6 is processed with three holes to form weight-reducing holes, which can save materials while ensuring the structural integrity. Two bottom support baffles 7 are arranged at the two end positions in the length direction. A third elastic rope interface 12 and a fourth elastic rope interface 13 are arranged on the symmetric axis in the length direction. The nut 14 is fastened and installed inside the nut support structure 8, which has four substructures and is symmetrically fixed on the bottom support.

[0030] refer to Figure 4 , place the bearing 15 in the cylindrical guide rail of the bearing support 3, adjust the position so that the surface of the bearing 15 coincides with the surface of the bearing support 3, and tighten the bolt 15 so that the bearing 15 and the bearing support are in close contact to form a substructure to ensure that the two do not move relative to each other.

[0031] Reference Figure 5-6 When the sample is not installed, the elastic rope 5 maintains its original length, and the sample tray 2 is constrained by the elastic rope 5 and tilts. After the sample is installed, at the initial moment of the experiment, the sample tray 5 will resume its tilt and remain horizontal. At this time, the elastic rope 5 has the maximum elongation and thus the maximum elastic tension. The maximum elastic tension can be regarded as the initial disturbance of the sample. In order to reduce the impact of the initial disturbance on the experiment, the maximum tension should be controlled not to exceed 0.5N.

[0032] According to the principle of mechanics, the effect of the tension of the elastic rope 5 on the rotating shaft is equivalent to the bending moment of the rotation around the rotating shaft, and the equivalent bending moment can make the inflatable cantilever beam rotate smoothly around the shaft as the compression distance of the universal material testing machine changes. As the rotation increases, the spatial distance between the second elastic rope interface 11 and the third elastic rope interface 13 decreases, so that the elongation of the tensile elasticity decreases, the tension of the elastic rope 5 decreases, and thus the influence of the elastic rope 5 on the rotation is reduced.

[0033] During the entire rotation process, the angle between the elastic rope 5 and the bottom support 6 is always an obtuse angle. The tension of the elastic rope can be decomposed into a horizontal force component and a vertical force component in the horizontal and vertical directions. Since the angle is always an obtuse angle, the directions of the equivalent bending moments of the two force components are always consistent, which has a beneficial effect on the rotation.

[0034] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A hinge support device for axial compression instability test of an inflatable simply supported beam, characterized in that: include: A bottom support (6), the upper surface of the bottom support (6) being fixedly connected to a first nut support structure (8), the upper surface of the first nut support structure (8) being fixedly connected to a bearing support (3), the interior of the bearing support (3) being movably connected to a sample tray (2) via a bearing (15), and the side surface of the sample tray (2) being fixedly connected to a sample tray baffle; An elastic rope (5) is fixedly connected to the edge of the sample tray (2), one end of the elastic rope (5) away from the sample tray (2) is fixedly connected to a bottom support (6), and an inflatable simply supported beam is placed on the upper surface of the sample tray (2).

2. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: The bottom support (6) is provided with a weight-reducing hole inside.

3. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: The first nut support structure (8) is fixedly connected to the bearing support (3) via bolts (4); an opening is provided at the top of the bearing support (3); and the opening is controlled by the bearing support bolts (16).

4. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: The edge of the sample tray (2) is circumferentially provided with a first elastic rope interface (1) and a second elastic rope interface (11) which are symmetrically distributed, and the connecting line and the rotation axis of the first elastic rope interface (1) and the second elastic rope interface (11) are perpendicular to each other.

5. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: Bottom support baffles (7) are fixedly connected to both sides of the lower surface of the bottom support (6), and a third elastic rope interface (12) and a fourth elastic rope interface (13) are provided on the surface of the bottom support (6).

6. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: The elastic rope (5) is located between the first elastic rope interface (1) and the third elastic rope interface (12), and between the second elastic rope interface (11) and the fourth elastic rope interface (13).

7. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: A second nut supporting structure (9) is fixedly connected to the outer surface of the sample tray baffle, and a first nut (10) is arranged inside the second nut supporting structure (9).

8. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 7, characterized in that: The connecting line of the second nut supporting structure (9) is the rotation axis of the hinge support.

9. The hinge support device for axial compression instability test of an inflatable simply supported beam according to claim 1, characterized in that: A second nut (14) is fastened and installed inside the first nut support structure (8), there are four first nut support structures (8) in total, and the four first nut support structures (8) are symmetrically fixed on the bottom support (6).

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