CN109624356B

CN109624356B - Winding method of small-angle fiber winding pipe

Info

Publication number: CN109624356B
Application number: CN201811543338.6A
Authority: CN
Inventors: 马斌; 刘超凡; 高俊; 於仁明
Original assignee: Jiangsu Shenma Electric Power Co Ltd
Current assignee: Jiangsu Shenma Electric Power Co Ltd
Priority date: 2018-12-17
Filing date: 2018-12-17
Publication date: 2021-06-29
Anticipated expiration: 2038-12-17
Also published as: CN109624356A

Abstract

The invention relates to a winding method of a small-angle fiber winding pipe, which comprises forward winding, stay winding and reverse winding, wherein the stay winding comprises the following steps: the winding carriage remains stationary and the mandrel continues to rotate for a predetermined dwell angle β to allow the fiber to continue to wind at the wind termination point. Before the forward winding is switched to the reverse winding, the stay winding is added, namely, the winding trolley keeps still, the core mould continues to rotate by the preset stay angle beta, so that the fibers are continuously wound at the winding end point, and the yarn slipping phenomenon of the fibers can be prevented without using a yarn hanging system.

Description

Winding method of small-angle fiber winding pipe

Technical Field

The invention relates to the technical field of power transmission insulation, in particular to a winding method of a small-angle fiber winding pipe.

Background

The fiber winding pipe is widely applied to the fields of composite insulators, insulating pull rods, composite electric poles, oil pipelines and the like. The fiber winding can be designed according to the mechanical property of the product. Among them, the fiber winding pipe used in the insulation rod, the composite insulator, and the composite pole is generally wound at an angle of 30 ° or less in the design of the layer because it has high requirements for the axial bending strength and the axial tensile strength.

At present, for a fiber winding pipe with a small angle (the winding angle alpha is 25-40 degrees), in order to avoid loosening and slipping of fibers at two ends in the winding process, yarn hanging systems need to be additionally arranged at two ends of a core mold, however, the use of the yarn hanging systems can increase the allowance of cutting off two ends of a blank pipeline, and material waste is increased.

Disclosure of Invention

Based on this, it is necessary to provide a winding method for a small-angle filament winding tube, aiming at the problem that the use of a yarn hanging system in the small-angle filament winding tube causes material waste.

A method of winding a small angle filament wound tube comprising the steps of:

forward winding: the method comprises the following steps that a winding trolley moves forwards from a rest position along the axial direction of a mandrel rotating in the circumferential direction, so that fibers are wound on the mandrel at a winding angle alpha of 25-40 degrees from a winding starting point to a winding end point, wherein the mandrel is divided into a first winding section, a second winding section and a third winding section from the winding starting point to the winding end point, the winding trolley advances at an accelerated speed in the first winding section, the winding trolley advances at a uniform speed in the second winding section, and the winding trolley advances at a decelerated speed in the third winding section and decelerates to zero when the fibers are wound to the winding end point;

and (3) staying and winding: the winding trolley keeps still, the core mould continues to rotate by a preset stay angle beta, so that the fibers are continuously wound at the winding end point; and

and (3) reverse winding: and the winding trolley moves reversely from a static state, the core mould keeps rotating, so that the fiber is wound on the core mould from a winding end point to a winding start point at a winding angle gamma of 25-40 degrees, wherein the winding trolley advances at a high speed in a third winding section, the winding trolley advances at a constant speed in a second winding section, and the winding trolley advances at a low speed in the first winding section and decelerates to zero when the fiber is wound to the winding start point.

According to the winding method of the small-angle fiber winding pipe, before the forward winding is switched to the reverse winding, the stay winding is added, namely the winding trolley keeps still, the core mold continues to rotate by the preset stay angle beta, so that the fibers are continuously wound at the winding end point, and the yarn slipping phenomenon of the fibers can be prevented without using a yarn hanging system.

In one embodiment, before the forward winding is started, the method further comprises the following steps: the winding trolley is still, and the core mould rotates in the circumferential direction, so that the fibers are wound for more than 2 circles at the winding starting point.

In one embodiment, the length of the first winding section and the length of the third winding section are equal.

In one embodiment, the winding angle α in the forward winding is equal to the winding angle γ in the reverse winding.

In one embodiment, the mandrel has a diameter D ≦ 200 mm.

In one embodiment, the dwell angle β is 30 ° to 80 °.

In one embodiment, the length of the first winding section and/or the third winding section is 300-700 mm.

In one embodiment, the forward winding, dwell winding and reverse winding cycles are performed more than 2 times.

In one embodiment, the fiber is wound at the winding start for more than 2 turns in more than 2 cycles before the first cycle begins; after the last circulation is finished, directly finishing winding or winding the fiber at the winding starting point for more than 2 circles; in each intermediate cycle, the winding carriages are respectively stopped at the winding start point and the winding end point and the core molds are respectively rotated by the stopping angle beta.

In one embodiment, the fibers are fiberglass, aramid, carbon, or polyester fibers impregnated with a resin that is an epoxy, unsaturated, vinyl, or polyurethane resin.

Drawings

FIG. 1 is a schematic perspective view of wound fibers on a mandrel according to one embodiment of the present invention;

fig. 2 is a schematic plan view of wound fibers on a mandrel in accordance with one embodiment of the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention provides a winding method of a small-angle fiber winding pipe. This small-angle fiber twines pipe can be applied to fields such as composite insulator, insulating pull rod, compound pole, oil pipeline, for example the fiber twines the pipe and can be used to make composite insulator: the umbrella skirt is arranged outside the fiber winding pipe, and the flanges and other elements are arranged at the two ends of the fiber winding pipe.

Referring to fig. 1 and 2, a winding method of a small angle filament winding tube according to an embodiment of the present invention is illustrated to show a winding effect when winding a filament 20 on a core mold 10. In the present embodiment, "angle" among small angles refers to the winding angle α of the fiber 20. As shown in fig. 2, the winding angle α refers to the angle between the length direction of the fiber 20 and the axis of the mandrel 10. The small angle range is 25-40 degrees. The type of the fiber 20 is not limited, and may be, for example, glass fiber, aramid fiber, carbon fiber or polyester fiber impregnated with resin, wherein the resin may be epoxy resin, unsaturated resin, vinyl resin or polyurethane resin, but may be other resins commonly used in the industry.

The winding method of the small-angle filament winding tube according to the embodiment of the present invention is described in detail below with reference to fig. 1 and 2. The winding method of the small-angle fiber winding pipe according to one embodiment of the invention comprises the following steps.

S100, forward winding, wherein a winding trolley moves forward from a rest position along the axial direction of a mandrel rotating in the circumferential direction, so that fibers are wound on the mandrel at a winding angle alpha of 25-40 degrees from a winding starting point to a winding end point, the mandrel is divided into a first winding section, a second winding section and a third winding section from the winding starting point to the winding end point, the winding trolley advances in the first winding section at an accelerated speed, the winding trolley advances in the second winding section at a constant speed, and the winding trolley advances in the third winding section at a decelerated speed and reaches zero when the fibers are wound to the winding end point.

As shown in fig. 1, the winding from the left end to the right end of the core mold 1 is defined as a forward winding, and vice versa as a reverse winding. In the forward winding process, the core mold 10 is kept rotated about its axis, and the winding carriage on which the fibers 20 for winding are mounted is moved from the left end of the core mold 10 from the stationary position toward the right end of the core mold 10, that is, moved forward, so that the fibers 20 are spirally wound on the surface of the core mold 10. The winding angle α is set in the range of 25 ° to 40 °. As shown in fig. 2, the winding angle at the time of reverse winding is an angle between the longitudinal direction of the fiber 20 and the axis of the mandrel 10, and is represented by γ.

Specifically, the core mold 10 has a winding start point 110 at the left end and a winding end point 120 at the right end. The core mold 10 is divided into a first winding section a, a second winding section b, and a third winding section c from the winding start point 110 to the winding end point 120. The winding trolley advances in the first winding section a at an accelerated speed so as to drive the fibers 20 to advance at an accelerated speed; the winding trolley advances at a constant speed in the second winding section b to drive the fibers 20 to also advance at a constant speed; the winding carriage is decelerated to zero in the third winding section c and is decelerated to zero when the fibre 20 is wound to the winding end 120 in preparation for the reverse movement, in which phase the fibre 20 is also decelerated to zero.

S200, stopping and winding: the winding carriage remains stationary and the mandrel continues to rotate for a predetermined dwell angle β to allow the fiber to continue to wind at the wind termination point.

When the fiber 20 is wound to the winding end 120, the winding carriage is immobilized, but the mandrel 10 continues to rotate by a predetermined angle, defined as the dwell angle β. During the dwell winding, the winding angle α of the fiber 20 is switched to 90 °. Because the winding trolley stays in place, the fibers 20 continue to be wound at the winding end point 120 by the stay angle beta, so that the yarn slipping phenomenon at the winding end point 120 can be avoided without using a yarn hanging system, the winding end point 120 can be close to the right end of the core mold 10 as much as possible, the length allowance of the right end of the small-angle fiber winding pipe is reduced, and the material waste is reduced; meanwhile, the cost of the small-angle fiber winding pipe is further reduced due to the fact that a yarn hanging system is not used.

S300, reverse winding: and the winding trolley moves reversely from a static state, the core mould keeps rotating, so that the fiber is wound on the core mould from a winding end point to a winding start point at a winding angle gamma of 25-40 degrees, wherein the winding trolley advances at a high speed in a third winding section, the winding trolley advances at a constant speed in a second winding section, and the winding trolley advances at a low speed in the first winding section and decelerates to zero when the fiber is wound to the winding start point.

After the winding is finished, the core mold 10 is still rotated, and the winding carriage starts to move reversely, so that the fiber 20 is spirally wound at the winding angle γ of 25 ° to 40 ° from the winding end point 120 to the winding start point 110. This is a single layer of winding but is not sufficient to wind a single layer of fibre, and normally the fibre 20 is required to be wound 4-10 times to fill the core 10 a layer and then to enter a second layer of winding until the required winding thickness is reached.

In the winding method of the small-angle fiber winding pipe, before the forward winding is switched to the reverse winding, the stay winding is added, namely, the winding trolley keeps still, the core mold 10 continues to rotate by the preset stay angle beta, so that the fibers are continuously wound at the winding end point 120, and the yarn slipping phenomenon of the fibers can be prevented without using a yarn hanging system.

According to some embodiments of the invention, before the forward winding starts, further comprising the steps of: the winding trolley is still, and the core mould rotates in the circumferential direction, so that the fibers are wound for more than 2 circles at the winding starting point.

Specifically, before the forward winding is started, after the core mold 10 starts to rotate, the winding carriage is kept stationary to wind the fibers 20 at the winding start point 110 for 2 or more turns, and then the winding carriage starts to move in the axial direction of the core mold 10 to start the forward winding. Thus, the phenomenon of yarn slipping at the left end of the core mould 10 can be avoided without using a yarn hanging system, so that the winding starting point 110 can be as close as possible to the left end of the core mould 10, the length allowance of the left end of the small-angle fiber winding pipe is reduced, and the material waste is reduced; meanwhile, the cost of the small-angle fiber tube is further reduced due to the fact that a yarn hanging system is not used.

Preferably, the fiber 20 is wound at the winding start point 110 for 4 to 8 turns, so that the fiber 20 is firmly wound at the winding start point 110.

According to some embodiments of the invention, the length of the first winding section and the length of the third winding section are equal. Specifically, when winding in the forward direction, the first winding section a is an acceleration section of the winding trolley, the third winding section c is a deceleration section of the winding trolley, and when winding in the reverse direction, the reverse direction is just opposite. Therefore, the length of the first winding section a and the length of the third winding section c are preferably set to be consistent, so that the speed change rule of the winding trolley in forward movement is consistent with the speed change rule of the winding trolley in reverse movement, and materials can be saved as far as possible under the condition that the product performance of the small-angle fiber pipe is guaranteed.

According to some embodiments of the invention, the winding angle α in the forward winding is equal to the winding angle γ in the reverse winding. For example, the winding angle α in the forward winding is set to 30 °, and the winding angle γ in the reverse winding is set to 30 °, so as to ensure stable product performance of the small-angle fiber tube. Of course, the present invention is not limited thereto, and in other embodiments, the winding angle in the forward winding and the winding angle in the reverse winding may not be equal.

According to some embodiments of the invention, the mandrel has a diameter D ≦ 200 mm. Through tests, the winding method provided by the embodiment of the invention is particularly suitable for the core die with the diameter D of less than or equal to 200 mm, and the probability of yarn slipping is extremely low.

According to some embodiments of the invention, the dwell angle β is 30 ° to 80 °. Through tests, when the core mold 10 continuously rotates at the staying angle beta of 30-80 degrees during staying and winding, the anti-slip yarn effect after the fiber 20 is continuously wound at the right end of the core mold 10 is the best.

According to some embodiments of the invention, the first winding section and/or the third winding section has a length of 300 mm to 700 mm. During forward winding, the first winding section a is an accelerating section of the winding trolley, the winding trolley needs to accelerate to a set speed and ensures that the yarn slipping phenomenon does not occur when the fibers 20 are wound on the core mould 10, and through tests, the length range of the first winding section a is more appropriate when being 300-700 millimeters, so that the yarn slipping phenomenon can be effectively avoided when the winding trolley advances in an accelerating manner. The third winding section c is a deceleration section of the winding trolley, the speed of the winding trolley needs to be reduced to zero, and the phenomenon of yarn slipping does not occur when the fiber 20 is wound on the core mould 10, and through tests, the length range of the third winding section c is proper when the length range is 300-700 mm, so that the phenomenon of yarn slipping can be effectively avoided when the winding trolley advances in an accelerating manner. When the yarn is reversely wound, the speed change condition of the winding trolley is just opposite to that of the forward winding, and the yarn slipping phenomenon can be just avoided within the length range.

According to some embodiments of the invention, the forward winding, dwell winding and reverse winding cycles are performed more than 2 times.

Specifically, one forward winding, one dwell winding, and one reverse winding are defined as one cycle, which may be performed more than 2 times. For example, the cycle is performed 2 times, where the complete winding process is at least as follows: forward winding, stay winding, reverse winding, and so on. Thus, a desired thickness of the filament winding layer can be formed on the surface of the core mold 10 through a plurality of cycles.

Further, in 2 or more cycles, before the first cycle is started, the fiber is wound at the winding start point for 2 or more turns; after the last circulation is finished, winding the fiber at the winding starting point for more than 2 circles; in each intermediate cycle, the winding carriages are respectively stopped at the winding start point and the winding end point and the core molds are respectively rotated by a stopping angle beta.

Specifically, in 3 cycles as an example, before the first cycle starts, the fibers are wound at the winding start point for 2 or more turns, that is, before the forward winding of the first cycle starts, the core mold 10 is rotated, and then the winding carriage is kept stationary to wind the fibers 20 at the winding start point 110 for 2 or more turns, preferably 4 to 8 turns, and then the winding carriage starts to move in the axial direction of the core mold 10 to start the forward winding. In this way, the fiber 20 is wound at the winding start point 110 by a plurality of turns, so that the slipping phenomenon at the left end of the core mold 10 can be prevented without using a yarn hanging system.

The second cycle is an intermediate cycle. The forward winding of the second cycle is engaged with the reverse winding of the first cycle so that the winding car is stopped at the winding start and the mandrel is rotated by a stop angle β before the second cycle. In other words, it can be understood that the dwell wrap is increased between the reverse wrap of the first cycle and the forward wrap of the second cycle. After the forward winding of the second cycle is finished and before the reverse winding of the second cycle is carried out, the winding trolley stops at the winding end point and the core mould rotates by a stopping angle beta, namely, the stopping winding of the second cycle is carried out. The reverse winding of the second cycle is linked to the forward winding of the third cycle, and after the second cycle is finished, the winding trolley returns to the left end of the core mold 10, and the winding trolley stays at the winding start point 110 and the core mold rotates by a stay angle β. Thus, in multiple cycles, the stay winding is provided between two adjacent cycles, so that the fiber 20 is wound at the stay angle β every time the intermediate cycle passes through the winding start point 110, and the yarn slipping phenomenon is avoided.

The third circulation is the last circulation, and the forward winding, the stay winding and the reverse winding are sequentially carried out. After the third cycle is complete, the winding carriage returns to the left end of the mandrel 10 and the fibers 20 return to the winding start 110 on the mandrel 10. The winding carriage is stopped but the core mold 10 is continuously rotated so that the fiber 20 is wound at the winding start point 110 for more than 2 turns, preferably 4 to 8 turns, thereby preventing the slipping phenomenon. In other embodiments, after the third cycle is completed, the step of winding the fiber 20 at the winding start point 110 for 2 or more turns may not be performed, that is, the winding may be directly completed after the third cycle is completed.

By the measures, the fiber 20 is wound by the winding stopping angle beta every time the fiber passes through the winding starting point 110 and the winding ending point 20, so that the yarn slipping phenomenon is effectively avoided. The passing through the winding start point 110 includes the first time when the loop is ready to start from the winding start point 110 and the last time when the loop is finished and then returns to the winding start point 110.

This is further illustrated by the following specific examples.

Example 1

The mandrel 10 has a diameter of 200 mm and the fibers 20 are glass fibers impregnated with epoxy resin. The winding angle α of the fiber 20 in the forward winding is 25 °, and the winding angle γ of the fiber 20 in the reverse winding is 25 °. The lengths of the first winding section a and the third winding section c are both 300 mm, the length of the second winding section b is 1000 mm, and the winding thickness is 10 mm.

Specifically, before the cycle begins, the winding car is first stopped at the wind start 110 but the mandrel 10 is rotated so that the fiber 20 is first wound 4 turns at the wind start 110.

Forward winding, dwell winding and reverse winding are then commenced and the winding carriage is returned to the winding start 110 where the dwell angle β of the mandrel 10 is 80 °, and the above steps are described as a cycle. And repeating the above circulation, and finishing winding after the winding thickness reaches the required 10 mm after a plurality of circulation. After the previous cycle is finished and the winding trolley returns to the winding starting point 110, the winding trolley stays at the winding starting point 110 and the mandrel rotates by the stay angle beta, so that the fibers 20 are wound by the stay angle beta every time when passing through the winding starting point 110 in the middle cycle, and the phenomenon of yarn slipping is avoided.

When the last cycle is finished and the winding thickness reaches the required 10 mm, the winding carriage returns to the winding start 110, at which time the winding carriage is stopped but the core mold 10 continues to rotate, so that the fibers 20 are wound 4 times at the winding start 110.

Example 2

The diameter of the core mold 10 is 180 mm, and the fiber 20 is aramid fiber impregnated with unsaturated resin. The winding angle α of the fiber 20 in the forward winding is 30 °, and the winding angle γ of the fiber 20 in the reverse winding is 30 °. The length of the first winding section a and the third winding section c is 500 mm, the length of the second winding section b is 950 mm, and the winding thickness is 8 mm.

Specifically, before the cycle begins, the winding car is first stopped at the wind up 110 but the mandrel 10 is rotated so that the fiber 20 is first wound 6 turns at the wind up 110.

Forward winding, dwell winding, and reverse winding are then commenced and the winding carriage is returned to the winding start 110 where the dwell angle β of the mandrel 10 is 50 °, recorded as a cycle. And then repeating the above circulation, and finishing winding after the winding thickness reaches the required 8 mm after a plurality of circulation. After the previous cycle is finished and the winding trolley returns to the winding starting point 110, the winding trolley stays at the winding starting point 110 and the mandrel rotates by the stay angle beta, so that the fibers 20 are wound by the stay angle beta every time the fibers pass through the winding starting point 110 during the intermediate cycle, and the phenomenon of yarn slipping is avoided.

When the last cycle is finished and the winding thickness reaches the required 8 mm, the winding carriage returns to the winding start 110, at which time the winding carriage is stopped but the core mold 10 continues to rotate, so that the fibers 20 are wound for 6 turns at the winding start 110.

Example 3

The core mold 10 has a diameter of 160 mm and the fiber 20 is a polyester fiber impregnated with a polyurethane resin. The winding angle α of the fiber 20 in the forward winding is 35 °, and the winding angle γ of the fiber 20 in the reverse winding is 35 °. The length of the first winding section a and the third winding section c is 700 mm, the length of the second winding section b is 1400 mm, and the winding thickness is 12 mm.

Specifically, before the cycle begins, the winding carriage first stops at the wind up 110 but the mandrel 10 rotates so that the fiber 20 is first wound 8 turns at the wind up 110.

Forward winding, dwell winding and reverse winding are then commenced and the winding carriage is returned to the winding start 110 where the dwell angle β of the mandrel 10 is 30 °, recorded as a cycle. And repeating the above circulation, and finishing winding after the winding thickness reaches the required 12 mm after a plurality of circulation. After the previous cycle is finished and the winding trolley returns to the winding starting point 110, the winding trolley stays at the winding starting point 110 and the mandrel rotates by the stay angle beta, so that the fibers 20 are wound by the stay angle beta every time the fibers pass through the winding starting point 110 during the intermediate cycle, and the phenomenon of yarn slipping is avoided.

When the last cycle is finished and the winding thickness reaches the required 12 mm, the winding carriage returns to the winding start 110, at which time the winding carriage is stopped but the core mold 10 continues to rotate, so that the fibers 20 are wound 8 times at the winding start 110.

The specific implementation parameters and the yarn sliding times observed by an operator when the winding is performed for 20 times in the embodiments 1 to 3 of the present invention are as follows:

TABLE 1

According to the statistics of the actual winding condition, the winding method provided by the embodiment of the invention can effectively avoid the phenomenon of yarn slipping, and meanwhile, the pin ring is avoided, namely, a yarn hanging system is not used.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only show some embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A winding method of a small-angle fiber winding pipe is characterized by comprising the following steps:

and (3) staying and winding: the winding trolley keeps still, the core mold continues to rotate by a preset stay angle beta, so that the fibers are continuously wound at the winding end point, and the winding angle alpha of the fibers is converted into 90 degrees; and

2. The method of claim 1, further comprising, before the forward winding begins, the steps of: the winding trolley is still, and the core mould rotates in the circumferential direction, so that the fibers are wound for more than 2 circles at the winding starting point.

3. The method of claim 1, wherein the length of the first wound section and the length of the third wound section are equal.

4. The method of claim 1, wherein a winding angle α in the forward winding is equal to a winding angle γ in the reverse winding.

5. The method of claim 1, wherein the mandrel has a diameter D ≦ 200 mm.

6. The method of claim 1, wherein the dwell angle β is 30 ° to 80 °.

7. The method of claim 1, wherein the first and/or third wound section has a length of 300 mm to 700 mm.

8. The method of claim 1, wherein the forward winding, dwell winding, and reverse winding cycles are performed more than 2 times.

9. The method of claim 8, wherein the fiber is wound at the winding start point for more than 2 cycles before the first cycle is started; after the winding end point of the last cycle is finished, directly finishing winding or enabling the fiber to be wound for more than 2 circles at the winding start point; in each intermediate cycle, the winding carriages are respectively stopped at the winding start point and the winding end point and the core molds are respectively rotated by the stopping angle beta.

10. The method of claim 1, wherein the fibers are fiberglass, aramid, carbon, or polyester fibers impregnated with a resin that is an epoxy, unsaturated, vinyl, or polyurethane resin.