A flame retardant foam ball spraying device for fiberboard

Abstract

The present invention provides a flame retardant foam ball spraying device for fiberboard, comprising a pneumatic conveying component, a spraying component and a return air collection component, wherein the middle of the pneumatic conveying hose of the pneumatic conveying component is connected with a flame retardant foam ball feeding pipe; the spraying component comprises a spraying pipe, a plurality of foam ball accelerating pipes and a plurality of foam ball nozzles, and the space formed between the inner wall and the outer wall of the spraying pipe is a return air collection chamber; each foam ball nozzle is arranged on the spraying pipe, one end of each foam ball accelerating pipe is connected with the pneumatic conveying hose, and the other end is connected with the foam ball nozzle, and the outlet of each foam ball nozzle extends to the outside of the spraying pipe; and a plurality of degassing holes are distributed on the pipe wall of each foam ball nozzle; bearings are sleeved at both ends of the spraying pipe. The present invention can control the foam ball to spray to each section position of the fiberboard section layer, reduce the density of the board, and at the same time, the position of the foam ball in the section of the board is not in a straight line, which enhances the side nail holding force of the board, and at the same time, the board is not easy to deform.

Description

[Technical field]

[0001] The invention relates to a flame retardant foaming ball spraying device for fiberboard. [Background technology]

[0002] Fiberboard is a kind of man-made board made of wood fiber or other plant fiber as the main raw material, through fiber preparation, adhesive application, fiber drying and laying out, and then hot pressing. According to the bulk density, fiberboard can be divided into high-density fiberboard, medium-density fiberboard, and low-density fiberboard. Due to the uniform material of fiberboard, it is widely used in the processing of furniture, flooring, wall panels, packaging boxes, ceilings, etc. After more than 40 years of development, the manufacturing technology of fiberboard has reached its limit, and it is impossible to significantly improve the physical and mechanical properties of fiberboard, especially in the development of lightweight fiberboard at low density, and it is impossible to produce high-performance flame-retardant boards with a density of less than 500kg / M3.

[0003] With the improvement of living standards, people's safety awareness has also increased. Medium and low density fiberboards must not only meet the original physical and mechanical indicators, but also have sufficient flame retardancy and lightness. In the existing flame retardant lightweight fiberboard production, the density is 450kg / m 3 -490kg / m 3 Lightweight flame retardant boards are difficult to prepare. The main reason is that within this density range, the physical and mechanical properties of the board are positively correlated with the board density. At the same time, the high density of the flame retardant increases the difficulty of reducing the density of the board. The existing solution is to evenly add flame retardants and flame retardant foaming agents to the dry fibers after sizing to reduce the average density of the fiberboard.

[0004] The drawback of this approach is that the sanded layer on the fiberboard surface contains foaming ball particles. After sanding off the pre-cured layer with the foaming ball particles on the surface, large irregular pits appear on the board, affecting the subsequent decoration and appearance of the board. In order to solve this problem, the existing method is to use a two-layer fiber paving method, laying the foaming balls in the middle, which solves the problem of the fiber sanding surface containing foaming ball particles, but there are two problems. First, because the middle layer is foaming balls, the board is hollow, and the physical and mechanical performance indicators such as the side nail holding force are insufficient; second, when the foaming ball particles overlap or the particle size is uneven, the density of the fiber layer of the fiberboard is seriously unbalanced, which easily causes the board to deform. There is no foaming ball particle spraying device and fiber paving combined application device available on the market, so that the foaming ball particles can be sprayed to each section position of the fiberboard section layer to reduce the density of the board. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide a flame retardant foam ball spraying device for fiberboard, which can control the foam balls to spray to various cross-sectional positions of the fiberboard cross-sectional layer, reduce the density of the board, and at the same time, the positions of the foam balls in the cross-sectional surface of the board are not in a straight line, which enhances the side nail holding force of the board and makes the board less likely to deform.

[0006] The present invention is achieved in that:

[0007] A flame retardant foam ball spraying device for fiberboard, comprising a pneumatic conveying component, a spraying component and a return air collecting component, wherein the pneumatic conveying component comprises a fan, a bellows, a pneumatic conveying hose and an air volume regulating valve, wherein the fan is connected to an air inlet of the bellows, and a plurality of pneumatic conveying pipes are connected to an air outlet of the bellows, and each of the pneumatic conveying pipes is provided with an air volume regulating valve; and a flame retardant foam ball feeding pipe is connected to the middle of each of the pneumatic conveying hoses;

[0008] The spray assembly includes a spray pipe, a plurality of foaming ball accelerating tubes and a plurality of foaming ball nozzles, each of which is arranged inside the spray pipe, and the space formed between the inner wall and the outer wall of the spray pipe is a return air collection chamber; one end of each of the foaming ball accelerating tubes is respectively connected to the corresponding pneumatic conveying hose, each of the foaming ball nozzles is penetrated on the spray pipe, the inlet of each of the foaming ball nozzles is connected to the corresponding foaming ball accelerating tube, and the outlet of each of the foaming ball nozzles extends to the outside of the spray pipe; and a plurality of degassing holes are distributed on the tube wall of each of the foaming ball nozzles; bearings are sleeved at both ends of the spray pipe, and both of the bearings are fixed on the trolley;

[0009] 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 connected to 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 part of the air inlet pipe, one end of the outlet of the air inlet pipe is connected to the 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.

[0010] Furthermore, the maximum angle at which the spray pipe can rotate forward and backward along the bearings at both ends is 15°.

[0011] Furthermore, the angle between each of the foaming ball nozzles and the perpendicular line of the spray pipe is -110° to +110°.

[0012] Furthermore, the length of each of the foaming ball nozzles increases sequentially from bottom to top along the spraying pipe.

[0013] The present invention has the following advantages:

[0014] 1. 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, reduce the density of the board, and can also realize the foam balls to spray at different angles in the front, back, and bottom at the same time, flat shooting, parabolic shooting, left and right moving sweeping, free fall, downward semicircular manner, etc. The positions of the foam ball particles in the cross-section 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.

[0015] 2. The light flame retardant fiberboard produced by the present invention has a balanced fiber layer density under the same production process conditions, is not easily deformed, 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.

Brief Description of the Drawings

[0016] The present invention will be further described below in conjunction with embodiments with reference to the accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the cooperation between a flame retardant foam ball spraying device and a diversion device for a fiberboard of the present invention.

[0018] Figure 2 This is a schematic diagram of the cooperation between a flame retardant foam ball spraying device and a fiber laying device for a fiberboard of the present invention.

[0019] Figure 3 It is a schematic diagram of the structure of the leveling roller of the present invention.

[0020] Figure 4 It is a side view of the spray assembly of the present invention.

[0021] Figure 5 It is a cross-sectional view of the foaming ball nozzle of the present invention.

[0022] Figure 6 It is a schematic structural diagram of a material dividing plate according to an embodiment of the present invention.

[0023] Figure 7 4 is a cross-sectional view of a distribution plate according to an embodiment of the present invention.

[0024] Figure 8 Schematic diagram of the top view of the distribution plate according to an embodiment of the present invention.

[0025] Fig. 9 Schematic diagram of the structure of the current limiting plate according to an embodiment of the present invention.

[0026] Fig.10 A side view of a dry fiber mat produced according to the present invention.

[0027] Fig.11 This is a diagram showing the effect of the foaming balls in the dry fiber board produced by the present invention filling the grooves after foaming and expansion. [Specific implementation method]

[0028] See also Figure 1-11 The present invention relates to a flame retardant foaming ball spraying device for fiberboard, wherein the spraying device 3 can cooperate with the fiber paving device 1 and the diverter device 2, and the fiber paving device comprises a fiber feeding bin 11, a discharging conveyor belt 12, a scattering roller 13, a paving bin 14, a slab conveyor belt 15 and a leveling roller 16, wherein the discharging conveyor belt 12 is arranged at the bottom of the fiber feeding bin 11, and a paving rake 17 is arranged above the discharging conveyor belt 12, and a plurality of scattering rollers 13 are arranged on the fiber feeding bin 11. The discharge port of the lower material bin 11 is designed, the slab conveyor belt 15 is arranged at the bottom of the paving bin 14 and extends to the outside of the paving bin 14 outlet, the leveling roller 16 is arranged at the paving bin 14 outlet and is located above the slab conveyor belt 15; short beam teeth 161 and long beam teeth 162 are distributed on the leveling roller 16, and the length of the long beam teeth 162 is longer than that of the short beam teeth 161; the length of the long beam teeth 162 is 40-60mm longer than that of the short beam teeth 161.

[0029] The flow dividing device 2 comprises a foam ball silo 21, a spiral discharging machine 22, a distribution bin 23 and a foam ball discharge pipe 24. The outlet of the foam ball silo 21 is provided with a spiral discharging machine 22, the discharge port of the spiral discharging machine 22 is arranged above the distribution bin 23, and the foam ball discharge pipe 24 is connected to a flow limiting plate 234 below the distribution bin 23;

[0030] The distribution bin 23 is provided with a material distribution plate 231, a distribution plate 232, a plurality of metering bins 233 and a flow limiting plate 234 from top to bottom. The distribution plate 232 is provided with first through holes 2321, and the inlet of each metering bin 233 is connected to the corresponding first through hole 2321; the flow limiting plate 234 is provided with second through holes 2341, and the outlet of each metering bin 233 is connected to the corresponding second through hole 2341; the lower end of each second through hole 2341 is connected to the corresponding foam ball discharge pipe 24;

[0031] The spraying device 3 includes a pneumatic conveying component 31, a spraying component 32 and a return air collecting component 33. The pneumatic conveying component 31 includes a fan 311, a bellows 312, a pneumatic conveying hose 313 and an air volume regulating valve 314. The fan 311 is connected to the air inlet of the bellows 312. The air outlet of the bellows 312 is connected to a plurality of pneumatic conveying pipes 313, and each of the pneumatic conveying pipes 313 is provided with an air volume regulating valve 314. The middle of each of the pneumatic conveying hoses 314 is connected to a foam ball feeding pipe 24.

[0032] The spray assembly 32 is located in the paving bin 14 and is mounted above the slab conveyor belt 15 and below the discharge port of the fiber unloading bin 11. The spray assembly 32 includes a spray pipe 321, a plurality of foaming ball accelerating tubes 322 and a plurality of foaming ball nozzles 323. Each of the foaming ball accelerating tubes 322 is arranged inside the spray pipe 321. The space formed between the inner wall and the outer wall of the spray pipe 321 is a return air collection chamber 3211. One end of each of the foaming ball accelerating tubes 322 is respectively connected to the corresponding pneumatic conveying hose 313. Each of the foaming ball nozzles 323 is penetrated on the spray pipe 321. The inlet of the foaming ball nozzle 323 is connected to the corresponding foaming ball accelerating tube 322, and the outlet of each foaming ball nozzle 323 extends to the outside of the spraying tube 321; the inner wall and outer wall of the through hole of the spraying tube 321 through which the foaming ball nozzle 323 is penetrated are provided with threads (not shown in the figure), and each foaming ball nozzle 323 is provided with two groups of screw teeth 3231 corresponding to the threads, and the spraying tube 321 is connected to each foaming ball nozzle 323 through the threads and screw teeth 3231; the inlet of each foaming ball nozzle 323 is connected to the corresponding foaming ball accelerating tube 322 through a universal ball joint 3232 respectively.

[0033] A plurality of degassing holes 3233 are distributed on the tube wall of each foaming ball nozzle 323; the diameter of the degassing holes 3 is smaller than the smallest diameter of the foaming ball, usually 1mm-1.5mm; bearings 324 are sleeved at both ends of the spraying pipe 321, and the two bearings 324 are fixed on the trolley 325; an oscillator 326 is also connected to the end of the spraying pipe 321; the oscillator 326 cooperates with the bearings 324 to control the spraying pipe 321 to rotate back and forth along the bearings 324 at both ends.

[0034] The long beam teeth 162 on the leveling roller 16 are arranged at positions corresponding to the foaming ball nozzles 323;

[0035] The return air collecting assembly 33 includes a return air collecting 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 collecting pipe 331 is connected to the return air collecting chamber 3211, and the other end of the return air collecting pipe 331 is connected to the return air main pipe 332, the return air main pipe 332 is connected to the middle part of the air inlet pipe 334, and one end of the outlet 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.

[0036] A vibrator (not shown) is also provided outside the distribution bin 23. The vibration of the vibrator can drive the foaming balls in the distribution bin 23 to vibrate, thereby preventing the foaming balls in the distribution bin from framing and uneven distribution.

[0037] The material distribution plate 231 includes a distribution plate 2311 and an adjusting rod 2312 which is parallelly arranged on the distribution plate 2311. Both ends of the adjusting rod 2312 are rotatably arranged on the side walls of the distribution bin 23. The distribution plate 2311 is rotated by rotating the adjusting rod 2312 to control the cloth conditions on the front and rear sides to prevent uneven cloth.

[0038] A first handle 2322 is provided at one end of the distribution plate 232, and a second handle 2342 is provided at one end of the flow limiting plate 234; two mounting grooves (not shown) are provided in the distribution bin 23, one end of each mounting groove penetrates the side wall of the distribution bin 23, the distribution plate 232 and the flow limiting plate 234 are detachably arranged in the mounting grooves, and the first handle 2322 and the second handle 2342 extend to the outside of the side wall of the distribution bin 23; the first handle 2322 and the second handle 2342 are used for installation and replacement of the distribution plate 232 and the flow limiting plate 234, that is, the distribution plate 232 and the flow limiting plate 234 with through holes of different diameters can be replaced according to actual conditions;

[0039] Each of the metering bins 233 includes a cylindrical upper portion and a conical lower portion arranged vertically, and the inlet diameter of the metering bin 233 is larger than the outlet diameter of the metering bin. Each of the metering bins 233 is used to receive and store foam balls.

[0040] The upper and lower edges of the first through hole 2321 and the upper edge of the second through hole 2341 are both chamfered to facilitate the smooth entry of the foam ball; 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.

[0041] The maximum angle that the spray pipe 321 can rotate forward and backward along the bearings 324 at both ends is 15° (that is, the maximum angle that can be rotated forward and backward is 15°). The angle between each of the foaming ball nozzles 323 and the midpoint perpendicular line L of the spray pipe 321 is -110° to +110° (that is, the lowest point of the midpoint perpendicular line L is 0°, counterclockwise is a positive angle, and clockwise is a negative angle). The length of each of the foaming ball nozzles 323 increases from bottom to top along the spray pipe 321. That is, according to the position of each foaming ball designed in the dry fiber board blank according to actual production needs, the angle that the spray pipe 321 can rotate forward and backward along the bearings 324 at both ends, the angle between each of the foaming ball nozzles 323 and the midpoint perpendicular line of the spray pipe 321, and the length of each of the foaming ball nozzles 323 are adjusted.

[0042] A fiber diversion cover 327 is disposed above the spraying pipe 321 to divert the dry fibers falling from above the spraying pipe 321 to two sides of the spraying pipe 321 .

[0043] The multiple in the present invention is more than three, and the number of the first through hole 2321, the metering bin 233, the second through hole 2341, the feeding pipe 24, the pneumatic conveying hose 314, the foaming ball accelerating tube 322, the foaming ball nozzle 323 and the long beam teeth 162 corresponds.

[0044] The working process of the present invention is as follows:

[0045] 1. Start-up preparation

[0046] The dry fiber slab conveyor belt 15 is running, the paving rake 17, the discharging conveyor belt 12, and the fiber scattering rollers 13 (multiple) are waiting to be started, and the dry fiber inlet of the fiber unloading bin 11 begins to drop material (i.e., fiber, and the fiber used in production is dry fiber containing flame retardant).

[0047] The trolley 325 below the spraying pipe 321 is running, and the spraying pipe 321 including a plurality of foaming ball nozzles is placed below the discharge port of the paving bin 14, ready to spray the foaming ball particles.

[0048] The foam ball particle raw material (the foam ball particles are post-foamed flame-retardant polystyrene particles) is poured into the foam ball silo 21, the air volume regulating valve 314 of each pneumatic conveying hose 313 is 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 material distribution plate 231 is adjusted, and the distribution plate 232 and the flow limiting plate 234 with suitable through-hole diameters are selected. The vibrator (not shown) is turned on, and the bottom edge of the discharge port of the spiral discharging machine 22 is slidably sealed and connected with the feed port of the distribution bin 23. The trolley 325 moves slowly left and right, and the oscillator 326 works, so that the spray pipe 321 rotates slowly in the bearing 324 in a forward and backward circle, and the maximum angle is 15° forward and backward. The leveling roller 16 equipment is turned on and operated.

[0049] 2. Power on:

[0050] The paving rake 17, the discharge conveyor belt 12, and the fiber scattering roller 13 are started and operated, and the dry fiber inlet of the fiber discharge bin 11 starts to continue to discharge materials, and the discharge port of the fiber discharge bin 11 continuously discharges materials. The spiral discharger 22 is running, and the foam ball raw material falls from the discharge port of the spiral discharger 22, enters the distribution bin 23 of the flame retardant foam ball, is adjusted and distributed by the distribution plate 231, and then falls to the distribution plate 232, and is evenly distributed to the multiple metering bins 233 below after screening by the distribution plate 232. Then, the foam ball falls into the discharge pipe 24 due to the flow restriction of the flow restriction plate 234 below. Under the mixing of the suction wind from the return air collection component 33 and the pressure air wind blown by the bellows 312, the foam ball is accelerated in the pneumatic conveying hose 313 and the foam ball accelerating air duct 322, and finally blown out from the outlet of the foam ball nozzle 323.

[0051] The fiber splitter hood 327 above the spray pipe 321 divides the continuous dry fiber falling from the outlet of the fiber feed bin 11 into two parts of fibers. The fibers at the right outlet are the conventionally laid lower surface paving fibers; the fibers at the left outlet are the conventionally laid upper surface paving fibers. The flame retardant foaming balls are sprayed into the dry fiber slab in a large area at the angle where the foaming ball nozzle 323 is located, and the final position is as follows Fig.10 As shown (the depth of the foaming balls 100 in the dry fiber board 200 is different and they are arranged in a continuous V-shape). The distance h2 between the foaming balls 100 at the bottom of the dry fiber board 200 and the bottom is greater than or equal to 20 mm. The distance h1 between the foaming balls 100 at the top of the dry fiber board 200 and the highest point is greater than or equal to 70 mm from the upper edge of the top of the dry fiber board 200.

[0052] The foaming ball 100 is a post-foamed flame-retardant polystyrene particle ball, which is foamed under high temperature and high pressure in a hot press. The leveling roller 16 is used to rake off the excess dry fibers of the slab on the slab conveyor belt 15, and the long bundle teeth 162 correspond to the flame-retardant foaming ball 100 laying device, which is used to rake off the excess wood fibers above the foaming ball 100 to form a groove 201, such as Fig.10 As shown, the depth h3 of the groove 201 is 40-60 mm, so that the fiber laying amount of the flame retardant foaming ball particles in the vertical direction is less than that on both sides, and the pressure is smaller. When foaming in the press, the vertical direction is mainly guided to foam. When the flame retardant foaming ball particles are foamed and expanded, the groove 201 can be filled, such as Fig.11 shown.

[0053] The leveling roller 16 is arranged to move left and right (not shown), and the distance of the left and right movement is equal to the distance of the left and right movement of the foaming ball nozzle 323, and the time lag is a fixed time t=the distance from the spray pipe to the leveling roller / the speed of the slab conveyor belt.

[0054] As the trolley 325 moves slowly left and right, the oscillator 326 works, so that the spray pipe 321 containing multiple foaming ball nozzles 323 slowly swings forward and backward at an angle of 0-15° in the bearing 324, and the wind force is adjusted at the same time, so that the flame retardant foaming balls 100 can be continuously sprayed from each foaming ball nozzle 323, and continuously sprayed from each foaming ball nozzle 323 at different angles, different wind pressures, and different positions into the dry fiber board 200. The return air collection chamber 3211 collects the excess gas sprayed from the degassing holes 3233 of each foaming ball nozzle 323, and enters the fan 311 through the return air collection pipe 331, the return air main pipe 332, and the return air valve 333.

[0055] The paving slabs coated with post-foamed particles are transported to subsequent pre-pressing, hot pressing, and rough board processing production processes for processing.

[0056] Shutdown: The screw discharging machine 22 stops and stops discharging. After the metering bin 233 finishes discharging, the fiber discharging bin 11 stops discharging. When there is no spray 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 the air doors are closed. When there is no material on the dry fiber sheet conveyor belt 15, the trolley 325 moves to move the spraying pipe 321 containing multiple foaming ball nozzles 323 out of the paving bin 14. Then all systems are shut down.

[0057] The beneficial effects of the present invention are as follows:

[0058] 1. 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, reduce the density of the board, and can also realize the foam balls to spray at different angles in the front, back, and bottom at the same time, flat shooting, parabolic shooting, left and right moving sweeping, free fall, downward semicircular manner, etc. The positions of the foam particles in the cross-section 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.

[0059] 2. The light flame retardant fiberboard produced by the present invention has a balanced fiber layer density under the same production process conditions, is not easily deformed, 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.

[0060] 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 flame retardant foam ball spraying device for fiberboard, characterized in that: It includes a pneumatic conveying component, a spraying component and a return air collection component. The pneumatic conveying component includes a fan, a bellows, a pneumatic conveying hose and an air volume regulating valve. The fan is connected to the air inlet of the bellows. The air outlet of the bellows is connected to multiple pneumatic conveying hoses, and each of the pneumatic conveying hoses is provided with an air volume regulating valve; the middle of each of the pneumatic conveying hoses is connected to a flame retardant foaming ball feeding pipe; The spray assembly includes a spray pipe, a plurality of foaming ball accelerating tubes and a plurality of foaming ball nozzles, each of which is arranged inside the spray pipe, and the space formed between the inner wall and the outer wall of the spray pipe is a return air collection chamber; one end of each of the foaming ball accelerating tubes is respectively connected to the corresponding pneumatic conveying hose, each of the foaming ball nozzles is penetrated on the spray pipe, the inlet of each of the foaming ball nozzles is connected to the corresponding foaming ball accelerating tube, and the outlet of each of the foaming ball nozzles extends to the outside of the spray pipe; and a plurality of degassing holes are distributed on the tube wall of each of the foaming ball nozzles; bearings are sleeved at both ends of the spray pipe, and both of the bearings are fixed on the trolley; 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 connected to 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 part of the air inlet pipe, one end of the outlet of the air inlet pipe is connected to the 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.

2. The flame retardant foam ball spraying device for fiberboard according to claim 1, characterized in that: The maximum angle at which the spray pipe can rotate forward and backward along the bearings at both ends is 15°.

3. The flame retardant foam ball spraying device for fiberboard according to claim 1, characterized in that: The included angle between each of the foaming ball nozzles and the perpendicular line of the spray pipe is -110° to +110°.

4. The flame retardant foam ball spraying device for fiberboard according to claim 1, characterized in that: The length of each of the foaming ball nozzles increases sequentially from bottom to top along the spraying pipe.

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