Rectangular tube quick butt joint structure

Abstract

This invention discloses a quick-connect structure for rectangular tubes, comprising two rectangular tubes, with mounting holes penetrating the rectangular tubes on the sidewalls near the end faces where they are to be joined; the distance between the two mounting holes is set as A, after the end faces of the two rectangular tubes abut against each other; a liner tube can be inserted into the inner cavity of the rectangular tubes; two connecting holes of the same size as the mounting holes are formed on the sidewalls of the liner tubes; the distance between the two connecting holes is set as B; wherein A is slightly larger than B; the liner tube is inserted into the joint between the two rectangular tubes; two pin structural members are respectively inserted through the two pairs of misaligned mounting holes and connecting holes, thereby driving the two rectangular tubes to come close together and connect into one unit. This invention can tightly and reliably connect two rectangular tubes, and the connecting device is located inside the rectangular tubes, without increasing the outer contour of the rectangular tubes, making it convenient for use as a track.

Description

Technical Field

[0001] This invention belongs to the field of profile installation and application technology, specifically a quick-connect structure for rectangular tubes. Background Technology

[0002] A tube with a rectangular cross-section is simply called a rectangular tube. It has a hollow interior and is characterized by its light weight and high structural strength, making it widely applicable. Besides being used to construct structural components, rectangular tubes can also be used as tracks, providing a track foundation for the wheels of traveling mechanisms.

[0003] The joining of rectangular tubes is a relatively common technical issue. However, when these rectangular tubes are used as tracks, the traditional methods of joining them have the following problems: First, the joint between the two sections of rectangular tubes is relatively large, and they are not tightly joined together, resulting in significant bumps when the wheels are moving. Second, the structural strength at the joint is insufficient, making it difficult to provide adequate support for the wheels. Third, the connecting devices traditionally used enlarge the cross-sectional profile, easily becoming obstacles to the movement of the wheels. Fourth, for ease of inspection and maintenance, welding should not be used when connecting the two sections of rectangular tubes to maintain a detachable state. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a quick docking structure for rectangular tubes, the purpose of which is to dock two rectangular tubes tightly and reliably to achieve sufficient connection strength; on this basis, efforts are made to set the connecting device inside the rectangular tube without increasing the outer contour of the rectangular tube, so as to facilitate its use as a track.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a quick-connect structure for rectangular tubes, comprising two rectangular tubes with the same cross-sectional shape; further comprising a liner and pin structural members; mounting holes penetrating the rectangular tubes are provided on the sidewalls near the end faces of the rectangular tubes where they are connected; the distance between the two mounting holes after the end faces of the two rectangular tubes abut each other is set as A; the liner is inserted into the joint between the two rectangular tubes, and two connecting holes of the same size as the mounting holes are provided on the sidewalls of the liner; the distance between the two connecting holes is set as B; and A is slightly larger than B, so that when the two rectangular tubes are connected, the center of the connecting hole and the center of the mounting hole are slightly misaligned; the two pin structural members are respectively inserted through the two misaligned pairs of mounting holes and connecting holes, for driving the two rectangular tubes to come close together and connect into one unit.

[0006] As a further optimization, the outer contour of the liner corresponds to the inner wall of the rectangular tube, so that when the liner is inserted into the rectangular tube, all four inner walls of the rectangular tube can be supported by the liner.

[0007] As a further optimization, the length of the pin structure is slightly less than or equal to the thickness of the rectangular tube, so that neither the upper nor lower ends of the pin structure extend beyond the outer wall of the rectangular tube.

[0008] As a further optimization, A is 0.5mm to 2mm larger than B.

[0009] As a further optimization, A is 1mm larger than B.

[0010] As a further optimization, both the rectangular tube and the liner are made of aluminum alloy.

[0011] As a further optimization, the pin structure includes an upper locking cone ring, a lower locking cone ring, an internal hex bolt, and two expansion half-rings; the upper and lower ends of the expansion half-rings are provided with tapered hole surfaces, which are respectively used to mate with the tapered axial surfaces of the upper locking cone ring and the lower locking cone ring; the upper locking cone ring is provided with a through hole in the center; the lower locking cone ring is provided with a threaded hole in the center; the end of the internal hex bolt passes through the through hole and is screwed into the threaded hole.

[0012] As a further optimization, the outer wall of the expansion semi-ring is provided with a groove for fitting a rubber band.

[0013] This invention also provides a method for quick docking of rectangular tubes, utilizing the quick docking structure of rectangular tubes as described above, including the following steps:

[0014] S1: Insert the liner into the joint between the two rectangular tubes so that the center of the connecting hole is slightly misaligned with the center of the mounting hole;

[0015] S2: Insert the two pin structural members through the two pairs of misaligned mounting holes and connecting holes respectively, so that the two rectangular tubes are closely brought together and connected as one.

[0016] The beneficial effects of this invention are as follows:

[0017] (1) The joint between the two rectangular tubes is tight enough to reduce the bumps when the wheels are moving.

[0018] (2) The joint of the two rectangular tubes has high structural strength, which can provide sufficient support for the wheel;

[0019] (3) The connecting device does not protrude from the outer contour of the rectangular tube, but is embedded inside the rectangular tube, making it convenient to use as a track;

[0020] (4) The pin structure can be quickly and easily disassembled and installed, and maintenance is convenient.

[0021] In summary, the present invention can connect two rectangular tubes tightly and reliably, and the connecting device is set inside the rectangular tube without increasing the outer contour of the rectangular tube, making it convenient for use as a track. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the working principle of the docking structure in Embodiment 1 of the present invention;

[0023] Figure 2 This is an exploded view of the docking structure of Embodiment 1 of the present invention;

[0024] Figure 3 This is a cross-sectional structural diagram of the pin structure of Embodiment 1 of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of a rectangular bend pipe connection according to Embodiment 2 of the present invention.

[0026] The correspondence between the technical features in the figure and the reference numerals is as follows: rectangular tube 1; mounting hole 11; liner 2; connecting hole 21; pin structure 3; upper locking cone ring 31; lower locking cone ring 32; internal hex bolt 33; expansion half ring 34; tapered hole surface 35; tapered shaft surface 36; through hole 37; threaded hole 38; groove 39; rectangular bend 4. Detailed Implementation

[0027] 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 preferred embodiments of the present invention, and not all embodiments. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0028] Example 1: Please refer to Figure 1-3 ;

[0029] This invention provides the following technical solution: a quick-connect structure for rectangular tubes, used as a track for connecting two rectangular tubes 1 with identical cross-sectional shapes. The exemplary rectangular tube 1 is an aluminum alloy profile, which is easy to manufacture, low in cost, and has a strong load-bearing capacity; specifically, it includes two rectangular tubes 1, a liner 2, and a pin structure 3.

[0030] A mounting hole 11 is provided on the side wall near the end face of the rectangular tube 1, penetrating the rectangular tube 1; so that the hole distance between the two mounting holes 11 after the end faces of the two rectangular tubes 1 abut against each other is set as A; more preferably, the distance from the two mounting holes 11 to the end face is equal, so that the structure of both ends of each rectangular material is exactly the same, improving versatility and facilitating installation.

[0031] The liner 2 can be inserted into the inner cavity of the rectangular tube 1; two connecting holes 21 of the same size as the mounting hole 11 are opened on the side wall of the liner 2; the distance between the two connecting holes 21 is set to B; wherein A is slightly larger than B; so that the center of the connecting hole 21 is slightly misaligned with the center of the mounting hole 11, and the exemplary misalignment is A is 0.5 to 2 mm larger than B.

[0032] When using:

[0033] S1: Insert the liner 2 into the joint between the two rectangular tubes 1 so that the center of the connecting hole 21 is slightly misaligned with the center of the mounting hole 11;

[0034] S2: Two pin structural members 3 are respectively inserted through the two pairs of misaligned mounting holes 11 and connecting holes 21, thereby driving the two rectangular tubes 1 to come close together and connect into one piece; for example, the shaft diameter of the part of the pin structural member 3 that contacts the mounting hole 11 and connecting hole 21 is the same as the hole diameter of the mounting hole 11, so that the tightness is appropriate and the fixation is reliable; the end of the pin structural member 3 is provided with a chamfer to facilitate insertion into the misaligned mounting hole 11 and connecting hole 21.

[0035] The working principle is as follows: when the pin structure 3 is inserted into the misaligned mounting hole 11 and connecting hole 21, for example by hammering the pin structure 3 (e.g., a cylindrical pin) into the mounting hole 11 and connecting hole 21; since A is slightly larger than B; the elastic deformation of the rectangular tube 1 and the liner 2 itself causes the liner 2 to be in a pulled state, while the two rectangular tubes 1 are in a mutually compressive state, forcing the two rectangular tubes 1 to come close together and connect as one. This achieves the effect of reducing the seam and ensuring a tight connection. The liner 2 inserted inside the rectangular tube 1 provides support and sufficient strength for the seam. Furthermore, the pin structure 3 is obviously detachable, making the two connected rectangular tubes 1 detachable. During disassembly, the pin structure 3 can be pushed out of the mounting hole 11 and connecting hole 21 by hammering. More preferably, the length of the pin structure 3 is set to be slightly less than or equal to the thickness of the rectangular tube 1, so that neither the upper nor lower ends of the pin structure 3 exceed the outer wall of the rectangular tube 1. Thus, the connecting device is placed inside the rectangular tube 1 without increasing the outer contour of the rectangular tube 1, so as to facilitate its use as a track.

[0036] To further enhance the supporting force, the outer contour of the liner 2 is designed to correspond to the inner wall of the rectangular tube 1, so that when the liner 2 is inserted into the rectangular tube 1, all four inner walls of the rectangular tube 1 can be supported by the liner 2. In other words, the liner 2 cannot wobble inside the rectangular tube 1, and the load borne by the rectangular tube 1 in all directions can be transferred to the liner 2.

[0037] In a more preferred embodiment, A is set to be 1 mm larger than B; the tension force is moderate. The liner 2 is also made of aluminum alloy, which is easy to form and simple to manufacture.

[0038] More preferably, the pin structure 3 is made expandable, comprising an upper locking cone ring 31, a lower locking cone ring 32, an internal hex bolt 33, and two expansion semi-rings 34; the upper and lower ends of the expansion semi-rings 34 are provided with tapered hole surfaces 35, which are respectively used to cooperate with the tapered shaft surfaces 36 of the upper locking cone ring 31 and the lower locking cone ring 32; the upper locking cone ring 31 is provided with a through hole 37 in the center; the lower locking cone ring 32 is provided with a threaded hole 38 in the center; the end of the internal hex bolt 33 can pass through the through hole 37 and be screwed into the threaded hole 38.

[0039] The working principle of the expandable pin structure 3 is as follows: when the end of the hexagon socket head cap screw 33 passes through the through hole 37 and is screwed into the threaded hole 38, the upper locking cone ring 31 and the lower locking cone ring 32 are pulled together during the continuous screwing process. The tapered hole surface 35 and the tapered shaft surface 36 are engaged, forcing a pair of expansion half-rings 34 to expand radially until they are fully tightened. The usage method at this time is to first insert the pre-closed pair of expansion half-rings 34, along with the hexagon socket head cap screw 33, the upper locking cone ring 31, and the lower locking cone ring 32, as a whole into the mounting hole 11 and the connecting hole 21. Since radial expansion has not yet occurred, insertion is easy and does not require hammering, making operation convenient. After insertion, the hexagon socket head cap screw 33 is screwed on again, causing the pair of expansion half-rings 34 to expand, resulting in the liner 2 being in a pulled state while the two rectangular tubes 1 are in a mutually compressive state, forcing the two rectangular tubes 1 to come close together and connect as a whole. Similarly, when disassembly is required, the internal hex bolt 33 is unscrewed in the opposite direction to release the tension, and a pair of expansion half-rings 34 close together, which can be easily pulled out without knocking, thereby improving the convenience of disassembling and assembling the pin structure 3; and the expansion can be used to adjust the degree of closeness between the two rectangular tubes 1.

[0040] To further improve convenience, the pair of expansion semi-rings 34, together with the hexagon socket bolt 33 and the upper locking cone ring 31 and lower locking cone ring 32, are integrated into a single pin structure 3 for easy handling and to prevent them from falling apart. A groove 39 for fitting a rubber band is provided on the outer wall of the expansion semi-rings 34. After the rubber band is fitted, the radial direction of the pair of expansion semi-rings 34 is constrained, and in the axial direction, the upper locking cone ring 31 and lower locking cone ring 32, with their smaller ends facing each other, prevent the hexagon socket bolt 33 and the upper locking cone ring 31 and lower locking cone ring 32, as inner core components, from axially disengaging from the pair of expansion semi-rings 34. Furthermore, when the pair of expansion semi-rings 34 expand, the elastic rubber band does not hinder the expansion of the expansion semi-rings 34.

[0041] The advantages of this embodiment are:

[0042] (1) The joint between the two rectangular tubes 1 is tight enough to reduce the bumps when the wheels are moving.

[0043] (2) The joint of the two rectangular tubes 1 has high structural strength, which can provide sufficient support for the wheel;

[0044] (3) The connecting device does not protrude from the outer contour of the rectangular tube 1, but is embedded inside the rectangular tube 1, which makes it convenient to use as a track;

[0045] (4) The pin structure 3 can be quickly and easily disassembled and installed, and maintenance is convenient.

[0046] In summary, the two rectangular tubes 1 are tightly and securely joined, and the connecting device is located inside the rectangular tubes 1 without increasing the outer contour of the rectangular tubes 1, making it convenient to use as a track.

[0047] Example 2: (See reference) Figure 4 ;

[0048] This embodiment uses the same docking structure as Embodiment 1. The difference is that one end of the liner 2 is curved, so that one end of the liner 2 can be inserted into the curved rectangular tube (i.e., the rectangular bend 4), thereby allowing the method of Embodiment 1 to be applied to the curved track. In other words, the structure and method of Embodiment 1 can also be used to connect the rectangular bend 4, achieving the same technical effect as Embodiment 1.

[0049] The parts of this invention not described in detail are prior art; for those skilled in the art, the technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The scope of this invention is defined by the appended claims and their equivalents.

Claims

1. A quick-connect structure for rectangular tubes, comprising two rectangular tubes (1) with identical cross-sectional shapes; characterized in that: It also includes a liner (2) and a pin structure (3); A mounting hole (11) is provided on the side wall near the end face of the two rectangular tubes (1) that is close to the joint; the hole distance between the two mounting holes (11) after the end faces of the two rectangular tubes (1) are abutted together is set as A; The liner (2) is inserted into the joint between two rectangular tubes (1). Two connecting holes (21) of the same size as the mounting hole (11) are opened on the side wall of the liner (2). The hole distance between the two connecting holes (21) is set to B, and A is slightly larger than B, so that when the two rectangular tubes (1) are joined, the center of the connecting hole (21) and the mounting hole (11) are slightly misaligned. The two pin structural members (3) are inserted through the two pairs of misaligned mounting holes (11) and connecting holes (21) respectively, to drive the two rectangular tubes (1) to come close together and connect into one piece; The outer contour of the liner (2) corresponds to the inner wall of the rectangular tube (1), so that when the liner (2) is inserted into the rectangular tube (1), all four inner walls of the rectangular tube (1) can be supported by the liner (2); A is 0.5 mm to 2 mm larger than B.

2. The rectangular tube quick-connection structure according to claim 1, characterized in that: The length of the pin structure (3) is slightly less than or equal to the thickness of the rectangular tube (1), so that the upper and lower ends of the pin structure (3) do not extend beyond the outer wall of the rectangular tube (1).

3. The quick-connect structure for rectangular tubes according to claim 1, characterized in that: A is 1 mm larger than B.

4. The quick-connect structure for rectangular tubes according to claim 1, characterized in that: Both the rectangular tube (1) and the liner (2) are made of aluminum alloy.

5. The quick-connect structure for rectangular tubes according to claim 1, characterized in that: The pin structure (3) includes an upper locking cone ring (31), a lower locking cone ring (32), an internal hex bolt (33), and two expansion half rings (34); the upper and lower ends of the expansion half ring (34) are provided with tapered hole surfaces (35), which are respectively used to cooperate with the tapered shaft surfaces (36) of the upper locking cone ring (31) and the lower locking cone ring (32); the upper locking cone ring (31) is provided with a through hole (37) in the center; the lower locking cone ring (32) is provided with a threaded hole (38) in the center; the end of the internal hex bolt (33) passes through the through hole (37) and is screwed into the threaded hole (38).

6. The rectangular tube quick-connection structure according to claim 5, characterized in that: The outer wall of the expansion semi-ring (34) is provided with a groove (39) for fitting the rubber band.

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