Body roundness correction, sizing, welding and sealing fiber reinforced composite pipe joint and manufacturing equipment and manufacturing method of body roundness correction, sizing, welding and sealing fiber reinforced composite pipe joint

Abstract

The invention discloses a body roundness correction, sizing, welding and sealing fiber reinforced composite pipe joint and manufacturing equipment and a manufacturing method, and relates to the field of plastic composite pipes, the body roundness correction, sizing, welding and sealing fiber reinforced composite pipe joint comprises a composite pipe joint body and fiber reinforced plastics, and the composite pipe joint body is composed of a plastic sealing section and a composite pipe end; according to the body roundness-correcting, sizing, welding and sealing fiber-reinforced composite pipe joint, the manufacturing equipment and the manufacturing method, through an extrusion mode, heating is carried out while the inner wall of the pipe end is inserted into the inner mold, the outer wall of the pipe end is sleeved with the extruded pipe end, under precise sizing of the inner mold and the outer mold at the hot melting temperature, the sizing pipe end is corrected again, and the standard roundness and the pipe diameter size are generated; in addition, under the dual effects of heating the bottom template and extruding the inner layer body plastic and the outer layer body plastic, the end face of the all-plastic sealing pipe forms a closed pipe end face, and therefore the use requirement is fully met.

Description

TECHNICAL FIELD

[0001] The present application relates to plastic composite pipe technology, in particular to a body roundness correction, sizing, welding, sealing fiber reinforced composite pipe joint and manufacturing equipment and manufacturing method. BACKGROUND

[0002] Continuous fiber winding reinforced plastic composite pipe has been widely used in many fields such as water supply, heat supply, heating, gas supply and so on due to its high pressure resistance, light weight and low cost. The composite pipe is usually composed of a plastic inner tube, a fiber core layer pipe and a plastic outer tube, wherein the fiber pipe core layer uses high melting plastic to impregnate continuous fibers, and the inner tube plastic layer and the outer tube plastic layer are made of low melt index plastic. Due to the great difference in melt strength of the plastic used in different layers, the multi-layer separation problem frequently occurs during production and use, which brings many serious consequences to the normal operation of the pipeline system.

[0003] The separated pipe end of the multi-layer pipe is easy for the transported liquid or gas to enter the separation layer. This makes the pipe end unable to withstand normal pressure, and further leads to rupture failure, which seriously affects the safety and stability of the pipeline system and may cause leakage accidents, causing damage to the surrounding environment and facilities.

[0004] The present application aims at the problems existing in the prior art. By extruding, the pipe end inner wall socket and the outer wall outer mold are sleeved on the extruded pipe end while heating. At the hot melting temperature, the inner and outer molds are accurately sized, the pipe end is corrected and sized, the standard roundness and pipe diameter size are generated, and the pipe fitting socket use requirements are met. At the same time, under the action of the huge extrusion force, the plastic inner layer, the fiber core layer and the plastic outer layer of the pipe end are re-bonded to form a dense pipe segment, realizing that the three layers simultaneously bear the axial tensile stress and meeting the use requirements. In addition, by directly removing the core layer fiber layer through the equipment, under the double action of the heating bottom mold plate and the extruded inner and outer layer body plastic, the all-plastic sealed pipe end face forms a closed pipe end face, meeting the use requirements. The present application also provides two ways of factory mode and installation site production, respectively realizing continuous and rapid production of roundness correction, welding and sealing pipe end, and meeting the repair, reconstruction and diversion use requirements, effectively solving the problems existing in the prior art, and having significant innovation and practicality. SUMMARY

[0005] The purpose of the present application is to provide a body roundness correction, sizing, welding, sealing fiber reinforced composite pipe joint and manufacturing equipment and manufacturing method, to solve the problems of multi-layer pipe separation pipe end, the transported liquid or gas is easy to enter the separation layer; this makes the pipe end unable to withstand normal pressure, and further leads to rupture failure, which seriously affects the safety and stability of the pipeline system and may cause leakage accidents, causing damage to the surrounding environment and facilities.

[0006] In order to achieve the above object, the present application provides the following technical scheme: a fiber-reinforced composite pipe joint with body circle correction, diameter correction, fusion and sealing, comprising a composite pipe joint body and fiber-reinforced plastic, wherein the composite pipe joint body is composed of a plastic sealing section and a composite pipe end;

[0007] It should be noted that the length of the composite pipe joint body is greater than or equal to the required interface length of the socket fusion of the same pressure grade pipe fitting.

[0008] Further, the manufacturing method of the plastic sealing section is as follows: first, the fiber core layer is removed to a depth of 1-10 mm by a fiber removal machine, then the remaining plastic layer inside and outside the pipe end body is heated in an oven, and then the closed plastic section is formed by cold extrusion through an end mold.

[0009] Further, the length of the composite pipe end is 60-200 mm, and the manufacturing method of the composite pipe end is as follows: after being heated to a molten state in an oven, the composite pipe end head is subjected to the combined action of the socket extrusion inner mold and the outer mold, the inner inflation of the inner mold socket inflates the inner wall of the composite pipe end head to correct the circle of the composite pipe end head, and the outer mold socket and outer wall of the composite pipe end head are subjected to diameter correction of the composite pipe end head with a standard outer diameter circumference size, and under the combined action of the inflation force of the inner inflation mold and the extrusion force of the outer holding mold, the fiber-reinforced plastic composite pipe end head is fused with the fiber-reinforced layer to form a composite pipe end, and the composite pipe end and the plastic sealing section of the pipe end body form a composite pipe joint body.

[0010] Further, the fiber-reinforced plastic comprises an independently laid continuous fiber prepreg layer, a long fiber reinforced plastic layer, and a laminated layer of the continuous fiber prepreg layer and the long fiber reinforced plastic layer.

[0011] A manufacturing device for a fiber-reinforced composite pipe joint with body circle correction, diameter correction, fusion and sealing, comprising a factory manufacturing platform, wherein the factory manufacturing platform is provided with a first platform for removing the core layer fiber and pipe end heating and a second platform for extrusion cooling and shaping;

[0012] A pair of clamping rollers are arranged to roll up and down on the composite pipe end, and the pair of clamping rollers are arranged at the rear end of the first platform;

[0013] A pair of clamping molds are arranged at the rear end of the second platform, and the front end of the pair of clamping molds is provided with a first core rod mold, a first concentric circle outer mold and a first flat plate mold, and the first core rod mold and the first concentric circle outer mold are fixedly connected into a cooling and shaping first integrated mold through the first flat plate mold; the front end of the first integrated mold is connected with a hydraulic station thrust device for moving the first integrated mold forward and backward;

[0014] A support roller is arranged at the front end of the pair of clamping molds, and a fiber removal machine that can move up and down is arranged above the support roller, and the support roller is used to support and rest the fiber removal machine;

[0015] An oven is used to heat the end of the composite tube, and the oven is located at the front end of the fiber rejection machine.

[0016] A manufacturing equipment for fiber-reinforced composite pipe joints that performs body rounding, sizing, welding, and sealing also includes an installation site fabrication platform, which is manufactured by modifying a thermoplastic pipe butt welding machine fabrication platform.

[0017] An electric worm gear, on which a cutting tool drive motor is connected, is mounted at the rear end of a bracket on the docking machine fabrication platform;

[0018] The front end of the cutting tool drive motor is provided with a second mandrel mold, a second concentric outer mold, and a second flat plate mold. The second mandrel mold and the second concentric outer mold are fixedly connected by the second flat plate mold to form a second integral mold for heating, cooling, and shaping. The second integral mold for heating, cooling, and shaping is independently fitted on the support of the docking machine manufacturing platform and can be freely tilted and moved. The front end of the second integral mold is provided with a clamping Haval mold, which is fixed at one end on the support of the docking machine manufacturing platform. The front end of the clamping Haval mold is connected to a hydraulic workstation that drives the composite pipe end to move back and forth.

[0019] A method for manufacturing a fiber-reinforced composite pipe joint manufacturing equipment for body rounding, sizing, welding, and sealing includes the following steps:

[0020] Step 1: Place the end of the composite tube to be made on the support of the factory production platform, and then press the clamping rollers onto the end of the composite tube; it should be noted that: the fiber removal machine is placed on the platform support frame and the drive motor is started to drive the removal blade to rotate.

[0021] Step 2: Start the clamping roller to rotate, pushing the composite tube end forward so that the tube end is aligned with the rotating cutter; at the same time, start the fiber removal machine and peel off the continuous fiber core layer to a depth of 1-10mm;

[0022] Step 3: Move the fiber removal machine upward to clear the forward passage of the composite tube end; continue to rotate the clamping rollers to push the composite tube end forward, so that the tube end enters the interior of the heating oven and is continuously heated until the plastic is in a molten state;

[0023] Step 4: The backward rolling action rotates the clamping rollers, causing the composite tube end to move backward, so that the tube end is removed from the heating oven and transported horizontally from the first platform surface to the second platform surface; the hydraulic station is activated to push the first integral mold for cooling and shaping to move backward;

[0024] Step 5: Insert the mandrel mold into the interior of the first mandrel mold, the first concentric outer mold, and the first flat mold at the end of the composite pipe to generate a standard outer diameter size, and squeeze the plastic body at the pipe end to seal the pipe end face;

[0025] Step Six: Allow the tube to cool naturally to room temperature. The tube end is then shaped to form a round, fixed-length, sealed, and three-layer fused composite tube end. Start the hydraulic station to move the first integral mold, which has been cooled and shaped, forward and remove the first integral mold from the composite tube end.

[0026] A method for manufacturing equipment for body rounding, sizing, welding, and sealing fiber-reinforced composite pipe joints further includes the following steps:

[0027] Step 1: Place the end of the continuous fiber reinforced plastic pipe on the side of the docking machine platform support; and use multiple sets of fixing clamps to fix the end of the continuous fiber reinforced plastic pipe on the docking machine platform support, leaving a length of 200-500mm.

[0028] Step 2: Turn on the chipper drive motor to drive the electric worm gear device, and push the chipper device forward to gradually approach the pipe end; at the same time, turn on the chipper device, and under the push of the electric worm gear and chipper drive motor, slowly move forward to remove the fiber layer of the core layer of the continuous fiber reinforced plastic pipe end, with a chipping depth of 1-10mm, to generate a pipe end with inner and outer plastic body layers.

[0029] Step 3: Turn on the chipper drive motor to drive the electric worm gear device, which will drive the chipper to retract to the bottom; place the heating mold system consisting of inner mold, outer mold and heating base plate on the hydraulic rod, and set the heating temperature to 260-300℃ and keep it at that temperature for 20 minutes.

[0030] Step 4: Start the hydraulic station. Under the action of the hydraulic pipe and hydraulic cylinder, the hydraulic rod is pushed forward, which in turn drives the heating mold system forward. While heating, the inner mold is inserted into the interior of the second mandrel mold, the second concentric outer mold, and the second flat mold. The pressure of the hydraulic station is 6-8 MPa.

[0031] Step 5: Under the dual conditions of heating temperature of 260-300℃ and hydraulic station pressure of 6-8MPa, the inner mold and outer mold play the role of rounding the end of the composite pipe, and the heating base plate plays the role of melting the inner and outer plastic layers of the body. Under the action of the inner and outer molds, the plastic closed pipe end face is fused to form a sealing surface layer.

[0032] Step 6: Turn off the heating switch and maintain pressure until natural cooling for 20-30 minutes to generate the composite tube end; restart the hydraulic station and use the hydraulic pipe and hydraulic cylinder to drive the hydraulic rod and heating mold system to remove the composite tube end; and open multiple sets of fixing clamps that fix the composite tube end to clamp and fix it.

[0033] Compared with existing technologies, this invention provides a fiber-reinforced composite pipe joint and its manufacturing equipment and method for body rounding, sizing, welding, and sealing. Through extrusion, while heating, an inner mold for inserting the inner wall of the pipe end and an outer mold for sealing the extruded pipe end are fitted onto the pipe end. Under the precise sizing conditions of the inner and outer molds at the hot-melt temperature, the sizing pipe end is recalibrated, generating standard roundness and pipe diameter dimensions to meet the requirements for pipe fitting insertion. Simultaneously, under the action of huge extrusion pressure, the inner plastic layer, fiber core layer, and outer plastic molten layer of the pipe end are re-bonded to form a dense pipe section, enabling all three layers to simultaneously withstand axial tensile stress, meeting usage requirements. Furthermore, after directly removing the core fiber layer through the equipment, under the dual action of heating the bottom template and extruding the inner and outer plastic body layers, a fully plastic sealed pipe end face is formed, meeting usage requirements. This invention also provides two methods: factory mode and on-site installation, respectively achieving continuous and rapid production of rounding, welding, and sealing pipe ends, and meeting the requirements for repair, modification, and rerouting. It effectively solves the problems existing in the prior art and has significant innovation and practicality. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0035] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Composite pipe fitting body; 11. Plastic sealing section; 12. Composite pipe end. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] As attached Figure 1 As shown:

[0040] Example 1:

[0041] This invention provides a fiber-reinforced composite pipe joint for body rounding, sizing, welding, and sealing, comprising a composite pipe joint body 1 and fiber-reinforced plastic, wherein the composite pipe joint body 1 is composed of a plastic sealing section 11 and a composite pipe end 12;

[0042] It should be noted that the length of the composite pipe fitting body 1 is greater than or equal to the required interface length for socket welding of pipe fittings of the same pressure rating.

[0043] The present invention further details the manufacturing method of the plastic sealing section 11, which involves first removing the fiber core layer to a depth of 1-10mm using a fiber removal machine, then heating the remaining inner and outer plastic layers of the tube end body in an oven, and finally cold-extending it through an end mold to form a closed plastic section; the length of the composite tube end 12 is 60-200mm, and the manufacturing method of the composite tube end 12 involves heating it in an oven to a molten state, and then, under the combined action of the inner and outer molds of the insertion extrusion, the inner mold inserts into the inner wall of the inner expansion composite tube end 12 to round the composite tube end 12. The outer mold is used to insert and wrap around the outer wall of the composite pipe end 12, and the composite pipe end 12 is sized according to the standard outer diameter circumference. Under the combined action of the internal expansion force of the inner expansion mold and the extrusion force of the outer mold, the inner and outer plastic layers of the fiber reinforced plastic composite pipe end 12 are fused with the fiber reinforcement layer to form the composite pipe end 12, which together with the plastic sealing section 11 of the pipe end body constitutes the composite pipe joint body 1; the fiber reinforced plastic includes independently laid continuous fiber prepreg tape layer, long fiber reinforced plastic layer, and laminated layer of continuous fiber prepreg tape layer and long fiber reinforced plastic layer.

[0044] Working principle: The composite pipe joint body 1 is composed of a plastic sealing section 11 and a composite pipe end 12, and the length of the composite pipe joint body 1 is greater than or equal to the required interface length for socket welding of pipe fittings of the same pressure level.

[0045] First, a fiber core layer of 1-10mm is removed using a fiber removal machine. This process removes some of the fiber core layer that may affect the sealing effect. The remaining inner and outer plastic layers of the pipe end are then heated in an oven to soften them to a suitable state. Next, the pipe is cold-extruded using an end die. During this process, the plastic layers undergo plastic deformation under the action of the end die, ultimately forming a closed plastic segment, creating the plastic sealing segment 11. This achieves a fully plastic sealed pipe end face, preventing the transported liquid or gas from entering the separation layer.

[0046] The length of the composite pipe end 12 is 60-200mm. This length range is determined according to the actual use requirements and the pipe fitting socket requirements to ensure a good connection effect.

[0047] After the composite pipe end 12 is heated to a molten state in an oven, it is processed under the combined action of an inner and outer die for extrusion. The inner die inserts into the inner wall of the expanding composite pipe end 12, applying an outward expansion force to round the end, reducing the ellipticity deviation of the pipe end cross-section and achieving standard roundness. The outer die inserts into and hugs the outer wall of the composite pipe end 12, sizing the end to a standard outer diameter circumference to ensure that the outer diameter of the pipe end meets the dimensional requirements of the fitting socket.

[0048] Under the combined action of the internal expansion force of the internal expansion mold and the extrusion force of the external clamping mold, the inner and outer plastic layers and the fiber reinforcement layer of the fiber-reinforced plastic composite pipe end 12 fuse together at the hot melt temperature. As the plastic layers reach a molten state due to heating, under the action of enormous extrusion force, the molten plastic re-bonds, forming a dense pipe section. This allows the inner plastic layer, fiber core layer, and outer plastic layer to simultaneously withstand axial tensile stress, meeting the usage requirements. The final composite pipe end 12 is formed, and together with the plastic sealing section 11 of the pipe end body, constitutes the composite pipe joint body 1.

[0049] Fiber-reinforced plastics include independently laid continuous fiber prepreg tape layers, long fiber reinforced plastic layers, and laminates of continuous fiber prepreg tape layers and long fiber reinforced plastic layers. This multi-layer structure design fully utilizes the characteristics of different fiber reinforcement materials, improving the overall performance of the composite pipe joint body 1, such as enhancing the joint's strength, pressure resistance, and stability.

[0050] With the above technical solution, the length of the composite pipe joint body 1 is greater than or equal to the required interface length for socket welding of pipe fittings of the same pressure level. This design ensures that the composite pipe joint body 1 can provide sufficient connection length when it is welded with the pipe fitting socket, effectively enhancing the stability and reliability of the connection, greatly reducing the risk of connection failure due to insufficient connection length, and improving the safety and stability of the entire pipeline system.

[0051] The plastic sealing section 11 is manufactured by first removing the fiber core layer to a depth of 1-10mm using a fiber removal machine, then heating the remaining inner and outer plastic layers of the pipe end body in an oven, and finally cold-extruded them through an end mold to form a sealed plastic section. This unique manufacturing method enables the plastic sealing section 11 to form a fully sealed plastic pipe end face, effectively preventing the transported liquid or gas from entering the separation layer, avoiding the problem of pipe end failure due to pressure inability, and providing strong protection for the safe operation of the pipeline network system.

[0052] Precise sizing with inner and outer molds at hot-melt temperature can recalibrate the sizing pipe ends, generating standard roundness and pipe diameter dimensions. This effectively solves the problem of excessive ellipticity deviation of the pipe end cross-section in multi-layer pipe separation, ensuring that an oversized size will not prevent the insertion of socket fittings, and an undersized size will not cause the hot-melt contact surface to fail to make contact and lose the hot-melt effect. This avoids failures such as water leakage and air leakage, greatly improving the feasibility and reliability of pipeline installation.

[0053] Under the action of huge extrusion pressure, the plastic inner layer, fiber core layer and plastic outer layer of the pipe end are re-bonded to form a dense pipe section, which enables the three layers to bear axial tensile stress at the same time, meets the usage requirements, and solves the problem that the fiber reinforcement layer and plastic outer layer are not stressed synchronously after the pipe end and fitting are welded together, and the plastic outer layer cannot withstand the axial tensile force and breaks and fails. This enhances the tensile performance and overall strength of the pipe.

[0054] Fiber-reinforced plastics comprise independently laid continuous fiber prepreg layers, long fiber reinforced plastic layers, and laminates of continuous fiber prepreg layers and long fiber reinforced plastic layers. This multi-layered fiber-reinforced plastic structure fully leverages the advantages of different fiber materials, improving the overall performance of the composite pipe joint body 1. This results in higher strength, better corrosion resistance, and a longer service life, enabling it to better meet the application requirements of various fields such as water supply, heating, and gas supply.

[0055] Example 2:

[0056] This embodiment is basically the same as the previous embodiment, except that a manufacturing equipment for a fiber-reinforced composite pipe joint that performs body rounding, sizing, welding, and sealing includes a factory manufacturing platform. The factory manufacturing platform is equipped with a first platform for removing core fiber and heating the pipe end, and a second platform for extrusion cooling and shaping.

[0057] The clamping rollers are used to roll the composite tube end 12 up and down, and the clamping rollers are arranged at the rear end of the first platform;

[0058] The clamping mold is located at the rear end of the second platform. The front end of the clamping mold is provided with a first mandrel mold, a first concentric outer mold, and a first flat plate mold. The first mandrel mold and the first concentric outer mold are fixedly connected by the first flat plate mold to form a first integral mold for cooling and shaping. The front end of the first integral mold is connected to a hydraulic station thrust device for moving the first integral mold back and forth.

[0059] A support roller is provided at the front end of the clamping mold, and a fiber rejection machine that can move up and down is provided above the support roller. The support roller is used to support and place the fiber rejection machine.

[0060] An oven is used to heat the composite tube end 12, and the oven is located at the front end of the fiber rejection machine;

[0061] A method for manufacturing a fiber-reinforced composite pipe joint manufacturing equipment for body rounding, sizing, welding, and sealing includes the following steps:

[0062] Step 1: Place the composite tube end 12 to be made on the support of the factory production platform, and then press the clamping rollers onto the composite tube end 12; it should be noted that: the fiber removal machine is placed on the platform support frame and the drive motor is started to drive the removal blade to rotate.

[0063] Step 2: Start the clamping roller to rotate, pushing the composite tube end 12 forward so that the tube end is aligned with the rotating cutter; at the same time, start the fiber removal machine and peel off the continuous fiber core layer to a depth of 1-10mm;

[0064] Step 3: Move the fiber removal machine upward to clear the forward passage of the composite tube end 12; continue to rotate the clamping rollers to push the composite tube end 12 forward, so that the tube end enters the interior of the heating oven and is continuously heated until the plastic is in a molten state;

[0065] Step 4: The backward rolling action rotates the clamping rollers, causing the composite tube end 12 to move backward, so that the tube end is removed from the heating oven and transported horizontally from the first platform surface to the second platform surface; the hydraulic station is activated to push the first integral mold that has been cooled and shaped to move backward;

[0066] Step 5: Insert the mandrel mold into the interior of the first mandrel mold, the first concentric outer mold, and the first flat mold of the composite pipe end 12 to generate a standard outer diameter size, and squeeze the plastic body at the pipe end to seal the pipe end face;

[0067] Step 6: Allow the tube to cool naturally to room temperature. The shaped tube end will form a round, fixed-length, sealed, and three-layer fused composite tube end 12. Start the hydraulic station to drive the first integral mold that has been cooled and shaped forward, and move the first integral mold out of the composite tube end 12.

[0068] Working principle: Located at the rear end of the first platform, it is used to roll the composite tube end 12 up and down. By starting the rotation of the clamping roller, the composite tube end 12 is pushed forward, so that the tube end is aligned with the rotating cutter, preparing for the removal of the fiber core layer; in subsequent processing, the continuous rotation of the clamping roller can push the composite tube end 12 to move between different stations to achieve continuous processing;

[0069] Fiber Removal Machine: Located above the support rollers, which support and hold the fiber removal machine. The fiber removal machine is lowered onto the platform support frame, and the drive motor is started to rotate the removal blade. When the composite tube end 12 is aligned with the removal blade by the clamping rollers, the fiber removal machine is started. The removal blade rotates and peels off the continuous fiber core layer to a depth of 1-10mm, generating a tube end with inner and outer plastic layers. After processing, the fiber removal machine is moved upwards to allow the composite tube end 12 to advance.

[0070] Oven: Located at the front end of the fiber rejection machine, it is used to heat the composite tube end 12. The clamping rollers are continuously rotated, pushing the composite tube end 12 forward so that the tube end enters the interior of the heating oven and is continuously heated to the molten state of the plastic, providing conditions for subsequent extrusion molding and three-layer fusion.

[0071] The clamping mold is located at the rear end of the second platform. The front end of the clamping mold includes a first mandrel mold, a first concentric outer mold, and a first flat mold. The first mandrel mold and the first concentric outer mold are fixedly connected by the first flat mold to form a first integral mold for cooling and shaping. After the composite tube end 12 is removed from the heating oven and transported horizontally to the second platform surface, the hydraulic station is activated to push the first integral mold for cooling and shaping backward, preparing for the insertion of the mandrel mold. The mandrel mold is inserted into the interior of the first mandrel mold, the first concentric outer mold, and the first flat mold of the composite tube end 12, generating a standard outer diameter and extruding the plastic body at the tube end to seal the tube end face. After natural cooling to room temperature, the shaped tube end is formed into a round, sized, sealed, three-layer fused composite tube end 12. Then, the hydraulic station is activated to move the first integral mold for cooling and shaping forward, removing the first integral mold from the composite tube end 12, completing the processing of the composite tube end 12 on the factory manufacturing platform.

[0072] The above technical solution includes a first platform for removing core fibers and heating the tube end, and a second platform for extrusion cooling and shaping. This partitioned setup makes the manufacturing process more orderly and efficient. A clamping roller, located at the rear end of the first platform, is used to roll the composite tube end 12 up and down, accurately controlling its movement and position, providing a stable foundation for subsequent fiber removal and heating operations.

[0073] The clamping mold is located at the rear end of the second platform, and its front end is equipped with a first mandrel mold, a first concentric outer mold, and a first flat plate mold. These are fixedly connected by the first flat plate mold to form a first integral mold for cooling and shaping. This integral mold design makes the extrusion cooling and shaping process more precise and stable, ensuring the dimensional accuracy and quality stability of the composite pipe joint body 1. The hydraulic station thrust device connected to the front end of the first integral mold enables precise control of the forward and backward movement of the first integral mold, meeting the needs of different manufacturing stages.

[0074] The support roller is positioned at the front end of the clamping mold, above which is a vertically movable fiber rejecting machine. The support roller provides a stable support platform for the fiber rejecting machine, enabling smooth fiber rejecting operations and improving production efficiency and accuracy. The drying oven is positioned at the front end of the fiber rejecting machine, facilitating heating of the composite tube end 12 and making the entire production process more compact and efficient.

[0075] Step 1: Place the composite tube end 12 to be manufactured on the support of the factory manufacturing platform, clamp the clamping rollers, lower and start the fiber rejection machine to prepare for subsequent operations. The operation process is clear and reasonable. Step 2: Start the clamping rollers to rotate and push the composite tube end 12 forward to align with the rejection blade. At the same time, start the fiber rejection machine to peel off the continuous fiber core layer, realizing the automated operation of fiber rejection and improving rejection efficiency and accuracy.

[0076] Step 3: The fiber removal machine moves upward to clear the forward passage, continuously pushing the composite tube end 12 into the heating oven and heating it to a molten state, preparing for subsequent extrusion and shaping. Step 4: The backward rolling clamping rollers move the composite tube end 12 out of the oven and transport it horizontally. The hydraulic station is activated to push the first integral mold backward. The operation is closely linked, ensuring the continuity of the production process.

[0077] Step five involves inserting the mandrel mold into the relevant mold to generate a standard outer diameter and pressing the plastic body at the pipe end to seal the pipe end face, thus achieving precise forming and sealing of the composite pipe end 12. Step six involves activating the hydraulic station after natural cooling and shaping to move the first integral mold forward and out, completing the entire manufacturing process. The resulting composite pipe end 12 has the advantages of being round, dimensionally accurate, sealed, and having three layers of fusion, meeting the requirements for high-quality manufacturing.

[0078] Example 3:

[0079] This embodiment is basically the same as the previous embodiment, except that the manufacturing equipment for a fiber-reinforced composite pipe joint that performs body rounding, sizing, welding, and sealing also includes an installation site fabrication platform, which is modified and manufactured by a thermoplastic pipe butt welding machine fabrication platform.

[0080] An electric worm gear, on which a cutting tool drive motor is connected, is mounted at the rear end of a bracket on the docking machine fabrication platform;

[0081] The front end of the cutting tool drive motor is provided with a second mandrel mold, a second concentric outer mold, and a second flat plate mold. The second mandrel mold and the second concentric outer mold are fixedly connected by the second flat plate mold to form a second integral mold for heating, cooling, and shaping. The second integral mold for heating, cooling, and shaping is independently fitted on the support of the docking machine manufacturing platform and can be freely tilted and moved. The front end of the second integral mold is provided with a clamping Haval mold, which is fixed at one end on the support of the docking machine manufacturing platform. The front end of the clamping Haval mold is connected to a hydraulic workstation that drives the composite pipe end 12 to move back and forth.

[0082] A method for manufacturing equipment for body rounding, sizing, welding, and sealing fiber-reinforced composite pipe joints further includes the following steps:

[0083] Step 1: Place the end of the continuous fiber reinforced plastic pipe on the side of the docking machine platform support; and use multiple sets of fixing clamps to fix the end of the composite pipe 12 to the support of the docking machine platform, leaving a length of 200-500mm.

[0084] Step 2: Turn on the chipper drive motor to drive the electric worm gear device, and push the chipper device forward to gradually approach the pipe end; at the same time, turn on the chipper device, and under the push of the electric worm gear and chipper drive motor, slowly move forward to remove the fiber layer of the core layer of the continuous fiber reinforced plastic pipe end, with a chipping depth of 1-10mm, to generate a pipe end with inner and outer plastic body layers.

[0085] Step 3: Turn on the chipper drive motor to drive the electric worm gear device, which will drive the chipper to retract to the bottom; place the heating mold system consisting of inner mold, outer mold and heating base plate on the hydraulic rod, and set the heating temperature to 260-300℃ and keep it at that temperature for 20 minutes.

[0086] Step 4: Start the hydraulic station. Under the action of the hydraulic pipe and hydraulic cylinder, the hydraulic rod is pushed forward, which in turn drives the heating mold system forward. While heating, the inner mold is inserted into the interior of the second mandrel mold, the second concentric outer mold, and the second flat mold. The pressure of the hydraulic station is 6-8 MPa.

[0087] Step 5: Under the dual conditions of heating temperature of 260-300℃ and hydraulic station pressure of 6-8MPa, the inner mold and outer mold serve to round the composite pipe end 12, and the heating base plate serves to melt the inner and outer plastic layers of the body. Under the action of the inner and outer molds, the plastic closed pipe end face is fused to form a sealing surface layer.

[0088] Step 6: Turn off the heating switch and maintain pressure until natural cooling for 20-30 minutes to generate composite tube end 12; restart the hydraulic station and use the hydraulic pipe and hydraulic cylinder to drive the hydraulic rod and heating mold system to remove composite tube end 12; and open multiple sets of fixing clamps that fix composite tube end 12 to clamp and fix it.

[0089] Working Principle: An electric worm gear is connected to a cutting tool drive motor, which is located at the rear end of the support on the butt-jointing machine's fabrication platform. Activating the cutting tool drive motor drives the electric worm gear, propelling the cutting machine forward towards the tube end. Simultaneously, the cutting machine, propelled by the electric worm gear and cutting tool drive motor, slowly moves forward, removing the fiber layer of the continuous fiber-reinforced plastic tube end core to a depth of 1-10mm, resulting in a tube end with both inner and outer plastic layers. After processing, activating the cutting tool drive motor again drives the electric worm gear, causing the cutting machine to retract completely.

[0090] Heating mold system: Composed of inner mold, outer mold, and heating base plate, placed on a hydraulic rod. The heating temperature is set to 260-300℃ and held for 20 minutes to allow the heating mold system to reach a suitable working temperature. The hydraulic station is activated, pushing the hydraulic rod forward through the hydraulic pipes and cylinders, which in turn moves the heating mold system forward. While heating, the inner mold is inserted into the second mandrel mold, the second concentric outer mold, and the second flat mold. The pressure of the hydraulic station is 6-8 MPa. Under the dual conditions of a heating temperature of 260-300℃ and a hydraulic station pressure of 6-8 MPa, the inner and outer molds function to round the composite tube end 12, and the heating base plate melts the inner and outer plastic layers of the body. Under the action of the inner and outer molds, the plastic sealing tube end face is fused to form a sealing surface layer.

[0091] Clamping Haval Mold: Located at the front end of the heating mold system, fixed to one end of the docking machine's fabrication platform support. During the processing of the composite pipe end 12 by the heating mold system, the clamping Haval mold plays an auxiliary role in fixing and positioning, ensuring processing accuracy. After processing, the heating switch is turned off, and pressure is maintained until natural cooling for 20-30 minutes to generate the composite pipe end 12. The hydraulic station is restarted, and the hydraulic rod is driven by the hydraulic pipe and hydraulic cylinder to withdraw the composite pipe end 12 from the heating mold system. Multiple sets of fixing clamps for the composite pipe end 12 are opened to clamp and fix it, completing the processing of the composite pipe end 12 into a platform at the installation site.

[0092] By setting up the above technical solution and modifying the thermoplastic pipe butt welding machine manufacturing platform, existing equipment resources are fully utilized and manufacturing costs are reduced. The electric worm gear is connected to the cutter drive motor, which is set at the rear end of the bracket on the butt welding machine manufacturing platform. This structure makes the drive and movement of the cutter more flexible and accurate, and can meet the needs of removing fibers from the composite pipe end 12 at the installation site.

[0093] The second mandrel mold, the second concentric outer mold, and the second flat mold, all located at the front end of the cutting tool drive motor, are fixedly connected to form a second integral mold for heating, cooling, and shaping. This mold is independently mounted on the support of the docking machine's fabrication platform and can be freely tilted and moved. This design allows the second integral mold to be flexibly adjusted and operated on-site according to actual needs, improving the equipment's applicability and convenience. The clamping Haval mold at the front end of the second integral mold, fixed to one end of the docking machine's fabrication platform support, provides stable clamping and positioning for the composite pipe end 12, ensuring smooth fabrication. The hydraulic workstation connected to the front end of the clamping Haval mold, which drives the composite pipe end 12 to move back and forth, provides power support for the movement of the composite pipe end 12, making on-site fabrication operations more efficient and convenient.

[0094] Step 1: Place the end of the continuous fiber-reinforced plastic tube on the side of the docking machine platform support and fix it with a fixing clamp, leaving a certain length to provide a stable foundation and sufficient operating space for subsequent operations. Step 2: Turn on the cutting blade drive motor and the cutting machine device to remove the fiber layer; the operation is simple and efficient.

[0095] Step 3: Activate the cutter drive motor to move the cutter backward, place the heating mold system on the hydraulic rod, and set the heating temperature and holding time to prepare for subsequent heating and fusion operations. Step 4: Start the hydraulic station to push the heating mold system forward and insert it into the relevant mold. Operate under the set pressure to ensure the uniformity and stability of heating and extrusion.

[0096] Step 5: Under the dual conditions of heating temperature and hydraulic station pressure, the inner and outer molds function to round the pipe, while the heating base plate melts it. Under the action of the inner and outer molds, the end face of the plastic sealed pipe is fused to form a sealing surface layer, thus achieving on-site repair and modification of the composite pipe end 12. Step 6: After turning off the heating switch and allowing it to cool naturally under pressure, the heating mold system is removed and the fixing clamps are opened, completing the entire on-site fabrication process. The fabricated composite pipe end 12 meets the requirements for repair, modification, and rerouting.

[0097] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A body round, sizing, fusion, sealing fiber reinforced composite pipe joint, characterized in that, The composite pipe joint body (1) is composed of a plastic sealing section (11) and a composite pipe end (12).

2. The fiber reinforced composite pipe joint of claim 1, wherein, The plastic sealing section (11) is manufactured by removing the fiber core layer to a depth of 1-10 mm with a fiber removal machine, heating the remaining plastic layer of the pipe end body with an oven, and then cold extruding the pipe end body with an end mold to form a closed plastic section.

3. The fiber reinforced composite pipe joint of claim 1, wherein, The composite pipe end (12) has a length of 60-200 mm, and is manufactured by heating the composite pipe end head to a molten state with an oven, and then expanding the molten composite pipe end head in an inner expansion mold and an outer mold under the combined action of the inner expansion force and the outer extrusion force of the molds to fuse the plastic layer and the fiber reinforced layer to form the composite pipe end (12), and then combining the composite pipe end (12) with the plastic sealing section (11) of the pipe end body to form the composite pipe joint body (1).

4. The fiber reinforced composite pipe joint of claim 1, wherein, The fiber reinforced plastic includes an independently laid continuous fiber prepreg tape layer, a long fiber reinforced plastic layer, and a laminated layer of the continuous fiber prepreg tape layer and the long fiber reinforced plastic layer.

5. The manufacturing apparatus for a fiber reinforced composite pipe joint of body straightening, diameter setting, fusion, sealing according to any one of claims 1 to 4, characterized in that, The factory manufacturing platform is provided with a first platform for removing the fiber core layer and heating the pipe end, and a second platform for extruding, cooling, and shaping. A pair of clamping rollers are arranged at the rear end of the first platform to roll the composite pipe end (12) up and down. A pair of clamping molds are arranged at the rear end of the second platform, and the front end of the pair of clamping molds is provided with a first core rod mold, a first concentric circle outer mold, and a first flat plate mold, which are fixedly connected into a first integrated mold for cooling and shaping through the first flat plate mold. A support roller is arranged at the front end of the pair of clamping molds, and a fiber removal machine that can move up and down is arranged above the support roller to support and rest the fiber removal machine. An oven is arranged at the front end of the fiber removal machine to heat the composite pipe end (12).

6. The manufacturing apparatus for a fiber reinforced composite pipe joint of body straightening, diameter setting, fusion, sealing according to any one of claims 1 to 4, wherein The installation site manufacturing platform is manufactured by modifying the butt joint machine manufacturing platform of the thermoplastic pipe material. An electric worm gear is arranged at the rear end of the support bracket of the butt joint machine manufacturing platform, and a cutter driving motor is connected to the electric worm gear. The front end of the cutter driving motor is provided with a second core rod mold, a second concentric circle outer mold, and a second flat plate mold, which are fixedly connected into a second integrated mold for heating and cooling and shaping.

7. The method of claim 5, wherein the apparatus further comprises a heating device for heating the outer surface of the pipe to be joined. The following steps are included: Step one: the end of the composite pipe (12) to be made is placed on the support of the factory production platform, and the clamping roller is buckled on the end of the composite pipe (12); Step two: start rotating the clamping roller to push the end of the composite pipe (12) to move forward to align the pipe end with the rotating cutter; at the same time, start the fiber removing machine and peel off the continuous fiber core layer to a depth of 1-10 mm; Step three: move the fiber removing machine upward to leave a passage for the end of the composite pipe (12) to move forward; continue to rotate the clamping roller to push the end of the composite pipe (12) to move forward, so that the pipe end enters the inside of the heating oven and continues to be heated to a molten state of plastic; Step four: retreat the rotating clamping roller to drive the end of the composite pipe (12) to move backward, so that the pipe end moves out of the heating oven and is transferred from the first platform surface to the second platform surface; start the hydraulic station to push the first integrated mold for cooling and shaping to retreat; Step five: insert the core rod mold into the inside of the first core rod mold, the first concentric outer mold and the first flat plate mold of the end of the composite pipe (12) to generate a standard outer diameter size, and extrude the plastic body of the pipe end to close the pipe end surface; Step six: naturally cool to room temperature, and the shaped pipe end generates a round, fixed-size, closed and three-layer fused end of the composite pipe (12); start the hydraulic station to drive the first integrated mold for cooling and shaping to move forward, and move the first integrated mold out of the end of the composite pipe (12).

8. The method of claim 6, wherein the apparatus further comprises a heating device for heating the outer surface of the pipe to be joined. Further comprising the following steps: Step one: place the end of the continuous fiber reinforced plastic pipe on the side end of the butt joint machine platform support; and use a plurality of fixed clamps for fixing the end of the composite pipe (12) to fix the end of the continuous fiber reinforced plastic pipe on the support of the butt joint machine platform, leaving a length of 200-500 mm; Step two: start the cutter drive motor to drive the electric worm gear device to push the removing machine device to move forward and gradually approach the pipe end; at the same time, start the removing machine device to slowly move forward under the push of the electric worm gear and the cutter drive motor, remove the fiber layer of the core layer of the end of the continuous fiber reinforced plastic pipe, the removal depth is 1-10 mm, and generate an end of the pipe with inner and outer plastic layers; Step three: start the cutter drive motor to drive the electric worm gear device to drive the removing machine to retreat to the bottom; place the heating mold system composed of an inner mold, an outer mold and a heating base plate on the hydraulic rod, and set the heating temperature to 260-300℃ for 20 minutes; Step four: start the hydraulic station to push the hydraulic rod forward through the action of the hydraulic pipe and the hydraulic cylinder, and then drive the heating mold system to move forward, insert the inner mold into the inside of the second core rod mold, the second concentric outer mold and the second flat plate mold while heating, and the pressure of the hydraulic station is 6-8 MPa; Step five: under the double conditions of heating temperature of 260-300℃ and hydraulic station pressure of 6-8 MPa, the inner mold and the outer mold play the role of correcting the roundness of the end of the composite pipe, the heating base plate plays the role of melting the inner and outer plastic layers, and a sealing surface layer is generated by melting and fusing the plastic to close the pipe end surface under the action of the inner and outer molds; Step six: turn off the heating switch, and keep pressure until natural cooling for 20-30 minutes to generate the composite pipe end (12); start the hydraulic station again, and drive the hydraulic rod and the heating mold system out of the composite pipe end (12) through the hydraulic pipe and the hydraulic cylinder; and open a plurality of fixing clamps for fixing the composite pipe end (12) to clamp and fix it.

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