Multi-layer composite forming die for continuous glass fiber reinforced thermoplastic pipe
By designing a multi-layer composite mold of continuous glass fiber reinforced thermoplastic tube, the mandrel and guide plate are used to achieve one-time molding, which solves the problems of multiple extrusions and high energy consumption in the prior art, and successfully prepares the thinner wall thickness glass fiber reinforced thermoplastic pipes and reduce energy consumption.
Patent Information
- Application Number
- CN202421096423.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-20
- Publication Date
- 2025-01-07
- Estimated Expiration
- 2034-05-20
AI Technical Summary
The forming process of existing glass fiber reinforced thermoplastic pipes requires two extrusion processes, which has high energy consumption and thick molding thickness, and the energy consumption of the three-layer coextrusion mold is also high when melted.
Design a multi-layer composite mold of continuous glass fiber reinforced thermoplastic pipe. Through the inner layer tube, intermediate reinforcement layer and outer layer tube distributed in sequence from the inside to the outside, the molding channel and guide plate on the mandrel can be used to achieve one-time extrusion. Form the inner layer pipe, intermediate reinforcement layer and outer layer pipe to reduce the extrusion process and reduce energy consumption.
The molding of continuous glass fiber reinforced thermoplastic pipes with thin wall thickness is achieved, reducing the extrusion process and energy consumption, and ensuring the molding quality through the guide and heating sleeve of glass fiber reinforced belt.
Smart Images
Figure CN222309768U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of glass fiber thermoplastic pipe composites, in particular to a continuous glass fiber reinforced thermoplastic pipe multilayer composite forming die. Background Art
[0002] Glass fiber reinforced molded plastic composite pipe is a composite pipe made of plastic as the main body and glass fiber as the reinforcement layer. Due to the addition of glass fiber, the composite pipe has excellent strength and rigidity, and can withstand greater pressure and weight. This kind of pipe is widely used in various engineering fields due to its excellent performance.
[0003] At present, glass fiber reinforced composite pipes are mostly designed with an inner pipe, a glass fiber reinforced winding layer and an outer pipe, and the inner pipe and the outer pipe are mostly thermoplastic plastics, so glass fiber reinforced composite pipes are also called glass fiber reinforced thermoplastic pipes. Existing glass fiber reinforced thermoplastic pipes are usually processed by extrusion molding or extrusion + winding.
[0004] For example, the patent cN209971463U mentions a molding structure of the inner layer film of a thermoplastic glass fiber reinforced tube, which includes a mold core, a glass fiber reinforced tube, an air inlet pipe, an extruder head, an extrusion die, an extrusion core mold, a thin-walled tube, a shaping mold and a negative pressure tube; the glass fiber reinforced tube is sleeved on the outer periphery of the mold core, the thin-walled tube is sleeved in the glass fiber reinforced tube and abuts against the inner wall of the glass fiber reinforced tube, the shaping mold is sleeved in the thin-walled tube and abuts against the inner wall of the thin-walled tube; one end of the air inlet pipe extends into the thin-walled tube, and the other end of the air inlet pipe is used for an external air source; one end of the negative pressure tube extends into the glass fiber reinforced tube, and the other end of the negative pressure tube is used for an external vacuum source; the extrusion core mold extends into the thin-walled tube.
[0005] The molding structure in the above patent adopts the method of extrusion blow molding. In this method, it is necessary to first mold a glass fiber reinforced tube, then mold an inner tube on the inner wall of the glass fiber reinforced tube, and finally mold an outer tube on the outer wall of the glass fiber reinforced tube. That is, the entire molding process requires two extrusion steps, which is very troublesome and energy-intensive.
[0006] Another example is a three-layer co-extrusion mold for preparing glass fiber reinforced pipes mentioned in patent CN115284575A, and a three-layer co-extrusion mold for HDPE mentioned in patent CN206066902U. In the above two patents, although three-layer co-extrusion is used to achieve one-time molding, when this molding mold is molding, all three layers of materials need to be molten materials, the thickness of the final molded pipe will be relatively thick, and all three materials need to be melted, and the relative energy consumption is also relatively high. Utility Model Content
[0007] The technical problem to be solved by the utility model is to provide a continuous glass fiber reinforced thermoplastic pipe multilayer composite forming die, which can form a continuous glass fiber reinforced thermoplastic pipe with a thinner wall thickness at one time.
[0008] In order to solve the above technical problems, the technical solution of the utility model is: a continuous glass fiber reinforced thermoplastic tube multi-layer composite molding mold, the continuous glass fiber reinforced thermoplastic tube includes an inner tube, an intermediate reinforcement layer and an outer tube distributed in sequence from the inside to the outside, the intermediate reinforcement layer includes at least one glass fiber tape layer, the glass fiber tape layer is composed of at least two glass fiber reinforced tapes, each glass fiber reinforced tape of the same glass fiber tape layer is distributed on the circumferential outer wall of the inner tube along the circumferential direction of the thermoplastic tube, and each of the glass fiber reinforced tapes extends along the axial direction of the thermoplastic tube, and its innovation lies in: the multi-layer composite molding structure includes
[0009] A mandrel having an axial head on one side of the mandrel in the long axis direction, a ring-shaped inner tube forming channel in the mandrel, an inner glue injection port connected to the inner tube forming channel is also provided on the side of the mandrel away from the axial head, a ring-shaped outer tube forming channel is provided on the axial head outside the inner tube forming channel, and an outer glue injection port connected to the outer tube forming channel is also provided on the axial head;
[0010] A first guide plate and a second guide plate are sequentially mounted on the outer wall of the core shaft along the long axis direction of the core shaft, and the first guide plate, the second guide plate and the shaft head are sequentially distributed, through holes for allowing the glass fiber reinforced tape to pass through are opened on the first guide plate and the second guide plate, and a strip channel for allowing the glass fiber reinforced tape to pass through is also opened in the shaft head, and on the side of the core shaft close to the shaft head, the inner tube forming channel, the outer tube forming channel and the strip channel are interconnected.
[0011] Further, the through hole on the first guide plate is defined as a first through hole, and the through hole on the second guide plate is defined as a second through hole;
[0012] The first guide plate is provided with a plurality of first through hole groups distributed along the circumferential direction of the core shaft, each first through hole group is composed of a plurality of first through holes distributed along the radial direction of the core shaft, and the first through holes are in an arc shape;
[0013] The second guide plate is provided with an array of second through hole groups distributed in sequence along the radial direction of the core shaft, each group of second through hole groups is composed of several second through holes distributed along the circumferential direction of the core shaft, and the number of second through holes is consistent with the number of first through holes, the second through holes are also arc-shaped, and the diameter of the circle where the second through holes are located is smaller than the diameter of the circle where the first through holes are located, and the second through holes in the two adjacent groups of second through hole groups are staggered with each other.
[0014] Furthermore, a side of the strip channel close to the second guide plate is in a trumpet shape.
[0015] Furthermore, a first heating sleeve is mounted on the outer wall of the core shaft between the first guide plate and the second guide plate, a second heating sleeve is mounted on the outer wall of the shaft head away from the second guide plate, and a third heating sleeve is arranged on the inner wall of the core shaft on the shaft head side.
[0016] The advantages of the utility model are: through the cooperation of the three molding channels on the core shaft and the through holes on the first guide plate and the second guide plate, the required inner layer tube, middle reinforcement layer and outer layer tube can be directly molded by one extrusion, which greatly reduces the extrusion process and the corresponding energy consumption; in addition, through the multi-layer composite molding structure of the utility model, when extrusion molding is carried out, the main load is borne by the glass fiber reinforced tape, so the inner layer tube and the outer layer tube can be directly made thin, so that a continuous glass fiber reinforced thermoplastic tube with a thinner wall thickness can be prepared.
[0017] The design of the first guide plate and the second guide plate is to guide and straighten the glass fiber reinforced tape to avoid interlacing and mutual interference between the pieces of glass fiber reinforced tape, thereby ensuring the smooth feeding of the glass fiber reinforced tape; and the diameter of the circle where the second through hole is located is designed to be smaller than the diameter of the circle where the first through hole is located, so that the glass fiber reinforced tape can gradually form an arc shape that fits the inner layer tube better after passing through the two through holes, which is convenient for molding.
[0018] The side of the strip channel close to the second guide plate is designed as a bell mouth, that is, the feed port of the strip channel adopts a bell mouth design, so that each piece of glass fiber reinforced tape can enter more smoothly. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a schematic diagram of the continuous glass fiber reinforced thermoplastic pipe multi-layer composite molding die of the utility model.
[0020] Figure 2 for Figure 1 A magnified schematic diagram of part A.
[0021] Figure 3 It is a schematic diagram of the first guide plate in the utility model.
[0022] Figure 4 It is a schematic diagram of the second guide plate in the present invention.
[0023] Figure 5 Schematic diagram of continuous glass fiber reinforced thermoplastic tube.
[0024] Figure 6 Schematic diagram of the distribution of glass fiber reinforced tapes in continuous glass fiber reinforced thermoplastic pipes. DETAILED DESCRIPTION
[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the specific implementation method, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.
[0026] like Figure 5 , Figure 6 The continuous glass fiber reinforced thermoplastic pipe shown in the figure comprises an inner layer pipe 1, an intermediate reinforcement layer 2 and an outer layer pipe 3 which are sequentially arranged from the inside to the outside. The inner layer pipe 1 and the outer layer pipe 3 are both HDPE pipes. The intermediate reinforcement layer 2 comprises seven glass fiber tape layers, each of which is sequentially coaxially arranged on the circumferential outer wall of the inner layer pipe 1 from the inside to the outside. Each glass fiber tape layer is composed of four glass fiber reinforced tapes 21. Each glass fiber reinforced tape 21 of the same glass fiber tape layer is distributed on the circumferential outer wall of the inner layer pipe 1 along the circumferential direction of the pipe. On, each glass fiber reinforced tape 21 extends along the axial direction of the pipe, the cross section of a single glass fiber reinforced tape 21 is arc-shaped, a gap 22 is left between each glass fiber reinforced tape 21 of the same glass fiber tape layer, and each glass fiber reinforced tape 21 located in the outer glass fiber tape layer and each glass fiber reinforced tape 21 located in the inner glass fiber tape layer are staggered, and the glass fiber reinforced tape 21 located in the outer layer covers the gap 22 between adjacent glass fiber reinforced tapes 21 located in the inner glass fiber tape layer.
[0027] like Figure 1-Figure 4 A continuous glass fiber reinforced thermoplastic pipe multilayer composite molding die is shown, comprising
[0028] The core shaft 4 is horizontally installed on a core shaft bracket 5. The core shaft 4 is a hollow cylindrical structure with openings on both sides. A shaft head 6 is provided on one side of the long axis direction of the core shaft 4. A ring-shaped inner tube forming channel 41 is provided inside the core shaft 4. The inner tube forming channel 41 extends along the long axis direction of the core shaft 4, and the side of the inner tube forming channel 41 close to the shaft head 6 directly extends out of the core shaft 4. An inner glue injection port 42 connected to the inner tube forming channel 41 is also provided on the side of the core shaft 4 away from the shaft head 6.
[0029] On the shaft head 6, there is a ring-shaped outer tube forming channel 61 located outside the inner tube forming channel 41. The outer tube forming channel 61 extends along the long axis direction of the shaft 4. Similarly, the outer tube forming channel 61 directly extends out of the shaft head 6. The shaft head 6 is also provided with an external glue injection port 62 connected to the outer tube forming channel 61.
[0030] A first guide plate 7 and a second guide plate 8 are sequentially mounted on the outer wall of the mandrel 4 along the long axis direction of the mandrel 4, and the first guide plate 7, the second guide plate 8 and the shaft head 6 are sequentially distributed, and through holes for allowing the glass fiber reinforced tape 21 to pass through are opened on the first guide plate 7 and the second guide plate 8, and a strip channel 63 for allowing the glass fiber reinforced tape 21 to pass through is also opened in the shaft head 6, and the strip channel 63 horizontally runs through the entire shaft head 6, and on the side of the mandrel 4 close to the shaft head 6, the inner tube forming channel 41, the outer tube forming channel 61 and the strip channel 63 are connected to each other, such as Figure 2 shown.
[0031] The side of the strip channel 63 close to the second guide plate 8 is in a bell-mouth shape. The side of the strip channel 63 close to the second guide plate 8 is designed as a bell-mouth, that is, the feeding port of the strip channel 63 adopts a bell-mouth design, so that each glass fiber reinforced tape 21 can enter more smoothly.
[0032] The through hole on the first guide plate 7 is defined as a first through hole 71 , and the through hole on the second guide plate 8 is defined as a second through hole 81 .
[0033] like Figure 3 As can be seen from the schematic diagram shown, the first guide plate 7 is a square plate, and eight groups of first through holes distributed along the circumferential direction of the core shaft 4 are opened on the first guide plate 7, of which four groups of first through holes are composed of three first through holes 71 distributed along the radial direction of the core shaft 4, and the remaining four groups of first through holes are composed of four first through holes 71 distributed along the radial direction of the core shaft 4, and the first through hole group consisting of three first through holes 71 and the first through hole group consisting of four first through holes 71 are spaced apart from each other, and the first through holes 71 are in the shape of an arc.
[0034] like Figure 4As can be seen from the schematic diagram shown, the second guide plate 8 is also a square plate, and seven groups of second through holes are opened on the second guide plate 8 and are distributed in sequence along the radial direction of the core shaft 4. Each group of second through holes is composed of four second through holes 81 distributed along the circumferential direction of the core shaft 4, and the number of second through holes 81 is consistent with the number of first through holes 71. The second through holes 81 are also arc-shaped, and the diameter of the circle where the second through holes 81 are located is smaller than the diameter of the circle where the first through holes 71 are located. The second through holes 81 in two adjacent groups of second through holes are staggered with each other. By cooperating with the designed first guide plate 7 and the second guide plate 8, the glass fiber reinforced tape 21 in the feeding is guided and straightened to avoid the phenomenon of interlacing and mutual interference between the glass fiber reinforced tapes 21, thereby ensuring the smooth feeding of the glass fiber reinforced tape 21; and the first through hole 71 and the second through hole 81 are both designed to be arc-shaped, and the diameter of the circle where the second through hole 81 is located is designed to be smaller than the diameter of the circle where the first through hole 71 is located, so that the glass fiber reinforced tape 21 can gradually form an arc shape that is more in line with the inner layer tube 1 after passing through the two through holes, so as to facilitate the overall molding.
[0035] During subsequent molding, the area where the core shaft 4 is located between the first guide plate 7 and the second guide plate 8 will be designed as a heating zone, and a heating oven or the like can be used to preheat the passing glass fiber reinforced tape 21 so that the glass fiber reinforced tape 21 can be better composite molded with the inner layer tube 1 and the outer layer tube 3.
[0036] A first heating sleeve 43 is also mounted on the outer wall of the mandrel 4 between the first guide plate 7 and the second guide plate 8, a second heating sleeve 64 is also mounted on the outer wall of the shaft head 6 away from the second guide plate 8, and a third heating sleeve 44 is also arranged on the inner wall of the mandrel 4 on the side of the shaft head 6. The heating sleeve is arranged to heat and insulate the inner tube forming channel 41 and the outer tube forming channel 61 in the mandrel 4 and the shaft head 6, and provide a good temperature basis for better forming of the inner tube 1 and the outer tube 3.
[0037] When forming the continuous glass fiber reinforced thermoplastic tube, first, prepare the glass fiber reinforced tape 21 and the gelatinous HDPE raw material required for forming, then pass each piece of the full-length glass fiber reinforced tape 21 through the first through hole 71 on the first guide plate 7, then through the second through hole 81 on the second guide plate 8, and then enter the tape channel 63 from the bell mouth of the tape channel 63, and finally extend from the other side of the tape channel 63. At the same time, the gelatinous HDPE raw material is injected from the inner injection port 42 and the outer injection port 62 respectively. In the inner tube forming channel 41 and the outer tube forming channel 61, the required inner tube 1 and outer tube 3 are extruded and formed on the inner and outer sides of the glass fiber reinforced tape 21 at the connection points between the inner tube forming channel 41, the outer tube forming channel 61 and the tape channel 63 by heating, and each piece of glass fiber reinforced tape 21 is compounded into an intermediate reinforcement layer 2. At the same time as the forming, a traction machine is also provided on the side of the core shaft 4 located at the shaft head 6 to traction the glass fiber reinforced tape 21, and finally the required continuous glass fiber reinforced thermoplastic tube is formed by pultrusion.
[0038] Through the above-mentioned molding method, the required inner tube 1, middle reinforcement layer 2 and outer tube 3 can be directly molded by extrusion once, which greatly reduces the extrusion process. Since the raw materials need to be heated and kept warm during extrusion molding, when the extrusion process is reduced, the relative energy consumption is also reduced. In addition, through the multi-layer composite molding structure of the utility model, when extrusion molding is performed, the main load is borne by the glass fiber reinforced tape 21, so the inner tube 1 and the outer tube 2 can be directly made thin, so that a continuous glass fiber reinforced thermoplastic tube with a thinner wall thickness can be prepared.
[0039] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.
Claims
1. A continuous glass fiber reinforced thermoplastic tube multilayer composite molding die, the continuous glass fiber reinforced thermoplastic tube comprises an inner tube, an intermediate reinforcement layer and an outer tube which are sequentially arranged from the inside to the outside, the intermediate reinforcement layer comprises at least one glass fiber tape layer, the glass fiber tape layer is composed of at least two glass fiber reinforced tapes, each glass fiber reinforced tape of the same glass fiber tape layer is distributed on the circumferential outer wall of the inner tube along the circumferential direction of the thermoplastic tube, and each of the glass fiber reinforced tapes extends along the axial direction of the thermoplastic tube, characterized in that: Multi-layer composite molding structure includes A mandrel having an axial head on one side of the mandrel in the long axis direction, a ring-shaped inner tube forming channel in the mandrel, an inner glue injection port connected to the inner tube forming channel is also provided on the side of the mandrel away from the axial head, a ring-shaped outer tube forming channel is provided on the axial head outside the inner tube forming channel, and an outer glue injection port connected to the outer tube forming channel is also provided on the axial head; A first guide plate and a second guide plate are sequentially mounted on the outer wall of the core shaft along the long axis direction of the core shaft, and the first guide plate, the second guide plate and the shaft head are sequentially distributed, through holes for allowing the glass fiber reinforced tape to pass through are opened on the first guide plate and the second guide plate, and a strip channel for allowing the glass fiber reinforced tape to pass through is also opened in the shaft head, and on the side of the core shaft close to the shaft head, the inner tube forming channel, the outer tube forming channel and the strip channel are interconnected.
2. The continuous glass fiber reinforced thermoplastic pipe multi-layer composite molding die according to claim 1, characterized in that: Define the through hole on the first guide plate as a first through hole, and the through hole on the second guide plate as a second through hole; The first guide plate is provided with a plurality of first through hole groups distributed along the circumferential direction of the core shaft, each first through hole group is composed of a plurality of first through holes distributed along the radial direction of the core shaft, and the first through holes are in an arc shape; The second guide plate is provided with an array of second through hole groups distributed in sequence along the radial direction of the core shaft, each group of second through hole groups is composed of several second through holes distributed along the circumferential direction of the core shaft, and the number of second through holes is consistent with the number of first through holes, the second through holes are also arc-shaped, and the diameter of the circle where the second through holes are located is smaller than the diameter of the circle where the first through holes are located, and the second through holes in the two adjacent groups of second through hole groups are staggered with each other.
3. The continuous glass fiber reinforced thermoplastic pipe multi-layer composite molding die according to claim 1, characterized in that: The side of the strip passage close to the second guide plate is in a trumpet shape.
4. The continuous glass fiber reinforced thermoplastic pipe multi-layer composite molding die according to claim 1, characterized in that: A first heating sleeve is mounted on the outer wall of the mandrel between the first guide plate and the second guide plate, a second heating sleeve is mounted on the outer wall of the shaft head away from the second guide plate, and a third heating sleeve is mounted on the inner wall of the mandrel on the shaft head side.