A plastic hose forming device

Abstract

This invention relates to the field of extrusion processes and discloses a plastic hose forming apparatus, comprising an extrusion mechanism, a die head, a shaping mechanism, and a suspension and pressure control mechanism connected in series. The output end of the die head is connected to the input end of the shaping mechanism via a heat-insulating sleeve. The suspension and pressure control mechanism includes a suspension base and a plug suspended within the extruded hose. The plug has a diameter smaller than the inner diameter of the extruded hose and a circumferential gap, allowing a section of the extruded hose within the shaping mechanism to be partially blocked by the die head and the plug, forming a dynamic pressure boosting section. A pressure output port is located at the center of the die head's output end, supplying pressure to the dynamic pressure boosting section. Continuous air supply and pressure boosting maintains dynamic stability of the pressure in the dynamic pressure boosting section within the shaping mechanism. When the outer layer material of the multi-layered hose is adsorbed, the inner layers are pushed outward by pressure, maintaining a compressed state between the layers, promoting molecular diffusion, and enhancing interlayer bonding.

Description

Technical Field

[0001] This invention relates to the field of extrusion processes, and more particularly to a plastic hose forming apparatus. Background Technology

[0002] Flexible hoses, also known as flexible conduits, are widely used in various fields such as gas, liquid, and circuit packaging due to their flexibility, pressure resistance, temperature resistance, and corrosion resistance. Depending on the application, the material requirements for the hose vary significantly. In some cases, multiple layers of different materials are needed for the hose wall. This requires a multi-extrusion production process, where various materials are melted separately in different extruders and then converged into a single die. The die is designed with layered flow channels to allow each layer of melt to meet and be extruded together under optimal rheological conditions. During the shaping and cooling process, the melt molecules diffuse to form an interpenetrating structure, enhancing the bonding strength.

[0003] However, in cases where the bonding force between the layers of a multi-layered hose is weak due to special working conditions, the vacuum shaping device uses negative pressure to adsorb the outer tube wall material, making the already weak interlayer bonding force more easily pulled apart, resulting in problems such as unstable interlayer connections.

[0004] How to proactively provide external pressure to improve the interlayer bonding of multilayer hoses and optimize product quality when the material bonding force is weak is an important problem that urgently needs to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a method that appropriately increases the internal pressure in the interval between the hose extrusion port and the vacuum shaping device, so that each layer is pressed from the inside out, thereby improving molecular diffusion efficiency and enhancing interlayer bonding force.

[0006] The specific technical solution is as follows:

[0007] A plastic hose forming device includes an extrusion mechanism, a die head, a shaping mechanism, and a suspension and pressure control mechanism connected in series. The output end of the die head is connected to the input end of the shaping mechanism via a heat-insulating sleeve. The suspension and pressure control mechanism includes a suspension base and a plug suspended inside the extruded hose. The diameter of the plug is smaller than the inner diameter of the extruded hose, and a circumferential gap is reserved, so that a section of the extruded hose located in the shaping mechanism is partially blocked by the die head and the plug to form a dynamic pressure boosting section. An air pressure output port is provided at the center of the output end of the die head to output air pressure to the dynamic pressure boosting section.

[0008] Preferably, the extrusion mechanism is a single extruder or a multi-extruder co-extrusion structure.

[0009] Preferably, the embolic body is a permanent magnet; the suspension base includes a horizontal electromagnetic component and a vertical electromagnetic component. The horizontal electromagnetic components are horizontally symmetrically arranged on both sides of the embolic body and have the same corresponding magnetic poles. The horizontal lateral gap of the embolic body is adjusted by controlling the power of the electromagnets. The vertical electromagnetic components are longitudinally symmetrically arranged above and below the embolic body, with the lower magnetic poles having the same corresponding magnetic poles and the upper magnetic poles repelling each other, so as to balance the weight of the embolic body and keep it suspended.

[0010] Preferably, the suspension base further includes a voltage stabilizing coil arranged around the extrusion hose, the voltage stabilizing coil being powered by a servo power supply to balance the driving force of the dynamic pressurization section pressure on the embolus.

[0011] Preferably, the air pressure output port is connected to a servo air pump for precise control of the air pressure in the dynamic boosting section.

[0012] Preferably, it also includes a control terminal, which is communicatively connected to the servo power supply of the servo air pump, the horizontal electromagnetic component, the vertical electromagnetic component and the voltage stabilizing coil, respectively, to coordinate the control of the gravity balance of the embolism and the front and rear forces of the embolism during the dynamic pressurization stage air pressure flow change process.

[0013] Preferably, it also includes an ultrasonic sensor that is communicatively connected to the control terminal. The ultrasonic sensor is used to monitor the gap distance between the plug and the extrusion hose, and the ultrasonic waves emitted by the ultrasonic sensor are also used to micro-perturb the interlayer melt interface to promote molecular diffusion.

[0014] Preferably, the embolus body is spear-shaped to reduce the impact of turbulence.

[0015] Preferably, the die head is divided into feed channels by feed blocks to form a number of feed channels matching the number of extruders, and the channels converge in layers at the output end.

[0016] Preferably, it further includes a cooling mechanism and a cutting mechanism connected after the suspension pressure control mechanism, wherein the cooling mechanism is used to cool the extrusion hose and the cutting mechanism is used to cut the extrusion hose to the required length.

[0017] The beneficial effects of this invention are:

[0018] By controlling the suspended plug to form a semi-closed cavity inside the extrusion hose to block the gas, and without the plug itself contacting the inner wall of the hose, although the pressurized gas may leak through gaps, the pressure within the shaping mechanism can still be dynamically stabilized through continuous gas supply. When the outer layer material of the multi-layer hose is adsorbed, the inner layers are pushed outwards by pressure, maintaining the compaction between the layers and promoting molecular diffusion. Furthermore, the pressure can be flexibly controlled by adjusting the gas pressure output and the plug position. This feedback regulation method is more flexible and effective than directly controlling the extruder's output pressure, significantly improving the quality of the extruded hose. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall device of the present invention.

[0021] Figure 2 This is a partial schematic diagram of the suspension pressure control mechanism of the present invention.

[0022] In the picture:

[0023] 1. Extrusion mechanism; 2. Die head; 3. Shaping mechanism; 4. Suspension and pressure control mechanism; 5. Servo air pump; 6. Cooling mechanism; 7. Cutting mechanism; 8. Heat insulation sleeve;

[0024] 41 Suspension base; 42 Embolist; 43 Voltage stabilizing coil. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please refer to Figure 1-2 This embodiment provides a plastic hose forming device, whose frame is the same as that of the existing extrusion process, specifically including an extrusion mechanism 1, a die head 2, a shaping mechanism 3 and subsequent processing technology connected in sequence.

[0027] In order to provide pressure at the shaping mechanism 3, in this embodiment, a suspension pressure control mechanism 4 is connected to the output end of the shaping mechanism 3. The suspension pressure control mechanism 4 consists of two parts: a suspension base 41 surrounding the hose and a plug body 42 suspended inside the extrusion hose. The suspension base 41 provides a levitation force to the plug body 42 to keep the plug body 42 stable, so that the plug body 42 remains stationary inside the extrusion hose. The output end of the die head 2 and the input end of the shaping mechanism 3 are connected by a heat insulation sleeve 8 to provide pressure-resistant support for a section of the extrusion hose between the die head 2 and the shaping mechanism 3. Finally, an air pressure output port located at the center is added inside the die head 2. Air is supplied by an external servo air pump 5, so that a section of the extruded hose located in the shaping mechanism 3 is partially blocked by the die head 2 and the plug body 42 to form a dynamic pressurization section. The air pressure of this section can be dynamically adjusted to make each layer of the multi-layer hose tightened from the inside out, so as to improve the molecular diffusion efficiency during the shaping process, provide a good foundation for subsequent cooling and curing, and improve the bonding force between the layers of the hose.

[0028] It is worth mentioning that the diameter of the plug body 42 is smaller than the inner diameter of the extrusion hose. This size setting ensures that the plug body 42 does not rub against the inner wall of the extrusion hose when it is in a stationary position, thus maintaining the integrity of the inner wall of the extrusion hose.

[0029] Due to different processing techniques, multi-layer hoses can be produced by single extruders or co-extrusion by multiple extruders. The improvement in this embodiment is located in the downstream process of the extruder, so it can be widely adapted to various extruder combinations and has an extremely wide range of applications.

[0030] Considering that magnetic or electromagnetic fields are affected by extreme heat, the solution in this embodiment is generally applied in the extrusion production of hoses in an environment with a temperature between 100°C and 200°C. Experiments have shown that the changes in magnetic or electromagnetic fields are relatively regular within this temperature range. The power correction value of the magnetic or electromagnetic field at each temperature setting can be adjusted through experiments without affecting the effect of magnetic levitation.

[0031] Based on the above experimental demonstrations, in this embodiment, the embolic body 42 is made of a permanent magnet. Horizontal and vertical electromagnetic components are respectively arranged around the embolic body 42 within the suspension base 41 to control the horizontal and vertical forces acting on the embolic body 42. Under the basic principle of like poles repelling and unlike poles attracting, the embolic body 42 maintains static equilibrium against gravity. Furthermore, both electromagnetic components are electromagnet structures, and their magnetic field strength can be finely adjusted via a control circuit. The position of the embolic body 42 is finely adjusted by coordinating the magnetic fields of each electromagnetic component.

[0032] When the gas pressure output port at the die head 2 begins to output pressurized gas, the plug body 42 will be subjected to an axial thrust. At this time, a counterforce needs to be provided to the plug body 42 to maintain its position and control the space of the dynamic pressurization section to remain unchanged, so that the gas in the dynamic pressurization section is compressed and pressurized, causing the wall of the extrusion hose to be pressed outward and tightly adhered to the inner wall of the shaping mechanism 3 under pressure. Since electromagnetic components are distributed around the plug body 42 to balance its suspension state, in this embodiment, the force-applying structure used to balance the gas pressure is made into a voltage-stabilizing coil 43 surrounding the extrusion hose. The voltage-stabilizing coil 43 is offset from each electromagnetic component, so that the axial end of the magnetic field generated by the voltage-stabilizing coil 43 acts on the plug body 42. Although the magnetic field in other directions has a certain influence on each electromagnetic component, experiments have shown that its influence on the suspension balance of the plug body 42 is minimal.

[0033] After achieving the structural design of suspending and balancing the embolic body 42 under pressure thrust, a feedback mechanism is needed to precisely control the adjustment range. In one embodiment, an ultrasonic sensor is also provided on the suspending base 41 or the shaping mechanism 3. This ultrasonic sensor differs from conventional ultrasonic sensors in that its ultrasonic frequency needs to be increased in this embodiment to penetrate electromagnetic and magnetic field interference and detect whether there is a gap and gap distance between the embolic body 42 and the extrusion hose. At the same time, the ultrasonic waves also have the effect of promoting molecular diffusion through micro-perturbations at the interlayer interfaces, further enhancing the bonding force between the layers while monitoring the state of the embolic body 42.

[0034] To achieve a complete and timely feedback adjustment link, in one embodiment, the molding device is also equipped with a control terminal, which is connected to the ultrasonic sensor, the control circuit of each electromagnetic component, the servo air pump 5, and the voltage stabilizing coil 43 for communication. This allows the feedback data acquired by the ultrasonic sensor to be converted into coordinated instructions and sent to each execution end in a timely manner. Based on the state of the embolized body 42, the dynamic air pump output, the current output of the voltage stabilizing coil 43, and the current output of each electromagnetic component are used to maintain the stability of the embolized body 42 while verifying whether the dynamic pressure in the dynamic pressurization section is within the normal threshold range.

[0035] Due to fluid effects, turbulence is generated when gas passes through the gap between the plug body 42 and the inner wall of the extrusion hose. The chaotic forces generated by this turbulence affect the suspension stability of the plug body 42, placing an additional adjustment burden on the actuators that regulate the balance of the plug body 42. To reduce this additional burden, in one embodiment, the plug body adopts a spear-shaped structure with conical ends and a cylindrical middle section. Its smooth, streamlined surface reduces airflow disturbance. Furthermore, this axial rotation configuration provides a stable center of gravity, facilitating the calculation of forces in all directions and offering the added benefit of easier balance control. The cylindrical middle section increases the self-weight and balance center of gravity, ensuring stable operation of the semi-enclosed dynamic pressurization section and reducing the likelihood of minor pressure fluctuations affecting the balance within the dynamic pressurization section.

[0036] In one embodiment, the structure of the traditional die head die 2 is modified so that an additional air pressure output port is added to the center of its output end and connected to the external servo air pump 5. Therefore, the layout of the internal feeding block is redesigned. The feeding block is divided into a corresponding number of flow channels according to the number of extruder feeding pipes. The end of the flow channel presents an interlocking output port design. An air pressure output port is reserved at the center. The air pressure output port is opened on the mold body fixed inside the die head die 2. An air vent is opened inside to the external connection end. Then, a heat-resistant pipe is connected to the servo air pump 5 from the outside to avoid the air supply pipe being damaged by high temperature heat melting.

[0037] After the extruded hose is shaped, it needs to undergo two more processes: cooling and cutting. In one embodiment, a cooling mechanism 6 and a cutting mechanism 7 are connected to the suspension pressure control mechanism 4. The shaped extruded hose is cooled and solidified before being cut to a predetermined size by the cutting mechanism 7.

[0038] It will be apparent to those skilled in the art that the present 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 characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A plastic hose forming device, characterized in that, The device comprises an extrusion mechanism, a die head, a shaping mechanism, and a suspension and pressure control mechanism connected in series. The output end of the die head is connected to the input end of the shaping device via a heat-insulating sleeve. The suspension and pressure control mechanism includes a suspension base and a plug suspended within the extrusion hose. The plug has a diameter smaller than the inner diameter of the extrusion hose and a circumferential gap is reserved to prevent it from contacting the inner wall of the extrusion hose. A section of the extrusion hose within the shaping mechanism is partially blocked by the die head and the plug, forming a dynamic pressure boosting section. A pressure output port is located at the center of the die head output end, supplying pressure to the dynamic pressure boosting section. The extrusion mechanism is a single extruder or a multi-extruder parallel co-extrusion structure; The embolic body is a permanent magnet; the suspension base includes a horizontal electromagnetic component and a vertical electromagnetic component. The horizontal electromagnetic component is symmetrically arranged on both sides of the embolic body and the magnetic poles are the same. The horizontal lateral gap of the embolic body is adjusted by controlling the power of the electromagnet. The vertical electromagnetic component is symmetrically arranged on the upper and lower sides of the embolic body. The lower magnetic poles are the same and the upper magnetic poles repel each other to balance the weight of the embolic body and keep it suspended. The suspension base also includes a voltage stabilizing coil arranged around the extrusion hose. The voltage stabilizing coil is powered by a servo power supply to balance the driving force of the dynamic pressurization section pressure on the embolization body. The air pressure output port is connected to a servo air pump for precise control of the air pressure in the dynamic boosting section. It also includes a control terminal, which is communicatively connected to the servo power supply of the servo air pump, the horizontal electromagnetic component, the vertical electromagnetic component and the voltage stabilizing coil, respectively, to coordinate the control of the gravity balance of the embolized body and the front and rear forces of the embolized body during the dynamic pressurization stage air pressure flow change process; The embolus body is spear-shaped to reduce the impact of turbulence; The die head is divided into feed channels by feed blocks to form a number of feed channels matching the number of extruders, and the channels converge in layers at the output end.

2. The plastic hose forming apparatus according to claim 1, characterized in that: It also includes an ultrasonic sensor that is communicatively connected to the control terminal. The ultrasonic sensor is used to monitor the gap distance between the plug and the extrusion hose. The ultrasonic waves emitted by the ultrasonic sensor are also used to perturb the interlayer melt interface to promote molecular diffusion.

3. The plastic hose forming apparatus according to claim 1, characterized in that: It also includes a cooling mechanism and a cutting mechanism connected after the suspension pressure control mechanism. The cooling mechanism is used to cool the extrusion hose, and the cutting mechanism is used to cut the extrusion hose to the required length.

Images