Plywood with high crack resistance and preparation method thereof

Abstract

The invention provides plywood with high crack resistance and a preparation method thereof, belongs to the technical field of plywood, and solves the technical problems that existing plywood is insufficient in crack resistance, and a preparation method is insufficient in integrity and continuity, relatively high in economic cost and time cost and the like. The plywood with the high crack resistance comprises an upper face plate, a lower face plate, a middle plate and two glass fiber nets, one glass fiber net is located between the upper face plate and the middle plate, the other glass fiber net is located between the lower face plate and the middle plate, wood fibers of the upper face plate and wood fibers of the lower face plate face the same direction, and the two glass fiber nets are arranged in the same direction. The wood fibers of the middle-layer plate face the wood fibers perpendicular to the upper panel and the lower panel, the thickness of the middle-layer plate is the sum of the thickness of the upper panel and the thickness of the lower panel, and grooves are formed in the upper sides of the middle-layer plate and the lower panel. The method has the advantages that the crack resistance of the plywood is improved, the integrity and the production efficiency during preparation are improved, and meanwhile, the tidiness and smoothness of the edge of a manufactured finished product are guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of plywood preparation, and relates to a plywood, in particular to a plywood with strong crack resistance and a preparation method thereof. Background Art

[0002] At present, plywood is one of the commonly used materials for furniture and one of the three major artificial boards. The specific structure of plywood is obtained by gluing multiple layers of board skins and other material layers. Since they all adopt a layered block design, their complete crack resistance is mainly guaranteed by the adhesive between different board skins or between the board skins and other material layers; and the strength of plywood is mainly determined by the board skins, adhesives and other material layers. At the same time, the texture of the board skins and the materials and specific forms used in other material layers will also affect the strength of the plywood to a certain extent. For this reason, such structural characteristics lead to the fact that when plywood is subjected to a force perpendicular to the board surface, due to the different deformation radii between different layers of board skins or between the board skins and other material layers, a relative displacement along the board surface will be generated between different layers of board skins or between the board skins and other material layers. If the relative displacement is too large, the adhesive between different layers of board skins or between the board skins and other material layers will break and separate from the surface of the bonding structure, causing the plywood to crack, which in turn leads to low strength and poor compressive resistance of the plywood.

[0003] After searching, it is found that a Chinese patent document discloses a plywood and a preparation method thereof [Application No.: 201611236014.9; Publication No.: CN 106827109 A]. This plywood includes multiple layers of veneers, and the preparation method includes: coating the surface of the veneers with an adhesive, stacking the veneers, pre-cold pressing and then hot pressing or hot pressing to cure the adhesive, and finally impregnating the surface of the plywood so that one or more layers of veneers contain a preservative and / or a flame retardant. The plywood has good anti-corrosion performance and can have both anti-corrosion and flame retardant properties, but the plywood is insufficient in terms of crack resistance, so it cannot bear a higher load and has a small scope of application. In addition, the preparation method lacks integrity and continuity, and requires the use of multiple independent equipment for preparation, which has high economic and time costs. Summary of the invention

[0004] The first purpose of the present invention is to address the above-mentioned problems in the existing technology and to propose a plywood with strong crack resistance. The technical problem to be solved by the present invention is: how to improve the crack resistance of the plywood and improve the integrity and production efficiency during preparation, while ensuring that the edges of the finished product are neat and smooth.

[0005] The first object of the present invention can be achieved by the following technical solutions: A plywood with strong crack resistance comprises an upper panel, a lower panel, a middle panel and two glass fiber meshes, wherein one of the glass fiber meshes is located between the upper panel and the middle panel, and the other glass fiber mesh is located between the lower panel and the middle panel, the wood fibers of the upper panel and the lower panel are oriented in the same direction, the wood fibers of the middle panel are oriented perpendicular to the wood fibers of the upper panel and the lower panel, the thickness of the middle panel is the sum of the thickness of the upper panel and the lower panel, and grooves are provided on the upper sides of the middle panel and the lower panel.

[0006] By adopting the above structure, the crack resistance of the plywood can be enhanced, and the groove can prevent glue from overflowing.

[0007] The second purpose of the present invention is to propose a method for preparing plywood with strong crack resistance in view of the above-mentioned problems in the existing technology. The technical problem to be solved by the invention is: how to reduce the amount of equipment used in the preparation process, thereby reducing the influence of external factors, improving the bonding effect of plywood, and ensuring the yield of finished products.

[0008] The second object of the present invention can be achieved by the following technical solutions: A method for preparing plywood with strong crack resistance comprises the following steps: Step 1: Cut the upper panel, middle panel and lower panel into preset sizes, and polish the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 25-40°C for 100-150 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 100-140°C until its moisture content reaches 15-20%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 140-180°C until the moisture content reaches 5-8%; Step 5: Move the dried wood veneer to the gluing assembly by using the transmission assembly, apply phenolic resin glue to the upper surfaces of the middle board and the lower panel at the same time by using the gluing mechanism, and smooth the phenolic resin glue by using the smoothing assembly during the gluing; Step 6. After the gluing is completed, use the transmission component to move the wood veneer to the hot pressing mechanism, and use the clamping component to place the lower panel on the lower hot pressing plate, and place the upper panel and the middle panel on the two fiberglass nets respectively. Then, use the cooperation of the upper and lower hot pressing plates to press the three wood veneers and the two fiberglass nets. At the same time, use the cutting component to cut the edge of the plywood, the overflow glue and the fiberglass net to obtain a plywood with neat and smooth edges.

[0009] Preferably, in step five, the amount of glue applied on the middle panel and the lower panel is 330-380 g / m2.

[0010] Preferably, the hot pressing temperature in step six is ​​110-120° C., and the pressing time is 40-60 min.

[0011] Preferably, the device used in steps 2 to 6 is an integrated preparation device, which includes a base, a clamping assembly and an upper hot pressing plate, a first support column and two second support columns are fixedly connected to the base, a support beam is fixedly connected between the two second support columns, a transmission assembly is arranged between the support beam and the first support column, a moving block is connected to the transmission assembly, two first cylinders are fixedly connected to the lower side of the moving block, the telescopic ends of the two first cylinders are connected to the clamping assembly, a soaking assembly and a gluing assembly are arranged on the base, a hot pressing seat, four first support rods and four second support rods are fixedly connected to the base, wherein the two first support rods and the two second support rods are located on the left side of the hot pressing seat, and the other two first support rods are located on the left side of the hot pressing seat. The rod and two second support rods are located on the right side of the hot press seat, the height of the first support rod is higher than the second support rod, the first material release roller is rotatably connected between the two first support rods on the left side of the hot press seat, the second material release roller is rotatably connected between the two second support rods on the left side of the hot press seat, the first winding material roller is rotatably connected between the two first support rods on the right side of the hot press seat, the second winding material roller is rotatably connected between the two second support rods on the right side of the hot press seat, and glass fiber mesh is wound between the first winding material roller and the first material release roller and between the second winding material roller and the second material release roller, a lower hot press plate is fixedly connected to the hot press seat, a collecting trough is provided on the hot press seat, two second cylinders are fixedly connected to the lower side of the support beam, and the telescopic ends of the two second cylinders are fixedly connected to the upper hot press plate.

[0012] With the above structure, when working, the upper panel, middle panel and lower panel in step one are clamped by the clamping assembly, and then the moving block is driven to move to the top of the soaking assembly by the transmission assembly, and the two first cylinders are started. The telescopic ends of the two first cylinders jointly drive the clamping assembly and the three wooden boards to move into the soaking assembly, so as to soak the upper panel, middle panel and lower panel, and then the clamping assembly and the wooden boards are lifted out of the soaking assembly by the first cylinder, and then the wooden boards are driven to move to the gluing assembly by the transmission assembly, and the wooden boards are driven to move to the gluing assembly by the transmission assembly and the first cylinder for gluing, and then the transmission assembly is used to drive the wooden boards to move to the gluing assembly for gluing. The cooperation of the transmission component and the first cylinder moves the three wooden boards so that one layer of glass fiber mesh is located between the upper panel and the middle panel, and the other layer of glass fiber mesh is located between the middle panel and the lower panel. Subsequently, the upper panel is placed on the upper glass fiber mesh, the middle panel is placed on the lower glass fiber mesh, and the lower panel is placed on the lower hot pressing plate through the clamping component. Subsequently, the clamping component is removed through the transmission component, and the second cylinder is started. The telescopic end of the second cylinder drives the upper hot pressing plate to move downward, thereby cutting and pressing the three wooden boards and the two glass fiber meshes, so as to facilitate the preparation of plywood with neat edges, and the plywood has good crack resistance.

[0013] Preferably, the transmission component includes a sliding rod and a screw rod, the sliding rod is fixedly connected between the first support column and the support beam, a third motor is fixedly connected to the first support column, an output shaft of the third motor passes through the first support column and is fixedly connected to the screw rod, the other end of the screw rod is rotatably connected to the support beam, a slider is slidably connected to the sliding rod, the lower side of the slider is fixedly connected to the moving block, and the moving block is threadedly connected to the screw rod.

[0014] With the above structure, the third motor is started, and the output shaft of the third motor drives the screw to rotate, which is connected with the thread of the moving block, thereby driving the moving block to move.

[0015] Preferably, the clamping assembly includes a mounting seat, which is fixedly connected to the two first cylinder telescopic ends, and a driving box is fixedly connected to the lower end of the mounting seat, and three double-threaded screws are rotatably connected in the driving box, and the left and right half threads of the three double-threaded screws are opposite, and the middle parts of the three double-threaded screws are fixedly connected to the first gear, and three motor seats are fixedly connected in the driving box, and the three motor seats are respectively located below the three double-threaded screws, and the three motor seats are fixedly connected to the first motors, and the three first motor output shafts are fixedly connected to the second gear, and the three second gears are respectively meshed with the three first gears, and the three double-threaded screws are threadedly connected to two threaded blocks, and the two threaded blocks are respectively located in the left and right parts of the double-threaded screws, and the six threaded blocks are fixedly connected to the clamping box through connecting columns, and the lower sides of the two clamping boxes located above are fixedly connected to the supporting plates, and the supporting plates are fixedly provided with inclined plates, and two hot air blowers are fixedly connected in the driving box, and the two hot air blowers are fixedly connected to the air outlet pipes, and the other ends of the two air outlet pipes extend out of the driving box from one side of the clamping box.

[0016] When the wood is put into the workpiece, the three wooden boards are put into the workpiece and the workpiece is put into the workpiece.

[0017] Preferably, the glue coating assembly includes a glue coating box, two transmission boxes are fixedly connected to the left side of the glue coating box, a glue storage box is fixedly connected to the right side of the glue coating box, two connecting pipes are fixedly connected to the glue storage box near the side of the glue coating box, glue inlet pipes are slidably connected to the two connecting pipes, the other ends of the two glue inlet pipes are connected to glue delivery pipes, a number of nozzles are arranged on the lower side of the two glue delivery pipes, rubber sleeves are fixedly connected to one end of the two glue delivery pipes near the connecting pipes, the other ends of the two rubber sleeves are respectively fixedly connected to the two connecting pipes, and a smoothing assembly is fixedly connected to the lower side of the two glue delivery pipes.

[0018] With the above structure, when working, the middle board and the lower panel are moved to the bottom of the two glue delivery pipes respectively through the cooperation of the transmission component and the first cylinder, the wooden board is moved to the inside of the glue coating box through the transmission component, and the nozzle is started to spray glue on the upper surface of the middle board and the lower panel, and then the glue is smoothed by the smoothing component, so that the fit between the board and the glass fiber mesh is more comprehensive and firm.

[0019] Preferably, the smoothing assembly includes a second horizontal plate, on which a number of smoothing blocks are evenly distributed, a first connecting rod is fixedly connected to the left end of the rubber delivery hose, second motors are fixedly connected to the two transmission boxes, two second motor output shafts are fixedly connected to turntables, two turntables are rotatably connected to second connecting rods, and the two second connecting rods are rotatably connected to the two first connecting rods respectively.

[0020] With the above structure, when smoothing, the first cylinder drives the clamping assembly to rise until the plate contacts the second horizontal plate, and then the plate is moved outward through the transmission assembly. At the same time, the two second motors are started, and the output shafts of the two second motors respectively drive the two turntables to rotate. The two turntables respectively drive the rubber delivery hose to move left and right through the two first connecting rods and the two second connecting rods, and the rubber delivery hose drives the second horizontal plate and the smoothing block to move left and right, thereby smoothing the glue.

[0021] Preferably, the upper hot press plate includes a cutting box, in which an upper press plate is slidably connected, a plurality of springs are fixedly connected to the upper end of the upper press plate, the other ends of the plurality of springs are fixedly connected to the cutting box, a clamping block is fixedly connected to the cutting box, the lower edge of the cutting box is a wavy blade, a cutter is fixedly connected to the side of the cutting box, and an inclined plate is fixedly connected to the inner periphery of the cutter.

[0022] With the above structure, during pressing, the output end of the second cylinder drives the cutting box to move downward. During the movement, the cutter first contacts the first layer of glass fiber mesh. After cutting the first layer of glass fiber mesh, the cutting box is driven upward by the second cylinder, and then the upper panel and the first layer of glass fiber mesh are lowered onto the middle panel through the clamping assembly. Then the second cylinder drives the cutting box to descend and cut the second layer of glass fiber mesh. Then the cutting box rises again, and the middle panel and the second layer of glass mesh are lowered onto the lower panel through the clamping assembly. At the same time, the upper pressing plate contacts the upper panel, and then the cutting box continues to descend to cut the edge of the plate. When the upper pressing plate moves to contact the block, the cutting box drives the upper pressing plate to descend together, and cooperates with the lower hot pressing plate to press the three plates and the two glass fiber meshes together. The wavy line blade can increase the pressure at the contact point for easy cutting.

[0023] Compared with the prior art, the plywood with strong crack resistance and the preparation method thereof have the following advantages: 1. The plywood and preparation method of the present invention are scientific and reasonable, which can improve the crack resistance of the plywood and improve the integrity and production efficiency during preparation, while ensuring the neatness and smoothness of the edges of the finished products, thereby reducing the amount of equipment used in the preparation process, thereby reducing the influence of external factors, improving the bonding effect of the plywood, and ensuring the yield rate.

[0024] 2. During operation, the upper panel, middle panel and lower panel in step 1 are clamped by the clamping assembly, and then the moving block is driven to move to the top of the soaking assembly by the transmission assembly, and the two first cylinders are started. The telescopic ends of the two first cylinders jointly drive the clamping assembly and the three wooden boards to move into the soaking assembly, so as to soak the upper panel, middle panel and lower panel, and then the clamping assembly and the wooden boards are lifted out of the soaking assembly by the first cylinder, and then the wooden boards are driven to move to the gluing assembly by the transmission assembly, and the wooden boards are driven to move to the gluing assembly by the transmission assembly and the first cylinder for gluing, and then the transmission assembly is used to transfer the wooden boards to the gluing assembly. The cooperation of the first air cylinder and the second air cylinder moves the three wooden boards, so that one layer of glass fiber mesh is located between the upper panel and the middle panel, and the other layer of glass fiber mesh is located between the middle panel and the lower panel. Subsequently, the upper panel is placed on the upper glass fiber mesh, the middle panel is placed on the lower glass fiber mesh, and the lower panel is placed on the lower hot pressing plate through the clamping assembly. Subsequently, the clamping assembly is removed through the transmission assembly, and the second air cylinder is started. The telescopic end of the second air cylinder drives the upper hot pressing plate to move downward, thereby cutting and pressing the three wooden boards and the two glass fiber meshes, so as to facilitate the preparation of plywood with neat edges, and the plywood has good crack resistance.

[0025] 3. The first horizontal plate can prevent the clamping plate from sticking to the wooden board, and at the same time limit the falling of the board to ensure that the board falls vertically.

[0026] 4. Smoothing components can make the fit between the board and the fiberglass mesh more comprehensive and firm.

[0027] 5. The wavy blade can increase the pressure at the contact point, making it easier to cut. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The present invention is a process flow chart for preparing the plywood with strong crack resistance.

[0029] Figure 2 It is an experimental table in the present invention.

[0030] Figure 3 It is the plywood in the present invention.

[0031] Figure 4 It is a schematic diagram of the explosion of the plywood in the present invention.

[0032] Figure 5 It is a structural schematic diagram of the preparation equipment in the present invention.

[0033] Figure 6 It is a right side view of the preparation equipment in the present invention.

[0034] Figure 7 It is a cross-sectional view of the upper hot pressing plate in the present invention.

[0035] Figure 8It is a cross-sectional view of the glue coating component in the present invention.

[0036] Fig. 9 It is a structural schematic diagram of the rubber delivery hose in the present invention.

[0037] Fig.10 It is a structural schematic diagram of the clamping plate in the present invention.

[0038] Fig.11 It is a cross-sectional view of the clamping assembly in the present invention.

[0039] Fig.12 It is a structural schematic diagram of the hot pressing seat in the present invention.

[0040] In the figure, 1, upper panel; 2, lower panel; 3, middle panel; 4, glass fiber mesh; 5, base; 6, first support column; 7, second support column; 8, support beam; 9, moving block; 10, first cylinder; 11, hot pressing seat; 12, first support rod; 13, second support rod; 14, first material release roller; 15, second material release roller; 16, first coiling roller; 17, second coiling roller; 18, lower hot pressing plate; 19, collecting trough; 20, second cylinder; 21, sliding rod; 22, screw; 23, third motor; 24, slider; 25, mounting seat; 26, drive box; 27, double pressure screw; 28, the first a gear; 29, a motor seat; 30, a first motor; 31, a second gear; 32, a threaded block; 33, a connecting column; 34, a clamping box; 36, a glue coating box; 37, a transmission box; 38, a glue storage box; 39, a spring; 40, a connecting pipe; 41, a glue inlet pipe; 42, a glue delivery pipe; 43, a nozzle; 44, a rubber sleeve; 45, a second horizontal plate; 46, a smoothing block; 47, a first connecting rod; 48, a second motor; 49, a turntable; 50, a second connecting rod; 51, a cutting box; 52, an upper pressure plate; 53, a support plate; 54, a hot air blower; 55, an air outlet pipe; 56, a cutter; 57, a ramp; 58, a groove. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Example

[0042] like Figure 3 As shown, a plywood with strong crack resistance includes an upper panel 1, a lower panel 2, a middle panel 3 and two glass fiber meshes 4, one of the glass fiber meshes 4 is located between the upper panel 1 and the middle panel 3, and the other glass fiber mesh 4 is located between the lower panel 2 and the middle panel 3. The wood fibers of the upper panel 1 and the lower panel 2 are in the same direction, the wood fibers of the middle panel 3 are oriented perpendicular to the wood fibers of the upper panel 1 and the lower panel 2, the thickness of the middle panel 3 is the sum of the thickness of the upper panel 1 and the lower panel 2, and grooves 58 are provided on the upper sides of the middle panel 3 and the lower panel 2.

[0043] like Figure 1 As shown, a method for preparing plywood with strong crack resistance comprises the following steps: Step 1: Cut the upper panel 1, the middle panel 3 and the lower panel 2 into preset sizes, and polish the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 34°C for 120 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 120°C until its moisture content reaches 18%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 160°C until the moisture content reaches 6%. Step 5: Move the dried wood veneer to the glue coating assembly by using the transmission assembly, and use the glue coating mechanism to apply phenolic resin glue on the upper surfaces of the middle board 3 and the lower panel 2 at the same time, and use the smoothing assembly to smooth the phenolic resin glue during the gluing; Step 6. After the gluing is completed, use the transmission component to move the wood veneer to the hot pressing mechanism, and use the clamping component to place the lower panel 2 on the lower hot pressing plate 18, and place the upper panel 1 and the middle panel 3 on the two glass fiber meshes 4 respectively. Then, use the cooperation of the upper hot pressing plate and the lower hot pressing plate 18 to press the three wood veneers and the two glass fiber meshes 4. At the same time, cut the edges of the plywood, the overflow glue and the glass fiber mesh 4 to obtain a plywood with neat and smooth edges.

[0044] Preferably, in step five, the amount of glue applied on the middle panel 3 and the lower panel 2 is 360 m2.

[0045] Preferably, the hot pressing temperature in step six is ​​115° C. and the pressing time is 50 min.

[0046] The devices used in this embodiment are all available on the market. Example

[0047] like Figure 3 As shown, a plywood with strong crack resistance includes an upper panel 1, a lower panel 2, a middle panel 3 and two glass fiber meshes 4, one of the glass fiber meshes 4 is located between the upper panel 1 and the middle panel 3, and the other glass fiber mesh 4 is located between the lower panel 2 and the middle panel 3. The wood fibers of the upper panel 1 and the lower panel 2 are in the same direction, the wood fibers of the middle panel 3 are oriented perpendicular to the wood fibers of the upper panel 1 and the lower panel 2, the thickness of the middle panel 3 is the sum of the thickness of the upper panel 1 and the lower panel 2, and grooves 58 are provided on the upper sides of the middle panel 3 and the lower panel 2.

[0048] By adopting the above structure, the crack resistance of the plywood can be enhanced, and the groove 58 can prevent glue from overflowing.

[0049] like Figure 1 As shown, a method for preparing plywood with strong crack resistance comprises the following steps: Step 1: Cut the upper panel 1, the middle panel 3 and the lower panel 2 into preset sizes, and polish the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 34°C for 120 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 120°C until its moisture content reaches 18%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 160°C until the moisture content reaches 6%. Step 5: Move the dried wood veneer to the glue coating assembly by using the transmission assembly, and use the glue coating mechanism to apply phenolic resin glue on the upper surfaces of the middle board 3 and the lower panel 2 at the same time, and use the smoothing assembly to smooth the phenolic resin glue during the gluing; Step 6. After the gluing is completed, use the transmission component to move the wood veneer to the hot pressing mechanism, and use the clamping component to place the lower panel 2 on the lower hot pressing plate 18, and place the upper panel 1 and the middle panel 3 on the two glass fiber meshes 4 respectively. Then, use the cooperation of the upper hot pressing plate and the lower hot pressing plate 18 to press the three wood veneers and the two glass fiber meshes 4. At the same time, cut the edges of the plywood, the overflow glue and the glass fiber mesh 4 to obtain a plywood with neat and smooth edges.

[0050] Preferably, in step five, the amount of glue applied on the middle panel 3 and the lower panel 2 is 360 m2.

[0051] Preferably, the hot pressing temperature in step six is ​​115° C. and the pressing time is 50 min.

[0052] Preferably, Figure 3-11As shown, the device used in steps 2 to 6 is an integrated preparation device, which includes a base 5, a clamping assembly and an upper hot pressing plate, a first support column 6 and two second support columns 7 are fixedly connected to the base 5, a support beam 8 is fixedly connected between the two second support columns 7, a transmission assembly is arranged between the support beam 8 and the first support column 6, a moving block 9 is connected to the transmission assembly, two first cylinders 10 are fixedly connected to the lower side of the moving block 9, the telescopic ends of the two first cylinders 10 are connected to the clamping assembly, a soaking assembly and a gluing assembly are arranged on the base 5, a hot pressing seat 11, four first support rods and four second support rods 13 are fixedly connected to the base 5, two first support rods 12 and two second support rods 13 are located on the left side of the hot pressing seat 11, and the other two first support rods 12 and two second support rods 13 are located on the hot pressing seat 11. On the right side of the press seat 11, the height of the first support rod 12 is higher than the second support rod 13, a first material release roller 14 is rotatably connected between the two first support rods 12 on the left side of the hot press seat 11, a second material release roller 15 is rotatably connected between the two second support rods 13 on the left side of the hot press seat 11, a first coiling roller 16 is rotatably connected between the two first support rods 12 on the right side of the hot press seat 11, a second coiling roller 17 is rotatably connected between the two second support rods 13 on the right side of the hot press seat 11, a glass fiber mesh 4 is wound between the first coiling roller 16 and the first material release roller 14 and between the second coiling roller 17 and the second material release roller 15, a lower hot press plate 18 is fixedly connected to the hot press seat 11, a collecting trough 19 is provided on the hot press seat 11, two second cylinders 20 are fixedly connected to the lower side of the support beam 8, and the telescopic ends of the two second cylinders 20 are fixedly connected to the upper hot press plate.

[0053] With the above structure, when working, the upper panel 1, the middle panel 3 and the lower panel 2 in step one are clamped by the clamping assembly, and then the moving block 9 is driven to move to the top of the soaking assembly by the transmission assembly, and the two first cylinders 10 are started. The telescopic ends of the two first cylinders 10 jointly drive the clamping assembly and the three wooden boards to move into the soaking assembly, so as to soak the upper panel 1, the middle panel 3 and the lower panel 2, and then the clamping assembly and the wooden boards are lifted out of the soaking assembly by the first cylinders 10, and then the wooden boards are driven to move to the gluing assembly by the transmission assembly, and the wooden boards are driven to move to the gluing assembly by the transmission assembly and the first cylinders 10 for gluing, and then the transmission assembly is used to transfer the wooden boards to the glue coating assembly. The cooperation of the first cylinder 10 and the first pneumatic cylinder 11 moves the three wooden boards, so that one layer of glass fiber mesh 4 is located between the upper panel 1 and the middle panel 3, and the other layer of glass fiber mesh 4 is located between the middle panel 3 and the lower panel 2. Subsequently, the upper panel 1 is placed on the upper glass fiber mesh 4, the middle panel 3 is placed on the lower glass fiber mesh 4, and the lower panel 2 is placed on the lower hot pressing plate 18 through the clamping assembly. Subsequently, the clamping assembly is removed through the transmission assembly, and the second cylinder 20 is started. The telescopic end of the second cylinder 20 drives the upper hot pressing plate to move downward, thereby cutting and pressing the three wooden boards and the two glass fiber meshes 4, so as to facilitate the preparation of plywood with neat edges and good crack resistance.

[0054] Preferably, the transmission component includes a sliding rod 21 and a screw rod 22, the sliding rod 21 is fixedly connected between the first support column 6 and the support beam 8, a third motor 23 is fixedly connected to the first support column 6, the output shaft of the third motor 23 passes through the first support column 6 and is fixedly connected to the screw rod 22, the other end of the screw rod 22 is rotationally connected to the support beam 8, a slider 24 is slidably connected to the sliding rod 21, the lower side of the slider 24 is fixedly connected to the moving block 9, and the moving block 9 is threadedly connected to the screw 22.

[0055] With the above structure, the third motor 23 is started, and the output shaft of the third motor 23 drives the screw 22 to rotate, and through the threaded connection with the moving block 9, the moving block 9 is driven to move.

[0056] Preferably, the clamping assembly includes a mounting seat 25, the mounting seat 25 is fixedly connected to the telescopic ends of the two first cylinders 10, the lower end of the mounting seat 25 is fixedly connected to a driving box 26, three double-thread screws 27 are rotatably connected in the driving box 26, the left and right half threads of the three double-thread screws 27 are opposite, the middle parts of the three double-thread screws 27 are fixedly connected to a first gear 28, three motor seats 29 are fixedly connected in the driving box, the three motor seats 29 are respectively located below the three double-thread screws 27, the three motor seats 29 are fixedly connected to the first motors 30, and the output shafts of the three first motors 30 are fixedly connected to the second gear 3 1, the three second gears 31 are respectively meshed with the three first gears 28, the three double-thread screws 27 are all threadedly connected with two threaded blocks 32, the two threaded blocks 32 are respectively located at the left and right parts of the double-thread screw 27, the six threaded blocks 32 are all fixedly connected with a clamping box 34 through a connecting column 33, the lower sides of the two clamping boxes 34 located at the top are fixedly connected with a supporting plate 53, an inclined plate is fixed on the supporting plate 53, two hot air blowers 54 are fixedly connected in the driving box 26, the two hot air blowers 54 are fixedly connected with an air outlet pipe 55, the other ends of the two air outlet pipes 55 extend out of the driving box 26 from one side of the clamping box 34 and are provided with a valve.

[0057] With the above structure, when clamping, the wooden board is placed on the clamping box 34. After the soaking is completed and the wood is lifted out of the liquid, the valve is opened, and then the hot air blower 54 is turned on. The hot air blower 54 performs hot air drying on the three wooden boards. Before pressing the wooden boards, the three wooden boards and the clamping box 34 are moved to the bottom of the upper hot pressing plate through the transmission component, and the two supporting plates are moved to the bottom of the two layers of glass fiber mesh 4 respectively. When pressing, as the upper hot pressing plate descends, the top first motor 30, the middle first motor 30 and the bottom first motor 30 are started in sequence. The three second gears 31 are driven to rotate by the three first motors 30, and the three second gears 31 are driven to rotate by the three double-thread screws 27 through the three first gears 28. The three double-thread screws 27 drive the two threaded blocks 32 connected thereto to move to both sides, thereby driving the three clamping boxes 34 to move to both sides from top to bottom in sequence, so as to release the clamping of the upper panel 1, the middle panel 3 and the lower panel 2 as the upper hot pressing plate descends, so as to facilitate the accurate falling of the three wooden boards and avoid the displacement of the positions of the wooden boards.

[0058] Preferably, the glue coating assembly includes a glue coating box 36, two transmission boxes 37 are fixedly connected to the left side of the glue coating box 36, a glue storage box 38 is fixedly connected to the right side of the glue coating box 36, and two connecting pipes 40 are fixedly connected to the glue storage box 38 near the side of the glue coating box 36, and the two connecting pipes 40 are slidably connected with a glue inlet pipe 41, and the other ends of the two glue inlet pipes 41 are connected to a glue delivery pipe 42, and a plurality of nozzles 43 are arranged on the lower side of the two glue delivery pipes 42, and the two glue delivery pipes 42 are fixedly connected to a rubber sleeve 44 at one end near the connecting pipe 40, and the other ends of the two rubber sleeves 44 are respectively fixedly connected to the two connecting pipes 40, and the lower sides of the two glue delivery pipes 42 are fixedly connected to a smoothing assembly.

[0059] With the above structure, when working, the middle board 3 and the lower panel 2 are moved to the bottom of the two glue delivery pipes 42 respectively through the cooperation of the transmission component and the first cylinder 10, and the wooden board is moved to the inside of the glue coating box 36 through the transmission component. At the same time, the nozzle 43 is started to spray glue on the upper surface of the middle board 3 and the lower panel 2, and then the glue is smoothed by the smoothing component, so that the fit between the board and the glass fiber mesh 4 is more comprehensive and firm.

[0060] Preferably, the smoothing assembly includes a second horizontal plate 45, on which a plurality of smoothing blocks 46 are evenly distributed, a first connecting rod 47 is fixedly connected to the left end of the rubber delivery hose 42, second motors 48 are fixedly connected to the two transmission boxes 37, and the output shafts of the two second motors 48 are fixedly connected to turntables 49, and the two turntables 49 are rotatably connected to second connecting rods 50, and the two second connecting rods 50 are rotatably connected to the two first connecting rods 47 respectively.

[0061] With the above structure, when smoothing, the first cylinder 10 drives the clamping assembly to rise until the plate contacts the second horizontal plate 45, and then the plate is moved outward through the transmission assembly. At the same time, the two second motors 48 are started, and the output shafts of the two second motors 48 respectively drive the two turntables 49 to rotate. The two turntables 49 respectively drive the glue delivery pipe 42 to move left and right through the two first connecting rods 47 and the two second connecting rods 50. The glue delivery pipe 42 drives the second horizontal plate 45 and the smoothing block 46 to move left and right, thereby smoothing the glue.

[0062] Preferably, the upper hot press plate includes a cutting box 51, in which an upper pressing plate 52 is slidably connected, a plurality of springs 39 are fixedly connected to the upper end of the upper pressing plate 52, and the other ends of the plurality of springs 39 are fixedly connected to the cutting box 51, a clamping block is fixedly connected to the cutting box, the lower edge of the cutting box 51 is a wavy blade, a cutter 56 is fixedly connected to the side of the cutting box, and an inclined plate 57 is fixedly connected to the inner periphery of the cutter 56.

[0063] With the above structure, during pressing, the output end of the second cylinder 20 drives the cutting box 51 to move downward. During the movement, the cutter 56 first contacts the first layer of glass fiber mesh 4. After cutting the first layer of glass fiber mesh 4, the cutting box 51 is driven upward by the second cylinder 20, and then the upper panel 1 and the first layer of glass fiber mesh 4 are lowered and dropped on the middle panel 3 through the clamping assembly. Then the second cylinder 20 drives the cutting box 51 to descend and cut the second layer of glass fiber mesh 4. Then the cutting box 51 rises again, and the middle panel 3 and the second layer of glass fiber mesh 4 are lowered and dropped on the lower panel 2 through the clamping assembly. At the same time, the upper pressing plate 52 contacts the upper panel 1, and then the cutting box 51 continues to descend to cut the edge of the plate. When the upper pressing plate 52 moves to contact the block, the cutting box drives the upper pressing plate 52 to descend together, and cooperates with the lower hot pressing plate 18 to press the three plates and the two glass fiber meshes 4 together. The wavy line blade can increase the pressure at the contact point for easy cutting. Example

[0064] like Figure 3 As shown, a plywood with strong crack resistance includes an upper panel 1, a lower panel 2, a middle panel 3 and two glass fiber meshes 4, one of the glass fiber meshes 4 is located between the upper panel 1 and the middle panel 3, and the other glass fiber mesh 4 is located between the lower panel 2 and the middle panel 3. The wood fibers of the upper panel 1 and the lower panel 2 are in the same direction, the wood fibers of the middle panel 3 are oriented perpendicular to the wood fibers of the upper panel 1 and the lower panel 2, the thickness of the middle panel 3 is the sum of the thickness of the upper panel 1 and the lower panel 2, and grooves 58 are provided on the upper sides of the middle panel 3 and the lower panel 2.

[0065] By adopting the above structure, the crack resistance of the plywood can be enhanced, and the groove 58 can prevent glue from overflowing.

[0066] like Figure 1 As shown, a method for preparing plywood with strong crack resistance comprises the following steps: Step 1: Cut the upper panel 1, the middle panel 3 and the lower panel 2 into preset sizes, and polish the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 25°C for 150 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 100°C until its moisture content reaches 20%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 140°C until the moisture content reaches 8%. Step 5: Move the dried wood veneer to the glue coating assembly by using the transmission assembly, and use the glue coating mechanism to apply phenolic resin glue on the upper surfaces of the middle board 3 and the lower panel 2 at the same time, and use the smoothing assembly to smooth the phenolic resin glue during the gluing; Step 6. After the gluing is completed, use the transmission component to move the wood veneer to the hot pressing mechanism, and use the clamping component to place the lower panel 2 on the lower hot pressing plate 18, and place the upper panel 1 and the middle panel 3 on the two glass fiber meshes 4 respectively. Then, use the cooperation of the upper hot pressing plate and the lower hot pressing plate 18 to press the three wood veneers and the two glass fiber meshes 4. At the same time, cut the edges of the plywood, the overflow glue and the glass fiber mesh 4 to obtain a plywood with neat and smooth edges.

[0067] Preferably, in step five, the amount of glue applied on the middle panel 3 and the lower panel 2 is 330 m2.

[0068] Preferably, the hot pressing temperature in step six is ​​120° C. and the pressing time is 40 min.

[0069] The preparation equipment used in the method for preparing plywood with strong crack resistance in this embodiment is the same as the equipment in the second embodiment, and the difference lies in the different processing conditions in the process. Example

[0070] like Figure 3 As shown, a plywood with strong crack resistance includes an upper panel 1, a lower panel 2, a middle panel 3 and two glass fiber meshes 4, one of the glass fiber meshes 4 is located between the upper panel 1 and the middle panel 3, and the other glass fiber mesh 4 is located between the lower panel 2 and the middle panel 3. The wood fibers of the upper panel 1 and the lower panel 2 are in the same direction, the wood fibers of the middle panel 3 are oriented perpendicular to the wood fibers of the upper panel 1 and the lower panel 2, the thickness of the middle panel 3 is the sum of the thickness of the upper panel 1 and the lower panel 2, and grooves 58 are provided on the upper sides of the middle panel 3 and the lower panel 2.

[0071] By adopting the above structure, the crack resistance of the plywood can be enhanced, and the groove 58 can prevent glue from overflowing.

[0072] like Figure 1 As shown, a method for preparing plywood with strong crack resistance comprises the following steps: Step 1: Cut the upper panel 1, the middle panel 3 and the lower panel 2 into preset sizes, and polish the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 40°C for 100 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 140°C until its moisture content reaches 15%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 180°C until its moisture content reaches 5%. Step 5: Move the dried wood veneer to the glue coating assembly by using the transmission assembly, and use the glue coating mechanism to apply phenolic resin glue on the upper surfaces of the middle board 3 and the lower panel 2 at the same time, and use the smoothing assembly to smooth the phenolic resin glue during the gluing; Step 6. After the gluing is completed, use the transmission component to move the wood veneer to the hot pressing mechanism, and use the clamping component to place the lower panel 2 on the lower hot pressing plate 18, and place the upper panel 1 and the middle panel 3 on the two glass fiber meshes 4 respectively. Then, use the cooperation of the upper hot pressing plate and the lower hot pressing plate 18 to press the three wood veneers and the two glass fiber meshes 4. At the same time, cut the edges of the plywood, the overflow glue and the glass fiber mesh 4 to obtain a plywood with neat and smooth edges.

[0073] Preferably, in step five, the amount of glue applied on the middle panel 3 and the lower panel 2 is 380 m2.

[0074] Preferably, the hot pressing temperature in step six is ​​110° C. and the pressing time is 60 min.

[0075] The preparation equipment used in the method for preparing plywood with strong crack resistance in this embodiment is the same as the equipment in the second embodiment, and the difference lies in the different processing conditions in the process.

[0076] Experimental example The plywood with strong crack resistance prepared in Examples 1-4 was subjected to comparative experiments: the comparative standards are: elastic modulus of the plywood with strong crack resistance; static bending strength; wet strength; formaldehyde release rate; peeling adhesion data at 26°C are more intuitive. The experimental table is as follows (Table 1):

[0077] According to the experimental data in Table 1 above, it can be seen that the preparation equipment of Example 1 and Example 2 is different only in step 2 to step 6. The elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance prepared in Example 2 are higher than the elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance prepared in Example 1. Therefore, the use of the plywood processing equipment in the present invention can comprehensively improve the elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance.

[0078] Compared with Example 2, Example 3 and Example 4 only have different process conditions such as processing temperature and time, and the equipment used in the production steps are the same. The elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance prepared in Example 3 and Example 4 are lower than the elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance prepared in Example 2. It can be seen that different process conditions such as processing temperature and time will also affect the elastic modulus, static bending strength, wet strength and peeling adhesion of the plywood with strong crack resistance.

[0079] The method for preparing the plywood with strong crack resistance of the present invention is simple to operate and easy to implement. It not only has good crack resistance, but also has good linkage effect between preparation equipment, and can realize process-based processing of plywood, which not only improves processing efficiency but also reduces processing cost. Moreover, when hot pressing and forming are performed, the edge of the plywood can be cut at the same time, so as to obtain a plywood with smooth and neat edges, which reduces the preparation steps and can improve the adhesion of the plywood.

[0080] By using the plywood processing equipment of the present invention, the linkage operation of the devices is realized, the cost of the equipment is reduced, and the processing quality of the plywood is improved. The upper hot pressing plate is used to dry the base material and hot-press the plywood, which reduces the cost of the equipment. The plywood and wood veneer with strong crack resistance can be glued and hot-pressed at the same time, which ensures the bonding force between the plywoods and improves the processing quality of the plywood.

[0081] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A plywood with strong crack resistance, comprising an upper panel (1), a lower panel (2), a middle panel (3) and two glass fiber meshes (4), characterized in that: One of the glass fiber meshes (4) is located between the upper panel (1) and the middle panel (3), and the other glass fiber mesh (4) is located between the lower panel (2) and the middle panel (3). The wood fibers of the upper panel (1) and the lower panel (2) are oriented in the same direction. The wood fibers of the middle panel (3) are oriented perpendicular to the wood fibers of the upper panel (1) and the lower panel (2). The thickness of the middle panel (3) is the sum of the thicknesses of the upper panel (1) and the lower panel (2). The upper sides of the middle panel (3) and the lower panel (2) are both provided with grooves (58).

2. A method for preparing the plywood with strong crack resistance according to claim 1, characterized in that: The following steps are involved: Step 1: Cut the upper panel (1), the middle panel (3) and the lower panel (2) into preset sizes, and grind the surface of the template to obtain three wooden boards with smooth and clean surfaces; Step 2: Immerse the treated wood veneer in an insect repellent solution at a temperature of 25-40°C for 100-150 minutes; Step 3: Dry the soaked wood veneer at a drying temperature of 100-140°C until its moisture content reaches 15-20%; Step 4: Put the dried wood veneer into clean water for cleaning. After cleaning the surface, dry it again at a drying temperature of 140-180°C until the moisture content reaches 5-8%; Step 5: Move the dried wood veneer to the gluing assembly by using the transmission assembly, apply phenolic resin glue to the upper surfaces of the middle board (3) and the lower panel (2) by using the gluing mechanism, and smooth the phenolic resin glue by using the smoothing assembly during the gluing process; Step 6: After the gluing is completed, the wood veneer is moved to the hot pressing mechanism by using the transmission component, and the lower panel (2) is placed on the lower hot pressing plate (18) by using the clamping component, and the upper panel (1) and the middle panel (3) are placed on the two glass fiber meshes (4) respectively. Then, the three wood veneers and the two glass fiber meshes (4) are pressed together by using the cooperation of the upper hot pressing plate and the lower hot pressing plate (18), and the edges of the plywood, the overflow glue and the glass fiber mesh (4) are cut at the same time to obtain a plywood with neat and smooth edges.

3. The method for preparing a plywood with strong crack resistance according to claim 2, characterized in that: In step 5, the amount of glue applied on the middle panel (3) and the lower panel (2) is 330-380 g / m2.

4. The method for preparing a plywood with strong crack resistance according to claim 3, characterized in that: The temperature of hot pressing in step six is ​​110-120° C., and the pressing time is 40-60 min.

5. The method for preparing a plywood with strong crack resistance according to claim 2, characterized in that: The device used in steps 2 to 6 is an integrated preparation device, comprising a base (5), a clamping assembly and an upper hot pressing plate, wherein a first support column (6) and two second support columns (7) are fixedly connected to the base (5), a support beam (8) is fixedly connected between the two second support columns (7), a transmission assembly is arranged between the support beam (8) and the first support column (6), a moving block (9) is connected to the transmission assembly, two first cylinders (10) are fixedly connected to the lower side of the moving block (9), and the telescopic ends of the two first cylinders (10) are both connected to the clamping assembly, a soaking assembly and a gluing assembly are arranged on the base (5), and a hot pressing seat (11), four first support rods (12) and four second support rods (13) are fixedly connected to the base (5), wherein the two first support rods (12) and the two second support rods (13) are located on the left side of the hot pressing seat (11), and the other two first support rods (12) and the two second support rods (13) are located on the left side of the hot pressing seat (11), and the other two first support rods (12) and the two second support rods (13) are located on the right side of the hot pressing seat (11). ), the height of the first support rod (12) is higher than that of the second support rod (13), a first material discharging roller (14) is rotatably connected between the two first support rods (12) on the left side of the hot pressing seat (11), a second material discharging roller (15) is rotatably connected between the two second support rods (13) on the left side of the hot pressing seat (11), a first material coiling roller (16) is rotatably connected between the two first support rods (12) on the right side of the hot pressing seat (11), and the two second support rods (13) on the right side of the hot pressing seat (11) are A second coiling roller (17) is rotatably connected between the first coiling roller (16) and the first material discharging roller (14), and a glass fiber mesh (4) is wound between the second coiling roller (17) and the second material discharging roller (15). A lower hot pressing plate (18) is fixedly connected to the hot pressing seat (11). A collecting trough (19) is provided on the hot pressing seat (11). Two second cylinders (20) are fixedly connected to the lower side of the support beam (8), and the telescopic ends of the two second cylinders (20) are fixedly connected to the upper hot pressing plate.

6. The method for preparing a plywood with strong crack resistance according to claim 5, characterized in that: The transmission assembly comprises a sliding rod (21) and a screw rod (22); the sliding rod (21) is fixedly connected between the first support column (6) and the support beam (8); a third motor (23) is fixedly connected to the first support column (6); an output shaft of the third motor (23) passes through the first support column (6) and is fixedly connected to the screw rod (22); the other end of the screw rod (22) is rotationally connected to the support beam (8); a slider (24) is slidably connected to the sliding rod (21); the lower side of the slider (24) is fixedly connected to the moving block (9); and the moving block (9) is threadedly connected to the screw rod (22).

7. The method for preparing a plywood with strong crack resistance according to claim 6, characterized in that: The clamping assembly comprises a mounting seat (25), the mounting seat (25) being fixedly connected to the telescopic ends of the two first cylinders (10), the lower end of the mounting seat (25) being fixedly connected to a driving box (26), three double-thread screws (27) being rotatably connected in the driving box (26), the left and right half threads of the three double-thread screws (27) being opposite, the middle parts of the three double-thread screws (27) being fixedly connected to a first gear (28), three motor seats (29) being fixedly connected in the driving box, the three motor seats (29) being respectively located below the three double-thread screws (27), the three motor seats (29) being fixedly connected to a first motor (30), the output shafts of the three first motors (30) being fixedly connected to a second gear (31), and the three The second gear (31) is meshed with the three first gears (28) respectively. The three double-thread screws (27) are each threadedly connected to two threaded blocks (32). The two threaded blocks (32) are respectively located at the left and right parts of the double-thread screw (27). The six threaded blocks (32) are each fixedly connected to a clamping box (34) via a connecting column (33). The lower sides of the two clamping boxes (34) located at the top are fixedly connected to a supporting plate (53). An inclined plate is fixed to the supporting plate (53). Two hot air blowers (54) are fixedly connected to the driving box (26). The two hot air blowers (54) are each fixedly connected to an air outlet pipe (55). The other ends of the two air outlet pipes (55) extend out of the driving box (26) from one side of the clamping box (34) and are provided with a valve.

8. The method for preparing a plywood with strong crack resistance according to claim 7, characterized in that: The glue coating assembly comprises a glue coating box (36), the left side of the glue coating box (36) is fixedly connected to two transmission boxes (37), the right side of the glue coating box (36) is fixedly connected to a glue storage box (38), the glue storage box (38) is fixedly connected to a side close to the glue coating box (36) with two connecting pipes (40), the two connecting pipes (40) are slidably connected with a glue inlet pipe (41), the other ends of the two glue inlet pipes (41) are connected to a glue delivery pipe (42), the lower sides of the two glue delivery pipes (42) are provided with a plurality of nozzles (43), the ends of the two glue delivery pipes (42) close to the connecting pipes (40) are fixedly connected to a rubber sleeve (44), the other ends of the two rubber sleeves (44) are respectively fixedly connected to the two connecting pipes (40), and the lower sides of the two glue delivery pipes (42) are fixedly connected to a smoothing assembly.

9. The method for preparing a plywood with strong crack resistance according to claim 8, characterized in that: The smoothing assembly comprises a second horizontal plate (45), a plurality of smoothing blocks (46) are evenly distributed on the second horizontal plate (45), a first connecting rod (47) is fixedly connected to the left end of the rubber delivery hose (42), a second motor (48) is fixedly connected to each of the two transmission boxes (37), a rotating disk (49) is fixedly connected to the output shafts of the two second motors (48), a second connecting rod (50) is rotatably connected to each of the two rotating disks (49), and the two second connecting rods (50) are rotatably connected to the two first connecting rods (47) respectively.

10. The method for preparing a plywood with strong crack resistance according to claim 9, characterized in that: The upper hot pressing plate comprises a cutting box (51), an upper pressing plate (52) is slidably connected inside the cutting box (51), a plurality of springs (39) are fixedly connected to the upper end of the upper pressing plate (52), the other ends of the plurality of springs (39) are fixedly connected to the cutting box (51), the lower edge of the cutting box (51) is a wavy blade, a cutting knife (56) is fixedly connected to the side of the cutting box, and an inclined plate (57) is fixedly connected to the inner periphery of the cutting knife (56).

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