Space product cable assembly wire fixing method and space product cable assembly

Abstract

The application provides a space product cable assembly wire fixing method and a space product cable assembly in the field of space product cable assembly manufacturing, and comprises the following steps: S1, hot melt glue is filled between wire bundles below a pressing plate; S2, a heat shrink sleeve is blown and covered; S3, the wire bundles are externally covered with a polyamide filament sleeve; S4, a heat shrink film is wound and blown and covered; and S5, the pressing plate is installed and fixed. The hot melt glue is used to connect the wires together, the relative displacement between the wires is greatly limited, the heat shrink sleeve between the wire bundles and the polyamide filament sleeve is increased, the friction force is increased, in addition, after the coating material is changed into the heat shrink film, the stress on the wire bundles is more uniform, and the wire bundles and the polyamide filament sleeve are less likely to relatively move. In conclusion, the cable reliability can be greatly improved, and the application can be widely applied.

Description

Technical Field

[0001] This invention relates to the field of aerospace product cable assembly manufacturing, specifically to a method for fixing wires in aerospace product cable assemblies and aerospace product cable assemblies. Background Technology

[0002] Traditional aerospace cable assembly manufacturing involves securing the conductors by combing them smoothly and then directly sheathing them with nylon tubing, with the pressure plate filled with PVC strips. This traditional method results in low friction coefficients between conductors and between the conductors and the nylon tubing. Even after the pressure plate is installed, the friction remains low. Furthermore, the uneven deformation of the PVC strip layers under the pressure plate leads to uneven compression of the conductor bundle. In actual operating conditions, under a certain amount of external force, the conductor bundle can slide under the pressure plate. Excessive displacement can cause stress on the solder joints and reduce cable reliability. By limiting the relative movement between conductors and between the conductors and the nylon tubing, external forces are less likely to be transmitted to the connector end cover, ensuring the solder joints are not subjected to external forces, thus significantly improving the reliability of the cable assembly. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the purpose of this invention is to provide a method for fixing wires in aerospace product cable assemblies and aerospace product cable assemblies.

[0004] A method for fixing wires in aerospace product cable assemblies according to the present invention includes the following steps:

[0005] S1. Hot melt adhesive is used to fill the space between the wire bundles under the pressure plate;

[0006] S2. Blow a first sleeve of suitable length containing hot melt adhesive over the outside of the wire bundle;

[0007] S3, the tail cover is filled with heat shrink film.

[0008] Preferably, the first sleeve is a heat shrink tubing.

[0009] Preferably, the material of the heat shrink tubing includes cross-linked polyolefin.

[0010] Preferably, in step S2, the wire bundle is cylindrical.

[0011] Preferably, it includes the following steps:

[0012] S1. Hot melt adhesive is used to fill the space between the wire bundles under the pressure plate;

[0013] S2. Blow a suitable length of heat shrink tubing containing hot melt adhesive over the outside of the wire bundle;

[0014] S3. Pass the wire bundle covered by the first sleeve through the second sleeve;

[0015] S4, rear cover filling material.

[0016] Preferably, in step S3, the second sleeve is made of nylon yarn.

[0017] Preferably, in step S4, the filler material is heat-shrinkable film.

[0018] Preferably, in step S4, the heat-shrink film is wound and blown on.

[0019] Preferably, it includes the following steps:

[0020] S1. Hot melt adhesive is used to fill the space between the wire bundles under the pressure plate;

[0021] S2. Blow a suitable length of heat shrink tubing containing hot melt adhesive over the outside of the wire bundle;

[0022] S3. Thread the wire bundle covered with the first sleeve through a nylon wire sleeve;

[0023] S4. The tail cover is wrapped with heat-shrink film and blown on;

[0024] S5. Install and fix the pressure plate.

[0025] The present invention also provides a cable assembly for aerospace products, and employs a method for fixing the wires of the cable assembly for aerospace products.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention uses hot melt adhesive to connect the conductors together, greatly limiting relative displacement between them. The addition of heat-shrink tubing between the conductor bundle and the nylon sheath increases friction. Furthermore, by changing the covering material to heat-shrink film, the conductor bundle experiences more uniform stress, making relative movement between the conductor bundle and the nylon sheath less likely. In summary, this significantly improves cable reliability and allows for wide application. Attached Figure Description

[0028] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0029] Figure 1 This is a schematic diagram of wire fixing provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the cross-section of the wire harness provided by the present invention. Detailed Implementation

[0031] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0032] Example 1

[0033] According to the present invention, a method for fixing wires in aerospace product cable assemblies is provided, such as... Figure 1-2 As shown, it includes the following steps:

[0034] S1. Hot melt adhesive is used to fill the space between the wire bundles under the pressure plate;

[0035] S2. Blow a heat-shrink tubing of appropriate length containing hot melt adhesive over the wire bundle to make the wire bundle cylindrical.

[0036] S3, the tail cover is filled with heat shrink film.

[0037] Preferably, in step S2, the material of the heat shrink tubing includes cross-linked polyolefin.

[0038] More specifically, in step S1, to limit the mutual displacement between the conductors under external force, and to ensure that the conductor bundle inside the cable bundle center is fully filled with hot melt adhesive, an appropriate amount of hot melt adhesive needs to be filled between the conductor bundles below the pressure plate, based on the conductor bundle diameter. In step S2, since some hot melt adhesive was filled between the conductor bundles in step 1, resulting in an irregular shape, a heat-shrinkable sleeve containing hot melt adhesive is fitted over the conductor bundle and heat-shrinked. During the heat-shrinking process, the internal hot melt adhesive melts, and the conductor bundle forms a regular cylindrical shape. Simultaneously, the friction coefficient between the blown heat-shrinkable sleeve and the outer sheath is much greater than that between the conductor and the outer sheath. Therefore, under the same pressure plate pressure, this method results in greater friction, more stable conductor bundle fixation, and higher reliability. In step S4, the tail cover filling material uses heat-shrinkable film. The heat-shrinkable film adheres tightly to the conductor bundle during the wrapping and heat-shrinking process, resulting in more even stress distribution on the conductor bundle after the pressure plate is installed.

[0039] Example 2

[0040] This second embodiment is based on the first embodiment, such as... Figure 1-2 As shown, it includes the following steps:

[0041] S1. After welding or crimping, the wires should be combed smoothly and have an arc-shaped allowance for stress relief. There should be no bends at the root of the wires. The wires should be parallel and straight and should not cross. Hot melt adhesive should be filled between the wire bundles in the pressure plate installation part. EVA+PA hot melt adhesive can be used, but it is not limited to this.

[0042] S2. Blow a suitable length of heat shrink tubing containing hot melt adhesive over the outside of the wire bundle;

[0043] S3. Thread the wire bundle covered with heat shrink tubing through a nylon filament sleeve.

[0044] S4. The tail cover filling material is filled with heat shrink film. The heat shrink film is wrapped and heat-shrinked at the same time to ensure that all heat shrink film is shrunken into a whole. The heat shrink film should fill the pressure plate hole.

[0045] Example 3

[0046] This embodiment 3 is based on embodiment 2, such as... Figure 1-2 As shown, it includes the following steps:

[0047] S1. After welding or crimping, the wires should be combed smoothly and have an arc-shaped allowance for stress relief. There should be no bends at the root of the wires. The wires should be parallel and straight and should not cross. Hot melt adhesive should be filled between the wire bundles in the pressure plate installation part. EVA+PA hot melt adhesive can be used, but it is not limited to this.

[0048] S2. Blow a suitable length of heat shrink tubing containing hot melt adhesive over the outside of the wire bundle;

[0049] S3. Thread the wire bundle covered with heat shrink tubing through a nylon filament sleeve.

[0050] S4. The tail cover filling material is filled with heat shrink film. The heat shrink film is wrapped and heat-shrinked at the same time to ensure that all the heat shrink film is shrunken into a whole. The heat shrink film should fill the pressure plate hole.

[0051] S5. When installing the pressure plate screws, the two screws should be tightened alternately and gradually to prevent the screw threads from breaking; the spring washer should be flattened and have a certain pre-tightening force, and the heat shrink film filling should have obvious compression deformation.

[0052] More specifically, in the aerospace product cable assembly manufactured by this invention, the entire bundle of wires is fixed into a whole by hot melt adhesive and heat shrink tubing. The wire bundle is pressed and fixed by a pressure plate, which greatly limits the relative displacement between the wire bundles and between the wires and the pressure plate under external force, ensuring that the solder joints or crimped contacts are not subjected to external force and improving the reliability of the cable.

[0053] Example 4

[0054] The present invention also provides a cable assembly for aerospace products, which adopts the wire fixing method for the cable assembly of aerospace products described in any one of Embodiments 1-3.

[0055] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0056] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A method for fixing wires in a cable assembly of aerospace products, characterized in that, Includes the following steps: S1. Hot melt adhesive is used to fill the space between the wire bundles under the pressure plate; S2. A first sleeve containing hot melt adhesive is blown over the outside of the wire bundle. The first sleeve is a heat shrinkable sleeve, and the material of the heat shrinkable sleeve includes cross-linked polyolefin. S3. Pass the wire bundle covered by the first sleeve through the second sleeve, the second sleeve being made of nylon thread; S4. The tail cover is filled with a heat-shrinkable film, wherein the heat-shrinkable film is wrapped and blown on. S5. Install and fix the pressure plate; Hot melt adhesive is used to connect the wires together, restricting relative displacement between them.

2. The method for fixing the conductors of aerospace product cable assemblies according to claim 1, characterized in that, In step S2, the wire bundle is cylindrical.

3. A cable assembly for aerospace products, characterized in that, The method for fixing the conductors of the aerospace product cable assembly as described in any one of claims 1-2 is adopted.

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