CN115179373B - Preparation method of polyurethane plywood - Google Patents

Preparation method of polyurethane plywood Download PDF

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Publication number
CN115179373B
CN115179373B CN202210712174.5A CN202210712174A CN115179373B CN 115179373 B CN115179373 B CN 115179373B CN 202210712174 A CN202210712174 A CN 202210712174A CN 115179373 B CN115179373 B CN 115179373B
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Prior art keywords
polyurethane foam
foam board
plywood
fixed
wood veneer
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CN115179373A (en
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请求不公布姓名
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Lanling County Senguangyuan Wood Industry Co ltd
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Lanling County Senguangyuan Wood Industry Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B27D3/02—Veneer presses; Press plates; Plywood presses with a plurality of press plates, i.e. multi- platen hot presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
    • 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
    • B27K5/04—Combined bleaching or impregnating and drying of wood
    • 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
    • B27K2240/00—Purpose of the treatment
    • B27K2240/20—Removing fungi, molds or insects

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

The invention provides a preparation method of polyurethane plywood, belongs to the technical field of plywood preparation, and solves the technical problems of lack of linkage, low processing efficiency, low adhesive force of plywood and the like of existing processing equipment. The preparation method of the polyurethane plywood comprises the steps of carrying out frosting treatment on the side edges and the surfaces of a polyurethane foam board and a wood veneer, and removing impurities to obtain a smooth and clean polyurethane foam board and a wood veneer; immersing the treated polyurethane foam board and wood veneer into insect-proof liquid for immersing, wherein the immersing temperature is 30-45 ℃, and the immersing time is as follows: 100-150min; drying the soaked polyurethane foam board and the wood veneer at 120-150 ℃ until the water content reaches 15-20%; and (5) placing the dried polyurethane foam board and the wood veneer into clear water for washing. The invention has the advantages of improving the continuity of preparation, reducing the cost, improving the adhesive force of the plywood and improving the quality of the plywood.

Description

Preparation method of polyurethane plywood
Technical Field
The invention belongs to the technical field of plywood preparation, and relates to a plywood, in particular to a preparation method of polyurethane plywood.
Background
Along with the development of society and the gradual improvement of the living standard of people, people pay more attention to the quality and grade of house decoration, so that more and more wood floors are selected, but due to the gradual reduction of world forest resources and the lack of wood raw materials, the wood floors completely cut by wood boards are fewer and fewer, the light of people is gradually turned to the plywood, and the wood boards are formed by gluing crushed aggregates.
Through searching, for example, chinese patent literature discloses a preparation method of a multi-layer plywood
[ application number: 201911151215.2; publication No.: CN 110861170B ]. The plywood is prepared by cutting wood into wood chips, wood particles or wood shavings, drying, soaking the wood chips, wood shavings in insect-proof liquid for a period of time, taking out, naturally airing, soaking the wood chips, wood particles or wood shavings in the insect-proof liquid again, taking out, and airing to obtain a plywood raw material; firstly, paving a raw material of the plywood, then spraying an adhesive, paving a layer of sound insulation material, spraying the adhesive on the surface, paving a layer of raw material of the plywood, and pressurizing to prepare a first-grade plywood; cutting a plurality of arc grooves on two side surfaces of the primary plywood by using metal wires, spraying adhesives on the upper side and the lower side of the primary plywood, paving plywood raw materials, and pressurizing to synthesize the secondary plywood; and (3) repeating the steps for a plurality of times to form the multi-stage plywood, airing, spraying mildew-proof liquid on the synthesized multi-stage plywood, and drying to obtain a plywood finished product. The preparation method of the plywood is simple to operate, the prepared plywood is aldehyde-free, the safety is good, and the wide popularization is facilitated.
The plywood disclosed in the patent is good in environmental protection performance, but when the plywood is prepared, each step is made of independent equipment, the linkage is lacked between the equipment, the processing efficiency is affected, the quality of finished plywood products is reduced, the equipment cost is high, and when gluing and laminating operation is carried out, multiple operations are needed, so that the gluing of the first layer can be carried out for multiple times, and the adhesive force of the plywood can be influenced.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a preparation method of polyurethane plywood, which aims to solve the technical problems that: how to realize improving the continuity of preparation, reducing the cost, improving the adhesive force of the plywood and improving the quality of the plywood.
The aim of the invention can be achieved by the following technical scheme:
the preparation method of the polyurethane plywood comprises the following steps of:
s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer;
s2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 30-45 ℃, and the soaking time is as follows: 100-150min;
S3, drying the soaked polyurethane foam board and the wood veneer at 120-150 ℃ until the water content reaches 15-20%;
s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 140-180 ℃ until the water content reaches 5-9%;
s5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing;
s6, after the smearing is finished, transferring the polyurethane foam board and the wood veneer into a hot pressing mechanism by using a first conveying mechanism, stacking the polyurethane foam board and the wood veneer on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and then pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood.
Preferably, the sizing amount on the wood veneer and the polyurethane foam board in the step S5 is 330-380g/m2.
Preferably, the hot pressing temperature in the step S6 is 110-120 ℃, and the pressing time is 40-60min.
Preferably, after the polyurethane plywood is pressurized, the pressure is maintained for 20-30min, then the pressure is relieved, and the hot pressing pressure required by the pressure maintaining is 1.4-1.8MPa.
Preferably, the equipment adopted in the steps S2-S6 is plywood processing equipment, the plywood processing equipment comprises a base, a soaking box is fixed at the left end of the base, a supporting frame is fixed at the right end of the base, a first conveying mechanism is arranged between the soaking box and the supporting frame, the first conveying mechanism comprises a support column fixedly connected with the upper end of the soaking box, a threaded rod is rotatably connected between the support column and the supporting frame, a rotating motor is fixed on the supporting frame, the output shaft end of the rotating motor is fixedly connected with one end of the threaded rod, a movable seat is in threaded connection with the threaded rod, a hydraulic rod is fixed on the movable seat, a clamping assembly is arranged at the other end of the hydraulic rod, an upper hot pressing plate is arranged on the clamping assembly, a first movable assembly is further arranged on the base, a gluing mechanism is arranged on the movable assembly, the gluing mechanism is arranged between the soaking box and the supporting frame, a hot pressing mechanism is arranged in the supporting frame, and a second conveying mechanism is arranged on the hot pressing mechanism.
By adopting the structure, when in work, the treated polyurethane foam board and the wood veneer are clamped and fixed by the clamping component, and then the clamping component is driven to descend by the hydraulic rod, so that the polyurethane foam board and the wood veneer enter the soaking box, are soaked by the insect-proof liquid, the soaking temperature is 30-45 ℃, and the soaking time is as follows: 100-150min, discharging insect-proof liquid after soaking, heating the inside of a soaking box to 120-150 ℃ by using an upper hot pressing plate, drying a polyurethane foam board and a wood veneer, adding clear water into the soaking box after the water content of the polyurethane foam board and the wood veneer is driven to 15-20%, flushing the polyurethane foam board and the wood veneer by using clear water, heating the inside of the soaking box to 140-180 ℃ by using the upper hot pressing plate again after the surface is flushed completely, leading the water content of the polyurethane foam board and the wood veneer to reach 5-9%, driving a clamping assembly to rise by using a hydraulic rod, leading the polyurethane foam board and the wood veneer to move out of the soaking box, starting a rotary motor, driving a threaded rod to rotate by the rotary motor, leading a movable seat to drive the polyurethane foam board and the wood veneer to move onto a gluing mechanism, then opening the first moving assembly to enable the gluing part of the gluing mechanism to be positioned on the upper sides of the lowest-layer wood veneer and the middle-layer polyurethane foam board respectively, simultaneously smearing polyurethane adhesive on the polyurethane foam board and the wood veneer, simultaneously trowelling the polyurethane adhesive by using the trowelling assembly, after the smearing is finished, driving the moving seat to move by using the rotation of the threaded rod, thereby enabling the polyurethane foam board and the wood veneer to move above the hot pressing mechanism, clamping the front side and the rear side of the polyurethane foam board and the wood veneer by using the second conveying mechanism, loosening the clamping assembly at the moment, then enabling the polyurethane foam board and the wood veneer to be stacked on the hot pressing mechanism by using the second conveying mechanism, simultaneously driving the upper hot pressing board to descend by using the hydraulic rod, hot pressing the polyurethane foam board and the wood veneer by using the cooperation of the upper hot pressing board and the hot pressing mechanism, the polyurethane plywood is obtained, so that the continuity of plywood processing is improved, the flow production of the plywood is realized, the upper hot pressing plate is utilized to realize the drying of a base material and the hot press forming of the plywood, the cost of equipment is reduced, the polyurethane foam board and the wood veneer can be simultaneously glued and hot pressed, the adhesive force between the plywood is ensured, and the quality of the plywood processing is improved.
Preferably, the clamping assembly comprises a sealing plate, the sealing plate is fixedly connected with the telescopic end of the hydraulic rod, the second moving assembly is fixed on the other side of the sealing plate, two vertical plates are arranged on the second moving assembly, three clamping seats are fixed on opposite faces of the two vertical plates, clamping grooves are formed in the clamping seats, a reserved space is formed between the clamping seats and the clamping grooves, and an upper hot pressing plate is arranged on the lower side of the second moving assembly.
By adopting the structure, when the device works, the second moving assembly is utilized to drive the two vertical plates to move reversely, the two vertical plates are sequentially placed on the corresponding clamping seats from top to bottom according to the sequence of the wood single plate, the placing mode is convenient, the gluing mechanism and the hot pressing mechanism are mutually matched, then the second moving assembly is utilized to drive the two vertical plates to move oppositely, the wood single plate and the polyurethane foam plate are fixed, after the fixing is completed, the hydraulic rod drives the sealing plate to descend, the wood single plate and the polyurethane foam plate enter the soaking box, and the sealing plate is arranged to seal the soaking box.
Preferably, the hot pressing mechanism comprises a supporting seat, a lower hot pressing plate is fixed on the supporting seat, a cavity is formed in the supporting seat, a driving motor is fixed on the supporting seat, a bidirectional threaded rod extending into the cavity is fixed at the output shaft end of the driving motor, two movable plates are connected to the bidirectional threaded rod in a threaded manner, the upper ends of the movable plates extend out of the cavity and are connected with the second conveying mechanism, and the lower hot pressing plate is located between the two movable plates.
By adopting the structure, after the clamping assembly moves to the upper part of the hot pressing mechanism, the driving motor is started, the driving motor drives the bidirectional threaded rod to rotate, so that the two moving plates are driven to move in opposite directions, the two moving plates are respectively clamped on the front side and the rear side of the wood veneer and the polyurethane foam plate, then the second moving assembly is utilized to drive the two vertical plates to move in opposite directions, so that the wood veneer and the polyurethane foam plate are separated from the clamping groove, at the moment, the second conveying mechanism is utilized to drive the wood veneer and the polyurethane foam plate to descend, the wood veneer and the polyurethane foam plate are sequentially stacked on the lower hot pressing plate, then the hydraulic rod is started, the moving plates drive the upper hot pressing plate to descend, the cooperation of the lower hot pressing plate and the upper hot pressing plate is utilized, the hot pressing operation on the plywood is realized, manual stacking is not needed, and the whole-course automation is realized, and the working efficiency is improved.
Preferably, the upper end of movable plate is fixed with two risers, and swivelling joint has two drive rollers between two risers, is fixed with conveyor motor on one of them riser, and conveyor motor's output shaft end and one of them drive roller fixed connection, two drive rollers pass through the conveyer belt transmission and are connected, two be fixed with the backup pad between the riser, the backup pad is close to one side of hot pressing board down and is fixed with a plurality of elastic component, and elastic component's the other end is fixed with the gusset plate, and the gusset plate is contradicted with the inboard of conveyer belt.
Adopt above structure, when transporting timber veneer and polyurethane foam board, conveyor motor drives the drive roller and rotates, the drive roller drives the conveyer belt and rotates, thereby utilize the conveyer belt to drive timber veneer and polyurethane foam board decline, make timber veneer and polyurethane foam board pile up in proper order on the hot-pressing board down, and elastic component and gusset plate's setting, at the during operation, can utilize elastic component and gusset plate's cooperation, support the conveyer belt, thereby guarantee the stability of two conveyer belts to timber veneer and polyurethane foam board centre gripping, make timber veneer and polyurethane foam board can steadily fall, prevent timber veneer and polyurethane foam board skew, improve the processingquality of plywood.
Preferably, the gluing mechanism comprises a storage box, a material conveying pump is fixed on the storage box, a first material conveying pipe is fixed at the discharge end of the material conveying pump, two second material conveying pipes are fixed on the first material conveying pipe, a discharging pipe is fixed at the other end of the second material conveying pipe, a plurality of spray heads are fixed at the lower side of the discharging pipe, one end of the discharging pipe is fixedly connected with the storage box, two trowelling components are fixed on the storage box, and the trowelling components correspond to the discharging pipes one by one.
After the clamping assembly moves to the gluing mechanism, the first moving assembly drives the storage box to move forwards, so that the two discharging pipes are respectively located at the upper right ends of the lower wood veneer and the middle polyurethane foam board, then the material conveying pump is started, the rotating motor and the screeding assembly are started simultaneously, the spray head sprays polyurethane adhesive on the wood veneer and the polyurethane foam board, the wood veneer and the polyurethane foam board move to the right, comprehensive spraying on the wood veneer and the polyurethane foam board is achieved, the screeding assembly is utilized to screede the polyurethane adhesive on the wood veneer and the polyurethane foam board, the polyurethane adhesive is uniformly distributed, after the discharging pipes are moved out of the right ends of the wood veneer and the polyurethane foam board, the first moving assembly is utilized, so that the discharging pipes move backwards and are separated from the clamping assembly, and the reserved space is set, so that the discharging pipes have enough spraying space, and the comprehensiveness of spraying is ensured.
Preferably, the trowelling subassembly includes the fixing base, the spout has been seted up to fixing base and storage case fixed connection's downside, the inside of spout is fixed with the slide rail, sliding connection has the vibrations seat on the slide rail, the lower extreme of vibrations seat is fixed with the mounting panel, the downside of mounting panel is fixed with a plurality of vertical trowelling boards, be fixed with horizontal trowelling board between the adjacent vertical trowelling board, the inside swivelling joint of spout has the rotation axis, be provided with the trowelling motor in the fixing base, trowelling motor's output shaft end and rotation axis fixed connection, be fixed with the rotary disk on the rotation axis, annular wave groove has been seted up on the rotary disk, sliding connection has the spliced pole on the annular wave groove, be fixed with the connecting seat on the vibrations seat, the connecting seat passes through connecting rod and spliced pole fixed connection.
By adopting the structure, when the polyurethane adhesive is spread, the trowelling motor is started, the rotating shaft is driven to rotate, the rotating shaft is rotated to drive the rotating disk to rotate, thereby the sliding column slides in the annular wave groove, the annular wave groove is utilized to drive the sliding column to reciprocate left and right, the mounting plate drives the longitudinal trowelling plate and the transverse trowelling plate to vibrate at a high speed in a small range, thereby the longitudinal trowelling plate is used for carrying out longitudinal trowelling on the polyurethane adhesive, meanwhile, the transverse trowelling plate is utilized for carrying out transverse trowelling, the trowelling effect is good, the polyurethane adhesive is prevented from being smeared unevenly or having bubbles to influence the adhesive force of the plywood, the processing quality of the plywood is improved, the transverse trowelling plate can be arranged at the middle part of the longitudinal trowelling plate, the longitudinal trowelling is realized firstly, the trowelling is transversely trowelled at last, and the trowelling effect is further improved.
Compared with the prior art, the preparation method of the polyurethane plywood has the following advantages:
1. the preparation method of the polyurethane plywood is simple in operation and easy to realize, the environment-friendly performance is good, the linkage effect between preparation equipment is good, the flow processing of the plywood can be realized, the processing efficiency is improved, the processing cost is reduced, the polyurethane foam board and the wood veneer can be simultaneously glued and hot-pressed, then hot-press molding is simultaneously carried out, the preparation steps are reduced, the plywood cannot be hot-pressed for many times, and the adhesive force of the plywood can be improved.
2. The plywood processing equipment provided by the invention realizes linkage operation of the device, reduces the cost of the equipment, improves the processing quality of the plywood, realizes drying of a base material and hot-press forming of the plywood by using the upper hot pressing plate, reduces the cost of the equipment, can simultaneously carry out gluing and hot-press on the polyurethane foam board and the wood veneer, ensures the adhesive force between the plywood and improves the processing quality of the plywood.
3. The setting of second transport mechanism, when transporting timber veneer and polyurethane foam board, conveyor motor drives the drive roller and rotates, the drive roller drives the conveyer belt and rotates, thereby utilize the conveyer belt to drive timber veneer and polyurethane foam board decline, make timber veneer and polyurethane foam board pile up in proper order on the hot-pressing board down, and the setting of elastic component and gusset plate, at the during operation, can utilize the cooperation of elastic component and gusset plate, support the conveyer belt, thereby guarantee the stability of two conveyer belts to timber veneer and polyurethane foam board centre gripping, make timber veneer and polyurethane foam board can steadily fall, prevent timber veneer and polyurethane foam board skew, improve the processingquality of plywood.
4. The structure setting of amortization subassembly, when carrying out the amortization to polyurethane adhesive, open the motor of screeding, it is rotatory to drive the rotation axis, the rotation axis is rotatory to drive the rotary disk and rotate, thereby make the slip post slide in annular wave inslot, utilize annular wave inslot drive slip post reciprocal left and right movement, make the mounting panel drive vertical screeding board and horizontal screeding board shake at a small extent at a high speed, thereby make vertical screeding board carry out vertical screeding to polyurethane adhesive, utilize horizontal screeding board to carry out horizontal screeding simultaneously, screeding effectually, prevent that polyurethane adhesive from smearing inhomogeneous or having the adhesion that the bubble influences the plywood, improve the processingquality of plywood, and horizontal screeding board can set up the mid portion at vertical screeding board, realize earlier vertical screeding, at horizontal screeding, at last at vertical screeding, further improvement screeding effect.
Drawings
Fig. 1 is a process flow diagram of the present invention.
FIG. 2 is a table of tests in the present invention.
Fig. 3 is a schematic view of the structure of the plywood processing apparatus of the present invention.
Fig. 4 is a schematic structural view of the clamping assembly in the present invention.
Fig. 5 is a schematic view of the structure of the hot press mechanism according to the present invention.
Fig. 6 is a schematic structural view of a second conveying mechanism in the present invention.
Fig. 7 is a schematic structural view of the glue spreading mechanism in the present invention.
Fig. 8 is a schematic perspective view of the trowelling mechanism of the present invention.
Fig. 9 is a schematic view of the internal structure of the trowelling mechanism in the present invention.
Fig. 10 is a partial enlarged view at a in fig. 9.
In the figure, 1, a base; 2. a soaking box; 3. a support post; 4. a support frame; 5. a threaded rod; 6. a rotating electric machine; 7. a movable seat; 8. a hydraulic rod; 9. a clamping assembly; 10. a first moving assembly; 11. a gluing mechanism; 12. a sealing plate; 13. a second moving assembly; 14. a vertical plate; 15. a clamping seat; 16. a clamping groove; 17. an upper hot pressing plate; 18. a support base; 19. a driving motor; 20. a two-way threaded rod; 21. a moving plate; 22. a riser; 23. a driving roller; 24. a conveying motor; 25. a conveyor belt; 26. a lower hot pressing plate; 27. a support plate; 28. an elastic component; 29. a reinforcing plate; 30. a storage bin; 31. a material conveying pump; 32. a first feed delivery tube; 33. a second feed delivery tube; 34. a discharge pipe; 35. a spray head; 36. a fixing seat; 37. a vibration seat; 38. a mounting plate; 39. a longitudinal trowelling plate; 40. a transverse trowelling plate; 41. a chute; 42. a slide rail; 43. a rotation shaft; 44. a rotating disc; 45. an annular wave groove; 46. a sliding column; 47. a connecting seat; 48. and (5) connecting a rod.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
Example 1
As shown in fig. 1, a preparation method of polyurethane plywood comprises the following steps:
s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer;
s2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 38 ℃, and the soaking time is as follows: 125min;
s3, drying the soaked polyurethane foam board and the wood veneer at 135 ℃ until the water content reaches 17%;
s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 160 ℃ until the water content reaches 7%;
s5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing;
S6, after the smearing is finished, transferring the polyurethane foam board and the wood veneer into a hot pressing mechanism by using a first conveying mechanism, stacking the polyurethane foam board and the wood veneer on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and then pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood.
Preferably, the sizing amount on both the wood veneer and the polyurethane foam board in S5 is 355g/m2.
Preferably, the hot pressing temperature in S6 is 115℃and the pressing time is 50 minutes.
Preferably, after the polyurethane plywood is pressurized, the pressure is maintained for 25 minutes, then the pressure is relieved, and the hot-pressing pressure required by the pressure maintaining is 1.6MPa.
Example two
As shown in fig. 1, a preparation method of polyurethane plywood comprises the following steps:
s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer;
s2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 38 ℃, and the soaking time is as follows: 125min;
S3, drying the soaked polyurethane foam board and the wood veneer at 135 ℃ until the water content reaches 17%;
s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 160 ℃ until the water content reaches 7%;
s5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing;
s6, after the smearing is finished, transferring the polyurethane foam board and the wood veneer into a hot pressing mechanism by using a first conveying mechanism, stacking the polyurethane foam board and the wood veneer on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and then pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood.
Preferably, the sizing amount on both the wood veneer and the polyurethane foam board in S5 is 355g/m2.
Preferably, the hot pressing temperature in S6 is 115℃and the pressing time is 50 minutes.
Preferably, after the polyurethane plywood is pressurized, the pressure is maintained for 25 minutes, then the pressure is relieved, and the hot-pressing pressure required by the pressure maintaining is 1.6MPa.
Preferably, as shown in fig. 3-10, the equipment adopted in steps S2-S6 is plywood processing equipment, the plywood processing equipment comprises a base 1, a soaking box 2 is fixed at the left end of the base 1, a support frame 4 is fixed at the right end of the base 1, a first conveying mechanism is arranged between the soaking box 2 and the support frame 4, the first conveying mechanism comprises a support column 3 fixedly connected with the upper end of the soaking box 2, a threaded rod 5 is rotatably connected between the support column 3 and the support frame 4, a rotating motor 6 is fixed on the support frame 4, the output shaft end of the rotating motor 6 is fixedly connected with one end of the threaded rod 5, a movable seat 7 is connected with the threaded rod 5 in a threaded manner, a hydraulic rod 8 is fixed on the movable seat 7, a clamping assembly 9 is arranged at the other end of the hydraulic rod 8, an upper hot-pressing plate 17 is arranged on the clamping assembly 9, a first movable assembly 10 is further arranged on the base 1, a gluing mechanism 11 is arranged between the soaking box 2 and the support frame 4, a hot-pressing mechanism is arranged in the support frame 4, and a second conveying mechanism is arranged on the hot-pressing mechanism.
Adopt above structure, at the during operation, utilize clamping assembly 9 to carry out the centre gripping with polyurethane foam board and timber veneer that handle fixedly, then utilize hydraulic stem 8 to drive clamping assembly 9 and descend for polyurethane foam board and timber veneer enter into the inside of soaking case 2, utilize the protection against insects liquid to soak, soak temperature is 38 ℃, and the soak time is: 125min, discharging insect-proof liquid after soaking, heating the inside of a soaking box 2 to 135 ℃ by using an upper hot pressing plate 17, drying a polyurethane foam board and a wood veneer, adding clear water into the soaking box 2 after the water content of the polyurethane foam board and the wood veneer is driven to 17%, flushing the polyurethane foam board and the wood veneer by using the clear water, heating the inside of the soaking box 2 to 160 ℃ again by using the upper hot pressing plate 17 after the surface is flushed clean, leading the water content of the polyurethane foam board and the wood veneer to reach 7%, then driving a clamping assembly 9 to rise by using a hydraulic rod 8, leading the polyurethane foam board and the wood veneer to move out of the soaking box 2, starting a rotating motor 6, driving a threaded rod 5 to rotate by the rotating motor 6, leading a movable seat 7 to drive the polyurethane foam board and the wood veneer to move onto a gluing mechanism 11, and then starting a first movable assembly 10, the gluing mechanism 11 is arranged on the upper sides of the lowest-layer wood veneer and the middle-layer polyurethane foam board respectively, polyurethane adhesive is coated on the polyurethane foam board and the wood veneer simultaneously, the polyurethane adhesive is coated on the polyurethane foam board and the wood veneer simultaneously by using a coating component, after coating, the polyurethane foam board and the wood veneer are moved to the upper side of a hot pressing mechanism by using a threaded rod 5 to rotate and drive a movable seat 7 to move, the front side and the rear side of the polyurethane foam board and the wood veneer are clamped by using a second conveying mechanism, the clamping component 9 is released at the moment, then the polyurethane foam board and the wood veneer are stacked on the hot pressing mechanism by using the second conveying mechanism, the upper hot pressing board 17 is driven to descend by using a hydraulic rod 8, the polyurethane foam board and the wood veneer are hot pressed by using the cooperation of the upper hot pressing board 17 and the hot pressing mechanism, the polyurethane plywood is obtained, so that the continuity of plywood processing is improved, the flow production of the plywood is realized, the upper hot pressing plate 17 is utilized to realize the drying of a base material and the hot press forming of the plywood, the cost of equipment is reduced, the polyurethane foam board and the wood veneer can be simultaneously glued and hot pressed, the adhesive force between the plywood is ensured, and the quality of the plywood processing is improved
Preferably, the clamping assembly 9 comprises a sealing plate 12, the sealing plate 12 is fixedly connected with the telescopic end of the hydraulic rod 8, a second moving assembly 13 is fixed on the other side of the sealing plate 12, two vertical plates 14 are arranged on the second moving assembly 13, three clamping seats 15 are respectively fixed on opposite faces of the two vertical plates 14, clamping grooves 16 are formed in the clamping seats 15, a reserved space is formed between the clamping seats 15 and the clamping grooves 16, and an upper hot pressing plate 17 is arranged on the lower side of the second moving assembly 13.
With the above structure, when in operation, the second moving assembly 13 is utilized to drive the two vertical plates 14 to move reversely, the two vertical plates are sequentially placed on the corresponding clamping seats 15 from top to bottom according to the order of the wood single plates, the placing mode is convenient to be matched with the gluing mechanism 11 and the hot pressing mechanism, then the second moving assembly 13 is utilized to drive the two vertical plates 14 to move oppositely, the wood single plates and the polyurethane foam plates are fixed, after the fixing is completed, the hydraulic rod 8 drives the sealing plate 12 to descend, the wood single plates and the polyurethane foam plates enter the soaking box 2, and the sealing plate 12 is arranged to seal the soaking box 2.
Preferably, the hot pressing mechanism comprises a supporting seat 18, a lower hot pressing plate 26 is fixed on the supporting seat 18, a cavity is formed in the supporting seat 18, a driving motor 19 is fixed on the supporting seat 18, a bidirectional threaded rod 20 extending into the cavity is fixed at the output shaft end of the driving motor 19, two movable plates 21 are connected to the bidirectional threaded rod 20 in a threaded manner, the upper ends of the movable plates 21 extend out of the cavity and are connected with the second conveying mechanism, and the lower hot pressing plate 26 is located between the two movable plates 21.
With the above structure, after the clamping assembly 9 moves to the upper part of the hot pressing mechanism, the driving motor 19 is started, the driving motor 19 drives the bidirectional threaded rod 20 to rotate, so that the two moving plates 21 are driven to move in opposite directions, the two moving plates 21 are respectively clamped on the front side and the rear side of the wood veneer and the polyurethane foam board, then the second moving assembly 13 is utilized to drive the two vertical plates 14 to move in opposite directions, so that the wood veneer and the polyurethane foam board are separated from the clamping groove 16, at the moment, the second conveying mechanism is utilized to drive the wood veneer and the polyurethane foam board to descend, so that the wood veneer and the polyurethane foam board are sequentially stacked on the lower hot pressing plate 26, then the hydraulic rod 8 is started, the moving plates 21 drive the upper hot pressing plate 17 to descend, the hot pressing operation of the plywood is realized by utilizing the cooperation of the lower hot pressing plate 26 and the upper hot pressing plate 17, manual stacking is not needed, the whole process is automated, and the working efficiency is improved.
Preferably, two risers 22 are fixed at the upper end of the movable plate 21, two driving rollers 23 are rotatably connected between the two risers 22, a conveying motor 24 is fixed on one of the risers 22, the output shaft end of the conveying motor 24 is fixedly connected with one of the driving rollers 23, the two driving rollers 23 are in transmission connection through a conveying belt 25, a supporting plate 27 is fixed between the two risers 22, a plurality of elastic components 28 are fixed on one side, close to the lower hot pressing plate 26, of the supporting plate 27, a reinforcing plate 29 is fixed on the other end of the elastic component 28, and the reinforcing plate 29 is in contact with the inner side of the conveying belt 25.
Adopt above structure, when transporting timber veneer and polyurethane foam board, conveyor motor 24 drives drive roller 23 and rotates, drive roller 23 drives conveyer belt 25 and rotates, thereby utilize conveyer belt 25 to drive timber veneer and polyurethane foam board and descend, make timber veneer and polyurethane foam board pile up in proper order on hot pressing plate 26 down, and the setting of elastic component 28 and gusset plate 29, in the during operation, can utilize elastic component 28 and gusset plate 29's cooperation, support conveyer belt 25, thereby guarantee the stability of two conveyer belts 25 to timber veneer and polyurethane foam board centre gripping, make timber veneer and polyurethane foam board can steadily fall, prevent timber veneer and polyurethane foam board skew, improve the processingquality of plywood.
Preferably, the gluing mechanism 11 comprises a storage box 30, a material conveying pump 31 is fixed on the storage box 30, a first material conveying pipe 32 is fixed at the discharge end of the material conveying pump 31, two second material conveying pipes 33 are fixed on the first material conveying pipe 32, a material discharging pipe 34 is fixed at the other end of the second material conveying pipe 33, a plurality of spray heads 35 are fixed on the lower side of the material discharging pipe 34, one end of the material discharging pipe 34 is fixedly connected with the storage box 30, two trowelling components are fixed on the storage box 30, and the trowelling components correspond to the material discharging pipes 34 one by one.
With the above structure, after the clamping assembly 9 moves onto the gluing mechanism 11, the first moving assembly 10 drives the storage box 30 to move forwards, so that the two discharging pipes 34 are respectively positioned at the upper right ends of the lower wood veneer and the middle polyurethane foam board, then the material conveying pump 31 is started, so that the rotating motor 6 and the leveling assembly are started simultaneously, the spray nozzle 35 sprays the polyurethane adhesive on the wood veneer and the polyurethane foam board, simultaneously, the wood veneer and the polyurethane foam board are enabled to move rightwards, the comprehensive spraying on the wood veneer and the polyurethane foam board is realized, the leveling assembly is utilized to level the polyurethane adhesive on the wood veneer and the polyurethane foam board, the polyurethane adhesive is uniformly distributed, after the discharging pipes 34 are moved out of the right ends of the wood veneer and the polyurethane foam board, the first moving assembly 10 is utilized, so that the material outlet pipe 34 moves backwards and is separated from the clamping assembly 9, the arrangement of a reserved space can enable the material outlet pipe 34 to have enough spraying space, and the comprehensive spraying is ensured.
Preferably, the trowelling assembly comprises a fixed seat 36, the fixed seat 36 is fixedly connected with the storage box 30, a sliding groove 41 is formed in the lower side of the fixed seat 36, a sliding rail 42 is fixed in the sliding groove 41, a vibration seat 37 is connected to the sliding rail 42 in a sliding mode, a mounting plate 38 is fixed to the lower end of the vibration seat 37, a plurality of longitudinal trowelling plates 39 are fixed to the lower side of the mounting plate 38, a transverse trowelling plate 40 is fixed between the adjacent longitudinal trowelling plates 39, a rotating shaft 43 is connected to the inner portion of the sliding groove 41 in a rotating mode, a trowelling motor is arranged in the fixed seat 36, an output shaft end of the trowelling motor is fixedly connected with the rotating shaft 43, a rotating disc 44 is fixed to the rotating disc 44, an annular wave groove 45 is formed in the rotating disc 44, a sliding column 46 is connected to the annular wave groove 45 in a sliding mode, a connecting seat 47 is fixed to the vibration seat 37, and the connecting seat 47 is fixedly connected with the sliding column 46 through a connecting rod 48.
With the above structure, when polyurethane adhesive is spread, the trowelling motor is started, the rotating shaft 43 is driven to rotate, the rotating shaft 43 rotates to drive the rotating disc 44 to rotate, thereby the sliding column 46 slides in the annular wave groove 45, the annular wave groove 45 is utilized to drive the sliding column 46 to reciprocate left and right, the mounting plate 38 drives the longitudinal trowelling plate 39 and the transverse trowelling plate 40 to vibrate at a high speed in a small range, thereby the longitudinal trowelling plate 39 is used for carrying out longitudinal trowelling on the polyurethane adhesive, and meanwhile, the transverse trowelling plate 40 is utilized for carrying out transverse trowelling, so that the trowelling effect is good, the polyurethane adhesive is prevented from being smeared unevenly or having bubbles to influence the adhesive force of the plywood, the processing quality of the plywood is improved, the transverse trowelling plate 40 can be arranged in the middle part of the longitudinal trowelling plate 39, the longitudinal trowelling is realized firstly, and the trowelling effect is further improved at the end.
Example III
As shown in fig. 1, a preparation method of polyurethane plywood comprises the following steps:
s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer;
S2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 30 ℃, and the soaking time is as follows: 150min;
s3, drying the soaked polyurethane foam board and the wood veneer at 120 ℃ until the water content reaches 20%;
s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 180 ℃ until the water content reaches 5%;
s5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing;
s6, after the smearing is finished, transferring the polyurethane foam board and the wood veneer into a hot pressing mechanism by using a first conveying mechanism, stacking the polyurethane foam board and the wood veneer on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and then pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood.
Preferably, the sizing amount on the wood veneer and the polyurethane foam board in S5 is 380g/m2.
Preferably, the hot pressing temperature in S6 is 110℃and the pressing time is 60 minutes.
Preferably, after the polyurethane plywood is pressurized, the pressure is maintained for 20min, then the pressure is relieved, and the hot-pressing pressure required by the pressure maintaining is 1.8MPa.
The plywood processing equipment used in the preparation methods of polyurethane plywood in the present examples S2 to S6 is the same as that in the examples, except for the different process conditions.
Example IV
As shown in fig. 1, a preparation method of polyurethane plywood comprises the following steps:
s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer;
s2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 45 ℃, and the soaking time is as follows: 100min;
s3, drying the soaked polyurethane foam board and the wood veneer at the drying temperature of 150 ℃ until the water content reaches 15%;
s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 140 ℃ until the water content reaches 9%;
S5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing;
s6, after the smearing is finished, transferring the polyurethane foam board and the wood veneer into a hot pressing mechanism by using a first conveying mechanism, stacking the polyurethane foam board and the wood veneer on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and then pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood.
Preferably, the sizing amount on both the wood veneer and the polyurethane foam board in S5 is 330g/m2.
Preferably, the hot pressing temperature in S6 is 120 ℃ and the pressing time is 40min.
Preferably, after the polyurethane plywood is pressurized, the pressure is maintained for 30min, then the pressure is relieved, and the hot-pressing pressure required by the pressure maintaining is 1.4MPa.
The plywood processing equipment used in the preparation methods of polyurethane plywood in the present examples S2 to S6 is the same as that in the examples, except for the different process conditions.
Experimental example
The polyurethane plywood prepared in examples 1-4 was subjected to performance test control according to the national standard, and the performance test index control table is shown in the following table:
Figure DEST_PATH_IMAGE002
as can be seen from the test data in the above table, the elastic modulus, static bending strength, wet strength and peel adhesion of the polyurethane plywood prepared in example two were all higher than those of the polyurethane plywood prepared in example one, and therefore, the elastic modulus, static bending strength, wet strength and peel adhesion of the polyurethane plywood can be improved comprehensively using the plywood processing apparatus of the present invention.
Compared with the third embodiment and the fourth embodiment, the process conditions such as processing temperature, processing time and the like are different, the equipment used in the production steps are the same, and the elastic modulus, static bending strength, wet strength and peeling adhesion force of the polyurethane plywood prepared in the third embodiment and the fourth embodiment are lower than those of the polyurethane plywood prepared in the second embodiment, so that the process conditions such as processing temperature, processing time and the like are different, and the elastic modulus, static bending strength, wet strength and peeling adhesion force of the polyurethane plywood are also influenced.
The preparation method of the polyurethane plywood is simple in operation and easy to realize, the environment-friendly performance is good, the linkage effect between preparation equipment is good, the flow processing of the plywood can be realized, the processing efficiency is improved, the processing cost is reduced, the polyurethane foam board and the wood veneer can be simultaneously glued and hot-pressed, then hot-press molding is simultaneously carried out, the preparation steps are reduced, the plywood cannot be hot-pressed for many times, and the adhesive force of the plywood can be improved.
The plywood processing equipment provided by the invention realizes linkage operation of the device, reduces the cost of the equipment, improves the processing quality of the plywood, realizes drying of a base material and hot-press forming of the plywood by using the upper hot pressing plate, reduces the cost of the equipment, can simultaneously carry out gluing and hot-press on the polyurethane foam board and the wood veneer, ensures the adhesive force between the plywood and improves the processing quality of the plywood.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (5)

1. The preparation method of the polyurethane plywood is characterized by comprising the following steps of: s1, cutting a polyurethane foam board and a wood veneer into preset sizes, and carrying out frosting treatment on the side edges and the surfaces of the polyurethane foam board and the wood veneer to remove impurities, so as to obtain a smooth and clean polyurethane foam board and the wood veneer; s2, immersing the treated polyurethane foam board and the wood veneer into insect-proof liquid for soaking, wherein the soaking temperature is 30-45 ℃, and the soaking time is as follows: 100-150min; s3, drying the soaked polyurethane foam board and the wood veneer at 120-150 ℃ until the water content reaches 15-20%; s4, placing the dried polyurethane foam board and the wood veneer into clear water for washing, and drying again after the surface is washed clean, wherein the drying temperature is 140-180 ℃ until the water content reaches 5-9%; s5, transferring the dried polyurethane foam board and the wood veneer into a gluing mechanism by using a first conveying mechanism, simultaneously smearing polyurethane adhesive on the wood veneer and the polyurethane foam board by using the gluing mechanism, and trowelling the polyurethane adhesive by using a trowelling assembly when gluing; s6, transferring the polyurethane foam board and the wood veneers into a hot pressing mechanism by using a first conveying mechanism after the smearing is finished, stacking the polyurethane foam board and the wood veneers on a lower hot pressing plate of the hot pressing mechanism by using a second conveying mechanism, and pressing the polyurethane foam board between the two wood veneers by using the cooperation of an upper hot pressing plate and the lower hot pressing plate to obtain the polyurethane plywood; the equipment adopted in the steps S2-S6 is plywood processing equipment, the plywood processing equipment is characterized by comprising a base (1), a soaking box (2) is fixed at the left end of the base (1), a supporting frame (4) is fixed at the right end of the base (1), a first conveying mechanism is arranged between the soaking box (2) and the supporting frame (4), the first conveying mechanism comprises a support column (3) fixedly connected with the upper end of the soaking box (2), a threaded rod (5) is rotationally connected between the support column (3) and the supporting frame (4), a rotating motor (6) is fixed on the supporting frame (4), an output shaft end of the rotating motor (6) is fixedly connected with one end of the threaded rod (5), a movable seat (7) is connected with the threaded rod (5) in a threaded manner, a hydraulic rod (8) is fixed on the movable seat (7), a clamping assembly (9) is arranged at the other end of the hydraulic rod (8), an upper hot-pressing plate (17) is arranged on the clamping assembly (9), a first movable assembly (10) is further arranged on the base (1), a gluing mechanism (11) is arranged on the movable assembly, the gluing mechanism (11) is arranged between the soaking box (2) and the supporting frame (4), the hot-pressing mechanism (18) is arranged in the hot-pressing mechanism, a lower hot pressing plate (26) is fixed on the supporting seat (18), a cavity is formed in the supporting seat (18), a driving motor (19) is fixed on the supporting seat (18), a bidirectional threaded rod (20) extending into the cavity is fixed at the output shaft end of the driving motor (19), two moving plates (21) are connected to the bidirectional threaded rod (20) in a threaded manner, the upper end of each moving plate (21) extends out of the cavity and is connected with a second conveying mechanism, a lower hot pressing plate (26) is positioned between the two moving plates (21), two vertical plates (22) are fixed at the upper end of each moving plate (21), two driving rollers (23) are connected between the two vertical plates (22) in a rotating manner, a conveying motor (24) is fixed on one vertical plate (22), the output shaft end of the conveying motor (24) is fixedly connected with one driving roller (23), the two driving rollers (23) are connected with each other in a transmission manner through a conveying belt (25), a supporting plate (27) is fixed between the two vertical plates (22), one side of each supporting plate (27) close to the lower hot pressing plate (26) is fixedly provided with a plurality of elastic assemblies (28), the other ends of the elastic assemblies (28) are fixedly connected with a reinforcing plate (29) and the other, the reinforcing plate (29) is abutted against the conveying mechanism (11), the utility model is characterized in that a material conveying pump (31) is fixed on the material storage box (30), the discharge end of the material conveying pump (31) is fixedly provided with a first material conveying pipe (32), two second material conveying pipes (33) are fixed on the first material conveying pipe (32), the other end of each second material conveying pipe (33) is fixedly provided with a material discharging pipe (34), the lower side of each material discharging pipe (34) is fixedly provided with a plurality of spray heads (35), one end of each material discharging pipe (34) is fixedly connected with the material storage box (30), two screeding components are fixed on the material storage box (30), the screeding components are in one-to-one correspondence with the material discharging pipes (34), each screeding component comprises a fixed seat (36), the fixed seat (36) is fixedly connected with the material storage box (30), a sliding groove (41) is arranged on the lower side of the fixed seat (36), a sliding rail (42) is fixedly provided with a vibration seat (37) on the sliding rail (42), the lower end of each vibration seat (37) is fixedly provided with a mounting plate (38), the lower side of each mounting plate (38) is fixedly provided with a plurality of longitudinal screeding plates (39), a motor (40) is fixedly connected with a rotary shaft (43) between the adjacent longitudinal plates (39), the motor (40) is fixedly connected with a rotary shaft (43), the rotary shaft (43) is fixedly connected with the rotary shaft (43), an annular wave groove (45) is formed in the rotating disc (44), a sliding column (46) is connected in the annular wave groove (45) in a sliding mode, a connecting seat (47) is fixed on the vibration seat (37), and the connecting seat (47) is fixedly connected with the sliding column (46) through a connecting rod (48).
2. The method for preparing polyurethane plywood as claimed in claim 1, wherein the sizing amount of the wood veneer and the polyurethane foam board in the step S5 is 330-380g/m 2 。
3. The method for preparing polyurethane plywood according to claim 1, wherein the hot pressing temperature in the step S6 is 110-120 ℃ and the pressing time is 40-60min.
4. The method for preparing polyurethane plywood according to claim 3, wherein after the polyurethane plywood is pressurized, the pressure is maintained for 20-30min, then the pressure is relieved, and the hot-pressing pressure required for the pressure maintaining is 1.4-1.8MPa.
5. The preparation method of the polyurethane plywood according to claim 1, wherein the clamping assembly (9) comprises a sealing plate (12), the sealing plate (12) is fixedly connected with the telescopic end of the hydraulic rod (8), the second moving assembly (13) is fixed on the other side of the sealing plate (12), two vertical plates (14) are arranged on the second moving assembly (13), three clamping seats (15) are fixed on opposite faces of the two vertical plates (14), clamping grooves (16) are formed in the clamping seats (15), a reserved space is formed between the clamping seats (15) and the clamping grooves (16), and an upper hot-pressing plate (17) is arranged on the lower side of the second moving assembly (13).
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