A concave square tube and fixing structure thereof

Abstract

The utility model relates to the field of packing and transportation especially relates to a concave square tube, including square tube main part, square tube main part is hollow strip -shaped, still include: recess part, recess part sets up on square tube main part, recess part is located square tube main part one side vertical surface, recess part is along square tube main part vertical direction and penetrates top and bottom, recess part is the groove type structure that recesses outward, to square tube main part recess, recess part cross section gradually narrow from outside to inside, with square tube main part is connected, recess part effectively disperses stress, strengthens square tube main body longitudinal compressive strength and lateral bending strength, structure is more durable, a square tube fixing structure, including square tube main part, recess part as claim - any one, still include: fixing piece, the fixing piece is used to square tube main part clamping fixed, and the connection strength is enhanced, guarantees square tube main body to maximize play its longitudinal compressive strength in the use process, and the overall structure is simple and easy to dismount.

Description

Technical Field

[0001] This utility model relates to the field of packaging and transportation, and in particular to a concave square tube and its fixing structure. Background Technology

[0002] In the packaging industry, square tubes are commonly referred to as paper square tubes, also known as paper corner protectors or paper corner shields. They are hollow tubular packaging materials with square or rectangular cross-sections, made from multiple layers of high-strength kraft paper or corrugated paper bonded together with environmentally friendly adhesives using spiral winding or lamination processes. These square tubes are lightweight, high-strength, low-cost, recyclable, and environmentally friendly, making them widely used in product packaging and logistics transportation. The main purpose of paper square tubes is to protect the edges and corners of products during transportation and storage, preventing damage from collisions, compression, or drops. They can be used in conjunction with cartons, pallets, and other packaging materials to enhance the stability and pressure resistance of the overall packaging structure, making them particularly suitable for fragile, valuable, or angular products. Furthermore, paper square tubes can replace traditional wooden or plastic corner protectors, reducing environmental impact and aligning with the modern trend of green packaging. These products are widely used in various industries, and due to their customizable sizes, thicknesses, and lengths to meet customer needs, they have become an indispensable auxiliary material in industrial packaging.

[0003] Existing square tubes have regular rectangular or square cross sections with small moments of inertia. They are particularly prone to buckling or deformation under longitudinal compression or lateral bending, which affects the overall packaging protection. Due to the lack of reinforcement design in the tube structure, the load-bearing capacity is limited, making it difficult to meet the requirements of heavy-duty or high-protection packaging. During stacking, compression, or transportation, square tubes are prone to paper layer cracking, delamination, or even structural failure, affecting the overall packaging use. Under the same material conditions, there is limited room for improvement in the compressive strength of existing square tubes.

[0004] Secondly, the existing square tube fixing structure needs to be fixed to the carton by wrapping with tape, gluing, or simple buckles. The connection strength is low, and it is easy to loosen or fall off under transportation vibration or external impact. As a result, the square tube cannot effectively play its maximum protective role. In addition, it is difficult to disassemble and assemble during use, which is not conducive to the needs of recycling or rapid assembly in export packaging, and the use cost is high. Utility Model Content

[0005] This application provides a concave square tube and its fixing structure, adopting the following technical solution: A concave square tube includes a square tube body, which is a hollow elongated strip, and a recessed portion. The recessed portion is disposed on the square tube body and located on one side of the square tube body. The recessed portion extends vertically through the top and bottom of the square tube body. The recessed portion is a groove-shaped structure with its opening facing outward and recessed into the square tube body. The cross-section of the recessed portion gradually narrows from the outside to the inside and is connected to the square tube body.

[0006] Preferably, the cross-section of the recess is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward toward the interior of the square tube body.

[0007] Preferably, the horizontal bottom surface of the recess is parallel to the extension direction of the edge of the square tube body at the location where the recess is located.

[0008] Preferably, the outer surface corners and inner cavity corners of the square tube body are provided with rounded transitions.

[0009] A square tube fixing structure includes a square tube body, a recessed portion, and a fixing member for clamping and fixing the square tube body.

[0010] Preferably, the fastener is a tubular structure, comprising two opposing sidewalls and a bottom wall connecting the sidewalls, forming a downward-facing receiving groove.

[0011] Preferably, the fastener is hollow U-shaped.

[0012] Preferably, the width and depth of the fixing groove are adapted to simultaneously accommodate one side of the square tube body and an object to be fixed, so as to achieve relative clamping and fixing of the square tube body and the object to be fixed by a plug-in method.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This concave square tube forms an inverted trapezoidal structure with an open opening by setting a recess on the main body of the square tube. The recess increases the perimeter of the cross-section of the main body of the square tube. The horizontal bottom surface of the recess is parallel to the edge of the square tube, ensuring uniform stress distribution and effectively dispersing stress. This significantly enhances the longitudinal compressive strength and transverse bending strength of the main body of the square tube. Furthermore, the corners of the inner and outer edges of the entire square tube are rounded, effectively reducing the risk of cracking of the main body of the square tube under pressure and improving the structural durability.

[0014] 2. This square tube fixing structure uses a hollow U-shaped fastener, one end of which is inserted into the cavity of the square tube, and the other end is inserted into other objects to form a clamping constraint, thereby fixing the main body of the square tube and further enhancing the connection strength. This ensures that the main body of the square tube can maximize its longitudinal compressive strength during use, greatly enhancing the compressive strength of the overall structure. In addition, the structure of the square tube main body and the fastener is simple, making it more convenient to disassemble, assemble, and transport, and reducing the cost of use. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be discussed below. Obviously, the technical solutions described in conjunction with the accompanying drawings are only some embodiments of this utility model. For those skilled in the art, other embodiments and their accompanying drawings can be obtained from the embodiments shown in these drawings without creative effort.

[0016] Figure 1 This is a structural schematic diagram of the square tube body of this utility model.

[0017] Figure 2 This is a cross-sectional view of the square tube body of this utility model.

[0018] Figure 3 This is a structural schematic diagram of Embodiment 2 of this utility model.

[0019] Figure 4 This is an exploded view of Embodiment 2 of this utility model.

[0020] Figure 5 This is a structural schematic diagram of Embodiment 3 of this utility model.

[0021] Figure 6 This is a rear view of Embodiment 3 of this utility model.

[0022] Figure 7 This is an exploded view of Embodiment 3 of this utility model.

[0023] Figure 8 This is a schematic diagram of the structure of a square tube in existing technology.

[0024] Figure 9 This is a pressure resistance test curve of the concave square tube of this utility model and the existing square tube.

[0025] Reference numerals: 1. Square tube body; 101. Recessed part; 2. Fastener; 3. Fixture. Detailed Implementation

[0026] The technical solutions of various embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] An embodiment of this utility model provides a concave square tube and its fixing structure.

[0030] Example 1: As Figure 1-2As shown: A concave square tube includes a square tube body 1, which is a hollow elongated strip, and a recessed portion 101. The recessed portion 101 is disposed on the square tube body 1 and located on one side of the square tube body 1. The recessed portion 101 extends vertically through the top and bottom of the square tube body 1. The recessed portion 101 is a groove-shaped structure with an outward opening and recessed into the square tube body 1. The cross-section of the recessed portion 101 gradually narrows from the outside to the inside and connects with the square tube body 1. The recessed portion 101 increases the perimeter of the cross-section of the square tube body 1. The horizontal bottom surface of the recessed portion 101 is parallel to the edge of the square tube body 1, ensuring uniform stress distribution, effectively dispersing stress, and significantly enhancing the longitudinal compressive strength and transverse bending strength of the square tube body 1. The cross-section of the recessed portion 101 is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward into the square tube body 1. The horizontal bottom surface of the recess 101 is parallel to the edge extension direction of the square tube body 1 at the location where the recess 101 is located. The outer surface corners and inner cavity corners of the square tube body 1 are provided with rounded transitions, which effectively reduces the risk of cracking of the square tube body during pressure and improves structural durability.

[0031] like Figure 8-9 As shown, in the whole-box compression test, the compression performance of the existing ordinary square tube structure and the concave square tube structure of this utility model were compared using the same test conditions and materials. The test results show that the existing square tube structure achieved a maximum compressive strength of 4680N, corresponding to a deformation of 4.57mm; while the concave square tube of this utility model, under the same conditions and materials, achieved a maximum compressive strength of 7782N, corresponding to a deformation of only 3.03mm.

[0032] Therefore, compared with the prior art, the concave square tube of this invention has significantly improved compressive strength and transverse bending strength. This indicates that the concave square tube of this invention not only has significantly higher compressive load-bearing capacity, but also stronger structural rigidity and better resistance to deformation.

[0033] A concave square tube fixing structure includes a square tube body 1, which is a hollow elongated strip, and a recessed portion 101. The recessed portion 101 is disposed on the square tube body 1 and located on one side of the square tube body 1. The recessed portion 101 extends vertically through the top and bottom of the square tube body 1. The recessed portion 101 is a groove-shaped structure with an outward opening and recessed into the square tube body 1. The cross-section of the recessed portion 101 gradually narrows from the outside to the inside and connects with the square tube body 1. The recessed portion 101 increases the perimeter of the cross-section of the square tube body 1. The horizontal bottom surface of the recessed portion 101 is parallel to the edge of the square tube body 1, ensuring uniform stress distribution, effectively dispersing stress, and significantly enhancing the longitudinal compressive strength and transverse bending strength of the square tube body 1. The cross-section of the recessed portion 101 is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward into the square tube body 1. The horizontal bottom surface of the recess 101 is parallel to the edge extension direction of the square tube body 1 at the location where the recess 101 is located. The outer surface corners and inner cavity corners of the square tube body 1 are provided with rounded transitions, which effectively reduces the risk of cracking of the square tube body during pressure and improves structural durability.

[0034] By placing the square tube body 1 in conjunction with packaging materials such as cartons and pallets, the overall strength of the packaging materials is increased, effectively improving the compressive strength of the packaging materials, significantly enhancing the bending resistance of the packaging materials, and making the structure more rigid.

[0035] Example 2: As Figure 3-4 As shown, a concave square tube fixing structure includes a square tube body 1, which is a hollow elongated strip, and a recessed portion 101. The recessed portion 101 is disposed on the square tube body 1 and located on one side of the square tube body 1. The recessed portion 101 extends vertically through the top and bottom of the square tube body 1. The recessed portion 101 is a groove-shaped structure with an outward opening and recessed into the square tube body 1. The cross-section of the recessed portion 101 gradually narrows from the outside to the inside and connects with the square tube body 1. The recessed portion 101 increases the perimeter of the cross-section of the square tube body 1. The horizontal bottom surface of the recessed portion 101 is parallel to the edge of the square tube body 1, ensuring uniform stress distribution, effectively dispersing stress, and significantly enhancing the longitudinal compressive strength and transverse bending strength of the square tube body 1. The cross-section of the recessed portion 101 is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward into the square tube body 1. The horizontal bottom surface of the recess 101 is parallel to the edge extension direction of the square tube body 1 at the location where the recess 101 is located. The outer surface corners and inner cavity corners of the square tube body 1 are provided with rounded transitions, which effectively reduces the risk of cracking of the square tube body during pressure and improves structural durability.

[0036] It also includes a fixing component 2 and a fixing object 3. The fixing component 2 is a single piece, used to clamp and fix the square tube body 1. The fixing component 2 is a tubular structure, including two oppositely arranged side walls and a bottom wall connecting the side walls, forming a downward-facing receiving groove. The fixing component 2 is hollow U-shaped. The width and depth of the receiving groove of the fixing component 2 are adapted to simultaneously accommodate one side of the square tube body 1 and the fixing object 3, so as to realize the relative clamping and fixing of the square tube body 1 and the fixing object 3 by insertion. The fixing object 3 can be a plate, box, side panel, pallet, etc., and is not specifically limited thereto.

[0037] The square tube body 1 is placed on the side of the fixing object 3, with the recessed part 101 facing away from the fixing object 3. The square tube body 1 is tightly attached to the fixing object 3. The fixing member 2 is inserted into the interior of the square tube body 1 from the top. One side wall of the fixing member 2 is inserted into the inner cavity of the square tube body 1, and the other side wall of the fixing member 2 is tightly attached to the outer side wall of the fixing object 3. The fixing object 3 and one side of the square tube body 1 are located in the receiving groove of the fixing member 2. The fixing member 2 clamps and fixes the square tube body 1 and the fixing object 3, further enhancing the connection strength of the fixing structure, ensuring that the square tube body 1 can maximize its longitudinal compressive strength during use, and greatly enhancing the compressive strength of the overall structure.

[0038] Example 3: As Figure 5-7 As shown, a concave square tube fixing structure includes a square tube body 1, which is a hollow elongated strip, and a recessed portion 101. The recessed portion 101 is disposed on the square tube body 1 and located on one side of the square tube body 1. The recessed portion 101 extends vertically through the top and bottom of the square tube body 1. The recessed portion 101 is a groove-shaped structure with an outward opening and recessed into the square tube body 1. The cross-section of the recessed portion 101 gradually narrows from the outside to the inside and connects with the square tube body 1. The recessed portion 101 increases the perimeter of the cross-section of the square tube body 1. The horizontal bottom surface of the recessed portion 101 is parallel to the edge of the square tube body 1, ensuring uniform stress distribution, effectively dispersing stress, and significantly enhancing the longitudinal compressive strength and transverse bending strength of the square tube body 1. The cross-section of the recessed portion 101 is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward into the square tube body 1. The horizontal bottom surface of the recess 101 is parallel to the edge extension direction of the square tube body 1 at the location where the recess 101 is located. The outer surface corners and inner cavity corners of the square tube body 1 are provided with rounded transitions, which effectively reduces the risk of cracking of the square tube body during pressure and improves structural durability.

[0039] It also includes two fasteners 2 and two fixing objects 3. The fasteners 2 are located at both ends of the opening of the square tube body 1, and are used to clamp and fix the square tube body 1. The fasteners 2 clamp and fix both ends of the square tube body 1, effectively preventing the square tube body 1 from tilting or misaligning due to external forces during use after installation, and effectively improving the stability of the overall fixing structure. The fasteners 2 are tubular structures, including two oppositely arranged side walls and a bottom wall connecting the side walls, forming a downward-facing receiving groove. The fasteners 2 are hollow U-shaped. The width and depth of the receiving groove of the fasteners 2 are adapted to simultaneously accommodate one side of the square tube body 1 and the fixing object 3, so as to realize the relative clamping and fixing of the square tube body 1 and the fixing object 3 by insertion. The fixing object 3 can be a plate, box, side panel, pallet, etc., and is not specifically limited thereto.

[0040] The square tube body 1 is placed on the side of the fixing object 3, with the recessed portion 101 facing away from the fixing object 3. The square tube body 1 is tightly attached to the fixing object 3. Fixing members 2 are inserted into the square tube body 1 from the top and bottom respectively. One side wall of the fixing member 2 is inserted into the inner cavity of the square tube body 1, and the other side wall of the fixing member 2 is tightly attached to the outer wall of the fixing object 3. This ensures that one side of the fixing object 3 and the square tube body 1 is located within the receiving groove of the fixing member 2. The fixing member 2 clamps and fixes the square tube body 1 and the fixing object 3, further enhancing the connection strength of the fixing structure. This ensures that the square tube body 1 can maximize its longitudinal compressive strength during use, significantly enhancing the overall compressive strength of the structure. Using two fixing members 2 greatly improves the overall stability of the concave square tube fixing structure, effectively avoiding the influence of external forces on the square tube body 1, and making it more versatile.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and not restrictive in all respects. The scope of this invention is defined by the appended claims, not by the foregoing description, and is therefore intended to encompass all variations falling within the meaning and scope of equivalents of the claims. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A concave square tube, comprising a square tube body (1), wherein the square tube body (1) is a hollow elongated strip. Its features are: Also includes: A recessed portion (101) is provided on the square tube body (1). The recessed portion (101) is located on one side of the vertical surface of the square tube body (1). The recessed portion (101) extends through the top and bottom of the square tube body (1) in a vertical direction. The recessed portion (101) is a groove-shaped structure with an opening facing outward and recessed into the square tube body (1). The cross-section of the recessed portion (101) gradually narrows from the outside to the inside and is connected to the square tube body (1).

2. The concave square tube according to claim 1, characterized in that: The cross-section of the recess (101) is an inverted trapezoid, including a horizontal bottom surface and two inclined surfaces that slope inward toward the inside of the square tube body (1).

3. A concave square tube according to claim 2, characterized in that: The horizontal bottom surface of the recess (101) is parallel to the edge extension direction of the square tube body (1) at the location where the recess (101) is set.

4. A concave square tube according to claim 1, characterized in that: The outer surface corners and inner cavity corners of the square tube body (1) are provided with rounded transitions.

5. A square tube fixing structure, characterized in that: Including the square tube body (1) and the recessed portion (101) as described in any one of claims 1-4, it further includes: Fixing component (2) is used to clamp and fix the square tube body (1).

6. The square tube fixing structure according to claim 5, characterized in that: The fastener (2) is a tubular structure, and the fastener (2) includes two opposing sidewalls and a bottom wall connecting the sidewalls to form a receiving groove with the opening facing downward.

7. A square tube fixing structure according to claim 6, characterized in that: The fastener (2) is hollow U-shaped.

8. A square tube fixing structure according to claim 7, characterized in that: The width and depth of the receiving groove of the fixing member (2) are adapted to simultaneously accommodate one side of the square tube body (1) and the object to be fixed, so as to realize the relative clamping and fixing of the square tube body (1) and the object to be fixed by the insertion method.

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