Double-cavity hose forming equipment with fixed-point cutting function

Abstract

The invention discloses double-cavity hose forming equipment with a fixed-point cutting function, and relates to the technical field of extrusion molding.The double-cavity hose forming equipment comprises an extruder, a shaping mechanism, a cooling device, a traction device and a cutting machine, the shaping mechanism is connected with the extruder in a fastened mode and located at a discharging port of the extruder, and the cooling device is located at a discharging port of the extruder; the cooling device, the traction device and the cutting machine are sequentially arranged in the conveying direction of the hose, firstly, raw materials are added into the extruder, plastic materials enter the extruder from the hopper and are heated to be molten, and under the action of pressure, the materials in the molten state pass through the shaping mechanism with a certain shape to be shaped. The cross section of the continuous body is similar to that of an outlet of the shaping mechanism, then the continuous body is cooled through the cooling device, the traction device is used for driving the formed double-cavity hose to be input into the cutting machine at a certain speed, finally, the cutting machine conducts fixed-point cutting on the double-cavity hose, and a final finished product is obtained.

Description

Technical Field

[0001] The invention relates to the technical field of extrusion molding, in particular to a double-cavity hose molding device with a fixed-point cutting function. Background Art

[0002] Extrusion molding, also known as extrusion molding or extrusion molding, mainly refers to a molding method that uses the extrusion effect of a screw or plunger to force the hot molten polymer material through the die head under pressure to form a continuous profile with a constant cross-section. The extrusion molding process mainly includes feeding, melt plasticization, extrusion molding, shaping and cooling.

[0003] The extrusion process can be divided into two stages: the first stage is to plasticize the solid plastic (that is, turn it into a viscous fluid) and pass it through a specially shaped die under pressure to become a continuum with a cross-section similar to the shape of the die; the second stage is to use appropriate methods to make the extruded continuum lose its plastic state and turn it into a solid to obtain the desired product.

[0004] Since plastic extrusion is a continuous process, the extruded parts have low strength when they are just extruded, and the double-chamber hose has a hollow part. The hollow part cannot provide support and will inevitably deform, which will cause the final shape of the finished product to deform and the production quality cannot be guaranteed. Summary of the invention

[0005] The object of the present invention is to provide a double-cavity hose forming device with a fixed-point cutting function to solve the problems raised in the prior art.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: The present invention provides a technical solution of a double-cavity hose forming equipment with a fixed-point cutting function, the double-cavity hose forming equipment includes an extruder, a shaping mechanism, a cooling device, a traction device and a cutter, the shaping mechanism is tightly connected to the extruder, the shaping mechanism is located at the discharge port of the extruder, the cooling device, the traction device and the cutter are arranged in sequence along the conveying direction of the hose, the cooling device is used to cool the formed hose, the traction device is used to drive the hose to move, and the cutter is used to perform fixed-point cutting on the hose.

[0007] The present invention is used to produce a hose with a double-cavity structure. First, raw materials are added to an extruder. Plastic materials enter the extruder from a hopper and are transported forward under the rotation of a screw. During the forward movement of the materials, the materials are heated to melt the materials. Under the action of pressure, the materials in a molten state pass through a shaping mechanism with a certain shape to become a continuum with a cross section similar to that of the shaping mechanism outlet. Then, the materials are cooled by a cooling device. A traction device is used to drive the formed double-cavity hose to be input into a cutting machine at a certain speed. Finally, the cutting machine cuts the double-cavity hose at a fixed point to obtain a final product.

[0008] Furthermore, the shaping mechanism includes a fixed flange, a guide pipe, a die head assembly and an air inlet pipe. The discharge port of the extruder is provided with a connecting flange. The fixed flange is tightly connected to the connecting flange. The guide pipe is tightly connected to the fixed flange. The guide pipe is communicated with the discharge port of the extruder. The die head assembly is tightly connected to the guide pipe. The air inlet pipe is communicated with the die head assembly. The air inlet pipe is connected to an external air source. An adjusting component is provided on the air inlet pipe. The adjusting component is used to adjust the air intake volume.

[0009] The fixed flange on the shaping mechanism is fixed to the connecting flange of the extruder by bolts, so as to guide the molten plastic fluid squeezed out by the extruder into the guide tube. The molten plastic fluid passes through the die assembly to form a continuum with a cross-section similar to that of the die assembly outlet. However, because the extrusion is at a high temperature and relatively soft when it is just extruded, and the strength is low, and the double-lumen hose has a hollow part, the hollow part cannot provide support and deformation is inevitable. The compressed air is guided to the die assembly through the air inlet pipe, and the compressed air is used to provide non-contact support to the hollow part of the extrusion, and plays a corresponding cooling and shaping role, so that the double-lumen hose just extruded hardens quickly. The higher the temperature of the extrusion and the softer it is, the need to improve the cooling efficiency. The air intake of the air inlet pipe is adjusted by the adjusting component. The higher the temperature, the greater the air intake, that is, the cooling efficiency is automatically adjusted according to the temperature of the extrusion.

[0010] Furthermore, the die head assembly includes a fixed frame, a guide block and a guide ring. The fixed frame is tightly connected to the inner wall of the guide tube, the guide block is tightly connected to the fixed frame, the guide ring is tightly connected to the guide tube, the guide ring is sleeved on the outside of the guide block, two guide blocks are provided, and an extrusion channel is provided between the two guide blocks and the guide ring. The cross-section of the extrusion channel is the same as the cross-section of the double-cavity hose.

[0011] The fixing frame is fixed on the guide tube to provide support for the guide block. The guide block and the guide ring are used to guide the molten plastic. After being guided by the guide block, the molten plastic fluid flows into the extrusion flow channel between the two guide blocks and the guide ring, forming a continuum with a cross-section similar to that of the extrusion flow channel outlet, thereby realizing the continuous molding of the double-cavity hose.

[0012] Furthermore, the guide block is provided with an inclined surface, a step surface, an inlet flow channel and an outlet flow channel. The inclined surface plays a guiding role. The inlet flow channel is connected with the inlet pipe, and the outlet flow channel is connected with the inlet flow channel. The outlet of the outlet flow channel is evenly distributed on the step surface.

[0013] The inclined surface is used to guide the molten plastic so that the plastic fluid flows into the extrusion flow channel between the two guide blocks and the guide ring. The compressed gas introduced through the air inlet pipe flows into the inlet flow channel and then flows out from the outlet on the step surface through the outlet flow channel, i.e., an airflow barrier is formed around the step surface. The airflow is used to support the circumference of the extrusion flowing out of the extrusion flow channel, i.e., contactless support for the extrusion is achieved, so that the soft extrusion just extruded is supported, which plays a role in preventing deformation, and reduces the friction between the extrusion and the guide block, thereby improving the smoothness of the extrusion outflow. In addition, the flowing airflow can also take away the heat of the extrusion, pre-cool and harden the extrusion, prevent the extrusion from entering the cooling device at a higher temperature, reduce the temperature difference between the extrusion and the cooling device, and avoid the occurrence of cold cracks.

[0014] Furthermore, the regulating component includes a heat conducting plate, a first piston, an airbag, an iron core, a coil, a repulsive magnet and a second piston. The heat conducting plate is tightly connected to the air intake pipe, and the arrangement direction of the heat conducting plate is parallel to the moving direction of the material. An active cavity and a guide hole are provided in the heat conducting plate. The first piston is slidably connected to the active cavity, one end of the airbag abuts against the inner wall of the active cavity, and the other end of the airbag abuts against the first piston. The iron core is tightly connected to the first piston, and the iron core is slidably connected to the guide hole. The coil is wound around the outside of the guide hole, the coil is connected to an external power supply, and the iron core is inserted into the coil to form an electromagnet. A first chamber and a second chamber are provided on the air intake pipe, and the second piston is slidably connected to the first chamber. The repulsive magnet is tightly connected to the second piston, and the repulsive magnet and the iron core are arranged opposite to each other, and the facing ends of the repulsive magnet and the electromagnet are poles of the same name.

[0015] The regulating component is located on the intake pipe in a position inside the guide pipe. The molten plastic fluid can pass through the regulating component. The heat conducting plate parallel to the moving direction of the material can reduce the resistance to the plastic fluid and can directly contact the molten plastic, that is, it can quickly sense the temperature change of the molten plastic. When the temperature of the molten plastic rises, the airbag expands due to the heat, driving the first piston to move upward along the active cavity, which also drives the iron core to move upward along the guide hole, that is, the distance the iron core is inserted into the coil is increased, so that the magnetic force of the electromagnet composed of the iron core and the coil is increased, and the opposing ends of the repelling magnet and the electromagnet are the same magnetic poles. According to the principle of like poles repelling each other, the repelling magnet will be subjected to an upward magnetic force, thereby driving the second piston to move upward along the first chamber; that is, the higher the temperature of the molten plastic, the longer the distance the second piston moves along the first chamber.

[0016] Furthermore, a movable component is provided in the intake pipe, and the movable component includes a movable plate and a support spring. The movable plate is slidably connected to the second chamber, one end of the support spring is fastened to the inner wall of the second chamber, and the other end of the support spring is fastened to the movable plate. The movable plate is arranged at an angle, and the first chamber is connected to the second chamber, and hydraulic oil is filled in the first chamber and the second chamber.

[0017] The discharge temperature of the extruder fluctuates to a certain extent, which will cause the temperature of the extruded parts to be high and low. If the same air intake is used to cool the extruded parts, the heat dissipation effect cannot be guaranteed; the movable component can adjust the flow cross-section of the intake pipe to adjust the amount of air intake, because the higher the temperature of the molten plastic, the longer the distance the second piston moves along the first chamber. Under the transmission action of the hydraulic oil in the first chamber and the second chamber, the movable plate will be driven to move along the second chamber toward the support spring. The support spring is compressed, and the length of the movable plate extending out of the second chamber is shortened, which increases the flow cross-section of the intake pipe and increases the air intake. That is, the higher the temperature of the molten plastic, the greater the air intake of the intake pipe; that is, the air intake of the intake pipe is automatically adjusted according to the temperature of the molten plastic, that is, the heat dissipation efficiency of the extruded parts is automatically adjusted according to the temperature of the molten plastic.

[0018] Furthermore, the cross-sectional area of ​​the first chamber is greater than the cross-sectional area of ​​the second chamber.

[0019] Because the fluctuation range of the discharge temperature of the extruder is small, the distance moved by the first piston driven by the airbag is shorter, and the distance moved by the second piston under the linkage of the first piston is also shorter. According to Pascal's principle, by setting the cross-sectional area of ​​the first chamber to be larger than that of the second chamber, the displacement of the second piston is correspondingly amplified, thereby increasing the moving range of the movable plate and thus improving the regulating effect of the air intake volume.

[0020] Furthermore, the cooling device is provided with a cooling water tank, and cooling water is filled in the cooling water tank.

[0021] The double-lumen hose processed by the shaping mechanism still has a certain amount of heat, which is cooled by the cooling water in the cooling water tank to facilitate subsequent cutting.

[0022] Compared with the prior art, the present invention has the following beneficial effects: 1. After the compressed gas introduced through the intake pipe flows into the intake channel, it will flow out from the outlet on the step surface through the outlet channel, that is, an airflow barrier is formed around the step surface, and the airflow is used to support the circumference of the extrusion flowing out of the extrusion channel, that is, non-contact support for the extrusion is achieved, so that the soft extrusion just extruded is supported, which plays a role in preventing deformation, and reduces the friction between the extrusion and the guide block, thereby improving the smoothness of the extrusion outflow. In addition, the flowing airflow can also take away the heat of the extrusion, pre-cool and harden the extrusion, prevent the extrusion from entering the cooling device at a higher temperature, reduce the temperature difference between the extrusion and the cooling device, and avoid the occurrence of cold cracks.

[0023] 2. The movable component can adjust the flow cross-section of the intake pipe to adjust the amount of air intake, because the higher the temperature of the molten plastic, the longer the distance the second piston moves along the first chamber. Under the transmission action of the hydraulic oil in the first chamber and the second chamber, the movable plate will be driven to move along the second chamber toward the direction of the support spring. The support spring is compressed and the length of the movable plate extending out of the second chamber is shortened, which increases the flow cross-section of the intake pipe and increases the air intake. That is, the higher the temperature of the molten plastic, the greater the air intake of the intake pipe; that is, the air intake of the intake pipe is automatically adjusted according to the temperature of the molten plastic, that is, the heat dissipation efficiency of the extruded component is automatically adjusted according to the temperature of the molten plastic. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the shaping mechanism of the present invention; Figure 3 It is a partial cross-sectional view of the shaping mechanism of the present invention; Figure 4 is a cross-sectional view of the flow guide tube of the present invention; Figure 5 It is a schematic diagram of the die assembly of the present invention; Figure 6 It is a schematic diagram of the adjustment component of the present invention; Figure 7 for Figure 6 A local enlarged view of point A; Figure 8 It is a schematic diagram of the structure of a double-lumen hose.

[0025] In the figure: 1-extruder, 11-connecting flange, 2-forming mechanism, 21-fixed flange, 22-guide pipe, 23-die head assembly, 231-fixed frame, 232-guide block, 2321-inclined surface, 2322-step surface, 2323-inlet flow channel, 2324-outlet flow channel, 233-guide ring, 24-inlet pipe, 241-first chamber, 242-second chamber, 25-adjusting assembly, 251-heat conduction plate, 2511-active chamber, 2512-guide hole, 252-first piston, 253-air bag, 254-iron core, 255-coil, 256-repelling magnet, 257-second piston, 26-active assembly, 261-active plate, 262-support spring, 3-cooling device, 31-cooling water tank, 4-traction device, 5-cutter. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example: Figure 1-Figure 8 As shown, the present invention provides a technical solution for a double-cavity hose forming device with a fixed-point cutting function, the double-cavity hose forming device comprises an extruder 1, a shaping mechanism 2, a cooling device 3, a traction device 4 and a cutter 5, the shaping mechanism 2 is firmly connected to the extruder 1, the shaping mechanism 2 is located at the discharge port of the extruder 1, the cooling device 3, the traction device 4 and the cutter 5 are arranged in sequence along the conveying direction of the hose, the cooling device 3 is used to cool the formed hose, the traction device 4 is used to drive the hose to move, and the cutter 5 is used to perform fixed-point cutting on the hose.

[0028] The present invention is used to produce a hose with a double-cavity structure. First, raw materials are added to an extruder 1. Plastic materials enter the extruder 1 from a hopper and are transported forward under the rotation of a screw. During the forward movement of the materials, the materials are heated to melt the materials. Under the action of pressure, the materials in a molten state pass through a shaping mechanism 2 with a certain shape to become a continuum with a cross section similar to that of the outlet of the shaping mechanism 2. Then, the materials are cooled by a cooling device 3. A traction device 4 is used to drive the formed double-cavity hose to be input into a cutting machine 5 at a certain speed. Finally, the cutting machine 5 cuts the double-cavity hose at a fixed point to obtain a final product.

[0029] The shaping mechanism 2 includes a fixed flange 21, a guide pipe 22, a die head assembly 23 and an air inlet pipe 24. The discharge port of the extruder 1 is provided with a connecting flange 11. The fixed flange 21 is tightly connected to the connecting flange 11. The guide pipe 22 is tightly connected to the fixed flange 21. The guide pipe 22 is communicated with the discharge port of the extruder 1. The die head assembly 23 is tightly connected to the guide pipe 22. The air inlet pipe 24 is communicated with the die head assembly 23. The air inlet pipe 24 is connected to an external air source. An adjusting component 25 is provided on the air inlet pipe 24. The adjusting component 25 is used to adjust the air intake amount.

[0030] The fixed flange 21 on the shaping mechanism 2 is fixed to the connecting flange 11 of the extruder 1 by bolts, so as to guide the molten plastic fluid squeezed out by the extruder 1 into the guide tube 22. The molten plastic fluid passes through the die assembly 23 to form a continuum with a cross section similar to that of the outlet of the die assembly 23. However, because the extruded piece has a high temperature, is relatively soft, and has a low strength when it is just extruded, and the double-lumen hose has a hollow part, the hollow part cannot provide support and will inevitably deform. The compressed air is guided to the die assembly 23 through the air inlet pipe 24, and the compressed air is used to provide contactless support to the hollow part of the extruded piece, and plays a corresponding cooling and shaping role, so that the double-lumen hose just extruded is quickly hardened. The higher the temperature of the extruded piece, the softer it is, and the need to improve the cooling efficiency is required. The air intake of the air inlet pipe 24 is adjusted by the adjusting assembly 25. The higher the temperature, the greater the air intake, that is, the cooling efficiency is automatically adjusted according to the temperature of the extruded piece.

[0031] The die head assembly 23 includes a fixed frame 231, a guide block 232 and a guide ring 233. The fixed frame 231 is tightly connected to the inner wall of the guide tube 22, the guide block 232 is tightly connected to the fixed frame 231, the guide ring 233 is tightly connected to the guide tube 22, and the guide ring 233 is sleeved on the outer side of the guide block 232. Two guide blocks 232 are provided, and an extrusion channel is provided between the two guide blocks 232 and the guide ring 233. The cross-section of the extrusion channel is the same as the cross-section of the double-cavity hose.

[0032] The fixing frame 231 is fixed on the guide tube 22 to provide support for the guide block 232. The guide block 232 and the guide ring 233 are used to guide the molten plastic. After being guided by the guide block 232, the molten plastic fluid flows into the extrusion channel between the two guide blocks 232 and the guide ring 233, forming a continuum with a cross-section similar to that of the extrusion channel outlet, thereby realizing the continuous molding of the double-cavity hose.

[0033] The guide block 232 is provided with an inclined surface 2321, a step surface 2322, an inlet air flow channel 2323 and an outlet air flow channel 2324. The inclined surface 2321 plays a guiding role. The inlet air flow channel 2323 is connected with the inlet pipe 24. The outlet air flow channel 2324 is connected with the inlet air flow channel 2323. The outlet of the outlet air flow channel 2324 is evenly distributed on the step surface 2322.

[0034] The inclined surface 2321 is used to guide the molten plastic so that the plastic fluid flows into the extrusion flow channel between the two guide blocks 232 and the guide ring 233. The compressed gas introduced through the air inlet pipe 24 flows into the inlet flow channel 2323 and then flows out from the outlet on the step surface 2322 through the outlet flow channel 2324, that is, an airflow barrier is formed around the step surface 2322, and the airflow is used to support the circumference of the extrusion flowing out of the extrusion flow channel, that is, contactless support for the extrusion is achieved, so that the soft extrusion that has just been extruded is supported, which plays a role in preventing deformation, and reduces the friction between the extrusion and the guide block 232, thereby improving the smoothness of the extrusion outflow. In addition, the flowing airflow can also take away the heat of the extrusion, pre-cool and harden the extrusion, prevent the extrusion from entering the cooling device 3 at a higher temperature, reduce the temperature difference between the extrusion and the cooling device 3, and avoid the occurrence of cold cracks.

[0035] The regulating assembly 25 includes a heat conducting plate 251, a first piston 252, an airbag 253, an iron core 254, a coil 255, a repelling magnet 256 and a second piston 257. The heat conducting plate 251 is tightly connected to the air inlet pipe 24. The arrangement direction of the heat conducting plate 251 is parallel to the moving direction of the material. An active cavity 2511 and a guide hole 2512 are provided in the heat conducting plate 251. The first piston 252 is slidably connected to the active cavity 2511. One end of the airbag 253 abuts against the inner wall of the active cavity 2511, and the other end of the airbag 253 abuts against the first piston 252. The iron core 254 is provided with a coil 255, a repelling magnet 256 and a second piston 257. The core 254 is firmly connected to the first piston 252, the iron core 254 is slidably connected to the guide hole 2512, the coil 255 is wound around the outside of the guide hole 2512, the coil 255 is externally connected to a power source, the iron core 254 is inserted into the coil 255 to form an electromagnet, a first chamber 241 and a second chamber 242 are provided on the intake pipe 24, the second piston 257 is slidably connected to the first chamber 241, the repelling magnet 256 is firmly connected to the second piston 257, the repelling magnet 256 and the iron core 254 are arranged opposite to each other, and the opposite ends of the repelling magnet 256 and the electromagnet are the same magnetic poles.

[0036] The regulating assembly 25 is located on the air inlet pipe 24 at a position inside the guide pipe 22. The molten plastic fluid can pass through the regulating assembly 25. The heat conducting plate 251 parallel to the moving direction of the material can reduce the resistance to the plastic fluid and can directly contact the molten plastic, that is, it can quickly sense the temperature change of the molten plastic. When the temperature of the molten plastic increases, the airbag 253 expands due to the heat, driving the first piston 252 to move upward along the active cavity 2511, and also driving the iron core 254 to move upward along the guide hole 2512, that is, increasing the distance that the iron core 254 is inserted into the coil 255, so that the magnetic force of the electromagnet composed of the iron core 254 and the coil 255 increases, and the repelling magnet 256 and the facing end of the electromagnet are the same magnetic poles. According to the principle of like poles repelling each other, the repelling magnet 256 will be subjected to an upward magnetic force, thereby driving the second piston 257 to move upward along the first chamber 241; that is, the higher the temperature of the molten plastic, the longer the distance that the second piston 257 moves along the first chamber 241.

[0037] A movable component 26 is provided in the air intake pipe 24, and the movable component 26 includes a movable plate 261 and a support spring 262. The movable plate 261 is slidably connected to the second chamber 242, one end of the support spring 262 is fastened to the inner wall of the second chamber 242, and the other end of the support spring 262 is fastened to the movable plate 261. The movable plate 261 is arranged at an angle, and the first chamber 241 is communicated with the second chamber 242, and hydraulic oil is filled in the first chamber 241 and the second chamber 242.

[0038] The discharge temperature of the extruder 1 fluctuates to a certain extent, which will cause the temperature of the extruded parts to be high and low. If the same air intake is used to cool the extruded parts, the heat dissipation effect cannot be guaranteed; the movable component 26 can adjust the flow cross-section of the intake pipe 24 to adjust the amount of air intake, because the higher the temperature of the molten plastic, the longer the distance the second piston 257 moves along the first chamber 241. Under the transmission action of the hydraulic oil in the first chamber 241 and the second chamber 242, the movable plate 261 will be driven to move along the second chamber 242 toward the support spring 262. The support spring 262 is compressed, and the length of the movable plate 261 extending out of the second chamber 242 is shortened, so that the flow cross-section of the intake pipe 24 is increased, and the air intake is increased, that is, the higher the temperature of the molten plastic, the greater the air intake of the intake pipe 24; that is, the air intake of the intake pipe 24 is automatically adjusted according to the temperature of the molten plastic, that is, the heat dissipation efficiency of the extruded parts is automatically adjusted according to the temperature of the molten plastic.

[0039] The cross-sectional area of ​​the first chamber 241 is greater than the cross-sectional area of ​​the second chamber 242 .

[0040] Because the fluctuation amplitude of the discharge temperature of the extruder 1 is small, the distance moved by the first piston 252 driven by the airbag 253 is short, and the distance moved by the second piston 257 under the linkage of the first piston 252 is also short. According to Pascal's principle, by setting the cross-sectional area of ​​the first chamber 241 to be larger than that of the second chamber 242, the displacement of the second piston 257 is correspondingly amplified, thereby increasing the moving range of the movable plate 261, thereby improving the regulating effect of the air intake amount.

[0041] The cooling device 3 is provided with a cooling water tank 31 , into which cooling water is filled.

[0042] The double-lumen hose processed by the shaping mechanism 2 still has a certain amount of heat, and is cooled by the cooling water in the cooling water tank 31 to facilitate the subsequent cutting process.

[0043] The working principle of the present invention is as follows: the molten plastic flowing out of the extruder 1 flows into the extrusion flow channel between the two guide blocks 232 and the guide ring 233 after being guided by the guide block 232, forming a continuum with a cross section similar to that of the outlet of the extrusion flow channel. The compressed gas introduced through the air inlet pipe 24 flows into the inlet flow channel 2323, and then flows out from the outlet on the step surface 2322 through the outlet flow channel 2324, that is, an airflow barrier is formed around the step surface 2322, and the airflow is used to support the circumference of the extrusion piece flowing out of the extrusion flow channel, that is, contactless support for the extrusion piece is achieved, so that the soft extrusion piece just extruded is supported, which plays a role in preventing deformation, and reduces the friction between the extrusion piece and the guide block 232, thereby improving the smoothness of the extrusion piece. In addition, the flowing airflow can also take away the heat of the extrusion piece, and pre-cool and harden the extrusion piece; the molten plastic fluid passes through the regulating component 25, and the heat conducting plate 251 can directly contact the molten plastic The material can quickly sense the temperature change of the molten plastic. When the temperature of the molten plastic rises, the airbag 253 expands due to the heat, driving the first piston 252 to move upward along the movable chamber 2511, and also driving the iron core 254 to move upward along the guide hole 2512, that is, increasing the distance of the iron core 254 inserted into the coil 255, so that the magnetic force of the electromagnet composed of the iron core 254 and the coil 255 increases, and the repelling magnet 256 and the opposite end of the electromagnet are the same magnetic poles. According to the principle of like poles repel each other, the repelling magnet 256 will be subjected to an upward magnetic force, thereby driving the second piston 257 to move upward along the first chamber 241. Under the transmission action of the hydraulic oil in the first chamber 241 and the second chamber 242, the movable plate 261 will be driven to move along the second chamber 242 toward the direction of the supporting spring 262, and the supporting spring 262 is compressed by force, and the length of the movable plate 261 extending out of the second chamber 242 is shortened, so that the flow cross-section of the intake pipe 24 is increased, thereby increasing the intake volume.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A double-cavity hose forming device with fixed-point cutting function, characterized in that: The double-cavity hose forming device comprises an extruder (1), a shaping mechanism (2), a cooling device (3), a traction device (4) and a cutter (5), wherein the shaping mechanism (2) is tightly connected to the extruder (1), the shaping mechanism (2) is located at the discharge port of the extruder (1), the cooling device (3), the traction device (4) and the cutter (5) are arranged in sequence along the conveying direction of the hose, the cooling device (3) is used to cool the hose after shaping, the traction device (4) is used to drive the hose to move, and the cutter (5) is used to cut the hose at a fixed point.

2. The double-cavity hose forming device with fixed-point cutting function according to claim 1, characterized in that: The shaping mechanism (2) comprises a fixed flange (21), a guide pipe (22), a die assembly (23) and an air inlet pipe (24); the discharge port of the extruder (1) is provided with a connecting flange (11); the fixed flange (21) is tightly connected to the connecting flange (11); the guide pipe (22) is tightly connected to the fixed flange (21); the guide pipe (22) is communicated with the discharge port of the extruder (1); the die assembly (23) is tightly connected to the guide pipe (22); the air inlet pipe (24) is communicated with the die assembly (23); the air inlet pipe (24) is connected to an external air source; an adjusting component (25) is provided on the air inlet pipe (24); the adjusting component (25) is used to adjust the air intake amount.

3. The double-cavity hose forming device with fixed-point cutting function according to claim 2, characterized in that: The die head assembly (23) comprises a fixing frame (231), a guide block (232) and a guide ring (233); the fixing frame (231) is tightly connected to the inner wall of the guide tube (22); the guide block (232) is tightly connected to the fixing frame (231); the guide ring (233) is tightly connected to the guide tube (22); the guide ring (233) is sleeved on the outer side of the guide block (232); two guide blocks (232) are provided; an extrusion flow channel is provided between the two guide blocks (232) and the guide ring (233); the cross section of the extrusion flow channel is the same as the cross section of the double-lumen hose.

4. The double-cavity hose forming device with fixed-point cutting function according to claim 3 is characterized in that: The guide block (232) is provided with an inclined surface (2321), a step surface (2322), an inlet flow channel (2323) and an outlet flow channel (2324); the inclined surface (2321) plays a guiding role; the inlet flow channel (2323) is connected to the inlet pipe (24); the outlet flow channel (2324) is connected to the inlet flow channel (2323); and the outlet of the outlet flow channel (2324) is evenly distributed on the step surface (2322).

5. The double-cavity hose forming device with fixed-point cutting function according to claim 4, characterized in that: The regulating assembly (25) comprises a heat conducting plate (251), a first piston (252), an airbag (253), an iron core (254), a coil (255), a repelling magnet (256) and a second piston (257). The heat conducting plate (251) is tightly connected to the air inlet pipe (24). The arrangement direction of the heat conducting plate (251) is parallel to the moving direction of the material. An active cavity (2511) and a guide hole (2512) are provided in the heat conducting plate (251). The first piston (252) is slidably connected to the active cavity (2511). One end of the airbag (253) abuts against the inner wall of the active cavity (2511), and the other end of the airbag (253) abuts against the first piston (252). The iron core (254) is tightly connected to the first piston (252), the iron core (254) is slidably connected to the guide hole (2512), the coil (255) is wound around the outside of the guide hole (2512), the coil (255) is externally connected to a power source, the iron core (254) is inserted into the coil (255) to form an electromagnet, the intake pipe (24) is provided with a first chamber (241) and a second chamber (242), the second piston (257) is slidably connected to the first chamber (241), the repelling magnet (256) is tightly connected to the second piston (257), the repelling magnet (256) and the iron core (254) are arranged opposite to each other, and the opposite ends of the repelling magnet (256) and the electromagnet are magnetic poles of the same name.

6. The double-cavity hose forming device with fixed-point cutting function according to claim 5, characterized in that: A movable assembly (26) is provided in the air intake pipe (24), and the movable assembly (26) comprises a movable plate (261) and a support spring (262). The movable plate (261) is slidably connected to the second chamber (242), one end of the support spring (262) is firmly connected to the inner wall of the second chamber (242), and the other end of the support spring (262) is firmly connected to the movable plate (261). The movable plate (261) is arranged obliquely, and the first chamber (241) is communicated with the second chamber (242). Hydraulic oil is filled in the first chamber (241) and the second chamber (242).

7. The double-cavity hose forming device with fixed-point cutting function according to claim 6, characterized in that: The cross-sectional area of ​​the first chamber (241) is greater than the cross-sectional area of ​​the second chamber (242).

8. The double-cavity hose forming device with fixed-point cutting function according to claim 1, characterized in that: The cooling device (3) is provided with a cooling water tank (31), and the cooling water tank (31) is filled with cooling water.

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