PVC online expansion extrusion assembly

Abstract

The utility model relates to the technical field of PVC (polyvinyl chloride) pipe production, in particular to an on-line expansion extrusion device for PVC pipes, which comprises an extrusion component, an expansion component and a driving part, an extrusion channel is arranged in the extrusion component and provided with a discharge port, the expansion component comprises a telescopic screw component and a connecting shaft, one end of the connecting shaft is positioned in the extrusion channel, and the other end of the connecting shaft is positioned in the discharge port. The other end of the connecting shaft extends out of the discharge hole and is in sliding connection with the telescopic screw component; the connecting shaft is hollow, a connecting rod is arranged in the connecting shaft, and one end of the connecting rod is in threaded connection with the telescopic hook assembly. And the driving piece is connected with one end, positioned in the extrusion channel, of the connecting rod so as to drive the connecting rod to rotate and drive the telescopic screw component to act along the radial direction. The two-way stretching mechanism can directly carry out axial and radial two-way stretching on a PVC pipe extrusion production line, is reliable in structure, and is not easy to change the structure of the PVC pipe due to deformation of the mold.

Description

Technical Field

[0001] The utility model relates to the technical field of PVC pipe production, and more specifically to an online expansion extrusion component for PVC pipes. Background Art

[0002] PVC-O pipe, whose full name is biaxially oriented polyvinyl chloride pipe, is a new type of pipe manufactured using advanced production equipment and special orientation processing technology. This technology stretches the PVC-U pipe originally produced by extrusion in both the axial and radial directions, so that the polymer chains in the pipe are regularly arranged in the biaxial directions to form a network structure, thereby significantly improving the strength, toughness, impact resistance and fatigue resistance of the pipe. The performance of this pipe is far superior to that of traditional PVC-U pipe, with higher design stress and water flow capacity, while having thinner wall thickness, less material consumption and lower cost. The existing production process mainly uses an "offline" processing method, that is, the extruded and cooled PVC-U pipe section is expanded to the desired size by heating and pressurizing in the mold, but this method has low production efficiency and high equipment investment.

[0003] A Chinese invention, publication number CN110815802A, discloses a method for manufacturing PVC-O pipe and an expansion device therefor. The method is characterized in that, during biaxial stretching of a PVC-U embryonic tube produced by extrusion, the expansion device employed is an expansion device with an expandable or contractible radial cross-sectional area. The expansion device for producing PVC-O pipe comprises a tie rod and a frame portion whose expansion or contraction is controlled by the axial movement of the tie rod. The frame portion comprises multiple brackets, with auxiliary portions disposed between the brackets. The auxiliary portions are made of a flexible material and can be folded or tightened. When the frame portion is expanded, it forms a tapered section with a gradually increasing diameter and a cylindrical section with a constant diameter, with the cylindrical section connected to the larger end of the tapered section. Because the expansion device can be expanded or contracted, it can be pre-placed into the PVC-U embryonic tube in a contracted state and then expanded before the orientation process begins.

[0004] In the above-mentioned technical solution, the auxiliary portion is made of a flexible material and is prone to deformation. During expansion, the pressure from the PVC-U embryo tube cannot guarantee that its shape will remain unchanged, causing the inner wall structure of the expanded PVC-O tube to change. Furthermore, since the pressure from the expansion device is borne entirely by the stent during expansion, the rod-shaped stent is susceptible to bending when subjected to excessive radial pressure, resulting in structural reliability concerns. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a PVC pipe online expansion extrusion component, which can directly perform axial and radial bidirectional stretching on the PVC pipe extrusion production line, and has a reliable structure and is not easily affected by mold deformation, which may cause the PVC pipe structure to change.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a PVC pipe online expansion extrusion device, including an extrusion component, an expansion component and a driving component, the extrusion component is provided with an extrusion channel, the extrusion channel has a discharge port, the expansion component includes a telescopic frame component and a connecting shaft, one end of the connecting shaft is located in the extrusion channel, and the other end of the connecting shaft extends out of the discharge port and is slidingly connected to the telescopic frame component; the connecting shaft is hollow inside, and a connecting rod is provided in the connecting shaft, one end of the connecting rod is threadedly connected to the telescopic frame component, and the driving component is connected to one end of the connecting rod located in the extrusion channel to drive the connecting rod to rotate and drive the telescopic frame component to move along its radial direction.

[0007] In this technical solution, an extrusion assembly is used to produce PVC-U pipes. An extrusion channel is provided in the extrusion assembly. During production, raw materials in a molten state are fed from the feed port of the extrusion assembly. As the raw materials move in the extrusion channel, they gradually cool and solidify, and eventually a PVC-U pipe with a fixed shape is produced from the discharge port of the extrusion assembly. The feed port of the extrusion assembly continuously feeds raw materials, and the excess raw materials continuously extrude the already formed PVC-U pipe from the extrusion assembly, thereby achieving continuous production of PVC-U pipes. Although the PVC-U pipes produced from the discharge port of the extrusion assembly have been solidified and formed, they still have a certain temperature that makes the PVC-U pipes easy to stretch, so that the PVC-U pipes do not need to be preheated twice. The extrusion assembly's outlet is equipped with an expansion assembly, comprising a telescoping mechanism and a connecting shaft. One end of the connecting shaft is fixed to the extrusion assembly's outlet, guiding the PVC-U pipe. The diameter of the connecting shaft is smaller than the inner diameter of the PVC-U pipe, allowing unimpeded extrusion of the PVC-U pipe from the extrusion assembly while restricting its axial movement along the connecting shaft. The other end of the connecting shaft is equipped with a telescoping mechanism. This mechanism can be made of a non-deformable solid material, allowing it to withstand significant pressure without deformation, ensuring that the resulting PVC-U pipe meets the required requirements. The telescoping mechanism has a variable diameter. When the PVC-U pipe has not yet moved into the telescoping mechanism, the telescoping mechanism is in a retracted state, with a diameter equal to or smaller than the inner diameter of the PVC-U pipe, allowing it to be smoothly inserted into the PVC-U pipe. Once the PVC-U pipe discharge stabilizes, one end of the PVC-U pipe is removed from the telescopic assembly and introduced into the traction machine. The telescopic assembly then expands, changing from a small diameter to a large diameter, causing the PVC-U pipe to be radially stretched by the telescopic assembly. Simultaneously, the change in the diameter of the telescopic assembly alters the friction between the telescopic assembly and the inner wall of the PVC-U pipe, creating a speed difference between different parts of the PVC-U pipe. This axial stretching of the PVC-U pipe ultimately results in the PVC-U pipe being stretched into PVC-O. A drive element is also provided for driving the telescopic assembly. A connecting rod is disposed within the connecting shaft, one end of which is threadedly connected to the telescopic assembly. The drive element is connected to the end of the connecting rod located in the extrusion channel. By rotating the connecting rod, the drive element drives the telescopic assembly in its radial direction.

[0008] Preferably, the telescopic core assembly comprises a core, a large core die and a small core die, the core is threadedly connected with the connecting rod, the large core die and the small core die are respectively slidably connected with the connecting shaft along the radial direction of the connecting shaft, the large core die and the small core die are sequentially and spacedly arranged on the peripheral surface of the core, the large core die and the small core die are slidably connected with the core along the length direction of the core, when the small core die is located inside the large core die, each large core die forms a first peripheral surface; when the connecting rod drives the core to move linearly, the core drives the small core die to be inserted between two adjacent large core dies, each large core die and each small core die jointly form a second peripheral surface.

[0009] Preferably, the core is a conical polyhedral structure, a plurality of first side surfaces are arranged on the core, a second side surface is arranged between two adjacent first side surfaces, the large core die is slidably connected with the first side surface, and the small core die is slidably connected with the second side surface.

[0010] Preferably, the first side surface forms a first inclination angle with the central axis of the core, and the second side surface forms a second inclination angle with the central axis of the core, the second inclination angle is twice the first inclination angle.

[0011] Preferably, a first sliding groove / first sliding rail is arranged on each of the first side surface and the second side surface, a second sliding block / second sliding groove is arranged on the side of each large core die and small core die close to the core, and the second sliding block / second sliding groove is slidably connected with the corresponding first sliding groove / first sliding rail.

[0012] Preferably, a third sliding groove is arranged on the end of the connecting shaft close to the core in a radial manner, and a third sliding block is arranged on the end of each large core die and small core die close to the connecting shaft, the third sliding groove is slidably connected with the third sliding block.

[0013] Preferably, a first threaded hole is arranged on the end of the core close to the connecting shaft, a mounting hole is arranged in the center of the connecting shaft, the connecting rod is rotatably mounted in the mounting hole, one end of the connecting rod is connected with the first threaded hole, and the other end of the connecting rod is connected with the driving member.

[0014] Preferably, the extrusion assembly includes a mold body, a mold cavity is provided in the mold body, a diverter cone is provided in the mold cavity, the diverter cone includes an outer ring, an inner ring and a cone, the outer ring is fixed on the mold body, the inner ring is provided on the inner side of the outer ring, the outer ring is coaxial with the inner ring, a support plate is provided between the outer ring and the inner ring, the two ends of the support plate are respectively connected to the inner wall surface of the outer ring and the outer wall surface of the inner ring, the extrusion channel is formed between the outer ring, the inner ring and the support plate, the cone is fixed on the end face of the inner ring close to the feed port of the mold body, and also includes an inner core, the inner core is fixed on the end face of the inner ring close to the discharge port, and the end of the inner core close to the discharge port is connected to the connecting shaft.

[0015] Preferably, the driving member is installed on the outer wall surface of the mold body, and a connecting hole is provided on the diverter cone, extending from the outer wall surface of the outer ring through the support plate to the inner wall surface of the inner ring. The driving end of the driving member is connected to a transmission member, and the transmission member extends from the connecting hole into the inner wall surface of the inner ring and is connected to the connecting rod for transmission.

[0016] Preferably, a first sprocket is provided at the driving end of the driving member, a second sprocket is provided at the end of the connecting rod close to the inner ring, and the transmission member is a transmission chain, which is wound around the first sprocket and around the second sprocket through the connecting hole.

[0017] Compared with the prior art, the present technical solution has the following beneficial effects: the present invention provides an expansion device with a telescopic assembly. The telescopic assembly can be made of a solid material that is not easily deformed, allowing the telescopic assembly to withstand high pressure without deformation, ensuring that the PVC-U pipe produced by the telescopic assembly meets the requirements. The telescopic assembly has a variable diameter. When the telescopic assembly has a small diameter, it can smoothly extend into the interior of the PVC-U pipe. When the telescopic assembly has a large diameter, it can radially stretch the PVC-U pipe and simultaneously increase the friction between the telescopic assembly and the PVC-U pipe, creating a speed difference between different parts of the PVC-U pipe to produce a radial stretching effect. A drive member is also provided to drive the expansion device to achieve automated extension and contraction of the telescopic assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a three-dimensional diagram of the utility model PVC pipe online expansion extrusion assembly;

[0019] Figure 2 This is an exploded view of the utility model PVC pipe online expansion extrusion assembly;

[0020] Figure 3 This is a half-section diagram of the utility model PVC pipe online expansion extrusion assembly;

[0021] Figure 4 This is a three-dimensional diagram of the core in the in-line expansion extrusion assembly of the PVC pipe of the utility model;

[0022] Figure 5 This is a three-dimensional diagram of the large die in the in-line expansion extrusion assembly of the PVC pipe of the utility model;

[0023] Figure 6 It is a stereoscopic diagram of a connecting shaft in an in-line expansion extrusion assembly of a PVC pipe according to the present invention.

[0024] In the accompanying drawings: 1. Extrusion assembly; 2. Expansion assembly 2; 3. Driving member; 4. Extrusion channel; 5. Discharge port; 11. Mold body; 12. Diverter cone; 13. Transmission chain; 14. First sprocket; 15. Second sprocket; 21. Telescopic cone assembly; 22. Connecting shaft; 23. First slide groove; 24. First slide rail; 25. Second slider; 121. Outer ring; 122. Inner ring; 123. Cone; 124. Support plate; 125. Connecting hole; 211. Core; 212. Large mold; 213. Small mold; 214. First side; 215. Second side; 216. First threaded hole; 217. Third slider; 221. Mounting hole; 222. Connecting rod; 223. Second slide groove. DETAILED DESCRIPTION

[0025] The drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate the embodiments, some components in the drawings may be omitted, enlarged, or reduced in size, and do not represent actual product dimensions. Those skilled in the art will understand that some well-known structures and their descriptions may be omitted from the drawings. The positional relationships depicted in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0026] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0028] Example 1

[0029] As Figure 1As shown, a PVC pipe online expansion extrusion device includes an extrusion assembly 1, an expansion assembly 22, and a drive member 3. The extrusion assembly 1 is internally provided with an extrusion channel 4 having a discharge port 5. The expansion assembly 2 includes a telescopic bracket assembly 21 and a connecting shaft 22. One end of the connecting shaft 22 is located within the extrusion channel 4, and the other end of the connecting shaft 22 extends out of the discharge port 5 and is slidably connected to the telescopic bracket assembly 21. The connecting shaft 22 is hollow and is provided with a connecting rod 222. One end of the connecting rod 222 is threadedly connected to the telescopic bracket assembly 21. The drive member is connected to the connecting rod 222 at one end of the extrusion channel to drive the connecting rod 222 to rotate and drive the telescopic bracket assembly 21 in its radial direction. The extrusion assembly 1 is used to produce PVC-U pipe. An extrusion channel 4 is provided within the extrusion assembly 1. During production, molten raw materials are fed into the feed port of the extrusion assembly 1. As the raw materials move through the extrusion channel 4, they gradually cool and solidify, ultimately producing a PVC-U pipe with a fixed shape from the discharge port 5 of the extrusion assembly 1. Raw materials are continuously fed into the feed port of the extrusion assembly 1, and excess raw materials continuously extrude the already formed PVC-U pipe from the extrusion assembly 1, thereby achieving continuous production of PVC-U pipes. Although the PVC-U pipes produced from the discharge port 5 of the extrusion assembly 1 have already solidified into shape, they still have a certain temperature that makes them easy to stretch, eliminating the need for secondary preheating of the PVC-U pipes. The discharge port 5 of the extrusion assembly 1 is provided with an expansion assembly 2, which includes a telescopic assembly 21 and a connecting shaft 22. One end of the connecting shaft 22 is fixed to the discharge port 5 of the extrusion assembly 1, guiding the PVC-U pipe. The diameter of the connecting shaft 22 is smaller than the inner diameter of the PVC-U pipe, allowing the PVC-U pipe extruded from the discharge port 5 of the extrusion assembly 1 to be extruded unimpeded while restricting the PVC-U pipe to axial movement along the connecting shaft 22. The other end of the connecting shaft 22 is provided with a telescopic assembly 21. The telescopic assembly 21 can be made of a solid material that is not easily deformed, allowing it to withstand large pressure without deformation, ensuring that the PVC-U pipe produced after being stretched by the telescopic assembly 21 meets the requirements. The telescopic cage structure has a variable diameter. Before the PVC-U pipe reaches the telescopic cage assembly 21, the assembly is in a contracted state, with its diameter equal to or smaller than the inner diameter of the PVC-U pipe, allowing it to smoothly enter the pipe. Once the PVC-U pipe discharge stabilizes, the end of the PVC-U pipe that has exited the telescopic cage assembly 21 is introduced into a tractor. The telescopic cage assembly 21 then expands, from a small diameter to a large diameter, radially stretching the PVC-U pipe.At the same time, the change in the diameter of the telescopic assembly 21 causes a change in the friction between the telescopic assembly 21 and the inner wall of the PVC-U pipe, resulting in a speed difference between different parts of the PVC-U pipe, thereby exerting an axial stretching effect on the PVC-U pipe, ultimately stretching the PVC-U pipe into a PVC-O pipe. A drive member 3 is also provided for driving the telescopic assembly 21. A connecting rod 222 is provided in the connecting shaft 22. One end of the connecting rod 222 is threadedly connected to the telescopic assembly 21. The drive member 3 is connected to the connecting rod 222 at one end of the extrusion channel 4. The drive member 3 drives the connecting rod 222 to rotate, thereby driving the telescopic assembly 21 in its radial direction.

[0030] like Figure 1 As shown, the telescopic Ke assembly 21 includes a Ke core 211, a large Ke mold 212 and a small Ke mold 213. The Ke core 211 is threadedly connected to the connecting rod 222. The large Ke mold 212 and the small Ke mold 213 are respectively connected to the connecting shaft 222 for sliding connection along its radial direction. The large Ke mold 212 and the small Ke mold 213 are arranged on the circumference of the Ke core 211 in sequence. The large Ke mold 212 and the small Ke mold 213 are connected to the Ke core 211 for sliding connection along the length direction of the Ke core 211. When the small Ke mold 213 is located on the inner side of the large Ke mold 212, the large Ke molds 212 enclose a first circumferential surface; when the connecting rod 222 drives the Ke core 211 to move linearly, the Ke core 211 drives the small Ke mold 213 to insert between two adjacent large Ke molds 212, and the large Ke molds 212 and the small Ke molds 213 jointly enclose a second circumferential surface. When the telescopic assembly 21 is in the contracted state, the large molds 212 abut against each other, and the outer circumference of the telescopic assembly 212 is entirely composed of the large molds 212, forming a first circumference with a smaller diameter. An accommodating space is formed between each large mold 212, and the small mold 213 is accommodated in the accommodating space. When the telescopic mold needs to be extended, it is only necessary to drive the connecting rod 222 to rotate. Since the connecting rod 222 is threadedly connected to the core 211, the third rotation of the connecting rod 222 will push the core 211 to move along the axial direction of the connecting rod 22, so that the core 211 originally located outside each small mold 213 is inserted between each small mold 213, so that the space between each small mold 213 is occupied by the core 213. Each small mold 213 moves toward the outside of the accommodating space under the push of the core, so that the small mold 213 is inserted between the two adjacent large molds 212 and pushes the large mold 212 to move outward. Finally, the outer peripheral surface of the small mold 213 is flush with the outer peripheral surface of the large mold 212, forming a second peripheral surface, so that the telescopic mold assembly 21 has an outer peripheral surface with a larger diameter, realizing bidirectional stretching of the PVC-U pipe.

[0031] like Figure 4As shown, the core 211 is a tapered polyhedron structure. The core 211 is provided with multiple first side surfaces 214, with a second side surface 215 disposed between adjacent first side surfaces 214. The large mold 212 is slidably connected to the first side surfaces 214, and the small mold 213 is slidably connected to the second side surfaces 215. The core 211 is configured as a tapered polyhedron structure, wherein the end of the core 211 facing the small molds 213 and large mold 212 is narrowed, making it easier to insert between the small molds 213. The core 211 abuts the large mold 212 and the small mold 212 via the first side surface 214 and the second side surface 215, respectively. Both the first side surface 214 and the second side surface 215 are inclined surfaces that slope outward from the end of the core 211 facing the small mold 213 and large mold 212. The movable direction of the core 211 is along the axial direction of the telescopic core assembly 21, while the moving direction of the small core mold 213 and the large core mold 212 is along the radial direction of the telescopic core assembly 21. When the core 211 moves, the first side surface 214 and the second side surface 215 respectively abut against the large core mold 212 and the small core mold 214. The first side surface 214 and the second side surface 215 apply a supporting force perpendicular to the surface to the large core mold 212 and the small core mold 214. Since the first side surface 214 and the second side surface 215 are both inclined surfaces, the supporting force perpendicular to the surface has a component force in the radial direction of the telescopic core assembly 21. This component force can push the large core mold 212 and the small core mold 214 to move, thereby changing the diameter of the telescopic core assembly 21.

[0032] like Figure 4 As shown, the first side surface 214 forms a first inclination angle with the central axis of the core 211, and the second side surface 213 forms a second inclination angle with the central axis of the core 211, with the second inclination angle 211 being twice the first inclination angle. During the extension of the telescopic core structure 21, the small core mold 213 needs to move from the inside of the large core mold 212 to be flush with the outer circumference of the large core mold 212. Therefore, the small core mold 212 moves a greater distance than the large core mold 212, and the movement speed of the small core mold 213 should be higher than that of the large core mold 212. The movement of the large core mold 212 and the small core mold 213 is driven by the core 211. The movement speed of the large core mold 212 and the small core mold 213 is related to the slope of the core 211 surface with which they abut. Therefore, the second inclination angle of the second side surface 215 abutting the small core mold 215 is twice the first inclination angle of the first side surface 214, so that the movement of the small core mold 213 and the large core mold 212 can match each other.

[0033] Example 2

[0034] This embodiment is similar to the above embodiment 1, except that Figure 4 、 5As shown, a first chute 23 / first slide rail 24 is provided on the first side 214 and the second side 215, respectively. A second slider 25 / second chute is provided on the side of each large and small mold 212 and 213 near the core 211. The second slider 25 / second chute is slidably connected to the corresponding first chute 23 / first slide rail 24. The provision of the first chute 23 / first slide rail 24 and the second slider 25 / second chute restricts the movement of the large and small molds 212 and 213, ensuring coordination and preventing malfunctions. At the same time, the first slide groove 23 / first slide rail 24 and the second slider 25 / second slide groove can also limit the relative positions of the large Ke mold 212 and the small Ke mold 213 and the Ke core 211, so that the large Ke mold 212 and the small Ke mold 213 remain in contact with the first side surface 214 and the second side surface 215. When the Ke core 21 moves away from the large Ke mold 212 and the small Ke mold 213, the large Ke mold 212 and the small Ke mold 213 can shrink accordingly under the restriction of the slide groove and the slide rail.

[0035] like Figure 5 、 6 As shown, a radial third slot 223 is provided at one end of the connecting shaft 22 near the core 211. A third slider 217 is provided at one end of each of the large and small core molds 212 and 213 near the connecting shaft 22. The third slot 223 is slidably connected to the third slider 217. The third slider 217 and the third slot 223 are used to limit the radial movement of the large and small core molds 212 and 213 along the telescopic core assembly 21.

[0036] like Figure 4 As shown, a first threaded hole 216 is provided at one end of the core 211 near the connecting shaft 22. A mounting hole 221 is provided in the center of the connecting shaft 22. A connecting rod 222 is rotatably mounted in the mounting hole 221. One end of the connecting rod 222 is connected to the first threaded hole 216, and the other end of the connecting rod 222 is connected to the driving member 3. By providing the first threaded hole 216 in the core 211 and threading the first threaded hole 216 together, the power of the connecting rod 222 can be transmitted to the core 211. At the same time, the rotational motion of the connecting rod 222 can be converted into linear motion of the core 211 along the axis of the connecting rod 222. The direction of motion of the core 221 can be changed by changing the rotational direction of the connecting rod 222. The other end of the connecting rod 222 is connected to the driving member 3, which drives the connecting rod 222 to rotate.

[0037] Example 3

[0038] This embodiment is similar to the above embodiment 1, except that Figure 2As shown, the extrusion assembly 1 includes a mold body 11, a mold cavity is provided in the mold body 11, a diverter cone 12 is provided in the mold cavity, the diverter cone 12 includes an outer ring 121, an inner ring 122 and a cone 123, the outer ring 121 is fixed on the mold body 11, the inner ring 122 is provided on the inner side of the outer ring 121, the outer ring 121 and the inner ring 122 are coaxial, a support plate 124 is provided between the outer ring 121 and the inner ring 122, the two ends of the support plate 124 are respectively connected to the inner wall surface of the outer ring 121 and the outer wall surface of the inner ring 122, an extrusion channel 5 is formed between the outer ring 121, the inner ring 122 and the support plate 124, the cone 123 is fixed on the end face of the inner ring 122 at one end close to the feed port of the mold body 11, and the connecting shaft 22 is fixed on the end face of the inner ring 122 at one end close to the discharge port 6. The mold body 11 is used to determine the external shape of the product. The mold body 11 is provided with a mold cavity, and the mold cavity is provided with a diverter cone 12. The diverter cone 12 can evenly disperse the raw materials in all directions and withstand the impact of the raw materials flowing through. The diverter cone 12 includes an outer ring 121, an inner ring 122, and a cone 123. The outer ring 121 is fixed to the mold body 11, and the inner ring 122 is set inside the outer ring 121. The outer ring 121 and the inner ring 122 are coaxial. A support plate 124 is provided between the outer ring 121 and the inner ring 122. The support plate 124 is used to fix the relative position of the outer ring 121 and the inner ring 122. The cone 123 is used to disperse the originally concentrated raw materials to avoid uneven distribution of the raw materials in all directions.

[0039] like Figure 2 As shown, the driver 3 is mounted on the outer wall of the mold body 1. The diverter cone 12 is provided with a connecting hole 125 extending from the outer wall of the outer ring 121 through the support plate 124 to the inner wall of the inner ring 122. The inner core 13 is also provided with a second mounting hole 131 extending therethrough. A connecting rod 222 is rotatably mounted within the second mounting hole 131. The driving end of the driver 3 is connected to a transmission member, which extends from the connecting hole 125 into the inner wall of the inner ring 122 and is in transmission connection with the connecting rod 222. The driver 3 drives the telescopic assembly 21 by rotating the connecting rod 222. The driver 3 is arranged on the outer wall of the mold body 1 so that it does not affect the flow of the raw material within the mold body 11. The driving end of the driver 3 is provided with a transmission member that is in transmission connection with the connecting rod 222, transmitting the power of the driver 3 to the connecting rod 222. The diverter cone 12 is provided with a connecting hole 125 extending from the outer wall of the outer ring 121 through the support plate 123 to the inner wall of the inner ring 122 , providing a passage for the transmission member to pass through.

[0040] like Figure 2As described above, the driving end of the driver 3 is provided with a first sprocket 14, and the end of the connecting rod 222 near the inner ring 122 is provided with a second sprocket 15. The transmission member is a transmission chain 13, which is wound around the first sprocket 14 and then around the second sprocket 15 through the connecting hole 125. The interaction between the first sprocket 14, the second sprocket 15, and the transmission chain 13 facilitates the precise transmission of torque between the driver 3 and the connecting rod 222, thereby precisely controlling the displacement of the core 211.

[0041] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. A person skilled in the art will be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A PVC pipe online expansion extrusion device, characterized in that: The invention comprises an extrusion component (1), an expansion component (2) and a driving member (3), wherein an extrusion channel (4) is provided inside the extrusion component (1), and the extrusion channel (4) has a discharge port (5); the expansion component (2) comprises a telescopic component (21) and a connecting shaft (22), one end of the connecting shaft (22) is located in the extrusion channel (4), and the other end of the connecting shaft (22) extends out of the discharge port (5) and is slidably connected to the telescopic component (21); the connecting shaft (22) is hollow inside, and a connecting rod (222) is provided in the connecting shaft (22), one end of the connecting rod (222) is threadedly connected to the telescopic component (21); the driving member is connected to one end of the connecting rod (222) located in the extrusion channel to drive the connecting rod (222) to rotate and drive the telescopic component (21) to move along its radial direction.

2. A PVC online expansion extrusion device according to claim 1, characterized in that: The telescopic Ke assembly (21) includes a Ke core (211), a large Ke mold (212) and a small Ke mold (213), the Ke core (211) is threadedly connected to the connecting rod (222), the large Ke mold (212) and the small Ke mold (213) are respectively connected to the connecting shaft (222) in a radially sliding manner, the large Ke mold (212) and the small Ke mold (213) are sequentially arranged on the circumference of the Ke core (211), and the large Ke mold (212) and the small Ke mold (213) are connected to the Ke core (211) in a radially sliding manner. The core (211) is slidably connected along the length direction of the core (211); when the small mold (213) is located inside the large mold (212), the large molds (212) are enclosed to form a first circumferential surface; when the connecting rod (222) drives the core (211) to move linearly, the core (211) drives the small mold (213) to be inserted between two adjacent large molds (212), and the large molds (212) and the small molds (213) are enclosed together to form a second circumferential surface.

3. A PVC online expansion extrusion device according to claim 2, characterized in that: The core (211) is a conical polyhedron structure. A plurality of first side surfaces (214) are provided on the core (211). A second side surface (215) is provided between two adjacent first side surfaces (214). The large core mold (212) is slidably connected to the first side surfaces (214), and the small core mold (213) is slidably connected to the second side surfaces (215).

4. A PVC online expansion extrusion device according to claim 3, characterized in that: The first side surface (214) forms a first inclination angle with the central axis of the core (211), and the second side surface (213) forms a second inclination angle with the central axis of the core (211), and the second inclination angle (211) is twice the first inclination angle.

5. A PVC online expansion extrusion device according to claim 3, characterized in that: A first slide groove (23) / a first slide rail (24) is respectively provided on the first side surface (214) and the second side surface (215), and a second slider (25) / a second slide groove is respectively provided on a side of each of the large Ke mold (212) and the small Ke mold (213) close to the Ke core (211), and the second slider (25) / the second slide groove is slidably connected to its corresponding first slide groove (23) / the first slide rail (24).

6. A PVC online expansion extrusion device according to claim 2, characterized in that: A radial third sliding groove (223) is provided at one end of the connecting shaft (22) close to the core (211), and a third sliding block (217) is provided at one end of each of the large core mold (212) and the small core mold (213) close to the connecting shaft (22), and the third sliding groove (223) is slidably connected to the third sliding block (217).

7. A PVC online expansion extrusion device according to claim 2, characterized in that: A first threaded hole (216) is provided at one end of the core (211) close to the connecting shaft (22), a mounting hole (221) is provided in the center of the connecting shaft (22), the connecting rod (222) is rotatably mounted in the mounting hole (221), one end of the connecting rod (222) is connected to the first threaded hole (216), and the other end of the connecting rod (222) is connected to the driving member (3).

8. The PVC online expansion extrusion device according to claim 1, characterized in that: The extrusion assembly (1) comprises a die body (11), a die cavity is provided in the die body (11), a diverter cone (12) is provided in the die cavity, the diverter cone (12) comprises an outer ring (121), an inner ring (122) and a cone (123), the outer ring (121) is fixed to the die body (11), the inner ring (122) is provided inside the outer ring (121), the outer ring (121) and the inner ring (122) are coaxial, and a support plate ( 124), the two ends of the support plate (124) are respectively connected to the inner wall surface of the outer ring (121) and the outer wall surface of the inner ring (122), the extrusion channel (5) is formed between the outer ring (121), the inner ring (122) and the support plate (124), the cone (123) is fixed on the end face of one end of the inner ring (122) close to the feed port of the mold body (11), and the connecting shaft (222) is fixed on the end face of one end of the inner ring (122) close to the discharge port (6).

9. A PVC online expansion extrusion device according to claim 8, characterized in that: The driving member (3) is mounted on the outer wall of the mold body (1); a connecting hole (125) is provided on the diverter cone (12) and extends from the outer wall of the outer ring (121) through the support plate (124) to the inner wall of the inner ring (122); a driving end of the driving member (3) is connected to a transmission member, and the transmission member extends from the connecting hole (125) into the inner wall of the inner ring (122) and is in transmission connection with the connecting rod (222).

10. A PVC in-line expansion extrusion die according to claim 9, characterized in that: A first sprocket (15) is provided at the driving end of the driving member (3), a second sprocket (16) is provided at one end of the connecting rod (222) close to the inner ring (122), and the transmission member is a transmission chain (14), which is wound around the first sprocket (15) and is wound around the second sprocket (16) through the connecting hole (125).

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