An apparatus for preparing a pvdf pipe having a joint and a method thereof
Through a continuous process of clamping, local heating, transfer, extrusion molding, and cooling and shaping of PVDF pipes, in-situ integrated molding of PVDF pipe joints is achieved, solving the problems of complex existing processes and weak welding, and improving the reliability and mechanical properties of the pipes.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GUANGZHOU GOALAND ENERGY CONSERVATION TECH
- Filing Date
- 2026-04-30
- Publication Date
- 2026-06-26
AI Technical Summary
The existing PVDF pipe manufacturing process is complex, and the welded connections result in weak structures and poor material consistency, which affects the reliability and mechanical properties of the pipes.
Through a continuous process of clamping, local heating, transfer, extrusion molding, and cooling, PVDF pipe fittings are integrally formed in situ, simplifying the manufacturing process, eliminating welding connections, and ensuring material consistency.
It simplifies the manufacturing process, improves processing efficiency, enhances the structural reliability and mechanical properties of the pipeline, reduces weak points, and improves overall reliability in use.
Smart Images
Figure CN122275283A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of PVDF pipe manufacturing technology, and in particular to an apparatus and method for manufacturing PVDF pipes with joints. Background Technology
[0002] Polyvinylidene fluoride (PVDF) pipes are widely used in liquid cooling systems. PVDF pipes typically require connectors to connect different pipe sections. Currently, existing PVDF pipe manufacturing processes usually employ a split manufacturing method. This involves first preparing PVDF pipe connectors from PVDF raw material granules using injection molding, then cutting the pipe to the required length to obtain PVDF pipes, and finally joining the connectors to the cut pipes using butt welding to obtain a PVDF pipe with joints.
[0003] However, the existing processes described above require multiple steps, including injection molding, pipe cutting, and butt welding, resulting in a complex manufacturing process and low production efficiency. Secondly, butt welding inevitably creates weld seams at the connection point, which often become weak points in the structure, prone to leakage and cracking during long-term use, thus affecting the overall reliability of the pipeline. Furthermore, because the pipe fittings and pipes are formed using different processes, their internal material structures and property distributions may differ, leading to poor overall material consistency after connection, further impacting the pipeline's mechanical properties and service life. Summary of the Invention
[0004] This application aims to address at least one of the technical problems existing in the prior art. This application provides an apparatus and method for manufacturing PVDF pipes with joints, which simplifies existing manufacturing processes, eliminates structural defects caused by welded connections, and improves the structural reliability of PVDF pipes with joints.
[0005] A method for preparing a PVDF pipe with a joint according to an embodiment of the first aspect of this application includes: Material cutting: Cut the PVDF pipe according to the required dimensions to obtain the PVDF pipe to be processed; Clamping: The PVDF pipe to be processed is clamped by the clamping mechanism; Local heating: The end forming area of the PVDF pipe to be processed is heated to make the end forming area reach a molten state, so as to obtain the pre-processed PVDF pipe; Transfer: Transfer the pre-processed PVDF pipe from the heating station to the molding die station; Extrusion molding: The molten end forming area is extruded through a molding die to form a pipe joint of a preset shape; Cooling and shaping: The joint is cooled while still under extrusion until the temperature drops to the preset range, then it is demolded to obtain an integrally formed PVDF pipe.
[0006] The method for preparing a PVDF pipe with a joint according to the embodiments of this application has at least the following beneficial effects: The method for preparing PVDF pipes with joints according to this application includes six steps: blanking, clamping, local heating, transfer, extrusion molding, and cooling and shaping. First, the PVDF pipe is cut according to the required dimensions to obtain the PVDF pipe to be processed. Then, the PVDF pipe is clamped by a clamping mechanism, and its end forming area is placed in a heating station. While clamped, the end forming area is locally heated, gradually increasing its temperature until it reaches a molten state, thus obtaining a pre-processed PVDF pipe. After the end forming area reaches a molten state, the pre-processed PVDF pipe is transferred from the heating station to the molding die station, maintaining the clamping state during the transfer. In the molding die station, the molten end forming area is extruded by the molding die, causing plastic deformation under the constraint of the mold cavity to form a pipe joint of a preset shape. After extrusion molding, the extrusion state is maintained, and the pipe joint is cooled to gradually solidify and shape; when the temperature drops to a preset range, it is demolded, thus obtaining a one-piece molded PVDF pipe. The method for manufacturing PVDF pipes with joints disclosed in this application achieves in-situ integrated molding of PVDF pipe joints through a continuous process of material preparation, clamping, local heating, transfer, extrusion molding, and cooling. This simplifies the injection molding and welding processes in traditional manufacturing, improving processing efficiency. Furthermore, the PVDF pipes with joints prepared by this method are integrally formed from a single piece of pipe material, eliminating welded or other connecting interfaces. This reduces structural weak points and results in a more uniform distribution of material properties, improving overall mechanical properties and significantly enhancing the overall reliability of the pipe.
[0007] According to some embodiments of this application, in the local heating step, the end forming area is heated to 170°C-300°C.
[0008] According to some embodiments of this application, in the local heating step, based on the change in light transmittance of the PVDF material during the heating process, when the light transmittance of the end forming area increases significantly and it appears transparent, it is determined that the end forming area has reached a molten state.
[0009] According to some embodiments of this application, in the cooling and shaping step, demolding is performed when the temperature drops to 30°C-50°C.
[0010] According to some embodiments of this application, in the extrusion molding step, the clamping mechanism clamps the pre-processed PVDF pipe and pushes it vertically toward the molding die, so that the end forming area in the molten state enters the cavity of the molding die. With the cooperation of the clamping mechanism, the mold closing extrusion molding is completed, and the mold is cooled and shaped in the mold closing state.
[0011] An apparatus for preparing a PVDF pipe with a joint, according to an embodiment of the second aspect of this application, is applied to the method for preparing a PVDF pipe with a joint as described in any of the above embodiments, the apparatus comprising: A clamping mechanism for clamping and positioning PVDF pipes; A heating mechanism is located at the heating station and is used to heat the end forming area of the PVDF pipe to a molten state, thereby obtaining a pre-processed PVDF pipe. A molding die, located at the molding die station, having a cavity of a preset shape, is used to extrude and mold the molten end forming area to form a pipe joint; A transfer mechanism, connected to the clamping mechanism, is used to transfer the pre-processed PVDF pipe between the heating station and the forming mold station; The clamping mechanism is able to maintain the clamping state of the PVDF pipe during heating, transfer and forming processes, and the forming mold is able to shape the end forming area during cooling.
[0012] According to some embodiments of this application, the clamping mechanism includes a first clamp and a second clamp, which together clamp the PVDF pipe through the cooperation of the first clamp and the second clamp.
[0013] According to some embodiments of this application, the transfer mechanism includes a lifting component and a horizontal moving component, so that the clamping mechanism can perform three-dimensional movement.
[0014] According to some embodiments of this application, the cavity is an annular cavity.
[0015] According to some embodiments of this application, the molding die has a protrusion on the inner side of the annular cavity, and the diameter of the protrusion matches the inner diameter of the PVDF pipe.
[0016] The apparatus for preparing PVDF pipes with joints described in this application is applied to the method of the above embodiments and therefore has the same beneficial effects, which will not be repeated here. Attached Figure Description
[0017] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of an apparatus for preparing a PVDF pipe with a joint, according to an embodiment of this application. Figure 2 for Figure 1 Another structural diagram; Figure 3 for Figure 2 A cross-sectional schematic diagram of surface AA; Figure 4 This is a flowchart illustrating a method for preparing a PVDF pipe with joints according to an embodiment of this application.
[0018] Figure label: Clamping mechanism 10; First chuck 11; Second chuck 12; 20; mold; cavity; protrusion; PVDF pipe 100; fitting 110. Detailed Implementation
[0019] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0020] In the description of this application, it should be understood that the use of terms such as "center," "middle," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings and is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0022] The following reference Figures 1 to 4 This application describes an apparatus and method for preparing PVDF pipes with joints, as described in the embodiments of this application.
[0023] according to Figures 1 to 3 As shown, an embodiment of the present application describes an apparatus for preparing a PVDF pipe with a joint, comprising a clamping mechanism 10, a heating mechanism (not shown), a transfer mechanism (not shown), and a forming mold 20.
[0024] The clamping mechanism 10 clamps and positions the PVDF pipe 100, providing axial and radial positioning constraints to maintain a stable posture during processing. A heating mechanism (not shown) is located at a heating station and locally heats the end forming area of the PVDF pipe 100 to a molten state, obtaining a pre-processed PVDF pipe 100. A forming mold 20 (not shown) is located at a forming mold station and has a pre-shaped cavity 21 for extruding the molten end forming area to form a pipe joint 110. A transfer mechanism is connected to the clamping mechanism 10 and drives it to transfer between the heating station and the forming mold station, thereby switching the clamped PVDF pipe 100 between different processing stations. Furthermore, the clamping mechanism 10 maintains clamping of the PVDF pipe 100 throughout the heating, transfer, and forming processes, ensuring the entire processing is based on the same positioning reference and improving processing stability. During the cooling process, the molding die 20 constrains and shapes the end forming area.
[0025] according to Figures 1 to 4 As shown, an embodiment of this application describes a method for preparing a PVDF pipe with a joint, comprising the following steps.
[0026] S100. Cutting: Cut the PVDF pipe according to the required dimensions to obtain the PVDF pipe 100 to be processed.
[0027] S200. Clamping: The PVDF pipe 100 to be processed is clamped by the clamping mechanism 10 to keep the PVDF pipe 100 in a stable position.
[0028] S300. Local heating: Clamp the PVDF pipe 100 to be processed and place it in the heating station. While clamped, the forming area at the end is locally heated so that the temperature of the forming area at the end gradually rises and reaches a molten state, thereby obtaining the pre-processed PVDF pipe 100.
[0029] S400. Transfer: After the end forming area reaches the molten state, the pre-processed PVDF pipe 100 is transferred from the heating station to the forming mold station, and the PVDF pipe 100 is kept in a clamping state during the transfer process.
[0030] S500. Extrusion molding: In the molding die station, the end forming area in the molten state is extruded by the molding die 20, so that the end forming area undergoes plastic deformation under the constraint of the cavity 21 of the molding die 20 and forms a pipe joint 110 of a preset shape.
[0031] S600. Cooling and Shaping: After extrusion molding, the pipe fitting 110 is kept under extrusion and cooled to gradually solidify and shape. When the temperature drops to the preset range, it is demolded to obtain the integrally formed PVDF pipe 100.
[0032] The method for manufacturing PVDF pipes with joints disclosed in this application achieves in-situ integrated molding of the PVDF pipe joint 110 through a continuous process of material preparation, clamping, local heating, transfer, extrusion molding, and cooling. This simplifies the injection molding and welding processes in traditional manufacturing and improves processing efficiency. Furthermore, the PVDF pipes with joints prepared by this method are integrally formed from a single piece of pipe material, eliminating welded or other connecting interfaces. This reduces structural weak points and results in a more uniform distribution of material properties, improving overall mechanical properties and significantly enhancing the overall reliability of the pipe.
[0033] according to Figure 4 As shown, in one embodiment of this application, in the S300 local heating step, the end forming area is heated to 170°C-300°C, so that the PVDF material can be fully melted to meet the subsequent molding requirements, and the carbonization of the PVDF material due to excessive temperature can be avoided, thereby maintaining the mechanical properties and stability of the material while ensuring the molding performance.
[0034] according to Figure 4As shown, in one embodiment of this application, during the S300 local heating step, the appearance change of the end-forming area is observed simultaneously. Based on the change in light transmittance of the PVDF material during heating, as the temperature rises, the end-forming area gradually changes from an initial opaque state. When the internal structure of the PVDF material melts, its light transmittance significantly increases. When the light transmittance of the end-forming area significantly increases and it becomes transparent, it is determined that the end-forming area has reached a molten state.
[0035] according to Figure 3 and Figure 4 As shown, in one embodiment of this application, during the S600 cooling and shaping step, the PVDF pipe joint 110 is fully cured when the temperature drops to 30°C-50°C. By releasing the constraint of the molding die 20, the molding die 20 can be opened and the integrally formed PVDF pipe 100 can be taken out.
[0036] according to Figures 1 to 3 As shown, in one embodiment of this application, the clamping mechanism 10 includes a first clamp 11 and a second clamp 12. At least one of the first clamp 11 and the second clamp 12 is connected to an external drive member, allowing the first clamp 11 and the second clamp 12 to move closer or further apart to achieve clamping and releasing actions. The cooperation of the first clamp 11 and the second clamp 12 enables them to jointly clamp the PVDF pipe 100.
[0037] according to Figure 3 and Figure 4 As shown, in one embodiment of this application, in the S500 extrusion molding step, at the molding die station, the first chuck 11 and the second chuck 12 of the clamping mechanism 10 jointly clamp the pre-processed PVDF pipe 100 and push it vertically toward the molding die 20, so that the molten end forming area enters the cavity 21 of the molding die 20. During the pushing process, the molten end material begins to undergo plastic deformation under the action of external force, and continues to flow and fill the cavity 21 space under the constraint of the cavity 21 wall. As the clamping mechanism 10 continues to push, the molten end material is subjected to extrusion force under the combined action of the clamping mechanism 10 and the molding die 20, thereby forming a pipe joint 110 structure of a preset shape. In this process, the clamping mechanism 10 plays a clamping role while also playing an active pushing and extruding role.
[0038] according to Figure 2 and Figure 3 As shown, in one embodiment of this application, the cavity 21 is an annular cavity 21 to form an annular pipe joint 110.
[0039] according to Figure 3As shown, in one embodiment of this application, the molding die 20 has a protrusion 22 on the inner side of the annular cavity 21. The diameter of the protrusion 22 matches the inner diameter of the PVDF pipe 100. The protrusion 22 can extend into the interior of the PVDF pipe 100 in the S500 extrusion molding step to support the inner wall of the pipe and prevent the PVDF pipe 100 from deforming and sinking inward under the clamping force of the clamping mechanism 10.
[0040] according to Figures 1 to 3 As shown, in one embodiment of this application, the transfer mechanism includes a lifting component (not shown) and a horizontal moving component (not shown). The lifting component drives the clamping mechanism 10 to move vertically, and the horizontal moving component drives the clamping mechanism 10 to move horizontally, so that the clamping mechanism 10 can perform three-dimensional movement. Both the lifting component and the horizontal moving component are prior art and will not be described further here.
[0041] In the description of this specification, the use of terms such as "an embodiment," "some examples," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0042] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.
Claims
1. A method for preparing PVDF pipes with joints, characterized in that: Including steps Material cutting: Cut the PVDF pipe according to the required dimensions to obtain the PVDF pipe to be processed; Clamping: The PVDF pipe to be processed is clamped by the clamping mechanism; Local heating: The end forming area of the PVDF pipe to be processed is heated to make the end forming area reach a molten state, so as to obtain the pre-processed PVDF pipe; Transfer: Transfer the pre-processed PVDF pipe from the heating station to the molding die station; Extrusion molding: The molten end forming area is extruded through a molding die to form a pipe joint of a preset shape; Cooling and shaping: The joint is cooled while still under extrusion until the temperature drops to the preset range, then it is demolded to obtain an integrally formed PVDF pipe.
2. The method for preparing a PVDF pipe with a joint according to claim 1, characterized in that: In the local heating step, the end forming area is heated to 170°C-300°C.
3. The method for preparing a PVDF pipe with a joint according to claim 1 or 2, characterized in that: In the local heating step, based on the change in light transmittance of the PVDF material during the heating process, when the light transmittance of the end forming area increases significantly and it becomes transparent, it is determined that the end forming area has reached the molten state.
4. The method for preparing a PVDF pipe with a joint according to claim 1, characterized in that: In the cooling and shaping step, demolding is performed when the temperature drops to 30°C-50°C.
5. The method for preparing a PVDF pipe with a joint according to claim 1, characterized in that: In the extrusion molding step, the clamping mechanism clamps the pre-processed PVDF pipe and pushes it vertically toward the molding die, so that the end forming area in the molten state enters the cavity of the molding die. With the cooperation of the clamping mechanism, the mold closing extrusion molding is completed, and the pipe is cooled and shaped in the mold closing state.
6. An apparatus for preparing PVDF pipes with joints, characterized in that: The apparatus used in the method for preparing a PVDF pipe with a joint according to any one of claims 1 to 5 includes... A clamping mechanism for clamping and positioning PVDF pipes; A heating mechanism is located at the heating station and is used to heat the end forming area of the PVDF pipe to a molten state, thereby obtaining a pre-processed PVDF pipe. A molding die, located at the molding die station, having a cavity of a preset shape, is used to extrude and mold the molten end forming area to form a pipe joint; A transfer mechanism, connected to the clamping mechanism, is used to transfer the pre-processed PVDF pipe between the heating station and the forming mold station; The clamping mechanism is able to maintain the clamping state of the PVDF pipe during heating, transfer and forming processes, and the forming mold is able to shape the end forming area during cooling.
7. The apparatus for preparing a PVDF pipe with a joint according to claim 6, characterized in that: The clamping mechanism includes a first clamp and a second clamp, which work together to clamp the PVDF pipe.
8. The apparatus for preparing a PVDF pipe with a joint according to claim 6, characterized in that: The transfer mechanism includes a lifting component and a horizontal moving component, enabling the clamping mechanism to perform three-dimensional movement.
9. The apparatus for preparing a PVDF pipe with a joint according to claim 6, characterized in that: The cavity is an annular cavity.
10. The apparatus for preparing a PVDF pipe with a joint according to claim 9, characterized in that: The molding die has a protrusion on the inner side of the annular cavity, and the diameter of the protrusion matches the inner diameter of the PVDF pipe.