A recycling system for continuous fiber reinforced thermoplastic composites

Abstract

The application discloses a continuous fiber reinforced thermoplastic composite material recycling system which can effectively reduce energy consumption, reduce recycling cost and avoid secondary waste production. The continuous fiber reinforced thermoplastic composite material recycling system comprises a waste recycling device, a conveying device, a double-screw extruder, a discharging heat preservation cabin and a mold pressing forming device; the material extrusion outlet at one end of the double-screw extruder is communicated with the discharging heat preservation cabin; the conveying barrel of the extruder is provided with a fat matrix feeding port and a waste inlet above one end; the conveying device is arranged between the waste recycling device and the waste inlet; the discharging heat preservation cabin is provided with a discharging port; the discharging port of the discharging heat preservation cabin is provided with a material adjusting device; and the mold pressing forming device provides mold pressing forming raw materials through the material adjusting device. The continuous fiber reinforced thermoplastic composite material recycling system can improve recycling efficiency, reduce recycling cost and avoid secondary pollution.

Description

Technical Field

[0001] This invention relates to the field of composite material waste recycling, and in particular to a recycling system for continuous fiber reinforced thermoplastic composite materials. Background Technology

[0002] As is well known, composite materials are novel materials formed by combining several different materials through composite technology. The widespread application of composite materials has brought about a series of new problems, namely the recycling of composite material waste. The diversity and complexity of composite materials make their recycling and reuse a challenging problem.

[0003] Currently, the main recycling methods for thermoplastic composites are remelting and remodeling and chemical methods, among which remelting and remodeling are more widely used.

[0004] Chinese invention patent CN113858487 A discloses a device and method for recycling carbon fiber reinforced polyether ether ketone composite materials from waste gas. This invention uses a self-made diphenyl sulfone circulating heating device with self-sealing, which solves the problem of high viscosity and poor flow of polyether ether ketone, and realizes the recycling of composite materials. However, this patent introduces new chemical substances that are not easy to remove 100%. In addition, after the waste gas composite material is washed, it needs to be dried at a temperature of 20-40℃ for 2-3 days, resulting in low production efficiency.

[0005] Chinese invention patent CN111267266 A discloses a method for recycling fiber-reinforced composite materials. The method involves first subjecting the fiber-reinforced composite material to low-temperature treatment under liquid nitrogen, causing it to become brittle, followed by mechanical crushing, and finally screening the crushed matrix material and reinforcing material through a screening device. This method increases the recycling cost of the composite material due to the introduction of nitrogen, and the matrix material and reinforcing material cannot be 100% separated.

[0006] Chinese invention patent CN 114769294 A discloses an efficient recycling system and method for resin-based composite material waste, which relates to the field of carbon fiber recycling equipment technology.

[0007] This efficient recycling system and method for resin-based composite material waste involves fixing carbon fiber resin composite materials to a support frame using a supporting partition and feeding them into a heating furnace tube. After vacuuming, argon gas is introduced, and a microwave generator is activated to heat the material and cause it to decompose. After the decomposition reaction is complete, air / oxygen is introduced, and an electric heating tube is activated to oxidize and remove carbon from the decomposition products, efficiently recovering the carbon fibers. The resulting liquid is collected in a collection crucible and then flows into a collection and separation system. The generated high-temperature gas is discharged through an exhaust port and enters a waste heat recovery system, where it transfers heat to n-pentane in a heat exchange pipe. The n-pentane vaporizes and drives the turbine blades to generate electricity. The high-temperature gas after heat exchange condenses and flows into the collection and separation system. Based on the differences in the boiling points of the liquid products after decomposition, the heating temperature range of the heating furnace chamber is controlled, and the condensed liquid is heated, vaporized, and collected into different collection tanks.

[0008] This method involves high-temperature pyrolysis of carbon fiber resin composites, which requires a large amount of energy during the pyrolysis process. Furthermore, the process is complex, resulting in high costs, high energy consumption, and difficulty in energy conservation and emission reduction. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide a recycling system for continuous fiber reinforced thermoplastic composite materials that can effectively reduce energy consumption, reduce recycling costs, and generate no secondary waste.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a recycling system for continuous fiber reinforced thermoplastic composite materials, including a waste recycling device, a conveying device, a twin-screw extruder, a discharge insulation chamber, and a compression molding device;

[0011] The twin-screw extruder has a twin-screw barrel; one end of the twin-screw barrel is the output end, and the other end is equipped with a drive device; the material extrusion port of the output end is connected to the discharge insulation chamber.

[0012] The twin-screw extruder has a resin matrix inlet and a waste inlet at one end; the distance between the resin matrix inlet and the waste inlet is 1 / 3 to 1 / 2 of the length of the twin-screw barrel.

[0013] The conveying device is located between the waste recycling device and the waste inlet; the discharge insulation chamber has a discharge port; the discharge port of the discharge insulation chamber is equipped with a material regulating device; the molding device provides molding raw materials through the material regulating device.

[0014] Furthermore, the conveying device employs an unwinding device; the waste recycling device includes a winding device; or the waste recycling device includes a fiber crusher, a powder heating device, a belt press, and a winding device arranged sequentially.

[0015] Furthermore, the tape press includes a base; a housing is provided on the base; the housing has an inner cavity; and a hopper communicating with the inner cavity is provided above the housing.

[0016] The inner cavity is provided with two sets of pressure rollers, one upper and one lower; each set of pressure rollers has two pressure rollers; and there is a gap between the two pressure rollers.

[0017] A guide plate is provided at the bottom of the inner cavity; a discharge channel is formed between the guide plate and a pressure roller at the bottom of the inner cavity; a discharge chamber is provided on one side of the lower end of the box; the discharge chamber has a discharge port; a transition roller and a pressure roller group are arranged sequentially between the discharge channel and the discharge port in the discharge chamber; a drive device for driving the pressure roller to rotate is provided on the back side of the box.

[0018] Furthermore, the driving device includes a housing; a drive motor, a first driven gear, and a second driven gear are disposed within the housing; the drive motor has a drive gear;

[0019] The drive gear meshes with the first driven gear, and the first driven gear meshes with the second driven gear;

[0020] Two transmission gears are provided on both sides of the first driven gear and on both sides of the second driven gear;

[0021] The transmission gears correspond one-to-one with the pressure rollers; the rotating shaft of the pressure rollers is connected to the transmission gears; the transmission gears mesh with the corresponding first driven gear and second driven gear.

[0022] Furthermore, the molding apparatus includes a turntable base; a turntable is mounted on the turntable base; a feeding device is mounted on one side of the turntable base; a pressing device is mounted on one side of the feeding device; a sealing plate is mounted between the feeding device and the pressing device; at least three cavity mold boxes are evenly distributed along the circumference on the turntable, and a detachable cavity mold is mounted inside each cavity mold box; a punch matching the cavity mold is mounted on the pressing device; and a turntable drive motor for driving the turntable to rotate is mounted at the center of the turntable base.

[0023] The positions of the feeding device and the molding device correspond to the positions of two adjacent concave mold boxes, respectively.

[0024] Furthermore, the inner cavity has an opening on one side of the box body, and the opening is equipped with an openable and closable sealing door.

[0025] The beneficial effects of this invention are as follows: The recycling system for continuous fiber reinforced thermoplastic composite materials described in this invention recycles the waste materials of the composite materials through a waste recycling device, mixes the waste materials with a certain proportion of resin through a twin-screw extruder, then keeps the extruded material warm through an outlet insulation chamber, and finally uses a compression molding device to compress the extruded material to prepare recycled products. This allows the waste materials of the composite materials to be fully utilized, converting all the waste materials into recycled products as raw materials, and no secondary waste is generated in this process; moreover, the energy consumption is low.

[0026] Secondly, since the twin-screw extruder has two feed ports, namely the resin matrix feed port and the waste feed port, the fiber content can be determined and designed: the entire recycling process involves continuous fiber-reinforced thermoplastic composite material and resin matrix, and the fiber content in both materials is a fixed value. The fiber content can be adjusted by the amount of resin matrix added through the resin matrix feed port.

[0027] Furthermore, the entire recycling system is environmentally friendly, requiring no additional chemicals during the entire recycling process and thus avoiding secondary pollution.

[0028] Finally, the entire recycling process was carried out without interruption, ensuring the continuous and efficient recycling of composite materials. Attached Figure Description

[0029] Figure 1 This is a perspective view of the recycling system of continuous fiber reinforced thermoplastic composite material in an embodiment of the present invention;

[0030] Figure 2 This is a front view of the recycling system for continuous fiber reinforced thermoplastic composite materials in an embodiment of the present invention;

[0031] Figure 3 This is a top view of the recycling system for continuous fiber reinforced thermoplastic composite materials in an embodiment of the present invention;

[0032] Figure 4 This is a perspective view of the material receiving device in an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the material receiving device in an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the drive device structure of the receiving device in an embodiment of the present invention;

[0035] Figure 7 This is a perspective view of the molding apparatus in an embodiment of the present invention;

[0036] Figure 8 This is a top view of the molding apparatus in an embodiment of the present invention;

[0037] Figure 9 This is a front view of the molding apparatus in an embodiment of the present invention;

[0038] The diagram indicates: 1-Waste recycling device, 10-Fiber pulverizer, 20-Powder heating device, 30-Belt press, 40-Rewinding device; 11-Box body, 12-Inner cavity, 13-Feed hopper, 14-Guide plate, 15-Pressure roller, 16-Guide plate, 17-Discharge chamber, 18-Transition roller, 19-Pressure roller group, 2-Conveying device, 3-Twin screw extruder, 31-Output end, 32-Heating device, 33-Resin matrix inlet, 34- 4-Waste inlet, 5-Discharge insulation chamber, 6-Material adjustment device, 7-Molding device, 8-Turntable base, 9-Turntable, 10-Feeding device, 11-Feeding pipe, 12-Molding device, 13-Sealing plate, 14-Die box, 15-Die, 16-Turntable drive motor, 17-Drive device, 18-Housing, 19-Drive motor, 10-Drive gear, 11-First driven wheel, 12-Second driven wheel, 13-Transmission gear. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] like Figures 1 to 9 As shown, the recycling system for a continuous fiber reinforced thermoplastic composite material of the present invention includes a waste recycling device 1, a conveying device 2, a twin-screw extruder 3, a discharge insulation chamber 4, and a compression molding device 6.

[0041] The twin-screw extruder 3 has a twin-screw barrel; one end of the twin-screw barrel is an output end 31; the other end is equipped with a drive device, and the output end 31 is equipped with a heating device 32; the material extrusion port of the output end 31 is connected to the discharge heat preservation chamber 4.

[0042] The twin-screw extruder 3 is provided with a resin matrix inlet 33 and a waste inlet 34 at one end; the distance between the resin matrix inlet 33 and the waste inlet 34 is 1 / 3 to 1 / 2 of the length of the twin-screw barrel.

[0043] The conveying device 2 is located between the waste recycling device 1 and the waste inlet 34; the discharge insulation chamber 4 has a discharge port; the discharge port of the discharge insulation chamber 4 is equipped with a material regulating device 5; the molding device 6 provides molding raw materials through the material regulating device 5.

[0044] In specific applications:

[0045] Waste or trimmed continuous fiber reinforced thermoplastic composite materials are recycled through waste recycling device 1. Specifically, the conveying device 2 adopts an unwinding device. In order to facilitate the processing of waste continuous thermoplastic composite materials, i.e., when it is waste continuous thermoplastic composite material, the waste recycling device 1 includes a winding device 40. The waste material can be directly wound onto the roll through the winding device 40.

[0046] To facilitate the processing of fragmented thermoplastic composite waste, the waste recycling device 1 includes a fiber crusher 10, a powder heating device 20, a belt press 30, and a winding device 40 arranged in sequence.

[0047] First, the fragmented waste material is fed into the fiber crusher 10 for crushing. The crushed waste material is then heated by the powder heating device 20. After heating, it is pressed into a strip by the belt press 30 and then wound onto a roll by the winding device 40. This achieves the recycling of fragmented waste material. Specifically, the powder heating device 20 can be a screw extruder, which can facilitate the conveying of the heated crushed material while heating it.

[0048] After winding is completed, the waste roll is placed on the unwinding device, which is equipped with an automatic unwinding device that can self-adjust according to the production speed and the overall tension requirements of continuous fiber reinforced thermoplastic composite materials.

[0049] The twin-screw extruder forms a replasticization system for continuous fiber-reinforced thermoplastic composites, laying the foundation for the subsequent recycling of the material. The twin-screw extruder 3 includes two feed ports: a resin matrix inlet 33 and a waste inlet 34; which are respectively the resin matrix inlet and the continuous fiber-reinforced thermoplastic composite material inlet.

[0050] After the continuous fiber reinforced thermoplastic composite material is plasticized by the composite material reshaping system, the plasticized composite material has high temperature characteristics. In order to ensure the continuous efficiency of subsequent processes, the plasticized composite material is placed in the discharge insulation chamber 4. Specifically, the discharge insulation chamber 4 can achieve a temperature of 400°C or lower.

[0051] The material in the discharge insulation chamber 4 is transferred to the compression molding die 8 for compression molding to produce recycled products, thereby realizing the recycling of continuous fiber reinforced thermoplastic composite materials. Specifically, in order to control the amount of material added, the discharge port of the discharge insulation chamber 4 is equipped with a material regulating device 5; the compression molding device 6 provides the compression molding raw material through the material regulating device 5; the material regulating device 5 can control the amount of material added to the compression molding device 6; thus ensuring sufficient compression molding raw material while avoiding material waste.

[0052] In summary, the continuous fiber reinforced thermoplastic composite material recycling system of the present invention recycles composite material waste through a waste recycling device, mixes the waste with a certain proportion of resin through a twin-screw extruder, then keeps the extruded material warm through an outlet insulation chamber, and finally uses a compression molding device to compress the extruded material into recycled products. This fully utilizes the composite material waste, converting all waste into recycled products, without generating secondary waste, and with low energy consumption.

[0053] Secondly, since the twin-screw extruder has two feed ports, namely the resin matrix feed port and the waste feed port, the fiber content can be determined and designed: the entire recycling process involves continuous fiber-reinforced thermoplastic composite material and resin matrix, and the fiber content in both materials is a fixed value. The fiber content can be adjusted by the amount of resin matrix added through the resin matrix feed port.

[0054] Furthermore, the entire recycling system is environmentally friendly, requiring no additional chemicals to be added during the entire recycling process;

[0055] Finally, the entire recycling process was carried out without interruption, ensuring the continuous and efficient recycling of composite materials.

[0056] To facilitate the formation of recycled material into a roll, in one feasible embodiment, the receiving device includes a base 111; a box 11 is provided on the base 111; the box 11 has an inner cavity 12; and a hopper 13 communicating with the inner cavity 12 is provided above the box 11.

[0057] The inner cavity 12 is provided with two sets of pressure rollers, one upper and one lower; and each set of pressure rollers has two pressure rollers 15; there is a gap between the two pressure rollers 15.

[0058] A guide plate 16 is provided at the bottom of the inner cavity 12; a discharge channel is formed between the guide plate 16 and a pressure roller 15 at the bottom of the inner cavity 12; a discharge chamber 17 is provided on one side of the lower end of the box body 11; the discharge chamber 17 has a discharge port; a transition roller 18 and a pressure roller group 19 are arranged sequentially between the discharge channel and the discharge port in the discharge chamber 17; a drive device 7 for driving the pressure roller 15 to rotate is provided on the back side of the box body 11.

[0059] To facilitate the driving of the pressure roller 15, in a feasible embodiment, the driving device 7 includes a housing 71; the housing 71 is provided with a drive motor 72, a first driven gear 74, and a second driven gear 75; the drive motor 72 has a drive gear 73;

[0060] The drive gear 73 meshes with the first driven gear 74, and the first driven gear 74 meshes with the second driven gear 75;

[0061] Two transmission gears 76 are provided on both sides of the first driven gear 74 and on both sides of the second driven gear 75;

[0062] The transmission gear 76 corresponds one-to-one with the pressure roller 15; the rotating shaft of the pressure roller 15 is connected to the transmission gear 76; the transmission gear 76 meshes with the corresponding first driven gear 74 and second driven gear 75.

[0063] Specifically, in the working process, the drive motor 72 drives the drive gear 73 to rotate, the drive gear 73 drives the first driven gear 74 and the second driven gear 75 to rotate, the first driven gear 74 and the second driven gear 75 drive the transmission gear 76 to rotate, and the transmission gear 76 drives the pressure roller 15 to rotate.

[0064] To facilitate continuous operation of the compression mold, in one feasible embodiment, the compression molding device 6 includes a turntable base 61; a turntable 62 is provided on the turntable base 61.

[0065] A feeding device 63 is provided on one side of the turntable base 61; a pressing device 64 is provided on one side of the feeding device 63; a sealing plate 65 is provided between the feeding device 63 and the pressing device 64; at least three concave mold boxes 66 are provided on the turntable 62, evenly distributed along the circumference, and a detachable concave mold 67 is provided inside the concave mold box 66; a punch matching the concave mold 67 is provided on the pressing device 64; a turntable drive motor 68 for driving the turntable 62 to rotate is provided at the center of the turntable base 61.

[0066] The positions of the feeding device 63 and the molding device 64 correspond to the positions of two adjacent concave mold boxes 66, respectively.

[0067] In a specific application: a corresponding die is installed inside the die box 66, and then the turntable 62 is rotated; so that one die box 66 on the turntable 62 is located below the feeding device 63, the feeding device 63 adjusts the material into the die, and then the turntable 62 continues to rotate; so that the die box 66 after adding material rotates to the bottom of the pressing device 64 to achieve film pressing; at this time, another die box 66 is located below the feeding device 63, and the feeding device 63 achieves material feeding.

[0068] After the molding process is completed, the drive turntable 62 rotates, causing the molded cavity 66 to rotate into an empty position, thus enabling demolding and removal of the recycled product. At this time, the next molded cavity 66 rotates to the bottom of the molding device 64 to perform molding; thereby realizing continuous production of molding.

[0069] To facilitate maintenance of the receiving device, in one feasible embodiment, the inner cavity 12 is provided with an opening on one side of the box 11, and the opening is provided with an openable and closable sealing door 110.

Claims

1. A recycling system for continuous fiber-reinforced thermoplastic composite materials, characterized in that: It includes a waste recycling device (1), a conveying device (2), a twin-screw extruder (3), a discharge insulation chamber (4), and a compression molding device (6); The twin-screw extruder (3) has a twin-screw barrel; one end of the twin-screw barrel is an output end (31), and the other end is equipped with a drive device. The material extrusion port of the output end (31) is connected to the discharge insulation chamber (4). The twin-screw extruder (3) has a resin matrix inlet (33) and a waste inlet (34) at one end; the distance between the resin matrix inlet (33) and the waste inlet (34) is 1 / 3 to 1 / 2 of the length of the twin-screw barrel. The conveying device (2) is located between the waste recycling device (1) and the waste inlet (34); the discharge insulation chamber (4) has a discharge port; the discharge port of the discharge insulation chamber (4) is equipped with a material regulating device (5); the molding device (6) provides molding raw materials through the material regulating device (5); The conveying device (2) adopts an unwinding device; the waste recycling device (1) includes a fiber crusher (10), a powder heating device (20), a belt press (30), and a winding device (40) arranged in sequence; The belt pressing machine (30) includes a base (111); a box (11) is provided on the base (111); the box (11) has an inner cavity (12); and a hopper (13) communicating with the inner cavity (12) is provided above the box (11); The inner cavity (12) is provided with two sets of pressure rollers, one upper and one lower; and each set of pressure rollers has two pressure rollers (15); there is a gap between the two pressure rollers (15); A guide plate (16) is provided at the bottom of the inner cavity (12); a discharge channel is formed between the guide plate (16) and a pressure roller (15) at the bottom of the inner cavity (12); a discharge chamber (17) is provided on one side of the lower end of the box (11); the discharge chamber (17) has a discharge port; a transition roller (18) and a pressure roller group (19) are arranged in sequence between the discharge channel and the discharge port in the discharge chamber (17); a drive device (7) for driving the pressure roller (15) to rotate is provided on the back side of the box (11); The molding device (6) includes a turntable base (61); a turntable (62) is provided on the turntable base (61); A feeding device (63) is provided on one side of the turntable base (61); a pressing device (64) is provided on one side of the feeding device (63); a sealing plate (65) is provided between the feeding device (63) and the pressing device (64); at least three concave mold boxes (66) are provided on the turntable (62) evenly distributed along the circumference, and a detachable concave mold (67) is provided inside the concave mold box (66); a punch matching the concave mold (67) is provided on the pressing device (64); a turntable drive motor (68) for driving the turntable (62) to rotate is provided at the center of the turntable base (61). The positions of the feeding device (63) and the molding device (64) correspond to the positions of two adjacent concave mold boxes (66), respectively.

2. The recycling system for continuous fiber-reinforced thermoplastic composite materials as described in claim 1, characterized in that: The drive device (7) includes a housing (71); a drive motor (72), a first driven gear (74), and a second driven gear (75) are disposed inside the housing (71); the drive motor (72) has a drive gear (73); The drive gear (73) meshes with the first driven gear (74), and the first driven gear (74) meshes with the second driven gear (75); Two transmission gears (76) are provided on both sides of the first driven gear (74) and both sides of the second driven gear (75); The transmission gear (76) corresponds one-to-one with the pressure roller (15); the rotating shaft of the pressure roller (15) is connected to the transmission gear (76); the transmission gear (76) meshes with the corresponding first driven gear (74) and second driven gear (75).

3. The recycling system for continuous fiber-reinforced thermoplastic composite materials as described in claim 2, characterized in that: The inner cavity (12) has an opening on one side of the box body (11), and a closable sealing door (110) is provided at the opening.

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