GB2590116A

GB2590116A - Method and device for continuously forming ultra-thick wood/bamboo molded hollow wallboard

Info

Publication number: GB2590116A
Application number: GB2014396.2A
Authority: GB
Inventors: Liu Lequn; Liu Fangcheng
Original assignee: Zhejiang Academy of Forestry
Current assignee: Zhejiang Academy of Forestry
Priority date: 2019-10-25
Filing date: 2020-09-14
Publication date: 2021-06-23
Also published as: GB202014396D0; AU2020102235A4; CN110722656A; CN110722656B

Abstract

Device for continuously forming ultra-thick wood/bamboo moulded hollow wallboard comprising moulding cavity M with rectangular cross-section, inner moulding tubes 4 and punch 3. Top ends of tubes 4 are fixed on a beam, punch 3 moves up and down within the cavity M. Cavity M is enclosed by two moulding plates (12, fig. 5) keeping parallel distance in thickness direction and provided with heating tube connected to heating mechanism, and two thickness gauges 2 at sides of cavity M in a width direction. Press 3 is in movable fit with the tubes 4. Inner tubes 4 are double-layer heating tubes connected to heating mechanism located outside device and connected to input tube and output tube to form a loop for circulating liquid transfer medium. Also claimed is method of forming hollow wallboard by driving punch 3 in cavity M relative to tubes 4 and reinforcing ribs 5, heating inner wall of cavity M and wall of tubes 4. Punch is moved from opening of cavity enabling feeding device to feed wood/bamboo particles and glue into cavity M, bottom plate 1 supporting particles. Punch 3 is moved downwards into cavity M to combine ribs 5, particles, glue into board blank.

Description

METHOD AND DEVICE FOR CONTINUOUSLY FORMING ULTRA-THICK

TECHNICAL FIELD

The present invention relates to a device and method for kilning a hollow wallboard, in particular to a device and method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard.

BACKGROUND

Wooden buildings are the most important architectural form in the long history of Chinese architecture. However, since the 1960s, due to the lack of wood caused by the wanton felling of forests, wooden buildings have been gradually replaced by reinforced concrete buildings. At present, wooden buildings in developed countries generally account for more than 45% of the total construction volume. In North American countries, the proportion has reached more than 85%. These countries have a significant advantage in the development of wooden buildings, that is, they have rich forest resources. With the rapid development of economy. Chinese people are increasingly pursuing the beautiful and comfortable natural living environment, and wooden buildings are rapidly reemerging. However, the timber resources are still in serious shortage, and it is urgent for the construction circle to develop a wallboard with similar properties to replace the wooden wallboard.

China's artificial board production is large, accounting for 160% of the world's total artificial boards, and it is expected to develop a suitable artificial board to replace the wooden wallboard. Due to the extreme lack of wood, the only feasible way to make the suitable artificial wallboard is to use wood/bamboo processing residues. The artificial boards made from wood/bamboo processing residues are mainly medium-density fiberboard (MDF) and particle board. The existing manufacturing process cannot use the heat-insulating wood to produce boards with a thickness of more than 5 cm, or produce an artificial wallboard that meets the specification requirements for wooden buildings. The development of an ultra-thick artificial board that can be industrialized with a simple process and low cost to replace the wooden wallboard has become a major technical goal for the wooden building industry and the artificial board industry.

SUMMARY

In order to overcome the shortcomings of the prior art mentioned in the background, an objective of the present invention is to provide a device and method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard. The forming device and method effectively improve the compressive strength of the wood/bamboo molded hollow wallboard in a punching direction, improve the dimensional stability of the board, and realize the balance of properties and shape stability of the board. The forming device and method feature simple process, high production efficiency, continuous production and low production cost.

The technical solutions of the present invention are as follows: A method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard includes the following steps: 1) driving a punch in a molding cavity by an actuating mechanism to move up and down in a straight line along vertical guide rails, so that the punch moves relative to a plurality of inner molding tubes and a plurality of reinforcing ribs which are vertically provided in the molding cavity and are in a movable fit with the punch; allowing a heating mechanism to heat an inner wall of the molding cavity and a wall of the inner molding tubes; 2) moving the punch upwards for a distance away from an upper opening on a molding plate to open a top inlet of the molding cavity; enabling a feeding device to evenly feed wood/bamboo particles accompanied by glue into the molding cavity through the top inlet, where the wood/bamboo particles are supported by a bottom plate after falling into the molding cavity; 3) driving the punch by the actuating mechanism to move downwards and enter the molding cavity to punch the fed wood/bamboo particles, so that the wood/bamboo particles and the reinforcing ribs are combined tightly into a board blank to be heated in the molding cavity; moving the board blank together with the bottom plate connected to the bottom of the reinforcing ribs downwards for a plurality of distances; forming holes penetrating through the board blank from top to bottom by using the inner molding tubes; 4) moving the punch upwards for a distance away from the upper opening of the molding cavity to open the top inlet of the molding cavity; enabling the feeding device to evenly feed the wood/bamboo particles accompanied by the glue into the molding cavity through the top inlet, so that the wood/bamboo particles are laid on an upper part of the board blank formed in the above step after falling into the molding cavity; allowing the punch to punch the fed particles while the formed board blank is heated from outside to inside at high temperature by the wall of the molding cavity and the wall of the inner molding tubes, so that the glue quickly solidifies every time the board blank is subjected to mobile punching; and 5) repeating steps 3) and 4) to perform continuous cyclic operations, that is, feeding, punching and heating the wood/bamboo particles to form a continuously formed board blank; gradually moving the board Hank downwards out of the molding cavity, to obtain a finished wood/bamboo molded hollow wallboard; where, the molding cavity is enclosed by two molding plates keeping a distance in a thickness direction of the cavity and two thickness gauges provided at both ends of the cavity in a width direction; the molding cavity is provided with an opening on the top and at the bottom, respectively; the inner molding tubes are double-layer heating tubes connected to a heating mechanism; the heating mechanism is located outside a device, and provided with an input tube and an output tube on the top of the inner molding tubes to form a loop for circulating a liquid heat transfer medium.

In the double-layer heating tube, an outer diameter of an inner tube is smaller than an inner diameter of an outer tube; a bottom end of the outer tube is closed, and a bottom end of the inner tube is open and kept at a distance from the bottom end of the outer tube for the liquid heat transfer medium to flow; a top end of the inner tube and a top end of the outer tube are both fixed on a beam at an upper part of a frame; the top end of the inner tube passes through the beam of the frame to connect the output tube of the heating mechanism; the top end of the outer tube passes through a plurality of thin tubes embedded in the beam of the frame to connect the input tube of the heating mechanism; thus, a closed heating circulation loop is formed, where the heat transfer medium enters from the inner tube and exits from the outer tube.

The bottom plate is pulled by the plurality of reinforcing ribs; the plurality of reinforcing ribs are respectively released by a release mechanism provided at the top of the device, and then pass vertically downward through the punch to connect the bottom plate.

The plurality of reinforcing ribs are evenly embedded in the board blank, and each reinforcing rib is kept at a distance from the holes and an outer surface of the board blank.

A device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard includes a molding cavity, a plurality of inner molding tubes and a punch, where the molding cavity is provided vertically, and has a rectangular cross section; the molding cavity is provided with an opening on the top and at the bottom, respectively; the plurality of inner molding tubes are vertically arranged in a straight line in the molding cavity; top ends of the inner molding tubes are fixed on a beam on an upper part of a frame; the punch is adapted to a shape of the cross section of the molding cavity, and is able to be driven by an actuating mechanism to move up and down in the molding cavity; the molding cavity is enclosed by two molding plates keeping a parallel distance in a thickness direction of the molding cavity and two thickness gauges provided at both sides of the molding cavity in a width direction; the punch is in a movable fit with the inner molding tubes through a plurality of sliding holes vertically provided thereon; the molding plates are provided therein with a heating tube connected to a heating mechanism; the frame is further provided with a feeding device for feeding wood/bamboo particles into the molding cavity; the inner molding tubes are double-layer heating tubes connected to a heating mechanism; the heating mechanism is located outside the device, and connected to an input tube and an output tube on the top of the inner molding tubes to form a loop for circulating a liquid heat transfer medium.

In the double-layer heating tube, an outer diameter of an inner tube is smaller than an inner diameter of an outer tube; a bottom end of the outer tube is closed, and a bottom end of the inner tube is open and kept at a distance from the bottom end of the outer tube for the liquid heat transfer medium to flow; a top end of the inner tube and a top end of the outer tube are both fixed on a beam at an upper part of a frame; the top end of the inner tube passes through the beam of the frame to connect the output tube of the heating mechanism; the top end of the outer tube passes through a plurality of thin tubes embedded in the beam of the frame in sequence to connect an input tube of the heating mechanism; the plurality of thin tubes pass through a closed ring between the outer tube and the inner tube to enter a space between the inner tube and the outer tube; thus, a closed heating circulation loop is formed, where the heat transfer medium enters from the inner tube and exits from the outer tube and the plurality of thin tubes.

The heating mechanism is a heat conduction oil heater, or a steam heating boiler, or a centralized steam heating system.

A wall surface of the molding cavity is provided with a plurality of vertical protrusions, which correspond to grooves on a surface of the wood/bamboo molded hollow wallboard to increase a surface decoration effect of the wood/bamboo molded hollow wallboard.

A bottom plate is further horizontally provided under the punch; the bottom plate is able to move up and down in the molding cavity; a peripheral shape of the bottom plate is adapted to a cross-sectional contour of the molding cavity; the bottom plate is provided with a plurality of sliding holes that are in a slidable fit with the inner molding tubes; the bottom plate and die punch are respectively provided with a plurality of through holes; the plurality of reinforcing ribs pass through the through holes on the punch from top to bottom, and then are fixed on the bottom plate in a single direction; the plurality of reinforcing ribs are respectively gradually released by a release mechanism provided on the top of the frame.

Two ends of the punch are vertically slidably positioned on pillars on the frame through a vertical guide rail mechanism; the guide rail mechanism includes a plurality of vertical guide rails provided on the pillars at two sides of the frame and a plurality of sliders fixed on a periphery of the punch and fit with the vertical guide rails.

The present invention has the following beneficial effects. In the present invention, a heating device is connected to inner molding tubes. In operation, molding plates and the inner molding tubes use dual heat sources to heat a board blank in a molding cavity from outside to inside at the same time, realizing rapid heating of any part of the board blank, and completely eliminating the heating blind zone (where the heat cannot reach). Therefore, as long as the design thickness of any part of the board blank does not exceed 5 cm, wallboards of any thickness can be produced by increasing the diameter of the inner molding tubes. The present invention completely solves the problem that it is impossible to use heat-insulating wood to produce boards with a thickness of more than 5 cm. The present invention breaks through the development restriction of Chinese wood building industry, and provides a suitable high-performance wallboard. The wallboard has great economic and social value for promoting China's wood building industry to catch up with the advanced level of developed countries in the world.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front view of a device for a method according to the present invention.

FIG. 2 is a structural view after molding plates and thickness gauges shown in FIG. 1 are removed.

FIG. 3 is a structural view after a punch, a bottom plate and reinforcing ribs shown in FIG. 1 are removed.

FIG. 4 is a structural view of a molding cavity shown in FIG. 1.

FIG. 5 is a left view of FIG. 1. FIG. 6 is a left view of FIG. 2. FIG. 7 is a left view of FIG. 3. FIG. 8 is a top view of FIG. 1. FIG. 9 is a top view of FIG. 2. FIG. 10 is a top view of FIG. 3. FIG. 11 is a front view of the punch. FIG. 12 is a top view of FIG. 11.

FIG. 13 shows a connection relationship between the bottom plate and the reinforcing ribs. FIG. 14 is a top view of FIG. 13.

FIG. 15 is a top view of FIG. 4.

FIG. 16 is a three-dimensional structural view of a reinforcing rib release mechanism. FIG. 17 is a structural view of a Lightening ring fixed at a bottom end of a reinforcing rib.

FIG. 18 is a first schematic view of an operating state (feeding wood/bamboo particles) of the method according to the present invention FIG. 19 is a second schematic view of an operating state (punching the wood/bamboo particles by the punch) of the method according to the present invention.

FIG. 20 is a left view of FIG. 18.

FIG. 21 shows a connection relationship between a double-layer tube and a heating mechanism according to the present invention.

FIG. 22 is a front view of the device according to the present invention. FIG. 23 is a right view of the device according to the present invention. FIG. 24 is an S-S sectional view of FIG. 21.

FIG. 25 is a structural view after a feeding device shown in FIG. 21 is removed (the reinforcing ribs and inner molding tubes are omitted for clarity).

FIG. 26 is a three-dimensional structural view of a wood/bamboo molded hollowed board. DETAILED DESCRIPTION The technical solutions of the present invention are described in further detail below with reference to the specific examples.

In the present invention, a wood/bamboo molded hollow wallboard K (as shown in FIG. 25) has a flat rectangular outer contour. The wallboard is provided with holes K1 that are arranged along a length direction and penetrate through both ends of wallboard in the length direction. The wallboard is further provided with a plurality of reinforcing ribs K2. The reinforcing ribs have an extension direction consistent with that of the holes. The reinforcing ribs are respectively provided between the holes and under an outer surface of the hollow board, so as to well bond to the hollow board.

The present invention provides a method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard, including the following steps: 1) Drive a punch by an actuating mechanism to move up and down in a molding cavity M along vertical guide rails, so that the punch moves relative to a plurality of inner molding tubes 4 and a plurality of reinforcing ribs 5 which are vertically provided in the molding cavity and are in a movable fit with the punch; allow a heating mechanism to heat a wall portion of the molding cavity and a wall of the inner molding tubes, where the vertical guide rails are provided on pillars on both sides of a frame; top ends of the plurality of inner molding tubes are fixed on a beam on an upper part of the frame.

The molding cavity is enclosed by two molding plates 12 keeping a parallel distance in a thickness direction of the molding cavity and two thickness gauges 2 provided at both ends of the molding cavity in a width direction; the molding cavity is provided with an opening on the top and at the bottom, respectively.

2) Move the punch upwards for a distance away from an upper opening of the molding cavity (as shown in FIG. 18) to open a top inlet (top feeding port) of the molding cavity; enable a feeding device to evenly feed wood/bamboo particles accompanied by glue into thc molding cavity through the top inlet, where the wood/bamboo particles are supported by a bottom plate 1 aftcr falling into the molding cavity.

3) Drive the punch by the actuating mechanism to move downwards and enter the molding cavity to punch the fed wood/bamboo particles, so that the wood/bamboo particles and the reinforcing ribs are combined tightly into a board blank to be heated in the molding cavity; form holes penetrating through the board blank from top to bottom by using the inner molding tubes; move the plurality of reinforcing ribs, the board blank and the bottom plate downwards synchronously for a certain distance (preferably 10-50mm) under pressure, where the plurality of reinforcing ribs are evenly embedded in the board blank, and each reinforcing rib is kept at a distance from the holes and an outer surface of the board blank.

4) Move the punch upwards for a distance away from the upper opening of the molding cavity to open the top inlet of the molding cavity; enable the feeding device to evenly feed the wood/bamboo particles accompanied by the glue into the molding cavity through the top inlet, where the wood/bamboo particles are laid on an upper part of the board blank formed in the above step after falling into the molding cavity; allow the punch to punch the fed particles while the formed board blank is continuously heated at high temperature by the inner wall of the molding cavity and the wall of the inner molding tubes, so that the glue quickly solidifies every time the board blank is subjected to mobile punching.

5) Repeat steps 3) and 4) to perform continuous cyclic operations, that is, feeding, punching and heating the wood/bamboo particles to form a continuously formed board blank; gradually move the board blank downwards out of the molding cavity, to obtain a finished ultra-thick wood/bamboo molded hollow wallboard.

The inner molding tubes are double-layer heating tubes connected to a heating mechanism. The heating mechanism is located outside a device, and forms a loop for circulating a liquid heat transfer medium through a top end of the inner molding tubes.

The present invention further provides a device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard with embedded reinforcing ribs (as shown in FIGS. 21 to 25). Two molding plates 12 and two thickness gauges 2 are vertically fixedly provided on a frame 18 to enclose a vertical molding cavity M with a rectangular cross section. The molding cavity is provided with an opening on the top and at the bottom, respectively. The two molding plates keep a parallel distance in a thickness direction of the molding cavity. The two thickness gauges are provided at both ends of the molding cavity in a width direction to control the thickness of a finished wallboard. The rectangular cross section has the same contour as a cross section of the ultra-thick wood/bamboo molded hollow board. A plurality of cylindrical inner molding tubes 4 are arranged vertically in a straight line and fixed in the molding cavity for forming holes on the hollow wallboard. Upper ends of the inner molding tubes are fixed by a fixed beam 7 on the frame. The size and arrangement of the inner molding tubes are the same as those of the holes on the ultra-thick wood/bamboo molded hollow wallboard.

A punch 3 is provided horizontally and able to be driven by an actuating mechanism to move up and down in the molding cavity. The punch moves up and down in the molding cavity through a guide rail mechanism on pillars at both ends the frame. The guide rail mechanism includes a plurality of vertical guide rails 13 fixed on the pillars of the frame and a plurality of sliders 14 fixed on four corners at an outer periphery of the punch and in a slidable fit with the vertical guide rails. The punch is provided thereon with a plurality of sliding holes 3.1. The sliding holes are vertically arranged, and correspondingly sleeved on the inner molding tubes. A peripheral shape of the punch is adapted to the cross-sectional contour of the molding cavity, so as to avoid interfere in the movable fit between the punch and an inner wall of the molding cavity. The molding plates are provided therein with a heating tube connected to a heating mechanism. The heating mechanism is preferably a heat conduction oil heater, which is omitted in the figure. hi addition, the continuous forming device is provided with a feeding device 17 for feeding wood/bamboo particles into the molding cavity.

The above described is the structure of the existing device for forming a wood/bamboo molded hollow board.

The present invention makes the following improvements. The inner molding tubes are double-layer heating tubes connected to a heating mechanism. The heating mechanism is located outside the device and connected to an input tube and an output tube at the top of the inner molding tubes to form a closed circulation loop for conveying a liquid heat transfer medium.

It can be seen from FIG. 21 that in the double-layer tube, an outer diameter of an inner tube (4-1) is smaller than an inner diameter of an outer tube (4-2). Walls of the two tubes define a flow passage for the liquid heat transfer medium. A bottom end of the outer tube 4-1 is closed, and a bottom end of the inner tube is open and kept at a distance from the bottom end of the outer tube for the liquid heat transfer medium to flow. A top end of the inner tube and a top end of the outer tube are both fixed on a beam 7 of a frame. The top end of the inner tube passes through the beam of the frame to connect the output tube of the heating mechanism. The top end of the outer tube passes through a plurality of thin tubes 7-1 embedded in the beam in sequence to connect the input tube of the heating mechanism. As can be seen in the figure, a closed isolation ring 7-2 is provided between the inner tube and the outer tube, which keeps a distance S of about 100 mm from a surface of a board blank outside. A bottom end of each thin tube passes through the closed isolation ring to connect the outer tube. A top end of each thin tube is fluidly connected with a heat transfer medium header 21, and the heat transfer medium header is connected to the input tube of the heating mechanism through a second connecting tube 20-2. The inner tube passes through the beam to connect the output tube of the heating mechanism through a first connecting tube 20-1. The liquid heat transfer medium (such as heat transfer oil) output by the output tube of the heating mechanism is input from the top end of the inner tube through the first connecting tube, and turns to move upwards from the bottom end of the inner tube to enter the outer tube (to heat the board blank by releasing heat). Then the liquid heat transfer medium enters the heat transfer medium header through the plurality of thin tubes connected on the closed isolation ring, and returns through the second connecting tube to the input tube of the heating mechanism to reheat. In this way, a heating circulation loop of the liquid heat transfer medium is formed.

The closed isolation ring between the inner tube and the outer tube keeps a distance of about 100 mm from an upper part of the board blank outside. The inner molding tubes heat the board blank in a gradient. An initial temperature is 140°C, so that glue on the surface of the board blank that first contacts the inner molding tubes will not solidify immediately, and all parts of the board blank can be fully preheated at the same time. After the heat transfer medium enters the lower part of the inner molding tubes, the heating temperature rises to 160-190°C, and the glue in the board blank starts to solidify quickly. The glue in all parts of the board blank solidifies synchronously to avoid a large internal stress caused by asynchronous solidification.

An inner wall of the molding cavity is adapted to a surface structure of the wood/bamboo molded hollow wallboard. When the surface of the wood/bamboo molded hollow wallboard is designed with a plurality of longitudinal grooves K3, a wall surface of the cavity with a rectangular cross section is provided with corresponding protrusions. In this way, the wood/bamboo molded hollow wallboard obtained by the present invention has a surface decoration effect as designed, and can be directly used without the need to cover with a wood/bamboo veneer.

A horizontal bottom plate 1 is provided under a punch. A peripheral shape of the bottom plate is adapted to a molding cavity. The bottom plate is provided thereon with a plurality of sliding holes 1.1 corresponding to a plurality of inner molding tubes. The sliding holes are sleeved on the plurality of inner molding tubes to form a slidable fit with the inner molding tubes. A peripheral shape of the bottom plate is adapted to a cross-sectional contour of the molding cavity. The bottom plate and the punch are respectively provided thereon with a plurality of through holes. A plurality of reinforcing ribs 5 respectively pass through the through holes 8 on the punch from top to bottom, and then are fixed in the through holes of the bottom plate. FIGS. 13 and 17 show one of methods for fixing the reinforcing ribs. The reinforcing ribs pass downward through the through holes of the bottom plate, and then are fixed by a tightening ring 6. A tightening screw 9 on the tightening ring is tightened towards an inner diameter to press and fix the reinforcing ribs that pass through the tightening ring. Because a diameter of the tightening ring is larger than the through holes of the bottom plate, the reinforcing ribs cannot pass through the through holes of the bottom plate to move upwards, and thus the reinforcing ribs are fixed on the bottom plate in a single direction. In this way, a punching force on the bottom plate is transferred to the reinforcing ribs.

The plurality of reinforcing ribs are gradually released by a plurality of release mechanisms (conventional mechanisms) provided on the frame. Each release mechanism includes a spool 10 wound with one reinforcing rib, a damping mechanism for damping rotation of the spool and a plurality of guide wheels 11 for guiding movement of the reinforcing fib. The damping is performed to cause the reinforcing rib to produce a certain tension. As the simplest damping mechanism, a friction plate is fixed on the frame. One end of the friction plate is pressed against a flange 10.1 of the spool to generate friction. When the punch moves downward to punch the wood/bamboo particles, if the pressure on the bottom plate exceeds a damping force, the reinforcing rib is driven to move downward for a certain distance, that is, the reinforcing rib is naturally released for a certain distance. In this way, the reinforcing rib always maintains a certain tension.

The punch adopts a driving method that is prior art. It can be seen from the figure that both ends of the punch extend out of the frame, and the punch is driven by an actuating mechanism provided on the frame. The actuating mechanism is a crank and slider mechanism driven by a motor 19 through a pulley mechanism. The crank is a connecting rod 15 eccentrically hinged on a punching flywheel 16. A bottom end of the connecting rod is hinged with an end of the punch to convert rotational kinetic energy of the punching flywheel into linear punching kinetic energy. In this way, the punch is driven to slide up and down along the vertical guide rails to punch the wood/bamboo particles fed into the molding cavity. In FIG. 25, a rotating shaft of the punching flywheel is shielded by the upper beam 7.

The reinforcing ribs are preferably flexible reinforcing ribs impregnated with thermosetting resin, and may be metal wire ropes, strong fiber wire ropes, especially aramid fiber reinforced ropes.

As shown in FIG. 24, the feeding device 17 includes an outer shell 17.1 and an inner shell 17.2. The outer shell 17.1 forms an outer wall of the feeding device, and the inner shell covers the punch to isolate the punch from the wood/bamboo particles. A funnel-shaped output port is formed between the outer shell and the inner shell. The output port is aligned with the top opening of the molding cavity. When the punch moves upwards to open the top inlet, the wood/bamboo particles is fed into the molding cavity. The amount of the wood/bamboo particles fed is determined by the size of the top inlet (determined by a distance the punch moves upwards).

Claims

What is claimed is: 1. A method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard, comprising the following steps: 1) driving a punch (3) in a molding cavity (M) by an actuating mechanism to move up and down in a straight line along vertical guide rails, so that the punch moves relative to a plurality of inner molding tubes (4) and a plurality of reinforcing ribs (5) which are vertically provided in the molding cavity and are in a movable fit with the punch; allowing a heating mechanism to heat an inner wall of the molding cavity and a wall of the inner molding tubes; 2) moving the punch upwards for a distance away from an upper opening on a molding plate to open a top inlet of the molding cavity; enabling a feeding device (17) to evenly feed wood/bamboo particles accompanied by glue into the molding cavity through the top inlet, wherein the wood/bamboo particles are supported by a bottom plate ( 1) after falling into the molding cavity; 3) driving the punch by the actuating mechanism to move downwards and enter the molding cavity to punch the fed wood/bamboo particles, so that the wood/bamboo particles and the reinforcing ribs are combined tightly into a board blank to be heated in the molding cavity; moving the board blank together with the bottom plate connected to the bottom of the reinforcing ribs downwards for a plurality of distances; forming holes penetrating through the board blank from top to bottom by using the inner molding tubes; 4) moving the punch upwards for a distance away from the upper opening of the molding cavity to open the top inlet of the molding cavity; enabling the feeding device to evenly feed the wood/bamboo particles accompanied by the glue into the molding cavity through the top inlet, so that the wood/bamboo particles are laid on an upper part of the board blank formed in the above step after falling into the molding cavity; allowing the punch to punch the fed particles while the formed board blank is heated from outside to inside at high temperature by the wall of the molding cavity and the wall of the inner molding tubes, so that the glue quickly solidifies every time the board blank is subjected to mobile punching; and 5) repeating steps 3) and 4) to perform continuous cyclic operations, that is, feeding, punching and heating the wood/bamboo particles to form a continuously formed board blank; gradually moving the board blank downwards out of the molding cavity, to obtain a finished wood/bamboo molded hollow wallboard (C); wherein, the molding cavity is enclosed by two molding plates (12) keeping a distance in a thickness direction of the cavity and two thickness gauges (2) provided at both ends of the cavity in a width direction; the molding cavity is provided with an opening on the top and at the bottom, respectively; the inner molding tubes are double-layer heating tubes connected to a heating mechanism; the heating mechanism is located outside a device, and provided with an input tube and an output tube on the top of the inner molding tubes to form a loop for circulating a liquid heat transfer medium.
2. The method for continuously forming an ultra-thick wood/bamboo molded hollow wallboard according to claim 1, wherein in the double-layer heating tube, an outer diameter of an inner tube (4-1) is smaller than an inner diameter of an outer tube (4-2); a bottom end of the outer tube is closed, and a bottom end of the inner tube is open and kept at a distance from the bottom end of the outer tube for the liquid heat transfer medium to flow; a top end of the inner tube and a top end of the outer tube are both fixed on a beam (7) at an upper part of a frame; the top end of the inner tube passes through the beam of the frame to connect the output tube (20-1) of the heating mechanism; the top end of the outer tube passes through a plurality of thin tubes (7-1) embedded in the beam of the frame to connect the input tube (20-2) of the heating mechanism; thus, a closed heating circulation loop is formed, where the heat transfer medium enters from the inner tube and exits from the outer tube.
3. The method for continuously forming an ultra-thick wood/bamboo wallboard according to claim 2, wherein the bottom plate is pulled by the plurality of reinforcing ribs; the plurality of reinforcing ribs are respectively released by a release mechanism provided at the top of the device, and then pass vertically downward through the punch to connect the bottom plate.
4. The method for continuously forming an ultra-thick wood/bamboo wallboard according to claim 3, wherein the plurality of reinforcing ribs are evenly embedded in the board blank, and each reinforcing rib is kept at a distance from the holes and an outer surface of the board blank.
5. A device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard, comprising a molding cavity (M), a plurality of inner molding tubes (4) and a punch (3), wherein the molding cavity is provided vertically, and has a rectangular cross section; the molding cavity is provided with an opening on the top and at the bottom, respectively; the plurality of inner molding tubes are vertically arranged in a straight line in the molding cavity; top ends of the inner molding tubes are fixed on a beam on an upper part of a frame; the punch is adapted to a shape of the cross section of the molding cavity, and is able to be driven by an actuating mechanism to move up and down in the molding cavity; the molding cavity is enclosed by two molding plates (12) keeping a parallel distance in a thickness direction of the molding cavity and two thickness gauges (2) provided at both sides of the molding cavity in a width direction; the punch is in a movable fit with the inner molding tubes through a plurality of sliding holes vertically provided thereon; the molding plates are provided therein with a heating tube connected to a heating mechanism; the frame is further provided with a feeding device (17) for feeding wood/bamboo particles into the molding cavity; the inner molding tubes are double-layer heating tubes connected to a heating mechanism; the heating mechanism is located outside the device, and connected to an input tube and an output tube on the top of the inner molding tubes to form a loop for circulating a liquid heat transfer medium.
6. The device for continuously forming an ultra-thick wood/bamboo wallboard according to claim 5, wherein in the double-layer heating tube, an outer diameter of an inner tube (4-1) is smaller than an inner diameter of an outer tube (4-2); a bottom end of the outer tube is closed, and a bottom end of the inner tube is open and kept at a distance from the bottom end of the outer tube for the liquid heat transfer medium to flow; a top end of the inner tube and a top end of the outer tube are both fixed on a beam (7) at an upper part of a frame; the top end of the inner tube passes through the beam of the frame to connect the output tube (20-1) of the heating mechanism; the top end of the outer tube passes through a plurality of thin tubes embedded in the beam of the frame in sequence to connect an input tube (20-2) of the heating mechanism; the plurality of thin tubes pass through a closed ring (7-2) between the outer tube and the inner tube to enter a space between the inner tube and the outer tube; thus, a closed heating circulation loop is formed, where the heat transfer medium enters from the inner tube and exits from the outer tube and the plurality of thin tubes.
7. The device for continuously foiming an ultra-thick wood/bamboo wallboard according to claim 6, wherein the heating mechanism is a heat conduction oil heater, or a steam heating boiler, or a centralized steam heating system.
8. The device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard according to claim 7, wherein a wall surface of the molding cavity is provided with a plurality of vertical protrusions, which correspond to grooves (K3) on a surface of the wood/bamboo molded hollow wallboard to increase a surface decoration effect of the wood/bamboo molded hollow wallboard.
9. The device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard according to claim 8, wherein a bottom plate (1) is further horizontally provided under the punch; the bottom plate is able to move up and down in the molding cavity; a peripheral shape of the bottom plate is adapted to a cross-sectional contour of the molding cavity; the bottom plate is provided with a plurality of sliding holes that arc in a slidablc fit with the inner molding tubes; the bottom plate and the punch are respectively provided with a plurality of through holes; the plurality of reinforcing ribs (5) pass through the through holes on the punch from top to bottom, and then are fixed on the bottom plate in a single direction; the plurality of reinforcing ribs are respectively gradually released by a release mechanism provided on the top of the frame.
10. The device for continuously forming an ultra-thick wood/bamboo molded hollow wallboard according to claim 9, wherein two ends of the punch are vertically slidably positioned on pillars on the frame through a vertical guide rail mechanism; the guide rail mechanism comprises a plurality of vertical guide rails (13) provided on the pillars at two sides of the frame and a plurality of sliders (14) fixed on a periphery of the punch and fit with the vertical guide rails.