WO2023103109A1

WO2023103109A1 - Production equipment for fiber reinforced composite pipe

Info

Publication number: WO2023103109A1
Application number: PCT/CN2021/141395
Authority: WO
Inventors: 陈卫; 汪鹏跃; 孙华丽; 李辉; 翁志浩; 李倩
Original assignee: 公元股份有限公司
Priority date: 2021-12-10
Filing date: 2021-12-25
Publication date: 2023-06-15
Also published as: CN114193800A; CN114193800B

Abstract

Production equipment for a fiber reinforced composite pipe, comprising a molding die (1), the molding die (1) comprising an outer die sleeve (1a), a core die (1b), a sizing sleeve (1c) connected to the outlet end of the outer die sleeve (1a), and an air inlet channel (2) connected to the inner cavity of the sizing sleeve (1c), a molding cavity (3) being formed between the outer die sleeve (1a) and the core die (1b), and further comprising an outer pipe (4) and a winding machine (5) capable of wrapping reinforcing fibers on the outer peripheral wall of the outer pipe (4), the tail end of the outer pipe (4) extending into the outer die sleeve (1a) from the entrance end of the outer die sleeve (1a), an annular cavity (6) directly facing the molding cavity (3) being formed between the outer peripheral wall of the outer pipe (4) and the inner peripheral wall of the outer die sleeve (1a), and an air inlet pipe (7) communicating with the air inlet channel (2) being provided inside the outer pipe (4). The production equipment can improve the strength of the fiber reinforced composite pipe while ensuring the stability of the product size.

Description

A kind of production equipment of fiber reinforced composite pipe

technical field

The invention belongs to the technical field of composite pipes, and relates to production equipment for fiber-reinforced composite pipes.

Background technique

With the continuous expansion of cities and the continuous extraction of oil and natural gas, the demand for transportation pipelines is also increasing. Traditional steel pipes have poor corrosion resistance and are not easy to handle, so they can no longer meet the current needs. Due to its low density, high strength, and excellent mechanical properties, such as good processing performance, good chemical resistance and heat resistance, fiber reinforced composite pipes can still be used stably for a long time in some complex environments. Therefore, it is widely used.

Existing fiber-reinforced composite pipes are mainly continuous fiber-reinforced composite pipes. At present, when continuous fiber-reinforced composite pipes are manufactured, the conventional technology is to first extrude the tube blank through an extruder, and then wind the reinforcing fiber on the tube blank through a winding machine. surface, and bonded by adhesive to form a reinforced fiber composite pipe. For example, a plastic pipe forming line disclosed in Chinese patent literature (application number: 201811640324.6; application publication number: CN109664479A). The composite pipe produced by this manufacturing process needs to be wound in multiple layers to ensure that the prepared pipe reaches the required strength. However, due to the small thickness of the continuous fiber, the bonding layer formed by directly winding the surface of the inner pipe is very small, and at the same time The sequential winding of fibers in each layer often results in limited or no bonding in the area where the fibers are in contact, resulting in weak bonding between layers and limited improvement in the quality, especially the strength, of the composite pipe.

In addition to continuous reinforced fiber composite pipes, there are also fiber reinforced composite pipes that form a multi-layer structure by mixing chopped fibers into a hot melt and co-extruding through an extrusion die. In the extrusion die, a gas channel is usually provided to introduce the external gas into the mold and communicate with the inside of the forming tube, so that the inside of the formed tube can maintain a certain pressure and avoid deformation of the tube. And in order to realize that the gas from the outside passes into the mold, the conventional design is to provide an inlet for the gas to enter on the side wall of the mold. For example, a co-extrusion die for rodent-resistant silicon core tubes disclosed in Chinese patent literature (application number: 202022849645.6) connects a confluence core to the front side of the forming core, so that the rodent-resistant silicon core tubes produced have a three-layer structure. At the same time, the inlet of the air inlet hole in the mold is located on the side wall of the mold, so that the gas can enter the mold to support the finished shaping pipeline and avoid pipeline deformation. This mold structure cannot realize the extrusion of continuous fiber composite pipes, but can only mix chopped fibers into hot melt for multi-layer co-extrusion to form multi-layer fiber reinforced composite pipes. Compared with continuous fiber reinforced composite pipes , the pipe performance, especially the difference in shear strength is more obvious.

Contents of the invention

The purpose of the present invention is to solve the above problems in the existing technology and propose a production equipment for fiber reinforced composite pipes. The technical problem solved by the present invention is to improve the strength of fiber reinforced composite pipes while ensuring the stability of product dimensions.

The purpose of the present invention can be achieved through the following technical solutions: a production equipment for fiber reinforced composite pipes, including a molding die, the molding die includes an outer mold sleeve, a core mold, and a sizing tube connected to the outlet end of the outer mold sleeve The sleeve and the air inlet channel connected with the inner cavity of the sizing sleeve, a molding cavity is formed between the outer mold sleeve and the mandrel, it is characterized in that the production equipment also includes an outer tube and a reinforcing fiber coating The winding machine on the outer peripheral wall of the outer tube, the tail end of the outer tube extends into the outer mold sleeve from the inlet end of the outer mold sleeve, and the outer peripheral wall of the outer tube and the inner peripheral wall of the outer mold sleeve are formed and formed An annular cavity directly facing the cavity, and an air intake pipe communicating with the air intake passage is also arranged inside the outer tube.

The function of the forming cavity in the forming mold is to allow the molten material to flow through, so that a pipe with the required cross-sectional shape is formed in the forming cavity. In the process of pipe production, it is usually necessary to use a tractor to pull the formed pipe forward, so that the pipe can continuously protrude from the forming mold to realize continuous production. The production equipment is equipped with an outer tube. During manufacture, the continuous reinforcing fiber is wound on the outer peripheral wall of the outer tube by relying on the existing fiber winding device such as a winding machine. At this time, due to the formation of a The ring-shaped cavity facing the forming cavity, so under the action of the tractor, the reinforcing fiber will continuously pass through the forming cavity, meet and recombine with the molten material in the forming cavity, and finally form a fiber-reinforced composite pipe from the forming mold The outlet end of the pipe protrudes out, and then passes through the sizing sleeve to sizing, the pipeline cooling equipment to shape, and then connects to the tractor.

In this production equipment, the air inlet channel is connected with the inner cavity of the sizing sleeve, so that the gas in the air inlet channel can reach the inner hole of the composite pipe, forming a support for the pipe to avoid deformation of the inner bed of the pipe, thereby ensuring the stability of the product size sex. At the same time, different from the conventional design, in this production equipment, the air intake pipe is provided in the outer pipe, and the air intake pipe is used to supply gas to the air intake passage, so as to ensure that the reinforcing fiber wound on the outer pipe can enter the molding mold smoothly, so that the molten material and The continuous reinforcing fiber is formed into a composite pipe in one step in the forming mold, so that the molten material can be compatible and infiltrated with the reinforcing fiber in the forming mold, so the bonding effect is better and the strength is higher, and there is no composite pipe produced by existing equipment. The weak interlayer bonding of the pipe causes the strength of the pipe to weaken. Therefore, the continuous fiber reinforced composite pipe produced by this production equipment has better strength.

In the above-mentioned production equipment for fiber reinforced composite pipes, the air inlet pipe and the outer pipe are parallel to each other, a through hole is opened on the side wall of the head end of the outer pipe, and the inlet end of the air inlet pipe passes through the through hole. outer tube. A through hole is set at the head end of the outer tube, so that the inlet end of the intake pipe passes through the outer tube through the through hole. This design makes the entire outer tube basically capable of being wound with reinforcing fibers, so that it can be wound along the length of the outer tube. Set up at least two winding machines in sequence to wind the reinforcing fibers onto the outer pipe at different angles, increase the thickness of the limiting reinforcement layer of the composite pipe, and then increase the strength of the composite pipe.

In the above-mentioned production equipment for fiber-reinforced composite pipes, the production equipment also includes an extruder and a core tube pierced in the outer tube. The outlet end of the core tube extends into the forming mold and the outlet of the core tube faces the flow divider. The molten material extruded by the extruder is delivered to the molding die through the core tube located in the outer tube, and such a delivery method will not affect the winding of the reinforcing fiber on the outer peripheral wall of the outer tube. The outlet of the core tube is directly opposite to the splitter, so that the splitter can diffuse the molten material flowing out of the core tube radially to the surroundings, which facilitates the heating and plasticization of the molten material, improves the bonding effect of the reinforcing fiber and the molten material, and then improves the strength of the pipeline .

In the above-mentioned production equipment for fiber-reinforced composite pipes, the outlet end of the core pipe is also fixedly provided with a connecting sleeve, the outer peripheral wall of the connecting sleeve is against the inner peripheral wall of the outer pipe, and the connecting sleeve is provided with An insertion hole communicated with the air intake channel, the outlet end of the air intake pipe is inserted into the insertion hole. The function of the connecting sleeve is to support the outlet end of the core tube, so that the core tube is stable; the second is to set the socket hole on the connecting sleeve to fix the outlet end of the air intake pipe, and to make the air intake pipe and the air intake channel Third, the connecting sleeve can also be used for fixing the splitter, so that there is a gap between the outer peripheral wall of the splitter and the inner peripheral wall of the outer mold casing, and the splitter is suspended relative to the outer mold casing, so that the reinforcing fiber can be smoothly through the forming die.

In the above-mentioned production equipment for fiber-reinforced composite pipes, an axial hole is opened at the front end of the mandrel, and the flow divider includes a cylindrical connection part and a flow splitter set in the inner hole of the connection part. The column is plugged into the axial hole, and the axial hole is also pierced with a fastener that is screwed to the shunt column and securely connects the shunt to the mandrel. Such a design not only ensures a stable connection between the splitter and the core mold, but also creates a gap between the outer peripheral wall of the core mold and the inner peripheral wall of the outer mold casing, and the core mold is suspended relative to the outer mold casing so that the reinforcing fiber Can pass through the forming mold smoothly. Preferably, the connecting part of the flow divider is connected to the connecting sleeve through several bolts, and the connecting part and the shunt post are connected through several connecting pieces.

In the above-mentioned production equipment for fiber reinforced composite pipes, the fasteners are bolts, and the splitter column is axially provided with threaded holes that are threadedly connected with the fasteners, and the axial center hole has a stepped surface. and the second step surface, the head of the fastener abuts on the first step surface, and the end surface of the splitter column abuts on the second step surface. When the fastener is tightened, the fastener presses the step surface 2 on the end face of the shunt column, realizing the connection of the mandrel and the shunt. Such a connection method is not only convenient for assembly, but also has good connection stability.

In the above-mentioned production equipment for fiber reinforced composite pipes, the inside of the mandrel has an air accumulator chamber connected to the air intake channel, the air accumulator chamber has an opening on the rear end face of the mandrel, and the upper cover of the opening A cover plate is fixedly connected with the mandrel, and the cover plate is provided with a ventilation hole for connecting the air storage cavity and the inner cavity of the sizing sleeve. The gas in the gas storage chamber enters the inner cavity of the sizing sleeve through the vent hole. The setting of the gas storage chamber can ensure that there is always enough gas to be transported into the sizing sleeve, and then ensure that the composite pipe can always be stably supported by the gas, avoid deformation of the inner bed of the pipe, and then ensure that the manufactured composite pipe has excellent dimensional stability .

In the above-mentioned production equipment of fiber-reinforced composite pipes, the air inlet channel includes an axial through hole set on the fastener, and an axial air hole I set on the splitter column and connected to the axial through hole, so The first axial air hole and the axial through hole are arranged concentrically, and the connecting part is also provided with the second axial air hole parallel to the first axial air hole, and the passage between the first axial air hole and the second axial air hole The radial air holes are in communication, and the second axial air hole is in communication with the outlet of the intake pipe. A core pipe is arranged in the outer pipe, so the air intake pipe can only be arranged on one side of the core pipe. At this time, through the radial air holes, the gas in the intake pipe can flow to the center of the mandrel through the radial air holes, and finally be discharged from the axial through holes on the fastener. This design makes the outlet of the air intake channel located at the core On the axis of the mold, it is beneficial to improve the balance of the gas pressure inside the gas storage chamber and the sizing sleeve, that is, to avoid the situation of large air pressure deviation at different positions, so that the pressure of the composite pipe is balanced and the dimensional stability is guaranteed.

In the above-mentioned production equipment for fiber-reinforced composite pipes, an air plug is also provided in the sizing sleeve, and the air plug is fixedly connected to the cover plate through a pull rod. The outer peripheral wall of the air plug and the sizing sleeve There is a gap between the inner peripheral walls of the air plug, and the end face of the air plug facing the mandrel is in the shape of a cone. The conical end surface design, on the one hand, has a guiding effect, so that the composite pipe can pass through the gap between the gas plug and the sizing sleeve smoothly; on the other hand, when the gas reaches the gas plug, it will impact the end surface of the gas plug , so that the gas will be guided by the end surface to diffuse to the surroundings, so that the gas can be used to better support the inner peripheral wall of the composite pipe, and ensure that the manufactured composite pipe has excellent dimensional stability.

In the above-mentioned production equipment for fiber-reinforced composite pipes, the outer peripheral wall of the core pipe is covered with several support sleeves, the outer peripheral wall of the support sleeve is against the inner peripheral wall of the outer pipe, and the several support sleeves are placed along the core pipe. The length direction of the tubes is arranged at intervals in sequence, and each support sleeve is provided with a through hole for the intake pipe to pass through. Through the design of several support sleeves, the core pipe and the intake pipe are supported at multiple positions, so that the straightness and stability of the core pipe and the intake pipe are guaranteed.

Compared with the prior art, the production equipment of this fiber reinforced composite pipe has the following advantages:

1. The molding equipment of this composite pipe is formed into a composite pipe by one-step molding of the molten material and continuous reinforcing fibers in the molding mold, so that the molten material can be compatible and infiltrated with the reinforcing fibers in the molding mold, so the bonding effect is better. The strength is higher, and there is no problem of weakening the strength of the pipeline caused by the weak interlayer bonding existing in the composite pipeline produced by the existing equipment, so the produced continuous fiber reinforced composite pipeline has better strength.

2. In this production equipment, the air intake pipe is arranged in the outer pipe, and the air intake pipe is used to supply gas to the air intake channel, and the air inlet pipe is passed through the head end of the outer pipe, so at least two sets can be arranged in sequence along the length direction of the outer pipe. The winding machine is used to wind the reinforcing fiber to the outer pipe at different angles, so as to increase the thickness of the composite pipe limit reinforcement layer, thereby increasing the strength of the composite pipe.

Description of drawings

Fig. 1 is a three-dimensional structure diagram of the production equipment.

Fig. 2 is a partial sectional view of the production equipment.

Fig. 3 is a partial sectional view II of the production equipment.

Fig. 4 is an enlarged view at point A in Fig. 3 .

Fig. 5 is a three-dimensional structure diagram of a flow divider.

In the figure, 1, forming mold; 1a, outer mold cover; 1b, mandrel; 1b1, axial hole; 1b2, step surface one; 1b3, step surface two; 1b4, air storage cavity; 1b5, opening; Diameter sleeve; 1d, diverter; 1d1, connecting part; 1d2, shunt column; 1d3, connecting piece; 1e, cover plate; 1e1, air hole; 1f, air plug; 1g, tie rod; Axial through hole; 22. Axial air hole one; 23. Axial air hole two; 24. Radial air hole; 3. Forming cavity; 4. Outer tube; 5. Winding machine; 6. Annular cavity; 7. Intake pipe; 8, through hole; 9, extruder; 10, core pipe; 11, connecting sleeve; 111, socket hole; 12, threaded hole; 13, discharge pipe; 14, support sleeve; 141, through hole ; 15, support frame; 16, fasteners.

Detailed ways

The following is a specific embodiment of the present invention and in conjunction with the accompanying drawings, further describes the technical solution of the present invention, but the present invention is not limited to this embodiment.

As shown in Figures 1 and 2, the production equipment of the fiber reinforced composite pipe includes a molding die 1, a winding machine 5, an extruder 9, an outer pipe 4 and a core pipe 10 pierced in the outer pipe 4, etc., wherein, As shown in Figures 2 and 3, the molding die 1 includes an outer mold casing 1a, a core mold 1b, a sizing sleeve 1c connected to the outlet end of the outer mold casing 1a, and an inlet connected to the inner cavity of the sizing sleeve 1c. The air channel 2, the forming cavity 3 is formed between the outer mold casing 1a and the core mold 1b, and the head end of the outer tube 4 and the inlet end of the core tube 10 are connected to the support frame 15. The tail end of the outer tube 4 extends into the outer mold sleeve 1a from the inlet end of the outer mold sleeve 1a, and an annular cavity facing the molding cavity 3 is formed between the outer peripheral wall of the outer tube 4 and the inner peripheral wall of the outer mold sleeve 1a 6. An air intake pipe 7 communicating with the air intake channel 2 is also provided inside the outer pipe 4 .

As shown in Figure 3 and Figure 4, the front end of the mandrel 1b is provided with an axial center hole 1b1, and the front end of the mandrel 1b is connected with a flow divider 1d, and the outlet end of the core tube 10 is also fixedly provided with a connecting sleeve 11, the connecting sleeve The outer peripheral wall of 11 leans against the inner peripheral wall of the outer pipe 4, and the connecting sleeve 11 is provided with an insertion hole 111 communicating with the air inlet passage 2, and the outlet end of the air inlet pipe 7 is inserted in the insertion hole 111, and the core pipe The inlet end of 10 communicates with the extruder 9 through the discharge pipe 13, the outlet end of the core tube 10 extends into the molding die 1 and the outlet of the core tube 10 faces the flow divider 1d. As shown in Fig. 5, the flow divider 1d includes a cylindrical connection part 1d1 and a shunt post 1d2 arranged in the inner hole of the connection part 1d1, and the connection part 1d1 and the shunt post 1d2 are connected by several connecting pieces 1d3.

As shown in FIG. 2 , in order to realize the installation of the flow divider 1d and the mandrel 1b, the connection part 1d1 of the flow divider 1d is connected to the connection sleeve 11 by several bolts. As shown in Figure 4, the splitter column 1d2 is plugged into the axial center hole 1b1, and the axial center hole 1b1 is also pierced with a fastener that is screwed to the splitter column 1d2 and firmly connects the splitter 1d to the mandrel 1b 16. Specifically, the fastener 16 is a bolt, and a threaded hole 12 threaded with the fastener 16 is provided on the shunt column 1d2 in the axial direction, and the axial hole 1b1 has a step surface 1b2 and a step surface 2 1b3. The head of 16 abuts against the first step surface 1b2, and the end surface of the splitter column 1d2 abuts against the second step surface 1b3. When the fastener 16 is tightened, the fastener 16 presses the stepped surface 1b3 against the end surface of the splitter column 1d2, realizing the connection between the mandrel 1b and the splitter 1d. Such a connection method is not only convenient for assembly, but also has good connection stability.

As shown in Figure 2, the inside of the core mold 1b has an air storage chamber 1b4 that communicates with the outlet of the air intake passage 2. The air storage chamber 1b4 has an opening 1b5 located on the rear end face of the core mold 1b. The opening 1b5 is covered with a core The mold 1b is fixedly connected to the cover plate 1e, and the cover plate 1e is provided with a vent hole 1e1 that communicates the air storage chamber 1b4 with the inner cavity of the sizing sleeve 1c. The air intake passage 2 includes an axial through hole 21 provided on the fastener 16, an axial air hole 22 provided on the splitter column 1d2 and connected to the axial through hole 21, and an axial air hole 22 and the axial through hole 22. Holes 21 are set coaxially, and the connecting portion 1d1 is also provided with axial air hole 2 23 parallel to axial air hole 1 22, axial air hole 1 22 and axial air hole 2 23 are connected through radial air hole 24, and the axial The outlet of the air hole two 23 is connected with the intake pipe 7 . There is also an air plug 1f inside the sizing sleeve 1c, and the air plug 1f is fixedly connected to the cover plate 1e through a tie rod 1g. There is a gap between the outer peripheral wall of the air plug 1f and the inner peripheral wall of the sizing sleeve 1c, and the air plug 1f faces the core The end face of the die 1b is tapered.

As shown in Figure 3, three supporting sleeves 14 are set on the outer peripheral wall of the core tube 10, and the outer peripheral wall of the supporting sleeve 14 is against the inner peripheral wall of the outer tube 4, and the three supporting sleeves 14 are spaced sequentially along the length direction of the core tube 10. It is provided that each support sleeve 14 is provided with a via hole 141 through which the intake pipe 7 passes. Certainly, the quantity of support sleeve 14 can increase or decrease according to actual conditions, as setting two, four or five support sleeves 14. Intake pipe 7 and outer pipe 4 are parallel to each other, and the side wall of outer pipe 4 head end is provided with through hole 8, and the entrance end of air inlet pipe 7 passes outer pipe 4 by through hole 8, and such design makes whole outer pipe 4 basically Both of them can be used for winding the reinforcing fibers, so that at least two winding machines 5 can be arranged sequentially along the length direction of the outer tube 4 to wind the reinforcing fibers onto the outer tube 4 at different angles.

In the process of producing the pipeline, the formed pipeline is pulled forward by a tractor, so that the pipeline is continuously protruded from the forming mold 1 to realize continuous production. Tractor is prior art, not shown in the figure. The forming equipment is equipped with an outer tube 4, and relies on existing fiber winding devices, such as a winding machine 5 and an axial yarn feeding structure, to wrap continuous reinforcing fibers on the outer peripheral wall of the outer tube 4 during manufacture. The axial yarn feeding structure covers the outer peripheral wall of the outer tube 4 with a number of continuous reinforcing fibers arranged axially along the outer tube 4 to form an axial fiber layer, and the winding machine 5 winds the continuous reinforcing fibers around the shaft in the circumferential direction. towards the outside of the fiber layer.

Since the annular cavity 6 through which the reinforcing fiber passes is formed between the outer peripheral wall of the outer tube 4 and the inner peripheral wall of the outer mold casing 1a, the reinforcing fiber will continuously pass through the molding cavity of the molding die 1 under the action of the tractor Road 3, intersects with the molten material to form a composite state, and finally forms a fiber-reinforced composite pipe that protrudes from the rear end of the forming mold 1, and then passes through the sizing sleeve 1c for sizing, the pipe cooling equipment for shaping, and then connects to the tractor. And because the air inlet channel 2 communicates with the inner cavity of the sizing sleeve 1c, the gas in the air inlet channel 2 can reach the inner hole of the composite pipe, forming a support for the pipe to avoid deformation of the inner bed of the pipe, thereby ensuring the stability of the product size sex.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Although this article uses 1, forming mold; 1a, outer mold sleeve; 1b, mandrel; 1b1, axial hole; 1b2, step surface one; 1b3, step surface two; 1b4, air storage cavity; 1b5, opening ;1c, sizing sleeve; 1d, flow divider; 1d1, connecting part; 1d2, shunt column; 1d3, connecting piece; 1e, cover plate; 1e1, air hole; 1f, air plug; Channel; 21, axial through hole; 22, axial air hole one; 23, axial air hole two; 24, radial air hole; 3, forming cavity; 4, outer tube; 5, winding machine; 6, annular cavity 7, air intake pipe; 8, through hole; 9, extruder; 10, core pipe; 11, connecting sleeve; 111, socket hole; 12, threaded hole; 13, discharge pipe; 14, support sleeve; 141. Vias; 15. Support frame; 16. Fasteners and other terms, but the possibility of using other terms is not excluded. These terms are used only for the purpose of describing and explaining the essence of the present invention more conveniently; interpreting them as any kind of additional limitation is against the spirit of the present invention.

Claims

A kind of production equipment of fiber-reinforced composite pipe, comprising forming mold (1), described forming mold (1) comprises outer mold cover (1a), core mold (1b), is connected with the outlet end of outer mold cover (1a) The sizing sleeve (1c) and the air inlet passage (2) communicated with the inner cavity of the sizing sleeve (1c), and a molding cavity ( 3), it is characterized in that the production equipment also includes an outer tube (4) and a winding machine (5) capable of wrapping reinforcing fibers on the outer peripheral wall of the outer tube (4), and the tail end of the outer tube (4) The inlet end of the outer mold casing (1a) extends into the outer mold casing (1a), and a molding cavity (3) is formed between the outer peripheral wall of the outer tube (4) and the inner peripheral wall of the outer mold casing (1a). Opposite to the annular cavity (6), the outer pipe (4) is also provided with an air inlet pipe (7) communicating with the air inlet passage (2).
The production equipment of fiber-reinforced composite pipe according to claim 1, characterized in that, the air inlet pipe (7) and the outer pipe (4) are parallel to each other, and the side wall of the head end of the outer pipe (4) is provided with an opening hole (8), the inlet end of the air inlet pipe (7) passes through the outer pipe (4) through the through hole (8).
The production equipment of fiber-reinforced composite pipe according to claim 2, characterized in that, the production equipment also includes an extruder (9) and a core pipe (10) pierced in the outer pipe (4), the mandrel The front end of (1b) is connected with a splitter (1d), the inlet end of the core tube (10) communicates with the extruder (9), and the outlet end of the core tube (10) extends into the molding die (1) And the outlet of the core pipe (10) is opposite to the flow divider (1d).
The production equipment of fiber reinforced composite pipe according to claim 3, characterized in that, the outlet end of the core pipe (10) is also fixedly provided with a connecting sleeve (11), and the outer peripheral wall of the connecting sleeve (11) Against the inner peripheral wall of the outer pipe (4), the connecting sleeve (11) is provided with an insertion hole (111) communicating with the air inlet passage (2), and the outlet end of the air inlet pipe (7) is inserted into the Set in the insertion hole (111).
The production equipment of fiber reinforced composite pipe according to claim 3 or 4, characterized in that, the front end of the mandrel (1b) is provided with an axial center hole (1b1), and the flow divider (1d) includes a cylindrical shaped connection part (1d1) and the shunt post (1d2) arranged in the inner hole of the connection part (1d1), the shunt post (1d2) is plugged into the shaft center hole (1b1), and the shaft center hole (1b1) is also pierced with a fastener (16) that is screwed to the shunt post (1d2) and firmly connects the shunt (1d) to the mandrel (1b).
The production equipment for fiber-reinforced composite pipes according to claim 5, characterized in that, the fasteners (16) are bolts, and the splitter column (1d2) is axially provided with fasteners (16) A threaded hole (12) for threaded connection, the shaft center hole (1b1) has a step surface one (1b2) and a step surface two (1b3), and the head of the fastener (16) is against the step surface one (1b2), the end surface of the splitter column (1d2) abuts against the second step surface (1b3).
The production equipment of fiber-reinforced composite pipe according to claim 1 or 2 or 3 or 4, characterized in that the mandrel (1b) has an air storage cavity (1b4) connected to the air inlet channel (2) inside , the air storage chamber (1b4) has an opening (1b5) located on the rear end face of the mandrel (1b), and the opening (1b5) is covered with a cover plate (1e) fixedly connected to the mandrel (1b) , the cover plate (1e) is provided with a vent hole (1e1) that communicates the air storage chamber (1b4) with the inner cavity of the sizing sleeve (1c).
The production equipment of fiber-reinforced composite pipe according to claim 5, characterized in that, the air intake channel (2) includes an axial through hole (21) opened on the fastener (16), an Axial air hole one (22) on (1d2) and in contact with the axial through hole (21), the axial air hole one (22) and the axial through hole (21) are arranged concentrically, and the connecting part (1d1) is also provided with axial air hole two (23) parallel to axial air hole one (22), and the radial air hole (23) is passed between the axial air hole one (22) and the axial air hole two (23). 24) communicated, the second axial air hole (23) is communicated with the outlet of the intake pipe (7).
The production equipment of fiber-reinforced composite pipe according to claim 7, characterized in that, an air plug (1f) is also provided in the sizing sleeve (1c), and the air plug (1f) is fixed by a pull rod (1g) Connected to the cover plate (1e), there is a gap between the outer peripheral wall of the air plug (1f) and the inner peripheral wall of the sizing sleeve (1c), and the air plug (1f) faces the core mold (1b) The end face is conical.
The production equipment of fiber reinforced composite pipe according to claim 3, characterized in that, several support sleeves (14) are sheathed on the outer peripheral wall of the core pipe (10), and the outer circumference of the support sleeve (14) The wall leans against the inner peripheral wall of the outer tube (4), and several support sleeves (14) are arranged at intervals along the length direction of the core tube (10), and each support sleeve (14) is provided with a hole for the intake pipe (7) to pass through. through vias (141).