CN110027068B - Crack-free bamboo flattening and shaping method and device - Google Patents
Crack-free bamboo flattening and shaping method and device Download PDFInfo
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- CN110027068B CN110027068B CN201910285320.9A CN201910285320A CN110027068B CN 110027068 B CN110027068 B CN 110027068B CN 201910285320 A CN201910285320 A CN 201910285320A CN 110027068 B CN110027068 B CN 110027068B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
- B27J1/00—Mechanical working of cane or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K1/00—Damping wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K1/00—Damping wood
- B27K1/02—Apparatus
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/06—Softening or hardening of wood
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K9/00—Chemical or physical treatment of reed, straw, or similar material
- B27K9/002—Cane, bamboo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Abstract
The invention discloses a crack-free bamboo flattening and shaping method, which comprises the following steps: s01, cutting off the bamboo tube, removing inner joints, outer joints and removing green; s02, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction to obtain arc-shaped bamboo chips; s03, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device; s04, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips; s05, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips; s06, drying the flattened bamboo chips under the pressure; s07, spraying wet on the green surface and the yellow surface of the flattened bamboo chips simultaneously; s08, performing secondary drying. The invention also discloses a crack-free bamboo flattening and shaping device. The crack-free bamboo flattening and shaping method and device provided by the invention realize crack-free flattening and drying shaping of the moso bamboo tube by utilizing the steam single-side softening flattening and circulating drying shaping method, and can solve the defects of low production yield, poor effect and the like of the original bamboo tube.
Description
Technical Field
The invention relates to a crack-free bamboo flattening and shaping method and device, and belongs to the technical field of bamboo flattening.
Background
China is a large country of bamboo planting and bamboo industry, bamboo products are closely related to life of people, and the bamboo products penetrate into aspects of clothing and eating residence of common people. However, bamboo is of a natural thin-wall hollow structure, the outer surface of the bamboo is provided with bamboo green, the inner part of the bamboo is provided with bamboo partitions and bamboo yellow, and the characteristics all bring difficulty to processing of the bamboo. In the current production process of products such as moso bamboo chopping boards, common bamboo floors and bamboo integrated materials, in order to improve the surface attractiveness of the products, reduce the loss of bamboo splitting, reduce the cutting quantity of the inner surface and the outer surface of the moso bamboo, integrally improve the utilization rate and the production efficiency of the bamboo, and need to flatten the moso bamboo. However, the prior art longitudinal flattening requires scoring of the Mao Zhuna surface and the flattened bamboo panel has deeper cracks and a greater amount of gouging. The transverse flattening has the defects of larger notch depth and low material utilization rate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a crack-free bamboo flattening and shaping method and device which can solve the defects of low yield, poor effect and the like of the original production.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a crack-free bamboo timber exhibition and setting device, includes the frame, the frame below sets up down hot-pressing board, set up in the frame and be used for the gliding bracing piece passageway of bracing piece, be provided with the heating on the bracing piece and spout wet device, the heating is with spout wet device on set up and spout wet channel, the gag lever post passageway that is used for the gag lever post upper end to pass is seted up to the bracing piece lower extreme, the lower extreme of gag lever post with down hot-pressing board contacts, be located on the gag lever post bracing piece below cover is equipped with compression spring, be provided with the exhibition board on the heating with spout wet device, upward set up steam and water injection channel on the exhibition board, upward the exhibition board and with the last hot-pressing board contact of hot press, frame upper surface one side is provided with protruding fixed part, the opposite side is provided with the side pressurization movable block, the side pressurization movable block links to each other with cylinder connecting rod device.
The heating and spraying device is in a horizontal cylindrical shape, and an arc-shaped groove for accommodating the heating and spraying device is formed in the upper end of the supporting rod.
A crack-free bamboo flattening and shaping method comprises the following steps:
s01, cutting off the bamboo tube, removing inner joints, outer joints and removing green;
s02, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction to obtain arc-shaped bamboo chips;
s03, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device;
s04, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips;
s05, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips;
s06, drying the flattened bamboo chips under the pressure;
s07, spraying wet on the green surface and the yellow surface of the flattened bamboo chips simultaneously;
s08, performing secondary drying.
In S01, the cut length of the bamboo tube is selected to be within 1200mm, limiting teeth are arranged on a green removing milling cutter shaft in green removing treatment, air pressure of 0.3-0.7 MPa is applied, and the green removing thickness is 0.4-0.7 mm.
S04, the temperature of steam treatment is 150 ℃ and the time is 5-6 min; the heating temperature of the lower part of the arc-shaped bamboo chips is 150 ℃.
In S05, the upper part of the arc-shaped bamboo chip is pressurized by adopting an upper flattening plate, the side part of the arc-shaped bamboo chip is loaded with pressure of 1.5-2.0 kN by adopting a lateral cylinder, and the upper flattening plate moves downwards at a speed of 1-2 mm/min until the arc-shaped bamboo chip is flattened.
In S06, the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to be 110-120 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
In S07, the duration of the spraying is 2-3 min.
In S08, the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to 80-90 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
The invention has the beneficial effects that: the invention provides a crack-free bamboo flattening and shaping method and device, which realize crack-free and nick-free lateral loading stress flattening of moso bamboo flattening by high-temperature softening of the whole bamboo chips and steam softening of the green surfaces of the bamboo chips; by using a cyclic drying and shaping method, the flattened bamboo chips cannot recover, the flatness is good, and the defects of low production yield, poor effect and the like of the original production are overcome; the steam softening energy consumption of the bamboo is lower, and the efficiency is higher.
Drawings
FIG. 1 is a schematic structural view of a crack-free bamboo flattening and shaping device of the present invention.
Reference numerals in the drawings are as follows: the device comprises a 1-arc bamboo chip, a 2-upper flattening plate, a 3-heating and wetting device, a 4-wetting channel, a 5-supporting rod, a 6-lateral pressurizing moving block, a 7-cylinder connecting rod device, an 8-frame, a 9-lower hot pressing plate, a 10-limiting rod, a 11-steam and water spraying channel, a 12-limiting rod channel, a 13-compression spring and a 14-supporting rod channel.
Detailed Description
The present invention is further described with reference to the following examples, which are only for more clearly illustrating the technical solution of the present invention, but are not to be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the crack-free bamboo flattening and shaping device comprises a frame 8, a lower hot pressing plate 9 is arranged below the frame 8, a support rod channel 14 for sliding a support rod 5 is formed in the frame 8, a heating and wetting device 3 is arranged on the support rod 5, a wetting channel 4 is formed in the heating and wetting device 3, the heating and wetting device 3 is in a horizontal lying cylindrical shape, and an arc-shaped groove for accommodating the heating and wetting device 3 is formed in the upper end of the support rod 5.
The gag lever post passageway 12 that is used for gag lever post 10 upper end to pass has been seted up to bracing piece 5 lower extreme, and the lower extreme of gag lever post 10 contacts with lower hot pressing board 9, and the cover that is located bracing piece 5 below is equipped with compression spring 13 on the gag lever post 10, and when bracing piece 5 downward movement, gag lever post 10 upper end enters into gag lever post passageway 12 gradually, and compression spring 13 is compressed simultaneously, and compression spring 13 plays the effect of upwards supporting bracing piece 5. Because the height of the supporting rod 5 is adjustable, the heating and wetting device 3 can be ensured to be in close contact with the lower surface of the arc-shaped bamboo chips 1 all the time, and the heating effect is improved.
The heating and spraying device 3 is provided with an upper flattening plate 2, the upper flattening plate 2 is provided with steam and water spraying channels 11, the upper flattening plate 2 is contacted with an upper hot pressing plate of a hot press, and the hot pressing plate can transfer heat to the upper flattening plate 2. One side of the upper surface of the frame 8 is provided with a convex fixing part, the other side is provided with a lateral pressurizing moving block 6, and the lateral pressurizing moving block 6 is connected with a cylinder connecting rod device 7. The upper surface of the arc-shaped bamboo sheet 1 is contacted with the upper flattening plate 2, the lower surface is contacted with the heating and wetting device 3, one side of the arc-shaped bamboo sheet 1 is contacted with the convex fixing part, and the other side is contacted with the lateral pressurizing moving block 6.
The invention also discloses a crack-free bamboo flattening and shaping method, which comprises the following steps:
firstly, cutting the bamboo tube, wherein the cutting length of the bamboo tube is selected to be within 1200mm, inner joint removal, outer joint removal and green removal treatment are carried out, limiting teeth are arranged on a green removal milling cutter shaft in the green removal treatment, air pressure of 0.3-0.7 MPa, preferably 0.3MPa, and green removal thickness is 0.4-0.7 mm, preferably 0.4mm.
And secondly, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction by using a circular bamboo subdivision device to obtain arc-shaped bamboo chips, wherein the arc-shaped bamboo chips are preferably three-equal subdivision.
And thirdly, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device shown in fig. 1. The arc-shaped bamboo chips 1 are positioned between the upper flattening plate 2 and the heating and wetting device 3, one side of the arc-shaped bamboo chips 1 is contacted with the convex fixing parts, and the other side is contacted with the lateral pressurizing moving blocks 6.
And fourthly, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips, wherein steam and water injection channels 11 formed on the upper steam flattening plate 2 are discharged, the steam treatment temperature is 150 ℃, and the time is 5-6 min, preferably 5min. The lower part of the arc-shaped bamboo chips is heated by the heating and spraying device 3, and the temperature is set to be 150 ℃.
Step five, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips; the upper part of the arc-shaped bamboo chips is pressurized by adopting an upper flattening plate 2, the side part of the arc-shaped bamboo chips 1 is loaded with pressure of 1.5-2.0 kN, preferably 1.5kN by adopting a lateral cylinder, and the upper flattening plate 2 moves downwards at a speed of 1-2 mm/min, preferably 1mm/min until the arc-shaped bamboo chips are flattened.
Step six, drying the flattened bamboo chips under the pressure; the flattened bamboo chips are dried by adopting a mode of heating the upper part and the lower part simultaneously, the upper part is heated by adopting an upper hot pressing plate of a hot press, the lower part is heated by adopting a heating and wetting device 3, the temperature is set to be 110-120 ℃, preferably 110 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
And seventhly, spraying and wetting the green surface and the yellow surface of the flattened bamboo chips simultaneously, wherein the green surface is sprayed and wetted by using the steam and water spraying channels 11 on the steam upper flattening plate 2, the yellow surface is sprayed and wetted by using the heating and wetting channel 4 on the wetting device 3, and the duration of spraying and wetting is 2-3 min.
And step eight, performing secondary drying, wherein the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to be 80-90 ℃, preferably 80 ℃, and the drying is performed until the water content is not higher than 12%.
Example 2
As shown in fig. 1, the crack-free bamboo flattening and shaping device comprises a frame 8, a lower hot pressing plate 9 is arranged below the frame 8, a support rod channel 14 for sliding a support rod 5 is formed in the frame 8, a heating and wetting device 3 is arranged on the support rod 5, a wetting channel 4 is formed in the heating and wetting device 3, the heating and wetting device 3 is in a horizontal lying cylindrical shape, and an arc-shaped groove for accommodating the heating and wetting device 3 is formed in the upper end of the support rod 5.
The gag lever post passageway 12 that is used for gag lever post 10 upper end to pass has been seted up to bracing piece 5 lower extreme, and the lower extreme of gag lever post 10 contacts with lower hot pressing board 9, and the cover that is located bracing piece 5 below is equipped with compression spring 13 on the gag lever post 10, and when bracing piece 5 downward movement, gag lever post 10 upper end enters into gag lever post passageway 12 gradually, and compression spring 13 is compressed simultaneously, and compression spring 13 plays the effect of upwards supporting bracing piece 5. Because the height of the supporting rod 5 is adjustable, the heating and wetting device 3 can be ensured to be in close contact with the lower surface of the arc-shaped bamboo chips 1 all the time, and the heating effect is improved.
The heating and spraying device 3 is provided with an upper flattening plate 2, the upper flattening plate 2 is provided with steam and water spraying channels 11, the upper flattening plate 2 is contacted with an upper hot pressing plate of a hot press, and the hot pressing plate can transfer heat to the upper flattening plate 2. One side of the upper surface of the frame 8 is provided with a convex fixing part, the other side is provided with a lateral pressurizing moving block 6, and the lateral pressurizing moving block 6 is connected with a cylinder connecting rod device 7. The upper surface of the arc-shaped bamboo sheet 1 is contacted with the upper flattening plate 2, the lower surface is contacted with the heating and wetting device 3, one side of the arc-shaped bamboo sheet 1 is contacted with the convex fixing part, and the other side is contacted with the lateral pressurizing moving block 6.
The invention also discloses a crack-free bamboo flattening and shaping method, which comprises the following steps:
firstly, cutting the bamboo tube, wherein the cutting length of the bamboo tube is selected to be within 1200mm, inner joint removal, outer joint removal and green removal treatment are carried out, limiting teeth are arranged on a green removal milling cutter shaft in the green removal treatment, air pressure of 0.3-0.7 MPa, preferably 0.5MPa, and green removal thickness is 0.4-0.7 mm, preferably 0.5mm.
And secondly, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction by using a circular bamboo subdivision device to obtain arc-shaped bamboo chips, wherein the arc-shaped bamboo chips are preferably three-equal subdivision.
And thirdly, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device shown in fig. 1. The arc-shaped bamboo chips 1 are positioned between the upper flattening plate 2 and the heating and wetting device 3, one side of the arc-shaped bamboo chips 1 is contacted with the convex fixing parts, and the other side is contacted with the lateral pressurizing moving blocks 6.
And fourthly, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips, wherein steam and water injection channels 11 formed on the upper steam flattening plate 2 are discharged, the steam treatment temperature is 150 ℃, and the time is 5-6 min, preferably 5.5min. The lower part of the arc-shaped bamboo chips is heated by the heating and spraying device 3, and the temperature is set to be 150 ℃.
Step five, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips; the upper part of the arc-shaped bamboo chips is pressurized by adopting an upper flattening plate 2, the side part of the arc-shaped bamboo chips 1 is loaded with pressure of 1.5-2.0 kN, preferably 1.8kN by adopting a lateral cylinder, and the upper flattening plate 2 moves downwards at a speed of 1-2 mm/min, preferably 2mm/min until the arc-shaped bamboo chips are flattened.
Step six, drying the flattened bamboo chips under the pressure; the upper and lower parts of the flattened bamboo chips are heated simultaneously, the upper part is heated by an upper hot pressing plate of a hot press, the lower part is heated by a heating and spraying device 3, the temperature is set to be 110-120 ℃, preferably 115 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
And seventhly, spraying and wetting the green surface and the yellow surface of the flattened bamboo chips simultaneously, wherein the green surface is sprayed and wetted by using the steam and water spraying channels 11 on the steam upper flattening plate 2, the yellow surface is sprayed and wetted by using the heating and wetting channel 4 on the wetting device 3, and the duration of spraying and wetting is 2-3 min.
And step eight, performing secondary drying, wherein the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to 80-90 ℃, preferably 85 ℃, and the drying is performed until the water content is not higher than 12%.
Example 3
As shown in fig. 1, the crack-free bamboo flattening and shaping device comprises a frame 8, a lower hot pressing plate 9 is arranged below the frame 8, a support rod channel 14 for sliding a support rod 5 is formed in the frame 8, a heating and wetting device 3 is arranged on the support rod 5, a wetting channel 4 is formed in the heating and wetting device 3, the heating and wetting device 3 is in a horizontal lying cylindrical shape, and an arc-shaped groove for accommodating the heating and wetting device 3 is formed in the upper end of the support rod 5.
The gag lever post passageway 12 that is used for gag lever post 10 upper end to pass has been seted up to bracing piece 5 lower extreme, and the lower extreme of gag lever post 10 contacts with lower hot pressing board 9, and the cover that is located bracing piece 5 below is equipped with compression spring 13 on the gag lever post 10, and when bracing piece 5 downward movement, gag lever post 10 upper end enters into gag lever post passageway 12 gradually, and compression spring 13 is compressed simultaneously, and compression spring 13 plays the effect of upwards supporting bracing piece 5. Because the height of the supporting rod 5 is adjustable, the heating and wetting device 3 can be ensured to be in close contact with the lower surface of the arc-shaped bamboo chips 1 all the time, and the heating effect is improved.
The heating and spraying device 3 is provided with an upper flattening plate 2, the upper flattening plate 2 is provided with steam and water spraying channels 11, the upper flattening plate 2 is contacted with an upper hot pressing plate of a hot press, and the hot pressing plate can transfer heat to the upper flattening plate 2. One side of the upper surface of the frame 8 is provided with a convex fixing part, the other side is provided with a lateral pressurizing moving block 6, and the lateral pressurizing moving block 6 is connected with a cylinder connecting rod device 7. The upper surface of the arc-shaped bamboo sheet 1 is contacted with the upper flattening plate 2, the lower surface is contacted with the heating and wetting device 3, one side of the arc-shaped bamboo sheet 1 is contacted with the convex fixing part, and the other side is contacted with the lateral pressurizing moving block 6.
The invention also discloses a crack-free bamboo flattening and shaping method, which comprises the following steps:
firstly, cutting the bamboo tube, wherein the cutting length of the bamboo tube is selected to be within 1200mm, inner joint removal, outer joint removal and green removal treatment are carried out, limiting teeth are arranged on a green removal milling cutter shaft in the green removal treatment, air pressure of 0.3-0.7 MPa, preferably 0.7MPa, and green removal thickness is 0.4-0.7 mm, preferably 0.7mm.
And secondly, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction by using a circular bamboo subdivision device to obtain arc-shaped bamboo chips, wherein the arc-shaped bamboo chips are preferably three-equal subdivision.
And thirdly, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device shown in fig. 1. The arc-shaped bamboo chips 1 are positioned between the upper flattening plate 2 and the heating and wetting device 3, one side of the arc-shaped bamboo chips 1 is contacted with the convex fixing parts, and the other side is contacted with the lateral pressurizing moving blocks 6.
And fourthly, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips, wherein steam and water injection channels 11 formed on the upper steam flattening plate 2 are discharged, the steam treatment temperature is 150 ℃, and the time is 5-6 min, preferably 6min. The lower part of the arc-shaped bamboo chips is heated by the heating and spraying device 3, and the temperature is set to be 150 ℃.
Step five, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips; the upper part of the arc-shaped bamboo chips is pressurized by adopting an upper flattening plate 2, the side part of the arc-shaped bamboo chips 1 is loaded with pressure of 1.5-2.0 kN, preferably 2.0kN by adopting a lateral cylinder, and the upper flattening plate 2 moves downwards at a speed of 1-2 mm/min, preferably 2mm/min until the arc-shaped bamboo chips are flattened.
Step six, drying the flattened bamboo chips under the pressure; the upper and lower parts of the flattened bamboo chips are heated simultaneously, the upper part is heated by an upper hot pressing plate of a hot press, the lower part is heated by a heating and wetting device 3, the temperature is set to be 110-120 ℃, preferably 120 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
And seventhly, spraying and wetting the green surface and the yellow surface of the flattened bamboo chips simultaneously, wherein the green surface is sprayed and wetted by using the steam and water spraying channels 11 on the steam upper flattening plate 2, the yellow surface is sprayed and wetted by using the heating and wetting channel 4 on the wetting device 3, and the duration of spraying and wetting is 2-3 min.
And step eight, performing secondary drying, wherein the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to be 80-90 ℃, preferably 90 ℃, and the drying is performed until the water content is not higher than 12%.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (7)
1. A crack-free bamboo flattening and shaping method is characterized in that: the crack-free bamboo flattening and shaping device is used, the crack-free bamboo flattening and shaping device comprises a frame (8), a lower hot pressing plate (9) is arranged below the frame (8), a supporting rod channel (14) for supporting rod (5) to slide is formed in the frame (8), a heating and spraying device (3) is arranged on the supporting rod (5), a spraying channel (4) is formed in the heating and spraying device (3), a limiting rod channel (12) for allowing the upper end of a limiting rod (10) to penetrate is formed in the lower end of the supporting rod (5), the lower end of the limiting rod (10) is in contact with the lower hot pressing plate (9), a compression spring (13) is sleeved on the limiting rod (10) below the supporting rod (5), an upper flattening plate (2) is arranged on the upper side of the heating and spraying device (3), a steam and water spraying channel (11) is formed in the upper flattening plate (2) and is in contact with an upper hot pressing plate of the hot pressing machine, a pressing block (6) is arranged on one side of the frame (8), and a lateral pressing block (6) is arranged on the other side of the frame, and a lateral pressing block (6) is connected with the lateral pressing device; the heating and spraying device (3) is in a horizontal cylindrical shape, an arc-shaped groove for accommodating the heating and spraying device (3) is formed in the upper end of the supporting rod (5), and the heating and spraying device comprises the following steps:
s01, cutting off the bamboo tube, removing inner joints, outer joints and removing green;
s02, performing three-equal subdivision or four-equal subdivision treatment on the bamboo tube along the longitudinal direction to obtain arc-shaped bamboo chips;
s03, placing the arc-shaped bamboo chips into a crack-free bamboo flattening and shaping device;
s04, performing steam softening treatment on the green surfaces of the arc-shaped bamboo chips;
s05, pressurizing and shaping the arc-shaped bamboo chips to obtain flattened bamboo chips;
s06, drying the flattened bamboo chips under the pressure;
s07, spraying wet on the green surface and the yellow surface of the flattened bamboo chips simultaneously;
s08, performing secondary drying.
2. The crack-free bamboo flattening and sizing method of claim 1, wherein: in S01, the cut length of the bamboo tube is selected to be within 1200mm, limiting teeth are arranged on a green removing milling cutter shaft in a green removing treatment, air pressure of 0.3-0.7 MPa is applied, and the green removing thickness is 0.4-0.7 mm.
3. The crack-free bamboo flattening and sizing method of claim 1, wherein: s04, performing steam treatment at a temperature of 150 ℃ for 5-6 min; the heating temperature of the lower part of the arc-shaped bamboo chips is 150 ℃.
4. The crack-free bamboo flattening and sizing method of claim 1, wherein: in S05, the upper part of the arc-shaped bamboo chip is pressurized by adopting an upper flattening plate, the side part of the arc-shaped bamboo chip is loaded with pressure of 1.5-2.0 kN by adopting a lateral cylinder, and the upper flattening plate moves downwards at a speed of 1-2 mm/min until the arc-shaped bamboo chip is flattened.
5. The crack-free bamboo flattening and sizing method of claim 1, wherein: in S06, the upper and lower surfaces of the flattened bamboo chips are heated simultaneously, the temperature is set to be 110-120 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
6. The crack-free bamboo flattening and sizing method of claim 1, wherein: in S07, the duration of spraying is 2-3 min.
7. The crack-free bamboo flattening and sizing method of claim 1, wherein: in S08, the flattened bamboo chips are dried by adopting a mode of heating the upper surface and the lower surface simultaneously, the temperature is set to 80-90 ℃, and the flattened bamboo chips are dried until the water content is not higher than 12%.
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