Anti-condensation hot runner injection mold

Abstract

The invention discloses an anti-condensation hot runner injection mold. The anti-condensation hot runner injection mold comprises a rotational flow cylinder, a heating ring seat and a flow assisting pipe, a rotational flow channel and a filling port are formed in the rotational flow cylinder, liquid flow is guided through the rotating movable guide hopper, it is ensured that molten plastic is evenly heated in the flowing process, and the condensation phenomenon is prevented. A heating coil is arranged in the heating ring base, temperature control is conducted through the constant-temperature control module, and it is ensured that the temperature of the hot runner is stable. The flow assisting pipe further heats the liquid flow through the multiple electric heating rings arranged in the axial direction, the temperature uniformity of the liquid flow is improved, and local condensation is avoided. By adopting an accurate temperature control system, an innovative flow control technology and a hot runner design, the flow efficiency of liquid flow is improved through the structural design of a rotational flow channel and a movable guide hopper, the flow property of the liquid flow is improved through a flow dividing and converging mechanism of a Tesla valve structure, the forming efficiency is effectively improved, waste materials are reduced, and the production cost is reduced. And the energy consumption in the injection molding process is optimized.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to an anti-condensation hot runner injection mold. Background Art

[0002] As one of the widely used processing technologies in modern industry, injection molding occupies an important position in the production of plastic products. The injection molding process injects molten plastic into the mold and forms the desired plastic product after cooling. With the development of technology, more and more high-precision and high-complexity plastic parts are widely used in various fields, such as electronic products, automobiles, medical devices, etc. In order to meet these needs, injection molding technology is constantly optimized and improved. Among them, the application of hot runner technology, especially in complex structure molds, has become an important means to improve production efficiency and product quality.

[0003] However, traditional injection molds have certain limitations in hot runner design, which are mainly manifested in the following aspects:

[0004] Condensation occurs: In traditional injection molds, due to the unreasonable design of the hot runner temperature control system, the plastic melt is prone to condensation during the flow of the mold due to uneven temperature control. Especially during the cooling stage, the mold surface and the interior are cooled unevenly, resulting in the temperature of some areas of the plastic melt being too low during the flow process, causing the plastic to condense and fail to smoothly fill the entire cavity of the mold. This not only affects the integrity of the product, but may also cause surface defects of the product, such as bubbles, cracks or surface roughness.

[0005] Uneven heating of hot runner: The hot runner heating system of traditional molds usually uses electric heating belts or electric heating tubes. Although they can provide a certain heating effect, they often have problems such as uneven heating and low heating efficiency. These problems lead to large temperature differences in the melt at different positions, which in turn leads to poor fluidity of the plastic during the filling process, incomplete filling, and ultimately affects the quality of the product.

[0006] Waste generation and resource waste: Due to the condensation phenomenon caused by uneven temperature, it is difficult to avoid the waste generated in many injection molding processes. Especially near the inner wall of the mold, the plastic condensation caused by low temperature causes an increase in waste. Waste not only increases production costs, but also increases the burden on the environment. In addition, uneven heating of the mold also leads to energy waste, increasing production costs.

[0007] In view of this, research and improvement are carried out on the existing problems, and an anti-condensation hot runner injection mold is provided to solve the current problems. The purpose is to solve the problems and improve the practical value through this technology. Summary of the invention

[0008] The present invention aims to solve one of the technical problems existing in the prior art or related technology.

[0009] To this end, the technical solution adopted by the present invention is: an anti-condensation hot runner injection mold, comprising:

[0010] The swirl tube is the main component of the mold. The spiral swirl channel is wound around its surface, which can guide the liquid flow in the direction of rotation to avoid condensation. The inner wall of the swirl channel is designed with an arc surface to reduce friction and improve flow efficiency.

[0011] Heating ring seat: The heating ring seat is used to provide uniform heating for the liquid flow. It has a built-in heating coil and can be precisely temperature controlled by a constant temperature control module to ensure that the liquid flow maintains a suitable temperature when passing through the cyclone.

[0012] Dynamic guide bucket and its structure: The dynamic guide bucket is connected to the swirl tube through an extrusion shaft, and a guide cone and swirl blades are arranged inside the dynamic guide bucket. The guide cone helps guide the liquid flow, and the swirl blades enhance the mixing and heating of the liquid flow through rotation to prevent local condensation of the liquid flow.

[0013] Flow-aiding tube: The flow-aiding tube includes a guide tube, a partition plate, an electric heating ring and a conical core shaft rod. It heats the liquid flow through the electric heating ring and further improves the fluidity of the liquid flow through the structure of the conical core shaft rod to avoid condensation.

[0014] Diverter ring and confluence ring: The diverter ring and confluence ring arranged in the cyclone form a Tesla valve structure, which adjusts the flow direction of the liquid through the diverter channel and the confluence channel, improves the flow efficiency, compensates for kinetic energy, and reduces the occurrence of condensation problems.

[0015] Beneficial Effects

[0016] The anti-condensation hot runner injection mold of the present invention effectively solves the condensation problem in traditional injection molds through the following technical innovations and has significant beneficial effects:

[0017] 1. Significant anti-condensation effect: The spiral design of the swirl tube and the dynamic guide bucket and the temperature control system of the heating ring seat ensure that the flow temperature of the liquid in the mold is uniform, avoiding condensation. The constant temperature control module in the heating ring seat ensures that the temperature of the liquid flow is always maintained in the appropriate range during the injection molding process, avoiding the condensation problem caused by temperature changes in traditional molds.

[0018] 2. Improve the quality of injection molding: The present invention ensures the uniform flow of the plastic melt through a precise temperature control system and flow control device, reducing the occurrence of bubbles, cracks and other defects during the injection molding process. Therefore, the quality of the molded product is higher and the surface smoothness is good.

[0019] 3. Improve injection efficiency: The structural design of the swirl channel and the dynamic guide bucket increases the flow efficiency of the liquid flow, and the flow performance of the liquid flow is improved through the flow division and confluence mechanism of the Tesla valve structure. This design not only improves the flow efficiency, but also effectively reduces the generation of waste and improves the overall production efficiency.

[0020] 4. Accurate temperature control, energy saving and consumption reduction: The present invention realizes efficient heating through the electric heating ring in the heating ring seat and the flow-aiding tube, and cooperates with the constant temperature control module for accurate temperature control, thus avoiding energy waste and uneven heating. The accuracy of the temperature control system greatly improves the heating efficiency, saves energy and reduces consumption, and reduces production costs.

[0021] 5. High temperature resistant and anti-stick coating design: The inner side of the swirl tube, dynamic guide bucket and flow-aiding tube are all coated with high temperature resistant anti-stick coating, which ensures that the mold will not fail or be blocked due to the adhesion of plastic melt during long-term operation. In addition, the high temperature resistance of the coating ensures that the mold can operate stably at high temperatures, extending the service life of the mold.

[0022] 6. Suitable for injection molding of various plastic materials: Due to the uniform heating and precise temperature control of the liquid flow, the anti-condensation hot runner injection mold of the present invention can meet the injection molding requirements of various plastic materials, and is particularly suitable for those injection molding products with strict requirements.

[0023] The anti-condensation hot runner injection mold of the present invention overcomes the molding defects caused by condensation in traditional molds through precise hot runner design, innovative temperature control and flow control technology, and improves injection efficiency and product quality. Through the application of the present invention, the generation of waste can be greatly reduced, the production efficiency can be improved, and there are significant economic benefits and technical advantages. Therefore, the invention is of great significance to the development of the injection molding industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of a cyclone tube and a heating ring seat according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of a cyclone tube according to an embodiment of the present invention;

[0027] Figure 4 It is a schematic diagram of the cross-sectional structure of a cyclone tube and a heating ring seat according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of a moving guide bucket and an extrusion shaft rod according to an embodiment of the present invention;

[0029] Figure 6This is a schematic diagram of the cross-sectional structure of a moving guide bucket and an extrusion shaft rod according to an embodiment of the present invention;

[0030] Figure 7 A schematic diagram of a partial cross-sectional structure of a heating ring seat according to an embodiment of the present invention;

[0031] Figure 8 The figure is a schematic diagram of the cross-sectional structure of a flow-aiding tube according to an embodiment of the present invention.

[0032] Reference numerals:

[0033] 100, swirl cylinder; 110, swirl channel; 120, drive motor; 130, dynamic guide bucket; 140, extrusion shaft; 150, first diverter ring; 160, second diverter ring; 111, filling port; 131, guide cone; 132, swirl vane; 141, extrusion swirl vane; 151, diverter channel; 152, converging channel;

[0034] 200, heating ring seat; 210, control terminal box; 220, heating coil;

[0035] 300, flow-assisting tube; 310, flow guide tube; 320, partition plate; 330, electric heating ring; 340, cone core shaft; 311, outer flow channel; 312, inner flow channel;

[0036] 400. Mould body. DETAILED DESCRIPTION

[0037] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0038] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0039] The following is combined with Figure 1-Figure 8 An anti-condensation hot runner injection mold provided by some embodiments of the present invention is described.

[0040] Example 1

[0041] As shown in the figure, in this embodiment, the anti-condensation hot runner injection mold is composed of a swirl tube 100, a heating ring seat 200 and a flow-aiding tube 300, and one end of the flow-aiding tube 300 is connected to the injection port on the surface of the mold body 400. Its working principle is based on the spiral design of the swirl channel 110, and the driving motor 120 drives the moving guide bucket 130 and the extrusion shaft 140 to rotate, thereby realizing the heating and flow compensation of the liquid flow.

[0042] The cyclone 100 is a main component of the injection mold, and is provided with a cyclone 110 and a filling port 111. The cyclone 110 is spirally wound around the surface of the cyclone 100, and its inner wall is an arc-shaped smooth surface, which can reduce friction, ensure smooth flow of the plastic melt, and avoid condensation.

[0043] The filling port 111 is arranged tangentially to the surface of the cyclone tube 100 and is used to inject molten plastic and make it flow evenly in the cyclone channel 110 .

[0044] The driving motor 120 drives the extrusion shaft 140 through the output shaft, thereby driving the dynamic guide bucket 130 to rotate, thereby realizing the transmission and heating of the liquid flow. The extrusion shaft 140 penetrates the interior of the cyclone tube 100, and the other end is connected to the dynamic guide bucket 130.

[0045] The moving guide bucket 130 is a conical structure, and is rotatably connected to the cyclone cylinder 100 through the extrusion shaft 140. A guide cone 131 and a swirl blade 132 are provided inside the guide bucket, and the guide cone 131 is fixedly connected to the end of the extrusion shaft 140. The swirl blade 132 cooperates with the swirl channel 110 to guide the flow of the liquid by rotating the moving guide bucket 130, so that the liquid is evenly heated.

[0046] The heating ring seat 200 is fixed to one end of the cyclone tube 100 and sleeved on the outer side of the moving guide bucket 130. A heating coil 220 is arranged inside the heating ring seat 200 for heating the liquid flow by the electric heating principle. The control end box 210 has a built-in constant temperature control module for temperature control of the heating coil 220 to ensure temperature stability.

[0047] The flow-aiding tube 300 includes a flow-guiding tube 310 and a partition plate 320 fixed to the inner side of the flow-guiding tube 310, an electric heating ring 330 and a conical core shaft 340. The electric heating ring 330 is sleeved on the outer circumference of the conical core shaft 340 to heat the liquid flow and improve its flow performance through the inner and outer flow channels 311 and 312. The electric heating ring 330 is evenly arranged along the axial direction of the flow-guiding tube 310 to ensure the temperature uniformity of the liquid flow in the flow-aiding tube.

[0048] A first flow divider ring 150 and a second flow divider ring 160 are installed inside the cyclone 100 to achieve flow division and convergence of the liquid flow. The first flow divider ring 150 has a conical cross section, and the second flow divider ring 160 has a rhombus cross section, forming a Tesla valve structure, which effectively guides the liquid flow through the branch channel 151 and the converging channel 152, improves the flow efficiency, and utilizes the kinetic energy compensation mechanism between the flow channels to reduce condensation.

[0049] The electric heating ring 330 has a built-in electric heating coil to ensure that the flow channels 311 and 312 in the flow-aiding tube 300 have a uniform heating effect, thereby avoiding condensation of the liquid flow during the transportation process. The electric heating ring 330 cooperates with the outer periphery of the conical core shaft 340 to ensure uniform heat conduction of the entire flow-aiding tube system.

[0050] Example 2

[0051] In this embodiment, the main structure of the anti-condensation hot runner injection mold is the same as that of Embodiment 1, but in this embodiment, the flow-aiding tube 300 further optimizes the design of the electric heating ring 330. The electric heating ring 330 uses a more efficient composite material, and the arrangement of its electric heating coils is also adjusted, so that the heating effect of the entire flow-aiding tube is more uniform and the temperature control response speed is faster.

[0052] By optimizing the heat conduction path between the inner and outer flow channels 311 and 312 of the guide tube 310 , the temperature difference of the plastic melt during the flow process can be further reduced, thereby avoiding condensation.

[0053] Working principle:

[0054] The driving system works as follows: the driving motor 120 drives the extrusion shaft 140 to rotate through the output shaft, and the extrusion shaft 140 drives the dynamic guide bucket 130 to rotate to achieve the transmission of the liquid flow. The rotation of the dynamic guide bucket 130 helps the liquid flow to pass through the cyclone 110 and form a spiral flow in the cyclone to promote the heating and uniform distribution of the liquid flow.

[0055] Heat conduction and control: The heating coil 220 in the heating ring seat 200 heats the liquid flow through the electric heating principle, and at the same time controls the constant temperature control module in the end box 210 to ensure the stability of the heating temperature. The electric heating ring 330 further heats the liquid flow in the flow-assisting tube 300 to ensure that the liquid flow maintains a uniform temperature throughout the injection molding process.

[0056] Heating and flow of liquid: After the liquid enters the cyclone tube 100 from the filling port 111, it enters the moving guide bucket 130 through the cyclone channel 110 and forms a cyclone under the action of the cyclone vanes 132. The liquid is further heated by the guide cone 131 and the cyclone vanes 132 in the moving guide bucket 130, and effective flow control is achieved through the diverter rings 150 and 160 to prevent condensation.

[0057] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An anti-condensation hot runner injection mold, characterized in that: A cyclone tube (100), a heating ring seat (200), a flow-assisting tube (300), and a mold body (400) connected to one end of the flow-assisting tube (300); a driving motor (120) is fixedly installed at one end of the cyclone tube (100); an output end of the driving motor (120) is fixedly connected to an extrusion shaft rod (140) that passes through the interior of the cyclone tube (100); the other end of the extrusion shaft rod (140) is fixedly connected to a moving guide bucket (130) that is rotatably connected to one end of the cyclone tube (100); the heating ring seat (200) is fixed to one end of the cyclone tube (100) and sleeved on the outside of the moving guide bucket (130); the other end of the moving guide bucket (130) is connected to the flow-assisting tube (100); The ends of the cyclone (100) are connected, a first diverter ring (150) and a second diverter ring (160) which are sleeved on the surface of the extrusion shaft (140) are fixedly installed on the inner side of the cyclone cylinder (100), a guide cone (131) and a swirl vane (132) located on the outer periphery of the guide cone (131) are fixedly installed on the inner side of the moving guide bucket (130), one end of the guide cone (131) is fixedly connected to the end of the extrusion shaft (140), the surface of the extrusion shaft (140) is provided with an extrusion swirl vane (141), and the surface of the cyclone cylinder (100) is provided with a swirl channel (110) and a filling port (111), and the port of the filling port (111) is connected to the end of the swirl channel (110).

2. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The cyclone (110) is spirally wound around the surface of the cyclone barrel (100), the filling port (111) is arranged tangentially to the surface of the cyclone barrel (100), and the cyclone (110) and the inner side of the cyclone (110) are in the shape of arc smooth surfaces.

3. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The inner sides of the cyclone cylinder (100), the moving guide bucket (130) and the flow-assisting tube (300) are all provided with a high-temperature resistant anti-stick coating.

4. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The cross section of the first diverter ring (150) is conical, and the cross section of the second diverter ring (160) is rhombus-shaped. The first diverter ring (150) is provided with a diverging channel (151) and a converging channel (152) on the inner and outer sides respectively. The inner side of the second diverter ring (160) is provided with a guide channel (161). One end of the diverging channel (151) and the converging channel (152) are connected and joined at the outer periphery of the second diverter ring (160).

5. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The outer periphery of the extrusion vane (141) is in sliding contact with the inner side of the second diverter ring (160), and the spiral directions of the extrusion vane (141) and the swirl vane (132) are uniform and the same as the spiral direction of the swirl channel (110).

6. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The moving guide bucket (130) is a conical structure, and the inner wall of the moving guide bucket (130) is arranged in parallel with the outer surface of the guide cone (131); the moving guide bucket (130), the guide cone (131) and the swirl vane (132) are metal components.

7. The anti-condensation hot runner injection mold according to claim 1, characterized in that: A control terminal box (210) is fixedly mounted on the surface of the heating ring seat (200), and a heating coil (220) is arranged on the inner side of the heating ring seat (200), and a constant temperature control module for the heating coil (220) is built into the control terminal box (210).

8. The anti-condensation hot runner injection mold according to claim 1, characterized in that: The flow-assisting tube (300) comprises a flow guide tube (310), a partition plate (320) fixed to the inner side of the flow guide tube (310), an electric heating ring (330) and a conical core shaft (340); the electric heating ring (330) is sleeved on the outer periphery of the conical core shaft (340); an outer flow channel (311) is provided between the outer periphery of the electric heating ring (330) and the inner wall of the flow guide tube (310); an inner flow channel (312) is provided between the inner side of the electric heating ring (330) and the conical core shaft (340); and both ends of the outer flow channel (311) and the inner flow channel (312) are connected to the outer flow channel (311).

9. The anti-condensation hot runner injection mold according to claim 8, characterized in that: The outer periphery of the conical core shaft (340) is parallel to the surface of the electric heating ring (330); the cross section of the electric heating ring (330) is conical; the outer flow channel (311) and the inner flow channel (312) are evenly distributed on the outer periphery of the conical core shaft (340) in a circumferential direction and are located between adjacent partition plates (320); an electric heating coil is provided inside the electric heating ring (330); and the electric heating ring (330) is evenly arranged along the axial direction of the guide tube (310).

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