Plastic stretch forming machine

Abstract

The present invention relates to the technical field of plastic stretching and forming, and in particular to a plastic stretching and forming machine, comprising a front cover plate, the front cover plate being movably connected to a rear cover plate through a rotating shaft, a connecting flange being fixedly installed at one end of the rear cover plate away from the front cover plate, a fluid channel being penetrated and opened at the center of the front cover plate, the rear cover plate and the connecting flange, three groups of the fluid channels being interconnected, a feed port being fixedly installed at the opening at one end of the front cover plate away from the rear cover plate, and the front cover plate being connected to an extruder through the feed port, and also comprising a flow divider and a forming mechanism. The present invention can pressurize the plastic melt entering the flow divider channel and divide it into a plurality of fine streams without changing the power of the extruder, so that the plastic melt can be evenly distributed before entering the forming mechanism, thereby ensuring that the flow rate of the plastic melt at each position is relatively consistent, ensuring the uniformity of the surface thickness of the finished product, and further ensuring the production quality and production efficiency of the product.

Description

Technical Field

[0001] The invention relates to the technical field of plastic stretching and forming, in particular to a plastic stretching and forming machine. Background Art

[0002] Plastic stretch molding machine is a mechanical equipment specially used for stretching and molding plastic materials. It is widely used in the production process of plastic products. It can process plastic raw materials into products of various shapes through stretching, molding and other processes. During the working process of plastic stretch molding machine, the pre-treated plastic material needs to be extruded through an extruder. During the extrusion process, the plastic material is heated to a molten state and formed into the desired shape and size through a specific molding channel. The extruded plastic products are usually continuous profiles, such as tubes, rods, wire sheets, films, etc.

[0003] However, in the existing plastic stretching forming machine, when stretching and forming the plastic pipe, the molten plastic material is directly squeezed into the forming channel formed by the die and the core rod through the extruder. It is difficult to ensure that the plastic melt flow rate at each position remains relatively consistent when the plastic melt enters the above-mentioned forming channel, so that it is easy for the local flow rate to be too large or too small, which in turn easily leads to uneven thickness on the surface of the extruded plastic pipe, affecting the overall appearance of the product and greatly reducing the production quality of the product. In addition, the uneven plastic melt flow rate will also lead to uneven pressure distribution inside the extruder, thereby affecting the extrusion speed of the extruder, thereby reducing the production efficiency of the product and poor practicality. Summary of the invention

[0004] The purpose of the present invention is to solve the problem that when the plastic stretching molding machine in the prior art squeezes the molten plastic material into the molding channel through the extruder, the plastic melt flow rate is easily uneven, thereby reducing the production quality and production efficiency of the product, and to propose a plastic stretching molding machine.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A plastic stretch forming machine, comprising a front cover plate, the front cover plate is movably connected to a rear cover plate through a rotating shaft, a connecting flange is fixedly installed at one end of the rear cover plate away from the front cover plate, a fluid channel is opened through the center of the front cover plate, the rear cover plate and the connecting flange, three groups of the fluid channels are interconnected, a feed port is fixedly installed at the opening of one end of the front cover plate away from the rear cover plate, and the front cover plate is connected to an extruder through the feed port, and also includes:

[0007] A flow divider and a molding mechanism, wherein the flow divider is detachably mounted on the end of the connection flange away from the rear cover plate through a connecting nut, and a through hole is provided at the center of one end of the flow divider, and a flow divider mechanism is provided in the through hole, which is used to divide the plastic melt passing through the flow divider through hole into a plurality of fine streams, and the molding mechanism is provided on the flow divider and the flow divider mechanism, which is used to form the plastic melt into a specific shape and size;

[0008] The ultrasonic auxiliary mechanism is arranged on the rear cover plate and the flow diverter and is used for injecting ultrasonic waves into the flow diverter channel.

[0009] Preferably, the diversion mechanism includes a mounting block, and a plurality of groups of diversion plates are evenly installed on the outer side of the mounting block at the internal position of the through-port, and the mounting block is fixedly connected to the inner wall of the through-port through the plurality of groups of diversion plates, and the plurality of groups of diversion plates are all in a wavy grid shape, and a plurality of groups of through holes are provided on the surface of the plurality of groups of diversion plates, and the through-port is separated into a plurality of groups of flow channels by the plurality of groups of diversion plates, and a connecting component is provided on the mounting block, and the mounting block is detachably connected to the molding mechanism through the connecting component, and a preliminary diversion component is provided at one end of the mounting block close to the connecting flange for preliminary diversion of the plastic melt.

[0010] Preferably, the preliminary flow diversion assembly comprises a flow diversion block, which is fixedly mounted on one end of the mounting block facing the connecting flange, and the flow diversion block is located in the fluid channel on the connecting flange.

[0011] Preferably, the diverter block is conical in shape, and the shape of the fluid channel on the connecting flange matches the shape of the diverter block.

[0012] Preferably, the connecting assembly includes an insert rod, which is fixedly mounted at the center of one end of the mounting block away from the connecting flange, and the end of the insert rod away from the mounting block is chamfered, and the mounting block is detachably connected to the forming mechanism via the insert rod.

[0013] Preferably, the molding mechanism includes a die and a core rod, the die is fixedly mounted on the end of the diverter body away from the connecting flange, the core rod is located inside the die, and a slot corresponding to the insertion rod is opened at the end of the core rod facing the diverter block, the mounting block is plugged into the slot on the core rod through the insertion rod, the end of the core rod away from the diverter block is fixedly connected with a molding rod, the molding rod is located inside the die, and the molding channel is separated inside the die by the core rod and the molding rod.

[0014] Preferably, the core rod is arranged from thick to thin in the direction from the diverter block to the shaping rod, and a streamline groove is provided at the thicker part of the outer side of the core rod.

[0015] Preferably, a power coil is installed on the die, and the power coil is located outside the core rod, so that the plastic melt passing through the core rod can be affected by the magnetic field generated by the power coil.

[0016] Preferably, the ultrasonic auxiliary mechanism includes an ultrasonic generator and multiple groups of probes, the ultrasonic generator is fixedly installed on one end of the rear cover plate facing the diverter body, the multiple groups of probes are evenly installed on the outside of the diverter body, and the end of the multiple groups of probes close to the diverter body penetrates the outer wall of the diverter body and extends into the diverter channel.

[0017] Preferably, a porous plate is fixedly installed inside the fluid channel on the rear cover plate for filtering the plastic melt.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. The present invention can pressurize the plastic melt entering the diversion channel and divide it into many small streams without changing the power of the extruder through the mutual cooperation of the molding mechanism, the diversion mechanism and the ultrasonic auxiliary mechanism, so that the plastic melt can be evenly distributed before entering the molding mechanism, thereby ensuring that the flow rate of the plastic melt at each position is relatively consistent, avoiding the situation where the local flow rate is too large or too small, thereby ensuring the uniformity of the surface thickness of the finished product, thereby ensuring the production quality of the product, and also avoiding affecting the production efficiency of the product, and can reduce the viscosity of the plastic melt, avoid the situation where the plastic melt sticks, improve the fluidity of the plastic melt, thereby further ensuring the production quality of the product.

[0020] 2. The present invention can reduce the pressure loss of the plastic melt in the diversion process through the setting of the diversion mechanism through its reasonable channel layout and size optimization, so that the plastic melt can flow more smoothly, reduce the generation of eddy currents and turbulence, and is beneficial to maintaining the fluidity and stability of the plastic melt. At the same time, reducing the pressure loss can reduce the energy consumption of the extruder, thereby improving the product production efficiency. Moreover, through the setting of the diversion plate in the diversion mechanism, the plastic melts in different parts can intersect and mix with each other in the diversion channel. This mixing effect can make various additives, pigments and other components in the plastic melt more evenly distributed, thereby improving the quality and performance consistency of the product.

[0021] 3. The present invention cooperates with the ultrasonic auxiliary mechanism and the diversion mechanism, utilizes the multiple groups of probes of the ultrasonic auxiliary mechanism and the arrangement of the wavy grid-shaped diversion plate in the diversion mechanism, so that the cavitation bubbles formed by the cavitation effect of the ultrasonic wave can be widely and evenly distributed in the diversion channel, so that the microjets and shock waves generated when the cavitation bubbles burst can act on the plastic melt more comprehensively, and then can effectively stir and impact various parts of the plastic melt, further improving the mixing uniformity and fluidity of the plastic melt, and when the ultrasonic wave propagates in the plastic melt, it will cause the vibration of the plastic melt molecules. When the plastic melt flows through the intersection of the grid and the multi-component diversion channel, the shear stress caused by the vibration will be more obvious, which helps to break the entanglement between the plastic melt molecules and reduce the viscosity of the plastic melt, thereby further improving the fluidity of the plastic melt.

[0022] 5. The present invention can guide the plastic melt to flow along a specific path by setting the streamline groove on the surface of the core rod in the molding mechanism, thereby helping the plastic melt to better fill the molding channel and further improving the molding quality of the product. The special design of the core rod that is first thick and then thin can improve the pressure distribution and flow rate distribution of the plastic melt in the annular space. In addition, the thick and thin transition of the core rod and the layout of the streamline grooves can make the pressure and flow rate of the plastic melt in the molding channel more uniform, thereby improving the dimensional accuracy and quality stability of the product.

[0023] 6. The present invention, through the setting of the energized coil, can affect the orientation of the plastic molecular chain through the magnetic field generated by the energized coil when the plastic melt passes through the streamline groove on the surface of the core rod, thereby reducing the viscosity of the plastic melt and improving the fluidity of the plastic melt. The existence of the magnetic field may change the interaction force between plastic molecules, thereby further reducing the viscosity of the plastic melt. In addition, the heat generated after the energized coil is started can prevent the temperature of the plastic melt from dropping too much, thereby avoiding the adhesion of the plastic melt, further improving the fluidity of the plastic melt, and further ensuring the production quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a schematic diagram of the overall axial structure of a plastic stretching forming machine.

[0025] Figure 2 This is a schematic structural diagram of a front cover plate and a rear cover plate of a plastic stretch forming machine proposed by the present invention.

[0026] Figure 3 This is a schematic structural diagram of a mounting block and a diverter block of a plastic stretch forming machine proposed by the present invention.

[0027] Figure 4 This is a schematic diagram of the core rod and streamline groove structure of a plastic stretching forming machine proposed by the present invention.

[0028] Figure 5 The present invention is a schematic structural diagram of a die and an adjusting device of a plastic stretching molding machine.

[0029] Figure 6 This is a schematic diagram of the half-section structure of a plastic stretching forming machine proposed by the present invention.

[0030] In the figure: 1 front cover plate, 2 rear cover plate, 3 rotating shaft, 4 feeding port, 5 ultrasonic generator, 6 probe, 7 connecting flange, 8 flow divider, 9 connecting nut, 10 die, 11 mounting block, 12 flow divider block, 13 flow divider channel, 14 flow divider plate, 15 core rod, 16 streamline groove, 17 shaping rod, 18 energized coil, 19 forming channel, 20 porous plate, 21 fluid channel, 22 plug rod. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Reference Figures 1 to 6 A plastic stretching forming machine comprises a front cover plate 1, which is movably connected to a rear cover plate 2 through a rotating shaft 3, and a connecting flange 7 is fixedly installed at one end of the rear cover plate 2 away from the front cover plate 1, and a fluid channel 21 is opened through the center of the front cover plate 1, the rear cover plate 2 and the connecting flange 7, and the three groups of fluid channels 21 are connected to each other, and a porous plate 20 is fixedly installed inside the fluid channel 21 on the rear cover plate 2, and a feed port 4 is fixedly installed at the opening of one end of the front cover plate 1 away from the rear cover plate 2, and the front cover plate 1 is connected to the extruder through the feed port 4, and the molten plastic is extruded by the extruder. The raw materials are squeezed into the fluid channel 21. When the plastic melt passes through the porous plate 20, the solid particles in the plastic melt can be removed and the unmelted materials in the plastic melt can be filtered out. The end of the connecting flange 7 away from the rear cover plate 2 is detachably installed with a diverter 8 through a connecting nut 9. A through hole is penetrated at the center of one end of the diverter 8. A diverter mechanism is arranged in the through hole for dividing the plastic melt passing through the through hole of the diverter 8 into a plurality of small streams. A molding mechanism is arranged on the diverter 8 and the diverter mechanism for forming the plastic melt into a specific shape and size.

[0033] Reference Figure 3 , Figure 4 and Figure 6The diversion mechanism includes a mounting block 11, and a plurality of diversion plates 14 are evenly installed at the outer side of the mounting block 11 at the inner position of the through-port, and the mounting block 11 is fixedly connected to the inner wall of the through-port through the plurality of diversion plates 14, and the plurality of diversion plates 14 are all in a wavy grid shape, and a plurality of through holes are provided on the surface of the plurality of diversion plates 14, and the through-port is separated into a plurality of flow channels 13 by the plurality of diversion plates 14, and a connecting component is provided on the mounting block 11, and the mounting block 11 is detachably connected to the forming mechanism through the connecting component, and the connecting component includes a plug rod 22, and the plug rod 22 is fixedly installed at the center position of one end of the mounting block 11 away from the connecting flange 7, and the end of the plug rod 22 away from the mounting block 11 is provided with a chamfer, and the chamfer setting can reduce the friction generated when the plug rod 22 is plugged in, thereby reducing the wear of the plug rod 22 when it is plugged in, and can also make the plug rod 22 easier and more accurately inserted into the corresponding hole or slot, and the mounting block 11 is detachably connected to the forming mechanism through the plug rod 22, and the installation A preliminary diversion component is provided at one end of the block 11 close to the connecting flange 7, which is used for preliminary diversion of the plastic melt, so that the plastic melt can better enter the diversion channel 13. The preliminary diversion component includes a diversion block 12, which is fixedly mounted on the end of the mounting block 11 facing the connecting flange 7, and the diversion block 12 is located in the fluid channel 21 on the connecting flange 7. The diversion block 12 is conical, and the shape of the fluid channel 21 on the connecting flange 7 matches the shape of the diversion block 12. After the plastic melt treated by the porous plate 20 is blocked by the diversion block 12 in the fluid channel 21 on the connecting flange 7, it can enter the narrow diversion channel 13. Since the power of the extruder remains unchanged, the kinetic energy and potential energy of the liquid can be approximately regarded as unchanged. Therefore, the pressure of the liquid in the narrow diversion channel 13 will increase accordingly to ensure that the total energy remains unchanged. When the pressure in the diversion channel 13 increases, the plastic melt will be pressurized, so that the plastic melt can be more evenly distributed in the diversion channel 13.

[0034] Since the flow distribution channel 13 is separated by a plurality of wave-shaped grid-shaped flow distribution plates 14 with holes, the plastic melt entering the flow distribution channel 13 can be divided into a plurality of fine flow streams, so that the plastic melt can be evenly distributed before entering the molding mechanism, thereby ensuring that the flow rate of the plastic melt at each position is relatively consistent, avoiding the situation where the local flow rate is too large or too small, thereby ensuring the uniformity of the surface thickness of the finished product, and thus ensuring the production quality of the product. In addition, compared with the traditional simple flow distribution structure, the design of the wave-shaped grid-shaped flow distribution plate 14 can achieve a reasonable flow distribution through its reasonable flow distribution. The layout and size are optimized to reduce the pressure loss of the plastic melt during the diversion process, so that the plastic melt can flow more smoothly and reduce the generation of eddies and turbulence. Reducing the pressure loss can reduce the energy consumption of the extruder, improve the product production efficiency, and also help to maintain the fluidity and stability of the plastic melt. When the plastic melt passes through the diversion plate 14, the plastic melts in different parts intersect and mix with each other in the diversion channel 13. This mixing effect can make the various additives, pigments and other components in the plastic melt more evenly distributed, thereby improving the quality and performance consistency of the product.

[0035] Reference Figures 1 to 6 The rear cover plate 2 and the flow divider 8 are jointly provided with an ultrasonic auxiliary mechanism for injecting ultrasonic waves into the flow divider channel 13. The ultrasonic auxiliary mechanism includes an ultrasonic generator 5 and multiple sets of probes 6. The ultrasonic generator 5 is fixedly mounted on one end of the rear cover plate 2 facing the flow divider 8. The multiple sets of probes 6 are evenly mounted on the outside of the flow divider 8, and one end of the multiple sets of probes 6 close to the flow divider 8 penetrates the outer wall of the flow divider 8 and extends into the flow divider channel 13. When the plastic melt enters the flow divider channel 13, the ultrasonic generator 5 is started, and the ultrasonic waves are injected into the flow divider channel 13 through the probes 6. The existence of the wavy grid-shaped flow divider 14 can provide a spatial environment with a specific geometric shape for the cavitation effect of the ultrasonic wave. The intersections and branches of the grid will change the propagation path and energy distribution of the ultrasonic wave, so that the cavitation bubbles in the cavitation effect can be formed in a wider area. , and because the multiple groups of probes 6 are evenly distributed, the propagation of ultrasonic waves can be made more uniform. At the same time, the multi-component flow channel 13 can serve as a guiding path for the propagation of ultrasonic waves, prompting them to propagate more regularly in the plastic melt, so that the formed cavitation bubbles can be evenly distributed in the diversion channel 13, and the microjets and shock waves generated when the evenly distributed cavitation bubbles burst can act on the plastic melt more comprehensively, so that various parts of the plastic melt can be effectively stirred and impacted, further improving the mixing uniformity and fluidity of the plastic melt, and when ultrasonic waves propagate in the plastic melt, they will cause the vibration of the plastic melt molecules. When the plastic melt flows through the intersection of the grid and the multi-component flow channel 13, the shear stress caused by the vibration will be more obvious, which helps to break the entanglement between the plastic melt molecules and reduce the viscosity of the plastic melt, thereby further improving its fluidity.

[0036] Reference Figure 1 and Figures 4 to 6 The molding mechanism includes a die 10 and a core rod 15. The die 10 is fixedly mounted on the end of the diverter 8 away from the connecting flange 7. The core rod 15 is located inside the die 10, and a slot corresponding to the plug rod 22 is opened at the end of the core rod 15 facing the diverter block 12. The mounting block 11 is plugged into the slot on the core rod 15 through the plug rod 22. The end of the core rod 15 away from the diverter block 12 is fixedly connected with a shaping rod 17. The shaping rod 17 is located inside the die 10. The inside of the die 10 is separated into a molding channel 19 by the core rod 15 and the shaping rod 17. The core rod 15 is arranged from thick to thin from the diverter block 12 to the shaping rod 17, and a streamline groove 16 is opened at the thicker part of the outer side of the core rod 15. An energized coil 18 is installed on the die 10. The energized coil 18 is located on the outer side of the core rod 15. In order to make the plastic melt passing through the core rod 15 be affected by the magnetic field generated by the energized coil 18, when the plastic melt passes through the diverter channel 13 and enters the molding channel 19, it will first pass through the streamline groove 16 on the surface of the core rod 15. The setting of the streamline groove 16 on the core rod 15 can guide the plastic melt flowing out of the diverter channel 13 to flow along a specific path, thereby helping the plastic melt to better fill the molding channel 19, thereby improving the molding quality of the product. At the same time, the special design of the core rod 15 that is thick first and thin later can improve the pressure distribution and flow rate distribution of the plastic melt in the annular space, and the thick and thin transition of the core rod 15 and the layout of the streamline groove 16 can make the pressure and flow rate of the plastic melt in the molding channel 19 more uniform, thereby improving the dimensional accuracy and quality stability of the product.

[0037] In addition, when the plastic melt passes through the streamline groove 16 on the surface of the core rod 15, it will also pass through the energized coil 18. After the energized coil 18 is started, a magnetic field will be generated. The magnetic field generated by the energized coil 18 can affect the orientation of the plastic molecular chain, thereby reducing the viscosity of the plastic melt and improving its fluidity. The existence of the magnetic field may change the electrostatic interaction and van der Waals force between plastic molecules. The change in the intermolecular force will directly affect the viscosity of the plastic melt. Under the action of the magnetic field, the arrangement of the polar groups of some plastic molecules with polar groups changes, resulting in changes in the attraction or repulsion between molecules, thereby further reducing the viscosity of the plastic melt. The heat generated after the energized coil 18 is started will increase the temperature at this position, thereby ensuring that the temperature of the plastic melt flowing to this position will not drop too much, thereby avoiding the adhesion of the plastic melt, further improving the fluidity of the plastic melt, and further ensuring the production quality of the product.

[0038] In the present invention, first open the rear cover plate 2, replace the diverter plate 14, ensure that the diverter plate 14 can work normally, connect the feed port 4 to the extruder, and then start the power coil 18. At this time, the power coil 18 will generate heat to ensure the temperature in the molding channel 19.

[0039] After the preparation work is completed, the extruder squeezes the molten plastic raw material into the fluid channel 21. When passing through the porous plate 20, the solid particles in the above-mentioned plastic melt can be removed, and the unmelted materials in the plastic melt can be filtered out. After the plastic melt processed by the porous plate 20 is blocked by the diverter block 12 in the fluid channel 21 on the connecting flange 7, it can enter the narrow diverter channel 13. Since the power of the extruder remains unchanged, the kinetic energy and potential energy of the liquid can be approximately regarded as unchanged. Therefore, the pressure of the liquid in the narrow diverter channel 13 will increase accordingly to ensure that the total energy remains unchanged. When the pressure in the diverter channel 13 increases, the plastic melt will be pressurized, so that the plastic melt can be more evenly distributed in the diverter channel 13.

[0040] The shunt channel 13 is separated by a plurality of wave-shaped grid-shaped shunt plates 14 with holes. At the same time, the ultrasonic generator 5 is started to inject the ultrasonic wave into the shunt channel 13 through the probe 6. This has the following advantages:

[0041] First, the multi-component flow channel 13 formed by the wave-shaped grid-like flow divider 14 can divide the plastic melt from the extruder into many small streams. In this way, the plastic melt can be evenly distributed before entering the die 10 and the core rod 15, ensuring that the flow rate of the plastic melt at each position is relatively consistent, avoiding the situation where the local flow rate is too large or too small, thereby ensuring the uniformity of the surface thickness of the finished product.

[0042] Second, compared with the traditional simple diversion structure, the design of the wavy grid-shaped diversion plate 14 can reduce the pressure loss of the plastic melt during the diversion process through its reasonable channel layout and size optimization, which can make the plastic melt flow more smoothly and reduce the generation of eddy currents and turbulence. Reducing pressure loss can reduce the energy consumption of the extruder and improve production efficiency. It is also beneficial to maintain the fluidity and stability of the plastic melt and avoid premature adhesion of the plastic melt.

[0043] Third, when the plastic melt passes through the diverter plate 14, the plastic melts at different locations intersect and mix with each other in the diverter channel 13. This mixing effect can make various additives, pigments and other components in the plastic melt more evenly distributed, thereby improving the quality and performance consistency of the product.

[0044] Fourth, the presence of the wavy grid-shaped diverter plate 14 can provide a spatial environment with a specific geometric shape for the cavitation effect of the ultrasound. The intersections and branches of the grid will change the propagation path and energy distribution of the ultrasound, so that the cavitation bubbles in the cavitation effect can be formed in a wider area. Moreover, since the multiple groups of probes 6 are evenly distributed, the propagation of the ultrasound can be more uniform. At the same time, the multi-component diverter channel 13 can serve as a guiding path for the propagation of the ultrasound, prompting it to propagate more regularly in the plastic melt, so that the formed cavitation bubbles can be evenly distributed in the diverter channel 13, and the microjets and shock waves generated when the evenly distributed cavitation bubbles burst can act on the plastic melt more comprehensively, thereby being able to effectively stir and impact various parts of the plastic melt, further improving the mixing uniformity and fluidity of the plastic melt.

[0045] Fifth, when ultrasonic waves propagate in the plastic melt, they will cause vibration of the plastic melt molecules. When the plastic melt flows through the intersection of the grid and the multi-component flow channel 13, the shear stress caused by the vibration will be more obvious, which helps to break the entanglement between the plastic melt molecules and reduce the viscosity of the plastic melt, thereby further improving its fluidity.

[0046] When the plastic melt passes through the diversion channel 13 and enters the molding channel 19, it first passes through the flow line groove 16 on the surface of the core rod 15 which is thicker and thinner, and at the same time passes through the flow line groove 16, it also passes through the energized coil 18, which has the following advantages:

[0047] First, the streamline grooves 16 on the surface cooperate with the molten plastic flowing out of the grid-shaped diversion channel 13 to guide the plastic melt to flow along a specific path. The streamline grooves 16 can help the plastic melt to better fill the molding channel 19 and improve the molding quality of the product.

[0048] Second, the special design of the core rod 15 can improve the pressure distribution and flow rate distribution of the plastic melt in the annular space. The thick and thin transition of the core rod 15 and the layout of the streamline groove 16 can make the pressure and flow rate of the plastic melt in the molding channel 19 more uniform, thereby improving the dimensional accuracy and quality stability of the product.

[0049] Third, the energized coil 18 will generate a magnetic field, which can affect the orientation of the plastic molecular chains, thereby reducing the viscosity of the plastic melt and improving its fluidity.

[0050] Fourth, the existence of a magnetic field may change the electrostatic interaction and van der Waals force between plastic molecules. The change in the intermolecular force will directly affect the viscosity of the plastic melt. Under the action of the magnetic field, the arrangement of the polar groups of some plastic molecules with polar groups changes, resulting in changes in the attraction or repulsion between molecules, thereby reducing the viscosity of the plastic melt.

[0051] Fifth, the heat generated after the energized coil 18 is started will increase the temperature at this position, thereby ensuring that the temperature of the plastic melt flowing to this position will not drop too much, thereby avoiding the adhesion of the plastic melt and further improving the fluidity of the plastic melt.

[0052] Finally, the plastic melt enters the molding channel 19, forms a soft pipe with the assistance of the shaping rod 17, and is extruded from the front end of the die 10. The extruded hose enters the cooling device through an external traction device, and is finally cooled and formed for cutting.

[0053] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plastic stretch forming machine, comprising a front cover plate (1), wherein the front cover plate (1) is movably connected to a rear cover plate (2) via a rotating shaft (3), a connecting flange (7) is fixedly mounted on one end of the rear cover plate (2) away from the front cover plate (1), a fluid channel (21) is penetrated at the center of the front cover plate (1), the rear cover plate (2) and the connecting flange (7), three groups of the fluid channels (21) are interconnected, a feed port (4) is fixedly mounted at the opening of one end of the front cover plate (1) away from the rear cover plate (2), and the front cover plate (1) is connected to an extruder via the feed port (4), characterized in that: Also includes: a flow divider (8) and a molding mechanism, wherein the flow divider (8) is detachably mounted on an end of the connecting flange (7) away from the rear cover plate (2) via a connecting nut (9), and a through hole is provided at the center of one end of the flow divider (8), and a flow divider mechanism is provided in the through hole for dividing the plastic melt passing through the through hole of the flow divider (8) into a plurality of fine streams, and the molding mechanism is provided on the flow divider (8) and the flow divider mechanism for forming the plastic melt into a specific shape and size; An ultrasonic auxiliary mechanism, the ultrasonic auxiliary mechanism being arranged on the rear cover plate (2) and the flow diverter (8) and being used for injecting ultrasonic waves into the flow diverter channel (13); The diversion mechanism comprises a mounting block (11), a plurality of diversion plates (14) are evenly mounted on the outside of the mounting block (11) at positions inside the through-port, and the mounting block (11) is fixedly connected to the inner wall of the through-port via the plurality of diversion plates (14), the plurality of diversion plates (14) are all in a wavy grid shape, and the surfaces of the plurality of diversion plates (14) are all provided with a plurality of through holes, the through-port is divided into a plurality of flow channels (13) by the plurality of diversion plates (14), a connection component is arranged on the mounting block (11), and the mounting block (11) is detachably connected to the molding mechanism via the connection component, and a preliminary diversion component is arranged at one end of the mounting block (11) close to the connecting flange (7) for preliminary diversion of the plastic melt; The preliminary flow splitting assembly comprises a flow splitting block (12), wherein the flow splitting block (12) is fixedly mounted on one end of the mounting block (11) facing the connecting flange (7), and the flow splitting block (12) is located in a fluid channel (21) on the connecting flange (7); The connecting assembly comprises an insert rod (22), the insert rod (22) being fixedly mounted at a central position of an end of the mounting block (11) away from the connecting flange (7), and a chamfer is provided at the end of the insert rod (22) away from the mounting block (11), and the mounting block (11) is detachably connected to the forming mechanism via the insert rod (22); The molding mechanism comprises a die (10) and a core rod (15); the die (10) is fixedly mounted on an end of the flow divider (8) away from the connecting flange (7); the core rod (15) is located inside the die (10); and a slot corresponding to the insertion rod (22) is provided at one end of the core rod (15) facing the flow divider block (12); the mounting block (11) is plugged into the slot on the core rod (15) via the insertion rod (22); an end of the core rod (15) away from the flow divider block (12) is fixedly connected to a shaping rod (17); the shaping rod (17) is located inside the die (10); and a molding channel (19) is separated inside the die (10) by the core rod (15) and the shaping rod (17).

2. A plastic stretching machine according to claim 1, characterized in that: The diverter block (12) is conical in shape, and the shape of the fluid channel (21) on the connecting flange (7) matches the shape of the diverter block (12).

3. A plastic stretching machine according to claim 1, characterized in that: The core rod (15) is arranged from thick to thin in a direction from the diverter block (12) to the shaping rod (17), and a flow line groove (16) is provided at the thicker portion of the outer side of the core rod (15).

4. A plastic stretching machine according to claim 1, characterized in that: An energized coil (18) is mounted on the die (10), and the energized coil (18) is located outside the core rod (15) and is used to allow the plastic melt passing through the core rod (15) to be affected by the magnetic field generated by the energized coil (18).

5. A plastic stretching machine according to claim 1, characterized in that: The ultrasonic auxiliary mechanism comprises an ultrasonic generator (5) and a plurality of probes (6), wherein the ultrasonic generator (5) is fixedly mounted on one end of the rear cover plate (2) facing the flow divider (8), the plurality of probes (6) are evenly mounted on the outside of the flow divider (8), and the ends of the plurality of probes (6) close to the flow divider (8) penetrate the outer wall of the flow divider (8) and extend into the flow divider channel (13).

6. A plastic stretching machine according to claim 1, characterized in that: A porous plate (20) is fixedly installed inside the fluid channel (21) on the rear cover plate (2) for filtering the plastic melt.

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