A PEEK strip continuous gradient bending-stitching tube making device and method

Abstract

The present invention discloses a device and method for forming PEEK tubes using a continuous, gradual bending and stitching process. These methods relate to the field of material forming. The device comprises a forming unit for converting the strip into a tube; a stitching unit for melting and bonding the contact seams of the tube; a heating unit for heating the forming and stitching units to a set temperature; and a support unit for mounting and supporting the forming, heating, and stitching units. Based on the device and method for forming PEEK tubes using a continuous, gradual bending and stitching process, the present invention enables continuous forming of PEEK tubes while effectively controlling energy consumption and heat input during the forming process.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic molding, in particular to a device and method for making a pipe of a PEEK strip material through continuous and gradual bending and sewing. Background Art

[0002] Due to their large size, existing space stations and large truss structures are typically transported via heavy-lift launch vehicles and assembled in orbit. However, this ground-based launch method limits the speed of space construction due to its difficulty, efficiency, and cost. Therefore, in-orbit manufacturing, with its high production efficiency, low cost, and rapid application, has become a trend in aerospace engineering for space station construction. Currently, spacecraft and truss structure materials are primarily metal and resin-based materials. Metals offer advantages such as high strength and low linear expansion coefficient, but their density is higher than that of resin-based materials, making resin-based materials the preferred material for spacecraft truss structures.

[0003] Polyetheretherketone (PEEK) is a high-performance thermoplastic with excellent thermal properties, high wear resistance, chemical resistance, and a wide range of machinability. It meets the requirements for the preparation and service of large trusses in space environments. The preparation of PEEK rods / pipes, the basic material of large trusses, is a key technical link. Existing PEEK pipes are mainly prepared through traditional processes such as extrusion and injection molding. Both require molding in the molten state of PEEK plastic, and after molding, the entire body needs to be cooled and shaped. The heat consumption is high and the molding cycle is long. Considering the particularity of the space environment, the use of traditional processes to prepare PEEK pipes is bound to cause many problems such as difficult thermal management and difficulty in cooling the completely melted plastic. Summary of the Invention

[0004] The purpose of the present invention is to provide a PEEK strip continuous gradual bending-stitching tube making device and method to solve the problems existing in the above-mentioned prior art. It can realize the continuous gradual bending forming and local small area melting and stitching of PEEK tubes at a lower temperature, and effectively control the energy consumption and heat input in the forming process.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a PEEK strip continuous gradual bending-stitching pipe-making device, comprising a molding unit, wherein the molding unit is used to transform the strip into a pipe; a stitching unit, wherein the stitching unit is used to melt and bond the contact seams of the pipe; a heating unit, wherein the heating unit is used to heat the molding unit and the stitching unit to a set temperature; and a support unit, wherein the support unit is used to install and support the molding unit, the heating unit and the stitching unit. The present invention utilizes the continuous feeding ability of PEEK glassy materials, the continuous gradual bending and deformation ability of the low-temperature high-elastic state, and the melting and stitching ability of local small areas to develop a PEEK strip continuous gradual bending-stitching pipe-making device and method, which is of great significance for the preparation of large truss basic units, the improvement of production efficiency, energy saving and thermal management.

[0007] Optionally, the support unit includes two symmetrically arranged brackets, each of the brackets includes an upper bracket and a lower bracket fixedly connected, the bottom of the upper bracket and the top of the lower bracket are provided with a concave arc-shaped mounting platform, the two arc-shaped mounting platforms of the same bracket form a mounting hole, the two ends of the molding unit are respectively arranged in the mounting holes of the two brackets, the bottom of the concave arc-shaped mounting platform of the lower bracket is provided with a plane for stopping the molding unit from rotating, and the contact part between the molding unit and the bracket mounting hole is provided with a plane matching it; the upper bracket and the lower bracket leave a gap of 1 mm in the working state for tightening by bolts, and a through hole is provided on the upper bracket, through which a temperature measuring thermocouple can be inserted into the mold body for temperature control.

[0008] Optionally, the molding unit includes a mold body, which includes a front upper mold, a front lower mold, a rear left outer mold, a rear right outer mold and a core. The front upper mold and the front lower mold, the rear left outer mold and the rear right outer mold are all fixedly connected by connecting bolts and positioned by locating pins; the core is fixedly connected by connecting bolts and positioned between the rear left outer mold and the rear right outer mold. One end of the core is tightly attached to the end of the front upper mold to jointly limit the deformation of the upper side of the strip. The front lower mold is tightly attached to the rear left outer mold and the rear right outer mold to jointly limit the deformation of the lower side of the strip. The other end of the core is passed through the stitching unit. ; The rear sides of the rear left outer mold and the rear right outer mold are provided with circular protrusions for positioning the suturing die; the bottom of the front upper mold is provided with a gradient upper molding surface, and the top of the front lower mold is provided with a lower molding surface matching the upper molding surface. The front upper mold and the front lower mold are used to jointly realize the bending transformation of the strip, and one side of the rear left outer mold is provided with a gradient left outer cavity surface, and one side of the rear right outer mold is provided with a right outer cavity surface opposite to the left outer cavity surface. The outer wall of the core is provided with a gradient inner cavity surface. The rear left outer mold, the rear right outer mold and the core can form the bent strip into a tube.

[0009] Optionally, the heating unit includes two sets of heating rings and a set of heating rods, which can perform gradient heating on the molding unit and provide heating for the suturing unit. The two sets of heating rings are respectively arranged on the periphery of the molding unit; the heating rods are arranged at the suturing unit; the molding unit and the suturing unit are both provided with temperature measuring holes on the top, and the temperature measuring holes are used to insert temperature measuring thermocouples connected to the temperature control device. The temperature of the main body is measured in real time by the temperature measuring thermocouples. At the same time, the temperature control device can adjust the working state of the heating device according to the difference between the set target temperature and the actual temperature. The heating device arranged on the main body can The temperature of the mold is controlled at 180-230°C to ensure that it is in the lower temperature range of the PEEK high elastic state, and the temperature on the mold body is distributed in a step-by-step increasing state from front to back. The advantage of this is that it can not only ensure the deformation ability of the high elastic strip, but also ensure the transmission ability of the high elastic strip itself from front to back in the molding unit, and effectively save energy while achieving the molding goal; the heating device arranged on the sewing unit can heat its local small area to the temperature required for pipe sewing. The sewing temperature can be selected in the range of 330-350°C to achieve pipe sewing.

[0010] Optionally, the sewing unit includes a sewing die, the front end of which is in the shape of a circular boss and can be clearance-fitted and positioned with the circular bosses of the rear left outer mold and the rear right outer mold, and the connection is achieved by bolts. The sewing die is provided with a heating rod hole, and the heating rod hole is arranged above the sewing area of ​​the pipe to locally heat the contact seam of the strip into a tube so that it is locally melted and bonded. Through the parametric design of the heat dissipation structure, the outer side of the sewing die is designed as a unique heat dissipation structure to achieve a high-temperature zone in a small local area circumferentially of the sewing area and a distribution of low-temperature zones in the remaining areas, thereby ensuring the stiffness of the pipe after forming. The heating rod connected to the temperature control device is inserted into the heating rod hole.

[0011] Optionally, it also includes an import unit, which is located at the front end of the molding unit. The import unit includes an import punch and an import die arranged up and down, and the import die and the import punch are positioned by a stop and connected by bolts; the import die is provided with a stepped hole for bolts to connect the import die with the lower bracket located at the front end of the molding unit; the import punch and the import die are provided with a strip speed measuring unit, which can monitor the speed of the strip when it is fed, and is used to match the suturing quality when the subsequent suturing unit sews the pipe.

[0012] Optionally, a shaping unit is provided at the end of the stitching unit. The shaping unit is used to fine-tune the outer dimensions of the pipe to ensure sufficient straightness. Multiple laser probes are designed at the outlet of the shaping unit to measure and monitor the straightness of the pipe after shaping.

[0013] Optionally, a traction unit is provided at the end of the shaping unit, and the traction unit includes two soft rollers that cooperate with each other in an upper and lower manner, and the two soft rollers are provided with an inwardly concave arc-shaped area groove, and the two arc-shaped area grooves are symmetrically arranged up and down; the soft roller located below is consistent with the pipe output position, and the soft roller located above can adjust the upper and lower positions through an L-shaped plate device, and the two soft rollers can maintain synchronous relative rotation, and a closed toothed belt is provided on one side of the traction unit, and one end of the toothed belt is respectively connected to a toothed belt pulley fixedly provided at one end of the upper and lower soft rollers, and the other end of the toothed belt is connected to a tensioning pulley, and a toothed belt pulley is provided at the other end of the lower soft roller, and the toothed belt pulley is connected to the toothed belt pulley below the feeding unit through the toothed belt.

[0014] Optionally, a feeding unit is provided at the front end of the introduction unit, and the feeding unit includes four feeding rollers symmetrically arranged in the upper and lower parts, and four tensioning rollers symmetrically arranged in the middle of the feeding rollers, and the two ends of the lower feeding roller and the tensioning roller are movably set on two symmetrical feeding bases, and the two ends of the upper feeding roller and the tensioning roller are movably set on L-shaped plates on both sides of the feeding base. The two feeding rollers located above are connected by a closed toothed belt transmission, and the two feeding rollers located below are connected by another closed toothed belt transmission, and the upper and lower feeding rollers are driven by a pair of meshing gears; limiting parts with circular protrusion structures are provided on both sides of the feeding roller located below, the feeding rollers located below are on the same horizontal line, and the feeding rollers located above can adjust the upper and lower positions through the L-shaped plate device.

[0015] The cam is provided with a support frame and a guide wheel assembly, and the guide wheel assembly is installed in the cam assembly to move the support frame and the guide wheel assembly into and out of the cam assembly.

[0016] The present invention also provides a method for making a tube by continuously and gradually bending and sewing a PEEK strip, comprising the following steps:

[0017] S1. Molding preparation stage: Install the entire device and debug it, complete the mold preheating; prepare PEEK strips of appropriate width and remove impurities on the strip surface;

[0018] S2. Forming stage: The strip is fed into the induction unit to complete the strip reception preparation and begin the strip tube forming process. The strip is bent and deformed from a straight strip at the front end, and then enters the back end and is gradually rolled into the desired tube shape.

[0019] S3. Stitching stage: After the tube forming stage is completed, that is, the two sides of the strip are butted together, the strip is fed into the stitching unit to stitch the tube.

[0020] Compared with the prior art, the present invention has achieved the following technical effects:

[0021] 1. The device of the present invention has a high degree of integration, effectively reducing the size of the entire device, and meeting the requirements of miniaturization and lightweight equipment required in space launch and on-orbit manufacturing.

[0022] 2. During the strip feeding process, the molding temperature is set in a gradient manner to ensure that the temperature of the mold body is in the range of 180-230°C. This can not only provide the necessary temperature and sufficient deformation capacity required for forming the pipe, but also reduce the increasing molding force of the strip during the gradual deformation process. At the same time, compared with the lower energy required for extrusion molding, it can effectively control heat loss, reduce production costs, and conform to the concept of space thermal management.

[0023] 3. The strip is in a highly elastic state during the forming process, and the temperature is set to gradually increase in a gradient, which can effectively reduce the feedback force caused by the deformation of the strip. After being stitched in a small local area of ​​the stitching unit, it still has a certain rigidity and does not require a cooling device. This avoids the need for special cooling due to the lack of rigidity of the pipe after the traditional forming process. In addition, the pipe output speed is faster than the traditional process, and the production efficiency is high.

[0024] 4. Taking the pipe forming accuracy and quality as indicators, the forming mold structure is optimized and designed, and the quadratic curve is selected as the final forming bottom line, which effectively reduces the unnecessary deformation resistance caused at the mold structure level, and the forming process is carried out in a closed mold cavity, which can effectively control the accuracy of the continuous gradual bending-stitching pipe making of the strip.

[0025] 5. A creative process for forming PEEK strips by direct continuous gradient bending and stitching to form tubes is proposed, which avoids the common feature of traditional plastic tube making that requires heating the raw materials to a molten state, saving energy. Moreover, due to the high-elastic state and low-temperature molding, and localized small-area melting and stitching, the tube still has a certain rigidity after molding, reducing the need for additional cooling steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 Schematic diagram of the overall structure of the PEEK strip continuous gradual bending-stitching tube making device of the present invention;

[0028] Figure 2 This is a schematic structural diagram of the unwinding unit of the present invention;

[0029] Figure 3 This is a schematic structural diagram of the feeding unit of the present invention;

[0030] Figure 4 This is a schematic structural diagram of the introduction unit and the support unit of the present invention;

[0031] Figure 5 Schematic diagram of the molding unit structure of the present invention;

[0032] Figure 6 Schematic diagram of the structure of the suturing unit of the present invention;

[0033] Figure 7 This is a schematic diagram of the front upper mold structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the front lower mold structure of the present invention;

[0035] Figure 9 This is a schematic diagram of the rear left outer mold structure of the present invention;

[0036] Figure 10 Schematic diagram of the core structure of the present invention;

[0037] Figure 11 This is a schematic diagram of the mold cavity structure of the present invention;

[0038] Figure 12 This is a structural diagram of the traction unit of the present invention;

[0039] Figure 13 Schematic diagram of the changes in the strip tube making process in Example 1 of the present invention;

[0040] Figure 14 Schematic diagram of the changes in the strip tube making process in the second embodiment of the present invention;

[0041] Figure 15 Schematic diagram of the changes in the strip tube making process in the third embodiment of the present invention;

[0042] Description of reference numerals: 1-installation platform, 2-unwinding unit, 201-unwinding base, 202-support frame, 203-unwinding wheel, 204-guide column, 205-pressing plate, 206-spring, 207-pressing block, 208-pressing sheet, 3-feeding unit, 301-feeding roller, 302-tensioning roller, 303-feeding base, 4-introduction unit, 401-introduction punch, 402-introduction die, 5-support unit, 501-upper bracket, 502-lower bracket, 6-molding unit, 601-front upper mold, 6011-upper molding surface, 602-front lower mold, 6021-lower molding surface, 603-rear left outer mold, 6031-left outer cavity surface, 604-core, 6041-inner cavity surface, 7-stitching unit, 701-stitching mouth mold, 8-shaping unit, 9-traction unit, 901-soft roller. DETAILED DESCRIPTION

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0044] The purpose of the present invention is to provide a PEEK strip continuous gradual bending-stitching tube making device and method to solve the problems existing in the above-mentioned prior art, which can realize the continuous gradual forming of PEEK tubes and effectively control the energy consumption and heat input in the forming process.

[0045] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Reference Attachment Figure 1 ~Attached Figure 12 As shown, the present invention provides a PEEK strip continuous gradual bending-stitching tube making device, comprising an unwinding unit 2, a feeding unit 3, an introduction unit 4 and a support unit 5 sequentially arranged on a mounting platform 1, a forming unit 6 and a stitching unit 7 being provided on the support unit 5, the forming unit 6 being used to convert the strip into a tube; the stitching unit 7 being used to melt and bond the contact seam of the tube; the forming unit 6 and the stitching unit 7 being provided with a heating unit, the heating unit being used to heat the forming unit 6 and the stitching unit 7 to a set temperature.

[0047] Specifically, the unwinding unit 2 includes an unwinding base 201, a long strip of sliding groove is opened on the top of the unwinding base 201, a support frame 202 and an unwinding wheel 203 are slidably provided on the slide groove, and a guide column 204 is provided between the support frame 202 and the unwinding wheel 203; there are three guide columns 204 in total, one end of the two guide columns 204 on the left and right is fixed to the support frame 202 by bolts, and the two guide columns 204 on the left and right are away from the support frame 202 and are slidably provided with a pressing plate 205, and one end of the guide column in the middle is fixed to the pressing plate 205, and the other end is movable It is passed through the support frame 202, and a spring 206 is sleeved on the guide column in the middle. The two ends of the spring 206 are respectively in contact with the support frame 202 and the clamping plate 205, and a pressing block 207 is provided at the front end of the clamping plate 205; protrusions are designed on both sides of the unwinding wheel 203, and a gap greater than the width of the unwinding wheel protrusion is provided on both sides of the pressing block 207 and the clamping plate 205. The length of the pressing block 207 is smaller than the concave part in the middle of the unwinding wheel, and the thickness of the pressing block 207 is greater than the height of the unwinding wheel protrusion; a pressing plate 208 is arranged on the unwinding wheel, which can clamp the innermost end of the roll on the unwinding wheel.The feeding unit 3 includes four feeding rollers 301 arranged symmetrically in the upper and lower parts, and four tensioning rollers 302 are symmetrically arranged in the middle of the feeding rollers 301. The two ends of the lower feeding roller 301 and the tensioning roller 302 are movably arranged on two symmetrical feeding bases 303. The two ends of the upper feeding roller 301 and the tensioning roller 302 are movably arranged on the L-shaped plates on both sides of the feeding base 303. The two feeding rollers 301 at the top are connected by a closed toothed belt transmission, and the two feeding rollers 301 at the bottom are connected by another closed toothed belt transmission. A closed toothed belt drive connection is used, and the upper and lower feed rollers are driven by a pair of meshing gears; the feed roller 301 at the bottom is provided with a circular convex structure limit part on both sides, and the feed roller 301 at the bottom is on the same horizontal line, and the feed roller 301 and the tensioning roller 302 at the top can adjust the upper and lower positions through the L-shaped plate device. The tensioning roller 302 ensures that the toothed belts set up above and below can fully play the role of pressing the PEEK strip. The feed roller 301 and the tensioning roller at the top 302 is installed on the L-shaped plate, which is adjustable up and down and can be tightened to prevent loosening by bolt gaskets. The horizontal position of the L-shaped plate is kept synchronized by the positioning pins arranged at the bottom and the guide blocks arranged on the left and right, and the high and low positions are adjusted by the studs arranged at the bottom; the feeding device is equipped with a transmission toothed pulley connected to the traction device, and the transmission connection between the two is transmitted by the toothed belt arranged between the feeding device and the traction device, and the speed matching is controlled by the tooth ratio of the toothed pulley arranged thereon; the import unit 4 is located at the front end of the forming unit 6, and the import unit 4 includes an import punch 401 and an import die 402 arranged up and down, and the import die 402 and the import punch 401 are positioned by a stop and connected by bolts; a stepped hole is opened on the import die for bolts to connect the import die to the lower bracket at the front end of the forming unit; the import punch 401 and the import die 402 are provided with a strip speed measuring unit, which can monitor the speed of the strip when feeding, and is used to match the suture quality when the subsequent suture unit sutures the pipe.

[0048] The support unit 5 includes two symmetrically arranged brackets, each of which includes an upper bracket 501 and a lower bracket 502 that are fixedly connected. The bottom of the upper bracket 501 and the top of the lower bracket 502 are both provided with concave arc-shaped mounting platforms. The two arc-shaped mounting platforms of the same bracket form a mounting hole. The two ends of the molding unit are respectively arranged in the mounting holes of the two brackets. The bottom of the concave arc-shaped mounting platform of the lower bracket 502 is provided with a plane for stopping the molding unit from rotating. The contact part between the molding unit and the bracket mounting hole is provided with a plane that matches it. In the working state, a gap of 1 mm is left between the upper bracket 501 and the lower bracket 502 for tightening by bolts. A through hole is provided on the upper bracket 501, through which a temperature measuring thermocouple can be inserted into the mold body for temperature control. The molding unit 6 includes a mold body, which includes a front upper mold 601, a front lower mold 602, a rear left outer mold 603, a rear right outer mold and a core 604. The front upper mold 601 and the front lower mold 602, the rear left outer mold 603 and the rear right outer mold are fixedly connected by connecting bolts and positioned by locating pins; the core 604 is fixedly connected and positioned between the rear left outer mold and the rear right outer mold by connecting bolts, one end of the core 604 is tightly attached to the end of the front upper mold 601, jointly limiting the deformation of the upper side of the strip, the front lower mold is tightly attached to the rear left outer mold and the rear right outer mold, and jointly limiting the deformation of the lower side of the strip, and the other end of the core 604 is passed through the stitching unit; the rear left outer mold and the rear right outer mold are provided with circular protrusions on the rear sides for positioning the stitching die; the bottom of the front upper mold 601 is provided with a gradient upper molding surface 6011, and the top of the front lower mold 602 is provided with a lower molding surface 6021 matching the upper molding surface 6011 The front upper die and the front lower die jointly realize the transformation of the strip from "one" to "U" shape. At this time, the deformation degree is relatively gentle. The temperature is heated to between 180 and 210°C by the heating unit. A gradient left outer cavity surface 6031 is provided on one side of the rear left outer die 603, and a right outer cavity surface opposite to the left outer cavity surface is provided on one side of the rear right outer die. The outer wall of the core 604 is provided with a gradient inner cavity surface 6041. The rear left outer die, the rear right outer die and the core can form the bent strip into a tube. The rear left outer die, the rear right outer die and the core realize the transformation of the strip from "U" shape to "O" shape. The deformation degree of the strip is relatively severe. The strip feeding generates a large force. The temperature is heated to between 210 and 230°C by the heating unit. The temperature is slightly increased to reduce the feeding force to prevent pipe defects caused by the large feeding force. The temperature range of 210 to 230°C is in the lower temperature range of the high elastic state of PEEK.

[0049] The heating unit includes two sets of heating coils and a set of heating rods, which can provide gradient heating for the molding unit and heat the stitching unit. The two sets of heating coils are respectively arranged on the periphery of the molding unit; the heating rods are arranged on the stitching unit. The tops of both the molding unit and the stitching unit are provided with temperature measuring holes. The temperature measuring holes are used to insert thermocouples connected to the temperature control device. The temperature of the main body is measured in real time by the temperature measuring thermocouples. At the same time, the temperature control device can adjust the working state of the heating device according to the difference between the set target temperature and the actual temperature. The heating device installed on the main body can control the temperature of the mold to 180-230°C, ensuring that it is in the lower temperature range of the highly elastic state of PEEK. The temperature distribution on the mold body is in a state of gradual increase from front to back. The advantage of this is that it can not only ensure the deformation ability of the highly elastic strip, but also ensure the ability of the highly elastic strip to be transported from front to back in the molding unit, and effectively save energy while achieving the molding goal. The heating device arranged on the stitching unit can heat a small local area to the temperature required for pipe stitching. The stitching temperature can be selected in the range of 330-350°C to achieve pipe stitching.

[0050] The sewing unit 7 includes a sewing die 701. The front end of the sewing die 701 is in the shape of a circular boss and can be clearance-matched and positioned with the circular bosses of the rear left outer mold and the rear right outer mold. The connection is achieved by bolts. A heating rod hole is provided on the sewing die. The heating rod hole is set above the sewing area of ​​the pipe to locally heat the contact seam of the strip into a tube so that it is locally melted and bonded. Through the parametric design of the heat dissipation structure, the outer side of the sewing die is designed as a unique heat dissipation structure to achieve a high-temperature zone in a small local area circumferentially of the sewing area and the distribution of the remaining low-temperature zones to ensure the rigidity of the pipe after forming. The heating rod is inserted into the heating rod hole.

[0051] The end of the stitching unit 7 is provided with a shaping unit 8, which is used to refine the outer dimensions of the pipe to ensure sufficient straightness of the pipe. At the outlet of the shaping unit 8, multiple sets of laser probes are designed to measure and monitor the straightness of the pipe after shaping.

[0052] Further preferably, a traction unit 9 is provided at the end of the shaping unit 8, and the traction unit 9 includes two soft rollers 901 that cooperate with each other in an upper and lower manner. Both soft rollers 901 are provided with an inwardly concave arc-shaped area groove, and the two arc-shaped area grooves are symmetrically arranged in an upper and lower manner; the soft roller 901 located at the bottom is consistent with the pipe output position, and the soft roller located at the top can adjust the upper and lower positions through an L-shaped plate device, and the two soft rollers can maintain synchronous relative rotation. A closed toothed belt is provided on one side of the traction unit, and one end of the toothed belt is respectively connected to a toothed belt pulley fixedly provided at one end of the upper and lower soft rollers, and the other end of the toothed belt is connected to a tensioning pulley. A toothed belt pulley is provided at the other end of the lower soft roller, and the toothed belt pulley is connected to the toothed belt pulley below the feeding unit through a toothed belt.

[0053] Example 1

[0054] Reference Attachment Figure 13 As shown, this embodiment provides a method for making a tube by continuous gradual bending and stitching of a PEEK strip based on the above-mentioned device, comprising the following steps:

[0055] S1. Forming preparation stage: The entire strip continuous gradient bending and stitching tube-making device is installed and debugged, including preheating the forming device. Two heating coils are activated to heat the mold body to a gradient distribution of 180-230°C. The heating rod in the stitching die is activated to bring the stitching die to a constant temperature of 330-350°C locally for stitching the tube, completing mold preheating. PEEK strip of appropriate width is prepared and impurities on the strip surface are removed.

[0056] S2. Forming Stage: The strip is fed into the front feeder to complete its reception and begin the tube-forming process. Specifically, the strip is deformed from a straight strip into a "U" shape at the front end before gradually rolling into a round shape at the rear end. The feed speed is controlled based on factors such as the strip thickness, the temperature difference before and after the forming device, and the temperature of the stitching unit. During the forming stage, the rational design of the forming unit ensures that the strip is rolled into a tube in one direction.

[0057] The feed speed can be reasonably selected and matched according to the thermal conductivity of the PEEK strip and the mold body.

[0058] S3. Stitching stage: After the tube is formed, the two sides of the strip are butted together. At this time, the strip is fed into the stitching area to stitch the tube. Figure 5 As shown, the sewing unit 7 is provided with a heating rod hole above the tube forming part for heating by the heating unit. The heating rod here provides heat for sewing the strip, bonding the two sides of the strip together. Specifically, the sewing temperature here should match the feeding speed of the strip.

[0059] Example 2

[0060] Reference Attachment Figure 14 As shown, this embodiment is further modified on the basis of the above, and provides a production method for square tube fittings of the same (or different) materials, that is, the continuous gradual bending-stitching tube making device for square tube fittings continuously and gradually transforms the straight strip into a square tube fitting according to the design method of the present invention, that is, the front end of the strip forming device is divided into upper and lower mold limits according to the design method of the present invention, and the rear end is divided into left and right outer molds and a core, and the concave shape is gradually rolled into a square, and the subsequent stitching link stitches the square parts into shape to produce square tubes.

[0061] The molding method mainly includes the following steps:

[0062] S1. Forming preparation stage: The entire strip continuous gradient bending and stitching tube-making device is installed and commissioned, including preheating the forming device, activating the heating device on the forming device to gradient heat the mold body, activating the local heating device in the stitching area to stitch the tube, and completing mold preheating; preparing strip of appropriate width and removing impurities from the strip surface;

[0063] S2. Forming Stage: The strip is fed into the front feeder to complete its reception, where it is then rolled into a tube at a predetermined speed. Specifically, the strip is deformed from a straight line into a concave shape at the front end before gradually rolling into a square shape at the rear end. The feed speed is controlled based on factors such as the strip thickness, the temperature difference before and after the forming device, and the temperature of the stitching unit. During the forming stage, the rational design of the forming unit ensures that the strip is rolled into a tube in one direction.

[0064] The feed speed can be reasonably selected and matched according to the material of the strip and the thermal conductivity of the mold body.

[0065] S3. Stitching: After the tube forming stage, when the strip edges are butted, the strip is fed into the stitching zone to stitch the tubes together. Specifically, the stitching temperature here should match the strip feed speed.

[0066] Example 3

[0067] Reference Attachment Figure 15 As shown, this embodiment provides a method for producing triangular tube fittings made of the same (or different) materials, that is, the strip continuous gradual bending-stitching tube-making device for triangular tube fittings continuously and gradually transforms the straight strip into triangular tube fittings according to the design method of the present invention, that is, the front end of the strip forming device is divided into upper and lower mold limits according to the design method of the present invention, and the rear end is divided into left and right outer molds and a core, and the V shape is gradually rolled into a triangle. The subsequent stitching link sews the triangular piece into shape to produce triangular tubes.

[0068] The molding method mainly includes the following steps:

[0069] S1. Forming preparation stage: The entire strip continuous gradient bending and stitching tube-making device is installed and commissioned, including preheating the forming device, activating the heating device on the forming device to gradient heat the mold body, activating the local heating device in the stitching area to stitch the tube, and completing mold preheating; preparing strip of appropriate width and removing impurities from the strip surface;

[0070] S2. Forming Stage: The strip is fed into the front feeder to complete its reception, and then the strip is formed into a tube at a predetermined speed. Specifically, the strip is deformed from a straight strip into a V-shape at the front end, and then gradually rolled into a triangle at the rear end. The feed speed is appropriately controlled based on the strip thickness, the temperature difference before and after the forming device, and the temperature of the stitching unit. During the forming stage, the rational design of the forming unit enables the strip to be rolled into a tube in one direction.

[0071] The feed speed can be reasonably selected and matched according to the material of the strip and the thermal conductivity of the mold body.

[0072] S3. Stitching: After the tube forming stage, when the strip edges are butted, the strip is fed into the stitching zone to stitch the tubes together. Specifically, the stitching temperature here should match the strip feed speed.

[0073] In the description of the present invention, it should be noted that the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A PEEK strip continuous gradient bending-stitching tube making device, characterized by: The invention comprises a forming unit for converting a strip into a tube; a sewing unit for melting and bonding the contact seams of the tube; A heating unit, the heating unit is used to heat the molding unit and the sewing unit to a set temperature; a support unit, the support unit is used to install and support the molding unit, the heating unit and the sewing unit; the support unit includes two symmetrically arranged brackets, each of the brackets includes an upper bracket and a lower bracket fixedly connected, the bottom of the upper bracket and the top of the lower bracket are both provided with a concave arc-shaped mounting platform, the two arc-shaped mounting platforms of the same bracket form a mounting hole, and the two ends of the molding unit are respectively arranged in the mounting holes of the two brackets ; The molding unit includes a mold body, and the mold body includes a front upper mold, a front lower mold, a rear left outer mold, a rear right outer mold and a core. The front upper mold and the front lower mold, the rear left outer mold and the rear right outer mold are fixedly connected by connecting bolts, and are positioned by locating pins; the core is fixedly connected by connecting bolts and positioned between the rear left outer mold and the rear right outer mold. One end of the core is tightly attached to the end of the front upper mold to jointly limit the deformation of the upper side of the strip, and the front lower mold is tightly attached to the rear left outer mold and the rear right outer mold to jointly limit the deformation of the lower side of the strip. The other end of the core is passed through the stitching unit; The rear sides of the rear left outer mold and the rear right outer mold are provided with circular protrusions for positioning the suturing die; the bottom of the front upper mold is provided with a gradient upper forming surface, the top of the front lower mold is provided with a lower forming surface matching the upper forming surface, the front upper mold and the front lower mold are used to jointly realize the bending transformation of the strip, one side of the rear left outer mold is provided with a gradient left outer cavity surface, one side of the rear right outer mold is provided with a right outer cavity surface opposite to the left outer cavity surface, the outer wall of the core is provided with a gradient inner cavity surface, the rear left outer mold, the rear right outer mold and the core can form the bent strip into a tube; The strip is fed into the introduction unit to complete the preparation for receiving the strip and start the strip tube forming process; the strip is bent and deformed from a straight strip at the front end, and then enters the rear end and is gradually rolled into the required tube shape; the heating unit includes two groups of heating rings and a group of heating rods, and the two groups of heating rings are respectively arranged on the outer periphery of the forming unit; it also includes an introduction unit, which is located at the front end of the forming unit, and the introduction unit includes an introduction punch and an introduction die arranged up and down, and the introduction die and the introduction punch are positioned by a stop and connected by bolts.

2. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 1, characterized in that: The heating rod is arranged at the sewing unit; the tops of the molding unit and the sewing unit are both provided with temperature measuring holes, and the temperature measuring holes are used to insert temperature measuring thermocouples connected to the temperature control device.

3. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 2, characterized in that: The sewing unit includes a sewing die, the front end of which is in the shape of a circular boss and can be clearance-fitted and positioned with the circular bosses of the rear left outer die and the rear right outer die, and is connected by bolts. A heating rod hole is provided on the sewing die, and the heating rod hole is arranged at a position above the pipe sewing area, and the heating rod connected to the temperature control device is inserted into the heating rod hole.

4. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 1, characterized in that: The introduction die is provided with a stepped hole for bolts to connect the introduction die to the lower bracket at the front end of the forming unit; the introduction punch and the introduction die are provided with a strip speed measuring unit, which can monitor the speed of the strip when it is fed, so as to match the sewing quality when the subsequent sewing unit sews the pipe.

5. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 1, characterized in that: A shaping unit is provided at the end of the suturing unit, and a plurality of laser probes are provided at the outlet of the shaping unit.

6. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 5, characterized in that: A traction unit is provided at the end of the shaping unit, and the traction unit includes two soft rollers that cooperate with each other in an upper and lower manner. Both soft rollers are provided with an inwardly concave arc-shaped area groove, and the two arc-shaped area grooves are symmetrically arranged up and down; the soft roller located below is consistent with the pipe output position, and the soft roller located above can adjust the upper and lower positions through an L-shaped plate device, and the two soft rollers can maintain synchronous relative rotation. A closed toothed belt is provided on one side of the traction unit, and one end of the toothed belt is respectively connected to a toothed belt pulley fixed at one end of the upper and lower soft rollers, and the other end of the toothed belt is connected to two tensioning pulleys. A toothed belt pulley is provided at the other end of the soft roller located below, and the toothed belt pulley is connected to the toothed belt pulley below the feeding unit through a toothed belt.

7. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 4, characterized in that: A feeding unit is provided at the front end of the introduction unit, and the feeding unit includes four feeding rollers symmetrically arranged in an upper and lower manner. The two ends of the lower feeding roller and the tensioning roller are movably set on two symmetrical feeding bases, and the two ends of the upper feeding roller and the tensioning roller are movably set on L-shaped plates on both sides of the feeding base. The two upper feeding rollers are connected by a closed toothed belt transmission, and the two lower feeding rollers are connected by another closed toothed belt transmission. The upper and lower feeding rollers are driven by a pair of meshing gears; limiting parts with circular protrusion structures are provided on both sides of the lower feeding roller, the lower feeding rollers are on the same horizontal line, and the upper feeding roller can adjust the upper and lower positions through the L-shaped plate device.

8. The PEEK strip continuous gradient bending-stitching tube-making device according to claim 7, characterized in that: Material toggling mechanism, its both ends are to be connected with the support frame, and the support frame is to be connected with the support frame, and the support frame is to be connected with the support frame of the support frame, and the support frame is to be connected with the support frame A pressing piece is arranged on the unwinding wheel, which can clamp the innermost end of the coil on the unwinding wheel.

9. A method for making a PEEK strip tube by continuous gradual bending and sewing based on the PEEK strip tube-making device according to any one of claims 1 to 8, characterized in that: The steps include: S1. Molding preparation stage: Install the entire device and debug it, complete the mold preheating; prepare PEEK strips of appropriate width and remove impurities on the strip surface; S2. Forming stage: The strip is fed into the induction unit to complete the strip reception preparation and begin the strip tube forming process. The strip is bent and deformed from a straight strip at the front end, and then enters the back end and is gradually rolled into the desired tube shape. S3. Stitching stage: After the tube forming stage, the two sides of the strip are butted together. At this time, the strip is fed into the stitching unit to stitch the tube together.

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