High strength square tube

Abstract

The utility model discloses a high -strength square -rectangular tube relates to metal tubular product manufacturing technical field, include: by high -strength steel is made the pipe body, the cross section of pipe body is rectangular or square, be equipped with an inside stable frame in pipe body inside, the utility model discloses a inside stable frame that is made of pre -pressing support pole and built -in elastic core column this core structure, when force, through support pole and make it produce compression deformation to store energy to load transmission to elastic core column, when unloading, the energy that stores is released to elastic core column, through the restoring force of support pole to pipe body and exert, successfully outside impact kinetic energy is converted into the elastic potential energy of core column and is stored with high efficiency, solved the technical problem that traditional square -rectangular tube is easy to permanent deformation under dynamic load, difficult to restore original shape, thereby realized pipe body still can keep high resilience after high -strength impact, the excellent effect of remarkable resistance permanent deformation.

Description

Technical Field

[0001] This utility model relates to the field of metal pipe manufacturing technology, and in particular to a high-strength square and rectangular tube. Background Technology

[0002] Rectangular and square tubes are important structural profiles widely used in construction, machinery manufacturing and other fields. Traditionally, rectangular and square tubes are improved by increasing the wall thickness or setting internal rigid reinforcing ribs (such as partitions, ribs, etc.). Although these methods can improve the static strength of rectangular and square tubes to a certain extent, their design concept is essentially "passively resisting" external loads.

[0003] However, in practical applications, especially in scenarios such as seismic bracing and vehicle anti-collision structures, rectangular tubes not only have to bear static loads, but also often have to bear dynamic loads such as impacts and vibrations. Under such conditions, traditional rigid reinforced structures reveal obvious technical defects: when the load they bear exceeds the elastic limit of the material, the stress will quickly concentrate and cause the structure to undergo plastic hinges or local buckling, resulting in irreversible permanent deformation. Once such permanent deformation occurs, the load-bearing capacity of the component will decrease significantly, and it will be difficult to restore the original shape and function, seriously affecting the safety and service life of the structure.

[0004] Specifically, under cyclic dynamic loads, microcracks are easily generated and propagated at stress concentration points, leading to fatigue fracture; when subjected to axial impact, traditional square and rectangular tubes mainly absorb energy through plastic bending deformation, which is inefficient and prone to instantaneous buckling instability; traditional square and rectangular tubes are only used as structural components and it is difficult to integrate additional functions such as damping and sound insulation.

[0005] Therefore, a high-strength rectangular tube is proposed to solve the above problems. Utility Model Content

[0006] The purpose of this invention is to provide a square and rectangular tube that fundamentally improves dynamic performance, fatigue life and connection reliability from a structural design perspective, while also endowing it with excellent energy absorption and damping functions.

[0007] To achieve the above objectives, this utility model provides a high-strength rectangular tube. The utility model provides the following technical solution, comprising: a tube body made of high-strength steel, the tube body having a rectangular or square cross-section, and an internal stabilizing frame disposed inside the tube body; the internal stabilizing frame includes a built-in elastic core column made of elastic material, and four support rods that apply preload to the built-in elastic core column; the four support rods are arranged in a cross shape, with their ends respectively connected to the inner corner of the tube body and the outer peripheral surface of the built-in elastic core column, and the four support rods divide the interior of the tube body into four independent cavities; By using an integrated internal frame to coordinate stress distribution and converting impact energy into the deformation potential energy of the elastic core column, the resilience and resistance to permanent deformation of the tube are significantly improved.

[0008] Furthermore, the four struts are located within the same cross-section of the tube and are arranged along the two diagonal directions of the cross-section to form the most direct and efficient force transmission path, ensuring that the load from the corner of the tube can be quickly transmitted to the core elastic core column.

[0009] Furthermore, the strut is a rigid metal rod with an I-shaped cross-section. The long axis of the cross-section is perpendicular to the radial direction of the tube. Its two ends are fixedly connected to the inner corner of the tube and the built-in elastic core column, respectively. By utilizing the characteristic of the large moment of inertia of the I-shaped cross-section in the plane of force, the bending stiffness of the strut itself is greatly improved, preventing it from becoming unstable under pressure and ensuring the effective application and maintenance of preload.

[0010] Furthermore, the connection end between the strut and the built-in elastic core column is provided with an enlarged connector, which is partially or completely embedded inside the built-in elastic core column; the mechanical interlocking effect greatly increases the bonding area and depth between the strut and the elastic core column, effectively preventing interface peeling under alternating loads and ensuring long-term reliability of the connection.

[0011] Furthermore, the inner corner of the tube body is provided with an inwardly protruding mounting platform, and the end of the support rod is fixedly connected to the mounting platform to provide a stable mounting reference surface for the support rod, avoid stress concentration caused by direct connection with the curved tube wall, and strengthen the corner structure of the tube body itself.

[0012] Furthermore, the outer surface of the built-in elastic core column is provided with a positioning groove along its axial direction that matches the shape of the connector. The connector is set in the positioning groove to achieve precise positioning during assembly and further limit the displacement of the connector in the groove, making the overall integrity of the internal stable frame stronger and the force flow transmission smoother.

[0013] Furthermore, the built-in elastic core is made of polyurethane elastomer or high-strength rubber, and it is a solid column to ensure that the elastic core has a high elastic modulus and a large elastic deformation space, thereby storing and releasing sufficient elastic potential energy to achieve effective rebound of the tube.

[0014] Furthermore, the four independent cavities are filled with damping materials or energy-absorbing foam to further dissipate impact energy through the plastic deformation or internal friction of the damping materials. Combined with the core elastic recovery mechanism, this forms a double insurance of energy dissipation and rebound, comprehensively improving buffering and shock resistance performance.

[0015] Compared with the prior art, the beneficial effects achieved by this utility model are: This invention utilizes an internal stabilizing frame structure comprised of pre-stressed struts and an internal elastic core column. Under stress, the struts transfer the load to the elastic core column, causing it to compress and store energy. When unloaded, the elastic core column releases the stored energy, and the struts apply a restoring force to the tube body. This successfully and efficiently converts the external impact kinetic energy into the elastic potential energy of the core column and stores it. This solves the technical problem that traditional square and rectangular tubes are prone to permanent deformation under dynamic loads and are difficult to restore to their original shape. As a result, the tube body can maintain high resilience and significantly resist permanent deformation even after high-intensity impacts.

[0016] Compared to square tubes that simply increase rigidity, this invention not only improves strength but also achieves high resilience and impact fatigue resistance, which are not available in existing technologies. It is particularly suitable for fields with extremely high requirements for safety and recoverability, such as seismic bracing and anti-collision structures. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the tube body of this utility model; Figure 3 This is a schematic diagram of the installation structure of the positioning groove in this utility model; Figure 4 This is a schematic diagram of the installation structure of the internal stabilizing frame in this utility model.

[0019] In the diagram: 1. Tube body; 2. Built-in elastic core column; 3. Support rod; 4. Cavity; 11. Mounting platform; 21. Positioning groove; 31. Connector. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 4 This utility model provides a high-strength square and rectangular tube, including a tube body 1 made of Q345B high-strength steel, the cross-section of the tube body 1 being a standard square; and a highly integrated internal stabilizing frame is provided inside the tube body 1. The core of the internal stabilizing frame is an internal elastic core column 2 made of polyurethane elastomer. The core column is a solid cylinder that extends along the entire length of the tube 1. The internal elastic core column 2 is connected to the tube 1 by four support rods 3. These four support rods 3 are made of Q235 steel and have an I-shaped cross-section. The major axis of the I-shape is perpendicular to the radial direction of the tube 1 to maximize its bending moment of inertia in the plane of force. The four support rods 3 are located in the same cross section of the tube body 1 and are arranged in a cross shape along the two diagonals of the tube body cross section. The two ends of each support rod 3 are fixedly connected to the inner corner of the tube body 1 and the outer peripheral surface of the built-in elastic core column 2 by welding. The key point is that during assembly, after the four support rods 3 are installed in place, they all apply pre-pressure to the central built-in elastic core column 2, so that it is in a continuous pre-compression state. These four support rods 3 divide the interior of the tube body 1 into four independent cavities 4 that extend along the length direction.

[0022] By using the pre-compression strut 3 to force the built-in elastic core 2 into a pre-compression state, it becomes a huge elastic potential energy reserve. When the tube 1 is bent under load, the load is converted into further compression of the built-in elastic core 2 through the strut 3, which efficiently converts the impact kinetic energy into recoverable elastic potential energy. After the load is released, the potential energy is released, generating a strong restoring torque, which actively drives the tube 1 to rebound, thus fundamentally solving the technical bottleneck of traditional square and rectangular tubes being prone to permanent deformation. Compared to existing technologies that simply add rigid support to square tubes, this invention not only improves strength but also achieves high resilience and impact fatigue resistance, which are not available in existing technologies. It is particularly suitable for fields with extremely high requirements for safety and recoverability, such as seismic bracing and anti-collision structures.

[0023] For further details in this embodiment, please refer to [link / reference]. Figure 4 To further improve the reliability of the connection, an integrally formed enlarged connector 31 is provided at the connection end between the support rod 3 and the built-in elastic core column 2. Correspondingly, a positioning groove 21 that precisely matches the shape of the connector 31 is opened on the outer surface of the built-in elastic core column 2 along its axial direction. During assembly, the connector 31 is pressed into and completely embedded in the positioning groove 21 to form a firm mechanical interlock. Meanwhile, at the four inner corners of the tube body 1, an inwardly protruding mounting platform 11 is integrally formed by cold rolling. The end of the support rod 3 is fixedly connected to the plane of the mounting platform 11 by full welding. This not only provides a flat and stable mounting base, but also strengthens the corner structure of the tube body itself.

[0024] In a preferred embodiment, the four independent cavities 4 are filled with high-performance closed-cell polyurethane foam as damping material. The two ends of these cavities 4 are sealed by sealing caps (not shown in the figure) to form a complete sealed structure. This design not only ensures the stability of the damping material's performance under long-term vibration and harsh environment and prevents moisture absorption and aging, but also endows the rectangular tube with excellent buffering and energy absorption characteristics, extending its function from simple structural support to the field of passive safety protection.

[0025] Specifically, when this invention is applied to an automotive bumper anti-collision beam, its working mechanism is as follows: In the event of a low-speed collision, the tube 1 begins to deform, the internal stabilizing frame activates, the elastic core column 2 stores most of the collision energy through deformation, while the closed-cell polyurethane foam in the cavity 4 irreversibly dissipates the remaining energy through its own efficient compression deformation, working together to reduce impact acceleration and protect the main body structure of the vehicle. After the collision, the potential energy stored in the elastic core column 2 drives the bumper to return to its original shape or close to its original shape, realizing the innovative function of recoverable energy absorption. This not only reduces the repair cost after a low-speed collision but also provides excellent buffering performance for pedestrian protection.

[0026] Through this deep integration of structure and function, this utility model successfully upgrades a basic building profile into a high-value-added component suitable for the automotive industry, special equipment, and other industries with stringent requirements for lightweighting, high safety, and recoverability.

[0027] In summary, when the rectangular tube acts as a diagonal brace of the seismic support and is subjected to axial pressure or lateral impact load F, the tube body 1 will tend to bend. At this time, the two support rods 3 located on the diagonal of the tube body will be further stretched, and the load transmitted from the mounting platform 11 to which it is connected will be efficiently transferred to the connector 31 through its I-shaped cross section, and finally act on the built-in elastic core column 2, causing it to undergo further compression deformation. In this process, the kinetic energy of the external impact is efficiently converted into the elastic potential energy of the elastic core column 2 and stored.

[0028] When the impact load is released, the compressed elastic core 2 will release its stored elastic potential energy and generate a strong restoring force. This restoring force acts in the opposite direction on the inner corner of the tube 1 through the strut 3, forming a restoring torque that drives the tube 1 to return to a straight state. At the same time, the damping material filled in the cavity 4 will undergo shear deformation and internal friction during the deformation of the tube, irreversibly dissipating a portion of the impact energy and playing a role in buffering and reducing the peak impact force.

[0029] This utility model constructs a highly integrated and stable frame through the integrated design of cross-shaped struts 3, embedded connectors 31, corner mounting platforms 11, and positioning grooves 21. The I-shaped struts 3 ensure efficient force transmission, while the mechanical interlocking structure significantly improves connection reliability, forming a composite structure that is rigid on the outside and flexible on the inside. At the same time, by filling the four independent cavities 4 with damping material, a dual protection mechanism is formed together with the elastic core column, which is mainly based on elastic rebound and supplemented by damping energy dissipation. This not only ensures the structural recovery ability but also significantly improves the buffering effect, enabling the square and rectangular tube to have better comprehensive performance under complex working conditions.

[0030] The parts not covered in this utility model are the same as or can be implemented using existing technologies.

[0031] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-strength rectangular tube, comprising a tube body (1) made of high-strength steel, wherein the cross-section of the tube body (1) is rectangular or square, characterized in that: An internal stabilizing frame is provided inside the tube (1); the internal stabilizing frame includes a built-in elastic core column (2) made of elastic material, and four support rods (3) that apply preload to the built-in elastic core column (2); the four support rods (3) are arranged in a cross shape, and their two ends are respectively connected to the inner side of the corner of the tube (1) and the outer peripheral surface of the built-in elastic core column (2); the four support rods (3) divide the interior of the tube (1) into four independent cavities (4). The four support rods (3) are located in the same cross section of the tube (1) and are arranged along the two diagonal directions of the cross section. The support rod (3) is a rigid metal rod with an I-shaped cross section. The long axis of the cross section is perpendicular to the radial direction of the tube (1). Its two ends are fixedly connected to the inner corner of the tube (1) and the built-in elastic core (2) respectively.

2. The high-strength square and rectangular tube according to claim 1, characterized in that: The connection end of the support rod (3) and the built-in elastic core column (2) is provided with an enlarged connector (31), which is partially or completely embedded inside the built-in elastic core column (2).

3. A high-strength square and rectangular tube according to claim 2, characterized in that: The inner corner of the tube (1) is provided with an inwardly protruding mounting platform (11), and the end of the support rod (3) is fixedly connected to the mounting platform (11).

4. A high-strength square and rectangular tube according to claim 3, characterized in that: The outer surface of the built-in elastic core (2) is provided with a positioning groove (21) that matches the shape of the connector (31) along its axial direction, and the connector (31) is disposed in the positioning groove (21).

5. A high-strength square and rectangular tube according to claim 1, characterized in that: The built-in elastic core (2) is made of polyurethane elastomer or high-strength rubber and is a solid column.

6. A high-strength square and rectangular tube according to claim 1, characterized in that: The four independent cavities (4) are filled with damping material or energy-absorbing foam.

Images