A lightweight flame-retardant fiberboard production system with a flame-retardant foam ball spraying device

Abstract

The present invention provides a lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device, which includes a fiber laying device, a shunt device, and a spraying device. The slab conveyor belt of the fiber laying device is arranged at the bottom of the laying bin and extends outside the outlet of the laying bin. The leveling roller is arranged at the outlet of the laying bin and above the slab conveyor belt; short bundle teeth and long bundle teeth are distributed on the leveling roller; the spraying device includes a pneumatic conveying component, a spraying component, and a return air collection component. The spraying component is located in the laying bin, and is erected above the slab conveyor belt and below the discharge port of the fiber feeding bin. The spraying component includes a spraying pipe, a plurality of foaming ball acceleration pipes, and a plurality of foaming ball nozzles. The foaming ball nozzles are penetrated on the spraying pipe, and the setting positions of the long bundle teeth on the leveling roller correspond to the respective foaming ball nozzles. The lightweight flame-retardant fiberboard produced by the present invention has a balanced density and is not easily deformed, and can meet the physical and mechanical property indexes of the board and the requirements of the flame-retardant board type under the same production process conditions.

Description

Technical Field

[0001] The present invention relates to a production system for lightweight flame-retardant fiberboards with a flame-retardant foam ball spraying device.

Background Art

[0002] Fiberboard is a kind of artificial board mainly made of wood fiber or other plant fibers. After fiber preparation, adhesives are applied, and the fibers are dried and then paved and formed, and then made by hot pressing. Classified by bulk density, fiberboards can be divided into high-density fiberboards, medium-density fiberboards, and low-density fiberboards. Due to the uniform material of fiberboards, they are widely used in the processing of furniture, floors, wall panels, packaging boxes, ceilings, etc. After more than 40 years of development of fiberboard manufacturing technology, the production process technology has reached its limit and cannot significantly improve the physical and mechanical properties of fiberboard sheets. Especially in the development of lightweight fiberboards at low density, it is impossible to produce high-performance flame-retardant boards with a density less than 500 kg / M3.

[0003] With the improvement of living standards, people's safety awareness has also increased. Medium and low-density fiberboards not only need to meet the original physical and mechanical indicators, but also need to have sufficient flame-retardant ability and lightness. In the production of existing flame-retardant lightweight fiberboards, lightweight flame-retardant boards with a density of 450 kg / m 3 -490 kg / m 3 are difficult to prepare. The main reason is that in this density range, the physical and mechanical properties of the board are positively correlated with the board density. At the same time, due to the relatively large density of the flame retardant, it is more difficult to reduce the board density. The existing solution is to uniformly add a flame retardant and a flame-retardant foam agent to the dry fibers after sizing and drying to reduce the average density of the fiberboard.

[0004] The defect of this method is that the surface sanding layer of the fiberboard contains foam ball particles. After sanding off the pre-cured layer on the surface with foam ball particles, large-area irregular pits appear on the board, affecting the subsequent decoration and aesthetics of the board. To solve this problem, the existing method is to use a two-layer fiber paving method, laying the foam balls in the middle, which solves the problem that the fiber sanding surface layer contains foam ball particles, but there are still two problems. One is that since the middle layer is foam balls, it causes the board to be hollow and the physical and mechanical property indicators such as the lateral nail-holding force are insufficient; the other is that when the foam ball particles overlap or the particle sizes are uneven, the fiber layer density of the fiberboard sheet is seriously unbalanced, easily causing the board to deform. There is no device that combines the application of a foam ball particle spraying device and fiber paving on the market, so that the foam ball particles can be sprayed to each cross-section position of the fiberboard cross-section layer to reduce the board density.

Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a lightweight flame-retardant fiberboard production system with a flame-retardant foam ball spraying device, the lightweight flame-retardant fiberboard produced by which has a balanced density and is not easily deformed, and can meet the physical and mechanical property indexes of the board and the requirements of the flame-retardant board type under the same production process conditions.

[0006] The present invention is implemented as follows:

[0007] A lightweight flame-retardant fiberboard production system with a flame-retardant foam ball spraying device includes a fiber laying device, a foam ball shunt device, and a spraying device. The fiber laying device includes a fiber feeding bin, a discharge conveyor belt, a dispersing roller, a laying bin, a slab conveyor belt, and a leveling roller. The discharge conveyor belt is arranged at the bottom of the fiber feeding bin. The dispersing roller is arranged at the discharge port of the fiber feeding bin. The slab conveyor belt is arranged at the bottom of the laying bin and extends outside the outlet of the laying bin. The leveling roller is arranged at the outlet of the laying bin and above the slab conveyor belt. Short bundle teeth and long bundle teeth are distributed on the leveling roller, and the length of the long bundle teeth is longer than that of the short bundle teeth.

[0008] The shunt device includes a foam ball bin, a screw feeder, a distribution bin, and a foam ball feeding pipe. A screw feeder is arranged at the outlet of the foam ball bin. The outlet of the screw feeder is arranged above the distribution bin. The foam ball feeding pipe is connected to the lower part of the distribution bin.

[0009] A material dividing plate, a distribution plate, a plurality of metering bins, and a flow limiting plate are sequentially arranged in the distribution bin from top to bottom. First through holes are distributed on the distribution plate, and the inlets of the metering bins are communicated with the corresponding first through holes. Second through holes are distributed on the flow limiting plate, and the outlets of the metering bins are communicated with the corresponding second through holes. The lower ends of the second through holes are connected to the corresponding foam ball feeding pipes.

[0010] The spraying device includes a pneumatic conveying component, a spraying component, and a return air collection component. The pneumatic conveying component includes a fan, an air box, a pneumatic conveying hose, and an air volume regulating valve. The fan is connected to the air inlet of the air box. A plurality of pneumatic conveying pipes are connected to the air outlet of the air box, and an air volume regulating valve is arranged on each pneumatic conveying pipe. A foam ball feeding pipe is connected to the middle of each pneumatic conveying hose.

[0011] The spraying assembly is located inside the paving bin, and is mounted above the slab conveyor belt and below the discharge port of the fiber feeding bin. The spraying assembly includes a spraying pipe, a plurality of foaming ball accelerating pipes, and a plurality of foaming ball nozzles. Each of the foaming ball accelerating pipes is arranged inside the spraying pipe, and the space formed between the inner wall and the outer wall of the spraying pipe is a return air collecting chamber; one end of each of the foaming ball accelerating pipes is respectively connected to a corresponding pneumatic conveying hose, each of the foaming ball nozzles is penetrated through the spraying pipe, the inlet of each of the foaming ball nozzles is connected to the corresponding foaming ball accelerating pipe, and the outlet of each of the foaming ball nozzles extends to the outside of the spraying pipe; and a plurality of air vent holes are distributed on the pipe wall of each of the foaming ball nozzles; bearings are sleeved at both ends of the spraying pipe, and both of the bearings are fixed on the trolley; a swing device is further connected to the end of the spraying pipe.

[0012] The setting position of the long bundle teeth on the leveling roller corresponds to each of the foaming ball nozzles;

[0013] The return air collecting assembly includes a return air collecting pipe, a return air main pipe, a return air valve, an air inlet pipe, and an air inlet valve. The return air collecting pipe is communicated with the return air collecting chamber, and the other end of the return air collecting pipe is connected to the return air main pipe. The return air main pipe is connected to the middle of the air inlet pipe. The outlet end of the air inlet pipe is connected to a fan. The return air valve is arranged on the return air main pipe, and the air inlet valve is arranged at the inlet end of the air inlet pipe.

[0014] Further, the length of the long bundle teeth is 40 - 60 mm longer than the length of the short bundle teeth.

[0015] Further, a vibrator is further arranged outside the distribution bin.

[0016] Further, a first handle is arranged at one end of the distribution plate, and a second handle is arranged at one end of the flow limiting plate; two installation grooves are arranged inside the distribution bin, one end of each of the installation grooves penetrates through the side wall of the distribution bin, the distribution plate and the flow limiting plate are detachably arranged in the installation grooves, and the first handle and the second handle extend outside the side wall of the distribution bin.

[0017] Further, each of the metering bins includes a cylindrical upper part and a conical lower part arranged up and down, and the inlet diameter of the metering bin is larger than the outlet diameter of the metering bin.

[0018] Further, chamfers are arranged on the upper and lower edges of the first through hole and the upper edge of the second through hole; the diameter of the first through hole is 3 - 5 mm, and the diameter of the second through hole is 3 - 4 mm.

[0019] Further, the maximum angle at which the spraying pipe can rotate back and forth along the bearings at both ends is 15°.

[0020] Furthermore, the angle between each of the foaming ball nozzles and the perpendicular line of the spray pipe is -110° to +110°.

[0021] Furthermore, the length of each of the foaming ball nozzles increases successively from bottom to top along the spraying pipe, so that the foaming balls sprayed from the foaming ball nozzles have different depths in the fiberboard and are arranged in a continuous V-shaped curve.

[0022] Furthermore, a fiber splitter cover is arranged above the spray pipe.

[0023] The present invention has the following advantages:

[0024] 1. The light flame-retardant fiberboard produced by the system of the present invention has a balanced fiber layer density under the same production process conditions, is not easy to deform, and can achieve physical and mechanical performance indicators such as the side nail holding force of the board, and the light flame retardant meets the requirements of Class B and Class C flame retardant boards specified in the national GB8624-2006 "Classification of Combustion Performance of Building Materials and Products" standard. That is, the performance requirements for use in a dry state in the light fiberboard industry standard for light fiberboards at a density of 450 to 490 kg / m3, and also meets the requirements of light flame retardant and national Class C flame retardant fireproof boards.

[0025] 2. The flame-retardant foam ball spraying device of the present invention can control the foam balls to spray at various cross-sectional positions of the fiberboard cross-sectional layer, thereby reducing the density of the board. It can also realize continuous spraying of the foam balls in the front, back, and bottom angles, flat shooting, parabolic shooting, left and right moving sweeping, free fall, and downward semicircular manners. The positions of the foam particles in the cross-sectional area of ​​the board are not in a straight line, which enhances the side nail holding force of the board, and the board is not easy to deform; and the board will not have large-area irregular pits, which will not affect the subsequent decoration and appearance of the board.

Brief Description of the Drawings

[0026] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0027] Figure 1 The schematic diagram of a lightweight flame retardant fiberboard production system with a flame retardant foam ball spraying device according to the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of the leveling roller of the present invention.

[0029] Figure 3 It is a schematic structural diagram of the coordination of the diverter device and the spraying device of the present invention.

[0030] Figure 4 It is a side view of the spray assembly of the present invention.

[0031] Figure 5 It is a cross-sectional view of the foaming ball nozzle of the present invention.

[0032] Figure 6 This is a schematic structural view of the material distribution plate of the present invention.

[0033] Figure 7 This is a cross-sectional view of the distribution plate of the present invention.

[0034] Figure 8 This is a schematic top view structural view of the distribution plate of the present invention.

[0035] Figure 9 This is a schematic structural view of the current-limiting plate of the present invention.

[0036] Figure 10 This is a side view of the dry fiberboard blank produced by the present invention.

[0037] Figure 11 This is an effect diagram of the grooves being filled after the foaming balls in the dry fiberboard blank produced by the present invention expand by foaming.

Detailed Embodiment

[0038] Refer to Figures 1-11 , the present invention relates to a lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device, including a fiber paving device 1, a foaming ball diversion device 2, and a spraying device 3. The fiber paving device includes a fiber feeding bin 11, a discharge conveyor belt 12, a dispersing roller 13, a paving bin 14, a board blank conveyor belt 15, and a leveling roller 16. The discharge conveyor belt 12 is arranged at the bottom of the fiber feeding bin 11, and a paving rake 17 is further arranged above the discharge conveyor belt 12. A plurality of the dispersing rollers 13 are arranged at the discharge port of the fiber feeding bin 11. The board blank conveyor belt 15 is arranged at the bottom of the paving bin 14 and extends outside the outlet of the paving bin 14. The leveling roller 16 is arranged at the outlet of the paving bin 14 and above the board blank conveyor belt 15; short bundle teeth 161 and long bundle teeth 162 are distributed on the leveling roller 16, and the length of the long bundle teeth 162 is longer than that of the short bundle teeth 161; the length of the long bundle teeth 162 is 40 - 60 mm longer than the length of the short bundle teeth 161.

[0039] The foaming ball diversion device 2 includes a foaming ball bin 21, a screw feeder 22, a distribution bin 23, and a foaming ball feeding pipe 24. A screw feeder 22 is arranged at the outlet of the foaming ball bin 21, the outlet of the screw feeder 22 is arranged above the distribution bin 23, and the foaming ball feeding pipe 24 is connected to the current-limiting plate 234 below the distribution bin 23;

[0040] Inside the distribution bin 23, a material distribution plate 231, a distribution plate 232, a plurality of metering bins 233, and a flow limiting plate 234 are sequentially arranged from top to bottom. First through holes 2321 are distributed on the distribution plate 232, and the inlets of the metering bins 233 communicate with the corresponding first through holes 2321; second through holes 2341 are distributed on the flow limiting plate 234, and the outlets of the metering bins 233 communicate with the corresponding second through holes 2341; the lower ends of the second through holes 2341 communicate with the corresponding foaming ball feeding pipes 24.

[0041] The spraying device 3 includes a pneumatic conveying assembly 31, a spraying assembly 32, and a return air collection assembly 33. The pneumatic conveying assembly 31 includes a fan 311, an air box 312, pneumatic conveying hoses 313, and air volume regulating valves 314. The fan 311 is connected to the air inlet of the air box 312. A plurality of pneumatic conveying pipes 313 are connected to the air outlet of the air box 312, and air volume regulating valves 314 are provided on each of the pneumatic conveying pipes 313; a foaming ball feeding pipe 24 is connected to the middle of each of the pneumatic conveying hoses 313.

[0042] The spraying assembly 32 is located inside the paving bin 14, and is erected above the slab conveyor belt 15 and below the discharge port of the fiber feeding bin 11. The spraying assembly 32 includes a spraying pipe 321, a plurality of foaming ball accelerating pipes 322, and a plurality of foaming ball nozzles 323. Each of the foaming ball accelerating pipes 322 is arranged inside the spraying pipe 321. The space formed between the inner wall and the outer wall of the spraying pipe 321 is a return air collection chamber 3211; one end of each of the foaming ball accelerating pipes 322 is respectively connected to the corresponding pneumatic conveying hose 313. Each of the foaming ball nozzles 323 penetrates through the spraying pipe 321. The inlet of each of the foaming ball nozzles 323 is connected to the corresponding foaming ball accelerating pipe 322, and the outlet of each of the foaming ball nozzles 323 extends to the outside of the spraying pipe 321; threads (not shown in the figure) are provided on the inner wall and the outer wall of the through hole of the spraying pipe 321 where the foaming ball nozzle 323 penetrates. Two sets of screw teeth 3231 corresponding to the threads are provided on each of the foaming ball nozzles 323, and the spraying pipe 321 and each of the foaming ball nozzles 323 are connected by the threads and the screw teeth 3231; the inlets of the foaming ball nozzles 323 and the corresponding foaming ball accelerating pipes 322 are respectively connected by universal ball joints 3232.

[0043] And a plurality of air vent holes 3233 are distributed on the pipe wall of each of the foaming ball nozzles 323; the diameter of the air vent holes 3 is smaller than the smallest diameter of the foaming balls, usually 1 mm - 1.5 mm; bearings 324 are sleeved at both ends of the spraying pipe 321, and the two bearings 324 are both fixed on the trolley 325; a swing device 326 is further connected to the end of the spraying pipe 321; the swing device 326 cooperates with the bearings 324 to control the spraying pipe 321 to rotate back and forth along the bearings 324 at both ends.

[0044] The setting position of the long-beam teeth 162 on the leveling roller 16 corresponds to each of the foam ball nozzles 323;

[0045] The return air collection assembly 33 includes a return air collection pipe 331, a return air main pipe 332, a return air valve 333, an air inlet pipe 334, and an air inlet valve 335. The return air collection pipe 331 is communicated with the return air collection chamber 3211, and the other end of the return air collection pipe 331 is connected to the return air main pipe 332. The return air main pipe 332 is connected to the middle of the air inlet pipe 334. The outlet end of the air inlet pipe 334 is connected to the fan 311. The return air valve 333 is arranged on the return air main pipe 332, and the air inlet valve 335 is arranged at the inlet end of the air inlet pipe 334.

[0046] A vibrator (not shown in the figure) is further arranged outside the distribution bin 23. With the vibration of the vibrator, the foam balls in the distribution bin 23 can be driven to vibrate, avoiding the bridging and uneven distribution of the foam balls in the distribution bin.

[0047] The distribution plate 231 includes a distribution material plate 2311 and adjusting rods 2312 horizontally penetrating the distribution material plate 2311. The two ends of the adjusting rods 2312 are rotatably arranged on the side walls of the distribution bin 23. By rotating the adjusting rods 2312, the distribution material plate 2311 is rotated to control the cloth distribution conditions on the front and back sides, preventing uneven cloth distribution.

[0048] A first handle 2322 is arranged at one end of the distribution plate 232, and a second handle 2342 is arranged at one end of the current-limiting plate 234; Two installation grooves (not shown in the figure) are arranged in the distribution bin 23. One end of each installation groove penetrates the side wall of the distribution bin 23. The distribution plate 232 and the current-limiting plate 234 are detachably arranged in the installation grooves, and the first handle 2322 and the second handle 2342 extend outside the side wall of the distribution bin 23; The first handle 2322 and the second handle 2342 are used for the installation, replacement, and use of the distribution plate 232 and the current-limiting plate 234, that is, replacing the distribution plate 232 and the current-limiting plate 234 with different diameters of through holes according to actual conditions;

[0049] Each metering bin 233 includes a cylindrical upper part and a conical lower part arranged up and down, and the inlet diameter of the metering bin 233 is larger than the outlet diameter of the metering bin. Each metering bin 233 is used for receiving and storing foam balls.

[0050] Chamfers are arranged on the upper and lower edges of the first through hole 2321 and the upper edge of the second through hole 2341 to facilitate the smooth entry of the foam balls; The diameter of the first through hole 2321 is 3-5 mm, and the diameter of the second through hole 2341 is 3-4 mm.

[0051] The maximum angle at which the spraying pipe 321 can rotate back and forth along the bearings 324 at both ends is 15° (i.e., the maximum angle of rotation back and forth is 15°). The angle between each foaming ball nozzle 323 and the perpendicular bisector L of the spraying pipe 321 is from -110° to +110° (i.e., with the lowest point of the perpendicular bisector L as 0°, counterclockwise as the positive angle, and clockwise as the negative angle). The lengths of the foaming ball nozzles 323 increase successively from bottom to top along the spraying pipe 321. That is, according to the positions of the foaming balls in the dry fiber board blank in actual production requirements, the angle of the spraying pipe 321 rotating back and forth along the bearings 324 at both ends, the angle between each foaming ball nozzle 323 and the perpendicular bisector of the spraying pipe 321, and the lengths of the foaming ball nozzles 323 are adjusted.

[0052] A fiber shunt cover 327 is arranged above the spraying pipe 321 to shunt the dry fibers falling above the spraying pipe 321 to both sides of the spraying pipe 321.

[0053] The fiber shunt cover 327 above the spraying pipe 321 divides the continuous dry fiber blanking at the discharge port of the fiber blanking bin 11 into two parts of fibers. The fibers at the right outlet are the lower surface paving fibers for conventional paving; the fibers at the left outlet are the upper surface paving fibers for conventional paving. The flame-retardant foaming balls are sprayed onto the positions in the dry fiber board blank at the angles where the foaming ball nozzles 323 are located, and finally present as Figure 10 shown (the depths of the foaming balls 100 in the dry fiber board blank 200 are different and are arranged in a continuous V-shaped curve). The distance h2 from the bottom foaming ball 100 to the bottom in the dry fiber board blank 200 is greater than or equal to 20 mm. The distance h1 from the top foaming ball 100 to the top edge of the dry fiber board blank 200 at the highest point is greater than or equal to 70 mm.

[0054] In the present invention, multiple means three or more, and the numbers of the first through hole 2321, the metering bin 233, the second through hole 2341, the blanking pipe 24, the pneumatic conveying hose 314, the foaming ball acceleration pipe 322, the foaming ball nozzle 323, and the long bundle teeth 162 correspond to each other.

[0055] The working process of the present invention is as follows:

[0056] 1. Preparation before starting up

[0057] The dry fiber board blank conveyor belt 15 runs, the paving rake 17, the discharge conveyor belt 12, and the fiber dispersing rollers 13 (multiple) wait for starting up, and the dry fiber inlet of the fiber blanking bin 11 starts to blank (i.e., fibers, and the fibers used in production are dry fibers containing flame retardants).

[0058] The trolley 325 below the spraying pipe 321 runs, and the spraying pipe 321 with multiple foaming ball nozzles is placed below the discharge port of the paving bin 14, ready to spray foaming ball particles.

[0059] The foamed ball granular raw material (the foamed ball granules are post-foamed flame-retardant polystyrene granules) is poured into the foamed ball storage bin 21. The air volume regulating valves 314 of each of the pneumatic conveying hoses 313 are opened, the return air valve 333 and the air inlet valve 335 of the return air collection assembly 33 are opened, and the fan 311 is started to establish the return air working state; the distribution plate 231 is adjusted to select a distribution plate 232 and a flow limiting plate 234 with a suitable through-hole diameter. The vibrator is turned on, and the bottom edge of the discharge port of the screw feeder 22 is slidably and sealingly connected to the feed inlet of the distribution bin 23. The trolley 325 moves slowly left and right, and the swing device 326 works, causing the spraying pipe 321 to slowly rotate in a circumferential direction before and after within the bearing 324, with a maximum angle of 15° of rotation before and after. The leveling roller 16 equipment is started and operated.

[0060] 2. Startup:

[0061] The paving rake 17, the discharge conveyor belt 12, and the fiber dispersing roller 13 are started and operated. The dry fiber inlet of the fiber feeding bin 11 starts to continue feeding, and the discharge port of the fiber feeding bin 11 continuously discharges materials. The screw feeder 22 operates, and the foamed ball raw material falls from the discharge port of the screw feeder 22, enters the distribution bin 23 of the flame-retardant foamed ball, is adjusted and distributed by the distribution plate 231, then falls to the distribution plate 232, and is evenly distributed to a plurality of metering bins 233 below through screening by the distribution plate 232. Then, limited by the flow limiting plate 234 below, the foamed balls fall into the feed pipe 24. Under the mixing of the suction air of the return air collection assembly 33 and the pressurized air blown by the air box 312, the foamed balls are accelerated in the pneumatic conveying hose 313 and the foamed ball acceleration air pipe 322, and finally are blown out from the outlet of the foamed ball nozzle 323.

[0062] The fiber diversion cover 327 above the spraying pipe 321 divides the continuous dry fiber falling from the discharge port of the fiber feeding bin 11 into two parts of fibers. The fibers at the right outlet are the lower surface paving fibers for conventional paving; the fibers at the left outlet are the upper surface paving fibers for conventional paving. The flame-retardant foamed balls are sprayed onto the position in the dry fiber slab in a large area at the angle where the foamed ball nozzle 323 is located, and finally are in the shape as Figure 10 shown (the depths of the foamed balls 100 in the dry fiber slab 200 are different and are arranged in a continuous V-shaped curve). The distance h2 from the bottom foamed ball 100 to the bottom in the dry fiber slab 200 is greater than or equal to 20 mm. The distance h1 from the top foamed ball 100 to the highest point from the upper edge of the top of the dry fiber slab 200 is greater than or equal to 70 mm.

[0063] The foamed ball 100 is a post-foamed flame-retardant polystyrene particle ball and is foamed under high temperature and high pressure in a hot press. The leveling roller 16 is used to rake and remove the excess dry fibers on the slab on the slab conveyor belt 15, and the long bundle teeth 162 thereof correspond to the laying device of the flame-retardant foamed ball 100, and are used to rake and remove the excess wood fibers above the position of the foamed ball 100 to form a groove 201, asFigure 10 As shown, the depth h3 of the groove 201 is 40 - 60 mm, so that the amount of fiber paving in the vertical direction of the flame-retardant foaming ball particles is less than that on both sides, and the pressure is less. When foaming in the press, it is mainly guided to foam in the vertical direction. When the flame-retardant foaming ball particles expand by foaming, the groove 201 at this place can be filled, as Figure 11 shown.

[0064] The leveling roller 16 is arranged to move left and right (not shown in the figure), and the left and right moving distance is equal to the left and right moving distance of the foaming ball nozzle 323, and there is a fixed time lag of t = distance from the spraying pipe to the leveling roller / speed of the slab conveyor belt.

[0065] Due to the slow left and right movement of the trolley 325, the oscillator 326 works, so that the spraying pipe 321 with multiple foaming ball nozzles 323 slowly swings back and forth at an angle of 0 - 15° in the bearing 324. At the same time, by adjusting the size of the wind force, the flame-retardant foaming balls 100 can be continuously ejected from each foaming ball nozzle 323, and can be continuously ejected from each foaming ball nozzle 323 at different angles, different wind pressures and different positions and enter the dry fiber slab 200. The return air collection chamber 3211 collects the excess gas ejected from the air vent holes 3233 of each foaming ball nozzle 323, and passes through the return air collection pipe 331, through the return air main pipe 332 and the return air valve 333 and enters the fan 311.

[0066] The paved slab with post-foaming particles is transported to the subsequent pre-pressing, hot-pressing and rough board treatment steps for production and treatment.

[0067] Shutdown: The screw discharge machine 22 stops, and the feeding stops. After the discharge of the metering bin 233 ends, the fiber feeding bin 11 stops discharging. After there is no spraying at the outlet of the foaming ball nozzle 323, the fan 311 is turned off. Then the oscillator 326 is turned off, the system stops working, and then each air door is closed. After there is no material on the dry fiber slab conveyor belt 15, the trolley 325 operates to move the spraying pipe 321 with multiple foaming ball nozzles 323 out of the paving bin 14. Then all systems stop.

[0068] The beneficial effects of the present invention are as follows:

[0069] 1. The light-weight flame-retardant fiber board produced by the system of the present invention has a balanced fiber layer density of the fiber board produced under the same production process conditions, the board is not easy to deform, and can meet the physical and mechanical property indexes such as the side nail-holding force of the board. The light-weight flame retardant meets the requirements of Class B and Class C flame-retardant boards specified in the national standard GB8624-2006 "Classification of the Burning Performance of Building Materials and Products". That is, the performance requirement indexes for use in the dry state in the light-weight fiber board industry standard of light-weight fiber boards with a density of 450 - 490 kg / m³, and also meets the requirements of the national Class C flame-retardant fire board for light-weight flame retardants.

[0070] 2. The flame-retardant foam ball spraying device of the present invention can control the foam balls to spray at various cross-sectional positions of the fiberboard cross-sectional layer, thereby reducing the density of the board. It can also realize continuous spraying of the foam balls in the front, back, and bottom angles, flat shooting, parabolic shooting, left and right moving sweeping, free fall, and downward semicircular manners. The positions of the foam particles in the cross-sectional area of ​​the board are not in a straight line, which enhances the side nail holding force of the board, and the board is not easy to deform; and the board will not have large-area irregular pits, which will not affect the subsequent decoration and appearance of the board.

[0071] Although the specific implementation modes of the present invention are described above, those skilled in the art should understand that the specific implementation modes described are only illustrative and are not intended to limit the scope of the present invention. Equivalent modifications and changes made by those skilled in the art in accordance with the spirit of the present invention should be included in the scope of protection of the claims of the present invention.

Claims

1. A lightweight flame-retardant fiberboard production system with a flame-retardant foam ball spraying device, characterized in that: It includes a fiber paving device, a foam ball shunting device and a spraying device. The fiber paving device includes a fiber feeding bin, a discharge conveyor belt, a dispersing roller, a paving bin, a slab conveyor belt and a leveling roller. The discharge conveyor belt is arranged at the bottom of the fiber feeding bin. The dispersing roller is arranged at the discharge port of the fiber feeding bin. The slab conveyor belt is arranged at the bottom of the paving bin and extends outside the outlet of the paving bin. The leveling roller is arranged at the outlet of the paving bin and above the slab conveyor belt. Short bundle teeth and long bundle teeth are distributed on the leveling roller, and the length of the long bundle teeth is longer than that of the short bundle teeth; The foam ball shunting device includes a foam ball bin, a screw feeder, a distribution bin and a foam ball feeding pipe. A screw feeder is arranged at the outlet of the foam ball bin, and the outlet of the screw feeder is arranged above the distribution bin. The foam ball feeding pipe is connected to the lower part of the distribution bin; In the distribution bin, a material dividing plate, a distribution plate, a plurality of metering bins and a flow limiting plate are arranged in sequence from top to bottom. First through holes are distributed on the distribution plate, and the inlets of the metering bins are communicated with the corresponding first through holes. Second through holes are distributed on the flow limiting plate, and the outlets of the metering bins are communicated with the corresponding second through holes. The lower ends of the second through holes are connected to the corresponding foam ball feeding pipes; The spraying device includes a pneumatic conveying component, a spraying component and a return air collection component. The pneumatic conveying component includes a fan, a wind box, a pneumatic conveying hose and a air volume regulating valve. The fan is connected to the air inlet of the wind box. A plurality of pneumatic conveying hoses are connected to the air outlet of the wind box, and an air volume regulating valve is arranged on each pneumatic conveying hose. The middle of each pneumatic conveying hose is connected to a foam ball feeding pipe; The spraying component is located in the paving bin and is erected above the slab conveyor belt and below the discharge port of the fiber feeding bin. The spraying component includes a spraying pipe, a plurality of foam ball accelerating pipes and a plurality of foam ball nozzles. Each foam ball accelerating pipe is arranged inside the spraying pipe, and the space formed between the inner wall and the outer wall of the spraying pipe is a return air collection chamber. One end of each foam ball accelerating pipe is respectively connected to the corresponding pneumatic conveying hose. Each foam ball nozzle penetrates through the spraying pipe, the inlet of each foam ball nozzle is connected to the corresponding foam ball accelerating pipe, and the outlet of each foam ball nozzle extends to the outside of the spraying pipe. A plurality of air holes are distributed on the pipe wall of each foam ball nozzle. Bearings are sleeved at both ends of the spraying pipe, and both bearings are fixed on the trolley. A swing device is also connected to the end of the spraying pipe; The setting positions of the long bundle teeth on the leveling roller correspond to those of the foam ball nozzles; The return air collection component includes a return air collection pipe, a main return air pipe, a return air valve, an air inlet pipe, and an air inlet valve. The return air collection pipe is communicated with the return air collection chamber, and the other end of the return air collection pipe is connected to the main return air pipe. The main return air pipe is connected to the middle of the air inlet pipe. The outlet end of the air inlet pipe is connected to a fan. The return air valve is arranged on the main return air pipe, and the air inlet valve is arranged at the inlet end of the air inlet pipe.

2. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: The length of the long bundle teeth is 40-60 mm longer than the length of the short bundle teeth.

3. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: A vibrator is further arranged outside the distribution bin.

4. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: A first handle is arranged at one end of the distribution plate, and a second handle is arranged at one end of the current-limiting plate; two installation grooves are arranged in the distribution bin, and one end of each installation groove penetrates the side wall of the distribution bin. The distribution plate and the current-limiting plate are detachably arranged in the installation grooves, and the first handle and the second handle extend outside the side wall of the distribution bin.

5. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: Each metering bin includes a cylindrical upper part and a conical lower part arranged up and down, and the inlet diameter of the metering bin is larger than the outlet diameter of the metering bin.

6. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: Chamfers are arranged on the upper and lower edges of the first through hole and the upper edge of the second through hole; the diameter of the first through hole is 3-5 mm, and the diameter of the second through hole is 3-4 mm.

7. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: The maximum angle at which the spraying pipe can rotate back and forth along the bearings at both ends is 15°.

8. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: The included angle between each foaming ball nozzle and the perpendicular bisector of the spraying pipe is from -110° to +110°.

9. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: The lengths of the foaming ball nozzles increase successively from bottom to top along the spraying pipe, so that the depths of the foaming balls sprayed from the foaming ball nozzles in the fiberboard are different and are arranged in a continuous V-shaped curve.

10. The lightweight flame-retardant fiberboard production system with a flame-retardant foaming ball spraying device according to claim 1, characterized in that: A fiber flow dividing cover is arranged above the spraying pipe.

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