An injection molding mold

Abstract

The utility model relates to mould technical field more specifically, relate to a kind of injection moulding mould, including upper die, lower die and cooling mechanism, cooling mechanism is installed at the bottom of lower die, the bottom of upper die is equipped with upper cavity, the top of lower die is equipped with lower cavity with upper cavity intercommunication, upper cavity and lower cavity are spliced into mould cavity, the top of upper die is equipped with injection port, flow channel is equipped in upper die, flow channel one end is communicated with injection port, other end is communicated with upper cavity, injection melt is injected into flow channel by injection port, injection melt is injected into mould cavity by flow channel, cooling mechanism at the bottom of lower die cools mould cavity, rapidly reduce the temperature in mould cavity, accelerate the forming speed of product, shorten stripping time.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and more specifically, to an injection molding mold. Background Technology

[0002] Injection molding technology is widely used in the production of plastic pipe fittings. Especially for products like PPR pipes that require high precision and high quality, the design of injection molds is crucial. However, existing low-flow-resistance injection molds have significant shortcomings in cooling, which directly affects the production efficiency of pipe fittings.

[0003] During injection molding, molten plastic is injected into the mold cavity under high pressure. After a period of cooling and solidification, it forms the desired tubular shape. However, because the heat inside the mold takes time to dissipate, the mold cools slowly, resulting in slow product molding and low production efficiency. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies where slow mold cooling speed leads to slow product molding. It provides an injection molding mold that can improve cooling speed, quickly reduce the temperature inside the mold, accelerate product molding speed, and improve production efficiency.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An injection molding die is provided, comprising an upper die, a lower die, and a cooling mechanism. The cooling mechanism is installed at the bottom of the lower die. A cavity is provided at the junction of the upper die and the lower die. An injection port is provided at the top of the upper die. A flow channel is provided at the junction of the upper die and the lower die. Both the injection port and the cavity are connected to the flow channel.

[0006] The injection molding mold of this utility model injects molten plastic into the runner through the injection port, and the molten plastic is injected into the cavity through the runner. The cooling mechanism located at the bottom of the lower mold cools the mold, quickly reduces the temperature inside the cavity, speeds up the molding speed of the product, and improves production efficiency.

[0007] Furthermore, the cooling mechanism includes an outer cover, an air-cooling device, and a water-cooling device. The outer cover is installed at the bottom of the lower mold, and the air-cooling device and the water-cooling device are installed inside the outer cover. By combining air cooling and water cooling, the cooling effect on the mold is enhanced.

[0008] Furthermore, the water-cooling device includes a water tank, a water supply pipe, a water return pipe, and a cooling pipe. The water tank is installed at the bottom of the outer casing. One end of the water supply pipe is connected to the water tank, and the other end passes through the outer casing and connects to one end of the cooling pipe. One end of the water return pipe passes through the outer casing and connects to the other end of the cooling pipe, and the other end of the water return pipe connects to the water tank. A water pump is installed on the water supply pipe. When the water-cooling device is working, the water pump drives the water in the water tank to flow into the cooling pipe through the water supply pipe. After absorbing the heat from the mold, the water flows back to the water tank through the water return pipe, completing one cooling cycle.

[0009] Furthermore, the water-cooling device also includes heat sinks, with multiple heat sinks installed within the outer casing. The cooling pipe has a continuously bent structure, comprising multiple parallel straight pipe sections and multiple bent sections connecting adjacent straight pipe sections. Each straight pipe section is positioned between two adjacent heat sinks. The heat sinks accelerate heat conduction and increase the heat dissipation area of ​​the mold; the continuous bending of the cooling pipe increases the heat absorption area; and the placement of each straight pipe section between two heat sinks improves the heat absorption efficiency of the cooling pipe and enhances the cooling effect on the mold.

[0010] Furthermore, the air-cooling device is a cooling fan, located below the water-cooling device. The cooling fan causes air to flow upwards rapidly, accelerating the heat dissipation of the mold.

[0011] Furthermore, the outer casing has multiple heat dissipation holes on its side. These holes enhance air exchange between the inside of the casing and the outside environment, thereby improving the cooling effect.

[0012] Furthermore, the upper mold has a positioning hole at its bottom, and the lower mold has a positioning rod at its top that mates with the positioning hole; or the upper mold has a positioning rod at its bottom, and the lower mold has a positioning hole at its top that mates with the positioning rod; the positioning rod is slidably connected to the positioning hole. By engaging with the positioning hole, the positioning rod restricts the direction of relative movement between the upper and lower molds, preventing horizontal relative displacement of the upper and lower molds during mold closing or opening, thus achieving precise mold closing positioning and ensuring the mold's closing accuracy and stability.

[0013] Furthermore, it also includes a telescopic mechanism, one end of which is fixedly connected to the upper mold, and the other end is connected to the lower mold or the cooling mechanism. When the mold is closed, the telescopic mechanism drives the upper mold to move downward until it presses against the lower mold; when the mold is opened, the telescopic mechanism drives the upper mold to move upward and separate from the lower mold.

[0014] Furthermore, the telescopic mechanism includes a telescopic rod, one end of which is fixedly connected to the upper mold, and the other end is fixedly connected to the cooling mechanism. The extension or retraction of the telescopic rod drives the upper mold to move up and down, enabling rapid mold closing and opening, thus simplifying the mold operation process.

[0015] Furthermore, the mold cavity is provided with multiple cavities, and the flow channel includes a main flow channel and multiple branch flow channels. One end of each branch flow channel is connected to the main flow channel, and the other end of each branch flow channel is connected to a multiple mold cavity. After the molten injection material is injected into the main flow channel through the injection port, it flows into the multiple mold cavities through the multiple branch flow channels, allowing multiple products to cool and form simultaneously, thereby improving production efficiency.

[0016] Compared with the prior art, the beneficial effects of this utility model are: The injection molding mold of this utility model has the following features: 1. A cooling mechanism located at the bottom of the lower mold cools the mold, rapidly reducing the temperature inside the cavity, accelerating the molding speed of the product, and improving production efficiency; 2. The cooling effect of the mold is enhanced by combining air cooling and water cooling; 3. The positioning rod, in cooperation with the positioning hole, restricts the direction of relative movement between the upper and lower molds, preventing the horizontal relative position of the upper and lower molds from shifting during mold closing or opening, achieving precise mold closing positioning, and ensuring the mold closing accuracy and stability; 4. The extension or retraction of the telescopic rod drives the upper mold to move up and down, realizing rapid mold closing and opening, and simplifying the mold operation process. Attached Figure Description

[0017] Figure 1 This is a first-view structural schematic diagram of the injection molding mold of this utility model; Figure 2 This is a second-view structural schematic diagram of the injection molding die of this utility model; Figure 3 This is a schematic diagram of the upper mold of the injection molding die of this utility model; Figure 4 This is a schematic diagram of the lower mold of the injection molding die of this utility model; Figure 5 This is a schematic diagram of the cooling mechanism (water tank not shown) of the injection molding mold of this utility model; Figure 6 This is an exploded view of the structure of the water cooling device (water tank not shown) for the injection molding mold of this utility model.

[0018] In the attached diagram: 1. Upper mold; 11. Injection port; 12. Positioning hole; 13. Upper cavity; 14. Core; 2. Lower mold; 21. Runner; 211. Main runner; 212. Sub-runner; 22. Lower cavity; 23. Positioning rod; 3. Cooling mechanism; 31. Water cooling device; 311. Cooling pipe; 3111. Straight pipe section; 3112. Bent section; 312. Heat sink; 313. Heat sink plate; 314. Water tank; 315. Water supply pipe; 316. Water return pipe; 317. Water pump; 32. Air cooling device; 33. Outer cover; 331. Heat dissipation hole; 4. Telescopic mechanism; 41. Telescopic rod; 42. Fixing component; 43. Limiting component. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0020] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0021] Example 1 like Figures 1 to 6 The first embodiment of the injection molding mold of this utility model is shown, including an upper mold 1, a lower mold 2 and a cooling mechanism 3. The cooling mechanism 3 is installed at the bottom of the lower mold 2. A cavity is provided at the junction of the upper mold 1 and the lower mold 2. An injection port 11 is provided at the top of the upper mold 1. A flow channel 21 is provided at the junction of the upper mold 1 and the lower mold 2. The injection port 11 and the cavity are both connected to the flow channel 21.

[0022] The injection molding mold of this utility model injects molten material into the runner 21 through the injection port 11. The molten material is then injected into the cavity through the runner 21. The cooling mechanism 3 located at the bottom of the lower mold 2 cools the mold, quickly reduces the temperature inside the cavity, accelerates the molding speed of the product, and shortens the demolding time.

[0023] In this embodiment, as Figure 3and Figure 4 As shown, the bottom of the upper mold 1 is provided with an upper cavity 13, and the top of the lower mold 2 is provided with a lower cavity 22 that communicates with the upper cavity 13. The upper cavity 13 and the lower cavity 22 are spliced ​​together to form a cavity. A core 14 is provided in the cavity, and the core 14 is fixedly connected to the upper cavity 13 of the upper mold 1. The flow channel 21 is provided on the top of the lower mold 2.

[0024] like Figure 3 and Figure 4 As shown, the upper mold 1 has a positioning hole 12 at its bottom, and the lower mold 2 has a positioning rod 23 at its top that mates with the positioning hole 12; or the upper mold 1 has a positioning rod 23 at its bottom, and the lower mold 2 has a positioning hole 12 at its top that mates with the positioning rod 23; the positioning rod 23 and the positioning hole 12 are slidably connected. The positioning rod 23, by engaging with the positioning hole 12, restricts the direction of relative movement between the upper mold 1 and the lower mold 2, preventing the horizontal relative position of the upper mold 1 and the lower mold 2 from shifting during mold closing or opening, thus achieving precise mold closing positioning and ensuring the mold closing accuracy and stability. In this embodiment, the positioning rod 23 is located at the top of the lower mold 2, and the positioning hole 12 is located at the bottom of the upper mold 1; there are four positioning rods 23 and four positioning holes 12, with the four positioning rods 23 respectively located at the four corners of the top surface of the lower mold 2, and the four positioning holes 12 respectively located at the four corners of the bottom surface of the upper mold 1.

[0025] Both the upper cavity 13 and the lower cavity 22 are provided with multiple flow channels. The flow channel 21 includes a main flow channel 211 and multiple branch flow channels 212. One end of each branch flow channel 212 is connected to the main flow channel 211, and the other end of each branch flow channel 212 is connected to a multiple cavity. After the molten injection material is injected into the main flow channel 211 through the injection port 11, it flows into the multiple cavities through the multiple branch flow channels 212, allowing multiple products to cool and form simultaneously, thus improving production efficiency. In this embodiment, both the upper cavity 13 and the lower cavity 22 are provided with six cavities, and correspondingly, there are also six branch flow channels 212, each connected to one of the six cavities.

[0026] The working principle of the injection molding mold in this embodiment is as follows: Align the positioning holes 12 of the upper mold 1 and the positioning rods 23 of the lower mold 2, and move the upper mold 1 downward until the upper mold 1 presses against the lower mold 2 to complete the mold closing; During the movement, the cores 14 in the six upper cavities 13 are inserted into the six lower cavities 22, and the four positioning rods 23 of the lower mold 2 are respectively inserted into the four positioning holes 12 of the upper mold 1 to prevent the upper mold 1 and the lower mold 2 from shifting horizontally during the mold closing process; The upper mold 1 and the lower mold 2 are closed, and the injection molten material is injected into the main runner 211 through the injection port 11. The injection molten material in the main runner 211 is injected into multiple cavities through multiple branch runners 212. The cooling mechanism 3 located at the bottom of the lower mold 2 cools the mold, quickly reduces the temperature inside the cavity, accelerates the molding speed of the product, and allows multiple products to be cooled and molded in multiple cavities respectively.

[0027] Example 2 This embodiment is the second embodiment of the injection molding mold of this utility model. This embodiment is similar to the first embodiment, except that, as Figure 5 As shown, the cooling mechanism 3 includes an outer cover 33, an air-cooling device 32, and a water-cooling device 31. The outer cover 33 is installed at the bottom of the lower mold 2, and the air-cooling device 32 and the water-cooling device 31 are installed inside the outer cover 33. By combining air cooling and water cooling, the cooling effect on the mold is enhanced.

[0028] like Figure 1 , Figure 2 and Figure 6 As shown, the water-cooling device 31 includes a water tank 314, a water supply pipe 315, a return pipe 316, and a cooling pipe 311. The water tank 314 is installed at the bottom of the outer casing 33. One end of the water supply pipe 315 is connected to the water tank 314, and the other end passes through the outer casing 33 and is connected to one end of the cooling pipe 311. Figure 1 As shown; one end of the return water pipe 316 passes through the outer cover 33 and is connected to the other end of the cooling pipe 311, and the other end of the return water pipe 316 is connected to the water tank 314, as shown. Figure 2 As shown; a water pump 317 is installed on the water supply pipe 315. When the water cooling device 31 is working, the water pump 317 drives the water in the water tank 314 to flow into the cooling pipe 311 through the water supply pipe 315. After absorbing the heat of the mold, the water flows back into the water tank 314 through the return water pipe 316, completing one cooling cycle.

[0029] like Figure 5 and Figure 6 As shown, the water-cooling device 31 also includes heat sinks 312, with multiple heat sinks 312 installed in the outer casing 33. The cooling pipe 311 has a continuously bent structure, comprising multiple parallel straight pipe sections 3111 and multiple bent sections 3112 connecting adjacent straight pipe sections 3111. Each straight pipe section 3111 is positioned between two adjacent heat sinks 312. The heat sinks 312 can accelerate heat conduction and increase the heat dissipation area of ​​the mold; the continuous bending of the cooling pipe 311 can increase the heat absorption area; and the fact that each straight pipe section 3111 of the cooling pipe 311 is positioned between two heat sinks 312 can improve the heat absorption efficiency of the cooling pipe 311 and enhance the cooling effect on the mold. In this embodiment, the heat sinks 312 are made of aluminum alloy, which has excellent heat dissipation performance and corrosion resistance. In this embodiment, the water cooling device 31 also includes a heat sink 313, and a plurality of heat sinks 312 are distributed in parallel on the side of the heat sink 313 facing the cooling pipe 311, with the heat sinks 312 perpendicular to the heat sink 313.

[0030] like Figure 5As shown, the air-cooling device 32 is a cooling fan, located below the water-cooling device 31. The cooling fan causes air to flow upwards rapidly, accelerating the heat dissipation of the mold.

[0031] like Figure 1 , Figure 2 and Figure 5 As shown, the outer casing 33 has multiple heat dissipation holes 331 on its side. The heat dissipation holes 331 enhance the air exchange between the inside of the outer casing 33 and the outside, thereby improving the cooling effect.

[0032] The working principle of the injection molding mold in this embodiment is as follows: The upper mold 1 and the lower mold 2 are closed. Molten plastic is injected into the main runner 211 through the injection port 11. The molten plastic in the main runner 211 is injected into multiple cavities through multiple branch runners 212. The water pump 317 and the cooling fan are turned on. The water pump 317 drives the water in the water tank 314 to flow into the cooling pipe 311 through the water supply pipe 315. After absorbing the heat conducted from the lower mold 2 to the heat sink 312, the water flows back to the water tank 314 through the return water pipe 316, thus cooling the mold. Circulating cooling: The cooling fan generates an upward airflow. Outside air enters the outer casing 33 through the heat dissipation holes 331, mixes with the air inside the outer casing 33, and flows upward to cool the mold. After absorbing the heat conducted by the heat sink 312, part of the airflow enters the outside through the heat dissipation holes 331 on the outer casing 33 to exchange heat with the outside air. The other part absorbs heat from the cooling pipes 311 and mixes with the air entering from the outside to continue cooling the mold, thereby rapidly reducing the temperature inside the cavity and accelerating the product molding speed.

[0033] Example 3 This embodiment is the third embodiment of the injection molding mold of this utility model. This embodiment is similar to embodiment two, except that, as Figure 1 and Figure 2 As shown, it also includes a telescopic mechanism 4, one end of which is fixedly connected to the upper mold 1, and the other end is connected to the lower mold 2 or the cooling mechanism 3. When the mold is closed, the telescopic mechanism 4 drives the upper mold 1 to move downward until it presses against the lower mold 2; when the mold is opened, the telescopic mechanism 4 drives the upper mold 1 to move upward and separate from the lower mold 2.

[0034] The telescopic mechanism 4 includes a telescopic rod 41, one end of which is fixedly connected to the upper mold 1, and the other end is fixedly connected to the cooling mechanism 3. The telescopic rod 41 extends or retracts, causing the upper mold 1 to move up and down, thereby realizing the rapid closing and opening of the mold and simplifying the mold operation process.

[0035] In this embodiment, a fixing member 42 is fixedly provided on the side of the upper mold 1, and a limiting member 43 is fixedly provided on the side of the lower mold 2. One end of the telescopic rod 41 is fixedly installed on the side of the outer cover 33, and the other end passes through the limiting member 43 and is fixedly connected to the fixing member 42. The limiting member 43 can restrict the horizontal position of the telescopic rod 41 and improve the stability of the movement of the telescopic rod 41. The telescopic rod 41 is an electric telescopic rod 41. There are two fixing members 42, two limiting members 43, and two telescopic rods 41. The two fixing members 42 are respectively provided on both sides of the upper mold 1, the two limiting members 43 are respectively provided on both sides of the lower mold 2, and the two telescopic rods 41 are respectively provided on both sides of the outer cover 33. The heat dissipation hole 331 is provided on the side of the outer cover 33 adjacent to the side where the telescopic rod 41 is located.

[0036] The working principle of the injection molding die in this embodiment is as follows: The positioning holes 12 of the upper mold 1 and the positioning rods 23 of the lower mold 2 are aligned. The telescopic rod 41 is shortened, causing the fixing part 42 to move downwards, which in turn causes the upper mold 1 to move downwards until the upper mold 1 presses against the lower mold 2, and the upper mold 1 and lower mold 2 are closed. During the downward movement of the upper mold 1, the cores 14 in the six upper cavities 13 are inserted into the six lower cavities 22, and the four positioning rods 23 of the lower mold 2 are respectively inserted into the four positioning holes 12 of the upper mold 1, preventing the upper mold 1 and lower mold 2 from collapsing during the mold closing process. Horizontal position offset; the injection molten material is injected into the main runner 211 through the injection port 11, and the injection molten material in the main runner 211 is injected into multiple cavities through multiple branch runners 212 respectively; the water cooling device 31 and the air cooling device 32 are activated to cool the mold, quickly reduce the temperature inside the cavity, accelerate the molding speed of the product, and allow multiple products to cool and form in multiple cavities respectively; the telescopic rod 41 is controlled to extend, driving the fixing part 42 to move upward, driving the upper mold 1 to move upward, separating from the lower mold 2, completing the mold opening, and taking out the formed product.

[0037] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0038] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An injection molding die, characterized in that, The system includes an upper mold (1), a lower mold (2), and a cooling mechanism (3). The cooling mechanism (3) is installed at the bottom of the lower mold (2). A cavity is provided at the junction of the upper mold (1) and the lower mold (2). An injection port (11) is provided at the top of the upper mold (1). A flow channel (21) is provided at the junction of the upper mold (1) and the lower mold (2). The injection port (11) and the cavity are both connected to the flow channel (21). The cooling mechanism (3) includes an outer cover (33), an air-cooling device (32), and a water-cooling device (31). The outer cover (33) is installed at the bottom of the lower mold (2). The air-cooling device (32) and the water-cooling device (31) are installed inside the outer cover (33). The water-cooling device (31) includes a water tank (314), a water supply pipe (315), a water return pipe (316), and a cooling pipe (311). The water tank (314) is installed... At the bottom of the outer cover (33), one end of the water supply pipe (315) is connected to the water tank (314), and the other end passes through the outer cover (33) and is connected to one end of the cooling pipe (311). One end of the return water pipe (316) passes through the outer cover (33) and is connected to the other end of the cooling pipe (311). The other end of the return water pipe (316) is connected to the water tank (314). A water pump (317) is installed on the water supply pipe (315). The bottom of the upper mold (1) is provided with a positioning hole (12), and the top of the lower mold (2) is provided with a positioning rod (23) that cooperates with the positioning hole (12). Alternatively, the bottom of the upper mold (1) is provided with a positioning rod (23), and the top of the lower mold (2) is provided with a positioning hole (12) that cooperates with the positioning rod (23). The positioning rod (23) is slidably connected to the positioning hole (12).

2. The injection molding die according to claim 1, characterized in that, The water cooling device (31) also includes heat sinks (312), and multiple heat sinks (312) are installed in the outer cover (33). The cooling pipe (311) has a continuous bending structure. The cooling pipe (311) includes multiple parallel straight pipe sections (3111) and multiple bent sections (3112) connected between adjacent straight pipe sections (3111). Each straight pipe section (3111) is arranged between two adjacent heat sinks (312).

3. The injection molding die according to claim 1, characterized in that, The air-cooling device (32) is a cooling fan, which is located below the water-cooling device (31).

4. The injection molding die according to claim 1, characterized in that, The outer cover (33) has multiple heat dissipation holes (331) on its side.

5. The injection molding die according to claim 1, characterized in that, It also includes a telescopic mechanism (4), one end of which is fixedly connected to the upper mold (1), and the other end is connected to the lower mold (2) or the cooling mechanism (3).

6. The injection molding die according to claim 5, characterized in that, The telescopic mechanism (4) includes a telescopic rod (41), one end of which is fixedly connected to the upper mold (1), and the other end is fixedly connected to the cooling mechanism (3).

7. The injection molding die according to claim 1, characterized in that, The cavity is provided with multiple channels, and the flow channel (21) includes a main flow channel (211) and multiple branch flow channels (212). One end of each branch flow channel (212) is connected to the main flow channel (211), and the other end of each branch flow channel (212) is connected to the multiple cavities respectively.

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