Pipe forming production line

Abstract

The application discloses a pipe forming production line for manufacturing a hollow pipe product, which comprises, in sequence along a forming advancing direction of the product, a yarn arranging device, a preforming device for laying the yarn, and a forming device for curing the yarn soaked with glue into the product; the preforming device comprises a rack and a glue soaking device for soaking the yarn and a core mold fixing device for fixing the core mold, which are arranged in sequence along the length direction of the rack; the glue soaking device comprises a glue soaking rack and a yarn collecting plate, a glue soaking groove and a plurality of yarn separating plates arranged in sequence along the length direction of the glue soaking rack; the yarn is led out from the yarn arranging device, threaded through the yarn collecting plate, introduced into the glue soaking groove, separated into a plurality of portions and threaded out from the plurality of yarn separating plates, gradually approaches the core mold from the outside of the core mold and uniformly covers the outside of the core mold to form an axial layer, and enters the forming device for curing.

Description

Technical Field

[0001] This application relates to the field of composite material molding technology, and in particular to a pipe molding production line. Background Technology

[0002] Currently, composite pipes are generally produced through pultrusion and pultrusion winding processes. Existing pultrusion and pultrusion winding equipment has a simple impregnation device structure, which directly piles all the yarns required for production into the impregnation tank to immerse them in resin. This can easily lead to problems such as insufficient impregnation of the yarns and yarn knotting. At the same time, it is impossible to ensure that the yarns are evenly coated on the outer periphery of the mandrel after impregnation, thus affecting product quality.

[0003] Furthermore, when using the winding process, composite material winding molding equipment generally employs a structure with a rotary table mounted on an integral frame. The rotary table winds resin-impregnated fibers onto a mandrel, thus achieving fiber pre-forming. However, existing winding molding equipment uses simple yarn threading paths and methods, making it difficult to ensure adequate winding tension. This results in loosening and displacement of the yarn as it winds onto the mandrel surface, affecting product quality. Summary of the Invention

[0004] To address the shortcomings of existing technologies, one of the objectives of this application is to provide a tube forming production line that enables yarn to be fully impregnated with resin and then uniformly coated on the outer periphery of the mandrel, thereby ensuring product quality.

[0005] To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows: a tube forming production line is provided for manufacturing hollow tube products. Along the forming direction of the product, it includes, in sequence, a yarn laying device for placing yarn, a preforming device for laying yarn layers, and a forming device for curing the yarn impregnated with adhesive into a product. The preforming device includes: a frame and an impregnation device for impregnating yarn and a core mold fixing device for fixing the core mold, which are arranged in sequence along the length of the frame. The core mold fixing device is set on the frame. The impregnation device includes an impregnation frame and a yarn collecting plate, an impregnation tank, and several yarn separating plates arranged in sequence along the length of the frame. The yarn is sequentially drawn out from the yarn laying device, passes through the yarn collecting plate, enters the impregnation tank, is divided into several parts, passes through several yarn separating plates, bypasses the core mold fixing device, gradually approaches the core mold from the outside of the core mold, and evenly covers the outer periphery of the core mold to form an axial layer, and enters the forming device for curing.

[0006] The impregnation tank is a V-shaped tank, and an impregnation frame is installed on the impregnation tank. The impregnation frame is fitted to the inner bottom surface of the impregnation tank and is set with a certain gap.

[0007] The dipping frame includes several dipping rollers, which are arranged in a V-shape along the length of the frame at the bottom of the dipping tank.

[0008] In this process, the yarn is sequentially threaded through the gap between several dipping rollers and the inner bottom surface of the dipping tank, thereby enabling the yarn to be introduced into the dipping tank.

[0009] There are two yarn separating plates, which are set vertically at the end of the impregnation frame near the core mold fixing device. The two yarn separating plates are set at a certain angle to each other, and the opening direction of the angle is towards the yarn collecting plate.

[0010] The preforming device also includes several threading plates, which are vertically arranged on the frame and distributed in parallel along the length of the frame. The threading plates have through holes in the center for fitting the core mold, and the diameter of the through holes is larger than the diameter of the core mold. The yarn is evenly threaded in the gap between the threading plates and the core mold, so that the yarn is evenly wrapped around the outer periphery of the core mold in a circumferential direction.

[0011] The preforming device also includes several yarn guide plates, which are vertically arranged on the frame and located on the outside of the core mold fixing device. The yarn is divided into several parts and passes through several yarn guide plates in sequence to bypass the core mold fixing device.

[0012] The preforming device also includes a winding device, an impregnation device, a core mold fixing device, and a winding device arranged sequentially along the length of the frame. The winding device includes a winding motor, a winding disc, and a winding claw, which are sequentially sleeved on the outer periphery of the core mold. The winding disc is used to hold the winding yarn and has several first yarn guide holes. The winding claw has at least one third yarn guide hole. The winding motor drives the winding device to rotate, thereby causing the winding yarn to wind around the outer periphery of the axial layer to form a winding layer.

[0013] The winding yarn is sequentially led out from the first yarn guide hole, passed through the third yarn guide hole, and wound around the outer periphery of the axial layer.

[0014] The winding device also includes a yarn guide assembly sleeved on the outer periphery of the mandrel. The yarn guide assembly is located between the winding disc and the winding claw. The yarn guide assembly includes at least one yarn guide plate, and the yarn guide plate is provided with a plurality of second yarn guide holes.

[0015] The winding yarn is sequentially led out from the first yarn guide hole, passes through the second yarn guide hole, passes through the third yarn guide hole, and is wound around the outer periphery of the axial layer.

[0016] The winding claw includes a winding frame, several winding rods, and several winding components. The winding frame is sleeved on the outer periphery of the core mold. Several winding rods are evenly arranged on the outer side of the winding frame along the radial direction. The winding components are evenly arranged on the outer side of the winding frame along the axial direction. The winding rods are provided with a third yarn guide hole, and the winding components are provided with at least one fourth yarn guide hole.

[0017] The winding yarn is sequentially led out from the first yarn guide hole, passes through the second yarn guide hole, passes through the third yarn guide hole, passes through the fourth yarn guide hole, and is wound around the outer periphery of the axial layer.

[0018] The winding disc has a winding through hole at its center, and several thread guides are provided on the side of the winding disc near the yarn guide assembly. The thread guides are evenly arranged around the winding through hole on the inner side of the winding disc. The thread guides include a thread guide frame and several thread guide rods.

[0019] The winding yarn is sequentially led out from the first yarn guide hole, passed through the thread guide, passed through the second yarn guide hole, passed through the third yarn guide hole, passed through the fourth yarn guide hole, and wound around the outer periphery of the axial layer.

[0020] The beneficial effects of this application are as follows: Unlike the prior art, the tube forming production line of this application can make the yarn fully impregnated with resin and then evenly coated on the outer periphery of the core mold, ensuring product quality, and realizing the automated production of hollow tube products, reducing labor costs and increasing production efficiency.

[0021] Meanwhile, this application allows the winding yarn to be drawn out from the first yarn guide hole, pass through the second yarn guide hole, pass through the third yarn guide hole, and pass through the fourth yarn guide hole before being wound around the outer periphery of the axial layer, preventing the yarn from loosening and shifting during winding due to insufficient tension, thus affecting product quality.

[0022] Meanwhile, this application ensures that after the winding yarn is led out from the first yarn guide hole on the winding disc, it is guided to the yarn guide assembly by several yarn guide rods of the yarn guide component, thus avoiding the yarn from directly entering the second yarn guide hole from the first yarn guide hole, which would aggravate the wear of the yarn due to excessive bending and cause the yarn to break. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the structure of the winding forming equipment 100 in one embodiment of this application;

[0025] Figure 2 This is a schematic diagram of the structure of the impregnation device 120 in one embodiment of this application;

[0026] Figure 3 This is a schematic diagram of the core mold fixing device 130 in one embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the winding device 140 in one embodiment of this application;

[0028] Figure 5 yes Figure 4Enlarged view of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the structure of the support device 150 in one embodiment of this application;

[0030] Figure 7 This is a schematic diagram of the structure of the felt device 160 in one embodiment of this application;

[0031] Figure 8 This is a schematic diagram of the structure of the adhesive recovery tank 171 in one embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0033] In one embodiment, see Figure 1 A winding forming apparatus 100 is provided, comprising: a horizontally arranged frame 110, an impregnation device 120 for impregnating yarn, a mandrel fixing device 130 for fixing a mandrel, and a winding device 140 for winding yarn onto the mandrel. The impregnation device 120, the mandrel fixing device 130, and the winding device 140 are arranged sequentially along the length of the frame 110. The frame 110 includes a first frame 111 and a second frame 112. The mandrel fixing device 130 is horizontally arranged on the first frame 111, and the winding device 140 is vertically arranged on the second frame 112. The first frame 111 and the second frame 112 are separately arranged. Specifically, the first frame 111 and the second frame 112 are respectively fixed to the ground by pouring concrete, thereby achieving the separate arrangement of the first frame 111 and the second frame 112. Compared to existing technologies where both the mandrel and the rotary table are fixed to the overall frame, the stress on the mandrel and rotary table during the forming process causes vibration of the overall frame, which in turn affects the stability of the yarn guiding assembly on the rotary table, causing the fiber layer wound on the mandrel surface to shift and reducing product quality. The winding forming equipment 100 provided in this application, by separating the first frame 111 that fixes the mandrel fixing device 130 and the second frame 112 that fixes the winding device 140, can avoid the fiber layer shifting caused by vibration of the winding device 140 due to stress on the mandrel, effectively improving the product qualification rate.

[0034] See Figure 2The impregnation device 120 includes an impregnation frame 121, a yarn collecting plate 122, two yarn separating plates 123, an impregnation tank 124, and an impregnation frame 125. The yarn collecting plate 122, the impregnation tank 124, and the two yarn separating plates 123 are sequentially arranged on the impregnation frame 121 along the length of the frame 110, and the impregnation frame 125 is arranged on the impregnation tank 124. Specifically, the yarn collecting plate 122 is arranged vertically at the end of the impregnation frame 121 away from the core mold fixing device 130. The yarn collecting plate 122 has several yarn collecting holes for threading the yarn and guiding the yarn into the impregnation tank 124 to facilitate subsequent yarn impregnation. The impregnation tank 124 is a V-shaped groove, that is, the impregnation tank 124 is a downwardly concave V-shape. The impregnation tank 124 is horizontally arranged on the impregnation frame 121 to hold the resin liquid. A dipping frame 125 is provided on the dipping tank 124. The dipping frame 125 is fitted to the inner bottom surface of the dipping tank 124 and is set with a certain gap. Specifically, the dipping frame 125 includes a number of dipping rollers 1251. The number of dipping rollers 1251 are arranged to form a V-shaped structure on the dipping frame 125, that is, the number of dipping rollers 1251 are arranged on the dipping frame 125 along the length direction of the frame 110 at the bottom of the dipping tank 124 to form a V-shaped structure. There is a certain gap between the number of dipping rollers 1251 and the bottom plate of the dipping tank 124. After the yarn passes through the yarn collecting hole on the yarn collecting plate 122, it is sequentially inserted into the gap between the number of dipping rollers 1251 and the inner bottom surface of the dipping tank 124 to be soaked in the glue. The number of dipping rollers 1251 can keep the yarn at the bottom of the dipping tank 124, ensuring the wetting effect of the yarn. Two yarn separating plates 123 are vertically arranged at the end of the impregnation frame 121 near the core mold fixing device 130. The two yarn separating plates 123 are arranged opposite each other at a certain angle, and the opening direction of the angle is towards the yarn collecting plate 122. The yarn separating plates 123 are provided with several yarn separating holes for yarn to pass through. The two yarn separating plates 123 can divide the yarn that has passed through the impregnation tank 124 into two parts. At the same time, the opening direction of the angle between the two yarn separating plates 123 is towards the yarn collecting plate 122, so that the two parts of yarn after impregnation can pass through the yarn separating plates 123 to both sides away from the center line of the core mold fixing device 130. This allows the two parts of yarn to bypass the core mold fixing device 130, gradually approach the core mold from the outside of the core mold, and cover the outer periphery of the core mold to form an axial layer to achieve preforming. It should be noted that the included angle between the two yarn separating plates 123 can be 100°, 120°, 150°, etc., as long as the two yarns can smoothly bypass the core mold fixing device 130 and smoothly transition to the next station, avoiding excessive bending of the yarn and causing wear during the movement. Therefore, in other embodiments, the included angle between the two yarn separating plates can be adjusted according to the specific structure of the equipment. The number of yarn separating plates can also be adjusted to three, four, etc., according to process requirements, and the specific positions of multiple yarn separating plates can also be adjusted accordingly. No specific restrictions are made here.

[0035] The impregnation tank 124 also has a constant temperature heating function. By setting a suitable temperature, the resin solution in the impregnation tank 124 can always maintain a suitable viscosity, which is convenient for the yarn to be impregnated. This avoids the situation where the resin solution viscosity is too high when the temperature is too low, so that the yarn cannot be fully impregnated, thus affecting the product quality.

[0036] See Figure 1 and Figure 3 The core mold fixing device 130 is horizontally mounted on the first frame 111 and is used to adjust and fix the core mold. The core mold fixing device 130 includes an adjusting frame 131 and an adjusting block assembly 132; the adjusting frame 131 includes an upper top plate 1311, a first side plate 1312, a lower top plate 1313, and a second side plate 1314, which are sequentially fixedly connected end-to-end, thus making the adjusting frame 131 a hollow structure with a rectangular cross-section of its inner cavity. Figure 3 In the orientation, the two sides of the adjustment frame 131 without a plate surface are defined as the front side and the rear side of the adjustment frame 131, respectively, and the front and rear sides of the adjustment frame 131 are connected for the core mold to pass through. Two sliding grooves are provided on the upper top plate 1311, the first side plate 1312, the lower top plate 1313, and the second side plate 1314. The sliding grooves are located on the inner side of the front and rear edges of the adjustment frame 131, that is, perpendicular to the edges where the upper top plate 1311, the first side plate 1312, the lower top plate 1313, and the second side plate 1314 connect.

[0037] The upper top plate 1311 is parallel to the lower top plate 1313, and the first side plate 1312 is parallel to the second side plate 1314. An adjusting block group 132 is disposed within the adjusting frame 131. The adjusting block group 132 includes two transverse adjusting blocks 1321 and two longitudinal adjusting blocks 1322. The short sides of the two sides of the transverse adjusting blocks 1321 are respectively located in the grooves of the upper top plate 1311 and the lower top plate 1313, and the short sides of the two sides of the longitudinal adjusting blocks 1322 are respectively located in the grooves of the first side plate 1312 and the second side plate 1314. The adjusting block group 132 slides within the grooves to adjust the position of the core mold, thereby limiting and fixing the position of the core mold. It should be noted that since the two transverse adjusting blocks 1321 and the two longitudinal adjusting blocks 1322 need to slide within the grooves, they must not interfere with each other; that is, any two adjacent grooves must not intersect.

[0038] In this embodiment, following the principle of the upper top plate 1311 being on top and the lower top plate 1313 being on the bottom, the so-called longitudinal adjustment block 1322 is used to adjust the position of the core mold in the vertical direction; the so-called transverse adjustment block 1321 is used to adjust the position of the core mold in the horizontal direction. Specifically, the core mold fixing device 130 includes several adjusting screws, and several screw holes are provided at the position of the adjusting block group 132 projected onto the adjusting frame 131. The adjusting screws pass through the screw holes to drive the two transverse adjustment blocks 1321 and the two longitudinal adjustment blocks 1322 to move, thereby adjusting the position of the core mold in the horizontal and vertical directions. Furthermore, the adjusting screws ensure that the two transverse adjustment blocks 1321 and the two longitudinal adjustment blocks 1322 are in close contact with the core mold, thereby achieving the function of fixing the core mold. Using adjusting screws to drive the displacement of the adjusting block group 132 is simple to operate, highly flexible, and avoids direct contact between the adjusting screws and the core mold, thus preventing damage to the core mold.

[0039] In this embodiment, a set of adjustment block groups 132 is provided on the front side and the rear side of the adjustment frame 131. Each set of adjustment block groups 132 includes two horizontal adjustment blocks 1321 and two vertical adjustment blocks 1322, which can ensure the stability of the core mold adjustment and core mold fixation. In other embodiments, only one set of adjustment block groups can be provided in the adjustment frame, or two, three or more sets of adjustment block groups can be provided. Each set of adjustment block groups can also include more than two horizontal adjustment blocks and more than two vertical adjustment blocks. The specific settings can be made according to the actual adjustment requirements, and no specific limitation is made here.

[0040] See Figure 1 , Figure 4 and Figure 5 The winding device 140 is vertically mounted on the second frame 112 and is used to wind yarn around the outer periphery of the mandrel. The winding device 140 includes a winding motor 141, a winding disc 142, a yarn guide assembly 143, and a winding claw 144, which are sequentially arranged around the outer periphery of the mandrel along the length of the frame 110. The winding disc 142, the yarn guide assembly 143, and the winding claw 144 are all provided with corresponding yarn guide holes. The yarn passes through the yarn guide holes on the winding disc 142, the yarn guide assembly 143, and the winding claw 144 in sequence. The winding motor 141 drives the winding device 140 to rotate, thereby winding the yarn around the outer periphery of the mandrel, specifically around the outer periphery of the axial layer to form a winding layer. The winding disc 142, the yarn guide assembly 143, and the winding claw 144 cooperate to increase the yarn tension, preventing the yarn from loosening and shifting due to insufficient tension when winding around the outer periphery of the mandrel, thus affecting product quality. For ease of description, the yarn used to form the winding layer is defined as the winding yarn.

[0041] The winding motor 141 is a servo motor. By adjusting the speed of the servo motor, the speed of the winding device 140 can be precisely controlled, ensuring that the winding yarn maintains a stable winding tension and speed as it passes through the winding disc 142, the yarn guide assembly 143, and the winding claw 144, winding around the outer periphery of the mandrel. In other embodiments, the winding motor can be other types of motors or other driving devices, as long as they can stably drive the winding device to rotate; no specific limitations are imposed here.

[0042] Specifically, the winding disc 142 has a disc-shaped structure with a winding through-hole 1421 at its center for threading the mandrel. The winding disc 142 has several yarn bobbins 145 for holding fiber yarn rolls. These yarn bobbins 145 are evenly distributed circumferentially around the winding through-hole 1421 on one side of the winding disc 142, with the axis of each yarn bobbin 145 perpendicular to the disc surface. The winding disc 142 also has several first yarn guide holes 1422, corresponding one-to-one with the centers of the yarn bobbins 145, for threading the winding yarn from the fiber yarn rolls. The yarn guide assembly 143 is located on the other side of the winding disc 142 and includes two parallel yarn guide plates 1431 sleeved around the outer periphery of the mandrel. The yarn guide plates 1431 are annular plates and have a plurality of second yarn guide holes 14311. The plurality of second yarn guide holes 14311 are evenly distributed around the center of the yarn guide plate 1431. The second yarn guide holes 14311 on the two yarn guide plates 1431 are coaxially arranged in a one-to-one correspondence and correspond one-to-one with a plurality of first yarn guide holes 1422. The winding claw 144 includes a winding frame 1441, a plurality of winding rods 1442, and a plurality of winding elements 1443. The winding frame 1441 has a circular structure and is fitted around the outer periphery of the mandrel. The winding rods 1442 are arranged radially on the outside of the winding frame 1441. The plurality of winding rods 1442 are evenly distributed circumferentially around the center of the winding frame 1441. At least one third yarn guide hole 14421 is provided at the end of the winding rod 1442 away from the winding frame 1441, which is connected to the first yarn guide hole 1422 and the second yarn guide hole 1443. Hole 14311 is correspondingly provided; the winding member 1443 is an L-shaped plate, which is set on the outer side of the winding frame 144 away from the winding disc 142 along the length direction of the frame 110. Several winding members 1443 are evenly distributed around the center of the winding frame 1441. The short side of the winding member 1443 is fixed on the winding frame 1441. At least one fourth yarn guide hole 14431 is provided on the long side of the winding member 1443, which is correspondingly provided with the first yarn guide hole 1422, the second yarn guide hole 14311 and the third yarn guide hole 14421.

[0043] It should be noted that the winding disc 142, the yarn guide assembly 143, and the winding claw 144 are all provided with yarn guide holes that correspond to each other. That is, the first yarn guide hole 1422 on the winding disc 142, the second yarn guide hole 14311 on the yarn guide assembly 143, the third yarn guide hole 14421 on the winding rod 1442, and the fourth yarn guide hole 14431 on the winding member 1443 are all set in a one-to-one correspondence. In other words, the axes of each group of first yarn guide holes 1422, second yarn guide holes 14311, third yarn guide holes 14421, and fourth yarn guide holes 14431 are all located in the same axial plane of the mandrel. The winding yarn is sequentially passed through the guide holes on the winding disc 142, the yarn guide assembly 143, and the winding claw 144. That is, each winding yarn sequentially passes through the corresponding first guide hole 1422, second guide hole 14311, third guide hole 14421, and fourth guide hole 14431. When the winding motor 141 drives the winding device 140 to rotate, the winding yarn can maintain appropriate tension and be wound around the outer periphery of the mandrel, thus ensuring product quality.

[0044] In this embodiment, the first yarn guide hole 1422, the second yarn guide hole 14311, the third yarn guide hole 14421 and the fourth yarn guide hole 14431 are all ceramic through holes, that is, ceramic eyes are provided on the corresponding components. On the one hand, ceramic eyes have high hardness, strong wear resistance and long service life; on the other hand, ceramic eyes are usually made of precision ceramics and have a smooth surface, which can protect the wound yarn to pass through smoothly without damage.

[0045] The winding disc 142, yarn guide assembly 143, and winding claw 144 are all provided with corresponding mounting holes. Fasteners are inserted into these mounting holes to achieve a fixed connection between the winding disc 142, yarn guide assembly 143, and winding claw 144, allowing them to rotate synchronously around the mandrel. In this embodiment, the fasteners are mating bolts and screws. In other embodiments, the winding disc, yarn guide assembly, and winding claw can also be connected by other methods such as rod clamping, as long as a reliable connection between the winding disc, yarn guide assembly, and winding claw is ensured.

[0046] Further, several wire guiding members 146 are obliquely provided on one side of the winding disc 142 close to the yarn guiding assembly 143, for guiding the winding yarn passing through the first yarn guiding hole 1422 to penetrate into the second yarn guiding hole 14311, so as to avoid the winding yarn directly penetrating from the first yarn guiding hole 1422 into the second yarn guiding hole 14311 and aggravating the wear of the winding yarn due to excessive bending degree, resulting in the breakage of the winding yarn. The several wire guiding members 146 are circumferentially and uniformly distributed inside several first yarn guiding holes 1422 around the winding through hole 1421, and are correspondingly arranged with the first yarn guiding hole 1422 and the second yarn guiding hole 14311. Specifically, the wire guiding member 146 includes a wire guiding frame 1461 and several wire guiding rods 1462. The wire guiding frame 1461 has a "C" - shaped structure, which is formed by connecting two side plates and a bottom plate. The two side plates extend in the same direction away from the bottom plate on both sides where the bottom plate is connected to the two side plates. One end of the wire guiding frame 14^{61} is fixed on the winding disc 142, and the other end is a free end extending towards the direction close to the second yarn guiding hole 14311; the wire guiding rod 1462 is a cylindrical rod. Four wire guiding rods 1462 are arranged at intervals between the two side plates of the wire guiding frame 1461 and are perpendicular to the side plates. After the winding yarn passes through the first yarn guiding hole 1422, it penetrates into the gap between the four wire guiding rods 1462 and the bottom plate of the wire guiding frame 1461 from the fixed end of the wire guiding member 146, or it can also penetrate through several wire guiding rods 1462 alternately in sequence from the fixed end of the wire guiding member 146, and then penetrates into the second yarn guiding hole 14311 after passing through the free end of the wire guiding member 146, so as to realize the smooth penetration of the winding yarn.

[0047] The winding device 140 further includes a winding dipping tank 147 for containing resin glue. The winding dipping tank 147 is located below the winding claw 144, and the lower half of the winding claw 144 is located in the winding dipping tank 147. Specifically, the winding dipping tank 147 has an arc - shaped groove structure, which matches the shape of the winding claw 144, so that the winding claw 144 can rotate smoothly in the winding dipping tank 147. That is, the bottom plate of the winding dipping tank 147 is an arc - shaped plate, and its radian matches the arc shape formed by the free ends of several winding rods 1442 on the winding claw 144. Setting the winding dipping tank 147 to match the shape of the winding claw 144 can fully infiltrate the winding yarn on the winding claw 144 with a small amount of resin glue, improve the utilization rate of the resin glue, and avoid waste. A solenoid valve 1471 is provided at the bottom of the winding dipping tank 147 for regularly replacing the resin glue in the winding dipping tank 1471 to avoid the decline of product quality caused by the aging of the resin glue. When it is necessary to replace the resin glue, open the solenoid valve 1471. After the resin glue in the winding dipping tank 147 is released completely, close the solenoid valve 1471, and then pour in new resin glue. The operation is simple and efficient.

[0048] The winding impregnation tank 147 also has a constant temperature heating function. By setting a suitable temperature, the resin solution in the winding impregnation tank 147 can always maintain a suitable viscosity, which is convenient for the winding yarn to be impregnated. This avoids the situation where the resin solution viscosity is too high when the temperature is too low, so that the winding yarn cannot be fully impregnated, thus affecting the product quality.

[0049] The path for the winding yarn on the winding device 140 is as follows: the winding yarn from the yarn rolls in several yarn bobbins 145 is passed out through the corresponding first yarn guide hole 1422, then passes through the gap between the four yarn guide rods 1462 and the bottom plate of the yarn guide frame 1461 from the fixed end of the corresponding yarn guide 146, and then passes out from the free end of the yarn guide 146. It then passes through the corresponding second yarn guide hole 14311 on the yarn guide plate 1431 near the winding disc 142, the corresponding second yarn guide hole 14311 on the yarn guide plate 1431 away from the winding disc 142, the third yarn guide hole 14421 on the corresponding winding rod 1442, and the fourth yarn guide hole 14431 on the corresponding winding member 1443. When the winding device 140 is running, the winding motor 141 drives the winding device 140 to rotate, causing the winding yarn threaded on the winding device 140 to move continuously, passing through the first yarn guide hole 1422, the thread guide 146, the second yarn guide hole 14311, and the third yarn guide hole 14421 in sequence. Then, it is immersed in resin in the winding impregnation tank 147, and then passes through the fourth yarn guide hole 14431, and finally is wound on the outer periphery of the axial layer.

[0050] In other embodiments, the path of the winding yarn can be adjusted according to process requirements. For example, the winding yarn can be led out from the first guide hole and passed through the third guide hole in sequence, or the winding yarn can be led out from the first guide hole and passed through the second guide hole and the third guide hole, or the winding yarn can be led out from the first guide hole, passed through the second guide hole, the third guide hole, and the fourth guide hole before being wound around the outer periphery of the axial layer. As long as the winding yarn can maintain a suitable winding tension, it is acceptable.

[0051] The winding disc 142, the yarn guide assembly 143, and the winding claw 144 work together to increase the tension of the winding yarn. That is, after the winding yarn passes through the first yarn guide hole 1422, the second yarn guide hole 14311, the third yarn guide hole 14421, and the fourth yarn guide hole 14431 in sequence, it can maintain a suitable winding tension, so as to avoid the winding yarn from loosening and shifting due to insufficient tension when it is wound around the outer periphery of the mandrel, which would affect the product quality.

[0052] In this embodiment, sixteen yarn bobbins 145 are provided on the winding reel 142. Eight yarn bobbins 145 are evenly distributed circumferentially around the winding through hole 1421 on the inner side of the winding reel 142, and the other eight yarn bobbins 145 are evenly distributed circumferentially on the outer side of the winding reel 142. The inner and outer yarn bobbins 145 on the winding reel 142 are staggered, that is, the line connecting the center of the sixteen yarn bobbins 145 and the center of the winding reel 142 can divide the winding reel 142 into sixteen equal parts. Correspondingly, the winding disc 142 is provided with sixteen first yarn guide holes 1422 and sixteen yarn guide pieces 146, each yarn guide plate 1431 is provided with sixteen second yarn guide holes 14311, and the winding claw 144 is provided with sixteen winding rods 1442 and sixteen winding pieces 1443. Each winding rod 1442 is provided with three third yarn guide holes 14421 sequentially along its length, and each winding piece 1443 is provided with two fourth yarn guide holes 14431 sequentially along its length. The sixteen sets of first yarn guide holes 1422, second yarn guide holes 14311, third yarn guide holes 14421 and fourth yarn guide holes 14431 are arranged correspondingly. In other embodiments, the number of yarn bobbins can also be ten, twenty, etc., and the number of the first yarn guide hole, the second yarn guide hole, the third yarn guide hole, and the fourth yarn guide hole can also be ten, twenty, or increased or decreased proportionally. It can be designed according to the process requirements. As long as the yarn bobbins, the first yarn guide hole, the second yarn guide hole, the third yarn guide hole, and the fourth yarn guide hole are set in a corresponding manner, and the winding yarn is threaded through them to ensure a suitable winding tension, no specific restrictions are imposed here.

[0053] In this embodiment, each group of yarn guide holes includes one first yarn guide hole 1422, two second yarn guide holes 14311, three third yarn guide holes 14421, and two fourth yarn guide holes 14431. It should be noted that each strand of winding yarn passes sequentially through the first yarn guide hole 1422, the thread guide 146, the two second yarn guide holes 14311, any one or more third yarn guide holes 14421, and any one or more fourth yarn guide holes 14431 in each group of yarn guide holes before winding around the outer periphery of the mandrel. This ensures that the winding tension of all winding yarns remains consistent and is evenly wound around the outer periphery of the mandrel. In other embodiments, other combinations of yarn guide holes can also be used, such as providing only one second yarn guide hole, one third yarn guide hole, and one fourth yarn guide hole, or omitting the second yarn guide hole, or providing more types of yarn guide holes. Adjustments can be made according to specific needs, as long as the winding yarn maintains a suitable winding tension after sequentially passing through the yarn guide holes. No specific limitations are imposed here.

[0054] In this embodiment, the winding forming equipment 100 includes two winding devices 140, which are arranged opposite to each other along the length of the frame. Two winding motors 141 drive the two winding devices 140 to rotate in opposite directions, thereby achieving bidirectional winding of the yarn. By using two winding devices 140 for bidirectional winding, two layers of circumferential structures with the same winding angle and opposite directions can be formed around the mandrel, improving the circumferential strength of the product. Alternatively, the two winding motors 141 can drive the two winding devices 140 to wind in the same direction, sequentially forming two layers of circumferential structures with the same winding angle and direction around the mandrel; adjustments can be made according to the specific product design. It should be noted that when the winding angle of the winding yarn is less than 85°, the design of the winding angle has a significant impact on the mechanical properties of the product. Usually, two winding devices 140 are required for bidirectional winding to ensure that the product's winding layer layup structure is symmetrical and the stress is reasonable. When the winding angle of the winding yarn is greater than or equal to 85°, the design of the winding angle has a smaller impact on the mechanical properties of the product. It can be approximated that the winding angle of the winding yarn is 90°. In this case, whether two winding devices 140 are used for bidirectional or unidirectional winding, the final circumferential structure of the product can be considered to be approximately the same. Since the winding claws 144 and yarn bobbins 145 are located on opposite sides of the winding reel 142 on the same winding device 140, and the two winding devices 140 are arranged back-to-back, that is, the yarn bobbins 145 on the two winding reels 142 are arranged opposite each other, and the winding claws 144 of the two winding devices 140 are arranged back-to-back, on the one hand, the opposite arrangement of the yarn bobbins 145 on the two winding reels 142 allows the operator to change the yarn rolls on the two winding reels 142 at a position between the two winding reels 142, resulting in high work efficiency; on the other hand, when the winding angle of the yarn is greater than or equal to 85°, the two winding devices... The winding claws 144 on the device 140 are arranged opposite to each other, providing sufficient space for the two winding devices 140 to wind the yarn around the outer periphery of the mandrel sequentially. This allows the two winding devices 140 to alternately perform yarn changing operations without stopping the machine when winding in both directions or in the same direction. That is, when one winding device 140 stops to change yarn, the winding speed of the other winding device 140 is doubled, so that the product can continue production with the same wall thickness. After one winding device 140 finishes changing yarn, the above operation is repeated for the other winding device to change yarn, thereby achieving uninterrupted production and improving production efficiency. In other embodiments, one or three winding devices can also be set, depending on the product structure requirements, and no specific limitation is made here.

[0055] See Figure 1 and Figure 6The winding molding equipment 100 also includes several height-adjustable support devices 150. The support devices 150 are arranged below the mandrel along the width direction of the frame 110, and the several support devices 150 are distributed parallel to each other along the length direction of the frame 110. The multiple height-adjustable support devices 150 below the mandrel can support the mandrel during installation and removal, and assist the mandrel in smoothly entering and exiting the winding device 140, making operation simple and work efficiency high.

[0056] The support device 150 is a screw auger jack, including a transmission frame 151, a movable frame 152, a support rod 153, two support auxiliary components 154, and a handwheel 155. Specifically, the transmission frame 151 is fixed to the frame 110 along its width; the movable frame 152 is connected to the transmission frame 151 via a screw, allowing the movable frame 152 to move along the screw axis, i.e., vertically; the support rod 153 is a rod with a circular cross-section, fixedly mounted on the movable frame 152 along the width of the frame 110, and is used to support the core mold; the two support auxiliary components 154 have a frustum structure, are movably connected to the support rod 153 and coaxially arranged with the support rod 153, and are used to assist in supporting the core mold. The smaller bottom surfaces of the two support auxiliary components 154 are arranged opposite each other, so that the two support... The auxiliary components 154 are arranged with V-shaped openings facing each other. Since the core mold is usually a cylindrical structure, the V-shaped openings allow the core mold to be held in place by the two support auxiliary components 154 when it is placed on the support rod 153, making it less likely to roll and slip off. The handwheel 155 is connected to the transmission frame 151 through a connecting rod. By rotating the handwheel 155, the gear in the transmission frame 151 can be rotated, which in turn drives the lead screw to rise or fall, thereby controlling the moving frame 152 to move up and down in the vertical direction. In other embodiments, a servo motor can also be set to control the movement of the moving frame in the vertical direction to achieve automated operation and precise control of the movement distance.

[0057] Since the auxiliary support 154 is in direct contact with the core mold, to avoid damage to the core mold surface due to friction when pushing the core mold, the auxiliary support 154 is made of nylon. Nylon has high mechanical strength, good toughness, a smooth surface, and a low coefficient of friction, and will not cause damage to the core mold surface. In other embodiments, the auxiliary support can be made of other materials, as long as its surface is smooth and will not cause damage to the core mold surface.

[0058] In this embodiment, there are four support devices 150, distributed parallel to each other along the length of the frame 110. Two support devices 150 are located between the core mold fixing device 130 and the winding device 140 near the core mold fixing device 130, one support device 150 is located on the side of the other winding device 140 away from the core mold fixing device 130, and one support device 150 is located between the two winding devices 140. In other embodiments, the number and installation position of the support devices can be designed according to the length requirements of the equipment, and are not specifically limited here.

[0059] When installing the mandrel, adjust the height of several support devices 150 to be above the lowest point of the winding through hole 1421, that is, adjust the height of the support rod 153 to be slightly higher than the lowest point of the winding through hole 1421, so that the mandrel can pass smoothly through the winding through hole 1421. At this time, use a crane to lift one end of the mandrel to the support device 150 furthest from the mandrel fixing device 130, and slowly push the mandrel through the winding device 140 farthest from the mandrel fixing device 130, the support device 150, the winding device 140 close to the mandrel fixing device 130, the two support devices 150, and the mandrel fixing device 130 in sequence, and then fix it on the mandrel fixing device 130. After the mandrel is fixed, adjust the height of several support devices 150 to be below the lowest point of the mandrel, that is, adjust the height of the support rod 153 to be lower than the lowest point of the mandrel, so that the support devices 150 will not affect the production of the product. The operation of disassembling the mandrel is the same and will not be described again. Several support devices 150 are set below the core mold, so that the core mold can be erected on the support devices 150 during installation and disassembly. Compared with the traditional direct hoisting of the core mold, the operation is simple and the work efficiency is high when the core mold is inserted into and removed from the winding device.

[0060] Continue reading Figure 1 and Figure 7The winding molding equipment 100 also includes a felt device 160, which is fixedly mounted on the first frame 111 and located above the core mold fixing device 130. Specifically, the felting device 160 includes several felt hanging frames 161, a tensioner 162, a felt roll impregnation tank 163, several felt guide rods 164, and a felt guide (not shown). The several felt hanging frames 161 are fixed to the first frame 111 along the width direction of the frame 110 and are used to hold the felt rolls. The tensioner 162 is connected to one end of the felt hanging frame 161 and is used to increase the tension of the felt. The felt roll impregnation tank 163 is fixed to the first frame 111 along the width direction of the frame 110 and is located below the felt hanging frames 161. It is used to contain resin liquid to impregnate the felt. Two scraper blades 1631 are provided on the felt roll impregnation tank 163 along the width direction of the frame 110. There is a certain gap between the two scraper blades 1631. When the felt is impregnated with resin liquid, it passes through the gap between the two scraper blades 1631. Excess resin is scraped back from the felt fabric into the felt roll impregnation tank 163 to avoid waste. The rest of the structure of the felt roll impregnation tank 163 is similar to that of the winding impregnation tank 147 and will not be described again. Three felt guide rods 164 are fixed on the first frame 111 along the width direction of the frame 110 and are distributed in parallel. One of the felt guide rods 164 is located in the felt roll impregnation tank 163 and has a certain gap between it and the bottom plate of the felt roll impregnation tank 163. The felt fabric is inserted into this gap and impregnated with resin, so that the felt fabric is always at the bottom of the felt roll impregnation tank 163 to ensure the impregnation effect of the felt fabric. The other two felt guide rods 164 are located above and below the aforementioned felt guide rod 164, respectively, to increase the tension of the felt fabric. The felt guide is fixed on the frame 110 and located above the core mold to make the felt fabric cover the outer periphery of the core mold in a cylindrical shape.

[0061] When the felting device 160 is running, after the felt cloth on the felting frame 161 is lowered, it first passes through the gap between the felt roll impregnation tank 163 and the felt guide rod 164 above it, and then passes through the gap between the two scraper plates 1631, the felt guide rod 164 above the felt guide rod 164, and the felt guide rod 164 below the felt guide rod 164 in sequence, and then forms a cylindrical shape through the felt guide, and finally covers the outer periphery of the core mold.

[0062] In this embodiment, there are three felt hanging frames 161 and three felt walking rods 164. In other embodiments, the number and placement of felt hanging frames and felt walking rods can be designed according to process requirements, and no specific restrictions are imposed here.

[0063] See Figure 1 and Figure 8The winding molding equipment 100 also includes an adhesive recovery device 170, which comprises several adhesive recovery tanks 171 and several adhesive recovery boxes. The adhesive recovery tanks 171 are horizontally arranged on the frame 110 along its length and are all located below the yarn movement path. Each adhesive recovery tank 171 has a recovery hole 1711 at its bottom, which communicates with the adhesive recovery box. Since excess resin drips from the yarn after it has been impregnated with the adhesive during movement, the multiple adhesive recovery tanks 171 and boxes allow for the individual recovery of resin dripping from various parts during the pre-forming process. This high recovery efficiency effectively avoids aging and failure of the resin due to excessively long return paths or prolonged exposure to air, thus improving the recycling rate of the resin.

[0064] The adhesive recovery tank 171 has a four-sided pyramidal structure, formed by welding four triangular stainless steel plates together. A recovery hole 1711 is located at the bottom of the interconnected sections of the four stainless steel plates. When resin drips onto the adhesive recovery tank 171, the pyramidal structure allows the resin to flow along the side wall of the tank into the recovery hole 1711, and then through a pipe into the adhesive recovery box, achieving rapid resin recovery. In other embodiments, the adhesive recovery tank can also be conical, triangular pyramidal, or other structures, and can be made of steel plates or other materials, or manufactured using a one-piece molding method, as long as rapid resin recovery is achieved; no specific limitations are imposed here.

[0065] Along the yarn's movement path, due to the long span between some structures of the winding molding equipment 100, it is inconvenient to install a resin recovery tank 171. Therefore, several resin return plates 172 are installed. One portion of the resin return plates 172 is connected at one end to the impregnation device 120 and at the other end to the resin recovery tank 171. When resin drips onto this portion of the resin return plates 172, the resin quickly flows back into the impregnation device 120 along the resin return plates 172. The other portion of the resin return plates 172 is connected at both ends to two resin recovery tanks 171 respectively. When resin drips onto this portion of the resin return plates 172, the resin quickly flows along the resin return plates 172 into the resin recovery tanks 171, and then into the resin recovery box. The several resin return plates 172 and the resin recovery tanks 171 work together to achieve rapid recovery of resin throughout the entire yarn movement path.

[0066] In this embodiment, there are four adhesive recovery tanks 171, four adhesive recovery bins, and six adhesive return plates 172. In other embodiments, the specific number of adhesive recovery tanks, adhesive recovery bins, and adhesive return plates is not limited, as long as rapid recovery of resin adhesive can be achieved.

[0067] Once the resin in the resin recovery tank reaches a certain volume, it can be pumped back into the impregnation tank 124 of the impregnation device 120 by a resin pump to impregnate the yarn, thus realizing the recycling and reuse of the resin. The reason for pumping the recovered resin back into the impregnation tank 124 of the impregnation device 120 instead of the winding impregnation tank 147 of the winding device 140 is that when the winding device 140 is running, the winding claw 143 will continuously rotate around the mandrel in a vertical plane, thereby driving the yarn to rotate. This allows the yarn in the lower half of the winding claw 143 to be fully impregnated in the winding impregnation tank 147 and then rotate upwards, thereby winding onto the mandrel. During this process, since the yarn on the winding claw 143 is always moving in a vertical plane, when the yarn continues to rotate upwards after being impregnated with resin, the excess resin on the yarn will drip into the winding impregnation tank 147. Therefore, the resin in the winding impregnation tank 147 is consumed at a slower rate. If the recovered resin is pumped back into the winding impregnation tank 147, it will result in too much resin in the winding impregnation tank 147, which will hinder the movement of the yarn and may lead to problems such as fiber breakage.

[0068] The winding forming equipment 100 also includes several threading plates for combing the yarn. These threading plates are vertically arranged and parallel to each other along the length of the frame 110. Each threading plate has a through hole in its center for fitting a mandrel, and the diameter of the through hole is larger than the diameter of the mandrel. When the threading plate is fitted around the mandrel, the yarn can be evenly threaded through the gap between the threading plate and the mandrel, ensuring that the yarn is evenly wrapped around the mandrel in a circumferential direction. This maximizes the prevention of yarn knotting during the winding process and ensures uniform wall thickness of the wound hollow insulating tube.

[0069] The winding molding equipment 100 also includes several yarn guide plates, which are vertically arranged on the first frame 111 and located on the outside of the mandrel fixing device 130. After the yarn is divided into several parts by the yarn separating plate 123, it passes through several yarn guide plates in sequence, so that the several parts of yarn can further smoothly transition around the mandrel fixing device. At the same time, excess resin liquid can be squeezed out of the yarn, so as to avoid excessive resin liquid when the yarn is wrapped around the outer periphery of the mandrel, which would affect the product quality.

[0070] In another embodiment, this application provides a tube forming production line for manufacturing hollow tube products. Along the forming direction of the product, it sequentially includes a yarn-laying device, a yarn-laying pre-forming device, and a forming device for curing the yarn impregnated with adhesive into the product. Specifically, the hollow tube product can be a pultruded tube or a wound tube.

[0071] In one embodiment, when used to manufacture filament-wound tubes, the tube forming production line is a filament-wound forming production line for manufacturing filament-wound products. Along the forming direction of the filament-wound product, the filament-wound forming production line sequentially includes a yarn-laying device for placing yarn, a yarn-winding forming device 100 for winding yarn, and a forming device for curing the impregnated yarn into a filament-wound product. The yarn-winding forming device 100 is a pre-forming device.

[0072] In this winding molding equipment 100, several yarns are placed on the yarn-laying device. After being drawn out by the yarn-laying device, the yarns enter the resin-impregnation device 120 to be impregnated with resin before entering the winding device 140. The winding molding equipment 100 is as described above and will not be repeated here.

[0073] The molding device includes a heating device, an outer mold and a core mold. One end of the core mold is fixed on the core mold fixing device 130, and the other end is inserted into the mold cavity of the outer mold after passing through two winding devices 140 in sequence. A tubular channel is formed between the core mold and the cavity wall. The heating device is set outside the outer mold. The yarn passes through the tubular channel and is heated and cured to form a wound product.

[0074] The winding molding production line also includes a traction device that provides traction force and a cutting device for cutting the wound products. The traction device includes two alternating clamping traction mechanisms that can continuously form wound products within a certain distance. The clamping traction mechanism includes a sliding gripper slidably connected to the frame 110 and a moving gripper that can move vertically. The two grippers are arranged facing each other. A hydraulic cylinder drives the moving gripper, which can move vertically, to move downward so that the moving gripper and the sliding gripper cooperate to clamp the wound products. The sliding gripper can slide on the frame 110, allowing the clamping traction mechanism to slide on the frame 110, thereby causing the wound products clamped by the two grippers to move synchronously with the clamping traction mechanism.

[0075] The cutting device includes a following mechanism and a cutting mechanism mounted on the following mechanism for cutting the wound product. The following mechanism includes a base and a clamping mechanism disposed on the base. The clamping mechanism clamps the wound product, allowing the entire following mechanism to move synchronously with the wound product. The cutting mechanism is fixedly connected to the base, enabling the cutting mechanism to move synchronously with the following mechanism, thus achieving synchronous cutting.

[0076] The pultrusion winding production line also includes a control system, which controls all process parameters during the pultrusion winding production process and provides feedback on the actual results. During operation, the control system maintains a fixed ratio between the set traction speed and the set winding speed of the pultruded product in a linked state, ensuring that the pultrusion and winding speeds are matched and guaranteeing product quality. Furthermore, the pultrusion winding production line is equipped with several sensors to measure the actual forward speed and actual winding speed of the pultruded product. When the ratio between the actual forward speed and actual winding speed deviates from the ratio between the set traction speed and the set winding speed, the control system automatically adjusts the winding speed and issues a speed difference alarm, preventing problems such as yarn accumulation, mold blockage, or even production line shutdown caused by mismatched pultrusion and winding speeds.

[0077] In this embodiment, the feedback control method for the winding speed is a semi-closed-loop control method. That is, the actual winding speed is obtained by detecting the rotation speed of the winding disk 142 and compared in the control system to achieve closed-loop control. Compared with the full closed-loop control method that uses angular velocity, it can effectively reduce costs while meeting control accuracy.

[0078] When the winding molding production line is running, the fibers first need to be impregnated with resin for pre-forming. Specifically, the yarn on the yarn-laying device is impregnated with resin in the impregnation device 120 and then laid along the axial direction of the core mold to form an axial layer on the outer periphery of the core mold. The winding yarn on the winding device 140 is impregnated with resin in the winding impregnation tank 147 and then wound around the outer periphery of the axial layer by the winding claws 144 to form a winding layer. The felt on the felt-laying device 160 is impregnated with resin in the felt roll impregnation tank 163 and then formed into a cylindrical shape by the felt guide to cover the outer periphery of the winding layer, thus obtaining a preform. Then, the preform enters the tubular channel between the outer mold and the core mold of the molding device and is cured at high temperature to obtain the winding product. The two clamping and traction mechanisms of the traction device alternately advance to continuously traction the winding product, so that the yarn with completed layup continuously enters the molding device, and the cured winding product is continuously pulled out of the molding device and moves forward, with uninterrupted production. The cutting device cuts the winding product according to the required size.

[0079] The winding production line of this application realizes the automated production of winding products, reduces labor costs, and has high production efficiency.

[0080] In another embodiment, when used to manufacture pultruded tubes, the tube forming production line is a pultrusion molding production line used to manufacture pultruded products. Since pultruded tubes are pure axial yarn lay-ups without winding layers, compared to the above-mentioned pultrusion winding molding production line, the pultrusion molding production line does not require a winding device, and the rest of the structure is the same, so it will not be described again here.

[0081] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A pipe forming production line for manufacturing hollow pipe products, characterized in that, Along the forming direction of the product, the device includes, in sequence, a yarn-laying device for placing yarn, a pre-forming device for laying the yarn, and a forming device for curing the yarn impregnated with adhesive into the product. The preforming device includes: a frame and an impregnation device for wetting the yarn and a core mold fixing device for fixing the core mold arranged sequentially along the length of the frame, wherein the core mold fixing device is disposed on the frame; The impregnation device includes an impregnation frame and a yarn collecting plate, an impregnation tank, and several yarn separating plates arranged sequentially along the length of the frame. The yarn is sequentially drawn out from the yarn-making device, passed through the yarn-collecting plate, introduced into the impregnation tank, divided into several parts and passed through several yarn-dividing plates respectively, bypassing the core mold fixing device and gradually approaching the core mold from the outside of the core mold and evenly covering the outer periphery of the core mold to form an axial layer, and then entering the molding device for curing. The impregnation tank is a V-shaped groove, and an impregnation frame is provided on the impregnation tank. The impregnation frame is fitted to the inner bottom surface of the impregnation tank and is set with a certain gap. The impregnation frame includes a plurality of impregnation rollers, which are arranged in a V-shape along the length of the frame at the bottom of the impregnation tank. The yarn is sequentially threaded through the gap between the plurality of impregnation rollers and the inner bottom surface of the impregnation tank, thereby realizing the introduction of the yarn into the impregnation tank. There are two yarn separating plates, which are arranged vertically at the end of the impregnation frame near the core mold fixing device. The two yarn separating plates are arranged opposite each other at a certain angle, and the opening direction of the angle is towards the yarn collecting plate.

2. The pipe forming production line as described in claim 1, characterized in that, The preforming device further includes several threading plates, which are vertically arranged on the frame and distributed in parallel along the length of the frame. Each threading plate has a through hole in its center for fitting the core mold, and the diameter of the through hole is larger than the diameter of the core mold. The yarn is evenly threaded in the gap between the threading plate and the core mold, so that the yarn evenly covers the outer periphery of the core mold in a circumferential direction.

3. The pipe forming production line as described in claim 1, characterized in that, The preforming device also includes several yarn guide plates, which are vertically arranged on the frame and located on the outside of the core mold fixing device. The yarn is divided into several parts and passes through several yarn guide plates in sequence to bypass the core mold fixing device.

4. The pipe forming production line as described in claim 1, characterized in that, The preforming device also includes a winding device. The impregnation device, the core mold fixing device, and the winding device are arranged sequentially along the length of the frame. The winding device includes a winding motor, a winding disc, and a winding claw, which are sequentially sleeved on the outer periphery of the core mold. The winding disc is used to hold the winding yarn. The winding disc is provided with a plurality of first yarn guide holes. The winding claw is provided with at least one third yarn guide hole. The winding motor drives the winding device to rotate, thereby causing the winding yarn to be wound around the outer periphery of the axial layer to form a winding layer.

5. The pipe forming production line as described in claim 4, characterized in that, The winding yarn is sequentially led out from the first yarn guide hole, passes through the third yarn guide hole, and is wound around the outer periphery of the axial layer.

6. The pipe forming production line as described in claim 5, characterized in that, The winding device further includes a yarn guide assembly sleeved on the outer periphery of the mandrel. The yarn guide assembly is disposed between the winding disc and the winding claw. The yarn guide assembly includes at least one yarn guide plate, and the yarn guide plate is provided with a plurality of second yarn guide holes.

7. The pipe forming production line as described in claim 6, characterized in that, The winding yarn is sequentially led out from the first yarn guide hole, passes through the second yarn guide hole, passes through the third yarn guide hole, and is wound around the outer periphery of the axial layer.

8. The pipe forming production line as described in claim 7, characterized in that, The winding claw includes a winding frame, several winding rods, and several winding elements. The winding frame is sleeved on the outer periphery of the mandrel. The several winding rods are evenly arranged on the outer side of the winding frame along the radial direction. The winding elements are evenly arranged on the outer side of the winding frame along the axial direction. The winding rods are provided with the third yarn guide hole, and the winding elements are provided with at least one fourth yarn guide hole.

9. The pipe forming production line as described in claim 8, characterized in that, The winding yarn is sequentially led out from the first yarn guide hole, passes through the second yarn guide hole, passes through the third yarn guide hole, passes through the fourth yarn guide hole, and is wound around the outer periphery of the axial layer.

10. The pipe forming production line as described in claim 9, characterized in that, The winding disc has a winding through hole at its center. Several thread guides are provided on the side of the winding disc near the yarn guide assembly. The several thread guides are evenly arranged in a circumferential direction around the winding through hole on the inner side of the winding disc. The thread guides include a thread guide frame and several thread guide rods.

11. The pipe forming production line as described in claim 10, characterized in that, The winding yarn is sequentially led out from the first yarn guide hole, passes through the yarn guide, passes through the second yarn guide hole, passes through the third yarn guide hole, passes through the fourth yarn guide hole, and is wound around the outer periphery of the axial layer.

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