Large-section fiber reinforced composite pipe production line and production process

Abstract

The application discloses a large-section fiber reinforced composite pipe production line and a production process, which comprises a fixed yarn frame, a yarn threading and glue dipping frame, a preforming mold frame, a forming mold and a traction device. The traction device is matched with an inner clamp assembly. The inner clamp assembly is arranged in the formed composite pipe. The inner clamp assembly is connected with a long rod. The long rod reversely passes through the forming mold and the preforming mold frame from the inside of the formed composite pipe. The end of the long rod passing through the preforming mold frame is connected with a first driving source. During production, the yarn is sequentially threaded through the yarn threading and glue dipping frame, the preforming mold frame, the forming mold and the traction device. The yarn is preformed after passing through the yarn threading and glue dipping frame and the preforming mold frame, and the composite pipe is formed after passing through the forming mold. The inner clamp assembly is arranged in the composite pipe and the traction device. The formed composite pipe is clamped and pulled by the traction device. The application avoids the deformation or damage of the composite pipe caused by the traction device during clamping and pulling, and ensures the production of the large-section composite pipe with qualified quality.

Description

Technical Field

[0001] This invention belongs to the field of fiber composite pipe production technology, and relates to a large-section fiber-reinforced composite pipe production line and production process. Background Technology

[0002] Fiberglass reinforced plastic (FRP) is a composite material using glass fiber or its products (mat, yarn, etc.) as reinforcement. It boasts advantages such as light weight, high strength, good corrosion resistance, and excellent insulation, leading to its increasingly widespread application. Pultrusion is a commonly used molding process for this composite material. The basic process involves the fiber-reinforced material being impregnated with resin, placed in a preforming device, and cured in a thermoforming mold under external force to obtain a profile product, which is then cut to a specific length according to usage requirements.

[0003] In the prior art, CN120645479A discloses a production line and process for co-extruded profiles, including a positioning yarn separating frame, a yarn threading and impregnation frame, a mold fixing area, a preforming mold frame, and a forming mold, as well as traction equipment and cutting equipment. The above technical solution involves threading yarn, felt, and galvanized steel sheet together into the forming mold for heating and curing to obtain a profile with high strength. For profiles that are plate-shaped or have steel plates added to increase strength, the profiles after passing through the forming mold can be pressed and pulled by the traction equipment, allowing for continuous production. However, for large-section composite pipes, if the traction equipment is used to press the formed profiles directly, it will cause deformation or damage to the pipes, making it impossible to produce qualified large-section composite pipes.

[0004] Therefore, there is an urgent need for a large-section fiber-reinforced composite pipe production line and production process to solve the above-mentioned technical problems. Summary of the Invention

[0005] This invention proposes a production line and process for large-section fiber-reinforced composite pipes, which effectively solves the problems in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a large cross-section fiber-reinforced composite pipe production line, comprising a fixed yarn frame for placing yarn rolls and releasing yarn, wherein a yarn threading and impregnation frame, a pre-forming mold frame, a forming mold, and a traction device are sequentially arranged at one end of the fixed yarn frame for releasing yarn, the yarn threading and impregnation frame is arranged between the pre-forming mold frame and the fixed yarn frame, the forming mold is fixed on the placement table, and the pre-forming mold frame is connected to the yarn entry end of the forming mold;

[0007] The traction device is equipped with an inner clamping assembly, which is placed inside the formed composite pipe. When the traction device clamps and pulls the formed composite pipe, the inner clamping assembly supports the inner wall of the composite pipe.

[0008] The inner clamping assembly is connected to a long rod, which passes through the forming mold and the preforming mold frame from the inside of the formed composite pipe in the opposite direction. One end of the long rod that extends out of the preforming mold frame is connected to a first driving source. The first driving source can drive the inner clamping assembly to move with the traction device through the long rod.

[0009] Furthermore, a yarn separating frame is provided at one end of the preforming mold frame away from the forming mold, and the yarn separating frame is provided with a plurality of first yarn threading holes.

[0010] Furthermore, the preforming mold frame includes a first frame connected to the forming mold and a plurality of yarn-threading plates arranged parallel to the first frame. A hollow tube is provided in the middle of the first frame, which passes through the plurality of yarn-threading plates in sequence. The end of the hollow tube away from the fixed yarn frame is connected to the end face of the forming mold. The long rod passes through the middle of the hollow tube.

[0011] Furthermore, the forming mold includes a mold base fixed on the placement table, a first mold core disposed inside the mold base, and multiple pairs of electromagnetic coil heating plates disposed on the outer wall of the mold base; the first mold core passes through the mold base, and one end of the first mold core extends out of the mold base and is connected to a yarn-threading plate adjacent to the first frame; a second mold core is disposed inside the end of the first mold core away from the preforming mold frame, and the multiple pairs of electromagnetic coil heating plates surround the position of the second mold core.

[0012] Furthermore, the traction device includes two gantry traction units; the two gantry traction units are arranged one after the other according to the direction of composite pipe conveying and operate alternately.

[0013] Furthermore, each of the gantry traction units is equipped with an inner clamping assembly; wherein the long rod connected to the inner clamping assembly on the side opposite to the forming mold can pass through the inner clamping assembly on the side closer to the forming mold.

[0014] Furthermore, the inner clamp assembly includes an upper support body and a lower support body that are slidably connected. One end of the lower support body is connected to a second drive source, and the long rod is connected to the lower support body. The second drive source is connected to a lifting component disposed between the upper support body and the lower support body. When supporting the inner wall of the formed composite pipe, the second drive source can drive the lifting component to lift the upper support body.

[0015] Furthermore, vertical plates are fixed on both sides of the lower support body, and a sliding pin is fixed at the upper end of the vertical plate. The upper support body has waist-shaped holes on both sides for the sliding pin to sink into, and the upper support body can move up and down along the sliding pin through the waist-shaped holes.

[0016] Furthermore, the lifting assembly includes a connecting plate connected to the second driving source and a sliding bar connected to the connecting plate. The sliding bar is disposed between the upper support body and the lower support body. The upper side of the sliding bar is provided with a plurality of trapezoidal protrusions arranged at equal intervals, and the bottom surface of the upper support body is provided with a plurality of inverted trapezoidal protrusions arranged at equal intervals to cooperate with the trapezoidal protrusions.

[0017] The present invention also proposes a production process, including the above-mentioned large-section fiber-reinforced composite pipe production line, comprising the following steps:

[0018] Step S1: Install the yarn roll onto the fixed yarn frame, and pass the yarn through the yarn threading and dipping frame, the pre-forming mold frame, the forming mold and the traction device in sequence;

[0019] Step S2: The yarn is pulled, and after passing through the yarn threading and impregnation frame and the preforming mold frame, it is preformed and then heated and cured into a composite tube after passing through the forming mold.

[0020] Step S3: When the composite pipe to be formed is pulled to the traction device, quickly place the inner clamp assembly in the middle of the composite pipe, connect it with the long rod, and then place it in the traction device.

[0021] Step S4: The formed composite pipe is clamped and pulled by the traction equipment to continuously produce composite pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In this invention, an inner clamping assembly is provided in the traction device. When the traction device clamps and pulls the formed composite pipe, the inner clamping assembly can support the inner wall of the formed composite pipe, so as to avoid deformation or damage to the composite pipe caused by the traction device during clamping and pulling, and ensure that qualified large-section composite pipes can be produced.

[0024] In this invention, two gantry traction units can alternately clamp and pull the formed composite pipe. At the same time, the internal clamping assembly can be driven by the first drive source and the long rod to follow the movement of the gantry traction unit, maintaining continuous clamping and pulling of the composite pipe and improving production efficiency. Attached Figure Description

[0025] Figure 1 This is an overall perspective view of the present invention;

[0026] Figure 2 This is a schematic diagram showing the fit between the preforming mold frame and the forming mold in this invention;

[0027] Figure 3 This is a perspective view of the gantry traction unit in this invention;

[0028] Figure 4 This is a cross-sectional axonometric view of the preforming mold frame and the forming mold in this invention;

[0029] Figure 5 This is a schematic diagram of the long rod connection in this invention;

[0030] Figure 6 This is a perspective view of the inner clamping assembly in this invention;

[0031] Figure 7 This is a cross-sectional axonometric view of the inner clamping assembly in this invention;

[0032] Figure 8 This is a cross-sectional front view of the inner clamping assembly in this invention;

[0033] Figure 9 This is a cross-sectional view of the composite pipe after molding in this invention.

[0034] Figure 10 This is a cross-sectional schematic diagram of the elongated body formed on the inner wall of the composite pipe in this invention.

[0035] In the diagram: 1. Fixed yarn frame; 3. Pre-forming mold frame; 301. First frame; 302. Yarn threading plate; 303. Hollow tube; 4. Forming mold; 401. Mold base; 402. First mold core; 403. Electromagnetic coil heating plate; 404. Second mold core; 5. Traction device; 501. Gantry traction unit; 6. Placement platform; 7. Internal clamp assembly; 701. Upper support; 702. Lower support. 703, Second drive source; 704, Lifting assembly; 705, Vertical plate; 706, Sliding pin; 707, Waist-shaped hole; 7041, Connecting plate; 7042, Sliding strip; 7043, Trapezoidal boss; 7044, Inverted trapezoidal boss; 7011, Horizontal plate; 7012, Vertical plate; 7013, Abutting plate body; 7014, Horizontal plate; 8, Long rod; 9, First drive source; 10, Yarn separating frame. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] like Figures 1 to 3As shown, this invention proposes a large-section fiber-reinforced composite pipe production line, including a fixed yarn frame 1, a yarn threading and impregnation frame, a pre-forming mold frame 3, a forming mold 4, and a traction device 5. The forming mold 4 is installed on a placement platform 6. Several fixed yarn frames 1 can be provided according to the forming requirements of the composite profile. Yarn rolls or felt rolls are placed on the fixed yarn frames 1, and yarn can be released from them. The released yarn can pass sequentially through the yarn threading and impregnation frame, the pre-forming mold frame 3, and the forming mold 4. The yarn threading and impregnation frame is located between the pre-forming mold frame 3 and the fixed yarn frame 1. The pre-forming mold frame 3 is connected to the yarn entry end of the forming mold 4. The placement platform 6 is a workbench composed of profiles and plates, used to support the placement of the forming mold 4.

[0039] First of all, it needs to be explained that, such as Figure 9 As shown, the length and width of the formed composite pipe cross-section are 300-400mm, and as... Figure 10 As shown, additional structures can be formed on the inner wall, specifically irregularly shaped and hollow elongated strips extending along the length of the composite pipe. These strips can be installed on the upper and lower inner walls. The cross-sectional shape, size, and number of these strips can be designed according to the specific application scenario of the composite pipe. An inner clamping assembly 7 is used in conjunction with the traction device 5. This assembly is placed inside the formed composite pipe. When the traction device 5 clamps and pulls the formed composite pipe, the inner clamping assembly 7 supports the inner wall of the composite pipe, preventing deformation or damage during clamping and pulling, thus ensuring the production of high-quality large-section composite pipes.

[0040] Furthermore, the traction device 5 needs to reciprocate to clamp and pull the formed composite pipe. Therefore, in order to make the inner clamping assembly 7 move with the traction device 5, the inner clamping assembly 7 is connected to a long rod 8. The long rod 8 passes through the forming mold 4 and the preforming mold frame 3 from the inside of the formed composite pipe in the opposite direction. One end of the long rod 8 that passes out of the preforming mold frame 3 is connected to a first drive source 9. The first drive source 9 can drive the inner clamping assembly 7 to move reciprocally in the traction direction of the composite pipe through the long rod 8, so that it can move with the traction device 5.

[0041] In this embodiment, as Figure 2 , Figure 4As shown, a yarn separating frame 10 is provided at one end of the preforming mold frame 3 away from the forming mold 4. The yarn separating frame 10 includes a support placed on the ground and a plate on the upper part of the welded support. Multiple first yarn-passing holes are opened on the plate. A certain number of yarns can be separated from the yarn released from the fixed yarn frame 1 by passing through the first yarn-passing holes on the plate. Furthermore, multiple yarn separating frames 10 of different sizes can be set between the fixed yarn frame 1 and the preforming mold frame 3, and they are mirror-distributed on both sides of the preforming mold frame 3 to ensure that the released yarns enter the preforming mold frame 3 evenly. Of course, the plate and the first yarn-passing hole structure can be directly replaced by a woven mesh to achieve the same effect.

[0042] In this embodiment, the preforming mold frame 3 includes a first frame 301 connected to the forming mold 4 and multiple threading plates 302 arranged parallel to the first frame 301. Each threading plate 302 has a second threading hole for the yarn to pass through. A hollow tube 303 is arranged in the middle of the first frame 301, which passes through the multiple threading plates 302 in sequence. The end of the hollow tube 303 facing away from the fixed yarn frame 1 is connected to the end face of the forming mold 4. The long rod 8 passes through the middle of the hollow tube 303. The shape of the second threading hole can be circular, strip-shaped, etc. The shape and number of the second threading holes on different threading plates 302 are also different. When the yarn enters from the second threading hole on the first threading plate 302 and exits from the second threading hole on the last threading plate 302, the yarn is pre-uniformly gathered into the shape of a composite tube when it enters the forming mold 4, which prepares for the subsequent heating and curing of the forming mold 4, so that the wall thickness of the formed composite tube is uniform and the production quality of the composite tube is guaranteed.

[0043] The first frame 301 is a frame welded from shaped steel or profiles, and the threading plate 302 and hollow tube 303 are both set in the frame. The edge of the threading plate 302 is welded with a connecting strip, and the two ends of the connecting strip are connected to the first frame 301 by bolts. A window for the hollow tube 303 to pass through is opened in the middle of the threading plate 302. A support plate is set at the end of the hollow tube 303 away from the forming mold 4. The two sides of the support plate are welded to the first frame 301. A window for the end of the hollow tube 303 to pass through is opened in the middle of the support plate. A protruding strip is fixed to the window by bolts. The end of the hollow tube 303 is fixed to the protruding strip by bolts. There is a certain gap between the outer side of the end of the hollow tube 303 and the window of the support plate to allow the yarn to pass through. A support rod is connected to the end of the first frame 301 to support the preforming mold frame 3. Furthermore, the forming mold 4 is also equipped with a mold rod, which extends out of the forming mold 4 and passes through the yarn-threading plate 302. The end of the mold rod is connected to one of the yarn-threading plates 302. The mold rod cooperates with a specific second yarn-threading hole on the yarn-threading plate 302, so that the hollow strip in the composite profile is pre-formed.

[0044] In this embodiment, as Figure 2 , Figure 4 As shown, the molding die 4 includes a die base 401 fixed on the placement table 6, a first die core 402 disposed inside the die base 401, and multiple pairs of electromagnetic coil heating plates 403 disposed on the outer wall of the die base 401; the first die core 402 penetrates the die base 401, and one end of the first die core 402 is connected to the yarn-threading plate 302 adjacent to the first frame 301; a second die core 404 is disposed inside the end of the first die core 402 away from the pre-forming die frame 3, and the multiple pairs of electromagnetic coil heating plates 403 surround the position of the second die core 404; the die rod extends all the way to the second die core 404. The second mold core 404 supports the interior of the first mold core 402. A support rod is fixed to the end face of the second mold core 404 by bolts, which also supports the long rod 8 that passes through the forming mold 4. The yarn passes through the gap between the first mold core 402 and the mold base 401, and with the cooperation of the first mold core 402, the long rod 8 and the mold base 401, a cross-sectional device of the composite tube is formed. Under the traction of the traction device 5, it slowly passes through multiple pairs of electromagnetic coil heating plates 403 to heat and solidify the yarn, and the formed composite tube is discharged from the other end of the mold base 401.

[0045] The first mold core 402 is a hollow cuboid. The end of the hollow tube 303 is bolted to the end face of the first mold core 402. A support tube is provided inside the first mold core 402. The support tube is a thin-walled sheet metal part and is connected to the inner end face of the first mold core 402 near the hollow tube 303. After the long rod 8 passes through the hollow tube 303, it enters the first mold core 402 from the end of the first mold core 402 and passes through the support tube. Then it passes through the second mold core 404 and exits the forming mold 4. The support tube and the second mold core 404 can support the long rod 8 and prevent the long rod 8 from drooping due to its own weight and contacting the newly solidified composite pipe, thereby improving the production quality of the composite pipe.

[0046] In this embodiment, as Figure 3As shown, the traction device 5 includes two gantry traction units 501. The two gantry traction units 501 are arranged back and forth in the direction of composite pipe conveying and operate alternately. The gantry traction unit 501 can reciprocate in the direction of composite pipe conveying. When tractioning the formed composite pipe, one gantry traction unit 501 first clamps and pulls the composite pipe, and the other gantry traction unit 501 returns to the end close to the forming mold 4. After the first gantry traction unit 501 pulls the composite pipe for a certain distance, it releases the composite pipe, and the other gantry traction unit 501 then clamps and pulls the composite pipe. The first gantry traction unit 501 returns to the end close to the forming mold 4, and so on, continuously clamping and pulling the formed composite pipe. It should be noted that the gantry traction unit 501 is existing technology. For example, the specific technical solution of the gantry traction unit 501 in a dual-station mechanical traction gantry pultrusion equipment with publication number CN118269385A can be used to achieve clamping and traction of the formed tube. It will not be described in detail here.

[0047] In this embodiment, each gantry traction unit 501 is equipped with an inner clamping assembly 7. The long rod 8 connected to the inner clamping assembly 7 on the side away from the forming mold 4 can pass through the inner clamping assembly 7 on the side closer to the forming mold 4. After the two gantry traction units 501 have finished clamping and pulling the composite pipe, the gantry traction unit 501 needs to return to the end closer to the forming mold 4. The gantry traction unit 501 no longer clamps the composite pipe and moves under its own drive structure. At the same time, the first drive source 9 drives the inner clamping assembly 7 to move with the gantry traction unit 501 through the long rod 8. Furthermore, when the gantry traction unit 501 clamps and pulls the composite pipe, the inner clamping assembly 7 moves synchronously with the clamping force of the gantry traction unit 501. In short, the inner clamping assembly 7 is always kept in the gantry traction unit 501.

[0048] In this embodiment, as Figures 5 to 8 As shown, the inner clamp assembly 7 includes an upper support body 701 and a lower support body 702 that are slidably connected. One end of the lower support body 702 is connected to a second drive source 703, and a long rod 8 is connected to the lower support body 702. The second drive source 703 is connected to a lifting assembly 704 disposed between the upper support body 701 and the lower support body 702. When supporting the upper inner wall of the formed composite pipe, the second drive source 703 can drive the lifting assembly 704 to lift the upper support body 701. When it is not necessary to support the inner wall of the formed composite pipe, the second drive source 703 drives the lifting assembly 704 to return to its original position, and the upper support body 701 falls along the lower support body 702, so that the upper support body 701 is separated from the upper inner wall of the composite pipe. Under the drive of the first drive source 9, the entire inner clamp assembly 7 can be moved.

[0049] In this embodiment, vertical plates 705 are fixed on both sides of the lower support 702, and sliding pins 706 are fixed at the upper ends of the vertical plates 705. The upper support 701 has oblong holes 707 on both sides for the sliding pins 706 to enter, allowing the upper support 701 to move up and down along the sliding pins 706 through the oblong holes 707. Both the upper support 701 and the lower support 702 include a horizontal plate 7011 and two parallel vertical plates 706 welded to the horizontal plate 7011. 12. Both ends of the two vertical plates 7012 are welded with horizontal plates 7014. The vertical plates 7012 in the upper support body 701 and the lower support body 702 are arranged opposite each other. The horizontal plates 7011 are provided with abutting plates 7013. The abutting plates 7013 of the upper support body 701 can abut against the upper side wall of the composite pipe, and the abutting plates 7013 of the lower support body 702 can abut against the lower side wall of the composite pipe. The abutting plates 7013 are provided with grooves for accommodating long strips.

[0050] In this embodiment, the lifting component 704 includes a connecting plate 7041 connected to the second driving source 703 and a sliding bar 7042 connected to the connecting plate 7041. The sliding bar 7042 is disposed between the upper support body 701 and the lower support body 702. The upper side of the sliding bar 7042 has multiple trapezoidal protrusions 7043 arranged at equal intervals, and the bottom surface of the upper support body 701 has multiple inverted trapezoidal protrusions 7044 arranged at equal intervals to cooperate with the trapezoidal protrusions 7043. Specifically, the inverted trapezoidal protrusions 7044 are formed on the lower end face of the vertical plate 7012. The second driving source 703 is a cylinder. The connecting plate 7041 is connected to a connector by bolts, and the other end of the connector is connected to the telescopic end of the cylinder by a threaded structure. Mounting holes are provided on the sliding bar 7042. The side of 41 is integrally formed with a limiting protrusion that is recessed into the mounting hole. The limiting protrusion is interference-fitted with the mounting hole. The second drive source 703 is fixed to the end horizontal plate 7014 by bolts. Both sides of the connecting plate 7041 are fitted with sliding strips 7042. When the telescopic end of the second drive source 703 extends, the trapezoidal boss 7043 on the sliding strip 7042 and the inverted trapezoidal boss 7044 on the upper support body 701 cooperate. The inclined surface of the trapezoidal boss 7043 slides along the inclined surface of the inverted trapezoidal boss 7044. Due to the restriction of the sliding pin 706 and the waist-shaped hole 707, the upper support body 701 is raised to contact and support the inner wall of the composite pipe, so as to avoid deformation or damage to the composite pipe when the traction device 5 clamps and pulls, and ensure that qualified large-section composite pipes can be produced.

[0051] In this embodiment, the first driving source 9 is a long cylinder, which is set at the yarn separating frame 10. There are two long cylinders, each corresponding to a long rod 8 and installed on the steel frame. At the bottom of the steel frame, there is a pressure-stabilizing air tank connected to the long cylinder. The long cylinder also works in conjunction with a control solenoid valve. When the inner clamping assembly 7 needs to be pulled by the long rod 8, the air circuit is switched on and off by the control solenoid valve. The long cylinder can control the piston rod to shorten. When the inner clamping assembly 7 is clamped and pulled by the gantry traction unit 501, the piston rod can be extended by pulling the long rod 8. Therefore, a two-position three-way solenoid valve can be used for control. Of course, other solenoid valves that can meet the control requirements can also be used.

[0052] Furthermore, the long rod 8 is constructed by welding together multiple short steel pipes. Due to its length, when another long rod 8 passes the first inner clamp assembly 7, it will sag under its own weight and pass between the two vertical plates 7012 of the lower support body 702 of the inner clamp assembly 7, allowing the long rod 8 to connect to the other inner clamp assembly 7. Moreover, the air pipe of the second drive source 703 is pre-inserted into the long rod 8 and exits from one end of the first drive source 9, connecting to the external solenoid valve and pressure-stabilizing air tank. A plate is welded to the end of the long rod 8 and connected to the vertical plate 7012 on the lower support body 702 by bolts.

[0053] In this embodiment, the yarn threading and impregnation frame is existing technology (not shown in the figure). For example, the yarn threading and impregnation frame disclosed in the production line and production process of co-extruded profile disclosed in CN120645479A can be used to impregnate the yarn conveyed by the fixed yarn frame 1, in preparation for heating and curing in the subsequent molding die 4. It will not be described in detail here.

[0054] When using the above technical solution:

[0055] First, the yarn roll is installed on the fixed yarn frame 1, and the yarn is passed through the yarn threading and impregnation frame, the pre-forming mold frame 3, the forming mold 4 and the traction device 5; the two gantry traction units 501 first pull the yarn, and after the yarn passes through the forming mold 4, it is heated and cured into a composite tube; then, the two inner clamping components 7 are placed in the two gantry traction units 501 one after the other.

[0056] Continuing with normal production, when the first gantry traction unit 501 clamps and pulls the formed composite pipe, the second drive source 703 drives the sliding bar 7042 to move through the connecting plate 7041, raising the upper support body 701. This causes the contact plate 7013 in the upper support body 701 to support the upper inner wall of the composite pipe. Subsequently, the first gantry traction unit 501 clamps and pulls the composite pipe. At the same time, the second gantry traction unit 501 is in the initial traction position. After the first gantry traction unit 501 finishes traction, the inner clamping assembly 7 in the second gantry traction unit 501 actuates and performs traction. At this time, the second drive source 703 in the first gantry traction unit 501, through the connecting plate 7041, moves the sliding bar 7042 to lift the upper support body 701. This causes the contact plate 7013 in the upper support body 701 to support the upper inner wall of the composite pipe. 1. Drive the sliding bar 7042 back to its original position, and the upper support 701 falls under its own weight, abutting the plate 7013 without contacting the upper inner wall of the composite pipe, so that the first gantry traction unit 501 can return to the initial traction position; in this way, the two gantry traction units 501 operate alternately in a cycle to achieve continuous clamping and traction of the composite pipe; finally, the produced composite pipe can be cut into pipes of equal length by an external cutting device; in this invention, when the traction device 5 clamps and pulls the formed composite pipe, the inner clamping assembly 7 can support the inner wall of the formed composite pipe, avoiding deformation or damage to the composite pipe caused by the traction device 5 during clamping and traction, and ensuring that qualified large-section composite pipes can be produced.

[0057] Example 2

[0058] This embodiment discloses a production process, including the large cross-section fiber-reinforced composite pipe production line of Embodiment 1, comprising the following steps:

[0059] Step S1: Install the yarn roll onto the fixed yarn frame 1, and pass the yarn through the yarn threading and dipping frame, the pre-forming mold frame 3, the forming mold 4 and the traction device 5 in sequence;

[0060] Step S2: The yarn is pulled and pre-formed after passing through the yarn threading and impregnation frame and the pre-forming mold frame 3. After passing through the forming mold 4, it is heated and cured to form a composite tube.

[0061] Step S3: When the composite pipe to be formed is pulled to the traction device 5, quickly place the inner clamp assembly 7 in the middle of the composite pipe, connect it with the long rod 8, and then place it in the traction device 5.

[0062] Specifically, slits are made on both sides of the composite pipe that has not yet passed the gantry traction unit 501. As the gantry traction unit 501 pulls, when the slit to be made passes the first gantry traction unit 501, the pulling is paused. When the first gantry traction unit 501 is raised, the inner clamp assembly 7 is quickly placed into the composite pipe through the slit and connected to the plate at the end of one of the long rods 8. Then, the gantry traction unit 501 continues to pull. When the slit moves to the second gantry traction unit 501, the pulling is paused, and the other inner clamp assembly 7 is quickly placed into the composite pipe through the slit and connected to the plate at the end of the other long rod 8.

[0063] Step S4: The formed composite pipe is clamped and pulled by the traction device 5 to continuously produce composite pipes;

[0064] Specifically, the two gantry traction units 501 in the traction device 5 alternately clamp and pull the formed composite pipe to realize the continuous production of composite pipe.

[0065] The large-section fiber-reinforced composite pipes produced using the manufacturing process provided in this embodiment will not be deformed during production, have a good shape, and have high production quality.

[0066] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A large cross-section fiber reinforced composite pipe production line characterized by: The device includes a fixed yarn frame (1) for placing and releasing yarn rolls. At one end of the fixed yarn frame (1) where the yarn is released, there are sequentially arranged a yarn threading and impregnation frame, a pre-forming mold frame (3), a forming mold (4), and a traction device (5). The yarn threading and impregnation frame is located between the pre-forming mold frame (3) and the fixed yarn frame (1). The forming mold (4) is fixed on a placement platform (6), and the pre-forming mold frame (3) is connected to the end of the forming mold (4) where the yarn enters. The traction device (5) is equipped with an inner clamp assembly (7), which is placed inside the formed composite pipe. When the traction device (5) clamps and pulls the formed composite pipe, the inner clamp assembly (7) supports the inner wall of the composite pipe. The inner clamp assembly (7) is connected to a long rod (8), which passes through the forming mold (4) and the preforming mold frame (3) from the inside of the formed composite pipe in the opposite direction. One end of the long rod (8) that passes through the preforming mold frame (3) is connected to a first drive source (9). The first drive source (9) can drive the inner clamp assembly (7) to follow the traction device (5) through the long rod (8).

2. Large cross-section fiber reinforced composite pipe production line according to claim 1, characterized in that: The preforming mold frame (3) is provided with a yarn separating frame (10) at one end away from the forming mold (4), and the yarn separating frame (10) is provided with a plurality of first yarn threading holes.

3. The large cross-section fiber reinforced composite pipe production line according to claim 1, characterized in that: The preforming mold frame (3) includes a first frame (301) connected to the forming mold (4) and a plurality of yarn-threading plates (302) arranged parallel to the first frame (301). A hollow tube (303) is provided in the middle of the first frame (301) and passes through the plurality of yarn-threading plates (302) in sequence. One end of the hollow tube (303) away from the fixed yarn frame (1) is connected to the end face of the forming mold (4). The long rod (8) passes through the middle of the hollow tube (303).

4. Large cross-section fiber reinforced composite pipe production line according to claim 3, characterized in that: The forming mold (4) includes a mold base (401) fixed on the placement platform (6), a first mold core (402) disposed inside the mold base (401), and multiple pairs of electromagnetic coil heating plates (403) disposed on the outer wall of the mold base (401); the first mold core (402) passes through the mold base (401), and one end of the first mold core (402) is connected to the yarn-threading plate (302) adjacent to the first frame (301). A second mold core (404) is disposed inside the end of the first mold core (402) away from the preforming mold frame (3), and multiple pairs of electromagnetic coil heating plates (403) surround the position of the second mold core (404).

5. The large cross-section fiber reinforced composite pipe production line of claim 1, wherein: The traction device (5) includes two gantry traction units (501); the two gantry traction units (501) are arranged in front and behind according to the direction of composite pipe conveying and operate alternately.

6. The large-section fiber-reinforced composite pipe production line according to claim 5, characterized in that: Each of the gantry traction units (501) is equipped with an inner clamping assembly (7); wherein the long rod (8) connected to the inner clamping assembly (7) on the side opposite to the forming mold (4) can pass through the inner clamping assembly (7) on the side close to the forming mold (4).

7. The large-section fiber-reinforced composite pipe production line according to claim 1 or 5, characterized in that: The inner clamp assembly (7) includes an upper support body (701) and a lower support body (702) that are slidably connected. One end of the lower support body (702) is connected to a second drive source (703), and the long rod (8) is connected to the lower support body (702). The second drive source (703) is connected to a lifting assembly (704) disposed between the upper support body (701) and the lower support body (702). When supporting the inner wall of the formed composite pipe, the second drive source (703) can drive the lifting assembly (704) to lift the upper support body (701).

8. The large-section fiber-reinforced composite pipe production line according to claim 7, characterized in that: The lower support (702) has vertical plates (705) fixed on both sides, and a sliding pin (706) is fixed at the upper end of the vertical plate (705). The upper support (701) has waist-shaped holes (707) on both sides for the sliding pin (706) to be inserted into. The upper support (701) can move up and down along the sliding pin (706) through the waist-shaped holes (707).

9. The large-section fiber-reinforced composite pipe production line according to claim 7, characterized in that: The lifting assembly (704) includes a connecting plate (7041) connected to the second drive source (703) and a sliding bar (7042) connected to the connecting plate (7041). The sliding bar (7042) is disposed between the upper support body (701) and the lower support body (702). The upper side of the sliding bar (7042) is provided with a plurality of trapezoidal bosses (7043) arranged at equal intervals, and the bottom surface of the upper support body (701) is provided with a plurality of inverted trapezoidal bosses (7044) arranged at equal intervals to cooperate with the trapezoidal bosses (7043).

10. A production process comprising the large-section fiber-reinforced composite pipe production line according to any one of claims 1-7, characterized in that, Includes the following steps: Step S1: Install the yarn roll on the fixed yarn frame (1), and pass the yarn through the yarn threading and impregnation frame, the pre-forming mold frame (3), the forming mold (4) and the traction device (5) in sequence. Step S2: The yarn is pulled and preformed after passing through the yarn threading and impregnation frame and the preforming mold frame (3). After passing through the forming mold (4), it is heated and cured to form a composite pipe. Step S3: When the composite pipe to be formed is pulled to the traction device (5), the inner clamp assembly (7) is quickly placed in the middle of the composite pipe and connected to the long rod (8) and then placed in the traction device (5). Step S4: The composite pipe is clamped and pulled by the traction device (5) to continuously produce composite pipe.

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