Plastic product mold

Abstract

The utility model relates to the technical field of molds, in particular to a plastic product mold, heat conduction liquid is gasified into a gas state after being heated, the gas-state heat conduction liquid rises to be in contact with a heat conduction column part located in an annular water tank, and heat is transferred to a medium in the annular water tank through heat transfer, so that heat dissipation of a mold body is achieved. The gaseous heat-conducting liquid is condensed into liquid after transferring heat, and the condensed liquid heat-conducting liquid flows back under the action of gravity and continues to absorb the heat of the mold main body due to the fact that the bottom wall of the cavity is provided with the inclined face inclining downwards towards the direction where the mold main body is located. According to the arrangement, heat can be accurately conducted to the annular water tank through the heat conduction columns according to different temperature rising conditions of all parts of the mold, accurate regulation and control over the temperature of all the parts of the mold are achieved, and the problem that the heat dissipation requirements of all the parts cannot be accurately met through a traditional overall adjustment heat dissipation mode is solved. The mold can be widely applied to the technical field of molds.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to a mold for plastic products. Background Technology

[0002] Temperature control is a crucial aspect of plastic product mold operation. Excessive mold temperature prolongs the cooling time of the plastic product and may lead to abnormal shrinkage, resulting in decreased dimensional accuracy. Conversely, excessively low temperatures significantly reduce the fluidity of the plastic material within the mold cavity, easily causing molding defects such as short shots and uneven material flow. Rapid cooling can also generate significant internal stress within the plastic product.

[0003] Currently, existing mold cooling devices on the market typically regulate the overall temperature of the mold. However, in reality, the temperature rise of different parts of the mold varies significantly. For example, the area near the injection port heats up quickly and reaches a high temperature due to the high-speed impact and high-temperature transfer of the molten plastic; while areas farther from the injection port heat up relatively slowly and have lower temperatures. This overall cooling method cannot accurately adapt to the actual cooling needs of different parts of the mold.

[0004] Therefore, developing a mold that can precisely control the temperature based on the different heating conditions of different parts of the mold is of urgent and important practical significance for improving the quality of plastic products, increasing production efficiency, and reducing production costs. Utility Model Content

[0005] In view of the problems existing in the prior art, this utility model proposes a plastic product mold.

[0006] To solve the above-mentioned technical problems, the present invention provides a solution through the following technical method:

[0007] A plastic product mold includes a mold body and an annular water tank disposed on the outside of the mold body. The annular water tank is made of heat-insulating material. Multiple mounting holes are evenly opened on the inner wall of the annular water tank near the mold body. Multiple heat-conducting columns are fixed on the outer wall of the mold body. One end of each heat-conducting column extends into the annular water tank through a corresponding mounting hole. The heat-conducting column has a cavity inside. An inclined surface is provided on the bottom wall of the cavity. The inclined surface slopes downward in the direction of the mold body. The cavity stores heat-conducting liquid that does not completely fill the cavity. The heat-conducting liquid can be vaporized when heated.

[0008] The heat-conducting column has an internal cavity containing a partially filled heat-conducting liquid. When heated, the liquid vaporizes and rises to contact the portion of the heat-conducting column located within an annular water tank. Through heat transfer, it transfers heat to the medium within the annular water tank, thus dissipating heat from the mold body. After transferring heat, the gaseous heat-conducting liquid condenses back into a liquid state. Because the bottom wall of the cavity has a downward-sloping surface towards the mold body, the condensed liquid flows back towards the mold body under gravity, re-engaging with the mold body through the heat-conducting column and continuing to absorb heat from the mold body. This cycle repeats continuously, achieving heat dissipation and cooling for all parts of the mold body.

[0009] The above setup allows for precise heat transfer to the annular water tank via heat-conducting pillars, based on the varying temperatures of different parts of the mold. This enables accurate temperature control of each part of the mold, solving the problem that traditional overall heat dissipation methods cannot precisely adapt to the heat dissipation needs of different parts. Simultaneously, the gas-liquid phase change of the heat-conducting fluid facilitates efficient heat dissipation, quickly removing heat from the main body of the mold, effectively shortening the cooling time of plastic products and significantly improving production efficiency.

[0010] Preferably, the heat-conducting column includes a heat-insulating pipe and a heat-conducting cover. The heat-insulating pipe is fixed on the outer wall of the mold body, one end of the heat-insulating pipe extends into the annular water tank, and the heat-conducting cover is fixed to the end that extends into the annular water tank. Under normal conditions, the heat-conducting liquid does not come into contact with the heat-conducting cover, but comes into contact with the heat-conducting cover after the heat-conducting liquid is heated and vaporized.

[0011] The design of the heat insulation pipe and heat-conducting cover further optimizes the heat transfer path; the heat insulation pipe ensures that the heat of the mold body is concentrated and transferred through the heat-conducting fluid, avoiding excessive heat loss to the surrounding environment during the transfer process and improving heat dissipation efficiency. At the same time, the heat insulation pipe blocks the influence of the low temperature of the annular water tank on the mold body, ensuring a stable temperature field of the mold body, which helps to improve the molding quality of plastic products.

[0012] Under normal conditions, the heat-conducting fluid is located at a lower position inside the heat-insulating pipe and does not contact the heat-conducting cap. When the temperature of the mold body rises, the heat-conducting fluid inside the heat-conducting column vaporizes into a gaseous state. The gaseous heat-conducting fluid moves upward and comes into contact with the heat-conducting cap. Due to the excellent thermal conductivity of the heat-conducting cap, the heat carried by the gaseous heat-conducting fluid is quickly transferred to the heat-conducting cap, and then to the annular water tank, completing the heat transfer process from the mold body to the annular water tank. After releasing heat at the heat-conducting cap, the gaseous heat-conducting fluid condenses into a liquid state and flows back down the inclined surface inside the heat-insulating pipe to the lower part, continuing to absorb the heat transferred from the mold body through the heat-insulating pipe. This cycle achieves continuous heat dissipation.

[0013] Preferably, the heat-conducting cover includes a cover body and a threaded ring, with an external thread on the outer wall of the threaded ring and an internal thread on the inner wall of the heat insulation tube that mates with the external thread.

[0014] The threaded connection greatly simplifies the installation and disassembly of the heat-conducting cover and the heat insulation pipe. During the initial assembly phase of mold production, workers can quickly and accurately install the heat-conducting cover onto the heat insulation pipe, improving equipment assembly efficiency and facilitating the replenishment of heat transfer fluid.

[0015] Preferably, a heat-conducting rod is fixed on the outer wall of the cover, and two heat-conducting rods are provided and symmetrically arranged on both sides of the cover.

[0016] The heat-conducting rod significantly increases the contact area between the heat-conducting cover and the water in the annular water tank, greatly improving the efficiency of heat transfer. The heat-conducting rod also provides a convenient point of leverage for workers to disassemble the heat-conducting cover. During mold maintenance or repair, workers can easily rotate the cover by simply holding the heat-conducting rod, without needing to find additional tools or use complicated operations, thus removing the heat-conducting cover.

[0017] Preferably, a guide groove is provided on the upper surface of the inclined surface, and the guide groove extends along the inclined direction of the inclined surface.

[0018] The flow channel facilitates the rapid convergence of condensed droplets into a stream, greatly shortening the time it takes for the heat transfer fluid to complete one heat dissipation cycle.

[0019] As a preferred embodiment, the annular water tank has an inlet pipe on its bottom wall, a flow regulating valve on the inlet pipe, an outlet pipe on its top wall, and a temperature sensor inside the annular water tank.

[0020] A temperature sensor inside the annular water tank monitors the water temperature in real time. When the sensor detects a rise in water temperature, it indicates an increase in heat transfer from the mold body. At this point, the flow rate can be increased by adjusting the flow control valve on the inlet pipe. More cooler water flows into the annular water tank from the inlet pipe, mixes with the warmer water, and absorbs heat, thus lowering the water temperature inside the tank. The heated water then flows out from the outlet pipe on the top wall, forming a water circulation system that continuously carries away the heat transferred from the mold to the annular water tank through the heat-conducting columns.

[0021] Preferably, the mold body includes a lower mold and an upper mold plate, with an injection tube provided on the upper mold plate and heat-conducting pillars fixed on the side wall of the lower mold.

[0022] Molten plastic is injected into the mold cavity through the injection tube of the upper mold platen. Since the lower mold is in direct contact with the molten plastic during injection, it experiences a significant amount of heat and its temperature rises considerably. Therefore, heat-conducting pillars are fixed to the side wall of the lower mold. These pillars effectively absorb the large amount of heat generated during injection and dissipate it through the gas-liquid phase change of the internal heat-conducting liquid and heat transfer with the annular water tank, thus effectively controlling the temperature of the lower mold. The upper mold platen primarily seals the internal cavity of the lower mold platen. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the mold in the embodiment;

[0024] Figure 2 This is a schematic diagram of the mold body in the embodiment;

[0025] Figure 3 This is an exploded view of the heat-conducting column in the embodiment;

[0026] Figure 4 This is a schematic diagram of the annular water tank in the embodiment;

[0027] Figure 5 This is a cross-sectional view of the heat insulation pipe in the embodiment.

[0028] The names of the parts referred to by the numbers in the attached diagram are as follows:

[0029] 110. Mold body; 1101. Lower mold; 1102. Upper mold plate; 1103. Injection tube; 120. Annular water tank; 1201. Mounting hole; 130. Heat-conducting column; 1301. Cavity; 1302. Angled surface; 1303. Heat insulation tube; 1304. Heat-conducting cover; 1305. Cover body; 1306. Threaded ring; 1307. Heat-conducting rod; 1401. Water inlet pipe; 1402. Water outlet pipe. Detailed Implementation

[0030] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments are merely illustrative of this utility model and are not intended to limit it.

[0031] Example

[0032] like Figures 1-5 As shown, this plastic product mold mainly consists of a mold body 110, an annular water tank 120, and multiple heat-conducting pillars 130. The mold body 110 is divided into a lower mold 1101 and an upper mold plate 1102. The upper mold plate 1102 is equipped with an injection tube 1103 for injecting molten plastic. The upper mold plate 1102 mainly serves to seal the internal cavity of the lower mold 1101. The heat-conducting pillars 130 are fixed to the side wall of the lower mold 1101.

[0033] The annular water tank 120 is made of heat-insulating material and surrounds the outer side of the lower mold 1101. Multiple mounting holes 1201 are evenly distributed on its inner wall near the lower mold 1101. One end of the heat-conducting column 130 extends into the annular water tank 120 through the mounting hole 1201. It has an internal cavity 1301. The bottom wall of the cavity 1301 has a downward-sloping surface 1302 towards the mold body 110. A guide groove extending along the slope direction of the slope 1302 is formed at the upper end of the slope 1302. The cavity 1301 stores partially filled heat-conducting liquid. The heat-conducting column 130 consists of a heat-insulating tube 1303 and a heat-conducting cover 1304. The heat-insulating tube 1303 is fixed to the outer wall of the mold body 110, with one end extending into the annular water tank 120. The heat-conducting cover 1304 is connected to the heat-insulating tube 1303 via a threaded ring 1306. The outer wall of the threaded ring 1306 has external threads that engage with the internal threads on the inner wall of the heat-insulating tube 1303. Heat-conducting rods 1307 are symmetrically fixed on both sides of the cover body 1305 of the heat-conducting cover 1304.

[0034] In addition, the bottom wall of the annular water tank 120 is equipped with an inlet pipe 1401 and a flow regulating valve, and the top wall is equipped with an outlet pipe 1402, with a temperature sensor installed inside.

[0035] Its specific usage process and principle are as follows:

[0036] In the plastic product manufacturing process, molten plastic is injected into the mold cavity through the injection tube 1103 of the upper mold plate 1102. The lower mold 1101 is heated significantly due to direct contact with the molten plastic. The heat-conducting liquid in the heat-conducting column 130 fixed to the side wall of the lower mold 1101 absorbs heat and vaporizes into a gaseous state. The gaseous heat-conducting liquid rises and contacts the heat-conducting cover 1304. Due to the good thermal conductivity of the heat-conducting cover 1304, the heat is transferred to the heat-conducting cover 1304 and then to the water in the annular water tank 120, thus achieving heat dissipation of the mold body 110. After releasing heat at the heat-conducting cover 1304, the gaseous heat-conducting liquid condenses into a liquid state. Under the action of gravity, the liquid heat-conducting liquid quickly converges into a stream along the inclined surface 1302 with guide grooves, flowing back to a position close to the mold body 110, where it absorbs heat from the mold body 110 again. This cycle achieves continuous heat dissipation.

[0037] The heat insulation pipe 1303 ensures that the heat of the mold body 110 is concentrated and transferred through the heat transfer fluid, preventing heat loss, while also blocking the influence of the low temperature of the annular water tank 120 on the mold body 110. The temperature sensor inside the annular water tank 120 monitors the water temperature in real time. When the water temperature rises, it indicates that the heat transferred by the mold body 110 has increased. By adjusting the flow regulating valve of the inlet pipe 1401, the water inflow is increased, and the low-temperature water flows in to mix with the high-temperature water for cooling. The heated water flows out from the outlet pipe 1402, forming a water circulation that carries away heat, thus precisely controlling the heat dissipation rate.

[0038] The above-mentioned design addresses the temperature differences in various parts of the mold, utilizing heat-conducting pillars 130 to achieve precise heat conduction and dissipation control. This overcomes the shortcomings of traditional overall heat dissipation regulation, improving the molding quality of plastic products. The efficient heat dissipation through the gas-liquid phase change of the heat-conducting liquid shortens the cooling time of plastic products and increases production efficiency.

[0039] The heat insulation pipe 1303 and the heat-conducting cover 1304 optimize the heat transfer path and enhance the temperature stability of the mold body 110. The threaded connection of the heat-conducting cover 1304 facilitates installation, disassembly, and maintenance, and also makes it easy to replenish the heat transfer fluid. The heat-conducting rod 1307 increases the heat exchange area, improves heat dissipation efficiency, and at the same time facilitates the disassembly of the heat-conducting cover 1304, reducing maintenance difficulty.

[0040] The guide channel accelerates the return flow of the heat transfer fluid and enhances heat dissipation circulation. The temperature sensor of the annular water tank 120, together with the inlet and outlet water pipes 1402 and the flow regulating valve, realizes intelligent control of water temperature, ensuring that the mold is always within a suitable temperature range, extending the service life of the mold, and reducing production failures and product defects caused by temperature problems.

[0041] In summary, the above are merely preferred embodiments of this embodiment. All equivalent changes and modifications made in accordance with the scope of the patent application of this embodiment shall fall within the scope of the patent of this embodiment.

Claims

1. A plastic article mold comprising a mold body (110), characterized by: The application also comprises a ring-shaped water tank (120) arranged outside the mold body (110), which is made of heat insulation material, and is provided with a plurality of mounting holes (1201) evenly arranged on the inner wall of the mold body (110) near the ring-shaped water tank (120), and a plurality of heat-conducting columns (130) are fixed on the outer wall of the mold body (110), one end of the heat-conducting column (130) extends into the ring-shaped water tank (120) from the corresponding mounting hole (1201), the heat-conducting column (130) is internally provided with a cavity (1301), the bottom wall of the cavity (1301) is provided with an inclined surface (1302) which inclines downward towards the direction of the mold body (110), and the heat-conducting liquid is stored in the cavity (1301) and can be gasified after being heated.

2. A plastic article mold according to claim 1, wherein: The heat-conducting column (130) comprises a heat insulation pipe (1303) and a heat-conducting cover (1304), the heat insulation pipe (1303) is fixed on the outer wall of the mold body (110), one end of the heat insulation pipe (1303) extends into the ring-shaped water tank (120), and the heat-conducting cover (1304) is fixed on the end extending into the ring-shaped water tank (120); and in a natural state, the heat-conducting liquid does not contact the heat-conducting cover (1304), and the heat-conducting liquid contacts the heat-conducting cover (1304) after being heated and gasified.

3. A plastic article mold according to claim 2, wherein: The heat-conducting cover (1304) comprises a cover body (1305) and a threaded ring (1306), the outer wall of the threaded ring (1306) is provided with external threads, and the inner wall of the heat insulation pipe (1303) is provided with internal threads matched with the external threads.

4. A plastic article mold according to claim 3, wherein: The outer wall of the cover body (1305) is fixed with a heat-conducting rod (1307), and the heat-conducting rod (1307) is provided with two heat-conducting rods symmetrically arranged on both sides of the cover body (1305).

5. A plastic article mold according to claim 2, wherein: The upper end surface of the inclined surface (1302) is provided with a flow guide groove extending along the inclined direction of the inclined surface (1302).

6. A plastic article mold according to claim 1, wherein: The bottom wall of the ring-shaped water tank (120) is provided with a water inlet pipe (1401) provided with a flow regulating valve, the top wall of the ring-shaped water tank (120) is provided with a water outlet pipe (1402), and the ring-shaped water tank (120) is provided with a temperature sensor.

7. A plastic article mold according to claim 1, wherein: The mold body (110) comprises a lower mold (1101) and an upper mold plate (1102), the upper mold plate (1102) is provided with an injection molding pipe (1103), and the heat-conducting column (130) is fixed on the side wall of the lower mold (1101).

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