WO2023103105A1 - Device for producing reinforced and toughened composite pipe - Google Patents

Abstract

The present invention relates to the technical field of composite pipes, and provides a device for producing a reinforced and toughened composite pipe. The present invention solves the problem in the prior art that composite pipes are weak in strength. The device for producing a reinforced and toughened composite pipe comprises an extruder, a forming mold, a core pipe communicated with the extruder, an outer pipe sleeved outside the core pipe, and a winding machine capable of coating the outer peripheral wall of the outer pipe with reinforcing fibers; a forming cavity is formed between a core mold and an outer mold sleeve of the forming mold; an outlet end of the core pipe extends into the forming mold and is communicated with the forming cavity of the forming mold; one end of the outer pipe is connected to the forming mold; and a reinforcing fiber layer on the outer peripheral wall of the outer pipe can penetrate through the forming cavity. A composite pipe produced by the production device has the advantages of high strength and good toughness.

Description

A kind of production equipment of reinforced and toughened composite pipe technical field

The invention belongs to the technical field of composite pipes, and relates to production equipment for reinforced and toughened 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. At the same time, my country's main oil and natural gas are mostly distributed in deserts, swamps or mountainous areas, and the natural environment is relatively harsh. When laying steel pipelines, it is seriously affected by the natural environment, and due to ground subsidence, landslides and other reasons, the pipelines are extremely prone to damage. Phenomenon. 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 usually include a three-layer structure of inner layer, reinforced layer and outer layer from the inside to the outside. The reinforced fiber on the top is used to achieve the purpose of improving the structural strength of the plastic pipe, and the outer layer is a plastic layer attached to the reinforced layer. At present, although the structures of the equipment for manufacturing reinforced fiber composite pipes are different, the manufacturing principles are basically the same, mainly extruding the tube blank through the extruder, and then winding the reinforcing fiber on the surface of the tube blank through the winding machine. Bonded by adhesives to form reinforced fiber composite pipes. For example, a plastic pipeline molding line disclosed in Chinese patent literature (application number: 201811640324.6; application publication number: CN109664479 A), the outflow line enters the molding mold through the plasticized raw material in the first extruder and makes the plasticized raw material shaped Then move through the first shaping machine to shape and cool the inner tube, and then pass through the tape machine and the winding machine in turn. The tape machine attaches the first reinforcing tape to the surface of the inner tube in the axial direction, and the winding machine attaches the second A reinforcing tape is helically wound onto the surface of the inner tube. Afterwards, the inner tube moves through the compound mold, the second extruder wraps the plasticized raw material on the inner tube and shapes it into a composite tube, and finally the composite tube moves through the second shaping machine and is shaped and cooled. The composite pipe produced by this equipment needs to be wound in multiple layers to ensure that the prepared pipe reaches the required strength. However, because the thickness of the continuous fiber is very small, the bonding layer formed by directly winding the surface of the inner pipe is very small. At the same time, each Sequential winding of layers of fibers often results in limited or no bonding in the area where the fibers are in contact, resulting in weak interlayer bonding and limited improvement in the quality, especially the strength, of the composite pipe.

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 reinforced and toughened composite pipes. The technical problem to be solved by the present invention is how to make the produced composite pipes have higher strength performance.

The purpose of the present invention can be achieved through the following technical solutions: a production equipment for reinforced and toughened composite pipes, including an extruder and a molding die, a molding cavity is formed between the core mold and the outer mold casing of the molding die, It is characterized in that the production equipment also includes a core tube connected with the extruder, an outer tube sleeved outside the core tube, and a winding machine capable of wrapping reinforcing fibers on the outer peripheral wall of the outer tube, the outlet of the core tube One end of the outer tube extends into the molding die and communicates with the molding cavity of the molding die, one end of the outer tube is connected with the molding die, and the reinforcing fiber layer on the outer peripheral wall of the outer tube can pass through the molding cavity.

In this production equipment, a forming cavity is formed between the core mold of the forming mold and the outer mold sleeve, and the function of the forming cavity is to make the pipe protrude out of the forming mold with the required cross-sectional shape. The core tube is connected with the extruder, so that the molten material extruded by the extruder can enter the core tube, and the molten material flowing out of the core tube will finally enter the forming cavity of the forming mold. By sheathing the outer tube on the outside of the core tube, the fiber covering mechanism directly coats the reinforcing fiber on the outer peripheral wall of the outer tube, and since one end of the outer tube is connected to the molding die and the reinforcing fiber layer on the outer peripheral wall of the outer tube can Pass through the forming cavity, so that the molten material flowing out of the core tube can be combined with the reinforcing fiber in the forming cavity, and then form a fiber-reinforced composite pipe protruding from the outlet end of the forming cavity, and then transported to the vacuum calibrating box for further processing Set to cool.

Obviously, the production equipment of this composite pipe is completely different from the production principle of the existing equipment. This production equipment does not first extrude the tube blank through the extruder, and then wind the reinforcing fiber on the surface of the tube blank through the winding machine, but The molten material and the continuous reinforcing fiber are 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 existing equipment The produced composite pipe has the problem that the strength of the pipe is weakened due to weak bonding between the layers.

In the above-mentioned production equipment for reinforced and toughened composite pipes, one end of the outer pipe extends into the outer mold casing and is arranged concentrically with the outer mold casing, and the outer peripheral wall of the outer pipe and the inner peripheral wall of the outer mold casing A ring-shaped cavity directly opposite to the forming cavity is formed between them. Through this design, the reinforcing fibers on the outer peripheral wall of the outer pipe can enter the forming mold more smoothly, avoiding the influence of the reinforcing fibers entering the forming mold on the winding angle and winding tension of the reinforcing fibers, and thus improving the composite pipe. The quality and strength of the product.

In the above-mentioned production equipment for reinforced and toughened composite pipe, a flow divider is also provided in the outer mold casing, the flow divider is connected to the front end of the mandrel, and the outlet end of the core pipe is directly opposite to the flow divider. It is the prior art in the field of moulds, that the shunt is arranged in the mould. The outlet end of the core tube is directly facing the splitter, so that the splitter can spread the molten material flowing out of the core tube radially to the surroundings, which facilitates further heating and plasticization, improves the bonding effect of the reinforcing fiber and the molten material, and then improves the pipe's durability. strength.

In the above-mentioned production equipment for reinforced and toughened composite pipe, 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 flow divider passes through the tight The firmware is fixedly connected to the connecting sleeve. Through this design, on the one hand, the stability of the outlet end of the core tube is ensured, and on the other hand, the installation of the flow divider is realized, so that the outer peripheral wall of the flow divider and the inner peripheral wall of the outer mold casing form a gap for the reinforcement fiber to pass through. Preferably, the fastener is a bolt, and the connecting sleeve is provided with eight bolt through holes along its circumference, and the shunt is provided with eight bolt holes corresponding to the bolt through holes one by one, and each bolt through hole Bolts are all pierced, and the bolts pass through the bolt through holes and are threadedly connected with the corresponding bolt holes.

In the above-mentioned production equipment for reinforced and toughened composite pipes, the production equipment also includes a mold support for supporting and fixing the outer mold sleeve, the mold support can move back and forth along the axial direction of the outer pipe, and the mold support moves away from After the direction of the outer tube moves, the core mold can be separated from the outer mold sleeve. Mandrel, shunt, inner pipe and outer pipe are solidly connected together. In the preparation work before production, it is necessary to pass the continuous reinforcing fiber through the forming mold and connect it to the tractor. Therefore, the outer mold sleeve is supported and fixed by the movable mold bracket, so that the movement of the mold bracket can drive the outer mold sleeve together. Move to achieve demoulding, that is, to realize that the core mold is released from the outer mold sleeve, so that the continuous reinforcing fiber can be easily passed through the inside of the outer mold sleeve and connected to the tractor. After the reinforcing fiber is connected, the outer mold The sleeve is reset, locked, and then production work begins. This method realizes the arrangement of the continuous reinforcing fibers in the forming mold, making the manufacturing process very convenient.

In the above production equipment for reinforced and toughened composite pipe, the production equipment also includes an outer pipe support frame, and the other end of the outer pipe and the inlet end of the core pipe are both connected to the outer pipe support frame.

In the production equipment of the above-mentioned reinforced and toughened composite pipe, the production equipment also includes a roller bracket located at the side of the mold bracket, and the roller bracket is provided with a roller located under the outer tube, and the roller can be positioned on the outer peripheral wall of the outer tube. reinforced fibers for rolling support. The outer peripheral wall of the outer tube needs to form an annular cavity with the outer mold casing for the reinforcing fiber to pass through, so the outer tube and the outer mold casing need to be concentric. The core tube and the outer mold sleeve must also be concentric, so that the outlet end of the core tube is directly opposite to the flow divider without eccentricity. Therefore, the installation stability of the outer tube and the core tube, as well as the concentricity of the outer tube, the core tube and the outer mold casing, directly affect the quality of the product. By setting the outer tube support frame and rollers, both ends of the outer tube are supported, which ensures the stability of the outer tube installation, and then also ensures the high stability of the core tube in the outer tube, avoiding the decrease in stability The concentricity between the outer tube, the core tube and the outer mold sleeve is reduced, thereby ensuring the quality of the product. When the reinforcing fiber moves relative to the outer tube, the roller forms a rolling support for the reinforcing fiber. This method not only plays a supporting role, but also avoids hard friction on the reinforcing fiber, and protects the reinforcing fiber. Pipeline product quality is stable.

In the above-mentioned production equipment for reinforced and toughened composite pipe, a plurality of annular heating rings are sheathed on the outer wall of the outer mold casing, and each heating ring is arranged in sequence along the axial direction of the outer mold casing. This design makes the heating more uniform, improves the bonding effect of the reinforcing fiber and the molten material, and thus improves the strength of the pipeline.

In the above-mentioned production equipment for reinforced and toughened composite pipe, the number of the winding machines is two, and the two winding machines are arranged in sequence along the axial direction of the outer pipe. Winding machines are known in the art and are used to wind reinforcing fibers in the circumferential direction of the outer tube. By setting up two winding machines, the two winding machines can wind the reinforcing fibers around the outer circumference of the axial reinforcing fibers at different winding angles, so that the winding thickness of the circumferential fibers is increased, and the ring stiffness of the composite pipe is increased. Improve the strength of the composite pipe.

In the production equipment of the above-mentioned reinforced and toughened composite pipe, the extruder is connected with a discharge pipe connected to the extrusion port, and the outlet end of the discharge pipe is connected to the outer pipe support frame and connected to the inlet of the core pipe. connected.

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

1. The production equipment of this composite pipe is formed into a composite pipe by one-step molding of molten material and continuous reinforcing fiber 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. The strength is higher, and there is no problem that the strength of the pipeline is weakened due to the weak interlayer bonding existing in the composite pipeline produced by the existing equipment.

2. The production equipment of the composite pipe also has the advantages of high production efficiency and short production line layout length, so it can reduce the occupation of workshop space.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of the composite pipe production equipment.

Fig. 2 is a cross-sectional view of the composite pipe production equipment.

FIG. 3 is a partially enlarged view of FIG. 2 .

Fig. 4 is a front view of the composite pipe production equipment.

In the figure, 1. Extruder; 2. Forming mold; 21. Mandrel; 22. Outer mold sleeve; 23. Forming cavity; 24. Splitter; 25. Heating ring; 3. Core tube; 4. Outer tube ;5, annular cavity; 6, outer tube support frame; 7, discharge pipe; 8, winding machine; 9, connecting sleeve; 10, fasteners; 11, mold bracket; 12, roller bracket; 13, roller ; 14. Vacuum calibrating box; 15. Traction machine; 16. Pipe cutting machine.

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 for the reinforced and toughened composite pipe includes an extruder 1, an outer pipe support frame 6, two winding machines 8, a molding die 2, a vacuum calibrating box 14, Tractor 15 and pipe cutter 16. An outer tube 4 is connected between the molding die 2 and the outer tube support frame 6 , and a core tube 3 is coaxially threaded inside the outer tube 4 . An end of the outer tube 4 away from the molding die 2 and an inlet end of the core tube 3 are connected to the outer tube support frame 6 . The extruder 1 is connected with the discharge pipe 7 that is communicated with its extrusion port, and the outlet end of the discharge pipe 7 is connected on the outer tube support frame 6 and communicates with the entrance of the core pipe 3. At this time, the core pipe 3 and the extruder The extruder 1 is connected, so that the molten material extruded by the extruder 1 can enter the core tube 3 , and the molten material flowing out of the core tube 3 will eventually enter the molding cavity 23 of the molding die 2 .

As shown in Figure 3, the molding die 2 includes an outer mold cover 22, a mandrel 21, and a flow divider 24. The outer wall of the outer mold cover 22 is also provided with a plurality of annular heating rings 26, and each heating ring 26 is arranged along the outer wall of the outer mold cover. 22 are arranged in sequence in the axial direction. The outlet end of the core tube 3 is also fixedly provided with a connecting sleeve 9 , the outer peripheral wall of the connecting sleeve 9 abuts against the inner peripheral wall of the outer tube 4 , and the flow divider 24 is fixedly connected to the connecting sleeve 9 through the fastener 10 . The flow divider 24 is connected to the front end of the core mold 21, and a molding cavity 23 is formed between the core mold 21 and the outer mold casing 22. The function of the molding cavity 23 is to make the pipe protrude from the molding mold 2 with a desired cross-sectional shape. The outlet end of the core tube 3 protrudes into the molding die 2 and communicates with the molding cavity 23 of the molding die 2 , and the outlet end of the core tube 3 is facing the flow divider 24 . One end of the outer tube 4 also extends into the outer mold casing 22 and is coaxially arranged with the outer mold casing 22, and an annular cavity for reinforcing fibers to pass is formed between the outer peripheral wall of the outer tube 4 and the inner peripheral wall of the outer mold casing 22 5. The forming cavity 23 of the annular cavity 5 is facing directly, so that the reinforcing fiber layer on the peripheral wall of the outer tube 4 can pass through the forming cavity 23 .

As shown in Fig. 1 and Fig. 2, the production equipment also includes a mold support 11 for supporting and fixing the outer mold sleeve 22 and a roller support 12 positioned at the side of the mold support 11, and the mold support 11 can move along the axial direction of the outer tube 4. Move back and forth, and the core mold 21 can be detached from the outer mold casing 22 after the mold support 11 moves away from the outer tube 4 . The roller bracket 12 is provided with a roller 13 located below the outer tube 4 , and the roller 13 can roll and support the reinforcing fibers on the outer peripheral wall of the outer tube 4 . The roller support 12 and the roller 13 are not shown in FIG. 1 .

As shown in FIGS. 1 and 2 , two winding machines 8 are sequentially arranged along the axial direction of the outer tube 4 . Coil winding machine 8 is prior art, can directly buy and obtain on the market. Of course, in the actual manufacturing process, the axial yarn feeding structure in the prior art can also be installed, and the outer circumference of the outer tube 4 will be coated with a number of continuous reinforcing fibers arranged in the axial direction of the outer tube 4 by using the axial yarn feeding structure The axial fiber layer is formed on the wall, and the winding machine 8 winds the continuous reinforcing fiber circumferentially on the outside of the axial fiber layer.

When the production equipment of the reinforced and toughened composite pipe is manufactured, the extruder 1 extrudes molten material such as PE, enters the core pipe 3 and flows into the molding die 2 . At the same time, under the action of the tractor, the reinforcing fibers coated on the outer peripheral wall of the outer tube 4 continue to enter the forming mold 2, and combine with the molten material flowing out of the core tube 3 in the forming cavity 23, and then form a fiber-reinforced fiber. The composite pipe extends from the outlet end of the forming cavity 23, and then passes through the sizing sleeve, the sizing cooling of the vacuum calibrating box 14, and the traction of the tractor 15. The composite pipe coming out of the tractor 15 can pass through the pipe cutting machine. 16 Cut to form the pipe to the desired length.

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 a lot of 1, extruder; 2, forming mold; 21, mandrel; 22, outer mold sleeve; 23, forming cavity; 24, splitter; 25, heating ring; 3, core tube; 4. Outer pipe; 5. Annular cavity; 6. Outer pipe support frame; 7. Discharge pipe; 8. Winding machine; 9. Connecting sleeve; 10. Fastener; 11. Mold bracket; 12. Roller bracket ;13, roller; 14, vacuum calibrator; 15, tractor; 16, pipe cutting machine 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 (10)

A production device for reinforced and toughened composite pipes, comprising an extruder (1) and a forming die (2), wherein a forming mold is formed between a core die (21) and an outer die sleeve (22) of the forming die (2). Lumen (23), characterized in that the production equipment also includes a core tube (3) communicated with the extruder (1), an outer tube (4) that is sleeved outside the core tube (3) and a reinforcing fiber A winding machine (8) coated on the outer peripheral wall of the outer tube (4), the outlet end of the core tube (3) extends into the molding die (2) and is connected to the molding cavity (23) of the molding die (2) In communication, one end of the outer tube (4) is connected to the molding die (2) and the reinforcing fiber layer on the peripheral wall of the outer tube (4) can pass through the molding cavity (23). The production equipment of reinforced and toughened composite pipe according to claim 1, characterized in that, one end of the outer pipe (4) extends into the outer mold casing (22) and is arranged concentrically with the outer mold casing (22) , An annular cavity (5) facing the molding cavity (23) is formed between the outer peripheral wall of the outer tube (4) and the inner peripheral wall of the outer mold casing (22). The production equipment of reinforced and toughened composite pipe according to claim 1, characterized in that, a flow divider (24) is also arranged in the outer mold casing (22), and the flow divider (24) is connected to the mandrel ( 21), the outlet end of the core pipe (3) is facing the flow divider (24). The production equipment of reinforced and toughened composite pipe according to claim 3, characterized in that, the outlet end of the core pipe (3) is also fixedly provided with a connecting sleeve (9), and the outer circumference of the connecting sleeve (9) The wall is against the inner peripheral wall of the outer pipe (4), and the flow divider (24) is fixedly connected to the connecting sleeve (9) through a fastener (10). The production equipment for reinforced and toughened composite pipe according to claim 1, 2 or 3, characterized in that, the production equipment also includes a mold support (11) for supporting and fixing the outer mold sleeve (22), said mold support (11) can move back and forth along the axial direction of the outer tube (4), and the mandrel (21) can be deviated from the outer mold cover (22) after the mold support (11) moves away from the outer tube (4) direction. The production equipment of reinforced and toughened composite pipe according to claim 1, 2 or 3, characterized in that the production equipment also includes an outer pipe support frame (6), the other end of the outer pipe (4) and the core pipe The inlet ends of (3) are all connected on the outer tube support frame (6). The production equipment for reinforced and toughened composite pipe according to claim 5, characterized in that, the production equipment also includes a roller bracket (12) located at the side of the mold bracket (11), and the roller bracket (12) is provided with A roller (13) located under the outer tube (4), the roller (13) can provide rolling support for the reinforcement fibers on the outer peripheral wall of the outer tube (4). The production equipment of reinforced and toughened composite pipe according to claim 1, 2 or 3, characterized in that, the number of the winding machines (8) is two, and the two winding machines (8) are along the outer pipe ( 4) The axial directions are arranged in sequence. The production equipment of reinforced and toughened composite pipe according to claim 6, characterized in that, the extruder (1) is connected with a discharge pipe (7) communicated with its extrusion port, and the discharge pipe ( 7) The outlet end is connected to the outer tube support frame (6) and communicates with the inlet end of the core tube (3). The production equipment for reinforced and toughened composite pipe according to claim 1, 2 or 3, characterized in that, the outer wall of the outer mold casing (22) is also provided with a plurality of annular heating rings (26), each The heating rings (26) are sequentially arranged along the axial direction of the outer mold casing (22).

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