A high-stability injection mold casting structure

Abstract

The utility model relates to the technical field of injection molding machines, and discloses a high-stability injection mold casting structure, comprising a nozzle throat, a nozzle sleeve, and a heating nozzle. The nozzle throat is fixedly installed at the bottom of the nozzle sleeve, the bottom of the nozzle throat is fixedly connected to the heating nozzle, a cooling sleeve is coaxially arranged on the heating nozzle, the top of the cooling sleeve is fixedly connected to the nozzle throat, a cooling pipe with coolant passing therein is provided inside the cooling sleeve, the inner wall of the cooling sleeve in the structure is the same as the magnetic pole of the heating nozzle to generate a magnetic field balance and maintain stability, when the heating nozzle vibrates, the cooling sleeve generates a repulsive force on the heating nozzle to offset the vibration force of the nozzle, and reduces the temperature of the cooling sleeve through the coolant, when the temperature of the cooling sleeve is reduced, the temperature is conducted to the heating nozzle through the filling layer, so that the temperature of the nozzle is reduced, thereby reducing the deformation of the nozzle, reducing the vibration of the nozzle, making the plastic flow more stable, and improving the quality of the product.

Description

Technical Field

[0001] The utility model relates to the technical field of injection molding machines, in particular to a high-stability injection mold casting structure. Background Art

[0002] The structure refers to the layout and structure of the runners, nozzles and cooling systems inside the mold. Whether its design is reasonable or not directly affects the quality and production efficiency of injection molded products. In the injection mold, the pouring structure plays an important role in guiding the flow of molten plastic, cooling plastic, and filling the mold cavity. First of all, the runner system is a key part of the pouring structure of the injection mold. The runner system is a channel system that guides the molten plastic from the nozzle of the injection molding machine to the mold cavity. Its design should try to keep the flow of the molten plastic uniform and avoid the problems of bubbles and short filling. Common runner forms include straight runners, annular runners, fan-shaped runners, etc. When designing the runner system, factors such as the path, flow rate, and flow rate of the plastic flow need to be considered to ensure that the molten plastic can smoothly fill the mold cavity. Secondly, the nozzle is the part where the molten plastic enters the runner system from the injection molding machine. The design of the nozzle should ensure that the molten plastic can smoothly enter the runner system and can evenly fill the mold cavity. The nozzle is usually composed of a valve, a nozzle sleeve, and a nozzle core. In the design of the nozzle, factors such as the fluidity, pressure, and temperature of the plastic need to be considered to ensure that the nozzle can achieve accurate control and stable injection. In addition, the cooling system is an important part of the injection mold casting structure. The cooling system is the part that quickly dissipates the heat inside the mold. The design of the cooling system should ensure that the temperature in the mold cavity can be evenly reduced in order to speed up the injection cycle and improve production efficiency. Common cooling system forms include cooling water channels and cooling air channels. In the design of the cooling system, factors such as the material properties of the plastic, the size of the mold, and the requirements of the injection molded product need to be considered to ensure that the cooling system can effectively cool the plastic and achieve rapid cooling and uniform shrinkage. In addition to the above three main parts, the injection mold casting structure also includes some auxiliary structures, such as nozzle plugging devices, valve control systems, hot runner systems, etc. The design and selection of these structures should be determined according to the specific injection molding product requirements and production conditions.

[0003] In the casting structure of the injection mold, the nozzle is a part that is prone to vibration. When the nozzle is heated, the plastic material melts inside the nozzle and becomes a flowing state. At this time, the volume of the nozzle changes due to the thermal expansion and contraction effect of the molten plastic. This volume change may cause the contact state between the nozzle and the mold to change, which in turn causes vibration of the nozzle. In addition, when the nozzle is heated, the temperature gradient of the plastic material will cause thermal stress inside the nozzle. This thermal stress will also cause slight changes in the shape of the nozzle, which will cause vibration and lead to unstable flow of the plastic during the injection molding process, resulting in defects such as uneven casting surface, inconsistent size, pores or short shots. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides a highly stable injection mold casting structure, which has the advantages that the nozzle structure of the injection mold casting is stable during the casting process and will not generate vibration, thereby reducing the generation of casting surface defects. It solves the problem that the nozzle of the existing injection mold casting structure will produce thermal expansion and contraction effect when heated, causing the volume of the nozzle to change and causing the nozzle to vibrate.

[0006] (II) Technical solution

[0007] In order to achieve the purpose of ensuring that the nozzle structure of the above-mentioned injection mold casting is stable and does not vibrate during the casting process and reducing the defects on the casting surface, the utility model provides the following technical solutions: a highly stable injection mold casting structure, comprising a nozzle throat, a nozzle sleeve, and a heating nozzle, the nozzle throat is fixedly installed at the bottom of the nozzle sleeve, the bottom of the nozzle throat is fixedly connected to the heating nozzle, the heating nozzle is coaxially provided with a cooling sleeve, the cooling sleeve is made of a magnet, the magnetic poles of the inner wall of the cooling sleeve are the same as the magnetic poles of the heating nozzle, the top of the cooling sleeve is fixedly connected to the nozzle throat, a cooling pipe with coolant passing therein is provided inside the cooling sleeve, a coolant outlet is provided at one end of the top of the cooling pipe, and a coolant inlet is provided at the other end of the cooling pipe.

[0008] Preferably, the cooling pipe is spirally arranged along the vertical direction of the cooling sleeve.

[0009] Preferably, the inner diameter of the cooling sleeve is larger than the outer diameter of the heating nozzle, a filling layer is provided between the cooling sleeve and the heating nozzle, and the filling layer is filled with a material with a high thermal conductivity coefficient.

[0010] Preferably, the coolant outlet and the coolant inlet have conical cross-sections.

[0011] Preferably, the outer wall of the cooling sleeve is coaxially fixedly connected with a heat-insulating layer, and the heat-insulating layer is made of heat-insulating material.

[0012] Preferably, a fixing plate is provided on the top of the nozzle sleeve, and two or more connecting holes penetrating the fixing plate are provided on the fixing plate, and the connecting holes are arranged in an array along the circumferential direction of the fixing plate.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model provides a highly stable injection mold casting structure, which has the following beneficial effects:

[0015] 1. A high-stability injection mold casting structure, through the coordinated use of a cooling sleeve structure and a heating nozzle structure, compared with the traditional technical structure, the inner wall of the cooling sleeve in the structure is the same as the magnetic pole of the heating nozzle, which can produce a magnetic field balance and maintain stability. When the heating nozzle vibrates, the cooling sleeve produces a repulsive force on the heating nozzle, thereby offsetting the vibration force of the nozzle and reducing the vibration of the heating nozzle. In addition, the magnet has good thermal conductivity and can quickly conduct the temperature to the outer wall of the cooling sleeve. By lowering the temperature of the outer wall of the nozzle, the thermal expansion of the nozzle material can be reduced, deformation and stress can be reduced, and the vibration of the nozzle can be reduced, thereby improving the stability and quality of injection molding.

[0016] 2. This high-stability injection mold casting structure uses a cooling sleeve structure in conjunction with a cooling pipe structure. Compared with the traditional technical structure, the structure reduces the temperature of the cooling sleeve through the circulation of coolant. When the temperature of the cooling sleeve is reduced, the high thermal conductivity material filled in the filling layer conducts the temperature to the outer wall of the heating nozzle, thereby reducing the temperature of the outer wall of the nozzle. Reducing the temperature of the outer wall of the nozzle can reduce the thermal expansion of the nozzle material, thereby reducing the deformation and stress of the nozzle, reducing the vibration of the nozzle, making the plastic flow more stable, reducing product defects, improving product quality, reducing the vibration level of the equipment, extending the life of the equipment, and reducing the cost of maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a three-dimensional structural schematic diagram of a high-stability injection mold casting structure of the utility model;

[0018] Figure 2 This is a structural front view of a high-stability injection mold casting structure of the utility model;

[0019] Figure 3 This is a top view of the structure of a high-stability injection mold casting structure of the utility model;

[0020] Figure 4 This is a structural AA cross-sectional view of a high-stability injection mold casting structure of the utility model.

[0021] In the figure: 1-nozzle throat, 2-nozzle sleeve, 3-heating nozzle, 4-cooling sleeve, 5-cooling pipe, 6-coolant outlet, 7-coolant inlet, 8-filling layer, 9-insulation layer, 10-fixing plate, 11-connecting hole. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 A high-stability injection mold casting structure includes a nozzle throat 1, a nozzle sleeve 2, and a heating nozzle 3. The nozzle throat 1 is fixedly installed at the bottom of the nozzle sleeve 2, and the heating nozzle 3 is fixedly connected to the bottom of the nozzle throat 1. The heating nozzle 3 converts electrical energy into thermal energy through the internal heating element, and conducts the heat to the plastic material column. In this way, the plastic material column can be kept within a certain temperature range, maintaining appropriate fluidity and plasticity, and the heating element inside the heating nozzle 3 adopts a zoned heating design, which can achieve uniform heating of the plastic material column. This helps to avoid uneven hot and cold in the material column and ensure the uniformity and stability of the plastic during the injection process. The heating nozzle 3 is coaxially provided with a cooling sleeve 4, and the cooling sleeve 4 is made of a magnet. The inner wall magnetic poles of the cooling sleeve 4 are the same as the magnetic poles of the heating nozzle 3. The inner wall of the cooling sleeve 4 is the same as the magnetic poles of the heating nozzle 3, which can generate a magnetic field balance and maintain stability. When the heating nozzle 3 vibrates, the cooling sleeve 4 generates a repulsive force on the heating nozzle 3, thereby offsetting the vibration force of the nozzle and reducing the vibration of the heating nozzle 3. In addition, the magnet has good thermal conductivity and can quickly conduct the temperature to the outer wall of the cooling sleeve 4. The top of the cooling sleeve 4 is fixedly connected to the nozzle throat 1. The cooling sleeve 4 is provided with a cooling pipe 5 with coolant flowing inside. A coolant outlet 6 is provided at one end of the top of the cooling pipe 5, and a coolant inlet 7 is provided at the other end. The coolant is introduced through the cooling pipe 5 inside the cooling sleeve 4, and the coolant flows through the cooling sleeve 4, which can effectively absorb the heat of the nozzle and reduce the nozzle temperature.

[0024] See also Figure 4, the cooling pipe 5 is arranged in a spiral shape along the vertical direction of the cooling sleeve 4. The inner diameter of the cooling sleeve 4 is larger than the outer diameter of the heating nozzle 3. A filling layer 8 is arranged between the cooling sleeve 4 and the heating nozzle 3, and the filling layer 8 is filled with a high thermal conductivity material. The filling layer 8 is filled between the cooling sleeve 4 and the heating nozzle 3, which can fill the gap between the two, reduce the thermal resistance during heat conduction, and improve the efficiency of heat conduction. The inner diameter of the cooling sleeve 4 is larger than the outer diameter of the heating nozzle 3. The filling layer 8 plays a role of filling and supporting in this gap, maintaining the fixation and stability between the cooling sleeve 4 and the heating nozzle 3. The presence of the filling layer 8 can also reduce the gradient change of the temperature of the outer wall of the nozzle, make the nozzle temperature more uniform, and further reduce the thermal expansion and deformation of the nozzle. The cross-sections of the coolant outlet 6 and the coolant inlet 7 are conical in shape, and the conical cross-section can accelerate the flow rate of the coolant and make the coolant flow faster in the pipeline. The fast-flowing coolant can more effectively take away the heat of the nozzle, thereby reducing the temperature of the nozzle more quickly, and due to the design of the tapered cross-section, the flow rate of the coolant at the outlet and inlet increases, and the pressure loss of the liquid is relatively small. This can reduce the energy loss of the coolant during the flow process and ensure sufficient coolant inflow and outflow. The outer wall of the cooling sleeve 4 is also coaxially fixedly connected with an insulation layer 9, and the insulation layer 9 is made of insulation material. The insulation layer 9 can effectively isolate the external environment and the cooling sleeve 4, reduce the heat conduction of the external environment to the cooling sleeve 4, and avoid the outer wall temperature of the cooling sleeve 4 being too low, thereby preventing the condensation of water droplets on the surface during the injection molding process. Such condensed water droplets may affect the injection molded product, such as causing defects on the surface of the product and reducing the appearance quality of the product. A fixed disk 10 is provided at the top of the nozzle sleeve 2, and two or more connection holes 11 penetrating the fixed disk 10 are provided on the fixed disk 10, and the connection holes 11 are arranged in an array along the circumferential direction of the fixed disk 10.

[0025] Working principle: When the heating nozzle 3 is working, the coolant circulates and flows into the cooling sleeve 4 through the cooling pipe 5, reducing the temperature of the cooling sleeve 4. When the temperature of the cooling sleeve 4 is reduced, the high thermal conductivity material filled in the filling layer 8 conducts the temperature to the outer wall of the heating nozzle 3, thereby reducing the temperature of the outer wall of the nozzle. Reducing the temperature of the outer wall of the nozzle can reduce the thermal expansion of the nozzle material, thereby reducing the deformation and stress of the nozzle and reducing the vibration of the nozzle. In addition, the cooling sleeve 4 is made of magnets, and the magnetic poles of the inner wall of the cooling sleeve 4 are the same as those of the heating nozzle 3, and the cooling sleeve 4 is also fixed on the nozzle throat 1. When the heating nozzle 3 vibrates, the heating nozzle 3 will destroy the original magnetic field balance, causing the cooling sleeve 4 to generate a repulsive force on the heating nozzle 3. This repulsive force can offset the vibration force of the nozzle, thereby reducing the vibration of the heating nozzle 3.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0027] Although 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 appended claims and their equivalents.

Claims

1. A high-stability injection mold casting structure, comprising a nozzle throat (1), a nozzle sleeve (2), and a heating nozzle (3), wherein the nozzle throat (1) is fixedly mounted at the bottom of the nozzle sleeve (2), and the heating nozzle (3) is fixedly connected to the bottom of the nozzle throat (1), characterized in that: The heating nozzle (3) is coaxially provided with a cooling sleeve (4), the cooling sleeve (4) is made of a magnet, the magnetic poles of the inner wall of the cooling sleeve (4) are the same as the magnetic poles of the heating nozzle (3), the top end of the cooling sleeve (4) is fixedly connected to the nozzle throat (1), the cooling sleeve (4) is provided with a cooling pipe (5) through which a coolant flows, one end of the top of the cooling pipe (5) is provided with a coolant outlet (6), and the other end of the cooling pipe (5) is provided with a coolant inlet (7).

2. A highly stable injection mold casting structure according to claim 1, characterized in that: The cooling pipe (5) is in a spiral shape and is arranged along the vertical direction of the cooling sleeve (4).

3. The high stability injection mold casting structure according to claim 1, characterized in that: The inner diameter of the cooling sleeve (4) is greater than the outer diameter of the heating nozzle (3); a filling layer (8) is provided between the cooling sleeve (4) and the heating nozzle (3); and the filling layer (8) is filled with a material with a high thermal conductivity coefficient.

4. The high stability injection mold casting structure according to claim 1, characterized in that: The coolant outlet (6) and the coolant inlet (7) have conical cross-sections.

5. The high stability injection mold casting structure according to claim 3, characterized in that: The outer wall of the cooling sleeve (4) is also coaxially fixedly connected with a heat-insulating layer (9), and the heat-insulating layer (9) is made of heat-insulating material.

6. The high stability injection mold casting structure according to claim 1, characterized in that: A fixing plate (10) is arranged at the top of the nozzle sleeve (2), and two or more connection holes (11) are provided on the fixing plate (10) and penetrate the fixing plate (10). The connection holes (11) are arranged in an array along the circumferential direction of the fixing plate (10).

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