Flame retardant sheet material and processing equipment and method thereof

Abstract

The present invention discloses a flame retardant sheet material and its processing equipment and processing method, which relate to the technical field of flame retardant material processing, including a conveying device, a crushing device, a mixing device, a granulating device, a molding device and a curing device. The conveying device is used to convey polypropylene plastic to the crushing device; the crushing device is used to crush the polypropylene plastic; the mixing device is used to evenly mix the polypropylene plastic with an inorganic flame retardant and an organic flame retardant; the granulating device is used to granulate the mixed raw materials; the molding device is used to process the granulated raw materials into flame retardant sheets of a desired shape; and the curing device is used to cure the flame retardant sheets after curing. The present invention effectively prevents the problem of plastic powder adhering to the outer surface of the crushing roller due to heat during the plastic crushing process by reducing the adhesion of plastic powder to the surface of the crushing roller.

Description

Technical Field

[0001] The invention relates to the technical field of flame retardant material processing, in particular to a flame retardant sheet material and processing equipment and a processing method thereof. Background Art

[0002] PP sheet is a new type of green and environmentally friendly packaging material. It not only has high transparency, good barrier properties, low density, non-toxicity and hygiene, but also can be recycled. It does not produce toxic and harmful gases when heated or burned, does not harm human health, and does not corrode equipment.

[0003] PP sheets can be made into various products through secondary processing such as thermoforming, mainly used for packaging of food, medicine, medical devices, etc. For example, jelly boxes, dairy packaging boxes, fast food boxes, cold drink containers, trays, microwave ovens, etc. can be used for food packaging; blisters can be used for packaging of solid preparations such as pharmaceutical tablets and capsules.

[0004] During the processing of PP sheets, the plastic raw materials need to be crushed and pre-processed. Plastic crushing, also known as plastic pulverizer, is mainly used to crush various plastic plastics and rubbers such as plastic profiles, tubes, rods, wires, films, and waste rubber products. The pellets can be directly used for extruders or injection molding, or they can be recycled through basic granulation. Plastic crushers are also peripheral equipment for injection molding machines, which can crush and recycle defective products and sprue materials produced by injection molding machines.

[0005] Plastic powder will be produced in the process of plastic crushing and recycling. However, due to the thermosetting nature of plastic powder, it is susceptible to the heat generated by friction and shear during the crushing process, causing adhesion. Specifically, when the plastic powder passes through the crushing action of the crushing roller, a large amount of heat will be generated due to the rotation of the crushing roller and the mutual friction between the plastic particles. This heat causes the surface temperature of the plastic powder to rise rapidly. When it reaches or exceeds the glass transition temperature of the plastic, the plastic powder will soften or even melt, and then adhere to the outer surface of the crushing roller. This adhesion phenomenon will not only reduce the working efficiency of the crushing roller, but also affect the particle size distribution and product quality of the plastic powder after crushing.

[0006] In order to prevent plastic powder from adhering to the surface of the crushing roller, the existing solution is usually to set brush rollers that fit the crushing rollers on both sides of the crushing roller. The brush rollers rotate while in contact with the outer surface of the crushing roller to clean the surface of the crushing roller. During the long-term contact and rotation of the brush roller with the crushing roller, the brushes will gradually wear out, resulting in a decrease in the cleaning effect. Therefore, the brush rollers need to be replaced regularly, which increases the maintenance cost of the equipment and the frequency of maintenance work. There is also an electric vacuum method to absorb and remove dust. Although it can effectively collect dust on the surface of the crushing roller, it consumes a lot of electricity during operation, which increases the cost of use.

[0007] In view of this, this application is hereby filed. Summary of the invention

[0008] The object of the present invention is to provide a flame retardant sheet material and a processing device and method thereof to solve the problems raised in the above background technology.

[0009] To solve the above technical problems, the present invention provides a flame retardant sheet material, which is mixed with polypropylene plastic, inorganic flame retardant and organic flame retardant, wherein the inorganic flame retardant includes aluminum hydroxide and phosphate, and the organic flame retardant includes halogen and phosphate.

[0010] The present invention also provides a flame retardant sheet processing equipment, including a conveying device, a crushing device, a mixing device, a granulating device, a molding device and a curing device, wherein the conveying device is used to convey the polypropylene plastic to the crushing device; the crushing device is used to crush the polypropylene plastic; the mixing device is used to evenly mix the polypropylene plastic with the inorganic flame retardant and the organic flame retardant; the granulating device is used to granulate the mixed raw materials; the molding device is used to process the granulated raw materials into flame retardant sheets of a desired shape; and the curing device is used to cure the flame retardant sheets after molding.

[0011] Furthermore, the crushing device includes a crushing assembly, a discharging assembly and a cleaning assembly, wherein the crushing assembly includes a crushing box, a crushing roller symmetrically mounted inside the crushing box for crushing plastic, and a driving structure for driving the crushing roller to rotate;

[0012] The cleaning assembly comprises a through shaft inserted into the crushing roller, both ends of the through shaft are fixedly connected to a fixing seat, the fixing seat is fixedly mounted on the outer wall of the crushing box, a plurality of contraction pieces are equidistantly mounted on the outer wall of the through shaft, and a metal folding plate is also arranged on the inner wall of the crushing roller, and when the crushing roller rotates, the metal folding plate rotates synchronously and squeezes the contraction piece;

[0013] The shrinking part includes a mounting plate fixedly mounted on the outer wall of the through-shaft, a plurality of sliding cavities are opened inside the mounting plate, a collision rod is slidably mounted inside the sliding cavity, one end of the collision rod is abutted against the inner wall of the crushing roller, the other end of the collision rod is fixedly connected to an axial spring, and the end of the axial spring away from the collision rod is fixedly connected to the inner wall of the sliding cavity.

[0014] Furthermore, the crushing roller includes a roller body with a hollow structure inside and a crushing disk installed on the outer surface of the roller body. Hollow roller shafts are fixedly connected at the centers of both end surfaces of the roller body. The hollow roller shafts are rotatably installed on the side walls of the crushing box. The through shaft is inserted into the interior of the hollow roller shaft and the roller body. The metal folding plate is made of flexible metal. The metal folding plate includes a mounting portion fixedly connected to the inner wall of the roller body. The mounting portion is integrally formed with an arc portion. The end of the arc portion away from the mounting portion is integrally formed with a turning portion. The lower part of the turning portion is connected to a connecting portion, and the connecting portion is slidably connected to the inner wall of the roller body.

[0015] Furthermore, an adjustment mechanism for adjusting the position of the connecting part is provided on the inner wall of the crushing roller, and the adjustment mechanism includes an adjustment groove provided on the inner wall of the roller body, a sliding block is slidably connected inside the adjustment groove, and one end of the connecting part away from the turning part is fixedly connected to the sliding block. A sealing cavity connected to the adjustment groove is provided on the side wall of the roller body, and a piston rod is slidably installed inside the sealing cavity, one end of the piston rod extends to the inside of the adjusting groove and is connected to the side wall of the sliding block, and the other end of the piston rod is fixedly connected to a piston plate, and the piston plate slides sealingly inside the sealing cavity. An oil storage cavity connected to the sealing cavity is also provided on the roller body, and the inside of the oil storage cavity is filled with liquid kerosene.

[0016] Furthermore, the driving structure includes a base, a driving motor fixed on the base, and two transmission gears fixedly mounted on the outer wall of the hollow roller shaft and meshing with each other. A driving wheel is fixedly connected to the outer wall of the driving end of the driving motor, a driven wheel is fixedly mounted on the outer wall of one of the hollow roller shafts, and a synchronous belt is connected between the driving wheel and the driven wheel.

[0017] Furthermore, the discharging assembly includes a discharging barrel fixedly mounted on the bottom end of the crushing box, a discharging port and a collecting port are arranged on the outer wall of the discharging barrel, the collecting port is communicated with the crushing box, a rotating shaft is rotatably mounted inside the discharging barrel, a spiral auger is fixedly mounted on the outer wall of the rotating shaft, one end of the rotating shaft passes through the side wall of the discharging barrel and is connected to a coupling, and the discharging barrel is connected to the driving end of the driving motor through the coupling.

[0018] Furthermore, the conveying device includes a conveying mechanism, a material receiving bin and a feeding bin, the conveying mechanism includes a conveying platform, a conveying roller rotatably installed inside the conveying mechanism, a conveying belt transmission-connected to the conveying roller, a conveying motor fixedly installed on the outer wall of the conveying platform for driving the conveying roller to rotate, and a support frame connected to the bottom surface of the conveying platform for supporting the conveying platform, a material discharge port is provided on the side wall of the upper port of the conveying platform, the material receiving bin is fixedly connected to the bottom surface of the material discharge port, the feeding bin is welded to a side of the material receiving bin away from the conveying mechanism, and the feeding bin cover is provided on the top of the crushing assembly.

[0019] The present invention also provides a method for processing a flame retardant sheet, comprising the following steps:

[0020] S1. Pretreatment: The polypropylene plastic is transported by the conveying mechanism. The polypropylene plastic transported by the conveying mechanism enters the crushing component for crushing. The crushed plastic raw materials are discharged through the discharging component, and then the plastic raw materials are screened, impurity-removed and dried to ensure the purity and quality of the plastic raw materials.

[0021] S2. Mixing: The pretreated plastic raw materials, inorganic flame retardants and organic flame retardants are sent to the mixing device for mixing in a certain proportion, and the mixing temperature and time are controlled to ensure that the raw materials are mixed evenly.

[0022] S3, granulation: the mixed raw materials are sent to a granulation device for granulation treatment to obtain a granular flame retardant material.

[0023] S4, molding: the granulated flame retardant material is sent to the molding device for processing, and the flame retardant sheet of the desired shape is obtained by controlling parameters such as molding temperature, pressure and speed.

[0024] S5. Curing: The formed flame retardant sheet is cured. By controlling the curing temperature and time, the flame retardant sheet can obtain good mechanical properties and flame retardant properties.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. In the present invention, when metal friction and metal collision occur between the cleaning component and the crushing roller, these metal friction and metal collision will generate sound waves inside the crushing roller. These sound waves propagate on the surface of the crushing roller and in the surrounding air, causing vibration of air molecules. When these vibrating air molecules come into contact with the plastic powder attached to the surface of the crushing roller, they will generate enough energy to break the adhesion between the plastic powders, thereby achieving the effect of removing the plastic powder on the surface of the crushing roller.

[0027] 2. The present invention can adjust the height of the turning part of the metal folding plate according to the surface temperature of the crushing roller through the adjustment mechanism. When the surface temperature of the crushing roller is high, it means that the plastic powder is more likely to absorb the heat of the crushing roller surface, which will accelerate the softening or even melting of the plastic powder. The present invention adjusts the height of the turning part so that the collision rod can slide a greater distance into the sliding cavity. As a result, the axial spring is subjected to a continuously increasing external force compression, and the deformation degree of the axial spring is aggravated, forming a tighter compression shape. When the axial spring is subjected to a stronger compression, the elastic potential energy stored in it is significantly increased, so that it exhibits a stronger rebound force when released, thereby increasing the metal impact force between the collision rod and the inner wall of the crushing roller, and enhancing the generation of sound waves by increasing the impact force. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the connection structure between the conveying device and the crushing device in the processing equipment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the crushing assembly in the present invention;

[0030] Figure 3 It is a schematic diagram of the cross-sectional structure of the crushing assembly in the present invention;

[0031] Figure 4 It is a schematic diagram of the structure of the crushing roller in the present invention;

[0032] Figure 5 It is a schematic diagram of the side section structure of the crushing roller in the present invention;

[0033] Figure 6 It is a schematic diagram of the top-sectional structure of the crushing roller in the present invention;

[0034] Figure 7 It is a schematic diagram of the structure of the metal folding plate in the present invention.

[0035] In the figure:

[0036] 1. Conveying mechanism; 11. Conveying platform; 12. Conveying roller; 13. Conveying belt; 14. Conveying motor; 15. Support frame;

[0037] 2. Material receiving silo;

[0038] 3. Feeding silo;

[0039] 4. Crushing assembly; 41. Crushing box; 411. Support legs; 412. Crushing chamber; 413. Discharging chamber; 42. Crushing roller; 421. Hollow roller shaft; 422. Roller body; 423. Crushing disc; 43. Driving motor; 44. Driving wheel; 45. Driven wheel; 46. Synchronous belt; 47. Base; 48. Transmission gear;

[0040] 5. Discharge assembly; 51. Discharge barrel; 52. Discharge port; 53. Collecting port; 54. Rotating shaft; 55. Coupling; 56. Screw auger;

[0041] 6. Cleaning assembly; 61. Through-shaft; 62. Fixed seat; 63. Retracting piece; 631. Mounting plate; 632. Sliding cavity; 633. Collision rod; 634. Axial spring; 64. Metal folding plate; 641. Mounting portion; 642. Arc portion; 643. Turning portion; 644. Connecting portion; 65. Adjusting mechanism; 651. Adjusting groove; 652. Sliding block; 653. Sealing cavity; 654. Piston rod; 655. Piston plate; 656. Liquid kerosene. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The invention provides a flame retardant sheet material, which is formed by mixing polypropylene plastic, inorganic flame retardant and organic flame retardant, wherein the inorganic flame retardant comprises aluminum hydroxide and phosphate, and the organic flame retardant comprises halogen and phosphate ester.

[0044] The invention provides a flame retardant sheet processing equipment, comprising a conveying device, a crushing device, a mixing device, a granulating device, a molding device and a curing device, wherein the conveying device is used for conveying polypropylene plastic to the crushing device; the crushing device is used for crushing the polypropylene plastic; the mixing device is used for uniformly mixing the polypropylene plastic with an inorganic flame retardant and an organic flame retardant; the granulating device is used for granulating the mixed raw materials; the molding device is used for processing the granulated raw materials into flame retardant sheets of a desired shape; and the curing device is used for curing the formed flame retardant sheets.

[0045] See also Figure 1-Figure 4 The crushing device includes a crushing assembly 4, a discharging assembly 5 and a cleaning assembly 6. The crushing assembly 4 includes a crushing box 41, a crushing roller 42 symmetrically mounted inside the crushing box 41 for crushing plastic, and a driving structure for driving the crushing roller 42 to rotate;

[0046] Specifically, during operation, the driving structure can drive the two crushing rollers 42 symmetrically arranged inside the crushing box 41 to rotate relative to each other. The rotation of the crushing rollers 42 can crush the plastic entering the crushing box 41. The plastic powder generated during the crushing process will adhere to the surface of the crushing rollers 42. The cleaning component 6 can reduce the adhesion between the plastic powder and the outer surface of the crushing rollers 42, thereby achieving the effect of cleaning the plastic powder on the surface of the crushing rollers 42.

[0047] The above is the specific operation of plastic crushing, and the specific working principle of the cleaning component 6 is disclosed below;

[0048] First, based on the above structure, refer to Figure 5 and Figure 6 The specific structure of the cleaning component 6 is disclosed, the cleaning component 6 includes a through shaft 61 inserted into the crushing roller 42, both ends of the through shaft 61 are fixedly connected with a fixing seat 62, the fixing seat 62 is fixedly installed on the outer wall of the crushing box 41, a plurality of contraction members 63 are equidistantly installed on the outer wall of the through shaft 61, a metal folding plate 64 is also provided on the inner wall of the crushing roller 42, when the crushing roller 42 rotates, the metal folding plate 64 rotates synchronously and squeezes the contraction member 63; the contraction member 63 includes a mounting plate 631 fixedly installed on the outer wall of the through shaft 61, a plurality of sliding cavities 632 are provided inside the mounting plate 631, a collision rod 633 is slidably installed inside the sliding cavity 632, one end of the collision rod 633 is against the inner wall of the crushing roller 42, the other end of the collision rod 633 is fixedly connected with an axial spring 634, and the end of the axial spring 634 away from the collision rod 633 is fixedly connected to the inner wall of the sliding cavity 632.

[0049] Specifically, during operation, the crushing roller 42 crushes the plastic, and its rotation direction is as follows: Figure 6 As shown in the figure, the rotation of the crushing roller 42 will drive the metal folding plate 64 inside it to rotate synchronously. When the axial spring 634 is fully ejected, the collision rod 633 is against the inner wall of the crushing roller 42. Since the collision rod 633 is made of metal, when the crushing roller 42 is in a rotating state, the collision rod 633 will generate metal friction with the inner wall of the crushing roller 42; and as the crushing roller 42 rotates, multiple collision rods 633 will slide alternately along the inner side of the metal folding plate 64 attached to the metal folding plate 64. Since the metal folding plate 64 has a certain curvature, the collision rod 633 will slide into the inside of the sliding cavity 632 during the sliding process. At this time, the axial spring 634 is compressed. When the collision rod 633 moves over the metal folding plate 64, the axial spring 634 elastically resets and pushes the collision rod 633 to collide with the inner wall of the crushing roller 42. This causes metal friction and metal collision to occur inside the crushing roller 42 when it rotates.

[0050] When metal friction and metal collision occur between the cleaning component 6 and the crushing roller 42, these metal friction and metal collision will generate sound waves inside the crushing roller 42. These sound waves propagate on the surface of the crushing roller 42 and in the surrounding air, causing vibration of air molecules. When these vibrating air molecules come into contact with the plastic powder attached to the surface of the crushing roller 42, they will generate enough energy to break the adhesion between the plastic powders, thereby achieving the effect of removing the plastic powder from the surface of the crushing roller 42.

[0051] Based on the above structure, Figure 1 and Figure 2 It is shown that the specific structure of the crushing box 41 is disclosed. The crushing box 41 includes a plurality of supporting legs 411 supported on the ground. The top ends of the plurality of supporting legs 411 are commonly connected to a discharge chamber 413 with a rectangular frame structure. The bottom of the discharge chamber 413 is fixedly connected to a crushing chamber 412 with a funnel structure. When the plastic is crushed, it will first enter the discharge chamber 413 for crushing, and can be discharged through the crushing chamber 412 after the crushing is completed.

[0052] In order to facilitate the cleaning assembly 6 to be arranged inside the crushing roller 42, see Figure 4 The crushing roller 42 includes a roller body 422 with a hollow structure inside and a crushing disk 423 installed on the outer surface of the roller body 422. The centers of both end surfaces of the roller body 422 are fixedly connected with a hollow roller shaft 421. The hollow roller shaft 421 is rotatably installed on the side wall of the crushing box 41. The through shaft 61 is inserted into the hollow roller shaft 421 and the roller body 422.

[0053] In order to improve the stability of the metal folding plate 64 installed inside the crushing roller 42, see Figure 6 and Figure 7 The metal folding plate 64 is made of flexible metal. The metal folding plate 64 includes a mounting portion 641 fixedly connected to the inner wall of the roller body 422. An arc portion 642 is integrally formed on the mounting portion 641. A turning portion 643 is integrally formed at one end of the arc portion 642 away from the mounting portion 641. A connecting portion 644 is connected to the lower part of the turning portion 643. The connecting portion 644 is slidably connected to the inner wall of the roller body 422.

[0054] The installation portion 641 is provided to increase the fit between the metal folding plate 64 and the inner wall of the crushing roller 42, and the installation portion 641 is welded and fixed to the inner wall of the crushing roller 42 to improve the stability of the installation of the metal folding plate 64. The arc surface portion 642 provided on the installation portion 641 can ensure that the internal contraction of the box sliding cavity 632 occurs when the collision rod 633 slides along the metal folding plate 64. The turning portion 643 and the connecting portion 644 are provided to increase the overall support strength of the arc surface portion 642, so that the arc surface portion 642 will not produce flexible deformation when the collision rod 633 slides along the arc surface portion 642.

[0055] See also Figure 6 , an adjusting mechanism 65 for adjusting the position of the connecting portion 644 is provided on the inner wall of the crushing roller 42;

[0056] Specifically, during operation, the height of the turning portion 643 in the metal folding plate 64 can be adjusted according to the surface temperature of the crushing roller 42 through the adjusting mechanism 65. When the surface temperature of the crushing roller 42 is high, it means that the plastic powder is more likely to absorb the heat of the surface of the crushing roller 42, which will accelerate the softening or even melting speed of the plastic powder. The present invention adjusts the height of the turning portion 643 so that the collision rod 633 can slide a greater distance into the sliding cavity 632, which makes the axial spring 634 more deformed under the compression of the continuously increasing external force, forming a tighter compression shape. When the axial spring 634 is subjected to a stronger compression, the elastic potential energy stored in it is significantly increased, so that it shows a stronger rebound force when released, thereby increasing the metal collision force between the collision rod 633 and the inner wall of the crushing roller 42, and enhancing the generation of sound waves by increasing the collision force.

[0057] The above is the specific function of the metal folding plate 64, and the specific working principle of the adjustment mechanism 65 is disclosed below;

[0058] First, based on the above structure, refer to Figure 6 The specific structure of the adjustment mechanism 65 is disclosed. The adjustment mechanism 65 includes an adjustment groove 651 provided on the inner wall of the roller body 422. The interior of the adjustment groove 651 is slidably connected with a sliding block 652. One end of the connecting portion 644 away from the turning portion 643 is fixedly connected with the sliding block 652. A sealing cavity 653 connected with the adjustment groove 651 is provided on the side wall of the roller body 422. A piston rod 654 is slidably installed inside the sealing cavity 653. One end of the piston rod 654 extends to the interior of the adjustment groove 651 and is connected to the side wall of the sliding block 652. The other end of the piston rod 654 is fixedly connected with a piston plate 655. The piston plate 655 is sealingly slid inside the sealing cavity 653. An oil storage cavity connected with the sealing cavity 653 is also provided on the roller body 422. The interior of the oil storage cavity is filled with liquid kerosene 656.

[0059] Specifically, during operation, the liquid kerosene 656 can absorb the temperature of the surface of the crushing roller 42. When the temperature of the liquid kerosene 656 is greater than 45°C, the piston plate 655 slides along the inside of the sealing chamber 653 as the liquid kerosene 656 expands. The sliding of the piston plate 655 can push the piston rod 654 to slide. The piston rod 654 can push the sliding block 652 to slide inside the adjusting groove 651. The adjusting groove 651 drives the connecting part 644 to move synchronously, and the height of the turning part 643 can be adjusted. When the surface temperature of the crushing roller 42 decreases, the temperature of the liquid kerosene 656 decreases accordingly. At this time, the metal flexibility of the metal folding plate 64 will reset it.

[0060] See also Figure 2-Figure 4 The driving structure includes a base 47, a driving motor 43 fixed on the base 47, and two transmission gears 48 fixedly mounted on the outer wall of the hollow roller 421 and meshing with each other. A driving wheel 44 is fixedly connected to the outer wall of the driving end of the driving motor 43, and a driven wheel 45 is fixedly mounted on the outer wall of one of the hollow rollers 421. A synchronous belt 46 is connected between the driving wheel 44 and the driven wheel 45;

[0061] Specifically, during operation, the driving motor 43 can drive the driving wheel 44 to rotate, and the driving wheel 44 drives the driven wheel 45 to rotate through the synchronous belt 46. The driven wheel 45 drives one of the crushing rollers 42 to rotate, and the two crushing rollers 42 rotate relative to each other through the meshing transmission of the transmission gear 48, thereby crushing the plastic entering the crushing box 41.

[0062] In order to facilitate the discharge of the crushed plastic from the crushing box 41, refer to Figure 2 and Figure 3 The discharging assembly 5 includes a discharging barrel 51 fixedly mounted at the bottom end of the crushing box 41, a discharging port 52 and a collecting port 53 are arranged on the outer wall of the discharging barrel 51, the collecting port 53 is connected with the crushing box 41, a rotating shaft 54 ​​is rotatably mounted inside the discharging barrel 51, a spiral auger 56 is fixedly mounted on the outer wall of the rotating shaft 54, one end of the rotating shaft 54 ​​passes through the side wall of the discharging barrel 51 and is connected with a coupling 55, and the discharging barrel 51 is connected with the driving end of the driving motor 43 through the coupling 55;

[0063] Specifically, during operation, the crushed plastic enters the discharge barrel 51 through the collecting port 53, and the rotating shaft 54 ​​is driven by the driving motor 43 to rotate, and the rotating shaft 54 ​​drives the spiral auger 56 to rotate inside the discharge barrel 51. During the rotation of the spiral auger 56, the plastic inside the discharge barrel 51 can be transported to the discharge port 52 for discharge.

[0064] In order to realize the automatic conveying of the plastic raw materials into the interior of the crushing component 4, refer to Figure 1 The conveying device includes a conveying mechanism 1, a receiving bin 2 and a feeding bin 3. The conveying mechanism 1 includes a conveying platform 11, a conveying roller 12 rotatably installed inside the conveying mechanism 1, a conveying belt 13 drivingly connected to the conveying roller 12, a conveying motor 14 fixedly installed on the outer wall of the conveying platform 11 for driving the conveying roller 12 to rotate, and a support frame 15 connected to the bottom surface of the conveying platform 11 for supporting the conveying platform 11. A material discharge port is arranged on the side wall of the upper port of the conveying platform 11, the receiving bin 2 is fixedly connected to the bottom surface of the material discharge port, the feeding bin 3 is welded to the side of the receiving bin 2 away from the conveying mechanism 1, and the feeding bin 3 cover is arranged on the top of the crushing component 4;

[0065] Specifically, during operation, the conveying motor 14 drives the conveying roller 12 to rotate, and the conveying roller 12 drives the actually installed conveyor belt 13 to transmit, so that the plastic raw materials can be transported to the interior of the receiving bin 2, and then enter the interior of the feeding bin 3 from the receiving bin 2, and then fall into the interior of the crushing component 4 from the feeding bin 3, thereby achieving the effect of automatic loading and reducing manpower.

[0066] The present invention provides a method for processing a flame retardant sheet, comprising the following steps:

[0067] S1. Pretreatment: The polypropylene plastic is conveyed by the conveying mechanism 1. The polypropylene plastic conveyed by the conveying mechanism 1 enters the crushing component 4 for crushing. The crushed plastic raw material is discharged through the discharging component 5. The plastic raw material is then screened, impurity-removed and dried to ensure the purity and quality of the plastic raw material.

[0068] S2. Mixing: The pretreated plastic raw materials, inorganic flame retardants and organic flame retardants are sent to the mixing device for mixing in a certain proportion, and the mixing temperature and time are controlled to ensure that the raw materials are mixed evenly.

[0069] S3, granulation: the mixed raw materials are sent to a granulation device for granulation treatment to obtain a granular flame retardant material.

[0070] S4, molding: the granulated flame retardant material is sent to the molding device for processing, and the flame retardant sheet of the desired shape is obtained by controlling parameters such as molding temperature, pressure and speed.

[0071] S5. Curing: The formed flame retardant sheet is cured. By controlling the curing temperature and time, the flame retardant sheet can obtain good mechanical properties and flame retardant properties.

Claims

1. A flame retardant sheet processing equipment, characterized in that: It includes a conveying device, a crushing device, a mixing device, a granulating device, a molding device and a curing device. The conveying device is used to convey the polypropylene plastic to the crushing device; the crushing device is used to crush the polypropylene plastic; the mixing device is used to mix the polypropylene plastic with the inorganic flame retardant and the organic flame retardant evenly; the granulating device is used to granulate the mixed raw materials; the molding device is used to process the granulated raw materials into flame-retardant sheets of desired shapes; the curing device is used to cure the flame-retardant sheets after molding; The crushing device comprises a crushing assembly (4), a discharging assembly (5) and a cleaning assembly (6); the crushing assembly (4) comprises a crushing box (41), a crushing roller (42) symmetrically mounted inside the crushing box (41) for crushing plastic, and a driving structure for driving the crushing roller (42) to rotate; The cleaning assembly (6) comprises a through shaft (61) inserted into the crushing roller (42), both ends of the through shaft (61) are fixedly connected to a fixing seat (62), the fixing seat (62) is fixedly mounted on the outer wall of the crushing box (41), a plurality of contraction members (63) are equidistantly mounted on the outer wall of the through shaft (61), and a metal folding plate (64) is also arranged on the inner wall of the crushing roller (42), and when the crushing roller (42) rotates, the metal folding plate (64) rotates synchronously and squeezes the contraction member (63); The contraction member (63) comprises a mounting plate (631) fixedly mounted on the outer wall of the through-shaft (61); a plurality of sliding cavities (632) are provided inside the mounting plate (631); a collision rod (633) is slidably mounted inside the sliding cavity (632); one end of the collision rod (633) abuts against the inner wall of the crushing roller (42); the other end of the collision rod (633) is fixedly connected to an axial spring (634); and one end of the axial spring (634) away from the collision rod (633) is fixedly connected to the inner wall of the sliding cavity (632); The crushing roller (42) comprises a roller body (422) with a hollow structure inside and a crushing disk (423) mounted on the outer surface of the roller body (422); the centers of both end surfaces of the roller body (422) are fixedly connected with a hollow roller shaft (421); the hollow roller shaft (421) is rotatably mounted on the side wall of the crushing box (41); the through shaft (61) is inserted into the inside of the hollow roller shaft (421) and the roller body (422); the metal folding plate (64) is made of a flexible metal material; the metal folding plate (64) comprises a mounting portion (641) fixedly connected to the inner wall of the roller body (422); an arc portion (642) is integrally formed on the mounting portion (641); a turning portion (643) is integrally formed on one end of the arc portion (642) away from the mounting portion (641); a connecting portion (644) is connected to the lower part of the turning portion (643); and the connecting portion (644) is slidably connected to the inner wall of the roller body (422); An adjusting mechanism (65) for adjusting the position of the connecting portion (644) is provided on the inner wall of the crushing roller (42); the adjusting mechanism (65) comprises an adjusting groove (651) formed on the inner wall of the roller body (422); a sliding block (652) is slidably connected to the inside of the adjusting groove (651); an end of the connecting portion (644) away from the turning portion (643) is fixedly connected to the sliding block (652); a sealing cavity (653) communicating with the adjusting groove (651) is formed on the side wall of the roller body (422); A piston rod (654) is slidably mounted inside the sealing chamber (653). One end of the piston rod (654) extends into the interior of the adjustment groove (651) and is connected to the side wall of the sliding block (652). The other end of the piston rod (654) is fixedly connected to a piston plate (655). The piston plate (655) slides sealingly inside the sealing chamber (653). The roller body (422) is also provided with an oil storage chamber connected to the sealing chamber (653). The interior of the oil storage chamber is filled with liquid kerosene (656).

2. The flame retardant sheet processing equipment according to claim 1, characterized in that: The driving structure comprises a base (47), a driving motor (43) fixed on the base (47), and two transmission gears (48) fixedly mounted on the outer wall of the hollow roller shaft (421) and arranged in meshing relationship with each other, a driving wheel (44) being fixedly connected to the outer wall of the driving end of the driving motor (43), a driven wheel (45) being fixedly mounted on the outer wall of one of the hollow roller shafts (421), and a synchronous belt (46) being transmission-connected between the driving wheel (44) and the driven wheel (45).

3. The flame retardant sheet processing equipment according to claim 2, characterized in that: The discharging assembly (5) comprises a discharging barrel (51) fixedly mounted at the bottom end of the crushing box (41); a discharging port (52) and a collecting port (53) are arranged on the outer wall of the discharging barrel (51); the collecting port (53) is communicated with the crushing box (41); a rotating shaft (54) is rotatably mounted inside the discharging barrel (51); a spiral auger (56) is fixedly mounted on the outer wall of the rotating shaft (54); one end of the rotating shaft (54) passes through the side wall of the discharging barrel (51) and is connected to a coupling (55); the discharging barrel (51) is connected to the driving end of the driving motor (43) via the coupling (55).

4. The flame retardant sheet processing equipment according to claim 1, characterized in that: The conveying device comprises a conveying mechanism (1), a receiving bin (2) and a feeding bin (3); the conveying mechanism (1) comprises a conveying platform (11), a conveying roller (12) rotatably mounted inside the conveying mechanism, a conveying belt (13) drivingly connected to the conveying roller (12), a conveying motor (14) fixedly mounted on the outer wall of the conveying platform (11) for driving the conveying roller (12) to rotate, and a support frame (15) connected to the bottom surface of the conveying platform (11) for supporting the conveying platform (11); a material discharge port is arranged on the side wall of the upper port of the conveying platform (11); the receiving bin (2) is fixedly connected to the bottom surface of the material discharge port; the feeding bin (3) is welded to a side of the receiving bin (2) away from the conveying mechanism (1), and the feeding bin (3) cover is arranged on the top of the crushing assembly (4).

5. A method for processing the flame-retardant sheet material according to claim 1, characterized in that: The following steps are involved: S1, pretreatment: The polypropylene plastic is conveyed by the conveying mechanism (1), and the polypropylene plastic conveyed by the conveying mechanism (1) enters the crushing component (4) for crushing. After the crushing, the plastic raw material is discharged through the discharge component (5), and then the plastic raw material is screened, impurities are removed and dried to ensure the purity and quality of the plastic raw material; S2, mixing: the pretreated plastic raw materials, inorganic flame retardants and organic flame retardants are sent to the mixing device in a certain proportion for mixing, and the mixing temperature and time are controlled to ensure that the raw materials are mixed evenly; S3, granulation: sending the mixed raw materials into a granulation device for granulation treatment to obtain a granular flame retardant material; S4, molding: the granulated flame retardant material is sent to the molding device for processing, and the flame retardant sheet of the desired shape is obtained by controlling the molding parameters such as temperature, pressure and speed; S5. Curing: The formed flame retardant sheet is cured. By controlling the curing temperature and time, the flame retardant sheet can obtain good mechanical properties and flame retardant properties.

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