Composite single-sided double-thread suture device

Abstract

The invention relates to a single-faced and double-thread composite material sewing device which comprises a thread pulling rod, a rotating shuttle, a thread guiding needle and a thread taking-up needle. When the thread guiding needle and the thread taking-up needle move to reach a lower limit, the thread guiding needle and the thread taking-up needle are intersected, and the thread taking-up needle is inserted into the space between an upper thread and the thread guiding needle through an oblique plane; when the thread guiding needle and the thread taking-up needle move to reach an upper limit, a hook groove takes up an upper thread loop, and a shuttle point reaches the position below the thread taking-up needle to hook the upper thread loop; when the shuttle point drives the upper thread loop to rotate for one circle and lock a bottom thread, the thread guiding needle and the thread taking-up needle firstly move downward and then upward move, the thread pulling rod firstly pays off a thread through forward swing and then pulls the thread through backward swing. The device can conduct single-faced sewing on a fiber laid composite material product provided with a complicated appearance curved surface or a plane having a certain thickness and form locked stitches on the surface, the formed stitches are smooth and free of thread knots, and a structure is stable and reliable.

Description

technical field [0001] The invention relates to a composite material suture device, in particular to a composite material single-side double-thread suture device. Background technique [0002] Composite materials, especially resin-based composite materials, are gradually used in aerospace and navigation due to their advantages of light weight, high performance, strong plasticity, corrosion resistance and fatigue resistance, easy large-scale integral molding, special electromagnetic properties and wave-absorbing stealth. , automobile industry and civil industry and other fields. Resin-based composite materials are mostly laminated structures, and the layers are only bonded by resin, which is prone to invisible damage and cracks to expand into layers after impact, which greatly weakens the overall strength and performance. The introduction of suture technology in the thickness direction of the laminate The introduction of reinforcing fibers can effectively strengthen the inte...

AI Technical Summary

Problems solved by technology

There are not many single-sided suture techniques for composite materials, only the OSS single-sided suture technology with double-needle hooking, using double-needle hooking single-thread to twist and form a chain, the principle is similar to double-thread chain stitching, OSS single-sided suture The suture technology has the following problems: 1) This technology uses a single thread to tangle and restrain itself. This structure is unstable and easy to loosen when pulled, and a chain-shaped knot will be formed on the surface of the workpiece, which is easy to cause stress concentration and is easy to form during curing. The resin is enriched, which reduces the molding quality; 2) This technology must leave a space at the bottom of the part to ensure that the incoming suture can smoothly form a loop and be picked up by the thread take-up needle, which is not applicable to the internal suture of the part

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