Method and apparatus for fiber softening and anti-curling

Abstract

The present application relates to a kind of fiber softening anti-curling method and its device, comprising the following steps: (1) by clamping mechanism, the sheet wood board that rotary cutting machine is cut is forwarded;(2) in the end of clamping mechanism, the process of sheet wood board output is beaten to the less one side of the back crack of sheet wood board, so that the wood fiber of the less one side of the back crack of sheet wood board is beaten soft, release the tension of the less one side of the back crack of sheet wood board;(3) after beating, sheet wood board output carries out next step process.The method and device help to prevent the curling of the sheet wood board that is cut.

Description

Technical Field

[0001] This invention relates to a method and apparatus for softening and preventing fiber curling. Background Technology

[0002] In the production of plywood, veneer, and other engineered wood products, a rotary cutter is typically used to process wood segments of a certain length and diameter into continuous veneer strips (sheet boards).

[0003] When a veneer lathe blades veneer wood into planks, back cracks are created at the blade edge. When the diameter of the wood is small, due to the positive curvature of the wood, there are more back cracks on the inner side of the plank after it is cut, and fewer back cracks on the outer side. This results in greater tension, which pulls the plank outward, making the cut planks flatter.

[0004] For larger diameter wood (over 50cm), the surface curvature of the wood is smaller and tends to be flat (the larger the diameter of the wood, the flatter the surface). When the blade of the veneer is veneering, there are more back cracks on the inner side of the sheet wood, and the tension is released. There are fewer back cracks on the outer side of the sheet wood, and the tension is greater. Also, since the freshly cut sheet wood tends to be flat, the sheet wood will curl outwards after a certain period of time under the action of the outer tension, resulting in the sheet wood not being flat enough. Summary of the Invention

[0005] The purpose of this invention is to provide a method and apparatus for softening and preventing fiber curling, which helps to prevent the curling of rotary-cut sheet wood.

[0006] The technical solution of the present invention is: a method for softening and preventing fiber curling, comprising the following steps:

[0007] (1) The sheet wood cut by the veneer is conveyed forward by the clamping mechanism;

[0008] (2) At the end of the clamping mechanism, during the output of the sheet wood, the side of the sheet wood with fewer back cracks is struck, so that the wood fibers on the side of the sheet wood with fewer back cracks are softened and the tension on the side of the sheet wood with fewer back cracks is released.

[0009] (3) After being struck, the sheet-like wooden board is output to the next process.

[0010] Furthermore, the side of the sheet-like wooden board with fewer back cracks is struck at intervals along the width direction of the sheet-like wooden board; while striking the side of the sheet-like wooden board with fewer back cracks, the part of the sheet-like wooden board with more back cracks and corresponding to the striking position is scraped along the conveying direction.

[0011] A fiber softening and anti-curling device includes a frame. A clamping mechanism for feeding sheet-like wooden boards is provided on the rear side of the frame. An upper clamping roller and a lower clamping roller are provided on the frame at the output end of the clamping mechanism. Guide strips are spaced apart along the axial direction on the lower clamping roller. The front end of the guide strip has a scraping blade that protrudes upward from the circumference of the lower clamping roller and is used to scrape the bottom surface of the sheet-like wooden board. A pressure roller is provided above the front side of the lower clamping roller, and the distance between the pressure roller and the scraping blade is adjustable. The pressure roller has convex teeth spaced apart along its axial direction, corresponding to the guide strips and evenly distributed along the circumference of the pressure roller.

[0012] Furthermore, both the upper and lower pinch rollers are provided with annular grooves spaced apart along the axial direction, and the annular grooves of the upper and lower pinch rollers correspond one-to-one. The guide strip is arc-shaped and is disposed in the annular groove of the lower pinch roller, and the rear part of the guide strip extends rearward and is fixed to the frame.

[0013] Furthermore, the scraper end is composed of multiple blades arranged sequentially and fixed to the upper front side of the guide bar, with the blade edge protruding upward from the guide bar by 0.5mm~1.5mm; the pressure roller is provided with annular flanges corresponding to the guide bar at intervals along the axial direction, and the protruding teeth are evenly distributed on the annular flanges along the circumferential direction, with the protruding teeth protruding 0.5mm~2mm from the circumferential surface of the annular flange.

[0014] Furthermore, the clamping mechanism includes several upper clamping belt assemblies and lower clamping belt assemblies arranged vertically and vertically. The upper clamping belt assemblies and lower clamping belt assemblies are respectively spaced apart along the axial direction of the corresponding upper clamping roller and lower clamping roller. A clamping channel is formed between the several upper clamping belt assemblies and lower clamping belt assemblies, and the height of the clamping channel gradually decreases along the conveying direction.

[0015] Furthermore, the upper feeding belt assembly includes an upper feeding belt and an upper support bar mounted on the frame. A first tensioning wheel is provided at the rear end of the upper support bar, and a guide wheel is provided on the lower side of the rear end of the upper support bar. The upper feeding belt is sleeved on the upper feeding roller, the first tensioning wheel, and the guide wheel. The lower feeding belt assembly includes a lower feeding belt and a lower support bar mounted on the frame. A second tensioning wheel is provided at the rear end of the lower support bar, and the lower feeding belt is sleeved on the lower feeding roller and the second tensioning wheel.

[0016] Furthermore, the two ends of the pressure roller are rotatably connected to the mounting frame, and the two ends of the mounting frame are rotatably connected to the two ends of the upper pinch roller via connecting plates. The mounting frame is provided with a drive mechanism for driving the pressure roller to rotate, and the frame is provided with a swing mechanism for driving the mounting frame to rotate around the axis of the upper pinch roller.

[0017] Furthermore, the drive mechanism includes a horizontal motor fixed to one end of the mounting frame, and the output end of the horizontal motor is connected to one end of the pressure roller via a first chain transmission mechanism; the swing mechanism includes a pair of pneumatic cylinders, hydraulic cylinders or electric cylinders hinged to both ends of the frame, and the telescopic rods of the pneumatic cylinders, hydraulic cylinders or electric cylinders are hinged to the side ends of the mounting frame.

[0018] Furthermore, the frame is equipped with a power mechanism for driving the upper and lower pinch rollers to rotate. The frame is also equipped with an output mechanism driven by the power mechanism to output the softened sheet wood on the front side of the lower pinch roller. The frame is also equipped with a lifting mechanism to drive the upper pinch roller and the pressure roller to lift upward.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] 1. This method helps prevent the rotary-cut sheet boards from curling, especially the sheet boards cut from the front of larger diameter wood (over 50cm) during the drying process.

[0021] 2. This device uses evenly distributed convex teeth on the pressure roller and guide strips installed at intervals on the lower clamping roller. A scraper is set at the front end of the guide strips. When the sheet wood passes over the scraper, the convex teeth roll the upper surface of the sheet wood, and the scraper scrapes the bottom surface of the sheet wood. This breaks down (softens) the local fibers on the upper surface of the sheet wood, releases the tension on the upper surface of the sheet wood, and helps to make the front sheet wood of larger diameter wood tend to be flat, preventing the front sheet wood of large diameter wood from curling.

[0022] 3. The clamping channel of the device's clamping mechanism gradually narrows along the conveying direction, facilitating the transport of sheet wood. Simultaneously, the distance between the pressure roller and the scraper end is adjustable, allowing for easy adjustment of whether the pressure roller is in use according to cutting requirements, or adjusting the spacing based on the thickness of the sheet wood being cut. Furthermore, the pressure roller and upper clamping roller can be lifted upwards for convenient inspection and maintenance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0024] Figure 2 This is a schematic diagram of the structure of the present invention. Figure 2 ;

[0025] Figure 3 Cross-sectional view of the present invention Figure 1 ;

[0026] Figure 4 Cross-sectional view of the present invention Figure 2 ;

[0027] Figure 5 This is a schematic diagram of the clamping mechanism of the present invention;

[0028] Figure 6 This is a schematic diagram of the cooperation between the upper pinch roller, lower pinch roller, and pressure roller of the present invention. Figure 1 ;

[0029] Figure 7 This is a schematic diagram of the cooperation between the upper pinch roller, lower pinch roller, and pressure roller of the present invention. Figure 2 ;

[0030] Figure 8 This is a cross-sectional view of the upper clamping roller, lower clamping roller, guide strip, and pressure roller of the present invention.

[0031] In the diagram: 1-Frame; 11-Geared motor; 12-Drive gear; 13-Driven gear; 14-Swing frame; 15-Vertical electric cylinder, vertical hydraulic cylinder, or vertical pneumatic cylinder; 16-Adjusting bolt; 2-Clamping mechanism; 21-Upper clamping belt assembly; 211-Upper clamping belt; 212-Upper support bar; 213-First tensioning wheel; 214-Guide wheel; 22-Lower clamping belt assembly; 221-Lower clamping belt; 222-Lower support bar; 223-Second tensioning wheel; 23-Clamping passage. 3-Upper pinch roller 31-Annular groove 4-Lower pinch roller 41-Annular groove 5-Guide strip 51-Scraper end 6-Pressure roller 61-Protruding tooth 62-Annular flange 7-Mounting frame 71-Connecting plate 72-Horizontal motor 73-Cylinder, oil cylinder or electric cylinder 74-Side protruding plate 8-Output mechanism 81-Rotating shaft 82-Second driven sprocket 83-Second driving sprocket 84-Support frame 85-Support plate 86-Third tensioning wheel 87-Conveyor belt. Detailed Implementation

[0032] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0033] A method for softening and preventing fiber curling includes the following steps:

[0034] (1) The sheet wood cut by the veneer is conveyed forward by the clamping mechanism so as to prevent the sheet wood from curling as soon as it is cut.

[0035] (2) At the end of the clamping mechanism, during the output of the sheet wood, the side with fewer back cracks on the sheet wood is struck, and the strikes are performed at intervals along the width of the sheet wood. This softens and loosens the wood fibers on the side with fewer back cracks (similar to massaging the sheet wood to release tension), thus releasing the tension on the side with fewer back cracks. As long as the area struck accounts for more than 40%, it will help to fully release the tension on the side with fewer back cracks. While striking the side with fewer back cracks, the side with more back cracks can be scraped along the width of the sheet wood at the corresponding position using a small blade. The scraping direction is the conveying direction, and the small blade provides support to the sheet wood during the strike.

[0036] (3) After being struck, the sheet-like wooden board is output to the next process.

[0037] refer to Figures 1 to 8

[0038] A fiber softening and anti-curling device includes a frame 1. A clamping mechanism 2 for feeding sheet-like wood panels is provided on the rear side of the frame, which conveys the sheet-like wood panels output from a slicer forward. An upper clamping roller 3 and a lower clamping roller 4 are provided on the frame at the output end of the clamping mechanism to clamp the sheet-like wood panels forward. Guide strips 5 are spaced apart along the axial direction on the lower clamping roller so that the sheet-like wood panels are fed between the upper and lower clamping rollers and then guided forward. The front end of the guide strip has a scraping blade end 51 that protrudes upward from the circumference of the lower clamping roller and is used to scrape the bottom surface of the sheet-like wood panels. A pressure roller 6 is provided above the front side of the lower clamping roller, and the distance between the pressure roller and the scraping blade end can be adjusted. The pressure roller has protruding teeth 61 spaced apart along its axial direction, corresponding to the guide strips and evenly distributed along the circumference of the pressure roller. The rotation of the pressure rollers, using the scraper end to support the sheet wood and scrape its lower surface, simultaneously strikes the upper surface of the sheet wood with convex teeth, releasing the tension on the upper surface and allowing the sheet wood to flatten, thus preventing the front section of the sheet wood cut from larger diameter timber from curling. At the same time, striking the sheet wood also helps loosen the fibers within it, making it easier for the glue to penetrate the sheet wood during subsequent application.

[0039] In this embodiment, to better install the guide strip, both the upper and lower clamping rollers are provided with annular grooves 31 and 41 spaced apart along the axial direction, and the annular grooves of the upper and lower clamping rollers correspond one-to-one, so that the sheet wood can be clamped and fed through the annular structure between two adjacent annular grooves. The guide strip is arc-shaped and is disposed in the annular groove of the lower clamping roller. The rear part of the guide strip extends rearward and is fixed to the frame, while the front part of the guide strip protrudes from the surface of the lower clamping roller to provide support for the sheet wood and facilitate the softening of the fibers of the sheet wood.

[0040] In this embodiment, in order to better scrape the lower surface of the wooden board, the scraping blade is composed of multiple blades arranged sequentially and fixed to the upper front side of the guide strip, and the blade edge protrudes upward from the guide strip by 0.5mm~1.5mm.

[0041] In this embodiment, in order to convey the sheet wood cut by the veneer forward, the clamping mechanism includes several upper clamping belt assemblies 21 and lower clamping belt assemblies 22 arranged vertically and vertically. The upper clamping belt assemblies and lower clamping belt assemblies are respectively spaced apart along the axial direction of the corresponding upper clamping roller and lower clamping roller. A clamping channel 23 is formed between the several upper clamping belt assemblies and lower clamping belt assemblies, and the height of the clamping channel gradually decreases along the conveying direction, so that the sheet wood can better enter the clamping channel and enter between the upper clamping roller and the lower clamping roller.

[0042] In this embodiment, the upper feeding belt assembly includes an upper feeding belt 211 and an upper support bar 212 mounted on the frame. A first tensioning wheel 213 is provided at the rear end of the upper support bar, and a guide wheel 214 is provided on the lower side of the rear end of the upper support bar. The upper feeding belt is sleeved on the upper feeding roller, the first tensioning wheel and the guide wheel. The upper support bar is supported on the upper bottom surface of the upper feeding belt, thereby driving the upper feeding belt to rotate through the upper feeding roller.

[0043] In this embodiment, the lower feeding belt assembly includes a lower feeding belt 221 and a lower support bar 222 mounted on the frame. A second tensioning roller 223 is provided at the rear end of the lower support bar. The lower feeding belt is sleeved on the lower feeding roller and the second tensioning roller. The lower support bar is supported on the upper bottom surface of the lower feeding belt, thereby driving the lower feeding belt to rotate through the lower feeding roller. The upper and lower feeding belt assemblies complete the conveying of the sheet wood.

[0044] In this embodiment, the two ends of the pressure roller are rotatably connected to the mounting frame 7. The two ends of the mounting frame are rotatably connected to the two ends of the upper clamping roller via connecting plates 71. The mounting frame is equipped with a drive mechanism for driving the pressure roller to rotate. The drive mechanism includes a horizontal motor 72 fixed to one end of the mounting frame. The output end of the horizontal motor is connected to one end of the pressure roller via a first chain transmission mechanism 72, thereby driving the pressure roller to rotate. The frame is equipped with a swing mechanism for driving the mounting frame to rotate around the axis of the upper clamping roller. The swing mechanism includes a pair of cylinders, hydraulic cylinders, or electric cylinders 73 hinged to both ends of the frame. The telescopic rods of the cylinders, hydraulic cylinders, or electric cylinders are hinged to the side ends of the mounting frame, thereby adjusting the distance between the pressure roller and the scraper end through the telescopic action of the cylinders, hydraulic cylinders, or electric cylinders, and adjusting the height of the pressure roller as needed, so that the device can be put into use or the subsequent cutting of the wood into sheet-like boards can be done without striking them.

[0045] The aforementioned first chain drive mechanism includes a first driving sprocket located at the output end of a horizontal motor and a first driven sprocket located on the movement of the pressure roller, with a first chain wound between the first driving sprocket and the first driven sprocket.

[0046] In this embodiment, the pressure roller is provided with annular flanges 62 at intervals along the axial direction, corresponding to the guide strips. The protruding teeth are evenly distributed on the annular flanges in the circumferential direction, and the protruding teeth protrude 0.5mm~2mm from the circumferential surface of the annular flanges. The annular flanges correspond to the annular grooves on the upper and lower pinch rollers, so that the annular flanges can extend into the annular grooves to better adjust the distance between the pressure roller and the scraper end.

[0047] In this embodiment, a power mechanism for driving the upper and lower pinch rollers to rotate is installed on the frame. The power mechanism includes a geared motor 11, the output end of which is connected to one end of the lower pinch roller. One end of the lower pinch roller is provided with a drive gear 12, and one end of the upper pinch roller is provided with a driven gear 13 that meshes with the drive gear, thereby realizing synchronous and opposite rotation of the upper and lower pinch rollers.

[0048] In this embodiment, an output mechanism 8, driven by a power mechanism, is provided on the frame in front of the lower pinch roller for outputting softened sheet-like wood boards. The output mechanism includes a rotating shaft 81 rotatably connected to the lower side of the pressure roller. One end of the rotating shaft is connected to one end of the lower pinch roller via a second chain drive mechanism. Specifically, the second chain drive mechanism includes a second driven sprocket 82 fixed to one end of the rotating shaft, a second driving sprocket 83 fixed to one end of the lower pinch roller, and a second chain wound between the second driving sprocket and the second driven sprocket. A plurality of support plates 85, spaced axially along the rotating shaft, are mounted on the rear side of the frame via a support frame 84. The front ends of each support plate are rotatably connected to a third tensioning wheel 86. A conveyor belt 87 is wound between the third tensioning wheel and the rotating shaft, thereby enabling the output of the softened sheet-like wood boards via these conveyor belts.

[0049] In this embodiment, the frame is also equipped with a lifting mechanism to drive the upper pinch roller and pressure roller to rise. The lifting mechanism includes a pair of swing frames 14, the middle part of which is rotatably connected to the end of the upper pinch roller, and the rear part of which is hinged to the frame. Vertical electric cylinders, vertical hydraulic cylinders, or vertical pneumatic cylinders 15 are respectively hinged to the front sides of the frame. The telescopic rods of the vertical electric cylinders, vertical hydraulic cylinders, or vertical pneumatic cylinders are hinged to the front of the swing frames. Thus, the swing frames are lifted by the extension and retraction of the vertical electric cylinders, vertical hydraulic cylinders, or vertical pneumatic cylinders, thereby lifting the upper pinch roller and pressure roller, facilitating inspection and maintenance. In addition, a lever mechanism can be set between the front end of the swing frame and the front part of the frame to allow the swing frame to rotate around the hinge point connected to the frame.

[0050] In this embodiment, a side convex plate 74 is also fixed on the connecting plate, and an adjusting bolt for supporting the bottom surface of the side convex plate is screwed onto the swing frame. A locking nut is screwed onto the adjusting bolt so that the pressure roller can be supported and positioned by adjusting the bolt after the pressure roller is adjusted.

[0051] In this embodiment, the mounting frame is also provided with a baffle that extends from the front side into the annular groove of the pressure roller, so as to reduce the entry of debris into the annular groove of the pressure roller.

[0052] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of fiber softening and anti-curling methods and devices based on the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A method for softening and preventing fiber curling, comprising a fiber softening and preventing fiber curling device, characterized in that, Includes the following steps: (1) The fiber softening and anti-curling device includes a frame, and a clamping mechanism for feeding sheet wood is provided on the rear side of the frame. The sheet wood cut by the veneer is conveyed forward by the clamping mechanism. An upper clamping roller and a lower clamping roller are provided on the frame at the output end of the clamping mechanism. Guide strips are provided axially on the lower clamping roller. The front end of the guide strip has a scraping blade end that protrudes upward from the circumference of the lower clamping roller and is used to scrape the bottom surface of the sheet wood. A pressure roller that can adjust the distance between the pressure roller and the scraping blade end is provided above the front side of the lower clamping roller. The pressure roller is provided axially on the pressure roller with corresponding guide strips and along the circumference of the pressure roller. The roller has evenly distributed convex teeth along its circumference; both the upper and lower pinch rollers have annular grooves spaced apart along the axial direction, and the annular grooves of the upper and lower pinch rollers correspond one-to-one; the guide strip is arc-shaped and is set in the annular groove of the lower pinch roller; the scraper end is composed of multiple blades arranged sequentially and fixed to the upper front side of the guide strip, and the blade edge protrudes upward from the guide strip by 0.5mm~1.5mm; the pressure roller has annular flanges spaced apart along the axial direction corresponding to the guide strip, and the convex teeth are evenly distributed on the annular flanges along the circumference, with the convex teeth protruding 0.5mm~2mm from the circumferential surface of the annular flanges; (2) At the end of the clamping mechanism, during the output of the sheet wood, the side of the sheet wood with fewer back cracks is struck at intervals along the width direction of the sheet wood, so that the wood fibers on the side of the sheet wood with fewer back cracks are softened and the tension on the side of the sheet wood with fewer back cracks is released; while striking the side of the sheet wood with fewer back cracks, the part of the side of the sheet wood with more back cracks and corresponding to the striking position is scraped along the conveying direction. (3) After being struck, the sheet-like wooden board is output to the next process.

2. The fiber softening and anti-curling method according to claim 1, characterized in that, The rear portion of the guide bar extends rearward and is fixed to the frame.

3. The fiber softening and anti-curling method according to claim 1, characterized in that, The clamping mechanism includes several upper clamping belt assemblies and lower clamping belt assemblies arranged vertically and vertically. The upper clamping belt assemblies and lower clamping belt assemblies are respectively spaced apart along the axial direction of the corresponding upper clamping roller and lower clamping roller. A clamping channel is formed between the several upper clamping belt assemblies and lower clamping belt assemblies, and the height of the clamping channel gradually decreases along the conveying direction.

4. The fiber softening and anti-curling method according to claim 3, characterized in that, The upper feeding belt assembly includes an upper feeding belt and an upper support bar mounted on the frame. A first tensioning roller is provided at the rear end of the upper support bar, and a guide wheel is provided at the lower side of the rear end of the upper support bar. The upper feeding belt is sleeved on the upper feeding roller, the first tensioning roller, and the guide wheel. The lower feeding belt assembly includes a lower feeding belt and a lower support bar mounted on the frame. A second tensioning roller is provided at the rear end of the lower support bar, and the lower feeding belt is sleeved on the lower feeding roller and the second tensioning roller.

5. The fiber softening and anti-curling method according to claim 1, characterized in that, The two ends of the pressure roller are rotatably connected to the mounting frame. The two ends of the mounting frame are rotatably connected to the two ends of the upper pinch roller via connecting plates. The mounting frame is equipped with a drive mechanism for driving the pressure roller to rotate. The frame is equipped with a swing mechanism for driving the mounting frame to rotate around the axis of the upper pinch roller.

6. The fiber softening and anti-curling method according to claim 5, characterized in that, The drive mechanism includes a horizontal motor fixed to one end of the mounting frame, and the output end of the horizontal motor is connected to one end of the pressure roller via a first chain transmission mechanism; the swing mechanism includes a pair of cylinders, hydraulic cylinders or electric cylinders hinged to both ends of the frame, and the telescopic rods of the cylinders, hydraulic cylinders or electric cylinders are hinged to the side ends of the mounting frame.

7. The fiber softening and anti-curling method according to claim 1, characterized in that, The frame is equipped with a power mechanism for driving the upper and lower pinch rollers to rotate. On the front side of the lower pinch roller, there is an output mechanism driven by the power mechanism for outputting the softened sheet wood. The frame is also equipped with a lifting mechanism for driving the upper pinch roller and pressure roller to lift upward.

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