Core plate curtain structure, three-layer solid wood floor, core plate curtain manufacturing method and manufacturing device

Abstract

The invention provides a core plate curtain structure, a three-layer solid wood floor and a core plate curtain manufacturing method and device, relates to the technical field of wood floors, and solves the technical problems that a three-layer solid wood floor is prone to moisture absorption and expansion, deformation is caused, and the plate surface wave mark defect is generated. The core plate curtain structure comprises core plate strips, connecting pieces and rubber columns, the connecting pieces penetrate through all the core plate strips, and all the core plate strips are connected in series to form a core plate curtain; the rubber columns are fixed to the side portions of the core plate strips, and the rubber columns are located between the two adjacent core plate strips and used for keeping a fixed gap between the two adjacent core plate strips. The core plate curtain is formed by connecting the core plate strips in series through the connecting pieces, fixed gaps are reserved between the wood plates through the rubber columns, the adjacent core plate strips are prevented from being tightly attached, and stress deformation generated by expansion of the core plate strips is reduced or even eliminated. Due to the free wet expansion and dry shrinkage performance of the core plate curtain, normal use of the floor in various environments can be guaranteed, and the defect that a three-layer floor generally has plate surface wave marks is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of wooden floors, and particularly to a core board curtain structure, a three-layer solid wood floor, a method for preparing a core board curtain, and a preparation device. Background Art

[0002] See Figure 1 As shown, the three-layer solid wood floor in the prior art includes a surface board, a core board, and a back board, wherein: the core board is located between the surface board and the back board. See Figure 2 As shown, the core board includes a plurality of core board strips, and all the core board strips are closely attached side by side. The core board is usually formed by connecting board strips such as pine, fir, and poplar in series.

[0003] Wooden boards are all water-absorbent. In the prior art, due to the close connection of the core board strips, when the equilibrium moisture content of the environment where the three-layer floor is used is higher than the moisture content of the board strips, the board strips expand. The expansion is restricted by the surface board and the back board and cannot expand freely. The compressive stress generated by the combination of several board strips causes the floor to produce wavy deformation, commonly known as "rib marks" and "rib scars". When the thickness of the surface board is less than 4.0 mm, the wave mark phenomenon on the board surface is more serious.

[0004] In the prior art, in order to solve the above problems, one means is to rely on the irregular bending of the core board strips themselves to generate random gaps. However, these gaps are not fixed. In a humid environment, these gaps will gradually decrease. When the gaps are too small, it will cause local rib marks on the floor. When the gaps are too large and the surface board is relatively thin, obvious marks can be seen on the floor surface.

[0005] Another means is to insert wood chips between the core strips to make the core strips generate uniform gaps. However, the wood chips and the core strips are still closely connected, and the wood chips also absorb water, which does not essentially eliminate the cause of floor wave marks. Therefore, it can be called a "false equal-gap core board".

[0006] The applicant of the present invention has found that the prior art has at least the following technical problems: In the prior art, the three-layer solid wood floor cannot be suitable for both high-temperature and dry environments and humid environments at the same time. When the floor process matches the high-temperature and dry environment (the usage environment in the north), it is extremely easy to have the problem of rib marks in the humid environment (the usage environment in the south). When the floor process matches the humid environment, it is extremely easy to produce rib marks caused by surface board cracking and core strip shrinkage in the high-temperature and dry areas. The prior art cannot solve the deformation of the solid wood floor caused by water absorption and expansion, and the wave mark defect on the board surface of the solid wood floor has always troubled researchers. Summary of the Invention

[0007] The object of the present invention is to provide a core board curtain structure, a three-layer solid wood floor, a method for preparing a core board curtain and a preparation device, so as to solve the technical problems existing in the prior art that the solid wood floor is prone to absorb water and expand, resulting in deformation and surface wave mark defects. The preferred technical solutions among the many technical solutions provided by the present invention can produce many technical effects, which will be elaborated in detail below.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A core board curtain structure provided by the present invention includes core board strips, connecting members and glue columns, wherein:

[0010] The connecting member passes through all the core board strips, and all the core board strips are connected in series to form a core board curtain;

[0011] The glue columns are fixed on the side parts of the core board strips, and the glue columns are located between two adjacent core board strips, and are used to keep a fixed gap between two adjacent core board strips.

[0012] Preferably, the connecting member includes a connecting rope, and a rope groove is provided on the core board strip, and all the rope grooves through which the same connecting rope passes are located on the same straight line, and the connecting rope passes through the rope grooves to connect all the core board strips in series.

[0013] Preferably, the number of the connecting members is at least two, and the two connecting members respectively pass through the opposite ends of the core board strip;

[0014] On the same core board strip, the number of the glue columns is at least two, and the glue columns are arranged at intervals along the length direction of the corresponding core board strip.

[0015] Preferably, the glue column is in a cylindrical structure, the height of the glue column is not greater than the thickness of the core board strip, and the glue column does not protrude from the surface of the core board strip.

[0016] Preferably, the diameter of the glue column is 0.5 mm - 1 mm, so that the fixed gap between two adjacent core board strips is between 0.5 mm - 1 mm;

[0017] All the fixed gaps on the core board curtain are equal.

[0018] Preferably, the glue column includes the following raw materials in parts by weight: 45 - 55 parts of ethylene-vinyl acetate, 20 - 30 parts of resin, 5 - 15 parts of paraffin, and 10 - 20 parts of rosin.

[0019] The present invention also provides a three-layer solid wood floor, which includes a surface board, a back board and the above core board curtain structure, the surface board is fixed on the upper surface of the core board curtain, and the back board is fixed on the lower surface of the core board curtain.

[0020] Preferably, the moisture content of the surface board, the back board and the core board curtain is between 5% and 15%.

[0021] The present invention also provides a method for preparing a core board curtain for preparing the above-mentioned core board curtain structure, and the method includes:

[0022] Drying the board: making the moisture content of the board uniformly balanced at 9%-10%;

[0023] Cutting and polishing the board;

[0024] Adhering the glue columns on the board, dividing the board adhered with the glue columns into pieces, and cutting out the core board strips fixed with the glue columns; or, dividing the board into pieces, cutting the board into core board strips, and adhering the glue columns on the core board strips;

[0025] Stringing the curtain: passing the connecting piece through all the core board strips and connecting all the core board strips into the core board curtain.

[0026] The present invention also provides a device for preparing a core board curtain for manufacturing the above-mentioned core board curtain structure, and the device includes a frame, a conveyor belt and a glue gun, wherein:

[0027] The conveyor belt is movably arranged on the frame and is used for conveying the core board strips or the board before cutting;

[0028] The glue gun is fixed on the frame and is located above the conveyor belt, and the glue gun is connected with a glue tank;

[0029] A position sensor is fixedly arranged on the glue gun, and the position sensor is used for detecting whether there is a core board strip or a whole board under the glue gun;

[0030] The position sensor and the glue gun are electrically connected to a control unit, and the control unit is used for controlling the glue gun to discharge glue when the core board strip or the whole board reaches under the glue gun, and for controlling the glue gun to stop discharging glue when the core board strip or the whole board leaves under the glue gun.

[0031] The core board curtain structure, the three-layer solid wood floor, the method and the device for preparing the core board curtain provided by the present invention have the following beneficial effects compared with the prior art:

[0032] The core board curtain is formed by connecting core board strips in series through connectors. The core board strips are spaced apart by hot melt adhesive columns to form fixed gaps. The fixed gaps of the core board curtain form elastic stress relief grooves. The function of the adhesive columns is to retain the fixed gaps between the wooden boards and prevent the adjacent core board strips from being in close contact. The adhesive columns are elastic, and the core board strips can expand freely within a certain range, reducing or even eliminating the stress deformation caused by the expansion of the core board strips. The free swelling and shrinking performance of the core board curtain enables the floor to be used normally in various environments, and the product avoids the surface wave mark defects commonly existing in three-layer floors. The adhesive columns are attached to the sides of the core board strips through special equipment, and the adhesive column pasting efficiency is high without significantly increasing the cost of the core board curtain. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 is a schematic structural diagram of a three-layer solid wood floor in the prior art;

[0035] Figure 2 is a schematic structural diagram of a core board in the prior art;

[0036] Figure 3 is a schematic structural diagram of the core board curtain of the present invention;

[0037] Figure 4 is a schematic structural diagram of adhesive columns adhered to a whole board;

[0038] Figure 5 is a schematic diagram of the core board curtain preparation device adhering adhesive columns to a whole board;

[0039] Figure 6 is a schematic structural diagram when the whole board adhered with adhesive columns is sliced;

[0040] Figure 7 is a schematic structural diagram of adhesive columns adhered to core board strips;

[0041] Figure 8 is a schematic diagram of the core board curtain preparation device adhering adhesive columns to core board strips.

[0042] In the figures, 100, core board curtain; 200, surface board; 300, back board; 400, whole board; 1, core board strip; 11, rope groove; 2, connector; 3, adhesive column; 4, fixed gap; 5, frame; 6, conveyor belt; 7, glue gun; 8, saw blade; 9, glue tank. Detailed Embodiments

[0043] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without any creative efforts fall within the scope protected by the present invention.

[0044] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "side", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0045] See Figure 1 As shown, the three-layer solid wood floor in the prior art includes a surface board, a core board and a back board, where: the core board is located between the surface board and the back board. See Figure 2 As shown, the core board includes a plurality of core board strips, and all the core board strips are closely attached side by side. The core board is usually formed by connecting strips of pine, fir, poplar, etc. Wood has water absorption. In the prior art, due to the tight connection of the core board strips, when the equilibrium moisture content of the environment where the three-layer floor is used is higher than the moisture content of the board strips, the board strips expand, and the expansion is restricted by the surface board and the back board and cannot expand freely. The compressive stress generated by the combination of several board strips causes the floor to produce wavy deformation, commonly known as "rib marks" and "rib scars". When the thickness of the surface board is less than 4.0 mm, the wave mark phenomenon on the board surface is more serious.

[0046] In the prior art, the core board of the three-layer solid wood floor is usually composed of closely arranged board strips. When the environmental humidity changes, the core board strips expand due to water absorption or shrink due to drying, and are restricted by the surface board and the back board, resulting in wavy deformation of the board surface. The existing solutions attempt to relieve the stress by forming random gaps or inserting wood chips between the core board strips, but the random gaps cannot maintain a stable spacing, and the core board strips will still transmit stress after absorbing water, and the problem of wave marks on the board surface has not been fundamentally eliminated.

[0047] In view of the above problems, the embodiments of the present invention provide a core board curtain structure, a three-layer solid wood floor, a method for preparing a core board curtain and a preparation device. The fixed gap of the core board curtain forms an elastic stress release groove, which solves the defect of wave marks on the board surface commonly existing in three-layer floors.

[0048] The following will be combined with Figures 1-8A more detailed description of the technical solution provided by the present invention is given.

[0049] Embodiment 1:

[0050] As Figures 1-8 shown, the core board curtain structure provided by the present invention includes core board strips 1, connecting members 2 and glue columns 3, wherein: the connecting members 2 pass through all the core board strips 1, and all the core board strips 1 are connected in series to form a core board curtain 100; the glue columns 3 are fixed to the side parts of the core board strips 1, and the glue columns 3 are located between two adjacent core board strips 1 for keeping a fixed gap 4 between two adjacent core board strips 1.

[0051] Among them, the core board strip 1 refers to a strip-shaped wooden unit that constitutes the core board curtain 100, and can be specifically formed by cutting plates such as pine, fir, poplar, etc., and its length direction is consistent with the floor laying direction. The connecting member 2 refers to a flexible connecting component that penetrates through a plurality of core board strips 1, and can be specifically realized by a braided rope or a nylon thread, and is arranged at both ends of the strip through a rope groove 11 structure. The glue column 3 refers to an adhesive body with a stable volume after curing, and can be specifically made of hot melt adhesive and is directly adhered and fixed to the side part of the core board strip 1.

[0052] The core board strips 1 form a flexible series connection structure through the connecting members 2 (connecting ropes), allowing each strip to produce a small displacement in the length direction. The glue columns 3 are attached to the middle position of the contact surface between adjacent strips, and the fixed gap 4 with equal distance is forced to be formed through their physical dimensions after curing. When the environmental humidity rises, the thrust generated by the lateral expansion of the core board strips 1 is absorbed by the fixed gap 4 of the glue columns 3, and the longitudinal extension is released through the flexible connection of the series connection structure. The central arrangement of the glue columns 3 on the side of the strip ensures that the expansion force is evenly dispersed, avoiding stress concentration caused by the traditional end fixing method.

[0053] Compared with the prior art, the traditional core board adopts a structure of close splicing or random gaps, which cannot actively control the strip spacing and is easily affected by humidity changes. This solution combines the fixed gap 4 of the glue columns 3 with the flexible series connection structure, which not only ensures the stable spacing between the core board strips 1, but also provides a multi-dimensional stress release channel. Compared with the method of inserting wood chips, the glue column 3 does not absorb water and has a stable volume, fundamentally blocking the transmission path of the expansion stress.

[0054] The core board curtain structure of this embodiment effectively solves the problem of expansion and extrusion of the core board strips 1 caused by humidity changes, enabling the three-layer solid wood floor to adapt to different climate environments. The fixed gap 4 between the core board strips 1 can permanently maintain the fixed gap 4, avoiding local stress concentration caused by changes in the fixed gap 4.

[0055] As an optional implementation method, see Figure 3As shown in the figure, the connecting member 2 includes a connecting rope. A rope groove 11 is provided on the core board strip 1, and all the rope grooves 11 through which the same connecting rope passes are located on the same straight line. The connecting rope passes through the rope grooves 11 to connect all the core board strips 1 in series. The depth of the rope groove 11 is usually half of the thickness of the core board strip 1.

[0056] The connecting rope refers to a flexible linear connecting component, which can be specifically realized by a nylon rope or a polyester fiber rope. It has sufficient tensile strength to maintain the physical connection between the core board strips 1. The rope groove 11 refers to a through-hole structure provided in the length direction of the core board strip 1. Specifically, a through-hole can be formed by machining. Its inner diameter size needs to be slightly larger than the diameter of the connecting rope to ensure smooth rope threading. All the rope grooves 11 being located on the same straight line means that the central axes of the rope grooves 11 of each core board strip 1 are in the same spatial straight line. Specifically, the hole position alignment accuracy can be ensured by a positioning fixture during processing.

[0057] Specifically, when the connecting rope passes through the rope grooves 11 of each core board strip 1 in sequence, the linear arrangement of the rope grooves 11 forces each core board strip 1 to be arranged along the same axis. The free movement space of the connecting rope in the rope groove 11 allows the core board strip 1 to generate a small displacement when heated and expanded, while the constraint effect of the rope groove 11 on the connecting rope restricts the lateral offset of the core board strip 1. The contact surfaces between adjacent core board strips 1 are separated by the rubber columns 3 to form a uniform gap. This structure not only maintains the orderly arrangement between the core board strips 1 but also realizes the precise control of the gap through the cooperation relationship between the rope groove 11 and the connecting rope.

[0058] Through the above technical solution, the present application effectively solves the technical problem that the fixed gap 4 cannot be maintained when the core board strips 1 are connected in series. The cooperation structure of the connecting rope and the rope groove 11 can adapt to the material deformation caused by the change of environmental humidity and prevent the deformation of the board due to the concentration of expansion stress. The uniform distribution of the gaps avoids the phenomenon of excessive local stress and fundamentally eliminates the hidden danger of the formation of rib marks on the floor surface.

[0059] As an optional implementation manner, the number of the connecting members 2 is at least two, and the two connecting members 2 pass through the opposite ends of the core board strip 1 respectively; on the same core board strip 1, the number of the rubber columns 3 is at least two, and the rubber columns 3 are arranged at intervals along the length direction of the corresponding core board strip 1. The rubber columns 3 being arranged at intervals along the length direction means that a plurality of spaced-apart gelatinous support points are provided on the surface of a single core board strip 1. Specifically, it can be formed by bonding with an automatic dispensing device according to a preset spacing, and this arrangement forms a segmented support system.

[0060] The above structure can prevent the deflection and distortion caused by single-point connection and can effectively improve the anti-twisting ability of the core board curtain structure.

[0061] As an optional implementation, the glue post 3 is a cylindrical structure. The height of the glue post 3 is not greater than the thickness of the core board strip 1, and the glue post 3 does not protrude from the surface of the core board strip 1, which is convenient for fixing the surface board 200 and the back board 300. The glue post 3 not protruding from the surface of the core board strip 1 means that the glue post 3 is completely embedded in the side of the core board strip 1, which is achieved by controlling the bonding positioning accuracy to avoid the exposed part interfering with the assembly of adjacent boards.

[0062] Among them, the thickness range of the core board strip 1 is 6 - 15 mm, and the most widely used is 9.0 - 11.5 mm; the width range of the core board strip 1 is 20 - 55 mm, and the best range is 2.5 - 4.0 mm; the length of the core board strip 1 is the width of the core board curtain 100, which can be configured according to the width of the floor; the length of the core board curtain 100 can be configured according to the length of the floor.

[0063] As an optional implementation, in this embodiment, the diameter of the glue post 3 is 0.5 mm - 1 mm, so that the fixing gap 4 between two adjacent core board strips 1 is between 0.5 mm - 1 mm; all the fixing gaps 4 on the core board curtain 100 are equal.

[0064] The following issues are considered when setting the value of the above-mentioned fixing gap 4: The dimensional stability of four kinds of woods, namely Pinus sylvestris var. mongolica, Picea asperata, Populus davidiana, and Zelkova serrata, was measured under the conditions of temperature (20 ± 2) °C, relative humidity (65 ± 5)%, (86 ± 5)%, and (33 ± 5)%. The results show that after taking the average value of the tangential swelling and shrinkage rates, the size ranking is: Zelkova serrata (1.247%) > Picea asperata (1.021%) > Populus davidiana (0.908%) > Pinus sylvestris var. mongolica (0.858%). In the selection of the material for solid wood floors, Picea asperata, Pinus sylvestris var. mongolica, and Populus davidiana are usually used, and Zelkova serrata is rarely used. Among Picea asperata, Pinus sylvestris var. mongolica, and Populus davidiana, Picea asperata has the largest tangential swelling and shrinkage rate. Therefore, when setting the fixing gap 4, Picea asperata is taken as an example for calculation. If the tangential swelling and shrinkage rate of Picea asperata is less than the fixing gap 4, then Pinus sylvestris var. mongolica and Populus davidiana will surely meet the requirements. If Picea asperata is selected as the material of the core board strip 1, the tangential swelling and shrinkage rate of Picea asperata is 1.021%. Suppose the width of the core board strip 1 (made of Picea asperata) is 50 mm, then the core board strip 1 made of Picea asperata expands by 1.021% * 50 = 0.5 mm, and each side of the core board strip 1 expands by 0.25 mm. Therefore, the fixing gap 4 is usually set to 0.5 - 1 (slightly larger than 0.25 mm), which is more appropriate.

[0065] The glue post 3 forms a support body after curing, and its diameter value is limited within a specific range, so that the core board strips 1 will neither cause the concentration of expansion stress due to too small a gap nor cause the structure to be loose due to too large a gap. In a humid environment, the gap corresponding to the diameter of the glue post 3 allows a slight displacement when the core board strip 1 expands, avoiding stress accumulation; in a dry environment, the rigid support of the cured glue post 3 can prevent the gap from expanding and causing the core board strip 1 to shrink excessively.

[0066] The hot melt adhesive in the prior art, used as the adhesive column 3 in this embodiment, cannot operate properly, and mainly has the following problems: 1. For the hot melt adhesive with a low melting point, when sawing and slicing, the saw blade 8 generates heat, causing the adhesive column 3 to melt, and the adhesive film coats the surface of the saw blade 8, making continuous processing impossible, and the running saw results in an excessive slicing thickness; 2. The hot melt adhesive with a high melting point has poor adhesiveness, and the adhesive column 3 falls off during the slicing process; 3. The hot melt adhesive with a low solid content cannot form the adhesive column 3 and fails to isolate the core board strips 1 equally.

[0067] In response to the above problems, the adhesive column 3 in this embodiment comprises raw materials in the following parts by weight: 45 - 55 parts of ethylene-vinyl acetate, 20 - 30 parts of resin, 5 - 15 parts of paraffin wax, and 10 - 20 parts of rosin. Preferably, it is 50 parts of ethylene-vinyl acetate, 25 parts of resin, 10 parts of paraffin wax, and 15 parts of rosin.

[0068] Ethylene-vinyl acetate refers to a copolymer with elastic deformation ability, which provides flexibility and interfacial adhesion strength as the matrix material of the adhesive column 3. The ethylene-vinyl acetate (EVA) and resin components can play a good role in wetting and gluing strength, and by different proportions, they can solve the problems of low melting point and poor viscosity. Paraffin wax refers to a mixture of alkanes with a melting point between 50 and 70 degrees Celsius, and specifically, microcrystalline wax can be used to achieve this, which acts as a hydrophobic component to reduce the water absorption rate of the adhesive column 3. Rosin refers to a mixture of natural resin acids, and specifically, hydrogenated rosin can be used to achieve this, which is used to enhance the adhesion of the adhesive column 3 to the wood surface and assist in forming a crystalline structure. Paraffin wax and rosin can solve the problem of the adhesive particles sticking to the saw blade 8 during frame saw slicing. After the adhesive column 3 cools, it can effectively increase the hardness and ensure the equal seam gap.

[0069] Specifically, by controlling the content of ethylene-vinyl acetate in the range of 45 to 55 parts, the adhesive column 3 has the ability to bear the pressure of the core board strip 1 while maintaining sufficient elasticity. The addition of 20 to 30 parts of resin enables the adhesive column 3 to form a rigid skeleton structure, preventing the gap from changing due to long-term pressure. Paraffin wax is uniformly dispersed inside the adhesive column 3 in a proportion of 5 to 15 parts to form a hydrophobic barrier, blocking the water penetration path. Rosin forms a microcrystalline structure during the curing process of the adhesive column 3 in a proportion of 10 to 20 parts, which not only strengthens the chemical bond with the wood but also compensates for the dimensional fluctuations caused by temperature changes through the phase change characteristics. The four types of components form an interpenetrating network structure through melt blending, maintaining the volume stability of the adhesive column 3 under dynamic temperature and humidity conditions, thereby precisely maintaining the fixed gap 4 between adjacent core board strips 1.

[0070] The core board curtain structure of this embodiment realizes the long-term stability of the gaps between the core board strips 1 in a humid environment, effectively blocks the interaction force generated by the moisture absorption and expansion of the core board strips 1, and fundamentally eliminates the wave deformation defect formed by stress concentration on the floor surface. The hydrophobic property and structural stability of the adhesive column 3 material system work together to maintain the balance of the core layer structure of the floor in both high-temperature and dry environments and high-humidity environments.

[0071] In the core board curtain structure of this embodiment, the core board curtain 100 is formed by connecting the core board strips 1 in series through the connectors 2. The core board strips 1 are spaced apart by the hot-melt adhesive columns 3 to form fixed gaps 4. The fixed gaps 4 of the core board curtain 100 form elastic stress release grooves. The function of the adhesive columns 3 is to retain the fixed gaps 4 between the wooden boards and prevent the adjacent core board strips 1 from being in close contact. The adhesive columns 3 are elastic, and the core board strips 1 can freely expand within a certain range, reducing or even eliminating the stress deformation caused by the expansion of the core board strips 1. The free moisture expansion and contraction performance of the core board curtain 100 enables the floor to be used normally in various environments, and the product avoids the surface wave mark defects commonly existing in three-layer floors. The adhesive columns 3 are attached to the sides of the core board strips 1 through special equipment, and the pasting efficiency of the adhesive columns 3 is high, without significantly increasing the cost of the core board curtain 100.

[0072] Embodiment 2:

[0073] This embodiment also provides a three-layer solid wood floor, including a surface board 200, a back board 300 and the above-mentioned core board curtain structure. The surface board 200 is fixed on the upper surface of the core board curtain 100, and the back board 300 is fixed on the lower surface of the core board curtain 100.

[0074] The three-layer solid wood floor of this embodiment can balance the expansion demand of the core board strips 1 in a humid environment and the shrinkage compensation in a dry environment. The fixing effects of the surface board 200 and the back board 300 ensure the overall structural stability of the floor, and the fixed gaps 4 of the core board curtain 100 eliminate local stress concentration. For example, in a high-temperature and dry environment, the shrinkage of the core board strips 1 can be avoided by evenly distributing the gaps to prevent the surface board 200 from cracking; in a humid environment, the lateral stress generated by expansion is absorbed by the gaps, preventing the surface board 200 from having wave deformation. This solution effectively solves the problem of rib marks caused by limited expansion of the core board strips 1, and at the same time takes into account the structural stability in different humidity environments.

[0075] As an optional implementation method, the moisture content of the surface board 200, the back board 300 and the core board curtain 100 is between 5 - 15%, preferably, the moisture content of the surface board 200, the back board 300 and the core board curtain 100 is between 9 - 10%, and it can be adjusted up and down by 1 - 5% when the floor is used in a special environment.

[0076] When setting the moisture content value, the equilibrium moisture content of wood under the environmental temperature and relative humidity conditions in the southern and northern environments was comprehensively considered, and the intermediate value of the equilibrium moisture content of wood in the southern and northern environments was selected, that is, 9-10%.

[0077] When the moisture content of the three-layer structure is in the same equilibrium state, the surface board 200 and the core board curtain 100 expand synchronously in a humid environment, and the back board 300 and the core board curtain 100 contract synergistically in a dry environment. This synchronous deformation behavior eliminates the expansion gradient caused by the moisture content difference between layers and avoids the accumulation of interlayer shear stress. By controlling the moisture content in the range of 9-10%, it not only prevents the core board curtain 100 from expanding excessively and squeezing the surface board 200 in the high-humidity environment in the south, but also prevents the core board curtain 100 from shrinking excessively and cracking the surface board 200 under the dry conditions in the north.

[0078] This solution synchronously regulates the moisture content of the three layers, enabling the surface board 200, the core board curtain 100, and the back board 300 to form an overall deformation system, fundamentally eliminating the structural damage caused by the deformation lag of a single layer. Through the above technical solution, this application solves the problems of rib marks and cracking of the surface board 200 caused by the asynchronous expansion and contraction of each layer of the three-layer solid wood floor in different humidity environments in the north and south, enables the floor to maintain the overall structural stability when the environmental humidity changes, and avoids surface wave mark defects caused by local stress concentration.

[0079] Example 3:

[0080] This embodiment provides a method for preparing a core board curtain for preparing the above-mentioned core board curtain structure. The method includes: drying the board: making the moisture content of the board uniformly balanced at 9-10%; cutting and polishing the board; adhering glue columns 3 on the board, slicing the board with the glue columns 3 adhered, and cutting out the core board strips 1 fixed with the glue columns 3; or slicing the board, cutting the board into core board strips 1, and adhering glue columns 3 on the core board strips 1; stringing the curtain: passing the connecting piece 2 through all the core board strips 1 to string all the core board strips 1 into the core board curtain 100; palletizing, winding and sealing to prevent the core board curtain 100 from absorbing moisture excessively and ensuring that the moisture content of the core board meets the process requirements during the pressing of the three-layer floor.

[0081] Among them, drying the board means making the internal moisture of the wood evenly distributed through hot air circulation or steam treatment, which can be specifically realized by a constant temperature drying chamber. This step makes the moisture content of the wood reach an equilibrium state with the environmental humidity and reduces the subsequent deformation amount. Adhering the glue columns 3 means fixing spacers on the surface of the board or the side of the cut core board strip 1, and the glue columns 3 act as a support body to restrict the relative positions of adjacent core board strips 1 to form a fixed gap 4.

[0082] See Figure 5 and Figure 6As shown, adhesive columns 3 can be adhered to the entire sheet 400, and then the sheet with the adhered adhesive columns 3 is sliced by a plurality of equally spaced saw blades 8. Or, as Figure 7 and Figure 8 shown, after slicing the entire sheet 400 to form curtain board strips, the adhesive columns 3 are then fixed to the curtain board strips. The stringing process of the curtain refers to forming a chain structure by passing a flexible connecting member 2 through the core board strips 1, which can be specifically realized by an automated rope threading device. The connecting member 2 allows the core board curtain 100 to generate an overall elastic deformation when it gets damp.

[0083] Example 4

[0084] This embodiment provides a core board curtain preparation device for manufacturing the above-mentioned core board curtain structure. The device includes a frame 5, a conveyor belt 6, and a glue gun 7, where: The conveyor belt 6 is movably arranged on the frame 5 and is used to convey the core board strips 1 or the sheet before cutting; The glue gun 7 is fixed on the frame 5 and is located above the conveyor belt 6. The glue gun 7 is connected to a glue tank 9; A position sensor is fixedly arranged on the glue gun 7, and the position sensor is used to detect whether there is a core board strip 1 or the entire sheet 400 below the glue gun 7; The position sensor and the glue gun 7 are electrically connected to a control unit, and the control unit is used to control the glue gun 7 to discharge glue when the core board strip 1 or the entire sheet 400 reaches below the glue gun 7, and is used to control the glue gun 7 to stop discharging glue when the core board strip 1 or the entire sheet 400 leaves below the glue gun 7.

[0085] The conveyor belt 6 refers to a conveying device with a translation drive mechanism, which can be specifically realized by a structure where a motor drives rollers to drive a belt to move, ensuring the synchronization of the processing rhythm and the glue column 3 coating action through uniform conveying.

[0086] Among them, the glue gun 7 refers to a glue liquid spraying device with an opening and closing valve, which can be specifically realized by a mechanical structure where an electromagnetic valve controls the on-off of the glue path. The glue tank 9 continuously supplies glue to keep the glue gun 7 at a stable glue discharging pressure.

[0087] Among them, the position sensor refers to a non-contact detection element, which can be specifically realized by an infrared photoelectric sensor or an ultrasonic sensor, and judges whether there is a target object in a specified area of the conveyor belt 6 by emitting a detection signal. The control unit refers to a logic controller with signal processing functions, which can be specifically realized by a PLC or a single-chip microcomputer circuit, and triggers the start and stop actions of the glue gun 7 by receiving the sensor signal and maintains the timing accuracy.

[0088] Specifically, referring to Figure 5 and Figure 8 shown, the conveyor belt 6 conveys the core board strips 1 (refer to Figure 8 ) or the entire sheet 400 (refer to Figure 5)It is conveyed uniformly along the set path. When the front end of the material enters the area directly below the glue gun 7, the position sensor sends a trigger signal to the control unit, and the control unit immediately starts the glue gun 7 to discharge glue to form the glue column 3. When the end of the material leaves the detection area, the sensor signal disappears, and the control unit closes the glue gun 7 to stop glue application. The glue column 3 is formed only during the period when it is covered by the detected material, ensuring that the glue column 3 is accurately formed at the preset position on the side of the material. This action is executed in a loop, so that the glue columns 3 with consistent positions and glue amounts are formed on the sides of each core board strip 1, and the adjacent core board strips 1 maintain a fixed gap 4 through the glue columns 3 in the subsequent string curtain process.

[0089] Compared with the prior art, the control of the gap between the traditional core board strips 1 relies on manual placement of spacers or random segmentation, with defects such as offset of the position of the glue column 3 and large fluctuations in the gap size. In this solution, the start and stop of the glue gun 7 are linked by sensor detection to achieve automatic alignment of the coating position of the glue column 3 with the edge of the material, eliminating manual operation errors; the conveyor belt 6 is used for uniform feeding in cooperation with timing control to ensure the uniformity of the spacing of the glue columns 3 and avoid abnormal gaps caused by too much or too little glue volume.

[0090] This application realizes the precise coating of the glue column 3 at the predetermined position on the side of the core board strip 1, ensuring the dimensional consistency of the fixed gap 4 between adjacent core board strips 1 after segmentation. The glue column 3 is formed only in the area covered by the material, avoiding glue waste and surface contamination; the uniform distribution of the gaps enables the core board curtain 100 to release stress uniformly during the subsequent thermal expansion and contraction of the floor, effectively suppressing the generation of surface wave mark defects.

[0091] In the description of this specification, specific features, structures, or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0092] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0093] The above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. A core panel curtain structure, characterized in that: It includes core strips, connectors and glue posts, including: The connecting piece passes through all the core strips, and all the core strips are connected in series to form a core strip curtain; The glue column is fixed to the side of the core plate strip, and the glue column is located between two adjacent core plate strips, and is used to maintain a fixed gap between the two adjacent core plate strips.

2. The core panel curtain structure according to claim 1, characterized in that: The connecting member comprises a connecting rope, and the core strips are provided with rope grooves, and all the rope grooves through which the same connecting rope passes are located on the same straight line, and the connecting rope passes through the rope grooves to connect all the core strips in series.

3. The core panel curtain structure according to claim 1, characterized in that: The number of the connecting members is at least two, and the two connecting members pass through opposite ends of the core strip respectively; On the same core strip, the number of the glue columns is at least two, and the glue columns are arranged at intervals along the length direction of the corresponding core strip.

4. The core panel curtain structure according to claim 1, characterized in that: The glue column is a cylindrical structure, the height of the glue column is not greater than the thickness of the core plate strip, and the glue column does not protrude from the surface of the core plate strip.

5. The core panel curtain structure according to claim 1, characterized in that: The diameter of the glue column is 0.5mm-1mm, so that the fixed gap between two adjacent core strips is between 0.5mm-1mm; All the fixed gaps on the core panel curtain are equal.

6. The core panel curtain structure according to claim 1, characterized in that: The rubber column comprises the following raw materials in parts by weight: 45-55 parts of ethylene-vinyl acetate, 20-30 parts of resin, 5-15 parts of paraffin wax and 10-20 parts of rosin.

7. A three-layer solid wood floor, characterized in that: It comprises a surface plate, a back plate and the core panel curtain structure according to any one of claims 1 to 6, wherein the surface plate is fixed to the upper surface of the core panel curtain, and the back plate is fixed to the lower surface of the core panel curtain.

8. The three-layer solid wood floor according to claim 7, characterized in that: The moisture content of the surface board, the back board and the core board curtain is between 5% and 15%.

9. A method for preparing a core board curtain, characterized in that: For preparing the core panel curtain structure according to any one of claims 1 to 6, the method comprises: Board drying: make the moisture content of the board uniform and balanced at 9-10%; Plate cutting and polishing; Adhere the glue column to the board, slice the board with the glue column, and cut out the core board strips fixed with the glue column; or slice the board, cut the board into core board strips, and adhere the glue column to the core board strips; String curtains: Make the connecting piece pass through all the core board strips, and connect all the core board strips in series to form the core board curtain.

10. A core board curtain preparation device, characterized in that: Used to manufacture the core panel curtain structure according to any one of claims 1 to 6, the device comprises a frame, a conveyor belt and a glue gun, wherein: The conveyor belt is movably arranged on the frame and is used to convey the core board strips or the boards before cutting; The glue gun is fixed on the frame and is located above the conveyor belt, and the glue gun is connected to a glue box; A position sensor is fixedly arranged on the glue gun, and the position sensor is used to detect whether the core board strip or the whole board exists below the glue gun; The position sensor and the glue gun are electrically connected to a control unit, which is used to control the glue gun to discharge glue when the core plate strip or the whole plate arrives under the glue gun, and to control the glue gun to stop discharging glue when the core plate strip or the whole plate leaves under the glue gun.

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