Perforating movable line bundle airtight technology

Abstract

The invention relates to a perforating movable line bundle airtight technology which comprises the following steps: 1. punching a bottom layer 1: (1) adding a casting head at the bottom end of cable aperture which is perforated with leads by using a silicon rubber GD414 rubber tube for bottoming and encapsulating; (2) fixing line bundles at two sides on a side wall of a shell by using paper self-adhesive tapes; and (3) curing at normal temperature for 24h; 2. encapsulating a middle layer 2: (1) uniformly stirring equivalently proper amount of A type adhesive HJ101 and B type adhesive HJ101 in a container; (2) stopping encapsulating in the position having 1-2mm distance to an orifice, and using a heat blower to blow the liquid adhesive; (3) adding proper liquid adhesive to enable an adhesive surface to be flushed with an upper end surface of the perforating hole; (4) after the liquid adhesive does not flow, finishing and clearing; (5) standing and curing at normal temperature for 24h; and (6) clearing adhesive residues and dirt on an external surface in a part encapsulating position; and 3. encapsulating a top layer 3: uniformly covering a layer of 703 silicon rubber on the surface of HJ101 epoxy resin adhesive, and curing at normal temperature. The invention has simple technology and good air tightness, and can not leak air under the condition of high temperature or low temperature.

Description

technical field [0001] The invention relates to an airtight process for a perforated movable wire harness. Background technique [0002] At present, in the photoelectric turntable and optical cabin products, the cables of the photoelectric identification and control devices need to pass through the rotation center hole of the turntable to realize signal transmission. Due to the limitation of product characteristics and space structure, the part area of ​​the cable perforation is very small, the depth of the perforation is less than 10mm, and the number of wires is large. The types of wires include shielded wires and coaxial video cables, and the wire harness follows the movement of the turntable repeatedly. Twist, and at the same time require the airtightness of the harness hole. Using the traditional silicone rubber potting process, because the wiring harness is twisted left and right, the bonding strength between the wire and the glue is low, which makes the sliding betwe...

AI Technical Summary

Problems solved by technology

Using the traditional silicone rubber potting process, because the wire harness is twisted left and right, the bonding strength between the wire and the glue is low, so that the wire and the glue slide and cause air leakage

The use of resin-type adhesive alone, this type of colloid is relatively thick, the number of wires in the wire harness is large, and the space at the potting place is relatively small, making it difficult for the glue to be filled without leaving any gaps between the wires of the wire harness, and The glue sticking on the wire is difficult to clean, making it difficult to shape the wire harness after potting

In addition, the high and low temperature shrinkage rate of resin type glue is relatively large, which is easy to cause air leakage after low temperature cracking

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