Multi-point injection mold for child electric vehicle body

Abstract

The utility model discloses child electric vehicle body multi -point glue mould, including injection mold upper die and injection mold lower die. Injection mold upper die is equipped with the nipple, the positioning ring, the total passageway of supply, the distribution cavity and multiple sets of injection branch passageways, constitutes the multi -point glue system, realizes the balanced distribution and synchronous injection of molten material from the center to all around, effectively improved the filling shortage, the obvious combination line and the product deformation etc. problem caused by single point glue. The heating structure is still integrated in injection mold upper die, and its spiral heating pipeline surrounds distribution cavity and is enhanced through the turbulence boss of inner wall heat exchange, and heating oil flows into spiral heating pipeline through oil inlet channel from heating oil inlet, and after the auxiliary heating of the material that passes through distribution cavity, from oil outlet channel, heating oil outlet flows out, forms circulation, and effectively maintains material fluidity. The utility model improves the forming quality and production efficiency of large -scale thin -walled plastic parts through the collaborative design of multi -point glue and surrounding heating.

Description

Technical Field

[0001] This utility model relates to the field of children's electric vehicle production technology, specifically to a multi-point glue injection mold for the body of a children's electric vehicle. Background Technology

[0002] Injection molds are key process equipment in the production of plastic bodies for children's electric vehicles. During the injection molding process, plastic granules are heated and melted in the injection molding machine barrel. This molten plastic needs to be filled into the mold cavity through the mold's injection system (i.e., runner system), and after cooling and solidification, the product is formed. "Injection" refers to the process of molten plastic entering the mold cavity, and the design of the injection channel (or runner) directly affects the filling behavior of the plastic, product quality, and production efficiency.

[0003] Currently, single-point injection mold designs are commonly used in the production of large, thin-walled, or structurally complex plastic parts such as children's electric vehicle frames. This means that molten plastic is injected into the mold cavity through a single injection point. This single-point injection method has significant drawbacks: First, for large parts, the long flow path of the melt from the single injection point to the far end of the cavity can easily lead to problems such as insufficient filling, obvious weld lines, or internal stress concentration due to increased flow resistance and decreased temperature at the front end, affecting product strength and appearance. Second, single-point injection makes it difficult to ensure that the plastic is uniformly and synchronously filled into all parts of the cavity, easily leading to uneven product density, shrinkage and warping deformation, and poor dimensional stability.

[0004] Furthermore, after the molten plastic is heated to its optimal flow temperature in the injection molding machine barrel, its temperature gradually decreases as it enters the mold's injection channel. This temperature drop directly leads to increased melt viscosity and decreased fluidity. This not only exacerbates the aforementioned filling difficulties but may also require higher injection pressures, increasing energy consumption and equipment requirements.

[0005] Therefore, we propose a multi-point injection mold for the body of children's electric vehicles. Utility Model Content

[0006] (a) Technical problems to be solved To address the shortcomings of existing technologies, this utility model provides a multi-point injection mold for children's electric vehicle bodies. Through the synergistic design of multi-point injection and surrounding heating, it effectively improves the injection filling quality, maintains material flowability, and optimizes heat exchange efficiency and system reliability, thus effectively solving the problems in the background technology.

[0007] (II) Technical Solution To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-point injection mold for a children's electric vehicle body, including a lower injection mold and an upper injection mold. A nozzle is provided in the middle of the upper end of the upper injection mold. A positioning ring is provided on the upper part of the nozzle. A main feeding channel is provided in the lower part of the nozzle. The main feeding channel is located in the middle of the upper outer surface of the upper injection mold. A distribution cavity is located inside the lower end of the upper injection mold. The lower end of the main feeding channel is connected to the middle of the upper end of the distribution cavity. An injection branch channel is provided on the lower outer surface of the distribution cavity. There are multiple sets of injection branch channels, and the injection branch channels extend to the lower outer surface of the upper injection mold. A heating structure is installed in the upper injection mold. The heating structure includes a heating oil inlet, a heating oil outlet, an oil inlet channel, an oil outlet channel, a spiral heating pipe, a turbulence protrusion, and a filter screen. The spiral heating pipe is located outside the distribution cavity.

[0008] Preferably, the heating oil inlet is located at the right end of the upper outer surface of the upper injection mold, and the heating oil outlet is located at the left end of the upper outer surface of the upper injection mold.

[0009] Preferably, the oil inlet channel is located at the right end of the upper outer surface of the upper injection mold, the oil outlet channel is located at the left end of the upper outer surface of the upper injection mold, and the upper end of the oil inlet channel is fixedly connected to the lower end of the heating oil inlet, and the upper end of the oil outlet channel is fixedly connected to the lower end of the heating oil outlet.

[0010] Preferably, the filter screen is fixed at the bottom of the inner cavity of the heating oil inlet.

[0011] Preferably, the lower end of the oil inlet channel is connected to the right end of the spiral heating pipe, and the lower end of the oil outlet channel is connected to the left end of the spiral heating pipe.

[0012] Preferably, the turbulence protrusions are spaced apart along the extension direction of the spiral heating pipe.

[0013] (III) Beneficial Effects Compared with the prior art, this utility model provides a multi-point injection mold for the body of a children's electric vehicle, which has the following beneficial effects: 1. This multi-point injection mold for children's electric vehicle bodies, through the setting of a multi-point injection system consisting of a main material supply channel, a distribution cavity, and multiple injection branch channels, achieves balanced distribution and synchronous injection of molten material from the center to the surrounding areas; effectively shortens the flow path of the melt to various parts of the cavity, improves the defects such as insufficient filling, obvious joint lines, internal stress, and warping deformation caused by excessively long flow paths in single-point injection, and enhances the molding quality of large vehicle body parts.

[0014] 2. The multi-point injection mold for the children's electric vehicle body, through the heating structure set around the distribution cavity, can continuously and uniformly assist in heating the molten material flowing through the distribution cavity and branch channels; effectively compensates for the heat loss of the melt in the mold flow channel, thereby ensuring its good fluidity and improving the filling optimization of complex cavities.

[0015] 3. The multi-point injection molding of the children's electric vehicle body and the spiral heating pipes in the heating structure can increase the heat exchange area, while the turbulence protrusions set at intervals inside the pipes can enhance the turbulence effect of the heating oil and destroy the boundary layer, thereby improving the heat exchange efficiency and ensuring the uniformity and timeliness of heating. In addition, the filter screen set at the heating oil inlet can effectively filter out impurities in the heating medium, prevent pipe blockage, and ensure the long-term stable operation and reliability of the heating system. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the multi-point glue injection mold for the body of the children's electric vehicle of this utility model.

[0017] Figure 2 This is a side cross-sectional view of the upper injection mold in the multi-point injection mold of the children's electric vehicle body of this utility model.

[0018] Figure 3 This utility model relates to a multi-point injection mold for the body of a children's electric vehicle. Figure 2 Enlarged view of point A in the middle.

[0019] Figure 4 This is a schematic diagram of the heating oil inlet in the multi-point glue injection mold of the children's electric vehicle body of this utility model.

[0020] In the diagram: 1. Lower injection mold; 2. Upper injection mold; 3. Nozzle; 4. Positioning ring; 5. Heating structure; 6. Main material supply channel; 7. Distribution cavity; 8. Injection branch channel; 9. Heating oil inlet; 10. Heating oil outlet; 11. Oil inlet channel; 12. Oil outlet channel; 13. Spiral heating pipe; 14. Turbulence protrusion; 15. Filter screen. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0022] This embodiment is a multi-point injection mold for the body of a children's electric vehicle.

[0023] like Figure 1-4As shown, this utility model provides a multi-point injection mold for a children's electric vehicle body, including a lower injection mold 1 and an upper injection mold 2. A nozzle 3 is provided at the middle of the upper end of the upper injection mold 2, and a positioning ring 4 is provided at the upper part of the nozzle 3 for precise positioning with the injection molding machine nozzle. A main material supply channel 6 is connected to the lower part of the nozzle 3, and this main material supply channel 6 is located at the middle of the upper outer surface of the upper injection mold 2. A distribution cavity 7 is provided inside the lower end of the upper injection mold 2, and the lower end of the main material supply channel 6 is connected to the middle of the upper end of the distribution cavity 7. Multiple sets of injection branch channels 8 are provided on the lower outer surface of the distribution cavity 7, and all sets of injection branch channels 8 penetrate to the lower outer surface of the upper injection mold 2, thereby communicating with the mold cavity.

[0024] A heating structure 5 is integrated into the upper injection mold 2. The heating structure 5 includes a heating oil inlet 9, a heating oil outlet 10, an oil inlet channel 11, an oil outlet channel 12, a spiral heating pipe 13, a turbulence protrusion 14, and a filter screen 15. The spiral heating pipe 13 is arranged around the outside of the distribution cavity 7 to provide uniform and continuous auxiliary heating to the distribution cavity 7 and the molten plastic inside it.

[0025] Specifically, the heating oil inlet 9 is located at the right end of the upper outer surface of the upper injection mold 2, and the heating oil outlet 10 is located at the left end of the upper outer surface of the upper injection mold 2. The oil inlet channel 11 is located at the right end of the upper outer surface of the upper injection mold 2, and its upper end is connected to the lower end of the heating oil inlet 9. The oil outlet channel 12 is located at the left end of the upper outer surface of the upper injection mold 2, and its upper end is connected to the lower end of the heating oil outlet 10. The lower end of the oil inlet channel 11 is connected to the right end of the spiral heating pipe 13, and the lower end of the oil outlet channel 12 is connected to the left end of the spiral heating pipe 13, thus forming a complete heating oil circulation loop.

[0026] To ensure the long-term stable operation of the heating system, a filter screen 15 is fixedly installed at the bottom of the inner cavity of the heating oil inlet 9 to filter out impurities that may be carried in the heating oil and prevent the spiral heating pipe 13 from becoming blocked.

[0027] To enhance the heat exchange effect, multiple turbulence protrusions 14 are spaced apart on the inner wall of the spiral heating pipe 13 along its extension direction. These turbulence protrusions 14 can disrupt the laminar boundary layer of the heating oil, enhance the turbulence effect, and thus improve the heat exchange efficiency.

[0028] Working principle: During injection molding, the molten plastic is guided by the injection molding machine nozzle and positioning ring 4, enters the main feeding channel 6 through the nozzle 3, and then flows into the distribution cavity 7. In the distribution cavity 7, the molten material is evenly distributed to multiple sets of injection branch channels 8, and finally injected into the mold cavity simultaneously from multiple points, realizing multi-point injection, effectively shortening the melt flow path, and promoting uniform and rapid filling of the cavity.

[0029] Meanwhile, heating oil supplied by the external temperature control system is injected through the heating oil inlet 9, filtered by the filter screen 15, and then enters the spiral heating pipe 13 through the oil inlet channel 11. As the heating oil flows through the spiral heating pipe 13, which is spirally wound around the outside of the distribution cavity 7, its heat is conducted through the mold core material, providing auxiliary heating to the molten plastic near the distribution cavity 7 and the injection branch channel 8 connected to it, compensating for heat loss in the flow channel and maintaining its good fluidity. Turbulence protrusions 14 inside the pipe enhance the turbulence of the heating oil, improving heat exchange efficiency. After heat exchange, the heating oil flows back to the external system through the oil outlet 10 via the oil outlet channel 12, forming a circulation.

[0030] It should be noted that, in this document, relational terms such as first and second (number one, number two), etc., are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A multi-point injection mold for a child electric vehicle body, comprising a lower injection mold (1) and an upper injection mold (2), wherein a nozzle (3) is provided at the middle of the upper end of the upper injection mold (2), and a positioning ring (4) is provided at the upper part of the nozzle (3), characterized in that: The lower part of the nozzle (3) is provided with a main feeding channel (6), and the main feeding channel (6) is located in the middle of the upper outer surface of the upper mold (2). The distribution cavity (7) is located in the lower part of the upper mold (2). The lower end of the main feeding channel (6) is connected to the middle of the upper end of the distribution cavity (7). The lower outer surface of the distribution cavity (7) is provided with an injection branch channel (8). The number of injection branch channels (8) is multiple, and the injection branch channels (8) penetrate to the lower outer surface of the upper mold (2). The upper mold (2) is equipped with a heating structure (5). The heating structure (5) includes a heating oil inlet (9), a heating oil outlet (10), an oil inlet channel (11), an oil outlet channel (12), a spiral heating pipe (13), a turbulence protrusion (14), and a filter screen (15). The spiral heating pipe (13) is located outside the distribution cavity (7).

2. The multi-point injection mold for the body of a children's electric vehicle according to claim 1, characterized in that: The heating oil inlet (9) is located at the right end of the upper outer surface of the injection mold (2), and the heating oil outlet (10) is located at the left end of the upper outer surface of the injection mold (2).

3. The multi-point injection mold for the body of a children's electric vehicle according to claim 2, characterized in that: The oil inlet channel (11) is located at the right end of the upper outer surface of the injection mold (2), and the oil outlet channel (12) is located at the left end of the upper outer surface of the injection mold (2). The upper end of the oil inlet channel (11) is fixedly connected to the lower end of the heating oil inlet (9), and the upper end of the oil outlet channel (12) is fixedly connected to the lower end of the heating oil outlet (10).

4. The multi-point injection mold for the body of a children's electric vehicle according to claim 3, characterized in that: The filter screen (15) is fixed at the bottom of the inner cavity of the heating oil inlet (9).

5. The multi-point injection mold for the body of a children's electric vehicle according to claim 4, characterized in that: The lower end of the oil inlet channel (11) is connected to the right end of the spiral heating pipe (13), and the lower end of the oil outlet channel (12) is connected to the left end of the spiral heating pipe (13).

6. The multi-point injection mold for the body of a children's electric vehicle according to claim 5, characterized in that: The turbulence protrusions (14) are spaced apart along the extension direction of the spiral heating pipe (13).

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