Pultrusion system for sandwich profile with complex section

Abstract

The utility model discloses a complex section sandwich profile pultrusion system, including: a molding die, a traction device, a cutting device and a polyurethane foam filling device that are arranged in order, during pultrusion, the traction device can pull carbon fiber to pass through the molding die, under the support of a core film, the molding die can mold the carbon fiber, and the cutting device can cut the carbon fiber through the polyurethane foam filling device. The cutting device can cut the carbon fiber profile, then a core mold in the carbon fiber profile is removed, and finally a polyurethane foaming material is poured into an inner cavity of the carbon fiber profile through the polyurethane foaming filling device. The inner cavity of the carbon fiber profile is filled with the polyurethane foaming material, so that the overall rigidity, compression strength, sound insulation, noise reduction and other properties of the profile can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sandwich profiles, in particular to a pultrusion molding system for sandwich profiles with complex cross-sections. Background Art

[0002] As higher requirements are put forward for the running speed and energy conservation and emission reduction of rail vehicles and high-speed trains, EMUs and subways use extruded profiles such as aluminum alloy and stainless steel, which are assembled into body structures through welding, riveting and other connection processes. However, the metal body is heavy, has low specific strength and rust, which affects the requirements of high running speed and energy conservation and emission reduction, and also reduces its service life.

[0003] Therefore, how to improve the strength of the profile is a technical problem that technical personnel in this field currently need to solve. Utility Model Content

[0004] The utility model aims to provide a pultrusion system for sandwich profiles with complex cross-sections, which can effectively improve the strength and sound insulation performance of the profiles.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A complex cross-section sandwich profile pultrusion system comprises: a forming die, a traction device, a cutting device and a polyurethane foam filling device which are arranged in sequence, wherein the forming die is used to form carbon fibers under the support of a core film to form a carbon fiber profile, the traction device is used to pull the carbon fibers through the forming die, the cutting device is used to cut the carbon fiber profile, and the polyurethane foam filling device is used to infuse polyurethane foam into the inner cavity of the carbon fiber profile after the core film is removed.

[0007] Preferably, the forming mold comprises a preforming mold and a curing forming mold which are arranged in sequence, the preforming mold is used to preform the carbon fiber, and the curing forming mold is used to cure the carbon fiber profile.

[0008] Preferably, the molding mold further comprises a glue injection mold, which is arranged between the pre-molding mold and the curing molding mold, and is used for injecting glue into the pre-molded prefabricated profile.

[0009] Preferably, the traction device comprises a first clamping component and a second clamping component which are arranged in sequence, and the first clamping component and the second clamping component are used for clamping the sandwich profile.

[0010] Preferably, the polyurethane foam filling device comprises a two-component filling supply unit and a mixer, the mixer is connected to the two-component filling supply unit, and the two-component filling supply unit is used to convey the filling material to the mixer.

[0011] Preferably, the polyurethane foam filling device further comprises a flow divider connected to the mixer, and the flow divider is used to transport the polyurethane foam material into the multiple inner cavities of the carbon fiber profile.

[0012] Preferably, the two-component filling supply unit includes an ether polyol composition supply unit and an isocyanate supply unit.

[0013] Preferably, the polyurethane foam filling device further comprises a foaming and curing unit, and the foaming and curing unit is used to perform foaming and curing treatment on the carbon fiber profile after being filled with the polyurethane foam material.

[0014] Preferably, the curing molding die comprises three heating zones arranged in sequence, and the heating temperatures of the three heating zones are 150°C, 170°C, and 170°C in sequence.

[0015] Preferably, a water cooling unit is also provided at the inlet of the curing molding mold.

[0016] Compared with the prior art, the above technical solution has the following advantages:

[0017] The utility model provides a complex cross-section sandwich profile pultrusion system, comprising: a molding die, a traction device, a cutting device and a polyurethane foam filling device arranged in sequence. When pultrusion is performed, the traction device can pull carbon fiber through the molding die. Under the support of the core film, the molding die can mold the carbon fiber to form a carbon fiber profile. The cutting device can cut the carbon fiber profile, and then remove the core mold in the carbon fiber profile. Finally, the polyurethane foam is poured into the inner cavity of the carbon fiber profile through the polyurethane foam filling device. By filling the inner cavity of the carbon fiber profile with polyurethane foam, the overall stiffness, compression strength, and sound insulation and noise reduction performance of the profile can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0019] Figure 1 A schematic structural diagram of a complex cross-section sandwich profile pultrusion system provided by an embodiment of the utility model;

[0020] Figure 2A partial structural schematic diagram of a complex cross-section sandwich profile pultrusion system provided by an embodiment of the utility model;

[0021] Figure 3 Schematic diagram of the structure of carbon fiber profile.

[0022] The reference numerals are as follows:

[0023] 100 is carbon fiber, 200 is carbon fiber profile, 201 is inner cavity, and 300 is core membrane;

[0024] 10 is a forming mold, 11 is a preforming mold, 12 is a glue injection mold, and 13 is a curing molding mold;

[0025] 20 is a traction device, 21 is a first clamping component, and 22 is a second clamping component;

[0026] 30 is a cutting device;

[0027] 40 is a polyurethane foaming and filling device, 41 is an ether polyol composition supply unit, 42 is an isocyanate supply unit, 43 is a mixer, and 44 is a splitter. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Please refer to Figure 1 to Figure 3 , Figure 1 A schematic structural diagram of a complex cross-section sandwich profile pultrusion system provided by an embodiment of the utility model; Figure 2 A partial structural schematic diagram of a complex cross-section sandwich profile pultrusion system provided by an embodiment of the utility model; Figure 3 Schematic diagram of the structure of carbon fiber profile.

[0030] A complex cross-section sandwich profile pultrusion system provided by the embodiment of the utility model comprises: a forming die 10, a traction device 20, a cutting device 30 and a polyurethane foam filling device 40 which are arranged in sequence. When pultrusion is performed, the traction device 20 can pull carbon fiber through the forming die 10. Under the support of the core film 300, the forming die 10 can form the carbon fiber 100 to form a carbon fiber profile 200. The cutting device 30 can cut the carbon fiber profile 200. Specifically, the carbon fiber profile 200 can be cut at a fixed distance according to the design and processing length requirements, and then the core mold in the carbon fiber profile 200 is removed. Finally, the polyurethane foam is poured into the inner cavity of the carbon fiber profile 200 through the polyurethane foam filling device 40. By filling the inner cavity of the carbon fiber profile 200 with polyurethane foam, the overall stiffness, compression strength, and sound insulation and noise reduction properties of the profile can be improved.

[0031] In some embodiments, Figure 2 As shown, the molding die 10 includes a pre-molding die 11, a glue injection die 12 and a curing molding die 13 which are arranged in sequence. The glue injection die 12 is arranged between the pre-molding die 11 and the curing molding die 13. The pre-molding die 11 can pre-mold the carbon fiber. Figure 3As shown, the carbon fiber profile 200 is a hollow cavity structure, and has 10 inner cavities 201 in the profile. The thickness of the upper and lower plates of the carbon fiber profile 200 is 4mm, the thickness of the vertical rib plate of the inner cavity is 3mm, and the fiber volume content is 63%. In order to ensure the strength of the carbon fiber profile 200 and the fiber volume content of each part, 1600 grams of carbon fiber four-axial cloth is used for laying on the upper and lower plates of the profile and the periphery of the cavity, and 48K carbon fiber unidirectional yarn is used for local filling at the corner of the cavity to ensure that the fiber volume content of each part of the profile is consistent. Specifically, the fiber cloth passes through the preformed plate in turn, and the fiber reinforcement material is gradually formed into the designed shape during the preforming to ensure that the fiber and the fiber cloth / felt can smoothly transition to a suitable shape to form the cross-sectional shape of the profile. The glue injection mold 12 can be used to inject glue into the preformed prefabricated profile. The glue injection mold 12 can use a two-component epoxy resin material. Specifically, the materials used for injection mainly include resin, curing agent and accelerator, and the ratio is 100:96:4. In addition, the specific gravity of the release agent is 2%, and the specific gravity of the fireproof filler is 4%. Through the method of injection and infiltration, the resin material can be evenly and fully filled into the fiber material. The curing molding mold 13 can perform a curing treatment on the sandwich profile. The curing molding mold 13 includes three heating areas arranged in sequence. The heating temperatures of the three heating areas are 150°C, 170°C, and 170°C respectively. A water cooling unit is also provided at the entrance of the curing molding mold 13. The temperature of the water cooling unit can be selected to be 45°C to ensure the best resin viscosity. In order to ensure the degree of curing of the carbon fiber profile 200, combined with the DSC curve of the two-component epoxy resin, the profile extrusion speed can be set to 80-90mm / min. The extrusion process is as follows Figure 2 shown.

[0032] In some embodiments, Figure 2 As shown, the traction device 20 includes a first clamping component 21 and a second clamping component 22 which are arranged in sequence. The first clamping component 21 and the second clamping component 22 are used to clamp the carbon fiber profile 200. The first clamping component 21 and the second clamping component 22 can improve the pultrusion effect of the carbon fiber profile 200. Generally, the cross-sectional area of ​​the complex cross-section profile is large (7000mm 2 ), so the initial pultrusion speed is 60-80mm / min, and the pultrusion speed is adjusted to 80-100mm / min during normal pultrusion.

[0033] In some embodiments, the polyurethane foaming and filling device 40 includes a two-component filling supply unit, a mixer 43, a diverter 44, and a foaming and curing unit. The mixer 43 is connected to the two-component filling supply unit and the diverter 44 respectively. The two-component filling supply unit is used to transport the filling material to the mixer 43 for mixing. The diverter 44 is used to transport the polyurethane foam material to multiple inner cavities of the carbon fiber profile 200. The foaming and curing unit is used to perform foaming and curing treatment on the carbon fiber profile 200 after the polyurethane foam material is filled. Among them, the two-component filling supply unit includes an ether polyol composition supply unit 41 and an isocyanate supply unit 42. Among them, the ether polyol composition supply unit 41 can provide polyether polyol, catalyst (amine and organic tin), foam stabilizer (dimethylsiloxane), foaming agent (CH2Cl2) and flame retardant (Al(OH)3), etc. The mass ratio of the ether polyol composition and the isocyanate is 1: (1.3-1.6) to obtain a polyurethane foam material. After cleaning the inner cavity of the cut carbon fiber profile 200, one end is blocked, and the glue gun of the polyurethane foam filling device 40 extends into the inner cavity from the other end, and the component flow rate of the two-component filling supply unit is strictly controlled within the range of 8-12g / s, so that the foam production rate is 1.5-2kg / min, the wind pressure of the mixer 43 of the polyurethane foam filling device 40 is controlled within the range of 0.5-0.6MPa, and the nozzle of the polyurethane foam filling device 40 moves in the cavity at a speed of 0.3m / s to ensure that the foam filling of the inner cavity of the profile is full. During filling, by controlling the foaming rate and curing conditions (curing time (not less than 2h) and curing temperature ((22±4)℃), humidity (not higher than 75%), etc.), the polyurethane filling liquid is evenly distributed throughout the entire carbon fiber profile 200, so that the performance of the entire product is uniform and stable.

[0034] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0035] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0036] The above is a detailed introduction to a complex cross-section sandwich profile pultrusion system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A complex cross-section sandwich profile pultrusion system, characterized in that: include: A forming mold (10), a traction device (20), a cutting device (30) and a polyurethane foam filling device (40) are arranged in sequence, wherein the forming mold (10) is used to form carbon fibers (100) under the support of a core film (300) to form a carbon fiber profile (200), the traction device (20) is used to pull the carbon fibers (100) through the forming mold (10), the cutting device (30) is used to cut the carbon fiber profile (200), and the polyurethane foam filling device (40) is used to inject polyurethane foam into the inner cavity (201) of the carbon fiber profile (200) after the core film (300) is removed.

2. The complex cross-section sandwich profile pultrusion system according to claim 1, characterized in that: The forming mold (10) comprises a preforming mold (11) and a curing forming mold (13) which are arranged in sequence, the preforming mold (11) being used to preform the carbon fiber (100), and the curing forming mold (13) being used to perform a curing treatment on the carbon fiber profile (200).

3. The complex cross-section sandwich profile pultrusion system according to claim 2, characterized in that: The molding die (10) further comprises a glue injection die (12), wherein the glue injection die (12) is arranged between the preforming die (11) and the curing molding die (13), and the glue injection die (12) is used for injecting glue into the preformed prefabricated profile.

4. The complex cross-section sandwich profile pultrusion system according to claim 1, characterized in that: The traction device (20) comprises a first clamping component (21) and a second clamping component (22) which are arranged in sequence, and the first clamping component (21) and the second clamping component (22) are used to clamp the carbon fiber profile (200).

5. The complex cross-section sandwich profile pultrusion system according to claim 4, characterized in that: The polyurethane foam filling device (40) comprises a two-component filling supply unit and a mixer (43), wherein the mixer (43) is connected to the two-component filling supply unit, and the two-component filling supply unit is used to convey the filling material to the mixer (43).

6. The complex cross-section sandwich profile pultrusion system according to claim 5, characterized in that: The polyurethane foam filling device (40) further comprises a flow divider (44) connected to the mixer (43), wherein the flow divider (44) is used to transport the polyurethane foam material into the multiple inner cavities (201) of the carbon fiber profile (200).

7. The complex cross-section sandwich profile pultrusion system according to claim 5, characterized in that: The two-component filling supply unit comprises an ether polyol composition supply unit (41) and an isocyanate supply unit (42).

8. The complex cross-section sandwich profile pultrusion system according to claim 5, characterized in that: The polyurethane foaming and filling device (40) further comprises a foaming and curing unit, and the foaming and curing unit is used to perform foaming and curing treatment on the carbon fiber profile (200) after being filled with the polyurethane foaming material.

9. The complex cross-section sandwich profile pultrusion system according to claim 2, characterized in that: The curing molding die (13) comprises three heating zones arranged in sequence, and the heating temperatures of the three heating zones are 150° C., 170° C., and 170° C. in sequence.

10. The complex cross-section sandwich profile pultrusion system according to claim 9, characterized in that: A water cooling unit is also provided at the inlet of the curing and molding mold (13).

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