Sheet extrusion die and system, equipment for vertical roll forming of reinforcing belt and reinforcing belt production line

Abstract

The utility model relates to the field of production equipment of pipeline reinforcing belts, and discloses a sheet extrusion die, a sheet extrusion system, equipment for vertical rolling forming of reinforcing belts and a reinforcing belt production line. A wire passing channel (732) through which a plurality of columns of reinforced wires (100) running side by side pass, and a first mold inner runner (733) and a second mold inner runner (734) which are symmetrically distributed on the two sides of the wire passing channel (732) are arranged in the mold main body (731); and molten plastic sheets (200) can be simultaneously conveyed through the first mold inner runner (733) and the second mold inner runner (734) and are respectively extruded on the two sides of the reinforced wire (100) which runs side by side. The sheet extrusion die can be used in a sheet extrusion system of a reinforced belt production line, the equipment cost and the control difficulty can be effectively reduced conveniently, and meanwhile the product quality of a manufactured reinforced belt is guaranteed.

Description

Technical Field

[0001] This utility model relates to production equipment for pipe reinforcement strips, specifically to a sheet extrusion die and a sheet extrusion system including the sheet extrusion die. Furthermore, this utility model also relates to equipment for vertical roll forming of reinforcement strips including the sheet extrusion system, and a reinforcement strip production line. Background Technology

[0002] To improve the mechanical properties of pipelines, it is typically necessary to use a winding machine to wind reinforcing materials such as steel cord, steel fiber tape, and fiber tape onto a plastic core tube to form a composite pipe. To ensure good reinforcement and composite effect with the plastic core tube, the reinforcing strip used in the production of such composite pipes usually consists of multiple strands of reinforcing filaments (such as steel cord, steel fiber, and steel wire) and a plastic coating, formed into a flat strip, which is then thermally bonded to the outer circumference of the plastic core tube through a spiral winding process.

[0003] The quality of the reinforcing tape has a significant impact on the performance of composite pipes using it. In traditional technology, the reinforcing tape can be manufactured on a production line equipped with a tape-making die. This die may have a vacuum chamber and a composite chamber. After being combed and heat-treated, the reinforcing filaments pass through these chambers sequentially, eventually bonding with molten plastic in the composite chamber to form the reinforcing tape. By having the reinforcing filaments pass through the vacuum chamber, air bubbles in the resulting tape can be effectively avoided, and the bonding density between the reinforcing filaments and the plastic can be strengthened. However, because the reinforcing filaments need to pass through the mandrel holes in the die to enter the vacuum and composite chambers, this die-making process and manufacturing method suffer from problems such as easy wear of the anti-corrosion layer on the surface of the reinforcing filaments and the mandrel holes, making it difficult to guarantee product quality and production efficiency.

[0004] In response, Chinese invention patent application CN118744515A discloses a vertical roll forming equipment and a reinforced belt production line. For example... Figures 1 to 4 As shown, the reinforced tape production line includes a wire feeding and combing system, a vertical roll forming machine 106, a cooling and shaping device for the reinforced tape 300, traction, cutting, and winding equipment, etc. Specifically, the wire feeding system can be configured as a wire feeding frame 101, which can feed multiple strands of reinforcing filament 100, such as steel cord, steel fiber, steel wire, etc. For this purpose, the wire feeding frame 101 can have multiple wire spindles 101a, each wound with reinforcing filament 100, to release multiple strands of reinforcing filament 100 (monofilaments). When the reinforcing filament 100 on the wire spindle 101a is exhausted, a new wire spindle 101a can be replaced, or, according to production needs, wire spindles 101a with different reinforcing filament 100 can be replaced as a whole.

[0005] The unwound reinforcing filaments 100 need to be combed into a predetermined arrangement, allowing them to pass through a filament collector 102, a guide roller 103, a leveling roller 104, and a filament comb 105. The filament collector 102 gathers the multiple strands of reinforcing filaments 100 (monofilaments) unwound from the pay-off frame 101 into a bundle. The filament comb 105 then separates these reinforcing filaments 100 into multiple parallel rows, so that they can be combined with the extruded molten plastic sheet 200 to form a reinforcing belt 300 when subsequently passed through the vertical roll forming equipment 106. To ensure that the reinforcing filaments 100 are arranged at predetermined intervals on the same plane, leveling rollers 104 are provided before and after the filament comb 105 to support the reinforcing filaments 100, and the height position of the reinforcing filaments 100 as they pass through the filament comb 105 is constrained by the guide roller 103 and the first deflecting roller 61a.

[0006] The reinforcing filament 100 is then heat-treated and bonded to the extruded molten plastic sheet 200 in a vertical roll forming apparatus 106 to form a reinforcing strip 300. The reinforcing strip 300 formed by the vertical roll forming apparatus 106 has a high temperature and therefore needs to be further cooled and shaped.

[0007] For this purpose, the reinforcing strip 300 output from the vertical roll forming machine 106 can be switched to run horizontally by the pressure roller device 107, and then thoroughly cooled and shaped by a cooling device such as a water cooling tank 108. Then, the reinforcing strip 300 is pulled backward by the traction machine 110, and multiple air knives or other drying devices 109 can be provided downstream of the water cooling tank 108 to dry the surface moisture of the reinforcing strip 300. Finally, the reinforcing strip 300 can be wound into a roll by the winding machine 112, and the reinforcing strip 300 can be cut in time by the reinforcing strip cutting device 111 according to the winding specifications.

[0008] This reinforced belt production line uses a vertical roll forming machine 106 (i.e., a machine for vertically roll forming reinforced belts) to achieve a roll forming process different from the aforementioned traditional technologies, such as... Figure 3As shown, the vertical roll forming equipment 106 includes a sheet extrusion system 70 and at least one set of roll forming composite rollers (a first set of roll forming composite rollers 67a, a second set of roll forming composite rollers 67b, and a third set of roll forming composite rollers 67c). The sheet extrusion system 70 has sheet extrusion dies 73 disposed opposite to both sides of the reinforcing filaments 100, so as to be able to extrude molten plastic sheets 200 on both sides of multiple rows of reinforcing filaments 100 running side by side. The roll forming composite rollers include rollers 671 disposed below the sheet extrusion die 73 and arranged in pairs at intervals, thereby extruding molten plastic sheets 200 above the roll forming composite rollers. The molten plastic sheet 200 and the reinforcing filaments 100 therebetween are simultaneously fed into the space between the paired rollers 671, so that the rollers 671 can roll the opposite sides of the molten plastic sheet 200, so that the molten plastic sheets 200 extruded from both sides are bonded together, and the multiple rows of reinforcing filaments 100 running side by side are fixed therebetween to form a reinforcing belt 300.

[0009] Among them, combined Figure 3 and Figure 4 As shown, the sheet extrusion system 70 of the vertical roll forming equipment 106 uses two independent extruders 71 to supply molten plastic to two independent sheet extrusion dies 73 arranged on both sides of the reinforcing filament 100 through corresponding extrusion channels 74. This results in high equipment costs and complex control requirements. In addition, the sheet extrusion dies 73 need to be precisely arranged so that the molten plastic sheets extruded from the reinforcing filament are symmetrically distributed and run. If their relative arrangement is deviated, it is easy to cause the quality of the resulting reinforcing strip to be substandard. Utility Model Content

[0010] The purpose of this invention is to overcome the problems of high equipment cost and complex control requirements of the sheet extrusion system used in the existing reinforced belt production line, and to provide a sheet extrusion die that can be used in the sheet extrusion system of the reinforced belt production line, and can effectively reduce equipment cost and control difficulty, while ensuring the product quality of the reinforced belt.

[0011] To achieve the above objectives, this utility model provides a sheet extrusion die, including a die body. The die body has a filament passage for multiple rows of reinforcing filaments running side by side to pass through, and a first die inner flow channel and a second die inner flow channel symmetrically distributed on both sides of the filament passage, so that molten plastic sheets can be extruded on both sides of the reinforcing filaments running side by side through the first die inner flow channel and the second die inner flow channel.

[0012] Preferably, along the arrangement direction perpendicular to the reinforcing filaments, an inner heating plate is connected to the side of the mold body facing the filament passage, and / or, an outer heating plate is connected to the outside of the mold body away from the filament passage.

[0013] More preferably, the spacing between the inner heating plates, which are arranged opposite to each other at intervals, is 5mm-100mm.

[0014] Preferably, the mold body includes a first mold body and a second mold body that are spaced apart from each other and connected to each other as a whole, the wire passage is located between the first mold body and the second mold body, the flow channel inside the first mold body is disposed in the first mold body, and the flow channel inside the second mold body is disposed in the second mold body.

[0015] Preferably, the mold body includes a mold side plate that is connected to both sides of the first mold body and the second mold body along the arrangement direction of the reinforcing filaments and connects the first mold body and the second mold body into one unit.

[0016] Preferably, the first mold body and the second mold body each include a left half mold and a right half mold that are sealed to each other, and the flow channels inside the first mold and the second mold are respectively formed on the surfaces of the left half mold and the right half mold that are opposite to each other.

[0017] More preferably, in the first mold body and the second mold body, the left half mold or the right half mold has a half mold body, an elastic connecting part and a sheet thickness adjustment part. An adjustment element is connected to the half mold body. The adjustment element can be adjusted to drive the sheet thickness adjustment part to move relative to the half mold body by causing the elastic connecting part to elastically deform, so as to change the thickness of the extruded molten plastic sheet.

[0018] A second aspect of this utility model provides a sheet extrusion system, characterized in that it includes an extruder, the aforementioned sheet extrusion die, and a flow distribution module for synchronously distributing the material flow extruded by the extruder to the first and second flow channels within the sheet extrusion die.

[0019] A third aspect of this utility model provides a vertical roll forming apparatus for reinforcing belts, comprising:

[0020] The aforementioned sheet extrusion system; and,

[0021] At least one set of roll forming composite rollers, the roll forming composite rollers comprising rollers arranged in pairs and spaced apart from each other below the sheet extrusion die, the pairs of rollers defining a roll forming gap for receiving the reinforcing filaments running from top to bottom and the molten plastic sheets extruded on both sides thereon, and capable of bonding multiple rows of reinforcing filaments running side by side with the molten plastic sheets on both sides of the molten plastic sheets by roll forming a reinforcing strip.

[0022] A fourth aspect of this utility model provides a reinforced belt production line including the above-described vertical roll forming equipment for reinforced belts.

[0023] Through the above technical solution, this utility model forms a first and a second internal flow channel within the die body of the sheet extrusion die, capable of separately conveying and extruding molten plastic sheets onto both sides of the parallel-running reinforcing filaments. This allows for the use of a single extruder to supply molten plastic and facilitates the simultaneous extrusion of molten plastic with identical temperature and composition on both sides of the reinforcing filaments, effectively reducing equipment costs and control complexity. Furthermore, the flow channels through which the reinforcing filaments pass facilitate the determination of the die's installation orientation, ensuring symmetrical extrusion and distribution of the molten plastic sheets on both sides of the reinforcing filaments, thus guaranteeing the quality of the resulting reinforcing strip. Attached Figure Description

[0024] Figure 1 This is a front view of the upstream equipment in a conventional reinforced belt production line, including the yarn feeding, combing system, and vertical roll forming equipment, etc.

[0025] Figure 2 This is a front view of the downstream equipment in a conventional reinforced belt production line, including the reinforcing belt cooling and shaping device, traction, cutting, and winding equipment, etc. The upstream end on the right side of the figure is connected to... Figure 1 The downstream end on the left side of the middle is connected;

[0026] Figure 3 yes Figure 1 A magnified view of a portion of S1 in the middle;

[0027] Figure 4 yes Figure 3 A top view of a neutral roll forming machine, etc.

[0028] Figure 5 This is a front view of a vertical roll forming device for reinforcing belts according to a preferred embodiment of the present invention;

[0029] Figure 6 This is a top view of a sheet extrusion system according to a preferred embodiment of the present invention;

[0030] Figure 7 yes Figure 6 A perspective view of the sheet extrusion die used in the sheet extrusion system shown.

[0031] Figure 8 yes Figure 7 The front view of the sheet extrusion die shown;

[0032] Figure 9 yes Figure 7 Left view of the sheet extrusion die shown;

[0033] Figure 10 yes Figure 7 A top view of the sheet extrusion die shown;

[0034] Figure 11 yes Figure 10 AA cross-sectional view of the sheet extrusion die.

[0035] Explanation of reference numerals in the attached figures

[0036] 101-Payout frame; 101a-Wire spindle; 102-Wire collector; 103-Inlet pressure roller; 104-Smoothing roller; 105-Wire separating comb; 106-Vertical roll forming equipment; 107-Pressure roller device; 108-Water cooling tank; 109-Drying device; 110-Traction machine; 111-Reinforcing belt cutting device; 112-Winding machine;

[0037] 60-Frame; 61a, 61b, 61c-Guiding rollers; 62-Drying oven; 63-Dividing roller; 64-Heating roller; 66-Combing device; 67a, 67b, 67c-Roller press composite roller group; 671-Roller; 68-Gap adjustment mechanism; 69-Air cooling device;

[0038] 70 - Sheet extrusion system; 71 - Extruder; 72 - Diverting module; 721 - Diverting module heating plate; 73 - Sheet extrusion die; 731 - Die body; 731a - Half die body; 731b - Elastic connection part; 731c - Sheet thickness adjustment part; 731d - Die; 7311 - First die body; 7312 - Second die body; 7313 - Die side plate; 732 - Wire passage; 733 - First die inner flow channel; 734 - Second die inner flow channel; 735 - Inner heating plate; 736 - Outer heating plate; 737 - Adjusting element; 738 - Outer flow channel; 7381 - Outer flow channel heating element;

[0039] 100 - Reinforcing filament; 200 - Molten plastic sheet; 300 - Reinforcing tape. Detailed Implementation

[0040] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0041] In this utility model, unless otherwise stated, directional terms such as "up," "down," "left," and "right" generally refer to the up, down, left, and right positions shown with reference to the accompanying drawings; "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself. To facilitate a clear understanding of this utility model, the following will be combined with... Figures 5 to 11 The parts of this utility model that distinguish it from the prior art will be described in detail. However, it should be understood that, for example, the features described in Chinese invention patent application CN118744515A are different. Figure 1 and Figure 2 The other parts of the reinforcing belt production line shown, except for the vertical roll forming equipment 106, are also applicable to the reinforcing belt production line of this utility model. The following description of its composition, arrangement and working process will be omitted.

[0042] like Figure 5 As shown, one aspect of this utility model provides a vertical roll forming apparatus for reinforcing belts (i.e., vertical roll forming apparatus 106), including a sheet extrusion system 70 and at least one set of roll forming composite rollers. The sheet extrusion system 70 has a sheet extrusion die 73 and is configured to extrude molten plastic sheets 200 from both sides of multiple rows of reinforcing filaments 100 running side-by-side. The roll forming composite rollers include rollers 671 arranged in pairs below the sheet extrusion die 73 and spaced apart from each other. The sheet extrusion system 70 extrudes the molten plastic sheets 200 above the roll forming composite rollers. The molten plastic sheets 200 and the reinforcing filaments 100 simultaneously enter between the paired rollers 671, allowing the rollers 671 to roll the opposite sides of the molten plastic sheets 200, bonding the extruded molten plastic sheets 200 together and fixing the multiple rows of reinforcing filaments 100 running side-by-side therebetween, forming a reinforcing belt 300. For this purpose, a roll gap is defined between the paired rollers 671 to form a roll gap for receiving the reinforcing filament 100 and the molten plastic sheets 200 extruded on both sides thereon, the roll gap being no less than the design thickness of the reinforcing strip 300 to be produced.

[0043] The roller gap is configured to receive the reinforcing filament 100 traveling from top to bottom. Correspondingly, the extruded molten plastic sheet 200 also travels from top to bottom as it passes through this roller gap. As a result, the molten plastic sheet 200 extruded from both sides of the reinforcing filament 100 can have relatively good consistency under the action of gravity, which helps to ensure the product quality of the produced reinforcing belt 300.

[0044] The vertical roll forming equipment 106 used in this invention employs a hot-pressing composite process when manufacturing the reinforcing belt. This eliminates the need for a belt-making mold and in-mold composite process used in traditional technologies to define the composite cavity. Molten plastic sheets 200 are extruded from both sides of multiple rows of reinforcing filaments 100 running side-by-side via a sheet extrusion system 70. At least one set of roll forming rollers then rolls the molten plastic sheets 200 to bond them integrally with the reinforcing filaments 100, resulting in the roll forming of the reinforcing belt 300. This process is completely different from traditional technologies. Because the reinforcing filaments do not need to pass through the mandrel holes and the traditional in-mold composite process is eliminated, the problems of difficulty in guaranteeing product quality and production efficiency inherent in existing technologies are avoided.

[0045] In particular, traditional manufacturing processes typically involve running the reinforcing filament horizontally to avoid bending, which would hinder production efficiency and product quality control. This invention provides a vertical roll forming machine 106 employing a novel process, configured so that the reinforcing filament 100 runs from top to bottom at the point of bonding with the molten plastic sheet 200. A roll forming composite roller assembly is used on both sides to roll the molten plastic sheet 200, achieving continuous roll forming of the reinforcing strip. This design better adapts to the material properties during bonding, facilitates control of the tension of the reinforcing filament 100, and extrudes a suitable molten plastic sheet 200 for bonding. This significantly reduces the requirements for bonding process conditions and ensures the quality of the resulting reinforcing strip.

[0046] In this configuration, the paired rollers 671 can be horizontally spaced apart, with their respective roller shafts extending horizontally, while the reinforcing filament 100 enters the roller gap vertically downwards. This ensures that the molten plastic sheets 200 on both sides maintain good consistency under gravity and are uniformly rolled as they pass through the roller gap, guaranteeing the quality of the produced reinforcing strip 300. In other embodiments, the downward running direction of the reinforcing filament 100 can also have a certain angle relative to the vertical direction, as long as it does not cause severe deformation of the extruded molten plastic sheet 200 before it is substantially shaped.

[0047] The vertical roll forming equipment 106 of this invention achieves continuous roll forming of reinforcing strips by roll forming molten plastic sheet 200 using a roll forming composite roller group. It can be equipped with one or more roll forming composite roller groups. In the preferred embodiment shown in the figure, the vertical roll forming equipment 106 has three roll forming composite roller groups arranged along the running direction of the reinforcing filament 100: the uppermost first roll forming composite roller group 67a, the second roll forming composite roller group 67b at the middle height position, and the lowermost third roll forming composite roller group 67c. Since the reinforcing filament 100 runs vertically downwards at this position, the above three roll forming composite roller groups are arranged along the same vertical straight line.

[0048] When the reinforcing filament 100 and the molten plastic sheets 200 extruded on both sides pass through the roll gap of the first set of roll forming compound rollers 67a, the molten plastic sheets 200 are rolled together to bond them. At this time, the resulting reinforcing strip has a relatively high temperature and has not yet been formed into the predetermined shape (especially the thickness). This initially formed reinforcing strip continues to pass through the second set of roll forming compound rollers 67b and the third set of roll forming compound rollers 67c, where it can be further refined and shaped. Thus, through multiple roll forming passes (and subsequent cooling), the reinforcing strip can be gradually formed into the predetermined design thickness, resulting in a high-quality final reinforcing strip 300. For this purpose, the roll gap formed by the upper roll forming compound rollers can be set to be equal to or greater than the roll gap formed by the lower roll forming compound rollers. For example, the roll gaps of the first set of roll forming compound rollers 67a, the second set of roll forming compound rollers 67b, and the third set of roll forming compound rollers 67c shown in the figure can be set to decrease sequentially.

[0049] To achieve a good rolling effect, the rollers 671 in the roll forming compound are preferably driven to rotate during the rolling process, so as to roll relative to the surface of the molten plastic sheet 200. In particular, the rollers 671 of the first roll forming compound 67a should be actively rotating. For this purpose, a servo drive mechanism (such as a servo motor) can be provided, which is driven to the rollers 671 to rotate so as to roll the surface of the molten plastic sheet 200. Through this roll forming compound, air bubbles can be effectively prevented from being trapped in the formed reinforcing strip 300 (effectively extruding the gas at the interface between the reinforcing filament 100 and the molten plastic sheet 200), so that the reinforcing filament 100 and the molten plastic sheet 200 are pressed and compacted, ensuring good bonding quality.

[0050] Furthermore, an air-cooling device 69 can be provided between adjacent roll forming composite roll groups. The air-cooling device 69 is arranged on both sides of the reinforcing belt 300 opposite to the belt surface. By blowing cooling air onto the initially roll-formed reinforcing belt 300, its surface is initially cooled and shaped. Then, the next set of roll forming composite roll groups further rolls it, realizing the gradual shaping and cooling of the reinforcing belt 300, and finally achieving the required process thickness.

[0051] Depending on process requirements and product specifications, it may be necessary to adjust the roller gap between the rollers 671 in the roll forming compound roller group. Therefore, the vertical roll forming equipment 106 of this invention can be equipped with a gap adjustment mechanism 68 for adjusting this roller gap. This gap adjustment mechanism 68 can be configured in various forms, as long as it can adjust the spacing between the paired rollers 671. Preferably, the gap adjustment mechanism 68 adopts a screw drive and is driven by a servo motor to ensure adjustment accuracy. Alternatively, it can be configured as a cylinder directly driving the rollers 671, or manually adjusted using a handwheel.

[0052] The gap adjustment mechanism 68 is driven to one or both rollers 671 of the roll forming compound roller group. In one embodiment, the axis of one roller in the roll forming compound roller group is fixed, while the axis of the other roller can be adjusted, thus requiring a drive connection to the gap adjustment mechanism 68 and the ability to be driven closer to or further away from the fixed roller. In this way, the fixed roller can determine the reference plane of the compounding position, and only one side of the roller needs to be adjusted when the roll forming gap needs to be adjusted, making the operation simple and easy to control. In another embodiment, the axes of both rollers in the roll forming compound roller group can be adjusted to synchronously move closer to or further away from the running path of the reinforcing filament 100. This can be achieved using methods such as forward and reverse threaded screw drives, so that when the roll forming gap is adjusted, there is no need to adjust the running path of the reinforcing filament 100 at that position accordingly.

[0053] Combination Figures 6 to 11 As shown, this utility model provides a sheet extrusion system 70 and a sheet extrusion die 73 that can be used in the above-mentioned vertical roll forming equipment 106. The sheet extrusion system 70 includes an extruder 71, a sheet extrusion die 73, and a flow distribution module 72 for supplying the material flow extruded from the extruder 71 to the sheet extrusion die 73. The flow distribution module 72 may be equipped with a flow distribution module heating plate 721 to heat the material flow passing through it.

[0054] The sheet extrusion die 73 includes a die body 731, within which are a filament passage 732 for multiple rows of reinforcing filaments 100 running side-by-side to pass through, and a first die internal flow channel 733 and a second die internal flow channel 734 symmetrically distributed on both sides of the filament passage 732. This allows for the simultaneous conveying and extrusion of molten plastic sheets 200 from both sides of the side-by-side reinforcing filaments 100 through the first die internal flow channel 733 and the second die internal flow channel 734. Thus, the material flow extruded from the extruder 71 can be synchronously distributed to the first die internal flow channel 733 and the second die internal flow channel 734 of the sheet extrusion die 73 via a flow distribution module 72.

[0055] By forming a first internal flow channel 733 and a second internal flow channel 734 within the die body 731 of the sheet extrusion die 73, which can separately convey and extrude molten plastic sheets 200 onto both sides of the parallel-running reinforcing filaments 100, the sheet extrusion system 70 can use the same extruder to supply molten plastic and facilitates the simultaneous extrusion of molten plastic with identical temperature and composition on both sides of the reinforcing filaments 100. This effectively reduces equipment costs and control difficulty. Furthermore, by allowing the filament passage 732 through which the reinforcing filaments 100 pass, it is also convenient to ensure that the molten plastic sheets 200 on both sides of the reinforcing filaments 100 are symmetrically extruded and distributed by determining the installation orientation of the sheet extrusion die 73, which helps to ensure the product quality of the resulting reinforcing strip.

[0056] In a preferred embodiment of the sheet extrusion die 73, such as Figure 7 As shown, along the direction perpendicular to the arrangement of the reinforcing filaments 100, an inner heating plate 735, spaced apart and opposite to each other, can be connected to the side of the mold body 731 facing the filament passage 732. This allows for heat preservation of the reinforcing filaments 100 passing through the filament passage 732, maintaining a suitable temperature for the reinforcing filaments 100 to be composited with the molten plastic sheet 200, thus ensuring composite quality. The spacing between the inner heating plates 735 on both sides of the filament passage 732 should not be too large, preferably ranging from 5mm to 100mm, to ensure a high heat preservation temperature for the filament passage 732. Additionally, an outer heating plate 736 can be connected to the outer side of the mold body 731 away from the filament passage 732. Under the action of the outer heating plate 736 and the aforementioned inner heating plates 735 (if present), the material flowing through the first mold inner channel 733 and the second mold inner channel 734 can be heated.

[0057] Based on the integration of the first die internal flow channel 733 and the second die internal flow channel 734 into the same die body 731, the sheet extrusion die 73 can be formed in various different forms. For example, the die body 731 can be configured to include a first die body 7311 and a second die body 7312 that are spaced apart from each other and connected as a single unit, with the filament passage 732 located between the first die body 7311 and the second die body 7312. The first die internal flow channel 733 is located within the first die body 7311, and the second die internal flow channel 734 is located within the second die body 7312. Thus, the first die body 7311 and the second die body 7312 can be manufactured independently, and the two can be connected as a single unit by an intermediate connector, defining the filament passage 732 between them for reinforcing the passage of the filament 100, thus avoiding a significant increase in manufacturing and maintenance difficulty.

[0058] In the preferred embodiment illustrated, the first mold body 7311 and the second mold body 7312 are connected as a whole by mold side plates 7313 respectively connected to their two sides. Specifically, the mold body 731 may include mold side plates 7313 connected to both sides of the first mold body 7311 and the second mold body 7312 along the arrangement direction of the reinforcing filaments 100, and connecting the first mold body 7311 and the second mold body 7312 to each other as a whole. The mold side plates 7313 can be sealed to both sides of the first mold body 7311 and the second mold body 7312, which allows the first mold body 7311 and the second mold body 7312 to be connected to each other as two opposing half molds, and the mold side plates 7313 close the two ends of the first mold internal flow channel 733 and the second mold internal flow channel 734 along the arrangement direction parallel to the reinforcing filaments 100.

[0059] like Figure 11 As shown, the first mold body 7311 and the second mold body 7312 may each include a left half mold and a right half mold that are sealed and connected to each other. The first mold internal flow channel 733 and the second mold internal flow channel 734 may be formed on the opposing surfaces of the left half mold and the right half mold, respectively. This facilitates the formation of the first mold internal flow channel 733 and the second mold internal flow channel 734 by machining flow channel grooves on the opposing surfaces of the left half mold and the right half mold, reducing machining difficulty.

[0060] Furthermore, the left half of the first mold body 7311 and the right half of the second mold body 7312 may each have a mold body 731a, an elastic connecting part 731b, and a sheet thickness adjustment part 731c, respectively. An adjusting element 737, such as a bolt, is connected to the mold body 731a, with the free end of the bolt abutting against the sheet thickness adjustment part 731c. By adjusting the screw-in length of the bolt, the elastic connecting part 731b can be elastically deformed, thereby driving the sheet thickness adjustment part 731c to move relative to the mold body 731a, changing the distance between it and the other mold half (die 731d), thus changing the thickness of the extruded molten plastic sheet 200. For example, Figure 9 As shown, multiple adjusting elements 737 can be connected to the half-die body 731a along the width direction of the molten plastic sheet 200 to ensure that the molten plastic sheet 200 extruded before and after adjustment has a uniform thickness at different width positions.

[0061] For ease of adjustment, the sheet extrusion system 70 can be configured to allow for three-dimensional adjustment of the position of the sheet extrusion die 73, i.e. Figure 5The middle arrow points to the Z direction and the X and Y directions perpendicular to it (i.e., front-back, left-right, and up-down directions). Furthermore, the die 731d of the sheet extrusion die 73 can be formed with multiple forming grooves (not shown) corresponding to the parallel-running reinforcing filaments 100. Using a grooved die or grooved strip facilitates the matching of the extruded molten plastic sheet 200 with the reinforcing filaments 100, thereby further reducing the risk of gas inclusions.

[0062] Corresponding to the first mold inner flow channel 733 and the second mold inner flow channel 734, the first mold body 7311 and the second mold body 7312 may also be provided with two outer flow channels 738 for connecting to the two distribution ports of the flow distribution module 72. The outer flow channel 738 may have an outer flow channel heating element 7381 for heating the material flow that is about to be supplied to the first mold inner flow channel 733 and the second mold inner flow channel 734.

[0063] As mentioned above, before the reinforcing filament 100 reaches the roll forming compound roller group, it needs to be split and heated to facilitate bonding with the molten plastic sheet 200 and ensure product quality. Therefore, at least some components for splitting and heating can be integrated into the vertical roll forming equipment 106. Thus, upstream of the first roll forming compound roller group 67a, along the running direction of the reinforcing filament, a filament heating device for heating the reinforcing filament 100 and / or a splitting unit for splitting multiple strands of reinforcing filament 100 into multiple rows running side-by-side at predetermined intervals can be provided. In the illustrated preferred embodiment, the main filament heating device for heating the reinforcing filament 100 is an oven 62 located at the top of the frame 60. Furthermore, a hot roller 64 can be provided downstream to heat / keep the reinforcing filament 100 using hot water circulation or electric heating rods, etc. This hot roller 64 also serves to turn the reinforcing filament 100 downwards. The filament separating unit includes a filament separating roller 63 (a roller with a limiting groove formed on its outer circumferential surface) or other filament separating components (such as a filament separating comb) disposed between the oven 62 and the hot roller 64.

[0064] In one alternative embodiment, a filament heat preservation device may be provided above the first set of roller pressing composite roller group 67a along the running direction of the reinforcing filament 100, so that the reinforcing filament 100 maintains its heated surface temperature before running into the roller pressing gap of the roller pressing composite roller group, so as to facilitate bonding with the molten plastic sheet 200.

[0065] Although the reinforcing filaments 100 have been split into multiple parallel rows, their position may still shift due to vibration or other factors during their movement into the roll gap of the roll forming compounding roller group, affecting the composite quality. Therefore, a combing device 66 can be provided between the sheet extrusion die 73 and the first roll forming compounding roller group 67a. This combing device 66 can be positioned adjacent to the first roll forming compounding roller group 67a, allowing the reinforcing filaments 100 to extend through the gap between the comb teeth of the combing device 66 and move into the roll gap of the first roll forming compounding roller group 67a. This ensures that the reinforcing filaments 100 enter the roll gap more stably, guaranteeing a high composite quality for the reinforcing belt.

[0066] The various functional components of the vertical roll forming equipment 106 can be mounted on a frame 60, which may also be equipped with guide rollers to change the running height of the reinforcing filament 100 and the resulting reinforcing belt 300. In the preferred embodiment shown in the figure, a first guide roller 61a, a second guide roller 61b, and a third guide roller 61c are mounted on the frame 60. The reinforcing filament 100 is unwound, bundled, and combed into multiple rows at a first height position, then turns upward around the first guide roller 61a, and is raised to a higher second height after passing the second guide roller 61b at the top of the frame 60, thereby facilitating top-down movement and lamination with the molten plastic sheet 200. The laminated reinforcing belt 300 can run around the third guide roller 61c, changing its running direction after exiting the roll forming assembly, returning to a relatively low horizontal running height, facilitating subsequent cooling, shaping, and traction finishing processes.

[0067] This utility model also provides a reinforced belt production line that includes the above-mentioned vertical roll forming equipment for reinforced belts.

[0068] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A sheet extrusion die (73), characterized in that, The mold body (731) includes a thread passage (732) through which multiple rows of reinforcing filaments (100) running side by side pass, and a first mold inner flow channel (733) and a second mold inner flow channel (734) symmetrically distributed on both sides of the thread passage (732) to simultaneously convey and extrude molten plastic sheets (200) on both sides of the reinforcing filaments (100) running side by side through the first mold inner flow channel (733) and the second mold inner flow channel (734).

2. The sheet extrusion die (73) according to claim 1, characterized in that, Along the arrangement direction perpendicular to the reinforcing filaments (100), an inner heating plate (735) is connected to the side of the mold body (731) facing the filament passage (732) and is arranged opposite to each other at intervals, and / or, an outer heating plate (736) is connected to the outer side of the mold body (731) away from the filament passage (732).

3. The sheet extrusion die (73) according to claim 2, characterized in that, The spacing between the inner heating plates (735) arranged opposite each other at intervals is 5mm-100mm.

4. The sheet extrusion die (73) according to claim 1, characterized in that, The mold body (731) includes a first mold body (7311) and a second mold body (7312) that are spaced apart from each other and connected as a whole. The wire passage (732) is located between the first mold body (7311) and the second mold body (7312). The first mold inner flow channel (733) is located in the first mold body (7311), and the second mold inner flow channel (734) is located in the second mold body (7312).

5. The sheet extrusion die (73) according to claim 4, characterized in that, The mold body (731) includes a mold side plate (7313) that is connected to both sides of the first mold body (7311) and the second mold body (7312) along the arrangement direction of the reinforcing filaments (100) and connects the first mold body (7311) and the second mold body (7312) into one unit.

6. The sheet extrusion die (73) according to claim 4, characterized in that, The first mold body (7311) and the second mold body (7312) respectively include a left half mold and a right half mold that are sealed and connected to each other, and the first mold inner flow channel (733) and the second mold inner flow channel (734) are respectively formed on the surfaces of the left half mold and the right half mold that are opposite to each other.

7. The sheet extrusion die (73) according to claim 6, characterized in that, In the first mold body (7311) and the second mold body (7312), the left or right half mold has a half mold body (731a), an elastic connecting part (731b) and a sheet thickness adjustment part (731c). An adjustment element (737) is connected to the half mold body (731a). The adjustment element (737) can be adjusted to drive the sheet thickness adjustment part (731c) to move relative to the half mold body (731a) by causing the elastic connecting part (731b) to undergo elastic deformation, so as to change the thickness of the extruded molten plastic sheet (200).

8. A sheet extrusion system (70), characterized in that, It includes an extruder (71), a sheet extrusion die (73) according to any one of claims 1 to 7, and a flow distribution module (72) for synchronously distributing the material flow extruded by the extruder (71) to the first die inlet channel (733) and the second die inlet channel (734) of the sheet extrusion die (73).

9. A vertical roll forming device for reinforcing belts, characterized in that, include: The sheet extrusion system (70) according to claim 8; and, At least one set of roll forming composite rollers (67a, 67b, 67c) includes rollers (671) arranged in pairs and spaced apart below the sheet extrusion die (73). The pairs of rollers (671) define a roll forming gap for receiving the reinforcing filaments (100) running from top to bottom and the molten plastic sheets (200) extruded on both sides thereon. The rollers are capable of forming a reinforcing strip (300) by roll forming multiple rows of reinforcing filaments (100) running side by side with the molten plastic sheets (200) on both sides of them.

10. A reinforced belt production line, characterized in that, The equipment for vertical roll forming of reinforcing belts according to claim 9.

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