Anti-cracking laminated veneer lumber

Abstract

The utility model relates to building material technical field discloses a kind of anti-cracking veneer laminated wood, including board mechanism, the inside of board mechanism is provided with multiple anti-cracking mechanism, multiple the anti-cracking mechanism all include limiting slot, the inside of board mechanism is provided with multiple limiting slot, the inside of multiple limiting slot is all fixedly connected with connecting assembly, the inside of board mechanism is provided with two protective layers, the inside of board mechanism is provided with two reference layers, the inside of board mechanism is provided with two support layers.In the utility model, to undertake the transverse shrinkage stress and tension of board, and pass through with support shaft and transmit transverse stress to support vertical plate, to realize the collaborative dispersion of longitudinal and transverse stress, further solve the problem that the cracking of traditional board is caused by single direction stress too large, further improve the anti-cracking capacity of board.

Description

Technical Field

[0001] This utility model relates to the field of building materials technology, and in particular to a crack-resistant laminated veneer lumber. Background Technology

[0002] With the surge in demand for timber in housing construction and other fields due to economic development, advancements in rotary cutting technology (which can cut small-diameter timber into uniform veneers), adhesive technology (which ensures bonding strength), and hot pressing equipment processes (which ensure product quality) have provided support for the development of laminated veneer lumber (LVL). LVL, with its stable mechanical properties, flexible and controllable dimensions, and efficient utilization of low-quality timber, is widely used in building structures, packaging and transportation, furniture and decoration, sports equipment, and agricultural outdoor facilities.

[0003] Laminated veneer lumber uses veneers rotary-cut from low-quality wood such as small-diameter timber as the basic unit. After drying to control the moisture content (8% to 12%) and removing defects, the veneers are laminated according to the principle of "primarily parallel grain and secondarily cross grain (total thickness ≤ 20%)". The veneers are then coated with suitable adhesives (phenolic resin for structural types and urea-formaldehyde resin for non-structural types) and then subjected to precise hot pressing (120 to 150℃, 0.8 to 1.2 MPa) to fully cure the adhesive layers, thus bonding the multiple veneers into a whole. The final product relies on the fiber structure of "co-directional lamination".

[0004] In existing technologies, some laminated veneer lumber (LVL) exhibits cracking during use due to its predominantly longitudinal lamination structure and weak transverse properties. This leads to stress concentration in a single direction under load, affecting structural stability and service life. To address this issue, a crack-resistant LVL is proposed. Utility Model Content

[0005] To overcome the above deficiencies, this utility model provides a crack-resistant laminated veneer material, which aims to improve the problem that some laminated veneer materials in the prior art crack during use due to stress concentration caused by the predominance of longitudinal grain and weak transverse properties, thus affecting structural stability and lifespan.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A crack-resistant laminated veneer material includes a sheet material structure, wherein multiple crack-resistant mechanisms are provided inside the sheet material structure, each of the multiple crack-resistant mechanisms includes a limiting groove, and multiple limiting grooves are opened inside the sheet material structure, and connecting components are fixedly connected inside the multiple limiting grooves.

[0008] As a further description of the above technical solution:

[0009] The plate mechanism has two protective layers inside, two reference layers inside, and two support layers inside;

[0010] As a further description of the above technical solution:

[0011] Each of the multiple connecting components includes a supporting longitudinal plate, the external of the multiple supporting longitudinal plates is fixedly connected to the interior of the plate mechanism, the interior of each of the multiple supporting longitudinal plates is fixedly connected to a supporting shaft, and the external of each of the multiple supporting shafts is fixedly connected to a supporting transverse plate.

[0012] As a further description of the above technical solution:

[0013] The upper and lower ends of the plurality of support shafts are respectively fixedly connected to the upper and lower ends of the plate mechanism, and the outer sides of the plurality of support cross plates are fixedly connected to the inside of the plate mechanism.

[0014] As a further description of the above technical solution:

[0015] The adjacent ends of the two protective layers are respectively fixedly connected to the distant ends of the two reference layers, and the adjacent ends of the two reference layers are respectively fixedly connected to the upper and lower ends of the support layer.

[0016] As a further description of the above technical solution:

[0017] The exterior of the plurality of supporting longitudinal plates is fixedly connected to the interior of the plurality of limiting grooves, and the exterior of the plurality of supporting transverse plates is fixedly connected to the interior of the plurality of limiting grooves.

[0018] This utility model has the following beneficial effects:

[0019] 1. In this utility model, the fiber direction of the supporting longitudinal plate is consistent with the longitudinal direction of the board, thereby bearing the longitudinal tensile force and bending stress of the board. The internal metal support shaft further restricts the excessive deformation of the supporting longitudinal plate, avoiding longitudinal stress concentration that could cause the board to crack. The supporting transverse plate is tightly connected to the board structure with adhesive, thereby bearing the transverse shrinkage stress and tensile force of the board. It also transmits the transverse stress to the supporting longitudinal plate through the support shaft, thereby achieving synergistic dispersion of longitudinal and transverse stress. This solves the problem of cracking caused by excessive stress in a single direction in traditional boards, and further improves the crack resistance of the board.

[0020] 2. In this utility model, the protective layer not only prevents external moisture from penetrating into the board, but also enhances the scratch and wear resistance of the board surface through its own hardness characteristics. The reference layer reduces the overall deformation of the board, and the support layer enhances the overall crack resistance of the board. Furthermore, high-strength adhesives or structural adhesives are used to improve the connection strength between the protective layer, the reference layer, the support layer and the crack prevention mechanism, forming a multi-layer protection, thereby improving the environmental adaptability and service life of the board. Attached Figure Description

[0021] Figure 1 This is a three-dimensional schematic diagram of a crack-resistant laminated veneer material proposed in this utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the protective layer of a crack-resistant laminated veneer material proposed in this utility model;

[0023] Figure 3 This is a schematic diagram of the limiting groove structure of a crack-resistant laminated veneer material proposed in this utility model;

[0024] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0025] Legend:

[0026] 1. Sheet metal structure; 11. Protective layer; 12. Base layer; 13. Support layer; 2. Crack prevention mechanism; 21. Connecting components; 211. Supporting longitudinal plate; 212. Supporting shaft; 213. Supporting transverse plate; 22. Limiting groove. Detailed Implementation

[0027] 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.

[0028] Reference Figures 1 to 3This utility model provides an embodiment of a crack-resistant laminated veneer lumber, comprising a sheet structure 1. The sheet structure 1 serves as the main frame of the overall structure and possesses the basic properties of traditional laminated veneer lumber, such as high strength and high stability. Multiple crack-resistant mechanisms 2 are uniformly distributed along the longitudinal and transverse directions within the sheet structure 1. When the sheet structure 1 is subjected to external impact or stress generated by thermal expansion and contraction, the multiple crack-resistant mechanisms 2 disperse the stress, preventing stress concentration that could lead to cracks in the sheet. Each crack-resistant mechanism 2 includes a limiting groove 22. Multiple limiting grooves 22 are formed inside the sheet structure 1 and are densely distributed along stress concentration areas, such as the ends and middle stress points of the sheet. The groove walls are smooth and provide guiding support. Each of the multiple limiting grooves 22 has a connecting component 21 fixedly connected inside. Each of the multiple connecting components 21 includes a supporting longitudinal plate 211. The shape of the multiple supporting longitudinal plates 211 is adapted to the internal shape of the multiple limiting grooves 22. The multiple supporting longitudinal plates 211 are fixedly connected to the inner wall of the multiple limiting grooves 22 by a high-strength adhesive, thereby improving the smoothness of the stress transmission path.

[0029] Multiple supporting longitudinal plates 211 are externally fixedly connected to the interior of the plate structure 1. These plates are made of composite fiberboard, with their fiber direction aligned with the longitudinal direction of the plate structure 1, enhancing the plate's longitudinal bending and tensile strength. The supporting longitudinal plates 211 are externally fixedly connected to the interior of multiple limiting grooves 22. These grooves provide longitudinal support to the supporting longitudinal plates 211, preventing lateral bending or displacement, thereby improving the density of the plate's internal structure and enhancing its crack resistance. Each supporting longitudinal plate 211 is internally fixedly connected to a supporting shaft 212 made of metal. When the supporting longitudinal plates 211 are subjected to longitudinal stress, the supporting shafts 212, through their rigidity, limit the deformation of the supporting longitudinal plates 211, thereby enhancing their longitudinal load-bearing capacity and deformation resistance. The upper and lower ends of multiple support shafts 212 are respectively fixedly connected to the upper and lower ends of the plate mechanism 1 by welding. When the surface of the plate mechanism 1 is subjected to external force impact, the support shafts 212 are used to transmit the stress on the upper and lower ends, reducing the bending deformation of the plate when subjected to force in the vertical direction.

[0030] Multiple support shafts 212 are externally fixedly connected to support cross plates 213. The cross plates 213 transfer lateral stress to the support shafts 212, which then transfer it to the support longitudinal plates 211 and the entire plate structure 1. This achieves coordinated dispersion of lateral and longitudinal stress, preventing cracking of the plate due to excessive stress in one direction. The multiple support cross plates 213 are externally fixedly connected to the interior of the plate structure 1. The cross plates 213 are connected to the plate structure 1 via adhesive. The plate structure 1 bears and disperses lateral tensile or contractile stress, thereby improving its crack resistance. The multiple support cross plates 213 are externally fixedly connected to the interior of multiple limiting grooves 22. These grooves provide limiting and guiding functions for the support cross plates 213, preventing bending or displacement in the vertical direction and improving their support effect against lateral stress.

[0031] Reference Figure 1 , Figure 3 and Figure 4 The board structure 1 has two protective layers 11 inside, symmetrically distributed on the outermost layer. These layers are made of wear-resistant resin material and isolate the board from external environmental factors, preventing moisture from directly penetrating the interior. They also enhance the wear resistance and scratch resistance of the board surface, extending its service life. The board structure 1 also has two reference layers 12 inside. The adjacent ends of the two protective layers 11 are fixedly connected to the distant ends of the two reference layers 12, providing stable support for the protective layers 11. These reference layers are made of multiple layers of solid wood veneer, with the fiber directions of each veneer perpendicular to each other, and are bonded together with adhesives under high temperature and pressure to reduce overall board deformation. The board structure 1 has two support layers 13 inside. The two reference layers 12 are fixedly connected to the upper and lower ends of the support layer 13 at their respective adjacent ends. The two reference layers 12 are connected to the upper and lower ends of the support layer 13 by high-strength structural adhesive. At the same time, the shape of the reference layers 12 restricts the shrinkage or expansion of the support layer 13, thereby reducing the deformation of the support layer 13 due to environmental changes and improving the overall crack resistance of the board.

[0032] Working principle: The two outermost protective layers 11 isolate the material from external moisture, friction, scratches, and other factors, preventing moisture from seeping into the board and causing mold or swelling. Simultaneously, their wear-resistant properties protect the board surface, extending its lifespan. The base layer 12 provides stable support for the protective layers 11. Furthermore, thanks to its multi-layered, cross-laminated solid wood veneer structure (each layer has perpendicular fiber direction and is formed under high temperature and pressure), the base layer 12 buffers and disperses the impact when the protective layers 11 are subjected to external force, preventing the impact from being directly transmitted to the interior. The support layer 13 located between the reference layers 12 is connected to the upper and lower reference layers 12 by high-strength structural adhesive. The reference layer 12 uses its own stable structure to limit the shrinkage or expansion of the support layer 13, reducing the deformation of the support layer 13 caused by changes in ambient temperature and humidity. At the same time, as the core support part of the plate structure 1, the support layer 13 works in conjunction with the crack prevention mechanism 2. When the crack prevention mechanism 2 disperses stress, the support layer 13 provides it with a stable installation foundation and structural support, ensuring that the crack prevention mechanism 2 and the multi-layer protective structure work together to improve the crack resistance and overall stability of the plate structure 1.

[0033] When the sheet metal structure 1 is subjected to external impact, longitudinal tension, transverse contraction, or internal stress due to thermal expansion and contraction, the longitudinal support plate 211, made of composite fiberboard with fibers aligned with the longitudinal direction of the sheet, quickly absorbs the longitudinal stress. The internally fixed metal support shaft 212, with its own rigidity, limits excessive deformation of the longitudinal support plate 211, thereby improving its longitudinal load-bearing capacity and resistance to deformation. Simultaneously, the longitudinal stress is transferred to the entire sheet metal structure 1 via a high-strength adhesive. The transverse support plate 213 is connected to the sheet metal structure 1 via adhesive, providing high strength and stability. It effectively bears the lateral tensile or contractile stress, and then, through the fixed connection with the support shaft 212, it transmits the lateral stress to the support shaft 212, and then to the support longitudinal plate 211 and the plate mechanism 1, thereby achieving the coordinated dispersion of longitudinal and lateral stress and avoiding stress concentration in one direction that could cause cracks in the plate mechanism 1. In this process, the limiting groove 22 restricts the lateral displacement of the support longitudinal plate 211 and the vertical displacement of the support transverse plate 213, respectively, ensuring that the connecting component 21 always maintains a stable stress transmission path, thereby exerting the crack-resistant effect of the crack-resistant mechanism 2.

[0034] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present 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 the present utility model should be included within the protection scope of the present utility model.

Claims

1. A crack-resistant laminated veneer lumber, comprising a sheet structure (1), characterized in that: The plate mechanism (1) is internally equipped with multiple anti-crack mechanisms (2); Each of the multiple anti-crack mechanisms (2) includes a limiting groove (22), and the plate mechanism (1) has multiple limiting grooves (22) inside, and each of the multiple limiting grooves (22) has a connecting component (21) fixedly connected inside.

2. The crack-resistant laminated veneer lumber according to claim 1, characterized in that: The plate mechanism (1) has two protective layers (11) inside, two reference layers (12) inside, and two support layers (13) inside.

3. The crack-resistant laminated veneer lumber according to claim 1, characterized in that: Each of the multiple connecting components (21) includes a supporting longitudinal plate (211), the external of the multiple supporting longitudinal plates (211) is fixedly connected to the inside of the plate mechanism (1), the internal of each of the multiple supporting longitudinal plates (211) is fixedly connected to a supporting shaft (212), and the external of each of the multiple supporting shafts (212) is fixedly connected to a supporting transverse plate (213).

4. The crack-resistant laminated veneer lumber according to claim 3, characterized in that: The upper and lower ends of the plurality of support shafts (212) are respectively fixedly connected to the upper and lower ends of the plate mechanism (1), and the outer sides of the plurality of support cross plates (213) are fixedly connected to the interior of the plate mechanism (1).

5. The crack-resistant laminated veneer lumber according to claim 2, characterized in that: The adjacent ends of the two protective layers (11) are respectively fixedly connected to the distant ends of the two reference layers (12), and the adjacent ends of the two reference layers (12) are respectively fixedly connected to the upper and lower ends of the support layer (13).

6. The crack-resistant laminated veneer lumber according to claim 3, characterized in that: The exterior of the plurality of supporting longitudinal plates (211) is fixedly connected to the interior of the plurality of limiting grooves (22), and the exterior of the plurality of supporting transverse plates (213) is fixedly connected to the interior of the plurality of limiting grooves (22).

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