Aluminum pipe vertical connection device

Abstract

The application discloses a vertical connecting device for aluminum pipes, which comprises a vertical aluminum pipe, a horizontal aluminum pipe, a screw aluminum plate, an upper pressing plate and a screw. The vertical aluminum pipe and the horizontal aluminum pipe are vertically arranged and the surfaces of the vertical aluminum pipe and the horizontal aluminum pipe are attached to each other. The upper pressing plate is provided with a first boss, and the vertical aluminum pipe is provided with a first lock hole. The first boss and the first lock hole are of the same shape and size and are designed as an interference fit. The screw aluminum plate is provided with a second boss, and the horizontal aluminum pipe is provided with a second lock hole. The second boss and the second lock hole are of the same shape and size and are designed as an interference fit. The vertical aluminum pipe, the horizontal aluminum pipe, the screw aluminum plate and the upper pressing plate are fastened and connected from top to bottom by at least four screws. The device is based on the vertical connection and anti-hole expansion mechanism of the aluminum pipe realized by the inlaid parts in the small-volume aluminum pipe. The simple mechanical design of the vertical connection of the aluminum pipe is realized by a more reliable and simple mechanical structure.

Description

Technical Field

[0001] This invention relates to a vertical connection device for aluminum tubes, and more particularly to a vertical connection mechanism for aluminum tubes based on screw aluminum plates and upper pressure plates to prevent hole enlargement; it is mainly used for reliable connection of mutually perpendicular aluminum tubes in robots with aluminum tube frames. Background Technology

[0002] Vertical connection of aluminum tubes is a key technology for small robots based on aluminum tube frames. Currently, vertical connections of aluminum tubes for robots or engineering applications are mainly divided into three categories: welding, bolts and nuts, and tenons / mortises. However, each technology has its own significant shortcomings. Welding-based connections are difficult to assemble and disassemble; if any component is damaged, the entire aluminum tube frame must be replaced. Welded joints are also uneven, and the welding process is difficult to control in terms of precision. Bolt / nut connections are complex to assemble, use non-standard connectors, are costly and bulky, and under load, screws can cause significant enlargement of the aluminum tube holes over time, leading to misalignment and affecting accuracy. Tenons / mortises are costly to manufacture after designing the tenon / mortise structure, and their impact on the strength of the aluminum tube frame is significant. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects in the prior art and to propose a vertical connection and anti-expansion mechanism for aluminum tubes based on embedded parts in small-volume aluminum tubes. This invention provides a simple mechanical design for vertical connection of aluminum tubes, achieving a more reliable and simpler mechanical structure for vertical connection of aluminum tubes.

[0004] The objective of this invention can be achieved by adopting the following technical solutions:

[0005] A vertical aluminum tube connection device comprises five parts: a vertical aluminum tube 1, a horizontal aluminum tube 2, a screw aluminum plate 3, an upper pressure plate 4, and screws 5.

[0006] The vertical aluminum tube 1 and the horizontal aluminum tube 2 are arranged vertically and their surfaces are in contact with each other. The through holes on the aluminum tubes are aligned with each other and assembled in a concentric relationship.

[0007] The upper pressure plate 4 is fixedly installed on the inner side of the vertical aluminum tube 1, and the screw aluminum plate 3 is fixedly installed on the inner side of the horizontal aluminum tube 2.

[0008] The upper pressure plate 4 is provided with a first boss, and the vertical aluminum tube 1 is provided with a first locking hole. The first boss and the first locking hole have the same shape and size and are designed to be interference fit. The purpose is to transfer the force on the upper pressure plate 4 to the first locking hole through the first boss, so as to disperse the force and avoid the force on the upper pressure plate 4 being entirely applied to the inner side of the vertical aluminum tube 1, causing a large stress concentration.

[0009] The screw aluminum plate 3 is provided with a second boss, and the horizontal aluminum tube 2 is provided with a second locking hole. The second boss and the second locking hole have the same shape and size and are designed to be interference fit. The purpose is to transfer the force of the screw aluminum plate 3 to the second locking hole through the second boss, so as to disperse the force and avoid the force of the screw aluminum plate 3 being entirely applied to the inner wall of the horizontal aluminum tube 2, causing a large stress concentration.

[0010] The vertical aluminum tube 1, horizontal aluminum tube 2, screw aluminum plate 3, and upper pressure plate 4 are respectively fastened together from top to bottom by at least 4 screws 5, so that the device forms a fixed whole.

[0011] Furthermore, the shapes of the first boss and the first lock hole are triangular, quadrilateral, polygonal or circular. Different shapes can be selected to match according to the force of the mechanism, but the interference relationship between the first boss and the first lock hole must be ensured. Any matching shape extension that plays the same role is within the protection scope of the technical solution of the present invention. The above examples do not constitute a limitation of the technical solution of the present invention.

[0012] Furthermore, the second boss and the second lock hole are both triangular, quadrilateral, polygonal or circular in shape. Different shapes can be selected to match according to the force of the mechanism, but the interference relationship between the second boss and the second lock hole must be ensured. Any matching shape extension that plays the same role is within the protection scope of the technical solution of the present invention. The above examples do not constitute a limitation of the technical solution of the present invention.

[0013] Furthermore, the upper pressure plate 4 has four mounting holes at its four corners, and the vertical aluminum tube 1 has four first through holes. The four mounting holes of the upper pressure plate 4 and the four first through holes of the vertical aluminum tube 1 are aligned with each other and assembled in a concentric relationship, thereby completely restricting the relative positional relationship between the upper pressure plate 4 and the vertical aluminum tube 1.

[0014] Furthermore, the screw aluminum plate 3 has four threaded holes at its four corners, and the horizontal aluminum tube 2 has four second through holes. The four threaded holes of the screw aluminum plate 3 and the four second through holes of the horizontal aluminum tube 2 are aligned with each other and assembled in a concentric relationship, thereby completely restricting the relative positional relationship between the screw aluminum plate 3 and the horizontal aluminum tube 2.

[0015] Furthermore, the four screws 5 pass through the mounting hole of the upper pressure plate 4, the first through hole of the vertical aluminum tube 1, the second through hole of the horizontal aluminum tube 2, and the screw aluminum plate 3 from top to bottom, and engage with the threaded hole of the screw aluminum plate 3. By tightening the four screws 5, the vertical aluminum tube 1, the horizontal aluminum tube 2, the screw aluminum plate 3, and the upper pressure plate 4 are pressed and fixed together, and the device forms a fixed whole. When a component needs to be replaced, the device can be fixed by removing the four screws 5, replacing the corresponding component, and then fixing it again according to the above connection steps.

[0016] Furthermore, an upper pressure plate 4 is installed inside the wall of the vertical aluminum tube 1. The first boss on the upper pressure plate 4 has the same shape and basic size as the first locking hole of the vertical aluminum tube 1, and is designed to be an interference fit. The mounting hole of the upper pressure plate 4 is aligned with the first through hole of the vertical aluminum tube 1, and is assembled in a concentric relationship.

[0017] A screw aluminum plate 3 is installed inside the wall of the horizontal aluminum tube 2. The second boss of the screw aluminum plate 3 has the same shape and basic size as the second locking hole of the horizontal aluminum tube 2, and is designed to be an interference fit. The threaded hole of the screw aluminum plate 3 is aligned with the second through hole of the horizontal aluminum tube 2. Four screws 5 pass through the mounting hole of the upper pressure plate 4, the first through hole of the vertical aluminum tube 1, the second through hole of the horizontal aluminum tube 2, and the screw aluminum plate 3 from top to bottom, and are engaged with the threaded hole of the screw aluminum plate 3. By tightening the four screws 5, the vertical aluminum tube 1, the horizontal aluminum tube 2, the screw aluminum plate 3, and the upper pressure plate 4 are pressed and fixed together.

[0018] The present invention has the following advantages and effects compared with the prior art:

[0019] 1. The aluminum tube vertical connection structure disclosed in this invention has a simple principle, high interchangeability of parts, and is easy to manufacture.

[0020] 2. The aluminum tube vertical connection structure disclosed in this invention can effectively increase the stress-bearing area at the truss connection. By utilizing the inherent advantages of the aluminum tube structure, it greatly reduces the stress concentration caused by the shear force of the bolt group on the aluminum tube surface in the threaded connection structure, as well as the problem of rapid fatigue damage of the mechanism after bolt loosening indirectly caused by the large bolt preload. It has a significant effect on suppressing the fatigue hole expansion phenomenon caused by long-term stress concentration at the aluminum tube connection and is suitable for the connection of aluminum tube frames used in robots and engineering machinery.

[0021] 3. The vertical connection structure of aluminum tubes disclosed in this invention is realized inside the connected aluminum tubes. Compared with the widely used welding structure, there are no weld protrusions on the surface of the aluminum tubes, the volume is smaller and more beautiful, and the deformation caused by welding is avoided. It is suitable for mechanical designs with high connection accuracy requirements.

[0022] 4. The vertical connection structure of aluminum tube disclosed in this invention realizes its function through the upper pressure plate, screw aluminum plate and the hollow on the aluminum tube. The parts production cost is low, the requirements for production equipment are low, no special environment is required for connection and disassembly, replacement is fast and repair is easy. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0024] Figure 1 This is a schematic diagram of the overall structure of the vertical connection device for aluminum tubes disclosed in this invention.

[0025] Figure 2 This is a cross-sectional view of the overall structure of the vertical aluminum tube connection device disclosed in this invention.

[0026] Figure 3 This is a schematic diagram of the vertical aluminum tube in the vertical aluminum tube connection device disclosed in this invention;

[0027] Figure 4 This is a top view of the horizontal aluminum tube in the vertical aluminum tube connection device disclosed in this invention.

[0028] Figure 5 This is a schematic diagram of the upper pressure plate in the vertical aluminum tube connection device disclosed in this invention;

[0029] Figure 6 This is a schematic diagram of the screw aluminum plate in the vertical connection device for aluminum tubes disclosed in this invention.

[0030] Figure 7 This is a simulation analysis diagram based on the aluminum tube vertical connection device disclosed in this invention, with the first lock hole, the second lock hole, the screw aluminum plate, and the upper pressure plate removed.

[0031] Figure 8 This is a simulation analysis diagram based on the aluminum tube vertical connection device disclosed in this invention, with the first boss, the first locking hole, the second boss, and the second locking hole removed.

[0032] Figure 9 This is a simulation analysis diagram of the vertical connection device for aluminum tubes disclosed in this invention;

[0033] The reference numerals in the attached drawings are explained as follows: 1-vertical aluminum tube, 2-horizontal aluminum tube, 3-screw aluminum plate, 4-upper pressure plate, 5-screw. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1

[0036] Figure 1 This is a structural diagram of a vertically connected aluminum tube assembly. To clearly show the relative positions, the components are shown in cross-section, as shown in the cross-sectional view. Figure 2 A vertical aluminum tube connection comprises five parts: a vertical aluminum tube 1, a horizontal aluminum tube 2, a screw aluminum plate 3, an upper pressure plate 4, and screws 5.

[0037] The size, shape, and positional relationship of the first through hole and the first key hole of the vertical aluminum tube 1 are shown in the figure. Figure 3 The size and positional relationship of the second through hole and the second lock hole of the horizontal aluminum tube 2 are shown in the figure. Figure 4 The size and positional relationship between the first boss of the upper pressure plate 4 and the mounting hole are shown in the figure. Figure 5 The size and positional relationship between the second boss of the screw aluminum plate 3 and the threaded hole are shown in the figure. Figure 6 .

[0038] An assembly for vertically connecting aluminum tubes includes the following parts: An upper pressure plate 4 is installed inside the wall of a vertical aluminum tube 1. The first boss on the upper pressure plate 4 has the same shape and basic dimensions as the first locking hole of the vertical aluminum tube 1, designed for an interference fit. The mounting hole of the upper pressure plate 4 is aligned with the first through hole of the vertical aluminum tube 1, maintaining a concentric assembly. A screw aluminum plate 3 is installed inside the wall of a horizontal aluminum tube 2. The second boss of the screw aluminum plate 3 has the same shape and basic dimensions as the second locking hole of the horizontal aluminum tube 2, designed for an interference fit. The threaded hole of the screw aluminum plate 3 is aligned with the second through hole of the horizontal aluminum tube 2. Four screws 5, from top to bottom, pass through the mounting hole of the upper pressure plate 4, the first through hole of the vertical aluminum tube 1, the second through hole of the horizontal aluminum tube 2, and the screw aluminum plate 3, with the screws 5 engaging with the threaded hole of the screw aluminum plate 3. By tightening four screws 5, the vertical aluminum tube 1, horizontal aluminum tube 2, screw aluminum plate 3, and upper pressure plate 4 are pressed together, thus fixing the eight components—vertical aluminum tube 1, horizontal aluminum tube 2, screw aluminum plate 3, upper pressure plate 4, and four screws 5—into a whole and mutually restricting each other.

[0039] Therefore, four screws 5 press and fasten the contact surfaces of the vertical aluminum tube 1, the horizontal aluminum tube 2, the screw aluminum plate 3, and the upper pressure plate 4. When this vertical connection structure of aluminum tubes receives the force and torque transmitted from the aluminum tubes, the interference fit between the first boss of the upper pressure plate 4 and the first locking hole of the vertical aluminum tube 1, and the interference fit between the second boss of the screw aluminum plate 3 and the second locking hole of the horizontal aluminum tube 2, disperses the shear force of the four screws 5 on the aluminum tubes to the larger areas of the first and second locking holes. Also, due to the contact between the upper pressure plate 4 and the inner wall of the vertical aluminum tube 1, and the contact between the screw aluminum plate 3 and the inner wall of the horizontal aluminum tube 2, the shear force and torque of the four screws 5 on the aluminum tubes are dispersed to the inner walls of the vertical aluminum tube 1 and the horizontal aluminum tube 2. All of these prevent deformation of the vertical aluminum tube 1 and the horizontal aluminum tube 2 caused by stress concentration from the screws 5, thus avoiding fatigue and hole expansion, resulting in a more stable structure.

[0040] When a component is damaged, the fixed connection can be released by removing four screws (5), the damaged component can be replaced, and then the components can be reassembled and the connection restored according to the aforementioned assembly sequence. Therefore, in actual use, if several parts of a vertical connection of an aluminum tube are damaged, those parts can be replaced directly without affecting other connections.

[0041] Example 2

[0042] This embodiment conducts a static simulation analysis on a vertical connection of aluminum tubes. The results confirm that the vertical connection structure of aluminum tubes included in this patent can reduce stress concentration and has a significant effect on suppressing the fatigue and hole expansion phenomenon caused by long-term stress concentration at the connection of aluminum tubes. The specific analysis content is as follows.

[0043] For ease of analysis, the simplified mechanism and conditions excluding the main parts of the vertical aluminum tube connection device covered by the technical solution of this invention are as follows: The vertical aluminum tube 1 and horizontal aluminum tube 2, symmetrically cut at both ends for analysis, include the parts required for a vertical aluminum tube connection device; according to the design materials, the materials defined for the vertical aluminum tube 1, horizontal aluminum tube 2, screw aluminum plate 3, and upper pressure plate 4 are all 6061 aluminum alloy; since the rigidity of alloy steel is much greater than that of 6061 aluminum alloy, the four screws 5, made of alloy steel, are defined as absolutely rigid bodies. The deformation of the four screws 5 is considered; based on the material characteristics and usage, the preload of the four screws 5 is defined as negligible, and the friction between the vertical aluminum tube 1 and the horizontal aluminum tube 2 is defined as negligible; based on the possible forces during use, the force conditions are defined as follows: the vertical aluminum tube 1 is subjected to a uniformly distributed load along the direction of the vertical aluminum tube 1, with a total force of 200 N; the side of the vertical aluminum tube 1 away from the horizontal aluminum tube 2 is subjected to a uniformly distributed load along the direction of the horizontal aluminum tube 2, with a total force of 200 N; based on the relative forces, the horizontal aluminum tube 2 is defined as being absolutely fixed as a whole due to external factors.

[0044] To make a comparison and highlight the advantages of each component of a vertical aluminum tube connection device, a simulation was performed on the device after removing the screw aluminum plate 3, the upper pressure plate 4, the first locking hole of the vertical aluminum tube 1, and the second locking hole of the horizontal aluminum tube 2. The results are as follows: Figure 7 To facilitate the presentation of the simulation results for vertical aluminum tube 1, the structure and constraints of both vertical aluminum tube 1 and horizontal aluminum tube 2 were hidden. The results show that stress concentrations exceeding the yield limit exist at the first and second through holes, indicating structural insecurity. Simulations were performed on the device after removing the second boss of screw-operated aluminum plate 3, the first boss of upper pressure plate 4, the first locking hole of vertical aluminum tube 1, and the second locking hole of vertical aluminum tube 2. The results are as follows... Figure 8 To facilitate the presentation of the simulation results for vertical aluminum tube 1, the structure and constraints of both vertical aluminum tube 1 and horizontal aluminum tube 2 were hidden. The results show that the stress concentrations at the first and second through holes were eliminated, but new stress concentrations appeared on the sidewalls of vertical aluminum tube 1 and horizontal aluminum tube 2, and the maximum stress exceeded the yield limit, indicating structural insecurity. A simulation of a vertical aluminum tube connection device that fully conforms to the specifications was performed, and the results are as follows: Figure 9 To facilitate the presentation of the simulation results for vertical aluminum tube 1, the structure and constraints of both vertical aluminum tube 1 and horizontal aluminum tube 2 were hidden. The results show that stress concentration at the first and second through holes was eliminated. A portion of the stress on the sidewalls of vertical aluminum tube 1 and horizontal aluminum tube 2 was correspondingly dispersed to the first locking hole of vertical aluminum tube 1 and the second locking hole of vertical aluminum tube 2. Although some stress concentration still exists on the sidewalls of vertical aluminum tube 1 and horizontal aluminum tube 2, it has been greatly reduced and is within a safe range.

[0045] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A vertical connection device for aluminum tubes, characterized in that, The vertical aluminum tube connection device includes a vertical aluminum tube (1), a horizontal aluminum tube (2), a screw aluminum plate (3), an upper pressure plate (4), and screws (5). The vertical aluminum tube (1) and the horizontal aluminum tube (2) are arranged vertically and their surfaces are in contact with each other. The upper pressure plate (4) is fixedly installed on the inner side of the vertical aluminum tube (1), and the screw aluminum plate (3) is fixedly installed on the inner side of the horizontal aluminum tube (2). The upper pressure plate (4) is provided with a first boss, and the vertical aluminum tube (1) is provided with a first locking hole. The first boss and the first locking hole have the same shape and size and are designed to be interference fit. The screw aluminum plate (3) is provided with a second boss, and the horizontal aluminum tube (2) is provided with a second locking hole. The second boss and the second locking hole have the same shape and size and are designed to be interference fit. The vertical aluminum tube (1), horizontal aluminum tube (2), screw aluminum plate (3), and upper pressure plate (4) are respectively fastened from top to bottom by at least 4 screws (5).

2. The vertical connection device for aluminum tubes according to claim 1, characterized in that, The first boss and the first keyhole are both triangular, quadrilateral, polygonal or circular in shape.

3. The vertical connection device for aluminum tubes according to claim 1, characterized in that, The second boss and the second keyhole are both triangular, quadrilateral, polygonal or circular in shape.

4. The vertical connection device for aluminum tubes according to claim 1, characterized in that, The upper pressure plate (4) has four mounting holes at its four corners, and the vertical aluminum tube (1) has four first through holes. The four mounting holes of the upper pressure plate (4) and the four first through holes of the vertical aluminum tube (1) are aligned with each other and assembled in a concentric relationship.

5. The vertical connection device for aluminum tubes according to claim 4, characterized in that, The screw aluminum plate (3) has four threaded holes at its four corners (top, bottom, left, and right) and the horizontal aluminum tube (2) has four second through holes. The four threaded holes of the screw aluminum plate (3) and the four second through holes of the horizontal aluminum tube (2) are aligned with each other and assembled in a concentric relationship.

6. The vertical connection device for aluminum tubes according to claim 5, characterized in that, Four screws (5) pass through the mounting hole of the upper pressure plate (4), the first through hole of the vertical aluminum tube (1), the second through hole of the horizontal aluminum tube (2), and the screw aluminum plate (3) from top to bottom, and cooperate with the threaded hole of the screw aluminum plate (3). By tightening the four screws (5), the vertical aluminum tube (1), the horizontal aluminum tube (2), the screw aluminum plate (3), and the upper pressure plate (4) are pressed and fixed together.

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