RU2317892C1 - Composite connecting element with an integral inner thread - Google Patents

Abstract

FIELD: he invention refers to composite connecting elements with inner thread and may be used in machine building, mining, chemistry and other fields of industry for connecting the elements of constructions.

SUBSTANCE: the connecting element consists of bounded coaxial layers of reinforcing fibrous woven material with elements-formers of the profile of the thread. The material of the indicated layers has surface density increasing layer-by-layer from the inner layer to the external layer. The surface density of the inner layer is no more than 150 g/linear m. The elements-formers of the profile of the thread are fulfilled out of fibrous material in the shape of fibers or plaits uninterrupted along the length of the thread. The indicated elements are located in layers in an alternation order between them. The fibers and the plaits are bounded between themselves and with the indicated layers by a common binding. At that in each layer the fibers or the plaits are placed strictly between the opposite lying lateral sides of the profile of the thread.

EFFECT: increases reliability of the connecting element due to increase of durability on shift at axial loads of its thread.

11 cl, 2 dwg

Description

The invention relates to composite connecting elements with a female thread and can be used in mechanical engineering, electric power, mining, chemical industries, various sectors of the fuel and energy complex and other industries for connecting structural elements.

Composite connectors are attracted by their low weight and inertness to the action of chemicals. However, to date, composite connectors with integral internal threads have not met reliability requirements due to their low shear resistance under axial loads. In addition, the production of such connecting elements was disadvantageous due to the complexity of the thread with its additional profiling in special forms.

Known composite connecting elements with integral internal thread, consisting of coaxially bonded coaxial winding layers of woven fibrous material with forming elements of the thread profile (EP application No. 0373640 A3, IPC ⁵ B29D 1/00, В29С 67/14, В29С 53/58, F16B 35/00, publ. 14.12.89; EP application No. 0373642 A2, IPC ⁵ B29D 1/00, В29С 67/14, В29С 53/58, F16B 33/00, publ. 14.12.89; EP application No. 0449245 A3, IPC ⁵ B29D 1/00, B29C 67/14, B29C 53/58, F16B 33/00, publ. 03/27/91).

Known elements are made of winding layers of knitted or woven reinforcing material formed at the place of manufacture of these elements. They have insufficient shear strength under axial loads, since the role of the elements of the thread profile formers in them is played by the threads of the reinforcing material itself. These threads are intertwined with others and have limited freedom of movement. The result of this is the possibility of thread formation only with rounded tooth tips and flattened corners. Such a thread has insufficient resistance to shear deformation under the action of axial loads. In addition, it contains zones filled only with a binder (without reinforcing material), formed as a result of the successive coincidence of the cells of several layers of woven or knitted material, which also negatively affects the strength.

Element in EP application No. 0373642, paragraph 13 of the claims, is the closest in technical essence and is selected as the closest analogue (prototype).

The technical problem, the disclosure of which the invention is directed, is the development of a reliable and cheap design of a composite connecting element with an internal thread for its mass production.

The technical result that can be obtained by implementing the invention is to increase the reliability of the element by increasing shear strength under axial loads of its thread and reducing the cost of its production.

To solve the problem and achieve a technical result in a composite connecting element with an integral internal thread, consisting of coaxial bonded coaxial layers of a reinforcing fibrous woven material with thread forming elements, according to the invention, said layers are made of said material with a surface density increasing in layers from the inner layer to the outer component for the specified inner layer of not more than 150 g / m.sup., forming elements about Thread threads are made of fibrous material in the form of threads or strands continuous along the length of the thread, placed in layers along the thread height between the layers of said reinforcing woven material, alternating with them, bonded to each other and with said layers by a common binder, with threads or bundles in each their layer is located strictly between the opposite lateral sides of the thread profile.

In particular cases of performing the invention in the claimed element, the total height of the inner layer of the reinforcing fibrous woven material and the subsequent layer of threads or bundles does not exceed half the height of the thread profile; as a reinforcing fibrous woven material, plain, twill or satin weave fabric was used, mainly fabric based on glass, basalt or organic fibers, or combinations thereof; the strength based on the fabric of the layers following the inner layer is more than three times its weft strength; the fabric with its base is oriented along the longitudinal axis of the element; glass, basalt or organic fiber, or a combination thereof, is used as the fibrous material of threads or tows; all layers of the element are made of materials based on the same fiber; layers of threads or tows are made of a material based on a different fiber than layers of a reinforcing woven material; as a binder, a thermoset or thermoplastic binder is used, mainly epoxy, polyester, vinyl ester, polyurethane or a combination thereof; the internal thread is made at its one or both ends; the inner layer is made of at least two elementary layers of a reinforcing fibrous woven material.

Distinctive features of the prototype of the features of the claimed element are the following:

a) the signs that ensure the receipt of a technical result in all cases to which the requested amount of legal protection applies:

- the implementation of the layers of reinforcing fibrous woven material with a layer-by-layer increase from the inner layer to the outer surface density of the material, constituting for the inner layer not more than 150 g / m.sup.,

- the implementation of the elements-formers of the thread profile from fibrous material in the form of continuous threads along the length of the thread or bundles,

- the placement of the aforementioned filaments or bundles in layers along the height of the thread between the layers of the aforementioned reinforcing woven material in alternating order with them

- fastening the above yarns or bundles with each other and with the indicated layers of reinforcing woven material with a common binder,

- the location of the mentioned threads or bundles in each of their layers strictly between the opposite sides of the thread profile;

b) signs characterizing the invention in special cases:

- the total height of the inner layer of the reinforcing fibrous woven material and the subsequent layer of threads or bundles, not exceeding half the height of the thread profile,

- the use as a reinforcing fibrous woven fabric fabric plain, twill or satin weave, mainly fabric based on glass, basalt or organic fibers, or combinations thereof,

- strength based on the fabric of the layers following the inner layer, exceeding its weft strength by more than three times,

- orientation of the fabric with its base along the longitudinal axis of the element,

- the use as a fibrous material of threads or tows of glass, basalt, organic fiber, or a combination thereof,

- the implementation of all layers of the element from materials based on the same fiber,

- the implementation of the layers of filaments or bundles of material based on a different fiber than the layers of reinforcing woven material,

- the use of a binder as a thermoset or thermoplastic binder, mainly epoxy, polyester, vinyl ester, polyurethane or a combination thereof,

- the execution of the internal thread of the element at its one or both ends,

- the implementation of the inner layer of at least two elementary layers of reinforcing fibrous woven material.

These distinctive features, individually and collectively, are aimed at achieving the stated result and are significant. In the prior art, the totality of the known and distinctive features presented in the claims is not known and, therefore, the invention meets the criterion of "novelty."

The claimed element in contrast to the element of the prototype is more reliable due to the higher shear strength of its thread under the action of axial load. This strength of the thread provides, on the one hand, the layered structure of the element at its location, not containing zones filled only with a binder, because dense rows of threads or bundles between layers of woven material exclude the formation of these zones, on the other hand, a clear contour of its thread provided by autonomous threads or bundles placed with a given tension between layers of woven material with fixation of the position of the latter between the opposite lateral sides of the thread profile. A clear contour of the thread of the element provides high quality adhesion to the mating external thread of the element connected to it.

The term "layer" here means the presence of one or more elementary layers in a row from the same material.

Production of the proposed item is cheaper. Unlike the prototype, it is made of finished materials without the cost of their formation and the purchase of equipment for this purpose.

The invention is illustrated by a description of a specific, but not limiting example of implementation and the accompanying drawings, in which Fig. 1 shows the claimed composite connecting element, side view, section, and Fig. 2 is an enlarged sectional view.

Composite connecting element 1 with an internal integral thread 2 consists of layers 3, 4 and 5 of basalt fabric and layers 6 of basalt thread (1, 2).

Layer 3 is internal and is made of basalt fabric with a surface density of 118 g / m.poh. Layers 4 and 5 are made of basalt fabric with successively increasing surface density, whose base strength is 3.5 times that of weft

Each layer 6 is made of basalt threads placed in tight turns between the opposite sides of each other 8 and 9 of the thread profile 2.

All layers 3-5 and 6 are bonded to each other with an epoxy binder 7.

The threads of the layers 6 are the elements-shapers of the profile of thread 2, since they fix the position of layers 3 and 4 of the fabric along the height of thread 2 strictly along its profile, providing a clear contour of thread 2.

Element 1 is made as follows.

On the threaded mandrel wound the inner layer 3 of basalt fabric with a surface density of 118 g / m.poh. Its position is fixed with a layer of 6 turns of basalt thread. Further, before winding up the full height of the thread, the winding of the fabric (with increasing surface density from layer to layer and with the above-mentioned warp and weft strength) and threads are repeated in alternating order. At the end of the thread formation, layers of fabric are wound to form the non-threaded part of the element. The fabric when winding layers 4 and 5 is oriented by its base along the longitudinal axis of the element.

For the production of the element, materials based on any fiber suitable for this purpose are used. Preference is given to glass, basalt and organic fibers. As a binder, a thermoset or thermoplastic binder is used.

The proposed element is used to connect the rod power elements, mainly made of composite materials and having sections with an external thread at their ends.

The claimed element is manufactured in industrial conditions on the equipment for the production of composite products.

Claims (11)

1. A composite connecting element with an integral internal thread, consisting of coaxially bonded coaxial layers of a reinforcing fibrous woven material with thread forming elements, characterized in that said layers are made of said material with a surface density increasing in layers from the inner layer to the outer component for the specified inner layer is not more than 150 g / m linear, the elements-formers of the thread profile are made of fibrous material in the form of continuous other threads of threads or bundles placed in layers along the height of the thread between the layers of said reinforcing woven material in alternating order with them, bonded to each other and with said layers by a common binder, while the threads or bundles in each layer are located strictly between the opposite lateral sides of the thread profile . 2. The element according to claim 1, characterized in that the total height of the inner layer of the reinforcing fibrous woven material and the subsequent layer of threads or bundles does not exceed half the height of the thread profile. 3. The element according to claim 1, characterized in that the fabric of linen, twill or satin weave is used as the reinforcing fibrous woven material, mainly fabric based on glass, basalt or organic fibers, or a combination thereof. 4. The element according to claim 3, characterized in that the strength on the basis of the fabric of the layers following the inner layer is more than three times its strength in the weft. 5. The element according to claim 3, characterized in that the fabric with its base is oriented along its longitudinal axis. 6. The element according to claim 1, characterized in that glass, basalt, organic fiber, or a combination thereof, is used as the fibrous material of the threads or tows. 7. The element according to claim 1, characterized in that all its layers are made of materials based on the same fiber. 8. The element according to claim 1, characterized in that the layers of filaments or bundles are made of a material based on a different fiber than the layers of the reinforcing woven material. 9. The element according to claim 1, characterized in that the binder used is a thermoplastic or thermosetting binder, mainly epoxy, polyester, vinyl ester, polyurethane, or a combination thereof. 10. The element according to claim 1, characterized in that the internal thread is made at its one or both ends. 11. The element according to claim 1, characterized in that the inner layer is made of at least two elementary layers of a reinforcing fibrous woven material.

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