Glass reinforced plastic pipe fixed-length continuous composite winding production process

Abstract

The invention discloses a glass reinforced plastic pipe fixed-length continuous composite winding production process, and relates to the technical field of glass reinforced plastic pipes, and the glass reinforced plastic pipe fixed-length continuous composite winding production process comprises the following steps: S1, winding on a mold of a pipeline winding system to obtain a lining layer; s2, the mold is made to rotate, and a feeding system moves in the axial direction of the mold while feeding materials to the lining layer on the mold so that a structural layer can be manufactured on the outer surface of the lining layer in a winding mode; the plurality of feeding areas comprise a continuous fiber area, a short fiber area and a quartz sand area; s3, when a feeding system moves from one end of the mold to the other end of the mold in the axial direction of the mold, production of a structural layer is completed, and a pipeline is obtained; according to the production process, equipment used by a traditional fixed-length winding process is adopted, the characteristics of simple process and flexibility are achieved, and the thickness uniformity and bending deformation resistance of the outer wall of the pipeline are guaranteed by arranging the uninterrupted continuous fiber area; by controlling the relation between the movement of the feeding area and the rotation of the die, the production speed and the production quality of the pipeline are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of glass fiber reinforced plastic pipes, and more specifically to a fixed-length continuous composite winding production process for glass fiber reinforced plastic pipes. Background Art

[0002] At present, there are two main production processes for FRP pipes: fixed-length winding process and continuous winding process. Fixed-length winding process refers to a production method in which spiral winding and / or circumferential winding process are used on a pipe mold of a certain length to manufacture pipes layer by layer from the inside to the outside within the length of the pipe mold. Continuous winding is a production method in which resin, continuous fiber, chopped fiber and quartz sand are continuously layered according to certain requirements using a circumferential winding method on a continuously output mold, and then cut into a certain length of pipe products after curing.

[0003] The two manufacturing processes, fixed-length winding process and continuous winding process, have their own advantages and disadvantages. The fixed-length winding process is relatively simple and flexible, and the equipment price is much lower than that of the continuous winding process and the centrifugal casting process, but the interlayer performance of its products is worse than that of the continuous winding FRP pipe and the centrifugal casting FRP pipe. The traditional fixed-length winding process adopts a combination of spiral winding and circumferential winding. It is wound layer by layer from the inside to the outside. There is a very clear boundary between the layers. Without short fibers, the interlayer performance is poor, and interface stratification damage will occur when the bending deformation is large. The FRP pipe wall produced by the continuous winding process has a large number of short fibers and no obvious interlayer interface. It has strong resistance to bending deformation, but the equipment and process are relatively complex and less flexible.

[0004] The patent (CN115609897B) discloses a composite winding glass fiber reinforced plastic pipe and a preparation method, wherein "the inner continuous fiber area, the quartz sand area and the outer continuous fiber area are sequentially distributed along the axial direction of the mold on the feeding system, and the quartz sand area and the outer continuous fiber area both store resin and short fibers" and "when the mold rotates one circle along its own axial direction, the moving distance of the feeding system along the axial direction of the mold is less than the width of the feeding area";

[0005] The above patent has the following disadvantages: there is a quartz sand area between the inner continuous fiber area and the outer continuous fiber area, and when the pipeline does not need quartz sand, the discharge port is closed, so that there is a gap between the inner continuous fiber area and the outer continuous fiber area, which affects the uniformity of the thickness of the outer wall of the pipeline and the ability to resist bending deformation; in addition, the feeding system moves too fast or too slow, which will affect the thickness of the pipeline structure layer, and the patent does not give a further relationship between the rotation speed of the mold and the moving speed of the feeding system, and it is impossible to produce pipelines with guaranteed quality. Summary of the invention

[0006] The purpose of the present invention is to solve the above technical problems and provide a production process for the fixed-length continuous composite winding of glass fiber reinforced plastic pipes.

[0007] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0008] A fixed-length continuous composite winding production process for a glass fiber reinforced plastic pipe comprises the following steps:

[0009] S1, winding on a mold of a pipe winding system to obtain an inner lining layer;

[0010] S2, the mold is rotated, and the feeding system feeds the inner lining layer on the mold and moves along the axial direction of the mold at the same time, so as to wind the outer surface of the inner lining layer to make the structural layer; the feeding system includes a frame, a moving component and a plurality of feeding areas, the moving component is used to drive the frame to reciprocate along the axial direction of the mold, the feeding area is arranged on the frame, and the feeding area is used to provide the raw materials required for winding the structural layer on the mold;

[0011] The multiple feeding areas include a continuous fiber area, a short fiber area and a quartz sand area; the continuous fiber area is arranged on one side of the mold, and the short fiber area and the quartz sand area are arranged above the mold;

[0012] The continuous fiber area is used to provide continuous fibers, the short fiber area is used to provide short fibers, and the quartz yarn area is used to provide quartz sand;

[0013] S3. When the feeding system moves from one end of the mold to the other end along the axial direction of the mold, the production of the structural layer is completed to obtain a pipeline.

[0014] The continuous fiber area is consistent with the short fiber area in width, and the quartz sand area is smaller in width than the continuous fiber area.

[0015] The feeding area also includes a first resin area and a second resin area. The first resin area is arranged on the frame, and a composite resin is stored in the first resin area. The continuous fiber is immersed in the first resin area and then entangled with the mold. The second resin area is arranged on the frame and located above the short fiber area. The second resin area stores a composite resin for providing resin. The first resin area is used to wet the continuous fiber, and the second resin area is dripped into the short fiber area and sprinkled on the mold surface together with the short fiber.

[0016] The composite resin is composed of resin, curing agent and accelerator, and the resin, curing agent and accelerator need to be preheated at a temperature of 33-35° C. The mass ratio of the resin, curing agent and accelerator is 1:0.5-0.8:1.6-2. The preheating temperature of the composite resin is set so that the composite resin has an optimal fluid state and prevents the composite resin from curing prematurely.

[0017] In S2, the movement of the frame and the rotation of the mold satisfy the following formula:

[0018] t=πd / v1;.......................Formula 1;

[0019] v2=s2 / t;.......................Formula 2;

[0020] In the formula 1, t is the time taken for the mold to rotate one circle along its own axis; d is the diameter of the mold, 500mm≤d≤1000mm; v1 is the linear velocity of the mold surface, and v1 is a constant, between 40m-50m / min;

[0021] In Formula 2, v2 is the moving speed of the frame along the axial direction of the mold; s2 is the moving distance of the frame along the axial direction of the mold, and s2 is a constant between 0.04m-0.08m;

[0022] Substituting equation 1 into equation 2, we get v2 = s2·v1 / (π·d)...........Equation 3.

[0023] The quartz sand area is provided with a switch, and the switch is used to open and close the discharge port of the quartz sand area. The inner lining layer is made of glass fiber fabric and resin, or glass fiber chopped yarn and resin. In step S3, after the production of the structural layer is completed, an outer protective layer is made on the outside of the structural layer.

[0024] The beneficial effects of the present invention are as follows:

[0025] The fixed-length continuous composite winding production process of the glass fiber reinforced plastic pipe of the present invention has the equipment used in the traditional fixed-length winding process, and has the characteristics of simple process and flexibility, and the prepared composite wound glass fiber reinforced plastic pipe also has the characteristics of strong anti-deformation ability of the glass fiber reinforced plastic pipe made by the continuous winding process;

[0026] By setting up uninterrupted continuous fiber areas, the uniformity of the pipe outer wall thickness and its ability to resist bending deformation are ensured;

[0027] By controlling the relationship between the movement of the feeding area and the rotation of the mold, the production speed and quality of the pipe can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 It is a left-view local structural schematic diagram of the present invention.

[0030] Figure numerals: 1. mold; 2. continuous fiber area; 3. short fiber area; 4. quartz sand area; 5. first resin area; 6. second resin area. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figures 1 to 2 As shown, this embodiment provides a fixed-length continuous composite winding production process for a glass fiber reinforced plastic pipe, comprising the following steps:

[0035] S1, winding on the mold 1 of the pipe winding system to obtain an inner lining layer;

[0036] S2, the mold 1 is rotated, and the feeding system feeds the inner lining layer on the mold 1 and moves along the axial direction of the mold 1 at the same time, so as to wind the outer surface of the inner lining layer to make the structural layer; the feeding system includes a frame, a moving component and a plurality of feeding areas, the moving component is used to drive the frame to reciprocate along the axial direction of the mold 1, the feeding area is arranged on the frame, and the feeding area is used to provide the raw materials required for winding the structural layer on the mold 1;

[0037] The multiple feeding areas include a continuous fiber area 2, a short fiber area 3 and a quartz sand area 4; the continuous fiber area 2 is arranged on one side of the mold 1, and the short fiber area 3 and the quartz sand area 4 are arranged above the mold 1;

[0038] The continuous fiber area 2 is used to provide continuous fibers, the short fiber area 3 is used to provide short fibers, and the quartz yarn area is used to provide quartz sand;

[0039] S3. When the feeding system moves from one end of the mold 1 to the other end along the axial direction of the mold 1, the production of the structural layer is completed to obtain a pipeline.

[0040] The continuous fiber region 2 is consistent with the short fiber region 3 in width, and the quartz sand region 4 is smaller in width than the continuous fiber region 2 .

[0041] The feeding area also includes a first resin area 5 and a second resin area 6. The first resin area 5 is arranged on the frame, and a composite resin is stored in the first resin area 5. The continuous fiber is immersed in the first resin area 5 and then entangled with the mold 1. The second resin area 6 is arranged on the frame and located above the short fiber area 3. The second resin area 6 stores a composite resin for providing resin. The first resin area 5 is used to wet the continuous fiber, and the second resin area 6 is dripped into the short fiber area 3 and sprinkled on the surface of the mold 1 together with the short fiber.

[0042] The composite resin is composed of resin, curing agent and accelerator, and the resin, curing agent and accelerator need to be preheated at a temperature of 33-35° C. The mass ratio of the resin, curing agent and accelerator is 1:0.5-0.8:1.6-2. The preheating temperature of the composite resin is set so that the composite resin has an optimal fluid state and prevents the composite resin from curing prematurely.

[0043] In S2, the movement of the frame and the rotation of the mold 1 satisfy the following formula:

[0044] t=πd / v1;.....................Formula 1;

[0045] v2=s2 / t;.....................Formula 2;

[0046] In the formula 1, t is the time taken by the mold 1 to rotate one circle along its own axis; d is the diameter of the mold 1, 500mm≤d≤1000mm; v1 is the surface linear velocity of the mold 1, and v1 is a constant, between 40m-50m / min;

[0047] In the formula 2, v2 is the moving speed of the frame along the axial direction of the mold 1; s2 is the moving distance of the frame along the axial direction of the mold 1, and s2 is a constant, between 0.04m-0.08m;

[0048] Substituting equation 1 into equation 2, we get v2 = s2·v1 / (π·d)...........Equation 3.

[0049] In Formula 3, the value of s2 is related to the mold diameter. When the mold diameter is not in the range of 500mm-1000mm, s2 will be adjusted appropriately, and the relationship between s2 and d is as follows: s2=k·d. When d is 500mm≤d≤1000mm, k=0.08; when 300<d<500, k=0.075; when d>1000, k=0.09.

[0050] The quartz sand area 4 is provided with a switch, and the switch is used to open and close the discharge port of the quartz sand area 4. The inner lining layer is made of glass fiber fabric and resin, or glass fiber chopped yarn and resin. In step S3, after the production of the structural layer is completed, an outer protective layer is made on the outside of the structural layer.

[0051] In the present invention, the moving component can be a mobile trolley in the prior art, which drives the frame to move along the axial direction of the mold to achieve mobile feeding. Of course, the moving component can also be other structures, which belong to the prior art and will not be repeated here.

Claims

1. A fixed-length continuous composite winding production process for glass fiber reinforced plastic pipes, comprising the following steps: S1, winding on a mold of a pipe winding system to obtain an inner lining layer; S2, the mold is rotated, and the feeding system feeds the inner lining layer on the mold and moves along the axial direction of the mold at the same time, so as to wind the outer surface of the inner lining layer to make the structural layer; the feeding system includes a frame, a moving component and a plurality of feeding areas, the moving component is used to drive the frame to reciprocate along the axial direction of the mold, the feeding area is arranged on the frame, and the feeding area is used to provide the raw materials required for winding the structural layer on the mold; The multiple feeding areas include a continuous fiber area, a short fiber area and a quartz sand area; the continuous fiber area is arranged on one side of the mold, and the short fiber area and the quartz sand area are arranged above the mold; The continuous fiber area is used to provide continuous fibers, the short fiber area is used to provide short fibers, and the quartz yarn area is used to provide quartz sand; S3. When the feeding system moves from one end of the mold to the other end along the axial direction of the mold, the production of the structural layer is completed to obtain a pipeline.

2. The fixed-length continuous composite winding production process of glass fiber reinforced plastic pipe according to claim 1 is characterized in that: The continuous fiber region has the same width as the short fiber region, and the quartz sand region has a smaller width than the continuous fiber region.

3. The fixed-length continuous composite winding production process of glass fiber reinforced plastic pipe according to claim 1 is characterized in that: The feeding area also includes a first resin area and a second resin area. The first resin area is arranged on the frame, and composite resin is stored in the first resin area. The continuous fiber is immersed in the first resin area and then entangled with the mold. The second resin area is arranged on the frame and located above the short fiber area. Composite resin is stored in the second resin area for providing resin.

4. The fixed-length continuous composite winding production process of glass fiber reinforced plastic pipe according to claim 3 is characterized in that: The composite resin is composed of resin, curing agent and accelerator. The resin, curing agent and accelerator need to be preheated at a temperature of 33-35°C.

5. The fixed-length continuous composite winding production process of glass fiber reinforced plastic pipe according to claim 1 is characterized in that: In S2, the movement of the frame and the rotation of the mold satisfy the following formula: t=πd / v1;.......................Formula 1; v2=s2 / t;.......................Formula 2; In the formula 1, t is the time taken for the mold to rotate one circle along its own axis; d is the diameter of the mold, 500mm≤d≤1000mm; v1 is the linear velocity of the mold surface, and v1 is a constant, between 40m-50m / min; In Formula 2, v2 is the moving speed of the frame along the axial direction of the mold; s2 is the moving distance of the frame along the axial direction of the mold, and s2 is a constant between 0.04m-0.08m; Substituting equation 1 into equation 2, we get v2 = s2·v1 / (π·d)...........Equation 3.

6. The fixed-length continuous composite winding production process of glass fiber reinforced plastic pipe according to claim 5 is characterized in that: In Formula 3, the value of s2 is related to the mold diameter. When the mold diameter is not in the range of 500mm-1000mm, s2 will be adjusted appropriately, and the relationship between s2 and d is as follows: s2=k·d, when d is 500mm≤d≤1000mm, k=0.08; when 300<d<500, k=0.075; when d>1000, k=0.09.

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