Composite material square box constant-force curing pressurizing device

Abstract

According to the constant-force curing and pressurizing device and method for the composite material square box, compared with a mode of pressurizing and curing by winding a cloth bag, the problem that four surfaces of the composite material square box protrude outwards is solved, and the quality of a product is improved; compared with rigid plate pressurization curing, the device can keep the pressure constant and uniform when the composite material square box is cured, and ensures the stability of the curing process and the curing quality. The whole curing and pressurizing device is convenient and fast in structure and easy to operate, provides an effective and feasible solution for curing and pressurizing of the composite square box, and is suitable for large-scale industrial use and popularization.

Description

Technical Field

[0001] This utility model belongs to the field of composite material structure manufacturing, and specifically relates to a constant force curing and pressurizing device for composite material square boxes. Background Technology

[0002] Resin-based composite materials require comprehensive pressurization during the curing process. Existing curing pressurization technologies mainly include gas pressurization, fabric wrapping pressurization, and rigid plate pressurization.

[0003] Among them, gas pressurization is generally carried out in an autoclave. There are no special requirements for the shape of the product, but it is only applicable to products that are dry-wound.

[0004] Wrapped fabric bag pressure and rigid plate pressure are suitable for products made by wet winding. When using the wrapped fabric bag pressure method to cure a square-shaped composite material box, all four sides of the square composite material cylinder show outward bulging. The reason for this is that for products with a square cross-section, the force on any one side of the wrapped fabric bag is a plate beam with two fixed edges, and it is a flexible plate beam. In this way, the air pressure generated by the volatiles of the composite material during the curing process acts on the above-mentioned flexible fabric bag plate beam, forming an outward deflection, which presents the outward bulging phenomenon.

[0005] When using a rigid plate for pressure, the plate is usually loose after curing, resulting in insufficient curing pressure and poor curing effect. This is due to two reasons: firstly, the surface roughness of the composite material box is relatively large; secondly, the resin in the matrix flows during the curing process of the composite material, causing the rigid pressure plate, which is compressed before curing, to shift as the resin flows after curing, resulting in a gap between the rigid plate and the composite material box, causing it to loosen.

[0006] In summary, the current methods of pressurizing with wound fabric bags and rigid plates are not suitable for the curing and pressurizing of square composite material cylinders, and new pressurizing devices need to be explored. Utility Model Content

[0007] The purpose of this invention is to provide a constant-force curing pressurization device for composite material square boxes, so as to solve the problem that the pressurization devices in the prior art are not suitable for square composite material cylinders.

[0008] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0009] A constant force curing and pressurizing device for composite material square boxes includes a winding mandrel, on which a composite material square box formed by winding is disposed, and also includes an L-shaped back plate, two flat pressure plates of the same shape and multiple square hoop frames.

[0010] The L-shaped back plate covers the adjacent two side walls of the composite material box, and the two flat pressure plates cover the other two side walls of the composite material box respectively.

[0011] Multiple square hoop frames are evenly distributed along the length of the composite material box; the adjacent side walls of the square hoop frames serve as fixed sides and are attached to the L-shaped back plate, while the other side walls serve as pressure sides and are spaced apart from the two flat pressure plates.

[0012] Each of the square hoop frames has multiple through threaded holes on both sides of the pressure side, and the flat pressure plate is provided with a pressure rod corresponding to each threaded hole.

[0013] An adjusting nut is rotatably installed inside the threaded hole, and the upper part of the pressure rod enters the inner ring of the adjusting nut, with the upper part of the pressure rod and the inner ring of the adjusting nut being a clearance fit.

[0014] A compression spring is fitted onto the pressure rod; the adjusting nut can adjust the compression of the corresponding compression spring by rotating it in the threaded hole, thereby applying torque to the flat pressure plate.

[0015] This utility model also has the following features:

[0016] Furthermore, each of the square hoop frames has 2-3 through threaded holes on each of its two side walls on the pressure side.

[0017] Furthermore, the top of the adjusting nut is coaxially and fixedly connected with a hexagonal bolt.

[0018] Furthermore, the L-shaped back plate has an L-shaped cross-section, wherein the width of the two sides of the cross-section is the same and smaller than the side length of the cross-section of the composite material square box.

[0019] The width of the planar pressure plate is smaller than the side length of the cross-section of the composite material square box.

[0020] Compared with the prior art, this utility model has the following technical effects:

[0021] This invention's constant-force curing and pressurizing device for composite material square boxes avoids the problem of outward bulging on all four sides of the composite material square box compared to the pressure curing method using wrapped cloth bags, thus improving the quality of the product. Compared to rigid plate pressure curing, this invention can maintain a constant and uniform pressure during the curing of the composite material square box, ensuring stable curing process and curing quality. The overall curing and pressurizing device has a convenient structure, is easy to operate, and provides an effective and feasible solution for the pressure curing of composite material square boxes, making it suitable for large-scale industrial use and promotion. Attached Figure Description

[0022] Figure 1This is a schematic diagram of the overall structure of the composite material square box constant force curing and pressurization device of this utility model;

[0023] Figure 2 This is a partial enlarged view of the composite material square box constant force curing and pressurization device of this utility model;

[0024] Figure 3 This is a schematic diagram showing the connection relationship between the composite material square box and the winding mandrel in this utility model;

[0025] Figure 4 This is a schematic diagram of the L-shaped back plate structure in this utility model;

[0026] Figure 5 This is a schematic diagram of the planar pressure plate structure in this utility model;

[0027] Figure 6 This is a schematic diagram of the square hoop frame structure in this utility model;

[0028] Figure 7 This is a schematic diagram of the adjusting nut structure in this utility model;

[0029] Figure 8 This is a schematic diagram of the pressure bar structure in this utility model.

[0030] The meanings of the labels in the diagram are as follows:

[0031] 1. Winding mandrel; 2. Composite material square box; 3. Square hoop frame; 4. L-shaped back plate; 5. Flat pressure plate; 6. Threaded hole; 7. Pressure rod; 8. Adjusting nut; 9. Compression spring; 10. Hex bolt. Detailed Implementation

[0032] It should be noted that, unless otherwise specified, all components in this utility model are known components in the prior art. For example, the composite material square box is a commonly used composite material square box.

[0033] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0034] like Figure 1-6 As shown, a constant force curing and pressurizing device for composite material square boxes includes a winding core mold 1, on which a composite material square box 2 formed by winding is provided. The device is characterized by further including an L-shaped back plate 4, two flat pressure plates 5 of the same shape, and multiple square hoop frames 3.

[0035] The L-shaped back panel 4 covers the adjacent two side walls of the composite material box 2, and the two flat pressure plates 5 cover the other two side walls of the composite material box 2 respectively.

[0036] Multiple square hoop frames 3 are evenly distributed along the length of the composite material box 2; the adjacent two side walls of the square hoop frames 3 serve as fixed sides and are attached to the L-shaped back plate 4, while the other two side walls serve as pressure sides and are spaced apart from the two flat pressure plates 5.

[0037] Multiple through threaded holes 6 are provided on the two side walls of each square hoop 3 on the pressure side, and pressure rods 7 corresponding to each threaded hole 6 are provided on the flat pressure plate 5.

[0038] An adjusting nut 8 is rotatably installed inside the threaded hole 6. The upper part of the pressure rod 7 enters the inner ring of the adjusting nut 8, and the fit between the upper part of the pressure rod 7 and the inner ring of the adjusting nut 8 is a clearance fit. A compression spring 9 is sleeved on the pressure rod 7. The adjusting nut 8 can adjust the compression of the corresponding compression spring by rotating inside the threaded hole 6, thereby applying torque to the flat pressure plate 5.

[0039] like Figure 8 As shown, the axial section of the pressure bar 7 is convex, and its length is adapted to the distance between the square hoop 3 and the flat pressure plate 5.

[0040] As a preferred option, each square hoop 3 has 2-3 through threaded holes 6 on each of the two side walls of the pressure side.

[0041] The pressurization unit consists of one square hoop 3, two to three adjusting nuts 8, two to three pressure rods, and two to three compression springs 9.

[0042] The square hoop 3 is outside the L-shaped back plate 4 and the two flat pressure plates 5, in contact with the L-shaped back plate 4 and at a certain distance from the two flat pressure plates 5. The square hoop 3 is evenly distributed along the axial direction of the winding mandrel 1. The adjusting nut 8 is connected to the corresponding threaded hole 6 of the square hoop 3 through its own external thread. The compression spring 9 is connected to the pressure rod 7 one by one, and then installed between the square hoop 3 and the flat pressure plate 5 through the center hole of the adjusting nut 8.

[0043] When this device is in use, the pressure is applied by the compression spring 9, which satisfies Hooke's Law F=k*Δx, where F is the spring force, k is the spring constant, and Δx is the spring compression.

[0044] Δx depends on the distance between the contact end of the adjusting nut 8 and the compression spring 9 and the flat pressure plate 5. Therefore, by adjusting the tightness of the adjusting nut 8, the adjusting force F can be achieved. At the same time, the force F and the preload of the adjusting nut 8 satisfy a definite functional relationship, thereby indirectly establishing the relationship between the preload of the adjusting nut 8 and the pressure. Applying the same preload to each pressurizing unit is equivalent to applying the same pressure to the flat pressure plate through each pressurizing unit.

[0045] In addition, during the pressure curing process, the flat platen 5 will be displaced, but the amount of displacement is very small, and the resulting reduction in spring force can be ignored. Therefore, the curing pressure is considered to be constant.

[0046] As a preferred option, the top of the adjusting nut 8 is coaxially and fixedly connected to a hexagonal bolt 10.

[0047] As a preferred embodiment, the L-shaped back plate has an L-shaped cross-section, wherein the width of the two sides is the same and is less than the side length of the cross-section of the composite material square box 2;

[0048] The width of the flat pressure plate 5 is smaller than the side length of the cross-section of the composite material square box 2.

[0049] The following is a specific implementation of this device, including the following steps:

[0050] Step 1: Set the composite material box 2 with the winding mandrel 1 horizontally;

[0051] Step 2: With the notch of the L-shaped back plate 4 facing down, place the L-shaped back plate 4 on the composite material box 2;

[0052] Step 3: Set two flat pressure plates 5 in sequence, and set all the square hoop frames 3 at the corresponding positions of the composite material box 2. Apply torque to the two flat pressure plates 5 according to the actual design torque requirements.

[0053] Step 4: Curing the entire composite material box using the constant force curing and pressurization device until curing is complete.

[0054] During the curing process, the composite resin matrix flows at high temperatures, and the flat pressure plate 5 also moves under the force of the compression spring 9, ensuring that the flat pressure plate 5 remains in contact with the composite box 2 and applies force. Simultaneously, displacement occurs due to this movement, but this displacement is very small, so the compression amount of the compression spring 9 does not change significantly, thus ensuring that the curing pressure of the composite box 2 remains constant. In summary, regardless of how the composite box 2 deforms, the flat pressure plate 5 always applies a constant pressure, ensuring a stable curing process.

[0055] Furthermore, in step 3, applying torque to the flat pressure plate 5 includes the following methods:

[0056] Method 1: Apply torque to the two flat pressure plates 5 in sequence; while applying torque, gradually apply tightening torque to all nuts multiple times until the torque applied to the flat pressure plates 5 reaches the design torque requirement;

[0057] Method 2: Apply torque to the two flat pressure plates 5 in sequence. When applying torque, apply tightening torque to all nuts from both ends to the middle in sequence. Each time tightening torque is applied, ensure that the torque applied to the flat pressure plate 5 reaches the design torque requirement.

[0058] Method 3: Simultaneously apply torque to both flat pressure plates 5. While applying torque, gradually apply tightening torque to all nuts multiple times until the torque applied to the flat pressure plates 5 reaches the design torque requirement.

[0059] Furthermore, in step 3, when applying torque to the flat plate 5, the posture of the flat plate 5 is adjusted to prevent the flat plate 5 from tilting.

Claims

1. A constant-force curing and pressurizing device for a composite material square box, comprising a winding mandrel (1), wherein a composite material square box (2) formed by winding is disposed on the winding mandrel (1), characterized in that, It also includes an L-shaped back plate (4), two flat pressure plates of the same shape (5), and multiple square hoop frames (3); The L-shaped back plate (4) covers the adjacent two side walls of the composite material box (2), and the two flat pressure plates (5) cover the other two side walls of the composite material box (2); Multiple square hoop frames (3) are evenly distributed along the length of the composite material box (2); the adjacent side walls of the square hoop frames (3) are fixed and fit against the L-shaped back plate (4), and the other side walls are pressure-applying and are spaced apart from the two flat pressure plates (5); Each of the square hoop frames (3) has multiple through threaded holes (6) on both sides of the pressure side, and the flat pressure plate (5) is provided with pressure rods (7) corresponding to each threaded hole (6). An adjusting nut (8) is rotatably installed inside the threaded hole (6), and the upper part of the pressure rod (7) enters the inner ring of the adjusting nut (8), and the fit between the upper part of the pressure rod (7) and the inner ring of the adjusting nut (8) is a clearance fit; The pressure rod (7) is fitted with a compression spring (9); the adjusting nut (8) can adjust the pressure of the corresponding compression spring (9) by rotating it in the threaded hole (6), thereby applying torque to the flat pressure plate (5).

2. The composite material square box constant force curing and pressurizing device as described in claim 1, characterized in that, Each of the square hoop frames (3) has 2-3 through threaded holes (6) on each of the two side walls of the pressure side.

3. The composite material square box constant force curing and pressurizing device as described in claim 1, characterized in that, The top of the adjusting nut (8) is coaxial and fixedly connected to a hexagonal bolt (10).

4. The composite material square box constant force curing and pressurizing device as described in claim 1, characterized in that, The L-shaped back plate (4) has an "L" shaped cross section, wherein the width of the two sides of the cross section is the same and is less than the side length of the cross section of the composite material box (2); The width of the flat plate (5) is smaller than the side length of the cross-section of the composite material box (2).

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