Stitched structure for end parts of parachute strap adjusting bands and making method thereof

Abstract

The invention discloses a stitched structure for end parts of parachute strap adjusting bands and a making method thereof. The stitched structure comprises adjusting bands (1) and reinforcing fabrics (2), wherein the adjusting bands (1) are folded in order that the end parts of the adjusting bands (1) are covered with other parts of the adjusting bands (1), thereby forming a rectangular folding area; the reinforcing fabrics (2) are arranged between two layers of adjusting bands in the folding area; after two triangles are removed from the folding area by cutting, a polygon is formed; the folding area is stitched along the edges of the polygon through stitches (3); the corner cutting edges are provided with saw-tooth stitches (3) for reinforcing and fixing; two sides formed after removal of the triangles from the folding area are subjected to fusion treatment. The stitched structure has high stability, the service lives of the adjusting bands can be prolonged greatly, and the use safety can be enhanced greatly.

Description

technical field [0001] The invention belongs to the field of parachute technology, and more specifically relates to a sewing structure at the end of a parachute strap adjustment belt and a manufacturing method thereof. Background technique [0002] The harness is an essential system component in a human parachute, such as the paratrooper parachute used by the aviation army, the lifesaving parachute used by fighter pilots, and various civilian sports parachutes, such as paragliders, parafoils, and powered parachutes. The strap is the connecting part between the parachute and the skydiver, and it is also the force-bearing part that transmits the load. As an essential equipment for human umbrellas, the straps mainly have the following requirements for material selection: (1) The force distribution is reasonable and uniform, the structure is simple, and the weight is light; (2) Safe and reliable, with sufficient strength; (3) It is reusable and easy to wear and adjust. [0003...

AI Technical Summary

Problems solved by technology

However, recently, it was found that potential problems in this method often appeared during the field use of the product, which had a certain impact on the service life of the entire strap. So far, no corresponding solutions or effective solutions have been formed.

[0006] Analyze the material selection and structure of the strap adjustment belt of this model: (1) what the existing adjustment belt head adopts is a thick type high-strength polyester ribbon material, but because the thickness of the material is large, the material fiber bundle is thicker, polyester or brocade The fiber surface of the silk material is smooth. After cutting the corner, cut off both ends of the weft fiber at the corner, and cut off the end of the warp fiber bundle, so that neither the warp fiber bundle nor the weft fiber bundle at the head can be effectively fixed. Although thermoelectric fusion solidification has been carried out, the fiber material is very brittle after solidification and is not easy to bend. After repeated use, the sintered material falls off, and the leading part is fluffed and deformed; (2) The thickness and strength of the material are relatively large, so high-strength Coarse sutures; (3) According to the standard, based on the selection of the material of the adjustment belt and the suture, the stitch size is required to be about 15 stitches when sewing on a single-needle machine, which is smaller than that of ordinary thin threads, and the number of fixed points is reduced

[0007] The inherent existence of the above three points, the fiber at the end of the adjustment belt and the single row of sutures are in an unstable state, all of which lead to the easy deformation of the cutting corner of the existing strap adjustment belt, poor adhesion and fixation of the material fibers and sutures, and the cutting edge melting The knot is very brittle, and it is easy to fall off after several times of use. After falling off, the single row of sutures and material fiber bundles will lose their fixation and be in a free state. The sutures and material fibers will loosen and come out, which will affect the strap. Seriously, it will lead to the failure of the belt head. Due to the non-removable and repairable nature of the adjustment belt, the defects in the structural design of the existing strap adjustment belt will eventually lead to the failure and scrapping of the strap within the entire life of the strap, reducing the use of the strap Life expectancy, in severe cases, it will affect the pilot's confidence or flight safety

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