CN112281296A

CN112281296A - Crochet hook for stably implanting Z-direction fibers into composite material preform

Info

Publication number: CN112281296A
Application number: CN202011046808.5A
Authority: CN
Inventors: 单忠德; 郭子桐; 战丽; 李思源; 刘云志; 刘阳; 李军
Original assignee: Beijing Jike Guochuang Lightweight Science Research Institute Co Ltd
Current assignee: Beijing Jike Guochuang Lightweight Science Research Institute Co Ltd; Beijing National Innovation Institute of Lightweight Ltd
Priority date: 2020-09-29
Filing date: 2020-09-29
Publication date: 2021-01-29
Anticipated expiration: 2040-09-29
Also published as: CN112281296B

Abstract

The invention provides a crochet hook for stably implanting Z-direction fibers into a composite material preform, which comprises a Z-direction fiber closing plate, a return spring, a connecting shaft, a magnet and a crochet hook notch, wherein the Z-direction fiber closing plate is connected with a crochet hook rod through the connecting shaft, the closing plate is kept stable by the return spring, the front end of the crochet hook rod is designed into the shape of the notch, the closing plate rotates along a rotating shaft under the pushing force of an array steel needle during working, at the moment, the closing plate can be tilted to a position meeting the requirement of hooking the Z-direction fibers, after the Z-direction fibers are hooked, the closing plate can return to an initial balance position under the action of the return spring, and the magnet is arranged on the crochet hook notch and used for attracting the closing plate to keep the notch in a closed state. In the process of implanting Z-direction fibers into the composite material preform, the device is designed, so that the Z-direction fibers can be effectively protected, the abrasion of the Z-direction fibers and the preform and metal and the offset of the Z-direction fibers are avoided, and the forming quality of the preform is improved.

Description

Crochet hook for stably implanting Z-direction fibers into composite material preform

Technical Field

The invention relates to auxiliary equipment in a three-dimensional weaving process, in particular to a crochet needle which is required for stably hooking yarns in a process of introducing Z-direction fibers into a composite material preform.

Background

The composite material member is widely applied to the fields of aerospace, war industry and the like, so that the requirements on the structure and the performance of the composite material are continuously improved, compared with a two-dimensional structure, the three-dimensional structure composite material member introduces reinforcing fibers in the Z direction, improves the interlayer strength of the composite material in the thickness direction of a three-dimensional fabric, and solves the problems that the composite material member is easy to layer, and the impact toughness and the damage tolerance are low. The woven three-dimensional fabric still has array steel needles formed according to a certain regular shape array in the Z direction, the array steel needles need to be replaced through Z-direction fibers, firstly, the array steel needles are replaced by hook needles, then, the Z-direction fibers on one side of the prefabricated body are hooked and returned to the original position, and finally, the implantation of the Z-direction fibers of the prefabricated body is completed. The traditional device for implanting Z-direction fibers into a composite material preform is easy to cause fiber deviation and friction between the fibers and the preform and between the fibers and a metal crochet needle, so that the efficiency and the quality of Z-direction fiber introduction are reduced, and a new crochet needle is needed to be designed to realize high-quality and high-efficiency implantation of the Z-direction fibers.

Disclosure of Invention

The invention provides the crochet hook for stably implanting Z-direction fibers into the composite material preform, which effectively avoids abrasion and deviation of the Z-direction fibers and improves the quality and efficiency of Z-direction fiber introduction of the preform.

In order to solve the technical problem, the invention provides a crochet hook for stably implanting Z-direction fibers into a composite material prefabricated body, which comprises a Z-direction fiber closing plate, a return spring, a rotating shaft, a magnet, a notch and a crochet hook. The Z-direction fiber closing plate is connected with the crochet hook through a rotating shaft, and the magnet is placed on the notch and used for attracting the closing plate.

The closing plate is a special shape designed according to actual working conditions, the angle between the closing plate and the central shaft is 45 degrees, the angle between the closing plate and the central shaft is 60 degrees, before the closing plate enters the prefabricated body, the front end of the closing plate is contacted with the array steel needle, and the rear end of the closing plate can be tilted to be in a hook needle shape.

The return spring is used for keeping the Z-direction fiber closing plate stable in the front and rear positions under stress, and the matched magnet can ensure that the closing plate and the crochet hook keep a closing state when the closing plate and the crochet hook are not under stress.

The notch comprises a closed plate placed at the front end notch, the closed plate rotates through a rotating shaft, and the tail end notch is used for placing Z-direction fibers when the closed plate is lifted.

The crochet hook is integrally cylindrical, the diameter can reach 1.5mm at least, and friction between the crochet hook and the composite material prefabricated body is reduced.

The invention has the beneficial effects that:

1. introduce the crochet hook before the Z is to the fibre, the closing plate receives array steel needle thrust, through the combined action of return spring and pivot, makes the closing plate rear end perk to the position that satisfies the hook and get Z to the fibre for the crochet hook satisfies the Z and draws the operating condition of prefabricated part to the fibre, improves Z and gets efficiency to the fibre hook.

2. After the Z-direction fiber is hooked, the closing plate is not stressed any more, the closing state of the closing plate and the crochet hook is met under the combined action of the return spring and the magnet, the phenomenon that the Z-direction fiber is rubbed with the composite material prefabricated body and metal and the Z-direction fiber deflects is effectively avoided, the quality of the Z-direction fiber is guaranteed, and the quality of the Z-direction fiber introduction is improved.

Drawings

FIG. 1 shows a front view structural schematic of the present invention;

FIG. 2 shows a schematic perspective view of the present invention;

FIG. 3 illustrates a front end partial schematic view of the present invention;

FIG. 4 shows a schematic view of a hook of the present invention with the hook needle oriented in the Z-direction fibers;

FIG. 5 shows a schematic view of a Z-fiber closure panel of the present invention;

fig. 6 shows a schematic view of the bearded needle notch of the present invention.

In the figure:

1-Z-direction fiber closure panel; 2-a return spring; 3, a rotating shaft;

4-a magnet; 5-notch; 6, hooking a needle;

101-Z direction fiber closing plate front end; 102-rear end of the Z-direction fiber closing plate;

501-front end of crochet hook notch; 502 — rear end of crochet hook notch.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described below with reference to the following embodiments and the accompanying drawings.

Referring to fig. 1, in order to reduce friction between the crochet hook and the composite preform, the crochet hook is designed in a cylindrical shape. Before the crochet hook enters the composite material prefabricated part, the front end of the Z-direction fiber closing plate interacts with the array steel needle, referring to the attached drawing 4, the closing plate rotates under the action of a rotating shaft due to the stress of the front end of the closing plate, after the crochet hook enters the prefabricated part, the rear end of the Z-direction fiber closing plate tilts due to the limitation of the prefabricated part on the tilting displacement of the closing plate, the Z-direction fiber closing plate advances along the crochet hook and cannot scratch the prefabricated part, after the crochet hook jointly comes out of the prefabricated part along with the replaced array steel needle, the Z-direction fiber closing plate completely tilts to the position which meets the position of the crochet hook for hooking the Z-direction fiber, as shown in the attached drawing 3, the array steel needle is withdrawn after the Z-direction fiber is hooked, at the moment, the Z-direction fiber closing plate is not stressed and returns to the original position under the action of a return spring, and the closing plate and the crochet hook are in a closed state due to the attraction effect of, z is to fibre and prefabricated body, and Z can not take place the friction between fibre and the metal to Z, and Z can not take place the skew to the fibre, plays fine guard action to Z to the fibre, after the crochet hook returns initial position, sews up the loop that the crochet hook got, accomplishes the fibrous introduction of first Z, repeats above-mentioned step, accomplishes the fibrous implantation of composite material prefabricated body Z.

Claims

1. A crochet hook for stably implanting Z-direction fibers into a composite material prefabricated body is characterized by comprising a Z-direction fiber closing plate (1), a return spring (2), a rotating shaft (3), a magnet (4), a notch (5) and a crochet hook (6); the Z-direction fiber closing plate (1) is connected with a crochet hook (6) through a rotating shaft (3), and a magnet (4) is placed at the front end (501) of a notch of the crochet hook and used for attracting the Z-direction fiber closing plate (1).

2. The crochet hook for stably implanting Z-direction fibers into a composite material preform according to claim 1, wherein the Z-direction fiber closing plate (1) is in a special shape designed according to actual working conditions, the angle between the front end (101) of the Z-direction fiber closing plate and the rotating shaft (3) is 45 degrees, the angle between the rear end (102) of the Z-direction fiber closing plate and the rotating shaft (3) is 60 degrees, before the Z-direction fiber closing plate enters the preform, the front end (101) of the Z-direction fiber closing plate is in contact with the array steel needle, and the rear end (102) of the Z-direction fiber closing plate can tilt to meet the position for hooking the Z-direction fibers.

3. Bearded needle for the stable implantation of Z-direction fibres in composite preforms according to claim 1, characterised in that said return spring (2) is used to keep the Z-direction fibre closure plate stable in position before and after the application of force, cooperating with the magnet (4) to ensure the closure plate and the bearded needle remain closed with the notch when not under force.

4. Crochet hook for the stable implantation of Z-direction fibres into composite preforms according to claim 1, characterised in that the notch (5) comprises a crochet hook notch front end (501) and a crochet hook notch rear end (502); the front end (501) of the crochet hook notch is used for placing the closing plate (1) to enable the closing plate (1) to rotate through the rotating shaft (3); the crochet notch rear end (502) is used for hooking and placing Z-direction fiber when the closing plate (102) is lifted.

5. The crochet needle for stably implanting Z-direction fibers into a composite material preform according to claim 1, characterized in that the crochet needle (6) is cylindrical as a whole, has a diameter of at least 1.5mm, and reduces friction between the crochet needle and the composite material preform.