A continuous forming device for an integrated heat-insulating elbow outer protective pipe

Abstract

This invention relates to the field of thermal insulation pipe manufacturing technology, specifically to an integrated continuous forming device for the outer protective pipe of an insulated elbow. It includes a screw extruder, an elbow forming mold, and a cooling and shaping section, as well as an elbow support mechanism. The elbow support mechanism includes an arc-shaped support slide extending along the bending center line of the elbow forming mold, and an end traction clamp including a rotary support base and a ring-shaped flexible gripper. The ring-shaped flexible gripper is mounted on the rotary support base. An arc-shaped transmission guide rail is provided below the arc-shaped support slide, and the rotary support base is slidably mounted on the arc-shaped transmission guide rail. This invention effectively suppresses the sagging, swaying, and trajectory deviation of large-diameter insulated elbow outer protective pipes caused by their own weight through the arc-shaped support slide supporting the outer protective pipe, combined with the uniform traction of the outer protective pipe by the end traction clamp, and the coordinated assistance of the lifting devices at both ends of the arc-shaped support slide.

Description

Technical Field

[0001] This invention relates to the field of thermal insulation pipe production technology, specifically to a continuous forming device for an integrated thermal insulation elbow outer protective pipe. Background Technology

[0002] In centralized heating pipeline systems, elbows, as critical connecting components, are buried underground for extended periods, and the integrity of their insulation structure directly affects the system's thermal efficiency and service life. Traditional insulated elbows often use prefabricated sections and on-site splicing methods for their outer protective pipes, resulting in noticeable seams or interfaces. These seams are susceptible to damage to the insulation layer due to soil stress, moisture penetration, or construction damage, making them prone to corrosion.

[0003] To improve reliability, traditionally seamless, one-piece outer protective tube structures are used. However, when continuously forming large-diameter flexible elbows, existing production equipment mostly relies on hoisting and moving. As the length of the continuously extruded outer protective tube of the insulated elbow increases, it becomes more unstable, and there is a common problem of insufficient support, which can easily lead to safety hazards and make it difficult to stably produce high-quality integral insulated elbow outer protective tubes.

[0004] Therefore, there is a need for an integrated continuous forming device for the outer protective pipe of insulated elbows to solve the problems of insufficient support and unstable operation caused by the hoisting method in the existing technology, and to ensure the forming accuracy of the whole seamless outer protective pipe. Summary of the Invention

[0005] To address the problems existing in the prior art, an integrated continuous forming device for the outer protective pipe of an insulated elbow is provided. The outer protective pipe of the insulated elbow is supported by an arc-shaped support slide, and the outer protective pipe of the insulated elbow is pulled at a constant speed by an end traction clamp. With the assistance of the lifting devices at both ends of the arc-shaped support slide, the device effectively suppresses the sagging, swaying and trajectory deviation of the outer protective pipe of the large-diameter insulated elbow caused by its own weight.

[0006] To address the problems of existing technologies, this invention provides an integrated continuous forming device for the outer protective tube of an insulated elbow, comprising a screw extruder, an elbow forming die, and a cooling and shaping section. The discharge port of the screw extruder is connected to the elbow forming die, and the cooling and shaping section is located at the outlet end of the elbow forming die. The device also includes an elbow support mechanism, which comprises an arc-shaped support slide extending along the bending center line of the elbow forming die. The arc-shaped support slide is located below the outer protective tube of the insulated elbow. The inner surface of the slide is a smooth curved surface that matches the outer contour of the outer protective pipe of the insulated elbow. The end traction clamp is set on the trajectory line of the arc-shaped support slide and includes a rotary support seat and a ring-shaped flexible gripper. The rotary support seat is arranged coaxially with the elbow forming mold. The ring-shaped flexible gripper is installed on the rotary support seat. An arc-shaped transmission guide rail is provided below the arc-shaped support slide. The rotary support seat is slidably set on the arc-shaped transmission guide rail. The arc-shaped transmission guide rail is arranged along the curvature path of the arc-shaped support slide.

[0007] Preferably, the arc-shaped support slide is composed of two arc-shaped base supports, with a gap channel extending along the curved path between the two arc-shaped base supports, and the end traction clamp passing through the gap channel.

[0008] Preferably, the end of the arc-shaped support slide facing the bend forming mold has a chamfered surface, and the chamfered surface extends obliquely inward along the edge of the arc-shaped base.

[0009] Preferably, a plurality of cooling nozzles are provided at equal intervals on both sides of the arc-shaped support slide along the curved path, and the spraying direction of the cooling nozzles is toward the smooth curved surface inside the arc-shaped support slide.

[0010] Preferably, the curved transmission guide rail has a central shaft at its bending center, and a traction rod is connected between the central shaft and the rotary support seat. One end of the traction rod is rotatably connected to the central shaft, and the other end is fixedly connected to the rotary support seat.

[0011] Preferably, the circumferential flexible gripper includes a fixed rod, an inner support member, and an outer clamping member. The fixed rod is fixedly connected to the rotary support base. The inner support member and the outer clamping member are both mounted on the fixed rod. An annular clamping space is formed between the inner support member and the outer clamping member to accommodate the end of the outer protective pipe of the insulated elbow.

[0012] Preferably, the inner support includes a collar and a rubber ring. The collar is fixedly connected to the fixing rod, and the rubber ring is sleeved on the outer periphery of the collar for abutting against the inner wall of the outer protective pipe of the insulation elbow in the clamped state.

[0013] Preferably, the outer clamp includes multiple arc-shaped clamping arms, which are evenly distributed along the circumference of the fixed rod. A linear slide rail extending radially along the fixed rod is provided on the fixed rod corresponding to the position of each arc-shaped clamping arm, and the arc-shaped clamping arm is slidably disposed on the linear slide rail.

[0014] Preferably, each arc-shaped clamping arm has a flexible pad on its inner side, each arc-shaped clamping arm has a return spring on its outer side, and each linear slide rail has an end plate at its outer end. One end of the return spring is fixedly connected to the arc-shaped clamping arm, and the other end is fixedly connected to the end plate.

[0015] Preferably, the outer clamp further includes a driving pressure plate, which is slidably disposed on the fixed rod. The driving pressure plate is provided with a pressure block at the position corresponding to each arc-shaped clamping arm, and the pressure block and the corresponding arc-shaped clamping arm are provided with mutually cooperating inclined surfaces.

[0016] The advantages of this application compared to the prior art are:

[0017] 1. This invention provides surface contact support to the bottom of the outer protective tube of the insulated elbow through an arc-shaped support slide, effectively preventing the large-diameter outer protective tube from sagging or swaying due to its own weight. Combined with the end traction clamp holding the front end of the outer protective tube, and moving at a uniform speed along the arc-shaped transmission guide according to the extrusion speed of the outer protective tube, the outer protective tube is guided to smoothly transition into the support area of ​​the arc-shaped support slide. At the same time, the hangers at both ends of the arc-shaped support slide provide auxiliary support for the insulated elbow in designated sections. Compared with the method of relying solely on hangers for traction and support, this effectively limits the swaying of the outer protective tube during the traction process, ensuring that the outer protective tube always moves smoothly along the preset bending trajectory, thereby achieving high-precision continuous forming of the outer protective tube.

[0018] 2. This invention utilizes cooling nozzles installed on both sides of the arc-shaped support slide to form a dynamic lubrication and cooling layer on the contact surface between the outer protective tube of the insulated elbow and the arc-shaped support slide, reducing frictional resistance and ensuring smooth traction of the large-diameter outer protective tube of the insulated elbow. During the traction process, the traction rod driven by the servo motor drives the rotary support seat to move precisely along the arc-shaped transmission guide rail, ensuring that the circumferential flexible gripper always holds the end of the outer protective tube of the insulated elbow in the correct posture, and achieving high-precision synchronization between traction speed and extrusion rate, effectively ensuring that the outer protective tube of the insulated elbow is subjected to uniform force and has consistent curvature during continuous forming.

[0019] 3. This invention uses pneumatic control to drive the pressure plate to push multiple arc-shaped clamping arms to retract radially and synchronously. In conjunction with the rubber ring in the inner support and the flexible pad on the outer clamping component, it achieves coordinated internal and external, circumferential, uniform clamping of the end of the outer protective tube of the insulated elbow. This provides reliable gripping force to transmit traction load, while avoiding scratches on the surface of the outer protective tube of the insulated elbow through flexible contact. The entire circumferential flexible clamping claw moves along the bending trajectory with the rotating support seat, ensuring a stable connection throughout the continuous forming of the outer protective tube of the large-diameter insulated elbow, laying the foundation for high-quality traction. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of an integrated thermal insulation elbow outer protective pipe continuous forming device according to the present invention.

[0021] Figure 2 This is a top view of an integrated thermal insulation elbow outer protective pipe continuous forming device according to the present invention.

[0022] Figure 3 This is a three-dimensional structural diagram of the end traction clamp of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention in the state of being connected to the thermal insulation elbow outer protective pipe.

[0023] Figure 4 This is a three-dimensional structural diagram of the end traction clamp of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention, which completes the traction of the thermal insulation elbow.

[0024] Figure 5 This is a three-dimensional structural diagram of the lifting device of the continuous forming device for the outer protective pipe of the integrated thermal insulation elbow of the present invention, showing how the lifting device lifts the outer protective pipe of the thermal insulation elbow.

[0025] Figure 6 This is a three-dimensional structural diagram of the elbow support mechanism of an integrated thermal insulation elbow outer protective pipe continuous forming device according to the present invention.

[0026] Figure 7 This is a top view of the elbow support mechanism of an integrated thermal insulation elbow outer protective pipe continuous forming device according to the present invention.

[0027] Figure 8 This is a partial three-dimensional structural diagram of the end traction clamp, arc-shaped support slide, and thermal insulation elbow outer protective pipe of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention from a first perspective.

[0028] Figure 9 This is a partial three-dimensional structural diagram of the end traction clamp, arc-shaped support slide, and thermal insulation elbow outer protective pipe of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention from a second perspective.

[0029] Figure 10This is a three-dimensional structural diagram of the end traction clamp of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention from a first perspective.

[0030] Figure 11 This is a three-dimensional structural diagram of the end traction clamp of the integrated thermal insulation elbow outer protective pipe continuous forming device of the present invention from a second perspective.

[0031] Figure 12 This is a partial three-dimensional structural cross-sectional view of the end traction clamp of an integrated thermal insulation elbow outer protective pipe continuous forming device according to the present invention.

[0032] The diagram is labeled as follows: 1. Insulated elbow outer protective pipe; 2. Screw extruder; 21. Platform; 22. Support; 3. Elbow forming die; 4. Cooling and shaping section; 5. Arc-shaped support slide; 51. Arc-shaped transmission guide rail; 511. Central shaft; 512. Traction rod; 52. Arc-shaped base; 521. Chamfered surface; 522. Cooling nozzle; 6. End traction clamp; 61. Rotary support seat; 62. Circumferential flexible gripper; 62 1. Fixed rod; 6211. Gas passage; 622. Inner support; 6221. Collar; 6222. Rubber ring; 623. Outer clamp; 6231. Arc-shaped clamping arm; 6232. Linear slide rail; 6233. Flexible pad; 6234. Return spring; 624. End plate; 625. Drive pressure plate; 6251. Pressure block; 6252. Sleeve; 6253. Piston sleeve; 6254. Tension spring; 7. Lifting device. Detailed Implementation

[0033] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0034] See Figures 1 to 5As shown, an integrated continuous forming device for the outer protective tube of an insulated elbow includes a screw extruder 2, an elbow forming die 3, and a cooling and shaping section 4. The discharge port of the screw extruder 2 is connected to the elbow forming die 3, and the cooling and shaping section 4 is located at the outlet end of the elbow forming die 3. It also includes an elbow support mechanism, which includes an arc-shaped support slide 5 extending along the bending center line of the elbow forming die 3. The arc-shaped support slide 5 is located below the outer protective tube 1 of the insulated elbow, and the inner surface of the arc-shaped support slide 5 is a smooth curved surface matching the outer contour of the outer protective tube 1 of the insulated elbow. An end traction clamp 6 is set on the trajectory line of the arc-shaped support slide 5, including a rotary support base 61 and a ring-shaped flexible gripper 62. The rotary support base 61 is arranged coaxially with the elbow forming die 3, and the ring-shaped flexible gripper 62 is mounted on the rotary support base 61. Below the arc-shaped support slide 5 is an arc-shaped transmission guide rail 51, and the rotary support seat 61 is slidably mounted on the arc-shaped transmission guide rail 51. The arc-shaped transmission guide rail 51 is arranged along the curvature path of the arc-shaped support slide 5.

[0035] The arc-shaped support slide 5 is equipped with a lifting device 7 at each end.

[0036] The cooling and shaping section 4 uses water spray cooling to quickly lower the temperature.

[0037] Working process: First, rubber or thermoplastic elastomer material is fed into the screw extruder 2. After being melted and plasticized by the screw extruder 2, it is continuously extruded from its outlet and directly enters the elbow forming die 3 that is connected to it. The elbow forming die 3 forcibly bends and shapes the high-temperature soft outer protective tube according to the preset bending radius and angle, so that it initially forms the required spatial elbow shape. Subsequently, the initially formed heat-insulating elbow outer protective tube 1 enters the cooling and shaping section 4 from the outlet end of the elbow forming die 3. In this area, it is rapidly cooled by spray water cooling to stabilize its geometry and improve structural strength.

[0038] After the front end of the outer protective tube 1 of the insulated elbow leaves the cooling and shaping section 4, it enters the working area of ​​the elbow support mechanism. At this time, the end traction clamp 6, located on the trajectory line of the arc-shaped support slide 5, actively intervenes. Its circumferential flexible gripper 62 clamps the end of the outer protective tube 1 of the insulated elbow from the outer periphery and the inner side with low constant tension, ensuring reliable clamping without damaging the surface. Since the circumferential flexible gripper 62 is installed on the rotary support seat 61, and the rotation axis of the rotary support seat 61 coincides with the bending center axis 511 of the elbow forming mold 3, i.e., it is arranged coaxially, it ensures that the rotation center is consistent with the theoretical curvature center of the outer protective tube 1 of the insulated elbow throughout the traction process.

[0039] As the screw extruder 2 continuously feeds material, the outer protective tube 1 of the insulated elbow is pushed forward continuously, and the end traction clamp 6 needs to move synchronously along the bending path. For this purpose, the rotary support 61 is slidably mounted on the arc-shaped transmission guide rail 51, precisely arranged along the bending path of the arc-shaped support slide rail 5, providing a precise guide trajectory for the rotary support 61. During the traction process, the rotary support 61 automatically rotates around the central axis 511 because it is coaxial with the outer protective tube 1 of the insulated elbow, avoiding torsional stress or lateral tension.

[0040] During the operation of the end traction clamp 6, the traction speed of the end traction clamp 6 is strictly synchronized with the extrusion rate of the screw extruder 2. When the screw extruder 2 feeds the hot outer protective tube material into the elbow forming die 3 at a constant speed, the end traction clamp 6 moves smoothly along the arc-shaped transmission guide rail 51 at a matching linear speed, ensuring that the outer protective tube 1 of the heat-insulated elbow does not accumulate or stretch or sag during the bending and forming process, thereby maintaining uniform wall thickness and continuous curvature.

[0041] Meanwhile, the main body of the outer protective tube 1 of the insulated elbow is supported on the arc-shaped support slide 5. The smooth curved surface of the arc-shaped support slide 5 matches the outer contour of the outer protective tube 1 of the insulated elbow, providing continuous and interference-free surface contact support. This effectively prevents the large-diameter hot insulated elbow outer protective tube 1 from sagging and becoming out of round due to its own weight, and also limits the swing of the insulated elbow. Compared with the method of relying solely on the lifting device 7 for traction and support, the arc-shaped support slide 5 in this device not only provides continuous and close-fitting bottom support, but also effectively constrains the insulated elbow in the radial and lateral directions through its smooth curved surface that matches the outer contour of the outer protective tube 1 of the insulated elbow. This effectively limits the swing of the outer protective tube 1 of the insulated elbow during the traction process, ensuring that the outer protective tube 1 of the insulated elbow always moves smoothly along the preset bending trajectory, greatly improving the forming accuracy.

[0042] Furthermore, throughout the entire traction and forming process, the end traction clamp 6 always acts as the main traction execution unit, precisely controlling the traction speed and maintaining synchronization with the extrusion rate of the screw extruder 2, ensuring that the outer protective tube 1 of the insulated elbow travels stably along the preset bending trajectory. Each lifting device 7 only provides auxiliary support in designated sections, its movements strictly avoiding the movement path of the end traction clamp 6. Without interfering with the normal operation of the end traction clamp 6, the inlet end lifting device 7 connects to the outer protective tube 1 at the initial stage when it enters the arc-shaped support slide 5, providing initial support. The outlet end lifting device 7 supports the end after the outer protective tube 1 is fully output from the tail. Together, they provide continuous auxiliary support throughout the entire length of the outer protective tube 1.

[0043] After the outer protective tube 1 of the insulated elbow is formed, the two lifting devices 7 at the inlet and outlet ends of the arc-shaped support slide 5 jointly support the entire outer protective tube 1 of the insulated elbow. It can be directly and smoothly lifted off the arc-shaped support slide 5 by external lifting equipment, thereby achieving efficient, non-destructive and automated off-line operation while ensuring forming accuracy.

[0044] See Figures 3 to 9 As shown, the arc-shaped support slide 5 is composed of two arc-shaped base supports 52, and a gap channel extending along the curved path is left between the two arc-shaped base supports 52. The end traction clamp 6 passes through the gap channel.

[0045] The arc-shaped support slide 5 is installed on a platform 21, and the platform 21 is provided with brackets 22 for fixing the two arc-shaped base supports 52.

[0046] As the outer protective tube 1 of the insulated elbow is continuously extruded and enters the support area, the bottom of the outer protective tube 1 needs to be supported by the curved surface throughout the entire process, while the end traction clamp 6 at the front end must move synchronously along the bending trajectory to complete the traction. To balance support and passage requirements, the arc-shaped support slide 5 uses two independent arc-shaped bottom supports 52 to support the lower sides of the outer protective tube 1 of the insulated elbow, with a gap channel naturally left in the middle extending along the bending path. The end traction clamp 6 passes directly through this gap during the traction process, ensuring unobstructed movement.

[0047] During the extrusion process, the outer protective tube 1 of the insulated elbow is stably supported, effectively suppressing sagging or cross-sectional deformation caused by its own weight. At the same time, the end traction clamp 6 can move smoothly and continuously along a precise curvature trajectory without interfering with the arc-shaped support slide 5, improving the geometric accuracy and surface integrity of the outer protective tube 1 of the large-diameter insulated elbow during continuous forming.

[0048] See Figures 5 to 9 As shown, the arc-shaped support slide 5 has a chamfered surface 521 at one end facing the elbow forming mold 3, and the chamfered surface 521 extends obliquely inward along the edge of the arc-shaped base 52.

[0049] During the transition from the outlet of the elbow forming mold 3 to the arc-shaped support slide 5, the outer protective tube 1 of the insulated elbow is pulled by the end traction clamp 6. Its front end first contacts the entrance end of the arc-shaped support slide 5. Because this end has a chamfered surface 521, that is, a smooth transition slope extending inward along the edge of the arc-shaped base 52, the outer wall of the outer protective tube 1 of the insulated elbow can smoothly slide into the support area, avoiding jamming, scratching or local stress concentration caused by right angles or abrupt contours, and effectively guiding the outer protective tube 1 of the insulated elbow smoothly into the arc-shaped support slide 5.

[0050] See Figure 6 and Figure 7As shown, a plurality of cooling nozzles 522 are provided at equal intervals on both sides of the arc-shaped support slide 5 along the curved path, and the spraying direction of the cooling nozzles 522 is toward the smooth curved surface inside the arc-shaped support slide 5.

[0051] During the continuous traction of the outer protective tube 1 of the insulated elbow along the arc-shaped support slide 5, its outer surface is in close contact with the smooth curved surface of the inner side of the arc-shaped support slide 5. To enhance the cooling and shaping effect, multiple cooling nozzles 522 installed on both sides of the arc-shaped support slide 5 work synchronously to ensure uniform cooling coverage without blind spots. The spray direction is towards the smooth curved surface of the inner side of the arc-shaped support slide 5, allowing the cooling medium to directly act on the outer wall surface of the contact area between the outer protective tube 1 of the insulated elbow and the arc-shaped support slide 5. A dynamic lubrication and cooling layer is formed on the contact surface, effectively reducing the surface temperature and friction coefficient of the arc-shaped support slide 5, making the outer protective tube 1 of the insulated elbow run more smoothly and stably during traction.

[0052] See Figures 3 to 7 As shown, the curved transmission guide rail 51 has a central shaft 511 at its bending center. A traction rod 512 is connected between the central shaft 511 and the rotary support 61. One end of the traction rod 512 is rotatably connected to the central shaft 511, and the other end is fixedly connected to the rotary support 61.

[0053] The traction rod 512 is driven by a rotary driver to rotate around the central axis 511, thereby driving the rotary support 61 to move and rotate synchronously along the arc-shaped transmission guide rail 51. The rotary driver can be a servo motor, stepper motor, hydraulic motor, or pneumatic motor, etc., preferably a servo motor to achieve high-precision position and speed control.

[0054] During operation, the rotary driver outputs rotational power after startup, driving the traction rod 512 connected to it to rotate around the central axis 511. The traction rod 512 drives the rotary support 61 to move along the arc-shaped transmission guide rail 51. This motion trajectory precisely matches the bending center line of the outer protective tube 1 of the insulated elbow, ensuring that the flexible gripper 62 mounted on the rotary support 61 can always hold the end of the outer protective tube 1 of the insulated elbow in the correct posture. Through the high-precision control of the rotation angle and speed of the traction rod 512 by the servo motor, the traction process can be strictly synchronized with the speed of the screw extruder 2, ensuring that the outer protective tube 1 of the insulated elbow is subjected to uniform force and consistent curvature during continuous traction, thereby ensuring the high-quality forming of the large-diameter outer protective tube 1 of the insulated elbow.

[0055] See Figures 6 to 12As shown, the circumferential flexible gripper 62 includes a fixed rod 621, an inner support member 622, and an outer clamping member 623. The fixed rod 621 is fixedly connected to the rotary support base 61. The inner support member 622 and the outer clamping member 623 are both installed on the fixed rod 621. An annular clamping space for accommodating the end of the outer protective tube 1 of the thermal insulation elbow is formed between the inner support member 622 and the outer clamping member 623.

[0056] Before the traction operation begins, the flexible gripper 62 first clamps the end of the outer protective tube 1 of the insulated elbow. At this time, the fixed rod 621 installed on the slewing support 61 serves as the entire rigid base. The inner support 622 integrated on it works in coordination with the outer clamp 623. The outer clamp 623 closes inward from the outer periphery of the outer protective tube 1 of the insulated elbow, while the inner support 622 inserts into the interior of the outer protective tube 1 of the insulated elbow for support. The entire clamping process is gentle and reliable, ensuring sufficient gripping force to transmit the traction load, and preventing the outer protective tube 1 of the insulated elbow from becoming out of round through the coordinated support of the inner and outer parts, thus laying the foundation for smooth traction along the arc trajectory.

[0057] See Figure 8 and Figures 10 to 12 As shown, the inner support 622 includes a collar 6221 and a rubber ring 6222. The collar 6221 is fixedly connected to the fixing rod 621. The rubber ring 6222 is sleeved on the outer periphery of the collar 6221 and is used to abut against the inner wall of the outer protective tube 1 of the heat insulation elbow in the clamped state.

[0058] During the clamping process, the circumferential flexible gripper 62 moves with the rotary support 61 to dock with the cooled and shaped end of the outer protective tube 1 of the insulation elbow. The collar 6221 fixed on the fixing rod 621 serves as a rigid support skeleton for the inner support 622 to maintain a stable position. The rubber ring 6222 fitted around its outer periphery enters the inner cavity of the outer protective tube 1 of the insulation elbow. As the outer clamp 623 closes from the outside to the inside, the wall of the outer protective tube 1 of the insulation elbow is subjected to radial clamping force, while its inner wall is elastically abutted by the rubber ring 6222.

[0059] Because the rubber ring 6222 has good flexibility and resilience, it can closely fit the inner wall contour of the outer protective tube 1 of the insulation elbow when clamped, forming a uniform supporting reaction force. This not only prevents the outer protective tube 1 of the insulation elbow from being crushed locally due to clamping, but also avoids scratches caused by hard contact.

[0060] See Figures 8 to 12As shown, the outer clamp 623 includes a plurality of arc-shaped clamping arms 6231, which are evenly distributed along the circumference of the fixing rod 621. The fixing rod 621 is provided with linear slide rails 6232 extending radially along the fixing rod 621 at the position corresponding to each arc-shaped clamping arm 6231. The arc-shaped clamping arms 6231 are slidably disposed on the linear slide rails 6232.

[0061] When the clamping action is initiated, multiple arc-shaped clamping arms 6231 slide synchronously along their respective corresponding linear slide rails 6232 toward the center of the fixed rod 621. Since the multiple arc-shaped clamping arms 6231 are evenly distributed along the circumference of the fixed rod 621, the multiple arc-shaped clamping arms 6231 can approach the outer wall of the outer protective tube 1 of the insulation elbow in a symmetrical and balanced manner during the inward closing process, so as to achieve uniform circumferential force application and ensure the concentricity and stability of the clamping force.

[0062] See Figures 9 to 12 As shown, each arc-shaped clamping arm 6231 has a flexible pad 6233 on its inner side, and each arc-shaped clamping arm 6231 has a return spring 6234 on its outer side. Each linear slide rail 6232 has an end plate 624 at its outer end. One end of the return spring 6234 is fixedly connected to the arc-shaped clamping arm 6231, and the other end is fixedly connected to the end plate 624.

[0063] During clamping, multiple arc-shaped clamping arms 6231 slide along the linear slide rail 6232 toward the center of the fixed rod 621. The flexible pads 6233 on their inner sides then adhere to the outer wall of the outer protective tube 1 of the insulation elbow, forming a uniform and soft contact surface, effectively buffering the clamping force and preventing the surface of the insulation elbow from being scratched or damaged. At the same time, the return springs 6234 located on the outer side of each arc-shaped clamping arm 6231 are stretched, storing elastic potential energy.

[0064] Once the clamping task is completed and the driving force is removed, the return spring 6234 releases energy, pushing each arc-shaped clamping arm 6231 to retract outward synchronously along the linear slide rail 6232, returning to the initial open position, and preparing for the next clamping action.

[0065] See Figures 8 to 12 As shown, the outer clamp 623 also includes a driving pressure plate 625, which is slidably disposed on the fixed rod 621. The driving pressure plate 625 is provided with a pressure block 6251 at the position corresponding to each arc-shaped clamping arm 6231, and the pressure block 6251 and the corresponding arc-shaped clamping arm 6231 are provided with mutually cooperating inclined surfaces.

[0066] The fixed rod 621 is provided with a sleeve 6252 fixedly connected to the rotary support 61. A piston sleeve 6253 is fixedly provided on the outer side of the drive pressure plate 625. The piston sleeve 6253 is sleeved on the outer circumference of the sleeve 6252 and slides and seals with the sleeve 6252. A tension spring 6254 is provided between the piston sleeve 6253 and the sleeve 6252. The piston sleeve 6253, the sleeve 6252 and the fixed rod 621 together form a pneumatic chamber. The fixed rod 621 is provided with a gas passage 6211 communicating with the pneumatic chamber along its axial direction.

[0067] When compressed air enters the pressure chamber through the gas passage 6211, it pushes the piston sleeve 6253 to move axially along the sleeve 6252, driving the drive plate 625 forward. This causes the arc-shaped clamping arm 6231 to retract radially through the inclined surface, clamping the outer protective tube 1 of the insulation elbow. When the pressure chamber is depressurized, the tension spring 6254 pulls the piston sleeve 6253 back to its original position, automatically releasing the arc-shaped clamping arm 6231.

[0068] The present invention provides continuous surface contact support for the outer protective pipe 1 of the thermal insulation elbow through the arc-shaped support slide 5, combined with the end traction clamp 6 pulling at a constant speed along the preset bending trajectory, and supplemented by the coordinated support of the end hangers 7 in the key sections, effectively suppressing the sagging, swinging or trajectory deviation of the outer protective pipe 1 of the large-diameter thermal insulation elbow caused by its own weight.

[0069] Meanwhile, the cooling nozzles 522 on both sides of the slide form a dynamic lubrication and cooling layer on the contact surface, reducing frictional resistance and ensuring smooth traction. The traction action is precisely driven by a servo motor, achieving strict synchronization between extrusion and traction speeds, ensuring consistent curvature and uniform stress on the outer protective tube 1 of the insulated elbow, and improving molding quality.

[0070] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A continuous forming device for an integrated heat-insulating elbow outer protective pipe, comprising a screw extruder, an elbow forming die, and a cooling and shaping section, wherein the discharge port of the screw extruder is connected to the elbow forming die, and the cooling and shaping section is disposed at the outlet end of the elbow forming die; Its features are, It also includes an elbow support mechanism, which comprises: An arc-shaped support slide extends along the bending center line of the elbow forming mold. The arc-shaped support slide is located below the outer protective tube of the heat-insulating elbow. The inner surface of the arc-shaped support slide is a smooth curved surface that matches the outer contour of the outer protective tube of the heat-insulating elbow. An end-traction clamp is set on the trajectory line of the arc-shaped support slide, including a rotary support base and a ring-shaped flexible gripper. The rotary support base is arranged coaxially with the elbow forming mold, and the ring-shaped flexible gripper is installed on the rotary support base. Below the arc-shaped support slide is an arc-shaped transmission guide rail, and the rotary support seat is slidably mounted on the arc-shaped transmission guide rail, which is arranged along the curvature path of the arc-shaped support slide.

2. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 1, characterized in that, The arc-shaped support slide is composed of two arc-shaped bases, with a gap channel extending along the curved path between the two arc-shaped bases, and the end traction clamp is inserted into the gap channel.

3. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 2, characterized in that, The arc-shaped support slide has a chamfered surface at one end facing the bend forming mold, and the chamfered surface extends obliquely inward along the edge of the arc-shaped base.

4. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 3, characterized in that, The arc-shaped support slide has several cooling nozzles evenly spaced on both sides along the curved path, and the spray direction of the cooling nozzles is towards the smooth curved surface inside the arc-shaped support slide.

5. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 1, characterized in that, The curved transmission guide rail has a central shaft at its bending center. A traction rod is connected between the central shaft and the rotary support. One end of the traction rod is rotatably connected to the central shaft, and the other end is fixedly connected to the rotary support.

6. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 1, characterized in that, The circumferential flexible gripper includes a fixed rod, an inner support member, and an outer clamping member. The fixed rod is fixedly connected to the rotary support base. The inner support member and the outer clamping member are both installed on the fixed rod. An annular clamping space is formed between the inner support member and the outer clamping member to accommodate the end of the outer protective pipe of the thermal insulation elbow.

7. The continuous forming device for the outer protective pipe of an integrated insulated elbow according to claim 6, characterized in that, The inner support includes a collar and a rubber ring. The collar is fixedly connected to the fixing rod, and the rubber ring is sleeved on the outer circumference of the collar to abut against the inner wall of the outer protective pipe of the insulation elbow in the clamped state.

8. The continuous forming device for the outer protective pipe of an integrated thermal insulation elbow according to claim 6, characterized in that, The outer clamp includes multiple arc-shaped clamping arms, which are evenly distributed along the circumference of the fixed rod. The fixed rod is provided with a linear slide rail extending radially along the fixed rod at the position corresponding to each arc-shaped clamping arm, and the arc-shaped clamping arm is slidably mounted on the linear slide rail.

9. The continuous forming device for the outer protective pipe of an integrated thermal insulation elbow according to claim 8, characterized in that, Each arc-shaped clamp arm has a flexible pad on its inner side and a return spring on its outer side. Each linear slide rail has an end plate at its outer end. One end of the return spring is fixedly connected to the arc-shaped clamp arm and the other end is fixedly connected to the end plate.

10. The continuous forming device for the outer protective pipe of an integrated thermal insulation elbow according to claim 9, characterized in that, The outer clamp also includes a driving pressure plate, which is slidably mounted on the fixed rod. The driving pressure plate has a pressure block at the position corresponding to each arc-shaped clamping arm, and the pressure block and the corresponding arc-shaped clamping arm have mutually cooperating inclined surfaces.

Images