CN220447823U

CN220447823U - Arched thin-wall anti-collision beam

Info

Publication number: CN220447823U
Application number: CN202320804567.9U
Authority: CN
Inventors: 张�雄; 傅欣荣
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2023-04-12
Filing date: 2023-04-12
Publication date: 2024-02-06
Anticipated expiration: 2033-04-12

Abstract

The utility model discloses an arch thin-wall anti-collision beam and a preparation device thereof, and belongs to the technical field of safety protection. The anti-collision beam is a thin-wall pipe fitting and is integrally arched and comprises a linear part and an arched part; the straight line parts are symmetrically arranged along the tangential directions of the two ends of the arch part; the middle part of the concave surface of the arched part is provided with a buckling deformation part. The utility model provides an arch thin-wall anti-collision beam and a preparation device thereof. During the three-point bending process, the arch area of the anti-collision beam may be locally buckled and sunken or wrinkled and deformed, but the anti-collision beam still has excellent anti-collision performance, and the energy absorption efficiency is even better than that of the anti-collision beam with a perfect middle arch section. Under the three-point bending load, compared with the straight beam with the same material, section and span, the energy absorption efficiency of the anti-collision beam is about 2-3 times higher.

Description

Arched thin-wall anti-collision beam

Technical Field

The utility model belongs to the technical field related to safety protection, and particularly relates to an arched thin-wall anti-collision beam.

Background

In modern transportation and industrial production activities, unexpected collision accidents frequently occur. In order to ensure the life and property safety of people in the collision accident, it is necessary to provide corresponding energy absorbing members to absorb the impact kinetic energy in the accident. The metal thin-wall energy-absorbing member has the advantages of low price, mature processing technology, stable deformation mode, high energy-absorbing efficiency and the like, and is widely applied to the passive safety fields of vehicles, civil engineering, ships and aerospace. Metallic impact beams are the most widely used type of energy absorbing member at present.

Under the axial impact condition, the thin-wall straight beam is subjected to progressive buckling deformation, and the energy absorption capacity and the energy absorption efficiency are excellent. However, under transverse impact, the thin-walled straight beam is mainly bent and deformed, and the energy absorption efficiency is about 1 order of magnitude lower than that under axial conditions. In order to improve the crashworthiness of the thin-walled beam under transverse load, multi-layer structures, multi-cell structures, gradient structures and the like are applied to the design of automobile bumpers. For example, patent No. 201610903059.0, an automotive bumper buffer structure, discloses a gradient multicellular automotive energy absorbing buffer device that improves energy absorbing performance by adding a grille buffer structure between a bumper beam and a bumper outer baffle.

Different from the method for improving the crashworthiness of the thin-wall beam under the transverse load, the arched structure can convert the transverse external force into the axial force, thereby obviously improving the crashworthiness of the thin-wall beam. The patent number 202120598342.3 discloses an arched energy absorption protection device, which has an arched middle part and straight line sections at two ends, and has excellent energy absorption and crashworthiness. However, the middle section of the device is a perfect circular arc arch, and can only be manufactured by casting and other methods, so that the production cost is high.

Disclosure of Invention

In order to meet the above defects or improvement demands of the prior art, the utility model provides an arch thin-wall anti-collision beam, and aims to better meet the practical application requirements of the anti-collision beam by arranging a buckling deformation part in the middle of a concave surface of an arch part so that the energy absorption efficiency of the anti-collision beam is superior to that of the anti-collision beam with a perfect middle arch section.

In order to achieve the above object, according to one aspect of the present utility model, there is provided an arched thin-walled impact beam, which is a thin-walled tube and is arched as a whole, including a straight line portion and an arched portion;

the straight line parts are symmetrically arranged along the tangential directions of the two ends of the arch part;

and a buckling deformation part is arranged in the middle of the concave surface of the arched part.

Preferably, the device further comprises end connection parts symmetrically arranged at two ends of the straight line part.

Preferably, the arch portion is internally filled with a porous material.

Preferably, the linear portion is internally filled with a porous material.

Preferably, the straight portion is of a different thickness than the arched portion to achieve local thickening of the arched portion.

Preferably, the cross section of the anti-collision beam is circular or polygonal.

Preferably, the section of the anti-collision beam is a single cell structure, a multi-cell structure or a combination structure of single cells and multi-cells.

According to another aspect of the present utility model, there is provided a manufacturing apparatus including a first fixed support, a second fixed support, and a ram;

the pressure head is arranged above the anti-collision beam, and one end of the pressure head is connected with the driving piece;

the first fixed supporting piece and the second fixed supporting piece are symmetrically arranged along the moving direction of the pressure head and are positioned below the anti-collision beam.

Preferably, the first and second fixed supports are each cylindrical in structure.

Preferably, the first and second fixed supports are horizontally movable.

In general, the above technical solutions conceived by the present utility model, compared with the prior art, enable the following beneficial effects to be obtained:

1. the utility model provides an arch thin-wall anti-collision beam which is an integral thin-wall pipe fitting and comprises an arch bending section in the middle and straight line sections at two sides. During the three-point bending process, the arch area of the anti-collision beam may be locally buckled and sunken or wrinkled and deformed, but the anti-collision beam still has excellent anti-collision performance, and the energy absorption efficiency is even better than that of the anti-collision beam with a perfect middle arch section. Under the three-point bending load, compared with the straight beam with the same material, section and span, the energy absorption efficiency of the anti-collision beam is about 2-3 times higher;

2. the arched thin-wall anti-collision beam provided by the utility model has the characteristics of low cost and high efficiency. The bending angle of the arched thin-wall anti-collision beam can be controlled by controlling the movement displacement of the pressure head and the span between two cylindrical supports in three-point bending. The length and deformation of the middle arch segment can be varied by controlling the shape and size of the ram and the span between the cylindrical supports. After three-point bending processing, cutting the end part of the arch thin-wall anti-collision beam to obtain the required end part size and shape, and installing and fixing the end part on a related structure in a welding or bolting mode;

3. the utility model absorbs energy by utilizing the deformation of the structure, and has excellent absorption efficiency. The cross-sectional shape of the thin-walled beam can be circular, rectangular or polygonal, and can be in the form of a single cell or multiple cells. The energy absorption efficiency and the crashworthiness of the arched thin-wall anti-collision beam can be further improved by carrying out three-point bending processing on the metal thin-wall beam filled with porous materials, the combined beam with the mutually nested thin-wall pipe fittings or the thin-wall straight beam with the gradient wall thickness. The arched anti-collision beams of different forms and sizes can also be combined and designed to obtain the anti-collision beam with specific buffering force-displacement response curve.

Drawings

FIG. 1 is a schematic structural view of an arched thin-walled impact beam constructed in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic structural view of a fabrication apparatus for an arched thin-walled impact beam according to an embodiment of the present utility model;

FIG. 3 is a schematic illustration of a three-point bending method for preparing arched thin-walled impact beams of different geometric parameters in accordance with an embodiment of the present utility model;

FIG. 4 is a schematic view of a process for producing an arched thin-walled impact beam according to a three-point bending method of an embodiment of the present utility model, wherein (a) in FIG. 4 is a schematic view of different cross-sectional shapes of the impact beam, and (b) in FIG. 4 is a schematic view of different combinations of the impact beams;

FIG. 5 is a schematic view of the structure of an arched thin-walled impact beam internally filled with porous material in accordance with an embodiment of the present utility model;

FIG. 6 is a schematic illustration of the structure of a thickened arch constructed in accordance with embodiments of the present utility model;

FIG. 7 is a schematic diagram of the combined design and application of arched thin-walled impact beams of different forms or sizes in accordance with an embodiment of the present utility model.

The same reference numbers are used throughout the drawings to reference like elements or structures, wherein: 1-an arched portion; 2-straight line portions; 3-end connection; 4-buckling deformation.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

As shown in fig. 1, the present utility model proposes an arched thin-walled impact beam, comprising an arched portion 1, a straight portion 2 and an end connection 3. The arch-shaped part 1 is positioned in the middle of the two straight parts 2. The middle part of the arched part 1 of the anti-collision beam is provided with a buckling deformation part 4, the buckling deformation part 4 is formed in the preparation process, and the anti-collision beam has excellent anti-collision performance and even better energy absorption efficiency than an anti-collision beam with a perfect middle arched section by arranging the buckling deformation part 4.

The utility model further provides a preparation device for preparing the arched thin-wall anti-collision beam, which comprises a first fixed support piece, a second fixed support piece and a pressure head; the pressure head is arranged above the anti-collision beam, and one end of the pressure head is connected with the driving piece; the first fixed supporting piece and the second fixed supporting piece are symmetrically arranged along the moving direction of the pressure head and are positioned below the anti-collision beam.

Further, as shown in fig. 2, the utility model provides an arched thin-wall anti-collision beam, and the preparation process of the arched thin-wall anti-collision beam comprises three steps: firstly, a metal thin-wall straight beam prepared by adopting extrusion forming and other processes is placed on two cylindrical fixed supports, then a pressure head is placed on the upper surface of the straight beam, and the pressure head is moved downwards to enable the straight beam to bend and deform, so that an arched thin-wall beam is obtained. Finally, the end part of the arched thin-wall beam is cut according to the requirement, the end part size and the shape required by practical application are obtained, and the arched thin-wall anti-collision beam is installed and fixed on a practical structure in a welding or bolting mode.

Further to illustrate, as shown in FIG. 3, the bending angle α of the arched thin-walled impact beam of the present utility model may be controlled by the displacement δ of the ram and the span S between the two cylindrical supports during the manufacturing process. When S is the same in the three-point bending process, the larger delta is, the larger alpha is; when δ is the same, the larger S is the smaller α of the impact beam. The ram may be cylindrical or other shapes. The length and deformation of the arch segments are related to the shape and size of the ram and can be controlled and adjusted by it.

Further to the description, as shown in fig. 4, the present utility model can be used for three-point bending preparation of thin-wall straight beams with various cross-sectional shapes or cross-sectional forms. The cross-sectional shape of the thin-walled beam can be circular, rectangular or polygonal, and can be in the form of single cell, multicellular or combined cross-section.

Further describing, as shown in fig. 5, the present utility model can perform three-point bending preparation on the metal thin-wall straight beam filled with the porous material, and further improve the energy absorption efficiency and the crashworthiness of the arched thin-wall crashproof beam.

Further describing, as shown in fig. 6, the present utility model can perform three-point bending preparation on the thin-wall straight beam with enhanced local thickness or gradient change in thickness along the longitudinal direction, so as to further improve the energy absorption efficiency and the crashworthiness of the arched thin-wall crashproof beam.

Further to the description, as shown in FIG. 7, the present utility model may be used to combine and design arched impact beams of different forms and sizes to provide impact beams having specific cushioning force-displacement response curves. The force-displacement response curve is obtained with a two-stage platform load.

It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.

Claims

1. An arch thin-wall anti-collision beam is characterized in that the anti-collision beam is a thin-wall pipe fitting and is integrally arch-shaped, and comprises a straight line part (2) and an arch part (1);

the straight line parts (2) are symmetrically arranged along the tangential directions of the two ends of the arch part (1);

the middle part of the concave surface of the arch part (1) is provided with a buckling deformation part (4).

2. An arched thin-walled impact beam according to claim 1, further comprising end connections (3), said end connections (3) being symmetrically disposed at both ends of the straight portion (2).

3. An arched thin-walled impact beam according to claim 1, wherein the arched portion (1) is internally filled with a porous material.

4. An arched thin-walled impact beam according to claim 1, wherein the straight portions (2) are internally filled with porous material.

5. An arched thin-walled impact beam according to claim 1, characterized in that the straight portions (2) are of different thickness than the arched portions (1) to achieve local thickening of the arched portions (1).

6. An arched thin-walled impact beam as claimed in claim 1, wherein the impact beam is circular or polygonal in cross-section.

7. The arched thin-walled impact beam of claim 1, wherein the impact beam has a single cell structure, a multicellular structure, or a combination of single and multicellular structures in cross-section.