A three-way clamping device for the pultrusion process of composite materials

Abstract

The present invention provides a three-way clamping device for a composite material pultrusion process, belonging to the field of clamping devices. It solves the problem that the clamping mechanism of traditional pultrusion equipment can only provide clamping force in the up and down directions, affecting the production efficiency. It includes an outer frame, an upper clamping block, two side clamping blocks and a tensioning block. The two sides of the top of the tensioning block are respectively connected with the side clamping blocks, and the upper clamping block is connected above the two side clamping blocks. The outer frame cooperates with the upper clamping block and the two side clamping blocks to clamp the composite material product. In the case that the equipment only has an up and down clamping force, the present invention can generate a three-way clamping function only through the design of the clamping tooling, ensuring that the two wing plates and the bottom plate of the U-shaped composite material product are clamped simultaneously and the product advances synchronously during the pultrusion process, eliminating the problems of internal stress, insufficient straightness and easy interruption in traditional pultrusion, and greatly improving the product quality and production efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of clamping devices, and particularly relates to a three-way clamping device for the pultrusion process of composite materials. Background Art

[0002] In the pultrusion process, the pultrusion equipment needs to provide a clamping device to clamp the product and continuously pull the product out of the mold cavity through the axial force provided by the equipment to form a continuous linear product (such as a channel shape or other cross-sectional shapes). The clamping mechanism of traditional pultrusion equipment can only provide clamping force in the up and down directions. However, for a thin-walled channel-shaped product with a large cross-section, if only the middle bottom surface is clamped and the two side wings are in a free state, there will be a problem of slightly asynchronous advancement between the wings and the bottom plate that are not fully cured in the mold cavity. As the traction process continues, the straightness of the product will exceed the standard, and the internal stress and mechanical properties of the product will also decline. In severe cases, wing defects will occur until the product is broken and the production is interrupted. Summary of the Invention

[0003] In view of this, the present invention aims to provide a three-way clamping device for the pultrusion process of composite materials to solve the problem that the clamping mechanism of traditional pultrusion equipment can only provide clamping force in the up and down directions. However, for a thin-walled channel-shaped product with a large cross-section, if only the middle bottom surface is clamped and the two side wings are in a free state, there will be a slightly asynchronous advancement between the wings and the bottom plate that are not fully cured in the mold cavity, and the production efficiency will be affected.

[0004] To achieve the above object, the present invention adopts the following technical solutions: A three-way clamping device for the pultrusion process of composite materials includes an outer frame, an upper clamping block, two side clamping blocks, and a tensioning block. The two sides of the top of the tensioning block are respectively connected to the side clamping blocks, and the upper clamping block is connected above the two side clamping blocks. The outer frame cooperates with the upper clamping block and the two side clamping blocks to clamp the composite material product.

[0005] Furthermore, the composite material product is a frame surrounded by three sides, which can be a right-angle frame, a trapezoidal frame, or a special-shaped frame, that is, the corners of the frame can be right angles, obtuse angles, or acute angles, and can be symmetric or asymmetric.

[0006] Furthermore, the outer frame fits the shape of the composite material product and wraps the composite material product on the outside.

[0007] Furthermore, the outer frame cooperates with the upper clamping block and the two side clamping blocks to clamp the composite material product.

[0008] Furthermore, a push rod is connected below the tensioning block.

[0009] Furthermore, the three-way clamping device for the composite material pultrusion process further includes two helical compression springs. The bottom of each tensioning block is connected to the tensioning block through a helical compression spring, and the helical compression spring is used to ensure that the tensioning block is in an outward expansion state.

[0010] Furthermore, the longitudinal section of the side clamping block is a right trapezoid structure, with the short side at the bottom, the long side at the top, the right-angled waist connected to the tensioning block, and the top side connected to the upper clamping block.

[0011] Furthermore, slideways are arranged on both sides of the tensioning block, and protrusions are arranged on the side connection part of the side clamping block. The side clamping block can move along the slideways of the tensioning block.

[0012] Furthermore, slideways are arranged on both sides of the upper clamping block, and protrusions are arranged on the top connection part of the side clamping block. The side clamping block can move along the slideways of the upper clamping block.

[0013] Furthermore, the outer frame is connected to the upper frame through an outer frame fixing structure, and the upper frame is U-shaped.

[0014] Compared with the prior art, the beneficial effects of the three-way clamping device for the composite material pultrusion process of the present invention are as follows:

[0015] (1) In the case where the equipment only has an up-and-down clamping force, the present invention can generate a three-way clamping function only through the design of the clamping tooling, ensuring that the two side wings and the bottom plate of the U-shaped composite material product are clamped simultaneously and the product moves forward synchronously during the pultrusion process, eliminating the problems of internal stress, insufficient straightness, and easy interruption in traditional pultrusion, and greatly improving the product quality and production efficiency.

[0016] (2) The present invention is not only applicable to U-shaped composite material products but also applicable to other three-sided special-shaped frames. In this way, the three-way clamping device does not have overly strict requirements for the accuracy of the clamping gap. When a certain clamping surface comes into contact first, the clamping force will move in the direction where it has not yet come into contact until all clamping surfaces are in contact, and then the clamping force will increase comprehensively to clamp the product and move it forward. The present invention can obtain a three-way clamping function with only one clamping tooling, and these three directions can be changed according to the cross-sectional shape of the product and are not necessarily perpendicular to each other, making the applicable products more extensive and the application more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 It is a schematic diagram of a clamping structure using a push rod to clamp on both sides in the prior art;

[0019] Figure 2 This is a schematic structural view of the three-way clamping device for the composite material pultrusion process according to the present invention;

[0020] Figure 3 This is a schematic structural view of the cooperation between the three-way clamping device for the composite material pultrusion process according to the present invention and the upper frame of the reciprocating traction device;

[0021] Figure 4 This is a schematic view of the mechanism of the entire composite material pultrusion device, and the present invention is applicable to the reciprocating traction device;

[0022] Figure 5 This is the front view of the tensioning block;

[0023] Figure 6 This is the side view of the tensioning block;

[0024] Figure 7 This is a schematic structural view of the composite material product being a trapezoidal frame;

[0025] In the figure: 1 - outer frame, 2 - composite material product, 3 - upper clamping block, 4 - side clamping block, 5 - helical compression spring, 6 - tensioning block, 7 - upper frame, 8 - outer frame fixing structure, 9 - ejector rod. Specific embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] I. Specific embodiment 1, see Figure 2-7 Describe this embodiment. A three-way clamping device for the composite material pultrusion process includes an outer frame 1, an upper clamping block 3, two side clamping blocks 4, and a tensioning block 6. The two sides of the top of the tensioning block 6 are respectively connected to the side clamping blocks 4, and the upper clamping block 3 is connected above the two side clamping blocks 4. The outer frame 1 is U-shaped, and the outer frame 1 cooperates with the upper clamping block 3 and the two side clamping blocks 4 to clamp the composite material product 2.

[0028] The composite material product 2 is a frame surrounded by three sides, which can be a right-angle frame, a trapezoidal frame, or a special-shaped frame. That is, the corners of the frame can be right angles ( Figure 2 - Figure 3 ), obtuse angles ( Figure 7 ), or acute angles, and can be symmetric or asymmetric. The outer frame 1 fits the shape of the composite material product 2 and wraps the composite material product 2 on the outside.

[0029] The present invention is applicable not only to U-shaped composite products but also to other three-sided special-shaped frames. In this way, the three-way clamping device does not have overly stringent requirements for the accuracy of the clamping gap. When a certain clamping surface makes contact first, the clamping force will move towards the direction that has not yet made contact until all clamping surfaces are in contact, and then the clamping force will increase comprehensively to clamp the product and move it forward. The present invention can obtain a three-way clamping function with only one clamping tooling, and these three directions can be changed according to the cross-sectional shape of the product and are not necessarily perpendicular to each other, making the applicable products more extensive and the application more flexible.

[0030] The three-way clamping device for the composite material pultrusion process further includes two helical compression springs 5. The bottom of each tensioning block 6 is connected to the tensioning block 6 through a helical compression spring 5. The helical compression spring 5 is used to ensure that the tensioning block 6 is in an outwardly expanded state, and at the same time, when it is in a non-clamping state, it ensures that the side clamping block 4 does not contact the composite material product 2.

[0031] The longitudinal section of the side clamping block 4 is a right trapezoidal structure, with the short side at the bottom, the long side at the top, the right-angled waist connected to the tensioning block 6, and the top side connected to the upper clamping block 3.

[0032] Sliding grooves are provided on both sides of the tensioning block 6, and protrusions are provided on the side connection part of the side clamping block 4. The side clamping block 4 can move along the sliding grooves of the tensioning block 6.

[0033] Sliding grooves are provided on both sides of the upper clamping block 3, and protrusions are provided on the top connection part of the side clamping block 4. The side clamping block 4 can move along the sliding grooves of the upper clamping block 3.

[0034] The outer frame 1 is connected to the upper frame 7 through an outer frame fixing structure 8, and the upper frame 7 is U-shaped. A top rod 9 is connected below the tensioning block 6.

[0035] As Figure 4 shown is a schematic diagram of the mechanism of the entire composite material pultrusion device. The three-way clamping device described in the present invention is applicable to the reciprocating traction device. The reciprocating traction device works alternately to traction the composite material product 2, and the composite material product 2 is mainly a high molecular resin material. The two-way clamping method in the prior art ( Figure 1 shown) is very likely to cause traction deformation of the composite material product 2.

[0036] In the case where the equipment only has an up-and-down clamping force, the present invention can generate a three-way clamping function only through the design of the clamping tooling, ensuring that the two side wings and the bottom plate of the U-shaped composite material product are clamped simultaneously and the product moves forward synchronously during the pultrusion process, eliminating the problems of internal stress, insufficient straightness, and easy interruption in traditional pultrusion, and greatly improving the product quality and production efficiency.

[0037] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. According to the content of this specification, many modifications and variations can be made. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention.

Claims

1. A three-way clamping device for a composite material pultrusion process, characterized in that: It includes an outer frame (1), an upper clamping block (3), two side clamping blocks (4) and a tensioning block (6). The two sides of the top of the tensioning block (6) are respectively connected to the side clamping blocks (4), and the upper clamping block (3) is connected above the two side clamping blocks (4). The outer frame (1) cooperates with the upper clamping block (3) and the two side clamping blocks (4) to clamp the composite material product (2); The composite material product (2) is a frame surrounded by three sides, which can be a right-angle frame, a trapezoidal frame or a special-shaped frame; The outer frame (1) fits the shape of the composite material product (2) and wraps the composite material product (2) on the outside; The three-way clamping device for the composite material pultrusion process further includes two spiral compression springs (5). The bottom of each tensioning block (6) is connected to the tensioning block (6) through a spiral compression spring (5), and the spiral compression spring (5) is used to ensure that the tensioning block (6) is in an outward expansion state; The longitudinal section of the side clamping block (4) is a right trapezoidal structure, with the short side at the bottom, the long side at the top, the right-angled waist connected to the tensioning block (6), and the top side connected to the upper clamping block (3).

2. The three-way clamping device for the composite material pultrusion process according to claim 1, characterized in that: Sliding grooves are provided on both sides of the tensioning block (6), and protrusions are provided on the side connection parts of the side clamping blocks (4), and the side clamping blocks (4) can move along the sliding grooves of the tensioning block (6).

3. The three-way clamping device for the composite material pultrusion process according to claim 2, characterized in that: Sliding grooves are provided on both sides of the upper clamping block (3), and protrusions are provided on the top connection parts of the side clamping blocks (4), and the side clamping blocks (4) can move along the sliding grooves of the upper clamping block (3).

4. The three-way clamping device for the composite material pultrusion process according to claim 1, characterized in that: The outer frame (1) is connected to the upper frame (7) through an outer frame fixing structure (8).

5. The three-way clamping device for the composite material pultrusion process according to claim 4, characterized in that: The upper frame (7) is U-shaped.

6. The three-way clamping device for the composite material pultrusion process according to claim 1, characterized in that: A push rod (9) is connected below the tensioning block (6).

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