CN106739020A - A kind of sample prototype blade bushing - Google Patents

Abstract

The invention discloses a kind of sample prototype blade bushing, including metal body；There is a major thread hole at the center of body, the minor thread location hole for having more than three on end face；Four perisporium outer surfaces are taper, and multi-turn groove is distributed with thereon.The blade made using bushing of the present invention, glass fabric is high with bushing fixation reliability, is difficult delamination, and blade can bear larger centrifugal force；Mould and bushing accurate positioning, do not result in blade biasing in a mold.

Description

A small sample model machine blade bushing

technical field

The invention relates to a small sample model machine blade bushing.

Background technique

At present, most of the fan series products produced in our country use the developed model prototype, and then enlarge or reduce the size according to the principle of geometric similarity to produce fans of various machine numbers. Therefore, each new product needs to make a small sample model machine to verify the performance of the fan. Because the blades are small, the thickness of the glass cloth layer is relatively thin during the production process. It is necessary to ensure light weight, strength, and stiffness. Therefore, it is very important to make a small model machine blade, especially the production of the small model machine blade bushing at the blade root.

The existing bushing is shown in Figure 1, and its tapered outer surface is flat. In order to increase the contact with the glass fiber cloth, the surface must be rough during processing, and sand blasting is required if necessary; at the same time, the When cleaning, the bushing should be thoroughly cleaned. If there is oil, it will cause problems such as weak bonding between the glass cloth and the bushing, and easy delamination. The bonding and fixing of the glass fiber cloth is completely guaranteed by the interference pressure of the mold, so it is necessary to increase the thickness of the glass fiber cloth at this position, which not only wastes materials, but also takes time and effort. The positioning of the blades using this bushing can only be guaranteed by the size and limit of the mold processing. In order to install smoothly, there will be a gap between the mold and the bushing, so there will be inconsistency when the mold and the bushing are placed. ; and during the pressurization process of the mold, it may cause the blade to move up or down, not on the central axis of the blade. This liner can only use the air bag forming process to make blades, and the blade manufacturing method is single. In conclusion, existing bushings are not suitable for use with small model machine blades.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned problems existing in the prior art, to provide a small model machine blade bushing, the blade made by using the bushing, the glass fiber cloth and the bushing are fixed with high reliability, it is not easy to delaminate, and the blade can Withstand large centrifugal force; the mold and bushing are positioned accurately, which will not cause the blade to be biased in the mold.

In order to achieve the above object, the technical solution of the present invention is: a small sample model machine blade bushing, including a metal body; a large threaded hole in the center of the body, and more than three small threaded positioning holes on the end surface; It is conical with multiple circles of grooves distributed on it.

Preferably, there are trapezoidal grooves in the body. Reduced bushing weight.

Preferably, the taper of the surrounding walls is 5°.

Preferably, the multi-circle grooves distributed on the surrounding walls are evenly distributed and are semicircular grooves. Not only the bonding ability of the glass fiber cloth is increased, but also the bonding ability is large and the distribution is balanced, so that the blade can withstand greater centrifugal force and has a long service life.

The end face of the blade bushing of the present invention has four threaded holes, which can be tightly connected with the mold sleeve on the mold through bolts, so as to realize accurate positioning and prevent the blade from being biased in the mold. There is a threaded hole in the middle of the bush, which can not only pour the foam into the inner cavity of the blade smoothly, but also screw on the plug when the foam is solidified, so as to avoid overflow due to expansion when the foam is solidified, and can also discharge the gas generated during solidification. The multi-circle grooves and tapers on the outer surface of the surrounding wall make the first layer of glass fiber cloth and the outer wall of the bushing firmly bonded. When laying the second and third layers of glass fiber cloth, as long as the laid glass Fiber winding on the fiber cloth can achieve good bonding, and can increase the compactness, so that the glass fiber cloth can be firmly fixed layer by layer; there is no need to deliberately increase the thickness; in short, the multi-circle concave on the outer surface of the surrounding wall The existence of grooves and tapers increases the bonding ability with FRP during the blade manufacturing process, so that the blade can withstand greater centrifugal force. Trapezoidal slots inside the vane bushing reduce bushing weight

In a word, the blade made of the bushing of the present invention has high fixing reliability between the glass fiber cloth and the bushing, good adhesion, and is not easy to delaminate, and the blade can withstand relatively large centrifugal force; the mold and the bushing are positioned accurately without causing The offset of the blade in the mold; and the blade can be made by pouring, hand lay-up, air bag and other methods; it is especially suitable for the use of small sample model machine blades.

Description of drawings

Figure 1 is a front view of a conventional bushing.

The front view of the present invention of Fig. 2;

Fig. 3 is the left view of the present invention;

Fig. 4 is a schematic diagram of the assembly structure of the present invention and the mold.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 2 and Figure 3, this embodiment includes a metal body 1; there is a large threaded hole 4 in the center of the body 1, and there are four (three, six, etc.) small threaded positioning holes on the end face 5. The outer surface of the surrounding walls is tapered, preferably with a taper of 5°, and there are multiple circles of grooves 2 distributed thereon, preferably the multiple circles of grooves 2 are evenly distributed and are semicircular grooves. Preferably, there are trapezoidal grooves in the body 1 .

Fig. 4 is a schematic diagram of the assembly structure of the bushing and the mold of the present invention, 6 is a mold, 7 is a bushing of the present invention, and 8 is a glass fiber cloth layer.

The above-mentioned embodiments are only preferred and exemplary, and those skilled in the art can make equivalent technical improvements according to the spirit of this patent, and these are covered by the protection scope of this patent.

Claims (5)

1. A small sample model machine blade bushing is characterized in that: it includes a metal body; there is a large threaded hole in the center of the body, and more than three small threaded positioning holes are arranged on the end face; the outer surface of the surrounding wall is tapered, and the distribution of There are multiple grooves. 2. The blade bushing of the prototype model machine according to claim 1, characterized in that: there is a trapezoidal groove in the said main body. 3. The blade bushing of a prototype model machine according to claim 1 or 2, characterized in that: the taper of the surrounding walls is 5°. 4. The blade bushing of the prototype model machine according to claim 3, characterized in that: the multi-circle grooves distributed on the surrounding walls are evenly distributed and are semicircular grooves. 5. The blade bushing of the prototype model machine according to claim 1 or 2, characterized in that: the multi-circle grooves distributed on the surrounding walls are evenly distributed and are semicircular grooves.