Thermoplastic laying head with two-stage hot pressing roller

Abstract

The invention discloses a thermoplastic laying head with a secondary hot pressing roller, and belongs to the technical field of composite material automatic laying, the thermoplastic laying head comprises two symmetrically arranged side plates, a first guide wheel is installed between the bottoms of the two side plates, a laser heating piece is arranged at the advancing end of the first guide wheel, and a secondary heating and pressurizing mechanism is arranged at the end, away from the laser heating piece, of the first guide wheel; the secondary heating and pressurizing mechanism comprises first connecting plates in sliding connection with the side plates, and a plurality of second guide wheels are in transmission connection between the two first connecting plates. On-line in-situ curing and heat preservation and pressure maintaining effects can be achieved, and the situation that a whole part is placed in an autoclave or a press to be subjected to secondary hot pressing after being laid by a traditional laying head is avoided. And by arranging the second guide wheel, the temperature gradient of the left side and the right side of the large pressing roller can be effectively reduced, the interlayer bonding characteristic is improved, and the porosity of laid products is reduced.

Description

Technical Field

[0001] This invention belongs to the field of automatic composite material laying technology, and particularly relates to a thermoplastic laying head with a two-stage hot press roller. Background Technology

[0002] Traditional thermoplastic laying heads rely on a single-stage large pressure roller for compaction. However, due to the high speed and temperature during laying, it is difficult to form the material in one pressure cycle, which easily leads to defects. At the same time, the temperature during thermoplastic laying is extremely high, with the core process area typically requiring temperatures above 400°C. This results in a temperature difference of 200-300°C between the left and right ends of the large pressure roller, as shown in the diagram. Consequently, the material on both sides is prone to thermal stress and other defects due to the extreme temperature difference. Summary of the Invention

[0003] The purpose of this invention is to provide a thermoplastic laying head with a secondary hot press roller to solve the problems existing in the prior art.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a thermoplastic laying head with a secondary hot press roller, comprising two symmetrically arranged side plates, a first guide wheel installed between the bottom of the two side plates, a laser heating element provided at the forward end of the first guide wheel, a secondary heating and pressurizing mechanism provided at the end of the first guide wheel away from the laser heating element, the secondary heating and pressurizing mechanism comprising a first connecting plate fixedly connected to the side plates, and a plurality of second guide wheels being drivenly connected between the two first connecting plates.

[0005] Optionally, the top surface of the first connecting plate is provided with multiple sliding grooves, and the side plate is provided with multiple threaded holes at one end near the first connecting plate. Screws are threaded into the threaded holes, and the screws pass through the sliding grooves and are slidably connected to the sliding grooves.

[0006] Optionally, the bottom of the first connecting plate is provided with a connecting hole, and the two sides of the second guide wheel are respectively installed in the connecting hole.

[0007] Optionally, the second guide roller is a hot press roller.

[0008] Optionally, a first guide wheel cooling mechanism is rotatably connected between the two first connecting plates. The first guide wheel cooling mechanism includes a second connecting plate rotatably connected between the two first connecting plates. A cooling host is fixed to the bottom surface of the second connecting plate, and the opening of the cooling host faces the first guide wheel.

[0009] Optionally, the first connecting plate is provided with a second sliding groove, and the second connecting plate is provided with a limiting post on the side near the second sliding groove, the limiting post being slidably connected in the second sliding groove.

[0010] Optionally, the first connecting plate has a reinforcing rib on the side away from the second guide wheel.

[0011] Optionally, one of the first connecting plates has a wire hole at its center.

[0012] This invention discloses the following technical effects: The first guide roller performs initial laying, the laser heating element preheats the material, and the secondary heating and pressurizing mechanism applies secondary pressure and heating to the material through multiple second guide rollers. The secondary hot press rollers, i.e., the second guide rollers, achieve progressive compaction and thermal temperature compensation, solving the defect problem caused by large temperature and pressure gradients during high-speed laying and improving interlayer bonding. By setting the second guide rollers, the temperature gradient on both sides of the large pressure roller can be effectively reduced. Simultaneously, it ensures that when the thermoplastic material's hot pressing effect on the large pressure roller is insufficient (especially when the laying speed exceeds 60m / min), online secondary hot pressing is performed, improving interlayer adhesion characteristics. This allows for laying efficiencies exceeding 60m / min, improving the efficiency of thermoplastic laying. This invention achieves online in-situ curing and heat preservation and pressure holding effects, avoiding the need for secondary hot pressing of the entire part in a hot press or press after laying by the traditional laying head. From a material performance perspective, primary hot pressing generally has higher reliability than secondary hot pressing. Attached Figure Description

[0013] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 This is a schematic diagram of the thermoplastic laying head with a two-stage hot press roller of the present invention;

[0015] Figure 2 for Figure 1 A magnified view of part A in the image;

[0016] Figure 3 This is a front view of the thermoplastic laying head with a secondary hot press roller of the present invention;

[0017] Figure 4 This is a side view of the thermoplastic laying head with a secondary hot press roller of the present invention.

[0018] Figure label:

[0019] 1. Side plate; 2. First guide wheel; 3. First connecting plate; 4. Second guide wheel; 5. Slide groove; 6. Connecting hole; 7. Second connecting plate; 8. Cooling unit; 9. Second slide groove; 10. Reinforcing rib; 11. Wire hole. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Reference Figures 1 to 4 As shown, this embodiment provides a thermoplastic laying head with a secondary hot press roller, including two symmetrically arranged side plates 1. A first guide wheel 2 is installed between the bottom of the two side plates 1. A laser heating element is provided at the forward end of the first guide wheel 2. A secondary heating and pressurizing mechanism is provided at the end of the first guide wheel 2 away from the laser heating element. The secondary heating and pressurizing mechanism includes a first connecting plate 3 fixedly connected to the side plate 1. A plurality of second guide wheels 4 are drivenly connected between the two first connecting plates 3.

[0023] The first guide roller 2 performs initial laying, and the laser heating element preheats the material. The secondary heating and pressurizing mechanism applies secondary pressurization and heating to the material through multiple second guide rollers 4. The secondary hot press rollers, i.e., the second guide rollers 4, achieve progressive compaction and thermal temperature compensation, solving the defect problem caused by large temperature and pressure gradients during high-speed laying and improving interlayer bonding. By setting the second guide rollers 4, the temperature gradient on both sides of the large pressure roller can be effectively reduced. Simultaneously, it ensures that when the thermoplastic material's hot pressing effect on the large pressure roller is insufficient (especially when the laying speed exceeds 60m / min), online secondary hot pressing is performed, improving interlayer adhesion characteristics. This allows for laying efficiencies exceeding 60m / min, improving the efficiency of thermoplastic laying. This invention enables online in-situ curing and heat preservation and pressure holding effects, avoiding the need for secondary hot pressing of the entire part in a hot press or press after laying with a traditional laying head. From a material performance perspective, primary hot pressing generally offers higher reliability than secondary hot pressing.

[0024] In a further optimized design, the top surface of the first connecting plate 3 is provided with multiple sliding grooves 5, and the side plate 1 is provided with multiple threaded holes at one end near the first connecting plate 3. Screws are threaded into the threaded holes, and the screws pass through the sliding grooves 5 and slide in connection with the sliding grooves 5.

[0025] The pressure of the second guide wheel 4 is adjusted by sliding the first connecting plate 3 within the slide groove 5 using screws. The specific steps for the second guide wheel 4 to operate are: loosening the fixing screws on the side plate 1; pushing the first connecting plate 3 downwards along the slide groove 5; tightening the screws to bring the second guide wheel 4 into contact with the material at the set pressure; and activating the laser heating and hot press roller heating system. The adjustable structure adapts to materials of different thicknesses, ensuring uniform pressure distribution and avoiding localized stress concentration. The adjustable guide wheel mechanism accommodates a thickness range of 0.5-5mm and, in conjunction with laser power adjustment, achieves wide-range process parameter adaptation. Secondary pressurization eliminates initial air bubble defects, and, in conjunction with the active cooling system, controls the defect rate to below 0.3%.

[0026] To further optimize the design, the bottom of the first connecting plate 3 is provided with a connecting hole 6, and the two sides of the second guide wheel 4 are respectively installed in the connecting hole 6.

[0027] The design was further optimized so that the second guide roller 4 is a hot press roller.

[0028] The second guide roller 4 is rotatably connected to the first connecting plate 3 through the connecting hole 6, achieving rolling pressurization. Rolling contact reduces material dragging damage and ensures continuous and stable pressurization. The second guide roller 4 acts as a hot press roller, undergoing secondary heating during pressurization. The hot press composite process promotes resin flow and wetting, increasing interlayer bonding strength by more than 30%.

[0029] In a further optimized design, a first guide wheel cooling mechanism is rotatably connected between the two first connecting plates 3. The first guide wheel cooling mechanism includes a second connecting plate 7 rotatably connected between the two first connecting plates 3. A cooling host 8 is fixedly attached to the bottom surface of the second connecting plate 7, and the opening of the cooling host 8 faces the first guide wheel 2.

[0030] The cooling host 8 is used to actively cool the first guide wheel 2. The guide wheel cooling mechanism controls the surface temperature of the guide wheel to within 200℃ to prevent the guide wheel from overheating and causing material erosion, thus extending the service life of the equipment.

[0031] In a further optimized design, a second sliding groove 9 is provided on the first connecting plate 3, and a limiting post is provided on the side of the second connecting plate 7 near the second sliding groove 9. The limiting post is slidably connected in the second sliding groove 9.

[0032] The limiting post slides within the second slide groove 9, controlling the movement range of the second connecting plate 7. This precisely controls the distance between the cooling unit 8 and the guide wheel, achieving a highly efficient and controllable cooling effect.

[0033] In a further optimized design, a reinforcing rib 10 is provided on the side of the first connecting plate 3 away from the second guide wheel 4. The reinforcing rib 10 enhances the deformation resistance of the first connecting plate 3.

[0034] In a further optimized design, a wire-passing hole 11 is provided in the center of one of the first connecting plates 3. The wire-passing hole 11 is used to pass through the control circuit and connect it to the cooling host 8.

[0035] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A thermoplastic laying head with a two-stage hot press roller, characterized in that: It includes two symmetrically arranged side plates (1), and a first guide wheel (2) is installed between the bottom of the two side plates (1). The forward end of the first guide wheel (2) is provided with a laser heating element, and the end of the first guide wheel (2) away from the laser heating element is provided with a secondary heating and pressurizing mechanism. The secondary heating and pressurizing mechanism includes a first connecting plate (3) that is slidably connected to the side plate (1), and a plurality of second guide wheels (4) are drivenly connected between the two first connecting plates (3).

2. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: The top surface of the first connecting plate (3) is provided with multiple sliding grooves (5), and the side plate (1) is provided with multiple threaded holes at one end near the first connecting plate (3). Screws are threaded into the threaded holes, and the screws pass through the sliding grooves (5) and are slidably connected to the sliding grooves (5).

3. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: The bottom of the first connecting plate (3) is provided with a connecting hole (6), and the two sides of the second guide wheel (4) are respectively installed in the connecting hole (6).

4. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: The second guide wheel (4) is a hot press roller.

5. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: A first guide wheel cooling mechanism is rotatably connected between the two first connecting plates (3). The first guide wheel cooling mechanism includes a second connecting plate (7) rotatably connected between the two first connecting plates (3). A cooling host (8) is fixed to the bottom surface of the second connecting plate (7). The opening of the cooling host (8) faces the first guide wheel (2).

6. The thermoplastic laying head with a secondary hot press roller according to claim 5, characterized in that: The first connecting plate (3) is provided with a second sliding groove (9), and the second connecting plate (7) is provided with a limiting post on the side near the second sliding groove (9), and the limiting post is slidably connected in the second sliding groove (9).

7. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: The first connecting plate (3) is provided with a reinforcing rib (10) on the side away from the second guide wheel (4).

8. The thermoplastic laying head with a secondary hot press roller according to claim 1, characterized in that: One of the first connecting plates (3) has a wire hole (11) at its center.

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